• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a charging system (10) for electric vehicles with a charging station (12) to which a, traction battery of an electric vehicle via a charging cable (13) can be coupled and a power electronics (16). The charging station (12) is connected with the interposition of the power electronics (16) to an electrical power and voltage supply network (14), which provides a defined electrical network performance, connectable. To the charging system (10) further includes an electrical memory (18) connected in such a way between the electrical power and voltage supply network (14) and the charging station (12) that the same depending on the electrical grid power rechargeable and depending on a charging speed of Charging station (12) is dischargeable. Another component is a recooling device (19), which provides a defined thermal recooling power, to which the charging station (12), the power electronics (16) and the electrical memory (18) are connected. The charging system (10) also includes a thermal storage (20) connected to the recooling device (19), the charging station (12), the power electronics (16) and the electrical storage (18), the same or a cooling medium thereof can be heated depending on the loss line of the power electronics (16), the charging station (12) and the electrical accumulator (18) and can be cooled depending on the thermal return cooling performance of the recooling device (19).
    公开号:CH713923A2
    申请号:CH00104/18
    申请日:2018-01-30
    公开日:2018-12-28
    发明作者:Götz Stefan；Gross Manuel
    申请人:Porsche Ag；
    IPC主号:
    专利说明:

    Description [0001] The present invention relates to a charging system for electric vehicles.
    For charging an electric vehicle, namely for charging a traction battery of an electric vehicle, the so-called AC charging mode and the so-called DC charging mode are known.
    In AC charging mode, the electric vehicle is connected via its on-board charger to an electrical power and voltage supply network which provides alternating voltage or alternating current, the on-board charger carrying out the conversion into direct current. In the so-called AC charging mode, the charging speed for the traction battery is limited. Charging times in AC charging mode are several hours per 100 km range.
    Via a DC charging mode, a faster charging of the traction battery of an electric vehicle can take place, the traction battery not being charged via the on-board charger of the electric vehicle in the DC charging mode, but rather in that the traction battery bypassing the on-board -Charger is connected directly to a vehicle-external charging station, which provides direct current for charging the traction battery. With the DC charging mode, higher charging speeds can be achieved in comparison to the AC charging mode, but so far it has not yet been possible in the DC charging mode to provide charging speeds for the traction battery of an electric vehicle that are in the order of magnitude of a refueling process in conventional vehicles powered by internal combustion engines ,
    Hitherto known charging systems for electric vehicles, which serve the DC charging of the traction battery of electric vehicles, have so far not been able to guarantee correspondingly high charging speeds, since on the one hand the electrical network power provided by the available electrical power and voltage supply network may not be sufficient in order to to provide a desired charging speed, and on the other hand taking into account the fact that at high charging speeds there are also high losses which lead to a high level of heat which, however, has hitherto not been able to be dissipated to a sufficient extent.
    [0006] EP 2 572 431 B1 discloses a charging system for electric vehicles with a plurality of charging stations. The traction battery of an electric vehicle can be charged in the area of each charging station, and in the area of each charging station the traction battery of the respective electric vehicle can be coupled to the respective charging station via a charging cable. The charging system of EP 2 572 431 B1 also has power electronics with a plurality of power converters in order to convert the network power provided by an electrical power and voltage supply network for charging the traction battery of the electric vehicles.
    Another charging system for electric vehicles is known from EP 2 986 468 B1. A charging station is disclosed here, to which a traction battery of an electric vehicle can be coupled via a charging cable of the charging station. The traction battery of the electric vehicle can be cooled via a heat sink provided by the charging station, specifically in that the cooling body of the charging station thermally contacts a contacting surface of the traction battery.
    There is therefore a need for a charging system for electric vehicles, which on the one hand from an electrical point of view and on the other hand from a thermal point of view allows charging of the electric vehicles with a high charging speed or with a charging power, in particular of more than 300 kW per vehicle.
    [0009] This object is achieved by a charging system for electric vehicles according to claim 1.
    The charging system comprises at least one electrical memory which is connected between the electrical power and voltage supply network and the respective charging station in such a way that it can be charged depending on the electrical network power of the electrical current and voltage supply network and depending on a charging speed of the power electronics and the respective charging station is unloadable.
    The charging system further comprises at least one recooling device, the respective charging station, the power electronics and the or each electrical storage device being connected to the recooling device, which provides a defined thermal recooling capacity.
    The charging system further comprises at least one thermal storage device, which is connected to the recooling device, the respective charging station, the power electronics and the or each electrical storage device in such a way that the same or a cooling medium depends on the loss line of the power electronics, the respective charging station and the The respective electrical storage device can be heated and cooled depending on the thermal cooling capacity of the cooling device.
    [0013] The charging system according to the invention comprises at least one electrical storage device and at least one thermal storage device.
    The or each electrical storage device can be connected to an electrical power and voltage supply network and charged by the same, with a charging speed which is dependent on the electrical network power of the electrical power and voltage supply network. To charge a traction battery of a motor vehicle, the electrical energy stored in the electrical store can be called up in order to charge the traction battery starting from the electrical energy store, preferably supported by the electrical current and voltage supply network, at a higher speed than charging the electrical energy store based on the electrical current and Power supply network is possible.
    CH 713 923 A2 In particular, an electrical energy store makes it possible to provide a charging power of more than 300 kW per vehicle. This enables high charging speeds to be achieved.
    The waste heat generated at such high charging capacities for electric vehicles can be dissipated via the or each thermal storage device in order to prevent inadmissibly high heating, for example of the power electronics or the respective charging station or the respective electrical storage device.
    The dissipation of the heat absorbed by the thermal storage then takes place via the recooling device, which provides a recooling capacity in order to cool the thermal storage or cooling medium used by the thermal storage.
    According to an advantageous development, the or each electrical storage device and the or each thermal storage device are matched to one another with regard to their respective dynamics. The coordination of electrical storage and thermal storage with regard to their dynamics is particularly preferred for providing an efficient charging system for electric vehicles. It is possible to charge several electric vehicles with sufficient charging speed.
    The thermal recooling capacity of the or each thermal store is preferably adapted to the electrical network performance of the power and voltage supply network in such a way that, on the one hand, the electrical store is recharged and the thermal store is recooled after a traction battery of an electric vehicle has been charged within a defined period of time , An efficient charging system for electric vehicles can hereby be provided particularly advantageously. It is possible to charge several electric vehicles with sufficient charging speed.
    The or each electrical store and the or each thermal store are preferably matched to one another with regard to their respective capacities.
    For this purpose, an electrical capacity of the or each electrical storage and a thermal capacity of the or each thermal storage are preferably coordinated with one another in such a way that the electrical storage provides the required charging energy and the thermal storage provides the required cooling energy for a defined number of charging processes of traction batteries ,
    The coordination of the capacities of electrical storage and thermal storage is of particular advantage for providing an efficient charging system. It is possible to charge several electric vehicles with sufficient charging speed.
    Preferably, the electrical capacity of the or each electrical storage device is further designed while maximizing the service life of the electrical storage device and / or taking into account a network stability of the electrical power and voltage supply network. Taking these boundary conditions into account, the efficiency of the charging system can be further increased.
    Preferably, the thermal capacity of the or each thermal store of the charging system is further designed depending on the ambient temperature influences of the charging system. Even taking this boundary condition into account, a further increase in efficiency of the charging system is possible, since it is possible to minimize the recooling capacity of the recooling device that is to be maintained.
    Preferably, the electrical capacity of the or each electrical storage device of the charging system and the thermal capacity of the or each thermal storage device of the charging system and the thermal cooling capacity of the cooling device of the charging system are based on an empirically or statistically determined number of charging processes per unit of time and on an empirical or Statistically determined charging energy designed for each charging process. This makes it possible to design a charging system specifically for site-specific requirements. This enables an efficient and economical charging system to be provided.
    According to an advantageous development, the or each electrical storage device of the charging system and the or each thermal storage device of the charging system are coordinated with one another in such a way that a thermal energy content of the thermal storage device, which corresponds to a product of a thermal capacity and a maximum permissible temperature rise, for the same number of charging processes is sufficient as the electrical storage can operate due to its electrical energy content. These details serve to provide an efficient charging system on which a large number of electric vehicles can be charged at a high charging speed.
    According to an advantageous development, the power electronics and the or each electrical energy store and the charging cable of the or each charging station can be cooled with the aid of the recooling device. In particular, the cooling of the charging cables of the charging stations is important in order to effectively dissipate the heat lost at high charging capacities or charging speeds and to prevent the charging cables from overheating.
    Preferred developments of the invention result from the subclaims and the following description. Exemplary embodiments of the invention are explained in more detail with reference to the drawing, without being restricted to this. It shows:
    Figure 1 is a schematic representation of an inventive charging system for electric vehicles.
    CH 713 923 A2
    FIG. 2 shows a diagram to clarify design details of the charging system of FIG. 1;
    Figure 3 shows a detail of the loading system of Figure 1; and
    4 shows an alternative detail of the loading system of FIG. 1.
    [0029] The invention relates to a charging system for electric vehicles. Such a charging system is also referred to as a charging park.
    1 shows the basic structure of an inventive charging system 10 for electric vehicles 11 in a highly schematic manner. The charging system 10 has a plurality of charging stations 12 for electric vehicles, an electric vehicle 11 in the area of each of these charging stations 12, which are also referred to as charging stations can be charged, namely by coupling the traction battery of the electric vehicle 11 to the charging station 12 via a charging cable of the respective charging station 12.
    In Fig. 1, two electric vehicles 11 are shown, which are connected via a charging cable 13 to the respective charging station 12.
    The charging system 10 can be supplied with electrical voltage or electrical current, starting from an electrical current and voltage supply network 14, of which a transformer 15 is shown. The electrical current and voltage supply network 14 is characterized by a defined electrical network power, which is predefined as a boundary condition depending on the location.
    In previously known charging systems, the charging speed or charging power for the electric vehicles 11 depends to a limited extent on the electrical network power of the electrical current and voltage supply network 14.
    The charging system 10 for electric vehicles also has power electronics 16, which are provided in the exemplary embodiment shown in FIG. 1 by two power electronics modules 17, which hold a power converter for each charging station 12.
    Each charging station 12 of the charging system 10 can be connected or coupled to the electrical current and voltage supply network with the interposition of the power electronics 16 or the power converter provided by the power electronics 16.
    [0036] The charging system 10 for electric vehicles has at least one electrical storage device 18.
    The respective electrical storage 18 of the charging system 10 is connected between the electrical current and voltage supply network 14 and the respective charging station 12 of the charging system 10 and thus the power electronics 16 of the charging system 10 that the respective electrical energy store 18 is dependent on the electrical network power of the electrical power and voltage supply network 14 can be charged and, depending on a charging speed of the power electronics 16 or the respective charging station 12, can be discharged when the traction battery of an electric vehicle is charging.
    The charging speed at which the electrical energy storage device 18 can be charged starting from the electrical power and voltage supply network 14 is limited by the electrical network power and is lower than the charging speed of the respective charging station 12 for charging the traction battery of an electric vehicle, so as to enable this that electric vehicles 11, namely traction batteries of the same, can be charged at a high charging speed and high charging power than would be possible exclusively via the power and voltage supply network 14, the charging power per vehicle preferably being more than 300 kW.
    The charging system 10 also has a recooling device 19 and at least one thermal store 20.
    The recooling device 19 provides a defined thermal recooling capacity for cooling the respective charging station 12 and the power electronics 16 and the electrical store 18.
    In order not to limit the heat that can be dissipated in the area of the charging stations 12, the power electronics 16 and the electrical energy store 18 by the thermal recooling power of the recooling device 19, the charging system 10 further comprises at least one thermal store 20.
    The thermal storage 20 is coupled to the recooling device 19, the respective charging station 12, the power electronics 16 and the respective electrical energy storage 18, so that the thermal storage 20 or a cooling medium thereof depending on the power loss of the power electronics 16, the power loss of the Charging stations 12 and the power loss of the electrical energy store 18 can be heated and can be cooled depending on the thermal cooling capacity of the cooling device 19.
    In the exemplary embodiment shown, a common electrical store 18 and a common thermal store 20 are present for all charging stations 12. It is also possible to provide a plurality of electrical storage devices 18 and a plurality of thermal storage devices 20, for example a common electrical storage device and a common thermal storage device 20 for each group of charging stations 12.
    CH 713 923 A2 [0044] The or each electrical store 18 accordingly makes it possible to compensate for a network power of the electrical power and voltage supply network 14 that is sometimes too low at times. In this case, the electrical storage 18 is charged relatively slowly, starting from the electrical current and voltage network 14, and is rapidly discharged as soon as an electric vehicle, namely the traction battery of an electric vehicle, is charged at a charging station 12. The electrical current and voltage network 14 preferably supports the electrical storage 18 when discharging a traction battery of an electric vehicle.
    With the aid of the thermal store 20, it is possible to reduce a recooling capacity to be provided by the recooling system 19, in order to make the recooling system 19 smaller and to reduce costs in this regard.
    According to an advantageous development, the or each electrical store 18 and the or each thermal store 20 are matched to one another with regard to their respective dynamics and / or with regard to their respective capacities. Both the dynamics and the capacities and thus the storage capacity of the or each electrical store 18 and of the or each thermal store 20 are preferably matched to one another. This makes it possible, in particular, to match the thermal cooling capacity to be made available to the electrical charging capacity provided. The or each electrical store 18 provides electrical energy for charging processes of traction batteries of electric vehicles 11, optionally supported by the electrical current and voltage network. The or each thermal store 20, supported by the recooling system 19, serves to absorb and dissipate heat that is generated during charging.
    It is preferably provided that the thermal recooling power which is provided to the recooling device 19 for the or each thermal store 20 is adapted to the electrical network power of the electrical power and voltage supply network which serves to charge the or each electrical store 18 is that, on the one hand, the electrical energy store 18 is charged and, on the other hand, the thermal store 20 is cooled back after a traction battery of an electric vehicle 11 has been charged within a defined period of time. This is preferred for matching the charging dynamics and cooling dynamics of the charging system.
    It is particularly provided that, on the one hand, the charging of the electrical store 18 and, on the other hand, the cooling of the thermal store 20 after the charging process of a traction battery of an electric vehicle 11 takes place at the same speed. This is particularly preferred for matching the charging dynamics and cooling dynamics of the charging system.
    Furthermore, the capacities of the memories 18, 19 are matched to one another, namely the electrical capacity of the or each electrical memory 18 and the thermal capacity of the or each thermal memory 20.
    Preferably, the electrical capacity of the or each electrical storage 18 and the thermal capacity of the or each thermal storage 20 is coordinated such that for a defined number of charging processes of traction batteries of electric vehicles 11, the or each electrical storage 18, the required charging energy and the or each thermal store 20 provides the required cooling energy.
    It is particularly preferably provided that the electrical capacity of the or each electrical store 18 and the thermal capacity of the or each thermal store 20 and the thermal recooling capacity of the recooling device 19 to an empirically or statistically determined number of charging processes per unit of time and to an empirical or statistically determined charging energy per charging process are designed to optimally design the degrees of freedom of the charging system, specifically the size or capacity of the or each electrical storage device 18, the size or capacity of the or each thermal storage device 20, depending on the location of the charging system and location-specific boundary conditions and the recooling capacity of the recooling device 19.
    The electrical network power of the electrical current and voltage supply network 14 is predetermined and must be observed as a boundary condition. Furthermore, as a boundary condition to be observed in the design, as stated above, the statistically or empirically determined number of charging processes per unit of time, i.e. an empirically or statistically determined charging frequency, a statistically or empirically determined requested charging energy per charging process, the number of charging points of the charging system and the desired or specified charging power per charging process and a predetermined waiting time that is acceptable between charging processes.
    2, the coordinated design of the degrees of freedom of the charging system is visualized in a highly schematic manner over time t, namely the design of the capacities of the memories 18, 19 and the recooling capacity of the recooling device. Thus, the curve shape 21 of FIG. 2 visualizes an electrical charge state of an electrical storage device 18 and the curve shape 22 a thermal absorption capacity of the thermal storage device 20.
    The phases 23 of FIG. 2 visualize the course of the state of charge 21 and the thermal absorption capacity 22 during a charging process of a traction battery. The phases 24 of FIG. 2 visualize the state of charge 21 and the thermal absorption capacity 22 during a recovery of the memories 18, 20 after a traction battery has been charged. In phase 25 of FIG. 2, the state of charge 21 of the electrical store 18 and the thermal absorption capacity 22 of the thermal store 20 are visualized for a situation in which neither a charging process nor a recovery of the stores 18, 20 is necessary, in which case the electrical storage 18 is fully charged again and the full thermal absorption capacity of the thermal storage 20 is available.
    CH 713 923 A2 The electrical power of the charging system is at least adjusted on average over time to the power that is called when charging traction batteries from electric vehicles. The recooling capacity of the recooling device 19 is designed such that the waste heat generated when charging traction batteries from electric vehicles is dissipated on average over time. The memories 18 and 20 permit an extension of the time period over which the averaging takes place.
    When designing the capacity of the electrical store 18, a maximization of the service life of the electrical store 18 is preferably taken into account, namely in that a charge and discharge stroke of the electrical store 18 is kept within defined limits. Furthermore, a network stability of the electrical power and voltage supply network 14 is preferably taken into account when designing the electrical memory 18.
    If there is a high probability of failure for the electrical power and voltage supply network 14 due to the location, the electrical capacity of the electrical memory 18 is designed for this. Furthermore, when determining the capacity of the electrical store 18, not only the stability of the power and voltage supply network 14 can be taken into account, but also an energy that can be provided by the power and voltage supply network 14 as a result of other boundary conditions, which depends on the time of day, the season, the day of the week, may depend on changing energy costs and the like. Relevant data can be determined empirically and taken into account in the design using a Poisson or log normal distribution.
    When determining the thermal capacity of the thermal store 20, environmental conditions of the charging system can be taken into account, such as ambient temperatures prevailing on site in the area of the charging system.
    3 shows a detail of the charging system 10 in the area of a thermal store 20, which interacts with a recooling device 19. 3 shows the thermal store 20, in which a coolant is kept ready, the coolant being removed from the store 20 via a pump 26 for cooling an assembly 27 to be cooled, via a feed line 28, in the direction of the assembly 27 to be cooled to be guided, and wherein the coolant after cooling of the assembly 27 is returned via a return line 29 in the direction of the thermal storage 20 and is led beforehand via the recooling device 19 built into the return line 29, which in the exemplary embodiment in FIG. 3 has a heat exchanger 30 comprises, which cooperates with a fan 31.
    The amount of air which is guided for cooling via the heat exchanger 30 is defined via the fan 31 in FIG. 3 in order to cool the heated coolant which is guided via the return line 29 before being fed into the thermal store 20. The assembly 27 can be an assembly of the power electronics 16, the electrical storage 18 or a charging station 12. As already stated, all of the assemblies to which waste heat is generated are cooled, that is to say both assemblies of the power electronics 16, assemblies of the electrical store 18 and assemblies of the charging stations 12, in particular the charging cables 13 thereof.
    FIG. 4 shows a further development of the detail from FIG. 3, in which, in addition to the heat exchanger 30 and fan 31, an air conditioning compressor 32 is present as a further assembly of a recooling device 19. In contrast to FIG. 3, the coolant can then be cooled below the ambient temperature via such an air conditioning compressor 32. Under certain circumstances, it is possible to do without the heat exchanger 30 and fan 31 when using an air conditioning compressor 32. If the recooling device 19 uses both the heat exchanger 30 and the air conditioning compressor 32 and the temperature of the coolant in the return 29 is below the ambient temperature, the fan can then be switched off. If, on the other hand, the return temperature of the coolant in the return 29 is above the ambient temperature, the fan 31 can be switched on in order to cool the coolant already in the area of the heat exchanger 30 and then to ensure further cooling below the ambient temperature via the air conditioning compressor.
    权利要求:
    Claims (14)
    [1]
    claims
    1. Charging system (10) for electric vehicles, with at least one charging station (12), to which a traction battery of an electric vehicle can be coupled via a charging cable (13) of the respective charging station (12), with power electronics (16), the respective charging station ( 12) with the interposition of the power electronics (16) to an electrical current and voltage supply network (14), which provides a defined electrical network power, can be connected, characterized by at least one electrical memory (18), which is thus connected between the electrical current and voltage supply network ( 14) and the respective charging station (12) is switched such that it can be charged depending on the electrical network power of the electrical power and voltage supply network (14) and can be discharged depending on a charging speed of the power electronics (16) and the respective charging station (12) Recooling device (19), the respective charging station (12), the Power electronics (16) and the or each electrical memory (18) are connected to the recooling device (19), which provides a defined thermal recooling capacity,
    CH 713 923 A2 at least one thermal store (20) which is connected to the recooling device (19), the respective charging station (12), the power electronics (16) and the or each electrical store (18) in such a way that the same or a cooling medium the same can be heated depending on the loss line of the power electronics (16), the respective charging station (12) and the respective electrical store (18) and can be cooled depending on the thermal cooling capacity of the cooling device (19).
    [2]
    2. Charging system according to claim 1, characterized in that the or each electrical storage device (18) and the or each thermal storage device (20) are matched to one another with regard to their respective dynamics.
    [3]
    3. Charging system according to claim 1 or 2, characterized in that the thermal recooling capacity of the recooling device (19) for the or each thermal store (20) is adapted to the electrical network capacity of the electrical power and voltage supply network (14) such that, on the one hand, the The electrical storage device (18) is charged and the thermal storage device (19) is cooled down after a traction battery of an electric vehicle has been charged within a defined period of time.
    [4]
    4. Charging system according to claim 3, characterized in that on the one hand the charging of the electrical store (18) and the cooling of the thermal store (20) takes place after a charging process of a traction battery of an electric vehicle at the same speed.
    [5]
    5. Charging system according to one of claims 1 to 4, characterized in that the or each electrical storage device (18) and the or each thermal storage device (19) are matched to one another with regard to their respective capacities.
    [6]
    6. Charging system according to one of claims 1 to 5, characterized in that an electrical capacity of the or each electrical storage device (18) and a thermal capacity of the or each thermal storage device (20) are matched to one another in such a way that for a defined number of charging processes of traction batteries the electrical storage provides the required charging energy and the thermal storage provides the required cooling energy.
    [7]
    7. Charging system according to claim 5 or 6, characterized in that the electrical capacity of the or each electrical storage device (18) is further designed while maximizing the life of the electrical storage device (18).
    [8]
    8. Charging system according to one of claims 5 to 7, characterized in that the electrical capacity of the or each electrical memory (18) is further designed taking into account a network stability of the electrical power and voltage supply network (14).
    [9]
    9. Charging system according to one of claims 5 to 8, characterized in that the thermal capacity of the or each thermal store (20) is further designed as a function of ambient temperature influences of the charging system.
    [10]
    10. Charging system according to one of claims 1 to 9, characterized in that the electrical capacity of the or each electrical store (18) and the thermal capacity of the or each thermal store (20) and the thermal recooling capacity of the recooling device to an empirically or statistically determined Number of charging processes per unit of time and are designed for an empirically or statistically determined charging energy per charging process.
    [11]
    11. Charging system according to one of claims 1 to 10, characterized in that the or each electrical store (18) and the or each thermal store (20) are matched to one another such that a thermal energy content of the thermal store (20), the one Corresponds to the product of a thermal capacity and a maximum permissible temperature rise, for the same number of charging processes as the electrical store (18) can operate due to its electrical energy content.
    [12]
    12. Loading system according to one of claims 1 to 11, characterized in that a coolant, which the or each thermal store (20) holds ready for recooling, can be recooled via a heat exchanger (30), which leads into a return line leading to the thermal store (20) (29) is integrated, and to which a fan (31) is preferably assigned.
    [13]
    13. Charging system according to one of claims 1 to 12, characterized in that a coolant, which the or each thermal store (20) holds ready for recooling, can be recooled via an air conditioning compressor (32).
    [14]
    14. Charging system according to one of claims 1 to 13, characterized in that with the help of the recooling device (19) and the or each thermal store (20), the power electronics (16) and the or each electrical energy store (18) and the charging cable (13 ) the or each charging station (12) can be cooled.
    CH713 B! 3A!
    CH 713 923 A2
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    US20180370374A1|2018-12-27|
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    JP2019009111A|2019-01-17|
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    申请号 | 申请日 | 专利标题
    DE102017113842.0A|DE102017113842A1|2017-06-22|2017-06-22|Charging system for electric vehicles|
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