Charging method

Abstract

Provided in the embodiments of the present application are a charging method. The charging method comprises: determining a connection state between an electric vehicle and a charging device, and a connection state between the electric vehicle and an out-of-vehicle liquid cooling device; and on the basis that the electric vehicle has been connected to the charging device and that the electric vehicle has been connected to the out-of-vehicle liquid cooling device, sending an overcharging request message to the charging device, wherein the overcharging request message is used for instructing the charging device to charge the electric vehicle at a first output power, and the first output power is greater than or equal to a preset power. In the charging method provided in the embodiments of the present application, when the charging device performs high-power charging on the electric vehicle, the out-of-vehicle liquid cooling device can cool the electric vehicle by means of delivering a liquid-phase cooling medium to the electric vehicle, which is conducive to meeting a heat dissipation requirement of a traction battery of the electric vehicle during high-power charging, so that high-power charging can be performed on the electric vehicle, thereby reducing the charging duration of the electric vehicle.

Description

A charging method

[0001] This application claims priority to the Chinese patent application with application number 202311291653.5 filed with the State Intellectual Property Office of China on September 30, 2023, and priority to the Chinese patent application with the invention name “A Charging Method”, all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of charging technology, and more particularly, to a charging method. Background Art

[0003] Breakthroughs in high-power battery charging technology have made it possible to fully charge batteries in a short period of time. However, in current applications, when charging a power battery at high power, the heat generated by the battery increases significantly. If this heat cannot be removed in a timely manner, the charging device will not be able to charge the power battery properly.

[0004] Electric vehicles typically have a built-in thermal management system that provides the necessary cooling for the power battery. However, as charging power increases, the heat generated by the power battery increases. Relying solely on the thermal management system for heat dissipation is very limited. The thermal management system's heat dissipation capacity can no longer meet the power battery's heat dissipation requirements during high-power charging.

[0005] Summary of the Invention

[0006] The present application provides a charging method, which can enable the charging equipment to charge the electric vehicle at high power while the external liquid cooling equipment cools the electric vehicle by transmitting liquid cooling medium to the electric vehicle, which is beneficial to meeting the heat dissipation requirements of the power battery of the electric vehicle during high-power charging, allowing the electric vehicle to be charged at high power and reducing the charging time of the electric vehicle.

[0007] In a first aspect, a charging method is provided, which can be performed using an onboard charging connection device provided in an electric vehicle. The charging device outputs direct current (DC) to a power battery in the electric vehicle via the onboard charging connection device, and an off-board liquid cooling device transmits a liquid cooling medium to a thermal management system of the power battery in the electric vehicle via the onboard charging connection device.

[0008] The charging method includes: determining the connection status between the electric vehicle and the charging device, and the connection status between the electric vehicle and the external liquid cooling device; and sending a supercharge request message to the charging device based on the electric vehicle and the charging device being connected, and the electric vehicle and the external liquid cooling device being connected, the supercharge request message being used to instruct the charging device to charge the electric vehicle with a first output power, where the first output power is greater than or equal to a preset power.

[0009] It can be understood that in the embodiment of the present application, when the charging device outputs direct current to the electric vehicle at a first output power greater than or equal to a preset power, it can be referred to as the charging device supercharging the electric vehicle; when the charging device outputs direct current to the electric vehicle at an output power less than the preset power, it can be referred to as the charging device fast charging the electric vehicle.

[0010] In an embodiment of the present application, when the electric vehicle, the charging device and the external liquid cooling device are all connected, the on-board charging connection device sends a supercharge request message to the charging device requesting the charging device to charge the electric vehicle at a higher power, so that the charging device can use the external liquid cooling device to transmit liquid cooling medium to the electric vehicle while charging the electric vehicle at high power, so as to meet the heat dissipation requirements of the power battery of the electric vehicle during high-power charging, which is conducive to the charging device to realize high-power charging of the electric vehicle.

[0011] In combination with the first aspect, in certain implementations of the first aspect, sending a supercharge request message to a charging device includes: receiving a charging request message and a temperature request message sent by a vehicle controller of an electric vehicle, the charging request message being used to instruct the charging device to charge the electric vehicle at a first output power, and the temperature request message being used to indicate temperature requirement information of the electric vehicle; receiving an authentication message sent by the charging device; and sending a supercharge request message to the charging device based on the indication in the authentication message that the charging device has the function of outputting a power greater than or equal to a preset power.

[0012] It is understood that, if it is determined that the electric vehicle is connected to both the charging device and the off-board liquid cooling device, the on-board charging connection device may send a second connection status indication message to the vehicle controller of the electric vehicle. The second connection status indication message is used to indicate that the electric vehicle is connected to the charging device and the off-board liquid cooling device. Based on the second connection status indication message, the vehicle controller may send the aforementioned charging request message and the aforementioned temperature request message to the on-board charging connection device.

[0013] In an embodiment of the present application, when the charging request message sent by the vehicle controller indicates that the charging power required for charging the power battery in the electric vehicle is high, for example, when the required power is a supercharging power greater than a preset power, the on-board charging connection device can first be based on the authentication message sent by the charging device. When it is determined that the charging device has an output power greater than or equal to the preset power to output direct current to the power battery of the electric vehicle, that is, when the charging device has a supercharging function, the higher charging power required for charging the power battery is sent to the charging device through a supercharging request message, which is conducive to ensuring that the charging device can charge the power battery with high power.

[0014] In combination with the first aspect, in certain implementations of the first aspect, based on the indication in the authentication message that the charging device has the function of outputting power greater than or equal to the preset power, a supercharge request message is sent to the charging device, including: based on the indication in the authentication message that the charging device has the function of outputting power greater than or equal to the preset power, a temperature request message is sent to the external liquid cooling device; based on the information that the liquid cooling medium transmitted by the external liquid cooling device meets the temperature requirement of the electric vehicle, a supercharge request message is sent to the charging device.

[0015] In an embodiment of the present application, the on-board charging connection device can, when the electric vehicle is connected to the charging device and the off-board liquid cooling device, first send a temperature request message to the off-board liquid cooling device, causing the off-board liquid cooling device to first transmit liquid-phase cooling medium to the electric vehicle. After the transmitted liquid-phase cooling medium meets the temperature requirements of the electric vehicle, it then sends a supercharge request message to the charging device, causing the charging device to perform high-power charging of the electric vehicle. This helps further ensure that the liquid-phase cooling medium transmitted by the off-board liquid cooling device meets the heat dissipation requirements of the power battery during high-power charging, facilitating the charging device's high-power charging of the electric vehicle.

[0016] In combination with the first aspect, in certain implementations of the first aspect, the electric vehicle includes a vehicle-side charging connection confirmation CC interface and a vehicle-side cooling CC interface, and judges the connection status between the electric vehicle and the charging device, as well as the connection status between the electric vehicle and the external liquid cooling device, including: detecting the voltage signal of the vehicle-side charging CC interface, and judging the connection status between the electric vehicle and the charging device based on the voltage signal of the vehicle-side charging CC interface; detecting the voltage signal of the vehicle-side cooling CC interface, and judging the connection status between the electric vehicle and the external liquid cooling device based on the voltage signal of the vehicle-side cooling CC interface.

[0017] In the embodiment of the present application, by providing a vehicle-side charging CC interface and a vehicle-side cooling CC interface, the on-board charging connection device can determine the connection status between the electric vehicle and the charging device, as well as the electric vehicle and the external liquid cooling device, based on the voltage signals from the vehicle-side charging CC interface and the vehicle-side cooling CC interface. In this way, when the electric vehicle and the charging device are connected and the electric vehicle and the external liquid cooling device are connected, the on-board charging connection device can transmit the high-power DC power output of the charging device to the electric vehicle, and simultaneously transmit the liquid cooling medium transmitted by the external liquid cooling device to the electric vehicle to cool the electric vehicle. This helps meet the heat dissipation requirements of the power battery during high-power charging and facilitates the charging device to achieve high-power charging of the electric vehicle.

[0018] In combination with the first aspect, in certain implementations of the first aspect, the charging method further includes: controlling the conduction of the power transmission circuit between the electric vehicle and the charging device based on the fact that the electric vehicle is connected to the charging device and that the electric vehicle is connected to an external liquid cooling device; and sending a power limit request message to the charging device based on the temperature of the power transmission circuit being greater than a preset temperature, the power limit request message being used to instruct the charging device to reduce the output power.

[0019] In an embodiment of the present application, the on-board charging connection device can request the charging equipment to reduce the charging power when the temperature of the monitored power transmission circuit is abnormal, which is conducive to ensuring that the charging equipment can charge the electric vehicle normally.

[0020] In a second aspect, a charging method is provided. The charging method can be performed by a pile-end controller in a charging pile. The pile-end controller can include a pile-end charging controller in a charging device and a pile-end cooling controller in a liquid cooling device. In one example, the pile-end cooling controller can be integrated into the pile-end charging controller.

[0021] The charging method includes: receiving a supercharge request message sent by the electric vehicle based on whether the charging device in the charging pile is connected to the electric vehicle and whether the liquid cooling device in the charging pile is connected to the electric vehicle, wherein the supercharge request message is used to instruct the charging device to charge the electric vehicle with a first output power, and the first output power is greater than or equal to a preset power; and controlling the charging device to charge the electric vehicle with the first output power.

[0022] In combination with the second aspect, in certain implementations of the second aspect, receiving a supercharging request message sent by an electric vehicle includes: when an authentication message is sent to the electric vehicle, the authentication message is used to indicate that the charging device has the function of outputting power greater than or equal to a preset power; receiving a temperature request message sent by the electric vehicle, the temperature request message is used to indicate the temperature requirement information of the electric vehicle; and controlling the liquid cooling device to transmit liquid-phase cooling medium to the electric vehicle according to the temperature requirement information of the electric vehicle.

[0023] In combination with the second aspect, in certain implementations of the second aspect, the charging device includes a pile-end charging connection confirmation CC interface, the liquid cooling device includes a pile-end cooling CC interface, and the charging method further includes: detecting the voltage signal of the pile-end charging CC interface, and judging the connection status of the charging device and the electric vehicle based on the voltage signal of the pile-end charging CC interface; detecting the voltage signal of the pile-end cooling CC interface, and judging the connection status of the liquid cooling device and the electric vehicle based on the voltage signal of the pile-end cooling CC interface.

[0024] In combination with the second aspect, in certain implementations of the second aspect, the charging method further includes: receiving a power limit request message sent by the electric vehicle, the power limit request message being used to instruct the charging device to reduce output power; and controlling the charging device to reduce output power.

[0025] In a third aspect, a charging method is provided, which includes: an on-board charging connection device and a charging pile each respectively determining the connection status between the electric vehicle and the charging equipment in the charging pile, and the connection status between the electric vehicle and the liquid cooling equipment in the charging pile; based on the electric vehicle and the charging equipment being connected, and the electric vehicle and the liquid cooling equipment being connected, the on-board charging connection device sends a supercharge request message to the charging pile, the supercharge request message being used to instruct the charging equipment to charge the electric vehicle with a first output power, the first output power being greater than or equal to a preset power; the charging pile controls the charging equipment to charge the electric vehicle with the first output power.

[0026] In combination with the third aspect, in certain implementations of the third aspect, the on-board charging connection device sends a supercharging request message to the charging pile, including: the on-board charging connection device receives a charging request message and a temperature request message sent by the vehicle controller of the electric vehicle, the charging request message is used to instruct the charging device to charge the electric vehicle at a first output power, and the temperature request message is used to indicate the temperature requirement information of the electric vehicle; the on-board charging connection device receives an authentication message sent by the charging pile; the on-board charging connection device sends a supercharging request message to the charging pile based on the charging device indicated by the authentication message having a function of outputting a power greater than or equal to a preset power.

[0027] In combination with the third aspect, in certain implementations of the third aspect, the on-board charging connection device sends a supercharging request message to the charging pile based on the charging device indicated by the authentication message having the function of outputting power greater than or equal to the preset power, including: the on-board charging connection device sends a temperature request message to the charging pile based on the charging device indicated by the authentication message having the function of outputting power greater than or equal to the preset power; the charging pile controls the liquid cooling device to transmit liquid-phase cooling medium to the electric vehicle based on the temperature requirement information of the electric vehicle, and the on-board charging connection device sends a supercharging request message to the charging device based on the liquid-phase cooling medium transmitted by the liquid cooling device meeting the temperature requirement information of the electric vehicle.

[0028] In combination with the third aspect, in certain implementations of the third aspect, the on-board charging connection device includes a vehicle-end charging connection confirmation CC interface and a vehicle-end cooling CC interface, the charging equipment includes a pile-end charging CC interface, and the liquid cooling equipment includes a pile-end cooling CC interface; the on-board charging connection device and the charging pile each respectively judge the connection status between the electric vehicle and the charging equipment in the charging pile, and the connection status between the electric vehicle and the external liquid cooling equipment in the charging pile, including: the charging pile detects the voltage signal of the pile-end charging CC interface, and judges the connection status between the charging equipment and the electric vehicle based on the voltage signal of the pile-end charging CC interface; the charging pile detects the voltage signal of the pile-end cooling CC interface, and judges the connection status between the liquid cooling equipment and the electric vehicle based on the voltage signal of the pile-end cooling CC interface; the on-board charging connection device detects the voltage signal of the vehicle-end charging CC interface, and judges the connection status between the electric vehicle and the charging equipment based on the voltage signal of the vehicle-end charging CC interface; the on-board charging connection device detects the voltage signal of the vehicle-end cooling CC interface, and judges the connection status between the charging vehicle and the liquid cooling equipment based on the voltage signal of the vehicle-end cooling CC interface.

[0029] In combination with the third aspect, in certain implementations of the third aspect, the charging method also includes: when the temperature of the power transmission circuit between the electric vehicle and the charging device is greater than a preset temperature, the on-board charging connection device sends a power limit request message to the charging pile, and the power limit request message is used to instruct the charging device to reduce the output power; the charging pile controls the charging device to reduce the output power.

[0030] Regarding the beneficial effects of the second to third aspects, reference can be made to the beneficial effects of the first aspect mentioned above, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 is a schematic structural diagram of a charging system provided in an embodiment of the present application.

[0032] FIG2 is a schematic structural diagram of a charging system provided in an embodiment of the present application.

[0033] FIG3 is a schematic structural diagram of a charging system provided in an embodiment of the present application.

[0034] FIG4 is a schematic structural diagram of an electric vehicle including an on-board charging connection device provided in an embodiment of the present application.

[0035] FIG5 is a schematic structural diagram of an electric vehicle including an on-board charging connection device provided in an embodiment of the present application.

[0036] 6 is a structural schematic diagram of an electric vehicle provided with a pipeline structure for transmitting liquid-phase heating medium separately provided between the first liquid inlet and outlet and the second liquid inlet and outlet according to an embodiment of the present application.

[0037] FIG7 is a schematic structural diagram of the connection between an on-board charging connection device, a power battery, and a thermal management system provided in an embodiment of the present application.

[0038] FIG8 is a schematic structural diagram of a power battery provided in an embodiment of the present application.

[0039] FIG9 is a schematic structural diagram of the connection between an on-board charging connection device, a power battery, and a thermal management system provided in an embodiment of the present application.

[0040] FIG10 is a schematic structural diagram of the connection between an on-board charging connection device, a power battery, and a thermal management system provided in an embodiment of the present application.

[0041] FIG11 is a schematic structural diagram of the connection between an on-board charging connection device, a power battery, and a thermal management system provided in an embodiment of the present application.

[0042] FIG12 is a schematic structural diagram of a charging pile provided in an embodiment of the present application.

[0043] FIG13 is a schematic structural diagram of a device body provided in an embodiment of the present application.

[0044] FIG14 is a schematic structural diagram of a device body provided in an embodiment of the present application.

[0045] FIG15 is a specific circuit structure diagram of a vehicle-mounted charging connection device and a charging pile for determining the connection status provided in an embodiment of the present application.

[0046] FIG16 is a specific circuit structure diagram of a connection status determination between an on-vehicle charging connection device and a charging pile provided in an embodiment of the present application.

[0047] FIG17 is a flow chart of a charging method provided in an embodiment of the present application.

[0048] FIG18 is a flow chart of a charging method provided in an embodiment of the present application.

[0049] FIG19 is a flow chart of a charging method provided in an embodiment of the present application.

[0050] FIG20 is a flow chart of a charging method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0051] Before introducing the embodiments of the present application, the following points are first explained.

[0052] In the description of the embodiments of this application, "electrical connection" can refer to the transmission of signals between two electrical components through direct or indirect electrical connection. For example, the connection between A and B can be understood as a direct electrical connection between A and B, or it can be understood as an indirect connection between A and B through one or more other electrical components.

[0053] In the description of the embodiments of the present application, unless otherwise specified, "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone.

[0054] In the embodiments of the present application, prefixes such as "first" and "second" are used only to distinguish different description objects and have no limiting effect on the position, order, priority, quantity or content of the described objects. The use of prefixes such as ordinal numbers to distinguish description objects in the embodiments of the present application does not constitute a restriction on the described objects. For the statement of the described objects, please refer to the description in the context of the claims or embodiments, and the use of such prefixes should not constitute an unnecessary restriction. In addition, in the description of this embodiment, unless otherwise specified, the meaning of "plurality" is two or more.

[0055] The following is an explanation of the technical terms that may appear in the embodiments of this application.

[0056] Connection confirmation (CC) signal: A functional signal that indicates, electronically or mechanically, whether the vehicle plug is electrically connected to the electric vehicle and / or the power plug is electrically connected to the charging device. The interface used to transmit CC signals is called a CC interface. For DC-charged electric vehicles, the interfaces for transmitting CC signals are further divided into two: CC1 and CC2. CC1 is the connection confirmation signal on the charging pile side, and CC2 is the connection confirmation signal on the vehicle side.

[0057] Battery Management System (BMS): A control system that protects the safe use of power batteries in electric vehicles. It monitors the use status of power batteries and takes necessary measures to alleviate inconsistencies in power batteries, providing safety guarantees for the use of power batteries.

[0058] Thermal management system (TMS): It is an important component of electric vehicles and mainly includes three parts: air conditioning thermal management system, electrode and electronic control cooling system, and battery thermal management system. It is used to provide the required cooling and heating for the passenger compartment, battery, motor, air conditioner, etc., to perform thermal management on these management objects and keep the temperature of these management objects within the normal operating range.

[0059] The technical solution in this application will be described below with reference to the accompanying drawings.

[0060] First, to facilitate understanding of the technical solutions provided by the embodiments of the present application, the application scenarios to which the embodiments of the present application are applicable are introduced below.

[0061] FIG1 is a schematic structural diagram of a charging system 10 provided in an embodiment of the present application.

[0062] As shown in (a) and (b) of FIG. 1 , the charging system 10 may include a charging device 11 and an electric vehicle 12 .

[0063] In some embodiments, as shown in FIG1(a), the charging device 11 may be a split-type charging device. Specifically, the charging device 11 may include a charging host 111, at least one charging terminal 112, and at least one charging gun 113. The charging host 111 is electrically connected to each charging terminal 112, and each charging terminal 112 is electrically connected to a charging gun 113 via a cable. The charging gun 113 is used to electrically connect to the electric vehicle 12.

[0064] The charging host 111 includes multiple power conversion devices, which can convert AC power from the external power grid 20 into stable DC power and transmit it to the charging terminal 112. The DC power is then transmitted to the electric vehicle 12 via a charging gun 113 electrically connected to the charging terminal 112. The multiple power conversion devices may include, for example, an alternating current-direct current (AC-DC) converter and a direct current-direct current (DC-DC) converter.

[0065] In specific implementation, the user can insert the charging gun 113 into the charging port of the electric vehicle 12 to electrically connect the charging gun 113 to the BMS (not shown in the figure) in the electric vehicle 12, and the charging host 111 can then charge the power battery of the electric vehicle 12 through the charging gun 113.

[0066] The charging terminal 112 may include a housing, a human-computer interaction interface, a charging control unit, a metering and billing unit, etc., and is used to perform information exchange, energy transmission, metering and billing, etc. with the electric vehicle 12.

[0067] The electric vehicle 12 may be a vehicle powered by electricity. For example, the electric vehicle 12 may be a pure electric vehicle (pure EV / battery EV), a hybrid electric vehicle (HEV), a range-extended electric vehicle (REEV), or a plug-in hybrid electric vehicle (PHEV).

[0068] In other embodiments, as shown in FIG1( b ), the charging device 11 may be an integrated charging device. Specifically, the charging device 11 may include only a charging host 111 and at least one charging gun 113 electrically connected to the charging host 111, without including a charging terminal 112. The human-machine interface, charging control unit, and metering and billing unit may be directly incorporated into the charging host 111. The multiple power conversion devices within the charging host 111 convert AC power from the external power grid 20 into stable DC power, which is then directly delivered to the electric vehicle 12 via the charging gun 113.

[0069] In the aforementioned charging system 10, with the development of high-rate charging technology for power batteries and users' increasing demands for shorter charging times for electric vehicles 12, high-power charging of the electric vehicle 12 by the charging device 11 has become a future development trend. For example, the charging device 11 performs short-term fast charging or supercharging of the power battery of the electric vehicle 12. However, in current practical applications, when the charging device 11 performs high-power charging on the power battery, the heat generated by the power battery increases significantly. If this heat cannot be removed in a timely manner, the high-power charging of the power battery by the charging device 11 cannot be performed normally.

[0070] Although electric vehicles 12 generally have a built-in thermal management system that can provide the necessary cooling capacity for power battery heat dissipation, as charging power increases, such as in supercharging scenarios, the heat generated by the power battery increases. The cooling effect of relying solely on the thermal management system is limited. The cooling capacity of the thermal management system can no longer meet the power battery's heat dissipation requirements during high-power charging.

[0071] Currently, some electric vehicles 12 utilize additional cooling systems to cool the power battery during high-power charging, thereby increasing the cooling efficiency of the power battery during high-power charging. However, this additional cooling system not only takes up space in the electric vehicle 12 but also increases the vehicle's weight and manufacturing cost, making the development of the entire system of the electric vehicle 12 more difficult. Furthermore, the additional cooling system is idle except during high-power charging, resulting in low cooling system utilization.

[0072] Based on the above content, an embodiment of the present application provides a vehicle-mounted charging connection device, an electric vehicle, a charging pile, a charging system and a charging method. The purpose is to use the vehicle-mounted charging connection device to enable the electric vehicle to be charged at high power through the charging equipment in the charging pile, while also utilizing the liquid cooling equipment provided in the charging pile to cool the power battery of the electric vehicle, so as to meet the heat dissipation requirements of the power battery during high-power charging, thereby facilitating the high-power charging of the electric vehicle by the charging pile.

[0073] The following, in conjunction with the accompanying drawings, provides a detailed description of the on-board charging connection device, electric vehicle, charging pile, and charging system provided in the embodiments of the present application. It should be noted that, for ease of understanding, in the drawings provided in the embodiments of the present application, solid lines are used to represent power transmission lines, short dashed lines are used to represent pipeline connection lines, and long dashed lines are used to represent signal transmission lines.

[0074] FIG2 is a schematic structural diagram of a charging system 200 provided in an embodiment of the present application.

[0075] 2 , the charging system 200 may include a vehicle-mounted charging connection device 310 and a charging pile 400 .

[0076] The onboard charging connection device 310 may include a vehicle-side charging input interface 311 and a vehicle-side liquid inlet and outlet 312. The charging pile 400 may include a charging device 410 and a liquid cooling device 420. The charging device 410 may include a charging host 412 and a pile-side charging output interface 411 electrically connected to the charging host 412. The liquid cooling device 420 may include a pile-side liquid inlet and outlet 421.

[0077] The charging host 412 may include multiple power conversion devices that can convert AC power from the external power grid into stable DC power and then transmit it to the charging output interface 411 on the charging station. The charging output interface 411 on the charging station can be used to electrically connect to the vehicle-side charging input interface 311, so that the multiple power conversion devices can output DC power to the vehicle-side charging input interface 311. The charging station liquid inlet and outlet 421 can be used to connect to the vehicle-side liquid inlet and outlet 312 to transmit the liquid cooling medium transmitted from the liquid cooling device 420 to the vehicle-side liquid inlet and outlet 312.

[0078] In a specific implementation, the on-board charging connection device 310 can be applied to an electric vehicle 300, which includes a power battery 320 and a thermal management system 330 for the power battery (hereinafter referred to as the thermal management system 330). The thermal management system 330 can be connected to the power battery 320 via a pipeline to cool the power battery 320. Specifically, the vehicle-side charging input interface 311 of the on-board charging connection device 310 can be electrically connected to the power battery 320 to transmit the DC power output by the multiple power conversion devices to the power battery 320 to charge the power battery 320. The vehicle-side liquid inlet and outlet 312 can be connected to the thermal management system 330 via a pipeline to transmit the liquid cooling medium in the liquid cooling device 420 to the thermal management system 330 through the vehicle-side liquid inlet and outlet 312, so that the thermal management system 330 can use the liquid cooling device 420 to cool the power battery 320.

[0079] It is understood that the charging device 410 can be a split-type charging device as shown in Figure 1 (a) or an integrated charging device as shown in Figure 1 (b). For ease of description and understanding, the present embodiment of the application uses the split-type charging device as shown in Figure 1 (a) as an example for description.

[0080] Specifically, referring to Figure 2 , the charging device 410 may further include at least one charging terminal 413 electrically connected to a charging host 412. Each charging terminal 413 may be electrically connected to a charging gun (not shown) via a cable. The charging output interface 411 on the charging gun may be a charging plug provided in the charging gun. Accordingly, the vehicle-side charging input interface 311 may be a charging socket provided in the vehicle-mounted charging connection device 310, configured to plug into the charging output interface 411 on the charging gun.

[0081] For a detailed description of the charging device 410 , please refer to the embodiment shown in FIG1 , which will not be repeated here.

[0082] It is also understandable that the liquid cooling device 420 may be disposed outside the charging device 410 or integrated within the charging device 410 .

[0083] For example, in some embodiments, referring to FIG2 , the liquid cooling device 420 is disposed outside the charging device 410. The liquid cooling device 420 may include a device body 422 and a liquid cooling gun (not shown) connected to the device body 422 via a pipeline. The device body 422 may include a cooling system for the liquid cooling device 420, in which the liquid phase cooling medium in the cooling system is transmitted to the liquid cooling gun via a pipeline, and the pile-end liquid inlet and outlet 421 may be a liquid cooling plug disposed in the liquid cooling gun. Correspondingly, the vehicle-end liquid inlet and outlet 312 may be a liquid cooling socket disposed in the on-board charging connection device 310, for plugging into the pile-end liquid inlet and outlet 421 in the liquid cooling gun.

[0084] In other embodiments, refer to FIG3 , which is a schematic diagram of the structure of another charging system 200 provided in an embodiment of the present application. In the embodiment shown in FIG3 , the device body 422 of the liquid cooling device 420 can be integrated into the charging host 412 of the charging device 410. In this case, the charging host 412 can be connected to the charging and cooling integrated composite gun, and the pile-end charging output interface 411 and the pile-end liquid inlet and outlet 421 can be composite plugs provided in the composite gun. Correspondingly, the vehicle-end charging input interface 311 and the vehicle-end liquid inlet and outlet 312 can be composite sockets provided in the vehicle-mounted charging connection device 310, for plugging into the composite plug in the above-mentioned composite gun.

[0085] It should be understood that, for ease of description and understanding, the embodiment of the present application is described by taking the example of the liquid cooling device 420 being arranged outside the charging device 410 .

[0086] In the embodiment of the present application, the on-board charging connection device 310 has a vehicle-side charging input interface 311 for electrically connecting to a charging device 410, and a vehicle-side liquid inlet and outlet 312 for connecting to a liquid cooling device 420. When the on-board charging connection device 310 is applied to an electric vehicle 300, the electric vehicle 300 can be simultaneously connected to the charging device 410 and the liquid cooling device 420 directly through the on-board charging connection device 310. In this way, while the charging device 410 is performing high-power charging on the electric vehicle 300, the external liquid cooling device 420 can be used to cool the power battery 320 of the electric vehicle 300, thereby meeting the heat dissipation requirements of the power battery 320 during high-power charging and facilitating high-power charging of the electric vehicle 300 by the charging device 410. Furthermore, by providing the vehicle-side charging input interface 311 and the vehicle-side liquid inlet and outlet 312 on the on-board charging connection device 310, the difficulty and cost of modifying the entire electric vehicle 300 are reduced.

[0087] In addition, the power battery 320 is cooled by using a liquid cooling device 420 outside the vehicle, so that there is no need to add an additional cooling system for the power battery 320 in the electric vehicle 300, avoiding an increase in the weight of the entire vehicle, which is conducive to reducing the manufacturing cost of the electric vehicle 300 and the difficulty of developing the entire vehicle system.

[0088] The vehicle-mounted charging connection device 310 and the charging pile 400 in the charging system 200 are respectively described in detail below.

[0089] FIG4 and FIG5 are schematic structural diagrams of an electric vehicle 300 including an on-board charging connection device 310 provided in an embodiment of the present application.

[0090] 4 and 5 , the electric vehicle 300 may include an on-board charging connection device 310 , a power battery 320 , and a thermal management system 330 .

[0091] The on-board charging connection device 310 includes at least one vehicle-side charging input interface 311, a vehicle-side charging output interface 313, a first liquid inlet and outlet 312, and a second liquid inlet and outlet 314. Each vehicle-side charging input interface 311 is electrically connected to a vehicle-side charging output interface 313. The vehicle-side charging input interface 311 can be used to electrically connect to a charging device 410, such as the charging output interface 411 of the charging device 410 shown in FIG. 2 . The vehicle-side charging output interface 313 can be used to electrically connect to the power battery 320, allowing the charging device 410 to charge the power battery 320 through the on-board charging connection device 310.

[0092] The first liquid inlet and outlet 312 is connected to the second liquid inlet and outlet 314 by a pipeline. The first liquid inlet and outlet 312 can be used to connect to an external liquid cooling device, for example, it can be connected to the pile end liquid inlet and outlet 421 of the liquid cooling device 420 shown in Figure 2. The second liquid inlet and outlet 314 can be used to connect to the thermal management system 330, so that the external liquid cooling device can transmit liquid-phase cooling medium to the thermal management system 330 through the on-board charging connection device 310, so that the thermal management system 330 uses the liquid-phase cooling medium transmitted by the liquid cooling device 420 to cool the power battery 320.

[0093] It can be understood that, in the embodiment of the present application, the first liquid inlet and outlet 312 can be the vehicle-end liquid inlet and outlet 312 shown in Figures 2 and 3.

[0094] In the embodiment of the present application, by providing a vehicle-side charging input interface 311, a vehicle-side charging output interface 313, a first liquid inlet and outlet 312, and a second liquid inlet and outlet 314 in the vehicle-mounted charging connection device 310, the power battery 320 in the electric vehicle 300 can be connected to the charging device and the off-vehicle liquid cooling device through the vehicle-mounted charging connection device 310. In this way, when the electric vehicle 300 is charged at high power through the charging device, the off-vehicle liquid cooling device can be used to cool the power battery 320, thereby meeting the heat dissipation requirements of the power battery 320 during high-power charging, thereby facilitating high-power charging of the electric vehicle 300.

[0095] In some embodiments, the number of vehicle-side charging input interfaces 311 and the number of first liquid inlet and outlet ports 312 can be one or more. In one example, the number of vehicle-side charging input interfaces 311 is multiple, and the number of first liquid inlet and outlet ports 312 is one. The multiple vehicle-side charging input interfaces 311 can be multiple charging sockets, and the first liquid inlet and outlet port 312 can be a liquid cooling socket. In another example, the number of vehicle-side charging input interfaces 311 and the number of first liquid inlet and outlet ports 312 can be multiple and one-to-one corresponding, and each vehicle-side charging input interface 311 can be integrated with the corresponding first liquid inlet and outlet port 312 into a composite socket.

[0096] For ease of description and understanding, the embodiment of the present application is described by taking an example in which the number of vehicle-side charging input interfaces 311 is multiple and the number of first liquid inlet and outlet ports 312 is one.

[0097] In the embodiment of the present application, the number of vehicle-side charging input interfaces 311 and first liquid inlet and outlet ports 312 can be flexibly configured on the onboard charging connection device 310 to meet different production and design requirements. Furthermore, the number of vehicle-side charging input interfaces 311 and first liquid inlet and outlet ports 312 only involves redesigning the onboard charging connection device 310, requiring minimal changes to the electric vehicle 300, thereby reducing the development difficulty and cycle time of the electric vehicle 300.

[0098] Continuing to refer to FIG4 , in some embodiments, to ensure that the charging device 410 charges the electric vehicle 300 normally, each vehicle-side charging input interface 311 may include a vehicle-side DC interface 3111 and a vehicle-side charging CC interface 3112. Each vehicle-side DC interface 3111 is electrically connected to the vehicle-side charging output interface 313 via a positive and negative DC power transmission cable for power transmission. The voltage signal of the vehicle-side charging CC interface 3112 can be used to indicate the connection status between the vehicle-side charging input interface 311 and the charging device 410, for example, it can indicate the connection status between the vehicle-side charging input interface 311 and the pile-side charging output interface 411 of the charging device 410 shown in FIG2 .

[0099] It can be understood that the voltage signal of the vehicle-side charging CC interface 3112 can refer to the voltage value of the vehicle-side charging CC interface 3112, and different voltage values ​​are used to represent different connection states between the vehicle-side charging input interface 311 and the pile-side charging output interface 411.

[0100] In a specific implementation, in some embodiments, the vehicle-mounted charging connection device 310 may further include a vehicle-mounted charging connection controller 315, which may be electrically connected to the vehicle-side charging CC interface 3112. The vehicle-mounted charging connection controller 315 may be configured to detect a voltage signal from the vehicle-side charging CC interface 3112 and, based on the voltage signal from the vehicle-side charging CC interface 3112, determine the connection status between the vehicle-side charging input interface 3112 and the charging device 410.

[0101] For example, when the on-board charging connection controller 315 detects that the voltage value of the vehicle-side charging CC interface 3112 is 0, it can be determined that the vehicle-side charging input interface 311 and the pile-side charging output interface 411 are not connected; when the on-board charging connection controller 315 detects that the voltage value of the vehicle-side charging CC interface 3112 is 6V, it can be determined that the vehicle-side charging input interface 311 and the pile-side charging output interface 411 are connected.

[0102] It can be understood that in the embodiment of the present application, the on-board charging connection controller 315 can be, for example, any one of a central processor unit (CPU), a network processor (NP), a digital signal processor (DSP), a micro controller unit (MCU) and a programmable logic device (PLD).

[0103] Continuing to refer to Figure 4, similarly, in some embodiments, to ensure that the on-board charging connection device 310 receives the liquid cooling medium transmitted by the liquid cooling device 420 normally, the first liquid inlet and outlet 312 may include a first liquid inlet interface 3121, a first liquid outlet interface 3122 and a vehicle-end cooling CC interface 3123, and the second liquid inlet and outlet 314 may include a second liquid inlet interface 3141 and a second liquid outlet interface 3142.

[0104] The first liquid inlet port 3121 is connected to the second liquid outlet port 3142, which is then connected to the second liquid inlet port 3141. The second liquid outlet port 3142 and the second liquid inlet port 3141 can each be connected to the thermal management system 330. The first liquid inlet port 3121 is configured to receive liquid-phase cooling medium transmitted from the liquid cooling device 420 and transmit the liquid-phase cooling medium to the thermal management system 330 via the second liquid outlet port 3142. This allows the liquid-phase cooling medium to exchange heat with the power battery 320 through the thermal management system 330 to cool the power battery 320. The liquid-phase cooling medium in the thermal management system 330 can be transmitted to the onboard charging connection device 310 via the second liquid inlet port 3141 and further transmitted to the liquid cooling device 420 via the first liquid outlet port 3131, thereby forming a cooling cycle for the power battery 320 using the liquid-phase cooling medium. The voltage signal of the vehicle-end cooling CC interface 3123 can be used to indicate the connection status of the first liquid inlet and outlet 312 and the liquid cooling device 420, for example, it can indicate the connection status of the first liquid inlet and outlet 312 and the pile-end liquid inlet and outlet 421 of the liquid cooling device 420 shown in Figure 4.

[0105] In specific implementation, in some embodiments, the vehicle-mounted charging connection controller 315 can be used to: detect the voltage signal of the vehicle-end cooling CC interface 3123, and determine the connection status of the first liquid inlet and outlet 312 and the liquid cooling device 420 based on the voltage signal of the vehicle-end cooling CC interface 3123.

[0106] It is understood that, similar to the voltage signal of the vehicle-side charging CC interface 3112, the voltage signal of the vehicle-side cooling CC interface 3123 can refer to the voltage value of the vehicle-side cooling CC interface 3123, with different voltage values ​​representing different connection states between the first liquid inlet and outlet 312 and the pile-end liquid inlet and outlet 421. For example, when the on-board charging connection controller 315 detects that the voltage value of the vehicle-side cooling CC interface 3123 is 0, it can indicate that the first liquid inlet and outlet 312 and the pile-end liquid inlet and outlet 421 are not connected; when the on-board charging connection controller 315 detects that the voltage value of the vehicle-side cooling CC interface 3123 is 4V, it can indicate that the first liquid inlet and outlet 312 and the pile-end liquid inlet and outlet 421 are connected.

[0107] It can be understood that the above-mentioned determination of the connection status between the vehicle-side charging input interface 311 and the pile-side charging output interface 411, and the connection status between the first liquid inlet and outlet 312 and the pile-side liquid inlet and outlet 421 according to the vehicle-side charging CC interface 3112 and the vehicle-side cooling CC interface 3123 will be described in detail below and will not be repeated here.

[0108] Continuing with FIG4 , in some embodiments, the on-board charging connection device 310 may further include a charging circuit contactor 3100. The charging circuit contactor 3100 is electrically connected between each vehicle-side DC interface 3111 and the vehicle-side charging output interface 313. Specifically, the charging circuit contactor 3100 may include charging circuit contactors K5 and K6, which are electrically connected to the positive and negative DC power transmission cables between the vehicle-side DC interface 3111 and the vehicle-side charging output interface 313, respectively.

[0109] The charging circuit contactor 3100 can be used to disconnect or connect the power transmission circuit between the vehicle-side DC interface 3111 electrically connected to the charging circuit contactor 3100 and the power battery 320. In a specific implementation, the on-board charging connection controller 315 can be electrically connected to the charging circuit contactor 3100 and used to control the opening and closing state of the charging circuit contactor 3100 to disconnect or connect the power transmission circuit between the vehicle-side DC interface 3111 and the power battery 320.

[0110] For example, the vehicle-side charging connection controller 315 can be used to: in response to the vehicle-side charging input interface 311 being connected to the charging device 410, control the charging circuit contactor 3100 electrically connected to the vehicle-side DC interface 3111 of the vehicle-side charging input interface 311 to close, so as to conduct the power transmission circuit between the vehicle-side DC interface 3111 and the power battery 320.

[0111] In an embodiment of the present application, the power transmission circuit between the charging device 410 and the power battery 320 is disconnected or connected by a charging circuit contactor 3100 provided in the vehicle-mounted charging connection device 310, and the charging circuit contactor 3100 can be controlled by the vehicle-mounted charging connection device 310, which is beneficial to reducing the changes to the charging control function of the electric vehicle 300 itself caused by the multiple vehicle-end charging input interfaces 311 provided on the vehicle-mounted charging connection device 310, so that the changes to the entire vehicle of the electric vehicle 300 are relatively small, which is beneficial to reducing the development difficulty and cycle of the electric vehicle 300.

[0112] In one example, to provide short-circuit protection for the power transmission circuit between the vehicle-side DC interface 3111 and the vehicle-side charging output interface 313, the on-board charging connection device 310 further includes a fuse FU. The fuse FU can be connected in series with the charging circuit contactor 3100 between each vehicle-side DC interface 3111 and the vehicle-side charging output interface 313. The fuse FU can be used to disconnect the power transmission circuit between the vehicle-side DC interface 3111 and the vehicle-side charging output interface 313, to which the fuse FU is electrically connected, if the current transmitted to the fuse FU exceeds a preset current.

[0113] Optionally, the fuse FU may be electrically connected to the positive DC power transmission cable, or electrically connected to the negative DC power transmission cable.

[0114] In other embodiments, referring to FIG5 , the electric vehicle 300 may further include a high-voltage distribution unit 350 , which may be electrically connected between the vehicle-side charging output interface 313 and the power battery 320 . The charging circuit contactor 3100 may not be provided within the onboard charging connection device 310 , and the power transmission circuit between the charging device 410 and the power battery 320 may be disconnected or connected via the charging circuit contactor 351 provided within the high-voltage distribution unit 350 .

[0115] Specifically, referring to FIG5 , the high-voltage distribution unit 350 may include a charging circuit contactor 351. Each vehicle-side DC interface 3111 of the vehicle-side charging input interface 311 is electrically connected to the vehicle-side charging output interface 313 via positive and negative DC power transmission cables, and further electrically connected to the power battery 320 via the charging circuit contactor 351 in the high-voltage distribution unit 350. Specifically, the charging circuit contactor 351 may include charging circuit contactors K5 and K6, which are electrically connected to the positive and negative DC power transmission cables, respectively, between the vehicle-side charging output interface 313 and the power battery 320.

[0116] It can be understood that in the embodiment of the present application, compared with setting the charging circuit contactor 3100 in the vehicle-mounted charging connection device 310, the charging circuit contactor 351 set in the high-voltage distribution unit 350 of the electric vehicle 300 is directly used to disconnect or conduct the power transmission circuit between the charging device 410 and the power battery 320, which is beneficial to reducing the volume of the vehicle-mounted charging connection device 310 and facilitating the miniaturization of the vehicle-mounted charging connection device 310.

[0117] In some embodiments, referring to FIG. 5 , the vehicle-mounted charging connection controller 315 may be electrically connected to the charging circuit contactor 351 and configured to control the opening and closing states of the charging circuit contactor 351 to disconnect or connect the power transmission circuit between the electrically connected vehicle-side charging output interface 313 and the power battery 320 .

[0118] In other embodiments, referring to FIG5 , the electric vehicle 300 may further include a vehicle control system 340. The vehicle control system 340 may include an electrically connected vehicle control unit (VCU) 341 and a battery management system (BMS) 342. The vehicle control unit 341 may be electrically connected to a charging circuit contactor 351 and configured to control the opening and closing states of the charging circuit contactor 351 to disconnect or connect the power transmission circuit between the electrically connected vehicle-side charging output interface 313 and the power battery 320.

[0119] It is understood that, in a specific implementation, the on-board charging connection device 310 can be communicatively connected to the vehicle control system 340, specifically, the on-board charging connection controller 315 can be communicatively connected to the vehicle control system 340. For example, the on-board charging connection controller 315 can be communicatively connected to the vehicle controller 341 and the battery management system 342 via a controller area network (CAN), so as to perform signaling exchanges when the power battery 320 has charging or other requirements. For example, the vehicle controller 341 can receive relevant information about the power battery 320 sent by the battery management system 342, such as information about the charging and cooling requirements of the power battery 320, and send the obtained relevant information about the power battery 320 to the on-board charging connection controller 315. Alternatively, the battery management system 342 can also directly send the relevant information about the power battery 320 to the on-board charging connection controller 315.

[0120] Continuing with FIG4 , in some embodiments, the onboard charging connection device 310 may further include a vehicle-side DC interface temperature sensor 316. The vehicle-side DC interface temperature sensor 316 may be configured to detect at least one of the following temperatures: the temperature of the vehicle-side DC interface 3111 or the temperature of a power transmission cable electrically connected to the vehicle-side DC interface 3111.

[0121] Specifically, the number of temperature sensors 316 of the vehicle-end DC interface can be the same as the number of the vehicle-end charging input interface 311 and correspond one to one. The temperature sensor 316 of each vehicle-end DC interface can be set close to the corresponding vehicle-end DC interface 3111 and used to detect the temperature of the corresponding vehicle-end DC interface 3111, the temperature of the power transmission cable electrically connected to the vehicle-end DC interface 3111, the temperature of the charging return contactor 3100 electrically connected to the power transmission cable, etc.

[0122] In a specific implementation, the vehicle-side charging controller 315 can be electrically connected to the vehicle-side DC interface temperature sensor 316. Specifically, the vehicle-side charging controller 315 can be used to obtain the temperature detected by the vehicle-side DC interface temperature sensor 316 to implement real-time monitoring and alarm of the temperature of the vehicle-side DC interface 3111, the temperature of the power transmission cable electrically connected to the vehicle-side DC interface 3111, and the temperature of the charging return contactor 3100 electrically connected to the power transmission cable.

[0123] The above describes the structure of the power transmission circuit between the vehicle-side charging input interface 311 and the vehicle-side charging output interface 313 in the vehicle-mounted charging connection device 310. The following describes the pipeline structure connecting the first inlet and outlet 312 and the second inlet and outlet 314 in the vehicle-mounted charging connection device 310.

[0124] Continuing with Figures 4 and 5 , in some embodiments, the on-board charging connection device 310 may further include a liquid inlet pipeline 317 and a liquid outlet pipeline 318. The two ends of the liquid inlet pipeline 317 are respectively connected to the first liquid inlet interface 3121 and the second liquid outlet interface 3142, while the two ends of the liquid outlet pipeline 318 are respectively connected to the first liquid outlet interface 3122 and the second liquid inlet interface 3141. The liquid inlet pipeline 317 is used to transfer the liquid-phase cooling medium transmitted from the first liquid inlet interface 3121 to the second liquid outlet interface 3142 by the liquid cooling device 420, and then to the thermal management system 330 via the second liquid outlet interface 3142, so that the liquid-phase cooling medium can exchange heat with the power battery 320 through the thermal management system 330. The liquid outlet pipeline 318 can be used to transmit the liquid cooling medium in the thermal management system 330 received by the second liquid inlet interface 3141 to the liquid cooling device 420 through the first liquid outlet interface 3122, so that the liquid cooling device 420 can cool the transmitted liquid cooling medium, thereby forming a cooling cycle of the liquid cooling medium in the thermal management system 330.

[0125] In some embodiments, when the power battery 320 needs to be heated by the thermal management system 330, the liquid inlet line 317 can also be used to transfer the liquid-phase heating medium transmitted from the liquid cooling device 420 from the first liquid inlet interface 3121 to the second liquid outlet interface 3142, and then to the thermal management system 330, so that the liquid-phase heating medium exchanges heat with the power battery 320 through the thermal management system 330 to heat the power battery 320. The liquid-phase heating medium in the thermal management system 330 can be transferred to the liquid cooling device 420 through the liquid outlet line 318, so that the liquid cooling device 420 can heat the liquid-phase cooling medium after the heat exchange, thereby forming a heating cycle of the liquid-phase heating medium in the thermal management system 330.

[0126] In some other embodiments, a pipeline for transmitting the liquid-phase heating medium may also be separately provided between the first liquid inlet and outlet 312 and the second liquid inlet and outlet 314 .

[0127] For example, FIG6 is a structural diagram of an electric vehicle 300 in which a pipeline structure for transmitting a liquid-phase heating medium is separately provided between the first liquid inlet and outlet 312 and the second liquid inlet and outlet 314 according to an embodiment of the present application.

[0128] Referring to Figure 6 , unlike the embodiments shown in Figures 4 and 5 , the on-board charging connection device 310 includes an inlet line 317, an outlet line 318, and a heated inlet line 3100. The two ends of the inlet line 317 and the two ends of the heated inlet line 3100 can be connected to a first inlet port 3121 and a second outlet port 3142, respectively. The two ends of the outlet line 318 are connected to the first outlet port 3122 and the second inlet port 3141, respectively.

[0129] The liquid inlet line 317 is used to transfer the liquid-phase cooling medium transmitted from the first liquid inlet interface 3121 of the liquid cooling device 420 to the second liquid outlet interface 3142, and then to the thermal management system 330 via the onboard charging connection device 310 through the second liquid outlet interface 3142, so that the liquid-phase cooling medium cools the power battery 320 through the thermal management system 330. The heating liquid inlet line 3100 can be used to transfer the liquid-phase heating medium transmitted from the first liquid inlet interface 313 of the liquid cooling device 420 to the second liquid outlet interface 3142, and then to the thermal management system 330, so that the liquid-phase heating medium heats the power battery 320 through the thermal management system 330. The liquid outlet pipeline 318 can be used to transfer the liquid cooling medium or liquid heating medium in the thermal management system 330 received by the second liquid inlet interface 3141 to the liquid cooling device 420 through the first liquid outlet interface 3122, thereby forming a cooling cycle of the liquid cooling medium in the thermal management system 330, or forming a heating cycle of the liquid heating medium in the thermal management system 330.

[0130] In specific implementations, in some embodiments, as shown in FIG6 , the on-board charging connection device 310 may further include a shutoff valve 3300 and a shutoff valve 3400 . The shutoff valve 3300 may be connected to the liquid inlet line 317 and used to control the flow of the liquid inlet line 317. The shutoff valve 3400 may be connected to the heating liquid inlet line 3100 and used to control the flow of the heating liquid inlet line 3100. When the liquid cooling device 420 transmits liquid-phase cooling medium from the first liquid inlet port 3121, the shutoff valve 3300 may be opened and the shutoff valve 3400 may be opened, allowing the liquid-phase cooling medium to flow through the liquid inlet line 317 to the second liquid outlet port 3142. When the liquid cooling device 420 transmits liquid-phase heating medium from the first liquid inlet port 3121, the shutoff valve 3400 may be opened and the shutoff valve 3300 may be opened, allowing the liquid-phase cooling medium to flow through the heating liquid inlet line 3100 to the second liquid outlet port 3142.

[0131] In some embodiments, referring to FIG6 , different from the embodiments shown in FIG4 and FIG5 , in order to increase the power delivered from the vehicle-mounted charging connection device 310 to the power battery 320 , the vehicle-end DC interface 3111 and the vehicle-end charging output interface 313 can be electrically connected through multiple pairs of positive and negative DC power cables.

[0132] In some embodiments, referring to FIG6 , in order to further cool the power transmission circuit between the vehicle-end DC interface 3111 and the vehicle-end charging output interface 313 , the vehicle-mounted charging connection device 310 may further include a heat exchange structure 3200 . The heat exchange structure 3200 may be connected to the liquid inlet pipeline 317 , so that when the liquid inlet pipeline 317 transmits a liquid-phase cooling medium, the liquid-phase cooling medium may be heat-exchanged with the vehicle-end DC interface 3111 and the power transmission cable electrically connected to the vehicle-end DC interface 3111 through the heat exchange structure 3200 , so as to cool the vehicle-end DC interface 3111 and the power transmission cable electrically connected to the vehicle-end DC interface 3111 .

[0133] Exemplarily, the heat exchange structure 3200 can be a heat-conducting circulation conduit that can be thermally connected to the vehicle-side DC interface 3111 and the power transmission cable electrically connected thereto. Heat generated by the vehicle-side DC interface 3111 and the power transmission cable electrically connected thereto can be thermally transferred to the heat exchange structure 3200. The heat exchange structure 3200 can be connected to the liquid inlet line 317, so that when the liquid cooling medium transmitted by the liquid inlet line 317 flows through the circulation conduit, it absorbs heat from the heat exchange structure 3200. The liquid cooling medium, having absorbed heat, can be transferred to the thermal management system 330 via the second liquid outlet 3142 to continue cooling the power battery 320.

[0134] It can be understood that the specific structure of the above-mentioned heat exchange structure 3200 is only for illustration. In the embodiment of the present application, as long as the heat exchange structure 3200 can be connected to the liquid inlet pipeline 317 and can enable the liquid cooling medium transmitted by the liquid inlet pipeline 317 to perform heat exchange with the vehicle-end DC interface 3111 and the power transmission cable electrically connected to the vehicle-end DC interface 3111.

[0135] 4 and 5 , in some embodiments, the vehicle-mounted charging connection device 310 may further include a first liquid inlet and outlet temperature sensor 319 . The first liquid inlet and outlet temperature sensor 319 may be used to detect the temperature of the first liquid inlet and outlet 312 .

[0136] Specifically, the first liquid inlet and outlet temperature sensor 319 can be arranged close to the first liquid inlet and outlet 312 and used to detect the temperature of the liquid medium flowing through the first liquid inlet and outlet 312, such as the temperature of the liquid cooling medium or the liquid heating medium.

[0137] In a specific implementation, the on-board charging connection controller 315 can be electrically connected to the temperature sensor 319 of the first liquid inlet and outlet. The on-board charging connection controller 315 can be used to obtain the temperature detected by the temperature sensor 319 of the first liquid inlet and outlet, thereby enabling real-time monitoring and alarming of the temperature of the liquid medium flowing through the first liquid inlet and outlet 312.

[0138] The above describes the on-board charging connection device 310 provided in an embodiment of the present application. When the on-board charging connection device 310 is used in an electric vehicle 300, the on-board charging connection device 310 can transmit the liquid-phase cooling medium (or liquid-phase heating medium) transmitted by the liquid cooling device outside the vehicle to the thermal management system 330 of the electric vehicle 300, so that the thermal management system 330 can use the transmitted liquid-phase cooling medium to cool the power battery 320 in the electric vehicle 300. The specific piping structure of the thermal management system 330 using the liquid-phase cooling medium from the liquid cooling device outside the vehicle to cool the power battery 320 is further described below in conjunction with the accompanying drawings.

[0139] FIG7 is a schematic structural diagram of a vehicle-mounted charging connection device 310 , a power battery 320 , and a thermal management system 330 provided in an embodiment of the present application.

[0140] 7 , the thermal management system 330 may include a first vehicle-side cooling circuit 331 , a second vehicle-side cooling circuit 332 , a first heat exchanger 333 , and a cooling assembly 334 .

[0141] The first heat exchanger 333 may include a first heat exchange channel 333a and a second heat exchange channel 333b. The first heat exchange channel 333a is connected to the first cooling circuit 331, and the second heat exchange channel 333b and the power battery 320 are connected to the second cooling circuit 332. The second cooling circuit 332 is used to cool the power battery 320. The first cooling circuit 331 can exchange heat with the second cooling circuit 332 through the first heat exchanger 333.

[0142] Specifically, a first liquid working medium circulates in the first cooling circuit 331, and a second liquid working medium circulates in the second cooling circuit 332. Specifically, the first liquid working medium circulates in the first heat exchange channel 333a of the first heat exchanger 333, while the second liquid working medium circulates in the second heat exchange channel 333b of the first heat exchanger 333. When the thermal management system 330 is operating, the second liquid working medium in the second cooling circuit 332 flows into the power battery 320 and absorbs heat generated by the power battery 320. The heated second liquid working medium then flows out of the power battery 320, transferring the heat generated by the power battery 320 to the second cooling circuit 332. When the heated second liquid working medium is transferred to the second heat exchange channel 333b of the second cooling circuit 332, it can exchange heat with the first liquid working medium flowing therein through the first heat exchange channel 333a, transferring heat to the first liquid working medium, thereby cooling the second liquid working medium.

[0143] The cooled second liquid working medium can circulate in the second cooling circuit 332 and flow back into the power battery 320. The first liquid working medium, after absorbing heat, can be cooled in the first cooling circuit 331. For example, in some embodiments, the thermal management system 330 may further include an onboard cooling device 335, which is connected to the first cooling circuit 331. The onboard cooling device 335 can cool the first liquid working medium circulating in the first cooling circuit 331, thereby implementing a cooling cycle for the power battery 320 by the thermal management system 330.

[0144] In one example, the vehicle-mounted cooling device 335 may include a compressor, a condenser, and a heat exchanger. It is understood that the above-mentioned components and structures of the vehicle-mounted cooling device 335 are merely illustrative. In the embodiments of the application, as long as the components and structures of the vehicle-mounted cooling device 335 can cool the first liquid working medium circulating in the first cooling circuit 331, it will be sufficient.

[0145] In some embodiments, the thermal management system 330 may further include a thermistor 336 . The thermistor 336 may be connected to the second cooling circuit 332 and configured to monitor the temperature of the second liquid medium flowing in the second cooling circuit 332 .

[0146] It is also understood that, in a specific implementation, a flow channel may be provided in the power battery 320 for the circulation of the second liquid working medium. For example, FIG8 is a schematic diagram showing the structure of a power battery 320 provided with a flow channel.

[0147] Referring to Figure 8, the power battery 320 may include a housing 321, a liquid cooling plate 322, and a plurality of battery modules 323. The housing 321 and the liquid cooling plate 322 may enclose a storage space, and a plurality of battery modules 323 may be placed in the storage space after being connected in series and / or in parallel with each other, and thermally connected to the liquid cooling plate 322. A circulation pipe 3221 is provided in the liquid cooling plate 322. The circulation pipe 3221 may be connected to the second cooling circuit 332 so that the second liquid working medium in the second cooling circuit 332 may circulate in the circulation pipe 3221. In this way, the heat generated by the plurality of battery modules 323 may be transferred to the liquid cooling plate 322 by heat conduction, and then absorbed by the second liquid working medium circulating in the circulation pipe 3221. The second liquid working medium, after absorbing the heat, flows out of the circulation pipe 3221 to carry the heat generated by the plurality of battery modules 323 out of the power battery 320.

[0148] It can be understood that the above-mentioned structure of the power battery 320 provided with the liquid cooling plate 322 is only for illustration. In the embodiment of the present application, as long as the structure of the power battery 320 can enable the second liquid working medium in the second cooling circuit 332 to cool the power battery 320 connected to the second cooling circuit 342, it will be sufficient.

[0149] Continuing with FIG7 , cooling assembly 334 may include a cooling inlet line 3341 and a cooling outlet line 3342 . Cooling inlet line 3341 and cooling outlet line 3342 are each configured to connect to an off-board liquid cooling device, such as liquid cooling device 420 shown in FIG4 , thereby forming a third cooling circuit with the off-board liquid cooling device. This third cooling circuit is configured to cool power battery 320 .

[0150] In one example, referring again to FIG4 , one end of the cooling liquid inlet line 3341 is connected to the second liquid outlet port 3142, and the other end of the cooling liquid inlet line 351 is connected to the input port of the power battery 320. One end of the cooling liquid outlet line 3342 is connected to the second liquid inlet port 3141, and the other end of the cooling liquid outlet line 3342 is connected to the output port of the power battery 320.

[0151] Specifically, the other end of the cooling inlet pipeline 3341 can be connected to the input end of the power battery 320 connected to the second cooling circuit 332, and the other end of the cooling outlet pipeline 3342 can be connected to the output end of the power battery 320 connected to the second cooling circuit 332, so that the cooling inlet pipeline 3341 and the other end and the other end of the cooling outlet pipeline 3342 are connected to the second cooling circuit 332.

[0152] In a specific implementation, the liquid cooling medium transmitted by the liquid cooling device 420 can first be transmitted to the onboard charging connection device 310 through the first liquid inlet port 3121. Then, through the second liquid outlet port 3142 and the cooling liquid inlet line 3341, it flows from the onboard charging connection device 310 into the second cooling circuit 332 where the power battery 320 is located. The liquid cooling medium circulates within the second cooling circuit 332 and flows into the power battery 320, for example, into the flow channel 3221 of the liquid cooling plate 322 shown in Figure 7. The liquid cooling medium can flow through the flow channel 3221 of the liquid cooling plate 322 and absorb heat generated by the multiple battery modules 323. After absorbing heat, the liquid cooling medium flows out of the power battery 32 and flows into the on-board charging connection device 310 from the second liquid outlet interface 3142 through the cooling liquid outlet pipeline 352, and then is transmitted from the first liquid outlet interface 3122 of the on-board charging connection device 310 to the liquid cooling device 420 outside the vehicle to bring the heat generated by the power battery 320 out of the electric vehicle 300, thereby cooling the power battery 320.

[0153] In some embodiments, in order to drive the liquid cooling medium after absorbing heat to flow from the power battery 320 into the cooling outlet pipe 3342, the thermal management system also includes a water pump 337, which can be connected between the output end of the second heat exchange channel 333b and the cooling outlet pipe 3342.

[0154] It can be understood that in the above embodiment, since the liquid cooling medium transmitted by the liquid cooling device 420 circulates in the second cooling circuit 342, in order to avoid the liquid cooling medium transmitted by the liquid cooling device 420 affecting the purity of the second liquid working fluid in the second cooling circuit 332, the liquid cooling medium and the second liquid working fluid can be the same liquid, for example, both can be cooling water.

[0155] In some embodiments, the under-vehicle cooling system of the power battery 320 formed by the cooling liquid inlet pipeline 3341, the cooling liquid outlet pipeline 3342 and the liquid cooling equipment 420 outside the vehicle can be connected in parallel or in series with the on-vehicle cooling system of the power battery 320 formed by the first cooling circuit 331 and the second cooling circuit 332.

[0156] For example, in one possible example, referring to FIG. 7 , the cooling assembly 334 may further include a valve connected to the first three-way valve 3343 and the second three-way valve 3344 .

[0157] One end of the power battery 320 is connected to one end of the second heat exchange channel 333b via a first three-way valve 3343, while the other end of the power battery 320 and the other end of the second heat exchange channel 333b are connected via a second three-way valve 3344. One end of the cooling inlet line 3341 is connected to an external liquid cooling device, such as the cooling device 420. The other end of the cooling inlet line 3341 is connected to one end of the power battery 320 via the first three-way valve 3343. One end of the cooling outlet line 3342 is connected to an external liquid cooling device, such as the cooling device 420. The other end of the cooling outlet line 3343 is connected to the other end of the power battery 420 via the second three-way valve 3344, forming a third cooling circuit. Thus, the under-vehicle cooling system for the power battery 320, formed by the cooling inlet line 3341, the cooling outlet line 3342, and the cooling device 420, is connected in parallel with the on-vehicle cooling system for the power battery 320.

[0158] Specifically, the first valve port of the first three-way valve 3343 and the first valve port of the second three-way valve 3344 can be connected through the second channel 333b of the first heat exchanger 333, the second valve port of the first three-way valve 3343 and the second valve port of the second three-way valve 3344 can be connected through the power battery 320, and the third valve port of the first three-way valve 3343 is connected to the other end of the heat exchange inlet pipeline 3341, and the third valve port of the second three-way valve 3344 is connected to the other end of the heat exchange outlet pipeline 3342.

[0159] In specific implementation, when the electric vehicle 300 is not connected to the liquid cooling equipment 420 outside the vehicle through the on-board charging connection device 310, the first valve port and the second valve port of the first three-way valve 3343, and the first valve port and the second valve port of the second three-way valve 3344 can be controlled to be connected, and the third valve port of the first three-way valve 3343 and the third valve port of the second three-way valve 3344 can be cut off. At this time, the thermal management system 330 can cool the power battery 320 through the on-board cooling system of the power battery 320 formed by the first cooling circuit 331 and the second cooling circuit 332.

[0160] When the electric vehicle 300 is connected to the liquid cooling equipment 420 outside the vehicle through the on-board charging connection device 310, the second valve port and the third valve port of the first three-way valve 3343, and the second valve port and the third valve port of the second three-way valve 3344 can be controlled to be connected, and the first valve port of the first three-way valve 3343 and the first valve port of the second three-way valve 3344 are cut off. At this time, the thermal management system 330 can cool the power battery 320 through the under-vehicle cooling system of the power battery 320 formed by the cooling liquid inlet pipeline 3341, the cooling liquid outlet pipeline 3342 and the liquid cooling equipment 420 outside the vehicle.

[0161] In an embodiment of the present application, the off-vehicle cooling system of the power battery 320 formed by the cooling component 334 and the liquid cooling device 420 outside the vehicle can be connected in parallel with the on-vehicle cooling system of the power battery 320 in the thermal management system 330, which is beneficial to reducing the control complexity of the two cooling systems.

[0162] FIG9 is a schematic structural diagram of another on-board charging connection device 310 , a power battery 320 , and a thermal management system 330 provided in an embodiment of the present application.

[0163] Different from the embodiment shown in Figure 7, in the embodiment shown in Figure 9, the under-vehicle cooling system of the power battery 320 formed by the cooling liquid inlet pipeline 3341, the cooling liquid outlet pipeline 3342 and the external liquid cooling equipment is connected in series with the on-vehicle cooling system of the power battery 320 formed by the first cooling circuit 331 and the second cooling circuit 332.

[0164] Among them, the first three-way valve 3343, the second three-way valve 3344, the power battery 320 and the second heat exchange channel 333b are connected to the second cooling circuit 332 in sequence, one end of the cooling liquid inlet pipeline 3341 is used to be connected to an external liquid cooling device, such as the liquid cooling device 420 shown in Figure 4, the other end of the cooling liquid inlet pipeline 3341 is connected to the second heat exchange channel 333b and one end of the power battery 320 in sequence through the first three-way valve 3343, one end of the cooling liquid outlet pipeline 3342 is used to be connected to an external liquid cooling device, such as the liquid cooling device 420 shown in Figure 4, and the other end of the cooling liquid outlet pipeline 3342 is connected to the other end of the power battery 320 through the second three-way valve 3344 to form a third cooling circuit.

[0165] Specifically, the first valve port of the first three-way valve 3343 and the first valve port of the second three-way valve 3344 are connected in sequence through the second heat exchange channel 333b of the first heat exchanger 333 and the power battery 320, the second valve port of the first three-way valve 3343 and the second valve port of the second three-way valve 3344 are connected, and the third valve port of the first three-way valve 3343 is connected to the other end of the cooling liquid inlet pipeline 3341, and the third valve port of the second three-way valve 3344 is connected to the other end of the cooling liquid outlet pipeline 3342.

[0166] In specific implementation, when the electric vehicle 300 is not connected to the liquid cooling equipment 420 outside the vehicle through the on-board charging connection device 310, the first valve port and the second valve port of the first three-way valve 3343, and the first valve port and the second valve port of the second three-way valve 3344 can be controlled to be connected, and the third valve port of the first three-way valve 3343 and the third valve port of the second three-way valve 3344 can be cut off. At this time, the thermal management system 330 can cool the power battery 320 through the on-board cooling system of the power battery 320 formed by the first cooling circuit 331 and the second cooling circuit 332.

[0167] When the electric vehicle 300 is connected to the liquid cooling equipment 420 outside the vehicle through the on-board charging connection device 310, the first valve port and the third valve port of the first three-way valve 3343, and the first valve port and the third valve port of the second three-way valve 3344 can be controlled to be connected, and the second valve port of the first three-way valve 3343 and the second valve port of the second three-way valve 3344 can be cut off. At this time, the thermal management system 330 can cool the power battery 320 at the same time through the under-vehicle cooling system of the power battery 320 formed by the cooling liquid inlet pipeline 3341, the cooling liquid outlet pipeline 3342 and the liquid cooling equipment 420 outside the vehicle, and the on-vehicle cooling system of the power battery 320 formed by the first cooling circuit 331 and the second cooling circuit 332.

[0168] In an embodiment of the present application, the off-vehicle cooling system of the power battery 320 formed by the cooling component 334 and the liquid cooling device 420 outside the vehicle can be connected in series with the on-vehicle cooling system of the power battery 320 in the thermal management system 330, so that when the power battery 320 is cooled by the liquid cooling device 420, the thermal management system 320 can simultaneously utilize the off-vehicle cooling system and the on-vehicle cooling system of the power battery 320 to cool the power battery at the same time, so as to further improve the cooling efficiency of the power battery 320, thereby helping to meet the heat dissipation requirements of the power battery 320 during high-power charging, and helping to achieve high-power charging of the electric vehicle 300.

[0169] Continuing with FIG9 , in some embodiments, to ensure reliability of the series connection between the under-vehicle cooling system and the on-vehicle cooling system of the power battery 320, the cooling assembly 334 further includes a vehicle-end shutoff valve 3347. The vehicle-end two-way shutoff valve 3347 can be connected to the second cooling circuit 332 and located between the second valve port of the first three-way valve 3343 and the second valve port of the second three-way valve 3344. It is used to open or close the second cooling circuit 332 between the second valve port of the first three-way valve 3343 and the second valve port of the second three-way valve 3344.

[0170] In a specific implementation, when the electric vehicle 300 is not connected to the external liquid cooling device 420 via the onboard charging connection device 310, the vehicle-side two-way shut-off valve 3377 can be opened to allow the thermal management system 330 to cool the power battery 320 via the onboard cooling system for the power battery 320 formed by the first cooling circuit 331 and the second cooling circuit 332. When the electric vehicle 300 is connected to the external liquid cooling device 420 via the onboard charging connection device 310, the vehicle-side two-way shut-off valve 3347 can be opened to allow the thermal management system 330 to cool the power battery 320 via the offboard cooling system for the power battery 320 formed by the serially connected cooling liquid inlet pipe 3341, the cooling liquid outlet pipe 3342, and the external liquid cooling device 420.

[0171] FIG10 is a schematic structural diagram of another on-board charging connection device 310 , a power battery 320 , and a thermal management system 330 provided in an embodiment of the present application.

[0172] Unlike the embodiments shown in Figures 7 to 9 , in the embodiment shown in Figure 10 , the cooling assembly 334 may include a cooling inlet line 3341, a cooling outlet line 3342, and a second heat exchanger 3346. The second heat exchanger 3346 may include two vehicle-end channels 3346a and 3346b, with the heat exchange channel 3346b connected to the second cooling circuit 332. One end of the cooling inlet line 3341 and one end of the cooling outlet line 3343 are each connected to an off-board liquid cooling device, such as the liquid cooling device 420 shown in Figure 4 . The other ends of the cooling inlet line 3341 and the other ends of the cooling outlet line 3342 are respectively connected to the ends of the heat exchange channel 3346a, forming a third cooling circuit. The third cooling circuit can exchange heat with the second liquid working medium flowing in the second cooling circuit 332 through the second heat exchanger 3346 to cool the power battery 320.

[0173] In a specific implementation, the liquid cooling medium transmitted by the liquid cooling device 420 can flow into the heat exchange channel 3346a of the second heat exchanger 3346 through the onboard charging connection device 310 and the cooling liquid inlet pipeline 3341. The second liquid working medium in the second cooling circuit 332 flows into the power battery 320, absorbs heat generated by the power battery 320, and then flows out of the power battery 320, thereby transferring the heat from the power battery 320 to the second cooling circuit 332. When the heated second liquid working medium is transmitted to the heat exchange channel 3346b of the second heat exchanger 3346 in the second cooling circuit 332, it can exchange heat with the liquid cooling medium flowing in the heat exchange channel 3346b through the heat exchange channel 3346b, transferring heat to the liquid cooling medium, thereby cooling the second liquid working medium.

[0174] The cooled second liquid working medium can circulate in the second cooling circuit 332 and flow back into the power battery 320. The liquid cooling medium, having absorbed heat, can flow into the onboard charging connection device 310 through the cooling liquid outlet pipe 3342. It is then transferred from the first liquid outlet port 3122 of the onboard charging connection device 310 to the liquid cooling device 420 outside the vehicle, thereby removing the heat generated by the power battery 320 from the electric vehicle 300 and cooling the power battery 320.

[0175] In an embodiment of the present application, cooling of the power battery 320 is achieved by allowing the liquid cooling medium transmitted by the liquid cooling device 420 to the thermal management system 330 to undergo heat exchange with the second liquid working fluid in the second cooling circuit 332. This can avoid the problem of the purity of the second liquid working fluid in the second cooling circuit 332 being affected by the liquid cooling medium transmitted by the liquid cooling device 420 flowing into the second cooling circuit 332, and is conducive to ensuring the cooling effect of the thermal management system 330 on the power battery 320.

[0176] FIG11 is a structural diagram of another embodiment of the present application providing a connection between an on-board charging connection device 310 , a power battery 320 , and a thermal management system 330 .

[0177] Unlike the embodiments shown in Figures 7 to 10 , in the embodiment shown in Figure 11 , the cooling assembly 334 may include a cooling inlet line 3341 and a cooling outlet line 3342, and the first heat exchanger 333 may further include a third heat exchange channel 333c. One end of the cooling inlet line 3341 and one end of the cooling outlet line 3343 are each connected to an off-board liquid cooling device, such as the liquid cooling device 420 shown in Figure 4 . The other ends of the cooling inlet line 3341 and the other ends of the cooling outlet line 3342 are respectively connected to the ends of the third heat exchange channel 333c to form a third cooling circuit. The third cooling circuit can exchange heat with the second liquid working medium flowing in the second cooling circuit 332 through the first heat exchanger 333 to cool the power battery 320.

[0178] In a specific implementation, the liquid cooling medium transmitted by the liquid cooling device 420 can flow through the onboard charging connection device 310 and the cooling liquid inlet pipeline 3341 into the intermediate heat exchange pipeline 3345, and then into the third vehicle-end channel 333c of the first heat exchanger 332 connected to the intermediate heat exchange pipeline 3345. The second liquid working medium in the second cooling circuit 332 flows into the power battery 320, absorbs heat generated by the power battery 320, and then flows out of the power battery 320, transferring the heat from the power battery 320 to the second cooling circuit 332. When the heated second liquid working medium is transmitted to the second heat exchange channel 333b of the first heat exchanger 333 in the second cooling circuit 332, it can exchange heat with the liquid cooling medium flowing in the third heat exchange channel 333c through the third heat exchange channel 333c, transferring heat to the liquid cooling medium, thereby cooling the second liquid working medium.

[0179] The cooled second liquid working medium can circulate in the second cooling circuit 332 and flow back into the power battery 320. The liquid cooling medium, having absorbed heat, can flow into the onboard charging connection device 310 through the cooling liquid outlet pipe 3342. It is then transferred from the first liquid outlet port 3122 of the onboard charging connection device 310 to the liquid cooling device 420 outside the vehicle, thereby removing the heat generated by the power battery 320 from the electric vehicle 300 and cooling the power battery 320.

[0180] In an embodiment of the present application, cooling of the power battery 320 is achieved by allowing the liquid cooling medium transmitted by the liquid cooling device 420 to the thermal management system 330 to undergo heat exchange with the second liquid working fluid in the second cooling circuit 332. This can avoid the problem of the purity of the second liquid working fluid in the second cooling circuit 332 being affected by the liquid cooling medium transmitted by the liquid cooling device 420 flowing into the second cooling circuit 332, and is conducive to ensuring the cooling effect of the thermal management system 330 on the power battery 320.

[0181] The above describes the vehicle-mounted charging connection device 310 in the charging system 200 provided in the embodiment of the present application. The following describes in detail the structure of the charging pile 400 in the charging system 200.

[0182] 12 , a charging pile 400 may include a charging device 410 and a liquid cooling device 420 .

[0183] The charging device 410 may include a charging port 411, which may be used to electrically connect to the electric vehicle 300, for example, to the vehicle-side charging input port 311 of the on-board charging connection device 310 in the electric vehicle 300 shown in FIG4 , so that the charging device 410 can output direct current to the power battery 320 through the on-board control device 410 to charge the power battery 320. In a specific implementation, the charging device 410 may include a charging host 412 and at least one charging terminal 413 electrically connected to the charging host 412. The charging port 411 may be a charging plug of a charging gun electrically connected to each charging terminal 413.

[0184] The liquid cooling device 420 may include a liquid inlet and outlet port 421 at the charging station end. The liquid inlet and outlet port 421 may be used to connect to the electric vehicle 300, for example, to the first liquid inlet and outlet port 312 of the onboard charging connection device 310 in the electric vehicle 300 shown in FIG4 . This allows the liquid cooling device 420 to transmit a liquid-phase cooling medium to the thermal management system 330 via the onboard charging connection device 310, so that the thermal management system 330 uses the liquid-phase cooling medium transmitted by the liquid cooling device 420 to cool the power battery 320. In a specific implementation, the liquid cooling device 420 may include a device body 422 and at least one liquid cooling gun connected to the device body 422. The liquid inlet and outlet port 421 may be a liquid cooling plug for each liquid cooling gun connected to the device body 422.

[0185] In an embodiment of the present application, a charging pile 400 is provided with a charging device 410 and a liquid cooling device 420, so that when the charging device 410 performs high-power charging on the electric vehicle 300, it can also use the liquid cooling device 420 to transmit a liquid-phase cooling medium to the electric vehicle 300, so that the electric vehicle 300 can use the transmitted liquid-phase cooling medium to cool the power battery 320 to meet the heat dissipation requirements of the power battery 320 during high-power charging, which is beneficial to the realization of high-power charging of the electric vehicle 300 by the charging device 410.

[0186] In some embodiments, the number of the pile-end charging interfaces 411 and the pile-end liquid inlet and outlet 421 can be one or more respectively. In one example, the number of the pile-end charging interfaces 411 is multiple, and the number of the pile-end liquid inlet and outlet 421 is one. The multiple pile-end charging interfaces 411 can be charging plugs in multiple charging guns, and the pile-end liquid inlet and outlet 421 can be liquid cooling plugs in a liquid cooling gun. In another example, the number of the pile-end charging interfaces 411 and the pile-end liquid inlet and outlet 421 can be multiple and one-to-one corresponding, and each pile-end charging interface 411 can be integrated with the corresponding pile-end liquid inlet and outlet 421 in a charging and cooling integrated composite gun. For ease of expression and understanding, the embodiment of the present application is described as follows: the number of the pile-end charging interfaces 411 is multiple, and the number of the pile-end liquid inlet and outlet 421 is one.

[0187] Continuing with FIG12 , in some embodiments, to ensure that the charging device 410 charges the electric vehicle 300 normally, the pile-end charging interface 411 may include a pile-end DC interface 4111 and a pile-end charging CC interface 4112. The pile-end DC interface 4111 may be used to output DC power to the electric vehicle 300. For example, the pile-end DC interface 4111 may be used to electrically connect to the vehicle-end DC interface 3111 shown in FIG4 to output DC power to the vehicle-end DC interface 3111, thereby charging the power battery 320 through the on-board charging connection device 310. The pile-end charging CC interface 4112 may specifically be electrically connected to the vehicle-end charging CC interface 3112 shown in FIG4 . The voltage signal of the pile-end CC interface 4112 may be used to indicate the connection status between the pile-end charging interface 411 and the electric vehicle 300, for example, it may indicate the connection status between the pile-end charging interface 411 and the vehicle-end charging input interface 311 shown in FIG4 .

[0188] In the specific implementation, referring to Figure 12, in some embodiments, the charging device 410 may also include a pile-end charging controller 414, which can be used to: detect the voltage signal of the pile-end charging CC interface 4112, and determine the connection status between the pile-end charging interface 411 and the vehicle-end charging input interface 311 based on the voltage signal of the pile-end charging CC interface 4112.

[0189] It is understood that the voltage signal of the pile-side charging CC interface 4112 can refer to the voltage value of the vehicle-side charging CC interface 4112, and different voltage values ​​represent different connection states between the pile-side charging interface 411 and the vehicle-side charging input interface 311. For example, when the pile-side charging controller 414 detects that the voltage value of the pile-side charging CC interface 4112 is 0, it can indicate that the pile-side charging interface 411 and the vehicle-side charging input interface 311 are not connected; when the pile-side charging controller 414 detects that the voltage value of the pile-side charging CC interface 4112 is 4V, it can indicate that the pile-side charging interface 411 and the vehicle-side charging input interface 311 are connected.

[0190] It is also understood that the charging controller 414 can be disposed within the charging host 412 and electrically connected to multiple power conversion devices within the charging host 412. The charging controller 414 can be used to control the multiple power conversion devices to convert AC power from the external power grid into stable DC power for output.

[0191] Continuing to refer to FIG. 12 , similarly, in some embodiments, to ensure that the liquid cooling device 420 transmits the liquid cooling medium to the vehicle-mounted charging connection device 310 normally, the pile end liquid inlet and outlet 421 may include a pile end liquid inlet interface 4211 , a pile end liquid outlet interface 4212 and a pile end CC interface 4213 .

[0192] Among them, the pile end liquid inlet interface 4211 and the pile end liquid outlet interface 4212 can be used to connect to the electric vehicle 300 respectively. The pile end liquid outlet interface 4212 can be connected to the first liquid inlet interface 3121 of the on-board charging connection device 310 shown in Figure 4, and the pile end liquid inlet interface 4211 can be connected to the first liquid outlet interface 3131 in the on-board charging connection device 310 in the electric vehicle 300 shown in Figure 4.

[0193] Specifically, the pile-end CC interface 4213 can be electrically connected to the vehicle-end cooling CC interface 3123 shown in FIG4 . The voltage signal of the pile-end CC interface 4213 can be used to indicate the connection status between the pile-end liquid inlet and outlet 421 and the electric vehicle 300, for example, it can indicate the connection status between the pile-end liquid inlet and outlet 421 and the first liquid inlet and outlet 312 of the on-board charging connection device 310 shown in FIG4 .

[0194] In specific implementation, referring to FIG. 12 , in some embodiments, the liquid cooling device 420 may further include a pile end cooling controller 423 , which may be used to detect a voltage signal of a pile end CC interface 4213 , and determine the connection status between the pile end liquid inlet and outlet 421 and the electric vehicle 300 based on the voltage signal of the pile end CC interface 4213 .

[0195] It is understood that the voltage signal of the pile-end CC interface 4213 may refer to the voltage value of the pile-end CC interface 4213, and different voltage values ​​may indicate different connection states between the pile-end liquid inlet and outlet 421 and the first liquid inlet and outlet 312. For example, when the pile-end cooling controller 423 detects that the voltage value of the pile-end CC interface 4213 is 0, it may indicate that the pile-end liquid inlet and outlet 421 and the first liquid inlet and outlet 312 are not connected; when the pile-end cooling controller 423 detects that the voltage value of the pile-end CC interface 4213 is 4V, it may indicate that the pile-end liquid inlet and outlet 421 and the first liquid inlet and outlet 312 are connected.

[0196] It can be understood that the above-mentioned judgment of the connection status between the vehicle-end charging input interface 311 and the pile-end charging output interface 411, and the connection status between the first liquid inlet and outlet 312 and the pile-end liquid inlet and outlet 421 according to the pile-end charging CC interface 4112 and the pile-end cooling CC interface 4213 will be described in detail below and will not be repeated here.

[0197] It can also be understood that the pile end cooling controller 423 can be disposed in the device body 422 and can be used to control the operation of the liquid cooling system in the device body 422 .

[0198] In other embodiments, when the liquid cooling device 420 is disposed within the charging device 410, the liquid cooling device 420 may not be provided with a separate pile-end cooling controller 423. Instead, the charging controller 414 of the charging device 410 may directly serve as the controller of the liquid cooling device 420. In other words, the charging controller 414 may also be configured to detect the voltage signal at the pile-end CC interface 4213 and, based on the voltage signal at the pile-end CC interface 4213, determine the connection status between the pile-end liquid inlet and outlet 421 and the electric vehicle 300.

[0199] The structure of the pile end liquid inlet and outlet 421 in the liquid cooling device 420 is described above. The liquid cooling system in the device body 422 connected to the pile end liquid inlet and outlet 421 in the liquid cooling device 420 will be further described below.

[0200] FIG13 is a schematic structural diagram of a device body 422 provided in an embodiment of the present application.

[0201] Referring to Figure 13, the device body 422 may include a condenser 4221, a compressor 4222, a first throttle valve 4228a, and a first heat exchanger 4223. The first heat exchanger 4223 includes a first heat exchange channel 4223a and a second heat exchange channel 4223b. The compressor 4222, the condenser 4221, the first throttle valve 4228a, and the first heat exchange channel 4223a are connected in sequence to form a first cooling circuit. The two ends of the second heat exchange channel 4223b are respectively connected to the pile end liquid inlet interface 4211 and the pile end liquid outlet interface 4212, and form a second cooling circuit with the electric vehicle 300 through the pile end liquid inlet interface 4211 and the pile end liquid outlet interface 4212. The first cooling circuit exchanges heat with the second cooling circuit through the first heat exchanger 4223 to cool the second cooling circuit, which is used to cool the electric vehicle 300.

[0202] In a specific implementation, when the liquid cooling device 420 is connected to the onboard charging connection device 310, the liquid-phase cooling medium flowing through the second heat exchange channel 4223b of the first heat exchanger 4223 can be transferred to the onboard charging connection device 310 through the charging terminal liquid outlet interface 4212, and then transferred to the thermal management system 330 through the onboard charging connection device 310, thereby exchanging heat with the power battery 320 through the thermal management system 330, thereby cooling the power battery 320. After heat exchange in the thermal management system 330, the liquid-phase cooling medium can be output through the onboard charging connection device 310 and further flow into the second heat exchange channel 4223b of the first heat exchanger 4223 through the charging terminal liquid inlet interface 4211.

[0203] The liquid-phase cooling medium in the second heat exchange channel 4223b can exchange heat with the first cooling circuit through the first heat exchange channel 4223a to transfer the heat to the first cooling circuit, thereby cooling the liquid-phase cooling medium in the second heat exchange channel 4223b. The cooled liquid-phase cooling medium in the second heat exchange channel 4223b is then transferred to the onboard charging connection device 310 through the charging terminal outlet 4212, thereby completing the cooling cycle of the power battery 320 by the liquid-phase cooling medium in the second heat exchange channel 4223b. Simultaneously, the heat-carrying cooling medium in the first cooling circuit is cooled sequentially through the compressor 4222, the condenser 4221, and the first throttle valve 4228a, completing the cooling cycle of the cooling medium in the first cooling circuit.

[0204] In an embodiment of the present application, the first heat exchange channel 4223a of the first heat exchanger 4223 can form a first cooling circuit with the condenser 4221, the compressor 4222, and the first throttle valve 4228a, and the second heat exchange channel 4223b of the first heat exchanger 4223 can form a second cooling circuit with the electric vehicle 300 through the pile end liquid inlet interface 4211 and the pile end liquid outlet interface 4212. Through the above design, the first cooling circuit can cool the liquid cooling medium in the second cooling circuit through the first heat exchanger 4223 to realize the cooling circulation of the electric vehicle 300 by the liquid cooling medium in the second cooling circuit, thereby realizing the cooling of the power battery 320 while the charging device 410 charges the power battery 320, which is beneficial to meeting the heat dissipation requirements of the power battery 320 during high-power charging, and is beneficial to the realization of high-power charging of the electric vehicle 300 by the charging device 410.

[0205] Continuing to refer to FIG. 13 , in some embodiments, the device body 422 further includes a radiator 4224 , a first three-way valve 4225 a , and a second three-way valve 4225 b .

[0206] The first three-way valve 4225a is connected between one end of the second heat exchange channel 4223b and the pile end liquid outlet port 4212, and the second three-way valve 4225b is connected between the other end of the second heat exchange channel 4223b and the pile end liquid inlet port 4211. One end of the radiator 4224 is connected to the pile end liquid outlet port 4212 via the first three-way valve 4225a, and the other end of the radiator 4224 is connected to the pile end liquid inlet port 4211 via the second three-way valve 4225b. The radiator 4224 forms a third cooling circuit with the electric vehicle 300. The liquid cooling medium in the third cooling circuit is used to cool the electric vehicle 300, and the radiator 4224 is used to air-cool the liquid cooling medium in the third cooling circuit.

[0207] Specifically, the first valve port of the first three-way valve 4225a (the right valve port of the first three-way valve 4225a shown in the figure) is connected to the pile end liquid outlet interface 4212, the second valve port of the first three-way valve 4225a (the upper valve port of the first three-way valve 4225a shown in the figure) is connected to the output end of the radiator 4224, and the third valve port of the first three-way valve 4225a (the left valve port of the first three-way valve 4225a shown in the figure) is connected to one end of the second heat exchange channel 4223b of the first heat exchanger 4223. The first valve port of the second three-way valve 4224b (the right valve port of the second three-way valve 4224b shown in the figure) is connected to the pile end liquid inlet interface 4211, the second valve port of the second three-way valve 422b (the upper valve port of the second three-way valve 4224b shown in the figure) is connected to the input end of the radiator 4224, and the third valve port of the second three-way valve 4223b (the left valve port of the second three-way valve 4224b shown in the figure) is connected to the other end of the second heat exchange channel 4223b of the first heat exchanger 4223, so that the radiator 4224 and the first heat exchanger 4223 are both connected to the first pile end liquid inlet interface 4211 and the first pile end liquid outlet interface 4212.

[0208] In specific implementation, when the liquid cooling device 420 is connected to the on-board charging connection device 310, the liquid-phase cooling medium in the third cooling circuit formed by the radiator 4224 and the electric vehicle 300 through the pile-end liquid inlet interface 4211 and the pile-end liquid outlet interface 4212 can be transmitted to the thermal management system 330 through the on-board charging connection device 310; or, the liquid-phase cooling medium in the second cooling circuit formed by the second heat exchange channel 4223b of the first heat exchanger 4223 and the electric vehicle 300 through the pile-end liquid inlet interface 4211 and the pile-end liquid outlet interface 4212 can be transmitted to the thermal management system 330 through the on-board charging connection device 310, thereby cooling the power battery 320.

[0209] In one possible example, the right valve port and the upper valve port of the first three-way valve 4225a, and the right valve port and the upper valve port of the second three-way valve 4225b can be connected, and the left valve port of the first three-way valve 4225a and the left valve port of the second three-way valve 4225b can be blocked.

[0210] In this case, the liquid-phase cooling medium in the third cooling circuit where the radiator 4224 is located can be transmitted to the onboard charging connection device 310 through the pile end liquid outlet interface 4212, and then transmitted to the thermal management system 330 through the onboard charging connection device 310, so as to exchange heat with the power battery 320 through the thermal management system 330, thereby cooling the power battery 320. The liquid-phase cooling medium in the thermal management system 330 after heat exchange can be output through the onboard charging connection device 310, and further flow into the third cooling zone circuit through the pile end liquid inlet interface 4211, and dissipate heat through the radiator 4224 through air cooling. After air cooling, the liquid-phase cooling medium in the third cooling circuit is again transmitted to the onboard charging connection device 310 through the pile end liquid outlet interface 4212, thereby completing the cooling cycle of the power battery 320 by the liquid-phase cooling medium.

[0211] In another possible example, the left valve port and the right valve port of the first three-way valve 4225a and the left valve port and the right valve port of the second three-way valve 4225b can be connected, and the upper valve port of the first three-way valve 4225a and the upper valve port of the second three-way valve 4225b can be blocked.

[0212] In this case, the liquid cooling medium in the second cooling circuit where the second heat exchange channel 4223b of the first heat exchanger 4223 is located can be transmitted to the onboard charging connection device 310 through the pile end liquid outlet interface 4212, and then heat exchange with the power battery 320 through the thermal management system 330, thereby cooling the power battery 320. The specific description can be found in the above embodiment and will not be repeated here.

[0213] In an embodiment of the present application, the radiator 4224 forms a third cooling circuit with the electric vehicle 300 through the pile end liquid inlet interface 4211 and the pile end liquid outlet interface 4212. The liquid cooling medium in the third cooling circuit can be used to cool the electric vehicle 300, and the liquid cooling medium in the third cooling circuit is naturally cooled by air through the radiator 4224, which is beneficial to reducing the overall energy consumption of the liquid cooling equipment 420.

[0214] In some embodiments, referring to FIG13 , in order to drive the liquid cooling medium in the second cooling circuit and / or the third cooling circuit to flow in the circuit, the device body 422 may further include a water pump 42211. The water pump 42211 may be connected between the right valve port of the first three-way valve 4225a and the liquid outlet interface 4212 at the pile end; or, the water pump 42211 may be connected between the right valve port of the second three-way valve 4225b and the liquid inlet interface 4211 at the pile end.

[0215] It is understandable that in the embodiment of the present application, the liquid cooling device 420 can also cool the charging device 410, for example, cooling multiple power conversion devices in the charging host 412, or cooling the charging gun electrically connected to the charging host 412.

[0216] For example, continuing to refer to FIG. 13 , in some embodiments, the device body 422 may further include a charging gun cooling circuit 4226 , a second throttle valve 4228 b , and a second heat exchanger 4227 .

[0217] The charging device 410 may also include a charging gun. The liquid-phase cooling medium that can flow through the charging gun cooling circuit 4226 can exchange heat with the charging gun, thereby cooling the charging gun. The second heat exchanger 4227 includes a third heat exchange channel 4227a and a fourth heat exchange channel 4227b. The compressor 4222, the condenser 4221, the second throttle valve 4228a, and the third heat exchange channel 4227a are connected in sequence to form a fourth cooling circuit. The fourth heat exchange channel 4227b is connected to the charging gun cooling circuit 4226, that is, the liquid-phase cooling medium in the charging gun cooling circuit 4226 can flow through the fourth heat exchange channel 4227b.

[0218] In specific implementation, when the liquid-phase cooling medium that absorbs the heat of the charging gun in the charging gun cooling circuit 4226 flows into the fourth heat exchange channel 4227b of the second heat exchanger 4227, the liquid-phase cooling medium with heat can pass through the third heat exchange channel 4227a of the second heat exchanger 4227 to exchange heat with the fourth cooling circuit to transfer the heat to the fourth cooling circuit, thereby cooling the liquid-phase cooling medium in the charging gun cooling circuit to realize the cooling cycle of the charging gun by the charging gun cooling circuit.

[0219] In an embodiment of the present application, the liquid cooling device 420 can be integrated with the charging gun cooling circuit 4226 of the charging gun through the second heat exchanger 4227, so that the liquid cooling device 420 can cool the liquid cooling medium in the charging gun cooling circuit, thereby providing a cold source for the cooling cycle of the charging gun, which is beneficial to improving the cooling performance of the charging gun.

[0220] In some embodiments, referring to FIG. 14 , the device body 422 may further include a water pump 42212 connected to the charging gun cooling circuit 4226 to drive the flow of liquid cooling medium in the charging gun cooling circuit 4226 .

[0221] FIG14 is a schematic structural diagram of another device body 422 provided in an embodiment of the present application.

[0222] It should be understood that the embodiment shown in FIG. 14 includes most of the technical features of the embodiment shown in FIG. 13 . To avoid redundancy, the following mainly describes the differences between the two.

[0223] Different from the embodiment shown in FIG. 13 , in the embodiment shown in FIG. 14 , the device body 422 may further include a four-way valve 4229 and a liquid storage tank 42210 .

[0224] The output end of compressor 4222 is connected to one end of condenser 4221 via a four-way valve 4229. The other end of condenser 4221, first throttle valve 4228a, and one end of first heat exchange channel 4223a are sequentially connected. The other end of first heat exchange channel 4223a is sequentially connected to liquid storage tank 42210 and the input end of compressor 4222 via four-way valve 4229, thereby forming a first cooling circuit. Furthermore, the output end of compressor 4222 is connected to the other end of first heat exchange channel 4223a via four-way valve 4229. One end of first heat exchange channel 4223a, first throttle valve 4228a, and the other end of condenser 4221 are sequentially connected. One end of condenser 4221 is sequentially connected to liquid storage tank 42210 and the input end of compressor 4222 via four-way valve 4229, thereby forming a first heating circuit. The first heating circuit exchanges heat with the second cooling circuit via the first heat exchanger 4223, thereby heating the second cooling circuit.

[0225] Specifically, as shown in Figure 14, the first valve port of the four-way valve 4229 (the lower valve port of the four-way valve 4229 shown in the figure) is connected to the output end of the compressor 4222, the second valve port of the four-way valve 4229 (the right valve port of the four-way valve 4229 shown in the figure) is connected to one end of the condenser 4221, the other end of the condenser 4221 is connected to one end of the first heat exchange channel 4223a through the first throttle valve 4228a, the other end of the condenser 4221 is connected to one end of the third heat exchange channel 4227a through the second throttle valve 4228b, and the other end of the condenser 4221 is also connected to the other end of the third heat exchange channel 4227a, for example, through the stop valve 42214. The other end of the first heat exchange channel 4223a is connected to the third valve port of the four-way valve 4229 (the upper valve port of the four-way valve 4229 shown in the figure), and the fourth valve port of the four-way valve 4229 (the left valve port of the four-way valve 4229 shown in the figure) is connected to the liquid storage tank 42210, and the liquid storage tank 42210 is also connected to the output end of the compressor 4222 and the other end of the third heat exchange channel 4227a. For example, the liquid storage tank 42210 is also connected to the liquid storage tank 42210 through the stop valve 42215.

[0226] In a specific implementation, when the liquid cooling device 420 is connected to the vehicle charging connection device 310 and the power battery 320 needs to be cooled, the lower valve port and the left valve port of the four-way valve 4229 can be controlled to be connected, and the upper valve port and the right valve port of the four-way valve 4229 can be controlled to be connected, so that the output end of the compressor 4222, the lower valve port of the four-way valve 4229, the left valve port of the four-way valve 4229, the condenser 4221, the first throttle valve 4228a, the first heat exchange channel 4223a, the four-way valve The upper valve port of 4229, the right valve port of the four-way valve 4229, the liquid storage tank 42210, and the input end of the compressor are connected in sequence to form the above-mentioned first cooling circuit. At the same time, the output end of the compressor 4222, the lower valve port of the four-way valve 4229, the left valve port of the four-way valve 4229, the condenser 4221, the second throttle valve 4228b, the third heat exchange channel 4227a, the liquid storage tank 42210, and the input end of the compressor 4222 are connected in sequence to form the above-mentioned third cooling circuit.

[0227] When the liquid cooling device 420 is connected to the on-board charging connection device 310 and the power battery 320 needs to be heated, the lower valve port and the upper valve port of the four-way valve 4229 can be controlled to be connected, and the left valve port and the right valve port of the four-way valve 4229 can be connected, so that the output end of the compressor 4222, the lower valve port of the four-way valve 4229, the upper valve port of the four-way valve 4229, the first heat exchange channel 4223a, the first throttle valve 4228a, the left valve port of the four-way valve 4229, the right valve port of the four-way valve 4229, the liquid storage tank 42210 and the input end of the compressor 4222 are connected in sequence to form a first heating circuit. In this way, the cooling medium, after being heated and pressurized by compressor 4222, can be transmitted through the upper valve port of four-way valve 4229 to the first heat exchange channel 4223a of the first heat exchanger 4223. Then, through the second heat exchange channel 4223b, it exchanges heat with the liquid-phase cooling medium flowing in the second heat exchange channel 4223b to heat the liquid-phase cooling medium. The heated liquid-phase heating medium is transmitted to the on-board charging connection device 310, where it exchanges heat with the power battery 320 through the thermal management system 330 to heat the power battery 320.

[0228] In the embodiment of the present application, a heating circulation pipeline is further provided in the liquid cooling device 420, so that the liquid cooling device 420 can heat the power battery 320, which is conducive to meeting the temperature requirements of the electric vehicle 300 in different scenarios.

[0229] In other embodiments, when the liquid cooling device 420 is connected to the vehicle-mounted charging connection device 310 and the power battery 320 needs to be heated, the lower valve port and the upper valve port of the four-way valve 4229 can be controlled to be connected, and the left valve port and the right valve port of the four-way valve 4229 can be connected, so that the output end of the compressor 4222, the lower valve port of the four-way valve 4229, the upper valve port of the four-way valve 4229, the first heat exchange channel 4223a, the first throttle valve 4228a, the third heat exchange channel 4227a, the stop valve 42214, the condenser 4221, the left valve port of the four-way valve 4229, the right valve port of the four-way valve 4229, the liquid storage tank 42210 and the input end of the compressor 4222 are connected in sequence to form a second heating circuit. In this way, the cooling medium, after being heated and pressurized by compressor 4222, can be transmitted to the first heat exchange channel 4223a of the first heat exchanger 4223 through the upper valve port of four-way valve 4229. It then exchanges heat with the liquid-phase cooling medium flowing in the second heat exchange channel 4223b through the second heat exchange channel 4223b to heat the liquid-phase cooling medium. The heated liquid-phase heating medium is then transmitted to the on-board charging connection device 310 to exchange heat with the power battery 320 through the thermal management system 330, thereby heating the power battery 320. In the second heating circuit, the liquid-phase heating medium can absorb heat from the charging gun cooling circuit 426 and the condenser 4221, thereby improving the heating efficiency of the power battery 320.

[0230] The above describes the specific components of the on-board charging connection device 310 and the charging pile 410 in the charging system 200 provided in the embodiment of the present application. The following, in conjunction with the accompanying drawings, further illustrates how the on-board charging connection device 310 and the charging pile 410 determine the connection status of the vehicle-side liquid inlet and outlet 312 (i.e., the first liquid inlet and outlet 312) and the pile-side liquid inlet and outlet 421, respectively, based on their respective CC interfaces.

[0231] Figures 15 and 16 are specific circuit structure diagrams of an on-board charging connection device 310 and a charging pile 410 provided in an embodiment of the present application, which respectively determine the connection status of the vehicle-end liquid inlet and outlet 312 (i.e., the first liquid inlet and outlet 312) and the pile-end liquid inlet and outlet 421 according to their respective CC interfaces.

[0232] In conjunction with Figures 2, 15, and 16, if the liquid cooling device 420 is disposed outside the charging device 410 and is connected to the vehicle-mounted charging connection device 310 via a separate liquid cooling gun, the liquid cooling interface in Figures 15 and 16 includes the charging station liquid inlet and outlet 421 and the vehicle-end liquid inlet and outlet 312 in Figure 2. The liquid cooling plug may include the charging station liquid inlet and outlet 421, and the liquid cooling socket may include the vehicle-end liquid inlet and outlet 312.

[0233] Specifically, in combination with Figures 4, 15 and 16, the liquid cooling socket includes a first liquid inlet interface 3121, a first liquid outlet interface 3122 and a vehicle-end cooling CC interface 3123. In combination with Figure 12, the liquid cooling plug includes a pile-end liquid inlet interface 4211, a pile-end liquid outlet interface 4212 and a pile-end cooling CC interface 4213.

[0234] In some embodiments, the liquid cooling device 420 includes a pile-end cooling CC circuit, which can be electrically connected to a pile-end cooling controller 423 and a pile-end cooling CC interface 4213, respectively. The pile-end cooling controller 423 uses the pile-end cooling CC circuit to determine the voltage signal at the pile-end cooling CC interface 4213, thereby determining the connection status between the liquid-cooled plug and the liquid-cooled socket. The onboard charging connection device 310 includes a vehicle-end cooling CC circuit, which is electrically connected to an onboard charging connection controller 315 and a vehicle-end cooling CC interface 3123, respectively. The onboard charging connection controller 315 uses the vehicle-end cooling CC circuit to determine the voltage signal at the vehicle-end cooling CC interface 3123, thereby determining the connection status between the liquid-cooled plug and the liquid-cooled socket.

[0235] Specifically, as shown in Figure 15 , the pile-end cooling CC circuit includes a first pile-end cooling CC circuit, which includes a first pile-end resistor unit R3. The pile-end cooling CC interface 4213 includes a first pile-end cooling CC interface, which corresponds to the plug of the CC2 interface shown in the figure. The first pile-end cooling CC interface is grounded through the first pile-end resistor unit R3. The vehicle-end cooling CC circuit includes a first vehicle-end cooling CC circuit, which includes a first vehicle-end resistor unit R5 and a vehicle-end voltage source U2. The vehicle-end cooling CC interface 3123 includes a first vehicle-end cooling CC interface, which corresponds to the plug of the CC2 interface shown in the figure. The first vehicle-end cooling CC interface is electrically connected to the vehicle-end voltage source U2 via the first vehicle-end resistor unit R5. The voltage signal of the first vehicle-end cooling CC interface is the voltage signal of detection point 2.

[0236] Before the liquid-cooling socket is connected to the liquid-cooling plug, since detection point 2 is connected to vehicle-end voltage source U2, the voltage at detection point 2 should be the voltage output by vehicle-end voltage source U2. Only when the liquid-cooling socket is connected to the liquid-cooling plug does vehicle-end voltage source U2 form a loop through the first vehicle-end resistor unit R5, the first pile-end resistor unit R3, and the ground wire in the liquid-cooling device. Due to the voltage divider function of the resistors, the voltage at detection point 2 will reach the first vehicle-end preset value.

[0237] For example, if the vehicle-side voltage source U2 outputs a voltage of 12 V and the resistances of R3 and R5 are equal, the first vehicle-side preset value is 6 V. In this design, if the voltage at detection point 2 is 6 V, the on-board charging connection device recognizes that the liquid cooling socket and liquid cooling plug are connected.

[0238] For another example, if the vehicle-side voltage source U2 outputs 12V, but the resistance values ​​of R3 and R5 are different (e.g., R3 is 2Ω and R5 is 4Ω), then the first vehicle-side preset value is 4V. In this design, if the voltage at detection point 2 is 4V, the on-board charging connection device recognizes that the liquid cooling socket and liquid cooling plug are connected.

[0239] Therefore, based on the above analysis, when the voltage at detection point 2 is the voltage output by voltage source U2, the on-board charging connection device can identify that the liquid-cooled socket is not connected to the liquid-cooled plug. When the voltage at detection point 2 reaches the first vehicle-side preset value, the on-board charging connection device can identify that the liquid-cooled socket is connected to the liquid-cooled plug.

[0240] In the embodiment of the present application, since the first vehicle-end cooling CC interface is electrically connected to the vehicle-end voltage source in the onboard charging connection device 310, when the voltage value of the first vehicle-end cooling CC interface reaches the voltage value of the vehicle-end voltage source, it indicates that the pile-end liquid inlet and outlet 421 and the vehicle-end liquid inlet and outlet 312 are not connected. When the voltage value of the first vehicle-end cooling CC interface reaches the first vehicle-end preset value, the onboard charging connection device 310 can identify that the pile-end liquid inlet and outlet 421 and the vehicle-end liquid inlet and outlet 312 are connected. Identifying the connection status of the pile-end liquid inlet and outlet 421 and the vehicle-end liquid inlet and outlet 312 by the voltage value of the first vehicle-end cooling CC interface can improve the accuracy of the onboard charging connection device 310 in identifying the connection status of the pile-end liquid inlet and outlet 421 and the vehicle-end liquid inlet and outlet 312, thereby meeting the heat dissipation requirements of the power battery 320 during high-power charging and facilitating the charging device 410 to achieve high-power charging of the electric vehicle 300.

[0241] In some embodiments, as shown in FIG16 , the pile-end cooling CC circuit further includes a second pile-end cooling CC circuit, which includes a second pile-end resistor unit R1 and a pile-end voltage source U1. The pile-end cooling CC interface further includes a second pile-end cooling CC interface, which corresponds to the plug of the CC1 interface shown in the figure and is electrically connected to the pile-end voltage source U1 via the second pile-end resistor unit R1. The vehicle-end cooling CC circuit further includes a second vehicle-end cooling CC circuit, which also includes a second vehicle-end resistor unit R4. The vehicle-end cooling CC interface 3123 further includes a second vehicle-end cooling CC interface, which is grounded via the second vehicle-end resistor unit R4. The voltage signal of the second vehicle-end cooling CC interface is the voltage signal of detection point 3, and the voltage signal of the second pile-end cooling CC interface is the voltage signal of detection point 1.

[0242] Before the liquid-cooled socket is connected to the liquid-cooled plug, the voltage at detection point 3 should be 0V because it is connected to the vehicle's electrical platform (i.e., grounded). Only when the liquid-cooled socket is connected does the base-end voltage source U1 form a loop through the second base-end resistor unit R1, the second vehicle-end resistor unit R4, and the ground wire in the on-board charging connection device. Due to the voltage divider function of the resistors, the voltage at detection point 3 reaches the second vehicle-end preset value.

[0243] For example, if the output voltage of the charging terminal voltage source U1 is set to 12V and the resistance values ​​of R1 and R4 are equal, the second vehicle-side preset value is 6V. In this design, if the voltage at detection point 3 is 6V, the on-board charging connection device recognizes that the liquid cooling socket and liquid cooling plug are connected.

[0244] For another example, if the output voltage of the charging-side voltage source U1 is still set to 12V, but the resistance values ​​of R1 and R4 are different, such as R1 is 2Ω and R4 is 4Ω, then the second vehicle-side preset value is 8V. In this design, if the voltage at detection point 3 is 8V, the on-board charging connection device recognizes that the liquid cooling socket and liquid cooling plug are connected.

[0245] Therefore, based on the above analysis, when the voltage at detection point 2 is the voltage output by voltage source U2 and the voltage at detection point 3 is 0V, the on-board charging connection device can identify that the liquid-cooled socket is not connected to the liquid-cooled plug. When the voltage at detection point 2 reaches the first vehicle-side preset value and the voltage at detection point 3 reaches the second vehicle-side preset value, the on-board charging connection device can identify that the liquid-cooled socket and the liquid-cooled plug are successfully connected.

[0246] Similarly, before the liquid-cooled socket is connected to the liquid-cooled plug, since detection point 1 is connected to the base-end voltage source U1, the voltage at detection point 1 should be the voltage output by base-end voltage source U1. Only when the liquid-cooled socket is connected to the liquid-cooled plug does the current from base-end voltage source U1 form a loop through the second base-end resistor unit R1, the second vehicle-end resistor unit R4, and the ground wire in the on-board charging connection device. Because detection point 1 is located between the second base-end resistor unit R1 and the second vehicle-end resistor unit R4, the voltage at detection point 1 will reach the first base-end preset value due to the voltage divider function of the resistors.

[0247] For example, if the output voltage of the terminal voltage source U1 is set to 12V and the resistance values ​​of R1 and R4 are equal, the first terminal preset value is 6V. In this design, if the voltage at detection point 1 is 6V, the liquid cooling device recognizes that the liquid cooling socket and liquid cooling plug are connected.

[0248] For another example, if the output voltage of the terminal voltage source U1 is still set to 12V, but the resistance values ​​of R1 and R4 are different, such as R1 is 2Ω and R4 is 4Ω, then the first terminal preset value is 8V. In this design, if the voltage at detection point 1 is 8V, the liquid cooling device recognizes that the liquid cooling socket and liquid cooling plug are connected.

[0249] Based on the above analysis, when the voltage at detection point 1 is the voltage output by the pile-end voltage source U1, the liquid cooling device can identify that the liquid cooling socket is not connected to the liquid cooling plug. When the voltage at detection point 1 is the first pile-end preset value, the liquid cooling device can identify that the liquid cooling socket is successfully connected to the liquid cooling plug.

[0250] In the embodiment of the present application, since the second pile-end cooling CC circuit is electrically connected to the pile-end voltage source in the charging pile, when the voltage value of the second pile-end cooling CC interface is the output voltage value of the pile-end voltage source, it indicates that the pile-end liquid inlet and outlet 421 and the vehicle-end liquid inlet and outlet 312 are not connected. When the voltage value of the second pile-end cooling CC interface reaches the first pile-end preset value, the liquid cooling device 420 can identify that the pile-end liquid inlet and outlet 421 and the vehicle-end liquid inlet and outlet 312 are connected. By identifying the connection status of the pile-end liquid inlet and outlet 421 and the vehicle-end liquid inlet and outlet 312 through the voltage value of the second pile-end cooling CC interface, the accuracy of the liquid cooling device 420 in identifying the connection status of the pile-end liquid inlet and outlet 421 and the vehicle-end liquid inlet and outlet 312 can be improved, thereby meeting the heat dissipation requirements of the power battery 320 during high-power charging, and facilitating the charging device 410 to achieve high-power charging of the electric vehicle 300.

[0251] In some embodiments, referring to FIG16 , the second pile end cooling CC circuit further includes a normally closed switch S. The second pile end cooling CC interface is electrically connected to the second pile end resistance unit R1 via the normally closed switch S. The detection between the second pile end resistance unit R1 and the normally closed switch S is detection point 1.

[0252] Before the liquid-cooled socket is connected to the liquid-cooled plug, since detection point 1 is connected to the pile-end voltage source U1 and switch S is a normally closed switch, the voltages at detection points 1 and 4 should both be the voltage output by pile-end voltage source U1. Only when the liquid-cooled socket is connected to the liquid-cooled plug does the current from pile-end voltage source U1 form a loop through the second pile-end resistor unit R1, the second vehicle-end resistor unit R4, and the ground wire of the on-board charging connection device. Since detection point 1 is located between resistors R1 and R4, the voltages at detection points 1 and 4 will only reach the first pile-end preset value due to the voltage divider function of the resistors. Alternatively, the liquid-cooled socket is connected to the liquid-cooled plug, but switch S is off. In this case, detection point 1 is connected to pile-end voltage source U1, and detection point 4 is connected to the ground wire in the on-board charging connection device 310, resulting in the voltage at detection point 1 being the voltage output by pile-end voltage source U1 and the voltage at detection point 4 being 0V.

[0253] For example, if the output voltage of voltage source U1 is set to 12V and the resistance values ​​of R1 and R4 are equal, the preset value of the first terminal is 6V. In this design, if the voltage at test point 1 is 6V, the liquid cooling device recognizes that the liquid cooling socket and liquid cooling plug are successfully connected. If the voltage at test point 1 is 12V and the voltage at test point 4 is 0V, it indicates that the liquid cooling socket and liquid cooling plug are connected, but switch S is disconnected.

[0254] For another example, let's assume that voltage source U1 still outputs 12V, but the resistance values ​​of R1 and R4 are different—for example, R1 is 2Ω and R4 is 4Ω—then the default value at the terminal is 8V. In this design, if the voltage at test point 1 is 8V, the liquid cooling device recognizes that the liquid cooling socket and liquid cooling plug are connected. If the voltage at test point 1 is 12V and the voltage at test point 4 is 0V, the liquid cooling socket and liquid cooling plug are connected, but switch S is disconnected.

[0255] Based on the above analysis, when the voltage at detection points 1 and 4 is the voltage output by voltage source U1, the liquid cooling device can identify that the liquid cooling socket is not connected to the liquid cooling plug. When the voltage at detection points 1 and 4 is the first terminal preset value, the liquid cooling device can identify that the liquid cooling socket and the liquid cooling plug are successfully connected. When the voltage at detection point 1 is the voltage output by voltage source U1 and the voltage at detection point 4 is 0V, the liquid cooling device identifies that the liquid cooling socket and the liquid cooling plug are connected but switch S is in the off state.

[0256] In an embodiment of the present application, the liquid cooling device 420 can identify the connection status of the pile-end liquid inlet and outlet 421 and the vehicle-end liquid inlet and outlet 312 based on the voltage value of the second pile-end cooling CC interface, further combined with the voltage value of the detection point between the normally closed switch and the second pile-end resistance unit, so as to further improve the accuracy of the liquid cooling device in identifying the connection status of the pile-end liquid inlet and outlet 421 and the vehicle-end liquid inlet and outlet 312.

[0257] The above describes how to determine the connection status of the liquid-cooled plug and the liquid-cooled socket through the on-board charging connection device 310 and the liquid cooling device 420 respectively. For determining the connection status of the charging socket and the charging plug corresponding to the pile-end charging output interface 411 and the vehicle-end charging input interface 311, reference can be made to relevant standards, including 2015, 2015+, and supercharging.

[0258] The following describes a charging method provided in an embodiment of the present application that can be applied to the charging system 200.

[0259] FIG17 is a flow chart of a charging method 500 provided in an embodiment of the present application. The charging method 500 can be applied to the aforementioned charging system 200 , which includes an on-board charging connection device 310 and a charging pile 400 , and the on-board charging connection device 310 is applied to an electric vehicle 300 .

[0260] It should be understood that the description of the method embodiment corresponds to the description of the above-mentioned structural embodiment. Therefore, for the contents not described in detail, reference can be made to the above-mentioned device embodiment and will not be repeated below.

[0261] 17 , the charging method 500 may include:

[0262] In S501 and S501 ′, the vehicle-mounted charging connection device 310 and the charging pile 400 may respectively determine the connection status between the electric vehicle 300 and the charging device 410 in the charging pile 400 .

[0263] For example, in conjunction with Figures 4 and 12 , the vehicle-side charging input interface 311 in the on-board charging connection device 310 can be a charging socket, and the charging pile-side charging output interface 411 in the charging device 410 can be a charging plug. When the on-board charging connection device 310 and the charging pile 400 detect that the charging socket and the charging plug are plugged in, the on-board charging connection device 310 can detect the voltage signal of the vehicle-side charging CC interface 3112 in the vehicle-side charging input interface 311, and the charging pile 400 can detect the voltage signal of the pile-side charging CC interface 4112 in the pile-side charging output interface 411. The on-board charging connection device 310 and the charging pile 400 can determine the connection status of the vehicle-side charging input interface 311 and the pile-side charging output interface 411 based on the detected voltage signals, that is, determine the connection status of the electric vehicle 300 and the charging device 410.

[0264] In S502 and S502', when the on-board charging connection device 310 and the charging pile 400 each determine that the electric vehicle 300 is connected to the charging device 410, the on-board charging connection device 310 and the charging pile 400 can each determine the connection status of the electric vehicle 300 and the liquid cooling device 420 in the charging pile 400.

[0265] For example, in conjunction with Figures 4 and 12, the pile-end liquid inlet and outlet 421 in the liquid cooling device 420 can be a liquid cooling plug, and the first liquid inlet and outlet 312 in the on-board charging connection device 310 can be a liquid cooling socket. When the on-board charging connection device 310 and the charging pile 400 detect that the liquid cooling socket and the liquid cooling plug are plugged in, the on-board charging connection device 310 can detect the voltage signal of the vehicle-end cooling CC interface 3123 in the first liquid inlet and outlet 312, and the charging pile 400 can detect the voltage signal of the pile-end cooling CC interface 4213 in the pile-end liquid inlet and outlet 421. The connection status of the first liquid inlet and outlet 312 and the pile-end liquid inlet and outlet 421 can be determined based on the detected voltage signals, that is, the connection status of the electric vehicle 300 and the liquid cooling device 420 can be determined.

[0266] It can be understood that the above-mentioned order of determining the connection status is merely illustrative, and the on-board charging connection device 310 and the charging pile 400 may first determine the connection status between the electric vehicle 300 and the liquid cooling device 420, and then determine the connection status between the electric vehicle 300 and the charging device 410; or, the on-board charging connection device 310 and the charging pile 400 may simultaneously determine the connection status between the electric vehicle 300 and the liquid cooling device 420, and the connection status between the electric vehicle 300 and the charging device 410.

[0267] At step S503 , based on the connection between the electric vehicle 300 and the charging device 410 and the liquid cooling device 420 , the onboard charging connection device 310 may send a supercharge request message to the charging pile 400 . The supercharge request message is used to instruct the charging device 410 to charge the electric vehicle 300 at a first output power greater than or equal to a preset power.

[0268] Specifically, with reference to FIG4 , in some embodiments, based on the electric vehicle 300 being connected to the charging device 410 and the liquid cooling device 420, the on-board charging connection device 310 may receive a charging request message sent by the vehicle controller 341 of the electric vehicle 300. The charging request message is used to indicate the charging power required to charge the power battery 320 in the electric vehicle 300, and may specifically instruct the charging device 410 to charge the electric vehicle 300 at a first output power.

[0269] It is understandable that the charging request message can be sent by the battery management system 342 of the electric vehicle 300 to the vehicle controller 341, and then sent by the vehicle controller 341 to the on-board charging connection device 310. Alternatively, in other embodiments, based on the fact that the electric vehicle 300 and the charging device 410 are already connected and the electric vehicle 300 and the liquid cooling device 420 are already connected, the on-board charging connection device 310 can directly receive the charging request message sent by the battery management system 342 of the electric vehicle 300.

[0270] It is also understood that in the embodiment of the present application, when the charging power required to charge the power battery 320 in the electric vehicle 300, that is, the first output power, is greater than or equal to the preset power, it can be referred to as supercharging the electric vehicle 300; when the charging power required to charge the power battery 320 in the electric vehicle 300, that is, the first output power, is less than the preset power, it can be referred to as fast charging the electric vehicle 300. The preset power can be, for example, 250 kW.

[0271] Correspondingly, after receiving the supercharging request message, the charging pile 400 can control the charging device 410 to charge the electric vehicle 300 at the first output power.

[0272] In an embodiment of the present application, when the charging power required for charging the power battery 320 in the electric vehicle 300 is high, for example, when the required power is a supercharging power greater than a preset power, the on-board charging connection device 310 sends the power required by the power battery 320 to the charging pile 400 when the charging device 410 and the liquid cooling device 420 in the electric vehicle 300 and the charging pile 400 are both connected, so that the charging device 410 can use the liquid cooling device 420 to transmit liquid cooling medium to the electric vehicle 300 while performing high-power charging on the power battery 320, so as to meet the heat dissipation requirements of the power battery 320 during high-power charging, which is conducive to the realization of high-power charging of the electric vehicle 300 by the charging device 410.

[0273] It will be appreciated that in the above-described charging method 500, in conjunction with FIG12 , the steps on the charging pile 400 side can be specifically performed by the pile-end controller in the charging pile 400. The pile-end controller can include the pile-end charging controller 414 in the charging device 410 and the pile-end cooling controller 423 in the liquid cooling device 420. In one example, the pile-end cooling controller 423 can be integrated into the pile-end charging controller 414. In conjunction with FIG4 , the steps on the vehicle-mounted charging connection device 310 side can be specifically performed by the vehicle-mounted charging connection controller 315 in the vehicle-mounted charging connection device 310.

[0274] The charging method 500 provided in the embodiment of the present application is further described in detail below in conjunction with Figure 18.

[0275] FIG18 is a flow chart of another charging method 500 provided in an embodiment of the present application, wherein the charging method 500 can be applied to the charging system 200 described above.

[0276] 18 , the charging method 500 may include:

[0277] In S501 and S501 ′, the vehicle-mounted charging connection device 310 and the charging pile 400 may respectively determine the connection status between the electric vehicle 300 and the charging device 410 in the charging pile 400 .

[0278] In S502 and S502', when the on-board charging connection device 310 and the charging pile 400 each determine that the electric vehicle 300 is connected to the charging device 410, the on-board charging connection device 310 and the charging pile 400 can each determine the connection status of the electric vehicle 300 and the liquid cooling device 420 in the charging pile 400.

[0279] For detailed descriptions of S501, S501', S502 and S502', please refer to the embodiment shown in FIG19, which will not be repeated here.

[0280] In one possible case, in S502 and S502 ′, if the onboard charging connection device 310 and the charging pile 400 respectively determine that the electric vehicle 300 is not connected to the liquid cooling device 420 , the onboard charging connection device 310 executes S503 .

[0281] S503 , based on the fact that the electric vehicle 300 and the charging device 410 are connected and the electric vehicle 300 and the liquid cooling device 420 are not connected, the on-board charging connection device 310 may send a first connection status indication message to the vehicle controller 341 of the electric vehicle 300 .

[0282] The first connection status indication message is used to indicate that the electric vehicle 300 and the charging device 410 are connected, and the on-board charging connection device 310 determines that the electric vehicle 300 and the liquid cooling device 420 are not connected.

[0283] S504 : The vehicle controller 341 sends a charging request message to the onboard charging connection device 310 based on the received first connection status indication message.

[0284] The charging request message is used to indicate the charging power required to charge the power battery 320 in the electric vehicle 300, specifically instructing the charging device 410 to charge the electric vehicle 300 at a first output power, wherein the first output power is greater than or equal to a preset power.

[0285] S505: After receiving the charging request message, the onboard charging connection device 310 sends a fast charging request message to the charging pile 400 based on the fact that the liquid cooling device 420 is not connected to the electric vehicle 300. The fast charging request message is used to instruct the charging device 410 to charge the electric vehicle 300 at an output power lower than the preset power.

[0286] Accordingly, after receiving the fast charge request message, the charging pile 400 can control the charging device 410 to charge the electric vehicle 300 with an output power less than the preset power.

[0287] In the embodiment of the present application, when the charging power required to charge the power battery 320 in the electric vehicle 300 is high, for example, when the required power is a supercharge power greater than a preset power, if the electric vehicle 300 and the liquid cooling device 420 in the charging pile 400 are not connected, the on-board charging connection device 310 can request a lower charging power from the charging pile 400, such as a fast charging power less than a preset power. This can avoid the problem of overheating of the power battery 320 due to the charging power of the charging device 410 being too high, and is conducive to ensuring that the charging device 410 charges the power battery 320 normally through the on-board charging connection device 310.

[0288] In another possible case, in S502 and S502 ′, if the onboard charging connection device 310 and the charging pile 400 respectively determine that the electric vehicle 300 is connected to the liquid cooling device 420 , the onboard charging connection device 310 executes S506 .

[0289] In step S506, based on the connection between the electric vehicle 300 and the charging device 410 and the liquid cooling device 420, the onboard charging connection device 310 may send a second connection status indication message to the vehicle controller 341 of the electric vehicle 300. The second connection status indication message is used to indicate that the electric vehicle 300 and the charging device 410 are connected and that the onboard charging connection device 310 determines that the electric vehicle 300 and the liquid cooling device 420 are connected.

[0290] S507 : The vehicle controller 341 sends a charging request message and a temperature request message to the onboard charging connection device 310 based on the received second connection status indication message.

[0291] The charging request message is used to instruct the charging device 410 to charge the power battery 320 of the electric vehicle 300 at a first output power, where the first output power is greater than or equal to a preset power. The temperature request message is used to indicate the temperature requirement information of the electric vehicle 300, such as the flow rate and temperature of the liquid cooling medium required to cool the power battery 320 when charging at the first output power.

[0292] S508, the on-board charging connection device 310 receives an authentication message sent by the charging pile 400, which is used to indicate whether the charging device 410 has the function of outputting power greater than or equal to the preset power, that is, the authentication message is used to indicate whether the charging device has the function of supercharging the power battery 320.

[0293] S509 , the vehicle-mounted charging connection device 310 determines whether the charging device 410 has a function of outputting power greater than a preset power based on the received authentication message. If not, execute S510 .

[0294] S510. After receiving the charging request message and temperature request message sent by the vehicle controller 341, the on-board charging connection device 310 sends a fast charging request message and a temperature request message to the charging pile 400 based on the indication of the authentication message that the charging device 410 does not have the function of outputting power greater than or equal to the preset power, that is, the charging device does not have the function of supercharging the power battery 320.

[0295] Correspondingly, after receiving the fast charging request message and the temperature request message, the charging pile 400 can control the charging device 410 to charge the power battery 320 with an output power less than the preset power, and control the liquid cooling device 420 to transmit liquid cooling medium to the electric vehicle 300 according to the temperature requirement information of the electric vehicle 300 indicated by the temperature request message, so as to cool the power battery 320 during charging.

[0296] In the embodiment of the present application, when the charging power required to charge the power battery 320 in the electric vehicle 300 is high, for example, when the required power is a supercharge power greater than a preset power, if the charging device 410 in the charging pile 400 does not have a supercharge function, the on-board charging connection device 310 can request a lower charging power from the charging pile 400, such as a fast charge power less than the preset power, so that the charging device 410 can charge the power battery 320. In addition, the liquid cooling device 420 can also transmit a liquid cooling medium to the electric vehicle 300 according to the instructions of the on-board charging connection device 310, which is conducive to improving the cooling performance of the power battery 320 during fast charging.

[0297] In some embodiments, the charging method 500 may further include: if the on-board charging connection device 310 determines, based on the received authentication message, that the charging device 410 has the function of outputting power greater than a preset power, the on-board charging connection device 310 may, after receiving the charging request message and the temperature request message sent by the vehicle controller 341, directly send a supercharge request message and a temperature request message to the charging pile 400 at the same time. The supercharge message request is used to instruct the charging device 410 to charge the electric vehicle 300 at the first output power.

[0298] Correspondingly, after receiving the supercharging request message and the temperature request message, the charging pile 400 can control the charging device 410 to charge the power battery 320 at the first output power, and control the liquid cooling device 420 to transmit liquid cooling medium to the electric vehicle 300 according to the temperature requirement information of the electric vehicle 300 indicated by the temperature request message, so as to cool the power battery 320 during charging.

[0299] In the embodiment of the present application, when the charging power required to charge the power battery 320 in the electric vehicle 300 is high, for example, when the required power is a supercharge power greater than a preset power, if the charging device 410 in the charging pile 400 has a supercharge function, the on-board charging connection device 310 can transmit the power required by the power battery to the charging pile 400, allowing the charging device 410 to perform high-power charging of the power battery 320. In addition, the liquid cooling device 420 can also transmit liquid cooling medium to the electric vehicle 300 according to the instructions of the on-board charging connection device 310 to meet the heat dissipation requirements of the power battery 320 during high-power charging, thereby facilitating the charging device 410 to perform high-power charging of the electric vehicle 300.

[0300] In other embodiments, if the on-board charging connection device 310 determines, based on the received authentication message, that the charging device 410 has the function of outputting power greater than the preset power, the on-board charging connection device 310 may, after receiving the charging request message and the temperature request message sent by the vehicle controller 341, first send a temperature request message to the charging pile 400, and then send a supercharge request message to the charging pile 400, that is, execute S511 to S513.

[0301] S511, after receiving the charging request message and temperature request message sent by the vehicle controller 341, the on-board charging connection device 310 sends a temperature request message to the charging pile 400 based on the charging device 410 indicated by the authentication message, which indicates that the charging device has the function of outputting power greater than or equal to the preset power, that is, the charging device does not have the function of supercharging the power battery 320.

[0302] Correspondingly, after receiving the temperature request message sent by the on-board charging connection device 310, the charging pile 400 can control the liquid cooling device 420 to transmit liquid cooling medium to the electric vehicle 300 according to the temperature requirement information of the electric vehicle 300 indicated by the temperature request message to cool the power battery 320.

[0303] S512: The vehicle-mounted charging connection device 310 may monitor the liquid cooling medium transmitted by the liquid cooling device 420 and determine whether the transmitted liquid cooling medium satisfies the temperature request information of the electric vehicle 300 indicated by the temperature request message. If so, S513 is executed.

[0304] For example, in a specific implementation, in combination with Figure 4, the on-board charging connection device 310 can monitor the temperature of the liquid-phase cooling medium transmitted by the liquid cooling device 420 at the first liquid inlet interface 3121 through the temperature sensor 319 of the first liquid inlet interface to determine whether the transmitted liquid-phase cooling medium meets the temperature request information of the electric vehicle 300.

[0305] S513 , based on the information that the liquid cooling medium transmitted by the liquid cooling device 420 meets the temperature requirement of the electric vehicle 300 , the onboard charging connection device 310 sends a supercharging request message to the charging pile 400 .

[0306] Correspondingly, after receiving the supercharge request message, the charging pile 400 can control the charging device 410 to charge the power battery 320 at the first output power.

[0307] In an embodiment of the present application, when the charging power required to charge the power battery 320 in the electric vehicle 300 is high, for example, when the required power is a supercharge power greater than a preset power, the on-board charging connection device 310 can first send a temperature request message to the charging pile 400, so that the liquid cooling device 420 in the charging pile 400 first transmits a liquid-phase cooling medium to the electric vehicle 300. After the transmitted liquid-phase cooling medium meets the temperature requirement of the electric vehicle 300, the supercharge request message is sent to the charging pile 400, so that the charging device performs high-power charging on the power battery 320. This helps to further ensure that the liquid-phase cooling medium transmitted by the liquid cooling device 420 meets the heat dissipation requirement of the power battery 320 during high-power charging, and facilitates the high-power charging of the electric vehicle 300 by the charging device 410.

[0308] In some embodiments, the charging method 500 may further include: based on the electric vehicle 300 and the charging device 410 being connected and the electric vehicle 300 and the liquid cooling device 420 being connected, the on-board charging connection device 310 may control the conduction of the power transmission circuit between the electric vehicle 300 and the charging device 410 and monitor the temperature of the power transmission circuit.

[0309] For example, in a specific implementation, referring to FIG4 , the on-board charging connection device 310 can control the charging circuit contactor 351 in the high-voltage distribution unit 350 to close based on the connection between the electric vehicle 300 and the charging device 410 and the connection between the electric vehicle 300 and the liquid cooling device 420, thereby conducting the power transmission circuit between the electric vehicle 300 and the charging device 410. Furthermore, the on-board charging connection device 310 can monitor the temperature of the power transmission circuit electrically connected to the vehicle-side DC interface 3111 via the vehicle-side DC interface temperature sensor 316.

[0310] In some embodiments, the charging method 500 may also include the on-board charging connection device 310 sending a power limit request message to the charging pile 400 when the temperature of the power transmission circuit between the electric vehicle 300 and the charging device 410 is greater than a preset temperature. The power limit request message is used to instruct the charging device 410 to reduce the output power.

[0311] Correspondingly, after receiving the power limit request message sent by the onboard charging connection device 310 , the charging pile 400 controls the charging device 410 to reduce the output power.

[0312] In an embodiment of the present application, the on-board charging connection device 310 can monitor the temperature of the power transmission circuit in real time, and instruct the charging device 410 to reduce the output power when the temperature is abnormal, which is conducive to further meeting the temperature requirements of the power battery 320 during charging and ensuring that the charging device 410 charges the power battery 320 normally.

[0313] FIG19 is a flow chart of a charging method 600 provided in an embodiment of the present application. The charging method 600 may be executed by the vehicle-mounted charging connection device 310 , and specifically by the vehicle-mounted charging connection controller 315 in the vehicle-mounted charging connection device 310 .

[0314] 19 , the charging method 600 may include:

[0315] S610 , determining the connection status between the electric vehicle 300 and the charging device, and the connection status between the electric vehicle 300 and the external liquid cooling device. For example, determining the connection status between the electric vehicle 300 and the charging device 410 and the liquid cooling device 420 in the charging pile 400 .

[0316] For example, in conjunction with Figures 4 and 12 , the vehicle-side charging input interface 311 and the first liquid inlet and outlet 312 in the vehicle-mounted charging connection device 310 can be, for example, a charging socket and a liquid cooling socket, respectively. When the vehicle-mounted charging connection controller 315 detects that the charging socket is plugged into the charging device 410 and the liquid cooling socket is plugged into the liquid cooling device 420, it can detect the voltage signal of the vehicle-side charging CC interface 3112 in the vehicle-side charging input interface 311 and the voltage signal of the vehicle-side cooling CC interface 3123 in the first liquid inlet and outlet 312, respectively, and determine the connection status between the electric vehicle 300 and the charging device 410 and the liquid cooling device 420 in the charging pile 400 based on the detected voltage signals.

[0317] S620 : Send a supercharge request message to the charging device based on the fact that the electric vehicle 300 is connected to the charging device and the electric vehicle 300 is connected to the external liquid cooling device.

[0318] The supercharge request message is used to instruct the charging device to charge the electric vehicle at a first output power, and the first output power is greater than or equal to a preset power.

[0319] For details about the charging method not specified in detail, please refer to the relevant description of the charging method 500 mentioned above, which will not be repeated here.

[0320] In an embodiment of the present application, when the charging power required to charge the power battery 320 in the electric vehicle 300 is high, for example, when the required power is a supercharging power greater than a preset power, the on-board charging connection device 310 sends the power required by the power battery 320 to the charging device when the electric vehicle 300 and the charging device and the external liquid cooling device are all connected. This allows the charging device to perform high-power charging on the power battery 320 while also utilizing the external liquid cooling device to transmit liquid-phase cooling medium to the electric vehicle 300, thereby meeting the heat dissipation requirements of the power battery 320 during high-power charging, thereby facilitating the charging device to achieve high-power charging of the electric vehicle 300.

[0321] FIG20 is a flow chart of a charging method 700 provided in an embodiment of the present application. The charging method 700 may be executed by the charging pile 400, specifically by a pile-end controller in the charging pile 400, such as the pile-end charging controller 414 in the charging device 410 and the pile-end cooling controller 423 in the liquid cooling device 420.

[0322] 20 , the charging method 700 may include:

[0323] S710: Based on the connection between the electric vehicle 300 and the charging device 410 in the charging pile 400, and the connection between the electric vehicle 300 and the liquid cooling device 420 in the charging pile 400, a supercharge request message is sent to the charging pile 400. The supercharge request message is used to instruct the charging device to charge the electric vehicle at a first output power, where the first output power is greater than or equal to a preset power.

[0324] For example, in conjunction with Figures 4 and 12 , the pile-end charging output interface 411 in the charging device 410 can be a charging plug, and the pile-end liquid inlet and outlet 421 in the liquid cooling device 420 can be a liquid cooling plug. When the pile-end controller detects that both the charging plug and the liquid cooling plug are plugged into the on-board charging connection device 310 of the electric vehicle 300, it can respectively detect the voltage signal of the pile-end charging CC interface 4112 in the pile-end charging output interface 411 and the voltage signal of the pile-end cooling CC interface 4213 in the pile-end liquid inlet and outlet 421, and determine based on the detected voltage signals that both the charging device 410 and the liquid cooling device 420 are connected to the electric vehicle 300.

[0325] S720 , controlling the charging device 410 to charge the electric vehicle 300 at a first output power.

[0326] For details about the charging method not specified in detail, please refer to the relevant description of the charging method 500 mentioned above, which will not be repeated here.

[0327] In an embodiment of the present application, when the charging power required to charge the power battery 320 in the electric vehicle 300 is high, for example, when the required power is a supercharging power greater than a preset power, the charging pile 400 can, when both the charging device 410 and the liquid cooling device 420 are connected to the electric vehicle 300, perform high-power charging on the power battery 320 at the same time, and at the same time, the connected liquid cooling device 420 can transmit liquid-phase cooling medium to the electric vehicle 300 to meet the heat dissipation requirements of the power battery 320 during high-power charging, which is beneficial to the realization of high-power charging of the electric vehicle 300 by the charging device 410.

[0328] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A charging method, characterized in that: include: Determining the connection status between the electric vehicle and the charging device, and the connection status between the electric vehicle and the external liquid cooling device; According to the fact that the electric vehicle is connected to the charging device and the electric vehicle is connected to the external liquid cooling device, a supercharge request message is sent to the charging device, wherein the supercharge request message is used to instruct the charging device to charge the electric vehicle with a first output power, and the first output power is greater than or equal to a preset power.

2. The charging method according to claim 1, characterized in that: The sending a supercharge request message to the charging device includes: receiving a charging request message and a temperature request message sent by a vehicle controller of the electric vehicle, wherein the charging request message is used to instruct the charging device to charge the electric vehicle with the first output power, and the temperature request message is used to indicate temperature requirement information of the electric vehicle; Receiving an authentication message sent by the charging device; According to the authentication message indicating that the charging device has a function of outputting power greater than or equal to the preset power, the supercharging request message is sent to the charging device.

3. The charging method according to claim 2, characterized in that: The charging device having an output power greater than or equal to the preset power according to the authentication message indication, sending the supercharge request message to the charging device comprises: According to the authentication message indicating that the charging device has a function of outputting power greater than or equal to the preset power, sending the temperature request message to the external liquid cooling device; According to the temperature requirement information that the liquid cooling medium transmitted by the off-vehicle liquid cooling device meets the temperature of the electric vehicle, the supercharging request message is sent to the charging device.

4. The charging method according to any one of claims 1 to 3, characterized in that: The electric vehicle comprises a vehicle-side charging connection confirmation CC interface and a vehicle-side cooling CC interface, The determining of the connection status between the electric vehicle and the charging device, and the connection status between the electric vehicle and the external liquid cooling device, includes: Detecting the voltage signal of the vehicle-side charging CC interface, and judging the connection status between the electric vehicle and the charging device according to the voltage signal of the vehicle-side charging CC interface; Detect the voltage signal of the vehicle-end cooling CC interface, and determine the connection status between the electric vehicle and the external liquid cooling device according to the voltage signal of the vehicle-end cooling CC interface.

5. The charging method according to any one of claims 1 to 4, characterized in that: The charging method further comprises: According to the electric vehicle being connected to the charging device and the electric vehicle being connected to the external liquid cooling device, controlling the power transmission circuit between the electric vehicle and the charging device to be turned on; According to the temperature of the power transmission circuit being greater than a preset temperature, a power limit request message is sent to the charging device, wherein the power limit request message is used to instruct the charging device to reduce output power.

6. A charging method, characterized in that: include; According to the connection between the charging device in the charging pile and the electric vehicle, and the connection between the liquid cooling device in the charging pile and the electric vehicle, receiving a supercharge request message sent by the electric vehicle, wherein the supercharge message request is used to instruct the charging device to charge the electric vehicle with a first output power, and the first output power is greater than or equal to a preset power; The charging device is controlled to charge the electric vehicle with the first output power.

7. The charging method according to claim 6, characterized in that: The receiving the supercharging request message sent by the electric vehicle includes: In the case of sending an authentication message to the electric vehicle, the authentication message is used to indicate that the charging device has a function of outputting power greater than or equal to the preset power; receiving a temperature request message sent by the electric vehicle, wherein the temperature request message is used to indicate temperature requirement information of the electric vehicle; According to the temperature requirement information of the electric vehicle, the liquid cooling device is controlled to transmit the liquid cooling medium to the electric vehicle.

8. The charging method according to claim 6 or 7, characterized in that: The charging device includes a pile end charging connection confirmation CC interface, the liquid cooling device includes a pile end cooling CC interface, and the charging method further includes: Detecting a voltage signal of the charging CC interface at the charging pile end, and judging a connection state between the charging device and the electric vehicle according to the voltage signal of the charging CC interface at the charging pile end; The voltage signal of the pile end cooling CC interface is detected, and the connection state of the liquid cooling device and the electric vehicle is determined according to the voltage signal of the pile end cooling CC interface.

9. The charging method according to any one of claims 6 to 8, characterized in that: The charging method further comprises: receiving a power limit request message sent by the electric vehicle, wherein the power limit request message is used to instruct the charging device to reduce output power; The charging device is controlled to reduce output power.

10. A charging method, characterized in that: include; The on-board charging connection device and the charging pile respectively determine the connection status between the electric vehicle and the charging device in the charging pile, and the connection status between the electric vehicle and the liquid cooling device in the charging pile; According to the electric vehicle being connected to the charging device and the electric vehicle being connected to the liquid cooling device, the on-board charging connection device sends a supercharge request message to the charging pile, wherein the supercharge request message is used to instruct the charging device to charge the electric vehicle with a first output power, and the first output power is greater than or equal to a preset power; The charging pile controls the charging device to charge the electric vehicle with the first output power.

11. The charging method according to claim 10, characterized in that: The vehicle-mounted charging connection device sends a supercharging request message to the charging pile, including: The on-board charging connection device receives a charging request message and a temperature request message sent by the vehicle controller of the electric vehicle, wherein the charging request message is used to instruct the charging device to charge the electric vehicle with the first output power, and the temperature request message is used to indicate the temperature requirement information of the electric vehicle; The on-vehicle charging connection device receives the authentication message sent by the charging pile; The on-board charging connection device sends the supercharging request message to the charging pile according to the charging device indicated by the authentication message having the function of outputting power greater than or equal to the preset power.

12. The charging method according to claim 11, characterized in that: The on-board charging connection device sends the supercharging request message to the charging pile according to the charging device indicated by the authentication message having a function of outputting power greater than or equal to the preset power, including: The on-board charging connection device sends the temperature request message to the charging pile according to the charging device indicated by the authentication message having a function of outputting power greater than or equal to the preset power; The charging pile controls the liquid cooling device to transmit liquid cooling medium to the electric vehicle according to the temperature demand information of the electric vehicle; The on-board charging connection device sends the supercharging request message to the charging device according to the temperature requirement information that the liquid cooling medium transmitted by the liquid cooling device meets the temperature of the electric vehicle.

13. The charging method according to any one of claims 10 to 12, characterized in that: The vehicle-mounted charging connection device includes a vehicle-end charging connection confirmation CC interface and a vehicle-end cooling CC interface, the charging equipment includes a pile-end charging CC interface, and the liquid cooling equipment includes a pile-end cooling CC interface; The on-board charging connection device and the charging pile respectively determine the connection status between the electric vehicle and the charging device in the charging pile, and the connection status between the electric vehicle and the off-board liquid cooling device in the charging pile, including: The charging pile detects a voltage signal of the charging CC interface at the pile end, and determines a connection state between the charging device and the electric vehicle according to the voltage signal of the charging CC interface at the pile end; The charging pile detects a voltage signal of the pile end cooling CC interface, and determines a connection state between the liquid cooling device and the electric vehicle according to the voltage signal of the pile end cooling CC interface; The vehicle-mounted charging connection device detects the voltage signal of the vehicle-end charging CC interface, and determines the connection status between the electric vehicle and the charging device according to the voltage signal of the vehicle-end charging CC interface; The vehicle-mounted charging connection device detects the voltage signal of the vehicle-end cooling CC interface, and determines the connection status between the charging vehicle and the liquid cooling device according to the voltage signal of the vehicle-end cooling CC interface.

14. The charging method according to any one of claims 10 to 13, characterized in that: The charging method further comprises: When the temperature of the power transmission circuit between the electric vehicle and the charging device is greater than a preset temperature, the on-board charging connection device sends a power limit request message to the charging pile, wherein the power limit request message is used to instruct the charging device to reduce the output power; The charging pile controls the charging device to reduce output power.

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