A charging system and on-board charging connection device

Abstract

This application provides a charging system and an on-board charging connection device. The charging system includes a charging device and an on-board charging connection device for electric vehicles. The charging device includes a charging unit and a liquid cooling unit. The charging unit can output direct current to the electric vehicle through the on-board charging connection device. The liquid cooling medium in the liquid cooling unit can be transferred to the thermal management system of the electric vehicle's power battery through the on-board charging connection device. This allows for high-power charging of the electric vehicle's power battery while simultaneously transferring liquid cooling medium to the power battery's thermal management system, effectively meeting the heat dissipation requirements of the power battery during high-power charging, enabling the electric vehicle to perform high-power charging and reducing charging time.

Description

[0001] This application is a divisional application. The original application has the application number 202311287649.1 and the original application date is September 30, 2023. The entire contents of the original application are incorporated herein by reference. Technical Field

[0002] This application relates to the field of charging technology, and more specifically, to a charging system and an on-board charging connection device. Background Technology

[0003] With breakthroughs in high-power battery charging technology, it is now possible to fully charge batteries in a short time. However, in current practical applications, when a charging device performs high-power charging on the power battery of an electric vehicle, the heat generated by the battery increases significantly. If this heat cannot be dissipated in time, it will affect the normal operation of the charging device in performing high-power charging on the power battery.

[0004] Electric vehicles typically come equipped with a thermal management system to provide the necessary cooling for the power battery. However, as charging power increases, the heat generated by the power battery grows significantly, and the effectiveness of relying solely on the thermal management system for heat dissipation is quite limited. The thermal management system's cooling capacity is no longer sufficient to meet the heat dissipation requirements of the power battery during high-power charging. Summary of the Invention

[0005] This application provides a charging system and an on-board charging connection device. While charging the power battery of an electric vehicle at high power, the charging system can also transmit liquid cooling medium to the thermal management system of the power battery. This helps to meet the heat dissipation requirements of the power battery during high-power charging, enabling the electric vehicle to be charged at high power and reducing the charging time of the electric vehicle.

[0006] In a first aspect, a charging system is provided, comprising a charging pile and an on-board charging connection device. The on-board charging connection device is applied to an electric vehicle, which includes a thermal management system for a power battery. The charging pile includes charging equipment and liquid cooling equipment. The charging equipment includes multiple power conversion devices and a charging output interface at the pile end. The liquid cooling equipment includes a liquid inlet / outlet at the pile end. The on-board charging connection device includes a charging input interface at the vehicle end and a liquid inlet / outlet at the vehicle end. The multiple power conversion devices are electrically connected to the charging output interface at the pile end, which is used to electrically connect to the charging input interface at the vehicle end, so that the multiple power conversion devices output DC power to the charging input interface at the vehicle end. The liquid inlet / outlet at the pile end is used to connect to the liquid inlet / outlet at the vehicle end, so that the liquid cooling medium in the liquid cooling equipment is transferred to the thermal management system of the power battery through the liquid inlet / outlet at the vehicle end.

[0007] In this embodiment, the on-board charging connection device is equipped with a vehicle-side charging input interface and a vehicle-side liquid inlet / outlet. When the on-board charging connection device is applied to an electric vehicle, the electric vehicle's power battery can be electrically connected to the charging equipment in the charging pile through the vehicle-side charging input interface of the on-board charging connection device. This allows the charging equipment to output DC power to the power battery through the on-board charging connection device for charging. Simultaneously, the thermal management system of the power battery in the electric vehicle can be connected to the liquid cooling equipment in the charging pile through the vehicle-side liquid inlet / outlet of the on-board charging connection device. This allows the liquid cooling equipment to transfer liquid cooling medium to the thermal management system of the power battery through the on-board charging connection device for cooling the charging power battery. This helps meet the heat dissipation requirements of the power battery during high-power charging, facilitates high-power charging of the electric vehicle by the charging equipment, and reduces the charging time of the electric vehicle.

[0008] In addition, using liquid cooling equipment in charging piles to cool the power battery eliminates the need for an additional cooling system for the power battery in electric vehicles, avoiding an increase in vehicle weight and helping to reduce the manufacturing cost of electric vehicles and the difficulty of developing the whole vehicle system.

[0009] In conjunction with the first aspect, in some implementations of the first aspect, the charging output interface at the pile end includes a DC interface at the pile end and a charging connection confirmation CC interface at the pile end; the liquid inlet / outlet at the pile end includes a liquid inlet interface at the pile end, a liquid outlet interface at the pile end, and a cooling CC interface at the pile end; the charging input interface at the vehicle end includes a DC interface at the vehicle end and a charging CC interface at the vehicle end; the liquid inlet / outlet at the vehicle end includes a liquid inlet interface at the vehicle end, a liquid outlet interface at the vehicle end, and a cooling CC interface at the vehicle end; wherein, the DC interface at the pile end is used for electrical connection with the DC interface at the vehicle end, so that multiple power conversion devices output DC power to the DC interface at the vehicle end; the liquid outlet interface at the pile end is used for connection with the liquid inlet interface at the vehicle end, so as to cool the liquid phase in the liquid cooling equipment. The medium is transferred to the thermal management system of the power battery; the pile-end liquid inlet interface is used to connect with the vehicle-end liquid outlet interface to transfer the liquid phase cooling medium in the thermal management system of the power battery to the liquid cooling equipment; the pile-end charging CC interface is used to electrically connect with the vehicle-end charging CC interface, and the voltage signals of the pile-end charging CC interface and the vehicle-end charging CC interface are used to indicate the connection status of the pile-end charging output interface and the vehicle-end charging output interface; the pile-end cooling CC interface is used to electrically connect with the vehicle-end cooling CC interface, and the voltage signals of the pile-end cooling CC interface and the vehicle-end cooling CC interface are used to indicate the connection status of the pile-end liquid inlet / outlet and the vehicle-end liquid inlet / outlet, respectively.

[0010] It is understood that, in the embodiments of this application, the voltage signals of each CC interface in the charging pile and the vehicle charging connection device can refer to the voltage value of each CC interface. Different voltage values ​​can indicate the connection status of the corresponding interfaces of the charging pile and the vehicle charging connection device.

[0011] In this embodiment, by setting a charging CC interface in the charging output interface of the charging pile and a charging CC interface in the charging input interface of the vehicle, the charging pile and the on-board charging connection device can determine the connection status of the charging output interface and the charging input interface of the vehicle through the voltage signal of their respective charging CC interfaces. Furthermore, by setting a cooling CC interface in the liquid inlet / outlet of the charging pile and a cooling CC interface in the liquid inlet / outlet of the vehicle, the charging pile and the on-board charging connection device can determine the connection status of the liquid inlet / outlet of the charging pile and the liquid inlet / outlet of the vehicle through the voltage signal of their respective cooling CC interfaces. In this way, the charging equipment in the charging pile can charge the power battery at high power when the charging output interface and the charging input interface of the vehicle are connected, and the liquid inlet / outlet of the charging pile and the liquid inlet / outlet of the vehicle are connected. Simultaneously, the liquid cooling equipment can cool the power battery by transmitting liquid cooling medium to the power battery's thermal management system, thereby meeting the heat dissipation requirements of the power battery during high-power charging and facilitating high-power charging of electric vehicles by the charging equipment.

[0012] In conjunction with the first aspect, in some implementations of the first aspect, the charging pile further includes a pile-end cooling CC circuit, which includes a first pile-end cooling CC circuit, which includes a first resistor unit, and a pile-end cooling CC interface, which is grounded through the first pile-end resistor unit; the vehicle-mounted charging connection device includes a vehicle-end cooling CC circuit, which includes a first vehicle-end cooling CC circuit, which includes a first vehicle-end cooling CC circuit, which includes a first vehicle-end resistor unit and a vehicle-end voltage source, and a vehicle-end cooling CC interface, which is electrically connected to the vehicle-end voltage source through the first vehicle-end resistor unit; the first pile-end cooling CC interface is used to electrically connect to the first vehicle-end cooling CC interface, and the voltage signal of the first pile-end cooling CC interface and the voltage signal of the first vehicle-end cooling CC interface are used to indicate the connection status of the pile-end inlet / outlet and the vehicle-end inlet / outlet, respectively.

[0013] In this embodiment, since the first vehicle-end cooling CC interface is electrically connected to the vehicle-end voltage source in the on-board charging connection device, when the voltage value of the first vehicle-end cooling CC interface is the same as the voltage value of the vehicle-end voltage source, it indicates that the charging pile inlet / outlet and the vehicle-end inlet / outlet are not connected. When the voltage value of the first vehicle-end cooling CC interface reaches the first vehicle-end preset value, the on-board charging connection device can identify that the charging pile inlet / outlet and the vehicle-end inlet / outlet are connected. Identifying the connection status of the charging pile inlet / outlet and the vehicle-end inlet / outlet through the voltage value of the first vehicle-end cooling CC interface improves the accuracy of the on-board charging connection device in identifying the connection status, thereby meeting the heat dissipation requirements of the power battery during high-power charging and facilitating the high-power charging of electric vehicles by the charging equipment.

[0014] In conjunction with the first aspect, in some implementations of the first aspect, the pile-end cooling CC circuit further includes a second pile-end cooling CC circuit, which includes a second pile-end resistor unit and a pile-end voltage source. The pile-end cooling CC interface also includes a second pile-end cooling CC interface, which is electrically connected to the pile-end voltage source through the second pile-end resistor unit. The vehicle-end CC circuit further includes a second vehicle-end cooling CC circuit, which also includes a second vehicle-end resistor unit. The vehicle-end cooling CC interface also includes a second vehicle-end cooling CC interface, which is grounded through the second vehicle-end resistor unit. The second pile-end cooling CC interface is used to electrically connect to the second vehicle-end cooling CC interface. The voltage signal of the second pile-end cooling CC interface and the voltage signal of the second vehicle-end cooling CC interface are used to indicate the connection status of the pile-end inlet / outlet and the vehicle-end inlet / outlet, respectively.

[0015] In this embodiment, since the second terminal cooling CC circuit is electrically connected to the terminal voltage source in the charging pile, when the voltage value of the second terminal cooling CC interface is the output voltage value of the terminal voltage source, it indicates that the terminal liquid inlet / outlet and the vehicle liquid inlet / outlet are not connected. When the voltage value of the second terminal cooling CC interface reaches the first terminal voltage value, the charging pile can identify that the terminal liquid inlet / outlet and the vehicle liquid inlet / outlet are connected. Identifying the connection status of the terminal liquid inlet / outlet and the vehicle liquid inlet / outlet through the voltage value of the second terminal cooling CC interface can improve the accuracy of the charging pile in identifying the connection status of the terminal liquid inlet / outlet and the vehicle liquid inlet / outlet. When the charging equipment charges the power battery at high power, the liquid cooling equipment cools the power battery by transmitting liquid phase cooling medium to the power battery's thermal management system, thereby helping to meet the heat dissipation requirements of the power battery during high-power charging and facilitating the high-power charging of electric vehicles by the charging equipment.

[0016] Furthermore, since the second vehicle-side cooling CC circuit is grounded, a voltage of 0 at the second vehicle-side cooling CC interface indicates that the charging pile inlet / outlet and the vehicle-side inlet / outlet are not connected. When the voltage at the second vehicle-side cooling CC interface reaches the preset value, the on-board charging connection device can identify that the charging pile inlet / outlet and the vehicle-side inlet / outlet are connected. In this way, the on-board charging connection device can combine the voltage values ​​of the first and second vehicle-side cooling CC interfaces to identify the connection status of the charging pile inlet / outlet and the vehicle-side inlet / outlet, further improving the accuracy of the on-board charging connection device in identifying the connection status of the charging pile inlet / outlet and the vehicle-side inlet / outlet. This can meet the heat dissipation requirements of the power battery during high-power charging and facilitate the high-power charging of electric vehicles by the charging equipment. This further improves the accuracy of the on-board charging connection device in identifying the connection status of the charging pile inlet / outlet and the vehicle-side inlet / outlet.

[0017] In conjunction with the first aspect, in some implementations of the first aspect, the second pile end cooling CC circuit further includes a normally closed switch, and the second pile end cooling CC interface is electrically connected to the second pile end resistor unit through the normally closed switch; a detection point is provided between the normally closed switch and the second pile end resistor unit, and the voltage signal of the detection point is used to indicate the connection status of the pile end liquid inlet / outlet and the vehicle end liquid inlet / outlet.

[0018] In this embodiment, the liquid cooling device can identify the connection status of the pile end liquid inlet / outlet and the vehicle end liquid inlet / outlet based on the voltage value of the second pile end cooling CC interface and further combine 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 / outlet and the vehicle end liquid inlet / outlet.

[0019] In conjunction with the first aspect, in some implementations of the first aspect, the on-board charging connection device further includes a temperature sensor for the vehicle-side DC interface, which is used to detect at least one of the following temperatures: the temperature of the vehicle-side DC interface and the temperature of the power transmission cable electrically connected to the vehicle-side DC interface; the on-board charging connection device further includes an on-board charging connection controller, and the charging system further includes a charging pile controller; the on-board charging connection controller is used to send a power limiting request message to the charging pile controller when the temperature detected by the temperature sensor of the vehicle-side DC interface is greater than a preset temperature, the power limiting request message being used to instruct the charging equipment to reduce its output power; the charging pile controller controls the charging equipment to reduce its output power according to the power limiting request message.

[0020] In this embodiment, by setting a temperature sensor for the vehicle-side DC interface, the on-board charging connection device can monitor and alarm the temperature of the vehicle-side DC interface that transmits DC power and the temperature of the power transmission cable that transmits DC power in real time. When the monitored temperature is abnormal, the on-board charging connection device can request the charging equipment to reduce the charging power, which helps to ensure that the charging equipment charges the power battery normally through the on-board charging connection device.

[0021] In conjunction with the first aspect, in some implementations of the first aspect, the on-board charging connection controller is further configured to: send an overcharge request message to the charging pile controller when the charging pile output interface and the vehicle charging input interface, as well as the charging pile inlet / outlet and the vehicle inlet / outlet, are connected; the overcharge request message is used to instruct the charging equipment to output DC power to the vehicle charging input interface at a first output power, wherein the first output power is greater than or equal to a preset power; the charging pile controller is further configured to: control the charging equipment to output DC power to the vehicle charging input interface at the first output power.

[0022] It is understood that, in the embodiments of this application, when the charging device outputs DC power to the power battery of the electric vehicle through the on-board charging connection device at a first output power greater than or equal to the preset power, it can be referred to as the charging device overcharging the electric vehicle; when the charging device outputs DC power to the power battery of the electric vehicle through the on-board charging connection device at an output power less than the preset power, it can be referred to as the charging device fast charging the electric vehicle.

[0023] In this embodiment, the on-board charging connection device can request the charging equipment to charge the electric vehicle's power battery at a higher power through a supercharge request message when the charging output interface at the charging pile end and the charging input interface at the vehicle end, as well as the liquid inlet / outlet at the charging pile end and the liquid inlet / outlet at the vehicle end, are all connected. This allows the charging equipment to charge the power battery at a high power through the on-board charging connection device, while the liquid cooling device can cool the power battery by transmitting liquid phase cooling medium to the power battery's thermal management system. This helps to meet the heat dissipation requirements of the power battery during high-power charging and facilitates the high-power charging of the electric vehicle by the charging equipment.

[0024] In conjunction with the first aspect, in certain implementations of the first aspect, the on-board charging connection controller is used to send an overcharge request message to the charging pile controller, including: the on-board charging connection controller is used to: receive an authentication message sent by the charging pile controller, and send an overcharge request message to the charging pile controller when the authentication message indicates that the charging device has the function of output power greater than or equal to a preset power.

[0025] In this embodiment, the on-board charging connection device can first determine, based on the authentication message sent by the charging pile, that the charging equipment in the charging pile has the ability to output DC power to the power battery of the electric vehicle with an output power greater than or equal to a preset power, i.e., when the charging equipment has a supercharging function, request the charging equipment to charge the power battery of the electric vehicle with a higher power through a supercharging request message. This helps to ensure that the charging equipment can charge the power battery with high power through the on-board charging connection device.

[0026] In conjunction with the first aspect, in some implementations of the first aspect, the on-board charging connection controller is used to send an overcharge request message to the charging pile controller when the authentication message indicates that the charging device has the function of output power greater than or equal to a preset power. This includes: sending a temperature request message to the charging pile controller when the authentication message indicates that the charging device has the function of output power greater than or equal to a preset power, the temperature request message being used to indicate the temperature requirement information of the electric vehicle; and sending an overcharge request message to the charging pile controller when the temperature of the liquid phase cooling medium transmitted from the liquid cooling device to the inlet and outlet of the vehicle meets the temperature requirement information of the electric vehicle.

[0027] In this embodiment, the on-board charging connection device can, when the charging output interface at the charging pile and the charging input interface at the vehicle end, as well as the liquid inlet / outlet at the charging pile and the liquid inlet / outlet at the vehicle end, all are connected, first send a temperature request message to the charging pile. This allows the liquid cooling equipment in the charging pile to first transmit liquid-phase cooling medium to the thermal management system of the power battery through the on-board charging connection device. After the transmitted liquid-phase cooling medium meets the temperature requirements of the electric vehicle, a supercharge request message is then sent to the charging pile, enabling the charging equipment to perform high-power charging of the power battery. This helps to further ensure that the liquid-phase cooling medium transmitted by the liquid cooling equipment meets the heat dissipation requirements of the power battery during high-power charging, facilitating the realization of high-power charging of the electric vehicle by the charging equipment.

[0028] In conjunction with the first aspect, in some implementations of the first aspect, the on-board charging connection controller is also used to: send a fast charging request message to the pile terminal controller when the charging output interface at the pile terminal and the charging input interface at the vehicle terminal are connected, but the liquid inlet / outlet at the pile terminal and the liquid inlet / outlet at the vehicle terminal are not connected. The fast charging request message is used to instruct the charging equipment to output DC power to the charging input interface at an output power lower than a preset power.

[0029] In this embodiment, the on-board charging connection device can request the charging equipment to charge the electric vehicle's power battery at a relatively low power through a fast charging request message, even when the charging output interface at the charging pile and the charging input interface at the vehicle are connected, and the liquid inlet / outlet at the charging pile and the liquid inlet / outlet at the vehicle are not connected. This can avoid the problem of the power battery overheating due to the charging power of the charging equipment being too high, and helps to ensure that the charging equipment charges the power battery normally through the on-board charging connection device.

[0030] Secondly, an on-board charging connection device is provided, which is applied to an electric vehicle. The electric vehicle includes a power battery and a thermal management system for the power battery. The on-board charging connection device includes at least one vehicle-side charging input interface, a vehicle-side charging output interface, a first liquid inlet / outlet, and a second liquid inlet / outlet. Each of the at least one vehicle-side charging input interface is electrically connected to the vehicle-side charging output interface, and each vehicle-side charging input interface is used to be electrically connected to a charging device. The vehicle-side charging output interface is used to be electrically connected to the power battery, so that the charging device outputs direct current to the power battery. The first liquid inlet / outlet and the second liquid inlet / outlet are connected. The first liquid inlet / outlet is used to be connected to an external liquid cooling device, and the second liquid inlet / outlet is used to be connected to the thermal management system of the power battery, so as to transfer the liquid phase cooling medium in the external liquid cooling device to the thermal management system of the power battery.

[0031] It is understood that, in the embodiments of this application, the first liquid inlet / outlet can also be referred to as the vehicle end liquid inlet / outlet.

[0032] In this embodiment, the on-board charging connection device is provided with an electrically connected vehicle-side charging input interface and a vehicle-side charging output interface, as well as a connected first and second liquid inlet / outlet. When the on-board charging connection device is applied to an electric vehicle, the electric vehicle's power battery is electrically connected to the vehicle-side charging output interface and to the charging equipment via the vehicle-side charging input interface, enabling the charging equipment to charge the power battery through the on-board charging connection device. Simultaneously, the thermal management system of the power battery in the electric vehicle is connected to the second liquid inlet / outlet and to an external liquid cooling device via the first liquid inlet / outlet, allowing the external liquid cooling device to transfer liquid cooling medium to the power battery's thermal management system through the on-board charging connection device to cool the charging power battery. This helps meet the heat dissipation requirements of the power battery during high-power charging, facilitates high-power charging of the electric vehicle by the charging equipment, and reduces the charging time of the electric vehicle.

[0033] In conjunction with the second aspect, in some implementations of the second aspect, each vehicle-side charging input interface includes a vehicle-side DC interface and a vehicle-side charging connection confirmation (CC) interface; the first liquid inlet / outlet includes a first liquid inlet interface, a first liquid outlet interface, and a vehicle-side cooling CC interface; the second liquid inlet / outlet includes a second liquid inlet interface and a second liquid outlet interface; wherein, the vehicle-side DC interface is used to transmit the DC power output from the charging device to the vehicle-side charging output interface; the voltage signal of the vehicle-side charging CC port is used to indicate the connection status between the vehicle-side charging input interface and the charging device; the first liquid inlet interface is connected to the second liquid outlet interface to transfer the liquid phase cooling medium in the external liquid cooling device to the thermal management system of the power battery; the first liquid outlet interface is connected to the second liquid inlet interface to transfer the liquid phase cooling medium in the thermal management system to the external liquid cooling device; the voltage signal of the vehicle-side cooling CC interface is used to indicate the connection status between the first liquid inlet / outlet interface and the external liquid cooling device.

[0034] In this embodiment, a vehicle-side charging CC interface is set through the vehicle-side charging input interface, and a vehicle-side cooling CC interface is set in the vehicle-side liquid inlet / outlet. This allows the on-board charging connection device to determine the connection status between the vehicle-side charging input interface and the charging equipment, and between the vehicle-side liquid inlet / outlet and the external liquid cooling equipment, through the voltage signals of the corresponding CC interfaces. In this way, when the vehicle-side charging input interface is connected to the charging equipment and the vehicle-side liquid inlet / outlet is connected to the external liquid cooling equipment, the on-board charging connection device can deliver DC power with a higher output to the power battery from the charging equipment, while simultaneously transferring the liquid cooling medium from the liquid cooling equipment to the power battery's thermal management system to cool the power battery. This helps meet the heat dissipation requirements of the power battery during high-power charging and facilitates high-power charging of electric vehicles by the charging equipment.

[0035] In conjunction with the second aspect, in some implementations of the second aspect, the on-board charging connection device further includes a liquid inlet pipe, a heat exchange structure, and a liquid outlet pipe. The liquid inlet pipe is used to transfer the liquid phase cooling medium received by the first liquid inlet interface from the external liquid cooling device to the second liquid outlet interface. The heat exchange structure is connected to the cooling liquid inlet pipe and is used to perform heat exchange with the vehicle-end DC interface and the power transmission cable electrically connected to the vehicle-end DC interface. The liquid outlet pipe is used to transfer the liquid phase cooling medium received by the second liquid inlet interface from the thermal management system of the power battery to the first liquid outlet interface.

[0036] In this embodiment, the on-board charging connection device transmits the liquid cooling medium from the external liquid cooling equipment to the thermal management system of the power battery through the liquid inlet pipe. By connecting a heat exchange structure to the liquid inlet pipe, the heat exchange structure can use the transmitted liquid cooling medium to perform heat exchange on the vehicle-side DC interface for transmitting DC power and the power transmission cable for transmitting DC power in the on-board charging connection device, thereby cooling the vehicle-side DC interface and the power transmission cable for transmitting DC power. This helps to further meet the heat dissipation requirements of the power battery during high-power charging and facilitates the realization of high-power charging of electric vehicles by the charging equipment.

[0037] In conjunction with the second aspect, in some implementations of the second aspect, the on-board charging connection device further includes a heated liquid inlet pipe; the heated liquid inlet pipe is used to transfer the liquid phase heating medium received by the first liquid inlet interface from the external liquid cooling device to the second liquid outlet interface.

[0038] In this embodiment of the application, according to actual application requirements, the external liquid cooling device can also transmit liquid heating medium to the thermal management system of the power battery through the on-board charging connection device, so as to heat the power battery through the thermal management system of the power battery.

[0039] In conjunction with the second aspect, in some implementations of the second aspect, the on-board charging connection device further includes a charging circuit contactor; the charging circuit contactor is electrically connected between the vehicle-end DC interface and the vehicle-end charging output interface of each vehicle-end charging input interface; the charging circuit contactor is used to disconnect or connect the power transmission circuit between the vehicle-end DC interface electrically connected to the charging circuit contactor and the power battery.

[0040] In this embodiment, the power transmission circuit between the charging device and the power battery is disconnected or connected by a charging circuit contactor installed in the on-board charging connection device. The charging circuit contactor can be controlled by the on-board charging connection device, which helps to reduce the modification of the electric vehicle's own charging control function caused by the multiple vehicle-end charging input interfaces installed on the on-board charging connection device. This results in less modification to the entire electric vehicle and helps to reduce the development difficulty and cycle of the electric vehicle.

[0041] In conjunction with the second aspect, in some implementations of the second aspect, the on-board charging connection device further includes a fuse; the fuse and the charging circuit contactor are connected in series between the vehicle-end DC interface and the DC bus of each vehicle-end charging input interface; the fuse is used to disconnect the power transmission circuit between the vehicle-end DC interface electrically connected to the fuse and the power battery when the current transmitted to the fuse is greater than a preset current.

[0042] In this embodiment of the application, by connecting the fuse and the charging circuit contactor in series, short-circuit protection can be provided for the power transmission circuit between the charging equipment and the power battery, so as to further ensure the normal charging of the power battery by the charging equipment through the on-board charging connection device.

[0043] In conjunction with the second aspect, in some implementations of the second aspect, the on-board charging connection device further includes a temperature sensor for the vehicle-side DC interface and a temperature sensor for the first inlet / outlet; the temperature sensor for the vehicle-side DC interface is used to detect at least one of the following temperatures: the temperature of the vehicle-side DC interface and the temperature of the power transmission cable electrically connected to the vehicle-side DC interface; the temperature sensor for the first inlet / outlet is used to detect the temperature of the first inlet / outlet.

[0044] In this embodiment of the application, by setting a temperature sensor for the vehicle-side DC interface and a temperature sensor for the first liquid inlet / outlet, the on-board charging connection device can monitor and alarm in real time the temperature of the vehicle-side DC interface that transmits DC power in the vehicle-side charging input interface, the temperature of the power transmission cable that transmits DC power, and the temperature of the liquid phase cooling medium transmitted from the external liquid cooling equipment to the on-board charging connection device.

[0045] In conjunction with the second aspect, in some implementations of the second aspect, the on-board charging connection device further includes an on-board charging connection controller, which is further configured to: send a power limiting request message to the charging device when the temperature detected by the temperature sensor of the DC interface at the vehicle end is greater than a preset temperature, the power limiting request message being used to instruct the charging device to reduce the output power.

[0046] In this embodiment, the on-board charging connection device can request the charging equipment to reduce the charging power when the temperature monitored by the temperature sensor of the vehicle's DC interface is abnormal, which helps to ensure that the charging equipment charges the power battery normally through the on-board charging connection device. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of a charging system provided in an embodiment of this application.

[0048] Figure 2 This is a schematic diagram of a charging system provided in an embodiment of this application.

[0049] Figure 3 This is a schematic diagram of a charging system provided in an embodiment of this application.

[0050] Figure 4 This is a schematic diagram of the structure of an electric vehicle including an on-board charging connection device, provided in an embodiment of this application.

[0051] Figure 5This is a schematic diagram of the structure of an electric vehicle including an on-board charging connection device, provided in an embodiment of this application.

[0052] Figure 6 This is a schematic diagram of the structure of an electric vehicle provided in this application embodiment, showing a separate pipeline for transmitting liquid phase heating medium between the first and second liquid inlets / outlets.

[0053] Figure 7 This is a schematic diagram of the connection structure of an on-board charging connection device, a power battery, and a thermal management system provided in an embodiment of this application.

[0054] Figure 8 This is a schematic diagram of the structure of a power battery provided in an embodiment of this application.

[0055] Figure 9 This is a schematic diagram of the connection structure of an on-board charging connection device, a power battery, and a thermal management system provided in an embodiment of this application.

[0056] Figure 10 This is a schematic diagram of the connection structure of an on-board charging connection device, a power battery, and a thermal management system provided in an embodiment of this application.

[0057] Figure 11 This is a schematic diagram of the connection structure of an on-board charging connection device, a power battery, and a thermal management system provided in an embodiment of this application.

[0058] Figure 12 This is a schematic diagram of the structure of a charging pile provided in an embodiment of this application.

[0059] Figure 13 This is a schematic diagram of the structure of a device body provided in an embodiment of this application.

[0060] Figure 14 This is a schematic diagram of the structure of a device body provided in an embodiment of this application.

[0061] Figure 15 This 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 this application.

[0062] Figure 16 This 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 this application.

[0063] Figure 17 This is a schematic flowchart of a charging method provided in an embodiment of this application.

[0064] Figure 18 This is a schematic flowchart of a charging method provided in an embodiment of this application.

[0065] Figure 19 This is a schematic flowchart of a charging method provided in an embodiment of this application.

[0066] Figure 20 This is a schematic flowchart of a charging method provided in an embodiment of this application. Detailed Implementation

[0067] Before introducing the embodiments of this application, the following points should be made first.

[0068] 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.

[0069] In the description of the embodiments of this application, unless otherwise stated, "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0070] The prefixes such as "first" and "second" used in this application embodiment are merely for distinguishing different descriptive objects and do not limit the position, order, priority, quantity, or content of the described objects. The use of ordinal numbers and other prefixes used to distinguish descriptive objects in this application embodiment does not constitute a limitation on the described objects. The description of the described objects is given in the claims or the context of the embodiments, and should not constitute unnecessary restrictions due to the use of such prefixes. Furthermore, in the description of this embodiment, unless otherwise stated, "multiple" means two or more.

[0071] The technical terms that may appear in the embodiments of this application are explained below.

[0072] Connection confirm (CC) signal: This is a functional signal that indicates, electronically or mechanically, the status of the vehicle plug being electrically connected to the electric vehicle and / or the power supply plug being electrically connected to the charging equipment. The interface used to transmit the CC signal is called the CC interface. For DC-charged electric vehicles, the interface for transmitting the CC signal is further divided into two: the CC1 interface and the CC2 interface. The CC1 interface is the connection confirm signal on the charging pile side, and the CC2 interface is the connection confirm signal on the vehicle side.

[0073] Battery Management System (BMS): This is a control system in electric vehicles that protects the safety of the power battery. It monitors the battery's operating status, mitigates inconsistencies through necessary measures, and provides safety assurance for the battery's use.

[0074] Thermal management system (TMS): It is an important component of electric vehicles and mainly consists of 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 conditioning, etc., to perform thermal management on these managed objects and keep their temperature within the normal operating range.

[0075] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0076] First, to facilitate understanding of the technical solutions provided in the embodiments of this application, the application scenarios applicable to the embodiments of this application will be introduced below.

[0077] Figure 1 This is a schematic diagram of the structure of a charging system 10 provided in an embodiment of this application.

[0078] Combination Figure 1 As shown in (a) and (b), the charging system 10 may include a charging device 11 and an electric vehicle 12.

[0079] In some embodiments, such as Figure 1 As shown in (a), the charging device 11 can 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 the charging gun 113 via a cable. The charging gun 113 is used to electrically connect to the electric vehicle 12.

[0080] The charging host 111 includes multiple power conversion devices that can convert AC power from the external power grid 20 into stable DC power before supplying it to the charging terminal 112, and then supplying it to the electric vehicle 12 via the charging gun 113 electrically connected to the charging terminal 112. These power conversion devices may include, for example, alternating current-to-direct current (AC-DC) converters and direct current-to-direct current (DC-DC) converters.

[0081] In practice, the user can insert the charging gun 113 into the charging port of the electric vehicle 12, so that the charging gun 113 can be electrically connected 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.

[0082] The charging terminal 112 may include a housing, a human-machine interface, a charging control unit, and a metering and billing unit, and is used to interact with the electric vehicle 12 for information exchange, energy transmission, and metering and billing.

[0083] Electric vehicle 12 can be a means of transportation that is driven by electric power. Electric vehicle 12 can be, for example, a pure electric vehicle (battery 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), etc.

[0084] In other embodiments, such as Figure 1 As shown in (b), the charging device 11 can be an integrated charging device. Specifically, the charging device 11 may only include a charging host 111 and at least one charging gun 113 electrically connected to the charging host 111, excluding the charging terminal 112. The human-machine interface, charging control unit, and metering and billing unit can be directly installed in the charging host 111. Multiple power conversion devices in the charging host 111 convert the AC power from the external power grid 20 into stable DC power, which is then directly delivered to the electric vehicle 12 through the charging gun 113.

[0085] In the aforementioned charging system 10, with the development of high-rate charging technology for power batteries and the increasing demands from users for faster charging times of electric vehicles 12, high-power charging of electric vehicles 12 by charging equipment 11 has become a future trend. For example, charging equipment 11 may perform short-term fast charging or supercharging of the power battery of electric vehicles 12. However, in current practical applications, when charging equipment 11 performs high-power charging of the power battery, the heat generated by the power battery increases significantly. If this heat cannot be dissipated in time, it will prevent the charging equipment 11 from performing high-power charging of the power battery normally.

[0086] Although electric vehicles generally come with a thermal management system to provide the necessary cooling for the power battery, with the increase in charging power, such as in supercharging scenarios, the heat generated by the power battery is increasing. The cooling effect of the thermal management system alone is limited, and its cooling capacity can no longer meet the heat dissipation requirements of the power battery during high-power charging.

[0087] Currently, some electric vehicles 12 have added additional cooling systems to cool the power battery during high-power charging, thereby improving the cooling capacity of the power battery during high-power charging. However, these additional cooling systems not only occupy space in the electric vehicle 12, but also increase the overall vehicle weight and manufacturing cost, and make the development of the entire electric vehicle system more difficult. In addition, the additional cooling system only operates when the power battery is being charged at high power; it remains idle under other operating conditions, resulting in low utilization of the cooling system.

[0088] Based on the above, this application provides an embodiment including an on-board charging connection device, an electric vehicle, a charging pile, a charging system, and a charging method. The purpose is to enable the electric vehicle to be charged at high power through the charging equipment in the charging pile, while the power battery of the electric vehicle can be cooled by the liquid cooling equipment installed in the charging pile, so as to meet the heat dissipation requirements of the power battery during high-power charging and facilitate the realization of high-power charging of electric vehicles by the charging pile.

[0089] The following description, in conjunction with the accompanying drawings, details the on-board charging connection device, electric vehicle, charging pile, and charging system provided in the embodiments of this application. It should be noted that, for ease of understanding, in the accompanying drawings provided in the embodiments of this application, solid lines represent power transmission lines, short dashed lines represent conduit connection lines, and long dashed lines represent signal transmission lines.

[0090] Figure 2 This is a schematic diagram of the structure of a charging system 200 provided in an embodiment of this application.

[0091] See Figure 2 The charging system 200 may include an on-board charging connection device 310 and a charging pile 400.

[0092] The on-board charging connection device 310 may include a vehicle-side charging input interface 311 and a vehicle-side liquid inlet / 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 / outlet 421.

[0093] The charging host 412 may include multiple power conversion devices that can convert AC power from the external power grid into stable DC power before supplying it to the charging output interface 411 at the charging pile. The charging output interface 411 at the charging pile can be electrically connected to the charging input interface 311 at the vehicle end, allowing the multiple power conversion devices to output DC power to the charging input interface 311. The liquid inlet / outlet 421 at the charging pile can be connected to the liquid inlet / outlet 312 at the vehicle end to transfer the liquid cooling medium from the liquid cooling device 420 to the liquid inlet / outlet 312 at the vehicle end.

[0094] In practical 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 (hereinafter referred to as the thermal management system 330). The thermal management system 330 can be connected to the power battery 320 through pipelines 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 deliver DC power output from multiple power conversion devices to the power battery 320 for charging. The vehicle-side liquid inlet / outlet 312 can be connected to the thermal management system 330 through pipelines to transfer the liquid cooling medium in the liquid cooling device 420 to the thermal management system 330, enabling the thermal management system 330 to utilize the liquid cooling device 420 to cool the power battery 320.

[0095] It is understandable that charging device 410 could be Figure 1 The split charging device shown in (a) is, or Figure 1 The integrated charging device is shown in (b) above. For ease of description and understanding, the embodiments of this application use charging device 410 as an example. Figure 1 The split-type charging device shown in (a) is used as an example for explanation.

[0096] Specifically, see Figure 2 The charging device 410 may further include at least one charging terminal 413 electrically connected to the charging host 412. Each charging terminal 413 may be electrically connected to the charging gun (not shown in the figure) via a cable. The charging output interface 411 at the charging station may be a charging plug disposed in the charging gun. Correspondingly, the charging input interface 311 at the vehicle end may be a charging socket disposed in the vehicle charging connection device 310 for plugging into the charging output interface 411 at the charging station in the charging gun.

[0097] For a detailed description of charging device 410, please refer to [link / reference]. Figure 1 The embodiments shown are not described in detail here.

[0098] It is also understood that the liquid cooling device 420 can be located outside the charging device 410 or integrated inside the charging device 410.

[0099] For example, in some embodiments, see Figure 2 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 piping. The device body 422 may include a cooling system for the liquid cooling device 420, in which a liquid cooling medium is transferred to the liquid cooling gun via piping. The pile-end inlet / outlet 421 may be a liquid cooling plug disposed in the liquid cooling gun. Correspondingly, the vehicle-end inlet / outlet 312 may be a liquid cooling socket disposed in the on-board charging connection device 310, for connecting to the pile-end inlet / outlet 421 in the liquid cooling gun.

[0100] In other embodiments, see Figure 3 , Figure 3 This is a schematic diagram of another charging system 200 provided in an embodiment of this application. Figure 3 In the illustrated embodiment, the main 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 integrated charging and cooling composite gun, and the charging output interface 411 and the liquid inlet / outlet 421 at the charging pile end can be composite plugs provided in the composite gun. Correspondingly, the charging input interface 311 and the liquid inlet / outlet 312 at the vehicle end can be composite sockets provided in the vehicle charging connection device 310 for connecting to the composite plugs in the composite gun.

[0101] It should be understood that, for ease of description and understanding, the embodiments of this application are described using the example of a liquid cooling device 420 being disposed outside the charging device 410.

[0102] In this embodiment, the on-board charging connection device 310 has a vehicle-side charging input interface 311 for electrical connection with the charging device 410, and a vehicle-side liquid inlet / outlet 312 for connection with the 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 directly connected to both the charging device 410 and the liquid cooling device 420 simultaneously via the on-board charging connection device 310. This allows the charging device 410 to charge the electric vehicle 300 at high power while the external liquid cooling device 420 cools the power battery 320 of the electric vehicle 300, meeting the heat dissipation requirements of the power battery 320 during high-power charging, thus facilitating high-power charging of the electric vehicle 300 by the charging device 410. Furthermore, by placing the vehicle-side charging input interface 311 and the vehicle-side liquid inlet / outlet 312 on the on-board charging connection device 310, the difficulty and cost of modifying the entire electric vehicle 300 are reduced.

[0103] In addition, by using external liquid cooling equipment 420 to cool the power battery 320, the electric vehicle 300 does not need an additional cooling system for the power battery 320, thus avoiding an increase in the overall vehicle weight and helping to reduce the manufacturing cost of the electric vehicle 300 and the difficulty of developing the entire vehicle system.

[0104] The on-board charging connection device 310 and the charging pile 400 in the charging system 200 will be described in detail below.

[0105] Figure 4 and Figure 5 These are schematic diagrams of the structure of an electric vehicle 300 including an on-board charging connection device 310, provided in the embodiments of this application.

[0106] Combination Figure 4 and Figure 5 The electric vehicle 300 may include an on-board charging connection device 310, a power battery 320, and a thermal management system 330.

[0107] The vehicle-mounted charging connection device 310 includes at least one vehicle-side charging input interface 311, a vehicle-side charging output interface 312, a first liquid inlet / outlet 312, and a second liquid inlet / outlet 314. Each vehicle-side charging input interface 311 is electrically connected to the vehicle-side charging output interface 312. The vehicle-side charging input interface 311 can be used to electrically connect to the charging device 410, for example, it can be connected to... Figure 2 The charging device 410 shown has a charging output interface 411 at the charging pile end that is electrically connected, and a charging output interface 312 at the vehicle end that can be electrically connected to the power battery 320, so that the charging device 410 can charge the power battery 320 through the vehicle charging connection device 310.

[0108] The first liquid inlet / outlet 312 and the second liquid inlet / outlet 314 are connected by a pipeline. The first liquid inlet / outlet 312 can be used to connect to an external liquid cooling device, for example, it can be connected to... Figure 2 The liquid cooling device 420 shown has a pile end inlet / outlet 421 connected to a second inlet / outlet 314 which can be used to connect to a 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 can use the liquid phase cooling medium transmitted by the liquid cooling device 420 to cool the power battery 320.

[0109] It is understood that, in the embodiments of this application, the first liquid inlet / outlet 312 may be... Figure 2 and Figure 3 The vehicle end liquid inlet / outlet 312 is shown.

[0110] In this embodiment, by providing a vehicle-side charging input interface 311, a vehicle-side charging output interface 312, a first liquid inlet / outlet 312, and a second liquid inlet / outlet 314 in the on-board charging connection device 310, the power battery 320 in the electric vehicle 300 can be connected to the charging equipment and the external liquid cooling equipment via the on-board charging connection device 310. In this way, when the electric vehicle 300 is charging at high power via the charging equipment, the external liquid cooling equipment can be used to cool the power battery 320, meeting the heat dissipation requirements of the power battery 320 during high-power charging, thus facilitating high-power charging of the electric vehicle 300.

[0111] In some embodiments, the number of vehicle-side charging input interfaces 311 and the number of first liquid inlet / outlet ports 312 can each 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 / outlet ports 312 is one. The multiple vehicle-side charging input interfaces 311 can be multiple charging sockets, and the first liquid inlet / 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 / outlet ports 312 can each be multiple and correspond one-to-one, and each vehicle-side charging input interface 311 can be integrated with its corresponding first liquid inlet / outlet port 312 into a composite socket.

[0112] For ease of description and understanding, this application embodiment uses the example of multiple vehicle-side charging input interfaces 311 and one first liquid inlet / outlet port 312 for illustration.

[0113] In this embodiment, the number of vehicle-side charging input interfaces 311 and first liquid inlet / outlet ports 312 can be flexibly set on the on-board charging connection device 310 to meet different production and design requirements. Furthermore, the design of the number of vehicle-side charging input interfaces 311 and first liquid inlet / outlet ports 312 only involves modifications to the on-board charging connection device 310, resulting in minimal changes to the overall electric vehicle 300, which helps reduce the development difficulty and timeline of the electric vehicle 300.

[0114] Continue reading Figure 4 In some embodiments, to ensure the normal charging of the electric vehicle 300 by the charging device 410, 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 312 via positive and negative DC power transmission cables 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 charging device 410. Figure 2 The connection status of the charging output interface 411 at the charging terminal of the charging device 410 shown.

[0115] It is understandable 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 ​​can indicate different connection states between the vehicle-side charging input interface 311 and the charging output interface 411 at the charging pile.

[0116] In specific implementations, in some embodiments, the on-board charging connection device 310 may further include an on-board charging connection controller 315, which can be electrically connected to the vehicle-side charging CC interface 3112. The on-board charging connection controller 315 can be used to: detect the voltage signal of the vehicle-side charging CC interface 3112, and determine the connection status between the vehicle-side charging input interface 3112 and the charging device 410 based on the voltage signal of the vehicle-side charging CC interface 3112.

[0117] 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 charging output interface 411 at the charging pile 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 charging output interface 411 at the charging pile are connected.

[0118] It is understood that, in the embodiments of this application, the on-board charging connection controller 315 may be any one of a central processor (CPU), a network processor (NP), a digital signal processor (DSP), a micro controller unit (MCU), and a programmable logic device (PLD).

[0119] Continue reading 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 / 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 / outlet 314 may include a second liquid inlet interface 3141 and a second liquid outlet interface 3142.

[0120] The first liquid inlet port 3121 is connected to the second liquid outlet port 3142, and the first liquid outlet port 3122 is connected to the second liquid inlet port 3141. The second liquid outlet port 3142 and the second liquid inlet port 3141 can be connected to the thermal management system 330 respectively. The first liquid inlet port 3121 receives the liquid cooling medium from the liquid cooling device 420 and transmits it to the thermal management system 330 through the second liquid outlet port 3142. This allows the liquid cooling medium to exchange heat with the power battery 320 through the thermal management system 330, thereby cooling the power battery 320. The liquid cooling medium in the thermal management system 330 can be transmitted to the on-board charging connection device 310 through the second liquid inlet port 3141, and further transmitted to the liquid cooling device 420 through the first liquid outlet port 3131, thus forming a cooling cycle of the liquid cooling medium for the power battery 320. The voltage signal of the vehicle-side cooling CC interface 3123 can be used to indicate the connection status between the first liquid inlet / outlet 312 and the liquid cooling device 420. For example, it can indicate the connection status between the first liquid inlet / outlet 312 and the liquid cooling device 420. Figure 4 The connection status of the liquid inlet / outlet 421 at the pile end of the liquid cooling device 420 shown.

[0121] In specific implementations, in some embodiments, the on-board charging connection controller 315 can be used to: detect the voltage signal of the vehicle-side cooling CC interface 3123, and determine the connection status of the first liquid inlet / outlet 312 and the liquid cooling device 420 based on the voltage signal of the vehicle-side cooling CC interface 3123.

[0122] It is understandable 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. Different voltage values ​​indicate different connection states between the first inlet / outlet port 312 and the pile-side inlet / outlet port 421. For example, when the on-board charging connection controller 315 detects a voltage value of 0 for the vehicle-side cooling CC interface 3123, it can indicate that the first inlet / outlet port 312 is not connected to the pile-side inlet / outlet port 421; when the on-board charging connection controller 315 detects a voltage value of 4V for the vehicle-side cooling CC interface 3123, it can indicate that the first inlet / outlet port 312 is connected to the pile-side inlet / outlet port 421.

[0123] It is understood that the above-mentioned determination of the connection status between the vehicle-side charging input interface 311 and the charging output interface 411, and the connection status between the first liquid inlet / outlet 312 and the liquid inlet / outlet 421 based on 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.

[0124] Continue reading Figure 4 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.

[0125] The charging circuit contactor 3100 can be used to disconnect or connect the power transmission circuit between the vehicle-side DC interface 3111 and the power battery 320, which are electrically connected to the charging circuit contactor 3100. 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.

[0126] For example, the on-board 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, which is 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.

[0127] In this embodiment, the power transmission circuit between the charging device 410 and the power battery 320 is disconnected or connected by the charging circuit contactor 3100 provided in the vehicle charging connection device 310. The charging circuit contactor 3100 can be controlled by the vehicle charging connection device 310, which helps to reduce the modification of the charging control function of the electric vehicle 300 itself caused by the multiple vehicle-end charging input interfaces 311 provided on the vehicle charging connection device 310. This results in less modification to the entire electric vehicle 300 and helps to reduce the development difficulty and cycle of the electric vehicle 300.

[0128] In one example, to provide short-circuit protection for the power transmission loop between the vehicle-side DC interface 3111 and the vehicle-side charging output interface 313, the on-board charging connection device 310 also 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. Specifically, the fuse FU can be used to disconnect the power transmission loop between the vehicle-side DC interface 3111 and the vehicle-side charging output interface 313 electrically connected to the fuse FU when the current transmitted to the fuse FU exceeds a preset current.

[0129] Optionally, the fuse FU can be electrically connected to the positive DC power transmission cable or to the negative DC power transmission cable; or, it can be electrically connected to the negative DC power transmission cable.

[0130] In other embodiments, see Figure 5 The electric vehicle 300 may also include a high-voltage distribution unit 350, which can be electrically connected between the vehicle-side charging output interface 313 and the power battery 320. The on-board charging connection device 310 may not include a charging circuit contactor 3100; the power transmission circuit between the charging device 410 and the power battery 320 can be disconnected or connected via the charging circuit contactor 351 located in the high-voltage distribution unit 350.

[0131] Specifically, see Figure 5 The high-voltage distribution unit 350 may include a charging circuit contactor 351. The vehicle-side DC interface 3111 of each 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 between the vehicle-side charging output interface 313 and the power battery 320, respectively.

[0132] It is understood that, in this embodiment of the application, compared to setting a charging circuit contactor 3100 in the on-board charging connection device 310, directly using the charging circuit contactor 351 set in the high voltage distribution unit 350 of the electric vehicle 300 to disconnect or connect the power transmission circuit between the charging device 410 and the power battery 320 is beneficial to reducing the size of the on-board charging connection device 310 and to miniaturizing the on-board charging connection device 310.

[0133] In some embodiments, see Figure 5 The on-board charging connection controller 315 can be electrically connected to the charging circuit contactor 351 and is used to control the opening and closing state of the charging circuit contactor 351 to disconnect or connect the power transmission circuit between the vehicle-end charging output interface 313 and the power battery 320.

[0134] In other embodiments, see Figure 5 The electric vehicle 300 may also 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 is used to control the opening and closing state 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.

[0135] Understandably, in practical implementation, the on-board charging connection device 310 can communicate with the vehicle control system 340. Specifically, the on-board charging connection controller 315 can communicate with the vehicle control system 340. For example, the on-board charging connection controller 315 can communicate with the vehicle controller 341 and the battery management system 342 via a controller area network (CAN), thereby exchanging signals when the power battery 320 has charging or other needs. For instance, the vehicle controller 341 can receive relevant information about the power battery 320 sent by the battery management system 342, such as the power battery 320's charging and cooling needs, and send the acquired 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.

[0136] Continue reading Figure 4In some embodiments, the on-board charging connection device 310 may further include a temperature sensor 316 for the vehicle-side DC interface. The temperature sensor 316 for the vehicle-side DC interface may be used to detect at least one of the following temperatures: the temperature of the vehicle-side DC interface 3111, and the temperature of the power transmission cable electrically connected to the vehicle-side DC interface 3111.

[0137] Specifically, the number of temperature sensors 316 at the vehicle-end DC interface can be the same as the number of vehicle-end charging input interfaces 311 and correspond one-to-one. Each temperature sensor 316 at the vehicle-end DC interface can be set close to the corresponding vehicle-end DC interface 3111 and is 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.

[0138] In practical implementation, the vehicle-side charging controller 315 can be electrically connected to the temperature sensor 316 of the vehicle-side DC interface. The vehicle-side charging controller 315 can acquire the temperature detected by the temperature sensor 316 of the vehicle-side DC interface to achieve real-time monitoring and alarm functions for 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.

[0139] 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 liquid inlet / outlet 312 and the second liquid inlet / outlet 314 in the vehicle-mounted charging connection device 310.

[0140] Continue to combine Figure 4 and Figure 5In some embodiments, the on-board charging connection device 310 may further include an inlet pipe 317 and an outlet pipe 318. The two ends of the inlet pipe 317 are connected to a first inlet port 3121 and a second outlet port 3142, respectively, and the two ends of the outlet pipe 318 are connected to a first outlet port 3122 and a second inlet port 3141, respectively. The inlet pipe 317 is used to transfer the liquid cooling medium from the liquid cooling device 420 through the first inlet port 3121 to the second outlet port 3142, and then through the second outlet port 3142 from the on-board charging connection device 310 to the thermal management system 330, allowing the liquid cooling medium to exchange heat with the power battery 320 via the thermal management system 330. The liquid outlet pipe 318 can be used to transfer the liquid phase cooling medium received in the thermal management system 330 through the second liquid inlet port 3141 to the liquid cooling device 420 through the first liquid outlet port 3122, so that the liquid cooling device 420 can cool the transferred liquid phase cooling medium, thereby forming a cooling cycle of the liquid phase cooling medium in the thermal management system 330.

[0141] In some embodiments, when the power battery 320 needs to be heated by the thermal management system 330, the liquid inlet pipe 317 can also be used to transfer the liquid phase heating medium from the liquid cooling device 420 through the first liquid inlet port 3121 to the second liquid outlet port 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 pipe 318, so that the liquid cooling device 420 can heat the liquid phase cooling medium after heat exchange, thereby forming a heating cycle of the liquid phase heating medium in the thermal management system 330.

[0142] In some other embodiments, a separate pipeline for transmitting the liquid phase heating medium may also be provided between the first liquid inlet / outlet 312 and the second liquid inlet / outlet 314.

[0143] For example, Figure 6 This is a schematic diagram of the structure of an electric vehicle 300 provided in this application embodiment, which has a separate pipeline structure for transmitting liquid phase heating medium between the first liquid inlet / outlet 312 and the second liquid inlet / outlet 314.

[0144] See Figure 6 ,and Figure 4 and Figure 5The difference in this embodiment is that the on-board charging connection device 310 may include an inlet pipe 317, an outlet pipe 318, and a heated inlet pipe 3100. The two ends of the inlet pipe 317 and the two ends of the heated inlet pipe 3100 can be connected to a first inlet port 3121 and a second outlet port 3142, respectively. The two ends of the outlet pipe 318 are connected to the first outlet port 3122 and the second inlet port 3141, respectively.

[0145] The liquid inlet pipe 317 is used to transfer the liquid-phase cooling medium from the liquid cooling device 420 through the first liquid inlet port 3121 to the second liquid outlet port 3142, and then through the second liquid outlet port 3142 to the on-board charging connection device 310 to the thermal management system 330, so that the liquid-phase cooling medium cools the power battery 320 through the thermal management system 330. The heating liquid inlet pipe 3100 can be used to transfer the liquid-phase heating medium from the liquid cooling device 420 through the first liquid inlet port 313 to the second liquid outlet port 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 pipe 318 can be used to transfer the liquid phase cooling medium or liquid phase heating medium received in the thermal management system 330 through the second liquid inlet port 3141 to the liquid cooling device 420 through the first liquid outlet port 3122, thereby forming a cooling cycle of the liquid phase cooling medium in the thermal management system 330, or forming a heating cycle of the liquid phase heating medium in the thermal management system 330.

[0146] In specific implementations, in some embodiments, such as Figure 6 As shown, the on-board charging connection device 310 may further include a shut-off valve 3300 and a shut-off valve 3400. The shut-off valve 3300 can be connected to the liquid inlet pipe 317 and is used to control the opening or closing of the liquid inlet pipe 317. The shut-off valve 3400 can be connected to the heating liquid inlet pipe 3100 and is used to control the opening or closing of the heating liquid inlet pipe 3100. When the liquid cooling device 420 transmits liquid-phase cooling medium from the first liquid inlet port 3121, the shut-off valve 3300 can be opened and the shut-off valve 3400 can be closed, allowing the liquid-phase cooling medium to be transmitted through the liquid inlet pipe 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 shut-off valve 3400 can be opened and the shut-off valve 3300 can be closed, allowing the liquid-phase cooling medium to be transmitted through the heating liquid inlet pipe 3100 to the second liquid outlet port 3142.

[0147] In some embodiments, continue reading Figure 6 ,and Figure 4 and Figure 5The difference in the illustrated embodiment is that, in order to improve the power delivered from the on-board charging connection device 310 to the power battery 320, the vehicle-side DC interface 3111 and the vehicle-side charging output interface 313 can be electrically connected by multiple pairs of positive and negative DC power cables.

[0148] In some embodiments, see Figure 6 To further cool 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 may also include a heat exchange structure 3200. The heat exchange structure 3200 may be connected to the liquid inlet pipe 317. Thus, when the liquid inlet pipe 317 transmits liquid phase cooling medium, the liquid phase cooling medium can exchange heat with the vehicle-side DC interface 3111 and the power transmission cable electrically connected to the vehicle-side DC interface 3111 through the heat exchange structure 3200 to cool the vehicle-side DC interface 3111 and the power transmission cable electrically connected to the vehicle-side DC interface 3111.

[0149] For example, the heat exchange structure 3200 can be a flow pipe with heat conduction properties. This flow pipe can be thermally connected to the vehicle-side DC interface 3111 and the power transmission cable electrically connected to the vehicle-side DC interface 3111. The heat generated by the vehicle-side DC interface 3111 and the power transmission cable electrically connected to the vehicle-side DC interface 3111 can be thermally conducted to the heat exchange structure 3200. The heat exchange structure 3200 can be connected to the liquid inlet pipe 317, so that when the liquid phase cooling medium transmitted through the liquid inlet pipe 317 flows through the flow pipe, it can absorb the heat on the heat exchange structure 3200. The liquid phase cooling medium after absorbing heat can be transferred to the thermal management system 330 through the second liquid outlet port 3142 to continue cooling the power battery 320.

[0150] It is understood that the specific structure of the heat exchange structure 3200 described above is only schematic. In the embodiments of this application, as long as the heat exchange structure 3200 can be connected to the liquid inlet pipe 317 and can enable the liquid phase cooling medium transmitted by the liquid inlet pipe 317 to exchange heat with the vehicle-end DC interface 3111 and the power transmission cable electrically connected to the vehicle-end DC interface 3111.

[0151] Continue to combine Figure 4 and Figure 5 In some embodiments, the on-board charging connection device 310 may further include a temperature sensor 319 for a first liquid inlet / outlet. The temperature sensor 319 for the first liquid inlet / outlet can be used to detect the temperature of the first liquid inlet / outlet 312.

[0152] Specifically, the temperature sensor 319 of the first inlet / outlet can be set close to the first inlet / outlet 312 and used to detect the temperature of the liquid medium flowing through the first inlet / outlet 312, for example, to detect the temperature of the liquid cooling medium or the liquid heating medium.

[0153] In practical implementation, the on-board charging connection controller 315 can be electrically connected to the temperature sensor 319 of the first liquid inlet / outlet. The on-board charging connection controller 315 can acquire the temperature detected by the temperature sensor 319 of the first liquid inlet / outlet, thereby enabling real-time monitoring and alarm of the temperature of the liquid medium flowing through the first liquid inlet / outlet 312.

[0154] The on-board charging connection device 310 provided in this application embodiment has been described above. When the on-board charging connection device 310 is applied to an electric vehicle 300, the on-board charging connection device 310 can transmit liquid cooling medium (or liquid heating medium) from an external liquid cooling device to the thermal management system 330 of the electric vehicle 300, so that the thermal management system 330 can use the transmitted liquid cooling medium to cool the power battery 320 in the electric vehicle 300. The specific pipeline structure of the thermal management system 330 for cooling the power battery 320 using the liquid cooling medium from the external liquid cooling device will be further described below with reference to the accompanying drawings.

[0155] Figure 7 This is a schematic diagram of the connection between an on-board charging connection device 310, a power battery 320, and a thermal management system 330 provided in an embodiment of this application.

[0156] See Figure 7 The thermal management system 330 may include a first vehicle-end cooling circuit 331, a second vehicle-end cooling circuit 332, a first heat exchanger 333, and a cooling assembly 334.

[0157] 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, and the first cooling circuit 331 can exchange heat with the second cooling circuit 332 through the first heat exchanger 333.

[0158] Specifically, a first liquid working fluid circulates in the first cooling circuit 331, and a second liquid working fluid circulates in the second cooling circuit 332. That is, the first liquid working fluid circulates in the first heat exchange channel 333a of the first heat exchanger 333, and the second liquid working fluid 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 fluid in the second cooling circuit 332 flows into the power battery 320 and absorbs the heat generated by the power battery 320. Then, the heated second liquid working fluid flows out of the power battery 320 to carry the heat generated by the power battery 320 into the second cooling circuit 332. When the heated second liquid working fluid is transferred to the second heat exchange channel 333b in the second cooling circuit 332, it can exchange heat with the first liquid working fluid circulating in the first heat exchange channel 333a through the first heat exchange channel 333a, thereby transferring heat to the first liquid working fluid and cooling the second liquid working fluid.

[0159] The cooled second liquid working fluid can circulate in the second cooling circuit 332 and flow back into the power battery 320. Meanwhile, the first liquid working fluid, 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 on-board cooling device 335 connected to the first cooling circuit 331. The on-board cooling device 335 can cool the first liquid working fluid circulating in the first cooling circuit 331, thereby achieving a cooling cycle for the power battery 320 by the thermal management system 330.

[0160] 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-described structure of the vehicle-mounted cooling device 335 is merely illustrative; in the embodiments described, the structure of the vehicle-mounted cooling device 335 is sufficient to cool the first liquid working fluid circulating in the first cooling circuit 331.

[0161] In some embodiments, the thermal management system 330 may further include a thermistor 336, which may be connected to the second cooling circuit 332 and used to monitor the temperature of the second liquid working fluid flowing in the second cooling circuit 332.

[0162] It is also understandable that, in practical implementation, the power battery 320 may be equipped with flow channels to allow for the circulation of the second liquid working fluid. For example, Figure 8 This is an exemplary schematic diagram of a power battery 320 with flow channels.

[0163] See Figure 8The power battery 320 may include a casing 321, a liquid cooling plate 322, and multiple battery modules 323. The casing 321 and the liquid cooling plate 322 can form a receiving space, in which the multiple battery modules 323 are connected in series and / or in parallel and placed, and are thermally connected to the liquid cooling plate 322. The liquid cooling plate 322 is provided with a flow pipe 3221. The flow pipe 3221 can be connected to a second cooling circuit 332, so that the second liquid working fluid in the second cooling circuit 332 can flow in the flow pipe 3221. In this way, the heat generated by the multiple battery modules 323 can be transferred to the liquid cooling plate 322 by heat conduction, and then absorbed by the second liquid working fluid flowing in the flow pipe 3221. The second liquid working fluid, after absorbing heat, flows out from the flow pipe 3221 to carry the heat generated by the multiple battery modules 323 out of the power battery 320.

[0164] It is understood that the structure of the power battery 320 with liquid cooling plate 322 described above is only schematic. In the embodiments of this 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 is acceptable.

[0165] Continue reading Figure 7 The cooling assembly 334 may include a coolant inlet pipe 3341 and a coolant outlet pipe 3342. The coolant inlet pipe 3341 and the coolant outlet pipe 3342 are respectively used to connect to external liquid cooling equipment, such as... Figure 4 The liquid cooling device 420 shown is connected to form a third cooling circuit with the external liquid cooling device. This third cooling circuit is used to cool the power battery 320.

[0166] In one example, see below. Figure 7 One end of the cooling inlet pipe 3341 is connected to the second outlet port 3142, and the other end of the cooling inlet pipe 3341 is connected to the input terminal of the power battery 320. One end of the cooling outlet pipe 3342 is connected to the second inlet port 3141, and the other end of the cooling outlet pipe 3342 is connected to the output terminal of the power battery 320.

[0167] Specifically, the other end of the cooling inlet pipe 3341 can be connected to the input end of the power battery 320 connected in the second cooling circuit 332, and the other end of the cooling outlet pipe 3342 can be connected to the output end of the power battery 320 connected in the second cooling circuit 332, thereby connecting the cooling inlet pipe 3341 and the other end of the cooling outlet pipe 3342 to the second cooling circuit 332.

[0168] In practical implementation, the liquid cooling medium transmitted by the liquid cooling device 420 can first be transmitted to the on-board charging connection device 310 through the first liquid inlet 3121, and then flow from the on-board charging connection device 310 into the second cooling circuit 332 where the power battery 320 is located through the second liquid outlet 3142 and the cooling liquid inlet pipe 3341. The liquid cooling medium flows in the second cooling circuit 332 and into the power battery 320, for example, into the flow pipe 3221 in the liquid cooling plate 322 as shown in Figure 7. The liquid cooling medium can flow in the flow pipe 3221 of the liquid cooling plate 322 and absorb the heat generated by the multiple battery modules 323. After absorbing heat, the liquid cooling medium flows out from the power battery 32 and flows into the on-board charging connection device 310 through the cooling outlet pipe 352 from the second outlet port 3142. Then it is transferred from the first outlet port 3122 of the on-board charging connection device 310 to the liquid cooling device 420 outside the vehicle to remove the heat generated by the power battery 320 from the electric vehicle 300, thereby cooling the power battery 320.

[0169] In some embodiments, in order to drive the liquid cooling medium after absorbing heat from the power battery 320 into the cooling outlet pipe 3342, the thermal management system further 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.

[0170] It is understood that, in the above embodiments, since the liquid cooling medium transmitted by the liquid cooling device 420 flows 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 medium in the second cooling circuit 332, the liquid cooling medium and the second liquid working medium can be the same liquid, for example, both can be cooling water.

[0171] In some embodiments, the under-vehicle cooling system of the power battery 320, formed by the cooling inlet pipe 3341, the cooling outlet pipe 3342, and the external liquid cooling device 420, 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.

[0172] For example, in one possible example, see [link to article]. Figure 7 The cooling assembly 334 may also include a first three-way valve 3343 and a second three-way valve 3344.

[0173] In this system, one end of the power battery 320 and one end of the second heat exchange channel 333b are connected via a first three-way valve 3343, and 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 pipe 3341 is connected to an external liquid cooling device, such as liquid cooling device 420, and the other end of the cooling inlet pipe 3341 is connected to one end of the power battery 320 via the first three-way valve 3343. One end of the cooling outlet pipe 3342 is connected to an external liquid cooling device, such as liquid cooling device 420, and the other end of the cooling outlet pipe 3342 is connected to the other end of the power battery 320 via the second three-way valve 3344, thus forming a third cooling circuit. Therefore, the under-vehicle cooling system of the power battery 320, formed by the cooling inlet pipe 3341, the cooling outlet pipe 3342, and the liquid cooling device 420, is connected in parallel with the on-vehicle cooling system of the power battery 320.

[0174] 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 pipe 3341, and the third valve port of the second three-way valve 3344 is connected to the other end of the heat exchange outlet pipe 3342.

[0175] In specific implementation, when the electric vehicle 300 is not connected to the external liquid cooling equipment 420 through the on-board charging connection device 310, the first and second valve ports of the first three-way valve 3343 and the first and second valve ports of the second three-way valve 3344 can be controlled to be open, 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 closed. 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.

[0176] When the electric vehicle 300 is connected to the external liquid cooling device 420 via the on-board charging connection device 310, the second and third valve ports of the first three-way valve 3343 and the second and third valve ports of the second three-way valve 3344 can be controlled to be open, while the first valve port of the first three-way valve 3343 and the first valve port of the second three-way valve 3344 are closed. 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 inlet pipe 3341, the cooling outlet pipe 3342 and the external liquid cooling device 420.

[0177] In this embodiment, the external cooling system of the power battery 320 formed by the cooling component 334 and the external liquid cooling device 420 can be connected in parallel with the onboard cooling system of the power battery 320 in the thermal management system 330, which helps to reduce the control complexity of the two cooling systems.

[0178] Figure 9 This is a schematic diagram of the connection between another vehicle-mounted charging connection device 310, power battery 320 and thermal management system 330 provided in the embodiments of this application.

[0179] and Figure 7 The difference between the illustrated embodiment and the one shown is that, in Figure 9 In the embodiment shown, the under-vehicle cooling system of the power battery 320 formed by the cooling inlet pipe 3341, the cooling outlet pipe 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.

[0180] The first three-way valve 3343, the second three-way valve 3344, the power battery 320, and the second heat exchange channel 333b are sequentially connected to the second cooling circuit 332. One end of the cooling liquid inlet pipe 3341 is used to connect to an external liquid cooling device, such as... Figure 4 The liquid cooling device 420 shown is connected, and the other end of the cooling inlet pipe 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 outlet pipe 3342 is used to connect to an external liquid cooling device, such as... Figure 4 The liquid cooling device 420 shown is connected, and the other end of the cooling liquid outlet pipe 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.

[0181] 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 sequentially 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. The third valve port of the first three-way valve 3343 is connected to the other end of the cooling liquid inlet pipe 3341, and the third valve port of the second three-way valve 3344 is connected to the other end of the cooling liquid outlet pipe 3342.

[0182] In specific implementation, when the electric vehicle 300 is not connected to the external liquid cooling equipment 420 through the on-board charging connection device 310, the first and second valve ports of the first three-way valve 3343 and the first and second valve ports of the second three-way valve 3344 can be controlled to be open, 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 closed. 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.

[0183] When the electric vehicle 300 is connected to the external liquid cooling equipment 420 via the on-board charging connection device 310, the first and third valve ports of the first three-way valve 3343 and the first and third valve ports of the second three-way valve 3344 can be controlled to be open, while the second valve port of the first three-way valve 3343 and the second valve port of the second three-way valve 3344 are closed. At this time, the thermal management system 330 can simultaneously cool the power battery 320 through the under-vehicle cooling system of the power battery 320 formed by the cooling inlet pipe 3341, the cooling outlet pipe 3342 and the external liquid cooling equipment 420, and the on-vehicle cooling system of the power battery 320 formed by the first cooling circuit 331 and the second cooling circuit 332.

[0184] In this embodiment, the external cooling system of the power battery 320 formed by the cooling component 334 and the external liquid cooling device 420 can be connected in series with the on-board cooling system of the power battery 320 in the thermal management system 330. Thus, when the power battery 320 is cooled by the liquid cooling device 420, the thermal management system 330 can simultaneously utilize the under-board cooling system and the on-board cooling system of the power battery 320 to cool the power battery at the same time, thereby further improving the cooling efficiency of the power battery 320. This is beneficial to meeting the heat dissipation requirements of the power battery 320 during high-power charging and to realizing high-power charging of the electric vehicle 300.

[0185] Continue reading Figure 9 In some embodiments, to ensure the 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 bidirectional shut-off valve 3347. The vehicle-end bidirectional shut-off valve 3347 can be connected to the second cooling circuit 332 and is 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, for opening or closing the second cooling circuit 332 between the second valve ports of the first three-way valve 3343 and the second valve port of the second three-way valve 3344.

[0186] In practical implementation, when the electric vehicle 300 is not connected to the external liquid cooling equipment 420 via the on-board charging connection device 310, the vehicle-end bidirectional shut-off valve 3347 can be opened, allowing the thermal management system 330 to 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. When the electric vehicle 300 is connected to the external liquid cooling equipment 420 via the on-board charging connection device 310, the vehicle-end bidirectional shut-off valve 3347 can be closed, allowing the thermal management system 330 to cool the power battery 320 through the under-vehicle cooling system of the power battery 320 formed by the series-connected cooling inlet pipe 3341, cooling outlet pipe 3342, and external liquid cooling equipment 420.

[0187] Figure 10 This is a schematic diagram of the connection between the on-board charging connection device 310, the power battery 320, and the thermal management system 330 provided in another embodiment of this application.

[0188] and Figures 7 to 9 The difference between the illustrated embodiment and the one shown is that, in Figure 10 In the illustrated embodiment, the cooling assembly 334 may include a cooling inlet pipe 3341, a cooling outlet pipe 3342, and a second heat exchanger 3346. The second heat exchanger 3346 may include two vehicle-end channels 3346a and 3346b, with heat exchange channel 3346b connected to the second cooling circuit 332. One end of the cooling inlet pipe 3341 and one end of the cooling outlet pipe 3342 are respectively used to connect to external liquid cooling equipment, such as… Figure 4 The liquid cooling device 420 shown is connected, and the other end of the cooling liquid inlet pipe 3341 and the other end of the cooling liquid outlet pipe 3342 are respectively connected to the two ends of the heat exchange channel 3346a to form a third cooling circuit. The third cooling circuit can exchange heat with the second liquid working fluid flowing in the second cooling circuit 332 through the second heat exchanger 3346 to cool the power battery 320.

[0189] In practical 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 on-board charging connection device 310 and the cooling inlet pipe 3341. The second liquid working fluid in the second cooling circuit 332 flows into the power battery 320 to absorb the heat generated by the power battery 320 and then flows out of the power battery 320, so as to carry the heat of the power battery 320 into the second cooling circuit 332. When the second liquid working fluid carrying heat is transferred 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 to transfer heat to the liquid cooling medium, thereby achieving the cooling of the second liquid working fluid.

[0190] The cooled second liquid working fluid can circulate in the second cooling circuit 332 and flow back into the power battery 320. The liquid cooling medium that has absorbed heat can flow into the on-board charging connection device 310 through the cooling outlet pipe 3342, and then be transferred from the first outlet port 3122 of the on-board charging connection device 310 to the external liquid cooling device 420 to remove the heat generated by the power battery 320 from the electric vehicle 300, thereby cooling the power battery 300.

[0191] In this embodiment, the power battery 320 is cooled by exchanging heat between the liquid cooling medium transmitted from the liquid cooling device 420 to the liquid cooling management system 330 and the second liquid working fluid in the second cooling circuit 332. This avoids the problem of the liquid cooling medium transmitted from the liquid cooling device 420 flowing into the second cooling circuit 332 and affecting the purity of the second liquid working fluid in the second cooling circuit 332, thus ensuring the cooling effect of the thermal management system 330 on the power battery 320.

[0192] Figure 11 This is a schematic diagram of the connection between the on-board charging connection device 310, the power battery 320, and the thermal management system 330 provided in another embodiment of this application.

[0193] and Figures 7 to 10 The difference between the illustrated embodiment and the one shown is that, in Figure 11 In the illustrated embodiment, the cooling assembly 334 may include a cooling inlet pipe 3341 and a cooling outlet pipe 3342, and the first heat exchanger 333 may further include a third heat exchange channel 333c. One end of the cooling inlet pipe 3341 and one end of the cooling outlet pipe 3342 are respectively used to connect to an external liquid cooling device, such as... Figure 4 The liquid cooling device 420 shown is connected, and the other end of the cooling liquid inlet pipe 3341 and the other end of the cooling liquid outlet pipe 3342 are respectively connected to the two 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 fluid flowing in the second cooling circuit 332 through the first heat exchanger 333 to cool the power battery 320.

[0194] In practical implementation, the liquid cooling medium transmitted by the liquid cooling device 420 can flow into the heat exchange intermediate pipe 3345 through the on-board charging connection device 310 and the cooling liquid inlet pipe 3341, and then into the third vehicle end channel 333c of the first heat exchanger 333 connected in the heat exchange intermediate pipe 3345. The second liquid working fluid in the second cooling circuit 332 flows into the power battery 320 to absorb the heat generated by the power battery 320 and then flows out from the power battery 320, so as to carry the heat of the power battery 320 into the second cooling circuit 332. When the second liquid working fluid carrying heat is transferred 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, so as to transfer heat to the liquid cooling medium, thereby realizing the cooling of the second liquid working fluid.

[0195] The cooled second liquid working fluid can circulate in the second cooling circuit 332 and flow back into the power battery 320. The liquid cooling medium that has absorbed heat can flow into the on-board charging connection device 310 through the cooling outlet pipe 3342, and then be transferred from the first outlet port 3122 of the on-board charging connection device 310 to the external liquid cooling device 420 to remove the heat generated by the power battery 320 from the electric vehicle 300, thereby cooling the power battery 300.

[0196] In this embodiment, the power battery 320 is cooled by exchanging heat between the liquid cooling medium transmitted from the liquid cooling device 420 to the liquid cooling management system 330 and the second liquid working fluid in the second cooling circuit 332. This avoids the problem of the liquid cooling medium transmitted from the liquid cooling device 420 flowing into the second cooling circuit 332 and affecting the purity of the second liquid working fluid in the second cooling circuit 332, thus ensuring the cooling effect of the thermal management system 330 on the power battery 320.

[0197] The above describes the on-board charging connection device 310 in the charging system 200 provided in the embodiments of this application. The structure of the charging pile 400 side in the charging system 200 will be described in detail below.

[0198] See Figure 12 The charging pile 400 may include a charging device 410 and a liquid cooling device 420.

[0199] The charging device 410 may include a charging terminal interface 411, which can be used to electrically connect to the electric vehicle 300, for example, with... Figure 4The on-board charging connection device 310 in the electric vehicle 300 shown is electrically connected to the vehicle-side charging interface 311, allowing the charging device 410 to output DC power to the power battery 320 via 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 interface 411 may be the charging plug of a charging gun electrically connected to each charging terminal 413.

[0200] The liquid cooling device 420 may include a liquid inlet / outlet 421 at the pile end, which can be used to connect to the electric vehicle 300, for example, with... Figure 4 The on-board charging connection device 310 in the electric vehicle 300 shown is connected via a first liquid inlet / outlet port 312, allowing the liquid cooling device 420 to transmit liquid-phase cooling medium to the thermal management system 330 through the on-board charging connection device 310. This enables the thermal management system 330 to cool the power battery 320 using the liquid-phase cooling medium transmitted by the liquid cooling device 420. 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 terminal liquid inlet / outlet port 421 may be a liquid cooling plug for each liquid cooling gun connected to the device body 422.

[0201] In this embodiment of the application, the charging pile 400 is provided with a charging device 410 and a liquid cooling device 420. When the charging device 410 is charging the electric vehicle 300 at high power, the liquid cooling device 420 can also transfer a liquid cooling medium to the electric vehicle 300. This allows the electric vehicle 300 to use the transferred liquid cooling medium to cool the power battery 320, thereby meeting the heat dissipation requirements of the power battery 320 during high-power charging and facilitating the realization of high-power charging of the electric vehicle 300 by the charging device 410.

[0202] In some embodiments, the number of charging interfaces 411 and liquid inlet / outlet ports 421 at the pile end can be one or more. In one example, there are multiple charging interfaces 411 and one liquid inlet / outlet port 421. Multiple charging interfaces 411 can be charging plugs in multiple charging guns, and the liquid inlet / outlet port 421 can be a liquid cooling plug in a liquid cooling gun. In another example, there can be multiple charging interfaces 411 and one-to-one corresponding liquid inlet / outlet ports 421, and each charging interface 411 can be integrated with its corresponding liquid inlet / outlet port 421 into a combined charging and cooling gun. For ease of description and understanding, this application embodiment uses the example of multiple charging interfaces 411 and one liquid inlet / outlet port 421 for illustration.

[0203] Continue reading Figure 12In some embodiments, to ensure the normal charging of the electric vehicle 300 by the charging device 410, the charging interface 411 at the charging pile may include a DC interface 4111 and a CC interface 4112. The DC interface 4111 can be used to output DC power to the electric vehicle 300. For example, the DC interface 4111 can be used to connect to... Figure 4 The vehicle-side DC interface 3111 shown is electrically connected to output DC power to the vehicle-side DC interface 3111, thereby charging the power battery 320 through the on-board charging connection device 310. The charging pile CC interface 4112 can specifically be connected to... Figure 4 The vehicle-side charging CC interface 3112 shown is electrically connected. The voltage signal of the charging pile CC interface 4112 can be used to indicate the connection status between the charging pile interface 411 and the electric vehicle 300; for example, it can indicate the connection between the charging pile interface 411 and... Figure 4 The connection status of the vehicle-side charging interface 311 is shown.

[0204] For specific implementation, please refer to Figure 12 In some embodiments, the charging device 410 may further include a charging pile controller 414, which can be used to: detect the voltage signal of the charging pile CC interface 4112, and determine the connection status between the charging pile interface 411 and the vehicle charging interface 311 based on the voltage signal of the charging pile CC interface 4112.

[0205] It is understandable that the voltage signal of the charging CC interface 4112 at the charging pile end can refer to the voltage value of the charging CC interface 4112 at the vehicle end, and different voltage values ​​indicate different connection states between the charging CC interface 411 at the charging pile end and the charging CC interface 311 at the vehicle end. For example, when the charging pile controller 414 detects a voltage value of 0 at the charging CC interface 4112 at the charging pile end, it can indicate that the charging CC interface 411 at the charging pile end and the charging CC interface 311 at the vehicle end are not connected; when the charging pile controller 414 detects a voltage value of 4V at the charging CC interface 4112 at the charging pile end, it can indicate that the charging CC interface 411 at the charging pile end and the charging CC interface 311 at the vehicle end are connected.

[0206] It is also understood that the charging terminal controller 414 can be installed inside the charging host 412 and electrically connected to multiple power conversion devices within the charging host 412. The charging terminal controller 414 can be used to control multiple power conversion devices to convert AC power from the external power grid into stable DC power for output.

[0207] Continue reading Figure 12Similarly, in some embodiments, to ensure the normal transmission of liquid cooling medium from the liquid cooling device 420 to the on-board charging connection device 310, the pile end liquid inlet / 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.

[0208] The pile end liquid inlet port 4211 and the pile end liquid outlet port 4212 can be used to connect to the electric vehicle 300, respectively. The pile end liquid outlet port 4212 can, for example, be connected to... Figure 4 The on-board charging connection device 310 shown is connected to the first liquid inlet 3121, and the pile end liquid inlet 4211 can, for example, be connected to... Figure 4 The first liquid outlet 3131 of the on-board charging connection device 310 in the electric vehicle 300 shown is connected.

[0209] Specifically, the pile end CC interface 4213 can be connected to... Figure 4 The vehicle-side cooling CC interface 3123 shown is electrically connected. The voltage signal of the pile-side CC interface 4213 can be used to indicate the connection status between the pile-side inlet / outlet 421 and the electric vehicle 300, for example, it can indicate the connection between the pile-side inlet / outlet 421 and the electric vehicle 300. Figure 4 The connection status of the first liquid inlet / outlet 312 of the on-board charging connection device 310 shown.

[0210] For specific implementation, please refer to Figure 12 In some embodiments, the liquid cooling device 420 may further include a pile end cooling controller 423, which can be used to: detect the voltage signal of the pile end CC interface 4213, and determine the connection status between the pile end liquid inlet / outlet 421 and the electric vehicle 300 based on the voltage signal of the pile end CC interface 4213.

[0211] It is understandable that the voltage signal of the pile end CC interface 4213 can refer to the voltage value of the pile end CC interface 4213, and different voltage values ​​indicate different connection states between the pile end inlet / outlet port 421 and the first inlet / outlet port 312. For example, when the pile end cooling controller 423 detects a voltage value of 0 for the pile end CC interface 4213, it can indicate that the pile end inlet / outlet port 421 and the first inlet / outlet port 312 are not connected; when the pile end cooling controller 423 detects a voltage value of 4V for the pile end CC interface 4213, it can indicate that the pile end inlet / outlet port 421 and the first inlet / outlet port 312 are connected.

[0212] It is 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 / outlet 312 and the pile-side liquid inlet / outlet 421 based on the pile-side charging CC interface 4112 and the pile-side cooling CC interface 4213 will be described in detail below, and will not be repeated here.

[0213] It is also understandable that the pile end cooling controller 423 can be installed inside the equipment body 422 and can be used to control the operation of the liquid cooling system inside the equipment body 422.

[0214] In other embodiments, when the liquid cooling device 420 is installed within the charging device 410, the liquid cooling device 420 may not require a separate pile-end cooling controller 423. Instead, the charging controller 414 of the charging device 410 can be used as the controller for the liquid cooling device 420. That is, the charging controller 414 can also be used to detect the voltage signal of the pile-end CC interface 4213 and determine the connection status between the pile-end inlet / outlet liquid port 421 and the electric vehicle 300 based on the voltage signal of the pile-end CC interface 4213.

[0215] The structure of the pile end liquid inlet / outlet 421 in the liquid cooling equipment 420 has been described above. The following is a further introduction to the liquid cooling system in the main body 422 of the liquid cooling equipment 420, which is connected to the pile end liquid inlet / outlet 421.

[0216] Figure 13 This is a schematic diagram of the structure of a device body 422 provided in an embodiment of this application.

[0217] See Figure 13 The main body 422 of the equipment 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, condenser 4221, first throttle valve 4228a, and first heat exchange channel 4223a are connected sequentially to form a first cooling circuit. The two ends of the second heat exchange channel 4223b are connected to the pile end liquid inlet port 4211 and the pile end liquid outlet port 4212, respectively, and form a second cooling circuit with the electric vehicle 300 through the pile end liquid inlet port 4211 and the pile end liquid outlet port 4212. The first cooling circuit exchanges heat with the first heat exchanger 4223 and the second cooling circuit to cool the second cooling circuit, which is used to cool the electric vehicle 300.

[0218] In practical implementation, when the liquid cooling device 420 is connected to the on-board charging connection device 310, the liquid cooling medium flowing in the second heat exchange channel 4223b of the first heat exchanger 4223 can be transferred to the on-board charging connection device 310 through the pile end liquid outlet port 4212, and then transferred to the thermal management system 330 through the on-board 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 cooling medium after heat exchange in the thermal management system 330 can be output through the on-board charging connection device 310, and further flow into the second heat exchange channel 4223b of the first heat exchanger 4223 through the pile end liquid inlet port 4211.

[0219] The liquid 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 it carries to the first cooling circuit, thereby cooling the liquid cooling medium in the second heat exchange channel 4223b. The cooled liquid cooling medium in the second heat exchange channel 4223b is then transferred to the on-board charging connection device 310 through the pile end liquid outlet port 4212, thus achieving a cooling cycle for the power battery 320 by the liquid cooling medium in the second heat exchange channel 4223b. Simultaneously, the cooling medium carrying heat in the first cooling circuit is cooled sequentially through the compressor 4222, condenser 4221, and first throttle valve 4228a to achieve a cooling cycle for the cooling medium in the first cooling circuit.

[0220] In this embodiment, 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. 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 port 4211 and the pile end liquid outlet port 4212. Through the above design, the first cooling circuit can cool the liquid phase cooling medium in the second cooling circuit through the first heat exchanger 4223, so as to realize the cooling cycle of the liquid phase cooling medium in the second cooling circuit on the electric vehicle 300. Thus, the power battery 320 is cooled while the charging device 410 is charging it, which is beneficial to meet the heat dissipation requirements of the power battery 320 during high-power charging and facilitates the realization of high-power charging of the electric vehicle 300 by the charging device 410.

[0221] Continue reading Figure 13 In some embodiments, the device body 422 further includes a radiator 4224, a first three-way valve 4225a, and a second three-way valve 4225b.

[0222] 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 through the first three-way valve 4225a, and the other end of the radiator 4224 is connected to the pile end liquid inlet port 4211 through the second three-way valve 4225b, forming a third cooling circuit with the electric vehicle 300. The liquid phase cooling medium in the third cooling circuit is used to cool the electric vehicle 300, and the radiator 4224 is used to provide air cooling for the liquid phase cooling medium in the third cooling circuit.

[0223] 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 liquid outlet port 4212 at the pile end, 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 port 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. 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 port 4211 and the first pile end liquid outlet port 4212.

[0224] 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 transferred to the thermal management system 330 through the on-board charging connection device 310; or, the liquid phase cooling medium in the second heat exchange channel 4223b of the first heat exchanger 4223 formed by 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 transferred to the thermal management system 330 through the on-board charging connection device 310, thereby cooling the power battery 320.

[0225] In one possible example, the right and upper valve ports of the first three-way valve 4225a and the right and upper valve ports of the second three-way valve 4225b can be opened, while the left valve port of the first three-way valve 4225a and the left valve port of the second three-way valve 4225b are closed.

[0226] In this configuration, the liquid cooling medium in the third cooling circuit containing the radiator 4224 can be transferred to the on-board charging connection device 310 via the pile-end liquid outlet 4212, and then to the thermal management system 330 via the on-board charging connection device 310. The thermal management system 330 then exchanges heat with the power battery 320, thereby cooling the power battery 320. The liquid cooling medium after heat exchange in the thermal management system 330 can be output through the on-board charging connection device 310 and further flow into the third cold zone circuit via the pile-end liquid inlet 4211, where it undergoes air cooling through the radiator 4224. The liquid cooling medium in the third cooling circuit after air cooling is again transferred to the on-board charging connection device 310 via the pile-end liquid outlet 4212, thus achieving a cooling cycle of the liquid cooling medium for the power battery 320.

[0227] In another possible example, the left and right valve ports of the first three-way valve 4225a and the left and right valve ports of the second three-way valve 4225b can be opened, while the upper valve port of the first three-way valve 4225a and the upper valve port of the second three-way valve 4225b are closed.

[0228] In this configuration, 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 transferred to the on-board charging connection device 310 through the pile-end liquid outlet 4212, so as to exchange heat with the power battery 320 through the thermal management system 330, thereby cooling the power battery 320. For a detailed description, please refer to the embodiments described above; further details will not be repeated here.

[0229] In this embodiment, 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 phase cooling medium in the third cooling circuit can be used to cool the electric vehicle 300. Furthermore, the liquid phase cooling medium in the third cooling circuit is naturally cooled by the radiator 4224, which helps to reduce the overall energy consumption of the liquid cooling equipment 420.

[0230] In some embodiments, continue reading Figure 6In order to drive the liquid cooling medium in the second and / or third cooling circuits to flow in the circuits, the main body 422 of the equipment 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 pile end liquid outlet port 4212; or, the water pump 42211 may be connected between the right valve port of the second three-way valve 4225b and the pile end liquid inlet port 4211.

[0231] It is understood that, in this embodiment of the application, the liquid cooling device 420 can also cool the charging device 410, for example, cool the multiple power conversion devices in the charging host 412, or cool the charging gun that is electrically connected to the charging host 412.

[0232] For example, continue reading Figure 14 In some embodiments, the device body 422 may also include a charging gun cooling circuit 4226, a second throttle valve 4228b, and a second heat exchanger 4227.

[0233] The charging device 410 may further include a charging gun. A liquid cooling medium flowing through the charging gun cooling circuit 4226 can exchange heat with the charging gun, thereby cooling it. The second heat exchanger 4227 includes a third heat exchange channel 4227a and a fourth heat exchange channel 4227b. The compressor 4222, condenser 4221, second throttle valve 4228a, and third heat exchange channel 4227a are connected sequentially to form the fourth cooling circuit. The fourth heat exchange channel 4227b is connected to the charging gun cooling circuit 4226, meaning that the liquid cooling medium in the charging gun cooling circuit 4226 can flow through the fourth heat exchange channel 4227b.

[0234] In specific implementation, when the liquid cooling medium that absorbs heat from 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 cooling medium carrying heat can exchange heat with the fourth cooling circuit through the third heat exchange channel 4227a of the second heat exchanger 4227 to transfer heat to the fourth cooling circuit, thereby cooling the liquid cooling medium in the charging gun cooling circuit, so as to realize the cooling cycle of the charging gun by the charging gun cooling circuit.

[0235] In this embodiment of the 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 phase 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.

[0236] In some embodiments, continue reading Figure 14The main body of the device 422 may also 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.

[0237] Figure 14 This is a schematic diagram of another device body 422 provided in the embodiments of this application.

[0238] It should be understood that Figure 14 The illustrated embodiments include Figure 13 To avoid redundancy, most of the technical features of the embodiments shown are described below, focusing primarily on the differences between the two.

[0239] and Figure 13 The difference between the illustrated embodiment and the one shown is that, in Figure 14 In the embodiment shown, the main body 422 may further include a four-way valve 4229 and a liquid storage tank 42210.

[0240] The compressor 4222's output is connected to one end of the condenser 4221 via a four-way valve 4229. The other end of the condenser 4221, the first throttle valve 4228a, and one end of the first heat exchange channel 4223a are sequentially connected. The other end of the first heat exchange channel 4223a is connected to the liquid receiver 42210 and the compressor 4222's input via the four-way valve 4229, forming a first cooling circuit. The compressor 4222's output is also connected to the other end of the first heat exchange channel 4223a via the four-way valve 4229. One end of the first heat exchange channel 4223a, the first throttle valve 4228a, and the other end of the condenser 4221 are sequentially connected. One end of the condenser 4221 is connected to the liquid receiver 42210 and the compressor 4222's input via the four-way valve 4229, forming a first heating circuit. This first heating circuit exchanges heat with the second cooling circuit via the first heat exchanger 4223 to heat the second cooling circuit.

[0241] Specifically, such as Figure 14As shown, the first valve port of the four-way valve 4229 (the lower valve port of the four-way valve 4229 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 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 shut-off valve 42214. The other end of the first heat exchange channel 4223a is connected to the third valve port (the upper valve port of the four-way valve 4229 shown in the figure) of the four-way valve 4229. The fourth valve port (the left valve port of the four-way valve 4229 shown in the figure) of the four-way valve 4229 is connected to the liquid storage tank 42210. 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 shut-off valve 42215.

[0242] In practical implementation, when the liquid cooling device 420 is connected to the on-board charging connection device 310 and the power battery 320 needs cooling, the lower valve port and left valve port of the four-way valve 4229 can be connected, and the upper valve port and right valve port of the four-way valve 4229 can be connected, thereby connecting 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, and 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 first cooling circuit mentioned above. 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 third cooling circuit mentioned above.

[0243] 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 and upper valve ports of the four-way valve 4229, as well as the left and right valve ports of the four-way valve 4229, can be connected. This allows 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 to be connected in sequence to form a first heating circuit. In this way, the cooling medium, after being heated and pressurized by the compressor 4222, can be transferred through the upper valve port of the four-way valve 4229 to the first heat exchange channel 4223a of the first heat exchanger 4223, and then exchange heat with the liquid cooling medium flowing in the second heat exchange channel 4223b to heat the liquid cooling medium. The heated liquid cooling medium is then transferred to the on-board charging connection device 310 to exchange heat with the power battery 320 through the thermal management system 330 to heat the power battery 320.

[0244] In this embodiment, the liquid cooling device 420 is also provided with a heating circulation pipeline, which enables the liquid cooling device 420 to heat the power battery 320, which is beneficial to meet the temperature requirements of the electric vehicle 300 in different scenarios.

[0245] In other embodiments, 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 and upper valve ports of the four-way valve 4229 can be connected, as well as the left and right valve ports of the four-way valve 4229. This allows 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 shut-off valve 42214, the condenser 4221, the left and right valve ports of the four-way valve 4229, the liquid storage tank 42210, and the input end of the compressor 4222 to be connected in sequence to form a second heating circuit. In this way, the cooling medium, after being heated and pressurized by the compressor 4222, can be transferred through the upper valve port of the four-way valve 4229 to the first heat exchange channel 4223a of the first heat exchanger 4223, and then exchange heat with the liquid cooling medium flowing in the second heat exchange channel 4223b to heat the liquid cooling medium. The heated liquid heating medium is then transferred to the on-board charging connection device 310 to exchange heat with the power battery 320 through the thermal management system 330 to heat the power battery 320. Furthermore, in the second heating circuit, the liquid heating medium can absorb heat from the charging gun cooling circuit 426 and the condenser 4221 to improve the heating efficiency of the power battery 320.

[0246] The above describes the specific composition of the vehicle-mounted charging connection device 310 and the charging pile 410 in the charging system 200 provided in this application embodiment. The following, with reference to the accompanying drawings, further explains how the vehicle-mounted charging connection device 310 and the charging pile 410 determine the connection status of the vehicle-end liquid inlet / outlet 312 (i.e., the first liquid inlet / outlet 312) and the pile-end liquid inlet / outlet 421 according to their respective CC interfaces.

[0247] Figure 15 and Figure 16 These are specific circuit diagrams showing how an on-board charging connection device 310 and a charging pile 410, provided in this application embodiment, determine the connection status of the vehicle-side liquid inlet / outlet 312 (i.e., the first liquid inlet / outlet 312) and the pile-side liquid inlet / outlet 421 respectively based on their respective CC interfaces.

[0248] Combination Figure 2 , Figure 15 and Figure 16 For the liquid cooling device 420 being located outside the charging device 410, and the liquid cooling device 420 being connected to the on-board charging connection device 310 solely via a liquid cooling gun, Figure 15 and Figure 16 The liquid cooling interface includes Figure 2 The liquid cooling plug includes a liquid inlet / outlet 421 at the pile end and a liquid inlet / outlet 312 at the vehicle end. The liquid cooling plug may include the liquid inlet / outlet 421 at the pile end, and the liquid cooling socket may include the liquid inlet / outlet 312 at the vehicle end.

[0249] Specifically, combined Figure 4 , Figure 15 and Figure 16 The liquid cooling socket includes a first liquid inlet port 3121, a first liquid outlet port 3122, and a vehicle-end cooling CC port 3123, combined with Figure 12 The liquid cooling plug includes a liquid inlet port 4211, a liquid outlet port 4212, and a cooling CC port 4213.

[0250] 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 determines the connection status of the liquid cooling plug and the liquid cooling socket by judging the voltage signal of the pile-end cooling CC interface 4213 through the pile-end cooling CC circuit. The vehicle-side charging connection device 310 includes a vehicle-side cooling CC circuit, which is electrically connected to a vehicle-side charging connection controller 315 and a vehicle-side cooling CC interface 3123, respectively. The vehicle-side charging connection controller 315 determines the connection status of the liquid cooling plug and the liquid cooling socket by judging the voltage signal of the vehicle-side cooling CC interface 3123 through the vehicle-side cooling CC circuit.

[0251] Specifically, such as Figure 15 As shown, 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 through 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.

[0252] Before the liquid-cooled socket is connected to the liquid-cooled plug, the voltage at detection point 2 should be the output voltage of vehicle-end voltage source U2, since detection point 2 is connected to vehicle-end voltage source U2. Only when the liquid-cooled socket is connected to the liquid-cooled plug does the vehicle-end voltage source U2 form a circuit through the first vehicle-end resistor unit R5, the first terminal resistor unit R3, and the grounding wire in the liquid-cooling equipment. Due to the voltage division function of the resistors, the voltage at detection point 2 will reach the first vehicle-end preset value.

[0253] For example, if the voltage output of the vehicle-side voltage source U2 is set to 12V, and the resistance values ​​of R3 and R5 are equal, then the first vehicle-side preset value is 6V. Under this design, if the voltage at detection point 2 is 6V, the on-board charging connection device recognizes that the liquid-cooled socket and liquid-cooled plug are in a connected state.

[0254] For example, the voltage output of the vehicle-side voltage source U2 is still set to 12V, but the resistance values ​​of R3 and R5 are different, such as R3 being 2Ω and R5 being 4Ω, then the first vehicle-side preset value is 4V. Under this design, if the voltage at detection point 2 is 4V, the vehicle-mounted charging connection device recognizes that the liquid-cooled socket and liquid-cooled plug are in a connected state.

[0255] Therefore, based on the above analysis, when the voltage at detection point 2 is the output voltage of 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 preset value at the vehicle end, the on-board charging connection device can identify that the liquid-cooled socket is connected to the liquid-cooled plug.

[0256] In this embodiment, since the first vehicle-end cooling CC interface is electrically connected to the vehicle-end voltage source in the on-board charging connection device 310, when the voltage value of the first vehicle-end cooling CC interface is the same as the voltage value of the vehicle-end voltage source, it indicates that the charging pile inlet / outlet 421 and the vehicle-end inlet / 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 on-board charging connection device 310 can identify that the charging pile inlet / outlet 421 and the vehicle-end inlet / outlet 312 are connected. Identifying the connection status of the charging pile inlet / outlet 421 and the vehicle-end inlet / outlet 312 by the voltage value of the first vehicle-end cooling CC interface can improve the accuracy of the on-board charging connection device 310 in identifying the connection status of the charging pile inlet / outlet 421 and the vehicle-end inlet / outlet 312, thereby meeting the heat dissipation requirements of the power battery 320 during high-power charging and facilitating the high-power charging of the electric vehicle 300 by the charging equipment 410.

[0257] In some embodiments, such as Figure 16 As shown, the pile-end cooling CC circuit also 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 also includes a second pile-end cooling CC interface, which corresponds to the plug of the CC1 interface shown in the figure. The second pile-end cooling CC interface is electrically connected to the pile-end voltage source U1 through the second pile-end resistor unit R1. The vehicle-end cooling CC circuit also includes a second vehicle-end cooling CC circuit, which includes a second vehicle-end resistor unit R4. The vehicle-end cooling CC interface 3123 also includes a second vehicle-end cooling CC interface, which is grounded through 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.

[0258] 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 to the liquid-cooled plug will the terminal voltage source U1 form a circuit through the second terminal resistor unit R1, the second vehicle-end resistor unit R4, and the grounding wire in the on-board charging connection device. Due to the voltage division function of the resistors, the voltage at detection point 3 will reach the preset value of the second vehicle end.

[0259] For example, if the voltage output of the charging pile voltage source U1 is set to 12V, and the resistance values ​​of R1 and R4 are equal, then the preset value at the second vehicle end is 6V. Under this design, if the voltage at detection point 3 is 6V, the on-board charging connection device recognizes that the liquid-cooled socket and liquid-cooled plug are in a connected state.

[0260] For example, the voltage output of the charging pile voltage source U1 is still set to 12V, but the resistance values ​​of R1 and R4 are different, such as R1 being 2Ω and R4 being 4Ω, then the preset value at the second vehicle end is 8V. Under this design, if the voltage at detection point 3 is 8V, the on-board charging connection device recognizes that the liquid-cooled socket and liquid-cooled plug are in a connected state.

[0261] Therefore, based on the above analysis, when the voltage at detection point 2 is the output voltage of 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 liquid-cooled plug are successfully connected.

[0262] Similarly, 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, the voltage at detection point 1 should be the output voltage of the pile-end voltage source U1. Only when the liquid-cooled socket is connected to the liquid-cooled plug does the current in the pile-end voltage source U1 form a loop with the second pile-end resistor unit R1, the second vehicle-end resistor unit R4, and the grounding wire in the on-board charging connection device. Because detection point 1 is located between the second pile-end resistor unit R1 and the second vehicle-end resistor unit R4, the voltage at detection point 1 will reach the first pile-end preset value due to the voltage division function of the resistors.

[0263] For example, if the voltage output of the terminal voltage source U1 is set to 12V, and the resistance values ​​of R1 and R4 are equal, then the preset value of the first terminal is 6V. Under 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 in a connected state.

[0264] For example, the voltage output of the terminal voltage source U1 is still set to 12V, but the resistance values ​​of R1 and R4 are not equal, such as R1 being 2Ω and R4 being 4Ω. Then the preset value of the first terminal is 8V. Under 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 in a connected state.

[0265] 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-cooled socket is not connected to the liquid-cooled plug. When the voltage at detection point 1 is the preset value of the first pile end, the liquid cooling device can identify that the liquid-cooled socket and the liquid-cooled plug are successfully connected.

[0266] In this embodiment, since the second terminal cooling CC circuit is electrically connected to the terminal voltage source in the charging pile, when the voltage value of the second terminal cooling CC interface is the output voltage value of the terminal voltage source, it indicates that the terminal inlet / outlet 421 and the vehicle inlet / outlet 312 are not connected. When the voltage value of the second terminal cooling CC interface reaches the first terminal preset value, the liquid cooling device 420 can identify that the terminal inlet / outlet 421 and the vehicle inlet / outlet 312 are connected. Identifying the connection status of the terminal inlet / outlet 421 and the vehicle inlet / outlet 312 by the voltage value of the second terminal cooling CC interface can improve the accuracy of the liquid cooling device 420 in identifying the connection status of the terminal inlet / outlet 421 and the vehicle inlet / outlet 312, thereby meeting the heat dissipation requirements of the power battery 320 during high-power charging and facilitating the high-power charging of the electric vehicle 300 by the charging device 410.

[0267] In some embodiments, continue reading Figure 16 The second pile end cooling CC circuit also includes a normally closed switch S. The second pile end cooling CC interface is electrically connected to the second pile end resistor unit R1 through the normally closed switch S. The detection between the second pile end resistor unit R1 and the normally closed switch S is detection point 1.

[0268] 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 normally closed, the voltages at detection points 1 and 4 should both be the output voltage of the pile-end voltage source U1. Only when the liquid-cooled socket is connected to the liquid-cooled plug does the current of the 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 grounding 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 reach the first preset value due to the voltage division function of the resistors. Another possible scenario is that the liquid-cooled socket is connected to the liquid-cooled plug, but switch S is in the open state. In this case, detection point 1 is connected to the pile-end voltage source U1, and detection point 4 is connected to the grounding wire in the on-board charging connection device 310, resulting in the voltage at detection point 1 being the output voltage of the pile-end voltage source U1, and the voltage at detection point 4 being 0V.

[0269] For example, if the voltage output of voltage source U1 is set to 12V, and the resistances of R1 and R4 are equal, then the preset value of the first terminal is 6V. Under this design, if the voltage at detection point 1 is 6V, the liquid cooling device recognizes a successful connection between the liquid cooling socket and the liquid cooling plug. If the voltage at detection point 1 is 12V, and the voltage at detection point 4 is 0V, it indicates that the liquid cooling socket and the liquid cooling plug are connected, but switch S is open.

[0270] For example, if the voltage output of voltage source U1 is still set to 12V, but the resistance values ​​of R1 and R4 are different (e.g., R1 is 2Ω and R4 is 4Ω), then the preset value at the terminals 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. If the voltage at detection point 1 is 12V and the voltage at detection point 4 is 0V, it indicates that the liquid cooling socket and liquid cooling plug are connected, but switch S is open.

[0271] Based on the above analysis, when the voltage at detection points 1 and 4 is the output voltage of 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 preset value of the first terminal, the liquid cooling device can identify that the liquid cooling socket and liquid cooling plug are successfully connected. When the voltage at detection point 1 is the output voltage of voltage source U1 and the voltage at detection point 4 is 0V, the liquid cooling device identifies that the liquid cooling socket and liquid cooling plug are connected, but switch S is in the open state.

[0272] In this embodiment, the liquid cooling device 420 can identify the connection status of the pile end liquid inlet / outlet 421 and the vehicle end liquid inlet / outlet 312 based on the voltage value of the second pile end cooling CC interface and further combine 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 / outlet 421 and the vehicle end liquid inlet / outlet 312.

[0273] The above text describes how to determine the connection status of the liquid-cooled plug and liquid-cooled socket through the vehicle-mounted charging connection device 310 and the liquid-cooling device 420. For determining the connection status of the charging socket and charging plug corresponding to the charging output interface 411 at the charging pile end and the charging input interface 311 at the vehicle end, relevant standards can be referenced, including 2015, 2015+, and Supercharger.

[0274] The following describes a charging method that can be applied to a charging system 200, provided by an embodiment of this application.

[0275] Figure 17 This is a schematic flowchart of a charging method 500 provided in an embodiment of this 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. The on-board charging connection device 310 is applied to an electric vehicle 300.

[0276] It should be understood that the description of the method embodiments corresponds to the description of the above structural embodiments. Therefore, for any content not described in detail, please refer to the above device embodiments, which will not be repeated hereafter.

[0277] See Figure 17 The charging method 500 may include:

[0278] S501 and S501', the on-board charging connection device 310 and the charging pile 400 can each determine the connection status between the electric vehicle 300 and the charging equipment 410 in the charging pile 400.

[0279] For example, combined Figure 4 and Figure 12 The vehicle-side charging input interface 311 in the vehicle-side charging connection device 310 can be a charging socket, and the charging output interface 411 in the charging device 410 can be a charging plug. When the vehicle-side charging connection device 310 and the charging pile 400 detect that the charging socket and the charging plug are plugged in, the vehicle-side 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 charging CC interface 4112 in the charging output interface 411. Based on the detected voltage signals, the connection status of the vehicle-side charging input interface 311 and the charging output interface 411 is determined, that is, the connection status of the electric vehicle 300 and the charging device 410 is determined.

[0280] S502 and S502': When the on-board charging connection device 310 and the charging pile 400 respectively determine that the electric vehicle 300 and the charging equipment 410 are connected, the on-board charging connection device 310 and the charging pile 400 can respectively determine the connection status between the electric vehicle 300 and the liquid cooling device 420 in the charging pile 400.

[0281] For example, combined Figure 4 and Figure 12 The liquid cooling device 420's terminal inlet / outlet 421 can be a liquid cooling plug, and the on-board charging connection device 310's first inlet / outlet 312 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 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 inlet / outlet 312, and the charging pile 400 can detect the voltage signal of the terminal cooling CC interface 4213 in the terminal inlet / outlet 421. Based on the detected voltage signals, the connection status of the first inlet / outlet 312 and the terminal inlet / outlet 421 is determined, that is, the connection status of the electric vehicle 300 and the liquid cooling device 420 is determined.

[0282] It is understandable that the above order of determining the connection status is only illustrative. 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. Alternatively, 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, as well as the connection status between the electric vehicle 300 and the charging device 410.

[0283] S503, based on the fact that the electric vehicle 300 and the charging equipment 410 are connected, and the electric vehicle 300 and the liquid cooling equipment 420 are connected, the on-board charging connection device 310 can send an overcharge request message to the charging pile 400. The overcharge request message is used to instruct the charging equipment 410 to charge the electric vehicle 300 at a first output power, where the first output power is greater than or equal to a preset power.

[0284] Specifically, combined Figure 4 In some embodiments, 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, the on-board charging connection device 310 can receive a charging request message sent by the vehicle controller 341 of the electric vehicle 300. The charging request message indicates the charging power required for charging 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.

[0285] It is understood that the charging request message can be sent from the battery management system 342 of the electric vehicle 300 to the vehicle controller 341, and then from the vehicle controller 341 to the on-board charging connection device 310. Alternatively, in some embodiments, 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 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.

[0286] It is also understood that, in the embodiments of this application, when the charging power required for charging the power battery 320 in the electric vehicle 300, i.e., the first output power, is greater than or equal to the preset power, it can refer to overcharging the electric vehicle 300; when the charging power required for charging the power battery 320 in the electric vehicle 300, i.e., the first output power, is less than the preset power, it can refer to fast charging the electric vehicle 300. The preset power can be, for example, 250 kW.

[0287] Correspondingly, after receiving the overcharging request message, the charging pile 400 can control the charging equipment 410 to charge the electric vehicle 300 at the first output power.

[0288] In this embodiment, when the charging power required for the power battery 320 in the electric vehicle 300 is high, for example, when the required power is an overcharge power greater than the preset power, the on-board charging connection device 310, when both the electric vehicle 300 and the charging device 410 and liquid cooling device 420 in the charging pile 400 are connected, sends the power required by the power battery 320 to the charging pile 400. This allows the charging device 410 to perform high-power charging on the power battery 320 while simultaneously using the liquid cooling device 420 to transfer liquid cooling medium to the electric vehicle 300, thereby meeting the heat dissipation requirements of the power battery 320 during high-power charging and facilitating the realization of high-power charging of the electric vehicle 300 by the charging device 410.

[0289] It is understandable that in the above charging method 500, combined with Figure 12 The specific steps on the charging pile 400 side can be executed by the pile-end controller in the charging pile 400. The pile-end controller may 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 may be integrated into the pile-end charging controller 414. Figure 4 The specific steps on the vehicle charging connection device 310 side can be executed by the vehicle charging connection controller 315 in the vehicle charging connection device 310.

[0290] The following is combined Figure 20 The charging method 500 provided in the embodiments of this application will be described in further detail.

[0291] Figure 18 This is a schematic flowchart of another charging method 500 provided in an embodiment of this application. The charging method 500 can be applied to the charging system 200 described above.

[0292] See Figure 18 The charging method 500 may include:

[0293] S501 and S501', the on-board charging connection device 310 and the charging pile 400 can each determine the connection status between the electric vehicle 300 and the charging equipment 410 in the charging pile 400.

[0294] S502 and S502': When the on-board charging connection device 310 and the charging pile 400 respectively determine that the electric vehicle 300 and the charging equipment 410 are connected, the on-board charging connection device 310 and the charging pile 400 can respectively determine the connection status between the electric vehicle 300 and the liquid cooling device 420 in the charging pile 400.

[0295] For detailed descriptions of S501, S501', S502, and S502', please refer to [link / reference needed]. Figure 19The embodiments shown are not described in detail here.

[0296] In one possible scenario, in S502 and S502', if the on-board charging connection device 310 and the charging pile 400 each determine that the electric vehicle 300 is not connected to the liquid cooling device 420, then the on-board charging connection device 310 executes S503.

[0297] S503, based on the fact that the electric vehicle 300 and the charging equipment 410 are connected, but the electric vehicle 300 and the liquid cooling equipment 420 are not connected, the on-board charging connection device 310 can send a first connection status indication message to the vehicle controller 341 of the electric vehicle 300.

[0298] The first connection status indication message is used to indicate that the electric vehicle 300 and the charging equipment 410 are connected, and the on-board charging connection device 310 determines that the electric vehicle 300 and the liquid cooling equipment 420 are not connected.

[0299] S504, the vehicle controller 341 sends a charging request message to the on-board charging connection device 310 based on the received first connection status indication message.

[0300] The charging request message indicates the charging power required for charging 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. The first output power is greater than or equal to a preset power.

[0301] S505, after receiving a charging request message, the on-board charging connection device 310 sends a fast charging request message to the charging pile 400 since the liquid cooling device 420 is not connected to the electric vehicle 300. The fast charging request message instructs the charging device 410 to charge the electric vehicle 300 at an output power lower than a preset power.

[0302] Correspondingly, after receiving a fast charging request message, the charging pile 400 can control the charging equipment 410 to charge the electric vehicle 300 at an output power lower than the preset power.

[0303] In this embodiment, when the charging power required for the power battery 320 in the electric vehicle 300 is high, such as when the required power is an overcharge power greater than a preset power, if the liquid cooling device 420 in the electric vehicle 300 and 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 the preset power. This can avoid the problem of the power battery 320 overheating due to the charging power of the charging device 410 being too high, and helps to ensure that the charging device 410 charges the power battery 320 normally through the on-board charging connection device 310.

[0304] In another possible scenario, in S502 and S502', if the on-board charging connection device 310 and the charging pile 400 each determine that the electric vehicle 300 is connected to the liquid cooling device 420, then the on-board charging connection device 310 executes S506.

[0305] S506, based on the fact that the electric vehicle 300 and the charging equipment 410 are connected, and the electric vehicle 300 and the liquid cooling equipment 420 are connected, the on-board charging connection device 310 can 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 equipment 410 are connected, and the on-board charging connection device 310 determines that the electric vehicle 300 and the liquid cooling equipment 420 are connected.

[0306] S507, the vehicle controller 341 sends a charging request message and a temperature request message to the on-board charging connection device 310 based on the received second connection status indication message.

[0307] The charging request message instructs the charging device 410 to charge the power battery 320 of the electric vehicle 300 at a first output power greater than or equal to a preset power. The temperature request message instructs the electric vehicle 300 to provide temperature requirements, such as the flow rate and temperature of the liquid cooling medium required for cooling the power battery 320 when charging at the first output power.

[0308] S508, the on-board charging connection device 310 receives an authentication message sent by the charging pile 400. The authentication message is used to indicate whether the charging device 410 has the function of output power greater than or equal to the preset power. That is to say, the authentication message is used to indicate whether the charging device has the function of overcharging the power battery 320.

[0309] S509, the on-board charging connection device 310 determines whether the charging device 410 has the function of output power greater than the preset power based on the received authentication message. If not, S510 is executed.

[0310] 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 according to the authentication message indicating that the charging device 410 does not have the function of output power greater than or equal to the preset power, that is, the charging device does not have the function of overcharging the power battery 320.

[0311] Correspondingly, after receiving the fast charging request message and the temperature request message, the charging pile 400 can control the charging equipment 410 to charge the power battery 320 at an output power lower than the preset power, and control the liquid cooling equipment 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.

[0312] In this embodiment, when the charging power required for the power battery 320 in the electric vehicle 300 is high, such as when the required power is an overcharge power greater than a preset power, if the charging equipment 410 in the charging pile 400 does not have an overcharge function, 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 the preset power, so that the charging equipment 410 can charge the power battery 320. Furthermore, the liquid cooling device 420 can also transfer a liquid cooling medium to the electric vehicle 300 according to the instructions of the on-board charging connection device 310, which is beneficial to improving the cooling performance of the power battery 320 during fast charging.

[0313] 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 output power greater than a preset power, the on-board charging connection device 310 may, after receiving the charging request message and temperature request message sent by the vehicle controller 341, directly send an overcharge request message and a temperature request message to the charging pile 400 simultaneously. The overcharge request message is used to instruct the charging device 410 to charge the electric vehicle 300 at a first output power.

[0314] Correspondingly, after receiving the overcharge request message and the temperature request message, the charging pile 400 can control the charging equipment 410 to charge the power battery 320 with the first output power, and control the liquid cooling equipment 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.

[0315] In this embodiment, when the charging power required for the power battery 320 in the electric vehicle 300 is high, for example, when the required power is an overcharge power greater than a preset power, if the charging equipment 410 in the charging pile 400 has an overcharge function, the on-board charging connection device 310 can send the power required by the power battery to the charging pile 400, enabling the charging equipment 410 to charge the power battery 320 at high power. Furthermore, 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, to meet the heat dissipation requirements of the power battery 320 during high-power charging, thus facilitating the high-power charging of the electric vehicle 300 by the charging equipment 410.

[0316] 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 output power greater than the preset power, the on-board charging connection device 310 can, after receiving the charging request message and temperature request message sent by the vehicle controller 341, first send the temperature request message to the charging pile 400, and then send the overcharge request message to the charging pile 400, that is, execute S511~S513.

[0317] 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 according to the authentication message indicating that the charging device 410 has the function of output power greater than or equal to the preset power, that is, the charging device does not have the function of overcharging the power battery 320.

[0318] 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, so as to cool the power battery 320.

[0319] S512, the on-board charging connection device 310 can monitor the liquid cooling medium transmitted by the liquid cooling device 420 and determine whether the transmitted liquid cooling medium meets the temperature request information of the electric vehicle 300 indicated by the temperature request message. If so, S513 is executed.

[0320] For example, in specific implementation, combined with Figure 4 The on-board charging connection device 310 can monitor the temperature of the liquid 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, so as to determine whether the transmitted liquid cooling medium meets the temperature request information of the electric vehicle 300.

[0321] S513, based on the information transmitted by the liquid cooling device 420 that the liquid phase cooling medium meets the temperature requirements of the electric vehicle 300, the on-board charging connection device 310 sends an overcharge request message to the charging pile 400.

[0322] Correspondingly, after receiving the supercharging request message, the charging pile 400 can control the charging equipment 410 to charge the power battery 320 at the first output power.

[0323] In this embodiment, when the charging power required for the power battery 320 in the electric vehicle 300 is high, such as when the required power is an overcharge 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. This causes the liquid cooling device 420 in the charging pile 400 to first transmit a liquid cooling medium to the electric vehicle 300. After the transmitted liquid cooling medium meets the temperature requirements of the electric vehicle 300, the device then sends an overcharge request message to the charging pile 400, enabling the charging equipment to perform high-power charging on the power battery 320. This helps to further ensure that the liquid cooling medium transmitted by the liquid cooling device 420 meets the heat dissipation requirements of the power battery 320 during high-power charging, and facilitates the realization of high-power charging of the electric vehicle 300 by the charging equipment 410.

[0324] In some embodiments, the charging method 500 may further include: 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 connected, the on-board charging connection device 310 can control the power transmission circuit between the electric vehicle 300 and the charging device 410 to be connected, and monitor the temperature of the power transmission circuit.

[0325] For example, in specific implementation, combined with Figure 4 The on-board charging connection device 310 can control the charging circuit relay 351 in the high-voltage distribution unit 350 to close, based on the connection between the electric vehicle 300 and the charging equipment 410, and the connection between the electric vehicle 300 and the liquid cooling equipment 420, so as to connect the power transmission circuit between the electric vehicle 300 and the charging equipment 410. Furthermore, the on-board charging connection device 310 can monitor the temperature on the power transmission circuit electrically connected to the vehicle-end DC interface 3111 via the temperature sensor 316 of the vehicle-end DC interface.

[0326] In some embodiments, the charging method 500 may further include the following: 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 on-board charging connection device 310 sends a power limiting request message to the charging pile 400, the power limiting request message being used to instruct the charging device 410 to reduce the output power.

[0327] Correspondingly, after receiving the power limiting request message sent by the on-board charging connection device 310, the charging pile 400 controls the charging equipment 410 to reduce the output power.

[0328] In this embodiment, the on-board charging connection device 310 can monitor the temperature on the power transmission circuit in real time and instruct the charging device 410 to reduce the output power when the temperature is abnormal. This helps to further meet the temperature requirements of the power battery 320 during charging and ensures that the charging device 410 charges the power battery 320 normally.

[0329] Figure 19 This is a schematic flowchart of a charging method 600 provided in an embodiment of this application. The charging method 600 can be executed by the aforementioned on-board charging connection device 310, specifically by the on-board charging connection controller 315 within the on-board charging connection device 310.

[0330] See Figure 19 The charging method 600 may include:

[0331] S610, determine the connection status of the electric vehicle 300 with the charging equipment and the connection status of the electric vehicle 300 with the external liquid cooling equipment. For example, determine the connection status of the electric vehicle 300 with the charging equipment 410 and the liquid cooling equipment 420 in the charging pile 400.

[0332] For example, combined Figure 4 and Figure 12 The vehicle-side charging input interface 311 and the first liquid inlet / outlet 312 in the vehicle-side charging connection device 310 can be, for example, a charging socket and a liquid cooling socket, respectively. When the vehicle-side 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 / outlet 312, and determine the connection status of the electric vehicle 300 with the charging device 410 and the liquid cooling device 420 in the charging pile 400 based on the detected voltage signals.

[0333] S620 sends a supercharging request message to the charging equipment based on the fact that the electric vehicle 300 is connected to the charging equipment and that the electric vehicle 300 is connected to the external liquid cooling equipment.

[0334] The supercharge request message is used to instruct the charging device to charge the electric vehicle at a first output power, which is greater than or equal to a preset power.

[0335] For details regarding the charging method, please refer to the relevant description of charging method 500 above, which will not be repeated here.

[0336] In this embodiment, when the charging power required for the power battery 320 in the electric vehicle 300 is high, for example, when the required power is an overcharge power greater than the 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 is connected to the charging device and the external liquid cooling device. This allows the charging device to perform high-power charging on the power battery 320 while simultaneously using the external liquid cooling device to transfer liquid cooling medium to the electric vehicle 300, thereby meeting the heat dissipation requirements of the power battery 320 during high-power charging and facilitating the realization of high-power charging of the electric vehicle 300 by the charging device.

[0337] Figure 20 This is a schematic flowchart of a charging method 700 provided in an embodiment of this application. The charging method 700 can be executed by the charging pile 400, specifically by the 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.

[0338] See Figure 20 The charging method 700 may include:

[0339] S710, based on the fact that the electric vehicle 300 is connected to the charging device 410 in the charging pile 400 and that the electric vehicle 300 is connected to the liquid cooling device 420 in the charging pile 400, an overcharge request message is sent to the charging pile 400. The overcharge 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.

[0340] For example, combined Figure 4 and Figure 12 The charging output interface 411 in the charging device 410 can be a charging plug, and the liquid inlet / outlet 421 in the liquid cooling device 420 can be a liquid cooling plug. When the charging 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 detect the voltage signal of the charging CC interface 4112 in the charging output interface 411 and the voltage signal of the cooling CC interface 4213 in the liquid inlet / outlet 421, and determine that the charging device 410 and the liquid cooling device 420 are connected to the electric vehicle 300 based on the detected voltage signals.

[0341] S720 controls the charging device 410 to charge the electric vehicle 300 at a first output power.

[0342] For details regarding the charging method, please refer to the relevant description of charging method 500 above, which will not be repeated here.

[0343] In this embodiment, when the charging power required for the power battery 320 in the electric vehicle 300 is high, for example, when the required power is an overcharge power greater than the preset power, the charging pile 400 can, with both the charging device 410 and the liquid cooling device 420 connected to the electric vehicle 300, simultaneously charge the power battery 320 at high power while the connected liquid cooling device 420 can transfer liquid cooling medium to the electric vehicle 300 to meet the heat dissipation requirements of the power battery 320 during high-power charging, thus facilitating the realization of high-power charging of the electric vehicle 300 by the charging device 410.

[0344] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An electric vehicle, characterized in that, The electric vehicle includes at least one vehicle-side charging input interface, a first liquid inlet / outlet, a power battery, and a power battery thermal management system. Each of the at least one vehicle-side charging input interface is used to connect to a charging device to transmit electrical energy output by the charging device to the power battery. The first liquid inlet / outlet is used to connect to an external liquid cooling device to transfer the cooling medium output by the external liquid cooling device to the thermal management system of the power battery. The electric vehicle is used for: If each vehicle-side charging input interface is successfully connected to the charging device, and the first liquid inlet / outlet is successfully connected to the external liquid cooling device: Sending a supercharge request message and a temperature request message, wherein the supercharge request message is used to instruct the charging device to output DC power to the electric vehicle at a first output power, the first output power being greater than or equal to a preset power, and the temperature request message is used to instruct the electric vehicle on temperature requirements, the temperature requirements including the flow rate and temperature of the liquid cooling medium required for the power battery to be cooled when charging at the first output power.

2. The electric vehicle according to claim 1, characterized in that, Each of the vehicle-side charging input interfaces includes a vehicle-side DC interface and a vehicle-side charging connection confirmation (CC) interface; the first liquid inlet / outlet includes a first liquid inlet interface, a first liquid outlet interface, and a vehicle-side cooling (CC) interface; wherein... The vehicle-side DC interface is used to transmit the DC power output by the charging device to the power battery; The voltage signal of the vehicle-side charging connection confirmation CC interface is used to indicate the connection status between the vehicle-side DC interface and the charging device. The first liquid inlet and the first liquid outlet are connected to the thermal management system of the power battery. The first liquid inlet is used to transfer the cooling medium output by the external liquid cooling device to the thermal management system of the power battery. The first liquid outlet is used to output the cooling medium after cooling the power battery to the external liquid cooling device. The voltage signal of the vehicle-side cooling CC interface is used to indicate the connection status between the first liquid inlet / outlet and the external liquid cooling device.

3. The electric vehicle according to claim 2, characterized in that, The electric vehicle also includes a first vehicle-end cooling CC circuit, which includes a first vehicle-end resistor unit and a vehicle-end voltage source. The vehicle-end cooling CC interface includes a first vehicle-end cooling CC interface, which is connected to the vehicle-end voltage source through the first vehicle-end resistor unit. The voltage signal of the vehicle-end cooling CC interface includes the voltage signal of the detection point between the first vehicle-end resistor unit and the first vehicle-end cooling CC interface.

4. The electric vehicle according to claim 3, characterized in that, The electric vehicle is used for: When the voltage at the detection point between the first vehicle-side resistor unit and the first vehicle-side cooling CC interface reaches a first preset value, it is confirmed that the first liquid inlet / outlet is successfully connected to the external liquid cooling device.

5. The electric vehicle according to claim 3, characterized in that, The electric vehicle also includes a second vehicle-end cooling CC circuit, which includes a second vehicle-end resistor unit. The vehicle-end cooling CC interface also includes a second vehicle-end cooling CC interface, which is grounded through the second vehicle-end resistor unit; The voltage signal of the vehicle-end cooling CC interface also includes the voltage signal of the detection point between the second vehicle-end resistor unit and the second vehicle-end cooling CC interface; The electric vehicle is used for: When the voltage at the detection point between the first vehicle-end resistor unit and the first vehicle-end cooling CC interface reaches a first preset value, and the voltage at the detection point between the second vehicle-end resistor unit and the second vehicle-end cooling CC interface reaches a second preset value, it is confirmed that the first liquid inlet / outlet is successfully connected to the external liquid cooling device.

6. The electric vehicle according to any one of claims 2 to 5, characterized in that, The electric vehicle also includes an inlet pipe, a heat exchange structure, and an outlet pipe; wherein... The liquid inlet pipeline is used to transmit the cooling medium received from the external liquid cooling device by the first liquid inlet interface to the thermal management system of the power battery. The heat exchange structure is connected to the liquid inlet pipeline, and the heat exchange structure is used to exchange heat with the vehicle-end DC interface and the power transmission cable electrically connected to the vehicle-end DC interface; The liquid outlet pipeline is used to output the cooling medium after cooling the power battery to the first liquid outlet port.

7. The electric vehicle according to claim 6, characterized in that, The electric vehicle also includes a heated liquid inlet pipe; The heating inlet pipeline is used to transmit the liquid phase heating medium received from the external liquid cooling device at the first inlet interface to the thermal management system of the power battery.

8. The electric vehicle according to any one of claims 1 to 7, characterized in that, The electric vehicle also includes a charging circuit contactor; The charging circuit contactor is connected between the vehicle-side DC interface of each vehicle-side charging input interface and the power battery. The charging circuit contactor is used to disconnect or connect the power transmission circuit between the vehicle-end DC interface and the power battery connected to the charging circuit contactor.

9. The electric vehicle according to claim 8, characterized in that, The electric vehicle also includes a fuse, which is connected in series with the charging circuit contactor between the vehicle-side DC interface of each vehicle-side charging input interface and the power battery. The fuse is used to disconnect the power transmission circuit between the vehicle-end DC interface and the power battery when the current transmitted to the fuse is greater than a preset current.

10. The electric vehicle according to any one of claims 1 to 9, characterized in that, The electric vehicle also includes a temperature sensor for the DC interface at the vehicle end and a temperature sensor for the first liquid inlet / outlet. The temperature sensor of the vehicle-end DC interface is used to detect at least one of the following temperatures: the temperature of the vehicle-end DC interface, and the temperature of the power transmission cable electrically connected to the vehicle-end DC interface; The temperature sensor at the first inlet / outlet is used to detect the temperature of the first inlet / outlet.

11. The electric vehicle according to claim 10, characterized in that, The electric vehicle is also used for: If the temperature detected by the temperature sensor at the vehicle-side DC interface is higher than a preset temperature, a power limit request message is sent to the charging device. The power limit request message is used to instruct the charging device to reduce the output power.

12. The electric vehicle according to any one of claims 2 to 11, characterized in that, The electric vehicle is also used for: If the vehicle-side charging input interface and the charging device are successfully connected, but the first liquid inlet / outlet and the liquid cooling device are not successfully connected, a message is sent to the charging device instructing it to output a second power; wherein, The first output power is greater than the second power.

13. A charging pile, characterized in that, The charging pile includes charging equipment and liquid cooling equipment. The charging equipment includes multiple power conversion devices and a charging output interface at the pile end. The liquid cooling equipment includes a liquid inlet interface and a liquid outlet interface at the pile end. The plurality of power conversion devices are used to convert AC power into DC power and then deliver it to the charging output interface at the charging pile end. The charging output interface at the charging pile end is used to electrically connect to the electric vehicle so as to output the DC power to the electric vehicle. The liquid outlet port at the pile end is used to transfer the cooling medium in the liquid cooling equipment to the electric vehicle, and the liquid inlet port at the pile end is used to receive the cooling medium output by the electric vehicle. The charging pile is used for: If the charging output interface at the pile tip and the electric vehicle are successfully connected, and the liquid inlet interface at the pile tip and the liquid outlet interface at the pile tip are successfully connected to the electric vehicle: The device receives a supercharging request message and a temperature request message sent by the electric vehicle. The supercharging request message is used to instruct the charging device to output DC power to the electric vehicle at a first output power, which is greater than or equal to a preset power. The temperature request message is used to instruct the electric vehicle to provide temperature requirement information, which includes the flow rate and temperature of the liquid cooling medium required for the electric vehicle's power battery to be cooled when it is charged at the first output power. The system controls the multiple power conversion devices to output the first output power through the charging output interface at the pile end to charge the electric vehicle, and controls the liquid cooling equipment to output the cooling medium to the electric vehicle through the liquid outlet interface at the pile end according to the temperature requirement information of the electric vehicle indicated by the temperature request message.

14. The charging pile according to claim 13, characterized in that, The charging pile also includes a second pile end cooling connection confirmation CC interface and a second pile end cooling CC circuit. The second pile end cooling connection confirmation CC interface is connected to the second pile end cooling CC circuit. The voltage of the detection point in the second pile end cooling CC circuit is used to indicate the connection status between the pile end liquid inlet interface, the pile end liquid outlet interface and the electric vehicle.

15. The charging pile according to claim 14, characterized in that, The second pile-end cooling CC circuit includes a second pile-end resistor unit and a pile-end voltage source. The second pile-end cooling connection confirmation CC interface is connected to the pile-end voltage source through the second pile-end resistor unit.

16. The charging pile according to claim 15, characterized in that, The detection point is located between the second pile-end resistor unit and the second pile-end cooling connection confirmation CC interface. The charging pile is used for: When the voltage at the detection point reaches the first preset value, it is confirmed that the pile end liquid inlet and the pile end liquid outlet are successfully connected to the electric vehicle.

17. The charging pile according to claim 15, characterized in that, The second pile end cooling CC circuit also includes a normally closed switch, which is connected between the second pile end resistor unit and the second pile end cooling connection confirmation CC interface; The detection points include a first detection point and a second detection point. The first detection point is located between the second pile end resistor unit and the normally closed switch, and the second detection point is located between the normally closed switch and the second pile end cooling connection confirmation CC interface. The charging pile is used for: When the voltage at the first detection point reaches the first preset value and the voltage at the second detection point reaches the first preset value, it is confirmed that the pile end liquid inlet interface and the pile end liquid outlet interface are successfully connected to the electric vehicle.

18. The charging pile according to any one of claims 13 to 17, characterized in that, The charging pile also includes a first pile end cooling CC interface and a first pile end cooling CC circuit. The first pile end cooling CC circuit includes a first resistor unit, and the first pile end cooling CC interface is grounded through the first pile end resistor unit. The first pile-end cooling CC circuit is used to connect with the vehicle-end cooling of the electric vehicle to confirm that the CC circuit forms a current loop.

19. The charging pile according to any one of claims 14 to 18, characterized in that, The charging pile output interface includes a DC interface and a CC interface. The DC interface is used to transmit the DC power converted by the multiple power conversion devices to the electric vehicle. The charging pile is also used for: Detect the voltage of the charging CC interface at the charging pile end; When the voltage at the charging CC interface at the charging pile reaches a second preset value, the power conversion device is controlled to output the DC power.

20. The charging pile according to claim 19, characterized in that, The charging pile is also used for: Upon confirming that the DC interface at the charging pile end and the electric vehicle are successfully connected, and that the liquid inlet interface at the charging pile end and the liquid outlet interface at the charging pile end are successfully connected to the electric vehicle, an authentication message is sent to the electric vehicle. The authentication message is used to indicate that the charging pile has the function of output power greater than or equal to the preset power.

21. The charging pile according to any one of claims 13 to 20, characterized in that, The liquid cooling equipment also includes a compressor, a condenser, a first throttle valve, and a first heat exchanger; The first heat exchanger includes a first heat exchange channel and a second heat exchange channel. The compressor, the condenser, the first throttle valve and the first heat exchange channel are connected in sequence to form a first cooling circuit. The two ends of the second heat exchange channel are respectively connected to the pile end liquid inlet and the pile end liquid outlet, and are used to form a second cooling circuit with the cooling channel of the electric vehicle; The first cooling circuit exchanges heat with the second cooling circuit through the first heat exchanger to cool the cooling medium in the second cooling circuit, which is used to cool the power battery of the electric vehicle.

22. The charging pile according to claim 21, characterized in that, The liquid cooling device also includes a first three-way valve, a second three-way valve, and a radiator; The three valve ports of the first three-way valve are respectively connected to one end of the second heat exchange channel, one end of the radiator, and the liquid outlet of the pile end; The three valve ports of the second three-way valve are respectively connected to the other end of the second heat exchange channel, the other end of the radiator, and the liquid inlet port at the pile end; The radiator is used to form a third cooling circuit with the cooling channel of the electric vehicle through the liquid outlet port and the liquid inlet port at the pile end, and the third cooling circuit is used to cool the electric vehicle.

23. The charging pile according to claim 22, characterized in that, The liquid cooling device further includes a water pump connected between the first three-way valve and the pile end liquid outlet; or, the water pump is connected between the second three-way valve and the pile end liquid inlet.

24. The charging pile according to any one of claims 21 to 23, characterized in that, The charging pile also includes a charging gun, and the liquid cooling device further includes a charging gun cooling circuit, a second heat exchanger, and a second throttle valve; wherein... The charging gun is electrically connected to the plurality of power conversion devices, the charging output interface at the charging end is disposed in the charging gun, and the charging gun cooling circuit is used to cool the charging gun; The second heat exchanger includes a third heat exchange channel and a fourth heat exchange channel. The compressor, the condenser, the second throttle valve and the third heat exchange channel are connected in sequence to form a fourth cooling circuit. The fourth heat exchange channel is connected to the charging gun cooling circuit. The fourth cooling circuit exchanges heat with the charging gun cooling circuit through the second heat exchanger to cool the coolant in the charging gun cooling circuit.

25. The charging pile according to any one of claims 21 to 23, characterized in that, The liquid cooling equipment also includes a four-way valve and a liquid storage tank; The output end of the compressor, one end of the condenser, the other end of the first heat exchange channel, and the first interface of the liquid storage tank are respectively connected to one valve port of the four-way valve. The input end of the compressor is connected to the second interface of the liquid storage tank, and the other end of the condenser is connected to one end of the first heat exchange channel through the first throttling valve.

26. The charging pile according to claim 25, characterized in that, The charging pile is also used for: The four-way valve is controlled to open the channel between the output end of the compressor and one end of the condenser, and the channel between the other end of the first heat exchange channel and the first interface of the liquid storage tank, to form the first cooling circuit.

27. The charging pile according to claim 25 or 26, characterized in that, The charging pile is also used for: The four-way valve is controlled to open the channel between the output end of the compressor and the other end of the first heat exchange channel, and the channel between one end of the condenser and the second interface of the liquid storage tank, to form a first heating circuit. The first heating circuit exchanges heat with the second cooling circuit through the first heat exchanger to heat the cooling medium of the second cooling circuit.

28. The charging pile according to claim 24, characterized in that, The liquid cooling equipment also includes a four-way valve and a liquid storage tank; The output end of the compressor, one end of the condenser, the other end of the first heat exchange channel, and the first interface of the liquid storage tank are respectively connected to one valve port of the four-way valve. The input end of the compressor is connected to the second interface of the liquid storage tank. The other end of the condenser is connected to one end of the first heat exchange channel through the first throttle valve. The other end of the condenser is also connected to one end of the third heat exchange channel through the second throttle valve. The other end of the third heat exchange channel is connected to the third connection port of the liquid storage tank.

29. The charging pile according to claim 28, characterized in that, The liquid cooling device further includes a first shut-off valve and a second shut-off valve. The first shut-off valve is connected between the other end of the condenser and the first throttling valve, and the second shut-off valve is connected between the other end of the third heat exchange channel and the other end of the condenser.

30. The charging pile according to claim 29, characterized in that, The charging pile is also used for: The four-way valve is controlled to open the channel between the output end of the compressor and one end of the condenser, and the channel between the other end of the first heat exchange channel and the first interface of the liquid storage tank; the first shut-off valve is controlled to open and the second shut-off valve is controlled to close. or, The four-way valve is controlled to open the channel between the output end of the compressor and the other end of the first heat exchange channel, and between one end of the condenser and the first interface of the liquid storage tank; the first shut-off valve is controlled to close, and the second shut-off valve is controlled to open.

31. The charging pile according to claim 29, characterized in that, The liquid cooling device also includes a third shut-off valve, which is connected between the other end of the third heat exchange channel and the third interface of the liquid storage tank.

32. The charging pile according to claim 31, characterized in that, The charging pile is also used for: The four-way valve is controlled to open the channel between the output end of the compressor and one end of the condenser, and the channel between the other end of the first heat exchange channel and the first interface of the liquid storage tank; the first shut-off valve is controlled to open, the second shut-off valve is controlled to close, and the third shut-off valve is controlled to open. The four-way valve is controlled to open the channel between the output end of the compressor and the other end of the first heat exchange channel, and the channel between one end of the condenser and the first interface of the liquid storage tank; the first shut-off valve is controlled to close, the second shut-off valve is opened, and the third shut-off valve is closed. or, The four-way valve is controlled to open the channel between the output end of the compressor and the other end of the first heat exchange channel, and between one end of the condenser and the first interface of the liquid storage tank; the first shut-off valve is controlled to close, the second shut-off valve is controlled to close, and the third shut-off valve is controlled to open.

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