External power battery thermal management system

Abstract

The invention discloses an external power battery thermal management system, and relates to the technical field of vehicle thermal management, the external power battery thermal management system comprises a vehicle end thermal management loop and a station end thermal management loop, the vehicle end thermal management loop is arranged on a vehicle, and the vehicle end thermal management loop comprises a battery unit and a vehicle battery thermal management unit which are connected; the vehicle battery thermal management unit is used for heat exchange of the battery unit. The station end heat management loop is arranged in the charging station and comprises a station end battery heat management unit, a first stop valve, a controller and a connector which are communicated, the connector is used for being detachably connected with the vehicle end heat management loop when a vehicle is connected into the charging station, and the controller can automatically control the stop valve to be switched to the closed state when the charging station breaks down. The first stop valve and the controller are arranged in the station end heat management loop, when the charging station breaks down, the controller can automatically control the stop valve to be switched to the closed state, the heat management loop of the vehicle end and the station end is cut off in time, and leakage of cooling liquid is effectively prevented.

Description

Technical Field

[0001] This invention relates to the field of vehicle thermal management technology, and more specifically to an external power battery thermal management system. Background Technology

[0002] Current pure electric vehicles employ either independent cooling systems or integrated thermal management systems that combine the battery and air conditioning systems. The thermal management of the battery relies entirely on the vehicle-side thermal management system. However, with the development of fast charging technology, the vehicle-side thermal management system is increasingly unable to meet the demands of high-rate fast charging. Therefore, a charging station-side thermal management system has been introduced. By connecting the vehicle-side and station-side thermal management systems when the electric vehicle connects to the charging station, the station-side cooling system is utilized during charging to meet the demands of high-rate charging, thereby reducing the vehicle-side thermal management costs and energy consumption.

[0003] However, the thermal management system connecting the vehicle and station ends still has shortcomings. For example, the thermal management system does not have an emergency protection structure. When a charging failure occurs, it cannot shut down the coolant circuit in time, which can lead to coolant leakage and make it impossible to ensure system safety or monitor and adjust the liquid level, resulting in coolant overflow during charging or coolant shortage after charging is completed. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose an external power battery thermal management system. This solves the technical problem that the existing thermal management system does not have an emergency protection structure, and cannot shut down the coolant circuit in time when a charging failure occurs, resulting in easy coolant leakage and failure to ensure system safety.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: This invention provides an external power battery thermal management system, comprising: A vehicle-side thermal management circuit, comprising a battery cell, a vehicle battery thermal management unit, and a connector connected in sequence, wherein the vehicle battery thermal management unit is used for heat exchange of the battery cell; and The station-end thermal management circuit includes a station-end battery thermal management unit, a first shut-off valve, and a controller connected in series. The station-end battery thermal management unit is configured as a connector that can be detachably connected to the vehicle-end thermal management circuit. The controller can automatically control the shut-off valve to switch to the closed state when the charging station fails.

[0006] In some embodiments, the station-end thermal management circuit further includes a throttle valve, which is connected in parallel to the station-end battery thermal management unit, and the first shut-off valve is provided at both the inlet and outlet ends of the station-end thermal management circuit.

[0007] In some embodiments, the vehicle-side thermal management circuit includes a main heat exchange circuit and a degassing circuit. The main heat exchange circuit has the battery cell and the vehicle battery thermal management unit. The degassing circuit is connected in parallel to the main heat exchange circuit and has an expansion tank.

[0008] In some embodiments, the degassing circuit further includes a second shut-off valve located between the expansion tank and the battery cell.

[0009] In some embodiments, the degassing circuit further includes a third shut-off valve located between the expansion tank and the vehicle battery thermal management unit.

[0010] In some embodiments, the main heat exchange circuit further includes a heater and a one-way valve, the one-way valve being located on the side of the heater away from the vehicle battery thermal management unit.

[0011] In some embodiments, the expansion tank is equipped with a liquid level sensor, which is connected to a controller. When the liquid level sensor reading is lower than a preset liquid level, the controller issues a warning signal.

[0012] In some embodiments, the external power battery thermal management system further includes a heat exchange unit connected to the vehicle-side thermal management circuit and used for heat exchange of the coolant flowing through the vehicle-side thermal management circuit.

[0013] In some embodiments, the heat exchange unit includes a compressor, a condenser, an electronic expansion valve, and a heat exchanger connected in sequence. The heat exchanger is connected to the vehicle-end thermal management circuit, and the coolant in the vehicle-end thermal management circuit can exchange heat with the heat exchanger. The compressor is used to compress the low-temperature, low-pressure refrigerant, transforming it into a high-temperature, high-pressure state to drive the refrigerant to circulate in the system. The condenser is used to condense the gaseous refrigerant into a liquid state. The electronic expansion valve is used to regulate the flow rate of the liquid refrigerant and to convert the high-pressure liquid refrigerant into a low-pressure mist.

[0014] In some embodiments, the heat exchange unit further includes a coolant circuit connected to the heat exchanger, the coolant circuit having a water pump and a first temperature sensor and a second temperature sensor.

[0015] Compared with existing technologies, the external power battery thermal management system provided by this invention allows the vehicle-side thermal management circuit and the station-side thermal management circuit to be connected via a connector. When a vehicle connects to a charging station, the station's cooling capacity can directly benefit the vehicle's battery cells, achieving more efficient heat exchange and improving the overall efficiency of the thermal management system. This addresses the need for high-rate charging and further reduces vehicle-side thermal management costs and energy consumption. Furthermore, by installing a first shut-off valve and controller in the station-side thermal management circuit, the controller automatically switches the shut-off valve to the closed state when a charging station malfunctions, promptly cutting off the vehicle-side and station-side thermal management circuits. This effectively prevents coolant leakage, ensuring the safety of the thermal management system. Simultaneously, the coolant level is monitored in real-time during charging to ensure a normal coolant level during or after charging. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the external power battery thermal management system provided in an embodiment of the present invention; Figure 2 This is a structural schematic diagram provided in an embodiment of the present invention. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0018] To address the technical problem in existing thermal management systems that lack emergency protection structures and cannot promptly shut off the coolant circuit in the event of a charging malfunction, leading to coolant leakage and compromising system safety, this invention provides an external power battery thermal management system. This system can promptly disconnect the thermal management circuit between the vehicle and the station when a charging station malfunctions, effectively preventing coolant leakage and ensuring the safety of the thermal management system. Simultaneously, it monitors the coolant level in real time during charging to ensure a normal coolant level during or after charging.

[0019] It should be noted that the external power battery thermal management system described in this invention is used in, but not limited to, new energy electric vehicles. For ease of explanation, this invention will only use the application of the external power battery thermal management system in new energy electric vehicles as an example. The principle of the external power battery thermal management system applied to other types of equipment is essentially the same as that applied to new energy electric vehicles, and will not be described in detail here.

[0020] Please see Figure 1 , Figure 1This is a schematic diagram of the structure of an external power battery thermal management system in one embodiment of the present invention. The external power battery thermal management system includes a vehicle-side thermal management circuit 1 and a station-side thermal management circuit 2. The vehicle-side thermal management circuit 1 is located in the vehicle, for example, in the battery frame assembly of a new energy electric vehicle. The vehicle-side thermal management circuit 1 includes a battery cell 11, a vehicle battery thermal management unit 12, and a connector 23 connected in sequence. The vehicle battery thermal management unit 12 is used to perform heat exchange on the battery cell 11 to ensure that the battery cell 11 operates normally within a suitable temperature range. For example, it heats up the battery cell 11 in cold winter environments and cools down the battery cell 11 in hot summer environments, thereby improving the battery's performance and service life. The station-side thermal management circuit 2 is located at the charging station. The station-side thermal management circuit 2 includes a station-side battery thermal management unit 21, a first shut-off valve 22, and a controller that are connected to each other. The station-side battery thermal management unit 21 is used to detachably connect to the connector 23 of the vehicle-side thermal management circuit 1 when the vehicle enters the charging station. The controller can automatically control the first shut-off valve 22 to switch to the closed state when the charging station fails, so as to cut off the thermal management circuit between the vehicle-side and the station-side in a timely manner, effectively prevent coolant leakage, and ensure the safety of the thermal management system.

[0021] The controller mentioned above can be of various types of electronic control units. Its main function is to monitor the operating status of the vehicle-side thermal management circuit 1 and control the actions of various components according to preset logic and sensor feedback signals to achieve automatic control and fault protection of the system, such as controlling the first shut-off valve 22 to switch to the closed or closed state.

[0022] This invention further reduces the configuration of vehicle-side power battery thermal management. The vehicle-side thermal management circuit only needs to meet the battery thermal management requirements when the electric vehicle is in motion, without considering the battery thermal management requirements when the electric vehicle is charging. By introducing a station-side thermal management circuit, the vehicle-side thermal management circuit and the station-side thermal management circuit system are connected. During charging, station-side cooling is used to meet the thermal management requirements of the vehicle-side battery cells. This solution can improve the utilization rate of the overall vehicle layout space, meet the requirements of high-rate charging, and at the same time reduce the manufacturing cost and energy consumption of the overall vehicle power battery thermal management system.

[0023] In one embodiment, please refer to Figure 2The station-side thermal management circuit 2 also includes a throttle valve 24, which is connected in parallel to the station-side battery thermal management unit 21. In this embodiment, by adjusting the opening of the throttle valve 24, the coolant flow rate in the station-side thermal management circuit 2 can be controlled, thereby adjusting the heat exchange effect of the station-side battery thermal management unit 21. Both the inlet and outlet ends of the station-side thermal management circuit 2 are equipped with first shut-off valves 22, further enhancing system safety. When a charging station malfunctions, the controller can control both first shut-off valves 22 to close simultaneously, forming a dual protection mechanism. Even if one shut-off valve malfunctions or fails to close completely, the other shut-off valve can still effectively cut off the thermal management circuit between the vehicle and the station, preventing coolant leakage and ensuring system safety. When a vehicle enters or leaves the charging station, the two shut-off valves can control the coolant flow at the inlet and outlet respectively, avoiding coolant leakage or backflow due to misoperation, further improving system reliability.

[0024] In one embodiment, please refer to Figure 2 The vehicle-side thermal management circuit 1 includes a main heat exchange circuit 13 and a degassing circuit 14. The main heat exchange circuit 13 has a battery unit 11 and a vehicle battery thermal management unit 12. The main heat exchange circuit 13 is the main heat exchange channel of the vehicle-side thermal management circuit 1. The degassing circuit 14 is connected in parallel to the main heat exchange circuit 13. The degassing circuit 14 has an expansion tank 141. The expansion tank 141 can accommodate the volume change of the coolant when the temperature changes, preventing the coolant from overflowing or generating excessive pressure due to thermal expansion and contraction, and playing a buffering and regulating role.

[0025] Further, please refer to Figure 2 The degassing circuit 14 also has a second shut-off valve 142, which is located between the expansion tank 141 and the battery unit 11. In this embodiment, the flow of coolant between the degassing circuit 14 and the main heat exchange circuit 13 can be controlled by controlling the opening and closing of the second shut-off valve 142, thereby further improving the flexibility and safety of the system.

[0026] Further, please refer to Figure 2 The degassing circuit 14 also has a third shut-off valve 143, which is located between the expansion tank 141 and the vehicle battery thermal management unit 12. It works in conjunction with the second shut-off valve 142 to more precisely control the flow of coolant in the degassing circuit 14, providing a more reliable guarantee for the thermal management of the system.

[0027] In one embodiment, please refer to Figure 2The main heat exchange circuit 13 also includes a heater (PTC) 131 and a one-way valve 132. The heater 131 can heat the coolant in a low-temperature environment, enabling the battery cell 11 to quickly heat up to a suitable operating temperature and improve the battery's charging and discharging performance. The one-way valve 132 is located on the side of the heater 131 away from the vehicle battery thermal management unit 12 to prevent coolant backflow and ensure that the coolant flows unidirectionally in the main heat exchange circuit 13, thereby improving the efficiency and stability of heat exchange.

[0028] In one embodiment, please refer to Figure 2 The expansion tank 141 is equipped with a level sensor 144, which is connected to the controller. When the level sensor 144 detects that the coolant level in the expansion tank 141 is not within the preset height range, the controller issues a warning signal to remind the system to replenish or release coolant in time. This prevents the thermal management system from malfunctioning due to insufficient coolant, or from spraying coolant due to excessive coolant, which could affect the performance and safety of the battery cell 11. The warning signal may be, for example, a buzzer, an audible and visual signal, or corresponding text or color signals displayed on the vehicle's screen.

[0029] In one embodiment, please refer to Figure 2 The external power battery thermal management system also includes a heat exchange unit 3. The heat exchange unit 3 can be connected to the vehicle battery thermal management unit 12 or the station-end battery thermal management unit 21, or both the vehicle battery thermal management unit 12 and the station-end battery thermal management unit 21 can be connected to the heat exchange unit 3. The heat exchange unit 3 is mainly used for heat exchange with the flowing coolant, such as for cooling. When the heat exchange unit 3 is connected to the vehicle battery thermal management unit 12, it can cool the coolant flowing through the vehicle-end thermal management circuit 1; when the heat exchange unit 3 is connected to the station-end battery thermal management unit 21, it can cool the coolant flowing through the station-end battery thermal management unit 21.

[0030] The heat exchange unit 3 can be considered as an independent heat exchange system, whose main function is to exchange heat with the coolant. For example, when the coolant temperature is high, the heat exchange unit 3 can be activated to cool the coolant. When the coolant flows through the battery cell, it can cool the battery cell, further optimizing the thermal management effect of the vehicle-side thermal management circuit 1 and improving the overall performance of the system.

[0031] In one embodiment, please refer to Figure 2The heat exchange unit 3 includes a compressor 31, a condenser 32, an electronic expansion valve 33, and a heat exchanger 34 connected in sequence. The heat exchanger 34 is connected to the vehicle-side thermal management circuit 1, allowing the coolant in the circuit to exchange heat with it. The compressor 31 compresses the low-temperature, low-pressure refrigerant, transforming it into a high-temperature, high-pressure state to power the refrigeration cycle. The condenser 32 condenses the gaseous refrigerant into a liquid state, releasing heat. The electronic expansion valve 33 regulates the flow rate of the liquid refrigerant and converts the high-pressure liquid refrigerant into a low-pressure mist. By controlling the opening of the electronic expansion valve 33, the refrigerant flow rate can be precisely adjusted, thereby controlling the heat exchange effect of the heat exchanger 34 and further optimizing the thermal management effect of the vehicle-side thermal management circuit 1. Additionally, the heat exchange unit 3 includes a cooling fan 36, which blows air onto the condenser 32 to dissipate heat and achieve better cooling.

[0032] The heat exchange unit 3 also includes two temperature and pressure sensors 37, which are respectively located on both sides of the compressor 31 to monitor the temperature and pressure of the refrigerant on both sides of the compressor 31. Both temperature and pressure sensors 37 are connected to the controller, and all the aforementioned electronic components are also connected to the controller. When the temperature and pressure sensors 37 detect that the temperature and pressure of the refrigerant are not within the preset range, the controller automatically controls the compressor 31, the cooling fan 36, and the electronic expansion valve 33 to adjust their operating states so that the temperature and pressure of the refrigerant are adjusted to the preset range.

[0033] In one embodiment, please refer to Figure 2 The heat exchange unit 3 also includes a coolant circuit 35, which is connected to the heat exchanger 34. The coolant circuit 35 has a water pump 351, a first temperature sensor 352, and a second temperature sensor 353. The water pump 351 is used to drive the coolant to circulate in the coolant circuit 35, ensuring that the coolant can fully exchange heat with the heat exchanger 34. The first temperature sensor 352 and the second temperature sensor 353 are used to monitor the temperature of the coolant in real time and feed the temperature signal back to the controller. The controller adjusts the working state of the heat exchange unit 3 according to the temperature signal, so as to realize the precise control of the coolant temperature of the vehicle-side thermal management circuit 1, and further improve the thermal management performance and reliability of the system.

[0034] To better understand this invention, the following is combined with... Figures 1 to 2 The technical solution of the present invention will be described in detail below: Please see Figure 1 and Figure 2When a vehicle connects to a charging station, connector 23 connects the vehicle-side thermal management circuit 1 and the station-side thermal management circuit 2 to form a complete thermal management circuit. Under normal operating conditions, the station-side thermal management circuit 2 cools or heats the coolant in the vehicle-side thermal management circuit 1 through the station-side battery thermal management unit 21 to meet the thermal management requirements of the battery cell 11. Simultaneously, the heat exchange unit 3 also participates in the operation, exchanging heat with the coolant through the compressor 31, condenser 32, electronic expansion valve 33, and heat exchanger 34 to further optimize the thermal management effect.

[0035] Please see Figure 1 and Figure 2 When a charging station malfunctions, the controller can automatically detect the fault signal and quickly control the first shut-off valve 22 to switch to the closed state, cutting off the thermal management circuit between the vehicle and the station to prevent coolant leakage. Simultaneously, the level sensor 144 monitors the coolant level in the expansion tank 141 in real time. When the level is outside the preset range, the controller issues a warning signal and automatically controls the system to replenish or release coolant in a timely manner. Furthermore, by adjusting the opening of the throttle valve 24, the second shut-off valve 142, and the third shut-off valve 143, the system's thermal management effect and safety can be further optimized.

[0036] Heater 131 heats the coolant in a low-temperature environment, enabling the battery unit 11 to quickly reach a suitable operating temperature. One-way valve 132 ensures unidirectional flow of the coolant in the main heat exchange circuit 13, improving heat exchange efficiency and stability. Simultaneously, water pump 351 drives the coolant to circulate in the coolant circuit 35. First temperature sensor 352 and second temperature sensor 353 monitor the coolant temperature in real time. The controller adjusts the operating status of the heat exchange unit 3 based on the temperature signals, achieving precise control of the coolant temperature.

[0037] The entire external power battery thermal management system achieves efficient thermal management of the power battery through the coordinated operation of the vehicle-side thermal management loop 1, the station-side thermal management loop 2, and the heat exchange unit 3. Under normal operating conditions, the system can automatically adjust the temperature and flow rate of the coolant according to the thermal management requirements of the battery cell 11, ensuring that the battery cell 11 operates within a suitable temperature range. In the event of a fault, the system can promptly disconnect the thermal management loop to prevent coolant leakage, thus ensuring the safety and reliability of the system.

[0038] When the vehicle or battery unit is in cooling mode, the vehicle battery thermal management unit 12 and the station battery thermal management unit 21 respectively activate the cooling mode; the compressor 31 and cooling fan 36 of the heat exchange unit 3 are turned on, and the water pump 351 in the coolant circuit 35 is turned on. In the refrigerant circuit, the compressor 31 drives the gaseous refrigerant to flow to the condenser 32. After exchanging heat with the external environment, the refrigerant changes from a gaseous state to a liquid state. The liquid refrigerant flows through the electronic expansion valve 33 for throttling and then flows through the heat exchanger 34. The liquid refrigerant turns back to a gaseous state to absorb heat and then flows back to the compressor 31. Two temperature and pressure sensors 37 monitor the pressure and temperature of the refrigerant circuit. At the same time, the water pump 351 of the coolant circuit drives the coolant to flow through the heat exchanger 34 to exchange heat with the refrigerant circuit, completing the cooling of the coolant. After the coolant is cooled, it continues to flow through the heat exchanger 34. Figure 1 The flow in the circuit shown exchanges heat with the battery cell 11.

[0039] When the vehicle is in cooling mode, the vehicle thermal management circuit 1 activates the cooling mode, the heater 131 is turned off, the connector 23 is closed, and the second shut-off valve 142 and the third shut-off valve 143 are opened. At this time, the vehicle thermal management circuit 1 generates coolant at a lower temperature and drives the coolant to flow through the heater 131 (the heater is not working), and then through the one-way valve 132 into the battery cell 11 for heat exchange, which cools down the battery cell 11. Part of the coolant that has been sufficiently heated returns directly to the vehicle battery thermal management unit 12 along the main heat exchange circuit 13, and the other part flows to the degassing circuit 14. The coolant flows through the second shut-off valve 142 through the expansion tank 141 for degassing, and then the coolant flows back to the vehicle battery thermal management unit 12 through the third shut-off valve 143.

[0040] When the vehicle is in motion or charging, and the vehicle-side thermal management circuit 1 is in heating mode, the vehicle-side thermal management circuit 1 activates the heating mode, the heater 131 is turned on, the connector 23 is closed, and both the second shut-off valve 142 and the third shut-off valve 143 are open. At this time, the vehicle-side thermal management circuit 1 drives the coolant at a lower temperature to flow through the heater 131 (the heater is working) for heating. After the coolant is heated, it enters the battery cell 11 through the one-way valve 132 for heat exchange, which raises the temperature of the battery cell 11. Part of the fully heated coolant returns directly to the vehicle battery thermal management unit 12 along the main heat exchange circuit 13, while the other part flows to the degassing circuit 14. The coolant flows through the second shut-off valve 142 and through the expansion tank 141 for degassing, and then the coolant flows back to the vehicle battery thermal management unit 12 through the third shut-off valve 143.

[0041] When the vehicle is connected to the charging station for charging, the vehicle-side thermal management circuit 1 and the station-side thermal management circuit 2 are connected through connector 23. In vehicle-side thermal management circuit 1, heater 131 is closed and connector 23 is open. In station-side thermal management circuit 2, both first shut-off valves 22 are open and throttle valve 24 is also open. After the charging station starts charging, the station-side battery thermal management unit 21 starts the cooling mode, driving the coolant at a lower temperature to flow through the first shut-off valve 22. The coolant flows through connector 23 to the battery unit 11 for heat exchange, which cools the battery unit 11. The coolant with sufficient heat exchange flows directly back to connector 6 through vehicle-side thermal management circuit 1, and then returns to station-side battery thermal management unit 21 through the first shut-off valve 22. During the charging process, the system can adjust the liquid level of the vehicle-end expansion tank 141 in real time by controlling the switching of the second shut-off valve 142 and the third shut-off valve 143 based on the liquid level signal fed back by the liquid level sensor 144. This prevents the liquid level of the vehicle-end expansion tank 141 from being too high or too low. At the same time, the throttle valve 24 is used to regulate the pressure at both ends to avoid excessive pressure from the station end to the vehicle end, which could damage the cooling system components at the vehicle end.

[0042] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An external power battery thermal management system, characterized in that, include: A vehicle-side thermal management circuit, comprising a battery cell, a vehicle battery thermal management unit, and a connector connected in sequence, wherein the vehicle battery thermal management unit is used for heat exchange of the battery cell; and The station-end thermal management circuit includes a station-end battery thermal management unit, a first shut-off valve, and a controller connected in series. The station-end battery thermal management unit is configured as a connector that can be detachably connected to the vehicle-end thermal management circuit. The controller can automatically control the shut-off valve to switch to the closed state when the charging station fails.

2. The external power battery thermal management system according to claim 1, characterized in that, The station-end thermal management circuit also includes a throttle valve, which is connected in parallel to the station-end battery thermal management unit. The first shut-off valve is provided at both the inlet and outlet ends of the station-end thermal management circuit.

3. The external power battery thermal management system according to claim 1, characterized in that, The vehicle-side thermal management circuit includes a main heat exchange circuit and a degassing circuit. The main heat exchange circuit has the battery unit and the vehicle battery thermal management unit. The degassing circuit is connected in parallel to the main heat exchange circuit and has an expansion tank.

4. The external power battery thermal management system according to claim 3, characterized in that, The degassing circuit also has a second shut-off valve, which is located between the expansion tank and the battery unit.

5. The external power battery thermal management system according to claim 4, characterized in that, The degassing circuit also has a third shut-off valve, which is located between the expansion tank and the vehicle battery thermal management unit.

6. The external power battery thermal management system according to claim 3, characterized in that, The main heat exchange circuit also includes a heater and a one-way valve, with the one-way valve located on the side of the heater away from the vehicle battery thermal management unit.

7. The external power battery thermal management system according to claim 6, characterized in that, The expansion tank is equipped with a liquid level sensor, which is connected to a controller. When the liquid level in the expansion tank is not within the preset height range, the controller issues a warning signal.

8. The external power battery thermal management system according to claim 1, characterized in that, The external power battery thermal management system also includes a heat exchange unit, which is connected to the vehicle-end thermal management circuit and is used to exchange heat with the coolant flowing through the vehicle-end thermal management circuit.

9. The external power battery thermal management system according to claim 8, characterized in that, The heat exchange unit includes a compressor, a condenser, an electronic expansion valve, and a heat exchanger connected in sequence. The heat exchanger is connected to the vehicle-end thermal management circuit, and the coolant in the vehicle-end thermal management circuit can exchange heat with the heat exchanger. The compressor is used to compress the low-temperature, low-pressure refrigerant, transforming it into a high-temperature, high-pressure state to drive the refrigerant to circulate in the system. The condenser is used to condense the gaseous refrigerant into a liquid state. The electronic expansion valve is used to regulate the flow rate of the liquid refrigerant and to convert the high-pressure liquid refrigerant into a low-pressure mist.

10. The external power battery thermal management system according to claim 9, characterized in that, The heat exchange unit also includes a coolant circuit connected to the heat exchanger, and the coolant circuit has a water pump and a first temperature sensor and a second temperature sensor.

Images