A battery system charging thermal management method and system

Abstract

This invention provides a battery system charging thermal management method and system, belonging to the field of battery charging thermal management technology. First, the temperature, state of charge (SOC), and maximum output power of the charger during the battery system charging process are obtained. Then, based on the obtained battery system temperature and SOC, the allowable charging power of the battery system is calculated. When the battery system temperature meets the conditions for heating or cooling activation, the allowable charging power of the battery system is compared with the maximum output power of the charger. When the allowable charging power of the battery is less than the maximum output power of the charger, the thermal management device is activated to heat or cool the battery. When the allowable charging power of the battery is greater than or equal to the maximum output power of the charger, the thermal management device is not activated to reduce unnecessary energy consumption, thereby minimizing the energy consumption of battery system thermal management and achieving the goal of energy saving, cost reduction, and efficiency improvement.

Description

Technical Field

[0001] This invention relates to a method and system for battery charging thermal management, belonging to the field of battery charging thermal management technology. Background Technology

[0002] In recent years, with the rapid development of electric vehicles, the charging performance of power batteries, as key components of electric vehicles, is closely related to battery temperature. Both excessively high and low temperatures during charging can affect battery charging efficiency and lifespan. Therefore, battery thermal management methods are used to control battery temperature during charging to improve charging capacity at high and low temperatures, shorten charging time, and ensure battery safety. Currently, battery thermal management mainly involves collecting battery temperature data. If the battery temperature is too high or too low, a thermal management device is activated to cool or heat the battery. This method takes into account the impact of temperature on charging performance and can improve charging performance to some extent. However, battery charging performance is not only related to temperature but also to the external charger. When the charger's charging capacity is low, simply adjusting the temperature will not improve battery performance; instead, it may cause additional energy consumption during the battery thermal management process, leading to increased vehicle energy consumption. Summary of the Invention

[0003] This invention provides a battery system charging thermal management method and system to reduce unnecessary energy consumption during the battery system charging process in existing battery system thermal management methods.

[0004] This invention provides a method for thermal management of a battery system during charging, the steps of which are as follows:

[0005] 1) Obtain the battery system's temperature, SOC, and the charger's maximum output power P during the charging process. C ;

[0006] 2) Based on the obtained temperature and SOC of the battery system during the charging process, the allowable charging power P of the battery system is obtained. A When the battery system temperature meets the conditions for heating or cooling to start, compare the allowable charging power P of the battery system with the maximum output power P of the charger. C ;

[0007] 3) When the battery system's allowable charging power P is greater than or equal to the charger's maximum output power P C When the thermal management device is not activated, and the battery system's allowable charging power P is less than the charger's maximum output power P, the battery system's allowable charging power P is less than the charger's maximum output power P. C When necessary, the thermal management device is activated to heat or cool the battery system.

[0008] The battery system charging thermal management method proposed in this invention determines the magnitude of the allowable charging power of the battery system and the maximum output power of the charger when the battery system temperature meets the heating or cooling activation conditions. If the allowable charging power of the battery is greater than or equal to the maximum output power of the charger, there is no need to activate the thermal management device, thereby reducing unnecessary energy consumption, minimizing the energy consumption of battery system thermal management, and achieving the goal of energy saving, consumption reduction and cost reduction.

[0009] Furthermore, to clarify the activation conditions for heating and cooling of the thermal management system, the heating activation condition refers to the lowest temperature T of each cell in the battery system. min Less than or equal to the minimum heating temperature threshold T 1min And the highest temperature T of each cell in the battery system max Less than or equal to the maximum heating temperature threshold T 1max The cooling activation condition mentioned refers to the highest temperature T of each cell in the battery system. max Greater than or equal to the maximum cooling temperature threshold T 2max And the lowest temperature T of each cell in the battery system min Greater than or equal to the minimum cooling temperature threshold T 2min .

[0010] Furthermore, in order to reduce unnecessary energy consumption during the battery system charging process, when the battery system requires heating treatment, the lowest temperature T of each cell in the battery system is determined. min With the temperature T of the circulating water W The size of the battery system is determined by the lowest temperature T of each individual cell. min Temperature less than T of circulating water W At that time, only the water pump is activated to heat the battery system through water circulation; when the lowest temperature T of each cell in the battery system... min Temperature T of the circulating water is greater than or equal to W At this time, the water pump and the heating function of the thermal management device are turned on to heat the battery system.

[0011] Furthermore, in order to reduce energy consumption while improving the charging efficiency of the battery system, when only the water pump is activated to heat the battery system through water circulation, the real-time charging power P of the battery system and the maximum output power P of the charger are compared. C The size of the battery system is determined by the lowest temperature T of each individual cell. min Equal to circulating water temperature T W If the real-time charging power P of the battery system is still less than or equal to the maximum output power P of the charger, then... C Activate the heating function of the thermal management device.

[0012] Furthermore, in order to reduce unnecessary energy consumption during the battery system charging process, when the battery requires cooling, the highest temperature T of each individual cell in the battery system is determined.max With the temperature T of the circulating water W The size of the battery system when the highest temperature T of each cell is... max Temperature greater than T of circulating water W At that time, only the water pump is activated to cool the battery system through water circulation; when the highest temperature T of each cell in the battery system reaches... max Temperature T of the circulating water is less than or equal to W At that time, the cooling functions of the water pump and thermal management device are turned on to cool the battery system.

[0013] Furthermore, in order to reduce energy consumption while improving the charging efficiency of the battery system, when only the water pump is activated to cool the battery through water circulation, the real-time charging power P of the battery system and the maximum output power P of the charger are compared. C The size of the battery system when the highest temperature T of each cell is... max Equal to circulating water temperature T W If the real-time charging power P of the battery system is still less than or equal to the maximum output power P of the charger, then... C Activate the cooling function of the thermal management device.

[0014] Furthermore, the charging power of the battery is obtained by querying an existing power meter based on the battery temperature and SOC.

[0015] This invention proposes a battery system charging thermal management system, including a water circulation pipeline installed on the battery and equipment for heating and cooling the water circulation pipeline. A water pump is installed on the water circulation pipeline. The system also includes a controller; the controller is used to connect to the BMS to execute the battery system charging thermal management method as described in this invention.

[0016] The battery system charging thermal management system proposed in this invention can keep the battery system at a suitable temperature by heating or cooling it. At the same time, it determines the allowable charging power of the battery system and the maximum output power of the charger. When the allowable charging power of the battery is greater than or equal to the maximum output power of the charger, there is no need to activate the thermal management device, thereby reducing unnecessary energy consumption and minimizing the energy consumption of the battery system thermal management, achieving the goal of energy saving, consumption reduction and cost reduction.

[0017] Furthermore, the battery system charging thermal management system is connected to the battery system via a high-voltage distribution box, and is powered by the battery system. Attached Figure Description

[0018] Figure 1 This is a flowchart of the battery system heating management method in an embodiment of the present invention;

[0019] Figure 2 This is a flowchart of the battery system cooling management method in an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the battery thermal management system in an embodiment of the present invention. Detailed Implementation

[0021] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0022] Method Implementation Examples

[0023] This invention provides a method for thermal management of a battery system during charging, the specific steps of which are as follows: First, obtain the temperature, state of charge (SOC), and maximum output power P of the charger of the battery system during the charging process. C Based on the battery system's temperature and SOC during charging, the allowable charging power P of the battery system is obtained. When the battery system temperature meets the heating or cooling activation conditions, the allowable charging power of the battery system is compared with the charger's maximum output power. Finally, if the battery's allowable charging power P is less than the charger's maximum output power P... C In certain situations, the thermal management device is activated to heat or cool the battery. However, if the battery's allowable charging power is greater than or equal to the charger's maximum output power, the thermal management device does not need to be activated, thus reducing unnecessary energy consumption and minimizing the energy consumption of the battery system's thermal management, achieving the goal of energy saving, cost reduction, and efficiency improvement. This method embodiment describes battery system heating management and battery system cooling management from two aspects.

[0024] I. Battery System Heating Management

[0025] The specific process for battery system heating management during vehicle charging is as follows: Figure 1 As shown, in order to achieve thermal management control of the battery system, ensure that the battery system is in a suitable temperature range, shorten the charging time, and minimize the energy consumption of heating management.

[0026] First, it is necessary to obtain the battery system's temperature, state of charge (SOC), and the charger's maximum output power during the charging process. The battery system temperature includes the lowest temperature (T) of each individual battery cell. min and the highest temperature T max Then, based on the battery system temperature, it is determined whether the battery system meets the heating activation conditions. This is when the lowest temperature T of each individual cell in the battery system... min Less than or equal to the minimum heating temperature threshold T 1min And the highest temperature T of each cell in the battery system max Less than or equal to the maximum heating temperature threshold T 1max When this occurs, it indicates that the battery system meets the heating activation conditions. In this embodiment, the minimum heating temperature threshold T... 1min Set to 12℃, maximum heating temperature threshold T 1maxSet to 30℃, when the lowest temperature T of each cell in the battery system is... min The temperature is less than or equal to 12℃, and the highest temperature T of each cell in the battery system is... max The battery system meets the heating activation conditions at temperatures less than or equal to 30°C. For example, when Tmin = 3°C and T... max At 15℃, the battery system meets the conditions for heating to start.

[0027] When the battery system temperature meets the heating activation conditions, the allowable charging power P of the battery system and the maximum output power P of the charger are compared. C The magnitude of the battery system's allowable charging power (P) determines whether the thermal management device needs to be activated. This is because when the battery system's allowable charging power exceeds the charger's maximum output power, even if the thermal management device is activated to bring the battery system to a suitable temperature range, the battery's charging capacity at that temperature already exceeds the charger's maximum output power. Since the battery system can only charge at the charger's maximum output power, activating the thermal management device will not increase the battery system's charging power, but will only increase unnecessary energy consumption. For example, if the battery system's allowable charging power (P) is 100kW, and the charger's maximum output power (P...)... C With a power output of 80kW, activating the thermal management device to increase the battery system's allowable charging power P to 120kW is meaningless and does not accelerate charging efficiency. Therefore, when P is greater than P0... C At this time, there is no need to activate the thermal management device. The maximum output power of the charger is related to the charger's own power and the number of charging guns. If the charger itself has a power of 180kW and has three charging guns, then when all three charging guns are in use, each charging gun is allocated a power of 60kW. That is, the maximum power of the charger corresponding to the battery system plugged into any charging gun in the charger is 60kW.

[0028] When activating the thermal management device, first determine the lowest temperature T of each cell in the battery system. min With the temperature T of the circulating water W The size of the battery system is determined by the lowest temperature T of each individual cell. min Temperature less than T of circulating water W At this time, the thermal management device does not activate the heating function; instead, it starts the water pump to heat the battery system through water circulation. This is to avoid prematurely activating the heating function of the thermal management system and increasing unnecessary energy consumption. As water circulation begins, the minimum temperature of the battery system continuously rises. During this process, the allowable charging power P of the battery at the current temperature is compared in real time with the maximum output power P of the charger. C The magnitude of P indicates that when P is greater than or equal to Pc, it proves that the current charging capacity of the battery system meets the maximum output capacity of the charger, water circulation stops, and the battery system no longer needs to be heated; when P is less than Pc, the current charging capacity of the battery system meets the maximum output capacity of the charger, water circulation stops, and the battery system no longer needs to be heated. CAt that time, until the lowest temperature T of each cell in the battery system. min With the temperature T of the circulating water W Similarly, if the lowest temperature of the battery system is still lower than the minimum temperature T3 at which battery heating stops (T3 is the battery heating stop threshold to prevent the battery temperature from becoming too high and affecting battery performance), the thermal management device will then activate the heating function to heat the circulating water and continuously run the water pump to achieve circulating heating. During this process, the allowable charging power P of the battery at the current temperature and the maximum output power P of the charger will be continuously compared. C The size of P, if P is greater than or equal to P C When P is less than P0, the thermal management device stops heating and water circulation, and the battery system no longer needs to be heated. C Continue heating until the battery system reaches its lowest temperature T. min When T3 is greater than or equal to, heating and water circulation are stopped, and the battery system heating is completed.

[0029] In this embodiment, the battery heating stop threshold T3 is set to 15°C. For example, if the maximum output power Pc of the charger is detected to be 100kW and the allowable charging power P of the battery system is 50kW, then the allowable charging power P of the battery system is less than the maximum output power P of the charger. C Start the thermal management system. First, check the current circulating water temperature T. W The temperature is 6℃, T min 3℃ less than T W The thermal management device does not activate the heating function; it only starts the water pump to heat the battery system through water circulation. As water circulation begins, the battery's minimum temperature continuously rises. During this process, if the battery's allowable charging power of 60kW is still less than the charger's maximum output power of 100kW, water circulation continues until the battery system's minimum temperature T... min 6℃ (i.e., T) min =T W When the temperature is below the battery heating stop threshold T3 = 15℃, the thermal management device will restart the heating function, heat the circulating water, and continuously run the water pump to achieve circulating heating. During the process, the allowable charging capacity P of the battery at the current temperature and the maximum output capacity Pc of the charger will be continuously compared in real time. When P = 70kw is less than Pc = 100kw, heating will continue until the battery minimum temperature Tmin = 15℃ is greater than or equal to T3 = 15℃, at which point the battery system thermal management will stop the heating function.

[0030] When the lowest temperature T of each cell in the battery system min Temperature T of the circulating water is greater than or equal to W At this time, the thermal management device activates the heating function to heat the circulating water and continuously runs the water pump to achieve circulating heating; then, it compares in real time the battery's allowable charging power P at the current temperature with the charger's maximum output power P0. CThe size of P when P is greater than or equal to P C When P is less than P, the battery system does not require heating, and the heating function of the thermal management device is no longer activated; C Continue heating until the battery reaches its lowest temperature T. min When T3 is greater than or equal to 15°C, the battery system thermal management device stops the heating function and water circulation, completing battery heating. In this embodiment, the battery heating stop threshold T3 is set to 15°C. For example, if the maximum output power Pc of the charger is detected to be 100kW and the allowable charging power P of the battery system is 50kW, the battery system needs heating, and the thermal management device is activated. At this time, the circulating water temperature is detected to be 6°C, and the minimum temperature T of each cell in the battery system is... min If the temperature is 8°C higher than the circulating water temperature, the heating function needs to be activated to heat the circulating water and thus heat the battery system. During battery heating, if the battery's allowable charging power P is found to be 100kW, which is equal to the charger's maximum output power, when the battery's current lowest temperature is 10°C, the heating function will stop. If, during heating, the battery's allowable charging power P is consistently lower than the charger's maximum output power, the battery system's thermal management device will stop the heating function when the battery's current lowest temperature reaches 15°C, which is equal to the battery's heating stop threshold T3.

[0031] II. Battery System Cooling Management

[0032] The specific process for battery system cooling management during vehicle charging is as follows: Figure 2 As shown, the first step is to obtain the battery system's temperature, SOC, and the charger's maximum output power P during the charging process. C The battery system temperature includes the lowest temperature T of each individual cell in the battery system. min and the highest temperature T max Then, based on the battery system temperature, determine whether the battery system meets the cooling activation conditions. This is done when the highest temperature T of each individual cell in the battery system reaches [a certain value]. max Greater than or equal to the maximum cooling temperature threshold T 2max And the lowest temperature T of each cell in the battery system min Greater than or equal to the minimum cooling temperature threshold T 2min The battery system cooling activation conditions are met at this time. In this embodiment, the maximum cooling temperature threshold is set to 32°C, and the minimum cooling temperature threshold is set to 15°C. When the highest temperature T of each cell in the battery system is... max The lowest temperature T of each cell in the battery system is greater than or equal to 32℃. min The battery system cooling activation condition is met when the temperature is greater than or equal to 15℃. For example, if the highest temperature Tmax of each cell in the battery system is detected to be 45℃, and the lowest temperature T of each cell in the battery system is... min The temperature is 40℃, which meets the conditions for the battery system to start cooling.

[0033] Based on the obtained battery system temperature and SOC, the allowable charging power P of the battery system is obtained by looking up the existing power table. When the battery system temperature meets the cooling activation condition, the allowable charging power P of the battery system is compared with the maximum output power P of the charger. C The magnitude of P is used to determine whether the thermal management device needs to be activated. Similar to the battery system cooling management method described above, when P is greater than or equal to P... C At this point, the battery system's current charging capacity already meets the charger's maximum output capacity, and there is no need to activate the thermal management device. For example, when the battery system's allowable charging power is 120kW and the charger's maximum output power is 80kW, there is no need to activate the thermal management device.

[0034] When the thermal management device is activated, the highest temperature T of each cell in the battery system is first determined. max and circulating water temperature T W The size, when the temperature T of the circulating water W Less than the highest temperature T of each cell in the battery system max At this time, the thermal management device does not activate its cooling function; only the water pump is activated to cool the battery through water circulation. This is to avoid prematurely activating the cooling function of the thermal management device and increasing unnecessary energy consumption. As water circulation begins, the maximum temperature of the battery system continuously decreases. During this process, the allowable charging power P of the battery system at the current temperature is compared in real time with the maximum output power Pc of the charger. When P is greater than or equal to Pc, it proves that the current charging capacity of the battery system meets the maximum output capacity of the charger, and the battery system no longer needs cooling; water circulation stops, and the battery system's thermal management device does not need to be activated. When P is less than Pc, water circulation continues until the highest temperature T of each cell in the battery system is reached. max With the temperature T of the circulating water W Similarly, when the maximum temperature Tmax of each cell in the battery system is greater than the minimum temperature T4 at which battery cooling stops (T4 is the threshold for shutting off battery cooling to prevent the battery system temperature from being too low and affecting battery performance), the thermal management device will then activate the cooling function to cool the circulating water and continuously run the water pump to achieve circulating cooling. During this process, the allowable charging power P of the battery at the current temperature and the maximum output power Pc of the charger are compared in real time. When P is greater than or equal to Pc, the thermal management device stops the cooling function and stops water circulation. The battery system no longer needs cooling, and the thermal management device does not need to be activated. When P is less than Pc, the battery system continues to cool until the maximum battery temperature Tmax is less than or equal to T4. At this point, the battery system no longer needs cooling, the battery system thermal management device stops, cooling and water circulation stop, and battery cooling is completed.

[0035] In this embodiment, the battery system cooling shutdown threshold is 30°C. For example, the highest temperature Tmax of each cell in the battery system is 45°C, and the lowest temperature Tmax of each cell in the battery system is... min At 40℃, the maximum output power of the charger was detected to be 120kW, while the allowable charging power of the battery system at the current temperature was 60kW. Therefore, the battery system required cooling. First, the current circulating water temperature was detected as 35℃. Since Tmax was higher than the circulating water temperature, the thermal management device did not activate the cooling function but instead activated the water pump to circulate water and cool the battery. As the maximum battery system temperature gradually decreased, it was found that even when the highest temperature of each individual battery cell reached 35℃, matching the circulating water temperature, the allowable charging power of the battery system was still less than 120kW. At this point, the thermal management device activated the cooling function to cool the circulating water. During the cooling process, the allowable charging power P of the battery at the current temperature was compared with the maximum output power Pc of the charger. If P still failed to reach 120kW, cooling continued until the maximum battery temperature Tmax reached 30℃, which equaled the battery system cooling shutdown threshold T4. At this point, the thermal management device stopped the cooling function.

[0036] When the temperature of the circulating water, Tw, is greater than or equal to Tmax, the thermal management device activates the cooling function to cool the circulating water and continuously operates the water pump to achieve circulating cooling; then, it compares in real time the battery's allowable charging power P at the current temperature with the charger's maximum output power P. C The size of P when P is greater than or equal to P C When P is less than P, the battery system does not require cooling, and the battery system thermal management device shuts off the cooling function; C During this process, cooling continues until the battery's lowest temperature Tmax is less than or equal to T4. At this point, the battery system's thermal management device stops the cooling function and water circulation, completing battery cooling. In this embodiment, the battery system's cooling shutdown threshold is 30°C. For example, if the charger's maximum output power Pc is detected to be 100kW and the battery system's allowable charging power P is 50kW, the battery system needs cooling, and the thermal management device is activated. At this time, the circulating water temperature is detected to be 35°C, and the highest temperature T of each cell in the battery system is... max When the temperature reaches 33℃, which is higher than the circulating water temperature, the thermal management device activates the cooling function. During this process, if the battery's current highest temperature is 32℃ and the allowable charging power P is found to be 100kW, which is equal to the charger's maximum output power, the cooling function is stopped. If, during the cooling process, the battery's allowable charging power P is found to be consistently lower than the charger's maximum output power until the battery's current highest temperature reaches 30℃, which is equal to the battery's heating stop threshold T4, the battery system's thermal management device stops the heating function.

[0037] System Implementation Examples

[0038] This invention provides a battery system charging thermal management system, such as... Figure 3 As shown, the system includes a water circulation pipeline installed on the battery and equipment for heating and cooling the water circulation pipeline. A water pump is installed on the water circulation pipeline. The system heats or cools the battery system to maintain a suitable temperature. Simultaneously, it determines the allowable charging power of the battery system and the maximum output power of the charger. If the allowable charging power of the battery is greater than or equal to the maximum output power of the charger, there is no need to activate the thermal management device, reducing unnecessary energy consumption and minimizing the energy consumption of battery system thermal management, thereby achieving energy saving, cost reduction, and efficiency improvement. The system also includes a controller connected to the BMS to execute the battery system charging thermal management method as described in the above method embodiments. The battery system charging thermal management method has been specifically described in the above method embodiments and will not be repeated here.

[0039] The battery charging thermal management system is connected to the battery system via a high-voltage distribution box and is powered by the battery system.

Claims

1. A method for thermal management during battery system charging, characterized in that, The steps of this method are as follows: 1) Obtain the battery system's temperature, SOC, and the charger's maximum output power P during the charging process. C ; 2) Based on the obtained temperature and SOC of the battery system during the charging process, the allowable charging power P of the battery system is obtained. When the battery system temperature meets the heating or cooling activation conditions, the allowable charging power P of the battery system is compared with the maximum output power P of the charger. C The heating activation condition refers to the lowest temperature T of each cell in the battery system. min Less than or equal to the minimum heating temperature threshold T 1min And the highest temperature T of each cell in the battery system max Less than or equal to the maximum heating temperature threshold T 1max ; Cooling activation condition refers to the highest temperature T of each cell in the battery system. max Greater than or equal to the maximum cooling temperature threshold T 2max And the lowest temperature T of each cell in the battery system min Greater than or equal to the minimum cooling temperature threshold T 2min ; 3) When the battery system's allowable charging power P is greater than or equal to the charger's maximum output power P C When the thermal management device is not activated, and the battery system's allowable charging power P is less than the charger's maximum output power P, the battery system's allowable charging power P is less than the charger's maximum output power P. C When the heating activation conditions are met, the thermal management device is activated to heat the battery system; when the allowable charging power P of the battery system is less than the maximum output power P of the charger... C When the cooling activation conditions are met, the thermal management device is activated to cool the battery system.

2. The battery system charging thermal management method according to claim 1, characterized in that, When the battery system requires heating treatment, determine the lowest temperature T of each individual cell in the battery system. min With the temperature T of the circulating water W The size of the battery system is determined by the lowest temperature T of each individual cell. min Temperature less than T of circulating water W At that time, only the water pump is activated to heat the battery system through water circulation; when the lowest temperature T of each cell in the battery system... min Temperature T of the circulating water is greater than or equal to W At this time, the water pump and the heating function of the thermal management device are turned on to heat the battery system.

3. The battery system charging thermal management method according to claim 2, characterized in that, During the heating process of the battery system, the allowable charging power P of the battery at the current temperature and the maximum output power P of the charger are continuously compared. C The size of P, if P is greater than or equal to P C When P is less than P, the thermal management device stops the heating function. C Continue heating until the battery system reaches its lowest temperature T. min When the battery heating stop threshold T3 is greater than or equal to the threshold value, the heating function is turned off and the water circulation is stopped.

4. The battery system charging thermal management method according to claim 2, characterized in that, When only the water pump is activated to heat the battery system through water circulation, the real-time charging power P of the battery system and the maximum output power P of the charger are compared. C The size of the battery system is determined by the lowest temperature T of each individual cell. min Equal to circulating water temperature T W If the real-time charging power P of the battery system is still less than or equal to the maximum output power P of the charger, then... C Activate the heating function of the thermal management device.

5. The battery system charging thermal management method according to claim 1, characterized in that, When the battery system requires cooling, determine the highest temperature T of each individual cell in the battery system. max With the temperature T of the circulating water W The size of the battery system when the highest temperature T of each cell is... max Temperature greater than T of circulating water W At that time, only the water pump is activated to cool the battery system through water circulation; when the highest temperature T of each cell in the battery system reaches... max Temperature T of the circulating water is less than or equal to W At this time, the cooling functions of the water pump and thermal management device are activated to cool the battery system.

6. The battery system charging thermal management method according to claim 5, characterized in that, When only the water pump is activated to cool the battery through water circulation, the real-time charging power P of the battery system and the maximum output power P of the charger are compared. C The size of the battery system when the highest temperature T of each cell is... max Equal to circulating water temperature T W If the real-time charging power P of the battery system is still less than or equal to the maximum output power P of the charger, then... C Activate the cooling function of the thermal management device.

7. The battery system charging thermal management method according to claim 1, characterized in that, The allowable charging power of the battery system is obtained by querying the existing power meter based on the battery system temperature and SOC.

8. A battery system charging thermal management system, comprising a water circulation pipeline installed on the battery and equipment for heating and cooling the water circulation pipeline, wherein a water pump is installed on the water circulation pipeline, characterized in that, The system also includes a controller; the controller is used to connect to the BMS and to perform thermal management control using the following methods: 1) Obtain the battery system's temperature, SOC, and the charger's maximum output power P during the charging process. C ; 2) Based on the obtained temperature and SOC of the battery system during the charging process, the allowable charging power P of the battery system is obtained. When the battery system temperature meets the heating or cooling activation conditions, the allowable charging power P of the battery system is compared with the maximum output power P of the charger. C The heating activation condition refers to the lowest temperature T of each cell in the battery system. min Less than or equal to the minimum heating temperature threshold T 1min And the highest temperature T of each cell in the battery system max Less than or equal to the maximum heating temperature threshold T 1max ; Cooling activation condition refers to the highest temperature T of each cell in the battery system. max Greater than or equal to the maximum cooling temperature threshold T 2max And the lowest temperature T of each cell in the battery system min Greater than or equal to the minimum cooling temperature threshold T 2min ; 3) When the battery system's allowable charging power P is greater than or equal to the charger's maximum output power P C When the thermal management device is not activated, and the battery system's allowable charging power P is less than the charger's maximum output power P, the battery system's allowable charging power P is less than the charger's maximum output power P. C When the heating activation conditions are met, the thermal management device is activated to heat the battery system; when the allowable charging power P of the battery system is less than the maximum output power P of the charger... C When the cooling activation conditions are met, the thermal management device is activated to cool the battery system.

9. The battery system charging thermal management system according to claim 8, characterized in that, The controller is also used to determine the lowest temperature T of each cell in the battery system when the battery system requires heating treatment. min With the temperature T of the circulating water W The size of the battery system is determined by the lowest temperature T of each individual cell. min Temperature less than T of circulating water W At that time, only the water pump is activated to heat the battery system through water circulation; when the lowest temperature T of each cell in the battery system... min Temperature T of the circulating water is greater than or equal to W At this time, the water pump and the heating function of the thermal management device are turned on to heat the battery system.

10. The battery system charging thermal management system according to claim 8, characterized in that, The controller is also used to continuously compare the battery's allowable charging power P at the current temperature with the charger's maximum output power P during the heating process of the battery system. C The size of P, if P is greater than or equal to P C When P is less than P, the thermal management device stops the heating function. C Continue heating until the battery system reaches its lowest temperature T. min When the battery heating stop threshold T3 is greater than or equal to the threshold value, the heating function is turned off and the water circulation is stopped.

11. The battery system charging thermal management system according to claim 8, characterized in that, The controller is also used to determine the real-time charging power P of the battery system and the maximum output power P of the charger when only the water pump is activated to heat the battery system through water circulation. C The size of the battery system is determined by the lowest temperature T of each individual cell. min Equal to circulating water temperature T W If the real-time charging power P of the battery system is still less than or equal to the maximum output power P of the charger, then... C Activate the heating function of the thermal management device.

12. The battery system charging thermal management system according to claim 8, characterized in that, The controller is also used to determine the highest temperature T of each cell in the battery system when the battery system requires cooling. max With the temperature T of the circulating water W The size of the battery system when the highest temperature T of each cell is... max Temperature greater than T of circulating water W At that time, only the water pump is activated to cool the battery system through water circulation; when the highest temperature T of each cell in the battery system reaches... max Temperature T of the circulating water is less than or equal to W At this time, the cooling functions of the water pump and thermal management device are activated to cool the battery system.

13. The battery system charging thermal management system according to claim 8, characterized in that, The controller is also used to determine the real-time charging power P of the battery system and the maximum output power P of the charger when only the water pump is activated to cool the battery through water circulation. C The size of the battery system when the highest temperature T of each cell is... max Equal to circulating water temperature T W If the real-time charging power P of the battery system is still less than or equal to the maximum output power P of the charger, then... C Activate the cooling function of the thermal management device.

14. The battery system charging thermal management system according to claim 8, characterized in that, The allowable charging power of the battery system is obtained by querying the existing power meter based on the battery system temperature and SOC.

15. The battery system charging thermal management system according to claim 8, characterized in that, The battery system charging thermal management system is connected to the battery system via a high-voltage distribution box and is powered by the battery system.

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