A heat management system and method for a power battery

Abstract

The application discloses a kind of heat management system and heat management method of power battery, belong to new energy automobile technical field, the system includes data acquisition module, control module and execution module, the input of the control module is connected with the output of the data acquisition module;The output of the control module is connected with the input of the execution module.The method includes by control module judges the temperature of power battery and the size relationship of first preset temperature, second preset temperature, third preset temperature and fourth preset temperature, by control module judges the size relationship of speed and preset speed threshold, by control module judges whether vehicle is in charging state;Control module controls execution module according to the above-mentioned judgment result to power battery is strengthened cooling, conventional cooling, strengthening heating or conventional heating, to realize the temperature of power battery is adjusted.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of new energy vehicles, and in particular, relates to a heat management system and a heat management method for a power battery. BACKGROUND

[0002] The endurance of a new energy vehicle is always a point of concern for users, and how to reduce energy consumption is a topic that cannot be avoided in the development of new vehicle models. The heat management of a new energy vehicle not only affects energy consumption, but also plays a crucial role in the safety of a power battery. However, the heat management strategy of the whole vehicle cannot be intelligently operated in accordance with the state of the power battery after being defined, and the energy consumption is relatively high.

[0003] A new energy vehicle refrigeration control method is disclosed in patent CN108819657B, which comprises the following steps: (a) judging whether the refrigeration switches of a heating and ventilation air conditioner and a battery are in an open state; (b) when the refrigeration switch of the heating and ventilation air conditioner is in an open state, steps (c) to (f) are executed; when the refrigeration switch of the heating and ventilation air conditioner is in a closed state, steps (g) to (i) are executed; (c) determining the initial speed of the compressor according to the speed corresponding to the ambient temperature and the set compressor target temperature; (d) obtaining the first corrected speed of the compressor according to the compressor speed corresponding to the air volume switch setting; (e) obtaining the second corrected speed of the compressor through P-term compensation and I-term compensation; (f) obtaining the final corrected speed of the compressor according to the first corrected speed of the compressor and the second corrected speed of the compressor; (g) determining the initial speed of the compressor according to the speed corresponding to the ambient temperature and the collected cell temperature; (h) obtaining the second corrected speed of the compressor through P-term compensation and I-term compensation; and (i) obtaining the final corrected speed of the compressor according to the initial speed of the compressor and the second corrected speed of the compressor.

[0004] However, the technology disclosed in the above patent cannot adjust the temperature of the power battery according to the temperature of the power battery. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a heat management system and a heat management method for a power battery in order to achieve the purpose of being able to adjust the temperature of the power battery according to the temperature of the power battery.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present application is as follows:

[0007] The present application provides a heat management system for a power battery, comprising a data acquisition module, a control module and an execution module, the input end of the control module being connected with the output end of the data acquisition module; the output end of the control module being connected with the input end of the execution module.

[0008] Further, the data acquisition module comprises a temperature sensor, an ambient temperature sensor, a flow sensor and a pressure sensor, and the input end of the control module is connected with the output end of the temperature sensor, the output end of the ambient temperature sensor, the output end of the flow sensor and the output end of the pressure sensor respectively.

[0009] Further, the execution module comprises a compressor, a circulating water pump, a refrigerant electronic valve, a heat exchanger, a cooling fan, a positive temperature coefficient thermistor (PTC) heater and an electronic water valve.

[0010] Further, the temperature sensor collects temperature data of the power battery and inputs the temperature data to the control module, the ambient temperature sensor collects ambient temperature data and inputs the ambient temperature data to the control module, the flow sensor collects liquid flow data in the circulating water pump and inputs the liquid flow data to the control module, and the pressure sensor collects refrigerant pressure data and inputs the refrigerant pressure data to the control module.

[0011] Further, the control module receives the temperature data of the power battery, the ambient temperature data, the liquid flow data in the circulating water pump and the refrigerant pressure data, and controls the execution module to cool or heat the power battery.

[0012] The application further provides a heat management method of a power battery, which comprises the following steps:

[0013] S1: the control module judges whether the temperature of the power battery is greater than a first preset temperature, if not, S2 is entered, and if yes, S4 is entered;

[0014] S2: the control module judges whether the temperature of the power battery is less than a second preset temperature, if not, S3 is entered, and if yes, S9 is entered;

[0015] S3: the control module judges whether the vehicle speed is greater than a preset speed threshold, if yes, S5 is entered, and if not, the control module enters a heat management mode and S1 is entered;

[0016] S4: the control module judges whether the vehicle is in a charging state, if yes, S5 is entered, and if not, S6 is entered;

[0017] S5: the control module controls the execution module to strengthen cooling of the power battery; S7 is entered;

[0018] S6: the control module controls the execution module to perform normal cooling of the power battery; S8 is entered;

[0019] S7: the control module judges whether the temperature of the power battery is not greater than a third preset temperature, if yes, S8 is entered, and if not, S5 is entered;

[0020] S8: the control module controls the execution module to stop cooling of the power battery; S20 is entered;

[0021] S9: The control module determines whether the vehicle is in a charging state, if yes, it goes to S10, if no, it goes to S11;

[0022] S10: The control module controls the execution module to perform enhanced heating on the power battery; it goes to S12;

[0023] S11: The control module controls the execution module to perform regular heating on the power battery; it goes to S13;

[0024] S12: The control module determines whether the temperature of the power battery is not less than a fourth preset temperature, if yes, it goes to S13, if no, it goes to S10;

[0025] S13: The control module controls the execution module to stop heating the power battery; it goes to S20;

[0026] S20: End.

[0027] Further, after the control module enters the heat management mode, the control module controls the execution module to cool or heat the power battery according to the ambient temperature.

[0028] Further, the time for the control module to control the execution module to perform regular cooling on the power battery is a first preset time; the time for the control module to control the execution module to perform regular heating on the power battery is a second preset time.

[0029] Further, the first preset temperature is 35 degrees Celsius; the second preset temperature is 5 degrees Celsius; the third preset temperature is 30 degrees Celsius; and the fourth preset temperature is 20 degrees Celsius.

[0030] Further, the first preset time is 20 minutes; and the second preset time is 15 minutes.

[0031] The power battery heat management system and the heat management method have the following advantages:

[0032] (1) The power battery heat management system and the heat management method can adjust the temperature of the power battery according to the temperature of the power battery.

[0033] (2) The power battery heat management system and the heat management method can realize fine and intelligent control of the heat management of the power battery.

[0034] (3) The power battery heat management system and the heat management method can adjust the temperature of the power battery according to the driving speed of the vehicle.

[0035] (4) Through the heat management system and the heat management method of the power battery of the application, the temperature of the power battery can be adjusted according to the charging state of the vehicle.

[0036] (5) In the application, the control module controls the execution module to adjust the temperature of the power battery according to the vehicle speed, the temperature of the power battery, the charging state of the vehicle and the environmental temperature, which helps to reduce unnecessary energy consumption. BRIEF DESCRIPTION OF DRAWINGS

[0037] The present specification includes the following drawings, and the contents shown are as follows:

[0038] Figure 1 is a logic structure block diagram of a heat management system of a power battery of the application;

[0039] Figure 2 is a flow chart of a heat management method of a power battery of the application.

[0040] Reference signs: 1, data acquisition module; 2, control module; 3, execution module. DETAILED DESCRIPTION

[0041] The specific embodiments of the application will be further described in detail below with reference to the drawings, and the purpose is to help the technical personnel in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical scheme of the application, and to help its implementation.

[0042] Figure 1 is a logic structure block diagram of a heat management system of a power battery of the application, including a data acquisition module 1, a control module 2 and an execution module 3, the input end of the control module 2 is connected with the output end of the data acquisition module 1; the output end of the control module 2 is connected with the input end of the execution module 3.

[0043] Among them, the data acquisition module 1 includes temperature sensor, environmental temperature sensor, flow sensor and pressure sensor, the input end of the control module 1 is connected with the output end of the temperature sensor, the output end of the environmental temperature sensor, the output end of the flow sensor and the output end of the pressure sensor respectively; the control module 2 can adopt microcontroller (MCU); the execution module 3 includes compressor, circulating water pump, refrigerant electronic valve, heat exchanger, cooling fan, positive temperature coefficient thermistor (PTC) heater, electronic water valve.

[0044] In addition, the temperature sensor collects the temperature data of the power battery and inputs the temperature data to the control module 2; the ambient temperature sensor collects the ambient temperature data and inputs the ambient temperature data to the control module 2; the flow sensor collects the liquid flow data in the circulating water pump and inputs the liquid flow data to the control module 2; the pressure sensor collects the refrigerant pressure data and inputs the refrigerant pressure data to the control module 2; the control module 2 receives the temperature data of the power battery, the ambient temperature data, the liquid flow data in the circulating water pump and the refrigerant pressure data, and controls the execution module 3 to cool or heat the power battery, that is, the system can adjust the temperature of the power battery according to the temperature of the power battery.

[0045] Figure 2 is a flow block diagram of a heat management method of a power battery of the present application, which comprises the following steps:

[0046] S1: The control module 2 judges whether the temperature of the power battery is greater than a first preset temperature, if not, it enters S2, if yes, it enters S4. That is, corresponding to S1 in the above Figure 2 Specifically, after the temperature sensor feeds back the collected temperature of the power battery to the control module 2, the control module 2 judges whether the temperature of the power battery is greater than the first preset temperature, if the control module 2 judges that the temperature of the power battery is not greater than the first preset temperature, it enters S2, if the control module 2 judges that the temperature of the power battery is greater than the first preset temperature, it enters S4.

[0047] The first preset temperature is 35 degrees Celsius.

[0048] S2: The control module 2 judges whether the temperature of the power battery is less than a second preset temperature, if not, it enters S3, if yes, it enters S9. That is, corresponding to S2 in the above Figure 2 Specifically, after the control module 2 judges that the temperature of the power battery is not greater than the first preset temperature in S1, the control module 2 judges whether the temperature of the power battery is less than the second preset temperature, if the control module 2 judges that the temperature of the power battery is not less than the second preset temperature, it enters S3, if the control module 2 judges that the temperature of the power battery is less than the second preset temperature, it enters S9.

[0049] The second preset temperature is 5 degrees Celsius.

[0050] S3: The control module 2 judges whether the vehicle speed is greater than a preset speed threshold, if yes, it enters S5, if not, the control module 2 enters the heat management mode and enters S1. That is, corresponding to Figure 2S3, specifically, after S1 and S2, when the temperature of the power battery is not less than the second preset temperature and not greater than the first preset temperature, the control module 2 judges whether the vehicle speed is greater than a preset speed threshold, if the control module 2 judges that the vehicle speed is greater than the preset speed threshold, S5 is entered, if the control module 2 judges that the vehicle speed is not greater than the preset speed threshold, the control module 2 enters the heat management mode, and thereafter S1 is entered.

[0051] The preset speed threshold is 60Km / h; the speed information of the vehicle is obtained by an electronic control unit (ECU) and input to the control module 2.

[0052] In addition, after the control module 2 enters the heat management mode, the control module 2 controls the execution module 3 to cool or heat the power battery according to the ambient temperature. Specifically, the ambient temperature sensor feeds back the collected ambient temperature to the control module 2, the control module 2 judges whether the ambient temperature fed back by the ambient temperature sensor is not greater than a fifth preset temperature, if the control module 2 judges that the ambient temperature fed back by the ambient temperature sensor is greater than the fifth preset temperature, the control module 2 controls the circulating water pump, the cooling fan and the compressor to cool the power battery, if the control module 2 judges that the ambient temperature fed back by the ambient temperature sensor is not greater than the fifth preset temperature, the control module 2 does not control the circulating water pump, the cooling fan and the compressor to cool the power battery and the control module 2 judges whether the ambient temperature fed back by the ambient temperature sensor is not less than a sixth preset temperature, if the control module 2 judges that the ambient temperature fed back by the ambient temperature sensor is less than the sixth preset temperature, the control module 2 controls the circulating water pump and the PTC heater to heat the power battery, if the control module 2 judges that the ambient temperature fed back by the ambient temperature sensor is not less than the sixth preset temperature, the control module 2 does not control the circulating water pump and the PTC heater to heat the power battery. The fifth preset temperature is 40 degrees Celsius and the sixth preset temperature is 0 degrees Celsius, that is, the temperature of the power battery can be adjusted according to the driving speed of the vehicle.

[0053] S4: the control module 2 judges whether the vehicle is in a charging state, if yes, S5 is entered, if no, S6 is entered. That is, corresponding to Figure 2 S4, specifically, after the control module 2 judges that the temperature of the power battery is greater than the first preset temperature in S1, the control module 2 judges whether the vehicle is in a charging state, if the control module 2 judges that the vehicle is in a charging state, S5 is entered, if the control module 2 judges that the vehicle is not in a charging state, S6 is entered.

[0054] The control module 2 judges whether the vehicle is in the charging state based on the information input by the vehicle control unit (VCU) to the control module 2.

[0055] S5: The control module 2 controls the execution module 3 to perform enhanced cooling on the power battery; and S7 is entered. That is, corresponding to S5 in the above embodiment, Figure 2 corresponding to S5 in the above embodiment, specifically, when the control module 2 judges that the vehicle speed at this time is greater than the preset speed threshold in S3, the control module 2 controls the circulating water pump, the cooling fan and the compressor to perform enhanced cooling on the power battery, that is, the temperature of the power battery can be adjusted according to the driving speed of the vehicle, at the same time, the temperature sensor collects the temperature of the power battery in real time and feeds back to the control module 2, and S7 is entered; when the control module 2 judges that the vehicle is in the charging state in S4, the control module 2 controls the circulating water pump, the cooling fan and the compressor to perform enhanced cooling on the power battery, that is, the temperature of the power battery can be adjusted according to the charging state of the vehicle, at the same time, the temperature sensor collects the temperature of the power battery in real time and feeds back to the control module 2, and S7 is entered.

[0056] corresponding to S5 in the above embodiment, specifically, when the control module 2 judges that the vehicle speed at this time is greater than the preset speed threshold in S3, the control module 2 controls the circulating water pump, the cooling fan and the compressor to perform enhanced cooling on the power battery, that is, the temperature of the power battery can be adjusted according to the driving speed of the vehicle, at the same time, the temperature sensor collects the temperature of the power battery in real time and feeds back to the control module 2, and S7 is entered; when the control module 2 judges that the vehicle is in the charging state in S4, the control module 2 controls the circulating water pump, the cooling fan and the compressor to perform enhanced cooling on the power battery, that is, the temperature of the power battery can be adjusted according to the charging state of the vehicle, at the same time, the temperature sensor collects the temperature of the power battery in real time and feeds back to the control module 2, and S7 is entered.

[0057] S6: The control module 2 controls the execution module 3 to perform normal cooling on the power battery; and S8 is entered. The time for the control module 2 to control the execution module 3 to perform normal cooling on the power battery is the first preset time. That is, corresponding to S6 in the above embodiment, Figure 2 corresponding to S6 in the above embodiment, specifically, when the control module 2 judges that the vehicle is not in the charging state in S4, the control module 2 controls the circulating water pump, the cooling fan and the compressor to perform normal cooling on the power battery, and the cooling time for the control module 2 to control the circulating water pump, the cooling fan and the compressor to perform normal cooling on the power battery is the first preset time, that is, the temperature of the power battery can be adjusted according to the charging state of the vehicle, and S8 is entered.

[0058] corresponding to S6 in the above embodiment, specifically, when the control module 2 judges that the vehicle is not in the charging state in S4, the control module 2 controls the circulating water pump, the cooling fan and the compressor to perform normal cooling on the power battery, and the cooling time for the control module 2 to control the circulating water pump, the cooling fan and the compressor to perform normal cooling on the power battery is the first preset time, that is, the temperature of the power battery can be adjusted according to the charging state of the vehicle, and S8 is entered.

[0059] In addition, the first preset time is 20 minutes.

[0060] S7: The control module 2 determines whether the temperature of the power battery is not greater than a third preset temperature. If yes, it goes to S8; if no, it goes to S5. That is, corresponding to S7 in the above Figure 2

[0061] The third preset temperature is 30 degrees Celsius.

[0062] S8: The control module 2 controls the execution module 3 to stop cooling the power battery; and goes to S20. That is, corresponding to S8 in the above Figure 2

[0063] S9: The control module 2 determines whether the vehicle is in a charging state. If yes, it goes to S10; if no, it goes to S11. That is, corresponding to S9 in the above Figure 2

[0064] The control module 2 determines whether the vehicle is in a charging state based on the information input by the vehicle control unit (VCU) to the control module 2.

[0065] S10: The control module 2 controls the execution module 3 to intensively heat the power battery; and goes to S12. That is, corresponding to S10 in the above Figure 2

[0066] The intensive heating refers to the control module 2 controlling the circulating water pump and the positive temperature coefficient thermistor (PTC) heater to be in a full power consumption state to work at the maximum heating capacity, so as to quickly raise the temperature of the power battery to be not less than a fourth preset temperature, with the temperature rise rate of the power battery being the highest priority. The fourth preset temperature is 20 degrees Celsius.

[0067] ​​​​S11: the control module 2 controls the execution module 3 to perform regular heating on the power battery; S13 is entered, wherein the time for the control module 2 to control the execution module 3 to perform regular heating on the power battery is the second preset time. That is, S11 corresponds to Figure 2 S11 in FIG. 1, specifically, when the control module 2 judges that the vehicle is not in the charging state in S9, the control module 2 controls the circulating water pump and the PTC heater to perform regular heating on the power battery, that is, the temperature of the power battery can be adjusted according to the charging state of the vehicle. At the same time, the temperature sensor collects the temperature of the power battery in real time and feeds back to the control module 2, and the heating time for the control module 2 to control the circulating water pump and the PTC heater to perform regular heating on the power battery is the second preset time, and S13 is entered.

[0068] In the regular heating, the control module 2 controls the circulating water pump and the PTC heater to be in a low-power state, and the power duty ratio of the circulating water pump and the PTC heater is automatically adjusted according to the temperature of the power battery, and the maximum is not more than 50%.

[0069] In addition, the second preset time is 15 minutes.

[0070] S12: the control module 2 judges whether the temperature of the power battery is not less than the fourth preset temperature, if yes, S13 is entered, and if no, S10 is entered. That is, S12 corresponds to Figure 2 S12 in FIG. 1, specifically, in the process of performing enhanced heating on the power battery by the circulating water pump and the PTC heater in S10, the control module 2 judges whether the temperature of the power battery fed back by the temperature sensor in real time is not less than the fourth preset temperature, if yes, S13 is entered, and if no, S10 is entered.

[0071] In the regular heating, the control module 2 controls the circulating water pump and the PTC heater to be in a low-power state, and the power duty ratio of the circulating water pump and the PTC heater is automatically adjusted according to the temperature of the power battery, and the maximum is not more than 50%.

[0072] S13: the control module 2 controls the execution module 3 to stop heating the power battery; S20 is entered. That is, S13 corresponds to Figure 2 S13 in FIG. 1, specifically, the control module 2 controls the circulating water pump and the PTC heater to stop heating the power battery (including enhanced heating and regular heating), and S20 is entered.

[0073] S20: end. That is, S20 corresponds to ​ S20 in FIG. 1.

[0074] The above system and method can realize fine and intelligent control of the heat management of the power battery.

[0075] Effects of the embodiment

[0076] The temperature sensor collects temperature data of the power battery and inputs the temperature data to the control module 2; the ambient temperature sensor collects ambient temperature data and inputs the ambient temperature data to the control module 2; the flow sensor collects liquid flow data in the circulating water pump and inputs the liquid flow data to the control module 2; the pressure sensor collects refrigerant pressure data and inputs the refrigerant pressure data to the control module 2; the control module 2 receives the temperature data of the power battery, the ambient temperature data, the liquid flow data in the circulating water pump and the refrigerant pressure data, and controls the execution module 3 to cool or heat the power battery, that is, the system of the present application can adjust the temperature of the power battery according to the temperature of the power battery.

[0077] The system and method of the present application can realize fine and intelligent control of the heat management of the power battery.

[0078] The control module 2 will determine whether the current vehicle speed is greater than the preset speed threshold, if yes, the control module 2 will control the circulating water pump, the cooling fan and the compressor to strengthen the cooling of the power battery, that is, the temperature of the power battery can be adjusted according to the driving speed of the vehicle, if no, the control module enters the heat management mode, the control module 2 will control the execution module 3 to cool or heat the power battery according to the ambient temperature. Specifically, the ambient temperature sensor will feed back the collected ambient temperature to the control module 2, the control module 2 will determine whether the ambient temperature fed back by the ambient temperature sensor is greater than the fifth preset temperature, if the control module 2 determines that the ambient temperature fed back by the ambient temperature sensor is greater than the fifth preset temperature, the control module 2 will control the circulating water pump, the cooling fan and the compressor to cool the power battery, if the control module 2 determines that the ambient temperature fed back by the ambient temperature sensor is not greater than the fifth preset temperature, the control module 2 will not control the circulating water pump, the cooling fan and the compressor to cool the power battery and the control module 2 will determine whether the ambient temperature fed back by the ambient temperature sensor is less than the sixth preset temperature, if the control module 2 determines that the ambient temperature fed back by the ambient temperature sensor is less than the sixth preset temperature, the control module 2 will control the circulating water pump and the positive temperature coefficient thermistor (PTC) heater to heat the power battery, if the control module 2 determines that the ambient temperature fed back by the ambient temperature sensor is not less than the sixth preset temperature, the control module 2 will not control the circulating water pump and the positive temperature coefficient thermistor (PTC) heater to heat the power battery. The fifth preset temperature is 40 degrees Celsius and the sixth preset temperature is 0 degrees Celsius, that is, the temperature of the power battery can be adjusted according to the driving speed of the vehicle, that is, the temperature of the power battery can be adjusted according to the driving speed of the vehicle.

[0079] When the control module 2 judges that the vehicle is in the charging state in S4, the control module 2 controls the circulating water pump, the cooling fan and the compressor to strengthen the cooling of the power battery, that is, the temperature of the power battery can be adjusted according to the charging state of the vehicle; when the control module 2 judges that the vehicle is not in the charging state in S4, the control module 2 controls the circulating water pump, the cooling fan and the compressor to normally cool the power battery, and the cooling time of the control module 2 to control the circulating water pump, the cooling fan and the compressor to normally cool the power battery is the first preset time, that is, the temperature of the power battery can be adjusted according to the charging state of the vehicle.

[0080] When the control module 2 judges that the vehicle is in the charging state in S9, the control module 2 controls the circulating water pump and the PTC heater to strengthen the heating of the power battery, that is, the temperature of the power battery can be adjusted according to the charging state of the vehicle; when the control module 2 judges that the vehicle is not in the charging state in S9, the control module 2 controls the circulating water pump and the PTC heater to normally heat the power battery, and the heating time of the control module 2 to control the circulating water pump and the PTC heater to normally heat the power battery is the second preset time, that is, the temperature of the power battery can be adjusted according to the charging state of the vehicle.

[0081] The application is described above with reference to the drawings. Obviously, the specific implementation of the application is not limited to the above-described manner. Any non-essential improvement made by using the method concept and technical solution of the application, or direct application of the above-described concept and technical solution of the application to other occasions without improvement, is within the protection scope of the application.

Claims

1. A method for heat management of a power battery, applied to a heat management system of the power battery, and characterized in that: The heat management system of the power battery comprises a data acquisition module, a control module and an execution module, an input end of the control module is connected with an output end of the data acquisition module, and an output end of the control module is connected with an input end of the execution module. The method comprises the following steps: S1: the control module judges whether the temperature of the power battery is greater than a first preset temperature, if not, S2 is entered, if yes, S4 is entered; S2: the control module judges whether the temperature of the power battery is less than a second preset temperature, if not, S3 is entered, if yes, S9 is entered; S3: the control module judges whether the vehicle speed is greater than a preset speed threshold, if yes, S5 is entered, if not, the control module enters a heat management mode and S1 is entered; S4: the control module judges whether the vehicle is in a charging state, if yes, S5 is entered, if not, S6 is entered; S5: the control module controls the execution module to perform enhanced cooling on the power battery; S7 is entered; S6: the control module controls the execution module to perform normal cooling on the power battery; S8 is entered; S7: the control module judges whether the temperature of the power battery is not greater than a third preset temperature, if yes, S8 is entered, if not, S5 is entered; S8: the control module controls the execution module to stop cooling the power battery; S20 is entered; S9: the control module judges whether the vehicle is in a charging state, if yes, S10 is entered, if not, S11 is entered; S10: the control module controls the execution module to perform enhanced heating on the power battery; S12 is entered; S11: the control module controls the execution module to perform normal heating on the power battery; S13 is entered; S12: the control module judges whether the temperature of the power battery is not less than a fourth preset temperature, if yes, S13 is entered, if not, S10 is entered; S13: the control module controls the execution module to stop heating the power battery; S20 is entered; S20: end.

2. The method of claim 1, wherein: The data acquisition module comprises a temperature sensor, an ambient temperature sensor, a flow sensor and a pressure sensor, the input end of the control module is connected with the output end of the temperature sensor, the output end of the ambient temperature sensor, the output end of the flow sensor and the output end of the pressure sensor respectively; the execution module comprises a compressor, a circulating water pump, a refrigerant electronic valve, a heat exchanger, a cooling fan, a PTC (Positive Temperature Coefficient) heater and an electronic water valve; the temperature sensor collects the temperature data of the power battery and inputs the temperature data to the control module; the ambient temperature sensor collects the ambient temperature data and inputs the ambient temperature data to the control module; the flow sensor collects the liquid flow data in the circulating water pump and inputs the liquid flow data to the control module; the pressure sensor collects the refrigerant pressure data and inputs the refrigerant pressure data to the control module; the control module receives the temperature data of the power battery, the ambient temperature data, the liquid flow data in the circulating water pump and the refrigerant pressure data, and controls the execution module to cool or heat the power battery.

3. The method of claim 1, wherein: After the control module enters the heat management mode, the control module controls the execution module to cool or heat the power battery according to the ambient temperature.

4. The method of claim 1, wherein: The control module controls the execution module to perform regular cooling of the power battery for a first preset time; and the control module controls the execution module to perform regular heating of the power battery for a second preset time.

5. The method of thermal management of a power battery of claim 1, wherein: The first preset temperature is 35 degrees Celsius; the second preset temperature is 5 degrees Celsius; the third preset temperature is 30 degrees Celsius; and the fourth preset temperature is 20 degrees Celsius.

6. The method of thermal management of a power battery of claim 4, wherein: The first preset time is 20 minutes; and the second preset time is 15 minutes.

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