Heat management system and heat management method of power battery

Abstract

The invention discloses a heat management system and a heat management method of a power battery, and belongs to the technical field of new energy automobiles, the system comprises a data acquisition module, a control module and an execution module, the input end of the control module is connected with the output end of the data acquisition module; the output end of the control module is connected with the input end of the execution module. The method comprises the steps that the size relation between the temperature of a power battery and a first preset temperature, a second preset temperature, a third preset temperature and a fourth preset temperature is judged through a control module, the size relation between the vehicle speed and a preset speed threshold value is judged through the control module, and whether the vehicle is in a charging state or not is judged through the control module; and the control module controls the execution module to perform enhanced cooling, conventional cooling, enhanced heating or conventional heating on the power battery according to the judgment result, so that the temperature of the power battery is adjusted.

Description

Technical Field

[0001] The present invention 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 Art

[0002] The endurance of new energy vehicles has always been a point of great concern to users. In the process of developing new models, how to reduce energy consumption is an unavoidable topic. The thermal management of new energy vehicles not only affects energy consumption, but also plays a vital role in the safety of power batteries. However, the thermal management strategy of the entire vehicle cannot be defined to operate intelligently according to the power battery status and the energy consumption is high.

[0003] Patent CN108819657B discloses a refrigeration control method for a new energy vehicle, the method comprising the following steps: (a) determining whether the refrigeration switches of the HVAC and the battery are in the on state; (b) when the refrigeration switch of the HVAC is in the on state, executing steps (c) to (f); when the refrigeration switch of the HVAC is in the off state, executing steps (g) to (i); (c) determining the initial speed of the compressor according to the speeds 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 blower air volume switch setting; (e) obtaining the second corrected speed of the compressor by means of P compensation and I 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 speeds corresponding to the ambient temperature and the collected battery core temperature; (h) obtaining the second corrected speed of the compressor by means of P compensation and I compensation; (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 of the invention

[0005] The technical problem to be solved by the present invention is to provide a thermal management system and a thermal management method for a power battery in view of the deficiencies in the prior art, so as 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 object, the technical solution adopted by the present invention is:

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

[0008] Furthermore, the data acquisition module includes a temperature sensor, an ambient temperature sensor, a flow sensor and a pressure sensor, and the input end of the control module is respectively connected to 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.

[0009] Furthermore, the execution module includes 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] Furthermore, the temperature sensor collects temperature data of the power battery and inputs it into the control module; the ambient temperature sensor collects ambient temperature data and inputs it into the control module; the flow sensor collects liquid flow data in the circulating water pump and inputs it into the control module; the pressure sensor collects refrigerant pressure data and inputs it into the control module.

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

[0012] The present invention also provides a heat management method for a power battery, the method comprising the following steps:

[0013] S1: The control module determines whether the temperature of the power battery is greater than a first preset temperature. If not, the control module enters S2. If yes, the control module enters S4.

[0014] S2: The control module determines whether the temperature of the power battery is lower than the second preset temperature. If not, the process proceeds to S3. If yes, the process proceeds to S9.

[0015] S3: The control module determines whether the vehicle speed is greater than a preset speed threshold. If so, the control module enters S5. If not, the control module enters a thermal management mode and enters S1.

[0016] S4: The control module determines whether the vehicle is in a charging state. If so, it enters S5; if not, it enters S6;

[0017] S5: The control module controls the execution module to enhance cooling of the power battery; then enter S7;

[0018] S6: The control module controls the execution module to perform conventional cooling on the power battery; then enter S8;

[0019] S7: The control module determines whether the temperature of the power battery is not greater than the third preset temperature. If so, the process proceeds to S8; if not, the process proceeds to S5;

[0020] S8: The control module controls the execution module to stop cooling the power battery; and the process proceeds to S20;

[0021] S9: The control module determines whether the vehicle is in a charging state. If so, it proceeds to S10; if not, it proceeds to S11;

[0022] S10: The control module controls the execution module to enhance the heating of the power battery; enter S12;

[0023] S11: The control module controls the execution module to perform conventional heating on the power battery; then enters S13;

[0024] S12: The control module determines whether the temperature of the power battery is not less than a fourth preset temperature. If so, the process proceeds to S13; if not, the process proceeds to S10;

[0025] S13: The control module controls the execution module to stop heating the power battery; and the process proceeds to S20;

[0026] S20: End.

[0027] Furthermore, 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 control module controls the execution module to perform conventional cooling of the power battery for a first preset time; and the control module controls the execution module to perform conventional heating of the power battery for a second preset time.

[0029] Furthermore, 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] Furthermore, the first preset time is 20 minutes; the second preset time is 15 minutes.

[0031] The thermal management system and thermal management method of the power battery of the present invention have the following advantages:

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

[0033] (2) Through the thermal management system and thermal management method of the power battery of the present invention, refined and intelligent control of the thermal management of the power battery can be achieved.

[0034] (3) Through the thermal management system and thermal management method of the power battery of the present invention, the temperature of the power battery can be adjusted according to the driving speed of the vehicle.

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

[0036] (5) In the present invention, 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 ambient temperature, which helps to reduce unnecessary energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] This specification includes the following drawings, which show the following contents:

[0038] Figure 1 It is a logical structure block diagram of a thermal management system of a power battery of the present invention;

[0039] Figure 2 It is a flow chart of a heat management method for a power battery of the present invention.

[0040] Explanation of the accompanying drawings: 1. Data acquisition module; 2. Control module; 3. Execution module. DETAILED DESCRIPTION

[0041] The specific implementation methods of the present invention are further explained in detail below by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention and facilitating their implementation.

[0042] Figure 1 It is a logical structure block diagram of a thermal management system of a power battery of the present invention, including a data acquisition module 1, a control module 2 and an execution module 3, wherein the input end of the control module 2 is connected to the output end of the data acquisition module 1; the output end of the control module 2 is connected to the input end of the execution module 3.

[0043] Among them, the data acquisition module 1 includes a temperature sensor, an ambient temperature sensor, a flow sensor and a pressure sensor, and the input end of the control module 1 is respectively connected to 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; the control module 2 can adopt a microcontroller (MCU); the execution module 3 includes 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.

[0044] In addition, the temperature sensor collects the temperature data of the power battery and inputs it into the control module 2; the ambient temperature sensor collects the ambient temperature data and inputs it into the control module 2; the flow sensor collects the liquid flow data in the circulating water pump and inputs it into the control module 2; the pressure sensor collects the refrigerant pressure data and inputs it into 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 invention can adjust the temperature of the power battery according to the temperature of the power battery.

[0045] Figure 2 The present invention is a flowchart of a method for heat management of a power battery, the method comprising the following steps:

[0046] S1: Control module 2 determines whether the temperature of the power battery is greater than the first preset temperature. If not, it enters S2. If yes, it enters S4. Figure 2 In S1, specifically, after the temperature sensor feeds back the collected temperature of the power battery to the control module 2, the control module 2 determines whether the temperature of the power battery is greater than the first preset temperature. If the control module 2 determines that the temperature of the power battery is not greater than the first preset temperature, it enters S2; if the control module 2 determines that the temperature of the power battery is greater than the first preset temperature, it enters S4.

[0047] Among them, the first preset temperature is 35 degrees Celsius.

[0048] S2: Control module 2 determines whether the temperature of the power battery is lower than the second preset temperature. If not, it enters S3. If yes, it enters S9. Figure 2 In S2, specifically, after the control module 2 determines in S1 that the temperature of the power battery is not greater than the first preset temperature, the control module 2 will determine whether the temperature of the power battery is less than the second preset temperature. If the control module 2 determines that the temperature of the power battery is not less than the second preset temperature, it enters S3; if the control module 2 determines that the temperature of the power battery is less than the second preset temperature, it enters S9.

[0049] Among them, the second preset temperature is 5 degrees Celsius.

[0050] S3: The control module 2 determines whether the vehicle speed is greater than a preset speed threshold. If so, it enters S5. If not, the control module 2 enters the heat management mode and enters S1. Figure 2In S3, specifically, after S1 and S2, when the control module 2 determines that 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 will determine whether the vehicle speed at this time is greater than the preset speed threshold. If the control module 2 determines that the vehicle speed at this time is greater than the preset speed threshold, it enters S5. If the control module 2 determines that the vehicle speed at this time is not greater than the preset speed threshold, the control module 2 enters the thermal management mode and then enters S1.

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

[0052] In addition, when the control module 2 enters the thermal 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 will feed back the collected ambient temperature to the control module 2, and the control module 2 will determine whether the ambient temperature fed back by the ambient temperature sensor is not 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 not 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.

[0053] S4: The control module 2 determines whether the vehicle is in a charging state. If so, it enters S5, if not, it enters S6. Figure 2 In S4, specifically, in S1, after the control module 2 determines that the temperature of the power battery is greater than the first preset temperature, the control module 2 will determine whether the vehicle is in a charging state. If the control module 2 determines that the vehicle is in a charging state, it enters S5. If the control module 2 determines that the vehicle is not in a charging state, it enters S6.

[0054] The control module 2 determines whether the vehicle is in a charging state based on the vehicle controller (VCU) inputting information on whether the vehicle is in a charging state into the control module 2.

[0055] S5: Control module 2 controls execution module 3 to enhance cooling of the power battery; enter S7. Figure 2 In S5, specifically, when the control module 2 determines in S3 that the vehicle speed at this time is greater than the preset speed threshold, the control module 2 will control the circulating water pump, the cooling fan, and the compressor to enhance 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. At the same time, the temperature sensor will collect the temperature of the power battery in real time and feed it back to the control module 2, and enter S7; when the control module 2 determines in S4 that the vehicle is in a charging state, the control module 2 will control the circulating water pump, the cooling fan, and the compressor to enhance 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. At the same time, the temperature sensor will collect the temperature of the power battery in real time and feed it back to the control module 2, and enter S7.

[0056] Among them, enhanced cooling means that the control module 2 controls the circulating water pump, cooling fan, and compressor to be in the highest power consumption state, and works at the maximum cooling capacity state to ensure that the power battery temperature is quickly reduced to no more than the third preset temperature, and the circulating water pump, cooling fan, and compressor power are fully operated, with the power battery cooling rate as the highest priority. The third preset temperature is 30 degrees Celsius.

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

[0058] Among them, conventional cooling means that the control module 2 controls the circulating water pump, cooling fan, and compressor to be in a low power consumption state, and the power duty ratio of the circulating water pump, cooling fan, and compressor is automatically adjusted according to the power battery temperature and does not exceed 50%.

[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 the third preset temperature. If so, it proceeds to S8; if not, it proceeds to S5. Figure 2 S7 in the figure, specifically, in the process of enhancing cooling of the power battery by the circulating water pump, the cooling fan and the compressor in S5, the control module 2 will determine whether the temperature of the power battery fed back by the temperature sensor in real time is not greater than the third preset temperature. If so, it will enter S8, if not, it will enter S5.

[0061] Among them, 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; then enter S20. Figure 2 In S8, specifically, the control module 2 controls the circulating water pump, the cooling fan, and the compressor to stop cooling the power battery (including enhanced cooling and conventional cooling), and enters S20.

[0063] S9: The control module 2 determines whether the vehicle is in a charging state. If so, it enters S10, if not, it enters S11. Figure 2 S9 in the figure, specifically, after the control module 2 determines in S2 that the temperature of the power battery is lower than the second preset temperature, the control module 2 determines whether the vehicle is in a charging state. If the control module 2 determines that the vehicle is in a charging state, the process enters S10. If the control module 2 determines that the vehicle is not in a charging state, the process enters S11.

[0064] The control module 2 determines whether the vehicle is in a charging state based on the vehicle controller (VCU) inputting information on whether the vehicle is in a charging state into the control module 2.

[0065] S10: The control module 2 controls the execution module 3 to enhance the heating of the power battery; then enter S12. Figure 2 S10 in the figure, specifically, when the control module 2 determines in S9 that the vehicle is in a charging state, the control module 2 will control the circulating water pump and the positive temperature coefficient thermistor (PTC) heater to enhance 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. At the same time, the temperature sensor will collect the temperature of the power battery in real time and feed it back to the control module 2, and enter S12.

[0066] Among them, enhanced heating means that the control module 2 controls the circulating water pump and the positive temperature coefficient thermistor (PTC) heater to be in full power consumption state, work at the maximum heating capacity, quickly raise the power battery temperature to no less than the fourth preset temperature, and take the power battery temperature rise rate as the highest priority. The fourth preset temperature is 20 degrees Celsius.

[0067] S11: The control module 2 controls the execution module 3 to perform conventional heating on the power battery; enter S13, wherein the control module 2 controls the execution module 3 to perform conventional heating on the power battery for a second preset time. Figure 2 S11 in, specifically, when the control module 2 determines in S9 that the vehicle is not in a charging state, the control module 2 will control the circulating water pump and the positive temperature coefficient thermistor (PTC) heater to perform conventional 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 will collect the temperature of the power battery in real time and feed it back to the control module 2, and the control module 2 controls the circulating water pump and the positive temperature coefficient thermistor (PTC) heater to perform conventional heating on the power battery for a second preset time, and enters S13.

[0068] Among them, conventional heating means that the control module 2 controls the circulating water pump and the positive temperature coefficient thermistor (PTC) heater to be in a low power consumption state, and the power duty cycle of the circulating water pump and the positive temperature coefficient thermistor (PTC) heater is automatically adjusted according to the power battery temperature and does not exceed 50%.

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

[0070] S12: The control module 2 determines whether the temperature of the power battery is not less than the fourth preset temperature. If so, it enters S13; if not, it enters S10. Figure 2 S12 in the figure, specifically, in the process of enhancing the heating of the power battery by the circulating water pump and the positive temperature coefficient thermistor (PTC) heater in S10, the control module 2 will determine 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 so, it will enter S13, if not, it will enter S10.

[0071] Among them, the fourth preset temperature is 20 degrees Celsius.

[0072] S13: The control module 2 controls the execution module 3 to stop heating the power battery; then enter S20. Figure 2 In S13, specifically, the control module 2 controls the circulating water pump and the positive temperature coefficient thermistor (PTC) heater to stop heating the power battery (including enhanced heating and conventional heating), and enters S20.

[0073] S20: End. Figure 2 The S20 in the.

[0074] The above system and method can realize refined and intelligent control of power battery thermal management.

[0075] Functions and Effects of the Embodiments

[0076] The temperature sensor collects the temperature data of the power battery and inputs it into the control module 2; the ambient temperature sensor collects the ambient temperature data and inputs it into the control module 2; the flow sensor collects the liquid flow data in the circulating water pump and inputs it into the control module 2; the pressure sensor collects the refrigerant pressure data and inputs it into 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 invention can adjust the temperature of the power battery according to the temperature of the power battery.

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

[0078] The control module 2 will determine whether the vehicle speed at this time is greater than the preset speed threshold. If so, the control module 2 will control the circulating water pump, cooling fan, and compressor to enhance the cooling of the power battery, that is, it can adjust the temperature of the power battery according to the vehicle's driving speed. If not, the control module enters the thermal management mode, and 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, and the control module 2 will determine whether the ambient temperature fed back by the ambient temperature sensor is not 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 not 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 determines in S4 that the vehicle is in a charging state, the control module 2 will control the circulating water pump, the cooling fan, and the compressor to enhance 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 determines in S4 that the vehicle is not in a charging state, the control module 2 will control the circulating water pump, the cooling fan, and the compressor to perform conventional cooling of 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 conventional cooling of the power battery is a first preset time, that is, the temperature of the power battery can be adjusted according to the charging state of the vehicle.

[0080] In S9, when the control module 2 determines that the vehicle is in a charging state, the control module 2 will control the circulating water pump and the positive temperature coefficient thermistor (PTC) heater to enhance 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; in S9, when the control module 2 determines that the vehicle is not in a charging state, the control module 2 will control the circulating water pump and the positive temperature coefficient thermistor (PTC) heater to perform conventional heating on the power battery, and the heating time for the control module 2 to control the circulating water pump and the positive temperature coefficient thermistor (PTC) heater to perform conventional heating on the power battery is a second preset time, that is, the temperature of the power battery can be adjusted according to the charging state of the vehicle, at the same time.

[0081] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A thermal management system for a power battery, characterized in that: It includes a data acquisition module, a control module and an execution module. The input end of the control module is connected to the output end of the data acquisition module; the output end of the control module is connected to the input end of the execution module.

2. A thermal management system for a power battery according to claim 1, characterized in that: The data acquisition module includes a temperature sensor, an ambient temperature sensor, a flow sensor and a pressure sensor, and the input end of the control module is respectively connected to 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.

3. A thermal management system for a power battery according to claim 1, characterized in that: The execution module includes 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.

4. A thermal management system for a power battery as claimed in claim 2, characterized in that: The temperature sensor collects temperature data of the power battery and inputs it into the control module; the ambient temperature sensor collects ambient temperature data and inputs it into the control module; the flow sensor collects liquid flow data in the circulating water pump and inputs it into the control module; the pressure sensor collects refrigerant pressure data and inputs it into the control module.

5. A thermal management system for a power battery as claimed in claim 4, characterized in that: 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.

6. A thermal management method for a power battery according to any one of claims 1 to 5, characterized in that: The method comprises the following steps: S1: The control module determines whether the temperature of the power battery is greater than a first preset temperature. If not, the control module enters S2. If yes, the control module enters S4. S2: The control module determines whether the temperature of the power battery is lower than the second preset temperature. If not, the process proceeds to S3. If yes, the process proceeds to S9. S3: The control module determines whether the vehicle speed is greater than a preset speed threshold. If so, the control module enters S5. If not, the control module enters a thermal management mode and enters S1. S4: The control module determines whether the vehicle is in a charging state. If so, it enters S5; if not, it enters S6; S5: The control module controls the execution module to enhance cooling of the power battery; then enter S7; S6: The control module controls the execution module to perform conventional cooling on the power battery; then enter S8; S7: The control module determines whether the temperature of the power battery is not greater than the third preset temperature. If so, the process proceeds to S8; if not, the process proceeds to S5; S8: The control module controls the execution module to stop cooling the power battery; and the process proceeds to S20; S9: The control module determines whether the vehicle is in a charging state. If so, it proceeds to S10; if not, it proceeds to S11; S10: The control module controls the execution module to enhance the heating of the power battery; enter S12; S11: The control module controls the execution module to perform conventional heating on the power battery; then enters S13; S12: The control module determines whether the temperature of the power battery is not less than a fourth preset temperature. If so, the process proceeds to S13; if not, the process proceeds to S10; S13: The control module controls the execution module to stop heating the power battery; and the process proceeds to S20; S20: End.

7. A method for thermal management of a power battery according to claim 6, characterized in that: 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.

8. A method for heat management of a power battery according to claim 6, characterized in that: The time during which the control module controls the execution module to perform normal cooling of the power battery is a first preset time; the time during which the control module controls the execution module to perform normal heating of the power battery is a second preset time.

9. A method for heat management of a power battery according to claim 6, characterized in that: 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.

10. A method for heat management of a power battery according to claim 8, characterized in that: The first preset time is 20 minutes; the second preset time is 15 minutes.

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