A temperature control method, system and electric vehicle for an electric vehicle

Abstract

The present invention discloses a temperature control method, system and electric vehicle for an electric vehicle. The temperature control method for the electric vehicle includes: obtaining an average current of a battery module within a first preset time period, where the first preset time period is the time period between the moment corresponding to the stop of the electric vehicle operation and the power-off moment of the electric vehicle control system; determining a current temperature of the battery module according to the average current of the battery module within the first preset time period; determining a second preset time period according to the current temperature and a target cooling temperature of the battery module, where the second preset time period is a cooling time period of the battery module; after cooling the battery module for the second preset time period according to the second preset time period, cutting off a power signal of a cooling module of the battery module. The technical solution provided by the embodiments of the present invention extends the cooling time of the battery module after the electric vehicle stops running.

Description

Technical Field

[0001] Embodiments of the present invention relate to the technical field of electric vehicles, and in particular, to a temperature control method, a system, and an electric vehicle for an electric vehicle. Background Art

[0002] As a new energy vehicle, electric vehicles have received extensive attention from all walks of life. Electric vehicles drive the vehicle by carrying a power battery. Therefore, the battery module is the energy source of the electric vehicle, and the performance of the battery module to a certain extent determines the overall performance of the electric vehicle.

[0003] When the battery cells in the battery module are in a high-temperature working condition for a long time, it will reduce the capacity of the battery cells themselves and increase the capacity attenuation rate, thus affecting the service life of the battery cells. Therefore, the thermal management of the battery cells becomes particularly important.

[0004] Currently, during the operation of an electric vehicle, the temperature of the battery cells is maintained within a certain temperature range through the vehicle's cooling system, so that the battery cells can charge and discharge relatively normally. However, when the vehicle stops running, the vehicle's cooling system will be turned off, and at this time, the battery cells will not be cooled by the cooling system, and the temperature of the battery cells will increase, which is not conducive to the service life of the battery cells. Summary of the Invention

[0005] In view of this, embodiments of the present invention provide a temperature control method, a system, and an electric vehicle for an electric vehicle, which extend the cooling time of the battery module after the electric vehicle stops running.

[0006] In a first aspect, embodiments of the present invention provide a temperature control method for an electric vehicle, including:

[0007] Obtain the average current of the battery module within a first preset duration, where the first preset duration is the duration between the moment corresponding to the electric vehicle stopping running and the moment when the electric vehicle control system powers off;

[0008] Determine the current temperature of the battery module according to the average current of the battery module within the first preset duration;

[0009] Determine a second preset duration according to the current temperature and the target cooling temperature of the battery module, where the second preset duration is the cooling duration of the battery module;

[0010] Cool the battery module according to the second preset duration, and after the second preset duration, cut off the power signal of the battery module cooling module.

[0011] Optionally, determining the current temperature of the battery module according to the average current of the battery module within the first preset duration includes:

[0012] Obtain the curve of the temperature of the battery module changing with the current;

[0013] Determine the current temperature of the battery module according to the curve of the temperature of the battery module changing with the current and the average current of the battery module within the first preset duration.

[0014] Optionally, determine a second preset duration according to the current temperature of the battery module and the target cooling temperature, where the second preset duration is the cooling duration of the battery module, including:

[0015] Obtain the curve of the temperature of the battery module changing with the cooling time of the battery cooling module;

[0016] Determine the second preset duration according to the current temperature of the battery module, the curve of the temperature of the battery module changing with the cooling time of the battery cooling module, and the target cooling temperature.

[0017] In a second aspect, the present invention provides a temperature control system for an electric vehicle, including: a battery module, a current acquisition module, a temperature determination module, a cooling time determination module, and a battery cooling module;

[0018] The first signal input end of the current acquisition module is electrically connected to the signal output end of the battery module, and the current acquisition module is used to obtain the average current of the battery module within the first preset duration, where the first preset duration is the duration between the moment corresponding to the stop of the electric vehicle operation and the power-off moment of the electric vehicle control system;

[0019] The signal input end of the temperature determination module is electrically connected to the signal output end of the current acquisition module, and the temperature determination module is used to determine the current temperature of the battery module according to the average current of the battery module within the first preset duration;

[0020] The signal input end of the cooling time determination module is electrically connected to the signal output end of the temperature determination module, and the cooling time determination module is used to determine a second preset duration according to the current temperature of the battery module and the target cooling temperature, where the second preset duration is the cooling duration of the battery module;

[0021] The signal input end of the battery module cooling module is electrically connected to the signal output end of the cooling time determination module, and the battery module cooling module is used to cool the battery module according to the second preset duration, and after the second preset duration, cut off the power signal of the battery module cooling module.

[0022] Optionally, the temperature determination module includes a first storage unit and a first processing unit. The first storage unit is configured to store a curve of the temperature of the battery module varying with current. A first signal input end of the first processing unit is electrically connected to a signal output end of the first storage unit, and a second signal input end of the first processing unit is electrically connected to a signal output end of the current acquisition module. The first processing unit is configured to determine the current temperature of the battery module according to the curve of the temperature of the battery module varying with current and the average current of the battery module within a first preset time period.

[0023] Optionally, the cooling time determination module includes a second storage unit and a second processing unit. The second storage unit is configured to store a curve of the temperature of the battery module varying with the cooling time of the battery cooling module. A first signal input end of the second processing unit is electrically connected to a signal output end of the second storage unit, and a second signal input end of the second processing unit is electrically connected to a signal output end of the temperature determination module. The second processing unit is configured to determine the second preset time period according to the current temperature of the battery module, the curve of the temperature of the battery module varying with the cooling time of the battery cooling module, and the target cooling temperature.

[0024] Optionally, the battery module cooling module includes a third processing unit and a power control unit. A signal input end of the third processing unit is electrically connected to a signal output end of the second processing unit. The third processing unit is configured to issue a power-down control signal according to the second preset time period. A signal input end of the power control unit is electrically connected to a signal output end of the third processing unit. The power control unit is configured to issue a control signal for cutting off the power signal of the battery module cooling module according to the power-down control signal.

[0025] Optionally, the battery module cooling module further includes a cooling device, a power supply, and a switch unit. A first end of the switch unit is electrically connected to an output end of the power supply, a second end of the switch unit is electrically connected to a power signal input end of the cooling device, and a control end of the switch unit is electrically connected to a signal output end of the power control unit.

[0026] Optionally, an automobile state detection module is further included. The automobile state detection module is configured to obtain state parameters of the electric vehicle. Among them, the state parameters of the electric vehicle include speed and / or acceleration.

[0027] The current acquisition module includes a second signal input end. The second signal input end of the current acquisition module is electrically connected to a signal output end of the automobile state detection module. The current acquisition module is configured to obtain the average current of the battery module from the moment corresponding to the stop of operation to the moment of power-down of the electric vehicle management system.

[0028] In a third aspect, an embodiment of the present invention provides an electric vehicle, including the temperature control system of the electric vehicle described in any of the second aspects.

[0029] In this embodiment, the current temperature of the battery module determined according to the average current within the duration from the moment when the electric vehicle stops running to the moment when the electric vehicle control system shuts down has high accuracy and is closer to the actual temperature of the battery module. According to the current temperature of the battery module and the target cooling temperature, the determined second preset duration is the cooling duration of the battery module, that is, after the electric vehicle stops running, according to the second preset duration, the battery module is cooled for the second preset duration, and then the power signal of the battery module cooling module is cut off to stop cooling the battery module. Compared with the technical solution in the prior art, after the electric vehicle stops running, the battery module is no longer cooled. In the technical solution of this embodiment, after the electric vehicle stops running, the cooling time of the battery module is extended, thereby quickly reducing the temperature of the battery module and extending the service life of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a flowchart of a temperature control method for an electric vehicle provided by an embodiment of the present invention;

[0031] Figure 2 is Figure 1 a flowchart included in step 120 in;

[0032] Figure 3 is Figure 1 a flowchart included in step 130 in;

[0033] Figure 4 It is a schematic structural diagram of a temperature control system for an electric vehicle provided by an embodiment of the present invention;

[0034] Figure 5 It is a schematic structural diagram of another temperature control system for an electric vehicle provided by an embodiment of the present invention;

[0035] Figure 6 It is a schematic structural diagram of yet another temperature control system for an electric vehicle provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining the present invention, rather than limiting the present invention. Additionally, it should be noted that for the sake of description, only parts related to the present invention rather than all structures are shown in the drawings.

[0037] As described in the above background art, during the operation of an electric vehicle, the temperature of the battery cells is maintained within a certain temperature range through the vehicle's cooling system, enabling the battery cells to charge and discharge relatively normally. However, when the vehicle stops running, the vehicle's cooling system shuts down, and at this time, the battery cells are not cooled by the cooling system, resulting in an increase in the temperature of the battery cells, which is not conducive to the service life of the battery cells.

[0038] In view of the above technical problems, the embodiments of the present invention provide the following technical solutions:

[0039] Figure 1 It is a flowchart of a temperature control method for an electric vehicle provided by an embodiment of the present invention. Refer to Figure 1 and the method includes the following steps:

[0040] Step 110: Obtain the average current of the battery module within a first preset duration, where the first preset duration is the duration between the moment when the electric vehicle stops running and the moment when the electric vehicle control system powers off.

[0041] Specifically, when the speed and acceleration of the electric vehicle are zero, it is the moment when the electric vehicle stops running. The moment when the electric vehicle control system powers off is the moment when the power system of the electric vehicle no longer provides power.

[0042] Step 120: Determine the current temperature of the battery module according to the average current of the battery module within the first preset duration.

[0043] Step 130: Determine a second preset duration according to the current temperature of the battery module and the target cooling temperature, where the second preset duration is the cooling duration of the battery module.

[0044] Step 140: After cooling the battery module for the second preset duration according to the second preset duration, cut off the power signal of the battery module cooling module.

[0045] In this embodiment, the current temperature of the battery module determined according to the average current within the duration between the moment when the electric vehicle stops running and the moment when the electric vehicle control system powers off has high accuracy and is closer to the actual temperature of the battery module. According to the current temperature of the battery module and the target cooling temperature, the determined second preset duration is the cooling duration of the battery module, that is, after the electric vehicle stops running, according to the second preset duration, the battery module is cooled for the second preset duration before the power signal of the battery module cooling module is cut off to stop cooling the battery module. Compared with the technical solutions in the prior art, where the battery module is no longer cooled after the electric vehicle stops running, the technical solution in this embodiment extends the cooling time of the battery module after the electric vehicle stops running, thereby quickly reducing the temperature of the battery module and extending the service life of the battery module.

[0046] Optionally, based on the above technical solution, when cooling the battery module according to the second preset duration, the power signal of the battery module cooling module can be provided by a power source different from that of the battery module. Specifically, it can be a storage battery, or it can be the mains power when the electric vehicle is in a charging state.

[0047] Figure 2 For Figure 1 The flowchart included in step 120 of

[0048] Step 1201: Obtain the curve of the temperature of the battery module varying with the current.

[0049] Step 1202: Determine the current temperature of the battery module according to the curve of the temperature of the battery module varying with the current and the average current within the first preset duration of the battery module.

[0050] In this embodiment, the curve of the temperature of the battery module varying with the current can be drawn by recording the temperatures corresponding to different currents of the battery module. Therefore, according to the curve of the temperature of the battery module varying with the current and the average current within the first preset duration of the battery module, the current temperature of the battery module can be accurately determined.

[0051] Figure 3 For Figure 1 The flowchart included in step 130 of Figure 3 Referring to

[0052] Step 1301: Obtain the curve of the temperature of the battery module varying with the cooling time of the battery cooling module.

[0053] Step 1302: Determine the second preset duration according to the current temperature of the battery module, the curve of the temperature of the battery module varying with the cooling time of the battery cooling module, and the target cooling temperature.

[0054] In this embodiment, the curve of the temperature of the battery module varying with the cooling time of the battery cooling module can be drawn by recording the differences between different current temperatures of the battery module and the target cooling temperature and the cooling time. Therefore, according to the current temperature of the battery module, the curve of the temperature of the battery module varying with the cooling time of the battery cooling module, and the target cooling temperature, the second preset duration can be accurately determined.

[0055] Figure 4The figure is a schematic structural diagram of a temperature control system for an electric vehicle provided by an embodiment of the present invention. Refer to Figure 4 , the temperature control system of the electric vehicle includes: a battery module 100, a current acquisition module 200, a temperature determination module 300, a cooling time determination module 400, and a battery cooling module 500; a first signal input terminal 200A of the current acquisition module 200 is electrically connected to a signal output terminal 100A of the battery module 100, and the current acquisition module 200 is configured to obtain the average current of the battery module 100 within a first preset duration, where the first preset duration is the duration between the moment corresponding to the stop of the electric vehicle operation and the power-off moment of the electric vehicle control system; a signal input terminal 300A of the temperature determination module 300 is electrically connected to a signal output terminal 200B of the current acquisition module 200, and the temperature determination module 300 is configured to determine the current temperature of the battery module 100 according to the average current of the battery module 100 within the first preset duration; a signal input terminal 400A of the cooling time determination module 400 is electrically connected to a signal output terminal 300B of the temperature determination module 300, and the cooling time determination module 400 is configured to determine a second preset duration according to the current temperature of the battery module 100 and a target cooling temperature, where the second preset duration is the cooling duration of the battery module; a signal input terminal 500A of the battery module cooling module 500 is electrically connected to a signal output terminal 400B of the cooling time determination module 400, and the battery module cooling module 500 is configured to cool the battery module 100 according to the second preset duration, and after cooling for the second preset duration, cut off the power signal of the battery module cooling module 500.

[0056] In this embodiment, the current temperature of the battery module 100 determined by the temperature determination module 300 according to the average current within the duration between the moment corresponding to the stop of the electric vehicle operation and the power-off moment of the electric vehicle control system is the actual temperature of the battery module 100. And the second preset duration determined by the cooling time determination module 400 according to the current temperature of the battery module 100 and the target cooling temperature is the cooling duration of the battery module, that is, after the electric vehicle stops running, the battery module cooling module 500 cools the battery module 100 according to the second preset duration, and only after cooling for the second preset duration, will it cut off the power signal of the battery module cooling module 500 and stop cooling the battery module 100. Compared with the technical solution in the prior art, after the electric vehicle stops running, the cooling of the battery module 100 is no longer carried out. In the technical solution of this embodiment, after the electric vehicle stops running, the cooling time of the battery module 100 is extended, thereby quickly reducing the temperature of the battery module 100 and extending the service life of the battery module 100.

[0057] Figure 5 The figure is a schematic structural diagram of another temperature control system for an electric vehicle provided by an embodiment of the present invention. Figure 6Schematic diagram of the structure of another temperature control system for an electric vehicle provided by an embodiment of the present invention.

[0058] Optionally, based on the above technical solution, refer to Figure 5 and Figure 6 The temperature determination module 300 includes a first storage unit 301 and a first processing unit 302. The first storage unit 301 is used to store the curve of the temperature of the battery module 100 changing with current. The first signal input terminal 302A of the first processing unit 302 is electrically connected to the signal output terminal 301A of the first storage unit 301, and the second signal input terminal 302B of the first processing unit 302 is electrically connected to the signal output terminal 200B of the current acquisition module 200. The first processing unit 302 is used to determine the current temperature of the battery module 100 according to the curve of the temperature of the battery module 100 changing with current and the average current of the battery module 100 within a first preset time period.

[0059] In this embodiment, the curve of the temperature of the battery module 100 changing with current can be drawn by recording the temperatures corresponding to different currents of the battery module 100. Therefore, the first processing unit 302 can accurately determine the current temperature of the battery module 100 according to the curve of the temperature of the battery module 100 changing with current and the average current of the battery module 100 within a first preset time period. Among them, the first processing unit 302 can be a microprocessing unit. The first storage unit 301 can be a storage chip.

[0060] Based on the above technical solution, refer to Figure 5 and Figure 6 The cooling time determination module 400 includes a second storage unit 401 and a second processing unit 402. The second storage unit 401 is used to store the curve of the temperature of the battery module 100 changing with the cooling time of the battery cooling module. The first signal input terminal 402A of the second processing unit 402 is electrically connected to the signal output terminal 401A of the second storage unit 401, and the second signal input terminal 402B of the second processing unit 402 is electrically connected to the signal output terminal 300B of the temperature determination module 300. The second processing unit 402 is used to determine a second preset time period according to the current temperature of the battery module 100, the curve of the temperature of the battery module 100 changing with the cooling time of the battery cooling module, and the target cooling temperature.

[0061] In this embodiment, the difference between the different current temperatures of the battery module 100 and the target cooling temperature and the cooling time can be recorded to plot the curve of the temperature of the battery module 100 changing with the cooling time of the battery cooling module. Therefore, the second processing unit 402 can accurately determine the second preset duration according to the current temperature of the battery module 100, the curve of the temperature of the battery module 100 changing with the cooling time of the battery cooling module, and the target cooling temperature. Among them, the second processing unit 402 can be a microprocessing unit. The second storage unit 401 can be a storage chip.

[0062] Based on the above technical solution, refer to Figure 5 and Figure 6 The battery module cooling module 500 includes a third processing unit 501 and a power control unit 502. The signal input terminal 501A of the third processing unit 501 is electrically connected to the signal output terminal 402C of the second processing unit 402. The third processing unit 501 is configured to send a power-off control signal according to the second preset duration. The signal input terminal 502A of the power control unit 502 is electrically connected to the signal output terminal 501B of the third processing unit 501. The power control unit 502 is configured to send a control signal for cutting off the power signal of the battery module cooling module according to the power-off control signal.

[0063] The third processing unit 501 can be a microprocessing unit. The power control unit 502 can be a microprocessing unit. Specifically, the third processing unit 501 sends a power-off control signal according to the second preset duration, and the power control unit 502 sends a control signal for cutting off the power signal of the battery module cooling module according to the power-off control signal, so as to cut off the power signal of the battery module cooling module after the second preset duration after the electric vehicle stops running, thereby extending the cooling time of the battery module 100, quickly reducing the temperature of the battery module 100, and extending the service life of the battery module 100.

[0064] Based on the above technical solution, refer to Figure 5 and Figure 6 The battery module cooling module further includes a cooling device 503, a power supply 504, and a switch unit 505. The first end 505A of the switch unit 505 is electrically connected to the output terminal 504A of the power supply 504. The second end 505B of the switch unit 505 is electrically connected to the power signal input terminal 503A of the cooling device 503. The control end 505C of the switch unit 505 is electrically connected to the signal output terminal 502B of the power control unit 502. The power control unit 502 is configured to control the switch unit 505 to be cut off according to the control signal for cutting off the power signal of the battery module cooling module.

[0065] Specifically, the power control unit 502 controls the switch unit 505 to cut off according to a control signal for cutting off the power signal of the battery module cooling module, the power supply 504 stops providing a power signal to the cooling device 503, and the cooling device 503 stops cooling the battery module 100, so as to stop cooling the battery module 100 after a second preset duration after the electric vehicle stops running, thereby extending the cooling time of the battery module 100, quickly reducing the temperature of the battery module 100, and extending the service life of the battery module 100.

[0066] Next, the timing for the current acquisition module 200 to acquire the average current of the battery module 100 within the first preset duration will be specifically introduced.

[0067] See Figure 2 , the temperature control system of the electric vehicle further includes a vehicle state detection module 600. The vehicle state detection module 600 is used to acquire the state parameters of the electric vehicle. Among them, the state parameters of the electric vehicle include speed and / or acceleration; the current acquisition module 200 includes a second signal input terminal 200C. The second signal input terminal 200C of the current acquisition module 200 is electrically connected to the signal output terminal 600A of the vehicle state detection module 600. The current acquisition module 200 is used to acquire the average current of the battery module 100 from the moment corresponding to the stop of operation to the moment when the electric vehicle management system shuts down.

[0068] Specifically, when the speed and acceleration of the electric vehicle are zero, it is the moment when the electric vehicle is in a stopped state. The moment when the electric vehicle control system shuts down is the moment when the power supply system of the electric vehicle no longer provides power. The duration from the moment corresponding to the stop of operation of the electric vehicle to the moment when the electric vehicle control system shuts down is the first preset duration. The current acquisition module 200 learns from the vehicle state detection module 600 the moment when the electric vehicle is in a stopped state, and then acquires the average current of the battery module 100 within the first preset duration, so as to enable the temperature determination module 300 to determine the current temperature of the battery module 100 based on the average current within the duration from the moment corresponding to the stop of operation of the electric vehicle to the moment when the electric vehicle control system shuts down as the actual temperature of the battery module 100.

[0069] Based on the above technical solution, see Figure 5 , the vehicle state detection module 600 includes an acceleration sensor 601 and a speed sensor 602. The signal output terminal of the acceleration sensor is electrically connected to the second signal input terminal 200C of the current acquisition module 200, and the signal output terminal of the speed sensor 602 is electrically connected to the second signal input terminal 200C of the current acquisition module 200.

[0070] Specifically, the acceleration sensor 601 is used to detect the acceleration of the electric vehicle, and the speed sensor 602 is used to detect the speed of the electric vehicle.

[0071] Alternatively, based on the above technical solution, refer to Figure 6 , the communication end 200D of the current acquisition module 200 is communicatively connected to the communication end of the electric vehicle control system 700, and is used to obtain the state parameters of the electric vehicle from the electric vehicle control system 700, where the state parameters of the electric vehicle include speed and / or acceleration.

[0072] The electric vehicle control system 700 can obtain the acceleration and speed of the electric vehicle by accessing the speed sensor and acceleration sensor inside the electric vehicle. Furthermore, the current acquisition module 200 can obtain the acceleration and speed of the electric vehicle from the electric vehicle control system 700, so as to enable the current acquisition module 200 to know the moment when the electric vehicle stops running, and obtain the average current of the battery module 100 within the first preset duration. Furthermore, the temperature determination module 300 determines the current temperature of the battery module 100 as the actual temperature of the battery module 100 based on the average current within the duration from the moment corresponding to the electric vehicle's stop operation to the power-off moment of the electric vehicle control system.

[0073] The embodiment of the present invention also provides an electric vehicle, including the temperature control system of the electric vehicle described in any of the above technologies. The technical effects of the electric vehicle provided in this embodiment are similar to those of the above embodiments, and will not be elaborated here.

[0074] Note that the above is only the preferred embodiment of the present invention and the applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here, and various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments only. Without departing from the concept of the present invention, it may also include more other equivalent embodiments, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A temperature control method for an electric vehicle, characterized in that, it includes: Obtain the average current of the battery module within a first preset duration, where the first preset duration is the duration between the moment when the electric vehicle stops running and the moment when the electric vehicle control system shuts down; Determine the current temperature of the battery module according to the average current of the battery module within the first preset duration; Determine a second preset duration according to the current temperature of the battery module and the target cooling temperature, where the second preset duration is the cooling duration of the battery module; Cool the battery module according to the second preset duration, and after cooling for the second preset duration, cut off the power signal of the battery module cooling module; Determining the current temperature of the battery module according to the average current of the battery module within the first preset duration includes: Obtain the curve of the temperature of the battery module changing with current; Determine the current temperature of the battery module according to the curve of the temperature of the battery module changing with current and the average current of the battery module within the first preset duration.

2. The temperature control method for an electric vehicle according to claim 1, characterized in that, Determining the second preset duration according to the current temperature of the battery module and the target cooling temperature, where the second preset duration is the cooling duration of the battery module includes: Obtain the curve of the temperature of the battery module changing with the cooling time of the battery cooling module; Determine the second preset duration according to the current temperature of the battery module, the curve of the temperature of the battery module changing with the cooling time of the battery cooling module, and the target cooling temperature.

3. A temperature control system for an electric vehicle, which is controlled by using the temperature control method for an electric vehicle according to any one of claims 1-2, characterized in that, it includes: A battery module, a current acquisition module, a temperature determination module, a cooling time determination module, and a battery cooling module; The first signal input end of the current acquisition module is electrically connected to the signal output end of the battery module, and the current acquisition module is used to obtain the average current of the battery module within a first preset duration, where the first preset duration is the duration between the moment when the electric vehicle stops running and the moment when the electric vehicle control system shuts down; The signal input end of the temperature determination module is electrically connected to the signal output end of the current acquisition module, and the temperature determination module is used to determine the current temperature of the battery module according to the average current of the battery module within the first preset duration; The signal input end of the cooling time determination module is electrically connected to the signal output end of the temperature determination module, and the cooling time determination module is used to determine a second preset duration according to the current temperature of the battery module and the target cooling temperature, where the second preset duration is the cooling duration of the battery module; The signal input end of the battery module cooling module is electrically connected to the signal output end of the cooling time determination module, and the battery module cooling module is used to cool the battery module according to the second preset duration, and after cooling for the second preset duration, cut off the power signal of the battery module cooling module.

4. The temperature control system of an electric vehicle according to claim 3, wherein, the temperature determination module includes a first storage unit and a first processing unit. The first storage unit is used to store the curve of the temperature of the battery module changing with the current. The first signal input end of the first processing unit is electrically connected to the signal output end of the first storage unit, and the second signal input end of the first processing unit is electrically connected to the signal output end of the current acquisition module. The first processing unit is used to determine the current temperature of the battery module according to the curve of the temperature of the battery module changing with the current and the average current of the battery module within a first preset time period.

5. The temperature control system of an electric vehicle according to claim 3, wherein, the cooling time determination module includes a second storage unit and a second processing unit. The second storage unit is used to store the curve of the temperature of the battery module changing with the cooling time of the battery cooling module. The first signal input end of the second processing unit is electrically connected to the signal output end of the second storage unit, and the second signal input end of the second processing unit is electrically connected to the signal output end of the temperature determination module. The second processing unit is used to determine the second preset time period according to the current temperature of the battery module, the curve of the temperature of the battery module changing with the cooling time of the battery cooling module, and the target cooling temperature.

6. The temperature control system of an electric vehicle according to claim 5, wherein, the battery module cooling module includes a third processing unit and a power control unit. The signal input end of the third processing unit is electrically connected to the signal output end of the second processing unit. The third processing unit is used to send a power-off control signal according to the second preset time period. The signal input end of the power control unit is electrically connected to the signal output end of the third processing unit. The power control unit is used to send a control signal for cutting off the power signal of the battery module cooling module according to the power-off control signal.

7. The temperature control system of an electric vehicle according to claim 5, wherein, the battery module cooling module further includes a cooling device, a power supply, and a switch unit. The first end of the switch unit is electrically connected to the output end of the power supply, the second end of the switch unit is electrically connected to the power signal input end of the cooling device, and the control end of the switch unit is electrically connected to the signal output end of the power control unit.

8. The temperature control system of an electric vehicle according to claim 3, wherein, it further includes a vehicle state detection module. The vehicle state detection module is used to obtain the state parameters of the electric vehicle. Among them, the state parameters of the electric vehicle include speed and / or acceleration; the current acquisition module includes a second signal input end. The second signal input end of the current acquisition module is electrically connected to the signal output end of the vehicle state detection module. The current acquisition module is used to obtain the average current of the battery module from the moment corresponding to the stop of operation to the moment of power-off of the electric vehicle management system.

9. An electric vehicle, It is characterized in that It includes the temperature control system of the electric vehicle according to any one of claims 3-8.

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