Power battery temperature control system and electric vehicle

Abstract

The present disclosure relates to a power battery temperature control system and an electric vehicle, and belongs to the technical field of new energy vehicles. The power battery temperature control system comprises a solar panel, an energy storage unit, a temperature detection unit and a temperature control unit, the temperature detection unit and the temperature control unit are electrically connected with the energy storage unit respectively; the solar panel is located outside the roof of the electric vehicle and connected with the roof; the energy storage unit is electrically connected with the solar panel and used for storing the electric energy generated by the solar panel; the temperature detection unit is electrically connected with the temperature control unit and used for detecting the temperature of the power battery and sending the temperature to the temperature control unit; the temperature control unit is used for determining the size of the temperature and a temperature threshold value, and heating the power battery when the temperature is less than a first temperature threshold value. By using the present disclosure, the endurance of the electric vehicle can be improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of new energy vehicles, and particularly relates to a power battery temperature control system and an electric vehicle. BACKGROUND

[0002] At present, most electric vehicles use lithium ion batteries as power batteries. The optimal working temperature of lithium ion batteries is about 25 DEG C. In a low temperature environment, the discharge capacity of lithium ion batteries decreases, and the performance decreases accordingly.

[0003] At present, a power battery temperature control system is usually arranged in an electric vehicle to control the temperature of the power battery and avoid performance degradation of the power battery.

[0004] However, the power battery temperature control system in the electric vehicle is usually powered by the power battery itself, which causes a burden on the endurance of the electric vehicle and leads to a decrease in the endurance of the electric vehicle. SUMMARY

[0005] The present disclosure provides a power battery temperature control system and an electric vehicle, which can solve the technical problems in the related art. The technical solutions are as follows.

[0006] In a first aspect, the present disclosure provides a power battery temperature control system, which comprises a solar cell panel, an energy storage unit, a temperature detection unit and a temperature control unit, wherein the temperature detection unit and the temperature control unit are electrically connected to the energy storage unit.

[0007] The solar cell panel is located outside a roof of the electric vehicle and connected to the roof.

[0008] The energy storage unit is electrically connected to the solar cell panel and is configured to store electric energy generated by the solar cell panel.

[0009] The temperature detection unit is electrically connected to the temperature control unit and is configured to detect the temperature of the power battery and send the temperature to the temperature control unit.

[0010] The temperature control unit is configured to determine the size of the temperature and a temperature threshold value, and heat the power battery when the temperature is less than a first temperature threshold value.

[0011] In a possible implementation, the first temperature threshold value is 20 DEG C.

[0012] In a possible implementation, the temperature control unit comprises a heating element and a controller.

[0013] The heating member is located at an outer ring of the power battery, and the heating member is electrically connected with the energy storage unit.

[0014] The controller is electrically connected with the heating member, and is configured to receive the temperature of the power battery sent by the temperature detection unit, determine the size of the temperature and a first temperature threshold, and control the heating member to heat in a case where the temperature is less than the first temperature threshold.

[0015] In a possible implementation, the temperature control unit further comprises a battery fan.

[0016] The air outlet of the battery fan is arranged opposite to the power battery.

[0017] The controller is electrically connected with the battery fan, and is further configured to determine the size of the temperature and a second temperature threshold, and control the battery fan to operate in a case where the temperature is greater than the second temperature threshold, the second temperature threshold being greater than the first temperature threshold.

[0018] In a possible implementation, the second temperature threshold is 40 DEG C.

[0019] In a possible implementation, the power battery temperature control system further comprises a direct current conversion circuit and a charging unit electrically connected.

[0020] The output end of the solar panel is electrically connected with the input end of the energy storage unit.

[0021] The input end of the direct current conversion circuit is electrically connected with the output end of the energy storage unit, and the output end of the direct current conversion circuit is electrically connected with the input end of the power battery.

[0022] The charging unit is electrically connected with the power battery and the direct current conversion circuit respectively, and is configured to: acquire a state of charge value of the power battery, determine the size of the state of charge value and an electric quantity threshold, and control the input end of the direct current conversion circuit and the output end of the direct current conversion circuit to be connected in communication in a case where the state of charge value is less than the electric quantity threshold.

[0023] In a possible implementation, the electric quantity threshold is 18%.

[0024] In a possible implementation, the solar panel comprises a plurality of panel units, the plurality of panel units are respectively located outside a roof of an electric vehicle, and are respectively connected with the roof.

[0025] In a possible implementation, the energy storage unit is a 12-volt direct current battery.

[0026] In a second aspect, the present disclosure provides an electric vehicle, the electric vehicle comprising the power battery temperature control system in the first aspect and possible implementation manners thereof.

[0027] The technical solutions provided by the embodiments of the present disclosure have at least the following beneficial effects:

[0028] The power battery temperature control system provided by the embodiments of the present disclosure can heat the power battery when the temperature of the power battery is less than the first temperature threshold, so that the power battery still has good performance in a low-temperature environment. In addition, the power battery temperature control system is provided with a solar cell panel and an energy storage unit, the energy storage unit stores the electric energy generated by the solar cell panel and provides electric energy for the temperature detection unit and the temperature control unit. The electric energy required by the entire power battery temperature control system during operation is converted from solar energy, which does not burden the endurance of the power battery, thereby improving the endurance of the electric vehicle.

[0029] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor.

[0031] Figure 1 is a structural schematic diagram of a power battery temperature control system according to an embodiment of the present disclosure;

[0032] Figure 2 is a structural schematic diagram of a power battery temperature control system according to an embodiment of the present disclosure;

[0033] Figure 3 is a structural schematic diagram of a power battery temperature control system according to an embodiment of the present disclosure;

[0034] Figure 4 is a structural schematic diagram of a power battery temperature control system according to an embodiment of the present disclosure;

[0035] Figure 5 is a structural schematic diagram of a solar cell panel according to an embodiment of the present disclosure;

[0036] Figure 6 is a structural schematic diagram of a power battery temperature control system according to an embodiment of the present disclosure.

[0037] Legend

[0038] 100, power battery; 101, input end of power battery;

[0039] 200, roof cover; 201, mounting through hole;

[0040] 1, solar panel; 11, panel monomer; 12, output end of solar panel;

[0041] 2, energy storage unit; 21, input end of energy storage unit; 22, output end of energy storage unit;

[0042] 3, temperature detection unit;

[0043] 4, temperature control unit;

[0044] 41, heating element; 42, controller; 43, battery fan;

[0045] 5, direct current conversion circuit; 51, input end of direct current conversion circuit; 52, output end of direct current conversion circuit;

[0046] 6, charging unit;

[0047] 7, rotating table body; 71, connecting through hole;

[0048] 8, jacking assembly;

[0049] 9, photoelectric sensor;

[0050] 10, solar light inclination angle detector. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical scheme and advantages of the present disclosure clearer, the present disclosure embodiments will be further described in detail below with reference to the drawings.

[0052] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” “third,” and similar terms used in this patent disclosure and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0053] Currently, lithium-ion batteries are widely used in electric vehicles due to their high energy density, good cycle life, and lightweight characteristics. The optimal operating temperature for lithium-ion batteries is around 25°C. At low temperatures, the mobility of lithium ions decreases, and the electrochemical activity declines, resulting in reduced discharge capacity and performance. To address this temperature issue and improve the performance of electric vehicles in low-temperature environments, electric vehicles typically incorporate a battery temperature control system. This system monitors the battery temperature and heats it when it falls below a set value, thus controlling the battery temperature and preventing performance degradation. However, current battery temperature control systems in electric vehicles are usually powered by the battery itself, which places a burden on the vehicle's range and leads to a reduction in driving range.

[0054] This disclosure provides a power battery temperature control system, such as... Figure 1 As shown, the power battery temperature control system includes a solar panel 1, an energy storage unit 2, a temperature detection unit 3, and a temperature control unit 4.

[0055] The temperature detection unit 3 and the temperature control unit 4 are electrically connected with the energy storage unit 2 respectively, the solar panel 1 is located outside the roof of the electric vehicle and connected with the roof, the energy storage unit 2 is electrically connected with the solar panel 1 for storing the electric energy generated by the solar panel 1, the temperature detection unit 3 is electrically connected with the temperature control unit 4 for detecting the temperature of the power battery 100 and sending the temperature to the temperature control unit 4, and the temperature control unit 4 is used for determining the size of the temperature and the temperature threshold value, and heating the power battery 100 in the case that the temperature is less than the first temperature threshold value.

[0056] Therefore, in the power battery temperature control system, the temperature detection unit 3 cooperates with the temperature control unit 4 to heat the power battery 100 in the case that the temperature of the power battery 100 is less than the first temperature threshold value, so that the power battery 100 still has good performance in a low temperature environment. In addition, the power battery temperature control system is provided with the solar panel 1 and the energy storage unit 2, the energy storage unit 2 stores the electric energy generated by the solar panel 1 and provides electric energy for the temperature detection unit 3 and the temperature control unit 4, and the electric energy required in the working process of the entire power battery temperature control system is converted from solar energy, so that the endurance of the power battery is not burdened, thereby improving the endurance of the electric vehicle.

[0057] Specifically, the temperature detection unit 3 can be a temperature sensor, which can be arranged in the interior of the power battery 100 or on the outer wall of the power battery 100. The number of the temperature sensor can be one or multiple, which is not limited in the embodiments of the present disclosure. In the case that the temperature detection unit 3 includes multiple temperature sensors, the temperature detection unit 3 can first determine the average value of the temperatures detected by the multiple temperature sensors, and take the average value as the temperature of the power battery 100 detected by the temperature detection unit 3.

[0058] In some possible embodiments, the first temperature threshold value is 20℃.

[0059] In the implementation, in the case that the power battery is a lithium ion battery, when the internal temperature of the power battery 100 is less than 20℃, the internal temperature of the power battery 100 gradually decreases, and the maximum discharge current of the battery also gradually decreases. According to the experimental data, when the internal temperature of the power battery 100 is 20℃, the maximum discharge current thereof is about 150A, when the internal temperature of the power battery 100 decreases to 0℃, the maximum discharge current thereof decreases to 40A accordingly, and when the internal temperature of the power battery 100 decreases to-40℃, the maximum discharge current thereof decreases to close to 0 accordingly.

[0060] It can be understood that the first temperature threshold value can be set by the technician according to the actual needs, which is not limited in the embodiments of the present disclosure.

[0061] In some possible embodiments, the temperature control unit 4 comprises a heating element 41 and a controller 42.

[0062] Referring to Figure 2 , the temperature control unit 4 comprises a heating element 41 and a controller 42, the heating element 41 is located on the outer wall of the power battery 100, and the heating element 41 and the controller 42 are electrically connected with the energy storage unit 2 respectively, and the controller 42 is electrically connected with the heating element 41.

[0063] The controller 42 is configured to receive the temperature of the power battery 100 sent by the temperature detection unit 3, determine the size of the temperature and a first temperature threshold, and control the heating element 41 to heat in a case that the temperature is less than the first temperature threshold.

[0064] In an example, the heating element 41 is a resistance wire coated with an insulating layer, the heating element 41 has a mesh structure, the heating element 41 is located on the outer wall of the power battery 100, and the heating element 41 is bonded with the power battery 100.

[0065] In implementation, the temperature control unit 4 comprises a driving circuit, a power supply end of the driving circuit is electrically connected with the energy storage unit 2, the heating element 41 is electrically connected with a load end of the driving circuit, and the controller 42 is configured to control the heating element 41 to be connected to the driving circuit in the case that the temperature is less than the first temperature threshold.

[0066] It can be understood that, in the case that the temperature is less than the first temperature threshold, the heating element 41 is not connected to the driving circuit, that is, the heating element 41 will not convert electrical energy into heat energy.

[0067] In an example, the temperature control unit 4 further comprises a battery fan 43.

[0068] Referring to Figure 3 , the air outlet of the battery fan 43 is arranged opposite to the power battery 100.

[0069] In implementation, the battery fan 43 is electrically connected with the energy storage unit 2 through the above-mentioned driving circuit, the controller 42 is configured to receive the temperature of the power battery 100 sent by the temperature detection unit 3, determine the size of the temperature and a second temperature threshold, and control the battery fan 43 to be connected to the driving circuit in a case that the temperature is greater than the second temperature threshold.

[0070] In this way, the power battery 100 can be cooled by the battery fan 43.

[0071] In an example, the second temperature threshold is 40℃.

[0072] In implementation, when the power battery is a lithium ion battery, according to experimental data, when the internal temperature of the power battery 100 is between 20℃ and 40℃, the maximum discharge current thereof is about 150A, and when the internal temperature of the power battery 100 is higher than 40℃, the internal temperature of the power battery 100 gradually increases, and the maximum discharge current of the battery gradually decreases, and when the internal temperature of the power battery 100 is 60℃, the maximum discharge current thereof correspondingly decreases to close to 0.

[0073] It can be understood that the second temperature threshold can be set by the technician according to actual needs, and the embodiments of the present disclosure are not limited thereto.

[0074] In an example, the air inlet of the battery fan 43 can be connected to the air outlet of the vehicle-mounted air conditioner through a pipeline. In this way, the cooling efficiency of the battery fan 43 can be improved.

[0075] In some possible embodiments, the power battery temperature control system can also supplement the power battery 100 with electric energy.

[0076] Referring to Figure 4 , the power battery temperature control system further comprises a direct current conversion circuit 5 and a charging unit 6 connected in an electrical manner.

[0077] The output end 12 of the solar cell panel 1 is electrically connected to the input end 21 of the energy storage unit 2, the input end 51 of the direct current conversion circuit 5 is electrically connected to the output end 22 of the energy storage unit 2, the output end 52 of the direct current conversion circuit 5 is electrically connected to the input end 101 of the power battery 100, and the charging unit 6 is electrically connected to the power battery 100 and the direct current conversion circuit 5 respectively.

[0078] In implementation, the charging unit 6 is electrically connected to the battery management system of the automobile, the charging unit 6 obtains the state of charge value of the power battery 100 from the battery management system, determines the size of the state of charge value and the charge threshold, and controls the input end 51 of the direct current conversion circuit 5 and the output end 52 of the direct current conversion circuit 5 to be connected in communication when the state of charge value is less than the charge threshold. After the input end 51 of the direct current conversion circuit 5 and the output end 52 of the direct current conversion circuit 5 are connected in communication, the energy storage unit 2 charges the power battery 100 through the direct current conversion circuit 5, thereby improving the endurance of the electric vehicle.

[0079] Exemplarily, the charge threshold can be 18%. The specific value of the charge threshold can be set by the technician according to actual needs, and the embodiments of the present disclosure are not limited thereto.

[0080] It can be understood that the energy storage unit 2 and the power battery 100 are only one-way conductive, that is, the electric energy can only flow from the energy storage unit 2 to the power battery 100, and cannot flow from the power battery 100 to the energy storage unit 2. Specifically, a diode can be arranged in the direct current conversion circuit 5, the positive electrode of the diode is electrically connected with the input end 51 of the direct current conversion circuit 5, and the negative electrode of the diode is electrically connected with the output end 52 of the direct current conversion circuit 5.

[0081] In an example, the power battery 100 includes a plurality of battery monomers, and the energy storage unit 2 is electrically connected with the plurality of battery monomers through the direct current conversion circuit 5. During the driving of the vehicle, at least one of the plurality of battery monomers does not output electric energy to the outside, and the energy storage unit 2 replenishes electric energy to the battery monomer which does not output electric energy to the outside through the direct current conversion circuit 5.

[0082] In an example, the energy storage unit 2 is a 12-volt direct current battery. In this way, the arrangement cost of the power battery temperature control system can be reduced.

[0083] In some possible embodiments, the solar panel 1 includes a plurality of panel monomers 11, and the plurality of panel monomers 11 are respectively located outside the roof of the electric vehicle and are respectively connected with the roof.

[0084] In implementation, each of the panel monomers 11 is electrically connected with the energy storage unit 2, and the energy storage unit 2 is used for respectively storing the electric energy generated by the plurality of panel monomers 11.

[0085] In this way, the efficiency of converting solar energy into electric energy can be improved, so that the endurance of the electric vehicle can be improved.

[0086] In an example, the power battery temperature control system further includes a plurality of rotating table bodies 7 and a plurality of photoelectric sensors 9.

[0087] Referring to Figure 6 , the upper wall of the roof cover 200 is provided with a plurality of mounting through holes 201, and the mounting through holes 201 are circular through holes. The rotating table body 7 has a cylindrical structure, and the plurality of rotating table bodies 7 are correspondingly arranged in different mounting through holes 201 and are rotationally connected with the roof cover 200. As shown in Figure 6 , the panel monomer 11 has a rectangular plate structure, and one edge of the panel monomer 11 is connected with the upper wall of the rotating table body 7.

[0088] In implementation, the power battery temperature control system further includes a driving assembly, the driving assembly is in transmission connection with the rotating table body 7, and the driving assembly is used for driving the rotating table body 7 to rotate around the first circumferential direction or the second circumferential direction, and the second circumferential direction is the direction of the first circumferential direction.

[0089] Specifically, the driving assembly can include a motor, a connecting rod and a plurality of transmission gears. The motor is electrically connected with the charging unit 6, the output shaft of the motor is in transmission connection with the connecting rod, the connecting rod is in transmission connection with the plurality of transmission gears respectively, and the plurality of transmission gears are connected with different rotating table bodies 7 respectively.

[0090] Further, the included angle between the solar panel monomer 11 and the rotating table body 7 can be 45°. The number of the photoelectric sensors 9 is 12, the 12 photoelectric sensors are evenly distributed on the edge of the roof 200 in a circumferential direction, and are electrically connected with the charging unit 6 respectively.

[0091] The charging unit 6 is used to determine the solar azimuth based on the size relationship of the light intensity values detected by the 12 photoelectric sensors 9, and determine the light beam irradiation deflection angle based on the solar azimuth and the current driving direction of the vehicle. The charging unit 6 is electrically connected with the driving assembly, and is used to control the rotating table body 7 to rotate a first angle relative to the driving direction of the vehicle through the driving assembly, the first angle is equal to the light beam irradiation deflection angle, so that the projection of the sunlight beam on the ground is perpendicular to the projection of the normal line of the solar panel monomer 11 on the ground.

[0092] In this way, the receiving efficiency of the solar energy by the solar panel 1 can be improved.

[0093] In an example, the charging unit 6 is used to determine the solar azimuth based on the size relationship of the light intensity values detected by the 12 photoelectric sensors 9, and determine the light beam irradiation deflection angle based on the solar azimuth and the current driving direction of the vehicle. The charging unit 6 is electrically connected with the driving assembly, and is used to control the rotating table body 7 to rotate a second angle relative to the driving direction of the vehicle through the driving assembly, the first angle is equal to half of the light beam irradiation deflection angle.

[0094] In this way, the receiving efficiency of the solar energy by the solar panel 1 can be improved as much as possible, and the wind resistance of the solar panel 1 can be reduced as much as possible, thereby reducing the energy consumption of the electric vehicle.

[0095] In an example, the photoelectric sensor 9 is electrically connected with the charging unit 6, and is used to detect the light intensity value of the sunlight and send the light intensity value of the sunlight to the charging unit 6. The charging unit 6 is electrically connected with the vehicle system, and is used to obtain the driving speed of the vehicle. The charging unit 6 is used to determine a first ratio of the light intensity value of the sunlight to a preset light intensity value, determine a second ratio of the driving speed to a preset speed, determine a third angle based on the first ratio and the second ratio, and control the rotating table body 7 to rotate the third angle relative to the driving direction of the vehicle through the driving assembly.

[0096] The difference between the light beam irradiation deflection angle and the third angle is a fourth angle, and the first quotient between the third angle and the fourth angle is equal to the second quotient between the first ratio and the second ratio.

[0097] In this way, the rotation angle of the rotating table body 7 can be adjusted according to the driving speed and the light intensity value of the sunlight, so as to improve the receiving efficiency of the solar panel 1 for the sunlight and reduce the wind resistance of the solar panel 1 as much as possible, thereby reducing the energy consumption of the electric vehicle.

[0098] In an example, the power battery temperature control system further comprises a plurality of jacking assemblies 8 and a sunlight deviation angle detector 10.

[0099] Referring to Figure 6 , the rotating table body 7 has a cylindrical structure, and a plurality of rotating table bodies 7 are arranged in different mounting through holes 201 and rotationally connected with the roof 200. The upper wall surface of the rotating table body 7 is provided with a connecting through hole 71 coaxially arranged with the axis of the rotating table body 7, and the jacking assembly 8 is located in the connecting through hole 71 and is in sliding connection with the connecting through hole 71. The sliding direction of the jacking assembly 8 is parallel to the axis of the connecting through hole 71. As shown in Figure 6 , the panel monomer 11 has a rectangular plate structure, and one edge of the panel monomer 11 is rotationally connected with the upper wall surface of the rotating table body 7 through a hinge.

[0100] Referring to Figure 6 , the sunlight deviation angle detector 10 is located above the roof 200 and connected with the roof 200. The sunlight deviation angle detector 10 has a spherical structure, and the outer surface of the sunlight deviation angle detector 10 is uniformly provided with a plurality of photoelectric sensors. The sunlight deviation angle detector 10 obtains the light intensity value of the sunlight detected by each photoelectric sensor, and determines the photoelectric sensor corresponding to the maximum value of the light intensity value of the sunlight as a target photoelectric sensor. The angle between the axis of the target photoelectric sensor and the center of the sunlight deviation angle detector 10 is determined as the sunlight deviation angle.

[0101] The sunlight deviation angle is the included angle between the sunlight and the vertical direction.

[0102] In implementation, the power battery temperature control system further comprises a driving assembly in transmission connection with the jacking assembly 8. The charging unit 6 is configured to drive the jacking assembly 8 to move in the vertical upward or vertical downward direction, so as to adjust the posture of each panel monomer 11 relative to the roof 200, so that the normal line of the panel monomer 11 is parallel to the sunlight beam.

[0103] Specifically, the charging unit 6 pre-stores a corresponding relationship table of the sunlight deviation angle and the upward moving value of the jacking assembly 8. After the sunlight deviation angle detector 10 determines the sunlight deviation angle, the sunlight deviation angle can be sent to the charging unit 6. The charging unit 6 is configured to determine a target upward moving value based on the corresponding relationship of the sunlight deviation angle and the upward moving value of the jacking assembly 8, and control the jacking assembly 8 to move vertically upward by the target upward moving value through the driving assembly.

[0104] In this way, the solar light receiving efficiency of the solar panel 1 can be improved.

[0105] The technical scheme provided by the embodiments of the present disclosure at least has the following beneficial effects:

[0106] The power battery temperature control system provided by the embodiments of the present disclosure can heat the power battery 100 when the temperature of the power battery 100 is less than the first temperature threshold, so that the power battery 100 still has good performance in a low-temperature environment. In addition, the power battery temperature control system is provided with the solar panel 1 and the energy storage unit 2, the energy storage unit 2 stores the electric energy generated by the solar panel 1 and provides electric energy for the temperature detection unit 3 and the temperature control unit 4, and the electric energy required by the entire power battery temperature control system during the working process is converted from solar energy, so that the endurance of the power battery is not burdened, thereby improving the endurance of the electric vehicle.

[0107] The embodiments of the present disclosure provide an electric vehicle, which comprises the power battery temperature control system described above.

[0108] The above only describes optional embodiments of the present disclosure and does not limit the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A power cell temperature control system, characterized by, The power battery temperature control system comprises a solar cell panel (1), an energy storage unit (2), a temperature detection unit (3), a temperature control unit (4), a direct current conversion circuit (5), a charging unit (6), a plurality of rotating table bodies (7), a plurality of photoelectric sensors (9) and a driving assembly, the temperature detection unit (3) and the temperature control unit (4) are electrically connected with the energy storage unit (2) respectively, and the driving assembly is in transmission connection with the plurality of rotating table bodies (7). The solar cell panel (1) comprises a plurality of cell panel monomers (11), the plurality of cell panel monomers (11) are located outside the roof of an electric vehicle respectively, and each cell panel monomer (11) is connected with the roof through a rotating table body (7). An input end (21) of the energy storage unit (2) is electrically connected with an output end (12) of the solar cell panel (1), and the energy storage unit (2) is used for storing the electric energy generated by the solar cell panel (1). The temperature detection unit (3) is electrically connected with the temperature control unit (4) and is used for detecting the temperature of the power battery (100) and sending the temperature to the temperature control unit (4). The temperature control unit (4) is used for determining the size of the temperature and a temperature threshold value, heating the power battery (100) in the case that the temperature is less than a first temperature threshold value. An input end (51) of the direct current conversion circuit (5) is electrically connected with an output end (22) of the energy storage unit (2), and an output end (52) of the direct current conversion circuit (5) is electrically connected with an input end (101) of the power battery (100). The charging unit (6) is electrically connected with the power battery (100), the direct current conversion circuit (5), the plurality of photoelectric sensors (9) and the driving assembly respectively and is used for: obtaining the state of charge value of the power battery (100), determining the size of the state of charge value and an electric quantity threshold value, and controlling the input end (51) of the direct current conversion circuit (5) and the output end (52) of the direct current conversion circuit (5) to be connected in communication in the case that the state of charge value is less than the electric quantity threshold value; determining the sun azimuth based on the size relationship of the light intensity values detected by the plurality of photoelectric sensors (9), determining the light beam irradiation deflection angle based on the sun azimuth and the driving direction of the current vehicle, and rotating the rotating table body (7) by a first angle relative to the driving direction of the vehicle through the driving assembly, wherein the first angle is equal to the light beam irradiation deflection angle.

2. The power cell temperature control system of claim 1, wherein, The first temperature threshold value is 20℃.

3. The power cell temperature control system of claim 1, wherein, The temperature control unit (4) comprises a heating element (41) and a controller (42). The heating element (41) is located at the outer ring of the power battery (100), and the heating element (41) is electrically connected with the energy storage unit (2). The controller (42) is electrically connected with the heating element (41), configured to receive the temperature of the power battery (100) sent by the temperature detection unit (3), determine the size of the temperature and a first temperature threshold, and control the heating element (41) to heat when the temperature is less than the first temperature threshold.

4. The power cell temperature control system of claim 3, wherein, The temperature control unit (4) further comprises a battery fan (43); An air outlet of the battery fan (43) is arranged opposite to the power battery (100); The controller (42) is electrically connected with the battery fan (43), and is further configured to determine the size of the temperature and a second temperature threshold, and control the battery fan (43) to operate when the temperature is greater than the second temperature threshold, the second temperature threshold being greater than the first temperature threshold.

5. The power battery temperature control system according to claim 4, wherein the second temperature threshold is 40℃.

6. The power cell temperature control system of claim 1, wherein, The power threshold is 18%.

7. The power cell temperature control system of claim 1, wherein, The energy storage unit (2) is a 12-volt direct-current battery.

8. An electric vehicle characterized by comprising: The electric vehicle comprises the power battery temperature control system according to any one of claims 1 to 7.

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