Control method, device, equipment and medium of power battery temperature equalization system

Abstract

The present invention proposes a control method, device, equipment, and medium for a power battery temperature equalization system. The method comprises: when the power battery is in charging mode, obtaining an ambient temperature value; if the ambient temperature value is less than or equal to a first set temperature value and greater than or equal to a second set temperature value, and the power battery requires temperature equalization, determining a temperature equalization system power level; and controlling a water pump and a heating film in the temperature equalization system based on the temperature equalization system power level. Thus, when the power battery is charging and requires temperature equalization, the method controls the temperature equalization system based on the temperature equalization system power level to achieve precise regulation of the battery pack temperature, thereby improving the thermal management efficiency of the battery system.

Description

Technical Field

[0001] The present invention relates to the technical field of power batteries, and in particular to a control method, device, equipment and medium for a power battery temperature equalization system. Background Art

[0002] With the rapid advancement of electric vehicles and energy storage technologies, the performance, safety, and lifespan of power batteries have become a focus of the industry. During the charging process, the non-uniform chemical reactions within the battery cells and the fluctuating external environmental conditions often lead to uneven temperature distribution between the cells. This temperature difference not only erodes the battery's overall performance, accelerates its aging process, and thus shortens its service life, but also significantly increases safety risks, particularly the risk of thermal runaway. Therefore, how to effectively regulate and control the battery pack temperature during the charging process is a pressing issue. Summary of the Invention

[0003] The present invention aims to solve the technical problems in the related art to a certain extent.

[0004] To this end, the first purpose of the present invention is to propose a control method for a power battery temperature equalization system. When the power battery is charging and there is a need for temperature equalization, the method controls the temperature equalization system according to the power level of the temperature equalization system to achieve precise control of the battery pack temperature, thereby improving the thermal management efficiency of the battery system.

[0005] A second objective of the present invention is to provide a control device for a power battery temperature equalization system.

[0006] A third object of the present invention is to provide an electronic device.

[0007] A fourth object of the present invention is to provide a computer-readable storage medium.

[0008] To achieve the above-mentioned objectives, an embodiment of the first aspect of the present invention proposes a control method for a power battery temperature equalization system, including: in response to the working mode of the power battery being in charging mode, obtaining an ambient temperature value; in response to the ambient temperature value being less than or equal to a first set temperature value and the ambient temperature value being greater than or equal to a second set temperature value and the power battery having a temperature equalization requirement, determining a power level of the temperature equalization system; and controlling a water pump and a heating film in the temperature equalization system according to the power level of the temperature equalization system.

[0009] According to an embodiment of the present invention, a method for controlling a power battery temperature equalization system obtains an ambient temperature value when the power battery is in charging mode. If the ambient temperature value is less than or equal to a first set temperature value and greater than or equal to a second set temperature value, and the power battery requires temperature equalization, the method determines the temperature equalization system power level and controls the water pump and heating film in the temperature equalization system based on the temperature equalization system power level. Thus, when the power battery is charging and requires temperature equalization, the method controls the temperature equalization system based on the temperature equalization system power level to achieve precise regulation of the battery pack temperature, thereby improving the thermal management efficiency of the battery system.

[0010] In addition, the control method of the power battery temperature equalization system proposed in the first embodiment of the present invention may also have the following additional technical features:

[0011] In one embodiment of the present invention, controlling the water pump and the heating film in the temperature equalization system according to the power level of the temperature equalization system includes:

[0012] In response to the power level of the temperature balancing system being a first power level, obtaining a temperature difference of cells of the power battery;

[0013] Wherein, if the temperature difference of the battery cell is greater than a first set temperature difference, a thermal management working mode is acquired, and the water pump and the heating film are controlled according to the thermal management working mode;

[0014] If the battery cell temperature difference is less than or equal to the first set temperature difference, the water pump and the heating film are controlled to be turned off.

[0015] In one embodiment of the present invention, controlling the water pump and the heating film in the temperature equalization system according to the power level of the temperature equalization system includes:

[0016] In response to the power level of the temperature balancing system being the second power level, obtaining a thermal management operating mode, and controlling the water pump and the heating film according to the thermal management operating mode;

[0017] The power corresponding to the second power level is greater than the power corresponding to the first power level.

[0018] In one embodiment of the present invention, controlling the water pump and the heating film in the temperature equalization system according to the power level of the temperature equalization system includes:

[0019] In response to the power level of the temperature balancing system being a third power level, obtaining a temperature difference of cells of the power battery;

[0020] Wherein, if the temperature difference of the battery cell is greater than a second set temperature difference, a thermal management working mode is acquired, and the water pump and the heating film are controlled according to the thermal management working mode;

[0021] If the battery cell temperature difference is less than or equal to the second set temperature difference, the water pump and the heating film are controlled to be turned off.

[0022] In one embodiment of the present invention, the method further comprises:

[0023] In response to the ambient temperature value being greater than the first set temperature value, or the ambient temperature value being less than the second set temperature value, obtaining a cell temperature difference of the power battery;

[0024] Wherein, if the temperature difference of the battery cell is less than or equal to a third set temperature difference, the water pump and the heating film are controlled to be turned off;

[0025] If the battery cell temperature difference is greater than the third set temperature difference, a thermal management working mode is acquired, and the water pump and the heating film are controlled according to the thermal management working mode.

[0026] In one embodiment of the present invention, controlling the water pump and the heating film according to the thermal management working mode includes:

[0027] If the thermal management working mode is cooling, the water pump is controlled to be turned on and the heating film is controlled to be turned off;

[0028] If the thermal management working mode is heating, the water pump and the heating film in the temperature equalization system are controlled to be turned on.

[0029] To achieve the above-mentioned purpose, the second aspect of the embodiment of the present invention proposes a control device for a power battery temperature equalization system, including: a first acquisition module, used to obtain the ambient temperature value in response to the working mode of the power battery being in the charging mode; a determination module, used to determine the power level of the temperature equalization system in response to the ambient temperature value being less than or equal to the first set temperature value and the ambient temperature value being greater than or equal to the second set temperature value and the power battery having a temperature equalization requirement; a control module, used to control the water pump and heating film in the temperature equalization system according to the power level of the temperature equalization system.

[0030] According to the present invention, the control device for a power battery temperature equalization system uses a first acquisition module to obtain an ambient temperature value in response to the power battery operating mode being in charging mode. A determination module determines the temperature equalization system power level in response to the ambient temperature being less than or equal to a first set temperature value and greater than or equal to a second set temperature value, and the power battery requires temperature equalization. The control module then controls the water pump and heating film in the temperature equalization system based on the temperature equalization system power level. Thus, when the power battery is charging and requires temperature equalization, the device controls the temperature equalization system based on the temperature equalization system power level, achieving precise regulation of the battery pack temperature and improving the thermal management efficiency of the battery system.

[0031] In addition, the control device of the power battery temperature equalization system provided in the second embodiment of the present invention may also have the following additional technical features:

[0032] In one embodiment of the present invention, the control module is configured to control the water pump and the heating film in the temperature equalization system according to the power level of the temperature equalization system, including:

[0033] In response to the power level of the temperature averaging system being the first power level, obtaining a temperature difference of cells of the power battery;

[0034] Wherein, if the temperature difference of the battery cell is greater than a first set temperature difference, a thermal management working mode is acquired, and the water pump and the heating film are controlled according to the thermal management working mode;

[0035] If the battery cell temperature difference is less than or equal to the first set temperature difference, the water pump and the heating film are controlled to be turned off.

[0036] In one embodiment of the present invention, the control module is configured to control the water pump and the heating film in the temperature equalization system according to the power level of the temperature equalization system, including:

[0037] In response to the power level of the temperature balancing system being the second power level, obtaining a thermal management operating mode, and controlling the water pump and the heating film according to the thermal management operating mode;

[0038] The power corresponding to the second power level is greater than the power corresponding to the first power level.

[0039] In one embodiment of the present invention, the control module is configured to control the water pump and the heating film in the temperature equalization system according to the power level of the temperature equalization system, including:

[0040] In response to the power level of the temperature balancing system being a third power level, obtaining a temperature difference of cells of the power battery;

[0041] Wherein, if the temperature difference of the battery cell is greater than a second set temperature difference, a thermal management working mode is acquired, and the water pump and the heating film are controlled according to the thermal management working mode;

[0042] If the battery cell temperature difference is less than or equal to the second set temperature difference, the water pump and the heating film are controlled to be turned off.

[0043] In one embodiment of the present invention, the apparatus further comprises:

[0044] a second acquisition module, configured to acquire a cell temperature difference of the power battery in response to the ambient temperature value being greater than the first set temperature value, or the ambient temperature value being less than the second set temperature value;

[0045] Wherein, the control module is further configured to control the water pump and the heating film to be turned off when the temperature difference of the battery cell is less than or equal to a third set temperature difference;

[0046] When the battery cell temperature difference is greater than the third set temperature difference, a thermal management working mode is acquired, and the water pump and the heating film are controlled according to the thermal management working mode.

[0047] In one embodiment of the present invention, the control module is configured to control the water pump and the heating film according to the thermal management working mode, including:

[0048] If the thermal management working mode is cooling, the water pump is controlled to be turned on and the heating film is controlled to be turned off;

[0049] If the thermal management working mode is heating, the water pump and the heating film in the temperature equalization system are controlled to be turned on.

[0050] To achieve the above-mentioned object, a third embodiment of the present invention further provides an electronic device, comprising:

[0051] at least one processor; and,

[0052] a memory communicatively connected to the at least one processor; wherein,

[0053] The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the above-mentioned control method of the power battery temperature equalization system.

[0054] The electronic device of an embodiment of the present invention, by executing the above-mentioned control method of the power battery temperature equalization system, controls the temperature equalization system according to the power level of the temperature equalization system when the power battery is charging and there is a need for temperature equalization, so as to achieve precise regulation of the battery pack temperature and improve the thermal management efficiency of the battery system.

[0055] To achieve the above objectives, the fourth embodiment of the present invention further proposes a computer-readable storage medium having computer program instructions stored thereon, which, when executed by a processor, implements the above-mentioned control method for the power battery temperature equalization system.

[0056] The control method of the power battery temperature equalization system of an embodiment of the present invention, by executing the above-mentioned control method of the power battery temperature equalization system, controls the temperature equalization system according to the power level of the temperature equalization system when the power battery is charging and there is a need for temperature equalization, so as to achieve precise regulation of the battery pack temperature and improve the thermal management efficiency of the battery system.

[0057] To achieve the above-mentioned objectives, a fifth embodiment of the present invention further proposes a computer program product, which, when executed by an instruction processor in the computer program product, executes the above-mentioned control method for the power battery temperature equalization system.

[0058] The computer program product of an embodiment of the present invention executes the above-mentioned control method of the power battery temperature equalization system. When the power battery is charging and there is a need for temperature equalization, the temperature equalization system is controlled according to the power level of the temperature equalization system to achieve precise regulation of the battery pack temperature, thereby improving the thermal management efficiency of the battery system.

[0059] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0061] Figure 1 This is a three-dimensional diagram of a power battery temperature equalizing assembly of the present invention;

[0062] Figure 2 This is an exploded view of a power battery temperature equalizing assembly of the present invention;

[0063] Figure 3 is a cross-sectional view of a temperature homogenizing plate of the present invention;

[0064] Figure 4 It is a structural schematic diagram of the heating film of the present invention;

[0065] Figure 5 It is a three-dimensional diagram of another power battery temperature equalizing assembly of the present invention;

[0066] Figure 6 This is an exploded view of another power battery temperature equalizing assembly of the present invention;

[0067] Figure 7 It is a structural schematic diagram of the battery module of the present invention;

[0068] Figure 8 It is an exploded diagram of the battery cell and the power battery temperature equalizing assembly of the present invention;

[0069] Figure 9 It is a structural schematic diagram of the battery module of the present invention (excluding the battery cell);

[0070] Figure 10 is a schematic structural diagram of the battery pack of the present invention;

[0071] Figure 11 is an exploded view of the battery pack of the present invention;

[0072] Figure 12 It is a structural schematic diagram of the battery box of the present invention;

[0073] Figure 13 Schematic diagram of the flow of the temperature-equalizing medium from the battery box to the temperature-equalizing plate of the present invention;

[0074] Figure 14 Schematic diagram of the flow of liquid cooling / direct cooling medium at the bottom of the battery box of the present invention;

[0075] Figure 15 Schematic diagram of the power battery temperature equalization system of the present invention;

[0076] Figure 16 This is a low-voltage connection block diagram of the power battery temperature equalization system of the present invention;

[0077] Figure 17 This is a high voltage connection block diagram of the power battery temperature equalization system of the present invention;

[0078] Figure 18 This is a block diagram of the water / refrigerant pipeline connection of the power battery temperature equalization system of the present invention;

[0079] Figure 19 is a flow chart of a method for controlling a power battery temperature equalizing system according to the present invention;

[0080] Figure 20 is a flow chart of the control process of the power battery temperature equalization system of the present invention;

[0081] Figure 21 It is a block diagram of a control device for a power battery temperature equalization system of the present invention.

[0082] Description of reference numerals: 1-temperature averaging plate, 2-heating film, 3-insulating sheet;

[0083] 100-power battery temperature equalizing assembly, 200-end plate, 300-battery cell, 400-cable tie, 500-battery box;

[0084] 11- medium flow channel, 111- sealing cavity, 112- spacer, 113- first gap, 114- second gap, 12- first side surface, 13- second side surface;

[0085] 21-heating body, 22-wiring harness, 23-connector;

[0086] 510 - box body, 520 - first crossbeam, 521 - medium inlet, 522 - medium outlet, 530 - second crossbeam, 540 - longitudinal beam, 550 - first pipe, 560 - second pipe. DETAILED DESCRIPTION

[0087] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0088] The following describes a control method, device, apparatus, and medium for a power battery temperature equalization system according to embodiments of the present invention with reference to the accompanying drawings.

[0089] Before introducing the control method of the power battery temperature equalization system of the present invention, Figures 1-18 The present invention introduces a power battery temperature equalizing assembly, a battery module and a battery pack.

[0090] Reference Figures 1-6 As shown, the first embodiment of the present invention proposes a power battery temperature equalization assembly, which is placed between two battery cells along the height direction of the battery cells, including a temperature equalization plate 1, a heating film 2 and an insulating sheet 3, wherein:

[0091] A medium flow channel 11 is arranged inside the temperature averaging plate 1 along the length direction and the height direction, and the first side surface 12 and the second side surface 13 of the temperature averaging plate 1 are respectively attached to the heating film 2;

[0092] The insulating sheet 3 is connected to and covers the first side surface 12 and the second side surface 13 , and is located between the temperature dispersion plate 1 and the battery cell.

[0093] It should be noted that the first side 12 and the second side 13 of the temperature equalizing plate 1 are respectively attached to the heating film 2, and the insulating sheet 3 is covered and connected to the first side 12 and the second side 13. After the assembly of the power battery temperature equalizing assembly is completed, one side of the power battery temperature equalizing assembly is attached to one battery cell, and the other side is attached to another battery cell, thereby achieving temperature uniformity of the battery cells in the height direction, and at the same time can assist in achieving temperature uniformity between different battery cells.

[0094] The power battery temperature equalizing assembly proposed in this embodiment is provided with a medium flow channel 11 coiled along the length and height directions inside the temperature equalizing plate 1. The first side 12 and the second side 13 of the temperature equalizing plate 1 are respectively bonded with a heating film 2, which can cool and heat the battery cells bonded on both sides of the power battery temperature equalizing assembly, avoid temperature differences in the battery cells in the vertical direction, achieve temperature equalization of the battery cells, and execute charging and discharging strategies according to the temperature at the top of the battery cells, without damaging the performance and life of the battery cells.

[0095] In some embodiments, a sealed cavity 111 is provided within the vapor chamber 1. A plurality of parallel ribs 112 are provided within the sealed cavity 111. The ribs 112 extend along the length of the vapor chamber 1 and separate the sealed cavity 111 to form a medium flow channel 11. The multiple ribs 112 separate the sealed cavity 111 to form the medium flow channel 11, allowing the medium flow channel 11 to be arranged in a coiled arrangement along the length and height directions, thereby achieving more uniform medium flow and improving the temperature uniformity of the battery cells.

[0096] In some embodiments, two adjacent spacers 112 form a first gap 113 between one end of one spacer 112 and the side of the sealed cavity 111, and a second gap 114 between the other spacer 112 and the side of the sealed cavity 111 at its end away from the first gap 113. The cross-section of the medium flow channel 11 is S-shaped. This structure allows the medium flow channel 11 to form a "snake" shape, with the end connected to the end, ensuring more uniform medium flow and improving the temperature distribution of the battery cells.

[0097] In some embodiments, as Figure 5 and Figure 6 As shown, the heating film 2 is attached to the top surface, first side surface 12, and second side surface 13 of the temperature vapor chamber 1. The bottom of the heating film 2 is higher than the bottom surface of the temperature vapor chamber 1. The insulating sheet 3 is fitted and sleeved outside the heating film 2 and is fitted with the first side surface 12 and second side surface 13 of the temperature vapor chamber 1. The heating film 2 is an integrated U-shaped structure. The heating film 2 is upside down on the temperature vapor chamber 1 to attach to the top surface, first side surface 12, and second side surface 13 of the temperature vapor chamber 1. The bottom of the heating film 2 is higher than the bottom surface of the temperature vapor chamber 1. The insulating sheet 3 is fitted and sleeved outside the heating film 2 and is fitted with the first side surface 12 and second side surface 13 of the temperature vapor chamber 1. The area of ​​the temperature vapor chamber 1 not covered by the heating film 2 is covered by the insulating sheet 3 to avoid the risk of short circuit between the battery cell and the temperature vapor chamber 1, thereby improving the safety and reliability of the device.

[0098] In other embodiments, Figure 1 and Figure 2As shown, two heating films 2 and two insulating sheets 3 are provided. One heating film 2 and one insulating sheet 3 are pasted together to fill the first side 12, and the other heating film 2 and another insulating sheet 3 are pasted together to fill the first side 12 and the second side 13. The insulating sheet 3 is located below the heating film 2. By piecing together the heating film 2 and the insulating sheet 3, the first side 12 and the second side 13 are filled. The insulating sheet 3 is located below the heating film 2, and the area of ​​the vapor chamber 1 not covered by the heating film 2 is covered by the insulating sheet 3, avoiding the risk of short circuit between the battery cell and the vapor chamber 1, thereby improving the safety and reliability of the device.

[0099] In some embodiments, the heating film 2 includes a heating body 21, two wiring harnesses 22, and two connectors 23. The two wiring harnesses 22 are respectively connected to the ends of the heating body 21 in the longitudinal direction, and the ends of the wiring harnesses 22 are respectively connected to the heating body 21 and the connectors 23. The two wiring harnesses 22 are respectively connected to the ends of the heating body 21 in the longitudinal direction, and the ends of the wiring harnesses 22 are respectively connected to the heating body 21 and the connectors 23. The two connectors 23 are respectively connected to the positive and negative poles of the power supply to realize the power supply of the heating film 2. The provision of the connectors 23 improves the convenience of connecting the heating film 2 to the power supply and facilitates assembly and disassembly.

[0100] The working principle of the power battery temperature equalizing assembly is as follows: battery cells are respectively attached to both sides of the power battery temperature equalizing assembly, and a medium flow channel 11 is arranged inside the temperature equalizing plate 1 along the length and height directions. The battery cells are cooled by the medium in the medium flow channel 11. The first side 12 and the second side 13 of the temperature equalizing plate 1 are respectively attached to the heating film 2. The battery cells are heated by the heating film 2, which can avoid temperature differences in the battery cells in the vertical direction, achieve temperature uniformity of the battery cells, and execute charging and discharging strategies according to the temperature of the top of the battery cells, without damaging the performance and life of the battery cells.

[0101] Based on the same concept, the second embodiment of the present invention proposes a battery module, combined with Figure 7-9 As shown, it includes end plates 200, battery cells 300 and the power battery temperature equalizing assembly 100 of the first aspect, at least two rows of battery cells 300 are vertically fixed between the two end plates 200, and the two ends of the cable tie 400 are respectively connected to the two end plates 200, and the battery cells 300 are fixed by the cable tie 400. The power battery temperature equalizing assembly 100 is located between two adjacent rows of battery cells 300, and the two ends of the temperature equalizing plate 1 are respectively connected to the two end plates 200.

[0102] The battery module proposed in this embodiment can achieve temperature uniformity of the battery cell 300 and execute the charging and discharging strategy according to the top temperature of the battery cell 300, without damaging the performance and life of the battery cell 300; at the same time, the two ends of the temperature uniformity plate 1 are respectively connected to the two end plates 200, which can provide strength support for the battery module and reduce the reinforcement structure outside the module, such as the cable tie 400. The cable tie 400 can be reduced from 2 to 1, and the width / strength of the cable tie 400 can be reduced, which can reduce the cost; in addition, the addition of the temperature uniformity component can appropriately reduce the operating power of the liquid cooling / direct cooling system, or shorten the operating time.

[0103] Based on the same concept, the third embodiment of the present invention proposes a battery pack, combined with Figure 10-14 As shown, it includes a battery box 500 and battery cells 300, as well as the power battery temperature equalizing assembly 100 of the first aspect, at least two rows of battery cells 300 are vertically fixed in the battery box 500, at least one surface of each row of battery cells 300 is in contact with the power battery temperature equalizing assembly 100, and both ends of the temperature equalizing plate 1 are respectively connected to the battery box 500.

[0104] It should be noted that a liquid cooling / direct cooling channel is provided at the bottom of the battery box 500 to perform liquid cooling or direct cooling on the bottom of the battery cell 300.

[0105] The battery pack provided in this embodiment can achieve temperature uniformity of the battery cells 300 and execute charging and discharging strategies according to the top temperature of the battery cells 300, without damaging the performance and life of the battery cells 300; at the same time, the two ends of the temperature uniformity plate 1 are respectively connected to the battery box 500, which can provide strength support for the battery box 500, reduce the reinforcement structure of the battery box 500, and reduce costs; in addition, the addition of the temperature uniformity component can appropriately reduce the operating power of the liquid cooling / direct cooling system, or shorten the operating time.

[0106] In some embodiments, the battery box 500 includes a box body 510, a first crossbeam 520, a second crossbeam 530, and two longitudinal beams 540. The first crossbeam 520 and the second crossbeam 530 are fixed to the bottom of the box body 510 at intervals. The ends of the longitudinal beam 540 are respectively connected to the first crossbeam 520 and the second crossbeam 530, forming a square placement area for placing batteries. The ends of the temperature vapor chamber 1 are respectively connected to the first crossbeam 520 and the second crossbeam 530. By connecting the ends of the temperature vapor chamber 1 to the first crossbeam 520 and the second crossbeam 530, the battery box 500 is provided with strength support, which can reduce the reinforcement structure of the battery box 500 and reduce costs.

[0107] In some embodiments, a first channel connected to the medium flow channel 11 is provided within the first crossbeam 520. A medium inlet 521 and a medium outlet 522 connected to the first channel are provided on the first crossbeam 520. The battery box 500 further includes a first pipe 550 and a second pipe 560. The first pipe 550 is connected to the medium inlet 521 and passes through the box body, and the second pipe 560 is connected to the medium outlet 522 and passes through the box body. A second channel connected to the medium flow channel 11 is provided within the second crossbeam 530 to form a circulating temperature-averaging pipeline. The medium enters the medium inlet 521 from the first pipe 550, flows into the medium flow channel 11 from the first channel, returns to the first channel after circulation, and flows out of the second pipe 560 through the medium outlet 522 before being discharged. The medium can also circulate between the medium flow channels 11 of two adjacent temperature-averaging plates 1 through the second channel, forming a circulating temperature-averaging pipeline. This can achieve uniform temperature of the battery cells 300 in the height direction, and can also assist in achieving uniform temperature between different battery cells 300.

[0108] In some embodiments, as Figure 14 As shown, the liquid cooling / direct cooling channel at the bottom of the battery box 500 can also be S-shaped, similar to the medium channel 11, which can improve the uniformity of cooling and improve reliability and stability.

[0109] The following combination Figure 15-18 The power battery temperature equalization system of the present invention is introduced.

[0110] Figure 15 Schematic diagram of the power battery temperature equalization system of the present invention. Figure 15 As shown, the power battery temperature equalization system of the present invention includes: a battery pack, a vehicle liquid cooling / direct cooling system, a low-voltage power supply, a water pump, a water tank, a high-voltage power distribution unit (PDU), multiple temperature equalization components (consisting of battery cells, heating film, and temperature equalization plate) within the battery pack, a battery management system (BMS), a battery distribution unit (BDU), and liquid cooling / direct cooling plates. Other components not directly related to the present invention are not described here.

[0111] The present invention adjusts the temperature difference of the battery cell body by adding a temperature averaging system (including a temperature averaging plate, a heating film, a water pump, a water tank, and related connecting pipes and joints).

[0112] Figure 16 This is a low-voltage connection block diagram of the power battery temperature equalization system of the present invention, such as Figure 16 As shown, the low-voltage connections between parts mainly include low-voltage power supply, communication, sampling, etc.

[0113] Figure 17 This is a high-voltage connection block diagram of the power battery temperature equalization system of the present invention. The high-voltage connection between the parts is mainly powered by a high-voltage power supply for energy transfer.

[0114] Figure 18This is a block diagram of the water / refrigerant pipeline connection of the power battery temperature equalization system of the present invention. The water / refrigerant pipeline connection between parts is mainly to provide a flow boundary for the cooling medium. During the flow process, heat exchange is carried out at the corresponding part positions.

[0115] Figure 19 4 is a flow chart of a method for controlling a power battery temperature equalization system according to an embodiment of the present invention.

[0116] like Figure 19 As shown, the control method of the power battery temperature equalization system according to the embodiment of the present invention includes the following steps:

[0117] S1: In response to the power battery operating mode being in the charging mode, obtaining an ambient temperature value.

[0118] S2 : In response to the ambient temperature being less than or equal to the first set temperature and greater than or equal to the second set temperature, and the power battery having a temperature equalization requirement, determining a power level of the temperature equalization system.

[0119] In this step, the process of determining whether the battery pack in the power battery has a temperature equalization requirement may include: obtaining the temperature values ​​of multiple battery cells in the battery pack; determining the temperature peak (highest battery cell temperature) and temperature valley (lowest battery cell temperature) from the temperature values ​​of the multiple battery cells; and judging whether the battery pack has a temperature equalization requirement based on the temperature peak and temperature valley. Specifically, if the temperature valley is greater than a first set temperature valley value t1, such as 45°C, it is determined that the battery pack has a temperature equalization requirement, and the type of temperature equalization requirement is a cooling temperature equalization requirement; if the temperature peak is less than a second set temperature peak value t2, such as 0°C, it is determined that the battery pack has a temperature equalization requirement, and the type of temperature equalization requirement is a heating temperature equalization requirement; if the temperature valley is less than or equal to the first set temperature valley value t1, and the temperature peak is greater than or equal to the second set temperature peak value t2, it is determined that the battery pack has no temperature equalization requirement.

[0120] In an embodiment of the present invention, Figure 20 As shown, when the ambient temperature is greater than the first set temperature (cooling only) or less than the second set temperature (heating only), the temperature difference of the power battery cells is obtained. If the temperature difference is less than or equal to the third set temperature difference t6, the water pump and the heating film are both controlled to be off. If the temperature difference is greater than the third set temperature difference t6, the thermal management working mode is obtained and the water pump and the heating film are controlled according to the thermal management working mode. If the thermal management working mode is cooling, the water pump is controlled to be on and the heating film is off; if the thermal management working mode is heating, the water pump and the heating film in the temperature equalization system are controlled to be on.

[0121] In this step, the process of determining the power level of the temperature equalization system includes: when the battery pack in the power battery has a temperature equalization requirement, in addition to obtaining the ambient temperature value T, the bus current value RMS within a set time length, such as 1 minute, and the current remaining capacity value C of the battery pack are also obtained. The bus current value is used to characterize the current value flowing through the bus connecting the battery pack and the external load or charging equipment, and the ratio RMS / C of the bus current value RMS within the set time length and the current remaining capacity value C is calculated. According to the ambient temperature value and the ratio RMS / C, the power level of the temperature equalization system is determined.

[0122] Example 1: The average temperature requirement type is cooling average temperature requirement.

[0123] Determine the power level of the temperature equalization system based on the ambient temperature value T and the ratio RMS / C, including:

[0124] When the ambient temperature value T is less than or equal to the third set temperature value T3, such as 35°C, if the ratio RMS / C is less than or equal to the first set value C4, such as 1.6, the power level of the temperature averaging system is determined to be the first power level, that is, the low-demand cooling temperature averaging operating condition;

[0125] When the ambient temperature value T is less than or equal to the third set temperature value T3, if the ratio RMS / C is set to be greater than the first set value C4, the speed value R of the compressor in the power battery temperature equalization system is obtained, and the power level of the temperature equalization system is determined based on the speed value R of the compressor;

[0126] When the ambient temperature T is less than or equal to the fourth set temperature T4, such as 40°C, and greater than the third set temperature T3, if the ratio RMS / C is greater than the second set value C3, such as 1.2, the compressor speed value R is obtained, and the power level of the temperature equalization system is determined based on the compressor speed value R.

[0127] When the ambient temperature value T is greater than the fourth set temperature T4, the power level of the temperature equalization system is determined to be the second power level, that is, the high-demand cooling temperature equalization working condition;

[0128] The power corresponding to the first power level is less than the power corresponding to the second power level.

[0129] According to the compressor speed value R, the power level of the temperature equalization system is determined, including:

[0130] If the speed value R of the compressor is greater than the first set speed value R1, such as 3000 r / min, the power level of the temperature equalization system is determined to be the third power level, that is, the medium demand cooling temperature equalization working condition;

[0131] If the speed value R of the compressor is less than or equal to the first set speed value R1, the power level of the temperature equalization system is determined to be the first power level, that is, the low-demand cooling temperature equalization working condition;

[0132] If the speed value R of the compressor is greater than the second set speed value R2, such as 5000 r / min, the power level of the temperature equalization system is determined to be the second power level, that is, the high-demand cooling temperature equalization working condition;

[0133] If the speed value of the compressor is less than or equal to the second set speed value R2, the power level of the temperature equalization system is determined to be the third power level, that is, the medium demand cooling temperature equalization working condition;

[0134] The power corresponding to the first power level is less than the power corresponding to the third power level, and the power corresponding to the third power level is less than the power corresponding to the second power level.

[0135] Example 2: The type of uniform temperature requirement is heating uniform temperature requirement.

[0136] Determine the power level of the temperature equalization system based on the ambient temperature value T and the ratio RMS / C, including:

[0137] When the ambient temperature value T is greater than or equal to the fifth set temperature value T2, such as 0°C, if the ratio RMS / C is less than or equal to the third set value C2, such as 1, the power level of the temperature equalization system is determined to be the first power level, that is, the low-demand heating temperature equalization working condition;

[0138] When the ambient temperature value T is greater than or equal to the fifth set temperature value T2, if the ratio RMS / C is greater than the third set value C2, the speed value R of the compressor in the power battery temperature equalization system and the gear position of the heating film in the temperature equalization assembly (the gear position of the PTC heating film, hereinafter referred to as the PTC gear position) are obtained, and the power level of the temperature equalization system is determined based on the speed value R of the compressor and the gear position of the heating film;

[0139] When the ambient temperature value T is greater than or equal to the sixth set temperature T1, such as -10°C, and less than the fifth set temperature value T2, if the ratio is greater than the fourth set value C1, such as 0.8, the speed value R of the compressor and the gear position of the heating film are obtained, and the power level of the temperature equalization system is determined according to the speed value R of the compressor and the gear position of the heating film;

[0140] When the ambient temperature value T is lower than the sixth set temperature T1, the power level of the temperature equalization system is determined to be the second power level, ie, a high-demand heating temperature equalization working condition.

[0141] The power level of the temperature equalization system is determined based on the compressor speed value R and the gear position of the heating film, including:

[0142] If the speed value R of the compressor is greater than the first set speed value R1 or the gear position of the heating film is the first set gear position, the power level of the temperature equalization system is determined to be the first power level, that is, the low-demand heating temperature equalization working condition;

[0143] If the speed value R of the compressor is less than or equal to the first set speed value R1 and the gear position of the heating film is not the first set gear position, the power level of the temperature equalization system is determined to be the third power level, that is, the medium demand heating temperature equalization working condition;

[0144] If the speed value R of the compressor is greater than the second set speed value R2 or the gear position of the heating film is the second set gear position, the power level of the temperature equalization system is determined to be the second power level, that is, the high-demand heating temperature equalization working condition;

[0145] If the speed value R of the compressor is less than or equal to the second set speed value R2 and the gear position of the heating film is not the second set gear position, the power level of the temperature equalization system is determined to be the third power level, that is, the medium demand heating temperature equalization working condition.

[0146] S3, controls the water pump and heating film in the temperature equalization system according to the power level of the temperature equalization system.

[0147] Step S3 includes the following situations: Figure 20 As shown:

[0148] Case 1: The temperature equalization system power level is the first power level. In this case, the power battery cell temperature difference Δt is required. If the cell temperature difference Δt is greater than the first set temperature difference t8, the thermal management operating mode is determined and the water pump and heating film are controlled accordingly. If the cell temperature difference Δt is less than or equal to the first set temperature difference t8, both the water pump and the heating film are turned off. If the thermal management operating mode is cooling, the water pump is turned on and the heating film is turned off. If the thermal management operating mode is heating, both the water pump and the heating film in the temperature equalization system are turned on.

[0149] Case 2: The temperature-averaging system power level is the second power level. The thermal management operating mode is obtained, and the water pump and heating film are controlled based on the thermal management operating mode. The power corresponding to the second power level is greater than the power corresponding to the first power level. If the thermal management operating mode is cooling, the water pump is turned on and the heating film is turned off. If the thermal management operating mode is heating, both the water pump and the heating film in the temperature-averaging system are turned on.

[0150] Case 3: The temperature equalization system power level is the third power level. In this case, the power battery cell temperature difference Δt is required. If the cell temperature difference Δt is greater than the second set temperature difference t7, the thermal management operating mode is determined and the water pump and heating film are controlled accordingly. If the cell temperature difference Δt is less than or equal to the second set temperature difference t7, both the water pump and the heating film are turned off. If the thermal management operating mode is cooling, the water pump is turned on and the heating film is turned off. If the thermal management operating mode is heating, both the water pump and the heating film in the temperature equalization system are turned on.

[0151] It should be noted that t6, t7, and t8 used in the present invention are derived based on the simulation, testing, and performance of the battery. Under normal circumstances: t8>t7>t6. For example, through simulation and test data, the approximate relationship between the maximum temperature difference between battery cells and the maximum temperature difference of the battery cell body under different thermal management conditions and electrical performance conditions can be found. Based on the relationship diagram and the power performance of the battery pack / battery cell, the corresponding t6, t7, and t8 points are selected to determine the values, such as t6=10°C, t7=12°C, and t8=14°C.

[0152] In summary, according to the control method for a power battery temperature equalization system according to an embodiment of the present invention, when the power battery is in charging mode, the ambient temperature value is obtained. If the ambient temperature value is less than or equal to a first set temperature value and greater than or equal to a second set temperature value, and the power battery requires temperature equalization, the temperature equalization system power level is determined, and the water pump and heating film in the temperature equalization system are controlled based on the temperature equalization system power level. Thus, when the power battery is charging and requires temperature equalization, this method controls the temperature equalization system based on the temperature equalization system power level to achieve precise regulation of the battery pack temperature, thereby improving the thermal management efficiency of the battery system.

[0153] Figure 21 It is a block diagram of a control device for a power battery temperature equalization system of the present invention.

[0154] like Figure 21 As shown, the control device 1000 of the power battery temperature equalization system of the present invention includes:

[0155] The first acquisition module 1100 is configured to acquire an ambient temperature value in response to the power battery operating in the charging mode.

[0156] The determination module 1200 is configured to determine a power level of the temperature balancing system in response to the ambient temperature being less than or equal to a first set temperature and greater than or equal to a second set temperature and the power battery having a temperature balancing requirement.

[0157] The control module 1300 is used to control the water pump and the heating film in the temperature balancing system according to the power level of the temperature balancing system.

[0158] In one embodiment of the present invention, the control module 1300 is configured to control the water pump and the heating film in the temperature balancing system according to the power level of the temperature balancing system, including:

[0159] In response to the power level of the temperature averaging system being the first power level, obtaining a temperature difference of cells of the power battery;

[0160] If the temperature difference of the battery cells is greater than the first set temperature difference, a thermal management working mode is obtained, and the water pump and the heating film are controlled according to the thermal management working mode;

[0161] If the temperature difference of the battery cells is less than or equal to the first set temperature difference, the water pump and the heating film are controlled to be turned off.

[0162] In one embodiment of the present invention, the control module 1300 is configured to control the water pump and the heating film in the temperature balancing system according to the power level of the temperature balancing system, including:

[0163] In response to the power level of the temperature averaging system being the second power level, obtaining a thermal management operating mode, and controlling the water pump and the heating film according to the thermal management operating mode;

[0164] The power corresponding to the second power level is greater than the power corresponding to the first power level.

[0165] In one embodiment of the present invention, the control module 1300 is configured to control the water pump and the heating film in the temperature balancing system according to the power level of the temperature balancing system, including:

[0166] In response to the power level of the temperature averaging system being the third power level, obtaining a temperature difference of the power battery cells;

[0167] If the temperature difference of the battery cells is greater than the second set temperature difference, a thermal management working mode is obtained, and the water pump and the heating film are controlled according to the thermal management working mode;

[0168] If the cell temperature difference is less than or equal to the second set temperature difference, the water pump and the heating film are controlled to be turned off.

[0169] In one embodiment of the present invention, the apparatus further comprises:

[0170] a second acquisition module, configured to acquire a cell temperature difference of the power battery in response to the ambient temperature value being greater than the first set temperature value, or the ambient temperature value being less than the second set temperature value;

[0171] The control module 1300 is further configured to control the water pump and the heating film to be turned off when the temperature difference of the battery cell is less than or equal to a third set temperature difference;

[0172] When the temperature difference of the battery cells is greater than the third set temperature difference, a thermal management working mode is obtained, and the water pump and the heating film are controlled according to the thermal management working mode.

[0173] In one embodiment of the present invention, the control module 1300 is configured to control the water pump and the heating film according to the thermal management working mode, including:

[0174] If the thermal management working mode is cooling, the water pump is controlled to be turned on and the heating film is turned off;

[0175] If the thermal management working mode is heating, the water pump and heating film in the temperature equalization system are controlled to be turned on.

[0176] It should be noted that for details not disclosed in the control device of the battery temperature equalization system in the embodiment of the present invention, please refer to the details disclosed in the control method of the battery temperature equalization system in the embodiment of the present invention, and the details will not be disclosed here.

[0177] According to the present invention, the control device for a power battery temperature equalization system uses a first acquisition module to obtain an ambient temperature value in response to the power battery operating mode being in charging mode. A determination module determines the temperature equalization system power level in response to the ambient temperature being less than or equal to a first set temperature value and greater than or equal to a second set temperature value, and the power battery requires temperature equalization. The control module then controls the water pump and heating film in the temperature equalization system based on the temperature equalization system power level. Thus, when the power battery is charging and requires temperature equalization, the device controls the temperature equalization system based on the temperature equalization system power level, achieving precise regulation of the battery pack temperature and improving the thermal management efficiency of the battery system.

[0178] Based on the above embodiments, the present invention further provides an electronic device, including:

[0179] at least one processor; and,

[0180] a memory communicatively connected to the at least one processor; wherein,

[0181] The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the above-mentioned control method of the power battery temperature equalization system.

[0182] The electronic device of an embodiment of the present invention, by executing the above-mentioned control method of the power battery temperature equalization system, controls the temperature equalization system according to the power level of the temperature equalization system when the power battery is charging and there is a need for temperature equalization, so as to achieve precise regulation of the battery pack temperature and improve the thermal management efficiency of the battery system.

[0183] Based on the above embodiments, the present invention further proposes a computer-readable storage medium having computer program instructions stored thereon, which implement the above-mentioned control method for the power battery temperature equalization system when executed by a processor.

[0184] The control method of the power battery temperature equalization system of an embodiment of the present invention, by executing the above-mentioned control method of the power battery temperature equalization system, controls the temperature equalization system according to the power level of the temperature equalization system when the power battery is charging and there is a need for temperature equalization, so as to achieve precise regulation of the battery pack temperature and improve the thermal management efficiency of the battery system.

[0185] Based on the above embodiments, the present invention further proposes a computer program product. When an instruction processor in the computer program product is executed, the above-mentioned control method of the power battery temperature equalization system is executed.

[0186] The computer program product of an embodiment of the present invention executes the above-mentioned control method of the power battery temperature equalization system. When the power battery is charging and there is a need for temperature equalization, the temperature equalization system is controlled according to the power level of the temperature equalization system to achieve precise regulation of the battery pack temperature, thereby improving the thermal management efficiency of the battery system.

[0187] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0188] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0189] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention pertain.

[0190] The logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include the following: an electrical connection with one or more wires (electronic devices), a portable computer disk cartridge (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic devices, and a portable compact disc read-only memory (CDROM). Furthermore, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing it in another suitable manner if necessary, and then storing it in a computer memory.

[0191] It should be understood that various parts of the present invention can be implemented using hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0192] Those skilled in the art will understand that all or part of the steps in the method of the above embodiment can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiment.

[0193] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing module, or each unit may exist physically separately, or two or more units may be integrated into a single module. The aforementioned integrated modules may be implemented in the form of hardware or in the form of software functional modules. If the integrated modules are implemented in the form of software functional modules and sold or used as independent products, they may also be stored in a computer-readable storage medium.

[0194] The storage medium mentioned above may be a read-only memory, a magnetic disk, or an optical disk, etc. Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and are not to be construed as limiting the present invention. Persons skilled in the art may make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for controlling a power battery temperature equalization system, comprising: In response to the operating mode of the power battery being in the charging mode, obtaining an ambient temperature value; In response to the ambient temperature being less than or equal to a first set temperature and greater than or equal to a second set temperature, and the power battery having a temperature equalization requirement, determining a power level of a temperature equalization system; Controlling the water pump and the heating film in the temperature equalization system according to the power level of the temperature equalization system; The controlling of the water pump and the heating film in the temperature balancing system according to the power level of the temperature balancing system includes: In response to the power level of the temperature balancing system being a first power level, obtaining a temperature difference of the power battery cells; wherein, if the temperature difference of the power battery cells is greater than a first set temperature difference, obtaining a thermal management operating mode, and controlling the water pump and the heating film according to the thermal management operating mode; and if the temperature difference of the power battery cells is less than or equal to the first set temperature difference, controlling both the water pump and the heating film to be turned off; In response to the power level of the temperature balancing system being the second power level, obtaining a thermal management operating mode, and controlling the water pump and the heating film according to the thermal management operating mode; In response to the power level of the temperature equalization system being the third power level, the temperature difference of the power battery cells is obtained; wherein, if the temperature difference of the battery cells is greater than the second set temperature difference, the thermal management working mode is obtained, and the water pump and the heating film are controlled according to the thermal management working mode; if the temperature difference of the battery cells is less than or equal to the second set temperature difference, the water pump and the heating film are controlled to be closed; wherein, the power corresponding to the first power level is less than the power corresponding to the third power level, and the power corresponding to the third power level is less than the power corresponding to the second power level.

2. The method according to claim 1, characterized in that The method further comprises: In response to the ambient temperature value being greater than the first set temperature value, or the ambient temperature value being less than the second set temperature value, obtaining a cell temperature difference of the power battery; Wherein, if the temperature difference of the battery cell is less than or equal to a third set temperature difference, the water pump and the heating film are controlled to be turned off; If the battery cell temperature difference is greater than the third set temperature difference, a thermal management working mode is acquired, and the water pump and the heating film are controlled according to the thermal management working mode.

3. The method according to claim 1 or 2, characterized in that The controlling of the water pump and the heating film according to the thermal management working mode includes: If the thermal management working mode is cooling, the water pump is controlled to be turned on and the heating film is controlled to be turned off; If the thermal management working mode is heating, the water pump and the heating film in the temperature equalization system are controlled to be turned on.

4. A control device for a power battery temperature equalization system, characterized in that: include: A first acquisition module is configured to acquire an ambient temperature value in response to the operating mode of the power battery being in a charging mode; a determination module, configured to determine a power level of a temperature equalization system in response to the ambient temperature value being less than or equal to a first set temperature value and the ambient temperature value being greater than or equal to a second set temperature value and the power battery having a temperature equalization requirement; A control module, configured to control a water pump and a heating film in the temperature averaging system according to a power level of the temperature averaging system; The control module is used to control the water pump and the heating film in the temperature equalization system according to the power level of the temperature equalization system, including: In response to the power level of the temperature balancing system being a first power level, obtaining a temperature difference of the power battery cells; wherein, if the temperature difference of the power battery cells is greater than a first set temperature difference, obtaining a thermal management operating mode, and controlling the water pump and the heating film according to the thermal management operating mode; and if the temperature difference of the power battery cells is less than or equal to the first set temperature difference, controlling both the water pump and the heating film to be turned off; In response to the power level of the temperature balancing system being the second power level, obtaining a thermal management operating mode, and controlling the water pump and the heating film according to the thermal management operating mode; In response to the power level of the temperature equalization system being the third power level, the temperature difference of the power battery cells is obtained; wherein, if the temperature difference of the battery cells is greater than the second set temperature difference, the thermal management working mode is obtained, and the water pump and the heating film are controlled according to the thermal management working mode; if the temperature difference of the battery cells is less than or equal to the second set temperature difference, the water pump and the heating film are controlled to be closed; wherein, the power corresponding to the first power level is less than the power corresponding to the third power level, and the power corresponding to the third power level is less than the power corresponding to the second power level.

5. The device according to claim 4, characterized in that The device further comprises: a second acquisition module, configured to acquire a cell temperature difference of the power battery in response to the ambient temperature value being greater than the first set temperature value, or the ambient temperature value being less than the second set temperature value; Wherein, the control module is further configured to control the water pump and the heating film to be turned off when the temperature difference of the battery cell is less than or equal to a third set temperature difference; When the battery cell temperature difference is greater than the third set temperature difference, a thermal management working mode is acquired, and the water pump and the heating film are controlled according to the thermal management working mode.

6. An electronic device, characterized in that: include: at least one processor; as well as, a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the control method of the power battery temperature balancing system according to any one of claims 1 to 3.

7. A computer-readable storage medium having computer program instructions stored thereon, characterized in that: When the program instructions are executed by a processor, the control method of the power battery temperature equalization system according to any one of claims 1 to 3 is implemented.

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