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

Abstract

The application provides a control method, device and equipment of a power battery uniform temperature system and a medium. The method comprises the following steps: in the case that the working mode of the power battery is in a discharging mode, judging whether the power battery has a uniform temperature demand; in the case that the power battery has the uniform temperature demand, acquiring a bus current value and a cell temperature difference of the power battery within a set time length, and controlling the uniform temperature system according to the bus current value and the cell temperature difference within the set time length, so as to realize the regulation and control of the cell temperature. Therefore, in the case that the power battery is discharging and has the uniform temperature demand, the uniform temperature system is controlled according to the bus current value within the set time length and the cell temperature difference of the power battery, so as to realize the accurate regulation and control of the battery pack temperature, and the thermal management efficiency of the battery system is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power batteries, and in particular to a control method and device for a power battery temperature equalization system, an electronic device and a computer readable storage medium. BACKGROUND

[0002] With the rapid development of electric vehicles and energy storage systems, the performance, safety and service life of power batteries have become the focus of the industry. During the discharge process of power batteries, due to the non-uniformity of the internal chemical reaction of the battery cell and the influence of external environmental factors, temperature inconsistencies between battery cells will occur. Such temperature differences between battery cells not only affect the performance of the battery, accelerate the aging process of the battery and shorten the service life of the battery, but also can cause a series of safety problems, especially the risk of thermal runaway significantly increases. Therefore, how to effectively regulate the temperature difference between battery cells during the discharge process of the battery and improve the thermal management efficiency of the battery system is a key problem to be solved at present. SUMMARY

[0003] The present application aims to solve the technical problems in the related art to some extent.

[0004] To this end, a first object of the present application is to provide a control method for a power battery temperature equalization system. When the power battery is in a discharge mode and has a temperature equalization requirement, the control method controls the temperature equalization system according to the bus current value within a set time period and the cell temperature difference of the power battery, so as to accurately regulate the temperature of the battery pack and improve the thermal management efficiency of the battery system.

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

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

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

[0008] To achieve the above objects, a control method for a power battery temperature equalization system is provided in a first aspect of the present application, comprising: in response to the working mode of the power battery being in a discharge mode, determining whether the power battery has a temperature equalization requirement; in response to the power battery having a temperature equalization requirement, obtaining a bus current value within a set time period and a cell temperature difference of the power battery; wherein the bus current value is used to represent the current value flowing through the bus connecting the battery pack and the external load or charging device; and controlling the temperature equalization system according to the bus current value within the set time period and the cell temperature difference, so as to regulate the temperature of the battery cell.

[0009] The control method of the power battery uniform temperature system according to the embodiment of the present application, in the case that the working mode of the power battery is in the discharging mode, judges whether the power battery has the uniform temperature demand, in the case that the power battery has the uniform temperature demand, acquires the bus current value and the cell temperature difference of the power battery within the set time length, and controls the uniform temperature system according to the bus current value and the cell temperature difference within the set time length, so as to realize the regulation and control of the cell temperature. Therefore, in the case that the power battery is in the discharging mode and has the uniform temperature demand, the control method controls the uniform temperature system according to the bus current value within the set time length and the cell temperature difference of the power battery, so as to realize the accurate regulation and control of the battery pack temperature, and improves the thermal management efficiency of the battery system.

[0010] In addition, the control method of the power battery uniform temperature system according to the first aspect of the present application can have the following additional technical features:

[0011] In an embodiment of the present application, the control of the uniform temperature system according to the bus current value within the set time length and the cell temperature difference includes:

[0012] In response to the bus current value within the set time length being greater than or equal to a set current value, determining the power level of the uniform temperature system;

[0013] controlling the water pump and the heating film in the uniform temperature system according to the power level of the uniform temperature system and the cell temperature difference; wherein the water pump is used for pumping the cooling medium, and the circulation speed of the cooling medium in the power battery is controlled by adjusting the rotating speed or flow of the water pump; the heating film is used for heating the cell, and the temperature of the cell heating is controlled by adjusting the heating power of the heating film.

[0014] In an embodiment of the present application, the control of the water pump and the heating film in the uniform temperature system according to the power level of the uniform temperature system and the cell temperature difference includes:

[0015] In response to the power level of the uniform temperature system being the first power level, if the cell temperature difference is less than or equal to a first set temperature difference, the water pump and the heating film are both controlled to be closed;

[0016] In response to the power level of the uniform temperature system being the first power level, if the cell temperature difference is greater than the first set temperature difference, the thermal management working mode is acquired, and the water pump and the heating film are controlled according to the thermal management working mode.

[0017] In an embodiment of the present application, the control of the water pump and the heating film in the uniform temperature system according to the power level of the uniform temperature system and the cell temperature difference includes:

[0018] In response to the uniform temperature system power level being a second power level, a thermal management working mode is obtained, and the water pump and the heating film in the uniform temperature system are controlled according to the thermal management working mode.

[0019] The power corresponding to the first power level is less than the power corresponding to the third power level and is less than the power corresponding to the second power level.

[0020] In an embodiment of the present application, the controlling the water pump and the heating film in the uniform temperature system according to the uniform temperature system power level and the battery cell temperature difference comprises:

[0021] In response to the uniform temperature system power level being a third power level, if the battery cell temperature difference is less than or equal to a second set temperature difference, the water pump and the heating film are controlled to be closed.

[0022] In response to the uniform temperature system power level being the third power level, if the battery cell temperature difference is greater than the second set temperature difference, a thermal management working mode is obtained, and the water pump and the heating film in the uniform temperature system are controlled according to the thermal management working mode.

[0023] The power corresponding to the third power level is greater than the power corresponding to the first power level and is less than the power corresponding to the second power level, and the second set temperature difference is less than the first set temperature difference.

[0024] In an embodiment of the present application, the method further comprises:

[0025] In response to the power battery having no uniform temperature requirement or the bus current value being less than a set current value within the set time length, the battery cell temperature difference is obtained, and the uniform temperature system is controlled according to the battery cell temperature.

[0026] If the battery cell temperature difference is greater than a 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.

[0027] If the battery cell temperature difference is less than or equal to the third set temperature difference, the water pump and the heating film are controlled to be closed.

[0028] The third set temperature difference is greater than the first set temperature difference.

[0029] In an embodiment of the present application, the controlling the water pump and the heating film in the uniform temperature system according to the thermal management working mode comprises:

[0030] In response to the thermal management working mode being cooling, the water pump is controlled to be opened and the heating film is controlled to be closed.

[0031] In response to the thermal management operating mode being heating, both the water pump and the heating film are turned on.

[0032] To achieve the above objectives, a second aspect of the present invention provides a control device for a power battery temperature equalization system, comprising: a judgment module, configured to determine whether the power battery requires temperature equalization in response to the power battery being in a discharge mode; an acquisition module, configured to acquire a bus current value and a cell temperature difference of the power battery within a set time period in response to the power battery requiring temperature equalization; wherein the bus current value is used to characterize the current value flowing through the bus connecting the battery pack to an external load or charging device; and a control module, configured to control the temperature equalization system according to the bus current value and the cell temperature difference within the set time period, so as to achieve regulation of the cell temperature.

[0033] The control device for the power battery temperature equalization system according to the present invention determines whether the power battery requires temperature equalization when the power battery is in discharge mode by a judgment module. When the power battery requires temperature equalization, an acquisition module acquires the bus current value and the cell temperature difference of the power battery within a set time period. The control module controls the temperature equalization system based on the bus current value and cell temperature difference within the set time period to regulate the cell temperature. Therefore, when the power battery is discharging and requires temperature equalization, this device controls the temperature equalization system based on the bus current value and cell temperature difference within a set time period to achieve precise regulation of the battery pack temperature and improve the thermal management efficiency of the battery system.

[0034] In addition, the control device for the power battery temperature equalization system proposed in the second aspect embodiment of the present invention may also have the following additional technical features:

[0035] In one embodiment of the present invention, when the control module controls the temperature equalization system based on the bus current value and the cell temperature difference within the set time period, it includes:

[0036] In response to the bus current value being greater than or equal to the set current value within the set time period, the power level of the temperature equalization system is determined.

[0037] Based on the power level of the temperature equalization system and the temperature difference of the battery cells, the water pump and heating film in the temperature equalization system are controlled; wherein, the water pump is used to pump the cooling medium, and the circulation speed of the cooling medium inside the power battery is controlled by adjusting the speed or flow rate of the water pump; the heating film is used to heat the battery cells, and the heating temperature of the battery cells is controlled by adjusting the heating power of the heating film.

[0038] In one embodiment of the present invention, when the control module is used to control the water pump and heating film in the temperature equalization system according to the power level of the temperature equalization system and the temperature difference of the battery cells, it includes:

[0039] In response to the temperature equalization system being at the first power level, if the temperature difference of the battery cells is less than or equal to the first set temperature difference, then the water pump and the heating film are both controlled to shut down.

[0040] In response to the temperature equalization system power level being the first power level, if the cell temperature difference is greater than the first set temperature difference, a thermal management operating mode is acquired, and the water pump and the heating film are controlled according to the thermal management operating mode.

[0041] In one embodiment of the present invention, when the control module is used to control the water pump and heating film in the temperature equalization system according to the power level of the temperature equalization system and the temperature difference of the battery cells, it includes:

[0042] In response to the temperature equalization system being at the second power level, a thermal management operating mode is obtained, and the water pump and heating film in the temperature equalization system are controlled according to the thermal management operating mode.

[0043] Wherein, the power corresponding to the first power level is less than the power corresponding to the third power level.

[0044] In one embodiment of the present invention, when the control module is used to control the water pump and heating film in the temperature equalization system according to the power level of the temperature equalization system and the temperature difference of the battery cells, it includes:

[0045] In response to the temperature equalization system being at the third power level, 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 shut down.

[0046] In response to the temperature equalization system power level being the third power level, if the cell temperature difference is greater than the second set temperature difference, a thermal management operating mode is obtained, and the water pump and heating film in the temperature equalization system are controlled according to the thermal management operating mode.

[0047] Wherein, the power corresponding to the third power level is greater than the power corresponding to the first power level and less than the power corresponding to the second power level, and the second set temperature difference is less than the first set temperature difference.

[0048] In one embodiment of the present invention, the control module is further configured to:

[0049] When the power battery has no temperature equalization requirement, or when the bus current value is less than the set current value within the set time period, the cell temperature difference is obtained, and the temperature equalization system is controlled according to the cell temperature; wherein,

[0050] If the temperature difference of the battery cell 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.

[0051] If the temperature difference of the battery cell is less than or equal to the third set temperature difference, then the water pump and the heating film are both turned off.

[0052] The third set temperature difference is greater than the first set temperature difference.

[0053] In one embodiment of the present invention, when the control module controls the water pump and heating film in the temperature equalization system according to the thermal management operating mode, it includes:

[0054] In response to the thermal management operating mode being cooling, the water pump is turned on and the heating film is turned off.

[0055] In response to the thermal management operating mode being heating, both the water pump and the heating film are turned on.

[0056] To achieve the above objectives, a third aspect of the present invention also provides an electronic device, comprising:

[0057] At least one processor; and,

[0058] A memory communicatively connected to the at least one processor; wherein,

[0059] The memory stores instructions that can be executed by the at least one processor, which, when executed by the at least one processor, enables the at least one processor to perform the control method of the power battery temperature equalization system described above.

[0060] The electronic device of this invention, by executing the above-described control method for the power battery temperature equalization system, controls the temperature equalization system based on the bus current value and the cell temperature difference of the power battery within a set time period when the power battery is discharging and has a temperature equalization requirement, so as to achieve precise regulation of the battery pack temperature and improve the thermal management efficiency of the battery system.

[0061] To achieve the above objectives, a fourth aspect of the present invention also provides a computer-readable storage medium having computer program instructions stored thereon, which, when executed by a processor, implement the control method of the power battery temperature equalization system described above.

[0062] The control method for the power battery temperature equalization system of this invention, by executing the above-described control method for the power battery temperature equalization system, controls the temperature equalization system according to the bus current value and the cell temperature difference of the power battery within a set time period when the power battery is discharging 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.

[0063] To achieve the above objectives, a fifth aspect of the present invention also provides a computer program product, which, when executed by an instruction processor, performs the above-described control method for the power battery temperature equalization system.

[0064] The computer program product of this invention executes the above-described control method for the power battery temperature equalization system. When the power battery is discharging and has a temperature equalization requirement, it controls the temperature equalization system based on the bus current value and the cell temperature difference of the power battery within a set time period, so as to achieve precise regulation of the battery pack temperature and improve the thermal management efficiency of the battery system.

[0065] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0066] 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 taken in conjunction with the accompanying drawings, wherein:

[0067] Figure 1 This is a perspective view of a power battery temperature equalization component according to the present invention;

[0068] Figure 2 This is an exploded view of a power battery temperature equalization component according to the present invention;

[0069] Figure 3 This is a cross-sectional view of the heat exchange plate of the present invention;

[0070] Figure 4 This is a schematic diagram of the heating film of the present invention;

[0071] Figure 5 This is a perspective view of another power battery temperature equalization component of the present invention;

[0072] Figure 6 This is an exploded view of another power battery temperature equalization component of the present invention;

[0073] Figure 7 This is a schematic diagram of the battery module structure of the present invention;

[0074] Figure 8 This is an exploded view of the cell and power battery temperature equalization assembly of the present invention;

[0075] Figure 9 This is a schematic diagram of the battery module (without the battery cells) of the present invention;

[0076] Figure 10 This is a schematic diagram of the battery pack structure of the present invention;

[0077] Figure 11 This is an exploded view of the battery pack of the present invention;

[0078] Figure 12 This is a schematic diagram of the battery box structure of the present invention;

[0079] Figure 13 This is a schematic diagram of the flow of the temperature equalization medium from the battery box to the temperature equalization plate of the present invention;

[0080] Figure 14 This is a schematic diagram of the liquid cooling / direct cooling medium flow at the bottom of the battery box of the present invention;

[0081] Figure 15 This is a schematic diagram of the power battery temperature equalization system of the present invention;

[0082] Figure 16 This is a low-voltage connection block diagram of the power battery temperature equalization system of the present invention;

[0083] Figure 17 This is a high-voltage connection block diagram of the power battery temperature equalization system of the present invention;

[0084] Figure 18 This is a block diagram of the water / coolant pipeline connection of the power battery equalization system of the present invention;

[0085] Figure 19 This is a flowchart of the control method for the power battery temperature equalization system of the present invention;

[0086] Figure 20 This is a flowchart of the control process of the power battery temperature equalization system of the present invention;

[0087] Figure 21 This is a block diagram of the control device for the power battery temperature equalization system of the present invention.

[0088] Explanation of reference numerals in the attached diagram: 1-heat spreader, 2-heating film, 3-insulating sheet;

[0089] 100-Power battery temperature equalization assembly, 200-End plate, 300-Battery cell, 400-Cable tie, 500-Battery box;

[0090] 11-Medium flow channel, 111-Sealed cavity, 112-Spacer bar, 113-First gap, 114-Second gap, 12-First side, 13-Second side;

[0091] 21-Heating body, 22-Wire harness, 23-Connector;

[0092] 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 Implementation

[0093] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0094] The control method, apparatus, equipment, and medium of the power battery temperature equalization system according to embodiments of the present invention are described below with reference to the accompanying drawings.

[0095] Before introducing the control method of the power battery temperature equalization system of the present invention, let's first combine... Figures 1-18 This invention introduces the power battery temperature equalization component, battery module, and battery pack.

[0096] Reference Figures 1-6 As shown, in a first aspect embodiment of the present invention, a power battery temperature equalization assembly is provided, which is placed between two battery cells along the cell height direction, and includes a temperature equalization plate 1, a heating film 2, and an insulating sheet 3, wherein:

[0097] A medium flow channel 11 is coiled inside the temperature distribution plate 1 along the length and height directions, and a heating film 2 is respectively attached to the first side 12 and the second side 13 of the temperature distribution plate 1.

[0098] The insulating sheet 3 covers and connects to the first side 12 and the second side 13, and is located between the heat spreader 1 and the battery cell.

[0099] It should be noted that the heating film 2 is attached to the first side 12 and the second side 13 of the heat exchange plate 1 respectively, and the insulating sheet 3 is covered and attached to the first side 12 and the second side 13. After the assembly of the power battery heat exchange assembly is completed, one battery cell is attached to one side of the power battery heat exchange assembly and another battery cell is attached to the other side, thereby achieving uniform temperature of the battery cells in the height direction, and at the same time, it can help achieve uniform temperature between different battery cells.

[0100] The power battery temperature equalization assembly proposed in this embodiment has a medium flow channel 11 coiled inside the temperature equalization plate 1 along the length and height directions. The first side 12 and the second side 13 of the temperature equalization plate 1 are respectively attached to the heating film 2, which can cool and heat the battery cells attached to both sides of the power battery temperature equalization assembly, avoid temperature difference in the vertical direction of the battery cells, achieve temperature equalization of the battery cells, and execute the charging and discharging strategy according to the temperature of the top of the battery cells, so as not to damage the performance and life of the battery cells.

[0101] In some embodiments, the heat spreader 1 has a sealed cavity 111 inside, and the sealed cavity 111 has a plurality of parallel spacers 112 inside. The spacers 112 extend along the length direction of the heat spreader 1, and the plurality of spacers 112 divide the sealed cavity 111 to form a medium flow channel 11. By dividing the sealed cavity 111 into a medium flow channel 11 by the plurality of spacers 112, the medium flow channel 11 is arranged to be coiled along the length and height directions, so that the medium flow is more uniform and the temperature uniformity of the battery cell is improved.

[0102] In some embodiments, among two adjacent spacers 112, one end of one spacer 112 forms a first gap 113 with the side of the sealed cavity 111, and the other spacer 112 forms a second gap 114 with the side of the sealed cavity 111 at the 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 its ends connected, resulting in more uniform medium flow and improved temperature uniformity of the battery cell.

[0103] In some embodiments, such as Figure 5 and Figure 6 As shown, the heating film 2 is attached to the top surface, first side 12, and second side 13 of the heat spreader 1. The bottom of the heating film 2 is higher than the bottom surface of the heat spreader 1. The insulating sheet 3 is fitted over the heating film 2 and is attached to the first side 12 and second side 13 of the heat spreader 1. The heating film 2 is an integral U-shaped structure. The heating film 2 is upside down on the heat spreader 1 to be attached to the top surface, first side 12, and second side 13 of the heat spreader 1. The bottom of the heating film 2 is higher than the bottom surface of the heat spreader 1. The insulating sheet 3 is fitted over the heating film 2 and is attached to the first side 12 and second side 13 of the heat spreader 1. The area of ​​the heat spreader 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 heat spreader 1, and improving the safety and reliability of the device.

[0104] In other embodiments, such as 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 glued together to fill the first side 12, and the other heating film 2 and another insulating sheet 3 are glued 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 heat spreader 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 heat spreader 1, and improving the safety and reliability of the device.

[0105] In some embodiments, the heating film 2 includes a heating body 21, two wire harnesses 22, and two connectors 23. The two wire harnesses 22 are respectively connected to both ends of the heating body 21 along its length, and the two ends of the wire harnesses 22 are respectively connected to the heating body 21 and the connectors 23. By connecting the two wire harnesses 22 to both ends of the heating body 21 along its length, and the two ends of the wire harnesses 22 are respectively connected to the heating body 21 and the connectors 23, the heating film 2 is powered on. The connectors 23 improve the convenience of powering the heating film 2 and facilitate assembly and disassembly.

[0106] The working principle of this power battery temperature equalization component is as follows: battery cells are attached to both sides of the power battery temperature equalization component. Medium flow channels 11 are arranged inside the temperature equalization plate 1 along the length and height directions. The medium in the medium flow channels 11 cools the battery cells. Heating films 2 are attached to the first side 12 and the second side 13 of the temperature equalization plate 1, respectively. The heating films 2 heat the battery cells, which can avoid temperature differences in the vertical direction of the battery cells and achieve temperature equalization of the battery cells. The charging and discharging strategy is executed according to the temperature of the top of the battery cells, which will not damage the performance and life of the battery cells.

[0107] Based on the same concept, a second aspect of the present invention proposes a battery module, combined with... Figures 7-9 As shown, the battery includes an end plate 200, a battery cell 300, and a power battery temperature equalization assembly 100. At least two rows of battery cells 300 are vertically fixed between two end plates 200. The two ends of a cable tie 400 are respectively connected to the two end plates 200 to fix the battery cells 300. The power battery temperature equalization assembly 100 is located between two adjacent rows of battery cells 300. The two ends of the temperature equalization plate 1 are respectively connected to the two end plates 200.

[0108] 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 lifespan of the battery cell 300. At the same time, the two ends of the temperature uniform plate 1 are connected to the two end plates 200 respectively, which can provide strength support for the battery module and reduce the need for external reinforcement structures such as cable ties 400. The cable ties 400 can be reduced from two to one, and the width / strength of the cable ties 400 can be reduced, which can reduce costs. In addition, the addition of the temperature uniform component can appropriately reduce the operating power of the liquid cooling / direct cooling system or shorten the operating time.

[0109] Based on the same concept, a third aspect of the present invention proposes a battery pack, combined with Figures 10-14 As shown, it includes a battery box 500 and battery cells 300, as well as a power battery temperature equalization assembly 100 in the first aspect. At least two rows of battery cells 300 are vertically fixed in the battery box 500, and at least one side of each row of battery cells 300 is in contact with the power battery temperature equalization assembly 100. The two ends of the temperature equalization plate 1 are respectively connected to the battery box 500.

[0110] It should be noted that the bottom of the battery box 500 is equipped with a liquid cooling / direct cooling channel to liquid cool and directly cool the bottom of the battery cell 300.

[0111] The battery pack provided in this embodiment can achieve temperature uniformity of the battery cells 300 and execute the charging and discharging strategy according to the top temperature of the battery cells 300, without damaging the performance and lifespan of the battery cells 300. At the same time, the two ends of the temperature uniform plate 1 are connected to the battery box 500, which can provide strength support for the battery box 500, reduce the need for reinforcement structure of the battery box 500, and reduce costs. In addition, the addition of the temperature uniform component can appropriately reduce the operating power of the liquid cooling / direct cooling system or shorten the operating time.

[0112] 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 at a distance from the bottom of the box body 510. The two ends of the longitudinal beams 540 are perpendicularly connected to the first crossbeam 520 and the second crossbeam 530, respectively, forming a square placement area for placing batteries. The two ends of the heat spreader 1 are connected to the first crossbeam 520 and the second crossbeam 530, respectively. By connecting the two ends of the heat spreader 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.

[0113] In some embodiments, the first crossbeam 520 has a first channel connecting the medium flow channel 11 inside, and the first crossbeam 520 has a medium inlet 521 and a medium outlet 522 connecting the first channel. The battery box 500 also includes a first pipe 550 and a second pipe 560. The first pipe 550 is connected to the medium inlet 521 and extends out of the box body, and the second pipe 560 is connected to the medium outlet 522 and extends out of the box body. The second crossbeam 530 has a second channel connecting the medium flow channel 11 inside, so as to form a circulating temperature equalization 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 through the medium outlet 522 and is discharged through the second pipe 560. The medium can also flow from the second channel between the medium flow channels 11 of two adjacent temperature equalization plates 1 to form a circulating temperature equalization pipeline, which can realize the temperature equalization of the battery cell 300 in the height direction, and can also assist in realizing the temperature equalization between different battery cells 300.

[0114] In some embodiments, such 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 enhance reliability and stability.

[0115] The following is combined with Figures 15-18 The present invention introduces a power battery temperature equalization system.

[0116] Figure 15 This is a schematic diagram of the power battery temperature equalization system of the present invention. (See diagram below.) 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 box (PDU), and the battery pack contains multiple temperature equalization components (each temperature equalization component consists of a battery cell, a heating film, and a temperature equalization plate), a battery management system (BMS), a battery power distribution box (BDU), and a liquid cooling / direct cooling plate. Other parts and units not directly related to the present invention are not described in detail here.

[0117] This invention adjusts the temperature difference of the battery cell body by adding a temperature equalization system (including a temperature equalization plate, a heating film, a water pump, a water tank, and related connecting pipes and connectors).

[0118] Figure 16 This is a low-voltage connection block diagram of the power battery temperature equalization system of the present invention, as shown below. Figure 16 As shown, the low-voltage connections between components mainly include low-voltage power supply, communication, and sampling.

[0119] 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 components is mainly for high-voltage power supply to transfer energy.

[0120] Figure 18This is a block diagram of the water / coolant pipeline connection of the power battery equalization system of the present invention. The water / coolant pipeline connection between the parts mainly provides a flow boundary for the cooling medium, and heat exchange occurs at the corresponding parts during the flow process.

[0121] Figure 19 This is a flowchart of the control method for the power battery temperature equalization system according to an embodiment of the present invention.

[0122] like Figure 19 As shown, the control method of the power battery temperature equalization system according to an embodiment of the present invention includes the following steps:

[0123] S1, in response to the power battery being in discharge mode, determines whether the power battery has a temperature equalization requirement.

[0124] In this step, determining whether the battery pack in the power battery has a temperature equalization requirement may include: obtaining the temperature values ​​of multiple cells in the battery pack; determining the temperature peak (highest cell temperature) and temperature trough (lowest cell temperature) from the temperature values ​​of the multiple cells; and determining whether the battery pack has a temperature equalization requirement based on the temperature peak and temperature trough. Specifically, if the temperature trough is greater than a first set temperature 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 cooling temperature equalization; if the temperature peak is less than a second set temperature 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 heating temperature equalization; if the temperature trough is less than or equal to the first set temperature value t1, and the temperature peak is greater than or equal to the second set temperature value t2, it is determined that the battery pack has no temperature equalization requirement.

[0125] S2, in response to the requirement of temperature equalization of the power battery, obtains the bus current value and the cell temperature difference of the power battery within a set time period; wherein, 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.

[0126] In this step, the difference between the peak and trough temperatures is calculated as the cell temperature difference of the power battery.

[0127] S3 controls the temperature equalization system based on the bus current value and cell temperature difference within a set time period to regulate the cell temperature.

[0128] Continue to refer to Figure 20If the bus current value I is greater than or equal to the set current value I1 (vehicle accessory power / current voltage +3~5A, where vehicle accessory power is the sum of all electrical power requirements of the vehicle excluding the drive system) within a set time period (e.g., 30s), the power level of the equalization system is first determined. Then, based on the power level of the equalization system and the cell temperature difference, the water pump and heating film in the equalization system are controlled. The water pump is used to pump the cooling medium. By adjusting the speed or flow rate of the water pump, the circulation speed of the cooling medium inside the power battery is controlled. The heating film is used to heat the cells. By adjusting the heating power of the heating film, the temperature of the cells is controlled.

[0129] 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 and the current remaining capacity value C of the battery pack are also obtained within a set time period, such as 1 minute. The bus current value is used to characterize the current value flowing through the bus connecting the battery pack with the external load or charging equipment, and the ratio RMS / C of the bus current value RMS within the set time period is calculated. Based on the ambient temperature value and the ratio RMS / C, the power level of the temperature equalization system is determined.

[0130] Example 1: The type of temperature uniformity requirement is cooling temperature uniformity requirement.

[0131] Based on the ambient temperature value T and the ratio RMS / C, determine the power rating of the temperature equalization system, including:

[0132] If the ambient temperature T is less than or equal to the third set temperature T3 (e.g., 35℃), and the ratio RMS / C is less than or equal to the first set value C4 (e.g., 1.6), then the power level of the temperature equalization system is determined to be the first power level, i.e., low-demand cooling temperature equalization condition.

[0133] If the ambient temperature T is less than or equal to the third set temperature T3, and the ratio RMS / C is greater than the first set value C4, then the compressor speed R in the power battery temperature equalization system is obtained, and the power level of the temperature equalization system is determined based on the compressor speed R.

[0134] If the ambient temperature T is less than or equal to the fourth set temperature T4 (e.g., 40℃) and greater than the third set temperature T3, and the ratio RMS / C is greater than the second set value C3 (e.g., 1.2), then 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.

[0135] When the ambient temperature 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, i.e., the high demand cooling temperature equalization condition.

[0136] The power corresponding to the first power level is less than the power corresponding to the second power level.

[0137] Based on the compressor's rotational speed R, determine the power rating of the temperature equalization system, including:

[0138] If the compressor speed R is greater than the first set speed R1, such as 3000 r / min, then the power level of the temperature equalization system is determined to be the third power level, that is, the medium demand cooling temperature equalization condition.

[0139] If the compressor speed R is less than or equal to the first set speed R1, then the power level of the temperature equalization system is determined to be the first power level, i.e., low demand cooling temperature equalization condition.

[0140] If the compressor speed R is greater than the second set speed R2, such as 5000 r / min, then the power level of the temperature equalization system is determined to be the second power level, that is, the high demand cooling temperature equalization condition.

[0141] If the compressor speed is less than or equal to the second set speed value R2, then the power level of the temperature equalization system is determined to be the third power level, that is, the medium demand cooling temperature equalization condition.

[0142] 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.

[0143] Example 2: The type of temperature equalization requirement is heating temperature equalization requirement.

[0144] Based on the ambient temperature value T and the ratio RMS / C, determine the power rating of the temperature equalization system, including:

[0145] If the ambient temperature T is greater than or equal to the fifth set temperature T2 (e.g., 0℃), and the ratio RMS / C is less than or equal to the third set temperature C2 (e.g., 1), then the power level of the equalization system is determined to be the first power level, i.e., low demand heating equalization condition.

[0146] When the ambient temperature T is greater than or equal to the fifth set temperature T2, if the ratio RMS / C is greater than the third set value C2, the compressor speed R and the heating film setting (PTC heating film setting, or PTC setting) in the power battery equalization system are obtained, and the power level of the equalization system is determined based on the compressor speed R and the heating film setting.

[0147] When the ambient temperature T is greater than or equal to the sixth set temperature T1 (e.g., -10℃) and less than the fifth set temperature T2, if the ratio is greater than the fourth set value C1 (e.g., 0.8), the compressor speed R and the heating film setting are obtained, and the power level of the temperature equalization system is determined based on the compressor speed R and the heating film setting.

[0148] When the ambient temperature T is less than the sixth set temperature T1, the power level of the equalization system is determined to be the second power level, i.e., the high demand heating equalization condition.

[0149] Based on the compressor's rotational speed R and the heating film's setting, determine the power rating of the temperature equalization system, including:

[0150] If the compressor speed R is greater than the first set speed R1 or the heating film is at the first set setting, then the power level of the equalization system is determined to be the first power level, i.e., low demand heating equalization condition.

[0151] If the compressor speed R is less than or equal to the first set speed R1 and the heating film is not at the first set setting, then the power level of the equalization system is determined to be the third power level, i.e., the medium demand heating equalization condition.

[0152] If the compressor speed R is greater than the second set speed R2 or the heating film is at the second set setting, then the power level of the equalization system is determined to be the second power level, i.e., high demand heating equalization condition.

[0153] If the compressor speed R is less than or equal to the second set speed R2 and the heating film is not in the second set setting, then the power level of the equalization system is determined to be the third power level, i.e., the medium demand heating equalization condition.

[0154] When the temperature equalization system is at the first power level, i.e., under the condition of low demand discharge temperature equalization, if the cell temperature difference Δt is less than or equal to the first set temperature difference t4, such as 10℃, then the water pump and heating film are both turned off; if the cell temperature difference Δt is greater than the first set temperature difference t4, then the thermal management working mode is obtained, and the water pump and heating film are controlled according to the thermal management working mode.

[0155] When the power level of the equalization system is the second power level, i.e., high demand discharge equalization, the thermal management operating mode is obtained, and the water pump and heating film in the equalization system are controlled according to the thermal management operating mode.

[0156] When the power level of the equalization system is the third power level, that is, when the equalization temperature is equal to the discharge temperature, if the cell temperature difference Δt is less than or equal to the second set temperature difference t3 (e.g., 8°C), the water pump and heating film are turned off; if the cell temperature difference Δt is greater than the second set temperature difference t3, the thermal management working mode is obtained, and the water pump and heating film in the equalization system are controlled according to the thermal management working mode.

[0157] Continue to refer to Figure 20As shown, when the power battery has no temperature equalization requirement, or when the bus current I is less than the set current I1 within a set time period, the cell temperature difference Δt is obtained, and the temperature equalization system is controlled according to the cell temperature Δt. If the cell temperature difference Δt is greater than the third set temperature difference t5, such as 12℃, the thermal management working mode is obtained, and the water pump and heating film are controlled according to the thermal management working mode. If the cell temperature difference Δt is less than or equal to the third set temperature difference t5, the water pump and heating film are both turned off.

[0158] In an embodiment of the present invention, the water pump and heating film in the temperature equalization system are controlled according to the thermal management working mode, including: when the thermal management working mode is cooling, controlling the water pump to turn on and the heating film to turn off; when the thermal management working mode is heating, controlling both the water pump and the heating film to turn on.

[0159] It should be noted that t3, t4, and t5 used in this invention are derived from battery simulation, testing, and performance data. Generally, t5 > t4 > t3. For example, simulation and testing data can be used to determine the approximate relationship between the maximum temperature difference between battery cells and the maximum temperature difference within the battery cell itself under different thermal management and electrical performance conditions. Based on this relationship diagram and the power performance of the battery pack / cell, corresponding t3, t4, and t5 points are selected to determine the values, such as t3 = 8℃, t4 = 10℃, and t5 = 12℃.

[0160] In summary, the control method for the power battery temperature equalization system according to embodiments of the present invention determines whether the power battery requires temperature equalization when it is in discharge mode. If it does, it acquires the bus current value and the cell temperature difference of the power battery within a set time period, and controls the temperature equalization system based on these values ​​to regulate the cell temperature. Therefore, this method, when the power battery is discharging and requires temperature equalization, controls the temperature equalization system based on the bus current value and cell temperature difference within a set time period, achieving precise temperature control of the battery pack and improving the thermal management efficiency of the battery system.

[0161] Figure 21 This is a block diagram of the control device for the power battery temperature equalization system of the present invention.

[0162] like Figure 21 As shown, the control device 1000 of the power battery temperature equalization system of the present invention includes:

[0163] The judgment module 1100 is used to determine whether the power battery has a temperature equalization requirement in response to the power battery being in the discharge mode.

[0164] The acquisition module 1200 is used to acquire the bus current value and the cell temperature difference of the power battery within a set time period in response to the requirement of temperature equalization of the power battery; wherein, 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.

[0165] The control module 1300 is used to control the temperature equalization system based on the bus current value and cell temperature difference within a set time period, so as to achieve the regulation of cell temperature.

[0166] In one embodiment of the present invention, when the control module 1300 controls the temperature equalization system based on the bus current value and the cell temperature difference within a set time period, it includes:

[0167] The power level of the temperature equalization system is determined in response to the bus current value being greater than or equal to the set current value within a set time period.

[0168] Based on the power level of the equalization system and the temperature difference of the battery cells, the water pump and heating film in the equalization system are controlled. The water pump is used to pump the cooling medium. By adjusting the speed or flow rate of the water pump, the circulation speed of the cooling medium inside the power battery is controlled. The heating film is used to heat the battery cells. By adjusting the heating power of the heating film, the heating temperature of the battery cells is controlled.

[0169] In one embodiment of the present invention, when the control module 1300 controls the water pump and heating film in the temperature equalization system according to the power level of the temperature equalization system and the cell temperature difference, it includes:

[0170] In response to the temperature equalization system being at the first power level, if the cell temperature difference is less than or equal to the first set temperature difference, the water pump and heating film will both be shut down.

[0171] In response to the temperature equalization system power level being the first power level, if the cell temperature difference is greater than the first set temperature difference, the thermal management operating mode is acquired, and the water pump and heating film are controlled according to the thermal management operating mode.

[0172] In one embodiment of the present invention, when the control module 1300 controls the water pump and heating film in the temperature equalization system according to the power level of the temperature equalization system and the cell temperature difference, it includes:

[0173] In response to the temperature equalization system being at the second power level, the thermal management operating mode is obtained, and the water pump and heating film in the temperature equalization system are controlled according to the thermal management operating mode.

[0174] The power corresponding to the first power level is less than the power corresponding to the third power level.

[0175] In one embodiment of the present invention, when the control module 1300 controls the water pump and heating film in the temperature equalization system according to the power level of the temperature equalization system and the cell temperature difference, it includes:

[0176] In response to the temperature equalization system being at the third power level, if the cell temperature difference is less than or equal to the second set temperature difference, the water pump and heating film will be shut off.

[0177] In response to the temperature equalization system being at the third power level, if the cell temperature difference is greater than the second set temperature difference, the thermal management operating mode is acquired, and the water pump and heating film in the temperature equalization system are controlled according to the thermal management operating mode.

[0178] Among them, the power corresponding to the third power level is greater than the power corresponding to the first power level and less than the power corresponding to the second power level, and the second set temperature difference is less than the first set temperature difference.

[0179] In one embodiment of the present invention, the control module 1300 is further configured to:

[0180] When there is no need for temperature equalization in the power battery, or when the bus current value is less than the set current value within a set time period, the cell temperature difference is obtained, and the temperature equalization system is controlled based on the cell temperature; among these...

[0181] If the temperature difference of the battery cells is greater than the third set temperature difference, the thermal management working mode is obtained, and the water pump and heating film are controlled according to the thermal management working mode.

[0182] If the cell temperature difference is less than or equal to the third set temperature difference, then the water pump and heating film will both be turned off.

[0183] The third set temperature difference is greater than the first set temperature difference.

[0184] In one embodiment of the present invention, when the control module 1300 controls the water pump and heating film in the temperature equalization system according to the thermal management operating mode, it includes:

[0185] In response to the thermal management operating mode being cooling, the water pump is turned on and the heating film is turned off.

[0186] In response to the thermal management operating mode being heating, both the water pump and the heating membrane are turned on.

[0187] It should be noted that for details not disclosed in the control device of the battery temperature equalization system in this embodiment of the invention, please refer to the details disclosed in the control method of the battery temperature equalization system in this embodiment of the invention, which will not be disclosed here.

[0188] The control device for the power battery temperature equalization system according to the present invention determines whether the power battery requires temperature equalization when the power battery is in discharge mode by a judgment module. When the power battery requires temperature equalization, an acquisition module acquires the bus current value and the cell temperature difference of the power battery within a set time period. The control module controls the temperature equalization system based on the bus current value and cell temperature difference within the set time period to regulate the cell temperature. Therefore, when the power battery is discharging and requires temperature equalization, this device controls the temperature equalization system based on the bus current value and cell temperature difference within a set time period to achieve precise regulation of the battery pack temperature and improve the thermal management efficiency of the battery system.

[0189] Based on the above embodiments, the present invention also proposes an electronic device.

[0190] The electronic device of this invention includes:

[0191] At least one processor; and,

[0192] A memory communicatively connected to the at least one processor; wherein,

[0193] The memory stores instructions that can be executed by the at least one processor, which, when executed by the at least one processor, enables the at least one processor to perform the control method of the power battery temperature equalization system described above.

[0194] The electronic device of this invention, by executing the above-described control method for the power battery temperature equalization system, controls the temperature equalization system based on the bus current value and the cell temperature difference of the power battery within a set time period when the power battery is discharging and has a temperature equalization requirement, so as to achieve precise regulation of the battery pack temperature and improve the thermal management efficiency of the battery system.

[0195] Based on the above embodiments, the present invention also proposes a computer-readable storage medium.

[0196] The computer-readable storage medium of this invention stores computer program instructions, which, when executed by a processor, implement the control method of the power battery temperature equalization system described above.

[0197] The control method for the power battery temperature equalization system of this invention, by executing the above-described control method for the power battery temperature equalization system, controls the temperature equalization system according to the bus current value and the cell temperature difference of the power battery within a set time period when the power battery is discharging 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.

[0198] Based on the above embodiments, the present invention also proposes a computer program product.

[0199] In an embodiment of the present invention, when the instruction processor in the computer program product is executed, the above-described control method for the power battery temperature equalization system is executed.

[0200] The computer program product of this invention executes the above-described control method for the power battery temperature equalization system. When the power battery is discharging and has a temperature equalization requirement, it controls the temperature equalization system based on the bus current value and the cell temperature difference of the power battery within a set time period, so as to achieve precise regulation of the battery pack temperature and improve the thermal management efficiency of the battery system.

[0201] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0202] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0203] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing custom logic functions or processes, and the scope of preferred embodiments of the invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of the invention pertain.

[0204] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing 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 (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs 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: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0205] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any of the following techniques known in the art, or a combination thereof: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0206] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0207] Furthermore, the functional units in the various embodiments of the present invention can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0208] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A control method for a power battery temperature equalization system, characterized in that, include: In response to the power battery being in discharge mode, determine whether the power battery has a temperature equalization requirement; In response to the requirement of temperature equalization of the power battery, the bus current value and the cell temperature difference of the power battery are obtained within a set time period; wherein, 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. The temperature equalization system is controlled based on the bus current value and the cell temperature difference within the set time period, including: determining the power level of the temperature equalization system in response to the bus current value being greater than or equal to a set current value within the set time period; controlling the water pump and heating film to shut down if the cell temperature difference is less than or equal to a first set temperature difference if the power level of the temperature equalization system is the first power level; and acquiring a thermal management operating mode and controlling the water pump and heating film according to the thermal management operating mode if the cell temperature difference is greater than the first set temperature difference if the power level of the temperature equalization system is the first power level. The process of determining the power level of the temperature equalization system includes: calculating the ratio of the bus current value to the current remaining capacity value within the set time period, and determining the power level of the temperature equalization system based on the ambient temperature value and the ratio; When the type of temperature equalization requirement is cooling temperature equalization requirement, the power level of the temperature equalization system is determined based on the ambient temperature value and the ratio, including: If the ambient temperature is less than or equal to a third set temperature, and the ratio is less than or equal to a first set value, then the power level of the temperature equalization system is determined to be the first power level. If the ambient temperature is less than or equal to a third set temperature, and the ratio is greater than the first set value, then the compressor speed in the power battery temperature equalization system is obtained, and the power level of the temperature equalization system is determined based on the compressor speed. If the ambient temperature is less than or equal to a fourth set temperature and greater than a third set temperature, and the ratio is greater than a second set value, then the compressor speed is obtained, and the power level of the temperature equalization system is determined based on the compressor speed. If the ambient temperature is greater than a fourth set temperature, then the power level of the temperature equalization system is determined to be the second power level. The power corresponding to the first power level is less than the power corresponding to the second power level. When the type of temperature equalization requirement is heating temperature equalization requirement, the power level of the temperature equalization system is determined based on the ambient temperature value and the ratio, including: If the ambient temperature is greater than or equal to the fifth set temperature, and the ratio is less than or equal to the third set temperature, the power level of the temperature equalization system is determined to be the first power level. If the ambient temperature is greater than or equal to the fifth set temperature, and the ratio is greater than the third set temperature, the compressor speed and the heating film setting in the temperature equalization component of the power battery temperature equalization system are obtained, and the power level of the temperature equalization system is determined based on the compressor speed and the heating film setting. If the ambient temperature is greater than or equal to the sixth set temperature and less than the fifth set temperature, and the ratio is greater than the fourth set temperature, the compressor speed and the heating film setting are obtained, and the power level of the temperature equalization system is determined based on the compressor speed and the heating film setting. If the ambient temperature is less than the sixth set temperature, the power level of the temperature equalization system is determined to be the second power level.

2. The method according to claim 1, characterized in that, include: In response to the temperature equalization system being at the second power level, a thermal management operating mode is obtained, and the water pump and heating film in the temperature equalization system are controlled according to the thermal management operating mode. The power corresponding to the first power level is less than the power corresponding to the third power level.

3. The method according to claim 1, characterized in that, include: In response to the temperature equalization system being at the third power level, 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 shut down. In response to the temperature equalization system power level being the third power level, if the cell temperature difference is greater than the second set temperature difference, a thermal management operating mode is obtained, and the water pump and heating film in the temperature equalization system are controlled according to the thermal management operating mode. Wherein, the power corresponding to the third power level is greater than the power corresponding to the first power level and less than the power corresponding to the second power level, and the second set temperature difference is less than the first set temperature difference.

4. The method according to claim 1, characterized in that, The method further includes: In response to the fact that the power battery has no temperature equalization requirement, or that the bus current value is less than a set current value within the set time period, the cell temperature difference is obtained, and the temperature equalization system is controlled according to the cell temperature difference; wherein, If the temperature difference of the battery cell 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. If the temperature difference of the battery cell is less than or equal to the third set temperature difference, then the water pump and the heating film are both turned off. The third set temperature difference is greater than the first set temperature difference.

5. The method according to any one of claims 1-4, characterized in that, The control of the water pump and heating film in the temperature equalization system according to the thermal management operating mode includes: In response to the thermal management operating mode being cooling, the water pump is turned on and the heating film is turned off. In response to the thermal management operating mode being heating, both the water pump and the heating film are turned on.

6. A control device for a power battery temperature equalization system, characterized in that, The control method for the power battery temperature equalization system according to any one of claims 1-5 includes: The judgment module is used to determine whether the power battery has a temperature equalization requirement in response to the power battery being in the discharge mode. The acquisition module is used to acquire the bus current value and the cell temperature difference of the power battery within a set time period in response to the requirement of temperature equalization of the power battery; wherein, 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. The control module is used to control the temperature equalization system based on the bus current value and the cell temperature difference within the set time period, so as to achieve the regulation of cell temperature.

7. 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 are executed by the at least one processor, which enable the at least one processor to perform the control method of the power battery temperature equalization system according to any one of claims 1-5.

8. A computer-readable storage medium having computer program instructions stored thereon, characterized in that, When the program instructions are executed by the processor, they implement the control method of the power battery temperature equalization system as described in any one of claims 1-5.

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