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

Abstract

The invention provides a control method, device, equipment and medium for a power battery temperature equalization system, and the method comprises the steps: judging whether a power battery has a temperature equalization demand or not under the condition that the working mode of the power battery is in a discharge mode, and controlling the temperature equalization of the power battery under the condition that the power battery has the temperature equalization demand; and acquiring a bus current value and a battery cell temperature difference of the power battery in a set time period, and controlling the temperature equalization system according to the bus current value and the battery cell temperature difference in the set time period so as to realize regulation and control of the battery cell temperature. Therefore, according to the method, when the power battery is in a discharging state and has a temperature equalization requirement, the temperature equalization system is controlled according to the bus current value and the battery cell temperature difference of the power battery in the set duration, so that accurate regulation and control of the temperature of the battery pack are realized, and the thermal management efficiency of the battery system is improved.

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 development of electric vehicles and energy storage systems, the performance, safety and service life of power batteries have become the focus of industry attention. During the discharge process of power batteries, due to the unevenness of the chemical reaction inside the battery cells and the influence of external environmental factors, inconsistent temperatures will occur between the battery cells. This temperature difference between the battery cells will not only affect the performance of the battery, accelerate the battery aging process, and shorten the battery life, but may also cause a series of safety issues, especially the risk of thermal runaway will increase significantly. Therefore, how to effectively control the temperature difference between the battery cells during the battery discharge process and improve the thermal management efficiency of the battery system is a key issue that needs to be solved urgently. 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 in discharge and there is a need for temperature equalization, the method controls the temperature equalization system according to the bus current value and the temperature difference of the power battery cells within a set time period, so as to achieve precise control of the battery pack temperature and improve 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 objective 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 purpose, an embodiment of the first aspect of the present invention proposes a control method for a power battery temperature equalization system, comprising: in response to the working mode of the power battery being in the discharge mode, judging whether the power battery has a temperature equalization requirement; in response to the power battery having a temperature equalization requirement, obtaining the bus current value within a set time period and the battery cell temperature difference of the power battery; wherein the bus current value is used to characterize the current value flowing through the bus connecting the battery pack with an external load or a charging device; and according to the bus current value within the set time period and the battery cell temperature difference, controlling the temperature equalization system to achieve regulation of the battery cell temperature.

[0009] According to the control method of the power battery temperature equalization system of the embodiment of the present invention, when the working mode of the power battery is in the discharge mode, it is determined whether the power battery has a temperature equalization requirement. When the power battery has a temperature equalization requirement, the bus current value and the battery cell temperature difference of the power battery within a set time are obtained, and the temperature equalization system is controlled according to the bus current value and the battery cell temperature difference within the set time to achieve the regulation of the battery cell temperature. Therefore, when the power battery is in the discharge state and has a temperature equalization requirement, the method controls the temperature equalization system according to the bus current value and the battery cell temperature difference of the power battery within the set time to achieve the 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 provided in the first aspect of the present invention may also have the following additional technical features:

[0011] In one embodiment of the present invention, controlling the temperature equalization system according to the bus current value and the cell temperature difference within the set time period includes:

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

[0013] The water pump and the heating film in the temperature equalization system are controlled according to the power level of the temperature equalization system and the temperature difference of the battery cell; 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 rotation speed or flow rate of the water pump; the heating film is used to heat the battery cell, and the heating power of the heating film is adjusted to control the heating temperature of the battery cell.

[0014] In one embodiment of the present invention, 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 and the temperature difference of the battery cell includes:

[0015] In response to the power level of the temperature balancing system being a first power level, if the battery cell temperature difference is less than or equal to a first set temperature difference, controlling both the water pump and the heating film to be turned off;

[0016] In response to the power level of the temperature equalization system being the first power level, if the battery 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.

[0017] In one embodiment of the present invention, 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 and the temperature difference of the battery cell includes:

[0018] In response to the power level of the temperature equalization system being the second power level, obtaining a thermal management working mode, and controlling a water pump and a heating film in the temperature equalization system 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.

[0020] In one embodiment of the present invention, 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 and the temperature difference of the battery cell includes:

[0021] In response to the power level of the temperature balancing system being the third power level, if the battery cell temperature difference is less than or equal to a second set temperature difference, controlling the water pump and the heating film to be turned off;

[0022] In response to the power level of the temperature balancing system being the third power level, if the cell temperature difference is greater than the second set temperature difference, acquiring a thermal management working mode, and controlling a water pump and a heating film in the temperature balancing system 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 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 one embodiment of the present invention, the method further comprises:

[0025] In response to the fact that the power battery has no temperature equalization requirement, or the bus current value is less than the set current value within the set time, the battery cell temperature difference is obtained, and the temperature equalization system is controlled according to the battery cell temperature; wherein,

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

[0027] If the battery cell temperature difference is less than or equal to the third set temperature difference, controlling the water pump and the heating film to be turned off;

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

[0029] In one embodiment of the present invention, controlling the water pump and the heating film in the temperature equalization system according to the thermal management working mode includes:

[0030] In response to the thermal management working mode being cooling, controlling the water pump to be turned on and the heating film to be turned off;

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

[0032] 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 judgment module, used to judge whether the power battery has a temperature equalization requirement in response to the working mode of the power battery being in the discharge mode; an acquisition module, used to obtain the bus current value and the battery cell temperature difference of the power battery within a set time period in response to the power battery having a temperature equalization requirement; wherein the bus current value is used to characterize the current value flowing through the bus connecting the battery pack with an external load or a charging device; a control module, used to control the temperature equalization system according to the bus current value and the battery cell temperature difference within the set time period, so as to achieve regulation of the battery cell temperature.

[0033] According to the control device of the power battery temperature equalization system of the present invention, when the working mode of the power battery is in the discharge mode, the judgment module determines whether the power battery has a temperature equalization requirement, and when the power battery has a temperature equalization requirement, the acquisition module obtains the bus current value and the battery cell temperature difference of the power battery within a set time, and the control module controls the temperature equalization system according to the bus current value and the battery cell temperature difference within the set time, so as to achieve the regulation of the battery cell temperature. Therefore, when the power battery is in the discharge state and has a temperature equalization requirement, the device controls the temperature equalization system according to the bus current value and the battery cell temperature difference of the power battery within the set time, so as to achieve the precise regulation of the battery pack temperature, thereby improving the thermal management efficiency of the battery system.

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

[0035] In one embodiment of the present invention, the control module is used to control the temperature equalization system according to the bus current value and the battery cell temperature difference within the set time, including:

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

[0037] The water pump and the heating film in the temperature equalization system are controlled according to the power level of the temperature equalization system and the temperature difference of the battery cell; 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 rotation speed or flow rate of the water pump; the heating film is used to heat the battery cell, and the heating power of the heating film is adjusted to control the heating temperature of the battery cell.

[0038] In one embodiment of the present invention, 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 and the temperature difference of the battery cell, including:

[0039] In response to the power level of the temperature balancing system being a first power level, if the battery cell temperature difference is less than or equal to a first set temperature difference, controlling both the water pump and the heating film to be turned off;

[0040] In response to the power level of the temperature equalization system being the first power level, if the battery 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, 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 and the temperature difference of the battery cell, including:

[0042] In response to the power level of the temperature equalization system being the second power level, obtaining a thermal management working mode, and controlling a water pump and a heating film in the temperature equalization system according to the thermal management working mode;

[0043] 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, 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 and the temperature difference of the battery cell, including:

[0045] In response to the power level of the temperature balancing system being the third power level, if the battery cell temperature difference is less than or equal to a second set temperature difference, controlling the water pump and the heating film to be turned off;

[0046] In response to the power level of the temperature balancing system being the third power level, if the cell temperature difference is greater than the second set temperature difference, acquiring a thermal management working mode, and controlling a water pump and a heating film in the temperature balancing system according to the thermal management working mode;

[0047] 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 used for:

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

[0050] If the battery cell temperature difference is greater than a 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;

[0051] If the battery cell temperature difference is less than or equal to the third set temperature difference, controlling the water pump and the heating film to be turned off;

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

[0053] In one embodiment of the present invention, the control module is used to control the water pump and the heating film in the temperature equalization system according to the thermal management working mode, including:

[0054] In response to the thermal management working mode being cooling, controlling the water pump to be turned on and the heating film to be turned off;

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

[0056] To achieve the above object, the third aspect of the present invention further provides an electronic device, including:

[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, 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.

[0060] The electronic device of the embodiment of the present invention executes the above-mentioned control method of the power battery temperature equalization system. When the power battery is in discharge and there is a need for temperature equalization, the temperature equalization system is controlled according to the bus current value and the temperature difference of the power battery cells within a set time period to achieve precise control of the battery pack temperature, thereby improving the thermal management efficiency of the battery system.

[0061] To achieve the above-mentioned purpose, the fourth aspect of the present invention further proposes a computer-readable storage medium on which computer program instructions are stored. When the program instructions are executed by a processor, the control method of the power battery temperature equalization system is implemented.

[0062] The control method of the power battery temperature equalization system of the embodiment of the present invention executes the above-mentioned control method of the power battery temperature equalization system. When the power battery is in discharge and there is a need for temperature equalization, the temperature equalization system is controlled according to the bus current value and the cell temperature difference of the power battery within a set time period to achieve precise control of the battery pack temperature, thereby improving the thermal management efficiency of the battery system.

[0063] In order to achieve the above-mentioned purpose, the fifth aspect of the present invention further proposes a computer program product, which, when the instruction processor in the computer program product is executed, executes the above-mentioned control method of the power battery temperature equalization system.

[0064] The computer program product of the embodiment of the present invention executes the above-mentioned control method of the power battery temperature equalization system. When the power battery is in discharge and there is a need for temperature equalization, the temperature equalization system is controlled according to the bus current value and the temperature difference of the power battery cells within a set time period to achieve precise control of the battery pack temperature, thereby improving the thermal management efficiency of the battery system.

[0065] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0067] Figure 1 It is a three-dimensional diagram of a power battery temperature equalizing assembly of the present invention;

[0068] Figure 2 It is an exploded view of a power battery temperature equalizing assembly of the present invention;

[0069] Figure 3 is a cross-sectional view of a temperature homogenizing plate of the present invention;

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

[0071] Figure 5 is a three-dimensional diagram of another power battery temperature equalizing assembly of the present invention;

[0072] Figure 6 is an exploded view of another power battery temperature equalizing assembly of the present invention;

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

[0074] Figure 8 It is an exploded diagram of the battery cell and the power battery temperature equalizing assembly of the present invention;

[0075] Fig. 9 It is a schematic diagram of the structure of the battery module of the present invention (without the battery core);

[0076] Fig.10 is a schematic structural diagram of a battery pack of the present invention;

[0077] Fig.11 is an exploded view of the battery pack of the present invention;

[0078] Fig.12 It is a structural schematic diagram of the battery box of the present invention;

[0079] Fig.13 It is a schematic diagram of the flow of the temperature-equalizing medium from the battery box to the temperature-equalizing plate of the present invention;

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

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

[0082] Fig.16 It is a low voltage connection block diagram of the power battery temperature equalization system of the present invention;

[0083] Fig.17 It is a high voltage connection block diagram of the power battery temperature equalization system of the present invention;

[0084] Fig.18 This is a water circuit / refrigerant pipeline connection block diagram of the power battery temperature equalization system of the present invention;

[0085] Fig.19 is a flow chart of a control method of a power battery temperature equalization system of the present invention;

[0086] Fig. 20 is a flow chart of the control process of the power battery temperature equalization system of the present invention;

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

[0088] Description of reference numerals: 1-temperature averaging plate, 2-heating film, 3-insulating sheet;

[0089] 100-power battery temperature equalizing assembly, 200-end plate, 300-battery cell, 400-cable tie, 500-battery box;

[0090] 11- medium flow channel, 111- sealing cavity, 112- spacer, 113- first gap, 114- second gap, 12- first side surface, 13- second side surface;

[0091] 21-heating body, 22-wiring harness, 23-connector;

[0092] 510 - box body, 520 - first cross beam, 521 - medium inlet, 522 - medium outlet, 530 - second cross beam, 540 - longitudinal beam, 550 - first pipeline, 560 - second pipeline. DETAILED DESCRIPTION

[0093] Embodiments of the present invention are described in detail below, 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 should not be construed as limiting the present invention.

[0094] The following describes a control method, device, equipment and medium for a power battery temperature equalization system according to an embodiment of the present invention with reference to the accompanying drawings.

[0095] Before introducing the control method of the power battery temperature equalization system of the present invention, Figure 1-Figure 18 The power battery temperature equalizing assembly, battery module and battery pack of the present invention are introduced.

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

[0097] A medium flow channel 11 is arranged in a winding manner along the length direction and the height direction inside the temperature averaging plate 1, and a heating film 2 is respectively attached to the first side surface 12 and the second side surface 13 of the temperature averaging plate 1;

[0098] 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 averaging plate 1 and the battery cell.

[0099] It should be noted that the first side 12 and the second side 13 of the temperature equalizing plate 1 are respectively bonded and connected 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 bonded to a battery cell, and the other side is bonded 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.

[0100] The power battery temperature equalizing assembly proposed in this embodiment is provided with a medium flow channel 11 coiled along the length direction and the height direction inside the temperature equalizing plate 1, and the first side surface 12 and the second side surface 13 of the temperature equalizing plate 1 are respectively bonded and connected with a heating film 2, so that the battery cells bonded on both sides of the power battery temperature equalizing assembly can be cooled and heated to avoid temperature difference of the battery cells in the vertical direction, achieve temperature equalization of the battery cells, and execute the charging and discharging strategy according to the top temperature of the battery cells, without damaging the performance and life of the battery cells.

[0101] In some embodiments, a sealed cavity 111 is provided inside the temperature equalizer 1, and a plurality of parallel partitions 112 are provided inside the sealed cavity 111, and the partitions 112 extend along the length direction of the temperature equalizer 1, and the plurality of partitions 112 separate the sealed cavity 111 to form a medium flow channel 11. The sealed cavity 111 is separated by a plurality of partitions 112 to form a medium flow channel 11, so that the medium flow channel 11 is arranged in a winding manner along the length direction and the height direction, so that the medium flows more evenly, and the temperature equalization effect on the battery cell is improved.

[0102] In some embodiments, two adjacent spacers 112, one end of one spacer 112 and the side of the sealed cavity 111 form a first gap 113, 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, and the cross section of the medium flow channel 11 is S-shaped. Through the above structure, the medium flow channel 11 can form a "snake" shape connected end to end, the medium flow is more uniform, and the temperature equalization effect of the battery cell can be improved.

[0103] In some embodiments, Figure 5 and Figure 6 As shown, the heating film 2 is attached to the top surface, the first side surface 12 and the second side surface 13 of the temperature averaging plate 1, the bottom of the heating film 2 is higher than the bottom surface of the temperature averaging plate 1, and the insulating sheet 3 is attached to the outside of the heating film 2 and attached to the first side surface 12 and the second side surface 13 of the temperature averaging plate 1. The heating film 2 is an integrated U-shaped structure, and the heating film 2 is inverted on the temperature averaging plate 1 to be attached to the top surface, the first side surface 12 and the second side surface 13 of the temperature averaging plate 1, the bottom of the heating film 2 is higher than the bottom surface of the temperature averaging plate 1, and the insulating sheet 3 is attached to the outside of the heating film 2 and attached to the first side surface 12 and the second side surface 13 of the temperature averaging plate 1. The area of ​​the temperature averaging plate 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 averaging plate 1, thereby improving the safety and reliability of the device.

[0104] 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 to fill the first side 12, and another heating film 2 and another insulating sheet 3 are pasted to fill the first side 12 and the second side 13, and the insulating sheet 3 is located below the heating film 2. The first side 12 and the second side 13 are filled by piecing together the heating film 2 and the insulating sheet 3, and the insulating sheet 3 is located below the heating film 2, and the area of ​​the temperature averaging plate 1 not covered by the heating film 2 is covered by the insulating sheet 3, so as to avoid the risk of short circuit between the battery cell and the temperature averaging plate 1, and improve the safety and reliability of the device.

[0105] 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 two ends of the length direction of the heating body 21, and the two 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 two ends of the length direction of the heating body 21, and the two 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 setting of the connectors 23 improves the convenience of connecting the heating film 2 to electricity, and is convenient for assembly and disassembly.

[0106] 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, a medium flow channel 11 is arranged in a winding manner along the length direction and the height direction inside the temperature equalizing plate 1, and the battery cell is cooled by the medium in the medium flow channel 11. The first side surface 12 and the second side surface 13 of the temperature equalizing plate 1 are respectively attached and connected with a heating film 2. The battery cell is heated by the heating film 2, which can avoid temperature difference in the battery cell in the vertical direction, realize temperature equalization of the battery cell, and execute the charging and discharging strategy according to the top temperature of the battery cell, without damaging the performance and life of the battery cell.

[0107] 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 an end plate 200, a battery cell 300 and a 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 cell 300 is 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.

[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 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 changed 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.

[0109] Based on the same concept, the third aspect of the present invention provides a battery pack, combined with Figure 10-14 As shown, it includes a battery box 500 and 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 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.

[0110] 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.

[0111] The battery pack provided 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 battery box 500, which can provide strength support for the battery box 500, reduce the reinforcement structure of the battery box 500, and 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.

[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 intervals at the bottom of the box body 510. The two ends of the longitudinal beam 540 are respectively connected to the first crossbeam 520 and the second crossbeam 530 vertically to form a square placement area for placing batteries. The two ends of the temperature plate 1 are respectively connected to the first crossbeam 520 and the second crossbeam 530. By connecting the two ends of the temperature plate 1 to the first crossbeam 520 and the second crossbeam 530, strength support is provided for the battery box 500, which can reduce the reinforcement structure of the battery box 500 and reduce costs.

[0113] In some embodiments, a first channel connected to the medium flow channel 11 is provided inside the first crossbeam 520, and 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 also 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 inside 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, flows out of the medium outlet 522 with the second pipe 560 and is discharged. The medium can also circulate between the medium flow channels 11 of two adjacent temperature-averaging plates 1 from the second channel to form a circulating temperature-averaging pipeline, which can achieve temperature-averaging of the battery cell 300 in the height direction, and can also assist in achieving temperature-averaging between different battery cells 300.

[0114] In some embodiments, Fig.14 As shown, the liquid cooling / direct cooling channel at the bottom of the battery box 500 may also be S-shaped similar to the medium channel 11, which can improve the uniformity of cooling and improve reliability and stability.

[0115] Combine the following Figure 15-18 The power battery temperature equalization system of the present invention is introduced.

[0116] Fig.15 Schematic diagram of the power battery temperature equalization system of the present invention. Fig.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 distribution box PDU, and the battery pack contains multiple temperature equalization components (the temperature equalization components are composed of battery cells, heating films, and temperature equalization plates), a battery management system BMS, a battery distribution box BDU, and a liquid cooling / direct cooling plate. Other parts and units that are not directly related to the present invention are not described here.

[0117] 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).

[0118] Fig.16 is a low voltage connection block diagram of the power battery temperature equalization system of the present invention, such as Fig.16 As shown, the low-voltage connections between parts mainly include low-voltage power supply, communication, sampling, etc.

[0119] Fig.17 It 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.

[0120] Fig.18It is a block diagram of the water circuit / refrigerant pipeline connection of the power battery temperature equalization system of the present invention. The water circuit / refrigerant pipeline connection between the parts is mainly to provide a flow boundary for the cooling medium. During the flow process, heat exchange is performed at the corresponding parts positions.

[0121] Fig.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.

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

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

[0124] In this step, the process of determining whether the battery pack in the power battery has a uniform temperature requirement may include: obtaining the temperature values ​​of multiple cells in the battery pack; determining the temperature peak (the highest temperature of the cell) and the temperature valley (the lowest temperature of the cell) from the temperature values ​​of the multiple cells; judging whether the battery pack has a uniform temperature requirement based on the temperature peak and the temperature valley. Wherein, when the temperature valley is greater than the first set temperature value t1, such as 45°C, it is determined that the battery pack has a uniform temperature requirement, and the type of the uniform temperature requirement is a cooling uniform temperature requirement; when the temperature peak is less than the second set temperature value t2, such as 0°C, it is determined that the battery pack has a uniform temperature requirement, and the type of the uniform temperature requirement is a heating uniform temperature requirement; when the temperature valley 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 uniform temperature requirement.

[0125] S2, in response to the power battery having a temperature equalization requirement, obtain 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 device.

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

[0127] S3, according to the bus current value and the battery cell temperature difference within the set time, the temperature equalization system is controlled to achieve regulation of the battery cell temperature.

[0128] Continue to refer Fig. 20, when the bus current value I is greater than or equal to the set current value I1 (vehicle accessory power / current voltage + 3~5A, the vehicle accessory power is the sum of all power demands of the vehicle except the drive system) within a set time (such as 30s), first determine the power level of the temperature equalization system, and then 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 cell; wherein, the water pump is used to pump the cooling medium, and the circulation speed of the cooling medium in the power battery is controlled by adjusting the speed or flow of the water pump, and the heating film is used to heat the battery cell, and the heating power of the heating film is adjusted to control the heating temperature of the battery cell.

[0129] Among them, 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 period 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 period 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.

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

[0131] According to the ambient temperature value T and the ratio RMS / C, the power level of the temperature equalization system is determined, including:

[0132] 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 equalization system is determined to be the first power level, that is, the low demand cooling temperature equalization working condition;

[0133] 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 according to the speed value R of the compressor;

[0134] When the ambient temperature value T is less than or equal to the fourth set temperature T4, such as 40° C., and greater than the third set temperature value T3, if the ratio RMS / C is greater than the second set value C3, such as 1.2, the speed value R of the compressor is obtained, and the power level of the temperature equalization system is determined according to the speed value R of the compressor;

[0135] 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;

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

[0137] According to the speed value R of the compressor, the power level of the temperature equalization system is determined, including:

[0138] If the speed value R of the compressor is greater than the first set speed value R1, such as 3000r / 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;

[0139] 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;

[0140] If the speed value R of the compressor is greater than the second set speed value R2, such as 5000r / 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;

[0141] 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;

[0142] The power corresponding to the first power level is smaller than the power corresponding to the third power level, and the power corresponding to the third power level is smaller than the power corresponding to the second power level.

[0143] Example 2: The type of average temperature demand is heating average temperature demand.

[0144] According to the ambient temperature value T and the ratio RMS / C, the power level of the temperature equalization system is determined, including:

[0145] 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;

[0146] 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 component (the gear position of the PTC heating film, referred to as the PTC gear position) 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;

[0147] 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;

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

[0149] According to the speed value R of the compressor and the gear position of the heating film, the power level of the temperature equalization system is determined, including:

[0150] 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;

[0151] 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;

[0152] 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;

[0153] 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.

[0154] When the power level of the temperature equalization system is the first power level, that is, the low-demand discharge average temperature, if the battery cell temperature difference △t is less than or equal to the first set temperature difference t4, such as 10°C, the water pump and the heating film are controlled to be turned off; if the battery cell temperature difference △t is greater than the first set temperature difference t4, the thermal management working mode is obtained, and the water pump and the heating film are controlled according to the thermal management working mode.

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

[0156] When the power level of the temperature equalization system is the third power level, that is, when the discharge temperature is required to be averaged, if the battery cell temperature difference △t is less than or equal to the second set temperature difference t3, such as 8°C, the water pump and the heating film are controlled to be turned off; if the battery cell temperature difference △t is greater than the second set temperature difference t3, the thermal management working mode is obtained, and according to the thermal management working mode, the water pump and the heating film in the temperature equalization system are controlled.

[0157] Continue to refer Fig. 20, as shown, when there is no temperature equalization requirement for the power battery, or the bus current I is less than the set current I1 within the set time, the battery cell temperature difference △t is obtained, and the temperature equalization system is controlled according to the battery cell temperature △t; wherein, if the battery cell temperature difference △t is greater than the third set temperature difference t5 such as 12°C, 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 battery cell temperature difference △t is less than or equal to the third set temperature difference t5, the water pump and the heating film are controlled to be closed.

[0158] In an embodiment of the present invention, the water pump and the 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, the water pump is controlled to be turned on and the heating film is turned off; when the thermal management working mode is heating, both the water pump and the heating film are controlled to be turned on.

[0159] It should be noted that t3, t4, and t5 used in the present invention are comprehensively derived based on the simulation, testing, and performance of the battery. Under normal circumstances: t5>t4>t3. For example, through simulation and test data, the approximate relationship between the maximum temperature difference between the 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 t3, t4, and t5 points are selected to determine the values, such as t3=8°C, t4=10°C, and t5=12°C.

[0160] In summary, according to the control method of the power battery temperature equalization system according to the embodiment of the present invention, when the working mode of the power battery is in the discharge mode, it is determined whether the power battery has a temperature equalization requirement. When the power battery has a temperature equalization requirement, the bus current value within the set time and the battery cell temperature difference of the power battery are obtained, and the temperature equalization system is controlled according to the bus current value and the battery cell temperature difference within the set time to achieve the regulation of the battery cell temperature. Therefore, when the power battery is in the discharge state and has a temperature equalization requirement, the method controls the temperature equalization system according to the bus current value within the set time and the battery cell temperature difference of the power battery to achieve the precise regulation of the battery pack temperature, thereby improving the thermal management efficiency of the battery system.

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

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

[0163] A determination module 1100 is used to determine whether the power battery has a temperature equalization requirement in response to the working mode of the power battery being in a discharge mode;

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

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

[0166] In one embodiment of the present invention, the control module 1300 is used to control the temperature equalization system according to the bus current value and the cell temperature difference within a set time, including:

[0167] In response to the bus current value being greater than or equal to the set current value within the set time period, determining the power level of the temperature equalization system;

[0168] The water pump and heating film in the temperature equalization system are controlled according to the power level of the temperature equalization system and the temperature difference of the battery cells. 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 of the water pump. The heating film is used to heat the battery cells, and the heating power of the heating film is adjusted to control the heating temperature of the battery cells.

[0169] In one embodiment of the present invention, 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 and the temperature difference of the battery cell, including:

[0170] In response to the power level of the temperature averaging system being the first power level, if the cell temperature difference is less than or equal to the first set temperature difference, controlling the water pump and the heating film to be turned off;

[0171] In response to the power level of the temperature balancing system being the first power level, if the temperature difference of the battery cells is greater than the 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.

[0172] In one embodiment of the present invention, 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 and the temperature difference of the battery cell, including:

[0173] In response to the power level of the temperature equalization system being the second power level, obtaining a thermal management working mode, and controlling a water pump and a heating film in the temperature equalization system according to the thermal management working 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, 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 and the temperature difference of the battery cell, including:

[0176] In response to the power level of the temperature averaging system being the third power level, if the cell temperature difference is less than or equal to the second set temperature difference, controlling the water pump and the heating film to be turned off;

[0177] In response to the power level of the temperature averaging system being the third power level, if the cell temperature difference is greater than the second set temperature difference, a thermal management working mode is acquired, and a water pump and a heating film in the temperature averaging system are controlled according to the thermal management working mode;

[0178] 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 equalizing the temperature of the power battery, or when the bus current value is less than the set current value within the set time, the temperature difference of the battery cell is obtained, and the equalizing temperature system is controlled according to the battery cell temperature; wherein,

[0181] If the cell temperature difference 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;

[0182] If the 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 turned off;

[0183] Among them, the third set temperature difference is greater than the first set temperature difference.

[0184] In one embodiment of the present invention, the control module 1300 is used to control the water pump and the heating film in the temperature equalization system according to the thermal management working mode, including:

[0185] In response to the thermal management working mode being cooling, the water pump is controlled to be turned on and the heating film is turned off;

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

[0187] 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.

[0188] According to the control device of the power battery temperature equalization system of the present invention, when the working mode of the power battery is in the discharge mode, the judgment module determines whether the power battery has a temperature equalization requirement, and when the power battery has a temperature equalization requirement, the acquisition module obtains the bus current value and the battery cell temperature difference of the power battery within a set time, and the control module controls the temperature equalization system according to the bus current value and the battery cell temperature difference within the set time, so as to achieve the regulation of the battery cell temperature. Therefore, when the power battery is in the discharge state and has a temperature equalization requirement, the device controls the temperature equalization system according to the bus current value and the battery cell temperature difference of the power battery within the set time, so as to achieve the precise regulation of the battery pack temperature, thereby improving the thermal management efficiency of the battery system.

[0189] Based on the above embodiments, the present invention further provides an electronic device.

[0190] An electronic device according to an embodiment of the present 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, 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.

[0194] The electronic device of the embodiment of the present invention executes the above-mentioned control method of the power battery temperature equalization system. When the power battery is in discharge and there is a need for temperature equalization, the temperature equalization system is controlled according to the bus current value and the temperature difference of the power battery cells within a set time period to achieve precise control of the battery pack temperature, thereby improving 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 the embodiment of the present invention stores computer program instructions, and when the program instructions are executed by a processor, the control method of the power battery temperature equalization system described above is implemented.

[0197] The control method of the power battery temperature equalization system of the embodiment of the present invention executes the above-mentioned control method of the power battery temperature equalization system. When the power battery is in discharge and there is a need for temperature equalization, the temperature equalization system is controlled according to the bus current value and the cell temperature difference of the power battery within a set time period to achieve precise control of the battery pack temperature, thereby improving 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-mentioned control method of the power battery temperature equalization system is executed.

[0200] The computer program product of the embodiment of the present invention executes the above-mentioned control method of the power battery temperature equalization system. When the power battery is in discharge and there is a need for temperature equalization, the temperature equalization system is controlled according to the bus current value and the temperature difference of the power battery cells within a set time period to achieve precise control of the battery pack temperature, thereby improving the thermal management efficiency of the battery system.

[0201] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means 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 may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0202] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0203] 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 not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present invention belong.

[0204] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute the instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, 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 in other suitable ways if necessary, and then stored in a computer memory.

[0205] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0206] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0207] In addition, each functional unit in each embodiment of the present invention may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0208] 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 can be understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. A person of ordinary skill in the art may change, modify, replace and modify 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 working mode of the power battery being in the 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 and a cell temperature difference of the power battery within a set time period; wherein the bus current value is used to characterize a current value flowing through a bus connecting the battery pack and an external load or a charging device; The temperature equalization system is controlled according to the bus current value and the battery cell temperature difference within the set time period to achieve regulation of the battery cell temperature.

2. The method according to claim 1, characterized in that The controlling the temperature equalization system according to the bus current value and the cell temperature difference within the set time period includes: In response to the bus current value being greater than or equal to the set current value within the set time period, determining the power level of the temperature equalization system; The water pump and the heating film in the temperature equalization system are controlled according to the power level of the temperature equalization system and the temperature difference of the battery cell; 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 rotation speed or flow rate of the water pump; the heating film is used to heat the battery cell, and the heating power of the heating film is adjusted to control the heating temperature of the battery cell.

3. The method according to claim 2, characterized in that 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 and the temperature difference of the battery cell includes: In response to the power level of the temperature balancing system being a first power level, if the battery cell temperature difference is less than or equal to a 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 equalization system being the first power level, if the battery 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.

4. The method according to claim 2, characterized in that: 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 and the temperature difference of the battery cell includes: In response to the power level of the temperature equalization system being the second power level, obtaining a thermal management working mode, and controlling a water pump and a heating film in the temperature equalization system according to the thermal management working mode; The power corresponding to the first power level is less than the power corresponding to the third power level.

5. The method according to claim 2, characterized in that: 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 and the temperature difference of the battery cell includes: In response to the power level of the temperature balancing system being the third power level, if the battery cell temperature difference is less than or equal to a second set temperature difference, controlling the water pump and the heating film to be turned off; In response to the power level of the temperature averaging system being the third power level, if the cell temperature difference is greater than the second set temperature difference, acquiring a thermal management working mode, and controlling a water pump and a heating film in the temperature averaging system according to the thermal management working mode; 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.

6. The method according to claim 2, characterized in that The method further comprises: In response to the fact that the power battery has no temperature equalization requirement, or the bus current value is less than the set current value within the set time, the battery cell temperature difference is obtained, and the temperature equalization system is controlled according to the battery cell temperature; wherein, If the battery cell temperature difference is greater than a 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; If the battery cell temperature difference is less than or equal to the third set temperature difference, controlling the water pump and the heating film to be turned off; Wherein, the third set temperature difference is greater than the first set temperature difference.

7. The method according to any one of claims 3 to 6, characterized in that: According to the thermal management working mode, controlling the water pump and the heating film in the temperature equalization system includes: In response to the thermal management working mode being cooling, controlling the water pump to be turned on and the heating film to be turned off; In response to the thermal management operation mode being heating, the water pump and the heating film are both controlled to be turned on.

8. A control device for a power battery temperature equalization system, characterized in that: include: a judgment module, configured to judge whether the power battery has a temperature equalization requirement in response to the operating mode of 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 a temperature equalization requirement of the power battery; wherein the bus current value is used to characterize a current value flowing through a bus connecting the battery pack and an external load or a charging device; The control module is used to control the temperature equalization system according to the bus current value and the battery cell temperature difference within the set time period to achieve regulation of the battery cell temperature.

9. 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 equalization system according to any one of claims 1 to 7.

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

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