Control methods, devices, equipment and media for power battery temperature equalization systems

Abstract

This invention proposes a control method, device, equipment, and medium for a power battery temperature equalization system. The system includes multiple temperature equalization components placed between two cells along their height. When the battery pack requires temperature equalization, the system acquires the ambient temperature, the bus current value within a set time period, and the current remaining capacity of the battery pack. Based on these factors, the power level of the temperature equalization system is determined. Then, the temperature equalization components are controlled according to the determined power level to regulate the battery pack temperature. This method determines the power level of the temperature equalization system by comprehensively considering multiple factors such as the ambient temperature, the bus current value within a set time period, and the current remaining capacity of the battery pack, and controls the temperature equalization components accordingly to achieve precise temperature control of the battery pack.

Description

Technical Field

[0001] This invention relates to the field of power battery technology, and in particular to a control method, device, equipment and medium for a power battery temperature equalization system. Background Technology

[0002] With the rapid development of electric vehicles and energy storage systems, the performance and safety of power batteries have become a key focus of the industry. During the charging and discharging process, temperature differences arise between battery cells due to the unevenness of internal chemical reactions and the influence of external environmental factors. These temperature differences not only affect battery performance and shorten battery life but may also trigger safety issues such as thermal runaway. Therefore, the research and application of power battery temperature equalization systems are of paramount importance. Summary of the Invention

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

[0004] Therefore, the first objective of this invention is to propose a control method for a power battery temperature equalization system. This method determines the power level of the temperature equalization system by comprehensively considering multiple factors such as ambient temperature, bus current within a set time period, and the current remaining capacity of the battery pack, and controls the temperature equalization components according to the determined power level to achieve precise regulation of the battery pack temperature.

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

[0006] The third objective of this invention is to provide an electronic device.

[0007] The fourth objective of this invention is to provide a computer-readable storage medium.

[0008] To achieve the above objectives, a first aspect of the present invention provides a control method for a power battery temperature equalization system. The power battery temperature equalization system includes multiple temperature equalization components, which are placed between two battery cells along the cell height direction. The method includes: in response to a temperature equalization requirement in the battery pack of the power battery, acquiring an ambient temperature value, a bus current value within a set time period, and the current remaining capacity value of the battery pack; 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; determining the power level of the temperature equalization system based on the ambient temperature value, the bus current value within the set time period, and the current remaining capacity value; and controlling the temperature equalization components according to the determined power level to achieve temperature regulation of the battery pack.

[0009] The power battery temperature equalization system according to an embodiment of the present invention includes multiple temperature equalization components, which are placed between two cells along the height direction of the cells. When the battery pack in the power battery has a temperature equalization requirement, the system acquires the ambient temperature value, the bus current value within a set time period, and the current remaining capacity value of the battery pack. 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. Based on the ambient temperature value, the bus current value within the set time period, and the current remaining capacity value, the power level of the temperature equalization system is determined. Then, based on the determined power level, the temperature equalization components are controlled to achieve temperature regulation of the battery pack. Thus, this method determines the power level of the temperature equalization system by comprehensively considering multiple factors such as the ambient temperature value, the bus current value within a set time period, and the current remaining capacity value of the battery pack, and controls the temperature equalization components according to the determined power level to achieve precise temperature regulation of the battery pack.

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

[0011] According to one embodiment of the present invention, the method further includes:

[0012] Obtain the temperature values ​​of multiple cells in the battery pack;

[0013] From the temperature values ​​of the multiple battery cells, determine the temperature peak and temperature valley values;

[0014] Based on the temperature peak and temperature trough values, determine whether the battery pack requires temperature equalization.

[0015] Wherein, in response to the temperature valley value being greater than the first set temperature value, it is determined that the battery pack has a temperature equalization requirement, and the type of temperature equalization requirement is a cooling temperature equalization requirement.

[0016] In response to the peak temperature being less than the second set temperature value, it is determined that the battery pack has a temperature equalization requirement, and the type of temperature equalization requirement is a heating temperature equalization requirement.

[0017] In response to the temperature valley value being less than or equal to the first set temperature value and the temperature peak value being greater than or equal to the second set temperature value, it is determined that the battery pack has no temperature equalization requirement;

[0018] Wherein, the first set temperature value is greater than the second set temperature value.

[0019] According to an embodiment of the present invention, determining the power level of the temperature equalization system based on the ambient temperature value, the bus current value within the set time period, and the current remaining capacity value includes:

[0020] Calculate the root mean square value of the bus current within the set time period;

[0021] Calculate the ratio between the root mean square value and the current remaining capacity value;

[0022] The power rating of the temperature equalization system is determined based on the ambient temperature value and the ratio.

[0023] According to one embodiment of the present invention, the type of temperature equalization requirement is cooling temperature equalization requirement, and determining the power level of the temperature equalization system based on the ambient temperature value and the ratio includes:

[0024] In response to the ambient temperature value being less than or equal to a third set temperature value, if 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 a first power level;

[0025] In response to the ambient temperature value being less than or equal to the third set temperature value, if the set ratio value is greater than the first set value, the rotational speed value of the compressor in the power battery temperature equalization system is obtained, and the power level of the temperature equalization system is determined based on the rotational speed value of the compressor.

[0026] In response to the ambient temperature value being less than or equal to the fourth set temperature and greater than the third set temperature value, if the ratio is greater than the second set value, the compressor speed value is obtained, and the power level of the temperature equalization system is determined based on the compressor speed value.

[0027] In response to the ambient temperature value being greater than the fourth set temperature, the power level of the temperature equalization system is determined to be the second power level;

[0028] Wherein, the power corresponding to the first power level is less than the power corresponding to the second power level.

[0029] According to one embodiment of the present invention, determining the power rating of the temperature equalization system based on the compressor speed includes:

[0030] If the compressor speed is greater than the first set speed, then the power level of the temperature equalization system is determined to be the third power level.

[0031] If the compressor speed is less than or equal to the first set speed, then the power level of the temperature equalization system is determined to be the first power level.

[0032] If the compressor speed is greater than the second set speed, then the power level of the temperature equalization system is determined to be the second power level.

[0033] If the compressor's rotational speed is less than or equal to the second set rotational speed, then the power level of the temperature equalization system is determined to be the third power level.

[0034] Wherein, the power corresponding to the first power level is less than the power corresponding to the third power level, and the power corresponding to the third power level is less than the power corresponding to the second power level.

[0035] According to one embodiment of the present invention, the type of temperature equalization requirement is heating temperature equalization requirement, and determining the power level of the temperature equalization system based on the ambient temperature value and the ratio includes:

[0036] In response to the ambient temperature value being greater than or equal to a fifth set temperature value, if the ratio is less than or equal to a third set value, then the power level of the temperature equalization system is determined to be a fourth power level.

[0037] In response to the ambient temperature value being greater than or equal to the fifth set temperature value, if the ratio is greater than the third set value, the speed value of the compressor in the power battery equalization system and the setting of the heating film in the equalization component are obtained, and the power level of the equalization system is determined based on the speed value of the compressor and the setting of the heating film.

[0038] In response to the ambient temperature value being greater than or equal to the sixth set temperature and less than the fifth set temperature value, if the ratio is greater than the fourth set value, the compressor speed value and the heating film setting are obtained, and the power level of the temperature equalization system is determined based on the compressor speed value and the heating film setting.

[0039] In response to the ambient temperature value being less than the sixth set temperature T1, the power level of the temperature equalization system is determined to be the fifth power level;

[0040] The power corresponding to the fourth power level is less than the power corresponding to the fifth power level.

[0041] According to one embodiment of the present invention, determining the power level of the temperature equalization system based on the compressor speed and the setting of the heating film includes:

[0042] If the compressor speed is greater than the first set speed or the heating film is at the first set setting, then the power level of the temperature equalization system is determined to be the fourth power level.

[0043] If the compressor speed is less than or equal to the first set speed and the heating film is not at the first set setting, then the power level of the temperature equalization system is determined to be the sixth power level.

[0044] If the compressor speed is greater than the second set speed or the heating film is at the second set setting, then the power level of the temperature equalization system is determined to be the fifth power level.

[0045] If the compressor speed is less than or equal to the second set speed and the heating film is not in the second set setting, then the power level of the temperature equalization system is determined to be the sixth power level.

[0046] The power corresponding to the fourth power level is less than the power corresponding to the sixth power level, and the power corresponding to the sixth power level is less than the power corresponding to the fifth power level.

[0047] To achieve the above objectives, a second aspect of the present invention provides a control device for a power battery temperature equalization system. The power battery temperature equalization system includes multiple temperature equalization components, which are placed between two battery cells along the cell height direction. The device includes: an acquisition module, used to acquire an ambient temperature value, a bus current value within a set time period, and the current remaining capacity value of the battery pack in response to a temperature equalization requirement in the battery pack; wherein the bus current value is used to characterize the current flowing through the bus connecting the battery pack to an external load or charging device; a determination module, used to determine the power level of the temperature equalization system based on the ambient temperature value, the bus current value within the set time period, and the current remaining capacity value; and a control module, used to control the temperature equalization components according to the determined power level to regulate the temperature of the battery pack.

[0048] According to an embodiment of the present invention, the control device for a power battery temperature equalization system acquires, via an acquisition module, ambient temperature, bus current within a set time period, and the current remaining capacity of the battery pack when temperature equalization is required in the power battery pack. The bus current represents the current flowing through the bus connecting the battery pack to an external load or charging device. A determination module determines the power level of the temperature equalization system based on the ambient temperature, bus current within the set time period, and the current remaining capacity. A control module controls the temperature equalization components according to the determined power level to regulate the battery pack temperature. Thus, this device determines the power level of the temperature equalization system by comprehensively considering multiple factors such as ambient temperature, bus current within a set time period, and the current remaining capacity of the battery pack, and controls the temperature equalization components according to the determined power level to achieve precise temperature control of the battery pack.

[0049] 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:

[0050] According to one embodiment of the present invention, the device further includes:

[0051] The judgment module is used to obtain the temperature values ​​of multiple cells in the battery pack, and determine the temperature peak and temperature valley values ​​from the temperature values ​​of the multiple cells, and determine whether the battery pack has a temperature equalization requirement based on the temperature peak and temperature valley values.

[0052] Wherein, in response to the temperature valley value being greater than the first set temperature value, it is determined that the battery pack has a temperature equalization requirement, and the type of temperature equalization requirement is a cooling temperature equalization requirement.

[0053] In response to the peak temperature being less than the second set temperature value, it is determined that the battery pack has a temperature equalization requirement, and the type of temperature equalization requirement is a heating temperature equalization requirement.

[0054] In response to the temperature valley value being less than or equal to the first set temperature value and the temperature peak value being greater than or equal to the second set temperature value, it is determined that the battery pack has no temperature equalization requirement;

[0055] Wherein, the first set temperature value is greater than the second set temperature value.

[0056] According to an embodiment of the present invention, when the determining module determines the power level of the temperature equalization system based on the ambient temperature value, the bus current value within the set time period, and the current remaining capacity value, it includes:

[0057] Calculate the root mean square value of the bus current within the set time period;

[0058] Calculate the ratio between the root mean square value and the current remaining capacity value;

[0059] The power rating of the temperature equalization system is determined based on the ambient temperature value and the ratio.

[0060] According to one embodiment of the present invention, the type of temperature equalization requirement is cooling temperature equalization requirement, and determining the power level of the temperature equalization system based on the ambient temperature value and the ratio includes:

[0061] In response to the ambient temperature value being less than or equal to a third set temperature value, if 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 a first power level;

[0062] In response to the ambient temperature value being less than or equal to the third set temperature value, if the set ratio value is greater than the first set value, the rotational speed value of the compressor in the power battery temperature equalization system is obtained, and the power level of the temperature equalization system is determined based on the rotational speed value of the compressor.

[0063] In response to the ambient temperature value being less than or equal to the fourth set temperature and greater than the third set temperature value, if the ratio is greater than the second set value, the compressor speed value is obtained, and the power level of the temperature equalization system is determined based on the compressor speed value.

[0064] In response to the ambient temperature value being greater than the fourth set temperature, the power level of the temperature equalization system is determined to be the second power level;

[0065] Wherein, the power corresponding to the first power level is less than the power corresponding to the second power level.

[0066] According to one embodiment of the present invention, when the determining module determines the power level of the temperature equalization system based on the compressor speed value, it includes:

[0067] If the compressor speed is greater than the first set speed, then the power level of the temperature equalization system is determined to be the third power level.

[0068] If the compressor speed is less than or equal to the first set speed, then the power level of the temperature equalization system is determined to be the first power level.

[0069] If the compressor speed is greater than the second set speed, then the power level of the temperature equalization system is determined to be the second power level.

[0070] If the compressor's rotational speed is less than or equal to the second set rotational speed, then the power level of the temperature equalization system is determined to be the third power level.

[0071] Wherein, the power corresponding to the first power level is less than the power corresponding to the third power level, and the power corresponding to the third power level is less than the power corresponding to the second power level.

[0072] According to an embodiment of the present invention, where the type of temperature equalization requirement is heating temperature equalization requirement, the determining module, when determining the power level of the temperature equalization system based on the ambient temperature value and the ratio, includes:

[0073] In response to the ambient temperature value being greater than or equal to a fifth set temperature value, if the ratio is less than or equal to a third set value, then the power level of the temperature equalization system is determined to be a fourth power level.

[0074] In response to the ambient temperature value being greater than or equal to the fifth set temperature value, if the ratio is greater than the third set value, the speed value of the compressor in the power battery equalization system and the setting of the heating film in the equalization component are obtained, and the power level of the equalization system is determined based on the speed value of the compressor and the setting of the heating film.

[0075] In response to the ambient temperature value being greater than or equal to the sixth set temperature and less than the fifth set temperature value, if the ratio is greater than the fourth set value, the compressor speed value and the heating film setting are obtained, and the power level of the temperature equalization system is determined based on the compressor speed value and the heating film setting.

[0076] In response to the ambient temperature value being less than the sixth set temperature T1, the power level of the temperature equalization system is determined to be the fifth power level;

[0077] The power corresponding to the fourth power level is less than the power corresponding to the fifth power level.

[0078] According to one embodiment of the present invention, when the determining module determines the power level of the temperature equalization system based on the compressor speed and the setting of the heating film, it includes:

[0079] If the compressor speed is greater than the first set speed or the heating film is at the first set setting, then the power level of the temperature equalization system is determined to be the fourth power level.

[0080] If the compressor speed is less than or equal to the first set speed and the heating film is not at the first set setting, then the power level of the temperature equalization system is determined to be the sixth power level.

[0081] If the compressor speed is greater than the second set speed or the heating film is at the second set setting, then the power level of the temperature equalization system is determined to be the fifth power level.

[0082] If the compressor speed is less than or equal to the second set speed and the heating film is not in the second set setting, then the power level of the temperature equalization system is determined to be the sixth power level.

[0083] The power corresponding to the fourth power level is less than the power corresponding to the sixth power level, and the power corresponding to the sixth power level is less than the power corresponding to the fifth power level.

[0084] To achieve the above objectives, a third aspect of the present invention also provides an electronic device, comprising:

[0085] At least one processor; and,

[0086] A memory communicatively connected to the at least one processor; wherein,

[0087] 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.

[0088] The electronic device of this invention executes the control method of the power battery temperature equalization system described above. By comprehensively considering multiple factors such as ambient temperature value, bus current value within a set time period and current remaining capacity value of the battery pack, the power level of the temperature equalization system is determined, and the temperature equalization component is controlled according to the determined power level to achieve precise regulation of battery pack temperature.

[0089] 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.

[0090] The control method of the power battery temperature equalization system in this embodiment of the invention, by executing the above-described control method of the power battery temperature equalization system, determines the power level of the temperature equalization system by comprehensively considering multiple factors such as ambient temperature value, bus current value within a set time period and current remaining capacity value of battery pack, and controls the temperature equalization component according to the determined power level, so as to achieve precise regulation of battery pack temperature.

[0091] 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.

[0092] The computer program product of this invention executes the control method of the power battery equalization system described above. By comprehensively considering multiple factors such as ambient temperature, bus current within a set time period, and the current remaining capacity of the battery pack, the power level of the equalization system is determined, and the equalization components are controlled according to the determined power level to achieve precise regulation of the battery pack temperature.

[0093] 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

[0094] 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:

[0095] Figure 1 This is a perspective view of a power battery temperature equalization component according to the present invention;

[0096] Figure 2 This is an exploded view of a power battery temperature equalization component according to the present invention;

[0097] Figure 3 This is a cross-sectional view of the heat spreader of the present invention;

[0098] Figure 4This is a schematic diagram of the heating film of the present invention;

[0099] Figure 5 This is a perspective view of another power battery temperature equalization component of the present invention;

[0100] Figure 6 This is an exploded view of another power battery temperature equalization component of the present invention;

[0101] Figure 7 This is a schematic diagram of the battery module structure of the present invention;

[0102] Figure 8 This is an exploded view of the cell and power battery temperature equalization assembly of the present invention;

[0103] Figure 9 This is a schematic diagram of the battery module (without the battery cells) of the present invention;

[0104] Figure 10 This is a schematic diagram of the battery pack structure of the present invention;

[0105] Figure 11 This is an exploded view of the battery pack of the present invention;

[0106] Figure 12 This is a schematic diagram of the battery box structure of the present invention;

[0107] 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;

[0108] 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;

[0109] Figure 15 This is a schematic diagram of the power battery temperature equalization system of the present invention;

[0110] Figure 16 This is a low-voltage connection block diagram of the power battery temperature equalization system of the present invention;

[0111] Figure 17 This is a high-voltage connection block diagram of the power battery temperature equalization system of the present invention;

[0112] Figure 18 This is a block diagram of the water / coolant pipeline connection of the power battery equalization system of the present invention;

[0113] Figure 19 This is a flowchart of the control method for the power battery temperature equalization system of the present invention;

[0114] Figure 20 This is a flowchart of the present invention for determining whether a battery requires temperature equalization;

[0115] Figure 21This is a flowchart of the cooling temperature uniformity requirement determination method of the present invention;

[0116] Figure 22 This is a flowchart of the heating uniformity requirement determination method of the present invention;

[0117] Figure 23 This is a block diagram of the control device for the power battery temperature equalization system of the present invention.

[0118] Explanation of reference numerals in the attached diagram: 1-heat spreader, 2-heating film, 3-insulating sheet;

[0119] 100-Power battery temperature equalization assembly, 200-End plate, 300-Battery cell, 400-Cable tie, 500-Battery box;

[0120] 11-Medium flow channel, 111-Sealed cavity, 112-Spacer bar, 113-First gap, 114-Second gap, 12-First side, 13-Second side;

[0121] 21-Heating body, 22-Wire harness, 23-Connector;

[0122] 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

[0123] 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.

[0124] 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.

[0125] 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.

[0126] 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:

[0127] 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.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] 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.

[0132] 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.

[0133] In some embodiments, such as Figure 5 and Figure 6As 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.

[0134] In other embodiments, such as Figure 1 and Figure 2 As 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.

[0135] 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.

[0136] 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.

[0137] Based on the same concept, a second aspect of the present invention proposes a battery module, combined with... Figure 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.

[0138] 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.

[0139] Based on the same concept, a third aspect of the present invention proposes a battery pack, combined with Figure 10-14 As shown, it includes a battery box 500 and battery cells 300, as well as 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.

[0140] 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.

[0141] 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.

[0142] 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.

[0143] 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.

[0144] 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.

[0145] The following is combined Figures 15-18 The present invention introduces a power battery temperature equalization system.

[0146] 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.

[0147] 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).

[0148] 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.

[0149] 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.

[0150] Figure 18 This 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.

[0151] 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.

[0152] 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:

[0153] S1, in response to the requirement of temperature equalization in the battery pack of the power battery, acquires the ambient temperature value, the bus current value within a set time period, and the current remaining capacity value of the battery pack; wherein, 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.

[0154] Before performing step S1, it is first determined whether the battery pack in the power battery has a temperature equalization requirement. The process of determining whether the battery pack in the power battery has a temperature equalization requirement may include: obtaining the temperature values ​​of multiple cells in the battery pack; determining the temperature peak (highest temperature of the cell) and temperature valley (lowest temperature of the cell) from the temperature values ​​of multiple cells; and determining whether the battery pack has a temperature equalization requirement based on the temperature peak and temperature valley.

[0155] Among them, such as Figure 20 As shown, when the temperature valley value exceeds the first set temperature value t1, such as 45℃, it is determined that the battery pack has a temperature equalization requirement, and the type of temperature equalization requirement is a cooling temperature equalization requirement. It should be noted that the cooling temperature equalization requirement determination process is as follows: Figure 21 As shown;

[0156] If the peak temperature is less than the second set temperature value t2 (e.g., 0℃), it is determined that the battery pack has a temperature equalization requirement, and the type of temperature equalization requirement is heating temperature equalization requirement. It should be noted that the process for determining the heating temperature equalization requirement is as follows: Figure 22 As shown;

[0157] If the temperature trough is less than or equal to the first set temperature t1 and the temperature peak is greater than or equal to the second set temperature t2, it is determined that the battery pack has no temperature uniformity requirement.

[0158] S2 determines the power level of the temperature equalization system based on the ambient temperature value, the bus current value within the set time period, and the current remaining capacity value.

[0159] The process of step S2 is as follows: calculate the root mean square value (RMS) of the bus current within a set time period, such as 1 minute, and calculate the ratio between the RMS value and the current remaining capacity value C. Then, based on the ambient temperature value T and the ratio RMS / C, determine the power level of the temperature equalization system.

[0160] Example 1: The type of temperature equalization requirement is cooling temperature equalization requirement. The process for determining cooling temperature equalization requirement is as follows: Figure 21 As shown.

[0161] Based on the ambient temperature value T and the ratio RMS / C, determine the power rating of the temperature equalization system, including:

[0162] 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.

[0163] 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.

[0164] 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.

[0165] 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.

[0166] The power corresponding to the first power level is less than the power corresponding to the second power level.

[0167] Based on the compressor's rotational speed R, determine the power rating of the temperature equalization system, including:

[0168] 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.

[0169] 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.

[0170] 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.

[0171] 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.

[0172] 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.

[0173] Example 2: The type of temperature equalization requirement is heating temperature equalization requirement. The process for determining heating temperature equalization requirement is as follows: Figure 22 As shown.

[0174] Based on the ambient temperature value T and the ratio RMS / C, determine the power rating of the temperature equalization system, including:

[0175] 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 fourth power level, i.e., low-demand heating equalization condition.

[0176] 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.

[0177] 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.

[0178] When the ambient temperature T is less than the sixth set temperature T1, the power level of the uniform temperature system is determined to be the fifth power level, that is, the high demand heating uniform temperature condition.

[0179] The power corresponding to the fourth power level is less than the power corresponding to the fifth power level.

[0180] Based on the compressor's rotational speed R and the heating film's setting, determine the power rating of the temperature equalization system, including:

[0181] 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 fourth power level, i.e., low demand heating equalization condition.

[0182] 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 sixth power level, i.e., the medium demand heating equalization condition.

[0183] 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 fifth power level, i.e., high demand heating equalization condition.

[0184] 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 position, then the power level of the equalization system is determined to be the sixth power level, that is, the medium demand heating equalization condition.

[0185] Among them, the power corresponding to the fourth power level is less than the power corresponding to the sixth power level, and the power corresponding to the sixth power level is less than the power corresponding to the fifth power level.

[0186] S3 controls the temperature equalization component according to the determined power level to regulate the temperature of the battery pack.

[0187] For example, in a power battery temperature equalization system, when the power level is determined to be a high-demand cooling and temperature equalization condition, it means that a large amount of heat is generated inside the battery pack. This heat needs to be transferred and dissipated quickly and effectively to prevent the battery from overheating and to ensure the battery's safety and performance. At this time, for the temperature equalization component of the liquid cooling system used in this invention, the heating film can be turned off, the flow rate of the coolant can be increased, and the heat exchange efficiency can be improved to remove the heat inside the battery pack more quickly.

[0188] In a power battery temperature equalization system, when the power level is determined to be a high-demand heating and temperature equalization condition, it means that the internal temperature of the battery pack is too low or the temperature distribution is uneven. It is necessary to rapidly and effectively raise the temperature of the battery pack and ensure uniform temperature distribution to prevent battery performance degradation or damage. In this case, for the temperature equalization component of the temperature equalization system used in this invention, the operating mode of the coolant can be adjusted to achieve the functions of heating and temperature equalization. For example, intermittent operation can be used to avoid localized overheating of the battery pack; or variable frequency speed control can be used to adjust the heating power of the heating film according to the real-time temperature of the battery pack, achieving more precise temperature control.

[0189] In other embodiments of the present invention, step S3 may also be based on a determined power level and combined with the working mode of the battery management system (BMS) to execute a corresponding temperature equalization process in order to regulate the temperature of the battery pack.

[0190] The BMS operating mode generally has four states, which reflect the current operating status of the battery pack, as follows.

[0191] Discharge mode: The battery pack discharges current to the outside world.

[0192] Charging mode: The battery pack is charged by external power sources.

[0193] Heating only: When the ambient temperature is very low, the battery pack cannot be charged. In this case, the external power source (usually a charging station) provides power to the thermal management system to heat the battery pack first. Once the temperature rises, it is then charged. Therefore, the prerequisite for heating only is that it is in charging mode, but there is no charging current at this time.

[0194] Cooling only: When the ambient temperature is particularly high, the battery pack cannot be charged. In this case, the external power source (usually a charging station) provides power to the thermal management system to cool the battery pack first. After the temperature drops, it is charged. Therefore, the prerequisite for heating only is that it is in charging mode, but there is no charging current at this time.

[0195] There are generally three states in the thermal management system, which reflect the current working status of the thermal management system, as follows.

[0196] Heating mode: Absorbs heat from the outside environment and then transfers the heat to the battery.

[0197] Cooling mode: Absorbs heat from the battery pack and then carries the heat away.

[0198] Off: Thermal management is not working.

[0199] It should be noted that the working modes can be subdivided into many types. This invention does not subdivide too many modes. Even if the number of modes is increased, the overall temperature equalization approach remains the same.

[0200] It should be noted that t1, t2, C1, C2, C3, C4, T1, T2, T3, and T4 used in this invention are derived from battery simulation, testing, performance, and other comprehensive data. R1 and R2 are derived from battery thermal management simulation or test data, matched with the corresponding compressor power characteristics.

[0201] The general order of magnitude is: 60℃>t1>t2>-30℃, C4>C3>C2>C1, T4>T3>T2>T1, R2>R1.

[0202] For example: t1 = 45℃, t2 = 0℃; C4 = 1.6, C3 = 1.2, C2 = 1, C1 = 0.8; T4 = 40℃, T3 = 35℃, T2 = 0℃, T1 = -10℃; R2 = 5000r / min, R1 = 3000r / min.

[0203] In summary, the power battery temperature equalization system according to an embodiment of the present invention includes multiple temperature equalization components. These components are placed between two cells along the cell height direction. When the battery pack in the power battery requires temperature equalization, the system acquires the ambient temperature value, the bus current value within a set time period, and the current remaining capacity of the battery pack. The bus current value characterizes the current flowing through the bus connecting the battery pack to an external load or charging device. Based on the ambient temperature value, the bus current value within the set time period, and the current remaining capacity, the power level of the temperature equalization system is determined. Then, based on the determined power level, the temperature equalization components are controlled to regulate the battery pack temperature. Therefore, this method determines the power level of the temperature equalization system by comprehensively considering multiple factors such as the ambient temperature value, the bus current value within a set time period, and the current remaining capacity of the battery pack, and controls the temperature equalization components according to the determined power level to achieve precise regulation of the battery pack temperature.

[0204] Figure 23 This is a block diagram of the control device for the power battery temperature equalization system of the present invention.

[0205] like Figure 23 As shown, the control device 1000 of the power battery temperature equalization system of the present invention includes:

[0206] The acquisition module 1100 is used to acquire the ambient temperature value, the bus current value within a set time period, and the current remaining capacity value of the battery pack in response to the temperature equalization requirement of the battery pack in 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.

[0207] The determination module 1200 is used to determine the power level of the temperature equalization system based on the ambient temperature value, the bus current value within a set time period, and the current remaining capacity value.

[0208] The control module 1300 is used to control the temperature equalization component according to the determined power level, so as to regulate the temperature of the battery pack.

[0209] According to one embodiment of the present invention, the above-described apparatus further includes:

[0210] The judgment module is used to obtain the temperature values ​​of multiple cells in the battery pack, and determine the temperature peak and temperature valley values ​​from the temperature values ​​of multiple cells. Based on the temperature peak and temperature valley values, it is determined whether the battery pack has a temperature equalization requirement.

[0211] Among them, in response to the temperature valley value being greater than the first set temperature value, it is determined that the battery pack has a temperature equalization requirement, and the type of temperature equalization requirement is a cooling temperature equalization requirement.

[0212] In response to the temperature peak being less than the second set temperature value, it is determined that the battery pack has a temperature equalization requirement, and the type of temperature equalization requirement is a heating temperature equalization requirement.

[0213] In response to the temperature valley value being less than or equal to the first set temperature value and the temperature peak value being greater than or equal to the second set temperature value, it is determined that the battery pack has no temperature equalization requirement;

[0214] The first set temperature value is greater than the second set temperature value.

[0215] According to an embodiment of the present invention, when the determining module 1200 determines the power level of the temperature equalization system based on the ambient temperature value, the bus current value within a set time period, and the current remaining capacity value, it includes:

[0216] Calculate the root mean square value of the bus current within a set time period;

[0217] Calculate the ratio of the root mean square value to the current remaining capacity value;

[0218] The power rating of the temperature equalization system is determined based on the ambient temperature value and ratio.

[0219] According to one embodiment of the present invention, the type of temperature equalization requirement is cooling temperature equalization requirement, and the power level of the temperature equalization system is determined based on the ambient temperature value and ratio, including:

[0220] In response to an ambient temperature value being less than or equal to a third set temperature value, if the ratio is less than or equal to a first set value, the power level of the temperature equalization system is determined to be the first power level.

[0221] In response to an ambient temperature value being less than or equal to a third set temperature value, if the set ratio is greater than a first set value, the compressor speed value 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 value.

[0222] In response to an ambient temperature value that is less than or equal to the fourth set temperature and greater than the third set temperature value, if the ratio is greater than the second set value, the compressor speed value is obtained, and the power level of the temperature equalization system is determined based on the compressor speed value.

[0223] In response to the ambient temperature being greater than the fourth set temperature, the power level of the temperature equalization system is determined to be the second power level.

[0224] The power corresponding to the first power level is less than the power corresponding to the second power level.

[0225] According to one embodiment of the present invention, when the determining module 1200 determines the power level of the temperature equalization system based on the compressor speed value, it includes:

[0226] If the compressor speed is greater than the first set speed, the power level of the temperature equalization system is determined to be the third power level.

[0227] If the compressor speed is less than or equal to the first set speed, then the power level of the temperature equalization system is determined to be the first power level.

[0228] If the compressor speed is greater than the second set speed, then the power level of the temperature equalization system is determined to be the second power level.

[0229] If the compressor speed is less than or equal to the second set speed, the power level of the temperature equalization system is determined to be the third power level.

[0230] 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.

[0231] According to one embodiment of the present invention, where the type of temperature equalization requirement is heating temperature equalization requirement, the determining module 1200, when determining the power level of the temperature equalization system based on the ambient temperature value and ratio, includes:

[0232] If the ambient temperature value is greater than or equal to the fifth set temperature value, and the ratio is less than or equal to the third set value, then the power level of the temperature equalization system is determined to be the fourth power level.

[0233] In response to an ambient temperature value greater than or equal to the fifth set temperature value, if the ratio is greater than the third set value, the compressor speed value and the heating film level in the power battery equalization system are obtained, and the power level of the equalization system is determined based on the compressor speed value and the heating film level.

[0234] In response to an ambient temperature value greater than or equal to the sixth set temperature and less than the fifth set temperature value, if the ratio is greater than the fourth set value, the compressor speed value and the heating film setting are obtained, and the power level of the temperature equalization system is determined based on the compressor speed value and the heating film setting.

[0235] In response to the ambient temperature being lower than the sixth set temperature T1, the power level of the temperature equalization system is determined to be the fifth power level.

[0236] The power corresponding to the fourth power level is less than the power corresponding to the fifth power level.

[0237] According to one embodiment of the present invention, when the determining module 1200 determines the power level of the temperature equalization system based on the compressor speed and the heating film setting, it includes:

[0238] If the compressor speed is greater than the first set speed or the heating film is at the first set setting, then the power level of the temperature equalization system is determined to be the fourth power level.

[0239] If the compressor speed is less than or equal to the first set speed and the heating film is not in the first set setting, then the power level of the equalization system is determined to be the sixth power level.

[0240] If the compressor speed is greater than the second set speed or the heating film is at the second set setting, then the power level of the equalization system is determined to be the fifth power level.

[0241] If the compressor speed is less than or equal to the second set speed and the heating film is not in the second set position, then the power level of the equalization system is determined to be the sixth power level.

[0242] Among them, the power corresponding to the fourth power level is less than the power corresponding to the sixth power level, and the power corresponding to the sixth power level is less than the power corresponding to the fifth power level.

[0243] 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.

[0244] According to an embodiment of the present invention, the control device for a power battery temperature equalization system acquires, via an acquisition module, ambient temperature, bus current within a set time period, and the current remaining capacity of the battery pack when temperature equalization is required in the power battery pack. The bus current represents the current flowing through the bus connecting the battery pack to an external load or charging device. A determination module determines the power level of the temperature equalization system based on the ambient temperature, bus current within the set time period, and the current remaining capacity. A control module controls the temperature equalization components according to the determined power level to regulate the battery pack temperature. Thus, this device determines the power level of the temperature equalization system by comprehensively considering multiple factors such as ambient temperature, bus current within a set time period, and the current remaining capacity of the battery pack, and controls the temperature equalization components according to the determined power level to achieve precise temperature control of the battery pack.

[0245] Based on the above embodiments, the present invention also proposes an electronic device.

[0246] The electronic device of this invention includes:

[0247] At least one processor; and,

[0248] A memory communicatively connected to the at least one processor; wherein,

[0249] 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.

[0250] The electronic device of this invention executes the control method of the power battery temperature equalization system described above. By comprehensively considering multiple factors such as ambient temperature value, bus current value within a set time period and current remaining capacity value of the battery pack, the power level of the temperature equalization system is determined, and the temperature equalization component is controlled according to the determined power level to achieve precise regulation of battery pack temperature.

[0251] Based on the above embodiments, the present invention also proposes a computer-readable storage medium.

[0252] 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.

[0253] The control method of the power battery temperature equalization system in this embodiment of the invention, by executing the above-described control method of the power battery temperature equalization system, determines the power level of the temperature equalization system by comprehensively considering multiple factors such as ambient temperature value, bus current value within a set time period and current remaining capacity value of battery pack, and controls the temperature equalization component according to the determined power level, so as to achieve precise regulation of battery pack temperature.

[0254] Based on the above embodiments, the present invention also proposes a computer program product.

[0255] 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.

[0256] The computer program product of this invention executes the control method of the power battery equalization system described above. By comprehensively considering multiple factors such as ambient temperature, bus current within a set time period, and the current remaining capacity of the battery pack, the power level of the equalization system is determined, and the equalization components are controlled according to the determined power level to achieve precise regulation of the battery pack temperature.

[0257] 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.

[0258] 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.

[0259] 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.

[0260] 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.

[0261] 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.

[0262] 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.

[0263] 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.

[0264] 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, The power battery temperature equalization system includes multiple temperature equalization components, which are placed between two cells along the height direction of the cells. The method includes: In response to the requirement for temperature equalization in the battery pack of the power battery, the ambient temperature value, the bus current value within a set time period, and the current remaining capacity value of the battery pack are obtained; wherein, the bus current value is used to characterize the current value flowing through the bus connecting the battery pack to the external load or charging equipment; The power level of the temperature equalization system is determined based on the ambient temperature value, the bus current value within the set time period, and the current remaining capacity value. Specifically, this includes: calculating the root mean square value of the bus current value within the set time period; calculating the ratio between the root mean square value and the current remaining capacity value; and determining the power level of the temperature equalization system based on the ambient temperature value and the ratio. Where the type of temperature equalization requirement is cooling temperature equalization requirement, determining the power level of the temperature equalization system based on the ambient temperature value and the ratio includes: In response to the ambient temperature value being less than or equal to a third set temperature value, if 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 a first power level; In response to the ambient temperature value being less than or equal to the third set temperature value, if the ratio is greater than the first set value, the rotational speed of the compressor in the power battery temperature equalization system is obtained, and the power level of the temperature equalization system is determined based on the rotational speed of the compressor. In response to the ambient temperature value being less than or equal to the fourth set temperature and greater than the third set temperature value, if the ratio is greater than the second set value, the compressor speed value is obtained, and the power level of the temperature equalization system is determined based on the compressor speed value. In response to the ambient temperature value being greater than the fourth set temperature, 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, determining the power level of the temperature equalization system based on the ambient temperature value and the ratio includes: In response to the ambient temperature value being greater than or equal to a fifth set temperature value, if the ratio is less than or equal to a third set value, then the power level of the temperature equalization system is determined to be a fourth power level. In response to the ambient temperature value being greater than or equal to the fifth set temperature value, if the ratio is greater than the third set value, the speed value of the compressor in the power battery equalization system and the setting of the heating film in the equalization component are obtained, and the power level of the equalization system is determined based on the speed value of the compressor and the setting of the heating film. In response to the ambient temperature value being greater than or equal to the sixth set temperature and less than the fifth set temperature value, if the ratio is greater than the fourth set value, the compressor speed value and the heating film setting are obtained, and the power level of the temperature equalization system is determined based on the compressor speed value and the heating film setting. In response to the ambient temperature value being less than the sixth set temperature, the power level of the temperature equalization system is determined to be the fifth power level; The power corresponding to the fourth power level is less than the power corresponding to the fifth power level; The method further includes: The temperature equalization component is controlled according to the determined power level to regulate the temperature of the battery pack.

2. The method according to claim 1, characterized in that, The method further includes: Obtain the temperature values ​​of multiple cells in the battery pack; From the temperature values ​​of the multiple battery cells, determine the temperature peak and temperature valley values; Based on the temperature peak and temperature trough values, determine whether the battery pack requires temperature equalization. Wherein, in response to the temperature valley value being greater than the first set temperature value, it is determined that the battery pack has a temperature equalization requirement, and the type of temperature equalization requirement is a cooling temperature equalization requirement. In response to the peak temperature being less than the second set temperature value, it is determined that the battery pack has a temperature equalization requirement, and the type of temperature equalization requirement is a heating temperature equalization requirement. In response to the temperature valley value being less than or equal to the first set temperature value and the temperature peak value being greater than or equal to the second set temperature value, it is determined that the battery pack has no temperature equalization requirement; Wherein, the first set temperature value is greater than the second set temperature value.

3. The method according to claim 1, characterized in that, Determining the power level of the temperature equalization system based on the compressor's rotational speed includes: If the compressor speed is greater than the first set speed, then the power level of the temperature equalization system is determined to be the third power level. If the compressor speed is less than or equal to the first set speed, then the power level of the temperature equalization system is determined to be the first power level. If the compressor speed is greater than the second set speed, then the power level of the temperature equalization system is determined to be the second power level. If the compressor's rotational speed is less than or equal to the second set rotational speed, then the power level of the temperature equalization system is determined to be the third power level. Wherein, the power corresponding to the first power level is less than the power corresponding to the third power level, and the power corresponding to the third power level is less than the power corresponding to the second power level.

4. The method according to claim 1, characterized in that, Determining the power level of the temperature equalization system based on the compressor's rotational speed and the heating film's setting includes: If the compressor speed is greater than the first set speed or the heating film is at the first set setting, then the power level of the temperature equalization system is determined to be the fourth power level. If the compressor speed is less than or equal to the first set speed and the heating film is not at the first set setting, then the power level of the temperature equalization system is determined to be the sixth power level. If the compressor speed is greater than the second set speed or the heating film is at the second set setting, then the power level of the temperature equalization system is determined to be the fifth power level. If the compressor speed is less than or equal to the second set speed and the heating film is not in the second set setting, then the power level of the temperature equalization system is determined to be the sixth power level. The power corresponding to the fourth power level is less than the power corresponding to the sixth power level, and the power corresponding to the sixth power level is less than the power corresponding to the fifth power level.

5. A control device for a power battery temperature equalization system, characterized in that, The power battery temperature equalization system includes multiple temperature equalization components, which are placed between two cells along the height direction of the cells. The device is used to implement the control method of the power battery temperature equalization system as described in claim 1, and the device includes: The acquisition module is used to acquire the ambient temperature value, the bus current value within a set time period, and the current remaining capacity value of the battery pack in response to the temperature equalization requirement of the battery pack in the power battery; wherein, the bus current value is used to characterize the current value flowing through the bus connecting the battery pack to the external load or charging equipment; The determination module is used to determine the power level of the temperature equalization system based on the ambient temperature value, the bus current value within the set time period, and the current remaining capacity value. The control module is used to control the temperature equalization component according to a determined power level, so as to regulate the temperature of the battery pack.

6. An electronic device, characterized in that, include: At least one processor; as well as, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, 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 according to any one of claims 1-4.

7. 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 1-4.

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