Power battery temperature equalizing assembly, battery module and battery pack

Abstract

The utility model provides a power battery temperature equalizing assembly, a battery module and a battery pack, the power battery temperature equalizing assembly is placed between two battery cells along the height direction of the battery cells, and comprises a temperature equalizing plate, a heating film and an insulating sheet; a medium flow channel is arranged in the temperature-uniforming plate in a winding mode in the length direction and the height direction, and heating films are connected to the first side face and the second side face of the temperature-uniforming plate in an attached mode respectively. And the insulating sheet is connected to the first side surface and the second side surface in a covering manner and is positioned between the uniform temperature plate and the battery cell. Medium flow channels are arranged in the temperature equalizing plate in the length direction and the height direction in a winding mode, heating films are connected to the first side face and the second side face of the temperature equalizing plate in an attached mode respectively, battery cells attached to the two sides of the power battery temperature equalizing assembly can be cooled and heated, and temperature equalizing of the battery cells in the vertical direction is achieved; the charging and discharging strategy is executed according to the battery cell top temperature, and the performance and service life of the battery cell are not damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of battery temperature equalization, and in particular to a power battery temperature equalization component, a battery module and a battery pack. Background Art

[0002] The purpose of power battery temperature control is to maintain it in optimal operating condition. A temperature range of 25°C to 40°C is generally considered favorable for power battery operation. At extreme temperatures, lithium-ion batteries experience capacity fade, power degradation, and self-discharge, demonstrating the significant impact of temperature on power batteries. In the event of thermal runaway, a large number of chain chemical reactions will occur continuously, leading to a short circuit and potentially a fire. Therefore, power battery safety is a major obstacle in electric vehicle development, making thermal management a crucial issue in the development of electric vehicles.

[0003] Currently, bottom-cooling / heating is a common thermal management method for automotive power batteries, with cooling media including ethylene glycol and water (liquid cooling) and refrigerant (direct cooling). During bottom-cooling / heating, a temperature difference occurs in the battery cells along their height. Specifically, during cooling, the temperature gradually increases from the bottom to the top of the cell; during heating, the temperature gradually decreases from the bottom to the top. This problem is particularly prominent in direct cooling solutions, as direct cooling systems cannot provide uniform temperature distribution across the cells. Since only the top cell temperature can be measured, if uniform temperature distribution is not achieved, charging and discharging strategies based on the top cell temperature will be detrimental to the cell's performance and lifespan. Utility Model Content

[0004] In view of this, the present invention proposes a power battery temperature equalizing component, battery module and battery pack to solve the technical problems proposed in the above background technology, such as the temperature difference of the battery cells in the height direction, the low accuracy of the charging and discharging strategy application, and the low performance and life of the battery cells.

[0005] The technical solution of the present utility model is achieved as follows:

[0006] In a first aspect, the present invention provides a power battery temperature equalization assembly, which is placed between two battery cells along the height direction of the battery cells and includes a temperature equalization plate, a heating film, and an insulating sheet, wherein:

[0007] A medium flow channel is arranged in a coiled manner along the length direction and the height direction inside the temperature averaging plate, and a heating film is respectively attached to the first side surface and the second side surface of the temperature averaging plate;

[0008] The insulating sheet is covered and connected to the first side surface and the second side surface, and is located between the temperature dispersion plate and the battery core.

[0009] On the basis of the above technical solution, preferably, a sealed cavity is provided inside the temperature equalizing plate, and a plurality of parallel partitions are provided in the sealed cavity, the partitions extending along the length direction of the temperature equalizing plate, and the plurality of partitions separate the sealed cavity to form the medium flow channel.

[0010] Based on the above technical solution, preferably, two adjacent spacers, one end of which forms a first gap with the side of the sealed cavity, and the other spacer forms a second gap with the side of the sealed cavity at the end away from the first gap, and the cross-section of the medium flow channel is S-shaped.

[0011] Based on the above technical solution, preferably, the heating film is adhered to the top surface, the first side surface and the second side surface of the temperature equalizing plate, the bottom of the heating film is higher than the bottom surface of the temperature equalizing plate, and the insulating sheet is adhered to the outside of the heating film and adhered to the first side surface and the second side surface of the temperature equalizing plate.

[0012] Based on the above technical solution, preferably, two of the heating film and the insulating sheet are provided, one heating film and one insulating sheet are pasted to fill the first side surface, and another heating film and another insulating sheet are pasted to fill the first side surface and the second side surface, and the insulating sheet is located below the heating film.

[0013] On the basis of the above technical solution, preferably, the heating film includes a heating body, two wiring harnesses and two connectors, the two wiring harnesses are respectively connected to the two ends of the heating body in the length direction, and the two ends of the wiring harness are respectively connected to the heating body and the connectors.

[0014] In the second aspect, the present invention also proposes a battery module, comprising an end plate, a battery cell and the power battery temperature equalizing assembly described in the first aspect, wherein at least two rows of battery cells are vertically fixed between two end plates, the power battery temperature equalizing assembly is located between two adjacent rows of battery cells, and the two ends of the temperature equalizing plate are respectively connected to the two end plates.

[0015] In the third aspect, the present invention also proposes a battery pack, comprising a battery box and battery cells, and the power battery temperature equalizing assembly described in the first aspect, at least two rows of battery cells are vertically fixed in the battery box, at least one surface of each row of battery cells is in contact with the power battery temperature equalizing assembly, and both ends of the temperature equalizing plate are respectively connected to the battery box.

[0016] On the basis of the above technical solution, preferably, the battery box includes a box body, a first crossbeam, a second crossbeam and two longitudinal beams, the first crossbeam and the second crossbeam are fixed at intervals at the bottom of the box body, the two ends of the longitudinal beam are respectively vertically connected to the first crossbeam and the second crossbeam to form a square placement area for placing batteries, and the two ends of the temperature equalizing plate are respectively connected to the first crossbeam and the second crossbeam.

[0017] On the basis of the above technical solution, preferably, a first channel connected to the medium flow channel is provided inside the first crossbeam, and a medium inlet and a medium outlet connected to the first channel are provided on the first crossbeam. The battery box also includes a first pipe and a second pipe, the first pipe is connected to the medium inlet and passes through the box body, the second pipe is connected to the medium outlet and passes through the box body, and a second channel connected to the medium flow channel is provided inside the second crossbeam to form a circulating temperature equalizing pipeline.

[0018] The power battery temperature equalization assembly of the present invention has the following beneficial effects compared with the prior art:

[0019] (1) A medium flow channel is arranged along the length and height directions inside the temperature averaging plate, and a heating film is attached to the first side and the second side of the temperature averaging plate respectively, which can cool and heat the battery cells attached to both sides of the power battery temperature averaging assembly, avoid the temperature difference of the battery cells in the vertical direction, achieve temperature uniformity of the battery cells, and execute the charging and discharging strategy according to the top temperature of the battery cells, without damaging the performance and life of the battery cells;

[0020] (2) A sealed cavity is provided inside the temperature equalizing plate, and a plurality of parallel spacers are provided in the sealed cavity. The spacers extend along the length direction of the temperature equalizing plate. The plurality of spacers separate the sealed cavity to form the medium flow channel, so that the medium flow channel is arranged in a winding manner along the length direction and the height direction, so that the medium flows more evenly, thereby improving the temperature equalization effect on the battery cell;

[0021] (3) Through two adjacent spacers, one end of one spacer forms a first gap with the side of the sealed cavity, and the other spacer forms a second gap with the side of the sealed cavity at the end away from the first gap, and the cross-section of the medium flow channel is S-shaped, so that the medium flow channel can form a "greedy snake" shape connected end to end, making the medium flow more uniform and improving the temperature uniformity of the battery cell;

[0022] (4) The heating film is attached to the top surface, the first side surface, and the second side surface of the temperature evaporating plate, the bottom surface of the heating film is higher than the bottom surface of the temperature evaporating plate, and the insulating sheet is attached to the outside of the heating film and attached to the first side surface and the second side surface of the temperature evaporating plate. The area of ​​the temperature evaporating plate not covered by the heating film is covered by the insulating sheet to avoid the risk of short circuit between the battery cell and the temperature evaporating plate, thereby improving the safety and reliability of the device;

[0023] (5) Two heating films and two insulating sheets are provided, one heating film and one insulating sheet are pasted to fill the first side surface, and another heating film and another insulating sheet are pasted to fill the first side surface and the second side surface. The insulating sheet is located below the heating film, and the area of ​​the temperature averaging plate that is not covered by the heating film is covered by the insulating sheet to avoid the risk of short circuit between the battery cell and the temperature averaging plate, thereby improving the safety and reliability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is a three-dimensional diagram of a power battery temperature equalizing assembly of the present utility model;

[0026] Figure 2 This is an exploded view of a power battery temperature equalizing assembly of the present utility model;

[0027] Figure 3 This is a cross-sectional view of the temperature equalizing plate of the present invention;

[0028] Figure 4 This is a schematic structural diagram of the heating film of the present invention;

[0029] Figure 5 This is a three-dimensional diagram of another power battery temperature equalizing assembly of the present invention;

[0030] Figure 6 This is an exploded view of another power battery temperature equalizing assembly of the present invention;

[0031] Figure 7 This is a schematic structural diagram of the battery module of the present invention;

[0032] Figure 8 This is an exploded view of the battery cell and power battery temperature equalizing assembly of the present invention;

[0033] Figure 9 This is a schematic structural diagram of the battery module of the present invention (excluding the battery cells);

[0034] Figure 10 This is a schematic structural diagram of the battery pack of the present utility model;

[0035] Figure 11 This is an exploded view of the battery pack of the present invention;

[0036] Figure 12 This is a schematic structural diagram of the battery box of the present utility model;

[0037] Figure 13 Schematic diagram of the flow of the temperature-equalizing medium from the battery box to the temperature-equalizing plate of the present invention;

[0038] Figure 14 Schematic diagram of the flow of liquid cooling / direct cooling medium at the bottom of the battery box of the present invention.

[0039] Description of reference numerals: 1-temperature averaging plate, 2-heating film, 3-insulating sheet;

[0040] 100-power battery temperature equalizing assembly, 200-end plate, 300-battery cell, 400-cable tie, 500-battery box;

[0041] 11- medium flow channel, 111- sealing cavity, 112- spacer, 113- first gap, 114- second gap, 12- first side surface, 13- second side surface;

[0042] 21-heating body, 22-wiring harness, 23-connector;

[0043] 510 - box body, 520 - first crossbeam, 521 - medium inlet, 522 - medium outlet, 530 - second crossbeam, 540 - longitudinal beam, 550 - first pipe, 560 - second pipe. DETAILED DESCRIPTION

[0044] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0045] Reference Figures 1-6 As shown, the first embodiment of the present invention proposes a power battery temperature equalization assembly, which is placed between two battery cells along the height direction of the battery cells, including a temperature equalization plate 1, a heating film 2 and an insulating sheet 3, wherein:

[0046] A medium flow channel 11 is arranged in a coiled manner along the length direction and the height direction inside the temperature averaging plate 1. The first side surface 12 and the second side surface 13 of the temperature averaging plate 1 are respectively connected with the heating film 2;

[0047] The insulating sheet 3 covers and connects to the first side surface 12 and the second side surface 13 , and is located between the temperature vapor chamber 1 and the battery cell.

[0048] It should be noted that the first side 12 and the second side 13 of the temperature equalizing plate 1 are respectively attached to the heating film 2, and the insulating sheet 3 is covered and connected to the first side 12 and the second side 13. After the assembly of the power battery temperature equalizing assembly is completed, one side of the power battery temperature equalizing assembly is attached to one battery cell, and the other side is attached to another battery cell, thereby achieving temperature uniformity of the battery cells in the height direction, and at the same time can assist in achieving temperature uniformity between different battery cells.

[0049] The power battery temperature equalizing assembly proposed in this embodiment is provided with a medium flow channel 11 coiled along the length and height directions inside the temperature equalizing plate 1, and the first side 12 and the second side 13 of the temperature equalizing plate 1 are respectively bonded with a heating film 2, which can cool and heat the battery cells bonded on both sides of the power battery temperature equalizing assembly, avoid temperature differences in the battery cells in the vertical direction, achieve temperature equalization of the battery cells, and execute charging and discharging strategies according to the temperature at the top of the battery cells, without damaging the performance and life of the battery cells.

[0050] In some embodiments, a sealed cavity 111 is provided within the vapor chamber 1. A plurality of parallel ribs 112 are provided within the sealed cavity 111. The ribs 112 extend along the length of the vapor chamber 1. The ribs 112 divide the sealed cavity 111 into sections to form the medium flow channels 11. The multiple ribs 112 divide the sealed cavity 111 into sections to form the medium flow channels 11, allowing the medium flow channels 11 to be arranged in a coiled arrangement along the length and height directions, resulting in more uniform medium flow and improved temperature balancing for the battery cells.

[0051] In some embodiments, two adjacent spacers 112 form a first gap 113 between one end of one spacer 112 and the side of the sealed cavity 111, and a second gap 114 between the other spacer 112 and the side of the sealed cavity 111 at its end away from the first gap 113. The cross-section of the medium flow channel 11 is S-shaped. This structure allows the medium flow channel 11 to form a "snake" shape with its end connected, resulting in more uniform medium flow and improved temperature distribution within the battery cell.

[0052] In some embodiments, as Figure 5 and Figure 6As shown, the heating film 2 is attached to the top surface, first side surface 12 and second side surface 13 of the temperature evaporating plate 1, the bottom of the heating film 2 is higher than the bottom surface of the temperature evaporating plate 1, and the insulating sheet 3 is attached to the outside of the heating film 2 and attached to the first side surface 12 and second side surface 13 of the temperature evaporating plate 1. The heating film 2 is an integrated U-shaped structure, and the heating film 2 is upside down on the temperature evaporating plate 1 to attach to the top surface, first side surface 12 and second side surface 13 of the temperature evaporating plate 1, the bottom of the heating film 2 is higher than the bottom surface of the temperature evaporating plate 1, and the insulating sheet 3 is attached to the outside of the heating film 2 and attached to the first side surface 12 and second side surface 13 of the temperature evaporating plate 1. The area of ​​the temperature evaporating plate 1 not covered by the heating film 2 is covered by the insulating sheet 3 to avoid the risk of short circuit between the battery cell and the temperature evaporating plate 1, thereby improving the safety and reliability of the device.

[0053] In other embodiments, 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 pasted together to fill the first side surface 12, and another heating film 2 and another insulating sheet 3 are pasted together to fill the first side surface 12 and the second side surface 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 surface 12 and the second side surface 13 are filled. The insulating sheet 3 is located below the heating film 2, and the area of ​​the vapor chamber 1 not covered by the heating film 2 is covered by the insulating sheet 3, avoiding the risk of short circuit between the battery cell and the vapor chamber 1, thereby improving the safety and reliability of the device.

[0054] In some embodiments, the heating film 2 includes a heating body 21, two wiring harnesses 22, and two connectors 23. The two wiring harnesses 22 are respectively connected to the two ends of the heating body 21 in the length direction, and the two ends of the wiring harnesses 22 are respectively connected to the heating body 21 and the connectors 23. By connecting the two wiring harnesses 22 to the two ends of the heating body 21 in the length direction, and the two ends of the wiring harnesses 22 are respectively connected to the heating body 21 and the connectors 23, the two connectors 23 are respectively connected to the positive and negative poles of the power supply, so as to realize the power supply of the heating film 2. The provision of the connectors 23 improves the convenience of connecting the heating film 2 to the power supply, and facilitates assembly and disassembly.

[0055] The working principle of the power battery temperature equalizing assembly is as follows: battery cells are respectively attached to both sides of the power battery temperature equalizing assembly, and a medium flow channel 11 is arranged inside the temperature equalizing plate 1 along the length and height directions. The battery cells are cooled by the medium in the medium flow channel 11. The first side 12 and the second side 13 of the temperature equalizing plate 1 are respectively attached to the heating film 2. The battery cells are heated by the heating film 2, which can avoid temperature differences in the battery cells in the vertical direction, achieve temperature uniformity of the battery cells, and execute charging and discharging strategies according to the top temperature of the battery cells, without damaging the performance and life of the battery cells.

[0056] Based on the same concept, the second embodiment of the present invention proposes a battery module, combined with Figure 7-9 As shown, it includes an end plate 200, a battery cell 300 and the power battery temperature equalizing assembly 100 described in the first aspect, at least two rows of battery cells 300 are vertically fixed between the two end plates 200, and the two ends of the cable tie 400 are respectively connected to the two end plates 200, and the battery cells 300 are fixed by the cable tie 400. The power battery temperature equalizing assembly 100 is located between two adjacent rows of battery cells 300, and the two ends of the temperature equalizing plate 1 are respectively connected to the two end plates 200.

[0057] The battery module proposed in this embodiment can achieve temperature uniformity of the battery cell 300, and execute the charging and discharging strategy according to the top temperature of the battery cell 300, without damaging the performance and life of the battery cell 300; at the same time, the two ends of the temperature uniformity plate 1 are respectively connected to the two end plates 200, which can provide strength support for the battery module and reduce the reinforcement structure outside the module, such as the cable tie 400. The cable tie 400 can be reduced from 2 to 1, and the width / strength of the cable tie 400 can be reduced, which can reduce costs; in addition, the addition of the temperature uniformity component can appropriately reduce the operating power of the liquid cooling / direct cooling system, or shorten the operating time.

[0058] Based on the same concept, the third embodiment of the present invention proposes a battery pack, combined with Figure 10-14 As shown, it includes a battery box 500 and battery cells 300, as well as the power battery temperature equalizing assembly 100 described in the first aspect, at least two rows of battery cells 300 are vertically fixed in the battery box 500, at least one surface of each row of battery cells 300 is in contact with the power battery temperature equalizing assembly 100, and both ends of the temperature equalizing plate 1 are respectively connected to the battery box 500.

[0059] It should be noted that a liquid cooling / direct cooling channel is provided at the bottom of the battery box 500 to perform liquid cooling or direct cooling on the bottom of the battery cell 300.

[0060] The battery pack provided in this embodiment can achieve temperature uniformity of the battery cells 300 and execute charging and discharging strategies according to the top temperature of the battery cells 300, without damaging the performance and life of the battery cells 300; at the same time, the two ends of the temperature uniformity plate 1 are respectively connected to the battery box 500, which can provide strength support for the battery box 500, reduce the reinforcement structure of the battery box 500, and reduce costs; in addition, the addition of the temperature uniformity component can appropriately reduce the operating power of the liquid cooling / direct cooling system, or shorten the operating time.

[0061] In some embodiments, the battery box 500 includes a box body 510, a first crossbeam 520, a second crossbeam 530, and two longitudinal beams 540. The first crossbeam 520 and the second crossbeam 530 are fixed at intervals at the bottom of the box body 510. The ends of the longitudinal beam 540 are respectively connected to the first crossbeam 520 and the second crossbeam 530, forming a square placement area for placing batteries. The ends of the temperature vapor chamber 1 are respectively connected to the first crossbeam 520 and the second crossbeam 530. By connecting the ends of the temperature vapor chamber 1 to the first crossbeam 520 and the second crossbeam 530, the battery box 500 is provided with strength support, which can reduce the reinforcement structure of the battery box 500 and reduce costs.

[0062] In some embodiments, the first crossbeam 520 is internally provided with a first channel connected to the medium flow channel 11. The first crossbeam 520 is provided with a medium inlet 521 and a medium outlet 522 connected to the first channel. The battery case 500 further includes a first pipe 550 and a second pipe 560. The first pipe 550 is connected to the medium inlet 521 and passes through the case, and the second pipe 560 is connected to the medium outlet 522 and passes through the case. The second crossbeam 530 is internally provided with a second channel connected to the medium flow channel 11, thereby forming a circulating temperature-averaging pipeline. The medium enters the medium inlet 521 from the first pipe 550, flows into the medium flow channel 11 from the first channel, circulates back into the first channel, and flows out of the second pipe 560 through the medium outlet 522 before being discharged. The medium can also circulate between the medium flow channels 11 of two adjacent vapor chambers 1 through the second channel, forming a circulating temperature-averaging pipeline. This can achieve uniform temperature distribution across the height of the battery cells 300 and also assist in achieving uniform temperature distribution between different battery cells 300.

[0063] In some embodiments, as Figure 14 As shown, the liquid cooling / direct cooling channel at the bottom of the battery box 500 can also be S-shaped, similar to the medium channel 11, which can improve the uniformity of cooling and improve reliability and stability.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A power battery temperature equalizing component, placed between two battery cells (300) along the height direction of the battery cell (300), characterized in that: It comprises a temperature-averaging plate (1), a heating film (2) and an insulating sheet (3), wherein: A medium flow channel (11) is arranged in a coiled manner along the length direction and the height direction inside the temperature equalizing plate (1), and a heating film (2) is respectively attached to the first side surface (12) and the second side surface (13) of the temperature equalizing plate (1); The insulating sheet (3) is covered and connected to the first side surface (12) and the second side surface (13), and is located between the temperature averaging plate (1) and the battery core (300).

2. The power battery temperature equalizing assembly according to claim 1, characterized in that: A sealed cavity (111) is provided inside the temperature equalizing plate (1), and a plurality of mutually parallel partitions (112) are provided inside the sealed cavity (111). The partitions (112) extend along the length direction of the temperature equalizing plate (1), and the plurality of partitions (112) separate the sealed cavity (111) to form the medium flow channel (11).

3. The power battery temperature equalizing assembly according to claim 2, characterized in that: Two adjacent spacers (112), one end of one spacer (112) and the side surface of the sealed cavity (111) form a first gap (113), and the other spacer (112) forms a second gap (114) at the end away from the first gap (113) and the side surface of the sealed cavity (111), and the cross section of the medium flow channel (11) is S-shaped.

4. The power battery temperature equalizing assembly according to claim 1, wherein: The heating film (2) is adhered to the top surface, the first side surface (12) and the second side surface (13) of the temperature averaging plate (1); the bottom of the heating film (2) is higher than the bottom surface of the temperature averaging plate (1); the insulating sheet (3) is adhered and sleeved outside the heating film (2) and adhered to the first side surface (12) and the second side surface (13) of the temperature averaging plate (1).

5. The power battery temperature equalizing assembly according to claim 1, characterized in that: Two of each of the heating film (2) and the insulating sheet (3) are provided, one of the heating film (2) and the insulating sheet (3) are pasted to fill the first side surface (12), and another of the heating film (2) and the insulating sheet (3) are pasted to fill the first side surface (12) and the second side surface (13), and the insulating sheet (3) is located below the heating film (2).

6. The power battery temperature equalizing assembly according to claim 1, characterized in that: The heating film (2) comprises a heating body (21), two wiring harnesses (22) and two connectors (23), wherein the two wiring harnesses (22) are respectively connected to the two ends of the heating body (21) in the length direction, and the two ends of the wiring harness (22) are respectively connected to the heating body (21) and the connectors (23).

7. A battery module, characterized in that: The invention comprises an end plate (200), a battery cell (300), and a power battery temperature equalizing assembly (100) according to any one of claims 1 to 6, wherein at least two rows of battery cells (300) are vertically fixed between two end plates (200), the power battery temperature equalizing assembly (100) is located between two adjacent rows of battery cells (300), and both ends of the temperature equalizing plate (1) are respectively connected to the two end plates (200).

8. A battery pack, characterized in that: The invention comprises a battery box (500) and battery cells (300), and a power battery temperature equalizing assembly (100) according to any one of claims 1 to 6, wherein at least two rows of battery cells (300) are vertically fixed in the battery box (500), at least one surface of each row of battery cells (300) is in contact with the power battery temperature equalizing assembly (100), and both ends of the temperature equalizing plate (1) are respectively connected to the battery box (500).

9. The battery pack according to claim 8, wherein: The battery box (500) comprises a box body (510), a first crossbeam (520), a second crossbeam (530) and two longitudinal beams (540); the first crossbeam (520) and the second crossbeam (530) are fixed at intervals on the bottom of the box body (510); the two ends of the longitudinal beam (540) are respectively vertically connected to the first crossbeam (520) and the second crossbeam (530) to form a square placement area for placing batteries; the two ends of the temperature equalizing plate (1) are respectively connected to the first crossbeam (520) and the second crossbeam (530).

10. The battery pack according to claim 9, wherein: A first channel connected to the medium flow channel (11) is provided inside the first crossbeam (520), and a medium inlet (521) and a medium outlet (522) connected to the first channel are provided on the first crossbeam (520). The battery box (500) further comprises a first pipe (550) and a second pipe (560), wherein the first pipe (550) is connected to the medium inlet (521) and passes through the box body, and the second pipe (560) is connected to the medium outlet (522) and passes through the box body. A second channel connected to the medium flow channel (11) is provided inside the second crossbeam (530), so as to form a circulating temperature-averaging pipeline.

Images