Battery pack and electric equipment

Abstract

The utility model relates to the technical field of battery protection, in particular to a battery pack and electric equipment. The battery pack comprises a battery box and a plurality of battery cells, wherein all the battery cells are horizontally mounted in the battery box; expansion flame-retardant glue is filled between at least one part of adjacent battery cells; and the expansion flame-retardant adhesive can expand after being heated to push away the surrounding battery cells, so that the horizontal distance between the battery cell with thermal runaway and other surrounding battery cells is increased. Wherein when thermal runaway occurs in a certain battery cell filled with the expanded flame-retardant adhesive at the periphery, the generated heat enables the expanded flame-retardant adhesive to be heated and expanded, and the expanded flame-retardant adhesive which is heated and expanded pushes away the surrounding battery cells, so that the horizontal distance between the thermal runaway battery cell and other surrounding battery cells is increased, and the heat transfer resistance is increased. Meanwhile, the expanded flame-retardant adhesive which expands when heated is blocked between the thermal runaway battery cell and other surrounding battery cells, so that the heat transfer resistance is further increased, and the other surrounding battery cells are prevented from being damaged by heating.

Description

Technical Field

[0001] The utility model relates to the technical field of battery protection, in particular to a battery pack and an electrical device. Background Art

[0002] There are multiple cells inside the battery pack, and the horizontal spacing between adjacent cells is small. When a cell experiences thermal runaway, the heat of the cell will be transferred to other surrounding cells, causing the surrounding cells to be damaged by heat. Utility Model Content

[0003] The utility model aims to overcome the problem in the prior art that after a battery cell runs away from heat, it conducts heat to the surroundings, which may cause heat damage to other surrounding battery cells.

[0004] In order to solve or at least partially solve the above-mentioned technical problems, the utility model provides a battery pack, which includes a battery box and a plurality of battery cells, all of which are horizontally installed in the battery box; at least a portion of the battery cells adjacent to each other are filled with expandable flame-retardant adhesive; the expandable flame-retardant adhesive can expand after being heated and push the surrounding battery cells away, so as to increase the horizontal distance between the battery cell experiencing thermal runaway and other surrounding battery cells.

[0005] In some embodiments, all battery cells are filled with expandable flame retardant glue.

[0006] In some embodiments, the vertical height of the expandable flame retardant adhesive after thermal expansion is less than or equal to the vertical height of the battery cell.

[0007] In some embodiments, the vertical height of the expandable flame retardant adhesive before thermal expansion is less than or equal to half of the vertical height of the battery cell.

[0008] In some embodiments, the expandable flame retardant adhesive is arranged so that the horizontal spacing between the opposite side walls of two adjacent battery cells after the expandable flame retardant adhesive is thermally expanded is 1.2-1.5 times the horizontal spacing before the expandable flame retardant adhesive is thermally expanded.

[0009] In some embodiments, the interior of the battery box has a accommodating cavity, in which a first partition plate extending along the width direction of the battery box and a second partition plate extending along the length direction of the battery box are provided. The first partition plate and the second partition plate divide the accommodating cavity into four accommodating areas, each of which is equipped with a portion of the battery cells.

[0010] In some embodiments, in each accommodating area, all battery cells are distributed in multiple rows along the width direction of the battery box, each row of battery cells is a battery cell group, and the pressure relief valve of the battery cell group faces the bottom wall of the battery box; the gap between two adjacent battery cell groups is the battery cell group gap, and a first protective rubber strip made of expandable flame retardant material and extending along the battery cell group gap is arranged under each battery cell group gap, and the pressure relief valves of two adjacent battery cell groups are separated by the corresponding first protective rubber strip; a plurality of explosion-proof valves are provided on the side wall of the battery box, and the pressure relief valve of each battery cell group corresponds to at least one explosion-proof valve.

[0011] In some embodiments, the top surface of the first protective rubber strip fits with the bottom surfaces of the battery cell groups on both sides of the gap between the corresponding battery cell groups, and the top surface of the first protective rubber strip is slightly higher than the inner surface of the bottom wall of the battery box; the bottom wall of the battery box is provided with multiple rubber grooves, and all the first protective rubber strips are arranged in all the rubber grooves one by one.

[0012] In some embodiments, the top surface of the first protective rubber strip is 1mm-3mm higher than the inner surface of the bottom wall of the battery box; the width of the first protective rubber strip is 2-4 times its height; the spacing between the pressure relief valve of the battery cell group and the bottom wall of the battery box 1 is 1.2mm-1.8mm; the width of the rubber groove and the first protective rubber strip are both greater than the width of the gap between the battery cell groups.

[0013] In some embodiments, the tops of the first partition plate and the second partition plate are respectively separated from the top wall of the battery box, and the top of the first partition plate is provided with a second protective rubber strip made of an expandable flame retardant material, and the second protective rubber strip extends along the length direction of the first partition plate. The top of the second partition plate is provided with a third protective rubber strip made of an expandable flame retardant material, and the third protective rubber strip extends along the length direction of the second partition plate.

[0014] The utility model also provides an electric device, which comprises the battery pack.

[0015] The above technical solution of the utility model has the following beneficial effects:

[0016] Since at least a portion of the adjacent battery cells are filled with expandable flame retardant adhesive, when a battery cell filled with expandable flame retardant adhesive around it experiences thermal runaway, the heat generated by it causes the expandable flame retardant adhesive to expand, and the expandable flame retardant adhesive that expands due to heat will push the surrounding battery cells away, thereby increasing the horizontal spacing between the battery cell in thermal runaway and other surrounding battery cells, thereby increasing the heat transfer resistance. At the same time, the expandable flame retardant adhesive that expands due to heat is isolated between the battery cell in thermal runaway and other surrounding battery cells, further increasing the heat transfer resistance and preventing other surrounding battery cells from being damaged by heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the assembly of a battery pack in one embodiment of the utility model;

[0018] Figure 2 It is a schematic diagram of the distribution of the battery cells in one embodiment of the utility model;

[0019] Figure 3 It is a partial schematic diagram of the distribution position of the intumescent flame retardant adhesive in one embodiment of the utility model;

[0020] Figure 4 It is a schematic diagram of the arrangement of the first protective rubber strip in one embodiment of the utility model;

[0021] Figure 5 This is a schematic diagram of the distribution position of the first protective rubber strip in one embodiment of the utility model;

[0022] Figure 6 It is a cross-sectional schematic diagram of a battery pack in one embodiment of the utility model.

[0023] Description of Reference Numerals

[0024] 1. Battery box; 11. Box cover; 12. Box body; 13. Explosion-proof valve; 14. First partition plate; 15. Second partition plate; 2. Battery cell; 3. Battery cell group; 31. Gap between battery cell groups; 4. Expandable flame-retardant rubber; 5. First protective rubber strip; 6. Second protective rubber strip; 7. Third protective rubber strip; 8. Pressure relief valve. DETAILED DESCRIPTION

[0025] The features and exemplary embodiments of various aspects of the utility model will be described in detail below. In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the utility model, rather than to limit the utility model. For those skilled in the art, the utility model can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the utility model by showing examples of the utility model.

[0026] like Figures 1 to 3 As shown, the utility model provides a battery pack, which includes a battery box 1 and a plurality of battery cells 2, all of which are horizontally installed in the battery box 1. An expandable flame retardant adhesive 4 is filled between at least a portion of the battery cells 2 adjacent to each other; the expandable flame retardant adhesive 4 can expand after being heated and push the surrounding battery cells 2 away, so as to increase the horizontal spacing between the battery cell 2 that has thermal runaway and other surrounding battery cells 2.

[0027] Specifically, since at least a portion of the battery cells 2 adjacent to each other are filled with the expanding flame retardant adhesive 4, when a battery cell 2 with the expanding flame retardant adhesive 4 around it undergoes thermal runaway, the heat generated by it causes the expanding flame retardant adhesive 4 to expand due to the heat, and the expanding flame retardant adhesive 4 that expands due to the heat will push the surrounding battery cells 2 away, thereby increasing the horizontal spacing between the battery cell 2 in thermal runaway and other surrounding battery cells 2, thereby increasing the heat transfer resistance. At the same time, the expanding flame retardant adhesive 4 that expands due to the heat is isolated between the battery cell 2 in thermal runaway and other surrounding battery cells 2, further increasing the heat transfer resistance and preventing other surrounding battery cells 2 from being damaged by heat.

[0028] In addition, it should be noted that the battery box 1 is usually provided with an explosion-proof valve 13, and the high-temperature gas generated by the thermal runaway battery cell 2 will be discharged through the explosion-proof valve 13, but in the process of high-temperature gas discharge, the battery cell 2 itself is also conducting heat to the surroundings. Increasing the heat transfer resistance of the battery cell 2 that has thermal runaway can prevent other surrounding battery cells 2 from being damaged by heat during the high-temperature gas discharge process. Of course, the intumescent flame-retardant adhesive 4 is made of intumescent flame-retardant material.

[0029] In some embodiments of the present invention, the spaces between all the battery cells 2 are filled with expandable flame-retardant adhesive 4 .

[0030] Specifically, when any battery cell 2 experiences thermal runaway, the heat of the battery cell 2 experiencing thermal runaway will be transferred to the surroundings, and the heat will cause the expandable flame retardant adhesive 4 around the battery cell 2 experiencing thermal runaway to expand, thereby increasing the distance between the battery cell 2 experiencing thermal runaway and other surrounding battery cells 2, thereby providing protection for other battery cells 2.

[0031] In some embodiments of the present invention, the vertical height of the expandable flame retardant adhesive 4 after thermal expansion is less than or equal to the vertical height of the battery core 2 .

[0032] Specifically, the vertical height of the expanded flame retardant adhesive 4 after thermal expansion does not exceed the vertical height of the battery cell 2. If the vertical height of the expanded flame retardant adhesive 4 after thermal expansion exceeds the vertical height of the battery cell 2, it is difficult to further improve the protection effect of the part of the expanded flame retardant adhesive 4 that is higher than the battery cell 2. Therefore, under the premise that the expanded flame retardant adhesive 4 can effectively protect other surrounding battery cells 2, the vertical height of the expanded flame retardant adhesive 4 after thermal expansion should not exceed the vertical height of the battery cell 2, so as to reduce the use of the expanded flame retardant adhesive 4 as much as possible and reduce the cost of the battery pack.

[0033] like Figure 6 As shown, in some embodiments of the present invention, the vertical height of the expandable flame retardant adhesive 4 before thermal expansion is less than or equal to half of the vertical height of the battery core 2 .

[0034] Specifically, under the premise that the expanded flame retardant adhesive 4 can effectively protect other surrounding battery cells 2, the use amount of the expanded flame retardant adhesive 4 is reduced as much as possible to reduce the cost of the battery pack. Therefore, the vertical height of the expanded flame retardant adhesive 4 before expansion should not exceed half of the vertical height of the battery cell 2.

[0035] In some embodiments, the vertical height of the expandable flame retardant adhesive 4 before expansion is equal to half of the vertical height of the battery cell 2, and the vertical expansion rate of the expandable flame retardant adhesive 4 is 200%, so the vertical height of the expandable flame retardant adhesive 4 after expansion is equal to the vertical height of the battery cell 2, so that the expandable flame retardant adhesive 4 can wrap the entire side wall of the battery cell 2 that has thermal runaway.

[0036] In some embodiments of the present invention, the expandable flame retardant adhesive 4 is configured so that the horizontal spacing between the opposite side walls of two adjacent battery cells 2 after the expandable flame retardant adhesive 4 is thermally expanded is 1.2-1.5 times the horizontal spacing before the expandable flame retardant adhesive 4 is thermally expanded.

[0037] Specifically, the horizontal spacing of the relative side walls of two adjacent battery cells 2 refers to: for two adjacent battery cells 2, the horizontal spacing between the side wall of the first battery cell 2 facing the second battery cell 2 and the side wall of the second battery cell 2 facing the first battery cell 2. After the expansion due to heat, the expanding flame retardant adhesive 4 will push away the surrounding battery cells 2. If the expansion amplitude of the expanding flame retardant adhesive 4 in the horizontal direction is too large, it may cause the surrounding battery cells 2 to be squeezed and deformed. The horizontal spacing between two adjacent battery cells 2 after the expanding flame retardant adhesive 4 is thermally expanded is 1.2-1.5 times the horizontal spacing before the expanding flame retardant adhesive 4 is thermally expanded, which not only helps to effectively protect other surrounding battery cells 2, but also does not cause other surrounding battery cells 2 to be compressed and deformed.

[0038] like Figure 2 As shown, in some embodiments of the utility model, the battery box 1 has a accommodating cavity inside, in which a first partition plate 14 extending along the width direction W of the battery box and a second partition plate 15 extending along the length direction L of the battery box are provided. The first partition plate 14 and the second partition plate 15 divide the accommodating cavity into four accommodating areas, each of which is equipped with a portion of the battery cells 2.

[0039] Specifically, the rectangular battery box 1 includes a bottom wall, a top wall, two side walls spaced apart in the length direction, and two side walls spaced apart in the width direction. The accommodating cavity is located between the bottom wall, the top wall, and the four side walls. There is one first partition plate 14, which is located between the side walls in the two width directions. The length direction of the first partition plate 14 is consistent with the width direction W of the battery box, and the bottom wall and the side walls in the two width directions are connected to the first partition plate 14. There are two second partition plates 15, each of which is located between the first partition plate 14 and a side wall in the length direction, and the first partition plate 14, the bottom wall, and the side walls in the length direction are connected to the second partition plate 15. The first partition plate 14 and the second partition plate 15 can strengthen the structural strength of the battery box 1.

[0040] In some embodiments, the rectangular battery box 1 includes a box body 12 and a box cover 11, wherein the box body 12 has an upward opening and the box cover 11 seals the opening of the box body 12. The accommodating cavity is disposed in the box body 12 and communicates with the opening of the box body 12.

[0041] like Figure 4 and Figure 5 As shown, in some embodiments of the utility model, in each accommodation area, all the battery cells 2 are distributed in multiple rows along the width direction of the battery box 1, and each row of battery cells 2 is a battery cell group 3, and the pressure relief valve 8 of the battery cell group 3 faces the bottom wall of the battery box 1. The gap between two adjacent battery cell groups 3 is a battery cell group gap 31, and a first protective rubber strip 5 made of expanded flame retardant material and extending along the battery cell group gap 31 is arranged below each battery cell group gap 31, and the pressure relief valves 8 of two adjacent battery cell groups 3 are separated by the corresponding first protective rubber strip 5. A plurality of explosion-proof valves 13 are arranged on the side wall of the battery box 1, and the pressure relief valve 8 of each battery cell group 3 corresponds to at least one explosion-proof valve 13.

[0042] Specifically, the first partition plate 14 and the second partition plate 15 divide the accommodating cavity into four accommodating areas, and the four accommodating areas can have the same size of accommodating space. A plurality of battery cell groups 3 are installed in each accommodating area, and all battery cell groups 3 are arranged at intervals along the width direction W of the battery box, and each battery cell group 3 extends along the length direction L of the battery box. A plurality of first protective rubber strips 5 are provided between the battery cell groups 3 and the bottom wall of the battery box 1, and all the first protective rubber strips 5 correspond to all the gaps 31 of the battery cell groups one by one. Each first protective rubber strip 5 extends along the gap 31 of the battery cell group corresponding thereto. In the width direction W of the battery box, the pressure relief valves 8 of the battery cell groups 3 and the first protective rubber strips 5 are alternately distributed, so the pressure relief valves 8 of two adjacent battery cell groups 3 are separated by a first protective rubber strip 5. Two adjacent first protective rubber strips 5 form a protective channel, and the high-temperature gas released from the pressure relief valve 8 can flow to the corresponding explosion-proof valve 13 through the protective channel. The explosion-proof valve 13 can be arranged on the side wall of the length direction L of the battery box.

[0043] In this embodiment, when a battery cell 2 of a certain battery cell group 3 experiences thermal runaway, a large amount of high-temperature gas leaks out from the pressure relief valve 8 of the battery cell 2. These high-temperature gases will be confined between the first protective rubber strips 5 on both sides of the pressure relief valve 8, that is, these high-temperature gases will be confined in the protective channel between the two first protective rubber strips 5 to prevent the high-temperature gas from diffusing to the adjacent battery cell group 3. As the high-temperature gas continues to leak out, the high-temperature gas flows along the protective channel to the corresponding explosion-proof valve 13. Moreover, the first protective rubber strip 5 will expand horizontally after contacting the high-temperature gas. The horizontally expanded first protective rubber strip 5 will compress the space of the protective channel, so that the high-temperature gas is discharged from the protective channel as soon as possible to prevent the high-temperature gas from accumulating in the protective channel.

[0044] It should be noted that, for the battery cell group 3 at the outermost edge, a protective channel is formed between the first protective rubber strip 5 and the side wall, and a protective channel can also be formed between the first protective rubber strip 5 and the second partition plate 15 .

[0045] like Figure 6 As shown, in some embodiments of the present invention, the top surface of the first protective rubber strip 5 fits with the bottom surface of the cell group 3 on both sides of the corresponding cell group gap 31, and the top surface of the first protective rubber strip 5 is slightly higher than the inner side surface of the bottom wall of the battery box 1.

[0046] Specifically, a cell group gap 31 is defined between two adjacent cell groups 3, so each first protective rubber strip 5 corresponds to two cell groups 3. The width of the first protective rubber strip 5 is greater than the cell group gap 31, so the bottom surface of the side of the cell group 3 can be attached to the top surface of the first protective rubber strip 5. Therefore, the cell group 3 can also be bonded to the bottom wall of the battery box 1 through the first protective rubber strip 5. The top surface of the first protective rubber strip 5 is slightly higher than the inner surface of the bottom wall of the battery box 1. On the one hand, the first protective rubber strip 5 can support the cell group 3 to a certain height to prevent the pressure relief valve 8 from abutting against the bottom wall of the battery box 1; on the other hand, the vertical expansion effect of the first protective rubber strip 5 is not obvious, which avoids excessive vertical displacement of the battery cell 2.

[0047] In some embodiments, the top surface of the first protective rubber strip 5 is 1 mm to 3 mm higher than the inner side surface of the bottom wall of the battery box 1. In some embodiments, the distance between the pressure relief valve 8 of the battery cell group 3 and the bottom wall of the battery box 1 may be 1.2 mm to 1.8 mm.

[0048] In some embodiments, the width of the first protective rubber strip 5 may be 2-4 times of its height, so that the first protective rubber strip 5 expands mainly in the horizontal direction after being heated.

[0049] In some embodiments, the battery cell 2 is cylindrical, so the battery cell group gap 31 is a wavy gap. Correspondingly, the first protective rubber strip 5 is a wavy rubber strip. In other embodiments, the battery cell 2 can also be a rectangular parallelepiped, so the battery cell group gap 31 is a straight line, and the first protective rubber strip 5 is also a straight line.

[0050] In some embodiments of the present invention, a plurality of adhesive grooves are provided on the bottom wall of the battery box 1 , and all first protective adhesive strips 5 are disposed in all adhesive grooves in a one-to-one correspondence.

[0051] Specifically, the bottom of the first protective rubber strip 5 is bonded in the rubber groove. The rubber groove can facilitate the installation and fixation of the first protective rubber strip 5. Of course, the rubber groove also extends along the gap 31 of the battery cell group, so that the shape of the rubber groove is compatible with the shape of the first protective rubber strip 5.

[0052] In some embodiments, the width of the glue groove and the width of the first protective rubber strip 5 are both greater than the width of the battery cell group gap 31 , for example, the width of the glue groove may be 10 mm-15 mm.

[0053] like Figure 2 As shown, in some embodiments of the utility model, the tops of the first partition plate 14 and the second partition plate 15 are respectively spaced apart from the top wall of the battery box 1, and the top of the first partition plate 14 is provided with a second protective rubber strip 6 made of an expandable flame retardant material, and the second protective rubber strip 6 extends along the length direction of the first partition plate 14, and the top of the second partition plate 15 is provided with a third protective rubber strip 7 made of an expandable flame retardant material, and the third protective rubber strip 7 extends along the length direction of the second partition plate 15.

[0054] Specifically, the second protective rubber strip 6 can be sealed between the first partition plate 14 and the top wall of the battery box 1 after being heated and expanded, and the third protective rubber strip 7 can be sealed between the second partition plate 15 and the top wall of the battery box 1 after being heated and expanded, so that the adjacent accommodation areas are isolated to prevent the high-temperature gas from diffusing to the adjacent accommodation areas. The length of the second protective rubber strip 6 can be equal to the length of the first partition plate 14, and the length of the third protective rubber strip 7 can be equal to the length of the second partition plate 15.

[0055] In some embodiments, the vertical height of the first partition plate 14 and the second partition plate 15 is equal to half of the vertical height of the accommodating cavity, and the expansion rate of the second protective rubber strip 6 and the third protective rubber strip 7 is between 2-20 times. The first partition plate 14 and the second partition plate 15 with a relatively low height are combined with the second protective rubber strip 6 and the third protective rubber strip 7 with a high expansion rate, which helps to reduce the total weight of the battery pack.

[0056] It should be noted that, as a preferred embodiment, the intumescent flame retardant glue 4 and the first protective rubber strip 5 have different expansion coefficients and expansion trigger temperatures, so the intumescent flame retardant glue 4 and the first protective rubber strip 5 can be made of different intumescent flame retardant materials. The second protective rubber strip 6 and the third protective rubber strip 7 have the same expansion coefficient and expansion trigger temperature, so the second protective rubber strip 6 and the third protective rubber strip 7 can be made of the same intumescent flame retardant material. However, the temperature for triggering expansion needs to be determined according to the characteristics of the battery cell 2 or the environment in which the battery pack is used. Those skilled in the art can select a suitable existing intumescent flame retardant material according to the trigger temperature. The existing intumescent flame retardant material is preferably an epoxy intumescent flame retardant material, but is not limited to polyurethane and silicon-based flame retardant materials. For example, a halogen-free intumescent flame retardant material with a publication number of CN115746559A, a self-crosslinking intumescent flame retardant material with a publication number of CN104327368A, or a metal ion-containing halogen-free intumescent flame retardant composition with a publication number of CN106674529A can be selected.

[0057] The utility model also provides an electric device, which includes the above-mentioned battery pack. The electric device can be any device in the art that is adapted to the above-mentioned battery pack, for example, it can be a new energy vehicle or an energy storage device, etc., and the utility model does not limit it.

[0058] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core ideas of the utility model. The above are only preferred implementation methods of the utility model. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the utility model, they can make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without improvement, should be regarded as the protection scope of the utility model.

Claims

1. A battery pack, characterized in that: The invention comprises a battery box (1) and a plurality of battery cells (2), wherein all the battery cells (2) are horizontally installed in the battery box (1); an expanding flame retardant adhesive (4) is filled between at least a portion of the battery cells (2) adjacent to each other; the expanding flame retardant adhesive (4) can expand after being heated and push away the surrounding battery cells (2), so as to increase the horizontal distance between the battery cell (2) experiencing thermal runaway and other surrounding battery cells (2).

2. The battery pack according to claim 1, characterized in that: The expansion flame retardant glue (4) is filled between all the battery cells (2).

3. The battery pack according to claim 1, characterized in that: The vertical height of the expandable flame retardant adhesive (4) after thermal expansion is less than or equal to the vertical height of the battery core (2).

4. The battery pack according to claim 3, characterized in that: The vertical height of the expandable flame-retardant adhesive (4) before thermal expansion is less than or equal to half the vertical height of the battery core (2).

5. The battery pack according to claim 1, characterized in that: The expansion flame retardant adhesive (4) is arranged so that the horizontal spacing between the opposite side walls of two adjacent battery cells (2) after the expansion flame retardant adhesive (4) is thermally expanded is 1.2-1.5 times the horizontal spacing before the expansion flame retardant adhesive (4) is thermally expanded.

6. The battery pack according to any one of claims 1 to 5, characterized in that: The battery box (1) has a receiving cavity inside, and a first partition plate (14) extending along the width direction of the battery box (1) and a second partition plate (15) extending along the length direction of the battery box (1) are provided in the receiving cavity, and the first partition plate (14) and the second partition plate (15) divide the receiving cavity into four receiving areas, each of which is equipped with a portion of the battery cell (2).

7. The battery pack according to claim 6, characterized in that: In each of the accommodating areas, all of the battery cells (2) are spaced apart in multiple rows along the width direction of the battery box (1), each row of the battery cells (2) constitutes a battery cell group (3), and the pressure relief valve (8) of the battery cell group (3) faces the bottom wall of the battery box (1); The gap between two adjacent battery cell groups (3) is a battery cell group gap (31), a first protective rubber strip (5) made of an expandable flame-retardant material and extending along the battery cell group gap (31) is arranged below each battery cell group gap (31), and the pressure relief valves (8) of the two adjacent battery cell groups (3) are separated by the corresponding first protective rubber strip (5); A plurality of explosion-proof valves (13) are provided on the side wall of the battery box (1), and the pressure relief valve (8) of each battery cell group (3) corresponds to at least one of the explosion-proof valves (13).

8. The battery pack according to claim 7, characterized in that: The top surface of the first protective rubber strip (5) is in contact with the bottom surfaces of the battery cell group (3) on both sides of the corresponding battery cell group gap (31), and the top surface of the first protective rubber strip (5) is slightly higher than the inner side surface of the bottom wall of the battery box (1); The bottom wall of the battery box (1) is provided with a plurality of glue grooves, and all the first protective rubber strips (5) are arranged in all the glue grooves in a one-to-one correspondence.

9. The battery pack according to claim 8, characterized in that: The top surface of the first protective rubber strip (5) is 1 mm to 3 mm higher than the inner side surface of the bottom wall of the battery box (1); The width of the first protective rubber strip (5) is 2-4 times its height; The distance between the pressure relief valve (8) of the battery cell group (3) and the bottom wall of the battery box (1) is 1.2 mm to 1.8 mm; The widths of the adhesive groove and the first protective adhesive strip (5) are both greater than the width of the battery cell group gap (31).

10. The battery pack according to claim 6, characterized in that: The tops of the first partition plate (14) and the second partition plate (15) are respectively spaced apart from the top wall of the battery box (1); the top of the first partition plate (14) is provided with a second protective rubber strip (6) made of an expanding flame retardant material, and the second protective rubber strip (6) extends along the length direction of the first partition plate (14); the top of the second partition plate (15) is provided with a third protective rubber strip (7) made of an expanding flame retardant material, and the third protective rubber strip (7) extends along the length direction of the second partition plate (15).

11. An electrical device, characterized in that: A battery pack comprising any one of claims 1-10.

Images