Battery monomer, battery pack and power utilization device

Abstract

The utility model relates to a single battery, a battery pack and an electric device, the single battery comprises a battery cell, a first side plate, a second side plate and a third side plate, the first side plate and the second side plate are respectively arranged on two sides of the third side plate in a first direction, and the third side plate, the first side plate and the second side plate are integrally formed; a containing groove is defined by the third side plate, the first side plate and the second side plate, and at least part of the battery cell is contained in the containing groove; creases are formed between the third side plate and the first side plate and between the third side plate and the second side plate; the crease comprises a first section and a second section which are arranged in the second direction, a gap is formed between the first section and the second section in the third direction, the third direction is perpendicular to the third side plate, and the second direction is the extending direction of the crease; according to the utility model, multiple sections of creases with height difference are arranged, so that the deformation of the shell is inhibited, the appearance is kept stable, and the battery cell can be assembled into the shell; and meanwhile, the battery cell is prevented from shaking, tabs are prevented from being pulled, and the service life is prolonged.

Description

Technical Field

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

[0002] The battery cell includes a battery cell and a shell. The shell includes a U-shaped shell and a cover plate. The U-shaped shell includes a web and wing plates on both sides of the web. It was found that the end of the two wing plates that is not connected to the web is prone to diverging outward or folding inward, which will cause the structure of the U-shaped shell to be unstable, that is, the size of the U-shaped shell is unstable, which is not conducive to the subsequent installation of the cover plate. Utility Model Content

[0003] To this end, the technical problem to be solved by the present invention is to overcome the technical difficulty in the existing technology that the deformation of the shell causes difficulty in assembling the cover plate, and to provide a battery cell, a battery pack and an electrical device that effectively suppress deformation such as outward or inward folding of the shell, have high shape stability, and higher efficiency in assembling the battery cell into the shell.

[0004] In a first aspect, to solve the above-mentioned technical problems, the present invention provides a battery cell, comprising a battery cell and a housing, wherein the housing comprises a first side plate, a second side plate, and a third side plate, wherein the first side plate and the second side plate are respectively arranged on either side of the third side plate in a first direction, and the third side plate, the first side plate, and the second side plate are integrally formed; the third side plate, the first side plate, and the second side plate enclose a receiving groove, and at least a portion of the battery cell is received in the receiving groove;

[0005] A fold is formed between the third side panel and the first side panel, and between the third side panel and the second side panel; the fold includes a first segment and a second segment arranged along a second direction, and in the third direction, there is a gap between the first segment and the second segment, the third direction is perpendicular to the third side panel, and the second direction is the extension direction of the fold.

[0006] In one embodiment of the present invention, in the third direction, the distance between the first section and the second section is H1,2mm≤H1≤8mm.

[0007] In one embodiment of the present invention, the fold further includes a third section, the second section is located between the first section and the third section, and the first section and the third section are arranged flush.

[0008] In one embodiment of the present invention, in the second direction, the length of the first segment is L1, the distance between the first segment and the third segment is L2, the length of the third segment is L3, 2L1≤L2≤10L1, 30mm≤L1≤100mm, and L1=L3.

[0009] In one embodiment of the present invention, the accommodating groove has a first accommodating chamber and a second accommodating chamber, and the first accommodating chamber and the second accommodating chamber are respectively located on both sides of the second section in the second direction; in the third direction, the depth of the first accommodating chamber is equal to the distance between the first section and the second section, and the depth of the second accommodating chamber is equal to the distance between the third section and the second section; the positive electrode ear and the negative electrode ear of the battery cell are respectively accommodated in the first accommodating chamber and the second accommodating chamber.

[0010] In one embodiment of the present invention, the fold also includes a fourth section, the second section is provided with at least two sections, and the fourth section is provided between any two adjacent second sections; at least one fourth section and at least two second sections are located between the first section and the third section; wherein the fourth section and the first section are arranged flush, or, in the third direction, the fourth section is located between the second section and the first section.

[0011] In one embodiment of the present invention, the third side panel has at least one first connecting section, and the fourth section is formed between the first connecting section and the first side panel and between the first connecting section and the second side panel, wherein at least one of the first connecting sections is provided with an explosion-proof valve.

[0012] In one embodiment of the present invention, a heat sink is further included. The heat sink is arranged on a side of the third side plate away from the accommodating groove, and the heat sink and the third side plate are arranged in close contact.

[0013] In one embodiment of the present invention, it also includes a first cover plate assembly, a second cover plate assembly and a fourth side plate, the first cover plate assembly and the second cover plate assembly respectively seal the two openings in the second direction of the shell, the fourth side plate seals an opening in the third direction of the shell, and the fourth side plate connects the first cover plate assembly and the second cover plate assembly, wherein the third direction and the second direction are perpendicular to each other; the battery cell is accommodated in the space surrounded by the accommodating groove, the first cover plate assembly, the second cover plate assembly and the fourth side plate; the positive electrode ear of the battery cell is electrically connected to the first cover plate assembly through the first adapter, and the negative electrode ear of the battery cell is electrically connected to the second cover plate assembly through the second adapter.

[0014] In a second aspect, the present invention further provides a battery pack, comprising a heat sink and a battery cell as described in any of the above embodiments, wherein the heat sink is arranged on a side of the third side plate away from the accommodating groove, and the heat sink and the third side plate are arranged in close contact.

[0015] In a third aspect, the present invention further provides an electrical device comprising the battery cell described in any one of the above embodiments.

[0016] The above technical solution of the utility model has the following beneficial effects compared with the prior art:

[0017] The battery cell, battery pack and electrical device described in the present invention improve the folds of the outer shell so that the outer shell has multiple folds of different heights. The multiple folds of inconsistent heights are used to suppress shell deformation, maintain a stable appearance, and facilitate assembly with a cover plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the content of the utility model easier to understand, the utility model is further described in detail below based on the specific embodiments of the utility model in conjunction with the accompanying drawings, wherein:

[0019] Figure 1 This is a schematic structural diagram of a battery housing in the prior art;

[0020] Figure 2 This is a schematic structural diagram of the housing in Example 1 of the present utility model;

[0021] Figure 3 This is a cross-sectional view of the receiving tank in the first embodiment of the present invention;

[0022] Figure 4 This is a schematic structural diagram of a battery cell in Example 1 of the present utility model;

[0023] Figure 5 This is a cross-sectional view of a battery cell in the first embodiment of the present invention;

[0024] Figure 6 This is an exploded view of a battery cell in Example 1 of the present utility model;

[0025] Figure 7 This is a schematic structural diagram of the housing and explosion-proof valve in the second embodiment of the present utility model;

[0026] Figure 8 This is a cross-sectional view of the receiving tank in the second embodiment of the present invention;

[0027] Figure 9 Schematic diagram of the structure of the mold used to make creases.

[0028] Explanation of the reference numerals in the specification: 1. battery cell; 11. positive electrode ear; 12. negative electrode ear; 2. outer casing; 21. first side panel; 22. second side panel; 23. third side panel; 2301. first connecting section; 2302. second connecting section; 3. accommodating groove; 31. first accommodating chamber; 32. second accommodating chamber; 4. fold; 41. first section; 42. second section; 43. third section; 44. fourth section; 45. fifth section; 5. explosion-proof valve; 6. heat dissipation element; 71. first cover plate assembly; 7101. first adapter; 7102. first cover plate; 72. second cover plate assembly; 7201. second adapter; 7202. second cover plate; 8. fourth side panel. DETAILED DESCRIPTION

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0030] Example 1

[0031] Reference Figures 2 to 6 As shown, the present invention provides a battery cell comprising a battery cell 1 and a housing located outside the battery cell 1. The housing maintains dimensional stability and is not easily deformed, facilitating assembly of the battery cell. Compared to conventional battery cell structures, the housing reduces the difficulty of assembly and improves installation efficiency.

[0032] Reference Figure 1 The figure shows a prior art battery housing suitable for blade batteries. The inventors discovered that the battery housing is a "U"-shaped structure formed by three side panels, with a bending axis formed between two adjacent side panels. Because the two opposing side panels in the battery housing are easily forced to open or close around the bending axis, they are prone to deformation, making subsequent assembly with the cover plate difficult.

[0033] Therefore, in a preferred embodiment of the present invention, in order to solve the above-mentioned problem, the housing is improved, and the rotation is restricted by designing the bending axis to be non-linear.

[0034] Specifically, refer to Figure 2 and Figure 3As shown, the shell 2 includes a first side panel 21, a second side panel 22 and a third side panel 23. The third side panel 23, the first side panel 21 and the second side panel 22 are integrally formed. The third side panel 23, the first side panel 21 and the second side panel 22 form a receiving groove 3, and at least part of the battery cell 1 is received in the receiving groove 3; wherein, a fold 4 is formed between the third side panel 23 and the first side panel 21 and between the third side panel 23 and the second side panel 22; the fold 4 includes a first section 41 and a second section 42 arranged along the second direction, and in the third direction, there is a spacing between the first section 41 and the second section 42. The third direction is perpendicular to the third side panel 23, and the second direction is the extension direction of the fold 4.

[0035] In this embodiment, since the first section 41 and the second section 42 of the fold 4 have a height difference in the third direction, the first side panel 21 and the second side panel 22 cannot easily rotate around the fold 4, thereby inhibiting the first side panel 21 and the second side panel 22 from folding outward or folding inward. In addition, since the first section 41 and the second section 42 of the fold 4 have a height difference in the third direction, a concave-convex structure is formed at the fold of the shell 2, which increases the structural strength.

[0036] It should be noted that, in order to facilitate the production of the fold 4, the fold 4 is formed by stamping a mold, and the specific structure of the mold can be as follows: Figure 9 shown.

[0037] Furthermore, although the height difference between the first section 41 and the second section 42 of the fold 4 can inhibit the first side panel 21 and the second side panel 22 from folding outward or folding inward, when the height difference H1 between the first section 41 and the second section 42 is too small, the inhibition effect is not obvious. When the height difference H1 between the first section 41 and the second section 42 is too large, too much internal space of the shell 2 is occupied, thereby affecting the utilization of the internal space of the shell 2 and the energy density of the battery cell. Therefore, it is designed that in the third direction, the spacing between the first section 41 and the second section 42 is H1, 2mm≤H1≤8mm. At this time, not only can it have a good inhibition effect, but it can also reduce the impact on the energy density of the battery cell. Specifically, the value of H1 can be 3mm or 4mm or 5mm or 6mm or 7mm.

[0038] Further, see Figure 8 As shown, the fold 4 also includes a fifth section 45, and the first section 41 and the second section 42 are connected by the fifth section 45. The angle between the fifth section 45 and the second section 42 is α. For the convenience of processing, α is designed to be ≥90°; in addition, in order to ensure the height difference H1 between the first section 41 and the second section 42, α is designed to be ≤150°.

[0039] Furthermore, in order to better prevent the first side plate 21 and the second side plate 22 from folding outward or folding inward, refer to Figure 3 As shown, the fold 4 further includes a third section 43 , the second section 42 is located between the first section 41 and the third section 43 , and the first section 41 and the third section 43 are arranged flush.

[0040] In this embodiment, when the first side panel 21 and the second side panel 22 tend to rotate around the first section 41, the third section 43 of the fold will inhibit the rotation of the first side panel 21 and the second side panel 22. Correspondingly, when the first side panel 21 and the second side panel 22 tend to rotate around the third section 43, the first section 41 of the fold will also inhibit the rotation of the first side panel 21 and the second side panel 22. By inhibiting both ends of the second direction of the shell, it is ensured that the first side panel 21 and the second side panel 22 will not fold outward or fold inward.

[0041] Specifically in this embodiment, see Figure 2 As shown, the fold 4 also includes a fifth segment 45, which connects the first segment 41 and the second segment 42, as well as the second segment 42 and the third segment 43. Accordingly, the third side panel includes a third connecting segment, a second connecting segment 2302, and a fourth connecting segment arranged along the second direction. The second connecting segment 2302 is located between the third and fourth connecting segments. The second connecting segment 2302 and the third connecting segment, as well as the second connecting segment 2302 and the fourth connecting segment, are connected by the fifth connecting segment. The second segment 42 is formed between the second connecting segment 2303 and the first side panel 21, as well as between the second connecting segment 2303 and the second side panel 22. The first segment 43 is formed between the third connecting segment and the first side panel 21, as well as between the third connecting segment and the second side panel 22. The third segment 43 is formed between the fourth connecting segment and the first side panel 21, as well as between the fourth connecting segment and the second side panel 22. The fifth segment 45 is formed between the fifth connecting segment and the first side panel 21, as well as between the fifth connecting segment and the second side panel 22.

[0042] Furthermore, when the first section 41 and the third section 43 of the fold 4 are too long, the second section of the fold 4 is not very effective in suppressing the inward or outward folding of the two ends of the shell 2 in the second direction. When the first section 41 and the third section 43 of the fold 4 are too short, it is not conducive to processing. Figure 3 As shown, in the second direction, the length of the first section 41 is L1, the distance between the first section 41 and the third section 43 is L2, the length of the third section 43 is L3, 2L1≤L2≤10L1, 30mm≤L1≤100mm, L1=L3, at this time, it can ensure the structural stability of the shell 2 and ensure the convenience of crease bending processing. Specifically, L1 can take a value of 40mm or 45mm or 50mm or 55mm or 60mm or 65mm or 70mm or 75mm or 80mm or 85mm or 90mm or 95mm.

[0043] Furthermore, the battery cell 1 includes a battery cell body, a positive electrode ear 11 and a negative electrode ear 12. The battery cell body has a first end surface facing the third side plate 23. The positive electrode ear 11 and the negative electrode ear 12 are both led out from the first end surface of the battery cell body. In order to adapt to the assembly of the battery cell and maximize the utilization of the internal space of the shell, see Figure 5 and Figure 3 As shown, the middle portion of the third side plate 23 is designed to be recessed toward the direction close to the battery cell 1, the first section 41 and the third section 43 are arranged flush, and in the third direction, the second section 42 is arranged closer to the first end face of the battery cell body than the first section 41, that is, the accommodating groove 3 has a first accommodating cavity 31 and a second accommodating cavity 32, and the first accommodating cavity 31 and the second accommodating cavity 32 are respectively located on both sides of the second direction of the second section 42; in the third direction, the depth of the first accommodating cavity 31 is equal to the distance between the first section 41 and the second section 42, and the depth of the second accommodating cavity 32 is equal to the distance between the third section 43 and the second section 42, and the first accommodating cavity 31 and the second accommodating cavity 32 are configured to accommodate the positive electrode ear 11 and the negative electrode ear 12, respectively.

[0044] In this embodiment, the first accommodating chamber 31 is formed by utilizing the height difference between the first section 41 and the second section 42, and the second accommodating chamber 32 is formed by utilizing the height difference between the third section 43 and the second section 42, so that the positive pole ear 11 and the pole ear connection part of the first adapter 7101 are both located in the first accommodating chamber 31, and correspondingly, the negative pole ear 12 and the second adapter 7201 are both located in the second accommodating chamber 32, thereby making full use of the space inside the outer shell 2; at the same time, the second section 42, which is closer to the battery cell electrode in the third direction, can also fix the battery cell body in an oscillating working condition to avoid pulling the pole ear during shaking.

[0045] It should be noted that when the first section 41 and the third section 43 are arranged flush, they can also be designed in the third direction, with the second section 42 being arranged farther away from the first end face of the battery cell body than the first section 41. That is to say, the middle part of the third side plate 23 is designed to bulge outward in the direction away from the battery cell 1. At this time, in order to maximize the utilization of the internal space of the outer shell 2, the positive electrode ear 11 and the negative electrode ear 12 can be designed to be accommodated in the space between the second section 42 and the first end face of the battery cell body.

[0046] Further, refer to Figures 4 to 6As shown, the battery cell also includes a first cover plate assembly 71, a second cover plate assembly 72, a fourth side plate 8, a first adapter 7101 and a second adapter 7201, the first cover plate assembly 71 and the second cover plate assembly 72 respectively seal the two openings in the second direction of the shell, the fourth side plate 8 is arranged opposite to the third side plate 23 in the third direction, the fourth side plate 8 seals the opening of the shell 2 opposite to the third side plate 23 in the third direction, the fourth side plate 8 connects the first cover plate assembly 71 and the second cover plate assembly 72, wherein the third direction and the second direction are perpendicular to each other; the battery cell 1 is accommodated in the space enclosed by the accommodating groove 3, the first cover plate assembly 71, the second cover plate assembly 72 and the fourth side plate 8; the positive electrode ear 11 of the battery cell 1 is electrically connected to the first cover plate assembly 71 through the first adapter 7101, and the negative electrode ear 12 of the battery cell 1 is electrically connected to the second cover plate assembly 72 through the second adapter 7201.

[0047] Specifically, see Figure 5 and Figure 6 As shown, the first cover plate assembly 71 includes a first cover plate 7102 and a first pole arranged on the first cover plate 7102, the second cover plate assembly 72 includes a second cover plate 7202 and a second pole arranged on the second cover plate 7202, the pole ear connection portion of the first adapter 7101 is electrically connected to the positive pole ear 11 of the battery cell 1, and the pole connection portion of the first adapter 7101 is electrically connected to the first pole; the pole ear connection portion of the second adapter 7201 is electrically connected to the negative pole ear 12 of the battery cell 1, and the pole connection portion of the second adapter 7201 is electrically connected to the second pole; wherein, the first cover plate 7102 and the fourth side plate 8 and the second cover plate 7202 and the fourth side plate 8 can be integrally formed or welded, depending on specific usage requirements.

[0048] In some embodiments, in order to facilitate the cooling of the battery cells, refer to Figures 4 to 6 As shown, a heat sink 6 is designed, and the heat sink 6 is arranged on the side of the third side plate 23 away from the accommodating groove 3, and the heat sink 6 and the third side plate 23 are arranged in close contact with each other; since the heat sink 6 is in close contact with the third side plate 23 in the third direction, the space inside the battery cell in the third direction is fully utilized, thereby improving the volume utilization of the system.

[0049] It should be noted that the material of the heat sink 6 can be set to a material with high thermal conductivity and strong thermal conductivity, such as a thermal pad prepared by adding thermal conductive fillers with resin as a carrier, thermal grease with organic silicone as the main raw material and adding thermal conductive materials, thermal gel mainly composed of silica gel, or thermal structural adhesive mainly composed of polyurethane and epoxy resin. In some embodiments, the heat sink 6 can also be set as a heat sink or heat spreader with a cooling medium arranged inside. The cooling medium can be set as a solid heat sink arranged in the heat sink, or as a liquid medium such as cooling water or antifreeze mixed with water and ethylene glycol, or as a gaseous medium such as air accelerated by a fan. In other embodiments, the heat sink 6 can also be set as a direct cooling device that directly utilizes a refrigerant such as tetrafluoroethane.

[0050] It should also be noted that the battery cell itself can be provided with a heat sink 6, or a heat sink 6 can be provided in the battery pack to achieve heat dissipation of the battery cell. The heat sink 6 can be in a one-to-one correspondence with the battery cells, that is, the number of heat sinks 6 is consistent with the number of battery cells. Of course, if a heat sink 6 is provided in the battery pack, it is best to design a heat sink 6 that can dissipate heat for multiple battery cells.

[0051] Example 2

[0052] Reference Figure 7 and Figure 8 As shown, the second embodiment of the present invention provides a battery cell. The difference between the battery cell in the second embodiment and the battery cell in the first embodiment is only the different arrangement of the third side plate 23 and the fold 4.

[0053] Specifically, in the second embodiment of the present invention, the fold 4 further includes a fourth section 44, and the second section 42 is provided with at least two sections; in the second direction, a fourth section 44 is provided between any two adjacent groups of second sections 42; Figure 7 As shown, at least one fourth segment 44 and at least two second segments 42 are located between the first segment 41 and the third segment 43 , wherein in the third direction, the fourth segment 44 is flush with the first segment 41 or located between the first segment 41 and the second segment 42 .

[0054] Continue, refer to Figure 7 As shown, in the second embodiment of the present invention, the third side plate 23 has at least one set of first connecting sections 2301, and a fourth section 44 is formed between the first connecting section 2301 and the first side plate 21 and between the first connecting section 2301 and the second side plate 22. At least one set of first connecting sections 2301 is provided with an explosion-proof valve 5.

[0055] Specifically in this embodiment, see Figure 7As shown, the fold 4 includes a first segment 41, two second segments 42, a fourth segment 44, and a third segment 43. The first segment 41 and the second segment 42, the third segment 43 and the second segment 42, and the fourth segment 44 and the second segment 42 are all connected by a fifth segment 45. Correspondingly, the third side panel 23 includes a third connecting segment arranged along the second direction, two second connecting segments 2302, a first connecting segment 2301, and a fourth connecting segment. The first connecting segment 2301 is located between the two second connecting segments 2302. The first connecting segment 2301 and the second connecting segment 2302, the second connecting segment 2302 and the third connecting segment, and the fourth connecting segment and the second connecting segment 2302 are all connected by the fifth connecting segment.

[0056] Example 3

[0057] The third embodiment of the present invention provides an electric device, which includes the battery cell described in the first or second embodiment. After applying the battery cell described in the above embodiment, the electric device can achieve better battery heat dissipation effect and longer battery life.

[0058] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A battery cell, characterized in that: The invention comprises a battery cell (1) and a shell (2), wherein the shell (2) comprises a first side plate (21), a second side plate (22) and a third side plate (23), wherein the first side plate (21) and the second side plate (22) are respectively arranged on both sides of the third side plate (23) in a first direction, and the third side plate (23), the first side plate (21) and the second side plate (22) are integrally formed; the third side plate (23), the first side plate (21) and the second side plate (22) are surrounded by a receiving groove (3), and at least a portion of the battery cell (1) is received in the receiving groove (3); A fold (4) is formed between the third side panel (23) and the first side panel (21), and between the third side panel (23) and the second side panel (22); the fold (4) includes a first section (41) and a second section (42) arranged along a second direction, and in the third direction, there is a spacing between the first section (41) and the second section (42), the third direction is perpendicular to the third side panel (23), and the second direction is the extension direction of the fold (4).

2. The battery cell according to claim 1, wherein: In the third direction, the distance between the first section (41) and the second section (42) is H1, 2mm≤H1≤8mm.

3. The battery cell according to claim 1 or 2, characterized in that: The fold (4) further comprises a third section (43), the second section (42) is located between the first section (41) and the third section (43), and the first section (41) and the third section (43) are arranged flush.

4. The battery cell according to claim 3, wherein: In the second direction, the length of the first section (41) is L1, the distance between the first section (41) and the third section (43) is L2, the length of the third section (43) is L3, 2L1≤L2≤10L1, 30mm≤L1≤100mm, L1=L3.

5. The battery cell according to claim 3, wherein: The accommodating groove (3) has a first accommodating cavity (31) and a second accommodating cavity (32), and the first accommodating cavity (31) and the second accommodating cavity (32) are respectively located on both sides of the second section (42) in the second direction; in the third direction, the depth of the first accommodating cavity (31) is equal to the distance between the first section (41) and the second section (42), and the depth of the second accommodating cavity (32) is equal to the distance between the third section (43) and the second section (42); the positive electrode ear (11) and the negative electrode ear (12) of the battery cell (1) are respectively accommodated in the first accommodating cavity (31) and the second accommodating cavity (32).

6. The battery cell according to claim 3, characterized in that: The fold (4) further includes a fourth section (44), the second section (42) is provided with at least two sections, and the fourth section (44) is provided between any two adjacent sections of the second section (42); at least one section of the fourth section (44) and at least two sections of the second section (42) are located between the first section (41) and the third section (43); wherein the fourth section (44) and the first section (41) are arranged flush, or, in the third direction, the fourth section (44) is located between the second section (42) and the first section (41).

7. The battery cell according to claim 6, characterized in that: The third side plate (23) has at least one first connecting section (2301), and the fourth section (44) is formed between the first connecting section (2301) and the first side plate (21), and between the first connecting section (2301) and the second side plate (22), wherein at least one of the first connecting sections (2301) is provided with an explosion-proof valve (5).

8. The battery cell according to claim 5, characterized in that The battery cell (1) further comprises a first cover plate assembly (71), a second cover plate assembly (72) and a fourth side plate (8), wherein the first cover plate assembly (71) and the second cover plate assembly (72) respectively seal the two openings in the second direction of the housing, and the fourth side plate (8) seals an opening in the third direction of the housing, and the fourth side plate (8) connects the first cover plate assembly (71) and the second cover plate assembly (72), wherein the third direction and the second direction are perpendicular to each other; the battery cell (1) is accommodated in a space enclosed by the accommodation groove (3), the first cover plate assembly (71), the second cover plate assembly (72) and the fourth side plate (8); the positive electrode ear (11) of the battery cell (1) is electrically connected to the first cover plate assembly (71) through a first adapter (7101), and the negative electrode ear (12) of the battery cell (1) is electrically connected to the second cover plate assembly (72) through a second adapter (7201).

9. A battery pack, characterized in that: The invention comprises a heat sink (6) and a battery cell according to any one of claims 1 to 8, wherein the heat sink (6) is arranged on a side of the third side plate (23) away from the accommodating groove (3), and the heat sink (6) and the third side plate (23) are arranged in close contact.

10. An electrical device, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 8.

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