Battery monomer, battery device and electric equipment

Abstract

The utility model provides a battery monomer, a battery device and electric equipment. Each battery monomer comprises a shell and an end cover; the shell comprises a first side wall; the first side wall is of an annular structure; the end cover covers one end of the shell; the edge of the end cover is bent towards the direction close to the first side wall to form a second side wall; the end face, close to the first side wall, of the second side wall is attached to and fixedly connected with the end face, close to the end cover, of the first side wall, and the cutting face of the end cover is attached to and fixedly connected with the end face, close to the end cover, of the first side wall. Therefore, the right-angle-shaped structure at the edge of the cutting surface of the end cover is prevented from becoming a rust and corrosion penetration point, and the anti-rust performance of a shell structure formed by matching the end cover and the shell is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to battery cells, battery devices, and electrical equipment. Background Art

[0002] A battery cell usually includes a shell and an end cap. A battery cell includes a shell and a battery cell, and the shell includes an end cap and a shell. After the battery cell is loaded into the shell, the end cap is used for packaging to maintain the sealing and reliability of the shell structure.

[0003] The end cap includes a first surface and a second surface that are arranged opposite to each other, and a side surface connecting the first surface and the second surface; due to the production process of the end cap (for example, stamping), the side surface of the end cap is a cutting surface. The end cap is welded to the shell, and the second surface of the end cap contacts the end surface of the shell. The side surface of the end cap is exposed to the outside, that is, the cutting surface of the end cap is exposed to the outside. The cutting surface of the end cap is easily a major entry point for rust and corrosion, affecting the performance of the battery. Utility Model Content

[0004] The present application provides a battery cell, a battery device, and an electrical device to improve the rust resistance of the outer shell structure, which is beneficial to improving the performance of the battery cell.

[0005] In order to solve the above-mentioned technical problems, the first aspect of the present application provides a battery cell, including a shell and an end cover; the shell includes a first side wall; the first side wall is an annular structure; the end cover is covered at one end of the shell; the edge of the end cover is bent toward the direction close to the first side wall to form a second side wall; wherein the end surface of the second side wall close to the first side wall is adhered to and fixedly connected with the end surface of the first side wall close to the end cover.

[0006] By arranging the end surface of the second side wall close to the first side wall to fit and fixedly connect with the end surface of the first side wall close to the end cover, the cut surface of the end cover is fit and fixedly connected with the end surface of the first side wall close to the end cover, thereby reducing the exposure of the cut surface of the end cover to the outside, thereby reducing the cut surface of the end cover from becoming a cutting point for rust and corrosion, which is beneficial to improving the rust resistance of the outer shell structure formed by the end cover and the shell.

[0007] In one embodiment, the outer corner of the bending point where the edge of the end cover is bent toward the first side wall is in an arc shape.

[0008] By setting the outer corner of the bending part where the edge of the end cover is bent toward the direction close to the first side wall to be arc-shaped, the outer surface of the bending part has a smooth transition, that is, the outer surface of the connection between the second side wall and the main body has a smooth transition, and the material film layer structure of the outer surface of the bending part of the end cover will not be damaged during the bending process. The outer surface of the bending part of the end cover maintains the anti-rust function of the material of the end cover itself, and the bending part basically does not form a main entry point for rust and corrosion, which is beneficial to improving the anti-rust performance of the outer shell structure formed by the end cover and the shell.

[0009] In one embodiment, an outer edge of an end surface of the first side wall close to the end cover is aligned with an outer edge of an end surface of the second side wall close to the first side wall.

[0010] By aligning the outer edge of the end face of the first side wall close to the end cover with the outer edge of the end face of the second side wall close to the first side wall, the outer surface of the connection between the first side wall and the second side wall is smooth, and basically no sharp area is formed, thereby reducing the outer edge of the connection between the first side wall and the second side wall from becoming an invasion point for rust and corrosion, which is beneficial to improving the rust resistance of the outer shell structure formed by the end cover and the shell.

[0011] In one embodiment, the outer surface of the second side wall and the outer surface of the first side wall smoothly transition at a connection seam between the second side wall and the first side wall.

[0012] By arranging a smooth transition between the outer surface of the second side wall and the outer surface of the first side wall at the connecting seam between the second side wall and the first side wall, basically no sharp area is formed, which is beneficial to improving the rust resistance of the outer shell structure formed by the end cover and the shell.

[0013] In one embodiment, an outer surface of an end portion of the second side wall close to the first side wall is flush with an outer surface of an end portion of the first side wall close to the second side wall.

[0014] By setting the outer surface of the end of the second side wall close to the first side wall to be flush with the outer surface of the end of the first side wall close to the second side wall, the connection between the first side wall and the second side wall and the outer surface in the vicinity thereof are smooth, and basically no sharp area is formed, thereby reducing the connection between the first side wall and the second side wall from becoming an invasion point for rust and corrosion, which is beneficial to improving the rust resistance of the outer shell structure formed by the end cover and the shell.

[0015] In one embodiment, the outer surface of the second side wall is flush with the outer surface of the first side wall.

[0016] By setting the outer surface of the second side wall to be flush with the outer surface of the first side wall, the connection between the first side wall and the second side wall is smoothly transitioned, and basically no sharp area is formed, which is conducive to improving the rust resistance of the shell structure formed by the end cover and the shell. In addition, by setting the outer surface of the second side wall to be flush with the outer surface of the first side wall, the size of the end cover is related to the size of the first side wall, and is less affected by other factors, so that the size consistency of the battery cell is good.

[0017] In one embodiment, an end surface of the first side wall close to the end cover completely overlaps with an end surface of the second side wall close to the first side wall.

[0018] By arranging that the end surface of the first side wall close to the end cover and the end surface of the second side wall close to the first side wall are completely overlapped, the contact area between the end surface of the first side wall close to the end cover and the end surface of the second side wall close to the first side wall is greatly increased, the force transmission is more uniform and effective, and it can withstand greater loads such as tension, pressure and shear force, thereby maintaining the connection between the first side wall and the second side wall with high strength and stability.

[0019] In one embodiment, an end surface of the second side wall close to the first side wall is welded to an end surface of the first side wall close to the end cover.

[0020] By arranging welding between the second side wall and the first side wall, the stability and high connection strength of the connection between the second side wall and the first side wall are maintained. By arranging welding between the end surface of the second side wall close to the first side wall and the end surface of the first side wall close to the end cover, the weld is smooth and the shape of the weld is easy to control, which is conducive to improving the sealing and rust resistance of the welding area.

[0021] In one embodiment, the battery cell further comprises a cell assembly, which is disposed in the shell; along the axial direction of the battery cell, the end surface of the cell assembly close to the end cover is located on the side of the connection seam between the second side wall and the first side wall away from the end cover.

[0022] By arranging the end face of the battery cell assembly close to the end cover along the axial direction of the battery cell to be located on the side of the connecting seam between the second side wall and the first side wall away from the end cover, the influence of high temperature during welding between the second side wall and the first side wall on the battery cell assembly can be reduced, and the battery cell assembly can be kept with good performance while achieving a fixed connection between the second side wall and the first side wall.

[0023] In one embodiment, along the axial direction of the battery cell, the distance between the end surface of the battery cell assembly close to the end cover and the connection seam is 0.5 mm-1 mm.

[0024] By setting the distance between the end surface of the battery cell assembly close to the end cover and the connecting seam as described above, the influence of high temperature on the battery cell assembly during welding between the second side wall and the first side wall can be significantly reduced, thereby maintaining good performance of the battery cell assembly.

[0025] In one embodiment, the entire circumferential edge of the end cover is bent toward the first side wall to form a second side wall, and the second side wall is an annular structure.

[0026] By setting the entire circumferential edge of the end cover to be bent in the direction close to the first side wall to form the second side wall, the exposure of the entire circumferential cutting surface of the end cover is reduced, and the entire circumferential cutting surface of the end cover is attached to and fixedly connected with the end surface of the first side wall close to the end cover, which reduces the right-angle structure of the edge of the cutting surface of the end cover from becoming a cutting point for rust and corrosion, which is beneficial to improving the rust resistance of the outer shell structure formed by the end cover and the shell.

[0027] In one embodiment, it further includes an anti-rust protective layer, which is disposed on the outer surfaces of the first side wall and the second side wall and covers the connection seam between the second side wall and the first side wall.

[0028] By providing an anti-rust protective layer, the anti-rust protective layer covers the connecting seam between the second side wall and the first side wall, further reducing the connecting seam between the second side wall and the first side wall from becoming an entry point for rust and corrosion, so that the battery cell has better anti-rust performance.

[0029] In a second aspect of the present application, a battery device is provided, the battery device comprising a box and a plurality of battery cells, the plurality of battery cells are contained in the box, and the battery cells are any of the battery cells described above. The battery device has at least the same advantages as the battery cells.

[0030] The third aspect of the present application provides an electric device, which includes the above-mentioned battery device. The electric device has at least the same advantages as the battery device.

[0031] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 It is a schematic diagram of a partial connection between a shell and an end cover in the related art;

[0034] Figure 2 is a schematic diagram of the structure of a battery cell provided in an embodiment of the present application;

[0035] Figure 3 yes Figure 2 A schematic diagram of the cross-sectional structure of a battery cell shown;

[0036] Figure 4 yes Figure 3 A schematic diagram of the enlarged structure of region B is shown;

[0037] Figure 5 It is a schematic diagram of a connection structure between the second side wall and the first side wall in another embodiment provided in an embodiment of the present application;

[0038] Figure 6 It is a schematic diagram of a connection structure between the second side wall and the first side wall according to another embodiment of the present application;

[0039] Figure 7 is a schematic diagram of a top view of the structure of an end cap before being bent according to another embodiment of the present application;

[0040] Figure 8 yes Figure 3 A schematic structural diagram of an end cover of a battery cell shown;

[0041] Fig. 9 is a schematic diagram of the structure of a battery device provided in an embodiment of the present application;

[0042] Fig.10 It is a schematic diagram of the structure of the electrical equipment provided in the embodiment of the present application.

[0043] Description of labels:

[0044] End cover A, shell B, first surface a, second surface b, side c, battery cell 1, shell 11, first side wall 111, end wall 112, end cover 12, second side wall 121, body 122, central part 12a, edge part 12b, explosion-proof valve 123, supporting connection part 124, first channel 125, exhaust groove 126, battery cell assembly 13, anti-rust protective layer 14, connecting seam M, box body 2, cover plate 201, hollow structure 202, battery device 100, equipment body 200, electrical equipment 1000. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and effect of the present application clearer and more specific, the following will describe the embodiments of the technical solution of the present application in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0047] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), similarly, "multiple groups" refers to more than two (including two groups), and "multiple pieces" refers to more than two (including two pieces), unless otherwise clearly and specifically defined.

[0048] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0049] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0050] Amounts, ratios and other numerical values ​​are presented herein in a range format. It should be understood that such a range format is for convenience and brevity and should be flexibly interpreted to include not only the values ​​explicitly specified as range limits, but also all individual values ​​or sub-ranges encompassed within the range, as if each value and sub-range were explicitly specified.

[0051] At present, cylindrical batteries are a commonly used battery. The outer shell of cylindrical batteries is mainly nickel-plated steel shell and polymer. Cylindrical batteries usually include a shell and an end cover, which form the outer shell of the cylindrical battery. Cylindrical batteries also include battery cells. After the battery cells are installed in the shell, they are encapsulated with end covers to maintain the sealing and reliability of the shell structure.

[0052] In one embodiment, the shell and the end cap are connected by welding (for example, laser welding); specifically, the shell and the end cap are welded after being spliced ​​(for example, Figure 1 As stated, Figure 1is a schematic diagram of a partial connection between a shell and an end cover in the related art). The end cover A includes a first surface a and a second surface b that are arranged opposite to each other, and a side surface c connecting the first surface a and the second surface b; due to the production process of the end cover A (for example, stamping), the side surface c is a cutting surface, the connection between the first surface a and the side surface c is a right angle, and the connection between the second surface b and the side surface c is a right angle; the end cover A is spliced ​​to the end of the shell B, the second surface b of the end cover A contacts the end surface of the shell B, and the side surface c of the end cover A is flush with the outer surface of the shell B.

[0053] During the welding process of the end cover A and the shell B, the side surface c of the end cover A is exposed to the outside, that is, the cut surface of the end cover A is exposed to the outside, and the cut surface of the end cover A easily becomes a major entry point for rust and corrosion.

[0054] Regarding the problem that the cut surface of the end cap A easily becomes an entry point for rust and corrosion, the related technology covers the cut surface of the end cap A while covering the connecting seam between the end cap A and the shell B with ultraviolet light curing glue (UV glue).

[0055] However, during the welding process of the end cap A and the shell B, the right angle at the connection between the second surface b and the side c may be melted off. However, due to insufficient welding width, the right angle at the connection between the first surface a and the side c may not be completely melted off during the welding process, and a sharp area may be formed. When the connection seam between the end cap A and the shell B and the side c of the end cap A are treated with ultraviolet light curing glue (UV glue), the sharp area at the connection between the first surface a and the side c is exposed due to the effect of surface tension after the glue is applied, and the ultraviolet light curing glue cannot cover the sharp area at the connection between the first surface a and the side c well, so that the sharp area is exposed, which is easy to become the main entry point for rust and corrosion, affecting the performance of the battery.

[0056] In view of this, the embodiments of the present application provide a battery cell, a battery device, and an electrical device to improve the rust resistance of the outer shell structure, which is beneficial to improving the performance of the battery cell.

[0057] See also Figures 2 to 6 , Figure 2 is a schematic diagram of the structure of a battery cell provided in an embodiment of the present application, Figure 3 yes Figure 2 The schematic diagram of the cross-sectional structure of the battery cell shown in FIG. Figure 4 yes Figure 3 The enlarged structural diagram of area B is shown. Figure 5 is a schematic diagram of another embodiment of the connection structure between the second side wall and the first side wall provided in an embodiment of the present application, Figure 6 It is a schematic diagram of a connection structure between the second side wall and the first side wall according to another embodiment of the present application.

[0058] The battery cell 1 includes a shell 11 and an end cover 12. The shell 11 includes a first side wall 111, and the first side wall 111 is a ring-shaped structure. The end cover 12 is covered at one end of the shell 11. The edge of the end cover 12 is bent toward the direction close to the first side wall 111 to form a second side wall 121. The end surface of the second side wall 121 close to the first side wall 111 is attached to and fixedly connected with the end surface of the first side wall 111 close to the end cover 12.

[0059] The housing 11 is arranged to form a receiving space, and the housing 11 can provide mechanical support and physical protection for various components received inside the housing 11. By setting the first side wall 111 as an annular structure, the first side wall 111 is arranged to form a receiving space, so that the housing 11 has a receiving space.

[0060] The end cap 12 is disposed at one end of the housing 11 to seal the end of the housing 11. The end cap 12 can position and fix various components inside the housing 11 to reduce the shaking or movement of each component in the housing 11. The end cap 12 can also be used to connect external circuits and provide specific functional interfaces.

[0061] The edge of the end cap 12 is bent toward the direction close to the first side wall 111, which can also be understood as: the end cap 12 includes a body 122 and a second side wall 121 connected to the body 122, the second side wall 121 is bent relative to the body 122 toward the direction close to the first side wall 111, and the connection between the second side wall 121 and the body 122 is the bending point where the edge of the end cap 12 is bent toward the direction close to the first side wall 111; the end cap 12 is an integrally formed structure, the body 122 and the second side wall 121 formed by processing are a complete and indivisible integral structure, and the body 122 and the second side wall 121 do not need to be fixed by welding, clamping, etc. It should be noted that the end cap 12 is a flat plate structure before being bent; the end cap 12 before being bent includes a first surface and a second surface arranged opposite to each other, and a side surface connecting the first surface and the second surface, the side surface is a cutting surface during the processing and production of the end cap 12, and after being bent, the cutting surface is the end surface of the second side wall 121 close to the first side wall 111.

[0062] By arranging the end surface of the second side wall 121 close to the first side wall 111 to fit and be fixedly connected with the end surface of the first side wall 111 close to the end cover 12, the cut surface of the end cover 12 is fit and fixedly connected with the end surface of the first side wall 111 close to the end cover 12, thereby reducing the exposure of the cut surface of the end cover 12 to the outside, thereby reducing the cut surface of the end cover 12 from becoming a cutting point for rust and corrosion, which is beneficial to improving the rust resistance of the outer shell structure formed by the end cover 12 and the shell 11.

[0063] In addition, by setting the edge of the end cover 12 to bend in the direction close to the first side wall 111 to form the second side wall 121, the material film structure at the bending part of the end cover 12 will not be damaged during the bending process. The bending part of the end cover 12 maintains the anti-rust function of the material of the end cover 12 itself, and the bending part basically does not form a major entry point for rust and corrosion, which is beneficial to improving the anti-rust performance of the outer shell structure formed by the end cover 12 and the shell 11.

[0064] In one embodiment, the outer corner of the bend where the edge of the end cover 12 is bent toward the first side wall 111 is in an arc shape (eg Figure 4 as shown).

[0065] The outer angle of a bend refers to the angle of the exposed outside of the bend. In other words, the outer angle of a bend is the angle of the outer surface of the bend.

[0066] By setting the outer corner of the bending part where the edge of the end cover 12 is bent toward the direction close to the first side wall 111 to be arc-shaped, the outer surface of the bending part has a smooth transition, that is, the outer surface of the connection between the second side wall 121 and the main body 122 has a smooth transition, and the material film structure of the outer surface of the bending part of the end cover 12 will not be damaged during the bending process. The outer surface of the bending part of the end cover 12 maintains the rust-proof function of the material of the end cover 12 itself, and the bending part basically does not form a main entry point for rust and corrosion, which is beneficial to improving the rust-proof performance of the outer shell structure formed by the end cover 12 and the shell 11.

[0067] In one embodiment, the outer edge of the end surface of the first side wall 111 close to the end cover 12 is aligned with the outer edge of the end surface of the second side wall 121 close to the first side wall 111 (eg, Figure 4 , Figure 5 , Figure 6 as shown).

[0068] The outer edge of the end surface of the first side wall 111 close to the end cover 12 refers to the edge of the accommodation space formed by the end surface of the first side wall 111 close to the end cover 12 away from the first side wall 111. The outer edge of the end surface of the second side wall 121 close to the first side wall 111 refers to the edge of the accommodation space formed by the end surface of the second side wall 121 close to the first side wall 111 away from the first side wall.

[0069] By aligning the outer edge of the end face of the first side wall 111 close to the end cover 12 with the outer edge of the end face of the second side wall 121 close to the first side wall 111, the area of ​​the cut surface of the end cover 12 exposed outside the outer shell structure formed by the end cover 12 and the shell 11 is reduced, and the outer edge of the connection between the first side wall 111 and the second side wall 121 is reduced from becoming an invasion point for rust and corrosion, which is beneficial to improving the rust resistance of the outer shell structure formed by the end cover 12 and the shell 11.

[0070] In one embodiment, the outer surface of the second side wall 121 and the outer surface of the first side wall 111 are smoothly transitioned at a connection seam M between the second side wall 121 and the first side wall 111 .

[0071] The smooth transition at the connecting seam M between the second side wall 121 and the first side wall 111 means that the connection from the second side wall 121 to the first side wall 111 is smooth without obvious edges, protrusions, steps or other unevenness.

[0072] By arranging a smooth transition between the outer surface of the second side wall 121 and the outer surface of the first side wall 111 at the connecting seam M between the second side wall 121 and the first side wall 111, the area of ​​the cut surface of the end cover 12 exposed outside the outer shell structure formed by the end cover 12 and the shell 11 is reduced, and basically no sharp area is formed, which is beneficial to improving the rust resistance of the outer shell structure formed by the end cover 12 and the shell 11.

[0073] In one embodiment, the outer surface of the end of the second side wall 121 close to the first side wall 111 is flush with the outer surface of the end of the first side wall 111 close to the second side wall 121 (eg, Figure 4 , Figure 6 as shown).

[0074] By setting the outer surface of the end of the second side wall 121 close to the first side wall 111 to be flush with the outer surface of the end of the first side wall 111 close to the second side wall 121, the outer surface of the connection between the first side wall 111 and the second side wall 121 and its vicinity is smooth, reducing the area of ​​the cut surface of the end cover 12 exposed outside the outer shell structure formed by the end cover 12 and the shell 11, basically no sharp area is formed, and the connection between the first side wall 111 and the second side wall 121 is reduced from becoming an invasion point for rust and corrosion, which is beneficial to improving the rust resistance of the outer shell structure formed by the end cover 12 and the shell 11.

[0075] In one embodiment, the outer surface of the second side wall 121 is flush with the outer surface of the first side wall 111 (eg Figure 4 as shown).

[0076] By setting the outer surface of the second side wall 121 flush with the outer surface of the first side wall 111, the area of ​​the cut surface of the end cap 12 exposed outside the outer shell structure formed by the end cap 12 and the shell 11 is reduced, and the connection between the first side wall 111 and the second side wall 121 is a smooth transition, and basically no sharp area is formed, which is conducive to improving the rust resistance of the outer shell structure formed by the end cap 12 and the shell 11. In addition, by setting the outer surface of the second side wall 121 flush with the outer surface of the first side wall 111, the size of the end cap 12 is related to the size of the first side wall 111, and is less affected by other factors, so that the size consistency of the battery cell 1 is good.

[0077] In one embodiment, the end surface of the first side wall 111 close to the end cover 12 and the end surface of the second side wall 121 close to the first side wall 111 completely overlap (eg, Figure 4 , Figure 5 , Figure 6 as shown).

[0078] The end surface of the first side wall 111 close to the end cover 12 and the end surface of the second side wall 121 close to the first side wall 111 completely overlap, which means that the outer edge of the end surface of the first side wall 111 close to the end cover 12 is aligned with the outer edge of the end surface of the second side wall 121 close to the first side wall 111, and the inner edge of the end surface of the first side wall 111 close to the end cover 12 is aligned with the inner edge of the end surface of the second side wall 121 close to the first side wall 111. Optionally, the inner surface of the first side wall 111 is flush with the inner surface of the second side wall 121, and the outer surface of the first side wall 111 is flush with the outer surface of the second side wall 121.

[0079] By arranging that the end surface of the first side wall 111 close to the end cover 12 and the end surface of the second side wall 121 close to the first side wall 111 are completely overlapped, the area of ​​the cut surface of the end cover 12 exposed outside the shell structure formed by the end cover 12 and the shell 11 is reduced, and the contact area between the end surface of the first side wall 111 close to the end cover 12 and the end surface of the second side wall 121 close to the first side wall 111 is greatly increased, the force transmission is more uniform and effective, and it can withstand greater loads such as tension, pressure and shear force, so as to maintain the connection between the first side wall 111 and the second side wall 121 with high strength and stability.

[0080] In one embodiment, an end surface of the second side wall 121 close to the first side wall 111 is welded to an end surface of the first side wall 111 close to the end cover 12 .

[0081] By arranging welding between the second side wall 121 and the first side wall 111, the stability and high connection strength of the connection between the second side wall 121 and the first side wall 111 are maintained. By arranging welding between the end face of the second side wall 121 close to the first side wall 111 and the end face of the first side wall 111 close to the end cover 12, the weld is smooth and the weld shape is easy to control, which is conducive to improving the sealing and rust resistance of the welding area; at the same time, it can also solve the problem in the related art that the weld cannot cover the outer edge right-angle area of ​​the cutting surface of the top cover due to insufficient welding molten width, thereby reducing the problem that the sharp corners are exposed and cannot be completely covered due to the effect of surface tension after glue coating.

[0082] In one embodiment, see Figure 3 and Figure 4The battery cell 1 also includes a cell assembly 13, which is disposed in the shell 11; along the axial direction of the battery cell 1, the end surface of the cell assembly 13 close to the end cover 12 is located on the side of the connecting seam M between the second side wall 121 and the first side wall 111 away from the end cover 12.

[0083] The cell assembly 13 is a component in the battery cell 1 where electrochemical reactions occur. The cell assembly 13 may include a cell body and a positive electrode tab and a negative electrode tab. The cell assembly 13 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. As an example, the separator may be a diaphragm, and the material of the diaphragm may be PP (polypropylene) or PE (polyethylene), etc. As an example, the positive electrode sheet includes a positive electrode collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode collector, and the current collector not coated with the positive electrode active material layer serves as the positive electrode tab. As an example, the negative electrode sheet includes a negative electrode collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode collector, and the current collector not coated with the negative electrode active material layer serves as the negative electrode tab. As an example, the material of the positive electrode collector may be aluminum, and the positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc.; the material of the negative electrode collector may be copper, and the negative electrode active material may be carbon or silicon, etc.

[0084] The axial direction of the battery cell 1 is perpendicular to the direction of the end cover 12. By arranging the end surface of the battery cell assembly 13 close to the end cover 12 along the axial direction of the battery cell 1 to be located at the side of the connection seam M between the second side wall 121 and the first side wall 111 away from the end cover 12, the influence of high temperature on the battery cell assembly 13 during welding between the second side wall 121 and the first side wall 111 can be reduced, and the battery cell assembly 13 can be kept with good performance while achieving a fixed connection between the second side wall 121 and the first side wall 111.

[0085] In one embodiment, along the axial direction of the battery cell 1 , the distance between the end surface of the battery cell assembly 13 close to the end cover 12 and the connection seam M is 0.5 mm-1 mm.

[0086] By setting the distance between the end surface of the battery cell assembly 13 close to the end cover 12 and the connection seam M as described above, the influence of high temperature on the battery cell assembly 13 during welding between the second side wall 121 and the first side wall 111 can be significantly reduced, and the battery cell assembly 13 can be kept with good performance. The distance between the end surface of the battery cell assembly 13 close to the end cover 12 and the connection seam M can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc., or can be a range consisting of any two of the above values, for example, 0.5mm-0.8mm, 0.7mm-1mm, etc.

[0087] In one embodiment, if Figure 3 As shown, the entire circumferential edge of the end cover 12 is bent toward the direction close to the first side wall 111 to form a second side wall 121, and the second side wall 121 is an annular structure.

[0088] By setting the entire circumferential edge of the end cover 12 to bend in the direction close to the first side wall 111 to form the second side wall 121, the exposure of the entire circumferential cutting surface of the end cover 12 is reduced. The entire circumferential cutting surface of the end cover 12 is attached to and fixedly connected with the end surface of the first side wall 111 close to the end cover 12, which reduces the right-angle structure of the edge of the cutting surface of the end cover 12 from becoming a cutting point for rust and corrosion, which is beneficial to improving the rust resistance of the outer shell structure formed by the end cover 12 and the shell 11.

[0089] In one embodiment, see Figure 7 , Figure 7 It is a schematic diagram of the top view structure of another embodiment of the end cap provided in the embodiment of the present application before being bent, the end cap 12 includes a central portion 12a and an edge portion 12b connected to the central portion 12a, the contour of the central portion 12a is a regular pattern, the edge portion 12b of the end cap 12 is bent in a direction close to the first side wall 111 to form a second side wall 121 (that is, part of the edge of the end cap 12 is bent in a direction close to the first side wall 111 to form the second side wall 121), and adjacent second side walls 121 are arranged at intervals. It should be noted that the contour shape and size formed by the encirclement of the first side wall 111 are matched with the contour shape and size of the central portion 12a of the end cap 12, the surface of the first side wall 111 facing the end cap 12 is provided with a groove, the second side wall 121 is arranged in the groove, and the structural size of the groove is matched with the structural size of the second side wall 121.

[0090] By setting a portion of the edge of the end cover 12 to be bent in a direction close to the first side wall 111 to form the second side wall 121, a portion of the cut surface of the end cover 12 will not be exposed. To a certain extent, the right-angle structure of the edge of the portion of the cut surface of the end cover 12 is not easy to become a cutting point for rust and corrosion, thereby improving the rust resistance.

[0091] In one embodiment, if Figure 4 As shown, the battery cell 1 further includes an anti-rust protective layer 14 , which is disposed on the outer surfaces of the first side wall 111 and the second side wall 121 and covers the connection seam M between the second side wall 121 and the first side wall 111 .

[0092] By providing an anti-rust protective layer 14, the anti-rust protective layer 14 covers the connecting seam M between the second side wall 121 and the first side wall 111, and can well cover the right-angle structure of the outer edge of the cutting surface of the end cover 12, further reducing the connecting seam M between the second side wall 121 and the first side wall 111 from becoming a cutting point for rust and corrosion, so that the battery cell 1 has a better anti-rust performance.

[0093] Optionally, the anti-rust protective layer 14 includes ultraviolet light curing glue (UV glue).

[0094] UV glue is used to prevent rust, with a fast curing speed and good anti-rust effect. Free liquid UV glue is applied to the surface of the connection seam M between the second side wall 121 and the first side wall 111, and then the photoinitiator in the UV glue material is irradiated by ultraviolet rays, absorbs ultraviolet light, generates active free radicals, and initiates monomer polymerization, cross-linking and grafting chemical reactions, so that the adhesive in the UV glue is converted from liquid to solid within a few seconds, thereby forming a solid hard colloid protection for the connection seam M.

[0095] In a specific embodiment, the outer corner of the bending point where the edge of the end cover 12 is bent toward the first side wall 111 is arc-shaped, the outer surface of the second side wall 121 is flush with the outer surface of the first side wall, the end surface of the second side wall 121 close to the first side wall 111 is welded to the end surface of the first side wall 111 close to the end cover 12, and the outer surface of the connecting seam M between the second side wall 121 and the first side wall 111 is covered with UV glue.

[0096] By arranging a welding between the end surface of the second side wall 121 close to the first side wall 111 and the end surface of the first side wall 111 close to the end cover 12, the weld shape is easy to control, the weld is smooth, the influence of the weld size on the glue coating is reduced, and the UV glue keeps good coverage of the weld; the outer surface of the second side wall is flush with the outer surface of the first side wall 111, the outer surface of the second side wall 121 and the outer surface of the first side wall 111 serve as the coating surface of the UV glue, the coating surface of the UV glue is relatively smooth, the influence of the outer surface of the first side wall 111 and the outer surface of the second side wall 121 on the glue coating is reduced, and the UV glue keeps good coverage of the adjacent weld area, which is beneficial to improving the UV glue coating rate and significantly improving the rust prevention rate.

[0097] In one embodiment, if Figure 3 As shown, the shell 11 also includes an end wall 112 , the first side wall 111 is arranged around the entire edge of the end wall 112 , and the first side wall 111 and the end wall 112 are fixedly connected; the end wall 112 is arranged at one end of the first side wall 111 away from the end cover 12 .

[0098] Optionally, the end wall 112 and the first side wall 111 are integrally formed, that is, the end wall 112 and the first side wall 111 are formed simultaneously through one processing. The above arrangement is helpful to reduce the complexity of assembly.

[0099] In one embodiment, see Figure 8 , Figure 8 yes Figure 3 The schematic diagram of the structure of the end cover of the battery cell shown in the figure, the end cover 12 includes an explosion-proof valve 123, a support connection part 124, a first channel 125 and an exhaust groove 126. The explosion-proof valve 123 is a circular structure, which is arranged in the middle of the end cover 12; the main function of the explosion-proof valve 123 is that when the battery cell 1 is disturbed by external factors and the internal pressure is too large and there is a risk of explosion, the explosion-proof valve 123 will be ejected first to prevent the battery cell from exploding. The support connection part 124 is a circular ring structure, which is arranged around the explosion-proof valve 123; the support connection part 124 can improve the structural strength of the end cover 12, and at the same time serve as a channel for the electrode to conduct electricity with the outside world. Multiple first channels 125 and multiple exhaust grooves 126 are alternately arranged to form an annular structure, and are arranged around the support connection part 124. Multiple first channels 125 are the electrode current collecting area of ​​the battery cell assembly 13.

[0100] In one embodiment, the housing 11 may be in various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the housing 11 may be determined according to the specific shape and size of the battery cell assembly 13. Exemplarily, the shape of the housing 11 is cylindrical.

[0101] In one embodiment, the shell 11 can be made of various materials, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0102] In one embodiment, the shape and size of the second side wall 121 of the end cover 12 are matched with the shape and size of the first side wall 111 of the shell 11. Exemplarily, the shell 11 is cylindrical, and the second side wall 121 of the end cover 12 is a circular ring structure.

[0103] In one embodiment, the end cap 12 can be made of a variety of materials, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0104] See also Fig. 9 , Fig. 9 It is a schematic diagram of the structure of the battery device provided in the embodiment of the present application.

[0105] The battery device 100 includes a housing 2 and a plurality of battery cells 1 . The battery cells 1 are accommodated in the housing 2 .

[0106] The box 2 is used to provide a storage space for the battery cell 1, and can encapsulate the box 2 of one or more battery cells 1. The box 2 can adopt a variety of structures including but not limited to, for example, the box 2 can include a cover plate 201 and a hollow structure 202 with an open end, wherein the cover plate 201 covers the open side of the hollow structure 202 to jointly define the storage space. Of course, the box 2 can be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0107] The battery cell 1 is the battery cell 1 provided in the above embodiment. Please refer to the above embodiment for the specific structure, which will not be repeated here. There can be multiple battery cells 1, and the multiple battery cells 1 can be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple battery cells 1 are both connected in series and in parallel. Multiple battery cells 1 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 1 is accommodated in the box 2; of course, the battery device 100 can also be a battery device 100 module in which multiple battery cells 1 are first connected in series, in parallel, or in mixed connection, and multiple battery device 100 modules are then connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box 2. The battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar component for realizing electrical connection between multiple battery cells 1.

[0108] See also Fig.10 , Fig.10 It is a schematic diagram of the structure of the electrical equipment provided in the embodiment of the present application.

[0109] The electric device 1000 may include a device body 200 and a battery device 100, wherein the battery device 100 is disposed in the device body 200. The battery device 100 is used to supply power to the electric components of the device body 200 so that the device body 200 can work.

[0110] An electrical device may be an element that can consume electricity; for example, an electrical device may be a controller and an electronic component, etc. The controller may be a central processing unit (CPU), a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0111] The electrical equipment 1000 may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. Spacecraft include aircraft, rockets, space shuttles and spacecrafts, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc. For the convenience of description, the following embodiments are described by taking the electrical equipment 1000 as a vehicle as an example.

[0112] In some examples, the electric device 1000 may be a vehicle, the device body 200 may be a vehicle frame, and the battery device 100 is mounted on the vehicle frame. The electric device may be a lamp (e.g., headlight, taillight, etc.), a display screen, a dashboard, a control system (e.g., a controller), etc. of the vehicle. The electric device is mounted on the vehicle body.

[0113] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: The housing comprises a first side wall; the first side wall is an annular structure; An end cover is provided at one end of the shell; the edge of the end cover is bent toward the first side wall to form a second side wall; wherein the end surface of the second side wall close to the first side wall is adhered to and fixedly connected with the end surface of the first side wall close to the end cover.

2. The battery cell according to claim 1, characterized in that: The outer corner of the bending point where the edge of the end cover is bent toward the first side wall is in an arc shape.

3. The battery cell according to claim 1, characterized in that: An outer edge of an end surface of the first side wall close to the end cover is aligned with an outer edge of an end surface of the second side wall close to the first side wall.

4. The battery cell according to claim 3, characterized in that: The outer surface of the second side wall and the outer surface of the first side wall are smoothly transitioned at a connection seam between the second side wall and the first side wall.

5. The battery cell according to claim 4, characterized in that: An outer surface of an end portion of the second side wall close to the first side wall is flush with an outer surface of an end portion of the first side wall close to the second side wall.

6. The battery cell according to claim 5, characterized in that: An outer surface of the second side wall is flush with an outer surface of the first side wall.

7. The battery cell according to any one of claims 3 to 6, characterized in that: An end surface of the first side wall close to the end cover completely overlaps with an end surface of the second side wall close to the first side wall.

8. The battery cell according to claim 1, characterized in that: An end surface of the second side wall close to the first side wall is welded to an end surface of the first side wall close to the end cover.

9. The battery cell according to claim 8, characterized in that: The battery cell also includes a cell assembly, which is arranged in the shell; along the axial direction of the battery cell, the end surface of the cell assembly close to the end cover is located on the side of the connection seam between the second side wall and the first side wall away from the end cover.

10. The battery cell according to claim 9, characterized in that: Along the axial direction of the battery cell, the distance between the end surface of the battery cell assembly close to the end cover and the connecting seam is 0.5 mm-1 mm.

11. The battery cell according to claim 1, characterized in that: The entire circumferential edge of the end cover is bent toward the first side wall to form the second side wall, and the second side wall is an annular structure.

12. The battery cell according to claim 1, characterized in that: It also includes an anti-rust protective layer, which is arranged on the outer surfaces of the first side wall and the second side wall and covers the connecting seam between the second side wall and the first side wall.

13. A battery device, characterized in that: include: Box; A plurality of battery cells are housed in the box; the battery cells are the battery cells according to any one of claims 1-12.

14. An electrical device, characterized in that: A battery device comprising the battery device of claim 13.

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