Battery cell shell, battery cell and electric equipment

Abstract

The utility model provides a battery cell shell, battery cell and electric equipment, and relates to battery technical field, the battery cell shell includes shell body, weld seam and cover plate, said shell body is the shell structure of hollow interior and has the opening, said cover plate is provided in said opening of said shell body, said cover plate at least partially protrudes out of said shell body, said weld seam is located in said shell body, said weld seam is located in said shell body, said weld seam is located in said shell body. And welding the joint of the outer edge of the cover plate and the opening edge of the shell body to form the welding seam. According to the utility model, a welding seam formed after the welding operation of the cover plate and the shell body cannot protrude out of the outer surface of the cover plate, so that not only is the attractive appearance of the battery cell shell ensured, but also an outer film cannot be damaged when the outer film is packaged on the surface of a subsequent battery cell, the sealing property of the outer film is ensured, and the reject ratio of the battery cell is correspondingly reduced.

Description

Technical Field

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

[0002] Batteries, such as power batteries, mainly serve as power sources for various devices, such as electric vehicles. A cell mainly includes a cell housing, an electrolyte, a positive electrode plate and a negative electrode plate. Among them, the electrolyte is arranged in the cell housing, and the positive electrode plate and the negative electrode plate are arranged at intervals in the cell housing.

[0003] In the related art, the cell housing includes a housing body and a cover plate. The cover plate is embedded at the opening of the housing body. After the outer edge of the cover plate is welded to the opening edge of the housing body from above by a welding process, a weld seam will be formed at the connection between the cover plate and the housing body; since the cover plate is a flat plate structure and the outer edge of the cover plate is flush with the opening edge of the housing body, the weld seam will protrude from the cover plate, which will not only affect the appearance of the cell housing, but also damage the outer film when packaging the outer film on the surface of the cell subsequently, thereby affecting the sealing performance of the outer film and increasing the defective rate of the cell housing. Summary of the Utility Model

[0004] The problem to be solved by the utility model is how to provide a cell housing in which the weld seam does not protrude from the outer surface of the cover plate.

[0005] To solve the above problems, in a first aspect, the utility model provides a cell housing, including a housing body, a weld seam and a cover plate. The housing body is a hollow housing structure with an opening, the cover plate is arranged at the opening of the housing body, at least part of the cover plate protrudes from the housing body, and the weld seam is formed by welding the connection between the outer edge of the cover plate and the opening edge of the housing body.

[0006] Optionally, an avoidance notch is provided at the outer edge of the cover plate, and the thickness of the cover plate at the avoidance notch is less than the thickness of its adjacent part.

[0007] Optionally, the avoidance notch includes a first notch, and the first notch is formed at a part of the outer edge of the cover plate facing the inner side of the housing body. The first notch is a first outer chamfer structure formed by using an inclined chamfer process.

[0008] Optionally, the avoidance notch further includes a second notch, and the second notch is formed at a part of the outer edge of the cover plate facing the outer side of the housing body. At least part of the weld seam covers the second notch.

[0009] Optionally, the vertical cross-section of the second notch is at least one of a stepped structure, an L-shaped structure and an arc-shaped structure.

[0010] Optionally, the second notch is a second outer chamfer structure formed by an inclined chamfering process.

[0011] Optionally, the second notch is an annular groove.

[0012] Optionally, the end of the second notch close to the inner edge of the housing body is lower than, flush with, or higher than the opening edge of the housing body.

[0013] Optionally, the battery cell housing includes a cover plate, the housing body has an opening, and the cover plate is embedded at the opening;

[0014] Or, the battery cell housing includes two cover plates, the housing body has two oppositely arranged openings, and the two cover plates are respectively embedded at the corresponding two openings.

[0015] The beneficial effect of the battery cell housing of the present utility model is that: the housing body is a hollow housing structure with an opening, so that other components of the battery cell, such as electrolyte, positive electrode plate, and negative electrode plate, can be placed inside the housing body from the opening, and the cover plate is arranged at the opening of the housing body to encapsulate other components of the battery cell inside the housing body; subsequently, welding operations can be performed on the connection between the outer edge of the cover plate and the opening edge of the housing body by welding to form a weld seam at the connection between the two. Since at least a part of the cover plate protrudes from the housing body, in other words, the outer surface of the cover plate is higher than the end surface of the housing body on the same side as the cover plate, so that the weld seam formed after welding the cover plate and the housing body does not protrude from the outer surface of the cover plate, thus not only ensuring the beauty of the battery cell housing, but also not damaging the outer film when packaging the outer film on the surface of the battery cell subsequently, so as to ensure the sealing performance of the outer film and correspondingly reduce the defective rate of the battery cell housing.

[0016] In a second aspect, the present utility model provides a battery cell, including the battery cell housing as described above, and further including an electrolyte, a positive electrode plate, and a negative electrode plate. The electrolyte is arranged inside the housing body of the battery cell housing, and the positive electrode plate and the negative electrode plate are arranged at intervals inside the housing body.

[0017] Therefore, since the battery cell includes the battery cell housing, the battery cell at least has all the technical effects of the battery cell housing, which will not be elaborated here.

[0018] In a third aspect, the present utility model provides an electrical device, including the battery cell as described above, and further including a bracket, and the battery cell is installed on the bracket.

[0019] Therefore, since the electrical device includes the battery cell, the electrical device at least has all the technical effects of the battery cell, which will not be elaborated here. Description of the Drawings

[0020] Figure 1Explosion structure schematic diagram of the shell body and the cover plate in the prior art;

[0021] Figure 2 Cross-sectional structure schematic diagram of the shell body and the cover plate before welding in the prior art;

[0022] Figure 3 Cross-sectional structure schematic diagram of the shell body and the cover plate after welding in the prior art;

[0023] Figure 4 One of the cross-sectional structure schematic diagrams of the shell body and the cover plate before welding in the embodiment of the present invention;

[0024] Figure 5 One of the cross-sectional structure schematic diagrams of the shell body and the cover plate after welding in the embodiment of the present invention;

[0025] Figure 6 Another cross-sectional structure schematic diagram of the shell body and the cover plate before welding in the embodiment of the present invention;

[0026] Figure 7 Another cross-sectional structure schematic diagram of the shell body and the cover plate after welding in the embodiment of the present invention;

[0027] Figure 8 Another cross-sectional structure schematic diagram of the shell body and the cover plate before welding in the embodiment of the present invention;

[0028] Figure 9 Another cross-sectional structure schematic diagram of the shell body and the cover plate before welding in the embodiment of the present invention;

[0029] Figure 10 Another cross-sectional structure schematic diagram of the shell body and the cover plate before welding in the embodiment of the present invention;

[0030] Figure 11 Another cross-sectional structure schematic diagram of the shell body and the cover plate before welding in the embodiment of the present invention;

[0031] Figure 12 Another cross-sectional structure schematic diagram of the shell body and the cover plate before welding in the embodiment of the present invention;

[0032] Figure 13 Another cross-sectional structure schematic diagram of the shell body and the cover plate before welding in the embodiment of the present invention;

[0033] Figure 14 Another cross-sectional structure schematic diagram of the shell body and the cover plate after welding in the embodiment of the present invention;

[0034] Explanation of reference numerals:

[0035] 1'-Shell body; 11'-Opening; 2'-Cover plate; 3'-Weld seam;

[0036] 1-Shell body; 11-Opening; 2-Cover plate; 21-Avoidance notch; 211-First notch; 212-Second notch; 3-Weld seam. Detailed implementation mode

[0037] To make the above-mentioned objects, features and advantages of the present utility model more obvious and understandable, the following will describe in detail the specific embodiments of the present utility model with reference to the accompanying drawings. Although some embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model can be implemented in various forms and should not be construed as limited to the embodiments described herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present utility model. It should be understood that the drawings and embodiments of the present utility model are only for exemplary purposes and are not used to limit the protection scope of the present utility model.

[0038] In the accompanying drawings, the Z-axis represents the vertical direction, that is, the up and down position, and the positive direction of the Z-axis represents the upper side, and the negative direction of the Z-axis represents the lower side; the X-axis in the accompanying drawings represents the horizontal direction and is designated as the left and right position, and the positive direction of the X-axis represents the right side, and the negative direction of the X-axis represents the left side; the Y-axis in the accompanying drawings represents the front and back position, and the positive direction of the Y-axis represents the front side, and the negative direction of the Y-axis represents the back side. At the same time, it should be noted that the above-mentioned meanings represented by the Z-axis, Y-axis and X-axis are only for facilitating the description of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0039] The term "including" and its variants used herein are open-ended, that is, "including but not limited to"; the term "based on" is "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiment". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts such as "first" and "second" mentioned in the present utility model are only used to distinguish different devices, modules or units, and are not used to limit the order or mutual dependence relationship of the functions performed by these devices, modules or units.

[0040] It should be noted that the modifications of "one" and "multiple" mentioned in the present utility model are illustrative rather than restrictive. Those skilled in the art should understand that unless otherwise clearly stated in the context, it should be understood as "one or more".

[0041] In the related art, a battery, such as a power battery, mainly serves as a power source for various devices, such as an electric vehicle. A battery cell mainly includes a cell housing, an electrolyte, a positive electrode plate, and a negative electrode plate. Among them, the electrolyte is disposed inside the cell housing, and the positive electrode plate and the negative electrode plate are spaced apart inside the cell housing.

[0042] Figure 1 FIG. 4 is an axonometric structural schematic diagram of an explosion between a housing body of a cell housing and a cover plate in the prior art. Figure 2 FIG. 6 is a sectional structural schematic diagram of a cover plate covering an opening of a housing body in a plane where a coordinate system XZ is located along the welding front in the prior art. Figure 3 FIG. 8 is a sectional structural schematic diagram of a cover plate covering an opening of a housing body in a plane where a coordinate system XZ is located along the welding rear in the prior art.

[0043] Among them, as shown in Figures 1 to 3 FIG. 13, the cell housing includes a housing body 1' and a cover plate 2'. The cover plate 2' is embedded at an opening 11' of the housing body 1'. After the outer edge of the cover plate 2' is welded to the inner edge of the housing body 1' from above the cover plate 2' through a welding process, a weld seam 3' will be formed at the connection between the cover plate 2' and the housing body 1'; due to the cover plate 2' being a flat plate structure and the outer edge of the cover plate 2' being flush with the surface of the housing body 1', for example, Figure 2 the top surface of the cover plate 2' in FIG. 15 is flush with the top of the housing body 1', making the weld seam 3' protrude from the cover plate 2' (as shown in Figure 3 FIG. 17). Thus, it will not only affect the aesthetics of the cell housing, but also damage the outer film when packaging the outer film on the surface of the cell subsequently, further affecting the sealing performance of the outer film and increasing the defective rate of the cell.

[0044] Among them, the outer film for packaging on the surface of the cell can be a PE film. The PE film is used to prevent the cell from contacting the external environment, reducing the erosion and pollution of the cell by external substances; at the same time, the PE film can provide a certain fire prevention and barrier function, reducing the risk of fire occurrence in the cell. The PE film has other functions, such as the isolation function for the positive and negative electrodes of the cell. That is, packaging the outer film, such as a PE film, on the outer surface of the cell is the prior art and will not be elaborated here. In addition, if the weld seam 3' in the cell housing after processing protrudes from the outer surface of the cover plate 2', it can be determined that the cell is a defective product, thus increasing the defective rate of the cell.

[0045] Aiming at the problems existing in the above-mentioned related art, this embodiment provides a cell housing.

[0046] Figure 4 FIG. 27 is a sectional structural schematic diagram of a cover plate embedded in an opening of a housing body without welding in an embodiment of the present invention. Figure 5 FIG. 29 is a sectional structural schematic diagram of a cover plate embedded in an opening of a housing body and after welding operation in an embodiment of the present invention.

[0047] As Figure 4 and Figure 5 shown, a cell housing provided by an embodiment of the present utility model includes a housing body 1, a weld seam 3, and a cover plate 2. The housing body 1 is a hollow housing structure with an opening 11. The cover plate 2 is disposed at the opening 11 of the housing body 1, and at least a part of the cover plate 2 protrudes from the housing body 1. The weld seam 3 is formed by welding the connection between the outer edge of the cover plate 2 and the opening edge of the housing body 1.

[0048] Specifically, the housing body 1 can be set to different shapes according to factors such as the use environment and function of the cell. For example, it can be set as a cuboid housing structure. The internal hollow of the housing body 1 means that the housing body 1 has a cavity, and an opening 11 is preset on the housing body 1 to facilitate other components of the cell to be arranged in the cavity of the housing body 1 from the opening 11. Subsequently, the cover plate 2 can be embedded in the opening 11.

[0049] The cover plate 2 can be a flat plate-like structure. The dimensions of the cover plate 2, for example, the dimensions along the X-axis and Y-axis in the coordinate system, match the dimensions of the opening 11 of the housing body 1, or are slightly smaller than the dimensions of the opening 11 to ensure that the cover plate 2 can be disposed at the opening 11.

[0050] The weld seam 3 can be an annular structure distributed around the outer circumference of the cover plate 2.

[0051] The "disposed" in the statement that the cover plate 2 is disposed at the opening 11 of the housing body 1 means that during the welding operation, the bottom of the cover plate 2 can be higher than or flush with the opening edge of the housing body 1, or at least a part of the cover plate 2 is embedded in the opening edge of the housing body 1.

[0052] In this embodiment, the housing body 1 is a hollow housing structure with an opening 11 to facilitate other components of the cell, such as electrolyte, positive electrode plate, and negative electrode plate, to be placed inside the housing body 1 from the opening 11. The cover plate 2 is embedded in the opening 11 of the housing body 1 to encapsulate other components of the cell inside the housing body 1. Subsequently, the connection between the outer edge of the cover plate 2 and the opening edge of the housing body 1 can be welded, for example, by laser welding, to form a weld seam 3 at the connection. Since at least a part of the cover plate 2 protrudes from the housing body 1, in other words, the outer surface of the cover plate 2 is higher than the end surface of the housing body 1 on the same side as the cover plate 2, so that the weld seam 3 formed after welding the cover plate 2 and the housing body 1 does not protrude from the outer surface of the cover plate 2, which not only ensures the beauty of the cell housing, but also does not damage the outer film during the subsequent surface packaging outer film of the cell, so as to ensure the sealing performance of the outer film and correspondingly reduce the defective rate of the cell housing.

[0053] Optionally, in combination with Figure 6 andFigure 7 As shown, an avoidance notch 21 is provided at the outer edge of the cover plate 2, and the thickness of the cover plate 2 at the avoidance notch 21 is less than the thickness of its adjacent part.

[0054] Specifically, an avoidance notch 21 is formed at the outer edge of the cover plate 2. It can be understood that the thickness of the cover plate 2 at the avoidance notch 21 part of the outer edge is less than the thickness of the adjacent part of the avoidance notch 21. Among them, the thickness of the cover plate 2 refers to the dimension between the surface of the cover plate 2 facing the inner side of the housing body 1 (i.e., the inner side wall of the cover plate 2) and the surface of the cover plate 2 facing away from the inner side of the housing body 1 (i.e., the outer side wall of the cover plate 2).

[0055] Take Figure 6 the example that the battery cell housing is placed vertically during installation. The opening 11 can be formed at the top of the housing body 1, and the cover plate 2 is embedded in the opening 11. At this time, the cover plate 2 is equivalent to the top plate of the battery cell housing.

[0056] In this optional embodiment, by forming an avoidance notch 21 at the outer edge of the cover plate 2, when welding is performed between the avoidance notch 21 at the outer edge of the cover plate 2 and the opening edge of the housing body 1 to form a weld seam 3, the avoidance notch 21 not only provides an avoidance space for the welding operation, but also the high temperature generated during the welding operation can melt the cover plate 2 at the avoidance notch 21, further making the weld seam 3 formed by the welding operation lower than the outer surface of the cover plate 2 (see Figure 7 shown), and will not protrude from the outer surface of the cover plate 2, so as to ensure the beauty of the battery cell housing and correspondingly improve the yield rate of the battery cell housing.

[0057] Optionally, as combined with Figure 4 shown, the avoidance notch 21 includes a first notch 211. The first notch 211 is formed at the part of the outer edge of the cover plate 2 facing the inner side of the housing body 1, and the first notch 211 is a first outer chamfer structure formed by using an inclined chamfer process.

[0058] Specifically, the part of the outer edge of the cover plate 2 facing the inner side of the housing body 1 refers to the inner side wall of the outer edge of the cover plate 2. Therefore, the first notch 211 is formed at the inner side wall of the outer edge of the cover plate 2.

[0059] If the opening is formed at the top end of the housing body, the cross-section of the first notch 211 in the horizontal direction can be an annular structure.

[0060] In this optional embodiment, when the cover plate 2 is embedded in the opening 11 of the housing body 1, a first notch 211 is formed at a position on the outer edge of the cover plate 2 facing the inner side of the housing body 1. The first notch 211 not only provides a clearance space during the process of embedding the cover plate 2 at the opening end 11 of the housing body 1, so as to improve the smoothness of embedding the cover plate 2 in the opening 11 of the housing body 1, but also when welding is performed at the connection between the outer edge of the cover plate 2 and the inner edge of the opening 11 of the housing body 1, since the thickness of the cover plate 2 at the first notch 211 is lower than other parts of the cover plate 2, it helps the high temperature generated by the welding operation to quickly melt the first notch 211 and the inner edge of the housing body 1, so that part of the weld seam 3 will cover the first notch 211, thereby improving the welding firmness between the cover plate 2 and the housing body 1.

[0061] The inner side of the outer edge of the cover plate 2 can be processed by an inclined chamfering process to form a first outer chamfer structure, and the first outer chamfer structure is the first notch 211.

[0062] Among them, the first outer chamfer structure is an inclined plane relative to the inner side wall of the cover plate 2.

[0063] Optionally, the clearance notch 21 further includes a second notch 212. The second notch 212 is formed at a position on the outer edge of the cover plate 2 facing the outside of the housing body 1, and at least part of the weld seam 3 covers the second notch 212.

[0064] Specifically, taking the housing body 1 as a reference object, the position on the outer edge of the cover plate 2 facing the outside of the housing body 1 refers to the outer side wall of the outer edge of the cover plate 2. That at least part of the weld seam 3 covers the second notch 212 means that the weld seam 3 can only cover part of the second notch 212, that is, the circumferential width of the weld seam 3 is less than the width of the second notch 212, or the weld seam 3 can cover the entire second notch 212. At this time, the size of the weld seam 3 is the same as or basically the same as the size of the second notch 212.

[0065] If the opening is formed at the top end of the housing body, the cross-section of the second notch 212 in the horizontal direction can be an annular structure.

[0066] In this embodiment, as shown in Figure 12 the clearance notch 21 may only include the second notch 212. In other words, only the second notch 212 is formed on the outer side wall of the outer edge of the cover plate 2, and the first notch 211 is not formed on the inner side wall of the outer edge of the cover plate 2.

[0067] In an optional embodiment, a second groove 212 is opened on the outer side wall of the outer edge of the cover plate 2 so that when welding is performed at the connection between the second groove 212 on the outer edge of the cover plate 2 and the inner edge of the shell body 1, more solder can be accommodated at the second groove 212 to form a wider weld 3, thereby correspondingly increasing the connection strength between the cover plate 2 and the shell body 1.

[0068] Or, combined Figures 6 to 11 ,as well as Figure 13 As shown, the avoidance opening 11 includes a first slot 211 and a second slot 212 . In other words, not only the first slot 211 is formed on the inner wall of the outer edge of the cover plate 2 , but also the second slot 212 is formed on the outer wall of the outer edge of the cover plate 2 .

[0069] In an optional embodiment, a second slot 212 is provided on the outer side wall of the outer edge of the cover plate 2, so that when welding is performed at the connection between the second slot 212 on the outer edge of the cover plate 2 and the inner edge of the shell body 1, more solder can be accommodated at the second slot 212 to form a wider weld 3, thereby correspondingly increasing the connection strength between the cover plate 2 and the shell body 1; and a first slot 211 is provided on the inner side wall of the outer edge of the cover plate 2, so that the first slot 211 not only provides an escape space and guidance for the cover plate 2 in the process of being embedded in the opening 11 end of the shell body 1, thereby improving the smoothness of the cover plate 2 being embedded in the opening 11 of the shell body 1, but also because the thickness of the cover plate 2 at the first slot 211 is lower than that of other parts of the cover plate 2, it will help the high temperature generated by the welding operation to quickly melt the first slot 211 and the inner edge of the shell body 1, so that part of the weld 3 will cover the first slot 211, thereby further improving the welding firmness of the cover plate 2 and the shell body 1.

[0070] Optionally, combined Figures 8 to 11 As shown, the vertical cross-section of the second slot 212 is at least one of a step-shaped structure, an L-shaped structure, and an arc-shaped structure.

[0071] Specifically, the vertical cross section of the second slot 212 refers to: Figures 8 to 11 The cross section is formed by cutting the second slot 212 along the plane where the XZ plane of the central coordinate system is located.

[0072] The second slot 212 has an L-shaped cross section along the vertical direction. Figure 8 The second slot 212 has an arc-shaped cross-section along the vertical direction. Figure 9 The second slot 212 has an arc-shaped cross-section along the vertical direction. Figure 9 The second slot 212 has a step-like structure along the vertical section. Figure 10 shown.

[0073] Optionally, combined Figure 13 andFigure 14 As shown, the second notch 212 is a second external chamfer structure formed by means of an inclined chamfering process.

[0074] Specifically, the outer side of the outer edge of the cover plate 2 can be processed by means of an inclined chamfering process to form the second external chamfer structure, and this second external chamfer structure is the second notch 212. The second external chamfer structure is an inclined plane relative to the inner side wall of the cover plate 2.

[0075] Optionally, in combination with Figure 11 As shown, the end of the second notch 212 close to the inner edge of the housing body 1 is lower than, flush with, or higher than the opening edge of the housing body 1.

[0076] Specifically, taking the example of the vertical placement of the battery cell housing, the upper surface of the end of the second notch 212 close to the inner edge of the housing body 1 is lower than the upper surface of the housing body 1, as shown in Figure 11 shown.

[0077] The upper surface of the end of the second notch 212 close to the inner edge of the housing body 1 is flush with the opening edge (i.e., the upper surface) of the housing body 1, as shown in Figures 8 to 10 shown.

[0078] The upper surface of the end of the second notch 212 close to the inner edge of the housing body 1 is higher than the opening edge (i.e., the upper surface) of the housing body 1, which is not shown in the figure.

[0079] In this optional embodiment, since the end of the second notch 212 close to the inner edge of the housing body 1 is lower than or flush with the opening edge of the housing body 1, when welding is performed at the connection between the second notch 212 on the outer edge of the cover plate 2 and the inner edge of the housing body 1, not only can more solder be accommodated at the second notch 212 to form a wider weld seam 3, correspondingly increasing the connection strength between the cover plate 2 and the housing body 1, but also the formed weld seam 3 will not protrude beyond the outer side wall of the cover plate 2.

[0080] Optionally, the second notch 212 is an annular groove.

[0081] Specifically, since the second notch 212 is an annular groove, it means that after the cover plate 2 is sectioned in the horizontal direction, the second notch 212 is an annular groove with an annular structure.

[0082] In this optional embodiment, since the second notch 212 is an annular groove, when the weld seam 3 formed by the welding process at the connection between the outer edge of the cover plate 2 and the inner edge of the housing body 1 is also an annular structure, the connection sealing performance between the cover plate 2 and the housing body 1 can be effectively improved.

[0083] Optionally, the battery cell housing includes a cover plate 2, the housing body 1 has an opening 11, and the cover plate 2 is embedded at the opening 11;

[0084] Alternatively, the battery cell housing includes two cover plates 2, the housing body 1 has two opposite openings 11, and the two cover plates 2 are respectively embedded at the corresponding two openings 11.

[0085] Specifically, the number of cover plates 2 of the battery cell housing is at least one. For example, if the battery cell housing includes one cover plate 2, the housing body 1 can be a cuboid structure with five side walls, and the sixth face of the housing body 1 is provided with an opening 11, then the cover plate 2 is embedded at the opening 11.

[0086] If the battery cell housing includes two cover plates 2, the housing body 1 can be a cuboid structure with four side walls, and the two opposite faces of the housing body 1 without side walls are provided with openings 11. At this time, the two cover plates 2 are respectively embedded at the corresponding two openings 11.

[0087] A battery cell provided by an embodiment of the present invention includes the battery cell housing as described above, and further includes an electrolyte, a positive electrode plate, and a negative electrode plate. The electrolyte is disposed inside the housing body 1 of the battery cell housing, and the positive electrode plate and the negative electrode plate are disposed at intervals inside the housing body 1.

[0088] Specifically, the cover plate 2 of the battery cell housing is embedded at the opening 11 of the housing body 1 to encapsulate other components of the battery cell inside the battery cell housing. During the installation or use stage of the battery cell, it can be placed horizontally or vertically, and can be flexibly installed according to the installation scenario, which is not specifically limited herein.

[0089] The battery cell at least has all the technical effects of the battery cell housing, which will not be elaborated herein.

[0090] An electrical device provided by an embodiment of the present invention includes the battery cell as described in the above embodiment.

[0091] Specifically, the electrical device may include at least one battery cell, and further includes a battery box. At least one battery cell can be directly installed inside the battery box, or at least one battery cell can be fixedly installed inside the battery box through a bracket to form a battery module. The battery module can be installed on the main body of the electrical device in a fixed or detachable manner to realize the fixed installation of the battery cell.

[0092] The electrical device can be various electric vehicles, energy storage systems, or other devices that require battery cells, which is not specifically limited herein.

[0093] The beneficial effects of the electrical device in this embodiment compared with the prior art are the same as those of the above battery cell, which will not be elaborated herein.

[0094] Although the present utility model is disclosed as above, the protection scope of the present utility model is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present utility model, and these changes and modifications will all fall within the protection scope of the present utility model.

Claims

1. A battery cell shell, characterized in that it comprises a shell body (1), a weld (3) and a cover plate (2), wherein the shell body (1) is a shell structure with a hollow interior and an opening (11), the cover plate (2) is arranged at the opening (11) of the shell body (1), at least part of the cover plate (2) protrudes from the shell body (1), and the weld (3) is formed by welding the connection between the outer edge of the cover plate (2) and the opening edge of the shell body (1).

2. The battery cell shell according to claim 1 is characterized in that an escape groove (21) is provided on the outer edge of the cover plate (2), and the thickness of the cover plate (2) at the escape groove (21) is smaller than the thickness of its adjacent parts.

3. The battery cell shell according to claim 2 is characterized in that the avoidance groove (21) includes a first groove (211), and the first groove (211) is opened at the outer edge of the cover plate (2) facing the inner side of the shell body (1), and the first groove (211) is a first outer chamfered structure formed by a chamfering process.

4. The battery cell shell according to claim 2 or 3 is characterized in that the avoidance groove (21) also includes a second groove (212), and the second groove (212) is opened at the outer edge of the cover plate (2) facing the outer side of the shell body (1), and the weld (3) covers at least a part of the second groove (212).

5. The battery cell shell according to claim 4, characterized in that the vertical cross-section of the second slot (212) is at least one of a step-shaped structure, an L-shaped structure, and an arc-shaped structure.

6. The battery cell shell according to claim 4, characterized in that the second slot (212) is a second outer chamfered structure formed by a chamfering process.

7. The battery cell shell according to claim 4, characterized in that the end of the second slot (212) close to the inner edge of the shell body (1) is lower than, flush with or higher than the opening edge of the shell body (1).

8. The battery cell casing according to claim 4, characterized in that the second slot (212) is an annular slot.

9. The battery cell shell according to claim 1, characterized in that the battery cell shell comprises a cover plate (2), the shell body (1) has an opening (11), and the cover plate (2) is embedded in the opening (11); Alternatively, the battery cell housing comprises two cover plates (2), the housing body (1) has two openings (11) arranged opposite to each other, and the two cover plates (2) are respectively embedded in the corresponding two openings (11).

10. A battery cell, characterized in that it comprises the battery cell shell according to any one of claims 1 to 9, and further comprises an electrolyte, a positive electrode sheet and a negative electrode sheet, wherein the electrolyte is arranged in the shell body (1) of the battery cell shell, and the positive electrode sheet and the negative electrode sheet are arranged in the shell body (1) at intervals.

11. An electrical device, characterized by comprising the battery cell as claimed in claim 10.

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