Battery cell and electric device

Abstract

The invention relates to the technical field of batteries, in particular to a battery cell and a power utilization device.The battery cell comprises a shell, an electrode assembly and a supporting protrusion, the shell is provided with a containing space for containing the electrode assembly, and the connecting side wall of the shell is provided with a welding seam extending in the first direction. The first side face, facing the connecting side wall, of the electrode assembly is provided with a supporting protrusion, and the protruding height of the supporting protrusion relative to the side face of the electrode assembly is larger than or equal to the protruding height of the weld joint relative to the inner wall of the shell. According to the battery cell and the power utilization device provided by the invention, the insulation performance reduction and the internal short circuit risk caused by scratch are reduced, the space in the shell is saved, the material and processing cost is saved, and the structure for additionally arranging an exhaust channel is saved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and more particularly to an electric core and an electric device using the same. Background Art

[0002] The process of inserting the electric core into the shell during the manufacture of the electric core is undoubtedly a core link in the battery production process, and its precise execution is crucial for ensuring the performance and safety of the battery. In this process, the insulating film plays a crucial role. It acts as a solid barrier, effectively isolating the positive and negative electrodes of the electric core and preventing short circuits inside the battery due to direct contact. This is the cornerstone of the safe operation of the battery.

[0003] However, in actual operation, the process of inserting the electric core into the shell often faces the thorny problem of scratching the insulating film. The sharp edges or irregular protrusions at the butt weld of the shell are like hidden sharp blades, which can easily scratch the insulating film inadvertently. Such scratches not only weaken the isolation effect of the insulating film and reduce its insulation performance, but also may pose a hidden danger of internal short circuit of the battery, posing a direct threat to the overall performance and safety of the battery.

[0004] To address this problem, the current industry generally adopts the solution of setting side plates to isolate the direct contact between the electric core and the shell weld. Although this method can alleviate the problem of scratching the insulating film to a certain extent, its limitations are also significant. The introduction of side plates not only occupies valuable space inside the shell, resulting in the compression of the effective capacity of the electric core, thereby affecting the key performance index of the volume energy density of the electric core. At the same time, the manufacturing and installation processes of the side plates are accompanied by additional material costs and processing costs, increasing the number of battery parts and raising the overall production cost. This is undoubtedly a significant economic burden for battery manufacturers pursuing high efficiency and low cost. Summary of the Invention

[0005] The purpose of this application is to provide an electric core and an electric device using the same, so as to solve to a certain extent the technical problems existing in the prior art that during the process of inserting the electric core into the shell, the sharp edges or irregular protrusions at the butt weld of the shell are like hidden sharp blades, which can easily scratch the insulating film inadvertently, thereby affecting the insulation and safety of the electric core; and the current method of using side plates will also bring additional material costs and processing costs, increasing the number of battery parts and raising the overall production cost.

[0006] According to a first aspect of this application, an electric core is provided, including a shell, an electrode assembly, and a support protrusion. The shell is provided with an accommodation space for accommodating the electrode assembly, and a weld extending in a first direction is provided on the connecting side wall of the shell;

[0007] The first side of the electrode assembly facing the connecting side wall is provided with the support protrusion, and the height by which the support protrusion protrudes relative to the side of the electrode assembly is greater than or equal to the height by which the weld seam protrudes relative to the inner wall of the housing.

[0008] Preferably, the electrode assembly includes an electrode assembly body and an insulating portion covering the outside of the electrode assembly body, and the support protrusion is fixed to the insulating portion.

[0009] Preferably, the layer thickness of the insulating portion is m, where m ≥ 0.1 mm.

[0010] Preferably, both the housing and the electrode assembly are rectangular parallelepiped structures adapted to each other;

[0011] The connecting side wall is one of the two types of side walls of the housing extending in the first direction and having a smaller size.

[0012] Preferably, the electrode assembly further includes a second side facing away from the first side, and the second side is also provided with the support protrusion.

[0013] Preferably, the support protrusions are densely distributed on the first side and the second side in an array manner;

[0014] An avoidance area is provided at a position on the first side facing the weld seam, and the support protrusions on the first side are provided on a portion of the first side outside the avoidance area.

[0015] Preferably, the height by which the support protrusion protrudes relative to the side of the electrode assembly is L, and the height by which the weld seam protrudes relative to the inner wall of the housing is H, where 2 ≤ L / H ≤ 4.5.

[0016] Preferably, the height by which the support protrusion protrudes relative to the side of the electrode assembly is L, where 0.2 mm ≤ L ≤ 0.45 mm.

[0017] Preferably, an assembly opening for inserting the electrode assembly is provided at an end of the housing in the first direction, and a chamfer is provided at the inner edge of the assembly opening;

[0018] The dimension of the chamfer in the first direction is K, and the wall thickness of the housing is T, where 0.14 ≤ K / T ≤ 0.34.

[0019] According to a second aspect of the present application, an electrical device is provided, including the battery cell according to any one of the above technical solutions. Therefore, it has all the beneficial technical effects of this battery cell, and will not be elaborated here.

[0020] Compared with the prior art, the beneficial effects of the present application are:

[0021] The battery cell provided by this application creates a certain gap between the electrode assembly and the housing by setting support protrusions on the first side of the electrode assembly facing the connecting side wall. The setting of the support protrusions effectively isolates the sharp part of the weld from direct contact with the electrode assembly. In this way, even if the weld is uneven or has sharp edges, it will not pose a threat of scratching to the electrode assembly, thus greatly reducing the risk of insulation performance degradation and internal short circuit caused by scratching, and ingeniously solving the problem of the sharp edges or irregular protrusions of the weld scratching the electrode assembly and the insulating film. Abandoning the use of traditional side plates not only saves valuable space inside the housing but also provides a larger capacity space for the battery cell, thereby improving the volumetric energy density of the battery cell. This is undoubtedly a major technological breakthrough for battery products that pursue high energy density and long battery life. Moreover, omitting the side plates also means reducing the number of battery parts and manufacturing processes, which not only simplifies the production process, reduces the production difficulty, but also significantly saves materials and processing costs. For battery manufacturers, this means higher production efficiency and lower manufacturing costs, which helps to enhance the market competitiveness of products. In addition, the battery cell can also exhaust gas through the gap between the electrode assembly supported by the support protrusions and the housing, so as to save the structure of an additional exhaust channel.

[0022] To make the above objects, features, and advantages of this application more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, makes a detailed description as follows. Description of the Drawings

[0023] To more clearly illustrate the specific embodiments of this application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 Isometric structural schematic diagram of the battery cell provided by the embodiment of this application;

[0025] Figure 2 For Figure 1 Enlarged structural schematic diagram of the battery cell provided at A;

[0026] Figure 3 Cross-sectional structural schematic diagram of the battery cell provided by the embodiment of this application;

[0027] Figure 4 For Figure 3 Enlarged structural schematic diagram of the battery cell provided at B;

[0028] Figure 5Isometric structural schematic diagram of the insulating part provided by the embodiment of the present application;

[0029] Figure 6 Partial enlarged structural schematic diagram of the insulating part provided by the embodiment of the present application;

[0030] Figure 7 Cross-sectional structural schematic diagram of the housing provided by the embodiment of the present application;

[0031] Figure 8 Is Figure 7 Enlarged structural schematic diagram of the battery cell at C provided.

[0032] Reference numerals:

[0033] 1 - Housing; 11 - Weld seam; 12 - Chamfer; 2 - Electrode assembly; 21 - Insulating part; 211 - Support protrusion; 22 - Electrode assembly body; 23 - Tab; 3 - Cover plate; 4 - Insulating part; F1 - First direction; F2 - Second direction; F3 - Third direction. Detailed implementation manners

[0034] The following detailed implementation manners are provided to help the reader obtain a comprehensive understanding of the methods, devices, and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent. For example, the order of the operations described herein is merely an example and is not limited to the order set forth herein. Rather, changes that will be apparent after understanding the disclosure of the present application can be made, except for operations that must occur in a specific order. In addition, descriptions of features known in the art may be omitted for the sake of clarity and conciseness.

[0035] The features described herein can be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many possible ways of implementing the methods, devices, and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0036] Throughout the specification, when an element (such as, a layer, a region, or a substrate) is described as being "on" another element, "connected to" another element, "coupled to" another element, "above" another element, or "covering" another element, it can be directly "on" the other element, "connected to" the other element, "coupled to" the other element, "above" the other element, or "covering" the other element, or there can be one or more other elements intervening therebetween. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly coupled to" another element, "directly above" another element, or "directly covering" another element, there can be no other elements intervening therebetween.

[0037] As used herein, the term "and / or" includes any one of the listed related items and any combination of any two or more of them.

[0038] Although terms such as "first", "second", and "third" may be used herein to describe various components, elements, regions, layers, or parts, these components, elements, regions, layers, or parts are not limited by these terms. Rather, these terms are only used to distinguish one component, element, region, layer, or part from another. Thus, the first component, element, region, layer, or part described in the examples herein may also be referred to as the second component, element, region, layer, or part without departing from the teachings of the examples.

[0039] For ease of description, spatial relationship terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another as shown in the figures. Such spatial relationship terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as being "above" or "upper" relative to another element will then be "below" or "lower" relative to the other element. Thus, the term "above" includes both the orientations of "above" and "below" depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relationship terms used herein will be interpreted accordingly.

[0040] The terms used herein are for the purpose of describing various examples only and are not intended to limit the present disclosure. Unless the context clearly dictates otherwise, the singular forms are also intended to include the plural forms. The terms "comprising," "including," and "having" enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof that exist, but do not preclude the existence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0041] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Accordingly, the examples described herein are not limited to the specific shapes shown in the drawings, but include changes in shape that occur during manufacturing.

[0042] The features of the examples described herein can be combined in various ways that will be apparent after understanding the disclosure of the present application. Additionally, although the examples described herein have a variety of configurations, other configurations are possible, as will be apparent after understanding the disclosure of the present application.

[0043] Reference is made below Figures 1 to 8 to describe a battery cell and an electrical device using the same according to some embodiments of the present application.

[0044] Referring to Figures 1 to 8 as shown, an embodiment of the first aspect of the present application provides a battery cell, which includes a housing 1, an electrode assembly 2, and a support protrusion 211. The housing 1 is provided with a receiving space for receiving the electrode assembly 2, and a weld seam 11 extending in a first direction F1 is provided on a connecting side wall of the housing 1. A support protrusion 211 is provided on a first side of the electrode assembly 2 facing the connecting side wall, and the height by which the support protrusion 211 protrudes relative to the side surface of the electrode assembly 2 is greater than or equal to the height by which the weld seam 11 protrudes relative to the inner wall of the housing 1.

[0045] According to the cell provided by the above technical features, by providing a support protrusion 211 on the first side of the electrode assembly 2 facing the connecting side wall, the provision of the support protrusion 211 can create a certain gap between the electrode assembly 2 and the housing 1, and this gap effectively isolates the sharp part of the weld 11 from direct contact with the electrode assembly 2. In this way, even if the weld 11 has uneven or sharp edges, it will not pose a threat of scratching to the electrode assembly 2, thus greatly reducing the risk of insulation performance degradation and internal short circuit caused by scratching, and skillfully solving the problem of the sharp edges or irregular protrusions of the weld 11 scratching the electrode assembly 2 and the insulating film; the use of traditional side plates is abandoned, which not only saves valuable space inside the housing, but also provides a larger capacity space for the cell, thereby improving the volumetric energy density of the cell. This is undoubtedly a major technical breakthrough for battery products pursuing high energy density and long battery life; furthermore, omitting the side plates also means reducing the number of battery parts and manufacturing processes, which not only simplifies the production process, reduces the production difficulty, but also significantly saves materials and processing costs. For battery manufacturers, this means higher production efficiency and lower manufacturing costs, which helps to enhance the market competitiveness of products; in addition, the cell can also exhaust gas through the gap between the electrode assembly 2 supported by the support protrusion 211 and the housing 1 to save the structure of additionally providing an exhaust channel.

[0046] It should be noted that the above housing 1 can be formed by enclosing one or more plates. For example, the plates can be processed by forming processes such as bending or folding according to a predetermined shape and structure, and finally combined into a complete housing 1. The above weld 11 can be understood as the trace formed by welding at the joint of the plates.

[0047] Preferably, as Figures 1 to 4 shown, the figure shows an example in which a plate is bent and the head and tail are connected to form a cylindrical structure. In other words, the figure shows an example in which the number of welds 11 is one, but it is not limited thereto. The number of welds 11 can be adaptively adjusted according to the specific splicing structure of the housing 1. Correspondingly, the number of the first avoidance portions of the above electrode assembly 2 corresponds one-to-one to the number of the welds 11.

[0048] Preferably, as Figure 1 shown, the above weld 11 can extend from one end of the housing 1 in the first direction F1 to the other end to ensure the sealing performance of the housing 1.

[0049] Preferably, as Figure 5 shown, the number of the support protrusions 211 provided on the above first side can be multiple, and the multiple support protrusions 211 can be arranged at intervals on the first side along the first direction F1 to ensure the comprehensiveness of the support for the weld 11.

[0050] Optionally, not shown in the figures, the above-mentioned supporting protrusions may also be strip-shaped protrusions extending along the first direction F1 to ensure comprehensive support for the weld.

[0051] Furthermore, if Figure 5 As shown, the above-mentioned support protrusions 211 can be distributed in an array on the first side surface to ensure the consistency of the gap spacing between the first side surface and the connecting side wall, thereby ensuring the stability and anti-movement of the electrode assembly 2 in the shell 1.

[0052] Preferably, if Figure 2 As shown, an avoidance zone is provided at a position of the first side surface directly opposite to the weld 11, and the support protrusion 211 on the first side surface is provided at a portion of the first side surface outside the avoidance zone. In other words, the support protrusion 211 and the weld 11 are staggered to avoid the weld 11 from damaging the support protrusion 211.

[0053] Preferably, if Figures 1 to 6 As shown, the electrode assembly 2 may include an electrode assembly body 22 and an insulating portion 21 covering the outside of the electrode assembly body 22 , and the supporting protrusion 211 is fixed to the insulating portion 21 .

[0054] Alternatively, if Figure 6 As shown, the insulating portion 21 may be an insulating film coating layer having a certain thickness formed by wrapping the electrode assembly body 22 with an insulating film, so as to achieve insulation between the electrode assembly 2 and the shell 1 .

[0055] Preferably, the above-mentioned support protrusion 211 can be a protrusion structure formed on the surface of the insulating film coating layer by a hot pressing molding process. In this way, the surface of the support protrusion 211 after the hot pressing process will undergo heat shrinkage and hardening, which can effectively improve the surface strength of the support protrusion 211 and reduce the chance of being cut.

[0056] Preferably, if Figure 6 As shown, the layer thickness of the insulating part 21 is m, wherein m≥0.1 mm, so as to ensure the insulation of the insulating part 21 and the completeness of wrapping the electrode assembly body 22 .

[0057] Preferably, if Figure 4 and Figure 6 As shown, the height of the support protrusion 211 protruding relative to the side of the electrode assembly 2 is L, and the height of the weld 11 protruding relative to the inner wall of the shell 1 is H, wherein 2≤L / H≤4.5, which can not only ensure the supporting effectiveness of the support protrusion 211 (i.e., avoiding contact between the weld 11 and the insulating portion 21) and the risk exhaust capacity between the electrode assembly 2 and the shell 1; but also effectively ensure the space utilization rate of the shell 1.

[0058] Preferably, if Figure 6As shown, 0.2 mm ≤ L ≤ 0.45 mm, which not only facilitates the manufacture of the support protrusion 211, but also ensures the support effectiveness of the support protrusion 211.

[0059] Preferably, as Figure 2 and Figure 4 shown, the above-mentioned support protrusion 211 can be hemispherical, however, it is not limited thereto. As long as it can achieve the formation of a support gap between the electrode assembly 2 and the housing 1, the above-mentioned support protrusion 211 can also be semi-ellipsoidal, multi-prismatic, multi-prismatoid or other irregular convex dot shapes.

[0060] In the embodiment, preferably, as Figures 1 to 8 shown, the figure shows an example in which the above-mentioned cylindrical structure is a rectangular parallelepiped cylinder to adapt to the structure of a square battery. Correspondingly, the above-mentioned electrode assembly 2 can be a rectangular parallelepiped adapted to the rectangular parallelepiped cylinder, however, it is not limited thereto. The above-mentioned cylindrical structure can also be cylindrical, multi-prismatic, elliptical cylindrical or other special-shaped cylindrical.

[0061] The above-mentioned battery cell will be described in detail below by taking the example in which the above-mentioned cylindrical structure is a rectangular parallelepiped cylinder.

[0062] As Figures 1 to 8 shown, F1 shown in the figure can be an example of the above-mentioned first direction F1. For the convenience of description, two directions perpendicular to each other on the plane perpendicular to the first direction F1 are respectively defined as the second direction F2 and the third direction F3. F2 shown in the figure can be an example of the above-mentioned second direction F2, and F3 shown in the figure can be an example of the above-mentioned third direction F3. Preferably, as Figures 1 to 8 shown, the first direction F1 can be the length direction of the housing 1, the second direction F2 can be the width direction of the housing 1, and the third direction F3 can be the thickness direction of the housing 1.

[0063] Preferably, as Figures 1 to 8 shown, the connecting side wall can be one of the two types of side walls of the housing 1 extending along the first direction F1 with a smaller size. In other words, the above-mentioned connecting side wall can be on the narrow side surface of the housing 1, and the narrow side surface can be the side wall of the housing 1 parallel to the plane determined by both the first direction F1 and the third direction F3. In this way, setting the weld 11 on the narrow side surface can effectively ensure the cleanliness of the housing 1.

[0064] The above-mentioned electrode assembly 2 can further include a second side surface disposed opposite to the first side surface. Further, as Figure 3 and Figure 5 shown, the second side surface can also be provided with the support protrusion 211 so that a certain exhaust gap can also be formed between the second side surface and the housing 1, further ensuring the exhaust smoothness inside the battery cell housing.

[0065] It should be noted that the support protrusions 211 arranged on the second side are similar to the support protrusions 211 arranged on the first side, and will not be elaborated here.

[0066] In the embodiment, as Figure 1 and Figure 8 shown, preferably, an assembly port for inserting the power supply electrode assembly 2 is provided at the end of the housing 1 in the first direction F1, so as to facilitate the insertion of the electrode assembly 2 into the housing 1 along the first direction F1.

[0067] As Figure 1 shown, the figure shows an example in which assembly ports are provided at both ends of the above-mentioned housing 1 in the first direction F1. However, it is not limited thereto, and the above-mentioned assembly port may also be provided only at one end of the housing 1 in the first direction F1.

[0068] Preferably, as Figure 8 shown, a chamfer 12 may be provided on the inner edge of the above-mentioned assembly port to facilitate the loading of the electrode assembly 2.

[0069] Preferably, as Figure 8 shown, the dimension of the above-mentioned chamfer 12 in the first direction F1 is K, and the wall thickness of the housing 1 is T, where 0.14 ≤ K / T ≤ 0.34, so as to balance the setting strength at the chamfer 12 and the guiding ability for the electrode assembly 2.

[0070] Referring to Table 1, it shows a statistical table of experimental results obtained by respectively adjusting the values of the above-mentioned m, k, L, and H for the same type of battery cells, making multiple groups of specimens for each set of values, and respectively performing shelling operations, airtightness tests, and thermal runaway tests on each group of specimens.

[0071] Table 1:

[0072]

[0073]

[0074] In the embodiment, as Figure 1 and Figure 2 shown, the above-mentioned electrode assembly 2 may further include a tab 23. The figure shows an example in which the tab 23 is provided on both sides of the electrode assembly body 22 in the first direction F1. However, it is not limited thereto, and the tab 23 may also be provided only on one side of the electrode assembly 2 in the first direction F1.

[0075] Preferably, as Figure 1 and Figure 2 shown, the above-mentioned electrode assembly 2 may further include a cover plate 3, and the cover plate 3 may be covered on the end of the housing 1 in the first direction F1 to block the end of the housing 1.

[0076] Preferably, as Figure 1 and Figure 2 shown, the above-mentioned electrode assembly 2 may further include an insulating member 4, and the insulating member 4 may be disposed between both the electrode assembly body 22 and the cover plate 3 to achieve insulation between the electrode assembly body 22 and the cover plate 3.

[0077] Preferably, a pole post may be provided on the above-mentioned cover plate 3. Correspondingly, the above-mentioned tab 23 can penetrate through the insulating member 4 along the first direction F1 to achieve electrical connection between the electrode assembly body 22 and the pole post on the cover plate 3.

[0078] An embodiment of the second aspect of the present application further provides an electrical device, including the battery cell described in any of the above embodiments. Therefore, it has all the beneficial technical effects of this battery cell and will not be elaborated here.

[0079] Finally, it should be noted that: the above-mentioned embodiments are only specific implementation manners of the present application, used to illustrate the technical solutions of the present application, rather than limiting it. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: any person skilled in the art within the technical scope disclosed by the present application can still modify the technical solutions recorded in the foregoing embodiments or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A battery cell, characterized in that: The invention comprises a shell, an electrode assembly and a supporting protrusion, wherein the shell is provided with a receiving space for receiving the electrode assembly, and a connecting side wall of the shell is provided with a welding seam extending along a first direction; The supporting protrusion is provided on the first side surface of the electrode assembly facing the connecting side wall, and the height of the supporting protrusion protruding relative to the side surface of the electrode assembly is greater than or equal to the height of the welding seam protruding relative to the inner wall of the shell.

2. The battery cell according to claim 1, characterized in that: The electrode assembly includes an electrode assembly body and an insulating portion covering the outer side of the electrode assembly body, and the supporting protrusion is fixed to the insulating portion.

3. The battery cell according to claim 2, characterized in that: The layer thickness of the insulating part is m, wherein m≥0.1 mm.

4. The battery cell according to claim 1, characterized in that: The shell and the electrode assembly are both rectangular parallelepiped structures adapted to each other; The connecting side wall is one of the two types of side walls of the housing extending along the first direction and having a smaller size.

5. The battery cell according to claim 2, characterized in that: The electrode assembly further includes a second side surface disposed opposite to the first side surface, and the second side surface is also provided with the supporting protrusion.

6. The battery cell according to claim 5, characterized in that: The supporting protrusions are distributed on the first side surface and the second side surface in an array manner; A avoidance zone is arranged at a position of the first side surface directly opposite to the weld, and the supporting protrusion on the first side surface is arranged at a portion of the first side surface outside the avoidance zone.

7. The battery cell according to claim 1, characterized in that: The height of the supporting protrusion protruding relative to the side surface of the electrode assembly is L, and the height of the welding seam protruding relative to the inner wall of the shell is H, wherein 2≤L / H≤4.

5.

8. The battery cell according to claim 1, characterized in that: The height of the supporting protrusion relative to the side surface of the electrode assembly is L, wherein 0.2mm≤L≤0.45mm.

9. The battery cell according to claim 1, characterized in that: An assembly opening for inserting the electrode assembly is provided at the end of the shell in the first direction, and an inner edge of the assembly opening is provided with a chamfer; The dimension of the chamfer in the first direction is K, and the wall thickness of the shell is T, wherein 0.14≤K / T≤0.

34.

10. An electrical device, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 9.

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