Battery monomer and electric equipment

Abstract

The utility model relates to the technical field of batteries, and particularly provides a single battery and electric equipment, the single battery comprises a shell, an opening and an accommodating cavity communicated with the opening; the first cover plate assembly is arranged in the containing cavity, the first cover plate assembly comprises a first cover plate and a first pole arranged on the first cover plate, the first cover plate is connected with the shell, and a first containing space is defined between the first cover plate assembly and the shell; the battery cell is accommodated in the first accommodating space; the second cover plate assembly comprises a second cover plate and a second pole arranged on the second cover plate, the second cover plate seals the opening, and the second pole is electrically connected with the first pole. Through the first cover plate assembly and the second cover plate assembly, the battery is subjected to multi-layer packaging, so that the sealing reliability of the battery is improved, and the possibility of electrolyte leakage caused by rubber aging of the end cover assembly along with the use of the battery cell is avoided.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and in particular to a battery cell and an electrical device. Background Technology

[0002] Among numerous energy storage devices such as lead-acid batteries and solar cells, lithium-ion batteries have been widely used in mobile devices (3C), electric vehicles, energy storage power supplies, and many other fields due to their advantages such as long cycle life, high energy density, high power performance, and good safety performance. With the accelerating pace of modern life, consumers have increasingly higher expectations for the lifespan and safety of lithium-ion batteries.

[0003] In existing technologies, the sealing structure of lithium-ion batteries is typically ensured by the casing and cover. Although welding, edge rolling, and other methods are used to ensure the degree of sealing, and sealing rings and other devices can also be used to guarantee the sealing, as the battery cells are used, both the casing and cover are affected by the internal pressure of the battery, and the sealing rings will also age. This makes it easier for external air to enter the battery and for electrolyte to leak, both of which can cause battery failure and reduce battery life. Utility Model Content

[0004] The present invention provides a battery cell and electrical device that at least solves the problem in the related art where battery end caps are prone to electrolyte leakage due to changes in internal pressure and aging of the sealing ring as usage time increases.

[0005] In a first aspect, the present invention provides a battery cell, comprising: a housing having an opening and a receiving cavity communicating with the opening; a first cover assembly disposed within the receiving cavity, the first cover assembly including a first cover plate and a first terminal post disposed on the first cover plate, the first cover plate being connected to the housing, and a first receiving space being formed between the first cover assembly and the housing; a battery cell disposed in the first receiving space; and a second cover assembly including a second cover plate and a second terminal post disposed on the second cover plate, the second cover plate sealing the opening, and the second terminal post being electrically connected to the first terminal post.

[0006] As an embodiment of the present invention, a second accommodating space is formed in the accommodating cavity and between the first cover plate and the second cover plate, and an adsorption layer for adsorbing moisture and / or electrolyte is provided in the second accommodating space.

[0007] In one embodiment of this utility model, the first cover plate is further provided with a first explosion-proof valve plate, and the second cover plate is further provided with a second explosion-proof valve plate; the strength of the second explosion-proof valve plate is lower than the strength of the first explosion-proof valve plate.

[0008] In one embodiment of this utility model, the thickness of the second explosion-proof valve plate is less than the thickness of the first explosion-proof valve plate; and / or, the scoring depth of the second explosion-proof valve plate is greater than the scoring depth of the first explosion-proof valve plate; and / or, the number of scoring marks on the second explosion-proof valve plate is greater than the number of scoring marks on the first explosion-proof valve plate; and / or, the material strength of the second explosion-proof valve plate is less than the material strength of the first explosion-proof valve plate.

[0009] As an embodiment of the present invention, the first cover plate assembly further includes a first insulating plate, which is connected to the side of the first cover plate facing the battery cell; the first insulating plate is provided with an exhaust structure at the position opposite to the first explosion-proof valve plate; the second cover plate assembly further includes a second insulating plate, which is connected to the side of the second cover plate facing the first cover plate; the second insulating plate is provided with an exhaust hole at the position opposite to the second explosion-proof valve plate.

[0010] As one embodiment of this utility model, it also includes a conductive element that connects the second pole and the first pole.

[0011] As one embodiment of the present invention, the conductive component includes a first connecting part, a bending part, and a second connecting part connected in sequence, wherein the first connecting part is connected to a first pole post, and the second connecting part is connected to a second pole post.

[0012] In one embodiment of this utility model, the strength of the bent portion is less than the strength of the first connecting portion and less than the strength of the second connecting portion.

[0013] In one embodiment of this utility model, the thickness of the bent portion is less than the thickness of the first connecting portion and less than the thickness of the second connecting portion; and / or, the width of the bent portion is less than the width of the first connecting portion and less than the width of the second connecting portion; and / or, the bent portion includes a base connecting the first connecting portion and the second connecting portion, and the base is provided with a through hole and / or a groove.

[0014] Secondly, this utility model also provides an electrical device, including the aforementioned battery cell.

[0015] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial effects:

[0016] This utility model discloses a battery cell and electrical device that connects the first terminal of the first cover assembly to the battery cell, and the second terminal of the second cover assembly to the first terminal, ensuring the conductivity of the outer second terminal without affecting battery use. The battery is double-encapsulated through the first and second cover assemblies, improving the battery's sealing reliability and preventing electrolyte leakage caused by rubber aging of the end cap assembly during battery cell use. This solves the problem in related technologies where battery end caps are prone to electrolyte leakage due to internal pressure changes and sealing ring aging over time. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0018] Figure 1 This is a schematic diagram of the structure of a battery cell in an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the connection structure between the first cover plate assembly and the second cover plate in an embodiment of this utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the first cover plate assembly in an embodiment of this utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the first insulating plate in an embodiment of this utility model;

[0022] Figure 5 This is a schematic diagram of the structure of the second cover plate assembly in an embodiment of the present invention;

[0023] Figure 6 This is a schematic diagram of the structure of the second insulating plate in an embodiment of this utility model;

[0024] Figure 7 This is a schematic diagram of the conductive element in an embodiment of this utility model.

[0025] The above figures include the following reference numerals:

[0026] 1. Housing; 2. First cover plate assembly; 20. First cover plate; 21. First pole post; 22. First explosion-proof valve plate; 3. Second cover plate assembly; 30. Second cover plate; 31. Second pole post; 32. Second explosion-proof valve plate; 4. Conductive component; 41. First connecting part; 42. Bending part; 43. Second connecting part; 5. Adsorption layer; 6. First insulating plate; 61. First mounting hole; 62. Exhaust structure; 63. Base plate; 64. Flip plate; 7. Second insulating plate; 71. Second mounting hole; 72. Exhaust through hole; 8. Liquid injection hole; 9. Snap-fit ​​hole; 10. Snap-fit. Detailed Implementation

[0027] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0029] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0030] Reference Figures 1 to 7 As shown, this utility model provides a battery cell, including: a housing 1, a first cover plate assembly 2, and a second cover plate assembly 3.

[0031] like Figure 1 As shown, the housing 1 has an opening and a receiving cavity communicating with the opening. The receiving cavity is used to accommodate the first cover plate assembly 2, the battery cell, and the injected electrolyte. The opening is for installing the second cover plate assembly 3. The first cover plate assembly 2 and the second cover plate assembly 3, designed in a matching manner, form a double seal for the receiving cavity, thereby improving the isolation between the electrolyte in the receiving cavity and the external air of the battery. That is, on the one hand, it can prevent the electrolyte from leaking to the outside of the battery, and on the other hand, it can also prevent external air from entering the battery. This solves the problem in related technologies where electrolyte leakage is prone to occur due to changes in internal pressure and aging of the sealing ring after the battery has been used for a long time.

[0032] It should be noted that the second cover assembly 3 is used to seal the opening, while the first cover assembly 2 is disposed within the accommodating cavity. Therefore, theoretically, the more first cover assemblies 2 are provided, the better the sealing performance for the battery cell. However, considering factors such as the energy density, sealing performance, and weight of the battery cell, this embodiment designs one second cover assembly 3 and one first cover assembly 2, thus balancing the sealing requirements of the battery cell with the requirements for energy density, weight, and size.

[0033] like Figure 1 As shown, the first cover plate assembly 2 is disposed within the accommodating cavity. Its main function is to divide the accommodating cavity, so that the housing 1 and the first cover plate assembly 2 enclose a first accommodating space for accommodating the battery cell and electrolyte.

[0034] Specifically, the first cover plate assembly 2 includes a first cover plate 20 and a first pole post 21 disposed on the first cover plate 20.

[0035] It should be noted that the number of first terminals 21 is determined according to design requirements. That is, multiple first terminals 21 with different polarities can be provided on the first cover plate 20, for example, two positive terminals and two negative terminals; or, two first terminals 21 with different polarities can be provided on the first cover plate 20, for example, one positive terminal and one negative terminal. Furthermore, when two or more first terminals 21 with different polarities are provided on the first cover plate 20, the positive and negative terminals with different polarities must be insulated from each other. For example, the positive terminal is insulated from the first cover plate 20, and the negative terminal is insulated from the first cover plate 20.

[0036] The first cover plate 20 is connected to the housing 1. To ensure the airtightness of the connection between the first cover plate 20 and the housing 1, the first cover plate 20 and the housing 1 are connected by welding. In addition, a first accommodating space is formed between the first cover plate assembly 2 and the housing 1, and the battery cell is accommodated in the first accommodating space.

[0037] Since the first cover plate assembly 2 is directly electrically connected to the battery cell, a first accommodating space needs to be separated in the accommodating cavity to accommodate the battery cell in the first accommodating space, and to electrically connect the battery cell's tabs to the first terminal post 21 of the first cover plate assembly 2.

[0038] Continued Figure 1 As shown, the second cover assembly 3 seals the opening of the housing 1. Specifically, the second cover assembly 3 includes a second cover 30.

[0039] It should be noted that the second cover plate 30 is used to seal the opening, so the structural shape of the second cover plate 30 matches the structural shape of the opening; while the first cover plate 20 is connected to the shell 1, so the structural shape of the first cover plate 20 matches the structural shape of the shell 1, based on the fact that the first cover plate 20 can pass through the opening; in particular, in order to facilitate processing and manufacturing, the size of the opening is designed to be the same as the cross-sectional size of the accommodating cavity of the shell 1, that is, the shape and size of the first cover plate 20 and the second cover plate 30 are the same.

[0040] Continued Figure 1 As shown, since the first terminal 21 of the first cover plate assembly 2 is directly connected to the battery cell but is not exposed to the outside of the battery, in order to ensure that the first terminal 21 can be electrically connected to external devices, the second cover plate assembly 3 also includes a second terminal 31 disposed in the second cover plate 30, so that the first terminal 21 and the first terminal 31 with the same polarity are electrically connected.

[0041] Specifically, such as Figure 2 As shown, a second accommodating space is formed within the accommodating cavity and between the first cover plate 20 and the second cover plate 30. The conductive element 4 is located within the second accommodating space, and the second pole post 31 and the first pole post 21 can be connected through the conductive element 4.

[0042] Understandable, such as Figure 1 As shown, the first cover plate 20 divides the enclosed space formed by the second cover plate 30 and the housing 1 into two parts, namely a first accommodating space and a second accommodating space. The second accommodating space is used to accommodate the conductive component 4 so that the conductive component 4 can be welded to the first pole post 21 and the second pole post 31 to realize the electrical connection between the first pole post 21 and the second pole post 31.

[0043] It should be noted that the conductive element 4 can be a flexible wire, such as a copper wire or an aluminum wire; the conductive element 4 can also be a rigid sheet structure, such as a copper sheet or an aluminum sheet.

[0044] Specifically, in this embodiment, such as Figure 2 and Figure 7 As shown, the conductive component 4 has a sheet-like structure, including a first connecting part 41, a bending part 42, and a second connecting part 43 connected in sequence. The first connecting part 41 is connected to the first pole post 21, and the second connecting part 43 is connected to the second pole post 31.

[0045] The bending part 42 can be bent at will as needed, so as to meet the electrical connection requirements of any distance within the distance range between the first pole 21 and the second pole 31.

[0046] It should be noted that, for ease of bending, the strength of the bending portion 42 is designed to be less than the strength of the first connecting portion 41 and less than the strength of the second connecting portion 43. There are several ways to reduce the strength of the bending portion 42: the thickness of the bending portion 42 is less than the thickness of the first connecting portion 41 and less than the thickness of the second connecting portion 43; and / or, the width of the bending portion 42 is less than the width of the first connecting portion 41 and less than the width of the second connecting portion 43; and / or, the bending portion 42 includes a base connecting the first connecting portion 41 and the second connecting portion 43, and the base is provided with through holes and / or grooves. Thus, by combining any corresponding methods in terms of thickness, width, and structural strength, the strength of the bending portion can be reduced, making the strength of the bending portion 42 less than the strength of the first connecting portion 41 and the second connecting portion 43.

[0047] As an embodiment of this utility model, in order to make full use of the space other than the conductive component 4 in the second accommodating space, an adsorption layer 5 for adsorbing moisture and / or electrolyte is designed to be provided in the second accommodating space.

[0048] In this embodiment, by providing the adsorption layer 5, moisture and / or electrolyte can be adsorbed, ensuring the effective sealing of the second cover assembly 3. When the sealing of the first cover assembly 2 fails, moisture and / or electrode liquid overflowing from the first accommodating space can be adsorbed promptly, preventing corrosion of the battery's internal structure. Alternatively, when the sealing of the second cover assembly 3 fails but the sealing of the first cover assembly 2 is effective, moisture that may enter the battery cell can be promptly absorbed, thereby extending the battery cell's lifespan.

[0049] In one embodiment of the adsorption layer 5, the adsorption layer 5 includes a first adsorbent material and a second adsorbent material; the first adsorbent material is used to adsorb moisture, and the second adsorbent material is used to adsorb electrolyte, wherein the ratio of the first adsorbent material and the second adsorbent material is in the range of 1:1 to 1:3. The adsorption layer is formed by mixing the first adsorbent material and the second adsorbent material.

[0050] In another embodiment of the adsorption layer 5, the adsorption layer 5 includes a first isolation layer and a second isolation layer; the first isolation layer includes a first adsorbent material for adsorbing moisture; the second isolation layer includes a second adsorbent material for adsorbing electrolyte.

[0051] Since the electrolyte will only overflow from inside the battery, in order to improve the adsorption effect, the first adsorption material and the second adsorption material can be set in layers to achieve a better adsorption effect. That is, the first isolation layer is set close to the second cover plate 30, and the second isolation layer is set close to the first cover plate 20.

[0052] It should be noted that, in order to avoid interference between the first adsorbent material and the second adsorbent material, a water-permeable but electrolyte-permeable membrane can also be provided between the first isolation layer and the second isolation layer.

[0053] like Figure 3 and Figure 5 As shown in the figure, in order to ensure the explosion capability of the battery cell while also considering its explosion timeliness, the first cover plate 20 is also provided with a first explosion-proof valve plate 22, and the second cover plate 30 is also provided with a second explosion-proof valve plate 32; the strength of the second explosion-proof valve plate 32 is lower than the strength of the first explosion-proof valve plate 22.

[0054] Understandably, when a battery is improperly charged, short-circuited, or abused, a large amount of gas will be generated inside the battery, and the temperature will rise sharply. If there is no first explosion-proof valve plate 22 on the first cover plate 20, the battery cell will explode. Therefore, the first cover plate 20 must be equipped with a first explosion-proof valve plate 22 to allow the gas to break through the first explosion-proof valve plate 22 and escape from the first accommodating space. Considering that although the existence of the second accommodating space can provide some buffer for the gas escaping from the first accommodating space, a large amount of gas is generally generated when thermal runaway occurs. Therefore, in order to prevent the battery cell from exploding, a second explosion-proof valve plate 32 needs to be installed on the second cover plate 30.

[0055] Furthermore, to avoid the additional second explosion-proof valve 32 affecting the timeliness of battery cell explosion compared to existing battery cells with only one explosion-proof valve, the strength of the second explosion-proof valve 32 is designed to be lower than that of the first explosion-proof valve 22. In other words, when the internal pressure of the battery increases, the second explosion-proof valve 32 is more likely to explode than the first explosion-proof valve 22. This ensures that the second explosion-proof valve 32 can also explode in time after the first explosion-proof valve 22 explodes, thus preventing the battery cell from exploding.

[0056] Specifically, since the strength of the explosion-proof valve plate is related to its own structure, there are several ways to make the strength of the second explosion-proof valve plate 32 lower than that of the first explosion-proof valve plate 22: the thickness of the second explosion-proof valve plate 32 is less than the thickness of the first explosion-proof valve plate 22; and / or, the scoring depth of the second explosion-proof valve plate 32 is greater than that of the first explosion-proof valve plate 22; and / or, the number of scoring marks on the second explosion-proof valve plate 32 is greater than that on the first explosion-proof valve plate 22; and / or, the material strength of the second explosion-proof valve plate 32 is less than that of the first explosion-proof valve plate 22.

[0057] Thus, by combining any combination of factors related to thickness, groove depth, number of grooves, and material strength, the strength of the explosion-proof valve plate can be weakened. This ensures that the strength of the first explosion-proof valve plate 22 meets the battery pressure relief requirements while making the strength of the second explosion-proof valve plate 32 lower than that of the first explosion-proof valve plate 22.

[0058] As one embodiment of this utility model, such as Figure 4 As shown, the first cover plate assembly 2 also includes a first insulating plate 6, which is connected to the side of the first cover plate 20 facing the battery cell, and the first insulating plate 6 isolates the battery cell from the first cover plate 20.

[0059] The first insulating plate 6 includes a base plate 63 and a flip plate 64. The base plate 63 is connected to the first cover plate 20. The flip plate 64 and the base plate 63 are flip-connected. The base plate 63 is provided with an injection hole 8, a first mounting hole 61, an exhaust structure 62 and a snap-fit ​​hole 9. The flip plate 64 is provided with a snap-fit ​​10. The base plate 63 is used to isolate the battery cell and the first cover plate. The flip plate 64 is used to guide the bending of the battery cell's tabs.

[0060] Understandably, the injection hole 8 is used to allow the electrolyte to pass through during injection; the first mounting hole 61 is used to allow the first pole post 21 to pass through; the exhaust structure 62 is positioned opposite the first explosion-proof valve plate 22 so that gas can break through the first explosion-proof valve plate 22 after passing through the exhaust structure 62; the buckle hole 9 and the buckle 10 are detachably connected.

[0061] Continuing, such as Figure 6 As shown, the second cover plate assembly 3 also includes a second insulating plate 7, which is connected to the side of the second cover plate 30 facing the first cover plate 20.

[0062] The second insulating plate 7 does not involve welding of the battery cell tabs, so only one base plate is provided, on which the second mounting hole 71 corresponding to the second pole post 31 is opened.

[0063] Correspondingly, considering that the second explosion-proof valve plate 32 also needs to withstand pressure, the second insulating plate 7 is provided with an exhaust hole 72 at the position opposite to the second explosion-proof valve plate 32.

[0064] This utility model also provides an electrical device, including the aforementioned battery cell.

[0065] Since the technical effects of the aforementioned battery cells have already been explained, the corresponding electrical equipment will also have the technical effects of the aforementioned battery cells, and will not be repeated here.

[0066] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0067] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0068] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery cell, characterized in that, include: The housing (1) is provided with an opening and a receiving cavity communicating with the opening; A first cover plate assembly (2) is disposed in the accommodating cavity. The first cover plate assembly (2) includes a first cover plate (20) and a first pole post (21) disposed on the first cover plate (20). The first cover plate (20) is connected to the housing (1), and a first accommodating space is formed between the first cover plate assembly (2) and the housing (1). The battery cell is housed in the first accommodating space; The second cover plate assembly (3) includes a second cover plate (30) and a second pole post (31) disposed on the second cover plate (30), the second cover plate (30) sealing the opening, and the second pole post (31) and the first pole post (21) being electrically connected.

2. The battery cell according to claim 1, characterized in that, A second accommodating space is formed within the accommodating cavity and between the first cover plate (20) and the second cover plate (30), and an adsorption layer (5) for adsorbing moisture and / or electrolyte is provided in the second accommodating space.

3. The battery cell according to claim 1, characterized in that, The first cover plate (20) is also provided with a first explosion-proof valve plate (22), and the second cover plate (30) is also provided with a second explosion-proof valve plate (32). The strength of the second explosion-proof valve plate (32) is lower than that of the first explosion-proof valve plate (22).

4. The battery cell according to claim 3, characterized in that, The thickness of the second explosion-proof valve plate (32) is less than the thickness of the first explosion-proof valve plate (22); And / or, the scoring depth of the second explosion-proof valve plate (32) is greater than the scoring depth of the first explosion-proof valve plate (22); And / or, the number of grooves on the second explosion-proof valve plate (32) is greater than the number of grooves on the first explosion-proof valve plate (22); And / or, the material strength of the second explosion-proof valve plate (32) is less than the material strength of the first explosion-proof valve plate (22).

5. The battery cell according to claim 3 or 4, characterized in that, The first cover plate assembly (2) further includes a first insulating plate (6), which is connected to the side of the first cover plate (20) facing the battery cell; an exhaust structure (62) is provided on the first insulating plate (6) directly opposite the first explosion-proof valve plate (22). The second cover plate assembly (3) further includes a second insulating plate (7), which is connected to the side of the second cover plate (30) facing the first cover plate (20); the second insulating plate (7) is provided with an exhaust hole (72) at the position opposite to the second explosion-proof valve plate (32).

6. The battery cell according to claim 1, characterized in that, It also includes a conductive element (4) that connects the second pole (31) and the first pole (21).

7. The battery cell according to claim 6, characterized in that, The conductive component (4) includes a first connecting part (41), a bending part (42), and a second connecting part (43) connected in sequence. The first connecting part (41) is connected to the first pole post (21), and the second connecting part (43) is connected to the second pole post (31).

8. The battery cell according to claim 7, characterized in that, The strength of the bent portion (42) is less than the strength of the first connecting portion (41) and less than the strength of the second connecting portion (43).

9. The battery cell according to claim 8, characterized in that, The thickness of the bent portion (42) is less than the thickness of the first connecting portion (41) and less than the thickness of the second connecting portion (43); And / or, the width of the bent portion (42) is smaller than the width of the first connecting portion (41) and smaller than the width of the second connecting portion (43); And / or, the bending portion (42) includes a base connecting the first connecting portion (41) and the second connecting portion (43), the base being provided with through holes and / or grooves.

10. An electrical appliance, characterized in that, Includes the battery cell as described in any one of claims 1 to 9.

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