Battery and electric equipment

Abstract

The utility model provides a battery and electric equipment, and relates to the technical field of batteries. The battery provided by the utility model comprises a shell and a battery cell, wherein the shell is provided with an accommodating cavity; the battery cell is contained in the containing cavity and comprises a first current collector, the first current collector comprises a first contact part located on the outermost layer of the battery cell, the first contact part is provided with a plurality of first holes, each first hole extends to the outer side surface of the first contact part, and the outer side surface of the first contact part can make contact with the inner wall face of the containing cavity. The electric equipment provided by the utility model comprises the battery. The battery and the electric equipment provided by the embodiment of the utility model have stronger anti-falling performance.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to batteries and electrical equipment. Background Technology

[0002] In related technologies, during drop tests, there is insufficient friction between the outer surface of the battery cell and the inner wall of the battery casing. The battery cell is prone to sliding relative to the casing, causing the edge of the battery cell in the direction perpendicular to the relative motion to easily collide with the casing and fail, resulting in low drop resistance. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a battery with enhanced drop resistance.

[0004] This utility model also proposes an electrical device having the above-mentioned battery.

[0005] The battery according to a first aspect embodiment of the present invention includes:

[0006] The shell has a receiving cavity;

[0007] A battery cell, housed in the receiving cavity, includes a first current collector, the first current collector including a first contact portion located on the outermost layer of the battery cell, the first contact portion having a plurality of first holes, each of the first holes extending to the outer surface of the first contact portion, the outer surface of the first contact portion being able to contact the inner wall surface of the receiving cavity.

[0008] The battery according to the present invention has at least the following beneficial effects: the outer surface of the first contact portion having a plurality of first holes can provide greater friction when it contacts the inner wall surface of the receiving cavity, thereby reducing the relative sliding between the casing and the cell, reducing the possibility of the edge of the cell in the direction perpendicular to the relative movement colliding with the casing, and reducing the risk of battery short circuit failure.

[0009] According to some embodiments of the present invention, the outer surface of the first contact portion has a first region and a second region arranged at intervals, the first region is provided with the first hole, and the first region can contact the inner wall surface of the receiving cavity; the battery further includes an adhesive layer, and the inner wall surface of the receiving cavity is bonded to the second region through the adhesive layer.

[0010] According to some embodiments of the present invention, the second region is provided with the first hole, and a portion of the adhesive layer is bonded to the inner wall of the first hole located in the second region.

[0011] According to some embodiments of the present invention, the battery cell is a wound structure and has a set width. The first current collector further includes a straight area and a bent area arranged along the width direction of the battery cell. The first hole is located in the straight area.

[0012] According to some embodiments of the present invention, the battery cell has a stacked structure and a set stacking direction. The battery cell further includes a second current collector, the second current collector includes a second contact portion, the second contact portion is located on the outermost layer of the battery cell and is located on the side away from the first contact portion in the stacking direction; the second contact portion has a plurality of second holes, each second hole extending to the outer surface of the second contact portion, and the outer surface of the second contact portion can contact the inner wall surface of the receiving cavity.

[0013] According to some embodiments of the present invention, each of the first holes further extends along a first direction, which is parallel to the outer surface of the first contact portion.

[0014] According to some embodiments of the present invention, the spacing between different first holes is at least 1 mm.

[0015] According to some embodiments of the present invention, the depth of the first hole is less than or equal to 0.5 times the thickness of the first contact portion.

[0016] According to some embodiments of the present invention, the housing is encapsulated by an aluminum-plastic film.

[0017] The electrical device according to a second aspect of the present invention includes a battery as described in any of the above embodiments.

[0018] The electrical equipment according to the embodiments of the present invention has at least the following beneficial effects: the battery casing and the battery cell of any of the above embodiments are less likely to slip relative to each other, and the edge of the battery cell in the direction perpendicular to the relative movement is less likely to collide with the casing. Therefore, the battery is less likely to fail in the event of a sudden drop, which can effectively enhance the reliability and stability of the electrical equipment.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0021] Figure 1 This is a schematic diagram of a battery according to some embodiments of the first aspect of this utility model;

[0022] Figure 2for Figure 1 The cross-sectional view shown in AA;

[0023] Figure 3 for Figure 2 A schematic diagram showing the removal of the casing.

[0024] Figure 4 for Figure 1 A schematic diagram of a battery cell;

[0025] Figure 5 This is a schematic diagram of a battery cell according to some embodiments of the second aspect of this utility model;

[0026] Figure 6 This is a schematic diagram of a battery cell according to some embodiments of the third aspect of this utility model;

[0027] Figure 7 This is a schematic diagram of a battery cell according to some embodiments of the fourth aspect of this utility model;

[0028] Figure 8 This is a cross-sectional view of the first current collector according to some embodiments of the fifth aspect of this utility model;

[0029] Figure 9 This is a cross-sectional view of the first current collector according to some embodiments of the sixth aspect of this utility model;

[0030] Figure 10 This is a cross-sectional view of the first current collector according to some embodiments of the seventh aspect of this utility model;

[0031] Figure 11 This is a side view schematic diagram of a battery cell according to some embodiments of the eighth aspect of this utility model;

[0032] Figure 12 for Figure 11 A schematic diagram of the cell viewed from another direction.

[0033] Figure label:

[0034] Battery 10;

[0035] Shell 100, receiving cavity 110;

[0036] Battery cell 200, first current collector 210, first contact portion 211, first hole 2111, first region 2112, second region 2113, straight region 212, bending region 213, second current collector 220, second contact portion 221, second hole 2211;

[0037] Adhesive layer 300. Detailed Implementation

[0038] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0039] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0040] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0041] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0042] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0043] Please refer to Figures 1 to 12 As shown, this utility model proposes a battery 10, which includes a casing 100 and a battery cell 200.

[0044] Please refer to Figures 1 to 3 As shown, where Figure 2The diagram shows the structure of the battery cell 200 and the housing 100 in some embodiments of the present invention. The housing 100 has a receiving cavity 110 in which the battery cell 200 is housed. The housing 100 can isolate the battery cell 200 from direct contact with external devices through its own structure, thereby protecting the battery cell 200.

[0045] Without departing from the inventive concept of this utility model, the housing 100 of this utility model can be a steel shell structure, or it can be composed of a part of an existing mobile phone mid-frame. As a preferred embodiment, in some embodiments, the housing 100 is encapsulated with an aluminum-plastic film. The aluminum-plastic film encapsulating the housing 100 has a lighter weight, which can significantly reduce the weight of the housing 100, thereby reducing the overall weight of the battery 10. The aluminum-plastic film also has good heat-sealing properties, which can automatically seal when the battery 10 overheats, preventing further damage to the battery 10.

[0046] Please refer to Figures 1 to 4 As shown, the battery cell 200 of this utility model also includes a first current collector 210, which includes a first contact portion 211 located on the outermost layer of the battery cell 200. The first contact portion 211 located on the outermost layer of the battery cell 200 can block the contact between the active material and the casing 100, thereby preventing a short circuit in the battery 10.

[0047] Please refer to Figure 4 As shown, the first contact portion 211 of this invention has a plurality of first holes 2111, each of which extends to the outer surface of the first contact portion 211. The outer surface of the first contact portion 211 can contact the inner wall surface of the receiving cavity 110. It should be noted that the "outer surface of the first contact portion 211" referred to in this invention refers to the surface of the first contact portion 211 located on the side away from other electrodes in its own thickness direction.

[0048] Since the multiple first holes 2111 of this utility model extend to the outer surface of the first contact portion 211, the roughness of the outer surface of the first contact portion 211, which is used to contact the inner wall surface of the housing 100, is increased. The coefficient of friction between the outer surface of the first contact portion 211 and the inner wall surface of the housing 100 is also increased. Therefore, when the outer surface of the first contact portion 211 contacts the inner wall surface of the housing 100, the inner wall surface of the housing 100 can provide the first contact portion 211 with a greater frictional force to resist relative movement. This can reduce the relative sliding between the housing 100 and the battery cell 200 and reduce the possibility of the edge of the battery cell 200 colliding with the housing 100 in the direction perpendicular to the relative movement.

[0049] When the edge of the cell 200 collides with the casing 100 in the direction perpendicular to the relative motion, the internal structure of the cell 200 may change, leading to a short circuit failure of the battery 10. In the prior art, when the edge of the cell collides with the casing, the electrode or separator is easily folded, causing a direct short circuit between active materials of different polarities, resulting in battery failure. This invention reduces the possibility of the edge of the cell 200 colliding with the casing 100 in the direction perpendicular to the relative motion by increasing the friction between the inner wall of the casing 100 and the first contact portion 211, thereby reducing the risk of short circuit failure of the battery 10.

[0050] On the other hand, the first hole 2111 can store a portion of the electrolyte in the battery 10, thereby reducing the amount of electrolyte accumulated near the edge of the cell 200. When the cell 200 is still in relative motion with respect to the casing 100, the impact of less electrolyte near the edge of the cell 200 on the edge of the cell 200 will be smaller, thereby reducing the risk of short circuit between active materials of different polarities and reducing the risk of short circuit failure of the battery 10.

[0051] Without departing from the inventive concept of this utility model, this utility model does not limit the type of battery cell 200.

[0052] Please refer to Figures 1 to 4 As shown, where Figure 4 This is a schematic diagram of a battery cell 200 with a wound structure. In some embodiments, the battery cell 200 has a wound structure. The first contact portion 211 surrounds the tabs and other electrode sheets of the battery cell 200 along the winding direction of the battery cell 200. The side of the first contact portion 211 away from the winding axis of the battery cell 200 is the outer surface of the first contact portion 211. The first hole 2111 extending to the outer surface of the first contact portion 211 can increase the roughness of the outer surface of the first contact portion 211, thereby reducing the possibility of the edge of the battery cell 200 perpendicular to the direction of relative movement colliding with the housing 100, and reducing the risk of short circuit failure of the battery 10. It should be noted that the above embodiments also include a battery cell 200 with a circular wound structure.

[0053] Based on the above plan, please refer to the following further information. Figure 3As shown, in some embodiments, the battery cell 200 has a predetermined width, and the first current collector 210 further includes a straight region 212 and a bent region 213 arranged along the width direction of the battery cell 200. A first hole 2111 is located within the straight region 212. Compared to the portion located in the bent region 213, the surface of the portion of the first current collector 210 located in the straight region 212 is flatter in its thickness direction. Consequently, the outer surface of the first contact portion 211 located in the straight region 212 is also flatter, resulting in a larger contact area with the inner wall of the housing 100. This allows the inner wall of the housing 100 to provide a greater frictional force to the first contact portion 211, thus reducing the relative sliding between the housing 100 and the battery cell 200 and reducing the possibility of collision between the edge of the battery cell 200 in the direction perpendicular to the relative movement and the housing 100. Without departing from the inventive concept of this utility model, the first hole 2111 can be provided in the bending area 213 based on the above embodiments, thereby increasing the roughness of the outer surface of the first contact portion 211.

[0054] As mentioned above, the casing 100 of the battery 10 can be encapsulated by an aluminum-plastic film. In some embodiments, in conjunction with the above scheme, the casing 100 encapsulated by the aluminum-plastic film is more likely to wrap the wound battery cell 200, thereby further increasing the contact area between the inner surface of the casing 100 and the outer surface of the first contact portion 211, which is beneficial to increasing the friction between the casing 100 and the battery cell 200.

[0055] Please refer to Figure 11 , Figure 12 As shown, where Figure 12 This is a schematic diagram of a battery cell 200 with a stacked structure viewed in the stacking direction. In some embodiments, the battery cell 200 has a stacked structure and a predetermined stacking direction. Multiple electrodes of the battery cell 200 are stacked along the stacking direction of the battery cell 200. The first contact portion 211 is located on one side of the stacking direction of the battery cell 200. The side of the first contact portion 211 that is away from other electrodes in the stacking direction is the outer surface of the first contact portion 211. The first hole 2111 extending to the outer surface of the first contact portion 211 can increase the roughness of the outer surface of the first contact portion 211, thereby reducing the possibility of the edge of the battery cell 200 perpendicular to the direction of relative movement colliding with the housing 100, and reducing the risk of short-circuit failure of the battery 10.

[0056] Based on the above plan, please refer to the following further information. Figure 11 , Figure 12As shown, in some embodiments, the battery cell 200 further includes a second current collector 220, which includes a second contact portion 221. The second contact portion 221 is located on the outermost layer of the battery cell 200 and is positioned away from the first contact portion 211 in the stacking direction. The second contact portion 221 has a plurality of second holes 2211, each of which extends to the outer surface of the second contact portion 221. The outer surface of the second contact portion 221 can contact the inner wall surface of the receiving cavity 110. The second contact portion 221 located on the outermost layer of the battery cell 200 can also block the contact between the active material and the casing 100, thereby preventing a short circuit in the battery 10.

[0057] For ease of understanding by those skilled in the art, the "outer surface of the second contact portion 221" referred to in this invention means the surface of the second contact portion 221 located on the side away from other electrode sheets in its thickness direction. In the above embodiment, the second contact portion 221 is located on the side away from the first contact portion 211 in the stacking direction of the cell 200, and the side of the second contact portion 221 away from the first contact portion 211 in the stacking direction is the outer surface of the second contact portion 221. The second hole 2211 extending to the outer surface of the second contact portion 221 can increase the roughness of the outer surface of the second contact portion 221, further reducing the possibility of the edge of the cell 200 perpendicular to the direction of relative movement colliding with the casing 100, and reducing the risk of short circuit failure of the battery 10.

[0058] Further, please refer to Figure 4 , Figure 5 As shown, in some embodiments, the outer surface of the first contact portion 211 has a first region 2112 and a second region 2113 arranged at intervals. The first region 2112 is provided with a first hole 2111, and the first region 2112 can contact the inner wall surface of the receiving cavity 110. The battery 10 also includes an adhesive layer 300, and the inner wall surface of the receiving cavity 110 is bonded to the second region 2113 through the adhesive layer 300. With the above solution, the surface roughness of the first region 2112 with the first hole 2111 on the first contact portion 211 is greater. Therefore, the housing 100, which can contact the surface of the first region 2112, can provide greater friction for the cell 200. It can also bond the cell 200 as a whole to the housing 100 through the adhesive layer 300, further reducing the possibility of relative movement between the cell 200 and the housing 100, reducing the possibility of collision between the edge of the cell 200 and the housing 100, and reducing the risk of short circuit failure of the battery 10.

[0059] It should be noted that those skilled in the art can set multiple second regions 2113 according to actual needs, and set multiple adhesive layers 300 to be bonded to different second regions 2113 respectively.

[0060] Further, please refer to Figure 4 As shown, in some embodiments, the second region 2113 is provided with a first hole 2111, and a portion of the adhesive layer 300 is bonded to the inner wall of the first hole 2111 located in the second region 2113. With the adhesive layer 300 already bonded to the surface of the second region 2113, bonding a portion of the adhesive layer 300 to the inner wall of the first hole 2111 further increases the bonding area between the adhesive layer 300 and the first contact portion 211, thereby increasing the bonding effect between the housing 100 and the battery cell 200. On the other hand, the adhesive layer 300 extending into the first hole 2111 can also restrict the movement of the first contact portion 211 perpendicular to the extension direction of the first hole 2111, thereby restricting the relative movement between the battery cell 200 and the housing 100 and reducing the possibility of the edge of the battery cell 200 colliding with the housing 100.

[0061] Without departing from the inventive concept of this utility model, those skilled in the art can adjust the shape of the first hole 2111 themselves.

[0062] Furthermore, in some embodiments, each first hole 2111 also extends along a first direction, which is parallel to the outer surface of the first contact portion 211. With the above approach, the first holes 2111 extending in the same direction are easier to process by laser etching, which helps to reduce processing costs. In some embodiments, please refer to... Figure 6 , Figure 7 As shown, where Figure 6 , Figure 7 The diagram shows the length direction of the battery cell 200. The outer surface of the first contact portion 211 is parallel to the length direction of the battery cell 200, and the extension direction of the first hole 2111 is parallel to the length direction of the battery cell 200. That is, the first direction is parallel to the outer surface of the first contact portion 211.

[0063] In some embodiments, please refer to Figure 6 As shown, multiple first holes 2111 are uniformly arranged along the length of the cell 200. In some embodiments, please refer to... Figure 7 As shown, there is only one first hole 2111 in the length direction of the cell 200.

[0064] Further, please refer to Figure 4 As shown, where Figure 4 The spacing D between different first holes 2111 is shown. In some embodiments, the spacing D between different first holes 2111 is at least 1 mm. The above solution can increase the mass of the first current collector 210 by increasing the friction between the housing 100 and the first contact portion 211, thereby ensuring the flow capacity and strength of the first current collector 210. In some embodiments, the spacing D is preferably 2 mm to 5 mm.

[0065] Without departing from the inventive concept of this utility model, those skilled in the art can adjust the depth of the first hole 2111.

[0066] As a preferred embodiment, please refer to Figure 8 As shown, where Figure 8 The hole depth H1 of the first hole 2111 and the thickness H2 of the first contact portion 211 are shown. The hole depth H1 of the first hole 2111 is less than or equal to 0.5 times the thickness H2 of the first contact portion 211. The above solution can increase the mass of the first current collector 210 while increasing the friction between the housing 100 and the first contact portion 211, thereby ensuring the flow capacity and strength of the first current collector 210.

[0067] Without departing from the inventive concept of this utility model, those skilled in the art can adjust the shape of the first hole 2111. The shape of the first hole 2111 can be found in [reference needed]. Figures 8 to 10 As shown, where Figures 8 to 10 All show cross-sections parallel to the thickness direction of the current collector, where Figure 8 The cross-sectional profile of the first hole 2111 is triangular. Figure 9 The cross-sectional profile of the first hole 2111 is rectangular. Figure 10 The cross-sectional profile of the first hole 2111 is trapezoidal. According to... Figures 8 to 10 The shape of the first hole 2111 is not limited to a cone, cylinder, frustum, etc.

[0068] To facilitate further understanding by those skilled in the art, the technical effects of this utility model are further illustrated below through comparative tests.

[0069] Example:

[0070] The battery cell 200 adopts a wound water-based diaphragm system. The battery cell 200 is 5.353mm thick, 64.17mm wide, and 72.09mm long.

[0071] After the electrode sheets of the battery cell 200 are rolled, multiple first holes 2111 are laser-etched into the first contact portion 211. Please refer to [reference needed]. Figure 10 As shown, the first hole 2111 has a trapezoidal shape, with an upper diameter of 10μm, a lower diameter of 5μm, and a depth of 4μm (the total thickness of the first contact part 211 is 12μm). The spacing D between different first holes 2111 is 3mm.

[0072] The battery 10 in the above embodiment was tested according to the following steps:

[0073] Before testing, fully charge the 200 battery cell and let it sit for 2 hours.

[0074] Perform a drop test as follows: drop 3 times from each of the 6 sides, for a total of 18 drops; height 1m.

[0075] Drop sequence: with the clamp back cover facing the back and the camera facing the top, distinguish left from right when facing the top of the pod. Drop in the following order: front / back / top / bottom / left / right, 3 drops per side; 18 drops in total.

[0076] After the drop test, inspect the appearance.

[0077] Perform a drop test as follows: drop 3 times from each of the 6 sides, for a total of 18 drops; height 1.25m.

[0078] Drop sequence: with the clamp back cover facing the back and the camera facing the top, distinguish left from right when facing the top of the pod. Drop in the following order: front / back / top / bottom / left / right, 3 drops per side; 18 drops in total.

[0079] After the drop test, inspect the appearance.

[0080] Perform a drop test as follows: drop 3 times from each of the 6 sides, for a total of 18 drops; height 1.5m.

[0081] Drop sequence: with the clamp back cover facing the back and the camera facing the top, distinguish left from right when facing the top of the pod. Drop in the following order: front / back / top / bottom / left / right, 3 drops per side; 18 drops in total.

[0082] After the drop test, inspect the appearance.

[0083] Comparative example:

[0084] The difference from the embodiment is that the comparative example does not perform any treatment on the surface of the first contact portion 211.

[0085] Table 1 Test results of embodiments of this utility model

[0086]

[0087] Table 2 Test results of the comparative examples of this utility model

[0088]

[0089] Combining Tables 1 and 2, it can be seen that the comparative example cell 200 caught fire and emitted smoke during the drop test, while the 10 cells 200 of the present invention did not emit smoke or catch fire after the drop test. This indicates that the present invention's embodiment has a smaller range of movement of the cells 200 during the drop test. The first hole 2111 provided on the outer surface of the first contact portion 211 can effectively slow down the movement of the battery 10 within the cell 200 during the drop test, thereby reducing the risk of short circuit failure of the battery 10.

[0090] This utility model also proposes an electrical device, which includes a battery 10 as described in any of the above embodiments. In any of the above embodiments, the casing 100 and the battery cell 200 of the battery 10 are less prone to relative slippage, and the edge of the battery cell 200 in the direction perpendicular to the relative movement is less likely to collide with the casing 100. Therefore, the battery 10 is less likely to fail in the event of a sudden drop, effectively enhancing the reliability and stability of the electrical device.

[0091] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A battery, characterized in that, include: The shell has a receiving cavity; A battery cell, housed in the receiving cavity, includes a first current collector, the first current collector including a first contact portion located on the outermost layer of the battery cell, the first contact portion having a plurality of first holes, each of the first holes extending to the outer surface of the first contact portion, the outer surface of the first contact portion being able to contact the inner wall surface of the receiving cavity.

2. The battery according to claim 1, characterized in that, The outer surface of the first contact portion has a first region and a second region arranged at intervals. The first region is provided with the first hole and can contact the inner wall surface of the receiving cavity. The battery also includes an adhesive layer, and the inner wall surface of the receiving cavity is bonded to the second region through the adhesive layer.

3. The battery according to claim 2, characterized in that, The second region is provided with the first hole, and part of the adhesive layer is bonded to the inner wall of the first hole located in the second region.

4. The battery according to claim 1, characterized in that, The battery cell has a wound structure and a set width. The first current collector also includes a straight area and a bent area arranged along the width direction of the battery cell. The first hole is located in the straight area.

5. The battery according to claim 1, characterized in that, The battery cell has a stacked structure and a set stacking direction. The battery cell also includes a second current collector, which includes a second contact portion. The second contact portion is located on the outermost layer of the battery cell and is located on the side away from the first contact portion in the stacking direction. The second contact portion has a plurality of second holes, each of which extends to the outer surface of the second contact portion. The outer surface of the second contact portion can contact the inner wall surface of the receiving cavity.

6. The battery according to claim 1, characterized in that, Each of the first holes also extends along a first direction, which is parallel to the outer surface of the first contact portion.

7. The battery according to claim 1, characterized in that, The spacing between different first holes is at least 1 mm.

8. The battery according to claim 1, characterized in that, The depth of the first hole is less than or equal to 0.5 times the thickness of the first contact portion.

9. The battery according to claim 1 or 2, characterized in that, The housing is encapsulated in an aluminum-plastic film.

10. Electrical equipment, characterized in that, Includes the battery as described in any one of claims 1 to 9.

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