Battery cap and battery

Abstract

This utility model relates to the field of battery technology, and in particular to a battery cap and a battery. The battery cap includes: a pressure relief component disposed on the side of the top cover facing the inside of the battery; a connecting component disposed on the side of the pressure relief component facing the inside of the battery; the connecting component includes a connecting portion that contacts the pressure relief component and a separating portion that is spaced apart from the pressure relief component in the axial direction of the battery; an insulating sealant covers the circumferential sidewalls of the top cover and the pressure relief component, and the end of the insulating sealant facing the inside of the battery in the axial direction of the battery is formed as a first support portion extending radially along the battery and extending between the pressure relief component and the connecting component. The insulating sealant in this utility model has the functions of sealing, insulating and supporting the pressure relief component and the connecting component, thereby saving process and positioning costs, improving assembly efficiency and production yield.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cap and a battery. Background Technology

[0002] Cylindrical lithium batteries are classified into lithium cobalt oxide, lithium manganese oxide, and ternary lithium batteries. Each of these three material systems has its own advantages and is widely used in digital devices, lighting fixtures, power tools, and portable mobile energy sources. Currently, small cylindrical batteries consist of a steel casing and a cap. The cap typically comprises a top cover, an explosion-proof valve, an insulating sheet, a perforated plate, and an outer sealing ring. The explosion-proof valve and the perforated plate are assembled using through welding, and the outer edges of the explosion-proof valve and the top cover are connected by spot welding. The entire cap is then sealed by compressing the sealing ring through the flange of the cylindrical casing. The insulating sheet, positioned between the perforated plate and the explosion-proof valve, primarily serves as insulation and support. Because the sealing ring and the insulating sheet are two independent components, they require two assembly processes, resulting in low production efficiency. In particular, the insulating sheet needs to be positioned during the process, leading to higher manufacturing costs. Utility Model Content

[0003] In view of this, the purpose of this application is to provide a battery cap and a battery to solve the problem that the assembly process of the sealing ring and insulating sheet in the existing cylindrical battery cap is complicated, resulting in low production efficiency and high process cost.

[0004] The first aspect of this utility model provides a battery cap, comprising: Top cover; A pressure relief component is provided on the side of the top cover facing the inside of the battery; A connector is disposed on the side of the pressure relief component facing the inside of the battery and is used to connect to the electrode tab; the connector includes a connecting part that contacts the pressure relief component and a separating part that is spaced apart from the pressure relief component in the axial direction of the battery. An insulating seal is provided, covering the circumferential sidewalls of the top cover and the pressure relief member. The end of the insulating seal facing the inside of the battery in the axial direction is formed as a first support portion extending radially along the battery and extending between the pressure relief member and the connector.

[0005] Preferably, in the axial direction of the battery, the thickness of the first support portion filling between the surface of the pressure relief member facing the inside of the battery and the surface of the connector facing the pressure relief member is g2, where 0.15mm≤g2≤0.20mm.

[0006] Preferably, the end of the first support portion facing the inside of the battery has a second support portion that protrudes along the axial direction of the battery, and the second support portion is in contact with an inwardly recessed groove on the housing. Preferably, the second support portion is formed as a ring structure, and the thickness between the inner ring wall and the outer ring wall of the second support portion is w2, where 0.5mm≤w2≤1.0mm. Preferably, in the radial direction of the battery, the distance between the end of the insulating seal facing the housing and the second support portion is w1, where 1.0mm≤w1≤1.2mm. Preferably, the battery cap is assembled to the housing, and the housing is pressed against a portion of the insulating seal, such that the end of the insulating seal facing outwards in the battery axial direction is formed as a sealing portion folded toward the battery axis and attached to the surface of the top cover facing outwards. Preferably, in the radial direction of the battery, there is a gap g1 between the first support and the housing, where 0.05mm≤g1≤0.09mm.

[0007] Preferably, the first support portion is formed as a ring structure, and the pressure relief component has a groove, with the first support portion arranged around the outside of the groove; Part of the first support portion covers the circumferential sidewall of the connector.

[0008] Preferably, the circumferential edge of the pressure relief member has a rim portion that protrudes toward the top cover and covers the circumferential sidewall of the top cover, and the insulating seal member is in contact with the rim portion.

[0009] The second aspect of this utility model provides a battery, including the battery cap described in any of the above technical solutions.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: The battery cap of this utility model has a pressure relief component disposed on the side of the top cover facing the inside of the battery; a connecting component disposed on the side of the pressure relief component facing the inside of the battery; the connecting component includes a connecting part that contacts the pressure relief component and a separating part that is spaced apart from the pressure relief component in the axial direction of the battery; an insulating sealant covers the circumferential sidewalls of the top cover and the pressure relief component, and the end of the insulating sealant facing the inside of the battery in the axial direction of the battery is formed as a first support part that extends radially along the battery and extends between the pressure relief component and the connecting component. In this way, the insulating sealant has both sealing function and insulation and support functions that separate the pressure relief component and the connecting component, thereby saving process and positioning costs, improving assembly efficiency and production yield.

[0011] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0012] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of the battery cap and housing after assembly, provided in an embodiment of the present utility model; Figure 2 A schematic diagram of the battery cap and housing after assembly, provided in an embodiment of the present utility model, from another perspective; Figure 3 A partial cross-sectional view of the assembly structure of the battery cap and housing provided in an embodiment of this utility model; Figure 4 for Figure 3 A magnified structural diagram of point A in the middle.

[0014] Icons: 10-Top cover; 20-Pressure relief component; 201-Edge wrapping; 21-Groove; 30-Connector; 301-Connecting part; 302-Separating part; 31-Connecting hole; 40-Insulating seal; 401-First support part; 402-Second support part; 403-Sealing part; 50-Housing shell; 51-Groove. Detailed Implementation

[0015] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0016] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0017] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0018] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0019] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0020] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations 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 relation terms used herein will be interpreted accordingly.

[0021] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0022] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0023] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0024] According to a first aspect of the present invention, a battery cap is provided, which includes a top cover 10, a pressure relief component 20, a connector 30, and an insulating sealing component 40.

[0025] The specific structure of the battery cap according to this embodiment, as described above, will be described below.

[0026] In this embodiment, as Figures 1 to 3 As shown, the pressure relief component 20 is located on the side of the top cover 10 facing the inside of the battery. It is used to open in the event of battery thermal runaway to connect the inside and outside of the battery, thereby ensuring the safety performance of the battery. The pressure relief component 20 can be an explosion-proof valve or an explosion-proof plate, etc. The main body of the top cover 10 is formed into a plate-like structure. A boss protruding outward from the battery is formed in the middle of the top cover 10. The boss can be formed by stamping. The circumferential sidewall of the boss is provided with through holes so that the pressure relief component 20 can communicate with the outside of the battery, so that the gas inside the battery can be discharged after the pressure relief component 20 is opened.

[0027] like Figure 3 As shown, the connector 30 is located on the side of the pressure relief component 20 facing the inside of the battery and is used to connect the electrode tab. The connector 30 is formed into a plate-like structure, and a through hole 31 extending along its thickness direction is provided on the connector 30, allowing gas inside the battery to pass through the through hole 31 and act on the pressure relief component 20. Specifically, the connector 30 is welded to the pressure relief component 20, and the electrode tab is installed on the side of the connector 30 facing the inside of the battery. The projection of the welding connection position of the pressure relief component 20 and the installation position of the electrode tab on the connector 30 does not coincide. Thus, before the pressure relief component 20 is opened, the pressure relief component 20 deforms, causing the connector 30 to crack, thereby breaking the connection between the pressure relief component 20 and the electrode tab, and achieving power-off protection before the pressure relief component 20 is opened.

[0028] Furthermore, in this embodiment, as Figure 3 and Figure 4 As shown, the connector 30 includes a connecting portion 301 that contacts the pressure relief member 20 and a partition portion 302 that is spaced apart from the pressure relief member 20 along the battery axis. The weld marks formed by welding the connector 30 and the pressure relief member 20 are provided on the connecting portion 301. The crack formed by the connector 30 cracking is located between the partition portion 302 and the connecting portion 301. Preferably, the partition portion 302 is formed into an annular structure, and the connecting portion 301 is located inside the annular structure of the partition portion 302.

[0029] like Figures 1 to 3 As shown, the insulating seal 40 can be an elastic sealing ring. The insulating seal 40 is formed as an annular structure covering the circumferential sidewalls of the top cover 10 and the pressure relief member 20, so as to play a sealing role after being assembled with the housing 50. The insulating seal 40 has a first support portion 401 formed at one end facing the inside of the battery along the axial direction of the battery, extending radially into the space between the pressure relief component 20 and the connector 30. This allows at least a portion of the first support portion 401 to fill the gap between the pressure relief component 20 and the separator 302. Thus, if the connector 30 cracks and the pressure relief component 20 and the tab are disconnected, the pressure relief component 20 and the separator 302 can be effectively insulated and separated, achieving reliable power-off protection. It also supports the connector 30, preventing short circuits caused by the connector 30 overlapping with the metal parts. This design allows the insulating seal 40 to have both sealing properties and the rigidity of the insulating seal 40 to support the space between the pressure relief component 20 and the connector 30. Furthermore, it provides insulation protection after the connector 30 cracks. Compared to the traditional cap structure that requires the sealing ring and insulating sheet to be assembled in stages, this design saves process and positioning costs, improves assembly efficiency and production yield.

[0030] Furthermore, in this embodiment, as Figure 3 As shown, the first support part 401 is formed into a ring structure, and the pressure relief part 20 is provided with a groove 21. When the pressure inside the battery reaches the opening pressure of the pressure relief part 20, the groove 21 breaks to achieve communication between the inside and outside of the battery. The first support part 401 is arranged around the outside of the groove 21, so as to ensure that the first support part 401 affects the exhaust area after the pressure relief part 20 is opened.

[0031] In this embodiment, as Figure 3 As shown, a portion of the first support portion 401 covers the circumferential sidewall of the connector 30, increasing the contact area between the first support portion 401 and the connector 30. The first support portion 401 is pressed against the connector 30, thereby improving the support effect of the first support portion 401.

[0032] In this embodiment, as Figure 3As shown, the circumferential edge of the pressure relief component 20 has a rim portion 201 that protrudes toward the top cover 10 and covers the circumferential sidewall of the top cover 10, thus achieving the assembly and positioning of the pressure relief component 20 and the top cover 10. After positioning, the pressure relief component 20 and the top cover 10 can be welded together. The welding position can be located between the rim portion 201 and the circumferential sidewall of the top cover 10. The insulating seal 40 contacts the rim portion 201, thereby achieving the sealing of the battery cap.

[0033] like Figures 1 to 3 As shown, the battery cap is assembled to the housing 50, and the housing 50 is pressed against a portion of the insulating seal 40, such that the end of the insulating seal 40 facing the outside of the battery axis is formed as a sealing portion 403 that is folded toward the battery axis and attached to the surface of the top cover 10 facing the outside of the battery.

[0034] Furthermore, such as Figure 3 As shown, in the radial direction of the battery (i.e. Figure 3 (Horizontal direction from the perspective) There is a gap g1 between the first support part 401 and the housing 50, 0.05mm≤g1≤0.09mm, so as to reserve space for the expansion of the insulating seal 40 and meet the sealing requirements after the insulating seal 40 is folded.

[0035] Furthermore, such as Figure 3 As described above, the end of the edge portion 201 facing the outside of the battery in the axial direction is located below the end of the top cover 10 facing the outside of the battery. This provides space for the insulating seal 40 to expand and deform after it is pressed and folded with the housing 50, thereby ensuring the sealing performance of the battery cap and housing 50 after assembly.

[0036] Preferably, in this embodiment, such as Figure 3 and Figure 4 As shown, along the axial direction of the battery (i.e. Figure 3 (Vertical direction from a viewing angle) The thickness of the first support portion 401 filling the space between the surface of the pressure relief component 20 facing the inside of the battery and the surface of the connector 30 facing the pressure relief component 20 is g2, 0.15mm≤g2≤0.20mm, to ensure the support strength of the first support portion 401 for the pressure relief component 20 and the connector 30. It should be noted that g2 is the minimum distance between the surface of the pressure relief component 20 facing the inside of the battery and the surface of the connector 30 facing the pressure relief component 20. By limiting the minimum distance, the parameter range of 0.15mm to 0.20mm ensures the reliability of the support strength.

[0037] In this embodiment, as Figure 3 and Figure 4As shown, a second support portion 402 protruding along the battery axial direction is formed at one end of the first support portion 401 facing the inside of the battery. The second support portion 402 contacts the inwardly recessed groove 51 on the housing 50, thus achieving axial positioning after the battery cap is assembled with the housing 50. It should be noted that, as Figure 1 and Figure 3 As shown, the groove 51 is an annular structure formed by rolling on the circumferential sidewall of the housing 50 after the battery is assembled.

[0038] Preferably, the second support portion 402 is formed into a ring structure, so that the second support portion 402 can make full-circumferential contact with the groove 51, thereby ensuring reliable support. The thickness dimension between the inner ring wall and the outer ring wall of the second support portion 402 is w2, 0.5mm≤w2≤1.0mm, thereby ensuring that the supporting function of the second support portion 402 meets the support requirements of each component in the battery cover.

[0039] Furthermore, in this embodiment, as Figure 3 and Figure 4 As shown, in the radial direction of the battery (i.e. Figure 3 (Horizontal direction from a viewing angle) The distance between the end of the insulating seal 40 facing the housing 50 and the second support 402 is w1, 1.0mm≤w1≤1.2mm, to ensure the strength of the battery cap overlapping in the housing 50. It should be noted that w1 is the minimum distance between the end of the insulating seal 40 facing the housing 50 and the second support 402, thus ensuring reliable strength.

[0040] It should be noted that in this embodiment, the housing 50 is cylindrical, and the battery cap is correspondingly formed into a cylindrical structure.

[0041] According to the present invention, a battery cap has a pressure relief component disposed on the side of the top cover facing the inside of the battery; a connecting component disposed on the side of the pressure relief component facing the inside of the battery; the connecting component includes a connecting portion that contacts the pressure relief component and a separating portion that is spaced apart from the pressure relief component in the axial direction of the battery; an insulating sealant covers the circumferential sidewalls of the top cover and the pressure relief component, and the end of the insulating sealant facing the inside of the battery in the axial direction of the battery is formed as a first support portion that extends radially along the battery and extends between the pressure relief component and the connecting component. This allows the insulating sealant to have both sealing properties and insulation and support functions for separating the pressure relief component and the connecting component, thereby saving process and positioning costs, improving assembly efficiency and production yield. According to the present invention, a battery includes a battery cap as described above. The battery cap is installed on the housing and connected to the electrode tab inside the housing. The integral molding of the insulating sealing component in the battery cap reduces the assembly difficulty and positioning cost of the battery cap, thereby improving the production yield and production efficiency of the battery.

[0042] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A battery cap, characterized by, include: Top cover; A pressure relief component is provided on the side of the top cover facing the inside of the battery; A connector is disposed on the side of the pressure relief component facing the inside of the battery and is used to connect to the electrode tab; the connector includes a connecting part that contacts the pressure relief component and a separating part that is spaced apart from the pressure relief component in the axial direction of the battery. An insulating seal is provided, covering the circumferential sidewalls of the top cover and the pressure relief member. The end of the insulating seal facing the inside of the battery in the axial direction is formed as a first support portion extending radially along the battery and extending between the pressure relief member and the connector.

2. The battery cap of claim 1, wherein, Along the axial direction of the battery, the thickness of the first support portion filling the space between the surface of the pressure relief member facing the inside of the battery and the surface of the connector facing the pressure relief member is g2, where 0.15mm≤g2≤0.20mm.

3. The battery cap of claim 1, wherein, The first support portion has a second support portion that protrudes along the axial direction of the battery at one end facing the inside of the battery, and the second support portion is in contact with an inwardly recessed groove on the housing.

4. The battery cap of claim 3, wherein, The second support is formed as a ring structure, and the thickness between the inner ring wall and the outer ring wall of the second support is w2, where 0.5mm≤w2≤1.0mm.

5. The battery cap of claim 3, wherein, In the radial direction of the battery, the distance between the end of the insulating seal facing the housing and the second support is w1, where 1.0mm≤w1≤1.2mm.

6. The battery cap of claim 1, wherein, The battery cap is assembled to the housing, and the housing is pressed against a portion of the insulating seal, such that the end of the insulating seal facing outwards in the battery axial direction is formed as a sealing portion that is folded towards the battery axis and attached to the surface of the top cover facing outwards.

7. The battery cap of claim 6, wherein, In the radial direction of the battery, there is a gap g1 between the first support and the housing, where 0.05mm≤g1≤0.09mm.

8. The battery cap of claim 1, wherein, The first support portion is formed into a ring structure, and the pressure relief component is provided with a groove. The first support portion is arranged around the outside of the groove. Part of the first support portion covers the circumferential sidewall of the connector.

9. The battery cap of claim 1, wherein, The pressure relief component has a circumferential edge that protrudes toward the top cover and covers the circumferential sidewall of the top cover, and the insulating seal is in contact with the circumferential edge.

10. A battery, characterized by Includes the battery cap as described in any one of claims 1 to 9.

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