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 and riveted to the top cover, such that the circumferential edge of the pressure relief component is folded towards the top cover to form a flanged portion surrounding the circumferential edge of the top cover; the outer edge of the end of the top cover facing the pressure relief component is provided with a chamfer, and after the top cover and the pressure relief component are riveted together, the pressure relief component has a beveled surface that can fit into the chamfer. This utility model directly assembles the pressure relief component and the top cover by riveting, thus eliminating the need to bend the pressure relief component before assembly, avoiding secondary processing, saving processes, reducing processing difficulty and production costs, improving production efficiency, reducing stress concentration, facilitating riveting, improving the bonding force between the pressure relief component and the top cover after riveting, which is beneficial to improving sealing performance, thereby improving the production yield of the battery.

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. A cylindrical lithium battery consists of a casing, cap, electrode assembly, and electrolyte. The cap includes a top cover, perforated plate, insulating ring, sealing ring, and explosion-proof valve. Before assembly, the explosion-proof valve needs to be pre-bent at a right angle, which adds an extra step. Furthermore, insufficient connection strength between the explosion-proof valve and the top cover affects the sealing effect of the cap, thus impacting battery production yield and efficiency. 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 problems of the explosion-proof valve in the existing battery cap needing to be bent into a right angle before installation with the top cover, which increases the process, and the insufficient connection strength between the explosion-proof valve and the top cover easily affecting the sealing effect of the battery cap, thereby affecting the production yield and production efficiency of the battery.

[0004] The first aspect of this utility model provides a battery cap, comprising:

[0005] Top cover;

[0006] A pressure relief component is disposed on the side of the top cover facing the inside of the battery and is riveted to the top cover, such that the circumferential edge of the pressure relief component is folded towards the top cover and forms a flange portion surrounding the circumferential edge of the top cover.

[0007] The outer edge of the top cover facing the pressure relief component is chamfered. After the top cover is riveted to the pressure relief component, the pressure relief component has a beveled surface that can fit with the chamfer.

[0008] Preferably, the thickness of the top cover in the axial direction of the battery cap is w1, where w1 ≥ 0.5 mm.

[0009] Preferably, the flange does not extend beyond the surface of the top cover facing the outside of the battery.

[0010] Preferably, in the axial direction of the battery cap, the distance between the end of the flange facing the outside of the battery and the end of the top cover facing the outside of the cell is w2, where w2 ≥ 0.1 mm.

[0011] Preferably, the width of the flange portion in the radial direction of the battery cap is w3, where w3 ≥ 0.2 mm.

[0012] Preferably, the chamfer is formed as a 45° chamfer with a right-angle side size of w4, where w4 ≥ 0.15 mm.

[0013] Preferably, on the side facing the outside of the battery, the top cover is spot-welded to the flange to form a welded part.

[0014] Preferably, it further includes:

[0015] The sealing element is formed as an annular structure and is fitted onto the circumferential sidewall of the pressure relief element; in the radial direction of the battery cap, the distance between the inner annular wall of the sealing element and the flange is G, where G≥0.15mm.

[0016] Preferably, it further includes:

[0017] A connector is disposed on the side of the pressure relief component facing the inside of the battery and is welded to the pressure relief component;

[0018] An insulating component is formed as an annular structure sandwiched between the connector and the pressure relief component, wherein the welded connection between the pressure relief component and the connector is located within the annular structure.

[0019] The second aspect of this utility model provides a battery, including the battery cap described in any of the above technical solutions.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] The battery cap of this utility model has a pressure relief component located on the side of the top cover facing the inside of the battery and riveted to the top cover. This causes the circumferential edge of the pressure relief component to fold towards the top cover, forming a flanged portion surrounding the circumferential edge of the top cover. In this way, the pressure relief component and the top cover are directly assembled by riveting, eliminating the need to bend the pressure relief component before assembly, avoiding secondary processing, saving processes, reducing processing difficulty and production costs, and improving production efficiency. The outer edge of the end of the top cover facing the pressure relief component is provided with a chamfer. After the top cover and the pressure relief component are riveted together, a beveled surface is formed on the pressure relief component that can fit with the chamfer, reducing stress concentration, facilitating riveting, and improving the bonding force between the pressure relief component and the top cover after riveting, which is beneficial to improving sealing performance and thus improving the production yield of the battery.

[0022] 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

[0023] 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.

[0024] Figure 1 This is a schematic diagram of the structure of the battery cap provided in an embodiment of the present utility model;

[0025] Figure 2 An axial sectional view of the battery cap provided in an embodiment of this utility model;

[0026] Figure 3 for Figure 2 Enlarged structural diagram at point A;

[0027] Figure 4 This is a structural schematic diagram of the battery cap provided in an embodiment of the present invention from another perspective.

[0028] Icons: 10-Top cover; 11-Chamfer; 20-Pressure relief component; 21-Flanged edge; 22-Beveled surface; 30-Welded part; 40-Seal; 50-Connector; 60-Insulation component. Detailed Implementation

[0029] 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.

[0030] 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.

[0031] 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.

[0032] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] According to a first aspect of the present invention, a battery cap is provided, which includes a top cover 10 and a pressure relief component 20.

[0039] The specific structure of the battery cap according to this embodiment, as described above, will be described below.

[0040] In this embodiment, as Figure 1 and Figure 2 As shown, the top cover 10 is formed as a plate structure, such as a circular plate structure, with a stamped boss protruding outwards from the middle position. A through hole is opened on the side wall of the stamped boss to release air when the battery is thermally runaway. The pressure relief component 20 is connected to the top cover 10 and closes the through hole on the stamped boss. The pressure relief component 20 can be an explosion-proof valve or an explosion-proof plate, which is used to open when the battery is thermally runaway to connect the inside and outside of the battery, so as to ensure the safety of the battery by releasing pressure.

[0041] Specifically, such as Figure 2 As shown, the pressure relief component 20 is disposed on the side of the top cover 10 facing the inside of the battery and is riveted to the top cover 10, such that the circumferential edge of the pressure relief component 20 is folded towards the top cover 10 to form a flange 21 surrounding the circumferential edge of the top cover 10. The flange 21 is formed into an annular structure covering the entire circumference of the top cover 10. In this way, the pressure relief component 20 and the top cover 10 are directly assembled by riveting, so that the pressure relief component 20 does not need to be bent before assembly, avoiding secondary processing, saving processes, reducing processing difficulty and production costs, and improving production efficiency.

[0042] like Figure 2As shown, the outer edge of the top cover 10 facing the pressure relief component 20 is provided with a chamfer 11. After the top cover 10 and the pressure relief component 20 are riveted together, the pressure relief component 20 has a beveled part 22 that can fit with the chamfer 11. The beveled part 22 is formed into a funnel-shaped ring structure, which can reduce stress concentration during the riveting process, facilitate riveting and forming, and improve the bonding force between the pressure relief component 20 and the top cover 10 after riveting, which is beneficial to improving the sealing performance and thus improving the production yield of the battery.

[0043] like Figure 2 and Figure 3 As shown, along the axial direction of the battery cap (i.e. Figure 2 (Vertical direction from the viewing angle) The thickness of the top cover 10 is w1, w1≥0.5mm, thereby ensuring the sealing and structural strength of the top cover 10.

[0044] like Figure 2 and Figure 3 As shown, the flange 21 does not extend beyond the surface of the top cover 10 facing the outside of the battery. This avoids interference between the seal 40 and the pressure relief member 20 after the seal 40 is folded and abuts against the surface of the top cover 10 facing the outside of the battery, thus preventing damage to the seal 40 and affecting its sealing performance.

[0045] After being folded, the seal 40 can form a seal between the flange 21 and the top cover 10, and further, as... Figure 2 and Figure 3 As shown, in the axial direction of the battery cap, the distance between the end of the flange 21 facing the outside of the battery and the end of the top cover 10 facing the outside of the cell is w2, w2≥0.1mm, thereby ensuring that after the pressure relief component 20 forms the flange 21 by riveting, a space for the sealing component 40 to be compressed is formed above the flange 21, thereby improving the sealing effect of the battery cap.

[0046] In this implementation, such as Figure 1 As shown, on the side facing the outside of the battery, the top cover 10 is spot-welded to the flange 21 to form a welded portion 30. This further enhances the connection strength between the cover and the pressure relief component 20 after riveting. Spot welding improves processing efficiency and minimizes the heat-affected zone of the battery cap, reducing the risk of deformation of the battery cap due to welding. Preferably, multiple welded portions 30 are provided, and the multiple welded portions 30 are equally spaced around the flange 21.

[0047] In this embodiment, as Figure 2 and Figure 3 As shown, in the radial direction of the battery cap (i.e. Figure 2 (Horizontal direction from the viewing angle), the width of the flange 21 is w3, w3≥0.2mm, thus ensuring the connection strength between the pressure relief part 20 and the top cover 10 after riveting.

[0048] Preferably, such as Figure 2 and Figure 3 As shown, the chamfer 11 is formed as a 45° chamfer 11 with a right angle side size of w4, where w4 ≥ 0.15 mm, thereby reducing the risk of failure in riveting the pressure relief component 20 and the top cover 10 and the processing difficulty, thereby improving the connection strength between the pressure relief component 20 and the top cover 10 after riveting.

[0049] Furthermore, in this embodiment, such as Figure 1 , Figure 2 and Figure 4 As shown, the battery cap also includes a sealing element 40, which is formed into an elastic annular structure. The sealing element 40 is sleeved on the circumferential sidewall of the pressure relief element 20, and both ends of the sealing element 40 extend out of the surface of the top cover 10 facing the outside of the battery and the surface of the pressure relief element 20 facing the inside of the battery. After the battery cap and the battery housing are assembled, through processes such as rolling and folding, at least part of the sealing element 40 is compressed and sandwiched between the battery housing and the top cover 10 and / or between the battery housing and the pressure relief element 20. In the radial direction of the battery cap, the distance between the inner annular wall of the sealing element 40 and the flange 21 is G, where G≥0.15mm, so that the flange 21 formed after the pressure relief element 20 is riveted has sufficient space to avoid damage to the sealing element 40.

[0050] In this embodiment, as Figure 2 and Figure 4 As shown, the battery cap also includes a connector 50 and an insulator 60. The connector 50 is located on the side of the pressure relief component 20 facing the inside of the battery and is welded to the pressure relief component 20. The tabs on the electrode assembly inside the battery are welded to the side of the connector 50 facing the inside of the battery, thus realizing the transmission of electrical energy. It should be noted that when the battery experiences thermal runaway, the internal pressure of the battery increases. Under the action of pressure, the pressure relief component 20 is pushed outward and deformed until the connector 50 breaks, thus disconnecting the pressure relief component 20 from the tabs. This achieves power-off protection before the pressure relief component 20 is opened. Specifically, the connector 50 is formed as a plate structure and has a through hole that extends along its thickness, allowing the gas inside the battery to pass through the connector 50 and act on the pressure relief component 20. Under the action of gas pressure, the pressure relief component 20 deforms, causing the connector 50 to break.

[0051] like Figure 2As shown, the insulating component 60 is formed as an annular structure sandwiched between the connector 50 and the pressure relief component 20. The insulating component 60 can be made of plastic materials such as PP (polypropylene) or PPS (polyphenylene sulfide), and it can be heat-fused to the pressure relief component 20. The welded connection between the pressure relief component 20 and the connector 50 is located within the annular structure. In this way, after thermal runaway causes the connector 50 to break, while ensuring that the electrode tab is disconnected from the pressure relief component 20, the insulating component 60 can separate the part of the connector 50 connected to the electrode tab from the pressure relief component 20, thereby ensuring effective power disconnection and forming reliable safety protection.

[0052] Preferably, such as Figure 2 As shown, a portion of the insulating element 60 covers the circumferential sidewall of the connector 50 to form a snap-fit ​​connection with the connector 50, thereby improving the insulation protection effect.

[0053] According to the present invention, a pressure relief component is disposed on the side of the top cover facing the inside of the battery and is riveted to the top cover, such that the circumferential edge of the pressure relief component is folded towards the top cover to form a flanged portion surrounding the circumferential edge of the top cover. In this way, the pressure relief component and the top cover are directly assembled by riveting, thus eliminating the need to bend the pressure relief component before assembly, avoiding secondary processing, saving processes, reducing processing difficulty and production costs, and improving production efficiency. The outer edge of the end of the top cover facing the pressure relief component is provided with a chamfer. After the top cover and the pressure relief component are riveted together, a beveled surface is formed on the pressure relief component that can fit with the chamfer, reducing stress concentration, facilitating riveting, and improving the bonding force between the pressure relief component and the top cover after riveting, which is beneficial to improving the sealing performance and thus improving the production yield of the battery.

[0054] According to the present invention, a battery includes a battery cap as described above. The battery cap is installed on the battery casing and connected to the electrode tab inside the battery casing. The processing difficulty and cost of the battery cap are reduced, and the connection strength between the pressure relief component and the top cover is improved, thereby improving the production yield and production efficiency of the battery.

[0055] 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 in that, include: Top cover; A pressure relief component is disposed on the side of the top cover facing the inside of the battery and is riveted to the top cover, such that the circumferential edge of the pressure relief component is folded towards the top cover and forms a flange portion surrounding the circumferential edge of the top cover. The outer edge of the top cover facing the pressure relief component is chamfered. After the top cover is riveted to the pressure relief component, the pressure relief component has a beveled surface that fits into the chamfer.

2. The battery cap according to claim 1, characterized in that, Along the axial direction of the battery cap, the thickness of the top cover is w1, where w1 ≥ 0.5 mm.

3. The battery cap according to claim 1, characterized in that, The flange does not extend beyond the surface of the top cover facing the outside of the battery.

4. The battery cap according to claim 3, characterized in that, Along the axial direction of the battery cap, the distance between the end of the flange facing the outside of the battery and the end of the top cover facing the outside of the cell is w2, where w2 ≥ 0.1 mm.

5. The battery cap according to claim 1, characterized in that, In the radial direction of the battery cap, the width of the flange is w3, where w3 ≥ 0.2 mm.

6. The battery cap according to claim 1, characterized in that, The chamfer is formed as a 45° chamfer with a right-angle side size of w4, where w4 ≥ 0.15 mm.

7. The battery cap according to claim 1, characterized in that, On the side facing the outside of the battery, the top cover is spot-welded to the flange to form a welded section.

8. The battery cap according to claim 1, characterized in that, Also includes: The sealing element is formed as an annular structure and is fitted onto the circumferential sidewall of the pressure relief element; in the radial direction of the battery cap, the distance between the inner annular wall of the sealing element and the flange is G, where G≥0.15mm.

9. The battery cap according to claim 1, characterized in that, Also includes: A connector is disposed on the side of the pressure relief component facing the inside of the battery and is welded to the pressure relief component; An insulating component is formed as an annular structure sandwiched between the connector and the pressure relief component, wherein the welded connection between the pressure relief component and the connector is located within the annular structure.

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

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