Battery cap and battery

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cap and a battery. The pressure relief piece is arranged on one side, facing the interior of the battery, of the top cover; the connecting piece is connected with the tab and the pressure relief piece; the connecting piece is arranged on one side, far away from the top cover, of the pressure relief piece; the insulating part is clamped between the pressure relief part and the connecting part and comprises an insulating main body, a coating part and a flanging part, and the coating part is arranged on the circumferential edge of the insulating main body and protrudes in the direction away from the pressure relief part in the axial direction, so that the coating part is arranged on the circumferential side wall of the connecting part in a surrounding mode; and the flanging part is arranged on one side, far away from the insulating main body, of the coating part and protrudes towards the direction close to the connecting piece in the radial direction, so that the flanging part can be in contact with one side, far away from the pressure relief piece, of the connecting piece. According to the utility model, the connecting piece is supported through the flanging part, and the connecting piece is prevented from being separated from the pressure relief piece in advance under the pulling of the tab, so that the situation of power failure in advance is avoided, and the performance and the service life of the battery are ensured.

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 materials. Each of these three material systems has its own advantages. These batteries are widely used in digital devices, lighting fixtures, power tools, portable mobile energy sources, and other fields. A cylindrical lithium battery consists of a casing, cap, positive electrode, negative electrode, separator, and electrolyte. The cap includes a top cover, perforated plate, insulating ring, sealing ring, and explosion-proof sheet. During the process of increased internal pressure of the battery, the tabs exert a pulling effect on the perforated plate, causing the perforated plate to separate from the explosion-proof sheet prematurely. This can easily lead to premature power loss inside the battery, affecting battery performance and reducing battery life. 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 perforated plate in the existing battery cap is prone to premature separation from the explosion-proof sheet under the pulling action of the tabs, thereby causing premature power loss inside the battery, affecting battery performance and reducing battery life.

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

[0005] Top cover;

[0006] The pressure relief device is located on the side of the top cover facing the inside of the battery;

[0007] A connector, which connects to the pressure relief component and the electrode lug, is located on the side of the pressure relief component away from the top cover;

[0008] An insulating component is sandwiched between the pressure relief component and the connecting component. The insulating component includes an insulating body, a covering portion, and a flanged portion. The covering portion is disposed on the circumferential edge of the insulating body and protrudes axially away from the pressure relief component, such that the covering portion surrounds the circumferential sidewall of the connecting component. The flanged portion is disposed on the side of the covering portion away from the insulating body and protrudes radially towards the connecting component, such that the flanged portion can contact the side of the connecting component away from the pressure relief component.

[0009] Preferably, the flange is formed as a closed annular structure; the axial section of the flange is formed as two rectangular structures arranged opposite to each other along the axis of the flange, the radial lengths of the two rectangular structures are L1 and L2, respectively, in mm; the maximum radial dimension of the connector is L0, in mm; 10% ≤ (L1 + L2) / L0 ≤ 50%.

[0010] Preferably, in the thickness direction of the connector, the insulating member is interference-fitted with the connector.

[0011] Preferably, the side of the covering portion facing the connector has a protruding abutment portion.

[0012] Preferably, the top cover is welded to the circumferential edge region of the pressure relief component; the connecting component is welded to the central region of the pressure relief component.

[0013] Preferably, the pressure relief component has a first recessed portion protruding towards the connector, and the connector contacts the first recessed portion; the contact area between the connector and the first recessed portion is 5mm. 2 Up to 35mm 2 .

[0014] Preferably, the pressure relief component also has a second recessed portion protruding towards the direction of the connector, and the second recessed portion is provided with a recessed groove portion.

[0015] Preferably, the first recessed portion is disposed on the second recessed portion, such that the second recessed portion and the connecting member are spaced apart in the axial direction;

[0016] The insulating body is formed into a ring structure and surrounds the circumferential edge of the second recessed portion.

[0017] Preferably, the inner ring side of the insulating body is provided with a radially extending boss, which is sandwiched between the second recessed portion and the pressure relief component;

[0018] And / or, the battery cap further includes:

[0019] A sealing element is provided around the circumferential sidewall of the pressure relief element.

[0020] The second aspect of this utility model provides a battery, including the battery cap described in any of the above technical solutions.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] 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 a connecting component located on the side of the pressure relief component away from the top cover. An insulating component is sandwiched between the pressure relief component and the connecting component. The insulating component includes an insulating body, a covering part, and a flanged part. The covering part is located on the circumferential edge of the insulating body and protrudes axially away from the pressure relief component, so that the covering part surrounds the circumferential sidewall of the connecting component. The flanged part is located on the side of the covering part away from the insulating body and protrudes radially towards the connecting component, so that the flanged part can contact the side of the connecting component away from the pressure relief component. This allows the flanged part to support the connecting component, preventing the connecting component from separating from the pressure relief component prematurely under the pull of the tabs, thereby preventing premature power loss inside the battery, ensuring battery performance, and extending battery life.

[0023] 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

[0024] 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.

[0025] Figure 1 This is a schematic diagram of the structure of the battery cap provided in an embodiment of the present utility model;

[0026] Figure 2 A schematic diagram of the battery cap provided in an embodiment of this utility model from another perspective;

[0027] Figure 3 For along Figure 2 Cross-sectional view taken at point AA in the middle;

[0028] Figure 4 This is a schematic diagram of the structure of the insulating component in the battery cap provided in an embodiment of the present utility model.

[0029] Icons: 10-Top cover; 20-Pressure relief component; 21-First recessed platform; 22-Second recessed platform; 221-Scratched section; 30-Connector; 40-Insulating component; 41-Insulating body; 411-Lead; 42-Covering section; 421-Abutting section; 43-Flanged section; 50-Sealing component. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] 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.

[0033] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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 component 40.

[0040] The specific structure of the battery cap according to this embodiment, as described above, will be described below.

[0041] In this embodiment, as Figures 1 to 3 As shown, the top cover 10 is located on top of the battery cap, and the pressure relief component 20 is located on the side of the top cover 10 facing the inside of the battery. The pressure relief component 20 can be an explosion-proof valve or an explosion-proof plate. The pressure relief component 20 can be opened when the battery fails to connect the inside and outside of the battery, thereby venting the gas inside the battery to relieve pressure and ensure the safety of battery use.

[0042] In this embodiment, as Figure 3 As shown, the connector 30 is connected to the battery tab and the pressure relief component 20. Specifically, one side of the connector 30 is welded to the tab inside the battery casing, and the other side of the connector 30 is connected to the pressure relief component 20. The connector 30 is located on the side of the pressure relief component 20 away from the top cover 10, so that the pressure relief component 20 is sandwiched between the top cover 10 and the connector 30.

[0043] Furthermore, in this embodiment, as Figure 3 As shown, the insulating member 40 is formed into a ring structure and sandwiched between the pressure relief member 20 and the connecting member 30. Specifically, the insulating member 40 includes an insulating body 41, a covering portion 42, and a flange portion 43. The covering portion 42 is disposed on the circumferential edge of the insulating body 41 and protrudes axially away from the pressure relief member 20, such that the covering portion 42 surrounds the circumferential sidewall of the connecting member 30. The flange portion 43 is disposed on the side of the covering portion 42 away from the insulating body 41 and protrudes radially towards the connecting member. The flange 43 protrudes in the direction of the flange (i.e., the protruding direction of the flange 43 is set at an angle to the protruding direction of the covering part 42), so that the flange 43 can contact the side of the connector 30 away from the pressure relief part 20, that is, the flange 43 contacts the side of the connector 30 facing the electrode tab, so that the flange 43 plays a supporting role for the connector 30, preventing the connector 30 from separating from the pressure relief part 20 in advance under the pulling of the electrode tab, thereby avoiding the situation of premature power loss inside the battery.

[0044] It should be noted that, as mentioned above, the axial direction refers to the direction of the extension of the axis of the battery cap or the housing assembled with the battery cap, i.e. Figure 3 The vertical direction from a visual perspective; as mentioned above, the radial direction is perpendicular to the axial direction, i.e. Figure 3 The horizontal direction from the perspective of view.

[0045] In a preferred embodiment, the flange 43 is formed as a closed annular structure, which can contact the entire circumference edge of the connector 30 facing the tab, thereby improving the reliability and stability of the flange 43 in supporting the connector 30 and further preventing the connector 30 from separating from the pressure relief component 20 prematurely.

[0046] In this embodiment, as Figure 3 As shown, the axial section of the flange 43 is formed into two rectangular structures arranged opposite each other along the axis of the flange 43. The radial lengths of the two rectangular structures (i.e., the radial direction of the battery cap) are L1 and L2, respectively, in mm. Preferably, L1 = L2. The maximum radial dimension of the connector 30 (i.e., the radial direction of the battery cap) is L0, in mm. 10% ≤ (L1 + L2) / L0 ≤ 50%, thereby further ensuring that the flange 43 can provide reliable and stable support for the connector 30.

[0047] Furthermore, in preferred embodiments, such as Figure 3 As shown, in the thickness direction of the connector 30 (i.e., the axial direction of the battery cap as described above), the insulating member 40 is interference-fitted with the connector 30, so that the connector 30 is firmly snapped onto the insulating member 40, avoiding displacement of the connector 30 in its thickness direction under the pulling of the tab, thereby reducing the risk of premature separation of the connector 30 from the pressure relief plate.

[0048] Furthermore, in this embodiment, the distance between the insulating body 41 and the flange 43 is less than the thickness of the connector 30. This improves the axial fit between the insulating body 40 and the connector 30, allowing the connector 30 to be firmly fixed to the insulating body 40 in the axial direction. This prevents the connector 30 from shifting in its thickness direction under the pull of the tab, thereby reducing the risk of premature separation between the connector 30 and the pressure relief plate.

[0049] In this embodiment, as Figure 3 As shown, a protruding abutment portion 421 is formed on the side of the covering portion 42 facing the connector 30. The abutment portion 421 is formed as an annular structure on the covering portion 42, thereby improving the radial fit between the insulating member 40 and the connector 30 and further enhancing the ability of the insulating member 40 to support the connector 30.

[0050] In this embodiment, as Figures 1 to 3 As shown, the top cover 10 is welded to the circumferential edge area of ​​the pressure relief component 20; the connector 30 is welded to the central area of ​​the pressure relief component 20. Laser welding is preferably used for welding. This achieves the assembly of the top cover 10, the pressure relief component 20 and the connector 30. The top cover 10 and the connector 30 are welded at different positions on the pressure relief component 20, which can reduce the impact of the welding process on the shape accuracy and dimensional accuracy of the pressure relief component 20.

[0051] In this embodiment, as Figure 3 As shown, the pressure relief component 20 has a first recessed portion 21 protruding towards the connector 30. The connector 30 contacts the first recessed portion 21. Specifically, the connector 30 is welded to the side of the first recessed portion 21 facing the inside of the battery. Preferably, the contact area between the connector 30 and the first recessed portion 21 is 5 mm². 2 Up to 35mm 2 To meet the requirements of welding and battery performance.

[0052] Furthermore, in this embodiment, as Figure 3As shown, the pressure relief component 20 also has a second recessed portion 22 protruding towards the direction of the connector 30. The second recessed portion 22 is provided with a recessed groove portion 221. The opening of the groove portion 221 is provided facing the outside of the battery. When the battery fails, a large amount of gas is generated inside the battery, which will impact the pressure relief component 20. When the pressure inside the battery rises to the preset opening pressure, the pressure relief component 20 cracks at the position of the groove portion 221 and along the shape of the groove portion 221, so that the inside and outside of the battery are connected, thereby realizing the venting and pressure relief.

[0053] Furthermore, in this embodiment, as Figure 3 As shown, the first recessed portion 21 is disposed on the second recessed portion 22, such that the second recessed portion 22 and the connecting member 30 are spaced apart axially, thus leaving assembly space for the insulating member 40. The insulating body 41 is formed into a ring structure and surrounds the circumferential edge of the second recessed portion 22. Furthermore, in this embodiment, as... Figure 4 As shown, the inner ring side of the insulating body 41 is provided with a radially extending boss 411, which is formed into a ring structure and sandwiched between the second recessed portion 22 and the pressure relief member 20.

[0054] Preferably, such as Figure 3 As shown, the first recessed portion 21 is located in the middle of the second recessed portion 22. The grooved portion 221 described above is arranged around the first recessed portion 21, making the structural layout of the battery cap more reasonable. Under normal battery use, it ensures reliable connection between the connector 30 and the pressure relief component 20 and facilitates the assembly of the connector 30 and the pressure relief component 20. In addition, the battery has sufficient opening area when it fails, so as to achieve rapid pressure relief.

[0055] Furthermore, in this embodiment, such as Figures 1 to 3 As shown, the battery cap also includes a sealing element 50, which has the functions of sealing and insulation. The sealing element 50 surrounds the circumferential sidewall of the pressure relief element 20 and is formed into a ring structure. The sealing element 50 can be an elastic plastic sealing ring. When the battery cap is assembled with the battery housing, the sealing element 50 is sandwiched between the pressure relief element 20 and the inner wall of the battery housing.

[0056] In this embodiment, the sealing element 50 and the insulating element 40 are arranged radially spaced apart.

[0057] 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, and a connector disposed on the side of the pressure relief component away from the top cover. An insulating component is sandwiched between the pressure relief component and the connector. The insulating component includes an insulating body, a covering portion, and a flanged portion. The covering portion is disposed on the circumferential edge of the insulating body and protrudes axially away from the pressure relief component, so that the covering portion surrounds the circumferential sidewall of the connector. The flanged portion is disposed on the side of the covering portion away from the insulating body and protrudes radially towards the connector, so that the flanged portion can contact the side of the connector away from the pressure relief component, so that the flanged portion plays a supporting role for the connector, preventing the connector from separating from the pressure relief component prematurely under the pull of the tabs, thereby preventing premature power loss inside the battery.

[0058] 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. The flange on the battery cap can support the connector and prevent the battery from disconnecting prematurely, thereby improving the battery's performance and service life.

[0059] 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 provided on the side of the top cover facing the inside of the battery; A connector, which connects to the pressure relief component and the electrode lug, is located on the side of the pressure relief component away from the top cover; An insulating component is sandwiched between the pressure relief component and the connecting component. The insulating component includes an insulating body, a covering portion, and a flanged portion. The covering portion is disposed on the circumferential edge of the insulating body and protrudes axially away from the pressure relief component, such that the covering portion surrounds the circumferential sidewall of the connecting component. The flanged portion is disposed on the side of the covering portion away from the insulating body and protrudes radially towards the connecting component, such that the flanged portion can contact the side of the connecting component away from the pressure relief component.

2. The battery cap according to claim 1, characterized in that, The flanged portion is formed as a closed ring structure; the axial section of the flanged portion is formed as two rectangular structures arranged opposite each other along the axis of the flanged portion, and the radial lengths of the two rectangular structures are L1 and L2, respectively, in mm; the maximum radial dimension of the connector is L0, in mm; 10% ≤ (L1 + L2) / L0 ≤ 50%.

3. The battery cap according to claim 1, characterized in that, In the thickness direction of the connector, the insulating member is interference-fitted with the connector.

4. The battery cap according to claim 1, characterized in that, The side of the covering portion facing the connector has a protruding abutment portion.

5. The battery cap according to claim 1, characterized in that, The top cover is welded to the circumferential edge region of the pressure relief component; the connecting component is welded to the central region of the pressure relief component.

6. The battery cap according to claim 1, characterized in that, The pressure relief component has a first recessed portion protruding towards the connector. The connector contacts the first recessed portion, and the contact area between the connector and the first recessed portion is 5mm. 2 Up to 35mm 2 .

7. The battery cap according to claim 6, characterized in that, The pressure relief component also has a second recessed portion that protrudes toward the direction of the connector, and the second recessed portion has a recessed groove.

8. The battery cap according to claim 7, characterized in that, The first recessed portion is disposed on the second recessed portion, such that the second recessed portion and the connecting member are spaced apart in the axial direction; The insulating body is formed into a ring structure and surrounds the circumferential edge of the second recessed platform.

9. The battery cap according to claim 8, characterized in that, The inner ring side of the insulating body is provided with a radially extending boss, which is sandwiched between the second recessed portion and the pressure relief component. And / or, the battery cap further includes: A sealing element is provided around the circumferential sidewall of the pressure relief element.

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

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