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 battery cap comprises: a top cap; the pressure relief piece is arranged on one side, facing the interior of the battery, of the top cover; a turnup part extending towards the direction close to the top cover is formed on the circumferential side wall of the pressure relief piece, and the turnup part is arranged on the circumferential outer edge of the top cover in a surrounding mode; the sealing part is arranged on the circumferential outer edge of the flanging part in a surrounding mode, the end, facing the outer portion of the battery, of the sealing part extends in the direction close to the axis of the pressure relief part so as to form an edge covering part arranged on the side, facing the outer portion of the battery, of the flanging part, and the sealing part and the flanging part are bent in the direction close to the axis of the top cover together; and the edge covering part and the flanging part can be in contact with the surface, facing the outside of the battery, of the top cover. According to the utility model, the reliable sealing of the battery can be realized, the leakage condition of the battery is improved, and the use stability and safety of the battery are further improved.

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 offer advantages such as high capacity, high output voltage, good charge-discharge cycle performance, and stable output voltage. A cylindrical lithium battery consists of a cap, a casing, and electrode arrays. The cap is sealed to the casing to enclose the electrode arrays within a closed space. The sealing performance of a cylindrical lithium battery directly affects its stability and safety, and the sealing effect is directly related to the sealing ring on the cap. Existing battery caps include a sealing ring and a top cover. After the cap is assembled with the casing, the casing and sealing ring are pressed together against the top cover, causing part of the sealing ring to be sandwiched between the top cover and the casing. This compression of the sealing ring achieves a sealed assembly. If the compression of the sealing ring by the top cover and casing is insufficient, it will affect the battery's sealing performance and easily lead to leakage. Conversely, if the compression of the sealing ring by the top cover and casing is excessive, the sealing ring is prone to cracking or even breakage, also resulting in battery leakage. 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 sealing ring of the existing battery cap is compressed by the shell and the top cover, resulting in unreliable sealing. The compression is too small or too large, which can easily cause battery leakage and affect the stability and safety 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; the circumferential sidewall of the pressure relief component is formed with a flange extending toward the top cover, and the flange is disposed around the circumferential outer edge of the top cover.

[0007] A sealing element is disposed around the circumferential outer edge of the flange portion. The end of the sealing element facing the outside of the battery extends in a direction close to the axis of the pressure relief element to form a rim portion disposed on the side of the flange portion facing the outside of the battery. The sealing element and the flange portion are bent together in a direction close to the axis of the top cover, so that both the rim portion and the flange portion can contact the surface of the top cover facing the outside of the battery.

[0008] Preferably, before the seal and the flange are bent, the thickness of the edging portion in the radial direction of the battery cap is M, where 0.5mm≤M≤1.5mm.

[0009] Preferably, before the seal and the flange are bent, the height dimension of the edging portion in the axial direction of the battery cap is N, where 0.3mm≤N≤1.0mm.

[0010] Preferably, before the sealing element and the flange are bent, a gap H is provided between the edge portion and the flange portion in the axial direction of the battery cap, where 0.05mm≤H≤0.2mm.

[0011] Preferably, both the flanged portion and the edge-wrapping portion are formed into a ring structure, and the flanged portion and the edge-wrapping portion are coaxially arranged.

[0012] Preferably, before the seal and the flange are bent, the side of the edge portion facing the axis of the top cover protrudes from the side of the flange portion facing the axis of the top cover in the radial direction of the battery cap.

[0013] Preferably, the thickness of the seal is greater than the thickness of the pressure relief component.

[0014] Preferably, it further includes:

[0015] A connector is disposed on the side of the pressure relief component facing the inside of the battery, and the connector is connected to the pressure relief component and the electrode tab respectively.

[0016] Preferably, it further includes:

[0017] An insulating element is disposed around the circumferential outer edge of the connector; in the axial direction of the battery cap, a portion of the insulating element is sandwiched between the connector and the pressure relief element.

[0018] The second aspect of this utility model provides a battery, including the battery cap described in any of the above technical solutions.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] The battery cap of this utility model includes a top cover, a pressure relief component and a sealing component disposed on the side of the top cover facing the inside of the battery; the circumferential sidewall of the pressure relief component has a flange extending towards the top cover, the flange surrounding the circumferential outer edge of the top cover, so that the flange can be bent towards the top cover, thereby achieving a tight fit between the pressure relief component and the top cover; the sealing component is disposed around the circumferential outer edge of the flange, and the end facing the outside of the battery extends towards the axis of the pressure relief component to form a edging portion disposed on the side of the flange facing the outside of the battery. The part serves to seal the gap between the pressure relief component and the top cover, improving the assembly sealing performance of the pressure relief component and the top cover. During the assembly process of the battery cap and the housing, the sealing component and the flanged part are bent together towards the axis of the top cover, so that the flanged part and the flanged part can contact the surface of the top cover facing the outside of the battery. Some of the sealing component can be pressed between the housing and the pressure relief component, and some of the sealing component can be pressed between the housing and the top cover to form different compression amounts, thereby ensuring reliable sealing, improving battery leakage, and thus improving the stability and safety of battery use.

[0021] 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

[0022] 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.

[0023] Figure 1 This is a schematic diagram of the structure of the battery cap provided in an embodiment of the present utility model;

[0024] Figure 2 A structural cross-sectional view of the battery cap provided in an embodiment of this utility model;

[0025] Figure 3 for Figure 2 A magnified structural diagram of point A in the middle.

[0026] Icons: 10-Top cover; 20-Pressure relief component; 21-Flanged edge; 30-Sealing component; 31-Edge wrapping component; 40-Connector; 50-Insulation component. Detailed Implementation

[0027] 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.

[0028] 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.

[0029] 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.

[0030] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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, and a sealing component 30.

[0037] The specific structure of the battery cap according to this embodiment, as described above, will be described below.

[0038] In this embodiment, as Figure 1 and Figure 2As shown, the main body of the top cover 10 is formed as a plate-like structure, such as a circular plate-like structure to fit a cylindrical battery. A protrusion facing outwards from the battery is provided in the middle of the top cover 10. Through holes are provided on the circumferential sidewalls of the protrusion to allow gas flow when the pressure relief component 20 is opened. 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 disc, and its surface has grooves. When the battery fails and the internal pressure reaches the opening threshold, the grooves burst, causing the pressure relief component 20 to open, achieving communication between the inside and outside of the battery, thereby venting gas and relieving pressure, and ensuring battery safety performance.

[0039] In this embodiment, as Figures 1 to 3 As shown, the circumferential sidewall of the pressure relief component 20 has a flange 21 extending toward the top cover 10. The flange 21 is disposed around the circumferential outer edge of the top cover 10 and protrudes from the main body of the top cover 10, allowing the flange 21 to bend toward the top cover 10, thus achieving a tight fit between the flange 21 and the top cover 10. The sealing component 30 is disposed around the circumferential outer edge of the flange 21. The end of the sealing component 30 facing the outside of the battery extends toward the axis of the pressure relief component 20 to form a rim 31 on the side of the flange 21 facing the outside of the battery. After the battery cap and the housing are assembled, the rim 31 has the function of sealing the gap between the pressure relief component 20 and the top cover 10, thereby improving the assembly sealing performance of the pressure relief component 20 and the top cover 10.

[0040] It should be noted that the flanged portion 21 extends outward along the axial direction of the battery cap, and the edge-wrapping portion 31 extends inward along the radial direction of the battery cap. The axial direction of the battery cap is... Figure 2 The vertical direction from the perspective of the battery cap, the radial direction is Figure 2 The horizontal direction from the perspective of view.

[0041] In this embodiment, during the assembly of the battery cap and the housing, the sealing element 30 and the flange 21 are bent together toward the axis of the top cover 10 until the flange 31 and the flange 21 are in contact with the surface of the top cover 10 facing the outside of the battery. This allows part of the sealing element 30 to be pressed between the housing and the pressure relief element 20, and part of the sealing element 30 (i.e., the flange 31) to be pressed between the housing and the top cover 10, so as to form different compression amounts, thereby forming a double sealing protection, ensuring reliable sealing, and improving battery leakage.

[0042] In this embodiment, the seal 30 may be a resilient and insulating sealing ring, which can generate compression and separate the housing and the pressure relief element 20 to form an insulating protection.

[0043] Preferably, in this embodiment, such as Figure 3As shown, before the sealing part 30 and the flange 21 are bent, the thickness of the edge part 31 in the radial direction of the battery cap is M, 0.5mm≤M≤1.5mm. This ensures that the edge part 31 has sufficient compression after bending while ensuring the sealed connection between the flange 21 and the top cover 10, thus ensuring the assembly and sealing of the battery cap and the housing.

[0044] Preferably, in this embodiment, such as Figure 3 As shown, before the sealing element 30 and the flanged part 21 are bent, the height dimension of the edge part 31 in the axial direction of the battery cap is N, 0.3mm≤N≤1.0mm, so as to avoid the size of N being too small and affecting the sealing performance, or the size of N being too large and affecting the battery's power transmission or the venting when the battery fails.

[0045] Preferably, in this embodiment, such as Figure 3 As shown, before the sealing element 30 and the flanged part 21 are bent, a gap H is provided between the edge portion 31 and the flanged part 21 in the axial direction of the battery cap, where 0.05mm≤H≤0.2mm. This facilitates the assembly of the edge portion 31 and the flanged part 21 and also avoids the situation where the size of H is too large, resulting in an excessively large distance between the edge portion 31 and the flanged part 21 in the radial direction of the battery cap after the flanged part 21 and the sealing element 30 are bent, which would affect the sealing performance.

[0046] In this embodiment, as Figure 1 As shown, both the flanged portion 21 and the edge-wrapping portion 31 are formed into a ring structure, such as a circular, elliptical, or polygonal closed ring structure. The flanged portion 21 and the edge-wrapping portion 31 are coaxially arranged so that after the battery cap is assembled with the housing, the force on the sealing element 30 at all locations in the circumferential direction is uniform, thereby ensuring sealing uniformity and improving the sealing effect.

[0047] Furthermore, in this embodiment, as Figure 3 As shown, before the sealing element 30 and the flange 21 are bent, on the radial side of the battery cap, the side of the flange 21 facing the axis of the top cover 10 protrudes from the side of the flange 21 facing the axis of the top cover 10. That is, on the radial side of the battery cap, the distance between the flange 31 and the top cover 10 (this distance can be positive or negative. When the distance is positive, it means that the flange 31 and the top cover 10 are spaced apart on the radial side of the battery cap. When the distance is negative, it means that the portion of the flange 31 projected on the axial side of the battery cap is projected onto the surface of the top cover 10 facing the outside of the battery) is less than the distance between the flange 21 and the top cover 10. This ensures that after the sealing element 30 is bent, the flange 31 can be effectively pressed against the surface of the top cover 10. This achieves reliable sealing of the gap between the pressure relief element 20 and the top cover 10 and provides sufficient compression between the top cover 10 and the housing to ensure the sealing strength of the housing and the battery cap assembly.

[0048] In this embodiment, as Figure 2 and Figure 3 As shown, the thickness of the seal 30 is greater than that of the pressure relief component 20. The pressure relief component 20 is formed as a metal plate or sheet structure. The minimum thickness of the seal 30 is greater than that of the maximum thickness of the pressure relief component 20. This is to avoid the situation where the thickness of the pressure relief component 20 is too large, which would increase the difficulty of breaking the groove as described above. This ensures that the pressure relief component 20 can be opened smoothly when the battery fails, and that the seal 30 can form a compression amount that meets the sealing strength. This avoids the situation where the thickness of the seal 30 is too small, which would cause the seal 30 to crack or even break.

[0049] In this embodiment, as Figure 2 As shown, the battery cap also includes a connector 40 and an insulator 50. The connector 40 is formed into a plate-like structure and is disposed on the side of the pressure relief component 20 facing the inside of the battery. The connector 40 is connected to the pressure relief component 20 and the electrode tab respectively to realize the transmission of electrical energy. Preferably, the electrode tab is installed on the side of the connector 40 facing the inside of the battery. The connector 40 is welded to the pressure relief component 20. Before the pressure relief component 20 is opened, the connector 40 will crack to separate it from the pressure relief component 20, thereby disconnecting the internal circuit of the battery and realizing power failure protection. The connector 40 is provided with an opening to guide the gas inside the battery to the pressure relief component 20.

[0050] Furthermore, in this embodiment, as Figure 2 As shown, the insulating member 50 is formed into a ring structure and is disposed around the circumferential outer edge of the connector 40 to achieve insulation protection for the connector 40; in the axial direction of the battery cap, part of the insulating member 50 is sandwiched between the connector 40 and the pressure relief member 20, so that when the connector 40 and the pressure relief member 20 are separated, the connector 40 and the pressure relief member 20 are separated to achieve insulation protection.

[0051] A battery cap according to this utility model includes a top cover, a pressure relief component and a sealing component disposed on the side of the top cover facing the inside of the battery; the circumferential sidewall of the pressure relief component has a flange extending towards the top cover, the flange surrounding the circumferential outer edge of the top cover, so that the flange can be bent towards the top cover, thereby achieving a tight fit between the pressure relief component and the top cover; the sealing component is disposed around the circumferential outer edge of the flange, and one end facing the outside of the battery extends towards the pressure relief component, forming a sealing component disposed on the flange facing the battery. The outer edge of the casing seals the gap between the pressure relief component and the top cover, improving the sealing performance of the assembly. During the assembly of the battery cap and the casing, the seal and the flange are bent together towards the top cover, allowing both the edge and the flange to contact the surface of the top cover facing the battery. Some of the seals can be pressed between the casing and the pressure relief component, and some can be pressed between the casing and the top cover, creating different compression levels to ensure reliable sealing and improve battery leakage.

[0052] According to the present invention, a battery includes a battery cap as described above. The battery cap is assembled at the opening of the housing. The opening of the housing, the sealing element, and the flange are bent together toward the direction close to the top cover, so that the flange and the edge are sandwiched between the top cover of the housing, which has reliable sealing performance, improves battery leakage, and enhances the stability and safety of battery use.

[0053] 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; the circumferential sidewall of the pressure relief component is formed with a flange extending toward the top cover, and the flange is disposed around the circumferential outer edge of the top cover. A sealing element is disposed around the circumferential outer edge of the flange portion. The end of the sealing element facing the outside of the battery extends in a direction close to the axis of the pressure relief element to form a rim portion disposed on the side of the flange portion facing the outside of the battery. The sealing element and the flange portion are bent together in a direction close to the axis of the top cover, so that both the rim portion and the flange portion can contact the surface of the top cover facing the outside of the battery.

2. The battery cap according to claim 1, characterized in that, Before the sealing element and the flange are bent, the thickness of the edge portion in the radial direction of the battery cap is M, where 0.5mm≤M≤1.5mm.

3. The battery cap according to claim 1, characterized in that, Before the sealing element and the flange are bent, the height dimension of the edge portion in the axial direction of the battery cap is N, where 0.3mm≤N≤1.0mm.

4. The battery cap according to claim 1, characterized in that, Before the sealing element and the flanged part are bent, a gap H is provided between the edge portion and the flanged part in the axial direction of the battery cap, where 0.05mm≤H≤0.2mm.

5. The battery cap according to claim 1, characterized in that, Both the flanged portion and the edge-wrapping portion are formed into a ring structure, and the flanged portion and the edge-wrapping portion are coaxially arranged.

6. The battery cap according to claim 5, characterized in that, Before the seal and the flange are bent, the side of the edge portion facing the axis of the top cover protrudes from the side of the flange portion facing the axis of the top cover in the radial direction of the battery cap.

7. The battery cap according to claim 1, characterized in that, The thickness of the seal is greater than the thickness of the pressure relief component.

8. 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 the connector is connected to the pressure relief component and the electrode tab respectively.

9. The battery cap according to claim 8, characterized in that, Also includes: An insulating element is disposed around the circumferential outer edge of the connector; in the axial direction of the battery cap, a portion of the insulating element is sandwiched between the connector and 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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