Battery cap and battery

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cap and a battery. According to the battery cap, a connecting piece is connected with the side, facing the interior of a battery, of a connecting part on a pressure relief piece, a thinning groove is formed in the side, facing the interior of the battery, of the connecting piece so that a thinning area can be formed on the connecting piece, and the thickness size of the thinning area in the axial direction of the battery cap is H; a first groove is formed in one side, facing the exterior of the battery, of the thinning area, and the depth size of the first groove in the axial direction of the battery cap is H1; a second groove is formed in one side, facing the interior of the battery, of the thinning area, and the depth size of the second groove in the axial direction of the battery cap is H2; 0.2 < = (H1 + H2) / H < = 0.6. According to the utility model, the pressure relief piece can be separated from the connecting piece in time before being opened, the safety performance of the battery is ensured, the connecting piece has enough structural strength, and the connecting piece is prevented from being deformed or prematurely powered off under impact, so that the service life of the battery is 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] Lithium-ion batteries have advantages such as light weight, high energy density, high power, and long service life, and are widely used in two-wheeled vehicles, energy storage base stations, and new energy vehicles. The battery cap and casing form a sealed space for assembling the electrode assembly. The cap includes a top cover, an orifice plate, an insulating ring, a sealing ring, and an explosion-proof valve. The orifice plate connects to the tabs on the electrode assembly, and the explosion-proof valve is welded to the orifice plate. In the event of thermal runaway, the explosion-proof valve opens, connecting the inside and outside of the battery to release gas and pressure. Before the explosion-proof valve opens, the orifice plate and the explosion-proof valve need to be disconnected to achieve early power disconnection. If the orifice plate cannot be disconnected in time before the explosion-proof valve opens, it will affect the battery's safety performance. Excessively reducing the thickness of the orifice plate to facilitate smooth disconnection will also reduce the structural strength of the orifice plate, affecting the battery's service 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 orifice plate and explosion-proof valve in the existing battery cap cannot guarantee timely disconnection before the explosion-proof valve is opened, which affects the safety performance of the battery. However, if the thickness of the orifice plate is excessively reduced in order to disconnect the power in time, it will also affect the service life of the battery.

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

[0005] The pressure relief component has a connecting part that protrudes towards the inside of the battery.

[0006] A connector is connected to the side of the connecting part facing the inside of the battery. A thinning groove is formed on the side of the connector facing the inside of the battery, so that a thinning area is formed on the connector. The thickness of the thinning area in the axial direction of the battery cap is H, in mm. A first groove is formed on the side of the thinning area facing the outside of the battery. The depth of the first groove in the axial direction of the battery cap is H1, in mm. A second groove is formed on the side of the thinning area facing the inside of the battery. The depth of the second groove in the axial direction of the battery cap is H2, in mm. 0.2≤(H1+H2) / H≤0.6.

[0007] Preferably, the connector and the connecting portion are welded together to form a welded portion, and the first groove and the second groove are formed into an annular structure surrounding the welded portion.

[0008] Preferably, the length of the middle ring line on the first groove and / or the second groove, located between the inner and outer ring walls, in the radial direction of the battery cap is L, where 5H ≤ L ≤ 20H.

[0009] Preferably, H1 > H2.

[0010] Preferably, 0.2mm≤H≤1mm.

[0011] Preferably, the projections of the first groove and the second groove onto the thinning region at least partially overlap.

[0012] Preferably, the pressure relief component is provided with a recessed groove, the groove being arranged around the circumferential outer side of the connecting portion, and the projection of the groove on the connecting component being arranged around the circumferential outer side of the first groove and the second groove.

[0013] Preferably, it further includes:

[0014] An insulating member is formed in a ring structure and is sandwiched between the pressure relief member and the connector in the axial direction of the battery cap. The outer circumferential edge of the insulating member has a covering portion extending toward the inside of the battery, and the covering portion covers the outer circumferential edge of the connector.

[0015] Preferably, it further includes:

[0016] A top cover is located on the side of the pressure relief component facing the outside of the battery;

[0017] A sealing element is provided around the circumferential outer edge of the pressure relief element and the top cover.

[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 pressure relief component in the battery cap of this utility model has a connecting portion protruding towards the inside of the battery. The connecting portion is connected to the side of the connecting portion facing the inside of the battery. A thinning groove is formed on the side of the connecting portion facing the inside of the battery, so that a thinning area is formed on the connecting portion. In this way, the thickness of the connecting portion in a local area is reduced while ensuring that the connecting portion has a certain structural strength. The thickness of the thinning area in the axial direction of the battery cap is H. A first groove is formed on the side of the thinning area facing the outside of the battery. The depth of the first groove in the axial direction of the battery cap is H1. A second groove is formed on the side of the thinning area facing the inside of the battery. The depth of the second groove in the axial direction of the battery cap is H2. 0.2≤(H1+H2) / H≤0.6. In this way, grooves are formed on both sides of the thinning area facing the inside and outside of the battery, which ensures that the connecting portion can break smoothly at the first and second grooves under the pressure inside the battery. This ensures that the pressure relief component can be separated from the connecting portion in time before it opens, ensuring the battery safety performance. It also ensures that the connecting portion has sufficient structural strength, preventing the connecting portion from deforming or prematurely disconnecting the power under impact, thereby ensuring the battery's service life.

[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 schematic diagram of the axial cross-sectional structure of the battery cap provided in this embodiment of the utility model;

[0025] Figure 3 for Figure 2 Enlarged structural diagram at point A;

[0026] Figure 4 This is a structural schematic diagram of the battery cap provided in an embodiment of the present invention from another perspective.

[0027] Icons: 10-Pressure relief component; 11-Connecting part; 12-Scratched groove; 20-Connecting component; 21-Thinning groove; 22-Thinning area; 201-First groove; 202-Second groove; 203-Connecting hole; 30-Welding part; 40-Insulating component; 41-Covering part; 50-Top cover; 60-Sealing component. Detailed Implementation

[0028] 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.

[0029] 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.

[0030] 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.

[0031] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] According to a first aspect of the present invention, a battery cap is provided, which includes a pressure relief member 10 and a connector 20.

[0038] The specific structure of the battery cap according to this embodiment, as described above, will be described below.

[0039] When the battery is in thermal runaway, the pressure relief component 10 can be opened under the pressure inside the battery. Specifically, the groove on the pressure relief component 10 (i.e., the groove 12 described below) cracks, so that the inside and outside of the battery are connected, thereby realizing the release of gas and pressure.

[0040] In this embodiment, as Figure 2 As shown, the pressure relief member 10 has a connecting portion 11 protruding towards the inside of the battery. The pressure relief member 10 can be formed into a plate-like structure, and the connecting portion 11 can be formed by stamping from the side of the pressure relief member 10 facing the outside of the battery towards the inside of the battery. The pressure relief member 10 is provided with a recessed groove 12, which is provided on the side of the pressure relief member 10 facing the outside of the battery and is formed into an annular structure surrounding the connecting portion 11 on the circumferential outer side.

[0041] In this embodiment, as Figure 2 and Figure 3 As shown, the connector 20 is connected to the side of the connector 11 facing the inside of the battery. A thinning groove 21 is provided on the side of the connector 20 facing the inside of the battery, so that a thinning area 22 is formed on the connector 20. The thinning groove 21 is located in the area enclosed by the scoring groove 12. The thinning groove 21 can be a groove in the shape of a circle, polygon, or ellipse. The thickness of the thinning area 22 in the axial direction of the battery cap is H, in mm (that is, the distance from the bottom of the thinning groove 21 to the outside of the connector 20 facing the battery is H). In this way, the thickness of the local area of ​​the connector 20 is reduced while ensuring that the connector 20 has a certain structural strength; preferably, 0.2mm≤H≤1mm.

[0042] In this embodiment, as Figure 3As shown, a first groove 201 is formed on the side of the thinning region 22 facing the outside of the battery, and a second groove 202 is formed on the side of the thinning region 22 facing the inside of the battery. The projection of the groove 12 on the connector 20 is arranged around the circumferential outer side of the first groove 201 and the second groove 202. The depth dimension of the first groove 201 in the axial direction of the battery cap is H1, in mm; the depth dimension of the second groove 202 in the axial direction of the battery cap is H2, in mm; 0.2≤(H1+H2) / H≤0.6, thus the thinning region 22 facing the inside of the battery has a depth of H1. The battery has groove structures on both the inner and outer sides to reduce the thickness of the thinning area 22. This ensures that the connector 20 breaks smoothly at the first groove 201 and the second groove 202 under the pressure inside the battery. This keeps the groove 12 structure intact before the pressure relief component 10 separates from the connector 20, thus ensuring that the pressure relief component 10 can separate from the connector 20 in time before it opens, ensuring the battery's safety performance. It also ensures that the connector 20 has sufficient structural strength to prevent deformation or premature power loss under impact, thereby ensuring the battery's service life.

[0043] Preferably, in this embodiment, such as Figure 3 As shown, H1 > H2, which helps the connector 20 to bulge outward when the internal pressure of the battery acts on the surface of the connector 20 facing the inside of the battery, ensuring that the connector 20 is disconnected along the shape of the first groove 201 and the second groove 202, so that the part connected to the electrode tab and the part connected to the pressure relief member 10 on the connector 20 are separated.

[0044] Preferably, in this embodiment, such as Figure 3 As shown, 0.2mm≤H≤1mm, thus ensuring that the connector 20 has sufficient structural strength and can crack when power is cut off.

[0045] In this embodiment, as Figure 4 As shown, the connector 20 and the connector 11 are welded together to form a welded part 30. The welded part 30 is a weld mark produced by a welding process. The welded part 30 can be formed into a ring structure, which increases the welding area and reduces the impact of the heat generated by welding on the connector 20 and the pressure relief member 10. The first groove 201 and the second groove 202 are formed into a ring structure surrounding the welded part 30, such as a circular, polygonal or elliptical ring structure. The electrode tab is installed on the surface of the connector 20 facing the inside of the battery and located on the circumferential outer side of the first groove 201 and the second groove 202, so as to ensure that the electrode tab separates from the pressure relief member 10 after the first groove 201 and the second groove 202 crack, thereby realizing power disconnection.

[0046] Preferably, the welding part 30 is disposed in the thinning groove 21, that is, the pressure relief member 10 and the connecting member 20 are welded together from the inside of the thinning groove 21.

[0047] Furthermore, in this embodiment, as Figure 2 As shown, the radial length of the middle ring line on the first groove 201 and / or the second groove 202, located between the inner and outer annular walls, is L, where 5H ≤ L ≤ 20H. This satisfies the welding requirements and ensures that the first groove 201 and / or the second groove 202 are broken before the internal pressure reaches the opening pressure of the pressure relief component 10. Preferably, the L dimension on the first groove 201 and the second groove 202 is the same, thereby ensuring the reliability of the disconnection between the pressure relief component 10 and the electrode tab.

[0048] In this embodiment, as Figure 2 and Figure 3 As shown, the projections of the first groove 201 and the second groove 202 on the thinning region 22 at least partially overlap, thereby further reducing the thickness of the thinning region 22 and improving the reliability and effectiveness of power-off before the pressure relief component 10 is activated. Preferably, the projections of the first groove 201 and the second groove 202 on the thinning region 22 completely overlap.

[0049] In this embodiment, the axial cross-sectional shape of the first groove 201 and the second groove 202 can be two V-shaped, U-shaped or trapezoidal openings arranged opposite each other along the axial direction of the battery cap.

[0050] In this embodiment, as Figure 2 As shown, the battery cap also includes an insulating member 40, which is formed in a ring structure and sandwiched between the pressure relief member 10 and the connector 20 in the axial direction of the battery cap. This ensures that the connector 20 and the pressure relief member 10 can be insulated and separated after the connector 20 cracks, effectively ensuring that the pressure relief member 10 is no longer connected to the tab and achieving reliable power disconnection. Preferably, the outer circumferential edge of the insulating member 40 is formed with a covering part 41 extending toward the inside of the battery. The covering part 41 is formed in a ring structure and covers the outer circumferential edge of the connector 20, thereby improving the insulation protection effect of the connector 20.

[0051] Furthermore, in this embodiment, such as Figures 1 to 4 As shown, the battery cap also includes a top cover 50 and a sealing element 60. The top cover 50 is disposed on the side of the pressure relief element 10 facing the outside of the battery and is fitted to the outer edge surface of the pressure relief element 10. The top cover 50 and the pressure relief element 10 can be welded together. The central part of the top cover 50 forms a boss protruding outward from the battery, so that the boss and the pressure relief element 10 are spaced apart in the axial direction. The circumferential sidewall of the boss is provided with a through hole, so that the inside and outside of the battery can be connected after the groove 12 is cracked.

[0052] The sealing element 60 can be an elastic and insulating rubber ring. The sealing element 60 is arranged around the circumferential edge of the pressure relief element 10 and the top cover 50. Specifically, it is arranged around the circumferential edge of the pressure relief element 10, so that when the battery cover is assembled with the battery housing, the pressure relief element 10 and the inner wall of the battery housing together compress the sealing element 60, thereby achieving a sealed assembly and also playing an insulating and protective role for the battery housing.

[0053] Furthermore, in this embodiment, such as Figure 4 As shown, the connector 20 has a through hole 203, which is a through hole structure that penetrates the connector 20 to ensure that the air pressure inside the battery can pass through the through hole 203 and act on the surface of the pressure relief component 10 facing the inside of the battery, so that the pressure relief component 10 is in a state of being pushed outward of the battery, thereby pulling the thinned area 22 on the connector 20 to deform outward, which helps the first groove 201 and the second groove 202 to crack.

[0054] It should be noted that, in this embodiment, the axial direction of the battery cap is... Figure 2 The vertical direction from the perspective of the battery cap is the radial direction. Figure 2 The horizontal direction from the perspective of view.

[0055] According to the present invention, a pressure relief component in a battery cap has a connecting portion protruding towards the inside of the battery. The connecting portion is connected to the side of the connecting component facing the inside of the battery. A thinning groove is formed on the side of the connecting component facing the inside of the battery, thereby forming a thinning area on the connecting component. This reduces the thickness of a local area of ​​the connecting component while ensuring a certain structural strength. The thickness of the thinning area in the axial direction of the battery cap is H. A first groove is formed on the side of the thinning area facing the outside of the battery. The depth of the first groove in the axial direction of the battery cap is H1. A second groove is provided on one side inside the battery. The depth of the second groove in the axial direction of the battery cap is H2; 0.2≤(H1+H2) / H≤0.6. In this way, grooves are provided on both sides of the thinning area facing the inside and outside of the battery. This ensures that the connector can break smoothly at the first and second grooves under the pressure inside the battery. This ensures that it can be separated from the connector in time before the pressure relief device is opened, ensuring the safety performance of the battery. It also ensures that the connector has sufficient structural strength to prevent the connector from deforming or prematurely disconnecting the power under impact, thereby ensuring the service life of the battery.

[0056] 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 tabs inside the battery casing. The pressure relief component and the connecting component in the battery cap can be separated in time to ensure that the power is cut off in time before the pressure relief component is opened, thereby improving the safety performance of the battery and ensuring the structural strength of the battery cap, thereby improving the service life and product quality of the battery.

[0057] 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, The battery cap comprises: a pressure relief member formed with a connecting portion protruding towards the inside of the battery; a connecting member connected to the side of the connecting portion facing the inside of the battery, the side of the connecting member facing the inside of the battery is provided with a thinning groove, so that the connecting member is formed with a thinning area, the thickness dimension of the thinning area in the axial direction of the battery cap is H, unit: mm; the side of the thinning area facing the outside of the battery is provided with a first groove, the depth dimension of the first groove in the axial direction of the battery cap is H1, unit: mm; the side of the thinning area facing the inside of the battery is provided with a second groove, the depth dimension of the second groove in the axial direction of the battery cap is H2, unit: mm; 0.2≤(H1+H2) / H≤0.

6.

2. The battery cap of claim 1, wherein, The connecting member and the connecting portion are welded to form a welded portion, and the first groove and the second groove are formed in an annular structure around the welded portion.

3. The battery cap of claim 2, wherein, The length dimension of the middle ring line between the inner ring wall and the outer ring wall on the first groove and / or the second groove in the radial direction of the battery cap is L, 5H≤L≤20H.

4. The battery cap of claim 1, wherein, H1>H2.

5. The battery cap of claim 1, wherein, 0.2mm≤H≤1mm.

6. The battery cap of claim 1, wherein, The projections of the first groove and the second groove on the thinning area at least partially coincide.

7. The battery cap of claim 1, wherein, The pressure relief member is provided with a recessed score groove, which is arranged on the circumferential outer side of the connecting portion, and the projection of the score groove on the connecting member is arranged on the circumferential outer side of the first groove and the second groove.

8. The battery cap of claim 1, wherein, Further comprising: an insulating member formed in an annular structure and clamped between the pressure relief member and the connecting member in the axial direction of the battery cap, the circumferential outer edge of the insulating member is formed with a cladding portion extending towards the inside of the battery, and the cladding portion clads the circumferential outer edge of the connecting member.

9. The battery cap of claim 1, wherein, Further comprising: a top cover arranged on the side of the pressure relief member facing the outside of the battery; a sealing member cladded around the circumferential outer edge of the pressure relief member and the top cover.

10. A battery, characterized by The battery cap comprises any one of claims 1-9. The battery cap comprises any one of claims 1-9.

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