Battery cap and battery

Abstract

The utility model relates to battery technical field especially is related to a battery cap and battery. The battery cap includes: the first boss is formed to the pressure relief spare, the second boss is formed to the first boss, and the first recess is formed to the surface of pressure relief spare away from the first boss, the connecting piece is set to the side of pressure relief spare to the inside of battery, and is connected with the second boss, the minimum distance between the side wall of first recess and the side wall of first boss in the first direction is w1, 0.07mm <= w1 <= 0.1mm, the distance between the bottom wall of first recess and the surface of pressure relief spare to the outside of battery in the second direction is w2, 0.2mm <= w2 <= 0.4mm, the utility model can be disconnected under the action of gas pressure first boss and the main body of pressure relief spare, to open pressure relief spare, need not open the mark groove on pressure relief spare and reduce the thickness of pressure relief spare, improve processing efficiency and product yield, reduce the production cost of processing difficulty.

Description

Technical Field

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

[0002] Cylindrical lithium batteries are classified into lithium cobalt oxide, lithium manganese oxide, and ternary lithium batteries. Each of these three material systems has its own advantages and is widely used in digital devices, lighting fixtures, power tools, and portable mobile energy sources. Currently, small cylindrical batteries consist of a casing and a cap. The cap typically comprises a top cover, an explosion-proof valve, an insulating sheet, a perforated plate, and an outer sealing ring. The explosion-proof valve and perforated plate are connected by through-welding, and then the explosion-proof valve and top cover are connected by spot welding. Finally, the entire cap is sealed by compressing the sealing ring through the casing's flange. The explosion-proof valve in the cap uses a slotted design, requiring additional machining to retain residual thickness, which helps to open the valve when venting and depressurization are needed. Because additional slotting is required, machining efficiency is affected, the machining is more difficult, and the residual material is less, resulting in a low yield and impacting product quality. 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 existing battery caps where the explosion-proof valve requires additional slotting, which affects processing efficiency, is difficult to process, has little residual material, low processing yield, and affects product quality.

[0004] The first aspect of this utility model provides a battery cap, comprising: Top cover; A pressure relief component is provided on the side of the top cover facing the inside of the battery. A first protrusion protruding towards the inside of the battery is formed on the pressure relief component, and a second protrusion protruding towards the inside of the battery is formed on the first protrusion. A first groove is formed on the surface of the pressure relief component facing away from the first protrusion. A connector is disposed on the side of the pressure relief member facing the inside of the battery and is connected to the second boss; The minimum distance between the sidewall of the first groove and the sidewall of the first boss in the first direction is w1, 0.07mm≤w1≤0.1mm; In the second direction, the thickness of the portion of the pressure relief component that contacts the side of the top cover facing the inside of the battery is w2, where 0.2mm≤w2≤0.4mm.

[0005] Preferably, the connector has a second groove formed on its surface facing the inside of the battery, thereby forming a thinning area on the connector. The pressure relief member is welded to the thinning area to form a welded portion, and the welded portion is spaced apart from the sidewall of the second groove in a first direction. Preferably, the thickness dimension of the thinning region in the second direction is w3, where 0.05mm≤w3≤0.07mm. Preferably, a reinforcing portion is formed in the second groove, protruding from the bottom wall of the second groove toward the inside of the battery. Preferably, the width dimension of the second groove in the first direction is D; the minimum distance between the reinforcing part and the sidewall of the second groove in the first direction is w4, 0 < w4 ≤ D / 2. Preferably, the protrusion height of the reinforcing part in the second direction is h, where 0.08mm ≤ h ≤ 0.21mm.

[0006] Preferably, the reinforcing part is formed as a ring structure, and the thickness of the inner ring wall and the outer ring wall of the reinforcing part in the first direction is w5, where 0.1mm≤w5≤0.3mm. Preferably, it further includes: An insulating element is sandwiched between the pressure relief element and the connecting element, and at least a portion of the insulating element is in contact with the surface of the first boss facing the inside of the battery. In a first direction, the insulating element is spaced apart from the sidewall of the first boss. Preferably, it further includes: A sealing element is provided around the circumferential sidewall of the pressure relief element. Before the battery cap is assembled with the housing, one end of the sealing element protrudes from the surface of the top cover facing the outside of the battery in a second direction, and the other end protrudes from the surface of the connector facing the inside of the battery.

[0007] The second aspect of this utility model provides a battery, including the battery cap described in any of the above technical solutions.

[0008] Compared with the prior art, the beneficial effects of this utility model are as follows: The battery cap of this utility model has a pressure relief component located on the side of the top cover facing the inside of the battery. The pressure relief component has a first protrusion protruding towards the inside of the battery, and a second protrusion protruding towards the inside of the battery on the first protrusion. A first groove is formed on the surface of the pressure relief component facing away from the first protrusion. During battery thermal runaway, the gas inside the battery will push the first protrusion towards the top cover. A connecting component is located on the side of the pressure relief component facing the inside of the battery and is connected to the second protrusion. The minimum distance between the sidewall of the first groove and the sidewall of the first protrusion in a first direction is w1, where 0.07mm ≤ w1 ≤ 0.1mm, thus ensuring assembly... While ensuring strength, it also allows the first protrusion to disconnect from the main body of the pressure relief component under the action of internal gas pressure in the battery, thereby opening the pressure relief component and ensuring battery safety performance. This eliminates the need to create grooves on the pressure relief component to reduce its thickness, improving processing efficiency and product yield, and reducing production costs. In the second direction, the thickness of the part of the pressure relief component that contacts the side of the top cover facing the inside of the battery is w2, 0.2mm≤w2≤0.4mm. This ensures the structural strength of the pressure relief component, prevents deformation of the pressure relief component under impact that could cause premature opening, and also prevents the w2 dimension from being too large, which could affect the battery capacity.

[0009] 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

[0010] 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.

[0011] Figure 1 This is a schematic diagram of the structure of the battery cap provided in an embodiment of the present utility model; Figure 2 A schematic diagram of the battery cap provided in an embodiment of this utility model from another perspective; Figure 3 An axial sectional view of the battery cap provided in an embodiment of this utility model; Figure 4 for Figure 3 Enlarged structural diagram at point A; Figure 5 for Figure 3 A magnified structural diagram at point B in the middle.

[0012] Icons: 10-Top cover; 20-Pressure relief component; 21-First boss; 22-Second boss; 23-First groove; 30-Connector; 31-Second groove; 32-Thinning area; 33-Reinforcing part; 40-Insulating component; 50-Sealing component; D1-First direction; D2-Second direction. Detailed Implementation

[0013] 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.

[0014] 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.

[0015] 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.

[0016] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] According to a first aspect of the present invention, a battery cap is provided, which includes a top cover 10, a pressure relief member 20, and a connector 30.

[0023] The specific structure of the battery cap according to this embodiment, as described above, will be described below.

[0024] In this embodiment, as Figures 1 to 3 As shown, the top cover 10 is formed as a plate structure. For example, when the battery is a cylindrical battery, the top cover 10 is formed as a circular plate structure. A boss is provided in the middle of the top cover 10, and an opening is provided on the circumferential side wall of the boss, so that when venting and depressurizing, the gas inside the battery can be discharged to the outside of the battery through the opening. The pressure relief component 20 is provided on the side of the top cover 10 facing the inside of the battery. The main body of the pressure relief component 20 is attached to the surface of the top cover 10 facing the inside of the battery, which is not the boss.

[0025] The pressure relief member 20 has a first protrusion 21 protruding towards the inside of the battery, and a second protrusion 22 protruding towards the inside of the battery on the first protrusion 21. A first groove 23 is formed on the surface of the pressure relief member 20 facing away from the first protrusion 21. The first protrusion 21 and the second protrusion 22 can be formed by stamping, so that the first groove 23 is also formed after stamping. The connector 30 is formed as a plate structure and is disposed on the side of the pressure relief member 20 facing the inside of the battery. It is used to connect to the tabs on the electrode assembly. The connector 30 is connected to the second protrusion 22, thus realizing circuit transmission.

[0026] In this embodiment, as Figure 3 and Figure 4 As shown, the minimum distance between the sidewall of the first groove 23 and the sidewall of the first boss 21 in the first direction D1 is w1, 0.07mm≤w1≤0.1mm. This ensures assembly strength while allowing the first boss 21 to disconnect from the main body of the pressure relief component 20 under the pressure of gas inside the battery, thus enabling the pressure relief component 20 to open and ensuring battery safety. This eliminates the need to create grooves on the pressure relief component 20 to reduce its thickness, improving processing efficiency and product yield, and reducing production costs. Compared to existing explosion-proof valve structures, this application ensures that the pressure relief component 20 can open smoothly in the event of thermal runaway without reducing its thickness.

[0027] In this embodiment, the size of the first boss 21 in the first direction D1 is greater than the size of the first groove 23 in the first direction D1, which is greater than the size of the second boss 22 in the first direction D1.

[0028] Furthermore, the depth dimension of the portion of the pressure relief component 20 that contacts the side of the top cover 10 facing the inside of the battery in the second direction D2 is w2, i.e., as shown in the figure. Figure 4The distance between the portion of the pressure relief component 20 that contacts the surface of the top cover 10 facing the inside of the battery and the portion of the pressure relief component 20 that contacts the surface of the insulating component 40 facing the outside of the battery in the second direction D2 is w2, 0.2mm≤w2≤0.4mm. This ensures the structural strength of the pressure relief component 20, prevents the pressure relief component 20 from deforming under impact and causing it to open prematurely, and also prevents the size of w2 from being too large and affecting the battery capacity.

[0029] It should be noted that in this embodiment, when the battery is a cylindrical battery, the first direction D1 is the radial direction of the battery, and the second direction D2 is the axial direction of the battery.

[0030] Furthermore, in this embodiment, as Figure 3 As shown, the connector 30 has a second groove 31 formed on its surface facing the inside of the battery, which forms a thinning area 32 on the connector 30. The pressure relief component 20 is welded to the thinning area 32 to form a welded part. The welded part can be understood as a weld mark or weld seam formed under the welding process. The welded part can be formed by through welding. The tab is installed on the outer edge of the connector 30 and spaced apart from the thinning area 32. When gas is generated inside the battery, the thinning area 32 is easily deformed under the action of gas pressure. As the pressure increases, the side wall and bottom wall of the second groove 31 can be disconnected, thereby realizing the separation between the tab and the pressure relief component 20, thereby forming the circuit fuse, realizing power failure protection, further protecting the battery, and reducing the risk of thermal runaway.

[0031] Preferably, the welding part and the sidewall of the second groove 31 are spaced apart in the first direction D1, so as to avoid the welding process affecting the connection strength between the sidewall and bottom wall of the second groove 31, causing the circuit to melt prematurely and affecting the battery's service life.

[0032] In this embodiment, the dimension of the surface where the second boss 22 connects to the connector 30 in the first direction D1 is smaller than the dimension of the second groove 31 in the first direction D1. The center lines of the first boss 21, the second boss 22, the first groove 23, and the second groove 31 in the second direction D2 are collinear.

[0033] Furthermore, in this embodiment, as Figure 3 and Figure 5 As shown, the thickness dimension of the thinning region 32 in the second direction D2 is w3, 0.05mm≤w3≤0.07mm, in order to avoid premature circuit melting and effectively prevent further thermal runaway reaction.

[0034] In a preferred embodiment, such as Figure 3 and Figure 5As shown, a reinforcing part 33 protruding from the bottom wall of the second groove 31 toward the inside of the battery is formed in the second groove 31, which improves the structural strength of the thinning area 32 to a certain extent, protects the thinning area 32, and prevents failure during assembly.

[0035] Specifically, in this embodiment, such as Figure 5 As shown, the width dimension of the second groove 31 in the first direction D1 is D; the minimum distance between the reinforcing part 33 and the side wall of the second groove 31 in the first direction D1 is w4, 0 < w4 ≤ D / 2, thus ensuring the reinforcing effect on the thinning area 32 while avoiding the failure of the circuit fuse protection.

[0036] Preferably, in this embodiment, such as Figure 5 As shown, the protrusion height of the reinforcing part 33 in the second direction D2 is h, 0.08mm≤h≤0.21mm, which ensures the reinforcing effect of the reinforcing part 33 and avoids interference between the reinforcing part 33 and the electrode assembly or affects the energy density of the battery.

[0037] In this embodiment, the reinforcing part 33 does not extend beyond the second groove 31.

[0038] Preferably, in this embodiment, such as Figure 5 As shown, the reinforcing part 33 is formed as a ring structure. The thickness of the inner ring wall and the outer ring wall of the reinforcing part 33 in the first direction D1 is w5, 0.1mm≤w5≤0.3mm. This ensures that the connector 30 can break normally and provides effective reinforcement and protection to the thinned area 32. It should be noted that, as Figure 2 As shown, the connector 30 has a through hole, which allows the gas generated by thermal runaway to pass through the through hole and act on the pressure relief component 20.

[0039] In this embodiment, as Figures 1 to 4 As shown, the battery cap also includes an insulating component 40 and a sealing component 50. The insulating component 40 can be made of insulating materials such as PP (polypropylene) or PPS (polyphenylene sulfide), and the sealing component 50 can be an elastic sealing ring.

[0040] Specifically, such as Figure 3 and Figure 4As shown, the insulating component 40 is sandwiched between the pressure relief component 20 and the connecting component 30. The insulating component 40 is formed into a ring structure, and the welded part is located inside the ring structure of the insulating component 40. In this way, after the battery is disconnected, it is ensured that the pressure relief component 20 is separated from the electrode tab. At least a portion of the insulating component 40 is in contact with the surface of the first protrusion 21 facing the inside of the battery, thereby effectively preventing the circuit fusion protection failure caused by the connection between the connecting component 30 and the first protrusion 21. At least a portion of the insulating component 40 is in contact with the surface of the main body of the pressure relief component 20 facing the inside of the battery, thereby effectively preventing the circuit fusion protection failure caused by the connection between the connecting component 30 and the main body of the pressure relief component 20.

[0041] In this embodiment, as Figure 4 As shown, the insulating member 40 and the side wall of the first boss 21 are spaced apart in the first direction D1, so as to avoid the insulating member 40 affecting the smooth opening of the pressure relief member 20.

[0042] Preferably, a portion of the insulating element 40 surrounds the circumferential edge of the connector 30 and is snap-fitted to the connector 30.

[0043] More specifically, the seal 50 surrounds the circumferential sidewall of the pressure relief member 20. After the battery cap is assembled with the housing, the seal 50 can be compressed to achieve a certain amount of compression, thus achieving a sealed assembly. Before the battery cap is assembled with the housing, one end of the seal 50 in the second direction D2 protrudes from the surface of the top cover 10 facing the outside of the battery. This part can be bent together with the housing so that the seal 50 is pressed against the surface of the top cover 10. The other end of the seal 50 in the second direction D2 protrudes from the surface of the connector 30 facing the inside of the battery, so as to play a supporting and positioning role after the battery cap is assembled with the housing.

[0044] According to the present invention, a pressure relief component is provided on the side of the top cover facing the inside of the battery. A first protrusion protruding towards the inside of the battery is formed on the pressure relief component, and a second protrusion protruding towards the inside of the battery is formed on the first protrusion. A first groove is formed on the surface of the pressure relief component facing away from the first protrusion. During battery thermal runaway, the gas inside the battery will push the first protrusion towards the direction closer to the top cover. A connecting component is provided on the side of the pressure relief component facing the inside of the battery and is connected to the second protrusion. The minimum distance between the sidewall of the first groove and the sidewall of the first protrusion in a first direction is w1, where 0.07mm ≤ w1 ≤ 0.1mm, thus ensuring... While ensuring assembly strength, it also allows the first boss to disconnect from the main body of the pressure relief component under the action of internal gas pressure in the battery, thereby enabling the pressure relief component to open and ensuring battery safety performance. This eliminates the need to create grooves on the pressure relief component to reduce its thickness, improving processing efficiency and product yield, and reducing production costs. In the second direction, the thickness of the part of the pressure relief component that contacts the side of the top cover facing the inside of the battery is w2, 0.2mm≤w2≤0.4mm. This ensures the structural strength of the pressure relief component, prevents deformation of the pressure relief component under impact that could cause premature opening, and also prevents the w2 dimension from being too large, which could affect the battery capacity.

[0045] 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 casing. The battery processing efficiency and product yield are improved, and the production cost is reduced.

[0046] 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 first protrusion protruding towards the inside of the battery is formed on the pressure relief component, and a second protrusion protruding towards the inside of the battery is formed on the first protrusion. A first groove is formed on the surface of the pressure relief component facing away from the first protrusion. A connector is disposed on the side of the pressure relief member facing the inside of the battery and is connected to the second boss; The minimum distance between the sidewall of the first groove and the sidewall of the first boss in the first direction is w1, 0.07mm≤w1≤0.1mm; In the second direction, the thickness of the portion of the pressure relief component that contacts the side of the top cover facing the inside of the battery is w2, where 0.2mm≤w2≤0.4mm.

2. The battery cap according to claim 1, characterized in that, The connector has a second groove formed on its surface facing the inside of the battery, which creates a thinning area on the connector. The pressure relief component is welded to the thinning area to form a welded portion, which is spaced apart from the sidewall of the second groove in a first direction.

3. The battery cap according to claim 2, characterized in that, The thickness dimension of the thinning region in the second direction is w3, where 0.05mm≤w3≤0.07mm.

4. The battery cap according to claim 2, characterized in that, The second groove has a reinforcing portion that protrudes from the bottom wall of the second groove toward the inside of the battery.

5. The battery cap according to claim 4, characterized in that, The width dimension of the second groove in the first direction is D; the minimum distance between the reinforcing part and the sidewall of the second groove in the first direction is w4, 0 < w4 ≤ D / 2.

6. The battery cap according to claim 4, characterized in that, The protrusion height of the reinforcing part in the second direction is h, where 0.08mm ≤ h ≤ 0.21mm.

7. The battery cap according to claim 4, characterized in that, The reinforcing part is formed into a ring structure, and the thickness of the inner ring wall and the outer ring wall of the reinforcing part in the first direction is w5, 0.1mm≤w5≤0.3mm.

8. The battery cap according to claim 1, characterized in that, Also includes: An insulating element is sandwiched between the pressure relief element and the connecting element, and at least a portion of the insulating element is in contact with the surface of the first boss facing the inside of the battery. In a first direction, the insulating element is spaced apart from the sidewall of the first boss.

9. The battery cap according to claim 1, characterized in that, Also includes: A sealing element is provided around the circumferential sidewall of the pressure relief element. Before the battery cap is assembled with the housing, one end of the sealing element protrudes from the surface of the top cover facing the outside of the battery in a second direction, and the other end protrudes from the surface of the connector facing the inside of the battery.

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

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