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; the connecting piece is connected with one side, facing the interior of the battery, of the pressure relief piece in a welding manner to form a welding part; a sunken thinning groove is formed in one side, facing the interior of the battery, of the connecting piece; in the radial direction of the battery cap, the minimum distance between the thinning groove and the welding part is L, and L is larger than or equal to 2mm and smaller than or equal to 8mm. According to the utility model, the thinning grooves can play a role in eliminating welding stress; the minimum distance L between the thinning groove and the welding part is limited to be larger than or equal to 2 mm, it is guaranteed that welding heat influence cannot cause deformation of the connecting piece, the situation that power is cut off in advance in the battery is avoided, it is guaranteed that the connecting piece can be smoothly disconnected from the pressure relief piece before the pressure relief piece is opened by limiting L to be smaller than or equal to 8 mm, and the use performance and the service life of the battery meet the use requirements.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially is related to a battery cap and battery. BACKGROUND

[0002] Cylindrical batteries are widely used in electronic products, power tools, energy storage power supplies and power supplies. The current cylindrical battery shell generally includes a cap and a shell, wherein the cap has an explosion-proof safety function, the cap includes a top cover, a hole plate, an insulating ring, a sealing ring and an explosion-proof sheet, the hole plate and the explosion-proof sheet are welded together, and the internal pressure of the battery can cause the explosion-proof sheet to be lifted outward, so that the explosion-proof sheet is separated from the hole plate, thereby realizing the disconnection of the internal circuit of the battery to achieve power-off before the explosion-proof sheet is opened. The stress generated by the welding of the hole plate and the explosion-proof sheet can easily cause the hole plate to deform, so that the explosion-proof sheet and the hole plate are separated even when the internal pressure of the battery is lower than the set power-off pressure, which cannot guarantee the performance and service life of the battery. SUMMARY

[0003] Therefore, the purpose of the present application is to provide a battery cap and battery to solve the problem that the stress generated by the welding of the hole plate and the explosion-proof sheet in the existing battery cap can easily cause the hole plate to deform, causing the battery to power off prematurely and affecting the performance and service life of the battery.

[0004] The utility model discloses a battery cap in the first aspect, wherein it comprises:

[0005] a top cover;

[0006] a pressure relief component arranged on the side of the top cover facing the inside of the battery;

[0007] a connecting component welded to the side of the pressure relief component facing the inside of the battery to form a welded portion; the side of the connecting component facing the inside of the battery is provided with a recessed thinning groove; in the radial direction of the battery cap, the minimum distance between the thinning groove and the welded portion is L, and 2mm≤L≤8mm.

[0008] Preferably, the thinning groove is formed in an annular structure surrounding the welded portion.

[0009] Preferably, the welded portion is formed in an annular structure, and the thinning groove is coaxially arranged with the welded portion.

[0010] Preferably, the side of the connecting component facing the inside of the battery is provided with a recessed connecting groove, and the thinning groove is arranged at the groove bottom of the connecting groove.

[0011] Preferably, the side of the connecting component facing the outside of the battery is provided with a protruding first boss, and the first boss is connected with the pressure relief component.

[0012] Preferably, a second protrusion is arranged on the side of the pressure relief member facing the inside of the battery, and the second protrusion is connected with the connecting member.

[0013] Preferably, a vent hole is arranged on the connecting member, and a mounting portion connected with the tab is arranged on the side of the connecting member facing the inside of the battery, and the mounting portion is arranged between the vent hole and the thinning groove in the radial direction of the battery cap.

[0014] Preferably, a notch groove is arranged on the pressure relief member, and the projection of the vent hole on the pressure relief member covers at least part of the notch groove in the axial direction of the battery cap.

[0015] Preferably, the battery cap further comprises:

[0016] An insulating member is arranged between the connecting member and the pressure relief member in the axial direction of the battery cap.

[0017] The second aspect of the utility model provides a battery comprising the battery cap of any one of the above technical solutions.

[0018] Compared with the prior art, the utility model has the advantages of:

[0019] The battery cap has the advantages that the pressure relief member is arranged on the side of the top cover facing the inside of the battery, the connecting member and the side of the pressure relief member facing the inside of the battery are welded to form a welding portion, the side of the connecting member facing the inside of the battery is provided with a recessed thinning groove to eliminate welding stress, the minimum distance between the thinning groove and the welding portion in the radial direction of the battery cap is L, and 2mm<=L<=8mm, so that the welding heat effect does not cause deformation of the connecting member, the situation of early power-off in the inside of the battery is avoided, the connecting member and the pressure relief member are smoothly disconnected before the pressure relief member is opened, and the service performance and the service life of the battery meet the use requirements.

[0020] Therefore, the situation of early power-off in the inside of the battery is avoided, the performance of the battery is ensured, and the service life of the battery is improved.

[0021] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0023] Figure 1 A structure schematic view of the battery cap is provided for the embodiment of the utility model.

[0024] Figure 2 An axial cross-section view of the battery cap is provided for the embodiment of the utility model.

[0025] Figure 3 A structure schematic view of the connecting piece in the battery cap is provided for the embodiment of the utility model.

[0026] Icon: 10 - top cover; 20 - pressure relief piece; 21 - score groove; 22 - second boss; 30 - connecting piece; 31 - thinning groove; 32 - connecting groove; 33 - first boss; 34 - vent hole; 35 - mounting portion; 40 - welding portion; 50 - insulating piece; 60 - sealing piece. DETAILED DESCRIPTION

[0027] The following detailed description is presented to aid the reader in gaining a comprehensive understanding of the methods, apparatuses, and / or systems described herein. However, various changes, modifications, and equivalents can be used, and the

[0028] The features described herein can be implemented in different forms and should not be construed as limited to the examples described herein. Rather, these examples have been provided so that this disclosure will be thorough and complete, and will fully convey the scope of the methods, apparatuses, and / or systems to those skilled in the art. Further, the description should not be interpreted as implying that any particular element, feature, structure, or characteristic is essential.

[0029] Throughout the specification, when an element (such as a layer, region, or substrate) is referred to as being "on", "connected to", "coupled to", "bonded to" or "covering" another element, it can be directly on, connected to, coupled to, bonded to, or covering the other element, or one or more other elements can be interposed therebetween. In contrast, when an element is referred to as being "directly on", "directly connected to", "directly coupled to", "directly bonded to", "directly on", or "directly covering" another element, there are no other elements interposed therebetween.

[0030] As used herein, the term "and / or" includes any one and any combination of the associated items.

[0031] Although terms such as "first", "second", and "third" can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, elements, components, regions, layers and / or sections referred to as a first element, component, region, layer or section in the examples described herein can also be referred to as a second element, component, region, layer or section without departing from the teachings of the examples.

[0032] For ease of description, spatial relationship terms, such as "on", "upper", "under", and "lower", can be used herein to describe the relationship between one element and another element as shown in the drawings. Such spatial relationship terms are intended to encompass different orientations of the device in use or operation, in addition to the orientation depicted in the drawings. For example, if the device in the drawings is turned over, an element described as on "upper" or "upper" relative to another element would then be oriented "under" or "lower" relative to the other element. Accordingly, the term "on" encompasses both an "on" and "under" orientation based on the spatial orientation of the device. The device can be oriented in other ways (e.g., rotated 90 degrees or at other orientations) and an appropriate re-interpretation of the spatial relationship terms used herein will be made.

[0033] The terms used herein are only used to describe various examples and not to limit the present disclosure. The singular form is intended to include the plural form unless the context clearly indicates otherwise. The terms "include", "comprise" and "have" list the stated features, numbers, operations, components, elements and / or combinations thereof, but do not exclude the presence or addition of one or more other features, numbers, operations, components, elements and / or combinations thereof.

[0034] Due to manufacturing techniques and / or tolerances, variations in shapes shown in the drawings can occur. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings, but include variations in shapes that occur during manufacturing.

[0035] The features of the examples described herein can be combined in various ways as will be apparent after the disclosure of the present application is understood. Also, although the examples described herein have various configurations, other configurations are possible as will be apparent after the disclosure of the present application is understood.

[0036] The battery cap according to the first aspect of the utility model comprises a top cover 10, a pressure relief piece 20 and a connecting piece 30.

[0037] Hereinafter, the specific structure of the battery cap according to the embodiment will be described.

[0038] In the embodiment, as shown in the drawings, Figures 1 to 3 The top cover 10 is formed into a plate structure, for example, a circular plate structure, and the top cover 10 is provided with an opening hole to realize the communication between the inside and outside of the battery when the pressure relief piece 20 is opened, so as to realize the exhaust pressure relief; the pressure relief piece 20 is arranged on the side of the top cover 10 facing the inside of the battery, and the pressure relief piece 20 is welded to the top cover 10, and the pressure relief piece 20 can be an explosion-proof valve or an explosion-proof sheet.

[0039] The connecting piece 30 is formed into a plate structure and is welded to the side of the pressure relief piece 20 facing the inside of the battery, so as to form a welding portion 40 connecting the pressure relief piece 20 and the connecting piece 30, and the welding portion 40 is a welding mark formed under the welding process; the side of the connecting piece 30 facing the inside of the battery is provided with a recessed thinning groove 31, so that the thickness of the local area of the connecting piece 30 is reduced, so as to play a role in eliminating the welding stress; specifically, in the radial direction of the battery cap, the minimum distance between the thinning groove 31 and the welding portion 40 is L, and 2mm≤L≤8mm, so as to ensure that the welding heat effect will not cause the deformation of the connecting piece 30, so as to avoid the situation that the power supply in the battery is cut off in advance, and at the same time, it can also ensure that the connecting piece and the pressure relief piece are smoothly disconnected before the pressure relief piece is opened.

[0040] It should be noted that in the embodiment, the battery cap is suitable for cylindrical batteries, so that the top cover 10, the pressure relief piece 20 and the connecting piece 30 are generally formed into a circular plate or sheet structure, and therefore the radial direction of the battery cap is the horizontal direction under the perspective view, and the axial direction of the battery cap is the vertical direction under the perspective view. Figure 2 Figure 2

[0041] In the embodiment, as shown in the drawings, Figure 2 And Figure 3 The connecting piece 30 is provided with a ventilation hole 34, so that the gas in the battery can be guided to the pressure relief piece 20 when the battery fails to produce gas, and the side of the connecting piece 30 facing the inside of the battery is formed with a mounting portion 35 connected with the tab, and the tab on the pole group can be welded to the mounting portion 35; the thinning groove 31 is arranged at the middle position of the connecting piece 30, and the ventilation hole 34 is arranged at the edge position of the connecting piece 30, and in the radial direction of the battery cap, the mounting portion 35 is arranged between the ventilation hole 34 and the thinning groove 31, so as to meet the tab assembly requirement and also reduce the risk of the tab contacting the shell.

[0042] Further, in the embodiment, as shown in the drawings, Figure 2 ​​As shown, the pressure relief member 20 is provided with a score groove 21, which can be an annular groove with an opening. When the internal pressure of the battery increases to the pressure relief threshold, the score groove 21 is cracked to open the pressure relief member 20, realizing the communication between the inside and outside of the battery, so as to discharge the gas in the battery and reduce the safety risk of explosion. In the axial direction of the battery cap, the projection of the vent hole 34 on the pressure relief member 20 covers at least part of the score groove 21, so that the pressure of the gas in the battery can directly act on the score groove 21, helping the score groove 21 to crack smoothly, ensuring timely pressure relief and improving the reliability of safety protection.

[0043] Further, in the embodiment, as shown in Figure 2 , the thinning groove 31 is formed in an annular structure, such as a circular, elliptical or polygonal annular structure, around the welding portion 40, so as to completely surround the welding portion 40, thereby improving the effect of the thinning groove 31 in eliminating welding stress and reducing the influence of welding on the shape accuracy of the connecting member 30 or the pressure relief member 20.

[0044] Preferably, the welding portion 40 is formed by a penetration welding process.

[0045] Further, in the embodiment, the welding portion 40 is formed in an annular structure, so as to ensure that the pressure relief member 20 and the connecting member 30 are firmly connected, while the thinning groove 31 is coaxially arranged with the welding portion 40, so that the thinning groove 31 can uniformly eliminate the stress generated by welding.

[0046] In the embodiment, as shown in Figure 2 , the side of the connecting member 30 facing the inside of the battery is provided with a recessed connecting groove 32, so that the thickness dimension of the area of the connecting member 30 used for connecting with the pressure relief member 20 is reduced. The penetration welding is used in the connecting groove 32 to realize the welding connection of the connecting member 30 and the pressure relief member 20, which can reduce the required welding power, thereby reducing the influence of the welding heat generated. The thinning groove 31 is arranged at the groove bottom of the connecting groove 32 to eliminate the welding stress generated at the groove bottom of the connecting groove 32.

[0047] In the embodiment, as shown in Figure 2 and Figure 3 , the side of the connecting member 30 facing the outside of the battery is provided with a protruding first boss 33, which is connected with the pressure relief member 20, so that the remaining part of the connecting member 30 except the first boss 33 is spaced apart from the pressure relief member 20, thereby ensuring that the pressure relief member 20 can be smoothly disconnected from the connecting member 30.

[0048] Further, in the embodiment, as shown in Figure 2As shown, the side of the pressure relief member 20 facing the inside of the battery is provided with a protruding second boss 22, and the second boss 22 is connected with the connecting member 30, so that the rest of the pressure relief member 20 except the second boss 22 is spaced apart from the connecting member 30, thereby ensuring that the pressure relief member 20 can be smoothly disconnected from the connecting member 30, and to some extent, reducing the impact of the shape precision of the welded pressure relief member 20, and avoiding the situation that the pressure relief member 20 is opened prematurely.

[0049] In the preferred embodiment, the connecting member 30 is provided with a first boss 33 and the pressure relief member 20 is provided with a second boss 22, and the first boss 33 and the second boss 22 are welded and connected, so that the risk of the pressure relief member 20 and the connecting member 30 being overlapped when power is needed to be disconnected is minimized.

[0050] Further, in the embodiment, as shown, Figure 2 The battery cap also includes an insulating member 50, which can be a plastic material member as long as it can achieve insulation. In the axial direction of the battery cap, the insulating member 50 is clamped between the connecting member 30 and the pressure relief member 20 to form insulation protection when the connecting member 30 and the pressure relief member 20 are disconnected, thereby reducing the risk of short circuit caused by the connecting member 30 and the pressure relief member 20 being overlapped again after power is disconnected.

[0051] In addition, in the embodiment, as shown, Figure 3 The battery cap also includes a sealing member 60, which is formed in an annular structure and surrounds the circumferential side wall of the pressure relief member 20, the top cover 10 and the connecting member 30. The sealing member 60 has elasticity and insulation, for example, an elastic sealing ring made of insulating material, so that after the battery cap is assembled with the shell, the sealing member 60 is deformed under pressure, thereby achieving sealed assembly of the battery cap and the shell and also achieving insulation protection of the shell.

[0052] According to the battery cap provided by the utility model, the pressure relief member is arranged on the side of the top cover facing the inside of the battery, the connecting member is welded and connected with the side of the pressure relief member facing the inside of the battery to form a welding portion, the side of the connecting member facing the inside of the battery is provided with a recessed thinning groove to eliminate welding stress, and the minimum distance between the thinning groove and the welding portion in the radial direction of the battery cap is L, 2mm≤L≤8mm, so that the welding heat effect does not cause the connecting member to deform, thereby avoiding the situation that the inside of the battery is disconnected prematurely, and the connecting member and the pressure relief member can be smoothly disconnected before the pressure relief member is opened.

[0053] According to the battery provided by the utility model, the battery cap is installed on the battery shell and connected with the tab in the inside of the battery shell, so that the situation that the inside of the battery is disconnected prematurely can be avoided, and the service performance and the service life of the battery can meet the use requirements.

[0054] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present application, and are used to illustrate the technical solutions of the present application, but are not limitations thereof. The protection scope of the present application is not limited thereto. Although the present 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 make modifications or easily think of changes to the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some of the technical features within the technical scope disclosed by the present application. Such modifications, changes or replacements do not cause the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A battery cap, characterized by, The battery cap cover comprises: a top cover; a pressure relief member arranged on a side of the top cover facing the inside of the battery; a connecting member welded to a side of the pressure relief member facing the inside of the battery to form a welded portion; a recessed thinning groove is arranged on a side of the connecting member facing the inside of the battery; and the minimum distance between the thinning groove and the welded portion in the radial direction of the battery cap cover is L, 2mm≤L≤8mm.

2. The battery cap of claim 1, wherein, The thinning groove is formed in an annular structure surrounding the welded portion.

3. The battery cap of claim 2, wherein, The welded portion is formed in an annular structure, and the thinning groove is coaxially arranged with the welded portion.

4. The battery cap of claim 1, wherein, A recessed connecting groove is arranged on a side of the connecting member facing the inside of the battery, and the thinning groove is arranged on the groove bottom of the connecting groove.

5. The battery cap of claim 1, wherein, A protruding first boss is arranged on a side of the connecting member facing the outside of the battery, and the first boss is connected with the pressure relief member.

6. The battery cap of claim 1 or 5, wherein, A protruding second boss is arranged on a side of the pressure relief member facing the inside of the battery, and the second boss is connected with the connecting member.

7. The battery cap of claim 1, wherein, An air hole is formed on the connecting member, a mounting portion connected with the tab is formed on a side of the connecting member facing the inside of the battery, and the mounting portion is arranged between the air hole and the thinning groove in the radial direction of the battery cap cover.

8. The battery cap of claim 7, wherein, An indentation groove is formed on the pressure relief member, and the projection of the air hole on the pressure relief member covers at least part of the indentation groove in the axial direction of the battery cap cover.

9. The battery cap of claim 1, wherein, Further comprising: an insulating member arranged between the connecting member and the pressure relief member in the axial direction of the battery cap cover.

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

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