Anti-explosion valve protection patch, battery cover plate assembly and lithium battery

Abstract

The utility model relates to the technical field of batteries, in particular to an anti-explosion valve protection patch, a battery cover plate assembly and a lithium battery. The explosion-proof valve protection patch comprises a patch body and a protection sleeve, one end of the protection sleeve is connected to an explosion-proof valve through hole of the battery cover plate, the patch body is installed in the end, away from the battery cover plate, of the protection sleeve, a flow guide groove is formed in the outer side wall, located outside the battery cover plate, of the protection sleeve, and the flow guide groove is annularly formed in the circumferential direction of the protection sleeve. Therefore, when the electrolyte is injected into the battery and the battery cover plate where the anti-explosion valve is located is located below the battery, the electrolyte and the patch body can be isolated and protected through the diversion trenches in the outer side wall of the protective sleeve, the overflowed electrolyte is prevented from making contact with the patch body, and then the patch body is prevented from falling off.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular to an explosion-proof valve protection patch, a battery cover assembly and a lithium battery. Background Art

[0002] For lithium-ion batteries, the explosion-proof valve is an important guarantee for the safety of the battery cell and an indispensable part of the battery cell structure. The explosion-proof valve is generally installed on the battery cell cover plate. When a large amount of gas is generated inside the battery cell, causing the internal pressure of the battery cell to be too high, the explosion-proof valve can pop out to release the gas inside the battery cell, avoiding the explosion of the battery cell.

[0003] During the assembly and transportation of the battery cell, in order to avoid bumping and damaging the explosion-proof valve, an explosion-proof valve patch is usually installed at the explosion-proof valve. When the battery cell is filled with liquid, the battery cell is usually placed vertically. At this time, the explosion-proof valve is located on the cover plate below the battery cell, and the explosion-proof valve patch is located below the explosion-proof valve. However, during the liquid injection process, the electrolyte often overflows, causing the electrolyte to flow down to the explosion-proof valve patch, resulting in the failure and falling off of the explosion-proof valve patch, and then corroding the explosion-proof valve, causing the explosion-proof valve to fail and posing a safety hazard to the battery. Summary of the Utility Model

[0004] The purpose of the present utility model is to provide an explosion-proof valve protection patch, a battery cover assembly and a lithium battery, so as to solve to a certain extent the technical problem that the explosion-proof valve protection patch in the prior art is prone to failure and falling off.

[0005] The first aspect of the present utility model provides an explosion-proof valve protection patch, including a patch body and a protective sleeve;

[0006] Both ends of the protective sleeve are open. One end of the protective sleeve is used to be connected to the explosion-proof valve through hole of the battery cover plate, and the patch body is installed inside the other end of the protective sleeve;

[0007] A diversion groove is formed on the outer side wall of the protective sleeve located outside the battery cover plate, and the diversion groove is arranged circumferentially around the protective sleeve.

[0008] Further, a first stepped portion is formed on the inner side wall of the end of the protective sleeve where the patch body is installed. The first stepped portion includes a first stepped surface, which is perpendicular to the axial direction of the protective sleeve, and the edge of the patch body is bonded to the first stepped surface.

[0009] Further, a second stepped portion is formed on the inner side wall of the explosion-proof valve through hole. The second stepped portion includes a second stepped surface, which is perpendicular to the axial direction of the explosion-proof valve through hole, and the end of the protective sleeve abuts against the second stepped surface.

[0010] Further, the end of the protective cover is adhesively bonded to the second stepped surface.

[0011] Further, a hook is provided at one end of the protective cover away from the patch body, and a slot is provided on the inner side wall of the explosion-proof valve through hole, and the hook is clamped in the slot.

[0012] Further, the number of the hooks is multiple, and the multiple hooks are arranged at intervals in the circumferential direction of the protective cover;

[0013] The number of the slots is multiple, and the multiple slots correspond to the multiple hooks one by one; or, the slots are annular in the circumferential direction around the explosion-proof valve through hole, and the multiple hooks are all clamped in the slots.

[0014] Further, the number of the diversion grooves is multiple, and the multiple diversion grooves are arranged at intervals in the axial direction of the protective cover.

[0015] Further, the protective cover is a high-temperature resistant plastic protective cover.

[0016] A second aspect of the present invention provides a battery cover assembly, including the explosion-proof valve protection patch according to any one of the above.

[0017] A third aspect of the present invention provides a lithium battery, including the battery cover assembly.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] The explosion-proof valve protection patch provided by the present invention includes a patch body and a protective cover. One end of the lithium battery is provided with a battery cover, and an explosion-proof valve through hole is opened on the battery cover. One end of the explosion-proof valve through hole faces the inside of the battery and is used for installing an explosion-proof valve. One end of the protective cover is connected to the end of the explosion-proof valve through hole away from the explosion-proof valve, and the patch body is installed inside the end of the protective cover away from the battery cover. Thus, the patch body is installed at the explosion-proof valve through hole through the protective cover to cover and hide the explosion-proof valve, avoiding bump damage to the explosion-proof valve. A diversion groove is opened on the outer side wall of the protective cover located outside the battery cover, and the diversion groove is annularly arranged in the circumferential direction of the protective cover. Thus, when injecting electrolyte into the battery and the battery cover where the explosion-proof valve is located is below the battery, through the diversion groove on the outer side wall of the protective cover, the electrolyte and the patch body can be isolated and protected, avoiding the overflowing electrolyte from contacting the patch body, and further avoiding the patch body from falling off.

[0020] The present invention also provides a battery cover assembly and a lithium battery including the battery cover assembly. The battery cover assembly includes the explosion-proof valve protection patch, so the battery cover assembly and the lithium battery also have the beneficial effects of the explosion-proof valve protection patch. Description of the Drawings

[0021] To more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is an exploded view of the explosion-proof valve protection patch provided by the embodiment of the present utility model on the battery cover;

[0023] Figure 2 It is a cross-sectional view of the explosion-proof valve protection patch provided by the embodiment of the present utility model on the battery cover;

[0024] Figure 3 It is a cross-sectional view of the protective cover provided by the embodiment of the present utility model.

[0025] Reference numerals:

[0026] 1 - Battery cover, 2 - Explosion-proof valve through-hole, 3 - Explosion-proof valve, 4 - Protective cover, 41 - Flow guide groove, 42 - Hook, 43 - First stepped surface, 5 - Patch body. Specific embodiments

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some, rather than all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application to be protected, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0028] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationships indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, or the orientation or positional relationships in which the utility model product is usually placed during use. These are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0029] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0030] In the description of the embodiments of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the connection inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

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

[0032] For ease of description, spatial relationship terms such as "above...", "upper part", "below...", and "lower part" can be used here to describe the relationship between one element and another as shown in the drawings. Such spatial relationship terms are intended to include different orientations of the device during use or operation in addition to the orientation depicted in the drawings.

[0033] The terms used herein are only for describing various examples and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. The terms "comprises", "comprising", and "having" enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof that exist, but do not preclude the existence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

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

[0035] The features of the examples described herein can be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application. Additionally, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0036] The following refers to Figures 1 to 3 Describe an explosion-proof valve protection patch, a battery cover assembly, and a lithium battery according to some embodiments of the present application.

[0037] The first aspect of the present application provides an explosion-proof valve protection patch, as Figures 1 to 3 shown, the explosion-proof valve protection patch includes a patch body 5 and a protective sleeve 4.

[0038] An end of the lithium battery is provided with a battery cover 1, an explosion-proof valve through hole 2 is opened on the battery cover 1, one end of the explosion-proof valve through hole 2 faces the inside of the battery and is used for installing an explosion-proof valve 3, one end of the protective sleeve 4 is connected to the end of the explosion-proof valve through hole 2 away from the explosion-proof valve 3, and the patch body 5 is installed inside the end of the protective sleeve 4 away from the battery cover 1, so that the patch body 5 is installed at the explosion-proof valve through hole 2 through the protective sleeve 4 to cover and hide the explosion-proof valve 3 and prevent the explosion-proof valve 3 from being knocked and damaged.

[0039] A flow guiding groove 41 is opened on the outer side wall of the protective sleeve 4 located outside the battery cover 1, and the flow guiding groove 41 is arranged in a ring shape around the circumference of the protective sleeve 4. Thus, when injecting electrolyte into the battery and the battery cover 1 where the explosion-proof valve 3 is located is below the battery, through the flow guiding groove 41 on the outer side wall of the protective sleeve 4, the electrolyte and the patch body 5 can be isolated and protected, preventing the overflowing electrolyte from contacting the patch body 5 and further preventing the patch body 5 from falling off.

[0040] In this embodiment, preferably, the number of the flow guiding grooves 41 is multiple, and the multiple flow guiding grooves 41 are arranged at intervals along the axial direction of the protective sleeve 4, so as to improve the flow guiding and isolating effect on the electrolyte through the multiple flow guiding grooves 41 and prevent the electrolyte from flowing down to the patch body 5 and causing the patch body 5 to fall off.

[0041] In an embodiment of the present application, preferably, as Figure 2 and Figure 3As shown, on the inner side wall of one end of the protective sleeve 4 for installing the patch body 5, a first stepped portion is formed. The first stepped portion includes a first stepped surface 43 perpendicular to the axial direction of the protective sleeve 4. The patch body 5 can be placed inside the protective sleeve 4, and the edge of the patch body 5 is bonded to the first stepped surface 43, thereby installing the patch body 5 inside the protective sleeve 4.

[0042] A predetermined distance is spaced between the first stepped surface 43 and the port of the protective sleeve 4. When the patch body 5 is bonded to the first stepped surface 43, the patch body 5 is also spaced a predetermined distance from the port of the protective sleeve 4, so that the patch body 5 will not leak out of the protective sleeve 4, enabling the protective sleeve 4 and the flow guiding groove 41 on the protective sleeve 4 to effectively isolate the electrolyte, and the electrolyte overflowing during battery liquid injection will not contact the patch body 5.

[0043] Meanwhile, when welding the battery cover plate 1 to the housing of the lithium battery, the protective sleeve 4 can play a certain heat insulation effect to a certain extent to block the heat transfer at the welding part to the patch body 5, avoiding the edge of the patch body 5 from melting due to high temperature and avoiding the adhesive between the patch body 5 and the first iron part from failing and causing the patch body 5 to fall off.

[0044] In an embodiment of the present application, preferably, as Figure 2 shown, on the inner side wall of the end of the explosion-proof valve through hole 2 far from the explosion-proof valve 3, a second stepped portion is formed. The second stepped portion includes a second stepped surface perpendicular to the axial direction of the explosion-proof valve through hole 2. When the protective sleeve 4 is connected to the explosion-proof valve through hole 2, the end of the protective sleeve 4 can be inserted into the explosion-proof valve through hole 2, and the end of the protective sleeve 4 can abut against the second stepped surface, thereby limiting the installation depth of the protective sleeve 4 in the explosion-proof valve through hole 2 through the second stepped surface.

[0045] In this embodiment, preferably, when installing the protective sleeve 4 at the explosion-proof valve through hole 2, the end of the protective sleeve 4 inserted into the explosion-proof valve through hole 2 is bonded to the second stepped surface.

[0046] Or, as Figure 2 and Figure 3 shown, the end of the protective sleeve 4 inserted into the explosion-proof valve through hole 2 is provided with a hook 42, and a clamping groove is provided on the inner side wall of the explosion-proof valve through hole 2. The hook 42 is clamped in the clamping groove, so that the protective sleeve 4 is clamped in the explosion-proof valve through hole 2.

[0047] Preferably, the protective sleeve 4 is provided with a plurality of hooks 42, and the plurality of hooks 42 are arranged at intervals along the circumferential direction of the protective sleeve 4; a plurality of clamping grooves are formed on the inner side wall of the explosion-proof valve through hole 2, and the plurality of hooks 42 are respectively clamped in the plurality of clamping grooves.

[0048] Alternatively, the card slot is annular around the circumferential direction of the explosion-proof valve through-hole 2, and multiple hooks 42 can be all clamped in the annular card slot, so that the protective sleeve 4 is stably clamped at the explosion-proof valve through-hole 2 through the multiple hooks 42.

[0049] In an embodiment of the present application, preferably, the protective sleeve 4 is a high-temperature resistant plastic protective sleeve 4; for example, the material of the protective sleeve 4 is PPS (polyphenylene sulfide), LCP (liquid crystal polymer), PTFE (polytetrafluoroethylene), etc. Thus, when welding the battery cover plate 1 and the battery housing, it can avoid the influence of high temperature on the protective sleeve 4, and can also play a good heat insulation role for the patch body 5 through the protective sleeve 4.

[0050] The second aspect of the present application provides a battery cover plate assembly, and the battery cover plate assembly includes the explosion-proof valve protection patch of any one of the above embodiments. Therefore, the battery cover plate assembly has all the beneficial effects of the explosion-proof valve protection patch, and will not be described in detail herein one by one.

[0051] The third aspect of the present application provides a lithium battery, and the lithium battery includes the above battery cover plate assembly. Therefore, the lithium battery also has all the beneficial effects of the explosion-proof valve protection patch, and will not be described in detail herein one by one.

[0052] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it is still possible to modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An explosion-proof valve protection patch, characterized in that: Including the patch body and protective cover; Both ends of the protective cover are open, one end of the protective cover is used to connect to the explosion-proof valve through hole of the battery cover, and the patch body is installed inside the other end of the protective cover; The outer side wall of the protective cover located outside the battery cover is provided with a guide groove, and the guide groove is arranged around the circumference of the protective cover.

2. The explosion-proof valve protection patch according to claim 1, characterized in that: The inner side wall of one end of the protective cover on which the patch body is mounted is formed with a first step portion, the first step portion includes a first step surface, the first step surface is perpendicular to the axial direction of the protective cover, and the edge of the patch body is bonded to the first step surface.

3. The explosion-proof valve protection patch according to claim 1, characterized in that: The inner side wall of the explosion-proof valve through hole is formed with a second step portion, the second step portion includes a second step surface, the second step surface is perpendicular to the axial direction of the explosion-proof valve through hole, and the end of the protective sleeve abuts against the second step surface.

4. The explosion-proof valve protection patch according to claim 3, characterized in that: The end of the protective cover is bonded to the second step surface.

5. The explosion-proof valve protection patch according to claim 1, characterized in that: A hook is provided at one end of the protective cover away from the patch body, a slot is provided on the inner side wall of the explosion-proof valve through hole, and the hook is locked in the slot.

6. The explosion-proof valve protection patch according to claim 5, characterized in that: There are multiple hooks, and the multiple hooks are arranged at intervals around the circumference of the protective sleeve; There are multiple slots, and the multiple slots correspond to the multiple hooks one by one; or, the slot is annular around the circumference of the explosion-proof valve through hole, and the multiple hooks are all clamped in the slot.

7. The explosion-proof valve protection patch according to claim 1, characterized in that: There are multiple guide grooves, and the multiple guide grooves are arranged at intervals along the axial direction of the protective sleeve.

8. The explosion-proof valve protection patch according to claim 1, characterized in that: The protective cover is a high temperature resistant plastic protective cover.

9. A battery cover assembly, characterized in that: An explosion-proof valve protection patch comprising any one of claims 1 to 8.

10. A lithium battery, characterized in that: Includes the battery cover assembly as described in claim 9.

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