Cover plate structure and battery

Abstract

The utility model relates to a cover plate structure and a battery, and relates to the field of new energy batteries. The utility model provides a cover plate structure. The cover plate structure comprises a cover plate and a pole, a pole hole is formed in the cover plate; the pole is in sealed connection with the pole hole, the bottom of the pole is connected with the tab, a first groove and a second groove which are communicated with each other are formed in the bottom of the pole, an elastic piece is arranged in the first groove, and a protection sheet is arranged in the second groove; one end of the elastic piece abuts against the inner wall of the first groove, and the other end of the elastic piece abuts against the protection piece. And the protection sheet is abutted against the tab. The protection sheet is arranged on the bottom surface of the pole to perform short-circuit protection on the battery; and by arranging the elastic piece, after the battery is short-circuited and the protection sheet is fused, the elastic piece restores and pushes the protection sheet away from the pole through elastic force, so that secondary lap joint after short circuit is prevented, and continuous short circuit caused by lap joint is avoided.

Description

Technical Field

[0001] The utility model relates to the field of new energy batteries, and in particular to a cover plate structure and a battery. Background Art

[0002] Current lithium-ion battery adapters are usually equipped with a short-circuit protection structure, which mainly involves drilling a hole in the middle of the adapter or setting two grooves on the edge to reduce the cross-sectional area. When a short circuit occurs, the minimum cross-sectional area will fuse and cut off the current path, thus forming short-circuit protection.

[0003] The inventors have discovered through research that there is a risk of secondary overlap between the tab and the adapter. Utility Model Content

[0004] The purpose of the utility model is to provide a cover plate structure and a battery, which can protect the battery from short circuit and prevent secondary overlap after short circuit.

[0005] The embodiment of the present utility model is achieved as follows:

[0006] In the first aspect, the utility model proposes a cover plate structure, including a cover plate and a pole; a pole hole is provided on the cover plate; the pole is sealed and connected to the pole hole, the bottom of the pole is connected to the pole ear, and the bottom of the pole is provided with a first groove and a second groove that are connected, an elastic member is provided in the first groove, and a protective sheet is provided in the second groove; one end of the elastic member abuts against the inner wall of the first groove, and the other end abuts against the protective sheet; the protective sheet abuts against the pole ear.

[0007] Optionally, the elastic member includes a spring and an insulating member, one end of the spring abuts against the inner wall of the first groove, and the other end is connected to one end of the insulating member, and the other end of the insulating member abuts against the protective sheet;

[0008] Or the elastic member includes an elastic insulating structure.

[0009] Optionally, the protective sheet is a disc structure, and a circular groove is provided at one end of the protective sheet facing the pole, and a third annular groove is provided at one end of the protective sheet away from the pole;

[0010] The circular groove is concentrically arranged with the third groove, and the diameter of the third groove is smaller than the diameter of the circular groove.

[0011] Optionally, a first annular groove is provided on an edge of one end of the protection sheet away from the pole;

[0012] The pole is provided with a second annular groove along the edge of the second groove, and the first annular groove and the second annular groove form a welding groove.

[0013] Optionally, the thickness of the protection sheet is consistent with the depth of the first groove.

[0014] Optionally, the first groove is located inside the second groove, and the first groove and the second groove are concentrically arranged.

[0015] Optionally, the cover plate structure further includes an upper plastic, a lower plastic and a sealing ring, the upper portion of the cover plate is provided with the upper plastic, the bottom portion of the cover plate is provided with the lower plastic, the upper portion of the pole is clamped with the upper plastic, and the lower portion of the pole is clamped with the lower plastic;

[0016] The pole is sealed and connected to the upper plastic, the lower plastic and the cover plate through the sealing ring.

[0017] Optionally, the pole includes a positive pole and a negative pole, and the cover plate is provided with two pole holes corresponding to the positive pole and the negative pole respectively;

[0018] The cover plate is further provided with a liquid injection hole and an explosion-proof hole, and an explosion-proof valve and an explosion-proof valve protection patch are correspondingly provided at the explosion-proof hole.

[0019] In the second aspect, the utility model proposes a battery, comprising the cover structure, bare cell and shell described in any one of the above items; the bare cell is provided with the tab; the bare cell is arranged in the shell, and the shell is sealed and connected to the cover structure.

[0020] Optionally, the battery further includes a switching plate, and the switching plate is arranged between the terminal lug and the terminal column.

[0021] The beneficial effects of the embodiments of the present utility model are:

[0022] The cover plate structure proposed by the utility model provides short-circuit protection for the battery by arranging a protective sheet on the bottom surface of the pole; and further, by arranging an elastic member, after the battery short circuit causes the protective sheet to melt, the elastic member recovers and pushes the protective sheet away from the pole through elastic force, thereby preventing secondary overlap after the short circuit and avoiding continuous short circuit caused by overlap. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is an exploded view of the cover structure of an embodiment of the present utility model;

[0025] Figure 2 This is a first structural schematic diagram of the cover plate structure according to an embodiment of the present utility model;

[0026] Figure 3 for Figure 2 A partial schematic diagram of the middle part;

[0027] Figure 4 This is a second structural schematic diagram of the cover plate structure according to an embodiment of the present utility model;

[0028] Figure 5 for Figure 4 A partial schematic diagram of B in the middle;

[0029] Figure 6 This is a top view of the cover structure of an embodiment of the utility model;

[0030] Figure 7 This is a bottom view of the cover structure of an embodiment of the present utility model.

[0031] Icons: 010-cover structure; 100-cover; 110-pole hole; 120-first liquid injection hole; 130-explosion-proof hole; 131-explosion-proof valve; 132-explosion-proof valve protection patch; 200-lower plastic; 210-first mounting hole; 220-second liquid injection hole; 230-second mounting hole; 240-support part; 310-positive pole; 311-first groove; 312-second groove; 313-second annular groove; 320-negative pole; 400-protective sheet; 410-circular groove; 420-third groove; 430-first annular groove; 431-welding groove; 500-elastic part; 510-spring; 520-insulating part; 600-upper plastic; 700-sealing ring. DETAILED DESCRIPTION

[0032] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0035] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0037] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0038] The inventors have discovered that when a short circuit occurs in an existing battery and the adapter plate melts, there is a risk of secondary connection between the tab and the adapter plate.

[0039] Among them, in order to protect the battery from short circuit, the current lithium-ion battery adapter is usually equipped with a short-circuit protection structure, which mainly involves drilling a hole in the middle of the adapter or setting two grooves on the edge to reduce the cross-sectional area, so that when a short circuit occurs, the minimum cross-sectional area will fuse and cut off the current channel, thereby forming short-circuit protection.

[0040] Among them, in order to prevent the adapter and the tab from overlapping, the current conventional method to prevent the tab from overlapping after a short circuit is usually to inject molding at the overlapping position of the adapter tab, and prevent conduction after overlapping through the insulation of the plastic part, or to reduce the tab width and change the tab center distance.

[0041] This embodiment provides a battery that can achieve short-circuit protection for the battery while avoiding secondary bonding.

[0042] In this embodiment, the battery includes a shell and a bare cell (not shown); wherein, the bare cell is provided with a tab; the bare cell is arranged in the shell, and the shell is sealed and connected to the cover plate 100.

[0043] Among them, the bare battery cell is provided with a positive electrode tab and a negative electrode tab.

[0044] Please refer to Figure 1-Figure 7 In this embodiment, the battery includes a cover structure 010 .

[0045] Please refer to Figure 1 A cover plate structure 010 proposed in this embodiment includes a cover plate 100 and a pole. The cover plate 100 is provided with a pole hole 110; the pole is sealedly connected to the pole hole 110, and the bottom of the pole is connected to the pole ear. The bottom of the pole is provided with a first groove 311 and a second groove 312 that are connected. An elastic member 500 is provided in the first groove 311, and a protective sheet 400 is provided in the second groove 312; one end of the elastic member 500 abuts against the inner wall of the first groove 311, and the other end abuts against the protective sheet 400; the protective sheet 400 abuts against the pole ear.

[0046] In this embodiment, please refer to Figure 1 and Figure 6 The cover plate 100 is a rectangular plate structure, wherein two pole holes 110 are provided on the cover plate 100 , wherein one pole hole 110 is used to install the positive pole 310 , and the other pole hole 110 is used to install the negative pole 320 .

[0047] The cover plate 100 is further provided with a first liquid injection hole 120 and an explosion-proof hole 130 ; the first liquid injection hole 120 is used to inject electrolyte, and an explosion-proof valve 131 and an explosion-proof valve protection patch 132 are correspondingly provided at the explosion-proof hole 130 .

[0048] The cover plate 100 is also provided with a reserved area for spraying the supplier mold number, GB / T code area and supplier traceability code.

[0049] In this embodiment, the cover structure 010 includes a lower plastic 200 .

[0050] In this embodiment, please refer to Figure 1 and Figure 7 The lower plastic 200 is a supporting plate structure consistent with the cover 100. The lower plastic 200 is made of plastic insulating material and is used to insulate the bare battery cell and the cover 100. Two first mounting holes 210 are provided on the lower plastic 200, one of which is used to install the positive electrode column 310, and the other is used to install the negative electrode column 320.

[0051] The lower plastic 200 is provided with a second injection hole 220. The first injection hole 120 and the second injection hole 220 are provided correspondingly and are used together to inject electrolyte.

[0052] A second mounting hole 230 is located in the middle of the lower plastic housing 200, corresponding to the first mounting hole 210. The second mounting hole 230 is used to mount the explosion-proof valve 131. A support portion 240 is located at the second mounting hole 230, with multiple corresponding ventilation holes. Support portions 240 are located at both the left and right ends of the lower plastic housing 200, with multiple hollow sections defined on the end faces. These hollow sections reduce the weight of the lower plastic housing 200.

[0053] It is understandable that the support portion 240 is provided to enable the lower plastic 200 to be supported between the bare cell and the cover plate 100 .

[0054] In this embodiment, the cover structure 010 includes a pole.

[0055] In this embodiment, please refer to Figure 1 、 Figure 2 and Figure 4 The pole includes a positive pole 310 and a negative pole 320. The positive pole 310 passes through the pole hole 110 and the first mounting hole 210 to be electrically connected to the positive electrode ear, and the negative pole 320 passes through the pole hole 110 and the first mounting hole 210 to be electrically connected to the negative electrode ear.

[0056] In this embodiment, please refer to Figure 1 Both the positive and negative electrode posts 310 and 320 are boss-type structures, consisting of a connected column and base. The square base has a circular boss on the column body. The side of the circular boss has an annular groove for injection molding. During installation, the base passes through the back of the lower plastic 200 and mates with the rectangular groove on the lower plastic 200.

[0057] In this embodiment, please refer to Figure 3 and Figure 4 The bottom of the base of the positive electrode column 310 is provided with a first groove 311 and a second groove 312 that are connected. An elastic member 500 is provided in the first groove 311, and a protective sheet 400 is provided in the second groove 312; one end of the elastic member 500 abuts against the inner wall of the first groove 311, and the other end abuts against the protective sheet 400; the protective sheet 400 abuts against the pole ear.

[0058] Please refer to Figure 3 and Figure 5The first groove 311 and the second groove 312 are both circular grooves 410. The depth of the first groove 311 is less than the depth of the second groove 312. The first groove 311 is located inside the second groove 312. The first groove 311 and the second groove 312 are concentrically arranged.

[0059] In this embodiment, the cover structure 010 includes a protection sheet 400 .

[0060] In this embodiment, please refer to Figure 1 The protective sheet 400 is a disc structure. A circular groove 410 with a circular concave structure is provided at one end of the protective sheet 400 facing the pole, and a third annular groove 420 is provided at one end of the protective sheet 400 away from the pole.

[0061] Please refer to Figure 5 , the circular groove 410 is concentrically arranged with the third groove 420, and the diameter of the third groove 420 is smaller than the diameter of the circular groove 410. It can be understood that the third groove 420 has the smallest cross-sectional area, so that the protective sheet 400 is melted in the event of a short circuit, and the protective sheet 400 is melted from the third groove 420 to the circular groove 410, so that part of the protective sheet 400 in the inner ring of the third groove 420 falls off, and the fallen protective sheet 400 is pushed away by the elastic member 500, thereby avoiding the contact between the tab or adapter of the bare battery cell and the pole, thereby achieving short circuit protection. The protective sheet 400 of the circular groove 410 and the third groove 420 is arranged in this way to avoid the contact between the tab or adapter of the bare battery cell and the pole, and also reduce the contact area between the two.

[0062] Please refer to Figure 3 , the thickness of the protection sheet 400 is consistent with the depth of the first groove 311; then the bottom surface of the protection sheet 400 is flush with the bottom surface of the pole.

[0063] It is worth mentioning that please refer to Figure 3 and Figure 5 The protective sheet 400 and the terminal are connected by welding. A first annular groove 430 is defined on the edge of the protective sheet 400 away from the terminal. A second annular groove 313 is defined along the edge of the second groove 312 of the terminal. The first annular groove 430 and the second annular groove 313 form a welding groove 431. This allows welding of the protective sheet 400 and the terminal to proceed along the welding groove 431.

[0064] In this embodiment, the cover structure 010 includes an elastic member 500 .

[0065] In this embodiment, please refer to Figure 5The elastic member 500 includes a spring 510 and an insulating member 520 . One end of the spring 510 abuts against the inner wall of the first groove 311 , and the other end is connected to one end of the insulating member 520 . The other end of the insulating member 520 abuts against the protective sheet 400 .

[0066] Optionally, the insulating member 520 is a cylindrical injection-molded member made of insulating plastic material, and the insulating member 520 can play an insulating role after a short circuit occurs.

[0067] Understandably, please refer to Figure 3 and Figure 5 When the spring 510 is installed in the first groove 311, it is in a compressed state. When the battery short-circuits, the protective sheet 400 melts, and part of the protective sheet 400 in the inner ring of the third groove 420 falls off. The spring 510 recovers and pushes the protective sheet 400 away for a distance to avoid overlapping and causing continuous short circuit, thereby achieving short-circuit protection.

[0068] Of course, in an optional embodiment, the elastic member 500 may also include an elastic insulating structure; for example, the elastic member 500 is an arc-shaped thin sheet of insulating plastic material; for example, the elastic member 500 is a spring 510 of insulating plastic material.

[0069] In this embodiment, the cover structure 010 further includes an upper plastic 600 and a sealing ring 700 .

[0070] In this embodiment, please refer to Figure 1 An upper plastic 600 is provided on the upper part of the cover plate 100, and a lower plastic 200 is provided on the bottom of the cover plate 100. The upper part of the pole is snap-fitted with the upper plastic 600, and the lower part of the pole is snap-fitted with the lower plastic 200. A sealing ring 700 is provided between the bottom of the cover plate 100 and the pole, and the pole is sealed and connected to the upper plastic 600, the lower plastic 200 and the cover plate 100 through the sealing ring 700.

[0071] In an optional embodiment, the battery further includes a switching piece (not shown), which is disposed between the terminal lug and the terminal post.

[0072] It is understood that the structure connected to the protection sheet 400 can be an adapter sheet or a tab, and the minimum cross-sectional area of ​​the connection structure is larger than the minimum cross-sectional area of ​​the short-circuit protection sheet 400. When the battery short-circuits, the protection sheet 400 fuses, and a portion of the protection sheet 400 within the inner ring of the third groove 420 falls off. The spring 510 recovers and pushes the protection sheet 400 and the adapter sheet apart for a distance to prevent overlap and a sustained short circuit, thereby achieving short-circuit protection.

[0073] The working principle of the cover structure 010 proposed in this embodiment is: when the battery is short-circuited, the protective sheet 400 melts, part of the protective sheet 400 in the inner ring of the third groove 420 falls off, and the spring 510 recovers and pushes the protective sheet 400 away for a distance to avoid overlapping and causing continuous short circuit.

[0074] In summary, the cover plate structure 010 proposed in the present invention provides short-circuit protection for the battery by providing a protective sheet 400 on the bottom surface of the pole; and also by providing an elastic member 500. When the battery short-circuits and the protective sheet 400 melts, the elastic member 500 recovers and pushes the protective sheet 400 away from the pole through elastic force, thereby preventing secondary overlap after the short circuit and avoiding continuous short circuit caused by overlap.

[0075] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A cover plate structure, characterized in that: include: A cover plate, wherein the cover plate is provided with a pole hole; A pole, wherein the pole is sealed and connected to the pole hole, the bottom of the pole is connected to the pole ear, and the bottom of the pole is provided with a first groove and a second groove in communication, an elastic member is provided in the first groove, and a protective sheet is provided in the second groove; One end of the elastic member abuts against the inner wall of the first groove, and the other end abuts against the protective sheet; The protection sheet abuts against the tab.

2. The cover plate structure according to claim 1, characterized in that: The elastic member includes a spring and an insulating member, one end of the spring abuts against the inner wall of the first groove, the other end of the spring is connected to one end of the insulating member, and the other end of the insulating member abuts against the protective sheet; Or the elastic member includes an elastic insulating structure.

3. The cover plate structure according to claim 1, characterized in that: The protective sheet is a disc structure, and a circular groove is provided on one end of the protective sheet facing the pole, and a third annular groove is provided on the other end of the protective sheet away from the pole; The circular groove is concentrically arranged with the third groove, and the diameter of the third groove is smaller than the diameter of the circular groove.

4. The cover plate structure according to claim 3, characterized in that: A first annular groove is provided on an edge of one end of the protection sheet away from the pole; The pole is provided with a second annular groove along the edge of the second groove, and the first annular groove and the second annular groove form a welding groove.

5. The cover plate structure according to claim 3, characterized in that: The thickness of the protection sheet is consistent with the depth of the first groove.

6. The cover plate structure according to claim 1, characterized in that: The first groove is located inside the second groove, and the first groove and the second groove are concentrically arranged.

7. The cover plate structure according to claim 1, characterized in that: The cover structure further includes an upper plastic, a lower plastic, and a sealing ring. The upper plastic is disposed on the upper portion of the cover, and the lower plastic is disposed on the bottom of the cover. The upper portion of the pole is clamped to the upper plastic, and the lower portion of the pole is clamped to the lower plastic. The pole is sealed and connected to the upper plastic, the lower plastic and the cover plate through the sealing ring.

8. The cover plate structure according to claim 7, characterized in that: The poles include a positive pole and a negative pole, and the cover plate is provided with two pole holes corresponding to the positive pole and the negative pole respectively; The cover plate is further provided with a liquid injection hole and an explosion-proof hole, and an explosion-proof valve and an explosion-proof valve protection patch are correspondingly provided at the explosion-proof hole.

9. A battery, characterized in that: include: The cover plate structure according to any one of claims 1 to 8; A bare battery cell, on which the tab is provided; The bare cell is arranged in the shell, and the shell is sealed and connected to the cover structure.

10. The battery according to claim 9, characterized in that The battery further includes a switching plate, which is arranged between the tab and the pole.

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