Top cover support, top cover assembly and battery

Abstract

The utility model discloses a top cover support, a top cover assembly and a battery, the top cover support is applied to the battery, the top cover support comprises two first end parts and a limiting part, and the two first end parts are oppositely arranged along the length direction of the top cover support; the limiting part is connected between the two first end parts, and the inner surface of the limiting part protrudes out of the inner surfaces of the first end parts and can abut against a naked battery cell of the battery; and the inner surface of the first end part and the naked battery core are arranged at intervals. The technical scheme of the utility model can reduce the risk that the plastic bracket extrudes the corners of the naked battery cell and the diaphragm is punctured.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a top cover bracket, a top cover component and a battery. Background Art

[0002] A lithium battery generally includes a shell, a bare cell and a top cover assembly, wherein the bare cell is arranged inside the shell, and the top cover assembly is arranged at the opening of the shell to achieve sealing and electrical connection of the bare cell. The top cover assembly generally includes a plain aluminum sheet and a plastic bracket, and the plastic bracket is arranged on the inner surface of the plain aluminum sheet. The inner surface of the plastic bracket is provided with raised structures at both ends and the middle to play a role in abutting and limiting the bare cell.

[0003] However, the corners of the bare battery cell are easily punctured by the raised structure of the plastic support, causing the diaphragm to fail the Hi-Pot test and lead to the battery being scrapped, resulting in material waste. Utility Model Content

[0004] The main purpose of the utility model is to provide a top cover bracket, aiming to reduce the risk of the plastic bracket squeezing the corners of the bare battery cell and causing the diaphragm to be pierced.

[0005] In order to achieve the above-mentioned purpose, the top cover bracket proposed by the utility model is applied to a battery, and the top cover bracket comprises:

[0006] Two first end portions are arranged opposite to each other along the length direction of the top cover support;

[0007] A limiting portion is connected between the two first end portions, wherein the inner surface of the limiting portion protrudes from the inner surface of the first end portion and can abut against the bare cell of the battery; and the inner surface of the first end portion is spaced apart from the bare cell.

[0008] Optionally, a height difference between an inner surface of the limiting portion and an inner surface of the first end portion is 0.5 mm to 5 mm.

[0009] Optionally, a height difference between an inner surface of the limiting portion and an inner surface of the first end portion is 1 mm to 2 mm.

[0010] The utility model also provides a top cover assembly, comprising a top cover body and the above-mentioned top cover bracket, wherein the top cover bracket is arranged on the top cover body.

[0011] Optionally, the battery includes a top cover assembly, which includes a top cover body and a top cover bracket connected to each other, the top cover body is provided with a liquid injection hole, the top cover bracket is provided with a buffer groove and a plurality of liquid holes connected to the buffer groove, and the notch of the buffer groove is connected to the liquid injection hole.

[0012] Optionally, the buffer groove is arranged at a limiting portion of the top cover bracket, and on a section perpendicular to a thickness direction of the top cover bracket, a cross-sectional area of ​​the buffer groove is larger than a cross-sectional area of ​​the injection hole.

[0013] Optionally, the liquid-passing hole is arranged on the bottom wall of the buffer tank and extends along the thickness direction of the top cover bracket, and the bottom wall of the buffer tank abuts against the bare cell of the battery.

[0014] Optionally, the aperture of the liquid passage hole is smaller than the aperture of the liquid injection hole.

[0015] Optionally, at least two of the liquid holes are spaced apart and distributed along the length direction of the top cover support.

[0016] Optionally, at least two of the liquid holes are spaced apart and distributed along the width direction of the top cover support.

[0017] Optionally, the top cover assembly also includes a pole connected to a bare cell of the battery, the buffer groove is arranged at the first end of the top cover bracket, and a clearance hole is provided at the second end of the top cover bracket corresponding to the pole, and one end of the pole passes through the clearance hole and is exposed to the outside.

[0018] The utility model also proposes a battery, comprising a shell, a bare cell and the aforementioned top cover assembly, wherein the shell has an installation cavity and an installation opening connected to the installation cavity, the bare cell is arranged in the installation cavity, and the top cover assembly is sealed on the installation opening.

[0019] The technical solution of the utility model can achieve the positioning and limiting effect on the bare battery cell by abutting the limiting portion on the bare battery cell, so that the bare battery cell can maintain a relative position in the installation cavity; secondly, since the inner surface of the first end portion is spaced apart from the bare battery cell, the corners of the bare battery cell are prevented from being abutted and squeezed by the top cover bracket, thereby reducing the risk of puncturing the diaphragm of the bare battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 This is a structural schematic diagram of an embodiment of the top cover bracket of the utility model;

[0022] Figure 2 It is a cross-sectional view of an embodiment of the top cover battery of the utility model.

[0023] Description of Figure Numbers:

[0024] Label name Label name 10 Top cover bracket 21 Filling hole 11 First end 31 Pole 12 Limiting part 32 Connector 13 Buffer tank 41 case 14 Liquid hole 42 Mounting cavity 15 Make way hole 43 Mounting opening 16 Mounting slot 44 Bare battery 20 Top cover body 45 Sealing nails

[0025] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0030] A lithium battery generally includes a shell, a bare cell and a top cover assembly, wherein the bare cell is arranged inside the shell, and the top cover assembly is arranged at the opening of the shell to achieve sealing and electrical connection of the bare cell. The top cover assembly generally includes a plain aluminum sheet and a plastic bracket, and the plastic bracket is arranged on the inner surface of the plain aluminum sheet. The inner surface of the plastic bracket is provided with raised structures at both ends and the middle to play a role in abutting and limiting the bare cell.

[0031] However, the corners of the bare battery cell are easily punctured by the raised structure of the plastic support, causing the diaphragm to fail the Hi-Pot test and lead to the battery being scrapped, resulting in material waste.

[0032] In view of this, the utility model proposes a top cover bracket, which is applied to the top cover assembly of the battery, please refer to Figure 2 The battery includes a shell 41 and a bare cell 44, the shell 41 has a mounting cavity 42 and a mounting opening 43 connected to the mounting cavity 42, the bare cell 44 is arranged in the mounting cavity 42, the top cover assembly is covered in the mounting opening 43, the top cover assembly includes a top cover body 20, and the top cover bracket 10 is arranged on the inner surface of the top cover body 20.

[0033] Please refer to Figure 1 to Figure 2 In one embodiment of the utility model, the top cover bracket 10 includes two first end portions 11 and a limiting portion 12. The two first end portions 11 are arranged opposite to each other along the length direction of the top cover bracket 10. The limiting portion 12 is connected between the two first end portions 11. The inner surface of the limiting portion 12 protrudes from the inner surface of the first end portion 11 and can abut against the bare battery cell 44. The inner surface of the first end portion 11 is spaced apart from the bare battery cell 44.

[0034] It should be noted that the inner surface of the above-mentioned part or structure refers to the surface of the part or structure facing the mounting cavity 42 of the shell 41 when the battery assembly production is completed. For example, the inner surface of the top cover bracket 10 is located in the mounting cavity 42, so the limiter 12 can abut against the bare battery cell 44. The inner surface of the limiter 12 protrudes from the inner surface of the first end 11, which means that in the direction in which the top cover assembly is installed into the mounting opening 43, the inner surface of the limiter 12 is higher than the inner surface of the first end surface.

[0035] The technical solution of the utility model can achieve the positioning and limiting effect on the bare battery cell 44 by abutting the limiting portion 12 against the bare battery cell 44, so that the bare battery cell 44 can maintain a relative position in the installation cavity 42; secondly, since the inner surface of the first end portion 11 is spaced apart from the bare battery cell 44, the corners of the bare battery cell 44 are prevented from being abutted and squeezed by the top cover bracket 10, thereby reducing the risk of puncturing the diaphragm of the bare battery cell 44.

[0036] Optionally, the height difference H between the inner surface of the limiting portion 12 and the inner surface of the first end portion 11 is 0.5 mm to 5 mm. Without loss of generality, the battery is also provided with a Mylar tape, and the Mylar tape is installed on the peripheral side of the top cover bracket 10, that is, part of the Mylar tape will be wrapped around the side of the first end portion 11. It can be understood that, under the premise that the height dimension of the limiting portion 12 remains unchanged, if the height difference H is set too large, the side height of the first end portion 11 will become very small, which is not conducive to the installation and fixation of the Mylar tape. If the height difference H is set too small, the inner surface of the first end portion 11 is easily squeezed to the bare battery cell 44, and the bare battery cell 44 is punctured. Preferably, the height difference between the inner surface of the limiting portion 12 and the inner surface of the first end portion 11 is 1 mm to 2 mm.

[0037] Optionally, the top cover body 20 is provided with a liquid injection hole 21, the top cover bracket 10 is provided with a buffer groove 13 and a plurality of liquid holes 14 connected to the buffer groove 13, and the notch of the buffer groove 13 is connected to the liquid injection hole 21. In this way, when the electrolyte is injected into the mounting cavity 42 through the liquid injection hole 21, the electrolyte first enters the buffer groove 13 and then flows into the mounting cavity 42 through the plurality of liquid holes 14, which can prevent the electrolyte from directly impacting the bare cell 44, resulting in a problem of slight displacement of the pole piece of the bare cell 44, thereby improving the performance of the battery.

[0038] Further optionally, the top cover assembly further includes a sealing nail 45, and the sealing nail 45 is sealingly inserted in the injection hole 21. In this way, after the electrolyte injection is completed, the injection hole 21 is blocked by the sealing nail 45, and the structure is simple and easy to implement.

[0039] Specifically, optionally, at least two liquid holes 14 are arranged along the length direction of the top cover bracket 10 (i.e. Figure 1 The at least two liquid holes 14 are spaced apart along the width direction of the top cover bracket 10 (ie, Figure 1 In this way, the impact force of the electrolyte can be further dispersed during the injection, which is beneficial to improving the infiltration efficiency of the electrolyte. Of course, in other embodiments, multiple liquid holes 14 can be arranged only in the length direction of the top cover bracket 10, or multiple liquid holes 14 can be arranged only in the width direction of the top cover bracket 10.

[0040] It should be noted that the liquid holes 14 may have various shapes and sizes, including but not limited to round holes, square holes, triangular holes or semicircular holes, etc. The shapes and sizes of the multiple liquid holes 14 may be the same or different.

[0041] Optionally, the buffer groove 13 is provided on the limiting portion 12, in a direction perpendicular to the thickness direction of the top cover bracket 10 (i.e. Figure 1On a cross-sectional plane (in the Z direction shown in the figure), the cross-sectional area of ​​the buffer groove 13 is larger than the cross-sectional area of ​​the injection hole 21. In this way, the buffer groove 13 is formed by utilizing the structure of the limiting portion 12, which is conducive to simplifying the structure of the top cover bracket 10. Secondly, the electrolyte is first injected into the buffer groove 13 with a larger cross-sectional area and volume through the injection hole 21, which can further reduce the impact force of the electrolyte. Of course, in other embodiments, the cross-sectional area of ​​the buffer groove 13 may be less than or equal to the cross-sectional area of ​​the injection hole 21, and the buffer groove 13 may be configured as a groove body with multiple continuous bends, such as an S-shaped groove body. In other embodiments, a convex portion may be additionally provided on the inner surface of the top cover bracket 10, and the buffer groove 13 and the liquid hole 14 may be provided on the convex portion.

[0042] Optionally, the liquid hole 14 is provided on the bottom wall of the buffer tank 13 and extends along the thickness direction of the top cover bracket 10, and the bottom wall of the buffer tank 13 abuts against the bare battery cell 44. In this way, the liquid hole 14 directly abuts against the bare battery cell 44, which is conducive to improving the infiltration efficiency of the electrolyte. Of course, in other embodiments, the liquid hole 14 can also be provided on the side wall of the buffer tank 13.

[0043] Optionally, the aperture of the liquid passage hole 14 is smaller than the aperture of the liquid injection hole 21. Specifically, the aperture (or cross-sectional area) of a single liquid passage hole 14 is set to two-fifths to three-fifths, for example, one-half, of the aperture (or cross-sectional area) of the liquid injection hole 21. In this way, a plurality of liquid passage holes 14 with small apertures that are evenly distributed can play a good buffering role during the electrolyte injection process.

[0044] Optionally, the top cover assembly also includes a pole 31 connected to the bare battery cell 44, and the buffer groove 13 is arranged at the first end of the top cover bracket 10. The second end of the top cover bracket 10 is provided with a clearance hole 15 corresponding to the pole 31, and one end of the pole 31 passes through the clearance hole 15 and is exposed to the outside. That is, the buffer groove 13 and the liquid hole 14 are offset at one end of the top cover bracket 10, so that the top cover assembly of this embodiment can be applied to the blade battery. Of course, in other embodiments, the two poles 31 can also be arranged at opposite ends of the top cover bracket 10, and the buffer groove 13 can be arranged in the middle of the top cover bracket 10.

[0045] Optionally, the top cover assembly further includes a connecting piece 32, and the top cover bracket 10 is provided with an embedding groove 16 corresponding to the connecting piece 32, and the connecting piece 32 is embedded in the embedding groove 16 and connected between the bare battery cell 44 and the pole 31. Further optionally, the material of the top cover body 20 is configured as aluminum, and the material of the top cover bracket 10 is configured as plastic.

[0046] The utility model also provides a top cover assembly, which includes a top cover body and a top cover bracket. The specific structure of the top cover bracket refers to the above embodiment. Since the top cover assembly adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Wherein, the top cover bracket is arranged on the top cover body.

[0047] The utility model also proposes a battery, including a shell, a bare cell and a top cover assembly, the top cover assembly includes a top cover body and a top cover bracket, the specific structure of the top cover bracket refers to the above embodiment, since the top cover assembly adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. Among them, the battery includes a shell and a bare cell, the shell has an installation cavity and an installation opening connected to the installation cavity, the bare cell is arranged in the installation cavity, and the top cover assembly is sealed on the installation opening.

[0048] The above description is only an optional embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A top cover bracket, applied to a battery, characterized in that: The top cover bracket comprises: Two first end portions are arranged opposite to each other along the length direction of the top cover support; A limiting portion is connected between the two first end portions, wherein the inner surface of the limiting portion protrudes from the inner surface of the first end portion and can abut against the bare cell of the battery; and the inner surface of the first end portion is spaced apart from the bare cell.

2. The top cover bracket according to claim 1, characterized in that: A height difference between an inner surface of the limiting portion and an inner surface of the first end portion is 0.5 mm to 5 mm.

3. The top cover bracket according to claim 2, characterized in that: A height difference between an inner surface of the limiting portion and an inner surface of the first end portion is 1 mm to 2 mm.

4. A top cover assembly, characterized in that: It comprises a top cover body and a top cover bracket as described in any one of claims 1 to 3, wherein the top cover bracket is arranged on the top cover body.

5. The top cover assembly according to claim 4, characterized in that: The top cover body is provided with a liquid injection hole, the top cover bracket is provided with a buffer groove and a plurality of liquid holes connected with the buffer groove, and the notch of the buffer groove is connected with the liquid injection hole.

6. The top cover assembly according to claim 5, characterized in that: The buffer groove is arranged at the limiting portion of the top cover bracket, and on a section perpendicular to the thickness direction of the top cover bracket, the cross-sectional area of ​​the buffer groove is larger than the cross-sectional area of ​​the injection hole.

7. The top cover assembly according to claim 6, characterized in that: The liquid-passing hole is arranged on the bottom wall of the buffer groove and extends along the thickness direction of the top cover bracket. The bottom wall of the buffer groove abuts against the bare cell of the battery.

8. The top cover assembly according to claim 7, characterized in that: The aperture of the liquid passage hole is smaller than the aperture of the liquid injection hole; And / or, at least two of the liquid holes are spaced apart and distributed along the length direction of the top cover support; And / or, at least two of the liquid holes are spaced apart and distributed along the width direction of the top cover support.

9. The top cover assembly according to claim 5, characterized in that: The top cover assembly also includes a pole connected to a bare cell of the battery, the buffer slot is arranged at the first end of the top cover bracket, and a clearance hole is arranged at the second end of the top cover bracket corresponding to the pole, and one end of the pole passes through the clearance hole and is exposed to the outside.

10. A battery, characterized in that: It comprises a shell, a bare battery cell and a top cover assembly as described in any one of claims 4 to 9, wherein the shell has an installation cavity and an installation opening connected to the installation cavity, the bare battery cell is arranged in the installation cavity, and the top cover assembly is sealed on the installation opening.

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