CN216145749U

CN216145749U - Secondary battery liquid injection hole sealing structure, secondary battery cell and battery pack

Info

Publication number: CN216145749U
Application number: CN202120640244.1U
Authority: CN
Inventors: 张五堂; 何金磊
Original assignee: Shanghai Lanjun New Energy Technology Co Ltd
Current assignee: Shanghai Lanjun New Energy Technology Co Ltd
Priority date: 2021-03-29
Filing date: 2021-03-29
Publication date: 2022-03-29
Anticipated expiration: 2031-03-29

Abstract

The utility model relates to a sealing structure of a liquid injection hole of a secondary battery, which comprises the liquid injection hole on a battery top cover, a rubber sealing nail assembled in the liquid injection hole, and a sealing nail fixing piece covering the rubber sealing nail and sealing the top of the liquid injection hole. Compared with the prior art, the utility model has the advantages of low cost, good sealing effect, simple operation and the like.

Description

Secondary battery liquid injection hole sealing structure, secondary battery cell and battery pack

Technical Field

The utility model relates to a new energy battery, relates to a secondary battery, and particularly relates to a secondary battery liquid injection hole sealing structure, a secondary battery cell and a battery pack.

Background

In square reason battery, reserve on the casing and annotate the liquid hole, after square reason battery assembly is accomplished, need pour into electrolyte into square reason battery's casing through annotating the liquid hole in, guarantee that square reason battery's electric core is soaked by electrolyte. The sealing of the liquid injection hole after the injection of the electrolyte is completed is particularly important, and if the liquid injection hole is not sealed tightly, leakage of the lithium battery can be caused, so that the performance of the battery is reduced, and the electrolyte is easily contaminated on other parts to cause corrosion of the parts.

The liquid injection hole of the existing lithium battery is sealed by adopting a mode of a sealing rubber nail and an aluminum nail. The method has the following defects:

1. two parts are needed, and the process is complex;

2. the cost is high because the fixing is carried out by laser welding;

3. the welding can not be disassembled after welding, and electrolyte can not be supplemented.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects in the prior art and provide a secondary battery liquid injection hole sealing structure, a secondary battery cell and a battery pack, which have the advantages of low cost, good sealing effect and simple operation.

The purpose of the utility model can be realized by the following technical scheme:

in a first aspect, the utility model provides a sealing structure for a liquid injection hole of a secondary battery, which comprises the liquid injection hole on a battery top cover and a rubber sealing nail assembled in the liquid injection hole, and further comprises a sealing nail fixing part which covers the rubber sealing nail and seals the top of the liquid injection hole.

In an alternative embodiment, the seal nail fixture is a fixing glue.

In an alternative embodiment, the top of the rubber sealing nail is provided with a groove matched with the fixing glue.

In an optional embodiment, the sealing nail fixing part is a top patch, the top of the rubber sealing nail is flush with the orifice of the liquid injection hole, and the top patch sealing cover is arranged on the battery top cover.

In an alternative embodiment, the top patch comprises an insulating layer and an adhesive layer which are attached up and down, and the adhesive layer is connected with the top cover of the battery.

In an alternative embodiment, the rubber sealing nail is provided with an inverted buckle.

In an optional embodiment, the rubber sealing nail comprises a nail cap part and a nail body part, the inner side wall of the liquid injection hole is provided with a bulge which is abutted to the rubber sealing nail in an interference fit manner, one side of the bulge, which is contacted with the rubber sealing nail, comprises a first abutting part, a first inclined opening and a second abutting part which are sequentially connected, the first abutting part is abutted to the nail cap part, and the second abutting part is abutted to the nail body part in an interference fit manner.

In an alternative embodiment, the side of the protrusion contacting the rubber sealing nail further comprises a second bevel opening contacting the second abutting part.

In a second aspect, the utility model provides a secondary battery cell, which comprises a battery top cover, wherein the battery top cover is provided with the liquid injection hole sealing structure.

In a third aspect, the present invention provides a battery pack, including the secondary battery cell as described above.

Compared with the prior art, the sealing is realized through the interference fit of the rubber sealing nail and the liquid injection hole; and set up the sealed nail of fixed rubber of sealed nail mounting, have following beneficial effect:

1. the fixing problem of the rubber sealing nail is solved through the sealing nail fixing piece, the operation is simple and convenient, and the cost is low;

2. the rubber sealing nail is abutted with the bulge of the liquid injection hole in an interference fit manner, so that the sealing reliability is high and the sealing effect is good;

3. the bulge of the liquid injection hole is provided with the inclined opening, so that the rubber sealing rubber nail is convenient to assemble and disassemble;

4. the sealing nail fixing piece is different from the traditional welding seal, the sealing nail fixing piece adopts fixing glue or a top patch, the operation is convenient, the sealing nail fixing piece can be conveniently detached, the rubber sealing nail can be taken out, and the repeated liquid injection of the battery is realized under the condition that the top cover of the battery is not damaged.

Drawings

FIG. 1 is a schematic structural diagram of a top cover of a battery in an embodiment;

fig. 2 is a sectional view of a top cap of a battery in an embodiment, wherein a sealing structure is shown at B;

FIG. 3 is a top view of a battery top cover in an embodiment;

FIG. 4 is a cross-sectional view of a seal structure;

FIG. 5 is a cross-sectional view of an alternative sealing arrangement;

FIG. 6 is a top view of the rubber sealing nail in the embodiment;

FIG. 7 is a cross-sectional view taken at E-E of FIG. 6;

FIG. 8 is a cross-sectional view of an embodiment of a top cover sheet;

FIG. 9 is an enlarged view at G of FIG. 8;

in the figure, 1, a rubber sealing nail, 2, a top cover plate, 3, lower plastic, 4, fixing glue, 5, a top patch, 6, a liquid injection hole, 101, a nail cap part, 102, a nail body part, 103, an inverted buckle, 201, a first abutting part, 202, a first bevel opening, 203, a second abutting part, 204 and a second bevel opening.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element to which the description refers must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

Example 1

Referring to fig. 1-4, the present embodiment provides a sealing structure for a liquid injection hole of a secondary battery, which includes a liquid injection hole 6 on a top cover of the battery, wherein a protrusion is disposed on the inner side wall of the liquid injection hole 6, the sealing structure further includes a rubber sealing nail 1 and a sealing nail fixing member, the rubber sealing nail 1 is assembled in the liquid injection hole and is abutted to the protrusion in an interference fit manner, and the sealing nail fixing member covers the rubber sealing nail 1 to seal the top of the liquid injection hole 6.

As shown in figure 3, the battery top cover comprises a top cover plate 2 and lower plastic 3, and the liquid injection hole 6 is positioned on the top cover plate 2.

Referring to fig. 6-9, the rubber seal nail 1 includes a nail cap part 101 and a nail body part 102, one side of the protrusion contacting the rubber seal nail 1 includes a first abutting part 201, a first bevel opening 202 and a second abutting part 203 which are connected in sequence, the first abutting part 201 abuts against the nail cap part 101, the second abutting part 203 abuts against the nail body part 102 in an interference fit manner, and therefore sealing reliability is improved, and meanwhile assembly of the rubber seal nail 1 is facilitated.

In another embodiment, the side of the protrusion contacting the rubber seal nail 1 further comprises a second bevel opening 204 contacting the second abutting portion 203, so as to further improve the assembly simplicity of the rubber seal nail 1.

Referring to fig. 3 and 4, in the present embodiment, the sealing nail fixing member is a fixing glue 4, and the fixing glue 4 is disposed on the top of the rubber sealing nail 1 to fix the rubber sealing nail 1 in the liquid injection hole 6.

In an optional embodiment, the top of the rubber seal nail 1 is provided with a groove matched with the fixing glue 4, so that the fixing glue 4 is reliably connected with the rubber seal nail 1, and the effective fixation of the rubber seal nail 1 is realized.

In another embodiment, the rubber sealing nail 1 is provided with an inverted buckle 103 to improve the connection stability.

Example 2

Referring to fig. 5, in the sealing structure for the liquid filling hole of the secondary battery provided in this embodiment, the sealing nail fixing member is a top patch 5, the top of the rubber sealing nail 1 is flush with the orifice of the liquid filling hole 6, and a sealing cover of the top patch 5 is disposed on the top cover of the battery.

Preferably, the top patch 5 comprises an insulating layer and an adhesive layer which are attached up and down, and the adhesive layer is connected with the top cover of the battery.

The rest is the same as example 1.

Example 3

Referring to fig. 1 to 9, the present embodiment provides a secondary battery cell including a battery top cap having a pour hole sealing structure as in embodiment 1 or embodiment 2.

Example 4

Referring to fig. 1 to 9, the present embodiment provides a battery pack including the secondary battery cells according to embodiment 3.

The battery pack can be installed in a new energy automobile.

The foregoing detailed description of the preferred embodiments of the utility model has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.

Claims

1. The utility model provides a secondary battery annotates liquid hole seal structure, including annotate on the battery top cap liquid hole (6) with assemble in annotate the sealed nail of rubber (1) in liquid hole (6), its characterized in that, seal structure still includes sealed nail mounting, cover in on the sealed nail of rubber (1), seal annotate liquid hole (6) top, be provided with back-off (103) on the sealed nail of rubber (1).

2. The secondary battery injection hole sealing structure according to claim 1, wherein the seal nail fixing member is a fixing glue (4).

3. The secondary battery liquid injection hole sealing structure according to claim 2, characterized in that the top of the rubber sealing nail (1) is provided with a groove matched with the fixing glue (4).

4. The secondary battery liquid injection hole sealing structure according to claim 1, wherein the sealing nail fixing member is a top patch (5), the top of the rubber sealing nail (1) is flush with the hole opening of the liquid injection hole (6) or is 0-2mm higher than the hole opening, and the top patch (5) is arranged on the battery top cover in a sealing way.

5. The secondary battery liquid injection hole sealing structure according to claim 4, wherein the top patch (5) comprises an insulating layer and a glue layer which are attached up and down, and the glue layer is connected with the top cover of the battery.

6. The secondary battery liquid injection hole sealing structure according to claim 1, wherein the rubber sealing nail (1) comprises a nail cap part (101) and a nail body part (102), the inner side wall of the liquid injection hole is provided with a bulge which is in interference fit and butt joint with the rubber sealing nail (1), one side of the bulge, which is in contact with the rubber sealing nail (1), comprises a first butt part (201), a first inclined opening (202) and a second butt part (203) which are sequentially connected, the first butt part (201) is in butt joint with the nail cap part (101), and the second butt part (203) is in interference fit and butt joint with the nail body part (102).

7. The secondary battery injection hole sealing structure according to claim 6, wherein the side of the protrusion in contact with the rubber sealing nail (1) further comprises a second bevel opening (204) in contact with the second abutting portion (203).

8. A secondary battery cell comprising a battery top cover having the pour hole sealing structure according to any one of claims 1 to 7.

9. A battery pack comprising the secondary battery cell of claim 8.