Lithium battery sealing structure

Abstract

The utility model discloses a lithium battery sealing structure, which comprises an upper shell and a lower shell, an outer sealing groove and an inner sealing groove are arranged on the lower shell, a plurality of channels are arranged between the outer sealing groove and the inner sealing groove, a thin film is arranged on the outer sealing groove, and the inner sealing groove is arranged on the inner sealing groove. According to the utility model, through the downward pressing of the upper shell, the convex blocks crush the film to enable glue to flow into the inner sealing groove along the channel, and the glue in the inner sealing groove is bonded and fixed with the sealing blocks of the upper shell, so that the bonding degree of the upper shell and the lower shell can be improved; therefore, the sealing performance of the lithium battery body is improved.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery sealing technology, and in particular to a lithium battery sealing structure. Background Technology

[0002] Currently, lithium batteries are generally sealed inside a casing, which consists of two casings and is sealed by potting compound.

[0003] In existing technologies, the glue-filling method requires manual injection of glue from the gap between the two shells, resulting in poor glue-filling effect and poor sealing. For example, in the published document CN220420732U, the upper shell ring edge and the lower shell ring edge are bonded and sealed by an adhesive layer. The adhesive layer is injected with glue through a mesh. Since glue needs to be injected on the mesh in advance, some glue will cure, affecting the bonding strength between the upper shell and the lower shell, thus affecting the sealing performance.

[0004] This application is made by the applicant for a complete adhesive seal between the upper and lower housings. Utility Model Content

[0005] This utility model addresses the shortcomings of existing technologies by providing a lithium battery sealing structure. By pressing down on the upper shell to break the film, the adhesive flows into the inner sealing groove and bonds and seals with the upper shell.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] A lithium battery sealing structure includes an upper shell and a lower shell. The lower shell is provided with an outer sealing groove and an inner sealing groove. There are several channels between the outer sealing groove and the inner sealing groove. A thin film is provided on the outer sealing groove. The upper shell is provided with several protrusions for crushing the thin film.

[0008] In the above scheme, preferably, the outer sealing groove and the inner sealing groove have the same groove depth, and the outer sealing groove and the inner sealing groove are connected through the plurality of channels.

[0009] In the above scheme, preferably, the film is provided with an injection port for injecting glue.

[0010] In the above scheme, preferably, the adhesive is a polyurethane adhesive.

[0011] In the above scheme, preferably, the film is a flexible component, the shape of the film is adapted to the shape of the outer sealing groove, and the height of the film when filled with glue is lower than the groove depth of the outer sealing groove.

[0012] In the above scheme, preferably, the upper housing is provided with a sealing block that is compatible with the inner sealing groove.

[0013] In the above scheme, preferably, the protrusion height of the sealing block is less than the depth of the inner sealing groove.

[0014] The beneficial effects of this utility model are: by pressing down on the upper shell, the protrusion breaks the film, allowing the glue to flow into the inner sealing groove along the channel. The glue in the inner sealing groove is bonded and fixed to the sealing block of the upper shell, which can improve the bonding degree between the upper shell and the lower shell, thereby improving the sealing performance of the lithium battery body. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the present invention.

[0016] Figure 2 for Figure 1 Enlarged diagram of point A1 in the middle.

[0017] Figure 3 This is a schematic diagram of the upper and lower shell structures of this utility model. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments:

[0019] See Figures 1-3 A lithium battery sealing structure includes an upper housing 1 and a lower housing 2. The main reason for sealing the lithium battery with two housings is to protect the key components inside the battery and prevent the external environment from having an adverse effect on them.

[0020] An outer sealing groove 3 and an inner sealing groove 4 are provided on the lower housing 2. In order to enable the two to communicate, several channels 5 are provided between the outer sealing groove 3 and the inner sealing groove 4 to realize the communication between the outer sealing groove 3 and the inner sealing groove 4.

[0021] Specifically, a membrane 6 is installed on the outer sealing groove 3. The membrane 6 is a flexible component that can adapt to the shape of the outer sealing groove 3. The membrane 6 is installed inside the outer sealing groove 3. The membrane 6 is provided with an injection port 8. Adhesive can be injected into the membrane 6 manually or by using an adhesive injection machine. The adhesive is polyurethane adhesive, which can provide high bonding strength, good initial tack, and durability. When the membrane 6 is filled with adhesive, the height of the membrane 6 is lower than the depth of the outer sealing groove 3 and is located inside the outer sealing groove 3.

[0022] Furthermore, several protrusions 7 are provided on the upper housing 1. When the upper housing 1 and the lower housing 2 are engaged, the protrusions 7 can crush the film 6. When the film 6 filled with glue extends beyond the outer sealing groove 3, the protrusions 7 will crush the film 6, causing the glue to run around or overflow, which will damage the sealing of the lithium battery casing and cause electrolyte leakage. This will not only affect the performance of the battery, but also cause safety hazards. Therefore, the film 6 filled with glue is located inside the outer sealing groove 3. When the protrusions 7 of the upper housing 1 crush the film 6, the glue can flow into the inner sealing groove 4 through the channel 5.

[0023] To enable better adhesion between the upper housing 1 and the lower housing 2 using adhesive, a sealing block 9 is fixedly installed on the upper housing 1. The shape of the sealing block 9 is adapted to the shape of the inner sealing groove 4, and the protrusion height of the sealing block 9 is less than the depth of the inner sealing groove 4. When the adhesive in the film 6 flows into the inner sealing groove 4 through the channel 5, the sealing block 9 of the upper housing 1 can fully contact the adhesive in the inner sealing groove 4, thereby achieving full adhesion strength between the upper housing 1 and the lower housing 2 and improving the sealing performance of the lithium battery in the two housings.

[0024] Working principle: A thin film 6 is installed in the outer sealing groove 3. Adhesive is injected into the thin film 6 by manual injection or injection machine. The thin film 6 filled with adhesive is lower than the groove depth. The upper shell 1 covers the lower shell 2. When the upper shell 2 is pressed down, the protrusion 7 breaks the thin film 6. The adhesive in the thin film 6 flows into the inner sealing groove 4 through the channel 5. The sealing block 9 of the upper shell 1 can fully contact the adhesive in the inner sealing groove 4, thereby realizing the full bonding between the upper shell 1 and the lower shell 2.

[0025] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A lithium battery sealing structure, comprising an upper housing (1) and a lower housing (2), characterized in that: The lower housing (2) is provided with an outer sealing groove (3) and an inner sealing groove (4), and there are several channels (5) between the outer sealing groove (3) and the inner sealing groove (4). A thin film (6) is provided on the outer sealing groove (3), and several protrusions (7) are provided on the upper housing (1) for crushing the thin film (6).

2. The lithium battery sealing structure according to claim 1, characterized in that: The outer sealing groove (3) and the inner sealing groove (4) have the same depth, and the outer sealing groove (3) and the inner sealing groove (4) are connected through the plurality of channels (5).

3. The lithium battery sealing structure according to claim 1, characterized in that: The film (6) is provided with an injection port (8) for injecting glue.

4. The lithium battery sealing structure according to claim 3, characterized in that: The adhesive is a polyurethane adhesive.

5. A lithium battery sealing structure according to claim 1, characterized in that: The film (6) is a flexible part, and the shape of the film (6) is adapted to the shape of the outer sealing groove (3). When the film (6) is filled with glue, its height is lower than the groove depth of the outer sealing groove (3).

6. A lithium battery sealing structure according to claim 1, characterized in that: The upper housing (1) is provided with a sealing block (9) that is compatible with the inner sealing groove (4).

7. A lithium battery sealing structure according to claim 6, characterized in that: The protrusion height of the sealing block (9) is less than the depth of the inner sealing groove (4).

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