Lithium battery structure for improving opening effect of anti-explosion valve

Abstract

The utility model discloses a lithium battery structure for improving the opening effect of an anti-explosion valve. The lithium battery structure comprises a core bag and a shell positioned outside the core bag, one side of the upper end of the shell is a positive electrode assembly, and the other side of the upper end of the shell is a negative electrode assembly; the core package is connected with the positive pole through a positive conductive column of the positive component, and is connected with the negative pole through a negative conductive column of the negative component; a top cover is integrated at the bottom of the core bag, and an anti-explosion valve is integrated in the middle of the top cover. The central area of the top cover is an anti-explosion valve mounting area; the anti-explosion valve installation area of the top cover is in a grid shape through a plurality of reinforcing ribs. The anti-explosion valve is installed in the anti-explosion valve installation area and provided with an anti-explosion valve protection film. The anti-explosion valve mounting area of the top cover of the lithium battery structure provided by the utility model is provided with the reinforcing ribs, so that the position strength of the anti-explosion valve can be improved, and the anti-explosion valve is not influenced by the expansion force of the battery cell in the circulation process of the battery cell.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery technology, and in particular to a lithium battery structure that enhances the opening effect of the explosion-proof valve. Background Technology

[0002] As the power battery industry has developed, numerous problems have emerged, especially safety issues, which cannot be ignored. In the event of a battery safety incident, the explosion-proof valve plays a crucial role. The timely opening of the explosion-proof valve significantly reduces the damage caused by a battery safety incident.

[0003] Therefore, based on the above-mentioned technical problems, those skilled in the art urgently need to develop a lithium battery structure that can improve the opening effect of the explosion-proof valve. Utility Model Content

[0004] The purpose of this invention is to provide a lithium battery structure that enhances the opening effect of the explosion-proof valve. This structure ensures accurate opening of the explosion-proof valve, and the explosion-proof valve is integrated into the top cover located at the bottom, ensuring downward opening and improving safety.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] This utility model discloses a lithium battery structure for improving the opening effect of an explosion-proof valve. The lithium battery structure includes:

[0007] Core package;

[0008] The housing located outside the core package;

[0009] One side of the upper end of the housing is the positive electrode assembly, and the other side of the upper end of the housing is the negative electrode assembly;

[0010] The core package is connected to the positive terminal through the positive conductive post of the positive electrode assembly, and the core package is connected to the negative terminal through the negative conductive post of the negative electrode assembly.

[0011] The bottom of the core package is integrated with a top cover, and an explosion-proof valve is integrated in the middle of the top cover;

[0012] The central area of ​​the top cover is the installation area for the explosion-proof valve;

[0013] The explosion-proof valve installation area of ​​the top cover is formed into a grid shape by multiple reinforcing ribs;

[0014] The explosion-proof valve is installed in the explosion-proof valve installation area and is provided with an explosion-proof valve protective film.

[0015] Furthermore, an explosion-proof valve mounting platform that mates with the explosion-proof valve is formed on the periphery of the top cover;

[0016] An explosion-proof valve protective film mounting base is formed on the outer periphery of the explosion-proof valve mounting base, which cooperates with the explosion-proof valve protective film.

[0017] Furthermore, a positive electrode support is machined at the position where the housing mates with the positive electrode assembly, and a positive electrode through hole is opened at the center of the positive electrode support;

[0018] The positive electrode component includes:

[0019] Positive busbar;

[0020] The positive conductive post passes through the positive electrode through-hole and is connected to the core package; and

[0021] A positive electrode post has a through hole in its center, and a positive conductive post passes through the through hole and is connected to the positive electrode post.

[0022] Furthermore, the lower part of the positive electrode post passes through the positive electrode through hole and extends into the interior of the housing;

[0023] A positive electrode upper plastic is provided between the upper part of the positive electrode post and the housing, and a positive electrode lower plastic is provided between the lower part of the positive electrode post and the housing. A sealing ring is provided between the positive electrode upper plastic and the positive electrode post, and the sealing ring is pressed by the upper structure of the positive electrode post.

[0024] Furthermore, a negative electrode support is machined at the position where the housing mates with the negative electrode assembly, and a negative electrode through hole is opened at the center of the negative electrode support;

[0025] The negative electrode component includes:

[0026] Negative busbar;

[0027] The negative electrode conductive post passes through the negative electrode through-hole and is connected to the core package; and

[0028] The negative electrode has a through hole in its center, and the negative conductive post passes through the through hole and is connected to the negative electrode.

[0029] Furthermore, the lower part of the negative electrode post passes through the negative electrode through hole and extends into the interior of the housing;

[0030] A negative electrode upper plastic is provided between the upper part of the negative electrode post and the housing, and a negative electrode lower plastic is provided between the lower part of the negative electrode post and the housing. A sealing ring is provided between the negative electrode upper plastic and the negative electrode post, and the sealing ring is pressed by the upper structure of the negative electrode post.

[0031] Furthermore, the upper middle region of the negative electrode post is a copper electrode post, while the remaining regions of the negative electrode post are aluminum electrode posts.

[0032] Furthermore, the core package is covered with an inner insulating film, and the core package covered with the inner insulating film is embedded in the housing.

[0033] Furthermore, the explosion-proof valve has a downwardly recessed explosion-proof valve reinforcing rib.

[0034] Furthermore, the explosion-proof valve has grooves near the two curved edges.

[0035] In the above technical solution, the lithium battery structure provided by this utility model to enhance the opening effect of the explosion-proof valve has the following beneficial effects:

[0036] The explosion-proof valve mounting area of ​​the top cover of the lithium battery structure provided by this utility model is provided with reinforcing ribs, which can increase the positional strength of the explosion-proof valve. During the battery cell cycle, the explosion-proof valve will not be affected by the expansion force of the battery cell.

[0037] The explosion-proof valve of the lithium battery structure provided by this utility model is laser-welded onto the top cover, and the weld mark is located at the bottom of the battery. The effect of the weld mark can be inspected with visual equipment to prevent defective products from flowing out.

[0038] The top cover and explosion-proof valve of the lithium battery structure provided by this utility model are located at the bottom of the battery and can be opened downwards to increase battery safety.

[0039] The explosion-proof valve of the lithium battery structure provided by this utility model has an explosion-proof valve reinforcing rib. During the battery cell cycle, the explosion-proof valve will not be affected by changes in air pressure, and the opening value will not change. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0041] Figure 1 This is a schematic diagram of a lithium battery structure for improving the opening effect of an explosion-proof valve, as disclosed in an embodiment of this application. Figure 1 ;

[0042] Figure 2 This is a schematic diagram of a lithium battery structure for improving the opening effect of an explosion-proof valve, as disclosed in an embodiment of this application. Figure 2 ;

[0043] Figure 3 This is a front view of a lithium battery structure that enhances the opening effect of an explosion-proof valve, as disclosed in an embodiment of this application.

[0044] Figure 4 for Figure 3 Sectional view along line AA;

[0045] Figure 5 for Figure 4 A magnified view of a portion of the image;

[0046] Figure 6 for Figure 3 Sectional view along the BB direction;

[0047] Figure 7 for Figure 6 A magnified view of a portion of the image;

[0048] Figure 8 for Figure 3 C-axis sectional view;

[0049] Figure 9 for Figure 8 A magnified view of a portion of the image;

[0050] Figure 10 This is a schematic diagram of the positive and negative electrode components of a lithium battery structure that enhances the opening effect of an explosion-proof valve, as disclosed in an embodiment of this application.

[0051] Figure 11 This is a schematic diagram of the front of the top cover of a lithium battery structure that enhances the opening effect of an explosion-proof valve, as disclosed in an embodiment of this application.

[0052] Figure 12 This is a schematic diagram of the top and bottom surfaces of a lithium battery structure that enhances the opening effect of an explosion-proof valve, as disclosed in an embodiment of this application.

[0053] Figure 13 This is a schematic diagram of the structure of an explosion-proof valve, which is a lithium battery structure that enhances the opening effect of the explosion-proof valve, as disclosed in an embodiment of this application.

[0054] Explanation of reference numerals in the attached figures:

[0055] 1. Housing; 2. Positive electrode assembly; 3. Negative electrode assembly; 4. Top cover; 5. Explosion-proof valve;

[0056] 101. Core package; 102. Inner insulating film;

[0057] 201. Positive electrode post; 202. Positive conductive post; 203. Upper positive electrode plastic; 204. Lower positive electrode plastic; 205. Positive electrode sealing ring; 206. Positive electrode busbar;

[0058] 301. Negative electrode post; 302. Negative conductive post; 303. Upper negative electrode plastic; 304. Lower negative electrode plastic; 305. Negative electrode sealing ring; 306. Negative electrode busbar;

[0059] 30101, Copper electrode post; 30102, Aluminum electrode post;

[0060] 401. Reinforcing rib; 402. Top cover through hole; 403. Explosion-proof valve mounting base; 404. Explosion-proof valve protective membrane mounting base;

[0061] 501. Explosion-proof valve protective film; 502. Explosion-proof valve reinforcing rib; 503. Score. Detailed Implementation

[0062] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0063] See Figures 1 to 13 As shown;

[0064] This embodiment discloses a lithium battery structure that enhances the opening effect of an explosion-proof valve. The lithium battery structure includes:

[0065] Core Packaging 101;

[0066] The housing 1 located outside the core package 101;

[0067] The positive electrode assembly 2 is located on one side of the upper end of the housing 1, and the negative electrode assembly 3 is located on the other side of the upper end of the housing 1.

[0068] The core package 101 is connected to the positive electrode post 201 through the positive electrode conductive post 202 of the positive electrode assembly 2, and the core package 101 is connected to the negative electrode post 301 through the negative electrode conductive post 302 of the negative electrode assembly 3.

[0069] The bottom of the core package 101 is integrated with a top cover 4, and the top cover 4 is integrated with an explosion-proof valve 5 in the middle.

[0070] The central area of ​​top cover 4 is the installation area for the explosion-proof valve;

[0071] The explosion-proof valve installation area of ​​the top cover 4 is formed into a grid shape by multiple reinforcing ribs 401;

[0072] The explosion-proof valve 5 is installed in the explosion-proof valve installation area and is equipped with an explosion-proof valve protective film 501.

[0073] Secondly, preferably, in this embodiment, an explosion-proof valve mounting base 403 that cooperates with the explosion-proof valve 5 is formed on the periphery of the top cover 4;

[0074] An explosion-proof valve protective film mounting base 404 is formed on the outer periphery of the explosion-proof valve mounting base 403, which cooperates with the explosion-proof valve protective film 501.

[0075] Specifically, this embodiment discloses a lithium battery structure that enhances the opening effect of the explosion-proof valve, which includes a core pack 101, a shell 1, a positive electrode assembly 2 and a negative electrode assembly 3, and a top cover 4 integrated at the bottom of the battery cell, and an explosion-proof valve 5 integrated on the top cover 4.

[0076] Based on the above structure, in this embodiment, the positive electrode post 201 of the positive electrode assembly 2 and the negative electrode post 301 of the negative electrode assembly 3 are both integrated on the housing 1, and the core package 101 is connected to the positive and negative electrode posts through the positive and negative conductive posts, which greatly improves the overall space utilization of the battery cell.

[0077] Preferably, in this embodiment, a positive electrode support is machined at the position where the housing 1 mates with the positive electrode assembly 2, and a positive electrode through hole is opened at the center of the positive electrode support;

[0078] In this embodiment, the positive electrode assembly 2 includes a positive electrode busbar 206; a positive electrode conductive post 202 that passes through a positive electrode through hole and is connected to the core package 101; and a positive electrode post 201. During processing, a through hole is opened in the center of the positive electrode post 201 in this embodiment, and the positive electrode conductive post 202 passes through the through hole of the positive electrode post 201 and is connected to the positive electrode post 201.

[0079] To further integrate and install the positive electrode assembly 2 with the housing 1, the lower part of the positive electrode post 201 in this embodiment passes through the positive electrode through hole and extends into the housing 1. The positive electrode post 201 is divided into an upper positive electrode structure and a lower positive electrode structure, wherein the cross-sectional dimension of the upper positive electrode structure is larger than that of the lower positive electrode structure. The lower positive electrode structure can pass through the positive electrode through hole and extend into the housing 1. Furthermore, in this embodiment, an upper positive electrode plastic 203 is provided between the upper part of the positive electrode post 201 and the housing 1, and a lower positive electrode plastic 204 is provided between the lower part of the positive electrode post 201 and the housing 1. A sealing ring is provided between the upper positive electrode plastic 203 and the positive electrode post 201, and the sealing ring is pressed by the upper structure of the positive electrode post 201.

[0080] During installation, a lower positive electrode plastic 204 is provided on the inner side of the housing 1, and an upper positive electrode plastic 203 is provided on the outer side of the housing 1. During installation, the lower part of the positive electrode post 201 is embedded into the housing 1, and the lower positive electrode plastic 204 is pressed by the lower structure of the positive electrode post 201. The upper structure of the positive electrode post 201 presses the sealing ring and then presses the upper positive electrode plastic 203, thus completing the assembly of the positive electrode assembly 2.

[0081] Secondly, similar to the structure and assembly process of the positive electrode component 2 mentioned above, this embodiment further defines the assembly process and structure of the negative electrode component 3, specifically: the housing 1 of this embodiment is machined with a negative electrode support at the position where it mates with the negative electrode component 3, and a negative electrode through hole is opened at the center of the negative electrode support.

[0082] In this embodiment, the negative electrode assembly 3 includes a negative electrode busbar 306; a negative electrode conductive post 302 that passes through a negative electrode through hole and is connected to the core package 101; and a negative electrode post 301, with a through hole in the center of the negative electrode post 301, and the negative electrode conductive post 302 passing through the through hole of the negative electrode post 301 and connected to the negative electrode post 301.

[0083] Secondly, in this embodiment, the lower part of the negative electrode post 301 passes through the negative electrode through hole and extends into the housing 1; an upper negative electrode plastic 303 is provided between the upper part of the negative electrode post 301 and the housing 1, a lower negative electrode plastic 304 is provided between the lower part of the negative electrode post 301 and the housing 1, and a sealing ring is provided between the upper negative electrode plastic 303 and the negative electrode post 301, and the sealing ring is pressed by the upper structure of the negative electrode post 301.

[0084] Since the structure and assembly process of the negative electrode component 3 are similar to those of the positive electrode component 2, they will not be described in detail here.

[0085] As a difference from the positive electrode component 2, in order to reduce costs and optimize the manufacturing process, the upper middle area of ​​the negative electrode post 301 is a copper electrode post 30101, and the rest of the negative electrode post 301 is an aluminum electrode post 30102.

[0086] Preferably, in this embodiment, the core package 101 is covered with an inner insulating film 102, and the core package 101 covered with the inner insulating film 102 is embedded in the housing 1.

[0087] The assembly process of the battery cell in this embodiment is as follows: First, the core package 101 is connected to the negative busbar 306 and the positive busbar 206. Then, the connected negative busbar 306 and positive busbar 206 are connected to the negative conductive post 302 and the positive conductive post 202, respectively. Then, the inner insulating film 102 is wrapped around the entire core package. Finally, the film-wrapped core package 101 is embedded into the housing 1. Then, the positive conductive post 202 is connected to the positive terminal post 201, and the negative conductive post 302 is connected to the negative terminal post 301. Finally, the bottom top cover 4 is installed.

[0088] Preferably, in this embodiment, the explosion-proof valve installation area of ​​the top cover 4 is formed into a grid shape by multiple reinforcing ribs 401;

[0089] The explosion-proof valve 5 is installed in the explosion-proof valve installation area and is equipped with an explosion-proof valve protective film 501.

[0090] In this embodiment, the explosion-proof valve 5 has an explosion-proof valve reinforcing rib 502 formed by a downward indentation.

[0091] In this embodiment, the explosion-proof valve 5 has grooves 502 near the arc-shaped edges on both sides.

[0092] In this embodiment, the explosion-proof valve 5 is integrated on the top cover 4 located at the bottom of the battery cell, allowing the explosion-proof valve 5 to open downwards, increasing safety. At the same time, the installation position of the explosion-proof valve 5 in this embodiment has a reinforcing rib 401, which increases the overall strength of the top cover 4 and allows the explosion-proof valve 5 to open accurately. In addition, the explosion-proof valve 5 in this embodiment has a reinforcing rib, which increases the overall strength of the explosion-proof valve 5, and an elliptical groove 503 is provided near the arc edge, which allows the explosion-proof valve 5 to open accurately.

[0093] In this embodiment, the busbar is divided into two parts, namely the positive busbar 206 and the negative busbar 306, which can enhance the current carrying capacity of the busbar.

[0094] In the above technical solution, the lithium battery structure provided by this utility model to enhance the opening effect of the explosion-proof valve has the following beneficial effects:

[0095] The explosion-proof valve installation area of ​​the top cover 4 of the lithium battery structure provided by this utility model is provided with reinforcing ribs 401, which can increase the position strength of the explosion-proof valve 5. During the battery cell cycle, the explosion-proof valve 5 will not be affected by the battery cell expansion force.

[0096] The explosion-proof valve 5 of the lithium battery structure provided by this utility model is laser-welded onto the top cover 4, and the weld mark is located at the bottom of the battery. The effect of the weld mark can be inspected with visual equipment to prevent defective welded products from flowing out.

[0097] The top cover 4 and explosion-proof valve 5 of the lithium battery structure provided by this utility model are located at the bottom of the battery and can be opened downwards to increase battery safety.

[0098] The explosion-proof valve 5 of the lithium battery structure provided by this utility model has an explosion-proof valve reinforcing rib 502. During the battery cell cycle, the explosion-proof valve 5 will not be affected by changes in air pressure, and the opening value will not change.

[0099] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A lithium battery structure for improving the opening effect of an explosion-proof valve, characterized in that, The lithium battery structure includes: Core package (101); The housing (1) located outside the core package (101); One side of the upper end of the housing (1) is the positive electrode assembly (2), and the other side of the upper end of the housing (1) is the negative electrode assembly (3); The core package (101) is connected to the positive terminal (201) through the positive conductive post (202) of the positive electrode assembly (2), and the core package (101) is connected to the negative terminal (301) through the negative conductive post (302) of the negative electrode assembly (3). The bottom of the core package (101) is integrated with a top cover (4), and an explosion-proof valve (5) is integrated in the middle of the top cover (4); The central area of ​​the top cover (4) is the installation area for the explosion-proof valve; The explosion-proof valve installation area of ​​the top cover (4) is formed into a grid shape by multiple reinforcing ribs (401); The explosion-proof valve (5) is installed in the explosion-proof valve installation area and is provided with an explosion-proof valve protective film (501).

2. The lithium battery structure for improving the opening effect of the explosion-proof valve according to claim 1, characterized in that, The top cover (4) has an explosion-proof valve mounting base (403) formed on its periphery to cooperate with the explosion-proof valve (5); An explosion-proof valve protective film mounting base (404) is formed on the outer periphery of the explosion-proof valve mounting base (403) to cooperate with the explosion-proof valve protective film (501).

3. The lithium battery structure for improving the opening effect of the explosion-proof valve according to claim 1, characterized in that, A positive electrode support is machined at the position where the housing (1) mates with the positive electrode assembly (2), and a positive electrode through hole is opened at the center of the positive electrode support; The positive electrode assembly (2) includes: Positive electrode busbar (206); A positive conductive post (202) passing through the positive electrode through-hole and connected to the core package (101); and A positive electrode post (201) has a through hole in its center, and a positive conductive post (202) passes through the through hole of the positive electrode post (201) and is connected to the positive electrode post (201).

4. The lithium battery structure for increasing the opening effect of the explosion-proof valve according to claim 3, characterized in that, The lower part of the positive electrode post (201) passes through the positive electrode through hole and extends into the interior of the housing (1); A positive electrode upper plastic (203) is provided between the upper part of the positive electrode post (201) and the housing (1), and a positive electrode lower plastic (204) is provided between the lower part of the positive electrode post (201) and the housing (1). A sealing ring is provided between the positive electrode upper plastic (203) and the positive electrode post (201), and the sealing ring is pressed by the upper structure of the positive electrode post (201).

5. A lithium battery structure for improving the opening effect of an explosion-proof valve according to claim 1, characterized in that, The housing (1) is machined with a negative electrode support at the position where it mates with the negative electrode assembly (3), and a negative electrode through hole is opened at the center of the negative electrode support. The negative electrode assembly (3) includes: Negative busbar (306); A negative electrode conductive post (302) passing through the negative electrode through-hole and connected to the core package (101); and The negative electrode post (301) has a through hole in its center, and the negative electrode conductive post (302) passes through the through hole of the negative electrode post (301) and is connected to the negative electrode post (301).

6. A lithium battery structure for improving the opening effect of an explosion-proof valve according to claim 5, characterized in that, The lower part of the negative electrode post (301) passes through the negative electrode through hole and extends into the interior of the housing (1); A negative electrode upper plastic (303) is provided between the upper part of the negative electrode post (301) and the housing (1), and a negative electrode lower plastic (304) is provided between the lower part of the negative electrode post (301) and the housing (1). A sealing ring is provided between the negative electrode upper plastic (303) and the negative electrode post (301), and the sealing ring is pressed by the upper structure of the negative electrode post (301).

7. A lithium battery structure for improving the opening effect of an explosion-proof valve according to claim 5 or 6, characterized in that, The upper middle region of the negative electrode post (301) is a copper electrode post (30101), and the remaining regions of the negative electrode post (301) are aluminum electrode posts (30102).

8. A lithium battery structure for improving the opening effect of an explosion-proof valve according to claim 1, characterized in that, The core package (101) is covered with an inner insulating film (102), and the core package (101) covered with the inner insulating film (102) is embedded in the housing (1).

9. A lithium battery structure for improving the opening effect of an explosion-proof valve according to claim 1, characterized in that, The explosion-proof valve (5) has an explosion-proof valve reinforcing rib (502) formed by a downward indentation.

10. A lithium battery structure for improving the opening effect of an explosion-proof valve according to claim 9, characterized in that, The explosion-proof valve (5) has grooves (503) near the arc-shaped edges on both sides.

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