Lithium battery structure

Abstract

The invention discloses a lithium battery structure which comprises a core package and a shell positioned outside the core package, 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 positive and negative poles of the lithium battery structure are integrated in the shell, the core package is connected with the positive and negative poles through the positive and negative conductive poles, and the top cover is positioned at the bottom of the battery cell, so that the overall space utilization rate of the battery cell can be greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium ion batteries, and in particular to a lithium battery structure. Background Art

[0002] As the power battery industry gradually develops, the requirements for the energy density, space utilization and cost of power batteries have become more stringent. However, the power batteries in the prior art still use the traditional installation method, so the space utilization is very low and the manufacturing process is complicated.

[0003] Therefore, based on the above technical problems, technicians in this field urgently need to develop a lithium battery structure and an assembly method thereof. Summary of the invention

[0004] The purpose of the present invention is to provide a lithium battery structure, which has the advantages of high space utilization, simple manufacturing process and lower cost by re-conceptualizing the battery cell structure and optimizing the manufacturing process.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A lithium battery structure of the present invention comprises:

[0007] Core package;

[0008] a shell located outside the core package;

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

[0010] The core pack is connected to the positive electrode post through the positive electrode conductive column of the positive electrode assembly, and the core pack is connected to the negative electrode post through the negative electrode conductive column of the negative electrode assembly;

[0011] A top cover is integrated at the bottom of the core package, and an explosion-proof valve is integrated at the middle of the top cover.

[0012] Furthermore, a positive electrode support is processed at the position where the shell and the positive electrode assembly cooperate, and a positive electrode through hole is opened at the center of the positive electrode support;

[0013] The positive electrode assembly comprises:

[0014] Positive busbar;

[0015] A positive electrode conductive column passing through the positive electrode through hole and connected to the core package; and

[0016] A positive electrode column, a through hole is provided at the center of the positive electrode column, and the positive conductive column passes through the through hole of the positive electrode column and is connected to the positive electrode column.

[0017] Furthermore, the lower portion of the positive electrode column passes through the positive electrode through hole and extends into the interior of the shell;

[0018] A positive electrode upper plastic is arranged between the upper part of the positive electrode column and the shell, a positive electrode lower plastic is arranged between the lower part of the positive electrode column and the shell, and a sealing ring is arranged between the positive electrode upper plastic and the positive electrode column, and the sealing ring is pressed by the upper structure of the positive electrode column.

[0019] Furthermore, a negative electrode support is processed at the position where the shell and the negative electrode assembly cooperate, and a negative electrode through hole is opened at the center of the negative electrode support;

[0020] The negative electrode assembly comprises:

[0021] Negative busbar;

[0022] A negative electrode conductive column passing through the negative electrode through hole and connected to the core package; and

[0023] A negative electrode pole, wherein a through hole is provided at the center of the negative electrode pole, and the negative electrode conductive column passes through the through hole of the negative electrode pole and is connected to the negative electrode pole.

[0024] Furthermore, the lower portion of the negative electrode column passes through the negative electrode through hole and extends into the interior of the shell;

[0025] A negative electrode upper plastic is arranged between the upper part of the negative electrode column and the shell, a negative electrode lower plastic is arranged between the lower part of the negative electrode column and the shell, and a sealing ring is arranged between the negative electrode upper plastic and the negative electrode column, and the sealing ring is pressed by the upper structure of the negative electrode column.

[0026] Furthermore, the middle area of ​​the upper part of the negative electrode pole is a copper pole, and the rest of the negative electrode pole is an aluminum pole.

[0027] Furthermore, the core package is coated with an inner insulating film on the outside, and the core package coated with the inner insulating film is embedded in the shell.

[0028] Furthermore, the central area of ​​the top cover is an explosion-proof valve installation area;

[0029] The explosion-proof valve installation area of ​​the top cover is formed into a grid shape by a plurality of reinforcing ribs;

[0030] The explosion-proof valve is installed in the explosion-proof valve installation area and is provided with an explosion-proof valve protection film.

[0031] Furthermore, the explosion-proof valve has an explosion-proof valve reinforcement rib formed by being recessed downward.

[0032] Furthermore, the explosion-proof valve has notches near the arc-shaped edges on both sides.

[0033] In the above technical solution, the present invention provides a lithium battery structure, which has the following beneficial effects:

[0034] The positive and negative poles of the lithium battery structure provided by the present invention are integrated into the shell, the core pack is connected to the positive and negative poles through the positive and negative conductive columns, and the top cover is located at the bottom of the battery cell, which can greatly improve the overall space utilization of the battery cell.

[0035] The core pack of the lithium battery structure provided by the present invention is connected to the positive and negative busbars, the busbars are connected to the conductive posts, and the conductive posts are connected to the positive and negative pole posts. The overall manufacturing process is simple and fast.

[0036] The explosion-proof valve of the lithium battery structure provided by the present invention is integrated on the top cover at the bottom of the battery cell, so that the explosion-proof valve can be opened downward, thereby increasing safety.

[0037] The negative pole column of the lithium battery structure provided by the present invention adopts a copper-aluminum composite structure, which reduces costs and optimizes the manufacturing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0039] Figure 1 A schematic diagram of a lithium battery structure disclosed in an embodiment of the present application Figure 1 ;

[0040] Figure 2 A schematic diagram of a lithium battery structure disclosed in an embodiment of the present application Figure 2 ;

[0041] Figure 3 A front view of a lithium battery structure disclosed in an embodiment of the present application;

[0042] Figure 4 for Figure 3 Middle AA section view;

[0043] Figure 5 for Figure 4 A partial enlarged view of

[0044] Figure 6 for Figure 3 Middle BB section view;

[0045] Figure 7 for Figure 6 A partial enlarged view of

[0046] Figure 8 for Figure 3 Middle CC section view;

[0047] Fig. 9 for Figure 8 A partial enlarged view of

[0048] Fig.10 A schematic diagram of the structure of a positive electrode assembly and a negative electrode assembly of a lithium battery structure disclosed in an embodiment of the present application;

[0049] Fig.11 A schematic diagram of the structure of a top cover of a lithium battery structure disclosed in an embodiment of the present application;

[0050] Fig.12 This is a schematic structural diagram of an explosion-proof valve of a lithium battery structure disclosed in an embodiment of the present application.

[0051] Description of reference numerals:

[0052] 1. Shell; 2. Positive electrode assembly; 3. Negative electrode assembly; 4. Top cover; 5. Explosion-proof valve;

[0053] 101, core package; 102, inner insulating film;

[0054] 201, positive electrode column; 202, positive electrode conductive column; 203, positive electrode upper plastic; 204, positive electrode lower plastic; 205, positive electrode sealing ring; 206, positive electrode busbar;

[0055] 301, negative pole; 302, negative conductive pole; 303, negative upper plastic; 304, negative lower plastic; 305, negative sealing ring; 306, negative busbar;

[0056] 30101, copper pole; 30102, aluminum pole;

[0057] 401, reinforcement;

[0058] 501. explosion-proof valve protective film; 502. explosion-proof valve reinforcement rib; 503. notch. DETAILED DESCRIPTION

[0059] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0060] See also Figures 1 to 12 As shown;

[0061] This embodiment discloses a lithium battery structure, which includes:

[0062] Core package 101;

[0063] A shell 1 located outside the core package 101;

[0064] One side of the upper end of the shell 1 is the positive electrode assembly 2, and the other side of the upper end of the shell 1 is the negative electrode assembly 3;

[0065] The core pack 101 is connected to the positive electrode column 201 through the positive electrode conductive column 202 of the positive electrode assembly 2, and the core pack 101 is connected to the negative electrode column 301 through the negative electrode conductive column 302 of the negative electrode assembly 3;

[0066] A top cover 4 is integrated at the bottom of the core package 101 , and an explosion-proof valve 5 is integrated at the middle of the top cover 4 .

[0067] Specifically, this embodiment discloses a lithium battery structure, 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.

[0068] Based on the above structure, the positive electrode column 201 of the positive electrode assembly 2 and the negative electrode column 301 of the negative electrode assembly 3 of this embodiment are integrated on the shell 1, and the core package 101 is connected to the positive and negative electrode columns through the positive and negative conductive columns, which greatly improves the overall space utilization of the battery cell.

[0069] Preferably, a positive electrode support is processed at the position where the housing 1 of this embodiment cooperates with the positive electrode assembly 2, and a positive electrode through hole is opened at the center of the positive electrode support;

[0070] Among them, the positive electrode assembly 2 of this embodiment includes a positive busbar 206; a positive conductive column 202 passing through the positive through hole and connected to the core package 101; and a positive electrode column 201. During processing, a through hole is opened in the center of the positive electrode column 201 of this embodiment, and the positive conductive column 202 passes through the through hole of the positive electrode column 201 and is connected to the positive electrode column 201.

[0071] In order to further realize the integration and installation of the positive electrode assembly 2 and the shell 1, the lower part of the positive electrode column 201 of the present embodiment passes through the positive electrode through-hole and extends to the inside of the shell 1; the positive electrode column 201 is divided into a positive electrode upper structure and a positive electrode lower structure, wherein the cross-sectional size of the positive electrode upper structure is larger than the cross-sectional size of the positive electrode lower structure; and the positive electrode lower structure can pass through the positive electrode through-hole and extend to the inside of the shell 1; secondly, a positive electrode upper plastic 203 is arranged between the upper part of the positive electrode column 201 of the present embodiment and the shell 1, a positive electrode lower plastic 204 is arranged between the lower part of the positive electrode column 201 and the shell 1, and a sealing ring is arranged between the positive electrode upper plastic 203 and the positive electrode column 201, and the sealing ring is pressed by the upper structure of the positive electrode column 201.

[0072] During installation, the positive electrode lower plastic 204 is set on the inner side of the shell 1, and the positive electrode upper plastic 203 is set on the outer side of the shell 1; during installation, the lower part of the positive electrode column 201 is embedded in the shell 1, and the positive electrode lower plastic 204 is pressed by the lower structure of the positive electrode column 201, and the upper structure of the positive electrode column 201 presses the sealing ring and then presses the positive electrode upper plastic 203, so that the assembly of the positive electrode assembly 2 is completed.

[0073] Secondly, similar to the structure and assembly process of the above-mentioned positive electrode assembly 2, this embodiment further defines the assembly process and structure of the negative electrode assembly 3, specifically: the housing 1 of this embodiment is processed with a negative electrode support at the position where it cooperates with the negative electrode assembly 3, and a negative electrode through hole is opened at the center of the negative electrode support;

[0074] Among them, the negative electrode assembly 3 of this embodiment includes a negative electrode busbar 306; a negative electrode conductive column 302 passing through the negative electrode through hole and connected to the core package 101; and a negative electrode column 301, a through hole is opened in the center of the negative electrode column 301, and the negative electrode conductive column 302 passes through the through hole of the negative electrode column 301 and is connected to the negative electrode column 301.

[0075] Secondly, the lower part of the negative electrode column 301 of the present embodiment passes through the negative electrode through hole and extends to the inside of the shell 1; a negative electrode upper plastic 303 is arranged between the upper part of the negative electrode column 301 and the shell 1, a negative electrode lower plastic 304 is arranged between the lower part of the negative electrode column 301 and the shell 1, and a sealing ring is arranged between the negative electrode upper plastic 303 and the negative electrode column 301, and the sealing ring is pressed by the upper structure of the negative electrode column 301.

[0076] Since the structure and assembly process of the negative electrode assembly 3 are similar to those of the positive electrode assembly 2 , they will not be described in detail here.

[0077] As a difference from the positive electrode assembly 2 , in order to reduce costs and optimize the manufacturing process, the middle area of ​​the upper part of the negative electrode column 301 is a copper electrode column 30101 , and the rest of the negative electrode column 301 is an aluminum electrode column 30102 .

[0078] Preferably, the core package 101 of this embodiment is coated with an inner insulating film 102 on the outside, and the core package 101 coated with the inner insulating film 102 is embedded in the shell 1 .

[0079] The assembly process of the battery cell of this embodiment is as follows: first, the core package 101 is connected to the negative bus bar 306 and the positive bus bar 206, and the connected negative bus bar 306 and positive bus bar 206 are respectively connected to the negative conductive column 302 and the positive conductive column 202, and then the whole is wrapped with the inner insulating film 102, and finally the wrapped core package 101 is embedded in the shell 1, and then the positive conductive column 202 and the positive pole column 201 are connected, and the negative conductive column 302 is connected to the negative pole column 301, and finally the bottom cover 4 is installed.

[0080] As a preferred implementation, in this embodiment, the top cover 4 is integrated at the bottom of the battery cell, and an explosion-proof valve 5 is integrated thereon, so that the explosion-proof valve 5 can open downward, and the central area of ​​the top cover 4 is the explosion-proof valve installation area;

[0081] The explosion-proof valve installation area of ​​the top cover 4 is formed into a grid shape by a plurality of reinforcing ribs 401;

[0082] The explosion-proof valve 5 is installed in the explosion-proof valve installation area and is provided with an explosion-proof valve protection film 501 .

[0083] The explosion-proof valve 5 of this embodiment has an explosion-proof valve reinforcing rib 502 which is recessed downward.

[0084] The explosion-proof valve 5 of this embodiment has notches 502 near the arc edges on both sides.

[0085] The explosion-proof valve 5 of this embodiment is integrated on the top cover 4 located at the bottom of the battery cell, so that the explosion-proof valve 5 can open downward to increase safety. At the same time, the explosion-proof valve 5 of this embodiment has reinforcing ribs 401 at the installation position to increase the overall strength of the top cover 4 and allow the explosion-proof valve 5 to be opened accurately. At the same time, the explosion-proof valve 5 of this embodiment has reinforcing ribs to increase the overall strength of the explosion-proof valve 5, and an elliptical notch 503 is provided near the arc edge so that the explosion-proof valve 5 can be opened accurately.

[0086] The busbar of this embodiment is divided into two pieces, namely, the positive busbar 206 and the negative busbar 306, which can enhance the current carrying capacity of the busbar.

[0087] In the above technical solution, the present invention provides a lithium battery structure, which has the following beneficial effects:

[0088] The positive and negative poles of the lithium battery structure provided by the present invention are integrated in the shell 1, the core pack 101 is connected to the positive and negative poles through the positive and negative conductive columns, and the top cover 4 is located at the bottom of the battery cell, which can greatly improve the overall space utilization of the battery cell.

[0089] The core pack 101 of the lithium battery structure provided by the present invention is connected to the positive and negative busbars, the busbars are connected to the conductive posts, and the conductive posts are connected to the positive and negative poles. The overall manufacturing process is simple and fast.

[0090] The explosion-proof valve 5 of the lithium battery structure provided by the present invention is integrated on the top cover 4 at the bottom of the battery cell, so that the explosion-proof valve 5 can be opened downward, thereby increasing safety.

[0091] The negative pole column of the lithium battery structure provided by the present invention adopts a copper-aluminum composite structure, which reduces costs and optimizes the manufacturing process.

[0092] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that 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, characterized in that: The lithium battery structure includes: Core package (101); A shell (1) located outside the core package (101); One side of the upper end of the shell (1) is a positive electrode assembly (2), and the other side of the upper end of the shell (1) is a negative electrode assembly (3); The core package (101) is connected to the positive electrode column (201) via the positive electrode conductive column (202) of the positive electrode assembly (2), and the core package (101) is connected to the negative electrode column (301) via the negative electrode conductive column (302) of the negative electrode assembly (3); The bottom of the core package (101) is integrated with a top cover (4), and the middle of the top cover (4) is integrated with an explosion-proof valve (5).

2. A lithium battery structure according to claim 1, characterized in that: A positive electrode support is machined at a position where the shell (1) and the positive electrode assembly (2) cooperate, and a positive electrode through hole is opened at the center of the positive electrode support; The positive electrode assembly (2) comprises: A positive busbar (206); a positive electrode conductive column (202) passing through the positive electrode through hole and connected to the core package (101); and A positive electrode column (201), wherein a through hole is provided at the center of the positive electrode column (201), and the positive electrode conductive column (202) passes through the through hole of the positive electrode column (201) and is connected to the positive electrode column (201).

3. A lithium battery structure according to claim 2, characterized in that: The lower part of the positive electrode column (201) passes through the positive electrode through hole and extends into the interior of the shell (1); A positive electrode upper plastic (203) is arranged between the upper part of the positive electrode column (201) and the shell (1), a positive electrode lower plastic (204) is arranged between the lower part of the positive electrode column (201) and the shell (1), and a sealing ring is arranged between the positive electrode upper plastic (203) and the positive electrode column (201), and the sealing ring is pressed by the upper structure of the positive electrode column (201).

4. A lithium battery structure according to claim 1, characterized in that: A negative electrode support is machined at a position where the shell (1) cooperates 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) comprises: Negative busbar (306); a negative electrode conductive column (302) passing through the negative electrode through hole and connected to the core package (101); and A negative electrode column (301) is provided with a through hole at the center of the negative electrode column (301), and the negative electrode conductive column (302) passes through the through hole of the negative electrode column (301) and is connected to the negative electrode column (301).

5. A lithium battery structure according to claim 4, characterized in that: The lower portion of the negative electrode column (301) passes through the negative electrode through hole and extends into the interior of the housing (101); A negative electrode upper plastic (303) is arranged between the upper part of the negative electrode column (301) and the shell (1), a negative electrode lower plastic (304) is arranged between the lower part of the negative electrode column (301) and the shell (1), and a sealing ring is arranged between the negative electrode upper plastic (303) and the negative electrode column (301), and the sealing ring is pressed by the upper structure of the negative electrode column (301).

6. A lithium battery structure according to claim 4 or 5, characterized in that: The middle area of ​​the upper part of the negative electrode column (301) is a copper electrode column (30101), and the remaining area of ​​the negative electrode column (301) is an aluminum electrode column (30102).

7. A lithium battery structure according to claim 1, characterized in that: The core package (101) is coated with an inner insulating film (102) on the outside, and the core package (101) coated with the inner insulating film (102) is embedded in the shell (1).

8. A lithium battery structure according to claim 1, characterized in that: The central area of ​​the top cover (4) is an explosion-proof valve installation area; The explosion-proof valve installation area of ​​the top cover (4) is formed into a grid shape by a plurality of 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 protection film (501).

9. A lithium battery structure according to claim 8, characterized in that: The explosion-proof valve (5) has an explosion-proof valve reinforcing rib (501) which is recessed downward.

10. A lithium battery structure according to claim 9, characterized in that: The explosion-proof valve (5) has notches (502) near the arc-shaped edges on both sides.

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