Square battery structure

Abstract

The utility model discloses a square battery structure. The square battery structure comprises an aluminum shell, the double-core bag is arranged in the aluminum shell, one end of the double-core bag is a positive electrode, and the other end of the double-core bag is a negative electrode; the top covers are divided into an anode top cover integrated at the anode end of the square battery structure and a cathode top cover integrated at the cathode end of the square battery structure; the positive pole top cover is connected with a positive pole lug of the double-core bag through a positive pole bracket; and the negative pole top cover is connected with a negative pole lug of the double-core bag through a connecting piece. According to the square battery structure disclosed by the utility model, the double-tab structure of the double-core package is connected through the connecting piece, and the single-tab structure of the double-core package is connected through the bracket, so that the short lap joint risk in the pole piece caused by tab redundancy is effectively reduced, and the safety in the battery core is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium ion batteries, in particular to a square battery structure. Background Art

[0002] With the rapid growth of lithium-ion battery applications in the power and energy storage fields, the production efficiency and automation of lithium batteries are getting higher and higher. During the high-speed production and assembly process, the battery cell tabs are folded and welded to the poles before being put into the shell. The poles and cover plates will compress and fold the tabs, which may cause the tabs to be inserted into the pole pieces or collapse the pole pieces, thereby increasing the risk of short circuits inside the battery cell. Therefore, battery safety has become an important direction for the development of lithium batteries.

[0003] In the prior art, when a "blade" shaped battery is longer and thicker, a double-core package solution is adopted. The thickness of the double-core package's tabs is thicker when they are closed. After being welded to the pole column into the shell, there is a probability that the tabs will be inserted into the pole pieces or collapse the pole pieces, thereby increasing the risk of internal short circuit in the battery cell.

[0004] Therefore, based on the above technical problems, technicians in this field urgently need to develop a square battery structure. Utility Model Content

[0005] The utility model aims to provide a square battery structure, which can effectively reduce the risk of short connection in the pole piece caused by pole ear redundancy and improve the safety inside the battery cell.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] The utility model discloses a square battery structure, which comprises:

[0008] Aluminum shell;

[0009] A double-core bag placed in the aluminum shell, one end of the double-core bag is a positive electrode, and the other end is a negative electrode; and

[0010] A top cover provided at both ends of the square battery structure, wherein the top cover is divided into a positive electrode top cover integrated at one end of the positive electrode of the square battery structure and a negative electrode top cover integrated at one end of the negative electrode of the square battery structure;

[0011] The positive electrode top cover is connected to the positive electrode tab of the double-core package through a positive electrode bracket, and the negative electrode top cover is connected to the negative electrode tab of the double-core package through a connecting piece.

[0012] Furthermore, a core package insulating sheet is provided on the outer side of the double core package.

[0013] Furthermore, the negative electrode tabs of the double-core package are respectively gathered to the two sides of one end of the negative electrode of the square battery structure to form a double-pole tab structure;

[0014] One end of the connecting piece is welded and fixed to the bipolar lug structure, and the other end of the connecting piece is welded and fixed to the negative pole of the negative pole top cover.

[0015] Furthermore, the connecting piece includes:

[0016] A connector header; and

[0017] A connecting piece wing portion formed at one end of the connecting piece head and distributed at intervals;

[0018] The connecting piece is respectively connected to the two negative electrode tabs of the square battery structure through the connecting piece wing;

[0019] The connecting piece head is welded and fixed to the negative pole post of the negative pole top cover.

[0020] Furthermore, the positive electrode tab of the double-core package is gathered to the middle position of one end of the positive electrode of the square battery structure, and forms a bent single-pole tab structure;

[0021] The monopolar ear structure passes through the positive electrode support and extends to the outside of the positive electrode support. The portion of the monopolar ear structure extending to the outside of the positive electrode support is welded and fixed to the positive electrode column of the positive electrode top cover.

[0022] Furthermore, the positive electrode support comprises:

[0023] The bracket body;

[0024] Two inner side plates are formed in the groove of the bracket body, the two inner side plates are arranged obliquely to match the end surface of the double core package, and a channel is reserved between the two inner side plates;

[0025] The bent single-pole ear structure extends from the channel to the outside of the positive electrode support.

[0026] In the above technical solution, the utility model provides a square battery structure, which has the following beneficial effects:

[0027] The square battery structure of the utility model connects the double-pole ear structure of the double-core package through a connecting piece, and connects the single-pole ear structure of the double-core package through a bracket, which effectively reduces the risk of short connection inside the pole piece caused by pole ear redundancy and improves the safety inside the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] 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 utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0029] Figure 1 An exploded diagram of a square battery structure disclosed in an embodiment of the present application;

[0030] Figure 2 A front view of a square battery structure disclosed in an embodiment of the present application;

[0031] Figure 3 for Figure 2 AA section view in the figure;

[0032] Figure 4 for Figure 3 A partial enlarged view of B in the middle;

[0033] Figure 5 for Figure 3 A partial enlarged view of middle C;

[0034] Figure 6 A schematic diagram of the connection structure of a negative electrode top cover and a connecting piece of a square battery structure disclosed in an embodiment of the present application;

[0035] Figure 7 This is a schematic diagram of the connection structure between a positive electrode top cover and a positive electrode support of a square battery structure disclosed in an embodiment of the present application.

[0036] Description of reference numerals:

[0037] 1. Aluminum shell; 2. Double core package; 3. Core package insulation sheet; 4. Positive electrode bracket; 5. Connecting sheet;

[0038] 101, positive electrode top cover; 102, negative electrode top cover; 103, positive electrode pole; 104, negative electrode pole;

[0039] 201, single-pole ear structure; 202, double-pole ear structure;

[0040] 401, inner side plate; 402, passage;

[0041] 501, connecting piece head; 502, connecting piece wing. DETAILED DESCRIPTION

[0042] 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 in conjunction with the accompanying drawings.

[0043] See also Figures 1 to 7 As shown;

[0044] This embodiment discloses a square battery structure, which includes:

[0045] Aluminum shell 1;

[0046] A double-core package 2 is placed in the aluminum shell 1, one end of the double-core package 2 is a positive electrode, and the other end is a negative electrode; and

[0047] The top covers are arranged at both ends of the square battery structure, and the top covers are divided into a positive electrode top cover 101 integrated at one end of the positive electrode of the square battery structure and a negative electrode top cover 102 integrated at one end of the negative electrode of the square battery structure;

[0048] The positive electrode top cover 101 is connected to the positive electrode tab of the double-core package 2 through the positive electrode bracket 4 , and the negative electrode top cover 102 is connected to the negative electrode tab of the double-core package 2 through the connecting piece 5 .

[0049] Specifically, the present embodiment discloses a novel square battery structure, which has an aluminum shell 1 on the outside and a double core pack 2 installed inside; one end of the square battery structure is a positive electrode and the other end is a negative electrode; and a positive electrode top cover 101 and a negative electrode top cover 102 are installed respectively. The present embodiment is further explained and illustrated by taking the double core pack 2 having a double-pole ear structure 202 on the negative electrode side and a single-pole ear structure 201 on the positive electrode side as an example. The negative electrode top cover 102 of the present embodiment is connected to the negative electrode ear through a connecting sheet 5, and the positive electrode top cover 101 is connected to the positive electrode ear through a positive electrode bracket 4.

[0050] Preferably, a core package insulating sheet 3 is provided on the outer side of the double core package 2 of this embodiment.

[0051] Preferably, the negative electrode tabs of the double-core pack 2 of this embodiment are respectively gathered to the two sides of one end of the negative electrode of the square battery structure, and form a double-pole tab structure 202;

[0052] One end of the connecting piece 5 is welded and fixed to the bipolar lug structure 202 , and the other end of the connecting piece is welded and fixed to the negative electrode post 104 of the negative electrode top cover 102 .

[0053] The connecting piece 5 of this embodiment includes:

[0054] Connector head 501; and

[0055] The connecting piece wing portions 502 are formed at one end of the connecting piece head portion 501 and are spaced apart from each other;

[0056] The connecting piece 5 is connected to the two negative electrode tabs of the square battery structure through the connecting piece wing 502;

[0057] The connecting piece head 501 is welded and fixed to the negative electrode post 104 of the negative electrode top cover 102 .

[0058] This embodiment further defines the specific structure of connecting the negative electrode top cover 102 through the connecting piece 5 when the negative electrode is a bipolar ear structure 202. First, the negative electrode tabs of the double-core pack 2 are respectively gathered at both sides of the negative electrode end of the battery cell to form a C-shaped negative bipolar ear structure 202. The connecting piece 5 of this embodiment includes a connecting piece head 501 and two connecting piece wings 502. The connecting piece wings 502 correspond to each negative electrode tab and are welded and fixed. Then, the connecting piece head 501 is welded and fixed to the negative electrode column 104 of the negative electrode top cover 102.

[0059] Preferably, the positive electrode tab of the double-core package 2 of this embodiment is gathered to the middle position of one end of the positive electrode of the square battery structure, and forms a bent single-pole tab structure 201;

[0060] The monopolar ear structure 201 passes through the positive electrode support 4 and extends to the outside of the positive electrode support 4 . The portion of the monopolar ear structure 201 extending to the outside of the positive electrode support 4 is welded and fixed to the positive electrode column 103 of the positive electrode top cover 101 .

[0061] Among them, the positive electrode support 4 of this embodiment includes:

[0062] The bracket body;

[0063] Two inner plates 401 are formed in the groove of the bracket body, the two inner plates 401 are arranged obliquely to match the end surface of the double core package 2, and a channel 402 is reserved between the two inner plates 401;

[0064] The bent single-pole ear structure 201 extends from the channel to the outside of the positive electrode support 4 .

[0065] Based on the above-mentioned double-pole ear structure 202 at one end of the negative electrode, the positive electrode of this embodiment is a single-pole ear structure 201, because the positive electrode of this embodiment is connected to the positive electrode top cover 101 through the positive electrode bracket 4; the positive electrode single-pole ear structure 201 of this embodiment is formed in a bent shape, similar to an S-shaped structure, and the positive electrode bracket 4 is formed with a groove and has two inner plates 401. A channel 402 is reserved between the two inner plates 401 for the single-pole ear structure 201 to pass through, and the single-pole ear structure 201 extending to the outside is welded and fixed to the positive electrode column 103 of the positive electrode top cover 101.

[0066] As an extended implementation method, the above embodiment is a further explanation of the negative terminal being a bipolar ear structure 202 and the positive terminal being a monopolar ear structure 201. Therefore, one end of the negative bipolar ear structure 202 needs to be connected to the negative electrode top cover 102 using a connecting piece 5, and one end of the positive monopolar ear structure 201 needs to be connected to the positive electrode top cover 101 using a positive electrode bracket 4; conversely, if one end of the positive electrode is a bipolar ear structure 202 and one end of the negative electrode is a monopolar ear structure 201, it is necessary to connect the positive electrode top cover 101 through a connecting piece 5 at one end of the positive electrode, and connect the negative electrode top cover 102 at one end of the negative electrode through a negative electrode bracket.

[0067] In the above technical solution, the utility model provides a square battery structure, which has the following beneficial effects:

[0068] The square battery structure of the utility model is connected to the double-pole ear structure 202 of the double-core package 2 through the connecting piece 5, and is connected to the single-pole ear structure 201 of the double-core package 2 through the bracket, which effectively reduces the risk of short connection inside the pole piece caused by pole ear redundancy and improves the safety inside the battery cell.

[0069] The above only describes some exemplary embodiments of the present invention by way of illustration. 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 square battery structure, characterized in that: The square battery structure includes: Aluminum shell (1); A double-core package (2) is placed in the aluminum shell (1), one end of the double-core package (2) is a positive electrode, and the other end is a negative electrode; and Top covers are arranged at both ends of the square battery structure, and the top covers are divided into a positive electrode top cover (101) integrated at one end of the positive electrode of the square battery structure and a negative electrode top cover (102) integrated at one end of the negative electrode of the square battery structure; The positive electrode top cover (101) is connected to the positive electrode tab of the double-core package (2) via a positive electrode bracket (4), and the negative electrode top cover (102) is connected to the negative electrode tab of the double-core package (2) via a connecting piece (5).

2. A square battery structure according to claim 1, characterized in that: A core package insulating sheet (3) is arranged on the outside of the double core package (2).

3. A square battery structure according to claim 1, characterized in that: The negative electrode tabs of the double-core pack (2) are respectively gathered to the two sides of one end of the negative electrode of the square battery structure to form a double-pole tab structure (202); One end of the connecting piece (5) is welded and fixed to the bipolar lug structure (202), and the other end of the connecting piece (5) is welded and fixed to the negative pole post (104) of the negative pole top cover (102).

4. A square battery structure according to claim 3, characterized in that: The connecting piece (5) comprises: A connecting piece header (501); and Connecting piece wing portions (502) formed at one end of the connecting piece head portion (501) and distributed at intervals; The connecting piece (5) is respectively connected to the bipolar ear structure (202) of the square battery structure through the connecting piece wing portion (502); The connecting piece head (501) is fixedly welded to the negative pole post (104) of the negative pole top cover (102).

5. A square battery structure according to claim 1, characterized in that: The positive electrode tab of the double-core package (2) is gathered to the middle position of one end of the positive electrode of the square battery structure to form a bent single-pole tab structure (201); The monopolar ear structure (201) passes through the positive electrode support (4) and extends to the outside of the positive electrode support (4), and the portion of the monopolar ear structure (201) extending to the outside of the positive electrode support (4) is welded and fixed to the positive electrode column (103) of the positive electrode top cover (101).

6. A square battery structure according to claim 5, characterized in that: The positive electrode support (4) comprises: The bracket body; Two inner plates (401) are formed in the groove of the bracket body, the two inner plates (401) are arranged obliquely to match the end surface of the double core package (2), and a channel (402) is reserved between the two inner plates (401); The bent single-pole ear structure (201) extends from the channel (402) to the outside of the positive electrode support (4).

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