Battery cover plate structure and battery

Abstract

The invention provides a battery cover plate structure and a battery, and relates to the technical field of batteries. The two connecting pieces are arranged at the bottom of the cover plate main body at an interval and are respectively used for being connected with a positive lug and a negative lug of a battery cell main body of the battery; the positive pole and the negative pole are arranged in the cover plate main body at an interval and are respectively connected with the two connecting sheets; one ends of the two blocking pieces are respectively connected with the two connecting pieces in a bendable manner, and the two blocking pieces can be respectively pressed on the positive electrode lug and the negative electrode lug; the two separation blades can ensure that the positive tab and the negative tab are effectively fixed, and meanwhile, the extended part of the tab of the battery cell main body after lamination and combination can be folded and pressed between the separation blades and the connecting sheets along with the separation blades, so that the tab cutting process is reduced, the working efficiency is improved, the short circuit risk of the battery cell main body caused by chippings generated during cutting is avoided, and the product quality is improved. And the product percent of pass is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of batteries, and more specifically, relates to a battery cover structure and a battery. Background Art

[0002] Batteries are the power source or storage medium for new energy vehicles, energy storage power stations and new energy applications, among which square batteries are increasingly widely used. At present, in the manufacturing process of existing batteries, the tabs and connecting pieces of the battery cell body are directly welded together. Although the welding connection has a certain reliability, the tabs will also be at risk of detaching from the connecting pieces during long-term use of the battery, and the long-term effective fixation of the tabs cannot be guaranteed. At the same time, after the battery cell body is stacked and assembled, the tabs of the battery cell body will be too long, and part of the tabs will be located outside the range of the connecting piece. The tabs need to be cut, which reduces work efficiency. The generated debris can also easily cause a short circuit in the battery cell body, reducing the product qualification rate. Summary of the Invention

[0003] The purpose of the present invention is to provide a battery cover structure to address the deficiencies in the existing technology, so as to solve the problem proposed in the above background technology that after the pole ears of the existing battery are connected to the connecting pieces of the battery, there is a risk of the pole ears falling off during long-term use. At the same time, after the battery body is stacked and assembled, the pole ears of the battery body will be too long, and part of the pole ears will be located outside the range of the connecting piece, requiring a cutting process for the pole ears, which reduces work efficiency, and the debris generated can easily cause a short circuit in the battery body, reducing the product qualification rate.

[0004] In order to achieve the above object, the present invention provides a battery cover structure, which includes:

[0005] Cover body;

[0006] Two connecting pieces are spaced apart and arranged at the bottom of the cover body, and the two connecting pieces are used to connect to the positive and negative tabs of the battery cell body respectively;

[0007] A positive electrode column and a negative electrode column are spaced apart and arranged in the cover body, and the positive electrode column and the negative electrode column are respectively connected to the two connecting pieces;

[0008] Two blocking pieces, one end of each blocking piece is bendably connected to the two connecting pieces, and each blocking piece can be pressed onto the positive electrode ear and the negative electrode ear.

[0009] Preferably, the positive electrode column is an aluminum column, and the negative electrode column is a copper column.

[0010] Preferably, the blocking piece and the connecting piece on the positive electrode column are respectively an aluminum blocking piece and an aluminum connecting piece, and the blocking piece and the connecting piece on the negative electrode column are respectively a copper blocking piece and a copper connecting piece.

[0011] Preferably, the thickness of the blocking piece on the positive electrode column is 0.1-0.5 mm, and the thickness of the blocking piece on the negative electrode column is 0.1-0.4 mm.

[0012] Preferably, the battery cover structure further includes two lead-out electrodes, which are spaced apart on the top of the cover body. The positive electrode column and the negative electrode column are respectively connected to the two lead-out electrodes, and both of the lead-out electrodes are aluminum pole pieces.

[0013] Preferably, the battery cover structure further includes two bent portions, one end of the two bent portions is connected to one end of the two blocking pieces respectively, and the other end of the two bent portions is connected to the two connecting pieces respectively.

[0014] Preferably, the battery cover structure further includes an explosion-proof valve assembly, and the explosion-proof valve assembly is arranged on the cover body.

[0015] Preferably, at least one liquid injection hole is provided on the cover plate body.

[0016] Preferably, the number of the positive electrode columns and the number of the negative electrode columns are both at least two.

[0017] A battery comprising:

[0018] case;

[0019] A battery cover structure connected to the opening of the shell;

[0020] The battery cell body is arranged in the shell, and the positive electrode ear and the negative electrode ear of the battery cell body are respectively connected to the two connecting pieces.

[0021] The present invention provides a battery cover structure, which has the following beneficial effects: one end of the two baffles of the cover structure can be bendably connected to the two connecting pieces respectively. When the positive electrode ear and the negative electrode ear of the battery cell main body are respectively placed and connected on the two connecting pieces, the other ends of the two baffles can be folded toward the direction of the two connecting pieces and pressed against the positive electrode ear and the negative electrode ear respectively. The two baffles can ensure that the positive electrode ear and the negative electrode ear are effectively fixed. At the same time, the protruding part of the electrode ear of the battery cell main body after the stacking is combined can be folded and pressed between the baffle and the connecting piece as the baffle is folded, which reduces the electrode ear cutting process, improves work efficiency, avoids the risk of short circuit of the battery cell main body caused by debris generated during cutting, and improves the product qualification rate.

[0022] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0024] Figure 1 A schematic diagram of a top view of a cover plate body of a battery cover plate structure according to an embodiment of the present invention is shown;

[0025] Figure 2 A bottom view structural diagram of a cover plate body of a battery cover plate structure according to an embodiment of the present invention is shown;

[0026] Figure 3 A schematic diagram showing the three-dimensional structure of a battery cover structure according to an embodiment of the present invention. Figure 1 ;

[0027] Figure 4 A schematic diagram showing the three-dimensional structure of a battery cover structure according to an embodiment of the present invention. Figure 2 ;

[0028] Figure 5 A bottom view schematically shows the structure of a battery when a cover plate body and a cell body are connected according to an embodiment of the present invention;

[0029] Figure 6 Shown Figure 5 Schematic diagram of the structure in the AA direction;

[0030] Figure 7 Shown Figure 6 The enlarged structural diagram at B in the middle;

[0031] Figure 8 A schematic diagram of the three-dimensional structure of a battery when a cover plate body and a battery cell body are connected according to an embodiment of the present invention is shown;

[0032] Figure 9 A schematic diagram of the three-dimensional structure of a battery cover body and a battery cell body at the initial stage of connection according to one embodiment of the present invention is shown;

[0033] Figure 10 Shown Figure 9 Schematic diagram of the structure in the CC direction;

[0034] Figure 11 Shown Figure 10 The enlarged structural diagram at D in the middle;

[0035] Figure 12A schematic diagram of the three-dimensional structure of a battery cover body and a battery cell body at the initial stage of connection is shown according to an embodiment of the present invention.

[0036] Description of reference numerals:

[0037] 1. Cover plate body; 2. Connecting piece; 3. Battery cell body; 4. Positive pole; 5. Negative pole; 6. Lead-out pole piece; 7. Explosion-proof valve assembly; 8. Liquid injection hole; 9. Baffle. DETAILED DESCRIPTION

[0038] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. Instead, these embodiments are provided to make the present invention more thorough and complete and to fully convey the scope of the present invention to those skilled in the art.

[0039] like Figure 1-4 As shown, the present invention provides a battery cover structure, which includes:

[0040] Cover plate body 1;

[0041] Two connecting pieces 2 are spaced apart and arranged at the bottom of the cover body 1. The two connecting pieces 2 are used to connect to the positive and negative tabs of the battery cell body 3 respectively.

[0042] The positive electrode column 4 and the negative electrode column 5 are spaced apart and arranged in the cover body 1, and the positive electrode column 4 and the negative electrode column 5 are respectively connected to the two connecting pieces 2;

[0043] The two blocking pieces 9 have one end each of which is bendably connected to the two connecting pieces 2 , and the two blocking pieces 9 can be crimped onto the positive electrode tab and the negative electrode tab, respectively.

[0044] Specifically, in order to solve the problem that after the tabs of the existing battery are connected to the connecting pieces of the battery, the tabs are at risk of falling off during long-term use. At the same time, after the battery body is laminated, the tabs of the battery body will be too long, and part of the tabs will be outside the range of the connecting piece, which requires a cutting process for the tabs, reducing work efficiency, and the generated debris will easily cause a short circuit in the battery body, reducing the product qualification rate, the present invention provides a battery cover structure, which can be used on square batteries, and one end of the two baffles 9 of the cover structure is respectively connected to the two The connecting piece 2 can be bent and connected. When the positive ear and the negative ear of the battery cell main body 3 are respectively placed and connected on the two connecting pieces 2, the other ends of the two blocking pieces 9 can be folded toward the two connecting pieces 2 and pressed against the positive ear and the negative ear respectively. The two blocking pieces 9 can ensure that the positive ear and the negative ear are effectively fixed. At the same time, the protruding part of the ear of the battery cell main body 3 after the stacking combination can be folded and pressed between the blocking piece 9 and the connecting piece 2 along with the blocking piece 9, which reduces the ear cutting process, improves work efficiency, avoids the risk of short circuit of the battery cell main body caused by debris generated during cutting, and improves the product qualification rate.

[0045] Preferably, the positive electrode column 4 is an aluminum column, and the negative electrode column 5 is a copper column.

[0046] Preferably, the blocking piece 9 and the connecting piece 2 on the positive electrode column 4 are respectively an aluminum blocking piece and an aluminum connecting piece, and the blocking piece 9 and the connecting piece 2 on the negative electrode column 5 are respectively a copper blocking piece and a copper connecting piece.

[0047] Specifically, the positive electrode column 4 and the negative electrode column 5 are respectively connected to the two blocking pieces 9 by laser welding, so as to improve the firmness of the connection and play the role of fixing and electrical connection.

[0048] Preferably, the thickness of the baffle 9 on the positive electrode column 4 is 0.1-0.5 mm, and the thickness of the baffle 9 on the negative electrode column 5 is 0.1-0.4 mm.

[0049] Preferably, the battery cover structure further includes two lead-out pole pieces 6, which are spaced apart on the top of the cover body 1. The positive pole column 4 and the negative pole column 5 are respectively connected to the two lead-out pole pieces 6, and both lead-out pole pieces 6 are aluminum pole pieces.

[0050] Specifically, the positive electrode column 4 and the negative electrode column 5 are respectively connected to the two lead-out electrode sheets 6 by laser welding, so as to improve the firmness of the connection and play the role of fixation and electrical connection.

[0051] Preferably, the battery cover structure further includes two bent portions, one end of the two bent portions is connected to one end of the two blocking sheets 9 respectively, and the other end of the two bent portions is connected to the two connecting sheets 2 respectively.

[0052] Preferably, the battery cover structure further includes an explosion-proof valve assembly 7 , which is disposed on the cover body 1 .

[0053] Specifically, a small hole is provided on the patch of the explosion-proof valve assembly 7 to ensure the breathing function of the explosion-proof valve.

[0054] Preferably, at least one liquid injection hole 8 is provided on the cover plate body 1 .

[0055] Preferably, the number of the positive electrode columns 4 and the number of the negative electrode columns 5 are both at least two.

[0056] Specifically, the positive electrode column 4 and the negative electrode column 5 are both double-column lead-out, which can effectively increase the overflow surface and improve the charge and discharge capacity of the battery cell.

[0057] Preferably, a polarity mark is provided on the cover column 1 .

[0058] like Figure 5-12 As shown, a battery comprises:

[0059] case;

[0060] A battery cover structure connected to the opening of the shell;

[0061] The battery cell body 3 is arranged in the shell, and the positive electrode ear and the negative electrode ear of the battery cell body 3 are respectively connected to the two connecting pieces 2.

[0062] Specifically, the battery cover structure is welded to the shell and can form the main structure of the square battery, which is suitable for the square battery body 3 and can be applied to lithium batteries and sodium batteries.

[0063] In summary, in the process of connecting the battery cover structure provided by the present invention to the battery shell, the initial baffle 9 and the cover body 1 form a bending angle of 10-30 degrees, which is convenient for the positive electrode ear and the negative electrode ear to be placed and connected on the two connecting pieces 2 respectively, and are welded to the two connecting pieces 2 respectively. After welding, the two baffles 9 are bent 180 degrees and pressed on the positive electrode ear and the negative electrode ear respectively to ensure that the positive electrode ear and the negative electrode ear are effectively fixed. At the same time, the part of the ear that grows during stacking is bent and fixed between the baffle 9 and the connecting piece 2, which reduces the ear cutting process, improves work efficiency, avoids the risk of short circuit of the battery cell body caused by debris generated during cutting, and improves the product qualification rate.

[0064] While various embodiments of the present invention have been described above, the above description is intended to be illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A battery cover structure, characterized in that: The cover plate structure includes: Cover body; Two connecting pieces are spaced apart and arranged at the bottom of the cover body, and the two connecting pieces are used to connect to the positive and negative tabs of the battery cell body respectively; A positive electrode column and a negative electrode column are spaced apart and arranged in the cover body, and the positive electrode column and the negative electrode column are respectively connected to the two connecting pieces; Two blocking pieces, one end of each blocking piece is bendably connected to the two connecting pieces, and each blocking piece can be pressed onto the positive electrode ear and the negative electrode ear.

2. A battery cover structure according to claim 1, characterized in that: The positive pole column is an aluminum column, and the negative pole column is a copper column.

3. The battery cover structure according to claim 1, characterized in that: The blocking piece and the connecting piece on the positive electrode column are respectively an aluminum blocking piece and an aluminum connecting piece, and the blocking piece and the connecting piece on the negative electrode column are respectively a copper blocking piece and a copper connecting piece.

4. The battery cover structure according to claim 1, characterized in that: The thickness of the blocking piece on the positive electrode column is 0.1-0.5 mm, and the thickness of the blocking piece on the negative electrode column is 0.1-0.4 mm.

5. The battery cover structure according to claim 1, characterized in that: The battery cover structure further includes two lead-out pole pieces, which are spaced apart and arranged on the top of the cover body. The positive pole column and the negative pole column are respectively connected to the two lead-out pole pieces, and both lead-out pole pieces are aluminum pole pieces.

6. The battery cover structure according to claim 1, characterized in that: The battery cover structure further includes two bent portions, one end of each of the bent portions is connected to one end of each of the two blocking sheets, and the other end of each of the bent portions is connected to the two connecting sheets.

7. The battery cover structure according to claim 1, characterized in that: The battery cover structure further includes an explosion-proof valve assembly, which is arranged on the cover body.

8. The battery cover structure according to claim 1, characterized in that: The cover plate body is provided with at least one liquid injection hole.

9. A battery, characterized in that: include: case; A battery cover structure according to any one of claims 1 to 8, connected to the opening of the housing; The battery cell body is arranged in the shell, and the positive electrode ear and the negative electrode ear of the battery cell body are respectively connected to the two connecting pieces.

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