Bipolar battery

Abstract

The utility model relates to the technical field of batteries, and discloses a bipolar battery, which comprises a battery cell, a shell, an upper cover and a fixing device, the shell and the upper cover are used for wrapping the battery cell, the fixing device comprises a lower fixing frame and an upper fixing frame, the upper fixing frame is arranged on the bottom surface of the upper cover, the lower fixing frame is arranged at the lower end of the battery cell, and the upper fixing frame is arranged on the lower end of the battery cell. The lower fixing frame is used for limiting and fixing the battery cell and is provided with a penetrating structure; the upper fixing frame is arranged on the bottom surface of the upper cover, the lower fixing frame is arranged at the lower end of the battery cell, the battery cell can be limited up, down, left and right at the same time, the problem that the battery cell is loosened is avoided, meanwhile, the lower fixing frame is provided with a penetrating structure, the lower fixing frame can be soaked by electrolyte, the circulation capacity of the electrolyte is improved, and the service life of the battery cell is prolonged. And the performance of the battery is improved.

Description

Technical Field

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

[0002] In related technologies, the pole pieces and separators of bipolar batteries are cross-stacked and fixed with adhesives. However, the electrolyte in the battery is corrosive, and the adhesive is easily corroded, resulting in adhesion failure, which in turn causes the battery cells to become loose and the battery life to be shortened. Utility Model Content

[0003] The purpose of the utility model is to solve the problem in the prior art that the pole pieces and separators of bipolar batteries are prone to adhesion failure, which in turn causes the battery cells to become loose and affects the battery life, and to provide a bipolar battery that can effectively prevent the battery cells from becoming loose.

[0004] In order to achieve the above object, the utility model provides a bipolar battery, comprising:

[0005] A battery cell, a shell and an upper cover for wrapping the battery cell, and a fixing device, the fixing device including a lower fixing frame and an upper fixing frame, the upper fixing frame is installed on the bottom surface of the upper cover, the lower fixing frame is arranged at the lower end of the battery cell to limit the battery cell, and the lower fixing frame has a through structure.

[0006] Preferably, the lower fixing frame includes a square frame, a support plate is provided inside the square frame, the square frame protrudes from the upper and lower surfaces of the support plate, the upper part of the inner wall of the square frame fits the outer wall of the battery cell, the outer wall of the square frame fits the inner wall of the shell, and a through hole is opened on the support plate.

[0007] Preferably, the upper fixing frame includes a first group of isolation plates, which are arranged as two parallel and spaced isolation plates 1, and the two ends of the isolation plate 1 close to the side of the battery cell are arranged as rounded corners, and the isolation plate 1 is fixed to the bottom surface of the upper cover along the thickness direction of the battery cell.

[0008] Preferably, a positive electrode connecting piece and a negative electrode connecting piece are provided between the upper cover and the battery cell, and the positive electrode connecting piece is provided with a first connecting portion and a second connecting portion connected at an angle to each other, the first connecting portion being connected to the positive electrode column of the upper cover, the first connecting portion being provided between the two separators, and the second connecting portion being connected to the positive end of the battery cell;

[0009] The negative electrode connecting piece is provided with a third connecting portion and a fourth connecting portion connected at an angle to each other, the third connecting portion is connected to the negative pole of the upper cover, the fourth connecting portion is provided between the two isolation plates, and the fourth connecting portion is connected to the negative end of the battery cell.

[0010] Preferably, the angle formed by the first connection portion and the second connection portion is in the range of 90° to 120°, and the angle formed by the third connection portion and the fourth connection portion is in the range of 90° to 120°.

[0011] Preferably, the upper fixing frame also includes a second group of isolation plates, the second group of isolation plates includes isolation plate 2 and isolation plate 3 arranged in parallel and at intervals, the isolation plate 2 is arranged between the shell and the positive end of the battery cell, and the isolation plate 3 is arranged between the shell and the negative end of the battery cell.

[0012] Preferably, a receiving groove 1 for fitting the second connecting part is opened on the side of the second isolation plate close to the battery cell, and the second connecting part is arranged in the receiving groove 1; a receiving groove 2 for fitting the fourth connecting part is opened on the side of the third isolation plate close to the battery cell, and the fourth connecting part is arranged in the receiving groove 2.

[0013] Preferably, the battery cell is configured to have multiple square pole pieces and separators cross-stacked along the thickness direction of the battery cell, the pole pieces are configured to have positive electrode coating and negative electrode coating on both sides of the substrate respectively, and the positive electrode coating is close to the second connecting portion.

[0014] Preferably, the bipolar battery further includes a bushing, which wraps the lower fixing frame, the battery cell, the second connecting portion and the fourth connecting portion.

[0015] Preferably, the upper cover is sealed with the housing, and an explosion-proof valve and a liquid injection hole are provided on the upper cover.

[0016] Through the above technical solution, by arranging an upper fixing frame on the bottom surface of the upper cover and a lower fixing frame at the lower end of the battery cell, the battery cell can be limited in the upper, lower, left and right directions at the same time, thereby avoiding the problem of looseness of the battery cell. At the same time, the lower fixing frame is provided with a through structure, which can enable the lower fixing frame to be infiltrated by the electrolyte, thereby improving the circulation capacity of the electrolyte and thus improving the performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of a bipolar battery provided by the utility model;

[0018] Figure 2 This is a structural schematic diagram of a lower fixing frame of a bipolar battery provided by the utility model;

[0019] Figure 3 This is a structural schematic diagram of a separator plate 1 of a bipolar battery provided by the utility model;

[0020] Figure 4 This is a structural schematic diagram of a positive electrode connecting piece of a bipolar battery provided by the utility model;

[0021] Figure 5 This is a structural schematic diagram of a second separator of a bipolar battery provided by the utility model;

[0022] Figure 6 It is a structural schematic diagram of a pole piece of a bipolar battery provided by the utility model.

[0023] Description of Reference Numerals

[0024] 1. Upper cover; 11. Negative pole; 12. Positive pole; 13. Explosion-proof valve; 14. Liquid injection hole; 21. Isolation plate 1; 22. Isolation plate 2; 23. Lower fixing frame; 24. Square frame; 25. Support plate; 26. Through hole; 27. Receiving groove 1; 28. Isolation plate 3; 3. Bushing; 41. Positive electrode connecting piece; 411. First connecting part; 412. Second connecting part; 42. Negative electrode connecting piece; 5. Battery cell; 51. Pole piece; 511. Negative electrode coating; 512. Base material; 513. Positive electrode coating; 52. Isolation piece; 6. Shell. DETAILED DESCRIPTION

[0025] The following is a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0026] As mentioned above, the utility model provides a bipolar battery, which can simultaneously limit the upper, lower, left and right positions of the battery cell by arranging an upper fixing frame on the bottom surface of the upper cover and a lower fixing frame at the lower end of the battery cell, thereby avoiding the problem of the battery cell becoming loose.

[0027] like Figure 1 As shown, in the present invention, the bipolar battery includes a battery cell 5, a shell 6 and an upper cover 1 for wrapping the battery cell 5, and a fixing device, the fixing device includes a lower fixing frame 23 and an upper fixing frame, the upper fixing frame is installed on the bottom surface of the upper cover 1, the lower fixing frame 23 is arranged at the lower end of the battery cell 5 to limit the battery cell 5, and the lower fixing frame 23 has a through structure.

[0028] The upper fixing frame and the lower fixing frame 23 respectively fix and limit the battery cell 5 at the top and bottom of the battery cell 5, leaving enough space on the sides of the battery cell 5 for heat dissipation. The upper fixing frame is installed at the bottom end of the upper cover 1. Even if the upper cover 1 is repeatedly removed from or installed on the shell 6, there is no need to adjust the position of the upper fixing frame again. The lower fixing frame 23 is provided with a through structure, which can enable the lower fixing frame 23 to be immersed in the electrolyte, thereby improving the circulation capacity of the electrolyte and thus improving the performance of the battery. The shell 6 and the upper cover 1 provide sealing protection for the battery cell 5. According to the use environment, the shell 6 and the upper cover 1 can select conductors, semiconductors and insulators. Materials, such as aluminum, stainless steel and plastic, can be selected.

[0029] like Figure 2 As shown, in one embodiment of the present invention, the lower fixing frame 23 includes a square frame 24, and a support plate 25 is provided inside the square frame 24. The square frame 24 protrudes from the upper and lower surfaces of the support plate 25. The upper part of the inner wall of the square frame 24 fits the outer wall of the battery cell 5, and the outer wall of the square frame 24 fits the inner wall of the shell 6, thereby ensuring the stability of the lower end of the battery cell 5; a through hole 26 is opened on the support plate 25, and the electrolyte can pass through the through hole 26 to immerse the support plate 25 in the electrolyte, thereby improving the circulation capacity of the electrolyte, that is, improving the performance of the battery. In order to adapt to the environment of immersion in the electrolyte, the lower fixing frame 23 can be selected from corrosion-resistant materials, such as polypropylene.

[0030] Combine Figure 1 、 3 As shown, in the present invention, the upper fixing frame includes a first group of isolation plates, which are configured as two parallel and spaced isolation plates 21 to keep the battery cell 5 parallel and not tilted relative to the upper cover 1, thereby maintaining the stability of the battery cell 5; the two ends of the isolation plate 21 close to the side of the battery cell 5 are configured as rounded corners to avoid damage to the sharp ends of the battery cell 5, and the isolation plate 21 is configured on the bottom surface of the battery cell 5 along the thickness direction of the battery cell 5 to limit the upper and lower directions of the battery cell 5.

[0031] Combine Figure 1 、 4 As shown, in the present invention, a positive electrode connecting piece 41 and a negative electrode connecting piece 42 are provided between the upper cover 1 and the battery cell 5. The positive electrode connecting piece 41 is provided with a first connecting portion 411 and a second connecting portion 412 connected at an angle to each other, and the connection is provided with an arc connection. The first connecting portion 411 is connected to the positive electrode column 12 of the upper cover 1, and the first connecting portion 411 is provided between the two isolation plates 21. The second connecting portion 412 is connected to the positive end of the battery cell 5.

[0032] The negative electrode connecting piece 42 is configured as a third connecting portion and a fourth connecting portion connected at an angle to each other, and the connection is configured as an arc connection. The third connecting portion is connected to the negative electrode column 11 of the upper cover 1, and the fourth connecting portion is arranged between the two isolation plates 21. The fourth connecting portion is connected to the negative end of the battery cell 5. The negative electrode connecting piece 42 and the positive electrode connecting piece 41 are symmetrically arranged with each other. Usually, the two are made of aluminum conductive foil.

[0033] In one embodiment of the present invention, according to the positions of the positive electrode column 12 and the negative electrode column 11, the angle formed by the first connecting portion 411 and the second connecting portion 412 is in the range of 90° to 120°, and the angle formed by the third connecting portion and the fourth connecting portion is in the range of 90° to 120°.

[0034] Combine Figure 1 、 5 As shown, in the present invention, the upper fixing frame also includes a second group of isolation plates, which include an isolation plate 22 and an isolation plate 3 28 that are parallel and spaced apart. The isolation plate 22 is arranged between the shell 6 and the positive end of the battery cell 5, and the isolation plate 3 28 is arranged between the shell 6 and the negative end of the battery cell 5, and is used to limit the battery cell 5 in the left and right directions.

[0035] Specifically, the side of the isolation plate 22 close to the battery cell 5 is provided with a receiving groove 27 for fitting the second connecting part 412, and the second connecting part 412 is arranged in the receiving groove 27. The side of the isolation plate 3 28 close to the battery cell 5 is provided with a receiving groove 2 for fitting the fourth connecting part, and the fourth connecting part is arranged in the receiving groove 2, which is conducive to maintaining stability between the isolation plate 22 and the isolation plate 3 28 and the battery cell 5.

[0036] Combine Figure 1 、 6 As shown, in this embodiment, the battery cell 5 is configured to have multiple square pole pieces 51 and isolation pieces 52 cross-stacked along the thickness direction of the battery cell 5, and different numbers of stacked pole pieces 51 constitute batteries with different rated voltages, so that they can be used in various scenarios. The pole pieces 51 are configured to have a positive electrode coating 513 and a negative electrode coating 511 coated on both sides of a substrate 512, respectively, and the positive electrode coating 513 is close to the second connecting portion 412.

[0037] Back to Figure 1It can be seen that in the present invention, the bipolar battery further comprises a bushing 3, which wraps the lower fixing frame 23, the battery cell 5, the second connecting portion 412 and the fourth connecting portion. The bushing 3 has a sealing effect on the battery cell 5 and a reinforcing effect on the battery cell 5 and the fixing device. The first connecting portion 411 and the third connecting portion extend from the inside of the bushing 3 to the outside of the bushing 3. The bushing 2 needs to be made of corrosion-resistant material, such as PP or PET.

[0038] In one embodiment of the present invention, the upper cover 1 is sealed and installed with the shell 6. The upper cover 1 is provided with an explosion-proof valve 13 and a liquid injection hole 14. The explosion-proof valve 13 can improve the explosion-proof performance of the battery. The liquid injection hole 14 is used to input electrolyte into the battery.

[0039] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Within the technical concept of the present invention, various simple variations of the technical solution of the present invention may be made. To avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple variations and combinations should also be considered as disclosed in the present invention and fall within the scope of protection of the present invention.

Claims

1. A bipolar battery, characterized in that: include: A battery cell (5), a shell (6) for wrapping the battery cell (5), an upper cover (1), and a fixing device, the fixing device comprising a lower fixing frame (23) and an upper fixing frame, the upper fixing frame being mounted on the bottom surface of the upper cover (1), the lower fixing frame (23) being arranged at the lower end of the battery cell (5) for fixing and limiting the battery cell (5), and the lower fixing frame (23) having a through structure; The lower fixing frame (23) includes a square frame (24), a support plate (25) is provided inside the square frame (24), the square frame (24) protrudes from the upper surface and the lower surface of the support plate (25), the upper part of the inner wall of the square frame (24) is in contact with the outer wall of the battery cell (5), the outer wall of the square frame (24) is in contact with the inner wall of the shell (6), and a through hole (26) is provided on the support plate (25).

2. The bipolar battery according to claim 1, wherein: The upper fixing frame includes a first group of isolation plates, wherein the first group of isolation plates is configured as two parallel and spaced isolation plates (21), both ends of the isolation plate (21) close to the side of the battery cell (5) are configured as rounded corners, and the isolation plate (21) is configured on the bottom surface of the battery cell (5) along the thickness direction of the battery cell (5).

3. The bipolar battery according to claim 2, wherein: A positive electrode connecting piece (41) and a negative electrode connecting piece (42) are provided between the upper cover (1) and the battery cell (5); the positive electrode connecting piece (41) is provided as a first connecting portion (411) and a second connecting portion (412) connected to each other at an angle; the first connecting portion (411) is connected to the positive electrode column (12) of the upper cover (1); the first connecting portion (411) is provided between the two isolation plates (21); and the second connecting portion (412) is connected to the positive terminal of the battery cell (5); The negative electrode connecting piece (42) is provided with a third connecting portion and a fourth connecting portion connected at an angle to each other, the third connecting portion being connected to the negative electrode column (11) of the upper cover (1), the fourth connecting portion being provided between the two isolation plates (21), and the fourth connecting portion being connected to the negative end of the battery cell (5).

4. The bipolar battery according to claim 3, wherein The angle formed by the first connecting portion (411) and the second connecting portion (412) is in the range of 90° to 120°, and the angle formed by the third connecting portion and the fourth connecting portion is in the range of 90° to 120°.

5. The bipolar battery according to claim 3, wherein: The upper fixing frame also includes a second group of isolation plates, which includes an isolation plate 2 (22) and an isolation plate 3 (28) that are arranged in parallel and spaced apart. The isolation plate 2 (22) is arranged between the shell (6) and the positive terminal of the battery cell (5), and the isolation plate 3 (28) is arranged between the shell (6) and the negative terminal of the battery cell (5).

6. The bipolar battery according to claim 5, wherein: The second isolation plate (22) is provided with a first receiving groove (27) for fitting the second connecting portion (412) on a side close to the battery cell (5), and the second connecting portion (412) is arranged in the first receiving groove (27). The third isolation plate (28) is provided with a second receiving groove for fitting the fourth connecting portion on a side close to the battery cell (5), and the fourth connecting portion is arranged in the second receiving groove.

7. The bipolar battery according to claim 6, wherein: The battery cell (5) is configured as a plurality of square pole pieces (51) and separators (52) cross-stacked along the thickness direction of the battery cell (5); the pole pieces (51) are configured as substrates (512) with positive electrode coatings (513) and negative electrode coatings (511) coated on both sides thereof, respectively; the positive electrode coating (513) is close to the second connecting portion (412).

8. The bipolar battery according to any one of claims 1 to 7, wherein: The bipolar battery further comprises a bushing (3), wherein the bushing (3) wraps the lower fixing frame (23), the battery cell (5), the second connecting portion (412), and the fourth connecting portion.

9. The bipolar battery according to claim 8, wherein: The upper cover (1) is sealed and mounted on the housing (6); an explosion-proof valve (13) and a liquid injection hole (14) are provided on the upper cover (1).

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