Square shell battery cell cover plate without anti-explosion valve structure

Abstract

The utility model discloses a square shell battery cell cover plate without an anti-explosion valve structure, which is free of an anti-explosion valve and comprises a lower plastic bottom plate, a polished aluminum sheet, a positive pole, a negative pole, positive upper plastic and negative upper plastic, and two pole mounting holes I and a liquid injection hole I are formed in the lower plastic bottom plate; two pole mounting holes II and a liquid injection hole II are formed in the light aluminum sheet; the light aluminum sheet is arranged on the lower plastic bottom plate; the upper parts of the positive pole and the negative pole are mounted in the two pole mounting holes II in a one-to-one correspondence manner; and each pole and the corresponding pole mounting hole are sealed through a sealing ring. The square shell battery cell cover plate without the anti-explosion valve structure does not comprise an anti-explosion valve, does not need to reserve an anti-explosion valve hole site on the top cover, and does not need to add the anti-explosion valve, an anti-explosion valve film and a welding process of the anti-explosion valve and the top cover, so that the number of parts of the cover plate and the process steps are reduced, the yield of manufacturing the top cover is increased, and the production cost is reduced. And the cost of the top cover is reduced.

Description

Technical Field

[0001] The utility model relates to a square shell battery core cover plate without an explosion-proof valve structure. Background Art

[0002] When conventional lithium batteries and sodium batteries use hard carbon as the negative electrode, the electrode material will produce a volume effect during the deintercalation, and the battery cell will produce a large amount of gas during the process and service, which will determine the structural form of the corresponding battery cell. According to safety requirements, the square and cylindrical battery cell structures must take this situation into account. Therefore, square batteries and cylindrical batteries usually have explosion-proof valves on the outer packaging shell and cover plate (as mentioned in the following documents: CN 220672792U; CN 116259920 B; CN 308617273 S; CN20199749967.2; CN201811574829.7, etc.). However, for batteries with sodium ion systems that do not produce gas and have zero volume effect (CN117855614 A), there is no need to set an explosion-proof valve on the aluminum shell or cover plate of the outer packaging.

[0003] See also Figure 1 and Figure 2 , usually, the outer packaging structural parts of the square shell battery cells of lithium batteries and conventional sodium batteries are mainly the top cover and the aluminum shell, wherein the top cover 1' mainly includes the positive terminal, the negative terminal, the plastic on the positive electrode, the plastic on the negative electrode, the lower plastic bottom plate, the explosion-proof valve 11' and the explosion-proof valve protection film. The explosion-proof valve 11' is welded on the top cover 1' as a separate part, and the top cover 1' needs to reserve the corresponding explosion-proof valve installation hole and the explosion-proof valve exhaust hole 12' (the width of the exhaust hole boss is D), and then the explosion-proof valve 11' and the top cover 1' are connected together, and the cost of the top cover is related to the cost of the explosion-proof valve and the yield of the laser welding process. Therefore, this has always been the pain point of the high cost of the top cover. Utility Model Content

[0004] The purpose of the utility model is to overcome the defects of the prior art and provide a square shell battery cell cover plate without an explosion-proof valve structure, which does not include an explosion-proof valve, does not need to reserve a hole for the explosion-proof valve on the top cover, and does not need to add an explosion-proof valve and an explosion-proof valve film as well as a welding process for the explosion-proof valve and the top cover, thereby reducing the number of parts and process steps of the cover plate, which not only increases the yield rate of the top cover production, but also reduces the cost of the top cover.

[0005] The technical solution to achieve the above purpose is: a square shell battery cover without explosion-proof valve structure, the square shell battery cover without explosion-proof valve, including a lower plastic bottom plate, a plain aluminum sheet, a positive pole, a negative pole, a positive upper plastic and a negative upper plastic, wherein:

[0006] The lower plastic bottom plate is divided into a negative electrode lower plastic and a positive electrode lower plastic on the left and right sides, and two pole mounting holes 1 and a liquid injection hole 1 are provided on the lower plastic bottom plate, and the two pole mounting holes 1 are symmetrically distributed on the negative electrode lower plastic and the positive electrode lower plastic.

[0007] The positive electrode column and the negative electrode column are respectively located above the two electrode column mounting holes 1, and the lower surfaces of the positive electrode column and the negative electrode column are closely attached to the upper surfaces of the positive electrode lower plastic and the negative electrode lower plastic in a one-to-one correspondence;

[0008] The positive electrode upper plastic sleeve is on the upper part of the positive electrode column;

[0009] The negative electrode upper plastic sleeve is on the upper part of the negative electrode column;

[0010] The bare aluminum sheet is provided with two pole mounting holes 2 and one injection hole 2; the bare aluminum sheet is arranged on the lower plastic bottom plate, and the upper parts of the positive pole and the negative pole are mounted in the two pole mounting holes 2 in a one-to-one correspondence;

[0011] Each pole is sealed with a corresponding pole mounting hole by a sealing ring.

[0012] In the above-mentioned square shell battery cell cover plate without an explosion-proof valve structure, the second injection hole is located directly above the first injection hole.

[0013] Compared with the prior art, the square shell battery core cover without explosion-proof valve structure of the utility model has the following beneficial effects:

[0014] (1) The explosion-proof valve-free top cover structure reduces the number of parts and process steps of the cover plate, increases the production yield of the cover plate, and reduces the cost of the top cover;

[0015] (2) The top cover without explosion-proof valve structure reduces the risk of failure due to valve opening caused by accidental bumps or process limitations during the entire battery cell manufacturing process and service period, thereby improving the yield and reliability of the entire battery cell;

[0016] (3) Since there is no need to reserve space for the explosion-proof valve and the exhaust channel in the top cover structure, the width of the pole ear inside the battery cell is increased, which provides space for the design of the pole ear and the pole, thereby improving the current capacity of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram (top view) of a square shell battery cover in the prior art;

[0018] Figure 2 It is a structural schematic diagram of a square shell battery cell cover in the prior art (bottom view);

[0019] Figure 3 It is a three-dimensional structural diagram of the square shell battery cover plate without explosion-proof valve structure of the utility model;

[0020] Figure 4 This is an exploded structural diagram of a square shell battery cell cover plate without an explosion-proof valve structure of the utility model;

[0021] Figure 5 It is a top view of the square shell battery cell cover plate without explosion-proof valve structure of the utility model;

[0022] Figure 6 Schematic diagram of the structure of the light aluminum sheet. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the technical solution of the utility model, the specific implementation method thereof is described in detail below in conjunction with the accompanying drawings:

[0024] See also Figure 3 , Figure 4 , Figure 5 and Figure 6 The best embodiment of the utility model is a square shell battery cover without an explosion-proof valve structure, which specifically includes a lower plastic bottom plate 9, a plain aluminum sheet 5, a positive pole column 3, a negative pole column 4, a positive upper plastic 1 and a negative upper plastic 2.

[0025] The lower plastic bottom plate 9 is divided into a negative electrode lower plastic 8 and a positive electrode lower plastic 7 on the left and right. Two pole mounting holes 91 and a liquid injection hole 92 are provided on the lower plastic bottom plate 9. The two pole mounting holes 91 are symmetrically distributed on the negative electrode lower plastic 8 and the positive electrode lower plastic 7.

[0026] The positive pole post 3 and the negative pole post 4 are respectively located above the two pole mounting holes 91, and the lower surfaces of the positive pole post 3 and the negative pole post 4 are closely attached to the upper surfaces of the positive lower plastic 7 and the negative lower plastic 8 in a one-to-one correspondence; the positive upper plastic 1 is sleeved on the upper part of the positive pole post 3; the negative upper plastic 2 is sleeved on the upper part of the negative pole post 4.

[0027] The bare aluminum sheet 5 is provided with two pole mounting holes 2 51 and one injection hole 2 52; the bare aluminum sheet 5 is arranged on the lower plastic base plate 9, and the upper parts of the positive pole 3 and the negative pole 4 are correspondingly mounted in the two pole mounting holes 2 51; each pole is sealed with the corresponding pole mounting hole by a sealing ring 6. The injection hole 2 52 is located directly above the injection hole 1 92.

[0028] The square shell battery cell cover plate without explosion-proof valve structure of the utility model, the square battery cell top cover does not include explosion-proof valve, there is no need to reserve explosion-proof valve hole on the top cover, and there is no need to add explosion-proof valve and explosion-proof valve film and welding process between explosion-proof valve and top cover. Moreover, since there is no need to reserve space and exhaust channel for explosion-proof valve in the top cover structure, the width space of the pole ear inside the battery cell is increased, and the design space of the pole ear and pole column is improved, so that the current capacity of the battery cell is improved. In the absence of exhaust holes, the width of the pole ear can be increased to a width S that is the width D that can be reduced by the exhaust hole boss, which is a relationship of increase and decrease; the increased space can also be used to simultaneously increase the space occupied by the pole column and the width space of the pole ear;

[0029] Among them, the width space of a single-sided tab can be increased by S=D / 2; the current capacity is increased by Q=K*(D / 2)*T, where K is the coefficient and T is the total thickness of the tab.

[0030] In the top cover manufacturing process, no explosion-proof valve installation holes are processed on the bare aluminum sheet, and the welding process between the explosion-proof valve and the bare aluminum sheet, as well as the processes of stamping, cleaning, and sticking explosion-proof valve protective film are eliminated, making the production of the entire top cover simpler and more efficient, improving the yield rate in the process and reducing the cost of components.

[0031] To sum up, the square shell battery cell cover plate without explosion-proof valve structure of the utility model does not include an explosion-proof valve, does not need to reserve a hole for the explosion-proof valve on the top cover, and does not need to add an explosion-proof valve and an explosion-proof valve film as well as the welding process of the explosion-proof valve and the top cover, thereby reducing the number of parts and process steps of the cover plate, which not only increases the yield rate of the top cover production, but also reduces the cost of the top cover.

[0032] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A square shell battery cell cover plate without explosion-proof valve structure, characterized in that: The square shell battery cell cover has no explosion-proof valve and includes a lower plastic bottom plate, a plain aluminum sheet, a positive pole, a negative pole, a positive upper plastic and a negative upper plastic, wherein: The lower plastic bottom plate is divided into a negative electrode lower plastic and a positive electrode lower plastic on the left and right sides, and two pole mounting holes 1 and a liquid injection hole 1 are provided on the lower plastic bottom plate, and the two pole mounting holes 1 are symmetrically distributed on the negative electrode lower plastic and the positive electrode lower plastic. The positive electrode column and the negative electrode column are respectively located above the two electrode column mounting holes 1, and the lower surfaces of the positive electrode column and the negative electrode column are closely attached to the upper surfaces of the positive electrode lower plastic and the negative electrode lower plastic in a one-to-one correspondence; The positive electrode upper plastic sleeve is on the upper part of the positive electrode column; The negative electrode upper plastic sleeve is on the upper part of the negative electrode column; The bare aluminum sheet is provided with two pole mounting holes 2 and one injection hole 2; the bare aluminum sheet is arranged on the lower plastic bottom plate, and the upper parts of the positive pole and the negative pole are mounted in the two pole mounting holes 2 in a one-to-one correspondence; Each pole is sealed with a corresponding pole mounting hole by a sealing ring.

2. A square shell battery cell cover plate without explosion-proof valve structure according to claim 1, characterized in that: The second injection hole is located directly above the first injection hole.

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