Battery top cover and battery monomer

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery top cover and a battery monomer. The battery top cover comprises a top cover body and a sealing piece, a liquid injection hole is formed in the top cover body, and a buffer groove is formed in the periphery of the liquid injection hole and located in the top end face of the top cover body. The edge of the liquid injection hole in the top end face of the top cover body is connected with the peripheral side of the sealing piece in a welded mode, and the buffering groove is used for buffering stress generated by connection of the top cover body and the sealing piece. According to the battery top cover, the deformation area of the top cover body and the sealing element can be controlled within the range of the buffer groove; the buffer groove can improve welding heat dissipation of the top cover body, and deformation of the top cover body and the sealing piece is further reduced. The buffer groove is formed in the top cover body, the arrangement is simple and convenient, and the cost is low. The battery monomer comprises a shell, a battery cell and the battery top cover, and is high in structural strength, simple to process and low in cost.

Description

Technical Field

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

[0002] During the lithium-ion battery manufacturing process, after the electrolyte injection process is complete, the electrolyte injection hole in the battery cover must be sealed with aluminum nails and laser-sealed to prevent electrolyte leakage. However, when the aluminum nails are installed and laser-welded to seal the electrolyte injection hole, the high temperature generated by the welding process spreads to the surrounding area. As the temperature rises, the battery cover and the aluminum nails will deform, affecting the structural strength and product performance of the battery.

[0003] Therefore, there is an urgent need to provide a battery top cover and a battery cell to solve the above problems. Utility Model Content

[0004] The first object of the present utility model is to provide a battery top cover, which can reduce the deformation of the top cover body and the sealing member, and improve the structural strength and product performance of the battery top cover.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] Battery cover, including:

[0007] A top cover body, wherein the top cover body is provided with a liquid injection hole, a buffer groove is provided on the outer circumference of the liquid injection hole, and the buffer groove is located on the top surface of the top cover body;

[0008] A sealing member is provided, wherein the sealing member is sealed at the liquid injection hole, the edge of the liquid injection hole on the top surface of the top cover body is welded to the outer peripheral side of the sealing member, and the buffer groove is used to buffer the stress generated by the connection between the top cover body and the sealing member.

[0009] As an optional technical solution for the battery top cover, the liquid injection hole includes a sinking groove and a through hole, the through hole is located at the bottom of the sinking groove, the sealing member is annular and adapted to the shape of the sinking groove, and the sealing member is located in the sinking groove.

[0010] As an optional technical solution for the battery top cover, the top surface of the sealing member is flush with the top surface of the top cover body.

[0011] As an optional technical solution for the battery top cover, the cross-sectional size of the sealing member gradually decreases from top to bottom.

[0012] As an optional technical solution for the battery top cover, the buffer groove is an annular groove connected end to end.

[0013] As an optional technical solution for the battery top cover, the annular groove is a contoured groove, and the shape of the annular groove is the same as that of the sinking groove.

[0014] As an optional technical solution for the battery top cover, there are multiple annular grooves, and the multiple annular grooves are concentrically arranged.

[0015] As an optional technical solution for the battery top cover, the width of the annular groove ranges from 0.3 mm to 3.0 mm.

[0016] As an optional technical solution for the battery top cover, the depth of the annular groove ranges from 0.3 mm to 1.0 mm.

[0017] The second object of the present invention is to provide a battery cell with high structural strength and good product performance.

[0018] To achieve this purpose, the present invention adopts the following technical solutions:

[0019] A battery cell is characterized by comprising a shell, a battery cell and the above-mentioned battery top cover, wherein the battery cell is located in the shell and the battery top cover is sealed at the shell opening.

[0020] Beneficial effects of the utility model:

[0021] The battery top cover provided by the utility model includes a top cover body and a sealing member. An injection hole is provided on the top cover body for injecting electrolyte into the battery shell. The sealing member is sealed in the injection hole, and the edge of the injection hole on the top surface of the top cover body is welded to the outer peripheral side of the sealing member to prevent leakage of the electrolyte. A buffer groove is provided on the outer circumference of the injection hole, and the buffer groove is located on the top surface of the top cover body, so that the high temperature generated during the welding process of the top cover body and the sealing member spreads to the buffer groove and then accumulates in the buffer groove, preventing the temperature from continuously diffusing to the periphery, buffering and dispersing the welding stress and deformation of the top cover body and the sealing member, and balancing the residual stress, thereby controlling the deformation area of the top cover body and the sealing member within the range of the buffer groove; the buffer groove can also improve the welding heat dissipation of the top cover body, further reducing the deformation of the top cover body and the sealing member. In addition, the buffer groove is provided on the top cover body, which is simple, convenient and low-cost.

[0022] The battery cell provided in this embodiment includes a shell, a battery cell and the above-mentioned battery top cover, and has high structural strength, simple processing and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a partial schematic diagram of a battery top cover provided by an embodiment of the present utility model;

[0024] Figure 2 It is an exploded view of the battery top cover provided by an embodiment of the present utility model.

[0025] In the picture:

[0026] 100, top cover body; 110, injection hole; 111, sinking groove; 112, through hole; 120, buffer groove; 200, seal; 300, explosion-proof valve; 400, explosion-proof film; 500, pole; 600, lower plastic; 700, sealing ring; 800, upper plastic; 900, rivet block. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0028] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0029] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0030] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0031] The battery top cover provided in this embodiment can reduce the deformation of the top cover body 100 and the sealing member 200 , thereby improving the structural strength and product performance of the battery top cover.

[0032] Specific as Figure 1 and Figure 2 As shown, the battery top cover includes a top cover body 100 and a sealing member 200. The top cover body 100 is provided with a liquid injection hole 110, and a buffer groove 120 is provided around the outer periphery of the liquid injection hole 110. The buffer groove 120 is located on the top surface of the top cover body 100. The sealing member 200 seals the liquid injection hole 110. The edge of the liquid injection hole 110 on the top surface of the top cover body 100 is welded to the outer periphery of the sealing member 200. The buffer groove 120 is used to buffer the stress generated by the connection between the top cover body 100 and the sealing member 200.

[0033] Based on the above design, the top cover body 100 is provided with an injection hole 110 for injecting electrolyte into the battery case. A seal 200 seals the injection hole 110. The edge of the injection hole 110 on the top surface of the top cover body 100 is welded to the outer periphery of the seal 200 to prevent electrolyte leakage. A buffer groove 120 is provided around the injection hole 110. The buffer groove 120 is located on the top surface of the top cover body 100. This allows the high temperature generated during the welding process between the top cover body 100 and the seal 200 to spread to the buffer groove 120 and then accumulate there, preventing the temperature from continuously spreading outward. This buffers and disperses the welding stress and deformation of the top cover body 100 and the seal 200, and balances the residual stress. This limits the deformation area of the top cover body 100 and the seal 200 to within the buffer groove 120. The buffer groove 120 also improves the heat dissipation during the welding of the top cover body 100, further reducing the deformation of the top cover body 100 and the seal 200. Furthermore, the buffer groove 120 is provided on the top cover body 100 , which is simple, convenient and low-cost.

[0034] Furthermore, the injection hole 110 includes a sinking groove 111 and a through hole 112. The through hole 112 is located at the bottom of the sinking groove 111. The seal 200 is annular and adapted to the shape of the sinking groove 111. The seal 200 is located in the sinking groove 111, which can not only position and install the seal 200, but also increase the sealing performance and structural compactness of the battery top cover.

[0035] In order to further increase the structural compactness and welding convenience of the battery top cover, the top surface of the sealing member 200 is flush with the top surface of the top cover body 100 .

[0036] In this embodiment, the cross-sectional dimension of the sealing member 200 gradually decreases from top to bottom, so as to facilitate the insertion of the sealing member 200 into the sinking groove 111. Of course, the cross-sectional dimension of the sinking groove 111 also gradually decreases from top to bottom.

[0037] In some embodiments, the buffer trough 120 includes a plurality of trough segments, and the plurality of trough segments are spaced apart along the outer circumference of the sinking trough 111 .

[0038] In some other embodiments, in order to ensure the buffering effect of the buffer groove 120 , the buffer groove 120 is an annular groove connected end to end, that is, the annular groove is continuously arranged around the outer circumference of the sinking groove 111 .

[0039] In order to ensure that all parts of the annular groove have the same buffering effect on the stress and deformation of the outer periphery of the sinking groove 111 , the annular groove is a contoured groove, and the shape of the annular groove is the same as that of the sinking groove 111 .

[0040] Furthermore, in order to increase the buffering effect, there are multiple annular grooves, and the multiple annular grooves are concentrically arranged.

[0041] Optionally, the width of the annular groove ranges from 0.3 mm to 3.0 mm. For example, the width can be 0.3 mm, 0.6 mm, 0.9 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2.1 mm, 2.4 mm, 2.7 mm, or 3.0 mm. The present invention does not impose any specific restrictions on the width of the annular groove, and the width can be set according to actual needs.

[0042] Optionally, the depth of the annular groove ranges from 0.3 mm to 1.0 mm. For example, it can be 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1.0 mm. The present invention does not impose any specific limitation on the depth of the annular groove, and it can be set according to actual needs.

[0043] Continue as Figure 2 As shown, the battery top cover further includes an explosion-proof valve 300 and an explosion-proof film 400 . The explosion-proof valve 300 is located on one side of the liquid injection hole 110 along the length direction of the top cover body 100 , and the explosion-proof film 400 is attached to the top surface of the explosion-proof valve 300 .

[0044] The battery cover also includes two poles 500. The cover body 100 is provided with two mounting holes, which are located on the side of the injection hole 110 opposite to the explosion-proof valve 300 along the length direction of the cover body 100 for mounting the poles 500.

[0045] One of the two poles 500 is a positive pole, and the other is a negative pole.

[0046] Each pole 500 includes a column and a base. The column is connected to the base. A mounting hole is formed in the column. The base abuts against the bottom of the top cover body 100 .

[0047] Furthermore, the battery top cover also includes a lower plastic 600 , which is attached to the bottom of the top cover body 100 . The column passes through the lower plastic 600 and the top cover body 100 in sequence, and the base abuts against the bottom of the lower plastic 600 .

[0048] In order to improve the sealing performance of the battery top cover, the battery top cover further includes two sealing rings 700 . The sealing rings 700 are sleeved on the outer periphery of the corresponding columns and are located between the top cover body 100 and the lower plastic 600 .

[0049] Furthermore, the sealing ring 700 includes a first portion and a second portion. The first portion is connected to the wall of the mounting hole and the outer peripheral side of the column, and the second portion is in contact with the top cover body 100 and the lower plastic 600 .

[0050] In this embodiment, the battery top cover also includes an upper plastic 800 and a rivet block 900. The upper plastic 800 forms a slot frame, the bottom of which is attached to the top surface of the top cover body 100. The rivet block 900 is inserted and sealed at the slot frame opening. The slot frame bottom and the rivet block 900 both have two connection holes, which correspond to the mounting holes. A column is sequentially inserted through the mounting holes of the top cover body 100, the slot frame connection holes, and the rivet block 900 connection holes, with the top surface of the column flush with the top surface of the rivet block 900.

[0051] It is worth noting that the specific connection method between the outer peripheral side of the pole 500 and the connection hole of the upper plastic 800 and the connection hole of the rivet block 900 can be set according to needs, and the present invention does not make any specific limitation.

[0052] The battery cell provided in this embodiment has high structural strength and good product performance.

[0053] The battery cell comprises a housing, a battery cell, and the aforementioned battery top cover. The battery cell is located within the housing, and the battery top cover is sealed to the housing opening. Because the top cover body 100 of the aforementioned battery top cover is provided with a buffer groove 120 around the periphery of the liquid injection hole 110, the high temperature generated during the welding process between the top cover body 100 and the seal 200 can be transferred to the buffer groove 120 and then accumulated there, preventing the temperature from continuously diffusing to the periphery. This buffers and disperses the welding stress and deformation of the top cover body 100 and the seal 200, and balances the residual stress. As a result, the deformation area of the top cover body 100 and the seal 200 is controlled within the buffer groove 120, thereby improving the structural strength and product performance of the battery top cover.

[0054] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. Battery cover, characterized in that, include: A top cover body (100), wherein a liquid injection hole (110) is provided on the top cover body (100), a buffer groove (120) is provided on the outer circumference of the liquid injection hole (110), and the buffer groove (120) is located on the top end surface of the top cover body (100); A sealing member (200) is provided, wherein the sealing member (200) is sealed in the liquid injection hole (110), the edge of the liquid injection hole (110) on the top surface of the top cover body (100) is welded to the outer peripheral side of the sealing member (200), and the buffer groove (120) is used to buffer the stress generated by the connection between the top cover body (100) and the sealing member (200).

2. The battery top cover according to claim 1, characterized in that: The injection hole (110) comprises a sinking groove (111) and a through hole (112), wherein the through hole (112) is located at the bottom of the sinking groove (111), and the sealing member (200) is annular and matches the shape of the sinking groove (111), and the sealing member (200) is located in the sinking groove (111).

3. The battery top cover according to claim 2, characterized in that: The top end surface of the sealing member (200) is flush with the top end surface of the top cover body (100).

4. The battery top cover according to claim 2, characterized in that: The cross-sectional dimensions of the sealing member (200) gradually decrease from top to bottom.

5. The battery top cover according to claim 3, characterized in that: The buffer groove (120) is an annular groove connected end to end.

6. The battery top cover according to claim 5, characterized in that: The annular groove is a contoured groove, and the shape of the annular groove is the same as the shape of the sinking groove (111).

7. The battery top cover according to claim 6, characterized in that: There are multiple annular grooves, and the multiple annular grooves are concentrically arranged.

8. The battery top cover according to claim 5, characterized in that: The width of the annular groove is in the range of 0.3 mm to 3.0 mm.

9. The battery top cover according to claim 5, characterized in that: The depth of the annular groove ranges from 0.3 mm to 1.0 mm.

10. A battery cell, characterized in that The battery comprises a shell, a battery cell and a battery top cover according to any one of claims 1 to 9, wherein the battery cell is located in the shell, and the battery top cover is sealed at the shell opening.

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