Connection structure of lithium battery pole and steel shell

Abstract

The utility model belongs to the technical field of lithium battery manufacturing, and particularly relates to a connecting structure of a lithium battery pole and a steel shell, a steel cover is arranged at one end of the steel shell, a liquid injection hole is formed in the steel cover, the part, at the liquid injection hole, of the steel cover is folded towards the interior of the steel shell to form a connecting ring, an elastic sealing piece is arranged on the outer end face of the steel cover, and the elastic sealing piece is connected with the steel cover. The polar column comprises a column body and a disc body arranged at one end of the column body, the column body is inserted into the steel shell through the liquid injection hole and enables the disc body to be pressed on the elastic sealing piece, the part, inserted into the steel shell, of the column body is provided with a positioning pin extending in the radial direction, and correspondingly, the positioning pin extends in the radial direction. The steel cover is provided with a receding groove for the positioning pin to pass through at the liquid injection hole, and a positioning groove matched with the positioning pin is formed in the ring face, stretching into the steel shell, of the connecting ring. The technical problem that in the prior art, after a lithium battery formation test, a pole and a steel shell are not easy to disassemble is solved.

Description

Technical Field

[0001] This utility model belongs to the field of lithium battery manufacturing technology, and in particular relates to a connection structure between lithium battery terminals and steel shell. Background Technology

[0002] After the lithium battery is assembled, a formation test is required, which involves venting the gas inside the casing after the first charge and discharge cycle. Therefore, it is necessary to propose a connection structure between the terminals and the steel casing that facilitates easy disassembly. Summary of the Invention

[0003] To address the technical problem of difficulty in disassembling the terminals and steel shell after lithium battery formation testing in existing technologies, this application proposes a connection structure for lithium battery terminals and steel shell, which solves the aforementioned technical problem.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] This utility model provides a connection structure for a lithium battery terminal and a steel shell. One end of the steel shell is fitted with a steel cap, which has an injection hole. A portion of the steel cap at the injection hole folds inwards to form a connecting ring. An elastic sealing element is provided on the outer end face of the steel cap. The terminal includes a column and a disc at one end of the column. The column is inserted into the steel shell through the injection hole, and the disc is pressed against the elastic sealing element. A radially extending locating pin is provided on the portion of the column inserted into the steel shell. Correspondingly, a clearance groove is provided at the injection hole for the locating pin to pass through, and the connecting ring extending into the steel shell forms a locating groove that mates with the locating pin. Under external force, after the column of the terminal is inserted into the steel shell, the disc compresses the elastic sealing element to a compressed state. Rotating the terminal causes the locating pin to rotate to face the locating groove. Releasing the external force, the terminal, under the action of the elastic sealing element, allows the locating pin to engage with the locating groove, completing the connection.

[0006] Furthermore, an inclined guide section is formed on the ring surface portion of the connecting ring that extends into the steel shell. The inclined guide section extends from one side of the relief groove to one side of the positioning groove, and the portion of the inclined guide section that is closer to the positioning groove extends further into the shell.

[0007] Furthermore, both ends of the locating pin protrude radially from the outer wall surface of the column.

[0008] Furthermore, the outer edge of the elastic seal is folded away from the steel cover to form a flange, which encloses the outer periphery of the disc body.

[0009] Furthermore, a slot is provided on the outer end face of the disc.

[0010] Based on the above technical solution, the technical effects that this utility model can achieve are as follows:

[0011] The connection structure between the lithium battery terminal and the steel shell of this utility model completes the assembly connection of the terminal and the steel shell through the cooperation of the positioning pin on the terminal and the positioning groove on the steel shell. Specifically, the terminal is inserted into the steel shell. During the insertion process, the positioning pin enters the steel shell through the clearance groove. As the terminal continues to enter the steel shell, the disc at one end of the terminal presses against the elastic seal, causing the elastic seal to be in a compressed state. At this time, the positioning pin on the terminal is already a little distance away from the ring surface of the connecting ring that extends into the steel shell to avoid interference with the positioning pin. The terminal is rotated so that the positioning pin on the terminal is aligned with the positioning groove. At this time, the external force is released, and the compressed elastic seal... The seal is reset, pushing the positioning pin toward the inner end face of the steel cover, so that the positioning pin enters the positioning groove to complete the assembly connection, and the lithium battery formation test is performed. After the test, the operation is reversed to disconnect the connection between the terminal and the steel shell. During the process, the compression of the elastic sealing ring can be controlled by the depth of the positioning groove on the steel shell, reducing the requirements for assembly equipment. In summary, this utility model provides a connection structure for lithium battery terminals and steel shell that is easy to disassemble and assemble, which facilitates venting or replenishing of electrolyte after the initial charge and discharge formation of the lithium battery, and solves the technical problem that the terminals and steel shell are not easy to disassemble after the lithium battery formation test in the prior art. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of the connection between the lithium battery terminal and the steel shell of this utility model.

[0013] Figure 2 This is a schematic diagram from another perspective of the connection structure between the lithium battery terminal and the steel shell of this utility model.

[0014] Figure 3 This is a cross-sectional schematic diagram of the lithium battery terminal and steel shell of this utility model;

[0015] Figure 4 This is a schematic diagram of the lithium battery terminal and the steel cover of the steel shell of this utility model.

[0016] Among them: 1-steel cover, 11-injection hole, 12-connecting ring, 13-gap groove, 14-positioning groove, 15-inclined guide section; 2-elastic seal, 21-flanged edge; 3-column, 31-positioning pin; 4-disc, 41-slot. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0018] like Figure 1-4 As shown, this utility model provides a connection structure for a lithium battery terminal and a steel shell. The steel shell has a steel cap 1 at one end, with an injection hole 11 on the cap 1. The portion of the cap 1 at the injection hole 11 is folded inwards to form a connecting ring 12. An elastic sealing element 2 is provided on the outer end face of the cap 1. The terminal includes a column 3 and a disc 4 disposed at one end of the column 3. The column 3 is inserted into the steel shell through the injection hole 11, and the disc 4 is pressed against the elastic sealing element 2. A radial extension is provided on the portion of the column 3 inserted into the steel shell. The locating pin 31 extends outward. Correspondingly, the steel cover 1 has a relief groove 13 at the injection hole 11 for the locating pin 31 to pass through, and the connecting ring 12 extends into the ring surface inside the steel shell to form a locating groove 14 that mates with the locating pin 31. Under the action of external force, the column body 3 of the pole is inserted into the steel shell and the elastic seal 2 is pressed into a compressed state by the disc body 4. The pole is rotated to make the locating pin 31 rotate to face the locating groove 14. The external force is released, and the pole, under the action of the elastic seal 2, makes the locating pin 31 engage with the locating groove 14 to complete the connection.

[0019] In a preferred embodiment of this invention, an inclined guide section 15 is formed on the ring surface portion of the connecting ring 12 that extends into the steel shell. The inclined guide section 15 extends from one edge of the relief groove 13 to one edge of the positioning groove 14, and the portion of the inclined guide section 15 that is closer to the positioning groove 14 extends further into the shell. This reduces the contact between the terminal post and the steel shell during assembly, thereby reducing minor deformation of the steel shell and ensuring accurate and unbiased positioning of each component in subsequent assembly of the lithium battery.

[0020] In one specific embodiment of this utility model, both ends of the positioning pin 31 protrude radially from the outer wall surface of the column 3.

[0021] In one specific embodiment of this utility model, the outer edge of the elastic seal 2 is folded away from the steel cover 1 to form a flange 21, which encloses the outer periphery of the disc body 4, thereby facilitating automated mechanical operation.

[0022] In one specific embodiment of this utility model, a slot 41 is provided on the outer end face of the disk body 4 to facilitate the subsequent assembly of the lithium battery.

[0023] It should be understood that the specific embodiments described above are only for explaining the present invention and are not intended to limit the present invention. Obvious variations or modifications derived from the spirit of the present invention are still within the protection scope of the present invention.

Claims

1. A connection structure between a lithium battery terminal and a steel shell, characterized in that, A steel cap (1) is provided at one end of the steel shell. An injection hole (11) is provided on the steel cap (1). The part of the steel cap (1) at the injection hole (11) is folded into the steel shell to form a connecting ring (12). An elastic sealing element (2) is provided on the outer end face of the steel cap (1). The pole includes a column (3) and a disc (4) provided at one end of the column (3). The column (3) is inserted into the steel shell through the injection hole (11) and the disc (4) is pressed onto the elastic sealing element (2). A radially extending positioning pin (31) is provided on the part of the column (3) inserted into the steel shell. Correspondingly, the steel cap (1) has a relief groove (13) at the injection hole (11) for the positioning pin (31) to pass through. The connecting ring (12) extends into the ring surface of the steel shell and forms a positioning groove (14) that cooperates with the positioning pin (31). Under the action of external force, the column (3) of the pole is inserted into the steel shell and the elastic seal (2) is pressed into a compressed state by the disc (4). The pole is rotated so that the positioning pin (31) is rotated to face the positioning groove (14). The external force is released and the pole, under the action of the elastic seal (2), makes the positioning pin (31) fit into the positioning groove (14) to complete the connection.

2. The connection structure between the lithium battery terminal and the steel shell according to claim 1, characterized in that, The connecting ring (12) has an inclined guide section (15) formed on the ring surface portion that extends into the steel shell. The inclined guide section (15) extends from one side of the relief groove (13) to one side of the positioning groove (14), and the portion of the inclined guide section (15) that is closer to the positioning groove (14) extends further into the shell.

3. The connection structure between the lithium battery terminal and the steel shell according to claim 1, characterized in that, Both ends of the positioning pin (31) protrude radially from the outer wall surface of the column (3).

4. The connection structure between the lithium battery terminal and the steel shell according to claim 1, characterized in that, The outer edge of the elastic seal (2) is folded away from the steel cover (1) to form a flange (21), which encloses the outer periphery of the disc body (4).

5. The connection structure between the lithium battery terminal and the steel shell according to claim 1, characterized in that, The disc body (4) has a slot (41) on one end face facing outward.

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