Extremely-simple quasi-circular battery cell cover plate structure and processing technology thereof

Abstract

The invention discloses an extremely-simple quasi-circular battery cell cover plate structure and a processing technology thereof, and particularly relates to the technical field of batteries, the extremely-simple quasi-circular battery cell cover plate structure comprises a cover plate welding assembly, a sealing ring and a top cover sheet which are sequentially arranged from inside to outside, the cover plate welding assembly comprises a cover plate bending assembly, an insulating pad and a pore plate, and the cover plate bending assembly comprises a cover plate, a CID part and an insulating pad. The cover plate is arranged at the top of the CID part, a circle of edge of the outer side of the CID part is bent and flanged towards the direction close to the cover plate, the pore plate is arranged at the bottom of the CID part, the center of the bottom of the CID part is machined into a welding boss close to the pore plate, the welding boss is welded and fixed to the center of the top of the pore plate, the insulation pad is arranged between the CID part and the pore plate, the sealing ring is arranged on the outer side of the CID part, and the top cover piece is arranged on the outer side of the sealing ring. A sandwich structure is formed among the CID piece, the sealing ring and the top cover piece, and a plurality of process bosses are machined in the direction, facing the CID piece, of the sealing ring. According to the invention, the battery cell current overcurrent capability of the battery cell cover plate from inside to outside is ensured, and the safety and reliability of battery cell use are ensured at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly relates to a minimalist circular battery cell cover structure and its processing technology. Background Art

[0002] The battery cell is the electricity storage part in a lithium-ion battery. The working principle of the battery cell is to achieve charging and discharging by the migration of lithium ions between the positive electrode and the negative electrode. The battery cell cover is one of the main components of a lithium battery cell, usually made of materials such as metal and plastic. The function of the battery cell cover is to act as a battery lid and a sealing device, playing the roles of encapsulation, isolation, and protection of the battery cell.

[0003] For the safety and stability of lithium battery cells, there are two layers of protection in the internal design of the battery cells. One is PTC, and the other is CID. The main function of the battery safety CID (Current Interrupt Device current cut-off device) is that when the battery cell fails, a lot of gas will be generated inside the battery. When the air pressure increases to the critical point of the CID function, the designed air pressure flip piece will automatically flip upward under high air pressure, and the compression safety ring welded to the current guiding tab of the battery cell will break and fall off, completely cutting off the battery cell and the current guiding tab, and the battery fails. CID belongs to an irrecoverable protection, also called a self-destruction device, which is the last barrier for the safety protection of the battery cell. When the battery cell is used under abnormal conditions, the function of CID prevents the safety hazard of the battery cell from exploding and catching fire, and it is an indispensable part of the battery cell safety.

[0004] In the past, the CID function often relied on a complex battery cell structure to achieve, and its long-term reliability and cost both had significant disadvantages compared with ordinary structure products. Therefore, the present invention proposes a minimalist circular battery cell cover structure and its processing technology. Summary of the Invention

[0005] The purpose of the present invention is to provide a minimalist circular battery cell cover structure and its processing technology with excellent performance in both technology and economy, ensuring the overcurrent capacity of the battery cell current from the inside to the outside of the battery cell cover, and at the same time ensuring the safety and reliability of the battery cell during use.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A minimalist circular battery cell cover structure, including a cover plate welding assembly, a sealing ring, and a top cover plate arranged in sequence from the inside to the outside. The cover plate welding assembly includes a cover plate bending assembly, an insulating pad, and a hole plate. The cover plate bending assembly includes a cover plate, a CID component, and an insulating pad. The CID component is used to achieve the CID function, and the insulating pad is arranged between the CID component and the hole plate. The insulating pad is used to achieve the insulating function and ensure the safety of the battery cell during use.

[0007] The cover plate is arranged on the top of the CID component. A bending part is formed by bending the outer edge of the CID component in a direction close to the cover plate, and the bending part wraps the edge of the cover plate, so that current over - current conduction is formed between the CID component and the cover plate, ensuring the over - current capacity of the battery cell current from the inside to the outside of the entire battery cell cover plate.

[0008] The orifice plate is arranged at the bottom of the CID component. The center of the bottom of the CID component is processed into a welding boss close to the orifice plate, and the welding boss is fixedly welded to the center of the top of the orifice plate.

[0009] The sealing ring is arranged outside the CID component, and the top cover plate is arranged outside the sealing ring. At the intersection of the sealing ring and the top cover plate with the CID component, they are bent and flanged towards the bending part so that the CID component, the sealing ring and the top cover plate are closely attached to each other to form a sandwich structure. Moreover, a plurality of process bosses are processed on the sealing ring in the direction towards the CID component to ensure the airtightness requirements.

[0010] Further, the bending part is bent and flanged through a bending jig.

[0011] Further, the welding boss of the CID component and the orifice plate are fixed by laser penetration welding.

[0012] Further, the shape of the sealing ring matches the shape of the space between the outer wall of the CID component and the inner wall of the top cover plate, so that the sealing ring is closely attached to the CID component and the top cover plate.

[0013] Further, the shape of the insulating pad matches the shape of the space between the bottom of the CID component and the top edge of the orifice plate, so that the insulating pad is closely attached to the CID component and the orifice plate, and the insulating pad wraps the top edge and the outside of the orifice plate;

[0014] Through the special structural design of the insulating pad and the sealing ring, the insulation requirements between the external shell and the internal structure of the battery cell are met, ensuring the safety of the battery cell during use.

[0015] Further, a plurality of orifice process holes penetrating the orifice plate are opened on the orifice plate. The plurality of orifice process holes are all arranged inside the insulating pad and are used for conducting the internal air pressure of the battery cell to the CID component. When the air pressure increases to the critical point of the CID current function, the air pressure flipping piece will automatically flip upwards under high air pressure, causing the separation between the orifice plate and the CID component and completing the internal current cut - off.

[0016] The present invention also includes a processing technology for the minimalist circular battery cell cover plate structure, and the specific steps are as follows:

[0017] The first step: Place the stamped cover plate and CID component in sequence at the bottom of the bending jig, and then bend and flange the intersection of the CID component and the cover plate so that the two form current over - current conduction. At this time, the cover plate and the CID component form a cover plate bending assembly;

[0018] Step 2: Assemble the cover plate bending assembly, insulating pad, and hole plate in sequence from top to bottom. Weld the welding boss at the bottom of the CID part to the top of the hole plate through laser penetration welding. At this time, the cover plate, CID part, insulating pad, and hole plate form a cover plate welding assembly.

[0019] Step 3: Assemble the cover plate welding assembly, sealing ring, and top cover sheet in sequence from top to bottom. Then bend and turn up the bending part of the sealing ring and the top cover sheet with the top facing the CID part, so as to form a sandwich structure between the CID part, the sealing ring, and the top cover sheet, thereby manufacturing an extremely simple circular battery cell cover plate structure.

[0020] In the above technical solution, the technical effects and advantages provided by the present invention are as follows:

[0021] First, the extremely simple circular battery cell cover plate structure of the present invention has the following advantages:

[0022] 1. Ensure the overcurrent capacity of the battery cell current from the inside to the outside of the entire battery cell cover plate through the CID edge bending process and the laser welding process between the CID boss and the hole plate.

[0023] 2. Through the special structural design of the insulating pad and the sealing ring, the sealing ring closely fits the CID part and the top cover sheet, and the insulating pad closely fits the CID part and the hole plate, meeting the insulation requirements between the external shell and the internal structure of the battery cell and ensuring the safety of the battery cell during use.

[0024] 3. Through the sandwich structure design between the sealing ring, the top cover sheet, and the CID, and the process boss design of the sealing ring in the sandwich structure, control the compression amount of the sealing ring during the assembly process to meet the airtightness requirements of the battery cell cover plate structural parts and ensure the reliability of the battery cell during use.

[0025] Therefore, the extremely simple circular battery cell cover plate structure of the present invention is a product with excellent technical and economic performance.

[0026] Second, the extremely simple circular battery cell cover plate structure of the present invention has the following advantages in the formation of the battery cover plate structure:

[0027] 1. Can optimize the process Cycle Time;

[0028] 2. Increase or decrease the number of components to increase the structural reliability;

[0029] 3. Reduce the product weight of the corresponding structure. Description of the Drawings

[0030] Figure 1 It is an exploded view of the extremely simple circular battery cell cover plate structure of the present invention;

[0031] Figure 2Cross-sectional plan view of the minimalist circular battery cell cover structure of the present invention;

[0032] Figure 3 Partial cross-sectional view of the minimalist circular battery cell cover structure of the present invention;

[0033] Figure 4 Cross-sectional perspective view of the minimalist circular battery cell cover structure of the present invention;

[0034] Figure 5 is Figure 4 Partial structural diagram of;

[0035] Figure 6 Process flow chart for manufacturing the minimalist circular battery cell cover structure of the present invention.

[0036] Explanation of reference numerals:

[0037] 1. Cover plate; 2. Sealing ring; 3. Top cover plate; 4. CID component; 5. Insulating pad; 6. Hole plate; 7. Bending part; 8. Welding boss; 9. Process boss; 10. Process hole of hole plate. Detailed implementation manners

[0038] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0039] The present invention provides a minimalist circular battery cell cover structure as shown in Figures 1-5 , which includes a cover plate 1, a CID component 4, a sealing ring 2, and a top cover plate 3 arranged in sequence from the inside out. A hole plate 6 is provided at the bottom of the CID component 4, and an insulating pad 5 is provided between the CID component 4 and the hole plate 6;

[0040] The cover plate 1, the CID component 4, and the insulating pad 5 form a cover plate bending assembly, and the cover plate bending assembly, the insulating pad 5, and the hole plate 6 form a cover plate welding assembly.

[0041] As shown in Figure 6 , the processing technology of the above-mentioned minimalist circular battery cell cover structure is as follows:

[0042] First step: Place the stamped cover plate 1 and CID component 4 in sequence at the bottom of the bending jig, and then bend and flang the intersection of the CID component 4 and the cover plate 1 so that the two form current conduction, and at this time, the cover plate 1 and the CID component 4 form a cover plate bending assembly;

[0043] Second step: Assemble the cover plate bending assembly, the insulating pad 5, and the hole plate 6 in sequence from top to bottom, and weld the welding boss 8 at the bottom of the CID component 4 to the top of the hole plate 6 by laser penetration welding. At this time, the cover plate 1, the CID component 4, the insulating pad 5, and the hole plate 6 form a cover plate welding assembly;

[0044] Step 3: Assemble the cover plate welding assembly, the sealing ring 2, and the top cover piece 3 in sequence from top to bottom. Then bend and flang the top of the sealing ring 2 and the top cover piece 3 towards the bending part 7 of the CID part 4, so as to form a sandwich structure among the CID part 4, the sealing ring 2, and the top cover piece 3, thereby manufacturing an extremely simple circular battery cell cover plate structure.

[0045] The unique design of the extremely simple circular battery cell cover plate structure of the present invention lies in:

[0046] 1. As Figures 2-4 shown, a bending part 7 is bent and flanged around the outer edge of the CID part 4 towards the direction close to the cover plate 1 through a bending jig, and the bending part 7 wraps the edge of the cover plate 1, so that current overcurrent conduction is formed between the CID part 4 and the cover plate 1; meanwhile, the center of the bottom of the CID part 4 is processed into a welding boss 8 close to the hole plate 6, and the welding boss 8 and the center of the top of the hole plate 6 are fixed by laser penetration welding;

[0047] Through the edge bending process of the CID part 4 and the laser welding process of the boss of the CID part 4 and the hole plate 6, the overcurrent capacity of the battery cell current from the inside to the outside of the entire battery cell cover plate is ensured.

[0048] 2. As Figures 1-4 shown, the present invention designs the outer shape of the sealing ring 2 to be similar to the shape of the space between the outer wall of the CID part 4 and the inner wall of the top cover piece 3, so that the shape of the sealing ring 2 matches the shape of the space between the outer wall of the CID part 4 and the inner wall of the top cover piece 3, so as to make the sealing ring 2 fit tightly with the CID part 4 and the top cover piece 3;

[0049] Meanwhile, the present invention designs the outer shape of the insulating pad 5 to be similar to the shape of the space between the bottom of the CID part 4 and the top edge of the hole plate 6, so that the shape of the insulating pad 5 matches the shape of the space between the bottom of the CID part 4 and the top edge of the hole plate 6, so as to make the insulating pad 5 fit tightly with the CID part 4 and the hole plate 6, and the insulating pad 5 wraps the top edge and the outside of the hole plate 6;

[0050] Through the special structure design of the insulating pad 5 and the sealing ring 2, the insulation requirements between the outer shell and the internal structure of the battery cell are met, and the safety of the battery cell during use is ensured.

[0051] 3. As Figures 1-5 shown, at the intersection of the sealing ring 2 and the top cover piece 3 with the CID part 4, they are all bent and flanged towards the bending part 7 so that the CID part 4, the sealing ring 2, and the top cover piece 3 are closely attached to each other to form a sandwich structure, and a plurality of process bosses 9 are processed on the sealing ring 2 towards the direction of the CID part 4.

[0052] Through the sandwich structure among the sealing ring 2, the top cover sheet 3, and the CID 4, and the design of the process boss 9 of the sealing ring 2 in the sandwich structure, the compression amount of the sealing ring 2 is controlled during the assembly process to meet the airtightness requirements of the cell cover structural part and ensure the reliability of cell use.

[0053] In the present invention, a plurality of orifice process holes 10 penetrating the orifice plate 6 are formed in the orifice plate 6, and the plurality of orifice process holes 10 are all arranged inside the insulating pad 5 and are used for conducting the internal air pressure of the cell to the CID part 4.

[0054] The process of realizing the CID function of the present invention is as follows:

[0055] First, the internal air pressure of the cell is conducted to the CID part 4 through the orifice process holes 10; when the air pressure increases to the critical point of the CID current function, the designed air pressure flip piece will automatically flip upward under high air pressure; then, the flip causes the solder joint between the orifice plate 6 and the CID part 4 to be damaged and separated, thereby completing the internal current cut-off; finally, when the internal air pressure increases to the critical point of the bursting value of the CID part 4, the CID part 4 tears, and the cell completes pressure relief, preventing the safety hazard of the cell from exploding and catching fire and improving the safety of the cell.

[0056] Only some exemplary embodiments of the present invention have been described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, without departing from the spirit and scope of the present invention, the described embodiments can be modified in various different ways. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the protection scope of the claims of the present invention.

Claims

1. A minimalist circular battery cover structure, characterized in that: It comprises a cover plate welding assembly, a sealing ring (2) and a top cover sheet (3) which are arranged in sequence from the inside to the outside, the cover plate welding assembly comprises a cover plate bending assembly, an insulating pad (5) and an orifice plate (6), and the cover plate bending assembly comprises a cover plate (1), a CID component (4) and an insulating pad (5); The cover plate (1) is arranged on the top of the CID component (4), and the outer edge of the CID component (4) is bent and flanged in a direction close to the cover plate (1) to form a bending portion (7), and the bending portion (7) wraps the edge of the cover plate (1), so that current flow conduction is formed between the CID component (4) and the cover plate (1); The orifice plate (6) is arranged at the bottom of the CID component (4), the center of the bottom of the CID component (4) is processed into a welding boss (8) close to the orifice plate (6), and the welding boss (8) is welded and fixed to the center of the top of the orifice plate (6); The insulating pad (5) is arranged between the CID component (4) and the orifice plate (6); The sealing ring (2) is arranged outside the CID component (4), and the top cover sheet (3) is arranged outside the sealing ring (2). The sealing ring (2) and the top cover sheet (3) are both bent and flanged toward the bending portion (7) at the intersection with the CID component (4) so ​​that the CID component (4), the sealing ring (2) and the top cover sheet (3) are closely attached to each other to form a sandwich structure. In addition, the sealing ring (2) is processed with a plurality of process bosses (9) in the direction toward the CID component (4).

2. The extremely simple circular battery cover structure according to claim 1, characterized in that: The bending portion (7) is bent and flanged by a bending jig.

3. The extremely simple circular battery cover structure according to claim 1, characterized in that: The welding boss (8) of the CID component (4) and the orifice plate (6) are fixed by laser penetration welding.

4. The extremely simple circular battery cover structure according to claim 1, characterized in that: The shape of the sealing ring (2) matches the shape of the space between the outer wall of the CID component (4) and the inner wall of the top cover sheet (3), so that the sealing ring (2) fits tightly with the CID component (4) and the top cover sheet (3).

5. The extremely simple circular battery cover structure according to claim 1, characterized in that: The shape of the insulating pad (5) matches the shape of the space between the bottom of the CID component (4) and the top edge of the orifice plate (6), so that the insulating pad (5) fits tightly with the CID component (4) and the orifice plate (6), and the insulating pad (5) wraps the top edge and outer side of the orifice plate (6).

6. The extremely simple circular battery cover structure according to claim 1, characterized in that: The orifice plate (6) is provided with a plurality of orifice plate process holes (10) penetrating the orifice plate (6); the plurality of orifice plate process holes (10) are all arranged on the inner side of the insulating pad (5) and are used for transmitting the internal air pressure of the battery cell to the CID component (4).

7. The processing technology of the extremely simple circular battery cover structure according to any one of claims 1 to 6, characterized in that: The specific steps are as follows: The first step: placing the stamped cover plate (1) and the CID component (4) in order at the bottom of the bending jig, and then bending and flanging the intersection of the CID component (4) and the cover plate (1) so that the two are connected to each other by current flow, and the cover plate (1) and the CID component (4) now form a cover plate bending assembly; Step 2: The cover plate bending assembly, the insulating pad (5), and the orifice plate (6) are assembled from top to bottom in sequence, and the welding boss (8) at the bottom of the CID component (4) is welded to the top of the orifice plate (6) by laser penetration welding. At this time, the cover plate (1), the CID component (4), the insulating pad (5), and the orifice plate (6) form a cover plate welding assembly; Step 3: Assemble the cover plate welding assembly, the sealing ring (2), and the top cover sheet (3) in order from top to bottom, and then bend and turn the top of the sealing ring (2) and the top cover sheet (3) toward the bending portion (7) of the CID component (4), so that a sandwich structure is formed between the CID component (4), the sealing ring (2), and the top cover sheet (3), thereby manufacturing a minimalist circular cell cover plate structure.

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