Battery steel shell end structure and forming tool

Abstract

The utility model relates to the field of batteries, in particular to a battery steel shell end structure and a forming tool, which comprise an inner arc area, an end plane area and an outer chamfer area, the inner arc area is formed on the inner wall of the end of a battery steel shell, and the end plane area is formed on the outer chamfer area. The arc middle area of the inner arc area protrudes away from the shell wall of the battery steel shell so as to guide the connected end plate, and the end plane area is formed on the end face of the battery steel shell so as to lock the height of the battery steel shell in the forming process; the outer chamfer area is formed on the outer wall of the end part of the battery steel shell so as to transfer the position where burrs are formed in the forming process to the middle of the end part of the battery steel shell from the joint of the outer wall and the end part of the battery steel shell. The technical problems that in the prior art, a steel shell end structure of a lithium battery is prone to clamping an end plate, and burrs can enter a shell are solved.

Description

Technical Field

[0001] The utility model relates to the field of batteries, and particularly to an end structure and a forming tooling of a battery steel shell. Background Technique

[0002] The end of the steel shell of a lithium battery is used to connect to an end plate. However, during the connection process, the end structure will jam the end plate. More importantly, during the subsequent assembly process of the steel shell end, burrs at the end will fall into the battery housing, causing internal battery failures. Summary of the Invention

[0003] In order to solve the technical problems in the prior art that the end structure of the steel shell of a lithium battery is prone to jamming the end plate and causing burrs to enter the housing, this application proposes an end structure and a forming tooling of a battery steel shell, which solve the above technical problems.

[0004] The technical solution adopted by the utility model to solve its technical problems is as follows:

[0005] The utility model provides an end structure of a battery steel shell, including: an inner arc area, which is formed on the inner wall of the end of the battery steel shell, and the middle area of the arc of the inner arc area protrudes away from the shell wall of the battery steel shell to guide the inserted end plate; an end plane area, which is formed on the end face of the end of the battery steel shell to lock the height of the battery steel shell during the forming process; an outer chamfer area, which is formed on the outer wall of the end of the battery steel shell to transfer the position where burrs are formed during the forming process from the junction of the outer wall and the end of the battery steel shell to the middle of the end of the battery steel shell.

[0006] Further, the chamfer of the outer chamfer area is a straight chamfer.

[0007] On the other hand, the utility model also provides a forming tooling for manufacturing the above end structure of the battery steel shell, including a folding punch and a folding die. The folding punch includes a conical punch head. The folding die envelopes the straight wall section of the battery steel shell blank with an outward expansion section. The conical punch head is pressed into the battery steel shell blank from the inside to press the outward expansion section of the battery steel shell blank onto the end face of the folding die. The part of the outward expansion section of the battery steel shell blank close to the straight wall section forms the end plane area of the end structure of the battery steel shell and locks the height of the battery steel shell at the place pressed by the conical punch head. At the same time, during the folding process, the changing area from the straight wall section to the end plane area of the battery steel shell blank is bent to form the inner arc area.

[0008] Further, it also includes a profiling punch rod and a profiling female die used for extruding the outer chamfer area after cutting the outer expansion section of the battery steel shell blank. A stamping portion adapted to the shape of the outer chamfer area is formed on the inner side of the stamping end of the profiling punch rod. The profiling female die envelopes the outer periphery of the battery steel shell blank and makes the battery steel shell blank slightly protrude from the end face of the receiving end of the profiling female die.

[0009] Based on the above technical solution, the technical effects that the present utility model can achieve are as follows:

[0010] For the end structure of the battery steel shell provided by the present utility model, the inner arc area can guide the outer periphery of the end plate when the end plate is connected, reducing the jamming resistance and facilitating the connection of the end plate. During the forming process of the end plane area, the height of the battery steel shell is confirmed by stamping the punch surface in the end plane area and the end face of the end of the battery steel shell far from the end structure by pressing from above. The outer chamfer area is formed on the outer wall of the end of the battery steel shell to transfer the position where burrs are formed during the forming process from the junction of the outer wall and the end of the battery steel shell to the middle of the end of the battery steel shell. The burrs at this position will not be touched by other forming tools in the subsequent process. After the inner wall of the battery steel shell is turned over, they can still be completely retained at the end of the battery steel shell without falling into the shell, thereby ensuring the stability of the finished battery without increasing fine machining, reducing the production cycle and lowering the production cost. Description of the Drawings

[0011] Figure 1 is the overall structural schematic diagram of the end structure of the battery steel shell of the present utility model;

[0012] Figure 2 is Figure 1 the partial enlarged view of part A in

[0013] Figure 3 is the schematic diagram of the first case of the burr at the end of the battery steel shell;

[0014] Figure 4 is the schematic diagram of the second case of the burr at the end of the battery steel shell;

[0015] Figure 5 is the schematic diagram of the burr position of the end structure of the battery steel shell of the present utility model;

[0016] Figure 6 is the state of the end structure of the battery steel shell of the present utility model before connecting the end plate;

[0017] Figure 7 is the state of the end structure of the battery steel shell of the present utility model after connecting the end plate;

[0018] Figure 8 is Figure 7 the partial enlarged view of part B in

[0019] Figure 9 This is a schematic diagram of the battery steel shell embryo before the formation of the end structure of the battery steel shell of the present utility model;

[0020] Figure 10 This is a schematic diagram of the folding punch rod and the folding die of the forming tooling of the present utility model;

[0021] Figure 11 is Figure 10 a partial enlarged view of part C in;

[0022] Figure 12 This is a schematic diagram of the profiling punch rod and the profiling die of the forming tooling of the present utility model;

[0023] Figure 13 is Figure 12 a partial enlarged view of part D in.

[0024] In the present utility model:

[0025] 1 - inner arc area; 2 - end plane area; 3 - outer chamfer area; 4 - burr;

[0026] 100 - folding punch rod; 200 - folding die; 300 - profiling punch rod; 400 - profiling die;

[0027] a - battery steel shell embryo, a1 - outward expansion section, a2 - straight wall section;

[0028] b - end plate. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way serves as a limitation to the present utility model and its application or use. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0030] Regarding the burr 4 at the end of the battery steel shell, it is itself an easily overlooked problem. Even if it is discovered, the method of deburring 4 by precision machining is adopted. However, precision machining will lengthen the production cycle and increase the production cost of the product. This application takes a different approach and does not focus on removing the burr 4, but rather changes the position where the burr 4 is generated so that the burr 4 does not affect the subsequent production process. As Figure 3-4 shown, after the production of the inner arc area 1 and the end plane area 2 is completed, the burr 4 at the end of the battery steel shell is formed at the position where the end face of the battery steel shell meets the outer wall, asFigure 6-7 As shown, during the process of the inner turning of the battery steel shell wall after the placement of the end plate b, the burr 4 will be touched and enter the shell, thus affecting the stability of the finished battery.

[0031] As Figure 1-2 Shown in FIGS. 4 and 5, the present invention provides an end structure of a battery steel shell, including an inner arc region 1, an end flat region 2, and an outer chamfer region 3. The inner arc region 1 is formed at the inner wall of the end of the battery steel shell, and the middle region of the arc of the inner arc region 1 protrudes away from the shell wall of the battery steel shell to guide the inserted end plate b. The end flat region 2 is formed on the end face of the end of the battery steel shell to lock the height of the battery steel shell during the forming process. The outer chamfer region 3 is formed on the outer wall of the end of the battery steel shell to transfer the position where the burr 4 is formed during the forming process from the junction of the outer wall and the end of the battery steel shell to the middle of the end of the battery steel shell.

[0032] For the end structure of the battery steel shell provided by the present invention, the inner arc region 1 can guide the outer periphery of the end plate b when the end plate b is inserted, reducing the sticking resistance and facilitating the insertion of the end plate b. During the forming process, the end flat region 2 determines the height of the battery steel shell by stamping the punch surface of the end flat region 2 and the end face of the end of the battery steel shell away from the end structure by pressing from above. As Figure 5-8 Shown in FIG. 6, the outer chamfer region 3 is formed on the outer wall of the end of the battery steel shell to transfer the position where the burr 4 is formed during the forming process from the junction of the outer wall and the end of the battery steel shell to the middle of the end of the battery steel shell. The burr 4 at this position will not be touched by other forming tools during the subsequent process. After the inner turning of the battery steel shell wall, it can still be completely retained at the end of the battery steel shell without falling into the shell, thus ensuring the stability of the finished battery without increasing the finishing process, reducing the production cycle and lowering the production cost.

[0033] In a specific embodiment of the present invention, the chamfer of the outer chamfer region 3 is a straight chamfer.

[0034] As Figure 9-11 Shown in FIG. 7, on the other hand, the present invention also provides a forming tooling for forming the inner arc region 1 and the end flat region 2, including a folding punch 100 and a folding die 200. The folding punch 100 includes a conical punch. The folding die 200 envelopes the straight wall section a2 of the battery steel shell blank a with an outer expansion section a1. The conical punch is pressed into the battery steel shell blank a from the inside to press the outer expansion section a1 of the battery steel shell blank a onto the end face of the folding die 200. The part of the outer expansion section a1 of the battery steel shell blank a close to the straight wall section a2 forms the end flat region 2 of the end structure of the battery steel shell and locks the height of the battery steel shell at the pressed position by the conical punch. At the same time, during the folding process, the changing region from the straight wall section a2 to the end flat region 2 of the battery steel shell blank a is bent to form the inner arc region 1.

[0035] As shown Figure 12-13 As shown, further, the forming tooling of the present utility model further includes a profiling punch rod 300 and a profiling female die 400 for extruding the outer chamfer area 3 after cutting off the outer expansion section a1 of the battery steel shell blank a. A stamping portion adapted to the shape of the outer chamfer area 3 is formed on the inner side of the stamping end of the profiling punch rod 300. The profiling female die 400 envelopes the outer periphery of the battery steel shell blank a, and the battery steel shell blank a slightly protrudes from the receiving end face of the profiling female die 400. During stamping, when the stamping end face of the profiling punch rod 300 contacts the receiving end face of the profiling female die 400, the forming of the outer chamfer area 3 is completed.

[0036] It should be understood that the above-described specific embodiments are only used to explain the present utility model and are not used to limit the present utility model. Obvious changes or variations derived from the spirit of the present utility model are still within the protection scope of the present utility model.

Claims

1. An end structure of a battery steel shell, characterized in that, Comprising: An inner arc region (1) formed at the inner wall of the end of the battery steel shell, and the middle region of the arc of the inner arc region (1) protrudes away from the shell wall of the battery steel shell to guide the inserted end plate (b). An end plane region (2) formed on the end face of the end of the battery steel shell to lock the height of the battery steel shell during the forming process. An outer chamfer region (3) formed on the outer wall of the end of the battery steel shell to transfer the position where the burr (4) is formed during the forming process from the junction of the outer wall and the end of the battery steel shell to the middle of the end of the battery steel shell.

2. The end structure of the battery steel shell according to claim 1, characterized in that The chamfer of the outer chamfer region (3) is a straight chamfer.

3. A forming tooling for manufacturing the end structure of the battery steel shell as described in Claim 1 or 2, characterized in that Comprising a folding punch (100) and a folding die (200), the folding punch (100) includes a conical punch head, the folding die (200) envelopes the straight wall section (a2) of the battery steel shell blank (a) with an outward expansion section (a1), and the conical punch head is pressed into the battery steel shell blank (a) from the inside to press the outward expansion section (a1) of the battery steel shell blank (a) onto the end face of the folding die (200). The part of the outward expansion section (a1) of the battery steel shell blank (a) close to the straight wall section (a2) forms the end plane region (2) of the end structure of the battery steel shell at the pressed position by the conical punch head and locks the height of the battery steel shell. At the same time, during the folding process, the changing region from the straight wall section (a2) to the end plane region (2) of the battery steel shell blank (a) is bent to form the inner arc region (1).

4. The molding tooling according to claim 3, characterized in that, Also including a profiling punch (300) and a profiling die (400) for extruding the outer chamfer region (3) after cutting off the outward expansion section (a1) of the battery steel shell blank (a). The inner side of the stamping end of the profiling punch (300) forms a stamping part whose shape is adapted to the shape of the outer chamfer region (3). The profiling die (400) envelopes the outer periphery of the battery steel shell blank (a), and the battery steel shell blank (a) protrudes slightly from the end face of the receiving end of the profiling die (400).

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