CN115625251A - Novel precise battery top cover plate outer contour punching process - Google Patents

Abstract

The invention discloses a novel outer contour punching process of a precision battery top cover sheet, which belongs to the field of battery production. A novel precision battery top cover sheet outer contour punching process includes the following steps: Step 1: half-shear pier pressure, The strip is placed on the lower template, and the strip is punched through the punch of the upper die. The punching depth is 60% of the overall thickness of the strip, and then the floating plate of the lower mold drives the strip upward to move out of the lower template; Step 2: Saw teeth Forming, the die-cut strip is punched again through the punch of the upper die, the sharp corner of the outer contour of the top cover sheet on the strip contacts the sawtooth chamfer on the lower template, and at the outer contour of the top cover sheet on the strip Form a bevel and complete the forming sawtooth; step 3: fine cutting, reset the punch of the upper die and punch again, punch out the top cover piece after the sawtooth formation from the material belt, and obtain the top cover piece, press through half-shear pier, sawtooth The three-step punching process of forming and fine cutting increases the proportion of the punching bright band of the top cover sheet and reduces burrs; increases the welding quality, reduces the scrap rate and production cost; eliminates the impact of the burr on the outer contour of the top cover sheet on the power The safety hazard caused by the battery greatly improves the safety of end users.

Description

A new precision punching process for the outer contour of the top cover sheet of the battery

technical field

The invention relates to the technical field of battery production, in particular to a novel precision battery top cover sheet outer contour punching process.

Background technique

With the development of the world's industrial economy, the demand for energy is increasing. The depletion of non-renewable energy sources such as coal, oil, and natural gas and the pollution of the environment by fossil energy have brought major challenges to the sustainable development of all mankind. The development of new energy is the only way to solve the depletion of fossil energy and environmental pollution. Power batteries are widely used in automobiles and energy storage equipment, and the development of new energy cannot be separated from the development of power batteries.

The power battery welds the top cover and the shell together by laser welding to play a sealing role; the proportion and quality of the bright band on the outer contour of the top cover sheet play an important role in welding and the safety performance of the battery; high-quality punched surface It can improve welding quality and reduce welding defects such as virtual welding; at the same time, it can reduce burrs to avoid short circuit and fire caused by burrs entering the cell. The punching of the top cover sheet in the prior art results in a low proportion of the outer contour of the top cover sheet. Therefore, , we proposed a new precision die-cutting process for the outer contour of the battery top cover sheet.

Contents of the invention

In order to overcome the above-mentioned technical problems, the object of the present invention is to provide a novel precision battery top cover sheet outer contour punching process, through the three-step punching process of half-shear pier pressing, sawtooth forming and fine cutting, which is different from the prior art top cover Compared with the one-time punching and forming of the sheet, the punching thickness is reduced, thereby increasing the proportion of the punching bright band of the top cover sheet and reducing burrs; increasing the welding quality, reducing the scrap rate and production cost; The burrs on the outer contour of the cover sheet pose a safety hazard to the power battery, which greatly improves the safety of the end user.

The purpose of the present invention can be achieved through the following technical solutions:

A novel precision battery top cover sheet outer contour punching process, comprising the following steps:

Step 1: Half-shear pier pressure, place the strip on the lower formwork, punch the strip through the punch of the upper die, and form a top cover at the bottom of the strip. The punching depth is 60% of the overall thickness of the strip. Then the floating plate of the lower mold drives the material belt to move upwards out of the lower mold;

Step 2: Sawtooth forming, punching again after the punch of the upper die is reset, and punching the punched strip again through the punch of the upper die, when the pressing plate of the upper die is lowered to the dead point, due to the pressing plate of the upper die and the lower There is no gap between the templates, the sharp corners of the outer contour of the top cover sheet on the material belt contact the sawtooth chamfers on the lower template, and a bevel is formed at the outer contour of the top cover sheet on the material belt to complete the forming sawtooth;

Step 3: Fine cutting, punching again after the punch of the upper die is reset, and punching out the sawtooth-shaped top cover sheet from the material belt to obtain the top cover sheet.

As a further solution of the present invention: the unilateral gap between the punch of the upper die and the lower template is 3% of the thickness of the top cover sheet.

As a further solution of the present invention: the material of the upper die punch is SKD11, and the hardness is HRC61°.

As a further solution of the present invention: the lower template is cut 1 to 3 times with precision slow wire.

As a further solution of the present invention: the surface of the lower template is polished by a wool brush with a diameter of 25 μm.

Beneficial effects of the present invention:

In the present invention, through the three-step punching process of half-shear pier pressing, sawtooth forming and fine cutting, compared with the one-time punching forming of the roof sheet in the prior art, the punching thickness is reduced, thereby improving the thickness of the roof sheet. The proportion of the ground punching bright band and the reduction of burrs; increase the welding quality, reduce the scrap rate and production cost; eliminate the safety hazard caused by the burrs on the outer contour of the top cover sheet to the power battery, and greatly improve the safety of end users sex.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings.

Fig. 1 is process diagram of the present invention;

Fig. 2 is a structural schematic diagram of the sawtooth forming process of the roof sheet of the present invention;

Fig. 3 is a structural schematic diagram of the sawtooth precision cutting process of the roof sheet of the present invention;

Fig. 4 is a schematic diagram of the three-dimensional structure of the cover sheet in the present invention;

Fig. 5 is a top view structure diagram of the top cover sheet in the present invention.

Among the figure: 1, upper die seat; 101, upper backing plate; 102, upper die punch; 103, upper splint; 104, stop plate; 105, upper die spring; 106, upper die pressing plate; 2, lower formwork ; 201, the lower mold floating plate; 202, the lower backing plate; 203, the lower mold seat; 204, the stop screw; 205, the lower mold spring;

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

As shown in Figure 1-Figure 5, a new precision battery top cover sheet outer contour punching process includes the following steps:

Step 1: half-cut pier pressure, place the material strip 3 on the lower template 2, start the stamping equipment, the stamping equipment drives the punch 102 of the upper die to move downward, and punch the material strip 3 to a depth of 3 60% of the overall thickness, a top cover sheet 4 is formed at the bottom of the material belt 3, the stamping equipment drives the upper die punch 102 to reset, and then the lower mold floating plate 201 drives the material belt 3 to move upward and out of the lower template 2;

Step 2: sawtooth forming, the stamping equipment drives the punch 102 of the upper die to reset and then punches again, the punched material strip 3 is punched again through the punch 102 of the upper die, and when the pressing plate 106 of the upper die is lowered to the dead point The lower template 2 is attached to each other. At this time, there is zero gap between the upper mold pressing material plate 106 and the lower template 2, and the sharp corners of the outer contour of the top cover sheet 4 on the material belt 3 are in contact with the sawtooth chamfers on the lower template 2. A bevel is formed at the outer contour of the top cover sheet 4 on 3, and forming sawtooth is formed at the outer contour of the top cover sheet 4;

Step 3: Fine cutting, the stamping equipment drives the punch 102 of the upper die to reset and then stamps again, punching out the sawtooth-shaped top cover sheet 4 from the material belt 3, at this time the thickness between the top cover piece 4 and the material belt 3 The remaining difference is 40% of the overall thickness of the top cover sheet 4. By punching the top cover sheet 4 after sawtooth molding without the lower die pressing material, the thinner the punching thickness, the smaller the collapse angle and the more bright bands. Increase the ratio of the bright band to obtain the top cover sheet 4.

As shown in Figure 2 and Figure 3, the unilateral gap between the above-mentioned upper die punch 102 and the lower template 2 is 3% of the thickness of the top cover sheet 4, compared with the punching gap of 8% in the prior art, the closer the gap The shorter the life of the upper die, the larger the proportion of bright bands. The material of the upper die punch 102 is SKD11, and the hardness is HRC61°. At the same time, the surface of the upper die punch 102 is treated with PVD to further improve the life of the punch and the bright band.

In the present invention, the above-mentioned lower template 2 is cut 1 to 3 times with precision slow wire, and the surface of the lower template 2 is polished by a wool brush with a diameter of 25 μm. Through the above-mentioned treatment, a high-precision and low-friction sawtooth chamfer is formed on the lower template 2, Further increased the proportion of bright band.

A novel contour punching process for the top cover sheet of a precision battery, which also includes a punching die for the contour of a novel precision battery top cover sheet. Backing plate 101, upper die punch 102 and upper clamping plate 103 are placed on the bottom of upper backing plate 101, stop plate 104 is arranged on the bottom of upper clamping plate 103, upper die spring 105 is arranged in stop plate 104, and stop plate 104 bottom is provided with There is an upper die pressing plate 106, and the two ends of the upper die spring 105 respectively resist the upper clamping plate 103 and the upper die pressing plate 106, the upper die punch 102 runs through the upper die pressing plate 103, the stop plate 104 and the upper die pressing plate 106, and the lower die The top of the seat 203 is provided with a lower backing plate 202, the lower backing plate 202 is provided with a lower formwork 2, the middle of the lower formwork 2 is slidably connected with a lower mold floating plate 201, and the middle of the lower mold base 203 is threadedly connected with a stop screw 204. The screw 204 is provided with a lower mold spring 205 , and the end of the lower mold spring 205 away from the set screw 204 is offset against the lower mold floating plate 201 . The positions of the upper die punch 102 and the rest of the lower die floating material plate 201 are vertically collinear.

An embodiment of the present invention has been described in detail above, but the content described is only a preferred embodiment of the present invention, and cannot be considered as limiting the implementation scope of the present invention. All equivalent changes and improvements made according to the application scope of the present invention shall still belong to the scope covered by the patent of the present invention.

Claims (5)

1. The novel precise battery top cover plate outer contour punching process is characterized by comprising the following steps of:

the method comprises the following steps: semi-shearing and upsetting, namely placing the material belt (3) on a lower template (2), punching the material belt (3) through an upper die punch (102), forming a top cover plate (4) at the bottom of the material belt (3), wherein the punching depth is 60% of the whole thickness of the material belt (3), and then driving the material belt (3) to move out of the lower template (2) upwards through a lower die floating plate (201);

step two: the method comprises the steps that sawtooth forming is conducted, an upper die punch (102) is reset and then punched again, the punched material belt (3) is punched again through the upper die punch (102), when an upper die pressure plate (106) goes down to a dead point, due to the fact that a zero gap exists between the upper die pressure plate (106) and a lower die plate (2), the sharp corner of the outer contour of an upper top cover plate (4) of the material belt (3) is in contact with the sawtooth chamfer angle on the lower die plate (2), an oblique angle is formed at the outer contour of the top cover plate (4) on the material belt (3), and sawtooth forming is completed;

step three: and (3) fine cutting, resetting the upper die punch head (102) and then punching again, and punching the top cover plate (4) with the formed sawteeth from the material belt (3) to obtain the top cover plate (4).

2. The novel precise battery top cover plate outer contour punching process is characterized in that the unilateral clearance between the upper die punch head (102) and the lower die plate (2) is 3% of the thickness of the top cover plate (4).

3. The novel precise battery top cover outer contour punching process according to claim 1, wherein the upper die punch (102) is made of SKD11 and has a hardness of HRC61 degrees.

4. The novel precise battery top cover plate outer contour punching process is characterized in that the lower template (2) is cut by precise slow wire for 1-3 times.

5. The novel precise battery top cover plate outer contour punching process is characterized in that the surface of the lower template (2) is polished by a wool brush with the diameter of 25 mu m.

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