CN110712359B - Battery shell, forming method thereof and stamping device - Google Patents

Abstract

The present disclosure relates to battery technology, and particularly to a battery case, a method for forming the battery case, and a stamping device for forming the battery case. The shell is formed by a diaphragm to be processed through sectional punching, and is provided with a preset processing area which is sequentially defined as a peripheral blank pressing area, a middle pressing area and a punching contact area from outside to inside; the sectional type punching pit comprises a first section of punching pit and a second section of punching pit, wherein the first section of punching pit is used for compacting the peripheral edge pressing area, and the punching contact area is punched to form a groove with a first preset depth; and the second section of punching pit is used for continuously punching the punching contact area and gradually compacting the middle compacting area to form a target groove. Four bight thickness of casing that obtain through the multistage towards hole of this application are thicker to can avoid towards the fish scale pattern that the hole in-process produced, fold scheduling problem, make the shells inner wall after the shaping level and smooth.

Description

Battery case, forming method and stamping device thereof

Technical field

The present application relates to the field of batteries, and in particular to a battery case and a forming method thereof, and a stamping device for forming the battery case.

Background technique

With the rapid development of electric vehicles, the requirements for the energy density of lithium-ion batteries are getting higher and higher. This has prompted the development of lithium-ion power batteries in the direction of high volume, high quality and density. As the core material of soft-pack batteries, aluminum-plastic film plays a vital role in battery performance. Aluminum-plastic films generally adopt the method of punching and forming. With the development trend of lithium-ion battery technology, the requirements for the quality of punching aluminum-plastic films are getting higher and higher. Not only does it require a larger punching depth, but also requires a punching process. The damage to the aluminum-plastic film should be very small.

At present, aluminum-plastic film punching is mainly achieved by using a punching machine to drive the punching mold movement. First, the aluminum-plastic film is fixed by a pressing mechanism, and then the convex and concave molds are used to cooperate with the punching and forming process, so that the surroundings of the aluminum-plastic film are extended to form a pit-shaped structure with a certain depth. During the punching and forming process, the pressing mechanism The positioned part cannot participate in the deformation of the molding. Only the part in contact with the die punch part extends and forms. The thickness of the formed part is uneven and it is easy to break. The punching depth of aluminum-plastic film and the thickness of the aluminum layer at the corners of the punched pit are called bottlenecks that limit the use of aluminum-plastic film.

Contents of the invention

This application aims to solve the technical problems of the existing aluminum-plastic film punching depth and the low thickness of the aluminum layer at the corners of the punching pit.

In order to solve the above technical problems, in the first aspect, the present application discloses a battery case. The case is formed by segmented punching from a diaphragm to be processed. The case has at least one target groove, each of which has at least one target groove. Each of the target grooves corresponds to a preset processing area of the diaphragm to be processed, and the preset processing area is defined from outside to inside as a peripheral edge pressing area, a middle pressing area and a stamping contact area;

The segmented punching pit includes a first punching pit and a second punching pit, wherein the first punching pit is to compress the peripheral edge blanking area and punch the punching contact area to form a first punching pit. A groove with a preset depth; the second punching pit is to continue punching the punching contact area, and at the same time gradually compress the intermediate pressing area to form the target groove.

Furthermore, the membrane to be processed has a preset temperature before the segmented punching.

Further, the preset temperature is 30°C-60°C.

Further, the first preset depth is 0.25-0.35 times of the target groove depth.

Further, the target groove is a circular groove or a polygonal groove, and the bottom edge of the target groove has rounded corners.

In a second aspect, the present application discloses a battery case. The case is formed by segmented punching from a diaphragm to be processed. The case has at least one target groove, each of the target grooves. Each corresponds to a preset processing area of the diaphragm to be processed, and the preset processing area is defined from outside to inside as a peripheral edge pressing area, a middle pressing area and a stamping contact area;

The segmented punching pit includes a first-stage punching pit, a second-stage punching pit and a third-stage punching pit, wherein the first-stage punching pit is for pressing the peripheral edge pressing area and punching the punching contact area to form a groove with a first preset depth; the second-stage punching pit is for continuing to punch the punching contact area and gradually pressing the middle pressing area to form a groove of a second preset depth; the third-stage punching pit is for continuing to punch the punching contact area to form the target groove.

Further, the diaphragm to be processed has a preset temperature before undergoing the segmented punching.

Further, the preset temperature is 30°C-60°C.

Further, the first preset depth is 0.25-0.35 times the target groove depth; and/or the second preset depth is 0.9-0.95 times the target groove depth.

Furthermore, the target groove is a circular groove or a polygonal groove, and the bottom edge of the target groove has a rounded corner.

In a third aspect, this application discloses a battery case forming method, including:

The diaphragm to be processed is punched in the first stage, wherein the diaphragm to be processed has a preset processing area, and the preset processing area is defined from outside to inside as a peripheral edge pressing area, a middle pressing area and a stamping contact area. , the first punching pit is to press the peripheral edge area, and punch the punching contact area to form a groove with a first preset depth;

A second stage of punching is performed on the diaphragm to be processed. The second stage of punching is to continue punching the punching contact area and gradually compress the intermediate pressing area to form a groove or target groove with a second preset depth.

Furthermore, when the second stage of punching is to form a groove having the second preset depth, the forming method further comprises: performing a third stage of punching on the membrane to be processed, wherein the third stage of punching is to continue punching the punching contact area to form a target groove.

Further, the first preset depth is 0.25-0.35 times of the target groove depth.

Further, the target groove is a circular groove or a polygonal groove, and the bottom edge of the target groove has rounded corners.

Further, before performing the first stage of punching the diaphragm to be processed, the step further includes: passing the diaphragm to be processed through a temperature adjustment device to reach a preset temperature.

Furthermore, the heating method adopted by the temperature adjustment device is radiation heating or contact heating.

Further, the preset temperature is 30°C-60°C.

Furthermore, the heating method adopted by the temperature adjustment device is radiant heating, and the distance between the diaphragm to be processed and the temperature adjustment device is 50mm-200mm.

In a fourth aspect, the present application discloses a punching device for forming a battery housing, comprising:

Punching punch;

A concave template, the concave template is provided with a depression, the outline of the depression is a regular shape or an irregular shape, and the depression matches the punching punch;

A first compression template, the first compression template is arranged on the upper part of the concave template and is used to compress the peripheral edge pressing area of the diaphragm to be processed;

The second pressing template is arranged on the upper part of the first pressing template and is used to compress the middle pressing area of the diaphragm to be processed.

Further, the stamping device further includes a driving motor, the second pressing template is connected to the driving motor, and the driving motor is used to drive the lifting and lowering of the second pressing template.

Adopting the above technical solution, the battery case, its forming method, and the stamping device for forming the battery case described in this application have the following beneficial effects:

The battery case described in the embodiment of the present application is formed through multi-stage punching. In the first stage of punching, only the peripheral edge pressing area is pressed. The middle pressing area and the punching contact area are unpressed areas. At this time, there is no pressing. The area of the tight part is large, and the thickness of the punched pit part fully shares the tension with the un-pressed part, so that the thickness of the un-pressed part and the four corners of the punched pit is even. The second stage of the punching process will gradually compress the middle compression area. After the punching is completed, the overall thickness of the shell is not much different. Compared with the previous molding method, the thickness of the four corners of the punching hole is thicker, and the punching process can be well avoided. The fish scales, wrinkles and other problems caused by the molding are eliminated to make the inner wall of the molded shell smooth and smooth.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without exerting creative efforts.

FIG1 is a schematic diagram of a battery housing molding according to an embodiment of the present application;

Figure 2 is a schematic diagram of the battery case molding according to one embodiment of the present application;

FIG3 is a schematic diagram of a battery housing punching process according to an embodiment of the present application;

FIG4 is a schematic diagram of a battery housing punching process according to an embodiment of the present application;

Figure 5 is a schematic diagram of heating the film to be processed according to an embodiment of the present application;

Figure 6 is a schematic structural diagram of a stamping device according to another embodiment of the present application.

The following is a supplementary explanation of the accompanying drawings:

11-punch punch; 12-concave template; 13-first pressing template; 14-second pressing template; 15-driving motor; 20-temperature adjustment device; 30-diaphragm to be processed.

Detailed ways

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

In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", etc. are based on the orientation or positional relationship shown in the drawings and are only for the purpose of To facilitate the description of the present application and to simplify the description, it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present application. In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as “first” and “second” may explicitly or implicitly include one or more of these features. Furthermore, the terms "first", "second", etc. are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances so that the embodiments of the application described herein can be practiced in sequences other than those illustrated or described herein.

In order to solve the problem of uneven thickness of existing aluminum-plastic film punching and pit forming, the aluminum layer at the corners after forming is thin and easily broken. This application discloses a battery case. As shown in Figure 1, the case is formed by segmented punching of a diaphragm 30 to be processed. The case has at least one target groove, and each target groove corresponds to the target groove to be processed. The preset processing area for processing the diaphragm 30 is defined from the outside to the inside as the peripheral edge pressing area, the middle pressing area and the punching contact area; the segmented punching pit includes the first punching pit and the second punching zone. The first section of the punching pit is to press the peripheral edge area and punch the above-mentioned stamping contact area to form a groove with a first preset depth; the second section of the punching pit is to continue to punch the above-mentioned stamping contact area, and at the same time gradually Press the middle pressing area to form the target groove.

The battery case described in the embodiment of this application is formed through two stages of punching. During the first stage of punching, only the peripheral edge pressing area is pressed, and the middle pressing area and the stamping contact area are unpressed areas. At this time, The area of the uncompressed part is large, and the thickness of the punched pit part fully shares the tension with the uncompressed part, so that the thickness of the uncompressed part and the four corners of the punched pit is even. The second stage of pit punching will gradually compress the middle compression area until the second stage of pit punching is completed. Optionally, during the process of compressing the intermediate compression area, the pressure changes linearly with the depth of the punching pit, or it can also change nonlinearly. In some embodiments, the method of compressing the middle pressing area may also be to gradually compress the middle pressing area inwardly from the peripheral edge pressing area. Since the middle compression area is gradually compressed during the second stage of punching, there is not much difference in the overall thickness after the punching is completed. Compared with the previous forming method, the thickness of the four corners of the punching hole is thicker, and the punching can be well avoided. The fish scales, wrinkles and other problems generated during the process make the inner wall of the molded shell smooth and smooth. Optional, the battery shell is made of aluminum plastic film, high-strength steel, magnesium alloy, aluminum alloy, high-performance plastic or carbon fiber composite materials, etc.

In the embodiment of the present application, the diaphragm 30 to be processed has a preset temperature before being punched in a segmented manner.

Specifically, the plasticity of the diaphragm 30 to be processed can be improved by preheating before punching and molding, so that the punching and molding effect is better, and the battery case after punching and molding will not have internal stress that causes the case to deform. , the shell quality is higher.

In a possible implementation, the preset temperature is 30°C-60°C. Preferably, the above-mentioned preset temperature may be 45°C.

In the embodiment of the present application, the preheating temperature of the diaphragm 30 to be processed can be selected and determined based on factors such as the material of the diaphragm 30 to be processed.

In a possible implementation, the first preset depth is 0.25-0.35 times the target groove depth. For example, the first preset depth is 0.3 times the target groove depth.

In the embodiment of the present application, the process of punching the pit is a continuous and uninterrupted process. During the process of punching the pit, the pressing pressure on the edge changes in stages according to the depth of the pit. Optionally, when the punching depth is 0.25-0.35 times the target depth, select constant pressure to compress the peripheral edge area, and then select variable pressure to gradually compress the middle compression area while performing the second stage of punching.

In a possible implementation, the target groove is a circular groove or a polygonal groove, and the bottom edge of the target groove has rounded corners. For example, the target groove is a square groove.

In the embodiment of the present application, the shape of the target groove can be determined according to the actual use requirements of the battery case. Optionally, the target groove can be a circular groove, or it can also be a regular polygonal groove or a special-shaped groove. Preferably, regardless of the shape of the groove, the edges at the bottom are rounded. The rounded corners can ensure the thickness of the edges and at the same time disperse stress, making the shell molding quality better.

As shown in Figure 2, this application discloses a battery case. The case is formed by segmented punching of a diaphragm 30 to be processed. The case has at least one target groove, and each target groove corresponds to the target groove to be processed. The preset processing area for processing the diaphragm 30 is defined from the outside to the inside as the peripheral edge pressing area, the middle pressing area and the stamping contact area; the segmented punching pit includes the first punching pit, the second punching pit The first punching pit is to press the peripheral edge area and punch the above-mentioned punching contact area to form a groove with a first preset depth; the second punching pit is to continue punching the above-mentioned punching contact area, and at the same time gradually compress the middle pressing area to form a groove with a second preset depth; the third punching pit is to continue punching the above-mentioned punching contact area to form a target groove.

The battery case described in the embodiment of this application is formed through three stages of punching. During the first stage of punching, only the peripheral edge pressing area is pressed, and the middle pressing area and the stamping contact area are unpressed areas. At this time The area of the uncompressed part is large, and the thickness of the punched pit part fully shares the tension with the uncompressed part, so that the thickness of the uncompressed part and the four corners of the punched pit is even. The second stage of pit punching will gradually compress the middle compression area until the second stage of pit punching is completed. Optionally, during the process of compressing the intermediate compression area, the pressure changes linearly with the depth of the punching pit, or it can also change nonlinearly. In some embodiments, the method of compressing the middle pressing area may also be to gradually compress the middle pressing area inwardly from the peripheral edge pressing area. The third stage of punching is to further trim the stamped shell and improve the molding quality while pressing the outer edge pressing area and the middle pressing area. Since the middle compression area is gradually compressed during the second stage of punching, there is not much difference in the overall thickness after the punching is completed. Compared with the previous forming method, the thickness of the four corners of the punching hole is thicker, and the punching can be well avoided. The fish scales, wrinkles and other problems generated during the process make the inner wall of the molded shell smooth and smooth. Optional, the battery shell is made of aluminum plastic film, high-strength steel, magnesium alloy, aluminum alloy, high-performance plastic or carbon fiber composite materials, etc.

In the embodiment of the present application, the diaphragm 30 to be processed has a preset temperature before being punched in a segmented manner.

Specifically, the plasticity of the diaphragm 30 to be processed can be improved by preheating before punching and molding, so that the punching and molding effect is better, and the battery case after punching and molding will not have internal stress that causes the case to deform. , the shell quality is higher.

In a possible embodiment, the preset temperature is 30°C-60°C. Preferably, the above-mentioned preset temperature may be 45°C.

In the embodiment of the present application, the preheating temperature of the diaphragm 30 to be processed can be selected and determined based on factors such as the material of the diaphragm 30 to be processed.

In a possible embodiment, the first preset depth is 0.25-0.35 times the target groove depth. For example, the first preset depth may be 0.3 times the target groove depth.

In a possible embodiment, the second preset depth is 0.9-0.95 times the target groove depth. For example, the second preset depth is 0.93 times the target groove depth.

In the embodiment of the present application, the process of punching the pit is a continuous and uninterrupted process. During the process of punching the pit, the pressing pressure on the edge changes in stages according to the depth of the pit. Optionally, when the punching depth is 0.25-0.35 times the target depth, select constant pressure to compress the peripheral edge area, and then select variable pressure to gradually compress the middle compression area while performing the second stage of punching. At the end of the second stage of punching, both the peripheral edge pressing area and the middle pressing area are compressed. At this time, the pressure no longer changes, and the third stage of punching is carried out to trim the molded shell. Optional, when the second stage of pit punching is completed, the pit punching depth reaches 0.9-0.95 times the target depth.

In a possible embodiment, the target groove is a circular groove or a polygonal groove, and the bottom edge of the target groove has rounded corners. For example, the target groove is a square groove.

In the embodiment of the present application, the shape of the target groove can be determined according to the actual use requirements of the battery case. Optionally, the target groove can be a circular groove, or it can also be a regular polygonal groove or a special-shaped groove. Preferably, regardless of the shape of the groove, the edges at the bottom are rounded. The rounded corners can ensure the thickness of the edges and at the same time disperse stress, making the shell molding quality better.

As shown in Figures 3 and 4, and in combination with Figures 1 and 2, the present application discloses a battery shell forming method, including: performing a first stage of punching a diaphragm 30 to be processed, wherein the diaphragm to be processed has a preset processing area, and the preset processing areas are defined as a peripheral edge pressing area, an intermediate pressing area and a stamping contact area from the outside to the inside, and the first stage of punching is to press the peripheral edge pressing area, and to punch the above-mentioned stamping contact area to form a groove with a first preset depth; performing a second stage of punching a diaphragm 30 to be processed, and the second stage of punching is to continue punching the above-mentioned stamping contact area, and gradually press the intermediate pressing area to form a groove with a second preset depth or directly form a target groove.

In the embodiment of the present application, the diaphragm 30 to be processed is formed into a battery case by punching, and the punching process is divided into multiple stages. The diaphragm 30 to be processed is pre-processed and then punched. The pre-processing includes designing the size and shape of the diaphragm, etc., and then the first stage of punching is carried out. The processing area of the diaphragm is the peripheral edge pressing area, the middle pressing area and the stamping contact area from the outside to the inside. During the first stage of pit punching, the peripheral edge pressing area is first pressed and the first stage of pit punching is carried out. After the first stage of punching reaches the preset depth, the second stage of punching begins. At this time, the middle compression area begins to be gradually compressed. Optionally, during the process of compressing the middle compression area, the pressure increases with the depth of the punching hole. Linear changes can also be non-linear changes. In some embodiments, the method of compressing the middle pressing area may also be to gradually compress the middle pressing area inwardly from the peripheral edge pressing area. In the second stage of the pit punching process, the target punching depth can be directly reached to obtain the battery case. In some embodiments, the casing that has been punched in the second stage can be further trimmed to make the quality of the formed battery casing more stable.

When the second punching step is to form a groove having the second preset depth, the forming method further comprises: performing a third punching step on the diaphragm 30 to be processed, wherein the third punching step is to continue punching the above-mentioned punching contact area to form a target groove.

In the embodiment of the present application, after the second stage of punching is completed, both the peripheral pressing area and the middle pressing area are pressed. At this time, the third stage of punching can also be carried out to trim the molded shell.

In a possible embodiment, the first preset depth is 0.25-0.35 times the target groove depth. For example, the first preset depth is 0.3 times the target groove depth.

In the embodiment of the present application, during the first stage of pit punching, only the peripheral compaction area is compacted. At this time, the target depth of 0.25 to 0.35 of the pit punch can be completed, and then the middle compaction area starts to be compacted, while the second Duan Chongkeng. The second stage of punching can directly reach the target punching depth. In some embodiments, when the second stage of punching is completed, the depth of the hole reaches 0.9 to 0.95 of the target depth, and then the third stage of punching is performed to trim the entire molded shell to ensure the molding quality.

In a possible implementation, the target groove may be a circular groove or a polygonal groove, and the bottom edge of the target groove has a rounded corner. For example, the target groove is a square groove.

In the embodiment of the present application, the shape of the target groove can be determined according to the actual use requirements of the battery case. Optionally, the target groove can be a circular groove, or it can also be a regular polygonal groove or a special-shaped groove. The bottom edge of the slot has rounded corners. The groove shape of the punching pit and the rounded corners at the bottom can be obtained during the punching process by designing the shape of the punching punch 11, eliminating the need for subsequent processing, thereby reducing process costs.

In a possible implementation, before the first stage of punching the diaphragm 30 to be processed, the process further includes: passing the diaphragm 30 to be processed through the temperature adjustment device 20 to reach a preset temperature.

In the embodiment of the present application, before punching the diaphragm 30 to be processed, there is a preheating process for the diaphragm. Preheating the diaphragm 30 to be processed can improve the plasticity of the diaphragm 30 to be processed, resulting in better molding quality.

In a possible implementation, the heating method adopted by the temperature adjustment device 20 is radiation heating or contact heating.

In the embodiment of the present application, the heating method of the temperature regulating device 20 for the diaphragm 30 to be processed can be selected as radiant heating or contact heating. Radiant heating can make the diaphragm 30 to be processed more evenly heated, and contact heating can improve heat transfer. Efficiency can be determined based on actual production conditions.

In a possible implementation, the preset temperature is 30°C-60°C. Preferably, the above-mentioned preset temperature may be 45°C.

In the embodiment of the present application, a suitable preheating temperature can be selected according to the material of the temperature regulating device 20 and the film 30 to be processed.

As shown in Figure 5, the heating method used by the temperature regulating device 20 is radiant heating, and the distance between the diaphragm 30 to be processed and the temperature regulating device 20 is 50mm-200mm.

In the embodiment of the present application, the preheating process can be selected as radiant heating, which is carried out during the transfer process of the diaphragm 30 to be processed, without delaying the production efficiency, and the punching process is also a continuous one-time forming, ensuring production efficiency and production yield. Higher and lower production costs. The distance between the diaphragm 30 to be processed and the temperature adjustment device 20 can be flexibly adjusted according to the environment and the heating capacity of the device. Optionally, the temperature adjustment device 20 is an infrared radiation heating device, which is installed in a position where the infrared radiation heating panel is parallel to the aluminum plastic film. The heating device includes a controller, and the controller can control the heating time and heating temperature.

As shown in Figure 6, based on the above-mentioned battery case forming method, this application also discloses a stamping device for battery case forming, including: a punching punch 11; a concave template 12, and a concave template 12 with a There is a depression, and the outline of the depression is a regular shape or an irregular shape, and the depression matches the punching punch 11; the first pressing template 13 is arranged on the upper part of the concave template 12 for pressing the to-be-processed punch. The peripheral pressing area of the diaphragm 30 is processed; the second pressing template 14 is arranged on the upper part of the first pressing template 13 and is used to press the middle pressing area of the diaphragm 30 to be processed.

In the embodiment of the present application, the punching device includes a punching punch 11 and a lower concave template 12 arranged sequentially from top to bottom; a second pressing template 14 and a first pressing template 13 are arranged sequentially from top to bottom between the punching punch 11 and the lower concave template. The lower concave template 12 is a "Hu"-shaped template, and the lower concave template 12 is provided with a depression, and the contour of the depression is a regular shape or an irregular shape, and the depression matches the punching punch 11. The first pressing template 13 is arranged on the upper part of the lower concave template 12, and the first pressing template 13 is used to press the membrane 30 to be processed, and the first pressing template 13 is provided with a first concave, and the contour of the first concave matches the punching punch 11; the second pressing template 14 is arranged on the upper part of the first pressing template 13, and the second pressing template 14 is provided with a second concave, and the contour of the second concave matches the punching punch 11. The contour of the first concave has a maximum distance from the edge of the first pressing template 13, and the maximum distance is 5mm-30mm. The projection distance between the outer contour of the second pressing template 14 on the horizontal plane and the projection distance between the concave contour on the horizontal plane is 0.1mm-5mm. The punching punch 11 and the second concave are matched with each other in a clearance, and the clearance distance between the second concave and the punching punch 11 is 1mm-5mm. The surface roughness of the punching punch 11 is 1.0s-5.0s. The surface roughness of the inner pressing concave template is 3.0s.

During operation, the first pressing template 13 first cooperates with the concave template 12 to compress the outermost ring of the diaphragm 30 to be processed. The punching punch 11 is a punching forming die. When working, after the first pressing template 13 and the concave template 12 are pressed, the first stage of punching begins. This first stage of the process starts and ends when the punching punch 11 starts from the original position until it contacts the diaphragm 30 to be processed and punches to 0.25 to 0.35 times the target depth. The second stage of the process starts and ends from the depth at which the first stage of stamping is completed to the target depth. In some embodiments, the second stage of the process starts and ends from the depth at which the first stage of stamping is completed to 0.9 to 0.95 from the target depth. The third stage of the process starts and ends from the depth of the second stage of the process to the target depth. The second compression template 14 is also a "return" shaped template. When working, the second compression template 14 starts to descend when the second stage of punching is completed. When the second stage of punching is completed, the second compression template 14 and the lower The concave template 12 is tightened.

The stamping device also includes a driving motor 15. The second pressing template 14 is connected to the driving motor 15. The driving motor 15 is used to drive the lifting and lowering of the second pressing template 14.

In the embodiment of the present application, the second clamping template 14 is connected to the driving motor 15, and the driving motor 15 is used to drive the lifting of the second clamping template 14, and the maximum stroke of the second clamping template 14 on the vertical plane interferes with the upper surface of the first clamping template 13. Optionally, the first clamping template 13 includes a bottom plate and a side plate, and the driving motor 15 is arranged on the side plate. The driving motor 15 can also be arranged on other mounting structures. The punching device for the diaphragm 30 to be processed also includes a control system, which is used to control the movement and coordination of each component structure of the punching device for the diaphragm 30 to be processed.

As shown in Figures 3 and 4, the embodiment of the present application illustrates the punching and forming method of the battery case in combination with the above-mentioned stamping device. As shown in Figure 5, the aluminum-plastic film is first preheated by using the temperature adjustment device 20. The temperature adjustment device 20 is an infrared heat radiation device, which is heated during the transportation process of the aluminum-plastic film. The heating device consists of a time relay and a temperature relay. Dual control, heating time is 5 seconds, and the temperature requirement of the diaphragm to be processed after irradiation is 45°C.

After the aluminum-plastic film is preheated, it is transported to the stamping device. First, the control system controls the stamping mechanism to descend as a whole until the first clamping template 13 and the concave template 12 are clamped, and the clamping pressure requirement is 1-5Mpa. Then the punching punch 11 starts to descend and the first stage of punching is performed. When the punching forming depth reaches 1/3 of the target depth, the drive motor 15 starts to work and drives the second clamping template 14 to descend. The descending speed is lower than that of the punching punch 11, and the second stage of punching is performed at the same time. At this time, the punching can be directly performed to the target depth, or the third stage of punching can be performed to trim the formed shell. If the third stage of punching is performed, when the punching forming depth is 0.5mm away from the target depth, the second clamping template 14 completes the descent and completes the clamping with the concave template 12. The pressure requirement is 1-5Mpa, and the second stage of punching is completed. After that, the third stage of punching is carried out, and the punching punch 11 continues to descend to the target depth. The punching punch 11 plate is pressed against the concave template 12 with a pressure requirement of 1-5Mpa. After a delay of 0.1-5s, the punching punch 11 plate begins to rise, and after a delay of 0.1s-5s, the second pressing template 14 also begins to rise to the initial position to complete the punching.

The above-mentioned punching and forming process is a continuous punching process. The aluminum-plastic film is punched through the above-mentioned forming process. After completing the first step of punching, the thickness of the aluminum layer of the aluminum-plastic film is more than 90% of the initial thickness. After completing the second step, After the first stage of punching, the thickness of the plastic film aluminum layer is more than 75% of the initial thickness. After the third stage of punching, the thickness of the plastic film aluminum layer is more than 70% of the initial thickness.

In summary, after reading this detailed disclosure, those skilled in the art can understand that the foregoing detailed disclosure may be presented by way of example only, and may not be limiting. Although not explicitly stated herein, those skilled in the art will understand that this application is intended to cover various reasonable changes, improvements, and modifications to the embodiments. Such changes, improvements, and modifications are intended to be proposed by this disclosure and be within the spirit and scope of the exemplary embodiments of this disclosure.

Additionally, certain terms in this application have been used to describe embodiments of the present disclosure. For example, "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure or characteristic described in connection with the embodiment may be included in at least one embodiment of the present disclosure. Therefore, it is emphasized and should be understood that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various parts of this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures or characteristics may be combined as appropriate in one or more embodiments of the present disclosure.

It should be understood that in the foregoing description of embodiments of the present disclosure, in order to help understand a feature, and for the purpose of simplifying the disclosure, the present application sometimes combines various features in a single embodiment, drawing, or description thereof. Alternatively, the present application distributes various features in multiple embodiments of the present application. However, this does not mean that the combination of these features is necessary. It is entirely possible for those skilled in the art to extract some of the features as separate embodiments when reading this application. That is to say, the embodiments in this application can also be understood as the integration of multiple secondary embodiments. It is also true that each secondary embodiment resides in less than all features of a single previously disclosed embodiment.

In some embodiments, numbers expressing quantities or properties used to describe and claim certain embodiments of the present application are to be understood to be modified in some cases by the terms "about," "approximately," or "substantially." For example, unless otherwise specified, "about," "approximately," or "substantially" may mean a ±20% variation of the value it describes. Therefore, in some embodiments, the numerical parameters set forth in the written description and appended claims are approximations that may vary depending on the desired properties sought to be obtained by a particular embodiment. In some embodiments, numerical parameters should be interpreted in light of the number of reported significant digits and by applying ordinary rounding techniques. Although the numerical ranges and parameters set forth in the broad numerical ranges and parameters set forth in some embodiments of the present application are approximations, the specific examples are set forth to the most precise extent possible.

Each patent, patent application, publication of a patent application, and other material, such as articles, books, specifications, publications, documents, articles, etc., cited herein is hereby incorporated by reference. The entire contents for all purposes, except for the history of any prosecution documents related thereto, any identical prosecution documents that may be inconsistent or conflicting with this document, or any identical prosecution documents that may have a restrictive effect on the broadest scope of the claims. history. now or hereafter associated with this document. For example, if there is any inconsistency or conflict between the descriptions, definitions and/or use of terms associated with any included material, use of the terms, descriptions, definitions and/or use in this document terminology shall prevail.

Finally, it is to be understood that the embodiments of the application disclosed herein are illustrative of the principles of embodiments of the application. Other modified embodiments are within the scope of this application. Therefore, the embodiments disclosed in this application are merely examples and not limitations. Those skilled in the art may adopt alternative configurations to implement the applications in this application based on the embodiments in this application. Therefore, the embodiments of the present application are not limited to those embodiments precisely described in the application.

Claims (15)

1. A battery casing, characterized in that the casing is formed by segmented punching from a diaphragm to be processed, the casing has at least one target groove, and each of the target grooves corresponds to There is a preset processing area for the diaphragm to be processed, and the preset processing area is defined from outside to inside as a peripheral edge pressing area, a middle pressing area and a stamping contact area; The segmented punching pit includes a first punching pit and a second punching pit, wherein the first punching pit is to compress the peripheral edge blanking area and punch the punching contact area to form a first punching pit. A groove with a preset depth; the second punching pit is to continue punching the punching contact area, and at the same time gradually compress the intermediate pressing area to form the target groove; the diaphragm to be processed is processed as described There is a preset temperature before segmented pit punching. 2. The battery case according to claim 1, wherein the preset temperature is 30°C-60°C. 3 . The battery case according to claim 2 , wherein the first preset depth is 0.25-0.35 times the target groove depth. 4. The battery case according to claim 3, wherein the target groove is a circular groove or a polygonal groove, and the bottom edge of the target groove has rounded corners. 5. A battery case, characterized in that the case is formed by segmented punching from a diaphragm to be processed, the case has at least one target groove, and each target groove corresponds to There is a preset processing area for the diaphragm to be processed, and the preset processing area is defined from outside to inside as a peripheral edge pressing area, a middle pressing area and a stamping contact area; The segmented punching pit includes a first section punching pit, a second section punching pit and a third section punching pit, wherein the first section punching pit is to compress the peripheral blanking area and punch the punching pit The contact area forms a groove with a first preset depth; the second punching pit is to continue punching the punching contact area, and at the same time gradually compress the middle pressing area to form a groove with a second preset depth; The third stage of punching is to continue punching the punching contact area to form the target groove; the diaphragm to be processed has a preset temperature before the segmented punching. 6. The battery case according to claim 5, wherein the preset temperature is 30°C-60°C. 7. The battery case according to claim 6, wherein the first preset depth is 0.25-0.35 times the target groove depth; and/or the second preset depth is the target groove depth. 0.9-0.95 times the target groove depth. 8. The battery case according to claim 7, wherein the target groove is a circular groove or a polygonal groove, and the bottom edge of the target groove has rounded corners. 9. A battery case forming method, characterized by comprising: The diaphragm to be processed is punched in the first stage, wherein the diaphragm to be processed has a preset processing area, and the preset processing area is defined from outside to inside as a peripheral edge pressing area, a middle pressing area and a stamping contact area. , the first punching pit is to press the peripheral edge area, and punch the punching contact area to form a groove with a first preset depth; The membrane to be processed is subjected to a second stage of punching, wherein the second stage of punching is to continue punching the punching contact area and gradually press the middle pressing area to form a groove or a target groove with a second preset depth; before the first stage of punching is performed on the membrane to be processed, it also includes: passing the membrane to be processed through a temperature regulating device to reach a preset temperature. 10. The battery case forming method according to claim 9, characterized in that when the second section of punching pit is to form a groove with the second preset depth, the forming method further includes: The diaphragm is processed to perform a third stage of punching, and the third stage of punching is to continue punching the punching contact area to form a target groove. 11. The battery case forming method according to claim 10, wherein the first preset depth is 0.25-0.35 times of the target groove depth. 12. The battery case forming method according to claim 11, wherein the target groove is a circular groove or a polygonal groove, and the bottom edge of the target groove has rounded corners. 13. The battery case forming method according to claim 9, wherein the heating method used by the temperature adjustment device is radiation heating or contact heating. 14. The battery case forming method according to claim 13, wherein the preset temperature is 30°C-60°C. 15 . The battery shell forming method according to claim 14 , characterized in that the heating method adopted by the temperature regulating device is radiation heating, and the distance between the film to be processed and the temperature regulating device is 50 mm-200 mm.