CN106299207B - Lithium ion twisting type battery diaphragm punching device - Google Patents

Abstract

The utility model provides a die-cut device of formula battery diaphragm is turned round to lithium ion, relates to lithium ion battery technical field, including base, clamp plate and punching block, four corners of base are equipped with one respectively and are used for assembling the clamp plate and make the clamp plate along the cylinder of its up-and-down motion, the base upper surface is equipped with the charging tray that is used for placing the diaphragm and weighing paper, it has cross recess to open on the charging tray, in the recess of charging tray is arranged in to the punching block, the lower surface of punching block is equipped with a plurality of drift. The device can realize the quick and complete punching of the lithium ion button cell diaphragm, can effectively ensure the punching quality, greatly improves the utilization rate of the diaphragm and has good operability and safety.

Description

A lithium-ion twist battery separator punching device

technical field

The invention relates to the technical field of lithium ion batteries, and more particularly to a lithium ion twist type battery separator punching device.

Background technique

Lithium-ion button batteries are generally composed of negative electrode cover, nickel foam, negative electrode sheet, diaphragm, positive electrode sheet, electrolyte, and positive electrode cover. The diaphragm is a high value-added material with the highest technical barriers for power lithium batteries, and the current market supply is serious. Insufficient, mainly rely on imports, expensive. In the production process of button battery, the separator needs to be punched into a circular sheet structure, but the separator has strong toughness, it is not easy to cut into a suitable size, and the edges are prone to burrs. The integrity of the separator is one of the key factors that directly affects the performance of the battery. one.

Most of the ordinary punching machines are crankshaft connecting rod mechanisms, which have a large impact force during use, the pressure is difficult to be uniform, and the cutter head is easy to wear, so it is necessary to manually adjust the punching position, resulting in a low utilization rate of the diaphragm. In order to prevent the diaphragm from being dirty and to obtain multiple diaphragms at one time, the traditional method of punching the diaphragm is to fold the diaphragm in a Z shape, place the weighing paper between the layers of the diaphragm, and finally fold the folded diaphragm and punch. , and the gasket are put into a small air press to complete the diaphragm punching. However, manual folding of the diaphragm is difficult to ensure the folding quality, which is time-consuming and labor-intensive, and the gasket and punch are located above and below the folding diaphragm, respectively. The relative size of the gasket and the punch is small, and the folding diaphragm is a flexible body. Putting it into a small air press will cause the problem that the pressure position of the diaphragm is difficult to ensure and the pressure is uneven.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a lithium ion twist type battery diaphragm punching device, which can realize the rapid and complete punching of the diaphragm, and solves the problem of the low utilization rate of the diaphragm in the traditional punching method, the difficulty in ensuring the pressure position of the diaphragm and the inability to receive pressure. Uniform question.

The technical problem to be solved by the present invention is realized by the following technical solutions.

A lithium ion twist type battery diaphragm punching device, comprising a base, a pressure plate and a punch block, four corners of the base are respectively provided with a cylinder for assembling the pressure plate and moving the pressure plate up and down along the base, the base The upper surface of the seat is provided with a feeding tray for placing the diaphragm and weighing paper, the feeding tray is provided with a cross-shaped groove, the punching block is placed in the groove of the feeding tray, and the lower surface of the punching block is provided with a cross-shaped groove. Several punches.

Further, the cross-shaped groove of the feeding tray is a superposition of a transverse rectangular groove for placing the diaphragm and a longitudinal square groove for placing the weighing paper.

Further, the size of the square groove is the same as the size of the weighing paper, and the width of the rectangular groove is the same as the width of the diaphragm.

Further, the punching block is a cross-shaped structure matched with the groove of the material tray.

Further, the punches are evenly distributed.

Further, the punch includes a cutter head fixedly connected to the bottom surface of the punch block, the cutter head is a cylindrical thin-walled cavity structure, and the end of the cavity is equipped with a cylindrical soft punch.

The working principle and working process of the present invention are:

Before using the device to punch the lithium-ion button battery separator, the separator needs to be cut to the same length as the rectangular slot. Place a piece of weighing paper in the square slot, then place a layer of diaphragm in the rectangular slot to cover the above weighing paper, stack the weighing paper and the diaphragm in sequence, stack the corresponding number of layers as needed, and the top layer of the final stack is Weighing paper.

After the diaphragm and weighing paper are stacked, fit the punch block with the groove of the material tray. At this time, the multi-punch head contacts the stacking body, and then place the punch block and the material tray on the upper surface of the base, and the pressing plate moves downward to apply it. Press on the punch block, at this time the soft punch slowly retracts into the cutter head, and the cutter head punches the diaphragm. When the cutter head completes the punching of the diaphragm, the pressing plate moves up along the cylinder of the base, the elasticity of the soft punch is restored, and the end of the cutter head extends out, which can effectively prevent the diaphragm from entering the inner cavity of the cutter head.

The beneficial effects of the present invention are as follows: the present invention avoids the Z-shaped folding of the diaphragm, and can well ensure the stacking quality; the grooves and punches of the material tray are both cross-shaped structures, and the cooperation of the two ensures that the pressing direction is perpendicular to the surface of the diaphragm , and the diaphragm is uniformly stressed, which can greatly improve the punching quality of the diaphragm, so that the diaphragm still has good performance even after long-term use; the punch block is designed with multiple punches, and the punches are kept at a reasonable small distance. The utilization rate of the diaphragm is greatly improved, and the rapid and complete punching of the diaphragm is realized.

Description of drawings

Fig. 1 is the structural representation of this punching device;

Fig. 2 is the structural representation of the material tray;

Fig. 3 is the structural representation of punch block;

Figure 4 is a schematic structural diagram of a single punch;

FIG. 5 is a schematic structural diagram of a stack of diaphragms and weighing paper.

Detailed ways

In order to make the technical means, creation features, achievement goals and effects of the present invention easy to understand and understand, the present invention will be further described below with reference to the specific drawings.

As shown in FIG. 1, a lithium-ion twist type battery diaphragm punching device includes a base 1, a pressure plate 2 and a punch block 4. A circular through hole is opened at four corners of the pressure plate 2 respectively. Four corners are respectively provided with a cylinder for assembling the pressing plate and making the pressing plate move up and down along it, and the upper surface of the base 1 is provided with a diaphragm 5 and a weighing paper 6 (the weighing paper is a commercially available square scale). There is a cross-shaped groove (shown in FIG. 2 ) on the feeding tray 3, and the groove is a transverse rectangular groove 32 for placing the diaphragm 5 and for placing the weighing paper 6. The superposition of the longitudinal square grooves 31. The size of the square groove 31 is the same as that of the weighing paper 6 , and the width of the rectangular groove 32 is the same as the width of the diaphragm 5 .

The punching block 4 is placed in the groove of the material tray 3. The punching block 4 is a cross-shaped structure that matches the groove of the material tray 3. The lower surface of the punching block 4 is provided with a number of punches 42 (as shown in FIG. 3 ). ), the punch 42 includes a cutter head 421 fixedly connected to the bottom surface of the punch block 4, the cutter head 421 is a cylindrical thin-walled cavity structure, and the end of the cavity is equipped with a cylindrical soft punch 422 ( shown in Figure 4). The punches 42 are evenly distributed.

Before using the device to punch the lithium ion button battery separator, the separator 5 needs to be cut into the same length as the rectangular groove 32 . A piece of weighing paper 6 is placed in the square groove 31, then a layer of diaphragm 5 is placed in the rectangular groove 32 to cover the above-mentioned weighing paper 6, the weighing paper 6 and diaphragm 5 are stacked in sequence, and the corresponding number of layers is stacked as required, and The uppermost layer of the final stack is the weighing paper 6 (shown in Figure 5). This stacking method avoids the Z-shaped folding of the diaphragm 6 and can well ensure the stacking quality.

After the diaphragm 5 and the weighing paper 6 are stacked, the punch 4 is matched with the groove of the tray 3. At this time, the multi-punch 42 contacts the stack, and then the punch 4 and the tray 3 are placed on the base 1. On the surface, the pressing plate 2 moves downward to press on the punching block 4. At this time, the soft punch 422 is slowly retracted into the cutter head 421, and the cutter head 421 punches the diaphragm. When the cutter head 421 completes the punching of the diaphragm 5, the pressing plate 2 moves upward along the cylinder of the base 1, the elasticity of the soft punch 422 is restored, and the end of the cutter head 421 extends, which can effectively prevent the diaphragm 6 from entering the inner cavity of the cutter head 421. .

The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments, and the descriptions in the above-mentioned embodiments and the description are only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have Various changes and modifications fall within the scope of the claimed invention. The claimed scope of the present invention is defined by the appended claims and their equivalents.

Claims (4)

1. A lithium ion twist-type battery diaphragm punching device, comprising a base, a pressing plate and a punch block, the four corners of the base are respectively provided with a cylinder for assembling the pressing plate and making the pressing plate move up and down along it, which It is characterized in that: the upper surface of the base is provided with a feeding tray for placing the diaphragm and weighing paper, the feeding tray is provided with a cross-shaped groove, the punching block is placed in the groove of the feeding tray, and the punching The lower surface of the block is provided with a number of punches; the cross-shaped groove of the feed tray is the superposition of the transverse rectangular groove for placing the diaphragm and the longitudinal square groove for placing the weighing paper. 2 . The lithium-ion twist battery separator punching device according to claim 1 , wherein the size of the square groove is the same as the size of the weighing paper, and the width of the rectangular groove is the same as the width of the separator. 3 . . 3. A lithium-ion twist type battery separator punching device according to claim 1, wherein the punching block is a cross-shaped structure matching with the groove of the material tray. 4. A lithium-ion twist-type battery diaphragm punching device according to claim 1, wherein the punch comprises a cutter head fixedly connected to the bottom surface of the punch block, and the cutter head is a cylindrical thin-walled Cavity structure, the end of the cavity is equipped with a soft punch of cylindrical structure.