Reducing winding needle

Abstract

The utility model relates to a variable diameter winding needle, including lock mouth, base and winding needle structure, two winding needle structure are arranged oppositely and install on the base, winding needle structure includes thimble, fixed link, fixed plate, outer needle guard, cam and cam seat, fixed link is fixed on the base by fixed plate, thimble is arranged between the two fixed link, the outer needle guard is fixed on the fixed link, and the cam seat is fixed on the fixed link. The cam seat is fixedly arranged on the outer needle sleeve, the cam is rotationally arranged on the cam seat, an inclined cam groove is formed in the ejector needle, and the cam moves along the inclined cam groove. According to the variable-diameter winding needle, the ejector pin is driven to move through the locking nozzle, and the cam is driven to move along the inclined cam groove, so that the outer needle sleeve is jacked up, the diameter and the perimeter of the winding needle are changed to eliminate the distance difference between tabs so as to align the tabs, the situation that a produced lithium battery cell does not meet the requirement and is scrapped is avoided, the production quality of the cell can be ensured, and the production efficiency is improved. After the cutter cuts off the diaphragm, the diaphragm push block pushes the end of the diaphragm into the gap between the winding needle structures, and the diaphragm pressing plate presses the diaphragm tightly, so that winding of the winding needle is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery production, in particular to a variable diameter winding needle. Background Art

[0002] During the manufacturing process of lithium battery cells, the pole piece and the diaphragm are rolled into a battery cell according to certain requirements through a series of actions of the winding head module. The alignment of the pole tabs on the pole piece is an important parameter of the battery cell quality. Sometimes, due to the difference in the thickness of the pole piece, the positive and negative pole tabs on the side of the battery cell are not aligned, causing the lithium battery cell produced to fail to meet the requirements and be scrapped. Changing the circumference of the winding needle is a way to align the pole tabs.

[0003] At present, the winding needles used in the lithium battery industry or other winding industries are fixed, which will result in the winding diameter being fixed; when the winding diameter needs to be adjusted, the winding needle can only be increased or decreased by replacing the winding needle or sticking a film on the winding needle, but this method is very time-consuming and labor-intensive, and the adjustment accuracy is very low, thus affecting the production quality of the battery cell and the overall production efficiency. Utility Model Content

[0004] The main purpose of the utility model is to provide a variable diameter winding needle to solve the above technical problems. When the pole ears are not aligned, the mechanism can eliminate the distance difference between the pole ears by quickly changing the circumference of the winding needle, thereby aligning the pole ears, ensuring the production quality of the battery cell and improving production efficiency.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A variable diameter needle winding comprises a locking mouth, a base and a needle winding structure, wherein two needle winding structures are arranged opposite to each other and mounted on the base, wherein the needle winding structure comprises an ejector pin, a fixing rod, a fixing plate, an outer needle sleeve, a cam and a cam seat, wherein the fixing plate fixes the fixing rod on the base, the ejector pin is arranged between the two fixing rods, the cam seat is fixed on the outer needle sleeve and passes through the fixing rod, the cam is rotatably arranged on the cam seat, an oblique cam groove is arranged on the ejector pin, the cam moves along the oblique cam groove, and the locking mouth is aligned with the ejector pin.

[0007] As a preferred technical solution, the winding needle structure further includes an elastic member, and the elastic member is installed between the base and the ejector pin.

[0008] As a preferred technical solution, the needle winding structure further includes an inner guide sleeve, the inner guide sleeve is fixed on the fixing rod, and the cam seat is inserted into the inner guide sleeve.

[0009] As a preferred technical solution, it further includes a cutting knife and a diaphragm push block, wherein the cutting knife and the diaphragm push block are aligned with the gap between the two winding needle structures, the cutting knife cuts the diaphragm, and the diaphragm push block pushes the cut diaphragm end into the gap between the two winding needle structures.

[0010] As a preferred technical solution, the needle winding structure further includes a diaphragm pressure plate, which is installed on the fixed rod. The cam moves along the oblique cam groove, and the cam seat lifts the diaphragm pressure plate to press the end of the diaphragm.

[0011] The beneficial effect of the utility model is that the above-mentioned variable diameter winding needle drives the ejector pin to move through the locking mouth, compresses the elastic part, and drives the cam to move along the inclined cam groove, so as to realize the lifting of the outer needle sleeve, so as to change the diameter and circumference of the winding needle to eliminate the distance difference between the pole ears, so as to align the pole ears, avoid the lithium battery cells produced not meeting the requirements and being scrapped due to the misalignment of the pole ear edges, ensure the quality of cell production, improve production efficiency, and provide a diaphragm pressing plate. After the cutting knife cuts the diaphragm, the diaphragm pushing block pushes the end of the diaphragm into the gap between the winding needle structures, and the diaphragm pressing plate presses the diaphragm to facilitate the winding of the winding needle. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The structure of the variable diameter winding needle involved in the utility model is shown in FIG. Figure 1 ;

[0013] Figure 2 for Figure 1 Cross-sectional view of the middle BB;

[0014] Figure 3 It is a side view of the variable diameter winding needle involved in the utility model;

[0015] Figure 4 The structure of the variable diameter winding needle involved in the utility model is shown in FIG. Figure 2 . DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0017] like Figure 1-4As shown, a variable diameter winding needle includes a locking mouth 3, a base 1, a winding needle structure 2, a cutting knife 5 and a diaphragm pushing block 4. The two winding needle structures 2 are arranged opposite to each other and installed on the base 1. The two winding needle structures 2 form a cylindrical structure, so that the material roll is wound on the winding needle structure 2 to form a battery cell. The cutting knife 5 and the diaphragm pushing block 4 are aligned with the gap between the two winding needle structures 2. The cutting knife 5 cuts the diaphragm, and the diaphragm pushing block 4 pushes the cut diaphragm end into the gap between the two winding needle structures 2. The two winding needle structures 2 clamp the diaphragm end, thereby driving the diaphragm to roll up.

[0018] Specifically, the needle winding structure 2 includes an ejector pin 24, a fixed rod 22, a fixed plate 23, an outer needle sleeve 21, a cam 26, a cam seat 25, an elastic member 28, an inner guide sleeve 29 and a diaphragm pressure plate 27. The fixed plate 23 fixes the fixed rod 22 on the base 1, the ejector pin 24 is arranged between the two fixed rods 22, the elastic member 28 is installed between the base 1 and the ejector pin 24, so that the ejector pin 24 moves away from the base 1, and the cam seat 25 is fixed on the outer needle sleeve 21. , and passes through the fixed rod 22, the cam 26 is rotatably set on the cam seat 25, the ejector 24 is provided with an oblique cam groove 241, the cam 26 moves along the oblique cam groove 241, the inner guide sleeve 29 is fixed on the fixed rod 22, and the cam seat 25 is inserted into the inner guide sleeve 29, the locking mouth 3 is aligned with the ejector 1, the diaphragm pressing plate 27 is installed on the fixed rod 22, the cam 26 moves along the oblique cam groove 241, and the cam seat 25 lifts the diaphragm pressing plate 27 to press the diaphragm end.

[0019] When the above-mentioned variable diameter winding needle is in use, the winding needle rotates to the winding position, the cutting knife 5 cuts the diaphragm, and the diaphragm push block 4 pushes the cut diaphragm end into the gap between the two winding needle structures 2. The locking mouth 3 extends and abuts against the ejector pin 24, compressing the elastic member 28, thereby moving the ejector pin 24, driving the cam 26 to move along the inclined cam groove 241 until the diameter formed by the two winding needle structures 2 reaches the specified size. At this time, the cam seat 25 lifts the diaphragm pressure plate 27 and presses the diaphragm end, so that the winding needle can start to roll.

[0020] The above-described embodiments are only preferred examples of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structures, features and principles described in the patent application scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A variable diameter winding needle, characterized in that: It includes a locking mouth, a base and a winding needle structure, wherein the two winding needle structures are arranged opposite to each other and installed on the base, and the winding needle structure includes an ejector pin, a fixing rod, a fixing plate, an outer needle sleeve, a cam and a cam seat, wherein the fixing plate fixes the fixing rod on the base, the ejector pin is arranged between the two fixing rods, the cam seat is fixed on the outer needle sleeve and passes through the fixing rod, the cam is rotatably arranged on the cam seat, an oblique cam groove is arranged on the ejector pin, the cam moves along the oblique cam groove, and the locking mouth is aligned with the ejector pin.

2. The variable diameter winding needle according to claim 1, characterized in that: The winding needle structure further includes an elastic member, and the elastic member is installed between the base and the ejector pin.

3. The variable diameter winding needle according to claim 2, characterized in that: The needle winding structure further includes an inner guide sleeve, which is fixed on the fixing rod, and the cam seat is inserted into the inner guide sleeve.

4. The variable diameter winding needle according to claim 2 or 3, characterized in that: It further includes a cutting knife and a membrane push block, wherein the cutting knife and the membrane push block are aligned with the gap between the two winding needle structures, the cutting knife cuts the membrane, and the membrane push block pushes the cut membrane end into the gap between the two winding needle structures.

5. The variable diameter winding needle according to claim 4, characterized in that: The needle winding structure further includes a diaphragm pressing plate, which is mounted on the fixing rod. The cam moves along the oblique cam groove, and the cam seat lifts up the diaphragm pressing plate to press the end of the diaphragm.

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