A type of tab-resistant printing device

Abstract

This invention discloses an electrode tab bending resistance printing device, aiming to solve the problem of weak bending resistance of thin electrode tabs. The invention includes an unwinding roller wound with electrode tab material, a guide roller, and an impression roller assembly. The electrode tab material, drawn from the unwinding roller, passes through the guide roller and enters the impression roller assembly. The impression roller assembly includes an impression roller and an abutment roller. The impression roller is equipped with a printing punch, and the abutment roller is equipped with a printing groove corresponding to the printing mark. The electrode tab material passes between the impression roller and the abutment roller, and the impression roller assembly imprints at least two support ribs onto the electrode tab material. Through this arrangement, the bending resistance of the electrode tab material is enhanced while maintaining its thickness, thereby reducing the defect rate and the rate of sheet rejection.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing, and more specifically, to a tab bending anti-printing device. Background Technology

[0002] The tabs in a battery are components used to carry electron transfer. To achieve higher energy density, researchers tend to reduce the thickness of the tabs to accommodate more cells. However, thinner tabs have weaker bending strength; for the same width, thinner tabs tend to sag more. For wound cells, the tab extending from the negative electrode also tends to bend closer to the center. Such tabs are prone to folding and falling into the electrode sheet after die-cutting, leading to battery failure and affecting yield.

[0003] This application aims to address the weakness of thin tabs in bending strength by proposing an online imprinting roller device to improve tab sagging during die cutting. This device can provide greater bending strength to the tabs at the same thickness, thereby improving the yield of the battery. Summary of the Invention

[0004] This invention overcomes the weakness of thin tabs in bending resistance and provides a tab bending resistance printing device that can provide greater bending resistance for tabs of the same thickness, thereby improving battery yield.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] An anti-bending printing device for electrode tabs includes an unwinding roller, a guide roller, and an impression roller assembly. The electrode tab material led out by the unwinding roller passes through the guide roller and enters the space between the impression roller assemblies. The impression roller assembly includes an impression roller and an abutment roller. The impression roller is provided with a printing punch, and the abutment roller is provided with a printing groove corresponding to the printing mark. The electrode tab material passes between the impression roller and the abutment roller, and the impression roller assembly impressions at least two support ribs onto the electrode tab material.

[0007] This application improves the bending strength of the tabs by providing support ribs, resulting in a lower bending amplitude of the tabs under the same conditions. The support ribs on the tab strip are formed by an impression roller device. The impression roller creates corresponding imprints on the tab strip, which constitute the support ribs. These support ribs transform the tab strip from a sheet into a three-dimensional structure with a supporting structure, thereby enhancing the bending resistance of the tab strip. An unwinding roller outputs the tab strip, which is guided by a guide roller. The tab strip is always taut on the tab bending printing device.

[0008] Preferably, the imprinted position of the tab strip at the device outlet is located on the upper side of the tab strip. This structure causes the printing indentation to face downwards. This structure also results in different bending resistance on the two sides of the tab strip; by setting the imprinted position on the upper side, the tab strip at the device outlet exhibits stronger downward bending resistance in its corresponding orientation.

[0009] Preferably, the impression roller is located above the abutment roller. This structure produces the print on the upper side.

[0010] Preferably, the impression roller assembly is equipped with a pressure sensor to detect pressure. The distance between the impression roller and the abutment roller is controlled by the pressure sensor to prevent damage to the impression roller.

[0011] Preferably, the support rib is arranged along the length direction of the tab strip.

[0012] Preferably, the sidewall of the printing roller is provided with a printing punch along the circumferential direction of the printing roller. The perimeter of the cross-section of the printing roller is adapted to the preset die-cutting length of the tab material strip, and the lowest point of the printing punch is flush with the surface of the printing roller. The tab material strip is cut out by die-cutting. Because the printed tab material strip has high bending strength, it will deform and stack during die-cutting due to compression, affecting the die-cutting quality and causing burrs and flash. With this structure, the lowest point of the printing punch is used to create a non-printing area to facilitate die-cutting and form a die-cutting position with better quality.

[0013] Preferably, the sidewall of the printing roller is provided with a printing punch along the circumferential direction of the printing roller, and the printing punch has protrusions on both sides. The protrusions form a U-shaped imprint on the sidewall of the support rib formed by the printing groove, and the imprint enhances the bending strength.

[0014] Preferably, the sidewall of the printing roller is provided with a printing punch along the circumferential direction of the printing roller, and the printing punch has raised dots on both sides. Through this structure, a number of periodically arranged U-shaped imprints are obtained in the support ribs formed by the printing punch. These imprints can strengthen the bending strength of the bottom side of the U-shaped imprints, thereby further enhancing the bending resistance of the tab material strip.

[0015] Preferably, the printing punch is annular, with protrusions arranged around the circumferential direction of the printing punch.

[0016] Preferably, the distance between adjacent bumps is adapted to the height of the printing die so that the imprints formed by adjacent bumps do not overlap. This structure ensures that the imprints of each U-shape are not repeated, avoiding the situation where repeated imprints cause excessive deformation and brittleness.

[0017] Preferably, the supporting ribs are inclined.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] The above settings enhance the bending resistance of the tab strip while maintaining its thickness, thereby reducing the defect rate and the rate of sheet rejection. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the device of the present invention;

[0021] Figure 2 This is a schematic diagram of the printing roller of the present invention;

[0022] Figure 3 This is a cross-sectional view of the printing roller of the present invention at the printing punch;

[0023] Figure 4 This is a schematic diagram of the tab material strip of the present invention;

[0024] Figure 5 yes Figure 4 Cross-sectional view at point AA;

[0025] In the picture:

[0026] 1. Electrode material belt, 2. Unwinding roller, 3. Guide roller, 4. Imprinting roller, 5. Abutment roller, 6. Pressure sensor, 7. Printing die, 8. Embossing point, 9. Support rib, 10. U-shaped imprint. Detailed Implementation

[0027] The present disclosure will be further described below with reference to the accompanying drawings and embodiments.

[0028] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0029] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0030] In this disclosure, terms such as "fixed connection," "connected," and "linked" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can determine the specific meaning of these terms in this disclosure based on the specific circumstances, and they should not be construed as limitations on this disclosure.

[0031] Example 1:

[0032] A bending-resistant printing device for tab ears. Refer Figure 1 As shown, it includes an unwinding roller 2 around which a tab ear strip 1 is wound, a guiding roller 3, and an impression pair-roller device. The tab ear strip 1 led out by the unwinding roller 2 enters between the impression pair-roller device after passing through the guiding roller 3. A printing punch 7 is provided on the impression roller 4, and a printing groove corresponding to the printing mark is provided on the abutting roller 5. The tab ear strip 1 passes between the impression roller 4 and the abutting roller 5, and the impression pair-roller device imprints at least two support ribs 9 on the tab ear strip 1.

[0033] The imprinted position of the tab ear strip 1 at the outlet of the device is located on the upper side of the tab ear strip 1. With this structure, the depression direction of the printing is downward. With this structure, the bending resistance of both sides of the tab ear strip 1 is different. By setting the imprinted position on the upper side, the downward bending resistance of the tab ear strip 1 at the outlet position of the device in the corresponding posture is stronger. The impression roller 4 is located above the abutting roller 5. This structure makes the printed pattern formed on the upper side.

[0034] A pressure sensor 6 for detecting pressure is provided on the impression pair-roller device. The distance between the impression roller 4 and the abutting roller 5 is controlled by the pressure sensor 6 to avoid damaging the impression roller 4. In some embodiments, the position of the impression roller 4 or the abutting roller 5 is adjustable, and at least one of them can be adjusted in the height direction as needed, so as to change the distance between the impression roller 4 and the abutting roller 5, and further control the reasonable pressure of the impression pair-roller device on the tab ear strip 1 through the pressure sensor 6. Among them, the adjustment of the position of the impression roller 4 or the abutting roller 5 can be either manual or automatic. In the automatic solution, in this embodiment, the telescopic end of a cylinder or a motor is used for driving and control.

[0035] This application improves the bending resistance of the tab ear by providing support ribs 9 for the tab ear, so that the downward bending amplitude of the tab ear is lower under the same conditions. The support ribs 9 on the tab ear strip 1 are formed by the impression pair-roller. The impression roller 4 produces corresponding imprints on the tab ear strip 1, and these imprints constitute the support ribs 9. The support ribs 9 make the tab ear strip 1 change from a sheet body to a three-dimensional structure with a support structure, and the support ribs 9 strengthen the bending resistance of the tab ear strip 1. The unwinding roller 2 is used to output the tab ear strip 1, and the tab ear strip 1 is guided by the guiding roller 3. The tab ear strip 1 is always tensioned on the bending-resistant printing device for tab ears.

[0036] Refer Figure 2 As shown, in this embodiment, the setting of the printing marks on the impression roller 4 is related to the bending resistance of the tab ear strip 1. Specifically, in some embodiments, the support ribs 9 are arranged along the length direction of the tab ear strip 1. In other embodiments, the support ribs 9 are inclined lines.

[0037] Example 2:

[0038] This embodiment further has the following structure based on Embodiment 1:

[0039] As shown in Figure 3 , a printing punch 7 along the circumferential direction of the imprinting roller 4 is provided on the side wall of the imprinting roller 4. The perimeter of the cross-section of the printing roller is adapted to the preset die-cutting length of the tab strip 1. The lowest point of the printing punch 7 is flush with the surface of the imprinting roller 4. The tab strip 1 is die-cut to cut out tabs. Since the printed tab strip 1 has a relatively large bending strength, when die-cutting, the tab strip 1 will deform and stack under compression, affecting the die-cutting quality and causing burrs and flash. With this structure, the lowest point of the printing punch 7 is used to create a non-printing area for convenient die-cutting, forming a die-cutting position with better quality.

[0040] As shown in Figure 4 and 5 , the reinforcing ribs in Figure 5 are in an exaggerated state for easy understanding, and the actual deformation amount is not large. A printing punch 7 along the circumferential direction of the imprinting roller 4 is provided on the side wall of the imprinting roller 4. Convex points 8 are provided on both sides of the printing punch 7. U-shaped imprints are formed on the side wall of the support rib 9 manufactured through the printing groove by the convex points 8, and the imprints strengthen the bending strength. A printing punch 7 along the circumferential direction of the imprinting roller 4 is provided on the side wall of the imprinting roller 4. Convex points 8 are provided on both sides of the printing punch 7. A number of periodically arranged U-shaped imprints 10 are obtained in the support rib 9 formed by the printing punch 7 through this structure. The imprints can strengthen the bending strength on one side of the bottom of the U-shape, and further strengthen the bending resistance of the tab strip 1. The printing punch 7 is annular, and the convex points 8 are arranged along the circumferential direction of the printing punch 7.

[0041] Among them, the distance between adjacent convex points 8 is adapted to the height of the printing punch 7 so that the imprints formed by adjacent convex points 8 do not overlap. This structure makes the imprints of each U-shape non-repetitive, avoiding the situation of excessive deformation and brittleness caused by repeated imprints.

[0042] The convex points are hemispherical.

[0043] The above-described embodiments are only preferred solutions of the present invention, and do not impose any form of limitation on the present invention. There are other variants and modifications without exceeding the technical solutions recorded in the claims.

Claims

1. A tab-type anti-bending printing device, characterized in that, The device includes an unwinding roller, a guide roller, and an impression roller assembly, all of which contain a strip of tab material wound on it. The strip of tab material led out by the unwinding roller passes through the guide roller and enters the space between the impression roller assemblies. The impression roller assembly includes an impression roller and a contact roller. The impression roller is provided with a printing punch, and the contact roller is provided with a printing groove corresponding to the print mark. The strip of tab material passes between the impression roller and the contact roller. The impression roller assembly prints at least two support ribs onto the strip of tab material. The impression roller produces corresponding print marks on the strip of tab material, and these print marks constitute the support ribs. The side wall of the printing roller is provided with a printing punch along the circumferential direction of the printing roller, and the printing punch has protrusions on both sides. The printing punch is ring-shaped, with the protrusions evenly spaced around the circumferential direction of the printing punch; The distance between adjacent bumps is adapted to the height of the printing die so that the imprints formed by adjacent bumps do not overlap.

2. The electrode tab anti-bending printing device according to claim 1, characterized in that, The imprinted position of the tab material strip at the outlet of the imprinting roller device is located on the upper side of the tab material strip.

3. The electrode tab anti-bending printing device according to claim 2, characterized in that, The impression roller is located above the abutment roller.

4. The electrode tab anti-bending printing device according to claim 1, characterized in that, The impression roller device is equipped with a pressure sensor to detect pressure.

5. The electrode tab anti-bending printing device according to claim 1, characterized in that, The side wall of the printing roller is provided with a printing punch along the circumferential direction of the printing roller. The circumference of the cross-section of the printing roller is adapted to the preset die-cut length of the tab material strip. The lowest point of the printing punch is flush with the surface of the printing roller.

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