CN-121988605-A - Pole piece rolling device and method

CN121988605ACN 121988605 ACN121988605 ACN 121988605ACN-121988605-A

Abstract

The application provides a pole piece rolling device and a method thereof, wherein the device comprises a pressure bearing roller, an embossing roller and a supporting mechanism; the bearing roller is configured to clamp the target piece between the bearing roller and the embossing roller and roll the target piece, the supporting mechanism comprises a bearing surface, a supporting piece and an arch surface, the bearing surface is located on the protruding side of the arch surface, the supporting piece is located between the bearing surface and the arch surface, two ends of the supporting piece are respectively connected with the bearing surface and the arch surface, the curvature axis of the arch surface is not parallel to the length direction of the embossing roller, and the embossing roller is arranged on one surface of the bearing surface, which is opposite to the arch surface. According to the pole piece rolling device, the embossing roller is directly borne by the bearing surface, and the bearing surface is supported by the arch surface through the supporting piece, so that the load in the embossing process is dispersed, the problem that the pressure is concentrated in the middle area of the roller surface is solved, the embossing precision is improved, and the quality of a battery is improved.

Inventors

YANG XIANMING
LI ZHIWEI
XU ZHIWU
CHENG ZHUO
YUAN HAOBO
JIANG TAO

Assignees

因湃电池科技有限公司

Dates

Publication Date: 20260508
Application Date: 20260320

Claims (10)

1. The pole piece rolling device is characterized by comprising a pressure bearing roller, an embossing roller and a supporting mechanism; the pressure-bearing roller is configured to clamp the target piece between the pressure-bearing roller and the embossing roller, and roll the target piece; The supporting mechanism comprises a bearing surface, a supporting piece and an arch surface; The bearing surface is positioned on the convex side of the arch surface; The supporting pieces are positioned between the bearing surface and the arch surface, and the number of the supporting pieces is at least three, wherein the spacing between any two adjacent supporting pieces is equal; the two ends of the supporting piece are respectively connected with the bearing surface and the arch surface; the curvature axis of the arch surface is not parallel to the length direction of the embossing roller; the embossing roller is arranged on one surface of the bearing surface, which is opposite to the arch surface; The arch surface and the supporting piece are symmetrical compared with a first symmetrical surface, wherein the first symmetrical surface is a plane passing through the curvature axis and perpendicular to the length direction of the embossing roller.
2. The pole piece roll-in device of claim 1, further comprising a mount; the mounting piece is arranged on one surface of the bearing surface, which is opposite to the arch surface; The mounting part is provided with a mounting part and a supporting part, and the mounting part is respectively and rotatably connected with two ends of the embossing roller; the supporting part is provided with a supporting part length direction which is perpendicular to the length direction of the embossing roller and parallel to the bearing surface.
3. The pole piece rolling device of claim 2, wherein the bearing surface is provided with a groove; the groove is recessed toward the arch face and is configured to accommodate the embossing roller; The mounting part is a mounting strip, the mounting part of the mounting strip is positioned at the middle part of the mounting strip, and the supporting part of the mounting strip is the rest part except the middle part; The length direction of the supporting part is consistent with the length direction of the mounting strip.
4. The pole piece roll-in device of claim 3, wherein the number of embossing rolls is N and the number of mountings is M, wherein N = M "1; The mounting pieces are arranged along the length direction of the embossing roller; the two ends of the embossing roller are respectively and rotatably connected with the supporting parts of the two adjacent mounting pieces.
5. The pole piece roll-in device of claim 1, wherein the embossing roll comprises a roll body, a first embossing structure, and a second embossing structure; The roller body is provided with a rolling surface; The first embossing structure includes a first embossing unit, and the second embossing structure includes a second embossing unit; The first embossing unit spirals on the rolling surface from the first end of the roller body to the middle part of the roller body in a first spiral direction; The second embossing unit spirals on the rolling surface from the second end of the roller body to the middle part of the roller body in a second spiral direction; wherein the first spiral direction is opposite to the second spiral direction.
6. The pole piece roll-in device of claim 5, wherein the first embossed structure is symmetrical to a second embossed structure second plane of symmetry, wherein the second plane of symmetry is a cross-section of the roll body.
7. The pole piece rolling method is characterized by being applied to a pole piece rolling device, wherein the pole piece rolling device comprises a pressure bearing roller, an embossing roller and a driving piece; The method comprises the following steps: acquiring the speed of the driving piece for driving the target piece to move; determining a pressure value of the pressure applied by the pressure-receiving roller to the embossing roller according to the speed, and And controlling the pressure bearing roller to apply pressure to the embossing roller according to the pressure value.
8. The method of claim 7, wherein the pole piece rolling device further comprises a pneumatic drive source and a pressure regulating valve; The method for determining the pressure value of the pressure applied by the pressure-bearing roller to the embossing roller according to the speed comprises the steps of determining the opening of the pressure regulating valve according to the speed; and controlling the pressure-bearing roller to apply pressure to the embossing roller according to the pressure value, wherein the pressure-bearing roller is controlled to control the pressure regulating valve according to the opening degree.
9. The method of claim 7, wherein said determining a pressure value at which said backing roll applies pressure to said embossing roll based on said speed comprises: Calculating the pressure value according to a pressure calculation formula, wherein the pressure calculation formula is as follows: Wherein P represents the pressure value, v represents the velocity, AR represents the aspect ratio of the embossing unit, k 1 、k 2 、k 3 is a coefficient, k 1 =(1/AR)+0.1,k 2 =2, respectively (1/AR)+0.2,k 3 =3.33 (1/AR)+0.47。
10. A battery comprising a pole piece manufactured according to the pole piece rolling device of any one of claims 1 to 6 and/or a pole piece manufactured according to the pole piece rolling method of any one of claims 7 to 9.

Description

Pole piece rolling device and method Technical Field The application relates to the technical field of battery manufacturing, in particular to a pole piece rolling device and a pole piece rolling method. Background In the field of manufacturing, especially in the manufacture of lithium ion batteries, it is often necessary to perform a surface microstructure treatment, i.e. "embossing", on the electrode sheet to improve electrolyte wettability, inhibit warpage of the electrode sheet, and promote interface contact stability, etc. The embossing process generally applies controllable pressure to a continuously-moving pole piece through a pair of roller bodies rotating in opposite directions, and forms a concave-convex structure on the surface of the pole piece in a regular distribution. In the traditional embossing device, the embossing roller adopts a cantilever or simply supported beam type mounting structure supported by bearings at two ends, namely, the roller shaft is fixed by the frame at the left side and the right side, and the middle part is not additionally supported. However, as lamination processes progress to higher speeds (single lamination tact. Ltoreq.0.125 seconds), conventional embossing devices are prone to mid-deflection under operating loads. Because of the increase of the width of the pole piece, the pressure is concentrated in the middle area of the roller surface, so that the embossing depth is unevenly distributed in the middle depth and the two sides are shallow along the length direction of the roller, and the embossing precision is affected. Disclosure of Invention The application aims to provide a pole piece rolling device and a pole piece rolling method, which are characterized in that a bearing surface is used for directly bearing an embossing roller, and an arch surface supports the bearing surface through a supporting piece, so that the load in the embossing process can be dispersed, and the problem that the pressure is concentrated in the middle area of the roller surface is solved, so that the embossing precision is improved. In particular, the precision of embossing the pole piece can be improved, thereby improving the quality of the battery. The application provides a pole piece rolling device which comprises a pressure bearing roller, an embossing roller and a supporting mechanism, wherein the pressure bearing roller is configured to clamp a target piece between the pressure bearing roller and the embossing roller, the supporting mechanism comprises a bearing surface, a supporting piece and an arch surface, the bearing surface is positioned on the protruding side of the arch surface, the supporting piece is positioned between the bearing surface and the arch surface, two ends of the supporting piece are respectively connected with the bearing surface and the arch surface, the curvature axis of the arch surface is not parallel to the length direction of the embossing roller, and the embossing roller is arranged on one surface of the bearing surface opposite to the arch surface. According to the pole piece rolling device, the embossing roller is directly borne by the bearing surface and supported by the arch surface through the supporting piece, the reaction force of the embossing roller is converted into pressure along the arch tangential direction of the arch path, the load in the embossing process is effectively dispersed, the pressure is further improved to be concentrated in the middle area of the roller surface, the embossing depth is caused to be unevenly distributed in the middle depth and the two sides in the length direction of the roller, the embossing precision is improved, and the quality of a battery is improved. With reference to the first aspect, the number of the supporting pieces is at least three, and the spacing between any two adjacent supporting pieces is equal. According to the pole piece rolling device, the number of the supporting pieces is at least three, the supporting pieces are uniformly distributed, the acting points for load transmission between the bearing surface and the arch surface are increased, so that the distribution of interaction force between the bearing surface and the arch surface in the embossing process is further dispersed, and the local stress for promoting the embossing roller to bend is further reduced. Thereby, the quality of the embossing is further improved. With reference to the first aspect, the arch surface and the supporting piece are symmetrical relative to a first symmetrical surface, wherein the first symmetrical surface is a plane passing through the curvature axis and perpendicular to the length direction of the embossing roller. According to the pole piece rolling device, through the symmetrical arch surface and the support piece design, on the basis of converting the reaction force of the embossing roller into the pressure along the arch tangential direction of the arch path, the symmetrical design enables the su