US-20260125234-A1 - WINDING PIN, WINDING APPARATUS, BATTERY MANUFACTURING DEVICE, AND WINDING METHOD

US20260125234A1US 20260125234 A1US20260125234 A1US 20260125234A1US-20260125234-A1

Abstract

A winding apparatus includes a winding pin, a pair of first clamp pins configured to move away from each other after the winding pin is withdrawn from an electrode assembly to stretch the electrode assembly, and second clamp pin(s) configured to support an upper half portion of the electrode assembly in a process of stretching the electrode assembly. The winding pin includes a winding pin body, with an outer peripheral surface thereof being provided with a pair of first grooves spaced apart along a circumferential direction of the winding pin body and configured to accommodate the first clamp pins. The outer peripheral surface of the winding pin body is further provided with second groove(s) spaced apart from the first grooves along the circumferential direction of the winding pin body and configured to accommodate the second clamp pin(s).

Inventors

Yuquan AI
Chuanyu WEI

Assignees

CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Dates

Publication Date: 20260507
Application Date: 20260102
Priority Date: 20230703

Claims (17)

1 . A winding pin, comprising: a winding pin body, wherein: an outer peripheral surface of the winding pin body is provided with a pair of first grooves, the first groove is configured to accommodate a first clamp pin, and the pair of first grooves are spaced apart along a circumferential direction of the winding pin body; and the outer peripheral surface of the winding pin body is further provided with at least one second groove, the second groove is configured to accommodate a second clamp pin, and the second groove is spaced apart from the first grooves along the circumferential direction of the winding pin body.
2 . The winding pin according to claim 1 , wherein the pair of first grooves are spaced apart by 180° along the circumferential direction of the winding pin body.
3 . The winding pin according to claim 1 , wherein in the circumferential direction of the winding pin body, an angle α between the second groove and one of the first grooves meets 45° ≤ α ≤ 90°.
4 . The winding pin according to claim 3 , wherein 60° ≤ α ≤ 90°.
5 . The winding pin according to claim 3 , wherein 85° ≤ α ≤ 90°.
6 . The winding pin according to claim 1 , wherein the outer peripheral surface of the winding pin body is divided by the pair of first grooves into a first region and a second region, the second groove is provided in plurality, and the plurality of second grooves are all disposed in the first region.
7 . The winding pin according to claim 1 , wherein the pair of first grooves are symmetrically disposed with respect to a first plane, a central axis of the winding pin body lies on the first plane, the second groove is provided in plurality, and the plurality of second grooves are symmetrically disposed with respect to the first plane.
8 . The winding pin according to claim 1 , wherein the first grooves and the second groove both penetrate the winding pin body along an axial direction of the winding pin body.
9 . The winding pin according to claim 1 , wherein the winding pin body comprises a first winding pin portion and a second winding pin portion, a gap is defined between the first winding pin portion and the second winding pin portion, the second groove and one of the first grooves are disposed on an outer peripheral surface of the first winding pin portion, and the other first groove is disposed on an outer peripheral surface of the second winding pin portion.
10 . A winding apparatus for winding and forming an electrode assembly, comprising: the winding pin according to claim 1 ; a pair of first clamp pins, wherein the pair of first clamp pins are configured to move away from each other after the winding pin is withdrawn from the electrode assembly to stretch the electrode assembly; and at least one second clamp pin, wherein the second clamp pin is configured to support an upper half portion of the electrode assembly in a process of stretching the electrode assembly by the pair of first clamp pins.
11 . The winding apparatus according to claim 10 , wherein the second clamp pin has a first wall surface facing away from a central axis of the winding pin body, and the first wall surface is configured as a curved surface.
12 . The winding apparatus according to claim 10 , further comprising: a heating element, connected to the second clamp pin for heating the second clamp pin.
13 . The winding apparatus according to claim 12 , wherein the heating element is a resistive element.
14 . The winding apparatus according to claim 10 , further comprising: a first driving member and a second driving member, wherein the first driving member is connected to the pair of first clamp pins for driving the pair of first clamp pins to move away from each other along a first direction, and the second driving member is connected to the second clamp pin for driving the second clamp pin to move along a second direction, wherein the first direction and the second direction intersect.
15 . A battery manufacturing device, comprising the winding apparatus according to claim 10 .
16 . A winding method, comprising: providing the winding pin according to claim 1 ; winding electrode plates and an isolating film with the winding pin to form an electrode assembly; inserting a pair of first clamp pins into the pair of first grooves, and inserting a second clamp pin into the second groove; withdrawing the winding pin from the electrode assembly; moving the pair of first clamp pins away from each other to stretch the electrode assembly; and in a process of stretching the electrode assembly, supporting an upper half portion of the electrode assembly with the second clamp pin.
17 . The winding method according to claim 16 , wherein the supporting an upper half portion of the electrode assembly with the second clamp pin is performed such that a moving speed of a region of the upper half portion in contact with the second clamp pin is less than or equal to a moving speed of a region of a lower half portion of the electrode assembly directly facing the second clamp pin.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of International Application No. PCT/CN2024/084027, filed on March 27, 2024, which claims priority to Chinese Patent Application No. 202310807055.2, filed on July 3, 2023, entitled "WINDING PIN, WINDING APPARATUS, BATTERY MANUFACTURING DEVICE, AND WINDING METHOD," the entire contents of which are incorporated herein by reference. TECHNICAL FIELD This application relates to the field of battery production technologies, and more particularly, to a winding pin, a winding apparatus, a battery manufacturing device, and a winding method. BACKGROUND Energy saving and emission reduction are crucial to the sustainable development of the automobile industry. Electric vehicles, with their advantages in energy conservation and environmental protection, have become an important part of sustainable development of the automobile industry. For electric vehicles, battery technology is an important factor in connection with their development. In the development of battery technologies, how the reliability of batteries is improved is an urgent technical problem that needs to be solved in battery technologies. SUMMARY This application provides a winding pin, a winding apparatus, a battery manufacturing device, and a winding method, which can improve the reliability of the battery. This application is achieved through the following technical solutions: According to a first aspect, this application provides a winding pin including a winding pin body, where an outer peripheral surface of the winding pin body is provided with a pair of first grooves, the first groove is configured to accommodate a first clamp pin, and the pair of first grooves are spaced apart along a circumferential direction of the winding pin body; and the outer peripheral surface of the winding pin body is further provided with at least one second groove, the second groove is configured to accommodate a second clamp pin, and the second groove is spaced apart from the first grooves along the circumferential direction of the winding pin body. The technical solution of the embodiments of this application provides a pair of circumferentially spaced first grooves and a second groove distinct from the first grooves on the outer peripheral surface of the winding pin body. During use, the pair of first grooves are disposed on two sides in a vertical direction, and the second groove is disposed above a line connecting the pair of first grooves. An electrode assembly is wound and formed on the outer peripheral surface of the winding pin body, the first grooves accommodate the first clamp pins, and the second groove accommodates the second clamp pin, thereby determining positions of the first clamp pins and the second clamp pin. In a subsequent stretching process of the electrode assembly, the second clamp pin, whose position is determined by the second groove, abuts against an upper half portion of the electrode assembly. This reduces a descending speed of the upper half portion, thereby reducing the risk of collapse in the upper half portion due to excessive descent of the upper half portion caused by gravity, which could lead to wrinkling. This also reduces the probability of tab folding when tabs are located in the upper half portion, thereby reducing the risk of lithium precipitation in the electrode assembly, improving the reliability of a battery cell, and thus improving the reliability of a battery. In some embodiments, the pair of first grooves are spaced apart by 180° along the circumferential direction of the winding pin body. The technical solution of the embodiments of this application arranges the pair of first grooves 180° apart on the outer peripheral surface of the winding pin body, where the electrode assembly is wound and formed on the outer peripheral surface of the winding pin body, and the pair of first grooves are disposed on two sides in the vertical direction, meaning that the pair of first grooves are located on a diameter of the electrode assembly in a horizontal direction. The first groove is configured to accommodate the first clamp pin. In the subsequent stretching process of the electrode assembly, the first clamp pins move away from each other along the horizontal direction, enabling the best stretching effect for the electrode assembly and facilitating the arrangement of the second groove, thereby improving the convenience. In some embodiments, in the circumferential direction of the winding pin body, an angle between the second groove and one of the first grooves is denoted as α, meeting 45° ≤ α ≤ 90°. The technical solution of the embodiments of this application provides that the angle between the second groove and one of the first grooves is α. During use, the pair of first grooves are horizontally disposed, and the second groove is disposed above the first grooves. The first groove is configured to accommodate the first clamp pin, and the second groove is confi