CN-121536766-B - Pole piece deviation rectifying method, system, equipment and storage medium

CN121536766BCN 121536766 BCN121536766 BCN 121536766BCN-121536766-B

Abstract

The application belongs to the technical field of battery cell manufacturing, and discloses a pole piece deviation rectifying method, a pole piece deviation rectifying system, pole piece deviation rectifying equipment and a pole piece deviation rectifying storage medium. The method comprises the steps of responding to roll changing operation of an anode pole piece and/or a cathode pole piece in a battery core winding process, obtaining film width variation of the pole piece after roll changing relative to the pole piece of the same type before roll changing, and obtaining coating width of an anode pole piece coating area of a wound battery core before roll changing on a tab side and a strip side to a cathode pole piece coating area, wherein the film width is the width of the coating area on the pole piece, predicting coating width of a battery core to be wound on the tab side and the strip side after roll changing based on the film width variation and the coating width, determining deviation amount of the coating width of the battery core to be wound on the tab side and the strip side, and adjusting transverse position of the anode pole piece or the cathode pole piece when entering a winding needle based on the deviation amount. The method effectively reduces the difference between the coating widths of the battery cell on the tab side and the strip side, so that the coating widths on the two sides are distributed more evenly.

Inventors

ZHOU XIAOKANG
HU DIANGANG
GAO CONGYING
WU WEIBIN
Fu Zisen
LUO YU
ZHENG XIAOYU
LI DECHAO
FANG YANSONG
ZHANG XIN
WU YIDONG

Assignees

宁德时代新能源科技股份有限公司
宁德时代润智软件科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260121

Claims (15)

1. The pole piece deviation rectifying method is characterized by comprising the following steps of: In the battery core winding procedure, responding to the winding operation of the anode pole piece and/or the cathode pole piece, acquiring the film width variation of the pole piece after winding relative to the pole piece of the same type before winding, and acquiring the coating width of the wound battery core on the anode pole piece coating area of the tab side and the slitting side to the cathode pole piece coating area before winding, wherein the film width is the width of the coating area on the pole piece; Based on the film width variation and the coating width, predicting the coating width of the battery core to be wound on the tab side and the slitting side after reel change; determining the deviation amount of the wrapping width of the battery core to be wound between the tab side and the strip side; based on the deviation amount, adjusting the transverse position of the anode pole piece or the cathode pole piece when entering a winding needle; The method for predicting the wrapping width of the battery core to be wound after reel change on the tab side and the strip side based on the film width variation and the wrapping width comprises the following steps: determining the wrapping width of the wound battery core on the slitting side as the wrapping width of the battery core to be wound on the slitting side; and determining the wrapping width of the battery core to be wrapped on the tab side based on the wrapping width of the wrapped battery core on the tab side and the film width variation of the pole piece after the reel change relative to the pole piece of the same type before the reel change.
2. The method of claim 1, wherein the obtaining the film width variation of the pole piece after the change relative to the pole piece of the same type before the change comprises: for a cathode pole piece, acquiring a pole piece width variation after reel change relative to a pole piece before reel change, a first surface ceramic edge width variation and a second surface ceramic edge width variation; And determining the difference value of the width variation of the pole piece and the width variation of the first surface ceramic edge as the first surface film width variation of the cathode pole piece, and determining the difference value of the width variation of the pole piece and the width variation of the second surface ceramic edge as the second surface film width variation of the cathode pole piece.
3. The method of claim 2, wherein obtaining a change in width of the pole piece after a change relative to the pole piece before the change for the cathode pole piece comprises: The edge positions of the cathode pole piece on the tab side and the strip side before reel change and the edge positions of the cathode pole piece on the tab side and the strip side after reel change are obtained; determining a first variation of the edge position of the cathode pole piece at the lug side pole piece and a second variation of the edge position of the strip side pole piece after reel change relative to the reel change; And determining the change of the width of the cathode pole piece after reel change relative to the cathode pole piece before reel change based on the first change and the second change.
4. The method of claim 2, wherein obtaining a first side ceramic edge width variation and a second side ceramic edge width variation for the cathode sheet after the change relative to the before the change comprises: acquiring the widths of the first ceramic sides of the cathode pole pieces before and after reel changing, and determining the variation of the widths of the first ceramic sides of the cathode pole pieces based on the widths of the first ceramic sides of the cathode pole pieces before and after reel changing; And acquiring the widths of the ceramic edges of the second face of the cathode pole piece before and after the roll changing, and determining the width variation of the ceramic edges of the second face of the cathode pole piece based on the widths of the ceramic edges of the second face of the cathode pole piece before and after the roll changing.
5. The method of claim 4, wherein said obtaining the width of the first ceramic edge of the cathode sheet before and after the roll change comprises: Acquiring a plurality of first-face ceramic edge width measurement values of the cathode pole piece before reel change, and determining the first-face ceramic edge width of the cathode pole piece before reel change based on the plurality of first-face ceramic edge width measurement values; and acquiring a plurality of first-face ceramic edge width measurement values of the cathode pole piece after reel change, and determining the first-face ceramic edge width of the cathode pole piece after reel change based on the plurality of first-face ceramic edge width measurement values.
6. The method of claim 1, wherein the obtaining the film width variation of the pole piece after the change relative to the pole piece of the same type before the change comprises: For the anode pole piece, acquiring the width variation of the pole piece after reel change relative to the pole piece before reel change; And determining the width variation of the pole piece as the film width variation of the anode pole piece.
7. The method of claim 6, wherein the obtaining, for the anode pole piece, the change in pole piece width after the change relative to before the change comprises: the method comprises the steps of obtaining the edge positions of the anode pole piece on the tab side and the strip side before reel change and the edge positions of the anode pole piece on the tab side and the strip side after reel change; determining a first variation of the edge position of the anode pole piece at the lug side pole piece and a second variation of the edge position of the slitting side pole piece after reel change relative to the reel change; And determining the change of the width of the anode pole piece after the reel change relative to the width of the anode pole piece before the reel change based on the first change and the second change.
8. The method of claim 1, wherein determining the wrap width of the to-be-wound cell on the tab side based on the wrap width of the wound cell on the tab side and a film width variation of a post-change pole piece relative to a pole piece of the same type prior to a change, comprises: Determining the first surface coating width of the battery core to be wound on the tab side based on the first surface coating width of the wound battery core on the tab side, the film width variation of the anode pole piece and the first film width variation of the cathode pole piece; determining the second face coating width of the battery core to be wound on the tab side based on the second face coating width of the wound battery core on the tab side, the film width variation of the anode pole piece and the second film width variation of the cathode pole piece; And determining the smaller cladding width of the first surface cladding width and the second surface cladding width as the cladding width of the battery cell to be wound on the tab side.
9. The method of any of claims 1-8, wherein adjusting the lateral position of the anode or cathode electrode sheet as it enters a winding needle based on the amount of deviation comprises: determining one-half of the deviation amount as a roll-in deviation correcting parameter, or determining the product of one-half of the deviation amount and an adjustment coefficient as the roll-in deviation correcting parameter, wherein the adjustment coefficient is a numerical value between 0 and 1; and adjusting the transverse position of the anode pole piece or the cathode pole piece when the anode pole piece enters the winding needle based on the winding deviation correcting parameter.
10. The method of any of claims 1-8, wherein the wound cells comprise the last N cells that have completed winding prior to reel change, the N being a natural number greater than 0; the electric core to be wound comprises M electric cores to be wound, wherein M is a natural number greater than 0.
11. A cell winding system, the system comprising: The detection equipment is arranged on the pole piece transmission device and is used for determining the film width variation of the pole piece after reel change relative to the pole piece of the same type before reel change and the coating width of the wound electric core before reel change on the cathode pole piece coating area at the tab side and the strip side in the electric core winding process, wherein the film width is the width of the coating area on the pole piece; the winding needle is arranged at the downstream of the detection equipment and is used for winding the anode pole piece and the cathode pole piece to form a bare cell; The processor is used for responding to the winding operation of the anode pole piece and/or the cathode pole piece, acquiring the film width variation and the coating width, determining the coating width of the wound battery core on the slitting side as the coating width of the battery core to be wound on the slitting side after winding, and determining the coating width of the battery core to be wound on the tab side based on the coating width of the wound battery core on the tab side and the film width variation of the pole piece relative to the pole piece of the same type before winding after winding; The processor is further used for determining the deviation amount of the wrapping width of the battery core to be wound between the tab side and the strip side; and the deviation correcting device is arranged at the downstream of the detection equipment and is used for adjusting the transverse position of the anode pole piece or the cathode pole piece when entering the winding needle based on the deviation.
12. The system of claim 11, wherein the pole piece transport device comprises an anode pole piece feed mechanism and a cathode pole piece feed mechanism, the detection apparatus comprising a plurality of laser sensors and a plurality of first image acquisition members; The laser sensors are respectively arranged on the strip splitting side and the tab side of the anode pole piece feeding mechanism and the strip splitting side and the tab side of the cathode pole piece feeding mechanism and are used for determining the edge positions of the pole pieces before and after reel change; The first image acquisition pieces are arranged on the cathode pole piece feeding mechanism and are used for determining the widths of the ceramic edges on two sides of the cathode pole piece before and after reel changing; The processor is used for determining the film width variation of the anode pole piece based on the pole piece edge positions of the anode pole piece before and after reel change and determining the film width variation of the cathode pole piece based on the pole piece edge positions of the cathode pole piece before and after reel change and the ceramic edge widths of the two sides.
13. The system of claim 11, wherein the detection device comprises a plurality of second image acquisition members; The second image acquisition pieces are respectively arranged on the tab side and the strip dividing side of the winding needle and are used for determining the wrapping widths of the wound battery cell on the tab side and the strip dividing side.
14. A pole piece deviation rectifying device, characterized in that the device comprises a memory, a processor and a pole piece deviation rectifying program stored on the memory and running on the processor, the pole piece deviation rectifying program being configured to implement the steps of the pole piece deviation rectifying method according to any one of claims 1 to 10.
15. A storage medium having stored thereon a pole piece deviation correcting program which when executed by a processor implements the steps of the pole piece deviation correcting method according to any one of claims 1 to 10.

Description

Pole piece deviation rectifying method, system, equipment and storage medium Technical Field The application relates to the technical field of battery cell manufacturing, in particular to a pole piece deviation rectifying method, a pole piece deviation rectifying system, pole piece deviation rectifying equipment and a storage medium. Background In the winding manufacturing process of the lithium ion battery cell, the coating width of the anode pole piece coating area on the tab side and the slitting side to the cathode pole piece coating area is critical to the performance of the cell. If the coating widths on the two sides are unevenly distributed, the coating on one side is insufficient, the short circuit risk is increased, and the material waste and the energy density reduction are caused on the other side, so that the safety and the consistency of the battery cell are affected. In actual production, when the anode or cathode pole piece is rolled up, the coating areas of different rolls have different widths, so that the laminating position between the anode pole piece and the cathode pole piece is changed after the roll is rolled up, and further, the coating widths of the tab side and the slitting side are at risk of exceeding the lower limit. At present, effective dynamic regulation and control means are lacked aiming at the problem of unbalanced coating width caused by reel change. The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present application and is not intended to represent an admission that the foregoing is prior art. Disclosure of Invention The application mainly aims to provide a pole piece deviation rectifying method, a pole piece deviation rectifying system, pole piece deviation rectifying equipment and a pole piece deviation rectifying storage medium, which can effectively reduce the difference between the wrapping widths of a battery cell on a pole lug side and a strip side, and enable the wrapping width distribution on two sides to be more even. In a first aspect, the present application provides a pole piece deviation rectifying method, the method comprising the steps of: In the battery core winding procedure, responding to the winding operation of the anode pole piece and/or the cathode pole piece, acquiring the film width variation of the pole piece after winding relative to the pole piece of the same type before winding, and acquiring the coating width of the wound battery core on the anode pole piece coating area of the tab side and the slitting side to the cathode pole piece coating area before winding, wherein the film width is the width of the coating area on the pole piece; Based on the film width variation and the coating width, predicting the coating width of the battery core to be wound on the tab side and the slitting side after reel change; determining the deviation amount of the wrapping width of the battery core to be wound between the tab side and the strip side; and adjusting the transverse position of the anode pole piece or the cathode pole piece when the anode pole piece enters the winding needle based on the deviation amount. In the embodiment of the application, considering that in the winding process of the battery cell, the film width change of the pole pieces before and after the winding can directly lead to the relative position deviation of the anode pole piece coating area and the cathode pole piece coating area, thereby causing the change of the coating width of the anode pole piece coating area on the tab side and the strip side to the cathode pole piece coating area, the film width change of the pole pieces after the winding relative to the pole pieces of the same type before the winding is obtained in response to the winding operation of the anode pole piece and/or the cathode pole piece, and the coating width actual measurement value of the wound battery cell before the winding is combined on the tab side and the strip side is used for predicting the coating width of the battery cell to be wound after the winding is replaced on the tab side and the strip side. And determining the deviation amount between the wrapping widths of the tab side and the slitting side based on the prediction result so as to quantify the unbalance degree of the wrapping width distribution caused by the reel change operation. The lateral position of the anode or cathode sheet as it enters the winding needle is then adjusted based on the amount of deviation. The adjustment of the winding position directly changes the stacking standard of the subsequent pole pieces, and the relative positions of the cathode pole pieces and the anode pole pieces can be corrected in advance before winding starts, so that the difference between the wrapping widths of the battery cells to be wound on the tab side and the slitting side is effectively reduced, the uniform distribution of the wrapping widths on the two sides is realized, an