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CN-121529019-B - Winding device, winding method, battery cell and device for battery cell assembly

CN121529019BCN 121529019 BCN121529019 BCN 121529019BCN-121529019-B

Abstract

The embodiment of the application relates to the field of energy storage, and provides a winding device, a winding method, a battery monomer and a device of a battery cell assembly, wherein the winding device comprises a plurality of traction roller groups, a winding mechanism and a winding mechanism, wherein each traction roller group comprises a plurality of traction rollers, and at least two traction rollers in each traction roller group are provided with a heating device; the hot-press type winding device comprises a winding mechanism, a hot-press module, a winding equipment and an environment heating module, wherein the winding mechanism is used for winding a winding material to form a winding core, the hot-press module is used for hot-press shaping the winding core, the winding equipment is provided with a cavity, the winding mechanism, the hot-press module and a plurality of traction roller groups are positioned in the cavity, and the environment heating module is used for heating the cavity. The winding equipment of the battery cell assembly provided by the embodiment of the application can at least improve the production efficiency of the battery cell.

Inventors

  • LIU GUO
  • CHEN SHOUMIN
  • YANG ZIXIANG

Assignees

  • 浙江晶科储能有限公司

Dates

Publication Date
20260505
Application Date
20260108

Claims (16)

  1. 1. A winding apparatus for a cell assembly, comprising: a plurality of pull roll sets for conveying the wound material to the winding mechanism, each pull roll set comprising a plurality of pull rolls, at least two of the pull rolls in each pull roll set being provided with a heating device; the winding mechanism is used for winding the winding material to form a winding core; the hot-pressing module is used for hot-pressing and shaping the winding cores; the winding device is provided with a cavity, and the winding mechanism, the hot pressing module and the traction roller groups are positioned in the cavity; and the environment heating module is used for heating the cavity.
  2. 2. The winding apparatus of the cell assembly of claim 1, wherein the winding material comprises a positive winding material, a negative winding material, and a separator winding material, the plurality of pull roll sets comprising: the first traction roller group is used for conveying the positive electrode winding material; A second traction roller group for conveying the negative electrode winding material; a third set of pull rolls for transporting the separator winding material; the first pull roll set includes a plurality of pull rolls sequentially arranged along a conveying direction of the positive electrode winding material; The second pull roll set includes a plurality of the pull rolls sequentially arranged in the conveying direction of the negative electrode wound material; The third pulling roll group includes a plurality of the pulling rolls sequentially arranged in the conveyance direction of the separator winding material.
  3. 3. The winding apparatus of a battery cell assembly according to claim 2, wherein an operating temperature of each of the pull rolls in the first pull roll group increases by a first preset gradient temperature along the transport direction of the positive electrode winding material within a first preset temperature range, the operating temperature of each of the pull rolls in the second pull roll group increases by a second preset gradient temperature along the transport direction of the negative electrode winding material within a second preset temperature range, and the operating temperature of each of the pull rolls in the third pull roll group increases by a third preset temperature gradient along the transport direction of the separator winding material within a third preset temperature range.
  4. 4. The winding apparatus of claim 3, wherein the operating temperature of the hot press module is greater than or equal to the operating temperature of the pull rolls of each of the pull roll sets nearest the hot press module.
  5. 5. The winding apparatus of the cell assembly of claim 1, wherein the winding apparatus further comprises: and the conveying device is used for conveying the winding cores formed by the winding mechanism to the hot-pressing module.
  6. 6. The winding device of a cell assembly according to claim 1, characterized in that an insulating layer is provided on the housing of the winding device and/or on the inner wall of the cavity.
  7. 7. The winding apparatus of the cell assembly of claim 1, wherein the winding apparatus further comprises: the positive electrode unreeling assembly is used for providing positive electrode winding materials for the traction roller set; The negative electrode unreeling assembly is used for providing negative electrode winding materials for the traction roller set; and the diaphragm unreeling assembly is used for providing diaphragm winding materials for the traction roller group.
  8. 8. A winding method of a cell assembly, applied to the winding apparatus of a cell assembly according to any one of claims 1 to 7, characterized in that the winding method comprises: Controlling an environment heating module to heat the cavity so that the environment temperature of the cavity reaches a preset temperature; Heating each traction roller according to a preset mapping relation table of the traction rollers and target working temperatures so that the temperature of each traction roller reaches the target working temperature corresponding to each traction roller; Conveying the corresponding winding materials to a winding mechanism by adopting the heated traction roller set, and winding the winding materials by adopting the winding mechanism to obtain winding cores, wherein the winding materials are in one-to-one correspondence with the traction roller set; And hot-pressing the winding core by adopting a hot-pressing module to obtain the shaping winding core.
  9. 9. The method of winding a cell assembly of claim 8, wherein the predetermined temperature is 50 ℃ to 70 ℃.
  10. 10. The winding method of a cell assembly according to claim 8, wherein the pull roll set includes a first pull roll set for transporting a positive electrode winding material, the target operating temperature of the pull roll of the first pull roll set that is farthest from the hot press module is 65 ℃ to 75 ℃, and the target operating temperature of the pull roll of the first pull roll set that is closest to the hot press module is 90 ℃ to 100 ℃.
  11. 11. The winding method of a cell assembly according to claim 8, wherein the pull roll set includes a second pull roll set for transporting a negative electrode winding material, the target operating temperature of the pull roll of the second pull roll set that is farthest from the hot press module is 65 ℃ to 75 ℃, and the target operating temperature of the pull roll of the second pull roll set that is closest to the hot press module is 90 ℃ to 100 ℃.
  12. 12. The winding method of a cell assembly according to claim 8, wherein the pull roll set includes a third pull roll set for conveying a separator winding material, the target operating temperature of the pull roll of the third pull roll set that is farthest from the hot press module is 65 ℃ to 75 ℃, and the target operating temperature of the pull roll of the third pull roll set that is closest to the hot press module is 90 ℃ to 95 ℃.
  13. 13. A battery cell, characterized in that the battery cell comprises a cell assembly, which is prepared by the winding device of the cell assembly according to any one of claims 1 to 7 or by the winding method of the cell assembly according to any one of claims 8 to 12, the cell assembly comprising a positive electrode sheet, a negative electrode sheet and a separator.
  14. 14. A battery device, comprising the battery cell of claim 13, wherein the battery device comprises one or more of a battery module, a battery pack, and an energy storage battery.
  15. 15. An electrical device, characterized in that it comprises a battery device according to claim 14, the battery device is used for providing electric energy.
  16. 16. An energy storage device comprising the battery device of claim 14 for storing electrical energy.

Description

Winding device, winding method, battery cell and device for battery cell assembly Technical Field The application relates to the field of energy storage, in particular to winding equipment of a battery cell assembly, a winding method of the battery cell assembly, a battery cell, a battery device, an electricity utilization device and an energy storage device. Background The production of lithium battery cells typically requires multiple independent processes. First, after the battery cell is wound in the winding device, it needs to be transferred to a preheating furnace for preheating to ensure that the material reaches a proper temperature. And then, the preheated battery cells are transferred to a hot press again for hot press shaping, and the transfer and waiting processes among the plurality of independent devices obviously reduce the production efficiency. In addition, the number and the volume of the equipment also greatly increase the floor area of the production line and the purchase and maintenance cost of the equipment. Disclosure of Invention The embodiment of the application provides winding equipment of a battery cell assembly, a winding method of the battery cell assembly, a battery cell, a battery device, an electricity utilization device and an energy storage device, and at least solves the problem of low production efficiency of the battery cell. According to some embodiments of the application, an aspect of the embodiment provides a winding device of a battery cell assembly, which comprises a plurality of traction roller groups, wherein the traction roller groups are used for conveying winding materials to a winding mechanism, each traction roller group comprises a plurality of traction rollers, at least two traction rollers in each traction roller group are provided with heating devices, the winding mechanism is used for winding the winding materials to form a winding core, a hot pressing module is used for hot pressing and shaping the winding core, the winding device is provided with a cavity, and the winding mechanism, the hot pressing module and the traction roller groups are positioned in the cavity, and an environment heating module is used for heating the cavity. In some embodiments, the winding material comprises a positive winding material, a negative winding material and a separator winding material, the plurality of traction roller sets comprises a first traction roller set for conveying the positive winding material, a second traction roller set for conveying the negative winding material, a third traction roller set for conveying the separator winding material, the first traction roller set comprises a plurality of traction rollers sequentially arranged along a conveying direction of the positive winding material, the second traction roller set comprises a plurality of traction rollers sequentially arranged along the conveying direction of the negative winding material, and the third traction roller set comprises a plurality of traction rollers sequentially arranged along the conveying direction of the separator winding material. In some embodiments, the operating temperature of each of the pull rolls in the first pull roll set increases by a first preset gradient temperature along the transport direction of the positive electrode winding material within a first preset temperature range, the operating temperature of each of the pull rolls in the second pull roll set increases by a second preset gradient temperature along the transport direction of the negative electrode winding material within a second preset temperature range, and the operating temperature of each of the pull rolls in the third pull roll set increases by a third preset temperature gradient along the transport direction of the separator winding material within a third preset temperature range. In some embodiments, the operating temperature of the hot press module is greater than or equal to the operating temperature of the pull rolls of each of the pull roll sets that are closest to the hot press module. In some embodiments, the winding apparatus further comprises a transfer device for transferring the winding cores formed by the winding mechanism to the hot press module. In some embodiments, an insulating layer is provided on the housing of the winding device and/or on the inner wall of the cavity. In some embodiments, the winding apparatus further comprises a positive electrode unwind assembly for providing positive electrode winding material to the pull roll set, a negative electrode unwind assembly for providing negative electrode winding material to the pull roll set, and a separator unwind assembly for providing separator winding material to the pull roll set. According to some embodiments of the present application, another aspect of the embodiments provides a winding method of an electrical core assembly, including controlling an environmental heating module to heat a cavity so that an environmental te