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KR-102964733-B1 - Electrode assembly and related battery, device, manufacturing method and manufacturing device

KR102964733B1KR 102964733 B1KR102964733 B1KR 102964733B1KR-102964733-B1

Abstract

The present application discloses an electrode assembly and related battery, device, manufacturing method and manufacturing device, wherein the electrode assembly comprises at least one positive plate and at least one negative plate, the sum of the number of all positive plates and all negative plates is 3 or more, and the at least one positive plate and the at least one negative plate are wound on a winding axis to form a winding structure, wherein in the winding structure, the positive plate of the at least one positive plate and the negative plate of the at least one negative plate are arranged in an overlapping manner along a direction perpendicular to the winding axis, and each of the at least one positive plate comprises a positive body portion, and at least a portion of the overlapping surface area of the positive body portion is a positive active material area, and each of the at least one negative plate comprises a negative body portion, and at least a portion of the overlapping surface area of the negative body portion is a negative active material area, and both ends along the winding axis direction of the negative active material area extend beyond the corresponding end of the adjacent positive active material area.

Inventors

  • 리앙, 청두
  • 슈, 후
  • 진, 하이주
  • 쩡, 위췬

Assignees

  • 컨템포러리 엠퍼렉스 테크놀로지 (홍콩) 리미티드

Dates

Publication Date
20260513
Application Date
20200602

Claims (17)

  1. It comprises at least one positive plate and at least one negative plate, wherein the sum of the number of all positive plates and all negative plates is 3 or more, and the at least one positive plate and the at least one negative plate are wound around a winding axis to form a winding structure, and in the winding structure, one positive plate among the at least one positive plate and one positive plate among the at least one negative plate are arranged in an overlapping manner along a direction perpendicular to the winding axis; Each of the at least one anode plate comprises an anode body portion, and at least a portion of the overlapping surface area of the anode body portion is an anode active material region; each of the at least one cathode plate comprises a cathode body portion, and at least a portion of the overlapping surface area of the cathode body portion is a cathode active material region, and both ends of the cathode active material region along the winding axis extend beyond the corresponding ends of the adjacent anode active material region; If the number of at least one positive plate is 2 or more, the positions of the first winding initial ends of at least two positive plates are arranged staggered in the circumferential direction of the winding structure and/or; if the number of at least one negative plate is 2 or more, the positions of the second winding initial ends of at least two negative plates are arranged staggered in the circumferential direction of the winding structure; In other radial directions of the above winding structure, the difference in the total number of layers of all positive plates and all negative plates does not exceed the number of preset layers, and An electrode assembly in which the number of the above-mentioned preset layers is less than or equal to the sum of the number of all positive plates and all negative plates.
  2. An electrode assembly according to claim 1, characterized in that both ends along the winding axis of the cathode active material region exceed the corresponding ends of the adjacent anode active material region by a range of 0.2 to 5 mm.
  3. An electrode assembly according to claim 1, wherein the positive plate further comprises at least one positive tab portion extending outwardly along the winding axis direction from the positive body portion, and the negative plate further comprises at least one negative tab portion extending outwardly along the winding axis direction from the negative body portion.
  4. An electrode assembly according to claim 3, wherein a portion of the anode body portion is a first insulating layer coating portion, the first insulating layer coating portion is disposed on the side adjacent to the anode tab portion of the anode active material portion, and a first end adjacent to the cathode tab portion along the winding axis direction of the cathode body portion is disposed in the first insulating layer coating portion.
  5. In claim 3, the cathode active material region covers the entire overlapping surface along the winding axis direction of the cathode body part, and the second end of the cathode body part is spaced apart from the cathode tab part along the winding axis direction and extends beyond the anode active material region, forming an electrode assembly.
  6. An electrode assembly according to claim 1, wherein when the number of at least one positive plate is 2 or more, the position of the first winding tail end of the positive plate is different and/or; and when the number of at least one negative plate is 2 or more, the position of the second winding tail end of the negative plate is different.
  7. In claim 1, the winding structure is flat and includes a flattened region and a rotating region disposed on both sides of the flattened region; An electrode assembly in which the first winding tail end of at least one positive plate is disposed in the rotational region and/or; and the second winding tail end of at least one negative plate is disposed in the rotational region.
  8. An electrode assembly according to claim 1, characterized in that the outermost layer and the innermost layer of the winding structure are both negative plates.
  9. Housing; and A battery comprising an electrode assembly according to any one of claims 1 to 8, wherein the electrode assembly is disposed within the housing.
  10. A battery module comprising a plurality of batteries according to claim 9.
  11. A battery pack comprising a plurality of battery modules according to claim 10.
  12. A device using said battery, comprising a battery according to claim 9, said battery configured to provide electrical energy.
  13. A step of providing at least one positive plate and at least one negative plate, wherein the sum of the number of all positive plates and all negative plates is 3 or more; A step of forming a winding structure by winding at least one positive plate and at least one negative plate on a winding axis, wherein in the winding structure, the positive plate of the at least one positive plate and the negative plate of the at least one negative plate are arranged in an overlapping manner along a direction perpendicular to the winding axis; each of the at least one positive plate includes a positive body portion, and at least a portion of the overlapping surface area of the positive body portion is a positive active material region, and each of the at least one negative plate includes a negative body portion, and at least a portion of the overlapping surface area of the negative body portion is a negative active material region, and both ends along the winding axis of the negative active material region extend beyond the corresponding end of the adjacent positive active material region; If the number of at least one positive plate is 2 or more, the position of the first winding initial end of the positive plate is arranged staggered in the circumferential direction of the winding structure and/or; if the number of at least one negative plate is 2 or more, the position of the second winding initial end of the negative plate is arranged staggered in the circumferential direction of the winding structure; In other radial directions of the above winding structure, the difference in the total number of layers of all positive plates and all negative plates does not exceed the number of preset layers, and A method for manufacturing an electrode assembly characterized in that the number of the above-mentioned preset layers is less than or equal to the sum of the number of all positive plates and all negative plates.
  14. An electrode plate arrangement mechanism configured to provide at least one positive plate and at least one negative plate, wherein the sum of the number of all positive plates and all positive plates is 3 or more; and A winding mechanism configured to form a winding structure by winding the at least one positive plate and the at least one negative plate around a winding axis; In the above winding structure, the anode plates of the plurality of anode plates and the cathode plates among the plurality of cathode plates are alternately arranged along a direction perpendicular to the winding axis, each anode plate includes an anode body portion, and at least a portion of the region along the winding axis of the anode body portion is an anode active material region, each cathode plate includes a cathode body portion, and at least a portion of the region along the winding axis of the cathode body portion is a cathode active material region, and both ends along the winding axis of the cathode active material region extend beyond the corresponding ends of the adjacent anode active material region; If the number of at least one positive plate is 2 or more, the position of the first winding initial end of the positive plate is arranged staggered in the circumferential direction of the winding structure and/or; if the number of at least one negative plate is 2 or more, the position of the second winding initial end of the negative plate is arranged staggered in the circumferential direction of the winding structure; In other radial directions of the above winding structure, the difference in the total number of layers of all positive plates and all negative plates does not exceed the number of preset layers, and An electrode assembly manufacturing apparatus characterized in that the number of the above-mentioned preset layers is less than or equal to the sum of the number of all positive plates and all negative plates.
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Description

Electrode assembly and related battery, device, manufacturing method and manufacturing device The application relates to the field of batteries, and in particular to electrode assemblies and related batteries, devices, manufacturing methods, and manufacturing devices. Due to advantages such as small size, high energy density, high power density, multi-cycle capability, and long storage time, lithium-ion batteries are widely used in some electronic equipment, electric transportation tools, electric toys, and electric devices. For example, lithium-ion batteries are widely used in mobile phones, laptop computers, battery cars, electric vehicles, electric aircraft, electric ships, electric toy cars, electric toy aircraft, and electric tools. With the continuous advancement of lithium-ion battery technology, higher demands on the performance of lithium-ion batteries are being proposed. As lithium-ion batteries are expected to become smaller, lighter, and store more energy, the energy density of lithium-ion batteries must be continuously improved. Currently, there are various methods to improve the energy density of lithium-ion batteries. For example, the energy density can be improved through the structure, for instance, by improving the ratio of positive and negative active materials. Another method to improve the energy density is to reduce the thickness of the diaphragm. As another example, the energy density of the lithium-ion battery can be improved through materials, for instance, by selecting different positive and negative active materials. As yet another example, the energy density can be improved by adjusting the amount of electrolyte; for instance, by reducing the amount of electrolyte to effectively improve the energy density. As yet another example, the energy density of the lithium-ion battery can also be improved by improving the charge cutoff voltage. However, even if the above-mentioned methods for improving the energy density of lithium-ion batteries are adopted, some problems will still exist. For example, there may be specific issues regarding cost, process, or safety. The drawings described herein provide for a further understanding of the present application and constitute part of the present application. Embodiments of the invention and descriptions thereof are used to describe the present application rather than to constitute an inappropriate limitation to the present application. FIG. 1 is a schematic diagram of one embodiment of a vehicle employing the battery of the present invention. FIG. 2 is a structural schematic diagram of one embodiment of the battery pack of the present invention. FIG. 3 is a structural schematic diagram of one embodiment of the battery module of the present invention. FIG. 4 is an exploded view of one embodiment of the battery of the present invention. FIG. 5 is a side view of one embodiment of the electrode assembly of the present invention after it has been flattened. FIG. 6 is a structural schematic diagram of one embodiment of the positive plate in the electrode assembly of the present invention. FIG. 7 is a structural schematic diagram of one embodiment of a cathode plate in an electrode assembly of the present invention. FIG. 8 is a side view of an embodiment in which the positive plate and the negative plate are alternately arranged in the electrode assembly of the present invention. Figure 9 is an enlarged view of part B of Figure 8. FIG. 10 is a structural schematic diagram of one embodiment in which the positive and negative tabs of the present invention are arranged at the same end of the main body along the winding axis. FIG. 11 is a structural schematic diagram of one embodiment in which the positive and negative tabs of the present invention are arranged at different ends of the main body along the winding axis. FIGS. 12, 13, 14, 15, and 16 are cross-sectional views of the first, second, third, fourth, and fifth embodiments of the flat electrode assembly of the present invention in a plane perpendicular to the winding axis, respectively. FIGS. 17, 18, 19 and 20 are cross-sectional views of the first, second, third, and fourth embodiments of the cylindrical electrode assembly of the present invention in a plane perpendicular to the winding axis. FIG. 21 is a flowchart of one embodiment of the method for manufacturing an electrode assembly of the present application. FIG. 22 is a structural schematic diagram of one embodiment of the electrode assembly manufacturing device of the present application. In order to clarify the purpose, technical solution, and advantages of the embodiments of the present invention, a clear and complete description of the technical solutions of the embodiments of the present invention will be provided below, together with the accompanying drawings. Of course, this is merely one embodiment of the present invention, and not all embodiments of the present invention are limited thereto. Based on the embodiments of the present