CN-122000304-A - Method for manufacturing electrode body

Abstract

The present invention addresses the problem of providing a technique for manufacturing an electrode body having a free shape. A method for manufacturing an electrode body, comprising the steps of forming a mixture of active material particles and at least fibrillatable binder into a sheet by calendaring, thereby producing a long electrode composite sheet, and cutting an electrode composite sheet having a predetermined contour shape from the long electrode composite sheet.

Inventors

• IKEDA TAKENORI

Assignees

• 丰田自动车株式会社

Dates

Publication Date

20260508

Application Date

20251028

Priority Date

20241101

Claims (5)

1. 1. A method for manufacturing an electrode body, characterized by comprising the steps of: Forming a mixture of active material particles and at least fibrillatable binder into a sheet by calendaring to produce a long-sized electrode composite sheet, and An electrode composite sheet having a prescribed contour shape is cut out from the long-sized electrode composite sheet.
2. 2. The method of manufacturing an electrode body according to claim 1, further comprising a step of attaching an electrode composite sheet having the predetermined contour shape to a current collector.
3. 3. The method for manufacturing an electrode body according to claim 1, wherein, The cutting step includes a step of irradiating the long electrode composite sheet with laser light along the predetermined contour shape.
4. 4. The method of manufacturing an electrode body according to claim 3, further comprising a step of attaching the long electrode composite sheet to a transparent film, In the step of irradiating laser light, the long electrode composite sheet on the film is irradiated with the laser light.
5. 5. The method for manufacturing an electrode body according to claim 1, wherein, The remaining part of the long electrode composite sheet remaining after the cutting step is reused in the step of manufacturing the long electrode composite sheet in the manufacture of other electrode bodies to be carried out later.

Description

Method for manufacturing electrode body Technical Field The technology disclosed in the present specification relates to a method for manufacturing an electrode body. Background Patent document 1 describes a method for manufacturing an electrode body. The method includes a step of applying a solution of an electrode composite material containing active material particles to a current collector. In this step, two or more dies having different coating ranges are used. These two or more dies are operated at different timings to apply the solution of the electrode composite material to the current collector in a range of non-rectangular shapes. Thus, a non-rectangular electrode body can be manufactured. Patent document 1 International publication No. 2018/180019 Disclosure of Invention In the above-described manufacturing method, the shape of the solution that can be applied to the electrode composite material is limited to a combination of rectangular shapes. That is, even if an electrode of a non-rectangular shape can be manufactured, its shape is defined as a combination of rectangular shapes. For example, the shape of the battery can be freely designed according to the space in which the battery is disposed, and therefore, a technique capable of manufacturing an electrode body having a free shape is required. In view of the above-described practical circumstances, the present specification provides a technique for manufacturing an electrode body of a free shape. The technology disclosed in the present specification is embodied in a method of manufacturing an electrode body. In the mode 1, the production method includes a step of forming a mixture of active material particles and at least a fibrillatable binder into a sheet by rolling to produce a long electrode composite sheet, and a step of cutting an electrode composite sheet having a predetermined contour shape from the long electrode composite sheet. In the above-described manufacturing method, first, a long-sized electrode composite sheet is manufactured from the mixture. Then, an electrode composite sheet having a predetermined contour shape is cut out from the long electrode composite sheet. According to this structure, the electrode body having a free shape can be manufactured. In claim 2, in the above 1, the method further comprises a step of attaching an electrode composite sheet having a predetermined contour shape to the current collector. According to this structure, the electrode body having the electrode composite sheet on the current collector can be manufactured in a free shape. In claim 3, in the above 1 or 2, the cutting step may include a step of irradiating the long electrode composite sheet with laser light along a predetermined contour shape. Since the irradiation position of the laser light can be changed relatively easily, according to the above-described structure, the electrode body of a free shape can be manufactured relatively easily. In the 4 th aspect, the method of manufacturing the electrode composite sheet according to any one of the 1 st to 3 rd aspects may further include a step of attaching the long electrode composite sheet to a transparent film. In this case, in the step of irradiating the laser beam, the long electrode composite sheet on the film may be irradiated with the laser beam. For example, when a long electrode composite sheet on a current collector is irradiated with laser light, the long electrode composite sheet may be cut, and the current collector may be degraded. In this regard, the laser light may transmit through the film. Therefore, when the long electrode composite sheet on the film is irradiated with laser light, only the long electrode composite sheet is cut. Since the film is not burned by the laser light, contamination of the electrode composite sheet due to the burning of the film can be avoided. Then, by attaching the electrode composite sheet cut into a predetermined contour shape to the current collector, a high-quality electrode body can be manufactured. In the 5 th aspect, in any one of the 1 st to 4 th aspects, the remaining part of the long-sized electrode composite sheet remaining after the cutting step may be reused in the step of manufacturing the long-sized electrode composite sheet in the manufacturing of another electrode body to be performed later. With this structure, the amount of waste during manufacturing can be reduced. Drawings Fig. 1 is a diagram schematically showing the structure of an electrode body 10 according to an embodiment. Fig. 2 is a flowchart for explaining an embodiment of the manufacturing method of the electrode body 10. Fig. 3 is a diagram for explaining a process of producing a long-sized electrode composite sheet 22 by forming the mixture 20 into a sheet shape by calendaring using a calendaring apparatus 100. Fig. 4 is a diagram for explaining a process of cutting an electrode composite sheet 14 having a predetermined contour shape from a long electrode com