JP-7856047-B2 - Method for manufacturing electrodes

Inventors

• 池田 裕介
• 加藤 和仁
• 後藤 孝章
• 芳賀 正宜
• 船戸 峰洋
• 金子 剛
• 横井 友香

Assignees

• トヨタ自動車株式会社

Dates

Publication Date

20260511

Application Date

20230518

Claims (1)

1. A method for manufacturing an electrode body in which a positive electrode and a negative electrode are arranged side by side with a separator in between, The process of preparing the separator, The steps include: arranging a plurality of positive electrodes on the separator; The steps include: forming a folded portion for positioning the positive electrode relative to the separator by folding the separator back, and arranging the separator on the plurality of positive electrodes; A step of arranging a plurality of negative electrodes on a separator arranged on a plurality of positive electrodes, The steps include: forming a folded portion for positioning the negative electrode relative to the separator by folding the separator back, and arranging the separator on the plurality of negative electrodes; The process includes the step of forming a plurality of electrode bodies by cutting the separator at a position passing through the plurality of positive electrodes and the plurality of negative electrodes , In the step of arranging the plurality of positive electrodes, the plurality of positive electrodes are arranged in an orthogonal direction that is perpendicular to both the direction connecting the folded portions and the thickness direction of the positive electrodes. A method for manufacturing an electrode body , wherein in the step of arranging the plurality of negative electrodes, the plurality of negative electrodes are arranged so as to be aligned in the orthogonal direction .

Description

This disclosure relates to a method for manufacturing an electrode body. Japanese Patent Publication No. 2021-57217 discloses a method for manufacturing an electrode assembly, which includes the steps of: manufacturing a unit by welding a pair of separator sheets together with multiple electrodes arranged between them, thereby forming a welded portion between the multiple electrodes; manufacturing a laminated unit by stacking multiple such units; and manufacturing multiple electrode assemblies by cutting the laminated unit at the welded portion. Japanese Patent Publication No. 2021-57217 This is a schematic perspective view of an energy storage cell in one embodiment of the present disclosure.Figure 1 is a cross-sectional view of the energy storage cell.This diagram schematically shows the manufacturing method of the electrode body.This diagram schematically shows the manufacturing method of the electrode body.This diagram schematically shows the manufacturing method of the electrode body.This diagram schematically shows the manufacturing method of the electrode body. Embodiments of this disclosure will be described with reference to the drawings. In the drawings referenced below, identical or equivalent components are given the same number. Figure 1 is a schematic perspective view of an energy storage cell in one embodiment of this disclosure. Figure 2 is a cross-sectional view of the energy storage cell shown in Figure 1. As shown in Figures 1 and 2, the energy storage cell 1 comprises an electrode body 100, a cell case 200, a pair of external terminals 300, a pair of connecting members 400, and an insulating member 500. The electrode body 100 comprises a plurality of electrodes 110, 120 (see Figure 6, etc.) and a separator 130. The multiple electrodes 110 and 120 are arranged in a unidirectional direction (a direction perpendicular to the plane of the paper in Figure 2). Each of the multiple electrodes 110 and 120 comprises multiple positive electrodes 110 and multiple negative electrodes 120. Each positive electrode 110 is formed in a rectangular shape that is elongated in the width direction (a direction perpendicular to both the unidirectional and vertical directions). Each positive electrode 110 has a positive electrode current collector foil and positive electrode active material layers provided on both sides of the positive electrode current collector foil. As shown in Figure 2, the positive electrode current collector foil has a positive electrode tab 112p that does not have a positive electrode active material layer. The positive electrode tab 112p protrudes toward one side in the width direction. Each negative electrode 120 is formed in a rectangular shape that is elongated in the width direction. Each negative electrode 120 has a negative electrode current collector foil and a negative electrode active material layer provided on both sides of the negative electrode current collector foil. As shown in Figure 2, the negative electrode current collector foil has a negative electrode tab 122n that does not have a negative electrode active material layer. The negative electrode tab 122n protrudes toward the other side in the width direction. The separator 130 insulates the positive electrode 110 and the negative electrode 120. The separator 130 is made of an insulating material and has minute voids that allow ion permeability. The separator 130 may be formed in a zigzag pattern. That is, the separator 130 may be arranged between the electrodes 110 and 120 in a zigzag pattern. The cell case 200 houses the electrode body 100. The cell case 200 contains an electrolyte solution (not shown). The cell case 200 is sealed. The cell case 200 has a case body 210 and a lid 220. The case body 210 has an opening that opens upward. The case body 210 is made of a metal such as aluminum. As shown in Figure 2, the case body 210 has a bottom wall 212 and a peripheral wall 214. The bottom wall 212 is formed in a rectangular and flat shape. The peripheral wall 214 rises from the bottom wall 212. The peripheral wall 214 is formed in a rectangular tubular shape. The length of the peripheral wall 214 in the width direction is longer than the length of the peripheral wall 214 in the thickness direction. The length of the peripheral wall 214 in the height direction is longer than the length of the peripheral wall 214 in the thickness direction. The lid 220 closes the opening of the case body 210. The lid 220 is connected to the opening by welding or other means. The lid 220 is formed in a flat plate shape. The lid 220 is made of a metal such as aluminum. The lid 220 includes a pressure relief valve 222 and a sealing member 224. The pressure relief valve 222 is formed in the center of the lid 220. The pressure relief valve 222 is designed to rupture when the internal pressure of the cell case 200 exceeds a predetermined pressure. When the pressure relief valve 222 ruptures, the gas inside the cell case 200 is released outsid