CN-122025727-A - Method for manufacturing electric storage unit and electric storage unit

Abstract

The invention provides a method for manufacturing an electric storage unit and the electric storage unit. The method for manufacturing the power storage unit includes a bending step of bending the sheet member, and a disposing step of disposing the inner surface of the bent conductive layer on the insulating support layer. The bending step includes bringing an inner surface of the insulating support layer into contact with the inner portion, bringing an outer surface of the insulating support layer into contact with the outer portion, and bringing an end of the insulating support layer into opposition to the connecting portion.

Inventors

• Koh Masaya
• Shimura Yousuke
• Nakaka Satoshi
• KENICHI KAKISHITA
• Chihara Masashi
• AWANO HIROKI
• SATO KEISUKE
• NAGANO YASUAKI

Assignees

• 丰田自动车株式会社
• 丰田电池有限公司

Dates

Publication Date

20260512

Application Date

20251103

Priority Date

20241111

Claims (8)

1. 1. A method for manufacturing an electric storage unit including an electrode sheet, the method comprising: a forming step of forming a sheet member including an electrode foil including a1 st main surface and a2 nd main surface, and an active material layer formed on the 1 st main surface; a bending step of bending the sheet member, and A disposing step of disposing the 2 nd main surface of the electrode foil after bending on an insulating support layer, The bending step is a step of bending the sheet member to form a1 st portion on the electrode foil, a 2 nd portion arranged with the 1 st portion in the thickness direction of the insulating support layer, and a connecting portion connecting the 1 st portion and the 2 nd portion, When the direction intersecting the thickness direction is set as the intersecting direction, Either one of the bending step and the disposing step includes forming the electrode sheet by (i) bringing a 1 st surface of the insulating support layer provided at one end in the thickness direction into contact with the 1 st portion, (ii) bringing a2 nd surface of the insulating support layer on the opposite side from the 1 st surface into contact with the 2 nd portion, and (iii) bringing the end in the intersecting direction of the insulating support layer and the connecting portion into opposition in the intersecting direction.
2. 2. The method for manufacturing an electric storage unit according to claim 1, The forming step includes: a coating step of coating an active material layer on the 1 st main surface, and A pressing step of pressing the active material layer applied to the 1 st main surface, The disposing step is performed after the pressing step.
3. 3. The method for manufacturing an electric storage unit according to claim 1 or 2, The method for manufacturing the electric storage unit further includes a step of bonding the 1 st part to the 1 st surface and bonding the 2 nd part to the 2 nd surface.
4. 4. An electricity storage unit is provided with: Collector plate, and An electrode body including an electrode sheet connected to the collector plate, The electrode sheet includes an insulating support layer, an electrode foil, and an active material layer formed on the electrode foil, The active material layer is disposed on the opposite side of the electrode foil from the insulating support layer, The electrode foil has a 1 st part and a2 nd part arranged in a thickness direction of the insulating support layer, and a connecting part connecting the 1 st part and the 2 nd part, The 1 st part is arranged on the 1 st surface of the insulating supporting layer which is arranged at one end of the thickness direction, The 2 nd portion is disposed on a2 nd surface of the insulating support layer on a side opposite to the 1 st surface, When the direction intersecting the thickness direction is set as the intersecting direction, The connection portion is opposed to an end portion of the insulating support layer on the 1 st direction side in the crossing direction with a gap therebetween in the crossing direction.
5. 5. The power storage unit according to claim 4, The electrode foil comprises an electrode surface arranged on the opposite side of the insulating support layer, The active material layer is coated on the surface of the electrode and has a 1 st active material part coated on the 1 st part and a2 nd active material part coated on the 2 nd part, When the opposite side of the 1 st direction in the crossing direction is set to the 2 nd direction, The 1 st part has a1 st protruding part protruding toward the 2 nd direction side in the crossing direction than the 1 st active material part, The 2 nd portion has a 2 nd protruding portion protruding toward the 2 nd direction side in the intersecting direction than the 2 nd active material portion, At least one of the 1 st protruding portion and the 2 nd protruding portion is connected to the current collecting plate.
6. 6. The power storage unit according to claim 5, An uncoated portion, to which the active material layer is not coated, is formed at the connection portion.
7. 7. The power storage unit according to claim 6, An insulating layer is formed on the uncoated portion.
8. 8. The electricity storage unit according to any one of claims 5 to 7, The active material layer includes a bent portion coated on the bent portion of the electrode foil, The curved portion coating portion has an active material surface provided on the opposite side of the electrode foil, At least one of a hole and a notch is formed on the surface of the active material.

Description

Method for manufacturing electric storage unit and electric storage unit Technical Field The present disclosure relates to a method of manufacturing an electric storage unit and an electric storage unit. Background Japanese patent application laid-open No. 2020-198290 discloses an electric storage unit including a composite current collector including an organic support layer and a conductive layer provided on the organic support layer. Japanese patent application laid-open publication 2020-198290 discloses an example in which the 1 st surface and the 2 nd surface, which are arranged in the thickness direction of the organic support layer, are each provided with a conductive layer. The case where the conductive layers provided on the 1 st and 2 nd surfaces are formed by physical vapor deposition (growth) method (vapor deposition method, sputtering method, or the like) is exemplified. Disclosure of Invention In the above-mentioned japanese patent application laid-open No. 2020-198290, as described above, conductive layers (electrode foils) are formed on the 1 st and 2 nd surfaces of the organic support layer (insulating support layer) by a physical vapor deposition method, respectively. In the case of forming the conductive layer by the physical vapor deposition method, the conductive layer needs to be grown for a long time, and therefore, it is considered that the time taken for manufacturing the electrode sheet becomes long. It is desirable to efficiently manufacture electrode sheets having electrode foils formed on both surfaces of an insulating support layer in this manner. The present disclosure has been made to solve the above-described problems, and an object thereof is to provide a method for manufacturing an electric storage unit and an electric storage unit capable of efficiently manufacturing electrode sheets each having electrode foils provided on both surfaces of an insulating support layer. The method for manufacturing an electric storage unit according to claim 1 of the present disclosure is a method for manufacturing an electric storage unit including an electrode sheet, and includes a forming step of forming a sheet member including an electrode foil including a 1 st main surface and a2 nd main surface, and an active material layer formed on the 1 st main surface, a bending step of bending the sheet member, and a disposing step of disposing the 2 nd main surface of the bent electrode foil on an insulating support layer. The bending step is a step of bending the sheet member to form a 1 st portion on the electrode foil, a2 nd portion arranged with the 1 st portion in the thickness direction of the insulating support layer, and a connecting portion connecting the 1 st portion and the 2 nd portion. When the direction intersecting the thickness direction is the intersecting direction, either the bending step or the disposing step includes forming the electrode sheet by (i) bringing the 1 st surface of the insulating support layer provided at one end in the thickness direction into contact with the 1 st portion, (ii) bringing the 2 nd surface of the insulating support layer on the opposite side from the 1 st surface into contact with the 2 nd portion, and (iii) bringing the end of the insulating support layer in the intersecting direction and the connecting portion into opposition in the intersecting direction. The power storage unit according to claim 2 of the present disclosure includes a collector plate and an electrode body including an electrode sheet connected to the collector plate. The electrode sheet includes an insulating support layer, an electrode foil, and an active material layer formed on the electrode foil. The active material layer is disposed on the opposite side of the insulating support layer from the electrode foil. The electrode foil has a 1 st portion and a 2 nd portion arranged in the thickness direction of the insulating support layer, and a connecting portion connecting the 1 st portion and the 2 nd portion. The 1 st portion is disposed on the 1 st surface of the insulating support layer, which is disposed at one end in the thickness direction. The 2 nd portion is disposed on the 2 nd surface of the insulating support layer on the opposite side of the 1 st surface. When the direction intersecting the thickness direction is the intersecting direction, the connecting portion and the end portion on the 1 st direction side of the intersecting direction in the insulating support layer face each other in the intersecting direction with a gap. The above and other objects, features, aspects and advantages of the present invention will become apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings. Drawings Fig. 1 is a diagram showing a configuration of a vehicle on which an electric storage device is mounted. Fig. 2 is a perspective view showing the structure of the power storage device and the frame memb