Method for manufacturing secondary cell

Patent metadata

Field	Value
Publication number	US-2016254523-A1
Application number	US-201415029540-A
Country	US
Kind code	A1
Filing date	Oct 3, 2014
Priority date	Oct 15, 2013
Publication date	Sep 1, 2016
Grant date	—

Abstract

Provided is a method for manufacturing a secondary cell by which a wound body can be effectively impregnated with an electrolytic solution. The method includes: a step of depressurizing an interior of an outer case 30 ; a step of pouring an electrolytic solution E into the depressurized outer case 30 ; a step of depressurizing the interior of the outer case 30 ; a step of pouring the electrolytic solution E into the depressurized outer case 30 ; a step of impregnating the wound body with the electrolytic solution E from both axial end portions 100 a, 100 b of a wound body 100 ; a step of waiting until a difference in pressure between a wound body external space S, which is a space between the outer case 30 and the wound body, and a wound body internal space S 1 is reduced after the impregnation with the electrolytic solution E; and a step of pressurizing the wound body external space S.

First claim

1 . A method for manufacturing a secondary cell, comprising:
a step of depressurizing an interior of a cell case; a step of pouring an electrolytic solution into the depressurized cell case; a step of impregnating a wound body with the electrolytic solution from both axial end portions of the wound body; a step of increasing the impregnated amount of the electrolytic solution in the both axial end portions of the wound body in order to reduce a difference in pressure between a wound body external space, which is a space between the cell case and the wound body, and a wound body internal space, which is an internal space of the wound body, after the impregnation with the electrolytic solution, and air-tightly sealing the wound body internal space, which is the internal space of the wound body, and the wound body external space, which is the space between the cell case and the wound body, with the impregnated electrolytic solution; and a step of pressurizing the wound body external space, which has been reduced in the difference in pressure.

2 . The method for manufacturing a secondary cell according to claim 1 , further comprising a step of hermetically closing the cell case after the electrolytic solution has been poured.

3 . The method for manufacturing a secondary cell according to claim 2 , comprising
waiting until an equilibrium of pressures in the wound body external space and the wound body internal space is reached in the air-tight sealing step.

4 . The method for manufacturing a secondary cell according to claim 2 , wherein
in the step of pressurizing the wound body external space, the cell case is opened to the atmosphere.

5 . The method for manufacturing a secondary cell according to claim 2 , wherein
in the step of pressurizing the wound body external space, the cell case is pressurized from the outside.

6 . The method for manufacturing a secondary cell according to claim 5 , wherein
a step of expanding the cell case to the outside is performed before the step of depressurizing the interior of the cell case, and in the step of pressurizing the wound body external space, the cell case, which has been expanded to the outside, is pressurized to compress the cell case in a direction opposite to a direction of the expansion.

7 . The method for manufacturing a secondary cell according to claim 6 , wherein
in the step of pressurizing the wound body external space, the cell case is compressed to pressurize the wound body external space to a pressure equal to or higher than the atmospheric pressure.

8 . A method for manufacturing a secondary cell, comprising:
a step of depressurizing an interior of a cell case in a state in which a wound body is housed in the cell case; a step of pouring an electrolytic solution into the cell case; and a step of sealing the cell case, the method further comprising: a step of producing a negative pressure in a wound body internal space, which is an internal space of the wound body, in the step of depressurizing the interior of the cell case, and air-tightly sealing the wound body internal space with respect to a wound body external space, which is a space between the cell case and the wound body, in a state with a negative pressure in the wound body internal space; and a step of opening the inside of the cell case to the atmosphere in a state in which the wound body internal space is air-tightly sealed with respect to the wound body external space, wherein the step of sealing the cell case is performed in a state in which the wound body internal space is air-tightly sealed with respect to the wound body external space and the inside of the cell case is open to the atmosphere.

9 . The method for manufacturing a secondary cell according to claim 8 , wherein
the step of air-tightly sealing the wound body internal space with respect to the wound body external space, which is the space between the cell case and the wound body, in a state of a negative pressure in the wound body internal space is performed by impregnating an end portion of the wound body with the electrolytic solution.

10 . The method for manufacturing a secondary cell according to claim 9 , wherein
the step of air-tightly sealing the wound body internal space with respect to the wound body external space, which is the space between the cell case and the wound body, in a state of a negative pressure in the wound body internal space is performed by impregnating an end portion of the wound body with the electrolytic solution by a capillary effect.

Assignees

• Toyota Motor Co Ltd

Inventors

• Tsukui Akira
• Kado Hiroyasu
• Yamada Nobuhiro
• Minakuchi Akio

Classifications

• H01M10/0431 Primary

  Cells with wound or folded electrodes (H01M10/045 takes precedence) · CPC title

• H01M50/664

  Temporary seals, e.g. for storage of instant batteries or seawater batteries · CPC title

• H01M50/627

  Filling ports · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/0587

  of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators · CPC title