Energy storage device and method of manufacturing energy storage device

Patent metadata

Field	Value
Publication number	US-9960406-B2
Application number	US-201514732692-A
Country	US
Kind code	B2
Filing date	Jun 6, 2015
Priority date	Jun 9, 2014
Publication date	May 1, 2018
Grant date	May 1, 2018

Abstract

An energy storage device includes: a first guide portion which is arranged in the inside of a case and allows an electrolyte solution to flow toward one end of an electrode assembly in a winding axis direction from an electrolyte solution pouring hole; and a second guide portion which is arranged in the inside of the case and allows a fluid to flow toward the electrolyte solution pouring hole from the inside of the case, and which prevents the electrolyte solution from flowing toward the other end of the electrode assembly in the winding axis direction from the electrolyte solution pouring hole or suppresses the electrolyte solution from flowing toward the other end of the electrode assembly in the winding axis direction from the electrolyte solution pouring hole.

First claim

What is claimed is:

1. An energy storage device, comprising:
an electrode assembly formed by winding electrodes and a separator in a layered state;
a case for storing the electrode assembly therein, the case comprising an electrolyte solution sealing portion where an electrolyte solution pouring hole formed in the case is sealed;
a first guide portion which is arranged in an inside of the case and allows an electrolyte solution to flow toward one end of the electrode assembly in a winding axis direction from the electrolyte solution pouring hole; and
a second guide portion which is arranged in the inside of the case and allows a fluid to flow toward the electrolyte solution pouring hole from the inside of the case, and which prevents the electrolyte solution from flowing toward an other end of the electrode assembly in the winding axis direction from the electrolyte solution pouring hole or suppresses the electrolyte solution from flowing toward the other end of the electrode assembly in the winding axis direction from the electrolyte solution pouring hole,
wherein the case includes a wall which is substantially parallel to the winding axis direction, the electrolyte solution pouring hole is formed on the wall, and the first guide portion and the second guide portion are arranged between the wall and the electrode assembly,
wherein, between the wall and the electrode assembly, the electrolyte solution flows through the first guide portion in a same direction as a direction that the fluid flows through the second guide portion.

2. The energy storage device according to claim 1 , wherein the case further comprises a discharge sealing portion where a discharge hole formed in the case is sealed, and
wherein, in the winding axis direction, the discharge hole is formed at a position closer to the other end of the electrode assembly than the electrolyte solution pouring hole.

3. The energy storage device according to claim 2 , wherein the discharge hole is formed at a position where a fluid which passes the second guide portion is allowed to be discharged to an outside of the case, the position being closer to the second guide portion than the electrolyte solution pouring hole is, and
wherein the electrolyte solution pouring hole is formed at a position closer to the first guide portion than the discharge hole is.

4. The energy storage device according to claim 1 , wherein the first guide portion comprises a check valve which allows the fluid to flow toward the one end of the electrode assembly from the electrolyte solution pouring hole, and prevents the fluid from flowing toward the electrolyte solution pouring hole from the inside of the case.

5. The energy storage device according to claim 1 , wherein the second guide portion comprises a check valve which allows the fluid to flow toward the electrolyte solution pouring hole from the inside of the case, and prevents the fluid from flowing toward the other end of the electrode assembly through the electrolyte solution pouring hole.

6. The energy storage device according to claim 1 , wherein the second guide portion includes a mesh member which is arranged so as to intersect with a flow passage of the fluid flowing toward the electrolyte solution pouring hole from the inside of the case.

7. The energy storage device according to claim 1 , wherein the first guide portion and the second guide portion are formed into an integral body.

8. The energy storage device according to claim 1 , wherein the winding axis direction extends in a longitudinal direction of an extension of the electrode assembly.

9. The energy storage device according to claim 1 , wherein, between the wall and the electrode assembly, the second guide portion prevents the fluid to flow in a direction opposite to the direction that the electrolyte solution flows through the first guide portion.

10. An energy storage device, comprising:
an electrode assembly formed by winding electrodes and a separator in a layered state;
a case for storing the electrode assembly therein, the case comprising an electrolyte solution sealing portion where an electrolyte solution pouring hole formed in the case is sealed;
a first guide portion which is arranged in an inside of the case and allows an electrolyte solution to flow toward one end of the electrode assembly in a winding axis direction from the electrolyte solution pouring hole; and
a second guide portion which is arranged in the inside of the case and allows a fluid to flow toward the electrolyte solution pouring hole from the inside of the case, and which prevents the electrolyte solution from flowing toward an other end of the electrode assembly in the winding axis direction from the electrolyte solution pouring hole or suppresses the electrolyte solution from flowing toward the other end of the electrode assembly in the winding axis direction from the electrolyte solution pouring hole,
wherein the case includes a wall which is substantially parallel to the winding axis direction, the electrolyte solution pouring hole is formed on the wall, and the first guide portion and the second guide portion are arranged between the wall and the electrode assembly,
wherein the first guide portion comprises a first flow control portion that pivots away from the wall to pass the electrolyte solution through the first guide portion, and
wherein the second guide portion comprises a second flow control portion that, in a same direction that the first flow control portion pivots away from the wall, pivots away from the wall to pass the fluid through the second guide portion.

11. A method of manufacturing an energy storage device which includes an electrode assembly formed by winding electrodes and a separator in a layered state, and a case for storing the electrode assembly therein, the case comprising an electrolyte solution sealing portion where an electrolyte solution pouring hole formed in the case is sealed, wherein the method comprises:
pouring an electrolyte solution in the case through the electrolyte solution pouring hole which is in a non-sealed state, the case being provided with:
a first guide portion which is arranged in an inside of the case and allows an electrolyte solution to flow toward one end of the electrode assembly in a winding axis direction from the electrolyte solution pouring hole; and
a second guide portion which is arranged in the inside of the case and allows a fluid to flow toward the electrolyte solution pouring hole from the inside of the case, and which prevents the electrolyte solution from flowing toward an other end of the electrode assembly in the winding axis direction from the electrolyte solution pouring hole or suppresses the electrolyte solution from flow toward the other end of the electrode assembly in the winding axis direction from the electrolyte solution pouring hole,

wherein the case includes a wall which is substantially parallel to the winding axis direction, the electrolyte solution pouring hole is formed on the wall, and the first guide portion and the second guide portion are arranged between the wall and the electrode assembly, and
wherein, between the wall and the electrode assembly, the electrolyte solution flows through the first guide portion in a same direction as a direction that the fluid flows through the second guide portion.

12. The method of manufacturing the energy storage device according to claim 11 , wherein
the case includes a discharge sealing portion where a discharge hole formed in the case is sealed,
the discharge hole is formed at a position closer to the other end of the electrode assembly than the electrolyte solution pouring hole is in the winding axis

Assignees

• Gs Yuasa Int Ltd

Inventors

• Yamafuku Taro
• Kawaguchi Kazuki
• Masuda Masaki
• Takano Masashi

Classifications

• H01G11/78 Primary

  Cases; Housings; Encapsulations; Mountings · 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

• H01M2/36 Primary

  Electricity · mapped topic