Power storage device

Patent metadata

Field	Value
Publication number	US-2023411812-A1
Application number	US-202118037832-A
Country	US
Kind code	A1
Filing date	Nov 19, 2021
Priority date	Nov 24, 2020
Publication date	Dec 21, 2023
Grant date	—

Abstract

A power storage device includes power storage cells that includes a positive electrode, a negative electrode, a separator, and an accommodation chamber accommodating a liquid electrolyte in a liquid-tight manner. The power storage device includes a cell stack in which the power storage cells are stacked in series. A side surface of the cell stack is covered with a seal portion made of a plastic. A terminal positive electrode current collector and a terminal negative electrode current collector located in the outermost layer of the cell stack are made of a high thermal conductivity material having a thermal conductivity greater than or equal to 100 W/(m·K). The power storage device includes a positive electrode cooling unit, which cools the terminal positive electrode current collector, and a negative electrode cooling unit, which cools the terminal negative electrode current collector. The liquid electrolyte contains an ester compound.

First claim

1 . A power storage device, comprising power storage cells, wherein
each power storage cell includes: a positive electrode, in which a positive electrode active material layer is bonded to a first surface of a positive electrode current collector; a negative electrode, in which a negative electrode active material layer is bonded to a first surface of a negative electrode current collector, the negative electrode active material layer being disposed to face the positive electrode active material layer of the positive electrode; a separator disposed between the positive electrode active material layer and the negative electrode active material layer; and an accommodation chamber that is provided between the positive electrode and the negative electrode and accommodates a liquid electrolyte in a liquid-tight manner, wherein the liquid electrolyte is a liquid electrolyte containing an ester compound, the power storage device comprises a cell stack in which the power storage cells are stacked in series, a side surface of the cell stack with respect to a stacking direction is covered with a covering portion made of a plastic, each of the positive electrode current collector and the negative electrode current collector includes a terminal current collector located at an outermost layer of the cell stack, at least one of the terminal current collectors is made of a high thermal conductivity material having a thermal conductivity greater than or equal to 100 W/(m·K), and the power storage device comprises a cooling unit that cools the terminal current collector made of the high thermal conductivity material.

2 . The power storage device according to claim 1 , wherein at least one of the following conditions is met: a weight per unit area of the positive electrode active material layer is greater than or equal to 55 mg/cm 2 , and a weight per unit area of the negative electrode active material layer is greater than or equal to 25 mg/cm 2 .

3 . The power storage device according to claim 1 , wherein the separator is bonded to the positive electrode active material layer and the negative electrode active material layer.

Assignees

• Toyota Jidoshokki Kk

Inventors

• Kondo Yushi
• Ohmori Osamu
• Katayama Takeshi
• Yamashita Yusuke

Classifications

• H01M50/682 Primary

  accommodated in battery or cell casings · CPC title

• H01M10/0569

  characterised by the solvents · CPC title

• H01M10/653

  characterised by electrically insulating or thermally conductive materials · CPC title

• H01M10/613

  Cooling or keeping cold · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title