Bipolar secondary battery

Patent metadata

Field	Value
Publication number	US-11075397-B2
Application number	US-201816611900-A
Country	US
Kind code	B2
Filing date	Apr 26, 2018
Priority date	May 10, 2017
Publication date	Jul 27, 2021
Grant date	Jul 27, 2021

Abstract

The bipolar secondary battery includes a power generation element including unit power generation elements stacked together and including bipolar electrodes stacked via separators, and current collecting plates arranged at both ends of the power generation element in the stacked direction of the unit power generation elements so as to be in contact with the power generation element, wherein the current collecting plates each include an electrically conductive layer and a resin film, the electrically conductive layer being formed on the resin film having a thermal shrinkage percentage of 2% or greater at a temperature of 150° C., and the separators have a higher thermal shrinkage start temperature than the resin films.

First claim

The invention claimed is:

1. A bipolar secondary battery including bipolar electrodes, the bipolar secondary battery comprising:
a power generation element including unit power generation elements stacked together and including the bipolar electrodes stacked via separators; and
current collecting plates arranged only on both of outermost layers of the power generation element in a stacked direction of the unit power generation elements so as to be in contact with the power generation element; and
an exterior body housing the power generation element,
each of the current collecting plates including an electrically conductive layer and a resin film, the electrically conductive layer being formed on the resin film having a thermal shrinkage percentage of 2% or greater at a temperature of 150° C.,
each of the separators having a higher thermal shrinkage start temperature than the resin film, and
each of the current collecting plates being led out of the exterior body.

2. The bipolar secondary battery according to claim 1 , wherein the electrically conductive layer formed on the resin film is a metal layer.

3. The bipolar secondary battery according to claim 1 , wherein a sheet resistance of the respective current collecting plates including the electrically conductive layer formed on the resin film is 0.1 Ω/sq or less.

4. The bipolar secondary battery according to claim 1 , wherein the bipolar electrodes are each provided with a positive electrode on one surface of a resin current collector, and a negative electrode on another surface opposite to the one surface.

5. The bipolar secondary battery according to claim 1 , wherein the resin film of each of the current collecting plates is led out of the exterior body.

Assignees

• Nissan Motor

Inventors

• Kano Gentaro
• Arihara Kazuki
• Horai Atsushi
• Minegishi Eiji
• Mori Takashi
• Emori Yusuke
• Nakashima Yusuke

Classifications

• H01M50/443

  Particulate material · CPC title

• H01M50/534

  characterised by the material of the leads or tabs · CPC title

• H01M50/489

  Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties · CPC title

• H01M4/667

  in the form of layers, e.g. coatings · CPC title

• H01M2004/029

  Bipolar electrodes · CPC title