Bipolar Storage Battery

Patent metadata

Field	Value
Publication number	US-2024021884-A1
Application number	US-202318473907-A
Country	US
Kind code	A1
Filing date	Sep 25, 2023
Priority date	Mar 26, 2021
Publication date	Jan 18, 2024
Grant date	—

Abstract

A bipolar storage battery includes cell members arranged with spacing in a stacked manner, each of the cell members including a positive electrode, a negative electrode, and separators interposed between the positive electrode and the negative electrode, space-forming members including a substrate that forms a plurality of spaces individually accommodating the plurality of cell members, and a frame body surrounding a side surface of the cell member. Each of the plurality of separators has a first surface and a second surface with different surface roughness, and a surface in contact with at least the positive active material layer is a surface having a smaller (finer) surface roughness than the first surface or the second surface. This configuration may suppress local use of active material during charging and discharging to achieve uniform use of active material in a cell.

First claim

What is claimed is:

1 . A bipolar storage battery, comprising:
cell members arranged with spacing in a stacked manner, each of the cell members including a positive electrode including a positive current collector and a positive active material layer, a negative electrode including a negative current collector and a negative active material layer, and separators interposed between the positive electrode and the negative electrode; and space-forming members forming a plurality of spaces individually accommodating the cell members, each of the space-forming members including a substrate and a frame body, the substrate covering at least one of a side of the positive electrode or a side of the negative electrode of the cell member, and the frame body surrounding a side surface of the cell member, wherein each of the separators has a first surface and a second surface with different surface roughness and a surface in contact with at least the positive active material layer is a surface having a finer surface roughness than the first surface or the second surface.

2 . The bipolar storage battery according to claim 1 , wherein the positive current collector and the negative current collector are made of lead or a lead alloy.

3 . The bipolar storage battery according to claim 1 , wherein a value of surface roughness of a surface in contact with the positive active material layer or the negative active material layer is μm or more and 90 μm or less.

4 . The bipolar storage battery according to claim 3 , wherein the positive current collector and the negative current collector are made of lead or a lead alloy.

5 . The bipolar storage battery according to claim 3 , wherein, when stacking the separators, surfaces with a rougher surface roughness of adjacent separators of the separators are arranged to face each other.

6 . The bipolar storage battery according to claim 5 , wherein the positive current collector and the negative current collector are made of lead or a lead alloy.

7 . The bipolar storage battery according to claim 1 , wherein, when stacking the separators, surfaces with a rougher surface roughness of adjacent separators of the separators are arranged to face each other.

8 . The bipolar storage battery according to claim 7 , wherein the positive current collector and the negative current collector are made of lead or a lead alloy.

9 . A bipolar storage battery, comprising:
cell members arranged with spacing in a stacked manner, each of the cell members including a positive electrode including a positive current collector and a positive active material layer, a negative electrode including a negative current collector and a negative active material layer, and separators interposed between the positive electrode and the negative electrode; and space-forming members forming a plurality of spaces individually accommodating the cell members, each of the space-forming members including a substrate and a frame body, the substrate covering at least one of a side of the positive electrode or a side of the negative electrode of the cell member, and the frame body surrounding a side surface of the cell member, wherein each of the separators has a first surface and a second surface with different surface roughness, and surfaces in contact with the positive active material layer and the negative active material layer are each a surface having a finer surface roughness than the first surface or the second surface.

10 . The bipolar storage battery according to claim 9 , wherein the positive current collector and the negative current collector are made of lead or a lead alloy.

11 . The bipolar storage battery according to claim 9 , wherein a value of surface roughness of a surface in contact with the positive active material layer or the negative active material layer is 15 μm or more and 90 μm or less.

12 . The bipolar storage battery according to claim 11 , wherein the positive current collector and the negative current collector are made of lead or a lead alloy.

13 . The bipolar storage battery according to claim 11 , wherein, when stacking the separators, surfaces with a rougher surface roughness of adjacent separators of the separators are arranged to face each other.

14 . The bipolar storage battery according to claim 13 , wherein the positive current collector and the negative current collector are made of lead or a lead alloy.

15 . The bipolar storage battery according to claim 9 , wherein, when stacking the separators, surfaces with a rougher surface roughness of adjacent separators of the separators are arranged to face each other.

16 . The bipolar storage battery according to claim 15 , wherein the positive current collector and the negative current collector are made of lead or a lead alloy.

Assignees

• Furukawa Battery Co Ltd
• Furukawa Electric Co Ltd

Inventors

• Nakakita Naoki
• Yoshida Hideaki
• Shibata Satoshi
• Tainaka Ryo

Classifications

• H01M10/127 Primary

  with bipolar electrodes · CPC title

• H01M10/14 Primary

  Assembling a group of electrodes or separators · CPC title

• H01M4/685

  Lead alloys · CPC title

• H01M4/68

  for use in lead-acid accumulators · CPC title

• H01M50/463

  Separators, membranes or diaphragms characterised by their shape · CPC title