Bipolar Storage Battery, Method For Manufacturing Bipolar Storage Battery, And Bipolar Lead-Acid Storage Battery

Patent metadata

Field	Value
Publication number	US-2024250312-A1
Application number	US-202318482514-A
Country	US
Kind code	A1
Filing date	Oct 6, 2023
Priority date	Apr 8, 2021
Publication date	Jul 25, 2024
Grant date	—

Abstract

In a bipolar storage battery where a positive electrode current collector plate and a negative electrode current collector plate are electrically connected in a through-hole of a substrate and a plurality of cell members are electrically connected in series, even when an electrolytic solution moves between the current collector plate and the substrate, the electrolytic solution is prevented from easily reaching the through-hole of the substrate, preventing a short circuit. At least one of a bottom surface of a recess that is a surface of a main substrate close to a positive electrode or a bottom surface of a recess that is a surface of the main substrate close to a negative electrode, the main substrate being a substrate arranged between cell members, has a ten-point average roughness (RzJIS) of between 30 μm and 104 μm, inclusive, and a maximum height roughness (Rz) of 123 μm or less.

First claim

What is claimed is:

1 . A bipolar storage battery, comprising:
a plurality of cell members each including a positive electrode including a positive electrode current collector plate and a positive active material layer, a negative electrode including a negative electrode current collector plate and a negative active material layer, and a separator interposed between the positive electrode and the negative electrode, the plurality of cell members being arranged in a stack manner with intervals; and a plurality of space forming members, each space forming member forming a plurality of spaces for individually housing the plurality of cell members, wherein each space forming member includes a substrate formed of a synthetic resin that covers at least one of a side of the positive electrode or a side of the negative electrode of a cell member and a frame body that surrounds a side surface of the cell member, the plurality of cell members and the substrate of each space forming member are arranged to be alternately stacked, and frame bodies adjacent to each other are joined to each other, at least one of a surface of a main substrate close to the positive electrode and a surface of the main substrate close to the negative electrode, the main substrate being the substrate arranged between the cell members adjacent to each other, has a ten-point average roughness (RzJIS) of 30 μm or more and 104 μm or less when measured in accordance with a stipulation of “Annex JA of JIS B 0601:2013”, and a maximum height roughness (Rz) of 123 μm or less when measured in accordance with the stipulation, the positive electrode current collector plate formed of a metal is fixed to the surface of the main substrate close to the positive electrode with an adhesive, the negative electrode current collector plate formed of a metal is fixed to the surface of the main substrate close to the negative electrode with an adhesive, and the main substrate has a through-hole extending in a direction intersecting with a plate surface, the positive electrode current collector plate and the negative electrode current collector plate of adjacent cell members are electrically connected to each other in the through-hole, and the plurality of cell members are electrically connected in series.

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

3 . A method for manufacturing a bipolar storage battery, wherein the bipolar storage battery includes:
a plurality of cell members each including a positive electrode including a positive electrode current collector plate and a positive active material layer, a negative electrode including a negative electrode current collector plate and a negative active material layer, and a separator interposed between the positive electrode and the negative electrode, the plurality of cell members being arranged in a stack manner with intervals; and a plurality of space forming members, each space forming member forming a plurality of spaces for individually housing the plurality of cell members, each space forming member includes a substrate formed of a synthetic resin that covers at least one of a side of the positive electrode or a side of the negative electrode of a cell member, and a frame body that surrounds a side surface of the cell member, the plurality of cell members and the substrate of each space forming member are arranged to be alternately stacked, frame bodies adjacent to each other are joined to each other, the positive electrode current collector plate formed of a metal is fixed to a surface of a main substrate close to the positive electrode with an adhesive, the main substrate being a substrate arranged between the cell members adjacent to each other, the negative electrode current collector plate formed of a metal is fixed to a surface of the main substrate close to the negative electrode with an adhesive, the main substrate has a through-hole extending in a direction intersecting with a plate surface, the positive electrode current collector plate and the negative electrode current collector plate of the cell members adjacent to each other are electrically connected to each other in the through-hole, and the plurality of cell members are electrically connected in series, and as the main substrate, a main substrate, in which at least one of the surface of the main substrate close to the positive electrode or the surface of the main substrate close to the negative electrode has a ten-point average roughness (RzJIS) of 30 μm or more and 104 μm or less when measured in accordance with a stipulation of “Annex JA of JIS B 0601:2013”, and a maximum height roughness (Rz) of 123 μm or less when measured in accordance with the stipulation, is used.

4 . A bipolar lead-acid storage battery, comprising:
a plurality of cell members each including a positive electrode in which a positive active material layer is arranged on one surface of a positive electrode lead foil formed of lead or a lead alloy, a negative electrode in which a negative active material layer is arranged on one surface of a negative electrode lead foil formed of lead or a lead alloy, and a separator interposed between the positive electrode and the negative electrode, the plurality of cell members being arranged in a stack manner with intervals; and a plurality of space forming members, each space forming member forming a plurality of spaces for individually housing the plurality of cell members, wherein each space forming member includes a substrate that covers at least one of a side of the positive electrode or a side of the negative electrode of a cell member and a frame body that surrounds a side surface of the cell member, the plurality of cell members and the substrate of each space forming member are arranged to be alternately stacked, and frame bodies adjacent to each other are joined to each other, the positive electrode lead foil and the negative electrode lead foil each have a portion having a granular structure, at least one of an interface of the positive electrode lead foil with the positive active material layer or an interface of the negative electrode lead foil with the negative active material layer has a portion formed in the granular structure, and has a ten-point average roughness (RzJIS) of 50 μm or more when measured in accordance with a stipulation of “Annex JA of JIS B 0601:2013”, and a maximum height roughness (Rz) smaller than ½ of a mean particle size of particles constituting the granular structure when measured in accordance with the stipulation, and the substrate arranged between the cell members adjacent to each other adjacent cell members has a through-hole extending in a direction intersecting with a plate surface, the positive electrode lead foil and the negative electrode lead foil of the adjacent cell members are electrically connected to each other in the through-hole, and the plurality of cell members are electrically connected in series.

Assignees

• Furukawa Battery Co Ltd
• Furukawa Electric Co Ltd

Inventors

• Koide Ayano

Classifications

• H01M10/0486

  Frames for plates or membranes · CPC title

• H01M10/0418

  with bipolar electrodes · CPC title

• H01M4/685

  Lead alloys · CPC title

• H01M10/12

  Construction or manufacture · CPC title

• H01M50/477

  characterised by their shape · CPC title