Secondary battery

Patent metadata

Field	Value
Publication number	US-12519188-B2
Application number	US-202318471529-A
Country	US
Kind code	B2
Filing date	Sep 21, 2023
Priority date	Sep 11, 2020
Publication date	Jan 6, 2026
Grant date	Jan 6, 2026

Abstract

A secondary battery includes a positive electrode, a negative electrode, a single positive electrode terminal formed in a flat plate shape, a single negative electrode terminal formed in a flat plate shape, a holder holding the single positive and negative electrode terminals, and a laminate exterior body. The single positive and negative electrode terminals each have a single protruding portion protruding from the laminate exterior body in one direction. An insulating plate is arranged between main side surfaces of the single protruding portions of the terminals. On one side of the insulating plate in a facing direction, only the single protruding portion of the positive terminal protrudes from the laminate exterior body, and on the other side of the insulating plate in the facing direction, only the single protruding portion of the negative terminal protrudes from the laminate exterior body.

First claim

What is claimed is:

1 . A secondary battery comprising:
a positive electrode; a negative electrode; a fixing portion that fixes the positive and negative electrodes; a positive electrode current collector provided at one end of the positive electrode in a first direction; a negative electrode current collector provided at one end of the negative electrode in the first direction; a single positive electrode terminal connected to the positive electrode current collector and formed in a flat plate shape; a single negative electrode terminal connected to the negative electrode current collector and formed in a flat plate shape; a holder that holds the single positive electrode terminal and the single negative electrode terminal and is fixed to the fixing portion; a laminate exterior body provided around the positive electrode, the negative electrode, the fixing portion, the positive electrode current collector and the negative electrode current collector; and an insulating plate that insulates between the single positive electrode terminal and the single negative electrode terminal,
the single positive electrode terminal and the single negative electrode terminal each having a single protruding portion protruding from the laminate exterior body in the first direction, each single protruding portion having a main side surface and a sub side surface having an area smaller than that of the main side surface,
the holder holding the single positive electrode terminal and the single negative electrode terminal so that the main side surface of the single protruding portion of the single positive electrode terminal and the main side surface of the single protruding portion of the single negative electrode terminal face each other, wherein:
the single protruding portion of the single positive electrode terminal protrudes from the holder in the first direction, and an inner portion of the single positive electrode terminal protrudes from the holder in a second direction opposite the first direction and is connected to the positive electrode current collector,
the single protruding portion of the single negative electrode terminal protrudes from the holder in the first direction, and an inner portion of the single negative electrode terminal protrudes from the holder in the second direction and is connected to the negative electrode current collector, and
the insulating plate protrudes from the holder in the first direction and does not protrude from the holder in the second direction,

the insulating plate arranged between the main side surface of the single protruding portion of the single positive electrode terminal and the main side surface of the single protruding portion of the single negative electrode terminal,
the laminate exterior body being in continuous contact with a perimeter of the holder,
wherein, on one side of the insulating plate in a facing direction in which the single positive electrode terminal and the single negative electrode terminal face each other, only the single protruding portion of the single positive electrode terminal protrudes from the laminate exterior body, and on the other side of the insulating plate in the facing direction, only the single protruding portion of the single negative electrode terminal protrudes from the laminate exterior body.

2 . The secondary battery according to claim 1 , wherein
the positive electrode current collector and the negative electrode current collector are spaced apart from each other in a perpendicular direction orthogonal to both the facing direction and the first direction, the inner portion of each of the single positive electrode terminal and the single negative electrode terminal is disposed in the laminate exterior body, the inner portion of the single positive electrode terminal overlaps the negative electrode current collector in the facing direction, and the inner portion of the single negative electrode terminal overlaps the positive electrode current collector in the facing direction.

3 . The secondary battery according to claim 1 , wherein
the holder has an inner surface that faces the positive electrode and the negative electrode, and the inner portion of each of the single positive electrode terminal and the single negative electrode terminal protrudes from the inner surface of the holder in the second direction toward the positive and negative electrodes.

4 . The secondary battery according to claim 1 , wherein
the fixing portion has a positioning portion formed at a position outside of the positive electrode current collector and the negative electrode current collector in a perpendicular direction orthogonal to both the facing direction and the first direction and overlapping the positive electrode current collector and the negative electrode current collector in the perpendicular direction, and the holder has an attached portion attached to the positioning portion.

Assignees

• Toyota Motor Co Ltd

Inventors

• Sasaki Tatsuhiko
• Matsushita Taro
• Watanabe Kenta
• Ishikawa Shotaro
• Kishi Koichiro

Classifications

• H01M50/474

  characterised by their position inside the cells · CPC title

• H01M50/477

  characterised by their shape · CPC title

• H01M50/584

  for preventing incorrect connections inside or outside the batteries · CPC title

• H01M50/528

  Fixed electrical connections, i.e. not intended for disconnection · CPC title

• H01M50/557

  Plate-shaped terminals · CPC title