Battery and seal unit

Patent metadata

Field	Value
Publication number	US-2016336554-A1
Application number	US-201615223934-A
Country	US
Kind code	A1
Filing date	Jul 29, 2016
Priority date	Jan 29, 2014
Publication date	Nov 17, 2016
Grant date	—

Abstract

A battery disclosed herein includes a container member housing an electrode body and a lead, a gasket, an external terminal, and a restraining member. The container member includes a terminal-connecting part having a thickness of 0.3 mm or less. The terminal-connecting part includes a through hole including a rising part. The gasket includes a hollow shaft inserted into the rising part. The external terminal includes a terminal shaft. The terminal shaft includes a diameter-reduction part. The restraining member restrains at least a part of the diameter-reduction part of the terminal shaft via the diameter-reduction part of the rising part and the shaft of the gasket. The inclination angle of the rising part is larger than the inclination angle of the terminal shaft.

First claim

1 . A battery comprising:
an electrode body; a lead electrically connected to the electrode body; a container member housing the electrode body and the lead and comprising a terminal-connecting part having a thickness of 0.3 mm or less, the terminal-connecting part comprising a through hole and a rising part extending toward an inside of the container member from an edge part of the through hole, and the rising part comprising a diameter-reduction part having a diameter reduced along a direction toward the inside of the container member from the edge part of the through hole; a gasket comprising a hollow shaft inserted into the rising part; an external terminal comprising a first end part and a second end part and comprising a terminal shaft extending to an axial direction toward the second end part from the first end part, wherein the terminal shaft passes through the shaft of the gasket, and is electrically connected to the lead, and the terminal shaft comprises a diameter-reduction part having a diameter reduced along the axial direction; and a restraining member restraining at least a part of the diameter-reduction part of the terminal shaft via the diameter-reduction part of the rising part and the shaft of the gasket, wherein an inclination angle of the diameter-reduction part of the rising part to the axial direction is larger than an inclination angle of the diameter-reduction part of the terminal shaft to the axial direction.

2 . The battery according to claim 1 ,
wherein a portion sandwiched between the diameter-reduction part of the rising part and the diameter-reduction part of the terminal shaft in the shaft of the gasket comprises a first portion having a maximum thickness and a second portion having a minimum thickness, and the first portion is disposed closer to the edge part of the through hole of the terminal-connecting part than the second portion.

3 . The battery according to claim 1 , wherein the container member is formed from a metal, an alloy, or a laminate of a resin layer and a metal layer and/or an alloy layer.

4 . The battery according to claim 1 ,
wherein the lead further comprises a through hole, and the terminal shaft of the external terminal is fitted into the through hole of the lead.

5 . The battery according to claim 1 ,
wherein the external terminal further comprises a through hole, the lead further comprises a projection part, and the projection part of the lead is fitted into the through hole of the external terminal.

6 . The battery according to claim 1 , wherein the lead serves as the restraining member.

7 . The battery according to claim 1 ,
wherein the gasket further comprises a portion mounted on a surface of the terminal-connecting part of the container member, the gasket comprises a main surface and a mounted surface as a back of the main surface, the mounted surface is in contact with the edge part of the through hole of the terminal-connecting part, and the shaft of the gasket extends inside the container member from the mounted surface of the gasket, the first end part of the external terminal comprises a portion mounted on the main surface of the gasket, the portion of the external terminal comprises an end face and a mounted surface as a back of the end face, and the mounted surface is in contact with the main surface of the gasket, the external terminal further comprises a projection projected from the mounted surface, the gasket comprises a recessed part formed in the main surface, and the recessed part corresponds to the projection of the external terminal, and the projection of the external terminal is fitted into the recessed part of the gasket.

8 . The battery according to claim 1 ,
wherein the diameter-reduction part of the external terminal comprises a peripheral surface on which a step part is formed, and the step part of the diameter reduction part is in contact with an inner surface of the shaft of the gasket.

9 . A seal unit comprising:
a seal member comprising a first surface and a second surface as a back of the first surface, wherein the seal member comprises a rising part comprising a tip projected from the second surface, and a through hole passing through the seal member from the first surface to the tip of the rising part, and the through hole comprises a taper part having a diameter that reduces with increasing proximity to the tip of the rising part; a gasket comprising a through hole; and a terminal comprising a first end part and a second end part, wherein the terminal comprises a main part extending to an axial direction toward the second end part from the first end part, and the main part comprises a diameter-reduction part between the first end part and the second end part, the diameter-reduction part having a diameter that reduces with increasing proximity to the second end part, wherein at least a part of the gasket is located in the taper part of the through hole of the seal member, at least a part of the diameter reduction part of the main part of the terminal is located in the through hole of the gasket, the at least a part of the gasket is sandwiched between the taper part of the seal member and the diameter-reduction part of the terminal, and an inclination angle of the taper part of the seal member to the axial direction of the main part of the terminal is larger than an inclination angle of the diameter-reduction part to the axial direction.

10 . The seal unit according to claim 9 ,
wherein the at least a part of the gasket sandwiched between the taper part of the seal member and the diameter-reduction part of the terminal comprises a first portion having a maximum thickness and a second portion having a minimum thickness, and the second portion is disposed closer to the tip of the rising part than the first portion.

11 . The seal unit according to claim 9 , wherein the rising part has a thickness of 0.3 mm or less.

12 . The seal unit according to claim 9 , further comprising:
a restraining member surrounding the rising part, wherein the rising part is sandwiched between the at least a part of the gasket and the restraining member.

13 . The seal unit according to claim 9 , wherein the seal member is formed from a metal, an alloy, a resin or a laminate of a resin layer and a metal layer and/or an alloy layer.

14 . The seal unit according to claim 9 , further comprising a lead comprising a terminal-connecting part and a through hole passing through the terminal-connecting part,
wherein the terminal-connecting part faces the second surface of the seal member, and the main part of the terminal is fitted into the through hole of the lead.

15 . The seal unit according to claim 9 , further comprising a lead comprising a terminal-connecting part facing the second surface of the seal member and a projection part extending from a surface facing the second surface of the seal member,
wherein the terminal further comprises a recessed part formed in the second end part, or a through hole passing through the terminal from the second end part to the first end part, and the projection part of the terminal-connecting part is fitted into the recessed part or the through hole of the terminal.

16 . The seal unit according to claim 15 ,
wherein the lead further comprises a portion surrounding the rising part of the seal member, and the rising part is sandwiched between the at least a part of the gasket and the lead.

17 . A battery comprising:
a container having an opening; an electrode body housed in the container; and the seal unit according to

Assignees

• Toshiba Kk

Inventors

• Negishi Nobuyasu
• Hashimoto Tatsuya
• Shinoda Tatsuya
• Kawamura Koichi
• Iwamura Naoki

Classifications

• F16J15/10 Primary

  with non-metallic packing · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• F16J15/08

  with exclusively metal packing · CPC title

• F16J15/104

  characterised by structure · CPC title

• H01M50/191

  Inorganic material · CPC title