US 11,152,673 B2Granted

Secondary battery

AssigneeSanyo Electric Co., Ltd.

InventorsRyoichi Wakimoto, Hiroshi Takabayashi

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Abstract

A positive electrode collector has a part connected to a positive electrode terminal and a part connected to a positive electrode tab. In the positive electrode collector, a fuse portion is provided between the part connected to the positive electrode terminal and the part connected to the positive electrode tab. In the positive electrode collector, a region closer to the part connected to the positive electrode terminal than the fuse portion is referred to as a first region, and a region closer to the part connected to the positive electrode tab than the fuse portion is referred to as a second region. An insulating plate as an insulating member disposed between the positive electrode collector and an electrode body is connected to the second region, and the second region is prevented from moving toward the first region after the fuse portion blows.

Claims12

Dependent claims

A secondary battery comprising:

an electrode body having a positive electrode plate and a negative electrode plate;
an outer casing having an opening and accommodating the electrode body;
a sealing plate sealing the opening;
a terminal attached to the sealing plate;
and
a collector electrically connecting the positive electrode plate or the negative electrode plate to the terminal,
wherein the positive electrode plate or the negative electrode plate has a tab,
wherein the collector has a part connected to the tab and a part connected to the terminal,
wherein, in the collector, a fuse portion is provided between the part connected to the tab and the part connected to the terminal,
wherein an insulating member is disposed between the collector and the electrode body,
wherein a region in the collector closer to the part connected to the terminal than the fuse portion is referred to as a first region,
wherein a region in the collector closer to the part connected to the tab than the fuse portion is referred to as a second region,
wherein the secondary battery has a movement prevention structure that prevents the second region from moving so as to approach at least one of the sealing plate and the first region after the fuse portion blows, and
wherein the movement prevention structure includes the second region and the insulating member.

11 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/209,568Filed 4 Dec 2018
Priority: JP JP2017-23730412 Dec 2017
Published: US 2019/0181417 A113 Jun 2019
Granted: 19 Oct 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification16 codes

H01M 10/0436
Construction or manufacture in general: small-sized flat cells or batteries for portable equipment
H01M 50/103
Characterised by their shape or physical structure: prismatic or rectangular
H01M 50/15
Characterised by their shape: for prismatic or rectangular cells
H01M 50/169
Characterised by the methods of assembling casings with lids: by welding, brazing or soldering