Secondary cell and battery pack
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United States of America Patent
Stats
-
Aug 23, 2022
Grant Date -
Jul 2, 2020
app pub date -
Dec 6, 2019
filing date -
Dec 27, 2018
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A negative electrode terminal includes a flange, and a connection portion disposed on a first surface of the flange. The connection portion is inserted into a terminal attachment hole. The negative electrode terminal includes a first area made of aluminium or an aluminium alloy, and a second area made of copper or a copper alloy. In the flange, the second area is disposed adjacent to the first surface, and the first area is disposed adjacent to the second surface. A boundary between the first area and the second area is disposed between the first surface and the second surface. A thinnest portion of the first area of the flange in the thickness direction of the flange has a thickness of larger than or equal to 0.3 mm. An external electroconductive member made of aluminium or an aluminium alloy is welded to the flange to form a welded portion.
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