Sealed battery and battery stack comprising a plurality of sealed batteries

摘要

A sealed battery includes a lid closing a container of a sealed battery, an upper current collecting plate, a lead connecting an upper surface to an inner surface of the lid. A welding point of the lead is outside a position corresponding to a periphery of the cap. The lead includes a cylindrical lateral wall part extending vertically, an annular frame portion extending substantially horizontally from a first end of the lateral wall part, and a plurality of supplementary leads that extends substantially horizontally from a second end part of the lateral wall part. The frame portion extends from the first end part in substantially a first direction along a radial direction of the cylindrical lateral wall part, whereas the plurality of supplementary leads extends from the second end part in substantially a second direction opposite to the first direction along the radial direction.

主权项

1. A sealed battery comprising:
a lid which closes a container of said sealed battery and covers an upper part of a center of a bare lid with a cap via a valve body to form a safety valve, an upper current collecting plate with an upper surface, and a lead connecting the upper surface to an inner surface of said lid, wherein a welding point of said lead on the inner surface of said lid is outside of a position corresponding to a periphery of said cap, a length of the lead from said welding point of said lead on the inner surface of said lid to a nearest welding point of said lead on said upper surface of said upper current collecting plate is 1 to 2.1 times as large as a shortest distance from said welding point of said lead on the inner surface of said lid to the upper surface of said upper current collecting plate, and the lead comprises
a cylindrical lateral wall part that extends vertically, the lateral wall part having a first end part and a second end part located oppositely,an annular frame portion that extends substantially horizontally from the first end part, anda plurality of supplementary leads that extends substantially horizontally from the second end part, and the frame portion extends from the first end part in substantially a first direction along a radial direction of the cylindrical lateral wall part, whereas the plurality of supplementary leads extends from the second end part in substantially a second direction along the radial direction, the second direction being opposite to the first direction.