US 11,791,513 B2
Electrochemical cell
Ken Miura, Chiba (JP)
Assigned to SEIKO INSTRUMENTS INC., Chiba (JP)
Filed by Seiko Instruments Inc., Chiba (JP)
Filed on Sep. 8, 2021, as Appl. No. 17/469,081.
Claims priority of application No. 2020-168691 (JP), filed on Oct. 5, 2020.
Prior Publication US 2022/0109206 A1, Apr. 7, 2022
Int. Cl. H01M 50/183 (2021.01); H01M 50/184 (2021.01); H01M 50/171 (2021.01)
CPC H01M 50/184 (2021.01) [H01M 50/171 (2021.01)] 4 Claims
OG exemplary drawing
 
1. An electrochemical cell comprising:
a positive electrode can that is formed into a bottomed cylindrical shape and comprises a bottom portion and a positive electrode can circumferential wall portion extending in a first direction of an axial direction from an outer circumferential edge of the bottom portion;
a negative electrode can that is formed into a topped cylindrical shape, comprises a top portion and a negative electrode can circumferential wall portion extending in a second direction of the axial direction from an outer circumferential edge of the top portion, and is inserted into an inner side of the positive electrode can; and
a gasket that is arranged between the positive electrode can circumferential wall portion and the negative electrode can circumferential wall portion and is pressed to an outer circumferential surface of the negative electrode can by narrowing an opening edge of the positive electrode can,
wherein the negative electrode can circumferential wall portion comprises
a double cylinder portion that extends in the first direction from an opening edge of the negative electrode can toward the top portion, and
a step portion that connects the top portion to the double cylinder portion, the step portion comprises
a first curved portion that extends in a 90° curved manner in the second direction from the outer circumferential edge of the top portion,
a second curved portion that extends in a curved manner from an end edge of the first curved portion in the second direction to an outer side of a radial direction, and
a third curved portion that extends in a curved manner in the second direction from an outer circumferential edge of the second curved portion,
the double cylinder portion comprises
an inner cylinder portion that extends in the second direction from an edge of the third curved portion in the second direction,
an outer cylinder portion that extends in the axial direction along an outer circumferential surface of the inner cylinder portion and surrounds the inner cylinder portion from the outer side of the radial direction, and
a folded portion that is disposed at the opening edge of the negative electrode can and connects the inner cylinder portion to the outer cylinder portion,
the gasket is arranged on at least an outer side of the outer cylinder portion in the radial direction and in the first direction,
an end edge of the outer cylinder portion in the first direction is positioned further in the first direction than a center between both ends of the negative electrode can in the axial direction and is positioned further in the second direction than an end edge of the third curved portion in the first direction, and
the end edge of the outer cylinder portion in the first direction is positioned further in the first direction than an end edge of the inner cylinder portion in the first direction.