| CPC H01M 4/661 (2013.01) [H01M 50/176 (2021.01); H01M 50/184 (2021.01); H01M 50/186 (2021.01); H01M 50/553 (2021.01); H01M 50/16 (2021.01); H01M 50/191 (2021.01); H01M 50/536 (2021.01); H01M 50/54 (2021.01); H01M 50/55 (2021.01); H01M 50/562 (2021.01); H01M 50/566 (2021.01)] | 10 Claims |
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1. A rectangular secondary battery comprising:
an electrode body that includes a positive electrode plate and a negative electrode plate;
a rectangular casing that has an opening and contains the electrode body;
a sealing plate that seals the opening;
a tab that is provided on the positive electrode plate or the negative electrode plate;
a tab group that is composed of a plurality of the tabs;
a terminal that is electrically connected to the tab group and attached to the sealing plate;
a current collector member that is electrically connected to the tab group and the terminal; and
an insulator,
wherein the insulator includes a base portion that is disposed between the sealing plate and the current collector member and a first wall portion that protrudes from the base portion toward the electrode body,
wherein the tab group is disposed on the sealing plate side of the electrode body,
wherein the tab group is bent and is connected to a region of the current collector member,
wherein, in a transversal direction of the sealing plate, the first wall portion is located nearer than a connection portion between the tab group and the current collector member to the rectangular casing,
wherein the first wall portion is disposed between the tab group and the rectangular casing,
wherein the tab group includes a first connection region disposed on the current collector member and a first bent region that extends from an end portion of the first connection region on the first wall portion side toward the electrode body and that is bent so as to bulge toward the first wall portion,
wherein a surface of the tab group on the rectangular casing side has a first recessed region that is located on the electrode body side of the first bent region and recessed toward a center of the sealing plate in the transversal direction of the sealing plate,
wherein the first wall portion is located between a part of the first bent region nearest to the rectangular casing and the rectangular casing,
wherein the insulator includes a second wall portion that protrudes from the base portion toward the electrode body,
wherein the electrode body includes a first tab group and a second tab group,
wherein the tab group is the first tab group,
wherein the second tab group includes a second connection region disposed on the current collector member and a second bent region that extends from an end portion of the second connection region on the second wall portion side toward the electrode body and that is bent so as to bulge toward the second wall portion,
wherein a surface of the tab group on the rectangular casing side has a second recessed region that is located on the electrode body side of the second bent region and recessed toward the center of the sealing plate in the transversal direction of the sealing plate, and
wherein the second wall portion is located between a part of the second bent region nearest to the rectangular casing and the rectangular casing.
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