PRISMATIC SECONDARY BATTERY AND ASSEMBLED BATTERY USING THE SAME

摘要

An electrode body including a positive electrode plate and a negative electrode plate include a positive electrode tab portion at an end portion on a sealing plate side, a positive electrode collector electrically connected to the positive electrode plate include a collector body portion, a collector extension portion, a collector connection, and a collector connection portion. A pressure-sensitive current breaking mechanism includes a conductive member having an opening portion on an electrode body side, a deformation plate that seals the opening portion, and a collector body portion disposed on the electrode body side of the deformation plate and connected to the deformation plate. The collector extension portion is offset from the collector body portion and is disposed on the sealing plate side with respect to the collector body portion. Positive electrode tab portion is connected to the collector connection bent back at an end portion of the collector extension portion.

主权项

1. A prismatic secondary battery, comprising:
a positive electrode plate that includes a positive electrode tab portion; a negative electrode plate that includes a negative electrode tab portion; an electrode body that includes the positive electrode plate and the negative electrode plate; a prismatic outer package that includes an opening and that houses the electrode body; a sealing plate that seals the opening; a positive electrode terminal electrically connected to the positive electrode plate, the positive electrode terminal being attached to the sealing plate; a negative electrode terminal electrically connected to the negative electrode plate, the negative electrode terminal being attached to the sealing plate; and a pressure-sensitive current breaking mechanism provided in a conductive path between the positive electrode plate and the positive electrode terminal or in a conductive path between the negative electrode plate and the negative electrode terminal, wherein the positive electrode tab portion and the negative electrode tab portion are disposed at an end portion of the electrode body on a sealing plate side, the current breaking mechanism includes a conductive member having m opening portion on an electrode body side, a deformation plate that seals the opening portion, and collector that is connected to the deformation plate, the conductive path between the positive electrode plate and the positive electrode terminal or the conductive path between the negative electrode plate and the negative electrode terminal is disconnected upon breakage of a fragile portion caused by deformation of the deformation plate deforming when a pressure inside the battery is equivalent to or above a predetermined value, the collector includes a collector body portion that is disposed on the electrode body side of the deformation plate and that is connected to the deformation plate, a collector extension portion positioned on the sealing plate side with respect to the collector body portion, and a collector connection that is bent or bent back at an end portion of the collector extension portion, and the positive electrode to portion or the negative electrode tab portion is connected to the collector connection.