Prismatic secondary battery, assembled battery using the same and method of producing the same

Patent metadata

Field	Value
Publication number	US-2016336545-A1
Application number	US-201615153032-A
Country	US
Kind code	A1
Filing date	May 12, 2016
Priority date	May 15, 2015
Publication date	Nov 17, 2016
Grant date	—

Abstract

An electrode body including positive electrode plate and negative electrode plate includes a positive electrode tab portion at an end portion on the sealing plate side. The positive electrode plate is electrically connected to a positive electrode collector including a collector body portion and a collector connection. A pressure-sensitive current breaking mechanism includes a conductive member including an opening portion on an electrode body side, a deformation plate that seals the opening portion, and a collector body portion that is disposed on the electrode body side of the deformation plate and that is connected to the deformation plate. The collector connection is disposed between the current breaking mechanism and one of the large-area side walls of the prismatic outer package, and the positive electrode tab portion is connected to the collector connection.

First claim

What is claimed is:

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 collector electrically connected to the positive electrode plate or the negative electrode plate; a prismatic outer package that includes an opening, a bottom, a pair of large-area side walls and a pair of small-area side walls, the prismatic outer package housing the electrode body; a sealing plate that seals the opening, a positive electrode terminal electrically connected to the positive electrode plate, the positive electrode plate 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 collector includes a collector body portion and a collector connection, the 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 the collector body portion that is disposed on the electrode body side of the deformation plate and that is connected to the deformation plate, the collector connection is disposed between the current breaking mechanism and the large-area side walls, the positive electrode tab portion or the negative electrode tab portion is connected to the collector connection, and 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.

2 . The prismatic secondary battery according to claim 1 , wherein
the collector connection extends towards the sealing plate side from an end portion of the collector body portion.

3 . The prismatic secondary battery according to claim 1 , wherein
the fragile portion is formed in the collector body portion and around a connection between the collector body portion and the deformation plate.

4 . The prismatic secondary battery according to any one of claim 1 , wherein
the collector includes a first collector connection and a second collector connection that serve as the collector connection, the first collector connection is disposed between one of the pair of large-area side walls and the current breaking mechanism, and the second collector connection is disposed between the other one of the pair of large-area side walls and the current breaking mechanism.

5 . The prismatic secondary battery according to any one of claim 1 , wherein
an angle of the collector connection against the collector body portion is 225° to 300°.

6 . The prismatic secondary battery according to any one of claim 1 , further comprising:
a receiving component, wherein the positive electrode tab portion or the negative electrode tab portion is connected to the collector connection while held between the collector connection and the receiving component.

7 . An assembled battery comprising:
a plurality of the prismatic secondary batteries according to any one of claim 1 .

8 . A method for manufacturing a prismatic secondary battery including 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 collector electrically connected to the positive electrode plate or the negative electrode plate, a prismatic outer package that includes an opening, a bottom, a pair of large-area side walls and a pair of small-area side walls, the prismatic outer package housing the electrode body, a sealing plate that seals the opening, a positive electrode terminal electrically connected to the positive electrode plate, the positive electrode plate being installed in the sealing plate, a negative electrode terminal electrically connected to the negative electrode plate, the negative electrode terminal being installed in the sealing plate, 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, in which 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 collector includes a collector body portion and a collector connection, the 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 the collector body portion that is disposed on the electrode body side of the deformation plate and that is connected to the deformation plate, the collector connection is disposed between the current breaking mechanism and the large-area side walls, the positive electrode tab portion or the negative electrode tab portion is connected to the collector connection, and 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 method comprising:
a tab-connection step of connecting the collector connection to the positive electrode tab portion or the negative electrode tab portion; and a bending step of bending the collector connection with respect to the collector body portion after the tab-connection step.

Assignees

• Sanyo Electric Co
• Panasonic Corp

Inventors

• Wakimoto Ryoichi
• Kitaoka Kazuhiro
• Fujiwara Isao
• Yagi Hiromasa

Classifications

• H01M2200/20

  Pressure-sensitive devices · CPC title

• H01M50/536

  characterised by the method of fixing the leads to the electrodes, e.g. by welding · CPC title

• H01M50/54

  Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges · CPC title

• H01M2/025 Primary

  Electricity · mapped topic

• H01M2/345

  Electricity · mapped topic