US 2013/0157095 A1Published application

Secondary battery and method of preparing the same

AssigneeHitachi Vehicle Energy, Ltd.

InventorsToshiyuki Ariga, Takashi Sasaki

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Abstract

A shaft core includes a positive electrode shaft core portion having a positive electrode splaying portion at one end, a negative electrode shaft core portion having a negative electrode splaying portion at the other end, and an insulation portion that mutually insulates and integrates the positive and negative electrode shaft core portions. The positive electrode plate is electrically connected to the positive electrode collector in a state of being splayed through the positive electrode splaying portion, and the negative electrode plate is electrically connected to the negative electrode collector being splayed through the negative electrode splaying portion. The positive and negative electrode shaft core splaying portions press and open their respective electrode laminates at the end surfaces of the wound electrode group, the positive electrode connection piece and the positive electrode collecting portion are welded, and the negative electrode connection piece and the negative electrode collecting portion are also welded.

Claims8

Dependent claims

A secondary battery comprising:

a wound electrode group configured by winding a positive electrode plate and a negative electrode plate through a separator on an outer circumferential portion of a shaft core;
a vessel which accommodates the wound electrode group, has an inside sealed with a lid, and is provided with a positive electrode external terminal and a negative electrode external terminal on an external surface;
a positive electrode collector that electrically connects the positive electrode plate to the positive electrode external terminal;
a negative electrode collector that electrically connects the negative electrode plate to the negative electrode external terminal;
a positive electrode splaying portion and a negative electrode splaying portion that press and splay a laminate of the positive electrode plates and a laminate of the negative electrode plates from inside at both end surfaces of the wound electrode group,
wherein the shaft core includes a positive electrode shaft core portion provided with the positive electrode splaying portion at one end, a negative electrode shaft core portion provided with the negative electrode splaying portion at the other end, and an insulation portion that mutually insulates and integrates the positive electrode shaft core portion and the negative electrode shaft core portion,
the positive electrode plate is electrically connected to the positive electrode collector in a state of being splayed through the positive electrode splaying portion, and the negative electrode plate is electrically connected to the negative electrode collector in a state of being splayed through the negative electrode splaying portion.

4 more elements

A method of preparing a secondary battery, comprising:

a process in which a positive electrode plate and a negative electrode plate are wound through a separator on a circumferential surface of a shaft core so as to form a wound electrode group in a flat shape;
a process in which a positive electrode shaft core portion provided with a pair of protruding positive electrode blades that press and splay the positive electrode plate on an end surface of the wound electrode group from inside to outside and a negative electrode shaft core portion provided with a pair of protruding negative electrode blades that press and splay a negative electrode plate on an end surface of the flat wound electrode group from inside to outside are integrated through an insulation portion so as to prepare the shaft core;
a process in which the pair of positive electrode blades are splayed so as to press and splay the positive electrode plate on the end surface of the wound electrode group from inside to outside, and the pair of negative electrode blades are splayed so as to press and splay the negative electrode plate on the end surface of the wound electrode group from inside to outside;
and
a process in which the pressed-and-splayed positive electrode plate is connected to the positive electrode collector, and the pressed-and-splayed negative electrode plate is connected to the negative electrode collector.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/818,276Filed 29 Sep 2010
Published: 20 Jun 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

H01M 10/0431
Construction or manufacture in general: cells with wound or folded electrodes
H01M 50/533
Electrode connections inside a battery casing: characterised by the shape of the leads or tabs
H01M 50/536
Electrode connections inside a battery casing: characterised by the method of fixing the leads to the electrodes, e.g. by welding
H01M 50/538
Electrode connections inside a battery casing: connection of several leads or tabs of wound or folded electrode stacks

Family

US 8,986,869 B2Related patent
US 2013/0157095 A1This patent

From the US filing history. Foreign family members aren’t listed.

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