Granted Patent B2

US 12,278,401 · App. 17/042,298 · Granted Apr 15, 2025

Inventors: Natsuhiko Mukai (Osaka, JP); Satoshi Yamamoto (Osaka, JP); Masaki Deguchi (Hyogo, JP); Taisuke Yamamoto (Nara, JP); Atsushi Ueda (Osaka, JP); Masanobu Takeuchi (Osaka, JP)

Assignees: PANASONIC ENERGY CO., LTD.; PANASONIC HOLDINGS CORPORATION

H01M50/593H01M10/0422H01M10/0587H01M50/107H01M50/533H01M50/534H01M50/536H01M50/545H01M50/595H01M50/186H01M50/193

Abstract

Claims (20)

1. A non-aqueous electrolyte secondary battery comprising:

a spiral-type electrode body in which a positive electrode and a negative electrode are wound with a separator located therebetween;

a bottomed cylindrical outer can that holds therein the electrode body; and

a sealing body that closes off an opening of the outer can and that functions as a positive electrode terminal, wherein

the electrode body has a positive electrode lead which has a first end portion being one lengthwise end of the positive electrode lead, and a second end portion located toward a side opposite to the first end portion, the second end portion being the other lengthwise end of the positive electrode lead;

the positive electrode lead comprises:

only a single lead base member made of metal and having a first surface joined to the positive electrode, and a second surface located on an opposite side of the first surface; and

an insulating ceramic layer composed only of an insulating inorganic compound or comprising the inorganic compound and a binder which binds particles of the inorganic compound wherein a content of the binder is from 1 to 10% by mass relative to the mass of the inorganic compound, the ceramic layer being formed directly on the second surface of the single lead base member in at least an area facing the negative electrode via the separator,

the ceramic layer is formed over the entire area facing the negative electrode via the separator, and additionally in the first end portion on the second surface of the single lead base member, wherein the ceramic layer in the first end portion is formed only within a range of 3 mm from a first end; and

the single lead base material includes, on the second surface thereof a region which is sandwiched between the ceramic layer formed in the first end portion and the area facing the negative electrode via the separator, and is not covered by the ceramic layer, the region being a region where a welded portion which is welded to the sealing body is formed.

2. The non-aqueous electrolyte secondary battery according to claim 1 , further comprising

an upper insulation plate disposed between the sealing body and an electrode group constituted of the positive electrode, the negative electrode, and the separator, the upper insulation plate having an insertion hole for the positive electrode lead.

3. The non-aqueous electrolyte secondary battery according to claim 1 , wherein

the negative electrode comprises a negative electrode core and a negative electrode mixture layer formed on the negative electrode core;

an exposed core portion in which a surface of the negative electrode core is exposed is provided on an outermost peripheral surface of the electrode body; and

the exposed core portion is in contact with an inner peripheral surface of the outer can.

4. The non-aqueous electrolyte secondary battery according to claim 1 , wherein the positive electrode lead has attached thereto an insulation tape that covers the ceramic layer.

5. The non-aqueous electrolyte secondary battery according to claim 1 , wherein:

the positive electrode includes a positive electrode core, a positive electrode mixture layer formed on the positive electrode core, and an exposed core portion which is provided only toward one end in a width direction of the positive electrode core and surrounded on three sides by the positive electrode mixture layer; and

the positive electrode lead is joined to the exposed core portion.

Assignments (3)

Priority Claims (1)

Continuity (1)

References Cited (33)