US 10,256,508 B2Granted

Non-aqueous electrolyte secondary battery

AssigneeSanyo Electric Co., Ltd.

InventorEiji Okutani

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Abstract

The invention aims to allow carbon dioxide, which is generated upon decomposition of lithium carbonate contained in a positive electrode mixture layer, to easily flow toward the outside of a flat wound electrode body, and further aims to rapidly raise the pressure inside a battery and to reliably operate a pressure-sensitive current interrupt mechanism before the temperature inside the battery rises to such an extent as causing an abnormal state, e.g., smoking, firing, or a burst. A nonaqueous electrolyte secondary battery (10) according to one embodiment of the present invention includes a pressure-sensitive current interrupt mechanism. An insulating tape (11b) is bonded onto a positive electrode mixture layer (11a) in at least one of a winding start-side edge portion and a winding end-side edge portion of a positive electrode plate (11) in a flat wound electrode body (14) at a position opposing to a separator (13), the insulating tape extending in a widthwise direction of the positive electrode mixture layer (11a).

Claims20

Dependent claims

A nonaqueous electrolyte secondary battery comprising:

a positive electrode plate including a positive electrode mixture layer formed on a positive electrode core;
a negative electrode plate including a negative electrode mixture layer formed on a negative electrode core;
a flat wound electrode body in which the positive electrode plate and the negative electrode plate are wound into a flat roll shape in a state insulated from each other with a separator interposed between the positive electrode plate and the negative electrode plate;
a nonaqueous electrolyte;
and
an outer casing,
wherein a positive electrode core exposed portion is formed in a form of wound multilayers in one end portion of the flat wound electrode body,
a negative electrode core exposed portion is formed in a form of wound multilayers in the other end portion of the flat wound electrode body,
the wound multilayers of the positive electrode core exposed portion are bundled and connected to a positive electrode current collector,
the wound multilayers of the negative electrode core exposed portion are bundled and connected to a negative electrode current collector,
the nonaqueous electrolyte secondary battery includes a pressure-sensitive current interrupt mechanism electrically connected to at least one of the positive electrode current collector and the negative electrode current collector,
the positive electrode mixture layer contains lithium carbonate,
an insulating tape is bonded onto the positive electrode mixture layer in at least one of a winding start-side edge portion and a winding end-side edge portion of the positive electrode plate at a position opposing to the separator, the insulating tape extending in a widthwise direction of the positive electrode mixture layer, and
a length of the insulating tape extends in a direction of a winding axis around which the flat wound electrode body is wound.

11 more elements

A nonaqueous electrolyte secondary battery comprising:

a positive electrode plate including a positive electrode mixture layer formed on a positive electrode core;
a negative electrode plate including a negative electrode mixture layer formed on a negative electrode core;
a flat wound electrode body in which the positive electrode plate and the negative electrode plate are wound into a flat roll shape in a state insulated from each other with a separator interposed between the positive electrode plate and the negative electrode plate;
a nonaqueous electrolyte;
and
an outer casing,
wherein a positive electrode core exposed portion is formed in a form of wound multilayers in one end portion of the flat wound electrode body,
a negative electrode core exposed portion is formed in a form of wound multilayers in the other end portion of the flat wound electrode body,
the wound multilayers of the positive electrode core exposed portion are bundled and connected to a positive electrode current collector,
the wound multilayers of the negative electrode core exposed portion are bundled and connected to a negative electrode current collector,
the nonaqueous electrolyte secondary battery includes a pressure-sensitive current interrupt mechanism electrically connected to at least one of the positive electrode current collector and the negative electrode current collector,
the positive electrode mixture layer contains lithium carbonate,
an insulating tape is bonded onto the positive electrode mixture layer in at least one of a winding start-side edge portion and a winding end-side edge portion of the positive electrode plate at a position opposing to the separator, the insulating tape extending in a widthwise direction of the positive electrode mixture layer,
the insulating tape includes a first insulating tape and a second insulating tape,
the first insulating tape is bonded to a first surface of the positive electrode plate,
the second insulating tape is bonded to a second surface opposite the first surface of the positive electrode plate,
each of the first insulating tape and the second insulating tape extends outward beyond the at least one of the winding start-side edge portion and the winding end-side edge portion in a winding direction of the flat wound electrode body, and
the first insulating tape and the second insulating tape are bonded together.

15 more elements

A nonaqueous electrolyte secondary battery comprising:

a positive electrode plate including a positive electrode mixture layer formed on a positive electrode core;
a negative electrode plate including a negative electrode mixture layer formed on a negative electrode core;
a flat wound electrode body in which the positive electrode plate and the negative electrode plate are wound into a flat roll shape in a state insulated from each other with a separator interposed between the positive electrode plate and the negative electrode plate;
a nonaqueous electrolyte;
and
an outer casing,
wherein a positive electrode core exposed portion is formed in a form of wound multilayers in one end portion of the flat wound electrode body,
a negative electrode core exposed portion is formed in a form of wound multilayers in the other end portion of the flat wound electrode body,
the wound multilayers of the positive electrode core exposed portion are bundled and connected to a positive electrode current collector,
the wound multilayers of the negative electrode core exposed portion are bundled and connected to a negative electrode current collector,
the nonaqueous electrolyte secondary battery includes a pressure-sensitive forced short-circuiting mechanism,
the positive electrode mixture layer contains lithium carbonate,
an insulating tape is bonded onto the positive electrode mixture layer in at least one of a winding start-side edge portion and a winding end-side edge portion of the positive electrode plate at a position opposing to the separator, the insulating tape extending in a widthwise direction of the positive electrode mixture layer, and
a length of the insulating tape extends in a direction of a winding axis around which the flat wound electrode body is wound.

11 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/900,536Filed 10 Jun 2014
Priority: JP 2013-1379331 Jul 2013
Published: US 2016/0172712 A116 Jun 2016
Granted: 9 Apr 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

H01M 10/0587
Construction or manufacture: of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes…
H01M 4/139
Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof: processes of manufacture
H01M 4/62
Electrodes composed of, or comprising, active material: selection of inactive substances as ingredients for active masses, e.g. binders, fillers
H01M 50/40
Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells:…