Nonaqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-10511007-B2
Application number	US-201715684415-A
Country	US
Kind code	B2
Filing date	Aug 23, 2017
Priority date	Sep 30, 2016
Publication date	Dec 17, 2019
Grant date	Dec 17, 2019

Abstract

A nonaqueous electrolyte secondary battery including a positive electrode collector electrically connected to a positive electrode plate, a negative electrode collector electrically connected to a negative electrode plate. At least one of the collectors includes a first-side base portion disposed near the sealing plate, and a first-side lead portion connected to one end portion of the first-side base portion and extending towards an electrode body. The first-side lead portion includes a first-side power generating element joining portion joined to a lateral side of the electrode body, and a first-side inclined portion inclined with respect to a thickness direction of the electrode body from the first-side power generating element joining portion towards an outer side in the thickness direction. A total weight of the electrode body and nonaqueous electrolyte contained in the electrode body ranges from 200 g or more to 500 g or less.

First claim

What is claimed is:

1. A nonaqueous electrolyte secondary battery, comprising:
a flat power generating element including
a positive electrode plate,
negative electrode plate, and
a separator that electrically isolates the positive electrode plate and the negative electrode plate from each other;
an outer package, inside of which the power generating element is disposed;
a sealing body that closes an opening of the outer package;
a positive electrode collector electrically connected to the positive electrode plate;
a negative electrode collector electrically connected to the negative electrode plate; and
nonaqueous electrolyte,
wherein at least one of the collectors between the positive electrode collector and the negative electrode collector includes a first-side base portion disposed near the sealing body, and a first-side lead portion disposed so as to be connected to one end portion of the first-side base portion and to extend towards the power generating element,
wherein the first-side lead portion includes a first-side power generating element joining portion joined to a lateral side of the power generating element, and a first-side inclined portion inclined with respect to a thickness direction of the power generating element from the first-side power generating element joining portion towards an outer side in the thickness direction, and
wherein a sum of a weight of the power generating element and a weight of the nonaqueous electrolyte contained in the power generating element is within a range of 200 g or more to 500 g or less, and

a value of d×cos θ is in a range of 4.6 mm or more to 10.8 mm or less,
where θ is, in the one of the collectors, an angle of inclination of the first-side inclined portion with respect to the thickness direction in a case in which the first-side inclined portion is inclined in the thickness direction from a portion facing a lateral surface of the power generating element in the thickness direction, and d is a length of the first-side inclined portion in a longitudinal direction, and
wherein the one of the collectors is a positive electrode collector, and
wherein the positive electrode collector is formed of aluminum or an aluminum alloy, a Young's Modulus is in a range of 65 G Pa or more to 75 G Pa or less, a geometrical moment of inertia of the first-side lead portion is in a range of 1.4×10 −12 m 4 or more to 6.2×10 −12 m 4 or less.

2. The nonaqueous electrolyte secondary battery according to claim 1 ,
wherein the other one of the collectors between the positive electrode collector and the negative electrode collector includes a second-side base portion disposed near the sealing body, and a second-side lead portion disposed so as to be connected to one end portion of the second-side base portion and to extend towards the power generating element, and
wherein the second-side lead portion includes a second-side power generating element joining portion joined to a lateral side of the power generating element, and a second-side inclined portion inclined with respect to the thickness direction of the power generating element from the second-side power generating element joining portion towards the outer side in the thickness direction.

3. The nonaqueous electrolyte secondary battery according to claim 1 ,
wherein the power generating element is a wound electrode body, a cross-section of an end portion of the wound electrode body on a sealing body side has an arc shape,
wherein a thickness of the wound electrode body containing the nonaqueous electrolyte is in a range of 10 mm or more to 30 mm or less, and
wherein a width of the wound electrode body is in a range of 100 mm or more to 200 mm or less.

4. The nonaqueous electrolyte secondary battery according to claim 1 ,
wherein the sealing body includes an injection hole;
the injection hole is sealed with a lid; and
an underside of the lid is closer than an underside of the first-side base portion to the flat power generating element.

5. The nonaqueous electrolyte secondary battery according to claim 2 ,
wherein the first-side base portion comprises the positive electrode collector;
the second-side base portion comprises the negative electrode collector;
a first insulating member is disposed between the sealing body and the first-side base portion;
a second insulating member is disposed between the sealing body and the second-side base portion; and
a height of the first insulating member around the first-side base portion is larger than a height of the second insulating member around the second-side base portion.

6. A nonaqueous electrolyte secondary battery, comprising:
a flat power generating element including
a positive electrode plate,
negative electrode plate, and
a separator that electrically isolates the positive electrode plate and the negative electrode plate from each other;
an outer package, inside of which the power generating element is disposed;
a sealing body that closes an opening of the outer package;
a positive electrode collector electrically connected to the positive electrode plate;
a negative electrode collector electrically connected to the negative electrode plate; and
nonaqueous electrolyte,
wherein at least one of the collectors between the positive electrode collector and the negative electrode collector includes a first-side base portion disposed near the sealing body, and a first-side lead portion disposed so as to be connected to one end portion of the first-side base portion and to extend towards the power generating element,
wherein the first-side lead portion includes a first-side power generating element joining portion joined to a lateral side of the power generating element, and a first-side inclined portion inclined with respect to a thickness direction of the power generating element from the first-side power generating element joining portion towards an outer side in the thickness direction, and
wherein a sum of a weight of the power generating element and a weight of the nonaqueous electrolyte contained in the power generating element is within a range of 200 g or more to 500 g or less, and

wherein the one of the collectors is a positive electrode collector, and
wherein the positive electrode collector is formed of aluminum or an aluminum alloy, a Young's Modulus is in a range of 65 G Pa or more to 75 G Pa or less, a geometrical moment of inertia of the first-side lead portion is in a range of 1.4×10 −12 m 4 or more to 6.2×10 −12 m 4 or less.

7. The nonaqueous electrolyte secondary battery according to claim 6 ,
wherein the other one of the collectors between the positive electrode collector and the negative electrode collector includes a second-side base portion disposed near the sealing body, and a second-side lead portion disposed so as to be connected to one end portion of the second-side base portion and to extend towards the power generating element, and
wherein the second-side lead portion includes a second-side power generating element joining portion joined to a lateral side of the power generating element, and a second-side inclined portion inclined with respect to the thickness direction of the power generating element from the second-side power generating element joining portion towards the outer side in the thickness direction.

8. The nonaqueous electrolyte secondary battery according to claim 6 ,
wherein the power generating element is a wound electrode body, a cross-section of an end portion of the wound electrode body on a sealing body side has an arc shape,
wherein a thickness of the wound electrode body containing the nonaqueous electrolyte is in a range of 10 mm or more to 30 mm or less, and
wherein a width of the wound electrode body is in a

Assignees

• Sanyo Electric Co

Inventors

• Muraoka Masashi
• Arai Tomoharu
• Okado Tetsuya
• Tode Shingo
• Fujihara Toyoki

Classifications

• H01M10/0587 Primary

  of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators · CPC title

• H01M4/661 Primary

  Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence) · CPC title

• H01M10/0431

  Cells with wound or folded electrodes (H01M10/045 takes precedence) · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title