Electrode body for use in non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery

• US 10,454,140 B2
• Filed: 12/06/2017
• Issued: 10/22/2019
• Est. Priority Date: 02/05/2010
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Nakano, Tomohiro, Fujita, Hideaki
• Primary Examiner(s): Ridley, Basia A
• Assistant Examiner(s): Chan, Heng M.
• Application Number:
  US15/833,567
• Publication Number:
  US 20180097254A1
• Time in Patent Office: 685 Days
• Field of Search: None
• CPC Class Codes: H01M 10/058 Construction or manufacture
• CPC Class Codes: H01M 4/13 Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
• CPC Class Codes: H01M 50/466 U-shaped, bag-shaped or folded
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

In an electrode body for use in non-aqueous electrolyte secondary battery, a first end of a separator is located more interiorly than one positive electrode end of a positive electrode plate in a width direction, located more exteriorly than one end of a coated positive electrode portion of the positive electrode plate, and located more exteriorly than one end of a coated negative electrode portion of a negative electrode plate. The first end of the separator is thicker than an intermediate portion. A second end of the separator is located more interiorly than an other negative electrode end of the negative electrode plate in the width direction, located more exteriorly than the other end of the coated positive electrode portion of the positive electrode plate, and located more exteriorly than an other end of the coated negative electrode portion of the negative electrode plate. The second end of the separator is thicker than the intermediate portion.

Claims

1. An electrode body for use in non-aqueous electrolyte secondary battery, the electrode body comprising a positive electrode plate, a negative electrode plate and a separator interposed between the positive and negative electrode plates, the positive electrode plate, negative electrode plate and separator overlapping one another with their widths oriented in the same direction,

wherein the positive electrode plate has a positive current collector and a positive electrode mixture layer applied to a surface of the positive current collector;

the negative electrode plate has a negative current collector and a negative electrode mixture layer applied to a surface of the negative current collector;

the separator has a first end located at one end thereof and a second end located at the other end thereof with respect to a width direction and has an intermediate portion located between the first and second ends;

with respect to the width direction, the first separator end is located more interiorly than one positive electrode end which is located at one end of the positive electrode plate with respect to the width direction;

located more exteriorly than one end of a coated positive electrode portion of the positive electrode plate which portion is coated with the positive electrode mixture layer; and

located more exteriorly than one end of a coated negative electrode portion of the negative electrode plate which portion is coated with the negative electrode mixture layer, the first separator end being heat-welded to a portion of the positive electrode plate which portion is opposed to the separator in its thickness direction; and

with respect to the width direction, the second separator end is located more interiorly than an other negative electrode end which is located at an other end of the negative electrode plate with respect to the width direction;

located more exteriorly than an other end of the coated positive electrode portion; and

located more exteriorly than an other end of the coated negative electrode portion, the second separator end being heat-welded to a portion of the negative electrode plate which portion is opposed to the separator in its thickness direction.

2. A non-aqueous electrolyte secondary battery comprising the electrode body for use in non-aqueous electrolyte secondary battery set forth in claim 1.

3. The electrode body for use in non-aqueous electrolyte secondary battery according to claim 1, wherein the portion of the positive electrode plate to which the first separator end is heat-welded is at least a part of an uncoated positive electrode portion of the positive electrode plate which portion is not coated with the positive electrode mixture layer, whereas the portion of the negative electrode plate to which the second separator end is heat-welded is at least a part of an uncoated negative electrode portion of the negative electrode plate which portion is not coated with the negative electrode mixture layer.

4. A non-aqueous electrolyte secondary battery comprising the electrode body for use in non-aqueous electrolyte secondary battery set forth in claim 3.