NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

• US 20140045013A1
• Filed: 07/16/2013
• Published: 02/13/2014
• Est. Priority Date: 08/09/2012
• Status: Abandoned Application

• Current Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Minami, Keisuke, Fujihara, Toyoki, Nohma, Toshiyuki
• Application Number:
  US13/943,113
• Publication Number:
  US 20140045013A1
• Time in Patent Office: Days
• US Class Current: 429/94
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 3/04 Cutting off the power supply under fault conditions protective devices and circuit arrangements in general H01H; H02H
• CPC Class Codes: B60L 50/64 Constructional details of batteries specially adapted for electric vehicles
• CPC Class Codes: B60L 58/13 Maintaining the SoC within a determined range
• CPC Class Codes: B60L 58/15 Preventing overcharging
• CPC Class Codes: B60L 58/21 having the same nominal voltage
• CPC Class Codes: H01M 10/0561 the electrolyte being constituted of inorganic materials only
• CPC Class Codes: H01M 10/0568 characterised by the solutes
• CPC Class Codes: H01M 10/0587 of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
• CPC Class Codes: H01M 2220/20 Batteries in motive systems, e.g. vehicle, ship, plane
• 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
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

To provide a non-aqueous electrolyte secondary battery having high capacity and superior safety.

The present invention is a non-aqueous electrolyte secondary including having a wound electrode assembly of a positive electrode, negative electrode and separator housed in an outer can having both a bottom and an opening, the opening being sealed by a sealing plate. This non-aqueous electrolyte secondary battery is characterized in that the battery further comprises a current interrupt device activated by rising pressure inside the battery, the bottom surface of the outer can is parallel to the direction of the winding axis of the wound electrode assembly, the thickness of the negative electrode at a state of charge of 100% is equal to or less than 130% of the thickness of the negative electrode at the time of battery assembly, the maximum width of the wound electrode assembly perpendicular to the winding axis direction during assembly is from 90 to 98% of the distance from the bottom surface of the outer can to the current interrupt device, and the battery capacity of the non-aqueous electrolyte secondary battery is equal to or greater than 4 Ah.

Claims

1. A non-aqueous electrolyte secondary battery including a wound electrode assembly of a positive electrode, negative electrode and separator housed in an outer can having both a bottom and an opening, the opening being sealed by a sealing plate, the non-aqueous electrolyte secondary battery characterized in that the battery further comprises a current interrupt device activated by rising pressure inside the battery, the bottom surface of the outer can is parallel to the direction of the winding axis of the wound electrode assembly, the thickness of the negative electrode at a state of charge of 100% is equal to or less than 130% of the thickness of the negative electrode at the time of battery assembly, the maximum width of the wound electrode assembly perpendicular to the winding axis direction during assembly is from 90 to 98% of the distance from the bottom surface of the outer can to the current interrupt device, and the battery capacity of the non-aqueous electrolyte secondary battery is equal to or greater than 4 Ah.

2. The non-aqueous electrolyte secondary battery according to claim 1, wherein the non-aqueous electrolyte also contains lithium bis(oxalato)borate.

3. The non-aqueous electrolyte secondary battery according to claim 1, wherein the non-aqueous electrolyte also contains lithium difluorophosphate.