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Patent Searching and Data


Title:
SECONDARY BATTERY, BATTERY PACK, ELECTRIC VEHICLE, ENERGY STORAGE SYSTEM, ELECTRIC TOOL AND ELECTRONIC DEVICE
Document Type and Number:
WIPO Patent Application WO/2020/031432
Kind Code:
A1
Abstract:
This secondary battery is provided with a wound electrode body that comprises a positive electrode, a negative electrode and a separator, while being obtained by winding the positive electrode and the negative electrode, which are superposed on each other with the separator being interposed therebetween, around a winding axis. A cross-section of the wound electrode body, said cross-section being perpendicular to the winding axis, has a flattened shape which is defined by a flat part and a pair of curved parts that face each other with the flat part being interposed therebetween. The negative electrode comprises a negative electrode collector and a negative electrode active material layer that is formed on the negative electrode collector. The ratio of a second distance between two negative electrode collectors adjacent to each other in the outermost turn of the wound electrode body in the flat part to a first distance between two negative electrode collectors adjacent to each other in the innermost turn of the wound electrode body in the flat part is less than 1.

Inventors:
IMOTO RIKAKO (JP)
MATSUI TAKAAKI (JP)
NAKAI HIDEKI (JP)
Application Number:
PCT/JP2019/016147
Publication Date:
February 13, 2020
Filing Date:
April 15, 2019
Export Citation:
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Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
B25F5/00; H01M10/04; B60L50/60; B60L58/10; H01M4/36; H01M4/38; H01M4/587; H01M10/0587; H02J3/32; H02J7/00
Domestic Patent References:
WO2012014422A12012-02-02
Foreign References:
JP2006164956A2006-06-22
JP2016181409A2016-10-13
JP2017111878A2017-06-22
JP2006244834A2006-09-14
Attorney, Agent or Firm:
TSUBASA PATENT PROFESSIONAL CORPORATION (JP)
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