Title:
非水電解液二次電池
Document Type and Number:
Japanese Patent JP7153193
Kind Code:
B2
Abstract:
To provide a nonaqueous electrolyte secondary battery capable of preventing deterioration of battery performance in accordance with discharge of a nonaqueous electrolyte from a wound electrode body.SOLUTION: A nonaqueous electrolyte secondary battery includes a wound electrode body 20 having an electrode wound around a winding axis. In a cross section orthogonal to the winding axis, the wound electrode body has two R parts 22a(b) having curved outside surfaces, and an F part 24 sandwiched by both R parts 22a(b), at both ends in the longitudinal direction. Assuming A is a length of a straight line V-V' connecting internal vertices V, V' on the innermost side in the two R parts 22a(b), along a straight line P-P' connecting external curved vertices P, P' of the two R parts 22a(b) separated most from the center. A thickness V-P from the internal vertex V to the external curved vertex P closer to the vertex V is D, A/(A+D) is 0.64-0.92. Here, porosity of a positive electrode active material layer composing the wound electrode body is 10-50 vol%.SELECTED DRAWING: Figure 3
Inventors:
Kunihiko Hayashi
Kenichi Maehara
Kenichi Maehara
Application Number:
JP2018232035A
Publication Date:
October 14, 2022
Filing Date:
December 11, 2018
Export Citation:
Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA
International Classes:
H01M10/0587; H01M4/131; H01M10/0566
Domestic Patent References:
| JP2007157560A | ||||
| JP2009048876A | ||||
| JP2007184261A | ||||
| JP2018085180A | ||||
| JP2005347125A | ||||
| JP2017010878A | ||||
| JP2018032575A |
Foreign References:
| WO2020059131A1 |
Attorney, Agent or Firm:
Makoto Abe
Michiko Oi
Hiroaki Yamane
Michiko Oi
Hiroaki Yamane