US 12,230,768 B2
Secondary battery
Tetsuo Hara, Toyota (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Dec. 29, 2023, as Appl. No. 18/399,853.
Application 18/399,853 is a continuation of application No. 18/467,068, filed on Sep. 14, 2023, granted, now 12,107,236.
Application 18/467,068 is a continuation of application No. 17/027,852, filed on Sep. 22, 2020, granted, now 11,799,134, issued on Oct. 24, 2023.
Claims priority of application No. 2019-186940 (JP), filed on Oct. 10, 2019.
Prior Publication US 2024/0136598 A1, Apr. 25, 2024
Prior Publication US 2024/0234830 A9, Jul. 11, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 10/0587 (2010.01); H01M 50/46 (2021.01); H01M 50/538 (2021.01)
CPC H01M 10/0587 (2013.01) [H01M 50/46 (2021.01); H01M 50/538 (2021.01); Y02E 60/10 (2013.01); Y02P 70/50 (2015.11)] 5 Claims
OG exemplary drawing
 
1. A secondary battery, comprising:
a battery case;
an electrode body in which a positive electrode, a negative electrode, and a separator are stacked, with the positive electrode and the negative electrode being insulated from each other by the separator; and
a collector member connected to the battery case and the electrode body, wherein
the positive electrode includes
a positive electrode collector including an active material layer forming region, an insulation layer forming region adjacent to the active material layer forming region, and a collector region adjacent to the insulation layer forming region,
a positive electrode active material layer including a positive electrode active material provided on a surface of the active material layer forming region, and
an insulation layer provided on a surface of the insulation layer forming region,
the collector member includes a first portion, and a second portion continuous to the first portion and bent relative to the first portion,
the first portion is fixed to the battery case,
the second portion is connected, at an end thereof on an opposite side to the bent portion, to the collector region,
the collector member further including a rib integrally formed, at the bent part, with the first portion and the second portion;
wherein the rib has a length that is shorter than a space between a top of the electrode body and the first portion of the collector member, and a width that is half or less than a thickness of the electrode body; and
wherein the battery case is a square battery case including a case main body having an opening, and a lid member for covering the opening,
the first portion is connected to an inner surface of the lid member,
the second portion is bent along any one surface of the case main body surrounding the opening,
a length (LC) of the collector member from the first portion to an extreme end of the end of the collector member and a length (LR) of a dimension of the rib in a direction along the length (LC) satisfy following relationship: LR≥0.1×LC, and
a thickness (TC) of a dimension of the collector member in a direction orthogonal to the one surface of the second portion and a thickness (TR) of a dimension in a direction in parallel with the one surface of the rib satisfy following relationship: TR≥0.4×1/TC.