US 12,293,889 B2
Protective circuit
Yoshihiro Yoneda, Shimotsuke (JP)
Assigned to DEXERIALS CORPORATION, Tochigi (JP)
Appl. No. 17/927,339
Filed by DEXERIALS CORPORATION, Tochigi (JP)
PCT Filed May 27, 2021, PCT No. PCT/JP2021/020192
§ 371(c)(1), (2) Date Nov. 22, 2022,
PCT Pub. No. WO2021/241684, PCT Pub. Date Dec. 2, 2021.
Claims priority of application No. 2020-094274 (JP), filed on May 29, 2020.
Prior Publication US 2023/0207241 A1, Jun. 29, 2023
Int. Cl. H01H 37/76 (2006.01); H01H 85/11 (2006.01); H01M 10/48 (2006.01); H02H 3/20 (2006.01); H02H 7/18 (2006.01); H01M 10/44 (2006.01); H02J 7/00 (2006.01)
CPC H01H 37/76 (2013.01) [H01H 85/11 (2013.01); H01M 10/48 (2013.01); H02H 3/20 (2013.01); H02H 7/18 (2013.01); H01M 10/44 (2013.01); H02J 7/0013 (2013.01); H02J 7/00308 (2020.01)] 12 Claims
OG exemplary drawing
 
1. A protective circuit comprising:
a protective element that has a first terminal, a second terminal, a first fusible conductor of which both ends are connected to the first terminal and the second terminal, a third terminal, a fourth terminal, and a heat generator installed on a first energizing path between the third terminal and the fourth terminal;
a plurality of secondary battery cells connected in series;
an external positive electrode terminal and an external negative electrode terminal;
an auxiliary power supply provided electrically independently of the plurality of secondary battery cells;
a control device that detects vehicle abnormalities from a vehicle engine control apparatus while monitoring abnormal voltages of the plurality of secondary battery cells, and outputs a signal when the control device detects at least one of (1) one or more abnormal voltages of the plurality of secondary battery cells or (2) one or more vehicle abnormalities from the vehicle engine control apparatus; and
a switch that receives the signal from the control device and switches energization, wherein the control device outputs a signal to the switch when the vehicle engine control apparatus detects one or more vehicle abnormalities other than the one or more abnormal voltages of the plurality of secondary battery cells, wherein the control device is connected to the plurality of secondary battery cells and/or the vehicle engine control apparatus, wherein the first terminal and the second terminal of the protective element are installed on a second energizing path between a positive electrode end of the plurality of secondary battery cells and the external positive electrode terminal or between a negative electrode end of the plurality of secondary battery cells and the external negative electrode terminal, wherein the third terminal and the fourth terminal of the protective element are connected with the auxiliary power supply and the switch in series and in a loop, and wherein the switch is switched to energization by the signal from the control device, the heat generator of the protective element generates heat, and the first fusible conductor is fused to cut off a portion between the plurality of secondary battery cells and the external positive electrode terminal or a portion between the plurality of secondary battery cells and the external negative electrode terminal from each other.