US 11,750,002 B2
Battery monitoring apparatus
Masaaki Kitagawa, Kariya (JP); Shun Miyauchi, Kariya (JP); and Takumi Shimizu, Kariya (JP)
Assigned to DENSO CORPORATION, Kariya (JP)
Filed by DENSO CORPORATION, Kariya (JP)
Filed on Jul. 23, 2020, as Appl. No. 16/937,424.
Claims priority of application No. 2019-137925 (JP), filed on Jul. 26, 2019.
Prior Publication US 2021/0028637 A1, Jan. 28, 2021
Int. Cl. H02J 7/00 (2006.01); G01R 31/364 (2019.01); G01R 31/389 (2019.01); G01R 31/396 (2019.01); H01M 10/44 (2006.01); H01M 10/48 (2006.01)
CPC H02J 7/0047 (2013.01) [G01R 31/364 (2019.01); G01R 31/389 (2019.01); G01R 31/396 (2019.01); H01M 10/44 (2013.01); H01M 10/48 (2013.01); H01M 2200/00 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A battery monitoring apparatus for monitoring a state of a storage battery, the storage battery having a positive-electrode-side electric power supply terminal and a negative-electrode-side electric power supply terminal,
the battery monitoring apparatus comprising:
a planar circuit board arranged between the positive-electrode-side and negative-electrode-side electric power supply terminals of the storage battery;
a signal control unit provided in a first electrical path that connects the positive-electrode-side and negative-electrode-side electric power supply terminals of the storage battery, the signal control unit being configured to cause a predetermined AC signal to be outputted from the storage battery through the first electrical path;
a response signal input unit connected with the positive-electrode-side and negative-electrode-side electric power supply terminals of the storage battery respectively via a pair of second electrical paths, the response signal input unit being configured to input, through the pair of second electrical paths, a response signal of the storage battery to the AC signal; and
a microcomputer configured to calculate, based on an acquired current signal and the response signal inputted by the response signal input unit, a complex impedance of the storage battery,
wherein
the first electrical path and the pair of second electrical paths are provided on a major face of the circuit board,
a first region of the circuit board is surrounded by the first electrical path, the pair of second electrical paths and the positive-electrode-side and negative-electrode-side electric power supply terminals of the storage battery, and
a size of the first region is such that an induced electromotive force, which is induced in the pair of second electrical paths by the AC signal flowing through the first electrical path, is within an allowable electromotive-force range which includes zero.