US 12,474,412 B2
Battery monitoring system
Soya Taniguchi, Nisshin (JP); Yoshikazu Furuta, Nisshin (JP); Kazuo Matsukawa, Kariya (JP); and Yoshiyuki Utagawa, Kariya (JP)
Assigned to DENSO CORPORATION, Kariya (JP); TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP); and MIRISE Technologies Corporation, Nisshin (JP)
Filed by DENSO CORPORATION, Kariya (JP); TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP); and MIRISE Technologies Corporation, Nisshin (JP)
Filed on Nov. 16, 2022, as Appl. No. 18/056,058.
Claims priority of application No. 2021-192031 (JP), filed on Nov. 26, 2021.
Prior Publication US 2023/0168311 A1, Jun. 1, 2023
Int. Cl. G01R 31/396 (2019.01); H01M 10/42 (2006.01); H03K 21/40 (2006.01); H04L 25/02 (2006.01)
CPC G01R 31/396 (2019.01) [H01M 10/425 (2013.01); H03K 21/406 (2013.01); H01M 2010/4271 (2013.01); H04L 25/0276 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A battery monitoring system that monitors states of a plurality of batteries, the battery monitoring system comprising:
a battery monitoring ECU; and
a plurality of battery monitoring devices, wherein
the battery monitoring ECU and the plurality of battery monitoring devices are connected to each other in any connection form of ring connection, daisy chain connection, or multi-drop connection,
the battery monitoring ECU includes
a first clock generator configured to generate a first clock signal, and
a transceiver configured to output a superimposed signal in which battery monitoring information is superimposed on the first clock signal to at least one of the plurality of battery monitoring devices, and receive a monitoring result of the states of the plurality of batteries, and
each of the plurality of battery monitoring devices includes
a receiver configured to receive the superimposed signal from a previous tier,
a second clock generator configured to generate a second clock signal serving as a reference of an operation of a corresponding battery monitoring device,
a controller configured to extract a clock of the superimposed signal from the previous tier as a reference clock signal, and restore the battery monitoring information,
a battery monitor configured to monitor a state of one or more batteries of the corresponding battery monitoring device by using the second clock signal and the battery monitoring information,
a frequency monitor configured to monitor a difference between a frequency of the reference clock signal and a frequency of the second clock signal, and
a transmitter configured to output, to a subsequent tier, the battery monitoring information, the monitoring result on tiers up to a present tier, and difference information indicating the difference on tiers up to the present tier.