US 10,889,187 B2
On-vehicle power supply system and a state detecting method for battery contained in on-vehicle power supply system
Yuki Nakanishi, Shizuoka (JP); Kazuhiro Sugie, Shizuoka (JP); and Takeshi Chiba, Shizuoka (JP)
Assigned to GS Yuasa International Ltd., Kyoto (JP)
Appl. No. 16/66,240
Filed by GS Yuasa International Ltd., Kyoto (JP)
PCT Filed Jan. 11, 2017, PCT No. PCT/JP2017/000682
§ 371(c)(1), (2) Date Jun. 26, 2018,
PCT Pub. No. WO2017/122698, PCT Pub. Date Jul. 20, 2017.
Claims priority of application No. 2016-004260 (JP), filed on Jan. 13, 2016.
Prior Publication US 2020/0269699 A1, Aug. 27, 2020
Int. Cl. B60L 58/18 (2019.01); B60L 58/12 (2019.01); B60K 6/28 (2007.10); B60R 16/033 (2006.01); B60L 3/00 (2019.01)
CPC B60L 3/0092 (2013.01) [B60K 6/28 (2013.01); B60L 58/12 (2019.02); B60L 58/18 (2019.02); B60R 16/033 (2013.01); B60L 2210/10 (2013.01); B60Y 2200/92 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An on-vehicle power supply system, comprising:
a main battery,
a sub battery connected in parallel with the main battery,
a voltage adjuster which controls a voltage of power supplied from the main battery and the sub battery, and
a state detector which detects a state of the sub battery,
wherein:
the state detector comprises:
a first calculating unit which obtains a first internal resistance that contains a reaction resistance and a parts resistance of the sub battery,
a second calculating unit which obtains a second internal resistance that contains a reaction resistance of the sub battery, and
a state determining unit which determines a state of the sub battery,
the first calculating unit calculates the first internal resistance based on a voltage drop amount and an inrush current of the sub battery when supplying power to a load,
the second calculating unit calculates the second internal resistance based on a relation between a voltage and a current of the sub battery when forcedly discharging the sub battery by controlling the voltage adjuster immediately after calculating the first internal resistance and thereafter once or more, and
the state determining unit determines the state of the sub battery based on the first internal resistance and a transition of the second internal resistance.