US 12,253,570 B2
Method for determining a state of health of at least one electrochemical energy store
Christian Simonis, Leonberg (DE); and Christoph Woll, Gerlingen (DE)
Assigned to ROBERT BOSCH GMBH, Stuttgart (DE)
Appl. No. 17/788,457
Filed by Robert Bosch GmbH, Stuttgart (DE)
PCT Filed Feb. 18, 2021, PCT No. PCT/EP2021/053977
§ 371(c)(1), (2) Date Jun. 23, 2022,
PCT Pub. No. WO2021/170476, PCT Pub. Date Sep. 2, 2021.
Claims priority of application No. 10 2020 202 561.4 (DE), filed on Feb. 28, 2020.
Prior Publication US 2023/0040199 A1, Feb. 9, 2023
Int. Cl. G01R 31/392 (2019.01); G01R 31/388 (2019.01)
CPC G01R 31/392 (2019.01) [G01R 31/388 (2019.01)] 10 Claims
OG exemplary drawing
 
1. A method for determining a state of health of at least one electrochemical energy store, the method comprising the following steps:
a) measuring a value of a voltage of the electrochemical energy store;
b) comparing the measured value to a predefined setpoint value for the voltage;
c) changing a charge state of the electrochemical energy store by, depending on a result of the comparison of step b), either charging or discharging the electrochemical energy store, to thereby bring the electrochemical energy store into a predefined state in which the electrochemical energy store has the predefined setpoint value for the voltage;
d) based on, and subsequent to, the predefined state being reached, discharging the electrochemical energy store for a predefined time period using predefined electric currents;
e) measuring values of the voltage of the electrochemical energy store during the discharging of step d);
f) determining, based on the values of the voltage obtained by the measuring of step e), a rate at which the voltage of the electrochemical energy store changed over the predefined time period;
g) comparing a value of the determined rate with predefined setpoint rates; and
h) determining the state of health of the electrochemical energy store based on a result of the comparison in step g).