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US 10,539,627 B2Granted
Method of restoring secondary battery and method of reusing secondary battery
AssigneeToyota Jidosha Kabushiki Kaisha
InventorToshihiko Mitsuhashi
Life of this patent
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Abstract
A secondary battery restoring method includes a first step of determining whether or not a value of an input-output characteristic of a secondary battery or a battery module is within a predetermined range of reference values, and a second step of adjusting the secondary battery or the battery module to a predetermined low SOC condition of from 0% to 20% SOC and thereafter leaving the secondary battery or the battery module to stand if, in the first step, the value of the input-output characteristic is determined to be outside the predetermined range of reference values.
Claims3
A secondary battery restoring method comprising:
- a first step of determining an I-V resistance value of a secondary battery or a battery module is within a predetermined range of reference I-V resistance values;
- the first step comprising adjusting the secondary battery or the battery module to 45% to 70% SOC, then discharging the secondary battery or the battery module at a predetermined constant current value for a predetermined time, and then measuring the I-V resistance value of the secondary battery or the battery module and determining if it is within the predetermined range of the reference I-V resistance values;
- a second step of adjusting the secondary battery or the battery module to a predetermined low SOC condition of from 0% to 20% SOC and thereafter leaving the secondary battery or the battery module to stand if, in the first step, the I-V resistance value was determined to be outside the predetermined range of reference I-V resistance values;
- and
- a third step of determining, subsequent to the second step, whether the I-V resistance value of the secondary battery or the battery module is within the predetermined range of reference I-V resistance values;
- the third step comprising adjusting the secondary battery or the battery module to 45% to 70% SOC, then discharging the secondary battery or the battery module at a second predetermined constant current value for a second predetermined time, and then measuring the I-V resistance value of the secondary battery or the battery module and determining if it is within the predetermined range of the reference I-V resistance values.
3 more elements
A secondary battery reusing method comprising:
- a first step of determining an I-V resistance value of a secondary battery or a battery module is within a predetermined range of reference I-V resistance values;
- the first step comprising adjusting the secondary battery or the battery module to 45% to 70% SOC, then discharging the secondary battery or the battery module at a predetermined constant current value for a predetermined time, and then measuring the I-V resistance value of the secondary battery or the battery module and determining if it is within the predetermined range of the reference I-V resistance values;
- a second step of adjusting the secondary battery or the battery module to a predetermined low SOC condition of from 0% to 20% SOC and thereafter leaving the secondary battery or the battery module to stand for a predetermined time period if, in the first step, the I-V resistance value was determined to be outside the predetermined range of reference I-V resistance values;
- a third step of determining, subsequent to the second step, whether the I-V resistance value of the secondary battery or the battery module is within the predetermined range of reference I-V resistance values;
- the third step comprising adjusting the secondary battery or the battery module to 45% to 70% SOC, then discharging the secondary battery or the battery module at a second predetermined constant current value for a second predetermined time, and then measuring the I-V resistance value of the secondary battery or the battery module and determining if it is within the predetermined range of the reference I-V resistance values;
- a fourth step of determining the secondary battery or the battery module to be unusable if, in the third step, the I-V resistance value was determined to be outside the predetermined range of reference I-V resistance values;
- and
- a fifth step of determining that the secondary battery or the battery module is usable if, in the first step or in the third step, the I-V resistance value was determined to be within the predetermined range of reference I-V resistance values.
5 more elements
Dependencies are inferred from the claim text.