Degraded state estimation apparatus for battery

A degraded state estimation apparatus for a battery mounted on a vehicle, the degraded state estimation apparatus being configured to estimate a degraded state of the battery for travel of the vehicle, the degraded state estimation apparatus comprising:

• a detector configured to detect a first state quantity, a second state quantity, and a third state quantity, each of which corresponds to either current of the battery, voltage of the battery, or temperature of the battery;
• a storage configured to hold (1) a first map including first degrees of degradation of the battery, one of which is selected by the detected first state quantity and second state quantity, and (2) a second map including second degrees of the degradation of the battery, one of which is selected by the detected second state quantity and third state quantity;
• and
• circuitry configured to:
• obtain ones of the first degrees of the degradation obtained from the first map in response to the detector repeatedly detecting the first state quantity and the second state quantity, and obtain ones of the second degrees of the degradation obtained from the second map in response to the detector repeatedly detecting the second state quantity and the third state quantity;
• obtain a first integrated value of the ones of the first degrees of the degradation obtained from the first map, and obtain a second integrated value of the ones of the second degrees of the degradation obtained from the second map;
• weight the first integrated value based on a first weighting coefficient, and weight the second integrated value based on a second weighting coefficient;
• and
• estimate an amount of change in the degradation of the battery based on the weighted first integrated value and the weighted second integrated value, wherein.

A degraded state estimation apparatus for a battery mounted on a vehicle, the degraded state estimation apparatus being configured to estimate a degraded state of the battery for travel of the vehicle, the degraded state estimation apparatus comprising:

• a voltage sensor configured to detect voltage of the battery;
• a current sensor configured to detect current of the battery;
• a temperature sensor configured to detect temperature of the battery;
• a storage configured to hold (1) a first map indicating first degrees of degradation of the battery per a predetermined time, one of which is selected by the detected voltage and the detected current of the battery, (2) a second map indicating second degrees of degradation of the battery per the predetermined time, one of which is selected by the detected current and the detected temperature of the battery, and (3) a third map indicating third degrees of degradation of the battery per the predetermined time, one of which is selected by the detected voltage and the detected temperature of the battery;
• and
• circuitry configured to:
• execute, from a first timing to a second timing, an obtaining process every the predetermined time, wherein a period of time between the first timing and the second timing is longer than the predetermined time, and wherein, in the obtaining process, the circuitry is configured to (1) obtain one of the first degrees of the degradation from the first map based on latest detected voltage and latest detected current of the battery, (2) obtain one of the second degrees of the degradation from the second map based on latest detected current and latest detected temperature of the battery, and (3) obtain one of the third degrees of the degradation from the third map based on latest detected voltage and latest detected temperature of the battery;
• calculate, after the second timing, (1) a first integrated value by integrating the first degrees of the degradation obtained by executing the obtaining process from the first timing to the second timing, (2) a second integrated value by integrating the second degrees of the degradation obtained by executing the obtaining process from the first timing to the second timing, and (3) a third integrated value by integrating the third degrees of the degradation obtained by executing the obtaining process from the first timing to the second timing;
• weight the first integrated value based on a first weighting coefficient, weight the second integrated value based on a second weighting coefficient, and weight the third integrated value based on a third weighting coefficient;
• and
• calculate an amount of change in the degradation of the battery from the first timing to the second timing by adding the weighted first integrated value, the weighted second integrated value and the weighted third integrated value.