Battery system and estimation system
A battery system is configured to be mounted on a vehicle. The battery system includes a secondary battery, a detection device, and an electronic control unit. The electronic control unit is configured to perform communication with an external device that accumulates temperature history data of other vehicle, and is configured to acquire, when the battery temperature of the temperature history data of the vehicle contains an abnormal value, the temperature history data of the other vehicle within a period in which the battery temperature of the temperature history data of the vehicle contains the abnormal value, from the external device, and execute correction of the abnormal value of the battery temperature based on the temperature history data acquired from the external device.
1. A battery system configured to be mounted on a vehicle, the battery system comprising:
a secondary battery;
a detection device configured to detect a battery temperature that is a temperature of the secondary battery; and
an electronic control unit configured to estimate a deteriorated state of the secondary battery using temperature history data including the battery temperature and a detection time of the battery temperature, wherein
the electronic control unit is configured to perform communication with an external device that accumulates temperature history data of another vehicle,
the electronic control unit is configured to acquire, when the battery temperature of the temperature history data of the vehicle contains an abnormal value, the temperature history data of the other vehicle within a period in which the battery temperature of the temperature history data of the vehicle contains the abnormal value, from the external device, and
the electronic control unit is configured to execute correction of the abnormal value of the battery temperature based on the temperature history data acquired from the external device.
2. The battery system according to claim 1 , wherein the electronic control unit is configured to execute at least one of supplementation of a missing value of the battery temperature contained in the temperature history data of the vehicle and substitution of an outlier of the battery temperature contained in the temperature history data of the vehicle, as the correction of the abnormal value.
3. The battery system according to claim 1 , wherein:
the electronic control unit is configured to perform communication with the external device that accumulates temperature history data including the battery temperature, the detection time, and a detection position that is a position of the other vehicle when the battery temperature is detected from a plurality of the other vehicles which are parked; and
the electronic control unit is configured to acquire the temperature history data of the other vehicle within the period, from the external device based on the detection time and the detection position.
4. The battery system according to claim 1 , wherein:
the electronic control unit is configured to perform communication with the other vehicle located around the vehicle as the external device; and
the electronic control unit is configured to acquire temperature history data of the other vehicle within the period, from the other vehicle.
5. The battery system according to claim 1 , wherein:
the electronic control unit is configured to calculate an amount of increase in internal resistance of the secondary battery using a time during which the battery temperature is held in each of a plurality of temperature ranges;
the electronic control unit is configured to calculate an amount of decrease in the internal resistance with a change in a state-of-charge use region of the secondary battery; and
the electronic control unit is configured to estimate a deteriorated state of the secondary battery based on the internal resistance calculated from an initial value of the internal resistance, the amount of increase, and the amount of decrease.
6. An estimation system configured to estimate a deteriorated state of a secondary battery mounted on a vehicle, the estimation system comprising:
an estimation device configured to estimate the deteriorated state of the secondary battery using temperature history data including a battery temperature that is a temperature of the secondary battery and a detection time of the battery temperature;
a server configured to collect temperature history data of a plurality of vehicles other than the vehicle; and
a communication device configured to perform communication between the estimation device and the server, wherein:
the estimation device is configured to acquire, when the battery temperature of the temperature history data of the vehicle contains an abnormal value, temperature history data of the other vehicle within a period in which the battery temperature of the temperature history data of the vehicle contains the abnormal value, from the server via the communication device; and
the estimation device is configured to execute correction of the abnormal value based on the acquired temperature history data of the other vehicle.
7. The battery system according to claim 1 , wherein:
the external device includes a server that collects temperature history data from a plurality of other vehicles which are parked, the temperature history data from the plurality of other vehicles each includes the battery temperature, the detection time, and a detection position that is a position of the other vehicle when the battery temperature is detected; and
the electronic control unit is configured to acquire the temperature history data of the other vehicle within the period, from the external device based on the detection time and the detection position.