Abstract: According to one embodiment, a vehicular storage battery device includes a housing, battery boxes, and a common cooling passage. The battery boxes are disposed in the housing. Each of the battery boxes houses an electric cell as a vehicle power source and includes a heat transporting part transporting heat generated in the battery box to outside of the battery box. The common cooling passage is disposed in the housing. The common cooling passage is provided with an inlet for taking in a fluid and an outlet for discharging the fluid having passed through the passage. The inlet and the outlet are open in a direction different from a traveling direction of the vehicle. The heat transporting part of each of the battery boxes is exposed to inside of the passage.

Abstract: According to one embodiment, a vehicular storage battery device includes a housing, battery boxes, and a common cooling passage. The battery boxes are disposed in the housing. Each of the battery boxes houses an electric cell as a vehicle power source and includes a heat transporting part transporting heat generated in the battery box to outside of the battery box. The common cooling passage is disposed in the housing. The common cooling passage is provided with an inlet for taking in a fluid and an outlet for discharging the fluid having passed through the passage. The inlet and the outlet are open in a direction different from a traveling direction of the vehicle. The heat transporting part of each of the battery boxes is exposed to inside of the passage.

Abstract: A system performs: acquiring historical data in which for each unit period, a high price and a low price of transaction price are related to a start time or an end time of a unit period; identifying the lowest price and the highest price of transaction price from the acquired historical data; acquiring a transaction price at predetermined time intervals; and based on the identified lowest price and highest price and the transaction price, calculating an index value indicating a trend in the transaction price. The system performs: at each time of acquiring the transaction price, based on the acquired transaction price and the identified lowest and highest prices, updating the lowest price or the highest price of transaction price; and based on the updated one of the lowest price and the highest price, the other one not updated, and the acquired transaction price, calculating the index value.