Battery system and electrically driven vehicle equipped with battery system

A battery system, comprising:

• a series unit in which a plurality of battery units are connected in series,
• each of the battery units having a plus output terminal and a minus output terminal at opposite ends of each of the battery units, and including a plurality of battery cells stacked from the plus output terminal to the minus output terminal;
• a heat exchanger coupled with at least one of the battery units in a thermal-coupling state and internally circulating a coolant;
• and
• an outer case housing the series unit and the heat exchanger,
• wherein one of the battery units disposed at an end of the plus output terminal side of the series unit, is disposed at an inclined posture where the end of the plus output terminal side is away from a base plate of the outer case, and
• another of the battery units disposed at an end of the minus output terminal side of the series unit, is disposed at an inclined posture where the end of the minus output terminal side is away from the base plate of the outer case;
• wherein the series unit includes a plurality of divided units connected in series,
• at least two of the battery units in each of the plurality of divided units are connected in series and adjacently disposed in a direction perpendicular to a stacked direction of the battery cells,
• in one of the divided units disposed at the end of the plus output terminal side of the series unit, the battery unit disposed at the end of the plus output terminal side of the one of the divided units, is disposed at an inclined posture where the end of the plus output terminal side is away from the base plate of the outer case, and the battery unit disposed at the end of the minus output terminal side of the one of the divided units, is disposed at an inclined posture where the end of the minus output terminal side is away from the base plate of the outer case, and
• in another of the divided units disposed at the end of the minus output terminal side of the series unit, the battery unit disposed at the end of the minus output terminal side of the another of the divided units, is disposed at an inclined posture where the end of the minus output terminal side is away from the base plate of the outer case, and the battery unit disposed at the end of the plus output terminal side of the another of the divided units, is disposed at an inclined posture where the end of the plus output terminal side is away from the base plate of the outer case;
• wherein the outer case includes a partitioning wall which partitions a bottom portion into a plurality of partitioned spaces, the divided units are disposed in the partitioned spaces into which the partitioning wall partitions, and the partitioning wall blocks a current of the coolant stored at the bottom portion of the outer case between the plurality of partitioned spaces.