Patent ID: 9531046
Filing Date: 2016-12-27
CPC Classification: H01M,Y02E

Claim Text:
1. A battery pack comprising: a plurality of battery cell stacks, arranged in a battery cell stack arrangement direction, in each of the battery cell stacks, a plurality of battery cells are stacked in a battery cell stacked direction which is perpendicular to the battery cell stack arrangement direction; a battery pack casing comprising an inside chamber configured to accommodate the battery cell stacks in the inside chamber, a fluid drive section configured to generate and circulate a fluid circulation in an inside chamber of the battery pack casing, the fluid circulation cooling or heating the battery cells; first to fourth temperature detection devices configured to detect a temperature of the battery cells, the first and second temperature detection devices being arranged on the battery cells located at corner sections on a diagonal direction of the inside chamber of the battery pack casing, and the third and fourth temperature detection devices being arranged on the battery cells located at a central position in the inside chamber of the battery pack casing facing to each other in the battery cell stack arrangement direction; and a battery management section configured to receive temperature information detected by and transmitted from the temperature detection devices, wherein when a first battery cell stack and a second battery cell stack are selected from the plural battery cell stacks arranged in the battery cell stack arrangement direction, at least one of the temperature detection devices arranged on a battery cell in the first battery cell stack detects a temperature of a battery cell, on which no temperature detection device is arranged, in the second battery cell stack, the battery management section estimates a temperature of the battery cell located opposite, in the battery cell stack arrangement direction, to the battery cell on which the first temperature detection device is arranged on the basis of the received temperature information transmitted from the first temperature detection device, the battery management section estimates a temperature of the battery cell located opposite, in the battery cell stack arrangement direction, to the battery cell on which the second temperature detection device is arranged on the basis of the received temperature information transmitted from the second temperature detection device, and the battery management section judges occurrence of an abnormal state of the battery cell stacks on the basis of the temperature information transmitted from the first to fourth temperature detection devices.