Patent ID: 11901575
Assignee: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A battery pack, comprising a battery pack case and a plurality of battery cells accommodated in the battery pack case, wherein
an inner space of the battery pack case may be divided into a first region located at the center and a second region enclosing the first region; and
the plurality of battery cells comprise: at least one first battery cell disposed in the first region; and at least one second battery cell disposed in the second region, wherein
an internal resistance of the first battery cell and an internal resistance of the second battery cell increase with the decrease of a temperature, and when the internal resistance of the first battery cell and the internal resistance of the second battery cell are respectively RA1 and RB1 at 25° C. and are respectively RA2 and RB2 at −20° C., 1≤RB1/RA1≤2 and 1.2≤RB2/RA2≤2.5, optionally, 1.3≤RB1/RA1≤1.6 and 1.3≤RB2/RA2≤1.7.