Patent ID: 9738174
Date: 2017-08-22
CPC Classifications: B60L,H01M,H02J,Y02E,Y02T

Claim:
1. A lithium battery system comprising: a first battery pack comprising a plurality of first battery cells connected in series, the first battery pack being configured to be connected in parallel to an alternator and a second battery pack, and having a lower capacity than the second battery pack, wherein a negative electrode of each of the first battery cells comprises a negative electrode active material, and the negative electrode active material comprises a carbon-based material having an interlayer spacing of a (002) plane of 0.34 nm to 0.50 nm in X-ray diffraction measurement using copper (Cu) Kα lines; and wherein a current path between the first battery pack and the alternator is shorter than a current path between the second battery pack and the alternator, and wherein an operation voltage range of each of the first battery cells comprises an enhanced voltage range below 2V for cranking of a vehicle at a cold temperature.