Power supply system and motor car

摘要

A power supply system includes a first battery module (A) and a second battery module (B). The first battery module (A) comprises a first nonaqueous electrolyte battery comprising a negative electrode containing a carbonaceous material. The second battery module (B) comprises a second nonaqueous electrolyte battery comprising a negative electrode and a positive electrode. The negative electrode contains a negative electrode active material that has a lithium ion absorbing potential of 0.4V (vs.Li/Li + ) or more and an average particle diameter of 1 µm or less. The positive electrode contains lithium metallic oxide represented by Li x Co y M 1-y O 2 . The second battery module (B) is chargeable in a range of 20 to 80% of charging depth so that a charging current density (A/kg) of the second nonaqueous electrolyte battery becomes higher that that of the first nonaqueous electrolyte battery.