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|1. (WO2015046531) LITHIUM ION SECONDARY BATTERY SYSTEM|
|Title:||LITHIUM ION SECONDARY BATTERY SYSTEM|
The purpose of the present invention is to provide a battery system which has improved output characteristics and/or improved storage characteristics, while utilizing a high energy density of a lithium ion secondary battery that is provided with a positive electrode containing a positive electrode active material having an operating potential of 4.5 V or more with respect to lithium metal. The present invention relates to a battery system which is provided with: a first battery that is composed of a 5V class battery; a second battery that is composed of a 4V class battery; and a control system.