The invention discloses a
lithium ion battery
management system and a control method thereof, and comprises
battery charge and
discharge management scheduling, battery information communication and battery
life assessment. Adding a
battery cell in series or withdrawing the
battery cell in a controlled manner is realized by utilizing a switch circuit.
Data transmission between series battery cells is realized by utilizing hardware and
software forwarding circuits. In a rated
charge and discharge condition, through carrying out
charge and discharge tests on a
lithium ion battery repeatedly, recording
charge and discharge times, and
voltage curve and battery
internal resistance of each charge and
discharge operation, constructing a four-dimensional data table, and determining equivalent cycle times and present full charge capacity of the battery by utilizing an interpolation method, an equivalent cycle life of a
battery pack is determined. According to the invention, energy transduction devices like an
inductance capacitor are not needed, characteristics of batteries in a same
battery pack tend to be consistent, a service life of the
battery pack is prolonged,
overpressure resistant requirements of each component are mitigated, a basic basis of estimating battery full charge capacity and
accurate estimation of a battery life is established, and possibility of large scale interchangeability application is provided.