Patent ID: 8766566

Claim:
A battery temperature rise causing system comprising: a rechargeable battery that holds electric power; an accumulator that accumulates the electric power received from the battery; a voltage converting unit that performs voltage conversion of the electric power between the battery and the accumulator; and a control unit that receives a battery temperature of the battery and controls the converting unit, when the received battery temperature is lower than a reference value, to increase the battery temperature while alternately transferring electric power from the accumulator to the battery and from the battery to the accumulator, wherein the control unit receives a battery voltage of the battery and controls the converting unit to change a transfer direction of the electric power between the battery and the accumulator each time the received battery voltage reaches a battery upper limit or a battery lower limit, the control unit receives an accumulated power voltage of the accumulator and controls the converting unit to change the transfer direction of the electric power between the battery and the accumulator each time the accumulated power voltage reaches an accumulator upper limit or an accumulator lower limit, and the control unit controls the converting unit to transfer the electric power from the accumulator to the battery when a predetermined period of time has elapsed from a start of the transfer of the electric power from the battery to the accumulator before the accumulated power voltage reaches the accumulator upper limit.