Patent ID: 8228037
Filing Date: 2012-07-24
Classification: B60L,H02H,H02J,Y02T

Abstract:
1. A battery system comprising: a battery provided with a plurality of rechargeable battery cells; a fuse connected in series with the battery that is self-fusing with excessive current flow; relays connected in series with the output-side of the battery; and a current cut-off circuit that detects excessive battery current and controls the relays from ON to OFF, wherein the current cut-off circuit detects excessive battery current, and is provided with a timer section that designates a delay time from the time excessive current is detected until the relays are switched from ON to OFF, wherein for the delay time of the timer section, the fusing current of the fuse is set lower than the maximum cut-off current of the relays and higher than the maximum allowable battery charging and discharging current, and in a situation where excessive current greater than the maximum cut-off current of the relays flows through the battery, the fuse is blown during the timer section delay time, and the current cut-off circuit switches the relays from ON to OFF when the delay time has elapsed.