A voltage measurement part 200 measures voltage Vn for each of the blocks of a battery pack 7, electric current In is measured with the same timing by a current measuring circuit 201, and a counter 206 counts the number of times an effective load power Pn ...

Communication means is provided for each of battery ECUs (2a to 2f) so that the battery ECUs (2a to 2f) are connected through a connection cable (6) to communicate with each other. Operating power is constantly supplied to the battery ECU (2a) used as a ma...

There is provided a battery pack system that allows an output limit during short-time discharging and long-time discharging of a secondary battery, and limits the output appropriately upon request of a vehicle. An output limiting section 104 is provided fo...

There is provided a battery pack system with estimation accuracy of a remaining capacity of a secondary batter enhanced. A current accumulation coefficient correction section 109 calculates a correction amount α with respect to a current accumulation coef...

There is provided a battery pack system with enhanced estimation accuracies of a polarization voltage and a remaining capacity of a secondary battery. A polarization voltage calculation section 108 calculates a polarization voltage Vpol from a filtered var...

A leakage detection apparatus is provided, capable of performing high-speed leakage detection during startup of a motor-vehicle such as an HEV. The apparatus includes a signal generator 31 for generating a signal whose frequency is set variably, a resistor...

A battery pack (1) apparatus is configured with a battery pack (5) composed of a plurality of rechargeable batteries (2) arranged in parallel with cooling medium passages (3) formed therebetween, and a cross flow fan (11) which faces a distribution space (...

A method for inspecting relay open/close contacts for a contact weld is provided, each relay open/close contact being connected serially to each of a plurality of battery pack blocks. Battery ECUS (2a to 2f) for controlling the operating condition of each ...

When an SOC difference between battery pack blocks (1a, 1b, 1c, 1d) exceeds a threshold, or a temperature difference between the battery pack blocks exceeds a threshold, a control section (4) changes cooling modes and cooling control maps for cooling fans ...