| 摘要 |
PURPOSE: To efficiently and surely hold and exhibit large-capacity function by setting resistance for current detection of a wiring circuit as pattern resistance. CONSTITUTION: A resistance pattern 3' for current detection is interposed in a wiring circuit 6a which is provided with a wiring pattern for connecting to a battery group in which secondary batteries 1a are connected in series, and a wiring pattern for connecting to a capacity detection circuit part 4. And the pattern 3' is formed as a pattern continuing (linking) to the wiring patterns, etc., connected to the group 1 and the part 4. In this case, both ends of the pattern 3' are electrically connected to the part 4 respectively by a wiring pattern and current is measured from the voltage between the both ends of the pattern 3'. Secondarily, this measurement value is input in the part 4 and the charge quantity in the present states of the secondary battery system power supply is detected in real time based on a data holding means (for example, an IC memory) of the part 4. And adoption of such constitution for the secondary battery pack can easily secure functional reliability, reduce total cost, and improve yield. |
