| 摘要 |
PROBLEM TO BE SOLVED: To provide a power system for a traveling vehicle, which can secure safety, even when the control circuit does not work as normal. SOLUTION: The power system 10 is a 42 V power system, and here a lead storage battery 1, where eighteen cells of control valve type lead storage batteries are connected in series, and a lithium secondary battery 2, where twelve pieces of lithium ion secondary batteries are connected in series, are connected to each other in parallel. At braking, regeneration energy from a motor generator 3 is accepted in the lithium secondary battery 2, and at engine start, it is discharged from the lead storage battery 1 to load 4. The lead storage battery 1 and the lithium secondary battery 2 are related by (a number Na of the aqueous solution secondary batteries of the lead storage battery 1)×(a maximum voltage value A when charged one cell of the lead storage battery 1 with a current upper-limit value in use range)<(a number Nn of the lithium ion secondary batteries of the lithium secondary battery 2)×(a voltage upper limit value B in the safely usable range of one cell of the lithium secondary battery 2). COPYRIGHT: (C)2003,JPO |
