| 摘要 |
PURPOSE:To obtain a diagnostic device by which no charge capacity is lost, a service life can be diagnosed exactly, and an advance detection and a continuous monitor of a service life can be executed easily, by deciding a service life by detecting a variation of the specific gravity of an electrolyte corresponding to an integrating charge current. CONSTITUTION:A specific gravity sensor 2 installed in the vicinity of an electrode plate of a battery 1 detects the specific gravity of an electrolyte by a specific gravity converting system using an optical fiber or an optical prism. A current sensor 3 consisting of a Hall element, etc. installed to a charge/ discharge wire of the battery 1 detects a discharge current. A charge current integrating circuit 4 brings an output of the current sensor 3 to an integrating processing, and a specific gravity variation detecting circuit 5 compares successively an output of the specific gravity sensor 2 in accordance with an integrating charge current obtained by integrating, and detects a variation quantity of the specific gravity. The detected variation quantity of the specific gravity is discriminated by a variation quantity discriminating circuit 6, and a service life is diagnosed.
|
