Battery device for loading on a mobile system

A battery device for loading on a mobile body comprising:

• a modular casing of synthetic resin encased within an exterior casing, said modular casing comprising two lateral sides including a number of terminal openings both lateral sides;
• a number of secondary batteries loaded in the modular casing with positive electrode terminals and negative electrode terminals alternately disposed in neighboring terminal openings of the modular casing, said secondary batteries being connected in series with one another, with a plurality of the secondary batteries being grouped together as a battery module, said secondary batteries comprising a plurality of such battery modules;
• a plurality of cell control units corresponding to the number of said battery modules of the secondary batteries, each cell control unit including at least one of a micro-processor, circuit elements and electronic components loaded on a circuit board to provide a control signal, each cell control unit being connected to a sensing line connected to each secondary battery, said cell control units each having the functions of detecting and controlling the voltage of each battery module and each secondary battery, of detecting humidity in the exterior casing, and inputting/outputting the control signal from the cell control unit;
• and
• the exterior casing of a synthetic resin material, split into at least two casing halves, said exterior casing defining a housing space for accommodating said modular casings in the assembled state of the casing halves;
• wherein
• positive electrode terminals and negative electrode terminals of said groups of secondary batteries and input/output terminals of said cell control units are provided in said exterior casing;
• and wherein
• said modular casing, containing said secondary batteries and each having said cell control units assembled thereon, is housed in said housing space to constitute an all-in-one unit.