For certain applications, the electronic components may be coated to provide conformal protection against moisture, chemicals or other corrosive agents. The module case and internal components are designed to reduce the risk of cell failure propagation to other cells within the case and to other cells in adjacent cells.

Having described preferred embodiments (which are intended to be illustrative and not limiting) for materials, configurations and folding options, it is noted that modifications and variations can be made by persons skilled in the art in light of the above teachings. The battery modules can contain different quantities of battery packs and corresponding chargers. The internal sealed volume, cooling fans and circulatory flow between the battery module and heat exchanger can be configured in a variety of ways. The heat exchanger and battery module can be combined into a single unit. Cooling of the heat exchanger and venting can be accomplished by different means. It is therefore to be understood that changes may be made in the particular embodiments of the invention disclosed which are within the scope and spirit of the invention.