Torqeedo Battery Technology
Torqeedo batteries - safe, powerful, user-friendly, and designed to the very last detail for most demanding uses.
Lithium-based batteries are the technology of choice to power electric motors. They store significantly more energy than other batteries, maintain a high current (very advantageous for electric drive systems), do not lose their charging capacity, reliably supply power even in cold conditions, have no memory effect, and also deliver many more cycles than lead-based batteries.
Torqeedo has pioneered the development of lithium batteries for boating applications for ten years. By making our batteries just a little bit better each year, we can offer the most comprehensive and integrated protection and safety concept for lithium batteries in the boating sector.
Lithium Battery Safety
Besides performance, safety plays an important role in lithium batteries. In our view, five influencing factors need to be considered in order to ensure that safe really means safe:
Battery management system (BMS) with redundant safety features
Unlike lead-based batteries, lithium batteries always need a BMS to perform balancing and safety functions. If electronic components of the BMS fail it can itself become a safety problem for the battery. That's why there is hardware backup for all safety-relevant components in Torqeedo batteries. Incidentally, this is also stipulated in the automotive industry, in aerospace and for medical technology.
Safe, individual cell packaging
Torqeedo only uses safety cells – welded steel cylinders each of which is equipped with multiple hardware safety mechanisms. Other forms of packaging such as foil-sealed cells ("coffee bags") offer a lower standard of safety as they afford less effective protection against internal short circuiting within the cells. (An exception here are cells with ceramic separators, which also provide safe packaging, but these are extremely expensive and very seldom used.)
Clean, precision production processes
on the part of the cell manufacturers. Torqeedo only uses cells sourced from reputable manufacturers in Japan and the USA.
Waterproof to IP67
Water in lithium batteries can lead to various problems such as corrosion of the BMS hardware or the creation of electrolytic gas. Lithium batteries on board a boat should therefore be waterproof.
Safe battery chemical engineering
e.g. LiFePo (lithium iron phosphate) or LiNMC (lithium nickel manganese cobalt oxide). These are now widely used.