Torqeedo Battery Technology

Safe performance – designed down to the last detail for the most demanding use

Lithium-based batteries are the technology of choice for electric mobility applications. They store significantly more energy than all other batteries, they maintain a high current – a major advantage for electric drive systems – they do not lose their charging capacity, they supply power reliably even in the cold and have no memory effect. They also provide many more cycles than lead-based batteries.

Torqeedo has been a pioneer in the development of lithium batteries for boat applications for ten years. Since we make our batteries just a little bit better each year, we offer the most comprehensive and integrated protection and safety concept for lithium batteries on the market – coupled with outstanding performance and convenience.

24 V
› Power 26-104 BatteryLithium high-performance battery with 2,685 Wh
345 V
› Deep Blue High-voltage BatteryLithium high-performance battery with 12.8 kWh

Lithium Battery Safety

Besides performance, safety plays an important role for 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.