Sealence Solid-State Marine Battery

Will this marine battery give electric propulsion the grunt it needs?

Launched at the Electric & Hybrid Marine Expo 2024, this solid-state battery, designed specifically for marine propulsion, represents a breakthrough in battery technology. Solid state solves many of the issues of other lithium battery technologies, primarily those related to safety and weight. Safety is the inherent strength of solid-state technology, thanks to its stability and the reduction of risks associated with liquid electrolytes. The Battery Management System technology developed by Sealence Power Tech also provides an additional level of safety.

Modularity

A distinguishing feature is the modularity of the system, which allows up to 32 batteries to be easily connected in a whopping 5MWh system. This scalability makes it possible to customise energy solutions according to specific power needs.

Two versions

Sealence Power Tech have announced two versions of their solid-state batteries, designed to meet different needs: the 400V 75kWh version weighing 312kg and an 800V 150kWh model weighing 625kg. Both batteries boast an impressive energy density of 240Wh/kg and a high continuous discharge capacity, which also means a high recharge rate. This feature enables rapid energy delivery – essential for marine applications requiring high outputs and less downtime during charging. Sealence have had a strong focus on green propulsion, having already developed their own ‘high-efficiency DeepSpeed electric jets’. Consequently we can hope that these specifically ‘marine batteries’ as opposed to ‘adapted automotive batteries’ should offer the level of power density that will make electric propulsion more realistic.