A key differential with Toyota’s modular approach to li-ion battery design is that the concept is based on cell modules. The capacity of the battery is determined by the number of modules used, and this is configured to match customer requirements. The other advantage of this design is that it can be easily replaced with a corresponding module – a task that can be accomplished quickly by a Toyota technician - reducing the risk of downtime.
Substantially improved efficiency in the charging process and reduction of heat generation mean that lithium-ion batteries gain 20-25% more energy utilisation, compared to lead-acid batteries. Furthermore the new battery systems provide stable voltage regardless of charge level. Combine this with the fact that opportunity charging means that li-ion batteries are normally maintained at a relatively high level of charge, and as a result the battery capacity required for li-ion is significantly lower.
Li-ion batteries are maintenance-free, and thanks to opportunity charging, battery change is also eliminated. This saves space and resource that many operations currently utilise for battery management.