Traditional ICE starter batteries are optimized for this cold-cranking power rating, but they only have to deliver this for a matter of seconds before being recharged. They are not designed to deliver this continuously nor to ever be operated at low states of charge.
Conversely, a BEV traction battery has to support a wider range of loads at any charge state between its minimum and maximum charge levels, in order to have decent driving range. Like a starter motor, the BEV is not going to sustain high power output for very long, since a car only takes seconds to accelerate to legal road speeds. After that, it requires continuous output at lower power levels to maintain a cruising speed.
Even with lead-acid batteries, there are regular starter batteries and then there are deep-cycle batteries which have far less cold cranking amps but more durability when depleted to low charge states before being recharged.
The low density of lead-acid batteries is what makes them unsuitable for mobile applications. They might have 30-50 Wh/kg while various lithium ions might be 100-300 Wh/kg. And now this announcement is talking about 500 Wh/kg so 10x the best lead-acid batteries...
Conversely, a BEV traction battery has to support a wider range of loads at any charge state between its minimum and maximum charge levels, in order to have decent driving range. Like a starter motor, the BEV is not going to sustain high power output for very long, since a car only takes seconds to accelerate to legal road speeds. After that, it requires continuous output at lower power levels to maintain a cruising speed.
Even with lead-acid batteries, there are regular starter batteries and then there are deep-cycle batteries which have far less cold cranking amps but more durability when depleted to low charge states before being recharged.
The low density of lead-acid batteries is what makes them unsuitable for mobile applications. They might have 30-50 Wh/kg while various lithium ions might be 100-300 Wh/kg. And now this announcement is talking about 500 Wh/kg so 10x the best lead-acid batteries...