Battery cabinet current exceeds limit

What happens if you don't have a reliable battery limit?

Failure to have reliable limits can allow the main control computer to draw too much current from the battery, causing the limits to suddenly dive. In order to respect the new limit, the main drive computer would be forced to reduce current, leading to a jerky or possibly dangerous driving experience.

What are battery limit calculations?

The limit calculations take into account the health of the battery pack, internal resistance, battery temperature, and also enforce the maximum pre-set limits in the programmable battery profile for current draw at various temperatures. Values can be expressed in amps or kilowatts for automotive applications.

Why do batteries have a maximum current rating?

Battery cells are permanently degraded when discharged at a high current. Which is why manufacturers specify a maximum current rating. Its value is not a hard limit: degradation occurs even if the current is less than the rating, just not as fast.

Why should battery current be artificially limited?

With some batteries the current should be artificially limited to protect the battery from self-destruction. It may be able to produce a high current for a short time and then chemical products build up that limit the current ("polarization"). The electrolyte and connections will have some resistance and that limits the current.

What is the maximum power point of a battery?

If so, the battery voltage is half of the nominal (e.g., 4.5 V) and the power wasted in heat is equal to the power doing work in the load (the efficiency is 50 %). This is called the "Maximum Power Point". Additionally, there are physical effect that limit the current even further, such as the mobility of the ions inside the battery cells.

Can a battery supply a high current?

It's possible to design batteries that can supply extremely high currents for short periods of time, for applications such as power tools and electric vehicles. The current will always be limited, of course. An ideal voltage source can supply whatever current the load wants, unlimited. But a battery is not an ideal voltage source. So, it can't.