Battery knowledge · Charging and discharging
Charge acceptance
How much of the current offered to a battery it can actually absorb at a given state of charge and temperature. It falls as the battery fills and as it cools, which is why regenerative braking and fast charging are limited by the battery rather than the source. [1]
Example
The limit sets the permitted current
Requested current: 8 A. At 50 °C the chosen limit permits 5 A.
Breakpoints are invented teaching values, not operating limits for a particular battery.
Explore the graph
A requested current is clipped wherever an active limit is lower.
Requested current: 8 A. At 50 °C the chosen limit permits 5 A.
I_command = min(I_requested, I_limit)
Illustrative model. Breakpoints are invented teaching values, not operating limits for a particular battery.
Use in Lemonergy
Design protocol or analysis tool
Find the charge-time limit
The separate Charge session compares power, current, acceptance and CV limits.
Equation or tool to use
- Charge session
Runs against the selected cell and pack
Inputs & settings
- Source power
- Connector current
- Start / target SOC
- End-of-charge C-rate
This overview identifies the components to use. Follow the example in Lemonergy for their connections and settings.
- Select a rechargeable cell and pack.
- Open Analysis → Charge session; increase power.
Example. A 50 kW source at 400 V cannot deliver 50 kW through a 100 A ceiling; that current limit corresponds to 40 kW.
Observe. Read the named limiting reason.
This differs from the Studio network and requires cell resistance data and product access.
Open Design → Charge session →References & further reading
Technical references
- Lithium-ion battery fast charging: A review
Anna Tomaszewska et al. · eTransportation · 2019
Technical reference · CC-CV and alternative charging protocols, transport limitations, degradation and thermal implications; results depend on cell and test conditions. Software behavior is documented separately in Lemonergy block references.