Battery knowledge · Testing methods
Pulse test
Applying a current step of defined size and duration and recording the voltage response. The instant voltage step gives the ohmic resistance, the following curve the slower polarization; HPPC is a standardised sequence of such pulses across state of charge. [1]
- Also called
- current pulse test, DC pulse
Example
Voltage response and relaxation
At τ = 20 s, 63.2% of the step response is complete; a relaxation retains 36.8%.
Two separate analytical experiments; normalized voltage, not measured data.
Explore the graph
One time constant completes about 63% of a first-order voltage change.
At τ = 20 s, 63.2% of the step response is complete; a relaxation retains 36.8%.
τ = RC; step response = 1 − e^(−t/τ)
Illustrative model. Two separate analytical experiments; normalized voltage, not measured data.
Use in Lemonergy
Design protocol or analysis tool
Build pulse and rest
The bench programs direction, current, timing and repetitions.
Equation or tool to use
- Pulse
Applies repeated pulses
Inputs & settings
- direction
- a
- pulseS / restS
- count
This overview identifies the components to use. Follow the example in Lemonergy for their connections and settings.
Example. 10 A for 10 s adds 100 C, about 0.0278 Ah, before efficiency adjustment.
Observe. Rest and pulse timing change excitation.
Pulse programming does not establish faster, safer or longer-life charging. An existing pack and product access are required.
Open Design → Protocol bench →References & further reading
Technical references
- Battery Test Manual For Electric Vehicles, Revision 3
Jon P. Christopherson · Idaho National Laboratory · 2015
Technical reference · Performance characterization, pulse resistance/power, life testing and reference performance tests; historical 2015 edition.