Battery knowledge · Thermal management and heat transfer
Heat transfer modes
The three ways heat moves: conduction through solids and still fluids, convection carried by a moving fluid, and radiation emitted as infrared by every warm surface. In a pack, conduction takes heat from the cell into the cooling plate and convection carries it away in the coolant; radiation matters mainly at the high temperatures of thermal runaway. [1]
- Also called
- conduction, convection, thermal radiation
Example
Thermal management and heat transfer: an example situation
Equal total heat in different layouts can produce different gradients. Average temperature can miss a hot spot.
Read Heat transfer modes alongside Cooling plate in this context. A flat aluminium channel assembly under or between the cells through which coolant, usually a water–glycol mix, is pumped. Heat crosses from cell to plate through a thermal interface material; the plate also sets the pack’s temperature uniformity.
Use in Lemonergy
Lemonergy Studio blocks
Electrothermal resistor worked example
Linear temperature coefficient with positive floor; all electrical dissipation enters the thermal port
Blocks to use
- Electrothermal resistor
Conserving component solved simultaneously with the connected network. Linear temperature coefficient with positive floor; all electrical dissipation enters the thermal port
Inputs & settings
- Use the block reference for settings and connections.
- Bundled example verified on the production release of 28 October 2026.
This overview identifies the components to use. Follow the example in Lemonergy for their connections and settings.
- Review the interface, units and model limits.
- Open the Studio example and run its bundled model.
- Compare outputs with the numerical checks; change one input and run again.
Example. Editable first-party network. supply: voltageV=12; hot-boundary: differenceK=350; cold-boundary: differenceK=300. Checks below were verified in the native execution engine.
Observe. Inspect the output channels and checks on the block reference page.
Linear temperature coefficient with positive floor; all electrical dissipation enters the thermal port Demonstration parameters are not calibrated hardware data. Singular or incompatible ideal constraints and unsupported state ranges stop the run.
Open Studio example →Lemonergy Studio blocks
Insulated branch with initial temperature target worked example
Zero heat transfer; initializes directly attached unspecified thermal storage temperatures and verifies the consistent initial difference
Blocks to use
- Insulated branch with initial temperature target
Conserving component solved simultaneously with the connected network. Zero heat transfer; initializes directly attached unspecified thermal storage temperatures and verifies the consistent initial difference
Inputs & settings
- Use the block reference for settings and connections.
- Bundled example verified on the production release of 28 October 2026.
This overview identifies the components to use. Follow the example in Lemonergy for their connections and settings.
- Review the interface, units and model limits.
- Open the Studio example and run its bundled model.
- Compare outputs with the numerical checks; change one input and run again.
Example. Editable first-party network. constraint: initialDifferenceK=20. Checks below were verified in the native execution engine.
Observe. Inspect the output channels and checks on the block reference page.
Zero heat transfer; initializes directly attached unspecified thermal storage temperatures and verifies the consistent initial difference Demonstration parameters are not calibrated hardware data. Singular or incompatible ideal constraints and unsupported state ranges stop the run.
Open Studio example →Lemonergy Studio blocks
Phase-change thermal mass worked example
Enthalpy storage with a finite linear melting interval; constant sensible heat capacity, no supercooling or hysteresis
Blocks to use
- Phase-change thermal mass
Conserving component solved simultaneously with the connected network. Enthalpy storage with a finite linear melting interval; constant sensible heat capacity, no supercooling or hysteresis
Inputs & settings
- Use the block reference for settings and connections.
- Bundled example verified on the production release of 28 October 2026.
This overview identifies the components to use. Follow the example in Lemonergy for their connections and settings.
- Review the interface, units and model limits.
- Open the Studio example and run its bundled model.
- Compare outputs with the numerical checks; change one input and run again.
Example. Editable first-party network. mass: specificHeatJkgK=2; mass: latentHeatJkg=100; mass: solidusK=310; mass: liquidusK=320; mass: initialTemperatureK=310; heater: heatFlowW=12. Checks below were verified in the native execution engine.
Observe. Inspect the output channels and checks on the block reference page.
Enthalpy storage with a finite linear melting interval; constant sensible heat capacity, no supercooling or hysteresis Demonstration parameters are not calibrated hardware data. Singular or incompatible ideal constraints and unsupported state ranges stop the run.
Open Studio example →All connected Lemonergy block references
- Electrothermal resistor
- Insulated branch with initial temperature target
- Phase-change thermal mass
- Thermal conductor
- Controlled heat flow source
- Controlled temperature difference source
- Thermal convection
- Heat flow sensor
- Heat flow source
- Insulated thermal port
- Thermal mass
- Thermal radiation
- Thermal reference
- Thermal resistance
- Temperature sensor
- Temperature difference source
- Controlled thermal resistance
Studio interfaces connected to this concept
These components declare this quantity or operation. Their individual pages distinguish authoring metadata from numerical verification.
- Edge-cooled plate
- Insulated branch with initial temperature target
- Coolant pressure and temperature boundary
- Parallel-channel plate
- Phase-change thermal mass
- Thermal conductor
- Controlled heat flow source
- Controlled temperature difference source
- Thermal convection
- Heat flow sensor
- Heat flow source
- Insulated thermal port
- Thermal mass
- Thermal radiation
- Thermal reference
- Thermal resistance
- Temperature sensor
- Temperature difference source
- Controlled thermal resistance
- U-channel plate
References & further reading
Technical references
- University Physics Volume 2, §1.6: Mechanisms of Heat Transfer
OpenStax, Rice University
Technical reference · Conduction, convection, radiation and thermal resistance.
Further reading on this topic
These sources provide broader context; they are not presented as citations for every statement in this entry.
- A General Energy Balance for Battery Systems
Dawn Bernardi, Ellen Pawlikowski, John Newman · Journal of The Electrochemical Society · 1985
Topic background · Battery energy balance and irreversible and reversible heat contributions. Reduced thermal models require explicit assumptions and current-sign conventions.