Battery thermal model with thermal management

Block appearance in REPEAT VISION

 This block models the battery as a thermal mass and calculates its temperature taking into account two parallel heat exchange circuits:

1. Natural convection with the environment.

2. Forced convection (thermostat) using a circulating coolant.

Operating principle:

 Battery temperature is calculated based on battery losses and heat dissipated through both convection circuits. The block simulates the operation of the battery cooling/heating system. To turn on the thermostat system, you need to send the corresponding command to the input port Thermal management system control of the block.

Input signals of the model:

1. Ambient temperature, °C

2. Coolant temperature, °C

3. Thermostat control signal (e.g. 0/1 for on/off)

Output signal:

• Current battery temperature, °C

1.  Properties

Property	Default Value	Description	Units of measurement
Specific heat capacity	1200	–	J/(kg·K)
Battery mass	250	–	kg
Initial temperature	20	–	°С
Effective heat transfer area for natural convection	2.8	–	m\(^2\)
Heat transfer coefficient for natural convection	12	–	W/m\(^2\)/K
Effective heat transfer area during forced convection	1.5	–	m\(^2\)
Heat transfer coefficient during forced convection	20	–	W/m\(^2\)/K

2.  Inputs and outputs

Parameters	Input/Output	Description	Units of measurement	Port type
Heat losses	Input	–	W	Automation
Environment temperature	Input	–	°С	Automation
Thermal management system control (0 - OFF, 1 - ON)	Input	–	°С	Automation
Coolant temperature of the thermal management system	Input	–	°С	Automation
Battery temperature	Output	–	°С	Automation

In order to see the connection capabilities of the block, you need to go to page Description of block ports