Battery Model

Analysis > Battery > Battery Model

The Battery Model tool can be used to define parameters to construct a Battery Equivalent Circuit Model (ECM). Currently this tool can be used to model a first order ECM for the battery thermal analysis workflow under Solution > Battery > Electric conduction.

The heat generation in the battery cell (joule heating and heat generated due to electrochemical reaction) is computed using the parameters defined in the tool.

Following parameters can be defined as a function of SOC and temperature
  • Internal Cell Resistance
  • Open Circuit Voltage
  • Polarized Resistance
  • Polarized Capacitance

Charge/Discharge cycle parameter:

  • The parameters can be defined for either a charge or a discharge cycle.
  • The table can be used to input electrical parameters as a function of both SOC and temperature.
  • SOC is defined in the first row and the corresponding temperature is defined in the first column.
  • The electrical parameters (Voltage/ Resistance/ Capacitance) can be defined in the remaining cells, thus forming a matrix.
  • Entry in the 1st cell of the table should be zero or empty.
Note:
  • Maximum cell temperature can be used to identify cells whose temperature has exceeded the mentioned maximum temperature.
  • The cells with temperature higher than the maximum temperature is written out in a text file during the analysis.
    • The generated text file will be named as “OSswitch” and it will be placed next to the H3D file in the results folder (Results > Right click > Open Results Folder).
  • The bodies of the battery cells should be named in M#S#P# format. The battery cell parameters will be assigned only to the bodies named in the above format.
    • E.g.: M1S1P2, represents cell in the 1st Module, 1st Series, and 2nd Parallel connection.
    • Cell Ordering tool under Analysis > Classify Parts can be used to rename the battery cell bodies in the required format.
    • Currently this renaming feature is supported only for cells arranged in rectangular pattern.

Limitation in the current version:

  • Polarized resistance (RP)and Polarized capacitance (CP) values are not considered now to compute the heat generation in battery cells. And hence they are not mandatory parameters.