Passive Balancing Interface

Interface for cell balancing between battery and cell supervisory circuit

Since R2024a

• 

Libraries:
Simscape / Battery / HIL

Description

The Passive Balancing Interface block provides an abstracted vectorized interface for cell balancing between a battery and a cell supervisory circuit. Use this block with desktop simulations and hardware-in-the-loop battery emulation hardware.

A cell supervisory circuit is an electronic circuit that connects to battery cells or parallel assemblies. You can use this circuit to normalize voltages or states-of-charge (SOC) inside a module or pack. In the real world, you implement this equipment between your battery and the battery management system (BMS) control.

This figure represents the real-world equipment, voltages, and currents.

To avoid damaging your battery and to test your cell balancing algorithms under standard operational conditions and fault conditions, you can use hardware-in-the-loop battery emulation hardware. You can use an abstracted interface to connect, set, and configure the passive balancing BMS to your emulated battery.

In this figure:

• The blue color represents the real-world equipment, voltages, and currents.

• The green color represents the interface between the real-world and simulated equipment, voltages, and currents.

• The orange color represents the simulated equipment, voltages, and currents.

The Passive Balancing Interface block provides the abstract representation of power electronic equipment without the need to model it in detail. For example, if you have a battery pack with different levels of temperature or voltage in its constituent parts, you can use this block to check if the BMS is correctly balancing your pack after operational scenarios.

Ports

Input

Ibat — Current flowing through each balancing circuit, A

physical signal | scalar or vector

Current, in amperes, flowing through the balancing circuit connected to each parallel assembly of the battery, specified as a scalar if the Number of balancing circuits is 1, or a vector otherwise. The size of this vector must be equal to the value of the Number of balancing circuits parameter.

Output

Vbat — Voltage across each balancing circuit, V

physical signal | scalar or vector

Voltage, in volts, across the balancing circuit connected to each parallel assembly of the battery, returned as a scalar if the Number of balancing circuits is 1, or a vector otherwise. The size of this vector is equal to the value of the Number of balancing circuits parameter.

Conserving

+ — Positive terminal

electrical array of nodes

Electrical array-of-nodes conserving port associated with the positive terminal of the interface. The size of this port is equal to the value of the Number of balancing circuits parameter.

If you create a block using the ParallelAssembly, Module, ModuleAssembly, or Pack objects, set the BalancingStrategy property to "External" and connect this port to the +BUS port of the battery generated block.

- — Negative terminal

electrical array of nodes

Electrical array-of-nodes conserving port associated with the negative terminal of the interface. The size of this port is equal to the value of the Number of balancing circuits parameter.

If you create a block using the ParallelAssembly, Module, ModuleAssembly, or Pack objects, set the BalancingStrategy property to "External" and connect this port to the -BUS port of the battery generated block.

Parameters

To edit block parameters interactively, use the Property Inspector. From the Simulink^® Toolstrip, on the Simulation tab, in the Prepare gallery, select Property Inspector.

Number of balancing circuits — Number of balancing circuits

1 (default) | positive scalar

Number of balancing circuits that the interface connects to. The value of this parameter affects the size of all ports of this block and must be equal to the number of parallel assemblies in the battery or to the total number of series connections.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2024a