Battery Current Monitoring

Monitor for battery current

Since R2022b

• 

Libraries:
Simscape / Battery / BMS / Protection

Description

The Battery Current Monitoring block implements battery overcurrent monitoring. Overcurrent protection is necessary in electrical circuits. A battery that is exposed to overcurrent experiences a considerable increase in cell temperature and is in a dangerously unstable state.

You can switch between continuous and discrete implementations of the block by using the Sample time (-1 for inherited) parameter. To configure the block for continuous time, set the Sample time (-1 for inherited) parameter to 0. To configure the block for discrete time, set the Sample time (-1 for inherited) parameter to a positive, nonzero value, or to -1 to inherit the sample time from an upstream block.

This diagram shows the structure of the block:

Equations

This block computes the overcurrent symptom with this equation:

$$OvercurrentSymptom=\left(i-Chargelimit\right)>ErrorLimit\parallel \left(DischargeLimit-i\right)>ErrorLimit.$$

The Battery Current Monitoring block then passes the overcurrent symptom to a Fault Qualification block, which qualifies the error.

Examples

Battery Monitoring

Use battery management system blocks to monitor the current and temperature of a battery. A random current and temperature profile is applied to the battery which is then simulated for 6 hours.

• Open Model

Ports

Input

PackCurrent — Battery pack current, A

scalar

Battery pack current, in ampere, specified as a scalar.

ChargingLimit — Charging current limit, A

scalar

Charging current limit of the battery, in ampere, specified as a scalar.

DischargingLimit — Discharging current limit, A

scalar

Discharging current limit of the battery, in ampere, specified as a scalar.

Output

OvercurrentError — Indication of overcurrent error

0 | 1

Indication of an overcurrent error. If this output is equal to 1, the battery is in an overcurrent state.

Parameters

Current error limit (A) — Current error limit

0 (default) | nonnegative scalar

Threshold to allow small deviation from the charging and discharging limits, in ampere.

Qualification time (s) — Error qualification time

2 (default) | positive scalar

Time required to qualify the error, in seconds.

Disqualification time (s) — Error disqualification time

0 (default) | nonnegative scalar

Time required to disqualify the error, in seconds. If you set this parameter to 0, the block does not disqualify the error.

Sample time (-1 for inherited) — Block sample time

-1 (default) | 0 | positive integer

Time between consecutive block executions. During execution, the block produces outputs and, if appropriate, updates its internal state. For more information, see What Is Sample Time? and Specify Sample Time.

For inherited discrete-time operation, specify this parameter as -1. For discrete-time operation, specify this parameter as a positive integer. For continuous-time operation, specify this parameter as 0.

If this block is in a masked subsystem or a variant subsystem that allows you to switch between continuous operation and discrete operation, promote the sample time parameter. Promoting the sample time parameter ensures correct switching between the continuous and discrete implementations of the block. For more information, see Promote Block Parameters on a Mask.

Algorithm data type — Option to choose data type for block algorithm

Inherit: auto (default) | double | single | <data type expression>

Since R2025a

Option to choose the data type for the block algorithm, specified as one of these values:

• Inherit: auto — You can simulate the block in both single and double precision. You must explicitly provide the inputs and parameters as either single or double.

• double — The block algorithm casts all inputs and parameters to double data type.

• single — The block algorithm casts all inputs and parameters to single data type.

• <data type expression> — The block algorithm casts all inputs and parameters to the data type object you specify.

Click the Show data type assistant button to display the Data Type Assistant, which helps you set the data type attributes. For more information, see Specify Data Types Using Data Type Assistant and Control Data Types of Signals.

Extended Capabilities

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

Version History

Introduced in R2022b

R2025a: Switch between single-precision and double-precision floating-point simulation using Algorithm data type parameter

You can now easily switch between single-precision and double-precision floating-point simulation of the block algorithm by using the Algorithm data type parameter.