Batteries & Battery Management Systems

Our modular battery management software (BMS) is designed for Li-ion cell chemistries. Its unique composition allows packs of different sizes, power outputs and capacities to be accurately monitored and controlled.

The BMS has been specifically designed to be be adaptable, allowing it to accommodate cell chemistries from different cell suppliers which may have alternative operating characteristics.


 
We provide expert assistance to our customers to help them select cells that are tailored to their individual requirements, which are commonly based upon:

  • Power demand
  • Energy demand
  • „„Packaging constraints
  • „„Safety
  • „„Price
  • „„Availability
  • „„Charging time
     

 BMS Software Capabilities


Battery Condition Estimation Thermal Management BMS Monitoring Performance Forecasting Fault Reporting
High-Accuracy State of Charge calculation with drift correct
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Active State of Health estimation based on cell characterisation results
Liquid cooling: coolant temp and flow rate control
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Air cooling: active fan speed control
State of Charge & State of Health
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Cell voltage, temperature, resistance and capacity
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Battery current
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DC link voltage
„Charge and discharge available power prediction
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Charge and discharge current and voltage limits
100+ fault codes available
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Multiple levels: warning, power reduction, hard shutdown
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Fault log
„„Protection  Additional Features  Contactor Management Communication Interface
Fault management
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Cell temperature hardware Interlocks
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High voltage interlock
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Active isolation fault detection
Low power dissipation
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Weak cell detection
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Fuse blow detection
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Support multiple high voltage
interlock loops
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Key parameters logged over life time for usage analysis
 Positive and negative contactor
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Pre-charge contactor
CAN 2.0b – SAE J1939 protocol
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Customer specific

 

Key features:

  • Available power prediction
  • „„High-Accuracy State of Charge calculation with Drift Correct
  • „„Active State of Health estimation
  • „„Cell monitoring
  • „„Protection and fault management
  • „„Thermal management
  • „„Communications interface
  • „„Diagnostics

The software contains our unique ‘cell characterisation’ method, that allows the application to extract as much energy from the pack as possible without compromising its safety and lifespan. By applying this method we have also been able to significantly reduce battery pack weight, size and cost.

The BMS has been successfully integrated into number of customer applications, ranging from performance HEVs to B-Segment EV, LCVs and HEV busses.

 

Cell Characterisation and BMS Optimisation

We have developed a unique approach to our BMS which results in improved performance and reduced weight.

We have developed a unique approach to our BMS which results in improved performance and reduced weight By including our cell characterisation in the BMS we can provide the following;
Predict available battery power in real time Hybrid powertrain controller can use this information to improve torque management
Improved State of Charge (SoC) calculations Improve accuracy and provide SoC drift correction based on temperature and load current
Improved State of Health (SoH) calculations BMS is able to compare actual measured performance with respect to Beginning of Life (BOL) performance