Battery Management Systems
Battery Management Systems for battery pack
Unlike traditional batteries, Li-ion battery systems require a battery management system (BMS) to ensure safe operation and protect the life of the battery pack. The BMS can be incorporated into each module, or be external to manage a number of modules in a pack. We incorporate protective electronics to monitor the temperature and voltage of each cell within the module. The external BMS / Controller monitors the health and state of charge of the entire battery pack, and takes the necessary corrective action to ensure long life for the battery pack. In addition, the BMS / controller collects and reports performance data and can control contactors and fans.
Balancing Lithium-ion Batteries
With the high energy of Lithium-ion batteries, extra care needs to be taken to make sure the batteries in a pack are balanced, not only upon initiation of the pack, but throughout the charge and discharge cycles. Lithium batteries do not inherently dissipate excess charge, so the BMS must monitor and control them to stay in balance. Our BMS automatically balances the cells when in operation.
Coremax owned a battery design, research and development team with rich experience and pay attention to batteries in all aspects. It providing customers with the latest, advanced and safest mobile power solution. Coremax equipped with State-of-the-art manufacturing equipment and precise detection instruments and computer monitoring equipment. With the strict accordance on the quality management system, Coremax battery always ensure the performance of security and stability to meet customers’ requirements.
Solar energy storage BMS
Coremax pays much more attention to the details and management to maintain a good reputation from customer. With the excellent quality and reliability, Coremax works for several top 500 enterprises customers and we are proud of the positive feedback and closely co-operation from them. Up to now, coremax has already developed thousands of various lithium battery cells battery packs based on customers’ detailed requirements and applications. With a wide range, good quality, reasonable prices and stylish designs
Coremax ESS BMS Function Description
Cell and Battery Voltage Monitoring:
Real-time collection and monitoring of the voltages of series-connected cells to achieve over-voltage and under-voltage warnings and protection. Voltage detection accuracy for cells is ±10mV under conditions of 0°C to 45°C and ±20mV under conditions of -20°C to 70°C. Alarm and protection parameter values can be modified through upper computer software.
Battery Charge and Discharge Current Detection:
Over-current warnings and protection for battery pack charge and discharge currents, as well as short-circuit protection detection for battery pack output. Real-time collection and monitoring of charge and discharge currents of the battery pack. Continuous charge and discharge currents of 100A with a temperature rise of less than 50°C and an accuracy better than ±1%. Alarm and protection parameter values can be modified through upper computer software.
Cell, Environment, and Power Temperature Detection:
Temperature detection for 4 cell temperatures, 1 environmental temperature, and 1 MOS temperature to achieve high-temperature and low-temperature warnings and protection. Temperature detection accuracy is ±2°C. A 10K thermistor with a B value of 3950 is used for cell temperature sensing.
Battery Capacity Calculation and Cycle Counting:
Real-time calculation of remaining battery capacity and completion of learning total capacity during charge and discharge cycles. State of Charge (SOC) estimation accuracy is better than ±5%. It includes cycle counting functionality; when the accumulated discharge capacity of the battery pack reaches 80% of the set full capacity, the cycle count is incremented.
Ampere-hour Integration for Accurate SOC Calculation:
Accurate calculation of battery SOC using ampere-hour integration. Supports open-circuit voltage static calibration method, as well as charge and discharge dynamic calibration methods for SOC correction.
Charge and Discharge MOSFET Switching Function:
Designed for low internal resistance, high current, and optimized for large-capacity load startup, zero switching, and high charging withstand voltage for backup power applications.
Battery Charging Balancing Function:
Flexible charging balancing strategy settings (activation voltage, balancing voltage) to effectively enhance battery usage time and cycle lifespan.
LED Indicator Status Function:
Equipped with 6 LED indicators: 4 for battery remaining capacity, 1 for operation status, and 1 for alarm protection status.
Button Switching Function:
Self-locking switch: Intelligent one-button switch design for manual startup in shutdown state and manual shutdown in any state. Reset and sleep buttons: Long-press the button for 3-6 seconds in non-backup power state to enter sleep mode, and long-press for 1-3 seconds in idle state to wake up.
RS485 and CAN Communication Function:
PC or FSU can use RS485 for remote telemetry, tele-indication, tele-adjustment, and tele-control commands to monitor, control, and set battery data in real-time, as well as monitor BMS and Pack status. Inverters or terminals can use CAN or RS485 communication to obtain battery status data and adjust their own output.
Upper Computer Control Function:
Ability to set various battery management parameters such as individual cell over/under-voltage, total battery over/under-voltage, charge over-current, discharge over-current, cell high/low temperature, environmental high/low temperature, balancing strategy, battery series cell count, battery capacity, etc. Can toggle discharge MOS, charge MOS, current limiting function switch, buzzer alarm switch, forced sleep switch, and enable online system software upgrade.
Hardware Voltage Detection Function:
BMS is equipped with unique hardware detection and protection circuitry to ensure safe and reliable long-term operation under abnormal conditions.
Historical Data Storage Function:
Includes historical data storage with a capacity of no less than 500 records, facilitating system monitoring, analysis, and maintenance.