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BatteryWatch™ BMS

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BatteryWatch™ Battery Management System

UtiliCell’s EnergyBLOX™ come standard with our advanced BatteryWatch™ Battery Management System (BMS). This sophisticated voltage and measurement system controls the charging and discharging of the storage batteries. A wide variety of system parameters are tracked and stored to ensure the health and history of every battery cell, overall performance and accurate forward-looking predictions can be developed from the data. BatteryWatch™ protects and optimizes the battery by protecting the battery from operating outside its Safe Operating Area, monitoring its state, calculating secondary data, reporting that data, controlling its environment, authenticating it and / or balancing it. BatteryWatch™ also performs Thermal Management. Thermal management of lithium-ion battery systems is critical to success because extreme temperatures can affect battery performance, reliability, safety and durability.

Battery State Monitoring

BatteryWatch™ monitors the state of the battery and includes items, such as:

  • Voltage: total voltage, voltages of individual cells, minimum and maximum cell voltage or voltage of periodic taps
  • Temperature: average temperature, coolant intake temperature, coolant output temperature, or temperatures of individual cells
  • State of charge (SOC) or depth of discharge (DOD): to indicate the charge level of the battery
  • State of health (SOH), a variously-defined measurement of the overall condition of the battery
  • Coolant flow
  • Current: current in or out of each battery cell

Battery Computation

BatteryWatch™ calculates values based on the above items, such as:

  • Maximum charge current as a charge current limit (CCL)
  • Maximum discharge current as a discharge current limit (DCL)
  • Energy [kWh] delivered since last charge or charge cycle
  • Internal impedance of a cell(to determine open circuit voltage)
  • Charge [Ah] delivered or stored ("Coulomb counter")
  • Total energy delivered since first use
  • Total operating time since first use
  • Total number of cycles

Battery Protection

BatteryWatch™ prevents operation outside the battery's safe operating area by:

  • Over-current (may be different in charging and discharging modes)
  • Over-voltage (during charging)
  • Under-voltage (during discharging)
  • Over-temperature
  • Under-temperature
  • Over-pressure

BatteryWatch™ protects the batteries by preventing them from operating outside the safe operating area, such as:

  • Including an internal switch which is opened if the battery is operated outside its safe operating area
  • Requesting the devices to which the battery is connected to reduce or even terminate using the battery
  • Actively controlling the environment through temperature regulation equipment

Battery Optimization

In order to maximize the battery's capacity, and to prevent localized under-charging or over-charging, BatteryWatch™ actively ensures that all the cells that compose the battery are kept at the same voltage or State of Charge, through balancing. The BMS can balance the cells by:

  • Shuffling energy from the most charged cells to the least charged cells (balancing)