What is Battery Management System?
- When using high-efficiency, energy-dense lithium-ion batteries, control by BMS (Battery Management System) / BMU (Battery Management Unit) is necessary for safe and effective use due to the risk of ignition and smoking.
- It eliminates and balances voltage differences between cells (single batteries) connected in series within a battery module (battery assembly).
- Measures the cell voltage, current, and temperature of the battery module, and if they exceed the specified ranges, disconnects the output terminals to protect against overcharge, overdischarge, overcurrent, etc.
- Controls power supply by measuring remaining battery charge.
What is a cell?
A cell is an individual battery, also called a single cell. By connecting multiple cells together, their size can be increased to make a battery module, thereby increasing the amount of power supplied. Individual cells are mainly used in mobile devices and other devices with relatively low energy consumption.
What is a battery module?
Battery modules consist of multiple individual batteries called cells that are connected together. Battery modules are available in a variety of configurations and sizes depending on the intended use. They are mainly used as power sources for small electronic devices and transportation vehicles such as automobiles and airplanes.
Features
【Basic Functions】
Voltage monitoring function
Measures and monitors the voltage of each cell
- Over-charge (high voltage) detection (threshold value can be set)
- Over-discharge (low voltage) detection (threshold value can be set)
Temperature monitoring function
Measurement/monitoring by thermistor connected to board
(Standard connection is assumed to be SEMITEC 103AT or equivalent)
- High temperature detection (threshold value can be set)
- Low temperature detection (threshold value can be set)
Current Monitoring Function
Measurement/monitoring by current sensor connected to the board
(Standard assumes connection of LEM HASS-100)
- Charging overcurrent detection (threshold value can be set)
- Discharge overcurrent detection (threshold value can be set)
セCell balancing function
Adjusts voltage balance between cells
RS485 communication function
For communication with host system (Modbus RTU)
【Balancing method】
The passive balancing method is used to balance the voltage between cells of the battery module.
Passive balancing method
The voltage of individual cells in a battery module is balanced to the same voltage by discharging only the cells with high prominent voltages.
Goiku Battery’s BMS (Battery Management System) maximizes the use of battery modules and realizes a “safe” and “secure” operating environment.
【モジュール接続例】
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BMS Features
- Ensure safe and maximum utilization of the available voltage range of the battery module.
- Manage the battery module’s voltage, current, and temperature to ensure that it can be used within the proper range.
- Protects the battery module from overcharging and over discharging.
- Customized BMS (Battery Management System) to meet your specific requirements.
Example of g-BMS uses.
Electric Vehicles
Compact Mobility
Reusable Batteries
Household Batteries
Introduction to g-BMS
Four improvements over our previous BMS
- Improved cell voltage measurement speed
- Increase in the number of cells that can be handled per unit: ・・・3 cells → 15 cells a five-fold increase
- Miniaturization of the substrate 100mm×70mm
- Various parameters can now be set by the user
Various parameters can be set from a PC application by connecting the g-BMS configuration port to a PC USB port via USB-UART interface.
Main Features
- Target battery：Lithium-ion battery (nominal voltage 3.2V to 3.8V)
- Maximum number of cells per board:：15cells (minimum 3 cells)
- Multiple boards can be daisy chained：up to 32 boards
- Equipped with passive balancing
- Temperature sensor (thermistor) ）connectable：max. 2
- Current sensors can be connected
