Why use a battery management system?
The BMS measures the current and voltage of the battery cells and sends the information to the state of charge SOC application system to determine the operating state of the battery. After a period of use, the actual maximum capacity of the battery will decrease. Measurements from the BMS can calculate the actual maximum capacity of the battery, help the system determine the battery's state of health (SOH) and remaining useful life (RUL), estimate whether the battery is still working or needs to be replaced, and can enable additional battery optimization features . By determining the SOC and SOH conditions of each cell, the BMS can balance the charge and discharge operations of the cells to ensure uniform loss across all cells, resulting in longer battery life and higher performance.
1. Pay attention to the accuracy and speed of measurement
understand accuracy
Power battery packs in electric vehicles
Engineers have historically focused first on the measurement accuracy of the BMS. If the system measurement data is inaccurate and lacks valuable information, users will experience huge frustration. Therefore, when the BMS measures the status of each battery cell, the accuracy must be very high, and the speed must also be very fast, otherwise, when the chip has finished reading the last cell of the battery pack, the report measurement of the first cell The value is no longer accurate, and the application system cannot provide a true reflection of the battery state of charge.
Know the actual capacity of each battery cell. Ensure that each battery cell has dedicated resources for processing the electrical data monitored by the chip, while similar products on the market usually share data processing resources among battery cells. By providing dedicated processing resources for each cell,
2. Battery management system: Pay attention to safety, this is the top priority
Learn about security
BMS security is often overlooked by many designers. The measurement accuracy of the BMS system helps improve battery performance and can also determine if there is overvoltage and undervoltage on the battery, or if overheating or overcurrent is present. For example, in the event of a collision, an electric vehicle must be able to determine that the battery parameters are not within normal safe values, and immediately initiate a battery shutdown procedure, otherwise catastrophic losses will result.
unique redundancy
These functions require the chip to be highly robust and work well even in harsh environments. It is also important to prevent false readings, which can be very dangerous when the car is cruising at high speed and can cause the battery pack to shut down
All engineers try to design their products with the future in mind, however, when it comes to battery management systems, the design must take into account not only the cars of tomorrow, but also all new products that are currently using BMS, such as e-bikes and scooters, or Portable medical equipment, etc.
