Research on conductive material of positive cap In the design...
The function of BMS
Perception and measurement Measurement
This is the basic function of BMS, including the measurement and calculation of some indicator parameters. There are voltage, current, temperature, electricity, state of charge (SOC), state of health (SOH), state of power (SOP), and state of energy (SOE).
SOC can be commonly understood as how much power is left in the battery, and its value is between 0 and 100%, which is the most important parameter in BMS; SOH refers to the health state (or degree of battery deterioration) of the battery, is the ratio of the actual capacity of the current battery to the rated capacity, when the SOH is less than 80%, the battery cannot be used in the power environment.
Alarm and protection
When the battery is abnormal, the BMS can report an alarm to the platform, protect the battery, and take corresponding measures. At the same time, the BMS sends the abnormal alarm information to the monitoring and management platform and generates alarm information of different levels.
For example, if the temperature is too high, the BMS will directly disconnect the charge and discharge loop, protect against overheating, and send an alarm to the background.
Lithium batteries mainly emit alarms for the following problems:
Overcharge: single overvoltage, total voltage overvoltage, charging overcurrent;
Overdischarge: monomer undervoltage, total voltage undervoltage, discharge overcurrent;
Temperature: cell temperature is too high, ambient temperature is too high, MOS temperature is too high, cell temperature is too low, ambient temperature is too low;
Status: flooded, collision, upside down, etc.
Balanced management
The need for balanced management comes from inconsistencies in the production and use of batteries.
From the production point of view, each battery has its own life cycle and characteristics, there is no identical two batteries, due to the diaphragm, cathode, anode and other materials are inconsistent, the capacity of different batteries can not be completely consistent. For example, each cell that forms a 48V/20AH battery pack has a certain range of differences in its consistency indicators such as pressure difference and internal resistance.
From the point of view of use, in the process of battery charging and discharging, the process of electrochemical reaction is never consistent. Even if it is the same battery pack, the amount of battery charge will be different because of the different temperature and bump degree, resulting in inconsistent cell capacity.
Therefore, the battery needs both passive and active balance. That is, set a pair of thresholds for starting and ending equalization: for example, in a group of batteries, the difference between the extreme voltage of a single unit and the average voltage of this group reaches 50mV to start equalization, and 5mV to end equalization.
Communication and positioning
BMS has a separate communication module for data transmission and battery positioning, which can transmit the perceived and measured relevant data to the operation management platform in real time.
Home energy storage product series
A lithium battery pack for home energy storage systems, which is compatible with solar panels and the sun The inverter can work together with the power grid to power household appliances, and it can also be used as a For off grid systems.
Extended reading
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