Views: 1 Author: Site Editor Publish Time: 2024-04-11 Origin: Site
Lithium battery protection board(BMS) is the core component of an intelligent management system for lithium-ion batteries. Its main functions include overcharge protection, over discharge protection, over temperature protection, over current protection, etc., to ensure the safe use of the battery and extend its service life. With the rapid development of the new energy market, lithium batteries have been widely used due to their high energy density, no memory effect, and other advantages. Lithium battery protection plates, as their safety guards, have also received increasing attention and research.
Lithium battery protection board is usually composed of electronic components such as microcontroller, MOS transistor, resistor, capacitor, etc. Its working principle is mainly based on real-time monitoring and control of parameters such as voltage and current of the battery. When the voltage and current of the battery exceed or fall below the set threshold, the microcontroller will send a control signal to turn on or off the MOS transistor, thereby achieving charge and discharge control of the battery.
1. Overcharge protection: When the battery is charged to the set voltage, the protection board will automatically cut off the charging circuit to prevent the battery from overcharging.
2. Over discharge protection: When the battery is discharged to the set voltage, the protection board will automatically cut off the discharge circuit to prevent the battery from over discharging.
3. Over temperature protection: When the battery temperature is too high or too low, the protection board will automatically cut off the charging and discharging circuit to prevent the battery from being damaged due to abnormal temperature.
4. Overcurrent protection: When the charging and discharging current of the battery is too high, the protection board will automatically cut off the charging and discharging circuit to prevent the battery from being damaged due to excessive current.
The application scenarios of lithium battery protection boards are becoming increasingly widespread with the rapid development of new energy electric vehicles, drones, mobile power sources, and other fields. In these fields, lithium battery protection boards play a crucial role in ensuring the safe operation of equipment and the safety of users' lives and property.
The important technical parameters of lithium battery protection board include overcharge protection, over discharge protection, overcurrent protection, short circuit protection, temperature protection, internal resistance, power consumption, etc.
1. Overcharge protection: overcharge detection voltage, overcharge detection delay time, overcharge release voltage.
2. Over discharge protection: Over discharge detection voltage, Over discharge detection delay time, Over discharge release voltage.
3. Overcurrent protection: charging overcurrent protection current, charging overcurrent detection delay time, charging overcurrent release delay time, discharging overcurrent protection current, discharging overcurrent detection delay time, discharging overcurrent release delay time.
4. Short circuit protection: protection conditions, external circuit short circuit, detection delay time, protection release delay time.
5. Temperature protection: There is an interface and a recoverable temperature protection switch needs to be installed.
6. Internal resistance: It is related to the type and capacity of the battery and is one of the important parameters for evaluating battery performance.
7. Power consumption: including static power consumption and maximum working current, where static power consumption refers to the electrical energy consumed by the circuit itself without any load on the protection board; The maximum working current refers to the maximum current allowed by the protection board while ensuring the safety of the battery.
In addition, balancing current and balancing starting point are also important parameters for lithium battery protection boards. Balanced current represents the average operating current of each battery cell in the battery pack; The equilibrium starting point indicates that the voltage difference between each battery cell in the battery pack cannot exceed a certain set value.
The selection of these parameters will affect the working effect and safety of the lithium battery protection board, so in practical applications, it is necessary to choose and configure according to specific needs.
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