18650 3500mah battery

　　What is the function of 18650 3500mah battery pack protection board management system?

　　What is the function of 18650 3500mah battery pack protection board management system? The 18650 3500mah battery pack protection board is very important. In the battery protection system, the lithium battery PACK design process must use the lithium battery protection board or the corresponding BMS to better design the lithium battery pack, and can even assist in analyzing abnormal batteries or circuits. . The 18650 3500mah battery pack protection board management system is of great significance to protect the safety of electric vehicles, charging station equipment and personnel. So what is the role of the 18650 3500mah battery pack protection board management system?

　　Working principle of 18650 3500mah battery pack protection board

　　The reason why lithium batteries need protection is determined by its own characteristics. Since the material of the lithium battery itself determines that it cannot be overcharged, overdischarged, overcurrent, short-circuited, or charged and discharged at ultra-high temperatures, lithium battery components always appear with a delicate protective board and a current fuse.

　　The BMS protection function of the lithium battery pack is usually completed by the protection circuit board and current devices such as PTC. The protection board is composed of electronic circuits and can accurately monitor the voltage and charge and discharge of the battery core at all times in an environment of -40°C to +85°C. The current of the loop can be controlled in time to make the current loop on and off; PTC can prevent severe damage to the battery in high temperature environments.

　　Ordinary lithium battery BMS protection boards usually include control IC, MOS switches, resistors, capacitors and auxiliary devices FUSE, PTC, NTC, ID, memory, etc. Among them, the control IC controls the MOS switch to turn on when everything is normal, so that the battery core is connected to the external circuit. When the battery core voltage or loop current exceeds the specified value, it immediately controls the MOS switch to turn off to protect the battery core. Safety.

　　18650 3500mah battery pack protection board management system function

　　The 18650 3500mah battery pack protection board can protect the battery from overcharge, overdischarge, overcurrent, short circuit and temperature protection.

　　●Overcharge protection: When the voltage of a certain string of the battery pack is greater than the (overvoltage) maximum value and the protection delay is reached, the IC controls the CMOS to shut down the charging circuit.

　　●Over-discharge protection: When the voltage of a certain string of the battery pack is less than the (under-voltage) maximum value and the protection delay is reached, the IC controls DMOS to turn off the discharge circuit.

　　●Over-current and short-circuit protection: When the output current of the battery pack P+ and P- exceeds the over-current/short-circuit current value and reaches the over-current/short-circuit delay, the control circuit controls the discharge DMOS to turn off the discharge circuit and stop discharging.

　　●High and low temperature protection: When the temperature sensor reaches the temperature threshold and reaches the protection delay, the control circuit controls to turn off the charge and discharge MOS tube and stop charging and discharging.

　　The 18650 3500mah battery pack protection board also has functions such as power detection, remaining capacity display, battery working status display, and communication remote control.

　　Introduction to 18650 3500mah battery pack protection functions

　　1. Battery protection is similar to PCM, including overcharge, over-discharge, over-temperature, over-current, and short-circuit protection.

　　2. Energy balance. Since many batteries are connected in series, the entire lithium battery pack will eventually show great differences after working for a certain period of time due to the inconsistency of the cells themselves, the inconsistency of the operating temperature and other reasons. The life of the battery and the use of the system have a huge impact. Energy balancing is to make up for the differences between individual cells and perform some active or passive charge or discharge management to ensure the consistency of the battery and extend the life of the battery.

　　3. SOC calculation. Due to the development of technology, many methods have been accumulated for SOC calculation. If the accuracy is not high, the remaining power can be judged based on the battery voltage. The most accurate method is the current integration method (also called Ah method), Q= ∫idt, as well as internal resistance method, neural network method, Kalman filter method, etc.

　　4. Communication. Different systems have different requirements for communication interfaces. The mainstream communication interfaces include SPI, I2C, CAN, RS485, etc. Among them, automotive and energy storage systems are mainly CAN and RS485.

　　⒌Balance between batteries: It is to charge the single lithium battery equally so that each battery in the battery pack reaches a balanced and consistent state. Balance technology is a key technology of battery energy management system that the world is currently researching and developing.

　　The 18650 3500mah battery pack protection board management system serves as a strong guarantee for the safe use of batteries, allowing the battery to be in a safe and controllable charging and discharging process at all times, greatly improving the cycle life of the battery in actual use. It is believed that in the future, relevant R&D staff will actively explore and continuously research new technologies to promote the upgrade of 18650 3500mah battery pack management systems and better meet people's living needs.

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