402030 polymer battery.Introduction to IC parameters and technical indicators of lithium battery protection board

　　Introduction to IC parameters and technical indicators of lithium battery protection board. Lithium batteries are mainly composed of two large parts, the battery cell and the protective plate PCM. The function of the protective board is mainly to protect the cells of rechargeable batteries, maintain the safety and stability of the lithium battery during charging and discharging, and play an important role in the performance of the entire battery circuit system.

　　Lithium battery protection board IC parameters

　　1. Main parameters of lithium battery protection IC

　　1)Package

　　2) Overcharge voltage

　　3) Overcharge release voltage

　　4) Over-discharge voltage

　　5) Over-discharge release voltage

　　6) Pressure resistance

　　2. Main parameters of MOSFET

　　1)N groove, P groove

　　2) Internal resistance

　　3) Packaging (TSSOP8 , SOP8 , SOT23-6, etc.)

　　4) Current resistance

　　5)Withstand voltage

　　6) Whether it is internally connected

　　Main technical indicators of lithium battery protection board

　　1. Voltage protection capability

　　Overcharge protection: The lithium battery protection board must have the ability to prevent the cell voltage from exceeding the preset value. Overdischarge protection: The protection board must have the ability to prevent the cell voltage from falling below the preset value.

　　2.Current capability

　　As a safety protection device for lithium batteries, the protective board must not only work reliably within the normal operating current range of the equipment, but also act quickly when the battery is accidentally short-circuited or overcurrent to protect the battery core.

　　3. On-resistance

　　Since the working frequency of communication equipment is high, data transmission requires a low bit error rate, and the rising and falling edges of its pulse train are steep, so the battery's current output capability and voltage stability are required to be high, so the MOS tube switch of the protection board is turned on. The resistance should be small, and the single cell protection plate is usually <70mΩ. If it is too large, it will cause the communication equipment to work abnormally, such as the mobile phone suddenly disconnecting during a call, the phone cannot be connected, noise, etc.

　　4. Self-consumption current

　　Definition: The operating voltage of the IC is 3.6V. In the no-load state, the operating current flowing through the protection IC is generally very small. The self-consumption current of the protection board directly affects the standby time of the lithium battery. The self-consumption current of the protection board is usually specified. Less than 10 microamps.

　　5. Mechanical properties, temperature adaptability, and antistatic ability

　　The lithium battery protection board must be able to pass the vibration and impact tests specified by the national standard; the protection board can work safely at -40 to 85 degrees, and can withstand the non-contact ESD static test of ±15KV.

　　The role of lithium battery protection board

　　The lithium battery protection board is to protect the charge and discharge of the series-connected lithium battery pack; when fully charged, it can ensure that the voltage difference between the individual cells is less than the set value, achieving even charging of each individual cell in the battery pack, effectively improving Charging effect in series charging mode;

　　At the same time, the overvoltage, undervoltage, overcurrent, short circuit, and overtemperature status of each single cell in the lithium battery pack are detected to protect and extend the service life of the battery; the undervoltage protection prevents each single cell from being discharged and used due to overheating. Damaged by discharge.

　　Because the parameters of lithium batteries are also different, the corresponding types of protective plates are also different. Generally speaking, lithium batteries generally have a corresponding lithium battery protection board to assist in their work. Because lithium batteries need to work under normal current and voltage, if the instantaneous current is too large due to short circuit or other reasons, it will directly damage the cells of the lithium battery, and the consequences are very dangerous, ranging from light to explosive. .

Read recommendations:

701224 145mAh 3.7V

Lithium power battery storage method.3.7V 18650 lifepo4 battery

Safety Evaluation of Lithium Battery Electrolytes

801738 battery

602535 polymer battery