Introduction to technical indicators of 21700 battery protection board

Technical indicators of lithium-ion battery protection board

1. Voltage protection capability

Overcharge protection: The lithium-ion battery protection board must have the ability to prevent the battery cell voltage from exceeding the preset value Over-discharge protection: The protection board must have the ability to prevent the battery cell voltage from being lower than the preset value

2. Current capability

As a safety protection device for lithium batteries, the protection board must be able to work reliably within the normal working current range of the equipment, and must be able to act quickly when the battery is accidentally short-circuited or overcurrent occurs, so that the battery cell is protected.

3. On-resistance

Due to the high operating frequency of communication equipment, data transmission requires a low bit error rate, and the rising and falling edges of its pulse train are steep, so the current output capacity and voltage stability of the battery are required to be high. Therefore, the MOS tube switch of the protection board should have a small resistance when it is turned on. The single-cell protection board is usually <70m. 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, and noise.

4. Self-consumption current

Meaning: The working voltage of the IC is 3.6V. Under no-load conditions, the working 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-ion battery. It is usually stipulated that the self-consumption current of the protection board is less than 10 microamperes.

5. Mechanical properties, temperature adaptability, and anti-static ability

The lithium-ion 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 a non-contact ESD static test of ±15KV.

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