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) Overdischarge voltage 5) Overdischarge release voltage 6) Withstand voltage 2. MOSFET main parameters 1 )N channel, P channel 2) Internal resistance 3) Package (TSSOP8 , SOP8 , SOT23-6, etc.) 4) Current resistance 5) Voltage resistance 6) Whether the lithium battery protection board is internally connected is mainly Technical indicators 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. Over-discharge 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: Because the working frequency of communication equipment is high, the data transmission requires a low bit error rate, and the rising and falling edges of the pulse train are steep, so the current output capability and voltage stability of the battery are required to be high, so the protection board When the MOS tube switch 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. Definition of self-consumption current: 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, and protection is usually specified. The self-consumption current of the board is less than 10 microamps. 5. Mechanical properties, temperature adaptability, and anti-static 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 the 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 an even balance of the individual cells in the battery pack. charging, effectively improving the charging effect in series charging mode; simultaneously detecting the overvoltage, undervoltage, overcurrent, short circuit, and overtemperature status of each single cell in the lithium battery pack to protect and extend the battery life; undervoltage protection This prevents each single battery from being damaged due to over-discharge when it is being discharged. Because the parameters of lithium batteries are 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. . The function of the lithium battery protection board is to avoid a series of unexpected situations such as short circuit, so the parameter requirements of the protection board are also extremely precise.

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