Factors to consider in wiring and design of lithium iron phosphate battery pack protection board. The lithium battery pack protection board is composed of electronic components and PCB. It is always ready to monitor the voltage of the battery cell and the current of the charging and returning circuit in a certain temperature and humidity environment. Today, the editor will explain to you the relevant knowledge of the lithium iron phosphate battery pack protection board from a professional perspective, including: the wiring connection method and design considerations of the lithium battery protection board.

　　Lithium battery protection board:

　　Battery protection board, as the name suggests, the lithium battery protection board is mainly an integrated circuit board that protects rechargeable (generally lithium batteries). The reason why lithium battery (rechargeable type) needs 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, the lithium battery component will always be accompanied by a protection board with a sampling resistor and a current fuse.

　　Working process of lithium iron phosphate battery pack protection board:

　　When the cell voltage is between 2.5V and 4.3V, both pins 1 and 3 of DW01 output high level (equal to the supply voltage), and the voltage of the second pin is 0V. At this time, the voltage of pins 1 and 3 of DW01 will be added to pins 5 and 4 of 8205A respectively. The two electronic switches in 8205A are in a conductive state because their G pole is connected to the voltage from DW01, that is, Both electronic switches are on. At this time, the negative electrode of the battery core is directly connected to the P- terminal of the protective plate, and the protective plate has a voltage output.

　　The design of the lithium iron phosphate battery pack protection board should consider the following points:

　　A. The design of the lithium iron phosphate battery pack protection board must ensure reliability and working stability. Overcurrent parameters retain a technical margin of at least 30%.

　　B. The designed product should be easy to test.

　　C. The design of the lithium battery pack protection board should be convenient for production and debugging, and the process should be simplified.

　　D. Lithium iron phosphate battery products should be easy to install.

　　E. The design of lithium battery pack must meet the size requirements.

　　F. The design should facilitate the procurement of components. The device used cannot be too special.

　　G. Cost should be considered in the design of lithium battery protection board.

　　H. The design should fully consider heat dissipation and the placement of heat dissipation components.

　　Several wiring methods for lithium iron phosphate battery protection board:

　　The third line of some lithium-ion batteries is a temperature protection line, and some is a battery information verification line. Lithium iron phosphate battery packs are both batteries + protection boards. The 3 wires will only appear on the protection board, and the battery will always only have 2 wires. There are two types of lithium-ion batteries. Obviously the 3.7V one is non-aluminum iron phosphate and can be replaced directly. The connection methods of lithium battery protection boards are generally three types of commonly used protection boards: negative pole with port plate, negative pole split port plate, and positive pole with port plate.

　　Replacement is very simple (pay attention to the positive and negative poles):

　　Remove the original battery packaging and use a soldering iron to separate the protective plate and battery.

　　Similarly, remove the protective plate of your new battery and connect the lithium iron phosphate battery to the old protective plate.

　　How to repair the lithium battery pack protection board?

　　First check the parameters of the lithium iron phosphate battery pack: the normal range is 2.8~4.25, and the lithium iron battery is 2.5~3.65V.

　　1. It may be due to voltage overcharge, over-discharge, over-current, short circuit, or over-temperature.

　　2. Use a multimeter to check whether the charging and discharging MOS tube is open.

　　3. If the lithium battery pack protection board is equipped with LED and cannot be charged or discharged, the LED will flash for 0.5 seconds and an alarm will sound.

　　4. If the lithium battery protection board is attached to the host computer, you can connect to the host computer to check the protection status.

　　5. The lithium battery protection board is equipped with a weak point switch. Please check whether the weak point switch is turned on.

　　If these situations occur, you can check the following repair methods:

　　●Insert the charger to recover from overcharge, overdischarge, overcurrent, and short circuit.

　　●Overcurrent disconnection load recovery

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