How to activate and connect the lithium iron battery protection board. Due to the activity of lithium ions, when using lithium iron batteries, a protective plate must be used to prevent overcharge, overdischarge, and overcurrent of the lithium battery. The connection method of the lithium battery protection board is different for each company, because there are positive lithium battery protection boards and negative lithium battery protection boards. For lithium battery protection boards, there are software boards and hardware boards that people often say are actually the same.

　　How to activate the lithium iron battery protection board

　　Now not all lithium iron battery protection boards need to be activated, but some protection ICs need to be activated, and this is an old IC solution. The old IC solution needs to be done so that the protection board does not work to reduce the risk of Electrostatic discharge energy allows lithium batteries to be stored longer. This is why the design requires charge activation.

　　If the protection board is protected by current limiting, it may need to be activated by charging or completely disconnecting the load, which is relatively troublesome. However, you can also short-circuit B- (battery negative) and P- (discharge negative). The protection will be released. Remember not to carry a large load when the short circuit is touched (such as turning the bar and twisting it all the time), otherwise there may be big sparks. The fundamental reason for this is that a large voltage difference is formed between the two ends of the discharge MOS after protection. , a short-circuit touch will directly reset the D-S level of the discharge MOS to 0V, and the protection will be released at this moment.

　　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 each single cell is less than the set value (generally ±20mV), achieving even charging of each single cell in the battery pack. , effectively improving the 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 iron battery pack are detected to protect and extend the service life of the battery; undervoltage protection prevents each single cell from being discharged and used due to battery failure. Damaged due to over-discharge.

　　The finished lithium battery mainly consists of two parts, the lithium battery core and the protective plate. The lithium battery core is mainly composed of positive plate, separator, negative plate, and electrolyte; the positive plate, separator, and negative plate are wound or laminated, packaged, and filled with electrolyte , it is made into a battery core after packaging.

　　When the battery is being charged, if the charging circuit loses control, constant current charging will continue after the voltage exceeds a certain value, and the battery voltage will continue to rise, which may cause battery damage or safety issues. When there is a protective plate in the lithium iron battery, the overcharge protection function of the protective plate will be activated and the MOS tube will be cut off to prohibit charging of the battery pack to protect the safety of the battery.

　　Wiring method of iron lithium battery protection board

　　Decomposition of the connection method of the lithium battery protection board: To first know the connection method of the lithium iron battery protection board in more detail, then you need to know some basic working principles of the components and protection board on the lithium battery protection board, which will help you understand The working principle of the lithium battery circuit board can better use the iron lithium battery circuit board to connect the battery pack.

　　① Before connecting the cable, make sure that the cable is not inserted into the protective plate;

　　②Weld the B-line (thick blue line) of the protective plate to the total negative electrode of the lithium iron battery;

　　③The wiring starts from the thin black wire connecting B-, the second wire is connected to the positive terminal of the first string of batteries, and then the positive terminal of each string of batteries is connected in turn, until the last string B+;

　　④After the cable is connected, do not insert the plug directly into the protective plate. Measure the voltage between each two adjacent metal terminals on the back of the plug. If it is a ternary polymer battery, the voltage should be between 2.8 and 4.2V, and for lithium iron battery, it should be between 2.5 and 2.5V. ~3.65V, lithium titanate battery should be between 1.6~2.8V;

　　⑤ After confirming that the wiring sequence and voltage of the cables are correct, insert them into the protection board socket.

　　Generally speaking: P+ and P- are connected to the output. B+ is connected to the positive electrode of the battery, and B- is connected to the negative electrode. If multiple cells are connected in series, the negative electrode of B1 and the positive electrode of B2 are connected together, and so on, the negative electrode of the last battery is connected to Bn-. Solder the wires first, and finally connect the lithium-iron battery. Do not connect them incorrectly. If there is no output after completion, remember to use the charger to activate the charging interface led by P+ and P-.

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