Lithium battery protection board is the charge and discharge protection for the series lithium battery pack; when fully charged, it can ensure that the voltage difference between each unit battery is less than the set value (generally ±20mV), and realize the equalization of each unit of the battery pack. , effectively improving the charging effect in the series charging mode; simultaneously detecting the overvoltage, undervoltage, overcurrent, short circuit, and overtemperature conditions of each single cell in the battery pack, protecting and extending the battery life; undervoltage protection enables each A single battery prevents damage to the battery due to overdischarge during discharge.
The finished lithium battery consists mainly of two major parts, a lithium battery core and a protective plate. The lithium battery core is mainly composed of a positive electrode plate, a separator, a negative electrode plate and an electrolyte; the positive electrode plate, the separator and the negative electrode plate are wound or laminated, packaged, and poured into the electrolyte. After the package is made into a battery core, the role of the lithium battery protection board is not known to many people. The lithium battery protection board, as the name implies, is used to protect the lithium battery. The role of the lithium battery protection board is to protect the battery but not charge it. Stream, there is output short circuit protection.
Equilibrium current: 80mA (when VCELL=4.20V)
Equilibrium control point: 4.18±0.03 V overcharge threshold: 4.25±0.05 V (4.30±0.05 V optional)
Over-discharge threshold: 2.90±0.08 V (2.40±0.05 V optional)
Over discharge delay: 5mS
Over discharge release: disconnect the load, and each cell voltage is higher than the over-discharge threshold;
Overcurrent release: disconnect load release
Over temperature protection: There is an interface, and a recoverable temperature protection switch needs to be installed;
Working current: 15A (according to customer choice)
Static power consumption: "0.5mA
Short-circuit protection function: It can protect and disconnect the load and recover itself.
Main functions: overcharge protection function, over discharge protection function, short circuit protection function, over current protection function, over temperature protection function, balanced protection function.
Interface definition: The charging port and the discharging port of the board are independent of each other, the two are common to the positive pole, B- is the negative pole connecting the battery, C- is the negative pole of the charging port; P- is the negative pole of the discharging port; B-, P-, C - The pads are all via type, and the pad holes are all 3 mm in diameter; the battery charge detection interfaces are output in the form of DC pins.
Parameter description: Configuration of maximum working current and overcurrent protection current value, unit: A (5/8, 8/15, 10/20, 12/25, 15/30, 20/40, 25/35, 30/50 , 35/60, 50/80, 80/100), special overcurrent values ​​can be customized according to customer requirements.
As we all know, lithium batteries are new energy batteries that are used in various fields at present, but lithium batteries need protection from protection boards. Many people do not know that protection boards play a vital role in battery use. Let us understand The structure of the protection board and its protection principle.
The protection board has two core components: a protection IC that is reliably protected by a precision comparator. The other is that the MOSFET string acts as a high-speed switch in the main discharge circuit, performing a protection action, and the IC controls the MOS tube by monitoring the battery voltage difference. There are resistors, capacitors, and auxiliary FUSE, PTC, NTC, ID, and storage on the common protection board. B+ and B- on the protection board are respectively connected to the positive and negative electrodes of the battery. P+ and P- are the positive and negative electrodes of the protection board output, respectively. The figure is a schematic diagram of a protection board:
The protection board overcharges, overdischarges, shorts, overcurrents, and protects the battery.
Lithium battery requires constant current and constant voltage during charging. In the initial stage of charging, it is charged with constant current. With the charging process, the voltage rises to a certain value and is converted to constant voltage charging until the current becomes smaller and smaller. When the battery is being charged, if the charging circuit loses control, the voltage will exceed a certain value and the constant current charging will continue, and the battery voltage will continue to rise, which will cause battery damage or safety problems. When there is a protection board in the battery, the overcharge protection function of the protection board will be activated, and the MOS tube will be cut off, the battery pack is prohibited from being charged, and the safety of the battery is protected.
As with all other protections, the protection board constantly monitors the various conditions of the battery and takes protective measures.
Now not all lithium battery protection boards need to be activated, but some protection ICs need to be activated, and this is the old IC solution. The old IC solution needs to do this in order to make the protection board not work to reduce static electricity. Discharge energy, so that the lithium battery is stored a little longer. This is why the design requires charging activation.
The field effect transistor used in the lithium battery protection board is used as a protection element. The circuit is specially designed to ensure that the battery will not be reconnected to the circuit when it is abnormal. The method is that the power supply of the control part of the protection circuit is powered after the protection field effect transistor, and the circuit only works after the protection tube is normally turned on. Therefore, after the first use or after the protection has been generated, the protection circuit is inoperable because the power of the subsequent circuit is disconnected and the circuit has no power. The battery has no output. At this time, only the battery is connected to the charger, and the charger is used to supply power to the control circuit of the protection circuit, and the control part is powered, and the battery can be used normally.
How to activate the lithium battery protection boardIf the protection board is activated after the current limit protection, it may need to be activated by charging or after the load is completely disconnected, it is relatively troublesome, but you can also short-circuit B-(battery negative) and P-(discharge negative). The protection will be released. Remember to avoid carrying a large load when you touch it shortly (for example, turn it all the time), otherwise it may cause a lot of sparks. The root cause is the large differential pressure across the MOS after protection. The short touch is to directly reset the DS level of the discharge MOS to 0V, and the protection is released at this moment.
Note: It should be that most of the boards are common, even if some do not work, this will not cause damage to the board.
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