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What is the use of ternary lithium ion battery protection board?

What is the use of ternary lithium ion battery protection board?

Release date:2018-11-16 author: clicks:

The ternary lithium-ion battery protection board is a charge-discharge protection for the series lithium battery pack; when fully charged, the voltage difference between the individual cells can be guaranteed to be less than the set value (generally ±20 mV), and the battery cells of the battery pack can be realized. The equalization charge effectively improves the charging effect under the series charging mode; at the same time, detects the overvoltage, undervoltage, overcurrent, short circuit and overtemperature conditions of each single cell in the battery pack, protects and prolongs the service life of the battery; Protection prevents each single cell from being damaged by overdischarge during discharge.


The finished lithium battery consists mainly of two major parts, a ternary lithium ion battery 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 filled. The electrolyte is made into a battery after packaging. The role of the lithium battery protection board is not known to many people. The lithium battery protection board, as its name suggests, is used to protect lithium batteries. The role of the lithium battery protection board is to protect the battery but not charge it. However, the flow is also the output short circuit protection.


Ternary lithium ion battery technical parameters


Equilibrium current: 80mA (when VCELL=4.20V)


Equilibrium control point: 4.18±0.03V overcharge threshold: 4.25±0.05V (4.30±0.05V optional)


Over-discharge threshold: 2.90±0.08V (2.40±0.05V 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: lithium iron phosphate lithium ion battery 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.


Lithium battery protection board principle


The reason why lithium batteries (fillable) need protection is determined by its own characteristics. Because the material of lithium lithium manganese oxide battery lithium battery itself can not be overcharged, overdischarged, overcurrent, short circuit and ultra high temperature charge and discharge, lithium battery lithium battery components will always follow an exquisite protection board and a current insurance Appears.


The protection function of lithium iron phosphate lithium ion battery is usually completed by the protection circuit board and the current device such as PTC. The lithium manganese oxide lithium ion battery protection board is composed of electronic circuits and is accurate at -40 ° C to +85 ° C environment. Monitor the voltage of the battery core and the current of the charging and discharging circuit to control the on/off of the current circuit in time; the PTC prevents the battery from being damaged in a high temperature environment.


Ordinary lithium battery protection boards usually include control ICs, MOS switches, resistors, capacitors, and auxiliary devices FUSE, PTC, NTC, ID, memory, and so on. The control IC controls the MOS switch to be turned on under all normal conditions, so that the cell and the external circuit are turned on, and when the cell voltage or the loop current exceeds a prescribed value, it immediately controls the MOS switch to turn off, and protects the cell. Safety.


When the protection board is normal, Vdd is high level, Vss, VM is low level, DO and CO are high level. When any parameter of Vdd, Vss, VM is changed, the level of DO or CO will be A change has occurred.


1. Overcharge detection voltage: In the normal state, Vdd gradually rises to the voltage between VDD and VSS when the CO terminal changes from a high level to a low level.


2. Overcharge release voltage: In the state of charge, Vdd gradually decreases to the voltage between VDD and VSS when the CO terminal changes from low level to high level.


3. Overdischarge detection voltage: In the normal state, Vdd gradually decreases to the voltage between VDD and VSS when the DO terminal changes from a high level to a low level.


4. Overdischarge release voltage: In the overdischarge state, Vdd gradually rises to the voltage between VDD and VSS when the DO terminal changes from low level to high level.


5. Overcurrent 1 detection voltage: In the normal state, the VM gradually rises to the voltage between VM and VSS when DO changes from high level to low level.


6. Overcurrent 2 detection voltage: In the normal state, the VM rises from OV at a speed of 1 ms or more and 4 ms or less to the voltage between VM and VSS when the DO terminal changes from a high level to a low level.


7. Load short-circuit detection voltage: In the normal state, the VM rises at a speed of 1 μS or more and 50 μS or less from OV to the voltage between VM and VSS when the DO terminal changes from a high level to a low level.


8. Charger detection voltage: In the overdischarge state, the VM gradually drops to OV and the voltage between VM and VSS when the DO changes from low level to high level.


9. Current consumption during normal operation: In the normal state, the current flowing through the VDD terminal (IDD) is the current consumption during normal operation.


10. Over-discharge current consumption: In the discharge state, the current flowing through the VDD terminal (IDD) is the over-current discharge current consumption.

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