Lithium battery protection board repair methods and common faults
Lithium battery protection board repair methods and common faults. The damage of the lithium battery protection board depends on the damage, and there is no value for repair. Lithium battery protection board, as its name implies, is used to protect lithium batteries. The role of the lithium battery protection board is to protect the battery from over-discharging, not charging, and not flowing, and output short circuit protection. How to repair the broken lithium battery protection board? And Xiaobian look down!
How to repair and repair the lithium battery protection board?
If the lithium battery protection board is broken, you can charge it with a charger first to see if you can activate the protection board. If you can't charge it, it must be broken. It may be that the electronic components are damaged, or it may be reset just fine! However, if the protection board is broken, the measured value should be 0V. If you have come into contact with the lithium battery protection board, let's discuss together why the lithium battery protection board has no charge and discharge protection. I hope to bring you some useful help.
Under what circumstances does the lithium battery protection board have no charge and discharge protection?
First check the ternary parameters: conventionally 2.8 ～ 4.25, iron lithium is 2.5 ～ 3.65V
1. May be voltage overcharge, over discharge, over current, short circuit, over temperature.
2. Use a multimeter to test whether the charge and discharge MOS tube is turned on.
3. If the lithium battery protection board is equipped with an LED, it cannot be charged or discharged, but the LED flashes for 0.5 seconds.
4. If the lithium battery protection board is equipped with a host computer, you can connect the host computer to view the protection status.
5. The lithium battery protection board has a weak point switch, please check whether the weak point switch is turned on
In these cases, you can check the following methods to repair:
1.Overcharge, overdischarge, overcurrent, short circuit are inserted into the charger to recover
2. Over-current disconnect load recovery
What is a lithium battery protection board?
The lithium battery protection board protects the charge and discharge of a series lithium battery pack. When fully charged, it can ensure that the voltage difference between the individual battery cells is less than the set value. Charging effect in series charging mode; simultaneously detecting the overvoltage, undervoltage, overcurrent, short circuit, and overtemperature status of each single cell in the battery pack to protect and extend the battery life; undervoltage protection enables each single battery to Avoid discharging the battery when it is discharged.
Principle of lithium battery protection board: The reason why lithium batteries (rechargeable) need protection is determined by their own characteristics. Because the material of the lithium battery itself determines that it cannot be overcharged, overdischarged, over-current, short-circuited, and charged and discharged at ultra-high temperature, the lithium battery component always follows a delicate protection board and a current fuse.
The protection function of the lithium battery is usually completed by the protection circuit board and current devices such as PTC. The protection board is composed of electronic circuits. It accurately monitors the voltage of the battery cell and the charging and discharging circuit in an environment of -40 ° C to + 85 ° C. Current, timely control the on / off of the current loop; PTC prevents the battery from being damaged badly in high temperature environment.
Ordinary lithium battery protection boards usually include control ICs, MOS switches, resistors, capacitors and auxiliary devices FUSE, PTC, NTC, ID, memory, etc. Among them, the control IC controls the MOS switch to be turned on under all normal conditions, so that the cell is connected to the external circuit. When the cell voltage or loop current exceeds the specified value, it immediately controls the MOS switch to turn off to protect the cell. Safety.
What are the common faults of the lithium battery protection board?
1.No display, low output voltage, no load
3.No internal resistance, large internal resistance
The above are the repair and repair methods of the lithium battery protection board, and some common faults. Lithium batteries are a very practical type of battery in our lives. For lithium batteries, the protection of the battery pack in series is a component called a lithium battery protection board, which is responsible for the safety of the battery. Important mission, its own performance and quality is also an important factor in battery pack performance and quality.