Repair methods and common faults of lithium battery protection board. The damage of the lithium battery protection board depends on the extent of the damage and whether there is any repair value. The lithium battery protection board, as the name suggests, is used to protect the lithium battery. The function of the lithium battery protection board is to protect the battery from over-discharge, over-charge, over-current, and output short-circuit protection. How to repair the lithium battery protection board broken? Let’s look down with Xiaobian!
How to repair and repair the lithium battery protection board is broken?
If the lithium battery protection board is broken, you can first charge it with a charger to see if the protection board can be activated. If it can’t be charged, it must be broken. It may be that the electronic components are damaged, or it may be reset! However, if the protection board is broken, the measured value should be 0V. If you are in contact with the lithium battery protection board, you may wish to discuss why the lithium battery protection board has no charge and discharge protection. I hope to bring you some useful help.
What are the situations where the lithium battery protection board has no charge and discharge protection?
First check the ternary parameters: the conventional is 2.8～4.25, the iron-lithium is 2.5～3.65V
1. It may be over-charge, over-discharge, over-current, short-circuit, and over-temperature.
2. Use a multimeter to test whether the charging and discharging MOS tube is turned on
3. If the lithium battery protection board is equipped with LED, it will alarm if the LED flashes for 0.5 seconds if it cannot be charged or discharged.
4. If the lithium battery protection board is with a host computer, you can connect to 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 plug into the charger to recover
2. Overcurrent disconnection and load recovery
What is a lithium battery protection board?
The lithium battery protection board is the charge and discharge protection of the series lithium battery pack; when fully charged, it can ensure that the voltage difference between the single cells is less than the set value, and realize the equal charge of the single cells of the battery pack, which effectively improves The charging effect under the series charging mode; at the same time, the overvoltage, undervoltage, overcurrent, short circuit, and overtemperature status of each single battery in the battery pack are detected to protect and extend the battery life; undervoltage protection makes each single battery in Avoid battery damage due to over-discharge when discharging.
Principle of lithium battery protection board: The reason why lithium battery (rechargeable type) needs protection is determined by its own characteristics. Because the material of the lithium battery itself determines that it cannot be overcharged, overdischarged, overcurrent, short-circuited, and ultra-high temperature charging and discharging, the lithium battery components will always appear with a delicate protection board and a current fuse.
The protection function of lithium battery is usually completed by a protection circuit board and current devices such as PTC. The protection board is composed of electronic circuits, which can accurately monitor the voltage of the battery cell and the charging and discharging circuit at all times under the environment of -40°C to +85°C. Current, timely control the on and off of the current loop; PTC prevents severe damage to the battery in high temperature environments.
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 turn on under all normal conditions to make the cell and the external circuit conduct, and when the cell voltage or loop current exceeds the specified value, it immediately controls the MOS switch to turn off to protect the cell’s Safety.
What are the common faults of lithium battery protection board?
1. No display, low output voltage, no load
2. No charging
3. No internal resistance, large internal resistance
4. No resistance
5. Large overcurrent
6. No decoding
The above is the method of repairing and repairing a broken lithium battery protection board, as well as some common failures. Lithium batteries are a very practical battery type in our lives. For lithium batteries, the charge and discharge protection of their series-connected battery packs is a component called lithium battery protection board, which is responsible for the safety of the battery. Important mission, its own performance and quality are also an important factor of battery pack performance and quality.