Repair methods and common faults of lithium battery protection board
Repair methods and common faults of lithium battery protection board. The damage to the lithium battery protection board depends on the extent of the damage and the value of repair. Lithium battery protection board, as the name suggests, is used to protect lithium batteries. 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 damaged lithium battery protection board? Let's read down with the editor!
How to repair and repair the damaged lithium battery protection board?
If the lithium battery protection board is damaged, you can first charge it with a charger to see if the protection board can be activated. If it cannot be charged, it must be broken. It is possible that the electronic components are damaged, or it is possible to reset them! However, if the protective board is broken, the measured value should be 0V. If you have come into contact with a lithium battery protection board, you can discuss together why there is no charge and discharge protection for the lithium battery protection board. We hope to provide some useful help to everyone.
What are the situations where the lithium battery protection board does not have charge and discharge protection?
First, check the ternary parameters: conventional values are 2.8~4.25, and iron lithium values are 2.5~3.65V
1. It may be due to voltage overcharging, discharging, overcurrent, short circuit, or overheating.
2. Use a multimeter to check if the charging and discharging MOS tubes are open
3. If the lithium battery protection board is equipped with an LED and cannot be charged or discharged, the LED will flash for 0.5 seconds and give an alarm
4. If the lithium battery protection board is equipped with an upper computer, it can be connected to the upper computer to check the protection status
5. The lithium battery protection board is equipped with a weak point switch. Please check if the weak point switch is turned on
The following methods can be used to repair these situations:
1. Overcharge, over discharge, over current, short circuit insertion charger recovery
2. Overcurrent disconnection load recovery
What is a lithium battery protection board?
The lithium battery protection board is used for charging and discharging protection of series lithium battery packs; When fully charged, it can ensure that the voltage difference between individual batteries is less than the set value, achieving equal charging of each individual battery in the battery pack, effectively improving the charging effect under series charging mode; Simultaneously detecting the overvoltage, undervoltage, overcurrent, short circuit, and over temperature status of each individual battery in the battery pack to protect and extend the battery's service life; Undervoltage protection prevents damage to each single battery due to over discharge during use.
Principle of lithium battery protection board: The reason why lithium batteries (rechargeable) need protection is determined by their own characteristics. Due to the material of the lithium battery itself, it cannot be overcharged, discharged, overcurrent, short circuited, or charged or discharged at ultra-high temperatures. Therefore, the lithium battery components always appear with a delicate protective plate and a current protector.
The protection function of lithium batteries is usually completed by the collaboration of protection circuit boards and PTC and other current devices. The protection board is composed of electronic circuits, which accurately monitor the voltage of the battery cell and the current of the charging and discharging circuit at all times in an environment of -40 ℃ to+85 ℃, and timely control the on-off of the current circuit; 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 conduct under all normal conditions, making the battery cell and the external circuit conduct. When the battery cell voltage or circuit current exceeds the specified value, it immediately controls the MOS switch to turn off, protecting the safety of the battery cell.
What are the common faults of lithium battery protection boards?
1. No display, low output voltage, unable to carry load
2. Not charging
3. No internal resistance, high internal resistance
4. No resistance
5. Excessive current
6. Do not decode
The above are the methods for repairing and repairing the damaged lithium battery protection board, as well as some common faults. Lithium batteries are a type of battery with strong practicality in our daily lives. For lithium batteries, a component called a lithium battery protection plate is used to achieve charge and discharge protection for their series battery pack. It bears an important mission for the safety of the battery, and its performance and quality are also important factors in the performance and quality of the battery pack.
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