Repair methods and common faults of lithium battery protection boards. The extent of damage to a lithium battery protection board depends on the degree of damage and the value of repair. As the name suggests, a lithium battery protection board is used to protect lithium batteries. Its function is to protect the battery from over-discharge, over-charge, and overcurrent, as well as output short circuits. How to repair a damaged lithium battery protection board?
If the lithium battery's protection board is faulty, try charging it with a charger to see if it activates. If it doesn't fully charge, it's definitely faulty. This could be due to damaged electronic components or a recent reset. However, if the protection board is faulty, the measured voltage should be 0V. If you have experience with lithium battery protection boards, let's discuss why they lack charge/discharge protection; hopefully, this will provide some helpful information.
Under what circumstances does a lithium battery protection board lack charge/discharge protection?
First, let's look at the ternary parameters: lithium and iron are 2.8 ~ 4.25 V and 2.5 ~ 3.65 V, respectively.
1. The cause could be overcharging, over-discharging, overcurrent, short circuit, or overheating.
2. Use a multimeter to check if the charging/discharging MOSFET is open-circuited.
3. If the lithium battery protection board is equipped with an LED, the LED will flash for 0.5 seconds as an alarm when the battery cannot be charged or discharged.
4. If the lithium battery protection board is equipped with a host computer, you can connect to the host 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.
In these cases, you can check the following methods to fix it:
1. Recycle the device after it has been overcharged, over-discharged, over-currented, or short-circuited and is plugged into the charger.
2. Overcurrent disconnection and load recovery
What is a lithium battery protection board?
The lithium battery protection board provides charge and discharge protection for a series of lithium battery packs. After a full charge, it ensures that the voltage difference between individual cells is less than a set value, allowing all cells in the battery pack to charge evenly and effectively improving the charging performance in series charging mode. Simultaneously, it detects overvoltage, undervoltage, overcurrent, short circuit, and overtemperature conditions of each individual cell in the battery pack to protect and extend battery life. Undervoltage protection prevents damage to each individual cell during discharge due to over-discharge.
The protection function of lithium batteries is typically achieved through a combination of a protection circuit board and current-controlled devices such as PTCs. The protection board, composed of electronic circuitry, can accurately monitor cell voltage and charging/discharging circuit current in environments ranging from -40°C to 85°C, promptly controlling the continuity of the current circuit. PTCs prevent severe damage to the battery in high-temperature environments.
A typical lithium battery protection board usually includes a control IC, MOS switches, resistors, capacitors, and auxiliary components such as fuses, PTCs, NTCs, IDs, and memory. The control IC controls the MOS switches to conduct under normal conditions, connecting the battery cell to the external circuit. When the battery cell voltage or circuit current exceeds a specified value, it immediately controls the MOS switches to turn off, protecting the battery cell.
Principle of lithium battery protection board:
The need for protection in lithium batteries (rechargeable) stems from their inherent characteristics. Due to the nature of lithium batteries, they cannot be overcharged, over-discharged, over-currented, short-circuited, or subjected to excessively high temperatures during charging and discharging. Therefore, lithium battery modules always include a sophisticated protection board and a current fuse.
The protection function of lithium batteries is typically achieved through a combination of a protection circuit board and current-controlled devices such as PTCs. The protection board, composed of electronic circuitry, can accurately monitor cell voltage and charging/discharging circuit current in environments ranging from -40°C to 85°C, promptly controlling the continuity of the current circuit. PTCs prevent severe damage to the battery in high-temperature environments.
A typical lithium battery protection board usually includes a control IC, MOS switches, resistors, capacitors, and auxiliary components such as fuses, PTCs, NTCs, IDs, and memory. The control IC controls the MOS switches to conduct under normal conditions, connecting the battery cell to the external circuit. When the battery cell voltage or circuit current exceeds a specified value, it immediately controls the MOS switches to turn off, protecting the battery cell.
