The protection circuit of the lithium solar cell consists of a protection IC and two power MOSFETs. The protection IC monitors the battery voltage and switches to an external power MOSFET in the event of overcharge and discharge. Its functions include overcharge protection, over-discharge protection, and Overcurrent/Short Circuit Protection.
Overcharge protection device.
The principle of the overcharge protection IC is as follows: when an external charger is charging a lithium solar cell, it is necessary to stop trusting to prevent the internal pressure from rising due to temperature rise. At this time, the protection IC needs to detect the battery’s voltage. When it reaches (assuming that the overcharge point of the battery is), the overcharge protection is guaranteed, the power MOSFET is turned on and off, and then the charging is turned off.
1. Avoid extreme temperatures. Lithium solar cells are sensitive to extreme temperatures, so it is important to ensure that they are not exposed to temperatures below 0°C or above 45°C.
2. Avoid high humidity. High humidity can cause corrosion of the lithium cells, so it is important to keep them in a dry environment.
3. Keep them clean. Dirt, dust, and other contaminants can reduce the efficiency of the cells, so it is important to keep them clean and dust-free.
4. Avoid physical shock. Physical shock can damage the cells, so it is important to avoid dropping or hitting them.
5. Shield from direct sunlight. Direct sunlight can cause the cells to overheat and damage, so it is important to shield them from direct sunlight when possible.
6. Use a protective case. It is important to store the cells in a protective case when not in use to protect them from the elements.
In addition, attention must be paid to overcharge detection malfunction due to noise so as not to be judged as overcharge protection. Therefore, the delay time needs to be set, and the delay time cannot be less than the noise duration.
Post time: Jun-03-2023