The principle of overprotection of lithium battery

The principle of overprotection of lithium batteries. The protection circuit of the lithium battery 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, overdischarge protection and overcharge protection. Current/short circuit protection. Overcharge protection device. The principle of the overcharge protection IC is as follows: When the external charger is charging the lithium battery, in order to guard against the increase in internal pressure caused by the temperature rise, the charging must be stopped. At this time, the protection IC needs to test the voltage of the battery, and when it reaches (assuming that the battery's overcharge point is), it will provide overcharge protection, which turns the power MOSFET off, and then cuts off charging. In addition, you must pay attention to the overcharge test malfunction caused by noise, so as not to be judged as overcharge protection. Therefore, the delay time must be set, and the delay time cannot be less than the noise continuing time. Over discharge protection device. When the discharge is excessive, the performance of the lithium battery will deteriorate due to the analysis of the electrolyte, and the number of charging times will decrease. The use of lithium battery protection IC can guard against over-discharge and realize battery protection. Principle of over-discharge protection IC: In order to guard against the over-discharge status of the lithium battery, suppose that the lithium battery is connected to a load. When the voltage of the lithium battery is lower than its over-discharge voltage tester (assumed to be), the over-discharge protection will be used. The power MOSFET changes from open-type to off-type and off-type discharge to guard against overdischarge and make the battery in a standby state, that is, only an overdischarge current of μA. The protection circuit of the lithium battery 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, overdischarge protection and overcharge protection. Current/short circuit protection. Disclaimer: Some pictures and content of the articles published on this site are from the Internet, please contact to delete if there is any infringement. Previous: Will lithium batteries become the protagonist in the future