The function of mobile phone lithium battery protection board
Lithium-ion batteries used in electronic products such as mobile phones, tablets, and notebook computers are called 3C lithium batteries. Lithium battery is a kind of green environmental protection battery, in production and use, it does not contain lead, mercury, cadmium and other toxic and harmful heavy metal elements. In addition, the lithium battery has a long service life, high energy density, high power endurance, fast charge and discharge, and superior cycle performance. However, it is worth noting that the safety of mobile phone lithium batteries in use. Improper use of mobile phone lithium batteries may affect its performance and lifespan. If it is serious, it will cause the battery to burn and explode. Therefore, enterprises will Increase the protection board for the battery of the mobile phone.
The function of the mobile phone lithium-ion battery protection board is to protect the battery from over-discharge, over-charge, over-current, and short-circuit, effectively avoiding some illegal operations that damage the normal function of the battery. The mobile phone lithium battery protection board needs to be tested before use, and can be installed on the lithium battery after passing the test standard. The following basic test items are important:
1. Overcharge protection test
The charging time of the mobile phone lithium battery is too long, the greater the possibility of explosion. The purpose of the overcharge protection test is to check that the protection board takes protective measures to cut off the charging line in time when the battery is charged for a long time.
2. Over discharge protection test
If the discharge voltage of the battery is less than 2.5v, it is equal to over-discharge. Over-discharge will shorten the service life of the battery, and in severe cases, it will cause the battery to fail. This test is to detect that the protection board takes protective measures to cut off the discharge circuit when the cell phone battery is not charged in time and the voltage is too low during use.
3. Discharge overcurrent protection test
Mobile phone lithium-ion batteries cannot be used for high-current discharge. When excessive current is discharged, the internal temperature will be higher and energy will be lost, reducing the discharge time. If there is no protection element in the battery, it will overheat and damage the battery. The over-current protection test is Protective measures taken to prevent excessive discharge current.
4. Short circuit protection test
Mobile phone lithium-ion batteries are prone to short-circuits during the charging process. Short-circuits are the extreme case of over-current. Avoiding short-circuits in time is an important function of the protection board.
In addition to the above four basic tests, there are delay tests, internal resistance tests, recovery tests, balance tests, self-consumption current tests, etc. in the production process of mobile phone lithium battery protection boards. The performance test results of the protection board have a great impact on the product quality of the mobile phone lithium battery, so the battery manufacturer will have a very strict standard during the test process, including the selection of test equipment.
The test of mobile phone lithium battery protection board has high current requirements. The general probe module cannot meet the rated current required by the mobile phone lithium battery protection board. For this reason, a high-current shrapnel micro-needle module must be selected. One is that the current that can pass can reach up to 50A, and the overcurrent capability is strong; the other is that there will be no current attenuation during the current transmission process, and it has a good connection function. In the test of the lithium battery protection board, the high current shrapnel microneedle module has a service life of more than 20w times, the test efficiency is high, and the current conduction ability is good.
With this high-current shrapnel micro-needle module, it provides a strong guarantee for the testing of mobile phone lithium battery protection boards. With the enhancement of smartphone performance, the safety of mobile phone lithium batteries is more important. Battery manufacturers are protecting mobile phone lithium batteries. In the production of the board, strict and high-standard test requirements can be used to control the important links. It is responsible for the performance of the mobile phone lithium battery protection board, and is responsible for the safety of the mobile phone lithium battery.