209 views Yuda Electronic (HK) Technology Co.,Limited. 2018-08-24
Lithium-ion batteries are classified into a liquid lithium ion battery (LIB) and a polymer lithium ion battery (PLB), depending on the electrolyte material used in the lithium ion battery. For example, the Samsung S6 phone battery uses a polymer lithium-ion battery.
Lithium-ion battery (Li–ion)
Lithium-ion batteries are currently the most widely used batteries in modern digital products such as mobile phones and notebook computers, but they cannot be overcharged or over-discharged during use (which can damage the battery or make it scrapped). Therefore, there are protective components or protection circuits on the battery to prevent expensive battery damage. Lithium-ion battery charging requirements are very high, to ensure that the termination voltage accuracy is within ±1%, major semiconductor device manufacturers have developed a variety of lithium-ion battery charging IC to ensure safe, reliable and fast charging.
Mobile phones basically use lithium-ion batteries. Proper use of lithium-ion batteries is important to extend battery life. The rated voltage of a lithium-ion battery is generally 3.7V due to material changes, and 3.2V for the positive electrode. The termination charging voltage when fully charged is generally 4.2V, and the positive electrode is 3.65V. The termination discharge voltage of a lithium ion battery is generally 3.0V, and the positive electrode is 2.5V. Over-discharge can damage the battery.
Lithium-ion battery charging is divided into two phases: first constant current charging, and changing to constant voltage charging when it is close to the termination voltage. For example, a battery of 800 mAh capacity has a termination charging voltage of 4.2V. The battery is charged at 800mA (charge rate 1C) constant current. At the beginning, the battery voltage is boosted greatly. When the battery voltage is close to 4.2V, it is changed to 4.2V constant voltage charging, the current is gradually reduced, the voltage changes little, and the charging current is reached. When it is reduced to 1/10, it is considered to be close to full and can be terminated.
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