li ion 18650 battery pack

　　The whole process of charging and discharging of 18650 lithium battery

　　Analysis of the basic principle of lithium battery charge and discharge:

　　The working principle of lithium battery refers to its charging and discharging principle. When the battery is charged, a lithium-ion battery is formed on the positive stage of the rechargeable battery, and the formed lithium-ion battery moves to the negative stage through the lithium battery electrolyte. Carbon is used as the negative stage, with a sheet structure of a microporous plate, and the lithium-ion battery that reaches the negative stage is placed in the microporous plate of the carbon layer. The more lithium-ion batteries are inserted, the higher the battery charging capacity.

　　Similarly, when the battery is charging and discharging (that is, when we use the battery), the lithium battery embedded in the carbon layer of the negative electrode goes out and continues to move to the positive stage. The more lithium-ion batteries that go back to anodizing, the higher the charge-discharge capacity. The battery power that we usually say refers to the charge and discharge capacity.

　　During the charging process of the lithium battery, the lithium ion battery moves from the positive stage → the negative stage → the positive stage. If the lithium battery is compared to a rocking chair, the two sides of the rocking chair are the two sides of the battery, and the lithium battery is like an excellent player, running back and forth on both sides of the rocking chair. Therefore, experts have given lithium batteries a cute name: rocking chair rechargeable batteries.

　　18650 lithium battery charge and discharge the whole process;

　　Lithium battery charging operation is divided into two stages. The first stage is constant current power battery charging. When the battery voltage is less than V, the charging head will charge the battery with a constant current power supply. The second stage is the constant current source battery charging link. When the battery voltage reaches V, due to the characteristics of lithium batteries, if the voltage is higher, it will be destroyed. The charging head will fix the working voltage at V, and the current will gradually decrease. When the current decreases to a certain value (generally 1/10 of the set current), the battery charging power supply circuit will be disconnected, and the battery charging indicator will flash.

　　Overcharging a lithium battery can cause permanent damage to the positive and negative terminals. Excessive charging and discharging will cause the carbon sheet structure of the negative stage to collapse, and the collapse will cause the lithium-ion battery to be unable to be inserted during the charging process; excessive battery charging will cause too many lithium-ion batteries to be placed in the carbon structure of the negative stage, Some of them could not be released again.

　　Some charging heads are implemented with cheap designs, and the linearity is not good enough, which can easily cause abnormal charging and even damage the battery. When choosing a charging head, try to choose a well-known brand of 18650 lithium battery charging head, which can guarantee quality and quantity and after-sales service, and extend the service life of the battery. Well-known brands ensure that the 18650 lithium battery charging head has four protection functions: over-current protection, over-current protection, over-voltage protection, and rechargeable battery reverse connection protection. Overcharge protection: When the charging head overcharges the battery, in order to prevent the internal pressure from rising due to temperature rise, the charging state must be stopped. Therefore, the protection device needs to monitor the battery voltage. When the battery exceeds the charging voltage, the overcharge protection function is activated to stop charging. Overcharge and discharge protection: In order to better prevent the overcharge and discharge of the lithium battery, when the working voltage of the lithium battery is lower than its overcharge and discharge working voltage detection point, the overcharge and discharge protection is activated, the charge and discharge are terminated, and the rechargeable battery maintains Shutdown mode for low quiescent data current levels. Overcurrent protection: When the charging and discharging current of the lithium battery is too large or a short circuit fault occurs, the protection device will activate the overcurrent protection function.