What are the critical parameters of lithium batteries?

The capacity of the battery depends on the amount of active material in the battery, and is usually stated in milliampere-hours (mAh) or ampere-hours (Ah). For example, 1000 mA can be converted into a charge of about 3600C in 1A current discharge for 1 hour. The internal structure of the lithium battery 2. Nominal voltage The potential difference between the positive and negative electrodes of the battery is called the nominal voltage of the battery. The nominal voltage is determined by the electrode potential of the pole piece material and the concentration of the internal electrolyte. The discharge potential of lithium battery is parabolic, 4.3V~3.7V and 3.7V~3.0V, which change rapidly. As long as the discharge time of about 3.7V is the longest, almost accounting for 3≤4, so the nominal voltage of the lithium battery refers to the voltage that maintains the longest discharge time. The nominal voltage of the lithium battery is 3.7V and 3.8V respectively, the battery with a charge stop voltage of 3.7V is 4.2V, and the 3.8V battery is 4.35V. Lithium battery operation principle 3. Charging stop voltage When the rechargeable battery is fully charged, the active material on the pole piece has reached a saturated state, if the battery continues to be charged, the battery voltage will not rise. At this moment, this voltage is called the charge stop voltage. The voltage of the lithium battery is 4.2V or 4.35V. 4. Discharge stop voltage The discharge stop voltage refers to the minimum voltage allowed when the battery is discharged. The discharge stop voltage is related to the discharge rate. Generally speaking, the unit lithium battery is 2.7V. 5. The internal resistance of the battery The internal resistance of the battery depends on the resistance of the battery pole piece and the resistance of the ion current. During the charging and discharging process, the resistance of the image engine and the pole piece remain unchanged, but the resistance of the ion current changes with the concentration of the electrolyte and the addition of charged ions. When the OCV voltage of the lithium battery drops, the impedance increases. Therefore, when charging at low power (less than 3V), pre-charge (trickle charging) should be the first step to prevent excessive heat from the battery due to excessive current. Lithium battery operation principle Statement: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: What are the precautions for battery charging