Overdischarge Prevention of Liquid Lithium-Ion Batteries

　　Overdischarge Prevention of Liquid Lithium-Ion Batteries

　　Overdischarging, which occurs when the battery voltage drops below its safe operating range, can cause irreversible damage to liquid lithium-ion batteries. When a battery is overdischarged, the chemical reactions inside the battery deviate from the normal state. The electrolyte may decompose, and the electrodes may undergo structural changes, leading to a sharp decline in battery capacity and a shortened service life. In severe cases, overdischarge can also cause the battery to swell or leak, posing environmental and safety risks.

　　Battery management systems are again the primary safeguard against overdischarge. BMS constantly monitors the battery voltage during the discharging process. When the voltage of a single cell drops to the predefined overdischarge cutoff voltage, typically around 2.5 - 2.7V, the BMS will promptly disconnect the load, preventing further discharge. This ensures that the battery is not subjected to excessive discharge stress.

　　In addition to BMS - based protection, software - based protection mechanisms are also important. Many electronic devices that use lithium-ion batteries have built-in power management software. This software predicts the remaining battery life based on the current power consumption rate and the measured battery voltage. When the predicted remaining capacity reaches a low level, the device will display a low - battery warning to the user. As the battery voltage continues to drop, the device may enter a power-saving mode, reducing power consumption by adjusting the screen brightness, turning off non-essential functions, etc. If the battery voltage approaches the overdischarge cutoff voltage, the device will automatically shut down to protect the battery.

　　Moreover, some advanced battery designs incorporate self-protection features at the cell level. For example, certain electrolyte additives can form a protective film on the electrode surface under low-voltage conditions, inhibiting further electrochemical reactions and reducing the damage caused by overdischarge.

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