Lithium battery overcharge
Definition: It means that when charging a lithium battery, the charging voltage or charging amount exceeds the rated charging limit of the battery design.
Generating cause:
Failure of charger: Problems in the voltage control circuit of the charger cause the output voltage to be too high. For example, the voltage regulator component of the charger is damaged, which may make the output voltage out of the normal range.
Failure of the charge management system: In some complex electronic devices, the charge management system is responsible for monitoring the state of charge of the battery. If this system fails, such as a malfunctioning detection circuit or an incorrect control algorithm, it cannot properly control the charging process, which may lead to overcharging.
Hazard:
Increase in internal battery pressure: Overcharging causes a series of chemical reactions to occur within the battery, generating excessive gases and leading to a sharp rise in internal battery pressure.
Safety Hazard: In serious cases, it may trigger dangerous situations such as battery bulging, liquid leakage, or even explosion.
Impact on battery life: Overcharging will also cause irreversible damage to the electrode materials of the battery, causing rapid decline in battery capacity and shortening the service life of the battery.
Lithium battery over-discharge
Definition: It means that during the discharge process of lithium battery, the discharge voltage or discharge amount is lower than the rated discharge lower limit of battery design.
Generating cause:
Overuse: Users do not charge the device in time when using it, allowing the battery to continue to discharge until the power is depleted. For example, during the use of a smart phone, ignore the low battery alert and continue to use the phone until it automatically shuts off, at which point the battery may already be in an over-discharged state.
Device malfunction: the device's power management system is malfunctioning and cannot accurately monitor the battery level, or the device has problems such as leakage, which leads to over-discharge of the battery.
Harm:
Battery performance degradation: over-discharge will lead to changes in the structure of the active substance inside the battery, resulting in lower capacity and unstable output voltage.
Possible Battery Scrap: Severe over-discharge may cause irreversible reactions of the chemicals inside the battery, resulting in a battery that can no longer be charged and used normally, thus causing the battery to be scrapped.
Post time: Sep-13-2024