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Is it harmful to charge electric vehicle lithium battery packs for too long? The lithium-ion battery of an electric vehicle is fully depleted, and the charging time is 8 hours+2 hours. If the battery is not fully depleted, the charging time will be correspondingly reduced. Long term electric charging is considered overcharging, which can be detrimental to the battery life.

Is it harmful to charge electric vehicle lithium battery packs for too long?

In theory, overcharging the lithium battery pack of electric vehicles can damage the lithium battery; Generally, chargers come with charging protection, so using a reputable manufacturer's charger is safe and will not overcharge; If the quality of the charger is poor, overcharging problems may occur, which is very dangerous.

If the charging voltage fluctuates and the stability is disrupted due to temperature or unexpected factors, it is possible for the battery to "explode".

It is most likely that small and prolonged voltage fluctuations can lead to overcharging of the lithium battery pack and affect its lifespan. Overcharging leads to a decrease in battery life, and it can cause a large amount of gas to flush the battery's plates, causing the active material to fall off, ultimately reducing the lifespan of the lithium battery pack.

Generally, newly purchased electric vehicle batteries are new and have a large capacity. The charging time is longer, reaching more than 10 hours without changing the lights. They will become faster in the future, and will decrease to 6 hours after about 2 months. After that, they will remain constant for about six months. The battery capacity will continue to decline, and it can be fully charged in 3-4 hours after 1 year. Of course, the battery should also be replaced or needs maintenance.

How long is it suitable to charge the lithium battery pack for electric vehicles?

Normally, if it is a brand new battery and a matching charger is used, the charger will have an overcharge protection device, which will not charge the battery again when it is fully charged. At this point, even if the power plug is not unplugged, the battery will not overcharge.

However, if a matching charger is not used, or if the charger is faulty, or if the battery has aged, the overcharge protection device may fail. It is recommended to charge the lithium-ion battery pack of electric vehicles for no more than 4 hours as much as possible to avoid damaging the battery and even causing accidents such as fires.

Generally, lithium battery packs automatically turn green when fully charged, and at this time, they will continue to charge with low current to ensure the safety of the battery. It is best to follow the charging time stated in the specification sheet. For a 48V/20A lithium battery with a 5A charger, it takes over 4 hours to charge. For a 10A charger, it takes over 2 hours, and for a 20A charger, it takes one hour to charge.

Charging Techniques for Lithium Ion Batteries in Electric Vehicles

1. Do not charge the battery after it is completely depleted. Wait until the instrument shows two remaining lights, and then charge it because strictly speaking, lithium batteries cannot be overcharged or discharged.

2. When charging, do not place flammable materials nearby and do not cover the charger with debris to prevent accidental fire.

3. After the light turns green, recharge for 1-2 hours and then turn off the power.

4. Remember to plug in the battery end plug before charging, and then plug in the mains plug; After charging, unplug the mains plug first, and then unplug the battery end plug.

5. Do not charge for more than 8 hours after the green light.

In summary, overcharging is harmful and not beneficial, so the charger should be removed promptly after charging. The manual generally recommends charging for no more than 24 hours (some also say no more than 12 hours).

Develop good driving habits, avoid over discharging or overcharging, and eliminate the misleading idea of charging on demand. Choose a reasonable charging method based on the amount of electricity used. Prevent prolonged non charging after discharge, and ensure regular maintenance and charging when left unused for a long time.

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