The battery receives electrical energy from an external circuit and converts it into chemical energy in the battery. After the battery energy is consumed by discharging, it is restored by charging and can be discharged again, thus forming a charge-discharge cycle. Typically, direct current (asymmetric alternating current or pulsed current is also used) is used for charging.
In different circumstances, different charging methods are used, such as constant current charging, constant voltage charging, floating charging, trickle charging, fast charging or a combination of these methods.
According to the formula power = voltage * current * time, when the power is fixed, the charging time can only be shortened by increasing the voltage or current.
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Rebrands:
1. The charger's operating selection must be consistent with that of the battery being charged. If the charger works in lithium battery state and charges nickel-metal hydride or nickel-cadmium batteries, the battery will not be fully charged and the working time will be greatly reduced. If the charger operates in the nickel battery state and charges the lithium-ion battery, the lithium battery will be overcharged, which will seriously affect the battery life.
2. It is necessary to know if the battery is really fully charged when the charger is fully turned on. Some chargers can remove the lithium battery when the full charge light is on, and some chargers cannot remove the battery until the light is fully on.
Baidu Encyclopedia - Charging
Do you know what the principle of fast charging is?has battery?
Theoretically, lithium batteries charge faster than lead-acid batteries due to the high activity of lithium. But it is not recommended to use fast charging. Fast charging will not have enough power as slow charging. And fast charging damages the battery.
The allowed charging current of lithium batteries can be a little higher than that of lead-acid batteries (for example, the maximum allowed is 1C), usually 0.2-0.4C is chosen (lithium batteries for electric vehicles generally choose 0.2c).
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If charging continues, since the storage compartment of the negative electrode has been filled with lithium atoms, subsequent lithium metal will accumulate on the surface of the negative electrode material. These lithium atoms will grow dendrites from the surface of the negative electrode towards the lithium ions.
These metallic lithium crystals will pass through the separator and short-circuit the positive and negative electrodes. Sometimes the battery explodes before a short circuit occurs. During the overcharging process, the electrolyte and other materials will decompose and produce gas, causing the battery shell to swell and rupture or of the pressure valveession, allowing oxygen to enter and react with the lithium atoms accumulated on the surface of the negative electrode, leading to an explosion.
The fast charging method is indeed very attractive, and the laboratory operation also shows high feasibility, but until the safety test data does not are not available, I support the opponents. In short, it is very problematic to dissipate the heat brought by such a large current in such a short time during rapid charging, and a small closed system like a battery can easily turn into a small bomb under the impulse of this heat. Of course, this does not mean that no one will succeed in developing materials that meet the safety requirements of fast charging in the future, but I think that many of the solutions to these problems should be left to field engineers and personnel of business processes. improve spacebattery packaging and battery core design, how to adjust the position of circuit board and core components on electric vehicles, and develop additional water cooling or heat extraction devices. These issues may need to be resolved by industrial personnel, and I believe they should be accomplished in the near future.