First of all, we must ensure that the charger matches the electrical appliances to be charged, voltage matching and current matching, voltage matching is very important, and the current indicator of the charger determines the charging time, the higher the current indicator, the faster the charging speed;
The second is the more conventional judgment is the color change of the indicator light of the charger or the lamp on the appliance, which is generally from red to green, indicating that it is full.
Measuring the voltage of the appliance, the battery power is different and the terminal voltage is not the same, the less power the lower the voltage, so the battery voltage has a range, from the lower limit that can make the appliance work normally to full charge. Lithium-ion batteries can be directly judged according to the battery voltage, when the voltage exceeds the set cut-off voltage, the battery is considered to be full; Advanced chargers use voltage and current joint judgment. When the voltage is close to the cut-off voltage, switch to constant voltage charging, and when the current is less than a certain set value, the battery is considered to be full. The charger judged by the lowest level of voltage comparison can judge the fully charged battery in a short time, because the voltage comparison charger is only to judge the battery voltage. As long as the voltage of the battery is reached, it is judged to be full, and it is usually reached
Lithium battery chargers can determine whether the battery is fully charged by detecting battery voltage changes and charging time.
First, when the lithium battery voltage reaches a stable value, the charger will stop charging, because the battery is fully charged at this time. Second, even if the battery voltage has not reached a stable value, the charger will automatically stop charging according to the set charging time. Because it normally takes about twice as long for a lithium battery to be fully charged as it takes for the charger to charge, the charger will stop charging after the preset time. It should be noted that although the lithium battery charger has intelligent electronic line protection, overcharging will still affect the life of the lithium battery, so it is recommended to unplug the power in time after the charger automatically stops charging.
When the battery is fully charged, the smart charger will automatically jump off the charge, which means that the electricity is full.
There is also a case that the preset charging time is too short, the battery is not full, the charger will automatically stop charging, in order to safety it is recommended to unplug the battery after it is fully charged.
The lithium battery can be fully charged in the following ways: By detecting the changes in the voltage and current of the lithium battery, as well as the feedback signal of the charger control chip, you can determine whether the lithium battery is fully charged.
When the lithium battery starts to charge, the voltage and current will continue to increase with the process of charging, and at the end of the charge, the voltage and current will stop increasing or only maintain a very low level.
At this time, the charger control chip will give a feedback signal, indicating that the battery has been fully charged.
In order to protect the battery and charger, usually the charger will be set overcharge protection function, once the battery is full, the charger will automatically cut off the power to prevent the battery from overcharging and the charger from overheating due to long-term work.
In addition, the charging judgment method of different models of lithium battery chargers may be different, and it is necessary to judge according to the charger manual.