How does the lithium battery charger know whether the battery is full?
Release time:
2021-11-09
Lithium battery charger how to know whether the battery is full of lithium battery charger by detecting the charging current and voltage, so as to determine whether the charge is complete. Together with the overcharge protection of the mobile phone, the lithium battery of your mobile phone will not be overcharged. Therefore, it is very important to buy a good quality lithium battery charger!
lithium battery charger how to know whether the battery is full of lithium battery charger by detecting the charging current and voltage, so as to determine whether the charge is complete. Together with the overcharge protection of the mobile phone, the lithium battery of your mobile phone will not be overcharged. Therefore, it is very important to buy a good quality lithium battery charger!
First of all, it is necessary to ensure that the lithium battery charger matches the electrical appliances to be charged. Voltage matching and current matching are very important. The current index of the charger determines the charging time. The higher the current index, the faster the charging speed; For example, 3A is faster than 1A.
The second is the more regular judgment is the color change of the indicator light of the charger or the light on the electrical appliance, which is usually changed from red to green, which indicates that it is full.
In addition, it is a bit professional to measure the voltage of electrical appliances. The battery's power is different, and its terminal voltage is different. The less power is, the lower the voltage is. Therefore, the voltage of the battery has a range, from the lower limit that can make the electrical appliance work normally to the full charge. For example, the mobile phone uses a lithium battery, and the working voltage range is 3.7~4.2V; Suppose the electricity is divided into three squares:
When the lithium battery voltage is 3.7~3.8V, the battery voltage is 3.8~3.9V, one cell;
When the lithium battery voltage is 3.9~4.1V, two cells are measured. When the battery voltage is 4.1~4.2V, the full grid is displayed.
A good quality charger will detect the voltage and current to determine whether it is full. However, if it is a poor quality charger, it is likely that it will not do so. It is completely charged by the over-current and over-voltage protection of the lithium battery itself. It will automatically cut off the current until the battery itself detects over-voltage, and then tell you that the charging is complete.
General charger is constant current charging. Smart lithium battery chargers usually take a while rather than immediately be able to determine whether the battery is just fully charged.
The lithium battery can be judged directly according to the battery voltage. When the voltage exceeds the set cut-off voltage (usually 4.2V), the battery is considered to be fully charged; the higher-level charger uses a joint judgment of voltage and current. When the voltage is close to the cut-off voltage, it is switched to constant voltage charging. When the current is less than a certain set value, it is considered that the battery is fully charged.
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