How to check whether the battery being fully charged

A simple method is to measure the open circuit voltage of battery, which is using battery OCV curve and open circuit voltage curve

Battery in the case of open is not pick up the load voltage is proportional to the battery capacity, for example, may represent 11.6 V battery capacity 13 V may represent 10% to 90%

Different batteries have different characteristics, but in general as long as the open circuit voltage to 13 v basic capacity is above 90%

The effect of voltage ammeter is not show the current value of the battery voltage and current, but the charger output current charging voltage and charging current. The charger should be overcharge protection function, after the battery is full, it will automatically cut off the output, stop charging. Of the 12 v battery select 20 a large current charge, has the damage on the battery. Unless the battery supply, normal voltage current will be able to charge the case can be used for a while.

Now that is fully automatic, the charger should be overcharge protection function, after the battery is full, automatically cut off the output, and stop charging.

In addition, the 12V battery, select 20A large current charge, will have great damage to the battery. Unless the battery supply, normal voltage current will be able to charge under the condition of use for a while.

If use the view of intelligent charger is full of charge indicator light changes; Automatic, manual charger to view the change of the charging current, charging current is less than or close to 5 a, it should be full of normally 12 v65ah battery charging 6 ~ 7 consecutive hours to remove the charger.

Lead-acid battery can provide power is the most important components of positive and negative plate message solution liquid. Battery has liquid suppository, mouth plug function for gas produced during the discharge charge and replenish water, determination of proportion.

Generally accurate measurement by measuring the proportion of basic confirm whether full, battery fluid density and the battery status:

1, plenty of battery: 1.2750-1.285;

2, put the power of 30%, 1.170 to 1.190

3, put the power of 100%, 1.050 to 1.070.

If it is from maintenance battery (no liquid suppository, basic don't need to add distilled water) within the service life of the battery, need according to the discharge of float charging voltage to determine whether to filled in the form of single battery only nominal voltage 12 V, floating in a state of acid single battery voltage 13.5 14.5 V can be thought of as a full charge (not accurate), measure the voltage open basic can achieve 16-17 V, the battery is full.

Electric vehicle batteries, such as the upstairs said, turn lamp is full. But no charge, charge of electricity, mostly used for electrolysis of water, and water loss is the important failure modes of the electric car battery.

Other lead-acid batteries, under the set of charging voltage, the average is 14.7 V, when the charging current is less than 0.005 C that can be considered a full charge.

Charging indicator light, green light is full of,

Close to 0 is full of ammeter, current,

The time calculation depend the size of charging current.

1, battery generally stay above 20% electricity, battery charging chemical conversion efficiency is about 50%, full of the battery needs to increase 150% * 80% of the battery.

2, the optimum battery charging current is 10% of its capacity, however, charging time need 150% * 80% / 10% = 12 hours, plus 1 hour or so piecewise charging time increases.

3, in order to comply with the schedules of people, design, generally USES 13% of the charging current capacity, the charging time for at least 150% * 80% / 80% = 9.2 hours, plus 1 hour or so piecewise charging time increases.

4, fast charging, general with 20% of the capacity of the battery charging current, charging time is 150% * 80% / 20% = 6 hours. Use a large current charging, although the charging time, however, has damage to the battery, use carefully.

Battery charging time is determined by capacity, not voltage.

Charging current generally choose 10% of the capacity of the 10 hours rate, the maximum current is not more than 30% of the rated capacity value, if the charging current is too large, the battery is easy fever, plate bending, fall off, rupture, short circuit that caused the explosion, burning and other accidents.

Charging time (hours) = rechargeable battery capacity (Ah)/charging current (A) * 1.5 coefficient.

For example: suppose that the battery is 30 ah, is: 30/3 * 1.5 = 15 (h)

Battery charging time is mainly determined by the battery capacity and charging current. One over ten of the standard of charging current for the battery capacity, such as battery capacity of 20 ah charging current is 2A. Constant voltage charging voltage of 14.4 V.

Float charging voltage 13.8 V, current is less than 0.01 C (120 * 0.01 = 1.2 A) the following, can be regarded as full.

Only need to measure the current value, is completely can be measured directly measured with ammeter.

Chemical energy is converted into electrical energy device is called chemical battery, commonly referred to as "for the battery. After discharge, can make the internal active substances in charging way - to store the electric energy to chemical energy regeneration; When it need to discharge to convert chemical energy to electrical energy again. Call this type of battery storage battery (Storage battery), also known as the secondary battery.

So-called battery is chemical energy storage battery, a electrochemical device to release electricity if it's necessary.

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