The charging methods of 12V storage battery

The maximum charge termination voltage of the 12V battery is 16.8V, and the rated online working voltage is 14-14.4V (the rated online working voltage can be understood as the voltage output by the generator through the regulated rectifier), and the charging voltage must be at least 14-14.4V. In fact, this voltage is not enough to fully charge the battery to the maximum capacity, because the battery reaches the maximum capacity of 16.8V. This line voltage can maintain the battery capacity.

The AC mains are 50 Hz sine wave, the ideal output voltage of 12V AC after full bridge rectification is the root number 2 multiplied by 12 minus the rectifier voltage drop and then the internal resistance voltage drop. It seems that the battery can be charged, but actually the voltage is too low, and after loading, it can only be calculated by 1-1.2 times AC input. In addition to the fluctuation of the listed power, it is obvious that the 12V AC transformer cannot recharge the battery to achieve the highest capacity. If you say that the 12V power supply is 12V DC output, it is even worse.

For 12 v motorcycle battery charging, can choose the output current is greater than 1 amp in 15 to 24 v ac voltage transformer, on the primary series about 40-100 - w a lamp lighting bulbs current limit (the light bulb's specific power, related to the transformer output voltage), transformer secondary use half wave or full wave or used after full bridge rectifier. Use lighting lamp current limit, not afraid of the secondary output short circuit, have enough output voltage of battery (6 v, 12 v can be filled), and change the size of the light bulb can be used to adjust the actual charging current.

And, it can also be on the secondary transformer series a 24 v10-40 w auto bulb as current limit.

Basically modification is possible.

The battery is DC, so the AC of the transformer is converted to DC. Generally, a full-wave bridge rectifier circuit is used.

In order to save energy and save money, you can use half-wave rectification, or use a diode. If the output current is too large, you can connect a car headlight bulb in the line.

Because the 12 volt AC is the average, its maximum voltage is 16.96.

Just the charging current is big, the last is very small, charging time may be too long, but not bad battery charge.

The 12 v battery charging operation procedures

1. The preparing work before charging:

1.1 The starting battery may be depleted due to a large discharge of the battery or long-term storage. Therefore, the battery should be removed from the device periodically, and the battery should be recharged in the charging room. Recharge is usually done once a month to improve its reliability and extend its service life. It is best to make a supplementary charge when entering the winter.

1.2. Before charging, measure the voltage of the battery with a universal meter and record it to determine the charging scheme according to the power loss of each battery.

1.3. Check that the AC power supply meets the requirements for use. The power supply should be 220V, 50Hz AC.

1.4. After the accumulator, the charger "+" extremely connected to battery "+", "-" very connected to battery charging machine "-"

On the terminal post, pay attention to prevent short circuit of load. 1.5. Select the charging voltage. If the rechargeable battery is 12V, the voltage selection file should be rotated to 12V; if the rechargeable battery is 24V, the voltage selection file should be rotated to 24V. Wrong selection is not allowed, otherwise the charger or battery will be damaged.

2. The charging operation:

2.1. At the beginning of charging, supplementary charge often adopt constant current charging (constant current charging is in a certain period of time to do not

For battery charging current, its advantage is charging is complete, but almost all late current consumed on the decomposition of water and heat).Supplement the charging current of 0.1 C20A (e.g., 60 ah battery with 6 a), the charging time is 3 ~ 5 h, or deposit according to the length of time to determine the charging time.

2.2 maintenance charge often adopt constant voltage charging (constant voltage charging is always at a constant voltage to charge batteries, the advantage is very little gases, water consumption is small, charging is not completely flawed. Monomer voltage is usually set in 2.3 ~ 2.4 V (The 12 v battery13.8 ~ 14.4 V, 6 V battery is 6.9 ~ 7.2 V), until sufficient electricity).

2.3. Will choose gear charging mechanical and electrical current to the lowest gear.

2.4. Make sure that the red, black clip did not touch can only live, otherwise it will cause a short circuit and damage to the machine.

2.5. Charging uses a two-step charging method:

2.5.1. The first step is to charge 13.8 to 14.4V with a 0.1C20A battery and 6.9 to 7.2V for a 6V battery. Transfer to the second step of charging, the second step of charging using 0.05C20A to the end of charging.

2.5.2. On 220 v power supply, by adjusting the charging current, to maximum charging current C20A 0.1, the first step to recharge.

Namely: for 12 v, 54 ah battery, the charging current of 0.1 x54 = 5.4 A,

For 12 v, 150 ah battery charging current of 0.1 x150 = 15 A

2.5.3. When the battery voltage is 13.8 ~ 13.8 V, charging into the second step, the second step maximum current charging 0.05 C20A.

Namely for 12 v, 54 ah battery, the charging current of 0.0511 x54 = 2.7 A, for 12 v, 150 ah battery charging current 0.05 x150 = 7.5 A

2.5.4. After the battery is fully charged, the battery is finally balanced and charged to ensure the cell balance. The method is: charging a fully charged battery with a current of 0.035C20A (ie 12V, 54Ah battery charging current is 0.035x54=1.89A; 12V, 150Ah battery charging current is 0.035x150=5.25A); when the battery emits uniform bubbles, When the temperature rises, the charging is stopped for 1 hour; if it is repeated 3 to 4 times, the single cell can emit uniform bubbles, and the battery voltage and electro-hydraulic density tend to be constant.

2.6. Determination of charging time:

Replenishment time and battery voltage correspondence (reference): battery voltage replenishment time 12.55-12.45V 2hours 12.45-12.35V 3hours 12.35-12.20V 4hours 12.20-12.05V 5hours 12.05-11.95V 6hours 11.95-11.80V 7hours 11.80-11.65 V 8hours 11.65-11.50V 9 hours 11.50-11.30V 10 hours 11.30-11.00V  12 hours 11.00V below  14 hours.

2.7. After the charging is completed, check the color of the battery electric eye (maintenance-free battery, the same below). The electric eye is green, indicating that the battery is fully charged. If the electric eye is black, check if the charging cable is securely connected, whether the connection point is clean, whether the charging voltage reaches 16 volts, and continue to recharge.

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