Precautions for the use of lithium battery charger

Charger knowledge Battery Knowledge

1) About cell voltage

The battery cell voltage of the ternary lithium battery is 3.7V;

The cell voltage of the lithium iron phosphate battery is 3.2V.

2) About nominal voltage

Whether it is a ternary lithium battery or a lithium iron phosphate battery, the most common nominal voltage specifications on the market are 48V, 60V, and 72V.

3) About the number of cell strings

The number of battery cell strings varies depending on the nominal voltage of the battery. For example:

Number of 60V ternary lithium battery core strings: 60V/3.7V = 16 strings,

Number of core strings of 60V lithium iron phosphate battery: 60V/3.2=19 strings.

4) About single string charging voltage

From a professional point of view, charging is a process of transition from high voltage to low voltage, so the single string charging voltage must be higher than the voltage of the battery itself;

For example:

The cell voltage of the ternary lithium battery (3.7V) is less than the single string charging voltage (4.2V); the cell voltage of the lithium iron phosphate battery (3.2V) is less than the single string charging voltage (3.65V)

5) About the charger

The size of the charger voltage also varies with the number of battery strings;

For example:

Charger voltage of 60V16 series ternary lithium battery: 4.2V * 16 series = 67.2V; The charger voltage of 60V19 series of lithium iron phosphate batteries is 3.65V * 19 series = 69.35V, and the charger voltage in the following figure is 60-73V, which can be used to charge 60V lithium iron phosphate batteries.

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Charger classification | Battery Classification

Chargers are classified according to battery types. Common chargers are: lead-acid battery chargers, lithium iron phosphate chargers, ternary lithium battery chargers, nickel-metal hydride battery chargers, nickel-cadmium battery chargers, etc.

Select the right How to choose the right charger

The current research report shows that most of the lithium battery accidents are caused by the charger. So the choice of lithium battery charger is very critical, then how to choose the right lithium battery charger:

1. Voltage adaptation principle

Take the choice of phosphoric acid battery charger as an example:

-- If your lithium battery voltage is 48V, you cannot choose a lithium battery charger with an input voltage greater than 54.75V, nor can you choose other types of battery chargers with an input voltage smaller than 54.75V. You can only choose a lithium battery charger with an input voltage of 54.75V.

-- If your lithium battery voltage is 60V, you can only choose a lithium iron phosphate battery charger with an input voltage of 69.35V, and you cannot choose a charger with an input voltage less than or greater than 69.35V, and you cannot choose a charger for other types of batteries.

-- If your lithium battery voltage is 72V, you can only choose a lithium iron phosphate battery charger with an input voltage of 83.95V, and you cannot choose a charger with an input voltage of less than 83.95V.

2. Current adaptation principle

The current of the charger should be matched with the lithium battery. Don't try to charge the low-current battery with a high-current charger, because the high-current charger will increase the internal resistance of the battery and damage the protection board, thereby reducing the service life of the lithium battery.

3. Charging interface adaptation principle

Common lithium battery charging interfaces include pin head interface, three horizontal bird interface, three vertical interface, round head interface, Giant interface, and the most commonly used lithium battery plug for two-plug electric vehicles is the three vertical interface.

In addition to the above small tips, we should also have an understanding of our own electric vehicle batteries. Before buying a charger, we should consult a professional person, instead of just buying a charger to charge the battery. In the end, the damage to the battery due to the charger problem is not worth the loss.

Precautions for the use of lithium battery charger

Five

1. Plug in the battery socket before turning on the power supply

2. Lead-acid battery chargers cannot be used to charge lithium batteries, and lithium battery chargers cannot be used to charge lead-acid batteries

3. When charging, keep away from flammable and explosive materials

4. Lithium battery charger should be with the car, not at home

5. It is strictly prohibited to open the lithium battery charger for maintenance

6. If you do not use the lithium battery charger for a long time, you should put the charger in a cool and dry place to avoid moisture damage to the lithium battery

7. When charging, because the charger will emit heat, it is necessary to ensure ventilation around the charger

8. When charging, the charger shows a red light; When charging is completed, a green light will be displayed. If the light flashes or the light is not on, the charger is broken and should be replaced in time.