I want to use a 5V charger to charge a 3.7V lithium battery. I know it can't be charged directl

Introduction I want to use a 5V charger to charge a 3.7V lithium battery. I know it can't be charged directly. Can any expert give me a conversion circuit so that this idea can fully charge the lithium battery?

I want to use a 5V charger to charge a 3.7V lithium battery. I know it can't be charged directl

The voltage of a fully charged lithium battery is between 4.2 and 4.4 V. The rated voltage of the charger is 4.2 V. The actual voltage is around 5 V, and some reach more than 6 V. I don't know if your battery has bare cell or original cell. If it has only one cell, you need to add a protection circuit (old batteries are removable and available on Taobao. If it is original battery, just use). a universal charger.

The lithium tram battery I assembled is 48V 12AH. What type of protective panel is suitable and how to connect the lines?

No.

There are two types of lithium batteries:

Lithium-ion batteries do not contain metallic lithium and are rechargeable.

Lithium metal batteries are disposable batteries and cannot be recharged.

Non-rechargeable batteries are called disposable batteries. EllThey can only convert chemical energy into electrical energy once and cannot return electrical energy to chemical energy. Such as lithium manganese dioxide primary batteries and lithium thionyl chloride primary batteries.

Rechargeable batteries are called secondary batteries (also called storage batteries). It can convert electrical energy into chemical energy and store it when used, it can convert chemical energy into electrical energy, like common lithium-ion mobile phone batteries on the market.

Detailed information:

< p>Lithium metal battery:

Lithium metal battery generally uses manganese dioxide as the positive electrode material, lithium metal or its metal alloy as the negative electrode material, and uses solution electnon-aqueous rolytic.

Discharge reaction: Li+MnO2=LiMnO2

Lithium batteries were first used in pacemakers. Lithium batteries have the advantages of extremely low self-discharge rate and gentle discharge voltage, allowing pacemakers implanted in the human body to work for a long time without recharging.

Lithium batteries typically have a voltage rating above 3.0 volts and are more suitable for integrated circuit power supplies. Manganese dioxide batteries are widely used in calculators, digital cameras and watches.

Disadvantages:

1. Primary lithium batteries have poor safety and explosion risk.

2. Lithium-ion batteries based on lithium cobalt oxide cannot be discharged at high currents, are expensive and unsafe.

3. The batteriesithium-ion batteries require protection circuits to prevent the battery from being overcharged or discharged.

4. The production requirements are high and the cost is high.

5. The conditions of use are limited, and the use of high and low temperatures is very dangerous.

References:

< p >Baidu Encyclopedia - Lithium Battery

When choosing a protection board, you should first consider the material used in the lithium battery, i.e. whether it is a lithium-manganese or phosphoric acid battery. batteryLithium iron battery.

After determining the cell material of the lithium battery, the protected version model can be determined by determining the number of batteries in series and the maximum value of vehicle charging and discharging current electric.

For online connection, it is difficultto explain in a few words. Usually, the protection board is divided into two types: the same port for charging and discharging ports and the separate port. It is more convenient to wire the same port. According to the protection board, charging and discharging can be connected to the same point; the separate port is generally divided into two types: the thinner and thicker one is the charging port, which is connected to the charger connector; the thicker one is the discharge port, which is usually connected to the motor.

I hope the above is helpful to you.

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