What Is a Charging Current?

The movement of some charged particles creates a current. These particles are physically called free charge. If the current is likened to water and the conductor is likened to a water pipe, when water flows in a directional direction in the water pipe, a water current is formed. Electric current is formed by the directional movement of free charge.

The movement of some charged particles creates a current. These particles are physically called free charge. If the current is likened to water and the conductor is likened to a water pipe, when water flows in a directional direction in the water pipe, a water current is formed. Electric current is formed by the directional movement of free charge.

Chinese name

recharging current

If you want to fill the bucket with water, you must first turn on the faucet to let the water flow into the bucket continuously, and finally fill the entire bucket. So how does the charger charge the battery?

First let's understand what is current? The flow of water forms a water current. Similarly, the movement of some charged particles creates an electric current. Physically we call these particles free charge. We can compare the current to water and the conductor to a water pipe. When water flows in a directional direction in the water pipe, a water flow is formed. Current is formed by the directional movement of free charge, as shown in Figure 1.

Figure 1 Current

After the battery is discharged, direct current is passed through the battery in the opposite direction to the discharge current to restore its working ability. This process is called battery charging. When the battery (for example, a mobile phone battery) is charged, at this time, the current continuously flows into the battery, forming a charging current, as shown in FIG. 2.

Figure 2 Current flow

When the battery is charged, the positive electrode of the battery is connected to the positive electrode of the power supply, and the negative electrode of the battery is connected to the negative electrode of the power supply. The voltage of the charging power source must be higher than the total electromotive force of the battery. There are two types of charging methods: constant current charging and constant voltage charging.

We know the charging current, so what determines the charging current? Generally speaking, in a communication power system, the most important thing is that the rectifier determines the size of the charging current, which is what we often call a "charger". Let's look at our mobile phone chargers. Are they marked with "rated voltage" "," Rated current "? The greater the rectifier power, the greater the charging current.

Now that we know that the rectifier determines the size of the charging current, is it time for us to change to a high-power rectifier when charging? Is it fast to charge, so there is no need to wait? In fact, most of the batteries we use are liquid batteries. There is an electrolyte inside the battery. When the battery is charged, the internal electrolyte of the battery chemically reacts, and at the same time, heat and gas are generated. When the charging current increases, the electrolyte's reaction speed It also speeds up, so that it will generate more heat and gas, and it is easy to explode. Therefore, this method is very dangerous. Don't covet the speed and ignore the safety.