KR20020035026A - The control system that the storage battery for quick charging can full charged - Google Patents

Abstract

PURPOSE: A full charge controlling method of a battery for rapid charge is provided to fully charge and safely use the battery without over charging and life time reducing. CONSTITUTION: In a full charge controlling method of a battery for rapid charge, variation of a terminal voltage per a unit time is detected by a detector, e. g., 20-25 times per a second, while a current is supplied to charge the battery after the battery is turned on and a timer is started. When the variation of the terminal voltage per the unit time increases rapidly and then decreases steeply, a microprocessor determines that the battery is fully charged and controls the charging current to the battery to be blocked. When the detector can not detect the variation of the terminal voltage per the unit time, the microprocessor controls the charging current to the battery to be blocked if the timer reach a preset value.

Description

The control system that the storage battery for quick charging can full charged}

The present invention relates to a full charge control method of a fast-charge battery, and more particularly, as the temperature of the battery rapidly rises due to the heat of oxidation reaction caused by the electrolysis of electrolyzed water at the end of the charge, when the terminal voltage which rises relatively slowly during the charge of the battery is increased. As the chemical reaction proceeds actively inside the battery and the internal resistance decreases rapidly, the full charge control method of the fast charging battery for determining the completion time of charging by detecting the rising and falling time of the terminal voltage per unit time progressing at this time will be.

Conventional battery charging methods can be classified into constant current charging method and quasi-constant current charging method.

The constant current charging method is a method of charging by supplying a constant current of 0.07 ~ 0.14 A (amperes) .It is safe to use because it has little effect on the battery even if it is overcharged due to the low temperature rise during charging. ~ 8 hours), and it is difficult to detect full charge, resulting in a drawback that the life of the battery gradually decreases due to an increase in temperature due to overcharge.

In addition, the quasi-constant current charging method connects a resistor in series between a power supply and a battery of constant voltage, and changes the current value in the range of battery voltage change, allowing rapid charging according to the current value. It is possible to manufacture the charger at low cost, but it is difficult to capture the charge due to the change of the current during charging, so it is not possible to confirm the full charge. There has been a flaw.

Accordingly, the present invention has been made to solve the above problems, and based on the constant current charging method, the comparison width between the rise value and the fall value of the terminal voltage per unit time according to the temperature rise and the rapid decrease of the internal resistance of the battery is determined by micro. After detecting by the process, the charging current is cut off so that the battery can be fully charged without overcharging, and the battery can be used more safely without shortening the life of the battery by blocking the overcharging again with an internal timer in case the detection is impossible due to the ambient temperature. With the main focus on making it possible, the technical task was completed.

1 is a flow chart of a control method showing a preferred embodiment of the present invention

2 is a block diagram showing a preferred embodiment of the present invention

3 is a waveform diagram showing a preferred embodiment of the present invention

■ Explanation of the major symbols used in the main parts of the drawings ■

1: power supply 2: D / C converter

3: constant current circuit 4: battery

5: detector 6: A / D converter

7: Micro process 8: Timer

9: breaking circuit 10: amount of change

1 is a flow chart of a control method showing a preferred embodiment of the present invention, Figure 2 is a block diagram showing a preferred embodiment of the present invention, Figure 3 is a waveform diagram showing a preferred embodiment of the present invention The full charge control method of the fast charging storage battery provided by the present invention through this in detail as follows.

The present invention provides a constant current charging method for connecting a resistor between a power supply and a battery of a constant voltage in series and charging while varying a current value within a variation range of a battery voltage;

Normally, a direct current of a constant current stabilized at a constant voltage is injected into the storage battery 4 by converting an alternating current conducted by the power supply unit 1 for applying an alternating current power into a direct current in the direct current converter 2 and passing through the constant current circuit 3. The terminal voltage during the charging of the storage battery 4 as the charging progresses in the situation where the constant current circuit 3 becomes the constant current from the initial charging current to the constant current based on the constant current charging method to enable the rapid rapid charging. Although it rises relatively slowly, the end of charge has a nature of sharp rise.

At this time, since the charging is almost completed, if the battery is continuously charged in this state, electrolysis of the electrolyzed water occurs and the temperature of the storage battery 4 rapidly increases due to the heat of oxidation reaction.

As such, when the temperature of the battery 4 rises, a chemical reaction is actively generated therein. At this time, since the internal resistance of the battery 4 decreases, the terminal voltage of the battery 4 is inevitably reduced, and thus the terminal voltage per unit time is increased. After a sharp rise, a sharp drop occurs.

In order to check and confirm the above phenomenon, as shown in FIG. 2, the Michael process 7, the timer 8, and the A / D converter 6 are configured in the conventional quasi-constant voltage charging scheme. As shown in Fig. 3, the amount of change in the terminal voltage per unit time occurring during the charging process is detected. As the terminal voltage suddenly increased at the end of the charge is rapidly decreased in the internal resistance, the amount of change in the terminal voltage that falls rapidly is detected by the detector 5. Detects and transforms the A / D converter 6 to digitize it with the micro process 7 and cuts off the charging current when the detected value is larger than the set reference change amount to complete the current charging.

That is, when charging of the battery 4 starts, the microprocessor 7 measures the terminal voltage of the battery 4 20 to 25 times per second using the A / D converter 6 to continuously increase the voltage. If the terminal voltage is rising, the data is continuously stored. If the terminal voltage is falling, it is configured to stop charging after a certain time compared to the previously stored data.

In addition, even if the charge voltage detection at the end of the charge is insufficient or impossible due to a decrease in the amount of change in the terminal voltage due to an increase in the temperature or the ambient temperature generated during the charging process, the charging current is maintained after a certain time by the internal timer 8. It is to prevent the damage of the battery 4 due to overcharge by blocking the current to complete the charging.

This type of charging method is expected to be applied to the charging of various kinds of batteries because the charging of any type of battery is possible only by modifying the current value of the constant current circuit 3 and the micro process 8 when the current and voltage to be supplied are determined.

As described in detail above, the full charge control method of the fast charging storage battery of the present invention not only enables rapid charging but also prevents overcharging due to the suspension of full charge capture, which further prolongs the sleep of the battery and also 100% full charge. It is a great invention that it is expected to be applicable to the charging of various kinds of batteries because it is transferable.

Claims (2)

The direct current of the constant current which is stable at a constant voltage is injected into the battery 4 by converting the alternating current conducted by the power supply unit 1 for applying the alternating current into a direct current through the constant current circuit 3. In the charging process of the storage battery 4 which enables charging; As the terminal voltage suddenly rises at the end of charging, it drops rapidly as the internal resistance rapidly decreases. Therefore, the charge current is detected when the detected value is greater than the set reference change amount by detecting the change amount of the terminal voltage per unit time according to the falling degree at the rising point of the terminal voltage. Full charge control method of a fast-charge battery, characterized in that to prevent the battery to be fully charged safely without overcharging. The method of claim 1; Even if the detection of the charging voltage at the end of charging is insufficient or impossible, the internal current (8) cuts off the charging current after a certain time to complete the current charging to prevent damage to the battery (4) due to overcharging. Full charge control method of a fast-charge storage battery, characterized in that.