KR20060009508A - How to charge the charger for small rechargeable batteries - Google Patents

Abstract

The present invention relates to a charging method employed in a small battery charger.

For small batteries, especially nickel cadmium (Ni / Cd) nickel-metal hydride (NiMH) batteries, voltage tracking (d2 ² / vdt2 ² ,-△ V, Vmax = peak detection), temperature tracking (△ T, dT / dt) Although the most common and accurate method is the method of finding the charging completion by tracking -ΔV.

However, the tracking method is not accurate due to various variables such as the change of charging voltage, the unique charging characteristics of the manufacturer, the characteristics of the charger itself, and the battery is not fully charged. As it turns out, charging is not working properly.

The present invention avoids the fully charged voltage drop value from being fixed in one unit of -ΔV as mentioned above, among the various voltage tracking methods, and the basic voltage drop value (-ΔV × n = NΔV). It was actively enlarged or reduced by n times of V). The voltage drop was adjusted in inverse proportion to the increase of the internal voltage as the charged battery was charged. In addition, by using the temperature tracking method, it is possible to repeatedly detect the detected data with a certain period, and at the same time, the charging completion of various variables such as the maximum charge time, the maximum charge voltage, the temperature, the full charge voltage, and the reference voltage It was used as a variable to judge. Therefore, the full charge detection, which was judged by one or two variables, was performed to obtain more accurate charging function by obtaining the exact time of full charge by complex and cross control of these variables.

Description

How to charge a charger for a small rechargeable battery {Battery recharging process for the small size rechargable battery}

1 is a charging characteristic graph between time and voltage when charging is normally performed;

2 is a charging characteristic graph when the charging is completed by detecting the full charge completion voltage drop value before charging is performed;

3 is a charging characteristic graph in which an uncharged state is reached while exceeding the maximum charge allowable time without a full charge completion voltage drop value being detected before full charge;

4 is a block diagram showing an internal configuration of a battery charger;

5 is a charging characteristic graph according to the charging operation of the present invention,

6 is a charging characteristic graph according to the temperature change of the present invention,

Figure 7 is a charging step flow chart, including a full charge completion voltage drop value resetting step of the present invention,

8 is a flowchart of a charging step including a full charge completed voltage drop value reset and a reference voltage value reset step of the present invention.

<Explanation of symbols for the main parts of the drawings>

NΔV: Fully charged voltage drop value, 1: Rectifier section 2: Output voltage control section 3: Output switch section 4: Battery charging section 7: Visual display section, 8: Sound display section W: Temperature signal detection line P: Voltage signal detection line

The present invention relates to a charging method for a charger for a small charging battery composed of nickel card mulle or nickel hydrogen.

In general, the spent nickel-cadmium or nickel-hydrogen batteries are recharged using a battery charger and used again. At this time, a constant continuous current flows to the batteries to recharge the batteries. Rapid charging until the voltage peak) (hereinafter referred to as full charging) and the rest is charged by reducing the charging current.

As such, when charging the battery, various methods for detecting the full charge have been proposed in order to allow the battery to be fully charged.

That is, a timer method for charging for a predetermined time after the start of charging, a falling reverse voltage (= basic voltage drop value (-ΔV), -ΔV) for detecting the falling reverse voltage of the battery voltage and stopping the charging; For example, a temperature detection method for stopping charging when a constant temperature is reached, and a gradient change detection method for measuring a voltage rise that stops charging when a predetermined change in the slope of the voltage rise occurs by measuring a change in the slope of the voltage rise.

Among these methods, the most commonly used method is a falling reverse voltage detection method. FIG. 1 shows a normal state of charge of a battery. The voltage of a nickel-cadmium or nickel-hydrogen battery increases with charging time to reach a peak voltage. Until the charging state is progressed.

After the peak voltage is reached, the nickel-cadmium or nickel-hydrogen battery does not increase due to its unique phenomenon, but rather begins to decrease slightly. Detects-△ V of cadmium or nickel-hydrogen battery voltage and immediately stops fast charging or switches to charging by microcurrent.

That is, it is possible to know that the state of charge of the battery is full by detecting -ΔV generated after full charge due to the characteristics of the nickel-cadmium or nickel-hydrogen battery.

However, in the conventional battery full charge detection method as described above, the method using -ΔV is charged at the beginning of the charge as shown in the diagram shown in Figure 2 if the charge without using the nickel-cadmium or nickel-hydrogen battery for a long time- When ΔV is generated to stop charging, and when the battery voltage gradually drops in the middle of the charging, as shown in the diagram shown in FIG. 3, -ΔV is generated to stop the charging in a substantially uncharged state. There was a problem that the charging of the battery is stopped.

In addition, even in the timer method of charging for a predetermined time, the difference in the charging amount is generated depending on the ambient temperature and the remaining battery charge, and even when the battery is mounted in the charger, the battery is charged for a predetermined time regardless of the state of charge of the battery, thereby causing overcharge. .

In addition, the temperature detection method for controlling charging by detecting reaching a certain temperature also has a problem in that an error occurs due to the influence of the ambient temperature change and the exothermic temperature of the charger, which results in uncharging.

In addition, the method of detecting the change in the slope of the voltage rise is used in parallel with the method using -ΔV, which causes a problem that the charging is stopped when the initial peak voltage or -ΔV occurs during the charging process. The temperature of the battery rises, which contributes to the shortening of the battery life.

In order to improve this disadvantage, Patent No. 216627 measures the charger supply voltage and the charging battery terminal voltage at different times, and calculates the slope of the battery internal resistance increase by calculating the difference in the measured voltages as a time change rate. And a full charge detection method of a rechargeable battery, characterized in that it detects a full charge state when the slope of the internal resistance rise is higher than the set slope by comparing the slope of the internal resistance rise with a preset slope, wherein A full charge detection method for a rechargeable battery characterized by intermittently supplying current by a charger and a full charge detection method for a rechargeable battery characterized in that the supply time and supply pause time of the charging current are set to 7: 1. Also presented together.

The method of the above patent is characterized by measuring the internal resistance to accurately detect the full charge point as possible. However, the manufacturers of batteries vary widely, and the batteries produced by each manufacturer vary greatly in internal resistance. In other words, when one relies on the measurement of a uniform internal resistance change value, the accurate detection of the full charge time point is far less than expected.

In addition, Patent No. 284646 introduces a trickle charge stage, which is performed just before the time when the temperature rises rapidly, followed by a trickle charge stage where charging is performed by a very short charge current time. To achieve a stable full charge effect.

However, this method also depends too much on the charging environment because other charging variables are dependent on the temperature rise only. In particular, a large number of charging errors are generated when uniformly applied to various battery types.

In addition, even if the battery is small, the charging capacity varies from 500 ㎃ to more than 2000,. As a result, it is almost impossible to change the range of the full charge detection variable for each battery according to its capacity.

Particularly the most problematic point is that small charging batteries usually come in about 10-20 mV during fast charging (e.g. from 2 hours to 4 hours), but at higher charging times, the basic voltage drop (-ΔV) is usually at 2 ㎷. At most it is set to about 5㎷. In other words, in the small AA or AAA type battery at 1.2V, such a slight change in the basic voltage drop value (-ΔV) is caused by various reasons. This may occur due to the slight fluctuation of the charging voltage and the physical vibration of the outside of the charging device, and also occurs in various ways depending on the battery characteristics of each battery producer. As a result, more than 90% of the battery is not fully charged, and in the case of a small battery, almost 50% of the uncharged or incomplete charging time is shown in reality.

Specifically, as shown in FIG. 5, even before charging is sufficiently performed, a phenomenon in which the voltage value rises sharply and rapidly falls in the middle is generated, and the sudden drop of the voltage is a fully charged voltage drop value stored in the microprocessor. Charging ends when it is recognized. Particularly problematic is that the battery deteriorates and repeats its uncharged state as this phenomenon is repeated several times. As a result, according to the memory characteristics of the Ni-cad battery, the battery always recognizes the uncharged state as a full charge, resulting in poor performance and eventually discarding the battery.

According to the present invention, when the measured voltage of the basic voltage drop value (-ΔV) is changed according to the state of charge of the battery under a certain voltage as the full charge voltage is approached, the multi-measurement of the full charge voltage drop value is currently being charged. While the charging is incomplete as the voltage rises, the basic voltage drop value (-ΔV) is detected even though the charging is incomplete.

The present invention also prevents the charging operation from starting when the battery temperature is measured above a certain temperature at the start of the charging operation, or charging or closing the charging operation with a weak current (for example, a few minutes of the existing current). It is to provide an operation signal of non-charging, and at the same time, to measure the change in temperature and the change in the basic voltage drop (-ΔV) as a variable at the same time to provide a method to accurately detect the full charge time.                         

The present invention also regenerates the performance of the battery by repeatedly detecting and discharging the battery when the battery performance deteriorates due to prolonged discharge or nonuse of the battery. Also wish to provide.

In another aspect, the present invention is to provide a charger capable of automatically converting the charge capacity according to the battery by changing the various detection variables for detecting the full charge by determining the capacity increase when the capacity is increased during use.

According to the present invention, as the small battery is charged, the battery voltage gradually increases, and in proportion to this increase rate, initially n times the basic voltage drop value (-ΔV) and the internal voltage rise of the battery, that is, the charge proceeds. The value of the full charge voltage drop is set so that the value of n is gradually lowered while n times the basic voltage drop value (-ΔV), so that the comparison between the basic voltage drop value (-ΔV) and the reference value becomes 0 digit immediately before the final full charge. It relates to a small battery charging method configured to set (NΔV) to lower the measurement range in inverse proportion and a charging device using the same.

In the present invention, since n is set to a number close to 10 during initial charging, the initial full charge voltage drop value is initially set to 10 times or more than the basic voltage drop value (-ΔV), and when the full charge is close to n, Set to 0 or 1 to stop charging by measuring the basic voltage drop (-ΔV), and then stop the charging operation without the operation of charging and discharging according to the measurement of the full charge completion voltage drop.

Another feature of the present invention is that the battery is charged while changing the reference voltage value (Vf) that is the reference value of the full charge completion voltage drop value is changed according to the state of charge of the battery to achieve a more precise charging operation To lose.

The present invention also allows the battery to be regenerated by repetitive charging and discharging, even for batteries whose initial voltage required for charging and regeneration is not measured or no voltage is detected, thereby restoring the original battery activity. The present invention relates to a small battery charging method and an apparatus for charging the battery.

The present invention also measures the temperature of the battery to be charged to suspend the charging operation itself when a certain temperature abnormality is detected, and furthermore, it is possible to stop the charging operation itself when the temperature of the battery is above a certain temperature. The present invention relates to a method for preventing the risk of battery, device damage, and fire caused by heat, and a charging device using the method.

Hereinafter will be described by specific embodiments of the present invention.

The charging voltage change and the temperature change according to the temperature of the charged battery of the present invention are shown in FIG. 6, and the charging step while resetting the full charge completion voltage drop value is shown in FIG. 7, and FIG. 8 is a full charge completion. The flowchart shows the charging process while changing both the voltage drop value and the reference voltage value.

The present invention outputs to the naked eye display unit 7 while proceeding to the battery inspection, memory scanning, charging and discharging stages according to the battery inspection, history inquiry, charge / discharge mode selection mode mounted on the battery charging unit (4), charging or discharging As the mode is selected, charging or discharging is performed and the voltage of the mounted battery is checked to determine the maximum charging allowable voltage (Vmax), the charging target voltage (V ₀ ), the initial charging time (Ti), Nickel cadmium or nickel hydrogen that is configured to terminate charging when it matches a reference value such as a basic voltage drop value (-ΔV), a full charge completion time (T), a maximum charge allowable time (Tmax), or a reference voltage value (V _f ). In the battery charging method,

The charging battery voltage measuring step of detecting whether the voltage of the battery mounted on the battery charger 4 is the initial charging voltage (Vi) and lower than the charging target voltage (V ₀ ),

When the voltage is detected between the initial charging voltage (Vi) and the target charging voltage (V ₀ ) from the above step, the microprocessor (5) gives an output signal to the output voltage adjusting section (2) and outputs the output switch section (3). Charging step for supplying power to the battery charging unit 4 through,

As the voltage of the charging battery increases by the above charging step, the battery voltage value measured in the on state of the output switch unit and the voltage value measured in the off state are set to the average voltage value of the battery. Battery voltage comparison step of scanning whether the full charge voltage drop value is detected by resetting the full charge completion voltage drop value (NΔV) to the ratio of the formula (-ΔV × n = NΔV) when the voltage is higher than the voltage value,

When the fully charged voltage drop value is detected from the battery voltage comparison step, the power supply is cut off by the off signal to the output switch.If the fully charged voltage drop value is not detected, the charging target voltage (V ₀ ) and the maximum charge level are charged. When the allowable voltage (Vmax) or the maximum charge allowable time (Tmax) is reached, the power supply is turned off by the OFF signal to the output switch unit, and the charging completion stage is configured to output the full charge completion signal to the visual identification unit. It consists of a charging method for small batteries.

In the present invention, the fully charged voltage drop value is set by the formula (-ΔV X n) (where n = 1 to 10). N is set in inverse proportion to the increase of the battery voltage Vb measured in the charged state of the battery to be charged. In other words, in the initial stage of charging, n is configured to reduce the value of n as the battery voltage increases in the order of 9, 8, and 7 starting with the initial value from 10.

In the present invention, such a full charge completion voltage drop value is configured differently from the basic voltage drop value (-ΔV), as shown in FIG. 5. If detected, all charging operations will be terminated and the battery will be incompletely charged. That is, during initial charging, the range of -ΔV should be as wide as possible, and when the charging is almost completed, the value of n in the formula (-ΔV X n) is set to 1 so that the basic voltage drop value and the full charge are completed. The voltage drop was made to coincide with each other to terminate charging at the same time as -ΔV was detected.

Another feature of the present invention is a basic voltage value that can be used to check whether the full charge voltage drop value is detected as well as the change of the full charge voltage drop value according to the state of charge of the battery to be charged. It is a charging method in which the voltage value Vp is actively changed and measured according to the state of charge of the battery.

More specifically, the current supplied from the rectifying unit 1 is charged to the battery mounted to the battery charging unit 4 through the output switch unit 3 by the control operation of the output voltage adjusting unit 2, the state of charge, etc. The output voltage to the naked eye display unit 7 and the sound display unit 8 while checking the voltage of the battery to be charged, and the maximum charge allowable voltage (Vmax), the charging target voltage (V ₀ ) and the initial charging based on the signal value. Matches reference values such as time (Ti), basic voltage value (Vp), basic voltage drop (-ΔV), full charge completion time (T), maximum charge allowable time (Tmax), and reference voltage (V _f ) In the nickel cadmium or nickel-metal hydride battery charging device configured to terminate the charge,

The charging battery voltage measuring step of detecting whether the voltage of the battery mounted on the battery charger 4 is the initial charging voltage (Vi) and lower than the charging target voltage (V ₀ ),

When the voltage is detected between the initial charging voltage (Vi) and the target charging voltage (V ₀ ) from the above step, the microprocessor (5) gives an output signal to the output voltage adjusting section (2) and outputs the output switch section (3). Charging step for supplying power to the battery charging unit 4 through,

As the voltage of the charging battery increases by the above charging step, the battery voltage value measured in the on state of the output switch unit and the voltage value measured in the off state are measured once every m seconds (an integer of m = 1 to 10). Interval voltage measurement step,

In the interval voltage measurement step, the battery voltage measured in the battery charger unit is measured for each given time period within the measurement time of 5 × m.If the voltage rise value is detected more than one time, the currently stored basic voltage value (Vp) is measured. ) Increases by the basic voltage drop value (-ΔV), and conversely, if the voltage increase value is not detected or the voltage value equal to the previously set basic voltage value (Vp) or the voltage drop and rise are repeated, the conventional basic voltage value Resetting the basic voltage value to maintain (Vp),

According to the above steps, as the voltage of the charging battery increases, the average voltage value of the battery is set by setting the battery average value based on the battery voltage value measured in the on state of the output switch unit and the voltage value measured in the off state. Battery voltage comparison step of scanning whether the full charge voltage drop value (NΔV) is detected by setting the basic voltage drop value (-ΔV) as a ratio of the formula (-ΔV × n = NΔV) when it is higher than the value,

When the fully charged voltage drop value is detected from the battery voltage comparison step, the power supply is cut off by the off signal to the output switch.If the fully charged voltage drop value is not detected, the charging target voltage (V ₀ ) is reached and the maximum charge level is reached. When the allowable voltage (Vmax) and the maximum charge allowable time (Tmax) are reached, the power supply is turned off by the off signal to the output switch unit, and the charging completion step of outputting a full charge completion signal to the visual identification unit is performed. It relates to a small battery charging method characterized in that.

Another feature of the present invention is the battery explosion or fire, device malfunction or damage that may occur when the charger is mounted on the vehicle according to the user's use form or when the charging operation is performed in a high temperature environment by direct sunlight or various environments In order to eliminate the problem of the initial charging, even if all the conditions have been provided, if the temperature is too high during charging is to temporarily stop or stop the operation of the charging itself.

More specifically, as shown in FIG. 6, when the charged battery voltage is measured between the charging initial voltage Vi and the charging target voltage V ₀ , the temperature detected from the signal detection line W is 45 ° C. or more. Pre-charging step of giving ON signal to the output switch part but maintaining the ratio of ON time: OFF time of the output switch part to 50 to 60%: 40 to 50% as much as the precharge time (t0),

When the temperature value detected from the signal detection line (W) during precharge within the precharge time (t0) is measured below 45 ° C, the ratio of the on time: off time of the output switch part is 80 to 90%: 20 to 10%. It is to provide a charging method for a small battery, characterized in that it further comprises a charge continuation step to continue charging to maintain.

This allows the preliminary charging of the battery by turning on the output switch part when the charging battery is heated up in various environments. Therefore, the charging operation is minimized by the charging operation, and the temperature is lowered after maintaining the precharge for a predetermined time, thereby eliminating the problems of explosion, fire, etc., which can be caused by the normal charging operation.

Another feature of the present invention is that the battery is not limited to a certain capacity, and if the charging capacity is changed, it is possible to upgrade the capacity itself.

More specifically, when the full charge voltage drop value (NΔV) is not detected in the battery mounted on the battery charging unit and charging is performed, the power is supplied as an off signal to the output switch unit as the maximum charge allowable time (Tmax) is reached. To block,

If the number of times that the power supply is cut off by reaching the maximum charge allowable time (Tmax) is detected two or more times in a row, the basic voltage drop value (-ΔV) set in the microprocessor, the full charge completion time (T), and the maximum charge It provides a charging method for a small battery, characterized in that it further comprises a reference value resetting step to reset by increasing the reference value, such as the allowable time (Tmax), the reference voltage (V _f ) by at least 20% or more.

For example, if the battery is charged with a large capacity from 1500 mA to 2500 mA, the charger currently in use will not be fully charged even after the set charging time has elapsed, but after exceeding the maximum charge allowable time (Tmax), Charging stops even when charging is not complete. If this operation is repeated two or more times in a row, the operation history is stored in the microprocessor so that the currently charged battery is considered to have a large capacity and the reference values are increased by 20 to 30%.

In another aspect of the present invention, the full charge completion voltage drop value (NΔV) is detected before reaching the full charge completion time (T) on the battery mounted to the battery charging unit, and the power supply is cut off by an off signal to the output switch unit. Steps,

If the charge completion signal for the battery is detected before reaching the full charge completion time T and the number of times that the charging operation is stopped is continuously detected mt (mt≥10) times or more, the basic voltage drop value (-ΔV) set in the microprocessor And a reference value resetting step for reducing and resetting the reference values such as a full charge completion time (T), a maximum charge allowable time (Tmax), and a reference voltage (V _f ) by at least 20% or less. It is to provide a charging method for the battery.

In this case, contrary to the explanation above, when the battery capacity is charged from large to small, and the charging operation stops in less than the reference time, the microprocessor remembers that the battery capacity is small and reduces the reference values. To make it work.

In another aspect of the present invention, the battery is charged while the charging operation is performed, so that the reference voltage value (Vf) is increased proportionally in response to the increase of the battery voltage, so that more precise charging is performed. will be.

More specifically, the current supplied from the rectifying unit 1 is charged to the battery mounted to the battery charging unit 4 through the output switch unit 3 by the control operation of the output voltage adjusting unit 2, the state of charge, etc. The output voltage to the naked eye display unit 7 and the sound display unit 8 while checking the voltage of the battery to be charged, and the maximum charge allowable voltage (Vmax), the charging target voltage (V ₀ ) and the initial charging based on the signal value. Nickel configured to terminate charging when matched with reference values such as time (Ti), basic voltage drop (-ΔV), full charge completion time (T), maximum charge allowable time (Tmax), and reference voltage (V _f ) In the cadmium or nickel hydrogen battery charging device,

The charging battery voltage measuring step of detecting whether the voltage of the battery mounted on the battery charger 4 is the initial charging voltage (Vi) and lower than the charging target voltage (V ₀ ),

When the voltage is detected between the initial charging voltage (Vi) and the target charging voltage (V ₀ ) from the above step, the microprocessor (5) gives an output signal to the output voltage adjusting section (2) and outputs the output switch section (3). Charging step for supplying power to the battery charging unit 4 through,

As the voltage of the charging battery increases by the above charging step, the battery voltage value measured in the on state of the output switch unit and the voltage value measured in the off state are measured once every m seconds (an integer of m = 1 to 10). Interval voltage measurement step,

In the above-mentioned interval voltage measurement step, the voltage of the battery mounted on the battery charging unit is measured for each given time period within the measurement time of 5 × m. (Vf) is increased by the basic voltage drop value (-ΔV), and conversely, the voltage value is not detected as being raised or the voltage value equal to the previously set reference voltage value (Vf) is measured or the voltage value is lowered and increased. Resetting the reference voltage value to maintain the conventional reference voltage value Vf if it is repeated;

According to the above steps, as the voltage of the charging battery increases, the average voltage value of the battery is set by setting the battery average value based on the battery voltage value measured in the on state of the output switch unit and the voltage value measured in the off state. Battery voltage comparison step of scanning whether the full charge voltage drop value (NΔV) is detected by setting the basic voltage drop value (-ΔV) as a ratio of the formula (-ΔV × n = NΔV) when it is higher than the value,

If the fully charged voltage drop value is detected from the battery voltage comparison step, the power supply is cut off by the off signal to the output switch.If the fully charged voltage drop value is not detected, the charging target voltage (V ₀ ) is the maximum charge level. When the allowable voltage (Vmax) and the maximum charge allowable time (Tmax) are reached, the power supply is turned off by the off signal to the output switch unit, and the charging completion step of outputting a full charge completion signal to the visual identification unit is performed. It is to provide a charging method for a small battery characterized in that.

In general, as the battery begins to charge, it must initially change the severe voltage charging curve. When such a change occurs from the high voltage to the low voltage, the generated voltage change is recognized as (-ΔV) as it is. Therefore, the charging operation for the battery can often be stopped, in which case it will not be enough to charge. In order to solve this problem, the present invention increases the currently stored reference voltage value (Vf) when a basic voltage rise value (+ ΔV) is detected at a measurement time of 5 × m. In other words, as the battery charges, the internal voltage gradually increases, so that the voltage fluctuation that can be measured can be actively responded accordingly, so that a more accurate change in the full charge voltage drop value (NΔV) can be measured. It is.

Another feature of the present invention is that the output switch is measured if the temperature detected from the signal detection line (W) is 55 ° C or more while the charged battery voltage is measured between the voltage of the initial charging voltage (Vi) and the charging target voltage (V ₀ ). The off signal is given to the unit to essentially stop the charging operation. If the charging battery exceeds 55 degrees, there is a risk of fire, and the battery itself is severely damaged. In addition, since the charger itself is damaged by various operating elements due to the high temperature, it causes serious damage, so when the temperature reaches this temperature, it stops charging at all and ensures maximum safety.

As mentioned above, the present invention is fixed to the value of -ΔV, and the full charge detection, which is dependent on it, is set at the ratio of the formula (-ΔV × n = NΔV) appropriately as the charge voltage of the battery is changed. The problem of unstable charging, such as not being fully charged and ending charging, has been significantly improved.

The present invention further provides more accurate charging by actively changing the reference voltage value Vf, which is a basic voltage value for determining whether the above-described fully charged voltage drop value is detected, according to the state of charge of the battery. It works.

In addition, the present invention does not merely detect the full charge by the temperature at the time of charging, but focuses on the safety and makes it possible to stop charging or terminate charging according to the temperature range of 45 degrees and 55 degrees. Eliminate problems such as

Claims (6)

The current supplied from the rectifying unit 1 is charged to the battery mounted on the battery charging unit 4 through the output switch unit 3 by the control operation of the output voltage adjusting unit 2, and the state of charge and the like are displayed on the naked eye. 7) While checking the voltage of the battery to be charged while outputting it to the sound display unit 8, the maximum charge allowable voltage (Vmax), the charging target voltage (V ₀ ) and the basic voltage drop value (- In the nickel cadmium or nickel metal hydride battery charging device configured to terminate the charging when it matches the reference values for determining only the battery, such as ΔV), the full charge completion time (T), the maximum charge allowable time (Tmax), Residual voltage measuring step of detecting the battery to detect whether the voltage of the battery mounted on the battery charging unit 4 is the initial charging voltage (Vi) and lower than the charging target voltage (V ₀ ), If it is detected below the initial charging voltage (Vi) or the voltage itself is not detected from the above step proceeds to the battery regeneration step, when the voltage is detected between the initial charging voltage (Vi) and the charging target voltage (V ₀ ) The charging start step of giving an output signal to the output voltage adjusting section (2) from the microprocessor (5) to supply power to the battery charging section (4) through the output switch section (3), As the voltage of the charging battery increases by the above charging start step, the battery voltage value measured in the on state of the output switch unit and the voltage value measured in the off state are set to the average voltage value of the battery. Resetting the full charge voltage drop value to reset the full charge voltage drop value (NΔV) to the ratio (-ΔV × n = NΔV) when the average voltage value is higher than the average voltage value, A battery voltage comparison step of comparing whether the reset full charge voltage drop value NΔV is detected from a charged battery to determine whether the full charge completion voltage drop value is detected; When the fully charged voltage drop value is detected from the comparison of the battery voltages described above, the power supply is cut off by the OFF signal to the output switch unit.If the fully charged voltage drop value is not detected, the charging target voltage (V ₀ ), When the maximum charge allowable voltage (Vmax) or the maximum charge allowable time (Tmax) is reached, it is composed of a charging completion stage that cuts off the power supply with the off signal to the output switch unit and outputs a full charge completion signal to the naked eye identification unit. Charging method of a small charging battery charger, characterized in that. The method of claim 1, A charging method for a small rechargeable battery charger, wherein n in the formula (−ΔV × n = NΔV) in the battery voltage comparison step is an integer from 1 to 10. The method of claim 1, When the charged battery voltage is measured between the initial charging voltage (Vi) and the charging target voltage (V ₀ ) and the temperature detected from the signal detection line (W) is 45 to 55 ° C, an on-signal is output to the output switch. Precharge stage to maintain the on time: off time ratio of the output switch unit only 50 to 60%: 40 to 50% as long as the charging time (t0), If the temperature value detected from the signal detection line (W) after the precharge time (t0) has elapsed and is measured below 45 ° C, the ratio of the on time: off time of the output switch to 80 to 90%: 20 to 10%. Charging method of a small charging battery charger, characterized in that it further comprises a charging continuing step to continue charging. The method of claim 1, When the charge is not detected on the battery mounted on the battery charging unit, the charging is progressed and the power supply is turned off with the off signal to the output switch unit as the charging progresses and the maximum charging allowable time (Tmax) is reached. When the number of times that the power supply is cut off by reaching the maximum charge allowable time Tmax is detected two or more times in succession, the reference voltage value Vf serving as the reference value of the full charge completed voltage drop value NΔV set in the microprocessor. And a reference value resetting step of resetting the reference voltage, such as a basic voltage drop value (-ΔV), a full charge completion time (T), and a maximum charge allowable time (Tmax) by increasing at least 20 to 30%. How to charge the charger for a small rechargeable battery. The method of claim 1, Before the full charge completion time (T) is reached in the battery mounted on the battery charging unit, a full charge completion voltage drop value (NΔV) is detected to cut off the power supply with an off signal to the output switch unit. When the charge completion signal for the battery is detected before reaching the full charge completion time T and the number of times that the charging operation is stopped is detected mt (mt≥10) or more consecutively, the full charge completion voltage drop value set in the microprocessor ( Resetting by reducing at least 20 to 30% of reference values such as the reference voltage value (Vf), the basic voltage drop value (-ΔV), the full charge completion time (T), and the maximum charge allowable time (Tmax), which are the reference values of NΔV). Charging method of a small charging battery charger, characterized in that it further comprises a reference value reset step. The current supplied from the rectifying unit 1 is charged to the battery mounted on the battery charging unit 4 through the output switch unit 3 by the control operation of the output voltage adjusting unit 2, and the state of charge and the like are displayed on the naked eye. 7) While checking the voltage of the battery to be charged while outputting it to the sound display unit 8, the maximum charge allowable voltage (Vmax), the charging target voltage (V ₀ ) and the basic voltage drop value (- In the nickel cadmium or nickel metal hydride battery charging device configured to terminate the charging when it matches the reference values for determining the full charge of the battery, such as ΔV), the full charge completion time (T), the maximum charge allowable time (Tmax), Residual voltage measuring step of detecting the battery to detect whether the voltage of the battery mounted on the battery charging unit 4 is the initial charging voltage (Vi) and lower than the charging target voltage (V ₀ ), When the voltage is detected between the initial charging voltage (Vi) and the target charging voltage (V ₀ ) from the above step, the microprocessor (5) gives an output signal to the output voltage adjusting section (2) and outputs the output switch section (3). Charging start step to supply power to the battery charging unit 4 through the, As the voltage of the charging battery increases by the above charging step, the battery voltage value measured in the on state of the output switch unit and the voltage value measured in the off state are measured once every m seconds (an integer of m = 1 to 10). Interval voltage measurement step, In the above-mentioned interval voltage measurement step, the voltage of the battery mounted on the battery charging unit is measured for each given time period within the measurement time of 5 × m. (Vf) is increased by the basic voltage drop value (-ΔV), and conversely, the voltage value is not detected as being raised or the voltage value equal to the previously set reference voltage value (Vf) is measured or the voltage value is lowered and increased. Resetting the reference voltage value to maintain the conventional reference voltage value Vf if it is repeated; According to the above steps, as the voltage of the charging battery increases, the average voltage value of the battery is set by setting the battery average value based on the battery voltage value measured in the on state of the output switch unit and the voltage value measured in the off state. Battery voltage comparison step of scanning whether the full charge voltage drop value (NΔV) is detected by setting the basic voltage drop value (-ΔV) as a ratio of the formula (-ΔV × n = NΔV) when it is higher than the value, When the fully charged voltage drop value is detected from the battery voltage comparison step, the power supply is cut off by the off signal to the output switch.If the fully charged voltage drop value is not detected, the charging target voltage (V ₀ ) is reached and the maximum charge level is reached. When the allowable voltage (Vmax) and the maximum charge allowable time (Tmax) are reached, the power supply is turned off by the off signal to the output switch unit, and the charging completion step of outputting a full charge completion signal to the visual identification unit is performed. Charging method of a small charging battery charger characterized in that.

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