KR102260606B1 - Method and apparatus for decision of battery polarity in automatic battery charger - Google Patents

Abstract

The present invention relates to a method and apparatus for determining the polarity of a rechargeable battery in an automatic battery charger, and more particularly, to determine the polarity of a rechargeable battery inserted into an automatic battery charger by a user regardless of the polarity, and the determined polarity for charging accordingly.

Description

Method and apparatus for determining the polarity of a rechargeable battery in an automatic battery charger {METHOD AND APPARATUS FOR DECISION OF BATTERY POLARITY IN AUTOMATIC BATTERY CHARGER}

The present invention relates to a method and apparatus for determining the polarity of a rechargeable battery in an automatic battery charger, and more particularly, to determine the polarity of a rechargeable battery inserted into an automatic battery charger by a user regardless of the polarity, and the determined polarity for charging accordingly.

Rechargeable batteries are advantageous to the environment by reducing waste in that they can be used repeatedly with one battery, and are economical by reducing the purchase cost of batteries, so it is desirable to encourage as many people as possible to use them. However, since the user has to recognize the type, size, and polarity of the rechargeable battery one by one, it may be difficult for people with low cognitive ability, such as children or the elderly, to use it. It is cumbersome and inconvenient to do.

In order to solve this inconvenience, it will be very useful if the charger automatically determines the polarity and charges the battery when the battery is inserted into the charger regardless of the polarity of the battery.

It is relatively easy to determine the polarity when a voltage is detected in the rechargeable battery when the rechargeable battery is in contact with the electrode of the charger. However, if the detected voltage is very low or close to 0V, it is difficult to determine the polarity. When the voltage of the battery is very low or reaches 0V, it is easy to judge that the battery has reached the end of its lifespan, but in many cases, when one battery is connected in series, if one battery is weak, reverse charging occurs. If you take it out and measure the voltage, a reverse voltage is detected, the voltage is close to 0V, or in some cases almost 0V. Even in this case, if you find the polarity of the battery correctly and charge it, you can continue to use it even if there is some loss of charge capacity.

The present invention is to solve the above problems in view of this point, in a charger that automatically determines the battery polarity and charges the battery, to present a circuit and a method for determining the polarity efficiently within a range that does not put a strain on the battery do..

As an existing prior art document related to such technical content, Korean Patent Registration No. 1734197 (2017.05.02.), filed and registered by the present applicant, relates to an automatic battery charging device and a method therefor. It relates to an automatic battery charging apparatus and method, characterized in that charging is performed regardless of polarity while transporting, and automatically classifying and storing the battery by determining whether the battery is defective or abnormal.

The prior literature suggests that charging can be performed regardless of the polarity by automatically sensing the polarity of the battery so that the user does not need to arrange the batteries so that the polarity of the battery is the same, but in the present invention, the polarity is automatically When various types of batteries are inserted in the charger, the polarity of the batteries is accurately determined and charging starts for rechargeable batteries, and batteries that are judged to be no longer usable are additional to the polarity determination of batteries that are judged as bad batteries. We present a circuit and method that can determine a bad battery. The prior literature does not provide a battery polarity determination and a bad battery determination circuit and method through this of the present invention.

In addition, Korean Patent Application Laid-Open No. 10-2010-0057580 (2010.05.31.) forms an insert charging part of an AA/AAA-type secondary battery, and contacts the +,- terminals of a hexahedral stick-type secondary battery in the central part. a battery charger body in which a variable sliding charging terminal is embedded; a slide opening/closing plate for stably and closely fixing AA/AAA-type and hexahedral stick-type secondary batteries of different shapes and lengths by using a compression spring on the upper part of the battery charger body; Detects the polarity of the contact state of the + and - terminals of the stick-type secondary battery in contact with the sliding variable charging terminal of the battery charger body, regardless of the polarity of the +,- terminals of the detected hexahedral stick-type secondary battery It converts the output polarity of the variable sliding charging terminal to match the + and - terminals of the hexahedral stick-type secondary battery, and at the same time converts it to the appropriate charging voltage required by the stick-type secondary battery and has a wide range of outputs. It relates to a non-polar multi-charger consisting of one circuit part.

The prior document detects the polarity of the contact state of the + and - terminals of the stick-type secondary battery in contact with the sliding variable charging terminal of the battery charger body, and the +, - terminals of the detected hexahedral stick-type secondary battery. Regardless of the polarity, it converts the output polarity of the variable sliding charging terminal to match the + and - terminals of the hexahedral stick-type secondary battery, and at the same time converts it to the appropriate charging voltage required by the stick-type secondary battery and outputs a wide range However, in the present invention, when various types of batteries are inserted in an automatic charger regardless of polarity, the polarity of the battery is accurately determined to start charging in the case of a rechargeable battery. In addition, a circuit and method for determining a bad battery are provided in addition to determining the polarity of a battery that is judged to be difficult to use anymore. The prior literature does not provide a battery polarity determination and a bad battery determination circuit and method through this of the present invention.

Accordingly, the present invention, as mentioned above, in the present invention, when various types of rechargeable batteries are put in the automatic charger regardless of polarity, the polarity of the rechargeable battery is properly determined and the rechargeable battery starts charging, A battery determined to be difficult to use is presented with a battery polarity determination and a defective battery determination circuit and method for determining a defective battery.

In the automatic battery charger according to the present invention, the nickel-metal hydride battery is quite stable even in reverse charge or full discharge, and in many cases, it can be used again after charging. If the nickel-metal hydride battery is maintained in a reverse-charged state and the battery is disconnected and the voltage is measured, the voltage may be detected as reverse polarity. In addition, if the battery is disconnected and the voltage is measured while maintaining the fully discharged state, the voltage may come out close to 0V. When recharging the battery, it is important to accurately determine the polarity of the battery and start charging, because if the reverse charging is continued due to the wrong determination of the battery polarity, the battery performance is greatly deteriorated. Accordingly, it is an object of the automatic battery charger according to the present invention to provide a method and circuit for accurately determining the polarity of a battery.

For reference, the charger includes a rechargeable battery with a nominal voltage of around 1.2V, such as nickel cadmium and nickel-hydrogen, a rechargeable battery with a nominal voltage of around 3.6V of lithium ion or lithium polymer systems, and a nominal voltage of around 1.5V. A manganese battery or an alkaline dry battery may be used. Hereinafter, they will be referred to as nickel-metal hydride batteries, lithium-ion batteries, and dry batteries. There are many other types of batteries, but most of the cylindrical batteries used in households are the above types.

In addition, in the automatic battery charger according to the present invention, since it is essential to use a lithium-ion battery with a built-in charge and discharge protection element inside, when the voltage is measured while being used in a reverse charge or full discharge state, the internal protection circuit operates to protect the battery. Since it is separated from the outside, the voltage is measured near 0V. Therefore, it is reasonable to assume that the reverse polarity is not detected. In addition, there is a risk of explosion during charging and discharging of a lithium-ion battery without a built-in protection element, and it is prohibited to sell alone to the general public. Therefore, a lithium-ion battery without a built-in protection element does not need to be considered.

A dry battery is very vulnerable to reverse charging or full discharging, so if the voltage is measured after reverse charging, the reverse voltage is detected, and in the fully discharged state, a voltage of 0V or close to it is detected. Since a dry battery is basically a non-rechargeable battery, it is preferable not to use the battery in the above state as a bad battery and not use it additionally. Otherwise, battery deformation or leakage may occur.

Therefore, in the present invention, when the same type of battery is inserted in the automatic charger regardless of polarity, the polarity of the battery is accurately determined and the rechargeable battery starts charging, and the battery determined to be difficult to use anymore is judged as a bad battery The purpose of the present invention is to present a circuit and method for determining the polarity of a battery and determining a bad battery.

In order to achieve this object, the apparatus for determining the polarity of a rechargeable battery according to an embodiment of the present invention includes a voltage source, a polarity determination circuit, a voltage measurement unit, and a polarity determination processor, wherein the polarity determination circuit is from the voltage source further comprising a charging switch for forming a circuit to charge the rechargeable battery and a discharging switch for forming a circuit for discharging from the rechargeable battery, to configure a forward or reverse path between the voltage source and the rechargeable battery It is characterized in that it includes a plurality of forward and reverse charge-discharge switches for.

In addition, in the polarity determination circuit, the forward and reverse charge/discharge switches include a set of switches for connecting the voltage source and the rechargeable battery in a forward direction in the path of the circuit formed by the voltage source, the resistor, and the rechargeable battery, and the voltage source and a set of switches that allow the rechargeable battery to be connected in the reverse direction.

wherein the polarity determination circuit further includes a switch that connects the voltage source, the resistor, and the rechargeable battery in series, and disconnects or connects the voltage source and the resistor, and the resistor and the rechargeable battery characterized in that The polarity determination processor, in the polarity determination circuit consisting of a resistor for controlling the current charged from the voltage source to the rechargeable battery, and a switch for changing the charging direction, first measures the voltage and then performs charging and discharging with a constant current to obtain a difference in the measured voltage, then change the charging direction, obtain a difference in the same measured voltage, and compare the magnitudes of the two voltages to determine the polarity of the rechargeable battery.

On the other hand, in the method for determining the polarity of a rechargeable battery according to another embodiment of the present invention, in an apparatus for determining the polarity of a rechargeable battery, the voltage is measured by repeatedly charging and discharging the rechargeable battery in a forward direction, and the rechargeable battery A voltage measurement step of repeating charging and discharging in the reverse direction to measure the voltage a predetermined number of times, in the polarity determining device of the rechargeable battery, calculating the average charging/discharging voltage for calculating the average charging/discharging voltage for the forward and reverse directions, respectively Step, in the polarity determination device of the rechargeable battery, a voltage drop calculation step of calculating a voltage drop from the calculated charge/discharge voltage for the forward and reverse directions, and in the polarity determination device of the rechargeable battery, the forward and reverse directions and comparing the calculated voltage drop to a polarity determination step of determining the polarity of the rechargeable battery.

Here, the voltage measuring step includes charging the rechargeable battery for a predetermined charging time, disconnecting the voltage source and measuring the voltage of the rechargeable battery with a voltmeter, and charging the rechargeable battery for a predetermined discharge time smaller than the charging time. It characterized in that it comprises performing a process including the step of discharging the battery, and the step of disconnecting the path of the discharging circuit and measuring the voltage of the rechargeable battery a predetermined number of times.

The present invention relates to a method and apparatus for determining the polarity of a rechargeable battery in an automatic battery charger, and to determine the polarity of a rechargeable battery inserted into an automatic battery charger by a user regardless of the polarity, and to charge according to the determined polarity. It has the advantage of providing convenience.

In addition, by determining the polarity of the rechargeable battery according to the present invention, there is an effect that can determine whether the rechargeable battery is defective as a side effect thereof.

1 is a block diagram of an apparatus for determining the polarity of a rechargeable battery in an automatic battery charger according to an embodiment of the present invention.
2 is a circuit diagram of a polarity determination circuit of a rechargeable battery in an automatic battery charger according to an embodiment of the present invention.
3 is a flowchart illustrating a method for determining the polarity of a rechargeable battery in an automatic battery charger according to an embodiment of the present invention.
4 is a flowchart illustrating forward and reverse charging/discharging procedures of a rechargeable battery in an automatic battery charger according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail by describing preferred embodiments of the present invention with reference to the accompanying drawings. Like reference numerals in each figure indicate like elements. In addition, specific structural or functional descriptions for the embodiments of the present invention are only exemplified for the purpose of describing the embodiments according to the present invention, and unless otherwise defined, all terms used herein, including technical or scientific terms They have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention pertains. Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present specification. does not

1 is a block diagram of an apparatus for determining the polarity of a rechargeable battery in an automatic battery charger according to an embodiment of the present invention.

As shown in Figure 1, the polarity determination device 100 of the rechargeable battery of the present invention is a polarity determination processor 110, a voltage source 120, a polarity determination circuit 130, a rechargeable battery 140 and a voltage measuring unit (150) is included.

Here, the polarity determination processor 110 is implemented by executing a program for performing a polarity determination function with a microprocessor. The polarity determination processor 110 mounts the rechargeable battery 140 , and then drives the polarity determination circuit 130 to measure the voltage with the voltage measurement unit 150 , and determines the polarity as a result.

The voltage source 120 serves to supply power to the polarity determination circuit 130 . The power is supplied or discharged as needed from the polarity determination circuit 130 .

The polarity determination circuit 130 includes a switch for selectively receiving the power and a resistor used as an intermediate element to flow a current from the power source to the rechargeable battery, and the voltage source 120 is connected to the rechargeable battery 140 ) is configured including switches for connecting in the forward or reverse direction.

The voltage measuring unit 150 is configured as a voltmeter, and measures the voltage whenever the voltage source 120 is connected or only the rechargeable battery 140 is connected.

The measured voltage is stored and recorded in a memory (not shown) through the microprocessor 110 . It is possible to determine the polarity of the rechargeable battery 140 by analyzing the recorded measured voltage.

Hereinafter, the polarity determination circuit 130 proposed in the present invention will be described.

2 is a circuit diagram of a polarity determination circuit of a rechargeable battery in an automatic battery charger according to an embodiment of the present invention.

As shown in Figure 2, the polarity determination circuit of the rechargeable battery is a voltage source (V) that can vary the voltage, a resistor (R) for controlling the flow of current, switches (S3, S4, S5) that determine the direction in which the current flows , S6), a voltage meter (part) for measuring the voltage of the battery, and a switch (S2) for configuring a circuit for discharging current from the battery.

The apparatus for determining the polarity of a rechargeable battery according to the present invention includes a voltage source, a polarity determination circuit, a voltage measurement unit, and a polarity determination processor. wherein the polarity determination circuit further includes a charging switch for forming a circuit to charge the rechargeable battery from the voltage source and a discharging switch for forming a circuit for discharging from the rechargeable battery, the voltage source and the charging and a plurality of forward and reverse charge/discharge switches for establishing a forward or reverse path between the batteries.

In the polarity determination circuit, the forward and reverse charge/discharge switches include a set of switches for connecting the voltage source and the rechargeable battery in a forward direction in a circuit path formed by the voltage source, the resistor, and the rechargeable battery, and the voltage source and and a set of switches that allow the rechargeable battery to be connected in the reverse direction.

The polarity determination circuit includes a switch that connects the voltage source, the resistor, and the rechargeable battery in series, and disconnects or connects the voltage source and the resistor, and the resistor and the rechargeable battery.

In addition, the polarity determination processor, in the polarity determination circuit consisting of a switch for changing the charging direction and a resistor controlling the current charged from the voltage source to the rechargeable battery, first measures the voltage and then charges and discharges with a constant current to obtain a difference in the measured voltages, then change the charging direction and obtain a difference in the same measured voltages, and compare the magnitudes of the two voltages to determine the polarity of the rechargeable battery.

The voltage source V is provided to apply an appropriate voltage as a charging voltage according to the type of battery. For example, a voltage source of about 2V is appropriate for nickel-metal hydride batteries and batteries with nominal voltages of 1.2V and 1.6V, and 4.2V is suitable for lithium-ion batteries. The voltage source (V) is connected in series with a switch (S1) capable of applying or disconnecting a voltage. After the switch S1, a switch S2, which is responsible for the discharge function, is connected to the ground of the circuit to perform the discharge function. Switch S1 and switch S2 must not be closed at the same time. The resistor (R) performs a function of regulating the current. For example, if the voltage source is 2V and the initial voltage of the rechargeable battery is 1V, and the resistance (R) is 100 ohms, a current of 10mA flows into the battery. When the batteries are connected in reverse, the voltage difference is 3V, so a current of 30mA flows. Switches S3 to S6 are cross switches that determine the direction of current. When switch S3 and switch S6 are connected and switch S4 and switch S5 are disconnected, the voltage source V in the forward direction of the battery B shown in FIG. connected through R). Conversely, when the switch S4 and the switch S5 are connected, and the switch S3 and the switch S6 are disconnected, the voltage source is connected with the opposite polarity of the battery (B). Rechargeable battery (B) is the battery whose polarity is to be determined and is usually connected via a battery holder. The voltage measuring unit is a means for constantly measuring the voltage of the rechargeable battery.

Here, the voltage source V, the switches S1 to S6, and the voltmeter can be implemented as semiconductors using a microprocessor and FET devices, and the polarity of the rechargeable battery and the presence or absence of a defect can also be determined by the microprocessor 110. have.

First, after repeating charging and discharging in the forward direction in the circuit, measure the voltage and record it. After connecting the rechargeable battery to determine the polarity, first connect the switches S1, S3, and S6 to charge the rechargeable battery for a certain period of time. For example, in the case of an AA-type NiMH battery, it is safe to charge a current of 10mA to 100mA within 10 seconds. After a certain time has elapsed, the switch S1 is disconnected and the voltage is measured (V1). After measuring the voltage, the discharge process is performed by connecting the switch S2. The discharge time is set to be smaller than the charging time, but it is recommended to set it to about half. When the discharge time elapses, disconnect S2 and measure the voltage (V2).

After the forward voltage measurement is completed, the reverse direction charge/discharge is repeated to measure the voltage. By connecting switches S1, S4, and S5 and disconnecting switches S2, S3, and S6, a reverse charging circuit is formed. The reverse charge time is the same as the forward charge time, and the voltage measurement (VR1) and discharge and voltage measurement (VR2) methods are the same.

When the backward measurement is completed, the forward measurement is performed again. And repeat this process 2 more times. In reality, there is a limit to the measurement time, so 10 to 20 times will be appropriate. Then, the average charge/discharge voltage is obtained by adding up all of the measured forward charging and discharging voltages V1 and V2 and the reverse charging and discharging voltages VR1 and VR2 and dividing by the number of repeated charging. When these are AV1, AV2, AVR1, and AVR2, the voltage difference dV = AV1 - AV2, dVR = AVR1 - AVR2 is obtained. If the battery is forward connected and the correct polarity is connected, the dV doesn't make much difference. Conversely, if the forward connection is connected in the reverse direction to the actual battery polarity, it is charged and then discharged in the non-chargeable direction, so the voltage drop occurs a lot and dV increases. The polarity of the battery is determined using the difference in the magnitude of the difference voltage.

Hereinafter, the method for determining the polarity of the rechargeable battery discussed above will be described through the flowchart.

3 is a flowchart illustrating a method for determining the polarity of a rechargeable battery in an automatic battery charger according to an embodiment of the present invention.

As shown in FIG. 3 , the method for determining the polarity of the rechargeable battery in the automatic battery charger according to the present invention measures the voltage through the voltage measurement unit 150 by repeating forward charge and discharge first, and the polarity determination processor 110 . in the memory (not shown) (S110). Next, the voltage is measured and recorded by repeating reverse charge/discharge by controlling the switch of the polarity determination circuit 130 of FIG. 2 ( S120 ). Recording the voltage by repeating the forward and reverse charging and discharging is repeated a predetermined number of times (S130).

Forward and reverse charge/discharge is performed a predetermined number of times, and an average charge/discharge voltage is first obtained through the result (S140). In addition, the charging/discharging voltage drop is measured using the average charging/discharging voltage (S150). The polarity of the rechargeable battery is determined based on the measured voltage drop (S160).

Therefore, in the method for determining the polarity of a rechargeable battery according to the present invention, in the apparatus for determining the polarity of the rechargeable battery, the voltage is measured by repeatedly charging and discharging the rechargeable battery in the forward direction, and repeating the charging and discharging of the rechargeable battery in the reverse direction A voltage measuring step of performing a predetermined number of times to measure the voltage, an average charge/discharge voltage calculation step of calculating an average charge/discharge voltage for the forward and reverse directions in the polarity determination device of the rechargeable battery, respectively, of the rechargeable battery In the polarity determination device, a voltage drop calculation step of calculating a voltage drop from the calculated charge/discharge voltage for the forward and reverse directions, and in the polarity determination device of the rechargeable battery, the calculated voltage drop for the forward and reverse directions and a polarity determination step of determining the polarity of the rechargeable battery by comparing them.

Hereinafter, the forward and reverse charge and discharge procedures (S110, S120) of the rechargeable battery according to the present invention will be described.

4 is a flowchart illustrating forward and reverse charging/discharging procedures of a rechargeable battery in an automatic battery charger according to an embodiment of the present invention.

As shown in FIG. 4 , in the forward and reverse charge/discharge procedures, first, the switches S1, S3, and S6 are connected to charge the rechargeable battery for a predetermined time (S210). Then, disconnect the voltage source and measure the voltage of the rechargeable battery with a voltmeter (S220). Continue to discharge the rechargeable battery for a predetermined time smaller than the charging time (S230). Then, the discharge path is cut and the voltage of the rechargeable battery is measured (S240). The above process is performed up to a predetermined number of times (S250). These results are stored in the memory through the microprocessor 110 .

That is, the voltage measuring step according to the present invention includes the steps of charging the rechargeable battery for a predetermined charging time, disconnecting the voltage source and measuring the voltage of the rechargeable battery with a voltmeter, a constant smaller than the charging time discharging the rechargeable battery during a discharging time, and disconnecting a path of the discharging circuit and measuring a voltage of the rechargeable battery.

After performing the voltage measurement process according to the forward charging and discharging described above, then the switches S1, S4, and S5 are connected, and the switches S2, S3, and S6 are cut to form a reverse charging circuit, and then the voltage is measured through the process of FIG. .

Using the result of the measured voltage, the measured forward charging and discharging voltages V1 and V2 and the reverse charging and discharging voltages VR1 and VR2 are all added up and divided by the number of repeated charging to obtain an average charging/discharging voltage. When these are AV1, AV2, AVR1, and AVR2, the voltage difference dV = AV1 - AV2, dVR = AVR1 - AVR2 is obtained. If the battery is forward connected and the correct polarity is connected, the dV doesn't make much difference. Conversely, if the forward connection is connected in the reverse direction to the actual battery polarity, it is charged and then discharged in the non-chargeable direction, so the voltage drop occurs a lot and dV increases. The polarity of the battery is determined using the difference in the magnitude of the difference voltage.

As a result of determining that the voltage drop occurs, when it is determined that neither the forward direction nor the reverse direction occurs, determining that the rechargeable battery has failed.

As described above, the present invention relates to a method and an apparatus for determining the polarity of a rechargeable battery in an automatic battery charger, and the user determines the polarity of the rechargeable battery inserted into the automatic battery charger regardless of the polarity, There is an advantage of providing the convenience of charging according to the polarity.

In addition, by determining the polarity of the rechargeable battery according to the present invention, there is an effect that can determine whether the rechargeable battery is defective as a side effect thereof.

As described above, the present invention has been described with reference to the embodiment shown in the drawings, but this is merely exemplary, and various modifications and equivalent other embodiments are possible therefrom by those of ordinary skill in the art. will understand the point. Therefore, the technical protection scope of the present invention should be determined by the following claims.

100: polarity determination device 110: polarity determination processor
120: voltage source 130: polarity determination circuit
140: rechargeable battery 150: voltage measuring unit

Claims (6)

voltage source 120;
a polarity determination circuit 130 receiving power from the voltage source 120 for a predetermined time to charge or discharge the rechargeable battery 140 for a predetermined time;
a voltage measuring unit 150 for measuring the voltage in a state in which the voltage source 120 and the rechargeable battery 140 are connected or only the rechargeable battery 140 is connected; and
When the rechargeable battery 140 is mounted, the driving of the polarity discrimination circuit 130 is controlled, and the charging is performed through the voltage measured by the voltage measuring unit 150 according to the driving of the polarity discrimination circuit 130 . Includes; polarity determination processor 110 for determining the polarity of the battery 140;
The polarity determination circuit 130 includes a charging switch (S1) for forming a circuit to charge the rechargeable battery 140 from the voltage source 120; a discharge switch (S2) for forming a circuit to discharge the rechargeable battery 140; a plurality of forward charge/discharge switches (S3, S6) for forming a forward path between the voltage source (120) and the rechargeable battery (140); and a plurality of reverse charge/discharge switches (S4, S5) for configuring a reverse path between the voltage source 120 and the rechargeable battery 140;
The polarity determination processor 110 controls the driving of the switch for charging (S1), the switch for discharging (S2) and a plurality of switches for forward charging and discharging (S3, S6) when forming a forward path, and a reverse path When formed, the charging switch (S1), the switch for discharging (S2), and a plurality of reverse charging and discharging switches (S4, S5) for controlling the driving of the rechargeable battery polarity determination device. The method according to claim 1,
The forward charge/discharge switch (S3, S6) is,
In the path of the circuit formed by the voltage source 120, the resistor R, and the rechargeable battery 140, the voltage source 120 and the rechargeable battery 140 are connected in a forward direction,
The reverse charge/discharge switch (S4, S5) is,
Charging, characterized in that the voltage source 120 and the rechargeable battery 140 are connected in the reverse direction in the path of the circuit formed by the voltage source 120 , the resistor R, and the rechargeable battery 140 . Battery polarity determination device. delete The method according to claim 1,
The polarity determination processor 110,
The charging voltage (V1) and the discharging voltage (V2) measured by repeating forward charging and discharging of the rechargeable battery 140 for a predetermined number of times are added up and divided by the predetermined number of times to obtain an average charging voltage (AV1) and a discharging voltage ( AV2),
The charging voltage VR1 and the discharging voltage VR2 measured by repeating the reverse charging and discharging of the rechargeable battery 140 for a predetermined number of times are added up and divided by the predetermined number of times to obtain an average charging voltage (AVR1) and a discharging voltage ( AVR2) is obtained,
Calculate the forward voltage difference (dV = AV1-AV2) and the reverse voltage difference (dVR = AVR1-AVR2) from the average charging voltages (AV1, AV2) and the average discharge voltages (AVR1, AVR2) in the forward and reverse directions,
The polarity determination apparatus of a rechargeable battery, characterized in that the polarity of the rechargeable battery 140 is determined by comparing the obtained forward voltage difference (dV) and the reverse voltage difference (dVR). In the device for determining the polarity of the rechargeable battery, the rechargeable battery 140 is repeatedly charged and discharged in the forward direction to measure the voltages (V1, V2), and the rechargeable battery 140 is repeatedly charged and discharged in the reverse direction to measure the voltage ( a voltage measuring step of measuring VR1 and VR2) a predetermined number of times;
an average charge/discharge voltage calculation step of calculating average charge/discharge voltages (AV1, AV2, AVR1, AVR2) for the forward and reverse directions, respectively, in the apparatus for determining the polarity of the rechargeable battery;
In the device for determining the polarity of the rechargeable battery, the voltage drop (dV=AV1-AV2, dVR=AVR1-AVR2) is calculated from the calculated average charge/discharge voltages (AV1, AV2, AVR1, AVR2) for the forward and reverse directions. a voltage drop calculation step; and
In the polarity determination apparatus of the rechargeable battery, a polarity determination step of determining the polarity of the rechargeable battery 140 by comparing the calculated voltage drops (dV, dVR) for the forward and reverse directions; A method for determining the polarity of a rechargeable battery. 6. The method of claim 5,
The voltage measurement step is
charging the rechargeable battery 140 for a predetermined charging time;
disconnecting the voltage source 120 and measuring the voltage of the rechargeable battery 140 with a voltage measuring unit 150;
discharging the rechargeable battery 140 for a predetermined discharging time smaller than the charging time; and
Disconnecting the path of the discharging circuit and measuring the voltage of the rechargeable battery 140; and repeating the process including a predetermined number of times.

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