KR101878949B1 - A battery resistance measuring method in on-load state - Google Patents

Abstract

The present invention relates to a method for measuring the battery resistance in a load connection state. The method for measuring the battery resistance in a load connection state includes the steps of: (a) generating an equivalent circuit of a circuit connecting multiple batteries with a load in parallel; (b) generating a Thevenin equivalent circuit by connecting a charger to each of the batteries in the equivalent circuit generated in the step (a) in parallel and in a sequential manner; (c) measuring the Thevenin voltage applied to each of the batteries and the current flowing on the Thevenin equivalent circuit; and (d) using the current and voltage values measured in the step (c) to measure the internal resistance of each of the batteries. According to the present invention, the method can be used to accurately measure the internal resistance of each of the batteries while the circuit including the batteries is in use, thereby enabling easy repairs and maintenance of an apparatus having the circuit mounted thereon. The method can be used to recognize the state of the batteries in advance, thereby improving the operating rate of the apparatus having the circuit mounted thereon by replacing the batteries with a short remaining service life in advance.

Description

Technical Field [0001] The present invention relates to a battery resistance measuring method,

The present invention relates to a method of measuring a battery resistance, and more particularly, to a method of measuring a battery resistance by connecting a charger in a state where a plurality of batteries are connected, And more particularly to a method of measuring a battery resistance in a load connection state in which an accurate internal resistance can be measured.

Generally, in a mobile communication base station such as a communication base station, a plurality of batteries are connected in parallel with an external DC power source. In an emergency, since the power is supplied through the battery, the output of the battery should normally operate normally.

However, in the active state in which the load is connected, there is a problem in that it is not easy to measure the internal resistance of the battery because the number of the series-connected batteries and the size of the load must be considered.

That is, in a circuit having a plurality of batteries, a resistor having a predetermined resistance value (for example, 1 ohm) is connected to a terminal of the battery in a state where no load is connected, However, in order to know the exact state of the battery when various loads are connected, it is inevitable to separate each battery from the circuit in operation and measure the internal resistance in an off-load state.

In addition, the conventional battery resistance measurement algorithm in an on-load state in which various loads are connected can only measure the relative difference of each battery of a plurality of serially connected batteries, There was a limit.

In order to overcome the problems of the prior art, the present inventors have developed a circuit which is required to supply power energy through a battery in an emergency, in which a battery is disconnected from an operating circuit while various loads are connected, The inventors of the present invention have invented a method of measuring the battery resistance in a load connected state capable of measuring internal resistance.

JP 3230048 B2

An object of the present invention is to provide a battery having a plurality of batteries, in which an equivalent circuit is created in a state where various loads are connected, a charger is connected to generate a thevenin equivalent circuit to measure a current flowing in the charger, A method of measuring a battery resistance in a load connected state for accurately grasping the state of the battery without using the battery.

According to another aspect of the present invention, there is provided a method of measuring a battery resistance in a load-connected state, the method comprising: (a) generating an equivalent circuit of a circuit in which a plurality of batteries are connected in parallel with a load; (b) sequentially connecting a plurality of chargers in parallel to each of the plurality of batteries in the generated equivalent circuit to generate a thevenin equivalent circuit; (c) measuring a current flowing through the Tehenan equivalent circuit and a Thevenin voltage applied to each of the plurality of batteries; And (d) measuring the internal resistance of each of the plurality of batteries using the measured current value and the voltage value.

In order to achieve the above object, the method of measuring a battery resistance in a load connected state of the present invention may further include measuring an internal resistivity of the charger and a terminal voltage of the plurality of batteries before the step (a) .

In order to achieve the above object, the method of measuring a battery resistance in a load-connected state of the present invention may further comprise setting an internal potential of the charger before the step (a).

In order to achieve the above object, the step (d) of the method of measuring a battery resistance in a load-connected state of the present invention includes: calculating a ratio between the plurality of the plurality of batteries; Calculating a correlation between internal resistances of the plurality of batteries using the ratio between the calculated theta voltages; And measuring internal resistance of each of the plurality of batteries by using the correlation between the calculated internal resistances.

In order to achieve the above object, the plurality of batteries of the battery resistance measuring method in a load-connected state of the present invention each include a battery internal resistance and a battery terminal voltage.

To achieve the above object, the present invention provides a method of measuring a battery resistance in a load-connected state, the load including an external power source and a load resistor.

In order to achieve the above object, the external power supply unit of the method of measuring a battery resistance in a load-connected state of the present invention includes a power supply potential and a power supply resistance.

According to another aspect of the present invention, there is provided a method of measuring a battery resistance in a load-connected state, the method comprising: (a) generating an equivalent circuit of a circuit in which a plurality of batteries are connected in parallel with a load; (b) sequentially connecting a plurality of chargers in parallel to each of the plurality of batteries in the generated equivalent circuit to generate a thevenin equivalent circuit; (c) measuring a current flowing through the Tehenan equivalent circuit and a Thevenin voltage applied to each of the plurality of batteries; And (d) measuring an internal resistance of each of the plurality of batteries using the measured current value and the voltage value, wherein the plurality of batteries are not separated from the load in an operating circuit, and the internal resistance is measured in an on-load state.

Specific details of other embodiments are included in the " Detailed Description of the Invention "and the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and / or features of the present invention and the manner of achieving them will be apparent by reference to various embodiments described in detail below with reference to the accompanying drawings.

However, the present invention is not limited to the configurations of the embodiments described below, but may be embodied in various other forms, and each embodiment disclosed in this specification is intended to be illustrative only, It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

According to the present invention, the accurate internal resistance of each battery can be measured while a circuit having a plurality of batteries is being used, so that it is possible to greatly facilitate the maintenance of equipment equipped with the circuit.

In addition, since a plurality of battery states can be grasped in advance, it is possible to improve the operating rate of equipment equipped with a circuit by replacing a battery having a short life span in advance.

FIG. 1 is a flowchart showing an operation of a method of measuring a battery resistance in a load connected state according to the present invention.
2 is a circuit diagram of a circuit to be measured according to an embodiment of the method for measuring the battery resistance shown in FIG.
3 is a circuit diagram of a circuit to which a charger is connected according to an embodiment of the method for measuring the resistance of the battery shown in Fig. 1 to the circuit diagram shown in Fig.
4 is a circuit diagram of the thevenin equivalent circuit of FIG. 3 calculated according to an embodiment of the method for measuring the resistance of the battery shown in FIG.
5 is a circuit diagram of a circuit for obtaining the Thevenin resistance (r _TH ) by applying the Thevenan theorem to the circuit shown in Fig.
6 is a circuit diagram of a circuit for obtaining the Thevenan voltage applied to the first battery internal resistance r ₁ by applying the Thevenan theorem to the circuit shown in FIG.
7 is a circuit diagram of an equivalent circuit for the circuit shown in Fig.
8 is a circuit diagram of a circuit for obtaining the Thevenan voltage applied to the second battery internal resistance r ₂ by applying the Thevenan theorem to the circuit shown in FIG.
9 is a circuit diagram of an equivalent circuit for the circuit shown in Fig.
10 is a circuit diagram of a circuit in which an ammeter is connected in series to the Thevenan equivalent circuit shown in Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Before describing the present invention in detail, terms and words used herein should not be construed as being unconditionally limited in a conventional or dictionary sense, and the inventor of the present invention should not be interpreted in the best way It is to be understood that the concepts of various terms can be properly defined and used, and further, these terms and words should be interpreted in terms of meaning and concept consistent with the technical idea of the present invention.

That is, the terms used herein are used only to describe preferred embodiments of the present invention, and are not intended to specifically limit the contents of the present invention, It should be noted that this is a defined term.

Furthermore, in this specification, the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise, and it should be understood that they may include singular do.

Where an element is referred to as "comprising" another element throughout this specification, the term " comprises " does not exclude any other element, It can mean that you can do it.

Further, when it is stated that an element is "inside or connected to" another element, the element may be directly connected to or in contact with the other element, A third component or means for fixing or connecting the component to another component may be present when the component is spaced apart from the first component by a predetermined distance, It should be noted that the description of the components or means of 3 may be omitted.

On the other hand, it should be understood that there is no third component or means when an element is described as being "directly connected" or "directly connected" to another element.

Likewise, other expressions that describe the relationship between the components, such as "between" and "immediately", or "neighboring to" and "directly adjacent to" .

In this specification, terms such as "one side", "other side", "one side", "other side", "first", "second" Is used to clearly distinguish one element from another element, and it should be understood that the meaning of the element is not limited by such term.

It is also to be understood that terms related to positions such as "top", "bottom", "left", "right" in this specification are used to indicate relative positions in the drawing, Unless an absolute position is specified for these positions, it should not be understood that these position-related terms refer to absolute positions.

Furthermore, in the specification of the present invention, the terms "part", "unit", "module", "device" and the like mean a unit capable of handling one or more functions or operations, Or software, or a combination of hardware and software.

In this specification, the same reference numerals are used for the respective components of the drawings to denote the same reference numerals even though they are shown in different drawings, that is, the same reference numerals throughout the specification The symbols indicate the same components.

In the drawings attached to the present specification, the size, position, coupling relationship, and the like of each constituent element of the present invention may be partially or exaggerated or omitted or omitted for the sake of clarity of description of the present invention or for convenience of explanation May be described, and therefore the proportion or scale may not be rigorous.

Further, in the following description of the present invention, a detailed description of a configuration that is considered to be unnecessarily blurring the gist of the present invention, for example, a known technology including the prior art may be omitted.

FIG. 1 is a flowchart showing an operation of a method of measuring a battery resistance in a load connected state according to the present invention.

FIG. 2 is a circuit diagram of a circuit to be measured according to an embodiment of the method for measuring the battery resistance shown in FIG. 1, which includes an external power supply 100, a plurality of batteries 110 and 120, and a load resistor r _L , The external power supply unit 100 includes a power supply potential E _s and a power supply resistance r _s .

In this embodiment, it is assumed that a plurality of batteries 110 and 120 are included as the first and second batteries 110 and 120 for the sake of understanding.

3 is a circuit diagram of a circuit to which a charger is connected according to an embodiment of the method for measuring the battery resistance shown in FIG. 1 in the circuit diagram shown in FIG. 2. The external power source 100, the plurality of batteries 110 and 120, (r _L ).

The external power supply unit 100 includes a power supply potential E _s and a power supply resistance r _s and the charger includes an internal potential Ec ₁ and an internal resistivity r _c .

Fig. 4 is a circuit diagram of the thevenin equivalent circuit of Fig. 3 obtained in accordance with an embodiment of the method for measuring the battery resistance shown in Fig. 1, in which a difference between a thevenin voltage V _TH , a thevenin resistance r _TH and a load resistance r _L , And the external power supply unit 100 includes a power supply potential E _s and a power supply resistance r _s .

The operation of the method of measuring the battery resistance in a load connected state according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG.

First, a plurality of batteries 110 and 120 generate an equivalent circuit for the entire circuit connected in parallel with the load (S130).

Sequentially parallel connect the charger to the equivalent each of a plurality of batteries (110, 120) included in the circuit (S140) Thevenin generate an equivalent circuit, and (S150), the current flowing through the Thevenin equivalent circuit (I _A) and a plurality of batteries (110, 120) is measured (S160).

The internal resistivity r _c of the charger and the terminal voltages of the plurality of batteries 110 and 120 are measured in advance before connecting the charger to the charger to charge the battery 110 and 120. The internal potential E _c1 of the charger is set (S120).

If a voltmeter is connected in series to the internal circuit of the battery to measure the voltage applied to the thevenin equivalent circuit, the internal resistance of the voltmeter is infinite so that the circuit is opened and no current flows through the internal resistance of the battery.

Therefore, since the voltage measured in the voltmeter is measured by the battery terminal voltage, the terminal voltage of the plurality of batteries 110 and 120 becomes equal to the equivalent voltage of each battery.

The internal resistance of each of the plurality of batteries 110 and 120 is measured using the current value and the voltage value measured in step S160 (S170).

5 is a circuit diagram of a circuit for obtaining the Thevenin resistance (r _TH ) by applying the Thevenan theorem to the circuit shown in Fig.

6 is a circuit diagram of a circuit for obtaining the Thevenan voltage applied to the first battery internal resistance r ₁ by applying the Thevenan theorem to the circuit shown in FIG.

7 is a circuit diagram of an equivalent circuit for the circuit shown in Fig.

8 is a circuit diagram of a circuit for obtaining the Thevenan voltage applied to the second battery internal resistance r ₂ by applying the Thevenan theorem to the circuit shown in FIG.

9 is a circuit diagram of an equivalent circuit for the circuit shown in Fig.

10 is a circuit diagram of a circuit in which an ammeter is connected in series to the Thevenan equivalent circuit shown in Fig.

1 to 10, a method of measuring a battery resistance in a load-connected state according to an embodiment of the present invention will be described in detail with reference to equations and circuit diagrams.

First, the battery use circuit actually used in the communication base station uses twelve batteries connected in series. However, for convenience of understanding, in the present embodiment, the first and second batteries 110 and 120, which are two batteries, .

The first battery 110 includes a first battery internal resistance r ₁ and a first battery terminal voltage E ₁ and the second battery 120 includes a second battery internal resistance r ₂ , Since the terminal voltage E ₂ is included, an equivalent circuit in which a predetermined load resistance r _L is connected is shown in FIG.

FIG. 3 shows a case in which a charger having an internal resistivity r _c and an internal potential Ec ₁ is connected in parallel with the equivalent circuit, and FIG.

That is, the Thevenin resistance (r _TH) Applying the Thevenin theorem to obtain the, voltage _{(E s, E 1, E} 2) are Thevenin resistance (r _TH), because as shown in Figure 5 all of which are a short circuit shown in Figure 4 Is calculated by the following equation (1).

Here, r ₁ denotes a first battery internal resistance, r ₂ denotes a second battery internal resistance, r _s denotes a power source resistance, and r _L denotes a load resistance.

Assuming that the power source resistance (r _s ) = 0 in Equation (1), the Thevenin resistance (r _TH ) is calculated by the following Equation (2).

Here, r ₁ Denotes a first battery internal resistance, and r ₂ denotes a second battery internal resistance.

Next, applying the Thevenan theorem to obtain the thevenin voltage V _TH shown in FIG. 4, the power source potential E _s is first turned on and the potentials E _{1 and} E ₂ are short-circuited, And the equivalent circuit is as shown in Fig. 7, so that the Thevenin voltage V _TH1 applied to the resistor r _L1 is calculated by the following equation (3).

Here, r ₁ denotes a first battery internal resistance, r ₂ denotes a second battery internal resistance, r _s denotes a power source resistance, r _L denotes a load resistance, and E _s denotes a power source potential.

Potential secondarily (E ₂₎ only turned on and the power supply potential (E _s) and the potential (E ₁₎ is as shown in Figure 8 to short-circuit, the equivalent circuit is Thevenin voltage across the resistor (r _2), so as shown in FIG (V _TH2 ) is calculated by the following equation (4).

Here, r ₁ denotes a first battery internal resistance, r ₂ denotes a second battery internal resistance, r _s denotes a power source resistance, r _L denotes a load resistance, and E ₂ denotes a second battery terminal voltage.

Similarly, the Thevenin voltage V _TH3 across the resistor r ₁ is calculated by the following equation (5).

Here, r ₁ denotes a first battery internal resistance, r ₂ denotes a second battery internal resistance, r _s denotes a power source resistance, r _L denotes a load resistance, and E ₁ denotes a first battery terminal voltage.

Thus, the Thevenin voltage (V _TH) shown in FIG. 4 Thevenin across the resistor (r _L1) Thevenin voltage (V _TH1), the resistance (r ₂₎ Thevenin voltage (V _TH2), the resistance (r ₁₎ applied to the applied to the And the voltage V _TH3 , the total voltage V _TH of the entire circuit is calculated by the following equation (6).

Here, r ₁ is a first battery internal resistance, r ₂ is a second battery internal resistance, r _s is a power source resistance, r _L is a load resistance, E _s is a power source potential, E ₁ is a first battery terminal voltage, E ₂ Quot; means the second battery terminal voltage.

If r _s = 0 is substituted into Equation (6) by neglecting the power source resistance (r _s ) in Equation (6), then the thevenin voltage (V _TH ) of the whole circuit is calculated by the following Equation (7).

Here, r ₁ denotes a first battery internal resistance _, r ₂ denotes a second battery internal resistance, E _s denotes a power source potential, E ₁ denotes a first battery terminal voltage, and E ₂ denotes a second battery terminal voltage.

A circuit with a predetermined load is connected to the internal resistivity (r _c), and when a serial connection of an ammeter a charger having a built-in potential (Ec ₁₎ to the Thevenin equivalent circuit of the parallel connection is as shown in Figure 10, the measured current (I _A ) Is calculated by the following equation (8).

Where r _TH is the Thevenan resistance, r _c is the internal resistivity of the charger, Ec ₁ is the internal potential of the charger, and V _TH is the Thevenan voltage.

In the Equation (7), the current measured when the first battery 110 is connected in parallel with the Thevenan resistance, the Thevenin voltage, and the charger is calculated by Equation (9).

Here, r ₁ is the internal resistance of the first battery _, r ₂ is the internal resistance of the second battery, r _c is the internal resistivity of the charger, Ec ₁ is the internal potential of the charger, V _TH1 is the internal voltage of the first battery 110 .

Similarly, in Equation (7), the current measured during the parallel connection of the second battery 120 to the Heavenly resistance, the voltage of the second battery, and the charger is calculated by Equation (10).

Here, r ₁ is the internal resistance of the first battery _, r ₂ is the internal resistance of the second battery, r _c is the internal resistivity of the charger, Ec ₁ is the internal potential of the charger, V _TH2 is the internal voltage of the second battery 120 .

In Equations (9) and (10), the ratio of the thevenin voltage V _TH1 of the first battery 110 to the thevenin voltage V _TH2 of the second battery 120, and the ratio of the first and second batteries 110 and 120 The correlation between internal resistances is Is calculated by the following equation (11).

Here, r ₁ denotes a first battery internal resistance _, r ₂ denotes a second battery internal resistance, V _TH1 denotes a Thevenan voltage of the first battery 110, and V _TH2 denotes a Thevenan voltage of the second battery 120.

In Equation (9), the following Equation (12) is calculated through the following inequalities.

Here, r ₁ denotes a first battery internal resistance _, V _TH1 denotes a Thevenan voltage of the first battery 110, and V _TH2 denotes a Thevenan voltage of the second battery 120.

If the formula (12) is rearranged through the following inequalities, the first battery internal resistance (r ₁ ) is calculated according to the following equation (13).

Here, I _A1 is the current measured when the charger is connected in parallel to the first battery 110, Ec ₁ is the internal potential of the charger, V _TH1 is the thevenin voltage of the first battery 110, r _c is the internal inherent And V _TH2 denotes the thevenin voltage of the second battery 120.

_The internal resistivity r _{c of the} charger is measured in advance and the internal potential Ec 1 of the charger is set in advance. The internal resistance Ec 1 of the charger is set in advance, and the thevenin voltage V _TH1 of the first battery 110, 2 Thevenin voltage (V _TH2) of the battery 120 when the only measure current (I _A1) is measured during the parallel connection of the charger, the first battery 110, it can be calculated through the equation (7) the first battery internal resistance (r ₁ ) is calculated.

Similarly, the second battery internal resistance r ₂ can be calculated by the following equation (14).

Here, I _A2 is the current measured when the charger is connected in parallel to the second battery 120, Ec ₁ is the internal potential of the charger, V _TH1 is the thevenin voltage of the first battery 110, r _c is the internal inherent value And V _TH2 denotes the thevenin voltage of the second battery 120.

Although the internal resistances r _{1 and} r ₂ of the first and second batteries 110 and 120 are calculated by connecting the charger to the first battery 110 to generate the thevenin equivalent circuit, For the twelve batteries connected in series to the circuit to be used, the internal resistance of twelve batteries can be calculated by sequentially connecting the chargers in the same manner to generate a Thevenan equivalent circuit.

As described above, according to the present invention, an equivalent circuit is generated in a circuit having a plurality of batteries connected to each other, and a charger is connected to generate a thevenin equivalent circuit to measure a current flowing in the charger. A method of measuring a battery resistance in a load connection state for accurately grasping the state of the battery without detaching the battery.

Accordingly, it is possible to measure the accurate internal resistance of each battery while a circuit having a plurality of batteries is being used, so that it is possible to greatly facilitate the maintenance of equipment equipped with the circuit.

In addition, since a plurality of battery states can be grasped in advance, it is possible to improve the operating rate of equipment equipped with a circuit by replacing a battery having a short life span in advance.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

In addition, since the present invention can be embodied in various other forms, the present invention is not limited by the above description, and the above description is intended to be a complete description of the present invention, It will be understood by those of ordinary skill in the art that the present invention is only provided to fully inform the person skilled in the art of the scope of the present invention and that the present invention is only defined by the claims of the claims.

100: External power source
110: First battery
120: Second battery
r _L : Load resistance

Claims (11)

(a) generating an equivalent circuit of a circuit in which a plurality of batteries are connected in parallel with a load;
(b) sequentially connecting a plurality of chargers in parallel to each of the plurality of batteries in the generated equivalent circuit to generate a thevenin equivalent circuit;
(c) measuring a current flowing through the Tehenan equivalent circuit and a Thevenin voltage applied to each of the plurality of batteries; And
(d) measuring the internal resistance of each of the plurality of batteries using the measured current value and the voltage value;
Lt; / RTI >
Before step (a)
Setting an internal potential of the charger;
Lt; RTI ID = 0.0 > 1, < / RTI &
Method of measuring battery resistance under load connection.
The method according to claim 1,
Before step (a)
Measuring an internal resistivity of the charger and a terminal voltage of the plurality of batteries;
Lt; RTI ID = 0.0 > 1, < / RTI &
Method of measuring battery resistance under load connection.
delete The method according to claim 1,
The step (d)
Calculating a ratio between the thevenin voltages of each of the plurality of batteries;
Calculating a correlation between internal resistances of the plurality of batteries using the ratio between the calculated theta voltages; And
Measuring an internal resistance of each of the plurality of batteries using the calculated internal resistance correlation;
≪ / RTI >
Method of measuring battery resistance under load connection.
The method according to claim 1,
Each of the plurality of batteries
A battery internal resistance, and a battery terminal voltage.
Method of measuring battery resistance under load connection.
The method according to claim 1,
The load
An external power supply, and a load resistor.
Method of measuring battery resistance under load connection.
The method according to claim 6,
The external power supply unit
A power supply potential, and a power supply resistance.
Method of measuring battery resistance under load connection.
(a) generating an equivalent circuit of a circuit in which a plurality of batteries are connected in parallel with a load;
(b) sequentially connecting a plurality of chargers in parallel to each of the plurality of batteries in the generated equivalent circuit to generate a thevenin equivalent circuit;
(c) measuring a current flowing through the Tehenan equivalent circuit and a Thevenin voltage applied to each of the plurality of batteries; And
(d) measuring the internal resistance of each of the plurality of batteries using the measured current value and the voltage value;
Lt; / RTI >
Before step (a)
Setting an internal potential of the charger;
Further comprising:
Characterized in that the internal resistance is measured in an on-load state without disconnecting the plurality of batteries from the load in an operating circuit.
Method of measuring battery resistance under load connection.
9. The method of claim 8,
Before step (a)
Measuring an internal resistivity of the charger and a terminal voltage of the plurality of batteries;
Lt; RTI ID = 0.0 > 1, < / RTI &
Method of measuring battery resistance under load connection.
delete 9. The method of claim 8,
The step (d)
Calculating a ratio between the thevenin voltages of each of the plurality of batteries;
Calculating a correlation between internal resistances of the plurality of batteries using the ratio between the calculated theta voltages; And
Measuring an internal resistance of each of the plurality of batteries using the calculated internal resistance correlation;
≪ / RTI >
Method of measuring battery resistance under load connection.

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