KR101984888B1 - Apparatus and method for estimating voltage of battery module - Google Patents
Apparatus and method for estimating voltage of battery module Download PDFInfo
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- KR101984888B1 KR101984888B1 KR1020150083503A KR20150083503A KR101984888B1 KR 101984888 B1 KR101984888 B1 KR 101984888B1 KR 1020150083503 A KR1020150083503 A KR 1020150083503A KR 20150083503 A KR20150083503 A KR 20150083503A KR 101984888 B1 KR101984888 B1 KR 101984888B1
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- battery module
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- resistor
- insulation resistance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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- G01R31/028—
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
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Abstract
The present invention discloses a battery module voltage estimating apparatus and method capable of estimating battery module voltage more accurately.
The battery module voltage estimating apparatus according to an aspect of the present invention is an apparatus for estimating a voltage of a battery module having an insulation resistance measuring instrument which is selectively connected to the battery module and measures the insulation resistance of the battery module. Distribution resistors and sensing resistors connected in series; A capacitor connected in parallel to the sensing resistor; A sensing module measuring a voltage applied to the capacitor; And detecting whether the insulation resistance meter is connected to the battery module, and when detecting that the insulation resistance meter is connected to the battery module, inputs the voltage measured by the sensing module to an error compensation function to compensate for the error compensation function. It characterized in that it comprises an estimation module for estimating the output of the voltage of the battery module.
Description
The present invention relates to a voltage estimating technique, and more particularly, to a battery module voltage estimating apparatus having an error compensation function.
Recently, as the demand for portable electronic products such as notebooks, video cameras, portable telephones, etc. is rapidly increased, and development of electric vehicles, energy storage batteries, robots, satellites, and the like is in earnest, high-performance secondary batteries capable of repeatedly charging and discharging are possible. There is an active research on.
Commercially available secondary batteries include nickel cadmium batteries, nickel hydride batteries, nickel zinc batteries, and lithium secondary batteries. Among them, lithium secondary batteries have almost no memory effect compared to nickel-based secondary batteries, and thus are free of charge and discharge. The self-discharge rate is very low and the energy density is high.
On the other hand, such a secondary battery may be used as a single secondary battery, but a plurality of secondary batteries are often used in series and / or in parallel to provide high voltage and / or large capacity power storage devices. The battery pack is used in the form of a battery pack including a battery management device that monitors a state of an internal secondary battery and controls overall charging / discharging operation.
Such a battery management device measures a battery cell voltage or a battery module voltage that is a collection of battery cells in order to monitor a state of a battery pack and perform a control operation based thereon. The battery management device measures the voltage of the battery module periodically or periodically according to a predetermined cycle.
In addition, such a battery management device measures the insulation resistance of the battery pack to determine the insulation state of the battery pack. If the battery pack is not insulated, leakage current may occur and cause various problems. Therefore, measuring insulation resistance is one of important monitoring operations of the battery management apparatus. Therefore, the battery pack includes an insulation resistance measuring instrument capable of monitoring the insulation resistance. The insulation resistance measuring instrument is electrically connected to the battery module from time to time or periodically to measure the insulation resistance of the battery pack. The battery management apparatus may check the insulation state of the battery pack through the insulation resistance measured by the insulation resistance meter.
However, when the insulation resistance meter is electrically connected to the battery module provided in the battery pack to measure the insulation resistance, the entire circuit configuration may be changed. That is, as the insulation resistance meter is connected to the battery module, a kind of load effect occurs.
On the other hand, it is common for the battery management device to periodically measure the battery module voltage and insulation resistance. In addition, the battery module voltage measurement cycle is often shorter than the insulation resistance measurement cycle, and compared with the time required to measure the battery module voltage, it takes a lot of time to measure the insulation resistance.
Therefore, when the insulation resistance meter is electrically connected to the battery module provided in the battery pack to measure the insulation resistance, the battery management device may measure the voltage of the battery module. In this case, there is a problem that an error occurs in the voltage measurement due to the change in the overall circuit configuration according to the connection of the insulation resistance meter. Furthermore, there is a problem that a circuit in which the insulation resistance meter is modeled has an error that is not found even through analysis of a circuit added to the entire circuit of the battery pack.
The Applicant has recognized that at some point in time where the voltage of the battery module is measured, an insignificant error occurs. The applicant has found that an error occurs when the voltage of the battery module is measured while the insulation resistance meter is connected while analyzing the cause of the error. The present applicant has recognized a need for a technology capable of compensating for an error in voltage of a battery module measured when an insulation resistance meter is connected.
The present invention has been made to solve the above problems, and an object of the present invention is to provide a battery module voltage estimating apparatus and method that can more accurately estimate the battery module voltage.
Another object of the present invention is to provide an apparatus and method for estimating a battery module voltage capable of compensating for an error caused by an insulation resistance meter electrically connected to a battery module.
Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. It will also be readily apparent that the objects and advantages of the invention may be realized by the means and combinations thereof indicated in the claims.
An apparatus for estimating a battery module voltage according to an aspect of the present invention for achieving the above object is an apparatus for estimating a voltage of a battery module having an insulation resistance measuring instrument selectively connected to the battery module to measure the insulation resistance of the battery module. A distribution resistor and a sensing resistor connected to the battery module in series; A capacitor connected in parallel to the sensing resistor; A sensing module measuring a voltage applied to the capacitor; And detecting whether the insulation resistance meter is connected to the battery module, and when detecting that the insulation resistance meter is connected to the battery module, inputs the voltage measured by the sensing module to an error compensation function to compensate for the error compensation function. It characterized in that it comprises an estimation module for estimating the output of the voltage of the battery module.
The estimation module may estimate the scaled voltage as the voltage of the battery module by scaling the voltage measured by the sensing module when it is detected that the insulation resistance meter is not connected to the battery module.
The scaling factor used to scale the voltage measured by the sensing module may be determined from a resistance value of the distribution resistor and a resistance value of the sensing resistor.
The estimation module may receive an insulation resistance measurement signal output by the insulation resistance meter and detect whether the insulation resistance meter is connected to the battery module.
The error compensation function may be derived from a circuit equation of an error circuit formed by the insulation resistance meter connected to the battery module.
The insulation resistance measuring device may include a first insulation resistance measuring part selectively connected to a first end of the battery module and a second insulation resistance measuring part selectively connected to a second end of the battery module. The first insulation resistance measurement unit may detect whether the first end of the battery module is connected, and whether the second insulation resistance measurement unit is connected to the second end of the battery module.
The estimation module, when the first insulation resistance measurement unit is connected to the first end of the battery module, inputs the voltage measured by the sensing module to a first error compensation function to output an output of the first error compensation function to the battery module. It can be estimated by the voltage of.
The first error compensation function may be derived from a circuit equation of a first error circuit modeling a circuit formed by the first insulation resistance measurement unit connected to the battery module.
The first error circuit may include the battery module, a first insulation resistor modeled as being connected to a first end of the battery module, a second insulation resistor modeled as being connected to a second end of the battery module, and the battery module. A first equivalent resistor modeled as an equivalent resistance by a first insulation resistance measurement unit connected to a first end of the first distribution resistor, a first distribution resistor provided on a first line connecting the first end of the battery module and the first end of the capacitor, A second distribution resistor provided on a second line connecting the second end of the battery module and the second end of the capacitor, a sensing resistor connected between the first line and the second line and connected in parallel with the capacitor; The first insulation resistance measuring unit may be a circuit including a first error resistance modeled as being connected to the second end of the capacitor due to being connected to the battery module.
The estimation module may input a voltage measured by the sensing module to an error compensation function represented by the following equation.
(V M : voltage of battery module, V C : voltage of capacitor, R 1 : resistance of first distribution resistor, R 2 : resistance of second distribution resistor, R S : resistance of sensing resistor, R L1 : resistance value of the first equivalent resistance, R I2 : resistance value of the second insulation resistance, R E1 : resistance value of the first error resistance)
The first error resistance may be calculated in advance.
The battery module voltage estimating apparatus may further include an error resistance calculation module for calculating the first error resistance.
The error resistance calculation module may include a voltage of the battery module estimated when the insulation resistance meter is not connected to the battery module, and the sensing module while the first insulation resistance measurement unit is connected to a first end of the battery module. The first error resistance may be calculated using the measured voltage.
The error resistance calculation module may calculate the first error resistance using the following equation.
(V M : voltage of battery module, V C : voltage of capacitor, R 1 : resistance of first distribution resistor, R 2 : resistance of second distribution resistor, R S : resistance of sensing resistor, R L1 : resistance value of the first equivalent resistance, R E1 : resistance value of the first error resistance)
When the second insulation resistance measurement unit is connected to the second end of the battery module, the estimation module inputs the voltage measured by the sensing module to a second error compensation function to output an output of the second error compensation function to the battery module. It can be estimated by the voltage of.
The second error compensation function may be derived from a circuit equation of a second error circuit modeling a circuit formed by the second insulation resistance measuring unit connected to the battery module.
The second error circuit may include the battery module, a first insulation resistor modeled as being connected to a first end of the battery module, a second insulation resistor modeled as being connected to a second end of the battery module, and the battery module. A second equivalent resistance modeled by a second insulation resistance measurement unit connected to a second end of the power supply unit connected in series with the second equivalent resistance, and a first line connecting the first end of the battery module and the first end of the capacitor A first divider resistor provided on the second divider resistor provided on a second line connecting the second end of the battery module and the second end of the capacitor, and connected between the first line and the second line. The circuit may include a sensing resistor connected in parallel with the capacitor and a second error resistor modeled as being connected to a second end of the capacitor because the first insulation resistance measuring unit is connected to the battery module.
The estimation module may input a voltage measured by the sensing module to an error compensation function represented by the following equation.
(V M : voltage of battery module, V C : voltage of capacitor, V 1 : voltage of power supply, R 1 : resistance of first division resistor, R 2 : resistance of second distribution resistor, R S : Resistance value of sensing resistor, R I1 : Resistance value of first insulation resistor, R L2 : Resistance value of second equivalent resistor, R E2 : Resistance value of second error resistor)
The second error resistance may be calculated in advance.
The battery module voltage estimating apparatus may further include an error resistance calculation module for calculating the second error resistance.
The error resistance calculation module may include the voltage of the battery module estimated when the insulation resistance meter is not connected to the battery module, and the sensing module while the second insulation resistance measurement unit is connected to a second end of the battery module. The second error resistance may be calculated using the measured voltage.
The error resistance calculation module may calculate the second error resistance using the following equation.
(V M : voltage of battery module, V C : voltage of capacitor, V 1 : voltage of power supply, R 1 : resistance of first division resistor, R 2 : resistance of second distribution resistor, R S : Resistance value of sensing resistor, R L2 : Resistance value of second equivalent resistor, R E2 : Resistance value of second error resistor)
A battery pack according to another aspect of the present invention for achieving the above object includes the above-described battery module voltage estimation device.
An electric vehicle according to another aspect of the present invention for achieving the above object includes the above battery module voltage estimating apparatus.
Battery module voltage estimation method according to another aspect of the present invention for achieving the above object, to estimate the voltage of the battery module having an insulation resistance measuring instrument that is selectively connected to the battery module to measure the insulation resistance of the battery module A method comprising: a sensing module for measuring a distribution resistor and a sensing resistor in series with the battery module, a capacitor connected in parallel with the sensing resistor, and a voltage applied to the capacitor; And detecting whether the insulation resistance meter is connected to the battery module, and if the insulation resistance meter is not connected to the battery module, scaling the voltage measured by the sensing module to convert the scaled voltage of the battery module. When the insulation resistance measuring device is connected to the battery module, the voltage is estimated, and the voltage measured by the sensing module is input to the error compensation function to prepare an estimation module for estimating the output of the error compensation function as the voltage of the battery module. Making; Detecting whether the insulation resistance meter is connected to the battery module; And estimating the output of the error compensation function as the voltage of the battery module by inputting the voltage measured by the sensing module to the error compensation function when it is detected that the insulation resistance meter is connected to the battery module. It features.
According to the present invention, the battery module voltage can be estimated more accurately. In particular, according to the present invention, even when the battery module voltage estimation is performed while the insulation resistance measurement is performed, the battery module voltage can be accurately estimated.
In addition to the present invention may have a variety of other effects, these other effects of the present invention can be understood by the following description, it will be more clearly understood by the embodiments of the present invention.
The following drawings attached to this specification are illustrative of the preferred embodiments of the present invention, and together with the detailed description of the invention to serve to further understand the technical spirit of the present invention, the present invention is a matter described in such drawings It should not be construed as limited to.
1 is a diagram illustrating a connection configuration in a battery pack of a battery module voltage estimating apparatus according to an embodiment of the present invention.
2 is a diagram illustrating a connection configuration in a battery pack of a battery module voltage estimating apparatus according to another embodiment of the present invention.
FIG. 3 is a diagram illustrating an equivalent circuit in a state in which the first insulation resistance measuring unit is connected to the first end of the battery module in FIG. 2.
4 is a diagram illustrating an equivalent circuit in a state in which the second insulation resistance measuring unit is connected to the second end of the battery module in FIG. 2.
5 is a diagram illustrating a first error circuit modeled to calculate a first error resistance.
6 is a diagram illustrating a second error circuit modeled to calculate a second error resistance.
7 is a flowchart illustrating a method of estimating a battery module voltage according to an embodiment of the present invention.
Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the present specification and claims should not be construed as being limited to the common or dictionary meanings, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.
Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.
Throughout the specification, when a part is said to "include" a certain component, it means that it may further include other components, without excluding the other components unless otherwise stated. In addition, the terms "...", "module", etc. described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software, or a combination of hardware and software.
In addition, throughout the specification, when a part is 'connected' to another part, it is not only 'directly connected' but also 'indirectly connected' with another element in between. Include.
In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, the same reference numerals are used throughout the drawings for parts having similar functions and functions.
1 is a diagram illustrating a connection configuration in a battery pack of a battery module voltage estimating apparatus according to an embodiment of the present invention.
Referring to FIG. 1, a battery pack according to an embodiment of the present invention includes a
The
The battery cell B may be an electric double layer capacitor including an ultra capacitor or a secondary battery such as a lithium ion battery, a lithium polymer battery, a nickel cadmium battery, a nickel hydrogen battery, a nickel zinc battery, or the like.
The insulation
Here, the insulation resistance is a resistance component expressed to indicate the insulation state of the battery pack. If the insulation state of the battery pack is maintained well, the resistance value of the insulation resistance will have a sufficiently large value, that is, a value larger than the threshold value. In contrast, when the insulation state of the battery pack is broken, the resistance value of the insulation resistance will have a value less than or equal to a threshold value. An insulation resistance representing an insulation state of the battery pack may be modeled as a first insulation resistor R I1 and a second insulation resistor R I2 . Here, the first insulation resistance R I1 is an insulation resistance indicating an insulation state of the first end of the
On the other hand, as described above, when the insulation
Referring back to FIG. 1, the battery module
The distribution resistor is a resistance component connected in series with the
The sensing resistor R S is a resistance component connected in series with the
The capacitor C is connected in parallel to the sensing resistor R S. It said capacitor (C) is connected in parallel to said sensing resistance (R S) so as to have the same voltage as the voltage applied to the sensing resistor (R S) can be filled.
The
In addition, the
The
As an example, the
As another example, the
In addition, the sensing methods listed above are merely exemplary and should not be interpreted in a limiting sense.
The
First, the
Next, the
2 is a diagram illustrating a connection configuration in a battery pack of a battery module voltage estimating apparatus according to another embodiment of the present invention.
2, a battery pack according to another embodiment of the present invention includes a
The insulation
The first insulation
The first insulation switch SW L1 may be selectively opened and closed to change an electrical connection state between the first insulation
The first insulation sensing resistor R L12 and the first insulation distribution resistor R L11 may be implemented as resistance elements, respectively. The first insulation distribution resistor R L11 functions as a voltage divider. The first insulation sensing resistor R L12 is subjected to voltage measurement. That is, the insulation controller, which will be described later, may measure the voltage applied to the first insulation sensing resistor R L12 .
The second insulation
The second insulation switch SW L2 may be selectively opened and closed to change an electrical connection state between the second insulation
The second insulation sensing resistor R L22 and the second insulation distribution resistor R L21 may be implemented as resistance elements, respectively. The second insulation distribution resistor R L21 functions as a voltage divider. The second insulation sensing resistor R L22 is subjected to voltage measurement. That is, the insulation controller, which will be described later, may measure the voltage applied to the second insulation sensing resistor R L22 .
The insulation controller may control opening and closing of the first insulation switch SW L1 and the second insulation switch SW L2 . The insulation control unit may measure a voltage applied to the first insulation sensing resistor R L12 and the second insulation sensing resistor R L22 .
An insulation resistance measuring process of the insulation
The insulation control unit turns on the first insulation switch SW L1 so that the first insulation
Subsequently, the insulation control unit turns on the second insulation switch SW L2 so that the second insulation
The insulation control unit may measure insulation resistance using the measured voltage. More specifically, the insulation control unit may include a voltage applied to the first insulation sensing resistor R L12 and a second insulation resistance measurer in a state in which the first
The battery module
The distribution resistance of the battery module
In addition, the battery module
In addition, the battery module
In addition, the battery module
On the other hand, the integrated circuit and the ground are connected to both ends of the capacitor (C), respectively. That is, an integrated circuit is connected to the first end of the capacitor C, and a ground is connected to the second end of the capacitor C. A fifth switch SW5 is provided between the first end of the capacitor C and the integrated circuit, and a sixth switch SW6 is provided between the second end of the capacitor C and the ground.
The
Hereinafter, a voltage sensing process of the battery module
First, the
Subsequently, after a predetermined time has elapsed, the
Hereinafter, a battery module voltage estimating process of the battery module
First, a process of estimating a battery module voltage when the insulation
When the
More specifically, when the
Next, a battery module voltage estimation process when the insulation
When the
Therefore, when the insulation
More specifically, the
The error compensation function may be derived from a circuit equation of a circuit in which the insulation
Here, the error compensation function derived from the circuit equation of the circuit formed by the first insulation
That is, the first error compensation function may be referred to as a function reflecting an error generated when the first insulation
Therefore, when the first insulation
Likewise, when the second insulation
First Error Compensation Function
Hereinafter, a process of deriving a first error compensation function from a circuit equation of a circuit formed by connecting the first insulation resistance measuring unit to the first end of the battery module will be described with reference to the accompanying drawings.
FIG. 3 is a diagram illustrating an equivalent circuit in a state in which the first insulation resistance measuring unit is connected to the first end of the battery module in FIG. 2. That is, FIG. 3 is a state in which the first insulation
As such, a circuit in which the insulation
Referring to FIG. 3, the first line resistor R 11 and the second line resistor R 12 of FIG. 2 are modeled as a first distribution resistor R 1 , and the third line resistor R 21 of FIG. 2. ) And the fourth line resistor R 22 are modeled as the second distribution resistor R 2 . In addition, the first insulation
That is, an error generated when the first insulation
By obtaining a circuit equation of the circuit shown in FIG. 3, arranging the voltage of the
The circuit equation of the circuit shown in FIG. 3 is summarized as follows for the voltage of the
here,
V M : voltage of battery module,
V C : voltage of the capacitor,
R 1 : resistance value of the first distribution resistor,
R 2 : resistance value of the second distribution resistor,
R S : resistance value of sensing resistance,
R L1 : resistance value of the first equivalent resistance,
R I1 : resistance value of the first insulation resistance,
R P1 : Equivalent resistance value of the first equivalent resistance and the first insulation resistance,
R I2 : resistance value of the second insulation resistance,
R E1 : Resistance value of the first error resistance.
In addition, since the first equivalent resistor R L1 and the first insulation resistor R I1 are connected in parallel, the equivalent resistance value of the first equivalent resistor R L1 and the first insulation resistor R I1 is expressed as follows. Expressed as
Preferably, the first error circuit shown in Fig. 3 can be more approximated. That is, the first insulating because first the resistance of the equivalent resistor connected in parallel to the first insulating resistance (R L1) is large enough compared to the resistance of the first equivalent resistance (R L1) resistance can be ignored. That is, the first insulation resistance can be treated as an open circuit. The circuit equation of the first error circuit by this approximation can be approximated as follows.
As such, the circuit equation of the first error circuit summarized with respect to the voltage of the
Therefore, the
2nd error compensation function
Hereinafter, a process of deriving a second error compensation function from a circuit equation of a circuit in which the second insulation
4 is a diagram illustrating an equivalent circuit in a state in which the second insulation resistance measuring unit is connected to the second end of the battery module in FIG. 2. That is, FIG. 4 is a state in which the second insulation
Referring to FIG. 4, the first line resistor R 11 and the second line resistor R 12 of FIG. 2 are modeled as a first distribution resistor R 1 , and the third line resistor R 21 of FIG. 2. ) And the fourth line resistor R 22 are modeled as the second distribution resistor R 2 . In addition, the second insulation
An error generated when the second insulation
By obtaining a circuit equation of the circuit shown in FIG. 4, arranging the voltage of the
The circuit equation of the circuit shown in FIG. 4 is summarized as follows for the voltage of the
here,
V M : voltage of battery module,
V C : voltage of the capacitor,
V 1 : voltage of the power supply unit,
R 1 : resistance value of the first distribution resistor,
R 2 : resistance value of the second distribution resistor,
R S : resistance value of sensing resistance,
R I1 : resistance value of the first insulation resistance,
R I2 : resistance value of the second insulation resistance,
R L2 : resistance value of the second equivalent resistance,
R E2 : Resistance value of the second error resistance.
Equation 4 may be derived by applying Kirchhoff's law to the second error circuit shown in FIG. 4, and thus description of detailed equations for deriving Equation 4 will be omitted.
As such, the circuit equation of the second error circuit summarized with respect to the voltage of the
Therefore, the
Calculation of Error Resistance
As described above, the resistance values of the first error resistance R E1 and the second error resistance R E2 may be calculated in advance through experiment or simulation. According to an embodiment, the resistance values of the first error resistance R E1 and the second error resistance R E2 may be calculated beforehand when the battery pack is initially set.
Hereinafter, an embodiment of calculating resistance values of the first error resistance R E1 and the second error resistance R E2 will be described.
According to an embodiment, the
First, a process of calculating the first error resistance R E1 will be described.
The first error resistance R E1 may be calculated from the first error circuit formed by connecting the first insulation
As described above, the error
Preferably, in order to approximate the circuit equation, the first error circuit may be modeled as follows.
5 is a diagram illustrating a first error circuit modeled to calculate a first error resistance.
Comparing FIG. 5 with FIG. 3, there is a difference in that the insulation resistance is ignored. In general, since the resistance value of the insulation resistance has a very large value, even if the insulation resistance is ignored and the first error resistance R E1 is calculated, there is no significant difference. In particular, when the insulation resistance is ignored, the first error circuit is relatively simply modeled, and thus, the circuit equation of the first error circuit may be relatively simply expressed as in
here,
V M : voltage of battery module,
V C : voltage of the capacitor,
R 1 : resistance value of the first distribution resistor,
R 2 : resistance value of the second distribution resistor,
R S : resistance value of sensing resistance,
R L1 : resistance value of the first equivalent resistance,
R E1 : Resistance value of the first error resistance.
In a similar manner, the error
6 is a diagram illustrating a second error circuit modeled to calculate a second error resistance.
Comparing FIG. 6 with FIG. 4, there is a difference in that the insulation resistance is ignored. Since the insulation resistance is neglected, the second error circuit is modeled relatively simply, so that the circuit equation of the second error circuit can be expressed relatively simply. Therefore, the equation (Equation 7) for calculating the second error resistance R E2 can be expressed relatively simply as follows.
here,
V M : voltage of battery module,
V C : voltage of the capacitor,
V 1 : voltage of the power supply unit,
R 1 : resistance value of the first distribution resistor,
R 2 : resistance value of the second distribution resistor,
R S : resistance value of sensing resistance,
R L2 : resistance value of the second equivalent resistance,
R E2 : Resistance value of the second error resistance.
The error
According to another aspect of the present invention, the above-described battery module
The battery module
Hereinafter, a battery module voltage estimation method according to another aspect of the present invention will be described. For the method of estimating the battery module voltage according to another aspect of the present invention, since the description of the above-described battery module
In addition, the subject of each step of performing the battery module voltage estimating method according to another aspect of the present invention may be each component of the above-described battery module
7 is a flowchart illustrating a method of estimating a battery module voltage according to an embodiment of the present invention.
Battery module voltage estimation method according to an embodiment of the present invention, the
Subsequently, the method detects whether the
Next, when the
On the other hand, the first error compensation function and the second error compensation function each include a first error resistance R E1 and a second error resistance R E2 reflecting an error. Here, the first error resistance R E1 and the second error resistance R E2 may be calculated in advance. That is, the first error resistance R E1 and the second error resistance R E2 may be calculated before the
If the
Although the present invention has been described above by means of limited embodiments and drawings, the present invention is not limited thereto and will be described below by the person skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of the claims.
The features described in the individual embodiments herein can be implemented in combination in a single embodiment. Conversely, various features described in a single embodiment herein can be implemented in various embodiments individually or in appropriate subcombination.
B: battery cell
100: battery module voltage estimation device
200: insulation resistance measuring instrument
300: battery module
210: first insulation resistance measuring unit
220: second insulation resistance measuring unit
R I1 : First Insulation Resistance
R I2 : Second Insulation Resistance
R 1 : first divider resistor
R 2 : second distribution resistor
R S : sensing resistance
C: capacitor
110: sensing module
120: estimation module
130: switch control module
140: error resistance calculation module
Claims (20)
A distribution resistor and a sensing resistor connected in series with the battery module;
A capacitor connected in parallel to the sensing resistor;
A sensing module measuring a voltage applied to the capacitor; And
Receiving an insulation resistance measurement signal output by the insulation resistance meter, and including an estimation module for detecting whether the insulation resistance meter is connected to the battery module when the sensing module measures the voltage applied to the capacitor,
The estimation module,
When it is detected that the insulation resistance meter is connected to the battery module when the sensing module measures the voltage applied to the capacitor, the sensing module is measured by the load effect as the insulation resistance meter is connected to the battery module. The battery module voltage estimating apparatus for estimating the output of the error compensation function as the voltage of the battery module by inputting the voltage measured by the sensing module to the error compensation function so that the error occurred in the voltage.
The estimation module, when it is detected that the insulation resistance meter is not connected to the battery module, by scaling the voltage measured by the sensing module to estimate the scaled voltage as the voltage of the battery module, characterized in that Module voltage estimation device.
And a scaling factor used to scale the voltage measured by the sensing module is determined from a resistance value of the distribution resistor and a resistance value of the sensing resistor.
And the error compensation function is derived from a circuit equation of an error circuit formed by the insulation resistance measuring instrument connected to the battery module.
The insulation resistance measuring device may include a first insulation resistance measuring part selectively connected to a first end of the battery module and a second insulation resistance measuring part selectively connected to a second end of the battery module.
The estimation module detects whether the first insulation resistance measurement unit is connected to a first end of the battery module and whether the second insulation resistance measurement unit is connected to a second end of the battery module. Estimation device.
The estimation module, when the first insulation resistance measurement unit is connected to the first end of the battery module, inputs the voltage measured by the sensing module to a first error compensation function to output an output of the first error compensation function to the battery module. Battery module voltage estimation device, characterized in that for estimating the voltage.
And the first error compensation function is derived from a circuit equation of a first error circuit modeling a circuit formed by the first insulation resistance measurement unit connected to the battery module.
The first error circuit may include the battery module, a first insulation resistor modeled as being connected to a first end of the battery module, a second insulation resistor modeled as being connected to a second end of the battery module, and the battery module. A first equivalent resistor modeled as an equivalent resistance by a first insulation resistance measurement unit connected to a first end of the first distribution resistor, a first distribution resistor provided on a first line connecting the first end of the battery module and the first end of the capacitor, A second distribution resistor provided on a second line connecting the second end of the battery module and the second end of the capacitor, a sensing resistor connected between the first line and the second line and connected in parallel with the capacitor; Battery module voltage estimation, characterized in that the circuit including a first error resistance modeled as being connected to the second end of the capacitor because the first insulation resistance measuring unit is connected to the battery module Device.
And the estimating module inputs the voltage measured by the sensing module to the first error compensation function represented by the following equation.
(V M : voltage estimated by the voltage of the battery module, V C : the voltage measured by the sensing module, R 1 : resistance value of the first distribution resistor, R 2 : resistance value of the second distribution resistor, R S : resistance value of sensing resistor, R L1 : resistance value of first equivalent resistor, R I2 : resistance value of second insulation resistor, R E1 : resistance value of first error resistor)
The battery module voltage estimation device, characterized in that the first error resistance is calculated in advance.
The battery module voltage estimating apparatus further includes an error resistance calculating module for calculating the first error resistance.
The error resistance calculation module may include a voltage of the battery module estimated when the insulation resistance meter is not connected to the battery module, and the sensing module while the first insulation resistance measurement unit is connected to a first end of the battery module. The battery module voltage estimation device, characterized in that to calculate the first error resistance using the measured voltage.
The error resistance calculation module, the battery module voltage estimation device, characterized in that for calculating the first error resistance using the following equation.
(V M : voltage estimated by the voltage of the battery module, V C : the voltage measured by the sensing module, R 1 : resistance value of the first distribution resistor, R 2 : resistance value of the second distribution resistor, R S : resistance value of sensing resistor, R L1 : resistance value of first equivalent resistor, R E1 : resistance value of first error resistor)
When the second insulation resistance measurement unit is connected to the second end of the battery module, the estimation module inputs the voltage measured by the sensing module to a second error compensation function to output an output of the second error compensation function to the battery module. Battery module voltage estimation device, characterized in that for estimating the voltage.
And the second error compensation function is derived from a circuit equation of a second error circuit modeling a circuit formed by the second insulation resistance measuring unit connected to the battery module.
The second error circuit may include the battery module, a first insulation resistor modeled as being connected to a first end of the battery module, a second insulation resistor modeled as being connected to a second end of the battery module, and the battery module. A second equivalent resistance modeled by a second insulation resistance measurement unit connected to a second end of the power supply unit connected in series with the second equivalent resistance, and a first line connecting the first end of the battery module and the first end of the capacitor A first divider resistor provided on the second divider resistor provided on a second line connecting the second end of the battery module and the second end of the capacitor, and connected between the first line and the second line. A circuit including a sensing resistor connected in parallel with the capacitor and a second error resistor modeled as being connected to a second end of the capacitor because the first insulation resistance measuring unit is connected to the battery module. The battery module voltage estimator as set.
A sensing module measuring a distribution resistor and a sensing resistor connected in series with the battery module, a capacitor connected in parallel with the sensing resistor, and a voltage applied to the capacitor; And detecting whether the insulation resistance meter is connected to the battery module, and if the insulation resistance meter is not connected to the battery module, scaling the voltage measured by the sensing module to convert the scaled voltage of the battery module. When the insulation resistance measuring device is connected to the battery module, the voltage is estimated, and the voltage measured by the sensing module is input to the error compensation function to prepare an estimation module for estimating the output of the error compensation function as the voltage of the battery module. Making;
Receiving an insulation resistance measurement signal output by the insulation resistance meter, and detecting whether the insulation resistance meter is connected to the battery module when the sensing module measures the voltage applied to the capacitor; And
When it is detected that the insulation resistance meter is connected to the battery module when the sensing module measures the voltage applied to the capacitor, the sensing module is measured by the load effect as the insulation resistance meter is connected to the battery module. Estimating the output of the error compensation function as the voltage of the battery module by inputting the voltage measured by the sensing module to an error compensation function so that an error generated in the voltage is compensated for;
Battery module voltage estimation method comprising a.
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