KR101522475B1 - Method and apparatus for charging battery - Google Patents

Abstract

A method and apparatus for charging battery is disclosed. A method for charging battery may comprise: determining whether BMS (battery management system) battery measurement DC voltage or PCS (power conversion system) battery measurement DC voltage is greater than the reference voltage; determining BMS battery measurement DC voltage or PCS battery measurement DC voltage satisfies integrity of the battery; determining whether an error between BMS battery measurement DC voltage and PCS battery measurement DC voltage is smaller than the limit value of PCS voltage error in case of integrity of battery is satisfied; determining whether BMS battery measurement DC voltage does not exist and PCS battery measurement DC voltage exists in case that the error is smaller than the limit value of PCS voltage error; determining whether PCS battery measurement DC voltage is greater than BMS battery warning overvoltage or PCS battery warning overvoltage in case that BMS battery measurement DC voltage does not exist and PCS battery measurement DC voltage exists; and executing a constant voltage control in case that PCS battery measurement DC voltage is greater than BMS battery warning overvoltage or PCS battery warning overvoltage.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

The present invention relates to a rechargeable battery, and more particularly, to a method and apparatus for recharging a battery.

Since electric vehicles are clean energy vehicles with high energy efficiency, they have been actively developed since 2003, when a certain percentage of low-pollution vehicle sales have become mandatory in the United States, starting with California, USA. In addition, some automobile companies have commercialized electric vehicles and hybrid electric vehicles.

Because electric vehicles are supplied with energy from batteries, they are directly affected by battery performance. Therefore, an electronic management device for improving the running performance of an electric vehicle, preventing overcharging of the battery, and extending battery life is a key component of an electric vehicle.

In the electric vehicle system, the electronic management device detects and controls the voltage, temperature, and charge / discharge current of the battery and optimizes the battery by estimating the state of charge (SoC) according to the operation state of the electric vehicle.

The electronic management device monitors the battery voltage, current, and temperature to calculate the state of charge (SoC) of the battery during operation or charging. As a function of the electronic management apparatus, the charging state for the battery can be calculated during operation or during charging. In this way, it is possible to prevent the excessive output of the battery by controlling the power that can be operated under the low charge state, and to protect the battery by avoiding excessive charge in the overcharge state. Further, the electronic management apparatus can recognize the state of unbalanced charging among the modules through the voltage deviation between the modules. It is possible to charge the battery so that each battery is uniformly charged by checking the unbalanced charging state. In addition, the electronic management apparatus can monitor the state of each battery module during operation or charging to prevent the battery from exceeding allowable voltage and temperature limits. Because the total voltage of the battery is more than 300V (volt), you can use a relay to read each voltage for it.

Korean Patent Publication No. 2012-0047100 (published on May 11, 2012)

A first object of the present invention is to provide a battery charging method.

A second object of the present invention is to provide an apparatus for performing a battery charging method.

According to an aspect of the present invention, there is provided a method of charging a battery, the method comprising the steps of: determining whether a BMS (battery management system) battery measurement DC voltage or a PCS Determining whether the BMS battery measurement DC voltage or the PCS battery measurement DC voltage is greater than the reference voltage to determine whether the battery satisfies the health of the battery, Determining whether an error between the BMS battery measurement DC voltage and the PCS battery measurement DC voltage is less than a limit of the PCS voltage error; if the error is less than the limit of the PCS voltage error, Determining whether the PCS battery measurement DC voltage is present and not present, the BMS battery side Determining whether the PCS battery measurement DC voltage is greater than the BMS battery warning overvoltage and the PCS battery warning overvoltage if the DC voltage is not present and the PCS battery measurement DC voltage is present; And performing the constant voltage control when the BMS battery warning overvoltage and the PCS battery warning overvoltage are greater than the BMS battery warning overvoltage and the PCS battery warning overvoltage. Wherein the constant voltage control is performed based on a control voltage, the control voltage is a value obtained by adding an error compensation component to the reference voltage, and the error compensation component includes a voltage deviation value, a voltage error tolerance value, And the voltage deviation value may be a difference value of the BMS battery measurement DC voltage at the reference voltage. The error compensation amount may be determined to be 0 when the voltage deviation value is smaller than the voltage error tolerance value. Wherein the error compensation unit determines whether the voltage deviation value is smaller than the micro variation interval value when the voltage deviation value is not smaller than the voltage error tolerance, And the value of the voltage deviation is divided by N (where N is a natural number). Wherein the error compensation unit determines whether the voltage deviation value is smaller than the micro deviation interval value when the voltage deviation value is not smaller than the voltage error tolerance value and if the voltage deviation value is not smaller than the micro variation interval value And may be determined as the voltage deviation value. The method of charging a battery includes performing a battery protection operation when the battery is not in good condition and when an error between the BMS battery measurement DC voltage and the PCS battery measurement DC voltage is greater than a limit of the PCS voltage error, And performing a battery protection operation. The method of charging a battery includes performing a constant current control when the BMS battery measurement DC voltage or a PCS battery measurement DC voltage is not greater than a reference voltage and determining that the PCS battery measurement DC voltage is lower than the BMS battery warning overvoltage and the PCS battery warning overvoltage And performing the constant current control when the voltage difference is not greater than the reference voltage.

In order to achieve the second object of the present invention, there is provided a charging apparatus for a battery according to an aspect of the present invention, the charging apparatus including a battery management system (BMS) Determining whether or not the DC voltage of the PCS battery measurement is greater than the reference voltage and, if the BMS battery measurement DC voltage or the PCS battery measurement DC voltage is greater than the reference voltage, And determines whether or not an error between the BMS battery measurement DC voltage and the PCS battery measurement DC voltage is less than a limit of the PCS voltage error when the battery health is satisfied, If the BMS battery measurement DC voltage is not present and the PCS battery measurement DC voltage is less than the threshold And determining whether the PCS battery measurement DC voltage is greater than the BMS battery warning overvoltage and the PCS battery warning overvoltage when the BMS battery measurement DC voltage is not present and the PCS battery measurement DC voltage is present And to perform the constant voltage control when the PCS battery measurement DC voltage is higher than the BMS battery warning overvoltage and the PCS battery warning overvoltage. Wherein the constant voltage control is performed based on a control voltage, the control voltage is a value obtained by adding an error compensation component to the reference voltage, and the error compensation component includes a voltage deviation value, a voltage error tolerance value, And the voltage deviation value may be a difference value of the BMS battery measurement DC voltage at the reference voltage. The error compensation amount may be determined to be 0 when the voltage deviation value is smaller than the voltage error tolerance value. Wherein the error compensation unit determines whether the voltage deviation value is smaller than the micro variation interval value when the voltage deviation value is not smaller than the voltage error tolerance, And the value of the voltage deviation is divided by N (where N is a natural number). Wherein the error compensation unit determines whether the voltage deviation value is smaller than the micro deviation interval value when the voltage deviation value is not smaller than the voltage error tolerance value and if the voltage deviation value is not smaller than the micro variation interval value And may be determined as the voltage deviation value. Wherein the processor performs a battery protection operation if the battery is not healthy and if the error between the BMS battery measurement DC voltage and the PCS battery measurement DC voltage is greater than the limit of the PCS voltage error, As shown in FIG. Wherein the processor performs constant current control when the BMS battery measurement DC voltage or the PCS battery measurement DC voltage is not greater than the reference voltage and the PCS battery measurement DC voltage is greater than the BMS battery alert overvoltage and the PCS battery alert overvoltage It can be implemented to perform the constant current control.

As described above, when using the battery charging method and apparatus according to the embodiment of the present invention, it is possible to improve the profitability of an energy storage system (ESS) of a customer through a stable charging and discharging operation of a PCS (power conversion system). In addition, if an error occurs in the battery due to quick fault diagnosis, the safety procedure for the battery can be prevented by preventing the accident.

1 is a conceptual diagram illustrating an energy storage system (ESS) according to an embodiment of the present invention.
2 is a flowchart illustrating a charging algorithm according to an embodiment of the present invention.
3 is a flowchart illustrating a constant voltage control method according to an embodiment of the present invention.
4 is a conceptual diagram illustrating a power conversion apparatus according to an embodiment of the present invention.
5 is a conceptual diagram illustrating a battery charging apparatus according to an embodiment of the present invention.
6 is a conceptual diagram showing a battery charging apparatus according to an embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Hereinafter, the same reference numerals will be used for the same constituent elements in the drawings, and redundant explanations for the same constituent elements will be omitted.

1 is a conceptual diagram illustrating an energy storage system (ESS) according to an embodiment of the present invention.

1, the ESS may be implemented as a PCS (Power Conversion System) 100 connected in parallel, a battery management system (BMS) 120 connected to the PCS 100, and a battery 140.

The PCS 100 may be implemented to provide power to a load using a commercial power source. In addition, energy can be stored (charged) in a lithium-polymer (lithium-ion) battery storage device through a bidirectional power converter when power generation and generation power generated from generators such as solar power or wind power generation is large at the same time. The real-time output distribution calculation of the PCS 100 connected in parallel can be performed by a specific PCS such as the master PCS 100. [

The battery module may be a concept that includes the BMS 120 and the battery 140. The battery module can be constructed using, for example, a lithium-polymer (lithium-ion) battery having high efficiency, long life, instant charging and discharge characteristics. The instant charging and discharging characteristics of the lithium-polymer battery can be improved and the capacity of the battery can be increased, so that the energy storage system can be remarkably developed.

The BMS 120 may be included in the battery module. The BMS 120 can acquire basic data for checking the state of the battery 140 and control the operation of the battery. In order to secure the safety of the battery 140, it is possible to sense the voltage, current, and temperature of the battery 140, and to transmit information related to the battery to the host device through communication. These functions are the information necessary to operate the energy storage device safely. In the PCS 100 as a host device, the battery module can be protected from abnormality through a circuit that protects the over-voltage, over-current, over-temperature, and the like by checking the driving state and the malfunction state of the battery based on such information.

As a problem of the existing charging algorithm, the battery voltage measured by the PCS may be affected by the voltage sensor, sensing resistor, sensing circuit, analog / digital converter, average value calculation method (cycle) . An error may be larger when the corresponding component for sensing the battery voltage is made low-cost.

For example, a battery can calculate SoC through the voltage / current measured through the BMS. At this time, when the constant voltage control of PCS is controlled to be higher or lower than the reference voltage (BMS measurement voltage reference) by an error between the voltage measured by the BMS and the voltage measured by the PCS, the battery may be overcharged or uncharged .

According to an embodiment of the present invention, an algorithm for compensating a charging voltage after confirming an error range and a soundness of a BMS measurement voltage and a PCS measurement voltage in charge of a battery consisting of constant current control and constant voltage control will be described.

2 is a flowchart illustrating a charging algorithm according to an embodiment of the present invention.

The charging algorithm according to the embodiment of the present invention can be performed based on the constant current control and the constant voltage control.

In Fig. 2, a constant current control algorithm is described.

The constant current control can first determine whether the BMS battery measurement DC voltage calculated by performing the battery measurement in the BMS and the PCS battery measurement DC voltage calculated by performing battery measurement in the PCS is greater than the reference voltage (step S200).

The reference voltage may be a magnitude of a predetermined voltage for determining whether or not constant current control is continuously performed. In the charging algorithm according to the embodiment of the present invention, when the battery measurement DC voltage measured by the PCS and the battery measurement DC voltage measured by the BMS are compared with the reference voltage, if the magnitude of one of the two measured voltages is larger than the reference voltage, It is possible to judge whether to perform the constant voltage control through the additional judgment.

Conversely, if both the BMS battery measurement DC voltage and the PCS battery measurement DC voltage are both lower than the reference voltage, the constant current control operation can be continuously performed in the rechargeable battery.

It is determined whether the battery is healthy (step S210).

BMS battery measurement DC voltage and PCS battery measurement If the DC voltage is greater than the reference voltage, battery health can be judged. The health of the battery can be judged based on various parameters. For example, the battery health may include information on whether the state of charge (SoC) is higher than a reference percentage, information on the maximum and minimum values of the temperature of the battery, information on the charging current value, and information on the maximum or minimum value of the cell voltage It can be judged based on various factors. As a result of the determination in step S210, if the integrity of the battery is not satisfied, the charger protection procedure can be performed by the protection procedure. Conversely, if it is determined in step S210 that the battery integrity is satisfied, it can be determined whether there is an error between the magnitude of the BMS battery measurement DC voltage and the magnitude of the PCS battery measurement DC voltage.

It is determined whether the error between the BMS battery measurement DC voltage and the PCS battery measurement DC voltage is less than the limit of the PCS voltage error (step S220).

It can be determined whether the error between the BMS battery measurement DC voltage and the PCS battery measurement DC voltage is less than the limit of the PCS voltage error. If the error between the BMS battery measurement DC voltage and the PCS battery measurement DC voltage is less than the limit of the PCS voltage error, the protection procedure can be performed by a protection procedure. For example, the rechargeable battery protection circuit can be operated to control the state of the rechargeable battery to be in a safe state.

Conversely, if the error between the BMS battery measurement DC voltage and the PCS battery measurement DC voltage is greater than or equal to the limit of the PCS voltage error, then the following determination procedure may be performed to determine whether to perform constant voltage control.

It is determined whether the BMS battery measurement DC voltage is not present and the PCS battery measurement DC voltage is present (step S230).

It is determined whether the BMS battery measurement DC voltage is not present and the PCS battery measurement DC voltage is present.

If the BMS battery measurement DC voltage is not present and the PCS battery measurement DC voltage is present, a determination can be made as to whether the PCS battery measurement voltage is greater than or equal to the battery warning overvoltage of the BMS and the battery warning overvoltage of the PCS. Conversely, if the BMS battery measurement DC voltage is present or the PCS battery measurement DC voltage is not present, the constant voltage control can be performed immediately.

It is determined whether the PCS battery measuring voltage is equal to or greater than the battery warning overvoltage of the BMS and the battery warning overvoltage of the PCS (step S240).

If the PCS battery measured voltage is equal to or greater than the battery warning overvoltage of the BMS and the battery warning overvoltage of the PCS, constant voltage control may be performed (step S250). Conversely, if the PCS battery measurement voltage is less than the BMS's battery warning overvoltage and PCS's battery warning overvoltage, then constant current control can be performed.

Hereinafter, a constant voltage control method will be described in the embodiment of the present invention.

3 is a flowchart illustrating a constant voltage control method according to an embodiment of the present invention.

3 shows a method for determining a control voltage for constant voltage control.

Referring to FIG. 3, a voltage deviation that is a value obtained by subtracting the BMS battery measurement DC voltage from the reference voltage is calculated (step S300).

In the constant voltage control method, the voltage deviation can be used to calculate the error compensation amount for determining the control voltage by comparing the voltage error tolerance of the PCS and the micro-fluctuation interval value of the PCS.

It is determined whether or not the voltage deviation is smaller than the voltage error tolerance of the PCS (step S310).

It is possible to determine whether the voltage deviation is smaller than the voltage error tolerance of the PCS to determine the error compensation amount. If the voltage deviation is smaller than the voltage error tolerance of the PCS, the error compensation amount can be determined to be zero (step S320).

When the voltage deviation is greater than or equal to the voltage error tolerance of the PCS, the error compensation can be determined by comparing the voltage deviation and the micro-fluctuation interval value of the PCS.

It is determined whether or not it is smaller than the voltage deviation and the micro-variation interval value of the PCS (step S330).

It is possible to determine the error compensation amount by judging whether the voltage deviation is smaller than the micro variation interval value of the PCS.

If the voltage deviation is smaller than the micro-fluctuation interval value of the PCS, the error compensation amount can be determined as {K} / N (where N = 4, 3, 2, 1). N may be different depending on the setting. That is, a smaller value than the voltage deviation K may be selected as the error compensation (step S340).

로 결정될 수 있다(단계 S350).When the voltage deviation is greater than or equal to the value of the micro-fluctuation interval of the PCS, the error compensation component is {K}, the low pass filter [{K}

(Step S350).

The control voltage may be a value obtained by adding the calculated error compensation to the reference voltage. The calculated control voltage is renewed to the reference voltage and can be used for constant current control and constant voltage control.

2 and 3, when constant voltage control is performed for battery protection in an upper region (about 80%) of the residual capacity of the battery in the battery charging consisting of the constant current control and the constant voltage control, It is possible to compensate for overcharging or non-charging of the battery caused by an error in the control voltage.

4 is a conceptual diagram illustrating a power conversion apparatus according to an embodiment of the present invention.

Referring to FIG. 4, the power conversion apparatus may include a power converter control unit 400 and an upper control unit 450. The configurations of the power converter control unit 400 and the upper control unit 450 shown in FIG. 4 are exemplified by classifying each constituent unit into functions. Accordingly, one constituent part may be embodied as a plurality of constituent parts, or a plurality of constituent parts may be embodied as one constituent part.

The power converter control unit 400 may include a constant current control unit 405, an improved mode switching unit 410, a constant voltage control unit 415, and a first constant voltage control error compensating unit 420.

The constant current control unit 405 may be implemented to perform the constant current control operation of the charger. When it is determined that the constant current control operation is performed by the mode switching unit 410, the constant current control unit 405 can perform the constant current control operation.

The mode switching unit 410 may be implemented to switch whether to perform the constant current control operation or the constant voltage control operation. According to the embodiment of the present invention, the mode switching unit 410 can determine whether to perform the constant current control operation or the constant voltage control operation based on various determination procedures. For example, a determination is made as to whether the BMS battery measurement DC voltage and the PCS battery measurement DC voltage are greater than the reference voltage, whether the battery is sound or not, the error between the BMS battery measurement DC voltage and the PCS battery measurement DC voltage is less than the PCS voltage Determining whether the BMS battery measurement DC voltage is 0 and the PCS battery measurement DC voltage is 1; determining whether the PCS battery measurement DC voltage is less than the battery warning overvoltage of the BMS or the battery warning overvoltage of the PCS; It is possible to judge whether to perform the constant current control operation or the constant voltage control operation through various judgments such as judgment as to whether it is large or not.

The constant voltage control unit 415 may perform a constant voltage control operation when it is determined that the constant voltage performing operation is performed by the mode control unit 410. [

The first constant voltage control error compensating unit 420 may perform error compensation to set the control voltage in performing the constant voltage control.

The upper control unit 450 may include a second constant voltage control error compensator 460.

The second constant voltage control error compensating unit 460 may perform error compensation to set the control voltage in performing the constant voltage control.

The compensated error value can be used to continuously control the charging of the battery.

5 is a conceptual diagram illustrating a battery charging apparatus according to an embodiment of the present invention.

FIG. 5 shows a constant voltage control determining device for determining whether to perform constant voltage control in an energy storage system (ESS).

The constant voltage control determination apparatus includes a battery measuring DC voltage unit 500, a battery integrity determination unit 510, a voltage error limit determination unit 520, a measured voltage determination unit 530, a battery warning overvoltage determination unit 540, 550). Each constituent unit of the constant voltage control apparatus is exemplarily divided into constituent units for each function for convenience of explanation so that one constituent unit is embodied as a plurality of constituent units or a plurality of constituent units are constituted as one constituent unit .

The battery measurement DC voltage unit 500 is implemented to determine whether the BMS battery measurement DC voltage calculated by performing the battery measurement in the BMS and the PCS battery measurement DC voltage calculated by performing the battery measurement in the PCS is greater than the reference voltage . In the battery charging algorithm according to the embodiment of the present invention, when the battery measurement DC voltage measured by the PCS and the battery measurement DC voltage measured by the BMS are compared with the reference voltage, if the magnitude of one of the two measurement voltages is larger than the reference voltage , It is possible to judge whether to perform the constant voltage control through the additional judgment. Conversely, if both the BMS battery measurement DC voltage and the PCS battery measurement DC voltage are both lower than the reference voltage, it can be implemented to continuously perform the constant current control operation when the battery is charged.

The battery health determiner 510 may be implemented to determine whether the battery is healthy. The battery health determiner 510 may be configured to operate when the BMS battery measurement DC voltage and the PCS battery measurement DC voltage are greater than the reference voltage as a result of the determination by the battery measurement DC voltage unit 500. [ The health of the battery can be judged based on various parameters. For example, the battery health may include information on whether the state of charge (SoC) is higher than a reference percentage, information on the maximum and minimum values of the temperature of the battery, information on the charging current value, and information on the maximum or minimum value of the cell voltage It can be judged based on various factors.

The voltage error limit determination unit 520 may be configured to determine whether an error between the BMS battery measurement DC voltage and the PCS battery measurement DC voltage is less than a limit of the PCS voltage error. The voltage error limit determination unit 520 may be configured to perform the rechargeable battery protection procedure by a protection procedure when the error between the BMS battery measurement DC voltage and the PCS battery measurement DC voltage is smaller than the limit of the PCS voltage error. For example, the rechargeable battery protection circuit can be operated to control the state of the rechargeable battery to be in a safe state. On the contrary, if the error between the BMS battery measurement DC voltage and the PCS battery measurement DC voltage is greater than or equal to the limit value of the PCS voltage error as a result of the determination, the voltage error limit determination unit 520 performs the following determination procedure to perform the constant voltage control It is possible to judge whether or not it is.

The measurement voltage determination unit 530 may be configured to determine whether the BMS battery measurement DC voltage is not present and whether the PCS battery measurement DC voltage is present. If the BMS battery measurement DC voltage is not present and the PCS battery measurement DC voltage is present, a determination can be made as to whether the PCS battery measurement voltage is greater than or equal to the battery warning overvoltage of the BMS and the battery warning overvoltage of the PCS. Conversely, if the BMS battery measurement DC voltage is present or the PCS battery measurement DC voltage is not present, the constant voltage control can be performed immediately. The constant voltage control procedure can be performed based on the control voltage determined by the control voltage determination unit, which will be described later, when the constant voltage control is performed.

The battery warning overvoltage determination unit 540 can determine whether the PCS battery measurement voltage is greater than or equal to the battery warning overvoltage of the BMS and the battery warning voltage of the PCS. And to perform constant voltage control when the PCS battery measurement voltage is equal to or greater than the battery warning overvoltage of the BMS and the battery warning overvoltage of the PCS. The constant voltage control procedure can be performed based on the control voltage determined by the control voltage determination unit, which will be described later, when the constant voltage control is performed. Conversely, if the PCS battery measurement voltage is less than the BMS's battery warning overvoltage and PCS's battery warning overvoltage, the battery charge can be performed again by performing constant current control.

The processor 550 controls the operations of the battery measuring DC voltage unit 500, the battery health determiner 510, the voltage error limit determiner 520, the measured voltage determiner 530, and the battery warning overvoltage determiner 540 And the like.

6 is a conceptual diagram showing a battery charging apparatus according to an embodiment of the present invention.

FIG. 6 shows a control voltage determining apparatus for calculating a control voltage for performing constant voltage control in an energy storage system (ESS).

6 includes a voltage deviation calculation unit 600, a voltage error tolerance value determination unit 610, a micro fluctuation interval value determination unit 620, an error compensation unit 630, a control voltage determination unit 640 ), And a processor 650. Each of the components of the control voltage determining device is illustratively divided into the functions for determining the control voltage for each function, so that one component may be implemented as a plurality of components or a plurality of components may be implemented as one component.

The voltage deviation calculating section 600 may be implemented to calculate a voltage deviation that is a value obtained by subtracting the BMS battery measurement DC voltage from the reference voltage. The voltage deviation calculated by the voltage deviation calculator 600 may be used to calculate an error compensation amount for determining the control voltage by comparing the voltage error tolerance of the PCS and the micro-fluctuation interval value of the PCS.

The voltage error tolerance determining unit 610 may be implemented to determine whether the voltage deviation is smaller than the voltage error tolerance of the PCS.

The error compensating unit 640 can determine whether the voltage deviation is smaller than the voltage error tolerance of the PCS to determine the error compensation amount. When the voltage deviation is smaller than the voltage error tolerance of PCS, the error compensation amount can be determined as zero.

If the voltage deviation is greater than or equal to the voltage error tolerance of the PCS, the micro-fluctuation interval value determiner 620 can be implemented to determine the error compensation amount by comparing the voltage deviation and the PCS micro-fluctuation interval value. The micro-fluctuation interval value determiner 620 can determine whether the voltage deviation is smaller than the micro-fluctuation interval value of the PCS and determine the error compensation amount.

로 결정될 수 있다.In the error compensator 630, when the voltage deviation is smaller than the micro-fluctuation interval value of the PCS, the error compensation amount can be determined as {K} / N (where N = 4, 3, 2, 1, natural number). N may be different depending on the setting. That is, a smaller value than the voltage deviation K may be selected as the error compensation amount. When the error compensator 640 is equal to or greater than the voltage deviation and the micro-fluctuation interval value of the PCS, the error compensation components are {K}, the low pass filter [{K}

. ≪ / RTI >

The control voltage determiner 640 can determine the control voltage by adding the error compensator calculated by the error compensator 630 and the reference voltage. Based on the determined control voltage, the reference voltage can be updated again and used for constant current control and constant voltage control.

The processor 650 controls the operations of the voltage deviation calculation unit 600, the voltage error tolerance determination unit 610, the micro-variation interval value determination unit 620, the error compensation unit 630, and the control voltage determination unit 640 Or < / RTI >

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 in the appended claims. It will be possible.

Claims (14)

In the battery charging method,
Determining whether a BMS (battery management system) battery measurement DC voltage or a PCS (power conversion system) battery measurement DC voltage is greater than a reference voltage;
Determining if the BMS battery measurement DC voltage or the PCS battery measurement DC voltage is greater than the reference voltage, satisfying the health of the battery;
Determining whether an error between the BMS battery measurement DC voltage and the PCS battery measurement DC voltage is less than a limit of the PCS voltage error when the integrity of the battery is satisfied;
If the error between the BMS battery measurement DC voltage and the PCS battery measurement DC voltage is less than the limit of the PCS voltage error, determining whether the BMS battery measurement DC voltage is absent and the PCS battery measurement DC voltage is present ;
Determining whether the PCS battery measurement DC voltage is greater than the BMS battery warning overvoltage and the PCS battery warning overvoltage when the BMS battery measurement DC voltage is not present and the PCS battery measurement DC voltage is present; And
And performing constant voltage control when the PCS battery measurement DC voltage is greater than the BMS battery warning overvoltage and the PCS battery warning overvoltage. The method according to claim 1,
Wherein the constant voltage control is performed based on a control voltage,
Wherein the control voltage is a value obtained by adding the error compensation amount to the reference voltage,
The error compensation component is a value calculated by comparing the voltage deviation value with the voltage error tolerance value and the minute variation interval value,
Wherein the voltage deviation value is a difference value of the BMS battery measured DC voltage at the reference voltage. 3. The method of claim 2,
Wherein the error compensation amount is determined to be 0 when the voltage deviation value is smaller than the voltage error tolerance value. 3. The method of claim 2,
Wherein the error compensation unit determines whether the voltage deviation value is smaller than the micro variation interval value when the voltage deviation value is not smaller than the voltage error tolerance, Wherein the voltage deviation value is determined by one of a value obtained by dividing a voltage deviation value by N (where N is a natural number). 3. The method of claim 2,
Wherein the error compensation unit determines whether the voltage deviation value is smaller than the micro deviation interval value when the voltage deviation value is not smaller than the voltage error tolerance value and if the voltage deviation value is not smaller than the micro variation interval value Wherein the voltage deviation value is determined by the voltage deviation value. The method according to claim 1,
Performing a battery protection operation when the battery is insufficient; And
And performing the battery protection operation if the error between the BMS battery measurement DC voltage and the PCS battery measurement DC voltage is greater than the limit of the PCS voltage error. The method according to claim 6,
Performing the constant current control when the BMS battery measurement DC voltage or the PCS battery measurement DC voltage is not greater than the reference voltage; And
And performing a constant current control when the PCS battery measurement DC voltage is not greater than the BMS battery warning overvoltage and the PCS battery warning overvoltage. A charging apparatus for a battery, the charging apparatus comprising a processor,
The processor determines whether a battery management system (BMS) battery measurement DC voltage or a power conversion system (PCS) battery measurement DC voltage is greater than a reference voltage,
Determining whether the battery health is satisfied if the BMS battery measurement DC voltage or the PCS battery measurement DC voltage is greater than the reference voltage,
Determining whether the error between the BMS battery measurement DC voltage and the PCS battery measurement DC voltage is less than the limit of the PCS voltage error, if the integrity of the battery is satisfied;
If the error between the BMS battery measurement DC voltage and the PCS battery measurement DC voltage is less than the limit of the PCS voltage error, determining whether the BMS battery measurement DC voltage is absent and the PCS battery measurement DC voltage is present and,
Determining whether the PCS battery measurement DC voltage is greater than the BMS battery warning overvoltage and the PCS battery warning overvoltage when the BMS battery measurement DC voltage is not present and the PCS battery measurement DC voltage is present,
And performs constant voltage control when the PCS battery measurement DC voltage is greater than the BMS battery warning overvoltage and the PCS battery warning overvoltage. 9. The method of claim 8,
Wherein the constant voltage control is performed based on a control voltage,
Wherein the control voltage is a value obtained by adding the error compensation amount to the reference voltage,
The error compensation component is a value calculated by comparing the voltage deviation value with the voltage error tolerance value and the minute variation interval value,
Wherein the voltage deviation value is a difference value of the BMS battery measured DC voltage at the reference voltage. 10. The method of claim 9,
Wherein the error compensation amount is determined to be 0 when the voltage deviation value is smaller than the voltage error tolerance value. 10. The method of claim 9,
Wherein the error compensation unit determines whether the voltage deviation value is smaller than the micro variation interval value when the voltage deviation value is not smaller than the voltage error tolerance, Wherein the voltage deviation value is determined as one of a value obtained by dividing a voltage deviation value by N (where N is a natural number). 10. The method of claim 9,
Wherein the error compensation unit determines whether the voltage deviation value is smaller than the micro deviation interval value when the voltage deviation value is not smaller than the voltage error tolerance value and if the voltage deviation value is not smaller than the micro variation interval value And the voltage deviation value is determined as the voltage deviation value. 9. The apparatus of claim 8,
If the battery is not satisfactory, the battery protection operation is performed,
And performs the battery protection operation when an error between the BMS battery measurement DC voltage and the PCS battery measurement DC voltage is greater than a limit of the PCS voltage error. 14. The apparatus of claim 13,
If the BMS battery measurement DC voltage or the PCS battery measurement DC voltage is not greater than the reference voltage,
Wherein the controller is configured to perform constant current control when the PCS battery measurement DC voltage is not greater than the BMS battery warning overvoltage and the PCS battery warning overvoltage.

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