KR102005399B1 - Device and method of estimating battery statement - Google Patents

Device and method of estimating battery statement Download PDF

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Publication number
KR102005399B1
KR102005399B1 KR1020150153408A KR20150153408A KR102005399B1 KR 102005399 B1 KR102005399 B1 KR 102005399B1 KR 1020150153408 A KR1020150153408 A KR 1020150153408A KR 20150153408 A KR20150153408 A KR 20150153408A KR 102005399 B1 KR102005399 B1 KR 102005399B1
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KR
South Korea
Prior art keywords
change amount
battery
voltage
time interval
connection state
Prior art date
Application number
KR1020150153408A
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Korean (ko)
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KR20170051065A (en
Inventor
이종범
이태호
최해인
Original Assignee
주식회사 엘지화학
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Priority to KR1020150153408A priority Critical patent/KR102005399B1/en
Publication of KR20170051065A publication Critical patent/KR20170051065A/en
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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
    • 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]
    • G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing

Abstract

The present invention provides an apparatus and method for determining a state of a battery based on a voltage change amount of a battery internal resistance.
More specifically, the present invention provides an apparatus and a method for determining whether a connection state of a battery is a charge, discharge, or OCV state according to a voltage change amount of an internal resistance.

Description

Device and method for determining battery connection state {Device and method of estimating battery statement}

The present invention relates to an apparatus and method for determining a connection state of a battery based on a voltage change amount of a battery internal resistance.

More specifically, the present invention relates to an apparatus and a method for determining whether a battery is in a charged state, a discharged state, or an OCV state according to a voltage change amount of the battery.

In general, portable electronic devices such as video cameras, portable telephones, portable PCs, PMPs, MP3 players, and electric vehicles are equipped with batteries capable of repeatedly charging and discharging.

The battery capable of charging and discharging should be controlled to match the state of each battery by determining the state of charge of the battery, the state of discharge, and the state of the OCV.

As a method of determining a connection state of a conventional battery, the connection state of the battery is determined according to a current flowing in the battery internal resistance.

However, the conventional method for determining the battery connection state had to be provided with a module for measuring a separate current.

Accordingly, the present invention proposes an apparatus and method for determining a connection state of a battery based on a change amount of a voltage applied to a resistance inside the battery without providing a module for measuring current separately.

The present invention provides an apparatus and method for determining a state of a battery based on a voltage change amount of a battery internal resistance.

More specifically, the present invention provides an apparatus and a method for determining whether a connection state of a battery is a charge, discharge, or OCV state according to a voltage change amount of an internal resistance.

Method for determining the connection state of the battery according to an embodiment of the present invention, the power supply step of applying power to the BMS, the voltage change measurement step of measuring the change amount of the voltage applied to the internal resistance, the voltage change measurement step It may be configured to include a connection state determination step of determining the connection state of the battery from the result.

The voltage change measuring step may include: a voltage measuring step of periodically measuring a voltage applied to an internal resistance of a battery after voltage is applied to a BMS, and a change amount calculating step of calculating a change amount of the periodic voltage measured in the voltage measuring step Performing a first time interval detection step of searching for a first time interval in which the voltage change amount calculated in the change amount calculation step is equal to or greater than a predetermined value; and performing the voltage measurement step and the change amount calculation step after the first time interval detection step. In this case, the method may include a second time section detecting step of detecting a second time section in which the voltage change amount calculated in the change amount calculating step becomes equal to or greater than a predetermined value.

The determining of the connection state may include determining that the battery starts charging or discharging in the first time section of the voltage change measuring step, and charging or discharging in the first time section in a second time section of the voltage change measuring step. The battery may be determined to be in a state of stopping charging or discharging, and the battery may be determined to be in a state of charging or discharging between the first time interval and the second time interval.

The battery may be determined to be in the OCV state from the time point at which power is applied to the BMS to the first time period and after the second time period and until the voltage change amount is equal to or greater than a predetermined value.

An apparatus for determining a connection state of a battery according to an embodiment of the present invention, a change amount measuring unit for measuring the amount of voltage change applied to the internal resistance of the battery, based on the voltage change amount measured by the change amount measuring unit determines the connection state of the battery It may be configured to include a connection state determination module.

The change amount measuring unit may include a voltage measuring module measuring a voltage applied to an internal resistance of a battery at a predetermined period, a memory storing the voltage measured at the predetermined period, and a change amount calculating module calculating a change amount of a voltage from data stored in the memory. It can be configured to include.

The connection state determination module may include a comparison module for comparing the change amount of the voltage measured by the change amount measuring unit with a predetermined reference value, and the battery is charged and discharged based on the result of the comparison module. , The state of the OCV can be determined and transmitted to the BMS.

More specifically, the comparison module detects the first time interval and the second time interval in which the change amount of the voltage measured by the change amount measuring unit is greater than a predetermined reference value, and the first time period is charged by the battery or It is determined that the discharge is started, and the battery is charged or discharged between the first time interval and the second time interval, and the second time interval is determined as the state in which the battery stops charging or discharging. The battery may be determined to be in the OCV state from the time point at which power is applied to the BMS to the first time period and after the second time period and until the voltage change amount is greater than or equal to a predetermined value.

The present invention can determine whether the battery is in the charge and discharge OCV state based on the voltage change amount of the internal resistance of the battery.

1 is a flowchart illustrating a method of determining a battery connection state according to an exemplary embodiment of the present invention.
2 is a flowchart illustrating a method of determining a battery connection state according to an exemplary embodiment of the present invention.
3 is an operation graph of a method for determining a battery connection state according to an exemplary embodiment of the present invention.
4 is a block diagram of an apparatus for determining a battery connection state according to an exemplary embodiment of the present invention.

Hereinafter, with reference to the contents described in the accompanying drawings will be described in detail an exemplary embodiment according to the present invention. However, the present invention is not limited or limited by the exemplary embodiments. Like reference numerals in the drawings denote members that perform substantially the same function.

Terms including ordinal numbers such as first and second may be used to describe various components, but the components are not 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 the second component, and similarly, the second component may also be referred to as the first component. The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

The terms used in the present invention have been selected as widely used general terms as possible in consideration of the functions in the present invention, but this may vary according to the intention or precedent of the person skilled in the art, the emergence of new technologies and the like. In addition, in certain cases, there is also a term arbitrarily selected by the applicant, in which case the meaning will be described in detail in the description of the invention. Therefore, the terms used in the present invention should be defined based on the meanings of the terms and the contents throughout the present invention, rather than the names of the simple terms.

When any part of the specification is to "include" any component, this means that it may further include other components, except to exclude other components unless otherwise stated.

1. How to determine the battery connection status

1 is a flowchart illustrating a method of determining a battery connection state of the present invention.

Hereinafter, an embodiment of a method for determining a battery connection state of the present invention will be described with reference to FIG. 1.

In the battery connection state determination method of the present invention, a power supply step of applying power to the BMS (S100), a voltage change measurement step of measuring a change amount of a voltage applied to an internal resistance (S200), and the voltage measured in the voltage change measurement step It may be configured to include a connection state determination step (S300) for determining the connection state of the battery based on the amount of change.

2 is a flowchart illustrating a method of determining a battery connection state according to an embodiment of the present invention, and FIG. 3 is a graph of a method of determining a battery connection state according to an embodiment of the present invention.

Hereinafter, a method of determining a battery connection state according to an embodiment of the present invention will be described with reference to FIGS. 2 and 3.

The voltage change measurement step (S200) is a voltage measurement step (S210) for periodically measuring the voltage applied to the internal resistance of the battery after the voltage is applied to the BMS in the power application step, the voltage measurement step (S210) A change amount calculation step (S220) of calculating a change amount of the periodic voltage, and a first time period detection step (S231) of detecting a first time period that the voltage change amount calculated in the change amount calculation step (S220) is equal to or greater than a predetermined value; ), The voltage measurement step S210 and the change amount calculation step S220 are continuously performed after the first time interval detection step S231, and the voltage change amount calculated in the change amount calculation step S220 is predetermined. It may be configured to include a second time interval detection step (S232) for detecting the second time interval that is greater than or equal to the value.

In the change calculation operation S220, when the battery is charged or discharged as in the first time interval and the second time interval in FIG. 3, the voltage applied to the internal resistance of the battery is increased or decreased. Therefore, by measuring the change in the voltage it is possible to determine when the battery starts or stops charging or discharging.

On the other hand, the connection state determination step (S300) is determined as a state in which the battery starts to charge or discharge in the first time interval of the voltage change amount measurement step (S200) (S310), the second time period of the voltage change amount measurement step In operation S330, the battery which has started charging or discharging in the first time section stops charging or discharging, and the battery is determined to be in a charging or discharging state between the first and second time sections. S320).

Meanwhile, the battery may be determined to be in the OCV state (S340) from the time point when the power is applied to the BMS until the first time period and after the second time period and until the voltage change amount is greater than or equal to a predetermined value.

2. Battery connection status determination device

4 is a configuration diagram according to an embodiment of a method for determining a battery connection state of the present invention.

Hereinafter, an embodiment of an apparatus for determining a battery connection state of the present invention will be described with reference to FIG. 4.

According to an embodiment of the present disclosure, an apparatus for determining a battery connection state includes a change amount measuring unit 100 measuring a voltage change amount applied to an internal resistance of a battery, and a connection state of a battery based on a voltage change amount measured by the change amount measuring unit 100. It may be configured to include a connection state determination module 200 to determine.

More specifically, the change amount measuring unit 100 stores the voltage measured at a predetermined period in the voltage measuring module 110 and the voltage measuring module 110 to measure the voltage applied to the battery internal resistance at a predetermined period. The memory 120 may include a calculation module 130 that calculates a change amount of the voltage measured at a predetermined cycle stored in the memory 120.

On the other hand, the state determination module 200 is configured to include a comparison module (not shown) for comparing the change amount of the voltage measured by the change amount measuring unit 100 with a predetermined reference value, the result of the comparison module As a result, it is possible to determine whether the battery is in one of charge, discharge, and OCV states.

More specifically, the comparison module detects the first time period and the second time period in which the change amount of the voltage measured by the change amount measuring unit 100 is greater than a predetermined reference value, and the first time period is determined by the battery. It is determined that the charging or discharging is started, the battery is charged or discharged between the first time interval and the second time interval, and the second time interval is a state in which the battery stops charging or discharging. The battery may be determined to be in the OCV state from the time point at which the power is applied to the BMS 300 to the first time period and after the second time period and until the voltage change amount is greater than or equal to a predetermined value. .

On the other hand, although the technical spirit of the present invention has been described in detail according to the above embodiment, it should be noted that the above embodiment is for the purpose of explanation and not for the limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

100: change amount measuring unit
200: connection status determination module
300: BMS

Claims (7)

In the method of determining the connection state of the battery,
A power applying step of applying power to the BMS;
A voltage change measuring step of measuring a change in voltage applied to the internal resistance;
A connection state determination step of determining a connection state of a battery from a change amount of the voltage measured in the voltage change amount measuring step;
It is configured to include,
The voltage change measuring step,
A voltage measuring step of periodically measuring a voltage applied to an internal resistance of the battery after a voltage is applied to the BMS;
A change amount calculating step of calculating a change amount of the periodic voltage measured in the voltage measuring step;
A first time section detecting step of searching for a first time section in which the voltage change amount calculated in the change amount calculating step becomes equal to or greater than a predetermined value;
After the first time interval detection step,
A second time interval detecting step of performing the voltage measuring step and the change amount calculating step again, and detecting a second time period in which the voltage change amount calculated in the change amount calculating step becomes equal to or greater than a predetermined value;
It is configured to include,
The connection state determination step
In the first time interval of the voltage change measurement step, it is determined that the battery starts charging or discharging.
In the second time interval of the voltage change amount measuring step, it is determined that the battery which started charging or discharging in the first time interval stops charging or discharging.
The battery is determined to be charged or discharged between the first time interval and the second time interval.
Connected state of the battery, characterized in that it is determined that the battery is in the OCV state from the time the power is applied to the BMS to the first time interval and after the second time interval and until the voltage change amount is more than a predetermined value. Judgment method.
delete delete In the device for determining the connection state of the battery,
A change amount measuring unit measuring a change amount of voltage applied to the battery internal resistance;
A connection state determination module that determines a connection state of a battery based on the voltage change amount measured by the change amount measurer;
It is configured to include,
The connection state determination module
A comparison module for comparing a change amount of the voltage measured by the change amount measuring unit with a predetermined reference value;
It is configured to include,
The comparison module
Detecting the first time period and the second time period that the change amount of the voltage measured by the change amount measuring unit is larger than a predetermined reference value,
The first time interval is determined as a state in which the battery starts to charge or discharge,
It is determined that the battery is charged or discharged between the first time interval and the second time interval.
The second time interval determines that the battery stops charging or discharging,
Battery connection state determination device characterized in that it is determined that the battery is in the OCV state from the time the power is applied to the BMS until the first time interval and after the second time interval and until the voltage change amount is more than a predetermined value .
The method according to claim 4,
The change amount measuring unit
A voltage measuring module measuring a voltage applied to the battery internal resistance at predetermined cycles;
A memory for storing the voltage measured at the predetermined period;
A change amount calculating module for calculating a change amount of a voltage from data stored in the memory;
Battery connection state determination device, characterized in that configured to include.
delete delete
KR1020150153408A 2015-11-02 2015-11-02 Device and method of estimating battery statement KR102005399B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11959971B2 (en) 2019-10-02 2024-04-16 Lg Energy Solution, Ltd. Method and system for detecting connection fault of parallel connection cell

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100913766B1 (en) * 2008-12-03 2009-08-25 (주)한위드정보기술 System monitoring state of storage battery
JP2010281723A (en) 2009-06-05 2010-12-16 Furukawa Electric Co Ltd:The Method and instrument for detecting state of electricity storage device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5278509A (en) * 1992-02-03 1994-01-11 At&T Bell Laboratories Method for monitoring battery discharge by determining the second derivative of battery voltage over time

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100913766B1 (en) * 2008-12-03 2009-08-25 (주)한위드정보기술 System monitoring state of storage battery
JP2010281723A (en) 2009-06-05 2010-12-16 Furukawa Electric Co Ltd:The Method and instrument for detecting state of electricity storage device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11959971B2 (en) 2019-10-02 2024-04-16 Lg Energy Solution, Ltd. Method and system for detecting connection fault of parallel connection cell

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