KR20170051065A - Device and method of estimating battery statement - Google Patents

Device and method of estimating battery statement Download PDF

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Publication number
KR20170051065A
KR20170051065A KR1020150153408A KR20150153408A KR20170051065A KR 20170051065 A KR20170051065 A KR 20170051065A KR 1020150153408 A KR1020150153408 A KR 1020150153408A KR 20150153408 A KR20150153408 A KR 20150153408A KR 20170051065 A KR20170051065 A KR 20170051065A
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KR
South Korea
Prior art keywords
battery
voltage
connection state
determining
time interval
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KR1020150153408A
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Korean (ko)
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KR102005399B1 (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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    • G01R31/3606—
    • G01R31/3658—
    • 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 a method for determining a state of a battery based on a voltage change amount of an internal resistance of the battery. More specifically, the present invention provides an apparatus and a method for determining whether a connection state of a battery is a charging, a discharging, and an OCV state according to an internal resistance of the battery.

Description

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

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

And more particularly, to an apparatus and method for determining whether a battery is in a charged state, a discharged state, or an OCV state in accordance with 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 that can be repeatedly charged and discharged.

Such a chargeable / dischargeable battery should be controlled to determine the charge state, discharge state, and OCV state of the battery and to match the state of each battery.

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

However, the conventional method of determining the battery connection state requires a separate module for current measurement.

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 resistor inside a battery without separately providing a module for current measurement.

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

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

A method of determining a connection state of a battery according to an exemplary embodiment of the present invention includes a step of applying power to a BMS, a step of measuring a voltage variation amount to measure a variation amount of a voltage applied to the internal resistance, And determining a connection state of the battery based on the result of the determination.

The voltage variation measurement step may include a voltage measurement step of periodically measuring a voltage applied to the internal resistance of the battery after the voltage is applied to the BMS, a variation calculation step of calculating a variation amount of the periodic voltage measured in the voltage measurement step A first time interval detection step of searching for a first time interval in which the voltage variation amount calculated in the variation amount calculation step is equal to or greater than a predetermined value, and after the first time interval detection step, the voltage measurement step and the variation amount calculation step And a second time interval detection step of detecting a second time interval in which the voltage variation amount calculated in the variation amount calculation step becomes a predetermined value or more.

Wherein the connection state determination step determines that the battery starts charging or discharging in a first time period of the voltage variation amount measurement step and determines that the battery is charged or discharged in the first time interval in the second time interval of the voltage variation amount measurement step, It may be determined that the battery starts charging or discharging, and it may be determined that the battery is charged or discharged between the first time period and the second time period.

The battery can be determined to be in an OCV state from when the power is applied to the BMS until the first time interval and after the second time interval, and before the voltage change amount becomes a predetermined value or more.

An apparatus for determining a connection state of a battery according to an exemplary embodiment of the present invention includes a change amount measurement unit that measures a change amount of a voltage applied to an internal resistance of a battery, a determination unit that determines a connection state of the battery based on the voltage change amount measured by the change amount measurement unit And a connection status determination module for determining connection status.

The change amount measuring unit may include a voltage measuring module for measuring a voltage applied to the internal resistance of the battery at a predetermined cycle, a memory for storing the voltage measured at the predetermined period, a change amount calculating module for calculating a change amount of the voltage from the data stored in the memory And the like.

The connection state determination module may include a comparison module that compares a variation amount of the voltage measured by the variation amount measurement unit with a predetermined reference value, and the battery is charged or discharged based on a result of the comparison module. , And OCV, and transmits the result to the BMS.

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

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

1 is a general flowchart of a battery connection state determination method according to an 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 battery connection state determination method according to an embodiment of the present invention.
4 is a configuration diagram of a battery connection state determination apparatus according to an embodiment of the present invention.

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

Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these 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. 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.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. Also, in certain cases, there may be a term selected arbitrarily by the applicant, in which case the meaning thereof will be described in detail in the description of the corresponding invention. Therefore, the term used in the present invention should be defined based on the meaning of the term, not on the name of a simple term, but on the entire contents of the present invention.

When an element is referred to as "including" an element throughout the specification, it is to be understood that the element may include other elements, without departing from the spirit or scope of the present invention.

1. How to determine battery connection status

1 is a flowchart of an embodiment of a method for determining a battery connection state of the present invention.

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

A method for determining a battery connection state according to the present invention includes a power applying step (S100) for applying power to a BMS, a voltage variation amount measuring step (S200) for measuring a variation amount of a voltage applied to the internal resistance, And a connection state determination step (S300) of determining a connection state of the battery based on the change amount.

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

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

The voltage variation measurement step S200 includes a voltage measurement step S210 for periodically measuring a voltage applied to the internal resistance of the battery after the voltage is applied to the BMS in the power application step S210, A first time interval detection step S231 of detecting a first time interval in which the voltage variation amount calculated in the variation amount calculation step S220 becomes a predetermined value or more, ), The voltage measurement step (S210) and the variation amount calculation step (S220) are continuously performed after the first time interval detection step (S231), and the voltage variation amount calculated in the variation amount calculation step (S220) And a second time interval detecting step (S232) for detecting a second time interval that is equal to or greater than a predetermined value.

When the battery is charged or discharged as in the first time period and the second time period in FIG. 3, the voltage applied to the internal resistance of the battery is increased or decreased. Therefore, by measuring the change in voltage, it is possible to confirm when the battery starts charging or discharging and when the battery is discharged.

In the connection state determination step S300, the battery is determined to start charging or discharging in the first time period of the voltage variation amount measurement step S200 (S310), and the second time period It is determined that the battery which has started charging or discharging in the first time interval is in a state of stopping charging or discharging in step S330 and the battery is determined to be charged or discharged in the first time interval and the second time interval S320).

Meanwhile, the battery may be determined as the OCV state (S340) from when the power is applied to the BMS to the first time interval and after the second time interval and before the voltage variation amount becomes a predetermined value or more.

2. Battery connection status determination device

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

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

The apparatus for determining battery connection status according to an embodiment of the present invention includes a change amount measuring unit 100 for measuring a change amount of a voltage applied to an internal resistance of a battery, And a connection state determination module 200 for determining the connection state.

More specifically, the change amount measuring unit 100 includes a voltage measuring module 110 for measuring a voltage applied to an internal resistance of the battery at a predetermined cycle, a voltage measuring unit 110 for storing a voltage measured at a predetermined period in the voltage measuring module 110 A memory 120, and a calculation module 130 for calculating a change amount of a voltage measured in a predetermined cycle stored in the memory 120. [

The state determination module 200 includes a comparison module (not shown) for comparing a variation amount of the voltage measured by the variation measurement unit 100 with a predetermined reference value, , It is possible to determine whether the battery is in a state of charge, discharge, or OCV.

More specifically, the comparison module detects a first time period and a second time period in which a change amount of the voltage measured by the change amount measuring unit 100 is greater than a predetermined reference value, The battery is judged to be in a state in which charging or discharging is started and in a state in which the battery is charged or discharged in the first time interval and the second time interval and the battery is charged or discharged in the second time interval And may determine that the battery is in an OCV state from the time when power is applied to the BMS 300 until the first time interval and after the second time interval and before the voltage change amount becomes a predetermined value or more .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention.

100:
200: connection status determination module
300: BMS

Claims (7)

A method for determining a connection state of a battery,
A power applying step of applying power to the BMS;
A voltage variation amount measurement step of measuring a variation amount of a voltage applied to the internal resistance;
A connection state determination step of determining a connection state of the battery from a variation amount of the voltage measured in the voltage variation amount measurement step;
And determining a connection state of the battery.
The method according to claim 1,
The voltage change amount measuring step may include:
A voltage measuring step of periodically measuring a voltage applied to the internal resistance of the battery after the voltage is applied to the BMS;
Calculating a variation amount of the periodic voltage measured in the voltage measuring step;
A first time interval detection step of searching for a first time interval in which the voltage variation amount calculated in the variation amount calculation step becomes a predetermined value or more;
After the first time period detecting step,
A second time interval detection step of performing the voltage measurement step and the variation amount calculation step again to detect a second time interval in which the voltage variation amount calculated in the variation amount calculation step becomes a predetermined value or more;
And determining a connection state of the battery.
The method of claim 2,
The connection state determination step
Determining a state in which the battery starts charging or discharging in a first time period of the voltage change amount measuring step;
Determining that the battery which has started charging or discharging in the first time interval stops charging or discharging in a second time period of the voltage change amount measuring step;
Determining that the battery is charged or discharged between the first time interval and the second time interval;
Determining that the battery is in an OCV state from when the power is applied to the BMS until the first time interval and after the second time interval and before the voltage change amount becomes a predetermined value or more;
And determining a connection state of the battery.
An apparatus for determining a connection state of a battery,
A change amount measuring unit for measuring a change amount of the voltage applied to the internal resistance of the battery;
A connection state determination module that determines a connection state of the battery based on the voltage variation measured by the variation measurement unit;
Wherein the battery connection state determining unit determines the battery connection state.
The method of claim 4,
The change amount measuring unit
A voltage measuring module for measuring a voltage applied to the internal resistance of the battery at a predetermined cycle;
A memory for storing a voltage measured in the predetermined period;
A change amount calculating module for calculating a change amount of the voltage from the data stored in the memory;
Wherein the battery connection state determining unit determines the battery connection state.
The method of claim 4,
The connection state determination module
A comparing module for comparing a variation amount of the voltage measured by the variation measuring unit with a predetermined reference value;
And,
Determining whether the battery is charging, discharging, or OCV based on the comparison result of the comparison module, and transmitting the determination result to the BMS.
The method of claim 6,
Wherein the comparison module detects a first time period and a second time period in which a variation amount of the voltage measured by the variation amount measuring unit is larger than a predetermined reference value,
Wherein the first time period is a state in which the battery starts charging or discharging,
The battery is determined to be charged or discharged between the first time interval and the second time interval,
The second time period is determined as a state in which the battery stops charging or discharging,
Wherein the controller determines that the battery is in an OCV state from a time point when power is applied to the BMS to a time point after the first time period and a second time period and before a voltage change amount becomes a predetermined value or more. Determination device.
KR1020150153408A 2015-11-02 2015-11-02 Device and method of estimating battery statement KR102005399B1 (en)

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KR102005399B1 KR102005399B1 (en) 2019-10-01

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KR20210039705A (en) 2019-10-02 2021-04-12 주식회사 엘지화학 Method and system for detecting connection failure in parallel connection cell

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0627207A (en) * 1992-02-03 1994-02-04 American Teleph & Telegr Co <Att> Method of monitoring state of discharge of battery
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0627207A (en) * 1992-02-03 1994-02-04 American Teleph & Telegr Co <Att> Method of monitoring state of discharge of battery
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

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