WO2018079918A1 - Battery cell balancing device - Google Patents

Battery cell balancing device Download PDF

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Publication number
WO2018079918A1
WO2018079918A1 PCT/KR2016/013632 KR2016013632W WO2018079918A1 WO 2018079918 A1 WO2018079918 A1 WO 2018079918A1 KR 2016013632 W KR2016013632 W KR 2016013632W WO 2018079918 A1 WO2018079918 A1 WO 2018079918A1
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WO
WIPO (PCT)
Prior art keywords
cell
battery
converter
cells
overcharge
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PCT/KR2016/013632
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French (fr)
Korean (ko)
Inventor
장병훈
김수열
최진혁
이성은
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한국전력공사
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Publication of WO2018079918A1 publication Critical patent/WO2018079918A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014—Circuits for equalisation of charge between batteries
    • H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
    • 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
    • H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
    • 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
    • H01M10/44—Methods for charging or discharging
    • 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
    • H01M10/44—Methods for charging or discharging
    • H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present application relates to a battery cell balancing device.
  • Battery energy storage system (Battery Energy Storage System) is a device that stores or discharges the electric energy in the battery, if necessary, has been frequently applied to the current power system for the purpose of peak reduction, frequency control and renewable energy stabilization.
  • inter-cell balancing is required to uniformize cell performance.
  • Such cell balancing includes passive cell balancing and active cell balancing.
  • Passive balancing has a disadvantage in that energy is generated by connecting a resistor in parallel to a unit cell and discharging it through a resistor during overvoltage, and the balancing effect is insignificant. Recently, active balancing has been developed.
  • One embodiment of the present invention is to provide a battery cell balancing device that can provide efficient cell balancing by boosting the energy of the overcharged cell to supplement the undercharged cell.
  • the battery cell balancing device includes at least one of a battery module including a plurality of battery cells and at least one of the plurality of battery cells undercharged to a capacity less than a predetermined amount by using energy of at least one overcharged cell that is overcharged to a predetermined or more capacity. It may include a balancing module for charging the lack of charging cells.
  • the balancing module may include a DC-DC converter for boosting energy of the overcharge cell to provide the undercharge cell.
  • the balancing module connects the at least one overcharge cell to an input terminal of the DC-DC converter according to the charge amount of each of the DC-DC converter and the plurality of battery cells, and the at least one shortage. It may include a switch unit for switching operation to connect the charging cell to the output terminal of the DC-DC converter.
  • the battery module may monitor a charge amount of each of the plurality of battery cells, set a battery cell charged above a first reference amount as the overcharge cell, and undercharge the battery cell charged below a second reference amount.
  • the apparatus may further include a detector configured to be a cell, wherein the first reference amount may be equal to or greater than the second reference amount.
  • the balancing module determines the at least one overcharge cell and the at least one undercapacity cell based on the output of the detector and connects the at least one overcharge cell to an input of the DC-DC converter. And a controller for controlling the operation of the switch unit to connect and connect the at least one undercharge battery to an output terminal of the DC-DC converter.
  • the switch unit may include a discharge switch unit including a plurality of discharge switches connected to both ends of the plurality of battery cells and an input terminal of the DC-DC converter, and the both ends of the plurality of battery cells and the DC- It may include a charging switch unit including a plurality of charging switches connected to the output terminal of the DC converter.
  • the plurality of discharge switches respectively correspond to the plurality of charge switches and may be connected in series with each other.
  • the switching states of the plurality of discharge switches may not correspond to each other.
  • the plurality of battery cells may be connected in parallel to each other through the switch unit.
  • the controller if there are a plurality of overcharge cells and a plurality of undercharge cells, the plurality of overcharge cells are all connected to the input terminal of the DC-DC converter and the plurality of undercharge cells are all DC It is possible to control the operation of the switch part to be connected to the output terminal of the direct current converter.
  • the battery cell balancing device may include at least one of the overcharged battery cells according to the amount of charge of each of the battery module including M battery cells, the N DC-DC converters, and the M battery cells.
  • a switch unit connected to an input of any one of the converters, the switching unit being configured to switch at least one of the undercharged battery cells to an output of any one of the N DC-DC converters, wherein M and N are natural numbers. Equation M> N may be satisfied.
  • by boosting the energy of the overcharged cell to supplement the undercharged cell can have an effect that can provide efficient cell balancing.
  • FIG. 1 is a block diagram illustrating a battery cell balancing device according to an embodiment of the present invention.
  • FIG. 2 is a block diagram illustrating a battery cell balancing device according to another embodiment of the present invention.
  • FIG. 3 is a block diagram illustrating an embodiment of the battery module illustrated in FIG. 2.
  • FIG. 4 is a block diagram illustrating an embodiment of the balancing module shown in FIG. 2.
  • FIG. 5 is a block diagram illustrating another embodiment of the balancing module shown in FIG. 2.
  • FIG. 6 is a flowchart illustrating a control method of a battery cell balancing apparatus according to an embodiment of the present invention.
  • FIG. 1 is a block diagram illustrating a battery cell balancing device according to an embodiment of the present invention.
  • a battery cell balancing device may include a battery module 110 and a balancing module 120.
  • the battery module 110 may include a plurality of battery cells.
  • the balancing module 120 may include at least one of a plurality of battery cells that are undercharged to a less than a predetermined capacity by using energy of at least one overcharged battery cell (hereinafter, referred to as an "overcharge cell”) that is overcharged to a predetermined capacity or more.
  • the low charge battery cell (hereinafter, referred to as a “low charge cell”) can be charged.
  • the balancing module 120 may include a DC-DC converter, and the DC-DC converter may boost the energy of the overcharged cell to provide the insufficient charge cell. That is, the overcharge cell may be connected to the input terminal of the DC-DC converter, and the undercharge cell may be connected to the output terminal of the DC-DC converter.
  • the efficiency of balancing can be increased by boosting the energy of the overcharged cell to provide the insufficient charge cell.
  • one or more overcharged cells or undercharged cells may be provided, respectively, and may have different numbers. That is, one or more overcharge cells may be connected to an input terminal of one DC-DC converter, or one or more undercharge cells may be connected to an output terminal of one DC-DC converter.
  • FIG. 2 is a block diagram illustrating a battery cell balancing device according to another embodiment of the present invention.
  • the battery module 110 and the balancing module 120 may be included.
  • the battery module 110 may include a plurality of battery cells 111, and may further include a detector 112 according to an embodiment.
  • an overcharge cell or undercharge cell may exist in the plurality of battery cells 111.
  • the detector 112 may monitor the amount of charge of each of the plurality of battery cells 111 and determine an overcharge cell and an undercharge cell.
  • the detector 112 may set a battery cell charged above the first reference amount as an overcharge cell, and set a battery cell charged below the second reference amount as an undercharge cell.
  • the first reference amount may be equal to or greater than the second reference amount.
  • the battery balancing is more precise.
  • the purpose is to make the battery balancing more rough.
  • the detector 112 is illustrated as being included in the battery module 110, but in some embodiments, the detector 112 may be included in the balancing module 120 instead of the battery module 110.
  • the balancing module 120 may include a DC-DC converter 120 and a switch unit 122. According to an embodiment, the controller 123 may be further included.
  • the DC-DC converter 120 may boost the energy of the overcharge cell to provide the undercharge cell. That is, the overcharge cell may be connected to the input terminal of the DC-DC converter, and the undercharge cell may be connected to the output terminal of the DC-DC converter.
  • the switch unit 122 connects the at least one overcharge cell to an input terminal of the DC-DC converter according to the charge amount of each of the plurality of battery cells, and connects the at least one undercharge cell to an output terminal of the DC-DC converter.
  • the switching operation may be to connect to.
  • the controller 1230 may control the switching operation of the switch unit 122.
  • the controller 1230 can determine at least one overcharge cell and at least one undercapacity cell based on the output of the detector 112.
  • the controller 1230 may operate the switch unit 122 to connect at least one overcharge cell to an input terminal of the DC-DC converter 121 and to connect at least one undercharge cell to an output terminal of the DC-DC converter 121. Can be controlled.
  • the controller 1230 has a plurality of overcharge cells and a plurality of undercharge cells, the plurality of overcharge cells are all connected to the input terminal of the DC-DC converter 121 and the plurality of undercharge cells are all DC. It is possible to control the operation of the switch unit 122 to be connected to the output terminal of the DC converter 121.
  • FIG. 3 is a block diagram illustrating an embodiment of the battery module illustrated in FIG. 2.
  • FIG. 3 a plurality of battery cells and a plurality of detectors respectively connected thereto are illustrated.
  • One end of the battery cell may be connected to the switch unit, and the other end may be connected to one end of the detector.
  • One end of the detector may be connected to the other end of the battery cell, and the other end of the detector may be connected to the controller and the switch unit.
  • the detector may be implemented as various circuits for detecting the capacity of the battery cell, the circuit configuration of the detector is not particularly limited herein.
  • FIG. 4 is a block diagram illustrating an embodiment of the balancing module shown in FIG. 2.
  • FIG. 4 the connection relationship between the battery cell 111, the switch units 122_1 and 122_2 and the DC-DC converter 121 is illustrated.
  • the plurality of battery cells 111 are directly connected to each other, but this may be connected to each other in parallel as an example.
  • the switch units 122_1 and 122_2 may be connected to the plurality of battery cells 111 in parallel. Therefore, the plurality of battery cells 111 may be connected in parallel with each other through the switch units 122_1 and 122_2.
  • the switch units 122_1 and 122_2 may include a discharge switch unit 122_1 and a charge switch unit 122_2.
  • the discharge switch 122_1 may include a plurality of discharge switches connected to both ends of the plurality of battery cells and the input terminal of the DC-DC converter 121.
  • the discharge switch When the discharge switch is connected to the ON state, the battery cell connected thereto is connected to the input terminal of the DC-DC converter 121. Therefore, the discharge switch connected to the overcharge cell may operate in the ON state.
  • the charge switch unit 122_2 may include a plurality of charge switches connected to both ends of the plurality of battery cells and the output end of the DC-DC converter 121.
  • the charge switch When the charge switch is connected to the ON state, the battery cell connected thereto is connected to the output terminal of the DC-DC converter 121.
  • the charge switch connected to the undercharge cell can operate in the ON state.
  • the plurality of discharge switches respectively correspond to the plurality of charge switches and may be connected in series with each other. That is, as shown, each of the plurality of discharge switch and the plurality of charge switch can be connected in series in a 1: 1 correspondence. However, the switching states of the plurality of discharge switches may not correspond to each other.
  • FIG. 5 is a block diagram illustrating another embodiment of the balancing module shown in FIG. 2.
  • One embodiment shown in FIG. 5 relates to an embodiment comprising a plurality of DC-DC converters.
  • M and N may satisfy the formula M> N as a natural number. . That is, the number of DC-DC converters may be smaller than the number of battery cells.
  • the switch unit may be configured to connect at least one of the overcharged battery cells to an input terminal of any one of the N DC-DC converters according to the charge amount of each of the M battery cells, and connect the at least one of the undercharged battery cells to the
  • the switching operation may be performed to connect to an output terminal of any one of the N DC-DC converters.
  • FIG. 6 is a flowchart illustrating a control method of a battery cell balancing apparatus according to an embodiment of the present invention.
  • the battery cell balancing device may detect an overcharge cell and an undercharge cell (S610).
  • the battery cell balancing apparatus checks whether the number of detected overcharged cells is one (S620), and if there is one (S620, yes), the battery cell balancing device may determine whether the number of detected undercharged cells is one (S630).
  • the switching unit may be controlled to provide energy of one overcharge cell to one undercharge cell (S640). Specifically, the switching control may be performed such that one overcharge cell is connected to the input terminal of the DC-DC converter and one undercharge cell is connected to the output terminal of the DC-DC converter.
  • the switching unit may be controlled to provide energy of one overcharged cell to the plurality of undercharged cells (S650). Specifically, the switching control may be performed such that one overcharge cell is connected to the input terminal of the DC-DC converter and a plurality of undercharge cells are connected to the output terminal of the DC-DC converter.
  • the switching unit may be controlled to provide energy of the plurality of overcharged cells to one or more undercharged cells (S660). Specifically, the switching control may be performed such that the plurality of overcharge cells are connected to the input terminal of the DC-DC converter and one or more undercharge cells are connected to the output terminal of the DC-DC converter.
  • the capacity consumed in the overcharge cell is proportionally different according to the capacity difference, so that the overall balancing can be performed without balancing between the overcharge cells. .
  • the same is true for undercharged cells.
  • the structure of the entire system is simple and low cost, and stable balancing is possible.

Abstract

According to one technical aspect of the present invention, a battery cell balancing device can comprise: a battery module comprising a plurality of battery cells; and a balancing module for charging, among the plurality of battery cell, at least one insufficiently charged cell having been insufficiently charged to a capacity less than a predetermined capacity, by using energy of at least one overcharged cell having been overcharged to a capacity greater than or equal to a predetermined capacity. The balancing module can comprise a direct current-direct current converter boosting energy of the overcharged cell and providing the boosted energy to the insufficiently charged cell.

Description

배터리 셀 밸런싱 장치Battery cell balancer
본 출원은 배터리 셀 밸런싱 장치에 관한 것이다.The present application relates to a battery cell balancing device.
배터리 에너지저장장치(Battery Energy Storage System)는 전기에너지를 배터리에 저장 또는 필요시 방전하는 장치로서, 피크저감, 주파수제어 및 신재생출력 안정화 등의 목적으로 최근 전력계통에 빈번히 적용되고 있다.Battery energy storage system (Battery Energy Storage System) is a device that stores or discharges the electric energy in the battery, if necessary, has been frequently applied to the current power system for the purpose of peak reduction, frequency control and renewable energy stabilization.
배터리 에너지저장장치의 배터리 성능저하를 방지하기 위해 셀 성능을 균일하게 하는 셀간 밸런싱이 필요하며, 이러한 셀 밸런싱에는 수동 밸런싱(passive cell balancing)과 능동 밸런싱(active cell balancing)이 있다. In order to prevent deterioration of battery performance of the battery energy storage device, inter-cell balancing is required to uniformize cell performance. Such cell balancing includes passive cell balancing and active cell balancing.
수동 밸런싱은 단위 셀에 병렬로 저항을 연결하여 과전압시 저항을 통해 방전시켜 에너지 손실이 발생하며, 밸런싱의 효과가 미미한 단점이 있어, 최근에는 능동 밸런싱이 개발되고 있다.Passive balancing has a disadvantage in that energy is generated by connecting a resistor in parallel to a unit cell and discharging it through a resistor during overvoltage, and the balancing effect is insignificant. Recently, active balancing has been developed.
그러나, 종래의 능동 밸런싱으로서, 커패시터를 이용하는 방법이 있으나, 이는 밸런싱 효율이 낮은 한계가 있다.However, as a conventional active balancing method, there is a method using a capacitor, but this has a limitation in that the balancing efficiency is low.
또는, 각 배터리 셀마다 직류-직류 변환기를 적용한 방식이 개발되었으나, 이는 회로가 복잡하고 다수의 변환기가 요구되어 가격이 증대되는 문제가 있다.Or, a method in which a DC-DC converter is applied to each battery cell has been developed, but this has a problem in that a circuit is complicated and a number of converters are required, thereby increasing the price.
본 발명의 일 실시 예는, 과충전 셀의 에너지를 승압하여 부족 충전 셀에 보충함으로써 효율적인 셀 밸런싱을 제공할 수 있는 배터리 셀 밸런싱 장치를 제공하는데 있다.One embodiment of the present invention is to provide a battery cell balancing device that can provide efficient cell balancing by boosting the energy of the overcharged cell to supplement the undercharged cell.
본 발명의 일 기술적 측면은 배터리 셀 밸런싱 장치를 제안한다. 상기 배터리 셀 밸런싱 장치는, 복수의 배터리 셀을 포함하는 배터리 모듈 및 상기 복수의 배터리 셀 중에서, 일정 이상의 용량으로 과충전 된 적어도 하나의 과충전 셀의 에너지를 이용하여 일정 미만의 용량으로 부족 충전된 적어도 하나의 부족 충전 셀을 충전하는 밸런싱 모듈을 포함할 수 있다. 상기 밸런싱 모듈은 상기 과충전 셀의 에너지를 승압하여 상기 부족 충전 셀에 제공하는 직류-직류 변환기를 포함할 수 있다.One technical aspect of the present invention proposes a battery cell balancing device. The battery cell balancing device includes at least one of a battery module including a plurality of battery cells and at least one of the plurality of battery cells undercharged to a capacity less than a predetermined amount by using energy of at least one overcharged cell that is overcharged to a predetermined or more capacity. It may include a balancing module for charging the lack of charging cells. The balancing module may include a DC-DC converter for boosting energy of the overcharge cell to provide the undercharge cell.
일 실시예에서, 상기 밸런싱 모듈은, 상기 직류-직류 변환기 및 상기 복수의 배터리 셀 각각의 충전량에 따라, 상기 적어도 하나의 과충전 셀을 상기 직류-직류 변환기의 입력단에 연결하고, 상기 적어도 하나의 부족 충전 셀을 상기 직류-직류 변환기의 출력단에 연결하도록 스위칭 동작하는 스위치부를 포함할 수 있다.In one embodiment, the balancing module connects the at least one overcharge cell to an input terminal of the DC-DC converter according to the charge amount of each of the DC-DC converter and the plurality of battery cells, and the at least one shortage. It may include a switch unit for switching operation to connect the charging cell to the output terminal of the DC-DC converter.
일 실시예에서, 상기 배터리 모듈은, 상기 복수의 배터리 셀 각각의 충전량을 모니터링하고, 제1 기준량 이상 충전된 배터리 셀을 상기 과충전 셀로 설정하고, 제2 기준량 미만으로 충전된 배터리 셀을 상기 부족 충전 셀로 설정하는 검출기를 더 포함하고, 상기 제1 기준량은 상기 제2 기준량과 같거나 그보다 클 수 있다.In example embodiments, the battery module may monitor a charge amount of each of the plurality of battery cells, set a battery cell charged above a first reference amount as the overcharge cell, and undercharge the battery cell charged below a second reference amount. The apparatus may further include a detector configured to be a cell, wherein the first reference amount may be equal to or greater than the second reference amount.
일 실시예에서, 상기 밸런싱 모듈은, 상기 검출기의 출력을 기초로 상기 적어도 하나의 과충전 셀 및 상기 적어도 하나의 부족 축전 셀을 결정하고, 상기 적어도 하나의 과충전 셀을 상기 직류-직류 변환기의 입력단에 연결하고 상기 적어도 하나의 부족 충전 셀을 상기 직류-직류 변환기의 출력단에 연결하도록 상기 스위치부의 동작을 제어하는 제어기를 더 포함할 수 있다.In one embodiment, the balancing module determines the at least one overcharge cell and the at least one undercapacity cell based on the output of the detector and connects the at least one overcharge cell to an input of the DC-DC converter. And a controller for controlling the operation of the switch unit to connect and connect the at least one undercharge battery to an output terminal of the DC-DC converter.
일 실시예에서, 상기 스위치부는, 상기 복수의 배터리 셀의 양단 및 상기 직류-직류 변환기의 입력단에 연결되는 복수의 방전 스위치를 포함하는 방전 스위치부 및 상기 복수의 배터리 셀의 상기 양단 및 상기 직류-직류 변환기의 출력단에 연결되는 복수의 충전 스위치를 포함하는 충전 스위치부를 포함할 수 있다.In an exemplary embodiment, the switch unit may include a discharge switch unit including a plurality of discharge switches connected to both ends of the plurality of battery cells and an input terminal of the DC-DC converter, and the both ends of the plurality of battery cells and the DC- It may include a charging switch unit including a plurality of charging switches connected to the output terminal of the DC converter.
일 실시예에서, 상기 복수의 방전 스위치는 상기 복수의 충전 스위치에 각각 대응하며 서로 직렬 연결될 수 있다.In one embodiment, the plurality of discharge switches respectively correspond to the plurality of charge switches and may be connected in series with each other.
일 실시예에서, 상기 복수의 방전 스위치의 스위칭 상태는 상기 복수의 충전 스위치의 스위칭 상태에 서로 대응하지 않을 수 있다.In an embodiment, the switching states of the plurality of discharge switches may not correspond to each other.
일 실시예에서, 상기 복수의 배터리 셀은 상기 스위치부를 통하여 서로 병렬 연결될 수 있다.In one embodiment, the plurality of battery cells may be connected in parallel to each other through the switch unit.
일 실시예에서, 상기 제어기는, 상기 과충전 셀이 복수개이고 상기 부족 충전 셀이 복수개 이면, 상기 복수개의 과충전 셀이 모두 상기 직류-직류 변환기의 입력단에 연결되고 상기 복수개의 부족 충전 셀이 모두 상기 직류-직류 변환기의 출력단에 연결되도록 상기 스위치부의 동작을 제어할 수 있다.In one embodiment, the controller, if there are a plurality of overcharge cells and a plurality of undercharge cells, the plurality of overcharge cells are all connected to the input terminal of the DC-DC converter and the plurality of undercharge cells are all DC It is possible to control the operation of the switch part to be connected to the output terminal of the direct current converter.
본 발명의 다른 일 기술적 측면은 배터리 셀 밸런싱 장치의 다른 실시예를 제안한다. 상기 배터리 셀 밸런싱 장치는, M개의 배터리 셀을 포함하는 배터리 모듈, N개의 직류-직류 변환기 및 상기 M개의 배터리 셀 각각의 충전량에 따라, 적어도 하나의 상기 과충전된 배터리 셀을 상기 N개의 직류-직류 변환기 중 어느 하나의 입력단에 연결하고, 적어도 하나의 상기 부족 충전된 배터리 셀을 상기 N개의 직류-직류 변환기 중 어느 하나의 출력단에 연결하도록 스위칭 동작하는 스위치부를 포함하고, 상기 M 및 N은 자연수로서 수식 M>N 을 만족할 수 있다.Another technical aspect of the present invention proposes another embodiment of a battery cell balancing device. The battery cell balancing device may include at least one of the overcharged battery cells according to the amount of charge of each of the battery module including M battery cells, the N DC-DC converters, and the M battery cells. A switch unit connected to an input of any one of the converters, the switching unit being configured to switch at least one of the undercharged battery cells to an output of any one of the N DC-DC converters, wherein M and N are natural numbers. Equation M> N may be satisfied.
상기한 과제의 해결 수단은, 본 발명의 특징을 모두 열거한 것은 아니다. 본 발명의 과제 해결을 위한 다양한 수단들은 이하의 상세한 설명의 구체적인 실시형태를 참조하여 보다 상세하게 이해될 수 있을 것이다.Means for solving the above problems do not enumerate all the features of the present invention. Various means for solving the problems of the present invention will be understood in more detail with reference to specific embodiments of the following detailed description.
본 발명의 일 실시형태에 따르면, 과충전 셀의 에너지를 승압하여 부족 충전 셀에 보충함으로써 효율적인 셀 밸런싱을 제공할 수 있는 효과를 가질 수 있다. According to one embodiment of the present invention, by boosting the energy of the overcharged cell to supplement the undercharged cell can have an effect that can provide efficient cell balancing.
본 발명의 일 실시형태에 따르면, 보다 적은 수의 직류-직류 컨버터를 이용하여 다수의 배터리 셀의 밸런싱을 제공할 수 있는 효과를 가질 수 있다. According to one embodiment of the present invention, it is possible to have the effect of providing balancing of a plurality of battery cells using a smaller number of DC-DC converters.
본 발명의 일 실시형태에 따르면, 복수의 과충전 셀 또는 복수의 부족 충전 셀을 하나의 직류-직류 컨버터를 이용하여 밸런싱을 수행함으로써, 셀 밸런싱의 효율을 증대시킬 수 있는 효과를 가질 수 있다. According to one embodiment of the present invention, by balancing a plurality of overcharge cells or a plurality of undercharge cells using one DC-DC converter, it is possible to increase the efficiency of cell balancing.
도 1은 본 발명의 일 실시예에 따른 배터리 셀 밸런싱 장치를 도시하는 블록 구성도이다.1 is a block diagram illustrating a battery cell balancing device according to an embodiment of the present invention.
도 2는 본 발명의 다른 일 실시예에 따른 배터리 셀 밸런싱 장치를 도시하는 블록 구성도이다. 2 is a block diagram illustrating a battery cell balancing device according to another embodiment of the present invention.
도 3은 도 2에 도시된 배터리 모듈의 일 실시예를 도시하는 블록 구성도이다.FIG. 3 is a block diagram illustrating an embodiment of the battery module illustrated in FIG. 2.
도 4는 도 2에 도시된 밸런싱 모듈의 일 실시예를 도시하는 블록 구성도이다.4 is a block diagram illustrating an embodiment of the balancing module shown in FIG. 2.
도 5는 도 2에 도시된 밸런싱 모듈의 다른 일 실시예를 도시하는 블록 구성도이다.FIG. 5 is a block diagram illustrating another embodiment of the balancing module shown in FIG. 2.
도 6은 본 발명의 일 실시예에 따른 배터리 셀 밸런싱 장치의 제어 방법을 도시하는 순서도이다.6 is a flowchart illustrating a control method of a battery cell balancing apparatus according to an embodiment of the present invention.
이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시 형태들을 설명한다.Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.
그러나, 본 발명의 실시형태는 여러 가지 다른 형태로 변형될 수 있으며, 본 발명의 범위가 이하 설명하는 실시 형태로 한정되는 것은 아니다. 또한, 본 발명의 실시형태는 당해 기술분야에서 평균적인 지식을 가진 자에게 본 발명을 더욱 완전하게 설명하기 위해서 제공되는 것이다. 본 발명의 다양한 실시 예는 서로 다르지만 상호 배타적일 필요는 없음이 이해되어야 한다.However, embodiments of the present invention may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below. In addition, the embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art. It is to be understood that the various embodiments of the invention are different, but need not be mutually exclusive.
또한, 어떤 구성 요소를 '포함'한다는 것은, 특별히 반대되는 기재가 없는 한 다른 구성 요소를 제외하는 것이 아니라 다른 구성 요소를 더 포함할 수 있다는 것을 의미한다.In addition, "including" a certain component means that it may further include other components, without excluding other components, unless specifically stated otherwise.
도 1은 본 발명의 일 실시예에 따른 배터리 셀 밸런싱 장치를 도시하는 블록 구성도이다.1 is a block diagram illustrating a battery cell balancing device according to an embodiment of the present invention.
도 1을 참조하면, 배터리 셀 밸런싱 장치는 배터리 모듈(110) 및 밸런싱 모듈(120)을 포함할 수 있다.Referring to FIG. 1, a battery cell balancing device may include a battery module 110 and a balancing module 120.
배터리 모듈(110)은 복수의 배터리 셀을 포함할 수 있다.The battery module 110 may include a plurality of battery cells.
밸런싱 모듈(120)은 복수의 배터리 셀 중에서, 일정 이상의 용량으로 과충전 된 적어도 하나의 과충전 배터리 셀(이하, '과충전 셀'이라 칭함)의 에너지를 이용하여 일정 미만의 용량으로 부족 충전된 적어도 하나의 부족 충전 배터리 셀(이하, '부족 충전 셀'이라 칭함)을 충전할 수 있다.The balancing module 120 may include at least one of a plurality of battery cells that are undercharged to a less than a predetermined capacity by using energy of at least one overcharged battery cell (hereinafter, referred to as an "overcharge cell") that is overcharged to a predetermined capacity or more. The low charge battery cell (hereinafter, referred to as a "low charge cell") can be charged.
밸런싱 모듈(120)은 직류-직류 변환기를 포함할 수 있고, 직류-직류 변환기는 과충전 셀의 에너지를 승압하여 부족 충전 셀에 제공할 수 있다. 즉, 직류-직류 변환기의 입력단에는 과충전 셀이 연결되고, 직류-직류 변환기의 출력단에는 부족 충전 셀이 연결될 수 있다. The balancing module 120 may include a DC-DC converter, and the DC-DC converter may boost the energy of the overcharged cell to provide the insufficient charge cell. That is, the overcharge cell may be connected to the input terminal of the DC-DC converter, and the undercharge cell may be connected to the output terminal of the DC-DC converter.
이와 같이, 과충전 셀의 에너지를 승압하여 부족 충전 셀에 제공함으로써, 밸런싱의 효율을 증대시킬 수 있다.In this way, the efficiency of balancing can be increased by boosting the energy of the overcharged cell to provide the insufficient charge cell.
한편, 과충전 셀이나 부족 충전 셀은 각각 하나 이상일 수 있으며, 서로 다른 개수일 수 있다. 즉, 하나의 직류-직류 변환기의 입력단에 하나 이상의 과충전 셀이 연결되거나, 또는 하나의 직류-직류 변환기의 출력단에 하나 이상의 부족 충전 셀이 연결될 수 있다.Meanwhile, one or more overcharged cells or undercharged cells may be provided, respectively, and may have different numbers. That is, one or more overcharge cells may be connected to an input terminal of one DC-DC converter, or one or more undercharge cells may be connected to an output terminal of one DC-DC converter.
도 2는 본 발명의 다른 일 실시예에 따른 배터리 셀 밸런싱 장치를 도시하는 블록 구성도이다. 2 is a block diagram illustrating a battery cell balancing device according to another embodiment of the present invention.
도 2를 참조하면, 배터리 모듈(110) 및 밸런싱 모듈(120)을 포함할 수 있다.Referring to FIG. 2, the battery module 110 and the balancing module 120 may be included.
배터리 모듈(110)은 복수의 배터리 셀(111)을 포함할 수 있으며, 실시예에 따라 검출기(112)를 더 포함할 수 있다.The battery module 110 may include a plurality of battery cells 111, and may further include a detector 112 according to an embodiment.
복수의 배터리 셀(111)에는 과충전 셀이나 부족 충전 셀이 존재할 수 있음은 상술한 바와 같다.As described above, an overcharge cell or undercharge cell may exist in the plurality of battery cells 111.
검출기(112)는 복수의 배터리 셀(111) 각각의 충전량을 모니터링하고, 과충전 셀과 부족 충전 셀을 결정할 수 있다. The detector 112 may monitor the amount of charge of each of the plurality of battery cells 111 and determine an overcharge cell and an undercharge cell.
일 예로, 검출기(112)는 제1 기준량 이상 충전된 배터리 셀을 과충전 셀로 설정하고, 제2 기준량 미만으로 충전된 배터리 셀을 부족 충전 셀로 설정할 수 있다. 여기에서, 상기 제1 기준량은 상기 제2 기준량과 같거나 그보다 클 수 있다.For example, the detector 112 may set a battery cell charged above the first reference amount as an overcharge cell, and set a battery cell charged below the second reference amount as an undercharge cell. Here, the first reference amount may be equal to or greater than the second reference amount.
예컨대, 제1 기준량과 제2 기준량이 같거나 일정 범위 안쪽으로 비슷한 경우는, 배터리 밸런싱을 보다 정밀하게 하도록 하기 위함이다.For example, when the first reference amount and the second reference amount are the same or similar within a predetermined range, the battery balancing is more precise.
다른 예로, 제1 기준량과 제2 기준량이 일정 범위 이상으로 차이나는 경우는, 배터리 밸런싱을 보다 러프하게 하도록 하기 위함이다. As another example, when the first reference amount and the second reference amount differ by more than a predetermined range, the purpose is to make the battery balancing more rough.
한편, 도시된 예에서, 검출기(112)는 배터리 모듈(110)에 포함되는 것으로 도시되었으나, 실시예에 따라 검출기(112)는 배터리 모듈(110)가 아닌 밸런싱 모듈(120)에 포함될 수도 있다. Meanwhile, in the illustrated example, the detector 112 is illustrated as being included in the battery module 110, but in some embodiments, the detector 112 may be included in the balancing module 120 instead of the battery module 110.
밸런싱 모듈(120)은 직류-직류 변환기(120) 및 스위치부(122)를 포함할 수 있다. 실시예에 따라 제어기(123)를 더 포함할 수 있다.The balancing module 120 may include a DC-DC converter 120 and a switch unit 122. According to an embodiment, the controller 123 may be further included.
직류-직류 변환기(120)는 과충전 셀의 에너지를 승압하여 부족 충전 셀에 제공할 수 있다. 즉, 직류-직류 변환기의 입력단에는 과충전 셀이 연결되고, 직류-직류 변환기의 출력단에는 부족 충전 셀이 연결될 수 있다.The DC-DC converter 120 may boost the energy of the overcharge cell to provide the undercharge cell. That is, the overcharge cell may be connected to the input terminal of the DC-DC converter, and the undercharge cell may be connected to the output terminal of the DC-DC converter.
스위치부(122)는 상기 복수의 배터리 셀 각각의 충전량에 따라, 상기 적어도 하나의 과충전 셀을 상기 직류-직류 변환기의 입력단에 연결하고, 상기 적어도 하나의 부족 충전 셀을 상기 직류-직류 변환기의 출력단에 연결하도록 스위칭 동작할 수 있다.The switch unit 122 connects the at least one overcharge cell to an input terminal of the DC-DC converter according to the charge amount of each of the plurality of battery cells, and connects the at least one undercharge cell to an output terminal of the DC-DC converter. The switching operation may be to connect to.
제어기(1230)는 스위치부(122)의 스위칭 동작을 제어할 수 있다. The controller 1230 may control the switching operation of the switch unit 122.
예컨대, 제어기(1230)는 검출기(112)의 출력을 기초로 적어도 하나의 과충전 셀 및 적어도 하나의 부족 축전 셀을 결정할 수 있다. 제어기(1230)는 적어도 하나의 과충전 셀을 직류-직류 변환기(121)의 입력단에 연결하고, 적어도 하나의 부족 충전 셀을 직류-직류 변환기(121)의 출력단에 연결하도록 스위치부(122)의 동작을 제어할 수 있다.For example, the controller 1230 can determine at least one overcharge cell and at least one undercapacity cell based on the output of the detector 112. The controller 1230 may operate the switch unit 122 to connect at least one overcharge cell to an input terminal of the DC-DC converter 121 and to connect at least one undercharge cell to an output terminal of the DC-DC converter 121. Can be controlled.
일 실시예에서, 제어기(1230)는 과충전 셀이 복수 개이고 부족 충전 셀이 복수 개이면, 복수개의 과충전 셀이 모두 직류-직류 변환기(121)의 입력단에 연결되고 복수개의 부족 충전 셀이 모두 상기 직류-직류 변환기(121)의 출력단에 연결되도록 스위치부(122)의 동작을 제어할 수 있다.In one embodiment, if the controller 1230 has a plurality of overcharge cells and a plurality of undercharge cells, the plurality of overcharge cells are all connected to the input terminal of the DC-DC converter 121 and the plurality of undercharge cells are all DC. It is possible to control the operation of the switch unit 122 to be connected to the output terminal of the DC converter 121.
도 3은 도 2에 도시된 배터리 모듈의 일 실시예를 도시하는 블록 구성도이다.FIG. 3 is a block diagram illustrating an embodiment of the battery module illustrated in FIG. 2.
도 3을 참조하면, 복수의 배터리 셀과, 그에 각각 연결된 복수의 검출기가 도시되어 있다.Referring to FIG. 3, a plurality of battery cells and a plurality of detectors respectively connected thereto are illustrated.
배터리 셀의 일 단은 스위치부에, 타 단은 검출기의 일 단에 연결될 수 있다. 검출기의 일 단은 배터리 셀의 타 단에 연결되고, 검출기의 타 단은 제어기 및 스위치부에 연결될 수 있다.One end of the battery cell may be connected to the switch unit, and the other end may be connected to one end of the detector. One end of the detector may be connected to the other end of the battery cell, and the other end of the detector may be connected to the controller and the switch unit.
검출기는 배터리 셀의 용량을 검출하는 다양한 회로로서 구현될 수 있으므로, 본 명세서에서 검출기의 회로 구성을 특별히 한정하지는 아니한다.Since the detector may be implemented as various circuits for detecting the capacity of the battery cell, the circuit configuration of the detector is not particularly limited herein.
도 4는 도 2에 도시된 밸런싱 모듈의 일 실시예를 도시하는 블록 구성도이다.4 is a block diagram illustrating an embodiment of the balancing module shown in FIG. 2.
도 4에서는, 배터리 셀(111)과, 스위치부(122_1, 122_2) 및 직류-직류 변환기(121)의 연결 관계를 도시하고 있다.In FIG. 4, the connection relationship between the battery cell 111, the switch units 122_1 and 122_2 and the DC-DC converter 121 is illustrated.
도시된 예에서, 복수의 배터리 셀(111)은 상호 직열 연결되어 있으나, 이는 예시적인 것으로서 상호 병렬 연결될 수도 있다.In the illustrated example, the plurality of battery cells 111 are directly connected to each other, but this may be connected to each other in parallel as an example.
스위치부(122_1, 122_2)는 복수의 배터리 셀(111)과 병렬 관계로 연결될 수 있다. 따라서, 복수의 배터리 셀(111)은 스위치부(122_1, 122_2)를 통하여 서로 병렬 연결될 수 있다.The switch units 122_1 and 122_2 may be connected to the plurality of battery cells 111 in parallel. Therefore, the plurality of battery cells 111 may be connected in parallel with each other through the switch units 122_1 and 122_2.
일 실시예에서, 스위치부(122_1, 122_2)는 방전 스위치부(122_1) 및 충전 스위치부(122_2)를 포함할 수 있다.In an embodiment, the switch units 122_1 and 122_2 may include a discharge switch unit 122_1 and a charge switch unit 122_2.
방전 스위치부(122_1)는 복수의 배터리 셀의 양 단 및 직류-직류 변환기(121)의 입력단에 연결되는 복수의 방전 스위치를 포함할 수 있다. 방전 스위치가 ON 상태로 연결되면 그에 연결된 배터리 셀은 직류-직류 변환기(121)의 입력단에 연결된다. 따라서, 과충전 셀과 연결된 방전 스위치는 ON 상태로 동작할 수 있다.The discharge switch 122_1 may include a plurality of discharge switches connected to both ends of the plurality of battery cells and the input terminal of the DC-DC converter 121. When the discharge switch is connected to the ON state, the battery cell connected thereto is connected to the input terminal of the DC-DC converter 121. Therefore, the discharge switch connected to the overcharge cell may operate in the ON state.
충전 스위치부(122_2)는 복수의 배터리 셀의 양 단 및 직류-직류 변환기(121)의 출력단에 연결되는 복수의 충전 스위치를 포함할 수 있다.The charge switch unit 122_2 may include a plurality of charge switches connected to both ends of the plurality of battery cells and the output end of the DC-DC converter 121.
충전 스위치가 ON 상태로 연결되면 그에 연결된 배터리 셀은 직류-직류 변환기(121)의 출력단에 연결된다. 따라서, 부족 충전 셀과 연결된 충전 스위치는 ON 상태로 동작할 수 있다.When the charge switch is connected to the ON state, the battery cell connected thereto is connected to the output terminal of the DC-DC converter 121. Thus, the charge switch connected to the undercharge cell can operate in the ON state.
복수의 방전 스위치는 복수의 충전 스위치에 각각 대응하며 서로 직렬 연결될 수 있다. 즉, 도시된 바와 같이, 복수의 방전 스위치와 복수의 충전 스위치는 각각 1:1로 대응하여 직렬 연결될 수 있다. 다만, 복수의 방전 스위치의 스위칭 상태는 상기 복수의 충전 스위치의 스위칭 상태에 서로 대응하지 않을 수 있다. The plurality of discharge switches respectively correspond to the plurality of charge switches and may be connected in series with each other. That is, as shown, each of the plurality of discharge switch and the plurality of charge switch can be connected in series in a 1: 1 correspondence. However, the switching states of the plurality of discharge switches may not correspond to each other.
도 5는 도 2에 도시된 밸런싱 모듈의 다른 일 실시예를 도시하는 블록 구성도이다. 도 5에 도시된 일 실시예는 복수의 직류-직류 변환기를 포함하는 실시예에 관한 것이다.FIG. 5 is a block diagram illustrating another embodiment of the balancing module shown in FIG. 2. One embodiment shown in FIG. 5 relates to an embodiment comprising a plurality of DC-DC converters.
도 5를 참조하면, 복수의 배터리 셀은 M개이고, 직류-직류 변환기는 N개 일 수 있으며(도시된 예에서는 2개), 이러한 경우, M 및 N은 자연수로서 수식 M>N 을 만족할 수 있다. 즉, 직류-직류 변환기의 개수는 배터리 셀의 개수보다 작을 수 있다.Referring to FIG. 5, there are M battery cells and N DC-DC converters (two in the illustrated example). In this case, M and N may satisfy the formula M> N as a natural number. . That is, the number of DC-DC converters may be smaller than the number of battery cells.
한편, 스위치부는 M개의 배터리 셀 각각의 충전량에 따라, 적어도 하나의 상기 과충전된 배터리 셀을 상기 N개의 직류-직류 변환기 중 어느 하나의 입력단에 연결하고, 적어도 하나의 상기 부족 충전된 배터리 셀을 상기 N개의 직류-직류 변환기 중 어느 하나의 출력단에 연결하도록 스위칭 동작할 수 있다.The switch unit may be configured to connect at least one of the overcharged battery cells to an input terminal of any one of the N DC-DC converters according to the charge amount of each of the M battery cells, and connect the at least one of the undercharged battery cells to the The switching operation may be performed to connect to an output terminal of any one of the N DC-DC converters.
도 6은 본 발명의 일 실시예에 따른 배터리 셀 밸런싱 장치의 제어 방법을 도시하는 순서도이다.6 is a flowchart illustrating a control method of a battery cell balancing apparatus according to an embodiment of the present invention.
도 6을 참조하면, 배터리 셀 밸런싱 장치는 과충전 셀 및 부족 충전 셀을 검출할 수 있다(S610).Referring to FIG. 6, the battery cell balancing device may detect an overcharge cell and an undercharge cell (S610).
배터리 셀 밸런싱 장치는 검출된 과충전 셀의 개수가 한 개인지 확인하고(S620), 만약 1개이면(S620, 예) 검출된 부족 충전 셀의 개수가 한 개인지 확인할 수 있다(S630).The battery cell balancing apparatus checks whether the number of detected overcharged cells is one (S620), and if there is one (S620, yes), the battery cell balancing device may determine whether the number of detected undercharged cells is one (S630).
만약, 부족 충전 셀의 개수도 한 개 이면(S630, 예), 하나의 과충전 셀의 에너지를 하나의 부족 충전 셀에 제공하도록 스위칭부를 제어할 수 있다(S640). 구체적으로, 하나의 과충전 셀을 직류-직류 컨버터의 입력단에, 하나의 부족 충전 셀을 직류-직류 컨버터의 출력단에 연결되도록 스위칭 제어할 수 있다.If the number of undercharge cells is also one (S630), the switching unit may be controlled to provide energy of one overcharge cell to one undercharge cell (S640). Specifically, the switching control may be performed such that one overcharge cell is connected to the input terminal of the DC-DC converter and one undercharge cell is connected to the output terminal of the DC-DC converter.
만약, 과충전 셀의 개수가 한 개이나, 부족 충전 셀의 개수는 복수 개 이면(S630, 아니오), 하나의 과충전 셀의 에너지를 복수의 부족 충전 셀에 제공하도록 스위칭부를 제어할 수 있다(S650). 구체적으로, 하나의 과충전 셀을 직류-직류 컨버터의 입력단에, 복수의 부족 충전 셀을 직류-직류 컨버터의 출력단에 연결되도록 스위칭 제어할 수 있다.If the number of overcharged cells is one, but the number of undercharged cells is plural (S630, NO), the switching unit may be controlled to provide energy of one overcharged cell to the plurality of undercharged cells (S650). . Specifically, the switching control may be performed such that one overcharge cell is connected to the input terminal of the DC-DC converter and a plurality of undercharge cells are connected to the output terminal of the DC-DC converter.
만약, 과충전 셀의 개수가 복수 개이면(S620, 아니오), 복수의 과충전 셀의 에너지를 하나 이상의 부족 충전 셀에 제공하도록 스위칭부를 제어할 수 있다(S660). 구체적으로, 복수의 과충전 셀을 직류-직류 컨버터의 입력단에, 하나 이상의 부족 충전 셀을 직류-직류 컨버터의 출력단에 연결되도록 스위칭 제어할 수 있다.If the number of overcharged cells is plural (S620, no), the switching unit may be controlled to provide energy of the plurality of overcharged cells to one or more undercharged cells (S660). Specifically, the switching control may be performed such that the plurality of overcharge cells are connected to the input terminal of the DC-DC converter and one or more undercharge cells are connected to the output terminal of the DC-DC converter.
이상에서 살펴본 바와 같이, 과충전 셀이나 부족 충전 셀이 복수개 인 경우에도, 이들을 그룹화하여 동시에 밸런싱을 수행하므로, 밸런싱이 빠르며 밸런싱 효율이 높아진다.As described above, even when there are a plurality of overcharged cells or undercharged cells, since they are grouped together to perform balancing at the same time, the balancing is faster and the balancing efficiency is increased.
또한, 복수의 과충전 셀이 동시에 직류-직류 컨버터에 연결되는 경우, 용량차이에 따라 과충전 셀에서 소모되는 용량도 비례하여 다르므로, 별도의 과충전 셀 간의 밸런싱이 없이도 전체적으로 밸런싱이 이루어지는 효과를 가질 수 있다. 이는 부족 충전 셀의 경우에서도 마찬가지 이다.In addition, when a plurality of overcharge cells are connected to the DC-DC converter at the same time, the capacity consumed in the overcharge cell is proportionally different according to the capacity difference, so that the overall balancing can be performed without balancing between the overcharge cells. . The same is true for undercharged cells.
또한, 직류-직류 컨버터의 개수는 배터리 셀의 개수보다 작으므로, 전체 시스템의 구조가 간단하고 비용이 저렴하게 소요되면서도, 안정적인 밸런싱이 가능하다.In addition, since the number of DC-DC converters is smaller than the number of battery cells, the structure of the entire system is simple and low cost, and stable balancing is possible.
이상에서 본 발명이 구체적인 구성요소 등과 같은 특정 사항들과 한정된 실시예 및 도면에 의해 설명되었으나, 이는 본 발명의 보다 전반적인 이해를 돕기 위해서 제공된 것일 뿐, 본 발명이 상기 실시예들에 한정되는 것은 아니며, 본 발명이 속하는 기술분야에서 통상적인 지식을 가진 자라면 이러한 기재로부터 다양한 수정 및 변형을 꾀할 수 있다.Although the present invention has been described by specific embodiments such as specific components and the like, but the embodiments and the drawings are provided to assist in a more general understanding of the present invention, the present invention is not limited to the above embodiments. For those skilled in the art, various modifications and variations can be made from these descriptions.
따라서, 본 발명의 사상은 상기 설명된 실시예에 국한되어 정해져서는 아니 되며, 후술하는 특허청구범위뿐만 아니라 이 특허청구범위와 균등하게 또는 등가적으로 변형된 모든 것들은 본 발명의 사상의 범주에 속한다고 할 것이다.Accordingly, the spirit of the present invention should not be limited to the above-described embodiments, and all of the equivalents or equivalents of the claims, as well as the appended claims, fall within the scope of the spirit of the present invention. I will say.

Claims (10)

  1. 복수의 배터리 셀을 포함하는 배터리 모듈; 및A battery module including a plurality of battery cells; And
    상기 복수의 배터리 셀 중에서, 일정 이상의 용량으로 과충전 된 적어도 하나의 과충전 셀의 에너지를 이용하여 일정 미만의 용량으로 부족 충전된 적어도 하나의 부족 충전 셀을 충전하는 밸런싱 모듈; 을 포함하고,A balancing module configured to charge at least one undercharged cell that is undercharged to a less than a predetermined capacity by using energy of at least one overcharged cell that is overcharged to a predetermined capacity or more among the plurality of battery cells; Including,
    상기 밸런싱 모듈은The balancing module
    상기 과충전 셀의 에너지를 승압하여 상기 부족 충전 셀에 제공하는 직류-직류 변환기를 포함하는 배터리 셀 밸런싱 장치.And a DC-DC converter for boosting energy of the overcharge cell to provide the undercharge cell.
  2. 제1항에 있어서, 상기 밸런싱 모듈은The method of claim 1, wherein the balancing module
    상기 직류-직류 변환기; 및The DC-DC converter; And
    상기 복수의 배터리 셀 각각의 충전량에 따라, 상기 적어도 하나의 과충전 셀을 상기 직류-직류 변환기의 입력단에 연결하고, 상기 적어도 하나의 부족 충전 셀을 상기 직류-직류 변환기의 출력단에 연결하도록 스위칭 동작하는 스위치부;Switching the at least one overcharge cell to an input of the DC-DC converter and to connect the at least one undercharge cell to an output of the DC-DC converter according to a charge amount of each of the plurality of battery cells. Switch unit;
    를 포함하는 배터리 셀 밸런싱 장치.Battery cell balancing device comprising a.
  3. 제2항에 있어서, 상기 배터리 모듈은 The method of claim 2, wherein the battery module
    상기 복수의 배터리 셀 각각의 충전량을 모니터링하고, 제1 기준량 이상 충전된 배터리 셀을 상기 과충전 셀로 설정하고, 제2 기준량 미만으로 충전된 배터리 셀을 상기 부족 충전 셀로 설정하는 검출기;A detector configured to monitor a charge amount of each of the plurality of battery cells, set a battery cell charged above a first reference amount as the overcharge cell, and set a battery cell charged below a second reference amount as the undercharge cell;
    를 더 포함하고,More,
    상기 제1 기준량은 상기 제2 기준량과 같거나 그보다 큰 배터리 셀 밸런싱 장치.And the first reference amount is equal to or greater than the second reference amount.
  4. 제3항에 있어서, 상기 밸런싱 모듈은The method of claim 3, wherein the balancing module
    상기 검출기의 출력을 기초로 상기 적어도 하나의 과충전 셀 및 상기 적어도 하나의 부족 축전 셀을 결정하고, 상기 적어도 하나의 과충전 셀을 상기 직류-직류 변환기의 입력단에 연결하고 상기 적어도 하나의 부족 충전 셀을 상기 직류-직류 변환기의 출력단에 연결하도록 상기 스위치부의 동작을 제어하는 제어기; Determine the at least one overcharge cell and the at least one undercharge cell based on the output of the detector, connect the at least one overcharge cell to an input of the DC-DC converter and connect the at least one undercharge cell A controller controlling the operation of the switch unit to be connected to an output terminal of the DC-DC converter;
    를 더 포함하는 배터리 셀 밸런싱 장치.Battery cell balancing device further comprising.
  5. 제2항에 있어서, 상기 스위치부는The method of claim 2, wherein the switch unit
    상기 복수의 배터리 셀의 양단 및 상기 직류-직류 변환기의 입력단에 연결되는 복수의 방전 스위치를 포함하는 방전 스위치부; 및A discharge switch unit including a plurality of discharge switches connected to both ends of the plurality of battery cells and input terminals of the DC-DC converter; And
    상기 복수의 배터리 셀의 상기 양단 및 상기 직류-직류 변환기의 출력단에 연결되는 복수의 충전 스위치를 포함하는 충전 스위치부;A charge switch unit including a plurality of charge switches connected to both ends of the plurality of battery cells and output terminals of the DC-DC converter;
    를 포함하는 배터리 셀 밸런싱 장치. Battery cell balancing device comprising a.
  6. 제5항에 있어서, 상기 복수의 방전 스위치는The method of claim 5, wherein the plurality of discharge switches
    상기 복수의 충전 스위치에 각각 대응하며 서로 직렬 연결되는 배터리 셀 밸런싱 장치.Battery cell balancing device corresponding to each of said plurality of charge switch and connected in series.
  7. 제6항에 있어서, 상기 복수의 방전 스위치의 스위칭 상태는The method of claim 6, wherein the switching state of the plurality of discharge switches
    상기 복수의 충전 스위치의 스위칭 상태에 서로 대응하지 않는 배터리 셀 밸런싱 장치.Battery cell balancing device that does not correspond to each other switching state of the plurality of charge switch.
  8. 제2항에 있어서, 상기 복수의 배터리 셀은The method of claim 2, wherein the plurality of battery cells
    상기 스위치부를 통하여 서로 병렬 연결되는 배터리 셀 밸런싱 장치.Battery cell balancing device connected in parallel to each other through the switch.
  9. 제4항에 있어서, 상기 제어기는The method of claim 4, wherein the controller
    상기 과충전 셀이 복수개이고 상기 부족 충전 셀이 복수개 이면, 상기 복수개의 과충전 셀이 모두 상기 직류-직류 변환기의 입력단에 연결되고 상기 복수개의 부족 충전 셀이 모두 상기 직류-직류 변환기의 출력단에 연결되도록 상기 스위치부의 동작을 제어하는 배터리 셀 밸런싱 장치.When there are a plurality of overcharge cells and a plurality of undercharge cells, the plurality of overcharge cells are all connected to an input terminal of the DC-DC converter and the plurality of undercharge cells are all connected to an output terminal of the DC-DC converter. Battery cell balancing device for controlling the operation of the switch unit.
  10. M개의 배터리 셀을 포함하는 배터리 모듈; A battery module including M battery cells;
    N개의 직류-직류 변환기; 및N DC-DC converters; And
    상기 M개의 배터리 셀 각각의 충전량에 따라, 적어도 하나의 과충전 셀을 상기 N개의 직류-직류 변환기 중 어느 하나의 입력단에 연결하고, 적어도 하나의 부족 충전 셀을 상기 N개의 직류-직류 변환기 중 어느 하나의 출력단에 연결하도록 스위칭 동작하는 스위치부; According to the charge amount of each of the M battery cells, at least one overcharge cell is connected to the input terminal of any one of the N DC-DC converter, and at least one undercharge cell is any one of the N DC-DC converter A switch unit for switching to connect to an output terminal of the switch unit;
    를 포함하고,Including,
    상기 M 및 N은 자연수로서 수식 M>N 을 만족하는 배터리 셀 밸런싱 장치.Wherein M and N is a natural number battery cell balancing device that satisfies the formula M> N.
PCT/KR2016/013632 2016-10-31 2016-11-24 Battery cell balancing device WO2018079918A1 (en)

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