KR20080013136A - Method and apparatus of balancing cell in battery pack of hev - Google Patents

Method and apparatus of balancing cell in battery pack of hev Download PDF

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KR20080013136A
KR20080013136A KR1020060074252A KR20060074252A KR20080013136A KR 20080013136 A KR20080013136 A KR 20080013136A KR 1020060074252 A KR1020060074252 A KR 1020060074252A KR 20060074252 A KR20060074252 A KR 20060074252A KR 20080013136 A KR20080013136 A KR 20080013136A
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current
balancing
temperature
battery pack
battery
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KR101073277B1 (en
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김도연
조일
정도양
김주영
정창기
박정민
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주식회사 엘지화학
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • B60L58/22—Balancing the charge of battery modules
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/545—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/547—Voltage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/549—Current
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/90—Vehicles comprising electric prime movers
    • B60Y2200/91—Electric vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2400/00—Special features of vehicle units
    • B60Y2400/30—Sensors
    • B60Y2400/302—Temperature sensors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2400/00—Special features of vehicle units
    • B60Y2400/30—Sensors
    • B60Y2400/308—Electric sensors
    • B60Y2400/3084—Electric currents sensors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2400/00—Special features of vehicle units
    • B60Y2400/30—Sensors
    • B60Y2400/308—Electric sensors
    • B60Y2400/3086—Electric voltages sensors
    • 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
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

A method and an apparatus for balancing cells of a battery pack in hybrid electric vehicles are provided to prevent imbalance in the battery pack by performing the cell balancing in view of a voltage deviation of battery cells and a balancing allowable current during traveling. A temperature, an electric current and a voltage variation are measured(S210), and then it is judged whether the voltage variation is deviated from a predetermined range(S220). If the voltage variation is deviated from the range, it is judged whether the measured electric current is deviated from a balancing allowable current range previously stored, so as to correspond to the measured temperature(S230). If the electric current is deviated from the balancing allowable current range, cell balancing is performed(S240).

Description

하이브리드 전기 자동차용 배터리 팩의 셀 밸런싱 방법 및 이를 위한 장치{METHOD AND APPARATUS OF BALANCING CELL IN BATTERY PACK OF HEV}Cell balancing method for a battery pack for a hybrid electric vehicle and apparatus therefor {METHOD AND APPARATUS OF BALANCING CELL IN BATTERY PACK OF HEV}

도 1은 배터리 셀 등의 내부 저항 편차에 따른 배터리 팩의 불균형을 나타낸 도면,1 is a view showing an unbalance of a battery pack according to an internal resistance variation of a battery cell, etc.

도 2는 본 발명의 일실시예에 따른 배터리 관리 시스템의 블록 구성도를 나타낸 도면,2 is a block diagram of a battery management system according to an embodiment of the present invention;

도 3은 본 발명에 따른 셀 밸런싱의 수행을 위한 제어 흐름을 나타낸 도면,3 is a diagram illustrating a control flow for performing cell balancing according to the present invention;

도 4는 본 발명에 따른 온도와 전류에 따른 셀 밸런싱 수행 여부를 판단하는 제어 흐름을 나타낸 도면.4 is a diagram illustrating a control flow for determining whether to perform cell balancing according to temperature and current according to the present invention.

본 발명은 하이브리드 전기 자동차용 배터리 팩의 셀 밸런싱 방법 및 이를 위한 장치에 관한 것이다.The present invention relates to a cell balancing method of a battery pack for a hybrid electric vehicle and an apparatus therefor.

최근 하이브리드 자동차(HEV; Hybrid Electric Vehicles)가 주목받고 있다. 이 하이브리드 자동차는 필요 전력을 공급받기 위해 다수개의 배터리 셀로 구성된 배터리 팩을 탑재한다. 이러한 배터리 팩에 포함되어 있는 다수개의 배터리 셀은 안전성과 수명 향상, 그리고 고출력을 얻기 위해 각 배터리 셀의 전압을 균일하게 해줄 필요가 있다. 배터리 관리 장치는 배터리 팩의 배터리들을 충전 또는 방전하면서 각 배터리가 적절한 전압을 가질 수 있게 한다. 하지만 다수개의 배터리 셀들은 내부 임피던스의 변화 등의 여러 요인에 의해 평형 상태를 안정적으로 유지하기가 어려워 배터리 관리 시스템에서는 다수의 배터리 셀들의 충전 상태를 평형화시키기 위한 밸런싱 기능을 가진다. Recently, hybrid electric vehicles (HEV) have attracted attention. The hybrid car is equipped with a battery pack consisting of multiple battery cells to supply the required power. The multiple battery cells included in these battery packs need to equalize the voltage of each battery cell in order to improve safety, lifespan, and high power. The battery management device allows each battery to have an appropriate voltage while charging or discharging the batteries of the battery pack. However, since a plurality of battery cells are difficult to maintain a stable state due to various factors such as a change in internal impedance, a battery management system has a balancing function for balancing the state of charge of a plurality of battery cells.

즉, 배터리 팩 내의 배터리 셀들의 자기 방전률의 차이에 의해 시간이 지남에 따라 배터리 팩 내의 배터리 셀들간의 잔존용량(State Of Charge, 이하 SOC라 함)의 차이가 발생하게 된다. 이러한 배터리 셀들간의 용량 불균형(imbalance)을 극복하기 위해 배터리 셀들마다 충전(boost) 및/또는 방전(buck)을 해주기 위해 별도의 회로를 구성하고 있다. That is, over time, a difference in residual capacity (state of charge, hereinafter, SOC) between battery cells in the battery pack may occur due to a difference in self discharge rate of the battery cells in the battery pack. In order to overcome the capacity imbalance between the battery cells, a separate circuit is configured to charge and / or buck each battery cell.

이와 같이, 배터리 셀들의 밸런싱을 위한 종래 기술로는 한국 특허공개 제2006-0011484호가 있다. 이 특허에서는 배터리 팩은 적어도 하나 이상의 베어 셀로 이루어져 소정 전압으로 충,방전가능한 제1뱅크와, 제1뱅크와 직렬로 연결된 동시에, 적어도 하나 이상의 베어 셀로 이루어져 소정 전압으로 충,방전 가능한 제2뱅크와, 직렬로 연결된 제1뱅크 및 제2뱅크에 병렬로 연결된 외부 단자와, 제1뱅크와 외부 단자 사이에 직렬로 연결되어 충방전을 제어하는 스위치와, 제1뱅크의 전압 및 전류를 센싱하여 스위치의 온,오프 상태를 제어하는 제1뱅크 제1제어부와, 제2뱅크의 전압 및 전류를 센싱하여 스위치의 온,오프 상태를 제어하는 제2뱅크 제1제어부와, 제1뱅크 또는 제2뱅크중 선택된 어느 하나와 병렬로 연결되어, 제1뱅크 및 제2뱅크를 경유하는 전류의 소비량이 모두 같아지도록 하는 밸런싱 저항을 포함할 수 있다.As such, there is a Korean Patent Publication No. 2006-0011484 as a prior art for balancing battery cells. In this patent, a battery pack includes at least one bare cell configured to charge and discharge at a predetermined voltage, a first bank connected in series with the first bank, and at least one bare cell configured to charge and discharge at a predetermined voltage; A switch connected in series between the first bank and the second bank connected in series, a switch connected in series between the first bank and the external terminal to control charging and discharging, and sensing the voltage and current of the first bank A first bank for controlling the on and off states of the first bank, a second bank for controlling the on and off states of the switch by sensing voltage and current of the second bank, and a first bank or the second bank It may include a balancing resistor connected in parallel with any one of the selected, so that the consumption of the current through the first bank and the second bank are equal.

또한, 일본 공개특허 평2001-190030호는 복수개의 2차 전지를 직렬로 접속한 조립전지를 제어하는 조립전지 제어 장치에 있어서 상기 복수개의 2차 전지의 각각의 전지 전압을 검출하는 전지 전압 검출 수단과, 상기 복수개의 2차 전지에 각각 병렬로 접속되고 상기 전지 전압 검출 수단에 의해서 검출되는 각 전지 전압과 그 전지 전압의 변화량에 근거하여 2차 전지에 흐르는 전류를 바이패스한 전지 전압 밸런스 회로를 개시한다.Further, Japanese Patent Laid-Open No. 2001-190030 is a battery voltage detecting means for detecting battery voltage of each of the plurality of secondary batteries in an assembled battery control device for controlling an assembled battery in which a plurality of secondary batteries are connected in series. And a battery voltage balance circuit connected to each of the plurality of secondary batteries in parallel and bypassing current flowing through the secondary battery based on each battery voltage detected by the battery voltage detecting means and the amount of change in the battery voltage. It starts.

그러나 이들 종래 기술들은 단지 배터리 셀들의 전류 또는 전압간의 차이를 측정하고 그 차이점에 따라 배터리 셀 전압을 밸런싱할 뿐 하이브리드 자동차에서 배터리 팩 내의 배터리 셀들의 내부 저항 편차를 고려하지 않음으로써, 배터리 셀등의 내부 저항 편차에 따른 배터리 팩의 불균형을 나타낸 도 1에 도시된 바와 같이 오히려 배터리 팩의 불균형을 야기할 수 있다. However, these conventional techniques merely measure the difference between the current or voltage of the battery cells and balance the battery cell voltage according to the difference, and do not take into account the internal resistance variation of the battery cells in the battery pack in a hybrid vehicle, thereby preventing the internals of the battery cells, etc. Rather, as shown in FIG. 1, which shows an imbalance of the battery pack according to the resistance variation, it may cause an imbalance of the battery pack.

따라서, 본 발명은 전술한 종래 기술의 문제점을 해결하기 위하여 제안된 것으로서, 그 목적은 하이브리드 전기 차량의 주행중에도 배터리 팩의 셀 밸런싱을 할 수 있도록 배터리 팩 내의 셀들의 내부저항 편차를 감안한 셀 밸런싱을 수행함으로써 배터리 팩을 최적의 상태로 유지하는 하이브리드 전기 자동차용 배터리 팩의 셀 밸런싱 방법 및 이를 위한 장치를 제공하는 것이다. Accordingly, the present invention has been proposed to solve the above-mentioned problems of the prior art, and an object thereof is to provide cell balancing in consideration of the internal resistance variation of cells in the battery pack so that the battery pack can be balanced while the hybrid electric vehicle is running. The present invention provides a cell balancing method and an apparatus therefor for a battery pack for a hybrid electric vehicle that maintains the battery pack in an optimal state.

상술한 목적들을 달성하기 위한 본 발명은 배터리 팩의 셀 밸런싱 방법에 있어서, 온도, 전류, 전압 편차를 측정하는 단계, 상기 전압 편차가 소정 범위를 벗어나는지를 체크하는 단계, 상기 전압 편차가 소정 범위를 벗어나면, 상기 측정된 전류가 상기 측정된 온도에 대응되게 미리 저장된 밸런싱 허용 전류 범위를 벗어나는지를 체크하는 단계, 및 상기 전류가 상기 밸런싱 허용 전류 범위를 벗어나면, 셀 밸런싱을 이행하는 단계를 포함한다.According to an aspect of the present invention, there is provided a cell balancing method of a battery pack, the method including: measuring temperature, current, and voltage deviation; checking whether the voltage deviation is out of a predetermined range; If off, checking whether the measured current is out of a pre-stored balancing allowable current range corresponding to the measured temperature, and if the current is out of the balancing allowable current range, performing cell balancing. .

또한, 본 발명은 배터리 팩의 배터리 관리 장치에 있어서, 상기 배터리 팩의 온도를 측정하여 출력하는 온도 측정부, 상기 배터리 팩의 셀들의 전류를 측정하여 출력하는 전류 측정부, 상기 배터리 팩의 셀들의 전압을 측정하여 출력하는 전압 측정부, 온도별, SOC별 배터리 셀들의 내부 저항값들과 그 편차 및 밸런싱 허용 전류 범위를 저장하는 메모리, 및 상기 온도 측정부, 전류 측정부 및 전압 측정부로부터 온도, 전류, 및 전압을 제공받고 이로부터 전압 편차를 측정하고 상기 전압 편차가 소정 범위를 벗어나는지를 체크하여 상기 전압 편차가 소정 범위를 벗어나면 상기 측정된 전류가 상기 측정된 온도에 대응되게 미리 저장된 밸런싱 허용 전류 범위를 벗어나는지를 체크하고 상기 전류가 상기 밸런싱 허용 전류 범위를 벗어나면, 셀 밸런싱을 이행하는 제어부를 포함한다.In addition, the present invention provides a battery management device of a battery pack, the temperature measuring unit for measuring the temperature of the battery pack and outputs, the current measuring unit for measuring and outputting the current of the cells of the battery pack, A voltage measuring unit for measuring and outputting a voltage, a memory for storing internal resistance values of the battery cells for each temperature and SOC, a deviation thereof, and a balancing allowable current range, and a temperature from the temperature measuring unit, the current measuring unit, and the voltage measuring unit. A current, voltage, and voltage measured from the measured voltage deviation and checking whether the voltage deviation is out of a predetermined range, and when the voltage deviation is out of a predetermined range, the measured current is stored in advance to correspond to the measured temperature. Check if it is out of the allowable current range and if the current is out of the balancing allowable current range, perform cell balancing. It is a control unit.

이하 본 발명의 바람직한 실시 예들을 첨부한 도면을 참조하여 상세히 설명한다. 또한 본 발명의 요지를 불필요하게 흐릴 수 있는 공지 기능 및 구성에 대한 상세한 설명은 생략한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

본 발명은 배터리 관리 시스템은 배터리 팩 내의 셀들의 내부 저항 편차를 감안하기 위해 백터리 팩 내의 온도별로 밸런싱이 가능한 허용 전류 범위를 미리 설정하고, 주행중에 배터리 셀간의 전압 편차 및 밸런싱 허용 전류를 고려하여 밸 밸런싱을 수행한다.According to the present invention, the battery management system presets an allowable current range that can be balanced for each temperature in the battery pack in order to take into account the internal resistance deviation of the cells in the battery pack, and considers the voltage deviation and the balancing allowable current between the battery cells while driving. Perform balancing.

상기한 바와 같은 기능이 구현된 배터리 관리 시스템의 구성요소 및 그 동작을 도 2를 참조하여 설명한다. 도 2를 본 발명의 일실시예에 따른 배터리 관리 시스템의 블록 구성도를 나타낸다.Components and operations of the battery management system in which the above functions are implemented will be described with reference to FIG. 2. 2 is a block diagram of a battery management system according to an embodiment of the present invention.

도 2를 참조하면, 본 발명의 실시예에 따른 배터리 관리 시스템은 배터리 팩(10), 온도 측정부(20), 전류 측정부(30), 전압 측정부(40), 제어부(50) 및 메모리(60)를 구비한다. 2, a battery management system according to an exemplary embodiment of the present invention includes a battery pack 10, a temperature measuring unit 20, a current measuring unit 30, a voltage measuring unit 40, a controller 50, and a memory. 60 is provided.

메모리(60)는 본 발명에 따라 온도별, SOC별 배터리 셀들의 내부 저항값들 및 그 편차를 저장하고 있다. 전술한 바와 같이 하이브리드 자동차의 주행중에 배터리 셀들의 내부 저항편차를 고려하지 않으면 배터리 팩의 불균형을 초래하므로, 본 발명에서는 미리 온도별, SOC별 배터리 셀들의 내부 저항값들 및 그 편차를 산출하여 메모리(60)에 미리 저장하여 둔 후, 추후 배터리 셀들의 밸런싱을 수행할 때 이용한다. 또한, 본 발명은 온도별 및 SOC별 밸런싱이 가능한 전류 영역, 즉 밸런싱 허용 전류를 미리 설정하여 메모리(60)에 저장하고 있다. The memory 60 stores internal resistance values and deviations of battery cells by temperature and SOC according to the present invention. As described above, if the internal resistance deviation of the battery cells is not taken into consideration while driving the hybrid vehicle, an imbalance of the battery pack is caused. In the present invention, internal resistance values and deviations of the battery cells for each temperature and SOC are calculated in advance and the memory is calculated. It is stored in advance at 60 and used later for balancing the battery cells. In addition, according to the present invention, a current range that can be balanced by temperature and SOC, that is, a balancing allowable current, is set in advance and stored in the memory 60.

그리고 온도 측정부(20)는 배터리 팩의 온도를 측정하여 제어부(50)에 제공하고, 전류 측정부(30)는 배터리 팩의 셀들의 전류를 측정하여 제어부에 제공한다. 전압 측정부(40)는 배터리 팩의 셀들의 전압을 측정하여 제어부에 제공한다.The temperature measuring unit 20 measures the temperature of the battery pack and provides it to the controller 50, and the current measuring unit 30 measures the current of the cells of the battery pack and provides it to the controller. The voltage measuring unit 40 measures the voltage of the cells of the battery pack and provides it to the controller.

제어부(50)는 하이브리드 전기 자동차의 주행중 온도 측정부(20), 전류 측정 부(30) 및 전압 측정부(40)로부터 온도, 전류, 및 전압을 제공받는다. 그리고, 제어부(50)는 전압 편차가 목표 전압 편차보다 큰지를 판단한다. 이때, 전압 편차가 목표 전압 편차보다 크지 않으면 제어부(50)는 셀 밸런싱을 종료한다.The controller 50 receives temperature, current, and voltage from the temperature measuring unit 20, the current measuring unit 30, and the voltage measuring unit 40 while driving the hybrid electric vehicle. The controller 50 determines whether the voltage deviation is greater than the target voltage deviation. At this time, if the voltage deviation is not greater than the target voltage deviation, the controller 50 ends cell balancing.

만약, 전압 편차가 목표 전압 편차보다 크면 제어부(50)는 현재의 온도에서 전류가 밸런싱 허용 전류 이하인지를 판단하거나, 전류가 밸런싱이 가능한 허용 전류 범위를 벗어나는 지를 판단한다.If the voltage deviation is greater than the target voltage deviation, the controller 50 determines whether the current is equal to or less than the allowable balancing current at the current temperature, or determines whether the current is out of the allowable current range for balancing.

만약 전류가 밸런싱 허용 전류 이하이거나 밸런싱이 가능한 허용 전류 범위를 벗어나면 제어부(50)는 셀 밸런싱을 수행한다.If the current is less than the allowable balancing current or out of the allowable current range for balancing, the controller 50 performs cell balancing.

이하, 이와 같이 구성된 배터리 관리 시스템에서 셀 밸런싱의 수행을 위한 제어 흐름을 도 3을 참조하여 설명한다. Hereinafter, a control flow for performing cell balancing in the battery management system configured as described above will be described with reference to FIG. 3.

도 3은 본 발명에 따른 셀 밸런싱의 수행을 위한 제어 흐름을 나타낸다. 도 2 및 도 3을 참조하면, 먼저 배터리 관리 시스템은 단계 S210에서 배터리의 온도, 배터리의 전류, 및 배터리의 전압 편차를 측정한다. 이어서 배터리 관리 시스템은 단계 220로 진행하여 측정한 전압 편차가 목표 전압 편차보다 큰지를 판단한다. 이때, 전압 편차가 목표 전압 편차보다 크지 않으면 배터리 관리 시스템은 셀 밸런싱을 종료한다.3 shows a control flow for performing cell balancing according to the present invention. 2 and 3, the battery management system first measures the temperature of the battery, the current of the battery, and the voltage deviation of the battery in step S210. The battery management system then proceeds to step 220 and determines whether the measured voltage deviation is greater than the target voltage deviation. At this time, if the voltage deviation is not greater than the target voltage deviation, the battery management system terminates cell balancing.

만약, 전압 편차가 목표 전압 편차보다 크면 배터리 관리 시스템은 단계 230에서 현재의 온도에서 전류가 밸런싱 허용 전류 이하인지를 판단한다. 이때 배터리 관리 시스템은 메모리(60)에 저장된 온도별 SOC별 밸런싱 허용 전류를 독출하여 이용한다. 만약 전류가 밸런싱 허용 전류 이하이면 배터리 관리 시스템은 단계 240으 로 진행하여 셀 밸런싱을 수행한다.If the voltage deviation is greater than the target voltage deviation, the battery management system determines in step 230 whether the current is at or below the balancing allowable current at the current temperature. At this time, the battery management system reads and uses a balancing allowance current for each SOC stored in the memory 60. If the current is below the balancing allowable current, the battery management system proceeds to step 240 to perform cell balancing.

도 4는 본 발명에 따른 온도와 전류에 따른 셀 밸런싱 수행 여부를 판단하는 제어 흐름을 나타낸다.4 shows a control flow for determining whether cell balancing is performed according to temperature and current according to the present invention.

도 4를 참조하면, 배터리 관리 시스템은 단계 S301 내지 단계 S305에서 현재의 온도가 각각 소정의 온도 즉, 35도, 25도, 10도, 0도 및 -10도를 초과하는 지를 판단하고, 만약 현재의 온도가 소정의 온도를 초과하면 각각 단계 S311 내지 S315로 진행하여 전류가 소정의 허용 전류 20A, 10A, 8A, 4A, 및 2A 이하인지를 판단한다. 만약 전류가 소정의 허용 전류 이하이면 배터리 관리 시스템은 밸런싱을 수행한다. 그리고, 배터리 관리 시스템은 전류가 소정의 허용 전류를 초과하거나, 단계 S316에서 현재의 온도가 -10도를 초과하지 않고 전류가 소정의 허용 전류 1A보다 작으면 밸런싱을 수행하지 않는다. 여기에서 각 허용 전류들 및 소정의 온도들은 당업자에 의해 변경될 수 있으므로, 본 발명은 이에 한정되지 않는다.Referring to FIG. 4, the battery management system determines whether the current temperature exceeds a predetermined temperature, that is, 35 degrees, 25 degrees, 10 degrees, 0 degrees, and -10 degrees, respectively, in steps S301 to S305. When the temperature exceeds the predetermined temperature, the process proceeds to steps S311 to S315, respectively, to determine whether the current is below the predetermined allowable current 20A, 10A, 8A, 4A, and 2A. If the current is below a predetermined allowable current, the battery management system performs balancing. Then, the battery management system does not perform balancing if the current exceeds the predetermined allowable current or if the current temperature does not exceed −10 degrees in step S316 and the current is smaller than the predetermined allowable current 1A. Here, each of the allowable currents and the predetermined temperatures can be changed by those skilled in the art, so the present invention is not limited thereto.

한편 본 발명의 상세한 설명에서는 구체적인 실시 예에 관해 설명하였으나, 본 발명의 범위에서 벗어나지 않는 한도 내에서 여러 가지 변형이 가능함은 물론이다. 그러므로 본 발명의 범위는 설명된 실시 예에 국한되어 정해져서는 아니되며 후술하는 특허청구 범위뿐만 아니라 이 특허청구의 범위와 균등한 것들에 의해 정해져야 한다.Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below but also by the equivalents of the claims.

종래, 하이브리드 자동차에서 배터리 팩을 주행중에 셀들의 내부저항 편차를 고려하지 않으면 배터리 팩의 불균형을 초래할 수 있다. 그러나 전술한 바와 같은 본 발명에 따르면, 배터리 팩 내의 셀들의 내부 저항 편차를 감안하기 위해 백터리 팩 내의 온도와 SOC에 따라 밸런싱이 가능한 허용 전류 범위를 미리 설정하고, 주행중에 배터리 셀간의 전압 편차 및 밸런싱 허용 전류를 고려하여 밸 밸런싱을 수행함으로써 배터리 팩내의 불균형을 미리 방지할 수 있다.In the related art, when the battery pack is driven in a hybrid vehicle, the variation in the internal resistance of the cells may not be taken into account, resulting in an imbalance of the battery pack. However, according to the present invention as described above, in order to take into account the internal resistance deviation of the cells in the battery pack, the allowable current range that can be balanced according to the temperature and SOC in the battery pack is set in advance, and the voltage deviation between the battery cells and The balancing in the battery pack can be prevented in advance by performing balancing in consideration of the balancing allowable current.

Claims (2)

배터리 팩의 셀 밸런싱 방법에 있어서, In the cell balancing method of the battery pack, 온도, 전류, 전압 편차를 측정하는 단계,Measuring temperature, current, voltage deviation, 상기 전압 편차가 소정 범위를 벗어나는지를 체크하는 단계,Checking whether the voltage deviation is out of a predetermined range, 상기 전압 편차가 소정 범위를 벗어나면, 상기 측정된 전류가 상기 측정된 온도에 대응되게 미리 저장된 밸런싱 허용 전류 범위를 벗어나는지를 체크하는 단계, 및If the voltage deviation is out of a predetermined range, checking whether the measured current is out of a previously stored balancing allowable current corresponding to the measured temperature, and 상기 전류가 상기 밸런싱 허용 전류 범위를 벗어나면, 셀 밸런싱을 이행하는 단계를 포함하는 것을 특징으로 하는 배터리 팩의 셀 밸런싱 방법. And performing cell balancing if the current is outside the balancing allowable current range. 배터리 팩의 배터리 관리 장치에 있어서,In the battery management device of the battery pack, 상기 배터리 팩의 온도를 측정하여 출력하는 온도 측정부,A temperature measuring unit measuring and outputting a temperature of the battery pack; 상기 배터리 팩의 셀들의 전류를 측정하여 출력하는 전류 측정부,A current measuring unit measuring and outputting current of the cells of the battery pack; 상기 배터리 팩의 셀들의 전압을 측정하여 출력하는 전압 측정부,A voltage measuring unit measuring and outputting voltages of cells of the battery pack; 온도별, SOC별 배터리 셀들의 내부 저항값들과 그 편차 및 밸런싱 허용 전류 범위를 저장하는 메모리, 및A memory for storing internal resistance values of the battery cells by temperature and SOC, their deviations, and a balancing allowable current range, and 상기 온도 측정부, 전류 측정부 및 전압 측정부로부터 온도, 전류, 및 전압을 제공받고 이로부터 전압 편차를 측정하고 상기 전압 편차가 소정 범위를 벗어나는지를 체크하여 상기 전압 편차가 소정 범위를 벗어나면 상기 측정된 전류가 상기 측정된 온도에 대응되게 미리 저장된 밸런싱 허용 전류 범위를 벗어나는지를 체크하고 상기 전류가 상기 밸런싱 허용 전류 범위를 벗어나면, 셀 밸런싱을 이행하는 제어부를 포함하는 것을 특징으로 하는 배터리 관리 시스템.When the temperature deviation is out of a predetermined range by receiving temperature, current, and voltage from the temperature measuring part, the current measuring part, and the voltage measuring part and measuring a voltage deviation therefrom and checking whether the voltage deviation is out of a predetermined range, And a controller which checks whether the measured current is out of a pre-stored balancing allowable current range corresponding to the measured temperature, and performs a cell balancing when the current is out of the balancing allowable current range. .
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