KR20010036801A - a device for discharging a lithum ion battery - Google Patents
a device for discharging a lithum ion battery Download PDFInfo
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- KR20010036801A KR20010036801A KR1019990043967A KR19990043967A KR20010036801A KR 20010036801 A KR20010036801 A KR 20010036801A KR 1019990043967 A KR1019990043967 A KR 1019990043967A KR 19990043967 A KR19990043967 A KR 19990043967A KR 20010036801 A KR20010036801 A KR 20010036801A
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- 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
- H01M10/448—End of discharge regulating measures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
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- 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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- 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
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- 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
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
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- 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
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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- 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
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- 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
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- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Materials Engineering (AREA)
- Power Engineering (AREA)
- Protection Of Static Devices (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
Description
본 발명은 리튬이온 전지의 방전장치에 관한 것으로, 특히, 원하는 방전전류를 설정하여 일정 전류로 방전하는 리튬이온 전지의 방전장치에 관한 것이다.The present invention relates to a discharge device of a lithium ion battery, and more particularly, to a discharge device of a lithium ion battery for setting a desired discharge current to discharge at a constant current.
다양한 휴대용 전자장치들이 많은 계층들로부터 호응을 얻어 급속히 보급됨에 따라 전기를 저장하여 전원을 공급할 수 있는 전지의 수요가 급속히 늘고 있다. 특히 방전 후에 다시 충전하여 사용할 수 있는 2차전지는 자원 재활용및 절약의 면에서 유리하기 때문에 환경보호와 관련되어 사용이 늘고 있다.As various portable electronic devices have been popularized by many layers and rapidly spread, the demand for batteries capable of storing and supplying electricity is rapidly increasing. In particular, secondary batteries that can be recharged and used after discharging are advantageous in terms of resource recycling and saving, and thus are increasingly used in connection with environmental protection.
2차전지는 화학에너지를 전기에너지로 변환하는 장치이며, 방전 후에 다시 충전할 수 있다. 2차전지의 대표적인 것으로서 리튬이온 전지는 현재의 휴대용 통신단말기에 널리 사용되고 있다. 리튬 이온전지의 방전전압은 대표적인 경우 4.2V이며, 방전되면서 전압은 계속해서 떨어져 방전 컷오프 전압(예를들면, 2.4V 정도)에서 전지의 특성을 잃게 된다. 그에 따라 리튬이온 전지의 생산시에 충전과 방전을 2내지 3회 실행하여 2차전지로서의 특성을 갖도록 한다. 이와같이 리튬이온 전지를 충전하여 방전하는 경우에 일정전류로 방전하여 방전특성을 검사하게 되고, 전지의 단자전압을 체크하여 전지의 특성을 잃어버리는 컷오프(cut-off) 전압이하로 떨어지지 않도록 방전전압을 계속적으로 감시해야 한다. 또한 방전중에 과전류 방전에 의해 열이 발생하여 폭발하지 않도록 전지의 온도를 감시하여 일정온도가 되면 방전을 중지해야 한다.A secondary battery is a device that converts chemical energy into electrical energy and can be recharged after discharge. As a representative of secondary batteries, lithium ion batteries are widely used in current portable communication terminals. The discharge voltage of a lithium ion battery is typically 4.2V, and as the discharge continues, the voltage continues to drop and loses battery characteristics at the discharge cutoff voltage (eg, about 2.4V). Accordingly, charging and discharging are performed two or three times during the production of the lithium ion battery so as to have characteristics as a secondary battery. Thus, when charging and discharging a lithium ion battery, it is discharged with a constant current to examine the discharge characteristics, and the discharge voltage is adjusted so as not to fall below the cut-off voltage that loses the battery characteristics by checking the terminal voltage of the battery. You need to keep an eye on it. In addition, it is necessary to monitor the temperature of the battery so as not to generate heat due to overcurrent discharge during discharge and to stop the discharge when it reaches a certain temperature.
본 발명은 상기와 같은 문제점을 해결하기 위하여 창안한 것으로,The present invention was made to solve the above problems,
본 발명의 목적은 원하는 방전전류를 설정하여 일정 전류로 방전할 수 있는 리튬이온 전지의 방전장치를 제공하는 것이다.It is an object of the present invention to provide a discharge device of a lithium ion battery capable of setting a desired discharge current to discharge at a constant current.
본 발명의 다른 목적은 방전시에 과열에 의한 폭발이나 열화를 방지하는 리튬이온 전지의 방전장치를 제공하는 것이다.Another object of the present invention is to provide a discharge device of a lithium ion battery which prevents explosion or deterioration due to overheating during discharge.
도 1에 본 발명에 의한 리튬이온 전지의 방전장치의 구성을 나타내는 블록도,1 is a block diagram showing the configuration of a discharge device for a lithium ion battery according to the present invention;
도 2는 도 1의 전류제어부와 전류검출부의 회로도,2 is a circuit diagram of a current control unit and a current detection unit of FIG.
도 3은 컷오프 전압검출부의 회로도,3 is a circuit diagram of a cutoff voltage detector;
도 4는 도 1의 방전장치를 제어하는 방법을 나타내는 플로우차트이다4 is a flowchart illustrating a method of controlling the discharge device of FIG. 1.
〈도면의 주요 부분에 대한 부호의 설명〉<Explanation of symbols for main parts of drawing>
11 : 전압검출부 12 : 온도검출부11: voltage detector 12: temperature detector
13 : 전류검출부 14 : 전류제어부13 current detection unit 14 current control unit
15 : 방전부하 16 : 방전전류설정부15: discharge load 16: discharge current setting unit
17 : 중앙제어부 18 : 전지보호부17: central control unit 18: battery protection unit
19 : 컷오프 전압 검출부 20 : 전지19: cut-off voltage detector 20: battery
위와 같은 목적을 달성하기 위하여 본 발명에 의한 리튬이온 전지의 방전장치는 전지의 단자전압을 검출하는 전압 검출부와; 상기 전압검출부에서 검출된 단자전압이 컷오프 전압 이하인 경우 전지와 방전부하의 연결을 차단하는 방전중지신호를 출력하는 컷오프 전압 검출부와; 방전부하에 흐르는 전류를 검출하는 전류 검출부와; 상기 전지의 온도를 검출하는 온도 검출부와; 상기 전지에서 방전되는 전류를 제어하는 전류제어부와; 상기 전지에서 방전되는 전류를 설정하는 방전전류 설정부와; 사용자가 입력하는 방전전류 값으로 상기 방전전류 설정부가 설정하도록 제어하고, 상기 전압검출부에서 검출된 단자전압이 컷오프 전압이하 이거나 또는 온도검출부에서 검출된 온도가 설정값 이상이면 상기 전지와 방전부하 사이를 차단하는 방전중지 신호를 출력하는 중앙제어부와; 상기 중앙제어부 또는 컷오프 전압검출부에서 방전중지신호를 입력받아 전지와 방전부하 사이를 차단하는 전지보호부로 구성된다.In order to achieve the above object, a discharge device of a lithium ion battery according to the present invention includes a voltage detector for detecting a terminal voltage of a battery; A cutoff voltage detector configured to output a discharge stop signal for interrupting connection between the battery and the discharge load when the terminal voltage detected by the voltage detector is less than or equal to the cutoff voltage; A current detector for detecting a current flowing in the discharge load; A temperature detector for detecting a temperature of the battery; A current control unit controlling a current discharged from the battery; A discharge current setting unit which sets a current discharged from the battery; The discharge current setting unit controls the discharge current setting unit to set the discharge current value input by the user, and when the terminal voltage detected by the voltage detector is lower than the cutoff voltage or the temperature detected by the temperature detector is higher than the set value, A central control unit for outputting a discharge stop signal for blocking; And a battery protection unit which receives the discharge stop signal from the central control unit or the cutoff voltage detector and cuts off the battery and the discharge load.
상기와 같이 구성된 본 발명을 실시예를 들어 첨부된 도면에 의거 상세히 설명한다.An embodiment of the present invention configured as described above will be described in detail with reference to the accompanying drawings.
도 1에 본 발명에 의한 리튬이온 전지의 방전장치의 구성을 나타내는 블록도가 도시된다.1 is a block diagram showing the configuration of a discharge device of a lithium ion battery according to the present invention.
전압검출부(11)는 전지(20)의 단자전압을 검출하여 출력한다. 온도검출부(12)는 전지(20)의 표면에 접촉된 서미스터에 의해 온도를 검출하여 출력한다. 전류검출부(13)는 방전부하(R13)에 인가되는 전압을 증폭률 1의 오차증폭기(U1)로 증폭하여 중앙제어부(17)로 출력함으로써 중앙제어부(17)가 그 전압을 전류에 대응시방켜 전류를 검출하도록 한다. 전류제어부(14)는 방전부하(R13)에 인가되는 전압을 연산증폭기(U2)로 설정전류와 비교하고, 그 오차를 증폭하여 전지(20)와 방전부하(R13) 사이에 연결된 전류제어소자(Q1)를 제어한다. 전류 설정부(16)는 중앙제어부(17)에서 출력되는 설정전류 신호에 따라 전지(20)의 방전전류를 설정한다. 컷오프 전압 검출부(19)는 상기 전압검출부(11)의 검출전압을 컷오프 전압과 비교하여 컷오프 전압보다 작은 경우 방전중지 신호를 출력한다. 전지보호부(20)는 중앙제어부(17) 또는 컷오프 전압 검출부(19)에서 출력되는 방전중지신호에 의해 전지(20)와 방전부하(15)의 연결을 차단한다. 중앙제어부(17)는 사용자가 입력하는 전류값을 상기 전류설정부(16)에 출력하여 전지(20)의 방전전류를 설정하고, 상기 전압검출부(11)에서 검출되는 전지(20)의 단자전압이 컷오프 전압보다 작은 경우 그리고 상기 온도검출부에서 검출된 온도가 설정온도를 넘는 경우에 방전중지 신호를 출력한다.The voltage detector 11 detects and outputs a terminal voltage of the battery 20. The temperature detector 12 detects and outputs a temperature by using a thermistor in contact with the surface of the battery 20. The current detector 13 amplifies the voltage applied to the discharge load R13 by the error amplifier U1 of amplification factor 1 and outputs it to the central controller 17 so that the central controller 17 responds to the current to the current. To be detected. The current control unit 14 compares the voltage applied to the discharge load R13 with the set current using the operational amplifier U2, amplifies the error, and connects the current control element connected between the battery 20 and the discharge load R13 ( Q1) is controlled. The current setting unit 16 sets the discharge current of the battery 20 according to the set current signal output from the central controller 17. The cutoff voltage detector 19 compares the detected voltage of the voltage detector 11 with the cutoff voltage and outputs a discharge stop signal when the cutoff voltage is smaller than the cutoff voltage. The battery protection unit 20 cuts off the connection between the battery 20 and the discharge load 15 by the discharge stop signal output from the central controller 17 or the cutoff voltage detector 19. The central controller 17 outputs a current value input by the user to the current setting unit 16 to set the discharge current of the battery 20, and the terminal voltage of the battery 20 detected by the voltage detector 11. The discharge stop signal is output when the temperature is smaller than this cutoff voltage and when the temperature detected by the temperature detection unit exceeds the set temperature.
도 2에 도 1의 전류제어부와 전류검출부의 회로도가 도시된다.2 is a circuit diagram of the current control unit and the current detection unit of FIG. 1.
전지의 +단자(CELL 0+)가 전지보호부(20)의 릴레이(RY1)를 통하여 전류제어부(14)의 전류제어소자(Q1)에 연결된다. 전류제어소자(Q1)의 소오스에는 방전부하(R13)가 연결되어 전지(20)에서 공급되는 전류가 그라운드로 흐르게 된다. 방전부하(R13)에 인가되는 전압은 저항(R10)을 통해 오차증폭기(U2)의 반전단자(-)에 입력되고, 설정전류(SET_CURR)는 비반전단자(+)에 인가된다. 비반전단자(+)에 입력되는 기준전압은 방전부하(R13)에 원하는 방전전류를 곱한 값이 되도록 저항(R15, R16, R17)과 가변저항(VR4)을 정한다. 즉, 방전부하(13)에 1A의 전류를 흘려서 방전하고자 할 때, 방전부하(R13)의 저항값 0.1Ω이므로, 0.1V의 전압이 비반전단자(+)에 인가되게 한다. 전류제어소자(Q1)가 스위칭되어 전류가 방전부하(R13)에 흐르면 그 전류와 방전부하(R13)의 저항값의 곱에 해당하는 전압이 저항(R10)을 통해 오차증폭기(U2)의 반전단자(-)에 인가되어 비반전단자(+)에 인가된 기준전압과 비교되고, 그 오차전압이 증폭되어 출력된다. 초기에 전류제어소자(Q1)를 통과하는 전류가 0 A 이라면, 방전부하(R13)에 인가되는 전압은 0 V가 되고, 오차증폭기(U2)의 반전단자(-)에 0 V가 인가되어 그 출력은 포화전압(예를들면, 12V)이 된다. 이 출력은 저항(R9)를 거쳐 전류제어소자(Q1)의 게이트에 인가되어 드레인과 소오스에 전류를 흐르게 한다. 드레인과 소오스 사이에 흐르는 전류는 게이트에 걸리는 전압에 비례하므로 오차증폭기(U2)의 포화전압에 의해 전류제어소자(Q1)는 큰 전류(예를들면, 2 A)를 흐르게 한다. 이 큰 전류에 의해 방전부하(R13)에 전압(예를들어, 2 A가 흐를 때, 0.2V)이 걸리게 된다.The + terminal CELL 0+ of the battery is connected to the current control element Q1 of the current control unit 14 through the relay RY1 of the battery protection unit 20. The discharge load R13 is connected to the source of the current control element Q1 so that the current supplied from the battery 20 flows to the ground. The voltage applied to the discharge load R13 is input to the inverting terminal (−) of the error amplifier U2 through the resistor R10, and the set current SET_CURR is applied to the non-inverting terminal (+). The resistors R15, R16, and R17 and the variable resistor VR4 are determined such that the reference voltage input to the non-inverting terminal + is a value obtained by multiplying the discharge load R13 by a desired discharge current. That is, when a current of 1 A flows through the discharge load 13, the resistance value of the discharge load R13 is 0.1 Ω, so that a voltage of 0.1 V is applied to the non-inverting terminal (+). When the current control element Q1 is switched and a current flows in the discharge load R13, a voltage corresponding to the product of the current and the resistance value of the discharge load R13 is the inverting terminal of the error amplifier U2 through the resistor R10. It is compared with the reference voltage applied to (-) and applied to the non-inverting terminal (+), and the error voltage is amplified and output. If the current passing through the current control element Q1 is 0 A initially, the voltage applied to the discharge load R13 becomes 0 V, and 0 V is applied to the inverting terminal (-) of the error amplifier U2. The output will be a saturation voltage (eg 12V). This output is applied to the gate of the current control element Q1 via a resistor R9 to allow current to flow through the drain and the source. Since the current flowing between the drain and the source is proportional to the voltage applied to the gate, the current control element Q1 causes a large current (for example, 2A) to flow due to the saturation voltage of the error amplifier U2. This large current causes a voltage (for example, 0.2 V when 2 A flows) to the discharge load R13.
오차증폭기(U2)의 비반전단자(+)에는 방전부하(R13)에 원하는 방전전류(예를들면, 1A)를 곱한 값에 해당하는 전압(예를들면, 0.1 V)이 방전전류 설정부(16)에 의해 설정되어 있으므로, 비반전단자(+)에 인가된 전압이 반전단자(-)에 인가된 전압보다 작아서 오차증폭기(2)는 - 전압을 전류제어소자(Q1)의 게이트로 출력한다. 전류제어소자(Q1)의 게이트에 - 전압이 걸리면, 전류를 적게 통과시켜 방전부하(R13)에 걸리는 전압은 감소하게 된다. 이러한 동작의 반복으로 전류제어소자(Q1)를 통과하는 전류는 원하는 방전전류(예를들면, 1A)로 일정하게 된다.The non-inverting terminal (+) of the error amplifier U2 has a voltage (for example, 0.1 V) corresponding to a value obtained by multiplying the discharge load R13 by a desired discharge current (for example, 1A). 16), the voltage applied to the non-inverting terminal (+) is smaller than the voltage applied to the inverting terminal (-) so that the error amplifier 2 outputs the negative voltage to the gate of the current control element Q1. . When a negative voltage is applied to the gate of the current control element Q1, a small amount of current is passed to decrease the voltage applied to the discharge load R13. By repeating this operation, the current passing through the current control element Q1 is made constant at a desired discharge current (for example, 1A).
제너다이오드(ZD3)는 전류제어소자(Q1)의 게이트와 그라운드 사이에 역방향으로 연결되어 오차증폭기(U2)의 출력을 일정전압(예를들면, 4.3V)으로 제한함으로써, 전류제어소자(Q1)에 흐르는 전류가 일정값 이상 흘러 방전전지가 완전 방전되는 것을 방지한다.Zener diode ZD3 is connected in reverse direction between the gate and ground of current control element Q1 to limit the output of error amplifier U2 to a constant voltage (e.g., 4.3V), thereby controlling current control element Q1. The current flowing in the battery flows over a certain value to prevent the discharge battery from being completely discharged.
본 발명의 방전장치에 사용되는 저항 중에 가변저항기들(VR2, VR3, VR4)을 사용한 이유는 저항은 양산과정에서 약간의 오차를 가지므로, 이 저항값의 오차를 보상하기 위해 미소전압 검출용 연산증폭기의 이득 조정단을 가변저항으로 구성하여 저항오차에서 발생하는 전류검출 오차를 없애려는 것이다.The reason why the variable resistors VR2, VR3, and VR4 are used among the resistors used in the discharge device of the present invention is that the resistance has a slight error in the mass production process, so that the operation for detecting the minute voltage to compensate for the error of the resistance value is performed. The gain control stage of the amplifier is composed of variable resistors to eliminate current detection errors caused by resistance errors.
이와 같이 정전류 방전을 하는 동안, 전지(20)의 단자전압은 계속 하강하게 된다. 전지의 단자전압이 어느 한도 이하로 떨어지면 리튬 이온전지의 특성상 충전이 되지 않고 일차전지처럼 다시 사용할 수 없게 된다. 따라서, 전지(20)의 단자전압이 전압검출부(11)에 의해 검출되어 중앙제어부(17)에 입력되고, 중앙제어부(17)는 방전전압을 사전에 설정된 컷오프 전압과 비교하여 컷오프 전압보다 낮아지는 경우, 방전 중지신호(COMP)를 전지보호부(18)에 출력한다. 전지보호부(18)는 방전중지신호를 받아 릴레이(RLY1)를 동작시켜 전지(20)와 방전부하(R13) 사이를 차단한다.In this manner, during the constant current discharge, the terminal voltage of the battery 20 continues to drop. When the terminal voltage of the battery falls below a certain limit, the lithium ion battery is not charged and cannot be used again like a primary battery. Accordingly, the terminal voltage of the battery 20 is detected by the voltage detector 11 and input to the central controller 17, and the central controller 17 is lower than the cutoff voltage by comparing the discharge voltage with a preset cutoff voltage. In this case, the discharge stop signal COMP is output to the battery protection unit 18. The battery protection unit 18 receives the discharge stop signal to operate the relay RLY1 to cut off between the battery 20 and the discharge load R13.
전압검출부(11)에서 검출된 전지(20)의 방전전압(OUT_VOLT)은 컷오프 전압검출부(19)에서 컷오프(cut-off) 전압(예를들면, 2.4 V)과 비교된다. 도 3에 컷오프 전압검출부의 회로도가 도시된다. 컷오프전압은 제너다이오드(ZD1)에 의해 설정되어 비교기(U31)의 비반전단자(+)에 인가되고, 전지(20)의 단자전압(OUT_VOLT)은 반전단자(-)에 인가된다. 전지(20)의 단자전압(OUT_VOLT)이 설정된 방전 컷오프 전압보다 낮게 되면, 비반전단자(+)의 전압이 반전단자(-)의 전압보다 더 크게되므로, 비교기(U31)는 + 전압을 출력하여 릴레이(RY1)가 동작하지 못하도록 하여 전지(20)와 방전부하(R13)을 차단한다. 따라서, 전지(20)의 단자전압이 컷오프 전압이하로 떨어지면 방전이 중단되어 과방전으로 인한 전지의 손상을 방지한다.The discharge voltage OUT_VOLT of the battery 20 detected by the voltage detector 11 is compared with the cut-off voltage (for example, 2.4 V) in the cutoff voltage detector 19. 3 shows a circuit diagram of a cutoff voltage detector. The cutoff voltage is set by the zener diode ZD1 and applied to the non-inverting terminal + of the comparator U31, and the terminal voltage OUT_VOLT of the battery 20 is applied to the inverting terminal −. When the terminal voltage OUT_VOLT of the battery 20 is lower than the set discharge cutoff voltage, the voltage of the non-inverting terminal (+) is greater than that of the inverting terminal (-), so that the comparator U31 outputs a + voltage. The relay RY1 is prevented from operating so that the battery 20 and the discharge load R13 are cut off. Therefore, when the terminal voltage of the battery 20 falls below the cutoff voltage, the discharge is stopped to prevent damage to the battery due to overdischarge.
도 4에 도 1의 방전장치를 제어하는 방법을 나타내는 플로우차트가 도시된다.4 is a flowchart showing a method of controlling the discharge device of FIG. 1.
단계 41에서, 각종 파라메터를 초기화하고, 사용자가 입력하는 방전전류를 전류설정부(16)에 출력하여 전지(20)에서 방전될 방전전류를 설정한다. 단계 S42에서, 전압검출부(11)에서 입력되는 방전전지(22)의 검출전압이 컷오프전압보다 작은지를 판단한다. 검출전압이 컷오프 전압보다 큰 경우, 단계 S43에서 전지의 검출온도가 설정온도보다 큰지를 판단한가, 크지 않은 경우, 상기 검출전압이 컷오프전압보다 작은지를 판단하는 단계 이하의 과정을 반복한다. 상기 단계에서 검출전압이 컷오프 전압보다 작거나 또는 검출온도가 설정온도보다 작지 않은 경우, 단계 S44에서 전지보호부(18)로 방전중지신호를 출력하여 전지와 방전부하의 연결을 차단한다.In step 41, various parameters are initialized and the discharge current input by the user is output to the current setting unit 16 to set the discharge current to be discharged in the battery 20. In step S42, it is determined whether the detected voltage of the discharge battery 22 input from the voltage detector 11 is smaller than the cutoff voltage. If the detected voltage is greater than the cutoff voltage, it is determined whether the detected temperature of the battery is greater than the set temperature in step S43 or if not, the process of determining whether the detected voltage is less than the cutoff voltage is repeated. If the detection voltage is less than the cutoff voltage or the detection temperature is not less than the set temperature in the step, the discharge stop signal is output to the battery protection unit 18 in step S44 to cut off the connection between the battery and the discharge load.
이상에서 살펴본 바와 같이, 본 발명에 의하면, 방전부하에 인가되는 전압을 설정전류에 대응하는 전압과 비교하고, 그 비교결과에 따라 전류제어소자를 제어함으로써, 방전전류를 설정하여 일정 전류로 방전할 수 있고, 전지의 단자전압이 컷오프 전압에 도달하면 자동으로 전류를 차단하여 전지의 손상을 방지할 수 있다.As described above, according to the present invention, by comparing the voltage applied to the discharge load with the voltage corresponding to the set current, and controlling the current control element according to the comparison result, the discharge current is set to discharge at a constant current When the terminal voltage of the battery reaches the cutoff voltage, current can be automatically cut off to prevent damage to the battery.
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| KR100473908B1 (en) * | 2002-08-06 | 2005-03-10 | 주식회사 파워로직스 | Protecting System for Battery |
| KR100657344B1 (en) * | 2005-11-18 | 2006-12-14 | 삼성전자주식회사 | Method and apparatus for controlling battery cut-off according to system load |
| US7719237B2 (en) | 2004-10-13 | 2010-05-18 | Lg Electronics Inc. | Wireless communication terminal and battery pack for the same |
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| KR100473908B1 (en) * | 2002-08-06 | 2005-03-10 | 주식회사 파워로직스 | Protecting System for Battery |
| US7719237B2 (en) | 2004-10-13 | 2010-05-18 | Lg Electronics Inc. | Wireless communication terminal and battery pack for the same |
| KR100657344B1 (en) * | 2005-11-18 | 2006-12-14 | 삼성전자주식회사 | Method and apparatus for controlling battery cut-off according to system load |
| US8283893B2 (en) | 2009-02-05 | 2012-10-09 | Samsung Sdi Co., Ltd. | Protection circuit for battery pack and battery pack including the same |
| US8786258B2 (en) | 2010-03-29 | 2014-07-22 | Samsung Sdi Co., Ltd. | Battery pack and method of controlling the battery pack |
| CN103730700A (en) * | 2013-11-08 | 2014-04-16 | 天津力神电池股份有限公司 | Determining and treating methods of power cell system for sampling harness faults |
| CN103730700B (en) * | 2013-11-08 | 2016-02-24 | 天津力神电池股份有限公司 | A kind of electrokinetic cell system is to the judgement of sampling wire harness fault and processing method |
| CN105305524A (en) * | 2014-07-11 | 2016-02-03 | 新德科技股份有限公司 | Automatic discharge cut-off voltage point regulating circuit of battery management integrated circuit |
| CN105305524B (en) * | 2014-07-11 | 2018-02-09 | 新德科技股份有限公司 | Automatic discharge cut-off voltage point regulating circuit of battery management integrated circuit |
| KR102049164B1 (en) * | 2017-11-17 | 2019-11-26 | 콴타 컴퓨터 인코포레이티드 | Power management circuit |
| US10523022B2 (en) | 2017-11-17 | 2019-12-31 | Quanta Computer Inc. | Power management circuit for dynamically cut-off voltage of battery |
| WO2023113568A1 (en) * | 2021-12-17 | 2023-06-22 | 포스코홀딩스 주식회사 | Discharge method of battery |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100349723B1 (en) | 2002-08-22 |
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