KR20010065381A - The device for detecting temperature of litum-ion battery - Google Patents

The device for detecting temperature of litum-ion battery Download PDF

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Publication number
KR20010065381A
KR20010065381A KR1019990065258A KR19990065258A KR20010065381A KR 20010065381 A KR20010065381 A KR 20010065381A KR 1019990065258 A KR1019990065258 A KR 1019990065258A KR 19990065258 A KR19990065258 A KR 19990065258A KR 20010065381 A KR20010065381 A KR 20010065381A
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South Korea
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temperature
resistor
resistance
comparator
ion battery
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KR1019990065258A
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Korean (ko)
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김병렬
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송재인
엘지이노텍(주)
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Publication of KR20010065381A publication Critical patent/KR20010065381A/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01KMEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/16Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
    • G01K7/18Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
    • G01K7/183Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer characterised by the use of the resistive element
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01KMEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/16Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
    • G01K7/22Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
    • G01K7/24Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor in a specially-adapted circuit, e.g. bridge circuit
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16504Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the components employed
    • G01R19/16523Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the components employed using diodes, e.g. Zener diodes

Abstract

PURPOSE: A device for sensing a temperature of a lithium-ion battery is provided to simply measure a temperature of a rechargeable battery by measuring the temperature of a temperature sensor with a plurality of comparators, thereby preventing the explosion or inferior charging of the lithium-ion battery. CONSTITUTION: A device for sensing a temperature of a lithium-ion battery includes a Zener diode(D1) for outputting a predetermined input voltage(Vin) from an input power source(Vcc), a temperature sensing resistance(NTC) for sensing an internal temperature of a lithium-ion battery, a first comparator(10) for comparing an input signal received via a negative terminal from the temperature sensing resistance with the input voltage received via a positive terminal, a second comparator(20) for comparing a signal input from the temperature sensing resistance received via a positive terminal with the input voltage received via a negative terminal, an output terminal(30) connected to outputs of the comparators, a resistance(R1) inserted between the Zener diode and the power source, a third resistance(R3) connected between the Zener diode and the temperature sensing resistance, a resistance(R4) connected to the temperature sensing resistance in parallel, a fifth resistance(R5) connected between the positive terminal of the first comparator and the third resistance, a seventh resistance(R7) connected to a negative terminal of the second comparator, and a resistance(R6) connected between the fifth and seventh resistances.

Description

리튬-이온 배터리의 온도감지장치{The device for detecting temperature of litum-ion battery}The device for detecting temperature of litum-ion battery

본 발명은 리튬-이온 배터리의 온도감지장치에 관한 것으로서, 더욱 구체적으로는 다수의 비교기를 이용하여 온도감지센서의 온도를 측정, 비교하여 충전이 허용되는 배터리의 온도를 간단하게 측정할 수 있으며, 충전기와 같은 장치에 적용되는 온도감지장치에 관한 것이다.The present invention relates to a temperature sensing device of a lithium-ion battery, and more specifically, it is possible to simply measure the temperature of the battery that is allowed to charge by measuring and comparing the temperature of the temperature sensing sensor using a plurality of comparators, A temperature sensing device applied to a device such as a charger.

리튬-이온(Li-ion) 배터리는 충전시에 주변의 온도에 따라서 폭발가능성이 있기 때문에 배터리규격에 의하여 온도의 상한값과 하한값이 설정되고 이 범위내에서 작동되도록 제한된다.Because lithium-ion (Li-ion) batteries may explode depending on the ambient temperature at the time of charging, the battery specification sets the upper and lower limits of the temperature and limits them to operate within this range.

이러한 안전상의 규정때문에 종래 사용되는 리튬-이온 배터리 온도감지회로는 온도감지등을 위하여 회로가 복잡해지고 구현에 어려움이 있었다. 따라서 보다 간단하면서도 신뢰성있는 리튬-이온 배터리의 온도감지장치가 요구되는 형편인 것이다.Due to such safety regulations, conventionally used lithium-ion battery temperature sensing circuits have complicated circuits for temperature sensing and have difficulty in implementation. Therefore, a simpler and more reliable temperature sensing device for lithium-ion batteries is required.

본 발명은 상기와 같은 문제점을 해결하기 위하여 안출된 것으로서, 본 발명의 목적은 다수의 비교기를 이용하여 온도감지센서의 온도를 측정, 비교하여 충전이 허용되는 배터리의 온도를 간단하게 측정할 수 있으며, 또한 충전기에도 적용될 수 있는 온도감지장치를 제공하는데 있다.The present invention has been made to solve the above problems, an object of the present invention is to measure the temperature of the temperature sensor by using a plurality of comparators, to compare the temperature of the battery that can be charged simply by charging The present invention also provides a temperature sensing device that can be applied to a charger.

상기 목적을 달성하기 위한 본 발명의 리튬-이온 배터리의 온도감지장치는, 입력되는 전원(Vcc)을 소정의 입력전압(Vin)으로 출력하는 제너다이오드(D1)와, 리튬-이온 배터리의 내부 온도를 감지하기 위한 NTC와, 상기 NTC로부터 입력되는 신호를 (-)단자로 입력받고 입력전압(Vin)을 (+)단자로 입력받아서 비교하는 제1비교기(10)와, 상기 NTC로부터 입력되는 신호를 (+)단자로 입력받고 입력전압(Vin)을(-)단자로 입력받아서 비교하는 제2비교기(20)와, 상기 비교기들의 출력이 연결되는 출력단자(30)와, 제너다이오드(D1)와 전원(Vcc) 사이에 삽입된 저항(R1)과, 제너다이오드(D1)와 NTC 사이에 연결된 저항(R3)과, NTC와 병렬연결된 저항(R4)과, 제1비교기(10)의 (+)단과 저항(R3) 사이에 연결된 저항(R5)과, 제2비교기(20)의 (-)단에 연결된 저항(R7)과, 상기 저항(R5)과 저항(R7) 사이에 연결된 저항(R6)으로 구성됨을 특징으로 한다.The temperature sensing device of the lithium-ion battery of the present invention for achieving the above object, the zener diode (D1) for outputting the input power (Vcc) to a predetermined input voltage (Vin), and the internal temperature of the lithium-ion battery NTC for detecting a signal, a first comparator 10 for receiving a signal input from the NTC as a negative terminal and receiving an input voltage Vin as a positive terminal for comparison, and a signal input from the NTC. Is inputted as a (+) terminal and the input voltage (Vin) is input to the (-) terminal to compare the second comparator 20, the output terminal 30 is connected to the output of the comparators and the zener diode (D1) Resistor R1 inserted between the power supply and the power supply Vcc, resistor R3 connected between the zener diodes D1 and NTC, resistor R4 connected in parallel with the NTC, and (+) of the first comparator 10. The resistor R5 connected between the terminal and the resistor R3, the resistor R7 connected to the negative terminal of the second comparator 20, and between the resistor R5 and the resistor R7 It is characterized by consisting of a connected resistor (R6).

도 1은 본 발명에 의한 리튬-이온 배터리의 온도감지장치의 회로도,1 is a circuit diagram of a temperature sensing device of a lithium-ion battery according to the present invention;

도 2는 리튬-이온 배터리의 단자상태를 도시한 개략도,2 is a schematic diagram showing a terminal state of a lithium-ion battery;

도 3은 본 발명의 리튬-이온 배터리의 온도감지장치를 이용한 충전기의 일실시예의 회로도,3 is a circuit diagram of an embodiment of a charger using a temperature sensing device of a lithium-ion battery of the present invention;

도 4는 본 발명의 온도감지장치의 작동상태를 나타내는 플로우차트이다.4 is a flowchart showing an operating state of the temperature sensing device of the present invention.

<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>

10: 제1비교기 20: 제2비교기10: first comparator 20: second comparator

30: 출력단자 40: 리튬-이온 배터리30: output terminal 40: lithium-ion battery

50: 집적회로 D1,D2: 제너다이오드50: integrated circuit D1, D2: zener diode

R1,R2,R3,R4,R5,R6,R7,R8: 저항 R9,R10,R11,R12,R13: 저항R1, R2, R3, R4, R5, R6, R7, R8: Resistor R9, R10, R11, R12, R13: Resistor

Q1,Q2,Q3: 트랜지스터1,2,3Q1, Q2, Q3: Transistors 1,2,3

이하 첨부된 도면을 참고하여 본 발명의 리튬-이온 배터리의 온도감지장치를 상세히 설명하면 다음과 같다.Hereinafter, a temperature sensing device of a lithium-ion battery of the present invention will be described in detail with reference to the accompanying drawings.

본 발명은 리튬-이온 배터리를 충전하는 경우에 주위온도가 필요이상으로 높아서 리튬-이온 배터리가 폭발하는 것을 방지할 수 있도록 비교기를 이용하여 충전이 허용되는 배터리의 온도감지를 간단히 해결할 수 있다.The present invention can easily solve the temperature detection of the battery is allowed to charge using a comparator to prevent the explosion of the lithium-ion battery because the ambient temperature is higher than necessary when charging the lithium-ion battery.

도 1은 본 발명에 의한 리튬-이온 배터리의 온도감지장치의 회로도이다.1 is a circuit diagram of a temperature sensing device of a lithium-ion battery according to the present invention.

도시된 바와 같이, 입력되는 전원(Vcc)을 소정의 입력전압(Vin)으로 출력하는 제너다이오드(D1)와, 리튬-이온 배터리의 내부 온도를 감지하기 위한 NTC와, 상기 NTC로부터 입력되는 신호를 (-)단자로 입력받고 전압(Vin)을 (+)단자로 입력받아서 비교하는 제1비교기(10)와, 상기 NTC로부터 입력되는 신호를 (+)단자로 입력받고 전압(Vin)을 (-)단자로 입력받아서 비교하는 제2비교기(20)와, 상기 비교기들의 출력이 연결되는 출력단자(30)와, 제너다이오드(D1)와 전원(vCC) 사이에 삽입된 저항(R1)과, 제너다이오드(D1)와 NTC 사이에 연결된 저항(R3)과, NTC와 병렬연결된저항(R4)과, 제1비교기(10)의 (+)단에 연결된 저항(R5)과, 제2비교기(20)의 (-)단에 연결된 저항(R7)과, 상기 저항(R5)과 저항(R7) 사이에 연결된 저항(R6)들을 포함하고 있다.As shown, a zener diode D1 for outputting the input power Vcc to a predetermined input voltage Vin, an NTC for sensing an internal temperature of a lithium-ion battery, and a signal input from the NTC. The first comparator 10 for inputting the negative terminal and comparing the voltage Vin to the positive terminal, and the signal input from the NTC to the positive terminal and receiving the voltage Vin A second comparator 20 for inputting and comparing the terminal; an output terminal 30 to which the outputs of the comparators are connected; a resistor R1 inserted between the zener diode D1 and the power supply vCC; Resistor R3 connected between diode D1 and NTC, resistor R4 connected in parallel with NTC, resistor R5 connected to the positive terminal of first comparator 10, and second comparator 20 It includes a resistor (R7) connected to the (-) terminal of, and a resistor (R6) connected between the resistor (R5) and the resistor (R7).

제너다이오드(D1)는 정전압 공급용으로서, 가령 전원(Vcc)이 5V 이상이고 제너다이오드(D1)가 5V용일 때에 입력전압(Vin)이 5V가 되도록 제한하는 역할을 한다. 설명의 편의를 위하여 입력전압(Vin)은 5V라고 가정한다.The zener diode D1 is for supplying a constant voltage, and serves to limit the input voltage Vin to 5V when the power supply Vcc is 5V or more and the zener diode D1 is 5V. For convenience of explanation, it is assumed that the input voltage Vin is 5V.

제1비교기(10)와 제2비교기(20)는 입력단(+)(-)을 통하여 입력되는 신호의 크기를 비교하는 비교기(comparator)이다. 상기 제1비교기(10)와 제2비교기(20)는 NTC로부터 입력되는 신호의 크기를 비교하여 그 결과를 출력한다. NTC(Negative Temperature Coefficient)는 리튬-이온 배터리의 내부 온도를 감지하기 위한 온도감지용저항으로서 통상 부온도계수를 갖는다. 도면에서 NTC의 일측단자인 ㉠ 지점에 배터리의 TEM- 단자가 연결된다. 상온에서 통상적인 NTC의 값은 저항값으로서 10㏀이 된다.The first comparator 10 and the second comparator 20 are comparators for comparing the magnitudes of the signals input through the input terminal (+) (−). The first comparator 10 and the second comparator 20 compare the magnitudes of the signals input from the NTC and output the results. NTC (Negative Temperature Coefficient) is a temperature sensing resistor for sensing the internal temperature of a lithium-ion battery and usually has a negative temperature coefficient. In the figure, the TEM terminal of the battery is connected to the point 인, which is one terminal of the NTC. The typical NTC value at room temperature is 10 kW as a resistance value.

또한 Vcc, GND는 각각 인가전압을 나타내고 있으며, 저항(R4)에 연결되어 있는 화살표는 리튬-이온 배터리의 GND(미도시됨)에 연결된다. 화살표로 표시한 것은 도 1의 GND와 구별하기 위한 것이다. 상기 저항(R1~R8)들은 분압저항들이다.In addition, Vcc and GND represent applied voltages, respectively, and an arrow connected to the resistor R4 is connected to GND (not shown) of the lithium-ion battery. The arrows are used to distinguish them from the GND of FIG. 1. The resistors R1 to R8 are voltage divider resistors.

상기와 같은 구성을 가진 본 발명의 리튬-이온 배터리의 온도감지장치의 작동상태를 설명하면 다음과 같다.Referring to the operating state of the temperature sensing device of the lithium-ion battery of the present invention having the above configuration as follows.

공급전원(Vcc)이 5V 이상이고, 제너다이오드(D1)의 정격전압이 5V로서 전압제어용이라고 하면, 입력전압(Vin)은 5V가 된다. 상온의 경우에 NTC의 저항값은 약10㏀이다. 저항(R3,R4)가 고정값을 가진 상태에서, 어떤 이유로 인하여 배터리(40)의 온도가 상승하면 NTC는 부온도계수를 가지므로 저항값은 떨어지게 된다. 따라서 ㉠ 지점의 전위는 떨어지게 된다. 만일, 어떠한 이유로 인하여 배터리(40)의 온도가 하강하면 NTC의 저항값은 상승하고 이에 따라서 ㉠ 지점의 전위는 상승하게 된다. 상기와 같이 하여 온도변화에 따른 전위변화를 감지할 수 있다. 상기 NTC는 배터리에 인접하여 설치되어서 배터리의 주변온도를 측정한다.If the supply power supply Vcc is 5V or more, and the rated voltage of the zener diode D1 is 5V for voltage control, the input voltage Vin becomes 5V. At room temperature, the resistance of NTC is about 10 mA. In the state where the resistors R3 and R4 have a fixed value, if the temperature of the battery 40 rises for some reason, the NTC has a negative temperature coefficient and thus the resistance value drops. Therefore, the potential at the point V falls. If, for some reason, the temperature of the battery 40 falls, the resistance value of the NTC rises and accordingly the potential at the k-point rises. As described above, the potential change according to the temperature change can be detected. The NTC is installed adjacent to the battery to measure the ambient temperature of the battery.

리튬-이온 배터리(40)의 규격상 NTC에 의하여 측정된 배터리 온도의 상한값은 상기 ㉠지점에서의 전위가 (0.4 * 입력전압(Vin))이며, 배터리 온도의 하한값은 ㉠ 지점에서의 전위가 (0.6 * 입력전압(Vin))의 범위에 대응되도록 규정되어 있다. 상한 및 하한값의 범위를 벗어나면 폭발의 위험성이 있거나 충전이 되지 않을 가능성이 있다.According to the standard of the lithium-ion battery 40, the upper limit value of the battery temperature measured by NTC is the potential at the point of (0.4 * input voltage Vin), and the lower limit of the battery temperature is the potential at the point of ( 0.6 * It is specified to correspond to the range of input voltage (Vin). Beyond the upper and lower limits, there is a risk of explosion or not charging.

이와 같이, 온도에 대응하는 상기 ㉠ 지점에서의 전위변화값을 감지하여 본 발명에서는 용이하게 온도를 감지할 수 있는 것이다. ㉠ 지점에서의 배터리 온도의 상한값에 해당되는 전위는 0.4 * 5 = 2V이며, 하한값은 0.6 * 5 = 3V가 되어서 정상적으로 충전을 할 수 있는 온도의 범위는 2 ~ 3V가 되는 것이다. 따라서 ㉡ 지점과 ㉢ 지점에서 입력전압의 범위를 각각 3V, 2V로 설정하면, 규격에 정해진 배터리의 충전온도범위를 만족할 수 있게 된다.As such, the temperature change may be easily detected in the present invention by detecting a potential change value at the point of V corresponding to the temperature. The potential corresponding to the upper limit of battery temperature at point is 0.4 * 5 = 2V, and the lower limit is 0.6 * 5 = 3V, so that the temperature range for normal charging is 2 to 3V. Therefore, when the input voltage range is set to 3V and 2V, respectively, at the point V and point V, the charging temperature range of the battery specified in the standard can be satisfied.

배터리(40)의 내부 온도가 상승하여 ㉠ 지점에서의 전압이 3V를 초과하는 경우에 있어서, 제1비교기(10)의 (-)단에 입력되는 전압은 3V가 되고 제2비교기(20)의 (+)단에 입력되는 전압이 3V가 되므로 출력단자(30)를 통하여 출력되는 신호는하이(HIGH)가 된다.When the internal temperature of the battery 40 rises and the voltage at the point of excess exceeds 3V, the voltage input to the negative terminal of the first comparator 10 becomes 3V and the second comparator 20 Since the voltage input to the (+) terminal is 3V, the signal output through the output terminal 30 is high (HIGH).

또한 내부온도가 하강하여 ㉠ 지점에서의 전압이 2V에 미달하는 경우에 있어서, 제1비교기(10)의 (-)단에 입력되는 전압은 2V가 되고 제2비교기(20)의 (+)단에 입력되는 전압이 2V가 되므로 출력단자(30)를 통하여 출력되는 신호는 하이(HIGH)가 된다.In addition, when the internal temperature drops and the voltage at the point of ㉠ is less than 2V, the voltage input to the negative terminal of the first comparator 10 becomes 2V and the positive terminal of the second comparator 20 Since the voltage input to 2V becomes the signal output through the output terminal 30 is high (HIGH).

그러나 ㉠ 지점에서의 전압이 2 ~ 3V 사이에 존재하면 출력단자(30)를 통하여 출력되는 신호는 로우(LOW)가 된다. 상기와 같이 본 발명에 의하면 충전이 허용되는 배터리 온도와 허용되지 않는 배터리 온도가 완전히 분리되어서 출력신호가 출력된다. 이러한 동작 상태가 도 4의 플로우차트에 표시되어 있다.However, if the voltage at the ㉠ point is between 2 to 3V, the signal output through the output terminal 30 goes low. As described above, according to the present invention, the battery temperature at which charging is permitted and the battery temperature at which the charging is not allowed are completely separated, thereby outputting an output signal. This operating state is shown in the flowchart of FIG.

상기와 같은 수치를 이용하는 경우에, 저항(R3,R4)(R6,R7)의 저항값은 다음과 같은 식에서 구할 수 있다.In the case of using the above numerical values, the resistance values of the resistors R3 and R4 (R6 and R7) can be obtained by the following equation.

((R6+R7)/(R5+R6+R7)) * 5(V) = 3(V), (R7/(R5+R6+R7)) * 5(V) = 2(V), 여기에서 괄호안의 V는 볼트이다. 상기의 수치를 이용하여 계산하면, R5 = 2㏀, R6 = 1㏀, R7 = 2㏀으로 결정할 수 있다.((R6 + R7) / (R5 + R6 + R7)) * 5 (V) = 3 (V), (R7 / (R5 + R6 + R7)) * 5 (V) = 2 (V), where V in parentheses is the bolt. When it calculates using said numerical value, it can determine with R5 = 2kV, R6 = 1kV, R7 = 2kV.

그리고, 저항(R3,R4)의 값은 ㉠ 지점의 전압이 2 ~ 3V 사이의 중간값인 2.5V가 되도록 설정하는 것이 바람직하다. 제너다이오드(D1)가 5V용일 때 이 조건을 만족하는 저항(R3,R4)의 저항값을 구하는 식은 다음과 같다.The values of the resistors R3 and R4 are preferably set such that the voltage at the point V is 2.5V, which is an intermediate value between 2 and 3V. When zener diode D1 is for 5V, the following formula calculates resistance values of resistors R3 and R4 that satisfy this condition.

((X) / (X + R3)) * 5(V) = 2.5(V),((X) / (X + R3)) * 5 (V) = 2.5 (V),

여기에서 X = (10㏀ * R4)/(10㏀ + R4)가 된다. 10㏀은 NTC의 상온에서의 저항값이며, 저항(R2)는 풀업(pull up) 저항이다.Where X = (10 ms * R4) / (10 ms + R4). 10 mA is a resistance value at room temperature of NTC, and resistor R2 is a pull up resistance.

도3에는 상기와 같은 구성을 가진 본 발명의 리튬-이온 배터리의 온도감지장치를 이용한 충전기의 일실시예가 도시되어 있다.Figure 3 shows an embodiment of a charger using the temperature sensing device of the lithium-ion battery of the present invention having the configuration as described above.

도시된 바와 같이 점선으로 표시된 본 발명의 리튬-이온 배터리의 온도감지장치(A)에 트랜지스터(Q1,Q2,Q3)와 집적회로(50)와, 저항들이 더 추가됨을 알 수 있다. 온도감지장치(A)의 작동은 상술한 바 있으므로 생략하고 충전장치의 동작을 설명하면 다음과 같다. 상기 집적회로(50)는 벤치마큐사의 BP2056 IC를 사용하여 구성하였다.As shown, it can be seen that the transistors Q1, Q2, Q3, the integrated circuit 50, and the resistors are further added to the temperature sensing device A of the lithium-ion battery of the present invention indicated by the dotted line. Since the operation of the temperature sensing device (A) has been described above, the operation of the charging device will be omitted as follows. The integrated circuit 50 was constructed using Benchmark's BP2056 IC.

집적회로(50)는 충전동작이 개시되면 배터리단자(BAT+)(BAT-)로부터 배터리(40)의 충전전압을 감지하게 된다. 감지된 배터리(40)의 전압이 2V 이하인 경우에는 트랜지스터(Q1)은 온되고, 트랜지스터(Q2)는 오프상태가 된다. 따라서 DC+ 단자로부터 배터리의 (+)단자로 입력되는 충전전류는 저항(R13)에 의하여 감소하게 된다. 배터리(40)의 전압이 2V인 경우에는 트리클충전(Trickle Charge)을 하게 된다.When the charging operation is started, the integrated circuit 50 detects the charging voltage of the battery 40 from the battery terminals BAT + and BAT−. When the sensed voltage of the battery 40 is 2V or less, the transistor Q1 is turned on and the transistor Q2 is turned off. Therefore, the charging current input from the DC + terminal to the positive terminal of the battery is reduced by the resistor R13. When the voltage of the battery 40 is 2V, a trickle charge is performed.

트리클 충전은 세류(細流) 충전을 의미하는 것으로서, 배터리의 단속적인 미량의 방전이나 자기 방전을 보상하기 위하여 8시간율방전 전류의 0.5 ~ 2% 정도의 일정한 전류로 충전을 계속하는 동작을 말한다. 트리클 충전명령은 집적회로(50)의 TRKL단을 통하여 출력되어서 트리클 충전을 하도록 트랜지스터(Q1)를 작동시킨다.The trickle charge refers to trickle charge, and is an operation of continuing charging with a constant current of about 0.5 to 2% of the 8 hour rate discharge current to compensate for intermittent trace discharge or self discharge of the battery. The trickle charge command is output through the TRKL stage of the integrated circuit 50 to operate the transistor Q1 to trickle charge.

계속하여 배터리의 충전상태를 감지하여, 전압이 계속하여 상승하면 트랜지스터(Q1)은 오프, 트랜지스터(Q2)는 온하여 최대의 전류로 충전을 진행한다. 충전중에 배터리(40)의 전압이 일정전압(4.1V) 이상이 되면 충전전류를 점차로 감소시키면서 만충전에 도달하게 된다.Subsequently, when the state of charge of the battery is sensed and the voltage continues to rise, the transistor Q1 is turned off and the transistor Q2 is turned on to perform charging with the maximum current. When the voltage of the battery 40 becomes higher than a predetermined voltage (4.1V) during charging, full charge is reached while gradually decreasing the charging current.

충전중에 배터리의 온도가 충전불가능한 상태에 도달하면 본 발명의 리튬-이온 배터리의 온도감지장치(A)의 회로가 작동되어서 출력단자(미도시됨)를 통하여 하이(HIGH) 신호가 출력된다. 이 하이신호는 트랜지스터(Q3)를 턴 온시켜 집적회로(50)의 INH 단자를 하이(HIGH) 상태로 만든다. INH 단자가 하이가 되면 집적회로(50)는 충전동작을 중지하게 되므로 결과적으로 배터리의 충전이 중지된다.When the temperature of the battery reaches an unchargeable state during charging, the circuit of the temperature sensing device A of the lithium-ion battery of the present invention is operated to output a HIGH signal through an output terminal (not shown). This high signal turns on the transistor Q3 to make the INH terminal of the integrated circuit 50 high. When the INH terminal becomes high, the integrated circuit 50 stops the charging operation, and as a result, charging of the battery is stopped.

상기의 설명에서 본 발명의 리튬-이온 배터리의 온도감지장치가 충전기에 적용된 것이 설명되었지만, 다른 온도감지가 필요한 장치에도 적용될 수 있음은 본 발명이 속하는 분야의 당업자에게는 명백한 것이다.In the above description, it has been described that the temperature sensing device of the lithium-ion battery of the present invention is applied to a charger, but it is obvious to those skilled in the art that the present invention may be applied to a device requiring other temperature sensing.

상기와 같이 본 발명에 의하면, 다수의 비교기를 이용하여 온도감지센서의 온도를 측정, 비교하여 충전이 허용되는 배터리의 온도를 간단하게 측정할 수 있으며, 충전기에도 용이하게 적용되어서 온도변화에 의한 리튬-이온 배터리의 폭발이나 충전불량을 방지할 수 있다.According to the present invention as described above, by measuring and comparing the temperature of the temperature sensor using a plurality of comparators, it is possible to simply measure the temperature of the battery that is allowed to charge, it is also easily applied to the charger to the lithium by the temperature change -It can prevent the battery from exploding or charging.

본 발명은 기재된 구체예에 대해서만 상세히 설명되었지만 본 발명의 사상과 범위내에서 변형이나 변경할 수 있음은 본 발명이 속하는 분야의 당업자에게는 명백한 것이며, 그러한 변형이나 변경은 첨부한 특허청구범위에 속한다 할 것이다.Although the invention has been described in detail only with respect to the described embodiments, it will be apparent to those skilled in the art that modifications and variations can be made within the spirit and scope of the invention, and such variations or modifications will belong to the appended claims. .

Claims (1)

입력되는 전원(Vcc)을 소정의 입력전압(Vin)으로 출력하는 제너다이오드(D1)와, 리튬-이온 배터리의 내부 온도를 감지하기 위한 온도감지용저항(NTC)와, 상기 온도감지용저항(NTC)로부터 입력되는 신호를 (-)단자로 입력받고 입력전압(Vin)을 (+)단자로 입력받아서 비교하는 제1비교기와, 상기 온도감지용저항(NTC)로부터 입력되는 신호를 (+)단자로 입력받고 입력전압(Vin)을 (-)단자로 입력받아서 비교하는 제2비교기와, 상기 비교기들의 출력이 연결되는 출력단자와, 제너다이오드(D1)와 전원(Vcc) 사이에 삽입된 저항(R1)과, 제너다이오드(D1)와 온도감지용저항(NTC) 사이에 연결된 저항(R3)과, 온도감지용저항(NTC)와 병렬연결된 저항(R4)과, 제1비교기의 (+)단과 저항(R3) 사이에 연결된 저항(R5)과, 제2비교기의 (-)단에 연결된 저항(R7)과, 상기 저항(R5)과 저항(R7) 사이에 연결된 저항(R6)으로 구성됨을 특징으로 하는 리튬-이온 배터리의 온도감지장치.Zener diode D1 for outputting the input power Vcc to a predetermined input voltage Vin, a temperature sensing resistor NTC for sensing the internal temperature of a lithium-ion battery, and the temperature sensing resistor ( A first comparator comparing the signal input from the NTC) with the negative terminal and the input voltage Vin with the (+) terminal, and comparing the signal input from the temperature sensing resistor (NTC) with the (+) A second comparator for inputting the terminal and comparing the input voltage Vin with the (-) terminal, an output terminal to which the outputs of the comparators are connected, and a resistor inserted between the zener diode D1 and the power supply Vcc. (R1), a resistor (R3) connected between the zener diode (D1) and the temperature sensing resistor (NTC), a resistor (R4) connected in parallel with the temperature sensing resistor (NTC), and (+) of the first comparator A resistor R5 connected between the stage and the resistor R3, a resistor R7 connected to the negative terminal of the second comparator, and a connection between the resistor R5 and the resistor R7. A resistor (R6) lithium, characterized by consists of - the temperature of the ion battery sensor.
KR1019990065258A 1999-12-29 1999-12-29 The device for detecting temperature of litum-ion battery KR20010065381A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104458044A (en) * 2014-12-19 2015-03-25 浙江比洛德传动技术有限公司 Sensing device of intelligent fan control device suitable for vehicle cooling system
FR3083307A1 (en) * 2018-06-29 2020-01-03 Sc2N TEMPERATURE SENSOR
KR20200005104A (en) * 2018-07-05 2020-01-15 주식회사 엘지화학 Method for detecting fault of battery pack and apparatus performing the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104458044A (en) * 2014-12-19 2015-03-25 浙江比洛德传动技术有限公司 Sensing device of intelligent fan control device suitable for vehicle cooling system
FR3083307A1 (en) * 2018-06-29 2020-01-03 Sc2N TEMPERATURE SENSOR
KR20200005104A (en) * 2018-07-05 2020-01-15 주식회사 엘지화학 Method for detecting fault of battery pack and apparatus performing the same

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