KR20030038992A - Battery state of charge presumed method of battery management system for electric vehicle - Google Patents
Battery state of charge presumed method of battery management system for electric vehicle Download PDFInfo
- Publication number
- KR20030038992A KR20030038992A KR1020010069787A KR20010069787A KR20030038992A KR 20030038992 A KR20030038992 A KR 20030038992A KR 1020010069787 A KR1020010069787 A KR 1020010069787A KR 20010069787 A KR20010069787 A KR 20010069787A KR 20030038992 A KR20030038992 A KR 20030038992A
- Authority
- KR
- South Korea
- Prior art keywords
- battery
- soc
- current
- discharge current
- voltage
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000005259 measurement Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 241000195480 Fucus Species 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000010763 heavy fuel oil Substances 0.000 description 1
Classifications
-
- 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
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Secondary Cells (AREA)
- Tests Of Electric Status Of Batteries (AREA)
Abstract
Description
본 발명은 전기자동차용 전지관리시스템(Battery Management System: BMS)의배터리 충전상태(State Of Charge: SOC; 이하, SOC라 한다) 추정 방법에 관한 것으로서, 보다 상세하게는 배터리의 방전전류에 대한 배터리 전압대 SOC 특성곡선으로부터 배터리의 충전상태를 추정하여 현재의 충전상태 추정치를 보상할 수 있도록 한 전기자동차용 전지관리시스템의 배터리 충전상태 추정 방법에 관한 것이다.The present invention relates to a method of estimating a state of charge (SOC) of an battery management system (BMS) for an electric vehicle, and more particularly, to a battery for a discharge current of a battery. The present invention relates to a method of estimating the state of charge of a battery in an electric vehicle battery management system, which estimates the state of charge of a battery from a voltage versus SOC characteristic curve to compensate for the current state of charge.
최근의 자동차 개발 추세는 대기오염에 심각한 영향을 주고 있는 현재의 가솔린이나 중유를 주연료로 사용하여 동력을 얻도록 된 차량 대신에 공해발생이 적은 차량을 개발하기 위하여 많은 연구가 이루어지고 있는 바, 그 중 하나로서 전력에 의하여 움직이는 전기자동차의 개발에 많은 노력을 기울이고 있다.Recent development trends of automobiles have been conducted to develop vehicles with low pollution instead of vehicles powered by gasoline or heavy fuel oil, which are seriously affecting air pollution. As one of them, much effort is being made to develop electric vehicles driven by electric power.
전기자동차는 구동연료로서 대개 충전가능한 2차전지인 배터리(battery)를 사용하고 있으며, 배터리에서 출력되는 전원으로 동력발생장치를 구동시키고 이를 동력전달장치를 통해 구동휠로 전달하여 구동휠을 회전시키므로써 전기자동차를 구동시킨다.Electric vehicles generally use a rechargeable battery (battery) as a driving fuel. By driving the power generating device with the power output from the battery, it is transmitted to the driving wheel through the power transmission device to rotate the driving wheel. Drive your electric vehicle.
이러한 충전가능한 2차전지의 하나인 배터리는 대용량이고 충전 및 방전 성능이 좋은 이유로 전기자동차 등 각종 기기의 전지로서 주목받고 있다. 상기 배터리를 에너지원으로 하는 기기, 예를 들면 전기자동차에 있어서 배터리의 남아 있는 잔류용량을 실시간으로 검출하는 것이 중요하다.Batteries, which are one of such rechargeable secondary batteries, have attracted attention as batteries of various devices such as electric vehicles because of their large capacity and good charge and discharge performance. In a device using the battery as an energy source, for example, an electric vehicle, it is important to detect the remaining capacity of the battery in real time.
그래서, 종래에는 전기자동차용 전지관리시스템에서 방전개시점으로부터 배터리의 방전전류, 온도 및 전압을 수시로 검출하여 배터리의 충전상태를 추정한다. 이때, 전기자동차용 전지관리시스템에서는 방전개시시의 퓨커트(Peukert) 방정식에 의해 구한 배터리의 초기 사용 가능용량에서 측정된 방전전류를 시간에 대해 적분하여 구한 현재시점까지 사용한 배터리 사용 가능용량을 빼므로써 SOC를 추정한다. 이와 같이, 배터리의 SOC를 추정하므로써 전기자동차의 배터리 충전을 적절한 시기에 실시할 수 있다.Thus, conventionally, in the battery management system for an electric vehicle, the discharge current, temperature, and voltage of the battery are frequently detected from the discharge start point, and the state of charge of the battery is estimated. At this time, in the battery management system for electric vehicles, the available battery capacity used up to the present time determined by integrating the discharge current measured from the initial available capacity of the battery determined by the Peukert equation at the start of discharge over time is obtained. We estimate the SOC. In this way, the battery charging of the electric vehicle can be performed at an appropriate time by estimating the SOC of the battery.
그러나, 종래의 방법에서는 방전전류의 측정시 생기는 오차를 시간에 따라 적분하기 때문에 시간이 지남에 따라 오차가 커지는 단점이 있다. 따라서, 이 오차를 최소화하기 위해서는 방전전류의 측정주기를 짧게 하거나 회로를 정밀하게 설계 해야 하는 어려움이 있다.However, in the conventional method, since the error generated during the measurement of the discharge current is integrated over time, there is a disadvantage in that the error increases over time. Therefore, in order to minimize this error, it is difficult to shorten the measurement cycle of the discharge current or to design the circuit precisely.
이에, 본 발명의 목적은 배터리의 방전전류에 대한 배터리 전압대 SOC 특성곡선으로부터 정확한 배터리의 SOC를 추정하므로써 현재의 SOC 추정치를 실시간으로 보상할 수 있도록 한 전기자동차용 전지관리시스템의 배터리 충전상태 추정 방법을 제공하는데 있다.Accordingly, an object of the present invention is to estimate the state of charge of a battery in a battery management system for an electric vehicle, which can compensate the current SOC estimate in real time by estimating the exact SOC of the battery from the battery voltage vs. SOC characteristic curve of the discharge current of the battery. To provide a method.
상기와 같은 목적을 달성하기 위하여 본 발명에 따른 전기자동차용 전지관리시스템의 배터리 충전상태 추정 방법은 전류센서, 전압센서 및 온도센서를 통하여 배터리의 방전전류, 전압 및 온도를 측정하는 단계와, 배터리 방전전류에 대한 전압 특성에 의한 SOC 추정에 필요한 매개변수를 조정하는 단계와, 상기 전류센서를 통하여 측정된 배터리의 방전전류(Ib)에 대해 퓨커트(Peukert) 방정식을 이용하여 SOC를 추정하는 단계와, 상기 SOC의 추정이 완료되면, 전류센서를 통하여 측정된 방전전류가 지정된 전류영역(C/n) 안에 포함되는지를 판단하는 단계와, 상기 측정된 방전전류가 지정된 전류영역 안에 포함되면, IV 체크값(IV_Chk)을 1 증가시킨다음, 증가된 IV 체크값이 지정된 값 이상인지를 판단하는 단계와, 상기 IV 체크값이 지정된 값 이상이면, 일정한 방전전류에 대한 SOC 보상 추정곡선을 이용하여 SOC 추정치를 보상하는 단계, 및 상기 SOC 추정치에 대한 보상이 완료되면, 상기 IV 체크값(IV_Chk)을 초기화하고, 보상이 완료된 SOC를 표시하는 단계를 포함한다.In order to achieve the above object, a method of estimating a state of charge of a battery of an electric vehicle battery management system according to the present invention includes measuring a discharge current, a voltage, and a temperature of a battery through a current sensor, a voltage sensor, and a temperature sensor; Adjusting the parameters necessary for the SOC estimation by the voltage characteristics for the discharge current, and using the Pukerker equation for the discharge current (I b ) of the battery measured by the current sensor to estimate the SOC When the estimation of the SOC is completed, determining whether the discharge current measured by the current sensor is included in the specified current region (C / n), and if the measured discharge current is included in the specified current region, Incrementing the IV check value (IV_Chk) by 1, and then determining whether the increased IV check value is greater than or equal to the specified value, and if the IV check value is greater than or equal to the specified value Compensating the SOC estimate using the SOC compensation estimate curve for all currents, and when the compensation for the SOC estimate is completed, initializing the IV check value (IV_Chk) and displaying the completed SOC. do.
도 1은 일반적인 전기자동차의 배터리 충전상태 추정회로를 나타낸 블럭도.1 is a block diagram showing a battery state of charge estimation circuit of a typical electric vehicle.
도 2는 본 발명에 따른 전기자동차용 전지관리시스템의 배터리 충전상태 추정 방법의 흐름도.2 is a flowchart of a method of estimating battery state of charge of a battery management system for an electric vehicle according to the present invention;
도 3은 여러 방전전류에 대한 배터리 전압의 변화곡선.3 is a change curve of a battery voltage for various discharge currents.
도 4는 방전전류에 따른 전압에 대한 SOC 보상 추정곡선.4 is an SOC compensation estimation curve for a voltage according to a discharge current.
도 5는 여러 온도 T에 따른 전압에 대한 SOC 보상 추정곡선.5 is an estimated SOC compensation curve for voltage at various temperatures T;
* 도면의 주요부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings
10 : 배터리부 20 : 온도센서부10: battery unit 20: temperature sensor unit
30 : 부하 40 : 전류센서부30: load 40: current sensor
50 : 전지관리시스템 51 : 전압센서부50: battery management system 51: voltage sensor
52 : A/D 컨버터 53 : 논리연산부52: A / D converter 53: logic operation unit
이하, 첨부된 도면을 참조하여 본 발명을 상세하게 설명하고자 한다.Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.
도 1은 일반적인 전기자동차의 배터리 충전상태 추정회로를 나타낸 블럭도이고, 도 2는 본 발명에 따른 전기자동차용 전지관리시스템의 배터리 충전상태 추정 방법의 흐름도이다.1 is a block diagram illustrating a battery charge state estimation circuit of a general electric vehicle, and FIG. 2 is a flowchart of a method of estimating battery state of charge of a battery management system for an electric vehicle according to the present invention.
이들 도면을 참조하여 설명하면, 배터리 충전상태 추정회로는 배터리부(10)의 전원이 부하(30)에 공급되고, 배터리부(10)와 접속된 온도센서부(20)에서 배터리의 온도를 측정하고, 배터리부(10)의 출력단에 접속된 전류센서부(40)가 상기 배터리부(10)의 방전전류량을 검출하는 구조로 이루어진다.Referring to these drawings, the battery charge state estimation circuit measures the temperature of the battery in the temperature sensor unit 20 connected to the battery unit 10 and the power of the battery unit 10 is supplied to the load 30. The current sensor unit 40 connected to the output terminal of the battery unit 10 is configured to detect the amount of discharge current of the battery unit 10.
또한, 상기 배터리부(10)와 접속된 전지관리시스템(50)의 논리연산부(53)는 온도센서부(20) 및 전류센서부(40)에서 측정된 배터리의 온도 및 방전전류와, 내부에 구비된 전압센서부(51)에서 측정한 배터리 모듈의 전압을 바탕으로 배터리의 SOC를 추정한다.In addition, the logic operation unit 53 of the battery management system 50 connected to the battery unit 10 includes the temperature and discharge current of the battery measured by the temperature sensor unit 20 and the current sensor unit 40, and internally. The SOC of the battery is estimated based on the voltage of the battery module measured by the provided voltage sensor unit 51.
이때, 상기 배터리부(10)의 배터리는 병렬로 연결되어 있고, 부하(30)는 배터리부(10)의 전원을 공급받아 구동하는 주행모터, 윈도우와이퍼, 방향지시기, 램프 등을 포함한다.At this time, the battery of the battery unit 10 is connected in parallel, the load 30 includes a driving motor, a window wiper, a direction indicator, a lamp and the like driven by receiving the power of the battery unit 10.
도 3은 여러 방전전류(C/n1, C/n2, C/n3)에 대한 배터리 전압의 변화곡선을 보인 것으로, 방전시간(hour)이 경과할 경우 어느 정도 완만하게 전압이 하강하다가 배터리의 방전이 완료되어 종지전압에 도달하면 더 이상 전압이 하강하지 않는다.3 shows a change curve of battery voltage for various discharge currents (C / n 1 , C / n 2 , C / n 3 ). When the discharge time (hour) elapses, the voltage gradually decreases. When the battery is discharged and the final voltage is reached, the voltage no longer drops.
상기 전류센서부(40)에서 배터리의 방전전류를 측정하고, 상기 전압센서부(40)는 방전전류에 따른 배터리 전압의 변화를 측정한다.The current sensor unit 40 measures the discharge current of the battery, and the voltage sensor unit 40 measures the change in battery voltage according to the discharge current.
전기자동차는 방전 시에 배터리의 SOC를 방전전류의 시간에 의한 적분치를 이용하여 추정한다. 이때, 상기 전류센서부(40)에서 방전전류를 측정할 경우 센서에 의한 미세한 오차와 A/D 컨버터(52)에서 아날로그 신호를 디지털 신호로 전환하는 과정에서 계산오차가 발생한다. 이 측정오차와 계산오차를 가진 전류를 시간에 대해 적분해서 방전전류량을 계산하므로 시간이 지남에 따라 오차가 커진다. 따라서, 전기자동차 운행 초기보다 운행을 오래한 후가 배터리 충전상태 추정한 값과 실제 충전상태의 오차가 커진다.The electric vehicle estimates the SOC of the battery at the time of discharge using the integral value of the discharge current over time. In this case, when measuring the discharge current in the current sensor unit 40, a small error caused by the sensor and a calculation error occurs in the process of converting an analog signal into a digital signal in the A / D converter 52. Since the amount of discharge current is calculated by integrating the current with this measurement error and calculation error over time, the error increases over time. Therefore, the error between the estimated state of charge of the battery and the actual state of charge increases after a long time from the beginning of the operation of the electric vehicle.
따라서, 이를 보상하기 위해서 전기자동차의 운행 중에 일정한 오차 내의 방전전류 Ib(C/n-α≤Ib≤C/n+α, C:배터리 용량전류, n:자연수)가 일정한 시간, 예를 들면 5초 이내에 측정되면 도 4와 같은 방전전류 C/n에 대한 배터리 전압대 SOC 보상 추정곡선으로부터 배터리의 충전상태를 추정하여 현재의 SOC 추정치를 보상한다.Therefore, in order to compensate for this, the discharge current I b (C / n-α≤I b ≤C / n + α, C: battery capacitance current, n: natural number) within a certain error during driving of the electric vehicle, for example, For example, when measured within 5 seconds, the state of charge of the battery is estimated from the battery voltage versus SOC compensation estimation curve for the discharge current C / n as shown in FIG. 4 to compensate for the current SOC estimate.
도 4는 방전전류, 즉 배터리 전압의 변화에 따른 SOC 보상 추정곡선으로서,도 4의 방전전류에 대한 SOC 보상 추정곡선을 이용하여 필요한 배터리의 SOC 보상치를 보상한다.4 is an SOC compensation estimation curve according to a discharge current, that is, a change in battery voltage, and a SOC compensation value of a battery is compensated for using the SOC compensation estimation curve for the discharge current of FIG. 4.
상기 배터리부(10)의 배터리를 일정한 전류로 방전시킴에 따른 배터리 전압의 변화곡선은 도 3과 같이 일정한 경향을 보이기 때문에 이를 이용하여 충전상태를 추정하면 상당히 정확한 충전상태 정보를 얻을 수 있다.Since the change curve of the battery voltage according to the discharge of the battery of the battery unit 10 with a constant current shows a constant tendency as shown in FIG. 3, when the charge state is estimated using this, highly accurate state of charge information can be obtained.
이때, 배터리는 방전전류의 변화에 대해 내부적인 화학반응이 느려서 전압이 빠르게 반영되지 못하고 안정화되는데 시간이 걸린다. 이와 같은 이유로 일정한 시간, 예를 들면 5초 후의 일정한 방전전류에 대한 배터리 전압을 필요로 한다.At this time, the battery has a slow internal chemical reaction to the change of the discharge current, it takes time to stabilize the voltage is not reflected quickly. For this reason, a battery voltage is required for a constant discharge current after a certain time, for example 5 seconds.
또한, 필요한 방전전류 C/n에서 n에 대한 결정은 배터리 제조회사의 자료나 자체 방전시험을 통해 얻어진 자료를 통해 여러 번의 방전시험을 행하여 얻어진 결과로부터 그래프 간의 오차범위가 최소인 n을 결정한다.In addition, the determination of n at the required discharge current C / n determines n having a minimum error range between graphs from the results obtained by performing a plurality of discharge tests through data obtained by a battery manufacturer or data obtained through a self discharge test.
상기와 같은 구성으로 이루어진 전기자동차용 전지관리시스템의 배터리 충전상태 추정 방법에 대한 실시예를 설명하면 다음과 같다.An embodiment of a method of estimating a state of charge of a battery of an electric vehicle battery management system having the above configuration will be described below.
전류센서부(40)에서 배터리의 방전전류를 측정하고, 전압센서부(40)는 방전전류에 따른 배터리 전압의 변화를 측정한다. 또한, 온도센서부(20)에서 배터리의 온도변화를 측정한다(S201).The current sensor unit 40 measures the discharge current of the battery, and the voltage sensor unit 40 measures the change in battery voltage according to the discharge current. In addition, the temperature sensor unit 20 measures the temperature change of the battery (S201).
상기 온도센서부(20) 및 전류센서부(40)에서 측정된 방전전류 및 배터리 온도에 대한 아날로그 신호는 전지관리시스템(50)의 A/D 컨버터(52)를 거쳐 디지털 신호로 변환되고, 변환된 신호는 논리연산부(53)에 입력된다.The analog signal for the discharge current and the battery temperature measured by the temperature sensor unit 20 and the current sensor unit 40 is converted into a digital signal via the A / D converter 52 of the battery management system 50, and converted The received signal is input to the logic operation unit 53.
상기 전지관리시스템(50)의 논리연산부(53)는 상기 입력된 배터리의 방전전류, 온도 및 전압을 통하여 SOC를 추정한다.The logic operation unit 53 of the battery management system 50 estimates the SOC based on the input discharge current, temperature, and voltage of the battery.
상기 논리연산부(53)는 먼저 배터리 방전전류에 대한 전압 특성에 의한 SOC 추정에 필요한 매개변수를 조정한다(S202).The logic operation unit 53 first adjusts a parameter required for SOC estimation based on a voltage characteristic with respect to a battery discharge current (S202).
다음, 배터리의 방전전류(Ib)에 대해 퓨커트 방정식을 이용하여 SOC를 추정한다(S203).Next, the SOC is estimated using the Fucus equation for the discharge current I b of the battery (S203).
이때, 퓨커트(Peukert) 방정식을 3단계로 나누어 적용하는데, 방전전류의 용량에 따라 아래 식(1)과 식(2)의 상수 K와 n(자연수)을 결정한다.At this time, the Peukert equation is divided into three stages, and the constants K and n (natural numbers) of Equations (1) and (2) are determined according to the capacity of the discharge current.
상기 배터리의 방전전류(Ib)에 대해 SOC를 추정하는 경우, 우선 배터리의 사용 가능한 배터리 용량(Ah_available)을 계산한다. 상기 배터리의 사용가능 용량은 식(1) 및 식(2)에 의해 구한다.When the SOC is estimated with respect to the discharge current I b of the battery, first, the available battery capacity Ah_available of the battery is calculated. The usable capacity of the battery is obtained from equations (1) and (2).
Ah_available = Capacity(Ah) = K ×Iavg (1-n)------------ 식(1)Ah_available = Capacity (Ah) = K × I avg (1-n) ------------ Equation (1)
, K= I1 n×t1= I2 n×t2------------ 식(2) , K = I 1 n × t 1 = I 2 n × t 2 ------------ Equation (2)
이때, Iavg는 평균 배터리 전류이고, I1은 운행중 최대 배터리 전류이며, I2는 운행중 최소 배터리 전류이다. 또한, t1은 일정전류 I1의 방전시간이고, t2는 일정전류 I2의 방전시간이다.At this time, I avg is the average battery current, I 1 is the maximum battery current during operation, I 2 is the minimum battery current during operation. In addition, t 1 is the discharge time of the constant current I 1 , and t 2 is the discharge time of the constant current I 2 .
상기 배터리의 평균 방전전류 Iavg에 따라 식(1)을 이용하여 배터리의 사용가능용량(Ah_available)을 계산한다. 다음, 상기와 같이 구해진 배터리의 사용 가능용량을 아래 식(3)에 대입하여 SOC를 추정한다.The available capacity Ah_available of the battery is calculated using Equation (1) according to the average discharge current I avg of the battery. Next, the SOC is estimated by substituting the available capacity of the battery obtained as described above in Equation (3).
SOC(%) = SOCinitial- () ×100 ------------ 식(3)SOC (%) = SOC initial- ( ) × 100 ------------ Formula (3)
이때, Ah_used는 사용한 배터리 용량이다.At this time, Ah_used is used battery capacity.
상기 식(1), 식(2) 및 식(3)을 이용하여 SOC의 추정이 완료되면, 전지관리시스템(50)의 논리연산부(53)는 전류센서부(40)에서 측정한 방전전류 Ib가 지정된 전류영역인 C/n 안에 포함되는지를 판단한다(S204).When the estimation of the SOC is completed using the equations (1), (2) and (3), the logic operation unit 53 of the battery management system 50 performs the discharge current I measured by the current sensor unit 40. It is determined whether b is included in C / n which is a designated current region (S204).
이때, 도 4의 지정된 전류영역 C/n에서의 n의 결정방법은 배터리 제조회사의 자료나 자체 방전시험을 통해 얻어진 자료를 통해 여러 번의 방전시험을 행하여 얻어진 결과로부터 그래프 간의 오차범위가 최소인 n을 결정한다.At this time, the determination method of n in the specified current region C / n of FIG. 4 is n with a minimum error range between the graphs from the results obtained by performing a plurality of discharge tests through the data of the battery manufacturer or the data obtained through the self discharge test. Determine.
상기 측정된 방전전류 Ib가 지정된 전류영역 C/n 안에 포함되면, IV 체크값(IV_Chk)을 1 증가시킨 다음, 증가된 IV 체크값(IV_Chk)이 지정된 값인 5 이상인지를 판단한다(S205)(S206).When the measured discharge current Ib is included in the designated current region C / n, the IV check value IV_Chk is increased by 1, and then it is determined whether the increased IV check value IV_Chk is equal to or greater than 5, which is the designated value (S205). S206).
이때, 상기 IV 체크값(IV_Chk)은 배터리가 일정한 전류로 방전될 때 전압이 안정화되는데 걸리는 시간이 대략 5초 정도이므로 최대값 5로 지정된다. 상기 5초의 시간은 배터리를 일정한 전류로 방전하다가 순간적으로 방전을 중단한 후 배터리의 전압이 안정화되어가는 시험결과로부터 얻어진 시간이다.In this case, the IV check value IV_Chk is set to a maximum value of 5 because the time taken for the voltage to stabilize when the battery is discharged with a constant current is about 5 seconds. The 5 second time is a time obtained from a test result in which the battery voltage is stabilized after the battery is discharged at a constant current and the discharge is momentarily stopped.
상기 IV 체크값이 5 이상이면, 상기 논리연산부(53)는 도 4의 일정한 방전전류 C/n에 대한 SOC 보상 추정곡선으로부터 얻어진 SOC를 볼츠만(Boltzman) 방정식을 이용하여 추정한 후 배터리의 SOC 추정치를 보상한다(S207).If the IV check value is greater than or equal to 5, the logic operation unit 53 estimates the SOC obtained from the SOC compensation estimation curve for the constant discharge current C / n of FIG. 4 using the Boltzman equation, and then estimates the SOC of the battery. To compensate (S207).
도 4의 전압에 대한 SOC 보상 추정곡선에 대한 볼츠만(Boltzman) 방정식은 아래 식(4)와 같다.The Boltzman equation for the SOC compensation estimation curve with respect to the voltage of FIG. 4 is expressed by Equation 4 below.
------------ 식(4) ------------ Formula (4)
상기 A1는 SOC 0%일 때의 전압이고, A2는 SOC 100%일 때의 전압이며, Vo는 SOC 50%일 때의 전압이다. 또한, dv는 그래프의 기울기이다.A1 is a voltage when SOC is 0%, A2 is a voltage when SOC is 100%, and Vo is a voltage when SOC is 50%. Also, d v is the slope of the graph.
상기 SOC 추정치에 대한 보상이 완료되면, 논리연산부(53)는 IV 체크값(IV_Chk)을 초기화하고(S208), 보상이 완료된 SOC를 표시한다(S210).When the compensation for the SOC estimate is completed, the logic operation unit 53 initializes the IV check value IV_Chk (S208), and displays the SOC for which the compensation is completed (S210).
한편, 도 4의 전압에 대한 SOC 보상 추정곡선은 온도센서부(20)에서 측정된 배터리 온도에 따라 도 5에 도시된 바와 같이 변한다. 이때, 도 5는 여러 온도(T1, T2, T3)에 따른 전압에 대한 SOC 보상 추정곡선이다.Meanwhile, the SOC compensation estimation curve with respect to the voltage of FIG. 4 changes as shown in FIG. 5 according to the battery temperature measured by the temperature sensor unit 20. In this case, FIG. 5 is an SOC compensation estimation curve for voltages according to various temperatures T1, T2, and T3.
이상에서 설명한 것은 본 발명에 따른 전기자동차용 전지관리시스템의 배터리 충전상태 추정 방법에 대한 하나의 실시예에 불과한 것으로서, 상기한 실시예에 한정되지 않고, 이하의 청구범위에서 청구하는 범위까지 본 발명의 기술적 정신이 있다고 할 것이다.What has been described above is just one embodiment of a method of estimating a state of charge of a battery of an electric vehicle battery management system according to the present invention, and is not limited to the above-described embodiment, and the present invention is defined to the claims that follow. Would have a technical spirit.
이상에서 살펴본 바와 같이, 본 발명에 따른 전기자동차용 전지관리시스템의 배터리 충전상태 추정 방법은 다음과 같은 효과가 있다.As described above, the battery charging state estimation method of the battery management system for an electric vehicle according to the present invention has the following effects.
첫째, 배터리의 방전 시 전압에 대한 SOC 보상 추정곡선을 이용하여 배터리의 SOC를 실시간으로 보상하므로써 방전전류의 측정시 발생되던 측정오차를 효과적으로 방지하여 정확한 방전전류의 측정이 가능하도록 하는 잇점이 있다.First, it is possible to accurately measure the discharge current by effectively preventing the measurement error generated during the measurement of the discharge current by compensating the SOC of the battery in real time using the SOC compensation estimation curve for the voltage during discharge of the battery.
둘째, 배터리 제조회사로부터 제공되는 방전시 전압에 대한 배터리 특성곡선을 그대로 이용하므로써 배터리 특성곡선을 얻기 위한 노력없이도 SOC에 대한 적절한 보상을 추정할 수 있는 효과가 있다.Second, by using the battery characteristic curve for the discharge voltage provided from the battery manufacturer as it is, it is possible to estimate the appropriate compensation for the SOC without efforts to obtain the battery characteristic curve.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020010069787A KR100673036B1 (en) | 2001-11-09 | 2001-11-09 | Battery state of charge presumed method of battery management system for electric vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020010069787A KR100673036B1 (en) | 2001-11-09 | 2001-11-09 | Battery state of charge presumed method of battery management system for electric vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR20030038992A true KR20030038992A (en) | 2003-05-17 |
| KR100673036B1 KR100673036B1 (en) | 2007-01-22 |
Family
ID=29568748
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020010069787A KR100673036B1 (en) | 2001-11-09 | 2001-11-09 | Battery state of charge presumed method of battery management system for electric vehicle |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR100673036B1 (en) |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006135192A1 (en) * | 2005-06-14 | 2006-12-21 | Lg Chem, Ltd. | Method and apparatus of controlling for charging/discharging voltage of battery |
| KR100749422B1 (en) * | 2006-01-20 | 2007-08-14 | 삼성에스디아이 주식회사 | Battery management system and driving method thereof |
| KR100756836B1 (en) * | 2005-06-30 | 2007-09-07 | 주식회사 엘지화학 | Method for estimating soc of a battery and battery management system using the same |
| KR100804698B1 (en) * | 2006-06-26 | 2008-02-18 | 삼성에스디아이 주식회사 | The method of assuming the state of charge of the battery, battery management system using the method and the driving method of the battery management system using the method |
| KR100823188B1 (en) * | 2006-01-19 | 2008-04-18 | 삼성에스디아이 주식회사 | Battery management system and method for detecting error cell |
| KR100892821B1 (en) * | 2007-11-29 | 2009-04-10 | 현대자동차주식회사 | Method for calculating state of charging in battery |
| WO2012091287A1 (en) * | 2010-12-29 | 2012-07-05 | 주식회사 엘지화학 | Battery pack management device and method involving indicating the degree of degradation of a secondary battery cell, and battery pack including same |
| KR101227417B1 (en) * | 2010-09-14 | 2013-01-29 | 충북대학교 산학협력단 | A method for the SOC estimation of Li-ion battery and a system for its implementation |
| WO2014069863A1 (en) * | 2012-11-01 | 2014-05-08 | 주식회사 엘지화학 | Battery pack test system and method for testing said battery pack |
| KR101432536B1 (en) * | 2013-03-06 | 2014-08-25 | 국방과학연구소 | Soc calcurating method for an integrated battery |
| EP2808690A1 (en) * | 2013-05-27 | 2014-12-03 | Samsung SDI Co., Ltd. | Battery management system and method of driving the same |
| KR20160062193A (en) * | 2014-05-12 | 2016-06-01 | 로베르트 보쉬 게엠베하 | Method for determining the temperature of a battery |
| CN105738824A (en) * | 2016-02-26 | 2016-07-06 | 广州橙行智动汽车科技有限公司 | Method for estimating residual capacity of battery |
| WO2017034277A1 (en) * | 2015-08-21 | 2017-03-02 | 주식회사 엘지화학 | Apparatus and method for estimating degree of aging of secondary battery |
| KR101718333B1 (en) | 2017-01-09 | 2017-03-21 | 홍현정 | Hybrid charging and discharging system |
| CN106597300A (en) * | 2016-11-15 | 2017-04-26 | 深圳天珑无线科技有限公司 | Charging electric quantity calculation method and device |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101065591B1 (en) * | 2008-12-30 | 2011-09-20 | 한국전기연구원 | battery management system for estimating battery state of charge and method thereof |
| KR101097956B1 (en) | 2011-01-21 | 2011-12-22 | 동국대학교 산학협력단 | Apparatus and method for calculating state of charge |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH117984A (en) * | 1997-06-13 | 1999-01-12 | Sony Corp | Capacity detecting method for secondary battery |
| KR100285490B1 (en) * | 1997-12-31 | 2001-04-02 | 정몽규 | Method for measuring residual capacity of battery in electric vehicle |
| KR20000060177A (en) * | 1999-03-12 | 2000-10-16 | 정몽규 | Charging device for compensating output voltage of alterative generator according to it's temperature |
| JP3669202B2 (en) * | 1999-04-20 | 2005-07-06 | 日産自動車株式会社 | Battery status monitoring device |
| JP3674428B2 (en) * | 1999-12-09 | 2005-07-20 | 三菱自動車工業株式会社 | Battery charge control device and battery charge state estimation device |
| KR100391421B1 (en) * | 2000-11-06 | 2003-07-16 | 현대자동차주식회사 | Method for estimating residual energy of battery of electric car |
| KR100395637B1 (en) * | 2000-11-27 | 2003-08-21 | 삼성전자주식회사 | Remaining battery capacity compensator and method of controlling the same |
-
2001
- 2001-11-09 KR KR1020010069787A patent/KR100673036B1/en not_active IP Right Cessation
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006135192A1 (en) * | 2005-06-14 | 2006-12-21 | Lg Chem, Ltd. | Method and apparatus of controlling for charging/discharging voltage of battery |
| KR100756836B1 (en) * | 2005-06-30 | 2007-09-07 | 주식회사 엘지화학 | Method for estimating soc of a battery and battery management system using the same |
| KR100823188B1 (en) * | 2006-01-19 | 2008-04-18 | 삼성에스디아이 주식회사 | Battery management system and method for detecting error cell |
| KR100749422B1 (en) * | 2006-01-20 | 2007-08-14 | 삼성에스디아이 주식회사 | Battery management system and driving method thereof |
| KR100804698B1 (en) * | 2006-06-26 | 2008-02-18 | 삼성에스디아이 주식회사 | The method of assuming the state of charge of the battery, battery management system using the method and the driving method of the battery management system using the method |
| US8008891B2 (en) | 2006-06-26 | 2011-08-30 | Samsung Sdi Co., Ltd. | Simple method for accurately determining a state of charge of a battery, a battery management system using same, and a driving method thereof |
| KR100892821B1 (en) * | 2007-11-29 | 2009-04-10 | 현대자동차주식회사 | Method for calculating state of charging in battery |
| KR101227417B1 (en) * | 2010-09-14 | 2013-01-29 | 충북대학교 산학협력단 | A method for the SOC estimation of Li-ion battery and a system for its implementation |
| US9000732B2 (en) | 2010-12-29 | 2015-04-07 | Lg Chem, Ltd. | Apparatus and method for managing battery pack based on degraded cell |
| WO2012091287A1 (en) * | 2010-12-29 | 2012-07-05 | 주식회사 엘지화학 | Battery pack management device and method involving indicating the degree of degradation of a secondary battery cell, and battery pack including same |
| KR101293635B1 (en) * | 2010-12-29 | 2013-08-05 | 주식회사 엘지화학 | Apparatus and method for managing battery pack based on retrogression degree of secondary electric cell and battery pack using it |
| WO2014069863A1 (en) * | 2012-11-01 | 2014-05-08 | 주식회사 엘지화학 | Battery pack test system and method for testing said battery pack |
| US9267999B2 (en) | 2012-11-01 | 2016-02-23 | Lg Chem, Ltd. | Test system for a battery pack and a method for testing the battery pack |
| KR101432536B1 (en) * | 2013-03-06 | 2014-08-25 | 국방과학연구소 | Soc calcurating method for an integrated battery |
| EP2808690A1 (en) * | 2013-05-27 | 2014-12-03 | Samsung SDI Co., Ltd. | Battery management system and method of driving the same |
| KR20160062193A (en) * | 2014-05-12 | 2016-06-01 | 로베르트 보쉬 게엠베하 | Method for determining the temperature of a battery |
| US9819061B2 (en) | 2014-05-12 | 2017-11-14 | Robert Bosch Gmbh | Method for determining the temperature of a battery |
| WO2017034277A1 (en) * | 2015-08-21 | 2017-03-02 | 주식회사 엘지화학 | Apparatus and method for estimating degree of aging of secondary battery |
| US10534039B2 (en) | 2015-08-21 | 2020-01-14 | Lg Chem, Ltd. | Apparatus and method for estimating degree of aging of secondary battery |
| CN105738824A (en) * | 2016-02-26 | 2016-07-06 | 广州橙行智动汽车科技有限公司 | Method for estimating residual capacity of battery |
| CN105738824B (en) * | 2016-02-26 | 2017-10-17 | 广州橙行智动汽车科技有限公司 | A kind of battery remaining power evaluation method |
| CN106597300A (en) * | 2016-11-15 | 2017-04-26 | 深圳天珑无线科技有限公司 | Charging electric quantity calculation method and device |
| KR101718333B1 (en) | 2017-01-09 | 2017-03-21 | 홍현정 | Hybrid charging and discharging system |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100673036B1 (en) | 2007-01-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100673036B1 (en) | Battery state of charge presumed method of battery management system for electric vehicle | |
| US7466138B2 (en) | Method of structuring comparative reference value used in battery SOC estimating method for dynamic pattern | |
| US7208914B2 (en) | Apparatus and method for predicting the remaining discharge time of a battery | |
| US9766298B2 (en) | Method for estimating state of health of a battery in a hybrid vehicle | |
| KR101500128B1 (en) | Degradation estimation method for high voltage battery | |
| EP1777794B1 (en) | Battery management system and method of determining a state of charge of a battery | |
| EP1843164A1 (en) | Secondary cell charge/discharge electricity amount estimation method and device, secondary cell polarization voltage estimation method and device, and secondary cell remaining capacity estimation method and device | |
| US8046181B2 (en) | Apparatus and method for estimating state of health of battery based on battery voltage variation pattern | |
| US8004243B2 (en) | Battery capacity estimating method and apparatus | |
| KR100911317B1 (en) | Apparatus and method for estimating battery's state of health based on battery voltage variation pattern | |
| US6885951B2 (en) | Method and device for determining the state of function of an energy storage battery | |
| KR100996693B1 (en) | Charged state estimating device and charged state estimating method of secondary battery | |
| US6534954B1 (en) | Method and apparatus for a battery state of charge estimator | |
| JP3379283B2 (en) | Battery state of charge detection method | |
| CN100428559C (en) | Method and apparatus for estimating state of charge of secondary battery | |
| KR102080632B1 (en) | Battery management system and its operating method | |
| US20150303532A1 (en) | Battery System and Associated Method for Determining the Internal Resistance of Battery Cells or Battery Modules of Said Battery System | |
| CA2697011A1 (en) | Apparatus for estimating open circuit voltage of battery, apparatus for estimating state of charge of battery, and method for controlling the same | |
| JP2012189373A (en) | Secondary battery condition detection device and secondary battery condition detection method | |
| KR20160097243A (en) | Assessing the quantity of energy in a motor vehicle battery | |
| KR20140123838A (en) | System and method for restarting voltage prediction of vehicle | |
| Pop et al. | State-of-charge indication in portable applications | |
| EP1736789A1 (en) | Method and equipment for estimating residual capacity of storage battery | |
| JP2008256436A (en) | Approximate expression calculation apparatus and its method, and battery state monitoring device | |
| JP4668015B2 (en) | Secondary battery state detection method and secondary battery state detection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A201 | Request for examination | ||
| E902 | Notification of reason for refusal | ||
| E701 | Decision to grant or registration of patent right | ||
| GRNT | Written decision to grant | ||
| FPAY | Annual fee payment |
Payment date: 20120113 Year of fee payment: 7 |
|
| FPAY | Annual fee payment |
Payment date: 20140212 Year of fee payment: 9 |
|
| LAPS | Lapse due to unpaid annual fee |