KR102394627B1 - Control Method for EV's Battery Charging - Google Patents
Control Method for EV's Battery Charging Download PDFInfo
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- KR102394627B1 KR102394627B1 KR1020170101630A KR20170101630A KR102394627B1 KR 102394627 B1 KR102394627 B1 KR 102394627B1 KR 1020170101630 A KR1020170101630 A KR 1020170101630A KR 20170101630 A KR20170101630 A KR 20170101630A KR 102394627 B1 KR102394627 B1 KR 102394627B1
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- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
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- 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]
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- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
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- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/11—DC charging controlled by the charging station, e.g. mode 4
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
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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
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- 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
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- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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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]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- 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
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- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/547—Voltage
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- B60—VEHICLES IN GENERAL
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Abstract
본 발명은 배터리 내 이상 열화셀 발생시 배터리 충전성능을 확보하기 위한 전기차용 배터리 충전 제어방법에 관한 것으로, CP 또는 CC 충전 단계, 이상 열화셀 판단 및 CV 충전 단계, 배터리 진단 및 충전 종료 단계를 순차적으로 수행하며, CP 또는 CC 충전 중 이상 열화셀에 의한 CV 진입을 방지하여 배터리의 충전성능이 저하되지 않도록 한 것을 특징으로 한다.
본 발명에 따른 전기차용 배터리 충전 제어방법은 이상 열화셀에 의한 CV 진입을 방지함으로써 배터리의 충전성능 저하없이 충전이 가능하도록 한다. 이에 따라, 차량의 성능 및 연비가 저하되지 않도록 유효하게 배터리를 사용할 수 있다.The present invention relates to a battery charging control method for an electric vehicle for securing battery charging performance when abnormally deteriorated cells in the battery occur, in which CP or CC charging steps, determining abnormally deteriorated cells and CV charging steps, battery diagnosis and charging termination steps are sequentially performed It is characterized in that the charging performance of the battery is not deteriorated by preventing CV entry by abnormally deteriorated cells during CP or CC charging.
The battery charging control method for an electric vehicle according to the present invention enables charging without deterioration of the charging performance of the battery by preventing the CV from entering due to abnormally deteriorated cells. Accordingly, it is possible to effectively use the battery so that the performance and fuel efficiency of the vehicle are not deteriorated.
Description
본 발명은 전기차용 배터리 충전 제어방법에 관한 것으로, 보다 상세하게는 배터리 내 이상 열화셀 발생시 배터리 충전성능을 확보하기 위한 전기차용 배터리 충전 제어방법에 관한 것이다.The present invention relates to a method for controlling charging of a battery for an electric vehicle, and more particularly, to a method for controlling charging of a battery for an electric vehicle for securing battery charging performance when abnormally deteriorated cells occur in a battery.
친환경차에서 배터리의 역할은 매우 중요하다. 특히, 전기차의 경우 배터리의 열화에 따라 충전성능 및 연비가 저하되게 되는데, 배터리는 열화에 따라 셀 내부의 저항이 증가하게 되므로 배터리의 보호를 위해 CP(Constant Power) 또는 CC(Constant Current) 충전 중 셀전압이 제어전략적으로 수립해 놓은 일정 전압에 도달하게 되면 CV(Constant Voltage) 충전으로 진입하도록 제어하고 있다.The role of batteries in eco-friendly vehicles is very important. In particular, in the case of an electric vehicle, the charging performance and fuel efficiency are lowered according to the deterioration of the battery. As the battery deteriorates, the internal resistance of the cell increases, so CP (Constant Power) or CC (Constant Current) is being charged to protect the battery. When the cell voltage reaches a certain voltage established as a control strategy, it is controlled to enter into CV (Constant Voltage) charging.
하지만, 이러한 종래의 충전 제어방법은 배터리 내 특정 셀의 비정상적인 열화가 발생하는 경우 본의 아니게 배터리 전체의 충전성능을 저하시키게 된다.However, this conventional charging control method unintentionally degrades the charging performance of the entire battery when abnormal deterioration of a specific cell in the battery occurs.
도 1은 배터리 내 이상 열화가 발생한 특정 셀 존재시 배터리 충전성능의 저하 사례를 도시한 도면이다. 도 1의 (a)를 참조하면, 이상 열화가 발생한 특정 셀은 방전시 다른 정상적인 열화셀과 대비하여 전압 변화가 큰 특징이 있다. 이러한 이상 열화셀이 존재하는 경우, 도 1의 (b)에서 볼 수 있는 바와 같이, 충전시 이상 열화가 발생한 특정 셀이 CV 진입 상한전압에 걸려서 만충전이 되지 못하고 충전이 종료되게 된다. 즉, 종래의 충전 제어방법은 비정상적인 이상셀의 전압값에 의해 배터리 충전에 제한이 발생하게 되고, 이상셀을 제외한 나머지 셀들은 정상적인 수준임에도 불구하고 배터리의 충전을 제한하게 되는 불합리한 제어를 하게 되는 것이다.1 is a diagram illustrating an example of a decrease in battery charging performance when a specific cell in which abnormal deterioration occurs is present in the battery. Referring to FIG. 1A , a specific cell in which abnormal deterioration occurs has a large voltage change during discharge compared to other normally deteriorated cells. When such abnormally deteriorated cells exist, as can be seen in FIG. 1(b) , a specific cell that has abnormally deteriorated during charging is hit by the CV entry upper limit voltage, so that it cannot be fully charged and charging is terminated. That is, in the conventional charging control method, the battery charging is limited by the voltage value of the abnormal cell, and the remaining cells except for the abnormal cell are unreasonably controlled to limit the charging of the battery even though it is at a normal level. .
이러한 불합리한 제어에 따른 배터리 전체의 충전성능 저하는 결국 차량이 모터로만 주행하는 CD(Charge Depleting)구간 주행거리의 단축을 유발시키게 되어 전기차의 성능 및 연비를 크게 저하시키게 된다.The decrease in the charging performance of the entire battery due to such unreasonable control eventually causes a shortening of the mileage in the CD (Charge Depleting) section in which the vehicle is driven only by the motor, thereby greatly reducing the performance and fuel efficiency of the electric vehicle.
본 발명은 위와 같은 문제점을 해결하기 위하여 안출된 것으로, 본 발명의 목적은 이상 열화셀에 의한 CV 진입을 방지함으로써 배터리의 충전성능 저하없이 충전이 가능하도록 한 전기차용 배터리 충전 제어방법을 제공하는데 있다.The present invention has been devised to solve the above problems, and an object of the present invention is to provide a method for controlling the charging of a battery for an electric vehicle that enables charging without deterioration of the charging performance of the battery by preventing CV entry by abnormally deteriorated cells. .
위와 같은 과제를 해결하기 위한 본 발명에 따른 전기차용 배터리 충전 제어방법은 CP 또는 CC 충전 단계, 이상 열화셀 판단 및 CV 충전 단계, 배터리 진단 및 충전 종료 단계를 순차적으로 수행하며, CP 또는 CC 충전 중 이상 열화셀에 의한 CV 진입을 방지하여 배터리의 충전성능이 저하되지 않도록 한 것을 특징으로 한다.The battery charging control method for an electric vehicle according to the present invention for solving the above problems sequentially performs the CP or CC charging step, abnormally deteriorated cell determination and CV charging step, battery diagnosis and charging termination step, and during CP or CC charging It is characterized in that the charging performance of the battery is not deteriorated by preventing the entry of the CV by the abnormally deteriorated cell.
상기 CP 또는 CC 충전 단계는 배터리를 완속충전(CP) 또는 급속충전(CC)으로 충전한다.The CP or CC charging step charges the battery by slow charging (CP) or rapid charging (CC).
상기 이상 열화셀 판단 및 CV 충전 단계는 상기 CP 또는 CC 충전 중 제일 높은 셀전압이 CV 진입 전압에 도달하면, 배터리의 BMS 전셀 전압을 사용하여 최고 전압셀과 그 다음으로 높은 전압셀의 전압 차이를 확인하고, 그 차이가 일정 전압값으로 설정된 기준값 이하이면 배터리 셀의 전체적인 일반적 열화로 판단하여 CV 충전으로 진입할 수 있다.In the abnormally deteriorated cell determination and CV charging step, when the highest cell voltage among the CP or CC charging reaches the CV entry voltage, the voltage difference between the highest voltage cell and the next highest voltage cell is measured using the BMS total cell voltage of the battery. After checking, if the difference is less than a reference value set as a constant voltage value, it is determined that the general deterioration of the battery cell is determined and CV charging can be performed.
또한, 상기 전압 차이가 설정된 기준값 이상이면 최고 전압에 해당하는 셀에 이상 열화가 발생한 것으로 판단하여 바로 CV 충전으로 진입하지 않고 두 번째 높은 셀전압이 CV 진입 전압에 도달할 때까지 CP 또는 CC 충전을 지속할 수 있다.In addition, if the voltage difference is greater than or equal to the set reference value, it is determined that abnormal deterioration has occurred in the cell corresponding to the highest voltage, and instead of directly entering CV charging, CP or CC charging is performed until the second high cell voltage reaches the CV entry voltage. can last
상기 기준값은 0.12V 내지 0.2V의 범위 내에서 설정될 수 있다.The reference value may be set within the range of 0.12V to 0.2V.
상기 배터리 진단 및 충전 종료 단계는 일반 충전 종료 조건 도달시 충전을 종료하거나, CV 충전 중 BMS에서 사용 가능한 최대 상한 전압에 최고 전압셀의 전압값이 도달시 배터리 진단과 동시에 충전을 종료하도록 할 수 있다.In the battery diagnosis and charging termination step, charging is terminated when the general charging termination condition is reached, or when the voltage value of the highest voltage cell reaches the maximum upper limit voltage available in the BMS during CV charging, charging can be terminated simultaneously with battery diagnosis. .
본 발명에 따른 전기차용 배터리 충전 제어방법은 이상 열화셀에 의한 CV 진입을 방지함으로써 배터리의 충전성능 저하없이 충전이 가능하도록 한다. 이에 따라, 차량의 성능 및 연비가 저하되지 않도록 유효하게 배터리를 사용할 수 있다.The battery charging control method for an electric vehicle according to the present invention enables charging without deterioration of the charging performance of the battery by preventing the CV from entering due to abnormally deteriorated cells. Accordingly, it is possible to effectively use the battery so that the performance and fuel efficiency of the vehicle are not deteriorated.
또한, 차량의 주행거리가 증가함에 따라 이상 셀의 열화가 증가하여 더이상 사용하기 어려운 수준에 도달시에도 진단로직에 의해 배터리의 안전성을 확보할 수 있다.In addition, as the mileage of the vehicle increases, the battery safety can be secured by the diagnostic logic even when the deterioration of the abnormal cell increases and reaches a level that is no longer usable.
도 1은 배터리 내 이상 열화가 발생한 특정 셀 존재시 배터리 충전성능의 저하 사례를 도시한 도면이다.
도 2는 본 발명에 따른 전기차용 배터리 충전 제어방법의 순서도이다.1 is a diagram illustrating an example of a decrease in battery charging performance when a specific cell in which abnormal deterioration occurs is present in the battery.
2 is a flowchart of a method for controlling charging of a battery for an electric vehicle according to the present invention.
아래에서는 본 발명에 따른 전기차용 배터리 충전 제어방법을 첨부된 도면을 참조하여 상세히 설명한다. 다만, 본 발명의 요지를 불필요하게 흐릴 수 있는 공지 기능 및 구성에 대한 상세한 설명은 생략한다.Hereinafter, a method for controlling battery charging for an electric vehicle according to the present invention will be described in detail with reference to the accompanying drawings. However, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the gist of the present invention will be omitted.
도 2는 본 발명에 따른 전기차용 배터리 충전 제어방법의 순서도이다. 도 2를 참조하면, 본 발명에 따른 전기차용 배터리 충전 제어방법은 CP 또는 CC 충전 단계(S100), 이상 열화셀 판단 및 CV 충전 단계(S200), 배터리 진단 및 충전 종료 단계(S300)를 포함한다.2 is a flowchart of a method for controlling charging of a battery for an electric vehicle according to the present invention. Referring to FIG. 2 , the method for controlling charging of a battery for an electric vehicle according to the present invention includes a CP or CC charging step (S100), an abnormally deteriorated cell determination and CV charging step (S200), and a battery diagnosis and charging termination step (S300). .
상기 CP 또는 CC 충전 단계(S100)는 배터리를 완속충전(CP) 또는 급속충전(CC)으로 충전하는 단계이다.The CP or CC charging step (S100) is a step of charging the battery by slow charging (CP) or rapid charging (CC).
상기 이상 열화셀 판단 및 CV 충전 단계(S200)는 상기 CP 또는 CC 충전 중 제일 높은 셀전압(Vmax_1)이 CV 진입 전압에 도달하면(S210), 배터리의 BMS(Battery Management System) 전셀 전압을 사용하여 최고 전압셀(Vmax_1)과 그 다음으로 높은 전압셀(Vmax_2)의 전압 차이를 확인하고(S220), 그 차이가 일정 전압값(0.12~0.2V)으로 설정된 기준값(A) 이하이면 배터리 셀의 전체적인 일반적 열화로 판단하여 CV 충전으로 진입하고(S250), 설정된 기준값(A) 이상이면 최고 전압(Vmax_1)에 해당하는 셀에 이상 열화가 발생한 것으로 판단하여 바로 CV 충전으로 진입하지 않고 두 번째 높은 셀전압(Vmax_2)이 CV 진입 전압에 도달할 때까지 CP 또는 CC 충전을 지속하는(S230 및 S240) 단계이다.In the abnormally deteriorated cell determination and CV charging step (S200), when the highest cell voltage (V max_1 ) among the CP or CC charging reaches the CV entry voltage (S210), the BMS (Battery Management System) all-cell voltage of the battery is used to check the voltage difference between the highest voltage cell (V max_1 ) and the next highest voltage cell (V max_2 ) (S220), and if the difference is less than the reference value (A) set as a constant voltage value (0.12 to 0.2V), the battery Judging by the overall general deterioration of the cell, it enters into CV charging (S250), and if it is higher than the set reference value (A), it is judged that abnormal deterioration has occurred in the cell corresponding to the highest voltage (V max_1 ) and does not immediately enter CV charging. The CP or CC charging is continued (S230 and S240) until the th highest cell voltage (V max_2 ) reaches the CV entry voltage.
상기 배터리 진단 및 충전 종료 단계(S300)는 일반 충전 종료 조건 도달시 충전을 종료하거나(S330), CV 충전 중 BMS에서 사용 가능한 최대 상한 전압(B)에 최고 전압셀의 전압값(Vmax_1)이 도달시(S310), 차량의 주행거리가 증가하면서 셀의 열화가 증가하여 배터리 진단이 필요한 경우로 판단하여, 배터리 진단과 동시에 충전을 종료하도록 하는(S320) 단계이다.The battery diagnosis and charging termination step (S300) ends charging when the general charging termination condition is reached (S330), or the voltage value of the highest voltage cell (V max_1 ) to the maximum upper limit voltage (B) available in the BMS during CV charging. Upon arrival (S310), as the mileage of the vehicle increases, it is determined that the battery diagnosis is necessary due to the increase in cell degradation, and the charging is terminated at the same time as the battery diagnosis (S320).
이상과 같은 본 발명에 따른 전기차용 배터리 충전 제어방법에 의하면, 이상 열화셀에 의한 CV 진입을 방지함으로써 배터리의 충전성능 저하없이 충전이 가능하도록 하며, 이에 따라 차량의 성능(일회 충전 주행거리) 및 연비가 저하되지 않도록 유효하게 배터리를 사용할 수 있게 된다.According to the battery charging control method for an electric vehicle according to the present invention as described above, it is possible to charge without deterioration of the charging performance of the battery by preventing the entry of the CV by the abnormally deteriorated cell, and accordingly, the vehicle performance (one-time charge mileage) and The battery can be used effectively so that fuel efficiency is not reduced.
또한, 차량의 주행거리가 증가함에 따라 셀의 열화가 증가하여 더이상 사용하기 어려운 수준(BMS에서 허용하는 셀 최대 상한 전압)에 도달시에는 진단로직에 의하여 배터리의 안전성을 확보할 수 있게 된다.In addition, when the cell degradation increases as the vehicle mileage increases and reaches a level that is no longer usable (the maximum cell maximum voltage allowed by the BMS), the safety of the battery can be secured by the diagnostic logic.
S100: CP 또는 CC 충전 단계
S200: 이상 열화셀 판단 및 CV 충전 단계
S210: 최고 셀전압이 CV 진입 전압에 도달하였는지 판단하는 단계
S220: 최고 셀전압과 두 번째 높은 셀전압의 차이가 기준값 이상인지 판단하는 단계
S230: CP 또는 CC 충전 지속 단계
S240: 두 번째 높은 셀전압이 CV 진입 전압에 도달하였는지 판단하는 단계
S250: CV 충전 단계
S300: 배터리 진단 및 충전 종료 단계
S310: 최고 셀전압이 BMS의 최대 상한 전압 이상인지 판단하는 단계
S320: 배터리 진단 적용 및 충전 종료 단계
S330: 일반 충전 종료 조건 도달시 충전 종료 단계S100: CP or CC charging stage
S200: Determination of abnormally deteriorated cells and CV charging step
S210: Step of determining whether the highest cell voltage has reached the CV entry voltage
S220: determining whether the difference between the highest cell voltage and the second highest cell voltage is equal to or greater than a reference value
S230: CP or CC charge continuous phase
S240: Step of determining whether the second high cell voltage has reached the CV entry voltage
S250: CV charging stage
S300: Battery Diagnosis and Charging Termination Phase
S310: Step of determining whether the highest cell voltage is greater than or equal to the maximum upper limit voltage of the BMS
S320: Battery diagnostic application and charging termination phase
S330: Charging end stage when normal charging end condition is reached
Claims (10)
상기 이상 열화셀 판단 및 CV 충전 단계는,
상기 CP 또는 CC 충전 중 제일 높은 셀전압이 CV 진입 전압에 도달하면, 배터리의 BMS 전셀 전압을 사용하여 최고 전압셀과 그 다음으로 높은 전압셀의 전압 차이를 확인하고, 그 차이가 일정 전압값으로 설정된 기준값 이하이면 배터리 셀의 전체적인 일반적 열화로 판단하여 CV 충전으로 진입하고,
상기 전압 차이가 설정된 기준값 이상이면 최고 전압에 해당하는 셀에 이상 열화가 발생한 것으로 판단하여 바로 CV 충전으로 진입하지 않고 두 번째 높은 셀전압이 CV 진입 전압에 도달할 때까지 CP 또는 CC 충전을 지속하는 것을 특징으로 하는 전기차용 배터리 충전 제어방법. CP or CC charging stage, abnormally deteriorated cell determination and CV charging stage, battery diagnosis and charging termination stage are sequentially performed,
The abnormally deteriorated cell determination and CV charging step,
When the highest cell voltage reaches the CV entry voltage during the CP or CC charging, the voltage difference between the highest voltage cell and the next highest voltage cell is checked using the BMS total cell voltage of the battery, and the difference is converted to a constant voltage value. If it is less than the set reference value, it is judged as overall general deterioration of the battery cell and enters into CV charging,
If the voltage difference is greater than or equal to the set reference value, it is determined that abnormal deterioration has occurred in the cell corresponding to the highest voltage, and the CP or CC charging is continued until the second high cell voltage reaches the CV entry voltage without directly entering CV charging. Battery charging control method for an electric vehicle, characterized in that.
상기 CP 또는 CC 충전 단계는 배터리를 완속충전(CP) 또는 급속충전(CC)으로 충전하는 것을 특징으로 하는 전기차용 배터리 충전 제어방법.The method according to claim 1,
The CP or CC charging step is a battery charging control method for an electric vehicle, characterized in that charging the battery by slow charging (CP) or rapid charging (CC).
상기 기준값은 0.12V 내지 0.2V의 범위 내에서 설정되는 것을 특징으로 하는 전기차용 배터리 충전 제어방법.The method according to claim 1,
The reference value is a battery charging control method for an electric vehicle, characterized in that set within the range of 0.12V to 0.2V.
상기 배터리 진단 및 충전 종료 단계는 일반 충전 종료 조건 도달시 충전을 종료하거나, CV 충전 중 BMS에서 사용 가능한 최대 상한 전압에 최고 전압셀의 전압값이 도달시 배터리 진단과 동시에 충전을 종료하도록 하는 것을 특징으로 하는 전기차용 배터리 충전 제어방법.The method according to claim 1,
In the battery diagnosis and charging termination step, charging is terminated when a general charging termination condition is reached, or when the voltage value of the highest voltage cell reaches the maximum upper limit voltage available in the BMS during CV charging, charging is terminated at the same time as battery diagnosis. A method for controlling battery charging for electric vehicles.
CP 또는 CC 충전 중 이상 열화셀에 의한 CV 진입을 방지하여 배터리의 충전성능이 저하되지 않도록 하는 이상 열화셀 판단 및 CV 충전 단계; 및
일반 충전 종료 조건 도달시 충전을 종료하거나, CV 충전 중 BMS에서 사용 가능한 최대 상한 전압에 최고 전압셀의 전압값이 도달시 배터리 진단과 동시에 충전을 종료하도록 하는 배터리 진단 및 충전 종료 단계; 를 순차적으로 수행하고,
상기 이상 열화셀 판단 및 CV 충전 단계는,
상기 CP 또는 CC 충전 중 제일 높은 셀전압이 CV 진입 전압에 도달하면, 배터리의 BMS 전셀 전압을 사용하여 최고 전압셀과 그 다음으로 높은 전압셀의 전압 차이를 확인하고, 그 차이가 일정 전압값으로 설정된 기준값 이하이면 배터리 셀의 전체적인 일반적 열화로 판단하여 CV 충전으로 진입하고,
상기 전압 차이가 설정된 기준값 이상이면 최고 전압에 해당하는 셀에 이상 열화가 발생한 것으로 판단하여 바로 CV 충전으로 진입하지 않고 두 번째 높은 셀전압이 CV 진입 전압에 도달할 때까지 CP 또는 CC 충전을 지속하는 것을 특징으로 하는 전기차용 배터리 충전 제어방법.CP or CC charging step of charging the battery with slow charging (CP) or rapid charging (CC);
Determining abnormally deteriorated cells and charging CV to prevent the charging performance of the battery from being deteriorated by preventing CV entry by abnormally deteriorated cells during CP or CC charging; and
A battery diagnosis and charging termination step of terminating charging when the general charging termination condition is reached, or terminating charging at the same time as battery diagnosis when the voltage value of the highest voltage cell reaches the maximum upper limit voltage available in the BMS during CV charging; are performed sequentially,
The abnormally deteriorated cell determination and CV charging step,
When the highest cell voltage reaches the CV entry voltage during the CP or CC charging, the voltage difference between the highest voltage cell and the next highest voltage cell is checked using the BMS total cell voltage of the battery, and the difference is converted to a constant voltage value. If it is less than the set reference value, it is judged as overall general deterioration of the battery cell and enters into CV charging,
If the voltage difference is greater than or equal to the set reference value, it is determined that abnormal deterioration has occurred in the cell corresponding to the highest voltage, and the CP or CC charging is continued until the second high cell voltage reaches the CV entry voltage without directly entering CV charging. Battery charging control method for an electric vehicle, characterized in that.
CV 충전 중 BMS에서 사용 가능한 최대 상한 전압에 최고 전압셀의 전압값이 도달시, 차량의 주행거리가 증가하면서 셀의 열화가 증가하여 배터리 진단이 필요한 경우로 판단하는 것을 특징으로 하는 전기차용 배터리 충전 제어방법.8. The method of claim 7,
Battery charging for electric vehicle, characterized in that when the voltage value of the highest voltage cell reaches the maximum upper limit voltage that can be used in the BMS during CV charging, the deterioration of the cell increases as the mileage of the vehicle increases and battery diagnosis is required. control method.
상기 기준값은 0.12V 내지 0.2V의 범위 내에서 설정되는 것을 특징으로 하는 전기차용 배터리 충전 제어방법.8. The method of claim 7,
The reference value is a battery charging control method for an electric vehicle, characterized in that set within the range of 0.12V to 0.2V.
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