Earticle

초록

영어

As electric vehicles spread, electric vehicle fires continue to occur. The main cause of these electric vehicle fires is battery overload caused by battery management system (BMS) malfunction. Existing BMS measures the voltage of the battery by physically connecting each battery cell and the controller, but in electric vehicles, the battery operates up to 1,000V or more. In this high-voltage environment, the BMS, which is the circuit that manages the battery, operates at a low voltage of 5V or less. Therefore, if a high battery voltage has an incorrect effect on the BMS board operating at a low voltage, the BMS board is destroyed, leading to battery malfunction and battery explosion. In order to compensate for these problems, indirect measurement technology that physically isolates the battery cell and the low-voltage control board is important. The indirect measurement method of the isolation structure obtained in previous research for safe battery voltage measurement resulted in battery cell voltage monitoring results of several mV to tens of mV due to errors due to device imbalance and temperature characteristics of the battery cells found in the parallel structure. To solve this problem, we were able to overcome inaccurate battery cell voltage monitoring results due to device imbalance and temperature characteristic differences at once by sequentially monitoring the battery voltage of all battery cells through a single indirect measurement path. In the process of recognizing battery cell voltage, changes in monitoring voltage depending on temperature must be compensated. However, the existing temperature compensation circuit used a temperature sensor to compensate for the temperature with a resistance value, but accurate compensation was difficult. In this paper, in order to accurately compensate for temperature, the reference voltage (REF_V) was created internally by dividing it into 15 steps from 4.2V to 3.2V, and the temperature can be compensated by applying the voltage (REF_V), so the battery voltage can be recognized accurately at any temperature. I could do it. Additionally, the internal clock oscillator that generates the clock internally is designed to operate at 1khz. As a result of the design, temperature compensation was performed on 16 battery cells, and when operating at an internal clock of 1khz, all 16 battery cells and reference voltages could be monitored in 2 seconds. The research results of this paper automatically generate temperature compensation. voltage REF_V and battery cell voltage along with code values, allowing BMS operation to be accurately known without CPU control.

목차

Abstract
1. Introduction
2. Materials and Methods
2.1. MULTI-CELL SINGLE-PATH BMS DESIGN
2.2. HIGH RESOLUTION REFERENCE VOLTAGE CIRCUIT DESIGN
2.3. TEMPERATURE COMPENSATION ALGORITHM
3. Conclusions
References

키워드

저자

• Wanhae Jeon [ Dept. of advanced Automotive Eng. Sun Moon University, Asan 31460, Korea ]
• Hikasa Akio [ Dept. of advanced Automotive Eng. Sun Moon University, Asan 31460, Korea ]
• Dakayuki Yokoi [ JPC Automotive, deajeon, Korea ]
• Paul Jeremia [ Dept. of advanced Automotive Eng. Sun Moon University, Asan 31460, Korea ]
• Innyeal Oh [ Dept. of advanced Automotive Eng. Sun Moon University, Asan 31460, Korea ] Corresponding Author

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  선문효정학술연구회 학술대회 프로시딩

• 간기

  반년간

• 수록기간

  2023~2026

• 십진분류

  KDC 238 DDC 289