High efficiency battery management system for serially connected battery string

Karnjanapiboon, Charnyut; Jirasereeamornkul, Kamon; Monyakul, Veerapol

doi:10.1109/isie.2009.5214247

Cited by 37 publications

(21 citation statements)

References 7 publications

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“…Many balancing topologies have been studied recently [3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Several popular balancing topologies are described and analyzed in this section.…”

Section: The Proposed Balancing Topologymentioning

confidence: 99%

SOC Based Battery Cell Balancing with a Novel Topology and Reduced Component Count

Xu¹,

Mi³

et al. 2013

Energies

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This paper proposes a novel battery cell balancing topology with reduced component count and simplified control. The balancing algorithm is based on the state of charge (SOC) of each individual cell instead of cell voltage. The principle of the proposed topology is analyzed and verified through simulation and experiments. Then an experimental battery test workbench is established to validate the proposed balancing algorithm. The experimental results show that the proposed balancing topology and associated algorithm can perform well in real applications.

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“…Many balancing topologies have been studied recently [3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Several popular balancing topologies are described and analyzed in this section.…”

Section: The Proposed Balancing Topologymentioning

confidence: 99%

SOC Based Battery Cell Balancing with a Novel Topology and Reduced Component Count

Xu¹,

Mi³

et al. 2013

Energies

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“…Refs. [31]- [33] introduced a DC-linked technique to achieve an improvement in the efficiency of the transfer of energy between battery modules in an SCBS with a modular design.…”

Section: Introductionmentioning

confidence: 99%

“…The efficiency was moderate because the total transfer energy was a result of multiplying the two converter efficiencies. To better understand these traditional balancing processes, a three-dimensional efficiency transfer graph was analyzed [31].…”

Section: Introductionmentioning

confidence: 99%

Low-Voltage-Stress AC-Linked Charge Equalizing System for Series-Connected VRLA Battery Strings

Karnjanapiboon¹,

Jirasereeamornkul²,

Monyakul³

2013

Journal of Power Electronics

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This paper presents a low voltage-stress AC-linked charge equalizing system for balancing the energy in a serially connected, valve-regulated lead acid battery string using a modular converter that consists of multiple transformers coupled together. Each converter was coupled through an AC-linked bus to increase the overall energy transfer efficiency of the system and to eliminate the problem of the unbalanced charging of batteries. Previous solutions are based on centralized and modularized topologies. A centralized topology requires a redesign of the hardware and related components. It also faces a high voltage stress when the number of batteries is expanded. Modularized solutions use low-voltage-stress, double-stage, DC-linked topologies which leads to poor energy transfer efficiency. The proposed solution uses a low-voltage stress, AC-linked, modularized topology that makes adding more batteries easier. It also has a better energy transfer efficiency. To ensure that the charge equalization system operates smoothly and safely charges batteries, a small intelligent microcontroller was used in the control section. The efficiency of this charge equalization system is 85%, which is 21% better than other low-voltage-stress DC-linked charging techniques. The validity of this approach was confirmed by experimental results.

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“…능동형 셀 밸런싱 회로는 전하 전달 방식에 따라 간 접 전달 방식 [4]- [6] 과 직접 전달 방식 [1], [7]- [15] 으로 나눌 수 있다. 간접 전달 방식은 인접하지 않은 배터리 셀로 의 직접적인 전하 전달이 불가능하여 직렬 연결하는 배 터리 셀의 수에 비례하여 밸런싱을 위한 시간이 길어지 는 단점이 있다.…”

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“…직접 전달방식은 인접하지 않은 배터리 셀로 직접적인 전하 전달이 가능하여 직렬 연결된 배터 리 셀의 수와 관계없이 빠른 균일화 속도를 낼 수 있다. 직접 전달 방식은 각 배터리 셀당 개별 컨버터를 연 결하여 사용하는 방법 [7]- [11] 과 다권선 변압기를 이용하여 하나의 코어를 여러 개의 배터리 셀이 공유하여 사용하 는 방법 [1], [12]- [15] 으로 나눌 수 있다. 개별 컨버터를 이용 하는 방식은 배터리 셀의 충방전 속도는 매우 빠르지만, 배터리 수와 비례하여 시스템의 크기 및 구현 비용이 증가한다.…”

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A Novel Cell Balancing Circuit for Fast Charge Equalization

Park¹,

Choi²,

Kim³

et al. 2015

The Transactions of the Korean Institute of Power Electronics

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This study proposes an improved cell balancing circuit for fast equalization among lithium-ion (Li-ion) batteries. A simple voltage sensorless charge balancing circuit has been proposed in the past [1] . This cell balancing circuit automatically transfers energy from high-to low-voltage battery cells. However, the circuit requires a switch with low on-resistance because the balancing speed is limited by the on-resistance of the switch. Balancing speed decreases as the voltage difference among the battery cells decrease. In this study, the balancing speed of the cell balancing circuit is enhanced by using the auxiliary circuit, which boosts the balancing current. The charging current is determined by the nominal battery cell voltage and thus, the balancing speed is almost constant despite the very small voltage differences among the batteries. Simulation results are provided to verify the validity of the proposed cell balancing circuit.

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High efficiency battery management system for serially connected battery string

Cited by 37 publications

References 7 publications

SOC Based Battery Cell Balancing with a Novel Topology and Reduced Component Count

SOC Based Battery Cell Balancing with a Novel Topology and Reduced Component Count

Low-Voltage-Stress AC-Linked Charge Equalizing System for Series-Connected VRLA Battery Strings

A Novel Cell Balancing Circuit for Fast Charge Equalization

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