A Cell-to-Cell Equalizer Based on Three-Resonant-State Switched-Capacitor Converters for Series-Connected Battery Strings
Due to the low cost, small size, and ease of control, the switched-capacitor (SC) battery equalizers are promising among active balancing methods. However, it is difficult to achieve the full cell equalization for the SC equalizers due to the inevitable voltage drops across Metal-Oxide-Semiconductor...
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| Format: | Article |
| Language: | English |
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MDPI AG
2017-02-01
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| Series: | Energies |
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| Online Access: | http://www.mdpi.com/1996-1073/10/2/206 |
| _version_ | 1798043180822691840 |
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| author | Yunlong Shang Qi Zhang Naxin Cui Chenghui Zhang |
| author_facet | Yunlong Shang Qi Zhang Naxin Cui Chenghui Zhang |
| author_sort | Yunlong Shang |
| collection | DOAJ |
| description | Due to the low cost, small size, and ease of control, the switched-capacitor (SC) battery equalizers are promising among active balancing methods. However, it is difficult to achieve the full cell equalization for the SC equalizers due to the inevitable voltage drops across Metal-Oxide-Semiconductor Field Effect Transistor (MOSFET) switches. Moreover, when the voltage gap among cells is larger, the balancing efficiency is lower, while the balancing speed becomes slower as the voltage gap gets smaller. In order to soften these downsides, this paper proposes a cell-to-cell battery equalization topology with zero-current switching (ZCS) and zero-voltage gap (ZVG) among cells based on three-resonant-state SC converters. Based on the conventional inductor-capacitor (LC) converter, an additional resonant path is built to release the charge of the capacitor into the inductor in each switching cycle, which lays the foundations for obtaining ZVG among cells, improves the balancing efficiency at a large voltage gap, and increases the balancing speed at a small voltage gap. A four-lithium-ion-cell prototype is applied to validate the theoretical analysis. Experiment results demonstrate that the proposed topology has good equalization performances with fast equalization, ZCS, and ZVG among cells. |
| first_indexed | 2024-04-11T22:45:55Z |
| format | Article |
| id | doaj.art-12e2ffbe55ba47dda0263ea162011ff5 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T22:45:55Z |
| publishDate | 2017-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-12e2ffbe55ba47dda0263ea162011ff52022-12-22T03:58:45ZengMDPI AGEnergies1996-10732017-02-0110220610.3390/en10020206en10020206A Cell-to-Cell Equalizer Based on Three-Resonant-State Switched-Capacitor Converters for Series-Connected Battery StringsYunlong Shang0Qi Zhang1Naxin Cui2Chenghui Zhang3School of Control Science and Engineering, Shandong University, Jinan 250061, ChinaSchool of Control Science and Engineering, Shandong University, Jinan 250061, ChinaSchool of Control Science and Engineering, Shandong University, Jinan 250061, ChinaSchool of Control Science and Engineering, Shandong University, Jinan 250061, ChinaDue to the low cost, small size, and ease of control, the switched-capacitor (SC) battery equalizers are promising among active balancing methods. However, it is difficult to achieve the full cell equalization for the SC equalizers due to the inevitable voltage drops across Metal-Oxide-Semiconductor Field Effect Transistor (MOSFET) switches. Moreover, when the voltage gap among cells is larger, the balancing efficiency is lower, while the balancing speed becomes slower as the voltage gap gets smaller. In order to soften these downsides, this paper proposes a cell-to-cell battery equalization topology with zero-current switching (ZCS) and zero-voltage gap (ZVG) among cells based on three-resonant-state SC converters. Based on the conventional inductor-capacitor (LC) converter, an additional resonant path is built to release the charge of the capacitor into the inductor in each switching cycle, which lays the foundations for obtaining ZVG among cells, improves the balancing efficiency at a large voltage gap, and increases the balancing speed at a small voltage gap. A four-lithium-ion-cell prototype is applied to validate the theoretical analysis. Experiment results demonstrate that the proposed topology has good equalization performances with fast equalization, ZCS, and ZVG among cells.http://www.mdpi.com/1996-1073/10/2/206battery equalizersbattery management systemsswitched-capacitor (SC) converterszero-voltage gap (ZVG)modularizationelectric vehicles (EVs) |
| spellingShingle | Yunlong Shang Qi Zhang Naxin Cui Chenghui Zhang A Cell-to-Cell Equalizer Based on Three-Resonant-State Switched-Capacitor Converters for Series-Connected Battery Strings Energies battery equalizers battery management systems switched-capacitor (SC) converters zero-voltage gap (ZVG) modularization electric vehicles (EVs) |
| title | A Cell-to-Cell Equalizer Based on Three-Resonant-State Switched-Capacitor Converters for Series-Connected Battery Strings |
| title_full | A Cell-to-Cell Equalizer Based on Three-Resonant-State Switched-Capacitor Converters for Series-Connected Battery Strings |
| title_fullStr | A Cell-to-Cell Equalizer Based on Three-Resonant-State Switched-Capacitor Converters for Series-Connected Battery Strings |
| title_full_unstemmed | A Cell-to-Cell Equalizer Based on Three-Resonant-State Switched-Capacitor Converters for Series-Connected Battery Strings |
| title_short | A Cell-to-Cell Equalizer Based on Three-Resonant-State Switched-Capacitor Converters for Series-Connected Battery Strings |
| title_sort | cell to cell equalizer based on three resonant state switched capacitor converters for series connected battery strings |
| topic | battery equalizers battery management systems switched-capacitor (SC) converters zero-voltage gap (ZVG) modularization electric vehicles (EVs) |
| url | http://www.mdpi.com/1996-1073/10/2/206 |
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