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

Xu, Jun; Li, Siqi; Mi, Chris; Chen, Zheng; Cao, Binggang

doi:10.3390/en6062726

Cited by 49 publications

(29 citation statements)

References 25 publications

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“…The superiority over passive balancing in terms of energy efficiency and speed has been proven in theory ( [2], [3], [4]) and by measurement (see references in Table 1 and [5], [6], [7]). Despite the advantages, battery systems with active balancing are still rare in industrial applications.…”

Section: Introductionmentioning

confidence: 99%

A Novel Non-Isolated Active Charge Balancing Architecture for Lithium-Ion Batteries

Räber

Hink

Heinzelmann

et al. 2018

2018 IEEE 27th International Symposium on Industrial Electronics (ISIE)

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-Active charge balancing is an approved technique to implement high performance lithium-ion battery systems. Enhanced balancing speeds and reduced balancing losses are feasible compared to passive balancing. The new architecture proposed in this paper overcomes several drawbacks of other active balancing methods. It consists of only 2 non-isolated DC/DC converters. In combination with a MOSFET switch matrix it is able to balance arbitrary cells of a battery system at high currents. Adjacent cells can be balanced simultaneously. For the given setting, numerical simulations show an overall balancing efficiency of approx. 92.5%, compared to 89.4% for a stack-tocell-to-stack method (St2C2St, bidirectional fly-back) at similar balancing times. The usable capacity increases from 97.1% in a passively balanced system to 99.5% for the new method.

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Section: Introductionmentioning

confidence: 99%

A Novel Non-Isolated Active Charge Balancing Architecture for Lithium-Ion Batteries

Räber

Hink

Heinzelmann

et al. 2018

2018 IEEE 27th International Symposium on Industrial Electronics (ISIE)

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“…Nonetheless, the lithium battery has been considered one of the major viable energy storage media in electric cars [4][5][6][7]. To meet the voltage and power requirements of cars, if we use small-capacity and low-power lithium cells, as in Tesla's Model S, then the cells should be connected in parallel or/and series fashion [8][9][10][11]. A parallel-connected cell pack (PCCP) can be regarded as a larger single cell by omitting the differences among cells.…”

Section: Introductionmentioning

confidence: 99%

Energy Management of Parallel-Connected Cells in Electric Vehicles Based on Fuzzy Logic Control

et al. 2017

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Abstract:Inconsistencies that are associated with parallel-connected cells used in electric vehicles induce varied states of charge (SOCs) in each cell. Thus, loop current in the battery pack is inevitable, and this reduces overall capacity, energy utilization rate, and pack lifetime. However, no method is available to address loop current. To reduce loop current and the resulting battery inconsistency, a parallel-connected cell pack (PCCP) model that considers thermal effects is established, and a novel Simscape model that is based on PCCP is successfully constructed. Furthermore, the strategy of parallel-connected cell energy management (PCCEM) is proposed to utilize fuzzy logic control (FLC) strategy, which automatically adjusts the number of cells in a circuit in accordance with the load demand, and turns on the first N switches in the corresponding SOC order. The New European Driving Cycle (NEDC) driving cycle simulation shows that the PCCEM strategy considerably reduces loop current and improves the consistency of battery performance and the utilization rate of battery power.

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“…Differences in voltage can occur due to cells being at unequal SOCs and impedance variation between cells. Variations can occur for a variety of reasons, including differences in capacity, self-discharge rate and temperature [43,44].…”

Section: Charging Cells In Seriesmentioning

confidence: 99%

Analysis of a Battery Management System (BMS) Control Strategy for Vibration Aged Nickel Manganese Cobalt Oxide (NMC) Lithium-Ion 18650 Battery Cells

et al. 2016

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Electric vehicle (EV) manufacturers are using cylindrical format cells as part of the vehicle's rechargeable energy storage system (RESS). In a recent study focused at determining the ageing behavior of 2.2 Ah Nickel Manganese Cobalt Oxide (NMC) Lithium-Ion 18650 battery cells, significant increases in the ohmic resistance (R O ) were observed post vibration testing. Typically a reduction in capacity was also noted. The vibration was representative of an automotive service life of 100,000 miles of European and North American customer operation. This paper presents a study which defines the effect that the change in electrical properties of vibration aged 18650 NMC cells can have on the control strategy employed by the battery management system (BMS) of a hybrid electric vehicle (HEV). It also proposes various cell balancing strategies to manage these changes in electrical properties. Subsequently this study recommends that EV manufacturers conduct vibration testing as part of their cell selection and development activities so that electrical ageing characteristics associated with road induced vibration phenomena are incorporated to ensure effective BMS and RESS performance throughout the life of the vehicle.

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

Cited by 49 publications

References 25 publications

A Novel Non-Isolated Active Charge Balancing Architecture for Lithium-Ion Batteries

A Novel Non-Isolated Active Charge Balancing Architecture for Lithium-Ion Batteries

Energy Management of Parallel-Connected Cells in Electric Vehicles Based on Fuzzy Logic Control

Analysis of a Battery Management System (BMS) Control Strategy for Vibration Aged Nickel Manganese Cobalt Oxide (NMC) Lithium-Ion 18650 Battery Cells

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