Balancing Control Strategy for Li-Ion Batteries String Based on Dynamic Balanced Point

Zhang, Donghua; Zhu, Guorong; He, Shuping; Qiu, Shi; Ma, Yan; Wu, Qinmu; Chen, Wei

doi:10.3390/en8031830

Cited by 28 publications

(16 citation statements)

References 21 publications

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“…where P batt is the battery output power, η m is the efficiency of the driving motor system including motor and motor controller, which can be obtained by the look-up table method based on the efficiency map shown as Figure 1; U oc is the battery open-circuit voltage, I L is the battery operating current, R 0 is the battery internal resistance, and here U oc and R 0 can be measured with the experimental method [25]. SOC t is the SOC to be solved, SOC 0 is the initial value of the power battery SOC, Q b is the total capacity of the power battery, which decreases with the decrease of a battery state of health (SOH) [21], η batt is the power battery charge and discharge efficiency.…”

Section: Power Battery Modelmentioning

confidence: 99%

Research on the Energy-Saving Strategy of Path Planning for Electric Vehicles Considering Traffic Information

et al. 2019

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Battery-powered electric vehicles (EVs) have a limited on-board energy storage and present the problem of driving mileage anxiety. Moreover, battery energy storage density cannot be effectively improved in a short time, which is a technical bottleneck of EVs. By considering the impact of traffic information on energy consumption forecasting, an energy-saving path planning method for EVs that takes traffic information into account is proposed. The modeling process of the EV model and the construction process of the traffic simulation model are expounded. In addition, the long-term, short-term memory neural network (LSTM) model is selected to predict the energy consumption of EVs, and the sequence to sequence technology is used in the model to integrate the driving condition data of EVs with traffic information. In order to apply the predicted energy consumption to travel guidance, a road planning method with the optimal coupling of energy consumption and distance is proposed. The experimental results show that the energy-based economic path uses 9.9% lower energy consumption and 40.2% shorter travel time than the distance-based path, and a 1.5% lower energy consumption and 18.6% longer travel time than the time-based path.

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Section: Power Battery Modelmentioning

confidence: 99%

Research on the Energy-Saving Strategy of Path Planning for Electric Vehicles Considering Traffic Information

et al. 2019

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“…Unfortunately, this weakest cell will determine the capacity of the entire battery. The PEQ heating problem can be reduced by using active equalizers (AEQ) [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] that transfer the charge between the cells, but they are seldom used due to their higher cost. The cost also limits the size of the AEQ equalization currents, so they are not very effective in compensating for large imbalances in the cell capacity.…”

Section: Introductionmentioning

confidence: 99%

A Bilevel Equalizer to Boost the Capacity of Second Life Li Ion Batteries

2019

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There is a strong interest in second life applications for the growing number of used electric vehicle (EV) batteries, but capacity variations amongst these used cells present a problem. Even when these cells are matched for capacity, some imbalance is bound to remain, and a few lower capacity cells are also likely to develop after the pack begins its second life. Conventional cell voltage equalizers (EQU) do not address this problem, and they only provide a battery discharge capacity that is exactly equal to that of the weakest cell in the pack. This can easily result in a capacity loss of perhaps 20% to 25%, or more. This indicates the need for a new class of EQUs that can provide a discharge capacity that is close to the average of the cells, instead of the weakest cell. It is proposed to call these “capacity EQUs”, and the properties they must have are described. One such EQU is the bilevel equalizer (BEQ), described previously. This present paper provides an enhanced analysis of the BEQ and improved modelling methods. It also presents more details that are necessary to implement the microcontroller algorithm for the BEQ hardware.

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“…Overcharge and deep discharge both will cause the battery cell to be deteriorated forever or even worse [1,2]. The poor performance of single cell will limit the normal operation of the whole series string [3] The voltage balancing device, also known as voltage equalizer, is therefore indispensable equipment in battery management systems (BMS) [4].…”

Section: Introductionmentioning

confidence: 99%

An Automatic Switched-Capacitor Cell Balancing Circuit for Series-Connected Battery Strings

Cheng

2016

Energies

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Abstract:In this paper, a novel voltage equalizer is developed for series battery strings based on the two-phase switched capacitor technique. Different from the conventional voltage equalizers which are developed by switched-mode power converters, bulky magnetic components and complex monitoring and control system are avoided in the proposed system. Just a pair of complementary pulse signals with constant switching frequency and fixed duty ratio are required to control all of switches employed in the proposed voltage equalizer, and charge transfers from the higher voltage battery cells to lower voltage ones automatically. The circuit configuration and operation principle are provided in this paper. The model of the proposed voltage equalizer is also derived. Comparison with other works indicates that the proposed method is superior to the conventional switched-capacitor (SC) voltage equalizer for the high stack of series battery strings. Experimental results demonstrate that the proposed voltage equalization system is capable of excellent voltage balancing performance with a simple control method.

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Balancing Control Strategy for Li-Ion Batteries String Based on Dynamic Balanced Point

Cited by 28 publications

References 21 publications

Research on the Energy-Saving Strategy of Path Planning for Electric Vehicles Considering Traffic Information

Research on the Energy-Saving Strategy of Path Planning for Electric Vehicles Considering Traffic Information

A Bilevel Equalizer to Boost the Capacity of Second Life Li Ion Batteries

An Automatic Switched-Capacitor Cell Balancing Circuit for Series-Connected Battery Strings

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