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Dongguan, China

Zhong Q.,University of Electronic Science and Technology of China | Zhong Q.,China Zhenhua Electronics Group Co. | Bai J.,University of Electronic Science and Technology of China | Wen B.,University of Electronic Science and Technology of China | And 2 more authors.
ISA Transactions | Year: 2014

This paper investigates the problem of finite-time boundedness filtering for discrete-time Markovian jump system subject partly unknown transition probabilities. By using the multiple Lyapunov function approach, a novel sufficient condition for finite-time bounded of H∞ filtering is derived and the system trajectory stays within a prescribed bound during a specified time interval. Finally, an example is provided to illustrate the usefulness and effectiveness of the proposed method. © 2014 ISA.

Zhong Q.-S.,University of Electronic Science and Technology of China | Zhong Q.-S.,Sinowatt Dongguan Ltd | Zhong Q.-S.,China Zhenhua Electronic Group Co. | Li S.-J.,Sinowatt Dongguan Ltd | And 4 more authors.
Dianzi Keji Daxue Xuebao/Journal of the University of Electronic Science and Technology of China | Year: 2014

Electric vehicles (EVs) are developed rapidly due to the energy problem and the environment problem, and lithium-ion batteries play an important role in energy storage system of EVs. The characteristics of power lithium-ion batteries are closely connected to ambient temperature. The discharge capacity characteristic and the state of charge-open circuit voltage (SOC-OCV) curve are important parameters to represent the performance of power batteries and to design battery management systems (BMS). The experiments of 18650 cells and packs are carried out for the laws between SOC and OCV, also for the discharge capacity with different rates and ambient temperatures.

Zheng L.-Q.,Sinowatt Dongguan Ltd | Li S.-J.,Sinowatt Dongguan Ltd | Lin H.-J.,Sinowatt Dongguan Ltd | Miao Y.-Y.,Sinowatt Dongguan Ltd | And 2 more authors.
Russian Journal of Electrochemistry | Year: 2014

Effects of water on the voltage, internal resistance, initial capacity and cycling behavior of 18650-type lithium-ion batteries are studied. The voltage curves of the first charging can be used to judge whether cells are contaminated by water, because the voltage growth rates of cells are obviously different (>100 mV) between water-free batteries and containing water batteries at the first charging period of 10–50 min. The self-discharging performances of water contamination cells are also larger, because water-related side effects happen continuously during aging at high voltage of 4.2 V. Besides, HF corrosion on the cathode materials and Co ion dissolved out from lithium nickel cobalt manganese oxides lead to rapid capacity fading from >90% (100 cycles) to <80% (300 cycles, 0.5 C charging/0.5 C discharging). © 2014, Pleiades Publishing, Ltd.

Zheng L.-Q.,Sinowatt Dongguan Ltd | Li S.-J.,Sinowatt Dongguan Ltd | Zhang D.-F.,Sinowatt Dongguan Ltd | Lin H.-J.,Sinowatt Dongguan Ltd | And 3 more authors.
Russian Journal of Physical Chemistry A | Year: 2015

The capacity fading of LiCoO2-based lithium ion batteries during storage was studied. The discharging capacity fading is attributed to the decreasing in the charging capacity at the constant current stage. After 300 cycles, the ratio of the charging capacity of batteries at the constant current stage to the total charging capacity decreases from 87.2 to 71.2%. The bounce-back voltage is closely related to the internal resistance when the battery is discharged to the cut-off voltage of 3.0 V. Batteries were disassembled in the fully discharged state, and then a assembled again in order to deeply understand the causes of the capacity fading of the cathode and anode. The results shows that the SEI film thickness increasing, breaking or repairing process at the anode could be responsible for the high bounce-back voltage, the increase of the internal resistance and the capacity fading during storage. © 2015 Pleiades Publishing, Ltd.

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