Integration and application of retried LIBs in photovoltaic and energy storage micro grid

doi:10.19799/j.cnki.2095-4239.2020.0251

Abstract

Abstract:

To fulfill integration and application of retired Li-ion batteries in a PV and energy storage micro grid system, from the perspective of whole package using, checking appearance, nameplate, open circuit voltage (OCV), BMS communication of the 80 V-60 A·h batteries for initial filtration, then finishing second filtration through charging and discharging batteries, sorting batteries in accordance with valid capacity, grouping batteries by multichannel power conversion system (PCS), then applying in a PV and energy storage micro grid system. The results show the following: There are eight batteries that have a problem with appearance, OCV, or communication of the BMS, and 22 batteries also cannot be reused due to the capacity and the CD-OCV curve being unqualified. In the 50 remaining batteries, the maximum capacity is 49.46 A·h, and the minimum capacity is 45.58 A·h; so, the difference in value is 3.88 A·h, which is only 6.5% of the rated capacity, meaning these batteries present good uniformity. By charging and discharging under different rates, such as 0.1, 0.2, 0.3 and 0.5 C, the dispersion of the CD-OCV curves is small after grouping; when charging at a rate of 0.05 C and discharging at a rate of 0.1 C for peak cutting and valley filling, the charging energy is 111 kW·h and the discharging energy is 103 kW·h; so, the efficiency is 92.79%. This shows that the characteristics of the batteries are normal after filtrating and grouping, and the batteries have cascade utilization value.

Key words: retired Li-ion battery, whole package use, photovoltaic and energy storage micro gird

CLC Number:

TM 911.3

Yufeng XU, Jiabin YAN, Jianming HE, Zhengwei JU, Ge CHENG, Da ZHENG, Yinlong ZOU, Lei YE, Jianxin WANG. Integration and application of retried LIBs in photovoltaic and energy storage micro grid[J]. Energy Storage Science and Technology, 2021, 10(1): 349-354.

Figures/Tables 9

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序号	项目	参数	序号	项目	参数
1	额定电压/V	80	5	最大放电电流/A	180
2	额定容量/A·h	60	6	充电最高电压/V	87.6
3	重量/kg	61	7	放电截止电压/V	60
4	最大充电电流/A	60	8	交流内阻/mΩ	<40

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