The rapid growth of new energy vehicles has led to a surge in retired power batteries, posing environmental and resource challenges. This paper proposes a practical solution for echelon utilization of retired batteries in photovoltaic LED streetlights, using a parallel-connected battery architecture to enhance safety, extend lifespan, and reduce costs. The parallel topology leverages self-balancing properties, eliminating complex balancing circuits. A two-stage DC/DC conversion system addresses voltage mismatch between 3–4 V battery packs and 30 V LED loads. Experimental results show parallel-connected retired batteries retain 85.1% capacity after 500 cycles and 88.7% after 1-year field operation, outperforming series-parallel configurations. Safety tests confirm mitigated thermal runaway risks, and hardware costs are reduced by approximately 40%. This solution promotes circular economy practices for sustainable energy utilization.
Wan et al. (Fri,) studied this question.
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