‑ The flow‑channel area of this electrolyzer is 5 cm², and custom sizes are available upon customer requirements. ‑ The electrolyzer consists of end plates, current collectors, bipolar plates and electrode frames. ‑ To guarantee electrical conductivity, its bipolar plates are made of high‑purity graphite, fitted with PEEK fixing rods. ‑ Featuring excellent stability, the electrolyzer can sustain thousands of cycles. It withstands high‑temperature conditions and effectively improves evaluation efficiency. ‑ During discharge, vanadium ions can be stably and continuously released to complete energy‑storage experiments. ‑ It is suitable for preliminary research on large‑scale energy‑storage applications, such as energy storage matched with wind power, photovoltaic and other renewable energy sources, grid peak‑shaving and valley‑filling, emergency backup power supplies, etc. Benefiting from recyclable electrolyte, high safety and long service life, it represents an important technical direction for long‑duration energy storage.