Deep discharge energy storage battery is a customized energy storage battery optimized for full-depth cycle discharge working mode, specially developed for off-grid energy storage, seasonal energy regulation, household full-scenario power consumption and remote mining power supply scenarios. Ordinary general energy storage batteries are limited by pole plate corrosion and electrolyte degradation, which can only support 50% to 60% depth of discharge to prolong service life; once over-discharged, irreversible capacity attenuation and internal short circuit will occur. By contrast, deep discharge energy storage battery adopts thickened alloy composite pole plate, anti-depletion colloidal electrolyte and reinforced isolation membrane structure, which resists active material shedding and sulfation reaction under long-term deep discharge state.

The standard design depth of discharge of this battery reaches 90% to 95%, which maximizes the available energy capacity of single battery pack and reduces the number of battery packs configured in energy storage stations, thus cutting overall project equipment footprint and procurement cost. It adapts extreme working conditions such as long-term low-charge standby, full discharge overnight and repeated deep cycle charging. Under standard 90% depth of discharge cycle mode, its cycle life can reach more than 4000 times, far exceeding 1500 times cycle life of ordinary energy storage batteries under the same discharge depth. It also has excellent anti-over-discharge protection performance, which will not cause permanent damage to cell performance even under occasional 100% full discharge.

This battery is the preferred energy storage equipment for isolated power systems including island microgrids, mountain photovoltaic power stations, remote pastoral wind-solar storage integrated systems and emergency disaster-reserved energy storage stations. It makes full use of intermittent renewable energy, stores surplus new energy completely, and releases electric energy fully during power consumption peak without residual capacity waste. Matched with low-voltage energy storage inverter, it maintains stable voltage output in whole deep discharge stage, avoiding equipment shutdown caused by voltage collapse. For end users relying on renewable energy for self-use power supply, it improves renewable energy utilization rate by nearly 30% and realizes efficient full-cycle energy application.