BBU (Battery Backup Unit) is the lithium-ion safety net sitting inside AI server racks — absorbing GPU power spikes in milliseconds and bridging outages before UPS takes over. As NVIDIA GB200/GB300 racks push toward 120–140 kW per cabinet, BBU has moved from optional to mandatory.
Sources: Valuates Reports · Pmarket Research · 雪球
AI training workloads draw power in millisecond pulses. A single NVIDIA GB300 rack can peak at 120–140 kW, spiking so fast it can trip breakers or collapse bus voltage — interrupting a training run that costs millions. BBU discharges at 10C+ rates to flatten those peaks and takes over in ~2ms during a grid flicker, holding 60–120 seconds while GPUs save gradients.
That is why hyperscalers are shifting from centralized UPS to distributed rack-level backup — and why suppliers from Samsung SDI to Vertiv, Delta and a fast-growing Chinese pack ecosystem are all racing to fill capacity.
| Layer | What they make | Key suppliers |
|---|---|---|
| High-rate cells | 21700 high-discharge lithium cells (10C+) | Samsung SDI, Panasonic, Murata, LG, 蔚蓝锂芯, 亿纬锂能, 欣旺达, 豪鹏科技 |
| Module / PACK | BBU module integration with BMS, DC/DC, thermal | 台达, 光宝, 新普, 麦格米特, Vertiv, Eaton, Schneider, 华为 |
| BMS & monitoring | Battery management, cell monitoring, safety | 华塑科技, TI, NXP, Renesas |
| System architecture | 48V/50V rack power, HVDC integration | NVIDIA reference designs, OCP, 英业达, 纬创, 广达 |
Want to reach the engineers and procurement teams buying this equipment? Advertise on BBU Power — banners from $103/month.