The Kijima Airi Megapack (hereafter KA‑Megapack) is a next‑generation, modular lithium‑ion battery system designed for large‑scale energy‑storage projects. Launched in Q2 2024 by Kijima Energy Solutions (KES), a spin‑off from Japan’s historic Kijima Group, the KA‑Megapack blends high‑energy density chemistry, advanced power‑electronics, and a fully containerised form factor to deliver up to 500 MWh of stored energy per 40‑ft ISO container.
Within two years of its debut, the KA‑Megapack has secured over 12 GW of contracted capacity across Asia‑Pacific, Europe, and North America, positioning it as the third‑largest commercial battery‑pack platform behind Tesla’s Megapack and LG ESS’s Neon series.
Key differentiators include:
| Feature | KA‑Megapack | Tesla Megapack | LG ESS Neon | |---|---|---|---| | Chemistry | NMC‑811 (LiNi₀.₈Mn₀.₁Co₀.₁O₂) with Si‑graphite anode | NCA (LiNiCoAlO₂) | LFP (LiFePO₄) | | Energy per container | 500 MWh | 300 MWh | 200 MWh | | Round‑trip efficiency | 96 % (±0.3 %) | 93 % | 95 % | | Design life | 20 years / 30 k cycles | 15 years / 25 k cycles | 20 years / 35 k cycles | | Thermal‑management | Dual‑phase liquid‑coolant + phase‑change material (PCM) | Air‑cooling + liquid coolant | Air‑cooling | | Grid‑interface | 10 MW/50 MWh AC‑coupled + 5 MW/10 MWh DC‑coupled options | 3‑10 MW AC‑coupled | 2‑8 MW AC‑coupled | kijima airi megapack
The following sections unpack the technology, market dynamics, real‑world deployments, and the strategic outlook for the KA‑Megapack.
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A dual‑phase liquid‑coolant loop circulates a glycol‑water mixture through micro‑channels etched into each module’s aluminium housing. During peak discharge/charge, the system switches to a phase‑change material (PCM) buffer (paraffin‑based, melting point 45 °C) that absorbs excess heat, extending the cooling‑system’s capacity by up to 30 %.
Key metrics:
| Metric | Value | |---|---| | Operating temperature range | –20 °C to +50 °C (ambient) | | Maximum temperature rise (10 MW load) | 7 °C (container interior) | | Cooling‑system redundancy | Dual independent pumps, auto‑switchover |