High-Safety Li-MnO₂ Battery Pack Customization – Enabling ADCP to Win Deep-Sea Monitoring Tender

High-Safety Li-MnO₂ Battery Pack Customization – Enabling ADCP to Win Deep-Sea Monitoring Tender

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1. Project Background

A marine equipment supplier participated in a government tender for deep-sea monitoring networks, requiring a safe, maintenance-free power system (≥8 months) for their ADCP devices. Initially considering Li-SOCl₂ batteries, pre-research revealed critical issues:

• Passivation Risks: Prolonged low-temperature exposure could cause electrode passivation, leading to voltage lag;

• Safety Concerns: Steel-shell batteries risked leakage under extreme pressure.

Through competitive tender evaluation, the client commissioned us to design a Li-MnO₂ battery solution, which ultimately secured their winning bid.

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2. Key Challenges

1. Safety vs. Performance: Eliminate passivation risks while achieving IP68 & 15MPa pressure resistance;

2. Tender Requirements: Energy density ≥500Wh/kg, ≥85% capacity retention at -30℃;

3. Rapid Certification: Deliver tested prototypes within 8 weeks, passing third-party abyssal simulation.

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3. Customized Solutions

Technical Decision: Why Li-MnO₂?

• Enhanced Safety: Pouch cell design eliminates rigid metal shells;

• Zero Passivation: Optimized electrolyte ensures stable voltage output in low temperatures;

• Design Flexibility: Scalable series/parallel configurations for compact ADCP housing.

Implementation: Two Tailored Battery Packs

1. Standard Version (BMS-ADCP-LM1)

   • Stacked Pouch Cells: 520Wh/kg energy density, 88% efficiency at -30℃;

   • Pressure-Adaptive Structure: Silicone damping + CFRP casing, validated at 1500m depth;

   • Compliance Ready**: Pre-integrated UN38.3/CE modules accelerated tender documentation.

2. Extended Version (BMS-ADCP-LM2)

   • Hybrid Topology**: 15% capacity boost in same volume, 10-month lifespan;

   • Self-Heating System**: Raises cell temperature from -30℃ to -10℃ in 5 minutes;

   • Telemetry Interface**: Compatible with client’s acoustic communication protocols.

Core IP

• Patented Sealing: Nano-injection molding + laser welding passed 2000hrs salt spray tests;

• Adaptive BMS: Dynamic voltage cutoff extends cycle life to 2000 cycles (80% capacity retention).

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4. Results & Client Benefits

• Tender Success: Solution secured client’s 500-unit ADCP order (￥230M contract) against 3 global rivals;

• Exceeded Specs: 11.2-month field runtime (vs. 8-month requirement), 91% capacity at -30℃;

• Client Feedback:
  “The dual-version design not only met tender criteria but created a technological moat for future bids!”
  ——Client CTO

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5. Industry Impact

This solution has become a benchmark for deep-sea power systems, extending to AUVs and seabed seismometers, and was listed in 《National Marine Equipment Recommended Suppliers》.

Key Highlights
✅ Dual versions for tender precision ✅ Patented pressure resilience ✅ Passivation-free guarantee ✅ 8-week rapid delivery