Provide reliable backup power for the deep sea

High-Reliability Non-Rechargeable Backup Battery Solution – Ensuring Uninterrupted Power for Unmanned Marine Systems
Client Industry: Marine Environmental Monitoring / Offshore Oil & Gas Platforms
Application: Deep-Sea Subsurface Buoys, Meteorological Buoys, Safety Systems for Offshore Platforms

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1. Project Background

A leading domestic marine equipment manufacturer sought to develop non-rechargeable backup battery packs for next-generation unmanned monitoring systems, with critical requirements:

• Ultra-Low Self-Discharge: Capacity decay rate <3% per year over a 5–10-year standby lifespan.

• Extreme Environment Resilience: Operational range of -40°C to +60°C, IP68 protection, and salt spray corrosion resistance (ASTM B117 compliant).

• Instant High-Rate Response: Achieve ≥5C peak current output within 0.5 seconds upon primary power failure.

After evaluating multiple suppliers, the client selected our team to develop two customized battery solutions (Standard BMS-OB1 / High-Power BMS-OB2). Both variants successfully passed CNOOC’s stringent HSE Safety Certification.

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2. Core Challenges

1. Zero-Maintenance Reliability: Battery lifespan must match the equipment’s 10+ year service life without intervention.

2. Deep-Sea Pressure Cycling: Deployment depths of 500–2,000 meters required encapsulation to withstand 20MPa cyclic pressure shocks.

3. Explosion-Proof Redundancy: Eliminate electrolyte leakage risks to comply with offshore platform safety standards (IECEx/ATEX certified).

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3. Solution & Technological Innovations

3.1 Battery Chemistry Optimization

• Lithium Thionyl Chloride (Li-SOCl₂) with Spiral Wound Structure:

  • BMS-OB1 (Standard): 750Wh/kg energy density, <1% annual self-discharge, and -40°C cold-start capability.

  • BMS-OB2 (High-Power): Carbon-coated cathode enhanced pulse discharge to 8C for instantaneous high-current demands.

3.2 Pressure-Adaptive Encapsulation

• Gradient Pressure Compensation Technology:

  • Titanium alloy housing with embedded silicone gel layers dynamically balanced internal/external pressure differentials, validated through 2,000 pressure cycles (simulating 10-year service).

  • Multi-layer hermetic sealing (laser welding + ceramifiable fireproof adhesive) ensured dual leakage barriers.

3.3 Intelligent Sleep-Wake System

• Nano-Power Management IC: Standby current <1μA, with only core BMS circuits active during hibernation.

• Magnetic Trigger Activation: Enabled subsea robots to remotely awaken the backup system via proximity magnetic signals, eliminating corrosion-prone physical switches.

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4. Results & Client Value

• 10-Year Maintenance-Free Operation: Accelerated aging tests confirmed ≥97% capacity retention after 5 years, far exceeding industry benchmarks (90%).

• Zero Safety Incidents: 320 deployed units demonstrated flawless performance in South China Sea typhoons and Bohai Sea extreme cold.

• Client Benefits:

  • Reduced total lifecycle maintenance costs by 40%.

  • Secured a ¥260 million contract for China’s “Smart Ocean” monitoring network project.

Client Testimonial:

*“From initial requirements to mass production in just 14 weeks, both battery variants perfectly addressed our needs across shallow to abyssal environments. Their rapid customization capability is why we trust them as a long-term partner.”*
— Client Technical Director

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5. Key Differentiators (For Marketing Highlights)

✅ 10-year standby with <3% capacity loss ✅ 20MPa deep-sea pressure resilience ✅ 0.5s seamless power switching
✅ IECEx/ATEX dual certification ✅ 100% leak-proof guarantee

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Visual Asset Recommendations

1. Technical Illustrations:

   • Cross-sectional view of battery pack (highlighting titanium housing, gel compensation layer, and multi-layer seals).

   • BMS sleep-wake workflow diagram (magnetic trigger mechanism).

2. Testing Scenario Photos:

   • Battery packs in thermal chambers (-40°C/+85°C extreme testing).

   • Pressure cycling tests in hyperbaric chambers (with real-time sensor data overlays).

3. Application Renderings:

   • Battery integration schematic in deep-sea buoys (annotating critical power nodes).

   • HMI interface screenshot showing 99% battery health on offshore platforms.

4. Certifications & Data Charts:

   • Scanned IECEx/ATEX certificates.

   • 10-year capacity decay comparison chart (competitors vs. BMS-OB series).