1. Introduction

Underwater Conductivity, Temperature, and Depth (CTD) instruments are essential tools in oceanographic research and marine monitoring. These systems operate under extreme pressure, humidity, and temperature variations, making power reliability crucial for stable data collection and transmission.

PKNERGY provides advanced semi-solid lithium battery solutions tailored for underwater CTD applications—offering high safety, energy density, and extended lifespan under harsh marine conditions.

2. Application Background

CTD sensors are commonly deployed in buoys, AUVs (Autonomous Underwater Vehicles), and ROVs for ocean parameter measurement. Their power systems must handle high pressure, corrosion, and long-term submersion.

• Resist high pressure and corrosion for deep-sea deployment
• Provide stable discharge in low temperatures (–20°C)
• Deliver long autonomy — weeks or months of operation
• Fit compact instrument housings with balanced weight

Semi-solid lithium batteries address these challenges with superior sealing, pressure resistance, and energy efficiency, ensuring dependable operation for marine IoT instruments.

3. PKNERGY-Based Battery Solution

PKNERGY’s semi-solid lithium batteries combine the advantages of solid-state and liquid-electrolyte Li-ion systems for marine use:

• Chemistry: Semi-solid Li-ion with enhanced polymer electrolyte
• Voltage Range: 3.6V nominal per cell, configurable to 7.2V–14.4V packs
• Capacity: 5Ah–20Ah (customized per CTD requirement)
• Operating Temperature: –20°C to +60°C
• Cycle Life: >2000 cycles at 80% DOD
• Protection: PCM/BMS with waterproof encapsulation
• Enclosure: Marine-grade aluminum housing + epoxy potting (IP68)
• Certifications: UN38.3, IEC62133, CE, RoHS, MSDS

Optional modules include waterproof connectors, pressure compensation systems, and smart telemetry integration for marine IoT connectivity.

4. Value for Buyers, PMs, and Engineers

For Buyers

• Cost-effective OEM production with flexible MOQ
• Stable global logistics and lead-time management

For Project Managers

• OEM/ODM mechanical and electronic integration
• 3D design support and documentation service

For Engineers

• Fast prototyping (2–4 weeks)
• Pressure and temperature testing simulation
• Custom PCB and waterproof connector design

5. Case Study: 12.6V 9Ah Semi-Solid Battery for Marine CTD Sensor

Client: European ocean monitoring company

Requirement: Compact power system for Arctic CTD probes

Solution: 12.6V 9Ah semi-solid lithium battery with sealed aluminum enclosure

Result: Reliable operation for 180+ hours at 1500m depth, <5% performance degradation after 1 year field use.

6. Why PKNERGY

• 26 years of experience in lithium battery manufacturing
• Expertise in marine, IoT, and robotics energy systems
• Annual capacity: 20M+ cells, 500K+ battery packs
• In-house UN38.3, IEC62133, and IP68 testing
• Fast prototyping and small-batch production

7. FAQ