Desiccant for Electrochemical Energy Storage

1. Warehouse Moisture Protection:

• Scenario: Finished goods warehouses, transfer warehouses (especially those without constant temperature & humidity control).
• Solution: Deploy high moisture-absorption rate hanging desiccant strips within the warehouse, combined with temperature and humidity monitoring. This maintains a stable long-term environmental humidity between 15°C – 30°C and 40% RH – 75% RH. Crucially, condensation must be strictly prevented.
• Recommended Product: Hanging Calcium Chloride or Magnesium Chloride desiccant strips (single-layer packaging).

2. Storage & Transportation Phase:

• Inner Packaging Moisture Protection: Apply sufficient adhesive desiccant strips between the battery cell stack and the outer carton. This specialized strip is designed for cell stack packaging. It effectively absorbs any infiltrating trace moisture and residual moisture from the packaging materials themselves, providing enhanced protection against moisture damage to the cells.

Recommended Product: Adhesive, spaced and connected multi-packet desiccants. (For smaller cartons or small-format cell packaging, single packets of physical adsorbents like silica gel or montmorillonite clay desiccants are recommended inside the package.)

maritime shipping environment, evenly hang “Container-Specific Desiccant Strips” inside the container. Standard dosage: 6-8 strips for a 20-foot container, 10-12 strips for a 40-foot container.

Recommended Products: Vertical-Hanging Container Desiccant Strips (double-layer packaging, hung on the inner sides of the container), Horizontal-Hanging Container Desiccant Strips (double-layer packaging, hung from the top inside the container).

1. Warehouse Moisture Protection:

• Scenario: Battery pack finished goods warehouse.
• Solution: In addition to controlling the overall warehouse humidity (refer to Battery Cell Warehouse Protection), for battery packs intended for long-term storage, it is recommended to cover them with a “moisture-proof cover“ or place them inside a “large moisture barrier bag“ to create a “secondary sealed” environment. Place “physical adsorbent desiccants“ (which can contact the battery pack directly with no corrosion risk) and a “humidity indicator card“ inside this barrier.
• Recommended Products: Silica Gel Desiccant, Montmorillonite Clay Desiccant, Humidity Indicator Card.

2. Storage and Transportation Phase:

• In-Package Moisture Protection: Inside the battery pack’s shipping crate or sturdy outer packaging, use “adhesive magnesium chloride desiccants“ on the inner walls. Their high moisture absorption capacity and rapid absorption rate effectively buffer against humidity fluctuations caused by significant temperature differentials.

Recommended Product: Adhesive Magnesium Chloride Desiccants

• Container Shipping: For the high-humidity, high-salt-fog maritime shipping environment, evenly hang “Container Dry Poles“ inside the container and lay “Container Desiccant Blankets“ flat on top of the goods’ wooden crates. Standard dosage: 6-8 rods for a 20-foot container, 10-12 rods for a 40-foot container. The number of blankets can be added as needed based on the shipping route and voyage duration.

Recommended Products: Container Dry Poles (triple-layer packaging with cardboard reinforcement to prevent crushing by wooden crates, hung on the inner sides of the container), Container Desiccant Blankets (double-layer packaging, laid flat on top of the wooden crates).

1. Transport Without Disassembly (Container-Level Shipping):

This method involves factory-level pre-integration, where all core components—such as battery racks, PCS, fire suppression, thermal management, and power distribution systems—are installed, wired, and tested within the factory to form a complete, containerized energy storage unit (prefabricated cabin). This integrated unit is then transported as a whole to the project site.
Core Challenge: As a highly integrated, live electrical system with complex internal spaces and numerous electrical devices, it faces significant risks from the “Breathing Effect” and condensation. Even the accumulation of trace amounts of moisture can pose a serious threat to critical areas like the high-voltage compartment and control cabinets.

Specific Measures:

• Although the energy storage container doors are sealed, to address extreme weather or prolonged transportation, additional waterproof/dustproof covers or sealing tape should typically be applied to areas such as “ventilation openings, external air conditioner grilles, and cable interface panels“ for temporary sealing to prevent moisture ingress. Inside the container, use “hanging connected packets of silica gel or montmorillonite clay desiccant“ (physical adsorbent type, non-corrosive, safe for direct contact).
• Even for container-level shipping, it is still necessary to hang a sufficient quantity of “container-specific desiccant“ inside the shipping container (referring to the sea freight container) to counteract the external high-humidity environment and provide an additional dry buffer zone for the entire prefabricated cabin.
• Upon arrival at the project site, if immediate installation and commissioning are not possible, it is recommended to “maintain the container’s seals and the internal dry environment“ until grid connection and operation.

Recommended Products: Hanging connected packets of silica gel or montmorillonite clay desiccant (for hanging inside the energy storage container), Container Dry Poles (triple-layer packaging with cardboard reinforcement, hung on the inner sides of the shipping container), Container Desiccant Blankets (double-layer packaging, laid flat on top of the goods’ packaging).

2. Transport With Disassembly:

• This shipping method involves disassembling the system down to the “battery pack level“. Transporting these smaller units allows for “tight stacking“, resulting in “lower transportation costs“. Please refer to the previously outlined moisture protection solutions for battery packs during storage and transportation.

Operational Standards & Safety Management

• Seal First: The effectiveness of all desiccant solutions is predicated on the protected space being as sealed as possible. Performance is significantly reduced in unsealed environments.
• Prevent Condensation: Monitor temperature differentials along the planned shipping route. For cargo expected to undergo drastic temperature swings, increase desiccant dosage and consider using a sealed moisture-proof cover.
• Safe Placement: Desiccant packaging must remain intact to prevent leakage. Avoid any direct contact between desiccant packets and battery cell terminals or other live electrical connectors.
• Inspection Upon Arrival: Upon receipt, inspect the external packaging for integrity and signs of water damage. Check the status of the included Humidity Indicator Card (recommended) as a direct visual indicator of potential moisture exposure.
• System Inspection: For large energy storage containers, conduct a comprehensive pre-commissioning inspection. This must include insulation resistance testing, a visual check of all equipment, and an assessment of internal humidity levels.
• Environmentally Friendly Disposal: Used desiccants must be disposed of in compliance with all applicable local environmental regulations.