Insulating Fluid

Why Immersion Lithium Batteries Use Biodegradable Insulating Fluid

The idea is not to place batteries in any random liquid. An immersion battery pack places cells, BMS, connectors and structural parts in a fluid environment designed for electrical insulation, material compatibility and thermal management.

Direct Answer

Immersion lithium batteries use a specific insulating fluid, not water or ordinary conductive liquid. The fluid should support electrical insulation, heat exchange, material compatibility, low corrosion, sealing compatibility and environmental handling. Biodegradable or environmental attributes should be supported by material documents or test records.

What the Fluid Does

Direct heat contactThe fluid contacts cell surfaces and supports heat exchange close to the source.

Electrical insulationThe medium must be electrically insulating to avoid the short-circuit risk associated with conductive liquids.

Temperature uniformityIt helps reduce local hot spots during charge and discharge.

System redundancyIt works together with BMS, structure, sealing, venting and factory testing to help reduce propagation risk.

What Buyers Should Verify

Check Item	Why It Matters	Suggested Documents
Electrical insulation	Confirms whether the fluid is suitable for an internal battery pack environment	Material notes, insulation data
Material compatibility	Affects housing, wires, seals, adhesives and connectors	Compatibility notes, project validation records
Thermal stability	Affects fast charging, high temperature and abnormal heating boundaries	Thermal data, test summary
Sealing compatibility	Affects transport, vibration, battery swapping and long-term reliability	Structure design, sealing test and factory inspection
Environmental attributes	Supports export documentation, disposal planning and compliant marketing claims	Supplier material documents or test records

Claim Boundaries

It is acceptable to state that the solution uses biodegradable insulating fluid, with attributes subject to material documents.
It is acceptable to state that the design helps reduce thermal runaway propagation risk.
Avoid absolute claims such as completely preventing thermal runaway or guaranteeing no fire under all conditions.
Custom projects should be reviewed by cell type, structure, BMS, capacity, operating conditions and certification scope.

Sources and Review

Shanghai Xinhui Green Energy product brochure materials
Immersion battery technical materials
GB 43854-2024 certification-related requirements
Final project specifications subject to mutual confirmation

Reviewed by: Product team and certification material team.
Last updated: 2026-05-20.

Need fluid and material compatibility notes?

Send your application, voltage, capacity, installation environment and target market. We can prepare a project-specific document checklist.

Submit Technical Requirements