Prismatic Lithium Battery Annexe
Products Description
The Prismatic Lithium Battery Annexe refers to the aluminum alloy component located at the top of a prismatic lithium-ion battery. It integrates positive and negative terminals, an explosion-proof valve, a liquid-filling port, and an insulating sealing structure, serving as the sole interface between the battery's internal electrochemical system and the external electrical and mechanical environment. This assembly performs four core functions within the battery package-current conduction, gas pressure relief, electrolyte sealing, and insulation protection-thereby directly influencing the battery's safety, cycle life, and manufacturing yield.
Key Functions
High-Airtightness Electrolyte Barrier
aluminum battery cover ensures that the highly volatile and corrosive lithium hexafluorophosphate (LiPF₆) electrolyte does not leak-even in trace amounts-throughout the battery's entire lifecycle, while also protecting the internal electrochemical system from contamination by external impurities.
Rigid External Electrical Interconnection
Positive and negative terminals pass through the aluminum battery box cover, establishing a rigid, low-loss electrical connection that transfers energy generated by the internal cell core (jelly-roll or stacked) to external aluminum or copper busbars.
Overpressure and Overcurrent Safety Valve
In the event of internal short-circuiting and thermal runaway-triggered by external factors such as nail penetration, crushing, or overcharging-causing a rapid rise in internal pressure, the safety valve ruptures to release high-pressure gases, thereby preventing a catastrophic physical explosion of the battery casing.
Heavy-Duty, Vibration-Resistant Structural Surface
Serving as the primary load-bearing top surface during module assembly, Lithium-ion Battery Cover Plates effectively withstands the pre-tightening forces applied when securing module side plates and end plates, and absorbs dynamic impact and shear forces caused by vibration.
Technical Features
Optimized Sealing Groove Geometry
The sealing groove features a trapezoidal rather than rectangular cross-section; upon compression, the O-ring makes line contact rather than surface contact, resulting in more uniform sealing pressure distribution and increasing the IP68 validation pass rate to 99.2% for aluminum battery box cover.
Explosion-Proof Pressure Relief Structure
The LFP Safety Cover Set incorporates a pre-designed thin-walled pressure relief zone (0.8–1.2 mm thick) that ruptures to release pressure in a controlled direction when internal battery pressure exceeds 0.5 MPa, directing the rupture away from the BMS and high-voltage connectors.
Optional Insulation Coating
A ceramic coating (Al₂O₃, 50–100 μm thick) can be applied to the aluminum alloy surface of aluminum battery cover, increasing insulation resistance from ≥100 MΩ to ≥500 MΩ and meeting safety requirements for high-voltage battery packs (>60 V).
Application Areas
| New Energy Vehicle Power Batteries | Standardized packaging components for prismatic aluminum-cased cells, suitable for battery packs in passenger vehicles, commercial vehicles, and special-purpose vehicles for Lithium-ion Battery Cover Plates. |
| Energy Storage Systems | Cell packaging for grid-side, industrial and commercial, and residential energy storage systems for LFP Safety Cover Set. |
| Consumer Electronics | Applications requiring high battery energy density and safety, such as laptops and power tools for aluminum battery cover. |
| Electric Marine Vessels and Specialized Equipment | Sectors with specific requirements for battery structural integrity and environmental adaptability. |
contact us
If your project involving prismatic lithium battery modules or energy storage systems requires a high-performance Prismatic Lithium Battery Annexe, please provide the cell specifications and technical parameters. Our engineering team will respond promptly to deliver customized design solutions and sample validation, helping your project achieve superior safety and energy density.
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