standard seals Gasket static seal
Seal Overview: battery pack box seal mainly used gasket static seal, sealant static seal, forming filler (static and dynamic) sealed three categories. 3.1. Gasket static seal. Gasket seal is mainly rubber flat pad structure, the specific rubber flat pad specifications according to the box body shape. 3.1.1. Gasket sealing structure and principle The use of flat pad type does not have lipophilic, non-hydrophilic, under pressure to reduce the deformation of small foam material, silicone materials and rubber materials arranged in the upper and lower battery box with the surface, Up and down box compression seal. 3.1.2. Gasket sealing mechanism and selection of gasket is pressed by external force to produce elastic or plastic deformation, so as to fill the metal surface of the small rugged to achieve the seal. If the pressure is too small, the gasket can not stop the leak, but too much compression force will often make the gasket too large compression deformation or even damage.Therefore, in order to properly use the gasket, must be used to ensure that the seal Of the minimum compression force, the general deformation of the gasket to be controlled at less than 20%, in order to maintain the elasticity of the sealing material to achieve the sealing effect. In the design of the battery pack box to consider the minimum compression force (there is no sealant static seal. Sealant is mainly used for more mature battery system, so as to avoid disassembly of the battery pack, but the sealant because it is liquid To the battery pack box seal flange can be well filled with the gap between the upper and lower shell, to be solidified after sealing effect can be achieved IP67. The current use of liquid sealant HT901.
3.2.1. Sealant seal structure and mechanism 1) Estimation of the joint surface gap. The joint surface is measured with a gage before measuring the gap distance. When the gap is less than 0.1mm, the liquid sealant can be used alone; if the gap is 0.1 ~ 0.3mm between the liquid sealant must be used in conjunction with the solid gasket to achieve a good sealing effect; when the gap exceeds 0.3mm, if the experimental conditions are not harsh, the use of temperature and working pressure are not high, the use of liquid sealant and solid Gasket can also achieve a satisfactory sealing effect, otherwise the two will still be used after the leakage or penetration. 2) combined with large parts of the surface gap should be used to dry can be stripped, dry adhesive or semi-dry viscoelastic sealant solid gasket and use.
Battery pack liquid pipe fittings and other threaded seals, giving priority to the choice of polytetrafluoroethylene raw materials and anaerobic liquid sealant. In the case of small thread gap, the use of working pressure and temperature requirements are not high, but also can choose non-adhesive and semi-dry viscoelastic liquid seal, but can not use dry adhesive and dry removable rubber sealant. Because the dry liquid sealant contains a large amount of solvent, the solvent formed after the evaporation of the film on the thread pipe, easy to plug the pipe surface affect the work.
Coating: coating thickness depending on the processing accuracy of the seal, flatness, gap size and other specific circumstances, generally in the battery pack under the box with the flange surface coated with 0.12 ~ 0.2mm thickness can be. 3) Drying: solvent-based liquid sealant to be dry, drying time when the type of solvent used and coating thickness, generally 3 ~ 7mm. 4) fastening, fastening method and the use of the same gasket, can not be wrong to seal the surface.