In lithium battery modules, the functions are: Heat transfer adhes ive · Seal ing adhes ive · Adhes ive seal ing adhes ive · Three-proof coat ing Insulating adhesive requirements in battery modules run alongside thermal and structural duties at every joint.
The application of power batteries
Battery applications
structural adhesive Basic Requirements ：
• Al u mi n u m/ a l u mi n u m bo ndi ng st re ngth is high
• Agi ng resista nce to high a nd low te m pe rat u re s hoc k , do u ble 8 5 , 10 0 0 ho u rs
• High to ugh ness , low modu l us
structural adhesive
| RxSolution | JOMP 1603 A/B | JOMS 2018 |
| type /Type | Polyurethane structural adhesive | MS adhesive |
| characteristic Features | • 1 ：1• Black viscous fluid• AL/AL bonding strength > 10Mpa• Working temperature-40/125C• Rapid initial solidification 30min• Low modulus, high bonding strength | • 100:50• Operation time: 20min• Hardness A78• AL/AL bonding strength 7.2Mpa• Working temperature-50/120C |
Thermal conductive structural adhesive
Basic Requirements ：
• A l u m i n u m/ a l u m i n u m , a l u m i n u m/ P ET bo nd i ng st re ngt h is h ig h
• Hig h t he r ma l co nd uctiv ity 1 . 2 W / m k , 2 W / m k
• Ag i ng res ista nce 8 5 / 8 5 , 1 0 0 0 ho u r s .
• H ig h to ug h nes s , low m od u l u s
| RxSolution | JOMP 1665 (1.3W) A/B | JOMP 1665 (2W) A/B |
| type /Type | 1.3w thermal conductive structural adhesive | 2w thermal conductive structural adhesive |
| characteristic Features | • 1 ：1• Thermal conductivity 1.3w• 60min rapid initial curing• AL/AL high bonding strength >7Mpa• Flame retardant V0• Temperature resistance-40/85C | • 1 ：1• Thermal conductivity 2w• 60min rapid initial curing• AL/AL high bonding strength >7Mpa• Flame retardant V0• Temperature resistance-40/85C |
Thermal conductive potting compound
A p p l icat io n po i nts:
• F i l l t he b lade batte ry i nte r na l ly
• F i l l t he i ns ide of t he two – w hee le r batte ry
• T he d ro ne batte ry is fi l led w it h i nte r na l sea l i ng
• E nca ps u latio n of e ne rgy sto rage batte r ies a s k ：
• Low v iscos ity , se lf- leve l i ng , not easy to sett le
• Su ita b le fo r heat co nductio n betwee n ce l l/ modu le/ liqu id coo li ng
p late . A lso s u ita b le fo r p rotect io n a nd heat d iss i pat io n of e lect ro n ic
co m po ne nts .
• Fla me reta rda nt V 0
| RxSolution | JOMP 1680 A/B | JOMS 8250 A/B |
| type /Type | Polyurethane potting compound No return to demolition | Silicone potting compoundIt can be returned and dismantled |
| characteristic Features | • 100:16• Hydrostatic viscosity 1400 mPas• Hardness A85• Thermal conductivity 0.8 W/ m.k• Temperature resistance-50/130C• High bonding strength• Flame retardant V0 | • 1:1 molding• Hydrostatic viscosity 3500 mPas• Penetration 40• Thermal conductivity 0.75 W/ m.k• Temperature resistance-60/200C• Certain bonding strength• Flame retardant V0 |
JOMP 1680 Aging Test Report
| test item | unit | function | test result |
| Hot and cold shocks | MPa ， 1000h | shear | 11.67 |
| MPa ， 1000h | draw | 17.88 | |
| % ， 1000h | elongation | 6 | |
| Double 85 high temperature andhumidity | MPa ， 1000h | shear | 11.4 |
| MPa ， 1000h | draw | 10.97 | |
| % ， 1000h | elongation | 9 |
Polyurethane foam
Basic Requirements
Application 1: Two-wheeled battery pack foaming and potting
• According to the new national standard, the overall weight of the battery pack is reduced, and the weight of the old pottin compound 2kg needs to be reduced to less than 400g
• The density of foam is 0.3 and the flame retardant is V0, which meets the weight reduction requirements. Application 2: Replacement of plastic frame
• Plastic frame replacement, plastic cost 40RMB, foam cost 10RMB
| RxSolution | JOMP 1685 A/B | JOMP 1685（2#）A/B |
| type /Type | polystyrene foam | High hardness foam |
| characteristic Features | • 1 ：1• Hardness A85, which plays a supporting role.• heat insulation• Flame retardant V0• Temperature resistance-50/105C | • 1 ：1• Hardness D55, structural support role.• heat insulation• Flame retardant V0• Temperature resistance-50/105C |
Basic performance
• Viscosity: 600-2000 mPas. Ensure that the gap between the filling cylinders is 1-2mm
• Operation time: 90s. Ensure the automation and efficient production efficiency of the OEM
• Foaming ratio: 5 times foaming ratio, the final foaming density is 0.2-0.3, to ensure that the weight will not increase significantly even if it is completely filled
• Thermal conductivity: 0.03W/mk, good insulation effect
• Flame retardant: V0, good flame retardant effect under thermal runaway
• Bonding strength: 1-2mPa, large bonding area, overall bonding strength is large.
• Color: customized by customers, the original color is yellow, can be customized pink/blue or other colors.
Power battery production process (cylindrical filling)
Fill method:
• The battery pack is fully filled and the top cover plate serves as the cab floor. It can be used for cylindrical or soft-pack square shell batteries.
• The original liquid of hybrid models is 7.5kg, and that of pure electric models is 13.5-17kg
Introduction of 4680 scheme:
• The battery pack is assembled
• Automatic glue application machine, 20g/s-200g/s
• Apply glue according to the preset glue path for 90s
• The water flows flat and penetrates into the cell gap
• Start foaming and cover with lid
• Foam to the top and fill completely, 10-15min
Low density silicone potting
Basic Requirements
• Low density, density <1
• Ask for leveling
• Customer base: BYD, Tesla
| RxSolution | JOMS 8250（7#） |
| type /Type | Low density silicone potting compound |
| characteristic Features | • 1: 1 mixing ratio,• Viscosity 2000±300 mPa.s• Flame retardant HB, RTI =150℃,• Hardness Shore A 30, excellent noise absorption effect,• Density 0.63, Shore hardness 00 75±10 |
Seal the battery case
Basic Requirements
• CI PG, a certain degree of compression deformation, aging resistant, waterproof, high temperature rapid curing.
• FI PG, high bonding strength, drop resistance
| RxSolution | JOMS 2018 | JOMS 1820 |
| type /Type | MS adhesive | Single-component molding silicone |
| characteristic Features | • 100:50• Operation time: 20min• Hardness A78• AL/AL bonding strength 7.2Mpa• Working temperature-50/120C | • Single-component ointment• The color is transparent/white/grey/black• Hardness A38• Low compression permanent deformation• Rapid curing at 150 degrees for 25min |
Separate Retention, Heat Transfer and Protection in Lithium Battery Modules
Within lithium battery modules, an adhesive can retain a component, establish thermal contact or protect an electrical connection, but those duties should be specified separately. Mark each proposed application on the module drawing and identify which surface actually receives the material. A bond to a cell’s outer film differs from a bond to a bare housing surface, and the integrity of that film becomes part of the joint assessment. Why assume that an adhesive suited to a cooling interface is also appropriate for every insulating or structural location? Thermal conduction, electrical isolation and mechanical support are different requirements. Check the complete route from the cell to the cooling hardware and include the gap variation created by the real assembly. A stiff cured layer may restrain movement differently from a compliant material, while a foam used for support or isolation can serve a different role from a heat-transfer compound. Preserve intended vents, electrical contact areas and access points when defining the dispense pattern. It’s useful to decide how a component would be inspected or replaced before surrounding it with cured material. The thermally conductive bonding material category can support the heat-transfer discussion, with substrate descriptions and joint drawings attached. The remaining functions still need their own selection criteria instead of being inferred from a thermal property or a general resin-family name.
Check filling and interfaces before assessing the module
The processing plan for lithium battery modules should establish how material reaches the intended locations without trapping air or flowing into keep-out areas. Trial the dispensing route on representative components and inspect concealed regions as well as the visible surface. For mixed systems, follow the formulation’s preparation and mixing instructions; material that looks uniform at the outlet can still need a check for cure consistency in the assembled cavity. Curing a contained volume also requires attention to reaction heat and the condition of nearby temperature-sensitive parts. Treat a changed cavity shape or filling sequence as a process change that deserves evaluation. After cure, inspect alignment, bond coverage and access to the features that were meant to remain exposed. Compare electrical insulation and thermal behavior under defined assembly conditions rather than assuming that acceptable appearance establishes either function. Follow relevant environmental and mechanical conditioning with inspection of the interfaces, particularly film-covered surfaces and transitions between stiff and flexible parts. Delamination, cracked material and a damaged substrate are different failure observations and should be recorded separately. Module safety assessment remains an assembly-level activity; a material-family description cannot establish the behavior of the complete battery under a fault condition. The potting and encapsulating material category helps organize protective options for further evaluation. Keep process records and sectioned trial samples with the drawings so that changes in coverage or failure location can be traced to the actual manufacturing sequence.
Selection of the right grade from the full JOME product catalogue usually starts with drawings and service conditions. The companion piece on String inverter adhesive application point sits alongside this guide, the JOME adhesive factory in Shanghai lists every family, and the reach the JOME technical staff handles enquiries.