Key Applications of Polyurethane Structural Adhesives in Power Battery Packaging Processes
With the rapid advancement of the new-energy vehicle industry, the requirements for the safety, energy density, and lifespan of power batteries are becoming increasingly stringent. Adhesives play a crucial role in this context—particularly two key types of materials: one is thermally conductive adhesive, which boasts excellent thermal conductivity, and the other is structural adhesive, used to prevent cells from shifting within the battery pack. This article primarily introduces the applications and performance advantages of polyurethane structural adhesives.
Shanghai Hinnel
2025/12/03
Where is polyurethane structural adhesive mainly used in power batteries?
Cell fixing and bonding: The battery cells of power batteries need to be securely connected into a pack. Polyurethane structural adhesive can tightly bond individual cells within the module frame, and its bonding strength meets the industry standard of ≥ 15 MPa requirements, while also possessing excellent flexibility to absorb vibrations and impacts during vehicle operation, thereby preventing the cells from delaminating or cracking due to shaking. For example, BYD’s blade battery uses a thermally fused polyurethane adhesive to encapsulate the cells, significantly improving production efficiency and ensuring that the adhesive layer remains intact during the nail penetration test, effectively inhibiting thermal propagation.
Module and housing bonding: In CTP ( Cell to Pack ) Among mainstream battery technologies, polyurethane structural adhesives are used to bond battery modules to battery pack housings, with a peel strength ≥ 10N/cm , and in 120 It can maintain stable performance at ℃, enhancing the overall structural rigidity while reducing the use of structural components such as metal brackets, thereby contributing to the lightweighting of battery packs.
Why choose polyurethane structural adhesive?
Polyurethane structural adhesives boast excellent bonding strength and weather resistance, ensuring stable adhesion even in a variety of harsh environments. In addition, they exhibit superior impact and vibration resistance, effectively reducing damage to battery packs caused by vibrations during operation.
Product Recommendation:
Hinnel HNPU7003 Polyurethane structural adhesive series , intensity > 10MPa , flexibility, aging resistance, replacing bolts / Welding, alleviate Pack Weight, cushioning vibration and impact, preventing short circuits caused by cell displacement.
- Low VOC , conforms to ROHS/REACH
- Excellent resistance to aging and chemicals
- Both machine dispensing and manual mixing are available.
- Strong adhesion to various substrates
- High thermal conductivity, high toughness, high elasticity
Common problems during the application of polyurethane structural adhesives:
The bonding surface is not firmly bonded and easily falls off.
It could be due to inadequate cleaning of the substrate surface, the presence of oil stains, or excessively low construction ambient temperature. The substrate must be thoroughly cleaned, and construction should be carried out at an appropriate temperature.
Bubbles and pinholes appear in the adhesive layer.
This is often caused by excessive humidity in the construction environment, moisture on the substrate surface, or air being entrained during adhesive mixing. Before construction, ensure the substrate is dry and mix slowly to avoid introducing air.
The adhesive flows and overflows severely.
The sealant layer flows, usually due to excessively wide gaps, too thin a sealant layer, or tilting of the substrate during application. It is necessary to control the gap dimensions, apply a sealant of sufficient thickness, and adjust the substrate position.
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Shanghai Hinnel
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Key Applications of Polyurethane Structural Adhesives in Power Battery Packaging Processes
Shanghai Hinnel
2025/12/03
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