With the large-scale application of photovoltaic and energy storage systems, the bonding and fixing process of battery cells as the core of energy storage battery systems is increasingly valued by the industry. Especially in the integration process of large battery modules, it is not only required that the adhesive has high-strength adhesion, but also multiple performance indicators such as waterproof, dustproof, anti-aging, and environmental protection should be taken into account. In practical applications, many conventional sealants face problems such as poor coating adaptability, narrow bonding range, strong odor, and inconvenient construction, which seriously affect the reliability and manufacturing efficiency of energy storage systems.
Adhesive bonding of photovoltaic energy storage cells
To address the above challenges, this article will share the application case of ELAPLUS multifunctional polyurethane sheet metal sealant PUR 1655 in the “photovoltaic energy storage cell bonding and fixation” project, analyze its outstanding performance in complex environments, and provide reliable material solutions for new energy enterprises.
1、 Project background: Challenges faced by battery cell bonding
In an energy storage system, the arrangement of battery cells is usually a regular parallel or stacked layout, which is then packaged into battery modules. The entire module needs to go through the following operational challenges:
High requirements for structural bonding strength: During transportation and use, battery cells need to withstand vibration and thermal shock. Colloids must have high modulus and bonding strength to avoid loosening and detachment.
High long-term aging resistance requirements: Photovoltaic energy storage systems typically have a service life of over 10 years, and outdoor installations require colloids to not age or crack in environments such as ultraviolet radiation, humidity, rain, and snow.
High requirements for process friendliness: When producing in large quantities, it is required that the colloid is easy to operate, easy to apply, free of primer, fast to apply, and compatible with coating requirements.
Strict environmental and safety standards: Energy storage systems are commonly used in households, industrial and commercial settings, and adhesives must meet environmental standards such as solvent-free, low VOC, and no irritating odors.
For the above usage scenarios, customers urgently need a bonding sealant product with balanced performance, convenient construction, and long-term stability.
2、 Recommended material: PUR 1655 multifunctional polyurethane sealant
To meet the bonding requirements of energy storage cells, Elaplus recommends using PUR 1655 polyurethane sheet metal adhesive. This product is a single component, moisture curing sealing adhesive with medium to high modulus, excellent adhesion, and durability. It is widely used for sheet metal structure sealing in fields such as automobiles, rail transit, refrigerated containers, and construction.
Core performance characteristics:
Performance Description
Strong adhesive force can firmly bond various materials such as aluminum shells, stainless steel, composite plates, plastics, etc. of battery cells, forming a durable structural bond.
Excellent aging resistance, long-term resistance to ultraviolet radiation, humidity, rain, snow, and chemical corrosion, suitable for outdoor or complex environments.
Non primer construction can directly bond most substrates without primer treatment, saving process time.
Green and environmentally friendly, solvent-free, odorless, in compliance with ROHS and REACH environmental regulations.
Compatible with painting, the surface can be sprayed or electrophoretic treated after drying, suitable for vehicle/equipment painting processes.
Good resistance to dynamic fatigue performance with high modulus design, adaptable to changes in equipment vibration, thermal expansion and contraction, and other working conditions.
3、 Application design: Bonding of photovoltaic energy storage cells
- Adhesive structure description:
In this project, the customer assembled multiple square aluminum shell cells in a single-layer arrangement on a metal tray, bonded and fixed them with structural adhesive, and then packaged them in modules.
Cell material: Aluminum shell (anodized)
Bottom support material: galvanized steel plate
Adhesive method: dot coating+gap filling
Curing conditions: room temperature moisture curing, initial curing time of about 2-4 hours, basic curing within 24 hours - Colloid dosage and process characteristics:
Colloidal viscosity is moderate and can be applied by manual or automatic dispensing equipment
Can adapt to the edge/bottom bonding area of long battery cells, with good fluidity and shaping effect
No solvent components, no need for baking, no black edges, no volatile odors, friendly to operators
PUR 1655， Ideal choice for bonding and sealing of optical storage systems
Against the backdrop of rapid development of new energy storage, the structural safety, sealing, and long-term reliability of battery cells have become key indicators for battery module manufacturing. PUR 1655 polyurethane sheet metal adhesive, with its high adhesion, wide adaptability, and excellent durability, has demonstrated outstanding performance in the field of photovoltaic energy storage cell bonding, and is a reliable “adhesive” friend for promoting the development of integrated photovoltaic energy storage.
Elaplus will continue to focus on adhesive solutions in the field of new energy, providing full chain adhesive support for battery modules, PACK packaging, BMS control units, etc., to help stabilize the output and long-term use of clean energy.
Tag: Adhesive bonding of photovoltaic energy storage cells
