Inside and outside the cell, we have the market leading technology portfolio of specialty materials for battery systems to increase efficiency, safety and reliability
Despite the impressive progress in lithium ion energy storage technologies achieved today, the challenges faced by battery systems remain significant in terms of energy densities, cost optimization and improved safety performance and durable cycle life. Our innovation for battery systems aim towards developing cutting-edge solutions for next generation vehicles. Our solutions help to optimize a better performance and improve the battery energy density, duration, weight reduction and recharging time. Our market-leading portfolio of solutions is available for battery cover applications inside and outside the cell, from cell to module and battery pack assembly up to battery system integration into the vehicle.
Inside the battery cell
The battery cell is a key component where the chemical energy converts to electrical energy. The cell contains the anode, cathode, electrolyte and a separator. The particles of the active material are held together with the special binder. The electrons flow from anode to cathode through external circuit, while ions move from anode to cathode through electrolyte. When battery is connected to an external circuit, the chemical reactions occurs to generate the energy.
Our solutions help to improve the chemical reactions inside the cell to boost the battery performance in terms of charging time, prolonged lifecycle and high energy density.
Separator membrane coating
The separator is an electrically insulating membrane placed between the anode and the cathode. Yet, it shall still enable the exchange of lithium ions from the anode to cathode in the charging process, and other way around in the discharging mechanism. To improve the cell assembly process and/or to improve the overall cell performance, special coatings can be applied to each side of the separator. Kynar Flex®LBG series has been specifically designed for this application; it brings superior adhesion to the electrodes and high dimensional stability to the assembly under high voltage condition. With its extreme performance, Kynar® is the resin of choice inside a Lithium ion cell.
Although the binder represents only a fraction of the battery weight and cost, the Kynar PVDF binder is fundamental during the electrode manufacturing process. Its design is key to ensure fast dissolution, high slurry content, fast casting or looking further allowing greener and more sustainable manufacturing processes. Meanwhile, while being characterized as an inactive material, the Kynar PVDF binder is an extremely active material during battery cycling. It manages volume variations and side reactions of high energy density active materials which helps to maintain a firm structure of electrodes. The Kynar® PVDF HSV series are the binder of choice for this highly demanding application.
Ultra-pure lithium electrolyte salts
Electrolytes ensure the flow of lithium ions within the battery, which is directly linked to battery lifecycle. To guarantee long-term performance, electrolytes can be improved using Foranext® electrolyte salts.
LiFSI has the highest ionic conductivity among all lithium salts, remarkable electrochemical (>5V) and thermal stability and is fit to be used as main salt or additive.
LiTDI is an additive that helps to increase battery lifetime, due to several properties:
- Solid Electrolyte Interface (SEI) stabilization,
- HF and water scavenging,
- Aluminum current collector passivation.
We provide full expertise in electrolyte solutions for lithium battery development and we are ready to discuss your projects.
Multi-walled CNT as conductive additive
Graphistrength® multi-wall carbon nanotubes (MWCNT) is a highlight of Arkema’s development in nanomaterial technology and are the conductive additive of choice for high-performance electrodes. Indeed, electrical conductivity is key in the development of high energy density and higher charge and discharge of the lithium ion batteries. Graphistrength®-containing composite electrode materials- achieve better electromechanical performance by providing an efficient electrically conductive network in battery electrodes.
Graphistrength® MWCNT is the cutting-edge solution to improve the cycle of life of next generation electric vehicles. Graphistrength® MWCNT is versatile and adaptable to different needs as lithium cell geometry as well as the manufacturing process of the electrodes. Our team helps customize MWCNT in dispersions based on different solvents for different specification requirements.
Cell to module assembly
The module is a component of the HEV and BEV that holds together a group of battery cells.
Module assembly plays a key role in protecting the cells from shock and vibration that occurs during vehicle operation.
Battery module architecture is crucial for battery system thermal management; therefore, it can incorporate heating, cooling or heat exchange systems.
Smart adhesives and sealants
Bostik smart adhesives provide a large portfolio of solutions covering bonding, cell-to-cell and cell-to module assembly and encapsulating. Pouch, prismatic or cylindrical, we cover all cell types’ assembly into modules to provide mechanical integrity between the cells and ensure its safety and reliability as well asthermal management. Our solutions are designed to protect battery cells and modules from moisture intrusion, various chemical fluid leaks and exposure to outside environment.
- Easy-to-process and solvent free sprayable adhesive solutions (pressure sensitive and waterborne adhesives) for pouch cell-assembly
- Tailor-made 2K polyurethane adhesive materials for prismatic cells module assembly
- Best-in-class MMA based adhesives predestined for cylindrical module bonding with an optimal balance of key properties
- Hot melt polyamide adhesives for encapsulation applications, bolstered by our leading position in specialty hot melt adhesives
- Thermal conductive adhesives if, in addition, heat transfer and thermal management is required
Battery pack sealing and enclosure
Smart adhesives and sealants
Sealants play a crucial role in battery pack enclosure for their role to protect the battery from exposure to elements that might affect its performance.
Bostik smart adhesives and sealants are lightweight solutions that help to reduce battery system weight that often takes up a large space and weight on the vehicle floor. Bostik is the sealant of choice for battery pack assembly and it is tailor-made to address the needs for removability and adaptability to high-speed manufacturing processes in the automotive OEM. To assemble the pack, adhesion to different substrates are the key element because the battery pack is made from various metals or composite materials. Our comprehensive portfolio of adhesives combined with our expertise in the automotive industry provide the right solution for our clients.
Our battery pack sealants and adhesives contribute to battery system lifespan providing protection thanks to:
- Extreme flexibility
- Excellent durability
- Excellent sealing performance and air tightness
- Serviceability or removability for post repair
- Excellent adhesion with limited surface treatment
- Rapid and precise application enabling high speed automated manufacturing
Our battery pack sealants and adhesives solution technology portfolio contains:
- Battery pack sealing and gasketing: SMP (Silyl Modified Polymers), Butyl, HMPSA (hot melt pressure sensitive adhesives), Synthetic rubber, CIPG/UVFG
- Structural bonding battery pack: MMA (methyl methacrylate), Instant adhesive (2K Cyanoacrylates), 2K-PU (polyurethane)
The battery pack and enclosure are subject to extreme environmental conditions such as vibrations and shocks that can eventually affect the battery lifespan. Battery pack application materials require high mechanical properties and high durability to protect the battery’s functioning. In vehicle energy storage systems, often the mass of non-energy storing components take up a large space and adds to a significant weight. Therefore, advanced thermoplastic composites are key for lightweight structural storages development in next generation BEV and HEV vehicles.
Elium® is the first thermoplastic resin designed for manufacturing composite parts with highly performing mechanical properties. Elium® is a game changing resin that helps solve the challenges that the automotive industry faces:
- Lightweight: 30% to 50% lighter than identical parts made out of steel
- Mechanical properties: while being lighter than metal provides the same level of resistance
- Recyclability: possibility to recycle via de-polymerization
Encapsulating case coating
The EV battery location in a vehicle’s bottom, near the rear wheel, is in a critical zone for possible damage from external bodies, such as stone chipping. Material requirements for encapsulating cases include mechanical resistance, corrosion resistance as well as insulation properties in order to ensure battery lifespan longevity.
Our Rilsan® Fine Powders high performance solutions are the material of choice for battery metal case coating. Rilsan® Fine Powders are bio-sourced thermoplastics made from castor plants are suited for extreme condition applications requiring high resistance and durability. Its main coating application’s specific properties are excellent resistance to damage (such as stone chipping), excellent corrosion resistance, high insulation properties and low coating thickness (<200 µm).
Battery management system
Battery management system (BMS) is an electronic system built with the battery pack.
BMS monitors the state of the battery for various performances such as voltage, temperature, state of the charge and safety. We offer cutting-edge technology solutions to address the most critical challenges to help improve the battery management system.
From piezoelectric polymers for sensors and high performance thermoplastic coatings to hot melt polyamides for encapsulation and low pressure molding applications, our offer for battery management system are designed to enable effective power distribution and improved battery lifetime.
Piezoelectric polymers for sensors
Lithium ion batteries are prone to gradual capacity fade due to electrochemical processes such as active material dissolution or electrode particle cracking and electrode adhesion degradation. Battery state of health (SOH) is a critical measurement for reliable and durable operation of lithium ion batteries.
We developed revolutionary piezoelectric polymer for efficient battery cell monitoring through non-invasive acoustic and ultrasound measurement. P(VDF-TrFE) piezoelectric copolymers, Piezotech® FC, are very sensible to acoustic waves and ultrasounds. Data collected thanks to their sensibility and their integration into a battery help to improve battery lifetime and management.
Battery busbar coating
BEV and HEV applications require the highest resistance material to guarantee sustainable and durable operations of the vehicle. One key component of the battery system is the busbar. Busbar combines a system of electrical conductors, which collects and distributes current to power vehicles’ subsystems. This power distribution component consists of copper or aluminum conductors and insulation coating for high-temperature and high-temperature applications.
Our bio-sourced Rilsan® PA11 is the coating material that responds to busbars needs for extreme performance. Rilsan® provides exceptional abrasion resistance as well as thermal and chemical resistance.
Wire insulation coating
Wires and cables in vehicles operate in challenging environments and the materials must meet highly demanding requirements in resistance and durability.
Kepstan® PEKK polymer is the extreme material of choice for wire insulation designed to respond to highly demanding automotive application needs. Kepstan® PEKK insulated wires provide superior chemical resistance and thermal endurance required by a battery system. Kepstan® is valued in the automotive industry for its high resistance to abrasion, intensive pressure, as well as aggressive fluids of the vehicle.
Encapsulation & Low Pressure Molding of electronic components
Electronic components such as sensors and critical connector interfaces require durable and waterproof solutions with suitable mechanical and thermal properties, which address flammability concerns as well.
Our Thermelt™ Hot Melt Polyamides and Born2Bond™ engineering adhesives such as UV Cyanoacrylates are perfectly adapted for encapsulation and protection of these critical components. In the Low Pressure Molding (LPM) applications, our moldable hot melt polyamides offer a durable and bio based solution, with increased production efficiency and unmatched opportunities for material design. For conformal coating applications, our low-odor, low-blooming and dual curing cyanoacrylate adhesives offer rapid bonding through transparent parts as well as effective cure between opaque substrates. With our global R&D and technical support, we strive to provide you with the right solution for the protection of critical electronic components:
- Hot melt polyamide for encapsulation and low pressure molding (LPM) applications bolstered by our leading position in specialty hot melt adhesives
- Encapsulation: hot melt polyamides, engineering adhesives, UV acrylics
- Encapsulation for electronic components (sensors, connectors)
- Encapsulation and protection of critical connector interfaces