Leading the Way in Advanced Materials Solutions


Fralock supports rapid growth in the energy storage sector by providing battery pack manufacturers with high-reliability component solutions. Battery manufacturers face a multitude of challenges, including design and production of batteries that optimize power, energy density and charging time, maximize cycle life and application value, while minimizing cost, simplifying manufacturing, and ensuring operational safety.

Why Consider Fralock?

Quality Critical Components

Fralock has built its reputation as a problem solver by leveraging our expertise in material selection and manufacturing, and “designing in quality” from the start. With extensive materials expertise, a variety of manufacturing capabilities, and a robust quality system, Fralock provides critical components to satisfy the most rigorous requirements.
  • Our expertise in thin, flexible materials enables design improvements including more compact designs for smaller batteries with higher power density.
  • Robust sealing solutions provide lasting protection from external elements, promoting longer battery life.
  • Simplifying assembly, decreasing recycling costs – we design application aids that reduce assembly time, increase placement accuracy, reduce costs, and increase throughput. By using alternative materials, we can simplify disassembly time and costs.
We’re able to provide the greatest impact during initial product development. We work closely with you to design, prototype, test, and manufacture a variety of battery components. Decades of materials expertise and engineering experience allow us to provide our customers with high-value effective solutions for industry sectors such as aerospace, EV vehicles, grid-based energy storage systems, medical, military, motive industrial, stationary telecom, and more.
  • Our broad range of materials gives you greater flexibility in design and manufacturing in a one-stop-shop, with specialty engineered materials (foams, rubbers, elastomers, silicones, polyimides, laminates, pressure sensitive adhesives), flex circuits and heaters, and ceramics

  • Innovative Flexible Circuits – In addition to traditional flex circuit technology, Fralock offers proprietary adhesiveless polyimide lamination for flex circuits that mitigates delamination, accommodates tight radius bends, and extends circuit life in harsh conditions.
Fralock offers custom components for the following:

Battery Packs


Thermal management is an important element of battery design and operation. When a battery is charged or discharged, it generates heat due to the internal resistance of the cell and the conversion of energy. This heat can cause a range of issues, including reduced battery performance, degradation of the cell’s components, and safety hazards like thermal runaway and fire.

To control these issues, several methods are used, including passive cooling and thermal insulation. Fralock offers extensive expertise in designing and manufacturing passive and insulative components using highly effective engineered materials.

Thermal Interface Solutions – Silicone and Graphite-Based Materials, Gap Fillers, Thermal Stops/Blocks (DuPont™ Cirlex®)

Gaskets, Sealing Solutions for Batteries

Gaskets and sealing solutions are used to prevent the escape of gas and liquid electrolytes in batteries during normal operation or in the event of overpressure.

Sealing is also critical to prevent the ingress of external contaminants which can interfere with the operation of the battery. This is especially important for batteries that are used in harsh or outdoor environments.

The materials selected for gaskets are suited for pressure-resistant sealing and protection against rupture and damage. These materials are designed to withstand excessive gas pressure that may be generated by prolonged short-circuiting, fire that can occur after improper disposal of a used battery, during charging or discharging, and incorrect installation of the battery into its device.

  • Internal Gaskets, Gap Pads – used for a variety of functions: sealing, insulation, vibration dampening, and compression.
  • Environmental Sealing – Typically gaskets that protect from outside dust, dirt, wind, and moisture. Our sealing gaskets can also include EMI/RFI properties.


Typical materials are:

Foams, Rubbers, Elastomers

Gaskets and Sealing Solutions
Batteries Current Collectors

Current Collectors

Current collectors are essential components in batteries that facilitate the transfer of electrons between the electrodes and the external circuit. This component can develop problems such as corrosion, mechanical failure, and overheating. Metals such as copper, aluminum, and nickel can corrode over time due to exposure to the electrolyte or other environmental factors, leading to reduced conductivity and performance.

Fralock’s sets itself apart with our unique manufacturing and converting capabilities, materials expertise, and ability to hold tight tolerances. This enables us to provide unsurpassed quality workmanship standards that mitigate corrosion and failure, and routinely meet our customers high expectations.

Battery Management Systems (BMS)

Flexible and Rigid-Flex Circuits, Flat Flexible Cables, and Heaters

A Battery Management System (BMS) is an electronic regulator for monitoring and controlling the charging and discharging of rechargeable battery packs, ensuring they operate safely and efficiently. The BMS can be built using flexible electronics that replace rigid PCBs. Flex printed circuits (FPC) are compact and flexible, which makes them ideal for use in applications where space is limited such as a BMS.

There are several applications for flex circuits and flat flexible cables in a BMS system:
  • Connect the battery cells to the BMS. In a multi-cell battery system, flexible circuits can be used to connect the cells together in series or parallel configurations, allowing the BMS to monitor the voltage and current of each cell individually.


  • Connect the various components of the system to the BMS. For example, a flex circuit may be used to connect the battery cells to the BMS controller, which is responsible for managing the charging and discharging of the battery.


  • Connect various BMS components together: temperature sensors, current sensors, and voltage sensors, and cells to the sensors.


  • Flexible heaters can be used to heat battery packs in environments of extreme cold temperatures, such as space, and high-altitude and latitude environments.


Battery Management Systems
Why Use Flex Circuits Over Rigid PCB?

  • Space and Mass Reduction – In applications where space and weight are restricted, FPC’s and heaters may be optimal. With a low profile and light weight, and FPC can fit into small areas with tight spaces and save in weight compared with a rigid PBC.

  • Increased Design flexibility – Flexible circuits and heaters can be designed to follow complex 3D shapes or curves, which can enable new design possibilities and product features that would be difficult to achieve with traditional rigid circuit boards.

  • Cost savings – In some cases, the use of flexible circuits can reduce costs by reducing the amount of interconnects and parts needed, saving in material and manufacturing costs, as well as simplifying assembly, installation, and disassembly.

  • Fralock offers all-polyimide adhesiveless technology, which provides superior performance and durability in extreme environments. We offer a range of flex circuit and rigid-flex assembly types and sizes from large format flat power cables to compact signal circuits.

Fralock’s flexible polyimide printed circuits provide extremely high reliability for your critical BMS system. More than just a fabricator, we offer innovative solutions to help overcome your engineering problems. Our highly experienced engineering  team works closely with you to fulfill the stringent requirements that batteries demand. To insure quality of your product, we offer design, prototyping, testing, production, to complete assembly.

Thermal Runaway Barriers and Battery Thermal Runaway Protection

Battery thermal runaway is a phenomenon in which an increase in temperature within a battery causes a chain reaction that leads to further heating and potentially to a fire or explosion. For thermal runaway prevention, several measures can be taken, including using materials and designs that can block heat, and block or retard flame. Fralock provides thermal insulation for batteries, fire-protection tapes, foams and films for battery modules and battery packs to enhance their thermal runaway prevention systems.

We offer:

Electrical Insulation, Dielectric Films and Tapes

Electrical insulation helps prevent sparking and short circuits, improving battery safety and reliability. Shorting can occur between the anode and cathode, and between the electrodes and the battery casing. To prevent these short circuits, batteries are designed with insulative materials such as:

Fire Resistant/Fire Retardant – Nomex®, fire-retardant polycarbonates, fire-retardant polyethylene and polyimides (DuPont™ Kapton®, Cirlex®), Avery Dennison Flame Tough™ PET, 3M flame barrier films, Lexan®, Kevlar®, Vespel®, fire-retardant polypropylene (Formex™), fire resistant/fire retardant PSA tapes, Lexan™ films

Thermal Runaway in Battery

EMI/RFI Shielding

EMI/RFI (Electromagnetic Interference/Radio Frequency Interference) shielding is essential in batteries that are used in electronic devices. EMI/RFI can interfere with the proper functioning of electronic devices, causing performance issues or even complete failure.

EMI/RFI shielding involves placing conductive materials between the electronics and interfering electromagnetic radiation.

Fralock EMI/RFI materials:

Electrically conductive elastomers, foils, fabrics, tapes, and adhesives wire mesh, mesh/elastomer combinations.

Ruggedization - Vibration Dampening and Sudden Impact

Vibration dampening and sudden impact resistance are important considerations for design in batteries used in applications that are subjected to mechanical stresses, such as vehicles, power tools, or portable electronics. In conjunction with proper battery securement, using materials with high shock absorption and impact resistance is highly effective for minimizing these issues.

Fralock Provides solutions using Foams and Rubbers:

Silicone, polyurethane, polyolefins, Rogers Poron® (urethane foam), Rogers Bisco® (silicone foam), specialty laminates, Viton™  , Neoprene, NBR (natural Buna rubber), EPDM, 3M™ VHB™ (very high bond adhesives), fluorosilicone foams and solids

Ruggedized Battery
Precision Die-Cutting 

Precision Die-Cut Manufacturing

We offer extensive capabilities and engineering experience in die-cutting for a wide array of shapes and sizes to fit your requirements. We leverage five decades of high-precision fabricating of advanced materials to satisfy your needs. Our customers rely on us to provide, high-performance, reliable parts. 

Fralock produces custom parts including pouch cell enclosures, TIMs, EMI/RFI shielding parts, gaskets, seals, labels, and other thin film battery applications.

Fralock’s Battery Components Work in a Range of Applications

  • Battery Electric Vehicles (BEVs) – powering propulsion for specialized industrial vehicles, marine-based vehicles, aircraft.
  • UPS Systems – backup power for critical applications such as medical equipment and lighting, utilities stations, telecom battery backup systems.
  • Medical equipment – powering:
    • Small wearables, insertable and implantable active devices including, heart monitors, insulin pumps.
    • Mobile equipment including EMCO machines, ventilators, and monitoring devices.
  • Military War Fighter equipment – powering radios, headsets, telecom safety base stations, phones, walkie talkies, respiratory communication systems, thermal imaging cameras.
  • Satellites and Spacecraft
  • Power Tools – Industrial batteries for heavy use tool such as table and circular saws, routers, drills, drill drivers, impact drivers, grinders, nail guns, rammers, and vacuums.

View/Download  Literature

Ask us about your next project!
UPS Battery System
Battery Component for Fighter Equipment
Electric Circular Saw
Battery Component for Medical Equipment
Satellites and Spacecraft Battery System