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At a Glance: Battery Potting & Encapsulation

• Battery potting and encapsulation help protect battery packs from moisture, chemicals, vibration, shock, and other environmental hazards while improving long-term reliability.
• A variety of resin systems, including epoxy, urethane, silicone, acrylic, and polyester, can be selected based on the application's environmental, thermal, electrical, and mechanical requirements.
• Potting fills an enclosure around the battery assembly, while encapsulation creates a protective shell around the battery pack using a reusable mold, with both methods providing enhanced durability and electrical insulation.

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Battery Potting

Potting is the process of partially or completely filling or embedding an enclosure with a compound for the purpose of providing resistance to shock and vibration, as well as creating a seal against moisture, solvents, and corrosive agents. Potting compounds are also used to aid with electrical insulation, flame retardency and heat dissipation.

The most common types of potting compounds are polyurethane, acrylic, epoxy resin, and silicone. These materials vary in hardness from very soft to hard and rigid, and are designed to withstand many different types of environments. Each of these chemistries does have its own strength and weaknesses though. Determining which compound is best for your application will be based on operating and environmental conditions, material physical properties, and processing needs.

Battery Pack Potting Process

Watch this short video to learn more about what is involved in the potting process of a custom battery pack.

Benefits of Potting:

• Low cost shells
• Hermetic like seal
• Good electrical insulation
• Can withstand environmental extremes
• Many different materials with different cured properties

Read more about this topic in our blog post, Common Applications and Benefits for Battery Pack Potting

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Battery Encapsulation

Encapsulation is a process similar to Potting. With encapsulation instead of filling a mold with a compound like during the potting process, the electronic assembly is impregnated inside the compound with the help of a reusable mold. Typically the reusable mold is made out of hard to adhere to materials such as Teflon or Silicone. The purpose of encapsulation is to create a protective “shell” around the battery assembly.

Encapsulation provides resistance to shock and vibration, as well as creating a seal against moisture, solvents, and corrosive agents. Encapsulation is also used to aid with electrical insulation, flame retardancy and heat dissipation.

Benefits of Encapsulation:

• Low cost of reusable molds
• Many different materials with varying cured properties
• Good electrical insulation
• Hermetic like seal
• Good resistance to environmental extremes

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Common Resin Manufacturers

• Henkel
• Lord
• Masterbond
• Locktite
• Dow Corning

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Frequently Asked Questions

Quick Links

• What is battery potting?
• What is the difference between battery potting and encapsulation?
• Which materials are commonly used for battery potting and encapsulation?
• What are the benefits of potting or encapsulating a battery pack?
• When is vacuum encapsulation used?

What is battery potting?

Battery potting is the process of partially or completely filling a battery pack enclosure with a protective compound. This material helps protect the battery assembly from shock, vibration, moisture, solvents, and corrosive substances. Potting can also improve electrical insulation, support flame retardancy requirements, and aid in heat dissipation. The specific potting material chosen depends on the environmental and performance requirements of the application.

What is the difference between battery potting and encapsulation?

While both processes protect battery assemblies, potting typically involves filling an enclosure with a compound that surrounds the battery components. Encapsulation uses a reusable mold to create a protective outer shell around the assembly itself. Both methods offer similar environmental and mechanical protection benefits, but the selection often depends on product design, manufacturing requirements, and service expectations.

Which materials are commonly used for battery potting and encapsulation?

Common resin materials include epoxy, urethane, silicone, acrylic, and polyester compounds. Each material offers different characteristics in terms of hardness, flexibility, chemical resistance, thermal stability, and environmental protection. Choosing the most suitable resin requires consideration of operating temperatures, exposure conditions, mechanical stresses, and processing requirements.

What are the benefits of potting or encapsulating a battery pack?

Potting and encapsulation can significantly improve battery pack durability and reliability in demanding environments. These processes provide protection against moisture ingress, chemicals, vibration, impact, and corrosion while enhancing electrical insulation. They can also create a hermetic-like seal and help battery systems withstand challenging environmental conditions over extended periods of use.

When is vacuum encapsulation used?

Vacuum encapsulation is used when voids or trapped air within the resin are undesirable. By performing the encapsulation process under vacuum pressure, the resin can more completely fill spaces around components and reduce the likelihood of air pockets. This approach is particularly beneficial for applications that demand maximum environmental protection, reliability, and long-term performance in harsh operating conditions.

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