The sealing component of the battery pack is a key accessory to ensure the safety and stability of the battery system

Performance requirements and core characteristics of battery pack seals

The sealing component of the battery pack is a key accessory to ensure the safety and stability of the battery system, and its performance needs to meet multi-dimensional and rigorous standards. Firstly, high temperature resistance is a fundamental requirement. Due to the high WFM temperature generated by long-term operation of the battery pack, the sealing components need to maintain elasticity and sealing performance in high temperature environments. Secondly, chemical resistance is essential as it must resist corrosion and damage from chemical substances inside the battery pack. In addition, sufficient strength, wear resistance, and aging resistance are required in terms of mechanical performance to cope with physical wear and tear during long-term use.

Mainstream seal types and material selection

Seal type

The battery pack seals on the market are mainly divided into three categories: rubber seals, adhesives, and sponge tapes. Among them, rubber seals are widely used in harsh working conditions due to their advantages of reliable sealing, reusability, and easy assembly, especially in scenarios where sealing requirements are higher than battery packs.

Core material: Ethylene propylene diene monomer (EPDM) rubber

Performance advantages: EPDM rubber material with a Shore A hardness of 50 degrees has excellent elasticity, good water and oil resistance, and is the mainstream choice for rubber seals.

Application of recycled materials: EPDM recycled rubber is prepared by recycling waste rubber, which is environmentally friendly and economical. Its elasticity and wear resistance can meet the requirements of seals, and the cost is low, which can effectively reduce the manufacturing cost of battery packs.

Structural design and optimization of sealing performance

Sectional structure design

The cross-sectional structure of the seal directly affects the sealing effect. For example, symmetrical structural design can make the contact stress between the upper and lower sealing surfaces uniform (about 2.9 MPa), improving the overall sealing performance; Although asymmetric structures can adapt to larger dimensional tolerances, the difference in contact stress between the upper and lower parts may lead to weak local seals. In addition, the sealing element needs to match the outer edge of the battery pack, and the corner design should be concave and convex, and the compression amount should be limited by a metal ring in the installation hole to prevent excessive compression.

Patent technology innovation

The latest patent proposes a "bonding area+non bonding area" bonding surface design: the bonding area is bonded to the battery cell group or tray beam, and the non bonding area is located at the bending part, which can reduce the constraint force during expansion, ensure that the bending part is fully bonded, and avoid leakage of the adhesive space.

Please provide the following information to facilitate the accurate quotation of our factory personnel!

1. Dimensional drawings or samples of products

2. Product hardness color requirements (no relevant information we will be customized according to conventional industry standards for you)

3. The quantity requirements of the product (the more the relative number of customized goods, the more cost-effective)

4. The time of product production and processing (the time is related to the number of products and whether the mold is opened. The normal time is 3-10 days)

Rubber material description:

Silicone (VMQ): high temperature resistance, non-toxic, good water resistance, oil resistance general temperature resistance (-60~350) Butanning rubber (NBR): good oil resistance, good sealing effect, temperature resistance (-50~120) fluorine adhesive (FPM): wear resistance, high temperature resistance, oil resistance, corrosion resistance, good aging resistance, Temperature resistance (-20~300) EPDM: good aging resistance, poor oil resistance, temperature resistance (-50~150) Natural rubber: good elasticity, good alkaline resistance, poor oil resistance, temperature resistance (-30~110)