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Precise and reliable sealing for the battery cover tray

The battery tray must be sealed before the cover is mounted, as it is crucial to avoid any humidity entering the battery which can dramatically decrease performance and cause damage to the battery system and delicate cells.  In addition, hazardous gases need to be prevented from leaving the battery.

December 11, 2020

This demands a solution that provides total isolation from the inside and outside, through the constant and uninterrupted application of a bead of self-curing liquid sealant to ensure the long-term durability and performance of the battery.  Because the battery cannot be exposed to heat, materials such as one component (1C) hot butyl, two component (2C) polyurethane or 2C silicone that do not require oven curing are the most appropriate materials for cover sealing.

Regardless of the material, Atlas Copco SCA dispensing technology provides the high flow rates required to enable the precise application of sealant with a uniform bead.  Atlas Copco’s UP301 HD heavy duty displacement pump is designed from the outset to provide the short cycle times needed, with the ability to deliver a sealant volume of 301 cubic centimetres each double-stroke, making it the ideal choice for material volumes of up to 40,000 litres per year.

As with all Atlas Copco assembly solutions, SCA dispensing provides quality assurance and traceability as standard.  Utilising Atlas Copco’s advanced RTVision.t camera system, the sealant bead applied to the battery cover is inspected with real-time scanning to provide full in-line monitoring of the position, continuity and width of the bead.  Bead quality is essential in battery cover sealing due to the potential for gas leakages.  RTVision.t provides quality assurance by constantly monitoring the bead application and immediately detecting any gaps which are automatically repaired without the need for manual intervention.

With innovative joining technologies and a wealth of expertise in EV battery assembly, Atlas Copco is your strategic partner for electromobility.  Take a look at our video to see how we can help with your electromobility needs.