Enhanced lifetime and long-term hermeticity through thermally stable and
electrolyte resistant glass sealing
Rechargeable energy storage sets the stage for numerous applications. Lithium-ion technology is currently the most powerful solution for e-mobility and stationary applications in the field of renewable energies. In order to provide a steady and long-lasting performance, energy storage devices need to be hermetically encapsulated.
High power lithium-ion batteries are typically encased in a light and stable aluminum cell. The battery terminals typically represent the weak point of these cells, as they need to facilitate the conduction of electrical power through the hermetically sealed housing walls.
To achieve long-term hermeticity of the battery, the materials for insulating the terminals must fulfill two key criteria:
• long-term stability at high temperatures and temperature changes
• reliable resistance against chemical corrosion
While standard polymer sealing materials may often fail to meet these requirements in long-term operation due to their organic nature, SCHOTT’s glass-to-aluminium sealing (GTAS®) technology for battery terminals has been developed to enable a cell design with durable hermeticity. The specially selected glass type is highly resistant to lithium electrolytes and HF as well as high temperatures.
SCHOTT’s glass-to-aluminium sealed (GTAS®) battery lid systems offer :
Enhanced battery lifetime and long-term hermeticity through
With their high energy density, lithium-ion batteries are already widely in use in consumer electronics. As the product life cycles are very short (usually less than 3 years), simple pouch cells made from organic plastic are considered sufficient; this material, however, ages naturally at the cost of its hermeticity and security. For applications requiring increased battery lifespan, as in e-mobility or in the wind and solar technology, for example, materials with significantly enhanced durability are necessary. These are provided by SCHOTT with its glass-to-aluminum sealed battery lid systems.
Since the 1930s, SCHOTT has been manufacturing hermetic housings using its Glass-to-Metal Sealing Technology (GTMS). This technology is well-proven in sealing battery covers of lithium thionyl chloride (Li-SOCl2) batteries. Based on more than 20 years of sealing experience for primary batteries, the innovative glass-to-aluminum sealing technology was specifically designed for long-lasting lithium-ion batteries and capacitors.
Sintered glass preforms are melted around the conductors to provide electrical insulation, enhance mechanical strength and center the conductors in the openings for the feedthroughs. The special glass is matched to the metal – in this case aluminum – with respect to its coefficient of thermal expansion, creating a natural compression during cooling. The conductors remain firmly fixed by the solidified glass, even if mechanical pressure is applied or the temperature changes dramatically.
SCHOTT delivers complete lid systems for prototypes and high volume mass production. They can be integrated easily into existing production processes and meet the automotive industry’s strict targets and delivery requirements.
• Mechanical resistance: High
• Temperature stability: –40 ºC to +85ºC
• Pressure resistance: High
• Chemical resistance: High
• Long lifetime: up to 15 years depending on design
Standard lid dimensions (in line with the German Automobile Industry Association)
(length x width)
• Hybrid, prismatic: 120 x 12,5 mm
• Plug In-Hybrid, prismatic: 173 x 21 mm and 148 x 26,5 mm
• Electrical, prismatic: 173 x 32 mm and 173 x 45 mm
• Hybrid, cylindrical: Outer diameter 37,6 mm
Our products are all customized. Please contact your local expert for more information.
All our Automotive Division production facilities are TS 16949 certified. For more information, please refer to our quality assurance processes.