Lid Systems for Li-Ion Batteries

Product Description

battery
Leakage impacts battery capacity


For optimal performance in applications using lithium ion batteries, electrolytes must be prevented from leaking out of the battery cell and moisture must be kept from entering the cell. If the battery cell is not gas-tight, battery capacity will decrease over time and the improperly enclosed battery cell could also be damaged by the infiltration of atmospheric humidity.

Suppliers, manufacturers and customers alike all have an interest in minimizing capacity loss in the expensive batteries used in electric and hybrid electric vehicles.* 

A common cause of electrolyte loss is evaporation through the polymer seals of the battery terminals. Polymer, an organic material, ages naturally and can become brittle and lose gas-tightness over time.
 
lid
GTAS® Battery Cell Lids


are a newly-developed technology that eliminates electrolyte loss and prevents moisture intrusion into lithium-ion battery cells by employing a special glass seal for the battery terminals, replacing the organic sealing material.

As a result, the battery terminals are hermetically sealed into the aluminium lid (GTAS: glass-to-aluminium seals) and protect the battery cell from moisture intrusion and electrolyte evaporation through the pin seals.




* Source: http://advancedmanufacturing.org/testing-ev-batteries/ June 8, 2017 by Bill Koenig – Senior Editor

Advantages

SCHOTT´s Glass-to-Aluminium sealed (GTAS) battery lid systems offer:
  • A simplified lid design
  • High temperature resistance, ranging from –40°C to more than +125°C
  • Electrolyte-resistant glass sealing prevents humidity infiltration into the cell housing
  • Elimination of electrolyte leakage through the pin seals
  • Improved battery safety because of gas-tight cell housing

Depending on cell design, the battery can maintain higher capacitance and longer shelf life, even in harsh environment conditions such as extreme heat and cold.

Complete battery lid systems

SCHOTT offers complete lid systems with glass-to-aluminium sealed terminals for both prismatic and cylindrical-shape battery cells, as well as capacitors.

This brings added benefits:
  • Easy installation: The lid systems can be welded directly onto the cell case
  • Easy integration into existing production processes through customized designs
  • From prototype to mass production: SCHOTT is a reliable partner with full in-house development and production capabilities

Applications

With their high efficiency and storage capabilities, lithium-ion batteries are already widely used in consumer electronics. As product life cycles are very short (usually less than 3 years), simple pouch cells made from organic plastic are often considered sufficient. This material, however, ages naturally and loses hermeticity and security over time.

For applications requiring increased battery lifespan, such as e-mobility or wind and solar technology, materials with significantly enhanced durability are necessary. SCHOTT glass-to-aluminum sealed battery lid systems satisfy these more demanding material requirements.
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Technical Details

Technology

Since the 1930s, SCHOTT has been manufacturing hermetic housings using its Glass-to-Metal Sealing (GTMS) technology. This technology is proven for reliably sealing the battery covers of lithium thionyl chloride (Li-SOCl2) batteries.

Based on more than 20 years of sealing experience for primary batteries, 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 of the feedthroughs. The special glass is matched to the metal – in this case aluminum – with respect to its coefficient of thermal expansion, creating natural compression during cooling. In its application, the conductors remain firmly fixed by the solidified glass, even if mechanical pressure is applied or the temperature changes dramatically.
Specifications  
Electrical isolation Small designs: 108 Ω to 109
Large designs: 107 Ω to 108
Chemical resistance High against range of standard
electrolytes
Termperature
resistance
High
(from +40°C to + 125°C and more)
Pressure tightness High, > 10 bar for the glass-to-
aluminium seal
Mechanical strength High, depending on dimension
even very high
Sealing material SCHOTT glass
Pins Aluminium, Copper
Lid Aluminium
Lifetime 15 years

Quality

All our production facilities are ISO 9001 certified. For more information, please refer to our quality assurance processes.








 
Trade Fairs & Events
05.
September
Trade fair CIOE - China International Optoelectronic Expo, Shenzhen, China, 05.09 - 08.09.2018
17.
September
Trade fair Gastech, Barcelona, Spain, 17.09 - 20.09.2018
25.
September
Trade fair European Microwave Week, Madrid, Spain, 25.09 - 27.09.2018
12.
November
Trade fair COMPAMED, Duesseldorf, Germany, 12.11 - 15.11.2018
Contact
SCHOTT AG
Christoph-Dorner-Strasse 29
84028 Landshut
Germany
E-Mail to SCHOTT+49 (0)871/826-0
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