Micro battery

An LTCC micro battery consists of two bonded LTCC half-shells with cavities for electrodes and electrolyte. For a successful battery production following requirements for the LTCC half-shells are necessary:

• Low thickness (<0.5 mm),
• Low content of precious metals,
• Sufficient flatness,
• Manufacturability considering the allowable heat treatment of individual components and
• SMD integration.

In the illustrated version, the lateral dimension of the battery is (10 x 10) mm² and the depth of the cavity is 100 microns. The electrode covers an area of (6 x 6) mm². The studies on the stability of different LTCC substrates in fluoride-containing electrolyte show that LTCC is very suitable for the production of micro-batteries.

 

Technical characteristics:

 

• Total size (10 x 10) mm²
• Complete thickness: (0.7 - 2) mm
• Active area (cavity): (6 x 6) mm²
• Cavity depth 50-100 microns
• Cell voltage of 3.7 V (Li-Ion)
• Capacity: 1.5 - 2.2 mAh/cm
• Bonding of the half shells by gluing or soldering processes (metal, solder, solder glasses)

 

Services offered:

 

• Development of ceramic carriers for micro batteries
• Adaptation of housing solutions for applications in the fields of IC or MEMS packaging and energy harvesting