Thermal protectors for LiP battery cells

14 November 2012 Circuit & System Protection

Designers are increasingly turning to high-capacity, envelope-like LiP (lithium polymer) cells to optimise space in media tablets, ultra-thin PCs, electronic readers and other small, slim consumer electronics. At the same time, battery manufacturers have been challenged to find ultra-compact over-temperature protection devices that can meet the higher currents typically found in these applications.

In response, TE Circuit Protection developed the MHP-TA series of low-profile (L: 5,8 mm x W: 3,75 mm x H: 1,15 mm) resettable thermal cut-off (TCO) devices for lithium battery protection. The devices feature a 9 V d.c. rating, two product categories with different levels of current-carrying capacity, and multiple cut-off temperature ratings.

The MHP-TA series is an extension of TE’s MHP (Metal Hybrid PPTC) technology, which connects a bimetal protector in parallel with a PPTC (polymeric positive temperature coefficient) device.

The new series comprises nine devices with two levels of current carrying capacity: low-current MHP-TA6-9 products with an approximately 6 A hold current at 25°C, and high-current MHP-TA15-9 products providing a hold current of approximately 15 A.

The low-current MHP-TA6-9 devices are available in four different temperature ratings (72°C, 77°C, 82°C, 85°C) and the high-current MHP-TA15 devices in five ratings (72°C, 77°C, 82°C, 85°C, 90°C).

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