Milwaukee—The good guys have another weapon in the battle against car thieves—an anti-theft car battery. While the idea of a battery with security features may at first seem far-fetched, without electrical power no car goes anywhere.
Johnson Controls makes the DieHard Security™ Battery for Sears. The sealed plastic security module on top of the battery consists of an electronic circuit board interfaced with a Deltrol Controls 200A multipole relay. When the battery is armed, the car won't start because the electronic module opens the relay, disconnecting the battery, and grounds the ignition, stalling the engine. When purchased, the battery is matched to a pair of key fob transmitters that arm and disarm it.
Because of the Battery Council International cold cranking requirements for the battery, the relay needs to be extremely robust—capable of handling 900A transient current at 12V dc with low contact resistance (less than 0.2 mV) for good current flow—while fitting in a compact volume and having automotive standards lifetime.
"The unique combination of patent-pending relay contactor and solenoid actuator in a compact package is the technology that makes the relay possible," says John Wittmann, Deltrol VP and engineer.
Jim Symanski, program manager at Johnson Controls Automotive Systems Group adds that, "The Deltrol relay was a key enabling technology with excellent performance and reliability in the compact size that we required."
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