Millions of Tadiran lithium batteries are used in automotive applications, powering everything from electronic toll tags, to air-bag deployers, emergency notification (eCall) systems, GPS tracking devices, tire-pressure monitoring, and engine controllers.
Tadiran also supplies lithium metal oxide batteries to provide emergency power for Actia’s ACU‐II units installed in high‐end European automobiles. Now mandatory for all new vehicles made in Europe, the eCall device detects when a car has experienced a serious accident, then automatically contacts emergency first responders with the car’s exact location, direction of travel, and number of passengers, thus enabling emergency services teams to cut their response times and save lives. The ACU‐II can also track vehicle location and control certain aspects of vehicle operation via a smartphone app.
Tadiran batteries provide a miniaturized back-up power solution that can retain sufficient energy to power emergency communications charge for over 10 years years, while also survive extreme shock and vibration during an automotive emergency.
For example, Tadiran bobbin-type lithium thionyl chloride (LiSOCl2) batteries are chose by the major manufacturers of electronic toll tags because their wide temperature range (–55°C to 125°C) allows them to handle the severe temperature cycles that characterize car windshields, where heat soak can hit 113°C (according to SAE) when parked, cooling down rapidly to room temperature. In cold weather, of course, the battery must handle cold soak and a rapid temperature rise. The extended operating temperature results from the battery chemistry using no water and the physical stability of the battery materials. Tadiran batteries are also hermetically sealed, which is a major advantage over non-hermetically sealed batteries.
Bobbin-type LiSOCl2 technology is particularly well suited for low-current applications because of its high-energy density, high capacity, low self-discharge rate and its ability to withstand broad fluctuations in pressure, temperature, and shock.
GPS mobile asset tracking systems are high pulse applications that typically require a low continuous current (or no continuous current) coupled with high pulses of up to several amperes from a few seconds to almost 20 min. Tadiran batteries serve GPS applications by combining the extended operating life capability of bobbin-type construction for the vast majority of time that the device spends in a low-power ‘standby mode’. This standard LiSOCl2 cell is then coupled with a patented hybrid-layer capacitors (HLCs) that delivers periodic high pulses to initiate data acquisition and transmission, and for remote shut-off capabilities.
Such qualities make these cells ideal for use in tire pressure monitoring systems. For example, German car makers place Tadiran LiSOCl2 batteries inside each wheel on the rim. The batteries were chosen because they were small and lightweight, delivered long operating life, and were able to withstand extreme temperatures. In tests on a mountain pass, a fully loaded car was driven for 45 min and saw extreme braking forces during that time. Brake disc temperatures hit 900°C and caused temperatures within the tire to exceed 100°C. This was no problem for the Tadiran batteries, which had a short-term limit of 170°C. In high-speed tests on the road and on dynos, these cells withstood over 300 km/h, mechanical shock 100g half sine, and static centrifugal forces of 2,000g.