With the development and maturity of micro-hybrid vehicle technology, automakers are actively developing cars with start-stop systems. The engine automatic start-stop technology, also known as "Auto-Stop" or "I-Stop", was first developed by Honda in the 1970s. It was not until 2006, due to increasingly stringent environmental regulations in the European Union, that it became possible to equip vehicles with start-stop systems, which have gradually become standard in the market for high-end vehicles.
The AGM automotive battery used in the start-stop system is mainly composed of a lead-acid battery. Enhancing the starter motor with an AGM battery, an SISS cylinder direct injection ignition start engine, a BSG power generation starter integrated machine, or an ISG integrated motor/generator start engine are the main types of start-stop systems. The most widely used start-stop system is the AGM battery + enhanced motor system, which is known as the idle stop system. This system mainly uses an enhanced starter motor and an AGM battery (enhanced battery) to start the engine.
Because this approach is not too different from the conventional way of starting a vehicle, the battery and starter motor need to withstand greater pressure, as well as require a large number of sensors and controllers to detect and control the system. The most important thing is to strengthen the starter motor and battery. Most start-stop systems use a combined and separated starter motor, which means that each time the starter motor gear needs to be combined with the flywheel, increasing the working pressure of the starter motor. Therefore, when starting the engine, it is necessary to wait for the engine speed to drop to zero (some start-stop systems use a constant combination type starter motor, and the engine can be started at any speed without the need to drop to zero). Therefore, the starter motor needs to enhance its durability by adopting measures such as permanent magnets, strengthened forks, increasing the number and size of brushes, and strengthening the gears to enable the starter motor to withstand high-intensity work. As a result, vehicles equipped with this type of AGM automotive battery start-stop system have starter motors that are more durable than traditional starter motors, with a service life of up to 300,000 times.
The battery must also be specially strengthened to allow for rapid charging and discharging and a high capacity to cope with the work of electrical appliances in a vehicle when the engine is turned off. Ordinary lead-acid batteries cannot discharge large currents multiple times in a short time, and their partitions cannot allow ions to pass quickly. Therefore, vehicles with start-stop functions need batteries with a larger capacity. AGM automotive battery technology (absorptive glass mat glass fiber cotton partition) and EFB technology (enhanced water injection type batteries) can significantly improve the rated capacity of batteries.
Vehicles equipped with start-stop systems primarily use lead-acid batteries with AGM ultra-fine glass fiber partitions. This kind of AGM lead-acid battery has a high acid resistance and stronger electrolyte absorption, thereby achieving smaller internal resistance and longer battery life. The most important thing is that AGM automotive batteries have good deep discharge performance, allowing for short term and frequent large current discharges.