The wound lead-acid battery has a spiral structure. It uses a plate of only about 1mm and is wound by high pressure. Since the grid material used is pure lead or lead-tin alloy, it is relatively soft and is favorable for winding. The electrolyte is a solid acid, and the electrode plate is bundled with the solid acid and rolled up to make a unique spiral winding. Because it uses a solid acid, it avoids the problem of freezing the electrolyte, and has excellent low temperature performance, which can work normally at -55 ° C low temperature conditions.
The working principle of the wound lead-acid battery is the same as that of the traditional lead-acid battery. It is only an improvement in the manufacturing process, and it is these improvements that make it have better characteristics than the traditional battery, mainly in the following several aspects:
(1) Excellent high and low temperature performance
The wound lead-acid battery can operate from -55 ° C to 75 ° C. Since the coiled lead-acid battery adopts the spiral winding technology, the gap between the plate and the plate is extremely small, and the acid is solid acid, and can be adsorbed by the glass fiber mesh, and the whole structure is extremely tight. Therefore, at high temperatures, there is substantially no bubbling phenomenon, and at low temperatures, no liquid acid can be frozen, and there is no problem of reduced current output. According to the US SAE test standard, the coiled lead-acid battery can be safely and quickly started and pulled in the range of -55 ° C to 75 ° C, while the applicable temperature range of the ordinary battery is generally only -10 ° C to 40 ° C. This is also the fundamental reason why it can solve the above-mentioned low temperature conditions of the automatic water measuring and reporting system.
(2) Charging is very fast
The wound lead-acid battery can be charged with more than 95% of electricity in 40 minutes. Since the internal resistance of the wound lead-acid battery is extremely low, the charging current can be substantially fully accepted, and its own capacity is large, so there is no current limitation during charging, and the general fast charging time can be fully loaded in about 1 hour. The internal resistance of the ordinary battery is higher, so part of the charging current will be converted into heat energy, and the charging time is generally at least 6 hours. The wound lead-acid battery is made of high-purity lead, so its side reaction is much smaller than that of an ordinary battery, so the battery can be charged with a small current, and the charging efficiency can be more than 90% even in rainy days.
(3) Long life
The packaged lead-acid battery can be designed for a float life of more than 8 years. Since the lead-acid battery has a very large active lead area, its recovery ability after discharge is also extremely strong. According to the US SAE standard, in the J240 test, the number of times of the wound lead-acid battery is as high as 15,000 times. Compared with ordinary batteries, the number of power and starting times is about 2000-4000 times, and the wound lead-acid battery has a stronger advantage.
(4) Small self-discharge electrode
Since the internal resistance of the wound lead-acid battery is extremely small, the self-discharging electrode itself is small when it is not in use. The wound lead-acid battery can be placed for two years without charging, so in a sense, it is truly maintenance-free. Ordinary batteries must be charged for up to 1-2 months.
Due to the above excellent performance, the wound lead-acid battery has been widely used in various fields such as hybrid electric vehicles, power tools, instrumentation, and wind power generation.