Lead-acid battery, also known as lead battery, is mainly composed of sponge lead negative electrode, lead dioxide positive electrode, 33% ~ 37% sulfuric acid electrolyte, plus partition, terminal, exhaust plug, connecting strip and shell and other parts. The positive and negative electrodes produced by modern industry generally take lead-calcium alloy or lead-antimony alloy as the grid, and the active substances of the positive and negative plates are PbO2 and Pb, respectively.
Due to its low price and high stability, lead-acid battery has always been the main battery type used in two-wheeled electric vehicles in China, and the penetration rate of lead-acid battery has reached 90%. Compared with lithium batteries, lead-acid batteries have the advantages of low cost, strong battery life and reliability, but their weight is also their disadvantage. The specific comparison between lead-acid battery and lithium battery is as follows:
Lead-acid batteries can be divided into four categories according to their uses: power battery, energy storage battery, backup power battery and start-up battery. Start-up battery and power battery have the largest market size, accounting for more than 70% of lead acid batteries in total.