What are the advantages of lead-acid batteries and nickel-metal hydride batteries?

Lead-acid batteries have the longest application history and the most mature technology. They are the cheapest batteries with the lowest cost and have been processed in large quantities. Among them, the valve-regulated sealed lead-acid battery (VRLA) has once become an important vehicle power lithium-ion battery, which is used in the EV and HEV developed by many European and American automobile companies, such as the Saturn developed by GM in the 1980s and 1990s. And EVI electric cars, etc. However, lead-acid batteries have low specific energy, short battery life, high self-discharge rate, and low cycle life; its important raw material lead is heavy, and heavy metal environmental pollution may occur during processing and recycling. Therefore, at present, lead-acid batteries are mainly used for ignition devices when cars are started, and small equipment such as electric bicycles. Nickel Metal Hydride (Ni/MH) batteries have good resistance to overcharge and overdischarge, and there is no heavy metal pollution problem, and there will be no electrolyte increase or decrease in the working process, and can achieve a sealed design and maintenance-free. Compared with lead-acid batteries and nickel-cadmium batteries, nickel-hydrogen batteries have higher specific energy, specific power and cycle life. The disadvantage is that the battery has a poor memory effect, and with the progress of the charge and discharge cycle, the hydrogen storage alloy gradually loses its catalytic ability, and the internal pressure of the battery will gradually increase, which affects the use of the battery. In addition, the expensive price of nickel metal also leads to higher costs. In terms of key materials, nickel-metal hydride batteries are mainly composed of positive electrode, negative electrode, separator and electrolyte. The positive electrode is nickel electrode (Ni(OH)2); the negative electrode generally uses metal hydride (MH); the electrolyte is mainly liquid, and the important component is hydrogen. Potassium oxide (KOH). At present, the research focus of nickel-hydrogen battery is mainly on the positive and negative electrode materials, and its technology research and development is relatively mature. Ni-MH batteries for vehicles have been processed and used in batches, and they are the most widely used type of vehicle batteries in the development of hybrid vehicles. The most typical representative is the Toyota Prius, which is currently the largest mass-produced hybrid vehicle. PEVE, a joint venture between Toyota and Panasonic, is currently the world's largest manufacturer of nickel-metal hydride power lithium-ion batteries. Now that nickel-metal hydride batteries have withdrawn from the ranks of mainstream power lithium-ion batteries, why does Toyota stick to the nickel-metal hydride battery camp? Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please Contact Delete Previous post: What is the difference between lithium batteries and dry batteries?