The concept of batteries for electric vehicles also permeates the topic of discussion when buying a car on a daily basis. At present, there are two kinds of batteries loaded on new energy vehicles, namely lithium batteries and lead-acid batteries, which are responsible for the role of vehicle power supply and backup power supply. The lifepo4 battery technology is mature and has been used in 5G, energy storage, solar energy, automobiles, golf courses, artificial intelligence, AGV, robots, emergency power supplies, toys, etc., but it has been criticized for battery life and charging problems when used in new energy vehicles. . At the beginning of 2021, GAC released graphene batteries for electric vehicles, which caused an uproar due to its excellent energy storage and charging speed, but it has not yet been applied in the market. What hinders the application of graphene batteries, and lead-acid batteries and graphene batteries What's the difference?
In terms of battery usage, the most common lead-acid batteries are the lead-acid battery for starting the engine compartment of the car and the lead-acid battery for power at the bottom of the electric two-wheeler. They are square in shape, large and heavy. Compared with lead-acid batteries, graphene batteries are smaller in size and lighter in weight under the same power. The volume and weight of lithium batteries are one-third of that of lead-acid batteries under the same power. Restricted by technology and cost, it is currently mainly used in electric two-wheelers and mobile phones.
In terms of charging speed, the graphene battery currently on the market refers to a lithium battery mixed with graphene material, not a pure graphene battery. The arrangement structure allows electrons to pass through quickly, allowing the use of graphene batteries to have an extremely fast charging speed. As GAC advertises, electric vehicles are fully charged to 80% in 8 minutes. The activity of lead-acid batteries is lower than that of lithium batteries. At the same temperature, lithium batteries have a wider range of charging power. With the support of graphene electrodes, high-power and high-current charging can be achieved. The internal chemical reaction of lead-acid batteries Due to limitations, fast charging and high current discharge cannot be achieved, which is one of the reasons why it cannot be used as a power battery.
In terms of safety, lead-acid batteries do not require high working conditions, do not require protection circuits, and are almost maintenance-free. Therefore, they are basically lead-acid batteries in harsh environments. Common ones, such as automotive lead-acid batteries, do not require battery maintenance during their lifespan. Carry out maintenance. The graphene lithium battery is hypocritical. The main body of the graphene battery is still lithium. It also has the shortcomings of lithium batteries such as bulging and explosion. With the blessing of graphene, the battery is more likely to be overcharged and overdischarged. Therefore, graphene batteries need to be equipped with a more accurate battery management system.
In terms of cost and environmental protection, lead-acid batteries have high stability and low cost. It can be seen that lead-acid batteries are 2-3 times cheaper than electric two-wheelers equipped with graphene batteries, and lead-acid batteries pollute less components. , good recyclability. However, the cycle times of lead-acid batteries are low, generally around 350 times, while the cycle times of graphene batteries are at least 3 times that of lead-acid batteries. However, the lithium metal after scrapped graphene batteries has extremely high environmental pollution and poor recyclability.
