What are the advantages and disadvantages of lithium batteries and lead-acid batteries for electric vehicles
Jul 14, 2018

Lead-acid batteries

Among them, lead-acid batteries are the largest. Lead-acid batteries are the lowest and most commonly used, and China is the world's largest producer of lead-acid batteries. It contains less contaminated components and is recyclable. The disadvantage is that the volume is small. That is to say, under the same capacity, the battery is heavy and bulky. Current lead-acid batteries are basically developed from float-type batteries. The floating battery does not adapt to fast charging and high current discharge. Although the technician has spent a lot of effort to improve the product, it can be put into practical use, but its life is still very unsatisfactory.

Colloidal batteries are a developmental classification of lead-acid batteries. The simplest method is to add a gelling agent to the sulfuric acid to make the sulfuric acid electrolyte into a colloidal state. A battery in which electro-hydraulic is colloidal is often referred to as a colloidal battery. Broadly speaking, the difference between a colloidal battery and a conventional lead-acid battery is not only that the electro-hydraulic is changed to gelatinous.

For example, a non-solidified aqueous colloid is the same colloidal battery from the electrochemical classification structure and characteristics. Another example is the attachment of polymer materials in the grid, commonly known as ceramic grids, which can also be regarded as the application characteristics of gel batteries. Recently, the laboratory has added a targeting coupling agent to the plate formulation, which greatly improved the reaction utilization rate of the active material of the plate. According to non-public data, the energy ratio of 70 wh/kg can be achieved. Industrial practice at this stage and application examples of colloidal batteries to be industrialized.

The difference between colloidal batteries and conventional lead-acid batteries is further developed from the initial understanding of electrolyte gelation to the electrochemical properties of electrolyte substrates and their application in grids and active materials. Its most important feature is: with a small industrial cost, along the 150-year-old lead-acid battery industry road to produce a better battery, its discharge curve is straight, the turning point is high, than the energy, especially the specific power Conventional lead-acid batteries are more than 20% larger, and their lifespan is generally about twice as long as conventional lead-acid batteries. The high-temperature and low-temperature characteristics are much better.

Lithium Ion Battery

The specific volume of a lithium-ion battery is better than that of a nickel-metal hydride battery. For a lead-acid battery of the same capacity, the weight of a lithium-ion battery is equivalent to a laptop computer, so that both old and weak women and women can use it. Its life can also be better than nickel-metal hydride batteries. The current mobile phone battery basically uses this battery. The internal resistance of the lithium battery is relatively large, and the use of the electric bicycle may cause the power of the vehicle to be insufficient when the battery is about to be completely discharged. The main problem of lithium-ion batteries is that the battery will explode in the state of over-charging and over-discharging. The cell phone batteries are all used in the battery, and then used with a good protection circuit to basically eliminate the problem of battery explosion. In the use of electric bicycles, it is necessary to use a series battery pack, and the protection circuit of the series battery pack is far more complicated than the protection circuit of the unit battery, and the material cost thereof is greatly increased. The cost of a good lithium battery protection circuit is currently close to the price of the battery itself. Polymer lithium batteries have lower explosive lethality than lithium-ion batteries, but there is also the possibility of explosion and combustion. This is also the same as the lithium-ion battery needs to solve the problem.






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