Positive plate of lead-acid accumulator

Abstract

The invention discloses a positive plate of a lead-acid accumulator, which comprises a positive grid and is characterized in that the surface of the positive grid is coated with a carbon fiber compound substrate prepared by the mixture of carbon fiber and a corresponding matrix. The carbon fiber compound basement layer is coated with positive active materials prepared by lead ointment. A mixture comprising the components by weight of 10%-40% of carbon fiber, 10%-40% of graphite fiber, 10%-40% of anisotropic graphite, 5%-20% of carboxymethylcellulose and 10%-30% of polytetrafluoroethylene is prepared into a paste slurry to be coated on the surface of the positive grid and then is dried and cured to form the carbon fiber compound basement layer. As a carbon fiber compound substrate with high strength and high carrying capacity is coated on the positive grid, the invention enhances the structural strength of the positive plate, the dimensional stabilityand the creep resistance of the positive grid, thus greatly prolonging service life of the lead-acid accumulator.

Description

technical field [0001] The invention relates to a lead-acid accumulator positive plate. Background technique [0002] Today, when oil and other energy resources are becoming increasingly tense and air pollution is becoming more and more serious, electric bicycles, which are light, fast, pollution-free, and low-cost vehicles, have become more and more popular. Batteries are the most critical components of electric vehicles and are the energy source of electric vehicles. Currently, lead-acid batteries are widely used, accounting for more than 95% of the market share. Lead-acid batteries are recognized by consumers because of their rich resources, low price and good safety performance. [0003] However, as the power source of electric vehicles, lead-acid batteries have disadvantages such as low volume specific energy, low weight specific energy, and short service life compared with battery systems such as nickel-metal hydride batteries and lithium batteries. [0004] Accordin...

AI Technical Summary

Problems solved by technology

However, when the grid deforms and grows, the volume of the entire positive electrode will also increase, and the positive electrode will expand. When the battery is charged, PbSO4 will be converted into PbO2. In this way, the porosity will increase with the increase of the number of cycles, and the positive electrode will be severely expanded. Porosity Excessive increase, the binding force between the positive active material and the grid and the binding force between the active material particles will decrease, and the electrical contact will be destroyed

In addition, for batteries used in deep cycles, the charging time is long, the positive electrode active material is severely impacted by the oxygen evolution during charging, the density of the active material decreases, and finally softens and falls off, resulting in battery failure

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