Gel battery for electric vehicle

Abstract

The invention discloses a gel battery for an electric vehicle, which comprises a battery container, a battery middle cover arranged on an opening part of the battery container, a battery upper cover plate sealed on the battery middle cover, and a positive plate and a negative plate arranged in the battery container; the outer side of the positive plate is coated with a glass fiber mat clapboard with a U-shaped structure; the outer side of the negative plate is coated with a composite glass fiber clapboard with a U-shaped structure; the composite glass fiber clapboard is formed by compositing two glass fiber layers, the outer layer is an ultra-fine glass fiber substrate, and the inner layer is a glass fiber mat; and the inside of the battery container is also provided with gel electrolyte of which the gel content is 4 to 10 percent. The gel battery can effectively prevent short circuits of positive and negative poles of the battery; the glass fiber mat has good mechanical strength and elasticity, and can ensure the stability of assembly pressure; and the gel battery also has the advantages of big aperture of the fiber mat, easy pouring of gel, even distribution and the like, and has good stability and low cost.

Description

【Technical field】 [0001] The invention relates to the field of colloidal batteries, in particular to colloidal batteries for electric vehicles. 【Background technique】 [0002] Lead-acid batteries are composed of battery tanks, battery covers, paste-type positive and negative plates, dilute sulfuric acid electrolyte, separators and accessories. The manufacturing process of lead-acid batteries includes lead powder manufacturing, positive and negative grid casting, positive and negative raw plate manufacturing, plate formation and battery assembly. [0003] Lead powder manufacturing is: the 1# electrolytic lead is oxidized and screened by a special equipment lead powder machine to make lead powder that meets the requirements. The lead powder is manufactured by Shimadzu method and Barton method. The lead powder required by the battery production process, the main components of the lead powder are lead oxide and metallic lead. [0004] Positive and negative grid casting: the po...

AI Technical Summary

Problems solved by technology

However, due to the small pore size of the AGM separator and the tortuousness of the separator holes, only the colloidal content (in terms of SiO 2 Total) less than 4% of the battery, this kind of battery is called "thin gel battery", the performance can not meet the requirements of the gel battery, the gel is easy to block, the distribution is uneven, and there are "voids" inside

Oxygen generated by the positive electrode in the later stage of charging is easy to pass through the "gap" to the negative electrode to undergo oxygen recombination reaction, causing the oxygen recombination efficiency to be too high, which eventually leads to failures such as heating and deformation of the battery

Practice has proved that the colloidal content (in SiO 2 The accumulators with 4% or more can avoid this kind of failure. However, if AGM separators are used to make batteries with high colloidal content (full colloidal batteries), the colloidal electrolyte cannot be perfused evenly, and production cannot be realized.

[0009] Conventional colloidal batteries use PVC-SiO 2 Separator (or other special separator for colloid) and colloid content (in SiO 2 Total) greater than 4% made of colloidal electrolyte, PVC-SiO 2 Compared with AGM separators, separators (or other special separators for colloids) have slightly lower porosity, slightly larger internal resistance, and slightly lower high-current performance. Therefore, the gel batteries produced are large in size and high in cost, so they cannot be used in electric mopeds. Promote the use of batteries with high energy density such as lead-acid batteries

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