Storage battery agm separator and preparation method thereof, storage battery

Abstract

The invention discloses a battery AGM separator and a preparation method thereof. The battery AGM separator includes high-alkali glass wool, medium-alkali glass fiber, two-component polyester fiber, and glue containing SiO2 particles. The high-alkali glass wool , Medium-alkali glass fiber, two-component polyester fiber, and glue containing SiO2 particles have a weight percentage of 81~87:2.8~4.6:1.8~3.7:8.3~11.4. Compared with the existing technology, the AGM separator has the following advantages: large specific surface area, small pore size, high porosity, high strength, high acid absorption, strong electrolyte retention, large resilience, small resistance, and small wetting shrinkage , The battery is pressurized and assembled with less fiber displacement, and the pore size, porosity and shape change in the battery are small. At the same time, it also provides a method for preparing battery AGM separators with simple process, easy-to-control conditions and secondary molding, and the AGM separators are used in batteries and AGM separators, which can be recycled and reused without pollution.

Description

technical field [0001] The invention belongs to the field of accumulators, and in particular relates to an AGM separator for an accumulator, a preparation method thereof, and an accumulator. Background technique [0002] In my country's rapidly developing electric vehicle industry, although lead-acid batteries are mature in technology, safe and environmentally friendly, due to their short driving range, poor high-rate discharge performance, and short cycle life, it is difficult to compete with lithium power batteries, nickel metal hydride, and fuel batteries. Winning in the competition of secondary batteries such as batteries. One of the important reasons is that the separator factor limits the specific energy, high rate discharge performance and cycle performance of lead-acid batteries. Separator performance is a determining factor affecting battery performance. [0003] There are roughly six types of separators currently used for lead-acid batteries: 1. Microporous rubber...

AI Technical Summary

Problems solved by technology

[0003] There are roughly six types of separators currently used for lead-acid batteries: 1. Microporous rubber separators: low porosity, thick substrate, slow electrolyte impregnation speed, the use of natural rubber raw materials limits its wide use, and the manufacturing process is complex, Long cycle, not suitable for lean liquid maintenance-free batteries

2. Polyvinyl chloride (PVC) separators can be divided into two types: sintering method and solvent method according to the manufacturing method: PVC sintering method separators, the pore size is too large and the PVC particles contained in them are under the conditions of thermal deformation, stress and oxidation, etc. Displacement, deformation, etc. will occur, which provides a greater possibility for the separator to seep and short circuit; while the solvent-based PVC separator is only used for gel batteries, most of which rely on imports, high cost, uncertain delivery time, and brittle and easy to break. lead to further cost increases

3. Polypropylene (PP) separator: Among the commonly used separators, PP separators have the largest pore size, low porosity (generally <80%), thin spots (uneven thickness) defects, and are prone to heat and stress. Aging and PP fiber displacement occur under the same conditions, forming a larger pore size, which is easy to form a permeable short circuit; in addition, the weak anti-oxidation ability shortens the life of the positive plate

4. Polyethylene (PE) separator: Although the pore size of the PE separator is small, the problem is that the substrate is thin, and under high temperature, oxidation and other conditions, the mechanical properties of the separator will be reduced, and defects such as cracks, pits, and large pores will appear. Lead dendrite penetration offers opportunities and is more expensive

5. Glass fiber composite partition: The glass fiber composite partition is made of different materials bonded together. Although the problem of puncture resistance strength is solved, the porosity is low (<89%) due to sizing, and the acid absorption is low and the resistance value is low. Large and corner waste cannot be recycled and reused, causing secondary pollution and many other defects

6. AGM separator: AGM separator is the most widely used separator for lead-acid batteries in China. It has many advantages, but there are also some defects, such as large wetting shrinkage, large average pore size, large compressibility, Insufficient resilience, poor toughness, insufficient puncture strength, easy to break and frictional damage, small specific surface area (currently most in the range of 0.8~1.4m2 / g), low wet strength, qualified acid absorption but Poor electrolyte retention and easy stratification (restricting the height of the battery), and defects such as pore size changes due to the smooth surface of the glass fiber that is easy to move when the pressure is high, can cause lead-acid batteries to loose the pole group and rapidly attenuate the cycle discharge. happen etc.

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