Method for simulating and testing assembling pressures on AGM (absorptive glass met) separators for start-stop batteries

Abstract

The invention discloses a method for simulating and testing assembling pressures on AGM (absorptive glass met) separators for start-stop batteries. The method includes steps of (1), stacking a plurality of separators together, then clamping the separators by fixtures and applying pre-tightening force on the separators; (2), intermittently adding electrolyte into the separators until the separators are in electrolyte absorption saturation; (3), adding electrolyte into the saturated separators again, then testing separator clamping pressures of the fixtures. The separator clamping pressures of the fixtures are the assembling pressures on the AGM separators for the start-stop batteries. The method has the advantages that states of separators which are actually assembled in the batteries are simulated, pressure values can be accurately and efficiently tested after the electrolyte is added into the separators made of different materials and the separators are in saturation, the assembling pressures on the separators which are actually assembled in the batteries can be simulated, accordingly, design personnel can design reasonable pre-tightening force and select the AGM separators with excellent performance according to test results, and the service lives of the manufactured start-stop batteries can be prolonged.

Description

technical field [0001] The invention relates to the technical field of lead-acid battery manufacturing, in particular to a simulation test method for the assembly pressure of an AGM separator for a start-stop battery. 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] AGM separator is the most widely used separator for lead-acid batteries in C...

AI Technical Summary

Problems solved by technology

[0004] This kind of plate has many advantages, but there are also some defects, such as large wet shrinkage, large average pore size, high compressibility, insufficient resilience, poor toughness, insufficient puncture resistance, easy to break and friction damage, The specific surface area is small (currently most of them are 0.8-1.4m 2 / g range), low wet strength, qualified acid absorption but poor electrolyte retention, easy delamination (limiting the height of the battery), and the smooth surface of the glass fiber is easy to move when the pressure is high, resulting in pore size changes and other defects. , in which the resilience is insufficient, the shrinkage after water absorption will cause the lead-acid battery to loosen the pole group, and the cycle discharge will decay sharply.

[0005] When the battery is assembled, the electrode group is tightly assembled, but after the electrolyte is filled, the AGM separator will shrink to a certain extent, which will reduce the electrode group pressure of the battery, and the too low electrode group pressure will shorten the cycle life of the battery. early termination

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