Method for fast detecting cycle life of lead-acid accumulator

Abstract

The invention discloses a method of fast detecting the cycle life of a lead-acid accumulator, which comprises the following steps of detecting real release capacity at first; then determining charge and discharge voltage of partial charge state of the accumulator; determining the charge voltage of the partial charge state; determining the discharge voltage of partial charge state so as to ensure that the accumulator circularly works at the charge and discharge voltage U1 and U2, is charged to U1 / each accumulator at the limited current of 0.2 to 2C, and is discharged to U2 / each accumulator as one cycle at the 2 to 4C-time large current; detecting the capacity after a plurality of times of cycle; comparing the measured discharge capacity with the actual capacity; and judging that the accumulator fails if the measured capacity is lower than 80% of the actual capacity. The invention has the advantages of actually reflecting the failure mode of the lead-acid accumulator for a power-driven automobile during operation, obviously shortening the detection time, and greatly saving the cost and energy sources.

Description

technical field [0001] The invention relates to the field of preparation of valve-regulated lead-acid batteries, in particular to a method for quickly detecting the cycle life of supercapacitor batteries and lead-acid batteries for electric vehicles. Background technique [0002] Cycle life, the unit is the number of times, it is an important indicator of the battery. [0003] Conventional life testing tests take too long, at least 4-5 months, and long-life battery tests take 6-12 months. There have been some rapid life test methods in the industry, and it has been confirmed by many enterprises that these rapid life test methods cannot reflect the real life of the battery, that is, they cannot truly reflect the failure mode of the lead-acid battery. The reasons are: the discharge current is too large, which deviates too much from the actual use value; the charging current is too large, and the water loss is large; due to the large charging and discharging current, the failu...

AI Technical Summary

Problems solved by technology

During operation, the negative plate accumulates to form non-renewable sulfates, which significantly reduces the effective surface area of ​​the negative plate, making it unable to provide the energy necessary to start the engine and accelerate, and to recover braking energy

The existing life test methods cannot truly reflect the failure mode of the battery during the operation of the vehicle. It is an important subject to be researched and explored by the battery industry to seek a fast and true test method for the failure mode of the battery.