Simple maintenance method for fast-charging capacitive Ni-MH batteries in line operation vehicles

Abstract

The invention belongs to the field of new energy automobile storage batteries, and specifically relates to a simple maintenance method for fast charging capacity nickel-metal hydride batteries in lineoperation vehicles. The method comprises the following steps of testing the internal resistance of single batteries in turn, eliminating failed batteries with the internal resistance higher than 200%of the average internal resistance of this type of new batteries; replenishing water to single capacitor batteries in turn taking a battery box as an operation unit, determining replenishing volume according to the internal resistance, sealing; replacing the eliminated failed batteries with standby capacitive nickel-metal hydride batteries matched with the internal resistance of the whole vehicle. The method introduces an internal resistance index to replace the traditional voltage index, so that abnormal batteries or failed batteries are easier to be judged; the cost is low, and the method can directly determine the water replenishment volume for the fast-charging nickel-metal hydride batteries according to the internal resistance, compared with sealed batteries needed for conventional weighing and water replenishment, and the operation saves time and labor; the maintenance effect is obvious. The internal resistance of the capacitive nickel-metal hydride batteries treated by the method provided by the invention is reduced by 10%-60% compared with that before the treatment; the capacity value is increased by 5%-30%.

Description

technical field [0001] The invention belongs to the field of storage batteries for new energy vehicles, and in particular relates to a simple maintenance method for fast-charging capacity-type nickel-hydrogen batteries in line operation vehicles. Background technique [0002] In the practical application of power batteries, it is often necessary to use multiple batteries in series to meet the required voltage requirements. However, due to the poor control of battery grouping technology and battery consistency, as the number of battery charge and discharge cycles increases, The difference between the batteries will become larger and larger, affecting the service life of the battery pack. The failure of secondary batteries, such as chromium-nickel batteries, nickel-metal hydride batteries, lithium-ion batteries, capacitor batteries, etc., is the result of the comprehensive action of multiple factors, which are related to materials, manufacturing processes, working environment ...

AI Technical Summary

Problems solved by technology

[0003] There are generally two ways to maintain the existing sealed power battery: one is to remove the abnormal battery first, and then find the original liquid injection record and weigh the abnormal battery, and refill and charge the abnormal battery; this traditional maintenance method There are disadvantages such as cumbersome process, unpacking and weighing before rehydration, high labor intensity, long time consumption, and low maintenance efficiency; another online equalization method for sampling does not need unpacking and rehydration, and is easy to operate and high in efficiency , but this method requires professional equipment, and the cost of equipment is high, and the equalization effect using voltage as the equalization reference is poor without rehydration

[0004] In addition, the above two maintenance methods generally use voltage means. Batteries with a voltage lower than the average voltage are charged, and batteries with a voltage higher than the average voltage are discharged. However, the reliability of voltage as an indicator of battery deterioration is poor, especially in the case of lack of liquid. This is especially true in the current environment. Sometimes the voltage value of a slightly deteriorated battery is normal and maintenance is missed, which in turn affects the service life of the battery.