Battery replacement method and device

Abstract

The invention discloses a battery replacement method and a device. The method comprises the following steps of: acquiring performance index of each single battery in a battery box to be measured; determining the single battery which needs replacement according to the performance index of each single battery; acquiring comprehensive performance index of other single batteries in the battery box except the single battery which needs replacement; searching a target alternative battery which matches with the comprehensive performance index in a pre-established database containing the alternative battery and the alternative battery performance index correspondence; and replacing the single battery which needs replacement with the target alternative battery. According to the battery replacement method disclosed by the embodiment, the replacement problem of a single pack and pack battery in a battery box is solved well, the whole battery box needn't to be replaced, the service life of an entire battery pack is raised, and operation cost of a battery pack is reduced.

Description

technical field [0001] The invention relates to the field of battery testing, in particular to a battery replacement method and device. Background technique [0002] At present, due to the production process and other reasons, the capacity and performance of the single cells are different. In the practical application of the series battery pack, the decay rate of the individual single cells will be significantly faster than that of other battery cells, thus affecting the single cell. The performance of the battery box where the battery is located. The BMS equalization function of the existing battery management system of the battery pack is not perfect, and it cannot fundamentally solve the difference between the single-pack cells inside the battery pack. exist and will continue to expand. Moreover, the existing solution is to simply replace the backward single battery that does not meet the requirements with a new battery. Although this method is relatively simple in oper...

AI Technical Summary

Problems solved by technology

[0002] At present, due to the production process and other reasons of the single battery, the capacity and performance of each battery are different. In the actual application of the series battery pack, the decay rate of the individual single battery will be significantly faster than that of other battery cells, thus affecting the single battery. The performance of the battery box in which the battery is located

The BMS equalization function of the battery management system of the existing battery pack is not perfect, and it cannot fundamentally solve the difference of single-pack batteries inside the battery pack, but can only prolong the time for the difference of single-pack batteries. In the end, the difference between single-pack batteries is still exist and will continue to expand

Moreover, the existing solution is simply to replace the outdated single batteries that do not meet the requirements with new batteries. Although this method is relatively simple in operation, the consequences it brings are more serious; because simply replacing the outdated cells with new batteries Batteries, in most cases, there is a big difference in performance and capacity between other battery cells in the battery box and the new battery cells. Once a series system is formed with the new battery cells, the other cells will inevitably accelerate The attenuation of the battery forms a greater imbalance and vicious circle

Images