Echelon utilization power battery health state monitoring method

Abstract

The invention discloses an echelon utilization power battery health state monitoring method. The method comprises the following steps of S1, testing the voltage, the capacity, the direct-current internal resistance and the week self-discharge rate of each single battery in a module, S2, calculating the capacity inconsistency among the single batteriesin the module, and calculating the capacity inconsistency of the single batteriesof different battery modules in the battery pack, and S3, respectively judging the parameter values measured in the step S1 and the inconsistency calculated in the step S2 according to a preset alarm condition, and carrying out corresponding alarm on the condition conforming to the alarm condition. Through the above mode, related parameters of each single power battery in the module and charging and discharging consistency between the module and the battery in the battery pack can be detected, and the corresponding alarm rule is set for each parameter, so that the abnormal condition of the battery is discovered in time on the basis of comprehensively and accurately monitoring the health state of the battery, and the use safety of the echelon utilization power battery is ensured.

Description

technical field [0001] The invention relates to the technical field of cascade utilization of new energy storage lithium batteries, in particular to a method for monitoring the health status of power batteries in cascade utilization. Background technique [0002] With the rapid development of the new energy vehicle industry, the number of decommissioned power batteries is also increasing. If they cannot be effectively processed and utilized, it will not only cause waste of resources, but also pose a threat to the ecological environment. In order to reuse decommissioned power batteries, the current method of cascade utilization of electric energy storage is mainly adopted. After retesting, screening and reorganizing decommissioned power batteries, they are then applied to electric energy storage equipment outside the power supply, so that in Reducing the cost of manufacturing new batteries through recycling while increasing the efficiency of battery usage. In the above casca...

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Problems solved by technology

However, the method provided by this patent only monitors the single battery, and ignores the comparison of the states of the batteries in the module or battery pack, and the parameters selected for monitoring focus on reflecting the temperature changes during the use of the power battery. It is difficult to fully and accurately reflect the health status of the battery; at the same time, the preset thresholds for each data in this patent are mainly range values, but due to the large differences in the data bases of various batteries, the unified range value cannot effectively measure the corresponding parameters Whether it is normal or not, the accuracy is low, and there are still potential safety hazards in the actual use process

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