Method and system for measuring and calculating internal core temperature of battery on line based on charging and discharging data

Abstract

The invention discloses a method and system for measuring and calculating the internal core temperature of a battery on line based on charging and discharging data. The method comprises the following steps: acquiring a plurality of detection items used for determining the core temperature of a to-be-detected battery, and acquiring a first measurement value corresponding to the detection item obtained by detecting the to-be-detected battery at the current sampling moment and a second measurement value corresponding to the detection item obtained by detecting the to-be-detected battery at the previous sampling moment; and acquiring a linear neural network model for measuring and calculating the core temperature of the to-be-detected battery, and inputting the detection item, the first measurement value and the second measurement value into the linear neural network model, so that the linear neural network model measures and calculates the target core temperature of the to-be-detected battery at the current sampling moment. According to the invention, the neural network model is constructed based on the linear relationship between the detection items and the core temperature, and the weight corresponding to each detection item is directly determined through the model, so that the core temperature of the battery can be rapidly measured and calculated, and the accuracy of the measured and calculated core temperature is ensured.

Description

Technical field [0001] The present application relates to the field of battery temperature detection, and more particularly to a method and system for the core temperature of the battery based on charge and discharge data online. Background technique [0002] At present, in the production and testing process of secondary batteries such as lithium batteries, such as in the chemical formation, operation, operation, maintenance, recycling test process, need to make multiple charge and discharge testing for each battery Take the charge and discharge data. [0003] For example, in the general production test, the lithium battery cell needs to be chemically formed and the components, and the chemical processes need to be operated by a variety of combinations for long-term charging and discharging step operation, sufficient electrochemical reactions and battery activation, and the separation process At least 1.5 charge circulation, filled the battery charge state to 100%, and discharged...

AI Technical Summary

Problems solved by technology

[0003] For example, in the general production test process, lithium batteries need to go through the process of formation and capacity separation. At least 1.5 charge and discharge cycles, the battery charge state is fully charged to 100%, and discharged to the cut-off voltage. Test the battery electrode and surface temperature. Since the battery production process is a winding process, there is a difference in heat conduction between the internal core temperature of the battery and the surface temperature. Most of the causes of battery spontaneous combustion and self-explosion come from the core temperature of the battery.

[0004] Therefore, in the process of realizing the present invention, the inventors found that lithium battery packs require charging and discharging electrochemical reactions in the process of production, operation and maintenance, and recycling, and spontaneous combustion and self-explosion of lithium battery packs are prone to occur. When out of control, it may cause property damage and loss of life. However, the existing technology only detects the battery electrode and battery surface temperature, and cannot detect the battery core temperature, so it cannot guarantee whether the battery is currently in a safe state.

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