Method for estimating and correcting temperature field of battery pack by using virtual temperature sensor

Abstract

The invention discloses a method for estimating and correcting a temperature field of a battery pack by using a virtual temperature sensor. The method comprises the following steps of 1, acquiring thesingle battery temperature of single lithium ion batteries in a historical test, and storing the single battery temperature as a historical temperature; 2, establishing a deep neural network model, wherein input parameters are the temperature measured by a real temperature sensor, the position of the real temperature sensor and the historical temperature, and the temperature variables are storedas a preliminarily estimated temperature matrix; 3, collecting signals of current and voltage of all the single batteries, and increasing the monitoring frequency of a certain row of single batteriesby a current sensor / voltage sensor when it is monitored that the current / voltage of the certain row of single batteries exceeds a set current threshold / voltage threshold; and 4, calculating the temperature of the certain row of single batteries, specifically, correcting the temperature of the certain row in the preliminarily estimated temperature matrix by using the calculated temperature of the certain row of single batteries.

Description

technical field [0001] The invention relates to the field of vehicle power battery monitoring, and more specifically, the invention relates to a method for estimating and correcting the temperature field of a battery pack by using a virtual temperature sensor. Background technique [0002] Lithium-ion batteries have many advantages. At present, lithium-ion batteries are mostly used in electric vehicles and hybrid vehicles, and their characteristic parameters are very important for battery energy management systems and safety performance. Especially the temperature of lithium-ion batteries has an important impact on the capacity, voltage, internal resistance, charge and discharge efficiency, service life and safety of the battery. [0003] During the charging and discharging process of the battery, the accumulation of heat generated by the chemical reaction inside the battery will inevitably lead to an increase in temperature. Lead to electrolyte leakage, bubbles, smoke and ...

AI Technical Summary

Problems solved by technology

However, due to problems such as space layout or high cost, it is difficult to measure the characteristic parameters of each single battery, especially the temperature

Most of the existing measurement methods are to measure a few local points of the battery pack to represent the temperature field of the entire battery pack. Such a measurement method cannot measure the temperature of each single battery, resulting in some single batteries at low temperatures. Or high temperature state can not be found in time, which seriously affects the consistency and safety of the battery, and it is easy to cause some single cells to reach the service life first, which not only shortens the service life of the entire battery pack, but also is not conducive to the subsequent cascade utilization

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