Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for estimating inconsistency of lithium battery pack

A lithium battery pack, consistent technology, applied in the direction of calculation, measurement of electricity, measurement of electrical variables, etc., can solve the problems of battery inconsistency, energy storage system can not be fully charged, can not be exhausted, etc.

Pending Publication Date: 2022-07-22
JILIN UNIV
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inconsistency of the battery will lead to problems such as "not fully charged", "not fully discharged", "uneven flow between clusters" and other problems in the energy storage system

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for estimating inconsistency of lithium battery pack
  • Method for estimating inconsistency of lithium battery pack
  • Method for estimating inconsistency of lithium battery pack

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0109] In this example, the research is carried out on the Panasonic lithium-ion battery 18650B, the nominal voltage is 3.7V, and the battery rated capacity is 3400mAh. After the battery pack is fully charged by CC-CV, and after standing for one hour, the HPPC test is performed on the battery pack until the voltage drops to the cut-off voltage, and the experiment is repeated.

[0110] It includes: step 1) obtaining data such as voltage, current and temperature of the lithium battery pack through charge and discharge experiments; step 2) preprocessing the data, constructing an initial data set (corresponding to the lithium battery pack), and dividing the data into n initial subgroups data set (corresponding to each individual lithium battery); step 3) processing the initial sub-data set by the extended Kalman filter transfer learning algorithm to form a new sub-data set (updated data); step 4) learning the pair by ensemble The data set is set with different weight values, and t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to the field of lithium batteries, in particular to a lithium battery pack inconsistency estimation method, which comprises the following steps of: discretizing a continuous time model of an equivalent circuit established based on a second-order RC equivalent circuit model and a Kirchhoff's law, and establishing an equivalent circuit discrete time model; fitting parameter data of the lithium battery pack by adopting a least square method to obtain a state variable initial value of an equivalent circuit discrete time model, and updating a coefficient matrix of the equivalent circuit discrete time model by adopting extended Kalman filtering to obtain SOC estimated values of a plurality of single batteries; and calculating parameter values influencing the inconsistency of the battery pack through inductive transfer learning, and integrating the parameters influencing the inconsistency of the battery pack by adopting ensemble learning to obtain an adaptive weight value. The accuracy of the SOC estimation value can be improved to a certain extent.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a method for estimating inconsistency of lithium battery packs. Background technique [0002] With the rapid development of large-scale lithium battery energy storage systems, the management of lithium battery energy storage systems has become one of the core technologies of energy storage systems, and the problem of inconsistent estimation of lithium battery packs is a technical difficulty in lithium battery energy storage system management. . There are many factors that lead to the inconsistency of the battery pack. For example, in the production process of lithium batteries, there are many and cumbersome steps and processes. Therefore, each lithium battery in the lithium battery pack will have differences when it leaves the factory. In the process of energy storage, due to the loss of battery capacity due to the different self-discharge rates of different batteries, the batte...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01R31/388G01R31/367G01R31/396G06K9/62
CPCG01R31/388G01R31/367G01R31/396G06F18/243G06F18/214
Inventor 李刚刘晗曹馨予孙彩棠周逢道韩滔
Owner JILIN UNIV