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ISOMAP-based lithium battery (LIB) thermal-technology space-time modeling method

A modeling method, lithium battery technology, applied in calculation models, electrical digital data processing, biological neural network models, etc., can solve problems such as difficult temperature distribution

Inactive Publication Date: 2018-10-26
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Estimating the temperature distribution online is very difficult because few sensors can be placed in the vehicle battery system

Method used

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  • ISOMAP-based lithium battery (LIB) thermal-technology space-time modeling method
  • ISOMAP-based lithium battery (LIB) thermal-technology space-time modeling method
  • ISOMAP-based lithium battery (LIB) thermal-technology space-time modeling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] The ISOMAP-based spatio-temporal modeling method of lithium battery thermal process in this embodiment: Step 1, such as figure 1 , figure 2 As shown, a lithium battery charge and discharge control platform is built, and a plurality of temperature sensors 2 are uniformly arranged on the surface of the lithium battery 1, and the data acquisition device 3 transmits the temperature data collected by each temperature sensor 2 to the host computer 4, the The lithium battery 1 is electrically connected to the battery test cabinet 5, and the battery test cabinet 5 provides an input signal to the lithium battery 1, so that the lithium battery 1 is charged and discharged in a cycle; step 2, the host computer 4 counts the temperature data of all temperature sensors 2, Obtain the spatio-temporal data of the temperature distribution of the lithium battery 1 changing with time under the condition of cyclic charging and discharging, and define the spatio-temporal data as:

[0093]{T...

Embodiment 2

[0186] This example validates the proposed modeling method by conducting real-time experiments. The lithium battery 1 used is a 60Ah lithium iron phosphate battery purchased from a battery manufacturer in Shenzhen, China. This battery uses lithium iron phosphate as its positive electrode material, and has been successfully put into use in electric vehicles. Its basic parameters are shown in Table 1. Considering a flat prismatic 60Ah LiFePO 4 / graphite battery, a 2D thermal model is considered because the temperature variation along the thickness of the battery cell is negligible.

[0187] parameter name

parameter value

Nominal capacity / (Ah)

60

Nominal voltage / (V)

3.2

Battery size / (mm)

13*70*150

Charging cut-off voltage / (V)

3.65

Discharge cut-off voltage / (V)

2

Working temperature / (℃)

-20 to 55

Storage temperature / (℃)

-40 to 60

[0188] Table 1

[0189] The 60Ah lithium iron phosphate bat...

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Abstract

The invention discloses an ISOMAP-based lithium battery (LIB) thermal-technology space-time modeling method. The method comprises: step 1, constructing a lithium battery recharging-discharging controlplatform; step 2, obtaining time-space data of temperature distribution which is of a lithium battery under a cyclic recharging-discharging condition and changes with time; and step 3, using an ISOMAP algorithm by a host computer to learn an orthogonal mapping function, which characterizes space nonlinear-features, on the time-space data collected in the step 2. An ISOMAP method is global nonlinear technology, can use local geometry structures of high-dimensional data to reveal internal nonlinear manifold structures thereof, and preserves topology structures of the original data in low-dimensional space. From a view of inherent configurations, ISOMAP can reduce a model of nonlinear DPS more effectively than a PCA method, and model accuracy is high.

Description

technical field [0001] The invention relates to the field of lithium battery thermal process modeling, in particular to an ISOMAP-based spatiotemporal modeling method for lithium battery thermal process. Background technique [0002] Electric vehicles (EV) and hybrid electric vehicles (HEV) are considered as solutions to current energy and environmental issues due to oil consumption. As energy storage and conversion components, battery systems are crucial in electric and hybrid electric vehicle technology. However, battery technology advancements for EVs and HEVs are not only affected by materials, but also constrained by their management systems. A comprehensive and accurate battery management system (BMS) is essential to maximize battery life, efficiency and safety. [0003] Lithium-ion batteries (LIBs) are becoming increasingly popular as energy sources for electric and hybrid vehicles due to their high specific energy and high energy density. The safety, lifetime, and...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06N99/00G06N3/02
CPCG06N3/02G06F30/20
Inventor 徐康康杨海东
Owner GUANGDONG UNIV OF TECH
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