Thermal Analysis of Multifunctional Satellite Structure-Battery

2012 ◽  
Vol 450-451 ◽  
pp. 228-234
Author(s):  
Yang Wang ◽  
Chao Yi Peng
Keyword(s):  
Thermal Conductivity ◽  
Heat Dissipation ◽  
Lithium Ion ◽  
Thermal Control ◽  
Maximum Temperature ◽  
Satellite Structure ◽  
Working Environments ◽  
Two Parameters ◽  
Longitudinal Thermal Conductivity

To make the rapidly developing micro-satellite further smaller and lighter, based on gel polymer lithium-ion battery and high thermal conductivity carbon fiber reinforced epoxy resin composites and polymethacrylimide (PMI) foam, a kind of multifunctional satellite structure-battery (SB) is designed in the paper, and an investigation of its thermal property in certain working environments is carried out by numerical simulation approach. The role of two parameters, longitudinal thermal conductivity of carbon fibers and the heat dissipation area, play in the temperature distribution while the SB is working, is analyzed. The result shows that, enlarging the heat disspation area is an effective way to decrease the maximum temperature of SB and it also implys that by selecting the two parameters carefully, the largest temperature rising of the SB could be considerably lowered, alleviating the burden of satellite thermal control subsystem.

scholarly journals Simulation of heat dissipation model of lithium-ion battery pack

2021 ◽  
Vol 300 ◽  
pp. 01014
Author(s):  
Maode Li ◽  
Chuan He ◽  
Jinkui Zheng
Keyword(s):  
Phase Change ◽  
Temperature Rise ◽  
Heat Dissipation ◽  
Lithium Ion ◽  
Maximum Temperature ◽  
Air Cooling ◽  
Power Battery ◽  
Staggered Arrangement ◽  
Dissipation Model ◽  
Cooling Methods

Lithium-ion power battery has become an important part of power battery. According to the performance and characteristics of lithiumion power battery, the influence of current common charge and discharge and different cooling methods on battery performance was analysed in this paper. According to the software simulation, in the 5C charge-discharge cycle, the maximum temperature of the cells with regular arrangement is 57.97°C, the maximum temperature of the cells with staggered arrangement is 55.83°C, and the maximum temperature of phase change cooling is 47.42°C. The most important thing is that the temperature difference between the cells with phase change cooling is only 5.5°C. Some simulation results of air cooling and phase change show that phase change cooling can control the heat dissipation and temperature rise of power battery well. The research in this paper can provide better theoretical guidance for the temperature rise, heat transfer and thermal management of automotive power battery.

scholarly journals Optical and Thermal Analysis of Secondary Optics in Light Emitting Diodes’ Packaging: Analysis of MR16 Lamp

2021 ◽  
Vol 2116 (1) ◽  
pp. 012121
Author(s):  
Mohammad Azarifar ◽  
Ceren Cengiz ◽  
Mehmet Arik
Keyword(s):  
Heat Dissipation ◽  
Light Emitting Diodes ◽  
Thermal Characterization ◽  
Thermal Control ◽  
Light Extraction Efficiency ◽  
Thickness Effect ◽  
Package Design ◽  
Light Emitting

Abstract Optical and thermal control are two main factors in package design process of lighting products, specifically light emitting diodes (LEDs). This research is aimed to study the role of secondary optics in opto-thermal characterization of LED packages. Novel thin total internal reflection (TIR) multifaceted reflector (MR) lens is modelled and optimized in Monte-Carlo ray-tracing simulations for MR16 package, regarded as one of the widely used LED lighting products. With criteria of designing an optical lens with 50% reduced thickness in comparison to commercially available lenses utilized in MR16 packages, nearly same light extraction efficiency and more uniform beam angles are achieved. Optical performance of the new lens is compared with the experimental results of the MR16 lamp with conventional lens. Only 2.3% reduction in maximum light intensity is obtained while lens size reduction was more than 25%. Based on the detailed CAD design, heat transfer simulations are performed comparing the lens thickness effect on heat dissipation of MR16 lamp. It was observed that using thinner lenses can reduce the lens and chip temperature, which can result in improved light quality and lifetime of both lens and light source.

scholarly journals Experimental Analysis on the Application of Polymer Matrix Composites Containing Al2O3 for Automotive Lamp Reflector

2019 ◽  
Vol 9 (21) ◽  
pp. 4525
Author(s):  
Young Shin Kim ◽  
Jae Kyung Kim ◽  
Seung Jun Na ◽  
Euy Sik Jeon
Keyword(s):  
Thermal Conductivity ◽  
Polymer Matrix ◽  
Experimental Analysis ◽  
Heat Dissipation ◽  
Polymer Matrix Composites ◽  
Morphological Characteristics ◽  
Maximum Temperature ◽  
Matrix Composites ◽  
Polybutylene Terephthalate ◽  
Light Quantity

As automotive lamps are highly integrated, the heat generated from bulbs reduces the light quantity and lifespan of the bulbs. Numerous studies have been actively conducted worldwide on heat dissipation designs and material modifications for heat release. In this study, an analysis was carried out of the mechanical, thermal, and morphological characteristics of Polybutylene Terephthalate (PBT) and Polyamide (PA6) matrix composites containing alumina filler; further, their flowability and injection moldability were also studied. The PA6 matrix that was subjected to an addition of 60% alumina was selected as the sample. To compare the performances of the selected composites with that of the fog lamp reflector manufactured with conventional PBT, fog lamp reflectors were fabricated. When 60% alumina was added, the thermal conductivity was improved. Thus, the maximum temperature of the lamp reflector was reduced, and the heat was transferred to the surroundings; this was in contrast to the fog lamp reflector fabricated with conventional PBT.

The Role of Zinc Oxide in Compounding Government Synthetic Rubber

1943 ◽  
Vol 16 (3) ◽  
pp. 650-659
Author(s):  
R. S. Havenhill ◽  
J. J. Rankin
Keyword(s):  
Thermal Conductivity ◽  
Zinc Oxide ◽  
Heat Generation ◽  
Heat Dissipation ◽  
Synthetic Rubber ◽  
Processing Channel ◽  
Type Test ◽  
New Type ◽  
Lower Heat

Abstract A comparative analysis of some of the factors involved in road tests on tires and laboratory flexometer tests indicates that not enough attention has been paid to heat dissipation and the role of the thermal conductivity of stocks in increasing heat dissipation. Flexometer tests currently used, in which samples are flexed between insulated plates, measure mainly heat generation. A modified St. Joe flexometer test is described, using metal-faced plates, which takes into account not only heat generation but heat dissipation, and should more nearly simulate road tests on tires when comparing GR-S (Buna-S) synthetic rubber stocks having different thermal conductivities. Using the new type test, mixtures of easy-processing channel black and zinc oxide are shown to have higher tensile strength and lower heat generation than soft blacks or mixtures of soft blacks and easy-processing channel blacks. The data given in this report indicate the need of further work along this line in the way of road tests on actual GR-S (Buna-S) tires containing zinc oxide in both tread and carcass.

scholarly journals Simulation Study on Liquid Cooling of Lithium-ion Battery Pack with a Novel Pipeline Structure

2021 ◽  
Vol 2125 (1) ◽  
pp. 012062
Author(s):  
Chao Lv ◽  
Tianyuan Xia ◽  
Hongxin Yin ◽  
Minghe Sun
Keyword(s):  
Lithium Ion Battery ◽  
Flow Rate ◽  
Temperature Difference ◽  
Heat Dissipation ◽  
Lithium Ion ◽  
Battery Pack ◽  
Maximum Temperature ◽  
Coolant Temperature ◽  
Temperature Uniformity ◽  
Liquid Cooling

Abstract Lithium-ion battery is widely used as the mainstream power source of electric vehicles owing to its high specific energy and low self-discharge rate. However, the performance of the lithium-ion battery is largely hindered by its heat dissipation issue. In this paper, lithium-ion battery pack with main channel and multi-branch channel based on liquid cooling sys-tem is studied. Further, numerical simulation was used to analyze the effects of coolant temperature and flow rate on cooling performance. Based on the original pipeline structure, a new pipeline structure was proposed in the present work. The results show that increasing the cool-ant flow rate not only reduces the maximum temperature of the battery pack, but also reduces the temperature difference. Lowering the coolant temperature could largely decrease the maximum temperature of the battery pack, but it tends to widen the temperature difference and worsen the temperature uniformity. Up-on comparison, maximum temperature is found to be decreased by 0.44K, whereas, the temperature difference of the battery decreased and the temperature uniformity is improved.

Numerical Modeling of the Thermal Performance of 3D SiP with TSV

2011 ◽  
Vol 189-193 ◽  
pp. 1610-1613
Author(s):  
Kai Lin Pan ◽  
Jing Huang ◽  
Jing Liu ◽  
Wei Tao Zhu ◽  
Guo Tao Ren
Keyword(s):  
Thermal Performance ◽  
Heat Dissipation ◽  
Three Dimensional ◽  
Electrical Performance ◽  
Maximum Temperature ◽  
Dimensional System ◽  
Continuous Increase ◽  
Key Technology ◽  
Three Dimensional System

Electronic package development is driven by the continuous increase in demands for miniaturization of products with enhanced performances. Three Dimensional System in Package (3D SiP) has become a key technology to satisfy the request. The 3D SiP with Through Silicon Via (TSV) technology is developed for chip to chip stacking in a package with superior electrical performance than conventional structures. In this study, we evaluate the thermal performance of 3D SiP with TSV technology using Finite Element Method (FEM). The evaluation topics covered impacts of various materials of mold, 3D SiP models with and without TSV, and various convention conditions. The results indicated that the role of TSVs in heat dissipation is not obvious in this study, and the maximum temperature merged in the center of the chip1 under different conditions which are considered.

scholarly journals Three-Dimensional Thermal Modeling of Internal Shorting Process in a 20Ah Lithium-Ion Polymer Battery

Energies ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 1013
Author(s):  
Yubai Li ◽  
Zhifu Zhou ◽  
Wei-Tao Wu
Keyword(s):  
Thermal Conductivity ◽  
Lithium Ion Battery ◽  
Thermal Modeling ◽  
Electrical Potential ◽  
Three Dimensional ◽  
Lithium Ion ◽  
Maximum Temperature ◽  
Cold Plate ◽  
Lithium Ion Polymer Battery ◽  
Polymer Battery

To better address the safety issues of a lithium-ion battery, understanding of its internal shorting process is necessary. In this study, three-dimensional (3D) thermal modeling of a 20 Ah lithium-ion polymer battery under an internal shorting process is performed. The electrochemical thermal coupling scheme is considered, and a multi-scale modeling approach is employed. An equivalent circuit model is used for characterizing the subscale electrochemical behaviors. Then, at the cell scale, the electrical potential field and thermal field are resolved. For modeling the internal shorting process, a block of an internal short is directly planted inside the lithium-ion battery. Insights of the temperature evolutions and 3D temperature distributions are drawn from the simulations. The effects of shorting resistance, through-plane thermal conductivity, and mini-channel cold-plate cooling are investigated with the simulations. A large amount of heat generation by a small shorting resistance and highly localized temperature rise are the fundamental thermal features associated with the internal shorting process. The through-plane thermal conductivity plays an important role in the maximum temperature evolutions inside the battery cell, while the external cooling condition has a relatively weak effect. But the cold plate cooling can benefit lithium-ion battery safety by limiting the high temperature area in the internal shorting process through heat spreading.

The Effects of Material Properties on Heat Dissipation in High Power Electronics

1998 ◽  
Vol 120 (3) ◽  
pp. 280-289 ◽  
Author(s):  
T. J. Lu ◽  
A. G. Evans ◽  
J. W. Hutchinson
Keyword(s):  
Thermal Conductivity ◽  
Power Electronics ◽  
High Power ◽  
Heat Dissipation ◽  
Substrate Material ◽  
High Thermal Conductivity ◽  
Analytical Models ◽  
Wide Range ◽  
Power Densities

The role of the substrate in determining heat dissipation in high power electronics is calculated, subject to convective cooling in the small Biot number regime. Analytical models that exploit the large aspect ratio of the substrate to justify approximations are shown to predict the behavior with good accuracy over a wide range of configurations. The solutions distinguish heat spreading effects’ that enable high chip-level power densities from insulation effects that arise at large chip densities. In the former, the attributes of high thermal conductivity are apparent, especially when the substrate dimensions are optimized. Additional benefits that derive from a thin layer of a high thermal conductivity material (such as diamond) are demonstrated. In the insulating region, which arises at high overall power densities, the substrate thermal conductivity has essentially no effect on the heat dissipation. Similarly, for compact multichip module designs, with chips placed on both sides of the substrate, heat dissipation is insensitive to the choice of the substrate material, unless advanced cooling mechanisms are used to remove heat around the module perimeter.

Effect of Thermal Conductivity and Thickness of the Walls on the Natural Convection in a Horizontal Viscoelastic Jeffreys Fluid Layer

2018 ◽  
Vol 140 (12) ◽  
Author(s):  
Ildebrando Pérez-Reyes ◽  
Luis Antonio Dávalos-Orozco
Keyword(s):  
Thermal Conductivity ◽  
Natural Convection ◽  
Fluid Layer ◽  
Critical Rayleigh Number ◽  
Retardation Time ◽  
Experimental Conditions ◽  
Thermal Boundary Conditions ◽  
Two Parameters ◽  
Relative Retardation

It is a common practice to use ideal thermal boundary conditions to investigate natural convection. These correspond to very good conducting walls and to very bad conducting walls. In particular, this has been the case in natural convection of viscoelastic fluids. In this paper, these conditions are generalized by taking into account the finite thermal conductivities and thicknesses of the walls in the natural convection of a viscoelastic Jeffreys fluid heated from below. The goal is to present more realistic results related to experimental conditions. The critical Rayleigh number Rc, the frequency of oscillation ωc, and the wavenumber kc have been plotted varying the properties of the walls from the case of very good thermal conductivity to very poor thermal conductivity. In order to understand the convective phenomena, two parameters are fixed and the other one varied among the nondimensional relaxation time F, the relative retardation time E, and the Prandtl number Pr of the viscoelastic fluid. The role of the relative retardation time E on the thermal instability is discussed in detail.

scholarly journals Heat Pipe Thermal Management Based on High-Rate Discharge and Pulse Cycle Tests for Lithium-Ion Batteries

Energies ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 3143 ◽  
Author(s):  
Deng ◽  
Li ◽  
Xie ◽  
Wu ◽  
Wang ◽  
...  
Keyword(s):  
Natural Convection ◽  
Heat Pipe ◽  
Thermal Management ◽  
Heat Dissipation ◽  
Discharge Rate ◽  
Lithium Ion ◽  
High Rate ◽  
Maximum Temperature ◽  
Temperature Hysteresis ◽  
Temperature Range

A battery thermal management system (BTMS) ensures that batteries operate efficiently within a suitable temperature range and maintains the temperature uniformity across the battery. A strict requirement of the BTMS is that increases in the battery discharge rate necessitate an increased battery heat dissipation. The advantages of heat pipes (HPs) include a high thermal conductivity, flexibility, and small size, which can be utilized in BTMSs. This paper experimentally examines a BTMS using HPs in combination with an aluminum plate to increase the uniformity in the surface temperature of the battery. The examined system with high discharge rates of 50, 75, and 100 A is used to determine its effects on the system temperature. The results are compared with those for HPs without fins and in ambient conditions. At a 100 A discharge current, the increase in battery temperature using the heat pipe with fins (HPWF) method is 4.8 °C lower than for natural convection, and the maximum temperature difference between the battery surfaces is 1.7 °C and 6.0 °C. The pulse circulation experiment was designed considering that the battery operates with a pulse discharge and temperature hysteresis. The depth of discharge is also considered, and the states-of-charge (SOC) values were 0.2, 0.5, and 0.8. The results of the two heat dissipation methods are compared, and the optimal heat dissipation structure is obtained by analyzing the experimental results. The results show that when the ambient temperature is 37 °C, differences in the SOC do not affect the battery temperature. In addition, the HPWF, HP, and natural convection methods reached stable temperatures of 40.8, 44.3, and the 48.1 °C, respectively the high temperature exceeded the battery operating temperature range.

Sign in / Sign up

Export Citation Format

Share Document