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Multi-functional high temperature structure for thermal management and prevention of explosion propagation

A heat management and heat source technology, applied in structural parts, electrical components, battery pack components, etc., can solve problems such as low service life, reliability impact, and catastrophic failure of lithium-ion battery arrays

Active Publication Date: 2018-07-31
TELEDYNE SCI & IMAGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Lithium-ion battery arrays have a lower-than-expected lifespan, are affected by reliability issues, and can fail catastrophically due to excessive heat build-up during certain charge and discharge operations

Method used

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  • Multi-functional high temperature structure for thermal management and prevention of explosion propagation
  • Multi-functional high temperature structure for thermal management and prevention of explosion propagation
  • Multi-functional high temperature structure for thermal management and prevention of explosion propagation

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0043] A cylindrical rechargeable lithium iron phosphate (LFP) battery (26650 LFP, K2 Energy) of nominal size with a diameter of 26 mm and a height of 65 mm was placed inside the hermetic enclosure. Use the through holes in the can lid to connect the electrical leads to the battery. A quantity of dielectric liquid 3M NOVEC 7200 was placed on the bottom of the enclosure. The battery was first charged to 3.65V at a rate of 0.5C, and then further charged at a constant voltage at a current that decreased to 65mA over time. The battery was then fully discharged to 0% SOC under a constant resistive load starting with a current of 10 amps. The temperature of the battery was recorded over time during discharge. The ambient temperature around the capsule was maintained at 40°C. Such as Figure 10 As shown, at 0% SOC, the temperature of the single cell wall rises by 23°C.

example 2

[0045] On the cylindrical single cell wall, a cylindrical rechargeable 26650LFP single cell (26650, K2 energy) was covered with a 250 μm thick non-woven porous structure, and the single cell was placed in an airtight enclosure. Repeat the charging and discharging process of Example 1. The temperature rise during discharge is at Figure 10 is shown in . The effect of the evaporation-condensation process in the chamber reduces the temperature rise to only 3°C.

example 3

[0047] Repeat the experiment in Example 1, except: charge at constant current (CC) at 4 amps (1.5C) until the cell voltage (at about ~3000s) reaches 3.65V, then charge at constant voltage until the current Gradually drop to 65mA. The ambient temperature is 60°C. The temperature of the single cell was recorded as a function of time during charging, and the temperature peaked at 11 °C just after the constant current step, as Figure 11 shown.

[0048] Example:

[0049] The cells were covered with a nonwoven porous structure as in Example 2 and the charging procedure of Example 3 was followed. In this example, the peak temperature rise of the single cell is ~2°C ( Figure 11 ), thus confirming the surprising effect of the cooling process provided by the addition of the porous core.

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Abstract

A system for thermal management and structural containment includes an enclosure (120), a heat source (100) disposed within the enclosure (120); and a wick (105) encompassing at least a portion of anouter surface of the heat source (100).

Description

technical field [0001] The present invention relates to phase change cooling systems, and more particularly to phase change systems using cores. Background technique [0002] Lithium-ion battery arrays have a lower-than-expected lifespan, are affected by reliability issues, and can fail catastrophically due to excessive heat build-up during certain charge and discharge operations. These concerns can be addressed by providing excess battery capacity to reduce the charge / discharge rate of any particular one of the batteries in the array. The array can also be actively cooled to reduce cell case temperatures. For example, air or a non-conductive liquid can be circulated around the array to carry excess heat away from the array. Alternatively, a phase-change material could be placed around the array to absorb excess heat. Multiple safety features are often required to provide a fail-safe system. [0003] There remains a need to provide improved thermal management and physica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/10H01M10/615H01M10/6569H01M10/6571H01M10/643H01M10/613H01M50/213
CPCH01M10/615H01M10/6569H01M10/6571H01M10/643H01M10/613Y02E60/10H01M50/213
Inventor 艾维杰特·博湖尼亚奥利维尔·苏德瑞斯蒂夫·清君·蔡
Owner TELEDYNE SCI & IMAGING
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