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A method for estimating reaction heat of thermal runaway of lithium-ion batteries

A lithium-ion battery and thermal runaway technology, which is applied in thermometers, measuring electricity, and calorimeters that use electrical/magnetic components that are directly sensitive to heat, and can solve the problem that lithium-ion batteries are less involved.

Active Publication Date: 2017-06-23
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, thermogravimetric analyzers, differential scanning calorimeters, and accelerating calorimeters are mainly used at home and abroad to estimate the reaction heat of two or more substances inside the battery, while lithium-ion batteries as a whole are rarely used as research objects. involve

Method used

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  • A method for estimating reaction heat of thermal runaway of lithium-ion batteries
  • A method for estimating reaction heat of thermal runaway of lithium-ion batteries
  • A method for estimating reaction heat of thermal runaway of lithium-ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The capacity of the lithium-ion battery to be tested in this experiment is 2600mAh, and the battery capacity is 1040mAh, which is 40% of the capacity.

[0041] In this example, the specific heat of the blank battery and the lithium-ion battery to be tested is measured by the hybrid method. First, 150ml of hot water is poured into the thermal insulation system (insulation cup), and the temperature T of the hot water is measured by the temperature collection device Water1 , And room temperature T Room temperature , Then put the battery at room temperature into the heat preservation system, let it stand for 10 minutes, and measure the water temperature T after standing. 2 , The quality of water m water , The quality of the battery m battery Can be measured by an electronic balance, by formula c water m water (T Water1 -T 2 )=c p,battery m battery (T 2 -T Room temperature ), calculate the specific heat, and take the average value by repeating 3 sets of the same experim...

Embodiment 2

[0052] Lithium-ion battery capacity experiment: uniformly select lithium-ion batteries with a capacity of 2600mAh, and by changing the battery capacity, take batteries with capacity of 520mAh, 1040mAh, 1560mAh, and 2080mAh as the reaction heat estimation object. Since the battery quality of the low-power lithium-ion battery has a small change after thermal runaway occurs, the battery quality change is ignored in the estimation, and the battery quality is 45.03g; image 3 It is the temperature change curve of different power lithium-ion batteries and blank batteries when the electric heating power is 20W.

[0053] The blank battery is the same as in Example 1. With reference to the estimation method in Example 1, the reaction heat of thermal runaway of lithium ion batteries with different battery capacities is estimated. It is calculated that the thermal runaway reaction heat of the battery with a capacity of 20%, 40%, 60% and 80% in this embodiment is 8.5KJ, 19.4KJ, 31.2KJ, and 34...

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Abstract

The invention discloses a method for estimating the thermal runaway reaction heat of a lithium-ion battery, which collects temperature data of a blank battery and a lithium-ion battery to be tested; imports the temperature data of the blank battery into data processing software, and uses calculus heat balance equation 1 for processing temperature data to obtain the heat loss rate in each time interval, and then fit the average value of the temperature in the time interval with the heat loss rate to obtain the relationship equation between the heat loss rate and temperature; the temperature data of the lithium-ion battery to be tested Import it into the data processing software, obtain the heat loss rate of the lithium-ion battery to be tested at a certain moment according to the relationship equation between the heat loss rate and temperature, and substitute the heat loss rate into the calculus heat balance equation 2 to obtain the lithium-ion battery to be tested at any stage The reaction heat of the internal substances of the ion battery, the reaction heat of all stages is added to obtain the reaction heat of thermal runaway of the lithium ion battery. The result of the method of the invention is reliable, and the danger degree of the battery can be recognized by estimating the reaction heat of the lithium ion battery in different states.

Description

Technical field [0001] The invention relates to a method for estimating the reaction heat of thermal runaway of a lithium ion battery. Background technique [0002] In recent years, lithium-ion batteries have been widely used in various electronic components due to their high working voltage, high power density and energy density, long charge and discharge life, no memory effect, and no pollution. Also brought more lithium-ion battery accidents. Fundamentally speaking, the lithium-ion battery accident is due to the excessive heat generated during the thermal runaway of the lithium-ion battery, which can ignite the surrounding combustible materials and other lithium-ion batteries, and ultimately lead to the occurrence of the accident. [0003] By estimating the thermal runaway reaction heat of lithium-ion batteries, it is possible to understand the energy of lithium-ion batteries in different states, which is extremely important for the safety of lithium-ion batteries in storage an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/36G01K17/00G01K7/02
Inventor 王志荣罗庆凯郑杨艳王昊刘婧婧
Owner NANJING TECH UNIV
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