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Estimation method of lithium ion battery thermal runaway reaction heat

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

Active Publication Date: 2015-05-13
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Estimation method of lithium ion battery thermal runaway reaction heat
  • Estimation method of lithium ion battery thermal runaway reaction heat
  • Estimation method of lithium ion battery thermal runaway reaction heat

Examples

Experimental program
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Effect test

Embodiment 1

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

[0041] The specific heat of the blank battery of this embodiment and the lithium-ion battery to be tested is measured by the mixing method. First, 150ml of hot water is poured into the heat preservation system (insulation cup), and the temperature T of the hot water is measured by the temperature acquisition device. 水1 , and indoor temperature T 室温 , and 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 mass of water m 水 , the mass of the battery m battery Can be measured by electronic balance, through the formula c 水 m 水 (T 水1 -T 2 ) = c p,battery m battery (T 2 -T 室温 ), calculate the specific heat, and get the average value by repeating 3 groups of identical experiments.

[0042] refer to figure 1 The...

Embodiment 2

[0052] Lithium-ion battery power experiment: A lithium-ion battery with a capacity of 2600mAh is uniformly selected. By changing the battery power, batteries with a power of 520mAh, 1040mAh, 1560mAh, and 2080mAh are used as the object of reaction heat estimation. Since the battery mass change is small after the thermal runaway of the lithium-ion battery with low power, the battery mass change is negligible when estimating, and the battery mass is 45.03g; image 3 It is the temperature change curve of lithium-ion batteries with different capacities and blank batteries when the electric heating power is 20W.

[0053] The blank battery is the same as in Example 1, and 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. Through calculation, the thermal runaway reaction heats of the batteries with capacities of 20%, 40%, 60% and 80% in this embodiment are 8.5KJ, 19.4KJ, 3...

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Abstract

The invention discloses an estimation method of lithium ion battery thermal runaway reaction heat; the method comprises the following steps: collecting temperature data of a blank battery and a tested lithium ion battery; importing the temperature data of the blank battery into a data processing software, using a calculus heat balance equation 1 to process the temperature data, so as to obtain a heat loss rate in each time interval, then fitting an average value of temperature in the time interval with the heat loss rate in order to obtain a relationship equation of the heat loss rate and temperature; importing the temperature data of the tested lithium ion battery into the data processing software, calculating the heat loss rate of the tested lithium ion battery at a certain time based on the relationship equation of the heat loss rate and the temperature, substituting the heat loss rate into a calculus heat balance equation 2, so as to obtain a reaction heat of the materials inside the tested lithium ion battery in any stage, summing the reaction heat of all stages in order to obtain the lithium ion battery thermal runaway reaction heat. The disclosed method is reliable in result; the danger degree of the battery can be recognized by estimating the reaction head of the lithium ion battery under different states.

Description

technical field [0001] The invention relates to a method for estimating 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 operating voltage, high power density and energy density, long charge and discharge life, no memory effect, and no pollution. It also brought more lithium-ion battery accidents. Lithium-ion battery accidents are fundamentally due to the excessive heat generated during the thermal runaway process of lithium-ion batteries, which can ignite surrounding combustible materials and other lithium-ion batteries, eventually leading to accidents. [0003] By estimating the thermal runaway reaction heat of lithium-ion batteries, we can understand the energy of lithium-ion batteries in different states, which is of great significance to the safety of storage and transportation of lithium-ion batteries, and provides a w...

Claims

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Application Information

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