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Method for simultaneously testing reversible heat and irreversible heat of lithium ion battery

A lithium-ion battery and battery technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problem of long test cycle and achieve the effect of improving test efficiency

Active Publication Date: 2016-01-13
深圳一特科技有限公司
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Problems solved by technology

[0003] At present, the tests for reversible and irreversible heat are carried out separately. The reversible heat production rate is mainly calculated based on the measured temperature entropy coefficient, such as formula (1); the irreversible heat production rate is calculated after the impedance of the battery is measured. Calculated according to formula (2), so the test cycle is longer

Method used

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  • Method for simultaneously testing reversible heat and irreversible heat of lithium ion battery
  • Method for simultaneously testing reversible heat and irreversible heat of lithium ion battery
  • Method for simultaneously testing reversible heat and irreversible heat of lithium ion battery

Examples

Experimental program
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Embodiment 1

[0049] (1) At a temperature of 30°C, charge and discharge the lithium-ion battery to be tested at a current of 707mA to a state of charge of 30%;

[0050] (2) Weigh the quality of the lithium-ion battery to be tested, then weld the positive and negative tabs on the lithium-ion battery to be tested, place the lithium-ion battery to be tested in the thermal chamber of the adiabatic acceleration calorimeter, and fix the thermocouple on At the center of the surface of the lithium-ion battery, connect the positive and negative terminals of the lithium-ion battery to the charge and discharge tester through wires at the same time, and record the voltage and current data of the lithium-ion battery;

[0051] (3) Run the adiabatic acceleration calorimeter, set the start temperature as T=30°C, the end temperature as T+5=35°C, the temperature step size as 0, the slope sensitivity as 0.02°C / min and the waiting time as 15min;

[0052] (4) When the temperature of the adiabatic acceleration c...

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Abstract

The invention discloses a method for simultaneously testing the reversible heat and irreversible heat of a lithium ion battery. According to the method of the invention, an adiabatic accelerating rate calorimeter and a charge and discharge tester are used in combination so as to test the reversible heat and irreversible heat of the lithium ion battery under a certain charge state, a certain temperature and a certain charge discharge current. With the method for simultaneously testing the reversible heat and irreversible heat of the lithium ion battery provided by the invention adopted, the reversible heat and irreversible heat of the lithium ion battery can be tested simultaneously, high testing efficiency can be realized.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for simultaneously testing reversible and irreversible heat generation of lithium ion batteries. Background technique [0002] During the use of lithium-ion batteries, as the charge and discharge progress, the battery will generate heat, part of which comes from the electrochemical reaction entropy change heat, and part of the heat generated by the battery resistance. The former is reversible heat, while the latter is irreversible heat. , the separate test and research on the two kinds of heat production is beneficial to the evaluation of the battery state and the optimization of the design, and is also applicable to the cause analysis of the attenuation and failure of the battery. [0003] At present, the tests for reversible and irreversible heat are carried out separately. The reversible heat production rate is mainly calculated based on the measured tem...

Claims

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Application Information

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IPC IPC(8): G01R31/36
Inventor 熊永莲严军高豪杰厉冯鹏夏基胜
Owner 深圳一特科技有限公司
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