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Lithium ion battery cycle life detection device and lithium ion battery cycle life assessment method

A lithium-ion battery, cycle life technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problems of low accuracy of test results and complex evaluation methods, and achieve simple process, simple evaluation method and adaptability. strong effect

Pending Publication Date: 2018-03-02
ETRUST POWER ETP GRP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Purpose of the invention: In response to the above problems, the purpose of the present invention is to provide a detection device and evaluation method for the cycle life of lithium-ion batteries, so as to solve the problems of low accuracy of test results and relatively complicated evaluation methods

Method used

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  • Lithium ion battery cycle life detection device and lithium ion battery cycle life assessment method
  • Lithium ion battery cycle life detection device and lithium ion battery cycle life assessment method
  • Lithium ion battery cycle life detection device and lithium ion battery cycle life assessment method

Examples

Experimental program
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Embodiment 1

[0031] see figure 1 and figure 2 , a detection device for the cycle life of a lithium-ion battery, comprising two base plates 1 and a pressure sensor 2, the two base plates 1 are arranged in parallel, the lithium-ion battery 100 to be tested is located between the two base plates 1, and the two base plates 1 are connected by fasteners A base plate 1 and the lithium-ion battery 100 to be tested are fastened and arranged; the pressure sensor 2 is installed on the side of the base plate 1 opposite to the lithium-ion battery 100 to be tested, and the output end of the pressure sensor 2 is electrically connected to the signal processor (in the figure). not shown). The pressure sensor 2 can be located on a side of one bottom plate 1 opposite to the lithium-ion battery 100 to be tested, or on two sides of the bottom plate 1 opposite to the lithium-ion battery 100 to be tested. In this embodiment, the pressure sensor 2 is located on a side of the bottom plate 1 opposite to the lith...

Embodiment 2

[0044] The difference between this embodiment and Embodiment 1 lies in the structure of the pressure sensor 2 . In this embodiment, the thickness of the elastic sensitive element 21 is 0.04mm. The resistance value of the wire strain gauge is 200MΩ. The diameter of the wire strain gauge is 0.035mm.

[0045] In this example, taking a square lithium-ion battery to be tested as an example, the charge-discharge cycle performance test is carried out. The cycle test condition is 25°C and 1C / 1C rate for cycle charge-discharge experiments, and the charge-discharge mode is constant current constant voltage charge-hold-constant Current discharge, the charge cut-off voltage is 4.2V, the discharge cut-off voltage is 2.8V, and the rest time is 10min. The test equipment used is the constant wing charge and discharge test cabinet. The number of cycles is 1500 times. The relationship between the voltage of the pressure sensor obtained in this embodiment and the capacity decay rate of the li...

Embodiment 3

[0050] The difference between this embodiment and Embodiment 1 lies in the structure of the pressure sensor 2 . In this embodiment, the thickness of the elastic sensitive element 21 is 0.05mm. The resistance value of the wire strain gauge is 200MΩ. The diameter of the wire strain gauge is 0.05mm.

[0051] In this example, taking a square lithium-ion battery to be tested as an example, the charge-discharge cycle performance test is carried out. The cycle test condition is 25°C and 1C / 1C rate for cycle charge-discharge experiments, and the charge-discharge mode is constant current constant voltage charge-hold-constant Current discharge, the charge cut-off voltage is 4.2V, the discharge cut-off voltage is 2.8V, and the rest time is 10min. The test equipment used is the constant wing charge and discharge test cabinet. The number of cycles is 2500 times. The relationship between the voltage of the pressure sensor obtained in this embodiment and the capacity decay rate of the lit...

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Abstract

The present invention provides a lithium ion battery cycle life detection device and a lithium ion battery cycle life assessment method. The lithium ion battery cycle life detection device comprises two bottom plates and pressure sensors, the two bottom plates are arranged parallelly, and a to-be-detected lithium ion battery is located between the two bottom plates. The pressure sensors are respectively installed on the opposite side surfaces of the bottom plates and the to-be-detected lithium ion battery, and the output ends of the pressure sensors are connected with a signal processor electrically. According to the above lithium ion battery cycle life detection device, the pressure sensors are arranged on the bottom plates, when the charge and discharge cycle tests are carried out on thelithium ion battery, the lithium ion battery expands in the thickness direction, the pressure sensors can reflect the pressure change caused by the lithium ion battery thickness change to the signalprocessor timely, and by a relation schema of the cycle number of times and the capacity attenuation rate and the pressure change, the cycle life of the lithium ion battery can be assessed. The abovedetection results are more accurate, and the assessment method is simpler and is stronger in adaptability.

Description

technical field [0001] The invention relates to the field of detection devices for lithium-ion batteries, in particular to a detection device and an evaluation method for the cycle life of lithium-ion batteries. Background technique [0002] With the continuous development of the economy, the demand for energy is further increased, so the voice of new energy is getting higher and higher. As a green high-energy rechargeable battery, lithium-ion batteries are widely used in electronic communications, transportation and aviation because of their high capacity, high safety, and long cycle life. [0003] In the production process of lithium-ion batteries, it is necessary to test the cycle life of lithium-ion batteries to eliminate unqualified products. The current evaluation methods for the cycle life of lithium-ion batteries are relatively complicated, and do not take into account the life of lithium-ion batteries during use. The impact of expansion on the cycle life, the accur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/3865G01R31/392
Inventor 陈道明刘灿柳听前
Owner ETRUST POWER ETP GRP LTD
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