Impedance measurement system and method for secondary batteries

A technology of impedance measurement and secondary battery, which is applied in the direction of measuring electrical variables, measuring resistance/reactance/impedance, and measuring electricity, etc. It can solve the problem of inability to measure polarization impedance, low accuracy of measurement results, and inability to measure the entire impedance of the battery And other issues

Inactive Publication Date: 2014-06-25
TSINGHUA UNIV +1
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  • Abstract
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  • Application Information

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Problems solved by technology

[0008] The direct current method can be used for fast measurement, which can be measured under the charging and discharging operation of the battery, but the disadvantage is that 1) only the total impedance of the battery can be measured, and the charge transfer impedance and concentration polarization impedance cannot be measured; 2) the battery is assumed to be in two The polarization impedance is equal when charging and discharging at different currents, so the measurement results are not accurate and can only be used for rough estimation
The pulse method overcomes the defects of the DC method 2). In a small square wave change cycle, the ohmic internal resistance of...

Method used

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  • Impedance measurement system and method for secondary batteries
  • Impedance measurement system and method for secondary batteries
  • Impedance measurement system and method for secondary batteries

Examples

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Embodiment 1

[0039] Embodiment 1 AC impedance testing method of a secondary battery during charging operation,

[0040] Such as figure 1 As shown, this embodiment includes a battery module 1 , a charging and discharging module 2 , an AC frequency scanning module 3 and a signal collection and processing module 4 . The 203c point of the 203 three-position switch in the charging module 2 is connected to the negative pole of the battery module 1, and the 201 stable power supply, 202 electronic load and the positive pole of the battery module 1 are connected through the 203b point to form a complete DC charging circuit; the AC frequency sweep module The switch 302 included in 3 is closed, so that the battery module 1, the AC frequency scanner 301 and the switch 302 form an AC test loop. The signal collection and processing module 4 controls the 201 stable power supply and the 202 electronic load, so that the battery module 1 operates under the specified stable DC constant current charging, and...

Embodiment 4

[0042] Example 2 AC Impedance Testing Method of Secondary Battery During Discharge Operation

[0043] Such as figure 1 As shown, this embodiment includes a battery module 1 , a charging and discharging module 2 , an AC frequency scanning module 3 and a signal collection and processing module 4 . The 203c point of the 203 three-position switch in the charging module 2 is connected to the negative pole of the battery module 1, and the 203a point of the 203 three-position switch connects the negative pole of the battery module 1 to the 202 electronic load and the positive pole of the battery module 1 to form a complete DC discharge circuit The switch 302 contained in the AC frequency sweeping module 3 is closed, so that the battery module 1, the AC frequency sweeper 301 and the switch 302 form an AC test loop. The signal collection and processing module 4 controls the 202 electronic load so that the battery module 1 operates under the prescribed stable DC constant current chargi...

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Abstract

The invention discloses an impedance measurement system and method for secondary batteries and belongs to a battery measurement technology. The system comprises a battery module, a charging and discharging module, an alternating current frequency scanning module and a signal collecting and processing module. A 203c point of a 203 three-position switch of the charging and discharging circuit is connected with the negative electrode of the battery module 1, and by selecting a switch arm connected with the 203c point, the negative electrode of the battery module 1 is connected with a 202 electronic load and the positive electrode of the battery module 1 through a 203a point to form a discharging circuit. The impedance measurement system and method for the secondary batteries are applied to tests on impedance of the secondary batteries in the working state and can be used for measuring all the single secondary batteries contained in a secondary battery pack in parallel through multiple channels. The Ohm internal resistance, the electrochemical polarization impedance and the concentration polarization impedance of each secondary battery are tested out, the impedance of each secondary battery is analyzed, and the impedance measurement system and method are used for analyzing the charging and discharging performance of the batteries. The service life of the batteries is estimated, and the batteries can run more safely, stably and reliably.

Description

technical field [0001] The invention belongs to the technical scope of battery measurement, and in particular relates to an impedance measurement system and an impedance measurement method of a secondary battery. Background technique [0002] Secondary batteries, chemical power sources that can be charged and discharged, such as lithium-ion batteries, lead-acid batteries, nickel-metal hydride batteries, etc., due to the different voltage platforms and energy densities of various batteries, are used in electric vehicles, power , energy storage, mobile phones, notebook computers, etc. are more and more widely used. The impedance of the secondary battery is an important parameter of the battery, which can be used for battery charge and discharge performance analysis, battery pack consistency analysis, remaining capacity estimation, battery operating life estimation, battery pack consistency analysis and safety performance analysis, etc. . Therefore, it is of great significanc...

Claims

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Application Information

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IPC IPC(8): G01R31/36G01R27/02
Inventor 谢晓峰顾敖大潘建欣丁晓莉王树博
Owner TSINGHUA UNIV
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