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Method for measuring multichannel synchronous impedance of high-voltage energy storage pile based on isolation technology

A high-voltage, multi-channel technology, applied in the direction of measuring resistance/reactance/impedance, measuring device, measuring electrical variables, etc. Capacitance characteristics, chemical reactions, etc.

Pending Publication Date: 2022-01-04
江苏东华分析仪器有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Existing AC impedance test analyzers test the total impedance of the entire battery stack at a fixed frequency, or use electronic switches to test the AC impedance of each battery cell in the battery stack separately. The total impedance cannot reflect the resistance of each battery cell, Capacitance characteristics and research on the chemical reaction inside the cell, because the electronic switch is not sampled synchronously, it cannot reflect the difference in the AC impedance of the cell under the same conditions
In addition, for high-voltage battery stacks, the current technology used is to measure through electronic loads, and there is a problem of phase deviation

Method used

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  • Method for measuring multichannel synchronous impedance of high-voltage energy storage pile based on isolation technology
  • Method for measuring multichannel synchronous impedance of high-voltage energy storage pile based on isolation technology
  • Method for measuring multichannel synchronous impedance of high-voltage energy storage pile based on isolation technology

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Embodiment Construction

[0024] Such as Figure 1-2 As shown, the present invention is based on the isolation technology-based multi-channel synchronous impedance measurement method of high-voltage energy storage stacks. The method comprises the steps of:

[0025] Step 1: The AC current output module applies an AC current excitation signal to the tested high-voltage energy storage battery stack;

[0026] Step 2: One channel of the multi-channel signal acquisition module collects the AC voltage at both ends of the standard sampling resistor, and the remaining N channels simultaneously collect the AC voltage at both ends of each cell of the high-voltage battery stack under test;

[0027] Step 3: Calculate the data obtained by synchronous sampling of the multi-channel acquisition module in real time to obtain the AC impedance of each cell of the battery stack under test.

[0028] Wherein, if the AC current output module in step 1 applies an AC current excitation signal of a fixed frequency to the teste...

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Abstract

The invention provides a method for measuring multichannel synchronous impedance of a high-voltage energy storage pile based on an isolation technology. The method comprises the following steps: step 1, an alternating current output module applies an alternating current excitation signal to a tested high-voltage energy storage pile; step 2, one channel of a multi-channel isolation type signal acquisition module acquires alternating current voltage at two ends of a standard sampling resistor, and the other N channels synchronously acquire alternating current voltage at two ends of each cell of the tested high-voltage battery pile; and step 3, data obtained by synchronous sampling of the multi-channel acquisition module is calculated in real time, and the alternating current impedance of each cell of the tested battery pile is obtained. The method disclosed by the invention can be applied to synchronously measuring the alternating current impedance of each battery cell in the energy storage pile with high voltage and multiple battery cells in the same state so as to characterize the difference of the battery cells.

Description

technical field [0001] The invention belongs to the technical field of high-voltage battery stack measurement, and the battery stack includes a lithium battery stack, a fuel cell stack, an electrolytic cell group, and the like. In particular, it relates to a multi-channel synchronous impedance measurement method for high-voltage energy storage stacks based on isolation technology. Background technique [0002] Existing AC impedance test analyzers test the total impedance of the entire battery stack at a fixed frequency, or use electronic switches to test the AC impedance of each battery cell in the battery stack separately. The total impedance cannot reflect the resistance of each battery cell, Capacitance characteristics and research on the chemical reaction inside the cell, because the electronic switch is not sampled synchronously, it cannot reflect the difference in the AC impedance of the cell under the same conditions. In addition, for battery stacks with large voltag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/02
CPCG01R27/02
Inventor 刘士钢王荣龚铭崔灵云吕克妹
Owner 江苏东华分析仪器有限公司
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