A lithium-ion battery pack electrochemical impedance spectroscopy online measurement device

A technology of lithium-ion battery packs and lithium-ion batteries, which is applied in the direction of measuring devices, measuring electricity, and measuring electrical variables, etc., can solve problems such as difficult integration, online measurement, and long test cycle, so as to reduce additional errors and reduce data volume , the effect of reducing memory usage

Active Publication Date: 2020-12-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing AC impedance method is used to measure the electrochemical impedance spectrum of lithium-ion batteries. This measurement method requires special test equipment, the test period is long, and it is difficult to realize integration and online measurement in the system.
An online measurement device for electrochemical impedance spectroscopy of lithium-ion battery packs is now provided

Method used

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  • A lithium-ion battery pack electrochemical impedance spectroscopy online measurement device
  • A lithium-ion battery pack electrochemical impedance spectroscopy online measurement device
  • A lithium-ion battery pack electrochemical impedance spectroscopy online measurement device

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specific Embodiment approach 1

[0024] Specific implementation mode one: refer to figure 1 Specifically illustrate this embodiment, a lithium-ion battery pack electrochemical impedance spectroscopy online measurement device described in this embodiment, the device includes a processor 1, a signal generator 2, a V-I conversion circuit 3, a switch switching circuit 4 and a sampling circuit 5,

[0025] Processor 1, configured to group the sine waves of each frequency, and load the grouped sine waves of each frequency to different sections of the lowest frequency sine signal;

[0026] Signal generator 2, used to obtain voltage excitation signals of different sections after loading;

[0027] The processor 1 is also used to control switching of the switch switching circuit 4;

[0028] The switch switching circuit 4 is used to switch between different lithium-ion battery cells, so that the selected lithium-ion battery cells receive current excitation signals from different sections;

[0029] The V-I conversion c...

specific Embodiment approach 2

[0035] Specific implementation mode two: refer to figure 2 This embodiment is specifically described. This embodiment is a further description of a lithium-ion battery pack electrochemical impedance spectroscopy online measurement device described in the first embodiment. In this embodiment, the V-I conversion circuit 3 includes resistors R1-R12, Resistor Rs, diodes D1-D2, transistors Q1-Q2 and operational amplifiers U1-U3,

[0036] The voltage excitation signal output terminal of the signal generator 2 is connected to one end of the resistor R5 and one end of the resistor R6 at the same time, the other end of the resistor R5 is connected to the power ground, and the other end of the resistor R6 is connected to the inverting input terminal of the operational amplifier U1 and the resistor R9. One end and one end of the resistor R8, the non-inverting input end of the operational amplifier U1 is connected to one end of the resistor R7, and the other end of the resistor R7 is con...

specific Embodiment approach 3

[0040] Specific implementation mode three: refer to image 3 Describe this embodiment in detail. This embodiment is a further description of the online measurement device for electrochemical impedance spectroscopy of a lithium-ion battery pack described in Embodiment 1. In this embodiment, the switching circuit 4 includes n pairs of top-to-top MOS Tube,

[0041] V-I conversion circuit (3) The positive output end of the current excitation signal is connected to one end of n pair of top MOS transistors at the same time, and the negative output end of the current excitation signal of V-I conversion circuit 3 is connected to one end of other n pair of top MOS transistors at the same time, each pair A lithium-ion battery cell is connected in series between the other ends of the top MOS tubes, and n lithium-ion battery cells are connected in series.

[0042] In this embodiment, in order to realize the online measurement of the electrochemical impedance spectrum of the lithium-ion b...

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Abstract

The invention discloses an on-line measuring device for electrochemical impedance spectroscopy of a lithium ion battery pack, and relates to the field of on-line measurement of electrochemical impedance spectroscopy of the lithium ion battery pack. The device is to solve the existing problems that the electrochemical impedance spectroscopy of the lithium ion battery pack is measured by using an alternating current impedance method, a measuring method requires a dedicated testing device, the testing period is long, and the integration and on-line measurement in a system are difficult to achieve. A processor is used for grouping sine waves of each frequency, and the sine waves of each frequency after grouping are loaded into different sections of a lowest frequency sinusoidal signal; a voltage excitation signal is obtained by a signal generator; an on-off switching circuit makes a lithium ion single battery chosen through switching receive current excitation signals of different sections; a V-I conversion circuit converts voltage excitation signals into the current excitation signals; a sampling circuit obtains response voltage signals of different sections; the processor is also used for conducting fast Fourier transform on the response voltage signals to obtain the impedance spectrum spectroscopy. The device is used for measuring the impedance spectroscopy of the lithium ion battery pack.

Description

technical field [0001] The invention relates to an online measuring device for electrochemical impedance spectroscopy of a lithium-ion battery pack, belonging to the field of online measurement of electrochemical impedance spectroscopy for lithium-ion battery packs. Background technique [0002] As a new type of high-energy chemical power source, lithium-ion batteries have a series of characteristics such as high specific energy, long wet storage life, flat discharge voltage, high charge and discharge efficiency, and environmental friendliness, which makes lithium-ion batteries widely used in different applications. focus on. [0003] However, in some applications that require the system to have high safety and reliability, such as electric vehicles, satellites in orbit, emergency equipment, etc., it is necessary to monitor the core energy components to ensure the normal operation of the system. For the object of lithium-ion battery, it is difficult to monitor its health st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/389
Inventor 吕超张滔刘海洋
Owner HARBIN INST OF TECH
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