Method and device for analyzing internal state of lithium battery based on ultrasonic spectrum

A spectrum analysis and internal state technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve problems such as excessive ultrasonic signal devices, poor accuracy and reliability, and difficult real-time monitoring of SOC and SOH, and achieve Address imprecise estimates

Active Publication Date: 2020-06-02
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In view of the above defects or improvement needs of the prior art, the present invention provides a method and device for analyzing the internal state of lithium batteries based on ultrasonic spectrum, the purpose of which is to conduct in-depth analysis of the frequency spectrum of ultrasonic signals, and effectively solve the problem of SOC and SOH estimation of lithium batteries Inaccurate problems, and can be integrated in the battery management system to achieve real-time measurement of the internal state of the battery, and give timely warnings of possible battery failures
This solves the technical problems of poor accuracy and reliability of the internal state monitoring of lithium-ion batteries in the prior art, and the ultrasonic signal device is too large to be integrated into the battery management system and perform real-time monitoring of SOC and SOH in the battery working state. Monitoring Technical Issues

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  • Method and device for analyzing internal state of lithium battery based on ultrasonic spectrum
  • Method and device for analyzing internal state of lithium battery based on ultrasonic spectrum
  • Method and device for analyzing internal state of lithium battery based on ultrasonic spectrum

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Embodiment 1

[0046] Such as figure 1 As shown, this embodiment provides a device for analyzing the internal state of a lithium battery based on ultrasonic spectrum, which can be integrated in a battery management system to provide real-time monitoring and protection for the lithium battery. It includes an ultrasonic transmitting module, an ultrasonic receiving module and an ultrasonic signal processing module, wherein,

[0047] The ultrasonic transmitting module includes an excitation signal generation unit and multiple ultrasonic transducers. The excitation signal generation unit is used to provide excitation signals; the ultrasonic transducers are closely attached to the symmetrical positions on both sides of the lithium battery, and are used to be driven by the excitation signal to generate ultrasonic signals. Lithium-permeable battery; use a broadband ultrasonic transducer or multiple transducers with different resonant frequencies to receive ultrasonic signals at the same time to obta...

Embodiment 2

[0065] This embodiment provides a method for analyzing the internal state of a lithium battery based on ultrasonic spectrum, which is used to detect the SOC and SOH states of the lithium battery, including the following steps:

[0066] S1. Initialization of the detection device: make a calibration curve and obtain the relationship between the ultrasonic signal and the internal state of the lithium battery. The calibration curve includes the calibration curve of charging and discharging electricity and the calibration curve of sub-health and fault status.

[0067]S11. Obtain the linear relationship between the main lobe power of the ultrasonic signal and the state of charge: put the lithium battery on the experimental line, operate the battery management system to charge the lithium battery from an empty state to a saturated state, and then discharge it from a saturated state to an empty state. Detect the main lobe power of the ultrasonic signal, normalize the charging and disch...

Embodiment 3

[0075] This embodiment provides a method for analyzing the internal state of a lithium battery based on an ultrasonic sweep signal, which uses an FPGA to generate a sweep signal, drives an ultrasonic transducer, and obtains a frequency response function after penetrating the lithium-ion battery. Specifically include the following steps:

[0076] S1. Detection device initialization: Make a calibration curve to obtain the relationship between the frequency response function of the ultrasonic signal and the internal state of the lithium battery.

[0077] S11. Obtain the frequency response function of the ultrasonic signal: use the direct digital frequency synthesis module (dds) inside the FPGA to generate a sweeping signal to drive the ultrasonic transducer, and use ADC to collect after penetrating the lithium-ion battery to obtain the ultrasonic signal penetrating the lithium-ion The relationship between the output signal before and after the battery and the input signal is the ...

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Abstract

The invention discloses a method and a device for analyzing an internal state of a lithium battery based on an ultrasonic frequency spectrum. The method comprises the steps of enabling an ultrasonic signal with a set frequency to penetrate through the lithium battery, and calculating a charge state of the lithium battery by use of a linear relation between a main lobe power and a charge state of the ultrasonic signal; and judging the health of the lithium battery by use of the ratio of the power of the higher harmonics to the main lobe. Another method comprises the steps of driving an ultrasonic transducer by use of a swept-frequency signal to generate ultrasonic signals of different frequencies to penetrate through the lithium battery to obtain the frequency response function of the lithium battery; and judging the aging degree of the lithium battery by use of the frequency response function. The invention provides the device for analyzing the internal state of the lithium battery based on the ultrasonic frequency spectrum. According to the method and the device for analyzing the internal state of the lithium battery based on the ultrasonic frequency spectrum disclosed by the invention, the frequency spectrum of the ultrasonic signal is deeply analyzed, the problem that the SOC (State Of Charge) and SOH (State of Health) estimation of the lithium battery is not accurate is effectively solved, and the device can be integrated into a battery management system to realize the real-time measurement of the internal state of the battery, and timely make early warning for the possible failure of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and more specifically relates to a method and a device for analyzing the internal state of lithium batteries based on ultrasonic spectrum. Background technique [0002] The internal state of the battery mainly includes the battery state of charge (SOC) and battery state of health (SOH). [0003] Battery state of charge, full name State of Charge, also known as remaining power, represents the ratio of the remaining dischargeable power of the battery to the power of the fully charged state after the battery has been used for a period of time or left unused for a long time. [0004] Battery health status, the full name is State of Health, which means battery capacity, health, and performance status, that is, the ratio of performance parameters to nominal parameters after the battery has been used for a period of time. [0005] Accurate estimation of SOC and SOH is one of the main tasks of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/3842G01R31/388G01R31/392
CPCG01R31/3842G01R31/388G01R31/392
Inventor 金楚琪吴金洋吴加隽沈越黄云辉
Owner HUAZHONG UNIV OF SCI & TECH
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