CN103837581A - Detection device for lithium ion battery - Google Patents
Detection device for lithium ion battery Download PDFInfo
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- CN103837581A CN103837581A CN201410097943.0A CN201410097943A CN103837581A CN 103837581 A CN103837581 A CN 103837581A CN 201410097943 A CN201410097943 A CN 201410097943A CN 103837581 A CN103837581 A CN 103837581A
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Abstract
The invention relates to a detection device for a lithium ion battery. The detection device comprises an acoustic probe array, a magnet system, a triggering system and a signal detecting and processing system, wherein the acoustic probe array is connected with the signal detecting and processing system, and the signal processing system is connected with the triggering system and an acoustic signal acquiring system. Under the triggering control of the triggering system, the signal processing system and the acoustic signal acquiring system are started to work. The magnet system provides a static magnetic field to the lithium ion battery. The acoustic probe array is in contact with a housing of the lithium ion battery through a coupling agent. The lithium ion battery is arranged in the static magnetic field, and at an instant moment of charging or discharging the lithium ion battery, a lorentz force is generated in a battery medium under the action of an external magnetic field, and generates an acoustic signal, the acoustic signal is detected by acoustic probes arranged around the outer part of a battery, impedance information of a medium inside the battery is obtained by using the acoustic signal, and the detection of a defect inside the battery is realized through change of impedance.
Description
Technical field
The present invention relates to battery detecting technical field, particularly a kind of lossless detection method of lithium ion battery and device.
Background technology
The advantages such as lithium ion battery has zero pollution, zero-emission, energy density is high, body is less and service life cycle is long play a significant role as core component on electric automobile, power communication system and portable electric appts.Therefore more and more higher to the quality requirements of lithium ion battery.In electric automobile field, along with the development of global economy, the demand of the energy and consumption are increased day by day, greatly develop new-energy automobile, electricity consumption is one of Strategic Measure guaranteeing Chinese energy safety for oil, State Council explicitly points out about " electric automobile development in science and technology " 12 " ad hoc planning (summary) " simultaneously, China only develops pure electric automobile higher electrifing degree as new-energy automobile receives, and formulated the five-year-plan of three-step-march, the pure electric drive technology of expectation the year two thousand twenty will be occupied an leading position.The development of pure electric automobile and fuel cell car will significantly reduce exhaust emissions.And battery is as the core component of electric automobile, the assurance of its product quality is particularly important.In power communication system field, the operation of battery to communication system and electric energy support, for subsequent usely also play an important role.The design service life of battery is generally 8-10, and statistics shows that battery life ideally can reach 4-6, does not generally reach designing requirement, even has part battery to use 2-3 to scrap.Within 2010, Urumchi power administration statistics further shows, the communication power supply accident causing due to accumulator failure reaches 35%.In sum, the security performance to battery and reliability detect most important.
The safety problem that battery easily occurs in the process of preparation, transportation and use sums up and comprises the following aspects: (1) is because battery design technological problems may cause battery initial failure, leakage dehydration, deformation crack; (2) because the method for operation or the Cascading Methods of battery cause discharging and recharging deleterious in the location, periphery shop of electric battery; (3) because power supply quality and loading problem cause internal electrolyte solution partially crystallizable, affect internal resistance.At present traditional detection method adopts repeatedly to discharge and recharge to measure internal resistance or sample the mode of dissecting and detects, these detection method costs are high, the cycle is long and easily cause secondary to destroy to battery, are therefore badly in need of a kind of battery detection method that can real non-destructive.By patent retrieval, " the defect lossless detection method of lithium ion battery " application number 201210402595, launch ultrasonic signal by signal transmitting terminal to lithium ion battery to be measured, at receiving end received ultrasonic signal, utilize the intensity of transmit signal strength and reception signal to judge defective locations, the method needs extrinsic motivated.Find by the nearly step of patent retrieval, all to adopt the inferior mode of measuring internal resistance or sampling dissection that discharges and recharges to detect for lithium ion battery defect lossless detection method, can not carry out quick and nondestructive detection, and ultrasonic detection method needs extrinsic motivated.
Summary of the invention
The shortcoming that cycle of the object of the invention is to overcome traditional detection technology is long, cost is high and cause secondary to destroy to battery, overcome ultrasonic detecting technology needs the feature in extrinsic motivated source simultaneously, proposes a kind of lithium ion battery defect detecting device based on magnetoacoustic effect.The present invention does not need battery extrinsic motivated electric current, does not need battery to carry out secondary destruction yet, only need to measure acoustic signals, has function harmless, fast detecting.The present invention can play a significant role aspect battery quality assessment and life prediction.
Cardinal principle of the present invention is: lithium ion battery to be detected is placed in to static magnetic field, lithium ion battery is instantaneous charging or electric discharge, under the effect of externally-applied magnetic field, in battery medium, produce Lorentz force, Lorentz force will cause the generation of acoustical signal, detect acoustic signals by the sonic probe of arranging around outside batteries, utilize acoustic signals to obtain the electrical impedance information of inside battery medium, detect the inherent vice of battery by the variation of electrical impedance.
Lithium ion battery pick-up unit of the present invention mainly comprises sonic probe array, magnet system, triggering system, input disposal system, acoustical signal acquisition system, electrical impedance Inversion System and defect estimation system.
Described sonic probe array connects input disposal system, and the input end of signal processing system connects triggering system, and the output terminal of signal system connects acoustical signal acquisition system.Under the triggering control of triggering system, signal processing system harmony signal acquiring system startup work.Signal acquiring system is connected with electrical impedance Inversion System, and electrical impedance Inversion System connects defect estimation system.Magnet system can be that electromagnet can be also permanent magnet, and object is to offer static magnetic field for lithium ion battery.Sonic probe array is by the housing contacts of couplant and lithium ion battery.
The course of work of Li-ion Battery Testing System of the present invention is as follows:
Described triggering system is instantaneous for signal processing system provides trigger pip lithium ion cell charging or electric discharge, the startup work under the control of triggering system of signal processing system harmony signal acquiring system.Described lithium ion battery is placed in magnet system.Sonic probe array contacts with casing of lithium ion battery by couplant, instantaneous in lithium ion cell charging or electric discharge, lithium ion battery is under the effect of static magnetic field, inside lithium ion cell medium produces Lorentz force, sonic probe array received acoustic signals, acoustic signals is gathered by acoustical signal acquisition system after signal processing system, the acoustic signals collecting obtains inside battery dielectric resistance antinoise signal through electrical impedance Inversion System, and binding deficient judgement system is realized the judgement of inside lithium ion cell media defect.
The acoustic signals being obtained by sonic probe array in the course of work of the present invention meets acoustic pressure wave equation:
Wherein p is acoustic pressure, c
sfor the velocity of propagation of sound wave in medium, ▽ (J × B
0) be the Lorentz force divergence that inside battery medium produces, J inside lithium ion cell medium is at the current density of the instantaneous generation of charge or discharge, B
0the static magnetic field of inside lithium ion cell medium, B
0it is known quantity.By separating acoustic pressure wave equation, can calculate Lorentz force divergence ▽ (J × B
0),
Further obtain current density, J and electrical impedance by electrical impedance inversion algorithm.Defect estimation system stores the inside lithium ion cell electrical impedance spectral line obtaining under the intact and different defect situation of lithium ion battery as distinguishing rule, utilizes look-up method to differentiate the unknown defect situation of lithium ion battery.
The lithium ion battery detection method that the present invention is based on magnetoacoustic effect does not need extra electric excitation, only need to measure acoustic signals and just can realize the differentiation of inside lithium ion cell defect, the method has advantages of in real time, Non-Destructive Testing, has wide practical use and potential using value.
Accompanying drawing explanation
In the actual testing process of Fig. 1 apparatus of the present invention with the position relationship schematic diagram of lithium ion battery;
Fig. 2 system architecture schematic diagram of the present invention;
In figure: the positive and negative electrode of 1 lithium ion battery, 2 lithium ion batteries, 3 couplants, 4 sonic probe arrays, 5 magnet systems, 6 triggering systems, 7 signal processing systems, 8 acoustical signal acquisition systems, 9 electrical impedance Inversion Systems, 10 defect estimation systems.
Embodiment
Further illustrate the present invention below in conjunction with the drawings and specific embodiments.
As depicted in figs. 1 and 2, the Li-ion Battery Testing System that the present invention is based on magnetoacoustic effect mainly comprises sonic probe array 4, magnet system 5, triggering system 6, signal processing system 7, acoustical signal acquisition system 8, electrical impedance Inversion System 9 and defect estimation system 10.
Described sonic probe array 4 is connected with signal processing system 7.The input end of signal processing system 7 is connected with triggering system 6, and the output terminal harmony signal acquiring system 8 of signal processing system 7 connects.Acoustical signal acquisition system 8 is connected with electrical impedance Inversion System 9, and electrical impedance Inversion System 9 is connected with defect estimation system 10.Lithium ion battery to be detected 2 is placed in to magnet system 5, lithium ion battery 2 charge by the positive and negative electrode 1 of lithium ion battery or discharge instantaneous, make triggering system 6 produce trigger pip by induction mode, under the triggering control of triggering system 6, signal processing system 7 harmony signal acquiring system 8 startup work.Magnet system 5 can be that electromagnet can be also permanent magnet, and object is to offer static magnetic field for lithium ion battery.Sonic probe array 4 is by the housing contacts of couplant 3 and lithium ion battery 2.
The course of work of the present invention is as follows:
Described triggering system 6 is carried out the instantaneous for signal processing system 7 provides trigger pip of charge or discharge at lithium ion battery 2 by the positive and negative electrode 1 of lithium ion battery, the startup work under the control of triggering system 6 of signal processing system 7 harmony signal acquiring systems 8; Described lithium ion battery 2 is placed in magnet system 5; The even overcoupling agent 3 of sonic probe array 4 and lithium ion battery 2 housing contacts, instantaneous in lithium ion battery 2 charge or discharge, lithium ion battery 2 is under the effect of static magnetic field, inside battery medium produces Lorentz force, sonic probe array 4 receives acoustic signals, acoustic signals is gathered by acoustical signal acquisition system 8 after signal processing system, the acoustic signals collecting obtains inside battery dielectric resistance antinoise signal through electrical impedance Inversion System 9, and binding deficient judgement system 10 is realized the judgement of lithium ion battery 2 interior media defects.The acoustic signals being obtained by sonic probe array 4 in the course of work meets acoustic pressure wave equation:
Wherein p is acoustic pressure, c
sfor the velocity of propagation of sound wave in medium, ▽ (J × B
0) be the Lorentz force divergence that inside battery medium produces, J inside lithium ion cell medium is at the current density of the instantaneous generation of charge or discharge, B
0the static magnetic field of inside lithium ion cell medium, B
0it is known quantity.By separating acoustic pressure wave equation, can calculate Lorentz force divergence ▽ (J × B
0), further obtain current density, J and electrical impedance by electrical impedance inversion algorithm.10 of defect estimation systems are that the method mentioned by the present invention under the intact and different defect situation of lithium ion battery obtains inside lithium ion cell electrical impedance spectral line and stores as distinguishing rule, utilize look-up method to differentiate unknown defect situation.
Claims (2)
1. a lithium ion battery pick-up unit, it is characterized in that described lithium ion battery pick-up unit comprises sonic probe array (4), triggering system (6), signal processing system (7), acoustical signal acquisition system (8), electrical impedance Inversion System (9) and defect estimation system (10); Sonic probe array (4) is connected with signal processing system (7), the input end of signal processing system (7) is connected with triggering system (6), the output terminal harmony signal acquiring system (8) of signal processing system (7) connects, acoustical signal collection system (8) the electrical impedance Inversion System (9) of unifying connects, and electrical impedance Inversion System (9) is connected with defect estimation system (10); The positive and negative electrode (1) of lithium ion battery charge or discharge instantaneous, triggering system (6) produce trigger pip, under the triggering control of triggering system (6), signal processing system (7) harmony signal acquiring system (8) startup work; Described magnet system (5) provides static magnetic field for lithium ion battery; Described sonic probe array (4) is by the housing contacts of couplant (3) and lithium ion battery (2).
2. lithium ion battery pick-up unit according to claim 1, it is characterized in that described lithium ion battery to detect and be placed in static magnetic field, lithium ion battery is instantaneous charging or electric discharge, under the effect of externally-applied magnetic field, in battery medium, produce Lorentz force, Lorentz force will cause the generation of acoustical signal, detect acoustic signals by the sonic probe of arranging around outside batteries, utilize acoustic signals to obtain the electrical impedance information of inside battery medium, realize the detection of battery internal defect by the variation of electrical impedance.
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| WO2018090678A1 (en) * | 2016-11-21 | 2018-05-24 | 华中科技大学 | Method and apparatus for monitoring state of charge and health state of lithium-ion battery |
| TWI775787B (en) * | 2016-11-02 | 2022-09-01 | 美商費賽普公司 | Arrays of acoustic transducers for physical analysis of batteries |
| US11609210B2 (en) | 2013-08-15 | 2023-03-21 | University Of Maryland, College Park | Systems, methods, and devices for health monitoring of an energy storage device |
| US11658354B2 (en) | 2017-05-30 | 2023-05-23 | Titan Advanced Energy Solutions, Inc. | Battery life assessment and capacity restoration |
| US11764413B2 (en) | 2020-02-10 | 2023-09-19 | Titan Advanced Energy Solutions Inc | Battery testing systems and methods |
| US12025586B2 (en) | 2022-11-01 | 2024-07-02 | University Of Maryland, College Park | Systems, methods, and devices for health monitoring of an energy storage device |
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