CN103837581B - A kind of lithium ion battery pick-up unit - Google Patents
A kind of lithium ion battery pick-up unit Download PDFInfo
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- CN103837581B CN103837581B CN201410097943.0A CN201410097943A CN103837581B CN 103837581 B CN103837581 B CN 103837581B CN 201410097943 A CN201410097943 A CN 201410097943A CN 103837581 B CN103837581 B CN 103837581B
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Abstract
A kind of lithium ion battery pick-up unit, comprises sonic probe array, magnet system, triggering system and input disposal system.Sonic probe array connection signal detecting processing system, signal processing system connects triggering system harmony signal acquiring system.Under the trigging control of triggering system, signal processing system harmony signal acquiring system startup work.Magnet system is that lithium ion battery is supplied to static magnetic field.Sonic probe array is by the housing contacts of couplant and lithium ion battery.Lithium ion battery is placed in static magnetic field, lithium ion battery charging or electric discharge instantaneous, Lorentz force is produced in battery medium under the effect of externally-applied magnetic field, Lorentz force causes the generation of acoustical signal, acoustic signals is detected by the sonic probe arranged around outside batteries, utilize acoustic signals to obtain the electrical impedance information of inside battery medium, realized the detection of battery internal defect by the change of electrical 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 no pollution, zero-emission, energy density is high, body is less and service life cycle is long, electric automobile, power communication system and portable electric appts play a significant role as core component.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 is increased day by day with consuming, greatly develop new-energy automobile, electricity consumption generation oil is one of Strategic Measure ensureing Chinese energy safety, State Council explicitly points out about " electric automobile development in science and technology " 12 " ad hoc planning (summary) " simultaneously, pure electric automobile higher for electrifing degree is only received as new-energy automobile development by China, and formulated the five-year-plan of three-step-march, estimate that the pure electric drive technology of the year two thousand twenty will be occupied an leading position.The development of pure electric automobile and fuel cell car significantly will reduce exhaust emissions.And battery is as the core component of electric automobile, the guarantee of its product quality is particularly important.In power communication system field, battery supports the operation of communication system and electric energy, 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 percentage of batteries to use 2-3 to scrap.Within 2010, Urumchi power administration statistics shows further, and the communication power supply accident caused due to accumulator failure reaches 35%.In sum, detect most important to the security performance of battery and reliability.
The safety problem that battery easily occurs in preparation, transport and the process that uses sums up and comprises the following aspects: (1) may cause battery initial failure, leakage dehydration, deformation crack due to battery design technological problems; (2) because the method for operation of battery or Cascading Methods cause the periphery shop location discharge and recharge deleterious in electric battery; (3) because power supply quality and loading problem cause internal electrolyte solution partially crystallizable, internal resistance is affected.The mode that detection method traditional at present adopts repeatedly discharge and recharge to measure internal resistance or sampling dissection detects, these detection method costs are high, the cycle is long and easily cause man-made further destroy to battery, be therefore badly in need of a kind of can the battery detection method of real non-destructive.Pass through patent retrieval, " the defect lossless detection method of lithium ion battery " application number 201210402595, ultrasonic signal is launched to lithium ion battery to be measured by signal transmitting terminal, at receiving end received ultrasonic signal, utilize the intensity of transmit signal strength and Received signal strength to judge defective locations, the method needs extrinsic motivated.Found by the nearly step of patent retrieval, the mode being all employing time discharge and recharge measurement internal resistance or sampling dissection for lithium ion battery defect lossless detection method detects, can not carry out quick and nondestructive detection, and ultrasonic detection method needs extrinsic motivated.
Summary of the invention
The cycle that the object of the invention is to overcome traditional sensing techniques is long, cost is high and battery is caused to the shortcoming of man-made further destroy, overcome the feature that ultrasonic detecting technology needs extrinsic motivated source simultaneously, propose 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 to carry out man-made further destroy to battery yet, only needs to measure acoustic signals, has the function of harmless, quick detection.The present invention can play a significant role in battery quality assessment and life prediction.
Cardinal principle of the present invention is: lithium ion battery to be detected is placed in static magnetic field, lithium ion battery charging or electric discharge instantaneous, Lorentz force is produced in battery medium under the effect of externally-applied magnetic field, Lorentz force will cause the generation of acoustical signal, acoustic signals is detected by the sonic probe arranged around outside batteries, utilize acoustic signals to obtain the electrical impedance information of inside battery medium, detected the inherent vice of battery by the change 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 connection signal detecting processing system, the input end of signal processing system connects triggering system, and the output terminal of signal system connects acoustical signal acquisition system.Under the trigging 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 electromagnet also can be permanent magnet, and object is for lithium ion battery is supplied to static magnetic field.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 provides trigger pip the instantaneous of lithium ion cell charging or electric discharge for signal processing system, and signal processing system harmony signal acquiring system starts work under the control of triggering system.Described lithium ion battery is placed in magnet system.Sonic probe array is contacted 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 collected obtains inside battery dielectric resistance antinoise signal through electrical impedance Inversion System, and binding deficient judgement system realizes the judgement of inside lithium ion cell media defect.
The acoustic signals 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 sound wave velocity of propagation in media as well, ▽ (J × B
0) for inside battery medium produce Lorentz force divergence, J inside lithium ion cell medium in 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, Lorentz force divergence ▽ (J × B can be calculated
0),
Current density, J and electrical impedance is obtained further by electrical impedance inversion algorithm.The inside lithium ion cell electrical impedance spectral line obtained under the defect situation that lithium ion battery is intact and different stores as distinguishing rule by defect estimation system, 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 the differentiation that acoustic signals just can realize inside lithium ion cell defect, the method has in real time, the advantage of Non-Destructive Testing, has wide practical use and potential using value.
Accompanying drawing explanation
With the position relationship schematic diagram of lithium ion battery in the actual testing process of Fig. 1 apparatus of the present invention;
Fig. 2 present system structural representation;
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
The present invention is further illustrated 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 2 to be detected is placed in magnet system 5, lithium ion battery 2 by the positive and negative electrode 1 of lithium ion battery carry out charging or discharge instantaneous, triggering system 6 is made to produce trigger pip by induction mode, under the trigging control of triggering system 6, signal processing system 7 harmony signal acquiring system 8 starts work.Magnet system 5 can be electromagnet also can be permanent magnet, and object is for lithium ion battery is supplied to static magnetic field.Sonic probe array 4 passes through the housing contacts of couplant 3 and lithium ion battery 2.
The course of work of the present invention is as follows:
What described triggering system 6 carried out charge or discharge at lithium ion battery 2 by the positive and negative electrode 1 of lithium ion battery instantaneously provides trigger pip for signal processing system 7, and signal processing system 7 harmony signal acquiring system 8 starts work under the control of triggering system 6; 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 collected obtains inside battery dielectric resistance antinoise signal through electrical impedance Inversion System 9, and binding deficient judgement system 10 realizes the judgement of lithium ion battery 2 interior media defect.The acoustic signals obtained by sonic probe array 4 in the course of work meets acoustic pressure wave equation:
Wherein p is acoustic pressure, c
sfor sound wave velocity of propagation in media as well, ▽ (J × B
0) for inside battery medium produce Lorentz force divergence, J inside lithium ion cell medium in 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, Lorentz force divergence ▽ (J × B can be calculated
0), obtain current density, J and electrical impedance further by electrical impedance inversion algorithm.Defect estimation system 10 is that the method mentioned by the present invention under the defect situation that lithium ion battery is intact and different is obtained inside lithium ion cell electrical impedance spectral line and stores as distinguishing rule, utilizes 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 acquisition system (8) is connected with electrical impedance Inversion System (9), and electrical impedance Inversion System (9) is connected with defect estimation system (10); It is instantaneous that the positive and negative electrode (1) of lithium ion battery carries out charging or discharge, triggering system (6) produces trigger pip, under the trigging control of triggering system (6), signal processing system (7) harmony signal acquiring system (8) starts work; 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, described lithium ion battery pick-up unit is it is characterized in that to be placed in static magnetic field, lithium ion battery charging or electric discharge instantaneous, Lorentz force is produced in battery medium under the effect of externally-applied magnetic field, Lorentz force will cause the generation of acoustical signal, by the sonic probe array detection acoustic signals arranged around outside batteries, utilize acoustic signals to obtain the electrical impedance information of inside battery medium, realized the detection of battery internal defect by the change of electrical impedance.
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| US10014561B2 (en) | 2013-08-15 | 2018-07-03 | University Of Maryland, College Park | Systems, methods, and devices for health monitoring of an energy storage device |
| JP6596795B2 (en) * | 2016-09-30 | 2019-10-30 | ヤマハファインテック株式会社 | Ultrasonic image display method and ultrasonic image display system |
| US10809231B2 (en) * | 2016-11-02 | 2020-10-20 | Feasible, Inc. | Arrays of acoustic transducers for physical analysis of batteries |
| CN106772063B (en) | 2016-11-21 | 2018-03-20 | 华中科技大学 | A kind of method and its device for monitoring charge states of lithium ion battery and health status |
| CN110945709B (en) | 2017-05-30 | 2023-08-15 | 泰坦先进能源解决方案公司 | Battery life estimation and capacity recovery |
| CA3166290A1 (en) | 2020-02-10 | 2021-08-19 | Shawn D. Murphy | Battery testing systems and methods |
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