CN110108799A - The detection method and device of battery lithium ions transition state - Google Patents
The detection method and device of battery lithium ions transition state Download PDFInfo
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- CN110108799A CN110108799A CN201910495907.2A CN201910495907A CN110108799A CN 110108799 A CN110108799 A CN 110108799A CN 201910495907 A CN201910495907 A CN 201910495907A CN 110108799 A CN110108799 A CN 110108799A
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- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
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Abstract
The embodiment of the present application provides a kind of detection method and device of battery lithium ions transition state, belongs to battery performance analysis technical field.This method comprises: in multiple stages of the charge and discharge process for the lithium battery divided in advance, carry out Air Coupling ultrasound examination to the lithium battery in each stage, to obtain the ultrasound examination result in each stage；Ultrasound examination result based on each stage obtains ultrasonic scanning image corresponding with each stage；It is determined in the lithium battery based on each stage corresponding ultrasonic scanning image in the gas content in each stage；The lithium ion mobility state of the lithium battery is determined based on the gas content in the lithium battery in each stage.This method determines the lithium ion mobility state in charging and discharging lithium battery difference charge and discharge stage by Air Coupling ultrasound examination, reduces influence of the test to battery, improves the accuracy, sensitivity and visualization of testing result.
Description
Technical field
This application involves battery performance analysis technical fields, in particular to a kind of battery lithium ions transition state
Detection method and device.
Background technique
In lithium battery context of detection, existing detection is all lithium battery performance detection, is detected without physical property, and lithium is electric
The physical property in pond affects the height of the length of the whole quality and battery life of battery, performance.With automobile power
A large amount of uses of battery, lithium battery detection need a unified standard, and the performance to determine lithium battery is very necessary.
But conventional ultrasonic wave detection detects there are many restraining factors lithium battery, conventional ultrasound is super for contact
Sound, battery stress interior change will receive influence, and accuracy, sensitivity is lower, testing result is non-intuitive in the presence of detecting
Problem.
Summary of the invention
In view of this, a kind of detection method for being designed to provide battery lithium ions transition state of the embodiment of the present application and
Device, battery stress interior change will receive shadow when improving progress inside battery physical state detection existing in the prior art
It rings, and has that detection accuracy, sensitivity is lower, the non-intuitive problem of testing result.
The embodiment of the present application provides a kind of detection method of battery lithium ions transition state, which comprises is directed to
Multiple stages of the charge and discharge process of the lithium battery divided in advance carry out Air Coupling ultrasound to the lithium battery in each stage
Wave detection, to obtain the ultrasound examination result in each stage；Ultrasound examination result based on each stage obtain with it is each
Stage corresponding ultrasonic scanning image；It is determined in the lithium battery based on each stage corresponding ultrasonic scanning image
In the gas content in each stage；Based on the gas content in the lithium battery in each stage determine the lithium of the lithium battery from
Sub- transition state.
During above-mentioned realization, carried out using physical state of the Air Coupling ultrasound examination to the migration in lithium battery
Detection, is non-contact detection, inside battery will not be caused to change because of stress, also not need daubing coupling agent, avoid
Battery is stained.And Air Coupling ultrasound examination high sensitivity, penetrability is good, reaction speed is fast, to improve lithium battery
The detection accuracy of internal physical states and sensitivity.Air Coupling ultrasound examination also has the characteristics that high resolution, can
Lithium battery interior Ion transfer state is carried out visualization stage by stage to present, convenient for it is more intuitive, lithium electricity is well understood
The lithium ion mobility state in each stage inside pond.
Further, in multiple stages of the charge and discharge process for the lithium battery divided in advance, in each stage
Air Coupling ultrasound examination is carried out to the lithium battery, before obtaining ultrasonic scanning image corresponding with each stage,
The method also includes: obtain the frequency probe for being used for the Air Coupling ultrasound examination；It is determined according to the frequency probe
The positional relationship of Air Coupling focusing probe and the lithium battery, the Air Coupling focusing probe are two, and the position is closed
System includes: the relative positional relationship and the lithium battery and two air couplings of two Air Coupling focusing probes
Close the relative positional relationship of each Air Coupling focusing probe in focusing probe.
During above-mentioned realization, the frequency probe based on Air Coupling ultrasound examination adjusts Air Coupling focusing probe
The accuracy of testing result is further improved with the positional relationship of lithium battery to obtain better detection effect.
Further, in multiple stages of the charge and discharge process for the lithium battery divided in advance, in each stage
Air Coupling ultrasound examination is carried out to the lithium battery, before obtaining ultrasonic scanning image corresponding with each stage,
The method also includes: the preamplifier of the Air Coupling focusing probe is adjusted by gain, so that the Air Coupling
The ultrasonic wave that focusing probe issues can penetrate lithium battery and air.
During above-mentioned realization, preamplifier is adjusted by gain so that ultrasonic wave can penetrate lithium battery and sky
Gas, lithium battery interior physical state change there is bubble when, ultrasonic wave also can pass through lithium battery interior substance and
Air is completed lithium battery and is penetrated, and then the detection knot of lithium battery interior physical state is obtained according to the concrete outcome that ultrasonic wave penetrates
Fruit.
Further, the preamplifier for adjusting the Air Coupling focusing probe passes through gain, comprising: is based on institute
It states frequency probe and the positional relationship and sets initial by gain for the preamplifier of the Air Coupling focusing probe
Value；Obtain the acoustic signals by the lithium battery；Existed by obtaining ultrasonic wave to acoustic signals progress Fourier transformation
Propagation curve in the lithium battery；The preamplifier is adjusted to by gain from initial value based on the propagation curve
Detection is applicable in value.
During above-mentioned realization, the detection of lithium battery is obtained based on the Air Coupling focusing probe for setting initial value
Propagation curve the characteristics of, the relevant parameter of Air Coupling focusing probe is adjusted, it is ensured that accuracy in detection and be applicable in
Property.
Further, multiple stages of the charge and discharge process for the lithium battery divided in advance, in each stage pair
The lithium battery carries out Air Coupling ultrasound examination, to obtain ultrasonic scanning image corresponding with each stage, comprising: when
When the lithium battery is in the first stage in the multiple stage, judge whether the state-of-charge of the lithium battery reaches described
First stage corresponding default state-of-charge, the first stage are appointing in the multiple stage in the charge and discharge process
One stage；When the lithium battery reaches the default state-of-charge, suspend the charge or discharge of the lithium battery；To the lithium
Battery carries out Air Coupling ultrasound examination, to obtain ultrasonic scanning image corresponding with the first stage.
During above-mentioned realization, the charging process of lithium battery and discharge process are respectively divided into multiple stages, and
The charge and discharge process for suspending battery when the charge and discharge process of lithium battery proceeds to a certain stage, carries out the inspection of Air Coupling ultrasonic wave
It surveys, to obtain the ultrasonic scanning image in the stage under non-charged state, improves the essence of the ultrasonic scanning image of acquisition
Exactness.
Further, the ultrasound examination result based on each stage obtains ultrasonic wave corresponding with each stage and sweeps
Trace designs picture, comprising: it extracts in the ultrasound examination result in each stage perpendicular to the echo information in the acoustic beam section of ultrasonic wave, with
Corresponding ultrasonic scanning image of each stage is formed, the ultrasonic scanning image is used to indicate through the super of the lithium battery
The variation of the penetrating capacity of sound wave.
During above-mentioned realization, the penetrating capacity for indicating the ultrasonic wave by lithium battery is formed based on echo information
Variation ultrasonic scanning image, visualization display is carried out to the testing result of lithium battery interior physical state, improves inspection
Survey acquisition simplicity, intuitive and the accuracy of result information.
Further, the gas content based in the lithium battery in each stage determine the lithium of the lithium battery from
Sub- transition state, comprising: determined in the lithium battery based on the size of the first color in the ultrasonic scanning image
Gas content, color when first color is for indicating penetrating capacity lower than preset threshold.
During above-mentioned realization, by gas in lithium battery in different colours and cartographic represenation of area ultrasonic scanning image or
The current state and content of the lithium ion of other physical states, further enhance the visualization of testing result.
The embodiment of the present application also provides a kind of detection device of battery lithium ions transition state, described device includes: inspection
Module is surveyed, for multiple stages of the charge and discharge process for the lithium battery divided in advance, in each stage to the lithium battery
Air Coupling ultrasound examination is carried out, to obtain the ultrasound examination result in each stage；Scan image obtains module, is used for base
Ultrasonic scanning image corresponding with each stage is obtained in the ultrasound examination result in each stage；Gas content determines mould
Block, for determining that the gas in the lithium battery in each stage contains based on each stage corresponding ultrasonic scanning image
Amount；State determining module, for determined based on the gas content in the lithium battery in each stage the lithium of the lithium battery from
Sub- transition state.
Further, the detection module includes: frequency acquisition unit, is used for the Air Coupling ultrasonic wave for obtaining
The frequency probe of detection；Position adjustment unit, for determining Air Coupling focusing probe and the lithium according to the frequency probe
The positional relationship of battery, the Air Coupling focusing probe are two, and the positional relationship includes: that two Air Couplings are poly-
The relative positional relationship and each Air Coupling in the lithium battery and two Air Coupling focusing probes of coke probe
The relative positional relationship of focusing probe.
Further, the detection module further include: gain adjustment unit, for adjusting the Air Coupling focusing probe
Preamplifier by gain so that the ultrasonic wave that the Air Coupling focusing probe issues can penetrate lithium battery and sky
Gas.
Further, the gain adjustment unit is specifically used for: being based on the frequency probe and the positional relationship for institute
The preamplifier for stating Air Coupling focusing probe is set as initial value by gain；It obtains and believes by the sound wave of the lithium battery
Number；Propagation curve of the ultrasonic wave in the lithium battery is obtained by carrying out Fourier transformation to the acoustic signals；Based on institute
It states propagation curve and the preamplifier is adjusted to the applicable value of detection from initial value by gain.
Further, the detection module further include: state judging unit, for being in the multiple in the lithium battery
When first stage in the stage, judge the state-of-charge of the lithium battery whether reach the first stage it is corresponding preset it is charged
State, the first stage are the either phase in the multiple stage in the charge and discharge process；Pause unit is used for
When the lithium battery reaches the default state-of-charge, suspend the charge or discharge of the lithium battery；Image acquisition unit is used for
Air Coupling ultrasound examination is carried out to the lithium battery, to obtain ultrasonic scanning image corresponding with the first stage.
Further, described image acquiring unit be specifically used in the ultrasound examination result for extracting each stage perpendicular to
The echo information in the acoustic beam section of ultrasonic wave, to form corresponding ultrasonic scanning image of each stage, the ultrasonic scanning
Image is used to indicate the variation of the penetrating capacity of the ultrasonic wave by the lithium battery.
Further, the state determining module is specifically used for based on the first color in the ultrasonic scanning image
Size determines the gas content in the lithium battery, and first color is for indicating penetrating capacity lower than preset threshold
When color.
The embodiment of the present application also provides a kind of electronic equipment, the electronic equipment includes controller, charge and discharge device, sky
Gas couples focusing probe, transceiver and data storage, and the charging/discharging apparatus connects with the controller and lithium battery respectively
It connects, the transceiver is connect with the Air Coupling focusing probe and the data storage respectively.The controller is read
And when running corresponding computer program instruction, the electronic equipment executes the step in any of the above-described method；The charge and discharge
Device is used to control the charge and discharge process of the lithium battery；The transceiver is for controlling the data storage and the air
Couple the data transmission between focusing probe.
The embodiment of the present application also provides a kind of read/write memory medium, calculating is stored in the read/write memory medium
Machine program instruction when the computer program instructions are read and run by a processor, executes in above-mentioned any one method
Step.
Detailed description of the invention
Technical solution in ord to more clearly illustrate embodiments of the present application will make below to required in the embodiment of the present application
Attached drawing is briefly described, it should be understood that the following drawings illustrates only some embodiments of the application, therefore should not be seen
Work is the restriction to range, for those of ordinary skill in the art, without creative efforts, can be with
Other relevant attached drawings are obtained according to these attached drawings.
Fig. 1 is a kind of flow diagram of the environment perception method based on acoustics provided by the embodiments of the present application；
Fig. 2 is the flow diagram that a kind of positional relationship and movement relation provided by the embodiments of the present application determine step；
Fig. 3 is a kind of flow diagram of prompt step provided by the embodiments of the present application；
Fig. 4 is a kind of structural block diagram of the context aware systems based on acoustics provided by the embodiments of the present application.
Icon: context aware systems of the 20- based on acoustics；21- acoustic signal receives and dispatches array module；22- data processing mould
Block；23- image capture module；24- analog image display module；25- barrier hint module；26- controlling planning module；27- letter
Cease display module；30- electronic equipment；31- controller；32- charge and discharge device；33- Air Coupling focusing probe；34- transceiver；
35- data storage.
Specific embodiment
Below in conjunction with attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application is described.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.Meanwhile the application's
In description, term " first ", " second " etc. are only used for distinguishing description, are not understood to indicate or imply relative importance.
Through the applicant the study found that the detection of existing lithium battery is mostly the detection either charge and discharge speed of state-of-charge
The detection of degree, and lithium ion can migrate in charge and discharge process, and the conversion of physical state, lithium are carried out between gaseous state and solid-state
The physical state of ion can also impact the charge status of lithium battery.But existing interior of articles physical state
The multi-purpose traditional manifold type ultrasound detection of detection mode, conventional ultrasonic wave detection detect there are many restraining factors lithium battery,
Conventional ultrasound is contact ultrasound, and battery stress interior change will receive influence, it is also necessary to which daubing coupling agent in turn makes battery
At being stained, and battery pole ear also needs special protection with the company's of preventing point, there is that detection is complicated for operation, detection accuracy is lower, clever
Sensitivity is lower, the non-intuitive problem of testing result Data Representation.
Common acoustic couplant includes machine oil, colloid, water etc., these couplants require to clear up, it will usually make whole system
Become heavy, for Air Coupling ultrasound, ambient air is exactly its acoustic couplant, and high/low temperature workpiece and discomfort share
The workpiece of acoustic couplant also can be carried out Ultrasonic Nondestructive, and non-contact detection can be avoided and make to the internal environment of workpiece
At influence.Non-contact ultrasonic is similar with conventional Ultrasound detection, and maximum difference is that non-contact ultrasonic does not need acoustical coupling
Paint is applied on workpiece to be detected, ultrasonic wave can be passed through air borne into workpiece for measurement from transmitting probe well.
In turn, in order to solve, the detection in traditional detection mode is complicated for operation, detection accuracy is lower, sensitivity is lower, testing result
The non-intuitive problem of Data Representation, the present embodiment move the lithium ion of lithium battery using the detection of non-contact air coupling ultrasonic wave
Shifting state is detected, and a kind of detection method of battery lithium ions transition state is provided, and the executing subject of this method can be
PC (personal computer, PC), tablet computer, smart phone, personal digital assistant (personal
Digital assistant, PDA) etc. with logic computing function electronic equipment.
Referring to FIG. 1, Fig. 1 is a kind of stream of the detection method of battery lithium ions transition state provided by the embodiments of the present application
Journey schematic diagram.The detection method specific steps can be such that
Step S12: for multiple stages of the charge and discharge process of the lithium battery divided in advance, in each stage to the lithium
Battery carries out Air Coupling ultrasound examination, to obtain the ultrasound examination result in each stage.
Stage during charging and discharging lithium battery can be divided into any, optionally, need to obtain degree of precision
It, can be in the case where testing conditions, time conditions allow by a charging process or primary when more perfect testing result
Discharge process is divided into the stage as much as possible.
Lithium battery uses the residual capacity and the capacity of its fully charged state after lying idle for a period of time or for a long time
Ratio, commonly using percentage indicates, is state-of-charge (State of Charge, SOC).The division in above-mentioned stage generally according to
State-of-charge carries out, for example, charging process is divided into 0~20%, 21%~40%, 41%~60%, 61%~80%,
81%~100% 5 stage, or same charging process is divided into 0~30%, 31%~60%, 61%~90%,
91%~100% 5 stage.It should be understood that the divided stages can be the equal average division of each stage, it can also
To be to carry out non-average division according to the charge-discharge characteristic of lithium battery.
Optionally, in addition to the state-of-charge used in the present embodiment, above-mentioned divided stages are also based on the charge and discharge time
Or other standards carry out.
Step S14: the ultrasound examination result based on each stage obtains sonogram corresponding with each stage
Picture.
The image-forming principle of above-mentioned ultrasonic scanning image is similar with ultrasonic imaging, is to scan lithium battery using ultrasonic acoustic beam,
By reception, the processing to reflection signal, to obtain lithium battery interior image.Wherein, ultrasound examination result can be ultrasound
Wave obtains frequency, period, speed and the scattering for reflecting the acoustic beam of signal, diffraction, decay characteristics etc. after passing through lithium battery.
Step S16: it is determined in the lithium battery based on each stage corresponding ultrasonic scanning image in each rank
The gas content of section.
Occur gas in lithium battery since the migration of the lithium ion during charging and discharging lithium battery may result in, usually on
Stating gas may include carbon monoxide, carbon dioxide, formaldehyde, acetaldehyde etc., when charging and discharging lithium battery inside lithium ion mobility shape
State or other chemical reaction carry out degree can according to gas gas content number be determined.
Step S18: determine that the lithium ion of the lithium battery moves based on the gas content in the lithium battery in each stage
Shifting state.
Lithium battery, as carrier, provides transmission between positive and negative pole material usually using organic electrolyte for ion transmission
Path.And producing gas problem is using the FAQs of lithium battery when liquid electrolyte, usual lithium battery produces gas and occurs mainly in two
A stage: being the chemical conversion stage first, as Li+ (positively charged lithium ion) is persistently embedded among cathode, the potential of cathode
It is gradually reduced, when negative potential drops to 1V or so, in EC (ethylene carbonate) equal solvent and electrolyte in electrolyte
The additives such as VC (vinylene carbonate), FEC (fluorinated ethylene carbonate) start that reduction decomposition occurs in negative terminal surface, formed
SEI film (solid electrolyte interface film), and the gases such as CO (carbon monoxide), CO2 (carbon dioxide), C2H4 (acetaldehyde) are generated, because
This soft package lithium battery can all reserve gas chamber in process of production, and gas is discharged after producing gas；Second produces the more rank of gas
Mainly when lithium battery is overcharged because of improper use, reduction point can not only occur section when potential is lower for liquid electrolyte
Solution can also occur oxygenolysis in positive electrode surface when potential is excessively high and generate gas.Therefore, the present embodiment passes through lithium battery interior
Gas content be assured that the transition state of lithium ion, for example, lithium ion insertion cathode when charging, being desorbed from anode, fill
Gas content when electricity carries out presetting the stage to some in lithium battery is identical as the calibrating gas content in the stage, that is, can determine lithium
The lithium ion mobility state of battery standard lithium ion transition state corresponding with the calibrating gas content is identical.
It should be understood that can also be but be not limited to according to change in addition to above-mentioned lithium ion mobility state method of determination
It learns reaction formula and calculates the speed for generating gas, determine lithium ion mobility state further according to gas content.
In the present embodiment, above-mentioned steps are using Air Coupling ultrasound examination to the physical state of the migration in lithium battery
It is detected, is non-contact detection, inside battery will not caused to change because of stress, also not need daubing coupling agent, keep away
Exempt from battery to be stained.And Air Coupling ultrasound examination high sensitivity, penetrability is good, reaction speed is fast, to improve lithium
The detection accuracy of inside battery physical state and sensitivity.Air Coupling ultrasound examination also has the characteristics that high resolution,
Lithium battery interior Ion transfer state visualization stage by stage can be carried out to present, convenient for it is more intuitive, be well understood
The lithium ion mobility state in lithium battery interior each stage.
It should be understood that before executing step S12, it is also necessary to the Air Coupling of Air Coupling ultrasound examination
Focusing probe is configured, and the operating frequency range of Air Coupling focusing probe is generally 20KHz to 6.5MHz, is carrying out ultrasound
Frequency probe would generally be adjusted before wave detection according to the material and testing goal of workpiece to be detected, the present embodiment can be using row
The 400KHz frequency of standard commonly used in the trade is as frequency probe.
Optionally, in addition to focusing probes such as point focusing probe, line focus probes, the present embodiment can also be popped one's head in using plane
Or other customization probes are detected.
Further, after determining frequency probe, it is also necessary to determine Air Coupling focusing probe and lithium based on frequency probe
The positional relationship of battery.Wherein, two Air Coupling focusing probes are staggered relatively, and lithium battery is in two Air Coupling focusing probes
It is intermediate.Positional relationship includes the relative positional relationship and lithium battery and two air of two Air Coupling focusing probes
The relative positional relationship for coupling each Air Coupling focusing probe in focusing probe, can be two Air Coupling focusing probes
The distance between and each Air Coupling focusing probe and lithium battery the distance between.
In above-mentioned steps, the frequency probe based on Air Coupling ultrasound examination adjusts Air Coupling focusing probe and lithium
The positional relationship of battery further improves the accuracy of testing result to obtain better detection effect.
After completing the distance setting of Air Coupling focusing probe and lithium battery, it is also necessary to Air Coupling focusing probe
Preamplifier is adjusted by gain, is the echo amplitude regulated quantity of digital type ultrasound wave detection by gain, can also
To regard its sensitivity as.Since gas may be generated when lithium ion mobility in lithium battery, need by passing through the super of gas
The characteristic of sound wave obtains testing result, preamplifier should energy by the Air Coupling focusing probe after the completion of gain adjustment
Enough penetrate lithium battery and air, thus determined based on the peak value for penetrating the ultrasonic wave after lithium battery ultrasonic scanning image and
The internal material characteristic of lithium battery.Wherein, preamplifier refers to the circuit being placed between information source and amplifier or electronic equipment,
It is to aim to receive the weak voltage signals from information source and design, for amplifying ultrasonic testing signals, improves letter
It makes an uproar and compares, while enhancing the controllability and applicability of Air Coupling focusing probe.
Optionally, preamplifier can be 40dB, 60dB or other numerical value by gain, pass through the specific tune of gain
Save step referring to FIG. 2, Fig. 2 be a kind of flow diagram by gain adjustment step provided by the embodiments of the present application, it is as follows:
Step S11.1: based on the frequency probe and the positional relationship by the preposition of the Air Coupling focusing probe
Amplifier is set as initial value by gain.
The initial value can be the included conventional gain value of Air Coupling focusing probe, such as 20dB, 40dB, 60Db, this
Embodiment selects suitable initial value according to the positional relationship of frequency probe and Air Coupling focusing probe and lithium battery.
Step S11.2: the acoustic signals by the lithium battery are obtained.
Step S11.3: ultrasonic wave is obtained in the lithium battery by carrying out Fourier transformation to the acoustic signals
Propagation curve.
Propagation curve in the present embodiment can be DAC (Distance Amplitude Curve) curve or AVG curve
At least one of.
DAC curve is " distance-amplitude curve ", due to the defect of same size, because of sound path difference, and echo amplitude also not phase
Together, it indicates that sound path, ordinate indicate echo amplitude with abscissa, the highest point of different wave amplitudes corresponding to different sound paths is connected
At a smooth curve, which is the bus of DAC curve, on the basis of bus, is sentenced according to the input of corresponding examination criteria
Scrap wire, evaluates dB value corresponding to line at quantitative line, then obtains DAC curve.
AVG curve is the abbreviation of German distance, gain and size prefix, and english abbreviation is DGS (Distance Gain
Size), AVG curve is the curve of relationship between distance, echo height and the equivalent size of description rule reflector.
It should be understood that the Fourier transformation of above-mentioned acoustic signals can be Air Coupling focusing probe itself or match
The component of conjunction carries out automatically.
Step S11.4: the preamplifier is adjusted to from initial value by gain by detection based on the propagation curve
It is applicable in value.
When carrying out the detection of lithium battery, in order to obtain the testing result of more accurate, standard would generally obtain it is a certain solid
The echo of tentering degree, but the relative equivalent value of echo Yu DAC/AVG curve cannot be changed, then gain should be adjusted can obtain
Obtain the echo.In the present embodiment, the echo of the fixed amplitude be after lithium battery and air signal-to-noise ratio, echo amplitude,
Resolution ratio etc. meets the echo-signal of ultrasound examination standard.
In above-mentioned steps, the biography obtained is detected to lithium battery based on the Air Coupling focusing probe for setting initial value
The characteristics of broadcasting curve is adjusted the relevant parameter of Air Coupling focusing probe, it is ensured that accuracy in detection and applicability.
For step S12, need to carry out ultrasound examination to lithium battery in each stage, specific steps may include:
Step S12.1: when the lithium battery is in the first stage in the multiple stage, judge the lithium battery
Whether state-of-charge reaches the first stage corresponding default state-of-charge.
Wherein, the multiple stage respectively corresponds multiple and different state-of-charge ranges, which can be described
Either phase in multiple stages, corresponding default state-of-charge can be identical in charging process or discharge process for same stage
Or it is different.For example, when the lithium battery is in charging process, the first stage corresponding default state-of-charge be can be
The upper limit value of the first stage corresponding state-of-charge range；When the lithium battery is in discharge process, the first stage
Corresponding default state-of-charge can be the lower limit value of the first stage corresponding state-of-charge range.
Step S12.2: when the lithium battery reaches the default state-of-charge, suspend the charging of the lithium battery or put
Electricity.
It is exemplary, it is assumed that the first stage corresponding state-of-charge range is A%~B%, is somebody's turn to do when the lithium battery is in
When in the charging process of first stage, the first stage, corresponding default state-of-charge was just B%, needed to judge the lithium battery
State-of-charge whether reach B%, when the state-of-charge of the lithium battery reaches B%, pause to the lithium battery charge；Or
Person, when in the discharge process that the lithium battery is in the first stage, the first stage, corresponding default state-of-charge was just
A%, needs to judge whether the state-of-charge of the lithium battery reaches A%, when the state-of-charge of the lithium battery reaches A%,
Suspend the electric discharge of the lithium battery.
Step S12.3: carrying out Air Coupling ultrasound examination to the lithium battery, corresponding with the first stage to obtain
Ultrasonic scanning image.
In above-mentioned steps, the charging process of lithium battery and discharge process are respectively divided into multiple stages, and in lithium
The charge and discharge process of battery suspends the charge and discharge process of battery when proceeding to a certain stage, carry out Air Coupling ultrasound examination,
To obtain the ultrasonic scanning image of in stable condition lithium battery at this stage under non-charged state, the ultrasound of acquisition is improved
The accuracy of wave scan image.
For step S14, the step in the present embodiment be can specifically include: extract the ultrasound examination knot in each stage
It is described to form corresponding ultrasonic scanning image of each stage perpendicular to the echo information in the acoustic beam section of ultrasonic wave in fruit
Ultrasonic scanning image is used to indicate the variation of the penetrating capacity of the ultrasonic wave by the lithium battery.
Above-mentioned echo information can be the waveform peak of echo-signal, which can be but be not limited to
The region in lithium battery with different wave peak value is indicated using the pattern of different colours, shape.
Specifically, different with the waveform peak of the echo-signal of air through solid, the two is passed through difference by the present embodiment
Mode carries out image conversion and shows, to improve the readability and intuitive of ultrasound examination result.Such as one echo of setting is believed
The preset threshold of number penetrating capacity (peak value) indicates to contain air in lithium battery when being lower than the preset threshold, and being higher than, this is pre-
If indicating to be free of air in lithium battery when threshold value, then the present embodiment can use the face of the first color in ultrasonic scanning image
Product size determines the gas content in lithium battery, and the solid state part of lithium battery is indicated with other colors.
In above-mentioned steps, by gas in lithium battery in different colours and cartographic represenation of area ultrasonic scanning image or other
The current state and content of the lithium ion of physical state, further enhance the visualization of testing result.
It is carried out followed by the process of the detection method to battery lithium ions transition state provided in this embodiment specific
Illustrate:
Exemplary, selection hard shell lithium battery or soft package lithium battery are detected first, by the charge and discharge process of lithium battery
Multiple stages can be with for example, set a stage at interval of 10% for state-of-charge in charging process and discharge process respectively
0~10%, 11%~20%, 21%~30%, 31%~40%, 41%~50%, 51%~60%, 61%~70%,
71%~80%, 81%~90%, 91%~100%, charging current 1An are carried out by normal power when electric discharge, when charge and discharge
Between be 1 hour.
Can be using to threading method, one two Air Coupling focusing probes of receipts of a hair are staggered relatively, and setting frequency probe is
400kHz lies in a horizontal plane in lithium battery on the testing stand between two Air Coupling focusing probes, battery face and Air Coupling
Focusing probe face keeping parallelism, cell thickness 6mm, lithium battery are placed on two probe middle positions, probe and lithium battery spacing
37mm (probe can be adjusted with lithium battery spacing according to the variation of cell thickness)；
60dB can be set by the initial value of gain by preamplifier, ultrasonic signal is amplified 1000 times, is allowed
Ultrasound can penetrate air, the acoustic signals across lithium battery be obtained, based on the DAC/AVG after the acoustic signals Fourier transformation
For curve by preamplifier by gain adjustment value 21.6dB, voltage is adjusted to 220V；
The 0 state-of-charge detection of lithium battery charging process is carried out first, and lithium battery is normal condition, and ultrasonic wave all penetrates
For RED sector, edge blue portion is the part outside lithium battery boundary, and in order to distinguish battery core region, lithium battery edge is air
Film, ultrasonic echo peak value is low, and from 0 state-of-charge to 100% state-of-charge, charging process, Air Coupling focusing probe is not
It is interrupted multiple scanning lithium battery region and internal lithium ion mobility situation, testing result is judged by scanning lithium battery charged state
There is bubble or reach the default state-of-charge in each stage (such as 0 being the default state-of-charge of first stage, 11% be second
The default state-of-charge in stage etc.) when, physical property changes, and should suspend charging process, carries out comprehensive scanning.For example,
In this example, when the state-of-charge of lithium battery is 40%, scanning as the result is shown lithium battery interior occur gas (occur blue),
Ultrasonic echo peak value is lower than preset threshold, it is determined that the migration of lithium ion occurs in lithium battery interior when state-of-charge is 40%, leads
Cause it is internal chemical change occurs, further, when the state-of-charge of lithium battery is 60%, pass through scanning lithium battery as the result is shown
Internal gassy (being all blue), ultrasonic echo peak value are lower than preset threshold, it is determined that lithium battery when state-of-charge is 60%
Internal lithium ion mobility is complete, continues charging detection, until the internal still gassy of 100% state-of-charge detection, detection
As a result it is not different with 60% state-of-charge, lithium battery interior, which is shown, is all blue；
Then the 100% state-of-charge test of lithium battery discharge process is carried out, internal gassy (being all blue) surpasses
Sound echo-peak is lower than preset threshold, from 100% state-of-charge into 0 state-of-charge discharge process, Air Coupling focusing probe
Uninterrupted multiple scanning lithium battery region judges that internal lithium ion moves based on gas content by scanning lithium battery charged state
Shift one's love condition, testing result bubble occurs or reaches the default state-of-charge in each stage (such as in 100% presetting for the first stage
State-of-charge, 90% are default state-of-charge of second stage etc.), air entrapment fades away lithium battery during discharge,
There is the red position expression lithium ion mobility that ultrasonic echo peak value is higher than preset threshold, physical property changes, should
Suspend discharge process when reaching corresponding default state-of-charge of each stage during discharge, carries out comprehensive scanning, then carry out
The discharge examination of next stage, until 0 state-of-charge detects, lithium battery interior gas completely disappeared, lithium ion when 0 state-of-charge
Transition process terminates, and lithium battery region is whole red；
Gas is not present in lithium battery interior at the end of electric discharge, and lithium ion, which normally migrates, becomes solid-state, and ultrasonic penetration is good, should
The quality of lithium battery is shown as good.
In order to cooperate the detection method of above-mentioned battery lithium ions transition state provided in this embodiment, the present embodiment is also provided
A kind of detection device 20 of battery lithium ions transition state.
Referring to FIG. 3, Fig. 3 is a kind of knot of the detection device of battery lithium ions transition state provided by the embodiments of the present application
Structure block diagram.
The detection device 20 of battery lithium ions transition state includes detection module 21, scan image acquisition module 22, gas
Content determining module 23 and state determining module 24.
Detection module 21, for multiple stages of the charge and discharge process for the lithium battery divided in advance, in each stage
Air Coupling ultrasound examination is carried out to the lithium battery, to obtain the ultrasound examination result in each stage.
Scan image obtains module 22, obtains for the ultrasound examination result based on each stage corresponding with each stage
Ultrasonic scanning image.
Gas content determining module 23, for determining the lithium based on each stage corresponding ultrasonic scanning image
In the gas content in each stage in battery.
State determining module 24, for determining the lithium battery based on the gas content in the lithium battery in each stage
Lithium ion mobility state.
Optionally, detection module 21 further include: gain adjustment unit, before adjusting the Air Coupling focusing probe
Amplifier is set by gain, so that the ultrasonic wave that the Air Coupling focusing probe issues can penetrate lithium battery and air.
Gain adjustment unit is specifically used for: being focused the Air Coupling based on the frequency probe and the positional relationship
The preamplifier of probe is set as initial value by gain；Obtain the acoustic signals by the lithium battery；By to described
Acoustic signals carry out Fourier transformation and obtain propagation curve of the ultrasonic wave in the lithium battery；Based on the propagation curve by institute
It states preamplifier and the applicable value of detection is adjusted to from initial value by gain.
Optionally, detection module 21 further include: state judging unit, for being in the multiple stage in the lithium battery
In first stage when, judge whether the state-of-charge of the lithium battery reaches the first stage and corresponding preset charged shape
State, the first stage are the either phase in the multiple stage in the charge and discharge process；Pause unit, in institute
When stating lithium battery and reaching the default state-of-charge, suspend the charge or discharge of the lithium battery；Image acquisition unit, for pair
The lithium battery carries out Air Coupling ultrasound examination, to obtain ultrasonic scanning image corresponding with the first stage.
Image acquisition unit is specifically used for the acoustic beam in the ultrasound examination result for extracting each stage perpendicular to ultrasonic wave
The echo information in section, to form corresponding ultrasonic scanning image of each stage, the ultrasonic scanning image is for indicating
Pass through the variation of the penetrating capacity of the ultrasonic wave of the lithium battery.
Further, state determining module 24 is specifically used for the face based on the first color in the ultrasonic scanning image
Product size determines the gas content in the lithium battery, when first color is for indicating penetrating capacity lower than preset threshold
Color.
The present embodiment additionally provides a kind of electronics for executing the detection method of above-mentioned battery lithium ions transition state and sets
It is standby, referring to FIG. 4, Fig. 4 is the structural schematic diagram of a kind of electronic equipment provided by the embodiments of the present application.
Electronic equipment 30 includes controller 31, charge and discharge device 32, Air Coupling focusing probe 33, transceiver 34 and data
Memory 35.
Controller 31 is connect with charge and discharge device 32, and charge and discharge device 32 is also connect respectively with the positive and negative anodes of lithium battery to control
The charge and discharge process of lithium battery processed, for the setting of Air Coupling focusing probe 33 in lithium battery two sides, Air Coupling focusing probe 33 is equal
It is connect with transceiver 34, and will test data by transceiver 34 and be sent to data storage 35 and stored and analyzed.
Controller 31 can be computer, intelligent terminal, Cloud Server or other be able to carry out the control equipment of logical operation,
When it reads and runs corresponding computer program instruction, electronic equipment 30 executes the step in the above method.
Further, charge and discharge device 32 is used to control the charge and discharge process of lithium battery, and Air Coupling focusing probe 33 is used
In carrying out ultrasound detection to lithium battery, transceiver 34 is for controlling between data storage 35 and Air Coupling focusing probe 33
Data transmission.
In conclusion the embodiment of the present application provides a kind of detection method and device of battery lithium ions transition state, institute
The method of stating includes: multiple stages for the charge and discharge process of the lithium battery divided in advance, in each stage to the lithium battery
Air Coupling ultrasound examination is carried out, to obtain the ultrasound examination result in each stage；Ultrasonic wave inspection based on each stage
It surveys result and obtains ultrasonic scanning image corresponding with each stage；Based on each stage corresponding ultrasonic scanning image
Determine the gas content in the lithium battery in each stage；It is determined based in the lithium battery in the gas content in each stage
The lithium ion mobility state of the lithium battery.
During above-mentioned realization, carried out using physical state of the Air Coupling ultrasound examination to the migration in lithium battery
Detection, is non-contact detection, inside battery will not be caused to change because of stress, also not need daubing coupling agent, avoid
Battery is stained.And Air Coupling ultrasound examination high sensitivity, penetrability is good, reaction speed is fast, to improve lithium battery
The detection accuracy of internal physical states and sensitivity.Air Coupling ultrasound examination also has the characteristics that high resolution, can
Lithium battery interior Ion transfer state is carried out visualization stage by stage to present, convenient for it is more intuitive, lithium electricity is well understood
The lithium ion mobility state in each stage inside pond.
In several embodiments provided herein, it should be understood that disclosed device and method can also pass through
Other modes are realized.The apparatus embodiments described above are merely exemplary, for example, flow chart and block diagram in attached drawing
Show the device of multiple embodiments according to the application, the architectural framework in the cards of method and computer program product,
Function and operation.In this regard, each box in flowchart or block diagram can represent the one of a module, section or code
Part, a part of the module, section or code, which includes that one or more is for implementing the specified logical function, to be held
Row instruction.It should also be noted that function marked in the box can also be to be different from some implementations as replacement
The sequence marked in attached drawing occurs.For example, two continuous boxes can actually be basically executed in parallel, they are sometimes
It can execute in the opposite order, this depends on the function involved.It is also noted that every in block diagram and or flow chart
The combination of box in a box and block diagram and or flow chart can use the dedicated base for executing defined function or movement
It realizes, or can realize using a combination of dedicated hardware and computer instructions in the system of hardware.
In addition, each functional module in each embodiment of the application can integrate one independent portion of formation together
Point, it is also possible to modules individualism, an independent part can also be integrated to form with two or more modules.
It, can be with if the function is realized and when sold or used as an independent product in the form of software function module
It is stored in a computer readable storage medium.Based on this understanding, the technical solution of the application is substantially in other words
The part of the part that contributes to existing technology or the technical solution can be embodied in the form of software products, the meter
Calculation machine software product is stored in a storage medium, including some instructions are used so that a computer equipment (can be a
People's computer, server or network equipment etc.) execute each embodiment the method for the application all or part of the steps.
And storage medium above-mentioned includes: that USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited
The various media that can store program code such as reservoir (RAM, Random Access Memory), magnetic or disk.
The above description is only an example of the present application, the protection scope being not intended to limit this application, for ability
For the technical staff in domain, various changes and changes are possible in this application.Within the spirit and principles of this application, made
Any modification, equivalent substitution, improvement and etc. should be included within the scope of protection of this application.It should also be noted that similar label and
Letter indicates similar terms in following attached drawing, therefore, once it is defined in a certain Xiang Yi attached drawing, then in subsequent attached drawing
In do not need that it is further defined and explained.
The above, the only specific embodiment of the application, but the protection scope of the application is not limited thereto, it is any
Those familiar with the art within the technical scope of the present application, can easily think of the change or the replacement, and should all contain
Lid is within the scope of protection of this application.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
Claims (10)
1. a kind of detection method of battery lithium ions transition state, which is characterized in that the described method includes:
For multiple stages of the charge and discharge process of the lithium battery divided in advance, air is carried out to the lithium battery in each stage
Coupling ultrasonic wave detection, to obtain the ultrasound examination result in each stage；
Ultrasound examination result based on each stage obtains ultrasonic scanning image corresponding with each stage；
It is determined in the lithium battery based on each stage corresponding ultrasonic scanning image in the gas content in each stage；
The lithium ion mobility state of the lithium battery is determined based on the gas content in the lithium battery in each stage.
2. detection method according to claim 1, which is characterized in that in the charge and discharge for the lithium battery divided in advance
Multiple stages of electric process carry out Air Coupling ultrasound examination to the lithium battery in each stage, to obtain and each rank
Before the corresponding ultrasonic scanning image of section, the method also includes:
Obtain the frequency probe for being used for the Air Coupling ultrasound examination；
Determine that the positional relationship of Air Coupling focusing probe and the lithium battery, the Air Coupling are poly- according to the frequency probe
Coke probe is two, and the positional relationship includes: the relative positional relationship of two Air Coupling focusing probes and described
The relative positional relationship of lithium battery and each Air Coupling focusing probe in two Air Coupling focusing probes.
3. detection method according to claim 2, which is characterized in that in the charge and discharge for the lithium battery divided in advance
Multiple stages of electric process carry out Air Coupling ultrasound examination to the lithium battery in each stage, to obtain and each rank
Before the corresponding ultrasonic scanning image of section, the method also includes:
The preamplifier of the Air Coupling focusing probe is adjusted by gain, so that the Air Coupling focusing probe issues
Ultrasonic wave can penetrate lithium battery and air.
4. detection method according to claim 3, which is characterized in that before the adjusting Air Coupling focusing probe
It sets amplifier and passes through gain, comprising:
The preamplifier of the Air Coupling focusing probe is passed through into gain based on the frequency probe and the positional relationship
It is set as initial value；
Obtain the acoustic signals by the lithium battery；
Propagation curve of the ultrasonic wave in the lithium battery is obtained by carrying out Fourier transformation to the acoustic signals；
The preamplifier is adjusted to detection from initial value by gain based on the propagation curve and is applicable in value.
5. detection method according to claim 1, which is characterized in that the charge and discharge for the lithium battery divided in advance
Multiple stages of process carry out Air Coupling ultrasound examination to the lithium battery in each stage, to obtain and each stage
Corresponding ultrasonic scanning image, comprising:
When the lithium battery is in the first stage in the multiple stage, judge whether the state-of-charge of the lithium battery reaches
To the first stage corresponding default state-of-charge, the first stage is the multiple stage in the charge and discharge process
In either phase；
When the lithium battery reaches the default state-of-charge, suspend the charge or discharge of the lithium battery；
Air Coupling ultrasound examination is carried out to the lithium battery, to obtain sonogram corresponding with the first stage
Picture.
6. detection method according to claim 1, which is characterized in that the ultrasound examination result based on each stage
Obtain ultrasonic scanning image corresponding with each stage, comprising:
It extracts perpendicular to the echo information in the acoustic beam section of ultrasonic wave in the ultrasound examination result in each stage, it is each to be formed
Stage corresponding ultrasonic scanning image, the ultrasonic scanning image are used to indicate wearing for the ultrasonic wave for passing through the lithium battery
The variation of saturating energy.
7. detection method according to claim 6, which is characterized in that it is described based in the lithium battery in each stage
Gas content determines the lithium ion mobility state of the lithium battery, comprising:
The gas content in the lithium battery, institute are determined based on the size of the first color in the ultrasonic scanning image
Stating the first color is the color for indicating penetrating capacity lower than preset threshold when.
8. a kind of detection device of battery lithium ions transition state, which is characterized in that described device includes:
Detection module, for multiple stages of the charge and discharge process for the lithium battery divided in advance, in each stage to described
Lithium battery carries out Air Coupling ultrasound examination, to obtain the ultrasound examination result in each stage；
Scan image obtains module, obtains ultrasound corresponding with each stage for the ultrasound examination result based on each stage
Wave scan image；
Gas content determining module, for being determined in the lithium battery based on each stage corresponding ultrasonic scanning image
In the gas content in each stage；
State determining module, for determined based on the gas content in the lithium battery in each stage the lithium of the lithium battery from
Sub- transition state.
9. a kind of electronic equipment, which is characterized in that the electronic equipment includes controller, charge and discharge device, Air Coupling focusing
Probe, transceiver and data storage, the charge and discharge device are connect with the controller and lithium battery respectively, the transmitting-receiving
Device is connect with the Air Coupling focusing probe and the data storage respectively；
When the controller reads and runs corresponding computer program instruction, the electronic equipment perform claim requires 1-7 any
Step in item the method；The charge and discharge device is used to control the charge and discharge process of the lithium battery, and the transceiver is used
It is transmitted in controlling the data between the data storage and the Air Coupling focusing probe.
10. a kind of read/write memory medium, which is characterized in that be stored with computer program in the read/write memory medium and refer to
It enables, when the computer program instructions are read and run by a processor, perform claim is required in any one of 1-7 the method
Step.
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