CN208297685U - A kind of non-destructive testing device obtaining the distribution of inside lithium ion cell state - Google Patents
A kind of non-destructive testing device obtaining the distribution of inside lithium ion cell state Download PDFInfo
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- CN208297685U CN208297685U CN201820907470.XU CN201820907470U CN208297685U CN 208297685 U CN208297685 U CN 208297685U CN 201820907470 U CN201820907470 U CN 201820907470U CN 208297685 U CN208297685 U CN 208297685U
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Abstract
The utility model discloses a kind of non-destructive testing devices of acquisition inside lithium ion cell state distribution, belong to lithium ion battery detection field, it includes supersonic sounding unit, scanning unit and frame auxiliary unit, supersonic sounding unit, scanning unit are arranged on auxiliary frame unit, auxiliary frame unit includes thermostat and support frame, support frame is used to provide installation and support place for supersonic sounding unit, scanning unit, supersonic sounding unit includes liquid immersion type ultrasonic probe, and scanning unit realizes supersonic sounding unit and lithium ion battery to be detected relative movement.Utility model device makes detection under the premise of not destroying battery structure, influencing battery original performance, to the internal state distribution of battery, obtains inside lithium ion cell state and is distributed.
Description
Technical field
The utility model belongs to lithium ion battery detection field, more particularly, to a kind of acquisition inside lithium ion cell
The non-destructive testing device of state distribution.
Background technique
Lithium ion battery is a kind of important secondary cell, has high voltage platform, high storage energy density, relatively long
Service life, higher output power and the advantages that memory-less effect, become the master of all kinds of advanced portable electronic products
Mating power supply is wanted, also there is absolute advantage in fields such as electric car, energy-accumulating power stations.
With the development of demand, the monomer capacity of lithium ion battery is become greatly, and volume is also continuously increased.With cell body
The problem of long-pending increase, inside battery active material, electrolyte is unevenly distributed, becomes important.This inside battery it is different
Cause property will cause in battery charge and discharge process internal electricity, Temperature Distribution it is inconsistent, it is old so as to cause inside battery each section
It is different to change speed, and different aging speeds has been further exacerbated by this inconsistency, eventually leads to the service life contracting of battery
Subtract, performance declines the generation for even resulting in the dangerous situations such as the super-charge super-discharge overheat of battery part.
Battery testing means traditional at present are current and voltage method, by carrying out charge and discharge to battery and recording its electricity ginseng
Thus the performance of battery is inferred in several variations.This means are only capable of obtaining the quality of battery overall performance, can not obtain battery
The quality of internal consistency.There has been no any equipment or technology to obtain in the case where not destroying battery at present
The distribution situation of inside battery state does a synthesis judgment analysis to the inner case of battery.
Therefore, it is necessary to develop one kind novel device or method to obtain the distribution of inside lithium ion cell state, so as to
Battery quality is preferably quickly judged, and provides data to the exploitation of battery design and supports.
Utility model content
Aiming at the above defects or improvement requirements of the prior art, the utility model provides in a kind of acquisition lithium ion battery
The non-destructive testing device of portion's state distribution is not being destroyed battery structure, is being influenced it is intended that providing a kind of completely new device
Under the premise of the original performance of battery, detection is made to the internal state distribution of battery, obtains the distribution of inside lithium ion cell state.
To achieve the above object, the utility model provides a kind of lossless inspection of acquisition inside lithium ion cell state distribution
Survey device comprising supersonic sounding unit, scanning unit, electric performance test unit and auxiliary frame unit, wherein
Supersonic sounding unit and scanning unit are arranged in frame auxiliary unit,
The frame auxiliary unit includes thermostat and support frame, and thermostat is used to provide survey for lithium ion battery to be detected
Examination hall institute, is also used to provide required coupling environment for supersonic sounding unit, and support frame is used to be supersonic sounding unit, scanning list
Member provides installation and support place,
The supersonic sounding unit includes the liquid immersion type ultrasonic probe of at least two pairs different frequencies, and the liquid immersion type ultrasound is visited
Head is for executing ultrasound detection to lithium ion battery to be detected in coupling environment, at least one in the liquid immersion type ultrasonic probe
Pair frequency between 1.5MHz to 10MHz, at least a pair of frequency is between 0.1MHz to 1.5MHz.The original designed in this way
Because being: ultrasonic signal of the frequency in 1.5MHz to 10MHz is very sensitive to the response of negative electrode of lithium ion battery analysis lithium phenomenon, warp
Analysis is to reflect the super of the frequency range because the fresh lithium surface being precipitated can be reacted with electrolyte generates micro gas
Sound wave；Frequency 0.1MHz to 1.5MHz ultrasonic signal to analysis lithium phenomenon it is insensitive, analyzed, be because sound wave wavelength compared with
It is long, can bypass small analysis lithium bubble by diffraction, but the ultrasonic wave of the frequency overheats battery, the production gas phenomenon that overcharges with
And the fluid injection defect in production process is more sensitive, this is because battery is overheated, is overcharged, bubble caused by fluid injection defect is larger,
The ultrasonic wave of 0.1MHz to 1.5MHz is set to be difficult to penetrate.The ultrasonic probe of different frequency can detecte different inside batteries and become
Change.
The scanning unit relatively moves for realizing supersonic sounding unit and lithium ion battery to be detected, is treated with realizing
The detection in lithium ion battery full volumetric is detected,
The electric performance test unit is by carrying out constant current/constant voltage charge and discharge to lithium ion battery to be detected and obtaining battery
Voltage and current information, using the auxiliary information as inside battery status assessment.
Further, the supersonic sounding unit further includes ultrasonic signal emission receiving unit and high-frequency signal line, liquid
Immersion ultrasonic probe is connected by high-frequency signal line with ultrasonic signal emission receiving unit, and the liquid immersion type ultrasonic probe goes out in pairs
Existing, a liquid immersion type ultrasonic probe in a pair of of liquid immersion type ultrasonic probe is launched under the control of ultrasonic signal emission receiving unit
Ultrasonic signal pulse, the ultrasonic probe of another liquid immersion type is used to receive carrying of projecting from lithium ion battery to be detected
The ultrasonic pulsative signal of detection information, ultrasonic signal emission receiving unit are also used to carry the super of detection information to what is received
Ping is converted, quantified and is recorded.
Further, the scanning unit includes two linear slide mould groups and probe fixing bracket, two linear slide mould group phases
It is mutually vertically arranged, and is located on y-z plane, each linear slide mould group includes the cunning of a sliding rail and setting on the slide rail
Block, sliding block can be arranged on sliding block along the opposite sliding of sliding rail, probe fixing bracket, can be moved with sliding, liquid immersion type ultrasonic probe
It is arranged on probe fixing bracket.
Further, the liquid immersion type probe has multipair, and multipair liquid immersion type probe is arranged on probe fixing bracket, is located at
Mesuring battary two sides, it is opposite to arrange, multipair liquid immersion type probe, one end of probe fixing bracket and sliding block are capable of fixing on probe fixing bracket
Mutually fixed, the other end protrudes into the coupling liquid of thermostat, by mobile liquid immersion type probe or battery to be detected to realize to battery
Each section is detected, so as to obtain the status information in battery everywhere.
Further, the frame auxiliary unit further includes insulating layer, refrigerating module and heating module, the insulating layer packet
It covers in thermostat outer wall, with for keeping the temperature, the refrigerating module and the heating module are arranged at thermostat, in use, logical
The operating status for crossing control refrigerating module and heating module carrys out the temperature of coupling liquid in control flume.
A kind of detection method of device as described above, which is characterized in that it includes the following steps:
Step 1: liquid immersion type ultrasonic probe is installed on probe fixing bracket, mesuring battary is fixed in thermostat and is filled
Enter the liquid for conducting ultrasonic signal；
Step 2: controlling the refrigerating module and heating module of thermostat, constant temperature tank liquid is heated or is cooled to sets
Determine temperature；
Step 3: control ultrasonic signal emission receiving unit issues ultrasound letter by the liquid immersion type ultrasonic probe of battery side
It feels the pulse punching, ultrasonic signal pulse is penetrated and projected outside battery to be detected, is taken by the liquid immersion type ultrasonic probe reception of the battery other side
Ultrasonic pulsative signal with detection signal；
Step 4: control linear slide mould group drives liquid immersion type ultrasonic probe to movement, performs the next step scanning to battery,
It is performed simultaneously the work of step 3；
Step 5: control electric performance test unit carries out mesuring battary to detect required charge and discharge, while carrying out step
Four；
Step 6: summarizing test data, handles data, ultrasonic energy when by scanning after battery
Value or the arrival time value of ultrasonic signal map to hsv color space in proportion, to obtain ultrasonic signal puppet chromatic graph.It is logical
The lower obtained pseudo- chromatic graph of popping one's head in of overfrequency to battery overheat, overcharges fluid injection in produced gas production gas and production process
Defect is tested and analyzed；Lithium phenomenon is analysed to negative electrode of lithium ion battery by the higher obtained pseudo- chromatic graph of popping one's head in of frequency to examine
Survey analysis.
Further, using a kind of testing result of frequency as reference data, the test result under multi-frequency is carried out
Linkage calculates, to obtain the distributed image of each different conditions parameter of battery.Such as calculate the energy of the probe of multiple frequencies
The arithmetic square root of value, multiplied by threshold value is used as after 50%, in image obtained by low-frequency probe, energy is less than threshold value and area is greater than electricity
The region of pool area 3% is the residual Bubble Region in battery forming process to obtain Battery formation residual bubble diagram；High frequency is visited
In head image, the not shown energy of low-frequency probe is less than threshold value and area is greater than the region of cell area 2% for the area Xi Li, thus
Obtain the analysis lithium distribution map of battery.
In general, it can obtain down the above technical solutions conceived by the present invention are compared with the prior art,
Column the utility model has the advantages that
The device announced by the utility model can be realized easily in the case where not damaging battery to battery
Electrolyte inside, active material are analysed the detections of states such as lithium, battery capacity, cell health state and are made to battery quality and comment
Sentence.
Detailed description of the invention
Fig. 1 is the first view that the device of inside lithium ion cell state distribution is obtained in the utility model embodiment；
Fig. 2 is the side view that the device of inside lithium ion cell state distribution is obtained in the utility model embodiment；
Fig. 3 is the second view that the device of inside lithium ion cell state distribution is obtained in the utility model embodiment.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only to explain this
Utility model is not used to limit the utility model.In addition, involved in the various embodiments of the present invention described below
And to technical characteristic can be combined with each other as long as they do not conflict with each other.
The utility model provides the non-destructive testing device and its method of a kind of acquisition inside lithium ion cell state distribution,
Wherein, obtain inside lithium ion cell state distribution device by supersonic sounding unit, scanning unit, electric performance test unit,
Four parts of auxiliary frame unit form.
Specifically, supersonic sounding unit is by multipair liquid immersion type ultrasonic probe, ultrasonic signal emission reception device and high frequency
Signal line group is at liquid immersion type ultrasonic probe is connected by signal wire with ultrasound emission reception device.Multipair ultrasonic probe is solid in opposite directions
Be scheduled on the probe holder for being distributed in mesuring battary two sides, can be moved together with probe fixing bracket, by its frequency and focal length into
Row optimization has scanning accuracy more higher than empty coupling probe or traditional normal probe and accuracy.Ultrasonic signal emission receives dress
It sets to generate and provides signal source with pulse signal used that match of popping one's head in come the probe for side, and connect by the probe of the other side
Receive the ultrasonic signal after battery.
Scanning unit is made of two linear slide mould groups, probe fixing bracket, and two linear slide mould groups are mutually perpendicular to arrange, is visited
Head frame one end is extend into the ultrasonic coupling liquid of insulating box with the connected other end of mould group sliding block.Linear slide mould group is with spy
Head frame moves on y-z axial plane, achievees the purpose that detect battery each section by mobile probe or battery.
Electric performance test unit main body is battery charging and discharging tester, can carry out constant current/constant voltage charge and discharge to mesuring battary
Electricity and the voltage and current information for obtaining such battery in the process, the auxiliary foundation as battery status judgement.
Auxiliary frame unit is made of thermostat and related support, is responsible for stable needed for supersonic sounding provides
Couple environment, and solid mechanical device and mesuring battary, the even running for guaranteeing mechanical device.Thermostat includes sink, heat preservation
Layer, refrigerating module and the multiple components of heating module.Insulating layer is wrapped on the outside of sink, and sink is provided with ultrasonic coupling liquid, passes through
The operation of control refrigerating module and heating module carrys out coupling liquid temperature in control flume.
For more detailed description utility model device, further illustrate with reference to the accompanying drawing.
Fig. 1 is the first view that the device of inside lithium ion cell state distribution is obtained in the utility model embodiment；Fig. 2
It is the side view that the device of inside lithium ion cell state distribution is obtained in the utility model embodiment；Fig. 3 is the utility model
The second view of the device of inside lithium ion cell state distribution is obtained in embodiment.As seen from the figure, it obtains in lithium ion battery
The device of portion's state distribution includes supersonic sounding unit, scanning unit, electric performance test unit and auxiliary frame unit,
In, 1 is temperature-controlling system, and 2 be device framework, and 3 be battery charging and discharging unit, and 4 be temperature control box, and 5 be probe fixing bracket, and 6 be ultrasound
Signal emits receiving unit, and 7 is move horizontally mould group, and 8 is vertically move mould group, and 9 be heat exchanger fin, and 10 visit for liquid immersion type ultrasound
Head, 11 be mesuring battary.
Wherein, supersonic sounding unit includes ultrasonic signal emission receiving unit 6 and liquid immersion type ultrasonic probe 10, scanning unit
It including probe fixing bracket 5, moves horizontally mould group 7 and vertically moves mould group 8, electric performance test unit main body is battery charging and discharging survey
Instrument is tried, auxiliary frame unit includes temperature-controlling system 1, device framework 2, temperature control box 4 and heat exchanger fin 9, temperature control system 1 and temperature control box 4
It is placed on the pedestal of device framework 2, temperature control box includes heat exchanger fin 9, and temperature control system 1 is connected with heat exchanger fin 9, by heating or cold
But heat exchanger fin 9 come achieve the purpose that control temperature control box 4 (temperature control box also corresponds to thermostat) interior temperature.Battery charging and discharging unit 3
It is placed in be connected by charge and discharge electric lead with mesuring battary 11, being executed during the test to mesuring battary above temperature-controlling system
11 charge and discharge step.
It vertically moves mould group 8 to be fixed on vertically on device framework 2, moves horizontally mould group 7 and be horizontally fixed on and vertically move mould
90 degree are formed with vertical mould on the sliding block of group 8.Probe fixing bracket 5 is mounted on straight down on the sliding block for moving horizontally mould 7.Vertically
The sliding block of mobile mould group 8, which can drive, to be moved horizontally mould 7 and moves up and down in overall together with the object in mould group, and the cunning of mould 7 is moved horizontally
Probe holder side-to-side movement on block energy band movable slider.
Ultrasonic signal emission receives the rear that system 6 is mounted on device framework 2, by coaxial signal line and probe fixing bracket 5
A pair of of probe of upper installation is connected.
The method for obtaining the distribution of inside lithium ion cell state includes the test method of battery and simulation work under static condition
The test method of battery under condition:
The test method of battery under static condition:
One, on probe holder Mounting frequency be respectively 1.0MHz and 5.0MHz two pairs of ultrasonic probes.By mesuring battary (this
It is double to step on 25Ah ternary battery in embodiment) it is fixed in thermostat, DOW CORNING PMX200 50cs methyl-silicone oil is poured into as super
Acoustic couplant.
Two, the temperature for setting thermostat, is heated to 25 DEG C for tank liquid.
Three, emitted with the matched ultrasonic signal of probe and received by ultrasonic signal emission reception device.Simultaneously by passing through control
System, which moves horizontally mould group and vertically moves moving for mould group top shoe, carrys out the scanning that mobile probe carries out entirety to battery.
Four, the ultrasound information that battery different parts are achieved in step 3, handles data, electricity when by scanning
The ultrasonic signal energy of Chi Gedianchu is integrated, and the ultrasonic gross energy after battery is obtained, by minimum energy to can
Amount is mapped in proportion between 0h to the 120h in hsv color space, is mapped to paint to battery each section.
Five, further, using a kind of testing result figure of frequency as reference data, to the test result under multi-frequency
Linkage calculating is carried out, to obtain the distributed image of each different conditions parameter of battery.For example, using low-and high-frequency probe gained letter
Number figure makees quotient, as associated eigenvalue, reflects inside battery electrolyte distributing homogeneity with this.Such as calculate the spy of multiple frequencies
The arithmetic square root of the energy value of head, multiplied by threshold value is used as after 50%, in image obtained by low-frequency probe, energy is less than threshold value and face
It is the residual Bubble Region in battery forming process to obtain Battery formation residual bubble that product, which is greater than the region of cell area 3%,
Figure；In high frequency probe image, the not shown energy of low-frequency probe is less than threshold value and area is greater than the region of cell area 2% for analysis
Lithium area, to obtain the analysis lithium distribution map of battery.COMPREHENSIVE CALCULATING electrolyte inside distribution map, residual bubbles figure and analysis lithium distribution
Figure, obtain the state scattergrams such as cell health state, for battery quality under static conditions judgement and developmental research provide according to
According to.
Simulate the test method of battery under operating condition:
One, on probe fixing bracket Mounting frequency be respectively 0.5MHz and 2.0MHz two pairs of ultrasonic probes.By electricity to be measured
Pond (be in the present embodiment double step on 25Ah ternary battery) is fixed in thermostat, and DOW CORNING PMX200 50cs methyl-silicone oil is poured into
As ultrasonic coupling agent.
Two, emitted with the matched ultrasonic signal of probe and received by ultrasonic signal emission receiving unit.Pass through control simultaneously
It moves horizontally mould group and vertically moves moving for mould group top shoe and carry out the scanning that mobile probe carries out entirety to battery.
Three: carrying out the charge and discharge for carrying out 0.5C while step 2 to battery.By by under battery difference state-of-charge not
Energy size with the ultrasonic signal information at position is compared with the calibration curve tested under obtained different SOC in advance, is obtained
Inside battery SOC distribution map in charging process.
Four: further, ultrasonic signal energy when by scanning at battery each point integrates, and obtains across battery
Minimum energy to highest energy is mapped to hsv color space by ultrasonic gross energy afterwards in proportion, thus in battery each section
Color mapping.Using a kind of testing result of frequency as reference data, the test result under multi-frequency is calculated.Obtain electricity
The state scattergrams such as liquid, active material, analysis lithium, battery capacity, cell health state are solved, in conjunction with battery charging and discharging information, thus
Assess dynamic conformance internal in the practical charge and discharge process of battery.
Five: it is further, the set temperature in two is changed the step, temperature is reduced to 0 DEG C, carries out step 3 again, is led to
The situation of change of overwriting battery each point ultrasonic signal obtains internal exergy dissipation when battery charging and discharging under low temperature in conjunction with charge and discharge power information
It loses points Butut, to assess the cryogenic property of battery.
As it will be easily appreciated by one skilled in the art that the above is only the preferred embodiment of the utility model only, not
To limit the utility model, any modification made within the spirit and principle of the present invention, equivalent replacement and change
Into etc., it should be included within the scope of protection of this utility model.
Claims (6)
1. a kind of non-destructive testing device for obtaining the distribution of inside lithium ion cell state, which is characterized in that it includes supersonic sounding
Unit, scanning unit and frame auxiliary unit, wherein
Supersonic sounding unit and scanning unit are arranged in frame auxiliary unit,
The frame auxiliary unit includes thermostat and support frame, and thermostat is used to provide checkout area for lithium ion battery to be detected
Institute, wherein being equipped with liquid, support frame is used to provide installation and support place for supersonic sounding unit and scanning unit,
The supersonic sounding unit includes the liquid immersion type ultrasonic probe of at least two pairs different frequencies, and the liquid immersion type ultrasonic probe is used
In coupling environment in lithium ion battery to be detected execute ultrasound detection,
The scanning unit relatively moves for realizing supersonic sounding unit and lithium ion battery to be detected, to realize to be detected
Detection in lithium ion battery full volumetric.
2. a kind of non-destructive testing device for obtaining the distribution of inside lithium ion cell state as described in claim 1, feature exist
In, it further include electric performance test unit, the electric performance test unit is used to carry out charge and discharge to lithium ion battery to be detected, and
The voltage and current information for recording battery, to obtain the internal state of battery under different charging and discharging states.
3. a kind of non-destructive testing device for obtaining the distribution of inside lithium ion cell state as claimed in claim 2, feature exist
In the supersonic sounding unit further includes ultrasonic signal emission receiving unit and high-frequency signal line, and liquid immersion type ultrasonic probe is logical
It crosses high frequency signal wire to be connected with ultrasonic signal emission receiving unit, the liquid immersion type ultrasonic probe occurs in pairs, a pair of of liquid immersion type
A liquid immersion type ultrasonic probe in ultrasonic probe is used to launch ultrasonic signal under the control of ultrasonic signal emission receiving unit
Pulse, the ultrasonic probe of another liquid immersion type are used to receiving the detection information that carries passed through from lithium ion battery to be detected
Ultrasonic pulsative signal, ultrasonic signal emission receiving unit are also used to the ultrasonic pulsative signal for carrying detection signal received
It converted, quantified and is recorded.
4. a kind of non-destructive testing device for obtaining the distribution of inside lithium ion cell state as claimed in claim 3, feature exist
In the scanning unit includes two linear slide mould groups and probe fixing bracket, and two linear slide mould groups are arranged in a mutually vertical manner, and position
In on y-z plane, each linear slide mould group includes the sliding block of a sliding rail and setting on the slide rail, and sliding block can be along sliding rail phase
To sliding, probe fixing bracket is arranged on sliding block, can move with sliding, liquid immersion type ultrasonic probe is arranged on probe fixing bracket.
5. a kind of non-destructive testing device for obtaining the distribution of inside lithium ion cell state as claimed in claim 4, feature exist
In, have the fixed site of multipair probe on the probe fixing bracket, when experiment at least a pair of of liquid immersion type probe to be fixed on probe holder solid
Determine on frame, is located at mesuring battary two sides, positioned opposite, one end of probe fixing bracket is mutually fixed with sliding block, and the other end protrudes into constant temperature
In the coupling liquid of slot,
Battery each section is detected with realizing by mobile liquid immersion type probe or battery to be detected, so as to obtain in battery
Status information everywhere.
6. a kind of non-destructive testing device for obtaining the distribution of inside lithium ion cell state as claimed in claim 5, feature exist
In the frame auxiliary unit further includes insulating layer, refrigerating module and heating module, and the insulating layer is wrapped in outside thermostat
Wall, with for keeping the temperature, the refrigerating module and the heating module are arranged at thermostat, in use, by controlling cooling mould
The operating status of block and heating module controls the temperature of tank liquid.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820907470.XU CN208297685U (en) | 2018-06-12 | 2018-06-12 | A kind of non-destructive testing device obtaining the distribution of inside lithium ion cell state |
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| CN201820907470.XU CN208297685U (en) | 2018-06-12 | 2018-06-12 | A kind of non-destructive testing device obtaining the distribution of inside lithium ion cell state |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109830761A (en) * | 2019-02-11 | 2019-05-31 | 中兴高能技术有限责任公司 | The method for detecting battery core internal structure |
| CN111257757A (en) * | 2020-03-20 | 2020-06-09 | 天津市捷威动力工业有限公司 | Device and method for detecting dynamic infiltration change of lithium ion soft package battery electrolyte |
| US20210249702A1 (en) * | 2020-02-10 | 2021-08-12 | Titan Advanced Energy Solutions, Inc. | Battery testing systems and methods |
| CN114384149A (en) * | 2021-11-25 | 2022-04-22 | 西安交通大学 | Energy storage device state detection method based on ultrasonic detection technology |
-
2018
- 2018-06-12 CN CN201820907470.XU patent/CN208297685U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109830761A (en) * | 2019-02-11 | 2019-05-31 | 中兴高能技术有限责任公司 | The method for detecting battery core internal structure |
| US20210249702A1 (en) * | 2020-02-10 | 2021-08-12 | Titan Advanced Energy Solutions, Inc. | Battery testing systems and methods |
| US11764413B2 (en) * | 2020-02-10 | 2023-09-19 | Titan Advanced Energy Solutions Inc | Battery testing systems and methods |
| CN111257757A (en) * | 2020-03-20 | 2020-06-09 | 天津市捷威动力工业有限公司 | Device and method for detecting dynamic infiltration change of lithium ion soft package battery electrolyte |
| CN114384149A (en) * | 2021-11-25 | 2022-04-22 | 西安交通大学 | Energy storage device state detection method based on ultrasonic detection technology |
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