CN111257757A - Device and method for detecting dynamic infiltration change of lithium ion soft package battery electrolyte - Google Patents
Device and method for detecting dynamic infiltration change of lithium ion soft package battery electrolyte Download PDFInfo
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- CN111257757A CN111257757A CN202010201222.5A CN202010201222A CN111257757A CN 111257757 A CN111257757 A CN 111257757A CN 202010201222 A CN202010201222 A CN 202010201222A CN 111257757 A CN111257757 A CN 111257757A
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 98
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 98
- 239000003792 electrolyte Substances 0.000 title claims abstract description 50
- 230000008595 infiltration Effects 0.000 title claims abstract description 45
- 238000001764 infiltration Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 42
- 230000008859 change Effects 0.000 title claims abstract description 29
- 238000007600 charging Methods 0.000 claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 claims abstract description 31
- 238000007599 discharging Methods 0.000 claims abstract description 27
- 230000008569 process Effects 0.000 claims abstract description 25
- 238000005096 rolling process Methods 0.000 claims description 84
- 230000006835 compression Effects 0.000 claims description 74
- 238000007906 compression Methods 0.000 claims description 74
- 239000000523 sample Substances 0.000 claims description 69
- 238000001514 detection method Methods 0.000 claims description 39
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- 229910052782 aluminium Inorganic materials 0.000 claims description 12
- 229920000642 polymer Polymers 0.000 claims description 12
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- 241000270722 Crocodylidae Species 0.000 claims description 7
- LNNWVNGFPYWNQE-GMIGKAJZSA-N desomorphine Chemical compound C1C2=CC=C(O)C3=C2[C@]24CCN(C)[C@H]1[C@@H]2CCC[C@@H]4O3 LNNWVNGFPYWNQE-GMIGKAJZSA-N 0.000 claims description 7
- 239000002985 plastic film Substances 0.000 claims description 7
- 229920006255 plastic film Polymers 0.000 claims description 7
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- 241000270728 Alligator Species 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
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- 238000013461 design Methods 0.000 abstract description 7
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- 238000002474 experimental method Methods 0.000 description 5
- 238000007654 immersion Methods 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
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- 230000009471 action Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- 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
- G01N29/02—Analysing fluids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/022—Liquids
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Abstract
The invention provides a device and a method for detecting dynamic infiltration change of electrolyte of a lithium ion soft package battery. According to the invention, whether bubbles exist between the pole piece layers at different moments and at different positions in the battery or not and whether the impregnation of the electrolyte is completed between the pole piece layers at the positions is judged by the strength difference of the repeated penetration and reflection of the ultrasonic waves at different positions, so that adverse effects of cost increase, potential safety hazards, environmental pollution and the like caused by the disassembly of the battery are avoided, the difference of the impregnation rates of different positions in the lithium ion soft package battery can be visually observed through dynamic images, and the change of the impregnation area caused by the gas production at different positions in the charging and discharging process is provided for the subsequent raw material design, battery design and battery manufacturing process.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a device and a method for detecting dynamic infiltration change of electrolyte of a lithium ion soft package battery.
Background
As is well known, electrolyte is one of four main materials of lithium ion batteries. The lithium ion battery is also called as a rocking chair type battery, namely, the process of charging and discharging is achieved by the back and forth movement of lithium ions between a positive electrode and a negative electrode. The medium for the movement of the lithium ions is the electrolyte, and if the electrolyte is not well soaked, the movement of the lithium ions in the battery is inevitably blocked, so that the migration path of the lithium ions is far away, the rate performance is affected, and the internal resistance of the battery is increased. The regions which are not soaked by the electrolyte can form dark regions along with the charging and discharging processes, so that lithium precipitation is generated to influence the capacity exertion, the cycle capacity is rapidly reduced, and even lithium dendrites are caused to pierce the diaphragm to cause safety problems. The lithium precipitation and the dark space can also cause uneven internal stress of the lithium ion soft package battery, and the deformation of the battery can be caused over time. Therefore, the electrolyte infiltration directly influences the electrical property, the safety performance and the like of the lithium ion battery. In addition, for the lithium ion soft package battery, even if the electrolyte after liquid injection and degas is well infiltrated and uniformly distributed, some components in the electrolyte and active substances have the possibility of generating side reactions and continuously generating gas, and the cycle performance, the safety performance and the like of the lithium ion battery can still be influenced by the gas remained between the pole pieces.
At present, the battery disassembly is generally adopted for observing the electrolyte infiltration or gas production condition in the charging and discharging process in the lithium ion soft package battery, the battery disassembly affects the production efficiency and increases the cost, and the scrapped and disassembled pole piece can pollute the environment. In addition, the battery disassembly can only observe the electrolyte infiltration or gas production condition before disassembly, if the conditions of different charge states are observed, a plurality of batteries need to be disassembled in different stages in a batch of batteries, the workload is huge, and the process of electrolyte infiltration change or gas generation cannot be visually observed. Therefore, if the dynamic process of the electrolyte infiltration or the dynamic gas production process in the charging and discharging process can be monitored, the working efficiency can be greatly improved, and the analysis cost can be reduced.
Disclosure of Invention
In view of the above, the present invention aims to provide a device and a method for detecting a dynamic infiltration change of an electrolyte of a lithium ion soft package battery, wherein whether bubbles exist between the pole piece layers at different moments and at different positions in the battery or not and whether the infiltration of the electrolyte is completed between the pole piece layers or not are judged through strength differences of repeated penetration and reflection of ultrasonic waves at the different positions in the battery, so that adverse effects such as cost increase, potential safety hazards and environmental pollution caused by battery disassembly are avoided, and the differences of infiltration rates at different positions in the lithium ion soft package battery and changes of infiltration areas caused by gas production at different positions in a charging and discharging process can be visually observed through dynamic images, thereby providing a basis for subsequent raw material design, battery design and battery manufacturing process.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the device for detecting the dynamic infiltration change of the electrolyte of the lithium ion soft package battery comprises an ultrasonic detection module, wherein the ultrasonic detection module is used for carrying out scanning test on the infiltration of the electrolyte of the battery to be detected;
the transmission module is used for driving the battery to be detected to move, and the battery to be detected is placed and fixed on the transmission module;
the rolling module is used for rolling the battery to be detected, so that the aluminum plastic film of the battery to be detected is completely attached to the core bag;
the charging and discharging module is electrically connected with the battery to be detected and is used for adjusting the charge state of the battery to be detected;
the signal processing module is in signal connection with the ultrasonic detection module through a data line and is used for converting the received signals into numbers and images;
the workstation, the workstation is used for supporting ultrasonic detection module, transmission module and roll and press the module to for detecting provide the place.
Further, the ultrasonic detection module includes many pairs of air coupling ultrasonic transducer, and is every right air coupling ultrasonic transducer includes transmitting probe, receiving probe, transmitting probe is located and waits to examine directly over the battery, and receiving probe is located and waits to examine under the battery.
Further, transmission module includes roller bearing, roller frame and conveyer belt, the roller bearing rotates and installs in both ends about the roller frame, and the roller bearing is by just reversing motor drive, the conveyer belt around locating on the roller bearing and with roller bearing friction connection, be equipped with four clips on the conveyer belt, four the clip is cliied respectively and is waited to examine around the battery, the slide with conveyer belt length direction looks vertically is seted up to the upper surface of workstation, the roller frame slides and locates in the slide, fixed mounting has a actuating mechanism who is used for driving the roller frame along slide round trip movement on the workstation.
Furthermore, the rolling module comprises an upper rolling press roller, a lower rolling press roller and a rolling press roller frame, the front side surface of the workbench is provided with a sliding groove, the rolling roller frame is arranged in the sliding groove in a sliding manner, a second driving mechanism for driving the rolling roller frame to move back and forth along the sliding groove is fixedly arranged on the front side surface of the workbench, the upper rolling compression roller and the lower rolling compression roller are driven by a motor, the upper rolling compression roller and the lower rolling compression roller are respectively arranged on the rolling compression roller frame in a sliding way through an electric telescopic rod which is horizontally arranged, the surfaces of the upper rolling compression roller and the lower rolling compression roller are coated with rubber layers, the upper rolling press roller is positioned above the conveyor belt, the lower rolling press roller is positioned in the space surrounded by the conveyor belt, the diameter of the lower rolling press roller is smaller than that of the roller, roll and be equipped with on the compression roller frame and be used for the drive to roll the electric telescopic handle who rolls the compression roller gliding third actuating mechanism from top to bottom, be used for the drive to roll the electric telescopic handle who rolls the compression roller gliding fourth actuating mechanism from top to bottom down.
Further, charge and discharge module includes charge and discharge appearance, crocodile clamp and utmost point ear connecting bolt, the positive and negative poles of charge and discharge appearance are pressed from both sides through the electric wire and alligator respectively and are linked to each other, the crocodile clamp links to each other with utmost point ear connecting bolt, utmost point ear connecting bolt is connected with the anodal utmost point ear and the negative pole utmost point ear of waiting to examine the battery respectively.
Furthermore, the signal processing module is an ultrasonic signal processor, and the ultrasonic signal processor is respectively in signal connection with the transmitting probe and the receiving probe through data lines.
Further, first actuating mechanism, second actuating mechanism, third actuating mechanism, fourth actuating mechanism are one of cylinder, pneumatic cylinder, electric putter, the device that the high-efficient lithium ion laminate polymer battery electrolyte dynamic infiltration changed that detects still includes computer and PLC control system, the computer links to each other with charging and discharging appearance, ultrasonic signal treater respectively, PLC control system rolls compression roller pivoted motor, drives down to roll compression roller pivoted motor, the drive through current circuit and first actuating mechanism, second actuating mechanism, third actuating mechanism, fourth actuating mechanism, drive roller bearing pivoted just reversal motor, drive and rolls the electric telescopic handle electric connection of compression roller down.
The invention also provides a method for detecting the dynamic infiltration change of the electrolyte of the lithium ion soft package battery, which comprises the following steps:
(1) placing the battery to be detected on a conveyor belt, fixing the battery to be detected to prevent the battery from sliding, and moving the battery to be detected to the positions of an upper rolling roller and a lower rolling roller by the conveyor belt;
(2) the upper rolling roller and the lower rolling roller clamp the battery to be detected, the battery to be detected is rolled for a plurality of times, so that the core bag is completely attached to the aluminum-plastic film, a test result is prevented from being influenced by a gap between the core bag and the aluminum-plastic film, and after rolling, the upper rolling roller and the lower rolling roller or the upper rolling roller and the lower rolling roller are left at the junction of the air bag and the battery main body and move to a detection area along with the battery to be detected or move away from the battery main body slowly and return to an initial position according to detection requirements;
(3) setting scanning parameters in a computer control system according to the actual condition of the battery to be detected, starting scanning, and if gas production detection is required in the charging and discharging process, starting a charging and discharging instrument during scanning to charge and discharge the battery to be detected;
(4) the conveying belt drives the battery to be detected to move left and right and back and forth in the respective working area of each pair of air coupling ultrasonic probes, and the air coupling ultrasonic probes scan the battery to be detected line by line;
(5) after the air coupling ultrasonic probe finishes scanning the working area, splicing the scanning results of the working area of all the air coupling ultrasonic probes to generate a total image of the area to be detected, wherein the total image is an image for scanning one period;
(6) and (5) repeating the steps (3) to (5) to obtain images of a plurality of periods, arranging and combining the scanned images of the plurality of periods into a dynamic image according to the time sequence, wherein the display time of each image can be displayed according to the proportion of the actual scanning time of each image.
Further, in the step (3), the actual conditions of the lithium ion soft package battery include, but are not limited to, the width, length, thickness, appearance flatness, and whether charging and discharging are required during detection of the lithium ion soft package battery.
Further, in step (3), the scanning parameters include, but are not limited to, a working area, a working start position, a working end position, a working path, an ultrasonic emission voltage, an ultrasonic gain, an ultrasonic excitation frequency, and an image output mode of the air-coupled ultrasonic probe.
Compared with the prior art, the invention has at least the following advantages:
(1) the method is convenient to detect, judges whether bubbles exist between the pole piece layers at different moments and at different positions in the battery or not and judges whether the soaking of the electrolyte is completed between the pole piece layers at the positions through ultrasonic attenuation, avoids the adverse effects of cost increase, potential safety hazard, environmental pollution and the like caused by battery disassembly compared with the traditional battery disassembly method, and has the advantages of no damage, quickness and no environmental pollution;
(2) the invention adopts a plurality of pairs of air coupling ultrasonic probes, shortens the working range of each pair of air coupling ultrasonic probes, saves time, and avoids the problem that the working efficiency of the probes at the initial stage of liquid injection or gas production cannot follow the rapid change of infiltration;
(3) the method adopts the methods of fixing the air coupling ultrasonic probe and moving the battery to detect the electrolyte infiltration condition in the battery, so that the test result is prevented from being influenced by instability caused by vibration of the probe in the moving process; in addition, the mode that the conveyor belt drives the batteries to move can be added to a mass production line through simple transformation, namely, the conveyor belt of the detection device is connected with a conveyor belt or a track of the production line, so that the production battery can conveniently pass through the detection device in a running line, and when the detection device is used on the mass production line, a plurality of groups of detection areas can be used for simultaneously detecting a plurality of batteries through simple transformation;
(4) the invention can observe the infiltration result, also can visually observe the dynamic infiltration process and the infiltration rate of different positions of the electrolyte in the lithium ion soft package battery after liquid injection, and can provide a basis for the optimization of the liquid injection process;
(5) the invention can visually observe the gas production voltage of the lithium ion soft package battery in the pre-charging process, and more visually observe the gas production position in the pre-charging process and the voltage of a large amount of gas production by displaying images and the pre-charging voltage, current and time at that moment; in addition, the dynamic image can be combined with a pre-charging curve and a dQ/dV curve to jointly illustrate the gas production voltage, and can provide reference for the subsequent components of the electrolyte, the design and selection of the anode and cathode materials and the pre-charging process;
(6) the invention can visually observe the dynamic process of internal gas generation in the charging and discharging process of the lithium ion soft package battery, can know the specific gas generation starting site, the gas diffusion trend, the cycle number of gas generation starting, the cycle number corresponding to the large consumption of electrolyte and the like of the lithium ion soft package battery in the charging and discharging cycle process, provides a basis for the design optimization and the manufacturing process improvement of the lithium ion soft package battery, and is convenient for the reason analysis of the cycle electrical property degradation of the lithium ion soft package battery.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic diagram of an apparatus for efficiently detecting dynamic infiltration change of electrolyte of a lithium ion soft package battery according to the present invention;
fig. 2 is a schematic structural diagram of a conventional soft-package lithium ion battery with an air bag;
fig. 3 is a schematic structural diagram of another existing soft package lithium ion battery with an air bag;
fig. 4 is a schematic diagram of the working area of each pair of air-coupled ultrasonic probes on a lithium ion soft package battery according to the present invention;
FIG. 5 is a schematic diagram of the scanning path of each pair of air-coupled ultrasonic probes in the working area thereof according to the present invention;
fig. 6 is an image of the electrolyte infiltration condition and gas production condition of the lithium ion soft package battery obtained by the device for efficiently detecting the dynamic infiltration change of the electrolyte of the lithium ion soft package battery in one period, wherein black is an un-infiltrated or gas production area, and white is an infiltrated area;
fig. 7 is an image of the electrolyte infiltration condition and gas production condition of the lithium ion soft package battery obtained by the device for efficiently detecting the dynamic infiltration change of the electrolyte of the lithium ion soft package battery in multiple cycles, wherein black is an un-infiltrated or gas production region, and white is an infiltrated region;
FIG. 8 is a voltage graph of a second embodiment of the present invention;
FIG. 9 is a graph showing the result of the immersion image according to the second embodiment of the present invention;
FIG. 10 is a voltage graph of a third embodiment of the present invention;
FIG. 11 is a graph showing the result of the immersion image according to the third embodiment of the present invention;
FIG. 12 is a graph showing the charging and discharging curves of the fourth embodiment of the present invention;
fig. 13 is a graph showing the result of the immersion image according to the fourth embodiment of the present invention.
Description of reference numerals:
1. a work table; 2. a transmitting probe; 3. receiving a probe; 4. a roller; 5. a roller frame; 6. a conveyor belt; 7. rolling a press roller; 8. rolling down a press roller; 9. rolling a roller frame; 10. an electric telescopic rod; 11. a charge-discharge instrument; 12. an electric wire; 13. an ultrasonic signal processor; 14. a data line; 15. a slideway; 16. a chute; 17. a vertical rod; 18. an upper cross bar; 19. a lower cross bar; 20. a battery to be detected; 21. and (4) a computer.
Detailed Description
Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.
The present invention will be described in detail with reference to the following examples and accompanying drawings.
Example one
Detect device of change is infiltrated in lithium ion laminate polymer battery electrolyte developments, as shown in figure 1, including workstation 1, ultrasonic detection module, transmission module, roll and press the module, charge and discharge module, signal processing module, computer 21, PLC control system, workstation 1.
The ultrasonic detection module is used for carrying out scanning test on the electrolyte infiltration of the battery 20 to be detected; the ultrasonic detection module comprises a plurality of pairs of air coupling ultrasonic probes, the air coupling ultrasonic probes are arranged into m rows and n columns, and each pair of air coupling ultrasonic probes corresponds to one working area. Air coupling ultrasonic probe includes transmitting probe 2, receiving probe 3, transmitting probe 2 is located and waits to examine battery 20 directly over, and receiving probe 3 is located and waits to examine battery 20 directly under. The working mode of the ultrasonic detection module is that the transmitting probe 2 transmits ultrasonic waves, and the ultrasonic waves are attenuated after passing through the lithium ion soft package battery and finally received by the receiving probe 3. It is determined which position has the bubble according to the attenuation of the ultrasonic wave.
Drive module includes roller bearing 4, roller frame 5 and conveyer belt 6, roller bearing 4 rotates and installs in roller frame 5 both ends about, and roller bearing 4 is by motor drive, 6 conveyer belt around locate on roller bearing 4 and with 4 friction connections of roller bearing, be equipped with four clips on the conveyer belt 6, four the clip is cliied respectively and is waited to wait to examine around battery 20, workstation 1's upper surface is seted up with 6 length direction looks vertically slides 15 of conveyer belt, roller frame 5 slides and locates in the slide 15, fixed mounting has the first actuating mechanism (not shown in the figure) that is used for driving roller frame 5 along slide 15 round trip movement on workstation 1. The transmission module is used for driving the battery to move back and forth or left and right to a position where the battery needs to be operated, and the transmission module drives the conveyor belt 6 to move through the back and forth movement of the roller frame 5 and the rolling of the roller 4, so as to drive the battery 20 to be detected to move within a specified range in a plane.
Roll the briquetting and include and roll compression roller 7, roll compression roller 8 down and roll compression roller frame 9, spout 16 has been seted up to the leading flank of workstation 1, roll compression roller frame 9 and slide and locate in the spout 16, the leading flank fixed mounting of workstation 1 is used for the drive to roll compression roller frame 9 along 16 round trip movement's of spout second actuating mechanism (not shown in the figure). Roll compression roller 7 on, roll compression roller 8 down by motor drive, roll compression roller 7 on, roll compression roller 8 down and slide respectively and locate and roll on compression roller frame 9, roll compression roller 7 on and roll the surface cladding that compression roller 8 was rolled down and have a rubber layer (not shown in the figure), prevent to wait to examine battery 20 and pressed badly. On roll compression roller 7 and be located conveyer belt 6's top, roll down compression roller 8 and be located conveyer belt 6 encloses the space and down rolls the diameter that compression roller 8 is less than the diameter of roller bearing 4 rolls compression roller 8 and conveyer belt 6 and does not have the spatial position conflict down promptly. And a third driving mechanism for driving the electric telescopic rod 10 of the upper rolling roller 7 to slide up and down and a fourth driving mechanism (not shown in the figure) for driving the electric telescopic rod 10 of the lower rolling roller 8 to slide up and down are arranged on the rolling roller frame 9. Third actuating mechanism and fourth actuating mechanism adjust and roll compression roller 7 and roll down the position of compression roller 8 in vertical direction to the accurate size of pressing pressure of rolling of pressing between compression roller 8 is rolled in pressing roller 7 and rolling in the accuracy clamp waiting to examine battery 20, adjustment.
Roll the effect of pressing the module and be through rolling compression roller 7, roll compression roller 8 and remove in opposite directions down, clip from top to bottom and wait to examine the direction roll of waiting to examine battery 20 back toward the air pocket simultaneously, this action can be relapse many times to in making the air between core package and the plastic-aluminum membrane catch up with the air pocket, make the plastic-aluminum membrane of waiting to examine battery 20 laminate with the core package completely, avoid the influence test result in space between core package and the plastic-aluminum membrane.
The charge and discharge module includes charge and discharge appearance 11, crocodile clamp and utmost point ear connecting bolt, the positive and negative two poles of the earth of charge and discharge appearance 11 are pressed from both sides with the crocodile through electric wire 12 respectively and are linked to each other, the crocodile presss from both sides and links to each other with utmost point ear connecting bolt, utmost point ear connecting bolt is connected with the positive pole utmost point ear and the negative pole utmost point ear of waiting to examine battery 20 respectively. The charge-discharge module is used for adjusting the charge state of the battery 20 to be detected, performing ultrasonic detection on different charge states of the battery 20 to be detected, and performing ultrasonic detection on the lithium ion soft package battery in the processes of pre-charging, formation and charge-discharge cycle test.
The signal processing module is an ultrasonic signal processor 13, the ultrasonic signal processor 13 is in signal connection with the transmitting probe 2 and the receiving probe 3 through data lines 14 respectively, and the signal processing module is used for converting received signals into numbers and images.
The model of the ultrasonic signal processor 13 is PRACUT-110, the frequency bandwidth of the air coupling ultrasonic transmitting and receiving probe is 50 kHz-10 MHz, the transmitting voltage is 0-1200Vpp, the gain is 100dB, and the controllable gain is-10 dB-30 dB. The model of the charging and discharging instrument 11 is CT3001B/CT3001D or CT6001A/CT 6001B.
The ultrasonic signal processor 13 is connected with the transmitting probe 2 and the receiving probe 3, and the charging and discharging instrument 11 is connected with the positive electrode tab and the negative electrode tab of the battery 20 to be detected by adopting conventional connection, so that the details are not repeated herein for the sake of brevity.
The first driving mechanism, the second driving mechanism, the third driving mechanism and the fourth driving mechanism are one of an air cylinder, a hydraulic cylinder and an electric push rod.
The computer 21 is respectively connected with the charging and discharging instrument 11 and the ultrasonic signal processor 13. The computer 21 gives a program instruction to the ultrasonic signal processor 13, and the ultrasonic signal processor 13 processes the scanning result and feeds back the result to the computer 21 in the form of a number and an image. Moreover, the computer also gives a program instruction to the charge/discharge instrument 11 to charge/discharge the battery 20 to be inspected, and in turn obtains charge/discharge data. PLC control system rolls compression roller 7 pivoted motor, drive down through current circuit and first actuating mechanism, second actuating mechanism, third actuating mechanism, fourth actuating mechanism, 4 pivoted positive and negative motor of drive roller bearing, drive respectively and rolls compression roller 8 pivoted motor, the electric telescopic handle 10 of rolling compression roller 7 on, roll 10 electric connection of electric telescopic handle of compression roller 8 down.
This device can the exclusive use or insert batch production line, and specific working process is as follows:
1. placing the lithium ion soft package battery on the right side of the conveyor belt 6 on the device shown in fig. 1;
2. the conveyer belt 6 drives the lithium ion laminate polymer battery supreme roll compression roller 7 and roll compression roller 8 position department down, rolls compression roller 7 and rolls compression roller 8 down and press from both sides tight lithium ion laminate polymer battery, rolls the pressure to lithium ion laminate polymer battery, rolls pressure and sets for according to the actual conditions of battery, and pressure setting is rolled between 10-50kgF to the general suggestion to make core package and plastic-aluminum membrane well laminate. After rolling, whether the upper rolling compression roller 7 and the lower rolling compression roller 8 are pressed at the junction of the lithium ion soft package battery main body and the air bag (see fig. 2 and fig. 3) or not is determined according to experiment or production requirements, or the upper rolling compression roller 7 and the lower rolling compression roller 8 are separated from the lithium ion soft package battery main body;
3. the conveying belt 6 slowly drives the lithium ion soft package battery to move to the left to the ultrasonic detection area at the speed not more than 0.2m/s, and whether the upper rolling compression roller 7 and the lower rolling compression roller 8 move to the ultrasonic detection area together with the lithium ion soft package battery or remain in the rolling area is determined according to needs;
4. starting the transmitting probe 2, the receiving probe 3 and the ultrasonic signal processor 13, if the influence of the procedures such as pre-charging, formation or charge-discharge cycle test on the battery cell infiltration and gas production is needed, simultaneously opening the charge-discharge instrument 11, setting the charge-discharge process, connecting the charge-discharge instrument 11 with the positive electrode tab and the negative electrode tab of the lithium ion soft package battery by using the wires 12, and starting to charge and discharge the lithium ion soft package battery. The transmission belt 6 drives the lithium ion soft package battery to move repeatedly back and forth and left and right so that each transmitting probe 2 and each receiving probe 3 can repeatedly detect the lithium ion soft package battery in respective working areas, the working area of each pair of air coupling ultrasonic probes on the lithium ion soft package battery is shown in figure 4, the scanning path of each pair of air coupling ultrasonic probes in the working area is shown in figure 5, after one line is scanned, the transmission belt drives the lithium ion soft package battery to the initial position of the next line for scanning the next line, and the moving speed of the transmission belt in the front and back direction and the left and right direction is not more than 0.2 m/s;
5. the detection results of each period are collected by a signal processing module and spliced together to form an image of the overall area of the lithium-ion soft package battery (see fig. 6). The images scanned in each period are combined according to the time sequence (see fig. 7), and the actual time interval or the time interval proportion of every two adjacent images is used as the frame time length basis to integrate the scanned images of each time to form a dynamic image (which can be processed by image-coming software, such as Photoshop), so that the change of the infiltration area and the gas production area can be known.
Example two: post-injection electrolyte wetting process detection
(1) Taking the dried lithium ion soft package dry battery which is not injected with liquid, and waiting for cooling to room temperature;
(2) injecting liquid into the lithium ion soft package dry battery in a glove box drying environment and sealing;
(3) slowly and horizontally moving the lithium ion soft package battery on the conveyor belt 6, fixing the lithium ion soft package battery to prevent the lithium ion soft package battery from sliding, and starting the conveyor belt 6 to move the lithium ion soft package battery to a rolling area;
(4) roll compression roller 7 and roll compression roller 8 down in the start-up, roll compression roller 7 on and move down, roll compression roller 8 down and shift up and carry lithium ion laminate polymer battery, roll lithium ion laminate polymer battery a plurality of times to keep the battery main part level and smooth, make core package and plastic-aluminum membrane laminate completely, avoid space influence test result between core package and the plastic-aluminum membrane. After rolling, the rolling roller is pressed at the junction of the air bag and the battery main body and moves to a detection area along with the battery under the drive of the conveyor belt 6;
(5) setting parameters such as a scanning starting position, a scanning ending position, a scanning working path (see fig. 5), a scanning speed, ultrasonic energy, ultrasonic gain, ultrasonic excitation frequency, a working area of each pair of air coupling ultrasonic probes, a color chart output mode and the like through a computer 21, starting scanning at the moment, and recording the starting time of 0 hour;
(6) all the air coupling ultrasonic probes are fixed, and the conveyor belt 6 drives the battery to be tested to move left and right and back and forth in the working area of each pair of air coupling ultrasonic probes and simultaneously perform line-by-line scanning. After one scanning period is finished, the ultrasonic signal processor 13 immediately splices the images of different working areas of a plurality of pairs of air coupling ultrasonic probes together, records the testing time, stores the scanning image of the period and starts to scan the next period at the same time. The time of scanning in each period is denoted as T, and n periods are scanned in total, so that the total time T of the test is equal to n · T. Or different testing stages can be set according to the change of the infiltration rate along with the time, each stage sets different scanning periods and time per period, namely the testing time of the mth stage is Tm＝nm·tmIf x stages are tested together, the total time for testing is
(7) The scanned images automatically stored in the time T are arranged and combined into a dynamic image according to the time sequence, and the display time of each image can be displayed according to the proportion of the actual scanning time T of each image. For example, the scanning time t of each of the five images is 1s, 2s, 4s, and 8s in sequence, and the display time of each frame of the motion image may be set to 0.1s, 0.2s, 0.4s, 0.8s, 0.05s, 0.1s, 0.2s, 0.4s, 1s, 2s, 4s, and 8 s. And directly observing the change of the electrolyte in the lithium ion soft package battery along with the time according to the time on the dynamic image.
For example, after the injection, the sample is left to stand for 5.5 hours, and the voltage curve is scanned from 0.5h and the image is recorded from 1h as shown in fig. 8. Images were recorded every 0.5h, i.e., x is 1, n is 10, and t is 1800s, and the results of the immersion images are shown in fig. 9. It can be seen from fig. 9 that most of the pole pieces can be soaked after soaking for 5.5 hours after liquid injection. In practical experiments, t can be set to a small value, such as 60s, 120s, 180s, and the like, according to the actual conditions of the wetting rate, the temperature, the cell area, the thickness, and the like.
Example three: pre-charge aerogenesis process detection
(1) Slowly and horizontally moving the lithium ion soft package battery after liquid injection, placing the lithium ion soft package battery on a conveyor belt 6, fixing the lithium ion soft package battery to prevent the lithium ion soft package battery from sliding, and starting the conveyor belt 6 to move the lithium ion soft package battery to a rolling area;
(2) opening the charge and discharge equipment, and respectively connecting the positive electrode and the negative electrode of the charge and discharge equipment with positive and negative electrode tabs of the lithium ion soft package battery;
(3) roll compression roller 7 and roll compression roller 8 down in the start-up, roll compression roller 7 on and move down, roll compression roller 8 down and shift up and carry lithium ion laminate polymer battery, roll lithium ion laminate polymer battery a plurality of times to keep the battery main part level and smooth, make core package and plastic-aluminum membrane laminate completely, avoid space influence test result between core package and the plastic-aluminum membrane. After rolling, the rolling roller slowly moves away from the main body of the lithium ion soft package battery and remains at the initial position of the rolling roller (so that the aluminum-plastic film and the core package can be well jointed and gas flow in the lithium ion soft package battery during gas production is not influenced);
(4) parameters such as a scanning start position, a scanning end position, a scanning work path, a scanning speed, ultrasonic energy, ultrasonic gain, ultrasonic excitation frequency, a work area of each pair of air-coupled ultrasonic probes, a color chart output mode and the like are set by the computer 21, scanning is started at this time, and the start time is recorded for 0 hour. Starting the charging and discharging equipment at the same time, namely starting detection and pre-charging at the same time;
(5) all the air coupling ultrasonic probes are fixed, and the conveyor belt 6 drives the battery to be tested to move left and right and back and forth in the working area of each pair of air coupling ultrasonic probes and simultaneously perform line-by-line scanning. After one scanning period is finished, the ultrasonic signal processor 13 immediately splices the images of different working areas of a plurality of pairs of air coupling ultrasonic probes together, records the testing time, stores the scanning image of the period and starts to scan the next period at the same time. Time of each periodic scanAnd T, scanning n periods in total, and then testing the total time T which is n T. Or different testing stages can be set according to the change of the pre-charging gas production condition along with the time, each stage is set with different scanning period numbers and time of each period, namely the testing time of the mth stage is Tm＝nm·tmIf x stages are tested together, the total time for testing is
T can be set to be the same as the pre-charging time or set according to actual requirements;
(6) the scanned images automatically stored in the time T are sequentially arranged and combined into a dynamic image, and the display time of each image can be displayed according to the proportion of the actual scanning time T of each image. For example, the scanning time t of each of the five images is 1s, 2s, 4s, and 8s in sequence, and the display time of each frame of the motion image may be set to 0.1s, 0.2s, 0.4s, 0.8s, 0.05s, 0.1s, 0.2s, 0.4s, 1s, 2s, 4s, and 8 s. After the dynamic image is derived, the pre-charging curve and the dQ/dV curve can be combined to see the gas production condition or perform other analysis according to the requirement.
For example, after standing after injection, the pre-charge is charged for 3h with a current of 0.1C, and the voltage curve is shown in fig. 10. Scanning is started from 0.5h, and images are recorded from 1 h. Images were recorded every 0.5h, i.e., x is 1, n is 5, and t is 1800s, and the results of the immersion images are shown in fig. 11. It can be seen from fig. 11 that there is significant gassing at the pre-charge to 2h cell body and no gas flows to the gas pocket. In practical experiments, t can be set to a small value, such as 60s, 120s, etc., according to the actual conditions of the electrolyte type, the active material type, etc.
Example four: detection of gas production during charge-discharge cycle
(1) Slowly and horizontally moving the finished lithium ion soft package battery which is subjected to line unloading on a conveyor belt 6, fixing the finished lithium ion soft package battery to prevent the finished lithium ion soft package battery from sliding, and starting the conveyor belt 6 to move the lithium ion soft package battery to a rolling area;
(2) respectively connecting the positive electrode and the negative electrode of the charge and discharge equipment with positive electrode tabs and negative electrode tabs of the lithium ion soft package battery;
(3) roll compression roller 7 and roll compression roller 8 down in the start-up, roll compression roller 7 on and move down, roll compression roller 8 down and shift up and carry lithium ion laminate polymer battery, roll lithium ion laminate polymer battery a plurality of times to keep the battery main part level and smooth, make core package and plastic-aluminum membrane laminate completely, avoid space influence test result between core package and the plastic-aluminum membrane. After rolling, slowly moving the lithium ion soft package battery main body by using the rolling roller, and keeping the lithium ion soft package battery main body at the initial position of the rolling roller;
(4) parameters such as a scanning start position, a scanning end position, a scanning work path, a scanning speed, ultrasonic energy, ultrasonic gain, ultrasonic excitation frequency, a work area of each pair of air-coupled ultrasonic probes, a color chart output mode and the like are set by the computer 21, scanning is started at this time, and the start time is recorded for 0 hour. Simultaneously starting the charging and discharging equipment, namely starting ultrasonic detection and charging and discharging simultaneously;
(5) all the air coupling ultrasonic probes are fixed, and the conveyor belt 6 drives the battery to be tested to move left and right and back and forth in the working area of each pair of air coupling ultrasonic probes and simultaneously perform line-by-line scanning. After one scanning period is finished, the ultrasonic signal processor 13 immediately splices the images of different working areas of a plurality of pairs of air coupling ultrasonic probes together, records the testing time, stores the scanning image of the period and starts to scan the next period at the same time. The time of scanning in each period is denoted as T, and n periods are scanned in total, so that the total time T of the test is equal to n · T. Or different testing stages can be set according to the change of charging, discharging and gas producing conditions along with time, each stage is set with different scanning period numbers and time of each period, namely the testing time of the mth stage is Tm＝nm·tmIf x stages are tested together, the total time for testing is
T can be set to be the same as the charge-discharge cycle time or set according to actual requirements;
(6) the scanned images automatically stored in the time T are arranged and combined into a dynamic image according to the time sequence, and the display time of each image can be displayed according to the proportion of the actual scanning time T of each image. For example, the scanning time t of each of the five images is 1s, 2s, 4s, and 8s in sequence, and the display time of each frame of the motion image may be set to 0.1s, 0.2s, 0.4s, 0.8s, 0.05s, 0.1s, 0.2s, 0.4s, 1s, 2s, 4s, and 8 s. And (3) the dynamic image is derived and then compared with a cycle curve and a charge-discharge curve of each period, and the lithium ion soft package battery is observed when the lithium ion soft package battery starts to generate gas after being cycled, the gas generation site and rate, the electrolyte consumption condition, the relation between the gas generation voltage and the cycle number along with the cycle and the like.
For example, in the course of charge-discharge cycles, 1C charge and 1C discharge were used, and the charge-discharge curves are shown in fig. 12 for 25 cycles in a total charge-discharge cycle. Recording of images began from the end of week 20 (week 20 constant current constant voltage to full power as shown in fig. 12). Images were recorded every 2h59min, and just after the next cycle of charge and discharge, constant current and voltage were applied to full charge, i.e. x is 1, n is 6, and t is 2h59min, and the results of image infiltration are shown in fig. 13. It can be seen from fig. 13 that the problem of infiltration begins from cycle to week 22 and becomes severe at week 23. In practical experiments, the test start time can be determined and set according to the design of the battery, and t is set to a small value, such as 60s, 120s, 180s and the like, so as to observe the gas generation condition in the charging and discharging process in each charging and discharging cycle.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. Detect device of lithium ion laminate polymer battery electrolyte developments infiltration change, its characterized in that:
the device comprises an ultrasonic detection module, a detection module and a control module, wherein the ultrasonic detection module is used for carrying out scanning test on the electrolyte infiltration of the battery to be detected;
the transmission module is used for driving the battery to be detected to move, and the battery to be detected is placed and fixed on the transmission module;
the rolling module is used for rolling the battery to be detected, so that the aluminum plastic film of the battery to be detected is completely attached to the core bag;
the charging and discharging module is electrically connected with the battery to be detected and is used for adjusting the charge state of the battery to be detected;
the signal processing module is in signal connection with the ultrasonic detection module through a data line and is used for converting the received signals into numbers and images;
the workstation, the workstation is used for supporting ultrasonic detection module, transmission module and roll and press the module to for detecting provide the place.
2. The device for detecting the dynamic infiltration change of the electrolyte of the lithium-ion soft package battery according to claim 1, is characterized in that: ultrasonic detection module includes many pairs of air coupling ultrasonic transducer, and is every right air coupling ultrasonic transducer includes transmitting probe, receiving probe, transmitting probe is located and waits to examine directly over the battery, and receiving probe is located and waits to examine under the battery.
3. The device for detecting the dynamic infiltration change of the electrolyte of the lithium-ion soft package battery according to claim 1, is characterized in that: the utility model discloses a battery inspection device, including transmission module, roller bearing, conveyer belt, transmission module includes roller bearing, roller frame and conveyer belt, the roller bearing rotates to be installed in both ends about roller frame, and the roller bearing is by positive reverse motor drive, the conveyer belt around locating on the roller bearing and with roller bearing friction connection, be equipped with four clips on the conveyer belt, four the clip is cliied respectively and is waited to examine around the battery, the slide mutually perpendicular with conveyer belt length direction is seted up to the upper surface of workstation, the roller frame slides and locates in the slide, fixed mounting has a actuating mechanism who is used for driving roller frame along.
4. The device for detecting the dynamic infiltration change of the electrolyte of the lithium-ion soft package battery according to claim 3, is characterized in that: the rolling pressing module comprises an upper rolling pressing roller, a lower rolling pressing roller and a rolling pressing roller frame, the front side surface of the workbench is provided with a sliding groove, the rolling roller frame is arranged in the sliding groove in a sliding manner, a second driving mechanism for driving the rolling roller frame to move back and forth along the sliding groove is fixedly arranged on the front side surface of the workbench, the upper rolling compression roller and the lower rolling compression roller are driven by a motor, the upper rolling compression roller and the lower rolling compression roller are respectively arranged on the rolling compression roller frame in a sliding way through an electric telescopic rod which is horizontally arranged, the surfaces of the upper rolling compression roller and the lower rolling compression roller are coated with rubber layers, the upper rolling press roller is positioned above the conveyor belt, the lower rolling press roller is positioned in the space surrounded by the conveyor belt, the diameter of the lower rolling press roller is smaller than that of the roller, roll and be equipped with on the compression roller frame and be used for the drive to roll the electric telescopic handle who rolls the compression roller gliding third actuating mechanism from top to bottom, be used for the drive to roll the electric telescopic handle who rolls the compression roller gliding fourth actuating mechanism from top to bottom down.
5. The device for detecting the dynamic infiltration change of the electrolyte of the lithium-ion soft package battery according to claim 1, is characterized in that: the charge and discharge module includes charge and discharge appearance, crocodile clamp and utmost point ear connecting bolt, the positive and negative poles of charge and discharge appearance are pressed from both sides through the electric wire and alligator respectively and are linked to each other, the crocodile presss from both sides and links to each other with utmost point ear connecting bolt, utmost point ear connecting bolt is connected with the anodal utmost point ear and the negative pole utmost point ear of waiting to examine the battery respectively.
6. The device for detecting the dynamic infiltration change of the electrolyte of the lithium-ion soft package battery according to claim 2, is characterized in that: the signal processing module is an ultrasonic signal processor, and the ultrasonic signal processor is in signal connection with the transmitting probe and the receiving probe through data lines respectively.
7. The device for detecting the dynamic infiltration change of the electrolyte of the lithium-ion soft package battery according to claim 4, is characterized in that: first actuating mechanism, second actuating mechanism, third actuating mechanism, fourth actuating mechanism are one kind in cylinder, pneumatic cylinder, the electric putter, the device that the high efficiency detected soft packet of lithium ion battery electrolyte developments infiltration and changes still includes computer and PLC control system, the computer links to each other with charge-discharge appearance, ultrasonic signal treater respectively, PLC control system rolls compression roller pivoted motor, drive down through current circuit and first actuating mechanism, second actuating mechanism, third actuating mechanism, fourth actuating mechanism, drive roller bearing pivoted just reversing motor, drive and rolls compression roller pivoted motor, drive down and roll the electric telescopic handle electric connection of compression roller, roll the compression roller down.
8. The method for detecting the dynamic infiltration change of the electrolyte of the lithium ion soft package battery is characterized by comprising the following steps of: the method comprises the following steps:
(1) placing the battery to be detected on a conveyor belt, fixing the battery to be detected to prevent the battery from sliding, and moving the battery to be detected to the positions of an upper rolling roller and a lower rolling roller by the conveyor belt;
(2) the upper rolling roller and the lower rolling roller clamp the battery to be detected, the battery to be detected is rolled for a plurality of times, so that the core bag is completely attached to the aluminum-plastic film, a test result is prevented from being influenced by a gap between the core bag and the aluminum-plastic film, and after rolling, the upper rolling roller and the lower rolling roller or the upper rolling roller and the lower rolling roller are left at the junction of the air bag and the battery main body and move to a detection area along with the battery to be detected or move away from the battery main body slowly and return to an initial position according to detection requirements;
(3) setting scanning parameters in a computer control system according to the actual condition of the battery to be detected, starting scanning, and if gas production detection is required in the charging and discharging process, starting a charging and discharging instrument during scanning to charge and discharge the battery to be detected;
(4) the conveying belt drives the battery to be detected to move left and right and back and forth in the respective working area of each pair of air coupling ultrasonic probes, and the air coupling ultrasonic probes scan the battery to be detected line by line;
(5) after the air coupling ultrasonic probe finishes scanning the working area, splicing the scanning results of the working area of all the air coupling ultrasonic probes to generate a total image of the area to be detected, wherein the total image is an image for scanning one period;
(6) and (5) repeating the steps (3) to (5) to obtain images of a plurality of periods, arranging and combining the scanned images of the plurality of periods into a dynamic image according to the time sequence, wherein the display time of each image can be displayed according to the proportion of the actual scanning time of each image.
9. The method for detecting the dynamic infiltration change of the electrolyte of the lithium-ion soft package battery according to claim 8, wherein the method comprises the following steps: in the step (3), the actual conditions of the lithium ion soft package battery include, but are not limited to, the width, length, thickness, appearance flatness, and whether charging and discharging are required during detection.
10. The method for detecting the dynamic infiltration change of the electrolyte of the lithium-ion soft package battery according to claim 8, wherein the method comprises the following steps: in the step (3), the scanning parameters include, but are not limited to, a working area, a working start position, a working end position, a working path, an ultrasonic emission voltage, an ultrasonic gain, an ultrasonic excitation frequency, and an image output mode of the air-coupled ultrasonic probe.
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