CN112635929A - Method for optimizing standing process after liquid injection of lithium ion battery - Google Patents
Method for optimizing standing process after liquid injection of lithium ion battery Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 77
- 238000002347 injection Methods 0.000 title claims abstract description 43
- 239000007924 injection Substances 0.000 title claims abstract description 43
- 239000007788 liquid Substances 0.000 title claims abstract description 42
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 41
- 230000008569 process Effects 0.000 title claims abstract description 29
- 230000008595 infiltration Effects 0.000 claims abstract description 30
- 238000001764 infiltration Methods 0.000 claims abstract description 30
- 230000000694 effects Effects 0.000 claims abstract description 23
- 238000002834 transmittance Methods 0.000 claims abstract description 9
- 238000005259 measurement Methods 0.000 claims abstract description 3
- 239000003792 electrolyte Substances 0.000 claims description 29
- 230000000284 resting effect Effects 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000005457 optimization Methods 0.000 abstract description 6
- 238000004364 calculation method Methods 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 8
- 238000002791 soaking Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000012827 research and development Methods 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 238000005470 impregnation Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000004506 ultrasonic cleaning Methods 0.000 description 3
- 238000012935 Averaging Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000012983 electrochemical energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
- Filling, Topping-Up Batteries (AREA)
Abstract
The invention provides a method for optimizing a standing process after liquid injection of a lithium ion battery, which comprises the following steps: scanning the fully-infiltrated cell by adopting ultrasonic scanning equipment, selecting scanning points on the fully-infiltrated cell as characteristic points, calculating the ultrasonic transmittance and variance of each characteristic point, selecting other fully-infiltrated cells, and obtaining variance ranges after respective calculation; and selecting batteries which are subjected to standing for different times after liquid injection, obtaining the variance of the ultrasonic transmissivity under different standing times after scanning, and determining the shortest standing time according to the comparison with the previous variance range. According to the invention, the lithium ion battery which is subjected to standing after liquid injection is subjected to ultrasonic scanning, and the infiltration effects under different standing times can be accurately judged through the measurement and calculation of the ultrasonic transmissivity and the fluctuation range thereof, so that the optimal standing process is rapidly determined, and the time required by process optimization is greatly shortened; the method has wide application range, is efficient and simple, and can be popularized to lithium ion batteries of various systems.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and relates to a method for optimizing a standing process of a lithium ion battery after liquid injection.
Background
In recent years, with the rapid development of electric vehicles, electronic devices, and power grid energy storage technologies, the demand for batteries and energy storage systems with high energy density, long service life, and high safety is more and more urgent, wherein lithium ion batteries are the best choice for people due to their advantages of high energy density, long cycle life, and the like. However, compared with energy sources such as gasoline and the like, the energy density of the existing electrochemical energy storage device is still low, so that the research on improving the energy density of the lithium ion battery is more, and along with the improvement of the energy density of the battery, the compaction density of a battery pole piece is also synchronously improved, so that the soaking effect of the electrolyte is influenced.
The impregnation of the electrolyte is mainly realized through a standing process after liquid injection, the process is an important component of the production process of the lithium ion battery, and the electrical property and consistency of the battery can be directly influenced by the quality of the impregnation effect. Based on the important role of electrolyte infiltration, the method of prolonging the infiltration time and increasing the infiltration temperature is usually adopted to ensure the infiltration effect of the whole battery cell at present, the adjustable space for selecting the infiltration temperature is not large, the electrolyte is easy to be damaged due to overhigh temperature, or side reaction occurs, therefore, based on the composition of the battery cell and the electrolyte, the proper standing temperature is selected, the infiltration time is reduced as far as possible, the optimal result is that the whole infiltration effect of the battery cell can not be increased along with the time, and the method with the shortest production time is selected, so the standing time and the infiltration effect need to be accurately grasped.
CN 103721972a discloses an infiltration method of a polymer lithium ion battery, which adopts an ultrasonic cleaning device to perform infiltration, and specifically comprises the following steps: vertically standing the battery air bag after liquid injection in an upward manner in a water tank of an ultrasonic cleaning device; injecting pure water into the water tank, and controlling the liquid level of the pure water to submerge the pole group of the battery; heating the pure water, controlling the temperature at 23-27 ℃, controlling the ultrasonic frequency at 50-70KHz, and carrying out ultrasonic infiltration for 1.0-2.0 hours; and taking out the soaked battery and drying the battery by using a hot air device. The method shortens the infiltration time by using the ultrasonic cleaning device, but does not relate to the judgment of the infiltration effect and cannot optimize the standing technological parameters.
At present, the judgment of the battery cell infiltration effect generally adopts widely set temperature and time levels, and the judgment is carried out by disassembling the battery cell and visually observing the battery cell, but the method is rough and has strong subjectivity and can only be used as a qualitative judgment basis because the electrolyte is volatile; the method also adopts a process method for determining the optimal property by measuring the final electrical property of the battery cell, has extremely long time consumption, occupies more equipment and resources, and is not beneficial to the research and development and the mass production of products. CN110148793A discloses a method for judging the electrolyte infiltration state of a lithium ion battery, which comprises the following steps: preparing a colored impregnating compound, adding the colored impregnating compound into the electrolyte, and uniformly mixing to obtain a colored electrolyte; injecting colored electrolyte into the battery, respectively disassembling the battery when the battery completes primary liquid injection, formation and secondary liquid injection procedures, and judging the infiltration state of the electrolyte according to whether the color areas on the diaphragm and the pole piece are uniformly distributed so as to adjust the primary liquid injection amount, the secondary liquid injection amount and the formation process; the method adopts the colored impregnating compound to add the electrolyte, so that the impregnation degree is more intuitively reflected, but the judgment can be carried out only by disassembling the battery, the time consumption is long, the workload is large, and only qualitative judgment can be carried out.
In summary, for the optimization of the standing process after the battery is injected with the electrolyte, a suitable method needs to be found to quantitatively judge the infiltration effect of the electrolyte, no complex operation and calculation is needed, the precision of the shortest standing time is ensured, and the process optimization research and development time is shortened.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a method for optimizing the process of standing after liquid injection of a lithium ion battery.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a method for optimizing a standing process after liquid injection of a lithium ion battery, which comprises the following steps:
(1) scanning the fully-infiltrated cell by adopting ultrasonic scanning equipment, selecting scanning points on the fully-infiltrated cell as characteristic points, and calculating the ultrasonic transmissivity of each characteristic point;
(2) calculating the variance of the ultrasonic transmissivity of each characteristic point in the step (1), selecting other fully-infiltrated cells, and calculating the variance of the ultrasonic transmissivity respectively to obtain the variance range of the ultrasonic transmissivity;
(3) and (3) selecting batteries which are subjected to standing for different times after liquid injection, scanning the battery cores according to the operations in the steps (1) and (2), obtaining the variance of the ultrasonic transmissivity under different standing times, and determining the shortest standing time according to the comparison of each variance and the range of the variance in the step (2).
According to the invention, the quality of the infiltration effect after the liquid injection of the lithium ion battery is an important factor influencing the performance of the battery, so that the judgment of the infiltration effect is particularly important.
The following technical solutions are preferred technical solutions of the present invention, but not limited to the technical solutions provided by the present invention, and technical objects and advantageous effects of the present invention can be better achieved and achieved by the following technical solutions.
As a preferred technical scheme of the present invention, the step (1) of fully infiltrating the battery cell is: and standing for a long enough time after liquid injection to fully achieve the electrolyte soaking effect.
Preferably, the sufficient period of time is 7 days or more, for example, 7 days, 8 days, 9 days, 10 days, etc., but is not limited to the recited values, and other values not recited within the range of values are also applicable.
In the invention, the standing time of the lithium ion battery after liquid injection is long enough to ensure the electrolyte to infiltrate the whole battery cell, and the battery cell in the state is defined as a fully infiltrated battery cell, namely the infiltration effect of the electrolyte on the whole battery cell in the process cannot be exceeded no matter how the optimization process is carried out.
As a preferable technical solution of the present invention, the ultrasonic scanning device in step (1) scans the fully soaked battery, and the scanning path passes through the battery cell.
Preferably, the scanning path is selected along the longitudinal direction of the battery, and a plurality of scanning paths are arranged in parallel.
In the invention, after the battery is assembled, the battery core is positioned in the battery, so that the ultrasonic scanning equipment scans the battery, the path is selected according to the position of the battery core, the scanning path passes through the battery core, the ultrasonic signal can be transmitted from one side to the other side, and the transmission signal values can be different according to the infiltration degree of the electrolyte.
In the invention, the structure of the ultrasonic scanning equipment mainly comprises an ultrasonic probe, a transmitting/receiving unit and a digital converter; the ultrasonic signal characteristic value can be expressed by sound intensity I, which means sound energy passing through a unit area perpendicular to a propagation direction in unit time, and the unit is W/m2。
Preferably, the scanning points in step (1) are uniformly selected on the scanning path.
Preferably, the scanning points on the same scanning path have the same interval, so that the uniformity of data detection and collection is facilitated.
As a preferred technical scheme of the present invention, the ultrasonic transmittance in step (1) is a ratio of a characteristic value of an ultrasonic signal after the ultrasonic signal passes through the electrical core and before the ultrasonic signal enters the electrical core.
Preferably, when the ultrasonic wave is transmitted, the ultrasonic signal enters the battery from the characteristic point, vertically passes through the battery cell and exits from the other side.
As a preferred technical solution of the present invention, the selection of other fully-infiltrated cells in step (2) is the same as that of the fully-infiltrated cells in step (1).
In the invention, the selection of a plurality of fully infiltrated cells needs to meet the requirements of the same types of cells, namely the same size and material of the cells, the same type of electrolyte and the same operation process parameters, such as the injection amount and the standing time, so that the infiltration effects of different fully infiltrated cells are basically the same, and the effect of reducing errors is achieved.
As a preferable technical scheme of the invention, the batteries after liquid injection in the step (3) are selected into different groups according to different standing temperatures, and the shortest standing time at each standing temperature is independently determined.
Preferably, the selection of the standing temperature is determined according to the battery core and the electrolyte type.
Preferably, the selection of resting temperatures is in an arithmetic progression over the range of resting temperatures.
As a preferred technical scheme of the invention, the selection of different standing times under the same standing temperature in the step (3) is arranged in an arithmetic progression.
Preferably, the ultrasonic transmittance of the characteristic point on the battery at each standing time is measured, and the variance value thereof is calculated.
Preferably, at least 3 cells are arranged at the same standing temperature and the same standing time, for example, 3 cells, 4 cells, 5 cells, 6 cells, 8 cells or 10 cells are arranged at the same standing temperature and the same standing time, and the mean variance value of the area with concentrated variance is selected to be compared with the variance range in the step (2).
In the invention, a plurality of battery cells are selected in the same standing time, and the purpose is mainly to confirm the numerical value with concentrated variance as a judgment basis, so that the problem that the deviation is large due to abnormal injection amount and the like when only a single battery cell is selected is avoided.
Preferably, the ultrasonic transmittance is measured sequentially from small to large, and the corresponding standing time when the variance value of the measurement reaches the variance range of the step (2) for the first time is the shortest standing time at the standing temperature.
As a preferred technical solution of the present invention, if the tolerance value in the arrangement of the standing times with equal difference is large, the battery cells with different standing times are set with equal difference between the shortest standing time determined in step (3) and the previous standing time, so as to further accurately obtain the shortest standing time.
As the preferred technical scheme of the invention, the optimal standing process condition is selected by combining the shortest standing time at different standing temperatures.
As a preferred technical scheme of the invention, the method comprises the following steps:
(1) scanning a fully-infiltrated battery cell by adopting ultrasonic scanning equipment, wherein the fully-infiltrated battery cell is: standing the battery cell after liquid injection for a sufficient time to fully achieve an electrolyte infiltration effect, wherein the sufficient time is more than 7 days, the ultrasonic scanning equipment scans the battery which is fully infiltrated, a scanning path passes through the battery cell, the scanning path is selected along the longitudinal direction of the battery, a plurality of scanning paths are arranged in parallel, scanning points on the fully infiltrated battery cell are selected as characteristic points, the scanning points are uniformly selected on the scanning path, the ultrasonic transmissivity of each characteristic point is calculated, the ultrasonic transmissivity is the ratio of the characteristic value of an ultrasonic signal after the ultrasonic signal passes through the battery cell to the characteristic value of the ultrasonic signal before the ultrasonic signal enters the battery cell, and during ultrasonic transmission, the ultrasonic signal enters the battery from the characteristic points and vertically passes through the battery cell and passes out from the other side;
(2) calculating the variance of the ultrasonic transmissivity of each characteristic point in the step (1), selecting other fully-infiltrated cells, wherein the selection of the other fully-infiltrated cells is the same as that of the fully-infiltrated cells in the step (1), and calculating the variance of the ultrasonic transmissivity respectively to obtain the variance range of the ultrasonic transmissivity;
(3) selecting batteries which are subjected to standing for different times after liquid injection, wherein the batteries after liquid injection are selected to be divided into different groups according to different standing temperatures, the shortest standing time at each standing temperature is independently determined, the selection of the standing temperature is determined according to the types of the battery core and the electrolyte, and the selection of the standing temperature is arranged in an arithmetic progression within the range of the standing temperature;
selecting different standing times at the same standing temperature in an arithmetic progression arrangement, scanning the battery core according to the operations of the steps (1) and (2), measuring the ultrasonic transmissivity of the characteristic point on the battery at each standing time, calculating the variance value, measuring the ultrasonic transmissivity in the sequence from small to large from the standing time, and determining the corresponding standing time when the measured variance value reaches the variance range of the step (2) for the first time as the shortest standing time at the standing temperature; and selecting the optimal standing process condition by combining the shortest standing time at different standing temperatures.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the method, the lithium ion battery which is subjected to standing after liquid injection is subjected to ultrasonic scanning, and the infiltration effects at different temperatures and different standing times can be accurately judged by measuring and calculating the ultrasonic transmissivity and the fluctuation range thereof, so that the optimal standing process is quickly determined, the research and development time required by process optimization is greatly shortened, and the reduction range can reach more than 50%;
(2) the method can judge the infiltration effect without disassembling the battery, thereby not only reducing the operation steps and saving the time, but also avoiding the electrolyte loss easily caused after disassembly;
(3) the method has wide application range, is efficient and simple, and can be popularized to lithium ion batteries of various systems.
Detailed Description
In order to better illustrate the present invention and facilitate the understanding of the technical solutions of the present invention, the present invention is further described in detail below. However, the following examples are only simple examples of the present invention and do not represent or limit the scope of the present invention, which is defined by the claims.
The specific embodiment of the invention partially provides a method for optimizing a standing process after liquid injection of a lithium ion battery, which comprises the following steps:
(1) scanning the fully-infiltrated cell by adopting ultrasonic scanning equipment, selecting scanning points on the fully-infiltrated cell as characteristic points, and calculating the ultrasonic transmissivity of each characteristic point;
(2) calculating the variance of the ultrasonic transmissivity of each characteristic point in the step (1), selecting other fully-infiltrated cells, and calculating the variance of the ultrasonic transmissivity respectively to obtain the variance range of the ultrasonic transmissivity;
(3) and (3) selecting batteries which are subjected to standing for different times after liquid injection, scanning the battery cores according to the operations in the steps (1) and (2), obtaining the variance of the ultrasonic transmissivity under different standing times, and determining the shortest standing time according to the comparison of each variance and the range of the variance in the step (2).
The following are typical but non-limiting examples of the invention:
example 1:
the embodiment provides a method for optimizing a standing process after liquid injection of a lithium ion battery, wherein the lithium ion battery is a square lithium ion battery;
the method comprises the following steps:
(1) scanning a fully-infiltrated battery cell by adopting ultrasonic scanning equipment, wherein the standing time of the fully-infiltrated battery cell is 7 days, scanning paths pass through the battery cell of the battery and are distributed in parallel, 9 scanning points are selected from the scanning paths as characteristic points, the scanning points are uniformly distributed on the scanning paths, ultrasonic signals enter the battery from the characteristic points and vertically penetrate through the battery cell and penetrate out from the other side when the ultrasonic signals are transmitted, the ultrasonic scanning equipment displays the sound intensity values of the ultrasonic signals before and after the ultrasonic signals enter and exit the battery cell, and the ultrasonic transmissivity and the variance of each ultrasonic transmissivity are calculated;
(2) selecting other 5 fully soaked battery cores with the same structure and material, the same liquid injection amount and the same standing time as those in the step (1), and calculating the variance of the ultrasonic transmissivity to obtain the variance range of the ultrasonic transmissivity;
(3) selecting the lithium ion batteries which are subjected to liquid injection and are the same as the lithium ion batteries in the step (1), respectively soaking for 8h, 12h, 16h and the like at the normal temperature of 20 ℃, taking 4h as an equal difference to 48h, setting 11 batteries, setting 5 batteries which are the same at each soaking time, respectively detecting and calculating the variance of the ultrasonic transmissivity at different standing times according to the step (1), selecting variance values without obvious deviation from the variance values at the same standing time, averaging the variance values to be used as the variance values at the standing time, and measuring the corresponding standing time when the variance values first reach the variance range in the step (2) according to the sequence of the standing time from small to large, namely the shortest standing time at the standing temperature.
Example 2:
the embodiment provides a method for optimizing a standing process after liquid injection of a lithium ion battery, which comprises the steps of referring to the method in the embodiment 1, and the difference is only that: adjusting the standing temperature in the step (3), respectively selecting 40 ℃, 60 ℃, 80 ℃ and 100 ℃, and calculating the shortest standing time at the respective standing temperature.
According to the lithium ion batteries selected in the embodiments 1 and 2, the optimal standing process conditions of the lithium ion batteries are selected according to the reference data of the lithium ion batteries which fully infiltrate the battery cells and by combining the shortest standing time at different standing temperatures.
Example 3:
the embodiment provides a method for optimizing a standing process after liquid injection of a lithium ion battery, wherein the lithium ion battery is a square lithium ion battery, and the material of a battery core and the type of electrolyte are different from those of the lithium ion battery in the embodiment 1;
the method comprises the following steps:
(1) scanning a fully-infiltrated battery cell by adopting ultrasonic scanning equipment, wherein the standing time of the fully-infiltrated battery cell is 10 days, scanning paths pass through the battery cell of the battery and are distributed in parallel, 6 scanning points are selected from the scanning paths as characteristic points, the scanning points are uniformly distributed on the scanning paths, ultrasonic signals enter the battery from the characteristic points and vertically penetrate through the battery cell and penetrate out from the other side when the ultrasonic signals are transmitted, the ultrasonic scanning equipment displays the sound intensity values of the ultrasonic signals before and after the ultrasonic signals enter and exit the battery cell, and the ultrasonic transmissivity and the variance of each ultrasonic transmissivity are calculated;
(2) selecting other 3 fully soaked battery cores with the same structure and material, the same liquid injection amount and the same standing time as those in the step (1), and calculating the variance of the ultrasonic transmissivity to obtain the variance range of the ultrasonic transmissivity;
(3) selecting the lithium ion batteries which are subjected to liquid injection and are the same as the lithium ion batteries in the step (1), respectively soaking for 8h, 10h, 12h and the like at the normal temperature of 20 ℃, taking 2h as an equal difference to 48h, setting 21 batteries, setting 3 batteries which are the same at each soaking time, respectively detecting and calculating the variance of the ultrasonic transmissivity at different standing times according to the step (1), selecting variance values without obvious deviation from the variance values at the same standing time, averaging the variance values to be used as the variance values at the standing time, and measuring the corresponding standing time when the variance values first reach the variance range in the step (2) according to the sequence of the standing time from small to large, namely the shortest standing time at the standing temperature.
Example 4:
the embodiment provides a method for optimizing a standing process after liquid injection of a lithium ion battery, which comprises the steps of referring to the method in the embodiment 3, and the difference is only that: adjusting the standing temperature in the step (3), respectively selecting 30 ℃, 40 ℃, 50 ℃, 60 ℃ and 70 ℃, and calculating the shortest standing time at the respective standing temperature.
According to the lithium ion batteries selected in the embodiments 3 and 4, the reference data of the lithium ion batteries which fully infiltrate the battery cores are correspondingly obtained, and the optimal standing process conditions of the lithium ion batteries are selected by combining the shortest standing time at different standing temperatures.
By integrating the above embodiments, the method of the present invention can accurately judge the infiltration effect at different temperatures and different standing times by performing ultrasonic scanning on the lithium ion battery standing after liquid injection and by measuring and calculating the ultrasonic transmittance and the fluctuation range thereof, thereby quickly determining the optimal standing process, greatly reducing the research and development time required by process optimization, and reducing the amplitude by more than 50%; the method can judge the infiltration effect without disassembling the battery, thereby not only reducing the operation steps and saving the time, but also avoiding the electrolyte loss easily caused after disassembly; the method has wide application range, is efficient and simple, and can be popularized to lithium ion batteries of various systems.
The applicant states that the present invention is illustrated in detail by the above examples, but the present invention is not limited to the above detailed methods, i.e. it is not meant that the present invention must rely on the above detailed methods for its implementation. It will be apparent to those skilled in the art that any modifications to the present invention, equivalents of the method of the present invention and additions of ancillary steps, selection of specific means, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. A method for optimizing a standing process after liquid injection of a lithium ion battery is characterized by comprising the following steps:
(1) scanning the fully-infiltrated cell by adopting ultrasonic scanning equipment, selecting scanning points on the fully-infiltrated cell as characteristic points, and calculating the ultrasonic transmissivity of each characteristic point;
(2) calculating the variance of the ultrasonic transmissivity of each characteristic point in the step (1), selecting other fully-infiltrated cells, and calculating the variance of the ultrasonic transmissivity respectively to obtain the variance range of the ultrasonic transmissivity;
(3) and (3) selecting batteries which are subjected to standing for different times after liquid injection, scanning the battery cores according to the operations in the steps (1) and (2), obtaining the variance of the ultrasonic transmissivity under different standing times, and determining the shortest standing time according to the comparison of each variance and the range of the variance in the step (2).
2. The method of claim 1, wherein the fully infiltrated cell of step (1) is: the battery core is kept stand for a long enough time after liquid injection to fully achieve the electrolyte infiltration effect;
preferably, the sufficient period of time is 7 days or more.
3. The method of claim 1 or 2, wherein the ultrasonic scanning device of step (1) scans the fully soaked battery, and the scanning path passes through the battery cell;
preferably, the scanning path is selected along the longitudinal direction of the battery, and a plurality of scanning paths are arranged in parallel;
preferably, the scanning points of step (1) are uniformly selected on the scanning path;
preferably, the scanning points on the same scanning path have the same pitch.
4. The method of any one of claims 1-3, wherein the ultrasonic transmittance of step (1) is a ratio of a characteristic value of the ultrasonic signal after passing through the cell and before entering the cell;
preferably, when the ultrasonic wave is transmitted, the ultrasonic signal enters the battery from the characteristic point, vertically passes through the battery cell and exits from the other side.
5. The method of any one of claims 1-4, wherein the selection of other fully infiltrated cells in step (2) is the same as the fully infiltrated cells in step (1).
6. The method according to any one of claims 1 to 5, wherein the batteries after the liquid injection in the step (3) are selected into different groups according to different standing temperatures, and the shortest standing time at each standing temperature is independently determined;
preferably, the selection of the standing temperature is determined according to the types of the battery cell and the electrolyte;
preferably, the selection of resting temperatures is in an arithmetic progression over the range of resting temperatures.
7. The method according to any one of claims 1 to 6, wherein the selection of different resting times at the same resting temperature in step (3) is in an arithmetic progression;
preferably, the ultrasonic transmittance of the characteristic points on the battery at each standing time is measured, and the variance value of the ultrasonic transmittance is calculated;
preferably, at least 3 battery cells are arranged at the same standing temperature and in the same standing time, and the mean variance value of the area with concentrated variance is selected to be compared with the variance range in the step (2);
preferably, the ultrasonic transmittance is measured sequentially from small to large, and the corresponding standing time when the variance value of the measurement reaches the variance range of the step (2) for the first time is the shortest standing time at the standing temperature.
8. The method of claim 7, wherein if the tolerance value in the arrangement of the standing times with equal difference is larger, the battery cells with different standing times are set with equal difference between the shortest standing time determined in the step (3) and the previous standing time, so as to further accurately obtain the shortest standing time.
9. The method according to claim 7 or 8, characterized in that the optimal resting process conditions are selected in combination with the shortest resting time at different resting temperatures.
10. Method according to any of claims 1-9, characterized in that the method comprises the steps of:
(1) scanning a fully-infiltrated battery cell by adopting ultrasonic scanning equipment, wherein the fully-infiltrated battery cell is: standing the battery cell after liquid injection for a sufficient time to fully achieve an electrolyte infiltration effect, wherein the sufficient time is more than 7 days, the ultrasonic scanning equipment scans the battery which is fully infiltrated, a scanning path passes through the battery cell, the scanning path is selected along the longitudinal direction of the battery, a plurality of scanning paths are arranged in parallel, scanning points on the fully infiltrated battery cell are selected as characteristic points, the scanning points are uniformly selected on the scanning path, the ultrasonic transmissivity of each characteristic point is calculated, the ultrasonic transmissivity is the ratio of the characteristic value of an ultrasonic signal after the ultrasonic signal passes through the battery cell to the characteristic value of the ultrasonic signal before the ultrasonic signal enters the battery cell, and during ultrasonic transmission, the ultrasonic signal enters the battery from the characteristic points and vertically passes through the battery cell and passes out from the other side;
(2) calculating the variance of the ultrasonic transmissivity of each characteristic point in the step (1), selecting other fully-infiltrated cells, wherein the selection of the other fully-infiltrated cells is the same as that of the fully-infiltrated cells in the step (1), and calculating the variance of the ultrasonic transmissivity respectively to obtain the variance range of the ultrasonic transmissivity;
(3) selecting batteries which are subjected to standing for different times after liquid injection, wherein the batteries after liquid injection are selected to be divided into different groups according to different standing temperatures, the shortest standing time at each standing temperature is independently determined, the selection of the standing temperature is determined according to the types of the battery core and the electrolyte, and the selection of the standing temperature is arranged in an arithmetic progression within the range of the standing temperature;
selecting different standing times at the same standing temperature in an arithmetic progression arrangement, scanning the battery core according to the operations of the steps (1) and (2), measuring the ultrasonic transmissivity of the characteristic point on the battery at each standing time, calculating the variance value, measuring the ultrasonic transmissivity in the sequence from small to large from the standing time, and determining the corresponding standing time when the measured variance value reaches the variance range of the step (2) for the first time as the shortest standing time at the standing temperature; and selecting the optimal standing process condition by combining the shortest standing time at different standing temperatures.
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