CN115060581A - Method for evaluating soft package packaging effect of battery cell - Google Patents
Method for evaluating soft package packaging effect of battery cell Download PDFInfo
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- CN115060581A CN115060581A CN202210888675.9A CN202210888675A CN115060581A CN 115060581 A CN115060581 A CN 115060581A CN 202210888675 A CN202210888675 A CN 202210888675A CN 115060581 A CN115060581 A CN 115060581A
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- 230000000694 effects Effects 0.000 title claims abstract description 47
- 238000004806 packaging method and process Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000012360 testing method Methods 0.000 claims abstract description 62
- 238000011156 evaluation Methods 0.000 claims abstract description 8
- 239000003792 electrolyte Substances 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 10
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 238000002360 preparation method Methods 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 239000002985 plastic film Substances 0.000 description 6
- 229920006255 plastic film Polymers 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000007872 degassing Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 238000009516 primary packaging Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000009517 secondary packaging Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/24—Devices for determining the value of power, e.g. by measuring and simultaneously multiplying the values of torque and revolutions per unit of time, by multiplying the values of tractive or propulsive force and velocity
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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
- H01M10/058—Construction or manufacture
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/105—Pouches or flexible bags
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- General Chemical & Material Sciences (AREA)
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Abstract
The invention provides an evaluation method for the soft package packaging effect of a battery cell, wherein a soft package is a shell sleeved on the battery cell, and the evaluation method comprises the following steps: s1, preparing a sample, S2, testing, stretching the shell by adopting a tensile machine, S3, and recording peak tensile force f max S4, for the test from the beginning to f max And solving the total work P done at the moment, wherein the obtained P is equal to the total energy required by the package tearing at the position, and the larger the P is, the better the package effect at the test position is. The total power required by package damage replaces the maximum pulling force required by package damage to evaluate the package effect, and the method is closer to the scene of package in practical application.
Description
Technical Field
The invention relates to the technical field of power batteries, in particular to a method for evaluating a soft package packaging effect of a battery core.
Background
In recent years, the upgrading speed of electronic products is faster and faster, and especially, the service life of consumer electronic products such as mobile phones and notebook computers is gradually shortened, so that the demand for the used soft package lithium battery is also greater and greater. At present, most of soft package lithium batteries are packaged by adopting an aluminum plastic film, and the aluminum plastic film mainly comprises a nylon layer, an aluminum layer and a PP layer. When the positive and negative pole pieces are transferred from the sheet making area to the assembling area, the positive and negative pole pieces and the isolating film jointly form a battery core package, the core package and the lugs are welded and then placed in an aluminum plastic film for primary packaging, then electrolyte is injected, degassing and secondary packaging are carried out after pre-charging, degassing can take away generated gas and part of electrolyte, but the liquid retention amount during design is guaranteed, and the final battery appearance size relates to various sizes such as thickness, pit punching, seal width and thickness. The PP layers of the two aluminum-plastic films are packaged into a whole by melting, sealing and certain strength are required, and the quality and the service life of the battery are directly influenced by the effect of the PP layers.
With the function iterative upgrade of electronic products, the corresponding product requirements are higher and higher, and the requirements for falling are higher and higher no matter the latest mobile phone or new applications of VR and AR. The standard for the battery drop test was adjusted from 0.5m to 1m, 1.2m, 1.5m and even 2 m. The main failure modes of the falling are top seal failure and side seal failure, further liquid leakage can be caused, and short circuit and fire can be caused seriously.
The packaging effect of the soft package battery is mainly to test the packaging tension at present so as to evaluate the packaging effect according to the size of the packaging tension. The package punching is mainly fatigue cracking of a package area, and the tensile test is to obtain the maximum instantaneous package cracking, so that the package effect cannot be accurately evaluated.
The conventional tensile test is to prepare a sample after the soft-packaged battery cell is placed into a shell. At the moment, electrolyte is not injected, the package is in a dry state, and the package effect cannot be completely expressed by the tension test at the moment, which is different from the performance in practical application.
In view of this, it is necessary to provide a novel soft package effect evaluation method to meet the above application scenario.
Disclosure of Invention
The invention aims to provide a method for evaluating the soft package packaging effect of a battery cell, which can accurately evaluate the packaging effect.
In order to achieve the above purpose, the invention provides the following technical scheme:
a method for evaluating the soft package packaging effect of a battery cell is characterized in that a soft package is a shell sleeved on the battery cell, and the evaluation method comprises the following steps: s1, preparing a sample, S2, testing, stretching the shell by using a tensile machine, S3, and recording peak tensile force f max S4, for the test from the start to f max The total work P done at that moment is solved.
Further, in the above method for evaluating a soft package effect of a battery cell, the step S1 includes: and S11, preparing a battery cell sample, and S12, preparing a sample.
Further, in the above method for evaluating a soft package effect of a battery cell, the step S11 includes: the electric core sample preparation refers to standing the electric core and the shell after liquid injection for a first period of time in a high-temperature environment to simulate the state of the electric core after formation is completed, preferably, the temperature of the high-temperature environment is 60-80 ℃, and the first period of time is 12-48 hours.
Further, in the above method for evaluating a soft package effect of a battery cell, the step S12 includes: s121, selecting a plurality of test units on the surface of the shell, S122, cutting the shell and reserving a complete top seal, S123, taking out the battery cell, S124, standing the sample after the completion of the steps S121-S123 for a second period of time, preferably 4-6 hours, and entering the next step after the electrolyte is completely volatilized; the testing unit comprises an A surface and a B surface, the A surface and the B surface are connected through the top seal, the A surface is located on one side surface of the shell, and the B surface is located on one side surface opposite to the A surface.
Further, in the method for evaluating the soft package effect of the electrical core, in S121, a total of 5 test units are selected, and the 5 test units respectively correspond to the positive electrode tab area, the negative electrode tab area, the middle electrode tab area, the area beside the positive electrode tab, and the area beside the negative electrode tab.
Further, in the above method for evaluating soft package effect of a battery cell, in S122, the test units located in the positive electrode tab region and the negative electrode tab region cut short tabs from the inside of the top seal.
Further, in the method for evaluating the soft package effect of the battery cell, the length of the surface A and the length of the surface B in the test unit are both 5-10 cm, and the width of the surface A is 6 mm.
Further, in the method for evaluating the soft package effect of the battery core, the widths of the test units located in the positive electrode tab area and the negative electrode tab area are consistent with the width of the electrode tab.
Further, in the method for evaluating the soft package effect of the battery cell, in the step S2, the housing is stretched by using a high-speed rail tensile machine, the sample is unfolded first, then the two ends of the sample are fixed by using the clamps, the contact length of each clamp and one end of the sample is 5 cm-8 cm, and preferably, the contact length of each clamp and one end of the sample is 5 cm.
Further, in the above method for evaluating soft package effect of battery cell, step S4 includes stretching the casing at a constant speed, and measuring the peak tension f max Variation of distance D between two ends of time-measuring unit Become For the test from start to f max And solving the total work P done at the moment, wherein the obtained P is equal to the total energy required by the package tearing at the position, and the larger the P is, the better the package effect at the test position is.
The analysis shows that the invention discloses a method for evaluating the soft package packaging effect of a battery cell, which evaluates the packaging effect by replacing the maximum pulling force required by package damage with the total power required by package damage, and is closer to the scene of package in practical application; the battery core sample preparation by high-temperature standing after liquid injection is used for replacing the battery core sample preparation before liquid injection, so that the influence of the electrolyte on the packaging effect is fully evaluated; the packaging strength of the tab and the non-tab can be more fully evaluated through multi-position sampling evaluation; and the energy required by the whole tension period is evaluated by power, so that the sample is prevented from being missed to be killed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. Wherein:
FIG. 1 is a schematic structural diagram of a test cell before being divided according to an embodiment of the invention.
Fig. 2 is a schematic structural diagram of a test unit after being divided according to an embodiment of the invention.
Fig. 3 is a schematic front view of a test unit.
FIG. 4 is a side view of the testing unit.
FIG. 5 is a schematic view of the structure of the test unit after the two ends are clamped by the clamp.
Description of reference numerals: 1. an electric core; 2. a housing; 3. a test unit; 31. surface A; 32. surface B4, top seal 5, positive tab; 6. a negative tab; 7. the clamping device is used for clamping the workpiece,
D beginning of the design Initial distance between two ends of the test cell, D Become The distance between the two ends of the test unit varies.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. The various examples are provided by way of explanation of the invention, and not limitation of the invention. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit thereof. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present invention encompass such modifications and variations as fall within the scope of the appended claims and equivalents thereof.
In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are for convenience of description of the present invention only and do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected," "connected," and "disposed" as used herein are intended to be broadly construed, and may include, for example, fixed connections and removable connections; can be directly connected or indirectly connected through intermediate components; the connection may be a wired electrical connection, a wireless electrical connection, or a wireless communication signal connection, and a person skilled in the art can understand the specific meaning of the above terms according to specific situations.
One or more examples of the invention are illustrated in the accompanying drawings. The detailed description uses numerical and letter designations to refer to features in the drawings. Like or similar designations in the drawings and description have been used to refer to like or similar parts of the invention. As used herein, the terms "first," "second," and "third," etc. may be used interchangeably to distinguish one component from another, and are not intended to denote the position or importance of the individual components.
As shown in fig. 1 to fig. 5, according to the embodiment of the present invention, a method for evaluating a soft package packaging effect of a battery cell is provided, where the soft package is a casing 2 sleeved on the battery cell 1, and the casing 2 may be an aluminum-plastic film.
The evaluation method comprises the following steps:
s1, preparing a sample, wherein the step S1 comprises the following steps: s11, preparing a sample by the battery cell 1, and S12 preparing a sample by the sample.
Wherein, S11 electricity core system appearance includes:
the electric core sample preparation refers to standing the electric core 1 and the shell 2 after liquid injection for a first period of time in a high-temperature environment to simulate the state of the electric core 1 after formation is completed, preferably, the temperature of the high-temperature environment is 60-80 ℃, and the first period of time is 12-48 hours.
And preparing a sample by using the battery cell 1 which is subjected to high-temperature standing after liquid injection so as to simulate the state of the battery cell 1 after formation. The battery cell 1 does not need to be actually formed, so the battery cell is uncharged and can be stood at a high temperature. The high-temperature standing condition is most preferable at 60-80 ℃, and the standing is most preferable for 48 hours, so that the electrolyte can be conveniently and fully infiltrated. The high temperature is selected to be between 60 ℃ and 80 ℃, so that the infiltration of the electrolyte is accelerated, the battery core 1 is aged, gas is fully generated, and the internal environment of the battery core 1 is closer to the actual use state.
The S12 sample preparation comprises the following steps:
s121, selecting a plurality of test units 3 on the surface of the shell 2,
in S121, 5 test units 3 are selected, and the 5 test units 3 respectively correspond to the positive electrode tab 5 region, the negative electrode tab 6 region, the tab middle region, the region near the positive electrode tab 5, and the region near the negative electrode tab 6.
The test cell 3, which is located in the region of the positive tab 5 and in the region of the negative tab 6, cuts short the tabs from the inside of the top seal 4.
The length of the A surface 31 and the B surface 32 in the test unit 3 are both 5-10 cm, and the width is 6 mm. The above-mentioned size design of test unit 3 is in order to standardize utmost point ear width, guarantees that each test unit 3's width is unanimous, and the electric core 1 of different designs can be suitable for. The length of the a-side 31 or the B-side 32 refers to the dimension of the test unit 33 in the vertical direction as shown in fig. 3, and the length refers to the dimension of the test unit 33 in the lateral direction as shown in fig. 3.
The width of the test cell 3 in the region of the positive tab 5 and the negative tab 6 corresponds to the width of the tabs. If the tab width is small, taking the tab width as a main reference, for example, the tab width is 2mm, the width of the test unit 3 located in the region of the positive tab 5 and the negative tab 6 is 2 mm.
And S122, cutting the shell 2 and reserving the complete top seal 4, wherein the cutting direction is to cut the aluminum-plastic film from the side of the main body of the electric core 1 and reserve the integrity of the top seal 4.
S123, taking out the battery cell 1,
s124, standing the sample after the completion of the steps S121-S123 for a second period of time.
In the above steps, the order of S122 and S122 may be interchanged, that is, S122 may be performed first, and then S121 may be performed.
Preferably, the second period of time is 4-6 hours, and the next step is carried out after the electrolyte is completely volatilized; in order to ensure that the test equipment is firmly contacted with the sample in the test process, the completed sample needs to be kept stand for 4-6 hours until the electrolyte is completely volatilized, and then the further test can be carried out.
The test unit 3 includes an a-side 31 and a B-side 32, the a-side 31 and the B-side 32 are connected by a top seal 4, the a-side 31 is located on one side surface of the housing 2, and the B-side 32 is located on the opposite side surface of the a-side 31.
S2, test, stretching the housing 2 with a tensile machine,
in step S2, the housing 2 is stretched using a high-iron tensile machine,
the sample is firstly unfolded, then two ends of the sample are fixed by using the clamps 7, the contact length of each clamp 7 and one end of the sample is 5 cm-8 cm, and preferably, the contact length of each clamp 7 and one end of the sample is 5 cm. The contact length of the clamp 7 and the sample is less than that of the test unit 3, and the contact length of the clamp 7 and the sample is more than or equal to 5cm, so that insufficient clamping force can be avoided, and a test result is ensured.
And a high-speed rail tensile machine is selected for measurement. The method comprises the steps of firstly unfolding the surface A31 and the surface B32 of a test unit 3, fixing two ends of a sample by using a clamp 7 of a tensile machine, wherein the width of a contact area of the clamp 7 and the sample is the width of the sample, the length of the contact area is between 5 and 8cm, 5cm is the most preferable length, and the length of the contact area is slightly longer so as to facilitate the tensile machine to clamp the sample during testing.
Measuring the initial distance D between the two ends of the test unit 3 before the start of the test Beginning of the design 。
S3, stretching the shell 2 at a constant speed, and recording the peak tension f max Measuring the peak tension f max The distance between both ends of the time measuring unit 3 changes D Become 。
S4, for f from the start of the test max The total work P done at the moment is solved, the obtained P is equal to the total energy required by package tearing at the position, and the larger the P is, the better the package effect at the test position is, namely the better the package effect at the corresponding test unit 3 position is.
The total work P is solved using the following integral formula,
The two variables are respectively the tension and the change D in the distance between the two ends of the test unit 3 Become 。
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
the packaging effect of the soft package battery is tested by the total work P of the shell 2, and the packaging effect can be accurately evaluated. The total power required by package damage replaces the maximum tensile force required by package damage to evaluate the package effect, and the method is closer to the scene of package in practical application; the battery cell 1 sample preparation after liquid injection and high-temperature standing is used for replacing the battery cell 1 sample preparation before liquid injection, so that the influence of the electrolyte on the packaging effect is fully evaluated; the packaging strength of the tab and the non-tab can be more fully evaluated through multi-position sampling evaluation; and the energy required by the whole tension period is evaluated by power, so that the sample is prevented from being missed to be killed.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The method for evaluating the soft package packaging effect of the battery cell is characterized in that the soft package is a shell sleeved on the battery cell, and the evaluation method comprises the following steps:
s1, preparing a sample,
s2, testing, stretching the shell by using a tensile machine,
s3, recording the peak tension f max ，
S4, for f from the start of the test max The total work P done at that moment is solved.
2. The method for evaluating the soft package packaging effect of the battery core according to claim 1,
the step S1 includes:
s11, preparing a battery cell sample,
and S12, preparing a sample.
3. The method for evaluating the soft package packaging effect of the battery core according to claim 2, wherein the step S11 includes:
the cell sample preparation refers to standing the cell and the shell after liquid injection for a first period of time in a high-temperature environment to simulate the state of the cell after formation is completed,
preferably, the temperature of the high-temperature environment is 60-80 ℃, and the first period of time is 12-48 hours.
4. The method for evaluating the soft package packaging effect of the battery core according to claim 2,
the step S12 includes:
s121, selecting a plurality of test units on the surface of the shell,
s122, cutting the shell and reserving a complete top seal,
s123, taking out the battery cell,
s124, standing the sample after the completion of the steps S121 to S123 for a second period of time,
preferably, the second period of time is 4-6 hours, and the next step is carried out after the electrolyte is completely volatilized;
the test unit comprises an A surface and a B surface, the A surface and the B surface are connected through the top seal,
the surface A is positioned on one side surface of the shell, and the surface B is positioned on the surface opposite to the surface A.
5. The method for evaluating the soft package packaging effect of the battery core according to claim 4,
in S121, 5 test units are selected, and the 5 test units respectively correspond to the positive electrode tab region, the negative electrode tab region, the tab middle region, the positive electrode tab side region, and the negative electrode tab side region.
6. The method for evaluating the soft package packaging effect of the battery core according to claim 5,
in S122, the test unit located in the positive electrode tab region and the negative electrode tab region cuts short the tab from the inside of the top seal.
7. The method for evaluating the soft package packaging effect of the battery core according to claim 4,
the length of the surface A and the surface B in the test unit is 5-10 cm, and the width of the surface A and the surface B is 6 mm.
8. The method for evaluating the soft package packaging effect of the battery core according to claim 5,
the width of the test unit positioned in the positive electrode lug area and the negative electrode lug area is consistent with the width of the electrode lug.
9. The method for evaluating the soft package packaging effect of the battery core according to claim 1,
in the step S2, the shell is stretched using a high-iron tensile machine,
firstly, unfolding a sample, fixing two ends of the sample by using clamps, wherein the contact length of each clamp and one end of the sample is 5 cm-8 cm,
preferably, each clamp has a contact length of 5cm with one end of the sample.
10. The method for evaluating the soft package packaging effect of the battery core according to claim 1,
step S4 includes stretching the shell at a constant rate and measuring the peak pull force f max Variation of distance D between two ends of time-measuring unit Become ，
For the test from the beginning to f max What is done at any momentThe obtained P is equal to the total energy required by tearing the package, and the larger the P is, the better the packaging effect at the test position is.
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