CN113834758A - Method and device for testing battery core pole group wetting performance - Google Patents
Method and device for testing battery core pole group wetting performance Download PDFInfo
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- CN113834758A CN113834758A CN202111107026.2A CN202111107026A CN113834758A CN 113834758 A CN113834758 A CN 113834758A CN 202111107026 A CN202111107026 A CN 202111107026A CN 113834758 A CN113834758 A CN 113834758A
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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Abstract
The invention provides a method and a device for testing the wetting performance of a battery cell pole group. In the test method for the infiltration performance of the battery cell pole group, the battery cell pole group is placed under the condition of the simulated extrusion working condition of the set pretightening force K, the electrolyte is dripped into the battery cell pole group from the upper part of the battery cell pole group at a constant flow rate, and the time T1 when the dripping is started is recorded; observing the time when the electrolyte flows out of the bottom of the battery cell pole group, and recording the time as T2; and taking the difference value of T2 and T1 as the outflow time delta T to represent the wetting performance of the cell pole group under the pretightening force K. According to the test method for the wetting performance of the battery cell pole group, the battery cell pole group is subjected to the dropping test of the electrolyte at a uniform flow rate by giving a set pretightening force to the battery cell pole group; the outflow time delta T for representing the electrolyte infiltration capacity of the battery cell pole group can be measured; by setting uniform pretightening force and dropping flow rate, the infiltration performance of the battery cell pole group with the same size and specification can be tested.
Description
Technical Field
The invention relates to the technical field of battery performance testing, in particular to a testing method for the wetting performance of a battery core electrode group. In addition, the invention also relates to a testing device.
Background
Lithium ion battery receives the space restriction in the module in the use, at the in-process of charging and discharging, because factors such as self inflation, can make electric core utmost point group bear the extrusion force.
In the charging process of the battery, the positive electrode has a shrinkage phenomenon due to the extraction of Li; meanwhile, part of electrolyte is extruded out, and free electrolyte in the battery is replenished to the interior of the battery. Li extracted from the positive electrode is embedded into the negative electrode, so that the negative electrode plate rapidly expands (the expansion rate is approximately equal to 25%); with the insertion of Li, the distance between the anode and the cathode is increased, the porosity is increased, and at the moment, the electrolyte needs to be supplemented to ensure good wettability of the anode and the cathode particles.
Along with repeated charging and discharging of the battery, the positive and negative pole pieces are continuously contracted and expanded, and the electrolyte is continuously consumed by reaction, so that the infiltration effect of the pole pieces is poor, and the stress of the battery core is more serious due to the expansion effect of the negative pole. Particularly, the situation of stressed extrusion is more obvious at the central position of the pole piece; easily cause the pole piece center to appear unusually. Fig. 1 in the attached drawings of the specification shows a pole piece after 800 times of charge-discharge cycles at normal temperature, wherein the abnormal condition of the middle part under pressure is obviously reflected in the appearance.
The analysis shows that the battery core electrode group stressed in the battery has a great influence on the wettability of the electrolyte, and the wettability of the battery core electrode group plays a key role in the charge and discharge performance and the cycle life of the battery. Therefore, it is necessary to grasp the wettability of the cell electrode group by means of measurement, testing, and the like.
Disclosure of Invention
In view of this, the present invention is directed to a method for testing the wetting performance of a battery cell electrode set, so as to provide a parameter standard for characterizing the wetting electrolyte performance of the battery cell electrode set and a testing method thereof.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a test method of the wetting performance of a battery core pole group is characterized in that the battery core pole group is placed under the condition of a simulated extrusion working condition with a set pretightening force K, electrolyte is dripped into the battery core pole group from the upper part of the battery core pole group at a constant flow rate, and the time T1 when the dripping is started is recorded; observing the time of the electrolyte flowing out of the bottom of the cell pole group, and recording the time as T2; and taking the difference value of T2 and T1 as the outflow time delta T to represent the wetting performance of the cell pole group under the pretightening force K.
Further, the tabs of the cell electrode group are placed upwards, and pretightening force K is given to the cell electrode group from the front side and the rear side of the cell electrode group in the lamination direction of the electrode sheets of the cell electrode group.
Furthermore, the pretension force K is measured by a pressure sensor.
Further, the electrolyte is dripped by adopting a dripping pipe with a set pipe diameter, and the dripping frequency of the liquid drops is adjusted to be constant.
Further, the method also comprises the following steps: respectively testing a plurality of groups of the battery cell pole groups with the same specification under different pretightening forces K to obtain corresponding outflow time Delta T, wherein the electrolyte adopts the same flow speed in the test of each battery cell pole group; a graph is drawn with K as the X coordinate and DeltaT as the Y coordinate.
Further, five groups of battery cell pole groups of the same specification are respectively tested, and corresponding pretightening force K starts from 0N and is valued at intervals of 800-1400N.
Compared with the prior art, the invention has the following advantages:
according to the test method for the infiltration performance of the battery cell pole group, the battery cell pole group is under a simulated extrusion working condition by giving a set pretightening force to the battery cell pole group; then, carrying out an electrolyte dripping test on the battery core electrode group at a uniform flow rate; the electrolyte is dripped from the top of the battery core pole group to be measured, and the outflow time delta T can be measured until the electrolyte flows out from the bottom of the battery core pole group; the outflow time delta T can indicate the size of the battery cell pole group which receives the electrolyte soakage capacity, so that the soakage performance of the battery cell pole group with the same size and specification can be tested by setting uniform pretightening force and dropping flow speed.
Meanwhile, the pre-tightening force for extruding the battery core pole group is given to the battery core pole group from the front side and the rear side of the battery core pole group in the pole piece laminating direction of the battery core pole group and is consistent with the extrusion stress condition born by expansion under the working condition of the battery core pole group, the extrusion stress condition caused by expansion under the working condition of the battery core pole group can be simulated, the technology is convenient to implement, and the extrusion pressure degree given to the battery core pole group can be flexibly adjusted.
In addition, adopt the dropping liquid pipe to instil into electrolyte, test same batch of electric core utmost point group of the same kind of dimensions through the dropping liquid pipe that adopts same pipe diameter, the dropping frequency of accessible adjustment dropping liquid pipe liquid drop conveniently controls the velocity of flow that electrolyte instiled into to the velocity of flow uniformity that each electric core utmost point group instiled into electrolyte of guarantee.
The invention also provides a testing device, which is based on the testing method for the wetting performance of the cell pole group, and comprises an extrusion platform for simulating the extrusion working condition of the cell pole group and a liquid dropping device arranged above the extrusion platform.
Furthermore, two pressing plates with adjustable intervals are arranged on the extrusion platform, and the two pressing plates are used for forming full coverage on the front side and the rear side of the battery cell pole group.
Further, the dropping device comprises a bracket, a container hung on the bracket and a dropping pipe communicated with the container; electrolyte in the container can follow because of gravity the bottom of dropping liquid pipe flows, just be equipped with on the dropping liquid pipe and be used for adjusting the regulator of electrolyte outflow speed.
Furthermore, a dropping funnel is arranged on the dropping liquid pipe.
The testing device provided by the invention is based on the testing method provided by the invention, the wetting performance of the battery cell pole group can be well tested by configuring the extrusion platform and the liquid dropping device, and the action performance of the positive and negative pole pieces with the electrolyte in the charging and discharging processes can be known by mastering and comparing the wetting performance conditions of the battery cell pole group, so that the use performance, the service life and other conditions of the battery cell pole group can be evaluated conveniently.
Meanwhile, the dropping of the electrolyte is realized by the aid of gravity in the form of a suspended container and an inserted dropping liquid pipe, and the flow rate can be adjusted by an adjuster on the dropping liquid pipe; such setting is convenient for observe and control the velocity of flow, possesses the technique of being convenient for and realizes and be suitable for advantages such as test requirement.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, illustrate embodiments of the invention and together with the description serve to explain the invention, and the description is given by way of example only and without limitation to the terms of relative positions. In the drawings:
FIG. 1 is a state diagram of a pole piece according to the background art of the present invention;
fig. 2 is a graph of electrolyte outflow time Δ T varying with pretightening force K obtained by the method for testing the wetting performance of a battery cell pole group according to the present invention in the first embodiment of the present invention;
fig. 3 is a schematic view of an overall structure of a device for testing the wetting performance of a battery cell pole group according to a second embodiment of the present invention;
description of reference numerals:
1. a battery cell pole group; 2. an electrolyte; 30. a support; 300. a container; 301. a dropping tube; 302. an air inlet pipe; 303. a dropping funnel; 304. a regulator.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it should be noted that, if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "back", etc. appear, they are based on the orientation or positional relationship shown in the drawings and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In addition, in the description of the present invention, the terms "mounted," "connected," and "connecting" are to be construed broadly unless otherwise specifically limited. For example, the connection may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through both elements. To those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in conjunction with specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example one
The invention relates to a method for testing the wetting performance of a battery cell pole group, and provides a parameter standard for representing the wetting electrolyte performance of the battery cell pole group and a method step for testing and obtaining the parameter standard.
Overall, in the method for testing the wetting performance of the battery cell pole group, firstly, the battery cell pole group is placed under the condition of the simulated extrusion working condition with the set pretightening force K. Thereafter, the electrolyte was dropped into the cell pole group from above the cell pole group at a constant flow rate, and the time T1 at which the dropping started was recorded. Thereafter, the time at which the electrolyte flowed out of the bottom of the cell electrode group was observed and recorded as T2. Finally, the difference between T2 and T1 is used as the outflow time Δ T to characterize the wetting performance of the cell pole group under the pre-tightening force K.
Based on the above overall testing concept, the present embodiment further specifically describes the testing method for the wettability of the cell electrode group.
The electrolyte dripping into the battery core pole group can be absorbed quickly when the pole pieces in the battery core pole group have good wetting performance, so that the electrolyte can pass through a slurry layer on a pole piece current collector more smoothly, and the time of flowing out of the battery core pole group is shorter; therefore, the outflow time Δ T can characterize the wetting performance of the cell pole group. When the outflow time delta T is larger, the battery cell pole group has poorer wetting performance; on the contrary, when the outflow time Δ T is smaller, the wettability of the surface cell electrode group is better.
Meanwhile, in the test method, the cell pole group is carried out under the set pretightening force K, and compared with the traditional method that only the influence of the compaction size of the pole piece on the wettability of the pole piece is considered, the parameters of the overall wettability of the cell evaluated by the method can more accurately reflect the real wettability of the cell pole group.
In this embodiment, the cell electrode group that is not filled with the electrolyte is placed on the extrusion platform, and the tab of the cell electrode group faces upward. Through the distance between the regulation clamp plate, do benefit to two clamp plates, from electric core utmost point group's front and back both sides centre gripping electric core utmost point group to give electric core utmost point group with pretightning force K. In order to ensure that the battery cell pole group is subjected to balanced clamping force, the pressing plate can completely cover the side surface of the battery cell pole group, so that the whole surface of the battery cell pole group is subjected to stress, and the extrusion stress condition caused by expansion of the battery cell pole group under the working condition is simulated. The above arrangement scheme is convenient for technical implementation, and can flexibly adjust the extrusion pressure degree given to the battery core pole group.
Meanwhile, the magnitude of the pretightening force K is preferably measured by adopting a pressure sensor. The pre-tightening force K for extruding the battery cell pole group is measured through the pressure sensor, the size of the pre-tightening force K can be accurately measured, and the condition and the numerical value of extruding the battery cell pole group in the test can be accurately controlled and recorded. After reaching the pre-tightening force K that sets for, can dismantle pressure sensor to the instiling of subsequent electrolyte is dripped into in the convenience.
In the operation of instiling into of electrolyte, the preferred drip tube that adopts the settlement pipe diameter of electrolyte instils into, and at this moment, should insert the bottom drip mouth of drip tube between two adjacent pole pieces in the electric core utmost point group to insert the electric core utmost point is organized completely with the drip mouth. Then, the drop frequency of the droplets is adjusted to be constant to maintain a constant flow rate of the electrolyte. Adopt the dropping liquid pipe to instil into electrolyte, test same batch of electric core utmost point group of the same kind size specification through the dropping liquid pipe that adopts same pipe diameter, the dropping frequency of accessible adjustment dropping liquid pipe liquid drop conveniently controls the velocity of flow that electrolyte instiled into to the velocity of flow uniformity that each electric core utmost point group instiled into electrolyte is ensured.
In order to better master the change situation of the time delta T of the cell pole group under different pretightening forces K. In this embodiment, a plurality of sets of cell electrode groups of the same specification are respectively tested under different pretightening forces K, so as to obtain a plurality of corresponding outflow times Δ T. Meanwhile, in the test of each cell pole group, the electrolyte adopts the same flow rate, so that the influence on the test result due to the change of the flow rate of the electrolyte is avoided.
And (4) testing two groups of obtained data, namely data of the pretightening force K and the outflow time delta T, and drawing a curve chart by taking K as an X coordinate and delta T as a Y coordinate. Therefore, by respectively testing a plurality of groups of battery cell pole groups of the same specification under different pretightening force conditions, a curve of delta T-K can be obtained, and the variation trend of the wetting performance of the battery cell pole groups influenced by the pretightening force can be known.
Based on the steps of the method, five groups of battery cell pole groups with the same specification can be selected for testing respectively, and the corresponding pretightening force K starts from 0N and is valued at intervals of 800-1400N for taking five pretightening force K values; five outflow time Δ T values are correspondingly measured. The testing is carried out by adopting 5 groups of different pretightening forces K, the numerical intervals between the adjacent K are 800-1400N, and the stress range of the battery cell pole group extruded under the working condition can be basically covered, so that the change curve of delta T of the battery cell pole group in the pretightening force range is drawn, and the overall change condition of the infiltration performance of the battery cell pole group is known.
By combining the above method steps, a specific test is performed to further illustrate the specific contents of the test method of this embodiment.
Firstly, 5 groups of cell electrode groups in the same batch are taken and respectively placed in a steel plate clamp, the interval of an initial clamp is adjusted by utilizing a pressure sensor, and initial pre-tightening forces with different sizes are respectively applied to the cell electrode groups, and are recorded as K, and the unit is N (cattle); and removing the pressure sensor after the distance is fixed. In the meantime, the pretightening force K is 0N, 1050N, 2150N, 3200N and 4500N respectively.
Then, putting the electrolyte or the solvent into a solvent bottle, and hanging the solvent or the electrolyte in a bracket in an inverted manner; placing dust removal paper on the lower side of the battery cell pole group, and recording the starting time T1 when the electrolyte flows out of the hose and begins to drop into the battery cell and the time T2 when the electrolyte flows out of the bottom of the battery cell pole group by using a stopwatch; the time difference between T2 and T1 is the outflow time Δ T, which is T2-T1. And respectively calculating the outflow time delta T of each group of the battery cell pole groups, wherein the unit is s (second).
And then, processing data and analyzing the polar group wettability under different pressures (pretightening force K). The data obtained statistically are as follows:
by using the data in the table above, a curve of the liquid outflow time Δ T of the batch of cell electrode groups with the same specification along with the variation of the pretightening force K can be drawn, as shown in fig. 2.
It should be noted that, this method is generally used for performing a comparison test on a plurality of cell pole groups of the same model size, and if the comparison between the cell pole groups of different sizes is involved, normalization processing needs to be performed on the distance through which the electrolyte flows (i.e. adjusting the size distance through which the electrolyte flows to be consistent, or adjusting the flow rate of the electrolyte according to the relationship of the size and the size according to the difference of the size distance).
In summary, in the method for testing the wetting performance of the battery cell pole group of the embodiment, the battery cell pole group is under a simulated extrusion working condition by giving a set pre-tightening force to the battery cell pole group; then, carrying out an electrolyte dripping test on the battery core electrode group at a uniform flow rate; the electrolyte is dripped from the top of the battery core pole group to be measured, and the outflow time delta T can be measured until the electrolyte flows out from the bottom of the battery core pole group; the outflow time delta T can indicate the size of the battery cell pole group which receives the electrolyte soakage capacity, so that the soakage performance of the battery cell pole group with the same size and specification can be tested by setting uniform pretightening force and dropping flow speed.
Example two
The invention relates to a testing device for the wettability of a cell electrode group, which is arranged based on a testing method for the wettability of the cell electrode group provided by the embodiment one, and an exemplary structure of the testing device is shown in fig. 3, and mainly comprises an extrusion platform for simulating the extrusion working condition of a cell electrode group 1 and a liquid dropping device arranged above the extrusion platform.
Wherein, be equipped with two clamp plates of interval adjustable on the extrusion platform, electric core utmost point group 1 can be fixed to two clamp plates, and through the adjustment, can change two clamp plates and give the extrusion power degree of electric core utmost point group 1. Adopt the clamp plate form, realize the adjustment of clamp plate centre gripping dynamics through direction, locking isotructure, have simple structure, the structure of being convenient for etc. advantage can simulate the operating mode pressurized condition of electric core utmost point group 1 well.
There are many alternative arrangements of the dripping device, and in this embodiment, as shown in fig. 3, the dripping device includes a support 30, a container 300 suspended from the support 30, and a dripping tube 301 communicating with the container 300. The electrolyte 2 in the container 300 can flow out from the bottom end of the dropping pipe 301 due to gravity, and thus drops onto the cell pole group 1. The dropping pipe 301 is provided with an adjuster 304 for adjusting the flow rate of the electrolyte 2.
The dropping of the electrolyte 2 is realized by gravity in the form of a suspension container 300 and a plug-in dropping tube 301, and the flow rate can be adjusted by an adjuster 304 on the dropping tube 301; such setting is convenient for observe and control the velocity of flow, possesses the technique of being convenient for and realizes and be suitable for advantages such as test requirement.
It should be noted that, when the container 300 is a closed bottle, the air inlet pipe 302 should be inserted into the container 300 to keep the air pressure inside and outside the container 300 consistent, thereby ensuring the smooth dropping of the electrolyte 2.
Further, a drip chamber 303 is preferably additionally provided to the drip pipe 301. By providing the dropping funnel 303 on the dropping pipe 301, the dropping frequency can be observed more favorably, and bubbles can be prevented from being mixed into the dropping electrolyte 2. The above arrangement can refer to or directly adopt the infusion form of a transfusion bottle.
Based on the testing method, the wetting performance of the battery cell pole group 1 can be well tested by configuring the extrusion platform and the liquid dropping device, and the action performance of the positive and negative pole pieces with the electrolyte in the charging and discharging processes can be known by mastering and comparing the wetting performance conditions of the battery cell pole group 1, so that the service performance, the service life and other conditions of the battery cell pole group 1 can be evaluated conveniently.
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. A method for testing the wetting performance of a battery core electrode group is characterized by comprising the following steps:
in the method, an electric core pole group (1) is placed under the condition of a simulated extrusion working condition with a set pretightening force K, electrolyte (2) is dripped into the electric core pole group (1) from the upper part of the electric core pole group (1) at a constant flow rate, and the time T1 of the start of dripping is recorded;
observing the time when the electrolyte (2) flows out from the bottom of the battery cell pole group (1), and recording the time as T2;
the difference between T2 and T1 is used as the outflow time DeltaT to characterize the wetting performance of the cell pole group (1) under the pretightening force K.
2. The method for testing the wetting property of the battery cell pole group according to claim 1, wherein:
the battery cell pole group is characterized in that the pole lugs of the battery cell pole group (1) are placed upwards, and pre-tightening force K is given to the battery cell pole group (1) from the front side and the rear side of the battery cell pole group (1) in the pole piece laminating direction of the battery cell pole group (1).
3. The method for testing the wetting property of the battery core pack according to claim 2, wherein:
the pre-tightening force K is measured by a pressure sensor.
4. The method for testing the wetting property of the battery cell pole group according to claim 1, wherein:
electrolyte (2) adopt dropping liquid pipe (301) of setting for the pipe diameter to drip into, and the frequency adjustment of dripping of liquid drop is invariable.
5. The method for testing the wetting performance of the battery cell pole group according to any one of claims 1 to 4, further comprising:
respectively testing a plurality of groups of the battery cell pole groups (1) with the same specification under different pretightening forces K to obtain corresponding outflow time Delta T, wherein the electrolyte (2) adopts the same flow speed in the test of each battery cell pole group (1);
a graph is drawn with K as the X coordinate and DeltaT as the Y coordinate.
6. The method for testing the wetting property of the battery core pack according to claim 5, wherein:
and (3) testing five groups of the battery cell pole groups (1) with the same specification respectively, wherein the corresponding pretightening force K starts from 0N and is valued at intervals of 800-1400N.
7. A testing device, which is characterized in that the testing device is based on the testing method setting for the immersion performance of the cell pole group of any one of claims 1 to 6, and comprises an extrusion platform for simulating the extrusion working condition of the cell pole group (1) and a liquid dropping device arranged above the extrusion platform.
8. The test device of claim 7, wherein:
the extrusion platform is provided with two pressing plates with adjustable intervals, and the two pressing plates respectively face the front side and the rear side of the battery cell pole group (1) to form full coverage.
9. The test device of claim 7, wherein:
the dropping device comprises a bracket (30), a container (300) hung on the bracket (30), and a dropping pipe (301) communicated with the container (300);
electrolyte (2) in the container (300) can flow out from the bottom end of the dropping liquid pipe (301) due to gravity, and a regulator (304) used for regulating the flowing speed of the electrolyte (2) is arranged on the dropping liquid pipe (301).
10. The test device of claim 7, wherein:
a dropping funnel (303) is arranged on the dropping liquid pipe (301).
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| CN202111107026.2A CN113834758A (en) | 2021-09-22 | 2021-09-22 | Method and device for testing battery core pole group wetting performance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115856658A (en) * | 2022-12-13 | 2023-03-28 | 蜂巢能源科技(马鞍山)有限公司 | Battery infiltration time detection method and device, electronic equipment and storage medium |
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| CN112461714A (en) * | 2020-10-22 | 2021-03-09 | 惠州锂威电子科技有限公司 | Method for detecting infiltration rate of battery coating |
| CN113075094A (en) * | 2021-03-31 | 2021-07-06 | 宁德卓高新材料科技有限公司 | Diaphragm wettability testing device and testing method thereof |
| CN113218806A (en) * | 2021-05-20 | 2021-08-06 | 苏州领湃新能源科技有限公司 | Method and device for testing imbibition rate |
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| CN115856658A (en) * | 2022-12-13 | 2023-03-28 | 蜂巢能源科技(马鞍山)有限公司 | Battery infiltration time detection method and device, electronic equipment and storage medium |
| CN115856658B (en) * | 2022-12-13 | 2024-04-19 | 蜂巢能源科技(马鞍山)有限公司 | Battery soaking time detection method and device, electronic equipment and storage medium |
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Application publication date: 20211224 |