CN113218806A - Method and device for testing imbibition rate - Google Patents
Method and device for testing imbibition rate Download PDFInfo
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- CN113218806A CN113218806A CN202110554494.8A CN202110554494A CN113218806A CN 113218806 A CN113218806 A CN 113218806A CN 202110554494 A CN202110554494 A CN 202110554494A CN 113218806 A CN113218806 A CN 113218806A
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- battery cell
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/02—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
Abstract
The invention discloses a method for testing liquid suction rate, belongs to the technical field of a cell measurement method, and solves the technical problem that the theoretical liquid injection amount of a battery and the standing aging time of the battery cannot be estimated due to the fact that the method in the prior art cannot accurately measure the liquid suction rate of a cell. The method comprises the following steps of clamping a battery cell by using a clamp under the action of a preset clamping force; the clamp is suspended by a suspension rope and immersed in a cylinder in a suspension state, the cylinder is filled with electrolyte with preset weight, the weight of the battery cell in the suspension state is obtained and recorded as m1(ii) a Acquiring weight m of battery cell in real time under preset acquisition frequencytWherein t is a natural number until the weight of the battery cell does not change with time, and recording the weight m when the weight of the battery cell does not changenAnd determining the saturated liquid absorption amount, the liquid absorption rate and the average liquid absorption rate of the battery core. The invention provides a basis for the liquid injection amount of the battery, a basis for the secondary liquid injection aging time after the battery core is injected with liquid and a basis for applying different pretightening forces to the battery core.
Description
Technical Field
The invention belongs to the technical field of a cell measuring method, and particularly relates to a method and a device for testing imbibition rate.
Background
The lithium battery enters a large-scale industrial production stage in a modern process, and the battery is subjected to normal-temperature/high-temperature standing aging under the current production process conditions, so that the battery cell can be completely infiltrated by electrolyte, a lithium ion diffusion path is formed inside the battery, and the electrochemical performance of the battery is improved. Therefore, it is very important to establish an evaluation method for the liquid absorption rate of the battery core inside the battery core.
The specific evaluation method that the liquid absorption rate of the lithium battery pole piece does not have usually utilizes the method for testing the porosity of the pole piece/diaphragm to calculate the saturated liquid absorption amount of the pole piece and the diaphragm, can calculate the theoretical liquid absorption amount of the battery, provide the basis for the actual liquid injection, however, the current method can not calculate the liquid absorption rate, can not accurately estimate the standing aging time of the battery, and because the internal cell of the battery has internal stress, the liquid absorption rate is different from the free pole piece/diaphragm, the evaluation of the liquid absorption rate of the battery cell under different pretightening forces is heavier for the battery production, therefore, the saturated liquid absorption amount and the liquid absorption rate of the battery cell under the pretightening force condition are calculated, and the basis is provided for the theoretical liquid injection amount of the battery and the standing aging time of the battery.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a method for testing the imbibition rate, which solves the technical problems that the method in the prior art cannot accurately measure the imbibition rate of a battery core, so that the theoretical liquid injection amount of the battery and the standing aging time of the battery cannot be estimated. The technical scheme of the scheme has a plurality of technical beneficial effects, which are described as follows:
on the one hand, the method for testing the imbibition rate is suitable for testing the imbibition rate of the lithium battery cell under the pretightening force condition, and comprises the following steps:
clamping the battery cell by using a clamp under the action of a preset clamping force;
the clamp is suspended by a suspension rope and immersed in a cylinder in a suspension state, the cylinder is filled with electrolyte with preset weight, and the weight of the battery cell in the suspension state is obtained and recorded as m 1;
acquiring the weight mt of the battery cell in real time under a preset acquisition frequency, wherein t is a natural number until the weight of the battery cell does not change along with time, and recording the weight mn when the weight of the battery cell does not change;
according to the weight m1、mnAnd presetting acquisition frequency to determine the saturated liquid absorption amount, liquid absorption rate and average liquid absorption rate of the battery cell, specifically:
saturated liquid absorption quantity M, M ═ M of electric core1-mn；
The real-time liquid absorption rate of the battery core,
(2≤t≤n)；
the average liquid absorption rate of the battery cell,
wherein M is the saturated liquid absorption amount, tau is the acquisition frequency, and T is the time consumption from the initial test to the constant mass.
On the other hand provides a device of test of imbibition speed, is applicable to the test of lithium cell electricity core imbibition speed under the pretightning force condition, includes: supporting component, the carrier that bears who carries electrolyte, weighing device and pretightning force adjustable anchor clamps, anchor clamps pass through the suspension rope with the supporting component is connected, wherein:
the supporting component can horizontally place the weighing device;
the clamp can clamp the battery cell under the action of pretightening force;
the bearing piece can suspend or float the clamp by placing electrolyte;
the weighing device can acquire the weight of the battery cell in real time, record and display the weight and calculate a preset formula;
the shape of the battery cell is changed by the battery cell through the absorption of the electrolyte, the self buoyancy is changed until the buoyancy in the electrolyte is not changed, and the weighing device weighs the weight change of the battery cell at the preset acquisition frequency so as to calculate the liquid absorption rate of the battery cell.
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
according to the method provided by the invention, the battery is clamped by different clamping forces through the clamp and is soaked in the solution, the self volume of the battery core changes after the battery core absorbs part of the electrolyte, the weight of the battery core is obtained in real time through the weighing device according to the principles of Archimedes, acting force and reacting force, and the liquid absorption rate of the battery core is determined through weight conversion. Compared with the traditional method for calculating the liquid injection amount by testing the porosity, the method is simpler and more efficient, can simulate the liquid absorption amount and the liquid absorption rate of the battery cell under different pretightening force degrees, provides basis for the liquid injection amount of the battery, provides basis for the secondary liquid injection aging time after the liquid injection of the battery cell, can apply different pretightening forces to the battery cell, improves the manufacturing or production process of the lithium battery, and improves the service performance of the lithium battery.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a testing method according to the present invention;
FIG. 2 is a perspective view of the testing device of the present invention;
FIG. 3 is a graph of test cell absorption versus time for a test apparatus of the present invention;
wherein:
1. a platform; 2. a weighing device; 3. a cylinder; 4. a suspension rope; 5. the rod can be folded.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the disclosure, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. Additionally, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than the number, shape and size of the components in practical implementation, and the type, quantity and proportion of the components in practical implementation can be changed freely, and the layout of the components can be more complicated.
In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that aspects may be practiced without these specific details. In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
The method for testing the imbibition rate shown in fig. 1 is suitable for testing the imbibition rate of a lithium battery cell under a pretightening force condition, and comprises the following steps:
and S101, clamping the battery cell by using a clamp under the action of a preset clamping force. The fixture is required to be corrosion-resistant and does not react with the electrolyte, for example, the fixture adjusted by a jackscrew or a bolt can be a common steel plate fixture or a carbon fiber fixture limited by Shanghai Hakka automatic instrument), and the fixture can apply different pretightening forces to the battery cell for clamping, wherein the pretightening forces meet the test requirements;
it should be noted that: when the pretightening force is 0 or no clamp is applied to the battery cell, the pretightening force can be equal to only suspending the battery cell and still fall within the protection range of the patent;
s102, suspending the clamp by a suspension rope and immersing the clamp in a cylinder in a suspension state, wherein the cylinder is filled with electrolyte with preset weight (the electrolyte can be used as electrolyte such as EMC (electro magnetic compatibility), EC (EC) or DMC (DMC) solvent, or the electrolyte used by a corresponding product), and the weight of the battery cell in the suspension state is obtained and recorded as m 1; the suspension rope has the characteristics of no imbibition, no deformation, electrolyte corrosion resistance and high tensile strength;
the weight mt of the battery cell is acquired in real time under a preset acquisition frequency, the preset acquisition frequency, for example, the set frequency can be 1 time/ms-1 time/h, the test accuracy is related to the data acquisition frequency and shows positive correlation,
wherein t is a natural number, until the weight of the battery cell does not change along with time, and the weight mn when the weight of the battery cell does not change is recorded, specifically:
platforms with horizontal struts or limbs are used, for example, angle-adjustable 90-degree foldable rods, one end of which is connected to the platform in the vertical direction and the other end of which is connected to a suspension rope. The platform is placed with the weighing device who is connected with the controller electricity, and the controller still electricity is connected with display device, can show electric core or anchor clamps weight transform. On the weighing device place the platform, and placed the drum on the weighing device, the sealed lid of platform drum has closed the cover, and electrolyte itself has certain volatility, keeps sealed as far as possible, reduces electrolyte and volatilizees to the quality test influence. The central area of the cylinder cover is provided with a round hole which can enable the platform suspension rope to freely pass through, one end of the platform suspension rope is connected with the platform horizontal supporting rod or the extension branch, and the other end of the platform suspension rope is connected with the platform clamp.
S103, according to the weight m1、mnAnd presetting acquisition frequency to determine saturated liquid absorption amount, liquid absorption rate and average liquid absorption rate of the battery cell, specifically, calculating according to Archimedes principle, acting force principle and reaction force principle, and obtaining the tensile force F of the suspension ropeRope＝mBattery cellg-ρgvRow boardThe weight weighed by the weighing device is mBattery cellg-F rope, further mBattery cellg-(mBattery cellg-ρgvRow board)＝ρgvRow boardTherefore, it can be converted into a formula that the change of the cell volume causes the change of the buoyancy, that is, the change of the weight weighed by the weighing device, and the change is converted into the following formula:
saturated liquid absorption quantity M, M ═ M of electric core1-mn；
The real-time liquid absorption rate of the battery core,
(2≤t≤n)；
the average liquid absorption rate of the battery cell,
wherein M is the saturated liquid absorption amount, tau is the acquisition frequency, and T is the time consumption from the initial test to the constant mass. The method is used for simulating the liquid absorption amount and the liquid absorption rate of the battery cell under different pretightening force degrees, and providing a basis for the standing and aging time of the battery.
According to the method provided by the invention, the battery is clamped by different clamping forces through the clamp and is soaked in the solution, the self volume of the battery core changes after the battery core absorbs part of the electrolyte, the weight of the battery core is obtained in real time through the weighing device according to the principles of Archimedes, acting force and reacting force, and the liquid absorption rate of the battery core is determined through weight conversion. Compared with the traditional method for calculating the liquid injection amount by testing the porosity, the method is simpler and more efficient, can simulate the liquid absorption amount and the liquid absorption rate of the battery cell under different pretightening force degrees, provides basis for the standing aging time of the battery, not only can provide basis for the liquid injection amount of the battery, but also can provide basis for applying different pretightening forces to the battery cell, perfects the manufacturing or production process of the lithium battery, and improves the service performance of the lithium battery.
Testing, for example, in the above device, the weighing device is an electronic balance, the balance precision is 0.01g, and the upper weighing limit is 10 kg; the foldable rod adopts a 90-degree bracket, and the length of the foldable rod is 50-100 cm; the length of the hanging rope is 50-200cm, and the material requirement is as follows: non-liquid-absorbing, stretch-proof, e.g., from fiberglass; the volume of the cylinder with the cover is 1-5L, the diameter is 10-100cm, the height is 20-50cm (the height needs to exceed the height of a test electric core), the cover can be detached, and a small hole is drilled in the center of the cover, so that a hanging rope can conveniently penetrate through the small hole;
connecting the balance with a computer for recording test data in real time;
tightening the cell to be tested by using a light fixture, and applying a pre-tightening force of 0-5000N;
according to the method, 500-3000ml of electrolyte is added into the cylinder with the cover, and the adding amount of the electrolyte needs to ensure that the battery core and the clamp can be completely immersed when the battery core with the clamp is vertically placed into the barrel;
hanging the battery cell with the clamp to be tested at one end of the suspension rope, completely immersing the battery cell in the electrolyte, keeping the battery cell suspended in the electrolyte and not contacting with the periphery of the barrel wall, and recording the mass m1 of the battery cell when the battery cell is just put into the electrolyte;
keeping the battery core soaked in the electrolyte, keeping the quality data recorded all the time during the period, keeping the quality mt changing along with time until the quality keeps constant (at the moment, the quality mn), and terminating the test;
the used battery cell is an experimental battery cell, the mass of the battery cell is about 500g, the mass of the clamp is about 300g, the applied pretightening force interval is 10-1000N, the measured change curve of the mass of the battery cell in the electrolyte along with the time is shown in figure 3, and the arrangement is shown in a table I:
| m1/g | mn/g | T/min |
| 1807.73 | 1733.08 | 398 |
According to the above table, the saturated liquid absorption amount is 74.65g, the average liquid absorption rate is 0.188g/min, and the real-time liquid absorption rate is obtained by reading the mass values of two adjacent points.
On the other hand, a device for testing the imbibition rate is provided, as shown in fig. 2, and is suitable for testing the imbibition rate of the lithium battery cell under the pre-tightening force condition, including: supporting component, the carrier that carries electrolyte, anchor clamps with adjustable weighing device 2 and pretightning force, anchor clamps pass through suspension rope 4 and are connected with 1 supporting component of platform, wherein:
the supporting component can horizontally place the weighing device 2 of the platform 1;
specifically, the method comprises the following steps: the supporting component comprises a platform 1 and a foldable supporting rod component, and the included angle formed by folding is 90 degrees; the supporting rod assembly is vertically arranged on the platform 1, is connected with one end of the suspension rope 4 and is used for placing the weighing device 2;
the clamp can clamp the battery cell under the action of pretightening force, and the applied pretightening force is 0-5000N;
the bearing piece can suspend or float the clamp by placing electrolyte, such as the cylinder 3 with the cover, and is connected in a sealing way, such as installing a sealing ring or a sealing gasket, and the material is made of a material which does not react with the electrolyte and is not corroded;
the bearing piece is a cylinder 3, one end of the bearing piece is opened and is provided with a cylinder cover, the cylinder cover can cover the cylinder 3 in a sealing mode, a hole with the shape matched with that of the suspension rope 4 is formed in the central area of the bearing piece, the suspension rope 4 can freely penetrate through the hole, one end of the suspension rope 4 is connected with the support rod assembly, and the other end of the suspension rope 4 is connected with the clamp;
the weighing device 2 can acquire the weight of the battery cell in real time, record and display the weight, calculate a preset formula (the formula is used for calculation), is connected with the controller and is provided with a display device;
the shape of electric core is changed through the absorption to electrolyte to electric core, changes the buoyancy of self and does not change until buoyancy in electrolyte, and weighing device 2 is in presetting the weight transform of gathering the frequency and weighing electric core to calculate the imbibition speed of electric core.
As an embodiment provided by the present disclosure, the injection device further includes a vacuum pumping device (not shown in the figure) communicated with the cylinder 3, and the vacuum pumping device can maintain the pressure of the cylinder 3 in a preset negative pressure environment by pumping air in the cylinder 3, so as to simulate the injection condition.
As mentioned above, the carrier is provided in a sealed configuration.
The products provided by the present invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the invention without departing from the inventive concept, and those improvements and modifications also fall within the scope of the claims of the invention.
Claims (10)
1. A method for testing the imbibition rate is suitable for testing the imbibition rate of a lithium battery cell under the condition of pretightening force, and is characterized by comprising the following steps:
clamping the battery cell by using a clamp under the action of a preset clamping force;
the clamp is suspended by a suspension rope and immersed in a cylinder in a suspension state, the cylinder is filled with electrolyte with preset weight, and the weight of the battery cell in the suspension state is obtained and recorded as m 1;
acquiring the weight mt of the battery cell in real time under a preset acquisition frequency, wherein t is a natural number until the weight of the battery cell does not change along with time, and recording the weight mn when the weight of the battery cell does not change;
and determining the saturated liquid absorption amount, the liquid absorption rate and the average liquid absorption rate of the battery cell according to the weights m1 and mn and a preset acquisition frequency.
2. The method of claim 1, wherein the clamp is suspended by a suspension rope and immersed in a suspended state in a cylinder, the cylinder is filled with a preset weight of electrolyte, and the method for obtaining the weight of the battery cell in the suspended state comprises:
a platform with a horizontal supporting rod or a branch extending rod is used, a weighing device electrically connected with a controller is placed on the platform, and the cylinder is placed on the weighing device;
the cylinder is covered with a cylinder cover in a sealing manner, a circular hole enabling the suspension rope to freely penetrate through is formed in the central area of the cylinder cover, one end of the suspension rope is connected with the horizontal supporting rod or the extension branch, and the other end of the suspension rope is connected with the clamp.
3. The method of claim 2, wherein the method of determining the saturated liquid uptake, the liquid uptake rate, and the average liquid uptake rate of the cell comprises:
saturated liquid absorption quantity M, M ═ M of electric core1-mn；
The real-time liquid absorption rate of the battery core,
(2≤t≤n)；
the average liquid absorption rate of the battery cell,
wherein M is the saturated liquid absorption amount, tau is the acquisition frequency, and T is the time consumption from the initial test to the constant mass.
4. The utility model provides a device of test of imbibition speed, is applicable to the test of lithium cell electricity core imbibition speed under the pretightning force condition which characterized in that includes: supporting component, the carrier that bears who carries electrolyte, weighing device and pretightning force adjustable anchor clamps, anchor clamps pass through the suspension rope with the supporting component is connected, wherein:
the supporting component can horizontally place the weighing device;
the clamp can clamp the battery cell under the action of pretightening force;
the bearing piece can suspend or float the clamp by placing electrolyte;
the weighing device can acquire the weight of the battery cell in real time, record and display the weight and calculate a preset formula;
the shape of the battery cell is changed by the battery cell through the absorption of the electrolyte, the self buoyancy is changed until the buoyancy in the electrolyte is not changed, and the weighing device weighs the weight change of the battery cell at the preset acquisition frequency so as to calculate the liquid absorption rate of the battery cell.
5. The apparatus of claim 4, wherein the support assembly comprises a platform and a collapsible strut assembly, wherein:
the platform is used for placing the weighing device;
the strut assembly is mounted on the platform in the vertical direction and is connected with one end of the suspension rope.
6. Device according to claim 5, characterized in that the carrier is a cylinder and is open at one end and provided with a cover which can be closed in a sealing manner over the cylinder and which is provided in a central area with a hole which is shaped to fit the string, so that the string can be transported freely through the hole.
7. The device of claim 6, wherein the suspension cord is connected to the strut assembly at one end and to the clamp at the other end.
8. The device of claim 7, wherein the hanger rope is made of a fiberglass material.
9. The apparatus of claim 6, further comprising a vacuum extractor in communication with the cylinder, the vacuum extractor being capable of maintaining the pressure of the cylinder at a predetermined negative pressure by extracting air from within the cylinder.
10. The apparatus of claim 9, wherein the carrier is disposed in a sealed configuration.
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| CN202110554494.8A CN113218806A (en) | 2021-05-20 | 2021-05-20 | Method and device for testing imbibition rate |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113834758A (en) * | 2021-09-22 | 2021-12-24 | 蜂巢能源科技有限公司 | Method and device for testing battery core pole group wetting performance |
| CN114252363A (en) * | 2021-12-09 | 2022-03-29 | 上海兰钧新能源科技有限公司 | Method for measuring pole piece infiltration liquid absorption amount |
-
2021
- 2021-05-20 CN CN202110554494.8A patent/CN113218806A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113834758A (en) * | 2021-09-22 | 2021-12-24 | 蜂巢能源科技有限公司 | Method and device for testing battery core pole group wetting performance |
| CN114252363A (en) * | 2021-12-09 | 2022-03-29 | 上海兰钧新能源科技有限公司 | Method for measuring pole piece infiltration liquid absorption amount |
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