CN113125337B - Teflon coating adaptation detection method and battery cell diaphragm needle removal device - Google Patents
Teflon coating adaptation detection method and battery cell diaphragm needle removal device Download PDFInfo
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- CN113125337B CN113125337B CN202110293764.4A CN202110293764A CN113125337B CN 113125337 B CN113125337 B CN 113125337B CN 202110293764 A CN202110293764 A CN 202110293764A CN 113125337 B CN113125337 B CN 113125337B
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- 239000004809 Teflon Substances 0.000 title claims abstract description 230
- 229920006362 Teflon® Polymers 0.000 title claims abstract description 230
- 238000000576 coating method Methods 0.000 title claims abstract description 230
- 239000011248 coating agent Substances 0.000 title claims abstract description 211
- 230000006978 adaptation Effects 0.000 title claims abstract description 30
- 238000001514 detection method Methods 0.000 title claims abstract description 23
- 238000004804 winding Methods 0.000 claims abstract description 70
- 230000003044 adaptive effect Effects 0.000 claims abstract description 36
- 238000000034 method Methods 0.000 claims abstract description 14
- 210000004027 cell Anatomy 0.000 claims description 47
- 210000000170 cell membrane Anatomy 0.000 claims description 20
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000005096 rolling process Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 3
- 238000007767 slide coating Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 9
- 230000035515 penetration Effects 0.000 description 22
- 239000011247 coating layer Substances 0.000 description 8
- 230000008569 process Effects 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 229910001416 lithium ion Inorganic materials 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 238000007781 pre-processing Methods 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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- G01N19/00—Investigating materials by mechanical methods
- G01N19/02—Measuring coefficient of friction between materials
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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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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The application provides a Teflon coating adaptation detection method and a battery core diaphragm needle removal device. The method comprises the steps of obtaining a needle release pulling force value and a needle release pressure value of needle release equipment, wherein the needle release pressure value is a positive pressure between a Teflon coating and a battery core diaphragm; carrying out pretreatment operation on the needle release pulling force value and the needle release pressure value to obtain a needle release friction line quantity; and selecting a Teflon coating adaptive to the battery core diaphragm according to the needle-off friction dimension. The friction coefficient between various teflon coatings and the battery core diaphragm can be obtained only by rubbing between corresponding materials, so that the friction coefficient of the teflon coatings adaptive to the battery core diaphragm can be quickly determined, the teflon coatings adaptive to the battery core diaphragm are not required to be determined by a winding mode of the battery core diaphragm, the variety of the teflon coatings adaptive to the battery core diaphragm is limited, all the teflon coatings are not required to be detected, and the adaptation time of the teflon coatings is shortened.
Description
Technical Field
The invention relates to the technical field of winding of battery cell diaphragms, in particular to a teflon coating adaptation detection method and a battery cell diaphragm needle removal device.
Background
With the development of lithium ion battery technology, lithium ion batteries have the characteristics of large energy, small volume, portability and the like, and gradually become mainstream electric energy supply sources. The core of the lithium ion battery is manufactured by adopting a winding process, the core pulling phenomenon of a winding needle wound by the core is a common problem in a winding field, and the core pulling problem can be effectively solved by methods of pasting teflon on the winding needle, spraying teflon liquid and the like.
However, when a suitable teflon product in winding contact with the cell membrane is selected, usually, a proper product is found in a non-directional trial and error, the cell membrane needs to be wound on different teflon coatings, and the teflon product which can be smoothly stripped can be determined after needle stripping tests are respectively performed, so that a large amount of time is spent on selecting the teflon product, the production cost of the lithium ion cell is increased, and the production efficiency of the lithium ion battery is seriously reduced.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a teflon coating adaptation detection method and a battery core diaphragm needle removal device for reducing the adaptation time of a teflon coating.
The purpose of the invention is realized by the following technical scheme:
a teflon coating suitability detection method, the method comprising:
acquiring a needle release pulling force value and a needle release pressure value of needle release equipment, wherein the needle release pressure value is a positive pressure between a Teflon coating and a battery core diaphragm;
carrying out pretreatment operation on the needle release pulling force value and the needle release pressure value to obtain a needle release friction line quantity;
and selecting a Teflon coating adaptive to the battery core diaphragm according to the needle-off friction dimension.
In one embodiment, the preprocessing the needle-release pulling force value and the needle-release pressure value to obtain a needle-release friction dimension includes: and carrying out ratio value taking operation on the needle release pulling force value and the needle release pressure value to obtain a needle release friction coefficient interval.
In one embodiment, the selecting a teflon coating adapted to the cell membrane according to the needle-off friction dimension includes: acquiring the friction coefficient between the battery core diaphragm and each Teflon coating; and selecting a Teflon coating corresponding to the adaptive friction coefficient according to the needle-off friction coefficient interval.
In one embodiment, the selecting a teflon coating corresponding to the adaptive friction coefficient according to the needle-off friction coefficient interval includes: detecting whether the friction coefficient is matched with the needle release friction coefficient interval or not; and when the friction coefficient is matched with the needle-off friction coefficient interval, selecting a Teflon coating corresponding to the friction coefficient.
In one embodiment, the step of detecting whether the friction coefficient is matched with the needle release friction coefficient interval comprises: detecting whether the friction coefficient is larger than or equal to the first needle withdrawal friction coefficient and whether the friction coefficient is smaller than or equal to the second needle withdrawal friction coefficient; when the friction coefficient is matched with the needle-off friction coefficient interval, selecting a Teflon coating corresponding to the friction coefficient, wherein the selecting comprises the following steps: and when the friction coefficient is larger than or equal to the first pin removal friction coefficient and is smaller than or equal to the second pin removal friction coefficient, setting the Teflon coating corresponding to the friction coefficient as a matching coating.
In one embodiment, the detecting whether the friction coefficient is greater than or equal to the first needle release friction coefficient and whether the friction coefficient is less than or equal to the second needle release friction coefficient further comprises: and when the friction coefficient is smaller than the first needle release friction coefficient, setting the Teflon coating corresponding to the friction coefficient as an easy-to-slide coating.
In one embodiment, the detecting whether the friction coefficient is greater than or equal to the first needle release friction coefficient and whether the friction coefficient is less than or equal to the second needle release friction coefficient further comprises: and when the friction coefficient is larger than the second needle release friction coefficient, setting the Teflon coating corresponding to the friction coefficient as an easy-to-block coating.
In one embodiment, the acquiring a needle release pressure value of the needle release device includes: acquiring a clamping force value of the needle release equipment; and carrying out pressure conversion operation on the clamping force value to obtain the needle release pressure value.
In one embodiment, the performing a pressure conversion operation on the clamping force value to obtain the needle release pressure value includes: acquiring a film winding and pressing value of the battery core diaphragm; and obtaining the needle release pressure value according to the clamping force value and the rolled film rolling pressure value.
A cell septum needle removal device comprising: the device comprises a base, a diaphragm winding assembly, a diaphragm needle-releasing assembly and an adaptive detection assembly; the diaphragm winding assembly comprises a rotating motor, a diaphragm winding needle and a Teflon coating, the rotating motor is arranged on the base, the Teflon coating is located on the diaphragm winding needle, the diaphragm winding needle is connected with an output shaft of the rotating motor, and the Teflon coating is used for winding the battery core diaphragm; the diaphragm needle-removing assembly comprises a needle-removing device and a telescopic motor, the telescopic motor is connected with the base, an output shaft of the telescopic motor is connected with the needle-removing device, the telescopic motor is used for pushing the needle-removing device, and the needle-removing device is used for clamping a wound battery core diaphragm; the adaptive detection assembly comprises a pressure collector and a friction coefficient processor, and the pressure collector is connected with the friction coefficient processor; the pressure collector is used for acquiring a needle release pulling force value and a needle release pressure value of the needle release device; the friction coefficient processor is used for carrying out pretreatment operation on the needle release pulling force value and the needle release pressure value to obtain a needle release friction line quantity; and the friction coefficient processor is also used for selecting a Teflon coating matched with the battery core diaphragm according to the needle-off friction dimension.
Compared with the prior art, the invention has at least the following advantages:
through the comparison of the needle release pulling force value and the needle release pressure value, the friction coefficient between the Teflon coating and the battery core diaphragm is obtained, namely the needle release friction line value, the required Teflon coating is judged according to the needle release friction line value, the friction coefficient between various Teflon coatings and the battery core diaphragm can be obtained only by rubbing corresponding materials, the friction coefficient of the Teflon coating adaptive to the battery core diaphragm can be rapidly determined without being determined by a mode of winding the battery core diaphragm, and the type of the Teflon coating adaptive to the battery core diaphragm is limited without detecting all the Teflon coatings, so that the adaptation time of the Teflon coating is shortened.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a flow chart of a Teflon coating adaptation detection method in one embodiment.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The invention relates to a teflon coating adaptation detection method. In one embodiment, the teflon coating adaptation detection method comprises the steps of obtaining a needle release pulling force value and a needle release pressure value of needle release equipment, wherein the needle release pressure value is a positive pressure between a teflon coating and a cell diaphragm; carrying out pretreatment operation on the needle release pulling force value and the needle release pressure value to obtain a needle release friction line quantity; and selecting a Teflon coating adaptive to the battery core diaphragm according to the needle-off friction dimension. Through the comparison of the needle release pulling force value and the needle release pressure value, the friction coefficient between the Teflon coating and the battery core diaphragm is obtained, namely the needle release friction line value, the required Teflon coating is judged according to the needle release friction line value, the friction coefficient between various Teflon coatings and the battery core diaphragm can be obtained only by rubbing corresponding materials, the friction coefficient of the Teflon coating adaptive to the battery core diaphragm can be rapidly determined without being determined by a mode of winding the battery core diaphragm, and the type of the Teflon coating adaptive to the battery core diaphragm is limited without detecting all the Teflon coatings, so that the adaptation time of the Teflon coating is shortened.
Please refer to fig. 1, which is a flowchart illustrating a teflon coating adaptation detection method according to an embodiment of the present invention. The Teflon coating adaptation detection method comprises the following steps of part or all of.
S100: and acquiring a needle release pulling force value and a needle release pressure value of the needle release device, wherein the needle release pressure value is a positive pressure between the Teflon coating and the battery core diaphragm.
In this embodiment, the needle release pulling force value is the pushing and pulling force of a telescopic motor on the needle release device, and the needle release pulling force value is convenient to change by adjusting the telescopic force of the telescopic motor, and under different conditions, the size of the needle release pulling force value can be changed to be suitable for needle release of different battery cell diaphragms, that is, when the needle release operation is performed on the same battery cell diaphragm, the needle release pulling force applied by the needle release device is fixed, so that the teflon coating adaptive to the same battery cell diaphragm can be conveniently determined. The needle release pressure value is the pressure applied to the battery cell diaphragm by a needle release device on the needle release equipment, the friction coefficient between the Teflon coating and the battery cell diaphragm is convenient to determine in the follow-up process, and the needle release pressure value is determined, so that the friction condition between the Teflon coating and the battery cell diaphragm is more accurate. Moreover, in this embodiment, the needle release pulling force value and the needle release pressure value are values built in the needle release device, the needle release pulling force value can be adjusted by controlling the telescopic motor, and the needle release pressure value can be adjusted by controlling the needle release device under the condition that the winding process of the cell membrane is not changed, so that the cell membrane and the teflon coating layer do not need to be arranged on the needle release device, and the values can be retrieved through a built-in database of the needle release device.
S200: and carrying out pretreatment operation on the needle release pulling force value and the needle release pressure value to obtain a needle release friction line quantity.
In this embodiment, the needle-release pulling force value and the needle-release pressure value are subjected to a preprocessing operation, for example, a ratio between the needle-release pulling force value and the needle-release pressure value is obtained. The needle release pulling force value is the release acting force of the battery cell diaphragm on the winding needle, and the needle release pressure value is the extrusion force between the battery cell diaphragm and the Teflon coating when the battery cell diaphragm is released from the winding needle, namely the positive pressure exerted on the Teflon coating by the battery cell diaphragm. Thus, according to a calculation formula of the friction force, the obtained needle release friction line quantity is a ratio of the needle release pulling force value to the needle release pressure value, namely a friction coefficient of the battery cell diaphragm on the teflon coating, namely the friction coefficient of the teflon coating when sliding relative to the battery cell diaphragm. Therefore, after the needle-off friction dimension is obtained, the cell diaphragm can be determined to smoothly separate from the Teflon coating layer by the corresponding friction coefficient, so that the type of the required Teflon coating layer can be determined conveniently.
S300: and selecting a Teflon coating adaptive to the battery core diaphragm according to the needle-off friction dimension.
In this embodiment, the needle release pressure value is adjustable, so that the needle release friction dimension is a range of friction coefficients. When the Teflon coating is selected according to the needle release friction dimension, the type of the Teflon coating can be conveniently limited only by selecting the friction coefficient within the corresponding range of the needle release friction dimension, namely, the corresponding Teflon coating is selected according to the range of the needle release friction dimension, the Teflon coating is matched with the battery cell diaphragm, the Teflon coating meeting the requirement is selected for the subsequent actual test process, and the selection condition is that the needle release equipment is convenient to separate the battery cell diaphragm from the coil needle attached with the Teflon coating.
In one embodiment, the preprocessing the needle-release pulling force value and the needle-release pressure value to obtain a needle-release friction dimension includes: and carrying out ratio value taking operation on the needle release pulling force value and the needle release pressure value to obtain a needle release friction coefficient interval. In this embodiment, in the case of the cell membrane determination, the corresponding withdrawal tension value remains unchanged, which is to facilitate the determination of the adapted teflon coating. Because the needle release pressure value is adjustable, under the fixed condition of needle release tension value, the needle release tension value with the needle release pressure value is got the norm ratio operation, is about to the needle release tension value with the maximum value and the minimum value of needle release pressure value are got the ratio, and the friction dimension of taking off the needle that obtains is a ratio that has the scope, makes the needle release friction coefficient interval be with a friction coefficient interval that the teflon coating of electric core diaphragm adaptation corresponds, for the teflon coating of adaptation provides the friction coefficient in an interval range, be convenient for follow-up according to the teflon coating of taking off the needle friction coefficient interval and confirming the adaptation has saved and has carried out the adaptation and compare to all teflon coatings, has reduced the time of selecting the teflon coating of adaptation.
Further, the selecting of the teflon coating adaptive to the battery core diaphragm according to the needle-off friction dimension includes: acquiring the friction coefficient between the battery core diaphragm and each Teflon coating; and selecting a Teflon coating corresponding to the adaptive friction coefficient according to the needle-off friction coefficient interval. In this embodiment, the friction coefficient between the battery cell diaphragm and each of the teflon coatings is not performed on the needle removal device, but is obtained through experimental data between a material of the battery cell diaphragm and a material of each of the teflon coatings, and after the material of the battery cell diaphragm is fixed, the friction coefficient of each of the teflon coatings on the battery cell diaphragm, that is, the friction coefficient of each of the teflon coatings is obtained through the friction coefficient detector. Therefore, after the friction coefficient of the Teflon coating is obtained in advance, the friction coefficient of the Teflon coating is compared with the needle release friction coefficient interval, whether the friction coefficient of the Teflon coating is an element in the needle release friction coefficient interval or not is determined, and the Teflon coating matched with the battery core diaphragm can be determined subsequently.
Furthermore, the selecting of the teflon coating corresponding to the adaptive friction coefficient according to the needle-off friction coefficient interval comprises: detecting whether the friction coefficient is matched with the needle release friction coefficient interval or not; and when the friction coefficient is matched with the needle-off friction coefficient interval, selecting a Teflon coating corresponding to the friction coefficient. In this embodiment, the needle-release friction coefficient interval is used as a friction coefficient range value of a teflon coating layer adapted to a cell membrane, the friction coefficient is a friction factor between each teflon coating layer and the cell membrane in an actual test, and after the material of the cell membrane is determined, the friction coefficient is a friction factor when the teflon coating layer moves relatively on the cell membrane. Therefore, the friction coefficient is matched with the needle-off friction coefficient interval, the friction coefficient corresponding to the current Teflon coating is shown to be located in the needle-off friction coefficient interval, and the current Teflon coating can be used as a Teflon coating which is measured and adapted subsequently.
Still further, the step of detecting whether the friction coefficient is matched with the needle release friction coefficient interval includes: detecting whether the friction coefficient is larger than or equal to the first needle withdrawal friction coefficient and whether the friction coefficient is smaller than or equal to the second needle withdrawal friction coefficient; when the friction coefficient is matched with the needle-off friction coefficient interval, selecting a Teflon coating corresponding to the friction coefficient, wherein the selecting comprises the following steps: and when the friction coefficient is larger than or equal to the first pin removal friction coefficient and is smaller than or equal to the second pin removal friction coefficient, setting the Teflon coating corresponding to the friction coefficient as a matching coating. In this embodiment, the first and second needle release friction coefficients are used as two end points of the needle release friction coefficient interval, for example, the first needle release friction coefficient is the minimum friction coefficient of the needle release friction coefficient interval, and the second needle release friction coefficient is the maximum friction coefficient of the needle release friction coefficient interval. The first needle-off friction coefficient is used as the minimum friction coefficient of the battery cell diaphragm on the Teflon coating, so that the minimum value of the battery cell diaphragm which can be wound on the Teflon coating is ensured, namely the battery cell diaphragm is easy to slip on the Teflon coating which is smaller than the first needle-off friction coefficient; the second needle-off friction coefficient is used as the maximum friction coefficient of the battery core diaphragm on the Teflon coating, so that the maximum value of winding of the battery core diaphragm on the Teflon coating is ensured, namely the battery core diaphragm cannot move on the Teflon coating which is larger than the second needle-off friction coefficient, and the battery core diaphragm can be separated by a larger needle-off pulling force at the moment, so that the battery core diaphragm can be torn. The friction coefficient is larger than or equal to the first needle release friction coefficient, and the friction coefficient is smaller than or equal to the second needle release friction coefficient, so that the friction coefficient corresponding to the current Teflon coating meets the requirement, namely the currently used Teflon coating can be convenient for the cell diaphragm to smoothly separate, and the currently used Teflon coating can smoothly realize needle release. Therefore, the Teflon coating corresponding to the required friction coefficient is selected as the adaptive coating, and can be used as the Teflon coating for the subsequent actual test, namely, the Teflon coating can be used for performing the needle release test on the wound battery core diaphragm.
Still further, the detecting whether the friction coefficient is greater than or equal to the first needle release friction coefficient and whether the friction coefficient is less than or equal to the second needle release friction coefficient further comprises: and when the friction coefficient is smaller than the first needle release friction coefficient, setting the Teflon coating corresponding to the friction coefficient as an easy-to-slide coating. In this embodiment, the first needle-off friction coefficient is used as the minimum friction coefficient of the cell membrane on the teflon coating, so as to ensure the minimum value that the cell membrane can be wound on the teflon coating, that is, the cell membrane is likely to slip on the teflon coating which is smaller than the first needle-off friction coefficient. The friction coefficient is smaller than the first needle release friction coefficient, which indicates that the friction coefficient between the current teflon coating and the battery core diaphragm is smaller, i.e. the contact surface between the teflon coating and the battery core diaphragm is smoother, which easily causes the battery core diaphragm to be incapable of being wound on the teflon coating, thereby being incapable of meeting the requirements and being incapable of being applied to practice.
Still further, the detecting whether the friction coefficient is greater than or equal to the first needle release friction coefficient and whether the friction coefficient is less than or equal to the second needle release friction coefficient further comprises: and when the friction coefficient is larger than the second needle release friction coefficient, setting the Teflon coating corresponding to the friction coefficient as an easy-to-block coating. In this embodiment, the second needle release friction coefficient is used as the maximum friction coefficient of the cell membrane on the teflon coating, so that the maximum value of the cell membrane that can be wound on the teflon coating is ensured, that is, the cell membrane will not move on the teflon coating that is larger than the second needle release friction coefficient, and at this time, a larger needle release tension force is required to disengage, which may cause tearing of the cell membrane. Although the cell diaphragm can be wound on the teflon coating, the friction coefficient between the cell diaphragm and the teflon coating is too large, so that the contact surface between the cell diaphragm and the teflon coating is rough, the cell diaphragm cannot be separated from the teflon coating under the same needle-off tension value, and the teflon coating is also unsatisfactory.
In one embodiment, the acquiring a needle release pressure value of the needle release device includes: acquiring a clamping force value of the needle release equipment; and carrying out pressure conversion operation on the clamping force value to obtain the needle release pressure value. In this embodiment, the clamping force value is a pressure value corresponding to the clamping force of the needle removing device on the battery cell diaphragm, the clamping force value is subjected to pressure conversion operation, and the positive pressure of the battery cell diaphragm acting on the teflon coating is derived based on the clamping force value, so that the real pressure value between the battery cell diaphragm and the teflon coating is conveniently determined, and the measurement accuracy of the friction coefficient between the battery cell diaphragm and the teflon coating is improved.
Further, the performing a pressure conversion operation on the clamping force value to obtain the needle release pressure value includes: acquiring a film winding and pressing value of the battery core diaphragm; and obtaining the needle release pressure value according to the clamping force value and the rolled film rolling pressure value. In this embodiment, the winding pressure value is an internal pressure corresponding to the winding of the cell separator, that is, the winding pressure value is a pressure applied to the teflon coating when the cell separator is in a winding state, and the size of the winding pressure value is only affected by the material and the winding process of the winding pressure value. Thus, for the same type of cell separator, the winding pressure value of the winding film is relatively stable under the same winding process. The extrusion force of the Teflon coating can be changed only by adjusting the clamping force of the needle extractor, namely, the film rolling pressure value and the clamping force value act on the Teflon coating together, namely, the positive pressure of the Teflon coating is the sum of the film rolling pressure value and the clamping force value.
It can be understood that the teflon coating is used for coiling electric core diaphragm, and the teflon coating of here is the teflon of cylindric structure, be used for on the teflon coating with roll up the through-hole of core joint, be convenient for the teflon coating rotates with rolling up core together to the realization is to the coiling of electric core diaphragm. When the suitability of the teflon coating is detected, the friction coefficient between each teflon coating and the battery cell diaphragm needs to be obtained in advance, that is, the friction coefficient of each teflon coating is obtained before actual test is performed on the needle removal device, for example, the teflon coating is placed on a tiled battery cell diaphragm for mobile measurement; as another example, each teflon coating was measured by a coefficient of friction meter.
However, when the protrusion appears on the teflon coating, the friction coefficient between the teflon coating and the battery core diaphragm will increase, which easily causes some teflon coatings that are not adapted to the battery core diaphragm to have an adaptation situation, for example, because the protrusion appears on the teflon coating, the friction coefficient of the teflon coating that is smaller than the needle-off friction line increases, which results in that this part of the teflon coating can be used as the teflon coating adapted to the battery core diaphragm, so that when the battery core diaphragm is actually wound, the depression situation is generated on the battery core diaphragm, thereby affecting the quality of the battery core, and even causing the qualification rate of the battery core to decrease.
In order to reduce the misjudgment probability of detecting the convex teflon coating as the adaptive teflon coating, the teflon coating adaptive to the battery core diaphragm is selected according to the needle-off friction line quantity, and then the method further comprises the following steps:
acquiring a winding surface image of a Teflon coating, wherein the winding surface image is a surface image of the Teflon coating in contact with a battery core diaphragm;
acquiring the brightness value of each winding sub-image according to the winding surface image;
comparing the brightness value with a preset brightness value to obtain a brightness difference value;
detecting whether the brightness difference value is less than 0;
when the bright differential value is less than 0, the Teflon coating is set as a non-adaptive coating.
In this embodiment, the surface of the teflon coating layer is divided into a plurality of winding surfaces, each winding surface corresponds to one winding sub-image, that is, each winding surface corresponds to one image, and the plurality of winding sub-images form the image of the cylindrical side surface of the teflon coating layer, for example, the areas of the winding sub-images are equal. And after the brightness value of each winding sub-image is obtained, the brightness value is used as the brightness of the corresponding winding sub-image. The preset surface brightness value is a standard surface brightness value, the preset surface brightness value is also the brightness corresponding to the winding sub-image on the Teflon coating when no bulge exists, the surface brightness value is compared with the preset surface brightness value, and a difference value between the surface brightness value and the preset surface brightness value is obtained, namely the surface brightness difference value is used for showing the difference between the current brightness and the standard brightness of the surface of the Teflon coating. The brightness difference value is less than or greater than 0, which indicates that the brightness of the current Teflon coating is too bright or too dark, namely that the current Teflon coating has a bulge, and the Teflon coating is not satisfactory and cannot be used for winding the cell diaphragm. Like this, will the teflon coating is established to non-adaptation coating for there is bellied teflon coating further to be rejected, has reduced to have bellied teflon coating to detect the erroneous judgement probability of the teflon coating of adaptation, further improves the suitability of teflon coating, has further reduced teflon coating adaptation time.
Further, when the brightness value of the winding surface image of the teflon coating is detected, if the brightness reduction on the teflon coating is a crack, the brightness reduction on the surface of the teflon coating can also be caused by the crack, however, the crack exists on the teflon coating and can damage the cell diaphragm. Therefore, the teflon coating which has the crack and is matched with the battery core diaphragm can be used, namely, as long as the friction coefficient of the teflon coating with the crack is matched with the battery core diaphragm, the teflon coating can be used as a spare teflon coating to increase the available alternative use amount of the matched teflon coating, so that the production cost of the battery core can be reduced.
In order to achieve the above object of reducing the production cost, when the bright differential value is less than 0, the teflon coating is set as a non-adaptive coating, and the method further comprises the following steps:
when the brightness difference value is smaller than 0, performing radio frequency receiving operation on the area where the winding sub-image is located to obtain radio frequency effective penetration strength;
comparing the radio frequency effective penetration strength with a preset penetration strength to obtain penetration feedback strength;
detecting whether the penetration feedback intensity is less than 0;
when the penetration feedback strength is less than 0, setting the Teflon coating as a non-adaptive coating.
In this embodiment, when the brightness reduction of a certain winding sub-image is detected, in order to distinguish whether the brightness reduction is caused by a protrusion or a crack on the surface, the radio frequency receiving operation is performed on the region, for example, because the teflon coating is cylindrical, the radio frequency generator and the radio frequency receiver are placed on two sides of the teflon coating, and the radio frequency generator and the radio frequency receiver are symmetrically arranged by taking the central axis of the teflon coating as a symmetry axis. And the radio frequency generator sends out radio frequency signals to penetrate through a corresponding area on the Teflon coating, and the radio frequency receiver receives the radio frequency signals at the other side, so that the effective penetration strength of all the winding sub-images can be conveniently detected.
The preset penetration strength is used as the radio frequency effective penetration strength corresponding to no bulge or crack on the winding sub-image, namely the preset penetration strength is the standard radio frequency effective penetration strength, namely the surface of the teflon coating corresponding to the preset penetration strength is complete and has no bulge. The radio frequency effective penetration strength is compared with a preset penetration strength, namely, the penetration strength of the winding sub-image with reduced surface brightness is detected, the radio frequency effective penetration strength is the radio frequency effective penetration strength corresponding to the winding sub-image with reduced surface brightness, and the obtained penetration feedback strength is the difference value between the penetration strength of the current winding sub-image and the standard penetration strength. Thus, the penetration feedback strength is less than 0, which indicates that the radio frequency on the winding sub-image is blocked by penetration, i.e. the effective diameter of the corresponding area of the current winding sub-image is increased, i.e. the brightness of the current teflon coating is reduced due to the protrusion, so that the brightness of the teflon coating with reduced brightness is further determined to be the protrusion.
In another embodiment, for the case that the penetrating feedback strength is greater than or equal to 0, all winding sub-images with reduced surface brightness need to be detected, and only when the penetrating feedback strength corresponding to all winding sub-images with reduced surface brightness is greater than or equal to 0, the teflon coating can be positioned to be the adaptive coating, so that the teflon coating which is only cracked and is adaptive to the cell membrane is set to be the adaptive coating, and the teflon coating meeting the requirements is prevented from being mistakenly judged to be the non-adaptive coating. In this way, the available alternative usage amount of the adaptive teflon coating can be increased, and therefore the production cost of the battery cell can be reduced.
The application also provides a cell diaphragm needle removal device which is realized by adopting the Teflon coating adaptation detection method in any embodiment. In one embodiment, the cell membrane needle removal device is provided with functional modules corresponding to the steps of the teflon coating adaptation detection method. The battery core diaphragm needle removal device comprises a base, a diaphragm winding assembly, a diaphragm needle removal assembly and an adaptive detection assembly; the diaphragm winding assembly comprises a rotating motor, a diaphragm winding needle and a Teflon coating, the rotating motor is arranged on the base, the Teflon coating is located on the diaphragm winding needle, the diaphragm winding needle is connected with an output shaft of the rotating motor, and the Teflon coating is used for winding the battery core diaphragm; the diaphragm needle-removing assembly comprises a needle-removing device and a telescopic motor, the telescopic motor is connected with the base, an output shaft of the telescopic motor is connected with the needle-removing device, the telescopic motor is used for pushing the needle-removing device, and the needle-removing device is used for clamping a wound battery core diaphragm; the adaptive detection assembly comprises a pressure collector and a friction coefficient processor, and the pressure collector is connected with the friction coefficient processor; the pressure collector is used for acquiring a needle release pulling force value and a needle release pressure value of the needle release device; the friction coefficient processor is used for carrying out pretreatment operation on the needle release pulling force value and the needle release pressure value to obtain a needle release friction line quantity; and the friction coefficient processor is also used for selecting a Teflon coating matched with the battery core diaphragm according to the needle-off friction dimension. In this embodiment, through the comparison of the needle withdrawal tension value and the needle withdrawal pressure value, the friction coefficient between the teflon coating and the battery core diaphragm is obtained, that is, the needle withdrawal friction dimension is obtained, and then the required teflon coating is judged according to the needle withdrawal friction dimension, and the friction coefficients between various teflon coatings and the battery core diaphragm can be obtained only by rubbing corresponding materials, so that the friction coefficient of the teflon coating adapted to the battery core diaphragm can be determined quickly, and is not required to be determined by winding the battery core diaphragm, furthermore, the type of the teflon coating adapted to the battery core diaphragm is limited, all the teflon coatings are not required to be detected, and the adaptation time of the teflon coating is reduced.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. An electrical core diaphragm needle removal device, comprising:
a base seat, a plurality of fixing holes and a plurality of fixing holes,
the diaphragm winding assembly comprises a rotating motor, a diaphragm winding needle and a Teflon coating, the rotating motor is arranged on the base, the Teflon coating is positioned on the diaphragm winding needle, the diaphragm winding needle is connected with an output shaft of the rotating motor, and the Teflon coating is used for winding the battery core diaphragm;
the diaphragm needle-releasing assembly comprises a needle releasing device and a telescopic motor, the telescopic motor is connected with the base, an output shaft of the telescopic motor is connected with the needle releasing device, the telescopic motor is used for pushing and pulling the needle releasing device, and the needle releasing device is used for clamping a wound battery cell diaphragm;
the adaptive detection assembly comprises a pressure collector and a friction coefficient processor, and the pressure collector is connected with the friction coefficient processor; the pressure collector is used for acquiring a needle release pulling force value and a needle release pressure value of the needle release device; the friction coefficient processor is used for carrying out pretreatment operation on the needle release pulling force value and the needle release pressure value to obtain a needle release friction line quantity; and the friction coefficient processor is also used for selecting a Teflon coating matched with the battery core diaphragm according to the needle-off friction dimension.
2. The method for detecting the adaptation of the teflon coating of the cell membrane needle removal device according to claim 1, characterized by comprising:
acquiring a needle release pulling force value and a needle release pressure value of a needle release device, wherein the needle release pressure value is a positive pressure between a Teflon coating and a battery core diaphragm;
carrying out pretreatment operation on the needle release pulling force value and the needle release pressure value to obtain a needle release friction line quantity;
selecting a Teflon coating adaptive to the battery core diaphragm according to the needle-off friction dimension;
the step of carrying out pretreatment operation on the needle release pulling force value and the needle release pressure value to obtain needle release friction line quantity comprises the following steps: carrying out ratio value obtaining operation on the needle release pulling force value and the needle release pressure value, namely obtaining a ratio value of the maximum value and the minimum value of the needle release pulling force value and the needle release pressure value to obtain a needle release friction coefficient interval;
the method for selecting the Teflon coating adaptive to the battery core diaphragm according to the needle-off friction dimension comprises the following steps: acquiring the friction coefficient between the battery core diaphragm and each Teflon coating; and selecting a Teflon coating corresponding to the adaptive friction coefficient according to the needle-off friction coefficient interval.
3. The method for detecting the adaptation of the Teflon coating according to claim 2, wherein the step of selecting the Teflon coating corresponding to the adapted friction coefficient according to the needle-off friction coefficient interval comprises the following steps:
detecting whether the friction coefficient is matched with the needle release friction coefficient interval or not;
and when the friction coefficient is matched with the needle-off friction coefficient interval, selecting a Teflon coating corresponding to the friction coefficient.
4. The teflon coating fitting detection method of claim 3, wherein the needle release friction coefficient interval comprises a first needle release friction coefficient and a second needle release friction coefficient, and the detecting whether the friction coefficient matches the needle release friction coefficient interval comprises:
detecting whether the friction coefficient is larger than or equal to the first needle withdrawal friction coefficient and whether the friction coefficient is smaller than or equal to the second needle withdrawal friction coefficient;
when the friction coefficient is matched with the needle-off friction coefficient interval, selecting a Teflon coating corresponding to the friction coefficient, wherein the selecting comprises the following steps:
and when the friction coefficient is greater than or equal to the first pin removal friction coefficient and the friction coefficient is less than or equal to the second pin removal friction coefficient, setting the Teflon coating corresponding to the friction coefficient as a fitting coating.
5. The teflon coating fit detection method of claim 4, wherein the detecting whether the friction coefficient is greater than or equal to the first pin-out friction coefficient and the friction coefficient is less than or equal to the second pin-out friction coefficient further comprises:
and when the friction coefficient is smaller than the first needle release friction coefficient, setting the Teflon coating corresponding to the friction coefficient as an easy-to-slide coating.
6. The teflon coating fit detection method of claim 4, wherein the detecting whether the friction coefficient is greater than or equal to the first pin-out friction coefficient and the friction coefficient is less than or equal to the second pin-out friction coefficient further comprises:
and when the friction coefficient is larger than the second needle release friction coefficient, setting the Teflon coating corresponding to the friction coefficient as an easy-to-block coating.
7. The teflon coating adaptation detection method according to any one of claims 2 to 6, wherein the obtaining of the needle release pressure value of the needle release device comprises:
acquiring a clamping force value of the needle release device;
and carrying out pressure conversion operation on the clamping force value to obtain the needle release pressure value.
8. The teflon coating adaptation detection method of claim 7, wherein the performing of the pressure conversion operation on the clamping force value to obtain the needle release pressure value comprises:
acquiring a film winding and pressing value of the battery core diaphragm;
and obtaining the needle release pressure value according to the clamping force value and the rolled film rolling pressure value.
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