CN112658489B - Method for removing active substances of pole piece - Google Patents
Method for removing active substances of pole piece Download PDFInfo
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- CN112658489B CN112658489B CN202011595031.8A CN202011595031A CN112658489B CN 112658489 B CN112658489 B CN 112658489B CN 202011595031 A CN202011595031 A CN 202011595031A CN 112658489 B CN112658489 B CN 112658489B
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Abstract
The invention provides a method for removing active substances of a pole piece, which is characterized in that the active substance layer of the pole piece in a pre-removing area is thinned to a preset thickness by at least twice laser to form a reserved layer, so that the light pressure can be effectively reduced, the damage of a current collector is reduced, and the removing precision and the precision for forming the reserved layer are improved. And then the reserved layer is removed by a physical cleaning method to expose the current collector of the pole piece in the pre-removing area, so that the damage of the current collector is further reduced, and the product yield is improved.
Description
Technical Field
The invention relates to the field of batteries, in particular to a method for removing active substances of a pole piece.
Background
When the lithium ion battery is prepared, the general process of the manufacturing process is as follows: an active material, a binder, a conductive agent and the like are mixed to prepare active material slurry, then the slurry is coated on a copper or aluminum current collector, the active material slurry coated on the two surfaces of the current collector is dried, and then the active material layer is compacted by rolling. The tab is used as a positive and negative electrode leading-out piece of the battery core and needs to be contacted with the current collector, so that the active substance layer is removed at the position of the tab connected to the pole piece to form a groove, and then the current collector is exposed, so that the tab is convenient to arrange and the current collector is convenient to contact. This recess is used for holding utmost point ear, and utmost point ear is the metallic conductor who draws forth positive negative pole from electric core, and to welding utmost point ear, the recess that is used for holding utmost point ear is indispensable.
At present, the method for forming the groove mainly comprises the steps of removing the foaming glue and removing the groove by laser.
The scheme for removing the foaming glue is as follows: before the current collector is coated with active substances, the foaming adhesive is arranged at the position of a pole piece where a pole lug is pre-welded, then the current collector and the foaming adhesive are coated with the active substances, and the foaming adhesive and the active substances on the foaming adhesive are removed, so that a groove is formed at the position of the pole lug which is pre-welded. However, the method needs to use the foaming glue as a consumable material, so that the cost is high; in addition, the tolerance of the groove formed by adopting the foaming glue is relatively large.
The laser clearing scheme is as follows: after the current collector is coated with active substances to form a pole piece, the position of a pole lug which is pre-welded on the pole piece is irradiated by laser, and the active substances at the position are removed to form a groove. However, the laser removes active substances and simultaneously avoids damage to the current collector, so that the current collector is oxidized and embrittled.
Disclosure of Invention
The present invention is directed to solving one of the technical problems of the prior art. Therefore, the invention provides a method for removing pole piece active substances, which reduces the damage of a current collector.
The invention provides a method for removing active substances of a pole piece, which comprises the following steps:
thinning the active substance layer of the pole piece in the pre-clearing area to a preset thickness by at least two times of laser to form a reserved layer;
and clearing the reserved layer by a physical clearing method to expose the current collector of the pole piece in the pre-clearing area.
In one embodiment, the step of thinning the active material layer of the pole piece in the pre-cleaning region to a predetermined thickness by at least two times of laser to form a reserved layer includes:
obtaining the residual thickness of the active material layer before thinning the active material layer of the pole piece in the pre-clearing area by laser each time;
determining the removal thickness according to the residual thickness, the preset thickness and a preset rule, wherein the preset rule is as follows: if T2 is greater than 2.5T1, then T3 is less than or equal to T2-2T 1; if 2 × T1 ≦ T2 ≦ 2.5 × T1, then T3= T2-T1; wherein T1 is the predetermined thickness, T2 is the residual thickness, and T3 is the removal thickness;
removing the active material according to the removal thickness.
In one embodiment, the determining a removal thickness according to the residual thickness and the predetermined thickness and a predetermined rule comprises:
the removal thickness is positively correlated to the remaining thickness of the active material layer.
In one embodiment, after removing the active material according to the removal thickness, the method further includes:
and dedusting the pre-cleaning area.
In one embodiment, said dusting said pole piece comprises:
and removing dust from the pre-cleaning area by a suction method or a blowing method.
In one embodiment, the obtaining the remaining thickness and the predetermined thickness of the active material layer includes:
and estimating the residual thickness of the active material layer of the pole piece in the pre-clearing area according to the gray value of the pole piece in the pre-clearing area.
In one embodiment, the predetermined thickness is 15 μm to 25 μm.
In an embodiment, the removing the reserved layer by a physical cleaning method to expose the current collector of the pole piece in the pre-removal area includes:
the physical clearing method is a brushing method.
In an embodiment, after the removing the reserved layer by a physical cleaning method to expose the current collector of the pole piece in the pre-removal area, the method further includes:
and removing dust of the current collector by a sticking method.
In one embodiment, the pole piece is a positive pole piece.
In summary, the invention provides a method for removing active materials from a pole piece, wherein the active material layer of the pole piece in a pre-removal area is thinned to a predetermined thickness by at least two times of laser to form a reserved layer, so that the light pressure can be effectively reduced, the damage of a current collector is reduced, and the removal precision and the precision for forming the reserved layer are improved. And then the reserved layer is removed by a physical cleaning method to expose the current collector of the pole piece in the pre-removing area, so that the damage of the current collector is further reduced, and the product yield is improved.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a flow diagram of one embodiment of a method of removing pole piece active material in accordance with the present invention;
FIG. 2 is a schematic diagram of a pole piece before the first laser irradiation in the embodiment of FIG. 1;
FIG. 3 is a schematic diagram of the pole piece after the first laser irradiation in the embodiment of FIG. 1;
FIG. 4 is a schematic diagram of the pole piece after the second laser irradiation in the embodiment of FIG. 1;
fig. 5 is a schematic diagram of the pole piece after the reserved layer is removed by a physical removal method in the embodiment of fig. 1.
Reference numerals:
t1-predetermined thickness;
t2 — remaining thickness of active material layer in pre-erase region, total thickness of active material layer in T21 pre-erase region, T22-thickness of active material layer in pre-erase region after previous laser erase;
t3-removal thickness, T31-removal thickness of first laser, T32-removal thickness of second laser;
10-pole piece, 11-active material layer in pre-clearing area, 13-current collector, 15-reserved layer.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Before the embodiments are described in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangements of components set forth in the following description or illustrated in the drawings. The invention is capable of embodiments in other forms of implementation. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of "including," "comprising," "having," and the like, herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. In particular, when "a certain element" is described, the present invention is not limited to the number of the element being one, and may include a plurality of the elements.
In the invention, the active substance layer of the pole piece in the pre-clearing area is thinned to a preset thickness by at least two times of laser to form a reserved layer.
The pre-cleaning area is selected according to requirements, such as the area needing to weld the tab. The active material layer of the pole piece in the pre-removing area is thinned through laser, namely, the active material layer in the pre-removing area is irradiated through laser, active material particles are excited by laser energy to expand, the active material expands fiercely along with the fact that more laser energy is absorbed by the active material particles, so that the active material particles are overcome the adhesion force, are separated from the active material layer, and are even vaporized and ablated, and the thickness of the active material layer in the pre-removing area is reduced. Specifically, the more the active material particles closer to the outer layer absorb the more laser energy, the more the laser energy, the more deeply the active material particles will be excited to loosen and even detach from the active material layer.
The predetermined thickness is set according to the characteristics of the active material, for example, the positive active material is lithium cobaltate, the lithium cobaltate is spherical particles, the particle size of the lithium cobaltate is 5-12 μm, preferably, the predetermined thickness is 15-25 μm, gaps exist among the lithium cobaltate particles, the predetermined thickness is 15-25 μm, at least two lithium cobaltate layers can be arranged in the reserved layer, the lithium cobaltate layer far away from the current collector can largely cover the gaps in the lithium cobaltate layer close to the current collector, damage caused by irradiation of laser to the current collector through the gaps of the current collector can be effectively prevented, and the current collector is easy to clean. It should be understood that the predetermined thickness of 15 μm to 25 μm is only one embodiment of the present invention, and in other embodiments, the predetermined thickness may be adjusted according to the characteristics of the active material, as long as the current collector is prevented from being damaged by the laser irradiation through the reserved layer, and the present invention does not limit the setting of the predetermined thickness.
Compared with the method that the active material layer is thinned to the reserved layer only by one laser, the method gradually removes the active material by at least two laser irradiation until the remaining active material forms the reserved layer with the preset thickness. The laser energy of laser can be reduced, the light pressure is reduced, the current collector damage caused by the fact that active material particles close to the current collector generate indentations on the current collector is reduced, and the situation that the active material particles close to the current collector are embedded into the current collector to cause difficulty in clearing is also prevented. Secondly, because the laser energy is small, even a small amount of laser irradiates the current collector through the gaps among the active material particles, the current collector is not seriously damaged. And thirdly, the clearing precision of the active substance and the precision of forming a reserved layer are effectively improved.
In one embodiment, the residual thickness of the active material layer is obtained before each laser thinning the active material layer of the pole piece in the pre-cleaning area. The residual thickness is a variable value, and the residual thickness is the thickness of the active material layer at the time of the laser irradiation, that is, the residual thickness is the total thickness of the active material layer at the time of the first laser irradiation, and the residual thickness is the thickness of the active material layer after the previous laser removal at the time of the other laser irradiation.
In this embodiment, before the active material layer of the pole piece in the pre-cleaning region is thinned by each laser, the remaining thickness of the active material layer is obtained, the cleaning thickness of the active material layer to be cleaned by the laser irradiation is determined according to the remaining thickness of the active material layer, the predetermined thickness and the predetermined rule, the laser energy of the laser is determined according to the cleaning thickness, and the active material cleaned by the laser irradiation on the active material layer is used to reduce the thickness of the active material layer by the cleaning thickness.
Specifically, the predetermined rule is: if T2 is greater than 2.5T1, then T3 is less than or equal to T2-2T 1; if 2 × T1 ≦ T2 ≦ 2.5 × T1, then T3= T2-T1; wherein T1 is the predetermined thickness, T2 is the residual thickness, and T3 is the removal thickness.
The reserved layer is formed after the active material layer is thinned by at least two times of laser, and if the laser energy of the last laser is too large, the reserved layer is damaged, and the current collector is damaged. If the laser energy of the last laser is too small, the reserved layer cannot be loosened, and the reserved layer is difficult to remove by a physical removal method. In order to ensure that the formed reserved layer is loosened and active material particles in the reserved layer cannot be separated from the pole piece, the removal thickness of the active material layer reduced by the last laser is limited to be 1 to 1.5 times of the preset thickness, namely if 2T 1 is not less than T2 is not less than 2.5T1, T3= T2-T1, and T1 is not less than T3 is not less than 1.5T 1. The laser energy of last laser is limited, the precision of forming the reserved layer is improved, active substance particles in the reserved layer cannot be separated from the pole piece, the reserved layer is made to be loose, and the current collector is easy to clear and effectively protected.
By acquiring the residual thickness of the active material layer in real time, if the residual thickness of the active material layer of the pole piece in the pre-clearing area is greater than 2.5 times of the preset thickness by the secondary laser, controlling the clearing thickness of the secondary laser to enable the residual thickness of the thinned secondary laser to be greater than 2 times of the preset thickness, namely if T2 is greater than 2.5T1, T3 is not greater than T2-2T 1. In the art, the total thickness of the active material layer of the pole piece is generally greater than 2.5 times the predetermined thickness (15 μm to 25 μm), and if the remaining thickness of the active material layer is less than 2.5 times the predetermined thickness, i.e., T2 ≦ 2.5 × T1, the remaining thickness of the active material layer may be guaranteed to be greater than or equal to 2 times the predetermined thickness, as defined by the previously laser thinned removal thickness (i.e., if T2 > 2.5 × T1, T3 ≦ T2-2 × T1), thereby ensuring that the last laser reduced the removal thickness of the active material layer by 1 to 1.5 times the predetermined thickness (i.e., if 2T 1 ≦ T2 ≦ 2.5 × T1, T3= T2-T1, T1 ≦ T3 ≦ 1.5T 1), improving the precision of forming the reserve layer and loosening the reserve layer, while the active material particles in the reserve layer are not easily removed and protecting the current collector.
The active material layer can be thinned to a preset thickness with the residual thickness of 2 to 2.5 times only by one laser, namely if T2 is more than 2.5T1, then 2T 1 is more than or equal to T3 is more than or equal to T2-2T 1, the active material layer in the pre-clearing area can be thinned to the preset thickness only by two lasers, on the basis of ensuring that the reserved layer is not damaged, the active material can be cleared as much as possible, and the efficiency of clearing the active material layer is improved. It should be understood that if T2 > 2.5 × T1, then T1 ≦ T3 ≦ T2-2 × T1, which is only an embodiment of the present invention, if the total thickness of the active material layer is too large, the active material layer is thinned to a predetermined thickness of 2 to 2.5 times the remaining thickness only by one laser, and the laser energy of this laser is too large, so that a large optical pressure is generated, and further the current collector is indented, and part of the active material particles close to the current collector are embedded in the current collector, so that the reserved layer is difficult to be removed, and in other embodiments, at least two lasers are used to thin the active material layer of the pole piece in the pre-removal area to a predetermined thickness of 2 to 2.5 times the remaining thickness, so that the laser energy is reduced, and further the optical pressure is reduced, so that the damage to the current collector is reduced, so that the reserved layer is easier to be removed. The invention adopts laser for several times to thin the active material layer of the pole piece in the pre-cleaning area to the preset thickness with the residual thickness of 2 to 2.5 times without limitation, and only needs to thin the active material layer of the pole piece in the pre-cleaning area to the preset thickness by at least twice laser to form a reserved layer.
In this embodiment, the remaining thickness of the active material layer of the pole piece in the pre-clearing area is estimated according to the gray value of the pole piece in the pre-clearing area. The current collector is made of metal (generally copper or aluminum) with light reflecting property, and the gray value of the pole piece can reflect the thickness of the active material layer on the premise of fixing the intensity of the light source. For example, different thicknesses of the active material layer and corresponding gray values thereof are tested offline, a corresponding relation between the thickness of the active material layer and the gray values is established, a gray detection CCD is used to collect the current gray values of the active material layer during application, and then the remaining thickness of the active material layer is obtained according to the corresponding relation between the thickness and the gray values obtained offline. It should be understood that this is only one embodiment of the present invention, and in other embodiments, the remaining thickness of the active material layer may be obtained in other manners, such as directly measuring the remaining thickness of the active material layer, and the present invention is not limited to the manner of determining the remaining thickness of the active material layer.
In this embodiment, the removal thickness is positively correlated with the remaining thickness of the active material layer, that is, the larger the remaining thickness of the active material layer is, the larger the laser energy set by the laser beam is, and the smaller the remaining thickness of the active material layer is as the active material is removed by successive laser, the smaller the laser energy of the laser beam is. The residual thickness of the active material layer is gradually reduced to reduce the laser energy, so that the damage of the current collector can be effectively avoided, and the formation of a reserved layer with preset thickness is effectively ensured.
In this embodiment, after the active material layer is irradiated with laser each time to remove the active material, the active material is separated from the active material layer by vaporization, ablation, and expansion to form dust (fly ash or floating dust).
Further, the active material layer is subjected to dust removal by either a suction method or a blowing method. The suction method and the blowing method take away flying dust in air or floating dust falling on the pole piece through air flow, and both the suction method and the blowing method can not contact the pole piece to cause damage and can effectively remove dust. It should be understood that the dust removal of the active material layer by the suction method or the blowing method is an embodiment of the present invention, and in other embodiments, the dust removal may be performed by other dust removal methods, such as the adhesion method, but the present invention is not limited thereto as long as the dust removal of the active material layer is effectively performed.
Preferably, the pole piece is a positive pole piece. The current collector of the positive electrode sheet is typically an aluminum foil, and the active material is spherical particles, such as lithium cobaltate; while the current collector of the negative electrode sheet is usually a copper foil, the active material is a sheet-like structure, such as graphite. Compared with a copper foil, the aluminum foil is lower in melting point and easy to damage by laser, gaps are inevitably formed among positive active material particles, laser energy of single laser can be reduced by performing laser thinning at least twice, the thickness of a reserved layer is accurately controlled, the reserved layer is removed by a cleaning method, damage to the aluminum foil is effectively reduced, and large-area oxidation and embrittlement of a current collector are prevented. The copper foil of the negative plate has better tolerance to laser, and the graphite with the sheet structure can effectively prevent the laser from directly irradiating the negative plate, so that the negative active material can be directly removed from the negative plate through the laser without a combination cleaning method for improving the production efficiency. It should be understood that the pole piece is a positive pole piece only as an embodiment of the present invention, and the negative pole piece adopting the method of the present invention can still further avoid the current collector from being damaged, and ensure the quality of the current collector after cleaning, which is not limited by the present invention.
In the invention, after the active material layer of the pole piece in the pre-clearing area is thinned to the preset thickness T1 by at least two times of laser to form a reserved layer, the reserved layer is cleared by a physical clearing method to expose the current collector of the pole piece in the pre-clearing area.
The reserved layer can be removed to expose the current collector by physical removal methods such as brushing, scraping, erasing, adhering and the like. Compared with the method of clearing the reserved layer by adopting laser, clearing the reserved layer by a physical clearing method does not damage the current collector, and the reserved layer is loosened because the active substance layer is excited by laser energy and can be easily cleared by the physical clearing method. Preferably, clear away through the brushing method and reserve the layer and expose the mass flow body, the brush is softer, and is littleer to the damage of mass flow body, clears away more thoroughly, and the residue is few.
As a further improvement of the invention, after the active substance layer is removed by a physical removal method to expose the current collector in the pre-removal area, the pole piece is dedusted by any one of an absorption method, a blowing method or a sticking method, the absorption method and the blowing method are used for taking away flying dust in air or floating dust falling on the pole piece by air flow, and the absorption method and the blowing method can not contact the pole piece to cause damage and can effectively remove dust. And for the pre-cleaning area, a sticking method is preferably adopted, residues on the current collector can be more thoroughly cleaned by adopting the sticking method, and if the pre-cleaning area is used for subsequently welding the electrode lug, the welding quality can be improved.
In conclusion, the mode of combining the laser thinning method and the physical clearing method at least twice is adopted, so that the active material layer in the pre-clearing area can be cleared quickly on one hand, and the current collector can be prevented from being damaged on the other hand. The processing precision is improved, the production beat is accelerated, and the product yield is improved.
An embodiment of the method for removing active material from a pole piece according to the present invention is described with reference to fig. 1 to 5, and the specific steps are as follows.
S101: according to requirements, a pre-clearing area is selected on the pole piece 10, and a preset thickness T1 is set.
In the embodiment, the predetermined thickness T1 is 15 μm to 25 μm, and the predetermined thickness T1 of the reserved layer 15 is defined to be 15 μm to 25 μm, so that damage to the current collector 13 due to laser irradiation on the current collector 13 can be effectively prevented, and the reserved layer 15 is easy to remove.
S102: the remaining thickness T2 of active material layer 11 of pole piece 10 in the pre-cleared area was measured.
In this embodiment, the residual thickness T2 of the active material layer 11 of the pole piece 10 in the pre-clearance area is estimated according to the gray level value of the pole piece 10 in the pre-clearance area, and at this time, the active material layer 11 is not irradiated by any laser, so the residual thickness T2 is the total thickness T21 of the active material layer 11. The current collector 13 is made of a metal (typically copper or aluminum) with light reflecting characteristics, the gray value of the electrode plate 10 changes with the thickness of the active material layer 11, and the thickness of the active material layer 11 can be reflected by the gray value of the electrode plate 10. For example, the different thicknesses of the active material layer and the corresponding gray values thereof are tested offline, the corresponding relationship between the thickness of the active material layer and the gray values is established, the gray value of the active material layer 11 is collected by using a gray detection CCD during application, and the total thickness T21 of the active material layer 11 is obtained according to the corresponding relationship between the thickness and the gray value obtained offline. It should be understood that this is only one embodiment of the present invention, and in other embodiments, the thickness information of active material layer 11 may be obtained in other manners, such as directly measuring the thickness of active material layer 11, and the present invention is not limited to the manner of determining total thickness T21 of active material layer 11.
S103: and determining the removal thickness T31 of the first laser according to the residual thickness T2 (total thickness T21) of the active material layer 11 of the pole piece 10 in the pre-removal area, the preset thickness T1 and a preset rule, and setting the laser energy of the first laser according to the removal thickness T31 of the first laser.
The first laser removal thickness T31 may be as large as possible, but should ensure the quality of the reserved layer 15 and effectively protect the current collector 13. In the embodiment, the total thickness T21 of the active material layer is greater than 2.5 times of the predetermined thickness T1, the active material layer 11 of the pole piece 10 in the pre-cleaning region is thinned to the predetermined thickness T1 by two times of laser to form the reserved layer 15, and the thickness T22 of the active material layer after the first laser cleaning is 2 times to 2.5 times of the predetermined thickness T1, so that T31 is greater than or equal to T21-2.5T1, and T31 is less than or equal to T21-2T 1. It should be understood that, in order to improve the efficiency of removing the active material from the pole piece, only two times of lasers are used to thin the active material layer 11 to a predetermined thickness T1, such that T31 is greater than or equal to T21-2.5 × T1, and T31 is less than or equal to T21-2 × T1, but this is only an embodiment of the present invention, and a larger laser energy may have a larger optical pressure and poor control accuracy, in other embodiments, more than two times of lasers may be used to remove the active material layer from the pole piece in the pre-removal region, and the removal thickness T31 of the first laser is less than T21-2.5T1, which is not limited in this respect.
S104: the active material layer 11 in the pre-cleaning area is subjected to thinning treatment by irradiating the pole piece 10 with primary laser.
And setting the first laser according to a removal thickness T31 which is preset to enable the active material layer 11 of the pole piece 10 in the pre-removal area to be reduced in the first laser irradiation, so that the active material with the removal thickness T31 in the active material layer 11 of the pre-removal area is removed by the pole piece 10 in a certain time through the laser energy output by the first laser.
S105: the remaining thickness T2 of active material layer 11 of pole piece 10 in the pre-cleared area was measured.
In this step, the residual thickness T2 is the active material layer thickness after the first laser removal T22= T21-T31. Preferably, after the active material is removed by the laser for the first time, the pole piece 10 is dedusted, so that the influence of dust on the quality of the pole piece can be prevented, and the measurement precision of the residual thickness T2 can be improved.
S106: the removal thickness T32 of the second laser is determined according to the residual thickness T2 (the thickness T22 of the active material layer after the first laser removal) of the active material layer 11 of the pole piece 10 in the pre-removal area and the preset thickness T1, and the laser energy of the second laser is set according to the removal thickness T32 of the second laser.
In this embodiment, the last laser reduces the removal thickness of the active material layer 11 to 1.5 times of the predetermined thickness T1, which can improve the precision of forming the reserved layer 15, and make the reserved layer 15 loose, and the active material particles in the reserved layer 15 will not be separated, so as to easily remove and effectively protect the current collector 13. Since T22-T1 is not more than 1.5T1, and T22-T1 is not less than T1, the active material layer 11 can be thinned to the predetermined thickness T1 through the second laser to form the reserved layer 15, the second laser is the last laser, and the removal thickness T32 of the second laser is 1-1.5 times of the predetermined thickness T1.
S107: and irradiating the active material layer 11 of the pole piece 10 in the pre-clearing area by the second laser to thin the active material layer to a preset thickness T1 to form a reserved layer 15.
Similarly, the second laser is set according to its removal thickness T32.
S108: the reserve layer 15 is removed by a brushing method to expose the current collector 13.
In this embodiment, adopt the brush to remove the brush of reservation layer 15, compare in directly adopting laser to clear away reservation layer 15, clear away reservation layer 15 through the brush and can not harm the mass flow body 13, and because the active material of reservation layer 15 receives laser energy to arouse and produce the inflation, reservation layer 15 produces not hard up, can easily clear away reservation layer 15 through the brush, clears away more thoroughly, and the residue is few. And residues on the current collector 13 can be thoroughly removed by a sticking method, so that the quality of subsequent tab welding can be improved.
In summary, the invention provides a method for removing active materials from a pole piece, wherein the active material layer of the pole piece in a pre-removal area is thinned to a predetermined thickness by at least two times of laser to form a reserved layer, so that the light pressure can be effectively reduced, the damage of a current collector is reduced, and the removal precision and the precision for forming the reserved layer are improved. And then the reserved layer is removed by a physical cleaning method to expose the current collector of the pole piece in the pre-removing area, so that the damage of the current collector is further reduced, and the product yield is improved.
The concepts described herein may be embodied in other forms without departing from the spirit or characteristics thereof. The particular embodiments disclosed should be considered illustrative rather than limiting. The scope of the invention is, therefore, indicated by the appended claims rather than by the foregoing description. Any changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (8)
1. A method for removing active substances from a pole piece is characterized by comprising the following steps:
thinning the active substance layer of the pole piece in the pre-clearing area to a preset thickness by at least two times of laser to form a reserved layer;
removing the reserved layer by a physical removing method to expose the current collector of the pole piece in the pre-removing area;
wherein the step of thinning the active material layer of the pole piece in the pre-clearing area to a preset thickness by at least twice laser to form a reserved layer comprises the following steps:
obtaining the residual thickness of the active material layer before thinning the active material layer of the pole piece in the pre-clearing area by laser each time;
determining a removal thickness according to the residual thickness, the preset thickness and a preset rule;
removing the active material according to the removal thickness;
and the predetermined rule is: if T2 is greater than 2.5T1, then T3 is less than or equal to T2-2T 1; if 2 × T1 ≦ T2 ≦ 2.5 × T1, then T3 ═ T2-T1, such that the last laser light reduced the active material layer by the removal thickness that is 1 to 1.5 times the predetermined thickness, where T1 is the predetermined thickness, T2 is the residual thickness, and T3 is the removal thickness;
the predetermined thickness is 15 μm to 25 μm.
2. The method of removing pole piece active material of claim 1, wherein said determining a removal thickness based on said residual thickness and said predetermined thickness and predetermined rules comprises:
the removal thickness is positively correlated to the remaining thickness of the active material layer.
3. The method for removing active material from a pole piece according to claim 1, further comprising, after removing active material according to the removal thickness:
and dedusting the pre-cleaning area.
4. The method for removing pole piece active material according to claim 3, wherein said dusting said pole piece comprises:
and removing dust from the pre-cleaning area by an absorption method or a blowing method.
5. The method for removing pole piece active material of claim 1, wherein said obtaining the remaining thickness and the predetermined thickness of the active material layer comprises:
and estimating the residual thickness of the active material layer of the pole piece in the pre-clearing area according to the gray value of the pole piece in the pre-clearing area.
6. The method for removing pole piece active material according to claim 1, wherein the removing the reserved layer to expose the current collector of the pole piece in the pre-removal area by a physical removal method comprises:
the physical clearing method is a brushing method.
7. The method for removing pole piece active material according to claim 1, wherein the removing the reserved layer by physical removal to expose the current collector of the pole piece in the pre-removing area further comprises:
and removing dust of the current collector by a sticking method.
8. The method for removing active substances from a pole piece according to any one of claims 1 to 7, wherein the pole piece is a positive pole piece.
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| CN112038565B (en) * | 2020-07-23 | 2022-02-08 | 深圳市比亚迪锂电池有限公司 | Pole piece slotting method and device |
| CN113843189B (en) * | 2021-08-11 | 2022-11-22 | 惠州市豪鹏科技有限公司 | Method for removing pole piece coating |
| CN117984598A (en) * | 2024-04-03 | 2024-05-07 | 耀能新能源(赣州)有限公司 | Overvoltage-preventing lithium battery pole piece rolling device and method |
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