CN117747752A - Pole piece structure, coating pressing groove processing method and device - Google Patents
Pole piece structure, coating pressing groove processing method and device Download PDFInfo
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- CN117747752A CN117747752A CN202311500196.6A CN202311500196A CN117747752A CN 117747752 A CN117747752 A CN 117747752A CN 202311500196 A CN202311500196 A CN 202311500196A CN 117747752 A CN117747752 A CN 117747752A
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- pole piece
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- piece substrate
- current collector
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- 238000000576 coating method Methods 0.000 title claims abstract description 67
- 239000011248 coating agent Substances 0.000 title claims abstract description 66
- 238000003825 pressing Methods 0.000 title claims abstract description 25
- 238000003672 processing method Methods 0.000 title claims abstract description 18
- 239000000758 substrate Substances 0.000 claims abstract description 87
- 238000005096 rolling process Methods 0.000 claims abstract description 73
- 239000000463 material Substances 0.000 claims abstract description 22
- 238000001035 drying Methods 0.000 claims abstract description 18
- 239000002002 slurry Substances 0.000 claims abstract description 17
- 238000003303 reheating Methods 0.000 claims abstract description 14
- 239000010410 layer Substances 0.000 claims description 51
- 239000011149 active material Substances 0.000 claims description 42
- 238000010438 heat treatment Methods 0.000 claims description 28
- 230000007246 mechanism Effects 0.000 claims description 26
- 239000012790 adhesive layer Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052744 lithium Inorganic materials 0.000 abstract description 6
- 238000001556 precipitation Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000006378 damage Effects 0.000 description 7
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000007765 extrusion coating Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
Abstract
The invention belongs to the technical field of electrode core electrode plates, and particularly relates to a electrode plate structure, a coating pressing groove processing method and equipment; the coating groove pressing processing method of the pole piece structure comprises the following steps: coating active slurry on a current collector to obtain a pole piece substrate; preheating the pole piece base material to enable the pole piece base material to be in a preset humidity state; rolling the pole piece substrate in a preset humidity state; and reheating and drying the rolled pole piece substrate. The invention can obtain the pole piece structure with better surface uniformity and stability, which is beneficial to avoiding or reducing the phenomenon of lithium precipitation and improving the energy of the battery cell when in use; thereby improving the production and processing efficiency.
Description
Technical Field
The invention belongs to the technical field of electrode core electrode plates, and particularly relates to a electrode plate structure, a coating pressing groove processing method and equipment.
Background
Since commercialization, most of the used pole pieces of lithium ion batteries are prepared by pulping by adopting a wet process, coating the slurry on a current collector, and finally drying.
Most of the existing pole piece structures need to carry out a laser drilling process on the surface of the pole piece after being coated; however, the damage to the surface of the polar plate is serious, and a certain heat affected zone can be generated to a certain extent; and the shape consistency of the grooves on the surface of the pole piece after laser burning is poor, and the electric performance consistency among different electric cores is greatly influenced during mass production.
Disclosure of Invention
The invention aims at: aiming at the defects of the prior art, the pole piece structure, the coating pressing groove processing method and the coating pressing groove processing equipment are provided, and the purpose of improving the stability of the pole piece structure and guaranteeing the use safety is achieved.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a coating pressing groove processing method of a pole piece structure comprises the following steps:
coating active slurry on a current collector to obtain a pole piece substrate;
preheating the pole piece base material to enable the pole piece base material to be in a preset humidity state;
rolling the pole piece substrate in a preset humidity state;
and reheating and drying the rolled pole piece substrate.
Preferably, the step of coating the active slurry on the current collector to obtain the pole piece substrate comprises the following steps:
conveying the current collector to a coating die head through a conveying roller set mechanism;
a coating die with active paste was used to uniformly coat along the current collector to obtain the pole piece substrate.
Preferably, the step of preheating the pole piece substrate to make the pole piece substrate in a preset humidity state includes the following steps:
incremental preheating treatment is carried out on the pole piece base material; the incremental preheating temperature is increased along the deep direction of the conveying of the pole piece substrate; and the value range of the preheated temperature T1 is as follows: t1 is more than or equal to 50 ℃ and less than or equal to 150 ℃.
Preferably, the value range of the duration t of preheating the pole piece substrate is as follows: t is more than or equal to 4s and less than or equal to 8s;
and/or the preset humidity state is a state that the humidity content of the active slurry in the active material layer reaches 0.5-50% RH.
Preferably, the step of rolling the pole piece substrate in a preset humidity state comprises the following steps:
carrying out rolling treatment on the pole piece substrate in a preset humidity state by using at least two rolling convex strips on a grooved roll structure so as to form at least one rolling groove on the pole piece substrate;
the rolling grooves and the planes of the pole piece base material in the thickness direction are obliquely arranged.
Preferably, the temperature range of the reheating drying temperature T2 of the reheating and drying treatment satisfies the following conditions: t2 is less than or equal to 170 ℃ and is more than 150 ℃.
The invention also discloses a pole piece structure, which is manufactured by a coating pressing groove processing method based on the pole piece structure; and the pole piece structure comprises a pole piece substrate; the pole piece substrate comprises a current collector and an active material layer arranged on at least one surface of the current collector; at least one rolling groove is also formed in the pole piece substrate; the rolling grooves extend along the direction of the active material layer towards the current collector and are arranged inside the active material layer; and the rolling grooves are disposed obliquely to a plane in which the thickness direction of the active material layer is located.
Preferably, the width M of the rolling groove satisfies: m= (0.01-100) mm;
and/or the relation between the thickness H1 of the active material layer and the thickness H2 of the rolling groove satisfies: h1 And (3) not less than H2.
The invention also discloses a coating press groove processing device of the pole piece structure, which is used for executing the coating press groove processing method of the pole piece structure; the coating pressing groove processing equipment of the pole piece structure comprises a conveying roller set mechanism, a coating die head and a rolling heating mechanism; the conveying roller set mechanism is used for conveying the pole piece substrate or the current collector; the coating die head and the rolling heating mechanism are sequentially arranged along the conveying direction of the conveying roller set mechanism; the coating die head is used for coating active slurry on the current collector to form the pole piece substrate; the rolling heating mechanism comprises a first heating component, a grooved roll structure and a second heating component which are sequentially arranged along the conveying direction; the structure of the grooved roll is provided with at least two rolling raised strips, and the rolling raised strips are used for carrying out rolling treatment on the pole piece base material;
the rolling convex strips are arranged in parallel, and are obliquely arranged with the horizontal plane where the grooved roll structure is located.
Preferably, the grooved roll structure comprises an inner supporting layer and an outer non-adhesive layer arranged on the surface of the inner supporting layer, wherein the outer non-adhesive layer is used for carrying out rolling treatment on the pole piece substrate and is non-reactive with the active material layer of the pole piece substrate.
The method has the beneficial effects that the active slurry is coated on the current collector to obtain the pole piece substrate, so that preparation is made for subsequent pressing groove processing, and the smoothness of processing is improved; then preheating the pole piece substrate to enable the pole piece substrate to be in a preset humidity state so as to form a semi-cured active material layer, so that the phenomena of splashing and the like of the active material layer on a coated current collector can be avoided, convenience and smoothness of subsequent rolling operation can be facilitated, processing difficulty is reduced, and processing efficiency is improved; then rolling the pole piece substrate in a preset humidity state, so as to obtain a rolling groove which is more uniform and has better structural stability; finally, the rolled pole piece substrate is heated and dried again, so that a pole piece structure with better surface uniformity and stability is obtained, the pole piece structure is favorable for avoiding or reducing the phenomenon of lithium precipitation, and the energy of the battery cell is improved when the pole piece structure is used; thereby improving the production and processing efficiency.
Drawings
Features, advantages, and technical effects of exemplary embodiments of the present invention will be described below with reference to fig. 1 to 5.
FIG. 1 is a flow chart of a method of coating a slot die for pole piece construction according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a coating press according to an embodiment of the present invention;
FIG. 3 is a schematic diagram showing the structure of a grooved roll of a coating grooved roll apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic view of a pole piece substrate according to an embodiment of the present invention;
fig. 5 is an enlarged view of a portion of a pole piece substrate according to an embodiment of the present invention.
In the figure: 100-a conveying roller set mechanism; 200-coating a die; 400-pole piece base material; 410-current collector; 420-an active material layer; 430-rolling grooves; 500-rolling and heating mechanism; 510-reheating the zone; 511-a second heating element; 520-a roll-in zone; 530—a preheating zone; 531-a first heating component; 600-grooved roll structure; 601-an inner support layer; 602-no adhesive layer outside; 610-rolling the raised strips; 620-fitting gap.
Detailed Description
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 application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions.
In the description of the embodiments of the present application, the technical terms "first," "second," etc. are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
In the description of the embodiments of the present application, the term "and/or" is merely a pole piece structure, a coating and pressing method, and an apparatus describing an association relationship of associated objects, which means that three relationships may exist, for example, a and/or B may mean: a alone, both a and B, and a plurality of cases alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are in a relationship of a pole piece structure, a coating and slot-pressing method and apparatus or.
In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural sheets" refers to two or more (including two).
In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the embodiments of the present application and for simplifying the description, rather than indicating or implying that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.
In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to the specific circumstances.
The present invention will be described in further detail with reference to fig. 1 to 5, but the present invention is not limited thereto.
As shown in fig. 1, in an embodiment of the present invention, the pole piece structure is coated by a slot-pressing method; the method comprises the following steps:
s1, coating active slurry on a current collector to obtain a pole piece substrate;
s2, preheating the pole piece base material to enable the pole piece base material to be in a preset humidity state;
s3, rolling the pole piece substrate in a preset humidity state;
and S4, reheating and drying the rolled pole piece substrate.
According to the technical scheme, the active slurry is coated on the current collector to obtain the pole piece substrate, so that preparation is made for subsequent groove pressing processing, and the smoothness of processing is improved; then preheating the pole piece substrate to enable the pole piece substrate to be in a preset humidity state so as to form a semi-cured active material layer, so that the phenomena of splashing and the like of the active material layer on a coated current collector can be avoided, convenience and smoothness of subsequent rolling operation can be facilitated, processing difficulty is reduced, and processing efficiency is improved; then rolling the pole piece substrate in a preset humidity state, so as to obtain a rolling groove which is more uniform and has better structural stability; finally, the rolled pole piece substrate is heated and dried again, so that a pole piece structure with better surface uniformity and stability is obtained, the pole piece structure is favorable for avoiding or reducing the phenomenon of lithium precipitation, and the energy of the battery cell is improved when the pole piece structure is used; thereby improving the production and processing efficiency.
Specifically, in some embodiments, in S1, the step of applying the active slurry to the current collector to obtain the pole piece substrate includes the following steps:
delivering the current collector 410 to the coating die 200 by the delivery roller set mechanism 100;
the electrode sheet substrate 400 is uniformly coated along the surface of the current collector 410 using a coating die 200 with an active paste. As shown in fig. 2, the number of coating dies 200 is at least two, and the coating dies are respectively disposed on two surfaces of the current collector 410 that are disposed opposite to each other. Wherein the coating dies 200 are arranged in a staggered manner. That is, when the current collector 410 is conveyed to the coating die 200 by the conveying roller set mechanism 100, the upper and lower surfaces of the current collector 410 are coated with the active paste by the coating dies 200 disposed alternately, respectively, to form the active material layer 420. The structure can avoid extrusion coating deformation of the current collector 410 in the coating process by the dislocation coating mode, so that the structural stability of the pole piece substrate 400 can be ensured.
Wherein in some embodiments, the pole piece substrate 400 may be one of an anode pole piece substrate or a cathode pole piece substrate. Further, in some embodiments, the pole piece substrate 400 is an anode pole piece.
Specifically, in some embodiments, in S2, the step of pre-heating the pole piece substrate to make the pole piece substrate in a preset humidity state includes the following steps:
incremental preheating treatment is carried out on the pole piece base material; the incremental preheating temperature is increased along the deep direction of the conveying of the pole piece substrate; and the value range of the preheated temperature T1 is as follows: t1 is more than or equal to 50 ℃ and less than or equal to 150 ℃. Wherein the preheating treatment of the preheating area 530 (wherein the conveying length of the preheating area 530 is 10-90% of the total conveying length of the rolling heating mechanism 500) of the pole piece substrate in the rolling heating mechanism 500 is performed with incremental preheating temperature. That is, the active material layer can be effectively prevented from being damaged by the sudden high temperature by the gradually increasing preheating temperature, and the safety of use is improved. Wherein the increased preheating may take the form of an initial temperature of 50 ℃ or 60 ℃ or 70 ℃ followed by an increase in temperature of 10 ℃ or 15 ℃ or 20 ℃ per second as the pole piece substrate proceeds in the direction of transport. Preliminary solidification of the active material layer can be ensured through reasonable preheating, and loss or damage is avoided, so that the smoothness and efficiency of processing are effectively improved.
Specifically, in some embodiments, in S2, the value range of the duration t of preheating the pole piece substrate is: t is more than or equal to 4s and less than or equal to 8s. Preferably, the time period t=7s; preliminary solidification of the active material layer can be ensured through preheating for a reasonable time, and loss or damage is avoided, so that the smoothness and efficiency of processing are effectively improved.
Specifically, in some embodiments, the preset humidity state is a state in which the humidity content of the active slurry in the active material layer reaches 0.5% rh to 50% rh. The primary solidification of the active material layer can be ensured by the active material layer 420 having a moisture content of 0.5% rh to 50% rh, avoiding the occurrence of loss or destruction. When the moisture content is less than 0.5% rh, the active material layer 420 may excessively wet to flow to the side end of the current collector 410 or drop out, thereby causing loss of material and also affecting the stability and safety of the use of the electrode sheet substrate 400. When the moisture content is more than 50% rh, the state of the active material layer 420 is substantially shaped, thereby causing excessive hardness, which in turn requires excessive rolling, and also damaging the current collector 410 itself, affecting the stability and safety of the use of the pole piece substrate 400.
Specifically, in some embodiments, in S3, the step of performing roll-pressing treatment on the pole piece substrate in a preset humidity state includes the following steps:
the pole piece substrate 400 in a preset humidity state is subjected to rolling treatment by using at least two rolling convex strips 610 on the grooved roller structure 600, so that at least one rolling groove 430 is formed on the pole piece substrate; as shown in fig. 2, the rolling grooves 430 are disposed obliquely to a plane in which the thickness direction of the pole piece substrate 400 is located. The pole piece substrate is roll treated in roll zone 520 of roll heating mechanism 500. That is, the structural stability of the pole piece substrate 400 can be effectively improved, the dynamic performance can be improved, and the occurrence of the lithium precipitation phenomenon can be effectively avoided or reduced by the formed inclined rolling grooves 430. As shown in fig. 4, the rolling grooves 430 are disposed obliquely to the plane of the YZ axis.
Specifically, in some embodiments, in the step of reheating and drying the rolled pole piece substrate in S4, the temperature range of the reheating and drying temperature T2 satisfies the following conditions: t2 is less than or equal to 170 ℃ and is more than 150 ℃. The reheating and drying temperature T2 with the value range of 150 ℃ to less than or equal to 170 ℃ can avoid damage to the active material layer and the rolling grooves 430 caused by overlarge temperature, thereby improving the use stability and safety.
The invention also provides a pole piece structure which is manufactured based on the pole piece structure coating pressing groove processing method, and specific steps of the pole piece structure coating pressing groove processing method refer to the above embodiments.
Wherein, as shown in fig. 4, the pole piece structure comprises a pole piece substrate 400; the pole piece substrate 400 includes a current collector 401 and an active material layer 420 disposed on at least one surface of the current collector 410; the pole piece substrate 400 is also provided with at least one rolling groove 430; the rolling grooves 430 are disposed inside the active material layer 420 to extend in a direction of the active material layer 420 toward the current collector 410; and the rolling grooves 430 are disposed obliquely to a plane in which the thickness direction of the active material layer 420 is located. That is, as shown in fig. 4, the rolling grooves 430 are disposed obliquely to the plane in which the YZ axis lies. The structural stability of the pole piece substrate 400 can be effectively improved, the dynamic performance of the pole piece substrate is improved, and the occurrence of the phenomenon of lithium precipitation is effectively avoided or reduced through the formed inclined rolling grooves 430.
Specifically, in some embodiments, as shown in fig. 5, the length of the roll grooves 430 extends through the entire pole piece substrate 400; and the width M of the rolling groove 430 satisfies: m= (0.01 to 100) mm. The structure can improve the structural stability of the active material layer and avoid the phenomena of fracture and the like.
Specifically, in some embodiments, as shown in fig. 5, the relationship between the thickness H1 of the active material layer 420 and the thickness H2 of the rolling grooves 430 satisfies: h1 And (3) not less than H2. Preferably, h1=h2; that is, the rolling grooves 430 penetrate through the active material layer 420 and extend to the surface of the current collector 410, so that the stability of the contact reaction between the current collector and the electrolyte can be ensured, and the lithium precipitation phenomenon can be effectively avoided; the safety and stability of the use are improved.
The invention also provides a coating and pressing groove processing device of the pole piece structure, the coating and pressing groove processing of the pole piece structure uses the coating and pressing groove processing method of the pole piece structure, and the specific steps of the coating and pressing groove processing method of the pole piece structure refer to the above embodiment.
Wherein, as shown in fig. 2, the coating and pressing groove processing equipment of the pole piece structure comprises a conveying roller group mechanism 100, a coating die head 200 and a rolling and heating mechanism 500; the conveying roller set mechanism 100 comprises at least three conveying rollers, wherein two conveying rollers are arranged in parallel, and the conveying rollers are used for conveying the pole piece substrate 400 or the current collector 410; the coating die 200 and the roll heating mechanism 500 are sequentially arranged along the conveying direction of the conveying roller; coating die 200 is used to coat current collector 410 with an active slurry to form pole piece substrate 400; the roll heating mechanism 500 includes a first heating member 531, a grooved roll structure 600, and a second heating member 511, which are sequentially arranged along the conveying direction; at least two rolling raised strips 610 are arranged on the grooved roller structure 600; the rolling raised strips 610 are disposed parallel to each other and inclined to the horizontal plane of the grooved roll structure 600. In some embodiments, the first heating component 531 is a first heating and drying group pipe, and the preheating temperature T1 of the first heating and drying group pipe has a range of values: t1 is more than or equal to 50 ℃ and less than or equal to 150 ℃; the second heating part 511 is a second heating and drying group pipe, and the reheating and drying temperature T2 of the second heating and drying group pipe has a range of values: t2 is more than 150 ℃ and less than or equal to 170 ℃; preferably, t2=160 ℃. The structure can ensure the smoothness and stability of rolling operation and avoid the deformation or damage of the active material layer 420 by preheating T1 to ensure that the moisture content of the slurry of the active material layer 420 on the pole piece substrate 400 reaches the range of 0.5-50% RH. Meanwhile, the reheating and drying temperature T2 with the value range of 150 ℃ to less than or equal to 170 ℃ can avoid damage to the active material layer and the rolling grooves 430 caused by overlarge temperature, thereby improving the stability and safety of use.
Specifically, in some embodiments, as shown in fig. 2 and 3, the grooved roll structure 600 includes an inner support layer 601 and an outer non-adhesive layer 602 disposed on a surface of the inner support layer 601, the outer non-adhesive layer 602 being used for roll-processing the pole piece substrate 400 and being non-reactive with the active material layer 420 of the pole piece substrate 400. Wherein the outer non-adhesive layer 602 is made of teflon and other materials; the inner support layer 601 is made of tungsten steel or the like. That is, by the inner support layer 601 of tungsten steel or the like and the outer non-adhesive layer 602 which does not fuse or react with the active material layer, stability and smoothness of rolling of the pole piece substrate 400 can be ensured, operations such as adhesion and adsorption of the active material layer can be avoided, and integrity and stability of the pole piece substrate 400 can be ensured.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the embodiments of the disclosure may be suitably combined to form other embodiments as will be understood by those skilled in the art.
Variations and modifications of the above embodiments will occur to those skilled in the art to which the invention pertains from the foregoing disclosure and teachings. Therefore, the present invention is not limited to the above-described embodiments, but is intended to be capable of modification, substitution or variation in light thereof, which will be apparent to those skilled in the art in light of the present teachings. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present invention in any way.
Claims (10)
1. A coating pressing groove processing method of a pole piece structure is characterized by comprising the following steps of: the method comprises the following steps:
coating active slurry on a current collector to obtain a pole piece substrate;
preheating the pole piece base material to enable the pole piece base material to be in a preset humidity state;
rolling the pole piece substrate in a preset humidity state;
and reheating and drying the rolled pole piece substrate.
2. The coating press-slot processing method of the pole piece structure according to claim 1, characterized in that: the step of coating the active slurry on the current collector to obtain the pole piece substrate comprises the following steps:
conveying the current collector to a coating die head through a conveying roller set mechanism;
a coating die with active paste was used to uniformly coat along the current collector to obtain the pole piece substrate.
3. The coating press-slot processing method of the pole piece structure according to claim 1, characterized in that: the step of preheating the pole piece base material to enable the pole piece base material to be in a preset humidity state comprises the following steps:
incremental preheating treatment is carried out on the pole piece base material;
the incremental preheating temperature is increased along the deep direction of the conveying of the pole piece substrate; and the value range of the preheated temperature T1 is as follows: t1 is more than or equal to 50 ℃ and less than or equal to 150 ℃.
4. A method of coating a slot die of a pole piece construction according to claim 1 or 3, characterized in that: the value range of the duration t of preheating the pole piece substrate is as follows: t is more than or equal to 4s and less than or equal to 8s;
and/or the preset humidity state is a state that the humidity content of the active slurry in the active material layer reaches 0.5-50% RH.
5. The coating press-slot processing method of the pole piece structure according to claim 1, characterized in that: the step of rolling the pole piece substrate in a preset humidity state comprises the following steps of:
carrying out rolling treatment on the pole piece substrate in a preset humidity state by using at least two rolling convex strips on a grooved roll structure so as to form at least one rolling groove on the pole piece substrate;
the rolling grooves and the planes of the pole piece base material in the thickness direction are obliquely arranged.
6. The coating press-slot processing method of the pole piece structure according to claim 1, characterized in that: the reheating and drying temperature T2 temperature range of the reheating and drying treatment meets the following conditions: t2 is less than or equal to 170 ℃ and is more than 150 ℃.
7. A pole piece structure, characterized in that: a coating slot die process based on the pole piece structure of any one of the preceding claims 1 to 6; and the pole piece structure comprises a pole piece substrate; the pole piece substrate comprises a current collector and an active material layer arranged on at least one surface of the current collector; at least one rolling groove is also formed in the pole piece substrate; the rolling grooves extend along the direction of the active material layer towards the current collector and are arranged inside the active material layer; and the rolling grooves are disposed obliquely to a plane in which the thickness direction of the active material layer is located.
8. The pole piece structure of claim 7, wherein: the width M of the rolling groove meets the following conditions: m= (0.01-100) mm;
and/or the relation between the thickness H1 of the active material layer and the thickness H2 of the rolling groove satisfies: h1 And (3) not less than H2.
9. Coating indent processing equipment of pole piece structure, its characterized in that: a coating slot die process for performing the pole piece structure of any one of the preceding claims 1 to 6; the coating pressing groove processing equipment of the pole piece structure comprises a conveying roller set mechanism, a coating die head and a rolling heating mechanism; the conveying roller set mechanism is used for conveying the pole piece substrate or the current collector; the coating die head and the rolling heating mechanism are sequentially arranged along the conveying direction of the conveying roller set mechanism; the coating die head is used for coating active slurry on the current collector to form the pole piece substrate; the rolling heating mechanism comprises a first heating component, a grooved roll structure and a second heating component which are sequentially arranged along the conveying direction; the structure of the grooved roll is provided with at least two rolling raised strips, and the rolling raised strips are used for carrying out rolling treatment on the pole piece base material;
the rolling convex strips are arranged in parallel, and are obliquely arranged with the horizontal plane where the grooved roll structure is located.
10. The coating press of pole piece construction as claimed in claim 9, wherein: the grooved roll structure comprises an inner supporting layer and an outer non-adhesive layer arranged on the surface of the inner supporting layer, wherein the outer non-adhesive layer is used for carrying out rolling treatment on the pole piece base material and does not react with the active material layer of the pole piece base material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311500196.6A CN117747752A (en) | 2023-11-10 | 2023-11-10 | Pole piece structure, coating pressing groove processing method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311500196.6A CN117747752A (en) | 2023-11-10 | 2023-11-10 | Pole piece structure, coating pressing groove processing method and device |
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