CN113130839A - Preparation method of battery pole piece, die head gasket and battery - Google Patents
Preparation method of battery pole piece, die head gasket and battery Download PDFInfo
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- CN113130839A CN113130839A CN202110394551.0A CN202110394551A CN113130839A CN 113130839 A CN113130839 A CN 113130839A CN 202110394551 A CN202110394551 A CN 202110394551A CN 113130839 A CN113130839 A CN 113130839A
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
- B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
- B05C5/0245—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work for applying liquid or other fluent material to a moving work of indefinite length, e.g. to a moving web
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/26—Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
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- 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
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- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention relates to the technical field of batteries, in particular to a preparation method of a battery pole piece, a die head gasket and a battery, wherein the preparation method comprises the following steps: forming a pole piece to be treated by coating slurry on the surface of a current collector moving along a first direction, wherein the pole piece to be treated comprises a coating area and non-coating areas positioned on two sides of the coating area in a second direction perpendicular to the first direction, the coating area comprises edge thinning areas positioned on edge areas on two sides of the coating area, a depressed area positioned in the middle area of the coating area and a normal coating area positioned between the depressed area and the edge thinning areas, and the coating surface densities of the edge thinning areas and the depressed area are lower than those of the normal coating area; and cutting the pole piece to be processed from the depressed area of the coating area along the first direction to obtain the target pole piece. By utilizing the technical scheme, the battery pole piece can be prepared by a simple, convenient, efficient and low-cost method.
Description
Technical Field
The invention belongs to the technical field of batteries, and particularly relates to a preparation method of a battery pole piece, a die head gasket and a battery.
Background
This section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.
The lithium ion battery has the characteristics of high energy density, long cycle life, environmental protection and the like, and is widely applied to the fields of automobiles, consumer electronics products, energy storage and the like. The process of laterally leading out the tabs is widely adopted in the current battery, and in the prior art, in order to prepare the battery pole piece of the process of laterally leading out the tabs and effectively avoid lithium precipitation after the battery pole piece is assembled into the battery, a complex preparation procedure with high cost is generally required.
Disclosure of Invention
Aiming at the problems in the prior art, the preparation method of the battery pole piece, the die head gasket and the battery are provided, and the technical problem that a simple, convenient, efficient and low-cost preparation method is lacked can be solved by utilizing the scheme.
The present invention provides the following.
The invention provides a preparation method of a battery pole piece, which comprises the following steps: forming a pole piece to be treated by coating slurry on the surface of a current collector moving along a first direction, wherein the pole piece to be treated comprises a coating area and non-coating areas positioned on two sides of the coating area in a second direction perpendicular to the first direction, the coating area comprises edge thinning areas positioned on edge areas on two sides of the coating area, a depressed area positioned in the middle area of the coating area and a normal coating area positioned between the depressed area and the edge thinning areas, and the coating surface densities of the edge thinning areas and the depressed area are lower than those of the normal coating area; and cutting the pole piece to be processed from the depressed area of the coating area along the first direction to obtain the target pole piece.
The technical scheme has the following advantages or beneficial effects: the battery pole piece with low coating surface density of the edge areas at two sides and a non-coating area at one side can be prepared by a simple, efficient and low-cost method, and lithium precipitation can be effectively avoided after the battery pole piece is assembled into a battery.
In a second aspect of the present invention, there is provided a die shim for carrying out the production method according to the first aspect, the die shim comprising: the gasket body is provided with a discharge hole and is used for coating slurry on the surface of the current collector to form a coating area; the edge thinning parts are arranged at the edges of the two sides of the discharge port and are used for reducing the coating surface density of the edge thinning area of the coating area; and the middle thinning part is arranged in the middle of the discharge port and used for reducing the coating surface density of the depressed area of the coating area.
The technical scheme has the following advantages or beneficial effects: the die head gasket has a simple structure, and can be coated on a current collector to generate a normal coating area, an edge thinning area and a depressed area by adopting the coating device comprising the die head gasket, and the edge thinning area and the depressed area have lower coating surface density than the normal coating area, so that the preparation of the battery pole piece in the first aspect is realized efficiently, simply and conveniently at low cost.
In a third aspect of the present invention, there is provided a battery comprising: the formed battery pole piece is manufactured using the method of the first aspect.
The technical scheme has the following advantages or beneficial effects: the thinning area of the positive plate corresponds to the thinning area of the negative plate, the normal coating area of the positive plate corresponds to the normal coating area of the negative plate, the risk of lithium precipitation at the edge of the battery can be effectively avoided, and the preparation process of the positive and negative battery plates of the battery is simple, convenient, efficient and low in cost.
It should be understood that the above description is only an overview of the technical solutions of the present invention, so as to clearly understand the technical means of the present invention, and thus can be implemented according to the content of the description. In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
The advantages and benefits described herein, as well as other advantages and benefits, will be apparent to those of ordinary skill in the art upon reading the following detailed description of the exemplary embodiments. The drawings are only for purposes of illustrating exemplary embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like elements throughout. In the drawings:
FIG. 1 is a schematic flow chart of a method for manufacturing a battery electrode sheet according to an embodiment of the present invention;
FIG. 2 is a schematic view of a coating of a battery pole piece according to an embodiment of the invention;
FIG. 3A is a schematic structural diagram of a pole piece to be processed according to an embodiment of the invention;
FIG. 3B is a schematic diagram of a target pole piece according to an embodiment of the invention;
FIG. 4A is a schematic structural diagram of a pole piece to be processed according to an embodiment of the invention;
FIG. 4B is a schematic structural diagram of a pole piece to be processed according to another embodiment of the present invention;
FIG. 4C is a schematic structural diagram of a target pole piece according to another embodiment of the invention;
FIG. 5 is a schematic view of a stacked structure of battery pole pieces according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a pole piece to be processed according to another embodiment of the present invention;
FIG. 7 is a schematic diagram of a die shim according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a die shim according to another embodiment of the present invention.
In the drawings, the same or corresponding reference numerals indicate the same or corresponding parts.
Reference numerals: (11, 11b) -a first normal coating zone; (12, 12b) -a second normal coating zone; (13, 13a, 13b) -a first edge thinning region; (14, 14a, 14b) -a second edge thinning region; (15, 15b) -recessed regions; 151-first recessed region; (16, 16b) -a first non-coated region; (17, 17b) -a second non-coated area; 18-a first tangent line; 19-a second tangent line; 20-a gasket body; 21-edge thinning; 22-intermediate thinning; 23-discharge port, 24-lip; 25-clearance; 31-positive plate; 32-negative plate; 41-a first edge; 42-a second edge; 301-upper die; 302-lower mould; 303-die shim; 304-a drive roller; 305-a current collector; 306-pole piece to be processed.
Detailed Description
The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which like reference numerals refer to like elements throughout. In this regard, the present embodiments may have different forms and should not be construed as limited to the descriptions set forth herein. Accordingly, the disclosed embodiments are described below to illustrate aspects, only by referring to the figures. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. The expression "at least one of" when preceding or following a list of elements modifies the entire list of elements and does not modify individual elements of the list.
It will be understood that, although the terms "first," "second," "third," etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a "first element," "component," "region," "layer" or "portion" discussed below could be termed a second element, component, region, layer or portion without departing from the teachings herein.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, including "at least one", unless the content clearly indicates otherwise. "at least one" is not to be construed as limiting "one". "or" means "and/or". As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, regions, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, components, and/or groups thereof.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Exemplary embodiments are described herein with reference to cross-sectional views that are schematic illustrations of idealized embodiments. As such, deviations from the shapes of the figures as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, the embodiments described herein should not be construed as limited to the particular shapes of regions as illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, regions illustrated or described as flat may typically have rough and/or non-linear features. Further, the illustrated sharp corners may be rounded. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the precise shape of a region and are not intended to limit the scope of the present claims.
The embodiment of the application aims to provide a simple, convenient, efficient and low-cost battery pole piece preparation method, and the prepared battery pole piece can effectively avoid lithium precipitation after being assembled into a battery.
Various non-limiting embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Firstly, preparation of battery pole pieceMethod
Fig. 1 shows a flowchart of a method for manufacturing a battery pole piece according to an embodiment of the present application, fig. 2 shows a coating schematic diagram of a battery pole piece, fig. 3A shows a schematic diagram of a pole piece to be processed according to an embodiment of the present application, and fig. 3B shows a schematic diagram of a target pole piece according to an embodiment of the present application. The production method is specifically described below with reference to fig. 1, fig. 2, fig. 3A, and fig. 3B.
Referring to fig. 1, the preparation method may include the following steps S101 to S102:
and S101, coating slurry on the surface of the current collector moving along the first direction to form a pole piece to be processed.
The above S101 shows a pole piece coating step. Fig. 2 shows a schematic coating diagram of a pole piece, wherein a die pad 303 is disposed between an upper die 301 and a lower die 302 of a coating die, and a driving roller 304 drives a current collector 305 to move along a first direction a, which is the advancing direction of the current collector 305. As indicated by the arrows in fig. 2, the first direction a includes a direction a1 entering the driving roller 304, a clockwise rotation direction a2 at the periphery of the driving roller 304, and a direction A3 exiting from the driving roller 304, wherein the current collector 305 attached to the periphery of the driving roller 304 moves along the first direction a2, and the current collector 305 exiting from the driving roller 304 moves along the first direction A3. The coating die extrudes the coating slurry through die shim 303 toward current collector 305 to form a pending pole piece 306.
Fig. 3A shows a top view of all or part of the pole piece to be treated obtained after performing the pole piece coating step of S101, referring to fig. 3A, where arrow a indicates a first direction and arrow B indicates a second direction perpendicular to the first direction, i.e. the coating width direction (the discharge width direction of the coating). In the second direction B, the pole piece to be treated is formed to include a coated area and a first non-coated area 16 and a second non-coated area 17 located on both sides of the coated area. The non-coated region refers to a region of the surface of the current collector that is not coated with the slurry. Alternatively, the slurry may refer to an active material slurry.
More specifically, the coating region specifically includes a first edge thinning region 13 and a second edge thinning region 14 located at both side edge regions, a depressed region 15 located at a middle region, a first normal coating region 11 located between the first edge thinning region 13 and the depressed region 15, and a second normal coating region 12 located between the second edge thinning region 14 and the depressed region 15, wherein the coating area density of the edge thinning regions (13, 14) and the depressed region 15 of the coating region is lower than that of the normal coating regions (11, 12) of the coating region. The coating surface density refers to a slurry weight parameter in unit area, and a specific coating surface density value can be specifically set according to different pole piece designs.
It can be understood that after the pole piece coating step of S101 is completed, conventional pole piece processing procedures such as drying, rolling, and the like need to be performed on the generated pole piece to be processed to enhance the bonding strength of the living matter and the current collector, which is not described in detail herein.
S102, cutting the pole piece to be processed from the depressed area 15 of the coating area along the first direction to obtain a target pole piece.
The above step S102 shows a pole piece slitting step, and referring to fig. 3A as well, for example, the target pole piece shown in fig. 3B can be obtained by slitting with the center line of the recessed area 15 in the second direction B as the first dividing line 18. It can be seen that the two side edges of the pole piece coating area of the target pole piece obtained by slitting are respectively the first edge thinning area 13 (i.e. the first thinning area) and the first depressed area 151 (i.e. the second thinning area) obtained by slitting the depressed area 15, and between the two side edges is the first normal coating area 11, the coating surface density of the first thinning area and the second thinning area is lower than that of the first normal coating area 11, and only one side of the first thinning area and the second depressed area is provided with the first non-coating area 16.
In this embodiment, the slitting position in S102 is not limited to the center line of the depressed area, and the surface density distribution of the first thinned area and the second thinned area of the battery pole piece obtained by slitting can be approximately symmetrically arranged with respect to the center line of the pole piece coating area, specifically, the difference in the coating surface density of the first thinned area and the second thinned area is within an allowable error range.
It is understood that a pole piece die cutting process can also be performed before, during or after the pole piece slitting step of S102 is performed to obtain a battery pole piece of a target size.
In the method for preparing a pole piece provided in the above embodiment, through the pole piece coating step in S101 and the pole piece slitting step in S102, a battery pole piece having regions with low areal density coated on both side edges and a non-coated region on one side can be prepared in a simple, efficient and low-cost manner, and lithium precipitation can be effectively avoided after the battery pole piece is assembled into a battery.
Alternatively, in S101, the edge thinning area, the depressed area and the normal coating area with different area densities may be coated on the surface of the current collector by thinning the slurry coating thickness of the edge thinning area and the depressed area of the coating area to form the pole piece to be processed. In the embodiment, the pole piece to be processed is formed by thinning the coating thickness of the slurry in certain designated areas, so that the pole piece to be processed can be formed in one-step forming without additional processing after the coating step.
Preferably, referring to fig. 4A, the thickness of the slurry applied to the edge thinning regions (13, 14) may be gradually reduced from the inner side to the edge, wherein the inner side is the side close to the normal application region, for example, in a gradient. The thickness of the slurry applied to the recessed region 15 may be gradually reduced from the two sides of the recessed region 15 in the second direction toward the inside, and the recessed region may be a V-like or U-like recess. Further, in S102, pole piece slitting may be performed at a position where the coating areal density of the depressed region 15 is the lowest, so that the first thinned region and the second thinned region on both sides of the target pole piece obtained by slitting are each gradually thinned from the inner side toward the edge.
Referring to fig. 3B, a target pole piece is shown whose pole piece coating area includes opposing first and second edges 41, 42 in a second direction B. One side of the first thinning-out region (the first edge thinning-out region 13 in fig. 3B) coincides with the first edge 41, and the other side is away from the first edge 41, and the slurry coating thickness of the first thinning-out region 41 gradually increases from the first edge 41 to the side of the first thinning-out region away from the first edge 41. One side of the second thinned region (the first recessed region 151 in fig. 3B) coincides with the second edge 42, and the other side is away from the second edge 42, and the slurry coating thickness of the second thinned region gradually increases from the second edge 42 to the side of the second thinned region away from the second edge 42. Preferably, the difference of the thickening gradients of the slurry coating thickness of the first thinning zone and the second thinning zone can be controlled to be kept within a preset error range. Therefore, the symmetry of the first thinning area and the second thinning area is improved, and the lithium precipitation condition of the manufactured target pole piece after the battery is assembled is further avoided by a simple preparation method.
In an embodiment, the slurry coating thickness of the first thinned region at the first edge 41 is less than the slurry coating thickness of the second thinned region at the second edge 42. Preferably, the thickness of the paste coating at the first edge of the first thinning zone is smaller than the thickness of the paste coating at the second edge of the second thinning zone within a preset difference range. It can be understood that, referring to fig. 4A, it is difficult to control the lowest slurry coating thickness of the recess region 15 to be completely equal to the slurry coating thickness (close to 0) of the first edge thinning region at the first edge due to the limitation of the manufacturing process, so that the manufacturing difficulty can be reduced by controlling the slurry coating thickness of the first thinning region at the first edge to be smaller than the slurry coating thickness of the second thinning region at the second edge within a preset difference range. Further, referring to fig. 4B and 4C, the target pole piece shown in fig. 4C can also be obtained after slitting fig. 4B by thickening the slurry coating thickness of the first edge thinning zone 13a and the second edge thinning zone 14a at the edges, and it can be seen that the slurry coating thickness at the edges of both sides is approximately equal, and the symmetry of the coating surface density at both sides of the target pole piece can be improved. In one embodiment, to further avoid the lithium deposition of the manufactured target electrode plate after the assembled battery, the lengths of the first thinned area and the second thinned area of the target electrode plate are equal in the second direction B.
Specifically, still referring to fig. 3B, at least a first and a second pole piece are obtained after slitting, and the recessed area 15 of the coated area is slit into a first recessed area 151 and a second recessed area (not shown); the first pole piece comprises a first normal coating area 11 with normal coating surface density, and a first thinning area and a second thinning area which are positioned at two sides of the first normal coating area 11 and have lower coating surface density, namely a first edge thinning area 13 and a first depressed area 151, wherein the first edge thinning area 13 and the first depressed area 151 are the same in length, so that the lithium precipitation condition of the manufactured target pole piece after the battery is assembled is avoided.
In an embodiment, referring to fig. 3A, a coating area symmetrically arranged along a first tangent line 18 is formed on the surface of the current collector, and the first tangent line 18 is a center line of the coating area in the second direction B; and cutting the pole piece to be processed along the first cutting line 18 to obtain a first pole piece and a second pole piece with the same size.
In an embodiment, referring to fig. 6, in order to prepare two sizes of battery pole pieces simultaneously, asymmetrically arranged coating regions may be further formed on the surface of the current collector, wherein the normal coating region includes a first normal coating region 11B and a second normal coating region 12B, the edge thinning region includes a first edge thinning region 13B and a second edge thinning region 14B, the first normal coating region 11B is located between the recessed region 15B and the first edge thinning region 13B, the second normal coating region 12B is located between the recessed region 15B and the second edge thinning region 14B, and the first normal coating region 11B and the second normal coating region 12B in the pole piece to be processed are formed to have different sizes in the second direction B. On the basis of the above, the pole piece to be processed is cut along the second tangent line 19 of the recessed area 15b, so as to obtain a third pole piece and a fourth pole piece with different sizes. This difference in size may indicate that the third and fourth pole pieces have different sized normal coating areas (11b, 12 b). Preferably, the lengths of the low-surface-density coating area and the normal coating area of the third pole piece and the fourth pole piece are different by controlling the slurry coating thickness parameters of the edge thinning area and the depressed area on two sides. Therefore, the battery pole pieces with two sizes can be simultaneously generated in one-step preparation process, the preparation efficiency is further improved, and the cost is saved.
In the description of the present specification, reference to the description of the terms "some possible implementations," "some embodiments," "an embodiment," "an example," "a specific example," or "some examples" or the like means 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 present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to 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. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Second, battery pole piece
Fig. 3B is a top view of a battery pole piece according to an embodiment of the invention. The battery pole piece provided by the embodiment of the invention is a positive battery pole piece or a negative battery pole piece prepared by executing the preparation method of the battery pole piece of any one of the embodiments. For example, referring to fig. 3B, the two side edges of the coating region of the battery pole piece are the first edge thinning region 13 and the first depressed region 151, respectively, both are low areal density coating regions, and between the two side edges are the first normal coating region 11, which is a normal areal density coating region, and only one of the sides has a non-coating region.
The battery pole piece provided by the embodiment can effectively avoid lithium precipitation after being assembled into a battery due to the fact that the two sides of the battery pole piece are respectively provided with the low-surface-density coating areas, and the battery pole piece is prepared by a simple, convenient, efficient and low-cost method.
Third, die head gasket
Fig. 7 is a schematic diagram of a die shim according to an embodiment of the present invention. The die shim is configured to perform the method of making a battery pole piece of any of the embodiments described above.
Referring to fig. 7, die shim 303 includes: the gasket body 20 is provided with a discharge hole 23, and the discharge hole is used for coating slurry on the surface of the current collector to form a coating area; edge thinning parts 21 provided at both side edges of the discharge port 23 to reduce the coating surface density of the edge thinning zone of the coating zone; and an intermediate thinning part 22 disposed at an intermediate position of the discharge port 23 to reduce the coating surface density of the depressed area 15 of the coating area.
After the pole piece coating step is performed by using a coating apparatus comprising the die shim shown in fig. 7, a top view of the pole piece to be treated as shown in fig. 3A can be obtained, wherein, in a direction perpendicular to the first direction a, the coating zone specifically comprises a first normal coating zone 11 and a second normal coating zone 12, a first edge thinning zone 13 and a second edge thinning zone 14 at both side edges, and a recessed zone 15 at a middle position, wherein the coating areal density of the edge thinning zones (13, 14) and the recessed zone 15 of the coating zone is lower than that of the normal coating zones (11, 12) of the coating zone. The coating surface density refers to a slurry weight parameter in unit area, and a specific coating surface density value can be specifically set according to different pole piece designs.
The die head gasket provided by the embodiment has a simple structure, and by adopting the coating device comprising the die head gasket, the edge thinning area and the depressed area which are lower in coating surface density compared with the normal coating area can be coated on the current collector, so that the preparation method of the battery pole piece described in the embodiment is realized efficiently, simply and conveniently at low cost.
In an embodiment, the intermediate thinning part 22 may be installed at the center line of the discharge port 23 of the gasket body 20, so that a coating area symmetrically arranged along the center line of the coating area may be formed on the surface of the current collector, and a plurality of target pole pieces with the same size may be cut after the pole piece coating step.
In one embodiment, the intermediate thinned portion 22 is mounted at a position offset from the center line of the discharge port 23 of the gasket body 20. It will be appreciated that in order to prepare two sizes of battery pole pieces simultaneously, the intermediate thinned portion 22 may be installed at a position offset from the center line of the discharge opening 23 of the gasket body 20, so as to form asymmetrically arranged coating regions on the surface of the current collector. And cutting the asymmetric pole piece to be processed to obtain a third pole piece and a fourth pole piece with different sizes. The lengths of the low surface density coating area and the normal surface density coating area of the generated third pole piece and the fourth pole piece are different by controlling the chamfering parameters of the middle thinning part and the edge thinning part. Therefore, the battery pole pieces with two sizes can be simultaneously generated in one-step preparation process, the preparation efficiency is further improved, and the cost is saved.
In one embodiment, referring to fig. 7, the intermediate thinned portion 22 includes a connection end connected to the gasket body 20 and a free end extending to the discharge port 23; wherein the free end of the intermediate thinning portion 22 is formed as a tip, such as a V-shaped tip, and there is no gap between the top of the tip and the lip 24 of the discharging hole 23. It is understood that, in an actual scenario, the slurry may be extruded from the lip 24 of the discharge port 23 and applied to the surface of the current collector facing the lip 24, where the lip 24 refers to a slit-shaped slurry outlet on the side of the discharge port 23 facing the current collector, for applying the slurry to the surface of the current collector. Thereby the thickness of the slurry coating in the depressed area of the coating area is reduced to be close to 0 at the lowest.
In other embodiments, referring to fig. 8, the intermediate thinned portion 22 includes a connection end connected to the gasket body 20 and a free end extending to the discharge port 23; wherein, there is the clearance 25 between the lip 24 of discharge gate 23 and the top of the free end of middle skiving portion 22, can make the minimum thick liquids coating thickness of the depressed area of coating region the same with the size of clearance 25 from this, and the die head gasket simple structure, and the size is easily controlled, is convenient for large-scale production and use.
Alternatively, the edge thinning portion may adopt a conventional thinning structure such as a chamfer, and the present application is not particularly limited thereto.
In one embodiment, the attachment end of the intermediate thinned portion 22 is removably attached to the shim body 20. In this embodiment, by using the intermediate thinning portion 22 detachably mounted on the shim body, the existing shim body 20 can be used without separately preparing the die shim, and the intermediate thinning portion can be detached and replaced at any time according to the required thinning thickness parameter of the depressed region 15 without replacing the shim body, reducing waste of resources.
In other embodiments, the connecting end of the intermediate thinning portion may also be fixedly mounted on the gasket body, possibly avoiding loosening of parts.
Fourth, the battery
Fig. 5 is a schematic structural diagram of a battery according to an embodiment of the present invention. One or more positive plates 31 and negative plates 32 are prepared by the preparation method of the battery pole piece according to any one of the embodiments, and the positive plates 31 and the negative plates 32 are stacked together in a manner shown in fig. 5, wherein the low areal density coating regions on both sides of the positive plates face the low areal density coating regions on both sides of the negative plates, and at this time, the N/P ratio is not too small, so that the risk of lithium precipitation at the edge of the battery is effectively solved.
It can be understood that the excess ratio of the negative electrode capacity to the positive electrode capacity of the battery per unit area is referred to as N/P for short, and the N/P is too small, so that the lithium separation phenomenon is easy to occur in the battery core, and the electrical property is influenced.
The battery may be a lithium ion battery of a stacked and/or wound battery, which is not particularly limited in this application.
The N/P ratio of the positive and negative battery pole pieces of the battery provided by the embodiment is not too small, the risk of lithium precipitation at the edge of the battery is effectively avoided, and the preparation process of the positive and negative battery pole pieces of the battery is simple, convenient, efficient and low in cost.
The embodiments in the present application are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus, device, and computer-readable storage medium embodiments, the description is simplified because they are substantially similar to the method embodiments, and reference may be made to some descriptions of the method embodiments for their relevance.
While the spirit and principles of the invention have been described with reference to several particular embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, nor is the division of aspects, which is for convenience only as the features in such aspects may not be combined to benefit. The invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (10)
1. A preparation method of a battery pole piece is characterized by comprising the following steps:
forming a pole piece to be treated by coating a slurry on a surface of a current collector moving in a first direction, the pole piece to be treated being formed to include, in a second direction perpendicular to the first direction, a coated region and non-coated regions on both sides of the coated region, the coated region including edge thinned regions located in edge regions on both sides of the coated region, a depressed region located in a middle region of the coated region, and a normal coated region located between the depressed region and the edge thinned region, and coated surface densities of the edge thinned region and the depressed region being lower than those of the normal coated region; and the number of the first and second groups,
and cutting the pole piece to be processed from the concave area of the coating area along the first direction to obtain a target pole piece.
2. The method of claim 1, wherein in the second direction, the pole piece coating area of the target pole piece comprises a first thinned area formed by the edge thinned area and a second thinned area formed by slitting the recessed area, the pole piece coating area comprises a first edge and a second edge opposite in the second direction;
the first edge is coincided with one side of the first thinning area, and the slurry coating thickness of the first thinning area is gradually increased from the first edge to the side, far away from the first edge, of the first thinning area;
the second edge is coincided with one side of the second thinning area, and the slurry coating thickness of the second thinning area is gradually increased from the second edge to the side, far away from the second edge, of the second thinning area.
3. The method of claim 2,
a slurry coating thickness of the first thinning region at the first edge is less than a slurry coating thickness of the second thinning region at the second edge.
4. The method of claim 1, wherein in the second direction, the pole piece coating area of the target pole piece comprises a first thinned area formed by the edge thinned area and a second thinned area formed by slitting the recessed area;
in the second direction, the lengths of the first thinned area and the second thinned area of the target pole piece are equal.
5. The method of claim 1, further comprising:
forming the coating areas on the surface of the current collector, wherein the coating areas are symmetrically arranged along a first tangent line, and the first tangent line is a central line of the coating areas in the second direction; and the number of the first and second groups,
and cutting the pole piece to be processed along the first tangent line to obtain a first pole piece and a second pole piece with the same size.
6. The method of claim 1, further comprising: the normal coating area comprises a first normal coating area and a second normal coating area, the edge thinning area comprises a first edge thinning area and a second edge thinning area, the first normal coating area is positioned between the depressed area and the first edge thinning area, the second normal coating area is positioned between the depressed area and the second edge thinning area, and the first normal coating area and the second normal coating area in the pole piece to be processed are formed to have different sizes in the second direction,
and cutting the pole piece to be processed along a second tangent line of the depressed area to obtain a third pole piece and a fourth pole piece with different sizes.
7. A die shim for carrying out the method of manufacture of any one of claims 1 to 6, comprising:
the gasket body is provided with a discharge hole and is used for coating slurry on the surface of the current collector to form a coating area;
the edge thinning parts are arranged at the edges of the two sides of the discharge port and are used for reducing the coating surface density of the edge thinning area of the coating area;
and the middle thinning part is arranged in the middle of the discharge port and used for reducing the coating surface density of the depressed area of the coating area.
8. The die shim of claim 7, wherein the intermediate skive includes a connecting end connected to the shim body and a free end extending to the discharge port; wherein the content of the first and second substances,
the free end of the middle thinning part is formed into a tip, and no gap is reserved between the top of the tip and the lip of the discharge hole; alternatively, a gap exists between the top of the free end of the intermediate thinned portion and the lip.
9. The die shim according to claim 7,
the connecting end of the intermediate thinned portion is detachably mounted on the gasket body.
10. A battery, comprising: a battery pole piece formed by the method of any one of claims 1-6.
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| CN202110394551.0A CN113130839B (en) | 2021-04-13 | 2021-04-13 | Preparation method of battery pole piece, die head gasket and battery |
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| CN202110394551.0A CN113130839B (en) | 2021-04-13 | 2021-04-13 | Preparation method of battery pole piece, die head gasket and battery |
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| WO2024007463A1 (en) * | 2022-07-04 | 2024-01-11 | 江苏时代新能源科技有限公司 | Coating quality inspection method, inspection apparatus and inspection system, and storage medium |
| CN117784999A (en) * | 2024-02-23 | 2024-03-29 | 宁德时代新能源科技股份有限公司 | Coating method and system, computer device and storage medium |
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| CN114975885B (en) * | 2022-06-13 | 2023-06-27 | 惠州锂威新能源科技有限公司 | Preparation method of tab pole piece, battery cell and lithium ion battery |
| WO2024007463A1 (en) * | 2022-07-04 | 2024-01-11 | 江苏时代新能源科技有限公司 | Coating quality inspection method, inspection apparatus and inspection system, and storage medium |
| EP4349495A1 (en) * | 2022-09-15 | 2024-04-10 | Contemporary Amperex Technology Co., Limited | Anilox roller and coating apparatus |
| CN117784999A (en) * | 2024-02-23 | 2024-03-29 | 宁德时代新能源科技股份有限公司 | Coating method and system, computer device and storage medium |
| CN118009950A (en) * | 2024-04-10 | 2024-05-10 | 东莞市大成智能装备有限公司 | Pole piece detection method and detection system |
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Address after: No.1 Jiangdong Avenue, Jintan District, Changzhou City, Jiangsu Province Applicant after: Zhongchuangxin Aviation Technology Co.,Ltd. Applicant after: AVIC Innovation Technology Research Institute (Jiangsu) Co.,Ltd. Applicant after: CHINA AVIATION LITHIUM BATTERY Co.,Ltd. Address before: No.1 Jiangdong Avenue, Jintan District, Changzhou City, Jiangsu Province Applicant before: AVIC lithium Technology Co.,Ltd. Applicant before: Kaibo Energy Technology Co.,Ltd. Applicant before: CHINA AVIATION LITHIUM BATTERY Co.,Ltd. |
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Effective date of registration: 20211231 Address after: No.1 Jiangdong Avenue, Jintan District, Changzhou City, Jiangsu Province Applicant after: Zhongchuangxin Aviation Technology Co.,Ltd. Applicant after: AVIC Innovation Technology Research Institute (Jiangsu) Co.,Ltd. Address before: No.1 Jiangdong Avenue, Jintan District, Changzhou City, Jiangsu Province Applicant before: Zhongchuangxin Aviation Technology Co.,Ltd. Applicant before: AVIC Innovation Technology Research Institute (Jiangsu) Co.,Ltd. Applicant before: CHINA AVIATION LITHIUM BATTERY Co.,Ltd. |
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