CN114447262A - Pole piece, coating device, battery cell, battery pack and manufacturing method of battery cell - Google Patents

Pole piece, coating device, battery cell, battery pack and manufacturing method of battery cell Download PDF

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Publication number
CN114447262A
CN114447262A CN202011193388.3A CN202011193388A CN114447262A CN 114447262 A CN114447262 A CN 114447262A CN 202011193388 A CN202011193388 A CN 202011193388A CN 114447262 A CN114447262 A CN 114447262A
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active layer
current collector
layer
active
slurry
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CN202011193388.3A
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CN114447262B (en
Inventor
高锃
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Beijing Xiaomi Mobile Software Co Ltd
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Beijing Xiaomi Mobile Software Co Ltd
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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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
    • 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
    • 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
    • H01M4/0409—Methods of deposition of the material by a doctor blade method, slip-casting or roller coating
    • 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
    • H01M4/0471—Processes of manufacture in general involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

The disclosure relates to a manufacturing method of a pole piece, a coating device, a battery cell, a battery pack and a battery cell, which comprises the following steps: a first current collector; the first active layer is formed on at least one surface of the first current collector, and the surface of the first active layer, which faces away from the first current collector, is provided with a plurality of saw-tooth-shaped protrusions; the first current collector is anode fluid, and the first active layer is an anode active layer; or the first current collector is a negative electrode fluid, and the first active layer is a negative electrode active layer. The surface area of the first active layer is increased by the aid of the plurality of saw-toothed protrusions, so that active reaction sites on the first active layer are increased, improvement of the dynamic performance of the pole piece is facilitated, and the charging speed is further improved.

Description

Pole piece, coating device, battery cell, battery pack and manufacturing method of battery cell
Technical Field
The disclosure relates to the technical field of batteries, in particular to a pole piece, a coating device, a battery cell, a battery pack and a manufacturing method of the battery cell.
Background
Rechargeable batteries represented by lithium batteries are widely used because of their light weight, conformity to the trend of green energy development, and the like. However, the battery is further developed due to the factors such as long charging time, and therefore how to increase the charging speed and improve the battery performance is an urgent problem to be solved.
Disclosure of Invention
The disclosure provides a pole piece, a coating device, a battery cell, a battery pack and a manufacturing method of the battery cell.
According to a first aspect of the embodiments of the present disclosure, there is provided a pole piece, including:
a first current collector;
the first active layer is formed on at least one surface of the first current collector, and the surface of the first active layer, which faces away from the first current collector, is provided with a plurality of saw-tooth-shaped protrusions;
the first current collector is anode fluid, and the first active layer is an anode active layer; or the first current collector is a negative electrode fluid, and the first active layer is a negative electrode active layer.
In some embodiments, the serrations are triangular-shaped bumps, rectangular-shaped bumps, or arch-shaped bumps.
According to a second aspect of the embodiments of the present disclosure, there is provided a coating apparatus for manufacturing the pole piece of any of the embodiments, including:
the surface of the coating roller is provided with grooves, the slurry for forming the first active layer is positioned on the surface of the coating roller, and the grooves are used for forming sawtooth-shaped protrusions on the first active layer;
the backing roll is located the side of scribbling the roller, with scribble and have the interval between the roller, the interval is used for supplying first mass flow body to pass, first mass flow body along with the rotation of backing roll removes, thick liquids along with scribble the rotation of roller and shift to the removal on the first mass flow body.
In some embodiments, the coating apparatus further comprises:
and the heating mechanism is connected with the coating roller, heats the coating roller and solidifies the slurry on the coating roller.
According to a third aspect of the embodiments of the present disclosure, there is provided an electrical core, including:
the pole piece of any of the above embodiments;
the diaphragm is in a zigzag shape and is attached to the surface, away from the first current collector, of the first active layer;
the second active layer is attached to the diaphragm, and the surface of the second active layer, which is far away from the diaphragm, is a plane;
the second current collector is attached to the surface, away from the diaphragm, of the second active layer;
the first current collector is a positive electrode fluid, when the first active layer is a positive electrode active layer, the second current collector is a negative electrode current collector, and the second active layer is a negative electrode active layer;
the first mass flow body is negative pole fluid, when the first active layer is a negative pole active layer, the second mass flow body is a positive pole mass flow body, and the second active layer is a positive pole active layer.
In some embodiments, the second active layer comprises: at least two active slurry layers and a bonding layer between two adjacent active slurry layers.
In some embodiments, the bonding layer comprises: a binder and a conductive agent.
In some embodiments, the bonding layer has a thickness of 2 to 10 μm.
In some embodiments, the elongation of the separator is 50 to 80%.
According to a fourth aspect of the embodiments of the present disclosure, there is provided a battery pack including:
the cell of any of the embodiments above;
the battery cell is positioned in the packaging shell;
and the electrolyte is positioned in the packaging shell, and the battery cell is immersed in the electrolyte.
According to a fourth aspect of the embodiments of the present disclosure, there is provided a method for manufacturing a battery cell, including:
the pole piece of any of the above embodiments;
placing a membrane on the first active layer, wherein the membrane is in a zigzag shape and is attached to the surface of the first active layer, which is away from the first current collector;
forming a second active layer and a second current collector on the surface of the diaphragm, which is far away from the first active layer, wherein the second active layer is attached to the diaphragm, and the surface of the diaphragm, which is far away from the diaphragm, is a plane; the second current collector is attached to the surface, away from the diaphragm, of the second active layer;
the first current collector is a positive electrode fluid, when the first active layer is a positive electrode active layer, the second current collector is a negative electrode current collector, and the second active layer is a negative electrode active layer;
the first mass flow body is negative pole fluid, when the first active layer is a negative pole active layer, the second mass flow body is a positive pole mass flow body, and the second active layer is a positive pole active layer.
In some embodiments, a second active layer and a second current collector are formed on a second surface of a separator, wherein the second active layer conforms to the second surface of the separator and a surface facing away from the separator is planar; the second current collector is attached to the surface, away from the diaphragm, of the second active layer; the method comprises the following steps:
forming a first active paste on the second current collector;
curing the first active slurry to form a first active slurry layer;
forming a second slurry on the separator;
curing the second slurry to form a second active slurry layer;
forming a bonding layer on the surface of the first active slurry layer, which faces away from the second current collector, or forming a bonding layer on the surface of the second active slurry layer, which faces away from the separator;
and fixing the first active slurry layer with the second current collector on the second active slurry layer through the bonding layer.
In some embodiments, fixing the first active paste layer with the second current collector on the second active paste layer through the bonding layer includes:
and rolling and compounding the second current collector, the first active slurry layer, the bonding layer, the second active slurry layer, the diaphragm and the pole piece.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:
according to the embodiment, the plurality of the saw-tooth-shaped protrusions are formed on the surface of the first active layer, the surface area of the first active layer is increased by the aid of the plurality of the saw-tooth-shaped protrusions, active reaction sites on the first active layer are increased, improvement of the dynamic performance of the pole piece is facilitated, and the charging speed is further improved. Moreover, compared with the planar first active layer without the saw-tooth-shaped protrusions, the amount of the first active layer loaded on the first current collector per unit area is increased after the saw-tooth-shaped protrusions are formed, and the energy density of the battery pack is further increased.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
FIG. 1 is a schematic diagram illustrating a stacked configuration of a pole piece and a diaphragm in accordance with an exemplary embodiment;
FIG. 2 is a schematic diagram of a coating apparatus according to an exemplary embodiment;
fig. 3 is a schematic view of the construction of the applicator roll of fig. 2.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of devices consistent with certain aspects of the present disclosure, as detailed in the appended claims.
In the description of the present disclosure, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings.
In the production process of the battery pack, the performance of the battery pack can be improved by punching holes on the surface of the pole piece, and in this way, under the condition that the surface areas of the positive pole piece and the negative pole piece are kept unchanged and the relative surface area between the pole piece and the membrane is not increased, the purpose of improving the performance of the battery pack is realized by increasing the infiltration of electrolyte on the surface active layer of the pole piece by utilizing the holes. In order to further improve the performance of the battery pack, the following technical scheme is provided in the disclosure.
As shown in fig. 1, an embodiment of the present disclosure provides a pole piece, including:
a first current collector 10;
a first active layer 20 formed on at least one surface of the first current collector 10, and a surface of the first active layer 20 facing away from the first current collector 10 has a plurality of saw-tooth-shaped protrusions 21;
the first current collector 10 is a positive electrode fluid, and the first active layer 20 is a positive electrode active layer; or the first current collector 10 is a negative electrode fluid, and the first active layer 20 is a negative electrode active layer.
In the embodiment of the disclosure, the current collector can collect the current generated by the active layer so as to output a large current. The first current collector may be a positive electrode fluid, such as: conductive materials such as aluminum foil or nickel foil. The first current collector may also be a negative current collector, for example: conductive materials such as copper foil and nickel foil.
The first active layer may be a positive electrode active layer formed on the surface of the positive electrode fluid. The first active layer may be a negative electrode active layer formed on the surface of the negative electrode fluid. Taking a lithium battery pack as an example, the active layer includes an active material capable of absorbing and releasing lithium. When the positive electrode active layer is formed, the positive electrode active material of the first active layer includes, but is not limited to, one or a combination of more of lithium cobaltate, lithium iron phosphate, lithium nickel cobalt manganese oxide, lithium manganate, lithium iron manganese phosphate, lithium vanadium phosphate, lithium vanadyl phosphate, lithium iron phosphate, and lithium titanate. When used as the negative active layer, the negative active material of the first active layer includes, but is not limited to, a material selected from the group consisting of transition metal oxides NaxMO2(M is a transition metal, such as one or more of Mn, Fe, Ni, Co, V, Cu, Cr, 0<x is less than or equal to 1) or polyanionic materials (phosphate, fluorophosphate, etc.),Pyrophosphate, sulfate), and the like.
In the charging process with the battery pack, the charging process generally includes: active ions (such as lithium ions, sodium ions and the like) removed from the positive electrode active layer enter the electrolyte, and the electrolyte transfers the active ions to the negative electrode sheet and performs charge exchange with the negative electrode active layer. Taking the negative electrode plate as an example, the larger the area of the negative electrode active layer is, the more active sites available for the reaction of active ions are, the faster the exchange speed of the active ions and the charges of the negative electrode active layer is, and the better the dynamic performance of the battery pack formed by the electrode plate is, the higher the charging speed can be borne.
As shown in fig. 1, in the embodiment of the present disclosure, the plurality of saw-tooth protrusions 21 may increase the surface area of the first active layer 20, so as to increase the number of active reaction sites located on the first active layer 20, which is beneficial to the dynamic performance of the pole piece, and further increase the charging speed.
Moreover, for the first active layer that has level and smooth surface, this disclosed pole piece has improved the first active layer's of the first mass flow body load of unit area volume, and then has improved the energy density of battery package. Compared with a battery pack consisting of the first active layer with a flat surface, the battery pack formed by the pole piece has larger capacity in the battery pack with the same size. Moreover, the present disclosure also reduces the current density per unit area of the first active layer.
In other alternative embodiments, the serrations are triangular, rectangular, or arcuate shaped protrusions.
Fig. 1 exemplarily shows a first active layer 20 having a plurality of triangular saw-tooth protrusions 21, wherein the plurality of triangular saw-tooth protrusions 21 are sequentially end-to-end and juxtaposed. Without limitation, the width of the bottom surface of the triangular saw-tooth protrusion 21 is between 10-200um, for example, the width L of the bottom surface of the triangular saw-tooth protrusion 21 is in a range of any value or any two values of 10um, 20um, 50um, 100um, 150um, 170um or 200 um. The thickness H is between 10-100 um. For example, the thickness of the triangular-shaped saw-tooth projection 21 is in a range of any value or any two values of 10um, 20um, 50um, 65um, 70um, 90um, or 100 um.
It is to be understood that the serration is not limited to the triangular-shaped protrusion, the rectangular-shaped protrusion, or the arch-shaped protrusion.
The embodiment of the present disclosure further provides a coating apparatus, configured to manufacture the pole piece according to any one of the above embodiments, as shown in fig. 2, including:
the coating roller 110 is provided with grooves 111 on the surface, the slurry 160 for forming the first active layer 20 is positioned on the surface of the coating roller 110, and the grooves 111 are used for forming the saw-tooth-shaped protrusions 21 on the first active layer 20;
and a back roll 120 located on the side of the coating roll 110, wherein a gap 130 is formed between the back roll 110 and the coating roll 110, the gap 130 is used for allowing the first current collector 10 to pass through, the first current collector 10 moves along with the rotation of the back roll 120, and the slurry 160 is transferred onto the moving first current collector 10 along with the rotation of the coating roll 110.
In the embodiment of the present disclosure, as shown in fig. 3, the surface of the coating roller 110 has a plurality of grooves 111 distributed in parallel along the circumferential direction, and due to the grooves 111, the surface of the coating roller 110 has uneven lines. The grooves 111 are used to form the serrations 21 on the surface of the first active layer 20. Specifically, the slurry 160 on the surface of the coating roller 110 at least partially flows into the grooves 111, the slurry 160 in the grooves 111 may have the shape of the grooves 111, and when the slurry 160 on the surface of the coating roller 110 is transferred onto the first current collector 10, the first active layer 20 on the first current collector 10 also has the saw-toothed protrusions 21.
Optionally, any two of the saw-tooth protrusions on the first active layer are substantially the same in shape and size, so that the charging rate of the battery can be conveniently adjusted, and the uniformity of the current density at different positions of the first active layer can be ensured.
Any two grooves of the corresponding coating roller are also substantially identical in shape and size to ensure that any two identical serrations are formed.
In some specific examples, the surface layer of the coating roller can be replaced, so that the grooves with different specifications can be replaced to form the saw-tooth-shaped protrusions with different specifications and shapes.
By way of non-limiting example, in the case of transfer coating as shown in fig. 2, in practical applications, the coating roller 110 and the backing roller 120 can rotate synchronously and in the same direction. Wherein, the rotation of the coating roller 110 drives the transfer of the slurry 160, the first current collector 10 moves along with the rotation of the backing roller 120, and the first current collector 10 passes through the gap 130 between the coating roller 110 and the backing roller 120.
In some specific examples, as shown in fig. 2, the coating apparatus further includes: and a blade 140, wherein the blade 140 is positioned above the coating roller 110, and has a gap 150 with the coating roller 110, and the gap 150 is used for allowing the slurry 160 forming the first active layer 20 to pass through, i.e. the transfer amount of the slurry 160 is adjusted by adjusting the gap 150 between the blade 140 and the coating roller 110, thereby controlling the thickness of the first active layer 20.
In other optional embodiments, the coating apparatus further comprises:
and the heating mechanism is connected with the coating roller, heats the coating roller and solidifies the slurry on the coating roller.
The heating mechanism is used for indirectly heating the slurry on the coating roller through the coating roller, the slurry on the surface of the coating roller is rapidly heated and solidified in the process of transferring the slurry by the coating roller, the noise of the saw-tooth-shaped protrusions of the slurry transferred to the surface of the first current collector due to the fact that the slurry has high fluidity is suppressed, and the heating mechanism ensures that the required saw-tooth-shaped protrusions are finally formed on the surface of the first current collector.
In a specific example, the heating mechanism includes a resistance wire that is in contact with the applicator roll. When the power is on, the resistance wire can convert electric energy into heat energy, the coating roller is heated, and then the coating roller transmits the heat energy to the slurry to solidify the slurry.
An embodiment of the present disclosure further provides an electrical core, as shown in fig. 1, the electrical core includes:
the pole piece of any of the above embodiments;
a separator 30 having a zigzag shape and attached to a surface of the first active layer 20 facing away from the first current collector 10;
the second active layer 40 is attached to the diaphragm 30, and the surface, which is far away from the diaphragm 30, is a plane;
a second current collector 50 attached to a surface of the second active layer 40 facing away from the separator 30;
when the first current collector 10 is a positive electrode fluid and the first active layer 20 is a positive electrode active layer, the second current collector 50 is a negative electrode current collector, and the second active layer 40 is a negative electrode active layer;
the first current collector 10 is a negative electrode fluid, and when the first active layer 20 is a negative electrode active layer, the second current collector 50 is a positive electrode current collector, and the second active layer 40 is a positive electrode active layer.
In the embodiment of the disclosure, the battery cell may be formed by a winding process of a diaphragm group formed by sequentially overlapping a pole piece, a diaphragm and a first current collector having a second active layer, or at least one diaphragm group may be formed by a lamination process.
Without limitation, the separator is a microporous membrane, such as: polypropylene microporous films or polyethylene microporous films, and the like. The diaphragm is used for isolating the positive pole piece and the negative pole piece and realizes the function of ion conduction by utilizing the micropores.
As shown in fig. 1, the separator 30 is attached to the plurality of serrations 21 of the first active layer 20, and the separator 30 has a serration structure matching the serrations 21. The second active layer 40 located on the side of the diaphragm 30 departing from the first active layer 20 also has a saw-toothed structure, and the saw-toothed structure on the second active layer 40 fills the gap between the adjacent saw-toothed structures of the diaphragm 30, and in appearance, the diaphragm group formed by sequentially overlapping the pole piece, the diaphragm 30 and the first current collector 10 with the second active layer 40 is a smooth structure, so that the subsequent winding process or lamination process of the diaphragm group can be normally performed. The first active layer 20, the diaphragm 30 and the second active layer 40 have the zigzag structure, so that the contact area of the contact interface among the first active layer, the diaphragm 30 and the second active layer is increased, and the contact reliability of the contact interface is effectively ensured on the basis of further improving the quick charging performance.
In other alternative embodiments, the second active layer 40 includes: at least two active paste layers 41 and 43, and a bonding layer 42 between the adjacent active paste layers.
And one of the active slurry layers on the two sides is attached to the second current collector, and the other active slurry layer is attached to the diaphragm. In practical application, the two slurry layers may be the same or different.
Without limitation, the performance of the battery pack may be improved by using two different active slurry layers, wherein the slurry layer attached to the second current collector may be a slurry layer capable of improving energy density, and the slurry layer attached to the separator may be a slurry layer capable of improving rapid charging. For example, a slurry layer conforming to the second current collector may employ a greater compaction density, in contrast, to achieve a higher energy density. And the slurry layer jointed with the diaphragm has lower compaction density so as to obtain the quick filling effect. Alternatively, different compositions may be used to form the two different active paste layers.
Without limitation, during the manufacturing process, a one-side slurry layer may be coated on the second current collector and a bonding layer may be formed on the slurry layer; another slurry layer can be formed on the surface of the diaphragm by adopting a spraying mode, and then the second current collector is attached to the diaphragm through the bonding layer.
In other alternative embodiments, the bonding layer comprises: a binder and a conductive agent.
The binder is used for ensuring the interface bonding force and the firmness of the active layer attached to the current collector. The conductive agent is used to ensure the transfer of charge.
Without limitation, the binder may be selected from the group consisting of polyvinylidene fluoride, polyurethane, copolymers of vinylidene fluoride-hexafluoropropylene, polyamide, polyacrylonitrile, polyacrylate, polyacrylic acid, polyacrylate, sodium carboxymethylcellulose, polyvinylpyrrolidone, polyvinyl ether, polymethyl methacrylate, polytetrafluoroethylene, polyhexafluoropropylene, or styrene butadiene rubber in combination with one or more. The conductive agent can be one or more of carbon nano tube, carbon fiber, conductive carbon black, acetylene black, graphene or Ketjen black.
In other optional embodiments, the thickness of the bonding layer is 2-10 μm. For example, the thickness of the adhesive layer may be any value or range between any two values of 2 μm, 3 μm, 5 μm, 6 μm, 8 μm, or 10 μm.
In other alternative embodiments, the membrane has a stretch ratio (ratio of stretched length to original length) of 50-80%.
In practical applications, the separator is not fully stretched, covering the surface of the first active layer.
Without limitation, the elongation of the separator may be any one value or a range of any two values of 50%, 55%, 60%, 70%, 75%, or 80%.
The embodiment of the present disclosure also provides a battery pack, including:
the cell of any of the embodiments above;
the battery cell is positioned in the packaging shell;
and the electrolyte is positioned in the packaging shell, and the battery cell is immersed in the electrolyte.
Generally, at least one battery cell is arranged in one packaging shell, and when the number of the battery cells is more than two, the more than two battery cells can be connected in parallel and/or in series. The packaging shell can be a flexible shell such as an aluminum plastic film and the like to form a flexible package battery. Or a hard metal shell such as a steel shell or an alloy shell.
The embodiment of the disclosure also provides a manufacturing method of the battery cell, which at least includes the following steps:
s101, manufacturing the pole piece in any one of the embodiments;
s102, placing a diaphragm on the first active layer, wherein the diaphragm is in a sawtooth shape and is attached to the surface, away from the first current collector, of the first active layer;
s103, forming a second active layer and a second current collector on the surface of the diaphragm, which is far away from the first active layer, wherein the second active layer is attached to the diaphragm, and the surface of the diaphragm, which is far away from the diaphragm, is a plane; the second current collector is attached to the surface, away from the diaphragm, of the second active layer;
the first current collector is a positive electrode fluid, when the first active layer is a positive electrode active layer, the second current collector is a negative electrode current collector, and the second active layer is a negative electrode active layer;
the first mass flow body is negative pole fluid, when the first active layer is a negative pole active layer, the second mass flow body is a positive pole mass flow body, and the second active layer is a positive pole active layer.
In an embodiment of the present disclosure, the battery cell is the battery cell described in any of the above embodiments. As shown in fig. 1, the separator 30 is located between the first active layer 20 and the second active layer 40, the contact interface between the separator 30 and the first active layer 20 is in a zigzag shape, and the contact interface between the separator 30 and the second active layer 40 is also in a zigzag shape, and compared with a flat contact interface, the contact interface has a larger area, which is beneficial to improving the dynamic performance of the battery pack and improving the charging speed and energy density.
In a specific example, the manufacturing of the pole piece according to any of the above embodiments includes: and coating and forming a first active layer on the first current collector. Specifically, the slurry 160 may be coated on the first current collector 10 using the coating apparatus shown in fig. 2 and 3, and the first active layer 20 is formed after the slurry 160 is cured.
After the first active layer is formed, a separator that is not completely stretched may be directly coated on the first active layer without performing a process such as rolling the first active layer.
In other alternative embodiments, a second active layer and a second current collector are formed on a second surface of a separator, wherein the second active layer is attached to the second surface of the separator, and a surface facing away from the separator is a plane; the second current collector is attached to the surface, away from the diaphragm, of the second active layer; as shown in fig. 1, includes:
forming a first active paste on the second current collector 50;
curing the first active paste to form a first active paste layer 43;
forming a second slurry on the separator 30;
curing the second paste to form a second active paste layer 41;
forming an adhesive layer 42 on a surface of the first active paste layer 43 facing away from the second current collector 50, or forming an adhesive layer on a surface of the second active paste layer 41 facing away from the separator 30;
the first active paste layer 43 with the second current collector 50 is fixed on the second active paste layer 41 through the adhesive layer 42.
In practical applications, the second slurry may be formed on the separator by spraying or the like. And the second active slurry layer and the first active slurry layer are bonded and fixed by using the bonding layer, so that the second current collector and the diaphragm are compounded. In other alternative embodiments, fixing the first active paste layer with the second current collector on the second active paste layer through the bonding layer includes:
and rolling and compounding the second current collector, the first active slurry layer, the bonding layer, the second active slurry layer, the diaphragm and the pole piece.
As shown in fig. 1, the rolling process can enhance the bonding force between the second active paste layer 41, the bonding layer 42 and the first active paste layer 43, and can further improve the composite effect of the second current collector 50, the first active paste layer 43, the bonding layer 42, the second active paste layer 41, the separator 30 and the pole piece. And (3) after the rolled diaphragm groups are compounded, carrying out conventional winding or lamination and other procedures to prepare the battery cell.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: a mobile storage device, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The embodiment of the present disclosure provides a specific hardware based on the above device embodiment, including a processor (CPU), a storage medium, and at least one external communication interface; the processor, the storage medium and the external communication interface are all connected through a bus. The processor can be a microprocessor, a central processing unit, a digital signal processor, a programmable logic array or other electronic components with processing functions. The storage medium has stored therein computer executable code. The processor, when executing the computer executable code, is capable of at least: manufacturing the pole piece of any one of the embodiments;
placing a membrane on the first active layer, wherein the membrane is in a zigzag shape and is attached to the surface of the first active layer, which is away from the first current collector;
forming a second active layer and a second current collector on the surface of the diaphragm, which is far away from the first active layer, wherein the second active layer is attached to the diaphragm, and the surface of the diaphragm, which is far away from the diaphragm, is a plane; the second current collector is attached to the surface, away from the diaphragm, of the second active layer;
the first current collector is a positive electrode fluid, when the first active layer is a positive electrode active layer, the second current collector is a negative electrode current collector, and the second active layer is a negative electrode active layer;
the first mass flow body is negative pole fluid, when the first active layer is a negative pole active layer, the second mass flow body is a positive pole mass flow body, and the second active layer is a positive pole active layer.
The methods disclosed in the several method embodiments provided in this disclosure may be combined arbitrarily without conflict to arrive at new method embodiments.
Features disclosed in several of the product embodiments provided in this disclosure may be combined in any combination to yield new product embodiments without conflict.
The features disclosed in the several method or article of manufacture embodiments provided herein may be combined in any combination to yield new method or article of manufacture embodiments without conflict.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (13)

1. A pole piece, comprising:
a first current collector;
the first active layer is formed on at least one surface of the first current collector, and the surface of the first active layer, which faces away from the first current collector, is provided with a plurality of saw-tooth-shaped protrusions;
the first current collector is anode fluid, and the first active layer is an anode active layer; or the first current collector is a negative electrode fluid, and the first active layer is a negative electrode active layer.
2. The pole piece of claim 1 wherein the serrations are triangular, rectangular or arcuate projections.
3. A coating apparatus for making a pole piece according to claim 1 or 2, comprising:
the surface of the coating roller is provided with grooves, the slurry for forming the first active layer is positioned on the surface of the coating roller, and the grooves are used for forming sawtooth-shaped protrusions on the first active layer;
the backing roll is located the side of scribbling the roller, with scribble and have the interval between the roller, the interval is used for supplying first mass flow body to pass, first mass flow body along with the rotation of backing roll removes, thick liquids along with scribble the rotation of roller and shift to the removal on the first mass flow body.
4. The coating apparatus of claim 3, further comprising:
and the heating mechanism is connected with the coating roller, heats the coating roller and solidifies the slurry on the coating roller.
5. A battery cell, comprising:
the pole piece of claim 1 or 2;
the diaphragm is in a zigzag shape and is attached to the surface, away from the first current collector, of the first active layer;
the second active layer is attached to the diaphragm, and the surface of the second active layer, which is far away from the diaphragm, is a plane;
the second current collector is attached to the surface, away from the diaphragm, of the second active layer;
the first current collector is a positive electrode fluid, when the first active layer is a positive electrode active layer, the second current collector is a negative electrode current collector, and the second active layer is a negative electrode active layer;
the first mass flow body is negative pole fluid, when the first active layer is a negative pole active layer, the second mass flow body is a positive pole mass flow body, and the second active layer is a positive pole active layer.
6. The cell of claim 5, wherein the second active layer comprises: at least two active slurry layers and a bonding layer between two adjacent active slurry layers.
7. The cell of claim 6, wherein the bonding layer comprises: a binder and a conductive agent.
8. The battery cell of claim 7, wherein the bonding layer has a thickness of 2-10 μm.
9. The battery cell of claim 5, wherein the tensile rate of the separator is 50-80%.
10. A battery pack, comprising:
the cell of any of claims 5 to 9;
the battery cell is positioned in the packaging shell;
and the electrolyte is positioned in the packaging shell, and the battery cell is immersed in the electrolyte.
11. A method for manufacturing a battery cell is characterized by comprising the following steps:
manufacturing a pole piece according to claim 1 or 2;
placing a membrane on the first active layer, wherein the membrane is in a sawtooth shape and is attached to the surface of the first active layer, which is far away from the first current collector;
forming a second active layer and a second current collector on the surface of the diaphragm, which is far away from the first active layer, wherein the second active layer is attached to the diaphragm, and the surface of the diaphragm, which is far away from the diaphragm, is a plane; the second current collector is attached to the surface, away from the diaphragm, of the second active layer;
the first current collector is a positive electrode fluid, when the first active layer is a positive electrode active layer, the second current collector is a negative electrode current collector, and the second active layer is a negative electrode active layer;
the first mass flow body is negative pole fluid, when the first active layer is a negative pole active layer, the second mass flow body is a positive pole mass flow body, and the second active layer is a positive pole active layer.
12. The method for manufacturing the battery cell according to claim 11, wherein a second active layer and a second current collector are formed on a second surface of the separator, wherein the second active layer is attached to the second surface of the separator, and a surface facing away from the separator is a plane; the second current collector is attached to the surface, away from the diaphragm, of the second active layer; the method comprises the following steps:
forming a first active paste on the second current collector;
curing the first active slurry to form a first active slurry layer;
forming a second slurry on the separator;
curing the second slurry to form a second active slurry layer;
forming a bonding layer on the surface of the first active slurry layer, which is far away from the second current collector, or forming a bonding layer on the surface of the second active slurry layer, which is far away from the separator;
and fixing the first active slurry layer with the second current collector on the second active slurry layer through the bonding layer.
13. The method for manufacturing the battery cell of claim 12, wherein the step of fixing the first active paste layer with the second current collector on the second active paste layer through the adhesive layer comprises:
and rolling and compounding the second current collector, the first active slurry layer, the bonding layer, the second active slurry layer, the diaphragm and the pole piece.
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