CN219267689U - Printed electrode and lithium ion battery - Google Patents
Printed electrode and lithium ion battery Download PDFInfo
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- CN219267689U CN219267689U CN202222552250.9U CN202222552250U CN219267689U CN 219267689 U CN219267689 U CN 219267689U CN 202222552250 U CN202222552250 U CN 202222552250U CN 219267689 U CN219267689 U CN 219267689U
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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
Abstract
The application relates to the technical field of lithium ion battery preparation, in particular to a printed electrode and a lithium ion battery. The printed electrode provided by the embodiment of the application comprises a first insulating film, an anode strip and a cathode strip; the positive electrode strip and the negative electrode strip are arranged on the same side of the first insulating film at intervals; one end of the positive electrode strip is provided with a positive electrode wire, one end of the negative electrode strip is provided with a negative electrode wire, and one positive electrode strip and one negative electrode strip form an electrode unit. The positive electrode strip and the negative electrode strip that this application provided are arranged in first insulating film at intervals, wholly are the slice, are convenient for realize buckling. The capacity can be adjusted by the number of electrode units arranged at intervals, so that the capacity requirement of a user on the printed electrode is met. The printed electrode has the technical effects of being light and thin, being convenient to bend and meeting the capacity requirement of a user. The printed electrode and the lithium ion battery provided by the application have the technical effects because the printed electrode is included.
Description
Technical Field
The application relates to the technical field of lithium ion battery preparation, in particular to a printed electrode and a lithium ion battery.
Background
With the development of new energy automobile industry and portable electronic equipment, lithium ion batteries become a main energy storage structure. And miniaturization and diversification of lithium ion batteries become the main stream direction of development of lithium ion batteries.
In the related art, the lithium ion battery is manufactured by coating positive and negative electrode slurry on aluminum foil and copper foil respectively and winding or laminating the positive and negative electrode slurry, and has larger thickness and difficult bending. The sheet battery is generally manufactured by laminating a positive electrode and a negative electrode, and the thickness of the battery is reduced by reducing the number of layers of the electrode sheet.
However, due to the limitation of the structure, the thickness of the lithium ion battery is hardly expected, which also makes it difficult to increase the capacity of the battery cell.
Disclosure of Invention
The application provides a printed electrode and a lithium ion battery, which can effectively solve the above or other potential technical problems.
A first aspect of the present application provides a printed electrode including a first insulating film, a positive electrode bar, and a negative electrode bar; the positive electrode strip and the negative electrode strip are arranged on the same side of the first insulating film at intervals; one end of the positive electrode strip is provided with a positive electrode wire, one end of the negative electrode strip is provided with a negative electrode wire, and one positive electrode strip and one negative electrode strip form an electrode unit.
In an alternative embodiment according to the first aspect, the printed electrode comprises at least two electrode units, the spacing between adjacent two electrode units being 2mm-10mm.
The arrangement is convenient for a user to set the number of different electrode units according to the requirement on capacity, and further different requirements of the user are flexibly met. The two adjacent electrode units are arranged at intervals, so that the subsequent insulation treatment is convenient to be carried out between the two adjacent electrode units, namely, the phenomenon of short circuit of the two adjacent electrode units is avoided.
In an alternative embodiment according to the first aspect, all positive electrode strips of at least two electrode units are arranged in parallel; all negative electrode strips of at least two electrode units are arranged in parallel, and all positive electrode strips are arranged in parallel with all negative electrode strips.
The arrangement is convenient for realizing the integration of the capacity of all the electrode units into the finally formed lithium electronic battery.
In an alternative embodiment according to the first aspect, the positive electrode strip and the negative electrode strip are both rectangular strip-shaped structures, and the long side of the positive electrode strip is arranged parallel to the long side of the negative electrode strip.
So set up, the structure is neat, is convenient for later stage and fills electrolyte between anodal strip and negative pole strip.
In an alternative embodiment according to the first aspect, the first insulating film has a first end and a second end disposed opposite to each other on an extension plane, the positive electrode strip and the negative electrode strip each extend along the first end toward the second end, and the two ends of the positive electrode strip have a space between the first end and the second end, respectively, and form a first spacing region; the two ends of the negative electrode strip are respectively spaced from the first end and the second end, and a second spacing area is formed.
By the arrangement, the positive electrode strip and the negative electrode strip are both arranged inside the first insulating film, and the phenomenon that the positive electrode strip and the negative electrode strip exceed the insulating film to cause electric leakage or short circuit can be avoided.
In an alternative embodiment according to the first aspect, the positive electrode lead is disposed on the first insulating film in the first spaced region and disposed near the first end, and the negative electrode lead is disposed on the first insulating film in the second spaced region and disposed near the second end; or, the positive electrode lead is arranged on the first insulating film in the first interval region and is close to the second end, and the negative electrode lead is arranged on the first insulating film in the second interval region and is close to the first end.
So set up, be convenient for set up positive pole wire and negative pole wire respectively on being close to first end and second end, can be convenient for realize that positive pole wire is parallelly connected, perhaps parallelly connected with the negative pole wire, avoid crisscross setting, lead to the condition that positive pole wire and negative pole wire are connected.
In an alternative embodiment according to the first aspect, the positive electrode lead comprises a conductive glue or a conductive wire; and/or the negative electrode lead comprises conductive glue or conductive metal wires.
The arrangement is convenient for realizing the parallel connection of a plurality of positive electrode strips and the electric conduction requirement of the positive electrode strips, or for realizing the parallel connection of a plurality of negative electrode strips and the electric conduction requirement of the negative electrode strips.
In an alternative embodiment according to the first aspect, the first insulating film comprises a film body and a water-repellent coating applied to a surface of the film body.
The first insulating film is so arranged as to have a waterproof function.
In an alternative embodiment according to the first aspect, the thickness of the first insulating film is 20 μm to 500 μm; and/or the number of the groups of groups,
the thickness of the positive electrode strip is 30-150 mu m; and/or the number of the groups of groups,
the thickness of the negative electrode strip is 30-150 μm.
The second aspect of the present application also provides a lithium ion battery, comprising: a second insulating film, an electrolyte, and the above-described printed electrode; the interval between the positive electrode strip and the negative electrode strip of each electrode unit of the printing electrode is filled with electrolyte; the second insulating film covers one side of the first insulating film of the printed electrode, on which the electrode units are arranged, and the first insulating film and the second insulating film which are positioned between every two adjacent electrode units are attached.
The printed electrode provided by the embodiment of the application comprises a first insulating film, an anode strip and a cathode strip; the positive electrode strip and the negative electrode strip are arranged on the same side of the first insulating film at intervals; one end of the positive electrode strip is provided with a positive electrode wire, one end of the negative electrode strip is provided with a negative electrode wire, and one positive electrode strip and one negative electrode strip form an electrode unit. The positive electrode strip and the negative electrode strip that this application provided are arranged in first insulating film at intervals, wholly are the slice, are convenient for realize buckling. Meanwhile, the capacity can be adjusted through the number of electrode units arranged at intervals, so that the capacity requirement of a user on the printed electrode is met. In summary, the printed electrode provided by the application has the technical effects of being light and thin, being convenient to bend and meeting the capacity requirement of users.
The printed electrode and the lithium ion battery provided by the application have the technical effects of being light and thin, being convenient to bend and meeting the requirement of the capacity of a user because the printed electrode is included.
Additional aspects of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The foregoing and other objects, features and advantages of embodiments of the present application will become more readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings. Embodiments of the present application will now be described, by way of example and not limitation, in the figures of the accompanying drawings, in which:
fig. 1 is a schematic diagram of the overall structure of a printed electrode according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of the lithium ion battery provided in the embodiment of the present application in a completely attached state of the second insulating film and the first insulating film;
fig. 3 is a schematic structural diagram of a lithium ion battery provided in an embodiment of the present application in a state in which a second insulating film and a first insulating film are completely partially staggered.
Reference numerals illustrate:
10. a lithium ion battery; 100. printing an electrode; 110. a first insulating film; 111. a first end; 112. a second end; 120. a positive electrode bar; 121. a positive electrode lead; 130. a negative electrode strip; 131. a negative electrode lead; 140. an electrode unit; 200. a second insulating film; 300. an electrolyte.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and intended for the purpose of explaining the present application and are not to be construed as limiting the present application.
In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate an orientation or positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.
In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be a mechanical connection; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., 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 application. In this specification, schematic representations of the above terms are not necessarily directed 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.
With the development of new energy automobile industry and portable electronic equipment, lithium ion batteries become a main energy storage structure. And miniaturization and diversification of lithium ion batteries become the main stream direction of development of lithium ion batteries. In the related art, the lithium ion battery is manufactured by coating positive and negative electrode slurry on aluminum foil and copper foil respectively and winding or laminating the positive and negative electrode slurry, and has larger thickness and difficult bending. The sheet battery is generally manufactured by laminating a positive electrode and a negative electrode, and the thickness of the battery is reduced by reducing the number of layers of the electrode sheet. However, due to the limitation of the structure, the thickness of the lithium ion battery is hardly expected, which also makes it difficult to increase the capacity of the battery cell.
In view of this, the printed electrode provided in the embodiment of the present application includes a first insulating film, a positive electrode strip, and a negative electrode strip; the positive electrode strip and the negative electrode strip are arranged on the same side of the first insulating film at intervals; one end of the positive electrode strip is provided with a positive electrode wire, one end of the negative electrode strip is provided with a negative electrode wire, and one positive electrode strip and one negative electrode strip form an electrode unit. The positive electrode strip and the negative electrode strip that this application provided are arranged in first insulating film at intervals, wholly are the slice, are convenient for realize buckling. Meanwhile, the capacity can be adjusted through the number of electrode units arranged at intervals, so that the capacity requirement of a user on the printed electrode is met.
Referring to fig. 1, a printed electrode 100 provided in an embodiment of the present application includes a first insulating film 110, a positive electrode strip 120, and a negative electrode strip 130; the positive electrode bar 120 and the negative electrode bar 130 are disposed at the same side of the first insulating film 110 at intervals; one end of the positive electrode strip 120 has a positive electrode wire 121, one end of the negative electrode strip 130 has a negative electrode wire 131, and one positive electrode strip 120 and one negative electrode strip 130 constitute one electrode unit 140.
In an alternative exemplary embodiment, the printed electrode 100 includes at least two electrode units 140, and a spacing between adjacent two electrode units 140 is 2mm-10mm.
It should be noted that, in this embodiment, the printed electrode 100 includes at least two electrode units 140, so that the user can set the number of different electrode units 140 according to the requirement on the capacity, and further flexibly meet the different requirements of the user.
It should be further noted that, the two adjacent electrode units 140 are disposed at intervals, so that the subsequent insulation treatment between the two adjacent electrode units 140 is facilitated, that is, the short circuit phenomenon of the two adjacent electrode units 140 is avoided.
Specifically, in the present embodiment, the interval between adjacent two electrode units 140 may be set to 2mm to 10mm. Illustratively, in the present embodiment, the interval between the adjacent two electrode units 140 may be set to 5mm.
In an alternative exemplary embodiment, all positive electrode bars 120 of at least two electrode units 140 are arranged in parallel; all negative electrode strips 130 of at least two electrode units 140 are arranged in parallel, and all positive electrode strips 120 are arranged in parallel with all negative electrode strips 130. It should be noted that, in the present embodiment, all the positive electrode strips 120 of at least two electrode units 140 are arranged in parallel; all negative electrode strips 130 of at least two electrode units 140 are arranged in parallel, and all positive electrode strips 120 are arranged in parallel with all negative electrode strips 130. This arrangement facilitates integration of the capacity of all electrode units 140 into the final formed lithium-ion battery.
Specifically, all the positive electrode wires 121 of at least two electrode units 140 are connected to each other and extend toward the outside of the first insulating film 110 to form a positive electrode terminal. All the negative electrode leads 131 of at least two electrode units 140 are connected to each other and extend toward the outside of the first insulating film 110 to form a negative electrode terminal.
In an alternative exemplary embodiment, the positive electrode bar 120 and the negative electrode bar 130 are each in a rectangular bar-shaped structure, and the long side of the positive electrode bar 120 is disposed in parallel with the long side of the negative electrode bar 130.
In the present embodiment, the positive electrode strip 120 and the negative electrode strip 130 are both rectangular strip structures, and the long side of the positive electrode strip 120 is parallel to the long side of the negative electrode strip 130. So arranged, the structure is neat, facilitating the later filling of electrolyte 300 between positive and negative electrode strips 120, 130.
It will be appreciated that the specific shapes of the positive electrode stripes 120 and the negative electrode stripes 130 are not limited herein, and in other specific embodiments, the shapes of the positive electrode stripes 120 and the negative electrode stripes 130 may be configured to be arc-shaped, ring-shaped, or other irregular shapes, etc., according to the needs of the user.
In an alternative exemplary embodiment, the first insulating film 110 has a first end 111 and a second end 112 disposed opposite to each other on an extension plane thereof, the positive electrode strip 120 and the negative electrode strip 130 each extend along the first end 111 toward the second end 112, and both ends of the positive electrode strip 120 have a space from the first end 111 and the second end 112, respectively, and form a first space region; the negative electrode strip 130 has a space between both ends thereof and the first and second ends 111 and 112, respectively, and forms a second spaced region.
In particular, in the present embodiment, the first insulating film 110 has a first end 111 and a second end 112 disposed opposite to each other on an extension plane, the positive electrode strip 120 and the negative electrode strip 130 extend along the first end 111 toward the second end 112, and two ends of the positive electrode strip 120 have a space between the first end 111 and the second end 112, respectively, and form a first spacing region; the negative electrode strip 130 has a space between both ends thereof and the first and second ends 111 and 112, respectively, and forms a second spaced region. That is, the positive electrode strip 120 and the negative electrode strip 130 are disposed on the first insulating film 110, and the two ends of the positive electrode strip 120 and the negative electrode strip 130 leave a space, instead of being disposed on the edge of the first insulating film 110, so that the positive electrode strip 120 and the negative electrode strip 130 are both included inside the first insulating film 110, and the phenomenon that the positive electrode strip 120 and the negative electrode strip exceed the insulating film to cause electric leakage or short circuit can be avoided.
In an alternative exemplary embodiment, the positive electrode wire 121 is disposed on the first insulating film 110 located in the first spaced region and is disposed near the first end 111, and the negative electrode wire 131 is disposed on the first insulating film 110 located in the second spaced region and is disposed near the second end 112; alternatively, the positive electrode wire 121 is disposed on the first insulating film 110 located in the first spaced region and is disposed near the second end 112, and the negative electrode wire 131 is disposed on the first insulating film 110 located in the second spaced region and is disposed near the first end 111.
In particular, in the present embodiment, the positive electrode wire 121 is disposed on the first insulating film 110 located in the first spaced region and is disposed near the first end 111, and the negative electrode wire 131 is disposed on the first insulating film 110 located in the second spaced region and is disposed near the second end 112. That is, the positive electrode lead 121 is disposed on the first insulating film 110 near the first end 111, and the negative electrode lead 131 is disposed on the first insulating film 110 near the second end 112. Alternatively, the positive electrode wire 121 is disposed on the first insulating film 110 located in the first spaced region and is disposed near the second end 112, and the negative electrode wire 131 is disposed on the first insulating film 110 located in the second spaced region and is disposed near the first end 111. That is, the positive electrode lead 121 is disposed on the first insulating film 110 near the second end 112, and the negative electrode lead 131 is disposed on the first insulating film 110 near the first end 111. So set up, be convenient for set up positive pole wire 121 and negative pole wire 131 respectively near first end 111 and second end 112, can be convenient for realize positive pole wire 121 parallelly connected, perhaps parallelly connected with negative pole wire 131, avoid crisscross setting, lead to the condition that positive pole wire 121 and negative pole wire 131 are connected.
Illustratively, in the illustration in the present embodiment, the positive electrode wire 121 is disposed on the first insulating film 110 located in the first spaced region and is disposed near the second end 112, and the negative electrode wire 131 is disposed on the first insulating film 110 located in the second spaced region and is disposed near the first end 111.
In alternative exemplary embodiments, the positive electrode wire 121 includes conductive paste or conductive wires; and/or, the negative electrode lead 131 includes conductive paste or conductive wire.
In particular, in this embodiment, the conductive adhesive is an adhesive having a certain conductivity after curing or drying. Multiple conductive materials may be joined together to form an electrical path between the joined materials. It should be noted that the conductive wire has good performance, and the smaller size is convenient for meeting the requirement of users for realizing electric connection. Setting the positive electrode wire 121 as conductive glue or conductive wire facilitates the realization of the parallel connection of the plurality of positive electrode strips 120 and the realization of the conductive requirement of the positive electrode strips 120, and setting the negative electrode wire 131 as conductive glue or conductive wire facilitates the realization of the parallel connection of the plurality of negative electrode strips 130 and the realization of the conductive requirement of the negative electrode strips 130.
In an alternative exemplary embodiment, the first insulating film 110 includes a film body and a waterproof coating applied to a surface of the film body.
In particular, in the present embodiment, the first insulating film 110 includes a film body and a waterproof coating layer applied to the surface of the film body, the waterproof coating layer being provided so that the first insulating film 110 has a waterproof function.
In an alternative exemplary embodiment, the thickness of the first insulating film 110 is 20 μm to 500 μm. Illustratively, the thickness of the first insulating film 110 is 150 μm.
In an alternative exemplary embodiment, the thickness of the positive electrode bar 120 is 30 μm to 150 μm; the thickness of the positive electrode bar 120 is, for example, 50 μm.
In an alternative exemplary embodiment, the thickness of the negative electrode strip 130 is 30 μm-150 μm. The thickness of the negative electrode strip 130 is, for example, 50 μm.
Referring to fig. 2 and 3, the embodiment of the present application further provides a lithium ion battery 10, including: a second insulating film 200, an electrolyte 300, and the above-described printed electrode 100; the interval between the positive electrode bar 120 and the negative electrode bar 130 of each electrode unit 140 of the printed electrode 100 is filled with the electrolyte 300; the second insulating film 200 covers the side of the printed electrode 100 where the electrode units 140 are disposed on the first insulating film 110, and the first insulating film 110 and the second insulating film 200 between every two adjacent electrode units 140 are attached.
The lithium ion battery 10 provided in the present application includes the second insulating film 200, the electrolyte 300, and the printed electrode 100 described above. The interval between the positive electrode bar 120 and the negative electrode bar 130 of each electrode unit 140 of the printed electrode 100 is filled with the electrolyte 300, and the second insulating film 200 covers the side of the printed electrode 100 where the electrode units 140 are disposed of the first insulating film 110, and the first insulating film 110 and the second insulating film 200 wrap all the electrode units 140 to achieve insulation.
It should be noted that, the first insulating film 110 and the second insulating film 200 between each adjacent two of the electrode units 140 are attached to each other, so that insulation between each electrode unit 140 and the adjacent electrode unit 140 is facilitated.
In order to illustrate the structure of the lithium-ion battery provided by the application, the manufacturing method of the lithium-ion battery provided by the application is described as follows:
the first insulating film 110 and the second insulating film 200 provided in the embodiments of the present application may use PET, PP, PI, PE, PVC as a film body, and a waterproof coating layer is provided on the film body.
The positive electrode slurry provided by the embodiment of the application comprises a positive electrode material, a conductive agent, a binder and a solvent. Wherein the positive electrode material is one or more of lithium cobaltate, lithium nickel cobalt manganate, lithium nickel manganate, lithium-rich manganese material, lithium iron phosphate, lithium iron manganese phosphate, lithium manganate and Prussian white; the conductive agent is one or more of super-P, graphite and VGCF, CNT, SWCNT; the binder is one or more of PVDF, SBR, PTFE and nitrile polymer; the solvent is typically NMP or deionized water. Uniformly dispersing the anode material, the conductive agent, the adhesive and the solvent material by double planetary dispersing equipment according to a certain proportion to form slurry, wherein the viscosity of the anode slurry is 8000-10000 Pa.s,
the preparation of the negative electrode slurry provided by the embodiment of the application comprises a negative electrode material, a conductive agent, a binder, a thickener and a solvent. Wherein the negative electrode material is one or more of graphite, hard carbon, silicon carbon negative electrode, silicon oxide, lithium titanate and tin oxide; the conductive agent is one or more of super-P, graphite and VGCF, CNT, SWCNT; the binder is one or more of SBR, PVDF, nitrile polymer and acrylic polymer; the thickener is CMC; the solvent is deionized water or NMP. And uniformly dispersing the anode material, the conductive agent, the binder and the thickener in the anode slurry according to a certain proportion by double-planet dispersing equipment to form slurry, wherein the viscosity of the anode slurry is 6000-1000 mPa.s.
The positive electrode paste and the negative electrode paste are printed on the first insulating film 110 by using a screen printing mode, and are dried in an oven after printing, wherein the drying temperature is 50-120 ℃. Wherein, the width of the positive electrode strip 120 obtained by printing is 0.1 mm-2 mm; the width of the negative electrode strip 130 is 0.1mm to 2mm, and the interval between the positive electrode strip 120 and the negative electrode strip 130 is 0.05mm to 1mm as a filling space for the subsequent electrolyte 300, and is used for shuttling lithium ions between the positive electrode strip 120 and the negative electrode strip 130. One of the positive electrode stripes 120, one of the negative electrode stripes 130, and the interval therebetween are subsequently used to fill the electrolyte 300 to constitute one electrode unit 140, that is, to constitute the smallest unit of the battery, and the interval distance between adjacent two electrode units 140 is 2mm to 10mm for the separation of the units from each other.
The adjacent two electrode units 140 may be connected by wires, that is, the positive electrode strips 120 are connected in parallel by the positive electrode wires 121, the negative electrode strips 130 are connected in parallel by the negative electrode wires 131, and the wires may be conductive glue or conductive metal wires. In this embodiment, the conductive adhesive is one or more of conductive silver paste, conductive carbon paste and CNT conductive adhesive, and the conductive adhesive is disposed on the first insulating film 110 by screen printing, so that the electrode units 140 are connected in parallel, and the width of the conductive adhesive is 20 μm-100 μm.
After the positive electrode strip 120, the negative electrode strip 130, the positive electrode wire 121 and the negative electrode wire 131 are printed on the first insulating film 110, the positive electrode strip 120 or the negative electrode strip 130 is placed on a roller press for rolling under the rolling pressure of 1T-5T, and the distance between particles is smaller, so that the binding agent and the particles are closer, the binding force is better, the positive electrode strip or the negative electrode strip 130 is not easy to fall off, the printed second insulating film is used for sealing each electrode unit 140 in a hot pressing mode by using a hot press after the rolling, and a gap on one side of the first end 111 or the second end 112 of the first insulating film 110 is reserved for filling the electrolyte 300 into the interval between the positive electrode strip 120 and the negative electrode strip 130 so as to form the electrolyte 300. The first insulating film 110 and the second insulating film 200 are commonly wrapped to seal each electrode unit 140 at the time of sealing, and a space of 2mm to 10mm between two adjacent electrode units 140 is used for bonding the first insulating film 110 and the second insulating film 200 to prevent mutual influence between the electrode units 140.
Then, the unsealed side is placed in an electrolyte 300 for soaking, the electrolyte 300 fills up the space between the anode and the cathode through capillary phenomenon, and the electrolyte 300 comprises one or more of LiPF6 and LiBOB, liFSI, liTFSI; the solvent in the electrolyte 300 is one or more of DMC, DEC, PC, EC, EA; the electrolyte 300 may undergo one or more of a p-phenylenediamine, an acrylic nitrile compound, and a polyol that undergo a gel reaction, and may undergo a cross-linking reaction during formation to form the gel electrolyte 300. The electrolyte 300 is absorbed, sealed, and formed into a flexible sheet-like lithium ion battery 10.
To illustrate that the capacity performance of the lithium-ion battery provided in the present application does not decline due to the change in structural settings, the following three examples will now be conducted to compare battery ploidy with one comparative example.
Example 1:
in the positive electrode slurry, solutes comprise nickel cobalt lithium manganate, a conductive agent and PVDF; and high nickel ternary: conductive agent: pvdf=96%: 2%: mixing 2% of the solution with NMP solvent, setting the solid content as 72%, namely the solute as 72% and the solvent as 18%; and (3) placing the solute and the solvent in double-planetary equipment to be uniformly mixed to form positive electrode slurry, wherein the viscosity of the slurry is 9350mPa.s.
In the negative electrode slurry, the solute comprises graphite, a conductive agent, CMC and SBR; and graphite: conductive agent: CMC: sbr=95%: 1%:1.5%: mixing 2.5% with deionized water solvent, setting solid content to 49%, namely 49% solute and 51% solvent; and (3) placing the solute and the solvent into double-planetary equipment to be uniformly mixed to form negative electrode slurry, wherein the viscosity of the slurry is 7460mPa.s.
Positive and negative electrode strips 130 were printed as a first insulating film 110 on an electrolyte-resistant 300PET film having a length of 50mm, a width of 50mm, and a thickness of 150 μm using a screen printing technique;
firstly, printing a negative electrode strip 130, wherein the width of the negative electrode strip 130 is 0.3mm, and the surface density is 10mg/cm 2 The drying temperature of the pole piece is 75 ℃, and the baking time is 30min;
the negative electrode strip 130 was dried and then printed with a positive electrode strip 120, the positive electrode strip 120 having a width of 0.3mm and a surface density of 15mg/cm 2 The interval between the positive electrode bar 120 and the negative electrode bar 130 is 0.2mm, the interval between the adjacent two electrode units 140 is 5mm, and the drying condition temperature is 90 ℃ for 45min.
The positive electrode strip 120 and the negative electrode strip 130 are connected in parallel by using a screen printing technology and adopting conductive silver paste as a wire, wherein the width of the conductive silver paste is 30 mu m, and the conductive silver paste is dried for 30min at 50 ℃ in an oven after printing.
And (3) drying the electrode film, placing the electrode film on a roll squeezer for rolling, compacting the electrode film to 2.5T, and finishing the preparation of the printed electrode 100 after the rolling.
Subsequently, aligning the second insulating film 200 with the thickness of 150 μm with the first insulating film 110 of the printed electrode 100, then placing the aligned second insulating film on a hot press for hot air, wherein the heat sealing temperature is 150 ℃, and leaving one side perpendicular to the electrode direction to be not encapsulated as a liquid injection port of the electrolyte 300;
after the heat sealing is finished, the battery cell is placed in the electrolyte 300 for filling the electrolyte 300, and after the electrolyte 300 is absorbed, the battery cell is packaged by a hot press; a cell of the lithium ion battery 10 is obtained.
The lithium ion battery 10 is obtained after the battery cell is charged at 0.2C, and the specific results of the multiplying power discharge test on the battery cell are shown in the following table.
Example 2:
example 2 differs from example 1 in that: the width of the negative electrode strip 130 is 0.5mm, and the width of the positive electrode strip 120 is 0.5mm.
Specifically, in the positive electrode slurry, the solute comprises nickel cobalt lithium manganate, a conductive agent and PVDF; and high nickel ternary: conductive agent: pvdf=96%: 2%: mixing 2% of the solution with NMP solvent, setting the solid content as 72%, namely the solute as 72% and the solvent as 18%; and (3) placing the solute and the solvent in double-planetary equipment to be uniformly mixed to form positive electrode slurry, wherein the viscosity of the slurry is 9350mPa.s.
In the negative electrode slurry, the solute comprises graphite, a conductive agent, CMC and SBR; and graphite: conductive agent: CMC: sbr=95%: 1%:1.5%: mixing 2.5% with deionized water solvent, setting solid content to 49%, namely 49% solute and 51% solvent; and (3) placing the solute and the solvent into double-planetary equipment to be uniformly mixed to form negative electrode slurry, wherein the viscosity of the slurry is 7460mPa.s.
Positive and negative electrode strips 130 were printed as a first insulating film 110 on an electrolyte-resistant 300PET film having a length of 50mm, a width of 50mm, and a thickness of 150 μm using a screen printing technique;
firstly, printing a negative electrode strip 130, wherein the width of the negative electrode strip 130 is 0.5mm, and the surface density is 10mg/cm 2 The drying temperature of the pole piece is 75 ℃, and the baking time is 30min;
the negative electrode strip 130 was dried and then printed with a positive electrode strip 120, the positive electrode strip 120 having a width of 0.5mm and a surface density of 15mg/cm 2 The interval between the positive electrode bar 120 and the negative electrode bar 130 is 0.2mm, the interval between the adjacent two electrode units 140 is 5mm, and the drying condition temperature is 90 ℃ for 45min.
The positive electrode strip 120 and the negative electrode strip 130 are connected in parallel by using a screen printing technology and adopting conductive silver paste as a wire, wherein the width of the conductive silver paste is 30 mu m, and the conductive silver paste is dried for 30min at 50 ℃ in an oven after printing.
And (3) drying the electrode film, placing the electrode film on a roll squeezer for rolling, compacting the electrode film to 2.5T, and finishing the preparation of the printed electrode 100 after the rolling.
Subsequently, aligning the second insulating film 200 with the thickness of 150 μm with the first insulating film 110 of the printed electrode 100, then placing the aligned second insulating film on a hot press for hot air, wherein the heat sealing temperature is 150 ℃, and leaving one side perpendicular to the electrode direction to be not encapsulated as a liquid injection port of the electrolyte 300;
after the heat sealing is finished, the battery cell is placed in the electrolyte 300 for filling the electrolyte 300, and after the electrolyte 300 is absorbed, the battery cell is packaged by a hot press; a cell of the lithium ion battery 10 is obtained.
The lithium ion battery 10 is obtained after the battery cell is charged at 0.2C, and the specific results of the multiplying power discharge test on the battery cell are shown in the following table.
Example 3:
example 3 differs from example 1 in that: surface Density of negative electrode strip 130 12mg/cm 2 The positive electrode strip 120 had an areal density of 18mg/cm 2 。
Specifically, embodiment 2 differs from embodiment 1 in that: the width of the negative electrode strip 130 is 0.5mm, and the width of the positive electrode strip 120 is 0.5mm.
Specifically, in the positive electrode slurry, the solute comprises nickel cobalt lithium manganate, a conductive agent and PVDF; and high nickel ternary: conductive agent: pvdf=96%: 2%: mixing 2% of the solution with NMP solvent, setting the solid content as 72%, namely the solute as 72% and the solvent as 18%; and (3) placing the solute and the solvent in double-planetary equipment to be uniformly mixed to form positive electrode slurry, wherein the viscosity of the slurry is 9350mPa.s.
In the negative electrode slurry, the solute comprises graphite, a conductive agent, CMC and SBR; and graphite: conductive agent: CMC: sbr=95%: 1%:1.5%: mixing 2.5% with deionized water solvent, setting solid content to 49%, namely 49% solute and 51% solvent; and (3) placing the solute and the solvent into double-planetary equipment to be uniformly mixed to form negative electrode slurry, wherein the viscosity of the slurry is 7460mPa.s.
Positive and negative electrode strips 130 were printed as a first insulating film 110 on an electrolyte-resistant 300PET film having a length of 50mm, a width of 50mm, and a thickness of 150 μm using a screen printing technique;
firstly, printing a negative electrode strip 130, wherein the width of the negative electrode strip 130 is 0.5mm, and the surface density is 12mg/cm 2 The drying temperature of the pole piece is 75 ℃, and the baking time is 30min;
the negative electrode strip 130 was dried and then printed with a positive electrode strip 120, the positive electrode strip 120 having a width of 0.5mm and a surface density of 18mg/cm 2 The interval between the positive electrode strip 120 and the negative electrode strip 130 is 0.2mm, the interval between two adjacent electrode units 140 is 5mm, and the drying condition temperature is 90The time period is 45min;
the positive electrode strip 120 and the negative electrode strip 130 are connected in parallel by using a screen printing technology and adopting conductive silver paste as a wire, wherein the width of the conductive silver paste is 30 mu m, and the conductive silver paste is dried for 30min at 50 ℃ in an oven after printing.
And (3) drying the electrode film, placing the electrode film on a roll squeezer for rolling, compacting the electrode film to 2.5T, and finishing the preparation of the printed electrode 100 after the rolling.
Subsequently, aligning the second insulating film 200 with the thickness of 150 μm with the first insulating film 110 of the printed electrode 100, then placing the aligned second insulating film on a hot press for hot air, wherein the heat sealing temperature is 150 ℃, and leaving one side perpendicular to the electrode direction to be not encapsulated as a liquid injection port of the electrolyte 300;
after the heat sealing is finished, the battery cell is placed in the electrolyte 300 for filling the electrolyte 300, and after the electrolyte 300 is absorbed, the battery cell is packaged by a hot press; a cell of the lithium ion battery 10 is obtained.
The lithium ion battery 10 is obtained after the battery cell is charged at 0.2C, and the specific results of the multiplying power discharge test on the battery cell are shown in the following table.
Comparative example 1:
the positive and negative electrode pastes were the same as those used in the above three examples. Coating positive and negative electrode slurry on aluminum foil and copper foil, and preparing a battery cell through procedures such as drying, rolling, slitting, flaking and winding;
the battery cell is packaged in an aluminum plastic box, and the battery cell is prepared through the procedures of baking, liquid injection, aging, formation and the like;
the positive electrode surface density in the cell is 15mg/cm 2 The surface density of the negative electrode is 10mg/cm 2 ；
After the battery cell is formed, preparing the battery cell by two-sealing and capacity-separating;
the cell test rate performance is shown in the following table.
| Project | 0.2C/0.2C | 0.5C/0.2C | 1C/0.2C | 1.5C/0.2C | 2C/0.2C |
| Example 1 | 100％ | 99.70％ | 97.20％ | 94.30％ | 92.60％ |
| Example 2 | 100％ | 99.50％ | 96.90％ | 94.10％ | 92.10％ |
| Example 3 | 100％ | 99.60％ | 97.10％ | 94.50％ | 92.30％ |
| Comparative example 1 | 100％ | 98.70％ | 95.60％ | 92.10％ | 88.40％ |
It can be seen from the above table that the battery rate performance of the lithium ion battery 10 provided by the present application is better, that is, the battery manufactured by using the printed electrode 100 while the lithium ion battery 10 provided by the present application has bending performance, and can be bent at any angle, and the area can be made larger.
Finally, it should be noted that: the above embodiments are merely for illustrating the technical solution of the present application, and are not limiting thereof; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced with equivalents; such modifications and substitutions do not depart from the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the various possible combinations are not described further.
Claims (10)
1. A printed electrode, comprising a first insulating film, a positive electrode strip and a negative electrode strip; the positive electrode strip and the negative electrode strip are arranged on the same side of the first insulating film at intervals; one end of the positive electrode strip is provided with a positive electrode wire, one end of the negative electrode strip is provided with a negative electrode wire, and one positive electrode strip and one negative electrode strip form an electrode unit.
2. The printed electrode according to claim 1, comprising at least two electrode units, the spacing between adjacent two of said electrode units being 2mm-10mm.
3. The printed electrode according to claim 2, wherein all of the positive bars of the at least two electrode units are arranged in parallel; all the negative electrode strips of the at least two electrode units are arranged in parallel, and all the positive electrode strips are arranged in parallel with all the negative electrode strips.
4. The printed electrode of claim 1, wherein the positive electrode strip and the negative electrode strip are each in a rectangular strip-like structure, and a long side of the positive electrode strip is disposed parallel to a long side of the negative electrode strip.
5. The printed electrode of claim 1, wherein the first insulating film has a first end and a second end disposed opposite to each other on an extension plane, the positive electrode strip and the negative electrode strip each extend along the first end toward the second end, and the two ends of the positive electrode strip have a space between the first end and the second end, respectively, and form a first spacer;
and two ends of the negative electrode strip are respectively spaced from the first end and the second end, and a second spacing area is formed.
6. The printed electrode of claim 5, wherein the positive lead is disposed on the first insulating film within the first spacer and disposed proximate the first end, and the negative lead is disposed on the first insulating film within the second spacer and disposed proximate the second end; or alternatively, the first and second heat exchangers may be,
the positive electrode lead is arranged on the first insulating film in the first interval region and is close to the second end, and the negative electrode lead is arranged on the first insulating film in the second interval region and is close to the first end.
7. The printed electrode of any of claims 1 to 6, wherein the positive electrode lead comprises a conductive paste or a conductive wire; and/or the number of the groups of groups,
the negative electrode lead comprises conductive glue or conductive metal wires.
8. The printed electrode of any one of claims 1 to 6, wherein the first insulating film comprises a film body and a waterproof coating applied to a surface of the film body.
9. The printed electrode according to any one of claims 1 to 6, wherein the thickness of the first insulating film is 20 μm-500 μm; and/or the number of the groups of groups,
the thickness of the positive electrode strip is 30-150 mu m; and/or the number of the groups of groups,
the thickness of the negative electrode strip is 30-150 mu m.
10. A lithium ion battery, comprising: a second insulating film, an electrolyte, and the printed electrode of any one of claims 1 to 9;
the space between the positive electrode strip and the negative electrode strip of each electrode unit of the printed electrode is filled with the electrolyte;
the second insulating film covers one side of the first insulating film of the printed electrode, on which the electrode units are arranged, and the first insulating film and the second insulating film which are positioned between every two adjacent electrode units are attached.
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| CN202222552250.9U CN219267689U (en) | 2022-09-21 | 2022-09-21 | Printed electrode and lithium ion battery |
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| CN202222552250.9U CN219267689U (en) | 2022-09-21 | 2022-09-21 | Printed electrode and lithium ion battery |
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