WO2019169560A1 - 一种电芯及其制造方法、电池以及电子装置 - Google Patents
一种电芯及其制造方法、电池以及电子装置 Download PDFInfo
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- WO2019169560A1 WO2019169560A1 PCT/CN2018/078176 CN2018078176W WO2019169560A1 WO 2019169560 A1 WO2019169560 A1 WO 2019169560A1 CN 2018078176 W CN2018078176 W CN 2018078176W WO 2019169560 A1 WO2019169560 A1 WO 2019169560A1
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- positive electrode
- active material
- sheet
- electrode sheet
- material layer
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- 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
Definitions
- the present application relates to the field of battery manufacturing, and in particular to an electric core, a method of manufacturing the same, a battery, and an electronic device.
- the battery generally has a battery core, and the battery core usually includes a positive electrode sheet, a negative electrode sheet and a diaphragm sheet.
- the battery core usually includes a positive electrode sheet, a negative electrode sheet and a diaphragm sheet.
- the edges of the positive electrode sheet and the negative electrode sheet may have edge alignment problems.
- a redox reaction occurs to cause a lithium deposition problem at the edge of the negative electrode sheet.
- the present application provides a battery core, a method for manufacturing the same, a battery, and an electronic device to solve the problem of lithium deposition at the edge of the negative electrode sheet when the positive electrode sheets and the negative electrode sheets of the battery core are aligned in the prior art.
- a technical solution adopted by the present application is to provide a method for manufacturing a battery cell, wherein the battery core manufacturing method includes: providing a positive electrode substrate; and providing a positive active material on the surface of the positive electrode substrate to form a first positive electrode active a material layer; de-energizing the edge region of the first positive electrode active material layer to form a second positive electrode active material layer, wherein the second positive electrode active material layer has a conductivity of not more than 10 ⁇ (-10) S/m.
- another technical solution adopted by the present application is to provide a battery core for use in a battery, wherein the battery core includes a positive electrode plate, and the positive electrode plate includes a positive electrode substrate and a surface of the positive electrode substrate.
- the positive electrode active material layer includes a first positive electrode active material and a second positive electrode active material layer, and the second positive electrode active material layer has a conductivity of not more than 10 ⁇ (-10) S/m; the second positive electrode active material The layer is disposed in an edge region of the positive electrode sheet substrate, the first positive electrode active material layer is disposed on a surface of the positive electrode sheet substrate excluding the second positive electrode active material layer, and the second positive electrode active material layer is deactivated by the first positive electrode active material layer Processed.
- another technical solution adopted by the present application is to provide an electronic device, wherein the electronic device includes a battery, and the battery includes the battery core according to any of the foregoing.
- the present application provides a battery core, a manufacturing method thereof, a battery, and an electronic device.
- a second positive active material layer having a conductivity of not more than 10 ⁇ (-10) S/m at the edge portion of the positive electrode sheet of the battery core, the lithium metal deposition phenomenon of the negative electrode sheet of the battery core can be alleviated, thereby improving the battery core. Service life.
- FIG. 1 is a schematic flow chart of an embodiment of a method for manufacturing a battery cell according to the present application
- FIG. 2 is a schematic flow chart of another embodiment of a method for manufacturing a battery cell according to the present application.
- FIG. 3 is a schematic flow chart of still another embodiment of a method for manufacturing a battery cell according to the present application.
- FIG. 4 is a schematic flow chart of still another embodiment of a method for manufacturing a battery cell according to the present application.
- FIG. 5 is a schematic structural view of an embodiment of a battery cell provided by the present application.
- Figure 6 is a cross-sectional view of the cross section of Figure 5 taken along line A-A';
- Figure 7 is a schematic structural view of a battery unit of Figure 6;
- FIG. 8 is a schematic structural view of an embodiment of a positive electrode sheet in the battery unit provided in FIG. 7;
- FIG. 9 is a schematic structural view of another embodiment of a positive electrode sheet in the battery unit provided in FIG. 7;
- FIG. 10 is a schematic structural view of still another embodiment of a positive electrode sheet in the battery unit provided in FIG. 7;
- FIG. 11 is a schematic structural view of an embodiment of a battery provided by the present application.
- FIG. 12 is a schematic structural diagram of an embodiment of an electronic device provided by the present application.
- references to "an embodiment” herein mean that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of the present application.
- the appearances of the phrases in various places in the specification are not necessarily referring to the same embodiments, and are not exclusive or alternative embodiments that are mutually exclusive. Those skilled in the art will understand and implicitly understand that the embodiments described herein can be combined with other embodiments.
- FIG. 1 is a schematic flow chart of an embodiment of a method for manufacturing a battery cell according to the present application. Among them, the specific steps of the battery manufacturing method are as follows:
- Step S101 providing a positive electrode substrate.
- the positive electrode substrate is generally an aluminum foil.
- a specific step in which the positive electrode substrate is provided is that the aluminum block is made into an aluminum foil, and the aluminum foil is cut into a predetermined size to form a positive electrode substrate.
- the aluminum block is changed into aluminum foil mainly by rolling force rolling, that is, the roll gap is adjusted so that the roll gap is kept at a certain value so that the aluminum block is rolled into aluminum foil of uniform thickness.
- Step S102 providing a positive electrode active material on the surface of the positive electrode sheet substrate to form a first positive electrode active material layer.
- step S102 is continued. That is, the positive electrode active material is uniformly applied to the surface of the positive electrode sheet substrate to form a positive electrode active material layer; the positive electrode substrate coated with the positive electrode active material is cut into a size required for manufacturing the positive electrode sheet; and the positive electrode substrate after cutting is completed The positive electrode tab is welded to the preset position, and then the subsequent processing is performed to complete the fabrication of the positive electrode sheet.
- the positive active material may include a lithium-containing metal compound or a lithium-intercalable metal compound such as lithium cobalt oxide, lithium manganese oxide, lithium nickel manganese oxide, lithium nickel manganese cobalt oxide, lithium iron phosphate, lithium manganese phosphate. Salt, carbon black and polyvinylidene fluoride (PVDF).
- Step S103 A second positive electrode active material layer is disposed in an edge region of the first positive electrode active material layer, wherein a conductivity of the second positive electrode active material layer is not more than 10 ⁇ (-10) S/m.
- step S103 is continued. That is, the second positive electrode active material layer is provided in the edge region of the first positive electrode active material layer, wherein the conductivity of the second positive electrode active material layer is not more than 10 ⁇ (-10) S/m.
- the conductivity of the first positive electrode active material layer may be greater than the electrical conductivity of the second positive electrode active material layer, so that the conductivity of the intermediate portion of the positive electrode sheet can be improved to improve the charge and discharge efficiency of the positive electrode sheet.
- a gypsum treatment may be performed on the edge region of the first positive electrode active material layer so that the gel penetrates into the positive electrode active material in the edge region of the first positive electrode active material layer to form the second positive electrode active material layer.
- the conductivity of the second positive active material layer can be made less than 10 ⁇ (-10) S/m by selecting a small conductive adhesive, thereby weakening the conductivity of the edge portion of the positive electrode sheet, thereby weakening the edge of the positive electrode sheet and the negative electrode sheet.
- the oxidation-reduction reaction is carried out at the edge to alleviate the problem of lithium metal deposition in the negative electrode sheet.
- an insulating paste may be used during the edge-penetrating treatment, so that the insulating rubber penetrates into the first positive electrode active material layer, and the positive electrode active material is wrapped to form a non-conductive second active material layer.
- the insulating glue may be paraffin wax, PE glue or PP glue, etc., and the insulating glue needs a certain wettability at the same time, so that the insulating glue is more easily adhered to the edge region of the first positive electrode active material layer.
- the second positive electrode active material layer may be provided to the edge region of the positive electrode sheet substrate by vapor deposition, coating, plating or sputtering.
- the method mainly comprises using a barrier to block an intermediate portion of the first positive active material layer without shielding the edge region, and then setting a small conductive material to the positive electrode substrate by a forming process such as evaporation, coating, plating or sputtering. There is no occluded edge region thereon, thereby forming a second positive electrode active material layer having a conductivity of not more than 10 ⁇ (-10) S/m.
- the material for forming the second positive electrode active material layer includes at least one of an organic material such as paraffin, PE glue, and PP glue; or the material forming the second positive electrode active material layer includes a metal compound such as alumina, oxidation At least one of magnesium or barium sulfate.
- the method of manufacturing the battery core further includes manufacturing the negative electrode sheet and the separator sheet.
- the manufacturing method of the negative electrode sheet includes providing a negative electrode substrate, coating a surface of the negative electrode active material with a negative electrode active material to form a negative electrode active material layer, and then cutting the negative electrode sheet into a predetermined size.
- the negative electrode substrate may be a copper foil
- the negative electrode active material may include graphite, sodium carboxymethyl cellulose (CMC), and styrene-butadiene rubber (Styrene-butadiene). Rubber, SBR) Metal lithium, lithium metal powder, lithium metal oxide or various carbon materials.
- the diaphragm sheet is mainly manufactured by cutting the diaphragm sheet into a predetermined size.
- a positive electrode tab is disposed on the positive electrode sheet
- a negative electrode tab is disposed on the negative electrode sheet.
- the method of providing the positive electrode tab on the positive electrode sheet and the method of providing the negative electrode tab on the negative electrode sheet may be the same as the method of providing the positive electrode tab on the positive electrode sheet.
- the method for disposing a positive electrode tab on a positive electrode sheet comprises: cutting a positive electrode substrate into a sheet having a convex portion when the positive electrode substrate is cut, wherein the convex portion can be used as a positive electrode tab, that is, the positive electrode can be connected to the positive electrode
- the sheet substrate is integrally disposed; or the prepared positive electrode tab is welded to a predetermined position on the positive electrode sheet such that the positive electrode tab is electrically connected to the first positive electrode active material layer on the positive electrode sheet.
- the method for producing the above battery cells is a method for producing a positive electrode sheet, a negative electrode sheet, and a separator sheet. After the fabrication of the positive electrode sheet, the negative electrode sheet, and the separator sheet is completed, it is also required to provide the separator sheet between the positive electrode sheet and the negative electrode sheet, and the positive electrode sheet, the separator sheet, and the negative electrode sheet are sequentially stacked, and then the positive electrode sheets are stacked.
- the separator sheet and the negative electrode sheet are wound and formed to form a core of the battery core; or the positive electrode sheet, the separator sheet and the negative electrode sheet are stacked in the order of the positive electrode sheet, the separator sheet, the negative electrode sheet, the separator sheet, and the positive electrode sheet.
- the structure required for the cell is a method for producing a positive electrode sheet, a negative electrode sheet, and a separator sheet.
- the positive electrode sheet, the negative electrode sheet, and the separator sheet are further encapsulated, that is, after the separator sheet is placed between the positive electrode sheet and the negative electrode sheet, the obtained positive electrode sheet and separator are obtained.
- the assembly of the sheet and the negative electrode sheet is packaged.
- the specific method of the package is to provide a casing, and then a accommodating space is arranged inside the casing to set the positive electrode piece, the diaphragm piece and the negative electrode piece into the accommodating space, and then the accommodating space of the outer casing is sealed, thereby the positive electrode piece The diaphragm and the negative electrode are sealed in the inner housing space of the outer casing.
- the electrolyte Before the sealing of the accommodating space, the electrolyte needs to be injected into the accommodating space, so that the electrolyte immerses the positive electrode sheet, the diaphragm sheet and the negative electrode sheet.
- the positive electrode sheet and the negative electrode sheet are subjected to charge transfer through the electrolytic solution, so that the entire battery core can be charged and discharged.
- the positive electrode sheet, the negative electrode sheet, and the separator sheet can be cut into the same size, so that the positive electrode sheet, the negative electrode sheet, and the separator sheet are assembled more conveniently and quickly, thereby improving the manufacturing efficiency of the battery core. Since the second positive electrode active material layer is provided at the edge of the positive electrode sheet and/or the negative electrode sheet and the conductivity of the second positive electrode active material layer is not more than 10 ⁇ (-10) S/m, the positive electrode sheet and the negative electrode sheet can be prevented. When the diaphragm sheets are the same size, there may be a problem of lithium deposition at the edges of the negative electrode sheets.
- the number of the jig or the alignment tool can be reduced during assembly of the positive electrode sheet, the negative electrode sheet, and the separator sheet, so that the assembly tool can be reduced and the manufacturing cost can be reduced.
- FIG. 2 is a schematic flow chart of another embodiment of a method for manufacturing a battery cell according to the present application.
- the battery core includes a positive electrode sheet, and the manufacturing method of the battery battery core is as follows:
- the method of providing the positive electrode sheet substrate and the material of the positive electrode sheet substrate in this step are the same as those described in the previous step S101, and will not be described herein.
- a second positive electrode active material layer is disposed on an edge region of the surface of the positive electrode sheet substrate, wherein a conductivity of the second positive electrode active material layer is not more than 10 ⁇ (-10) S/m.
- step S202 is continued. That is, the second positive electrode active material layer is formed on the edge region of the surface of the positive electrode sheet substrate, and the second positive electrode active material layer may be formed on the surface of the positive electrode substrate by a vapor deposition, coating, plating or sputtering. Edge area.
- the method is formed by blocking a middle region of the positive electrode substrate with a barrier, and then setting a material of the second positive active material layer to an edge region of the positive electrode substrate that is not blocked to form a second positive active material layer.
- the material for forming the second positive electrode active material layer includes at least one of an organic material such as paraffin, PE glue, and PP glue; or the material forming the second positive electrode active material layer includes a metal oxide such as alumina, oxidation At least one of magnesium or barium sulfate causes the conductivity of the second positive electrode active material layer to be not more than 10 ⁇ (-10) S/m.
- a first positive electrode active material layer is provided in a region other than the second positive electrode active material layer on the surface of the positive electrode sheet substrate.
- step S203 the process proceeds to step S203. That is, after the second positive electrode active material layer is provided in the edge region of the surface of the positive electrode sheet substrate, the first positive electrode active material layer is then disposed in the central region other than the second positive electrode active material layer on the surface of the positive electrode sheet substrate, so that the second positive electrode active material layer The first positive active material layer is surrounded.
- the first positive electrode active material layer may be formed by a molding process such as evaporation, coating, plating, or sputtering.
- the method of manufacturing the battery cell also includes manufacturing a negative electrode sheet and a separator sheet.
- the method for producing the negative electrode sheet and the separator sheet is the same as the method for producing the electrode sheet and the separator sheet described above.
- the same arrangement of the positive electrode sheet, the negative electrode sheet and the separator sheet includes setting the corresponding tabs on the positive electrode sheet and the negative electrode sheet, the positive electrode sheet, the negative electrode sheet and the separator sheet, and the positive electrode sheet negative electrode sheet is encapsulated in
- the encapsulation method and the like in the outer casing of the battery core can be the same as the method described above, and will not be described herein.
- the present embodiment provides a method for manufacturing a battery cell by disposing a second positive electrode active material layer having a conductivity of not more than 10 ⁇ (-10) S/m in an edge region of the positive electrode substrate, and then in an intermediate portion of the positive electrode sheet.
- the first positive electrode active material layer is disposed such that the second positive electrode active material layer surrounds the first positive electrode active material layer, which can reduce the conductivity of the edge portion of the positive electrode sheet substrate, thereby weakening the redox reaction between the positive electrode sheet and the edge portion of the negative electrode sheet.
- the phenomenon of lithium metal deposition at the edge of the negative electrode sheet can be alleviated; further, the second positive electrode active material layer can be disposed as an insulating layer to avoid redox reaction between the positive electrode sheet and the edge portion of the negative electrode sheet, thereby preventing lithium from occurring at the edge of the negative electrode sheet.
- the phenomenon of metal deposition; further, the size of the positive electrode sheet, the negative electrode sheet, and the separator sheet can be set to the same size, so that the positive electrode sheet, the negative electrode sheet, and the diaphragm sheet are conveniently aligned during assembly, thereby reducing the jig or alignment.
- the number of tools can therefore reduce assembly tools and reduce manufacturing costs.
- FIG. 3 is a schematic flow chart of still another embodiment of a method for manufacturing a battery cell according to the present application.
- the battery core includes a positive electrode sheet, and the manufacturing method of the battery core is as follows:
- the method of providing the positive electrode sheet substrate and the material of the positive electrode sheet substrate in this step are the same as those described in the previous step S101, and will not be described herein.
- a positive electrode active material is provided on a surface of the positive electrode sheet substrate to form a first positive electrode active material layer.
- step S302 is continued. That is, the first positive electrode active material layer is formed on the surface of the positive electrode sheet substrate, and the material of the first positive electrode active material layer and the arrangement on the positive electrode substrate may be the same as those described above, and will not be described herein.
- step S303 is continued. That is, after the first positive electrode active material layer is provided on the positive electrode sheet substrate, the positive electrode active material substance in the edge region of the first positive electrode active material layer is removed, and then the conductivity is set to be not more than 10 ⁇ in the region where the positive electrode active material is removed ( -10) A second positive active material layer of S/m.
- the positive electrode active material at the edge of the first positive electrode active material layer may be cut off by laser burn-off; or the active material in the edge region of the first positive electrode active material layer may be corroded or dissolved and removed by using a reagent.
- the method of manufacturing the battery cell also includes manufacturing a negative electrode sheet and a separator sheet.
- the method for producing the negative electrode sheet and the separator sheet is the same as the method for producing the electrode sheet and the separator sheet described above.
- the same arrangement of the positive electrode sheet, the negative electrode sheet and the separator sheet includes setting the corresponding tabs on the positive electrode sheet and the negative electrode sheet, the positive electrode sheet, the negative electrode sheet and the separator sheet, and the positive electrode sheet negative electrode sheet is encapsulated in
- the encapsulation method and the like in the outer casing of the battery core can be the same as the method described above, and will not be described herein.
- a first positive electrode active material layer is disposed on a surface of the positive electrode sheet substrate, and then the positive electrode active material at the edge of the first positive electrode active material layer is removed, and then the positive electrode active material is removed.
- the second positive electrode active material layer having a conductivity of not more than 10 ⁇ (-10) S/m is disposed so that the second positive electrode active material layer surrounds the first positive electrode active material layer, and the edge portion of the positive electrode substrate can be reduced.
- the second positive electrode active material layer may be provided as an insulating layer to avoid the positive electrode sheet and The redox reaction occurs in the edge region of the negative electrode sheet, so that the phenomenon of lithium metal deposition on the edge of the negative electrode sheet can be prevented; further, the size of the positive electrode sheet, the negative electrode sheet, and the separator sheet can be set to the same size, so that the positive electrode sheet and the negative electrode
- the sheet and the diaphragm are easy to position when assembled, so that the number of clamps or alignment tools can be reduced. This can reduce the tool assembly, reducing the manufacturing cost.
- FIG. 4 is a schematic flow chart of still another embodiment of a method for manufacturing a battery cell according to the present application.
- the battery core includes a positive electrode sheet, and the manufacturing method of the battery core is as follows:
- the method for providing the positive electrode substrate in this step is the same as the method for providing the positive electrode substrate as described above.
- a first positive electrode active material layer is provided on a surface of the positive electrode sheet substrate.
- step S402 is continued. That is, the first positive electrode active material layer is formed on the surface of the positive electrode sheet substrate, and the material of the first positive electrode active material layer and the arrangement on the positive electrode substrate may be the same as those described above, and will not be described herein.
- S403 Deactivating the edge region of the first positive electrode active material layer to form a second positive electrode active material layer such that the conductivity of the second positive electrode active material layer is not more than 10 ⁇ (-10) S/m.
- step S403 is continued. That is, after the first positive electrode active material layer is disposed on the surface of the positive electrode sheet substrate, the edge of the first positive electrode active material layer is deactivated, so that the deactivated region is formed to have a conductivity of not more than 10 ⁇ (- 10) A second positive active material layer of S/m.
- the positive electrode active material in the edge region of the first positive electrode active material layer may be subjected to heat treatment by a local heat treatment, for example, a positive electrode active material in an edge region of the first positive electrode active material layer by laser irradiation heating.
- the heat treatment is performed such that the conductivity of the heat-treated first cathode active material layer is lowered, so that the edge region of the first cathode active material layer finally forms a second cathode active material having a conductivity of not more than 10 ⁇ (-10) S/m. Floor.
- the conductivity of the positive electrode active material in the edge region of the first positive electrode active material layer can be completely removed to form an insulating layer.
- the method of manufacturing the battery cell also includes manufacturing a negative electrode sheet and a separator sheet.
- the method for producing the negative electrode sheet and the separator sheet is the same as the method for producing the electrode sheet and the separator sheet described above.
- the same arrangement of the positive electrode sheet, the negative electrode sheet and the separator sheet includes setting the corresponding tabs on the positive electrode sheet and the negative electrode sheet, the positive electrode sheet, the negative electrode sheet and the separator sheet, and the positive electrode sheet negative electrode sheet is encapsulated in
- the encapsulation method and the like in the outer casing of the battery core can be the same as the method described above, and will not be described herein.
- the present embodiment provides a method for manufacturing a battery cell by disposing a first positive electrode active material layer on the surface of the positive electrode sheet substrate, and then deactivating the positive electrode active material at the edge of the first positive electrode active material layer, so that the first A positive electrode active material layer edge forms a second positive electrode active material layer having a conductivity of not more than 10 ⁇ (-10) S/m, and at the same time, the second positive electrode active material layer surrounds the first positive electrode active material layer, thereby reducing the positive electrode The conductivity of the edge portion of the substrate, thereby weakening the redox reaction between the positive electrode sheet and the edge portion of the negative electrode sheet, thereby reducing the phenomenon of lithium metal deposition at the edge of the negative electrode sheet; further, the positive electrode activity at the edge of the first positive electrode active material layer The material is completely removed, so that the edge of the first positive electrode active material layer forms an insulating layer to avoid redox reaction between the positive electrode sheet and the edge portion of the negative electrode sheet, thereby preventing lithium metal deposition from occurring at
- the size of the sheet, the negative electrode sheet, and the separator sheet are set to the same size, so that the positive electrode sheet When the negative electrode sheet and a separator sheet alignment easy assembly, thereby reducing the number of bits jig or tool, assembly tool can be reduced, reducing the manufacturing cost.
- FIG. 1 to FIG. 4 provide a method for manufacturing four types of cells, which are manufactured by setting a conductivity of not more than 10 ⁇ (-10)S in the edge region of the positive electrode sheet.
- the second positive active material layer of /m reduces the conductivity of the edge of the positive electrode sheet to weaken the redox reaction of the edge regions of the positive electrode sheet and the negative electrode sheet, thereby alleviating the problem of lithium metal deposition at the edge of the negative electrode sheet.
- the difference is that the method of providing the second positive electrode active material layer having a small conductivity in the edge region of the positive electrode sheet is different.
- FIG. 5 is a schematic structural diagram of an embodiment of a battery cell provided by the present application
- FIG. 6 is a battery core shown in FIG. A cross-sectional view of a section
- Fig. 7 is a schematic structural view of a battery unit of Fig. 6.
- the battery cell 200 is used in a battery.
- the battery cell 200 includes a positive electrode sheet 210, a negative electrode sheet 220, and a diaphragm sheet 230.
- the adjacent positive electrode sheet 210, the diaphragm sheet 230, and the negative electrode sheet 220 may constitute one battery unit.
- the separator sheet 230 is disposed between the positive electrode sheet 210 and the negative electrode sheet 220 for separating the positive electrode sheet 210 and the negative electrode sheet 220.
- the positive electrode sheet 210 includes a positive electrode sheet substrate 216 and a positive electrode active material layer disposed on a surface of the positive electrode sheet substrate, wherein the positive electrode active material layer includes a first positive electrode active material layer 212 and a second positive electrode active material layer 211, wherein the second positive electrode active material layer 211 is disposed in an edge region of the first positive electrode active material layer 212 and surrounds the first positive electrode active material layer 212, and the conductivity of the second positive electrode active material layer 211 is not more than 10 ⁇ (-10) S/m.
- the second positive active material layer 211 having a conductivity of not more than 10 ⁇ (-10) S/m at the edge portion of the positive electrode sheet 210, when the battery is normally operated, the positive electrode sheet 210 and the negative electrode are provided.
- the redox reaction between the edges of the sheet 220 is weakened, and the deposition of lithium metal at the edge of the negative electrode sheet 220 can be alleviated, so that the performance of the battery core can be improved and the life of the battery core can be increased.
- the second positive electrode active material layer 211 can be provided as an insulating layer, so that redox generation between the positive electrode sheet 210 and the edge of the negative electrode sheet 220 can be avoided, so that lithium metal deposition problem can be prevented at the edge of the negative electrode sheet 220, so that it can be further Improve the performance of the battery and increase the life of the battery.
- the manufacturing method of the positive electrode sheet 210, the negative electrode sheet 220, and the separator sheet is referred to the battery manufacturing method described above, and will not be described herein.
- the first positive electrode active material layer 212 and the second positive electrode active material layer 211 are provided on the surface of the positive electrode sheet substrate 216.
- the first positive electrode active material layer 212 and the second positive electrode active material layer 211 may be disposed on both sides of the positive electrode sheet substrate 216, wherein the first positive electrode active material layer 212 on both sides of the positive electrode substrate 216 may be symmetrically disposed, and the positive electrode substrate
- the second positive electrode active material layers 211 on both sides of the 216 may also be symmetrically disposed.
- the manner in which the second positive electrode active material layer 211 is disposed on the positive electrode sheet 210 includes the following.
- FIG. 8 is a schematic structural diagram of an embodiment of a positive electrode sheet in the battery unit provided in FIG.
- the surface of the positive electrode sheet substrate 216 of the positive electrode sheet 210 is provided with a first positive electrode active material layer 212 and a second positive electrode active material layer 211, wherein the second positive electrode active material layer 211 is disposed at an edge region of the positive electrode sheet substrate 216, and The second positive electrode active material layer 211 forms a sealed annular region to surround the first positive electrode active material layer 212.
- This method is more suitable for laminated cells. This solution is applicable to the case where the positive electrode sheet 210 and the negative electrode sheet 220 have the same size.
- the positive electrode sheet 210 and the negative electrode sheet 220 may be assembled with the separator sheet 230, and the positive electrode sheet 210 and the negative electrode may appear. All of the edges of the sheet 220 are aligned, so that there is a possibility that lithium deposition occurs in the edge regions of the negative electrode sheet 220, so that the first positive electrode active material layer 212 can be formed by the second positive electrode active material layer 211 forming a sealed annular region. Surrounding, thereby improving the problem of lithium deposition at the edge of the negative electrode sheet.
- FIG. 9 is a schematic structural diagram of another embodiment of the positive electrode sheet in the battery unit provided in FIG.
- the positive electrode sheet 210 also includes a positive electrode sheet substrate 216, and the surface of the positive electrode sheet substrate 216 is also provided with a first positive electrode active material layer 212 and a second positive electrode active material layer 211.
- the difference from the positive electrode sheet described in FIG. 5 is that the second positive electrode active material layer 212 is disposed in a partial region of the edge of the positive electrode sheet substrate 216, and the second positive electrode active material layer 212 partially surrounds the first positive electrode active material layer 211, That is, the second positive electrode active material layer 212 is not a closed annular structure.
- the second positive electrode active material layer 212 may be disposed on an edge region corresponding to the three sides of the positive electrode sheet 210.
- This embodiment is applicable to the case where the positive electrode sheet 210 and the negative electrode sheet 220 are different in size, wherein the three sides of the positive electrode sheet 210 on which the second positive electrode active material layer 212 is disposed are aligned with the corresponding three sides of the negative electrode sheet 220, and the positive electrode sheet 210 is not disposed.
- the second positive electrode active material layer 212 is shifted from the corresponding side of the negative electrode sheet 220, so that the lithium deposition problem at the edge of the negative electrode sheet 220 can also be improved.
- FIG. 10 is a schematic structural diagram of still another embodiment of the positive electrode sheet in the battery unit provided in FIG.
- the positive electrode sheet 210 also includes a positive electrode sheet substrate 216, and the surface of the positive electrode sheet substrate 216 is also provided with a first positive electrode active material layer 212 and a second positive electrode active material layer 211.
- the difference from the positive electrode sheet described in FIG. 5 is that the second positive electrode active material layer 212 is provided on the edge regions of both sides of the positive electrode sheet substrate 216.
- the two sides are aligned, and the second positive electrode active material layer 212 is not disposed on the positive electrode sheet 210 while being shifted from the corresponding side of the negative electrode sheet 220, so that the lithium deposition problem at the edge of the negative electrode sheet 220 can also be improved.
- the positive electrode sheet 210, the negative electrode sheet 220, and the separator sheet 230 may be provided in the same size.
- the edges of the three can be aligned.
- the positive electrode tab 210 is further provided with a positive electrode tab 214
- the negative electrode tab 220 is also provided with a negative electrode tab 224
- the positive electrode tab 214 is electrically connected to the positive electrode tab substrate 216, and the negative electrode tab 224 and the negative electrode.
- the substrate is electrically connected.
- the positive electrode tab 214 and the negative electrode tab 224 respectively correspond to the positive and negative poles of the battery core 200, that is, the battery core 200 completes the charging and discharging process through the positive electrode tab 214 and the negative electrode tab 224.
- the battery cell 200 further includes a housing 240 that is provided with an accommodating space 241 for arranging the positive electrode tab 210, the negative electrode tab 220, and the diaphragm sheet 230.
- a housing 240 that is provided with an accommodating space 241 for arranging the positive electrode tab 210, the negative electrode tab 220, and the diaphragm sheet 230.
- the electrolyte is to cause the positive electrode sheet 210 and the negative electrode sheet 220 to perform charge transfer through the electrolyte, so that the entire battery core 200 can be charged and discharged.
- the electrolyte is generally prepared from a high-purity organic solvent, an electrolyte lithium salt (lithium hexafluorophosphate), a necessary additive, and the like under certain conditions and at a certain ratio.
- the positive electrode sheet 210, the negative electrode sheet 220, and the separator sheet 230 are disposed in the accommodating space 241 to be immersed in the electrolyte solution, it is necessary to ensure that the material used in the production of the second active material layer 211 on the positive electrode sheet 210 does not occur with the electrolyte.
- the reaction is either dissolved in the electrolyte.
- the positive electrode sheet 210, the negative electrode sheet 220, and the separator sheet 230 may be sequentially stacked in the order of the positive electrode sheet 210, the separator sheet 230, and the negative electrode sheet 220, and then the stacked positive electrode sheet 210, the separator sheet 230, and the negative electrode are disposed.
- the sheet 220 is wound and formed to form a core of the battery core 200, and then the winding core is disposed in the accommodating space 241; or the positive electrode sheet 210, the diaphragm sheet 230, and the negative electrode sheet 220 may be in accordance with the positive electrode sheet 210, the diaphragm sheet 230, and the negative electrode.
- the sheet 220, the separator sheet 230, the positive electrode sheet 210, ... are sequentially stacked to form an electrode sheet assembly required for the battery core, and then the electrode sheet assembly is placed into the accommodating space 241.
- FIG. 11 is a schematic structural diagram of an embodiment of a battery provided by the present application.
- the battery 510 is internally provided with a battery core 510.
- the battery core 510 includes the battery core according to any of the preceding claims, and details are not described herein.
- FIG. 12 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
- a battery 610 is disposed in the electronic device 600.
- the battery 610 includes the battery according to any of the preceding claims, and details are not described herein.
- the embodiment provides an electric core, a manufacturing method thereof, a battery, and an electronic device.
- a second active material layer having a conductivity of not more than 10 ⁇ (-10) S/m at the edge portion of the positive electrode sheet of the battery cell the lithium metal deposition phenomenon of the negative electrode sheet of the battery core can be alleviated, thereby improving the battery core.
- the positive electrode sheet, the negative electrode sheet, and the separator sheet can be set to the same size, so that the positive electrode sheet, the negative electrode sheet, and the diaphragm sheet are simple and convenient when assembled, and no excessive jig or alignment tool is required, thereby simplifying
- the production process improves production efficiency and reduces production costs.
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Abstract
本申请公开了一种电芯及其制造方法、电池以及电子装置。其中电芯制造方法包括：提供正极片基板；在正极片基板表面设置正极活性物质形成第一正极活性物质层；对第一正极活性物质层的边缘区域进行去活性处理而形成第二正极活性物质层，其中，第二正极活性物质层的导电率不大于10^(-10)S/m。通过在电池电芯的正极片边缘区域设置导电率不大于10^(-10)S/m的第二活性物质层，可以减轻电芯的负极片出现锂金属沉积的现象，进而提高了电芯使用寿命。
Description
【技术领域】
本申请涉及电池制造领域，特别是涉及一种电芯及其制造方法、电池以及电子装置。
【背景技术】
随着手机等移动电子产品的不断普及，移动电子产品通常都会采用内置电池设计。其中电池一般都具有电芯，电芯中通常包含有正极片、负极片以及隔膜片，其中正极片、负极片以及隔膜片组装时，正极片、负极片边缘可能会出现边缘对齐的问题，此时正极片、负极片边缘会发生氧化还原反应而导致负极片的边缘出现锂沉积问题。
【发明内容】
本申请提供一种电芯及其制造方法、电池以及电子装置，以解决现有技术中电芯的正极片、负极片边缘对齐时在负极片的边缘出现锂沉积的问题。
为解决上述技术问题，本申请采用的一个技术方案是：提供一种电芯的制造方法，其中电芯制造方法包括：提供正极片基板；在正极片基板表面设置正极活性物质形成第一正极活性物质层；对第一正极活性物质层的边缘区域进行去活性处理而形成第二正极活性物质层，其中，第二正极活性物质层的导电率不大于10^(-10)S/m。
为解决上述技术问题，本申请采用的另一个技术方案是：提供一种电芯，电芯用于电池中，其中，电芯包括正极片，正极片包括正极片基板以及设置于正极片基板表面的正极活性物质层，正极活性物质层包括第一正极活性物质以及第二正极活性物质层，第二正极活性物质层的导电率不大于10^(-10)S/m；第二正极活性物质层设置于正极片基板的边缘区域，第一正极活性物质层设置于除去第二正极活性物质层以外的正极片基板的表面，第二正极活性物质层是由第一正极活性物质层经过去活性处理得到的。
为解决上述技术问题，本申请采用的又一个技术方案是：提供一种电池，其中电池包括前文任一项所述的电芯。
为解决上述技术问题，本申请采用的又一个技术方案是：提供一种电子装置，其中电子装置包括电池，电池包括前文任一项所述的电芯。
本申请的有益效果是：区别于现有技术的情况，本申请提供一种电芯及其制造方法、电池以及电子装置。通过在电芯的正极片边缘部分设置导电率不大于10^(-10)S/m的第二正极活性物质层，可以减轻电芯的负极片出现锂金属沉积的现象，进而提高了电芯使用寿命。
【附图说明】
图1是本申请一种电芯制造方法一实施例的流程示意图；
图2是本申请一种电芯制造方法另一实施例的流程示意图；
图3是本申请一种电芯制造方法又一实施例的流程示意图；
图4是本申请一种电芯制造方法又一实施例的流程示意图；
图5是本申请提供的一种电芯一实施例的结构示意图;
图6是图5所示电芯在A-A’为的截面的剖视图;
图7是图6中一个电池单元的结构示意图;
图8是图7提供的电池单元中正极片一实施例的结构示意图；
图9是图7提供的电池单元中正极片另一实施例的结构示意图；
图10是图7提供的电池单元中正极片又一实施例的结构示意图；
图11是本申请提供的一种电池一实施例的结构示意图；
图12是本申请提供的一种电子装置一实施例的结构示意图。
【具体实施方式】
为使本申请解决的技术问题、采用的技术方案和达到的技术效果更加清楚，下面将结合附图对本申请实施例的技术方案作进一步的详细描述。
在本文中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。
参阅图1，图1是本申请一种电芯制造方法一实施例的流程示意图。其中，电芯制造方法具体步骤如下：
步骤S101：提供正极片基板。
在本步骤中，正极片基板一般为铝箔。其中提供正极片基板的具体步骤为：将铝块制成铝箔，并将铝箔切割成预设的尺寸以形成正极片基板。其中要使铝块变为铝箔主要依靠轧制力轧制成型，即调整辊缝使辊缝保持一定值以使得铝块被轧制成厚度一致的铝箔。
步骤S102：在正极片基板表面设置正极活性物质形成第一正极活性物质层。
在完成步骤S101后，继续进行步骤S102。即，将正极活性物质均匀涂布到正极片基板表面，以形成正极活性物质层；将涂布了正极活性物质的正极片基板切割成制造正极片所需要的尺寸；在完成切割的正极片基板上的预设位置焊接正极极耳，然后经过后续处理完成正极片的制造。正极活性物质可以包括含锂的金属化合物或可嵌锂的金属化合物，如锂钴氧化物、锂锰氧化物、锂镍锰氧化物、锂镍锰钴氧化物、锂铁磷酸盐、锂锰磷酸盐、碳黑以及聚偏氟乙烯（PVDF）。
步骤S103：在第一正极活性物质层的边缘区域设置第二正极活性物质层，其中第二正极活性物质层的导电率不大于10^(-10)S/m。
在完成步骤S102后，继续进行步骤S103。即，在第一正极活性物质层的边缘区域设置第二正极活性物质层，其中第二正极活性物质层的导电率不大于10^(-10)S/m。第一正极活性物质层的导电率可以大于第二正极活性物质层的导电率，从而可以提高正极片的中间区域的导电性使得正极片的充放电效率提高。本步骤中可以采用在第一正极活性物质层的边缘区域上进行渗胶处理，使得胶渗入第一正极活性物质层的边缘区域的正极活性物质中以形成第二正极活性物质层。通过选取导电性小的胶可以使第二正极活性物质层的导电率不大于10^(-10)S/m，从而可以减弱正极片边缘部分的导电性，进而可以减弱正极片边缘与负极片的边缘进行的氧化还原反应，从而减轻负极片出现锂金属沉积的问题。
进一步的，在进行边缘渗胶处理的时候可以采用绝缘胶，使得绝缘胶渗透入第一正极活性物质层中，将正极活性物质包裹起来以形成不导电的第二活性物质层。在其它实施例中，还可以采用将绝缘胶覆盖在第一正极活性物质层的边缘区域的表面以形成不导电的第二活性物质层。可以理解的是，在正极片边缘形成不导电的第二活性物质层可以防止正极片边缘与负极片的边缘出现氧化还原反应，从而可以避免负极片出现锂金属沉积问题。其中，绝缘胶可以是石蜡、PE胶或者PP胶等，绝缘胶同时需要一定的润湿性，以便绝缘胶更加容易的粘贴到第一正极活性物质层的边缘区域。
在本步骤中，还可以采用蒸镀、涂布、电镀或者溅镀的方式将第二正极活性物质层设置到正极片基板的边缘区域。其方法主要包括采用阻隔物挡住第一正极活性物质层的中间区域，而不遮挡边缘区域，然后通过蒸镀、涂布、电镀或者溅镀等成型工艺将导电性小的材料设置到正极片基板上没有被遮挡的边缘区域，从而形成导电率不大于10^(-10)S/m的第二正极活性物质层。其中，用于形成第二正极活性物质层的材料包括有机材料，例如石蜡、PE胶、PP胶中的至少一者；或者形成第二正极活性物质层的材料包括金属化合物，例如氧化铝、氧化镁、或者硫酸钡中的至少一者。
由于电芯还包括负极片以及隔膜片，因此在本实施例所述的电芯制造方法中，电芯的制造方法还包括制造负极片以及隔膜片。其中负极片的制造方法包括：提供负极片基板，在负极片基板表面涂布负极活性物质以形成负极活性物质层，然后将负极片切割成预定的尺寸。其中负极基板可以是铜箔，负极活性物质可以包括石墨、羧甲基纤维素钠（CMC）以及丁苯橡胶（Styrene-butadiene
rubber，SBR）金属锂、可储锂金属粉体、可储锂金属氧化物或各类碳材料等。隔膜片的制造方法主要是将隔膜片切割成预定的尺寸。
在本实施例中所述的电芯电芯制造方法中，还需在正极片及负极片上分别设置正极极耳及负极极耳。即在正极片上设置正极极耳，在负极片上设置负极极耳。其中在正极片上设置正极极耳的方法与在负极片上设置负极极耳的方法可以相同，以在正极片上设置正极极耳的方法为例。在正极片上设置正极极耳的方法包括：在对正极片基板切割时，将正极片基板切割成具有凸起部分的片材，其中凸起部分可以作为正极极耳，即正极极耳可以与正极片基板一体设置；或者将制成的正极极耳焊接到在正极片的预设位置上，使得正极极耳与正极片上的第一正极活性物质层实现电连接。
以上电芯的制造方法为正极片、负极片以及隔膜片的制造方法。在完成正极片、负极片以及隔膜片的制造后，还需要将隔膜片设置到正极片及负极片之间，通过依次堆叠设置正极片、隔膜片以及负极片，然后将堆叠设置完成的正极片、隔膜片以及负极片卷绕成型，形成电芯的卷芯；或者将正极片、隔膜片以及负极片按照正极片、隔膜片、负极片、隔膜片、正极片.…..的顺序堆叠形成电芯所需要的结构。
将隔膜片设置到正极片以及负极片之间之后还需对正极片、负极片以及隔膜片进行封装，即，将隔膜片设置到正极片以及负极片之间之后，对得到的正极片、隔膜片以及负极片的组合体进行封装。其封装的具体方法是设置一个外壳，然后在外壳的内部设置容置空间从而将正极片、隔膜片以及负极片设置到容置空间中，然后对外壳的容置空间进行密封，从而将正极片、隔膜片以及负极片密封在外壳的内部容置空间中。
其中，在对容置空间进行密封之前，还需要向容置空间中注入电解液，使得电解液浸没正极片、隔膜片以及负极片。正极片及负极片通过电解液实行电荷传输，从而可以实现整个电芯能够充放电。
在本实施例中，正极片、负极片以及隔膜片可以被切割为相同的尺寸，使得正极片、负极片以及隔膜片组装时更加方便快捷，从而提高电芯的制造效率。由于在正极片和/或负极片的边缘设置了第二正极活性物质层且第二正极活性物质层的导电性不大于10^(-10)S/m，因此可以防止正极片、负极片以及隔膜片尺寸相同的时候负极片的边缘处可能出现锂沉积的问题。同时，由于正极片、负极片以及隔膜片的尺寸相同，在正极片、负极片以及隔膜片的组装时可以减少夹具或者对位工具的数量，因此可以减少组装工具，降低制造成本。
本申请还提供了又一种电芯的制造方法。请参阅图2，图2是本申请提供的一种电芯制造方法另一实施例的流程示意图。其中电芯包括正极片，电池电芯的制造方法具体如下步骤：
S201：提供正极片基板。
本步骤中提供正极片基板的方法以及正极片基板的材质，与前文步骤S101中所述一致，在此不做赘述。
S202：在正极片基板的表面的边缘区域设置第二正极活性物质层，其中第二正极活性物质层的导电率不大于10^(-10)S/m。
在完成步骤S201正极片基板的准备后，继续进行步骤S202。即，在正极片基板的表面的边缘区域形成第二正极活性物质层，同样第二正极活性物质层也可以采用蒸镀、涂布、电镀或者溅镀等成型方式形成于正极片基板的表面的边缘区域。其形成方法为，采用阻挡物将正极片基板的中间区域遮挡住，然后将第二正极活性物质层的材料设置到正极片基板上没有被遮挡的边缘区域，以形成第二正极活性物质层，其中用于形成第二正极活性物质层的材料包括有机材料，例如石蜡、PE胶、PP胶中的至少一者；或者形成第二正极活性物质层的材料包括金属氧化物，例如氧化铝、氧化镁、或者硫酸钡中的至少一者，使得第二正极活性物质层的导电率不大于10^(-10)S/m。
S203：在正极片基板表面除去第二正极活性物质层以外的区域设置第一正极活性物质层。
在步骤S202完成后，继续进行步骤S203。即在正极片基板表面的边缘区域设置第二正极活性物质层后，然后在正极片基板表面除去第二正极活性物质层以外的中心区域设置第一正极活性物质层，使得第二正极活性物质层将第一正极活性物质层包围。本步骤中同样可以采用蒸镀、涂布、电镀或者溅镀等成型工艺形成第一正极活性物质层。
与前文所述的方法相同的，电芯的制造方法同样包括制造负极片以及隔膜片。本方法中负极片及隔膜片的制造方法与前文所述极片及隔膜片的制造方法相同。同样的正极片、负极片以及隔膜片的设置方式，包括在正极片及负极片上分别设置相应的极耳，正极片、负极片以及隔膜片的设置结构，以及正极片负极片隔膜片被封装在电芯的外壳中的封装方式等都可与前文所述的方法相同，在此不做赘述。
因此本实施例提供一种电芯的制造方法，通过在正极片基板的边缘区域设置导电率不大于10^(-10)S/m的第二正极活性物质层，然后在正极片的中间区域设置第一正极活性物质层使得第二正极活性物质层将第一正极活性物质层包围起来，可以减小正极片基板边缘部分的导电性，进而减弱正极片与负极片边缘区域的氧化还原反应，从而可以减轻负极片边缘出现锂金属沉积的现象；进一步的还可以将第二正极活性物质层设置为绝缘层从而避免正极片与负极片边缘区域发生氧化还原反应，因此可以防止负极片边缘出现锂金属沉积的现象；更进一步的，还可以将正极片、负极片以及隔膜片的尺寸设置为相同的尺寸，使得正极片、负极片以及隔膜片组装时对位方便，从而可以减少夹具或者对位工具的数量，因此可以减少组装工具，降低制造成本。
本申请还提供了又一种电芯的制造方法。请参阅图3，图3是本申请提供的一种电芯制造方法又一实施例的流程示意图。其中电芯包括正极片，电芯的制造方法具体如下步骤：
S301：提供正极片基板。
本步骤中提供正极片基板的方法以及正极片基板的材质，与前文步骤S101中所述一致，在此不做赘述。
S302：在正极片基板的表面设置正极活性物质以形成第一正极活性物质层。
在完成步骤S301正极片基板的准备后，继续进行步骤S302。即，在正极片基板的表面形成第一正极活性物质层，其中第一正极活性物质层的材质及在正极片基板上的设置方式可以与前文所述的一致，在此不做赘述。
S303：将第一正极活性物质层的边缘区域的正极活性物质去除，然后在去除的正极活性物质的区域设置导电率不大于10^(-10)S/m的第二正极活性物质层。
在完成步骤S302正极片基板的准备后，继续进行步骤S303。即，当在正极片基板上设置第一正极活性物质层后，将第一正极活性物质层的边缘区域的正极活性物质物质去除，然后在去除正极活性物质的区域设置导电率不大于10^(-10)S/m的第二正极活性物质层。在本步骤中可以采用激光烧除的方式将第一正极活性物质层边缘的正极活性物质切除；或者可以选用试剂将第一正极活性物质层边缘区域的活性物质腐蚀或者溶解去除。
与前文所述的方法相同的，电芯的制造方法同样包括制造负极片以及隔膜片。本方法中负极片及隔膜片的制造方法与前文所述极片及隔膜片的制造方法相同。同样的正极片、负极片以及隔膜片的设置方式，包括在正极片及负极片上分别设置相应的极耳，正极片、负极片以及隔膜片的设置结构，以及正极片负极片隔膜片被封装在电芯的外壳中的封装方式等都可与前文所述的方法相同，在此不做赘述。
本实施例提供的又一种电芯的制造方法，通过在正极片基板的表面设置第一正极活性物质层，然后将第一正极活性物质层边缘的正极活性物质去除，再在去除正极活性物质的区域设置导电率不大于10^(-10)S/m的第二正极活性物质层，使得第二正极活性物质层将第一正极活性物质层包围起来，可以减小正极片基板边缘部分的导电性，进而减弱正极片与负极片边缘区域的氧化还原反应，从而可以减轻负极片边缘出现锂金属沉积的现象；进一步的还可以将第二正极活性物质层设置为绝缘层从而避免正极片与负极片边缘区域发生氧化还原反应，因此可以防止负极片边缘出现锂金属沉积的现象；更进一步的，还可以将正极片、负极片以及隔膜片的尺寸设置为相同的尺寸，使得正极片、负极片以及隔膜片组装时对位方便，从而可以减少夹具或者对位工具的数量，因此可以减少组装工具，降低制造成本。
本申请还提供了又一种电芯的制造方法。请参阅图4，图4是本申请提供的一种电芯制造方法又一实施例的流程示意图。其中电芯包括正极片，电芯的制造方法具体如下步骤：
S401：提供正极片基板。
本步骤中提供正极片基板的方法与前文所述的提供正极片基板的方法相同，其具体准备方法以及材料选取请参考前文实施例。
S402：在正极片基板的表面设置第一正极活性物质层。
在完成步骤S401正极片基板的准备后，继续进行步骤S402。即，在正极片基板的表面形成第一正极活性物质层，其中第一正极活性物质层的材质及在正极片基板上的设置方式可以与前文所述的一致，在此不做赘述。
S403：对第一正极活性物质层的边缘区域进行去活性处理而形成第二正极活性物质层，使得第二正极活性物质层的导电率不大于10^(-10)S/m。
在完成步骤S402后，继续进行步骤S403。即，在正极片基板的表面设置完第一正极活性物质层后，再对第一正极活性物质层的边缘进行去活性处理，使得经过去活性处理后的区域形成导电率不大于10^(-10)S/m的第二正极活性物质层。在本步骤中，可以采用局部热处理的方法，对第一正极活性物质层的边缘区域的正极活性物质进行热处理，例如采用激光照射加热的方式对第一正极活性物质层的边缘区域的正极活性物质进行热处理，使得经过热处理的第一正极活性物质层的导电性降低，以使得第一正极活性物质层的边缘区域最终形成导电率不大于10^(-10)S/m的第二正极活性物质层。本步骤中还可以将第一正极活性物质层的边缘区域的正极活性物质的导电性完全去除而形成绝缘层。
与前文所述的方法相同的，电芯的制造方法同样包括制造负极片以及隔膜片。本方法中负极片及隔膜片的制造方法与前文所述极片及隔膜片的制造方法相同。同样的正极片、负极片以及隔膜片的设置方式，包括在正极片及负极片上分别设置相应的极耳，正极片、负极片以及隔膜片的设置结构，以及正极片负极片隔膜片被封装在电芯的外壳中的封装方式等都可与前文所述的方法相同，在此不做赘述。
因此本实施例提供又一种电芯的制造方法，通过在正极片基板的表面设置第一正极活性物质层，然后对第一正极活性物质层边缘的正极活性物质进行去活性处理，以使得第一正极活性物质层边缘形成导电率不大于10^(-10)S/m的第二正极活性物质层，同时使得第二正极活性物质层将第一正极活性物质层包围起来，可以减小正极片基板边缘部分的导电性，进而减弱正极片与负极片边缘区域的氧化还原反应，从而可以减轻负极片边缘出现锂金属沉积的现象；进一步的还可以将第一正极活性物质层边缘的正极活性物质完全去除使得第一正极活性物质层的边缘形成绝缘层从而避免正极片与负极片边缘区域发生氧化还原反应，因此可以防止负极片边缘出现锂金属沉积的现象；更进一步的，还可以将正极片、负极片以及隔膜片的尺寸设置为相同的尺寸，使得正极片、负极片以及隔膜片组装时对位方便，从而可以减少夹具或者对位工具的数量，因此可以减少组装工具，降低制造成本。
综上所述，图1至图4提供了四种电芯的制造方法，这四种的电芯的制造方法都是通过在正极片的边缘区域设置导电率不大于10^(-10)S/m的第二正极活性物质层，从而降低正极片边缘的导电性，来减弱正极片与负极片边缘区域的氧化还原反应，因此可以减轻负极片边缘出现锂金属沉积的问题。其区别点在于在正极片的边缘区域设置导电性小的第二正极活性物质层的方法不同。
本实施例还提供了一种电芯，请参阅图5到图7，图5是本申请提供的一种电芯一实施例的结构示意图，图6是图5所示电芯在A-A’的截面的剖视图，图7是图6中一个电池单元的结构示意图。其中，电芯200运用于电池中，电芯200包括正极片210、负极片220以及隔膜片230，相邻的正极片210、隔膜片230以及负极片220可以构成一个电池单元。其中隔膜片230设置在正极片210及负极片220之间用于隔开正极片210及负极片220。正极片210包括正极片基板216以及设置在正极片基板表面的正极活性物质层，其中正极活性物质层包括第一正极活性物质层212以及第二正极活性物质层211，其中第二正极活性物质层211设置在第一正极活性物质层212的边缘区域并将第一正极活性物质层212包围，第二正极活性物质层211的导电率不大于10^(-10)S/m。
因此在本实施例中，通过在正极片210的边缘部分设置导电率不大于10^(-10)S/m的第二正极活性物质层211，使得电芯正常工作时，正极片210与负极片220边缘之间的氧化还原反应得到削弱，可以减轻负极片220边缘的锂金属的沉积问题，因此可以提高电芯的性能，增加电芯的使用寿命。进一步的还可以将第二正极活性物质层211设置为绝缘层，从可以避免正极片210与负极片220边缘之间发生氧化还原，因此可以防止负极片220边缘出现锂金属沉积问题，因此可以进一步的提高电芯的性能，增加电芯的使用寿命。
在本实施例中，正极片210、负极片220以及隔膜片的制造方法请参考前文所述的电芯制造方法，在此不做赘述。其中，正极片基板216表面设置有第一正极活性物质层212以及第二正极活性物质层211。正极片基板216的两侧的表面可以都设置第一正极活性物质层212以及第二正极活性物质层211，其中正极片基板216两侧的第一正极活性物质层212可以对称设置，正极片基板216两侧的第二正极活性物质层211也可以对称设置。其中，第二正极活性物质层211在正极片210的设置方式包括如下方案。
请参考图7与图8，图8是图7提供的电池单元中正极片一实施例的结构示意图。其中，正极片210的正极片基板216的表面设置有第一正极活性物质层212以及第二正极活性物质层211，其中，第二正极活性物质层211设置于正极片基板216的边缘区域，且第二正极活性物质层211形成一个密封的环形区域将第一正极活性物质层212包围。此种方法较适用于叠片式排列的电芯。此方案适用于正极片210与负极片220尺寸相同的情况，当正极片210与负极片220尺寸相同时，将正极片210与负极片220与隔膜片230组装后可能会出现正极片210与负极片220所有的边缘均出现对齐的现象，因此可能出现负极片220边缘区域均产生锂沉积的问题，因此可以通过第二正极活性物质层211形成一个密封的环形区域将第一正极活性物质层212包围，从而可以改善负极片边缘锂沉积的问题。
请参考图7与图9，图9是图7提供的电池单元中正极片另一实施例的结构示意图。其中正极片210同样包括正极片基板216，正极片基板216的表面同样设置有第一正极活性物质层212以及第二正极活性物质层211。与图5所述的正极片的区别在于，第二正极活性物质层212设置在正极片基板216的边缘的部分区域，且第二正极活性物质层212将第一正极活性物质层211部分包围，即第二正极活性物质层212并非为闭合的环形结构，例如在本实施例中，第二正极活性物质层212可以设置在正极片210的3条边对应的边缘区域。此方案适用于正极片210与负极片220尺寸不同的情况，其中正极片210上设置了第二正极活性物质层212的3条边与负极片220相应的3边对齐，正极片210上未设置第二正极活性物质层212边与负极片220相应的边相错开，因此也可以改善负极片220边缘的锂沉积问题。
请参考图7与图10，图10是图7提供的电池单元中正极片又一实施例的结构示意图。其中正极片210同样包括正极片基板216，正极片基板216的表面同样设置有第一正极活性物质层212以及第二正极活性物质层211。与图5所述的正极片的区别在于，第二正极活性物质层212设置在正极片基板216的两边的边缘区域。与图9所述的方案相同的，此方案同样适用于正极片210与负极片220尺寸不同的情况，其中正极片210上设置了第二正极活性物质层212的2条边与负极片220相应的2边对齐，正极片210上未设置第二正极活性物质层212边与负极片220相应的边相错开，因此同样也可以改善负极片220边缘的锂沉积问题。
本实施例中，为了提高电芯200制造效率，还可以将正极片210、负极片220以及隔膜片230设置为相同的尺寸。使得正极片210、负极片220以及隔膜片230组装时三者的边缘可以对齐。
在本实施例中，正极片210上还设置有正极极耳214，负极片220上同样也设置有负极极耳224，其中正极极耳214与正极片基板216电连接，负极极耳224与负极片基板电连接。正极极耳214及负极极耳224分别对应电芯200的正负极，即，电芯200通过正极极耳214和负极极耳224完成充放电过程。
在本实施例中，电芯200还包括外壳240，外壳240设置有容置空间241用于设置正极片210、负极片220以及隔膜片230。当正极片210、负极片220以及隔膜片230设置到容置空间241中后，还需要向容置空间241中注入电解液，使得正极片210、负极片220以及隔膜片230浸泡在电解液中，电解液的作用是使得正极片210及负极片220通过电解液实行电荷传输，从而可以实现整个电芯200能够充放电。其中电解液一般由高纯度的有机溶剂、电解质锂盐（六氟磷酸锂）、必要的添加剂等原料，在一定条件下，按一定比例配制而成的。
正极片210、负极片220以及隔膜片230被设置到容置空间241中被电解液浸没时，需要保证正极片210上的制造第二活性物质层211时所使用的材料不会与电解液发生反应，或者被溶解到电解液中。
本实施例中，正极片210、负极片220以及隔膜片230可以按照正极片210、隔膜片230、负极片220的顺序依次堆叠设置，然后将堆叠设置完成的正极片210、隔膜片230以及负极片220卷绕成型，形成电芯200的卷芯，然后将卷芯设置到容置空间241中；或者正极片210、隔膜片230以及负极片220也可以按照正极片210、隔膜片230、负极片220、隔膜片230、正极片210.…..的顺序堆叠形成电芯所需要的电极片组件，然后再将电极片组件设置到容置空间241中。
本申请还提供了一种电池，请参阅图11，图11是本申请提供的一种电池一实施例的结构示意图。其中电池500内部设置有电芯510，电芯510包括如前文任一项所述的电芯，在此不做赘述。
本申请还提供了一种电子装置，请参阅图12，图12是本申请提供的一种电子装置一实施例的结构示意图。其中电子装置600内部设置有电池610，电池610包括前文任一项所述的电池，在此不做赘述。
综上所述，本实施例提出了一种电芯及其制造方法、电池以及电子装置。通过在电池电芯的正极片边缘部分设置导电率不大于10^(-10)S/m的第二活性物质层，可以减轻电芯的负极片出现锂金属沉积的现象，进而提高了电芯使用寿命。进一步的，可以将正极片、负极片以及隔膜片设置为相同的尺寸，使得正极片、负极片以及隔膜片组装对位时简单方便，且不需要过多的夹具或者对位工具，因此可以简化制作过程，提高生产效率，降低生产成本。
以上所述仅为本申请的实施例，并非因此限制本申请的专利范围，凡是利用本申请说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本申请的专利保护范围内。
Claims (19)
- 一种电池的电芯制造方法，所述电芯包括正极片，其中，所述电芯制造方法包括：提供正极片基板；在所述正极片基板表面设置正极活性物质形成第一正极活性物质层；对所述第一正极活性物质层的边缘区域进行去活性处理而形成第二正极活性物质层，其中，所述第二正极活性物质层的导电率不大于10^(-10)S/m。
- 根据权利要求1所述的电芯制造方法，其中，所述对所述第一正极活性物质层的边缘区域进行去活性处理的步骤具体包括：对所述第一正极活性物质层的边缘区域进行热处理。
- 根据权利要求1所述的电芯制造方法，其中，所述电芯还包括负极片及隔膜片，所述电芯的制造方法还包括：提供所述负极片及隔膜片；将所述正极片、负极片以及隔膜片切割成相同的尺寸。
- 根据权利要求3所述的电芯制造方法，其中，所述电芯制造方法还包括:在所述正极片上设置正极极耳，在所述负极片上设置负极极耳。
- 根据权利要求4所述的电芯制造方法，其中，所述电芯的制造方法还包括：将所述隔膜片设置到所述正极片及所述负极片之间；对所述隔膜片、所述正极片以及所述负极片进行封装。
- 根据权利要求5所述的电芯制造方法，其中，所述对所述隔膜片、所述正极片以及所述负极片进行封装的步骤具体包括：提供所述电芯的外壳；将所述隔膜片、所述正极片以及所述负极片密封在所述外壳的容置空间中。
- 根据权利要求6所述的电芯制造方法，其中，所述密封所述隔膜片、所述正极片以及所述负极片的步骤之前还包括向所述容置空间中注入电解液。
- 一种电芯，所述电芯用于电池中，其中，所述电芯包括正极片，所述正极片包括正极片基板以及设置于所述正极片基板表面的正极活性物质层，所述正极活性物质层包括第一正极活性物质以及第二正极活性物质层，所述第二正极活性物质层的导电率不大于10^(-10)S/m；所述第二正极活性物质层设置于所述正极片基板的边缘区域，所述第一正极活性物质层设置于除去所述第二正极活性物质层以外的所述正极片基板的表面，所述第二正极活性物质层是由所述第一正极活性物质层经过去活性处理得到的。
- 根据权利要求8所述的电芯，其中，所述去活性处理包括对所述第一正极活性物质层的边缘区域进行热处理。
- 根据权利要求8所述的电芯，其中，电芯还包括负极片及隔膜片，其中所述正极片、负极片以及隔膜片的尺寸相同。
- 根据权利要求10所述的电芯，其中，所述正极片还包括正极极耳，所述负极片还包括负极极耳，所述电芯通过所述正极极耳以及所述负极极耳与外部电路电连接实现充放电；所述隔膜片设置于所述正极片及所述负极片之间，用于将所述正极片及所述负极片隔开；所述电芯还包括外壳，所述外壳设置有容置空间用于容置所述正极片、负极片以及隔膜片，所述容置空间内部还用于设置电解液，所述电解液浸没所述正极片及所述负极片以实现所述正极片及所述负极片之间的电荷传输。
- 一种电池，所述电池内设置有电芯，其中：所述电芯包括正极片，所述正极片包括正极片基板以及设置于所述正极片基板表面的正极活性物质层，所述正极活性物质层包括第一正极活性物质以及第二正极活性物质层，所述第二正极活性物质层的导电率不大于10^(-10)S/m；其中，所述第二正极活性物质层成型方式包括通过对所述第一正极活性物质层的边缘区域进行去活性处理成型。
- 根据权利要求12所述的电池，其中，所述去活性处理包括对所述第一正极活性物质层的边缘区域进行热处理。
- 根据权利要求12所述的电池，其中，电芯还包括负极片及隔膜片，其中所述正极片、负极片以及隔膜片的尺寸相同。
- 根据权利要求14所述的电池，其中，所述正极片还包括正极极耳，所述负极片还包括负极极耳，所述电芯通过所述正极极耳以及所述负极极耳与外部电路电连接实现充放电；所述隔膜片设置于所述正极片及所述负极片之间，用于将所述正极片及所述负极片隔开；所述电芯还包括外壳，所述外壳设置有容置空间用于容置所述正极片、负极片以及隔膜片，所述容置空间内部还用于设置电解液，所述电解液浸没所述正极片及所述负极片以实现所述正极片及所述负极片之间的电荷传输。
- 一种电子装置，所述电子装置包括电池，所述电池内设置有电芯，其中，所述电芯包括正极片，所述正极片包括正极片基板以及设置于所述正极片基板表面的正极活性物质层，所述正极活性物质层包括第一正极活性物质以及第二正极活性物质层，所述第二正极活性物质层的导电率不大于10^(-10)S/m；所述第二正极活性物质层设置于所述正极片基板的边缘区域，所述第一正极活性物质层设置于除去所述第二正极活性物质层以外的所述正极片基板的表面，所述第二正极活性物质层是由所述第一正极活性物质层经过去活性处理得到的。
- 根据权利要求16所述的电子装置，其中，所述去活性处理包括对所述第一正极活性物质层的边缘区域进行热处理。
- 根据权利要求16所述的电子装置，其中，电芯还包括负极片及隔膜片，其中所述正极片、负极片以及隔膜片的尺寸相同。
- 根据权利要求18所述的电子装置，其中，所述正极片还包括正极极耳，所述负极片还包括负极极耳，所述电芯通过所述正极极耳以及所述负极极耳与外部电路电连接实现充放电；所述隔膜片设置于所述正极片及所述负极片之间，用于将所述正极片及所述负极片隔开；所述电芯还包括外壳，所述外壳设置有容置空间用于容置所述正极片、负极片以及隔膜片，所述容置空间内部还用于设置电解液，所述电解液浸没所述正极片及所述负极片以实现所述正极片及所述负极片之间的电荷传输。
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