CN110729447A - Battery cell pole piece and battery cell - Google Patents
Battery cell pole piece and battery cell Download PDFInfo
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- CN110729447A CN110729447A CN201910953151.1A CN201910953151A CN110729447A CN 110729447 A CN110729447 A CN 110729447A CN 201910953151 A CN201910953151 A CN 201910953151A CN 110729447 A CN110729447 A CN 110729447A
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- pole piece
- insulating glue
- thickness
- area
- lithium
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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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
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- 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
Abstract
The invention belongs to the technical field of battery production, and particularly relates to a battery core pole piece which comprises a pole piece and a pole lug, wherein the pole piece is provided with a coating area and a hollow foil area, the pole lug is accommodated in the hollow foil area, the pole lug is covered with first insulating glue, the coating area is provided with a plurality of grooves matched with the first insulating glue at intervals, the first insulating glue is accommodated in the grooves, and the bottom surface of each groove is provided with second insulating glue. The invention solves the problem of over-thickness of the rubberizing position after winding the pole piece, is beneficial to reducing the overall thickness of the battery core and improving the energy density of the battery, thereby improving the quality of the battery. In addition, the invention also discloses a battery cell.
Description
Technical Field
The invention belongs to the technical field of battery production, and particularly relates to a battery core pole piece and a battery core.
Background
Nowadays, green, high-efficiency secondary batteries are vigorously developed in various countries. The lithium ion battery as a novel secondary battery has the advantages of large energy density and power density, high working voltage, light weight, small volume, long cycle life, good safety, environmental protection and the like, and has wide application prospect in the aspects of portable electric appliances, electric tools, large-scale energy storage, electric traffic power supplies and the like.
In the manufacturing process of the conventional lithium ion battery cell, in order to avoid the problem of potential safety hazard reduction due to lithium precipitation in the charging process of the positive electrode and the negative electrode, auxiliary adhesive tapes are adhered to the positive electrode and the negative electrode to prevent the lithium ion from being embedded, the safety risk of lithium precipitation is avoided during charging, meanwhile, in order to protect the region with a thin coating, the region needs to be covered by the auxiliary adhesive tapes, the adhesive position leads to the increase of the whole thickness of a rolled core, in addition, the problem of raised steps or burrs is generated after the welding of a tab, in order to avoid the safety risk caused by the contact short circuit of the positive electrode and the negative electrode due to the piercing of the burrs of the step through the diaphragm, the basic design is that the adhesive tapes are additionally arranged at the tab welding position to cover the welding position, the problem of steps or burrs is prevented, the thickness of the tab welding position is increased again, therefore, the, this can result in the jelly roll being too thick, resulting in a reduced energy density.
Disclosure of Invention
One of the objects of the present invention is: the battery core pole piece solves the problem of super-thick rubberizing position after pole piece winding, and is beneficial to reducing the overall thickness of a battery core and improving the energy density of a battery, thereby improving the quality of the battery.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a battery core pole piece, includes pole piece and utmost point ear, the pole piece is provided with coating district and empty paper tinsel district, utmost point ear holding in empty paper tinsel district, utmost point ear covers there is first insulating glue, coating district separates to be provided with a plurality of and first insulating glue complex recess, first insulating glue holding in the recess, the bottom surface of recess is provided with the second insulating glue.
As an improvement of the battery cell pole piece of the present invention, the two empty foil regions are symmetrically disposed on two sides of the pole piece, wherein the areas of the empty foil region on one side and the empty foil region on the other side are equal. Empty foil district symmetry sets up in the two sides of pole piece, is convenient for not only form utmost point ear mid-mounting structure or many utmost point ear structure, still helps welding utmost point ear on the pole piece, improves the steadiness between the two, reduces the influence of welding utmost point ear to electric core thickness, has improved the volume energy density of battery, simultaneously, is convenient for get rid of the coating on utmost point ear surface through scraper technology or laser cleaning process, forms the empty foil district of positive and negative two sides, helps reduction in production cost.
As an improvement of the battery cell pole piece of the present invention, the two grooves are disposed at intervals on two sides of the pole piece, and the two grooves respectively correspond to the first insulating glue on two sides of the anode piece or the first insulating glue on two sides of the cathode piece. Because the pole piece comprises the anode piece and the cathode piece, if the pole piece is the cathode piece, one groove of the cathode piece corresponds to the first insulating glue on one surface of the anode piece, the other groove of the cathode piece corresponds to the first insulating glue on the other surface of the anode piece, and the first insulating glue is equivalently embedded into the groove, the problem of over-thickness of a winding core caused by the thickness superposition of insulating gummed paper is avoided, and the energy density of the battery core is effectively improved; if the pole piece is the anode strip, one of them recess of anode strip corresponds with the first insulating cement of negative pole piece one side, another recess of anode strip corresponds with the first insulating cement of negative pole piece another side, the recess lid that is equivalent to the anode strip connects in the first insulating cement of negative pole piece one side, also include the first insulating cement of the another side of negative pole piece, the problem of the core super-thickness of rolling up that leads to because of the thickness stack of insulated adhesive paper has been avoided, for example, divide in the top surface and the bottom surface of anode strip in two recesses, when convoluteing, the outstanding step of the first insulating cement of negative pole piece can be accomodate by the step, thereby reduce the influence of first insulating cement to electric core thickness, the volume energy density of battery has been improved.
As an improvement of the battery cell pole piece, the length of the first insulating glue is greater than that of the second insulating glue; and/or the length of the first insulating glue is smaller than that of the second insulating glue. When the pole piece is the positive pole piece, the length of first insulating glue is less than the length of second insulating glue, when the pole piece is the negative pole piece, the length of first insulating glue is greater than the length of second insulating glue, but this embodiment does not use this as the limit, the length of first insulating glue also can equal to the length of second insulating glue, it can to satisfy the length that is not more than the recess, first insulating glue can avoid producing the lithium in positive negative pole charging process and analyse and reduce the potential safety hazard problem, so can paste first insulating glue at pole piece itself and can prevent the embedding of lithium ion, and avoided the lithium of analysing the safety risk when charging.
As an improvement of the battery cell pole piece, the height of the first insulating glue and the second insulating glue after being overlapped is equal to the depth of the groove. The height that highly is equal to the degree of depth of recess after first insulating glue and the superposition of second insulating glue prevents that first insulating glue from gluing with the second insulating glue after the superposition, causes the paper adhesive of whole core positive negative pole utmost point ear position and superposes, causes utmost point ear thickness super-thick, even causes the super thick energy density reduction of core thickness of rolling up.
As an improvement of the cell pole piece of the present invention, a distance from the bottom surface of the groove to a current collector of the pole piece is less than or equal to the thickness of the coating region. The distance less than or equal to of the mass flow body of pole piece is distinguished to the bottom surface of recess, has avoided the super thick problem of core of rolling up that leads to because of the thickness stack of insulated adhesive paper, effectively improves the energy density of electric core, ensures that the recess can the holding first insulating glue and second insulating glue, improves the quality of battery.
As an improvement of the cell pole piece of the present invention, the thicknesses of the first insulating glue and the second insulating glue are both 10 to 20 μm, the thickness of the coating region is greater than or equal to the thicknesses of the first insulating glue and the second insulating glue, and the thickness of the coating region is at least 60 μm. The thickness of the first insulating glue and the second insulating glue is limited, so that the first insulating glue and the second insulating glue are prevented from being too thin, the mechanical property is reduced, and the normal use of the battery cell is influenced; meanwhile, the first insulating glue and the second insulating glue are prevented from being too thick, so that the production cost of the battery is increased, the insulating glue is not favorably accommodated in the groove, the integral thickness of the battery core is increased, and the energy density is not favorably improved; the thickness of the coating region is defined to prevent the coating region from being too thin, which makes it inconvenient to form a groove on the coating region, resulting in an increase in the overall production cost of the battery.
As an improvement of the battery cell pole piece of the present invention, the cross section of the groove is square or U-shaped. The cross section of the groove is square or U-shaped. The cross section of the groove can be designed to be square or U-shaped according to the shapes of the pole lugs and the second insulating glue and the design of the battery.
The invention also aims to provide an electric core, which comprises an isolating film, an anode sheet and a cathode sheet, wherein the anode sheet and the cathode sheet are formed by the electric core pole pieces, the isolating film is wound to form the electric core, a blank foil area of the anode sheet and a blank foil area of the cathode sheet are arranged in a staggered manner, a cathode lug is welded in the blank foil area of the anode sheet, a positive lug is welded in the blank foil area of the cathode sheet, a groove is arranged at the position of the anode sheet corresponding to the positive lug, and a groove is arranged at the position of the cathode sheet corresponding to the negative lug.
It should be noted that: the empty foil area of the anode sheet and the empty foil area of the cathode sheet are arranged in a staggered manner, so that the cathode tab and the anode tab are prevented from overlapping together, and the short circuit of the cathode tab and the anode tab is prevented, and the safety of the battery cell is improved; because the cathode sheet is an electrode for generating a reduction reaction, and the anode sheet is an electrode for generating an oxidation reaction, the anode tab is welded on the cathode sheet, and the cathode tab is welded on the anode sheet; the position that the positive pole piece corresponds positive tab is provided with the recess, and the position that the negative pole piece corresponds the negative pole ear is provided with the recess, when the pole piece is convoluteed, has avoided the problem of the super-thick of the book core that leads to because of the thickness stack of insulated adhesive paper, wherein, is in the top surface and the bottom surface of pole piece in two recesses respectively, and when convoluteing, the outstanding step of first insulating cement can be accomodate by the recess by the step to reduce the influence of first insulating cement to electric core thickness, improved the volume energy density of battery.
As an improvement of the battery core, the anode sheet is coated with one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon carbon, lithium titanate, silicon-based composite material and tin-based composite material, and the cathode sheet is coated with one of lithium cobaltate, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminate, lithium manganate, lithium nickelate, lithium iron phosphate and lithium-rich manganese base.
The invention has the beneficial effects that the pole piece comprises a pole piece and a pole lug, the pole piece is provided with a coating area and a hollow foil area, the pole lug is accommodated in the hollow foil area, the pole lug is covered with a first insulating glue, the coating area is provided with a plurality of grooves matched with the first insulating glue at intervals, the first insulating glue is accommodated in the grooves, and the bottom surface of the grooves is provided with a second insulating glue. In the manufacturing process of the conventional lithium ion battery cell, in order to avoid the problem of potential safety hazard reduction caused by lithium precipitation in the charging process of a positive electrode and a negative electrode, auxiliary adhesive tapes are adhered to the positive electrode and the negative electrode to prevent the lithium ion from being embedded, the safety risk of lithium precipitation is avoided during charging, meanwhile, in order to protect a region with a thin coating, the region needs to be covered by the auxiliary adhesive tapes, the whole thickness of a winding core is increased at an adhesive position, in addition, the back of a pole piece after pole piece tab welding can generate a convex step or burr problem, the safety risk caused by the fact that the step pole burr pierces a diaphragm to cause contact short circuit of the positive electrode and the negative electrode is avoided, the basic design is that the adhesive paper covering welding position is increased again at a pole tab welding position to prevent the step or burr problem, the whole thickness of the pole piece after the adhesive tape is adhered is increased, a plurality of adhesive, therefore, the coating area is provided with a plurality of grooves matched with the first insulating glue at intervals, the first insulating glue is contained in the grooves, the first insulating glue is equivalent to be embedded into the coating area, namely the first insulating glue is equivalent to be embedded into the coating of the pole piece, the problem that a winding core is excessively thick due to the thickness superposition of insulating glue paper is avoided, and the energy density of the battery cell is effectively improved; in order to reduce the thickness of the winding core occupied by the tab, the tab is accommodated in the empty foil area, namely, the thickness of the tab is smaller than or equal to that of the pole piece coating, so that the problem of generation of a convex step or burr due to over-thick tab is avoided; after the groove is formed, the thickness of the coating area of the pole piece is reduced, namely the coating at the bottom of the groove is thinner, and the second insulating glue is used for protecting the area with the thinner coating, so that the second insulating glue is arranged on the bottom surface of the groove; the grooves can be omitted when the pole pieces are coated, a secondary removing mode can be adopted after the pole pieces are coated, a scraper process or a laser cleaning process is used, the thickness of the coating is reduced, active substances of the grooves corresponding to the first insulating glue are completely removed, or the thickness of the first insulating glue needing to be embedded is removed, the situation that the first insulating glue is embedded into the coating and does not exceed the surface of the adjacent coating is ensured, and the problem that the pole pieces are thick after being wound is solved. The invention solves the problem of over-thickness of the rubberizing position after winding the pole piece, is beneficial to reducing the overall thickness of the battery core and improving the energy density of the battery, thereby improving the quality of the battery.
Drawings
Fig. 1 is a schematic structural view of an anode sheet and a cathode sheet according to the present invention.
Fig. 2 is a schematic view of the anode sheet and the cathode sheet of the present invention after being wound.
Fig. 3 is an enlarged view of fig. 2 at a.
Fig. 4 is an enlarged view of fig. 2 at B.
Wherein: 1-a coating zone; 2-empty foil areas; 3-first insulating glue; 4-a groove; 5-second insulating glue; 6-anode strip; 7-cathode plate; 8-negative electrode tab; 9-positive tab.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", horizontal ", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The present invention will be described in further detail below with reference to the accompanying drawings, but the present invention is not limited thereto.
Example 1
As shown in fig. 1-4, an electric core pole piece comprises a pole piece and a pole lug, wherein the pole piece is provided with a coating area 1 and an empty foil area 2, the pole lug is accommodated in the empty foil area 2, the pole lug is covered with a first insulating glue 3, a plurality of grooves 4 matched with the first insulating glue 3 are arranged in the coating area 1 at intervals, the first insulating glue 3 is accommodated in the grooves 4, and a second insulating glue 5 is arranged on the bottom surface of each groove 4. In the manufacturing process of the conventional lithium ion battery cell, in order to avoid the problem of potential safety hazard reduction caused by lithium precipitation in the charging process of a positive electrode and a negative electrode, auxiliary adhesive tapes are adhered to the positive electrode and the negative electrode to prevent the lithium ion from being embedded, the safety risk of lithium precipitation is avoided during charging, meanwhile, in order to protect a region with a thin coating, the region needs to be covered by the auxiliary adhesive tapes, the whole thickness of a winding core is increased at an adhesive position, in addition, the back of a pole piece after pole piece tab welding can generate a convex step or burr problem, the safety risk caused by the fact that the step pole burr pierces a diaphragm to cause contact short circuit of the positive electrode and the negative electrode is avoided, the basic design is that the adhesive paper covering welding position is increased again at a pole tab welding position to prevent the step or burr problem, the whole thickness of the pole piece after the adhesive tape is adhered is increased, a plurality of adhesive, therefore, the coating area 1 is provided with a plurality of grooves 4 matched with the first insulating glue 3 at intervals, the first insulating glue 3 is accommodated in the grooves 4, the first insulating glue 3 is equivalent to be embedded into the coating area 1, namely the first insulating glue 3 is equivalent to be embedded into a coating of a pole piece, the problem of over-thickness of a winding core caused by thickness superposition of insulating glue paper is avoided, and the energy density of the battery cell is effectively improved; in order to reduce the thickness of the winding core occupied by the tab, the tab is accommodated in the empty foil area 2, namely, the thickness of the tab is smaller than or equal to that of the pole piece coating, so that the problem of generation of a convex step or burr due to over-thick tab is avoided; after the groove 4 is formed, the thickness of the coating area 1 of the pole piece is reduced, namely the coating at the bottom of the groove 4 is thinner, and the second insulating glue 5 is used for protecting the area with the thinner coating, so that the second insulating glue 5 is arranged at the bottom surface of the groove 4; the grooves 4 can be omitted when the pole pieces are coated, a secondary removing mode can be adopted after coating, a scraper process or a laser cleaning process is used, the coating thickness is reduced, active substances of the grooves 4 corresponding to the first insulating glue 3 are completely removed, or the thickness of the first insulating glue 3 needing to be embedded is removed, the first insulating glue 3 is ensured not to exceed the surface of the adjacent coating after being embedded into the coating, and the problem that the pole pieces are thick after being wound is solved.
Preferably, two empty foil areas 2 are symmetrically arranged on two sides of the pole piece, wherein the areas of the empty foil area 2 on one side and the empty foil area 2 on the other side are equal. Empty 2 symmetries in foil district set up in the two sides of pole piece, not only be convenient for form utmost point ear put structure or many utmost point ear structure, still help welding utmost point ear on the pole piece, improve the steadiness between the two, reduce the influence of welding utmost point ear to electric core thickness, improved the volume energy density of battery, simultaneously, be convenient for get rid of the coating on utmost point ear surface through scraper technology or laser cleaning process, form the empty foil district 2 of positive and negative two sides, help reduction in production cost.
Preferably, two grooves 4 are arranged on two sides of the pole piece at intervals, and the two grooves 4 correspond to the first insulating glue 3 on two sides of the anode piece 6 or the first insulating glue 3 on two sides of the cathode piece 7 respectively. Because the pole piece comprises the anode piece 6 and the cathode piece 7, if the pole piece is the cathode piece 7, one groove 4 of the cathode piece 7 corresponds to the first insulating glue 3 on one surface of the anode piece 6, the other groove 4 of the cathode piece 7 corresponds to the first insulating glue 3 on the other surface of the anode piece 6, and the first insulating glue 3 is equivalently embedded into the groove 4, the problem of over-thickness of a winding core caused by the thickness superposition of insulating glue paper is avoided, and the energy density of the battery core is effectively improved; if the pole piece is anode strip 6, one of them recess 4 of anode strip 6 corresponds with the first insulating cement 3 of negative pole piece 7 one side, another recess 4 of anode strip 6 corresponds with the first insulating cement 3 of negative pole piece 7 another side, be equivalent to the recess 4 lid of anode strip 6 connect in the first insulating cement 3 of negative pole piece 7 one side, also include the first insulating cement 3 of the another side of negative pole piece 7, the problem of the core super-thickness that leads to because of the thickness stack of insulated paper has been avoided, for example, divide in the top surface and the bottom surface of anode strip 6 among two recesses 4, when convoluteing, the outstanding step of the first insulating cement 3 of negative pole piece 7 can be accomodate by recess 4 by the step, thereby reduce the influence of first insulating cement 3 to electric core thickness, the volume energy density of battery has been improved.
Preferably, the length of the first insulating paste 3 is greater than that of the second insulating paste 5; and/or the length of the first insulating paste 3 is smaller than the length of the second insulating paste 5. When the pole piece is positive pole piece 6, the length of first insulating glue 3 is less than the length of second insulating glue 5, when the pole piece is negative pole piece 7, the length of first insulating glue 3 is greater than the length of second insulating glue 5, but this embodiment does not use this as the limit, the length of first insulating glue 3 also can equal to the length of second insulating glue 5, it can to satisfy the length that is not greater than recess 4, first insulating glue 3 can avoid producing in the positive negative charging process and analyse lithium and reduce the potential safety hazard problem, so can paste first insulating glue 3 at pole piece itself and can prevent the embedding of lithium ion, and avoided when charging and analysed lithium safety risk.
Preferably, the height of the first insulating glue 3 and the second insulating glue 5 after superposition is equal to the depth of the groove 4. Highly equals the degree of depth of recess 4 after first insulating cement 3 and the 5 superpositions of second insulating cement, prevents that first insulating cement 3 and 5 superpositions of second insulating cement after, send the paper adhesive of the positive negative pole utmost point ear position of whole book core and superpose, cause utmost point ear thickness super-thick, cause the super-thick energy density of core thickness to reduce even.
Preferably, the distance from the bottom surface of the groove 4 to the current collector of the pole piece is less than or equal to the thickness of the coating zone 1. The distance less than or equal to of the mass flow body of pole piece of bottom surface of recess 4 coats the thickness of district 1, has avoided the problem of the core super-thick that leads to because of the thickness stack of insulated adhesive paper, effectively improves the energy density of electric core, ensures that recess 4 can the first insulating cement of holding 3 and second insulating cement 5, improves the quality of battery.
Preferably, the thickness of the first insulating glue 3 and the thickness of the second insulating glue 5 are both 10-20 μm, the thickness of the coating area 1 is greater than or equal to the thickness of the first insulating glue 3 and the thickness of the second insulating glue 5, and the thickness of the coating area 1 is at least 60 μm. The thicknesses of the first insulating glue 3 and the second insulating glue 5 are limited, so that the first insulating glue 3 and the second insulating glue 5 are prevented from being too thin, the mechanical performance is reduced, and the normal use of the battery cell is influenced; meanwhile, the first insulating glue 3 and the second insulating glue 5 are prevented from being too thick, so that the production cost of the battery is increased, the insulating glue is not favorably accommodated in the groove 4, the integral thickness of the battery core is increased, and the energy density is not favorably improved; the thickness of the coating region 1 is defined to prevent the coating region 1 from being too thin, and thus it is inconvenient to form the groove 4 on the coating region 1, resulting in an increase in the overall production cost of the battery.
Preferably, the cross-section of the groove 4 is square or U-shaped. The cross section of the groove 4 may be designed to be square or U-shaped according to the shapes of the tabs and the second insulating paste 5 and the design of the battery.
The working principle of the invention is as follows:
the coating area 1 is provided with a plurality of grooves 4 matched with the first insulating glue 3 at intervals, the first insulating glue 3 is contained in the grooves 4, the first insulating glue 3 is equivalent to be embedded into the coating area 1, namely the first insulating glue 3 is equivalent to be embedded into a coating of a pole piece, the problem that a winding core is excessively thick due to the thickness superposition of insulating glue paper is avoided, and the energy density of the battery cell is effectively improved; in order to reduce the thickness of the winding core occupied by the tab, the tab is accommodated in the empty foil area 2, namely, the thickness of the tab is smaller than or equal to that of the pole piece coating, so that the problem of generation of a convex step or burr due to over-thick tab is avoided; after the groove 4 is formed, the thickness of the coating area 1 of the pole piece is reduced, namely the coating at the bottom of the groove 4 is thinner, and the second insulating glue 5 is used for protecting the area with the thinner coating and improving the mechanical strength of the thinner area, so the second insulating glue 5 is arranged on the bottom surface of the groove 4; the grooves 4 can be omitted when the pole pieces are coated, a secondary removing mode can be adopted after coating, a scraper process or a laser cleaning process is used, the coating thickness is reduced, active substances of the grooves 4 corresponding to the first insulating glue 3 are completely removed, or the thickness of the first insulating glue 3 needing to be embedded is removed, the first insulating glue 3 is ensured not to exceed the surface of the adjacent coating after being embedded into the coating, and the problem that the pole pieces are thick after being wound is solved.
Example 2
As shown in fig. 1 to 4, an electric core includes an isolating film, and an anode sheet 6 and a cathode sheet 7 which are composed of the above-mentioned electric core pole pieces, the anode sheet 6 and the cathode sheet 7 are wound to form an electric core, the empty foil area 2 of the anode sheet 6 and the empty foil area 2 of the cathode sheet 7 are staggered, the empty foil area 2 of the anode sheet 6 is welded with a cathode tab 8, the empty foil area 2 of the cathode sheet 7 is welded with an anode tab 9, a groove 4 is arranged at a position of the anode sheet 6 corresponding to the anode tab 9, and a groove 4 is arranged at a position of the cathode sheet 7 corresponding to the cathode tab 8.
It should be noted that: the empty foil area 2 of the anode sheet 6 and the empty foil area 2 of the cathode sheet 7 are arranged in a staggered manner, so that the cathode tab 8 and the anode tab 9 are prevented from being overlapped together, the cathode tab 8 and the anode tab 9 are prevented from being short-circuited, and the safety of the battery core is improved; since the cathode sheet 7 is an electrode for generating a reduction reaction and the anode sheet 6 is an electrode for generating an oxidation reaction, the anode tab 9 is welded to the cathode sheet 7 and the cathode tab 8 is welded to the anode sheet 6; the position that positive plate 6 corresponds anodal ear 9 is provided with recess 4, the position that negative pole piece 7 corresponds negative pole ear 8 is provided with recess 4, when the pole piece is convoluteed, the problem of the core super-thick that rolls up that leads to because of the thickness stack of insulated adhesive paper has been avoided, wherein, divide in the top surface and the bottom surface of pole piece in two recesses 4, when convoluteing, the outstanding step of first insulating cement 3 can be accomodate by recess 4 by the step, thereby reduce the influence of first insulating cement 3 to electric core thickness, the volume energy density of battery has been improved.
Preferably, the anode sheet 6 is coated with one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon carbon, lithium titanate, a silicon-based composite material and a tin-based composite material, and the cathode sheet 7 is coated with one of lithium cobaltate, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminate, lithium manganese oxide, lithium nickel oxide, lithium iron phosphate and a lithium-rich manganese base. According to actual production and cost requirements, one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon carbon, lithium titanate, a silicon-based composite material and a tin-based composite material is coated on the anode sheet 6, and one of lithium cobaltate, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminate, lithium manganate, lithium nickelate, lithium iron phosphate and a lithium-rich manganese base is coated on the cathode sheet 7.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. A battery core pole piece is characterized in that: the pole piece is provided with a coating area (1) and a hollow foil area (2), the pole piece is accommodated in the hollow foil area (2), the pole piece is covered with first insulating glue (3), a plurality of grooves (4) matched with the first insulating glue (3) are formed in the coating area (1) at intervals, the first insulating glue (3) is accommodated in the grooves (4), and second insulating glue (5) is arranged on the bottom surface of each groove (4).
2. The cell pole piece of claim 1, wherein: the two empty foil areas (2) are symmetrically arranged on two sides of the pole piece, wherein the areas of the empty foil area (2) on one side and the area of the empty foil area (2) on the other side are equal.
3. The cell pole piece of claim 2, wherein: two recess (4) interval sets up the both sides of pole piece, two recess (4) respectively with anode strip (6) both sides first insulation is glued (3) or cathode strip (7) both sides first insulation glue (3) correspond.
4. The cell pole piece of claim 1, wherein: the length of the first insulating glue (3) is greater than that of the second insulating glue (5); and/or the length of the first insulating glue (3) is smaller than the length of the second insulating glue (5).
5. The cell pole piece of claim 1, wherein: the height of the first insulating glue (3) and the second insulating glue (5) after superposition is equal to the depth of the groove (4).
6. The cell pole piece of claim 1, wherein: the distance from the bottom surface of the groove (4) to the current collector of the pole piece is less than or equal to the thickness of the coating area (1).
7. The cell pole piece of claim 1, wherein: the thickness of the first insulating glue (3) and the thickness of the second insulating glue (5) are both 10-20 mu m, the thickness of the coating area (1) is larger than or equal to the thickness of the first insulating glue (3) and the thickness of the second insulating glue (5), and the thickness of the coating area (1) is at least 60 mu m.
8. The cell pole piece of claim 1, wherein: the cross section of the groove (4) is square or U-shaped.
9. An electric core, its characterized in that: the battery comprises an isolating film and an anode sheet (6) and a cathode sheet (7) which are formed by the battery core pole pieces as claimed in claims 1 to 8, wherein the anode sheet (6) and the cathode sheet (7) are wound to form a battery core, an empty foil area (2) of the anode sheet (6) and an empty foil area (2) of the cathode sheet (7) are arranged in a staggered mode, a negative lug (8) is welded in the empty foil area (2) of the anode sheet (6), a positive lug (9) is welded in the empty foil area (2) of the cathode sheet (7), the anode sheet (6) corresponds to the position of the positive lug (9) and is provided with a groove (4), and the cathode sheet (7) corresponds to the position of the negative lug (8) and is provided with a groove (4).
10. The electrical core of claim 9, wherein: the anode sheet (6) is coated with one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon carbon, lithium titanate, silicon-based composite material and tin-based composite material, and the cathode sheet (7) is coated with one of lithium cobaltate, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminate, lithium manganate, lithium nickelate, lithium iron phosphate and lithium-rich manganese base.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910953151.1A CN110729447A (en) | 2019-10-09 | 2019-10-09 | Battery cell pole piece and battery cell |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910953151.1A CN110729447A (en) | 2019-10-09 | 2019-10-09 | Battery cell pole piece and battery cell |
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| Publication Number | Publication Date |
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| CN110729447A true CN110729447A (en) | 2020-01-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910953151.1A Pending CN110729447A (en) | 2019-10-09 | 2019-10-09 | Battery cell pole piece and battery cell |
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