CN210926138U - Battery cell pole piece - Google Patents
Battery cell pole piece Download PDFInfo
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- CN210926138U CN210926138U CN201921675878.XU CN201921675878U CN210926138U CN 210926138 U CN210926138 U CN 210926138U CN 201921675878 U CN201921675878 U CN 201921675878U CN 210926138 U CN210926138 U CN 210926138U
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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
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Abstract
The utility model belongs to the technical field of battery production, concretely relates to electric core pole piece, including 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 and is stamped the first insulation and glues, the interval of coating be provided with a plurality of with first insulation glues complex recess, the first insulation glue holding in the recess, the bottom surface of recess is provided with the second insulation and glues. The utility model provides a pole piece coiling back rubberizing position super thick problem, help reducing the whole thickness of electric core, improve the energy density of battery to improve the quality of battery.
Description
Technical Field
The utility model belongs to the technical field of battery production, concretely relates to electric core pole piece.
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.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: 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 above purpose, the utility model 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 electric core pole piece, two empty paper tinsel district symmetry set up in the two sides of pole piece, wherein one side empty paper tinsel district and another side the area in empty paper tinsel district equals. 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 an electric core pole piece, two the recess interval sets up the two sides of pole piece, two the recess respectively with the positive pole piece two the first insulation glue or negative pole piece two the first insulation glue corresponds. 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 of the present invention, the length of the first insulating glue is greater than the length 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 electric core pole piece, first insulating glue with height after the second insulating glue stack equals the degree of depth of recess. 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 a battery core pole piece, the bottom surface of recess arrives the distance of the mass flow body of pole piece is less than or equal to the thickness in coating district. 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 a battery core pole piece, first insulating glue with the thickness of second insulating glue is 10-20 μm, the thickness in coating district is more than or equal to first insulating glue with the thickness of second insulating glue, the thickness in coating district is 60 μm at least. 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 cell pole piece, 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.
As an improvement of an electricity core pole piece, the pole piece includes positive pole piece and negative pole piece, the positive pole piece the negative pole piece is utmost point the barrier film is rolled up and is formed electric core, the empty paper tinsel district of positive pole piece with the setting of staggering in the empty paper tinsel district of negative pole piece, the empty paper tinsel district welding of positive pole piece has the negative pole ear, the empty paper tinsel district welding of negative pole piece has positive pole ear, the positive pole piece corresponds the position of positive pole ear is provided with the recess, the negative pole piece corresponds the position of negative pole ear is provided with the recess. 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 electric core pole piece, the anode plate coating has one in artificial graphite, natural graphite, soft carbon, hard carbon, silicon carbon, lithium titanate, silicon-based composite material and the tin-based composite material, the cathode plate coating has one in lithium cobaltate, nickel cobalt lithium manganate, nickel cobalt lithium aluminate, lithium manganate, lithium nickelate, lithium iron phosphate and rich lithium manganese base.
The beneficial effects of the utility model reside in that, the utility model discloses a 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 and is stamped first insulation and glues, the interval of coating is provided with a plurality of with first insulation glues complex recess, first insulation glue holding in the recess, the bottom surface of recess is provided with the second insulation and glues. 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 utility model provides a pole piece coiling back rubberizing position super thick problem, help reducing the whole thickness of electric core, improve the energy density of battery to improve the quality of battery.
Drawings
Fig. 1 is a schematic structural diagram of an anode sheet and a cathode sheet according to the present invention.
Fig. 2 is a schematic structural diagram 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 the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, 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 include, for example, fixed connections, detachable connections, 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 meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The present invention will be described in further detail with reference to the accompanying drawings, which are not intended to limit the present invention.
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 utility model discloses a theory of operation is:
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.
In addition, the battery cell using the electrode plates comprises an isolating film, an anode plate 6 and a cathode plate 7 which are formed by the electrode plates of the battery cell, wherein the anode plate 6 and the cathode plate 7 are wound to form the battery cell, the empty foil area 2 of the anode plate 6 and the empty foil area 2 of the cathode plate 7 are arranged in a staggered mode, the empty foil area 2 of the anode plate 6 is welded with a cathode lug 8, the empty foil area 2 of the cathode plate 7 is welded with an anode lug 9, a groove 4 is formed in the position, corresponding to the anode lug 9, of the anode plate 6, and a groove 4 is formed in the position, corresponding to the cathode lug 8, of the cathode plate 7.
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 become apparent to those skilled in the art from the disclosure and teachings of the above description. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious modifications, replacements or variations made by those skilled in the art on the basis of the present invention belong to 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. The cell pole piece of claim 1, wherein: the pole piece includes positive pole piece (6) and negative pole piece (7), positive pole piece (6) negative pole piece (7) and barrier film form electric core through convoluteing, the empty foil district (2) of positive pole piece (6) with the setting of staggering in empty foil district (2) of negative pole piece (7), the empty foil district (2) welding of positive pole piece (6) has negative pole ear (8), the empty foil district (2) welding of negative pole piece (7) has positive pole ear (9), positive pole piece (6) correspond the position of positive pole ear (9) is provided with recess (4), negative pole piece (7) correspond the position of negative pole ear (8) is provided with recess (4).
10. The cell pole piece 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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| CN201921675878.XU CN210926138U (en) | 2019-10-09 | 2019-10-09 | Battery cell pole piece |
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| CN201921675878.XU CN210926138U (en) | 2019-10-09 | 2019-10-09 | Battery cell pole piece |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110729447A (en) * | 2019-10-09 | 2020-01-24 | 惠州锂威新能源科技有限公司 | Battery cell pole piece and battery cell |
| CN113381136A (en) * | 2021-07-19 | 2021-09-10 | 新余赣锋电子有限公司 | L-shaped tab for buckle type flexible package battery cell |
| WO2022042303A1 (en) * | 2020-08-31 | 2022-03-03 | 珠海冠宇电池股份有限公司 | Lithium ion cell |
| CN114447443A (en) * | 2022-02-11 | 2022-05-06 | 宁德新能源科技有限公司 | Electrochemical device, method for manufacturing electrochemical device, and electric device |
| CN114788035A (en) * | 2021-03-30 | 2022-07-22 | 宁德新能源科技有限公司 | Electrode assembly, battery and electric device |
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2019
- 2019-10-09 CN CN201921675878.XU patent/CN210926138U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110729447A (en) * | 2019-10-09 | 2020-01-24 | 惠州锂威新能源科技有限公司 | Battery cell pole piece and battery cell |
| WO2022042303A1 (en) * | 2020-08-31 | 2022-03-03 | 珠海冠宇电池股份有限公司 | Lithium ion cell |
| CN114788035A (en) * | 2021-03-30 | 2022-07-22 | 宁德新能源科技有限公司 | Electrode assembly, battery and electric device |
| CN113381136A (en) * | 2021-07-19 | 2021-09-10 | 新余赣锋电子有限公司 | L-shaped tab for buckle type flexible package battery cell |
| CN114447443A (en) * | 2022-02-11 | 2022-05-06 | 宁德新能源科技有限公司 | Electrochemical device, method for manufacturing electrochemical device, and electric device |
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