CN204905336U - Electrode pole piece and adopt electric core of this pole piece - Google Patents
Electrode pole piece and adopt electric core of this pole piece Download PDFInfo
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- CN204905336U CN204905336U CN201520467990.XU CN201520467990U CN204905336U CN 204905336 U CN204905336 U CN 204905336U CN 201520467990 U CN201520467990 U CN 201520467990U CN 204905336 U CN204905336 U CN 204905336U
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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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Abstract
The utility model relates to an energy storage device field especially relates to an electrode pole piece and adopt electric core of this pole piece, and the electrode pole piece including the mass flow body, active material layer and utmost point ear, still includes the trench, and the trench is seted up in the coating of the mass flow body has active material layer's region, and with the position one -to -one of the utmost point ear of positive pole and/or negative pole, the size of trench all is not less than utmost point ear that it corresponded and the connection zone's that distinguishes of coating corresponding size. The electricity core includes anodal pole piece and/or negative pole pole piece that barrier film and electrode pole piece constitute, and anodal pole piece, negative pole pole piece and barrier film constitute the electric core of coiling, and the trench quantity total on anodal pole piece and the negative pole pole piece be two, and the position one -to -one of two groove bit positions and the utmost point ear of positive pole and negative pole. The electric core that this application provided, the convex part of the regional institute of utmost point ear welding alright absorbed by the trench to reduce welding utmost point ear to the influence of electric core thickness, improved the volume energy density of battery.
Description
Technical field
The application relates to energy storage device field, particularly relates to a kind of electrode plates and adopts the battery core of this pole piece.
Background technology
In correlation technique, the battery core anode pole piece of lithium ion battery and cathode pole piece include collector, active material layer and lug, active material layer is coated on the surface of collector, and all leaves uncoated district at the two ends of the length direction of collector, and tab welding is in a uncoated district.
And due to the existence of lug, after therefore forming battery core by this technique winding, the thickest place of battery core namely soldering polar ear part usually, thus reduces the volume energy density of battery.
Utility model content
This application provides a kind of electrode plates and adopt the battery core of this pole piece, the battery core brought because of soldering polar ear can be reduced and thicken problem, improve the volume energy density of battery.
The first aspect of the application provides a kind of electrode plates, comprise collector, active material layer and lug, described active material layer is coated on the surface of described collector, and all leave uncoated district at the two ends of the length direction of described collector, described lug is arranged in a described uncoated district, also comprise slot, described slot is opened in described collector and is coated with in the region of described active material layer, and when described electrode plates winding forms battery core, the position one_to_one corresponding of the described lug of the position of described slot and positive pole and/or negative pole, described slot is the configuration that three bandings close openings at one side, comprise a broadside and two relative long limits, the size on described long limit and the size of described broadside are all not less than the corresponding size of the join domain in described lug corresponding to it and described uncoated district.
Preferably, the two sides of described slot is provided with insulating cement, described insulating cement at least with the outer side bonds on two described long limits of described slot, and cross over described slot along the bearing of trend of described broadside.
Preferably, described insulating cement covers described slot completely, and with two described long limits of described slot and the outside of a described broadside all bonding.
Preferably, the both side surface of described collector is coated with described active material layer, and the described active material layer being positioned at a side surface of described collector exists overlapping with the projection of described active material layer on described collector being positioned at described collector opposite side surface
Described slot is opened in this overlapping region, and described slot is in the region of the described active material layer of described collector both sides simultaneously.
Preferably, the both side surface of described collector is coated with described active material layer, and the described uncoated district being positioned at a side surface of described collector exists overlapping with the projection of described active material layer on described collector being positioned at described collector opposite side surface
Described slot is opened in this overlapping region, and described slot is in the region of the described collector wherein described active material layer of side, and is in the described uncoated district of described collector opposite side.
The second aspect of the application provides a kind of battery core, the anode pole piece comprising barrier film and be made up of above-mentioned electrode plates and/or cathode pole piece, described anode pole piece, described cathode pole piece and described barrier film form winding battery core, described slot quantity summation on described anode pole piece and described cathode pole piece is two, and the position one_to_one corresponding of the described lug of the position of two described slots and positive pole and negative pole.
Preferably, two described slots are all arranged on described anode pole piece.
Preferably, slot described at least one is arranged on described cathode pole piece, and described active material layer is not exposed across the region that barrier film described in one deck is relative in the described slot described anode pole piece is arranged on this on described cathode pole piece.
Preferably, the described slot described anode pole piece is arranged on this on described cathode pole piece does not apply described active material layer across the region that barrier film described in one deck is relative.
Preferably, described anode pole piece being arranged on described slot on described cathode pole piece with this across the outer side covers of the described active material layer in the relative region of barrier film described in one deck has shielding layer.
The technical scheme that the application provides can reach following beneficial effect:
The battery core that the application provides owing to being provided with the slot corresponding with lug on electrode plates, and the part that tab welding region is protruded just can be absorbed by slot, thus reduce soldering polar ear to the impact of battery core thickness, improves the volume energy density of battery.
Should be understood that, it is only exemplary that above general description and details hereinafter describe, and can not limit the application.
Accompanying drawing explanation
The structure intention of the electrode plates that Fig. 1 provides for the embodiment of the present application;
Fig. 2 is for slot that the embodiment of the present application provides being located at the core strueture intention of anode pole piece;
Fig. 3 is for slot that the embodiment of the present application provides being located at the core strueture intention of cathode pole piece;
The core strueture intention of the comparative example 1 that Fig. 4 provides for the embodiment of the present application;
The structure intention of the electrode plates of the comparative example 2 that Fig. 5 provides for the embodiment of the present application;
The core strueture intention of the comparative example 2 that Fig. 6 provides for the embodiment of the present application.
Accompanying drawing illustrates:
1-electrode plates; 10-collector; The uncoated district of 100-; 12-active material layer; 14-lug; 16-slot; 18-insulating cement;
2-barrier film.
Accompanying drawing to be herein merged in specification and to form the part of this specification, shows the embodiment meeting the application, and is used from specification one principle explaining the application.
Embodiment
Also by reference to the accompanying drawings the application is described in further detail below by specific embodiment."front", "rear" described in literary composition, "left", "right", " on ", D score is all with the electrode plates in accompanying drawing and adopt the laying state of battery core of this pole piece for reference.
As shown in Figure 1, the embodiment of the present application one provides a kind of electrode plates 1, comprises collector 10, active material layer 12, lug 14, slot 16 and insulating cement 18.Active material layer 12 is coated in the surface of collector 10, and the both side surface major part region of collector 10 all applies active material layer 12, and all reserves uncoated district 100 at the two ends of the length direction of collector 10.
When reeling formation battery core, due to polarity and the method for winding difference of electrode plates 1, the factor impacts such as the active material layer 12 present position difference of collector 10 both sides, the projection major part of active material layer 12 on collector 10 of collector 10 both sides is overlapping, but in the position near two ends, the original position of the active material layer 12 of both sides and final position then may be different, and this just may make the uncoated district 100 being positioned at collector 10 side exist overlapping with the projection of coating zone on collector 10 of the active material layer 12 being positioned at collector 10 opposite side.
Slot 16 is opened in collector 10 and is coated with in the region of active material layer 12, and, when electrode plates 1 reel form battery core time, the position of slot 16 will with the position one_to_one corresponding of the lug 14 of negative or positive electrode.Lug 14 generally makes its part be fixedly connected with one of them uncoated district 100 by the mode of welding.And slot 16 is the configuration that three bandings close openings at one side, comprise a broadside 160 and two relative long limits 162, the size on long limit 162 and the size of broadside 160 are all not less than the corresponding size of the lug 14 corresponding to it and the join domain in uncoated district 100.
Wherein, offering position and can being in the region of the active material layer 12 of collector 10 both sides simultaneously of slot 16, is namely opened in both sides active material layer 12 and projects in overlapping region.But compared with the mode that this mode offering slot 16 and correlation technique do not offer slot 16, because slot 16 is opened in overlapping region, the coated area of the active material layer 12 of electrode plates 1 both sides can be caused to reduce simultaneously, larger on the total amount impact of the active material of battery core.
In the present embodiment, the offering position and also can be in the active material layer 12 of the collector 10 side region overlapping with the uncoated district 100 of opposite side of slot 16, such slot 16 offer the active material layer 12 that only can have influence on side, therefore less on the impact of the total amount of the active material of battery core.
Can, first according to the coating on both sides active material layer 12 of general fashion at collector 10, carry out die-cut by die cutting technique in corresponding position afterwards man-hour adding, active material layer 12 and collector 10 together be cut and forms slot 16.
Behind the slot 16 of die-cut formation, the intensity of electrode plates 1 at this place can be caused to reduce, be formed at winding in the process of battery core and easily cause electrode plates 1 to rupture.As shown in Figure 1, there is fracture time in the present embodiment in order to prevent electrode plates 1 from reeling, being all bonded with insulating cement 18 in the both sides of slot 16 and carrying out structural strengthening.Insulating cement 18 (such as green glue etc.) crosses over slot 16 along the bearing of trend of broadside 160, and with the outer side bonds on two long limits 162.Such insulating cement 18 can provide stronger pulling force, prevents electrode plates from being ruptured by slot 16.
After electrode plates 1 being offered slot 16, pole piece not only can be caused easily to rupture, the edge, slot 16 exposed also may cause battery short circuit or analyse lithium.Therefore, in more preferred mode, preferably adopt insulating cement 18 to cover slot 16 completely, insulating cement 18 and two long limits 162 of slot 16 and the outside of a broadside 160 all bonding.Such slot 16 just can be completely closed by the insulating cement 18 of both sides, reduces battery core short circuit and analyse the risk of lithium.
Insulating cement 18 accounts for about 5% of insulating cement 18 respective width or length substantially with the bonding size in the broadside 160 of slot 16 and the outside on long limit 162, bonding firm to ensure.
As shown in Figures 2 and 3, the embodiment of the present application two provides a kind of battery core, comprises electrode plates 1 and barrier film 2 that embodiment one provides.Wherein, the electrode plates 1 that embodiment one provides can as the anode pole piece of battery core, also can as the cathode pole piece of battery core, or the electrode plates 1 that the positive pole of battery core and cathode pole piece adopt the embodiment of the present application to provide, anode pole piece, cathode pole piece and barrier film 2 forms winding battery core simultaneously.It should be noted that in no matter battery core the electrode plates 1 that have employed several embodiment one and provide, but the total quantity of slot 16 in battery core is two, and the position of two slots 16 will with the position one_to_one corresponding of the lug 14 of positive pole and negative pole.Two slots 16 can be in the same layer of battery core, also can be in the different layers of battery core.The part that the welding region of such lug 14 protrudes just can be absorbed by slot 16, thus reduces soldering polar ear 14 to the impact of battery core thickness, improves the volume energy density of battery.
In correlation technique, in order to improve the performance of battery core, the negative electrode active material quantity of battery core inside generally needs unnecessary positive active material quantity.In the present embodiment, slot 16 can be opened in (see Fig. 2) on anode pole piece, also can be opened in (see Fig. 3) on cathode pole piece, but when slot 16 is opened on cathode pole piece, the quantity of active material of negative pole can be made to reduce, because this reducing the serviceability of battery core.For this reason, in the present embodiment, the slot 16 that corresponding cathode pole piece is offered, anode pole piece carries out PROCESS FOR TREATMENT with this slot 16 across the region that one deck barrier film 2 is relative, makes this region not expose active material layer 12.So just, also reduce the quantity of positive active material, thus the serviceability of battery core can be promoted.On anode pole piece, the not exposed area of active material layer 12 is preferably not less than the area of the insulating cement 18 that the slot 16 on cathode pole piece covers.
Make the mode that respective regions on anode pole piece does not expose active material layer 12 have a variety of, such as, adopt the mode of laser or other mechanical cleaning to be removed by the active material in anode pole piece respective regions.Also insulating cement 18 grade can be adopted to be covered by the active material in anode pole piece respective regions, make the active material in this region can not participate in reaction.
But, process in any case, slot 16 is arranged on cathode pole piece and positive active material and negative electrode active material all can be caused simultaneously to reduce, greatly reduce the volume energy density of battery core.Therefore, being all arranged on anode pole piece two slots 16 is most preferred scheme.
The effect of the electrode plates that the application provides is verified below by specific experiment:
Experimental example 1
The rectangular cell adopting 354798 models (thickness of resultant battery is 3.5 millimeters, and width is 47 millimeters, and length is 98 millimeters, and Winding Layer is 10 layers) is example, and the lithium ion battery preparation process of this experimental example is as follows:
As shown in Figure 1, the preparation of anode pole piece: take NMP as solvent, the conductive agent graphite of binding agent PVDF, 3%wt of the positive active material cobalt of 95%wt% acid lithium, 2wt% is added in NMO in proportion, stirs into the positive active material that range of viscosities is 2500 ~ 8000pas.This positive active material is coated on plus plate current-collecting body aluminium foil and forms positive electrode active material layer, and form uncoated district at two ends.Through super-dry, cold pressing, obtaining compacted density is 4.15g/cc.Adopting the mode of cross cutting anode pole piece to be positioned at the electric core winding number of plies the 1st layer of region corresponding with positive pole ear carries out die-cut, makes the slot of corresponding positive pole.This slot is in the active material layer of both sides simultaneously, and slot is of a size of 25 (long limit size) * 11 (broadside size) millimeters, and sticks green glue; Then, region district corresponding for negative lug carries out die-cut by the same mode of cross cutting that adopts, and makes the slot of corresponding negative pole.This negative pole slot is of a size of 25*11 millimeter, and sticks green glue.Be welded on by positive pole ear in uncoated district, the width of positive pole ear is 6.0 millimeters, and thickness is 0.06 millimeter, and length is 40.0mm.
The preparation of cathode pole piece: take deionized water as solvent, the negative electrode active material graphite of 95wt%, the conductive agent graphite of binding agent SBR, 2wt% of 2wt% and the thickener CMC of 1wt% are added in deionized water, stirs into the negative electrode active material that range of viscosities is 1000 ~ 3500pas.This negative electrode active material is coated on above negative current collector Copper Foil, dry, cold pressing and obtain compacted density 1.65g/cc.This cathode pole piece does not do cross cutting process, negative lug is directly welded in uncoated district 100, and the width of negative lug is 6.0 millimeters, and thickness is 0.06 millimeter, and length is 40.0mm.
The barrier film thickness adopted is PP/PE/PP tri-layers of composite porous isolating membrane of 11 μm.
The LiPF of electrolyte to be concentration be 1mol/L
6solution.Solvent is the mixed solvent of EC, PC and DEC, and the ratio of three is 1:1:1.
The assembling of battery: by anode pole piece, after barrier film and cathode pole piece are wound into the core strueture shown in Fig. 2, forming model is the battery of 354798, through encapsulation, fluid injection, changes into, shaping obtained high-energy density secondary battery of bleeding.
Experimental example 2:
Be with experimental example 1 difference:
Positive pole slot and negative pole slot are all positioned at the electric core winding number of plies the 8th layer.
Experimental example 3:
Be with experimental example 1 difference:
Positive pole slot and negative pole slot are all positioned at the electric core winding number of plies the 10th layer (outermost layer), and positive pole slot and negative pole slot are in the coating zone of active material layer of inner side and the region of the uncoated area overlapping in outside.
Experimental example 4:
Be with experimental example 1 difference:
The long limit of positive pole slot and negative pole slot is of a size of 15 millimeters, and the width of positive pole and negative lug is 6.0 millimeters, and thickness is 0.06 millimeter, and length is 30mm.
Experimental example 5:
Be with experimental example 1 difference:
The long limit of positive pole slot and negative pole slot is of a size of 10 millimeters, and the width of positive pole and negative lug is 6.0 millimeters, and thickness is 0.06 millimeter, and length is 25mm.
Experimental example 6:
Be with experimental example 1 difference:
The broadside of positive pole slot and negative pole slot is of a size of 9 millimeters.
Experimental example 7:
Be with experimental example 1 difference:
The broadside of positive pole slot and negative pole slot is of a size of 7 millimeters.
Comparative example 1:
Be with experimental example 1 difference:
Cross cutting process is not carried out to anode pole piece, namely do not prepare the slot 16 of positive pole and negative pole, and complete winding according to Fig. 4.
Comparative example 2:
Be with experimental example 1 difference:
Cross cutting process is not carried out to anode pole piece, according to the technical scheme that the patent No. 201420030319.4 provides, the mode of laser or other mechanical cleaning is adopted to be removed by the active material in certain area on anode pole piece and cathode pole piece, in the region vacated after adopting laser welding to remove active material on respective pole piece the lug 14 of positive pole and negative pole (see Fig. 5) paste insulating cement 18 in the weld both sides of lug 14, and, no longer be preserved for the uncoated district of connecting tab 14 in battery core center when reeling and forming battery core, core strueture as shown in Figure 6.
Performance comparision is carried out to experimental example 1 to 7 and comparative example 1 and 2.The results are shown in following table:
Comparative experiments example 1 and comparative example 1, the core strueture corresponding to experimental example 1, improves battery and effectively utilizes space, thus the energy density of battery gets a promotion.
Comparing embodiment 1 and comparative example 2, after 200cls, the core strueture corresponding to experimental example 1 can improve the problem on deformation in circulating battery process.
Comparative experiments example 1 and experimental example 3, slot 16 is in compared with uncoated district 100 and the structure in the region of active material layer 12 overlap be in the structure in the region of both sides active material layer 12 overlap with slot 16, and the energy density of battery can obtain higher.
Comparative experiments example 1,4,5,6,7, is optimized the size of slot 16, and the size of slot 16 is less, then the energy density of battery is higher.
The foregoing is only the preferred embodiment of the application, be not limited to the application, for a person skilled in the art, the application can have various modifications and variations.Within all spirit in the application and principle, any amendment done, equivalent replacement, improvement etc., within the protection range that all should be included in the application.
Claims (10)
1. an electrode plates, comprise collector, active material layer and lug, described active material layer is coated on the surface of described collector, and all leave uncoated district at the two ends of the length direction of described collector, described lug is arranged in a described uncoated district, it is characterized in that, also comprise slot
Described slot is opened in described collector and is coated with in the region of described active material layer, and when described electrode plates winding forms battery core, the position one_to_one corresponding of the described lug of the position of described slot and positive pole and/or negative pole,
Described slot is the configuration that three bandings close openings at one side, comprises a broadside and two relative long limits, and the size on described long limit and the size of described broadside are all not less than the corresponding size of the join domain in described lug corresponding to it and described uncoated district.
2. electrode plates according to claim 1, is characterized in that, the two sides of described slot is provided with insulating cement, described insulating cement at least with the outer side bonds on two described long limits of described slot, and cross over described slot along the bearing of trend of described broadside.
3. electrode plates according to claim 1, is characterized in that, described insulating cement covers described slot completely, and with two described long limits of described slot and the outside of a described broadside all bonding.
4. electrode plates according to claim 1, it is characterized in that, the both side surface of described collector is coated with described active material layer, and the described active material layer being positioned at a side surface of described collector exists overlapping with the projection of described active material layer on described collector being positioned at described collector opposite side surface
Described slot is opened in this overlapping region, and described slot is in the region of the described active material layer of described collector both sides simultaneously.
5. electrode plates according to claim 1, it is characterized in that, the both side surface of described collector is coated with described active material layer, and the described uncoated district being positioned at a side surface of described collector exists overlapping with the projection of described active material layer on described collector being positioned at described collector opposite side surface
Described slot is opened in this overlapping region, and described slot is in the region of the described collector wherein described active material layer of side, and is in the described uncoated district of described collector opposite side.
6. a battery core, it is characterized in that, the anode pole piece comprising barrier film and be made up of the electrode plates described in any one of claim 1 to 5 and/or cathode pole piece, described anode pole piece, described cathode pole piece and described barrier film form winding battery core, described slot quantity summation on described anode pole piece and described cathode pole piece is two, and the position one_to_one corresponding of the described lug of the position of two described slots and positive pole and negative pole.
7. battery core according to claim 6, is characterized in that, two described slots are all arranged on described anode pole piece.
8. battery core according to claim 6, it is characterized in that, slot described at least one is arranged on described cathode pole piece, and described active material layer is not exposed across the region that barrier film described in one deck is relative in the described slot described anode pole piece is arranged on this on described cathode pole piece.
9. battery core according to claim 8, is characterized in that, the described slot described anode pole piece is arranged on this on described cathode pole piece does not apply described active material layer across the region that barrier film described in one deck is relative.
10. battery core according to claim 8, is characterized in that, described anode pole piece being arranged on described slot on described cathode pole piece across the outer side covers of the described active material layer in the relative region of barrier film described in one deck with this has shielding layer.
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CN114766066A (en) * | 2021-03-17 | 2022-07-19 | 宁德新能源科技有限公司 | Pole piece and preparation method thereof, battery and electronic device |
WO2022257746A1 (en) * | 2021-06-09 | 2022-12-15 | 珠海冠宇电池股份有限公司 | Lithium-ion battery |
CN113381058B (en) * | 2021-06-09 | 2023-10-31 | 珠海冠宇电池股份有限公司 | Lithium ion battery |
CN113381058A (en) * | 2021-06-09 | 2021-09-10 | 珠海冠宇电池股份有限公司 | Lithium ion battery |
CN113948671A (en) * | 2021-09-02 | 2022-01-18 | 惠州锂威新能源科技有限公司 | Preparation method of positive pole piece, positive pole piece and secondary battery |
WO2023088430A1 (en) * | 2021-11-18 | 2023-05-25 | 珠海冠宇电池股份有限公司 | Electrode assembly and battery |
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