CN218039281U - Negative plate and battery - Google Patents
Negative plate and battery Download PDFInfo
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- CN218039281U CN218039281U CN202222450151.XU CN202222450151U CN218039281U CN 218039281 U CN218039281 U CN 218039281U CN 202222450151 U CN202222450151 U CN 202222450151U CN 218039281 U CN218039281 U CN 218039281U
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- negative electrode
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- active material
- material layer
- current collector
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The utility model provides a negative plate and a battery, wherein the negative plate comprises a negative current collector, a negative active material layer and a glue paste; the negative electrode current collector comprises a first side surface and a second side surface which are opposite, and at least one side surface of the first side surface and the second side surface is provided with the negative electrode active material layer; the adhesive sticker is provided with a through hole structure; the glue paste is arranged at one end, close to the center of the battery roll core, of one of the first side face and the second side face, and is used for filling a gap between the positive plate and one end, close to the center of the battery roll core, of the negative plate. The embodiment of the utility model provides an improve the roughness of battery at electric core inner circle, reduce the battery and because of the uneven inflation deformation that leads to of atress in the cyclic expansion process, also reduced because of the capacity decay and the battery inefficacy that the lithium leads to are separated out to the edge, and then promoted the result of use of battery.
Description
Technical Field
The utility model relates to the technical field of batteries, especially, relate to a negative pole piece and battery.
Background
The lithium ion battery is widely used in daily life of people, wherein the lithium ion battery has the characteristics of high specific energy, low self-discharge, long cycle life, no pollution to the environment and the like, and along with the rapid development of the lithium ion battery technology, people put forward higher requirements on the energy density, the quick charging capability and the charging and discharging multiplying power of the lithium ion battery.
In the prior art, the conventional winding type lithium ion battery structure cannot meet the requirement of quick charging, so the positions of the tabs need to be moved to the positions of 3/4, 1/3 or 1/2 and the like of the positive and negative pole pieces, the positive pole pieces need to be cut again in order to prevent lithium precipitation at the edges, the negative pole pieces cover the positive pole pieces, gaps exist in the positions of the winding cores, unevenness of inner rings of the battery cells is caused, and the using effect of the battery is poor.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a negative pole piece and battery to solve among the prior art battery because of the relatively poor problem of battery result of electric core inner circle unevenness leads to.
In order to achieve the above object, an embodiment of the present invention provides a negative plate, which includes a negative current collector, a negative active material layer, and a glue; the negative electrode current collector comprises a first side surface and a second side surface which are opposite, and at least one side surface of the first side surface and the second side surface is provided with the negative electrode active material layer; the adhesive sticker is provided with a through hole structure; the glue paste is arranged at one end, close to the center of the battery roll core, of one of the first side face and the second side face, and is used for filling a gap between the positive plate and one end, close to the center of the battery roll core, of the negative plate.
Optionally, in a case where the anode active material layer is disposed on the first side surface and the second side surface, a length of the anode active material layer in the first side surface along the extending direction of the anode current collector is larger than a length of the anode active material layer in the second side surface along the extending direction of the anode current collector;
the adhesive is arranged on one side of the first side surface, the length of the negative current collector is greater than that of the negative active material arranged on the first side surface, one part of the adhesive is fixed with the negative active material layer, and the other part of the adhesive is fixed with the negative current collector;
the glue paste is arranged on one side of the second side face, the length of the negative current collector is larger than that of the negative active material arranged on the first side face, and the glue paste is fixed with the negative current collector.
Optionally, in a case that the sticker is disposed on one side of the second side surface, and the length of the negative electrode current collector is greater than the length of the negative electrode active material layer disposed on the first side surface, the sticker is fixed to the negative electrode current collector, wherein the first end of the negative electrode active material layer is symmetric to the first side surface by taking the negative electrode current collector as a symmetry axis, and the position of the first side surface is located at the center of the first end of the sticker and the second end of the sticker;
the negative pole active material layer of first side is being close to the one end at the center of battery roll core does the first end of negative pole active material layer, the first end of gluing does glue and paste near the one end of the afterbody of negative pole mass flow body, the second end of gluing does glue and paste near the one end of negative pole active material layer.
Optionally, the adhesive is disposed on one side of the second side surface, and the length of the negative electrode current collector is greater than the length of the negative electrode active material layer disposed on the first side surface, and the adhesive is fixed to the negative electrode current collector, wherein a first end of the negative electrode active material layer is flush with a first end of the adhesive in a direction along which the negative electrode current collector extends;
the negative electrode active material layer of the first side is close to one end of the center of the battery roll core, the first end of the negative electrode active material layer is the first end of the adhesive tape, and the first end of the adhesive tape is close to one end of the tail of the negative electrode current collector.
Optionally, the adhesive is disposed on one side of the second side surface, and the length of the negative electrode current collector is greater than the length of the negative electrode active material layer disposed on the first side surface, and the adhesive is fixed to the negative electrode current collector, wherein a first end of the negative electrode active material layer is flush with a second end of the adhesive in a direction along which the negative electrode current collector extends;
the negative active material layer of first side is being close to the one end at battery roll core's center does the first end on negative active material layer, the second end of gluing does glue the one end that keeps away from the afterbody of negative current collector.
Optionally, the sticker includes an insulating layer and a glue layer.
Optionally, the thickness value of the glue layer is greater than or equal to 2 μm, and the thickness value of the glue layer is less than or equal to a first preset value;
the first preset value is more than or equal to half of the thickness value of the positive plate paste removing and is 10 mu m less, the first preset value is less than or equal to half of the thickness value of the positive plate paste removing and is 4 mu m less, and the positive plate paste removing is the part, which is absent from the negative plate, of one end, close to the center of the battery winding core, of the positive plate.
Optionally, the thickness value of the insulating layer is greater than or equal to 2 μm, and the thickness value of the insulating layer is less than or equal to a first preset value;
the first preset value is more than or equal to half of the thickness value of the positive plate paste removing and is 10 mu m less, the first preset value is less than or equal to half of the thickness value of the positive plate paste removing and is 4 mu m less, and the positive plate paste removing is the part, which is absent from the negative plate, of one end, close to the center of the battery winding core, of the positive plate.
Optionally, the thickness of the adhesive sticker is 0.52-0.55 times of the thickness of the positive plate.
Optionally, the length of the adhesive attached to the cathode plate in the extending direction is 1.8-2.2 times of the length of the anode plate de-paste, and the length of the anode plate de-paste is the end of the anode plate close to the center of the battery winding core, compared with the part of the cathode plate which is lacking.
The embodiment of the utility model provides a battery is still provided, the battery includes the negative pole piece.
In the embodiment of the utility model, because of in the correlation technique in order to prevent that the edge from separating lithium, so can tailor the positive plate, the negative plate after tailorring can cover the positive plate, as shown in fig. 1, thereby makes the battery roll up the core and leaves the gap in this position, leads to electric core inner circle unevenness, the utility model discloses an embodiment's negative plate is including gluing the subsides, glues the one end that sets up near the center of battery roll up in one side in first side and the second side, glues the gap that can fill up the one end that positive plate and negative plate are close to the center of battery roll up to glue the subsides and have the through-hole structure, be used for the transmission of lithium ion in the battery on the one hand, on the other hand has reduced and has glued the arch and the unevenness that lead to because of buckling; the flatness of the inner ring of the battery core is improved, the expansion deformation of the battery caused by uneven stress in the circulating expansion process is reduced, the capacity attenuation and the battery failure caused by lithium precipitation at the edge are reduced, and the using effect of the battery is improved.
It should be understood that the statements herein are not intended to identify key or critical features of any embodiment of the present invention, nor are they intended to limit the scope of the invention. Other features of the present invention will be readily apparent from the following specification.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic view showing a structure of a wound battery in the related art;
fig. 2 is one of schematic structural diagrams of a negative plate according to an embodiment of the present invention;
fig. 3 is a second schematic structural diagram of a negative electrode sheet according to an embodiment of the present invention;
fig. 4 is a third schematic structural diagram of a negative plate according to an embodiment of the present invention;
fig. 5 is a fourth schematic structural view of a negative electrode plate according to an embodiment of the present invention;
fig. 6 is a fifth schematic structural view of a negative plate according to an embodiment of the present invention;
fig. 7 is a sixth schematic structural view of a negative plate according to an embodiment of the present invention;
fig. 8 is a seventh schematic structural diagram of a negative electrode plate according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The terms "first," "second," and the like in the embodiments of the present invention are used for distinguishing similar objects, and do not necessarily have to be used for describing a particular order or sequence. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiment of the present invention provides a negative electrode sheet, as shown in fig. 2 to 8, the negative electrode sheet includes a negative electrode current collector 10, a negative electrode active material layer 20, and a sticker 30; the negative electrode current collector 10 includes first and second opposite side surfaces, at least one of which is provided with a negative electrode active material layer 20; the adhesive 30 has a through hole structure; the adhesive 30 is arranged at one end, close to the center of the battery roll core, of one of the first side face and the second side face, and the adhesive 30 is used for filling a gap between the positive plate and one end, close to the center of the battery roll core, of the negative plate.
In this embodiment, the above-mentioned negative pole piece is including negative pole mass flow body 10, negative pole active material layer 20 and glue subsides 30, glue subsides 30 and set up in one of them side of above-mentioned first side and above-mentioned second side, and be close to the one end at above-mentioned battery roll core center, glue subsides 30 can fill and level up the gap of positive plate and the one end that above-mentioned negative pole piece is close to the center of above-mentioned battery roll core, thereby improve the roughness of battery at electric core inner circle, reduce the battery because of the uneven dilatational strain that leads to of atress in the circulation inflation process, on the other hand, capacity decay and battery failure that lead to because of the lithium is educed to the edge have also been reduced, and then the result of use of battery has been promoted.
Wherein, glue 30 and can also be to have above-mentioned through-hole structure, through the setting of above-mentioned through-hole structure, can improve the battery after the coiling is handled, lithium ion's transmission in the battery, so glue 30 and pass through the setting of above-mentioned through-hole structure, reduced to a certain extent to battery internal reaction or the influence of process, on the other hand, if glue 30 under the condition that needs buckle, the setting of above-mentioned through-hole structure can reduce and glue 30 because of buckle the arch or the unevenness that leads to.
Referring to fig. 2 and 3, the position of the through hole structure disposed on the adhesive 30 may be determined according to the position of the adhesive 30 disposed on the negative electrode collector 10 or the negative electrode active material layer 20, in the case shown in fig. 2, the through hole structure is disposed on the left side of the adhesive 30 in the direction shown in fig. 2, and in the case shown in fig. 3, the through hole structure is disposed on the center of the adhesive 30 in the direction shown in fig. 2.
Need explain, above-mentioned through-hole structure can be according to the user's demand add the setting, and not setting up under the condition of above-mentioned through-hole structure at gluey subsides 30, still can improve the roughness of battery at electric core inner circle, reduce the battery because of the uneven inflation deformation that leads to of atress in the circulation inflation process, this the embodiment of the utility model discloses no longer describe repeatedly.
It should be understood that the adhesive 30 may be disposed on the first side surface or the second side surface, and after the adhesive 30 is disposed on both side surfaces of the negative electrode active material layer 20, the gap of the inner circle of the battery cell may be effectively filled by winding, so as to reduce the possibility of lithium deposition at the edge of the battery.
The adhesive 30 may be directly fixed to the negative electrode current collector 10, or a part of the adhesive 30 may be fixed to the negative electrode current collector 10 and another part of the adhesive 30 may be fixed to the negative electrode active material layer 20.
The method specifically comprises the following steps: if the adhesive 30 is disposed on one of the two side surfaces where the length of the negative active material layer 20 is longer along the extending direction of the negative current collector 10, a part of the adhesive 30 may be fixedly attached to the negative current collector 10, and the other part of the adhesive may be fixedly attached to the negative active material layer 20, and after the negative electrode sheet and the positive electrode are matched and wound, the adhesive 30 may improve the flatness of the battery at the inner ring of the battery cell.
If the adhesive 30 is disposed on one side of the two side surfaces where the length of the negative active material layer 20 is shorter along the extending direction of the negative current collector 10, the adhesive 30 may be completely attached to the negative current collector 10, and after the negative electrode sheet and the positive electrode are matched and wound, the adhesive 30 may still improve the flatness of the battery at the inner ring of the battery core.
It should be understood that the length and thickness of the sticker 30 can be set according to the structural size of the battery at the inner circle of the battery core, and also can be set according to the size of the positive plate withdrawing paste in the battery, the positive plate withdrawing paste is the one end of the positive plate close to the center of the battery roll core, and is compared with the part lacking in the negative plate, and the embodiment of the present invention is not limited thereto.
Alternatively, in the case where the anode active material layer 20 is provided on the first side and the second side, the length of the anode active material layer 20 in the first side in the extending direction of the anode current collector 10 is larger than the length of the anode active material layer 20 in the second side in the extending direction of the anode current collector 10;
in a case where the sticker 30 is disposed on one side of the first side surface, and the length of the negative electrode current collector 10 is longer than the length of the negative electrode active material layer 20 disposed on the first side surface, a part of the sticker 30 is fixed to the negative electrode active material layer 20, and another part of the sticker 30 is fixed to the negative electrode current collector 10;
the sticker 30 is disposed on one side of the second side surface, and the length of the negative electrode current collector 10 is greater than the length of the negative electrode active material layer 20 disposed on the first side surface, and the sticker 30 is fixed to the negative electrode current collector 10.
In this embodiment, negative active material layer 20 is in first side is greater than negative active material layer 20 along the ascending length in the direction of extension of negative current collector 10 under the prerequisite of the ascending length in the direction of extension of negative current collector 10 is followed to the second side, the setting mode and the position of gluing 30 change because negative active material layer 20 is different in the length of both sides, set up in the different both sides of negative current collector through gluing 30, the limitation that gluing 30 set up the position has been reduced, can satisfy the demand that improves electric core inner circle roughness simultaneously again, and then the result of use of battery has been improved.
It should be noted that, when the adhesive 30 is disposed on the first side, the adhesive 30 after the winding process is located outside the tail portion of the negative current collector 10, and when the adhesive 30 is disposed on the second side, the adhesive 30 after the winding process is located inside the tail portion of the negative current collector 10.
Optionally, referring to fig. 5, in a case that the adhesive 30 is disposed on one side of the second side surface, and the length of the negative electrode current collector 10 is greater than the length of the negative electrode active material layer 20 disposed on the first side surface, the adhesive 30 is fixed to the negative electrode current collector 10, wherein the first end of the negative electrode active material layer 20 is symmetric to the first side surface by taking the negative electrode current collector 10 as a symmetry axis, and the position of the first side surface is located at the center of the first end of the adhesive 30 and the second end of the adhesive 30;
the negative electrode active material layer 20 of first side is being close to the one end at the center of battery roll core does the first end of negative electrode active material layer 20 glues the one end that the first end of subsides 30 is the afterbody that pastes 30 and is close to negative electrode mass collector 10, glues the second end of pasting 30 and is gluing the one end that 30 is close to negative electrode active material layer 20 for pasting 30.
In this embodiment, the adhesive 30 is completely attached to the negative current collector 10, and the first end of the negative active material layer 20 uses the negative current collector 10 as an axis of symmetry, and the first side surface is located at the center of the first end of the adhesive 30 and the second end of the adhesive 30, by the arrangement of this structure, after winding the positive plate and the negative plate, the adhesive 30 can bend along with the negative current collector 10, and in this case, the adhesive 30 is located at the inner side of the tail of the negative current collector 10, and the adhesive 30 is in a double-layer shape, so as to effectively average the pressure borne by the positive plate, improve the flatness of the surface of the battery core, and reduce the expansion and deformation of the battery core caused by uneven stress in the battery core cyclic expansion process.
Alternatively, referring to fig. 6, in a case that the sticker 30 is disposed on one side of the second side surface, and the length of the negative electrode current collector 10 is greater than the length of the negative electrode active material layer 20 disposed on the first side surface, the sticker 30 is fixed to the negative electrode current collector 10, wherein the first end of the negative electrode active material layer 20 is flush with the first end of the sticker 30 in the extending direction of the negative electrode current collector 10;
the negative active material layer 20 of the first side surface is the first end of the negative active material layer 20 at the end close to the center of the battery roll core, and the first end of the adhesive 30 is the end of the adhesive 30 close to the tail of the negative current collector 10.
In this embodiment, glue the whole laminating of 30 and be fixed in on the negative current collector 10, and the first end of negative pole active material layer 20 flushes along negative current collector 10 extending direction with the first end of gluing 30, setting through this structure, make and coil the processing back to positive pole piece and above-mentioned negative pole piece, glue 30 and can play the effect of support to the negative current collector 10 after buckling, but glue 30 and can not buckle along with negative current collector 10, glue 30 whole and also can not produce deformation, glue 30 and be the individual layer form, the pressure that can average pole piece bear effectively, improve the roughness on electric core surface, thereby reduce electric core expansion deformation because of the uneven electric core that leads to of atress in the circulation expansion process.
Alternatively, referring to fig. 7, in a case that the sticker 30 is disposed on one side of the second side surface, and the length of the negative electrode current collector 10 is greater than the length of the negative electrode active material layer 20 disposed on the first side surface, the sticker 30 is fixed to the negative electrode current collector 10, wherein a first end of the negative electrode active material layer 20 is flush with a second end of the sticker 30 in the extending direction of the negative electrode current collector 10;
the negative electrode active material layer 20 of the first side is close to the first end of the negative electrode active material layer 20 at the end of the center of the battery winding core, and the second end of the adhesive 30 is close to the end of the negative electrode active material layer 20 at the adhesive 30.
In this embodiment, glue and paste 30 and all laminate and be fixed in on the negative current collector 10, and, the first end of negative pole active material layer 20 flushes in the negative current collector 10 extending direction with the second end of gluing 30, setting through this structure, make and coil the processing back to positive pole piece and above-mentioned negative pole piece, glue and paste 30 and set up in the afterbody of the negative current collector 10 that has carried out the processing of buckling, glue whole of pasting 30 and also can not produce deformation, glue and paste 30 and be the individual layer form, the pressure that can average pole piece bore effectively, improve the roughness on electric core surface, thereby reduce electric core inflation deformation because of the uneven electric core that leads to of atress in the circulation inflation process.
In the configuration shown in fig. 7, compared to fig. 6, the position of the paste applied to the battery winding core in fig. 7 may be the same as the position of the paste applied to the battery winding core in fig. 6, but the fixing surface of the paste is different in both cases, and the paste is finally fixed downward to the negative electrode collector in fig. 6 and upward to the negative electrode collector in the viewing angles of fig. 6 and 7 as an example, and the paste is finally fixed upward to the negative electrode collector in fig. 7.
Optionally, the sticker 30 includes an insulating layer and a glue layer.
In this embodiment, glue 30 and paste including two-layer structure, wherein, the one deck is above-mentioned insulating layer, and the other deck is above-mentioned glue film, and the setting of above-mentioned insulating layer can reduce to glue 30 to the influence of battery inner structure itself, and above-mentioned glue film can improve the stability that sets up of gluing 30, reduces to glue the possibility that 30 drops, through the setting of this structure for when gluing 30 and keeping fixed stability, also can reduce the influence to battery normal operating.
It should be noted that, the thickness of the insulating layer and the thickness of the glue layer may be set according to the thickness of the positive plate in the battery, and the lengths of the insulating layer and the glue layer in the length direction of the pole piece may be set according to the paste removal of the positive plate, which is not limited in the embodiment of the present invention.
In addition, the insulating layer may be an insulating material selected for use in a battery, for example: the polymer layer may be made of one or more selected insulating materials.
Likewise, the above-mentioned gel layer may also be a gel material selected for use in a battery, such as: rubber and silica gel, suitable colloid material can reduce the possibility that drops under battery internal environment to above-mentioned glue film can select a colloid material for use, also can select multiple colloid material to mix and make and obtain, to the material selection of above-mentioned insulating layer and above-mentioned glue film, the embodiment of the utility model provides a do not do the restriction.
Optionally, the thickness value of the glue layer is greater than or equal to 2 μm, and the thickness value of the glue layer is less than or equal to a first preset value;
the first preset value is more than or equal to half of the thickness value of the positive plate paste removing and is 10 mu m less, the first preset value is less than or equal to half of the thickness value of the positive plate paste removing and is 4 mu m less, and the positive plate paste removing is the part, which is absent from the negative plate, of one end, close to the center of the battery winding core, of the positive plate.
In this embodiment, in the manufacturing process of the above adhesive layer, it is necessary to set the thickness of the above adhesive layer between 2 μm and the above first preset value, for example: the thickness of the adhesive layer may be selected to be between 2 μm and half of the thickness of the positive electrode tab desizing paste minus 10 μm, alternatively, in another possible embodiment, the thickness of the adhesive layer may be selected to be between half of the thickness of the positive electrode tab desizing paste minus 10 μm and half of the thickness of the positive electrode tab desizing paste minus 4 μm, which is only an example and is not limited herein.
When the relationship between the thickness of the positive electrode sheet and the thickness of the adhesive layer is defined, the thickness of the insulating layer can be determined from the relationship between the thickness of the positive electrode sheet and the thickness of the adhesive layer, and it is not necessary to define and calculate the thickness of the insulating layer.
Optionally, the thickness value of the insulating layer is greater than or equal to 2 μm, and the thickness value of the insulating layer is less than or equal to a first preset value;
the first preset value is more than or equal to half of the thickness value of the positive plate paste removing minus 10 mu m, the first preset value is less than or equal to half of the thickness value of the positive plate paste removing minus 4 mu m, and the positive plate paste removing is the part, which is less than the negative plate, of one end, close to the center of the battery winding core, of the positive plate.
In this embodiment, in the manufacturing process of the insulating layer, it is necessary to set the thickness of the insulating layer between 2 μm and the first preset value, for example: the thickness of the insulating layer may be selected to be between 2 μm and half of the thickness of the positive electrode tab paste-removed minus 10 μm, and may be changed, and in another possible embodiment, the thickness of the insulating layer may be selected to be between half of the thickness of the positive electrode tab paste-removed minus 10 μm and the thickness of the positive electrode tab paste-removed minus 4 μm, which is only an example and is not limited herein.
When the relationship between the thickness of the positive electrode sheet and the thickness of the adhesive sheet 30 is limited, the thickness of the adhesive layer can be determined from the relationship between the thicknesses of the positive electrode sheet and the adhesive sheet and the thickness of the insulating layer, and it is not necessary to limit or calculate the thickness of the adhesive layer.
Optionally, the insulating layer comprises at least one of a polymer layer, a textured paper, and a glassine paper.
In this embodiment, the insulating layer is made of one or more of a polymer layer, beautiful pattern paper and glassine paper, and the polymer layer, beautiful pattern paper and glassine paper can be applied to electronic components, and have the characteristics of high temperature resistance, good chemical solvent resistance, high adhesion, softness, fitness, no residual adhesive after tearing, and the like, so that the requirements of the negative plate are met, the adhesive 30 is applicable to the internal structure of the battery, the flatness of the inner ring of the battery core is improved, and the use effect of the battery is improved.
Optionally, the polymer layer comprises at least one of polyethylene, polypropylene, polyethylene terephthalate, polyvinyl chloride, polyimide, and polyurethane.
Optionally, the glue layer comprises at least one of rubber, silicone, acrylate, and polyurethane.
Optionally, the thickness of the sticker 30 is 0.52-0.55 times of the thickness of the positive plate.
In this embodiment, the thickness of the paste 30 is equal to or less than 0.55 times the thickness of the positive electrode sheet, and the thickness of the paste 30 is equal to or more than 0.52 times the thickness of the positive electrode sheet, for example: the thickness of the adhesive 30 may be 0.53 times the thickness of the positive electrode plate, alternatively, in another possible embodiment, the thickness of the adhesive 30 may also be 0.55 times the thickness of the positive electrode plate, which is only an example and is not limited herein.
Optionally, the length of the adhesive 30 in the extending direction of the negative plate is 1.8-2.2 times of the length of the positive plate de-pasted, where the positive plate de-pasted is the end of the positive plate close to the center of the battery winding core, compared with the portion lacking from the negative plate.
In this embodiment, the length of the sticker 30 in the extending direction of the negative electrode sheet is greater than or equal to 1.8 times of the length of the positive electrode sheet for removing the paste, and the length of the sticker 30 in the extending direction of the negative electrode sheet is less than or equal to 2.2 times of the length of the positive electrode sheet for removing the paste, for example: the length of the adhesive 30 in the extending direction of the negative electrode plate may be 1.9 times the length of the paste removal of the positive electrode plate, alternatively, in another possible embodiment, the length of the adhesive 30 in the extending direction of the negative electrode plate may be 2.1 times the length of the paste removal of the positive electrode plate, which is only an example and is not limited herein.
In addition, the embodiment of the utility model provides a battery is still provided, including above-mentioned negative pole piece.
It should be noted that the battery may be applied to various electric devices, and the electric devices may be a notebook computer, a smart phone, a new energy automobile, and the like. The implementation manner of the embodiment of the battery is also suitable for the embodiment of the electronic device, and can achieve the same technical effect, which is not described herein again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a component of' 8230; \8230;" does not exclude the presence of another like element in a process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus of the embodiments of the present invention is not limited to performing functions in the order discussed, but may include performing functions in a substantially simultaneous manner or in a reverse order based on the functions involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.
The embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present invention.
Claims (11)
1. The negative plate is characterized by comprising a negative current collector, a negative active material layer and a glue paste;
the negative electrode current collector comprises a first side surface and a second side surface which are opposite, and at least one side surface of the first side surface and the second side surface is provided with the negative electrode active material layer;
the adhesive sticker is provided with a through hole structure;
the glue paste is arranged at one end, close to the center of the battery roll core, of one of the first side face and the second side face, and is used for filling a gap between the positive plate and one end, close to the center of the battery roll core, of the negative plate.
2. The negative electrode sheet according to claim 1, wherein a length of the negative electrode active material layer in the first side surface in the extending direction of the negative electrode current collector is larger than a length of the negative electrode active material layer in the second side surface in the extending direction of the negative electrode current collector with the first side surface and the second side surface provided with the negative electrode active material layer;
the adhesive is arranged on one side of the first side surface, the length of the negative current collector is greater than that of the negative active material arranged on the first side surface, one part of the adhesive is fixed with the negative active material layer, and the other part of the adhesive is fixed with the negative current collector;
the glue paste set up in under the condition of one side of second side, just the length of negative current collector be greater than set up in first side the length of negative active material layer, glue paste with the negative current collector is fixed.
3. The negative electrode sheet according to claim 2, wherein the adhesive is disposed on one side of the second side surface, and the length of the negative electrode current collector is greater than the length of the negative electrode active material layer disposed on the first side surface, and the adhesive is fixed to the negative electrode current collector, wherein the first end of the negative electrode active material layer is located at the center of the first end of the adhesive and the second end of the adhesive, and the first end of the negative electrode active material layer is symmetric to the first side surface about the negative electrode current collector;
the negative pole active material layer of first side is being close to the one end at the center of battery roll core does the first end on negative pole active material layer, the first end of gluing does glue and paste near the one end of the afterbody of the negative pole mass flow body, the second end of gluing does glue and paste near the one end on negative pole active material layer.
4. The negative electrode sheet according to claim 2, wherein in a case where the sticker is disposed on one side of the second side surface, and a length of the negative electrode current collector is greater than a length of the negative electrode active material layer disposed on the first side surface, the sticker is fixed to the negative electrode current collector, wherein a first end of the negative electrode active material layer is flush with a first end of the sticker in a direction along which the negative electrode current collector extends;
the negative electrode active material layer of the first side is close to one end of the center of the battery roll core, the first end of the negative electrode active material layer is the first end of the adhesive tape, and the first end of the adhesive tape is close to one end of the tail of the negative electrode current collector.
5. The negative electrode sheet according to claim 2, wherein in a case where the sticker is disposed on one side of the second side surface, and a length of the negative electrode current collector is greater than a length of the negative electrode active material layer disposed on the first side surface, the sticker is fixed to the negative electrode current collector, wherein a first end of the negative electrode active material layer is flush with a second end of the sticker in a direction along which the negative electrode current collector extends;
the negative active material layer of first side is being close to the one end at battery roll core's center does the first end on negative active material layer, the second end of gluing does glue the one end that keeps away from the afterbody of negative current collector.
6. The negative electrode sheet of claim 1, wherein the adhesive comprises an insulating layer and an adhesive layer.
7. The negative electrode sheet according to claim 6, wherein the thickness of the adhesive layer is greater than or equal to 2 μm and less than or equal to a first preset value;
the first preset value is more than or equal to half of the thickness value of the positive plate paste removing and is 10 mu m less, the first preset value is less than or equal to half of the thickness value of the positive plate paste removing and is 4 mu m less, and the positive plate paste removing is the part, which is absent from the negative plate, of one end, close to the center of the battery winding core, of the positive plate.
8. The negative electrode sheet according to claim 6, wherein the thickness of the insulating layer has a value equal to or greater than 2 μm and a value equal to or less than a first predetermined value;
the first preset value is more than or equal to half of the thickness value of the positive plate paste removing and is 10 mu m less, the first preset value is less than or equal to half of the thickness value of the positive plate paste removing and is 4 mu m less, and the positive plate paste removing is the part, which is absent from the negative plate, of one end, close to the center of the battery winding core, of the positive plate.
9. The negative electrode plate according to claim 1, wherein the thickness of the adhesive is 0.52-0.55 times of the thickness of the positive electrode plate.
10. The negative plate according to claim 1, wherein the length of the adhesive in the extending direction of the negative plate is 1.8-2.2 times of the de-pasting length of the positive plate, and the de-pasting length of the positive plate is the part of the positive plate close to the center of the battery winding core, which is less than that of the negative plate.
11. A battery comprising the negative electrode sheet according to any one of claims 1 to 10.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222450151.XU CN218039281U (en) | 2022-09-15 | 2022-09-15 | Negative plate and battery |
| PCT/CN2023/106640 WO2024055733A1 (en) | 2022-09-15 | 2023-07-10 | Jelly roll and battery |
| EP23825593.9A EP4369466A1 (en) | 2022-09-15 | 2023-07-10 | Jelly roll and battery |
| US18/400,357 US20240145757A1 (en) | 2022-09-15 | 2023-12-29 | Rolled core and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222450151.XU CN218039281U (en) | 2022-09-15 | 2022-09-15 | Negative plate and battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218039281U true CN218039281U (en) | 2022-12-13 |
Family
ID=84355532
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222450151.XU Active CN218039281U (en) | 2022-09-15 | 2022-09-15 | Negative plate and battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218039281U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024055733A1 (en) * | 2022-09-15 | 2024-03-21 | 珠海冠宇电池股份有限公司 | Jelly roll and battery |
-
2022
- 2022-09-15 CN CN202222450151.XU patent/CN218039281U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024055733A1 (en) * | 2022-09-15 | 2024-03-21 | 珠海冠宇电池股份有限公司 | Jelly roll and battery |
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