CN212461733U - Current collector, negative pole piece and lithium ion battery - Google Patents
Current collector, negative pole piece and lithium ion battery Download PDFInfo
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- CN212461733U CN212461733U CN202021066902.2U CN202021066902U CN212461733U CN 212461733 U CN212461733 U CN 212461733U CN 202021066902 U CN202021066902 U CN 202021066902U CN 212461733 U CN212461733 U CN 212461733U
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The utility model belongs to the technical field of lithium ion, more specifically say, relate to a mass flow body, negative pole piece and lithium ion battery. The current collector is provided with two opposite surfaces, two side grooves are formed in each surface at intervals along a first direction, the side grooves extend along a second direction perpendicular to the first direction, and the side grooves are located between the two side grooves on the same surface to form a main body part of the current collector. Set up both sides limit groove at the mass flow body surface interval, when coating the dressing layer on the main part of the mass flow body, dressing thick liquids flow in to the side inslot of main part both sides, and at the inboard inslot formation obturator, so, the dressing thickness of dressing layer both sides border position department can be increased in the existence in side groove, avoid dressing layer both sides portion because of curtain coating or marginal effect the condition that thickness reduces gradually appears, avoid using the negative pole capacity reduction of the both sides edge of the negative pole piece that this mass flow body made, thereby can effectively reduce the lithium risk of separating of negative pole piece.
Description
Technical Field
The utility model belongs to the technical field of lithium ion battery, more specifically say, relate to a mass flow body, negative pole piece and lithium ion battery.
Background
In the use process of the lithium ion battery in the prior art, lithium precipitation is easy to occur at the edge of a negative pole piece, precipitated metal lithium can be oxidized into lithium ions, on one hand, the capacity of the battery is attenuated, and the energy density of the battery is reduced, on the other hand, the precipitated metal lithium forms lithium dendrites, and the dendrites can penetrate a diaphragm due to continuous growth, so that the battery is short-circuited, and irreversible influence is generated on the service life and safety of the lithium ion battery.
Generally, when active material slurry is coated on the surface of a current collector, because the slurry is a solid-liquid mixture with certain fluidity, the coated slurry can flow and extend towards the edge of the current collector and an edge casting area appears at the edge of the current collector, so that the coating thickness of the slurry at the edge of the current collector is smaller than the designed coating thickness, and the NP ratio (negative capacity per unit area/positive capacity per unit area) of the edge area of a positive pole piece and a negative pole piece after a battery core is wound is reduced, so that a greater lithium precipitation risk exists at the edge of the negative pole piece. Therefore, when the pole piece is manufactured, the width of the negative pole piece is designed to be slightly larger than the width of the positive pole piece, namely, the allowance size is reserved between the positive pole piece and the negative pole piece along the width direction, however, in order to ensure the normal winding of the battery cell, the width of the positive pole piece and the width of the negative pole piece are not different from each other too much, and the width size of the area thinned by casting at the edge of the negative pole piece is far larger than the allowance size which can be reserved between the positive pole piece and the negative pole piece when slurry is coated, so that the occurrence of lithium precipitation of the negative pole piece can not be effectively avoided.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the utility model is to provide a mass flow body, negative pole piece and lithium ion battery to lithium ion battery among the solution prior art easily takes place at negative pole piece edge and analyse the technical problem of lithium.
In order to achieve the above object, the utility model adopts the following technical scheme: the utility model provides a mass flow body, is suitable for but not only is limited to preparation lithium ion battery's negative pole piece, and the mass flow body has two relative surfaces, and both sides limit groove has been seted up along first direction interval on each surface, and the side groove extends along the second direction with first direction looks vertically, and lies in and constitutes the mass flow body between the both sides limit groove on same surface and be used for supplying the main part that the dressing is coated
Through adopting above-mentioned technical scheme, both sides limit groove is seted up at mass flow body surface interval, when coating the dressing layer on the main part of mass flow body, the dressing thick liquids flow in to the side inslot of main part both sides, and at the inboard inslot formation obturator of side, so, the dressing thickness of dressing layer both sides edge position department can be increased in the existence in side limit groove, the condition that thickness reduces gradually appears in the both sides edge that can avoid the dressing layer because of curtain coating or edge effect, avoid using the negative pole capacity reduction of the both sides edge of the negative pole piece that this mass flow body made, thereby effectively reduce this negative pole piece's the lithium risk of analysing.
Optionally, the lateral grooves have a rectangular cross section in the depth direction.
Through adopting above-mentioned technical scheme, side groove cell body shape rule, the cell body degree of depth remains unchanged along the curtain coating direction of dressing, during the coating thick liquids, the amount that the dressing flows into in the side groove along the curtain coating direction equals, do not flow into the side groove and cover the dressing in side groove top, reduce gradually along dressing curtain coating direction thickness, so, avoid appearing the arch that is higher than dressing layer design height in the top in side groove, avoid because of dressing layer's both sides edge thickness too big and lead to the pole piece of making edge bulge or the phenomenon that the fracture falls the powder appears.
Optionally, the depth of the side groove increases from one side close to the main body portion to the other side away from the main body portion.
Through adopting above-mentioned technical scheme, side groove cell body degree of depth increases from the opposite side that is close to the main part to keeping away from the main part, the cell body degree of depth increases along the casting direction of dressing, during coating thick liquids, the dressing flows into the volume of side inslot along the casting direction and increases gradually, so, can make the not side groove of flowing into and cover the dressing in side groove top and reduce along the popular direction thickness of dressing gradually, avoid appearing being higher than dressing layer design height's arch in the top in side groove, avoid because of dressing layer's both sides edge thickness too big and lead to the pole piece of making edge bulge or the phenomenon that the fracture falls the powder to appear.
Optionally, the bottom of the side groove is arc-shaped or inclined plane-shaped.
Through adopting above-mentioned technical scheme, ensure that the cell body degree of depth of side groove increases along the curtain coating direction of dressing gradually to effectively avoid appearing being higher than the arch of dressing layer design height in the top of side groove.
Optionally, the depth of the side groove is not more than 5 μm.
By adopting the technical scheme, after the dressing layer is coated, the thickness of the two side edges of the dressing layer is increased on the basis of normal coating, so that the increased thickness of the two side edges of the dressing layer due to the arrangement of the side edge grooves is ensured, and the reduced thickness value of the two side edges of the dressing layer due to casting or edge effect can be offset. Optionally, the width of the notch of the side groove is 0.5 mm-50 mm.
By adopting the technical scheme, the width of the two side edges of the coating layer formed by arranging the side grooves is ensured to be larger than or equal to the width of an area where the thickness of the coating layer on the traditional negative pole piece is gradually reduced due to casting or edge effect, so that the reduction of the negative pole capacity caused by casting or edge effect can be effectively counteracted by arranging the side grooves.
Optionally, the width of the notch of the side groove is 2mm to 15 mm.
By adopting the technical scheme, the width of the side groove can be ensured to prevent most of the negative pole pieces from lithium precipitation at the edge.
Optionally, each surface is further provided with two blank portions at intervals along the first direction, the blank portions extend along the second direction, and the side grooves on two sides of the same surface are respectively arranged between the corresponding main body portion and the corresponding blank portions.
Through adopting above-mentioned technical scheme, set up blank portion and avoid when the current collector surface coating dressing thick liquids to spill over, simultaneously, blank portion can also be used for placing utmost point ear.
The utility model provides an above-mentioned one or more technical scheme in the mass flow body have one of following technological effect at least: set up the side groove through two surfaces at the mass flow body, when coating the dressing layer on the main part of the mass flow body, dressing thick liquids flow in the side inslot of main part both sides, and form the obturator in the side inslot, so, the existence in side groove has increased the dressing thickness of dressing layer both sides border position department, the condition that thickness reduces gradually appears because of curtain coating or edge effect in the both sides edge of dressing layer has been avoided, thereby avoid using the negative pole capacity reduction of the both sides edge of the negative pole piece that this mass flow body made, guarantee that the regional positive negative pole NP ratio of pole piece border is close with the design ratio after coiling, effectively reduce the lithium risk of separating out of negative pole piece, promote the safety performance of the lithium ion battery who uses this mass flow body.
The utility model discloses another technical scheme is: the utility model provides a negative pole piece, includes foretell mass flow body and covers the dressing layer on the mass flow body surface, the dressing layer includes middle part layer and sets up in the marginal layer of the relative both sides portion in middle part layer along length direction, and middle part layer adaptation covers on the main part, and the bottom of marginal layer is filled in the side groove, and the top of marginal layer exposes the side groove outward.
The utility model discloses a negative pole piece, the middle part layer of its dressing layer corresponds the main part that covers the mass flow body, and the bottom of edge layer is filled in the side inslot, and the dressing thickness on edge layer can be increased in the existence in side groove, avoids the both sides edge of dressing layer to appear the condition that thickness reduces gradually because of curtain coating or edge effect to avoid the negative pole capacity of negative pole piece both sides edge to reduce, effectively reduce the lithium risk of analysing of negative pole piece, promote the lithium ion battery's that uses this negative pole piece security performance.
The utility model discloses another technical scheme is: a lithium ion battery is provided, which comprises the negative pole piece.
The utility model discloses a lithium ion battery, owing to used foretell negative pole piece, lithium ion battery takes place to analyse the risk greatly reduced of lithium, and battery safety can promote, and life is longer.
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 it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a front view of a current collector according to an embodiment of the present invention;
fig. 2 is a cross-sectional view (along the line a-a in fig. 1) of a current collector provided in the first embodiment;
fig. 3 is a cross-sectional view (along the line a-a in fig. 1) of a current collector provided in example two;
fig. 4 is a cross-sectional view (along the line a-a in fig. 1) of a current collector provided in the third embodiment;
fig. 5 is a cut-away view of a negative pole piece corresponding to the use of the current collector shown in fig. 2;
fig. 6 is a cut-away view of a negative pole piece corresponding to the use of the current collector shown in fig. 3;
fig. 7 is a cut-away view of a negative pole piece corresponding to the use of the current collector shown in fig. 4;
wherein, in the figures, the respective reference numerals:
10-a current collector; 11-side groove; 12-a body portion; 13-blank; 20-a dressing layer; 21-middle layer; 22-edge layer.
Detailed Description
In order to make the technical problem, technical scheme and beneficial effect that the utility model will solve more clearly understand, it is right to combine fig. 1 ~ 7 and embodiment below the utility model discloses further detailed description proceeds. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that the terms "length," "width," "upper," "lower," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.
As shown in fig. 1-4, an embodiment of the present invention provides a current collector 10, which is suitable for but not limited to making a negative electrode plate of a lithium ion battery, and specifically, the current collector 10 can be any one of a metal foil layer or a non-metal film layer with conductivity, such as a copper foil, an aluminum foil, a functional coating foil, a stainless steel foil, a nickel foil, and carbon paper.
In this embodiment, as shown in fig. 1, the current collector 10 has two opposite surfaces, each surface has two side grooves 11 spaced apart from each other along a first direction, the side grooves 11 extend along a second direction perpendicular to the first direction, and a main body of the current collector 10 for coating with a dressing is formed between the two side grooves 11 on the same surface. Specifically, in the present embodiment, as shown in fig. 1, the first direction is a direction indicated by an arrow F1 in the drawing, that is, a width direction of the current collector 10, and the second direction is a direction indicated by an arrow F2 in the drawing, that is, a length direction of the current collector 10, such that the side grooves 11 are opened at two opposite side portions of the surface of the current collector 10 in the width direction, and the side grooves 11 extend in the length direction and penetrate through two opposite end portions of the current collector 10, that is, the side grooves 11 extend from one end to the other end of the current collector 10. Further, when manufacturing the pole piece, it is necessary to coat the coating layers on the two opposite surfaces of the current collector 10 at the same time, so in this embodiment, the two opposite surfaces of the current collector 10 are both provided with the side grooves 11; and the sum of the width of the two side grooves 11 on the same surface and the width of the main body 12 is substantially equal to the width of the dressing layer covering the surface of the current collector 10, i.e. the dressing layer is correspondingly arranged above the main body 12 and the two side grooves 11.
In this embodiment, both sides limit groove 11 is seted up at the current collector 10 surface interval, when coating layer on the main part 12 of current collector 10, dressing thick liquids flow in to the side limit groove 11 of main part 12 both sides, and form the obturator in side limit groove 11, so, the dressing thickness of coating layer both sides edge position department can be increased in the existence of side limit groove 11, the condition that thickness reduces gradually can be avoided appearing because of curtain coating or edge effect in the both sides edge of coating layer, avoid using the negative pole capacity reduction of the both sides edge of the negative pole piece that this current collector 10 made, thereby effectively reduce this negative pole piece's the lithium risk of educing.
It should be noted that, in the conventional lithium ion battery production process, a pole piece is generally manufactured by a method of coating first and then cutting, that is, a dressing is coated on the substrate of the rolled current collector 10, and the substrate coated with the dressing is cut in sections after the dressing is coated, so as to manufacture a single pole piece. So, because the influence of casting or edge effect during coating thick liquids, edge casting area can all appear in substrate length direction's both sides edge and along width direction's both ends edge, and cut back length direction upward both sides casting edge area still can exist on solitary pole piece, and width direction upward both ends casting edge area can not appear on solitary pole piece owing to being cut, promptly to using the pole piece of coating earlier the back production technology production of cutting, it generally only can appear edge casting area in length direction's both sides, consequently, for this embodiment, through offering side groove 11 in current collector 10 length direction's both sides portion, can effectively solve the lithium problem of educing through the thickness that increases the dressing layer along length direction's relative both sides limit.
Particularly, for the production mode of coating the dressing after cutting, the edge casting area may appear at the position of the peripheral edge of the current collector 10 due to the influence of casting or edge effect, and at this time, the side groove 11 may be formed at the peripheral edge of the current collector 10 to increase the thickness of the peripheral side of the dressing layer.
In another embodiment of the present invention, as shown in fig. 1, the width of the notch of the side groove 11 is 0.5mm to 50mm, and the specific width of the notch is selected within the width range, so as to ensure the width of the two side edges of the coating layer formed by the side groove 11, and the width of the region where the thickness of the coating layer on the conventional negative electrode plate is gradually reduced due to the casting or the edge effect is greater than or equal to that of the coating layer on the conventional negative electrode plate, thereby ensuring that the negative electrode capacity reduction caused by the casting or the edge effect can be effectively offset by the setting of the side groove 11. In a specific embodiment, the width of the opening of the side groove 11 may be any value from 0.5mm to 50 mm.
Further, in this embodiment, the width of the notch of the side groove 11 is preferably 2mm to 15mm, and the notch of the side groove 11 in this width range is provided to ensure that the width of the side groove 11 can ensure that most of the negative electrode plate can not have the lithium precipitation phenomenon at the edge. Specifically, the width of the groove opening of the side groove 11 may be 2mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm, 13mm, 15mm, or the like.
In another embodiment of the present invention, as shown in fig. 1, the side groove 11 is an etching groove formed on the current collector 10 by etching, i.e. the side groove 11 can be formed by laser etching device, the forming process of the side groove 11 is simple, and is convenient for batch processing production.
In another embodiment of the present invention, as shown in fig. 1, each surface is further provided with two blank portions 13 along the first direction, i.e. the width direction of the current collector 10, the blank portions extend along the second direction and along the length direction of the current collector 10, and the two side grooves 11 located on the same surface are respectively disposed between the corresponding main portion 12 and the blank portions 13, specifically, after the side grooves 11 are opened on the current collector 10, the two opposite sides of the side grooves 11 correspond to the main portion 12 and the blank portions 13. The blank part 13 is arranged, so that slurry can be prevented from overflowing when the dressing is coated on the surface of the current collector 10, the capacity is prevented from being reduced due to slurry overflowing, and meanwhile, the blank part 13 can also be used for placing a lug.
In the embodiment of the present invention, as shown in fig. 2 to 4, the cross-sectional shape of the side groove 11 along the depth direction may be various, specifically:
the first embodiment is as follows:
as shown in fig. 2, the cross section of the side groove 11 in the depth direction is rectangular, the shape of the groove body of the side groove 11 is regular, the depth of the groove body is kept unchanged along the casting direction of the dressing, when the size is coated, the amount of the dressing flowing into the side groove 11 in the casting direction is equal, the dressing not flowing into the side groove 11 and covering the dressing above the side groove 11 is gradually reduced along the thickness of the casting direction of the dressing, thus, the bulge higher than the design height of the dressing layer is prevented from appearing above the side groove 11, and the phenomenon that the edge of the prepared pole piece is bulged or cracked and falls off due to the overlarge thickness of the edges of the two sides of the dressing layer is avoided.
Example two:
as shown in fig. 3, the bottom of the side groove 11 is arc-shaped, the depth of the side groove 11 gradually increases from one side close to the main body 12 to the other side far from the main body 12, the depth of the groove body gradually increases along the flowing direction of the dressing, and the amount of the dressing flowing into the side groove 11 along the flowing direction increases in a gradient manner when the dressing is coated with the slurry, so that the thickness of the dressing which does not flow into the side groove 11 and covers the side groove 11 is gradually reduced along the flowing direction of the dressing, a bulge higher than the design height of the dressing layer is avoided from occurring above the side groove 11, and the phenomenon that the edge of the manufactured pole piece bulges or cracks and falls off due to the excessive thickness of the two side edges of the dressing layer is avoided. In addition, as the depth of the side groove 11 gradually increases from the end close to the main body part 12 to the end far away from the main body part 12, the height variation trends of the upper surface and the lower surface of the corresponding dressing at the side groove 11 are consistent, namely the thicknesses are kept basically consistent, and the lithium precipitation risk is further reduced.
Example three:
as shown in fig. 4, the bottom of the side groove 11 is an inclined plane, and similarly to the embodiment, the depth of the side groove 11 gradually increases from one side close to the main body 12 to the other side far from the main body 12, so that the thickness of the dressing which does not flow into the side groove 11 and covers the side groove 11 gradually decreases along the fashion direction of the dressing, a protrusion higher than the design height of the dressing layer is prevented from appearing above the side groove 11, and the phenomenon that the edge of the manufactured pole piece bulges or cracks and falls off due to the excessive thickness of the two side edges of the dressing layer is avoided.
In the second and third embodiments, the junction between the side groove 11 and the main body 12 is gradually transited, i.e., the depth of the side groove 11 gradually increases from zero. After the dressing is coated, the thickness of the two opposite side parts of the dressing layer along the length direction is uniformly increased on the basis of normal coating, so that the thickness of the two side edges of the dressing layer increased by arranging the side edge grooves 11 is ensured, and the thickness value of the two side edges of the dressing layer reduced by casting or edge effect can be offset.
In the second and third embodiments, as shown in fig. 3 and 4, the depth of the side groove 11 near the main body 12 is not less than 0.05 μm, that is, a steep downgrade appears on the side of the side groove 11 near the main body 12, so that the dressing flowing into the side groove 11 is shaped to correspondingly form an upslope corresponding to the downgrade, so as to increase the connection strength between the dressing shaped in the side groove 11 and the groove wall of the side groove 11 and prevent the dressing in the side groove 11 from slipping out of the side groove 11 after being shaped.
In any of the above embodiments, the depth of the side grooves 11 is not greater than 5 μm, which not only ensures that the thickness of the two side edges of the dressing layer is increased on the basis of normal coating after the dressing is coated, ensures that the thickness of the two side edges of the dressing layer is increased due to the arrangement of the side grooves, can offset the thickness value of the side edges of the dressing layer reduced due to tape casting or edge effect, but also ensures that the two side grooves 11 are not communicated with each other when the two side grooves 11 are arranged on the two surfaces of the current collector 10 in an up-down opposite manner.
The embodiment of the utility model provides a negative pole piece still provides, as shown in fig. 5 ~ 7, this negative pole piece includes the mass flow body 10 of above-mentioned embodiment and covers in the dressing layer 20 on the mass flow body 10 surface, the upper surface and the lower surface of mass flow body 10 all cover dressing layer 20, dressing layer 20 includes middle part layer 21 and sets up in the marginal layer 22 of the relative both sides portion of middle part layer 21 along length direction, middle part layer 21 adaptation covers on main part 12, the bottom of marginal layer 22 is filled in side groove 11, side groove 11 is exposed outward at the top of marginal layer 22.
The negative pole piece of this embodiment, the middle part layer 21 of its dressing layer 20 corresponds the main part 12 that covers the mass flow body 10, the bottom of edge layer 22 is filled in side groove 11, the existence of side groove 11 can increase edge layer 21 dressing thickness, avoid the both sides edge of dressing layer 20 to appear the condition that thickness reduces gradually because of curtain coating or edge effect, thereby avoid the negative pole capacity reduction of negative pole piece both sides edge, effectively reduce the lithium risk of analyzing of negative pole piece, promote the lithium ion battery's that uses this negative pole piece security performance.
In a specific embodiment, the negative electrode plate can be manufactured by the following method:
as shown in fig. 4, a copper foil with a thickness of 9 μm is selected as a current collector 10, the upper surface and the lower surface of the copper foil are respectively etched by a laser etching device, side grooves 11 with a depth of 2 μm and a notch width of 10mm are respectively etched on both sides along the length direction, and the cross section of each side groove 11 along the depth direction is rectangular. Mixing artificial graphite, a conductive agent Super-P, a binder SBR and a thickening agent CMC in a weight ratio of 94: 3: 1.8: 1.2 filling the mixture in a deionized water solvent, stirring the mixture uniformly, sieving the mixture to obtain negative electrode slurry, coating the negative electrode slurry on the main body part 12 of the current collector 10 according to a conventional method, forming a middle layer 21 of a dressing layer 20 on the main body part 12, enabling the side dressing to flow into the side groove 11, and forming edge layers 22 at two sides of the main body part 12, wherein the bottoms of the edge layers are filled in the side groove 11, and the tops of the edge layers are exposed out of the side groove 11; and finally, baking, rolling and slitting to obtain the negative pole piece.
Or, as shown in fig. 5 and 6, a copper foil with a thickness of 9 μm is selected as the current collector 10, the upper surface and the lower surface of the copper foil are respectively etched by using a laser etching device, side grooves 11 with a maximum depth of 2 μm and a notch width of 10mm are respectively etched on both sides along the length direction, the bottom of each side groove 11 is arc-shaped or inclined plane-shaped, and the depth of each side groove 11 gradually increases from zero from one side close to the main body 12 to the other side far from the main body 12. Mixing artificial graphite, a conductive agent Super-P, a binder SBR and a thickening agent CMC in a weight ratio of 94: 3: 1.8: 1.2 filling the mixture in a deionized water solvent, stirring the mixture uniformly, sieving the mixture to obtain negative electrode slurry, coating the negative electrode slurry on the main body part 12 of the current collector 10 according to a conventional method, forming a middle layer 21 of a dressing layer 20 on the main body part 12, enabling the side dressing to flow into the side groove 11, and forming edge layers 22 at two sides of the main body part 12, wherein the bottoms of the edge layers are filled in the side groove 11, and the tops of the edge layers are exposed out of the side groove 11; and finally, baking, rolling and slitting to obtain the negative pole piece.
Another embodiment of the utility model provides a lithium ion battery (not shown), including foretell negative pole piece, this lithium ion battery, owing to used foretell negative pole piece, lithium ion battery takes place to analyse the risk greatly reduced of lithium, and battery safety can promotes, and life is longer.
Specifically, in the lithium ion battery of this embodiment, except that the negative pole piece adopts the utility model discloses the negative pole piece that above-mentioned embodiment provided, other all can be but not limited to use current material like positive pole piece, utmost point ear, diaphragm, electrolyte and shell etc. specifically select can satisfy the material of battery electrical property requirement can. And, also can but not be limited to the equipment process to lithium ion battery and adopt current process, will according to current mode the utility model discloses after negative pole piece, diaphragm, positive pole piece and utmost point ear etc. of above-mentioned embodiment are stacked gradually and are convoluteed into electric core, put into battery case, can obtain finished product lithium ion battery after flow such as toasting, notes liquid, seal, formation, ageing, partial volume.
For example, in this embodiment, the surface positive electrode sheet can be prepared by the following method: a conventional 16 μm-thick planar aluminum foil was prepared, and LiNi, an active material, was added0.5Co0.2Mn0.3O2The conductive agent Super-P and the adhesive PVDF are mixed according to the weight ratio of 95.5: 2.5: 2, fully and uniformly stirring the mixture in a solvent NMP, sieving the mixture to obtain positive electrode slurry, coating the obtained positive electrode slurry on the surface of a plane aluminum foil according to a conventional method, and baking, rolling and cutting the coating to obtain the positive electrode plate.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A current collector, characterized by: the current collector is provided with two opposite surfaces, two side grooves are formed in each surface at intervals along a first direction, the side grooves extend along a second direction perpendicular to the first direction, and the two side grooves on the same surface form a main body part of the current collector.
2. The current collector of claim 1, wherein: the cross section of the side groove along the depth direction is rectangular.
3. The current collector of claim 1, wherein: the depth of the side groove increases from one side close to the main body part to the other side far away from the main body part.
4. The current collector of claim 3, wherein: the bottom of the side groove is arc-shaped or inclined plane-shaped.
5. The current collector of any one of claims 1 to 4, wherein: the depth of the side groove is not more than 5 μm.
6. The current collector of any one of claims 1 to 4, wherein: the width of the notch of the side groove is 0.5 mm-50 mm.
7. The current collector of claim 6, wherein: the width of the notch of the side groove is 2 mm-15 mm.
8. The current collector of any one of claims 1 to 4, wherein: each surface is further provided with two blank parts at intervals along the first direction, the blank parts extend along the second direction, and the two side grooves on the same surface are respectively arranged between the corresponding main body part and the blank parts.
9. A negative pole piece is characterized in that: the current collector comprises the current collector of any one of claims 1 to 8 and a dressing layer covering the surface of the current collector, wherein the dressing layer comprises a middle layer and edge layers arranged on two opposite side portions of the middle layer along the length direction, the middle layer is matched and covered on the main body portion, the bottoms of the edge layers are filled in the side grooves, and the tops of the edge layers are exposed out of the side grooves.
10. A lithium ion battery, characterized by: comprising the negative electrode tab of claim 9.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113421996A (en) * | 2021-06-28 | 2021-09-21 | 珠海冠宇电池股份有限公司 | Negative plate, battery and manufacturing method of negative plate |
| CN113659105A (en) * | 2021-08-17 | 2021-11-16 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113421996A (en) * | 2021-06-28 | 2021-09-21 | 珠海冠宇电池股份有限公司 | Negative plate, battery and manufacturing method of negative plate |
| CN113659105A (en) * | 2021-08-17 | 2021-11-16 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
| CN113659105B (en) * | 2021-08-17 | 2022-12-27 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
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