CN115692723B - Composite current collector, battery cell, battery and preparation method of composite current collector - Google Patents
Composite current collector, battery cell, battery and preparation method of composite current collector Download PDFInfo
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- CN115692723B CN115692723B CN202211393484.1A CN202211393484A CN115692723B CN 115692723 B CN115692723 B CN 115692723B CN 202211393484 A CN202211393484 A CN 202211393484A CN 115692723 B CN115692723 B CN 115692723B
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- support film
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- current collector
- conductive foil
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- 239000002131 composite material Substances 0.000 title claims abstract description 64
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 239000011888 foil Substances 0.000 claims abstract description 162
- 238000005096 rolling process Methods 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 16
- 238000004519 manufacturing process Methods 0.000 claims description 15
- 238000007747 plating Methods 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims 1
- 238000003466 welding Methods 0.000 abstract description 42
- 239000000463 material Substances 0.000 description 8
- 238000003475 lamination Methods 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 238000005240 physical vapour deposition Methods 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical group N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 229920002799 BoPET Polymers 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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 invention discloses a composite current collector, an electric core, a battery and a preparation method of the composite current collector, wherein the composite current collector comprises the following components: a support and a conductive layer. The support body includes insulating support film and electrically conductive foil, and electrically conductive foil connects in the both ends in the width direction of insulating support film, and electrically conductive foil includes overlap joint portion and extension, overlap joint portion and insulating support film overlap joint, in the width direction of insulating support film, the extension is connected in the one side of keeping away from insulating support film of overlap joint portion and is extended outside the insulating support film, and the both sides in the thickness direction of support body are located to the conducting layer, and the conducting layer that is located the same side of support body covers in insulating support film and electrically conductive foil an organic whole. According to the composite current collector disclosed by the embodiment of the invention, the whole electrode lugs are of the conductive structure, so that the electrode lugs are easy to weld, and phenomena such as infirm welding or perforation can be avoided, so that the welding reliability of the electrode lugs can be improved, the conductivity and the connection reliability of the electrode lugs are improved, and the electrochemical performance of a battery is further improved.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a composite current collector, an electric core, a battery and a preparation method of the composite current collector.
Background
In recent years, battery technology has been exploded in the fields of power and energy storage, and higher requirements are also put on the safety of batteries while improving the energy density and the cycle life of the batteries. When the composite current collector is in short circuit, infinite resistance can be generated due to the insulating supporting layer and the special sandwich flame-retardant structure, so that the possibility of thermal runaway of the battery is effectively reduced. In addition, the composite current collector uses the insulating support layer to replace part of metal, so that the weight of the current collector is greatly reduced, the energy density of the battery is further improved, and the cost of raw materials is reduced, and therefore, the development of the composite current collector is attracting attention in recent years.
Although the composite current collector can greatly improve the safety performance of the battery, reduce the cost and improve the energy density, a plurality of technical difficulties still exist in the mass production and application process, and the technical difficulties are mainly manifested by welding difficulties. Specifically, the upper and lower metal layers of the composite current collector of the related art are not connected, and current cannot be conducted up and down after the die cutting is performed to form the tab. In the subsequent tab welding process, due to the existence of the insulating supporting layer, phenomena such as infirm welding or perforation and the like are often generated, the upper metal layer and the lower metal layer of the tab area cannot be effectively fused, the welding reliability is reduced, the conductivity and the connection reliability of the tab area are greatly influenced, and the electrochemical performance of the battery is further influenced. Accordingly, improvements are needed.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present invention is to provide a composite current collector, in which the whole tab is of a conductive structure, so that the tab is easy to weld, and phenomena such as weak welding or perforation can be avoided, thereby improving welding reliability of the tab, improving conductivity and connection reliability of the tab, and further improving electrochemical performance of a battery.
The invention also provides a battery cell with the composite current collector.
The invention also provides a battery with the battery cell.
The invention also provides a preparation method of the composite current collector.
An embodiment of a composite current collector according to the first aspect of the present invention includes: the support body comprises an insulating support film and a conductive foil, wherein the conductive foil is connected to two ends of the insulating support film in the width direction, the conductive foil comprises a lap joint part and an extension part, the lap joint part is overlapped with the insulating support film, and the extension part is connected to one side, far away from the insulating support film, of the lap joint part in the width direction of the insulating support film and extends out of the insulating support film; the conductive layers are arranged on two sides of the supporting body in the thickness direction, the conductive layers on the same side of the supporting body are integrally covered on the insulating supporting film and the conductive foil, and the conductive layers covered on the conductive foil at least cover the lap joint part; the extending part forms a tab or the extending part and the conductive layer covered on the extending part jointly forms the tab.
According to the composite current collector disclosed by the embodiment of the invention, the two ends of the insulating support film are connected and provided with the conductive foil to form the support body, and the two sides of the support body in the thickness direction are covered with the conductive layer with an integrated structure, so that the conductive foil and the conductive layer can be reliably and electrically connected as the conductive layer is integrally covered on the insulating support film and the conductive foil; and the part of the conductive foil extending out of the insulating support film is used as the tab, so that the tab is not required to be additionally welded on the composite current collector, and the step of additionally welding the tab is omitted. In addition, when the part of the conductive foil extending out of the insulating support film is used as the tab, in the subsequent welding process of the tab and other conductive parts, the tab is of a conductive structure, so that the tab is easy to weld, phenomena such as infirm welding or perforation and the like can be avoided, the welding reliability of the tab can be improved, the conductivity and the connection reliability of the tab are improved, and the electrochemical performance of the battery is further improved.
According to some embodiments of the invention, the conductive layer covering the conductive foil covers the overlap and the extension, which together form a tab.
According to some alternative embodiments of the invention, the projection of the conductive layer on a reference plane coincides with the projection of the support on the reference plane, the reference plane being a plane parallel to the insulating support film.
According to some alternative embodiments of the invention, the overlap portion has a width in the width direction of the insulating support film in the range of 0.5 to 1mm.
According to some alternative embodiments of the invention, the projection of the overlap onto the reference surface is a first projection, the projection of the conductive foil onto the reference surface is a second projection, the ratio of the area of the first projection to the area of the second projection is in the range of 15% -40%, and the reference surface is a plane parallel to the insulating support film.
According to some optional embodiments of the invention, the overlap portion includes an embedded portion and a protruding portion arranged in a thickness direction of the insulating support film, the embedded portion is embedded in the insulating support film in the thickness direction of the insulating support film, and the protruding portion protrudes from a surface of the insulating support film.
According to some alternative embodiments of the present invention, the thickness of the insulating support film is a, the thickness of the overlap portion is b, the thickness of the support body at the position where the overlap portion is located is c, and the value of c/(a+b) is in the range of 10% -95%.
According to some optional embodiments of the present invention, two sides in a thickness direction of the support body are a first side and a second side, the lap joint portion is overlapped on the first side of the support film, the conductive layer covered on the first side of the support body is a first conductive layer, the first conductive layer includes a first main conductive layer, a first auxiliary conductive layer and a first connection layer, and the first conductive layer is an integral structure; the surface of the insulating support film along the thickness direction and positioned on the first side is a first surface, the surface of the conductive foil along the thickness direction and positioned on the first side is a second surface, the side surface of the conductive foil along the width direction and adjacent to the first surface is a first side surface, at least part of the first side surface forms a first step surface, and the first step surface is connected with the first surface and the second surface; the first main conductive layer covers the first surface, the first auxiliary conductive layer covers the second surface, and the first connecting layer covers the first step surface.
According to some optional embodiments of the invention, the conductive layer covering the second side of the support is a second conductive layer, the second conductive layer including a second main conductive layer, a second auxiliary conductive layer, and a second connection layer, the second conductive layer being of unitary construction; the surface of the insulating support film along the thickness direction and positioned on the second side is a third surface, the surface of the conductive foil along the thickness direction and positioned on the second side is a fourth surface, the side surface of the insulating support film along the width direction is a second side surface, at least part of the second side surface forms a second step surface, and the second step surface is connected with the third surface and the fourth surface; the second main conductive layer covers the third surface, the second auxiliary conductive layer covers the fourth surface, and the second connecting layer covers the second step surface.
According to some embodiments of the invention, the conductive layer has a thickness of not less than 1 μm.
According to an embodiment of the second aspect of the present invention, a battery cell includes: a pole piece comprising a composite current collector according to an embodiment of the first aspect of the invention described above.
According to the battery cell provided by the embodiment of the invention, by arranging the composite current collector, in the process of welding the tab, the tab is easy to weld due to the fact that the whole tab is of a conductive structure, phenomena of infirm welding or perforation and the like can be avoided, so that the welding reliability of the tab can be improved, the conductivity and the connection reliability of the tab are improved, and the electrochemical performance of a battery is further improved.
According to an embodiment of the third aspect of the present invention, a battery includes: according to the embodiment of the second aspect of the invention, the battery cell is provided.
According to the battery provided by the embodiment of the invention, by arranging the battery core, in the process of welding the tab, the tab is easy to weld due to the fact that the whole tab is of a conductive structure, and phenomena such as infirm welding or perforation and the like can be avoided, so that the welding reliability of the tab can be improved, the conductivity and the connection reliability of the tab are improved, and the electrochemical performance of the battery is further improved.
The preparation method of the composite current collector according to the fourth aspect of the embodiment of the invention comprises the following steps: connecting conductive foils at both ends of an insulating support film in a width direction to form a support body, the conductive foils including a lap joint portion lap-jointed with the insulating support film and an extension portion extending beyond the insulating support film in the width direction of the insulating support film; plating conductive layers on two sides of the support body in the thickness direction, and integrally plating the conductive layers on the same side of the support body on the insulating support film and the conductive foil.
According to the preparation method of the composite current collector, the conductive foil is firstly arranged at the two ends of the insulating support film in a connecting mode to form the support body, and then the conductive layers are plated at the two sides of the thickness direction of the support body, and the conductive layers are integrally covered on the insulating support film and the conductive foil, so that reliable electric connection between the conductive foil and the conductive layer can be realized; and the part of the conductive foil extending out of the insulating support film is used as the tab, so that the tab is not required to be additionally welded on the composite current collector, and the step of additionally welding the tab is omitted. In addition, when the part of the conductive foil extending out of the insulating support film is used as the tab, in the subsequent welding process of the tab and other conductive parts, the tab is of a conductive structure, so that the tab is easy to weld, phenomena such as infirm welding or perforation and the like can be avoided, the welding reliability of the tab can be improved, the conductivity and the connection reliability of the tab are improved, and the electrochemical performance of the battery is further improved.
According to some embodiments of the invention, the conductive foil is lapped to the insulating support film by a roll process.
According to some alternative embodiments of the invention, the rolling process comprises a pressure roller by which the conductive foil is roll-bonded to the insulating support film.
In some alternative embodiments of the invention, the roll-in parameters of the pressure roll include an over-roll pressure, a roll-in speed, and a roll-in temperature, the over-roll pressure being greater than 20t, the roll-in speed being between 10 and 80m/min, and the roll-in temperature being between 25 and 80 ℃.
In some alternative embodiments of the present invention, the surface of at least one of the lap joint and the insulating support film is roughened before the conductive foil is roll-bonded to the insulating support film by the pressure roller.
According to some embodiments of the present invention, a plurality of insulating support films are sequentially arranged at intervals along a width direction of the insulating support films, two adjacent insulating support films are connected through the conductive foil, and after the conductive layer is plated on two sides of the support body in a thickness direction, the conductive foil between the two adjacent insulating support films is cut to form a plurality of composite current collectors.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
Fig. 1 is a cross-sectional view of a composite current collector according to some embodiments of the invention;
FIG. 2 is a schematic view of a support of the composite current collector of FIG. 1;
FIG. 3 is a schematic view of the support of the composite current collector of FIG. 1 at another angle;
fig. 4 is a schematic view of a support body of a composite current collector according to other embodiments of the present invention;
fig. 5 is a schematic view of a splice of a plurality of insulating support films in a method of manufacturing a composite current collector according to some embodiments of the present invention;
fig. 6 is a schematic view of a roll-in process in a method of preparing a composite current collector according to some embodiments of the invention;
fig. 7 is a schematic illustration of a composite current collector before and after rolling according to some embodiments of the invention.
Reference numerals:
100. a composite current collector;
10. a support body; 11. a first side; 12. a second side;
20. an insulating support film; 21. a first surface; 22. a third surface; 23. a second step surface; 24. a second side;
30. a conductive foil; 31. a lap joint; 311. an embedding part; 312. a protruding portion; 32. an extension; 33. a second surface; 34. a fourth surface; 35. a first step surface; 36. a first side;
40. a conductive layer; 41. a first conductive layer; 411. a first main conductive layer; 412. a first auxiliary conductive layer; 413. a first connection layer; 42. a second conductive layer; 421. a second main conductive layer; 422. a second auxiliary conductive layer; 423. a second connection layer;
50. A pressure roller; 51. a pressure roller shaft; 52. a roll gap; 60. a tension roller; 61. tension roller.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
A composite current collector 100 according to an embodiment of the present invention is described below with reference to fig. 1 to 4.
Referring to fig. 1, a composite current collector 100 according to an embodiment of the first aspect of the present invention includes: a support 10 and a conductive layer 40.
Wherein the support body 10 includes an insulating support film 20 and a conductive foil 30, and the conductive foil 30 is connected to both ends of the insulating support film 20 in the width direction (for example, refer to e1 direction in fig. 1 to 4), that is, both ends of the insulating support film 20 in the width direction are connected with the conductive foil 30. In the width direction of the insulating support film 20, a portion of the conductive foil 30 extends beyond the insulating support film 20. For example, when a portion of the conductive foil 30 overlaps the insulating support film 20, another portion of the conductive foil 30 extends beyond the insulating support film 20 in the width direction of the insulating support film 20.
The conductive foil 30 includes a lap portion 31 and an extension portion 32, the lap portion 31 overlaps with a portion of the insulating support film 20, the extension portion 32 is connected to a side of the lap portion 31 away from the insulating support film 20 in a width direction of the insulating support film 20, and the extension portion 32 extends out of the insulating support film 20, at this time, the extension portion 32 may serve as a tab. By lap-connecting the conductive foil 30 with the insulating support film 20, the connection area of the conductive foil 30 with the insulating support film 20 can be increased, and the reliability and stability of the connection between the conductive foil 30 and the insulating support film 20 can be improved.
The projection of the conductive foil 30 on the reference plane overlaps with the projection of the insulating support film 20 on the reference plane, the reference plane is a plane parallel to the insulating support film 20, the overlapping portion of the projection of the conductive foil 30 on the reference plane and the projection of the insulating support film 20 on the reference plane is a lap joint portion of the conductive foil 30 and the insulating support film 20, and the non-overlapping portion of the projection of the conductive foil 30 on the reference plane and the projection of the insulating support film 20 on the reference plane is an extension portion of the conductive foil 30 extending out of the insulating support film 20.
Alternatively, the insulating support film 20 may be a resin film, for example, the insulating support film 20 may be a PET film.
Alternatively, the conductive foil 30 may be a metal foil, for example, the conductive foil 30 may be an aluminum foil or a copper foil.
The conductive layers 40 are provided on both sides in the thickness direction of the support body 10 (for example, refer to e2 direction in fig. 1), that is, both sides in the thickness direction of the support body 10 are provided with the conductive layers 40, and the conductive layers 40 may be plated on both sides in the thickness direction of the support body 10. The conductive layer 40 on the same side of the support body 10 integrally covers the insulating support film 20 and the conductive foil 30, and the conductive layer 40 covering the conductive foil 30 at least covers the lap joint portion 31, so that reliable electrical connection between the conductive foil 30 and the conductive layer 40 can be realized due to the fact that the conductive layer 40 integrally covers the insulating support film 20 and the conductive foil 30.
Alternatively, the conductive layer 40 may be a metal layer, for example, the conductive layer 40 may be a copper layer or an aluminum layer.
Alternatively, the conductive layer 40 may be a plating layer, for example, the conductive layer 40 may be a copper plating layer or an aluminum plating layer, for example, the conductive layer 40 may be plated on both sides in the thickness direction of the support body 10 using a plating, chemical vapor deposition, physical vapor deposition, or the like process.
Optionally, referring to fig. 1, the conductive layer 40 covering the conductive foil 30 covers the lap joint portion 31 and the extension portion 32, and the extension portion 32 and the conductive layer covering the extension portion 32 together form a tab. Therefore, the overall thickness of the tab is larger, the resistance is smaller, and the tab has better conductivity and overlarge current capacity.
Alternatively, referring to fig. 1, the projection of the conductive layer 40 on the reference plane coincides with the projection of the support body 10 on the reference plane, which is a plane parallel to the insulating support film. This allows the conductive layer 40 to completely cover both sides of the support 10 in the thickness direction, resulting in a composite current collector having higher overall structural strength and better overall conductivity. Since the portion of the conductive foil 30 extends beyond the insulating support film 20, the portion of the conductive foil 30 extending beyond the insulating support film 20 may be regarded as a tab, i.e., the extension 32 may be regarded as a tab. If the conductive layer 40 covers the portion of the conductive foil 30 extending beyond the insulating support film 20, the portion of the conductive foil 30 extending beyond the insulating support film 20 and the conductive layer 40 covering the portion of the conductive foil 30 may be collectively referred to as a tab, i.e., if the conductive layer 40 covers the extension portion 32, the extension portion 32 and the conductive layer 40 covering the extension portion 32 are collectively referred to as a tab.
Thus, whether the part of the conductive foil 30 extending to the insulating support film 20 is used as a tab, or the part of the conductive foil 30 extending to the insulating support film 20 and the whole conductive layer 40 covering the conductive foil 30 at the part can be used as a tab, the whole tab is of a conductive structure, so that the tab is easy to weld in the subsequent welding process of the tab, the phenomena of infirm welding or perforation and the like can be avoided, the welding reliability of the tab can be improved, the conductivity and the connection reliability of the tab can be improved, and the electrochemical performance of the battery can be further improved.
According to the composite current collector 100 of the embodiment of the invention, the conductive foil 30 is connected and arranged at two ends of the insulating support film 20 to form the support body 10, and the conductive layers 40 with integrated structures are covered at two sides of the thickness direction of the support body 10, and the conductive layers 40 are integrally covered on the insulating support film 20 and the conductive foil 30, so that reliable electrical connection between the conductive foil 30 and the conductive layers 40 can be realized; and, the part of the conductive foil 30 extending to the outside of the insulating support film 20 is used as the tab, so that the tab is not required to be additionally welded on the composite current collector, and the step of additionally welding the tab is omitted. In addition, when the part of the conductive foil extending out of the insulating support film is used as the tab, in the subsequent welding process of the tab and other conductive parts, the tab is of a conductive structure, so that the tab is easy to weld, phenomena such as infirm welding or perforation and the like can be avoided, the welding reliability of the tab can be improved, the conductivity and the connection reliability of the tab are improved, and the electrochemical performance of the battery is further improved.
According to some alternative embodiments of the present invention, referring to fig. 1, 3 and 4, the width of the overlap portion 31 in the width direction of the insulating support film 20 is L, and the value of the width L of the overlap portion 31 in the width direction of the insulating support film 20 ranges from 0.5 to 1mm. By setting the width of the overlap 31 in the width direction of the insulating support film 20 between 0.5 and 1mm, the overlap width between the conductive foil 30 and the insulating support film 20 is ensured, so that the reliability and stability of the connection between the conductive foil 30 and the insulating support film 20 can be ensured; also, in the case where the width of the extension portion 32 in the width direction of the insulating support film 20 is constant, the material consumption of the conductive foil 30 can be reduced and the cost can be saved while ensuring the reliability and stability of the connection between the conductive foil 30 and the insulating support film 20.
According to some alternative embodiments of the present invention, referring to fig. 1 to 4, the projection of the overlap 31 on the reference plane is a first projection, the projection of the conductive foil 30 on the reference plane is a second projection, and the ratio of the area of the first projection to the area of the second projection ranges from 15% to 40%, and the reference plane is a plane parallel to the insulating support film 20. By setting the ratio of the overlapping portion of the conductive foil 30 and the insulating support film 20 between 15% and 40%, the conductive foil 30 and the insulating support film 20 can have a larger connection area, thereby improving the reliability and stability of the connection between the conductive foil 30 and the insulating support film 20; also, in the case where the conductive foil 30 has a certain size, the size of the extension 32 can be ensured, and thus the size of the tab can be ensured.
According to some alternative embodiments of the present invention, referring to fig. 1 and 3, a portion of the overlap 31 is embedded in the insulating support film 20 in the thickness direction of the insulating support film 20, and for example, the portion of the overlap 31 may be pressed into the insulating support film 20 in the thickness direction of the insulating support film 20 by pressure. By embedding a portion of the overlap portion 31 into the insulating support film 20 in the thickness direction of the insulating support film 20 so that the overlap portion 31 is fixedly connected to the insulating support film 20 by the embedding, the connection strength of the conductive foil 30 and the insulating support film 20 can be improved.
Specifically, referring to fig. 1 and 3, the overlap portion 31 includes an embedded portion 311 and a protruding portion 312 arranged in the thickness direction of the insulating support film 20, the embedded portion 311 is embedded in the insulating support film 20 in the thickness direction of the insulating support film 20, and the protruding portion 312 protrudes from the surface of the insulating support film 20. This can make each part of the overlap 31 uniformly embedded into the insulating support film 20, and increase the embedded area between the overlap 31 and the insulating support film 20, thereby further increasing the connection strength of the conductive foil 30 and the insulating support film 20.
According to some alternative embodiments of the present invention, referring to fig. 1 and 3, the insulating support film 20 has a thickness a, the conductive foil 30 has a thickness b, the support body 10 has a thickness c at the location of the lap portion 31, and the value of c/(a+b) ranges from 10% to 95%. The ratio range may define the thickness of the overlap portion 31 embedded into the insulating support film 20, so that the thickness of the overlap portion 31 embedded into the insulating support film 20 is reasonably set, and the connection strength between the conductive foil 30 and the insulating support film 20 may be higher.
According to some alternative embodiments of the present invention, referring to fig. 1 to 4, two sides of the support body 10 in the thickness direction are a first side 11 and a second side 12, respectively, the lap portion 31 is overlapped on the first side 11 of the support film, the conductive layer 40 covering the first side 11 of the support body 10 is a first conductive layer 41, the first conductive layer 41 includes a first main conductive layer 411, a first auxiliary conductive layer 412 and a first connection layer 413, and the first conductive layer 41 is a unitary structure. The surface of the insulating support film 20 in the thickness direction and located at the first side 11 is a first surface 21, the surface of the conductive foil 30 in the thickness direction and located at the first side 11 is a second surface 33, the side surface of the conductive foil 30 in the width direction and adjacent to the first surface 21 is a first side surface 36, at least part of the first side surface 36 constitutes a first step surface 35, and the first step surface 35 connects the first surface 21 and the second surface 33.
For example, referring to fig. 4, when the overlap portion 31 is not embedded in the insulating support film 20 and the entire overlap portion 31 is provided so as to protrude from the insulating support film 20, all of the first side surfaces 36 constitute the first step surface 35; referring to fig. 1 and 3, when a portion of the overlap portion 31 is embedded in the insulating support film 20 and another portion of the overlap portion 31 is integrally protruded from the insulating support film 20, a portion of the first side surface 36 constitutes a first step surface 35. For example, referring to fig. 1 and 3, when the fitting portion 311 of the overlap portion 31 is fitted into the insulating support film 20 and the protruding portion 312 of the overlap portion 31 protrudes from the insulating support film 20, the side surface of the overlap portion 31 in the width direction and adjacent to the first surface 21 constitutes the first side surface 36, and a portion of the first side surface 36 constitutes the above-described first step surface 35, and at this time, the side surface of the protruding portion 312 in the width direction and adjacent to the first surface 21 constitutes the first step surface 35.
Wherein the first main conductive layer 411 covers the first surface 21, and the first main conductive layer 411 is located between the two conductive foils 30; the first auxiliary conductive layer 412 covers the second surface 33, for example, the first auxiliary conductive layer 412 may cover the entire second surface 33, or the first auxiliary conductive layer 412 may cover a portion of the second surface 33; also, the first connection layer 413 covers the first step surface 35, for example, the first connection layer 413 may cover the entire first step surface 35. Thus, the first main conductive layer 411 may be electrically connected to the conductive foil 30 through the first connection layer 413 and the first auxiliary conductive layer 412, so that a contact area between the first conductive layer 41 and the conductive foil 30 may be increased, and thus reliability and stability of connection between the first conductive layer 41 and the conductive foil 30 may be improved, and thus stable conductivity between the first conductive layer 41 and the conductive foil 30 may be improved; in addition, the first main conductive layer 411, the first auxiliary conductive layer 412 and the first connection layer 413 are formed into a continuous integrated conductive structure, so that the overall structure is more stable, and the conductive effect is better and more stable.
According to some alternative embodiments of the present invention, referring to fig. 1-4, the conductive layer 40 covering the second side 12 of the support body 10 is a second conductive layer 42, the second conductive layer 42 includes a second main conductive layer 421, a second auxiliary conductive layer 422, and a second connection layer 423, and the second conductive layer 42 is a unitary structure. The surface of the insulating support film 20 in the thickness direction and located on the second side 12 is a third surface 22, the surface of the conductive foil 30 in the thickness direction and located on the second side 12 is a fourth surface 34, the side surface of the insulating support film 20 in the width direction is a second side surface 24, at least part of the second side surface 24 constitutes a second step surface 23, and the second step surface 23 connects the third surface 22 and the fourth surface 34.
For example, referring to fig. 4, when the overlap portion 31 is not embedded in the insulating support film 20 and the entire overlap portion 31 is provided so as to protrude from the insulating support film 20, the entirety of the second side surface 24 constitutes the second step surface 23; referring to fig. 1 and 3, when a portion of the overlap portion 31 is embedded in the insulating support film 20 and another portion of the overlap portion 31 is integrally protruded from the insulating support film 20, a portion of the second side surface 24 constitutes the second step surface 23.
Wherein the second main conductive layer 421 covers the third surface 22, and the second main conductive layer 421 completely covers the third surface 22; the second auxiliary conductive layer 422 covers the fourth surface 34, for example, the second auxiliary conductive layer 422 may cover the entire fourth surface 34, or the second auxiliary conductive layer 422 may cover a portion of the fourth surface 34; also, the second connection layer 423 covers the second step surface 23, for example, the second connection layer 423 may cover the entire second step surface 23. In this way, the second main conductive layer 421 can be electrically connected with the conductive foil 30 through the second connection layer 423 and the second auxiliary conductive layer 422, so that the contact area between the second conductive layer 42 and the conductive foil 30 can be increased, and the reliability and stability of the connection between the second conductive layer 42 and the conductive foil 30 can be improved, and the stable conductivity between the second conductive layer 42 and the conductive foil 30 can be improved; in addition, the second main conductive layer 421, the second auxiliary conductive layer 422 and the second connection layer 423 are formed into a continuous integrated conductive structure, so that the overall structure is more stable, and the conductive effect is better and more stable.
According to some embodiments of the invention, referring to fig. 1, the thickness d of the conductive layer 40 is not less than 1 μm. The thickness d of the conductive layer 40 is too small to ensure that the conductive layer 40 completely covers the surface of the insulating support film 20 and the surface of the conductive foil 30, and by setting the thickness d of the conductive layer 40 to be not less than 1 μm, the thickness can ensure that the conductive layer 40 can completely cover the surface of the insulating support film 20 and the surface of the conductive foil 30, and ensure the continuous integrity of the conductive layer 40, thereby ensuring that the conductive layer 40 and the conductive foil 30 are electrically connected stably and improving the overall performance.
According to an embodiment of the second aspect of the present invention, a battery cell includes: a pole piece comprising a composite current collector 100 according to an embodiment of the first aspect of the invention described above.
According to the battery cell provided by the embodiment of the invention, by arranging the composite current collector 100, in the process of welding the electrode lugs, the electrode lugs are easy to weld due to the fact that the whole electrode lugs are of the conductive structure, so that phenomena of infirm welding or perforation and the like can be avoided, the welding reliability of the electrode lugs can be improved, the conductivity and the connection reliability of the electrode lugs are improved, and the electrochemical performance of the battery is further improved.
According to an embodiment of the third aspect of the present invention, a battery includes: according to the embodiment of the second aspect of the invention, the battery cell is provided. The battery of this embodiment may be a single battery, a battery module, or a battery pack.
According to the battery provided by the embodiment of the invention, by arranging the battery core, in the process of welding the tab, the tab is easy to weld due to the fact that the whole tab is of a conductive structure, and phenomena such as infirm welding or perforation and the like can be avoided, so that the welding reliability of the tab can be improved, the conductivity and the connection reliability of the tab are improved, and the electrochemical performance of the battery is further improved.
Referring to fig. 5 to 7 in combination with fig. 1 to 4, a method of manufacturing a composite current collector 100 according to a fourth aspect of the present invention includes the steps of:
the conductive foil 30 may be first connected at both ends in the width direction of the insulating support film 20 to form the support body 10, the conductive foil 30 including a lap joint portion 31 and an extension portion 32, the lap joint portion 31 overlapping the insulating support film 20, in the width direction of the insulating support film 20 such that the extension portion 32 extends out of the insulating support film 20, a portion of the conductive foil 30 extending to the outside of the insulating support film 20 may serve as a tab;
the conductive layers 40 are plated on both sides of the support body 10 in the thickness direction, and the conductive layers 40 on the same side of the support body 10 are integrally plated on the insulating support film 20 and the conductive foil 30, so that when the extending portion 32 is covered with the conductive layers 40, the extending portion 32 and the conductive layers 40 covered on the extending portion 32 can be used together as a tab.
The conductive layer 40 may be formed on two sides of the support body 10 in the thickness direction by adopting a deposition and electroplating method, the deposition may include, but is not limited to, physical vapor deposition and chemical vapor deposition, and after the subsequent electroplating treatment, the thickness of the formed conductive layer 40 is larger, for example, the thickness d of the conductive layer 40 is not smaller than 1 μm, and this thickness can ensure that the conductive layer 40 can completely cover the surface of the insulating support film 20 and the surface of the conductive foil 30, and ensure the continuous integrity of the conductive layer 40, thereby ensuring that the conductive layer 40 and the conductive foil 30 are stably electrically connected and improving the overall performance.
The method for manufacturing the composite current collector 100 of this embodiment may manufacture the composite current collector 100 of the embodiment of the first aspect described above. Since the portion of the conductive foil 30 extends beyond the insulating support film 20, the portion of the conductive foil 30 extending beyond the insulating support film 20 may be regarded as a tab, i.e., the extension 32 may be regarded as a tab. If the conductive layer 40 covers the portion of the conductive foil 30 extending to the outside of the insulating support film 20, the portion of the conductive foil 30 extending to the insulating support film 20 and the conductive layer 40 covering the portion of the conductive foil 30 may be collectively used as a tab, i.e., when the extending portion 32 is covered with the conductive layer 40, the extending portion 32 and the conductive layer 40 covering the extending portion 32 may be collectively used as a tab.
Thus, whether the part of the conductive foil 30 extending to the insulating support film 20 is used as a tab, or the part of the conductive foil 30 extending to the insulating support film 20 and the whole conductive layer 40 covering the conductive foil 30 at the part can be used as a tab, the whole tab is of a conductive structure, so that the tab is easy to weld in the subsequent welding process of the tab, the phenomena of infirm welding or perforation and the like can be avoided, the welding reliability of the tab can be improved, the conductivity and the connection reliability of the tab can be improved, and the electrochemical performance of the battery can be further improved.
According to the preparation method of the composite current collector 100 of the embodiment of the invention, the conductive foil 30 is connected and arranged at two ends of the insulating support film 20 to form the support body 10, and then the conductive layer 40 is plated at two sides of the thickness direction of the support body 10, and the conductive foil 30 and the conductive layer 40 can be reliably and electrically connected as the conductive layer 40 is integrally covered on the insulating support film 20 and the conductive foil 30; and, the part of the conductive foil 30 extending to the outside of the insulating support film 20 is used as the tab, so that the tab is not required to be additionally welded on the composite current collector, and the step of additionally welding the tab is omitted. In addition, when the part of the conductive foil 30 extending to the outside of the insulating support film 20 is used as the tab, in the subsequent welding process of the tab and other conductive components, the entire tab is of a conductive structure, so that the tab is easy to weld, phenomena such as infirm welding or perforation can be avoided, the welding reliability of the tab can be improved, the conductivity and the connection reliability of the tab can be improved, and the electrochemical performance of the battery can be further improved.
According to some embodiments of the present invention, referring to fig. 6 and 7, the conductive foil 30 is overlapped to the insulating support film 20 through a rolling process, for example, the overlapped portion 31 of the conductive foil 30 and the insulating support film 20 may be overlapped in the thickness direction of the insulating support film 20, and then the overlapped portion 31 and the insulating support film 20 are rolled through the rolling process such that a portion of the overlapped portion 31 of the conductive foil 30 is embedded into the insulating support film 20 in the thickness direction of the insulating support film 20. The conductive foil 30 can be conveniently connected and fixed to both ends of the insulating support film 20 by the rolling process, and the portion of the conductive foil 30 can be press-fitted into the insulating support film 20 by the rolling method, so that the connection strength between the conductive foil 30 and the insulating support film 20 can be improved.
According to some alternative embodiments of the present invention, referring to fig. 6, the rolling process includes a pressure roller 50, and the conductive foil 30 and the insulating support film 20 are press-coupled by the pressure roller 50. For example, the pressure roller 50 may include at least one pair of pressure roller shafts 51, and a roller gap 52 is defined between the pair of pressure roller shafts 51, and the width of the roller gap 52 is smaller than the sum of the thickness of the insulating support film 20 and the thickness of the conductive foil 30, specifically, the width of the roller gap 52 is smaller than the sum of the thickness of the insulating support film 20 and the thickness of the overlap 31. Overlapping portion 31 of conductive foil 30 and insulating support film 20 are overlapped, and the overlapped portion is placed in roll gap 52, and rolled by pressure roller 50, so that overlapping portion 31 of conductive foil 30 and the overlapped portion of insulating support film 20 can be press-connected into a whole, and overlapping portion 31 of conductive foil 30 can be press-fitted into insulating support film 20, the thickness of overlapping portion 31 pressed into insulating support film 20 can be controlled by controlling rolling parameters, for example, the thickness of overlapping portion 31 pressed into insulating support film 20 can be controlled by controlling the over-rolling pressure and rolling temperature.
In some alternative embodiments of the present invention, the roll pressure parameters of pressure roll 50 may include the over-roll pressure, the roll speed, and the roll temperature.
Wherein the over-rolling pressure is greater than 20t, the over-rolling pressure is a major factor affecting the thickness of the conductive foil 30 pressed into the insulating support film 20, and by controlling the over-rolling pressure so that the over-rolling pressure is greater than 20t, it is possible to ensure that the thickness of the conductive foil 30 pressed into the insulating support film 20 is greater, thereby making the connection strength between the conductive foil 30 and the insulating support film 20 higher, and making the total thickness of the overlapped portion of the conductive foil 30 and the insulating support film 20 smaller.
The rolling speed can be 10-80m/min, and the higher the rolling speed is, the higher the production efficiency is; the smaller the rolling speed is, the more favorable the control of the rate of merit is, and the higher the rate of merit is. By setting the rolling speed between 10 and 80m/min, the production efficiency and the rolling quality can be better considered.
The rolling temperature may be 25-80 ℃, and the higher the temperature, the easier the insulating support film 20 is deformed, and the more easily the insulating support film 20 is adhered to the pressure roller 50, so that not only the current rolling quality is affected, but also the subsequent rolling quality is affected, for example, defects such as pits are easily generated on the conductive foil 30 or the insulating support film 20 in the subsequent production process. By setting the rolling temperature between 25 ℃ and 80 ℃, the thickness of the conductive foil 30 pressed into the insulating support film 20 can be ensured and controlled, the insulating support film 20 is prevented from being deformed greatly to influence the overall quality of the composite current collector 100, the insulating support film 20 is prevented from being adhered to the pressure roller 50 due to overhigh temperature, and the rolling quality is ensured.
In some alternative embodiments of the present invention, before the conductive foil 30 is press-connected with the insulating support film 20 by the pressure roller 50, the surface of at least one of the lap portion and the insulating support film 20 may be roughened, for example, the surface of the lap portion 31 facing the insulating support film 20 may be roughened, for example, the surface of the insulating support film 20 facing the lap portion 31 may be roughened, or both the surface of the lap portion 31 facing the insulating support film 20 and the surface of the insulating support film 20 facing the lap portion 31 may be roughened. By roughening the lamination surface of one of the conductive foil 30 and the insulating support film 20 before the conductive foil 30 and the insulating support film 20 are laminated by the pressure roller 50, the strength of the connection between the conductive foil 30 and the insulating support film 20 can be further improved during lamination of the laminated portion of the conductive foil 30 and the insulating support film 20 by the pressure roller 50.
In some alternative embodiments of the present invention, referring to fig. 6, the rolling process may further include a tension roller 60, the tension roller 60 is located at the downstream side of the pressure roller 50, the tension roller 60 may include a plurality of tension rollers 61 arranged at intervals, the lamination area of the conductive foil 30 of the support body 10 and the insulating support film 20 may be wound around the plurality of tension rollers 61, and the lamination area of the conductive foil 30 and the insulating support film 20 may be subjected to tension adjustment by the tension roller 60 through the lamination area formed after the lamination connection of the pressure roller 50. The insulating support film 20 and the conductive foil 30 are made of different materials, so that the two materials are tightly combined together, and when the two materials are combined, the tension of the two materials can be adjusted to match the tension of the two materials, so that the stress is released, and the stress concentration is avoided.
According to some embodiments of the present invention, referring to fig. 5, a plurality of insulating support films 20 may be sequentially arranged at intervals in a width direction of the insulating support films 20, adjacent two insulating support films 20 are connected by a conductive foil 30, and after the conductive layer 40 is plated on both sides of the support body 10 in a thickness direction, the conductive foil 30 between the adjacent two insulating support films 20 is slit to form a plurality of composite current collectors 100. Thus, large-scale manufacture can be realized, and the production efficiency is improved.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (15)
1. A composite current collector, comprising:
the support body comprises an insulating support film and a conductive foil, wherein the conductive foil is connected to two ends of the insulating support film in the width direction, the conductive foil comprises a lap joint part and an extension part, the lap joint part is overlapped with the insulating support film, and the extension part is connected to one side, far away from the insulating support film, of the lap joint part in the width direction of the insulating support film and extends out of the insulating support film;
the conductive layers are arranged on two sides of the supporting body in the thickness direction, the conductive layers on the same side of the supporting body are integrally covered on the insulating supporting film and the conductive foil, and the conductive layers covered on the conductive foil at least cover the lap joint part;
wherein the extending part forms a tab or the extending part and the conductive layer covered on the extending part jointly forms a tab;
the lap joint part comprises an embedded part and a protruding part which are arranged along the thickness direction of the insulating support film, the embedded part is embedded into the insulating support film along the thickness direction of the insulating support film, and the protruding part protrudes out of the surface of the insulating support film;
The two sides of the supporting body in the thickness direction are a first side and a second side respectively, the lap joint part is lapped on the first side of the supporting film, the conducting layer covered on the first side of the supporting body is a first conducting layer, the first conducting layer comprises a first main conducting layer, a first auxiliary conducting layer and a first connecting layer, and the first conducting layer is of an integrated structure; the surface of the insulating support film along the thickness direction and positioned on the first side is a first surface, the surface of the conductive foil along the thickness direction and positioned on the first side is a second surface, the side surface of the conductive foil along the width direction and adjacent to the first surface is a first side surface, at least part of the first side surface forms a first step surface, and the first step surface is connected with the first surface and the second surface; the first main conductive layer covers the first surface, the first auxiliary conductive layer covers the second surface, and the first connecting layer covers the first step surface;
the conductive layer covered on the second side of the support body is a second conductive layer, the second conductive layer comprises a second main conductive layer, a second auxiliary conductive layer and a second connecting layer, and the second conductive layer is of an integrated structure; the surface of the insulating support film along the thickness direction and positioned on the second side is a third surface, the surface of the conductive foil along the thickness direction and positioned on the second side is a fourth surface, the side surface of the insulating support film along the width direction is a second side surface, at least part of the second side surface forms a second step surface, and the second step surface is connected with the third surface and the fourth surface; the second main conductive layer covers the third surface, the second auxiliary conductive layer covers the fourth surface, and the second connecting layer covers the second step surface.
2. The composite current collector of claim 1 wherein said conductive layer overlying said conductive foil overlies said overlap and said extension, said extension and said conductive layer overlying said extension together forming a tab.
3. The composite current collector of claim 2 wherein the projection of the conductive layer onto a reference plane coincides with the projection of the support onto the reference plane, the reference plane being a plane parallel to the insulating support film.
4. The composite current collector according to claim 1, wherein the overlap portion has a width in the width direction of the insulating support film in the range of 0.5 to 1mm.
5. The composite current collector of claim 1, wherein the projection of the overlap onto the reference surface is a first projection, the projection of the conductive foil onto the reference surface is a second projection, the ratio of the area of the first projection to the area of the second projection is in the range of 15% -40%, and the reference surface is a plane parallel to the insulating support film.
6. The composite current collector of claim 1, wherein the insulating support film has a thickness a, the overlap portion has a thickness b, the support body has a thickness c at the position of the overlap portion, and the value of c/(a+b) ranges from 10% to 95%.
7. The composite current collector according to any one of claims 1 to 6, wherein the thickness of the conductive layer is not less than 1 μm.
8. A cell, comprising: a pole piece comprising a composite current collector according to any one of claims 1-7.
9. A battery, comprising: the cell of claim 8.
10. A method of manufacturing a composite current collector according to any one of claims 1 to 7, comprising:
connecting conductive foils at both ends of an insulating support film in a width direction to form a support body, the conductive foils including a lap joint portion lap-jointed with the insulating support film and an extension portion extending beyond the insulating support film in the width direction of the insulating support film;
plating conductive layers on two sides of the support body in the thickness direction, and integrally plating the conductive layers on the same side of the support body on the insulating support film and the conductive foil.
11. The method of manufacturing a composite current collector according to claim 10, wherein the conductive foil is lapped to the insulating support film by a roll process.
12. The method of manufacturing a composite current collector according to claim 11, wherein the rolling process includes a pressure roller by which the conductive foil and the insulating support film are roll-bonded.
13. The method of manufacturing a composite current collector according to claim 12, wherein the rolling parameters of the pressure roller include an over-roller pressure, a rolling speed, and a rolling temperature, the over-roller pressure is greater than 20t, the rolling speed is 10-80m/min, and the rolling temperature is 25-80 ℃.
14. The method of manufacturing a composite current collector according to claim 12, wherein a surface of at least one of the lap joint and the insulating support film is roughened before the conductive foil and the insulating support film are roll-pressed and connected by the pressing roller.
15. The method for manufacturing a composite current collector according to any one of claims 10 to 14, wherein a plurality of the insulating support films are sequentially arranged at intervals in a width direction of the insulating support films, adjacent two of the insulating support films are connected by the conductive foil, and after the conductive layer is plated on both sides in a thickness direction of the support body, the conductive foil between the adjacent two of the insulating support films is slit to form a plurality of the composite current collectors.
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| CN115692723A (en) | 2023-02-03 |
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