CN219067165U - Multilayer current collector tab and composite current collector structure - Google Patents
Multilayer current collector tab and composite current collector structure Download PDFInfo
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- CN219067165U CN219067165U CN202223310743.8U CN202223310743U CN219067165U CN 219067165 U CN219067165 U CN 219067165U CN 202223310743 U CN202223310743 U CN 202223310743U CN 219067165 U CN219067165 U CN 219067165U
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- current collector
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- collector tab
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The utility model discloses a multilayer current collector tab and a composite current collector structure, wherein the multilayer current collector tab is formed by the composite current collector structure, the composite current collector structure comprises a first metal layer, a second metal layer and a support body, the first metal layer and the second metal layer are oppositely arranged, the support body is arranged between the first metal layer and the second metal layer, each layer of current collector tab in the multilayer current collector tab respectively comprises at least one through hole, and each through hole contained in the multilayer current collector tab forms a filling area for filling a conductive part. After the conductive part is filled in the filling area, and after the lugs are welded, electrical conduction can be realized among the metal layers of the lugs of the current collector layers, so that the problems that the internal resistance of the battery core is large, the current density distribution is uneven, the lugs are easy to fall off due to low tensile strength of the lugs and the like are caused by the fact that the metal layers on two sides cannot be directly conducted after the lugs are welded due to the fact that the middle layer of the composite current collector is a polymer with relative metal insulation in the prior art.
Description
Technical Field
The utility model relates to the technical field of battery manufacturing, in particular to a multilayer current collector lug and a composite current collector structure.
Background
The ion battery has the advantages of high energy density, excellent power performance, long cycle life and the like, and is widely popularized and applied in the field of new energy automobiles.
The current collector is used as an important component in the ion battery, and has the function of collecting current generated by active substances of the ion battery to form larger current for external output. The use of the composite current collector structure can further improve energy density, toughness and ductility, thereby realizing process optimization in production, and improving energy density per unit mass and safety. The composite current collector adopts the light polymer as a support body in the middle, and metal conductive layers are attached to the two sides, so that the safety performance of battery extrusion, needling and the like is effectively improved, and the weight of the current collector is reduced. However, in the composite current collector with the metal-polymer-metal structure, the middle layer is a polymer insulated from the metal, so that after the electrode lugs are welded, the metal layers on two sides cannot be directly conducted, and the problems of large internal resistance of a battery core, uneven current density distribution, easy falling off caused by low tensile strength of the electrode lugs and the like occur in actual use.
Disclosure of Invention
The utility model provides a multilayer current collector tab and a composite current collector structure, which are used for solving the problems that after the tab is welded due to the fact that the middle of the existing composite current collector is a polymer with relative metal insulation, metal layers on two sides cannot be directly conducted, so that the internal resistance of a battery core is large, the current density is unevenly distributed, the tab is easy to fall off due to low tensile strength, and the like in actual use.
The embodiment of the utility model provides a multilayer current collector tab, which is formed by a composite current collector structure, wherein the composite current collector structure comprises a first metal layer, a second metal layer and a support body arranged between the first metal layer and the second metal layer, the first metal layer and the second metal layer are oppositely arranged, each layer of current collector tab in the multilayer current collector tab respectively comprises at least one through hole, and each through hole contained in the multilayer current collector tab forms a filling area for filling a conductive part.
In some embodiments, the through holes included in any two layers of the multilayer current collector tabs are at least partially coincident.
In some embodiments, adjacent through holes included in adjacent layers of the multi-layer current collector tabs are partially overlapped.
In some embodiments, the shape and size of each through hole included in the multilayer current collector tab are the same.
In some embodiments, the shape of the through hole comprises at least one of: round, square, rectangular, triangular, oval.
In some embodiments, the conductive member is in compression fit with the multilayer current collector tab in the fill region.
In some embodiments, the contact area of the conductive component and each through hole included in the multilayer current collector tab is a welding area of the multilayer current collector tab.
In some embodiments, the conductive member has a length in a radial direction of the through hole that is the same as a thickness of the multilayer current collector tab.
In some embodiments, the multilayer current collector tab is formed from a composite current collector structure laminated or wound.
According to another aspect of the present utility model, there is provided a composite current collector structure including first and second metal layers disposed opposite to each other, and a support provided between the first and second metal layers, the composite current collector structure including a dressing region for applying an active material and a tab formation region for forming a multilayer current collector tab, the tab formation region being provided with a plurality of through holes arranged such that each of the multilayer current collector tabs formed by stacking or winding the composite current collector structure includes at least one of the through holes, and each of the through holes included in the multilayer current collector tab forms a filling region for filling a conductive member. Compared with the prior art, the utility model has the following advantages:
the multilayer current collector tab provided by the embodiment of the utility model is formed by a composite current collector structure, the composite current collector structure comprises a first metal layer, a second metal layer and a support body, the first metal layer and the second metal layer are oppositely arranged, the support body is arranged between the first metal layer and the second metal layer, each layer of current collector tab in the multilayer current collector tab respectively comprises at least one through hole, and each through hole contained in the multilayer current collector tab forms a filling area for filling a conductive part. Because each layer of current collector tab in the multilayer current collector tab comprises at least one through hole respectively, and each through hole that the multilayer current collector tab comprises forms the filling area that is used for filling conductive parts, consequently after filling conductive parts in this filling area, and can realize electric conduction between the metal layer of each layer of current collector tab after tab welding, avoid current because of compound current collector intermediate level is relative metal insulation's polymer and lead to tab welding back, both sides metal layer can't direct conduction, lead to appearing that the electric core internal resistance is partial big, current density distribution is inhomogeneous, lead to easily droing scheduling problem because of tab tensile strength is low when in actual use.
Drawings
Fig. 1 is a front view of a composite current collector structure provided by an embodiment of the present utility model;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1, provided by an embodiment of the present utility model;
FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1 provided by an embodiment of the present utility model;
fig. 4 is a side view of a multi-layered current collector tab provided by an embodiment of the present utility model after welding;
FIG. 5 is a cross-sectional view taken along line C-C of FIG. 4, in accordance with an embodiment of the present utility model.
The drawings are marked with the following description:
The first dressing layer 101, the second dressing layer 102, the first metal layer 201, the second metal layer 202, the support 401, and the conductive member 50.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than those herein described, and those skilled in the art will readily appreciate that the present utility model may be similarly embodied without departing from the spirit or essential characteristics thereof, and therefore the present utility model is not limited to the specific embodiments disclosed below.
The current collector is used as an important component in the ion battery, and has the function of collecting current generated by active substances of the ion battery to form larger external output current. The use of the composite current collector structure can further improve energy density, toughness and ductility, thereby realizing process optimization in production, and improving energy density per unit mass and safety. The middle of the composite current collector adopts a light polymer as a support body, and metal conductive layers are attached to two sides of the support body, so that the safety performance of battery extrusion, needling and the like can be effectively improved, and meanwhile, the weight of the current collector is reduced. However, in the composite current collector with the metal-polymer-metal structure, the middle layer is a polymer insulated from the metal, so that after the electrode lugs are welded, the metal layers on two sides cannot be directly conducted, and the problems of large internal resistance of a battery core, uneven current density distribution, easy falling off caused by low tensile strength of the electrode lugs and the like occur in actual use.
Aiming at the application scene of the composite current collector, in order to solve the problems that the prior art has large internal resistance of a battery cell, uneven current density distribution, easy falling off caused by low tensile strength of the electrode lug and the like caused by the fact that the metal layers on two sides cannot be directly conducted after the electrode lug is welded because the middle layer of the composite current collector is a polymer insulated relative to metal, the embodiment of the utility model provides a multilayer current collector electrode lug and a composite current collector structure, and the embodiment is understood by referring to fig. 1, 2, 3, 4 and 5, and fig. 1 is a front view of the composite current collector structure provided by the embodiment of the utility model; FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1, provided by an embodiment of the present utility model; FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1 provided by an embodiment of the present utility model; fig. 4 is a side view of a multi-layered current collector tab provided by an embodiment of the present utility model after welding; FIG. 5 is a cross-sectional view taken along line C-C of FIG. 4, in accordance with an embodiment of the present utility model.
The multilayer current collector tab provided in this embodiment is formed by stacking (corresponding to a stacked battery) or winding (corresponding to a wound battery) a composite current collector structure, as shown in fig. 1, 2 and 3, the composite current collector structure includes a first metal layer 201 and a second metal layer 202 that are disposed opposite to each other, and a support 401 that is disposed between the first metal layer 201 and the second metal layer 202, each layer of current collector tab in the multilayer current collector tab includes at least one through hole 30, and each through hole 30 included in the multilayer current collector tab forms a filling area for filling a conductive component. Because each layer of current collector tab in the multilayer current collector tab contains at least one through hole respectively, and each through hole that multilayer current collector tab contains forms the filling area that is used for filling conductive part, consequently after filling conductive part in this filling area, and can realize electric conduction between the metal level of each layer of current collector tab after the tab welding, promote the electric current convergence ability between the multilayer current collector tab, avoid current because of compound current collector intermediate level is relative metal insulation's polymer lead to tab welding back, both sides metal level can't direct switch on, and then lead to appearing that the electric core internal resistance is bigger, current density distribution is inhomogeneous, lead to easily droing scheduling problem because of tab tensile strength is low when using in fact.
The through holes may be any shape, for example, may be one or more of a circle, a square, a rectangle, a triangle, an ellipse, etc., and the shapes and sizes of the through holes between the current collector tabs of each layer may be the same or different, and each through hole may only need to satisfy the formation of a filling region for filling the conductive member. In this embodiment, in order to facilitate the processing of the through hole, the following is preferable: the shape and the size of each through hole contained in the multilayer current collector lug are the same.
In this embodiment, the material of the conductive member may be one or more of gold, tungsten, platinum, iron, cobalt, copper, nickel, magnesium, zinc, aluminum, titanium, and chromium, or a length of a composite organic material with conductivity along a radial direction of the through hole may be the same as a thickness of the multilayer current collector tab, so as to implement the conductive member and the multilayer current collector tab.
In this embodiment, through holes included in any two layers of current collector tabs in the multilayer current collector tabs at least partially overlap with each other. For example, the through hole distribution manner included in the current collector tab is: all through holes contained in all current collector lugs in the multilayer current collector lugs are overlapped, or all through holes contained in part of current collector lugs are overlapped, or all through holes contained in all current collector lugs are overlapped, and through the arrangement, the filling area formed by all through holes contained in the multilayer current collector lugs is in a through state, so that the conductive part can be filled conveniently.
In this embodiment, the preferred distribution manner of the through holes included in the current collector tabs of each layer is preferably: adjacent through holes included in adjacent layers of current collector lugs are partially overlapped along the radial direction of the through holes, namely, for any adjacent layer of current collector lugs, only part of through holes are overlapped along the axial direction of the current collector lugs, so that for one layer of current collector lugs, the non-overlapped part of the through holes is necessarily overlapped with non-through hole areas of the adjacent layer of current collector lugs, the overlapping mode can improve the tensile strength of the welded multi-layer current collector lugs on the basis of ensuring the current converging capacity between the multi-layer current collector lugs.
Further, on the basis of partial overlapping between adjacent through holes contained in adjacent layers of current collector tabs in the multi-layer current collector tab, through holes contained in separate layers of current collector tabs in the multi-layer current collector tab can be completely overlapped along the radial direction of the through holes, namely, for any adjacent layers of current collector tabs, the through holes of the current collector tabs are only partially overlapped, but the through holes contained in the separate layers of current collector tabs are completely overlapped, so that the cross overlapping between the through hole area and the non-through hole area of each layer of current collector tab is realized (as shown in fig. 5), and by the mode, the tensile strength of the welded multi-layer current collector tab can be further enhanced.
In this embodiment, the conductive member may be disposed in the filling area by grafting, and the conductive member and the multilayer current collector tab are pressed and bonded in the filling area. For example, the conductive member and the multilayer current collector tab are pre-welded by means of soldering, welding, pressure welding, ultrasonic welding, or the like, and the contact area of the conductive member and each through hole included in the multilayer current collector tab is a welding area. In this embodiment, the surface of the conductive member may be connected to the filling region of the multilayer current collector tab by means of conductive adhesive bonding or the like.
According to the multilayer current collector tab provided by the embodiment, each layer of current collector tab in the multilayer current collector tab respectively comprises at least one through hole, and each through hole included in the multilayer current collector tab forms a filling area for filling the conductive part, so that after the conductive part is filled in the filling area, and after the tab is welded, electrical conduction can be realized between metal layers of each layer of current collector tab, current collecting capacity between the multilayer current collector tabs is improved, the current collecting capacity of the multilayer current collector tabs is improved, the problems that the current core internal resistance is large, current density distribution is uneven, and the current is easy to fall off due to low tensile strength of the tab in actual use due to the fact that the metal layers on two sides cannot be directly conducted after the tab is welded due to the fact that the middle layer of the composite current collector is a polymer which is insulated relative to metal are avoided. And, the adjacent through holes that the adjacent layer current collector tab among the multilayer current collector tabs contains are partially overlapped along the radial direction of the through hole, can realize the overlapping between the through hole region and the non-through hole region of each layer current collector tab, and this kind of overlapping mode can strengthen the tensile strength after the welding of multilayer current collector tab on the basis of guaranteeing the electric current confluence ability between the multilayer current collector tab. Furthermore, through holes in the separated layer current collector lugs in the multi-layer current collector lugs can be completely overlapped along the radial direction of the through holes, so that the cross overlapping between the through hole areas and the non-through hole areas of each layer of current collector lugs can be realized, and the tensile strength of the welded multi-layer current collector lugs can be further enhanced.
Another embodiment of the present application provides a composite current collector structure including, as shown in fig. 1, 2 and 3, a first metal layer 201 and a second metal layer 202 disposed opposite to each other, and a support 401 disposed between the first metal layer and the second metal layer, the composite current collector structure including a dressing region 10 for applying an active material and a tab formation region 20 for forming a multilayer current collector tab, the dressing region 10 including a first dressing layer 101 and a second auxiliary dressing layer 102, the tab formation region 20 being provided with a plurality of through holes 30 penetrating the first metal layer 201, the support 401 and the second metal layer 202, the plurality of through holes 30 being disposed such that each of the multilayer current collector tabs formed by lamination or winding of the composite current collector structure includes at least one of the through holes, and each of the through holes included in the multilayer current collector tab forms a filling region for filling a conductive member. For the content, please refer to the above embodiments, and the description thereof is omitted herein.
It should be noted that while the above describes exemplifying embodiments of the utility model, there are several different embodiments of the utility model, which are intended to be illustrative, and that the scope of the utility model is defined by the appended claims.
Claims (10)
1. The multilayer current collector tab is formed by a composite current collector structure comprising a first metal layer and a second metal layer which are oppositely arranged, and a support body arranged between the first metal layer and the second metal layer.
2. The multilayer current collector tab of claim 1, wherein the through holes contained in any two of the multilayer current collector tabs are at least partially coincident.
3. The multilayer current collector tab of claim 1, wherein adjacent through holes comprised by adjacent layers of current collector tabs in the multilayer current collector tab are partially coincident.
4. A multilayer current collector tab according to any of claims 1-3, wherein each of the through holes contained in the multilayer current collector tab is the same shape and size.
5. The multilayer current collector tab of claim 1, wherein the shape of the through hole comprises at least one of: round, square, rectangular, triangular, oval.
6. The multilayer current collector tab of claim 1 wherein the conductive member is in compression fit with the multilayer current collector tab in the fill area.
7. The multilayer current collector tab of claim 1, wherein the contact area of the conductive member with each of the through holes contained in the multilayer current collector tab is a welded area of the multilayer current collector tab.
8. The multilayer current collector tab of claim 1, wherein a length of the conductive member in a radial direction of the through hole is the same as a thickness of the multilayer current collector tab.
9. The multilayer current collector tab of claim 1, wherein the multilayer current collector tab is formed from a composite current collector structure comprising: the multilayer current collector tab is formed by laminating or winding a composite current collector structure.
10. A composite current collector structure comprising first and second metal layers disposed opposite to each other, and a support body disposed between the first and second metal layers, characterized in that the composite current collector structure comprises a dressing region for applying an active material and a tab formation region for forming a multilayer current collector tab, the tab formation region being provided with a plurality of through holes disposed such that each of the multilayer current collector tabs formed by laminating or winding the composite current collector structure contains at least one of the through holes, respectively, and each of the through holes contained in the multilayer current collector tab forms a filling region for filling a conductive member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223310743.8U CN219067165U (en) | 2022-12-09 | 2022-12-09 | Multilayer current collector tab and composite current collector structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223310743.8U CN219067165U (en) | 2022-12-09 | 2022-12-09 | Multilayer current collector tab and composite current collector structure |
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| Publication Number | Publication Date |
|---|---|
| CN219067165U true CN219067165U (en) | 2023-05-23 |
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| CN202223310743.8U Active CN219067165U (en) | 2022-12-09 | 2022-12-09 | Multilayer current collector tab and composite current collector structure |
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- 2022-12-09 CN CN202223310743.8U patent/CN219067165U/en active Active
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