CN219779156U - Composite current collector tab connection structure - Google Patents
Composite current collector tab connection structure Download PDFInfo
- Publication number
- CN219779156U CN219779156U CN202321197987.1U CN202321197987U CN219779156U CN 219779156 U CN219779156 U CN 219779156U CN 202321197987 U CN202321197987 U CN 202321197987U CN 219779156 U CN219779156 U CN 219779156U
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- CN
- China
- Prior art keywords
- current collector
- composite current
- collector layer
- metal foil
- layer
- Prior art date
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- 239000002131 composite material Substances 0.000 title claims abstract description 118
- 229910052751 metal Inorganic materials 0.000 claims abstract description 79
- 239000002184 metal Substances 0.000 claims abstract description 79
- 239000011888 foil Substances 0.000 claims abstract description 72
- 229920000642 polymer Polymers 0.000 claims abstract description 14
- 238000005452 bending Methods 0.000 claims abstract description 9
- 238000003466 welding Methods 0.000 claims abstract description 5
- 150000001875 compounds Chemical class 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract 1
- 229910052744 lithium Inorganic materials 0.000 abstract 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 8
- 239000010949 copper Substances 0.000 description 5
- 239000004642 Polyimide Substances 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000011889 copper foil Substances 0.000 description 4
- -1 polyethylene terephthalate Polymers 0.000 description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 description 4
- 239000005020 polyethylene terephthalate Substances 0.000 description 4
- 229920001721 polyimide Polymers 0.000 description 4
- 229920001155 polypropylene Polymers 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 229910052738 indium Inorganic materials 0.000 description 2
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002861 polymer material Substances 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910052718 tin Inorganic materials 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
Landscapes
- Cell Electrode Carriers And Collectors (AREA)
Abstract
The utility model discloses a composite current collector tab connection structure, which belongs to the technical field of lithium batteries and comprises the following components: at least one composite current collector layer comprising a polymer layer and metal layers attached to both sides of the polymer layer; the strip-shaped metal foil is smaller than the length of the composite current collector layer in width, and is folded along the length direction to form bending areas, one composite current collector layer is placed in each bending area, the composite current collector layer is connected with the metal foil in a welding mode, and the metal foil is provided with an area exceeding the composite current collector layer as a conductive area; the conductive area is used as a tab, or the connecting structure further comprises a tab, and the tab is connected with the conductive area on the metal foil. The composite current collector tab connection structure has high conductivity, simple process structure and suitability for mass production.
Description
Technical Field
The utility model relates to the technical field of battery manufacturing, in particular to a composite current collector lug connection structure.
Background
The composite current collector technology is a sandwich structure, wherein the inner layer is a polymer layer, and the two sides are metal layers. The metal layer of the composite current collector is only about 1um, and can be quickly melted when in thermal runaway to form an 'open circuit effect', and the base material of the middle layer is an insulating layer, so that the short circuit of the anode and the cathode can be effectively prevented, and if in the needling process, the composite current collector is directly disconnected, so that the short circuit point is avoided, and the safety performance is improved. The middle layer of the composite current collector is made of a polymer material with smaller density, and can effectively reduce the weight of the current collector (by 50% -80% compared with a pure metal foil), thereby improving the mass energy density by 5% -10%. The composite current collector adopts a polymer material which is cheaper than metal Al/Cu, has lower density and lighter weight, and can reduce the cost of the current collector by more than 60 percent from the viewpoint of the cost of pure materials.
In conclusion, the composite current collector has the advantages of high safety, high specific energy, low cost and the like, and is a hot spot for the research of the current lithium ion battery. However, since the middle layer is an insulating layer and the metal layer is thin, the tab of the composite current collector is difficult to lead out. In the patent document of application number 202220827967.7, a composite current collector welding structure is provided, however, the middle of each composite current collector layer is equivalent to folding 2 layers of metal foils, the overall thickness is increased, and the volumetric energy density of the battery is reduced although a tab welding thought is provided.
In view of the above, the utility model provides a composite current collector tab connection structure which has the advantages of high conductivity, simple process structure, suitability for mass production and the like.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art and provides a novel composite collector tab connection structure with simple structure and high conductivity.
The aim of the utility model can be achieved by the following technical scheme.
The utility model provides a compound current collector utmost point ear connection structure which characterized in that, compound current collector utmost point ear connection structure includes:
at least one composite current collector layer comprising a polymer layer and metal layers attached to both sides of the polymer layer;
the strip-shaped metal foil is smaller than the length of the composite current collector layer in width and provided with bending areas formed by folding along the length direction, each bending area is provided with one composite current collector layer, the composite current collector layer is welded with the metal foil, and the metal foil is provided with an area exceeding the composite current collector layer as a conductive area;
the conductive area is used as a tab, or the composite current collector tab connection structure further comprises a tab, and the tab is connected with the conductive area on the metal foil.
Optionally, the polymer layer in the composite current collector layer is one of polyethylene terephthalate (PET), polypropylene (PP), and Polyimide (PI).
Optionally, the polymer layer in the composite current collector layer has a thickness in the range of 2 μm to 6 μm
Optionally, the metal layer in the composite current collector layer is one of copper, aluminum, silver, tin and indium, preferably copper or aluminum.
Optionally, the thickness of the metal layer in the composite current collector layer is in the range of 0.5 μm to 2 μm.
Optionally, the metal foil is one of copper foil, aluminum foil, stainless steel foil and nickel foil, preferably copper foil or aluminum foil.
Optionally, the metal foil has a thickness of 1-10 μm.
Optionally, the metal foil is located at one end of the composite current collector layer, and the metal foil has a conductive region at the end beyond the composite current collector layer.
Optionally, the metal foil is located at one end of the composite current collector layer, and has a conductive area beyond the composite current collector layer in the width direction of the composite current collector layer.
Optionally, the metal foil is located in the middle of the composite current collector layer, and the metal foil is provided with a conductive area exceeding the composite current collector layer in the width direction of the composite current collector layer.
Optionally, the conductive region of the metal foil serves as a tab.
The technical scheme of the utility model has at least one of the following advantages:
1. the process has simple structure and is suitable for mass production;
2. each composite current collector layer is connected with a metal foil and has the characteristic of high conductivity;
3. only one layer of metal foil is arranged between the adjacent composite current collector layers, the overall thickness is thinner, and the volume energy density is higher.
Drawings
Fig. 1 is a schematic representation of one embodiment of the present utility model with tabs drawn from the ends of a composite current collector.
Fig. 2 is a schematic view of an embodiment of the present utility model in which the tab is drawn from the left side of the composite current collector.
Fig. 3 is a schematic view of an embodiment of the present utility model in which the tab is led from the right side of the composite current collector.
Fig. 4 is a schematic view of one embodiment of the present utility model with tabs drawn from the middle of the composite current collector.
Description of the figure:
10 composite current collector layer 11 Polymer layer 12 Metal layer 20 Metal foil
Electrode lug with 21 welding area 22, conductive area 23, bending area 30
Detailed Description
The following describes specific embodiments of the present utility model. The terms "left", "right", "width", "length", and the like, as described in this document are for the purpose of a clearer description, and it should be understood that other various embodiments can be envisaged and modifications thereof by those skilled in the art according to the teachings of the present disclosure without departing from the scope or spirit of the present utility model. The following detailed description is, therefore, not to be taken in a limiting sense.
Referring to fig. 1 to 4, the composite collector tab connection structure includes:
a composite current collector layer 10, wherein the composite current collector layer 10 comprises a polymer layer 11 and metal layers 12 attached to two sides of the polymer layer 11;
the width of the metal foil 20 is smaller than the length of the composite current collector layer 10, the metal foils 20 are stacked in a 'shape', each bending area 23 is provided with the composite current collector layer 10, the composite current collector layer 10 is welded with the metal foil 20, and the metal foil 20 is provided with an area exceeding the composite current collector layer 10 as a conductive area 22;
a tab 30, the tab 30 being connected to the conductive region 22 on the metal foil 20.
Optionally, the polymer layer in the composite current collector layer 10 is one of polyethylene terephthalate (PET), polypropylene (PP), and Polyimide (PI).
Optionally, the metal layer 12 in the composite current collector layer 10 is one of copper, aluminum, silver, tin, and indium, preferably copper or aluminum.
Optionally, the metal foil 20 is one of copper foil, aluminum foil, stainless steel foil, nickel foil, preferably copper foil or aluminum foil.
Alternatively, the metal foil 20 has a thickness of 1-10 μm.
Optionally, the metal foil 20 is located at one end of the composite current collector layer 10, and the metal foil 20 has a conductive region 22 at the end beyond the composite current collector layer 10.
Optionally, the metal foil 20 is located at one end of the composite current collector layer 10, and has a conductive region 22 extending beyond the composite current collector layer 10 in the width direction of the composite current collector layer 10.
Optionally, the metal foil 20 is located in the middle of the composite current collector layer 10, and has a conductive area 22 extending beyond the composite current collector layer 10 in the width direction of the composite current collector layer 10.
As shown in fig. 1, one embodiment of the present utility model is shown with tabs drawn from the ends of a composite current collector. The metal foil 20 is located at one end of the composite current collector layer 10 in the length direction, and a part of the metal foil 20 is provided with a conductive area 22 which is not overlapped with the composite current collector layer 10; the width of the metal foil 20 after bending is equivalent to the width of the composite current collector layer 10 or slightly larger than the width of the current collector layer 10 in the width direction. The portion where the metal foil 20 overlaps the composite current collector layer 10 is a welded area 21, and the metal foil 20 and the composite current collector layer 10 are welded to each other within the range of the welded area 21. The conductive region 22 on the metal foil 20 may be directly used as the tab 30, or the tab 30 may be welded on the conductive region 22.
Fig. 2 shows a schematic view of an embodiment of the lead tab of the present utility model from the left side of the composite current collector. The metal foil 20 is positioned at one end of the composite current collector layer 10 in the length direction, and the edge of the metal foil 20 is aligned with the edge of the composite current collector layer 10 in the length direction of the composite current collector layer 10; in the width direction of the composite current collector layer 10, the metal foil 20 has a portion extending out of the conductive region 22 of the composite current collector layer 10 at the left side of the composite current collector layer 10. The portion where the metal foil 20 overlaps the composite current collector layer 10 is a welded area 21, and the metal foil 20 and the composite current collector layer 10 are welded to each other within the range of the welded area 21. The conductive region 22 on the metal foil 20 may be directly used as the tab 30, or the tab 30 may be welded on the conductive region 22.
As shown in fig. 3, one embodiment of the present utility model is shown with a tab drawn from the right side of the composite current collector. The metal foil 20 is positioned at one end of the composite current collector layer 10 in the length direction, and the edge of the metal foil 20 is aligned with the edge of the composite current collector layer 10 in the length direction of the composite current collector layer 10; in the width direction of the composite current collector layer 10, the metal foil 20 has a portion extending beyond the conductive region 22 of the composite current collector layer 10 on the right side of the composite current collector layer 10. The portion where the metal foil 20 overlaps the composite current collector layer 10 is a welded area 21, and the metal foil 20 and the composite current collector layer 10 are welded to each other within the range of the welded area 21. The conductive region 22 on the metal foil 20 may be directly used as the tab 30, or the tab 30 may be welded on the conductive region 22.
As shown in fig. 4, one embodiment of the present utility model is shown with tabs drawn from the middle of the composite current collector. The metal foil 20 is located at the opposite middle part of the length direction of the composite current collector layer 10, i.e., in the length direction of the composite current collector layer 10, both sides of the metal foil 20 are provided with the composite current collector layer 10 beyond the boundary of the metal foil 20; the metal foil 20 has a portion extending out of the conductive region 22 of the composite current collector layer 10 in the width direction of the composite current collector layer 10, and the conductive region 22 may be located on the left or right side of the composite current collector layer 10. The portion where the metal foil 20 overlaps the composite current collector layer 10 is a welded area 21, and the metal foil 20 and the composite current collector layer 10 are welded to each other within the range of the welded area 21. The conductive region 22 on the metal foil 20 may be directly used as the tab 30, or the tab 30 may be welded on the conductive region 22.
Although the present utility model has been disclosed above, the present utility model is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the utility model, and the scope of the utility model should be assessed accordingly to that of the appended claims.
Claims (7)
1. The utility model provides a compound current collector utmost point ear connection structure which characterized in that, compound current collector utmost point ear connection structure includes:
at least one composite current collector layer comprising a polymer layer and metal layers attached to both sides of the polymer layer; and
the strip-shaped metal foil is smaller than the length of the composite current collector layer in width and provided with bending areas formed by folding along the length direction, each bending area is provided with one composite current collector layer, the composite current collector layer is connected with the metal foil in a welding way, and the metal foil is provided with an area exceeding the composite current collector layer as a conductive area;
the conductive area is used as a tab, or the composite current collector tab connection structure further comprises a tab, and the tab is connected with the conductive area on the metal foil.
2. The composite current collector tab connection structure of claim 1, wherein a thickness of the polymer layer in the composite current collector layer is in a range of 2 μm to 6 μm.
3. The composite current collector tab connection structure of claim 1, wherein a thickness of the metal layer in the composite current collector layer is in a range of 0.5 μm to 2 μm.
4. The composite collector tab connection structure of claim 1 wherein the metal foil has a thickness of 1-10 μm.
5. The composite current collector tab connection structure of claim 1 wherein the metal foil is located at one end of the composite current collector layer and the metal foil has a conductive region at the end beyond the composite current collector layer.
6. The composite current collector tab connection structure of claim 1 wherein the metal foil is located at one end of the composite current collector layer and has a conductive area extending beyond the composite current collector layer in a width direction of the composite current collector layer.
7. The composite current collector tab connection structure of claim 1 wherein the metal foil is positioned in the middle of the composite current collector layer and has a conductive area extending beyond the composite current collector layer in the width direction of the composite current collector layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321197987.1U CN219779156U (en) | 2023-05-17 | 2023-05-17 | Composite current collector tab connection structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321197987.1U CN219779156U (en) | 2023-05-17 | 2023-05-17 | Composite current collector tab connection structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219779156U true CN219779156U (en) | 2023-09-29 |
Family
ID=88102498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321197987.1U Active CN219779156U (en) | 2023-05-17 | 2023-05-17 | Composite current collector tab connection structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219779156U (en) |
-
2023
- 2023-05-17 CN CN202321197987.1U patent/CN219779156U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant |