Composite current collector structure and lithium ion battery
By dividing the conductive layer into the plating area and the division area in the composite fluid structure, and alternating the setting, the short -circuit problem caused by the burr during division is solved, and the normal work of the lithium -ion battery is ensured.
Patent Information
- Application Number
- CN202421073916.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-16
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-05-16
AI Technical Summary
During the production process of composite fluid collection, the burrs generated during slitting will cause contact between the positive electrode conductive layer and the negative electrode conductive layer, resulting in a short circuit, affecting the working performance of the lithium-ion battery.
Design a composite fluid structure. Among them, the conductive layer of the two surfaces of the insulating membrane layer is divided into plating zone and cutting zone, and alternately set. So as to reduce the emergence of short circuit conditions.
Through this structural design, the emergence of short -circuit conditions is reduced, and the normal working performance of lithium ion batteries is guaranteed.
Smart Images
Figure CN222421993U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of lithium ion battery production, and specifically relates to a composite current collector structure and a lithium ion battery. Background Art
[0002] The current collector is an important component of lithium-ion batteries. Its main function is to carry the electrode materials of the positive and negative electrodes, collect current and conduct electrons at the same time. The composite current collector is composed of a multi-layer structure. Due to its high safety and good conductivity, it has become the most promising new current collector material for lithium-ion batteries.
[0003] During the production process of the composite current collector, the composite current collector needs to be cut. Since burrs are generated during the cutting, the burrs may cause the positive electrode conductive layer and the negative electrode conductive layer to contact and cause a short circuit, thereby affecting the working performance of the lithium-ion battery.
[0004] Therefore, a composite current collector structure and a lithium-ion battery are designed to solve the above problems.
[0005] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the utility model and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because these solutions are described in the background technology section of the utility model. Utility Model Content
[0006] In order to overcome the above-mentioned deficiencies in the prior art, the purpose of the utility model is to provide a composite current collector structure and a lithium ion battery.
[0007] In order to achieve the above purpose and other related purposes, the technical solution provided by the utility model is: a composite current collector structure, comprising: an insulating film layer, wherein the two surfaces of the insulating film layer are respectively provided with a positive electrode conductive layer and a negative electrode conductive layer; the positive electrode conductive layer comprises a first coating area and a first cutting area which are alternately arranged; the negative electrode conductive layer comprises a second coating area and a second cutting area which are alternately arranged; the first coating area is arranged corresponding to the first cutting area, and the second coating area is arranged corresponding to the second cutting area. In this solution, the conductive layers on the two surfaces of the insulating film layer are divided into a coating area and a cutting area, and the coating area and the cutting area are alternately arranged, and the cutting of the composite current collector can be carried out directly in the cutting area to avoid contact between the first coating area and the second coating area, thereby reducing the occurrence of short circuits and ensuring the normal operation of lithium-ion batteries.
[0008] Furthermore, the first coating area and the first cutting area are alternately arranged along the length direction of the composite current collector; the second coating area and the second cutting area are alternately arranged along the length direction of the composite current collector. In this solution, the coating area and the cutting area are alternately arranged along the length direction, which is convenient for the production and processing of the composite current collector.
[0009] Furthermore, the width of the first coating area is equal to the width of the second coating area, and the width of the first slitting area is equal to the width of the second slitting area. In this solution, the width of the coating area is equal to the width of the slitting area at the corresponding position, which can better avoid short circuit between positive and negative electrodes.
[0010] Furthermore, along the length direction of the composite current collector, the difference in width between the first cutting area and the first coating area is 3 to 18 mm; the difference in width between the second cutting area and the second coating area is 3 to 18 mm. In this solution, the width difference can effectively avoid short circuits between the positive and negative electrodes, and can ensure the area of the metal layer for connection of the tabs.
[0011] Furthermore, the width of the first cutting area and the width of the second cutting area are both 2 to 3 cm. In this solution, the width of the first cutting area is 2 cm, 2.5 cm or 3 cm; the width of the second cutting area is 2 cm, 2.5 cm or 3 cm.
[0012] Furthermore, the coating thickness of the first coating area is 0.5-18 μm; the coating thickness of the second coating area is 0.5-18 μm. In this solution, the coating thickness of the first coating area is 0.5 μm, 12 μm or 18 μm; the coating thickness of the second coating area is 0.5 μm, 12 μm or 18 μm.
[0013] Furthermore, the thickness of the insulating film layer is 1.5-90 μm. In this solution, the thickness of the insulating film layer is 1.5 μm, 50 μm or 90 μm.
[0014] Furthermore, the coating thickness of the first cutting area is less than the coating thickness of the first coating area; the coating thickness of the second cutting area is less than the coating thickness of the second coating area. In this solution, the coating thickness of the cutting area is set to be less than the coating thickness of the coating area, and when the composite current collector is cut, the burrs will be reduced, reducing the contact between the positive electrode conductive layer and the negative electrode conductive layer, thereby further reducing the occurrence of short circuits.
[0015] Furthermore, in the first cutting area and the second cutting area, at least one of the cutting areas has a coating thickness of 0. In this solution, in the two-sided conductive layer, at least one of the cutting areas has no coating, which further reduces the generation of burrs during cutting, reduces the contact between the positive conductive layer and the negative conductive layer, and reduces the occurrence of short circuits.
[0016] The utility model also provides a lithium ion battery, which comprises the composite current collector structure described in any one of the above technical solutions.
[0017] Due to the application of the above technical solution, the utility model has the following beneficial effects compared with the prior art:
[0018] The composite current collector structure designed by the utility model divides the conductive layers on both surfaces of the insulating film layer into a coating area and a cutting area, and the coating area and the cutting area are alternately arranged. The cutting of the composite current collector can be directly performed in the cutting area to avoid contact between the first coating area and the second coating area, thereby reducing the occurrence of short circuits and ensuring the normal operation of the lithium-ion battery. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of the cross-sectional structure of the composite current collector of the utility model;
[0020] In the above figures, 1, insulating film layer; 2, positive electrode conductive layer; 21, first plating area; 22, first cutting area; 3, negative electrode conductive layer; 31, second plating area; 32, second cutting area. DETAILED DESCRIPTION
[0021] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.
[0022] It should be noted that in the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use, which are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. Terms such as "horizontal", "vertical", and "overhanging" do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0023] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, it can be an electrical connection, it can be a direct connection, it can be indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0024] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.
[0025] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.
[0026] Embodiment 1: See attached Figure 1 As shown, this embodiment provides a composite current collector structure, including: an insulating film layer 1, and a positive electrode conductive layer 2 and a negative electrode conductive layer 3 are respectively arranged on the two surfaces of the insulating film layer 1; the positive electrode conductive layer 2 includes a first plating area 21 and a first cutting area 22 arranged alternately; the negative electrode conductive layer 3 includes a second plating area 31 and a second cutting area 32 arranged alternately; the first plating area 21 is arranged correspondingly to the first cutting area 22, and the second plating area 31 is arranged correspondingly to the second cutting area 32. Among them, the metal materials of the positive electrode conductive layer 2 and the negative electrode conductive layer 3 are different.
[0027] In this embodiment, the conductive layers on both surfaces of the insulating film layer 1 are divided into a coating area and a cutting area, and the coating area and the cutting area are alternately arranged. The cutting of the composite current collector can be carried out directly in the cutting area to avoid contact between the first coating area 21 and the second coating area 31, thereby reducing the occurrence of short circuits and ensuring the normal operation of the lithium-ion battery.
[0028] Embodiment 2: See attached Figure 1As shown, this embodiment is a further improvement on the basis of the first embodiment, and its specific method is: the first coating area 21 and the first cutting area 22 are alternately arranged along the length direction of the composite current collector; the second coating area 31 and the second cutting area 32 are alternately arranged along the length direction of the composite current collector. In this embodiment, the coating area and the cutting area are alternately arranged along the length direction, which is convenient for the production and processing of the composite current collector.
[0029] Embodiment 3: See attached Figure 1 As shown, this embodiment is a further improvement on the basis of the second embodiment, and its specific method is: the width of the first coating area 21 is equal to the width of the second coating area 31, and the width of the first cutting area 22 is equal to the width of the second cutting area 32. In this embodiment, the width of the coating area is equal to the width of the cutting area at the corresponding position, which can better avoid the positive and negative short circuit.
[0030] Embodiment 4: Not shown in the drawings, this embodiment is a further improvement on the basis of Embodiment 2, and its specific method is as follows: along the length direction of the composite current collector, the difference in width between the first cutting area 22 and the first coating area 21 is 3 to 18 mm; the difference in width between the second cutting area 32 and the second coating area 31 is 3 to 18 mm. In this embodiment, the width difference can effectively avoid short circuit between the positive and negative electrodes, and can ensure the area of the metal layer for connection of the tabs.
[0031] Embodiment 5: Not shown in the drawings, this embodiment is a further improvement on the basis of Embodiment 1, and its specific method is as follows: the width of the first cutting area 22 and the width of the second cutting area 32 are both 2 to 3 cm. Among them, the width of the first cutting area 22 is 2 cm, 2.5 cm or 3 cm; the width of the second cutting area 32 is 2 cm, 2.5 cm or 3 cm.
[0032] Embodiment 6: Not shown in the drawings, this embodiment is a further improvement on the basis of Embodiment 1, and its specific method is as follows: the coating thickness of the first coating area 21 is 0.5-18 μm; the coating thickness of the second coating area 31 is 0.5-18 μm. Among them, the coating thickness of the first coating area 21 is 0.5 μm, 12 μm or 18 μm; the coating thickness of the second coating area 31 is 0.5 μm, 12 μm or 18 μm.
[0033] Embodiment 7: Not shown in the drawings, this embodiment is a further improvement on the embodiment 1, and its specific method is: the thickness of the insulating film layer 1 is 1.5-90 μm. The thickness of the insulating film layer 1 is 1.5 μm, 50 μm or 90 μm.
[0034] Embodiment 8: See attached Figure 1As shown, this embodiment is a further improvement on the basis of the first embodiment, and its specific manner is: the coating thickness of the first cutting area 22 is less than the coating thickness of the first coating area 21; the coating thickness of the second cutting area 32 is greater than the coating thickness of the second coating area 31. In this embodiment, the coating thickness of the cutting area is set to be less than the coating thickness of the coating area, and when the composite current collector is cut, the burrs will be reduced, reducing the contact between the positive electrode conductive layer 2 and the negative electrode conductive layer 3, thereby further reducing the occurrence of short circuits.
[0035] Embodiment 9: Not shown in the drawings, this embodiment is a further improvement on the basis of Embodiment 8, and its specific method is as follows: in the first cutting area 22 and the second cutting area 32, at least one of the cutting areas has a coating thickness of 0. In this embodiment, in the two-sided conductive layer, at least one of the cutting areas has no coating, which further reduces the generation of burrs during cutting, reduces the contact between the positive conductive layer 2 and the negative conductive layer 3, and reduces the occurrence of short circuits.
[0036] Embodiment 10: A lithium-ion battery, the lithium-ion battery comprising the composite current collector structure of any one of the above embodiments 1 to 9.
[0037] The composite current collector structure designed by the utility model divides the conductive layers on both surfaces of the insulating film layer into a coating area and a cutting area, and the coating area and the cutting area are alternately arranged. The cutting of the composite current collector can be directly performed in the cutting area to avoid contact between the first coating area and the second coating area, thereby reducing the occurrence of short circuits and ensuring the normal operation of the lithium-ion battery.
[0038] The above implementation modes are only for illustrating the technical concept and features of the utility model, and their purpose is to allow people familiar with this technology to understand the content of the utility model and implement it. It cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.
Claims
1. A composite current collector structure, characterized in that: include: An insulating film layer (1), wherein two surfaces of the insulating film layer (1) are respectively provided with a positive electrode conductive layer (2) and a negative electrode conductive layer (3); the positive electrode conductive layer (2) comprises a first plating area (21) and a first cutting area (22) which are alternately arranged; and the negative electrode conductive layer (3) comprises a second plating area (31) and a second cutting area (32) which are alternately arranged; The first coating area (21) is arranged correspondingly to the first cutting area (22), and the second coating area (31) is arranged correspondingly to the second cutting area (32).
2. A composite current collector structure according to claim 1, characterized in that: The first coating area (21) and the first cutting area (22) are alternately arranged along the length direction of the composite current collector; and the second coating area (31) and the second cutting area (32) are alternately arranged along the length direction of the composite current collector.
3. A composite current collector structure according to claim 2, characterized in that: The width of the first coating area (21) is equal to the width of the second coating area (31), and the width of the first cutting area (22) is equal to the width of the second cutting area (32).
4. A composite current collector structure according to claim 2, characterized in that: Along the length direction of the composite current collector, the difference in width between the first cutting area (22) and the first coating area (21) is 3 to 18 mm; the difference in width between the second cutting area (32) and the second coating area (31) is 3 to 18 mm.
5. A composite current collector structure according to claim 1, characterized in that: The width of the first cutting area (22) and the width of the second cutting area (32) are both 2 to 3 cm.
6. A composite current collector structure according to claim 1, characterized in that: The coating thickness of the first coating area (21) is 0.5 to 18 μm; the coating thickness of the second coating area (31) is 0.5 to 18 μm.
7. A composite current collector structure according to claim 1, characterized in that: The thickness of the insulating film layer (1) is 1.5 to 90 μm.
8. A composite current collector structure according to claim 1, characterized in that: The coating thickness of the first slitting area (22) is smaller than the coating thickness of the first coating area (21); and the coating thickness of the second slitting area (32) is smaller than the coating thickness of the second coating area (31).
9. A composite current collector structure according to claim 1, characterized in that: At least one of the first cutting area (22) and the second cutting area (32) has a coating thickness of 0.
10. A lithium ion battery, characterized in that: The lithium-ion battery comprises the composite current collector structure according to any one of claims 1 to 9.