Hot press forming device for groove on surface of composite current collector

Abstract

The utility model discloses a hot press forming device for a groove on the surface of a composite current collector, which comprises a furnace body, an unwinding roller arranged at the feed port and a winding roller arranged at the discharge port, wherein one end of the furnace body is provided with a feed port, and the other end of the furnace body is provided with a discharge port; the middle section and the rear section in the furnace body are provided with at least one group of rolling components; heating pipes for heating the composite current collector are arranged at the front section, the middle section and the rear section in the furnace body; the passing rollers are arranged in the advancing direction of the composite current collector; the device further comprises a supporting part for supporting the passing roller, the unwinding roller and the winding roller, by means of the device, rolling machining can be conveniently and rapidly conducted on the grooves in the surface of the composite current collector, and support is provided for the improved machining technology of the composite current collector.

Description

Technical Field

[0001] The utility model relates to a groove hot pressing forming device for the surface of a composite current collector. Background Art

[0002] Aluminum foil and copper foil are respectively the main positive and negative current collectors of lithium-ion batteries at present. They have good electrical conductivity, light weight, low cost, and the passivation layer on their surfaces can avoid the corrosion of the electrolyte during charge and discharge.

[0003] Combined with Figure 4 Introduce the R & D background of this application. Refer to Figure 4 , for the structure of the composite current collector 7 before improvement, which is coated with metal coatings 72 (i.e., aluminum foil or copper foil) for the positive and negative electrodes on the upper and lower surfaces of the flexible substrate 71 respectively. Since the surface of the flexible substrate 71 is smooth, it is easy for the material to fall off during coating, and the adhesion of the coating is not good, resulting in the peeling problem after the battery goes through multiple cycles.

[0004] Therefore, in order to improve the adhesion, the surface of the flexible substrate is first modified to improve the adhesion of the positive and negative current collectors. The method adopted refers to Chinese Patent 2022204116651. By processing the pattern on the surface of the polymer film (i.e., the flexible substrate), and then forming a connection layer on the polymer surface with different patterns, the adhesion between the conductive layer and the connection layer is greatly enhanced, ensuring the adhesion of the electrode material to the current collector.

[0005] The surface treatment method etches three-dimensional morphologies with different apparent structures on the surface of the flexible substrate through chemical oxidation. The three-dimensional morphology of the apparent structure on the surface of the flexible substrate after this treatment is uncontrollable and the overall uniformity is poor.

[0006] To solve this deficiency, the applicant adds a rolling process to the composite current collector after the current production process is completed, and develops a machine for deep processing the current collector to change the surface morphology of the composite current collector. The surface pattern of the composite current collector after deep processing has the advantages of good uniformity and easy control. Summary of the Utility Model

[0007] The purpose of the utility model is to provide a groove hot pressing forming device for the surface of a composite current collector to solve the above problems.

[0008] The technical solution adopted by the utility model is: a groove hot pressing forming device for the surface of a composite current collector, including a furnace body, one end of the furnace body is provided with a feeding port, the other end is provided with a discharging port, a unwinding roller arranged at the feeding port and a winding roller arranged at the discharging port;

[0009] At least one set of rolling assemblies is arranged in the middle and rear sections inside the furnace body;

[0010] Heating tubes for heating the composite current collector are arranged at the front, middle and rear sections inside the furnace body;

[0011] and a plurality of rollers arranged along the traveling direction of the composite current collector;

[0012] It also includes a supporting component for supporting the passing roller, the unwinding roller and the winding roller.

[0013] Further, the rolling assembly includes a main roller and an auxiliary roller;

[0014] The outer circumferential surfaces of the main roller and the auxiliary roller are both provided with protrusions for processing the outer surface texture of the composite current collector.

[0015] Furthermore, the main roller includes an inner tube body heated by oil temperature and an outer ring mold body containing the protrusions, and the outer ring mold body is sleeved on the outer side of the inner tube body.

[0016] Beneficial effects:

[0017] By adopting the device, the grooves on the surface of the composite current collector can be rolled quickly and conveniently, providing support for the processing technology of the improved composite current collector. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figures 2 to 3 This is a structural diagram of a roller pressing assembly of the utility model;

[0020] Figure 4 This is a diagram of the composite current collector structure before improvement;

[0021] Figure 5 This is a diagram of the improved composite current collector structure;

[0022] in:

[0023] 1-furnace body, 2-winding roller, 3-passing roller, 4-rolling assembly, 5-unwinding roller, 6-heating tube, 7-composite current collector;

[0024] 41-main roller, 42-auxiliary roller;

[0025] 411-inner tube body, 412-outer ring mold body;

[0026] 71- flexible substrate, 72- metal coating. DETAILED DESCRIPTION

[0027] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0028] See also Figure 1 And refer to Figure 5 , a device for hot pressing and forming grooves on the surface of a composite current collector, comprising a furnace body 1, wherein one end of the furnace body 1 is provided with a feed port, the other end of the furnace body 1 is provided with a discharge port, and a unwinding roller 5 arranged at the feed port and a winding roller 2 arranged at the discharge port;

[0029] Two groups of roller pressing assemblies 4 are provided in the middle and rear sections of the furnace body 1, and the two groups of roller pressing assemblies 4 are arranged one above the other;

[0030] The front, middle and rear sections of the furnace body 1 are provided with heating tubes 6 for heating the composite current collector, and the heating temperature is set within the thermal deformation temperature range of the flexible substrate, which is about 100 degrees Celsius;

[0031] and a plurality of rollers 3 arranged along the traveling direction of the composite current collector. The arrangement of the rollers 3 is shown in the figure. Rollers 3 are also arranged on the outside of the furnace body to facilitate entering and exiting the furnace body 1;

[0032] It also includes supporting components for supporting the passing roller 3, the unwinding roller 5 and the winding roller 2, which are not drawn in the figure. The provision of this device can conveniently and quickly perform roller pressing on the grooves on the surface of the composite current collector, providing support for the improved processing technology of the composite current collector.

[0033] See also Figure 2 , the rolling assembly 4 includes a main roller 41 and an auxiliary roller 42;

[0034] The outer circumferences of the main roller 41 and the auxiliary roller 42 are both provided with protrusions for processing the outer surface texture of the composite current collector. The shape of the protrusions in the figure is a tapered square table, and can also be set to other structures such as a truncated cone according to needs.

[0035] See also Figure 3 Since the diameter of the main roller is relatively large, in order to increase the temperature of the main roller 41 for easy processing, the main roller 41 includes an inner tube body 411 heated by oil temperature and an outer ring mold body 412 containing the protrusion. The outer ring mold body 412 is sleeved on the outside of the inner tube body 411. The inner tube 411 heated by oil temperature is provided, which can give the main roller 41 a faster temperature response.

[0036] The above are only the preferred embodiments of the present utility model, and do not impose any form of limitation on the present utility model. Although the present utility model has been disclosed above with the preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present utility model. However, as long as it does not depart from the content of the technical solution of the present utility model, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. A device for hot pressing grooves on the surface of a composite current collector, characterized in that: It comprises a furnace body, wherein one end of the furnace body is provided with a feed port, the other end of the furnace body is provided with a discharge port, and a unwinding roller arranged at the feed port and a winding roller arranged at the discharge port; At least one set of roller pressing components is provided in the middle and rear sections of the furnace body; Heating tubes for heating the composite current collector are arranged at the front, middle and rear sections inside the furnace body; and a plurality of rollers arranged along the traveling direction of the composite current collector; It also includes a supporting component for supporting the passing roller, the unwinding roller and the winding roller, The rolling assembly includes a main roller and an auxiliary roller; The outer circumferential surfaces of the main roller and the auxiliary roller are both provided with protrusions for processing the outer surface texture of the composite current collector.

2. The device for hot pressing and forming grooves on the surface of a composite current collector according to claim 1, characterized in that: The main roller comprises an inner tube body heated by oil temperature and an outer ring mold body containing the protrusions, and the outer ring mold body is sleeved on the outer side of the inner tube body.

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