JP7803457B2 - cutting device - Google Patents

Description

This disclosure relates to a cutting device.

As an example of a cutting device for battery electrodes, Patent Document 1 discloses a cutting device that cuts substrates such as paperboard and steel plates by meshing upper and lower blades.

Patent Document 2 discloses a cutting device equipped with a cutting blade that moves forward and backward relative to a continuous body of electrode plates or separators to cut the continuous body, and a cleaning member that moves forward and backward together with the cutting blade to come into contact with and clean the cut portion of the continuous body.

Patent document 3 discloses a cutting device that cuts electrodes by meshing a pair of blades.

Patent No. 3122031 Japanese Patent Application Laid-Open No. 2021-146412 Japanese Patent Application Laid-Open No. 2015-153538

When cutting electrodes, electrode cutting devices are required to prevent contact between the electrode materials and ensure good cutting of the electrodes.

This disclosure was made in consideration of the above situation, and its primary objective is to provide a cutting device that can effectively cut electrodes.

The cutting device of the present disclosure is a cutting device that cuts an electrode by meshing a pair of blades,
a contact pressure applying guide that applies contact pressure to enable one blade to contact the other blade when cutting the electrode and guides the one blade to contact the other blade;
the contact pressure applying guide has a curved portion and a straight portion parallel to the cut surface of the electrode,
the straight portion has a thickness equal to or greater than the thickness of the electrode;
In the cutting device, the angle formed between the electrode surface and the straight portion of the contact pressure applying guide is 90° or more.

The present disclosure provides a cutting device that can effectively cut electrodes.

FIG. 1 is a schematic diagram showing an example of a conventional cutting device and an electrode to be cut. FIG. 2 is a schematic diagram showing an example of a cutting device according to the present disclosure and an electrode to be cut. FIG. 3 is a schematic diagram showing another example of the cutting device of the present disclosure and an electrode to be cut.

Embodiments of the present disclosure will be described below. It should be noted that matters other than those specifically mentioned in this specification that are necessary for implementing the present disclosure (for example, the general configuration and manufacturing process of a cutting device that do not characterize the present disclosure) can be understood as design matters for those skilled in the art based on prior art in the relevant field. The present disclosure can be implemented based on the contents disclosed in this specification and common general technical knowledge in the relevant field.
Furthermore, the dimensional relationships (length, width, thickness, etc.) in the drawings do not reflect the actual dimensional relationships.
In this specification, the use of "to" to indicate a range of values means that the values before and after it are included as the lower and upper limits.
Any combination of upper and lower limits in the numerical range can be adopted.

The cutting device of the present disclosure is a cutting device that cuts an electrode by meshing a pair of blades,
a contact pressure applying guide that applies contact pressure to enable one blade to contact the other blade when cutting the electrode and guides the one blade to contact the other blade;
the contact pressure applying guide has a curved portion and a straight portion parallel to the cut surface of the electrode,
the straight portion has a thickness equal to or greater than the thickness of the electrode;
In the cutting device, the angle formed between the electrode surface and the straight portion of the contact pressure applying guide is 90° or more.

Conventional techniques focus on reducing or eliminating the blade clearance, but do not take into consideration the cross-sectional shape of the workpiece.
Fig. 1 is a schematic diagram showing an example of a conventional cutting device and an electrode to be cut. The chain line in Fig. 1 shows the behavior of the upper blade when cutting the electrode.
As shown in Figure 1, in conventional cutting devices, the guide does not have a straight section whose length is greater than the thickness of the electrode, and the angle θ between the electrode surface and the guide is less than 90°. Therefore, when cutting the electrode, when the upper blade moves along the guide, the cut surface becomes slanted, and the pair of blades cannot be sufficiently pressed together, resulting in misalignment during cutting and contact between the cut surfaces. This results in geometrically large contact between the materials, making it impossible to obtain a good cross section.

This disclosure not only makes it easier to maintain blade clearance, but also improves the quality of the cut cross section, allowing for better cutting of the electrode.

FIG. 2 is a schematic diagram showing an example of a cutting device according to the present disclosure and an electrode to be cut.
3 is a schematic diagram showing another example of the cutting device and the electrode to be cut according to the present disclosure. The dashed lines in Figures 2 and 3 show the behavior of the upper blade when cutting the electrode.
As shown in Figures 2 and 3, in the present disclosure, when cutting an electrode containing a brittle electrode material, the straight portion of the contact pressure applying guide (guiding guide) is made to be equal to or greater than the thickness of the electrode, and the angle θ between the electrode surface and the straight portion of the contact pressure applying guide (guiding guide) is made to be 90° or greater, thereby significantly reducing the occurrence of chipping or falling off of the end of the electrode.
As shown in FIG. 3 , in the present disclosure, even when cutting an electrode at an angle, the pair of blades can be sufficiently pressed together, suppressing misalignment during cutting, contact between the cut surfaces, etc., maintaining the quality of the cut cross section, and enabling the electrode to be cut satisfactorily.

The cutting device of the present disclosure includes a pair of blades and a contact pressure applying guide.
The pair of blades is an upper blade and a lower blade.
The contact pressure applying guide applies contact pressure that allows one blade to come into contact with the other blade when cutting the electrode, and also guides one blade so that it comes into contact with the other blade.
The contact pressure applying guide has a curved portion and a straight portion parallel to the cut surface of the electrode.
The curved portion may be positioned higher in the cutting direction than the straight portion. The curved portion may receive one of the blades (e.g., the upper blade) when cutting the electrode. The one blade may be guided along the curved portion into the straight portion. The straight portion may guide the one blade guided along the curved portion so as to contact the other blade. Through this series of actions, a contact pressure may be applied to the pair of blades that allows one blade to contact the other blade when cutting the electrode.
The straight portion may have a thickness equal to or greater than the thickness of the electrode, from the viewpoint of preventing chipping or falling off of the end portion of the electrode.
The angle θ between the electrode surface and the straight portion of the contact pressure applying guide may be 90° or more.

The electrode to be cut by the cutting device of the present disclosure has a current collector and an electrode layer disposed on one or both sides of the current collector.
As the current collector, any known current collector material that can be used in batteries can be used.
The shape of the current collector is not particularly limited, and various shapes such as foil, mesh, etc. The thickness of the current collector varies depending on the shape, but may be, for example, in the range of 1 μm to 50 μm, or in the range of 5 μm to 20 μm.

The electrode layer disposed on one surface of the current collector may be a positive electrode layer or a negative electrode layer.
Of the two electrode layers disposed on both sides of the current collector, one may be a positive electrode layer and the other a negative electrode layer, or both may be positive electrode layers, or both may be negative electrode layers.
The electrode layer contains at least an active material, and may contain a conductive material, a binder, a solid electrolyte, and the like, as necessary.
The active material, conductive material, binder, and solid electrolyte may be any conventionally known material that can be used in batteries.
The thickness of the electrode layer is not particularly limited, but may be, for example, 10 to 100 μm, or 10 to 20 μm.

The shape of the electrodes disclosed herein may be rectangular, cubic, prism, etc.

The electrode of the present disclosure may be used as an electrode in a primary battery or as an electrode in a secondary battery.
The battery may be an aqueous battery, a non-aqueous battery, an all-solid-state battery, or the like.
The use of the battery is not particularly limited, but examples include power sources for vehicles such as hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), electric vehicles (BEVs), gasoline-powered vehicles, and diesel-powered vehicles. In particular, the battery may be used as a driving power source for hybrid electric vehicles, plug-in hybrid electric vehicles, or electric vehicles. The battery of the present disclosure may also be used as a power source for mobile objects other than vehicles (e.g., trains, ships, and aircraft), or as a power source for electrical appliances such as information processing devices.

Claims (5)

A cutting device that cuts an electrode by meshing a pair of blades,
a contact pressure applying guide that applies contact pressure to enable one blade to contact the other blade when cutting the electrode and guides the one blade to contact the other blade;
the contact pressure applying guide has a curved portion and a straight portion parallel to the cut surface of the electrode,
A cutting device in which the angle formed between the electrode surface and the straight portion of the contact pressure applying guide is 90° or more. the one blade is an upper blade,
the other blade is a lower blade,
the curved portion is disposed above the straight portion in the cutting direction,
2. The cutting device according to claim 1, wherein, when cutting the electrode, the curved portion receives the one blade, the one blade is guided along the curved portion into the straight portion, and the straight portion guides the one blade guided along the curved portion so as to contact the other blade. The cutting device of claim 1, wherein at least a portion of the straight portion is adjacent to the electrode along the cutting surface of the electrode. the curved portion is disposed above the straight portion in the cutting direction,
The cutting device according to claim 3 , wherein the curved portion and the straight portion are integrated. The cutting device described in claim 1, wherein the contact pressure applying guide is provided independently of the pair of blades.