Title of the invention: Winding device for manufacturing electrode assembly
Technical field
[One]
This application claims the benefit of priority based on Korean Patent Application No. 10-2018-0112413 filed on September 19, 2018, and all contents disclosed in the documents of the Korean patent application are incorporated as part of this specification.
[2]
The present invention relates to a winding device for manufacturing an electrode assembly.
Background
[3]
Recently, interest in environmental pollution and rising prices of energy sources due to depletion of fossil fuels has been amplified, and the demand for eco-friendly alternative energy sources has become an indispensable factor for future life. Accordingly, research on various power generation technologies such as nuclear power, solar power, wind power, and tidal power is continuing, and a power storage device for more efficient use of the energy thus produced is also drawing great interest.
[4]
Moreover, as technology development and demand for mobile devices and battery vehicles increase, the demand for batteries as an energy source is rapidly increasing, and accordingly, many studies on batteries that can meet various demands are being conducted. In particular, in terms of materials, there is a high demand for lithium secondary batteries such as lithium ion batteries and lithium ion polymer batteries having advantages such as high energy density, discharge voltage, and output stability.
[5]
Secondary batteries are classified according to the structure of an electrode assembly in which a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode are stacked. Typically, a jelly-roll type (wound type) electrode assembly in which a long sheet-shaped anode and cathode are wound with a separator interposed therebetween, and a plurality of anodes and cathodes cut in units of a predetermined size are interposed with the separator. Stacked (stacked) electrode assemblies that are sequentially stacked. Recently, in order to solve the problems of the jelly-roll type electrode assembly and the stack type electrode assembly, the jelly-roll type and the stack type are mixed. As an electrode assembly having an advanced structure, a stack/folding type electrode assembly having a structure in which unit cells in which a predetermined unit of anodes and cathodes are stacked with a separator interposed therebetween are sequentially wound on a separation film has been developed.
[6]
Among these electrode assemblies, the jelly-roll type electrode assembly is easy to manufacture and has a high energy density per weight, and is thus used as an energy source for various devices ranging from portable computers to battery vehicles.
[7]
1 is a schematic diagram showing a winding portion of a conventional jelly-roll type electrode assembly manufacturing apparatus.
[8]
Referring to FIG. 1, the anode 11, the cathode 12, and the separator 13 are introduced into the winding core 15 in the winding unit 10 and are wound, thereby making a jelly-roll. Jelly-roll type electrode assembly manufacturing apparatus, although not shown in addition to the winding unit 10, includes various facilities such as an electrode fusion unit, an electrode cutting unit, and a roller driving unit, and various metallic and non-metallic foreign substances are generated by the operation of these facilities. These foreign substances are located on the surfaces of the anode 11 and cathode 12 flowing into the winding core 15 and are wound together, thereby causing problems such as low voltage and short circuit.
[9]
In order to solve this problem, a method of removing metallic foreign matters by disposing a foreign matter removing device 14 at the portions of the anode 11 and the cathode 12 flowing into the winding core 15 is used.
[10]
However, since the aforementioned foreign matters are introduced from various places other than the areas where the anode 11, the cathode 12, and the separator 13 are introduced, the foreign matter removal device installed locally around the electrode and the separator effectively removes the foreign matter. There is a problem that cannot be done.
[11]
Therefore, there is a need for a technology that can fundamentally solve this problem.
Detailed description of the invention
Technical challenge
[12]
An object of the present invention is to solve the problems of the prior art and technical problems that have been requested from the past.
[13]
The inventors of the present application have undergone in-depth research and various experiments, and as will be described later, a winding device for manufacturing an electrode assembly includes a foreign material removing unit having a structure surrounding the winding core, and forming a suction port on the inner surface of the foreign material removing unit By doing this, it was confirmed that foreign substances can be effectively removed, and the present invention was completed.
Means of solving the task
[14]
The winding device for manufacturing an electrode assembly according to the present invention for achieving this object includes a body portion, a winding core for winding an electrode and a separator, and a foreign material removing part connected to the main body and removing foreign materials, and the foreign material removing part It may be formed in a structure that surrounds the core in a state spaced apart from the core.
[15]
The foreign material removing part may include an inlet through which the electrode and the separator are introduced.
[16]
The foreign material removing unit may be formed in a cylindrical structure.
[17]
The diameter of the cylinder may be formed at least larger than the diameter of the electrode assembly.
[18]
The foreign material removing unit may include a suction port formed on an inner surface.
[19]
The foreign material sucked through the suction port may be discharged to the outside through the main body.
[20]
The foreign material removing part may be separated from the body part.
[21]
The foreign material removing unit may further include a magnet.
[22]
The magnet may be formed at a portion of the foreign material removing portion where the inlet portion is formed.
[23]
It may further include a cover that covers the opening of the foreign material removing unit.
[24]
The cover part is a winding device for manufacturing an electrode assembly separated from the body part.
Brief description of the drawing
[25]
1 is a schematic diagram showing a winding portion of a conventional jelly-roll type electrode assembly manufacturing apparatus.
[26]
2 is a schematic diagram showing a winding device for manufacturing an electrode assembly according to an embodiment of the present invention.
[27]
3 is a cross-sectional view of the winding device for manufacturing the electrode assembly of FIG. 2.
[28]
4 is a schematic diagram showing a winding device for manufacturing an electrode assembly according to another embodiment of the present invention.
[29]
5 is a schematic diagram showing a winding device for manufacturing an electrode assembly according to another embodiment of the present invention.
Mode for carrying out the invention
[30]
Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the present invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein.
[31]
In addition, throughout the specification, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components unless otherwise stated.
[32]
In addition, throughout the specification, when referred to as "cross-sectional view", it means when the cross-section of the target portion is cut vertically when viewed from the side.
[33]
2 is a schematic diagram showing a winding device for manufacturing an electrode assembly according to an embodiment of the present invention. 3 is a cross-sectional view of the winding device for manufacturing the electrode assembly of FIG. 2.
[34]
Referring to FIGS. 2 and 3, the winding device 100 for manufacturing an electrode assembly includes a main body 101, a winding core 102, and a foreign material removing part 103. An inlet part 104 into which an electrode (not shown) and a separator (not shown) are introduced is formed in the foreign matter removing part 103. The electrode and the separator are introduced into the winding core 102 through the inlet portion 104 and wound. The shape of the inlet part 104 may be variously formed according to the shape of the electrode and the separator, but in order to minimize the inflow of foreign matter through the inlet part 104, the minimum size that the electrode and the separator can be introduced without interference It is preferably formed of. In general, since the electrode and the separator are in the shape of a sheet having a predetermined thickness and a length compared to the width, the inlet portion 104 may have a shape into which the sheet can be introduced.
[35]
The shape of the foreign matter removing unit 103 is not particularly limited, and may be variously formed in consideration of the shape of the electrode assembly and manufacturing facilities, etc., but the core 102 is maintained at a constant distance from the core 102 It is preferable to form a cylindrical structure surrounding it. The foreign material removing part 103 shown in FIG. 2 is formed in a cylindrical structure. The diameter of the foreign material removing unit 103 may be at least larger than the diameter of the electrode assembly in which winding is completed. In addition, the length of the foreign material removing unit 103 is at least equal to or longer than the length of the winding core 102. Here, the length of the foreign material removing part 103 means a length defined along the direction in which the winding core 102 extends. When the electrode and the separator are wound by this structure, foreign matter can be effectively prevented from flowing into the core.
[36]
A plurality of suction ports 105 are formed on the inner surface 109 of the foreign matter removing unit 103. The position at which the suction ports 105 are formed is not particularly limited, but may be formed while maintaining a predetermined distance on the inner surface 109 of the foreign material removing unit 103. Depending on the needs of the operator, the suction ports 105 may be formed in a relatively large number of specific areas. As an example, the suction ports 105 are intensively disposed on the inner surface of the foreign material removing unit 103 adjacent to the opening 106 of the foreign material removing unit 103, so that foreign matter flowing through the opening 106 can be effectively removed. . Here, the opening 106 may be a portion corresponding to a boundary between the outer space and the inner space of the foreign material removing unit 105 having a cylindrical structure. Alternatively, the suction ports 105 may be intensively disposed on the inner surface 109 of the foreign material removing unit 103 adjacent to the inlet unit 104 to effectively remove the foreign material introduced through the inlet unit 104. The foreign matter introduced through the inlet 105 moves to the main body 101 through the inner moving passage 121 between the inner surface 109 and the outer surface 110 of the foreign matter removal unit 103 and is discharged to the outside. An air suction pump 120 may be formed in the main body 101, and foreign substances are introduced into the foreign substance removing unit 103 through the suction ports 105 by the air suction pump 120, thereby forming the main body 101. Can be released to the outside through.
[37]
Through this structure, when the electrode and the separator are wound, it is possible to prevent foreign matters from flowing into the winding core 102, as well as effectively remove the introduced foreign matters through the inlet 105.
[38]
The foreign material removing unit 103 is connected to the body unit 101, but can be separated if necessary.
[39]
4 is a schematic view showing a winding device for manufacturing an electrode assembly according to another embodiment of the present invention.
[40]
Referring to FIG. 4, the winding device 200 for manufacturing an electrode assembly further includes a magnet 107 at a portion of the foreign material removing portion 103 where the inlet portion 104 is formed. For convenience of explanation, only one of the plurality of magnets 107 is represented by a leader line. The magnet 107 separates and removes metal foreign matters attached to the electrode flowing into the inlet 104 by magnetic force. The metallic foreign matters are generated during the cutting process of the electrode, and they are heavier than the weight of the non-metallic foreign matters and thus may not be sucked through the suction port 105. When the metal materials that have not been removed are wound together with the electrodes, it causes a short circuit as well as deformation of the electrode assembly.
[41]
The portion of the foreign material removing unit 103 where the magnet 107 can be formed is not particularly limited. It may be formed on the inner surface 109 as well as the outer surface 110 of the foreign material removing unit 103, and if necessary, some or all of the foreign material removing unit 103 may be formed with a magnet.
[42]
5 is a schematic diagram showing a winding device for manufacturing an electrode assembly according to another embodiment of the present invention.
[43]
Referring to FIG. 5, the winding device 300 for manufacturing an electrode assembly may further include a cover part 108. The cover part 108 is connected to the foreign material removing part 103 in a form that covers the opening 106. During the winding process of the electrode assembly, the cover part 108 is coupled to the foreign material removing part 103 to prevent the foreign material from flowing through the opening 106. When the winding of the electrode assembly is completed, the cover part 108 may be separated from the foreign material removing part 103 and the electrode assembly may be separated from the winding core 102.
[44]
Those of ordinary skill in the field to which the present invention belongs will be able to make various applications and modifications within the scope of the present invention based on the above contents.
Industrial availability
[45]
As described above, the winding device for manufacturing an electrode assembly according to the present invention includes a foreign material removing unit having a structure surrounding the periphery of the winding core, and forming a suction port on the inner surface of the foreign material removing unit to prevent the inflow of foreign matter as well as the inflow. It can effectively remove the foreign matter.
Claims
[Claim 1]
Body part; Winding the electrode and the separator; And a foreign material removing part connected to the main body and removing foreign materials. Including, wherein the foreign matter removing unit is formed in a structure to surround the periphery of the winding core in a state spaced from the winding core winding device for manufacturing an electrode assembly.
[Claim 2]
The winding device for manufacturing an electrode assembly according to claim 1, wherein the foreign material removing part includes an inlet through which the electrode and the separator are introduced.
[Claim 3]
According to claim 1, The foreign material removing unit winding device for manufacturing an electrode assembly formed in a cylindrical structure.
[Claim 4]
The winding device for manufacturing an electrode assembly according to claim 3, wherein the diameter of the cylinder is at least larger than the diameter of the electrode assembly.
[Claim 5]
The winding device for manufacturing an electrode assembly according to claim 1, wherein the foreign material removing unit includes a suction port formed on an inner surface thereof.
[Claim 6]
The winding device for manufacturing an electrode assembly according to claim 5, wherein the foreign material sucked through the suction port is discharged to the outside through the main body.
[Claim 7]
According to claim 1, The foreign material removing unit is a winding device for manufacturing an electrode assembly separated from the main body.
[Claim 8]
The apparatus of claim 2, wherein the foreign material removing unit further comprises a magnet.
[Claim 9]
According to claim 8, The magnet is a winding device for manufacturing an electrode assembly formed in the portion of the foreign material removing portion in which the inlet portion is formed.
[Claim 10]
The winding device for manufacturing an electrode assembly according to claim 1, further comprising a cover part covering the opening of the foreign material removing part.
[Claim 11]
The apparatus of claim 10, wherein the cover part is separated from the main body part.