Electrode drying device

Abstract

According to an exemplary embodiment, an electrode drying device is provided, which includes a plurality of light irradiation devices arranged along a direction of travel of an electrode including a plate and an active material, and each of the plurality of light irradiation devices includes a light source configured to generate light in the infrared band and a reflector configured to reflect the light generated by the light source, and the reflector has a parabolic reflective surface.

Description

[Technical Field]

[0001] The present invention relates to an electrode drying device. This application claims the benefit of Korean Application No. 10-2023-0029869, filed on March 7, 2023, which is incorporated herein by reference in its entirety. [Background technology]

[0002] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. Secondary batteries are widely used as energy sources for a variety of wireless devices, such as handsets, laptops, and wireless vacuum cleaners. In recent years, improvements in energy density and economies of scale have dramatically reduced the manufacturing costs of electrically powered hybrid electric vehicles (HEVs) and battery electric vehicles (BEVs). As the driving range of BEVs has increased to the same level as that of fuel-powered vehicles, the primary use of secondary batteries has shifted from mobile devices to mobility.

[0003] The electrode drying process involves removing moisture from the positive and negative electrodes after applying the active material to the sheet-shaped positive and negative electrodes and before separating them. Uniform drying across the entire surface of the electrode sheet can improve the yield and reliability of secondary batteries. Summary of the Invention [Problem to be solved by the invention]

[0004] The problem that the technical concept of the present invention aims to solve is to provide an electrode drying system with improved reliability. [Means for solving the problem]

[0005] According to an exemplary embodiment of the present invention, there is provided an electrode drying apparatus, which includes a plurality of light irradiation devices arranged along a direction of travel of an electrode including a plate and an active material, and each of the light irradiation devices includes a light source configured to generate light in the infrared band and a reflector configured to reflect the light generated by the light source, and the reflecting surface of the reflector is a parabolic surface.

[0006] Each of the plurality of light irradiation devices is configured to irradiate parallel light.

[0007] The light source is positioned at the focus of the paraboloid.

[0008] According to an exemplary embodiment, there is provided an electrode drying apparatus including a first light irradiation device and a second light irradiation device alternately arranged along a direction of travel of an electrode including a polar plate and an active material, the first light irradiation device including a first light source configured to generate first light in an infrared band and a first reflecting mirror configured to reflect the first light generated by the first light source, the second light irradiation device including a second light source configured to generate second light in an infrared band and a second reflecting mirror configured to reflect the second light generated by the second light source, and a first reflecting surface of the first reflecting mirror different from a second reflecting surface of the second reflecting mirror.

[0009] The first reflecting surface is a paraboloid.

[0010] The second reflecting surface is a paraboloid.

[0011] A first focal length of the first reflecting surface is smaller than a second focal length of the second reflecting surface.

[0012] The first light source is at the focal point of the first reflecting surface.

[0013] The second light source is at the focal point of the second reflecting surface.

[0014] The first light emitting device is configured to emit parallel light.

[0015] The second light emitting device is configured to emit non-parallel light.

[0016] The second light irradiation device includes a third reflecting mirror configured to reflect the second light reflected by the second reflecting mirror.

[0017] The third reflecting surface of the third reflecting mirror is a paraboloid.

[0018] The second light source is at the focal point of the second reflecting surface.

[0019] According to an exemplary embodiment, an electrode drying device is provided that includes first and second light irradiation devices alternately arranged along the direction of travel of an electrode including a polar plate and an active material.

[0020] The first light irradiation device includes a first light source configured to generate first light in the infrared band, and a first reflecting mirror configured to reflect the first light generated by the first light source.

[0021] The second light irradiation device includes a second light source configured to generate second light in the infrared band, and a second reflector configured to reflect the second light generated by the second light source.

[0022] The first light emitting device is configured to emit non-collimated light, and the second light emitting device is configured to emit non-collimated light.

[0023] The first reflecting mirror includes a first reflecting surface that is a parabolic surface.

[0024] The second reflecting mirror includes a second reflecting surface that is a paraboloid.

[0025] The first light source is spaced apart from the focal point of the first reflecting surface.

[0026] The second light source is located on the focal point of the second reflecting surface. [Effects of the Invention]

[0027] According to an exemplary embodiment of the present invention, a reflector including a parabolic reflecting surface may be used to irradiate the electrodes with infrared light, which may improve the uniformity of electrode drying.

[0028] The effects that can be obtained from the exemplary embodiments of the present disclosure are not limited to the effects mentioned above, and other effects not mentioned can be clearly derived and understood from the following description by a person having ordinary skill in the art to which the exemplary embodiments of the present disclosure belong. In other words, unintended effects accompanying the implementation of the exemplary embodiments of the present disclosure can also be derived from the exemplary embodiments of the present disclosure by a person having ordinary skill in the art. [Brief explanation of the drawings]

[0029] [Figure 1] 1 is a diagram illustrating an electrode drying device according to an exemplary embodiment; [Figure 2] 2 is a diagram showing the light irradiation device of FIG. 1. [Figure 3] 10 is a diagram illustrating a light irradiation device according to another exemplary embodiment; [Figure 4] 10 is a diagram illustrating a light irradiation device according to another exemplary embodiment; [Figure 5] 10 is a diagram illustrating a light irradiation device according to another exemplary embodiment; [Figure 6] 10 is a diagram illustrating a light irradiation device according to another exemplary embodiment; [Figure 7] 1 is a diagram illustrating an electrode drying device according to an exemplary embodiment; [Figure 8] 1 is a diagram illustrating an electrode drying device according to an exemplary embodiment; DETAILED DESCRIPTION OF THE INVENTION

[0030] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Before that, the terms and words used in the specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted as meanings and concepts that are consistent with the technical idea of ​​the present invention based on the principle that the inventor can appropriately define the concepts of the terms to best describe his own invention.

[0031] Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent the entire technical idea of ​​the present invention, and there may be various equivalents and modifications that can replace them at the time of this application.

[0032] Furthermore, in the description of the present invention, if it is determined that a detailed description of related publicly known structures or functions may obscure the gist of the present invention, the detailed description will be omitted.

[0033] The embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art, and therefore the shapes and sizes of components in the drawings may be exaggerated, omitted, or shown in a schematic manner for clearer explanation. Therefore, the sizes and proportions of each component do not completely reflect the actual sizes and proportions.

[0034] (First embodiment) FIG. 1 is a diagram illustrating an electrode drying device 10 according to an exemplary embodiment.

[0035] FIG. 2 is a diagram showing the light irradiation device 100 of FIG.

[0036] 1 and 2, the electrode drying apparatus 10 may include multiple light irradiation devices 100. The electrode drying apparatus 10 may be configured to perform a drying process for the electrode EL. Here, the drying process is a process of removing moisture from the electrode by irradiating the upper surface ELU and the lower surface ELL of the electrode EL with light IR in the infrared band. The electrode drying apparatus 10 may perform a roll-to-roll drying process. The electrode EL unwound from the first roll R1 is dried by the electrode drying apparatus 10, and the dried electrode EL may be rewound onto the second roll R2.

[0037] The electrode EL can be used to manufacture a secondary battery. The electrode EL can be a positive electrode or a negative electrode. The positive electrode includes a positive electrode plate and a positive electrode active material coated on the positive electrode plate, and the negative electrode includes a negative electrode plate and a negative electrode active material coated on the negative electrode plate.

[0038] Here, the electrode EL can be a positive electrode or a negative electrode of the secondary battery. The positive electrode includes a positive electrode plate and a positive electrode active material coated on the positive electrode plate. The negative electrode includes a negative electrode plate and a negative electrode active material coated on the negative electrode plate.

[0039] The thickness of the positive electrode plate may range from about 3 μm to about 500 μm. The positive electrode plate may be one that does not induce chemical changes in the final secondary battery and may have high conductivity. The positive electrode plate may include, for example, stainless steel, nickel, titanium, calcined carbon, and aluminum. The positive electrode plate may also include stainless steel that has been surface-treated with carbon, nickel, titanium, silver, or the like. The surface of the positive electrode plate may include a micro-textured structure to enhance the adhesion of the active material. The positive electrode plate may have the shape of a film, sheet, foil, net, porous material, foam, nonwoven fabric, or the like.

[0040] The thickness of the negative electrode plate may range from about 3 μm to about 500 μm. The negative electrode plate may be one that does not induce chemical changes in the final secondary battery and may have high conductivity. The negative electrode plate may include copper, stainless steel, aluminum, nickel, titanium, sintered carbon, and aluminum-cadmium alloy. The negative electrode plate may also include stainless steel surface-treated with carbon, nickel, titanium, silver, or the like. The surface of the negative electrode plate may include a micro-textured structure to enhance the adhesion of the active material. The negative electrode plate may have the shape of a film, sheet, foil, net, porous material, foam, nonwoven fabric, or the like.

[0041] The positive electrode active material is a material capable of undergoing an electrochemical reaction. The positive electrode active material can be a lithium transition metal oxide. Examples of the positive electrode active material include layered compounds such as lithium cobalt oxide (LiCoO2) and lithium nickel oxide (LiNiO2) substituted with one or more transition metals; lithium manganese oxide substituted with one or more transition metals; and lithium manganese oxides with the chemical formula LiNi 1-y M y Lithium nickel-based oxide represented by O2 (where M is any one of Co, Mn, Al, Cu, Fe, Mg, B, Cr, Zn, and Ga, and 0.01≦y≦0.7); Li 1+z Ni 1 / 3 Co 1 / 3 Mn 1 / 3 O2, Li 1+z Ni 0.4 Mn 0.4 Co 0.2 Li like O2 1+z Ni b Mn c Co 1-(b+c+d) M d O (2-e) A e (wherein -0.5≦z≦0.5, 0.1≦b≦0.8, 0.1≦c≦0.8, 0≦d≦0.2, 0≦e≦0.2, b+c+d<1, M is any one of Al, Mg, Cr, Ti, Si, and Y, and A is any one of F, P, and Cl); lithium nickel cobalt manganese composite oxide represented by the chemical formula Li 1+x M1-y M’ y PO 4-z X z (Here, M is a transition metal, more specifically, any one of Fe, Mn, Co, and Ni, M’ is any one of Al, Mg, and Ti, X is any one of F, S, and N, -0.5 ≦ x ≦ +0.5, 0 ≦ y ≦ 0.5, 0 ≦ z ≦ 0.1), and may include olivine-type lithium metal phosphate represented by

[0042] The negative electrode active material may include carbon such as graphitizable carbon and graphite-based carbon. The negative electrode active material is, for example, Li x Fe2O3 (0 ≦ x ≦ 1), Li x WO2 (0 ≦ x ≦ 1), Sn x Me 1-x Me’ y O z (Here, Me is any one of Mn, Fe, Pb, and Ge, Me’ is any one of Al, B, P, Si, Group 1 elements, Group 2 elements, Group 3 elements, and halogens in the periodic table; 0 < x ≦ 1; 1 ≦ y ≦ 3; 1 ≦ z ≦ 8), and may include metal composite oxides such as

[0043] Each of the plurality of light irradiation devices 100 may be configured to irradiate the electrode EL with light IR in the infrared band. The wavelength of the light IR generated by the plurality of light irradiation devices 100 may be in the range of about 0.78 μm to about 2.5 μm. Some of the plurality of light irradiation devices 100 may be arranged on the electrode EL and irradiate the upper surface ELU of the electrode EL with light IR. Some of the plurality of light irradiation devices 100 may be arranged under the electrode EL and irradiate the lower surface ELL of the electrode EL with light IR.

[0044] According to an exemplary embodiment, the light IR irradiated by the plurality of light irradiation devices 100 may be collimated, thereby making the light IR parallel light, and improving the uniformity of drying of the electrodes EL.

[0045] According to an exemplary embodiment, each of the multiple light irradiation devices 100 may include a light source 110 and a reflector 120. The light source 110 may be configured to generate light IR in the infrared band. The reflector 120 may include a reflective surface 120R having high reflectivity and low absorption of the light IR. As an example, the reflectivity of the reflective surface 120R with respect to the incident light IR may be approximately 95% or more. As another example, the reflectivity of the reflective surface 120R with respect to the incident light IR may be approximately 99% or more. As another example, the reflectivity of the reflective surface 120R with respect to the incident light IR may be approximately 99.9% or more.

[0046] According to an exemplary embodiment, the reflecting surface 120R may be a paraboloid. According to an exemplary embodiment, the light source 110 may be positioned at the focal point of the reflecting surface 120R. As a result, the light IR generated by the light source 110 and reflected by the reflecting surface 120R may be substantially parallel to the optical axis of the reflecting surface 120R. Here, the optical axis may be the axis of rotational symmetry of the optical system, which may be a straight line connecting the centers of symmetry of the refraction and reflection surfaces. That is, the light IR generated by the light source 110 and reflected by the reflecting surface 120R may be parallel light.

[0047] (Second embodiment) 3 is a diagram illustrating a light irradiation device 101 according to another exemplary embodiment. The light irradiation device 101 in FIG. 3 can be an electrode drying device 10 and can replace the light irradiation device 100 in FIG.

[0048] 3, according to an exemplary embodiment, the light irradiation device 101 may include a light source 110 and a reflector 120. The light source 110 and the reflector 120 are substantially the same as those described with reference to FIGS.

[0049] The light source 110 may not be positioned on the focal point FP. According to an exemplary embodiment, the light source 110 may be spaced apart from the focal point FP of the reflecting surface 120R. According to an exemplary embodiment, the light source 110 may be closer to the reflecting surface 120R than the focal point FP. This may cause the light IR generated by the light source 110 and reflected by the reflecting surface 120R to be oblique to the optical axis of the reflecting surface 120R. That is, the light IR generated by the light source 110 and reflected by the reflecting surface 120R may be non-parallel light. The light IR generated by the light source 110 and reflected by the reflecting surface 120R may be diffuse light.

[0050] According to an exemplary embodiment, the light irradiation device 101 emits diffused light, which increases the area of ​​the portion of the electrode EL covered by the light IR emitted by the light irradiation device 101. This may reduce the number of light irradiation devices 101 required to perform the drying process.

[0051] (Third embodiment) 4 is a diagram illustrating a light irradiation device 102 according to another exemplary embodiment. The light irradiation device 102 in FIG. 4 can replace the light irradiation device 100 in FIG. 2 in the electrode drying device 10.

[0052] 4, according to an exemplary embodiment, the light irradiation device 102 may include a light source 110 and a reflector 121. The light source 110 is substantially the same as that described with reference to FIGS.

[0053] The reflector 121 may include a reflective surface 121R that has high reflectivity and low absorption of incident light IR. As an example, the reflectivity of the reflective surface 121R to incident light IR may be approximately 95% or greater. As another example, the reflectivity of the reflective surface 121R to incident light IR may be approximately 99% or greater. As another example, the reflectivity of the reflective surface 121R to incident light IR may be approximately 99.9% or greater.

[0054] According to an exemplary embodiment, the reflective surface 121R may be a paraboloid. According to an exemplary embodiment, the light source 110 may be positioned at the focal point of the reflective surface 121R. This allows the light IR generated by the light source 110 and reflected by the reflective surface 121R to be substantially parallel to the optical axis of the reflective surface 121R.

[0055] 2 and 4, the focal length f2 of the reflecting surface 121R may be greater than the focal length f1 of the reflecting surface 120R. This may cause a larger portion of the light IR generated by the light source 110 to become parallel light, thereby improving the energy efficiency of the light irradiation device 102. Furthermore, since the cross-sectional area of ​​the light IR irradiated by the light irradiation device 102 is reduced, the temperature of the electrode EL (see FIG. 1) may be increased at a faster rate than in the light irradiation device 100 of FIG. 2, thereby improving the efficiency of the drying process.

[0056] (Fourth embodiment) 5 is a diagram illustrating a light irradiation device 103 according to another exemplary embodiment. The light irradiation device 103 in FIG. 5 can replace the light irradiation device 100 in FIG. 2 in the electrode drying device 10.

[0057] 5, according to an exemplary embodiment, the light irradiation device 103 may include a light source 111 and a reflector 120. The reflector 120 is substantially the same as that described with reference to FIGS.

[0058] According to an exemplary embodiment, the light source 111 may be a surface light source. The light IR generated by the light source 111 may be collimated. According to an exemplary embodiment, the light source 111 may include a beam former for shaping the cross section of the light IR.

[0059] The light source 111 may not be located on the focal point FP. According to an exemplary embodiment, the light source 111 may be spaced apart from the position of the focal point FP of the reflective surface 120R. According to an exemplary embodiment, the light source 111 may be spaced apart further from the reflective surface 120R than the position of the focal point FP of the reflective surface 120R. According to an exemplary embodiment, the light source 111 may be spaced apart from the reflective surface 120R with the position of the focal point FP of the reflective surface 120R therebetween. This may prevent interference between the light source 111 and the light IR reflected by the reflective surface 120R.

[0060] According to an exemplary embodiment, the light IR generated by the light source 111 and reflected by the reflective surface 120R may be oblique to the optical axis of the reflective surface 120R. That is, the light IR generated by the light source 111 and reflected by the reflective surface 120R may be non-parallel light. The light IR generated by the light source 111 and reflected by the reflective surface 120R may be diffuse light.

[0061] According to an exemplary embodiment, the light irradiation devices 103 irradiate diffused light, thereby increasing the area of ​​the electrode portion that is covered, thereby achieving the execution of the electrode drying process using a relatively small number of light irradiation devices 103.

[0062] (Fifth embodiment) 6 is a diagram illustrating a light irradiation device 104 according to another exemplary embodiment. The light irradiation device 104 in FIG. 6 can replace the light irradiation device 100 in FIG. 2 in the electrode drying device 10.

[0063] 6, according to an exemplary embodiment, the light irradiation device 104 may include a light source 110, a first reflecting mirror 123, and a second reflecting mirror 125. The light source 110 is substantially the same as that described with reference to FIGS. 1 and 2. The first reflecting mirror 123 and the second reflecting mirror 125 are substantially the same as the reflecting mirror 120 described with reference to FIGS. 1 and 2. That is, the first reflecting mirror 123 may include a first reflecting surface 123R that is a parabolic surface, and the second reflecting mirror 125 may include a second reflecting surface 125R that is a parabolic surface.

[0064] According to an exemplary embodiment, the light source 110 may be located at the focal point of the first reflecting surface 123R of the first reflecting mirror 123. As a result, the light IR generated by the light source 110 may be reflected and collimated by the first reflecting mirror 123. The light IR collimated by the first reflecting mirror 123 may be reflected by the second reflecting mirror 125. The light reflected by the second reflecting mirror 125 may be non-parallel light. The light reflected by the second reflecting mirror 125 may be diffuse light.

[0065] According to an exemplary embodiment, the light irradiation devices 104 emit diffused light, thereby increasing the area of ​​the electrode portion they cover, which may reduce the number of light irradiation devices 104 required to perform the drying process.

[0066] (Sixth embodiment) FIG. 7 is a diagram illustrating an electrode drying device 11 according to an exemplary embodiment.

[0067] 7, the electrode drying device 11 may be configured to perform a drying process for the electrode EL. The electrode drying device 11 may include a first light irradiation device 100a and a second light irradiation device 100b. According to an exemplary embodiment, the first light irradiation devices 100a and the second light irradiation devices 100b may be arranged alternately. This allows the second light irradiation devices 100b to be interposed between the first light irradiation devices 100a, and the first light irradiation devices 100a to be interposed between the second light irradiation devices 100b.

[0068] According to an exemplary embodiment, the first light irradiation device 100a may be different from the second light irradiation device 100b. The first light irradiation device 100a may be one of the light irradiation devices 100, 101, 102, 103, and 104 of Figures 2 to 6, and the second light irradiation device 100b may be another one of the light irradiation devices 100, 101, 102, 103, and 104 of Figures 2 to 6. As an example, the first light irradiation device 100a may be the light irradiation device 100 of Figure 2, and the second light irradiation device 100b may be the light irradiation device 101 of Figure 3.

[0069] Seventh embodiment FIG. 8 is a diagram illustrating an electrode drying device 12 according to an exemplary embodiment.

[0070] 8, the electrode drying device 12 may be configured to perform a drying process for the electrode EL. The electrode drying device 12 may include first to fourth light irradiation devices 100a, 100b, 100c, and 100d. The first to fourth light irradiation devices 100a, 100b, 100c, and 100d may be arranged along the traveling direction of the electrode EL.

[0071] According to an exemplary embodiment, each of the first to fourth light irradiation devices 100a, 100b, 100c, and 100d may be one of the light irradiation devices 100, 101, 102, 103, and 104 of FIGS.

[0072] According to an exemplary embodiment, the first to fourth light irradiation devices 100a, 100b, 100c, and 100d may be different from each other. For example, the first light irradiation device 100a may be the light irradiation device 100 in Fig. 2, the second light irradiation device 100b may be the light irradiation device 101 in Fig. 3, the third light irradiation device 100c may be the light irradiation device 102 in Fig. 4, and the fourth light irradiation device 100d may be the light irradiation device 103 in Fig. 5.

[0073] According to an exemplary embodiment, some of the first to fourth light irradiation devices 100a, 100b, 100c, and 100d may be the same as one another. For example, the first light irradiation device 100a may be the light irradiation device 100 in Fig. 2, the second light irradiation device 100b may be the light irradiation device 100 in Fig. 2, the third light irradiation device 100c may be the light irradiation device 101 in Fig. 3, and the fourth light irradiation device 100d may be the light irradiation device 102 in Fig. 4.

[0074] The present invention has been described in more detail above through the drawings and embodiments, etc. However, the configurations described in the drawings or embodiments in this specification are merely one embodiment of the present invention and do not represent all of the technical ideas of the present invention, and therefore, at the time of filing this application, there may be various equivalents and modifications that can replace them.

Claims

1. a plurality of light irradiation devices arranged along the direction of movement of the electrode including the electrode plate and the active material; Each of the plurality of light irradiation devices is a light source configured to generate light in the infrared band; a reflector configured to reflect light generated by the light source; The electrode drying device, wherein the reflecting surface of the reflector is a parabolic surface.

2. The electrode drying device according to claim 1 , wherein each of the plurality of light irradiation devices is configured to irradiate parallel light.

3. The electrode drying device according to claim 1 , wherein the light source is disposed on a focus of the paraboloid.

4. The electrode includes a first light irradiation device and a second light irradiation device that are alternately arranged along a direction in which the electrode plate and the electrode containing the active material advance, The first light irradiation device is a first light source configured to generate first light in the infrared band; a first reflector configured to reflect the first light generated by the first light source; The second light irradiation device is a second light source configured to generate second light in the infrared band; and a second reflector configured to reflect the second light generated by the second light source; The electrode drying device, wherein a first reflecting surface of the first reflecting mirror is different from a second reflecting surface of the second reflecting mirror.

5. The electrode drying device according to claim 4 , wherein the first reflecting surface is a parabolic surface.

6. The electrode drying device according to claim 5 , wherein the second reflecting surface is a parabolic surface.

7. The electrode drying device according to claim 6 , wherein a first focal length of the first reflecting surface is smaller than a second focal length of the second reflecting surface.

8. the first light source is at the focal point of the first reflecting surface; The electrode drying device according to claim 7 , wherein the second light source is located at a focal point of the second reflecting surface.

9. the first light irradiation device is configured to irradiate parallel light; The electrode drying device according to claim 4 , wherein the second light irradiating device is configured to irradiate non-parallel light.

10. The electrode drying device according to claim 4 , wherein the second light irradiation device includes a third reflecting mirror configured to reflect the second light reflected by the second reflecting mirror.

11. The electrode drying device according to claim 10 , wherein the third reflecting surface of the third reflecting mirror is a parabolic surface.

12. The electrode drying apparatus according to claim 10 , wherein the second light source is located at a focal point of the second reflecting surface.

13. The electrode includes a first light irradiation device and a second light irradiation device that are alternately arranged along a direction in which the electrode plate and the electrode containing the active material advance, The first light irradiation device is a first light source configured to generate first light in the infrared band; a first reflector configured to reflect the first light generated by the first light source; The second light irradiation device is a second light source configured to generate second light in the infrared band; and a second reflector configured to reflect the second light generated by the second light source; and The electrode drying device, wherein the first light irradiation device is configured to irradiate non-parallel light, and the second light irradiation device is configured to irradiate parallel light.

14. the first reflecting mirror includes a first reflecting surface that is a parabolic surface, the second reflecting mirror includes a second reflecting surface that is a parabolic surface, The electrode drying apparatus according to claim 13 , wherein the first light source is spaced apart from a focal point of the first reflecting surface.

15. The electrode drying apparatus according to claim 14 , wherein the second light source is located on a focal point of the second reflecting surface.

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