Secondary battery module frame and secondary battery module containing the same

Abstract

The present invention relates to a secondary battery module frame, and provides a secondary battery module frame including: a main body having an accommodating space formed therein; and a plurality of exposure holes penetrating one side of the main body to expose the accommodating space, wherein the exposure holes each have a non-light-emitting portion formed along a periphery of an inner surface of the exposure hole to diffusely reflect light incident on the inner surface of the exposure hole.

Description

Technical Field

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0092516 filed on July 17, 2023, and all the contents disclosed in the literature of the Korean Patent Application are incorporated herein by reference as part of this specification.

[0002] The present invention relates to a secondary battery module frame and a secondary battery module including the same, and more particularly, to a secondary battery module frame capable of diffusely reflecting light incident on an inner surface of an exposed hole of the secondary battery module frame and a secondary battery module including the same.

Background Art

[0003] A rechargeable battery is a battery that can be charged and discharged, unlike a non-rechargeable primary battery. Rechargeable batteries are highly applicable to various product groups and have electrical characteristics with a high energy density. Such rechargeable batteries are applied not only to portable electronic devices but also to electric vehicles or hybrid vehicles driven by an electric drive source, power storage devices, etc. Rechargeable batteries are attracting attention as a new energy source for enhancing environmental friendliness and energy efficiency not only because of the primary merit of significantly reducing the use of fossil fuels but also because no by-products are generated due to the use of energy.

[0004] For medium to large-sized devices such as electric vehicles, high-output and high-capacity secondary batteries are required, and a number of secondary battery modules in which a number of secondary batteries are electrically connected are used. Such secondary battery modules are preferably manufactured in as small a size and weight as possible, and prismatic secondary batteries, pouch-type secondary batteries, cylindrical secondary batteries, etc., having a small weight relative to the capacity, are mainly used.

[0005] Furthermore, the manufacturing process for secondary battery modules is automated, and the manufacturing equipment for secondary battery modules uses a vision device to secure visual images before performing the process. In particular, the wire joining process that connects the electrode terminals and busbars in the manufacturing process of cylindrical secondary battery modules is performed through small holes formed in the secondary battery module, requiring precise work. However, in images captured by the vision device, the boundary surface of the holes is not clearly visible due to light reflected from the holes, which can lead to errors in the wire joining position. Therefore, there is a need to develop technology to solve the aforementioned problems. [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] The present invention aims to solve the above-mentioned problems and provides a secondary battery module frame that diffusely reflects light incident on the inner surface of an exposure hole, and a secondary battery module including the same, so as to clearly form the inner region boundary of the exposure hole that exposes the housing space in an image or video generated by photographing the secondary battery module frame with a camera. [Means for solving the problem]

[0007] As a first embodiment of the present invention, the present invention provides a secondary battery module frame comprising a main body having a housing space formed inside, and a plurality of exposure holes that penetrate one surface of the main body and are provided so as to expose the housing space, wherein the exposure holes have non-reflective portions formed along the periphery of the inner surface of the exposure holes, which diffusely reflect light incident on the inner surface of the exposure holes.

[0008] Furthermore, an irregular pattern of first uneven surfaces can be formed on the non-reflective portion.

[0009] Furthermore, the average surface roughness of the first uneven surface can be set to 0.35 μm to 3.00 μm.

[0010] Furthermore, the non-reflective portion can have a lower luminance compared to the surface adjacent to the exposure hole.

[0011] Furthermore, the plurality of exposure holes can form a plurality of exposure hole lines on one surface of the main body, in which the exposure holes are arranged in a line along a first direction, and the plurality of exposure hole lines can be arranged in a second direction perpendicular to the first direction.

[0012] Furthermore, a busbar groove recessed to a predetermined depth along the first direction can be formed between the exposed hole line and the adjacent exposed hole line.

[0013] Furthermore, the exposed hole is injection molded using a mold in which a protrusion is formed on one surface to form the exposed hole, and a second uneven surface can be formed on the protrusion along the periphery of the outer surface.

[0014] Furthermore, the first uneven surface can be formed as a surface corresponding to the second uneven surface.

[0015] Furthermore, the second uneven surface can have an average surface roughness of 0.35 μm to 3.00 μm.

[0016] Furthermore, the second uneven surface can be formed by chemically corroding the surface of the protruding portion.

[0017] Furthermore, the second uneven surface can be formed by electrically discharging the surface of the protruding portion.

[0018] As a second embodiment of the present invention, the present invention provides a secondary battery module comprising a plurality of secondary batteries, a main body in which the plurality of secondary batteries are housed in an internal housing space, and a plurality of exposed holes penetrating one surface of the main body, in which the electrode terminals of the secondary batteries are exposed, wherein the exposed holes have non-reflective portions formed along the periphery of the inner surface of the exposed holes, which diffusely reflect light incident on the inner surface of the exposed holes.

[0019] Furthermore, it further includes a wire having one end joined to the electrode terminal of the secondary battery, and the wire can be joined at a position spaced a predetermined distance inward from the inner surface of the exposed hole.

[0020] Furthermore, it can further include a bus bar located on one surface of the main body and arranged adjacent to the exposed hole.

[0021] Furthermore, the wire can penetrate the exposed hole and join the other end to the bus bar.

Advantages of the Invention

[0022] In the secondary battery module frame of the present invention, a lightless portion that diffusely reflects light is formed on the inner surface of the exposed hole that exposes the internal accommodation space. In the manufacturing process of the secondary battery module, by a vision inspection device, the boundary of the exposed hole can be clarified in the image of the secondary battery module taken, improving the image quality, and in the process of joining a wire to the electrode terminal of the secondary battery through the exposed hole, the accuracy of the joining position of the wire on the electrode terminal can be improved.

Brief Description of the Drawings

[0023] [Figure 1] As a first embodiment of the present invention, it is a perspective view showing the outer shape of the secondary battery module frame. [Figure 2] As a first embodiment of the present invention, it is an enlarged perspective view showing an enlarged view of the "A" region in FIG. 1. [Figure 3] As a first embodiment of the present invention, it is a cross-sectional view schematically showing the state of the first concavo-convex surface formed on the lightless portion. [Figure 4] It is a cross-sectional view showing the state in which the lightless portion is injection-molded by the first mold and the second mold. [Figure 5] As a second embodiment of the present invention, it is a perspective view showing the state of the secondary battery module. [Figure 6] As a second embodiment of the present invention, it is an enlarged perspective view showing an enlarged view of the "B" region in FIG. 5. [Figure 7] As an image generated by actually photographing an exposure hole with a vision inspection device, (a) is an image showing an unclear boundary of the exposure hole when there is no lightless part, and (b) is an image showing a lightless part formed on the inner surface of the exposure hole and a clear boundary of the exposure hole.

Embodiments for Carrying Out the Invention

[0024] Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail so that those having ordinary knowledge in the technical field to which the present invention pertains can easily implement it. However, the present invention can be realized in various different forms and is not limited or restricted by the following embodiments.

[0025] In order to clearly explain the present invention, detailed descriptions of parts not related to the explanation or of related known technologies that may obscure the gist of the present invention are omitted. When assigning reference numerals to the components of each drawing in this specification, the same or similar reference numerals are assigned to the same or similar components throughout the specification.

[0026] Also, the terms and words used in this specification and the claims should not be construed as being limited to their ordinary or dictionary meanings. The inventors should interpret them in accordance with the meaning and concept consistent with the technical idea of the present invention in accordance with the principle that they can appropriately define the concept of the terms in order to explain their invention in the best way.

[0027] 〔First Embodiment〕 Referring to FIG. 1 for explanation, as a first embodiment of the present invention, the secondary battery module frame 10 can include a main body 100 and an exposure hole 200.

[0028] The main body 100 can form the overall external shape of the secondary battery module frame 10, and an accommodation space can be formed inside so that the secondary battery 500 can be accommodated.

[0029] The storage space of the main unit 100 can accommodate multiple secondary batteries 500, and the multiple secondary batteries 500 housed in the storage space can be arranged in a predetermined arrangement method.

[0030] The main body 100 can be formed from a durable material that will not be damaged by the heat generated by the secondary battery 500, and may include, but is not limited to, one or more polymer materials such as polypropylene (PP), polycarbonate (PC), ABS resin, polyethylene terephthalate (PET), polyethylene (PE), acrylic resin, and polyvinyl chloride (PVC).

[0031] Referring to Figure 2, the exposure hole 200 can be formed to penetrate one side of the main body 100 so that the housing space of the main body 100 can be exposed to the outside. Multiple secondary batteries 500 housed in the housing space can be exposed through the exposure hole 200. More specifically, the exposure hole 200 is formed to penetrate one side of the main body 100 that faces the positive electrode terminal of the secondary battery 500 housed in the main body 100, and the exposure hole 200 allows the electrode terminal to be exposed to the outside when the secondary battery 500 is housed in the housing space of the main body 100. Therefore, it is possible to determine whether the secondary battery 500 housed in the housing space is correctly positioned and to determine the position of the positive and negative electrode terminals through the exposure hole 200 formed on one side of the main body 100.

[0032] The exposed hole 200 can be any shape that penetrates the main body 100 so that the housing space is exposed to the outside, and can be, for example, a square, circle, ellipse, or semicircle.

[0033] Multiple exposure holes 200 can be formed on one surface of the main body 100 so as to expose each of the multiple secondary batteries 500 housed in the containment space.

[0034] Multiple exposure holes 200 can form a line of one or more exposure holes 200 in a row along a first direction a on one surface of the main body 100. Since the line of exposure holes 200 is aligned in the direction in which the secondary batteries 500 arranged in the housing space are lined up, it is possible to verify through the exposure holes 200 whether the placement of each of the multiple secondary batteries 500 is correct, and the electrode terminals of the multiple secondary batteries 500 arranged along the line of exposure holes 200 can be exposed to the outside.

[0035] Multiple lines of exposure holes 200 can be formed, and multiple lines of exposure holes 200 can be arranged in a second direction b perpendicular to a first direction a.

[0036] Referring to Figure 2, the exposure hole 200 can have a non-reflective area 210 formed along the periphery of its inner surface, which diffusely reflects light incident on the inner surface of the exposure hole 200. The inner surface of the exposure hole 200 can form the boundary of the exposure hole 200.

[0037] A busbar groove 300 recessed to a predetermined depth can be formed on one surface of the main body 100 so that a busbar can be inserted at a position adjacent to the exposed hole line. The busbar groove 300 can be formed between a plurality of adjacent exposed hole lines. The busbar groove 300 can be formed along the first direction a, like the exposed hole line.

[0038] The non-reflective area 210 diffusely reflects light incident on the inner surface of the exposure hole 200 in all directions, making it a darker and less glossy area than the area around the exposure hole 200.

[0039] When manufacturing a secondary battery module 11, it is necessary to confirm that the secondary batteries 500 are correctly arranged in the housing space of the secondary battery module frame 10. This can be done by visual inspection by a worker or by using a vision inspection device. The vision inspection device can automatically determine, through images or videos generated by photographing the secondary battery module 11 during manufacturing, whether the secondary batteries 500 placed in the housing space of the secondary battery module frame 10 are correctly arranged, the positions of the negative and positive electrode terminals of the secondary batteries 500, the boundary between the negative and positive electrode terminals of the secondary batteries 500, and the appropriate positions for joining the wires 700 to the electrode terminals of the secondary batteries 500. In particular, the vision inspection device can obtain image data regarding the interface of the exposure hole 200 and the appearance of the secondary batteries 500 exposed through the exposure hole 200 by photographing the exposure hole 200.

[0040] However, when the vision inspection device photographs an exposure hole 200 that does not have a non-reflective area 210 on its inner surface, light reflection occurs due to the inner surface of the exposure hole 200, and the reflected light flows into the vision inspection device. As a result, the image or video generated by the vision inspection device may show the boundary of the exposure hole 200 in an unclear manner, such as blurring or showing it doubled.

[0041] The non-reflective section 210 solves these problems by diffusely reflecting the light incident on it, thereby minimizing the amount of light reflected from the non-reflective section 210 that flows into the vision inspection device. The image or video generated by the vision inspection device will show the non-reflective section 210, which forms the boundary of the exposure hole 200, as dark, thereby clearly indicating the boundary of the exposure hole 200.

[0042] Referring to Figure 3, the non-reflective area 210 can have a first uneven surface 211 formed on its surface, which has an irregular shape and pattern, so that it can diffusely reflect light incident on the non-reflective area 210. The first uneven surface 211 can have an average surface roughness (Ra) of 0.35 μm to 3.00 μm, so that the boundary of the exposed hole 200 appears clearly and reliably in the image or video generated by the vision inspection device.

[0043] The first uneven surface 211 can have numerous irregular protrusions and grooves formed in an irregular pattern, and the size of the irregular protrusions and grooves can be formed to satisfy an average surface roughness (Ra) of 0.35 μm to 3.00 μm.

[0044] Because the non-reflective area 210 diffusely reflects incident light, it is formed with lower brightness compared to the surface adjacent to the exposure hole 200. This solves the problem of the boundary of the exposure hole 200 becoming unclear due to light reflected from the non-reflective area 210 in images or videos captured and generated by the vision inspection device.

[0045] The main body 100 can be manufactured by melting and injecting a polymer material between a first mold 400 and a second mold 420, and then cooling it. Here, the exposed groove can be injection molded using a first mold 400 in which a protruding portion 410 protruding to a predetermined height on one surface is formed, and a second mold 420 in which a shape corresponding to the shape of the end of the protruding portion 410 is formed so that the protruding portion 410 is inserted.

[0046] The protruding portion 410 can have a second uneven surface 411 formed on its surface along the periphery of its outer surface. The average surface roughness of the second uneven surface 411 can be 0.35 μm to 3.00 μm.

[0047] The second uneven surface 411 is formed in an irregular pattern, and numerous irregular protrusions and grooves can be formed in an irregular pattern, and the irregular protrusions and grooves can be formed in a size that satisfies an average surface roughness of 0.35 μm to 3.00 μm.

[0048] Referring to Figure 4, the exposed hole 200 can be injection molded using a second mold 420 which has a protrusion 410 formed in the first mold 400 and a groove into which the end of the protrusion 410 can be inserted. The first uneven surface 211 formed on the outer surface of the non-reflective portion 210 can be injection molded using a second uneven surface 411 formed on the outer surface of the protrusion 410. In other words, the first uneven surface 211 can be formed as a surface corresponding to the second uneven surface 411.

[0049] The surface that forms the roughness of the second uneven surface 411 formed on the surface of the protrusion 410 can be formed by various methods. Although not limited thereto, for example, the second uneven surface 411 can be formed by chemically corroding the outer surface of the protrusion 410 to form a number of irregular protrusions and irregular grooves on the surface of the protrusion 410, or by electrically discharging the surface of the protrusion 410.

[0050] [Second Embodiment] Referring to Figure 5, in a second embodiment of the present invention, the secondary battery module 11 may include a secondary battery 500, a main body 100, and an exposure hole 200.

[0051] The secondary battery module 11 may further include a busbar 600 and wires 700.

[0052] The secondary battery module 11 can refer to a state in which multiple secondary batteries 500 are housed in a secondary battery module frame 10, and the details regarding the secondary battery module frame 10 can be based on the details described in the first embodiment above.

[0053] The secondary battery 500 can be in various forms, such as pouch type, rectangular type, or cylindrical type, and is preferably a cylindrical secondary battery.

[0054] The cylindrical secondary battery 500 may include a battery casing (not shown), a cap assembly (not shown), and an electrode assembly (not shown).

[0055] The cap assembly seals the opening of the battery can and may include a positive electrode terminal and a safety vent.

[0056] The positive electrode terminal can be electrically connected to the positive electrode pin of the electrode assembly described later to form a positive electrode. The positive electrode terminal may be located in the center of the cap assembly and may have a shape that protrudes outward from the secondary battery 500.

[0057] A safety vent is designed to release high-pressure gas from inside a secondary battery when an abnormal current causes the internal pressure to rise, by rupturing and venting the gas to the outside of the battery. Safety vents can be made by incorporating metal materials.

[0058] The battery can be a cylindrical can with an opening formed on one side and a storage space formed inside. The electrode assembly and electrolyte are housed in the storage space, and a cap assembly is attached to the opening to seal the battery can.

[0059] Battery casings can be made from conductive metal materials such as aluminum, nickel, stainless steel, or alloys thereof.

[0060] The upper end of the battery can can have a beading section recessed from the outside to the inside, and a crimping section for sealing the battery can.

[0061] The electrode assembly may include a structure in which a positive electrode current collector / positive electrode active material layer / separator / negative electrode active material layer / negative electrode current collector is stacked in that order. The positive electrode current collector includes a region coated with the positive electrode active material layer and an uncoated positive electrode plain region, the plain region of which can function as a positive electrode tab. The negative electrode current collector includes a region coated with the negative electrode active material layer and an uncoated negative electrode plain region, the plain region of which can function as a negative electrode tab. A separator is placed between the positive electrode current collector and the negative electrode current collector to prevent contact between current collectors of different polarities. The electrode assembly may include a jelly roll formed by winding the stacked structure.

[0062] The electrode assembly formed by the jelly roll can be electrically connected to the cap assembly by joining the positive electrode pin at the upper end of the blank positive electrode portion, and electrically connected to the battery can by joining the negative electrode pin at the lower end of the blank negative electrode portion. The battery can, electrically connected to the negative electrode pin, can itself become the negative electrode terminal.

[0063] In other words, the electrode terminals can refer to the positive electrode terminal of the cap assembly and the battery can itself, which is the negative electrode terminal.

[0064] The secondary battery 500 can be housed in the housing space of the main body such that its positive electrode terminal faces the exposed hole 200.

[0065] The busbar 600 can be formed from an electrically conductive metal material to electrically connect multiple secondary batteries 500 and circuit boards, etc.

[0066] The busbar 600 can be positioned on one surface of the main body 100. More specifically, the busbar 600 can be inserted into a busbar groove 300 formed on one surface of the main body 100 to a predetermined depth. The depth of the busbar groove 300 can be the same as or similar to the thickness of the busbar 600.

[0067] The busbar 600 can be positioned adjacent to the exposure holes 200 so as to be easily connected to the secondary battery 500 via the exposure holes 200. More specifically, the busbar 600 can be positioned between the line of any one of the exposure holes 200 and the line of the nearest adjacent exposure hole 200, and can be positioned along the line of the exposure holes 200 with the first direction a, which is the orientation direction of the lines of the exposure holes 200, as the longitudinal direction.

[0068] The busbar 600 may consist of multiple busbars 600, which may be arranged between each line of exposure holes 200 and adjacent lines of exposure holes 200 along a second direction b which is perpendicular to the first direction a.

[0069] The busbar 600 can be formed in a rectangular shape with a width narrower than its length so that it is positioned along the line of the exposed hole 200.

[0070] The busbar 600 can be electrically connected to the electrode terminals of the secondary battery 500, which are exposed through the exposed holes 200, via wires 700. Since the busbar 600 is formed in the shape of a long rectangle along the longitudinal direction of the line of exposed holes 200, multiple wires 700 passing through each of the exposed holes 200 that make up the line of exposed holes 200 can be joined.

[0071] Referring to Figure 6, the wire 700 can pass through the exposed hole 200, connect one end to the electrode terminal of the secondary battery 500, and connect the other end to the busbar 600, thereby electrically connecting the busbar 600 and the electrode terminal of the secondary battery 500.

[0072] The wire 700 can be formed from an electrically conductive metal material to electrically connect the busbar 600 and the secondary battery 500.

[0073] The wire 700 can be joined to the busbar 600 and the secondary battery 500 by methods such as welding or soldering.

[0074] A wire 700 connected to the positive electrode terminal of the secondary battery 500 can pass through the exposed hole 200 and be connected to a busbar 600 located on one side of the exposed hole 200, and a wire 700 connected to the negative electrode terminal of the secondary battery 500 can pass through the exposed hole 200 and be connected to a busbar 600 located on the other side of the exposed hole 200.

[0075] The wire 700 can be joined either by an operator directly observing the exposed hole 200, or by a wire joining device. One end of the wire 700 can be joined to the inner surface of the exposed hole 200 at a predetermined distance inward from the surface extending toward the secondary battery 500.

[0076] Referring to Figures 7(a) and 7(b), when the wire joining device joins one end of a wire 700 to the electrode terminals of a secondary battery 500, the joining position is determined via an image or video generated by a vision inspection device, and the position where the wire 700 is joined can be determined as a pre-inputted position within the electrode terminal area of ​​the secondary battery 500 exposed through the exposure hole 200. More specifically, since the position where the wire 700 is joined is input to the wire joining device as a position separated by a predetermined distance inward from the inner surface of the exposure hole 200, if the boundary of the exposure hole 200 becomes unclear in the image or video generated by the vision inspection device, the wire joining device may not be able to accurately calculate the position where the wire 700 is joined, and errors may occur in the process of joining the wire 700. Furthermore, in the cylindrical secondary battery 500, both the positive terminal of the cap assembly and the negative electrode terminal of the battery can face the exposed hole 200. When the wire 700 is connected to the electrode terminal, if it is not connected precisely to the specific position of the target electrode terminal, a problem may occur in which the negative and positive electrodes short-circuit.

[0077] The vision inspection device can be positioned to photograph one surface of the secondary battery module 11 from directly above the surface on which the exposure hole 200 is formed. Since the vision inspection device photographs the exposure hole 200 from above, in the image or video of the exposure hole 200 generated by the vision inspection device, the inner surface of the exposure hole 200 can form the boundary of the exposure hole 200. Therefore, a non-reflective area 210 can be formed along the periphery of the inner surface of the exposure hole 200, which diffusely reflects the incident light, so that the boundary of the exposure hole 200 is clearly shown in the image or video.

[0078] The non-reflective area 210 diffusely reflects incident light, appearing darker in the image or video generated by the vision inspection device compared to the area outside the exposure hole 200, thus forming a clear boundary for the exposure hole 200. Furthermore, the non-reflective area 210 does not interfere with the light reflected from the electrode terminal area of ​​the secondary battery 500 located in the area inside the exposure hole 200 in the image or video generated by the vision inspection device, allowing the appearance of the electrode terminals of the secondary battery 500 to be clearly shown in the image or video without distortion. As a result, the wire joining device can calculate the position where one end of the wire 700 is joined to the electrode terminal of the secondary battery 500, and can accurately join the wire 700 to that position.

[0079] [Third Embodiment] As a third embodiment of the present invention, the vision system may include a secondary battery module (secondary battery module frame 10, secondary battery module 11) and a vision device (not shown). Detailed information regarding the secondary battery modules 10 and 11 can be found by referring to the first and second embodiments described above.

[0080] A vision device (not shown) can be configured to capture one side of a secondary battery module (secondary battery module frame 10, secondary battery module 11) and output a visual image. The image captured and displayed by the vision device can show multiple exposure holes, the arrangement of secondary batteries visible through the multiple exposure holes, and the regions of electrode leads. A wire joining device can recognize the interface of the exposure holes, the region of the positive electrode lead, and the region of the negative electrode from the image captured by the vision device, and can join wires to the electrode lead regions calculated in advance from the recognized interface of the exposure holes.

[0081] Figure 7(a) shows an actual image captured by the vision device of an exposure hole when the inner surface of the exposure hole is illuminated, and Figure 7(b) shows an actual image captured by the vision device of an exposure hole when a non-illuminated area is formed on the inner surface of the exposure hole. In Figure 7(a), the boundaries of the exposure hole appear to overlap on the image, making the boundaries unclear, but in Figure 7(b), it can be seen that the boundaries of the exposure hole 200 have become clear because light is diffusely reflected by the non-illuminated area 210 formed along the periphery of the inner surface of the exposure hole 200.

[0082] Although the present invention has been described above with reference to limited embodiments and drawings, the present invention is not limited thereto, and various implementations are possible by persons with ordinary skill in the art to which the present invention pertains, within the equivalent scope of the technical concept of the present invention and the claims described below. [Explanation of Symbols]

[0083] 10 Secondary battery module frame 11. Secondary battery module 100 Main Unit 200 Exposed Holes 210 No light area 211 First uneven surface 300 Busbar Grooves 400 First mold 410 Protrusion 411 2nd uneven surface 420 Second mold 500 secondary battery 600 Bus Bar 700 wire a First direction b Second direction

Claims

1. The main body has an internal storage space, Multiple exposed holes are provided that penetrate one side of the main body and expose the housing space, Includes, A secondary battery module frame, wherein the exposure hole has a non-reflective portion formed along the periphery of the inner surface of the exposure hole, which diffusely reflects light incident on the inner surface of the exposure hole.

2. The secondary battery module frame according to claim 1, wherein the non-reflective portion has a first uneven surface with an irregular pattern.

3. The secondary battery module frame according to claim 2, wherein the average surface roughness of the first uneven surface is 0.35 μm to 3.00 μm.

4. The secondary battery module frame according to claim 2, wherein the non-reflective portion has a lower luminance than the surface adjacent to the exposure hole.

5. The multiple exposure holes form multiple exposure hole lines on one surface of the main body, in which the exposure holes are arranged in a line along a first direction. The secondary battery module frame according to claim 1, wherein the plurality of exposed hole lines are arranged in a second direction perpendicular to the first direction.

6. The secondary battery module frame according to claim 5, wherein a busbar groove recessed to a predetermined depth along the first direction is formed between the exposure hole line and the adjacent exposure hole line.

7. The exposed hole is injection molded using a mold in which a protrusion is formed on one surface to form the exposed hole. The secondary battery module frame according to claim 2, wherein a second uneven surface is formed on the protruding portion along the periphery of the outer surface.

8. The secondary battery module frame according to claim 7, wherein the first uneven surface is formed as a surface corresponding to the second uneven surface.

9. The secondary battery module frame according to claim 7, wherein the second uneven surface has an average surface roughness of 0.35 μm to 3.00 μm.

10. The secondary battery module frame according to claim 9, wherein the second uneven surface is formed by chemically corroding the surface of the protruding portion.

11. The secondary battery module frame according to claim 9, wherein the second uneven surface is formed by electrically discharging the surface of the protruding portion.

12. Multiple rechargeable batteries, The main body contains the aforementioned multiple secondary batteries in an internal storage space, Multiple exposed holes penetrate one side of the main body, through which the electrode terminals of the secondary battery are exposed, Includes, A secondary battery module wherein the exposure hole has a non-reflective portion formed along the periphery of the inner surface of the exposure hole, which diffusely reflects light incident on the inner surface of the exposure hole.

13. The invention further includes a wire, one end of which is joined to the electrode terminal of the secondary battery, The secondary battery module according to claim 12, wherein the wire is joined at a position a predetermined distance away from the inner surface of the exposed hole in an inward direction.

14. The secondary battery module according to claim 13, further comprising a busbar located on one surface of the main body and arranged adjacent to the exposure hole.

15. The secondary battery module according to claim 14, wherein the wire passes through the exposed hole and its other end is joined to the busbar.

16. A secondary battery module and A vision device that photographs one side of the aforementioned secondary battery module and outputs a visual image, Includes, The aforementioned secondary battery module is The main body has an internal storage space, Multiple exposed holes are provided that penetrate one side of the main body and expose the housing space, Includes, A vision system in which the exposure hole has a non-reflective portion formed along the periphery of the inner surface of the exposure hole, which diffusely reflects light incident on the inner surface of the exposure hole.

Images