Secondary battery module frame and secondary battery module including same

Abstract

The present invention relates to a secondary battery module frame, and provides a secondary battery module frame comprising: a main body in which an accommodation space is formed; and a plurality of exposure holes passing through one surface of the main body and allowing the accommodation space to be exposed therethrough, in which the exposure holes have matte portions formed along peripheries of inner side surfaces of the exposure holes and diffusely reflecting light incident on the inner side surfaces of the exposure holes.

Description

Technical Field

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority from Korean Patent Application No. 10-2023-0092516 filed in Korea on Jul. 17, 2023, the disclosure of which is incorporated herein by reference. Technical Field

[0003] The present disclosure 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 exposure hole of the secondary battery module frame and a secondary battery module including the same. Background Art

[0004] Secondary batteries are batteries that can be charged and discharged, unlike primary batteries, which cannot be charged. Secondary batteries are highly suitable for a wide range of product groups and have the electrical characteristics of high energy density. Such secondary batteries are used not only in portable electronic devices, but also in electric vehicles, hybrid electric vehicles, power storage devices, etc. that are driven by power sources. Secondary batteries have attracted much attention as a new energy source that improves eco-friendliness and energy efficiency because they not only have the major advantage of significantly reducing the use of fossil fuels, but also do not produce byproducts from the use of energy.

[0005] Medium and large-sized devices such as electric vehicles require high-power, large-capacity secondary batteries and use multiple secondary battery modules that electrically connect multiple secondary batteries. Such secondary battery modules are preferably manufactured with the smallest possible size and weight, and primarily use prismatic, pouch-type, and cylindrical secondary batteries, which have a small weight-to-capacity ratio.

[0006] Furthermore, the manufacturing process for secondary battery modules is automated, and the secondary battery module manufacturing equipment uses a vision system to ensure visual images before executing the process. In particular, in the manufacturing process for cylindrical secondary battery modules, the wire bonding process, which connects electrode terminals and bus bars, is performed through small holes formed in the secondary battery module. This requires precise work, but there is a problem that the image captured by the vision system cannot clearly identify the boundary surface of the hole due to light reflected from the hole, resulting in errors in the wire bonding position. Therefore, there is a need to develop a technology to address this problem. Summary of the Invention

[0007] Technical issues

[0008] The present disclosure aims to solve the above-mentioned problems. Therefore, the present disclosure aims to provide a secondary battery module frame and a secondary battery module including the secondary battery module frame, which diffusely reflects light incident on the inner surface of the exposure hole to clearly form the boundary of the internal area of ​​the exposure hole exposing the accommodating space in an image or video generated by photographing the secondary battery module frame using a photographing device.

[0009] Technical Solution

[0010] As embodiment 1 of the present disclosure, the present disclosure provides a secondary battery module frame, which includes: a main body having an accommodation space formed therein; and a plurality of exposure holes that pass through a surface of the main body and are arranged to expose the accommodation space, wherein a matte portion is formed in the exposure hole, which is formed along the periphery of the inner surface of the exposure hole and diffusely reflects light incident on the inner surface of the exposure hole.

[0011] In addition, in the matte portion, a first uneven surface having an irregular pattern may be formed.

[0012] In addition, the first uneven surface may have an average surface roughness of 0.35 μm to 3.00 μm.

[0013] Additionally, the matte portion may have lower luminance compared to the surface adjacent to the exposure hole.

[0014] In addition, the plurality of exposure holes may form a plurality of exposure hole lines on one surface of the body, in which the exposure holes are arranged in a row along a first direction, and the plurality of exposure hole lines may be arranged along a second direction perpendicular to the first direction.

[0015] In addition, a bus bar groove recessed to a predetermined depth along the first direction may be formed between the exposed perforated line and an adjacent exposed perforated line.

[0016] In addition, the exposure hole may be injection-molded by a mold having a protrusion for forming the exposure hole formed on one surface, and in the protrusion, the second uneven surface may be formed along the circumference of the outer surface.

[0017] In addition, the first uneven surface may be formed as a surface corresponding to the second uneven surface.

[0018] In addition, the second uneven surface may have an average surface roughness of 0.35 μm to 3.00 μm.

[0019] Alternatively, the second uneven surface may be formed by chemically etching the surface of the protrusion.

[0020] Alternatively, the second uneven surface may be formed by performing electrical discharge machining on the surface of the protrusion.

[0021] As embodiment 2 of the present disclosure, the present disclosure provides a secondary battery module, which includes: a plurality of secondary batteries; a main body, which accommodates the plurality of secondary batteries in an internal accommodation space; and a plurality of exposure holes, which pass through a surface of the main body and expose electrode terminals of the secondary batteries, wherein a matte portion is formed in the exposure hole, which is formed along the periphery of the inner surface of the exposure hole and diffusely reflects light incident on the inner surface of the exposure hole.

[0022] In addition, the secondary battery module may further include a lead having one end coupled to an electrode terminal of the secondary battery, wherein the lead is coupled to a position spaced a predetermined distance in an inward direction from an inner surface of the exposure hole.

[0023] In addition, the secondary battery module may further include a bus bar positioned on one surface of the body and disposed adjacent to the exposure hole.

[0024] In addition, the lead wire may pass through the exposure hole, and the other end of the lead wire may be bonded to the bus bar.

[0025] Beneficial effects

[0026] In the secondary battery module frame disclosed herein, a matte portion that diffusely reflects light is formed on the inner surface of the exposure hole that exposes the internal accommodating space, so that during the manufacturing process of the secondary battery module, the quality of the image can be improved by making the boundary of the exposure hole in the image of the secondary battery module taken by a visual inspection device clear, and in the process of joining the lead to the electrode terminal of the secondary battery through the exposure hole, the accuracy of the joining position of the lead on the electrode terminal can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a perspective view showing the external shape of a secondary battery module frame according to Embodiment 1 of the present disclosure.

[0028] Figure 2 This is a diagram showing the embodiment 1 according to the present disclosure. Figure 1 An enlarged perspective view of area "A".

[0029] Figure 3 is a cross-sectional view schematically illustrating a first uneven surface formed on a matte portion according to Embodiment 1 of the present disclosure.

[0030] Figure 4 is a cross-sectional view showing a state where a matte portion is injection-molded by a first mold and a second mold.

[0031] Figure 5 is a perspective view showing a secondary battery module according to Embodiment 2 of the present disclosure.

[0032] Figure 6 This is a diagram showing the second embodiment of the present disclosure. Figure 5 An enlarged perspective view of area "B".

[0033] Figure 7 are images generated by actually photographing the exposure hole using a visual inspection device, wherein (a) is an image showing that the boundary of the exposure hole is unclear without the matte portion, and (b) is an image showing that the boundary of the exposure hole is clear by forming a matte portion on the inner surface of the exposure hole. DETAILED DESCRIPTION

[0034] Hereinafter, the preferred embodiments of the present disclosure will be described in sufficient detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present disclosure. However, the present disclosure can be implemented in many different forms and is not limited or restricted by the following embodiments.

[0035] In order to clearly describe the present disclosure, irrelevant descriptions or detailed descriptions of related known technologies that may unnecessarily obscure the main purpose of the present disclosure are omitted, and when adding figure marks to elements in each drawing, the same or similar figure marks are added to the same or similar elements throughout the specification.

[0036] In addition, it should be understood that the terms or words used in the specification and the appended claims should not be interpreted as limited to the general and dictionary meanings, but should be interpreted based on the meanings and concepts corresponding to the technical aspects of the present disclosure on the basis of the principle of allowing the inventor to appropriately define the terms to obtain the best interpretation.

[0037] Implementation Method 1

[0038] Reference Figure 1 , as Embodiment 1 of the present disclosure, the secondary battery module frame 10 may include a body 100 and an exposure hole 200 .

[0039] The body 100 may form an overall outer shape of the secondary battery module frame 10 and may form therein an accommodation space for accommodating the secondary battery 500 .

[0040] A plurality of secondary batteries 500 may be accommodated in the accommodation space of the main body 100 , and the plurality of secondary batteries 500 accommodated in the accommodation space may be arranged according to a predetermined arrangement method.

[0041] The main body 100 may be formed of a durable material so as not to be damaged by the heat generated by the secondary battery 500, and may include, for example, but not limited to, one or more polymer materials among polypropylene (PP), polycarbonate (PC), ABS resin, polyethylene terephthalate (PET), polyethylene (PE), acrylic resin, and polyvinyl chloride (PVC).

[0042] Reference Figure 2 , the exposure hole 200 may be formed through one surface of the main body 100 so as to expose the accommodation space of the main body 100 to the outside. The plurality of secondary batteries 500 accommodated in the accommodation space may be exposed through the exposure hole 200. More specifically, the exposure hole 200 is formed through one surface of the main body 100 facing the positive terminal of the secondary battery 500 accommodated in the main body 100, and when the secondary battery 500 is accommodated in the accommodation space of the main body 100, the exposure hole 200 may expose the electrode terminal to the outside. Therefore, whether the secondary battery 500 accommodated in the accommodation space is properly arranged and the positions of the positive and negative electrode terminals can be identified through the exposure hole 200 formed on one surface of the main body 100.

[0043] The exposure hole 200 may have any shape as long as it passes through the body 100 to expose the accommodation space to the outside, and may be, for example, rectangular, circular, elliptical, semicircular, or the like.

[0044] The exposure hole 200 may be formed in plural on one surface of the body 100 to expose each of the plurality of secondary batteries 500 accommodated in the accommodation space.

[0045] The plurality of exposure holes 200 may form one or more lines of exposure holes 200 in a row along the first direction a on one surface of the body 100. Since the line of exposure holes 200 is arranged along the direction in which the secondary batteries 500 disposed in the accommodation space are arranged in a row, it is possible to check whether each of the plurality of secondary batteries 500 is correctly positioned through the exposure holes 200, and the electrode terminals of the plurality of secondary batteries 500 arranged along the line of exposure holes 200 may be exposed to the outside.

[0046] The exposure hole 200 line may be formed in plural, and the plurality of exposure hole 200 lines may be arranged in a second direction b perpendicular to the first direction a.

[0047] Reference Figure 2 In the exposure hole 200, a matte portion 210 may be formed along a periphery of an inner surface of the exposure hole 200 and diffusely reflects light incident on the inner surface of the exposure hole 200. The inner surface of the exposure hole 200 may form a boundary of the exposure hole 200.

[0048] A busbar groove 300 recessed to a predetermined depth may be formed on one surface of the main body 100 so that a busbar can be inserted into a position adjacent to the exposed perforation line. The busbar groove 300 may be formed between a plurality of adjacent exposed perforation lines. The busbar groove 300 may be formed along a first direction a, similar to the exposed perforation line.

[0049] Since the matte portion 210 diffusely reflects light incident on the inner surface of the exposure hole 200 in all directions, the matte portion 210 may be a region that is darker and less shiny than the surrounding area of ​​the exposure hole 200 .

[0050] When manufacturing the secondary battery module 11, it is necessary to check whether the secondary battery 500 is accurately arranged in the accommodation space of the secondary battery module frame 10, which can be performed by direct visual inspection by an operator or by a visual inspection device. The visual inspection device can automatically determine whether the secondary battery 500 set in the accommodation space of the secondary battery module frame 10 is accurately arranged, the position of the negative and positive electrode terminals of the secondary battery 500, the boundary between the negative and positive electrode terminals of the secondary battery 500, and the appropriate position where the lead 700 will be joined to the electrode terminal of the secondary battery 500 by photographing the exposure hole 200. In particular, the visual inspection device can obtain image data related to the boundary surface of the exposure hole 200 and the appearance of the secondary battery 500 exposed by the exposure hole 200 by photographing the exposure hole 200.

[0051] However, when the visual inspection device photographs the exposure hole 200 without the matte portion 210 on the inner surface, light reflection occurs on the inner surface of the exposure hole 200, and the reflected light flows into the visual inspection device, so that the image or video generated by the visual inspection device may be unclear, such as the boundary of the exposure hole 200 is blurred or repeatedly represented.

[0052] To address this issue, the matte portion 210 can diffusely reflect light incident on the matte portion 210 to minimize the amount of light reflected from the matte portion 210 entering the visual inspection device, so that the image or video generated by the visual inspection device can darken the matte portion 210 forming the boundary of the exposure hole 200, thereby clearly indicating the boundary of the exposure hole 200.

[0053] Reference Figure 3 In the matte portion 210, a first uneven surface 211 having an irregular shape and pattern on its surface may be formed to diffusely reflect light incident on the matte portion 210. The first uneven surface 211 may have an average surface roughness Ra of 0.35 μm to 3.00 μm, which may form a matte surface so that the boundary of the exposure hole 200 appears clearly and distinctly in an image or video generated by a visual inspection device.

[0054] The first uneven surface 211 may be formed in an irregular pattern of a plurality of atypical protrusions and atypical grooves, and the atypical protrusions and atypical grooves may be formed in a size satisfying an average surface roughness Ra of 0.35 μm to 3.00 μm.

[0055] Since the matte portion 210 diffusely reflects incident light, it forms a lower brightness compared to the surface adjacent to the exposure hole 200, which can solve the problem that the boundary of the exposure hole 200 becomes unclear due to the light reflected from the matte portion 210 in the image or video generated by the visual inspection device.

[0056] The 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. In this case, the exposed groove can be injection-molded by the first mold 400 and the second mold 420, wherein the protrusion 410 protruding at a predetermined height on one surface is formed in the first mold 400, and the shape corresponding to the shape of the end of the protrusion 410 is formed in the second mold 420 so that the protrusion 410 can be inserted.

[0057] In the protrusion 410, a second uneven surface 411 may be formed on the surface along the circumference of the outer surface. The second uneven surface 411 may have an average surface roughness of 0.35 μm to 3.00 μm.

[0058] The second uneven surface 411 may be formed in an irregular pattern, and a plurality of atypical protrusions and atypical grooves may be formed in an irregular pattern, and the atypical protrusions and atypical grooves may be formed in a size satisfying an average surface roughness of 0.35 μm to 3.00 μm.

[0059] Reference Figure 4 , the exposure hole 200 may be injection molded by a protrusion 410 formed in the first mold 400 and a second mold 420 having a groove into which an end of the protrusion 410 may be inserted, and the first uneven surface 211 formed on the outer surface of the matte portion 210 may be injection molded by a second uneven surface 411 formed on the outer surface of the protrusion 410. That is, the first uneven surface 211 may be formed as a surface corresponding to the second uneven surface 411.

[0060] The rough surface of the second uneven surface 411 formed on the surface of the protrusion 410 may be formed by various methods. For example, the second uneven surface 411 may be formed by chemically etching the outer surface of the protrusion 410 to form a plurality of atypical protrusions and atypical grooves on the surface of the protrusion 410, or by electrical discharge machining the surface of the protrusion 410, but is not limited thereto.

[0061] Implementation Method 2

[0062] Reference Figure 5 As Embodiment 2 of the present disclosure, the secondary battery module 11 may include a secondary battery 500 , a body 100 , and an exposure hole 200 .

[0063] In addition, the secondary battery module 11 may further include a bus bar 600 and a lead 700 .

[0064] The secondary battery module 11 may refer to a state in which a plurality of secondary batteries 500 are accommodated in the secondary battery module frame 10 , and the contents regarding the secondary battery module frame 10 may be replaced with those described in the above-mentioned Embodiment 1.

[0065] The secondary battery 500 may have various shapes such as a pouch type, a prismatic shape, and a cylindrical shape, and may preferably be a cylindrical secondary battery.

[0066] The cylindrical secondary battery 500 may include a battery can (not shown), a cap assembly (not shown), and an electrode assembly (not shown).

[0067] The cap assembly seals the opening of the battery can and may include a positive terminal and a safety vent.

[0068] The positive terminal may be electrically connected to a positive electrode pin of an electrode assembly described later to form a positive electrode. The positive terminal may have a shape located at the center of the cap assembly and protruding toward the outside of the secondary battery 500.

[0069] When high-pressure gas is generated inside the secondary battery due to abnormal current and the internal pressure rises, the safety vent may rupture and discharge the gas to the outside of the secondary battery.The safety vent may be formed to include a metal material.

[0070] The battery can may be a cylindrical can having an opening formed on one surface and an accommodation space formed therein, the electrode assembly and the electrolyte may be accommodated in the accommodation space, and the cap assembly may be coupled to the opening to seal the battery can.

[0071] The battery can may be formed of a conductive metal material such as aluminum, nickel, stainless steel, or alloys thereof.

[0072] A bead portion recessed from the outside of the battery can toward the inside and a press-fit portion for sealing the battery can may be formed on the top of the battery can.

[0073] The electrode assembly may include a structure stacked in the following order: positive electrode collector / positive electrode active material layer / separator / negative electrode active material layer / negative electrode collector. The positive electrode collector includes a region coated with the positive electrode active material layer and an uncoated positive electrode uncoated region, and the positive electrode uncoated region can be used as a positive electrode tab. The negative electrode collector includes a region coated with the negative electrode active material layer and an uncoated negative electrode uncoated region, and the negative electrode uncoated region can be used as a negative electrode tab. The separator may be provided between the positive electrode collector and the negative electrode collector to prevent current collectors of different polarities from contacting each other. The electrode assembly may include a core roll formed by winding the stacked structure.

[0074] In the electrode assembly formed into a core roll, the upper end of the positive electrode uncoated portion can be joined to the positive electrode pin for electrical connection to the cap assembly, and the lower end of the negative electrode uncoated portion can be coupled to the negative electrode pin for electrical connection to the battery can. The battery can itself, electrically connected to the negative electrode pin, can become the negative terminal.

[0075] That is, the electrode terminal may refer to the positive terminal of the cap assembly and the battery can itself as the negative terminal.

[0076] The secondary battery 500 may be accommodated in the accommodation space of the body such that the positive terminal faces the exposure hole 200 .

[0077] The bus bar 600 may be formed of a conductive metal material to electrically connect the plurality of secondary batteries 500 and the circuit board.

[0078] The bus bar 600 may be located on one surface of the body 100. More specifically, the bus bar 600 may be inserted into the bus bar groove 300 formed to be recessed to a predetermined depth on one surface of the body 100. The depth of the bus bar groove 300 may be formed to be the same as or similar to the thickness of the bus bar 600.

[0079] The bus bar 600 may be disposed adjacent to the exposure holes 200 to easily connect to the secondary battery 500 through the exposure holes 200. More specifically, the bus bar 600 may be disposed between any one exposure hole 200 line and the exposure hole 200 line closest thereto, or may be disposed along the exposure hole 200 line with the first direction a, which is the arrangement direction of the exposure hole 200 line, as the length direction.

[0080] The bus bar 600 may be provided in plural, and the plural bus bars 600 may be respectively disposed between each exposure hole 200 line and the exposure hole 200 line adjacent thereto along a second direction b perpendicular to the first direction a.

[0081] The bus bar 600 may be formed in a rectangular shape having a narrow width relative to its length so that it may be disposed along the exposure hole 200 line.

[0082] The bus bar 600 can be electrically connected to the electrode terminals of the secondary battery 500 exposed through the exposure holes 200 through the lead wires 700. Since the bus bar 600 is formed in a long rectangular shape along the length direction of the exposure hole 200 line, a plurality of lead wires 700 passing through the exposure holes 200 forming the exposure hole 200 line can be joined.

[0083] Reference Figure 6 The lead wire 700 passes through the exposure hole 200 so that one end thereof can be coupled to the electrode terminal of the secondary battery 500 and the other end thereof can be coupled to the bus bar 600 , thereby electrically connecting the bus bar 600 and the electrode terminal of the secondary battery 500 .

[0084] The lead 700 may be formed of a conductive metal material to electrically connect the bus bar 600 and the secondary battery 500 .

[0085] The lead 700 may be joined to the bus bar 600 and the secondary battery 500 by welding, soldering, or the like.

[0086] The lead 700 coupled to the positive terminal of the secondary battery 500 may pass through the exposure hole 200 and be coupled to the bus bar 600 located on one side of the exposure hole 200 , and the lead 700 coupled to the negative terminal of the secondary battery 500 may pass through the exposure hole 200 and be coupled to the bus bar 600 located on the other side of the exposure hole 200 .

[0087] The bonding of the lead 700 can be performed by an operator while directly observing the exposure hole 200, or by a wire bonding device. One end of the lead 700 can be bonded at a position spaced a predetermined distance from the inner surface of the exposure hole 200 in the direction inward relative to the surface extending toward the secondary battery 500.

[0088] Reference Figure 7In (a) and (b), when the wire bonding apparatus bonds one end of the lead 700 to the electrode terminal of the secondary battery 500, the bonding position is determined by the image or video generated by the visual inspection apparatus, and the position where the lead 700 is to be bonded can be determined as a previously input position within the electrode terminal region of the secondary battery 500 exposed by the exposure hole 200. More specifically, the wire bonding apparatus inputs the position where the lead 700 is to be bonded as a position spaced 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 visual inspection apparatus, the wire bonding apparatus may not accurately calculate the position where the lead 700 is to be bonded, which may lead to errors in the bonding process of the lead 700. Furthermore, in cylindrical secondary batteries 500, both the positive terminal of the cap assembly and the negative terminal of the battery can may face the exposure hole 200. Therefore, when the lead 700 is bonded to the electrode terminal, it should be accurately bonded to a specific position of the target electrode terminal to avoid shorting the negative and positive electrodes.

[0089] The visual inspection device can be configured to photograph one surface of the secondary battery module 11 from directly above the one surface in which the exposure hole 200 is formed in the secondary battery module 11. Since the visual inspection device photographs the exposure hole 200 from above the exposure hole 200, in the image or video of the exposure hole 200 generated by the visual inspection device, the inner surface of the exposure hole 200 can form the boundary of the exposure hole 200. Therefore, a matte portion 210 that diffusely reflects incident light along the perimeter of the inner surface of the exposure hole 200 can be formed, making the boundary of the exposure hole 200 clearly visible in the image or video.

[0090] Matte portion 210 can diffusely reflect incident light and appear darker than the outer area of ​​exposure hole 200 in an image or video generated by the visual inspection device, thereby forming a clear boundary of exposure hole 200. In addition, in the image or video generated by the visual inspection device, matte portion 210 does not interfere with light reflected from the electrode terminal area of ​​secondary battery 500 located in the inner area of ​​exposure hole 200, so that the appearance of the electrode terminal of secondary battery 500 can be clearly displayed in the image or video without distortion. As a result, the wire bonding device can calculate the position where one end of lead 700 is bonded to the electrode terminal of secondary battery 500 and can accurately bond lead 700 to that position.

[0091] Implementation 3

[0092] As Embodiment 3 of the present disclosure, the visual system may include secondary battery modules 10 and 11 and a visual device (not shown). Details regarding the secondary battery modules 10 and 11 may be replaced by those of Embodiments 1 and 2 described above.

[0093] A visual device (not shown) may be configured to capture a surface of the secondary battery modules 10, 11 and output a visual image. The image captured and displayed by the visual device may include multiple exposure holes, the arrangement of the secondary batteries visible through the multiple exposure holes, the areas of the electrode leads, etc. The lead bonding device may identify the boundary surfaces of the exposure holes, the area of ​​the positive electrode lead, and the area of ​​the negative electrode based on the image captured by the visual device, and may bond the lead to the area of ​​the electrode lead that was pre-calculated based on the identified boundary surfaces of the exposure holes.

[0094] Figure 7 (a) shows an actual image of the exposure hole taken by the vision device when the inner surface of the exposure hole is glossy, and Figure 7 (b) shows an actual image of the exposure hole taken by the visual device when a matte portion is formed on the inner surface of the exposure hole. Figure 7 In (a), the boundaries of the exposed holes overlap in the image, so the boundaries appear unclear, but in Figure 7 In (b), it can be seen that since light is diffusely reflected by the matte portion 210 formed along the periphery of the inner surface of the exposure hole 200, the boundary of the exposure hole 200 becomes clear.

[0095] The present disclosure has been described above with respect to a limited number of embodiments and drawings, but the present disclosure is not limited thereto and may be implemented in various forms by a person skilled in the art to which the present disclosure relates within the technical aspects of the present disclosure and the scope of the appended claims and their equivalents.

[0096] [Reference Signs List]

[0097] 10: Secondary battery module frame

[0098] 11: Secondary battery module

[0099] 100: Main body

[0100] 200: Exposed hole

[0101] 210: Matte part

[0102] 211: First uneven surface

[0103] 300: Busbar slot

[0104] 400: First mold

[0105] 410: protrusion

[0106] 411: Second uneven surface

[0107] 420: Second mold

[0108] 500: Secondary battery

[0109] 600: Busbar

[0110] 700: Lead

[0111] a: first direction

[0112] b: Second direction

Claims

1. A secondary battery module frame, comprising: a main body, wherein a receiving space is formed in the main body; as well as a plurality of exposing holes passing through one surface of the body and arranged to expose the accommodation space, Wherein, in the exposure hole, A matte portion is formed along a periphery of an inner surface of the exposure hole and diffusely reflects light incident on the inner surface of the exposure hole.

2. The secondary battery module frame according to claim 1, in, In the matte portion, A first uneven surface having an irregular pattern is formed.

3. The secondary battery module frame according to claim 2, in, The first uneven surface has an average surface roughness of 0.35 μm to 3.00 μm.

4. The secondary battery module frame according to claim 2, in, The matte portion has lower brightness than a surface adjacent to the exposure hole.

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

6. The secondary battery module frame according to claim 5, in, A bus bar groove recessed to a predetermined depth along the first direction is formed between the exposed hole line and the adjacent exposed hole line.

7. The secondary battery module frame according to claim 2, in, The exposure hole is injection molded by a mold having a protrusion formed on one surface thereof for forming the exposure hole, and In the protrusion, A second uneven surface is formed along the periphery of the outer surface.

8. The secondary battery module frame according to claim 7, in, 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, in, 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, in, The second uneven surface is formed by chemically etching the surface of the protrusion.

11. The secondary battery module frame according to claim 9, in, The second uneven surface is formed by performing electrical discharge machining on the surface of the protrusion.

12. A secondary battery module, comprising: a plurality of secondary batteries; a main body that accommodates the plurality of secondary batteries in an internal accommodation space; as well as a plurality of exposure holes that pass through one surface of the body and expose electrode terminals of the secondary battery, Wherein, in the exposure hole, A matte portion is formed along a periphery of an inner surface of the exposure hole and diffusely reflects light incident on the inner surface of the exposure hole.

13. The secondary battery module according to claim 12, further comprising: a lead, one end of which is joined to the electrode terminal of the secondary battery, The lead wire is bonded to a position spaced apart from the inner surface of the exposure hole in an inward direction by a predetermined distance.

14. The secondary battery module according to claim 13, further comprising: A bus bar is located on the one surface of the body and is disposed adjacent to the exposure hole.

15. The secondary battery module according to claim 14, in, The lead wire passes through the exposure hole, and the other end of the lead wire is joined to the bus bar.

16. A visual system, comprising: Secondary battery module; as well as a visual device that captures one surface of the secondary battery module and outputs a visual image, Wherein, the secondary battery module includes: a main body having a receiving space formed therein; and a plurality of exposing holes passing through one surface of the body and arranged to expose the accommodation space, Wherein, in the exposure hole, A matte portion is formed along a periphery of an inner surface of the exposure hole and diffusely reflects light incident on the inner surface of the exposure hole.

Images