Intermodule busbar

Abstract

The present invention relates to an intermodule busbar, and more specifically, the present invention provides a secondary battery comprising a conduction unit for electrically connecting a plurality of objects, a first insulating layer surrounding the conduction unit, and a second insulating layer surrounding the first insulating layer, wherein the first insulating layer has an exhaust line that communicates with the outside and is provided for discharging gas.

Description

Technical Field

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0036953 filed on March 21, 2023, and all the contents disclosed in the literature of the Korean patent application are incorporated herein by reference in their entirety.

[0002] The present invention relates to an inter-module bus bar, and more specifically, to an inter-module bus bar capable of discharging liquid and gas generated from the bus bar.

Background Art

[0003] Currently commercialized secondary batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries, lithium secondary batteries, etc. Among them, lithium secondary batteries have almost no memory effect compared to nickel-based secondary batteries, so they can be charged and discharged freely, have a very low self-discharge rate, and have the advantage of high energy density, and are in the spotlight. <000​​​​​​​​​​On the other hand, among the busbars mentioned above, those used for connecting battery modules are called intermodule busbars. Two adjacent battery modules may be electrically connected via an intermodule busbar. In other words, the electrode terminals of one battery module and the electrode terminals of another battery module may be energized via an intermodule busbar. Multiple battery modules can be connected in series in such a pattern to constitute a high-power battery pack.

[0007] However, with intermodule busbars, the continuous flow of current through the busbar generates high temperatures, which can alter the physical or chemical properties of the insulator surrounding the busbar, causing gases and liquids to be released. These released gases and liquids form a certain pressure inside the insulator, and if the pressure exceeds a certain level, the insulator is damaged, exposing the metal parts of the busbar to the outside. [Overview of the project] [Problems that the invention aims to solve]

[0008] The present invention aims to solve the above problems and provides an intermodule busbar that can prevent damage to the insulator by rapidly discharging liquids and gases generated from the insulator surrounding the busbar to the outside. [Means for solving the problem]

[0009] According to a first embodiment of the present invention, the present invention provides an intermodule busbar comprising a conduction unit for electrically connecting a plurality of objects, a first insulating layer surrounding the conduction unit, and a second insulating layer surrounding the first insulating layer, wherein the first insulating layer has an exhaust line that communicates with the outside and is provided for discharging gas.

[0010] Furthermore, a coating layer may be further included between the first insulating layer and the conductive unit, which coats the surface of the conductive unit with powder.

[0011] Furthermore, the surface roughness of the coating layer may be even rougher than the surface roughness of the conductive unit.

[0012] Furthermore, the surface roughness of the coating layer may be even smoother than the surface roughness of the conductive unit.

[0013] Furthermore, the first insulating layer may be in close contact with the coating layer.

[0014] Furthermore, the first insulating layer may also contain a silicon material.

[0015] Furthermore, the discharge line may include a first discharge hole formed on the outer surface of the first insulating layer and exposed to the outside, and a communication line having one end communicating with the first discharge hole, formed in the longitudinal direction of the first insulating layer, and provided to create an empty space inside the first insulating layer.

[0016] Furthermore, the first discharge hole may be formed at one end of the first insulating layer and provided at a predetermined distance from the second insulating layer.

[0017] Furthermore, the discharge line further includes a second discharge hole formed at the other end of the communication line, and the second discharge hole may be formed at the other end of the first insulating layer.

[0018] Furthermore, a plurality of discharge lines may be provided, and the plurality of discharge lines may be arranged parallel to each other in the longitudinal direction of the first insulating layer and spaced apart from each other in a predetermined arrangement.

[0019] Furthermore, the discharge line may be positioned even more skewed in the direction in which the second insulating layer is located.

[0020] Furthermore, the conduction unit may connect between a plurality of secondary battery modules.

[0021] Furthermore, the conduction unit may include a connection part and coupling parts formed at both end parts of the connection part and coupled to the secondary battery module.

[0022] Furthermore, the second insulating layer may be a mica tape containing a mica material.

[0023] According to the second embodiment of the present invention, the present invention includes a plurality of secondary battery modules and an inter-module bus bar that electrically connects between the secondary battery modules. The inter-module bus bar includes a conduction unit that electrically connects between the plurality of secondary battery modules, a first insulating layer that surrounds the conduction unit, and a second insulating layer that surrounds the first insulating layer. A discharge line that communicates with the outside and is provided to discharge gas is formed in the first insulating layer, and a secondary battery module assembly is provided.

Advantages of the Invention

[0024] The present invention can discharge liquid and gas generated from the insulator surrounding the bus bar to the outside to prevent damage to the insulator and prevent the metal part of the bus bar from being exposed to the outside, so an inter-module bus bar with improved safety can be provided.

Brief Description of the Drawings

[0025] [Figure 1] It is a perspective view showing the state of the inter-module bus bar in the first embodiment of the present invention. [Figure 2] It is a perspective view showing the state of the conduction unit in the first embodiment of the present invention. [Figure 3] It is a perspective view showing the state where a coating layer is coated on the conduction unit in the first embodiment of the present invention. [Figure 4a]It is a cross-sectional view showing a plane obtained by cutting the conduction unit of FIG. 3 in the first embodiment of the present invention along the virtual line CC'. [Figure 4b] It is a cross-sectional view showing a plane obtained by cutting the conduction unit of FIG. 3 in the first embodiment of the present invention along the virtual line CC'. [Figure 5] It is a cross-sectional view showing a plane obtained by cutting the inter-module bus bar of FIG. 1 in the first embodiment of the present invention along the virtual line AA'. [Figure 6a] It is a plan view showing an exhaust line in an embodiment of the exhaust line of the present invention, which is formed inside a first insulating layer surrounding a conduction unit. [Figure 6b] It is a plan view showing an exhaust line in an embodiment of the exhaust line of the present invention, which is formed inside a first insulating layer surrounding a conduction unit. [Figure 7] It is a front view showing an enlarged view of the "B" part in FIG. 1.

Mode for Carrying Out the Invention

[0026] Hereinafter, the present invention will be described more specifically with reference to the drawings. However, the attached drawings are for facilitating the understanding of the present invention and are merely one embodiment of the present invention, and the scope of the present invention is not limited to the scope described in the drawings. Also, in the attached drawings, the same reference numerals indicate the same components, and for the sake of smooth understanding of the invention, some components may be shown exaggerated, reduced, or omitted.

[0027] Furthermore, the terms and words used in this specification and the claims should not be construed as being limited to their ordinary or dictionary meanings, and should be construed in accordance with the principle that the inventor can appropriately define the concept of the terms in order to explain his invention in the best way, so as to conform to the meaning and concept consistent with the technical idea of the present invention.

[0028] First Embodiment Referring to Figure 1, in a first embodiment of the present invention, the intermodule busbar 10 of the present invention may include a conduction unit 100, a coating layer 200, a first insulating layer 300, and a second insulating layer 400.

[0029] The intermodule busbar 10 can be placed between multiple objects that require electrical connection to electrically connect multiple objects. Examples of applications include, but are not limited to, electrically connecting one secondary battery module to another, electrically connecting a secondary battery module to a relay box, electrically connecting a secondary battery module to other electrical components, and electrically connecting other electrical components to each other.

[0030] The conduction unit 100 may include electrically conductive metal materials such as copper, aluminum, silver, or gold to enable electrical connection between multiple objects.

[0031] Referring to Figure 2, the conduction unit 100 may be formed from a metal piece, metal plate, metal rod, etc., formed to a predetermined thickness and length, and may also include a connecting portion 110 and a joint portion 120.

[0032] The connection portion 110 is located in the central region in the longitudinal direction of the conduction unit 100 and may be located between the coupling portions 120. The connection portion 110 connects multiple coupling portions 120 and can electrically connect objects such as secondary battery modules (not shown) that are coupled to the coupling portions 120.

[0033] The connection portion 110 includes straight shapes, curved shapes, curved shapes, etc., depending on the position and shape of the multiple objects connected by the transmission unit 100.

[0034] The coupling portion 120 may be located at both longitudinal ends of the connection portion 110 of the conduction unit 100. Multiple coupling portions 120 may be coupled to the electrode terminals of objects to which the conduction unit 100 is electrically connected, and objects coupled to multiple coupling portions 120 may be electrically connected in series or parallel via the connection portion 110.

[0035] The coupling portion 120 may include a through-hole that penetrates the widest surface of the conduction unit 100. Screws, rivets, bolts, nuts, etc., may be fastened to the through-hole of the coupling portion 120 together with an object such as a secondary battery module (not shown), and the fastened objects may be electrically connected to each other.

[0036] Referring to Figure 3, the coating layers 200 and 201 coat the surface of the conductive unit 100 between the first insulating layer 300 and the conductive unit 100, and can guide the first insulating layer 300 to adhere closely to the conductive unit 100.

[0037] The coating layers 200 and 201 refer to methods of coating the surface of the conduction unit 100, including, but are not limited to, plating (coating the surface of the conduction unit 100 with a metal different from that of the conduction unit 100), case hardening (hardening the surface of the conduction unit 100 by impregnating it with carbon or nitrogen through heat treatment), chemical coatings (forming a chemical film on the surface of the conduction unit 100 by chemical treatment such as phosphate coating or chromate coating), anodizing (artificially increasing the thickness of the oxide layer on the metal surface), lining liquid coating (covering the conduction unit 100 with rubber or synthetic resin), and painting (coating with a liquid or powdered substance). Preferably, the coating layers 200 and 201 are coatings of the conduction unit 100 with a powdered substance.

[0038] Referring to Figure 4a, in one embodiment of the coating layer, the coating layer 200 coats the smooth surface of the metal conductive unit 100 with particles of a predetermined size. Therefore, the surface roughness of the coating layer 200 may be rougher than the surface roughness of the conductive unit 100. Since the coating layer 200 is formed on the surface of the conductive unit 100 between the first insulating layer 300 and the conductive unit 100, the inner surface of the first insulating layer 300 is in contact with the surface of the coating layer 200, and the first insulating layer 300 can adhere more closely to the conductive unit 100 due to the surface of the coating layer 200, which is rougher than the surface roughness of the conductive unit 100.

[0039] The coating layer 200 may be formed by friction of powdery particles of a predetermined size against a material such as Teflon (registered trademark) at high speed, or by charging them with a positive or negative charge using an electromagnetic field generated by a high-voltage generator, and then spraying them to coat the surface of the conductive unit 100. The coating layer 200 may, but is not limited thereto, contain one or more plastic powder materials such as epoxy, polyester, polyethylene, polyvinyl chloride, nylon, polyurethane, and acrylic.

[0040] Referring to Figure 4b, in another embodiment of the coating layer, the coating layer 201 contains fine-sized particles, which can further smooth the surface of the conduction unit 100. If the surface of the conduction unit 100 is not smooth and has irregularities due to the manufacturing process of the conduction unit 100, the fine-sized particles of the coating layer 200 can fill the gaps in the irregular surface of the conduction unit 100, resulting in a smooth coating that makes the surface of the conduction unit 100 smooth and flat.

[0041] When the conductive unit 100 is coated with the coating layer 201, the coating layer 201 and the first insulating layer can adhere closely together. Even when the first insulating layer 300 surrounding the coating layer 201 gradually ceramicizes and hardens due to continuous and repeated use, the coating layer 201, which has a smooth surface, can adhere closely to the first insulating layer.

[0042] The coating layer 201 may be formed by friction of powdery particles of a predetermined size against a material such as Teflon (registered trademark) at high speed, or by charging them with a positive or negative charge using an electromagnetic field generated by a high-voltage generator, and then spraying them to coat the surface of the conductive unit 100. The coating layer 201 may, but is not limited thereto, contain one or more plastic powder materials such as epoxy, polyester, polyethylene, polyvinyl chloride, nylon, polyurethane, and acrylic.

[0043] Referring to Figure 5, the first insulating layer 300 may be provided so as to surround the conductive unit 100. More specifically, the first insulating layer 300 may be provided so as to surround the conductive unit 100 coated with coating layers 200 and 201. By surrounding the conductive unit 100, the first insulating layer 300 prevents the exposure of areas of the conductive unit 100 that could be exposed to the outside, thereby preventing electrical short circuits that may occur when the conductive unit 100 comes into contact with surrounding objects.

[0044] The first insulating layer 300 may be provided so as to surround not only the connection portion 110 coated by the coating layers 200 and 201, but also the surrounding connection portion 120 area.

[0045] The first insulating layer 300 may contain at least one material having electrical insulating properties, such as polyvinyl chloride, polypropylene, polyethylene, polyurethane, synthetic rubber, ceramic, silicone, silicone rubber, or synthetic resin. Preferably, the first insulating layer 300 contains a material such as silicone or silicone rubber.

[0046] The first insulating layer 300 has an inner surface surrounding the conductive unit 100 that is in contact with the coating layers 200 and 201, and can adhere closely to the rough or smooth surface of the coating layers 200 and 201.

[0047] The first insulating layer 300 may include a flexible material that is flexible and capable of elastic deformation. Therefore, the surface shape of the inner surface of the first insulating layer 300 that contacts the surfaces of the coating layers 200, 201 is elastically deformed according to the surface shape of the coating layer 200, and the inner surface of the first insulating layer 300 can adhere strongly to the surface of the coating layer 200. As a result, the first insulating layer 300 can be positioned to be in close contact with the conductive unit 100.

[0048] The first insulating layer 300 can deform in response to morphological deformation, such as bending, of the intermodule busbar 10 according to the present invention. Even if the first insulating layer 300 is bent or folded, the adhesion between the first insulating layer 300 attached to the coating layers 200 and 201 and the coating layers 200 and 201 is maintained, and therefore the adhesion between the first insulating layer and the conductive unit 100 is also maintained.

[0049] The conductive unit 100 is coupled to the electrode terminals of each object so that it can electrically connect multiple objects, and high heat may be generated in the conductive unit 100 as current continues to flow through it. The heat generated from the conductive unit 100 directly or indirectly affects the coating layers 200, 201 and the first insulating layer 300, and physical or chemical deformation may occur in the coating layers 200, 201 and the first insulating layer 300. The coating layers 200, 201 and the first insulating layer 300 may generate liquid or gas as a result of the physical or chemical deformation, and if the generated liquid or gas accumulates without being immediately discharged to the outside, the pressure may damage the first insulating layer 300 and the second insulating layer 400, so a means of rapidly discharging it may be necessary. Therefore, the first insulating layer 300 may have discharge lines 310, 320 that communicate with the outside and are provided to discharge gas and liquid.

[0050] The first insulating layer 300 is physically or chemically deformed by continuous and repeated exposure to heat, gradually becoming ceramic and hardening. When the first insulating layer 300 hardens, fine gaps are formed inside it, and these fine gaps are connected to the discharge lines 310 and 320. When the fine gaps formed inside the first insulating layer 300 are connected to the discharge lines 310 and 320, any liquid or gas generated in the coating layers 200 and 201 and the first insulating layer 300 flows into the discharge lines 310 and 320 through these gaps and is thereby discharged to the outside.

[0051] The discharge lines 310 and 320 are formed within the first insulating layer 300 and may be formed in the longitudinal direction of the first insulating layer 300. The first insulating layer 300 preferably contains a material such as silicone or silicone rubber so that gases such as water vapor and gases can permeate through it, and gases generated from the first insulating layer 300 and the coating layers 200 and 201 can permeate through the first insulating layer 300 and reach the discharge lines 310 and 320.

[0052] Referring to Figure 6a, in one embodiment of the discharge lines 310 and 320, the discharge line 310 may include a first discharge hole 311, a communication line 312, and a second discharge hole 313.

[0053] The first discharge hole 311 may be formed on the outer surface of the first insulating layer 300 and exposed to the outside so that the liquid and gas discharged through the communication line 312 can be discharged to the outside.

[0054] The first discharge hole 311 may be formed at one end of the first insulating layer 300 and provided at a predetermined distance from the second insulating layer 400. Since the second insulating layer 400 surrounding the first insulating layer 300 is positioned at a distance from the first discharge hole 311, the first discharge hole 311 is not closed by the second insulating layer 400, and liquids and gases can be discharged to the outside.

[0055] The communication line 312 is a space through which liquids and gases generated in the first insulating layer 300 and the coating layer 200 are discharged, and may be formed such that one end communicates with the first discharge hole 311 and the other end communicates with the second discharge hole 313 and penetrates the first insulating layer 300.

[0056] The communication line 312 may be formed inside the first insulating layer 300 in the longitudinal direction of the first insulating layer 300.

[0057] The communication line 312 may be provided to form an empty space inside the first insulating layer 300 so that the liquid and gas generated in the first insulating layer 300 and the coating layers 200, 201 move toward the first discharge hole 311 or the second discharge hole 313.

[0058] The communication line 312 may include an inclined surface on its inner bottom that is formed downward toward the first discharge hole 311 and the second discharge hole 313, so that the liquid generated in the first insulating layer 300 and the coating layers 200, 201 can flow toward the first discharge hole 311 and the second discharge hole 313.

[0059] The communication line 312 increases the surface area of ​​the first insulating layer 300, allowing the heat transferred from the conduction unit 100 to be rapidly cooled by the liquid and gas moving through the communication line 312.

[0060] The communication line 312 forms an empty space within the first insulating layer 300 in the longitudinal direction of the first insulating layer 300, thus providing a space that can buffer not only the movement of liquids and gases, but also the shocks that may occur when the first insulating layer 300 undergoes physical or chemical deformation due to the high temperature heat generated from the conduction unit 100.

[0061] The communication line 312 may be formed in a straight line along the longitudinal direction of the first insulating layer 300, from one end to the other, to allow liquids and gases that have flowed into the communication line 312 to be quickly discharged to the outside.

[0062] Referring to Figure 7, the second discharge hole 313 may be formed on the outer surface of the first insulating layer 300 and exposed to the outside so that the liquid and gas discharged through the communication line 312 can be discharged to the outside.

[0063] The second discharge hole 313 may be formed at the other end of the first insulating layer 300 and provided at a predetermined distance from the second insulating layer 400. Since the second insulating layer 400 surrounding the first insulating layer 300 is positioned at a distance from the second discharge hole 313, the second discharge hole 313 is not closed by the second insulating layer 400, and liquids and gases can be discharged to the outside.

[0064] The communication line 312 may have a first discharge hole 311 at one end and a second discharge hole 313 at the other end, and the discharge line 310 may penetrate the first insulating layer 300 in the longitudinal direction. Therefore, the liquid and gas generated in the coating layers 200, 201 and the first insulating layer 300 and discharged into the communication line 312 move along the communication line 312 and are then discharged to the outside in both directions from the first discharge hole 311 and the second discharge hole 313.

[0065] Referring to Figure 6b, in another embodiment of the discharge line 320, the discharge line 320 may include a first discharge hole 321 and a communication line 322.

[0066] The first discharge hole 321 may be formed on the outer surface of the first insulating layer 300 and exposed to the outside so that the liquid and gas discharged through the communication line 322 can be discharged to the outside.

[0067] The first discharge holes 321 may be formed at one end and the other end of the first insulating layer 300 and may be provided at a predetermined distance from the second insulating layer 400. Since the second insulating layer 400 surrounding the first insulating layer 300 is positioned at a distance from the first discharge holes 321, the first discharge holes 321 are not closed by the second insulating layer 400, and liquids and gases can be discharged to the outside.

[0068] The communication line 322 may be a space for the liquid and gas generated in the first insulating layer 300 and the coating layer 200 to be discharged and move in the direction in which the first discharge hole 321 is formed, or it may be an empty space extending from the first discharge hole 321 formed at one end and the other end of the first insulating layer 300 toward the longitudinal center of the first insulating layer 300.

[0069] The communication line 322 may be formed with a structure in which a first discharge hole 321 is located at one end and the other end is closed. Liquids and gases discharged into the communication line 322 move along the communication line 322 and are discharged from the first discharge hole 321.

[0070] The communication line 322 may include an inclined surface whose inner bottom surface is formed downward toward the first discharge hole 321, so that the liquid generated in the first insulating layer 300 and the coating layers 200, 201 can flow toward the first discharge hole 321.

[0071] The communication line 322 may be formed inside the body of the first insulating layer 300 in the longitudinal direction of the first insulating layer 300.

[0072] The communication line 322 increases the surface area of ​​the first insulating layer 300, allowing the heat transferred from the conductive unit 100 to be rapidly cooled by the liquid and gas that moves through the communication line 322.

[0073] The communication line 322 forms an empty space within the first insulating layer 300 in the longitudinal direction of the first insulating layer 300, thus providing a space that can buffer not only the movement of liquids and gases, but also the shocks that may occur when the first insulating layer 300 undergoes physical or chemical deformation due to the high temperature heat generated from the conduction unit 100.

[0074] Multiple discharge lines 320 may be provided in the first insulating layer 300.

[0075] The multiple discharge lines 320 may be arranged parallel to each other in the longitudinal direction of the first insulating layer 300, and may be arranged spaced apart from each other in a predetermined arrangement along the periphery in the inner region of the periphery of the first insulating layer 300.

[0076] The discharge line 320 is positioned between the coating layers 200, 201 and the second insulating layer 400, and may be positioned further offset from the direction in which the coating layer 200 is positioned towards the direction in which the second insulating layer 400 is positioned, or further offset from the direction in which the second insulating layer 400 is positioned towards the direction in which the coating layers 200, 201 are positioned, or may be positioned along the central region between the second insulating layer 400 and the coating layers 200, 201.

[0077] By positioning the discharge line 320 further offset from the direction in which the coating layers 200 and 201 are located, gases and liquids generated from the first insulating layer 300 and the coating layers 200 and 201 can be discharged through the discharge line 320, preventing damage to the second insulating layer 400 due to the pressure of the gases and liquids.

[0078] The second insulating layer 400 may be provided so as to surround the first insulating layer 300. The second insulating layer 400 may be provided so as to completely surround the periphery of the first insulating layer 300 or to surround only a part of the periphery. Furthermore, the second insulating layer 400 can surround the first insulating layer 300 in a way that compresses it, thereby improving the adhesion between the first insulating layer 300 and the coating layers 200, 201.

[0079] The second insulating layer 400 may include a material that has electrical insulating and fire-resistant properties.

[0080] The second insulating layer 400 may specifically include a substrate (not shown) and a mica layer (not shown) formed on one or both sides of the substrate. The second insulating layer may be, for example, a laminated mica tape manufactured by crushing mica ore and forming it in the same way as papermaking, then coating it onto the substrate using an epoxy adhesive or a silicone adhesive, and then drying it.

[0081] The substrate is not limited as long as it has bearing capacity, and may be selected from, for example, fibrous substrates or polymer films. As the fibrous substrate, glass fibers can be used, and such glass fibers are preferably in the form of tapes such as S-glass or E-glass, but tapes of lower grade such as glass cloth tape or woven glass fabric can also be used. As for the polymer film material, for example, polymer films such as polyethylene, polyimide, and aromatic polyamide films can be used.

[0082] The mica layer may contain mica material. The mica may be one or more selected from, for example, phlogopite (KMg3AlSi3O10(OH,F)2), a type of mica, muscovite (KAl2(AlSi)4O10(OH,H)2), etc.

[0083] The mica preferably contains a soft mica material with phlogopite as the main raw material. Although soft mica is inferior to hard mica with muscovite as the main raw material in terms of its performance as an electrical insulator, it has the advantage of maintaining its molecular structure even at 900°C due to its high heat resistance, and may be included in the second insulating layer 400 as a material for electrical insulation and fire resistance.

[0084] Second Embodiment In a second embodiment of the present invention, the secondary battery module assembly (not shown) of the present invention may include a plurality of secondary battery modules (not shown) and an intermodule busbar 10 that electrically connects the secondary battery modules. The intermodule busbar 10 may include a conduction unit 100 containing an electrically conductive material, coating layers 200, 201 that coat the surface of the conduction unit 100, a first insulating layer 300 surrounding the coating layers 200, 201, and a second insulating layer 400 surrounding the first insulating layer 300. The first insulating layer 300 may have discharge lines 310, 320 that communicate with the outside and are provided to discharge gas. A detailed description of the intermodule busbar 10 can be found by referring to the description in the first embodiment.

[0085] Although the present technology has been described above with reference to embodiments, the present technology is not limited thereto. The above embodiments can be modified or altered within the spirit and scope of the present technology, and any person with ordinary skill in the art to which the present invention belongs will understand that such modifications and alterations also belong to the present technology. [Explanation of symbols]

[0086] 10 Intermodule Busbars 100 conduction units 110 Connection part 120 Joint 200, 201 coating layer 300 First insulating layer 310, 320 discharge lines 311, 321 1st discharge hole 312, 322 connecting lines 313 2nd discharge hole 400 Second insulating layer

Claims

1. A conduction unit that electrically connects multiple objects, A first insulating layer surrounding the aforementioned conductive unit, Including a second insulating layer surrounding the first insulating layer, The first insulating layer includes: An intermodular busbar is provided with an exhaust line that connects to the outside and is designed to discharge gas.

2. The intermodule busbar according to claim 1, further comprising a coating layer between the first insulating layer and the conductive unit, which coats the surface of the conductive unit with powder.

3. The aforementioned coating layer is The intermodule busbar according to claim 2, wherein the surface roughness is even rougher than the surface roughness of the transmission unit.

4. The aforementioned coating layer is The intermodule busbar according to claim 2, wherein the surface roughness is even smoother than the surface roughness of the transmission unit.

5. The first insulating layer is An intermodule bus bar according to claim 3 or 4, which adheres closely to the coating layer.

6. The first insulating layer is An intermodule bus bar according to claim 5, comprising a silicone material.

7. The aforementioned discharge line is A first discharge hole formed on the outer surface of the first insulating layer and exposed to the outside, The intermodule bus bar according to claim 1, comprising a communication line having one end in communication with the first discharge hole, formed in the longitudinal direction of the first insulating layer, and provided to form an empty space inside the first insulating layer.

8. The first discharge port is The intermodule bus bar according to claim 7, which is formed at one end of the first insulating layer and provided at a predetermined distance from the second insulating layer.

9. The aforementioned discharge line is The communication line further includes a second discharge hole formed at the other end of the communication line, The second discharge port is The intermodule bus bar according to claim 8, formed at the other end of the first insulating layer.

10. The aforementioned discharge line is Multiple facilities are provided, Multiple of the aforementioned discharge lines are The first insulating layer is arranged parallel to each other in the longitudinal direction, The intermodule busbars according to claim 1, which are arranged spaced apart from each other in a predetermined arrangement.

11. The aforementioned discharge line is The intermodule busbar according to claim 10, wherein the second insulating layer is further offset from the direction in which it is arranged.

12. The aforementioned conduction unit is An intermodule busbar according to claim 1, for connecting multiple secondary battery modules.

13. The aforementioned conduction unit is The connecting part, The intermodule bus bar according to claim 12, further comprising coupling portions formed at both ends of the connection portion and coupled to the secondary battery module.

14. The intermodule bus bar according to claim 1, wherein the second insulating layer is a mica tape containing mica material.

15. Multiple secondary battery modules, It includes an intermodule busbar that electrically connects the secondary battery modules, The aforementioned intermodule busbar is A conduction unit that electrically connects multiple secondary battery modules, A first insulating layer surrounding the aforementioned conductive unit, Including a second insulating layer surrounding the first insulating layer, The first insulating layer includes: A secondary battery module assembly having an exhaust line that communicates with the outside and is designed to discharge gas.

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