Refractory bus bar and battery pack comprising same

Abstract

The invention provides a refractory bus bar and a battery pack including the same. The refractory bus bar includes: a bus bar conductor portion; a refractory silicone cover including a cap portion covering both ends of the bus bar conductor portion, and a main body covering portion integrally joined to the cap portion while covering a main body of the bus bar conductor portion between the both ends, the refractory silicone cover is ceramized at a high temperature to support the bus bar conductor portion; and a protective layer covering the refractory silicone covering, in which a through hole extending from an upper surface of the cap portion to a surface where the cap portion is in contact with the bus bar conductor portion is formed in the cap portion.

Description

Technical Field

[0001] The present invention relates to a fire-resistant bus bar and a battery pack comprising the bus bar.

[0002] More specifically, the present invention relates to a cap-integrated fire-resistant busbar and a battery pack comprising the busbar, wherein the cap-integrated fire-resistant busbar comprises a fire-resistant silicone covering and a protective layer covering the fire-resistant silicone covering, the fire-resistant silicone covering comprises a cap portion and a main body covering portion integrally joined to the cap portion, and is ceramicized at high temperatures, thereby maintaining insulation and airtightness properties even at high temperatures when a fire occurs in the battery pack.

[0003] This application claims priority to Korean Patent Application No. 10-2023-0037684, filed on Mar. 23, 2023, which is hereby incorporated by reference in its entirety. Background Art

[0004] A battery pack for electric vehicles, etc. has a structure in which a plurality of battery modules including a plurality of secondary batteries are connected in series or in parallel to obtain high power. Each secondary battery includes a positive electrode current collector and a negative electrode current collector, a separator, an active material, an electrolyte, etc., and can be repeatedly charged and discharged by an electrochemical reaction between these components.

[0005] The busbar is used to electrically connect the battery modules. The busbar is used to electrically connect the terminal portions of adjacent battery modules or to connect the battery modules to an external electrical device.

[0006] Figure 1 Schematic diagram showing an assembly structure of a bus bar and a cap in the prior art.

[0007] like Figure 1 As shown, the bus bar 10 of the prior art includes a bus bar conductor portion 11 and a cover layer 12 surrounding the bus bar conductor portion 11. The bus bar conductor portion 11 is, for example, a high-purity copper conductor portion (e.g., C1100) or a conductor portion formed of a metal such as aluminum. The cover layer 12 is formed of a general silicone rubber or epoxy resin. In the prior art, a cap 20 is attached to the cover layer 12 of the bus bar 10 using a wear-resistant tape 30 or the like. The cap 20 is formed separately so that the cap 20 can be freely opened or closed when the bus bar 10 is joined to another electrical connection portion by fastening fasteners to the fastening holes 11a at both ends of the bus bar 10.

[0008] However, the cap 20 is a soft rubber cap, so the insulation is low and it is easily impacted. In addition, the operation of connecting the bus bar 10 and the cap 20 using the tape is cumbersome and reduces productivity. In addition, the wear-resistant tape 30 has low fire resistance, so when the wear-resistant tape 30 melts at high temperature, the bus bar 10 and the cap 20 may be separated from each other instead of being fixed to each other.

[0009] In particular, when in a battery pack, the internal components of the battery pack are electrically connected using the bus bar 10 of the related art, and when a flame occurs in the battery pack, since the flame temperature is very high (500 to 800°C, or above 800°C, above 1000°C in severe cases), not only the rubber cap is melted, but also the cover layer 12 formed of silicone rubber or epoxy resin is melted, and the bus bar conductor portion 11 is exposed. In this case, the exposed bus bar conductor portion is electrically contacted with other metal components in the battery pack, causing an electrical short circuit to occur, and the flame also spreads due to the heat generated by the electrical short circuit.

[0010] In order to prevent the spread of heat, a bus bar including a cover layer formed of mica sheet, glass fiber, heat-resistant silicone (rubber), or the like can be considered.

[0011] However, in such a case where extremely high heat is generated, the above materials cannot be used to adequately prevent heat propagation. For example, the heat-resistant temperature of general heat-resistant silicone rubber is only 125 to 300°C, so it cannot effectively deal with the situation where a fire occurs in the battery pack. In addition, the covering layer formed of mica sheets or glass fibers does not show sufficient fire resistance.

[0012] As described above, recently, it is necessary to design the battery pack so as to prevent the flame from leaking to the outside of the battery pack when a fire occurs in the battery pack.

[0013] Furthermore, the battery pack needs to be designed so that the bus bar conductor portion can be thermally and electrically insulated from the surroundings even at a high temperature when a fire occurs in the battery pack.

[0014] As described above, it is necessary to develop a technology that improves the insulation level and assemblability while ensuring fire resistance at high temperatures to maintain electrical insulation.

[0015] [Prior art literature]

[0016] [Patent Document]

[0017] (Patent Document 1) Korean Patent Application Publication No. 2022-0001228 Summary of the invention

[0018] [Technical issues]

[0019] The present invention aims to provide a fire-resistant bus bar that maintains thermal insulation and electrical insulation as long as possible even when a fire occurs in a battery pack.

[0020] The present invention is also intended to provide a cap-integrated fire-resistant bus bar in which not only a main body covering portion of a bus bar conductor portion but also cap portions covering both ends of the bus bar conductor portion are integrally formed.

[0021] The present invention is also directed to a fire-resistant bus bar, wherein the cap portion includes a through hole through which a fastener can pass.

[0022] The present invention is also directed to a battery pack comprising a fire-resistant bus bar.

[0023] [Technical solution]

[0024] According to one aspect of the present invention, a refractory busbar comprises: a busbar conductor portion; a refractory silicone covering, the refractory silicone covering comprising a cap portion covering both ends of the busbar conductor portion, and a main body covering portion integrally joined to the cap portion while covering the main body of the busbar conductor portion between the two ends, the refractory silicone covering being ceramicized at a high temperature to support the busbar conductor portion; and a protective layer covering the refractory silicone covering, wherein a through hole is formed in the cap portion extending from the upper surface of the cap portion to the surface of the cap portion in contact with the busbar conductor portion.

[0025] Refractory silicones can be ceramized at temperatures between 500 and 1700°C.

[0026] The refractory silicone may be ceramicized by sintering a silicone resin containing the silicone compound represented by Chemical Formula 1 and a metal oxide containing silicon oxide.

[0027] [Chemical formula 1]

[0028]

[0029] In Chemical Formula 1, m and n may be integers of 10 to 30, respectively.

[0030] The weight ratio of the silicone resin to the metal oxide may be 1:0.5 to 1:1.5.

[0031] The metal oxide containing silicon oxide may include at least one of pure silicon dioxide, silica, quartz, silica, tridymite, and keatite.

[0032] The protective layer may be a glass fiber layer or a mica layer.

[0033] The through hole may have a diameter smaller than a diameter of a head of a fastener configured to be inserted into the through hole to be engaged to the bus bar conductor portion.

[0034] The through hole may include a first hole having a diameter smaller than a diameter of a head of a fastener configured to be engaged to the busbar conductor portion while passing through the through hole, and a second hole having a diameter larger than a diameter of the head of the fastener.

[0035] A cut slit connected to the through hole may be provided around the through hole of the cap portion.

[0036] The cap portion may include a first covering portion and a first extended covering portion, the first covering portion including the through hole inside and configured to cover the upper surfaces of the two ends, the first extended covering portion extending downward from the first covering portion to cover the side surfaces of the two ends; and the main body covering portion may include a second covering portion and a second extended covering portion, the second covering portion being configured to cover the upper surface of the main body, the second extended covering portion extending downward from the second covering portion to cover the side surfaces of the main body.

[0037] The fire-resistant bus bar may be a high-voltage bus bar for electrically connecting high-voltage terminal portions of a plurality of battery modules.

[0038] The bus bar conductor portion may be covered with the fire-resistant silicone cover by insert injection molding by injecting the fire-resistant silicone into a mold in which the bus bar conductor portion is inserted.

[0039] Another aspect of the present invention provides a battery pack including a plurality of battery modules, a fire-resistant bus bar configured to electrically connect the plurality of battery modules, and a battery pack case configured to accommodate the plurality of battery modules therein.

[0040] The battery pack housing may include a partition wall installed between the multiple battery modules, both ends of the bus bar conductor portion of the fire-resistant bus bar may be electrically connected to the terminal portions of the battery modules located on both sides of the partition wall, and the cap portion of the fire-resistant bus bar may cover the portions where the two ends and the terminal portions are connected to each other.

[0041] A busbar installation through hole or a busbar installation groove may be provided in the partition wall, and the fire-resistant busbar may be placed in the busbar installation through hole or the busbar installation groove.

[0042] [Beneficial Effects]

[0043] The fire-resistant bus bar of the present invention includes a fire-resistant silicone covering that ceramicizes to support the bus bar conductor portion when a flame occurs in a battery pack instead of a covering layer that burns in the flame, thereby maintaining insulation and airtight properties even at high temperatures.

[0044] In the fire-resistant busbar of the present invention, the body covering portion of the busbar conductor portion and the cap portion covering both ends of the busbar conductor portion are integrally formed, thereby simplifying the manufacture of the busbar and the cap and significantly improving the connection strength of the busbar and the cap.

[0045] The cap portion may be formed of fire-resistant silicone to further enhance the insulation and fire-resistant airtightness of the cap portion.

[0046] In addition, a through hole through which a fastener can pass may be formed in the cap portion to minimize damage to the fire-resistant bus bar when the fire-resistant bus bar is fastened to another bus bar and to facilitate fastening of the fire-resistant bus bar to another bus bar or an electrical connection portion.

[0047] The fire-resistant bus bar of the present invention may include a protective layer to cover the fire-resistant silicone cover, so that the protective layer may mainly function as a fire barrier while preventing the fire-resistant silicone cover from being directly exposed to flames, thereby maintaining the overall shape and size. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 Schematic diagram illustrating the assembly structure of a bus bar and a cap in the prior art.

[0049] Figure 2 It is a perspective view of a fire-resistant bus bar according to one embodiment of the present invention.

[0050] Figure 3 This is a cross-sectional view of a fire-resistant bus bar in the longitudinal direction according to one embodiment of the present invention.

[0051] Figure 4 This is a cross-sectional view of a fire-resistant bus bar in the width direction according to one embodiment of the present invention.

[0052] Figure 5 This is a plan view of a fire-resistant bus bar according to one embodiment of the present invention.

[0053] Figure 6 is a photograph of a glass fiber layer included in the fire-resistant bus bar of the present invention.

[0054] Figure 7 It is a side cross-sectional view of a fire-resistant bus bar according to another embodiment of the present invention.

[0055] Figure 8 is a perspective view of a fire-resistant bus bar according to another embodiment of the present invention.

[0056] Fig. 9 It is a plan view of a fire-resistant bus bar according to another embodiment of the present invention.

[0057] Fig.10 Schematic diagram of an example of the structure of a battery pack equipped with the fire-resistant bus bar of the present invention.

[0058] Fig.11 is a perspective view illustrating a process of installing the fire-resistant bus bar of the present invention in a battery pack.

[0059] Fig.12 It is a side cross-sectional view illustrating a state where the fire-resistant bus bar of the present invention is installed in a battery pack. DETAILED DESCRIPTION

[0060] Hereinafter, the composition of the present invention will be described in detail with reference to the drawings and various embodiments. The embodiments described below are provided as examples to help understand the present invention, the drawings are not drawn to scale to help understand the present invention, and the sizes of some components may be exaggerated.

[0061] The present invention can be embodied in a variety of different forms and implemented in various embodiments. Therefore, some embodiments are shown in the drawings and described in detail herein. However, it should be understood that the present invention is not limited to specific embodiments, including all modifications, equivalents and substitutes falling within the concept and scope of the present invention.

[0062] [Refractory Bus Bar]

[0063] The fire-resistant bus bar of the present invention includes a bus bar conductor portion, a fire-resistant silicone cover for protecting the bus bar conductor portion, and a protective layer covering the fire-resistant silicone cover.

[0064] The busbar conductor portion may be a general metal conductor portion. That is, the busbar conductor portion may be formed of a high-purity tough copper material (e.g., C1100) or an aluminum material having a purity of 99.9% or more. That is, the material of the busbar conductor portion of the present invention is not particularly limited as long as it is a metal material that can be used as a busbar conductor for connecting electrical components. Both ends of the busbar conductor portion are electrically connected to corresponding electrical connection portions.

[0065] The refractory silicone cover is ceramicized at a high temperature to support the busbar conductor portion. The refractory silicone can be ceramicized at a temperature of 500 to 1700°C. The refractory silicone of the present invention having a refractory temperature of 500°C or more is distinguished from heat-resistant silicone having a heat-resistant temperature of less than 300°C. Heat-resistant silicone is a silicone resin or rubber composition that is a material having flexibility and bendability as the characteristics of silicone, but burns or burns to ashes at a high temperature of more than 500°C. Therefore, there are limitations in the application of heat-resistant silicone to prevent a short circuit in a battery pack or to prevent heat propagation during heat propagation.

[0066] The fire-resistant silicone cover is ceramicized at high temperatures above 500° C., ie, it exhibits “fire-resistant” properties, thus maintaining the insulating and airtight properties in the battery pack even in the presence of a flame.

[0067] As described above, since the fire-resistant bus bar of the present invention contains fire-resistant silicone and improves its structure, the fire-resistant bus bar exhibits high fire-resistant performance.

[0068] Refractory silicone is a composition containing silicone resin and metal oxide as main components, and therefore exhibits flexibility and bendability as characteristics of silicone at room temperature. In addition, refractory silicone has a certain level of elasticity, and therefore exhibits high impact resistance and insulation, and when refractory silicone is exposed to high temperatures, due to the sintering of silicone resin and metal oxide, a silicone sintered body having a complex ceramic structure can be formed.

[0069] Specifically, the silicone resin contained in the refractory silicone generates silica in powder form when it burns at high temperature. The generated silica reacts with the metal oxide contained in the refractory silicone to form a "eutectic mixture" on the edge of the metal oxide, so that a bridge can be made between the silica and the metal oxide, thus resulting in the formation of a ceramic product that solidifies at the ignition temperature and solidifies when cooled. Even when an external mechanical impact is applied or moisture penetrates in the event of a fire, such a ceramic body prevents short circuits or disconnections between conductors due to damage to the refractory silicone covering, thereby performing the electrical function of the bus bar.

[0070] To this end, the fire-resistant silicone of the present invention comprises a silicone resin and a metal oxide.

[0071] The silicone resin is not particularly limited as long as it is a resin containing silicon (Si) in the molecule, but preferably contains a silicone compound represented by the following Chemical Formula 1 (hereinafter referred to as "silicone compound of Chemical Formula 1").

[0072] [Chemical formula 1]

[0073]

[0074] In Chemical Formula 1, m and n are each an integer of 10 to 30.

[0075] In Chemical Formula 1, the silicone compound includes a methylsiloxane repeating unit and a vinyl group inside and at the end of the methylsiloxane repeating unit. The vinyl group is included in the repeating unit and at the end of the silicone compound of Chemical Formula 1 to increase the degree of polymerization of the silicone resin when exposed to high temperature, thereby achieving excellent fire resistant characteristics compared to silicone compounds not containing a vinyl group.

[0076] In addition, the weight average molecular weight of the silicone compound of Chemical Formula 1 can be adjusted to a specific range. The silicone compound of Chemical Formula 1 is a compound that serves as a matrix of a silicone resin, and therefore the physical properties of the refractory silicone at room temperature and high temperature can be affected according to the weight average molecular weight of the silicone compound of Chemical Formula 1. For example, when the weight average molecular weight of the silicone compound of Chemical Formula 1 is too high, the viscosity of the silicone resin increases, and thus the reactivity may decrease during high temperature sintering, and when the weight average molecular weight is extremely low, the elasticity and flexibility of the silicone resin at room temperature decrease, thereby reducing the manufacturing processability, impact resistance, etc. of the refractory busbar. Therefore, the weight average molecular weight of the silicone compound of Chemical Formula 1 of the present invention can be adjusted to 1000 to 9000 g / mol, specifically 3000 to 8000 g / mol or 5000 to 7000 g / mol.

[0077] Furthermore, the metal oxide is a composition containing silicon oxide, and when exposed to high temperature, can serve as a crystallization nucleus to form a high-density ceramic body together with the above-mentioned silicone resin.

[0078] The metal oxide may include at least one of silicon dioxide, silica, quartz, silica, tridymite and keatite. The metal oxide may include pure silicon dioxide (SiO2) and minerals (e.g., quartz) containing silicon dioxide (SiO2) as a main component, is economically feasible, has a high melting point (high refractory) and a high degree of sintering, and may exhibit excellent electrical insulation properties. In particular, silicon dioxide, silica, quartz, etc. may help improve various properties during sintering, make refractory silicones easily dissolve and form, and reduce defects that may occur in ceramic bodies.

[0079] Furthermore, the metal oxide preferably has a crystal structure that improves fire resistance, insulation, mechanical strength, etc. when sintered with the silicone resin. The metal oxide may be in powder form, and the size may be, but not limited to, 200 μm or less, for example, 0.1 μm to 200 μm or 0.1 μm to 100 μm.

[0080] The silicone resin may further include a silicone compound represented by the following Chemical Formula 2 (hereinafter referred to as "the silicone compound of Chemical Formula 2"), which participates in sintering of the metal oxide at a high temperature together with the silicone compound of Chemical Formula 1 to form a silicone sintered body.

[0081] [Chemical formula 2]

[0082]

[0083] In Chemical Formula 2, p is an integer of 10 to 30.

[0084] The silicone compound of Chemical Formula 2 can improve the flexibility of the refractory silicone at room temperature, and induce the termination of sintering of the silicone resin by dehydration condensation with the silicone compound of Chemical Formula 1 during sintering, thereby terminating the formation reaction of the ceramic body.

[0085] To this end, the silicone compound of Chemical Formula 2 may be used in an amount of less than 10 parts by weight, for example, 0.5 to 9 parts by weight, 1 to 6 parts by weight, or 2 to 5 parts by weight, based on the total weight of the fire-resistant silicone.

[0086] In addition, the refractory silicone may include a silicone resin and a metal oxide in a certain ratio so as to achieve high elasticity at room temperature and quickly form a ceramic body when exposed to high temperature.

[0087] Specifically, in the refractory silicone, the weight ratio of the silicone resin to the metal oxide may be 1:0.5 to 1.5, specifically 1:0.8 to 1.2. When the weight ratio of the metal oxide is less than 0.5, it is difficult to obtain a ceramic structure with a high-density crystal structure at high temperature, so sufficient fire resistance and mechanical strength cannot be achieved. When the weight ratio of the metal oxide exceeds 1.5, the flexibility of the refractory silicone at room temperature is reduced, so the refractory silicone is difficult to process.

[0088] For example, the refractory silicone of the present invention may include 35 to 50 wt % of the silicone compound of Chemical Formula 1, 16 to 32 wt % of quartz, 10 to 27 wt % of silicon dioxide, and 1 to 6 wt % of the silicone compound of Chemical Formula 2, and may further include a specific solvent in some cases to improve processability during the manufacturing process of the refractory silicone.

[0089] As described above, the refractory silicone of the present invention is cured and ceramicized by sintering the silicone resin and the metal oxide at above 500° C. The refractory silicone can be ceramicized at temperatures up to 1700° C., and in theory can even remain partially ceramicized at temperatures above 1700° C. However, at temperatures above 1700° C., the time that the refractory silicone remains ceramicized may be reduced, thereby resulting in the inability to maintain the required fire resistance in the battery pack.

[0090] As described above, before ceramization, fire-resistant silicone has the same properties as rubber having bendability, flexibility and elasticity. Therefore, the fire-resistant silicone cover is easy to injection mold or apply to the busbar conductor part as described below.

[0091] The refractory silicone covering is flexible before ceramicization, so it can softly follow the deformation of the busbar conductor portion. Therefore, when the refractory busbar of the present invention is installed in a battery pack, even slight assembly tolerances can be easily coped with, thereby improving assemblability. For example, when the battery module is fastened to the battery pack by bolts, the refractory silicone covering can absorb the movement or slight deformation of the busbar conductor portion engaged with the battery module. In addition, even if the battery pack vibrates due to the vibration of the electric vehicle, the refractory silicone covering can naturally absorb the vibration.

[0092] In particular, the fire-resistant busbar of the present invention is characterized in that the fire-resistant silicone covering not only includes a main body covering portion surrounding the main body of the busbar conductor portion, but also includes a cap portion covering both ends of the busbar conductor portion. The cap portion is integrally joined to the main body covering portion, so unlike the prior art, there is no need to use a separate tape to connect the cap portion to the busbar or cover the covering portion of the busbar body. Therefore, the connection strength of the cap portion and the main body covering portion is further improved. The fire-resistant busbar can be manufactured by integrally molding the cap portion and the main body covering portion, thereby simplifying the manufacturing process. In addition, the cap portion is formed of fire-resistant silicone, so it can be ceramicized at high temperature to protect the busbar conductor portion and its electrical connection portion together, thereby greatly enhancing the insulation performance and airtightness.

[0093] Meanwhile, when refractory silicone is ceramicized at high temperature, refractory silicone is thermally and electrically insulated, but its mechanical strength is slightly reduced, so refractory silicone may be destroyed by external force. According to the present invention, a protective layer is provided to cover the refractory silicone covering, thereby structurally improving the rigidity of the refractory silicone covering.

[0094] The protective layer is a layer that covers the outside of the fire-resistant silicone covering to prevent the fire-resistant silicone covering from being directly exposed to flames. That is, the protective layer mainly acts as a firewall. In addition, when the fire-resistant silicone covering is ceramicized, the protective layer covers the ceramicized covering to maintain the overall shape and size of the ceramicized covering.

[0095] The material of the protective layer may be, for example, a glass fiber or mica material having insulation and heat resistance. For example, by wrapping a glass fiber tape or a mica tape around the fire-resistant silicone cover, the fire-resistant silicone cover may be prevented from being exposed to the outside. However, the protective layer is not limited thereto and may be formed of a different material having excellent insulation or heat resistance.

[0096] The shape of the refractory bus bar will be described in detail with respect to the following embodiments.

[0097] (First Embodiment)

[0098] Figure 2 It is a perspective view of a fire-resistant bus bar according to one embodiment of the present invention. Figure 3This is a cross-sectional view of a fire-resistant bus bar in the longitudinal direction according to one embodiment of the present invention. Figure 4 This is a cross-sectional view of a fire-resistant bus bar in the width direction according to one embodiment of the present invention. Figure 5 This is a plan view of a fire-resistant bus bar according to one embodiment of the present invention. Figure 6 is a photograph of a glass fiber layer included in the fire-resistant bus bar of the present invention.

[0099] In the following drawings, the “X-axis direction” may be understood as indicating the length direction of the refractory busbar 100 , the “Y-axis direction” may be understood as indicating the width direction of the refractory busbar 100 , and the “Z-axis direction” may be understood as indicating the height direction of the refractory busbar 100 .

[0100] like Figure 2 and Figure 3 As shown, the fire resistant bus bar 100 includes a bus bar conductor portion 110 and a protective cover that protects the bus bar conductor portion 110 from contaminants (dirt, dust, etc.) or flames.

[0101] like Figure 2 and Figure 3 As shown, the busbar conductor portion 110 is located at the innermost side of the fire-resistant busbar 100. Both ends 111 of the busbar conductor portion 110 may be provided with fastening holes 111a for being coupled to corresponding electrical connection portions (e.g., the busbar conductor portion 110 of another fire-resistant busbar or the terminal portions 210 and 220 of the battery module) by fasteners B.

[0102] The protective cover includes caps C located at both ends 111 of the busbar conductor portion 110 and a central cover portion P located on the body 112 of the busbar conductor portion 110 between the both ends 111. The caps C are integrally joined to the central cover portion P. The protective cover may include a fire-resistant silicone cover 120 covering at least the upper surface of the busbar conductor portion 110 and a protective layer 130 covering the fire-resistant silicone cover 120.

[0103] The fire-resistant silicone cover 120 includes a cap portion 121 covering both ends 111 of the bus bar conductor portion 110 , and a main body cover portion 122 covering the main body 112 of the bus bar conductor portion 110 between the both ends 111 .

[0104] The cap C of the protective cover may be formed using only the cap portion 121. Alternatively, the cap C of the protective cover may be formed by covering the cap portion 121 with a cap protective layer 131 of a protective layer described below. The central cover P may be formed only by the body cover portion 122, or by covering the body cover portion 122 with a body protective layer 132 of a protective layer described below.

[0105] The cap portion 121 includes a through hole H extending from the upper surface of the cap portion 121 to the surface of the cap portion 121 in contact with the bus bar conductor portion 110 .

[0106] The through hole H is provided at a position corresponding to the fastening hole 110a of the busbar conductor portion 110. Therefore, in the process of fastening the fire-resistant busbar 100 to the electrical connection portion of another electrical device, it is not necessary to expose the fastening hole 110a by folding the cap portion 121 or the cap C so as to install the fastener B in the fastening hole 110a. That is, the fastener B can be installed in the fastening hole 110a by inserting the fastener B into the through hole H and moving the fastener B forward along the through hole H. In this case, the fastener B can pass through the fastening hole 110a and protrude to the back of the busbar conductor portion 110 to be connected to the electrical connection portion of the other electrical device. As described above, the fire-resistant busbar 100 and another electrical connection portion can be conveniently connected through the through hole H. In addition, there is no need to further deform (e.g., fold) the cap portion 121 or the cap C to expose the fastening hole 110a, thereby minimizing damage to the fire-resistant bus bar 100 when the fire-resistant bus bar 100 is connected to another electrical connection portion. In addition, it is possible to prevent a folding line from occurring at the interface between the cap C and the central cover portion P due to further deformation. Therefore, the structural rigidity of the fire-resistant bus bar 100 can be improved.

[0107] The fastener B may be interference-fitted into the through-hole H. To this end, the through-hole H may have a diameter smaller than a diameter of a head BH of the fastener B inserted into the through-hole H to be engaged to the busbar conductor portion 110 .

[0108] The fire-resistant busbar 100 can be transported while the fastener B is inserted into the through hole H. In this case, the length of the through hole H in the height direction Z can be equal to or greater than the length of the fastener B in the height direction Z, so that the fastener B can be protruding to the outside of the fire-resistant busbar 100 without being exposed. As described above, the fastener B is located in the through hole H, so when the fastener B passes through the fastening hole 111a of the fire-resistant busbar 100 and is engaged to the corresponding electrical connection part (for example, the busbar conductor part 110 of another fire-resistant busbar or the terminal parts 210 and 220 of the battery module), the exposed end of the fastener B can be accommodated in the through hole H. Therefore, the fastener B can be protected by the cap part 121 to prevent short circuits caused by contact with other external parts. The fastener B can be a general bolt for connecting busbars.

[0109] The cap portion 121 may include a through hole H, a first cover portion 121a covering the upper surface of the two ends 111 of the busbar conductor portion, and a first extended cover portion 121b extending downward from the first cover portion 121a to cover the side surfaces of the two ends 111. As described above, the cap portion 121 may cover the upper surface and side surfaces of the two ends 111 to protect the two ends 111 of the busbar conductor portion 110 from pollutants or flames. The lower surface of the busbar conductor portion 110 may be exposed to contact with another electrical connection portion.

[0110] like Figure 3 As shown, the body cover portion 122 may extend between the cap portions 121 in the length direction X of the busbar conductor portion 100 .

[0111] The body cover part 122 may have a shape corresponding to the shape of the body 112 of the bus bar conductor part 110 .

[0112] like Figure 4 As shown, the main body cover 122 may include a second cover 122a covering the upper surface of the main body 112 and a second extension cover 122b extending downward from the second cover 122a to cover the side of the main body 112. The main body cover 122 may also include a third cover 122c covering the lower surface of the main body 112 and connected to the second extension cover 122b. As described above, the main body cover 122 may cover the entire main body 112 to protect the main body 112 of the busbar conductor part 110 from foreign matter or flames.

[0113] The cap portion 121 and the main body covering portion 122 of the refractory silicone covering 120 are integrally molded. For example, the refractory silicone covering 120 can be molded by injecting refractory silicone into a mold (not shown) having the shape of the cap portion 121 and the main body covering portion 122 of the refractory silicone covering 120. As described above, the refractory silicone can be, for example, a mixture of a silicone resin and a metal oxide, and can be contained in a specific solvent in the form of a coating liquid or slurry having fluidity. The refractory silicone covering 120 can be molded separately from the busbar conductor portion 110 by injecting the refractory silicone coating liquid or slurry into the mold. The refractory silicone covering 120 of the present invention can be obtained by removing the mold after performing a drying and curing process.

[0114] In this case, by inserting the busbar conductor part 110 into the main body covering part 122 of the molded fire-resistant silicone cover 120 in the length direction, the main body of the busbar conductor part 110 can be covered with the main body covering part 122. In this case, the cap part 121 of the molded fire-resistant silicone cover 120 is provided on both ends 111 of the busbar conductor part 110 to cover the both ends 111.

[0115] As described above, the fire-resistant silicone cover 120 may be molded separately from the bus bar conductor portion 110 and joined to the bus bar conductor portion 110, but the molding of the fire-resistant silicone cover 120 and the covering of the bus bar conductor portion 110 with the fire-resistant silicone cover 120 may be performed simultaneously by so-called insert injection molding. When the latter method is used, the manufacturing process can be further simplified, thereby improving productivity.

[0116] That is, the busbar conductor part 110 is inserted, and a refractory silicone coating liquid or slurry is injected into an insert injection molding mold (not shown) having the shape of the refractory silicone cover 120 along the periphery of the busbar conductor part 110. In this case, as the inside of the mold is filled with refractory silicone while the busbar conductor part 110 is covered with refractory silicone, the refractory silicone cover 120 having the above shape is formed. Figure 3 As shown, the fire-resistant silicone cover 120 including the busbar conductor part 110 therein may be obtained by removing the mold after the drying and curing process.

[0117] like Figure 3 and 4 As shown, the protective layer 130 is disposed on the fire-resistant silicone cover 120. For example, the fire-resistant bus bar 100 of the present invention can be obtained by winding a tape (such as a glass fiber tape or a mica tape) of the protective layer 130 around the fire-resistant silicone cover 120. In the drawings of this specification, the exposed protective layer 130 is shown in the shape of a lattice grid.

[0118] The protection layer 130 includes a cap protection layer 131 covering the cap portion 121 and a main body protection layer 132 covering the main body covering portion 122 .

[0119] The shape of the protective layer 130 may match the shape of the fire-resistant silicone cover 120. For example, the cap protective layer 131 may include a first protective layer 131a covering the outer surface of the first cover portion 121a and a first side protective layer 131b covering the outer surface of the first extension cover portion 121b. In addition, the body protective layer 132 may cover the entire outer surface of the body cover portion 122 so that the body cover portion 122 may not be exposed to the outside.

[0120] like Figure 3 As shown, the first protective layer 131a may cover only the outer periphery of the through hole H to maintain the open state of the through hole H. In this case, the total weight of the fire-resistant bus bar 100 can be reduced while saving the material consumed in manufacturing the protective layer 130. In addition, when the fire-resistant bus bar 100 is placed at the installation position, the fire-resistant bus bar 100 can be easily connected to another electrical connection portion through the open through hole H.

[0121] As the protective layer 130, a glass fiber or mica material having insulation and heat resistance may be used. For example, the fire-resistant silicone cover 120 may be prevented from being exposed to the outside by wrapping a glass fiber tape or a mica tape around the outside of the fire-resistant silicone cover 120. Figure 6 A photograph of a glass fiber layer is shown.

[0122] Glass fiber is an inorganic fibrous material mainly composed of silicate. The glass fiber may be in the form of a glass fiber fabric obtained by weaving yarns formed by twisting and winding glass fiber filaments (see Figure 6 (a)), or may be in the form of a nonwoven fabric (see Figure 6 (b) in the figure). The fire-resistant bus bar 100 of the present invention may be manufactured by applying an adhesive to a glass fiber fabric or a non-woven fabric and attaching the glass fiber fabric or the non-woven fabric to the fire-resistant silicone cover 120. Glass fiber has fire resistance and high electrical insulation.

[0123] Mica is a type of silicate mineral, having a layered structure, generally having a hexagonal crystal shape, and is used as an electrical insulating material or a heat insulating material. Mica exhibits better fire resistance than glass fiber. Therefore, mica is more preferably used as a protective layer to protect the fire-resistant silicone covering. However, the protective layer is not limited thereto, and may be formed of a different material having excellent insulation or heat resistance.

[0124] For example, the protective layer 130 may be formed by winding a tape of the protective layer 130 processed in the form of a tape around the refractory silicone cover 120. However, the method of forming the protective layer 130 is not limited thereto. For example, the protective layer 130 may be formed on the refractory silicon cover 120 by coating, applying, spraying or other known methods.

[0125] (Second Embodiment)

[0126] Figure 7 It is a side cross-sectional view of a fire-resistant bus bar according to another embodiment of the present invention. Figure 8 is a perspective view of a fire-resistant bus bar according to another embodiment of the present invention. Fig. 9 It is a plan view of a fire-resistant bus bar according to another embodiment of the present invention.

[0127] The fire-resistant busbar 100' of the present embodiment is different from the fire-resistant busbar 100 of the first embodiment in that the through hole H includes a first hole H1 and a second hole H2 having different diameters. In addition, the same components of the fire-resistant busbar 100' as those of the fire-resistant busbar 100 of the first embodiment can also be applied to the present embodiment, so their detailed description is omitted here.

[0128] Similar to the through hole H of the first embodiment, the first hole H1 is provided at a position corresponding to the fastening hole 110a of the busbar conductor portion 110. Therefore, the fastener B can be provided at the mounting position simply by inserting the fastener B into the first hole H1. The diameter of the first hole H1 may be smaller than the diameter of the head BH of the fastener B to interference fit the fastener B into the first hole H1. In this case, the fastener B can be transferred when inserted into the first hole H1.

[0129] The length of the first hole H1 in the height direction Z may be greater than the length of the head BH of the fastener B in the height direction Z.

[0130] The second hole H2 may be located below the first hole H1 and connected to the first hole H1. The diameter of the second hole H2 is greater than the diameter of the head BH of the fastener B. Figures 7 to 9 As shown, the diameter of the second hole H2 is larger than the diameter of the first hole H1. Therefore, when the head BH of the fastener B passes through the first hole H1, the resistance caused by the interference fit between the head BH of the fastener B and the inner wall of the first hole H1 disappears. As described above, when the head BH of the fastener B enters the second hole H2, the resistance applied to the fastener B is minimized, so the tightening torque of the fastener B can be constantly managed. By providing the second hole H2 having a diameter larger than the first hole H1, the tightening quality of each component can be uniformly maintained. In addition, the amount of material used to manufacture the refractory busbar 100' can be reduced and the mass of the refractory busbar 100' can be reduced as much as the space occupied by the second hole H2.

[0131] The total height of the first hole H1 and the second hole H2 in the height direction Z may correspond to or be greater than the length of the fastener B in the height direction Z. Therefore, when the fire-resistant bus bar 100' is transferred with the head BH of the fastener B inserted into the first hole H1, the fastener B is not exposed to the outside of the fire-resistant bus bar 100'. In this case, the length of each of the first hole H1 and the second hole H2 in the height direction Z may be appropriately selected in consideration of the length of the head BH of the fastener, the total length of the fastener B, the mass of the fire-resistant bus bar 100', and the like.

[0132] like Fig. 9 As shown, a cut slit S connected to the through hole H may be provided around the through hole H of the cap portion 121. Therefore, when the fastener B is inserted into the first hole H1 or the through hole H, the cut slit S is opened, thereby facilitating elastic deformation around the through hole H of the cap portion 121. Therefore, the fastener B can be easily inserted into the first hole H1 or the through hole H, and the structural resistance around the through hole H that may be generated during the fastening operation can be reduced, thereby minimizing damage to the periphery of the through hole H of the cap portion 121 and the head BH of the fastener B.

[0133] (Battery Pack)

[0134] Fig.10 Schematic diagram of an example of the structure of a battery pack equipped with the fire-resistant bus bar of the present invention. Fig.11 is a perspective view illustrating a process of installing the fire-resistant bus bar of the present invention in a battery pack. Fig.12 It is a side cross-sectional view illustrating a state where the fire-resistant bus bar of the present invention is installed in a battery pack.

[0135] The fire-resistant bus bars 100 and 100' of the present invention described above each include a fire-resistant silicone cover 120 ceramicized at a high temperature and a protective layer 130 covering the fire-resistant silicone cover 120 to maintain its shape. Therefore, by applying the fire-resistant bus bar 100 or 100' to a battery pack where fire may occur, the safety of the battery pack can be greatly improved.

[0136] The fire-resistant bus bar 100 or 100' may be used to electrically connect a plurality of battery modules 200 in, for example, a battery pack. In this case, the fire-resistant bus bar 100 or 100' may electrically connect the terminal portions 210 and 220 of adjacent battery modules 200. Alternatively, the fire-resistant bus bar 100 or 100' may be used to connect the battery module to an external electrical device.

[0137] In particular, the high voltage terminal parts 210 and 220 of the battery module generate relatively high heat due to high current. Therefore, when a flame occurs in the battery pack, high heat may be concentrated on the high voltage terminal parts 210 and 220. Therefore, the fire-resistant busbars 100 and 100' of the present invention can be used as high voltage busbars that electrically connect the high voltage terminal parts of a plurality of battery modules.

[0138] The battery pack 1000 of the present invention may include a plurality of battery modules 200 , fire-resistant bus bars 100 and 100 ′ for electrically connecting the battery modules 200 , and a battery pack case 400 accommodating the battery modules 200 .

[0139] Figure 8 It is shown that a plurality of battery modules 200 are accommodated in a battery pack housing 400. The battery modules 200 each include a cell stack (not shown) in which a plurality of battery cells are stacked, and cell leads (or terminals) with different polarities are led out from the battery cells of the cell stack. In this case, the type of battery cell is not particularly limited. That is, a prismatic, cylindrical, or pouch-shaped battery cell can be accommodated in the battery module 200.

[0140] The cell leads are electrically connected to a bus bar, such as a terminal bus bar or an internal bus bar. The fire-resistant bus bar 100 or 100 ′ of the present invention can be used to electrically connect a plurality of battery modules 200 .

[0141] at the same time, Fig.10A conventional battery module 200 is shown in which the module housing completely surrounds the upper, lower, left and right sides of the battery cell stack. However, the present invention is not limited thereto, and the fire-resistant busbar of the present invention may also be used, for example, in a battery module having a module-free module housing in which at least one of the upper, lower, left and right sides of the battery cell stack is open, or a battery cell block in which the upper, lower, left and right sides of the battery cell stack are all open. As described above, a battery pack having a so-called core-to-pack structure may be constructed by installing therein a cell block or a battery module in which part or all of the module housing is omitted. The fire-resistant busbar 100 or 100' of the present invention may be used for the electrical connection of a cell block or a module-free battery module installed in such a battery pack having a core-to-pack structure.

[0142] The battery pack housing may further include a partition wall 300 installed between the battery modules. The partition wall 300 may be installed on the bottom plate of the battery pack housing while extending in the length direction or the width direction of the battery pack housing. As described above, by installing the partition wall 300 in the battery pack housing, the structural rigidity of the battery pack housing may be improved. To this end, the partition wall 300 may be formed of a metal material.

[0143] The height of the partition wall 300 may be less than the height of the battery module 200. More specifically, the height of the partition wall 300 may be less than the height at which the terminal portions 210 and 220 of the battery module 200 are located in the battery module 200. In this case, the fire-resistant bus bar 100 connected to the terminal portions 210 and 220 of the adjacent battery module is disposed on the upper surface of the partition wall 300 or is spaced apart from the upper surface of the partition wall 300. As described above, when the height of the partition wall 300 is less than the height of the battery module 200, both ends of the bus bar conductor portion of the fire-resistant bus bar can be easily electrically connected to the terminal portions of the battery module 200 on both sides of the partition wall 300.

[0144] Or, if Figures 10 to 12 As shown, the height of the partition wall 300 can be set to correspond to or be greater than the height of the battery module 200. In this case, the adjacent battery modules 200 can be isolated from each other. Therefore, even when a fire occurs in a specific battery module 200, the flame can be delayed or prevented from spreading to the adjacent battery module 200.

[0145] In this case, a bus bar installation through hole 310 or a bus bar installation groove 320 may be provided in the partition wall 300 . Fig.10 It is shown that the busbar mounting through-holes 310 are provided in the partition wall 300 . Fig.11 It is shown that the busbar mounting groove 320 is provided in the partition wall 300. In terms of fire protection and air tightness, the partition wall is preferably provided with Fig.10 The bus bar mounting through-hole 310 is shown. Fig.11 The upper portion of the bus bar mounting groove 320 is open, thus facilitating the installation and electrical connection of the bus bar.

[0146] The fire-resistant busbars 100 and 100' may be placed in the busbar installation through-holes 310 or the busbar installation grooves 320. In this case, both ends 111 of the busbar conductor portion of the fire-resistant busbar are electrically connected to the terminal portions 210 and 220 of the battery module 200 on both sides of the partition wall 300.

[0147] Fig.11 and 12 The electrical connection of the battery modules 200 in the battery pack 1000 through the fire-resistant busbar 100 is shown. The partition wall 300 is located between adjacent battery modules 200. The busbar mounting groove 320 may be provided in the partition wall 300. The fire-resistant busbar 100 of the present invention is placed in the busbar mounting groove 320. The fire-resistant busbar 100 is formed in a shape corresponding to the busbar mounting groove 320. Therefore, the fire-resistant busbar 100 of the present invention can be in airtight contact with the partition wall 300 surface. Therefore, the battery modules 200 arranged adjacent to each other can be more airtightly isolated from each other, and the flame can be more effectively prevented from spreading between the battery modules 200.

[0148] The cap C formed integrally with the fire-resistant bus bar 100 covers the two ends 111 and the portions of the terminal parts 210 and 220 connected to each other. Therefore, unlike the prior art, the cap can be connected to the fire-resistant bus bar while installing it, without the need to connect the cap to the bus bar separately. In addition, the fire-resistant bus bar 100 and the terminal parts 210 and 220 can be easily connected through the through hole H in the cap C.

[0149] At the same time, in the fire-resistant busbar 100 of the present invention, when a flame occurs in the battery pack 1000, the main body covering portion 122 and the cap portion 121 covering the busbar conductor portion 110 are simultaneously ceramicized to form a dense sintered body. That is, at a high temperature of more than 500°C, unlike conventional heat-resistant silicones that burn or burn to ashes, the main body covering portion 122 and the cap portion 121 are ceramicized and thus maintain their shape. Therefore, even if a flame occurs, the fire-resistant silicone cover 120 stably supports the busbar conductor portion 110. In addition, the protective layer 130 prevents the fire-resistant silicone cover 120 from direct contact with the flame, thereby preventing deformation of the fire-resistant silicone and further enhancing insulation and fire resistance.

[0150] [Example]

[0151] [Experimental example]

[0152] (Experimental Example 1)

[0153] A refractory silicone containing 50 wt% of the silicone compound of Chemical Formula 1, 20 wt% of quartz and 30 wt% of pure silicon dioxide is applied to a surface having a cross-sectional area selected from 0.5 to 3 mm in a certain thickness. 2The copper busbar conductor portion of the busbar excluding both ends thereof. A glass fiber tape (product name: AGT6WO, manufactured by SWECO) having a thickness of 0.18 mm was wound twice around the fire-resistant silicone coated busbar to prepare the fire-resistant silicone coated busbar of Example 1.

[0154] A mica tape (product name: SA765, manufactured by SWECO) having a thickness of 0.18 mm was wound twice around the fire-resistant silicone coated bus bar to prepare a fire-resistant silicone coated bus bar of Example 2.

[0155] The bus bar of Comparative Example 1 was prepared by setting the length of the bus bar conductor portion and the length of the exposed portions at both ends of the bus bar conductor portion to be the same as those of Examples 1 and 2, and winding an AGT6WO glass fiber tape around the central portion of the bus bar conductor portion. The thickness of the covering of the wound glass fiber tape was set to be substantially the same as that of Example 1.

[0156] The bus bar of Comparative Example 2 was prepared by winding the SA765 mica tape once around the central area of ​​the bus bar conductor portion and winding the glass fiber tape of Comparative Example 1 once around the mica tape. The length of the bus bar conductor portion and the length of the exposed portions at both ends thereof were the same as those of Examples 1 and 2 and Comparative Example 1.

[0157] In order to test the insulation properties (insulation retention performance) in the event of a fire, copper wire was wound around the covering portion (coating portion or tape-wound portion) of each busbar of Examples 1 and 2 and Comparative Examples 1 and 2 by the same number of turns, one end of the outermost copper wire of the covering portion was connected to the negative terminal of the withstand voltage tester, and one end of each busbar conductor portion was connected to the positive terminal of the withstand voltage tester. While a voltage of 1000 V was applied to the busbar by the withstand voltage tester, the entire surface of the busbar was uniformly heated by a large spray gun with a flame temperature of 1100 to 1150°C.

[0158] The insulation failure time at which the insulation state is destroyed (ie, a short circuit occurs) was measured under the above voltage and heating temperature conditions, and the measurement results are shown in Table 1 below.

[0159] [Table 1]

[0160] Experimental Example 1 Busbar Configuration Insulation failure time Comparative Example 1 Copper busbar conductor + glass fiber tape 1 minute 35 seconds Comparative Example 2 Copper busbar conductor + mica tape + glass fiber tape 10 minutes 30 seconds Example 1 Copper busbar conductor + fire-resistant silicone cover + glass fiber tape 14 points Example 1 Copper busbar conductor + fire-resistant silicone cover + mica tape 15 minutes 30 seconds

[0161] As shown in Table 1 above, the busbar with the fire-resistant silicone cover and the protective layer of the present invention has the longest insulation failure time, and shows a significant difference from Comparative Examples 1 and 2 in terms of insulation failure time. Therefore, it can be seen that the insulation characteristics of the fire-resistant busbar with the fire-resistant silicone cover and the protective layer of the present invention are excellent. In particular, the insulation performance of Example 2 using the mica tape as the protective layer is better than the insulation performance of the example using the glass fiber tape as the protective layer.

[0162] (Experimental Example 2)

[0163] While changing the weight ratio of the silicone compound of Chemical Formula 1 to the metal oxide, fire-resistant silicones having the compositions shown in the following Table 2 were prepared.

[0164] Under the same conditions as in Experimental Example 1, the fire-resistant silicone of Examples 1-1 to 1-5 was each applied to a copper busbar conductor portion at a certain thickness, an AGT6WO glass fiber tape was wrapped around it, and a copper wire was wrapped around the busbar cover layer under the same conditions as in Experimental Example 1, and connected to a withstand voltage tester.

[0165] Furthermore, heating was performed by a large spray gun while applying a voltage under the same conditions as in Experimental Example 1, and the insulation failure time was measured. The measurement results are shown in Table 2 below.

[0166] [Table 2]

[0167]

[0168] In the above Examples 1 to 5, the weight ratio of the silicone compound to the metal oxide was 1:1, 1:0.5, 1:1.5, 1:0.4, and 1:1.6. The insulation failure times of all Examples 1 to 5 were much longer than those of Comparative Examples 1 and 2. However, in the case of Example 1-4 where the weight ratio was less than 1:0.5, the insulation failure time was slightly shorter because it was considered that the amount of the ceramic structure having a high-density crystal structure at high temperature was slightly insufficient due to the insufficient amount of the metal oxide. In the case of Example 1-5 where the weight ratio was 1:1.6, the insulation failure time was sufficiently long, but the amount of the metal oxide was too much, so the flexibility of the refractory silicone at room temperature was reduced, resulting in difficulty in coating the busbar conductor portion with the refractory silicone.

[0169] The present invention is described in more detail above with reference to the accompanying drawings, embodiments, etc. However, the embodiments described in this specification or the structures shown in the accompanying drawings are merely embodiments of the present invention and do not reflect all technical concepts of the present invention. Therefore, it should be understood that various equivalents and modifications to replace these structures already exist on the filing date of the present application.

[0170] (reference numerals)

[0171] 100, 100': Fire-resistant busbar

[0172] P: Central covering part

[0173] C: Block

[0174] 110: Busbar conductor part

[0175] 111: Both ends

[0176] 120: Fire-resistant silicone covering

[0177] 121: Blocking Department

[0178] H: Through hole

[0179] 122: Main body covering part

[0180] 130: Protective layer

[0181] 131: Cap protection layer

[0182] 132: Main body protection layer

[0183] B: Fasteners

[0184] 200: Battery module

[0185] 210, 220: Terminals

[0186] 300: Partition wall

[0187] 310: Busbar mounting through hole

[0188] 320: Busbar installation groove

[0189] 400: Battery pack housing

[0190] 1000: Battery pack

Claims

1. A fire-resistant busbar, comprising: busbar conductor portion; a refractory silicone cover comprising: a cap portion covering both ends of the bus bar conductor portion; and a main body cover portion integrally joined to the cap portion while covering the main body of the bus bar conductor portion between the both ends, the refractory silicone cover being ceramicized at a high temperature to support the bus bar conductor portion; and a protective layer covering the fire-resistant silicone covering, in, A through hole extending from an upper surface of the cap portion to a surface of the cap portion in contact with the bus bar conductor portion is formed in the cap portion.

2. The fire-resistant bus bar according to claim 1, wherein: The refractory silicone is ceramized at a temperature of 500°C to 1700°C.

3. The fire-resistant bus bar according to claim 1, wherein: The refractory silicone is ceramized by sintering a metal oxide containing silicon oxide and a silicone resin containing a silicone compound represented by Chemical Formula 1: [Chemical formula 1] In Chemical Formula 1, m and n are each an integer of 10 to 30.

4. The fire-resistant bus bar according to claim 3, wherein: The weight ratio of the silicone to the metal oxide is 1:0.5 to 1:1.

5.

5. The fire-resistant bus bar according to claim 3, wherein: The metal oxide containing silicon oxide includes at least one of pure silicon dioxide, silica, quartz, silica, tridymite and keatite.

6. The fire-resistant bus bar according to claim 1, wherein: The protective layer includes a glass fiber layer or a mica layer.

7. The fire-resistant bus bar according to claim 1, wherein: The through hole has a diameter smaller than a diameter of a head of a fastener configured to be inserted into the through hole to be engaged to the bus bar conductor portion.

8. The fire-resistant bus bar according to claim 1, wherein: The through hole comprises: a first hole having a diameter smaller than a diameter of a head of a fastener configured to be engaged to the bus bar conductor portion while passing through the through hole; and A second hole having a diameter greater than a diameter of the head of the fastener.

9. The fire-resistant bus bar according to claim 1, wherein: A cut slit connected to the through hole is provided around the through hole of the cap portion.

10. The fire-resistant bus bar according to claim 1, wherein: The cap portion includes a first covering portion and a first extending covering portion, the first covering portion including the through hole inside and configured to cover the upper surfaces of the two ends, the first extending covering portion extending downward from the first covering portion to cover the side surfaces of the two ends, and The main body cover includes a second covering portion and a second extending covering portion, the second covering portion being configured to cover an upper surface of the main body, and the second extending covering portion extending downward from the second covering portion to cover a side surface of the main body.

11. The fire-resistant bus bar according to claim 1, wherein: The fire-resistant bus bar includes a high-voltage bus bar configured to electrically connect high-voltage terminal portions of a plurality of battery modules.

12. The fire-resistant bus bar according to claim 1, wherein: The bus bar conductor portion is covered with the fire-resistant silicone cover by insert injection molding by injecting the fire-resistant silicone into a mold in which the bus bar conductor portion is inserted.

13. A battery pack comprising: Multiple battery modules; The fire-resistant bus bar according to any one of claims 1 to 12, wherein the fire-resistant bus bar is configured to electrically connect the plurality of battery modules; and A battery pack casing is configured to accommodate the plurality of battery modules therein.

14. The battery pack according to claim 13, wherein: The battery pack housing includes partition walls installed between the plurality of battery modules. Both ends of the busbar conductor portion of the fire-resistant busbar are electrically connected to the terminal portions of the battery modules located on both sides of the partition wall, and The cap portion of the fire-resistant bus bar covers portions where the two ends and the terminal portion are connected to each other.

15. The battery pack according to claim 14, wherein: The partition wall is provided with a busbar installation through hole or a busbar installation groove, and The fire-resistant busbar is disposed in the busbar installation through-hole or the busbar installation groove.

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