Fire-resistant busbars and battery packs including them.

Abstract

The present invention relates to a bus bar that includes a metal plate and a plurality of insulating members provided on the outer surface of the metal plate, at least some of the plurality of insulating members forming a chemical bond with the metal plate, thereby ensuring insulation even in the event of a fire, and improving safety.

Description

Technical Field

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0114234 filed on September 8, 2022, and Korean Patent Application No. 10-2023-0118950 filed on September 7, 2023, and all the contents disclosed in the Korean patent applications are incorporated herein by reference.

[0002] The present invention relates to a busbar with improved fire resistance for connecting battery modules, and more particularly, to a busbar with improved fire resistance provided with a plurality of insulating members on a metal plate formed of an electrically conductive metal material to protect the metal plate from the outside, and a battery pack including the same.

Background Art

[0003] Recently, due to air pollution caused by the use of fossil fuels and the depletion of energy, the demand for secondary batteries capable of storing electrical energy produced by the development of alternative energy has been increasing. Rechargeable secondary batteries are closely used in daily life such as mobile devices, electric vehicles, and hybrid electric vehicles.

[0004] Lithium secondary batteries used as an energy source for various electronic devices essential in modern society are increasing in required capacity due to the increasing use and complexity of mobile devices and the development of electric vehicles and the like. To meet the needs of users, a large number of battery cells are arranged in small devices, but battery modules that electrically connect a large number of battery cells or battery packs including a large number of such battery modules are used in vehicles and the like.

[0005] As the types of devices using lithium secondary batteries as an energy source become diverse, the application of lithium secondary batteries has also been extended to devices that require high capacity and high output.

[0006] In response to this trend, the manufacture and use of battery modules, which electrically connect a large number of battery cells, and battery packs, which connect such battery modules in series and / or parallel, are increasing.

[0007] On the other hand, busbars are widely used as the electrical connection means for the battery module. Busbars are useful as a means of conducting high currents because they can stably carry large currents even though they are relatively thinner than cables.

[0008] Generally, busbars can be supplied in the form of metal bars such as copper or aluminum with good electrical conductivity, and for safety, the remaining portion of the metal bar, excluding the ends connected to the terminals, is covered with a tube or injection molding.

[0009] Specifically, the busbar can be used in a form in which a metal plate containing copper or aluminum, which has excellent electrical conductivity, is placed inside, and the remaining portion of the outer surface of the metal plate, excluding the two ends that are joined to ensure electrical insulation, is covered with a tube or injection molding.

[0010] In this regard, Figure 1 is a perspective view showing a conventional busbar before and after damage caused by fire.

[0011] Busbars are used for electrical connections between battery modules. Figure 1 shows the structure of a busbar and a busbar damaged by fire.

[0012] Referring to Figure 1, a conventional busbar includes a metal plate 110 made of an electrically conductive material, an insulating tape 120 surrounding the remaining portion of the outer surface of the metal plate 110 excluding both ends, and a silicone tube 130 provided on the outer surface of the insulating tape 120.

[0013] Since the insulating tape 120 and the silicone tube 130 are made of electrically insulating material, insulation can be ensured for components other than the devices connected to both ends of the busbar.

[0014] If a battery cell inside a battery pack ignites or explodes, the thermal energy from that cell is transferred to surrounding battery cells, causing a fire. If the fire in a battery cell damages the silicone tube 130 of the busbar connecting the battery modules, the insulating tape 120 may spread, exposing the metal plate 110 inside.

[0015] When exposed metal plates come into contact with electrically conductive battery pack structures, a short circuit can occur. Such an internal short circuit can form an electrically closed circuit inside the battery pack, which can accelerate thermal runaway within the battery pack.

[0016] In this regard, Patent Document 1 discloses a bus bar comprising: a metal bar formed of a metal material; an insulating tube covering the remaining portion of the metal bar excluding both ends; a fire-resistant tape surrounding the metal bar inside the insulating tube; and a bandage member made of a fire-resistant material, interposed between the insulating tube and the fire-resistant tape, surrounding the fire-resistant tape and fixing it to the metal bar.

[0017] Patent Document 1 states that even if the insulating tube is destroyed by fire, the bandage member can firmly secure the fireproof tape, thus preventing the metal bar from directly contacting surrounding metal objects and thus preventing short circuits.

[0018] Patent Document 2 discloses a bus bar comprising a metal bar made of a metal material, a bandage member surrounding the remaining portion of the metal bar excluding both ends, and an insulating tube surrounding the metal bar and the bandage member together.

[0019] In Patent Document 2, since the bandage member on the surface of the metal bar maintains its attachment to the surface of the metal bar even during a fire, the metal bar can be prevented from coming into direct contact with surrounding metal objects and causing a short circuit.

[0020] However, since the busbars of Patent Document 1 and Patent Document 2 further include a bandage member, the thickness and weight of the busbar can increase.

[0021] When a fire occurs inside the battery pack, the tube or injection molding surrounding the metal bar disappears, and as a result, the metal bar can be exposed to the outside. There is a problem that a short circuit occurs when the metal bar exposed to the outside comes into contact with surrounding metal objects.

[0022] In addition, in reality, there is no solution that can actively deal with flames only with a busbar equipped with a heat-resistant insulator that is resistant to fire.

[0023] Therefore, there is a need for a technology for a busbar that can prevent the metal bar or metal plate inside from being exposed even if the insulating material provided on the outer surface of the busbar is disappeared by a fire, and can prevent the spread of flames between battery modules during a fire.

Prior Art Documents

Patent Documents

[0024]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0025] The present invention is for solving the above problems, and an object thereof is to provide a bus bar with improved fire resistance having a plurality of insulating members on an outer surface to protect a metal plate formed of an electrically conductive metal material from the outside, and a battery pack including the same.

Means for Solving the Problems

[0026] The bus bar according to the present invention includes a metal plate and a plurality of insulating members provided on an outer surface of the metal plate, and at least a part of the plurality of insulating members can form a chemical bond with the metal plate.

[0027] The plurality of insulating members include a first insulating member provided on the metal plate and a second insulating member provided so as to surround an outer surface of the first insulating member, and the first insulating member can be an inorganic substance.

[0028] The inorganic substance can be an inorganic metal oxide.

[0029] The inorganic metal oxide can be one or more selected from the group consisting of aluminum oxide (Al2O3), aluminum nitride (AlN), zirconium oxide (ZrO2), titanium dioxide (TiO2), calcium carbonate (CaCO3), silicon dioxide (SiO2), zinc oxide (ZnO), and cerium oxide (CeO2).

[0030] The first insulating member can be configured in the form of a nano-inorganic oxide dispersion liquid.

[0031] The second insulating member can be ceramified at high temperature.

[0032] The second insulating member can be one or more selected from the group consisting of boron-based, phosphorus-based, and silicon-based flame retardant coating agents.

[0033] The second insulating member may contain one or more components selected from the group consisting of magnesium hydroxide (MDH), monoammonium phosphate (MAP), and aluminum trihydrate (ATH).

[0034] The second insulating member may include one or more materials selected from the group consisting of fire-resistant silicone, fire-resistant plastic, polyphenylene sulfide, polyetheretherketone, polyphthalamide, polyamide, polysulfone, polyethersulfone, polyetherimide, acrylic fiber, and polybenzimidazole.

[0035] The metal plate may be made of an electrically conductive material including copper, aluminum, nickel, gold, silver, or a combination thereof.

[0036] The plurality of insulating members may be in the form of an adhesive tape, a coatable foam, a slurry in which an insulating material is dispersed, a heat-shrinkable tube, insert molding, or an upper case and a lower case joined to each other having a hinge structure or fastening structure.

[0037] Furthermore, the present invention provides a battery pack in which a plurality of battery modules are electrically connected via the busbar.

[0038] In the aforementioned battery pack, the plurality of battery modules are housed in a battery pack housing, a grid-like partition wall is provided inside the battery pack housing, one battery module is located in one grid space, and the busbar is arranged to cross the top of the partition wall so that the plurality of battery modules can be electrically connected.

[0039] Furthermore, the present invention can also be provided in forms that combine various means for solving the above-mentioned problems. [Effects of the Invention]

[0040] As explained above, the busbar according to the present invention can ensure insulation even when the busbar comes into contact with an electrically conductive object in the vicinity during a fire.

[0041] Furthermore, the first insulating material, aluminum oxide, is chemically bonded at high temperatures to the metal plate made of Cu, resulting in a strong bond that provides physical protection for the busbar.

[0042] Furthermore, a portion of the second insulating material swells and becomes ceramic, which helps maintain insulation and airtightness characteristics. [Brief explanation of the drawing]

[0043] [Figure 1] This is a perspective view showing a conventional busbar before and after damage caused by fire. [Figure 2] These are a plan view and a vertical cross-sectional view of the busbar according to the present invention. [Figure 3] This is a vertical cross-sectional view showing a busbar according to the present invention before and after damage caused by fire. [Figure 4] These are perspective and vertical cross-sectional views showing the configuration with busbars connecting two battery modules positioned to pass through a bulkhead. [Figure 5] This is a perspective view of a battery pack in which multiple battery modules are housed in a battery pack housing partitioned by bulkheads. [Modes for carrying out the invention]

[0044] Hereinafter, embodiments that allow a person with ordinary skill in the art to carry out the present invention will be described in detail based on the attached drawings. However, in describing the operating principles of preferred embodiments of the present invention in detail, if it is determined that a specific description of a related known function or configuration may unnecessarily obscure the gist of the present invention, such detailed description will be omitted.

[0045] Furthermore, the same reference numerals shall be used throughout the drawings for parts that have similar functions and operations. Throughout the specification, when it is said that one part is connected to another part, this includes not only direct connections but also indirect connections through other elements in between. Also, when it is said that a component is included, unless otherwise stated, it does not mean that other components are excluded, but rather that other components may be included.

[0046] Furthermore, explanations that limit or add to the constituent elements are applicable to all inventions and are not limited to a specific invention, unless otherwise specified.

[0047] Furthermore, unless otherwise specified, the singular form used throughout the description of this invention and the claims also includes the plural form.

[0048] Furthermore, throughout the description and claims of this invention, "or" includes "and" unless otherwise specified. Therefore, "including A or B" means three cases: including A, including B, or including both A and B.

[0049] The present invention will be described in detail with reference to the drawings, along with the examples provided.

[0050] The busbar according to the present invention is a type of busbar used as an electrical coupling means, and as used herein, the intermodule busbar refers to one used as a means of connecting battery modules arranged in a battery pack, and the term "busbar" can be understood to include the aforementioned "intermodule busbar".

[0051] In one specific example, the length of the busbar can be determined by considering the distance between the battery modules to be connected, and the width and thickness of the busbar can be determined by considering the amount of current and resistance being supplied.

[0052] Furthermore, the busbar shape can be manufactured taking into consideration the position of the battery module connector, and can be a shape bent upward or downward parallel to the entire width of the busbar, an L-shape bent at 90 degrees on a plane, a U-shape bent at 90 degrees on a plane from both ends, and

[0053]

number

[0054] Generally, each end of a busbar is used as a connecting point for linking to an external device, and therefore, it is equipped with a connecting structure, such as fastening holes for bolt fastening.

[0055] Figure 2 shows a plan view and a vertical cross-sectional view of the busbar according to the present invention, with the cross-section along line AA in the plan view at the top of Figure 2 shown as a vertical cross-sectional view at the bottom of Figure 2.

[0056] Referring to Figure 2, the busbar 200 includes a metal plate 210 for electrical connection and a plurality of insulating members provided on the outer surface of the metal plate 210.

[0057] The plurality of insulating members include a first insulating member 220 that surrounds at least a portion of the metal plate 210 and chemically bonds with the metal constituting the metal plate 210 in a high-temperature environment such as flame generation, and a second insulating member 230 that surrounds the outer surface of the first insulating member 220 and ceramicizes at high temperatures.

[0058] A busbar may include connecting structures at both ends for connecting battery modules, and may include a metal bar-shaped metal plate made of an electrically conductive metal material, and a plurality of insulating members provided on the portion of the metal plate excluding both ends, wherein the plurality of insulating members may be configured as a plurality of layered structures.

[0059] The metal constituting the metal plate is copper, aluminum, nickel, gold, silver, or a combination thereof, and the plurality of insulating members may be one or more of plastic, inorganic oxide, and nonconductive metal.

[0060] At both ends of the metal plate 210, the first insulating member 220 and the second insulating member 230 are not provided on the surface, and the metal plate 210 is exposed, forming an electrical connection portion 240.

[0061] The electrical connection portion 240 has a configuration in which one or more connection openings 241 are formed.

[0062] Either of the electrical connection portions 240 formed on both ends of the busbar 200 can be connected to the positive terminal connector of the first battery module, and the other can be connected to the negative terminal connector of the second battery module. Specifically, when bolting work using bolts and nuts is performed to connect to the battery module connectors, the busbar 200 can be connected to the first battery module and the second battery module by inserting a bolt into the opening 241 and then securing it with a nut.

[0063] The temperature at which the first insulating member forms a chemical bond with the metal plate may be between 800°C and 1,500°C. Generally, the ignition temperature when a battery pack is in an abnormal state is 1,000°C or higher, so when the battery pack is in an abnormal state, a chemical bond 221 may be formed between the metal constituting the metal plate, particularly copper, and the substance constituting the first insulating member, particularly aluminum oxide (Al2O3).

[0064] The substance formed by the chemical reaction between Cu, which is the material of the metal plate, and aluminum oxide, which is the material of the first insulating member, may include one or more compounds from CuAlO2 and CuAl2O.

[0065] In other words, a chemical bond is formed between Cu and Al2O3 to create CuAlO2 and / or CuAl2O, and this material formed at the interface between the metal plate and the material of the first insulating member creates a strong bond between the metal plate and the material of the first insulating member, similar to a welded surface. Furthermore, the CuAlO2 and / or CuAl2O physically protect the metal plate from surrounding components, thus eliminating the occurrence of additional abnormal conditions such as short circuits.

[0066] The first insulating member is an inorganic material, and the inorganic material may be an inorganic metal oxide.

[0067] The inorganic metal oxide may be one or more selected from the group consisting of aluminum oxide (Al2O3), aluminum nitride (AlN), zirconium oxide (ZrO2), titanium dioxide (TiO2), calcium carbonate (CaCO3), silicon dioxide (SiO2), zinc oxide (ZnO), and cerium oxide (CeO2).

[0068] The insulating member mentioned above may be a nano-inorganic oxide dispersion applied to the outer surface of the metal plate.

[0069] Such nano-inorganic oxide dispersions may contain one or more selected from the group consisting of chlorinated alkyds, bromide epoxy resins, aluminum hydroxide, chlorinated paraffins, and antimony oxide.

[0070] Furthermore, the nano-inorganic oxide dispersion may be in the form of one or more additives selected from the group consisting of halogens, phosphorus, nitrogen, minerals, and oxides, or in the form of expandable nano-charged materials.

[0071] Since the second insulating member 230 constitutes the outermost surface that comes into direct contact with flames in the event of a fire, it may contain one or more materials selected from the group consisting of fire-resistant silicone, fire-resistant plastic, polyphenylene sulfide, polyetheretherketone, polyphthalamide, polyamide, polysulfone, polyethersulfone, polyetherimide, acrylic fiber, and polybenzimidazole.

[0072] Specifically, the second insulating member 230 may be refractory silicone that ceramicizes when exposed to flames or high-temperature gases.

[0073] The aforementioned refractory silicone exhibits the properties of a normal silicone resin at room temperature, but at high temperatures, it transforms into a ceramic structure and acquires ceramic properties. This phenomenon of the refractory silicone is referred to as ceramicization in this specification. The refractory silicone maintains its shape without deformation at high temperatures. Furthermore, it has high flame resistance, so flames cannot pass through the refractory silicone.

[0074] The second insulating member 230 may be a material that has the property of ceramicizing at high temperatures. For example, if a fire and explosion occur in a battery cell within a battery module and heat is transferred to a busbar connected to the battery module, the second insulating member will ceramicize due to the gas and flame released from the battery cell, but will be able to maintain its shape.

[0075] Therefore, when a silicone tube is conventionally attached to the outer surface of a metal plate, the problem of the silicone tube disappearing and the metal plate being exposed can be prevented.

[0076] On the other hand, the second insulating member may include expandable flame-retardant silicone, which has the property of expanding at high temperatures.

[0077] In other words, when a fire occurs and the environment becomes high temperature, the second insulating member has the property of expanding while ceramicizing from the outside, so when the busbar, which is positioned to penetrate the opening, expands, it can seal the gap in the opening, thereby blocking the propagation of flames and sparks through the gap in the opening.

[0078] Therefore, in the portion of the busbar equipped with the first insulating member and the second insulating member, the metal plate is not exposed to the outside, and since the first insulating member and the second insulating member have high heat resistance properties, the busbar can ensure heat resistance and insulation.

[0079] Depending on the type of material comprising the first or second insulating member, it can be applied in any one of the following forms, and the application methods of the first and second insulating members may differ from one another. For example, it may consist of any one of the following: a tape form that can be attached with an adhesive surface on its inner surface; a coatable foam form; application of a slurry in which insulating material is dispersed; application of a heat-shrinkable tube; insert molding; or joining an upper case and a lower case having a hinge structure or fastening structure to each other.

[0080] Figure 3 is a vertical cross-sectional view showing the busbar according to the present invention before and after damage caused by fire.

[0081] Figure 3 shows the process of damage to a busbar caused by fire in two stages, with the progression from top to bottom showing the progression over time.

[0082] Referring to Figure 3, the upper drawing is a vertical cross-sectional view of the busbar 200 in a normal state where no fire occurred, in which the outer surface of the innermost metal plate 210 is sequentially surrounded by a first insulating member 220, which is an inorganic metal oxide with insulating properties, and a second insulating member 230, which becomes ceramic at high temperatures.

[0083] Referring to the lower diagram of Figure 3, a fire may occur in the battery cell, and the flame or hot gas may be transmitted to the busbar, which may form a chemical bond 221 between the metal plate, which is made of metal, particularly copper, and the first insulating member, which is an inorganic metal oxide.

[0084] The second insulating member may exhibit an expansion characteristic, swelling as it undergoes ceramicization. Therefore, if the busbar is positioned to penetrate the opening, the expansion characteristic of the second insulating member can seal the opening. In this way, if there is a gap in the opening, the gap through which flames and sparks from inside the battery module where a fire has occurred can escape is filled by the expanded second insulating member, thereby preventing the flames and sparks from propagating to adjacent battery modules through the gap.

[0085] The second insulating member may be one or more selected from the group consisting of boron-based, phosphorus-based, and silicon-based flame retardant coating agents.

[0086] The second insulating member may contain one or more of the following components: magnesium hydroxide (MDH), monoammonium phosphate (MAP), and aluminum trihydrate (ATH).

[0087] The insulation performance of the second insulating member can be improved by the components described above.

[0088] Thus, the first insulating member 220 prevents short circuits of the metal plate through chemical bonding 221 with the metal plate, and the second insulating member 230 can be ceramicized at high temperatures to ensure high insulation performance. Therefore, even in the event of a fire and resulting high-temperature environment, the first insulating member 220 and the second insulating member 230, which are located on the outside of the metal plate, can maintain their surrounding state, so the metal plate inside the busbar is not exposed.

[0089] The first insulating member may be formed of aluminum oxide (Al2O3). If a fire occurs due to an abnormal condition of the battery module, the first insulating member will not burn away like organic materials such as plastics used as existing general insulating members, and will be able to maintain the insulating properties of the busbar.

[0090] In a normal state, the battery modules are electrically and physically connected via busbars containing metal plates made of copper (Cu), and insulation from surrounding electrical components can be ensured by multiple insulating members provided on the busbars.

[0091] In the ignition state of the battery module, the internal temperature is above 1,000°C, so the metal plate made of copper and the first insulating member made of aluminum oxide can chemically bond together.

[0092] As a result of the chemical bonding between Cu and Al2O3, the metal plate and the first insulating member are bonded in a state similar to welding. In this way, the first insulating member, firmly bonded to the outer surface of the metal plate, can physically protect the metal plate from surrounding electrical components, eliminating the occurrence of additional abnormal conditions such as short circuits.

[0093] The second insulating member may be made of fire-resistant silicone. If a fire occurs due to an abnormal condition of the battery module, the second insulating member will not burn away like organic materials such as plastics used as existing general insulating members, and will be able to maintain the insulating properties of the busbar.

[0094] In the normal state of the battery module, the second insulating member surrounds the metal plate made of copper and the first insulating member. Since the second insulating member has elastic properties in the normal state, it not only protects the brittle ceramic first insulating member but also reinforces the insulating function by forming an additional insulating layer on the first insulating member.

[0095] In the event of a battery module ignition, the second insulating material containing fire-resistant silicone undergoes a ceramicization phenomenon starting from the parts exposed to the outside. However, depending on the material of the second insulating material, expansion characteristics may also appear along with the ceramicization phenomenon.

[0096] In other words, while conventional busbar insulating members simply cover a metal plate made of Cu, the insulating member of the present invention has a structure in which a first insulating member is added so as to surround the periphery of the metal plate made of Cu, and a second insulating member containing a fire-resistant silicone material surrounds the outermost edge of the busbar to support the metal plate.

[0097] Figure 4 shows a perspective view and a vertical cross-sectional view of a configuration in which a busbar connecting two battery modules is positioned to pass through a bulkhead.

[0098] Referring to Figure 4, a flame-preventing partition wall 330 is formed between the two battery modules 301, and a through-hole 302 is formed in the partition wall through which the busbar 200 passes. The busbar 200 is positioned through the through-hole 302 and electrically connects the two battery modules 301.

[0099] If the second insulating member of the busbar 200 contains expandable flame-retardant silicone, when the temperature of the busbar increases due to a fire, the second insulating member can expand and seal the through-hole 302, thereby preventing flames and sparks from propagating to adjacent battery modules.

[0100] Alternatively, the position and size of the partition can be set to guide the direction in which the flames and sparks generated in the battery module spread.

[0101] Figure 5 is a perspective view of a battery pack in which multiple battery modules are housed in a battery pack housing 310 partitioned by partition walls.

[0102] Referring to Figure 5, the battery pack 300 is configured such that a plurality of battery modules 301 are electrically connected via a busbar 200 according to the present invention. Figure 5 shows a battery pack containing nine battery modules, but this is merely an example for illustrative purposes, and the arrangement and number of battery modules constituting the battery pack, as well as the coupling position and configuration of the busbar used to connect the battery modules, are not limited thereto.

[0103] In the battery pack 300 according to the present invention, the plurality of battery modules are housed in a battery pack housing 310, a grid-like partition wall is provided inside the battery pack housing 310, one battery module is located in one grid space, and the busbar is arranged to cross the upper surface 311 of the partition wall 330 and electrically connects the plurality of battery modules.

[0104] The aforementioned grid-like partition can serve as a flame prevention mechanism, so even if one battery module catches fire, it can prevent the flames and sparks from spreading through adjacent battery modules.

[0105] Furthermore, when the busbar is positioned to cross the upper surface 311 of the bulkhead 330, even if the busbar comes into contact with the components made of electrically conductive metal material that constitute the battery pack on the upper surface 311 of the bulkhead 330, the first insulating member and the second insulating member prevent the metal plate from being exposed to the outside when a fire occurs inside the battery module, thus maintaining an insulating state between the busbar and the components made of electrically conductive metal material.

[0106] Thus, in the event of a fire, the first and second insulating members provided on the metal plate are not destroyed and remain attached to the outer surface of the metal plate, thus preventing the metal plate from being exposed to the outside. Therefore, the insulating state can be maintained even if the busbar is in contact with an adjacent metal part.

[0107] A person with ordinary skill in the field to which this invention belongs will be able to make various applications and modifications within the scope of this invention based on the above content. [Explanation of Symbols]

[0108] 110, 210 metal plates 120 Insulating Tape 130 Silicone Tube 200 bus bar 220 First insulating member 221 Chemical Bonds 230 Second insulating member 240 Electrical connection 241 Aperture 300 Battery Pack 301 Battery Module 302 Through-hole 310 Battery Pack Housing 311 Upper surface of bulkhead 320 Battery Pack Housing 330 Bulkhead

Claims

1. A metal plate and Multiple insulating members provided on the outer surface of the metal plate, Includes, The aforementioned metal plate is made of a material containing copper, At least a portion of the plurality of insulating members forms a chemical bond with the metal plate, The plurality of insulating members are, The metal plate includes a first insulating member and a second insulating member provided so as to surround the outer surface of the first insulating member. The first insulating member is aluminum oxide (Al ２ O ３ ) and the aluminum oxide (Al ２ O ３ ) is a busbar that is added to the metal plate in the form of nanoparticles.

2. The busbar according to claim 1, wherein the second insulating member comprises one or more components selected from the group consisting of magnesium hydroxide (MDH), monoammonium phosphate (MAP), and aluminum trihydrate (ATH; Aluminum Trihydrate), and the second insulating member ceramicizes when the battery module is ignited.

3. The bus bar according to claim 1, wherein the second insulating member comprises one or more selected from the group consisting of fire-resistant silicone, fire-resistant plastic, polyphenylene sulfide, polyetheretherketone, polyphthalamide, polyamide, polysulfone, polyethersulfone, polyetherimide, acrylic fiber, and polybenzimidazole.

4. The bus bar according to claim 1, wherein the plurality of insulating members are configured in any one of the following ways: in the form of adhesive tape, in the form of foam provided for coating, in the form of applying a slurry in which an insulating material is dispersed, in the form of applying heat-shrinkable tubing, in the form of insert molding, or in the form of joining an upper case and a lower case having a hinge structure or fastening structure.

5. A battery pack in which a plurality of battery modules are electrically connected via a busbar as described in any one of claims 1 to 4.

6. The aforementioned multiple battery modules are housed in a battery pack housing. A grid-like partition wall is provided inside the battery pack housing. One battery module is located within one grid space, The battery pack according to claim 5, wherein the busbar is positioned to cross the upper part of the bulkhead and electrically connects the plurality of battery modules.

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