CN118556342A - Bus bar with improved flame retardancy and battery pack including the same - Google Patents

Abstract

The present invention relates to a bus bar comprising: a metal plate; and a plurality of insulating members added to an outer surface of the metal plate, wherein at least some of the plurality of insulating members form a chemical bond with the metal plate. According to the present invention, insulation is maintained even in the event of a fire, thus improving safety.

Description

Bus bar with improved flame retardancy and battery pack including the same

Technical Field

This application claims the benefit of priority to Korean Patent Application No. 2022-0114234 filed on September 8, 2022 and Korean Patent Application No. 2023-0118950 filed on September 7, 2023, the disclosures of which are incorporated herein by reference in their entirety.

The present invention relates to a bus bar with improved flame retardancy, which connects battery modules to each other, and more particularly, to a bus bar configured to add a plurality of insulating members to a metal plate made of a conductive metal material so as to protect the metal plate from external influences, thereby improving flame retardancy, and a battery pack including the bus bar.

Background Art

With the recent development of alternative energy due to air pollution and energy depletion caused by the use of fossil fuels, the demand for secondary batteries that can store the generated electrical energy has increased. Secondary batteries that can be charged and discharged are closely used in daily life. For example, secondary batteries are used in mobile devices, electric vehicles and hybrid electric vehicles.

Due to the increase in the use of mobile devices, the increase in the complexity of mobile devices, and the development of electric vehicles, the required capacity of lithium secondary batteries used as energy sources for various electronic devices inevitably used in modern society has increased. In order to meet the needs of users, a plurality of battery cells are provided in small devices, and a battery module including a plurality of battery cells electrically connected to each other or a battery pack including a plurality of battery modules is used in vehicles, etc.

As the types of devices using lithium secondary batteries as energy sources expand as described above, the application of lithium secondary batteries to devices requiring high capacity and high output is also expanding.

In line with this trend, manufacture and use of battery modules in which a plurality of battery cells are electrically connected to one another and battery packs in which battery modules are connected to one another in series and/or in parallel have increased.

Furthermore, the bus bar is widely used as an electrical connection means between battery modules, and can be used as a large current conducting means because the bus bar can allow a large current to stably flow therethrough even though the bus bar has a relatively small thickness compared to a cable.

Generally, the bus bar may be provided in the form of a metal bar such as copper or aluminum, which exhibits excellent conductivity, and the remaining portion of the metal bar excluding the opposite end connected to the terminal is covered by a tube or an injection-molded product for safety.

Specifically, the bus bar may be used in the form that a metal plate including copper or aluminum exhibiting excellent conductivity is provided inside, and the rest of the outer surface of the metal plate excluding opposite ends for coupling is covered with a tube or an injection molded product to ensure electrical insulation.

In connection with this, FIG. 1 is a perspective view showing a conventional bus bar before and after being damaged by fire.

The bus bar is used to achieve electrical connection between battery modules, and FIG. 1 shows the structure of the bus bar and a state in which the bus bar is damaged due to fire.

1 , the conventional bus bar includes a metal plate 110 made of a conductive material, an insulating tape 120 configured to surround the remaining portion of the outer surface of the metal plate 110 excluding opposite ends thereof, and a silicone tube 130 added to the outer surface of the insulating tape 120 .

Each of the insulating tape 120 and the silicone tube 130 is made of an electrically insulating material, whereby insulation of a configuration other than a device coupled to the opposite ends of the bus bar can be ensured.

When a battery cell in a battery pack catches fire or explodes, the heat energy of the battery cell may be transferred to the battery cell adjacent thereto, thereby causing a fire. When the silicone tube 130 connecting the bus bars of the battery module is damaged by a fire in the battery cell, the insulating tape 120 may be disconnected, whereby the metal plate 110 in the insulating tape may be exposed.

When such exposed metal plates come into contact with conductive battery structures, a short circuit may occur, and such internal short circuit may form an electrically closed circuit in the battery pack, thereby potentially accelerating thermal runaway in the battery pack.

In connection with this, patent document 1 discloses a bus bar comprising a metal rod made of a metal material, an insulating tube configured to cover the remaining portion of the metal rod excluding its opposite end portions, a fireproof belt configured to seal the metal rod into the insulating tube, and a bandage member made of a fire-resistant material, the bandage member being interposed between the insulating tube and the fireproof belt, the bandage member being configured to surround the fireproof belt to be fixed to the metal rod.

In Patent Document 1, even if the insulating tube is burned due to fire, the bandage member can strongly fix the fireproof tape, thereby preventing direct contact between the metal rod and surrounding metal objects, thereby preventing a short circuit.

Patent Document 2 discloses a bus bar including a metal rod made of a metal material, a bandage member configured to surround the remaining portion of the metal rod excluding opposite ends thereof, and an insulating tube configured to surround both the metal rod and the bandage member.

In Patent Document 2, even in the event of a fire, the bandage member provided on the surface of the metal bar remains attached to the surface of the metal bar, whereby the metal bar does not directly contact surrounding metal objects, and thus a short circuit can be prevented.

However, since each of the bus bar of Patent Document 1 and the bus bar of Patent Document 2 further includes a bandage member, the thickness and weight of the bus bar increase.

When a fire occurs in a battery pack, the tube or injection molded product surrounding the metal rod may burn, whereby the metal rod may be exposed to the outside. When the metal rod exposed to the outside comes into contact with surrounding metal objects, a short circuit may occur.

In addition, using only bus bars with fire-resistant heat-resistant insulators cannot actively deal with flames.

Therefore, there is a need for a bus bar that can prevent flames from spreading between battery modules in the event of a fire while preventing metal bars or metal plates provided therein from being exposed even if an insulating material added to an outer surface of the bus bar is burned due to the fire.

(Prior art literature)

(Patent Document 1) Korean Patent Application Publication No. 2021-0050983 (May 10, 2021)

(Patent Document 2) Korean Patent Application Publication No. 2021-0141095 (November 23, 2021)

Summary of the invention

Technical issues

The present invention is made in view of the above problems, and an object of the present invention is to provide a bus bar and a battery pack including the bus bar, wherein the bus bar is configured such that a plurality of insulating members are added to the outer surface of a metal plate made of a conductive metal material so as to protect the metal plate from external influences, thereby improving flame retardancy.

Technical Solution

A bus bar according to the present invention includes: a metal plate; and a plurality of insulating members added to an outer surface of the metal plate, wherein at least some of the plurality of insulating members form a chemical bond with the metal plate.

The plurality of insulating members may include a first insulating member added to the metal plate and a second insulating member added to the first insulating member to surround an outer surface of the first insulating member, wherein the first insulating member may be made of an inorganic material.

The inorganic material may be an inorganic metal oxide.

The inorganic metal oxide may be at least one selected from the group consisting of aluminum oxide _{Al2O3 ,} aluminum nitride AlN, zirconium dioxide _ZrO2 , titanium dioxide _TiO2 , calcium carbonate _CaCO3 , silicon dioxide _SiO2 , zinc oxide ZnO, and cerium dioxide _CeO2 .

The first insulating member may be configured in the form of a nano-inorganic oxide dispersion.

The second insulating member may be ceramicized at a high temperature.

The second insulating member may be made of at least one selected from the group consisting of a boron-based flame retardant coating agent, a phosphorus-based flame retardant coating agent, and a silicon-based flame retardant coating agent.

The second insulating member includes at least one selected from the group consisting of magnesium hydroxide MDH, monoammonium phosphate MAP, and aluminum hydroxide ATH.

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

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

Each of the multiple insulating members can be configured in the form of an attachable tape or a coatable foam, or can be formed by applying a slurry in which an insulating material is dispersed, by adding a heat shrink tube, by insert molding, or by connecting an upper shell and a lower shell each having a hinge structure or a fastening structure.

In addition, the present invention provides a battery pack including a plurality of battery modules electrically connected to each other via a bus bar.

In the battery pack, the plurality of battery modules may be accommodated in a battery pack housing, a grid-like partition wall may be installed in the battery pack housing, one battery module may be located in one grid space, and the bus bar may be arranged to traverse the upper portion of the partition wall so as to electrically connect the plurality of battery modules to each other.

In addition, the present invention can provide various combinations of the above-mentioned solving means.

Beneficial Effects

As is apparent from the above description, according to the present invention, even when the bus bar comes into contact with conductive objects around it in the event of a fire, insulation of the bus bar can be ensured.

In addition, the first insulating member made of alumina forms a chemical bond with the metal plate made of Cu at a high temperature, whereby the first insulating member is firmly bonded to the metal plate, and thus the bus bar can be physically protected.

In addition, part of the second insulating member is ceramicized while expanding, whereby insulating and airtight properties can be maintained.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view showing a conventional bus bar before and after being damaged by fire.

FIG. 2 is a plan view and a vertical cross-sectional view of a bus bar according to the present invention.

FIG. 3 is a vertical cross-sectional view showing a bus bar according to the present invention before and after being damaged by fire.

4 is a perspective view and a vertical sectional view illustrating a state in which a bus bar configured to connect two battery modules to each other is provided to extend through a partition wall.

FIG. 5 is a perspective view of a battery pack in which a plurality of battery modules are accommodated in a battery pack case partitioned by partition walls.

DETAILED DESCRIPTION

Now, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the preferred embodiments of the present invention. However, when describing the operating principle of the preferred embodiments of the present invention in detail, when the detailed description of the known functions and configurations incorporated herein will make the subject matter of the present invention unclear, the detailed description will be omitted.

In addition, the same reference numerals will be used throughout the drawings to represent components that perform similar functions or operations. Where a component is connected to another component throughout the specification, not only may the component be directly connected to the other component, but the component may also be indirectly connected to the other component via other components. In addition, unless otherwise specified, the inclusion of a particular element does not mean the exclusion of other elements, but rather means that such elements may also be included.

In addition, unless otherwise specifically limited, the description of implementing elements by limitation or addition can be applied to all the inventions, and does not specifically limit the invention.

In addition, in the description of the present invention and the claims of this application, unless otherwise mentioned, the singular form is intended to include the plural form.

In addition, in the description of the present invention and the claims of the present application, unless otherwise mentioned, "or" includes "and." Therefore, "including A or B" means three cases, namely, the case including A, the case including B, and the case including A and B.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The busbar according to the present invention is a busbar used as an electrical connection device, and the inter-module busbar used in this specification refers to a busbar used as a device configured to interconnect battery modules arranged in a battery pack, and the term "busbar" can be understood to include the term "inter-module busbar".

In a specific example, the length of the bus bar may be set in consideration of the distance between battery modules to be connected, and the width and thickness of the bus bar may be set in consideration of the amount of current flowing through the bus bar and the resistance of the bus bar.

In addition, the shape of the bus bar can be configured considering the position of the connector of the battery module, and the bus bar can be formed to have any of a variety of shapes, such as a shape in which the bus bar is bent upward or downward to be parallel to its total width, an L-shape in which the bus bar is bent 90 degrees in a plane, or a [-shape or └┓-shape in which the bus bar is bent 90 degrees at its opposite ends in a plane.

Since each of the opposite end portions of the bus bar is often used as a connection portion coupled to an external device, a structure for connection such as a fastening hole for bolt fastening is provided.

2 is a plan view and a vertical sectional view of a bus bar according to the present invention, wherein a section taken along A-A in the plan view in the upper portion of FIG. 2 is shown as a vertical sectional view in the lower portion of FIG. 2 .

2 , the bus bar 200 includes a metal plate 210 for electrical connection and a plurality of insulating members added to an outer surface of the metal plate 210 .

The plurality of insulating members include: a first insulating member 220 configured to surround at least a portion of the metal plate 210, the first insulating member forming a chemical bond with a metal constituting the metal plate 210 in a high temperature environment such as flame generation; and a second insulating member 230 added to the first insulating member 220 to surround an outer surface thereof, the second insulating member being configured to be ceramicized at a high temperature.

The bus bar may include a connecting structure formed at each of its opposite ends so as to connect the battery modules, and the bus bar may be configured to have the following structure: a metal plate formed in the shape of a metal rod made of a conductive metal material is provided, and a plurality of insulating members are added to a portion of the metal plate excluding the opposite ends, wherein the plurality of insulating members are provided to have a plurality of layered structures.

The metal constituting the metal plate may be copper, aluminum, nickel, gold, silver, or a combination thereof, and each of the plurality of insulating members may be made of at least one of plastic, inorganic oxide, and non-conductive metal.

The first insulating member 220 and the second insulating member 230 are not added to the surfaces of the opposite ends of the metal plate 210 , and the ends of the metal plate 210 are exposed to constitute the electrical connection portion 240 .

At least one opening 241 for connection is formed in each of the electrical connection portions 240 .

One of the electrical connection portions 240 formed at opposite ends of the bus bar 200 may be connected to the positive connector of the first battery module, and the other may be connected to the negative connector of the second battery module. Specifically, when a bolting operation is performed using bolts and nuts so that the bus bar is connected to the connectors of the battery modules, the bolts may be inserted into the openings 241 and the nuts may be fastened to the bolts, whereby the bus bar 200 may be connected to the first battery module and the second battery module.

The temperature at which the first insulating member forms a chemical bond with the metal plate may be 800° C. to 1500° C. Generally, the ignition temperature of the battery pack when it is in an abnormal state is 1000° C. or higher. Therefore, 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 material constituting the first insulating member (particularly, aluminum oxide (Al ₂ O ₃ )).

The material formed by a chemical reaction between Cu as the material of the metal plate and aluminum oxide as the material of the first insulating member may include at least one of CuAlO ₂ and CuAl ₂ O.

That is, chemical bonding between Cu and _Al2O3 can occur to form _CuAlO2 and/or _CuAl2O , wherein a _strong bond similar to welding is formed between the metal plate and the first insulating member by the material formed at the interface between the metal plate and the first insulating member. In addition, due to _CuAlO2 and/or _CuAl2O , the metal plate can be physically protected from the influence of surrounding components, thereby eliminating the occurrence of other abnormal phenomena such as short circuits.

The first insulating member may be made of an inorganic material, wherein the inorganic material may be an inorganic metal oxide.

The inorganic metal oxide may include at least _one selected from the group consisting of aluminum oxide ( _Al2O3 ), aluminum nitride ( _AlN ), zirconium dioxide (ZrO2), titanium dioxide ( _TiO2 ), calcium carbonate ( _CaCO3 ), silicon dioxide ( _SiO2 ), zinc oxide (ZnO), and cerium dioxide ( _CeO2 ).

The first insulating member may be a nano-inorganic oxide dispersion applied to the outer surface of the metal plate.

The nano inorganic oxide dispersion may include at least one selected from the group consisting of chlorinated alkyd, brominated epoxy, aluminum hydroxide, chlorinated paraffin, and antimony oxide.

In addition, the nano inorganic oxide dispersion may be in the form of at least one additive selected from the group consisting of halogen, phosphorus, nitrogen, minerals and oxides, or in the form of an expandable nano filler.

Since the second insulating member 230 constitutes the outermost surface with which the flame directly contacts in the event of a fire, the second insulating member may include at least one selected from the group consisting of fire-resistant silicone, fire-resistant plastic, polyphenylene sulfide, polyetheretherketone, polyphthalamide, polyamide, polysulfone, polyethersulfone, polyetherimide, acrylic fiber and polybenzimidazole.

Specifically, the second insulation member 230 may be made of a fire-resistant silicone resin that is ceramized when exposed to flame or high-temperature gas.

Refractory silicone resin shows the performance of general silicone resin at room temperature, but at high temperature, the structure of refractory silicone resin becomes a ceramic structure, so that refractory silicone resin has ceramic properties. This phenomenon of refractory silicone resin is referred to as ceramicization in this specification. Refractory silicone resin keeps its shape unchanged at high temperature. In addition, refractory silicone resin has high flame retardancy, so flames will not pass through refractory silicone resin.

The second insulating member 230 may be made of a material that is ceramicized at high temperatures. For example, when a battery cell in a battery module catches fire and explodes and heat is transferred to a bus bar coupled to the battery module, the second insulating member may be ceramicized by gas or flame released from the battery cell, but the shape of the second insulating member may be maintained.

Therefore, it is possible to prevent a conventional problem in which, when a silicone tube is added to the outer surface of a metal plate, the silicone tube is burned and thereby the metal plate is exposed.

Furthermore, the second insulating member may include expandable flame-retardant silicone that is expandable at high temperatures.

That is, when a high temperature environment is formed due to a fire, the second insulating member expands while being ceramicized from the outside thereof. When the bus bar arranged to extend through the opening expands, the gap in the opening can be blocked, thereby preventing flames or sparks from spreading through the gap in the opening.

Therefore, the metal plate is not exposed to the outside at the portion of the bus bar to which the first and second insulating members are added, and the heat resistance and insulation of the bus bar can be ensured by utilizing the high heat resistance of the first and second insulating members.

Depending on the type of material constituting the first insulating member or the second insulating member, any of the following methods may be used to add the first insulating member or the second insulating member, and the method of adding the first insulating member and the method of adding the second insulating member may be different from each other. For example, the first insulating member or the second insulating member may be configured in the form of an attachable tape having an adhesive surface on the inner surface or in the form of a foam that can be coated, or may be formed by applying a slurry in which an insulating material is dispersed, by adding a heat shrink tube, by insert molding, or by coupling between an upper shell and a lower shell each having a hinge structure or a fastening structure.

FIG. 3 is a vertical cross-sectional view showing a bus bar according to the present invention before and after being damaged by fire.

FIG. 3 shows two steps in the process of a busbar being damaged by fire, wherein time proceeds from top to bottom.

3 , which is a vertical cross-sectional view of a normal busbar 200 where no fire occurs, the outer surface of the innermost metal plate 210 is sequentially surrounded by a first insulating member 220 made of an inorganic metal oxide having insulating properties and a second insulating member 230 ceramicized at high temperature.

3 , when a fire occurs in a battery cell, flames or high-temperature gases may be transferred to the bus bar, thereby forming chemical bonds 221 between a metal (particularly, a metal plate made of copper) and a first insulating member made of an inorganic metal oxide.

The second insulating member may exhibit an expansion property in which the second insulating member expands as ceramicization proceeds. Therefore, when the bus bar is arranged to extend through the opening, the opening may be blocked due to the expansion property of the second insulating member. If there is a gap in the opening, the flame or spark in the battery module where a fire occurs may be discharged through the gap, and the gap may be filled by the expanded second insulating member, thereby preventing the flame or spark from spreading through the gap to the adjacent battery module.

The second insulating member may be made of at least one selected from the group consisting of a boron-based flame retardant coating agent, a phosphorus-based flame retardant coating agent, and a silicon-based flame retardant coating agent.

The second insulating member may include at least one of magnesium hydroxide (MDH), monoammonium phosphate (MAP), and aluminum hydroxide (ATH).

The insulating performance of the second insulating member can be improved by the above-mentioned components.

As described above, the first insulating member 220 prevents the metal plate from short-circuiting by chemical bonds 221 with the metal plate, and the second insulating member 230 is ceramicized at a high temperature to ensure high insulation. Therefore, even if a high temperature environment is formed due to a fire, the first insulating member 220 and the second insulating member 230 added to the outside of the metal plate can be kept to surround the metal plate, so that the metal plate in the bus bar is not exposed.

The first insulating member may be made of aluminum oxide (Al ₂ O ₃ ). When a fire occurs due to abnormality of the battery module, the first insulating member is not burned unlike organic materials such as plastic used as an existing general insulating member, thereby maintaining the insulating performance of the bus bar.

In a normal state of the battery module, electrical and physical connections between the battery modules are formed using a bus bar including a metal plate made of copper (Cu), and insulation of the bus bar from surrounding electrical components may be ensured by a plurality of insulating members added to the bus bar.

In a state where the battery module is on fire, the internal temperature is 1,000° C. or higher, and thus, a chemical bond may be formed between the metal plate made of copper and the first insulating member made of aluminum oxide.

Due to the chemical bond between _Cu and _Al2O3 , the metal plate and the first insulating member are bonded to each other, similar to welding. As described above, by the first insulating member firmly bonded to the outer surface of the metal plate, the metal plate is physically protected from the influence of surrounding electrical components, thereby eliminating the occurrence of other abnormal phenomena such as short circuits.

The second insulating member may be made of fire-resistant silicone resin. When a fire occurs due to abnormality of the battery module, the second insulating member is not burned unlike organic materials such as plastic used as conventional general insulating members, thereby maintaining the insulating performance of the bus bar.

In a normal state of the battery module, the second insulating member keeps surrounding the first insulating member and the metal plate made of copper. The second insulating member has elastic properties under normal conditions, whereby the second insulating member protects the fragile first insulating member (e.g., ceramic). In addition, in order to improve the insulation function, an additional insulating layer may be formed in the first insulating member.

In a state where the battery module is on fire, the second insulating member including the fire-resistant silicone resin is ceramicized from a portion exposed to the outside. However, depending on the material of the second insulating member, the second insulating member may expand while being ceramicized.

That is, whereas a conventional busbar insulating member simply covers a metal plate made of Cu, the insulating member according to the present invention is configured to have the following structure: a first insulating member is added to the periphery of the metal plate made of Cu to surround the metal plate, and a second insulating member comprising a refractory silicone material supports the metal plate while surrounding the outermost side of the busbar.

4 is a perspective view and a vertical sectional view illustrating a state in which a bus bar configured to connect two battery modules to each other is provided to extend through a partition wall.

4, a partition wall 330 for flame prevention is formed between two battery modules 301, and a through hole 302 through which a bus bar 200 extends is formed in the partition wall. The bus bar 200 is provided to extend through the through hole 302 to electrically connect the two battery modules 301 to each other.

When the second insulating member of the bus bar 200 includes expandable flame-retardant silicone, if the temperature of the bus bar increases due to fire, the second insulating member may expand and block the through-hole 302 , thereby preventing flames and sparks from spreading to adjacent battery modules.

Alternatively, the position and size of the partition wall may be set so as to guide the spreading direction of flames and sparks generated in the battery module.

FIG. 5 is a perspective view of a battery pack in which a plurality of battery modules are accommodated in a battery pack case partitioned by partition walls.

5 , according to the present invention, a battery pack 300 is configured such that a plurality of battery modules 301 are electrically connected to each other via a bus bar 200. Although FIG. 5 shows a battery pack including nine battery modules (this is just an example for illustrative purposes), the arrangement and number of battery modules constituting the battery pack and the coupling position and shape of the bus bar for connecting the battery modules to each other are not limited thereto.

In the battery pack 300 according to the present invention, a plurality of battery modules are accommodated in a battery pack housing, a grid-like partition wall is installed in the battery pack housing, one battery module is located in one grid space, and a bus bar is arranged to span an upper surface 311 of the partition wall 330 so as to electrically connect the plurality of battery modules to each other.

The grid-like partition walls can perform a flame prevention function. Therefore, even if a fire occurs in any one battery module, it is possible to prevent the flame or spark from spreading to the battery modules adjacent thereto.

In addition, when the bus bar is provided across the upper surface 311 of the partition wall 330, in the event of a fire in the battery module, the metal plate is not exposed to the outside through the first insulating member and the second insulating member. Therefore, even if the bus bar contacts a component that constitutes the battery pack and is made of a conductive metal material at the upper surface 311 of the partition wall 330, insulation between the bus bar and the component made of the conductive metal material can be maintained.

In the present invention, as described above, the first insulating member and the second insulating member added to the metal plate are not burned and are still added to the outer surface of the metal plate in the event of a fire, so that the metal plate is not exposed to the outside. Therefore, even if the bus bar contacts the metal parts adjacent thereto, the insulation of the bus bar can be maintained.

Those skilled in the art to which the present invention pertains will appreciate that various applications and modifications are possible within the category of the present invention based on the above description.

(Description of Reference Numerals)

110, 210: Metal plate

120: Insulation tape

130: Silicone tube

200: Busbar

220: First insulating member

221: Chemical Bonds

230: Second insulating member

240: Electrical connection part

241: Opening

300: Battery Pack

301: Battery module

302: Through hole

310: Battery Pack Frame

311: Upper surface of battery pack frame

320: Battery pack housing

330: Partition wall

Claims (13)

1. A bus bar, comprising: Metal sheets; and a plurality of insulating members added to an outer surface of the metal plate, Wherein, at least some of the plurality of insulating members form chemical bonds with the metal plate. 2. The bus bar according to claim 1, wherein: The plurality of insulating members include a first insulating member added to the metal plate and a second insulating member added to the first insulating member to surround an outer surface of the first insulating member, and The first insulating member is made of an inorganic material. The bus bar according to claim 2 , wherein the inorganic material is an inorganic metal oxide. The bus bar according to claim 3, wherein the inorganic metal oxide is at least one selected from the group consisting of _aluminum oxide _Al2O3 , aluminum nitride AlN, zirconium dioxide _ZrO2 , titanium dioxide _TiO2 , calcium carbonate _CaCO3 , silicon dioxide _SiO2 , zinc oxide ZnO, and cerium dioxide _CeO2 . 5 . The bus bar according to claim 2 , wherein the first insulating member is configured in the form of a nano inorganic oxide dispersion. The bus bar according to claim 2 , wherein the second insulating member is ceramicized at a high temperature. 7 . The bus bar according to claim 6 , wherein the second insulating member is made of at least one selected from the group consisting of a boron-based flame retardant coating agent, a phosphorus-based flame retardant coating agent, and a silicon-based flame retardant coating agent. 8 . The bus bar of claim 2 , wherein the second insulating member includes at least one selected from the group consisting of magnesium hydroxide (MDH), monoammonium phosphate (MAP), and aluminum hydroxide (ATH). 9. The bus bar of claim 2, wherein the second insulating member comprises at least one selected from the group consisting of fire-resistant silicone, fire-resistant plastic, polyphenylene sulfide, polyetheretherketone, polyphthalamide, polyamide, polysulfone, polyethersulfone, polyetherimide, acrylic fiber, and polybenzimidazole. 10 . The bus bar of claim 1 , wherein the metal plate is made of a conductive material including copper, aluminum, nickel, gold, silver, or a combination thereof. 11. The bus bar according to claim 1, wherein each of the plurality of insulating members is configured in the form of an attachable tape or a form of a foam that can be coated, or is formed by applying a slurry in which an insulating material is dispersed, by adding a heat shrink tube, by insert molding, or by coupling between an upper shell and a lower shell each having a hinge structure or a fastening structure. 12 . A battery pack comprising a plurality of battery modules electrically connected to one another via the bus bar according to claim 1 . 13. The battery pack according to claim 12, wherein: The plurality of battery modules are housed in a battery pack housing, A grid-shaped partition wall is installed in the battery pack housing. A battery module is located in a grid space, and The bus bar is disposed across an upper portion of the partition wall to electrically connect the plurality of battery modules to each other.