Bus bar assembly and battery pack including the same

Abstract

A busbar assembly according to an embodiment of the present invention includes a busbar for guiding electrical connection inside a battery pack; a glass fiber layer containing glass fiber and wrapping the busbar; and a refractory silicone layer filling the space of the glass fiber layer and wrapping the busbar.

Description

Technical Field

[0001] [Cross - Reference to Related Applications] This application claims the benefit of priority based on Korean Patent Application No. 10 - 2023 - 0011438, filed on January 30, 2023, and all the contents disclosed in the literature of the Korean patent application are incorporated herein by reference in their entirety.

[0002] The present invention relates to a busbar assembly and a battery pack including the same, and more particularly, to a busbar assembly with improved fire resistance and a battery pack including the same.

Background Art

[0003] In modern society, the use of portable devices such as mobile phones, notebook computers, video cameras, and digital cameras has become common, and the development of technologies in the fields related to such mobile devices has been active. In addition, rechargeable secondary batteries are used as power sources for electric vehicles (EVs), hybrid electric vehicles (HEVs), plug - in hybrid electric vehicles (P - HEVs), etc. as a solution to problems such as air pollution caused by existing gasoline vehicles that use fossil fuels, and the need for the development of secondary batteries is increasing.

[0004] Currently, commercially available secondary batteries include nickel - cadmium batteries, nickel - metal hydride batteries, nickel - zinc batteries, lithium secondary batteries, etc. Among these, lithium secondary batteries have attracted attention for their advantages such as almost no memory effect compared to nickel - based secondary batteries, free charging and discharging, very low self - discharge rate, and high energy density.

[0005] Such lithium secondary batteries mainly use lithium - based oxides and carbon materials as the positive electrode active material and the negative electrode active material, respectively. A lithium secondary battery includes an electrode assembly in which a positive electrode plate and a negative electrode plate, each coated with such a positive electrode active material and a negative electrode active material, are disposed with a separator therebetween, and a battery case for hermetically storing the electrode assembly together with an electrolyte.

[0006] Generally, lithium secondary batteries can be classified into can-type secondary batteries in which the electrode assembly is installed in a metal can and pouch-type secondary batteries in which the electrode assembly is installed in a pouch made of an aluminum laminate sheet according to the shape of the exterior material.

[0007] In the case of secondary batteries used in small devices, 2-3 battery cells are arranged. However, in the case of secondary batteries used in medium and large devices such as automobiles, a battery module in which a large number of battery cells are electrically connected is used. In such a battery module, a large number of battery cells are connected in series or in parallel with each other to form a battery cell stack, thereby improving the capacity and output. In addition, one or more battery modules can be mounted together with various control and protection systems such as a BDU (Battery Disconnect Unit), a BMS (Battery Management System), and a cooling system to form a battery pack.

[0008] In a battery pack in which a large number of battery modules are gathered, the heat discharged from a large number of battery cells may gather in a narrow space, and the temperature may rise rapidly. That is, in the case of a battery module in which a large number of battery cells are stacked and a battery pack in which such a battery module is mounted, although a high output can be obtained, there is a high possibility that the heat dissipation of the battery cells is not properly performed. In addition, when a thermal runaway phenomenon of the battery cells occurs, there is also a high possibility of explosion and ignition.

[0009] On the other hand, a bus bar connected to the battery module is provided inside the battery pack. FIG. 1 is a plan view showing a conventional bus bar, and FIG. 2 is a cross-sectional view showing a cross-section cut along the cutting line A-A' of FIG. 1.

[0010] Referring to FIGS. 1 and 2, a conventional bus bar 20 is a rod-shaped metal member extending along the length direction, and through holes for connection with the terminal bus bar of the battery module can be formed at both ends of the bus bar 20. Such a bus bar 20 is configured to undertake HV (High voltage) connection in the battery pack. The HV connection means the connection serving as a power source for supplying power, and the bus bar 20 is configured to lead the electrical connection of the battery module and generally includes a metal material with excellent electrical conductivity. As an example, the bus bar 20 can include a copper (Cu) material.

[0011] The covering member 20C can wrap such a bus bar 20. The covering member 20C can include a material having electrical insulation properties, and as an example, can include a silicon material or an epoxy material. Since the covering member 20C wraps the bus bar 20 through which a high current flows, it is possible to prevent the bus bar 20 from coming into contact with other electrical components or conductive members other than the terminal bus bar of the battery module and causing a short circuit.

[0012] Recently, for battery packs, there has been a demand for equipment that does not allow flames to jet out to the outside of the battery pack even if ignition occurs inside the battery pack. Since the flame generated inside the battery pack has a very high temperature of about 1000 °C, the covering member 20C wrapping the bus bar 20 may melt and the bus bar 20 may be exposed. When the exposed bus bar 20 comes into contact with other electrical components or conductive members and a short circuit occurs, the internal flame may further spread, and such a flame may be propagated to the outside of the battery pack. Ultimately, this may lead to the explosion of the battery pack or the vehicle on which the battery pack is mounted.

[0013] Therefore, there is a demand for the development of a technology for a bus bar assembly that can maintain electrical insulation even if a flame occurs inside the battery pack.

Summary of the Invention

Problems to be Solved by the Invention

[0014] The problem to be solved by the present invention is to provide a bus bar assembly that can maintain electrical insulation without melting even if a flame occurs inside the battery pack, and a battery pack including the same.

[0015] However, the problem to be solved by the embodiments of the present invention is not limited to the above-described problems, and can be variously extended within the scope of the technical idea included in the present invention.

Means for Solving the Problem

[0016] A bus bar assembly according to an embodiment of the present invention includes: a bus bar for guiding electrical connection inside a battery pack; a glass fiber layer including glass fibers and wrapping the bus bar; and a refractory silicone layer filling the space of the glass fiber layer and wrapping the bus bar.

[0017] The refractory silicone layer may be in a form in which a refractory silicone material is injection-molded onto the bus bar wrapped by the glass fiber layer.

[0018] The glass fiber layer may be a fabric in a form in which the glass fibers are woven.

[0019] The refractory silicone layer can fill the space between the woven glass fibers.

[0020] The glass fiber layer may include an inner glass fiber layer wrapping the bus bar and an outer glass fiber layer wrapping the bus bar outside the inner glass fiber layer.

[0021] Each of the inner glass fiber layer and the outer glass fiber layer may be a fabric in a form in which the glass fibers are woven.

[0022] The refractory silicone layer can fill the space between the woven glass fibers inside each of the inner glass fiber layer and the outer glass fiber layer.

[0023] The refractory silicone layer can fill the space between the inner glass fiber layer and the outer glass fiber layer.

[0024] The refractory silicone layer can include a silicon material that is ceramized at high heat.

[0025] A battery pack according to an embodiment of the present invention includes at least one of the busbar assemblies; a battery module; a BDU (battery disconnect unit) module for controlling the electrical connection of the battery module; and a BMS (Battery Management System) module for monitoring and controlling the operation of the battery module. At least one of the busbar assemblies electrically connects at least one of between the battery modules, between the battery module and the BDU module, between the battery module and the BMS module, or between the BDU module and the BMS module.

Advantages of the Invention

[0026] According to an embodiment of the present invention, a refractory silicone layer that is ceramized by high heat or flame and a glass fiber layer that complements the structural rigidity of the refractory silicone layer are provided in the busbar assembly, and the electrical insulation of the busbar assembly can be maintained even in a situation of high heat or flame.

[0027] The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

Brief Description of the Drawings

[0028]

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BEST MODE FOR CARRYING OUT THE INVENTION

[0029] Hereinafter, with reference to the accompanying drawings, various embodiments of the present invention will be described in detail so that those having ordinary knowledge in the technical field to which the present invention pertains can easily implement them. The present invention can be implemented in various different forms and is not limited to the embodiments described here.

[0030] In order to clearly explain the present invention, parts not related to the explanation are omitted, and the same reference numerals are given to the same or similar components throughout the specification.

[0031] In addition, the sizes and thicknesses of the respective components shown in the drawings are arbitrarily shown for convenience of explanation, and thus the present invention is not necessarily limited to what is shown in the drawings. In the drawings, the thicknesses are enlarged to clearly show a plurality of layers and regions. Also, in the drawings, for convenience of explanation, the thicknesses of some layers and regions are exaggeratedly shown.

[0032] In addition, when a part such as a layer, film, region, plate, etc. is "on" or "above" another part, this includes not only the case where it is directly above the other part, but also the case where there are other parts in between. Conversely, when a part is said to be "directly above" another part, it means that there are no other parts in the middle. Also, being "on" or "above" a reference part means being located above or below the reference part, and does not necessarily mean being located "on" or "above" in the direction opposite to gravity.

[0033] In addition, throughout the specification, when a part "includes" a certain component, it means that, unless otherwise stated to the contrary, it does not exclude other components, but can further include other components.

[0034] Also, throughout the specification, "in a plane" means when the target part is viewed from above, and "in a cross-section" means when the cross-section obtained by vertically cutting the target part is viewed from the side.

[0035] FIG. 3 is a plan view showing a battery pack according to an embodiment of the present invention.

[0036] Referring to FIG. 3, a battery pack 1000 according to an embodiment of the present invention includes a busbar assembly 100; a battery module 1200; a BDU (battery disconnect unit) module 1300 for controlling the electrical connection of the battery module 1200; and a BMS (Battery Management System) module 1400 for monitoring and controlling the operation of the battery module 1200. At least one busbar assembly 100 according to this embodiment electrically connects at least one of between the battery modules 1200, between the battery module 1200 and the BDU module 1300, between the battery module 1200 and the BMS module 1400, or between the BDU module 1300 and the BMS module 1400. Specifically, a plurality of battery modules 1200 can be housed in the pack frame 1100, and the electrical connection between the battery modules 1200 and the electrical connection between the battery module 1200 and the BDU module 1300 can be performed by the busbar assembly 100. That is, the busbar assembly 100 according to this embodiment can be responsible for HV (High voltage) connection. Here, the HV connection is a connection serving as a power source for supplying power that requires a high voltage, and means a connection between battery cells or between battery modules.

[0037] On the other hand, the BDU module 1300 is a member for controlling the electrical connection of the battery module 1200 and can cut off power between the power conversion device and the battery module 1200. When a condition where the current exceeds the set range occurs, the BDU module 1300 can cut off the power of the battery pack 1000 to ensure the safety of the battery pack 1000.

[0038] On the one hand, the LV connection member 100' according to this embodiment can be responsible for the electrical connection between the battery module 1200 and the BMS module 1400. The electrical connection here is an LV (Low voltage) connection, which means a sensing connection for sensing and controlling the voltage and temperature of the battery module 1200. Specifically, sensors inside the battery module 1200 are arranged, and the real-time temperature information and voltage information of the battery module 1200 are transmitted to the BMS module 1400 through the LV connection member 100'. The real-time operating state of the battery module 1200 can be monitored and controlled through the BMS module 1400. Although not specifically illustrated, an HV current sensor may be integrated into the BMS module 1400. In this case, the busbar assembly according to this embodiment can be responsible for the electrical connection between the battery module 1200 and the BMS module 1400 or between the BDU module 1300 and the BMS module 1400.

[0039] Hereinafter, with reference to FIGS. 4 and 5, the battery module 1200 according to this embodiment will be described. However, the battery module 1200 described below is an exemplary structure of a battery module including a plurality of battery cells 11, and various forms of battery modules including a plurality of battery cells can be applied.

[0040] FIG. 4 is a perspective view showing one of the battery modules included in the battery pack of FIG. 3. FIG. 5 is a partial perspective view showing the state where the module frame and the end plate are removed from the battery module of FIG. 4.

[0041] Referring to FIGS. 4 and 5, the battery module 1200 according to this embodiment can include a battery cell stack 11A in which a plurality of battery cells 11 are stacked. The battery cell stack 11A is shown in FIG. 5. Such a battery cell stack 11A can be housed in the module frame 30 and the end plate 40.

[0042] The battery cell 11 may be a pouch-type battery cell. Such a pouch-type battery cell can be formed by housing an electrode assembly in a pouch case of a laminate sheet including a resin layer and a metal layer, and then fusing the outer peripheral portion of the pouch case. Such a battery cell 11 can be formed in a rectangular sheet structure. The electrode lead 11L connected to the electrode assembly protrudes outside the pouch case, and the electrode leads 11L of the respective battery cells 11 can be electrically connected to each other via a lead bus bar 21. On the other hand, at least one electrode lead 11L can be connected to a terminal bus bar 22. A part of the terminal bus bar 22 can be exposed outside the battery module 1200 as shown in FIG. 4. The lead bus bar 21 and the terminal bus bar 22 can all contain a metal material excellent in electrical conductivity.

[0043] The bus bar assembly 100 according to the present embodiment is electrically connected to such a terminal bus bar 22, and the above-described HV connection can be performed. That is, the battery module 1200 can be electrically connected to another battery module 1200, a BDU module 1300, or a BMS module 1400 via the bus bar assembly 100 connected to the terminal bus bar 22.

[0044] As described above, the battery cells and the battery module described with reference to FIGS. 4 and 5 are exemplary structures, and there are no particular restrictions on the types and forms of the battery cells and the battery module included in the battery pack to which the bus bar assembly according to the present embodiment is applied. That is, although the pouch-type battery cell has been exemplarily described, a prismatic battery cell or a cylindrical battery cell can also be applied to the battery module according to the embodiment of the present invention. Further, although a battery module in which battery cells are housed in a module frame has been described as an example, a CTP (cell to pack) type battery module in which a large number of battery cells are mounted on the battery pack without being housed in the module frame can also be applied as an example of the present invention.

[0045] Hereinafter, with reference to FIGS. 6 to 8, a bus bar assembly according to an embodiment of the present invention will be described in detail.

[0046] FIG. 6 is a plan view showing a bus bar and a glass fiber layer included in a bus bar assembly according to an embodiment of the present invention.

[0047] Referring to FIG. 6, a bus bar assembly 100 according to an embodiment of the present invention includes a bus bar 200 for guiding electrical connection inside a battery pack 1000; and a glass fiber layer 400 including glass fiber 400W and wrapping the bus bar 200.

[0048] The bus bar 200 is configured to guide the electrical connection of the battery module, that is, the HV connection, and can include a metal material excellent in electrical conductivity. As an example, the bus bar 200 can include a copper (Cu) material. The bus bar 200 may be a metal bar extending along the length direction (Ld).

[0049] The glass fiber layer 400 may be a fabric in a form where the glass fiber 400W is woven. As an example, a large number of glass fibers 400W are twisted to form glass fiber strands 400S, and such glass fiber strands 400S can be woven to provide a glass fiber layer 400 in a fabric form. There is no special limitation on the weaving method, and various weaving methods such as plain weave, twill weave, and satin weave can be applied. Such a glass fiber layer 400 can wrap the outer peripheral surface of the bus bar 200 except for a partial region at both ends of the bus bar 200 connected to the terminal bus bar 22 (see FIG. 5). Since the glass fiber layer 400 is a fabric, a space (S) can be formed between the glass fiber strands 400S intersecting in the glass fiber layer 400, and a predetermined space can also be formed between the glass fiber layer 400 and the bus bar 200. Also, a space can be formed between the glass fibers 400W that are twisted while being twisted inside the glass fiber strand 400S itself.

[0050] FIG. 7 is a plan view showing a state in which the bus bar assembly of FIG. 6 is provided with a fire-resistant silicone layer. FIG. 8 is a cross-sectional view showing a cross-section cut along the cutting line B-B' of FIG. 7.

[0051] Referring to FIGS. 6 to 8 together, the bus bar assembly 100 according to the present embodiment further includes a fire-resistant silicone layer 300 that fills the space (S) of the glass fiber layer 400 and wraps the bus bar 200. As shown in FIG. 6, with the bus bar 200 wrapped by the glass fiber layer 400, a fire-resistant silicone material can be injection-molded on the outer peripheral surface of the bus bar 200 to provide the fire-resistant silicone layer 300. That is, the fire-resistant silicone layer 300 according to the present embodiment can be in a form in which the fire-resistant silicone material is injection-molded on the bus bar 200 wrapped by the glass fiber layer 400. Thereby, the glass fibers 400W of the glass fiber layer 400 can be located inside the fire-resistant silicone layer 300. FIG. 8 shows the state of the woven glass fiber strands 400S, which is an example of the present invention. For the glass fiber layer 400 in the present invention, as long as the glass fiber layer 400 is a fabric in which the glass fibers 400W are woven, there are no special restrictions on the form of the woven glass fibers and the weaving method.

[0052] The fire-resistant silicone layer 300 can wrap the outer peripheral surface of the bus bar 200 except for a partial region at both ends of the bus bar 200 connected to the terminal bus bar 22 (see FIG. 5). The fire-resistant silicone layer 300 having electrical insulation functions as an insulating layer for protecting the bus bar 200 and prevents the bus bar 200 from coming into contact with other electrical components or conductive members and causing a short circuit.

[0053] Unlike general silicon materials that are exposed to flames or burn at high temperatures, the refractory silicon material is a material that is exposed to flames or ceramified at high temperatures. The refractory silicon material may be a silicon material that is ceramified when the temperature reaches a certain level or higher. The refractory silicon material may include a silicon polymer and silica. The applied silicon polymer is a functional group and can be a polysiloxane-based compound having a vinyl group, corresponding to the base material of the refractory silicon material. Silica is a reinforcing filler contained in the silicon polymer and may be fumed silica. High-purity silicon chloride (SiCl4) compounds can be produced using metallic silicon as the main raw material through reactions with hydrochloric acid and purification processes, and fumed silica can be obtained by reacting this with hydrogen and oxygen in a high-temperature flame. Further, the refractory silicon material can contain platinum (Pt) as a catalyst.

[0054] When the refractory silicon material is exposed to flames or high temperatures, cross-linking of silica (SiO2) occurs along with the decomposition of the silicon polymer, forming a ceramic substance. The refractory silicone layer 300 according to this example, even when exposed to internal flames and placed in a high-temperature environment, will neither burn nor melt, but can be ceramified and maintain electrical insulation.

[0055] As described above, within the glass fiber layer 400 which is a fabric, a space (S) is formed between intersecting glass fiber strands 400S, and a predetermined space can also be formed between the glass fiber layer 400 and the bus bar 200. Also, a space can be formed between the twisted glass fibers 400W which are twisted within the glass fiber strand 400S itself. During the process of injection molding the refractory silicone layer 300, the refractory silicone material can penetrate into such spaces. The refractory silicone layer 300 can fill the space between the woven glass fibers 400W.

[0056] In an environment of flames or high heat, when the refractory silicone layer 300 is ceramized, the electrical insulation of the refractory silicone layer 300 can be maintained, but the strength of the refractory silicone layer 300 becomes weak and it is highly likely to be damaged by an external force. In this embodiment, it is designed such that the refractory silicone layer 300 fills the space between the woven glass fibers 400W and the glass fiber layer 400 is positioned inside the refractory silicone layer 300. Thereby, the structural rigidity of the refractory silicone layer 300 can be complemented, and it can be prevented that the refractory silicone layer 300 is damaged by an external force even when the refractory silicone layer 300 is ceramized. In particular, since the refractory silicone material penetrates into the space between the glass fiber strands 400S within the glass fiber layer 400 which is a fabric and between the glass fibers 400W which are twisted within the glass fiber strand 400S itself, an improved rigidity of the refractory silicone layer 300 and a strong bonding force between the refractory silicone layer 300 and the glass fiber layer 400 can be realized. Finally, the bus bar assembly 100 according to this embodiment has improved fire resistance and can maintain electrical insulation even in an environment of flames or high heat.

[0057] Hereinafter, a bus bar assembly according to another embodiment of the present invention will be described in detail with reference to FIGS. 9 to 12.

[0058] FIG. 9 is a plan view showing a bus bar and a glass fiber layer included in a bus bar assembly according to another embodiment of the present invention. FIG. 10 is a cross-sectional view showing a cross-section cut along the cutting line C-C' of FIG. 9.

[0059] Referring to FIGS. 9 and 10, a bus bar assembly 100b according to another embodiment of the present invention includes a bus bar 200 and a glass fiber 400W, and includes a glass fiber layer 400 that wraps the bus bar 200. At this time, the glass fiber layer 400 may include an inner glass fiber layer 400a that wraps the bus bar 200 and an outer glass fiber layer 400b that wraps the bus bar 200 outside the inner glass fiber layer 400a. That is, the glass fiber layer 400 according to the present embodiment can have a multilayer structure composed of an inner glass fiber layer 400a and an outer glass fiber layer 400b. Specifically, although not shown in the drawings, the glass fiber layer according to another embodiment of the present invention can have a multilayer structure of three or more layers.

[0060] Each of the inner glass fiber layer 400a and the outer glass fiber layer 400b may be a fabric in a form in which the glass fiber 400W is woven. More specifically, a large number of glass fibers 400W are twisted to form glass fiber strands 400S, and such glass fiber strands 400S are woven, and an inner glass fiber layer 400a and an outer glass fiber layer 400b in the form of a fabric can be provided. A space (S1) can be formed between the intersecting glass fiber strands 400S in the inner glass fiber layer 400a which is a fabric, and similarly, a space (S2) can be formed between the intersecting glass fiber strands 400S in the outer glass fiber layer 400b which is a fabric. Also, a predetermined space (S3) can be formed between the inner glass fiber layer 400a and the outer glass fiber layer 400b, and a predetermined space (S4) can also be formed between the inner glass fiber layer 400a and the bus bar 200. This is due to the fact that each of the inner glass fiber layer 400a and the outer glass fiber layer 400b is a fabric. In FIG. 8, for convenience of explanation, these spaces are exaggeratedly shown.

[0061] FIG. 11 is a plan view showing a state in which a refractory silicone layer is provided in the bus bar assembly of FIG. 9. FIG. 12 is a cross-sectional view showing a cross-section cut along the cutting line D-D' of FIG. 11.

[0062] Referring to FIGS. 9 to 12 together, the busbar assembly 100b according to this embodiment may further include a refractory silicone layer 300 that fills the space between the inner glass fiber layer 400a and the outer glass fiber layer 400b and wraps the busbar 200. That is, the refractory silicone material can be injection molded onto the busbar 200 surrounded by the inner glass fiber layer 400a and the outer glass fiber layer 400b to manufacture the refractory silicone layer 300. Thereby, the glass fiber 400W of the inner glass fiber layer 400a and the glass fiber 400W of the outer glass fiber layer 400b can be located inside the refractory silicone layer 300.

[0063] In the process of injection molding the refractory silicone layer 300, the refractory silicone material can penetrate into the respective internal spaces (S1, S2) of the inner glass fiber layer 400a and the outer glass fiber layer 400b, and the refractory silicone material can also penetrate into the space (S3) between the inner glass fiber layer 400a and the outer glass fiber layer 400b. That is, the refractory silicone layer 300 can fill the spaces (S1, S2) between the glass fiber strands 400S woven inside the inner glass fiber layer 400a and the outer glass fiber layer 400b respectively, and can also fill the space (S3) between the inner glass fiber layer 400a and the outer glass fiber layer 400b. The refractory silicone layer 300 can penetrate between the glass fibers 400W that are twisted inside the glass fiber strands 400S themselves.

[0064] Since the busbar assembly 100b according to this embodiment is designed such that the inner glass fiber layer 400a and the outer glass fiber layer 400b are located inside the refractory silicone layer 300, similar to the busbar assembly 100a described with reference to FIGS. 6 to 8 above, it can complement the structural rigidity of the refractory silicone layer 300 and prevent the refractory silicone layer 300 from being broken by an external force even when it is ceramized. Finally, the busbar assembly 100b according to this embodiment has improved fire resistance and can maintain electrical insulation even in a flame or high-temperature environment.

[0065] In particular, the inner glass fiber layer 400a reinforces the structural rigidity of the refractory silicone layer 300 itself, and can protect internal components such as the bus bar 200 even if the outer glass fiber layer 400b or the refractory silicone layer 300 in the outer part is damaged. On the other hand, in addition to enhancing the structural rigidity, the outer glass fiber layer 400b functions to prevent the inner refractory silicone layer 300 and the inner glass fiber layer 400a from being directly exposed to flames or the like. Further, the outer glass fiber layer 400b can protect the internal bus bar 200 from physical external forces and prevent short circuits from occurring.

[0066] In this embodiment, terms indicating directions such as front, rear, left, right, up, and down are used, but such terms are for convenience of explanation and may vary depending on the position of the object to be described or the position of the observer.

[0067] One or more battery modules according to the above-described embodiment can be mounted together with various control and protection systems such as a BMS (Battery Management System), a BDU (Battery Disconnect Unit), and a cooling system to form a battery pack.

[0068] The battery module and the battery pack can be applied to various devices. Specifically, they can be applied to transportation means such as electric bicycles, electric vehicles, hybrids, and ESSs (Energy Storage Systems), but are not limited thereto, and can be applied to various devices that can use secondary batteries.

[0069] As described above, the preferred embodiments of the present invention have been described in detail. However, the scope of the rights of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims also belong to the scope of the rights of the present invention.

Description of Reference Numerals

[0070] 100, 100a, 100b bus bar assemblies 200 bus bar 300 Refractory silicone layer 400 Glass fiber layer 400a Inner glass fiber layer 400b Outer glass fiber layer 400S Glass fiber strand 1000 Battery pack 1100 Pack frame 1200 Battery module 1300 BDU module 1400 BMS module

Claims

1. A bus bar for guiding electrical connection inside a battery pack; A glass fiber layer containing glass fibers and wrapping the bus bar; A refractory silicone layer filling the space of the glass fiber layer and wrapping the bus bar; and A glass fiber tape wrapping the refractory silicone layer; A bus bar assembly comprising.

2. The bus bar assembly according to claim 1, wherein the refractory silicone layer is provided with a refractory silicone material on the outer surface of the bus bar in a state of being wrapped by the glass fiber layer.

3. The bus bar assembly according to claim 1, wherein the glass fiber layer is a fabric in a form in which the glass fibers are woven.

4. The bus bar assembly according to claim 3, wherein the refractory silicone layer fills the space between the woven glass fibers.

5. The bus bar assembly according to claim 1, wherein the glass fiber layer includes an inner glass fiber layer wrapping the bus bar and an outer glass fiber layer wrapping the bus bar outside the inner glass fiber layer.

6. The bus bar assembly according to claim 5, wherein each of the inner glass fiber layer and the outer glass fiber layer is a fabric in a form in which the glass fibers are woven.

7. The bus bar assembly according to claim 6, wherein the refractory silicone layer fills the space between the glass fibers woven inside each of the inner glass fiber layer and the outer glass fiber layer.

8. The bus bar assembly according to claim 6, wherein the refractory silicone layer fills the space between the inner glass fiber layer and the outer glass fiber layer.

9. The bus bar assembly according to claim 1, wherein the refractory silicone layer contains a silicone material that is ceramized at high temperature.

10. At least one bus bar assembly according to any one of claims 1 to 9; A battery module; A BDU (Battery Disconnect Unit) module for controlling the electrical connection of the battery module; and A BMS (Battery Management System) module for monitoring and controlling the operation of the battery module, At least one of the bus bar assemblies is a battery pack that electrically connects at least one of between the battery modules, between the battery module and the BDU module, between the battery module and the BMS module, or between the BDU module and the BMS module.

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