Bus bar assembly and battery pack including the same

Abstract

A bus bar assembly according to an embodiment of the present invention comprises: a bus bar for guiding an electrical connection in a battery pack; the glass fiber layer comprises glass fibers and wraps the bus bar; a fireproof silicone layer filling the empty space of the glass fiber layer and wrapping the bus bar; and a glass fiber tape surrounding the fire-resistant silicone layer.

Description

Technical Field

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the priority of Korean Patent Application No. 10-2023-0011439 filed on January 30, 2023 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety.

[0003] The present disclosure relates to a bus bar assembly and a battery pack including the same, and more particularly, to a bus bar assembly having improved fire resistance and a battery pack including the same. Background Art

[0004] In modern society, as portable devices such as mobile phones, laptop computers, camcorders, and digital cameras have been used daily, the development of technology in the field related to the mobile devices as described above has been promoted. In addition, rechargeable / dischargeable secondary batteries are used as power sources for electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (P-HEVs), etc., in an attempt to solve the air pollution caused by existing gasoline vehicles using fossil fuels, etc. Therefore, the demand for the development of secondary batteries is growing.

[0005] Currently commercialized secondary batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries, lithium secondary batteries, etc. Among them, lithium secondary batteries have attracted attention because they have advantages such as showing almost no memory effect compared to nickel-based secondary batteries and thus being freely charged and discharged, and having a very low self-discharge rate and high energy density.

[0006] Such lithium secondary batteries generally use lithium-based oxides and carbon materials as positive electrode active materials and negative electrode active materials, respectively. The lithium secondary battery includes an electrode assembly in which a positive electrode plate and a negative electrode plate coated with a positive electrode active material and a negative electrode active material, respectively, are arranged with a separator sandwiched therebetween, and an external material or battery case sealably accommodates the electrode assembly together with an electrolyte.

[0007] According to the shape of external materials, generally lithium secondary batteries can be divided into can type secondary batteries in which an electrode assembly is incorporated into a metal can and pouch type batteries in which an electrode assembly is incorporated into a pouch of an aluminum laminate.

[0008] In the case of a secondary battery for a small device, two to three battery cells are provided, but in the case of a secondary battery for a medium and large device such as an automobile, a battery module in which a plurality of battery cells are electrically connected is used. In such a battery module, a plurality of battery cells are connected to each other in series or in parallel to form a battery assembly, thereby improving capacity and output. In addition, one or more battery modules may be installed 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.

[0009] In a battery pack configured to aggregate a plurality of battery modules, heat generated from a plurality of battery cells may be accumulated in a narrow space, so that the temperature may be excessively increased more rapidly. In other words, a battery module in which a plurality of battery cells are stacked and a battery pack equipped with these battery modules can obtain high output, but it is not easy to remove heat generated from the battery cells during charging and discharging. When heat dissipation of the battery cells is not properly performed or a thermal runaway phenomenon occurs in the battery cells, the possibility of explosion or fire increases.

[0010] Meanwhile, bus bars connected to the battery modules are provided inside the battery pack. Figure 1 is a plan view showing a conventional bus bar, Figure 2 is shown along Figure 1 A cross-sectional view of the section taken along the cutting line AA' in FIG.

[0011] Reference Figure 1 and Figure 2 , the conventional bus bar 20 is a rod-shaped metal part extending in the longitudinal direction, and through holes for connecting with the terminal bus bar of the battery module may be formed at both ends of the bus bar 20. Such a bus bar 20 is configured to be responsible for the HV (high voltage) connection in the battery pack. The HV connection refers to a connection used as a power source to supply power, and the bus bar 20 is configured to guide the electrical connection of the battery module and generally includes a metal material with excellent conductivity. As an example, the bus bar 20 may include a copper (Cu) material.

[0012] The cover member 20C may surround such a bus bar 20. The cover member 20C may include an electrically insulating material, for example, a silicone material or an epoxy resin material. Since the cover member 20C surrounds the bus bar 20 through which a high current flows, the bus bar 20 may be prevented from contacting other electrical devices or conductive members other than the terminal bus bar of the battery module, thereby interrupting the generation of a short circuit.

[0013] In recent years, the battery pack is required to have a device that does not eject flames to the outside of the battery pack even if a fire 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 surrounding the bus bar 20 may melt, so that the bus bar 20 may be exposed. If the exposed bus bar 20 contacts another electrical component or a conductive member to cause a short circuit, the internal flame may spread further, and the flame may propagate to the outside of the battery pack. This may eventually lead to the explosion of the battery pack or a vehicle equipped with the battery pack.

[0014] Therefore, there is a need to develop a technology for a bus bar assembly that can maintain electrical insulation properties even if a fire occurs inside a battery pack. Summary of the invention

[0015] Technical issues

[0016] An object of the present disclosure is to provide a bus bar assembly that can maintain electrical insulation characteristics without melting even if a fire occurs inside the battery pack, and a battery pack including the same.

[0017] However, the technical problems to be solved by the embodiments of the present disclosure are not limited to the above-mentioned problems, and various extensions can be made within the scope of the technical ideas included in the present disclosure.

[0018] Technical Solution

[0019] According to one embodiment of the present invention, a bus bar assembly is provided, which includes: a bus bar, which is used to guide electrical connections inside a battery pack; a glass fiber layer, which includes glass fibers and surrounds the bus bar; a fire-resistant silicone layer, which fills the empty space of the glass fiber layer and surrounds the bus bar; and a glass fiber tape, which surrounds the fire-resistant silicone layer.

[0020] The fire-resistant silicone layer may be formed by injection-molding a fire-resistant silicone material onto the bus bar in a state of being surrounded by the glass fiber layer.

[0021] The glass fiber layer may be in the shape of a fabric woven from the glass fibers.

[0022] The fire-resistant silicone layer may fill the spaces between the woven glass fibers.

[0023] A glass fiber tape may surround the outer peripheral surface of the fire-resistant silicone layer.

[0024] The fiberglass tape may be a rectangular tape having a long side and a short side, and the fiberglass tape surrounds the fire-resistant silicone layer along the long side of the fiberglass tape.

[0025] The glass fiber tape may be wound around the fire-resistant silicone layer a plurality of times in the longitudinal direction of the bus bar to form an overlapping layer in at least a partial region.

[0026] The glass fiber tape may be obliquely wound around the fire-resistant silicone layer a plurality of times so that a partial area between any one layer of the glass fiber tape and another layer adjacent to the any one layer overlaps.

[0027] The refractory silicone layer may include a silicone material that ceramizes at high temperatures.

[0028] According to another embodiment of the present disclosure, a battery pack is provided, comprising: at least one bus bar assembly as described above; a battery module; a BDU (battery disconnect unit) module, which controls the electrical connection of the battery module; and a BMS (battery management system) module, which monitors and controls the operation of the battery module, wherein at least one bus bar assembly electrically connects at least one of 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.

[0029] Beneficial Effects

[0030] According to an embodiment of the present disclosure, a refractory silicone layer ceramicized under high temperature or flame, a glass fiber layer that supplements the structural rigidity of the refractory silicone layer, and a glass fiber tape surrounding the refractory silicone layer are provided in a bus bar assembly, thereby maintaining the electrical insulation performance of the bus bar assembly even under high temperature or flame conditions.

[0031] Effects obtainable from the present disclosure are not limited to the above-mentioned effects, and additional other effects not mentioned herein will be clearly understood by those skilled in the art from the description of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a plan view showing a conventional bus bar.

[0033] Figure 2 is shown along Figure 1 A cross-sectional view of the section taken along the cutting line AA' in FIG.

[0034] Figure 3 is a plan view showing a battery pack according to an embodiment of the present disclosure.

[0035] Figure 4 It is shown that the Figure 3 A three-dimensional view of one of the battery modules in a battery pack.

[0036] Figure 5It is shown in Figure 4 A partial three-dimensional image of a battery module with the module frame and end plates removed.

[0037] Figure 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 disclosure.

[0038] Figure 7 It is shown in Figure 6 A plan view of a state in which a fire-resistant silicone layer is provided in a bus bar assembly.

[0039] Figure 8 is shown along Figure 7 A cross-sectional view of a section taken along the cutting line BB'.

[0040] Fig. 9 The glass fiber tape is shown wrapped around Figure 7 A plan view of the state of the bus bar assembly. DETAILED DESCRIPTION

[0041] Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the embodiments. The present disclosure can be modified in various different ways and is not limited to the embodiments set forth herein.

[0042] For clarity, descriptions of parts not related to the explanation will be omitted, and the same reference numerals will be used throughout the description to denote the same or similar elements.

[0043] In addition, in the drawings, for the convenience of description, the size and thickness of each element are arbitrarily shown, and the present disclosure is not necessarily limited to those shown in the drawings. In the drawings, for the sake of clarity, the thickness, area, etc. of the layer are exaggerated. In the drawings, for the convenience of description, the thickness and area of ​​the components are magnified.

[0044] Furthermore, it should be understood that when an element such as a layer, film, region, or plate is referred to as being "on" or "over" another element, it can be directly on the other element, or intervening elements may also be present. Conversely, when an element is referred to as being "directly on" another element, this means that there are no other intervening elements. Furthermore, a portion being "on" or "over" a reference portion means a portion being above or below the reference portion, and does not specifically mean a portion being "on" or "over" in the opposite direction of gravity.

[0045] In addition, throughout the specification, when a part is referred to as “including” or “comprising” a certain part, it means that the part may further include other parts, without excluding the other parts, unless otherwise specified.

[0046] Furthermore, throughout the specification, when referred to as a “plane”, it means when the target portion is viewed from the upper side, and when referred to as a “cross section”, it means when the target portion is viewed from one side of the cross section cut vertically.

[0047] Figure 3 is a plan view showing a battery pack according to an embodiment of the present disclosure.

[0048] Reference Figure 3 , a battery pack 1000 according to one embodiment of the present disclosure includes: a bus bar 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, which monitors and controls the operation of the battery module 1200. At least one bus bar assembly 100 according to the present embodiment electrically connects at least one of the battery modules 1200, the battery module 1200 and the BDU module 1300, the battery module 1200 and the BMS module 1400, or the BDU module 1300 and the BMS module 1400. Specifically, a plurality of battery modules 1200 may be accommodated in a battery pack frame 1100, and the electrical connection between the battery modules 1200 or the electrical connection between the battery modules 1200 and the BDU module 1300 may be formed by the bus bar assembly 100. That is, the bus bar assembly 100 according to the present embodiment may be responsible for HV (high voltage) connection. Here, the HV connection is a power supply connection for supplying electric power requiring a high voltage, and refers to a connection between battery cells or a connection between battery modules.

[0049] Meanwhile, the BDU module 1300 is a member for controlling the electrical connection of the battery module 1200, and can cut off the power between the power converter and the battery module 1200. When a current exceeds a set range, the BDU module 1300 can cut off the power of the battery pack 1000 to ensure the safety of the battery pack 1000.

[0050] At the same time, the LV connecting member 100' according to the present embodiment can be responsible for the electrical connection between the battery module 1200 and the BMS module 1400. The electrical connection here is a LV (low voltage) connection, which means a sensing connection for detecting and controlling the voltage and temperature of the battery module 1200. Specifically, sensors and the like are arranged inside the battery module 1200, and the real-time temperature information or voltage information of the battery module 1200 is transmitted to the BMS module 1400 via the LV connecting member 100'. The real-time operating status of the battery module 1200 can be monitored and controlled by the BMS module 1400. Although not specifically shown, the HV current sensor can be integrated into the BMS module 1400. In this case, the bus bar assembly according to the present 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.

[0051] Next, we will refer to Figure 4 and Figure 5 A battery module 1200 according to the present embodiment is described. In this regard, the battery module 1200 described below has one exemplary structure of a battery module including a plurality of battery cells 11 , and various types of battery modules including a plurality of battery cells may be applied.

[0052] Figure 4 It is shown that the Figure 3 A three-dimensional view of one of the battery modules in a battery pack. Figure 5 It is shown in Figure 4 A partial three-dimensional image of a battery module with the module frame and end plates removed.

[0053] Reference Figure 4 and Figure 5 , the battery module 1200 according to the present embodiment may include a battery cell stack 11A in which a plurality of battery cells 11 are stacked. Figure 5 Such a battery cell stack 11A may be accommodated in a module frame 30 and an end plate 40 .

[0054] The battery cell 11 may be a pouch-type battery cell. Such a pouch-type battery cell may be formed by housing an electrode assembly in a pouch shell made of a laminate sheet including a resin layer and a metal layer, and then fusing the outer peripheral portion of the pouch shell. Such a battery cell 11 may be formed into a rectangular sheet structure. The electrode lead 11L connected to the electrode assembly protrudes to the outside of the pouch shell, wherein the electrode lead 11L of each battery cell 11 may be electrically connected to each other via a lead bus bar 21. On the other hand, at least one electrode lead 11L may be connected to a terminal bus bar 22. As Figure 4As shown, a portion of the terminal bus bar 22 may be exposed to the outside of the battery module 1200. Both the lead bus bar 21 and the terminal bus bar 22 may include a metal material having excellent electrical conductivity.

[0055] The bus bar assembly 100 according to the present embodiment is electrically connected to such a terminal bus bar 22, thereby enabling the above-mentioned HV connection. 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.

[0056] As mentioned above, Figure 4 and Figure 5 The battery cells and battery modules described in are exemplary structures, and the type or form of the battery cells and battery modules included in the battery pack to which the bus bar assembly according to the present embodiment is applied is not particularly limited. That is, although the description is made taking the pouch-type battery cells as an example, according to the embodiments of the present disclosure, square battery cells or cylindrical battery cells may also be applied to the battery module. In addition, the battery module in which the battery cells are accommodated in the module frame is described as an example, but a CTP (cell-to-pack) type battery module in which a plurality of battery cells are mounted on the battery pack and not accommodated in the module frame may also be used as an example application of the present disclosure.

[0057] Next, we will refer to Figures 6 to 9 A bus bar assembly according to an embodiment of the present disclosure is described in detail.

[0058] Figure 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 disclosure.

[0059] Reference Figure 6 , the bus bar assembly 100 according to an embodiment of the present disclosure includes: a bus bar 200 for guiding electrical connection within a battery pack 1000 ; and a glass fiber layer 400 including glass fibers 400W and surrounding the bus bar 200 .

[0060] The bus bar 200 is configured to guide the electrical connection (ie, HV connection) of the battery module and may include a metal material having excellent conductivity. As an example, the bus bar 200 may include a copper (Cu) material. The bus bar 200 may be a metal rod extending in the longitudinal direction Ld.

[0061] The glass fiber layer 400 may be a fabric formed in a shape of woven glass fibers 400W. For example, a plurality of glass fibers 400W are twisted and entangled to form a glass fiber bundle 400S, and such a glass fiber bundle 400S may be woven to provide a glass fiber layer 400 in a fabric form. The weaving method is not particularly limited, and various weaving methods such as plain weave, twill weave, and satin weave may be applied. The glass fiber layer 400 may surround the outer peripheral surface of the bus bar 200 except for a partial area of ​​both ends of the bus bar 200 connected to the terminal bus bar 22 (see FIG. 2 ). Figure 5 ). Since the glass fiber layer 400 is a fabric, a space S may be formed between the glass fiber bundles 400S crossing within the glass fiber layer, and a predetermined space may also be formed between the glass fiber layer 400 and the bus bar 200. In addition, a space may be formed between the glass fibers 400W twisted and entangled within the glass fiber bundle 400S itself.

[0062] Figure 7 It is shown in Figure 6 A plan view of a state in which a fire-resistant silicone layer is provided in a bus bar assembly. Figure 8 is shown along Figure 7 A cross-sectional view of a section taken along the cutting line BB'.

[0063] Refer to Figures 6 to 8 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 surrounds the bus bar 200. Figure 6 As shown, the fire-resistant silicone layer 300 can be provided by injection-molding the fire-resistant silicone material on the outer peripheral surface of the bus bar 200 while the bus bar 200 is surrounded by the glass fiber layer 400. That is, the fire-resistant silicone layer 300 according to the present embodiment can be formed by injection-molding the fire-resistant silicone material onto the bus bar 200 in a state surrounded by the glass fiber layer 400. Thus, the glass fibers 400W of the glass fiber layer 400 can be located inside the fire-resistant silicone layer 300. Figure 8 The state of the woven glass fiber bundle 400S is shown, but this is an example of the present disclosure, and if the glass fiber layer 400 in the present disclosure is a fabric woven from glass fibers 400W, the shape or weaving method of the woven glass fibers is not particularly limited.

[0064] The fire-resistant silicone layer 300 may surround the outer peripheral surface of the bus bar 200 except for a partial area of ​​both ends of the bus bar 200 connected to the terminal bus bar 22 (see Figure 5 ). The fire-resistant silicone layer 300 having an electrical insulating property serves as an insulating layer to protect the bus bar 200, thereby preventing the bus bar 200 from contacting other electrical devices or conductive members and causing a short circuit.

[0065] Unlike ordinary silicone materials that burn when exposed to flames or at high temperatures, refractory silicone materials are materials that are formed into ceramics when exposed to flames or at high temperatures. Refractory silicone materials can be silicone materials that are ceramicized when the temperature exceeds a certain temperature. Refractory silicone materials can include silicone polymers and silicon dioxide. The silicone polymer used can be a polysilicone-based compound having vinyl as a functional group, and corresponds to the base material of the refractory silicone material. Silicon dioxide can be fumed silica, which is a reinforcing filler contained in the silicone polymer. High-purity silicon chloride (SiCl 4 ) compounds can be produced using metallic silicon as the main raw material, through a reaction with hydrochloric acid and a purification process, and this can be reacted with hydrogen and oxygen in a high temperature flame to obtain fumed silica. In addition, refractory silicones may contain platinum Pt as a catalyst.

[0066] When refractory silicone materials are exposed to flames or high temperatures, silicon dioxide (SiO 2 ) is cross-linked with the decomposition of the silicone polymer to form a ceramic material. The refractory silicone layer 300 according to the present embodiment does not burn or melt, but can be ceramicized and maintain electrical insulation properties even when exposed to flames or placed in a high temperature environment.

[0067] As described above, the space S may be formed between the crossed glass fiber bundles 400S in the glass fiber layer 400 as a woven fabric, and a predetermined space may also be formed between the glass fiber layer 400 and the bus bar 200. In addition, spaces may be formed between the glass fibers 400W, which are twisted and entangled within the glass fiber bundles 400S themselves. During the injection molding of the fire-resistant silicone layer 300, the fire-resistant silicone material may penetrate into these spaces. The fire-resistant silicone layer 300 may fill the spaces between the woven glass fibers 400W.

[0068] When the fire-resistant silicone layer 300 is ceramicized in a flame or high temperature environment, the electrical insulation performance of the fire-resistant silicone layer 300 can be maintained, but the strength of the fire-resistant silicone layer 300 becomes weaker and is more likely to be broken by external force. In the present embodiment, it is designed so that the fire-resistant silicone layer 300 fills the space between the woven glass fibers 400W, and the glass fiber layer 400 is located inside the fire-resistant silicone layer 300. Thus, the structural rigidity of the fire-resistant silicone layer 300 can be supplemented, and even if the fire-resistant silicone layer 300 is ceramicized, it is attempted to prevent it from being broken by external force. In particular, the fire-resistant silicone material penetrates into the space between the glass fiber bundles 400S in the glass fiber layer 400 as a fabric, or penetrates into the space between the glass fibers 400W twisted inside the glass fiber bundles 400S themselves, so that the enhanced rigidity of the fire-resistant silicone layer 300 and the strong bonding strength between the fire-resistant silicone layer 300 and the glass fiber layer 400 can be achieved. Finally, the bus bar assembly 100 according to the present embodiment has improved fire resistance and can maintain electrical insulation performance even in a flame or high temperature environment.

[0069] Fig. 9 The glass fiber tape is shown wrapped around Figure 7 A plan view of the state of the bus bar assembly.

[0070] Reference Fig. 9 The bus bar assembly 100 according to the embodiment of the present disclosure further includes a glass fiber tape 500 surrounding the fire-resistant silicone layer 300. The glass fiber tape may surround the outer peripheral surface of the fire-resistant silicone layer 300.

[0071] The glass fiber tape 500 may include a glass fiber base layer and an adhesive layer formed on one surface of the glass fiber base layer. The glass fiber substrate layer may be a fabric containing glass fibers, and the adhesive layer may include at least one of an acrylic resin or a silicone resin. The glass fiber tape 500 may be a rectangular tape having a long side 500L and a short side 500S. That is, the long side 500L here refers to the relatively long side of the rectangular tape, and the short side 500S refers to the relatively short side of the rectangular tape. Such a glass fiber tape 500 may surround the fire-resistant silicone layer 300 along the long side 500L of the glass fiber tape 500. Specifically, the glass fiber tape 500 may be wound around the fire-resistant silicone layer 300 multiple times along the longitudinal direction Ld of the busbar 200 so as to form overlapping layers 510 and 520 in at least a partial region. Here, the layers 510 and 520 of the glass fiber tape 500 correspond to an interlayer structure formed by overlapping at least a partial region of the adjacent portions of the glass fiber tape 500. More specifically, the glass fiber tape 500 may be obliquely wound around 300 for multiple times so that a portion of a layer 510 of the glass fiber tape 500 overlaps with another layer 520 adjacent thereto. Fig. 9, partial areas of both end portions of the fire-resistant silicone layer 300 are shown as being exposed without being wrapped around the glass fiber tape 500 , however, this is for convenience of explanation, and the entire area of ​​the fire-resistant silicone layer 300 may be surrounded by the glass fiber tape 500 .

[0072] The glass fiber tape 500 can protect the glass fiber layer 400 and the fire-resistant silicone layer 300 from the flame. That is, the glass fiber tape 500 completely surrounds the fire-resistant silicone layer 300 and can temporarily protect the glass fiber layer 400 and the fire-resistant silicone layer 300 from the flame generated inside the battery pack.

[0073] In addition, the glass fiber tape 500 can supplement the structural rigidity of the bus bar 200 and the fire-resistant silicone layer 300 to improve the insulation performance of the bus bar 200. Specifically, when the fire-resistant silicone layer 300 is ceramicized, the insulation performance is maintained, but the strength becomes weak, so that the fire-resistant silicone layer 300 may be broken by an external force. The glass fiber tape 500 can supplement the rigidity of the fire-resistant silicone layer 300 and prevent the fire-resistant silicone layer 300 from being broken by an external force.

[0074] In this embodiment, terms indicating directions such as the front side, the back side, the left side, the right side, the upper side, and the lower side are used, but the terms used are provided only for the convenience of description and may become different depending on the position of the object, the position of the observer, etc.

[0075] One or more battery modules according to the embodiments of the present disclosure described above may be installed 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.

[0076] The battery module or battery pack can be applied to various devices. Specifically, it can be applied to vehicle devices such as electric bicycles, electric vehicles and hybrid vehicles or ESS (Energy Storage System), and can be applied to various devices that can use secondary batteries, without being limited thereto.

[0077] Although the present invention has been described in detail with reference to the preferred embodiments thereof, the scope of the present disclosure is not limited thereto and those skilled in the art may make various modifications and improvements using the basic concepts of the present disclosure defined in the appended claims, which also fall within the scope of the present disclosure.

[0078] Description of Reference Numerals

[0079] 100: Busbar assembly

[0080] 200: Busbar

[0081] 300: Fire-resistant silicone layer

[0082] 400: Glass fiber layer

[0083] 400S: Fiberglass Bundle

[0084] 500: Fiberglass tape

[0085] 1000: Battery Pack

[0086] 1100: Battery Pack Frame

[0087] 1200: Battery module

[0088] 1300: BDU module

[0089] 1400: BMS module

Claims

1. A bus bar assembly, comprising: A bus bar used to guide electrical connections inside the battery pack; a fiberglass layer comprising glass fibers and surrounding the bus bar; a fire-resistant silicone layer filling empty spaces of the glass fiber layer and surrounding the bus bar; and A fiberglass tape surrounds the fire-resistant silicone layer.

2. The bus bar assembly according to claim 1, wherein: The fire-resistant silicone layer is formed by injection-molding a fire-resistant silicone material onto the bus bar in a state of being surrounded by the glass fiber layer.

3. The bus bar assembly according to claim 1, wherein: The glass fiber layer is a fabric woven from the glass fibers.

4. The bus bar assembly according to claim 3, wherein: The fire-resistant silicone layer fills the spaces between the woven glass fibers.

5. The bus bar assembly according to claim 1, wherein: The glass fiber tape surrounds the outer peripheral surface of the fire-resistant silicone layer.

6. The bus bar assembly according to claim 1, wherein: The fiberglass tape is a rectangular tape having a long side and a short side, and The fiberglass tape surrounds the fire-resistant silicone layer along the long sides of the fiberglass tape.

7. The bus bar assembly according to claim 1, wherein: The glass fiber tape is wound around the fire-resistant silicone layer a plurality of times in the longitudinal direction of the bus bar to form an overlapping layer in at least a partial region.

8. The bus bar assembly according to claim 7, wherein: The glass fiber tape is obliquely wound around the fire-resistant silicone layer a plurality of times so that a partial area between any one layer of the glass fiber tape and another layer adjacent to the any one layer overlaps.

9. The bus bar assembly according to claim 1, wherein: The refractory silicone layer includes a silicone material that ceramizes at high temperatures.

10. A battery pack, comprising: At least one bus bar assembly according to claim 1; Battery modules; A BDU (Battery Disconnect Unit) module, the BDU module controls the electrical connection of the battery module; as well as A BMS (Battery Management System) module that monitors and controls the operation of the battery module, At least one of the bus bar assemblies electrically connects at least one of the battery modules, the battery module and the BDU module, the battery module and the BMS module, or the BDU module and the BMS module.

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