Bus bar assembly and battery pack including 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; a glass fiber layer including glass fibers and wrapping the bus bar; and a fireproof silicon layer filling the spare space of the glass fiber layer and wrapping the bus bar.

Description

Technical Field

[0001] Cross-reference to related applications

[0002] This application claims the benefit of Korean Patent Application No. 10-2023-0011438 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, with the daily use of portable devices such as mobile phones, laptops, video cameras and digital cameras, technical development in the field related to the above mobile devices has been activated. In addition, rechargeable and dischargeable secondary batteries are used as power sources for electric vehicles (EV), hybrid electric vehicles (HEV), plug-in hybrid electric vehicles (P-HEV), etc., in an attempt to solve the problems of air pollution caused by existing gasoline vehicles using fossil fuels. 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 these secondary batteries, lithium secondary batteries have attracted attention due to their advantages, for example, they are less likely to exhibit a memory effect than nickel-based secondary batteries, are freely charged and discharged, have an extremely low self-discharge rate, and have a 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 positive electrode active materials and negative electrode active materials, respectively, are arranged (with a separator interposed therebetween), and an external material or battery case that seals and contains the electrode assembly together with an electrolyte.

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

[0008] In the case of a secondary battery for a small device, two to three battery cells are provided, and in the case of a secondary battery for a medium or 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 cell assembly, thereby increasing 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 bring together a plurality of battery modules, heat generated from a plurality of battery cells may accumulate in a small space, causing the temperature to rise faster and more dramatically. 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 the heat generated from the battery cells during charging and discharging is not easily removed. 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] In addition, bus bars connected to the battery modules are provided inside the battery pack. Figure 1 is a plan view showing a conventional bus bar, and Figure 2 is shown along Figure 1 A cross-sectional view of the cross 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 member extending in the longitudinal direction, and through holes for connecting to the terminal bus bars 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 electric 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 electrical 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, and may include, for example, a silicone material or an epoxy resin material. Since the cover member 20C surrounds the bus bar 20 through which a large current flows, it is possible to prevent the bus bar 20 from contacting other electrical devices or conductive members of the battery module other than the terminal bus bar, thereby interrupting the generation of a short circuit.

[0013] In recent years, it has been required that the battery pack be equipped with a device that does not spray flames to the outside of the battery pack even if a fire occurs inside the battery pack. Since the temperature of the flame generated inside the battery pack is very high, 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 conductive member to cause a short circuit, the internal flame may spread further, and the flame may spread to the outside of the battery pack. This may eventually cause 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 performance 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 capable of maintaining electrical insulation properties without melting even when a fire occurs inside a battery pack, and a battery pack including the bus bar assembly.

[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 concept included in the present disclosure.

[0018] Technical Solution

[0019] According to one embodiment of the present disclosure, a bus bar assembly is provided, which includes: a bus bar for guiding electrical connections inside a battery pack; a glass fiber layer including glass fibers and surrounding the bus bar; and a refractory silicon layer filling a free space of the glass fiber layer and surrounding the bus bar.

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

[0021] The glass fiber layer may be a fabric made in a shape in which glass fibers are woven.

[0022] A layer of refractory silica may fill the spaces between the woven glass fibers.

[0023] The fiberglass layer may include an inner fiberglass layer surrounding the bus bar and an outer fiberglass layer surrounding the bus bar outside the inner fiberglass layer.

[0024] Each of the inner fiberglass layer and the outer fiberglass layer may be a fabric made in a shape in which glass fibers are woven.

[0025] The refractory silica layer may fill the space between the glass fibers woven inside each of the inner and outer glass fiber layers.

[0026] A refractory silica layer may fill the space between the inner fiberglass layer and the outer fiberglass layer.

[0027] The refractory silicon 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, which includes: at least one of the above-mentioned bus bar assemblies; 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 following: between battery modules, between a battery module and a BDU module, between a battery module and a BMS module, or between a BDU module and a BMS module.

[0029] Beneficial Effects

[0030] According to an embodiment of the present disclosure, a refractory silicon layer ceramicized under high heat or flame and a glass fiber layer supplementing the structural rigidity of the refractory silicon layer are provided in the bus bar assembly, so that the bus bar assembly can maintain electrical insulation properties even under high heat 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 cross 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 Figure 3 A perspective view of one of the battery modules included in a battery pack.

[0036] Figure 5 It is shown Figure 4 A partial perspective view of a battery module in which a module frame and an end plate are removed.

[0037] Figure 6is 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 bus bar assembly is provided with a refractory silicon layer.

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

[0040] 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 disclosure.

[0041] Fig.10 is shown along Fig. 9 A cross-sectional view of the section taken along the cutting line CC'.

[0042] Fig.11 It is shown in Fig. 9 A plan view of a state in which a bus bar assembly is provided with a refractory silicon layer.

[0043] Fig.12 is shown along Fig.11 A cross-sectional view of a section taken along the cutting line D-D'. DETAILED DESCRIPTION

[0044] 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 these embodiments. The present disclosure can be modified in various different ways, and the present disclosure is not limited to the embodiments set forth herein.

[0045] For the sake of clarity, descriptions of parts not related to the present specification will be omitted, and the same reference numerals will be used throughout the specification to denote the same or similar elements.

[0046] 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 the size and thickness shown in the drawings. In the drawings, for the sake of clarity, the thickness of layers, regions, etc. are exaggerated. In the drawings, for the convenience of description, the thickness of parts and regions is exaggerated.

[0047] 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 be present. Conversely, when an element is referred to as being "directly on" another element, it means that no other intervening elements are present. Furthermore, a particular portion being "on" or "over" a reference portion means that the particular portion is above or below the reference portion, and does not specifically mean that the particular portion is "on" or "over" in the opposite direction of gravity.

[0048] Furthermore, throughout the specification, when a part is referred to as “including” or “comprising” specific components, unless otherwise specified, it means that the part may further include other components, rather than excluding the other components.

[0049] Furthermore, throughout the specification, when “plane” is mentioned, it means observing the target portion from above, and when “cross section” is mentioned, it means observing the target portion from one side of the cross section cut vertically.

[0050] Figure 3 is a plan view showing a battery pack according to an embodiment of the present disclosure.

[0051] 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 for monitoring and controlling the operation of the battery module 1200. At least one bus bar assembly 100 according to the present embodiment realizes at least one of the following electrical connections: between battery modules 1200, between battery module 1200 and BDU module 1300, between battery module 1200 and BMS module 1400, or between BDU module 1300 and BMS module 1400. Specifically, a plurality of battery modules 1200 may be accommodated in a battery pack frame 1100, and electrical connection between battery modules 1200 or electrical connection between battery module 1200 and BDU module 1300 may be performed through 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.

[0052] In addition, 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 the current exceeds the 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.

[0053] In addition, 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 represents 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 through the LV connecting member 100'. The real-time operating status of the battery module 1200 can be monitored and controlled via 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.

[0054] 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 employed.

[0055] Figure 4 It is shown Figure 3 A perspective view of one of the battery modules included in a battery pack. Figure 5 It is shown Figure 4 A partial perspective view of a battery module in which a module frame and an end plate are removed.

[0056] 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 1A shows a battery cell stack 11A. Such a battery cell stack 11A may be accommodated in a module frame 30 and an end plate 40.

[0057] 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 peripheral portion of the pouch shell. Such a battery cell 11 may be formed into a rectangular sheet structure. The electrode leads 11L connected to the electrode assembly protrude to the outside of the pouch shell, wherein the electrode leads 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. A portion of the terminal bus bar 22 may be exposed to the outside of the battery module 1200, such as Figure 4 Both the lead bus bar 21 and the terminal bus bar 22 may include a metal material having excellent electrical conductivity.

[0058] The bus bar assembly 100 according to the present embodiment is electrically connected to such a terminal bus bar 22, so that the above-mentioned HV connection can be achieved. That is, the battery module 1200 can be electrically connected to other battery modules 1200, the BDU module 1300, or the BMS module 1400 through the bus bar assembly 100 connected to the terminal bus bar 22.

[0059] As mentioned above, Figure 4 and Figure 5 The battery cells and battery modules described in are exemplary structures, and the types or forms 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 are not specifically limited. That is, although the pouch-type battery cells are described as an example, square battery cells or cylindrical battery cells may also be applied to the battery module according to the embodiment of the present disclosure. In addition, although the battery module in which the battery cells are housed in the module frame is described as an example, a CTP (cell-to-pack) type battery module in which a plurality of battery cells are not housed in the module frame but are mounted on the battery pack may also be adopted as an example of the present disclosure.

[0060] Next, we will refer to Figures 6 to 8 A bus bar assembly according to an embodiment of the present disclosure is described in detail.

[0061] 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.

[0062] Reference Figure 6 , the bus bar assembly 100 a 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 .

[0063] The bus bar 200 is configured to guide the electrical connection of the battery module, ie, HV connection, and may include a metal material having excellent electrical conductivity. As an example, the bus bar 200 may include a copper (Cu) material. The bus bar 200 may be a metal bar extending in the longitudinal direction Ld.

[0064] The glass fiber layer 400 may be a fabric formed in a shape in which the glass fibers 400W are woven. As an example, a plurality of glass fibers 400W are twisted and wound together 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 adopted. The glass fiber layer 400 may surround the outer peripheral surface of the bus bar 200, but does not include 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 woven in the glass fiber layer 400 , and a predetermined space may also be formed between the glass fiber layer 400 and the bus bar 200 .

[0065] Figure 7 It is shown in Figure 6 A plan view of a state in which a bus bar assembly is provided with a refractory silicon layer. Figure 8 is shown along Figure 7 A cross-sectional view of the cross section taken along the cutting line BB'.

[0066] Also refer to Figures 6 to 8 The bus bar assembly 100a according to the present embodiment further includes a refractory silicon layer 300 that fills the empty space S of the glass fiber layer 400 and surrounds the bus bar 200. Figure 6 As shown, the refractory silicon layer 300 may be provided by injection-molding the refractory 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 refractory silicon layer 300 according to the present embodiment may be formed by injection-molding the refractory 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 may be located inside the refractory silicon layer 300. Figure 8 The state of the woven glass fiber bundle 400S is shown, but this is just an example of the present disclosure, and as long as the glass fiber layer 400 in the present disclosure is a fabric made in a shape in which the glass fibers 400W are woven, there is no particular limitation on the shape or weaving method of the woven glass fibers.

[0067] The refractory silicon layer 300 may surround the outer peripheral surface of the bus bar 200, but does not include a partial area of ​​both ends of the bus bar 200 connected to the terminal bus bar 22 (see Figure 5 ). The refractory silicon layer 300 having an electrical insulating property serves as an insulating layer for protecting the bus bar 200, thereby preventing the bus bar 200 from contacting other electrical devices or conductive members and causing a short circuit.

[0068] Unlike common silicone materials that burn when exposed to flames or burn at high temperatures, refractory silicone materials are materials that are exposed to flames or formed into ceramics 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 polymers used can be polysiloxane compounds with vinyl groups as functional groups, and correspond to the matrix materials of refractory silicone materials. Silicon dioxide can be fumed silica, which is a reinforcing filler included in silicone polymers. Using metallized silicone as the main raw material, high-purity silicon chloride (SiCl4) compounds can be produced by reacting with hydrochloric acid and a purification process, and the compound can react with hydrogen and oxygen in a high-temperature flame to obtain fumed silica. In addition, refractory silicone can contain platinum Pt as a catalyst.

[0069] When the refractory silicone material is exposed to flame or high heat, silicon dioxide (SiO2) will crosslink together to form a ceramic material as the silicone polymer decomposes. The refractory silicon layer 300 according to the present embodiment will not burn or melt even if exposed to flame or placed in a high temperature environment, but can be ceramicized and maintain electrical insulation properties.

[0070] As described above, a space S may be formed between the intersecting glass fiber bundles 400S in the glass fiber layer 400 (which is a fabric), 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 wound within the glass fiber bundle 400S itself. In the injection molding process of the refractory silicon layer 300, the refractory silicone material may penetrate into these spaces. The refractory silicon layer 300 may fill the space between the woven glass fibers 400W.

[0071] When the refractory silicon layer 300 is ceramicized under flame or high temperature environment, the electrical insulation properties of the refractory silicon layer 300 can be maintained, but the strength of the refractory silicon layer 300 becomes weaker and is more likely to be broken due to external force. In the present embodiment, it has been designed so that the refractory silicon layer 300 fills the space between the woven glass fibers, and the glass fiber layer 400 is located inside the refractory silicon layer 300. Thus, the structural rigidity of the refractory silicon layer 300 can be supplemented, and even if the refractory silicon layer 300 is ceramicized, it can be tried to prevent it from being broken due to external force. Specifically, the refractory silicone material penetrates into the space between the glass fiber bundles 400S in the glass fiber layer 400 (which is a fabric) or in the space between the glass fibers 400W twisted in the glass fiber bundles 400S themselves, so that the rigidity of the refractory silicon layer 300 can be enhanced, and the strong bonding strength between the refractory silicon layer 300 and the glass fiber layer 400 can be achieved. Finally, the bus bar assembly 100 a according to the present embodiment has improved fire resistance and can maintain electrical insulation properties even in a flame or high temperature environment.

[0072] Next, we will refer to Figures 9 to 12 A bus bar assembly according to another embodiment of the present disclosure is described in detail.

[0073] 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 disclosure. Fig.10 is shown along Fig. 9 A cross-sectional view of the section taken along the cutting line CC'.

[0074] Reference Fig. 9 and Fig.10 , a bus bar assembly 100b according to another embodiment of the present disclosure may include a bus bar 200 and a glass fiber 400W, and includes a glass fiber layer 400 surrounding the bus bar 200. At this time, the glass fiber layer 400 may include an inner glass fiber layer 400a surrounding the bus bar 200 and an outer glass fiber layer 400b surrounding the bus bar 200 on the outer side of the inner glass fiber layer 400a. That is, the glass fiber layer 400 according to the present embodiment may have a multilayer structure of the inner glass fiber layer 400a and the outer glass fiber layer 400b. Although not specifically described, the glass fiber layer according to another embodiment of the present disclosure may have a multilayer structure of three or more layers.

[0075] Each of the inner glass fiber layer 400a and the outer glass fiber layer 400b may be a fabric formed in a shape in which the glass fiber 400W is woven. More specifically, a plurality of glass fibers 400W are twisted and wound to form a glass fiber bundle 400S, wherein such a glass fiber bundle 400S may be woven to provide the inner glass fiber layer 400a and the outer glass fiber layer 400b in a fabric form. In the inner glass fiber layer 400a (which is a fabric), a space S1 may be formed between the intersecting glass fiber bundles 400S, and similarly, in the outer glass fiber layer 400b (which is a fabric), a space S2 may be formed between the intersecting glass fiber bundles 400S. In addition, a predetermined space S3 may be formed between the inner glass fiber layer 400a and the outer glass fiber layer 400b, and a predetermined space S4 may 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. exist Figure 8 In the illustration, these spaces are exaggerated for ease of explanation.

[0076] Fig.11 It is shown in Fig. 9 A plan view of a state in which a bus bar assembly is provided with a refractory silicon layer. Fig.12 is shown along Fig.11 A cross-sectional view of a section taken along the cutting line D-D'.

[0077] Also refer to Figures 9 to 12 , the bus bar assembly 100b according to the present embodiment may further include a refractory silicon layer 300 that fills the empty space of the inner glass fiber layer 400a and the outer glass fiber layer 400b and surrounds the bus bar 200. That is, the refractory silicone material may be injection molded on the bus bar 200 surrounded by the inner glass fiber layer 400a and the outer glass fiber layer 400b, thereby producing the refractory silicon layer 300. Therefore, the glass fibers 400W of the inner glass fiber layer 400a and the glass fibers 400W of the outer glass fiber layer 400b may be located inside the refractory silicon layer 300.

[0078] During the injection molding of the refractory silicon layer 300, the refractory silicone material may penetrate into the inner spaces S1 and S2 of each of the inner glass fiber layer 400a and the outer glass fiber layer 400b, and the refractory silicone material may also penetrate into the space S3 between the inner glass fiber layer 400a and the outer glass fiber layer 400b. That is, the refractory silicon layer 300 may fill the spaces S1 and S2 between the glass fiber bundles 400S woven inside each of the inner glass fiber layer 400a and the outer glass fiber layer 400b, and may also fill the space S3 between the inner glass fiber layer 400a and the outer glass fiber layer 400b, and may penetrate between the glass fibers 400W twisted inside the glass fiber bundles 400S themselves.

[0079] The busbar assembly 100b according to the present embodiment is designed such that the inner glass fiber layer 400a and the outer glass fiber layer 400b are located inside the refractory silicon layer 300. Figures 6 to 8 The bus bar assembly 100a described in the embodiment is similar to the bus bar assembly 100a described in the embodiment, which can supplement the structural rigidity of the refractory silicon layer 300 and prevent it from being broken by external force even if the refractory silicon layer 300 is ceramicized. Finally, the bus bar assembly 100b according to the present embodiment has improved fire resistance and can maintain electrical insulation properties even in flames or high temperature environments.

[0080] Specifically, the inner glass fiber layer 400a strengthens the structural rigidity of the fire-resistant silicon layer 300 itself, and can protect the internal components such as the bus bar 200 even if the outer glass fiber layer 400b or the outer fire-resistant silicon layer 300 is broken. In addition, in addition to the structural rigidity, the outer glass fiber layer 400b can also play a role in preventing the inner fire-resistant silicon layer 300 and the inner glass fiber layer 400a from being directly exposed to flames, etc. In addition, the outer glass fiber layer 400b can protect the inner bus bar 200 from physical external forces, thereby preventing a short circuit from occurring.

[0081] In this embodiment, terms indicating directions such as front, back, left, right, top, and bottom are used, but the terms used are provided only for the convenience of description and may vary depending on the position of the object, the position of the observer, etc.

[0082] 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) module, a BDU (Battery Disconnect Unit) module, and a cooling system to form a battery pack.

[0083] 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 electric vehicles, or ESS (Energy Storage System), and can be applied to various devices that can use secondary batteries, but is not limited thereto.

[0084] Although the present invention has been described in detail in conjunction with preferred embodiments, 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 by the appended claims, which also fall within the scope of the present disclosure.

[0085] [Explanation of Reference Numerals]

[0086] 100, 100a, 100b: Bus bar assembly

[0087] 200: Busbar

[0088] 300: Refractory silicon layer

[0089] 400: Glass fiber layer

[0090] 400a: Inner fiberglass layer

[0091] 400b: Outer fiberglass layer

[0092] 400S: Fiberglass Bundle

[0093] 1000: Battery Pack

[0094] 1100: Battery Pack Frame

[0095] 1200: Battery module

[0096] 1300: BDU module

[0097] 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; as well as A refractory silicon layer fills the empty space of the glass fiber layer and surrounds the bus bar.

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 made in a shape in which the glass fibers are woven.

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

5. The bus bar assembly according to claim 1, wherein: The fiberglass layer includes an inner fiberglass layer surrounding the busbar and an outer fiberglass layer surrounding the busbar outside the inner fiberglass layer.

6. The bus bar assembly according to claim 5, wherein: Each of the inner fiberglass layer and the outer fiberglass layer is a fabric made in a shape in which the glass fibers are woven.

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

8. The bus bar assembly according to claim 6, wherein: The refractory silica layer fills the space between the inner fiberglass layer and the outer fiberglass layer.

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

10. A battery pack, comprising: at least one bus bar assembly, the at least one bus bar assembly being the 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, The at least one bus bar assembly electrically connects at least one of the following: 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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