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 connected to a battery module inside a battery pack to guide an electrical connection of the battery module; the fireproof silicone layer wraps the outer surface of the bus bar; and a glass fiber tape wrapping the fire resistant silicone layer. A plurality of recesses are formed on a surface of the refractory silicone layer.

Description

Technical Field

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the priority of Korean Patent Application No. 10-2023-0004100 filed on January 11, 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 (EV), hybrid electric vehicles (HEV), plug-in hybrid electric vehicles (P-HEV), 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 excessively rise more quickly. 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 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 disclosure, a busbar assembly is provided, comprising: a busbar for guiding electrical connections inside a battery pack; a refractory silicone layer surrounding the outer peripheral surface of the busbar; and a glass fiber tape surrounding the refractory silicone layer, wherein a plurality of grooves are formed on the surface of the refractory silicone layer.

[0020] The groove may be formed on a surface of the fire-resistant silicone layer facing the glass fiber tape.

[0021] A gas exhaust path may be formed between the fire-resistant silicone layer and the glass fiber tape through the groove.

[0022] The groove may be configured to be continuous along a certain direction.

[0023] The groove may include a first groove continuous in a first direction and a second groove continuous in a second direction perpendicular to the first direction.

[0024] The first direction may be parallel to a longitudinal direction of the bus bar.

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

[0026] The glass fiber tape may be obliquely wound around the fire-resistant silicone layer a plurality of times so that some areas between any one layer of the glass fiber tape and another layer adjacent thereto overlap.

[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: the bus bar assembly; a battery module; a BDU (battery disconnect unit) module, the BDU module being used to control the electrical connection of the battery module; and a BMS (battery management system) module, the BMS module monitoring and controlling the operation of the battery module, wherein the at least one bus bar assembly 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.

[0029] Beneficial effects

[0030] According to an embodiment of the present disclosure, a refractory silicone layer ceramicized under high heat or flame and a glass fiber tape surrounding the refractory silicone layer are provided in the bus bar assembly so that the electrical insulation property of the bus bar assembly can be maintained even if a flame occurs inside the battery pack.

[0031] In particular, a plurality of grooves are formed on the surface of the fire-resistant silicone layer so that gas generated when the bus bar assembly is exposed to flames can be quickly discharged.

[0032] Effects obtainable from the present disclosure are not limited to the above-mentioned effects, and further 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

[0033] Figure 1 is a plan view showing a conventional bus bar.

[0034] Figure 2 is shown along Figure 1 A cross-sectional view of the section taken along the cutting line AA' in FIG.

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

[0036] Figure 4 It is shown that the Figure 3 A three-dimensional view of one of the battery modules in a battery pack.

[0037] 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.

[0038] Figure 6 is a plan view showing a state in which a glass fiber tape is removed in a bus bar assembly according to an embodiment of the present disclosure.

[0039] Figure 7 is shown along Figure 6 A cross-sectional view of the section taken along the cutting line BB' in FIG.

[0040] Figure 8 The glass fiber tape is wound on Figure 6 A plan view of the state of the bus bar assembly.

[0041] Fig. 9 is shown along Figure 8 A cross-sectional view of the section taken along the cutting line CC'. DETAILED DESCRIPTION

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] Figure 3 is a plan view showing a battery pack according to an embodiment of the present disclosure.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] See also 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 .

[0055] 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.

[0056] 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 .

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

[0058] Figure 6 is a plan view showing a state in which a glass fiber tape is removed in a bus bar assembly according to an embodiment of the present disclosure. Figure 7 is shown along Figure 6 A cross-sectional view of the section taken along the cutting line BB' in FIG. Figure 8 The glass fiber tape is shown wrapped around Figure 6 A plan view of the state of the bus bar assembly. Fig. 9 is shown along Figure 8 A cross-sectional view of the section taken along the cutting line CC'.

[0059] Refer to Figures 6 to 9 , a 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 ; a fire-resistant silicone layer 300 surrounding an outer peripheral surface of the bus bar 200 ; and a glass fiber tape 400 surrounding the fire-resistant silicone layer 300 .

[0060] The bus bar 200 is configured to guide the electrical connection of the battery module, ie, the HV connection, 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 fire-resistant silicone layer 300 may include a fire-resistant silicone material. Specifically, the fire-resistant silicone material may be molded onto the outer peripheral surface of the bus bar 200, thereby forming the fire-resistant silicone layer 300. The fire-resistant silicone layer 300 may surround the outer peripheral surface of the bus bar 200, except for the portion of the bus bar 200 connected to the terminal bus bar 22 (see Figure 4 ) at both ends. The fire-resistant silicone layer 300 having electrical insulating properties 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.

[0062] Refractory silicone materials are materials that ceramicize when exposed to flames or under high heat, which are different from ordinary silicone materials that burn when exposed to flames or at high temperatures. Refractory silicone materials may include silicone polymers and silicon dioxide. The silicone polymer used may be a polysilicone-based compound having vinyl as a functional group, and corresponds to the base material of the refractory silicone material. Silicon dioxide may be fumed silica, which is a reinforcing filler contained in a silicone polymer. With metallic silicon as the main raw material, a high-purity silicon chloride (SiCl4) compound can be obtained by reacting with hydrochloric acid and a purification process, which can react with hydrogen and oxygen in a high-temperature flame to obtain fumed silica. In addition, refractory silicone may contain platinum Pt as a catalyst.

[0063] When the refractory silicone material is exposed to flame or high heat, silicon dioxide (SiO2) cross-links together, and the silicone polymer decomposes 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 flame or placed in a high temperature environment.

[0064] The glass fiber tape 400 may include a substrate layer containing glass fibers and an adhesive layer formed on one surface of the substrate layer. The substrate layer may be a woven 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 400 may be a rectangular tape having a long side 400L and a short side 400S. That is, the long side 400L here refers to the relatively long side of the rectangular tape, and the short side 400S refers to the relatively short side of the rectangular tape. Such a glass fiber tape 400 may surround the fire-resistant silicone layer 300 along the long side 400L of the glass fiber tape 400. Specifically, the glass fiber tape 400 may be wound around the fire-resistant silicone layer 300 multiple times along the longitudinal direction Ld of the busbar 200, thereby forming overlapping layers 410 and 420 in at least some regions. Here, the layers 410 and 420 of the glass fiber tape 400 correspond to a sandwich structure formed by overlapping at least some regions of the portions of the glass fiber tapes 400 adjacent to each other. More specifically, the glass fiber tape 400 may be obliquely wound around the fire-resistant silicone layer 300 a plurality of times so that some areas between any one layer 410 of the glass fiber tape 400 and another layer 420 adjacent thereto overlap. Figure 8 , some areas of both end portions of the fire-resistant silicone layer 300 are shown as being exposed without being wrapped with the glass fiber tape 400 , however this is for convenience of explanation, and the entire area of ​​the fire-resistant silicone layer 300 may be wrapped with the glass fiber tape 400 .

[0065] The glass fiber tape 400 can protect the fire-resistant silicone layer 300 from the flame. That is, the glass fiber tape 400 completely surrounds the fire-resistant silicone layer 300 and can temporarily protect the fire-resistant silicone layer 300 from the flame generated inside the battery pack.

[0066] In addition, the glass fiber tape 400 can supplement the structural rigidity of the bus bar 200 and the refractory silicone layer 300 to improve the insulation performance of the bus bar 200. Specifically, when the refractory silicone layer 300 is ceramicized, the insulation performance is maintained but the strength is weakened, so that the refractory silicone layer 300 may be damaged by external force. The glass fiber tape 400 can supplement the rigidity of the refractory silicone layer 300 and prevent the refractory silicone layer 300 from being damaged by external force.

[0067] Meanwhile, a plurality of grooves 300G are formed on the surface of the fire-resistant silicone layer 300 according to the present embodiment. Specifically, the grooves 300G may be formed on the surface of the fire-resistant silicone layer 300 facing the glass fiber tape 400. In addition, the grooves 300G may be configured to be continuous in a specific direction.

[0068] As an embodiment, the groove 300G may include a first groove 300G1 continuous along a first direction d1 and a second groove 300G2 continuous along a second direction d2 perpendicular to the first direction. The first direction d1 may be parallel to the longitudinal direction Ld of the busbar 200. The first groove 300G1 is composed of a plurality of grooves, and the plurality of first grooves 300G1 may be positioned to be spaced apart from each other along the second direction d2. The second groove 300G2 is composed of a plurality of grooves, and the plurality of second grooves 300G2 may be positioned to be spaced apart from each other along the first direction d1. The first groove 300G1 and the second groove 300G2 may form a grid pattern.

[0069] Although not particularly shown, as another embodiment, the first groove 300G1 may also be configured to be continuous and inclined at a certain angle with respect to the longitudinal direction Ld of the bus bar 200 .

[0070] When the bus bar assembly 100 is exposed to flames or reaches high temperatures, gas may be generated from the adhesive layer of the fire-resistant silicone layer 300 and the glass fiber tape 400. The gas generated by the fire-resistant silicone layer 300 and the glass fiber tape 400 may accelerate the internal flame, damage the structural stability of the bus bar assembly 100, and thus adversely affect the insulation performance of the bus bar 200. Specifically, if the generated gas is blocked by the tightly attached glass fiber tape 400 and is not discharged, some parts wrapped around the glass fiber tape 400 may expand, and the glass fiber tape 400 may eventually burst and be damaged. If the glass fiber tape 400 is damaged, the fire-resistant silicone layer 300 may collapse without forming a dense structure, ultimately damaging the mechanical rigidity and electrical insulation of the bus bar assembly 100. In addition, the gas generated by the adhesive layer of the fire-resistant silicone layer 300 and the glass fiber tape 400 may contain carbonized components. If the carbonized components accumulate inside, they have an adverse effect on electrical insulation.

[0071] In the present embodiment, a plurality of grooves 300G are formed on the surface of the fire-resistant silicone layer 300 so that in the event of a flame, the gas generated from the fire-resistant silicone layer 300 or the glass fiber tape 400 can be quickly discharged. A gas discharge path can be formed between the fire-resistant silicone layer 300 and the glass fiber tape 400 through the grooves 300G. That is, the bus bar assembly 100 according to the present embodiment is configured so that the glass fiber tape 400 is wound around the fire-resistant silicone layer 300 multiple times to ensure insulation performance and structural stability. The gas generated in the event of a flame can be easily discharged through the grooves 300G formed in the fire-resistant silicone layer 300. Therefore, the structural stability and insulation performance of the bus bar assembly 100 under high temperature and high temperature environments can be greatly improved.

[0072] In particular, refer to Figure 6 , the gas G1 generated between the fire-resistant silicone layer 300 and the glass fiber tape 400 may be discharged along a path formed by the grooves 300G formed on the surface of the fire-resistant silicone layer 300. Figure 8 , the glass fiber tape 400 may be obliquely wound around the fire-resistant silicone layer 300 for multiple times so that some areas between any one layer 410 of the glass fiber tape 400 and another layer 420 adjacent thereto overlap, as described above. At this time, the gas (G2) generated between one layer 410 and another layer 420 in the glass fiber tape 400 may be discharged through the path between one layer 410 and another layer 420. That is, the gas generated in the event of a fire may be discharged to the outside of the bus bar assembly 100 through two paths.

[0073] At the same time, refer again Figure 7 , the depth D of the plurality of grooves (300G) formed in the fire-resistant silicone layer 300 may be 5% to 55% of the thickness T of the fire-resistant silicone layer 300. If the depth D of the plurality of grooves 300G is less than 5% of the thickness T of the fire-resistant silicone layer 300, the depth D of the grooves 300G is too shallow, which makes it difficult to smoothly discharge the gas generated between the fire-resistant silicone layer 300 and the glass fiber tape 400. In addition, if the depth D of the plurality of grooves 300G is greater than 55% of the thickness T of the fire-resistant silicone layer 300, the preparation process of forming the plurality of grooves 300G may be problematic, and the fire resistance or insulation performance of the fire-resistant silicone layer 300 may be deteriorated.

[0074] As an example, the fire-resistant silicone layer 300 according to the present embodiment may have a thickness T of 1.5 mm or more and 3.5 mm or less in consideration of moldability and voltage resistance. In consideration of the degree of gas emission, the preparation process, etc., the depth D of the plurality of grooves 300G may be formed to be 0.2 mm or more and 0.8 mm or less. Meanwhile, the number or width W of the plurality of grooves 300G may vary according to the width or thickness of the bus bar 200. For example, the width W of the plurality of grooves 300G may be 0.5 mm or more and 1.5 mm or less.

[0075] 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.

[0076] 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.

[0077] 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 to ESS (energy storage system), and can be applied to various devices that can use secondary batteries, without limitation.

[0078] Although the present invention has been described in detail with reference to the preferred embodiments of the present invention, 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 concept of the present disclosure, which is defined by the appended claims and also falls within the scope of the present disclosure.

[0079] [Explanation of Reference Numerals]

[0080] 100: Busbar assembly

[0081] 200: Busbar

[0082] 300: Fire-resistant silicone layer

[0083] 300G: Grooved

[0084] 300G1: First groove

[0085] 300G2: Second groove

[0086] 400: Fiberglass tape

[0087] 1000: Battery Pack

[0088] 1100: Battery Pack Frame

[0089] 1200: Battery module

[0090] 1300: BDU module

[0091] 1400: BMS module

Claims

1. A bus bar assembly, comprising: A bus bar used to guide electrical connections inside the battery pack; a fire-resistant silicone layer surrounding an outer peripheral surface of the bus bar; as well as a fiberglass tape surrounding the fire-resistant silicone layer, Wherein, a plurality of grooves are formed on the surface of the fire-resistant silicone layer.

2. The bus bar assembly according to claim 1, wherein: The grooves are formed on a surface of the fire-resistant silicone layer that faces the glass fiber tape.

3. The bus bar assembly according to claim 1, wherein: A gas exhaust path is formed between the fire-resistant silicone layer and the glass fiber tape through the groove.

4. The bus bar assembly according to claim 1, wherein: The groove is configured to be continuous along a certain direction.

5. The bus bar assembly according to claim 1, wherein: The groove includes a first groove continuous along a first direction and a second groove continuous along a second direction perpendicular to the first direction.

6. The bus bar assembly according to claim 5, wherein: The first direction is parallel to a longitudinal direction of the bus bar.

7. The bus bar assembly according to claim 1, wherein: The glass fiber tape is wound around the fire-resistant silicone layer multiple times along the longitudinal direction of the bus bar to form overlapping layers in at least some areas.

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 some areas between any one layer of the glass fiber tape and another layer adjacent thereto overlap.

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, 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 is used to control 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 battery modules, the battery module and the BDU module, the battery module and the BMS module, or the BDU module and the BMS module.

Images