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; a fire-resistant silicone layer surrounding an outer peripheral surface of the bus bar; the glass fiber tape wraps the fire-resistant silicone layer, and the glass fiber tape is provided with a plurality of through holes.

Description

Technical Field

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the priority of Korean Patent Application No. 10-2023-0011440 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 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 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, 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 disclosure, a bus bar assembly is provided, comprising: a bus bar for guiding electrical connections inside a battery pack; a fire-resistant silicone layer surrounding the outer peripheral surface of the bus bar; and a glass fiber tape surrounding the fire-resistant silicone layer, wherein the glass fiber tape is formed with a plurality of through holes.

[0020] The glass fiber tape may be wound multiple times along the longitudinal direction of the bus bar to form layers with at least partial regions overlapping each other.

[0021] The glass fiber tape may be obliquely wound around the fire-resistant silicone layer a plurality of times so that partial regions between any one layer of the glass fiber tape and another layer adjacent thereto overlap each other.

[0022] At least one of the through holes formed in any one layer of the glass fiber tape may be configured such that an opening portion thereof at least partially overlaps at least one of the through holes formed in another adjacent layer of the glass fiber tape.

[0023] The fiberglass tape may be a rectangular tape having a long side and a short side, and the fiberglass tape may wrap around the fire-resistant silicone layer along the long side of the fiberglass tape.

[0024] The through holes may include vertical through holes and horizontal through holes. The vertical through holes are formed to extend in a direction parallel to the long sides of the glass fiber tape, and the horizontal through holes are formed to extend in a direction parallel to the short sides of the glass fiber tape.

[0025] Both the vertical through-hole and the horizontal through-hole may be configured in plural, and each of the vertical through-hole and the horizontal through-hole is arranged along the long side of the glass fiber tape.

[0026] The glass fiber tape may be wound multiple times along the longitudinal direction of the busbar to form layers overlapping in at least a partial area, and at least one of the vertical through holes formed in any one layer of the glass fiber tape and at least one of the horizontal through holes formed in another adjacent layer of the glass fiber tape may be configured so that opening portions thereof at least partially overlap with each other.

[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, the battery pack comprising: at least one bus bar assembly as described above; a battery module; a BDU (battery disconnect unit) module, which is an electrical connection of the battery module; and a BMS (battery management system) module, which 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.

[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] Furthermore, the glass fiber tape is formed with a plurality of through holes 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 bus bar and a fire-resistant silicone layer included 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 a section taken along the cutting line BB'.

[0040] Figure 8 is a plan view showing a glass fiber tape according to an embodiment of the present disclosure.

[0041] Fig. 9 and Fig.10 It is shown Figure 8 Fireproof fiber tape around Figure 6 A plan view of a bus bar assembly in a wound state.

[0042] Fig.11 is a plan view showing a glass fiber tape according to a modified embodiment of the present disclosure.

[0043] Fig.12 and Fig.13 It is shown Fig.11 Fireproof fiber tape around Figure 6 A plan view of a bus bar assembly in a wound state. 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 the embodiments. The present disclosure can be modified in various different ways and is not limited to the embodiments set forth herein.

[0045] 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.

[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 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.

[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 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.

[0048] 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.

[0049] 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.

[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, 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.

[0052] 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.

[0053] 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.

[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 applied.

[0055] 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.

[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 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 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 4 As 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.

[0058] 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.

[0059] 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.

[0060] Next, we will refer to Figures 6 to 10 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 fire-resistant silicone layer included 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 a cross section taken along the cutting line BB'.

[0062] Reference Figure 6 and Figure 7The bus bar assembly 100 according to an embodiment of the present disclosure includes: a bus bar 200 for guiding electrical connection inside 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 surrounding the fire-resistant silicone layer 300 .

[0063] 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.

[0064] 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 5 ) The fire-resistant silicone layer 300 having electrical insulating properties is used 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] Refractory silicone material is a material that is exposed to flame or ceramicized when exposed to flame or high temperature, which is different from ordinary silicone material that burns when exposed to flame or at high temperature. Refractory silicone material can be a silicon material that is ceramicized when the temperature exceeds a certain temperature. Refractory silicone material can include silicone polymer and silicon dioxide. The silicone polymer used can be a polysilicone-based compound with 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 (SiCl4) compound can use metallic silicon as the main raw material, produced by reaction with hydrochloric acid and purification process, and this 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.

[0066] 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.

[0067] Figure 8 is a plan view showing a glass fiber tape according to an embodiment of the present disclosure. Fig. 9 and Fig.10 It is shown Figure 8 Fireproof fiber tape around Figure 6A plan view of a busbar assembly wound in a state. Specifically, Fig. 9 The state before the last portion of the glass fiber tape 400a is wrapped around the fire-resistant silicone layer 300 is shown. Fig.10 A state in which the last portion of the glass fiber tape 400 a is completely wound around the fire-resistant silicone layer 300 is shown.

[0068] Reference Figure 6 , Figure 8 , Fig. 9 and Fig.10 The bus bar assembly 100 according to the present embodiment includes a glass fiber tape 400 a surrounding a fire-resistant silicone layer 300 , wherein the glass fiber tape 300 a is formed with a plurality of through holes 400H. The glass fiber tape 400 a may surround an outer surface of the fire-resistant silicone layer 300 .

[0069] The glass fiber tape 400a may include a glass fiber layer and an adhesive layer formed on one surface of the glass fiber layer. The glass fiber 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 400a 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 400a may surround the fire-resistant silicone layer 300 along the long side 400L of the glass fiber tape 400a. Specifically, the glass fiber tape 400a may be wound around the fire-resistant silicone layer 300 along the longitudinal direction Ld of the busbar 200 for multiple times to form layers 410 and 420 overlapping at least in part. Here, the layers 410 and 420 of the glass fiber tape 400a correspond to an interlayer structure formed by overlapping at least in part of the adjacent portions of the glass fiber tape 300a. More specifically, the glass fiber tape 400a may be obliquely wound around the fire-resistant silicone layer 300 for multiple times so that a portion of a region between any one layer 410 of the glass fiber tape 300a and another layer 420 adjacent thereto overlaps with each other. Fig. 9 and Fig.10 , partial areas of both end portions of the fire-resistant silicone layer 300 are shown as being exposed without being wound around the glass fiber tape 400a, 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 300a.

[0070] The glass fiber tape 400a can protect the fire-resistant silicone layer 300 from the flame. That is, the glass fiber tape 400a 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.

[0071] In addition, the glass fiber tape 400a 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 in a flame or high temperature environment, the electrical insulation of the fire-resistant silicone layer 300 can be maintained, but the strength of the fire-resistant silicone layer 300 will be weakened, and it may be broken by external force. The glass fiber tape 400a can supplement the rigidity of the fire-resistant silicone layer 300 and prevent the fire-resistant silicone layer 300 from being broken by external force.

[0072] Meanwhile, when the busbar 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 400a. The gas generated from the fire-resistant silicone layer 300 and the glass fiber tape 400a may accelerate the internal flame, damage the structural stability of the busbar assembly 100, and thus adversely affect the insulation performance of the busbar 200. Specifically, if the generated gas is blocked by the tightly attached glass fiber tape 400a and is not discharged, some parts wrapped around the glass fiber tape 300a may expand, and the glass fiber tape 400a may eventually burst and be damaged. If the glass fiber tape 400a is damaged, the fire-resistant silicone layer 300 may also collapse without forming a dense structure, ultimately damaging the mechanical rigidity and electrical insulation performance of the busbar assembly 100. In addition, the gas generated from the adhesive layer of the fire-resistant silicone layer 300 and the glass fiber tape 400a may contain carbonized components. However, if the carbonized components accumulate inside, they will have an adverse effect on electrical insulation.

[0073] Since the glass fiber tape 400a according to the present embodiment is formed with a plurality of through holes 400H, the gas generated in the fire-resistant silicone layer 300 or the adhesive layer of the glass fiber tape 400a can be effectively discharged. The bus bar assembly 100 according to the present embodiment has a structure in which the glass fiber tape 400a is wound around the fire-resistant silicone layer 300 multiple times to ensure insulation and structural stability, and the gas generated in the event of a fire can be easily discharged through the plurality of through holes 400H in the fire-resistant silicone layer 300.

[0074] At least one of the through holes 400H1 formed in any one layer 410 of the glass fiber tape 400a may be configured such that an opening portion thereof at least partially overlaps at least one of the through holes 400H2 formed in another adjacent layer 420 of the glass fiber tape 400a. Fig. 9 and Fig.10 Layers 410 and 420 are shown overlapping in at least partial areas. Fig. 9 A state is shown before a partial region between any one layer 410 and another layer 420 adjacent thereto overlaps with each other. Fig.10The state after a partial area between any one layer 410 and another layer 420 adjacent thereto overlaps each other is shown. When the glass fiber tape 400a surrounds the fire-resistant silicone layer 300, the through holes 400H1 and 400H2 of the adjacent layers 410 and 420 overlap each other, so that the gas generated inside can be discharged more quickly. The number or density of the through holes 400H formed in the glass fiber tape 400a must be designed in consideration of such a gas discharge path.

[0075] Meanwhile, by adjusting the position of the through hole 400H when the glass fiber tape 400a is wound around the fire-resistant silicone layer 300, the degree of overlap between the overlapping layers 410 and 420 of the glass fiber tape 400a can be confirmed. In other words, in addition to exhausting gas, the through hole 400H can also be used as an indicator that can confirm the degree of overlap of the glass fiber tape 400a. As an example, when the glass fiber tape 400a is wound so that the through hole 400H located at the center of the glass fiber tape 300a cannot be seen, the overlapping layers 410 and 420 can be wound so that they overlap by about 50%.

[0076] Next, we will refer to Figures 11 to 13 A bus bar assembly according to a modified embodiment of the present disclosure is described in detail.

[0077] Fig.11 is a plan view showing a glass fiber tape according to a modified embodiment of the present disclosure. Fig.12 and Fig.13 It is shown Fig.11 Fireproof fiber tape around Figure 6 A plan view of a busbar assembly wound in a state. Specifically, Fig.12 The state before the last portion of the glass fiber tape 400b is wrapped around the fire-resistant silicone layer 300 is shown. Fig.13 A state in which the last portion of the glass fiber tape 400 b is completely wound around the fire-resistant silicone layer 300 is shown.

[0078] Refer to Figure 6 , Fig.11 , Fig.12 and Fig.13 , the bus bar assembly 100 according to an embodiment of the present disclosure includes: a bus bar 200 for guiding electrical connection inside 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 400b surrounding the fire-resistant silicone layer 300. Details about the bus bar 200 and the fire-resistant silicone layer 300 are omitted because they overlap with the previously described contents.

[0079] Similar to the above-mentioned glass fiber tape 400a, the glass fiber tape 400b according to the present embodiment may be a rectangular tape having long sides 400L and short sides 400S, and may be formed with a plurality of through holes 400H. However, the glass fiber tape 400b according to the present embodiment is different from the above-mentioned glass fiber tape 400a in terms of the shape and arrangement of the through holes 400H.

[0080] The through hole 400H according to the present embodiment may include a vertical through hole 400Ha formed to extend in a direction parallel to the long side 400L of the glass fiber tape 400b and a horizontal through hole 400Hb formed to extend in a direction parallel to the short side 400S of the glass fiber tape 400b. The vertical through hole 400Ha is a hole having a shape in which the width in the direction parallel to the long side 400L of the glass fiber tape 400b is wider than the width in the direction parallel to the short side 400S of the glass fiber tape 400b. The horizontal through hole 400Hb is a hole having a shape in which the width in the direction parallel to the short side 400S of the glass fiber tape 400b is wider than the width in the direction parallel to the long side 400L of the glass fiber tape 400b.

[0081] The vertical through holes 400Ha and the horizontal through holes 400Hb may be configured in plural, wherein each of the vertical through holes 400Ha and the horizontal through holes 400Hb may be arranged along the long side 400L of the glass fiber tape 400b. Fig.11 As shown, vertical through holes 400Ha may be arranged in two rows along the long side 400L of the glass fiber tape 400b, and horizontal through holes 400Hb may be arranged in one row along the long side 400L of the glass fiber tape 400b. The number and width of each of the vertical through holes 400Ha and the horizontal through holes 400Hb may vary according to the design.

[0082] The glass fiber tape 400b may be wound around the fire-resistant silicone layer 300 multiple times along the longitudinal direction Ld of the busbar to form layers 410 and 420 that overlap at least partially. At this time, at least one vertical through hole 400Ha formed in any one layer 410 of the glass fiber tape 400b and at least another horizontal through hole 400Hb formed in another adjacent layer 420 of the glass fiber tape 400b may overlap at least partially with each other in their opening portions. Fig.12 and Fig.13 Layers 410 and 420 are shown overlapping in at least partial areas. Fig.12 4 shows a state before a partial region between any one layer 410 and another layer 420 adjacent thereto overlaps with each other, Fig.13The state after partial regions between any one layer 410 and another layer 420 adjacent thereto overlap each other is shown. When the glass fiber tape 400b surrounds the fire-resistant silicone layer 300, the vertical through holes 400Ha of any one layer 410 and the horizontal through holes 400Hb of another layer 420 may overlap each other.

[0083] In particular, in the case of the present embodiment, since the vertical through holes 400Ha and the horizontal through holes 400Hb having a wider width in any one direction are formed in the glass fiber tape 400b, it is easy to overlap the vertical through holes 400Ha and the horizontal through holes 400Hb between the adjacent layers 410 and 420, and the overlapping area between the vertical through holes 400Ha and the horizontal through holes 400Hb can be formed wider. Therefore, the gas can be discharged from the inside of the glass fiber tape 400b to the outside more quickly.

[0084] Meanwhile, by adjusting the position of the through hole 400H when the glass fiber tape 400b is wrapped around the fire-resistant silicone layer 300, the degree of overlap between the overlapping layers 410 and 420 of the glass fiber tape 400b can be confirmed. In other words, in addition to exhausting gas, the through hole 400H can also be used as an indicator that can confirm the degree of overlap of the glass fiber tape 400b. As an example, when the glass fiber tape 400b is wound so that the vertical through hole 400Ha located at the center of the glass fiber tape 400b cannot be seen, the overlapping layers 410 and 420 can be wound so that they overlap by about 50%.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] Description of Reference Numerals

[0090] 100: Busbar assembly

[0091] 200: Busbar

[0092] 300: Fire-resistant silicone layer

[0093] 400a, 400b: Glass fiber tape

[0094] 400H, 400H1, 400H2: Through hole

[0095] 400Ha: Vertical through hole

[0096] 400Hb: Horizontal through hole

[0097] 1000: Battery Pack

[0098] 1100: Battery Pack Frame

[0099] 1200: Battery module

[0100] 1300: BDU module

[0101] 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, the glass fiber tape is formed with a plurality of through holes.

2. The bus bar assembly according to claim 1, wherein: The glass fiber tape is wound multiple times along the longitudinal direction of the bus bar to form layers with at least partial regions overlapping each other.

3. The bus bar assembly according to claim 2, wherein: The glass fiber tape is obliquely wound a plurality of times around the fire-resistant silicone layer so that a partial area between any one layer of the glass fiber tape and another layer adjacent to the any one layer overlaps each other.

4. The bus bar assembly according to claim 2, wherein: At least one of the through holes formed in any one layer of the glass fiber tape is configured such that an opening portion thereof at least partially overlaps at least one of the through holes formed in another adjacent layer of the glass fiber tape.

5. 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.

6. The bus bar assembly according to claim 5, wherein: The through holes include a vertical through hole formed to extend in a direction parallel to the long side of the glass fiber tape and a horizontal through hole formed to extend in a direction parallel to the short side of the glass fiber tape.

7. The bus bar assembly according to claim 6, wherein: The vertical through holes and the horizontal through holes are both configured in plural numbers, and Each of the vertical through-holes and the horizontal through-holes is arranged along the long side of the glass fiber tape.

8. The bus bar assembly according to claim 6, wherein: The glass fiber tape is wound multiple times along the longitudinal direction of the bus bar to form layers with at least partial regions overlapping each other, and At least one of the vertical through holes formed in any one layer of the glass fiber tape and at least one of the horizontal through holes formed in another adjacent layer of the glass fiber tape are arranged so that opening portions of the at least one vertical through hole and the at least one horizontal through hole at least partially overlap each other.

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, 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.

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