Bus bar assembly and battery pack including the same

Abstract

A bus bar assembly according to an embodiment of the present invention includes a bus bar for guiding electrical connection inside a battery pack; a refractory silicon layer covering an outer peripheral surface of the bus bar; and a glass fiber tape covering the refractory silicon layer, wherein a plurality of through holes are formed in the glass fiber tape.

Description

Technical Field

[0001] [Cross - Reference to Related Applications] This application claims the benefit of priority based on Korean Patent Application No. 10 - 2023 - 0011440, filed on January 30, 2023, and all the contents disclosed in the documents of the Korean patent application are incorporated herein by reference in their entirety.

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

Background Art

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

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

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

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

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

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

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

[0010] Referring to FIGS. 1 and 2, a conventional bus bar 20 is a rod-shaped metal member extending along the length direction, and holes for connection 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 a configuration responsible for HV (High voltage) connection in a battery pack. The HV connection means the connection of a power source for supplying power, and the bus bar 20 is a configuration for guiding the electrical connection of the battery module, and generally includes a metal material with excellent electrical conductivity. As an example, the bus bar 20 can include a copper (Cu) material.

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

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

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

Summary of the Invention

Problems to be Solved by the Invention

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

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

Means for Solving the Problem

[0016] A bus bar assembly according to an embodiment of the present invention includes a bus bar for guiding electrical connection inside a battery pack; a refractory silicon layer that wraps around the outer peripheral surface of the bus bar; and a glass fiber tape that wraps around the refractory silicon layer, and a plurality of through holes are formed in the glass fiber tape.

[0017] The glass fiber tape can be wound around the bus bar a plurality of times along the length direction of the bus bar so as to form layers in which at least some regions overlap.

[0018] The glass fiber tape can be wound around the refractory silicon layer a plurality of times obliquely so that a part of a region between any one layer of the glass fiber tape and another adjacent layer overlaps.

[0019] At least one of the through holes formed in any one layer of the glass fiber tape can at least partially overlap with at least one of the through holes formed in another adjacent layer of the glass fiber tape in an opened portion.

[0020] The glass fiber tape may be a rectangular tape having a long side and a short side, and the glass fiber tape can wrap around the refractory silicon layer along the long side of the glass fiber tape.

[0021] The through holes can include vertical through holes extending along a direction parallel to the long side of the glass fiber tape and horizontal through holes extending along a direction parallel to the short side of the glass fiber tape.

[0022] All of the vertical through holes and the horizontal through holes can be composed of a plurality, and each of the vertical through holes and the horizontal through holes can be arranged along the long side of the glass fiber tape.

[0023] The glass fiber tape can be wound a plurality of times along the length direction of the bus bar so as to form layers in which at least some regions overlap. At least one of the vertical through holes formed in any 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 can have at least a part of the opened portions overlapping each other.

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

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

Effects of the Invention

[0026] According to an embodiment of the present invention, a refractory silicon layer that is ceramified by high heat or flame and a glass fiber tape that wraps such a refractory silicon layer are provided in the bus bar assembly, so that even if a flame occurs inside the battery pack, the electrical insulation of the bus bar assembly can be maintained.

[0027] In addition, a plurality of through holes are formed in the glass fiber tape, and the gas generated when the bus bar assembly is exposed to the flame can be quickly discharged.

[0028] The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

Brief Description of the Drawings

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Mode for Carrying Out the Invention

[0030] Hereinafter, with reference to the accompanying drawings, various embodiments of the present invention will be described in detail so that those having ordinary knowledge in the technical field to which the present invention pertains can easily implement them. The present invention can be implemented in several different forms and is not limited to the embodiments described herein.

[0031] To clearly explain the present invention, parts not related to the explanation are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.

[0032] In addition, the sizes and thicknesses of the respective configurations shown in the drawings are arbitrarily shown for convenience of explanation, so the present invention is not necessarily limited to those shown in the drawings. In the drawings, the thickness is enlarged to clearly represent a plurality of layers and regions. And in the drawings, for convenience of explanation, the thicknesses of some layers and regions are exaggerated.

[0033] Also, when a part such as a layer, film, region, or plate is "on" or "above" another part, this includes not only the case where it is directly above the other part but also the case where there is another part in between. Conversely, when a part is said to be "directly above" another part, it means that there is no other part in the middle. Also, being "on" or "above" a reference part means being located above or below the reference part, and does not necessarily mean being located "on" or "above" in the direction opposite to gravity.

[0034] Also, throughout the specification, when a part "includes" a certain component, it means that other components can be further included, rather than excluding other components, unless otherwise stated to the contrary.

[0035] Also, throughout the specification, "on a plane" means when the target part is viewed from above, and "in a cross-section" means when the cross-section obtained by vertically cutting the target part is viewed from the side.

[0036] FIG. 3 is a plan view showing a battery pack according to an embodiment of the present invention.

[0037] Referring to FIG. 3, a battery pack 1000 according to an embodiment of the present invention 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 this embodiment electrically connects at least one of between the battery modules 1200, between the battery module 1200 and the BDU module 130, between the battery module 1200 and the BMS module 1400, or between the BDU module 1300 and the BMS module 1400. Specifically, a plurality of battery modules 1200 can be housed in a pack frame 1100, and the electrical connection between the battery modules 1200 and the electrical connection between the battery module 1200 and the BDU module 1300 can be performed by the bus bar assembly 100. That is, the bus bar assembly 100 according to this embodiment can be responsible for HV (High voltage) connection. Here, the HV connection is a connection serving as a power source for supplying power that requires a high voltage, and means a connection between battery cells or between battery modules.

[0038] On the one hand, the BDU module 1300 is a member for controlling the electrical connection of the battery module 1200, and can cut off the power supply between the power conversion device and the battery module 1200. When a condition occurs where the current exceeds the set range, the BDU module 1300 can cut off the power supply of the battery pack 1000 to ensure the safety of the battery pack 1000.

[0039] On the other hand, the LV connection member 100' according to this embodiment can be responsible for the electrical connection between the battery module 1200 and the BMS module 1400. The electrical connection here is an LV (Low voltage) connection, which means a sensing connection for sensing and controlling the voltage and temperature of the battery module 1200. Specifically, sensors inside the battery module 1200 are arranged, and the real-time temperature information and voltage information of the battery module 1200 are transmitted to the BMS module 1400 via the LV connection member 100'. The real-time operating state of the battery module 1200 can be monitored and controlled through the BMS module 1400. Specifically, although not shown in the figure, an HV current sensor may be integrated into the BMS module 1400. In this case, the busbar assembly according to this embodiment can be responsible for the electrical connection between the battery module 1200 and the BMS module 1400 or between the BDU module 1300 and the BMS module 1400.

[0040] Hereinafter, with reference to FIGS. 4 and 5, the battery module 1200 according to this embodiment will be described. However, the battery module 1200 described below is an exemplary structure of a battery module including a plurality of battery cells 11, and various forms of battery modules including a plurality of battery cells can be applied.

[0041] FIG. 4 is a perspective view showing one of the battery modules included in the battery pack of FIG. 3. FIG. 5 is a partial perspective view showing the state where the module frame and the end plate are removed from the battery module of FIG. 4.

[0042] Referring to FIGS. 4 and 5, the battery module 1200 according to this embodiment can include a battery cell stack 11A in which a plurality of battery cells 11 are stacked. The battery cell stack 11A is shown in FIG. 5. Such a battery cell stack 11A can be housed in the module frame 30 and the end plate 40.

[0043] The battery cell 11 may be a pouch-type battery cell. Such a pouch-type battery cell can be formed by housing an electrode assembly in a pouch case of a laminate sheet including a resin layer and a metal layer, and then fusing the outer peripheral portion of the pouch case. Such a battery cell 11 can be formed in a rectangular sheet structure. The electrode lead 11L connected to the electrode assembly projects outside the pouch case, and the electrode leads 11L of each battery cell 11 can be electrically connected to each other via a lead bus bar 21. On the other hand, at least one electrode lead 11L can be connected to a terminal bus bar 22. A part of the terminal bus bar 22 can be exposed outside the battery module 1200 as shown in FIG. 4. The lead bus bar 21 and the terminal bus bar 22 can all include a metal material excellent in electrical conductivity.

[0044] The bus bar assembly 100 according to this embodiment is electrically connected to such a terminal bus bar 22, and the above-described HV connection can be performed. That is, the battery module 1200 can be electrically connected to another battery module 1200, the BDU module 1300, or the BMS module 1400 via the bus bar assembly 100 connected to the terminal bus bar 22.

[0045] As described above, the battery cells and battery modules described with reference to FIGS. 4 and 5 have exemplary structures, and there are no special restrictions on the types and 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. That is, although the pouch-type battery cell has been exemplarily described, the prismatic battery cell and the cylindrical battery cell can also be applied to the battery module according to the embodiment of the present invention. In addition, although the battery module in which the battery cell is housed in the module frame has been exemplarily described, the CTP (cell to pack) type battery module in which a large number of battery cells are mounted on the battery pack without being housed in the module frame is also applicable as an example of the present invention.

[0046] Hereinafter, with reference to FIGS. 6 to 10, the bus bar assembly according to an embodiment of the present invention will be described in detail.

[0047] FIG. 6 is a plan view showing a bus bar and a refractory silicon layer included in a bus bar assembly according to an embodiment of the present invention. FIG. 7 is a cross-sectional view showing a cross-section cut along the cutting line B-B' of FIG. 6.

[0048] Referring to FIGS. 6 and 7, a bus bar assembly 100 according to an embodiment of the present invention includes a bus bar 200 for guiding electrical connection inside the battery pack 1000; a refractory silicon layer 300 covering the outer peripheral surface of the bus bar 200; and a glass fiber tape covering the refractory silicon layer 300.

[0049] The bus bar 200 is configured to guide the electrical connection of the battery module, that is, the HV connection, and can include a metal material having excellent electrical conductivity. As an example, the bus bar 200 can include a copper (Cu) material. The bus bar 200 may be a metal bar extending along the length direction (Ld).

[0050] The refractory silicon layer 300 can include a refractory silicon material. Specifically, the refractory silicon layer 300 can be formed by molding the refractory silicon material on the outer peripheral surface of the bus bar 200. Such a refractory silicon layer 300 can wrap the outer peripheral surface of the bus bar 200 except for a partial region at both ends of the bus bar 200 that is connected to the terminal bus bar 22 (see FIG. 5). The refractory silicon layer 300 having electrical insulation functions as an insulating layer for protecting the bus bar 200 and prevents the bus bar 200 from coming into contact with other electrical components or conductive members and causing a short circuit.

[0051] Unlike general silicon materials that are exposed to flames or burn at high temperatures, the refractory silicon material is a material that becomes ceramified when exposed to flames or high heat. The refractory silicon material may be a silicon material that becomes ceramified at a certain temperature or higher. The refractory silicon material can include a silicon polymer and silica. The applied silicon polymer can be a polysiloxane-based compound having a vinyl group as a functional group and corresponds to the base material of the refractory silicon material. The silica may be fumed silica as a reinforcing filler contained in the silicon polymer. High-purity silicon chloride (SiCl4) compounds can be produced using metallic silicon as the main raw material through reactions with hydrochloric acid and purification processes, and fumed silica can be obtained by reacting this with hydrogen and oxygen in a high-temperature flame. Further, the refractory silicon material can include platinum (Pt) as a catalyst.

[0052] When the refractory silicon material is exposed to a flame or high heat, cross-linking of silica (SiO2) occurs along with the decomposition of the silicon polymer, forming a ceramic substance. The refractory silicon layer 300 according to this embodiment will not burn or melt even when exposed to an internal flame or placed in a high-temperature environment, but can be ceramified to maintain electrical insulation.

[0053] FIG. 8 is a plan view showing a glass fiber tape according to an embodiment of the present invention. FIGS. 9 and 10 are plan views showing a state in which the glass fiber tape of FIG. 8 is wound around the bus bar assembly of FIG. 6. Specifically, FIG. 9 shows a state before the last portion of the glass fiber tape 400a is wound around the refractory silicon layer 300, and FIG. 10 shows a state in which the last portion of the glass fiber tape 400a is completely wound around the refractory silicon layer 300.

[0054] Referring to FIGS. 6, 8, 9, and 10, the bus bar assembly 100 according to this embodiment includes a glass fiber tape 400a that wraps around the refractory silicon layer 300, and a plurality of through holes 400H are formed in the glass fiber tape 400a. The glass fiber tape 400a can wrap around the outer surface of the refractory silicon layer 300.

[0055] The glass fiber tape 400a can include a glass fiber layer and an adhesive layer formed on one surface of such a glass fiber base material layer. The glass fiber layer may be a fabric containing glass fibers, and the adhesive layer can 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 in this specification indicates the relatively long side in the rectangular tape, and the short side 400S indicates the relatively short side in the rectangular tape. Such a glass fiber tape 400a can wrap the refractory silicon layer 300 along the long side 400L of the glass fiber tape 400a. Specifically, the glass fiber tape 400a can be wound around the refractory silicon layer 300 a plurality of times along the length direction (Ld) of the bus bar 200 so as to form layers 410 and 420 where at least some regions overlap. Here, the layers 410 and 420 of the glass fiber tape 400a correspond to an interlayer structure formed by overlapping at least some regions of adjacent portions of the glass fiber tape 400a. More specifically, the glass fiber tape 400a can be wound around the refractory silicon layer 300 obliquely a plurality of times so that a part of the region between any one layer 410 of the glass fiber tape 400a and another adjacent layer 420 overlaps. Although FIGS. 9 and 10 show that a part of the regions at both ends of the refractory silicon layer 300 are exposed without being wound by the glass fiber tape 400a, this is for convenience of explanation, and the entire region of the refractory silicon layer 300 can be wrapped by the glass fiber tape 400a.

[0056] The glass fiber tape 400a can protect the refractory silicon layer 300 from the flame. That is, while the glass fiber tape 400a completely wraps the refractory silicon layer 300, the refractory silicon layer 300 can be primarily protected from the flame generated inside the battery pack.

[0057] In addition, the glass fiber tape 400a can complement the structural rigidity of the bus bar 200 and the refractory silicon layer 300, thereby improving the insulation performance against the bus bar 200. Specifically, in an environment of flame or high heat, when the refractory silicon layer 300 is ceramized, the electrical insulation of the refractory silicon layer 300 can be maintained, but the strength of the refractory silicon layer 300 becomes weak and it may be damaged by external force. The glass fiber tape 400a can complement the rigidity of such a refractory silicon layer 300 and prevent the refractory silicon layer 300 from being damaged by external force.

[0058] On the other hand, when the bus bar assembly 100 is exposed to a flame or becomes hot, gas may be generated from the adhesive layer between the refractory silicon layer 300 and the glass fiber tape 400a. The gas generated from the refractory silicon layer 300 and the glass fiber tape 400a may accelerate the internal flame, inhibit the structural stability of the bus bar assembly 100, and adversely affect the insulation performance against the bus bar 200. Specifically, if the generated gas clogs the closely attached glass fiber tape 400a and is not discharged, a part of the portion wound around the glass fiber tape 400a may bulge, and eventually the glass fiber tape 400a may rupture and be damaged. When the glass fiber tape 400a is damaged, the refractory silicon layer 300 also collapses without being able to form a dense structure, and ultimately the mechanical rigidity and electrical insulation of the bus bar assembly 100 are inhibited. In addition, the gas generated from the adhesive layer between the refractory silicon layer 300 and the glass fiber tape 400a may contain carbonized components, and when the carbonized components are accumulated internally, it will have an adverse effect on the electrical insulation.

[0059] Since a plurality of through holes 400H are formed in the glass fiber tape 400a according to the present embodiment, the gas generated from the adhesive layer of the refractory silicon layer 300 or the glass fiber tape 400a can be effectively discharged. The bus bar assembly 100 according to the present embodiment is in a form in which the glass fiber tape 400a is wound around the refractory silicon layer 300 a plurality of times in order to ensure insulation and structural stability. However, the gas generated from the flame situation can be easily discharged through the plurality of through holes 400H in the refractory silicon layer 300.

[0060] Further, at least one of the through-holes 400H1 formed in any layer 410 of the glass fiber tape 400a can have at least a part of the opened portion overlapping with at least one of the through-holes 400H2 formed in another adjacent layer 420 of the glass fiber tape 400a. FIGS. 9 and 10 show the layers 410 and 420 where at least a part of the regions overlap. FIG. 9 shows the state before a part of the region between one layer 410 and another adjacent layer 420 overlaps, and FIG. 10 shows the state after a part of the region between one layer 410 and another adjacent layer 420 overlaps. When the glass fiber tape 400a wraps the refractory silicon layer 300, the through-holes 400H1 and 400H2 of the adjacent layers 410 and 420 overlap each other in this way, and the gas generated inside can be discharged more quickly. The number and density of the through-holes 400H formed in the glass fiber tape 400a must be designed in consideration of such a gas discharge path.

[0061] On the other hand, by adjusting the position of the through-hole 400H when the glass fiber tape 400a wraps the refractory silicon layer 300, the overlapping condition between the overlapping layers 410 and 420 of the glass fiber tape 400a can be confirmed. That is, in addition to discharging gas, the through-hole 400H can function as an index for confirming 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 400a is not visible, it can be wound so that the overlapping layers 410 and 420 overlap by about 50%.

[0062] Hereinafter, with reference to FIGS. 11 to 13, a bus bar assembly according to a modified embodiment of the present invention will be described in detail.

[0063] FIG. 11 is a plan view showing a glass fiber tape according to a modified embodiment of the present invention. FIGS. 12 and 13 are plan views showing a state in which the glass fiber tape of FIG. 11 is wound around the bus bar assembly of FIG. 6. Specifically, FIG. 12 shows a state before the last part of the glass fiber tape 400b is wound around the refractory silicon layer 300, and FIG. 13 shows a state in which the last part of the glass fiber tape 400b is completely wound around the refractory silicon layer 300.

[0064] Referring to FIGS. 6, 11, 12, and 13 together, a bus bar assembly 100 according to an embodiment of the present invention includes a bus bar 200 for guiding electrical connection inside the battery pack 1000; a refractory silicon layer 300 that wraps around the outer peripheral surface of the bus bar 200; and a glass fiber tape 400b that wraps around the refractory silicon layer 300. The description of the bus bar 200 and the refractory silicon layer 300 overlaps with the content described above, so it is omitted.

[0065] Similar to the glass fiber tape 400a described above, the glass fiber tape 400b according to this embodiment can be a rectangular tape having a long side 400L and a short side 400S, and a plurality of through holes 400H can be formed. However, the glass fiber tape 400b according to this embodiment is different from the glass fiber tape 400a described above in terms of the shape and arrangement of the through holes 400H.

[0066] The through holes 400H according to this embodiment can include vertical through holes 400Ha extending along a direction parallel to the long side 400L of the glass fiber tape 400b and horizontal through holes 400Hb extending along a direction parallel to the short side 400S of the glass fiber tape 400b. The vertical through hole 400Ha is a hole 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 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.

[0067] The vertical through-holes 400Ha and the horizontal through-holes 400Hb can both be configured in plural, and each of the vertical through-holes 400Ha and the horizontal through-holes 400Hb can be arranged along the long side 400L of the glass fiber tape 400b. As an example, as shown in FIG. 11, the vertical through-holes 400Ha can be arranged in two rows along the long side 400L of the glass fiber tape 400b, and the horizontal through-holes 400Hb can 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 depending on the design.

[0068] The glass fiber tape 400b can be wound around the refractory silicon layer 300 a plurality of times along the length direction (Ld) of the bus bar 200 so as to form layers 410 and 420 in which at least some regions overlap. 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 one horizontal through-hole 400Hb formed in another adjacent layer 420 of the glass fiber tape 400b can have at least a part of the opened portions overlapping each other. FIGS. 12 and 13 show the layers 410 and 420 in which at least some regions overlap. FIG. 12 shows the state before a part of the region between a certain layer 410 and another adjacent layer 420 overlaps, and FIG. 13 shows the state after a part of the region between a certain layer 410 and another adjacent layer 420 overlaps. When the glass fiber tape 400b wraps the refractory silicon layer 300, the vertical through-hole 400Ha of one layer 410 and the horizontal through-hole 400Hb of another layer 420 can overlap each other.

[0069] In particular, in the case of this embodiment, since the vertically penetrating holes 400Ha and the horizontally penetrating holes 400Hb, which are wider in any direction, are formed in the glass fiber tape 400b, it is easy to overlap the penetrating holes 400Ha and 400Hb between the adjacent layers 410 and 420, and the overlapping area between the penetrating holes 400Ha and 400Hb can be made wider. As a result, gas can be discharged more quickly from the inside of the glass fiber tape 400b to the outside.

[0070] On the other hand, by adjusting the position of the penetrating hole 400H when the glass fiber tape 400b wraps around the refractory silicon layer 300, the overlapping condition between the overlapping layers 410 and 420 of the glass fiber tape 400b can be confirmed. That is, in addition to discharging gas, the penetrating hole 400H can function as an index for confirming the degree of overlap of the glass fiber tape 400b. As an example, when the glass fiber tape 400b is wound so that the vertically penetrating hole 400Ha of the glass fiber tape 400b is not visible, it can be wound so that the overlapping layers 410 and 420 overlap by about 50%.

[0071] In this embodiment, terms representing directions such as front, rear, left, right, up, and down are used, but these terms are for convenience of explanation and may vary depending on the position of the object to be observed and the position of the observer.

[0072] One or more battery modules according to the embodiment described above can be mounted together with various control and protection systems such as a BMS (Battery Management System), a BDU (Battery Disconnect Unit), and a cooling system to form a battery pack.

[0073] The battery module and the battery pack can be applied to various devices. Specifically, they can be applied to transportation means such as electric bicycles, electric vehicles, and hybrids, and ESS (Energy Storage System), but are not limited thereto, and can be applied to various devices that can use secondary batteries.

[0074] As described above in detail with respect to the preferred embodiments of the present invention, the scope of the rights of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention defined in the following claims also belong to the scope of the rights of the present invention.

Explanation of Reference Numerals

[0075] 100 bus bar assembly 200 bus bar 300 refractory silicon layer 400a, 400b glass fiber tape 400H, 400H1, 400H2 through holes 400Ha vertical through hole 400Hb horizontal through hole 1000 battery pack 1100 pack frame 1200 battery module 1300 BDU module 1400 BMS module

Claims

1. A bus bar for guiding electrical connection inside a battery pack; A refractory silicon layer wrapping the outer peripheral surface of the bus bar; and A glass fiber tape wrapping the refractory silicon layer; The bus bar assembly includes, A plurality of through holes are formed in the glass fiber tape.

2. The bus bar assembly according to claim 1, wherein the glass fiber tape is wound multiple times along the length direction of the bus bar so that at least some regions form overlapping layers.

3. The bus bar assembly according to claim 2, wherein the glass fiber tape is wound around the refractory silicon layer obliquely multiple times such that some regions overlap between any one layer of the glass fiber tape and another adjacent layer.

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 has at least a partially overlapping opening with at least one of the through holes formed in another adjacent layer of the glass fiber tape.

5. The glass fiber tape is a rectangular tape having a long side and a short side, The bus bar assembly according to claim 1, wherein the glass fiber tape wraps the refractory silicon layer along the long side of the glass fiber tape.

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

7. Both the vertical through holes and the horizontal through holes are composed of a plurality, The bus bar assembly according to claim 6, wherein each of the vertical through holes and the horizontal through holes is arranged along the long side of the glass fiber tape.

8. The glass fiber tape is wound multiple times along the length direction of the bus bar so that at least some regions form overlapping layers, The bus bar assembly according to claim 6, wherein 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 have at least a partially overlapping opening with each other.

9. The busbar assembly according to claim 1, wherein the refractory silicon layer contains a silicon material that is ceramified at high temperature.

10. At least one busbar assembly according to claim 1; A battery module; A BDU (battery disconnect unit) module for controlling the electrical connection of the battery module; and A BMS (Battery Management System) module for monitoring and controlling the operation of the battery module, A battery pack including at least one of the busbar assemblies that electrically connects at least one of between the battery modules, between the battery module and the BDU module, between the battery module and the BMS module, or between the BDU module and the BMS module.

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