Busbar frame assembly and battery module including same

Abstract

A busbar frame assembly according to one embodiment of the present invention comprises: a busbar frame; and at least one busbar disposed on the busbar frame, wherein the at least one busbar includes a first metal layer facing the busbar frame and a second metal layer located on the surface opposite the surface on which the first metal layer faces the busbar frame. The busbar includes a processed surface on which the first metal layer is exposed, and the busbar frame includes a protruding part corresponding to the processed surface.

Description

Busbar frame assembly and battery module including the same

[0001] Cross-citation with related application(s)

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0086187, filed July 1, 2024, the entire contents of which are incorporated herein by reference.

[0003] The present invention relates to a busbar frame assembly and a battery module including the same, and more specifically, to a busbar frame assembly and a battery module including the same, which can reduce the manufacturing cost of a busbar and effectively prevent incorrect assembly of the busbar.

[0004] In modern society, the widespread use of portable devices like cell phones, laptops, camcorders, and digital cameras has fueled active development of technologies related to these devices. Furthermore, rechargeable secondary batteries are increasingly being used as power sources for electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (P-HEVs) to address air pollution caused by conventional gasoline-powered vehicles, further fueling the growing need for secondary battery development.

[0005] Currently commercialized secondary batteries include nickel cadmium batteries, nickel hydrogen batteries, nickel zinc batteries, and lithium secondary batteries. Among these, lithium secondary batteries are receiving attention for their advantages of being able to charge and discharge freely, having a very low self-discharge rate, and having a high energy density, as they have almost no memory effect compared to nickel-based secondary batteries.

[0006] These lithium secondary batteries primarily use lithium oxide and carbon materials as the positive and negative electrode active materials, respectively. The lithium secondary battery comprises an electrode assembly comprising a positive electrode plate and a negative electrode plate, each coated with the positive and negative electrode active materials, with a separator interposed between them, and a battery case that seals and houses the electrode assembly together with an electrolyte.

[0007] In general, lithium secondary batteries can be classified into can-type secondary batteries in which the electrode assembly is built into a metal can and pouch-type secondary batteries in which the electrode assembly is built into a pouch of an aluminum laminate sheet, depending on the shape of the outer packaging material.

[0008] Secondary batteries used in small devices are configured with 2-3 battery cells, but secondary batteries used in medium- to large-sized devices such as automobiles utilize battery modules in which multiple battery cells are electrically connected. These battery modules enhance capacity and output by forming a battery cell stack by connecting multiple battery cells in series or parallel. In addition, one or more battery modules may be mounted together with various control and protection systems, such as a Battery Disconnect Unit (BDU), a Battery Management System (BMS), and a cooling system, to form a battery pack.

[0009] Meanwhile, the battery pack is equipped with a bus bar connected to the battery module. A conventional bus bar is a metal member in the shape of a rod extending along the length direction, and a through hole may be formed at both ends of the bus bar for connection to the terminal bus bar of the battery module. This bus bar is a component that is responsible for the HV (High Voltage) connection in the battery pack. The HV connection refers to a connection that serves as a power source to supply power, and the bus bar is a component that guides the electrical connection of the battery module, and is typically made of a metal material with excellent electrical conductivity. For example, the bus bar may include a copper (Cu) material.

[0010] The problem to be solved by the present invention is to provide a busbar frame assembly and a battery module including the same, which can reduce the manufacturing cost of a busbar and effectively prevent incorrect assembly of the busbar.

[0011] However, the problems to be solved by the embodiments of the present invention are not limited to the problems described above and can be expanded in various ways within the scope of the technical ideas included in the present invention.

[0012] A busbar frame assembly according to one embodiment of the present invention comprises: a busbar frame; and at least one busbar disposed on the busbar frame, wherein at least one busbar includes a first metal layer facing the busbar frame and a second metal layer positioned on an opposite surface of a surface of the first metal layer facing the busbar frame. The busbar includes a machined surface on which the first metal layer is exposed, and the busbar frame includes a protrusion corresponding to the machined surface.

[0013] The above-mentioned processing surface extends to at least one side of the above-mentioned bus bar, so that the side surface of the above-mentioned protrusion can be in contact with the above-mentioned processing surface.

[0014] The above protrusion may be an electrically insulating material.

[0015] The first metal layer may include aluminum (Al).

[0016] The second metal layer may include copper (Cu).

[0017] The above busbars may be provided in multiples.

[0018] One of the above busbars may be positioned such that the machined surface includes the right side of the busbar, and the other of the above busbars may be positioned such that the machined surface includes the left side of the busbar.

[0019] Among the above bus bars, there may be bus bars having the same shape, and in the bus bars having the same shape, the positions of the processing surfaces may be arranged to be symmetrical to each other.

[0020] A battery module according to another embodiment of the present invention comprises: a busbar frame assembly according to the present invention; and a plurality of battery cells including electrode leads connected to at least one of the busbars.

[0021] Among the electrode leads of the battery cell, the positive electrode lead can be connected to the processed surface, and among the electrode leads of the battery cell, the negative electrode lead can be connected to the second metal layer.

[0022] The first metal layer may include aluminum (Al).

[0023] The second metal layer may include copper (Cu).

[0024] According to embodiments of the present invention, a processing surface is provided on the busbar, and a protrusion corresponding to the processing surface of the busbar is provided on the busbar frame. This reduces the manufacturing cost of the busbar and effectively prevents incorrect assembly of the busbar.

[0025] In particular, even when the shape of the busbar is the same, the structure of the protrusion of the busbar frame corresponding to the machined surface of the busbar can prevent the misassembly phenomenon in which the busbar at a specific location is assembled at a different location.

[0026] 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.

[0027] FIG. 1 is an exploded perspective view showing a battery module according to one embodiment of the present invention.

[0028] FIG. 2 is a perspective view showing a busbar frame assembly according to one embodiment of the present invention.

[0029] Figure 3 is a plan view showing the busbar frame assembly of Figure 2.

[0030] Fig. 4 is a plan view showing the busbar frame assembly of Fig. 2 viewed from a different angle than Fig. 3.

[0031] Fig. 5 is an exploded perspective view showing the busbar of the busbar frame assembly of Fig. 2 in an exploded state.

[0032] Figure 6 is a perspective view showing a bus bar according to one embodiment of the present invention.

[0033] Fig. 7 is a plan view showing the bus bar of Fig. 6.

[0034] Figure 8 is an enlarged view showing the enlarged view of part “A” of Figure 5.

[0035] Fig. 9 is a perspective view showing the busbar frame assembly of Fig. 2 with the busbar removed.

[0036] Figure 10 is an enlarged view showing the enlarged view of part “B” of Figure 9.

[0037] Fig. 11 is a perspective view showing the busbar frame assembly of Fig. 2 viewed from a different angle.

[0038] Figure 12 is an enlarged view showing the enlarged view of the “C” portion of Figure 11.

[0039] Fig. 13 is a cross-sectional view showing a cross-section taken along the cutting line D-D' of Fig. 4.

[0040] Figure 14 is an enlarged view showing the enlarged view of the “E” portion of Figure 13.

[0041] Fig. 15 is a cross-sectional view showing a cross-section taken along the cutting line F-F' of Fig. 3.

[0042] Figure 16 is an enlarged view showing the enlarged “G” portion of Figure 15.

[0043] Figure 17 is an exploded perspective view showing a busbar frame assembly according to another embodiment of the present invention.

[0044] Fig. 18 is a cross-sectional view showing a cross-section taken along the cutting line H-H' of Fig. 3.

[0045] Figure 19 is an enlarged view showing the enlarged “I” portion of Figure 18.

[0046] Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein.

[0047] In order to clearly explain the present invention, parts that are not related to the description are omitted, and the same reference numerals are used for identical or similar components throughout the specification.

[0048] Furthermore, the sizes and thicknesses of each component shown in the drawings are arbitrarily indicated for convenience of explanation, and thus the present invention is not necessarily limited to the illustrated components. In the drawings, the thicknesses are enlarged to clearly represent various layers and regions. Furthermore, in the drawings, the thicknesses of some layers and regions are exaggerated for convenience of explanation.

[0049] Furthermore, when we say that a layer, membrane, region, plate, or other part is "on" or "over" another part, this includes not only cases where it is "directly on" the other part, but also cases where there are other parts in between. Conversely, when we say that a part is "directly on" another part, we mean that there are no other parts in between. Furthermore, saying that a part is "on" or "over" a reference part means that it is located above or below the reference part, and does not necessarily mean that it is located "above" or "over" the reference part in the opposite direction of gravity.

[0050] Additionally, throughout the specification, whenever a part is said to "include" a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise specifically stated.

[0051] Additionally, throughout the specification, when we say "in plan", we mean when the target portion is viewed from above, and when we say "in cross section", we mean when the target portion is viewed from the side in a cross-section cut vertically.

[0052] FIG. 1 is an exploded perspective view showing a battery module (200) according to one embodiment of the present invention. FIG. 2 is a perspective view showing a busbar frame assembly (100) according to one embodiment of the present invention. FIG. 3 is a plan view showing the busbar frame assembly (100) of FIG. 2. Specifically, FIG. 3 shows a view of the busbar frame assembly (100) as viewed from the zy plane of FIG. 2. FIG. 4 is a plan view showing a view of the busbar frame assembly (100) of FIG. 2 as viewed from another angle. Specifically, FIG. 4 shows a view of the busbar frame assembly (100) as viewed from the xy plane of FIG. 2. FIG. 5 is an exploded perspective view showing a busbar (120) of the busbar frame assembly (100) of FIG. 2 in an exploded state. FIG. 6 is a perspective view showing a busbar (120) according to one embodiment of the present invention. FIG. 7 is a plan view showing the busbar (120) of FIG. 6. Fig. 8 is an enlarged view showing the enlarged view of part “A” of Fig. 5. Fig. 9 is a perspective view showing the busbar (120) removed from the busbar frame assembly (100) of Fig. 2. Fig. 10 is an enlarged view showing the enlarged view of part “B” of Fig. 9. Fig. 11 is a perspective view showing the busbar frame assembly (100) of Fig. 2 viewed from a different angle. Fig. 12 is an enlarged view showing the enlarged view of part “C” of Fig. 11.

[0053] Referring to FIGS. 1 to 12, a busbar frame assembly (100) according to one embodiment of the present invention includes a busbar frame (110); and at least one busbar (120) disposed on the busbar frame (110), wherein the at least one busbar (120) includes a first metal layer (130) facing the busbar frame (110) and a second metal layer (140) positioned on an opposite surface of a surface of the first metal layer (130) facing the busbar frame (110). The busbar (120) includes a machined surface (150) on which the first metal layer (130) is exposed, and the busbar frame (110) includes a protrusion (160) corresponding to the machined surface (150). The busbar frame assembly (100) according to the present embodiment may be included in a battery module (100) including a plurality of battery cells (210) including electrode leads (211).

[0054] A busbar frame (110) according to the present invention may be equipped with a busbar (120), a terminal busbar (120), a module connector (190), etc. Specifically, the busbar (120), the terminal busbar (120), the module connector (190), etc. may be equipped on the opposite side of the side of the busbar frame (110) that faces the battery cell stack (220). Here, the battery cell stack (220) refers to a structure formed by stacking a plurality of battery cells (210). The busbar frame (110) may include an electrical insulating material to prevent the busbar (120) from coming into contact with other parts of the battery cell (210) other than the electrode lead (211), thereby causing a short circuit.

[0055] The bus bar (120) according to the present invention can be electrically connected to the electrode leads (211) of the battery cells (210). The bus bar (120) is a component for guiding electrical connections between battery cells (210) within a battery module (200) or for guiding electrical connections of the battery module (200). It is sufficient if it includes a metal material with excellent electrical conductivity, and is not limited in its shape or material.

[0056] The bus bar (120) may be a clad member in which a first metal layer (130) and a second metal layer (140) are joined by rolling. For example, referring to FIGS. 6 and 7 in particular, the bus bar (120) according to the present embodiment may be prepared by joining the first metal layer (130) and the second metal layer (140) of different materials by rolling. For example, the first metal layer (130) may include aluminum (Al), and the second metal layer (140) may include copper (Cu). Here, clad bonding for manufacturing a clad member refers to a technology in which a metal or non-metal is used as a base layer, and another metal is joined to one surface thereof by rolling. It is a technology in which the characteristics of each material are simultaneously exhibited. That is, the first metal layer (130) and the second metal layer (140) can be joined to each other by a clad bonding technique to form a busbar (120) according to the present embodiment. The busbar (120) can be mounted on the busbar frame (110) such that the first metal layer (130) faces the busbar frame (110) and the second metal layer (140) does not face the busbar frame (110).

[0057] In particular, referring to FIGS. 6 and 7, the first metal layer (130) and the second metal layer (140) of the bus bar (120) according to the present invention can be laminated while facing each other. For an area corresponding to a portion of the bus bar (120), the entire second metal layer (140) and a portion of the first metal layer (130) can be cut to expose the first metal layer (130). In the present invention, the machined surface (150) can be the surface where the first metal layer (130) is cut. The machined surface (150) can be formed on the right or left side of the bus bar (120) based on the zy plane of FIG. 6. Through this, the bus bar (120) on which the first metal layer (130) and the second metal layer (140) are laminated can be manufactured in the same mold. A bus bar (120) manufactured in the same mold can be cut in an area corresponding to a portion on the right or left side of the bus bar (120) based on the zy plane of FIG. 6, depending on the arrangement of the battery cell (210) and the electrode lead (211), and a bus bar (120) having a processing surface (150) can be manufactured. Since the bus bar (120) can be manufactured in the same mold, the mold manufacturing cost can be reduced.

[0058] The printed circuit board (180) according to the present embodiment is configured to sense voltage data or thermal data of battery cells (210). For example, the printed circuit board (180) may be connected to electrode leads (211) or bus bars (120) of the battery cells (210). Accordingly, the printed circuit board (180) may sense voltage data of each battery cell (210) and transmit the same to an external BMS (Battery Management System). The BMS may control the operation of the battery module (200) based on the voltage data of the battery cells (210) included in the battery module (200).

[0059] Meanwhile, referring to FIGS. 8 to 12, one end of the protrusion (160) according to the present invention may correspond to the machining surface (150). That is, the machining surface (150) is formed by cutting a portion of the first metal layer (130) and the entire second metal layer (140), and the protrusion (160) may be formed corresponding to the machining surface (150) to the thickness of the first metal layer (130) and the second metal layer (140) cut. As will be described later, the protrusion (160) may be in contact with the machining surface (150).

[0060] Fig. 13 is a cross-sectional view showing a cross-section taken along the cutting line D-D' of Fig. 4. Fig. 14 is an enlarged view showing an enlarged view of part “E” of Fig. 13. Fig. 15 is a cross-sectional view showing a cross-section taken along the cutting line F-F' of Fig. 3. Fig. 16 is an enlarged view showing an enlarged view of part “G” of Fig. 15.

[0061] Referring to FIGS. 5 to 7 and 11 to 16, the processing surface (150) according to the present invention extends to at least one side of the bus bar (120), so that the side surface of the protrusion (160) can come into contact with the processing surface (150).

[0062] The processing surface (150) may correspond to the side surface of the protrusion (160). Therefore, when manufacturing the busbar frame assembly (100), when a worker connects the busbar (120) to the busbar frame (110), the worker can check the protrusion (160) and then connect it by matching the position of the protrusion (160) with the processing surface (150), thereby preventing incorrect assembly by the worker. In other words, due to the introduction of the protrusion (160) that can physically prevent incorrect assembly, the assembling ability of the busbar frame assembly (100) can be increased, which can lead to a reduction in man-hours and product cost.

[0063] In addition, by forming the processing surface (150) by extending it to one side of the bus bar (120), the difficulty of the cutting process for forming the processing surface (150) can be reduced, which can lead to a reduction in the cost of manufacturing the bus bar (120).

[0064] The protrusion (160) according to the present embodiment may be made of an electrically insulating material. That is, both the protrusion (160) and the busbar frame (110) including it may include an electrically insulating material. This can prevent the busbar (120) from coming into contact with the protrusion (160) and causing a short circuit.

[0065] The first metal layer (130) according to one embodiment of the present invention may include aluminum. Conventional bus bars may be composed of a single layer of copper, but copper has excellent thermal and electrical conductivity, but has the disadvantage of being somewhat expensive. Therefore, the bus bar (120) in the present embodiment may not be composed of a single layer of copper, but may include a first metal layer (130) and a second metal layer (140). Since the aluminum included in the first metal layer (130) is about 3 to 4 times cheaper than the copper included in the second metal layer (140) described below, material costs can be reduced.

[0066] The first metal layer (130) including aluminum may have a thickness of 85% or more and 90% or less of the thickness of the bus bar (120). If the thickness of the first metal layer (130) is less than 85% of the thickness of the bus bar (120), the manufacturing cost of the bus bar (120) may become excessively high compared to the desired heat dissipation degree of the bus bar (120). In addition, if the thickness of the first metal layer (130) exceeds 90% of the thickness of the bus bar (120), the heat dissipation degree of the bus bar (120) is insufficient, and the battery module (200) may not satisfy the standard for cooling performance.

[0067] The second metal layer (140) according to the present invention may include copper. Since copper has excellent thermal and electrical conductivity, when applied to the busbar (120), it can improve the cooling performance of the battery module (200) by dissipating heat well. In addition, it can reduce the resistance in the electrical connection with the electrode lead (211). In other words, copper may be included in the second metal layer (140) to increase the heat dissipation of the busbar (120) and reduce the resistance.

[0068] The second metal layer (140) including copper may have a thickness of 10% or more and 15% or less of the thickness of the bus bar (120). If the thickness of the second metal layer (140) exceeds 15% of the thickness of the bus bar (120), the manufacturing cost of the bus bar (120) may become excessively high compared to the desired heat dissipation degree of the bus bar (120). In addition, if the thickness of the second metal layer (140) is less than 10% of the thickness of the bus bar (120), the heat dissipation degree of the bus bar (120) is insufficient, and the battery module (200) may not satisfy the standard for cooling performance.

[0069] Referring back to FIGS. 1 to 5, the busbar (120) according to the present invention may be provided in multiple numbers. In order to satisfy the electrical performance required for the battery pack, the conditions of the battery cell (210) or the battery module (200) (e.g., the number of battery cells (210), whether the battery cells (210) are connected in series / parallel, etc.) may be determined, and the number of busbars (120) may be determined based on these conditions. By providing a plurality of busbars (120) in the busbar frame assembly (100), the busbar frame assembly (100) may respond to various conditions required by the battery cell (210) or the battery module (200).

[0070] FIG. 17 is an exploded perspective view showing a busbar frame assembly (100) according to another embodiment of the present invention.

[0071] Referring to FIGS. 1, 6, and 17, a busbar frame assembly (100) according to another embodiment of the present invention may be such that one of the busbars (120) is positioned such that the machined surface (150) includes the right side (120R) of the busbar (120), and another of the busbars (120) is positioned such that the machined surface (150) includes the left side (120L) of the busbar (120).

[0072] Depending on the arrangement of the battery cell (210) and the electrode lead (211), the position of the machining surface (150) on the bus bar (120) can be determined. For example, depending on the arrangement of a specific electrode lead (211) connected to the machining surface (150), the machining surface (150) can be positioned to include the right side (120R) or the left side (120L) of the bus bar (120).

[0073] By positioning the processing surface (150) to include the right side (120R) or left side (120L) of the bus bar (120), the bus bar frame assembly (100) can respond to various conditions required by the battery cell (210) or battery module (200).

[0074] Referring again to FIG. 1 and FIG. 17, among the bus bars (120) according to the present invention, there may be bus bars (120) having the same shape, and in the bus bars (120) having the same shape, the positions of the processing surfaces (150) may be arranged symmetrically to each other.

[0075] That is, among the bus bars (120) of FIG. 17, some of the bus bars (120a, 120b) may have the same shape, and the remaining bus bars (120c, 120d) may also have the same shape. In addition, the positions of the processing surfaces (150) of some of the bus bars (120a, 120b) and the remaining bus bars (120c, 120d) may be provided symmetrically to each other. By applying bus bars (120) having the same shape, the mold for producing the bus bars (120) can be shared, which may lead to a reduction in the cost of the bus bars (120). As described above, the position of the processing surface (150) is determined according to the arrangement of the battery cells (210) and the electrode leads (211), and the positions of the processing surfaces (150) of the bus bars (120) may be provided symmetrically to each other. In bus bars (120) having the same shape, the positions of the bus bars (120) can be distinguished based on the positions of the processing surface (150) and the corresponding protrusions (160). In other words, even if the bus bars (120) have the same shape, the positions on the bus bar frame (110) can be distinguished based on the positions of the processing surface (150), and as a result, the bus bars (120) can be prevented from being incorrectly assembled at different positions on the bus bar frame (110).

[0076] Hereinafter, the structure of a battery module including a busbar frame assembly according to the present embodiment will be described. Referring again to FIG. 1, a battery module (200) according to one embodiment of the present invention includes a busbar frame assembly (100) according to the present invention; and a plurality of battery cells (210) including electrode leads (211) connected to at least one busbar (120).

[0077] The battery module (200) according to the present embodiment may include a battery cell stack (220) in which a plurality of battery cells (210) including electrode leads (211) are stacked in one direction. In particular, as illustrated in FIG. 1, the plurality of battery cells (210) may be stacked along a direction parallel to the y-axis while standing upright so that one side of the battery body faces the other. Accordingly, the electrode leads (211) may protrude in a direction perpendicular to the direction in which the battery cells (210) are stacked. For example, in the battery cell (210), one electrode lead (211) may protrude toward the x-axis direction, and another electrode lead (211) may protrude toward the -x-axis direction.

[0078] The battery module (200) according to the present embodiment may include a module frame (230) in which a battery cell stack (220) is accommodated. The module frame (230) may include a lower module frame (231) and an upper module frame (232), as illustrated in FIG. 1. The lower module frame (231) and the upper module frame (232) may be joined by bolting or welding, and there is no limitation on the joining method. The module frame (230) is not limited thereto, and may be replaced with a frame of another shape, such as an L-shaped frame or a mono frame that surrounds the battery cell stack (220) except for the front and rear surfaces.

[0079] According to the present embodiment, the busbar frame assemblies (100) may be formed to cover the battery cell stack (220) by being positioned on the open first side (x-axis direction of FIG. 1) and second side (−x-axis direction of FIG. 1) of the module frame (230). In other words, the busbar frame assemblies (100) may be positioned to cover the first side and the second side in the direction in which the electrode leads (211) protrude from the battery cell stack (220). The busbar frame assemblies (100) may electrically connect the battery cells (210) included in the battery cell stack (220) in series or in parallel.

[0080] The battery module (200) according to the present embodiment may further include a busbar frame assembly cover (250) that covers the busbar frame assembly (100). Specifically, the busbar frame assembly cover (250) may cover one side of the busbar frame (110) on which the busbar (120) is mounted. The busbar frame assembly cover (250) may cover and insulate a plurality of busbars (120) for electrical connection of battery cells (210), terminals (not shown) of the battery module (200), and electrode leads (211) to protect them from the outside. In addition, the busbar frame assembly cover (250) may prevent disassembly of the battery module (200) by unspecified persons other than an administrator.

[0081] Although not shown, the busbar frame assembly cover (250) can be detachably connected to the busbar frame (110) by a hook structure. By the hook structure, the busbar frame assembly cover (250) can be fixed to the correct position of the busbar frame (110), and can be easily assembled and disassembled in a one-touch manner.

[0082] Although not shown, in order to prevent the busbar frame assembly cover (250) from moving, a rib structure of a predetermined shape may be provided on the inner wall of the busbar frame (110).

[0083] The above-described battery cell (210) and battery module (200) are exemplary structures, and there is no particular limitation on the type or shape of the battery cell (210) and battery module (200). That is, although a pouch-type battery cell (210) has been described as an example, square battery cells or cylindrical battery cells may also be applied to the battery module (200) according to an embodiment of the present invention. In addition, although a battery module (200) in which battery cells (210) are housed in a module frame (230) has been described as an example, a CTP (cell to pack) type battery module (200) in which a plurality of battery cells (210) are mounted in a battery pack without being housed in a module frame (230) may also be applied as an example of the present invention.

[0084] Fig. 18 is a cross-sectional view showing a cross-section taken along the cutting line H-H' of Fig. 3. Fig. 19 is an enlarged view showing an enlarged view of part “I” of Fig. 18.

[0085] Referring to FIG. 1, FIG. 3, FIG. 18, and FIG. 19, among the electrode leads (211) of the battery cell (210) according to the present invention, the positive electrode lead may be connected to the processing surface (150), and among the electrode leads (211) of the battery cell (210), the negative electrode lead may be connected to the second metal layer (140).

[0086] The bus bar (120) and the electrode lead (211) can be joined by welding. A slit (170) is formed in the bus bar frame (110), and the electrode lead (211) can pass through the slit (170) and be connected to the bus bar (120). The battery cells (210) can be electrically connected in series or parallel via the bus bar (120).

[0087] As described above, the first metal layer (130) according to the present invention may include aluminum. Typically, the anode lead may include aluminum. Since the machined surface (150) where the first metal layer (130) is exposed and the anode lead including aluminum are made of the same material, electrical connection between them can be facilitated. Specifically, the machined surface (150) and the anode lead can be electrically connected by welding, and since the first metal layer (130) includes aluminum, the machined surface (150) and the anode lead can include the same metal. Accordingly, high welding strength can be obtained during welding. In addition, it can have the advantage of minimizing defects at the welded area, which is a disadvantage of dissimilar metal welding.

[0088] Likewise, as described above, the second metal layer (140) according to the present invention may include copper. Typically, the negative electrode lead may include copper. Since the second metal layer (140) and the negative electrode lead including copper are made of the same material, electrical connection may be facilitated. Specifically, the second metal layer (140) and the negative electrode lead may be electrically connected by welding, and the second metal layer (140) may include copper. The second metal layer (140) and the negative electrode lead may include the same metal, and high welding strength may be obtained during welding. In addition, it may have the advantage of minimizing defects at the welded area, which is a disadvantage of dissimilar metal welding.

[0089] One or more battery modules according to the above-described embodiment 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.

[0090] The battery module (200) or battery pack can be applied to various devices. Specifically, it can be applied to means of transportation such as electric bicycles, electric vehicles, and hybrid vehicles, but is not limited thereto, and can be applied to various devices that can use secondary batteries.

[0091] In this example, terms indicating directions such as front, back, left, right, up, and down are used, but these terms are only for convenience of explanation and may vary depending on the location of the target object or the location of the observer.

[0092] Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims also fall within the scope of the present invention.

[0093] Description of the symbol

[0094] 100: Busbar frame assembly

[0095] 110: Busbar frame

[0096] 120: Busbar

[0097] 130: First metal layer

[0098] 140: Second metal layer

[0099] 150: Machining surface

[0100] 160: Protrusion

[0101] 200: Battery module

[0102] 210: Battery cell

[0103] 211: Electrode lead

[0104] 220: Battery cell stack

[0105] 230: Module Frame

Claims

1. Busbar frame; and At least one busbar disposed on the above busbar frame, At least one of the busbars includes a first metal layer facing the busbar frame and a second metal layer located on the opposite side of the side of the first metal layer facing the busbar frame, The above busbar includes a machined surface on which the first metal layer is exposed, The above busbar frame is a busbar frame assembly including a protrusion corresponding to the above processing surface.

2. In paragraph 1, A busbar frame assembly in which the above-mentioned machined surface extends to at least one side of the above-mentioned busbar, such that the side surface of the above-mentioned protrusion is in contact with the above-mentioned machined surface.

3. In paragraph 1, The above protrusion is a busbar frame assembly made of electrical insulating material.

4. In paragraph 1, A busbar frame assembly wherein the first metal layer comprises aluminum (Al).

5. In paragraph 1, A busbar frame assembly wherein the second metal layer comprises copper (Cu).

6. In paragraph 1, The above busbar is a busbar frame assembly provided in multiples.

7. In paragraph 6, A busbar frame assembly wherein one of the busbars is positioned such that the machined surface includes a right side of the busbar, and the other of the busbars is positioned such that the machined surface includes a left side of the busbar.

8. In paragraph 6, Among the above busbars, there are busbars having the same shape, A busbar frame assembly in which the positions of the processing surfaces of the busbars of the same shape as above are arranged symmetrically to each other.

9. Busbar frame assembly according to paragraph 1; and A battery module comprising a plurality of battery cells, each of which includes an electrode lead connected to at least one of the above bus bars.

10. In paragraph 9, A battery module in which the positive electrode lead among the electrode leads of the battery cell is connected to the processed surface, and the negative electrode lead among the electrode leads of the battery cell is connected to the second metal layer.

11. In paragraph 9, A battery module wherein the first metal layer comprises aluminum (Al).

12. In paragraph 9, A battery module wherein the second metal layer comprises copper (Cu).

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