Inter-bus bar unit, pack housing comprising same, battery pack comprising same, and method for manufacturing same

Abstract

The present invention relates to an inter-busbar unit, a pack housing comprising same, a battery pack comprising same, and a method for manufacturing same, the inter-busbar unit comprising: a conductive member electrically connected to a module terminal provided in a battery module; a first partition unit having a seating groove formed therein to receive the conductive member; and a second partition unit seated on an upper portion of the first partition unit, wherein the conductive member is provided such that opposite end portions thereof are exposed toward different side surfaces.

Description

Interbusbar unit, pack housing including same, battery pack including same, and manufacturing method thereof

[0001] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0033075, filed March 8, 2024, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to an interbusbar unit, a pack housing including the same, a battery pack including the same, and a method for manufacturing the same, and more particularly, to an interbusbar unit that can be coupled to a pack housing, a pack housing including the same, a battery pack including the same, and a method for manufacturing the same.

[0003]

[0004] As technological development and demand for mobile devices increase, rechargeable secondary batteries are increasingly being used as energy sources for a variety of mobile devices. Secondary batteries are also attracting attention as an energy source for electric and hybrid electric vehicles, offering an alternative to conventional gasoline and diesel vehicles that rely on fossil fuels.

[0005] Secondary batteries are classified into cylindrical and prismatic batteries, in which the electrode assembly is built into a cylindrical or prismatic metal can, and pouch-type batteries, in which the electrode assembly is built into a pouch-type case made of aluminum laminate sheet, depending on the shape of the battery case.

[0006] The types of secondary batteries widely used today include lithium-ion batteries, lithium polymer batteries, nickel-cadmium batteries, nickel-metal hydride batteries, and nickel-zinc batteries. The operating voltage of these unit secondary battery cells, i.e., unit battery cells, is approximately 2.0 V to 5.0 V. Therefore, when a higher output voltage is required, a cell module assembly may be configured by connecting multiple battery cells in series, and a battery module may be configured by connecting cell module assemblies in series or parallel depending on the required output voltage or charge / discharge capacity. It is common to manufacture a battery pack by adding additional components using at least one of these battery modules.

[0007] However, lithium secondary batteries pose a risk of explosion due to overheating, making safety a critical issue. Overheating can occur for a variety of reasons, one of which is overcurrent flowing through a lithium secondary battery. This overcurrent causes heat generation, rapidly increasing the battery's internal temperature. This rapid rise in temperature can trigger thermal runaway, potentially leading to battery explosion.

[0008] Fig. 1 is a schematic diagram of a battery pack to which a bus bar according to the prior art is applied. As illustrated in Fig. 1, the battery pack may be provided in which a battery module (M) including a plurality of battery cells (1) is connected to an external terminal (3) of another adjacent battery module (M) via an inter-bus bar (4).

[0009] In this case, there is a problem that the remaining part, except for the area where the interbus bar (4) comes into contact with the external terminal (3), is exposed to the discharged matter during thermal runaway, which increases the probability of an internal short circuit occurring.

[0010]

[0011] (Prior art literature)

[0012] (Patent Document 1) Korean Patent Publication No. 10-2015-0028073

[0013]

[0014] In order to solve the above problems, the present invention provides an interbusbar unit, which is provided so that the remaining area except the area in contact with the external terminal of the battery module is not exposed to discharge, thereby reducing the probability of an internal short circuit, a pack housing including the same, a battery pack including the same, and a manufacturing method thereof.

[0015]

[0016] As a technical means for achieving the above purpose, an inter-busbar unit according to one embodiment of the present invention comprises: a conductive member (110) electrically connected to a module terminal (310) provided in a battery module (300); a first bulkhead unit (120) having a mounting groove (121) formed so that the conductive member (110) is mounted; and a second bulkhead unit (130) mounted on the upper portion of the first bulkhead unit (120). The conductive member (110) is characterized in that both ends are exposed toward different sides.

[0017] In addition, in the interbus bar unit according to one embodiment of the present invention, the conductive member (110) is characterized in that it extends along the extension direction in which the first bulkhead unit (120) extends, and the fixing groove (121) is formed to extend along the extension direction with respect to the upper surface of the first bulkhead unit (120).

[0018] In addition, in the interbus bar unit according to one embodiment of the present invention, a first opening (122) is formed in the first bulkhead unit (120) so that one end of the conductive member (110) is exposed from a first side (120a) facing the battery module (300) located on one side, and a third opening (131) is formed in the second bulkhead unit (130) at a position corresponding to the first opening (122) so that one end of the conductive member (110) is exposed from a third side (130a) facing the battery module (300) located on one side.

[0019] In addition, in the interbus bar unit according to one embodiment of the present invention, a second opening (123) is formed in the first bulkhead unit (120) so that the other end of the conductive member (110) is exposed from the second side (120b) facing the battery module (300) located on the other side, and a fourth opening (132) is formed in the second bulkhead unit (130) at a position corresponding to the second opening (123) so that the other end of the conductive member (110) is exposed from the fourth side (130b) facing the battery module (300) located on the other side.

[0020] In addition, in the interbus bar unit according to one embodiment of the present invention, the first opening (122) and the second opening (123) are formed at positions that do not overlap each other along the thickness direction of the first bulkhead unit (120), and the third opening (131) and the fourth opening (132) are formed at positions that do not overlap each other along the thickness direction of the second bulkhead unit (130).

[0021] In addition, in the interbus bar unit according to one embodiment of the present invention, the upper surface of the first bulkhead unit (120) is provided with a protrusion (124) that partially protrudes upward, and the protrusion (124) is characterized in that it is provided for both ends of the first bulkhead unit (120).

[0022] In addition, in the interbus bar unit according to one embodiment of the present invention, the lower surface of the second bulkhead unit (130) is provided with a recessed portion (133) formed by being partially recessed upward at a position corresponding to the protrusion (124), and the recessed portion (133) is characterized in that it can be combined with the protrusion (124).

[0023] In addition, in the interbus bar unit according to one embodiment of the present invention, the conductive member (110) is characterized in that it is provided with an electrically conductive material including a metal material.

[0024] In addition, in the interbus bar unit according to one embodiment of the present invention, an insulating material (111) is applied to the remaining area of ​​the outer surface of the conductive member (110) except for the area in contact with the module terminal (310).

[0025] In addition, a pack housing including an inter-busbar unit according to one embodiment of the present invention is characterized by including an outer frame (210); a lattice-shaped partition wall (220) provided on the inner side of the outer frame (210) and arranged to form a plurality of receiving grooves (230) for receiving the battery module (300); and an inter-busbar unit (100) mounted on the upper portion of the partition wall (220).

[0026] In addition, in the pack housing according to one embodiment of the present invention, the partition wall (220) is characterized by including a first partition wall (221) arranged along a first direction parallel to the axial direction in which the module terminal (310) of the battery module (300) is arranged; and a second partition wall (222) arranged along a second direction orthogonal to the first direction.

[0027] In addition, in the pack housing according to one embodiment of the present invention, the upper surface of the first bulkhead (221) is provided with a coupling protrusion (221a) formed to protrude upward.

[0028] In addition, in the pack housing according to one embodiment of the present invention, the lower surface of the first bulkhead unit (120) is provided with a coupling groove (125) formed by being partially sunken upward at a position corresponding to the coupling protrusion (221a), and the coupling groove (125) is characterized in that it can be coupled with the coupling protrusion (221a).

[0029] In addition, a battery pack including a pack housing according to one embodiment of the present invention is characterized by including the pack housing (200) including the interbus bar unit (100), the outer frame (210) and the bulkhead (220); and the plurality of battery modules (300) having the module terminals (310).

[0030] In addition, in a battery pack including a pack housing according to one embodiment of the present invention, the plurality of battery modules (300) are characterized in that the positions of the module terminals (310) of the battery modules (300) do not overlap with the positions of the module terminals (310) of the battery modules (300) that are closest to each other along the second direction.

[0031] In addition, a battery pack manufacturing method for manufacturing a battery pack including a pack housing according to one embodiment of the present invention is characterized by including: (S1) a step of accommodating the plurality of battery modules (300) in the plurality of receiving grooves (230); (S2) a step of combining the joining groove (125) of the inter-busbar unit (100) with the joining protrusion (221a) of the first bulkhead (221), and combining the inter-busbar unit (100) with the first bulkhead (221); and (S3) a step of electrically contacting the conductive member (110) and the module terminal (310).

[0032] In addition, a battery pack manufacturing method for manufacturing a battery pack including a pack housing according to one embodiment of the present invention is characterized in that, in the step (S1), the plurality of battery modules (300) are arranged such that the positions of the module terminals (310) of the battery modules (300) do not overlap with the positions of the module terminals (310) of the battery modules (300) that are closest to each other along the second direction.

[0033] In addition, a battery pack manufacturing method for manufacturing a battery pack including a pack housing according to one embodiment of the present invention is characterized in that, after the step (S3), it further includes a step of adding an insulating material to the upper surface of the conductive member (110).

[0034]

[0035] As described above, according to the interbusbar unit according to the present invention, the pack housing including the same, the battery pack including the same, and the manufacturing method thereof, the interbusbar is built into the bulkhead and is provided to be surrounded by an insulating material except for a portion electrically connected to a module terminal provided in a battery module, thereby preventing an internal short circuit from occurring even if discharged matter from a cell thermal runaway scatters and settles.

[0036]

[0037] Figure 1 is a schematic diagram of a battery pack to which a bus bar according to the prior art is applied.

[0038] Figure 2 is a perspective view of an interbus bar unit according to one embodiment of the present invention.

[0039] Figure 3 is an exploded perspective view of an interbus bar unit according to one embodiment of the present invention.

[0040] Figure 4 is a conceptual diagram illustrating how an interbus bar unit is assembled according to one embodiment of the present invention.

[0041] Figure 5 is a conceptual diagram illustrating an interbus bar unit according to one embodiment of the present invention being installed on a bulkhead.

[0042] Figure 6 is a drawing for explaining a pack housing according to one embodiment of the present invention.

[0043] FIG. 7 is a drawing for explaining a battery pack including a pack housing according to one embodiment of the present invention.

[0044] Figure 8 is an enlarged view of A shown in Figure 7.

[0045]

[0046] Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail, so that those skilled in the art can easily implement the present invention. However, when describing the operating principles of preferred embodiments of the present invention in detail, if a detailed description of a related known function or configuration is judged to unnecessarily obscure the gist of the present invention, such detailed description will be omitted.

[0047] Additionally, the same drawing reference numerals are used for parts with similar functions and actions throughout the drawings. Throughout the specification, when a part is said to be connected to another part, this includes not only direct connections but also indirect connections with other elements intervening. Furthermore, inclusion of a component does not exclude other components unless specifically stated otherwise, but rather implies the inclusion of additional components.

[0048]

[0049] Below, an interbus bar unit according to the present invention is described.

[0050] FIG. 2 is a perspective view of an interbusbar unit according to an embodiment of the present disclosure, FIG. 3 is an exploded perspective view of an interbusbar unit according to an embodiment of the present disclosure, FIG. 4 is a conceptual diagram for explaining how an interbusbar unit according to an embodiment of the present disclosure is assembled, and FIG. 5 is a conceptual diagram for explaining how an interbusbar unit according to an embodiment of the present disclosure is installed in a bulkhead. In addition, FIG. 6 is a diagram for explaining a pack housing according to an embodiment of the present disclosure, and FIG. 7 is a diagram for explaining a battery pack including a pack housing according to an embodiment of the present disclosure, and FIG. 8 is an enlarged view of A shown in FIG. 7.

[0051]

[0052] Referring to FIGS. 2 to 8, the interbus bar unit (100) includes a conductive member (110), a first bulkhead unit (120), and a second bulkhead unit (130).

[0053] First, the conductive member (110) may be provided to be electrically connected to a module terminal (310) provided in the battery module (300). For example, the conductive member (110) may be electrically connected to the module terminal (310) by having both ends in contact with the module terminal (310).

[0054] The conductive member (110) may be formed of an electrically conductive material including a metal material. For example, the conductive member (110) may be formed of a metal plate. More specifically, the conductive member (110) may be formed of copper, aluminum, nickel, gold, silver, or a combination thereof.

[0055] The conductive member (110) may extend along the extension direction (11 o'clock to 5 o'clock direction as shown in FIG. 2) in which the first bulkhead unit (120) extends. For example, the conductive member (110) may extend along the extension direction in which the first bulkhead unit (120) extends, but the extension length of the conductive member (110) may be provided to be shorter than the extension length of the first bulkhead unit (120). Here, the extension length of the conductive member (110) may be a length extended in the extension direction (11 o'clock to 5 o'clock direction as shown in FIG. 2).

[0056] Additionally, the two ends of the conductive member (110) may be provided in a state in which they are bent in different directions. For example, one end of the conductive member (110) may be provided in a state in which it is bent in the 2 o'clock direction as shown in FIG. 2, and the other end may be provided in a state in which it is bent in the 8 o'clock direction as shown in FIG. 2.

[0057] These conductive members (110) can electrically connect module terminals (310) of adjacent battery modules (300) when the adjacent battery modules (300) are arranged in different directions.

[0058] Additionally, an insulating material (111) may be applied to the remaining area of ​​the outer surface of the conductive member (110) except for both ends that are in contact with the module terminal (310).

[0059] This insulating material (111) is an external insulating material among the inter-busbar components, and can prevent current flow during the subsequent manufacture of the battery pack. For example, the insulating material (111) may be one or more of polybutylene terephthalate (PBT), plastic, inorganic oxide, and non-conductive metal.

[0060] A mounting groove (121) is formed in the first bulkhead unit (120) so that a conductive member (110) is mounted thereon, and this mounting groove (121) can be formed to extend along an extension direction with respect to the upper surface of the first bulkhead unit (120).

[0061] The anchoring groove (121) may be formed to correspond to the extended length of the conductive member (110). For example, the anchoring groove (121) may be formed to a height corresponding to the thickness of the conductive member (110), and as another example, the anchoring groove (121) may be formed to a height corresponding to half (1 / 2) of the thickness of the conductive member (110). However, the anchoring groove (121) is not limited to this height, and may be formed to a height capable of accommodating a portion of the conductive member (110).

[0062] When the height of the mounting groove (121) of the first bulkhead unit (120) is formed to be smaller than the height of the conductive member (110), a receiving groove (not shown) may be formed in the second bulkhead unit (130) so that the conductive member (110) can be mounted in the mounting groove (121) and the remaining area can be accommodated.

[0063] The second bulkhead unit (130) can be mounted on top of the first bulkhead unit (120). That is, the conductive member (110) can be interposed between the first bulkhead unit (120) and the second bulkhead unit (130).

[0064] The upper surface of the first bulkhead unit (120) may be provided with a protrusion (124) that protrudes upward (12 o'clock direction as of FIG. 3). This protrusion (124) may be provided on both ends of the first bulkhead unit (120).

[0065] In other words, the protrusion (124) can be provided on both ends except for the area where the fixing groove (121) of the first bulkhead unit (120) is formed.

[0066] In addition, a recessed portion (133) may be formed by being partially recessed upward at a position corresponding to the protrusion (124) of the first bulkhead unit (120) on the lower surface (6 o'clock direction in FIG. 3) of the second bulkhead unit (130).

[0067] This recessed portion (133) may be provided so as to be combined with the protruding portion (124). The protruding portion (124) and the recessed portion (133) may be provided in a form corresponding to each other.

[0068] Here, the shapes of the protrusion (124) and the recessed portion (133) correspond to each other, meaning that they are provided in a shape that can be interlocked with each other, but so that the protrusion (124) can be inserted into the recessed portion (133), the recessed portion (133) is formed in a groove shape that is larger than the protrusion (124), and a predetermined gap is formed between the outer surface of the protrusion (124) and the inner surface of the recessed portion (133).

[0069] Additionally, it goes without saying that a recessed portion that is partially sunken downward may be provided on the upper surface of the first bulkhead unit (120), and a protruding portion that is partially protruded downward may be provided on the lower surface of the second bulkhead unit (130).

[0070] Additionally, the first bulkhead unit (120) and the second bulkhead unit (130) may be made of the same material as the bulkhead (220) described later. A detailed description thereof will be provided later.

[0071] A first opening (122) may be formed in the first bulkhead unit (120) so that one end of the conductive member (110) is exposed from the first side (120a) facing the battery module (300) located on one side. For example, the first opening (122) may be formed by extending the mounting groove (121) so that one end of the conductive member (110) is exposed from the first side (120a).

[0072] A third opening (131) may be formed in a position corresponding to the first opening (122) in the second bulkhead unit (130) so that one end of the conductive member (110) is exposed from the third side (130a) facing the battery module (300) located on one side. For example, the third opening (131) may be formed by extending a receiving groove (not shown) so that one end of the conductive member (110) is exposed from the third side (130a).

[0073] The first opening (122) and the third opening (131) are formed at positions corresponding to each other, and when overlapped, they can form one hole, and one end of the conductive member (110) can be exposed through this hole.

[0074] The first side (120a) of the first bulkhead unit (120) and the third side (130a) of the second bulkhead unit (130) may be sides in the same lateral direction.

[0075] Additionally, a second opening (123) may be formed in the first bulkhead unit (120) so that the other end of the conductive member (110) is exposed from the second side (120b) facing the battery module (300) located on the other side. For example, the second opening (123) may be formed by extending the mounting groove (121) so that the other end of the conductive member (120) can be exposed from the second side (120b).

[0076] In the second bulkhead unit (130), a fourth opening (132) may be formed at a position corresponding to the second opening (123) so that the other end of the conductive member (110) is exposed from the fourth side (130b) facing the battery module (300) located on the other side. For example, the fourth opening (132) may be formed by extending a receiving groove (not shown) so that the other end of the conductive member (110) can be exposed from the fourth side (130b).

[0077] The second opening (123) and the fourth opening (132) are formed at positions corresponding to each other, and when overlapped, they can form one hole, through which the other end of the conductive member (110) can be exposed.

[0078] The second side (120b) of the first bulkhead unit (120) and the fourth side (130b) of the second bulkhead unit (130) may be sides in the same lateral direction.

[0079] The first opening (122) and the second opening (123) may be formed at positions that do not overlap each other along the thickness direction of the first bulkhead unit (120), and the third opening (131) and the fourth opening (132) may be formed at positions that do not overlap each other along the thickness direction of the second bulkhead unit (130).

[0080] Accordingly, both ends of the conductive member (110) can be exposed toward different sides.

[0081] In addition, the conductive member (110) is accommodated in the mounting groove (121) of the first bulkhead unit (120) and the receiving groove (not shown) of the second bulkhead unit (130) except for the end portions on both sides that are exposed to different sides, thereby minimizing the exposure area from the discharged material and lowering the probability of the conductive member (110) being touched by spark particles compared to the prior art.

[0082]

[0083] Below, a pack housing and a battery pack including an interbus bar according to the present invention are described.

[0084] First, the pack housing (200) includes an outer frame (210), a bulkhead (220), and an inter-busbar unit (100). In addition, the pack housing (200) may include an upper case (not shown) and a lower case (not shown).

[0085] First, the outer frame (210) may be configured to have an empty space formed therein, and to accommodate a plurality of battery modules (300) and a bulkhead (220) in this empty space. For example, the outer frame (210) may be configured in a box shape when combined with an upper case (not shown) and a lower case (not shown).

[0086] The bulkhead (220) may include a first bulkhead (221) and a second bulkhead (222). These bulkheads (220) may be provided on the inside of the outer frame (210) and arranged in a grid shape to form a plurality of receiving grooves (230) for receiving battery modules (300).

[0087] The first bulkhead (221) may be arranged along a first direction parallel to the axial direction (12 o'clock to 6 o'clock direction in FIG. 7) in which the module terminal (310) of the battery module (300) is arranged. In addition, the second bulkhead (222) may be arranged along a second direction orthogonal to the first direction.

[0088] For example, the second bulkhead (222) may be positioned at the center of the first direction reference of the outer frame (210), and the first bulkhead (221) may be positioned spaced apart from the outer frame (210) to correspond to the full width length of the battery module (300).

[0089] The distance between the outer frame (210) and the second bulkhead (222) corresponds to the overall length of the battery module (300), and the distance between the outer frame (210) and the first bulkhead (221) or the first bulkhead (221) and the first bulkhead (221) may correspond to the overall width of the battery module (300).

[0090] By the arrangement of the first bulkhead (221) and the second bulkhead (222), the outer frame (210) and the bulkhead (220) can form a plurality of receiving grooves (230) for receiving the battery module (300). The size of the plurality of receiving grooves (230) can correspond to the size of the battery module (300).

[0091] Meanwhile, the interbus bar unit (100) can be mounted on the upper part of the bulkhead (220).

[0092] To be more specific, the inter-busbar unit (100) can be mounted on the upper portion of the first bulkhead (221) to electrically connect the module terminals (310) of adjacent battery modules (300) along the second direction, which are accommodated in the plurality of accommodation grooves (230).

[0093] The upper surface of the first bulkhead (221) may be provided with a coupling protrusion (221a) that is formed to protrude upward. One or more coupling protrusions (221a) may be provided on the upper surface of the first bulkhead (221).

[0094] In addition, the lower surface of the first bulkhead unit (120) of the interbus bar unit (100) that is mounted on the upper surface of the first bulkhead (221) may be provided with a coupling groove (125) that is formed by being partially sunken upward at a position corresponding to the coupling protrusion (221a).

[0095] This coupling groove (125) may be provided so as to be coupled with a coupling projection (221a). The coupling projection (221a) and the coupling groove (125) may be provided in a form corresponding to each other.

[0096] Here, the shape of the coupling protrusion (221a) and the coupling groove (125) correspond to each other, meaning that they are provided in a shape that can be interlocked with each other, but the coupling groove (125) is formed in a groove shape that is larger than the coupling protrusion (221a) so that the coupling protrusion (221a) can be inserted into the coupling groove (125), and a predetermined gap is formed between the outer surface of the coupling protrusion (221a) and the inner surface of the coupling groove (125).

[0097] In addition, it goes without saying that a coupling groove that is partially sunken downward may be formed on the upper surface of the first bulkhead (221), and a coupling protrusion that is partially protruded downward may be formed on the lower surface of the first bulkhead unit (120).

[0098] It is preferable that the height of the first bulkhead (221) be such that when the inter-busbar unit (100) is mounted on the upper surface, both ends of the conductive member (110) can be mounted on the upper surface of the module terminal (310).

[0099] Additionally, if necessary, an inter-bus bar unit (100) may be installed on the upper part of the second bulkhead (222).

[0100] Meanwhile, a battery pack according to one embodiment of the present invention includes a pack housing (200) and a battery module (300).

[0101] As described above, the pack housing (200) includes an interbusbar unit (100), an outer frame (210), and a bulkhead (220). Since the pack housing (200) including the interbusbar unit (100) is the same as described above, a more detailed description will be omitted.

[0102] The battery module (300) may include a cell assembly (not shown), a module case (not shown), and a module terminal (310).

[0103] First, the cell assembly (not shown) may include a plurality of battery cells. The battery cells may be pouch-type secondary batteries including an electrode assembly, an electrode lead, and a battery case.

[0104] The electrode assembly may be formed of, but is not limited to, a jelly-roll type electrode assembly having a structure in which a separator is interposed between long sheet-shaped cathodes and anodes and then rolled up, a stack type electrode assembly having unit cells in which rectangular cathodes and anodes are stacked with a separator interposed between them, a stack-folding type electrode assembly in which the unit cells are rolled up by a long separator film, or a lamination-stack type electrode assembly in which the unit cells are stacked with a separator interposed between them and attached to each other.

[0105] The positive electrode is composed of a positive electrode current collector and a positive electrode active material applied to the upper and lower surfaces of the positive electrode current collector. A conductive material and a binder may be mixed with the positive electrode active material, and a filler may be further added as needed.

[0106] The negative electrode is composed of a negative electrode current collector and a negative electrode active material applied to the lower and upper surfaces of the negative electrode current collector. A conductive material and a binder may be additionally mixed into the negative electrode active material and coated on the negative electrode current collector.

[0107] The separator prevents shorting between the aforementioned negative electrode and positive electrode and allows only the movement of lithium ions. The material of the separator is preferably one selected from among polyethylene, polypropylene, polyethylene / polypropylene double layer, polyethylene / polypropylene / polyethylene triple layer, polypropylene / polyethylene / polypropylene triple layer, and organic fiber filter paper, but is not limited thereto.

[0108] The battery case that houses the electrode assembly forms a housing using a laminate sheet composed of an outer covering layer, a metal layer, and an inner covering layer.

[0109] Since the inner covering layer is in direct contact with the electrode assembly, it must have insulation and electrolytic resistance, and in order to seal it from the outside, the sealing area where the inner layers are thermally bonded must have excellent thermal bonding strength.

[0110] Materials for such inner covering layers may be selected from, but are not limited to, polyolefin resins such as polypropylene, polyethylene, polyethylene acrylic acid, and polybutylene, which have excellent chemical resistance and good sealing properties, polyurethane resins, and polyimide resins, and polypropylene, which has excellent mechanical properties such as tensile strength, rigidity, surface hardness, and impact strength, and excellent chemical resistance, is most preferable.

[0111] The metal layer in contact with the inner covering layer serves as a barrier layer that prevents moisture or various gases from penetrating into the battery from the outside, and a preferred material for this metal layer is an aluminum film that is lightweight and has excellent formability.

[0112] And the other side of the metal layer is provided with an outer covering layer, and this outer covering layer can use a heat-resistant polymer with excellent tensile strength, moisture permeability, and air permeability to protect the electrode assembly while ensuring heat resistance and chemical resistance, and examples thereof include, but are not limited to, nylon or polyethylene terephthalate.

[0113] Additionally, the module case (not shown) can house such cell assemblies (not shown) within its internal space. The battery module (300) of the present invention is not limited to a specific shape or configuration, and can be provided with various battery modules (300).

[0114] The battery module (300) has a module terminal (310), and may be provided in multiple numbers. A plurality of battery modules (300) may be accommodated in a plurality of accommodation grooves (230) of the pack housing (200).

[0115] At this time, the plurality of battery modules (300) can be arranged so that the position of the module terminal (310) of the battery module (300) does not overlap with the position of the module terminal (310) of the battery module (300) that is closest to the second direction.

[0116] Referring to FIGS. 7 and 8, the module terminal (310a) of the first battery module (300a) may be arranged to face the 6 o'clock direction, and the module terminal (310b) of the second battery module (300b) may be arranged to face the 12 o'clock direction. In this case, one end of the interbusbar unit (100) may be electrically connected to the module terminal (310a) of the first battery module (300a), and the other end of the interbusbar unit (100) may be electrically connected to the module terminal (310b) of the second battery module (300b).

[0117]

[0118] The following describes a method for manufacturing a battery pack according to one embodiment of the present invention with reference to FIGS. 2 to 8.

[0119] A method for manufacturing a battery pack according to the present invention comprises: (S1) a step of accommodating a plurality of battery modules (300) in a plurality of receiving grooves (230); (S2) a step of connecting a connecting groove (125) of an inter-busbar unit (100) with a connecting protrusion (221a) of a first bulkhead (221), and connecting the inter-busbar unit (100) with the first bulkhead (221); and (S3) a step of electrically contacting a conductive member (110) and a module terminal (310).

[0120] In step (S1), the battery module (300) can be arranged so that the module terminal (310) position of the battery module (300) along the second direction does not overlap with the module terminal (310) position of the nearest battery module (300).

[0121] For example, in step (S3), when the conductive member (110) and the module terminal (310) are electrically contacted, the conductive member (110) may be secured on the upper surface of the module terminal (310) to make electrical contact, and a connection may be made through fastening using a bolt.

[0122] In addition, the method for manufacturing a battery pack according to the present invention may include, after step (S3), a step of adding an insulating material to the upper surface of the conductive member (110). Here, the insulating material may be heat-resistant silicone or an insulating tape.

[0123]

[0124] As described above, specific parts of the present invention have been described in detail. To those skilled in the art, such specific descriptions are merely preferred embodiments, and the scope of the present invention is not limited thereby. It is obvious to those skilled in the art that various changes and modifications are possible within the scope and technical idea of ​​the present invention, and it is natural that such changes and modifications fall within the scope of the appended patent claims.

[0125] (Explanation of symbols)

[0126] 100: Interbusbar unit

[0127] 110: Conductive member 111: Insulating material

[0128] 120: 1st bulkhead unit

[0129] 120a: First side 120b: Second side

[0130] 121: Settlement Home

[0131] 122: First opening 123: Second opening

[0132] 124: Protrusion 125: Joining groove

[0133] 130: Second Bulkhead Unit

[0134] 130a: First side 130b: Second side

[0135] 131: Third opening 132: Fourth opening

[0136] 133: Depression

[0137] 200: Pack Housing

[0138] 210: Outer frame

[0139] 220: Bulkhead

[0140] 221: First bulkhead 221a: Joining projection

[0141] 222: Second bulkhead

[0142] 300: Battery module 310: Module terminal

Claims

1. A conductive member electrically connected to a module terminal provided in a battery module; A first bulkhead unit having a mounting groove formed to allow the conductive member to be mounted thereon; and Including a second bulkhead unit mounted on top of the first bulkhead unit, An interbusbar unit characterized in that the above conductive member is provided such that both ends are exposed toward different sides.

2. In paragraph 1, The above conductive member extends along the extension direction in which the first bulkhead unit extends, An interbus bar unit characterized in that the above-mentioned settling groove is formed to extend along the extension direction with respect to the upper surface of the first bulkhead unit.

3. In paragraph 2, A first opening is formed in the first bulkhead unit so that one end of the conductive member is exposed from a first side facing the battery module located on one side, An interbusbar unit characterized in that a third opening is formed in a position corresponding to the first opening so that one end of the conductive member is exposed from a third side facing the battery module located on one side of the second bulkhead unit.

4. In paragraph 3, A second opening is formed in the first bulkhead unit so that the other end of the conductive member is exposed from the second side facing the battery module located on the other side, An interbusbar unit characterized in that a fourth opening is formed in a position corresponding to the second opening so that the other end of the conductive member is exposed from the fourth side facing the battery module located on the other side of the second bulkhead unit.

5. In paragraph 4, The first opening and the second opening are formed at positions that do not overlap each other along the thickness direction of the first bulkhead unit, An interbusbar unit characterized in that the third opening and the fourth opening are formed at positions that do not overlap each other along the thickness direction of the second bulkhead unit.

6. In paragraph 1, The upper surface of the first bulkhead unit is provided with a protrusion that protrudes upwards, An interbusbar unit characterized in that the protrusions are provided on both ends of the first bulkhead unit.

7. In paragraph 6, The lower surface of the second bulkhead unit is provided with a recessed portion formed by being partially recessed upward at a position corresponding to the protrusion, An interbusbar unit characterized in that the above-mentioned recessed portion is connectable with the above-mentioned protrusion.

8. In paragraph 1, An interbusbar unit characterized in that the above conductive member is made of an electrically conductive material including a metal material.

9. In paragraph 8, An interbus bar unit characterized in that an insulating material is applied to the remaining area of ​​the outer surface of the conductive member, excluding the area in contact with the module terminal.

10. In a pack housing including an interbus bar unit according to any one of claims 1 to 9, outer frame; A grid-shaped bulkhead provided on the inner side of the outer frame and arranged to form a plurality of receiving grooves for receiving the battery modules; and A pack housing characterized by including an inter-busbar unit mounted on the upper portion of the bulkhead.

11. In paragraph 10, The above bulkhead, A first bulkhead arranged along a first direction parallel to the axial direction in which the module terminal of the battery module is arranged; and A pack housing characterized by including a second bulkhead arranged along a second direction orthogonal to the first direction.

12. In paragraph 11, A pack housing characterized in that the upper surface of the first bulkhead is provided with a coupling protrusion formed to protrude upward.

13. In paragraph 12, The lower surface of the first bulkhead unit is provided with a joining groove formed by being partially sunken upward at a position corresponding to the joining projection. A pack housing characterized in that the above-mentioned coupling groove is capable of coupling with the above-mentioned coupling projection.

14. A battery pack including a pack housing according to any one of claims 10 to 13, The pack housing including the interbus bar unit, the outer frame and the bulkhead; and A battery pack comprising: a plurality of battery modules having the above module terminals; 15. In paragraph 14, A battery pack characterized in that the plurality of battery modules are arranged so that the module terminal positions of the battery modules do not overlap with the module terminal positions of the battery modules that are closest to each other along the second direction.

16. A method for manufacturing a battery pack according to any one of claims 14 to 15, (S1) A step of accommodating the plurality of battery modules in the plurality of accommodating grooves; (S2) A step of combining the coupling groove of the interbus bar unit with the coupling projection of the first bulkhead, and combining the interbus bar unit with the first bulkhead; and (S3) A method for manufacturing a battery pack, characterized by comprising a step of electrically contacting the conductive member and the module terminal.

17. In paragraph 16, A method for manufacturing a battery pack, characterized in that, in the step (S1), the battery module is arranged so that the module terminal position of the battery module does not overlap with the module terminal position of the nearest battery module along the second direction.

18. In paragraph 16, A battery pack manufacturing method characterized in that, after the above step (S3), it further includes a step of adding an insulating material to the upper surface of the conductive member (110).

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