Battery module

Abstract

The present invention relates to a battery module comprising: a cell assembly including a plurality of battery cells; a main body frame housing the cell assembly in an internal space; a busbar frame provided to be electrically connected to the cell assembly; and an end plate coupled to one side or the other side of the main body frame, wherein the main body frame and the end plate are coupled by a male-female coupling.

Description

Technology Field

[0001] The present invention relates to a battery module, and more specifically, to a battery module in which the assembly position precision of each component is improved. Background Technology

[0003] With the increasing technological development and demand for mobile devices, rechargeable secondary batteries are being used as an energy source for various mobile devices. Secondary batteries are also attracting attention as an energy source for electric vehicles and hybrid electric vehicles, which are being presented as alternatives to conventional gasoline and diesel vehicles that use fossil fuels.

[0004] Secondary batteries are classified according to the shape of the battery case into cylindrical and prismatic batteries, in which the electrode assembly is embedded in a cylindrical or prismatic metal can, and pouch-type batteries, in which the electrode assembly is embedded in a pouch-type case made of aluminum laminate sheets.

[0005] Hybrid and electric vehicles have the advantage of superior fuel efficiency and the ability to emit no or reduced pollutants compared to vehicles using only internal combustion engines, as they can obtain driving power from a battery pack.

[0006] Battery packs used in hybrid or electric vehicles include battery modules containing multiple battery cells, and as multiple battery cells are connected to each other in series and / or parallel, the capacity and output of the battery module are increased.

[0007] FIG. 1 is an exploded perspective view for explaining a battery module according to the prior art.

[0008] Referring to FIG. 1, a battery module according to the prior art is composed of a frame member (20) that accommodates a cell assembly (10) and an end plate (30) that is coupled thereto.

[0009] These frame members (20) and end plates (30) are assembled by determining their posture and position using an assembly jig, and are assembled by applying pressure to all six sides for precise welding.

[0010] At this time, the frame member (20) is provided with a thin thickness, so the frame member (20) may deform when pressure is applied. In addition, there is a problem in that positional accuracy is reduced due to the assembly of parts in a distorted state or position due to tolerances of the parts or alignment or deviations of the assembly jig. Prior art literature

[0012] Korean Published Patent Document No. 10-2023-0064565 The problem to be solved

[0013] To solve the above-mentioned problems, the purpose is to provide a battery module in which deformation of the parts is minimized during the assembly or fastening process and the assembly position precision of each part is improved. means of solving the problem

[0015] As a technical means for achieving the above-mentioned purpose, a battery module according to one embodiment of the present invention comprises: a cell assembly (100) including a plurality of battery cells; a main body frame (200) housing the cell assembly (100) in an internal space; a busbar frame (300) provided to be electrically connected to the cell assembly (100); and an end plate (400) coupled to one side or the other side of the main body frame (200), wherein the main body frame (200) and the end plate (400) are coupled by a male-female coupling.

[0016] In addition, in a battery module according to one embodiment of the present invention, the end plate (400) is characterized by including a first end plate (410) coupled to one side of the main body frame (200); and a second end plate (420) coupled to the other side of the main body frame (200).

[0017] In addition, in a battery module according to one embodiment of the present invention, the first end plate (410) is characterized by comprising a first end plate (411) located on one side of the main body frame (200) and having one or more second protrusions (411a) along the edge, and a first end plate (412) coupled to the other side of the first end plate (411) and configured to electrically insulate the cell assembly (100) from the first end plate (411).

[0018] In addition, in a battery module according to one embodiment of the present invention, a first fastening hole (411c) is formed in the first end plate (411), and a first fastening member (412a) is provided in the first end plate (412), so that the first end plate (411) and the first end plate (412) are coupled by the coupling of the first fastening hole (411c) and the first fastening member (412a).

[0019] In addition, in a battery module according to one embodiment of the present invention, the second end plate (420) is characterized by comprising a second end plate (421) located on the other side of the main body frame (200) and having one or more third protrusions (421a) along the edge, and a first end plate (422) coupled to one side of the second end plate (421) and configured to electrically insulate the cell assembly (100) from the second end plate (421).

[0020] In addition, in a battery module according to one embodiment of the present invention, a second fastening hole (421b) is formed in the seconda end plate (421), and a second fastening member (422a) is provided in the secondb end plate (422), so that the seconda end plate (421) and the secondb end plate (422) are coupled by the coupling of the second fastening hole (421b) and the second fastening member (422a).

[0021] In addition, in a battery module according to one embodiment of the present invention, the main body frame (200) is characterized by comprising: a first main body frame (210) in which the cell assembly (100) is housed in an internal space and which has an open top and both sides; and a second main body frame (220) which is seated on the top of the first main body frame (210).

[0022] In addition, in a battery module according to one embodiment of the present invention, a first recess (211) is formed at one end of the first main body frame (210) such that a portion of the area is recessed inward, and a third recess (221a) is formed at one end of the second main body frame (220) such that a portion of the area is recessed inward, and the first recess (211) and the third recess (221a) are characterized by being male and female coupled with the second protrusion (411a).

[0023] In addition, in a battery module according to one embodiment of the present invention, the second main body frame (220) is provided with an extension portion (221) formed with a central portion protruding, and the third recessed portion (221a) is formed on the extension portion (221).

[0024] In addition, in a battery module according to one embodiment of the present invention, one or more second protrusions (411a) are formed on each side of the first end plate (411), and the first end plate (411) is characterized by having a seating die (411b) formed with a partially recessed upper edge so that the extension (221) is seated thereon.

[0025] In addition, in a battery module according to one embodiment of the present invention, a second recessed portion (212) is formed at the other end of the first main body frame (210) such that a portion of the area is recessed inward, and a fourth recessed portion (222) is formed at the other end of the second main body frame (220) such that a portion of the area is recessed inward, and the second recessed portion (212) and the fourth recessed portion (222) are characterized by being male and female coupled with the third protrusion portion (421a).

[0026] In addition, in a battery module according to one embodiment of the present invention, the third protrusion (421a) is characterized by being formed at least one on each side of the seconda end plate (421).

[0027] In addition, in a battery module according to one embodiment of the present invention, a first protrusion (213) is formed on the upper side of the first main body frame (210) such that a portion of the area protrudes upward, and a fifth recess (223) is formed on the side of the second main body frame (220) such that a portion of the area is recessed inward, and the first protrusion (213) and the fifth recess (223) are characterized by being male and female coupled to each other.

[0028] In addition, in a battery module according to one embodiment of the present invention, the busbar frame (300) is characterized by including a first busbar frame (310) disposed on one side of the cell assembly (100) and a second busbar frame (320) disposed on the other side of the cell assembly (100).

[0029] In addition, in a battery module according to one embodiment of the present invention, the first busbar frame (310) includes a module terminal (311) protruding to one side, and the first end plate (412) is provided with a terminal hole (412b) formed to allow the module terminal (311) to pass through. Effects of the invention

[0031] As explained above, the battery module according to the present invention has the advantage that the assembly of the main body frame and the end plate is easy because the main body frame and the end plate are joined through a male-female coupling structure.

[0032] In addition, according to the battery module of the present invention, since the main body frame and the end plate are joined through a male-female coupling structure, the joining position is accurate, which has the advantage of minimizing deformation of the main body frame. Brief explanation of the drawing

[0034] FIG. 1 is an exploded perspective view for explaining a battery module according to the prior art. FIG. 2 is a perspective view for explaining a battery module according to one embodiment of the present invention. FIG. 3 is an exploded perspective view for explaining a battery module according to one embodiment of the present invention. FIG. 4 is a perspective view for explaining the main body frame of a battery module according to one embodiment of the present invention. Figure 5 is a drawing to explain how part A shown in Figure 4 is combined. FIG. 6 is a perspective view illustrating the state in which a first end plate of a battery module according to one embodiment of the present invention is coupled to a main body frame. FIG. 7 is an exploded perspective view for explaining the first end plate of a battery module according to one embodiment of the present invention. FIG. 8 is a perspective view illustrating the state prior to the first end plate of a battery module according to one embodiment of the present invention being coupled to the main body frame. FIG. 9 is a perspective view of the first end plate shown in FIG. 8, viewed from the other side. Figure 10 is an enlarged view of parts B and C of Figure 6. FIG. 11 is a perspective view illustrating the state in which a second end plate of a battery module according to one embodiment of the present invention is coupled to a main body frame. FIG. 12 is an exploded perspective view for explaining a second end plate of a battery module according to one embodiment of the present invention. FIG. 13 is a perspective view illustrating the state prior to the second end plate of a battery module according to one embodiment of the present invention being coupled to the main body frame. FIG. 14 is a perspective view of the second end plate shown in FIG. 13, viewed from the other side. Specific details for implementing the invention

[0035] Embodiments that enable a person skilled in the art to easily implement the present invention are described in detail below with reference to the attached drawings. However, in describing the operating principles of preferred embodiments of the present invention in detail, if it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the essence of the present invention, such detailed description is omitted.

[0036] In addition, the same reference numerals are used for parts having similar functions and operations throughout the drawings. Throughout the specification, when a part is described as being connected to another part, this includes not only cases where they are directly connected, but also cases where they are indirectly connected with other elements in between. Furthermore, unless specifically stated otherwise, the inclusion of a certain component does not exclude other components but implies that additional components may be included.

[0038] Hereinafter, a battery module according to the present invention will be described.

[0039] FIG. 2 is a perspective view for explaining a battery module according to one embodiment of the present invention, and FIG. 3 is an exploded perspective view for explaining a battery module according to one embodiment of the present invention. FIG. 4 is a perspective view for explaining a main body frame of a battery module according to one embodiment of the present invention, and FIG. 5 is a drawing for explaining the combined appearance of part A shown in FIG. 4.

[0040] Referring to FIGS. 2 to 5 together, the battery module according to the present invention includes a cell assembly (100), a main body frame (200), a busbar frame (300), and an end plate (400).

[0041] First, the cell assembly (100) may include a plurality of battery cells. The battery cell may be a pouch-type secondary battery comprising an electrode assembly, an electrode lead, and a battery case.

[0042] The electrode assembly may be composed of, but is not limited to, a jelly-roll type electrode assembly having a structure in which a separator is interposed between a long sheet-type cathode and an anode and then wound; a stack type electrode assembly composed of unit cells having a structure in which rectangular anodes and cathodes are stacked with a separator interposed between them; a stack-folding type electrode assembly in which unit cells are wound by a long separating film; or a lamination-stack type electrode assembly in which unit cells are stacked with a separator interposed between them and attached to one another.

[0043] The positive electrode is composed of a positive current collector and a positive active material coated on the upper and lower surfaces of the positive current collector; the positive active material may be mixed with a conductive material and a binder, and a filler may be further added if necessary.

[0044] The cathode is composed of a cathode current collector and a cathode active material applied to the lower and upper surfaces of the cathode current collector, and a conductive material and a binder may be additionally mixed into the cathode active material and coated onto the cathode current collector.

[0045] The separator prevents a short circuit between the aforementioned cathode and anode and enables only the movement of lithium ions. The material of such a separator is preferably selected from polyethylene, polypropylene, a polyethylene / polypropylene double layer, a polyethylene / polypropylene / polyethylene triple layer, a polypropylene / polyethylene / polypropylene triple layer, and organic fiber filter paper, but is not limited thereto.

[0046] The battery case housing the electrode assembly forms a housing section using a laminate sheet composed of an outer coating layer, a metal layer, and an inner coating layer.

[0047] Since the inner coating layer comes into direct contact with the electrode assembly, it must possess insulation and electrostatic resistance. Additionally, to ensure sealing from the outside, the sealing area formed by the thermal bonding of the inner layers must have excellent thermal bonding strength.

[0048] The material for this inner coating layer may be selected from, but is not limited to, polyolefin resins such as polypropylene, polyethylene, polyethylene acrylic acid, and polybutylene, polyurethane resins, and polyimide resins, which have excellent chemical resistance and good sealing properties; however, polypropylene is most preferable as it has excellent mechanical properties such as tensile strength, stiffness, surface hardness, and impact strength, as well as excellent chemical resistance.

[0049] The metal layer in contact with the inner coating layer serves as a barrier layer that prevents moisture or various gases from penetrating into the battery from the outside, and a lightweight aluminum film with excellent formability can be used as a preferred material for this metal layer.

[0050] In addition, an outer coating layer is provided on the other side of the metal layer, and this outer coating layer may use a heat-resistant polymer with excellent tensile strength, moisture resistance, and air permeability resistance to ensure heat resistance and chemical resistance while protecting the electrode assembly, and may use, for example, nylon or polyethylene terephthalate, but is not limited thereto.

[0051] Meanwhile, the main body frame (200) may include a first main body frame (210) and a second main body frame (220). The first main body frame (210) may be a frame in which a cell assembly (100) is housed in an internal space and the top (12 o'clock direction in FIG. 3) and both sides (4-10 o'clock direction in FIG. 3) are open. That is, the first main body frame (210) may be a U-shaped frame (U-Type frame).

[0052] A first recessed portion (211) and a second recessed portion (212), in which a portion of the inner area is recessed, may be formed at one end and the other end of the first main body frame (210), respectively, and a detailed explanation regarding this will be provided later.

[0053] Additionally, a first projection (213) that partially protrudes upward may be formed on the upper side of the first main body frame (210). For example, the first projection (213) may be formed by partially protruding upward from a predetermined area of ​​the upper edge of a pair of sides supporting both sides of the cell assembly (100).

[0054] Here, it is preferable that the first projection (213) be provided in multiple numbers, and more preferable that multiple numbers be provided on the upper side of each side.

[0055] Additionally, the second main body frame (220) may be a frame that is seated on the top of the first main body frame (210). That is, the second main body frame (220) may be an upper plate that is seated on the top of the first main body frame (210), which is a U-shaped frame, and accordingly, a cell assembly (100) may be stored in the internal space of the main body frame (200).

[0056] A third recess (221a) and a fourth recess (222), in which a portion of the area is recessed inward, may be formed at one end and the other end of the second main body frame (220), respectively. The third recess (221a) may be formed on an extension (221) formed by protruding the central part of one end (4 o'clock direction in FIG. 3) of the second main body frame (200), and a detailed description of the third recess (221a) and the fourth recess (222) will be provided later.

[0057] Additionally, a fifth recess (223) may be formed on the side of the second main body frame (220), in which a portion of the area is recessed inward. The fifth recess (223) may be provided to be male-female coupled with the first protrusion (213). Here, the male-female coupling may refer to a coupling (connection) in which the first protrusion (213) is inserted into the fifth recess (223).

[0058] The fifth recess (223) may be formed to correspond to the size and position in which the first protrusion (213) can be inserted. For example, the fifth recess (223) may be preferably set to be larger than the size of the first protrusion (213) to account for construction errors, manufacturing errors, etc., but may be set so as to restrict movement in one direction and the other direction (4 o'clock to 10 o'clock direction in FIG. 2) of the first main body frame (210) and the second main body frame (220).

[0059] These first main body frame (210) and second main body frame (220) can be prevented from moving in one direction and the other direction during assembly.

[0060] The busbar frame (300) may be provided to be electrically connected to the cell assembly (100). The busbar frame (300) connects a plurality of battery cells included in the cell assembly (100) in series and / or parallel, and may be formed of a metal material with excellent electrical conductivity, and the shape of the width and thickness may be appropriately selected according to the structure of the battery module, etc.

[0061] In addition, various methods can be used to electrically connect the busbar frame (300) and the cell assembly (100).

[0062] These busbar frames (300) may include a first busbar frame (310) positioned on one side of the cell assembly (100) (4 o'clock direction in FIG. 3) and a second busbar frame (320) positioned on the other side of the cell assembly (100) (10 o'clock direction in FIG. 3).

[0063] The first busbar frame (310) may be provided with a module terminal (311) protruding to one side. This module terminal (311) may connect the battery module to other external components, for example, other battery modules or pack terminals. The module terminal (311) may be a terminal through which a charge / discharge current flows for the cell assembly (100), and the module terminal (311) may be provided with a positive terminal and a negative terminal.

[0064] Additionally, the end plates (400) may be provided to be coupled to both sides of the main body frame (200).

[0065] These end plates (400) may include a first end plate (410) coupled to one side of the main body frame (200) and a second plate (420) coupled to the other side of the main body frame (200).

[0066] FIG. 6 is a perspective view illustrating the state in which a first end plate of a battery module according to one embodiment of the present invention is coupled to a main body frame, and FIG. 7 is an exploded perspective view illustrating the first end plate of a battery module according to one embodiment of the present invention.

[0067] Also, FIG. 8 is a perspective view illustrating the state before the first end plate of a battery module according to one embodiment of the present invention is coupled to the main body frame, FIG. 9 is a perspective view of the first end plate shown in FIG. 8 viewed from the other side, and FIG. 10 is an enlarged view of parts B and C of FIG. 6.

[0068] Referring to FIGS. 2 through 10 together, the first end plate (410) may include a firsta end plate (411) and a firstb end plate (412). The firsta end plate (411) may be located on one side of the main body frame (200) (4 o'clock direction with respect to FIG. 2).

[0069] Additionally, the firsta end plate (411) may be provided with one or more second protrusions (411a) along the edge, and one or more of these second protrusions (411a) may be formed on each side of the firsta end plate (411). For example, one or more, preferably two or more, second protrusions (411a) may be formed on each of the four sides of the firsta end plate (411).

[0070] The second protrusion (411a) can be male-female coupled with the first recess (211) formed in the first main body frame (210) and the third recess (221a) formed in the second main body frame (220). For example, the first recess (211) can be formed one or more times on one end (three sides) of the three plates forming the first main body frame (210), and the third recess (221a) can be formed one or more times on one end (one side) of the second main body frame (220).

[0071] The first depression (211) and the third depression (221a) may be provided such that the formation location and size of the second protrusion (411a) correspond to each other. As previously explained, it may be preferable for the first depression (211) and the third depression (221a) to be set larger than the size of the second protrusion (411a) to account for the error range, taking into account construction errors, manufacturing errors, etc.

[0072] And, at the upper part of the first end plate (411), a partially recessed seating die (411b) may be formed so that an extension (221), formed by protruding the central part of one end of the second main body frame (210), may be seated.

[0073] The mounting die (411b) may have a partially recessed shape corresponding to the shape and thickness of the extension (221), and additionally, the mounting die (411b) may be provided with a second protrusion (411a) to be coupled with a third recess (221a) formed in the extension (221).

[0074] As a result, the extension part (221) is seated on the seating die (411b), and the second protrusion part (411a) and the third recess (221a) are joined together, thereby allowing the first end plate (411) and the second main body frame (220) to be connected (joined) more stably.

[0075] Meanwhile, a first fastening hole (411c) may be formed in the firsta end plate (411), and one or more first fastening holes (411c) may be formed in the firsta end plate (411) in a slit shape. These first fastening holes (411c) may be formed for fastening (combining) with the firstb end plate (412).

[0076] The first-b end plate (412) may be coupled to the first-a end plate (411) while located on the other side of the first-a end plate (411), that is, between the first-a end plate (411) and the first busbar frame (310), so as to provide electrical insulation between the cell assembly (100) and the first-a end plate (411). For example, the first-b end plate (412) may be provided with an electrically insulating material, and is not particularly limited as long as it is a material having insulating and heat-resistant properties.

[0077] A first fastening member (412a) may be provided on the first end plate (412). The first fastening member (412a) may be provided to be coupled with the first fastening hole (411c) of the first end plate (411), and the first end plate (411) and the first end plate (412) may be coupled by the coupling of the first fastening member (412a) and the first fastening hole (411c).

[0078] For example, the first fastening member (412a) may be provided in the form of a hook that partially protrudes toward one side from one side of the first end plate (412), with the end bent at a predetermined angle. Here, when the first fastening member (412a) is inserted into the first fastening hole (411c), it is inserted elastically at an angle along a predetermined angle.

[0079] One or more of these first fastening members (412a) may be provided on one side of the firstb end plate (412).

[0080] Additionally, a terminal hole (412b) may be formed in the first end plate (412) so that the module terminal (311) of the first busbar frame (310) can pass through it. The terminal hole (412b) may be provided to expose the module terminal (311) to the outside, and accordingly, the module terminal (311) may be exposed to the outside through the terminal hole (412b) and electrically connected to other external components.

[0081] FIG. 11 is a perspective view illustrating the state in which a second end plate of a battery module according to one embodiment of the present invention is coupled to a main body frame, and FIG. 12 is an exploded perspective view illustrating the second end plate of a battery module according to one embodiment of the present invention. FIG. 13 is a perspective view illustrating the state prior to the second end plate of a battery module according to one embodiment of the present invention being coupled to a main body frame, and FIG. 14 is a perspective view of the second end plate shown in FIG. 13 viewed from the other side.

[0082] Referring together to FIGS. 2 to 5 and FIGS. 11 to 15, the second end plate (420) may include a seconda end plate (421) and a secondb end plate (422). The seconda end plate (421) may be located on the other side of the main body frame (200) (at the 10 o'clock direction with respect to FIG. 2).

[0083] Additionally, the seconda end plate (421) may be provided with one or more third protrusions (421a) along the edge, and one or more of these third protrusions (421a) may be formed on each side of the seconda end plate (421). For example, one or more (e.g., two) third protrusions (421a) may be formed on each of the four sides of the seconda end plate (421).

[0084] The third protrusion (421a) can be male-female coupled with the second recess (212) formed in the first main body frame (210) and the fourth recess (222) formed in the second main body frame (220). For example, the second recess (212) can be formed one or more times on the other ends (three sides) of the three plates forming the first main body frame (210), and the fourth recess (222) can be formed one or more times on the other end (one side) of the second main body frame (220).

[0085] The second recess (212) and the fourth recess (222) may be provided so that the formation location and size of the third protrusion (421a) correspond to each other. As previously explained, it may be preferable for the second recess (212) and the fourth recess (222) to be set larger than the size of the third protrusion (421a) to account for the error range, taking into account construction errors, manufacturing errors, etc.

[0086] In addition, a partially recessed seating die (not shown) may be formed on the upper part of the second end plate (421) so that the other end of the second main body frame (210) is seated thereon, and the seating die (not shown) is provided with a third projection (421a) so that it can be coupled with the fourth recess (222).

[0087] Meanwhile, a second fastening hole (421b) may be formed in the seconda end plate (421), and one or more second fastening holes (421b) may be formed in the seconda end plate (421) in a slit shape. These second fastening holes (421b) may be formed for fastening (combining) with the secondb end plate (422).

[0088] The secondb end plate (422) is coupled to the seconda end plate (421) while interposed between the seconda end plate (421) and the second busbar frame (320) on one side of the seconda end plate (421), and may be configured to electrically insulate the cell assembly (100) from the seconda end plate (421). For example, the secondb end plate (422) may be made of the same material as the firstb end plate (412).

[0089] A second fastening member (422a) may be provided on the second end plate (422). The second fastening member (422a) may be provided to be coupled with the second fastening hole (421b) of the second end plate (421), and the second end plate (421) and the second end plate (422) may be coupled by the coupling of the second fastening member (422a) and the second fastening hole (421b).

[0090] For example, the second fastening member (422a) may be provided in the form of a hook, with its end partially protruding toward the other side from the other side of the secondb end plate (422) and bent at a predetermined angle. Here, when the second fastening member (422a) is inserted into the second fastening hole (421b), it is inserted elastically at an angle along a predetermined angle.

[0091] One or more of these second fastening members (422a) may be provided on the other side of the secondb end plate (422).

[0092] As described above, the battery module of the present invention may have a first end plate (410) and a second end plate (420) coupled to one side and the other side of the main body frame (200) by a male-female coupling. Accordingly, the first end plate (410) and the second end plate (420) can minimize movement in the vertical direction (6 o'clock to 12 o'clock direction in FIG. 2) with respect to the first main body frame (210), and can minimize movement in the horizontal direction (1 o'clock to 7 o'clock direction in FIG. 2) with respect to the second main body frame (220). Of course, deformation of the parts can be minimized during assembly or pressure of the main body frame (200) and the end plate (400), thereby improving the precision of the assembly position.

[0094] As specific parts of the present invention have been described in detail above, it is obvious to those skilled in the art that such specific descriptions are merely preferred embodiments and do not limit the scope of the invention, and that various changes and modifications are possible within the scope and spirit of the invention, and that such variations and modifications fall within the scope of the appended claims. Explanation of the symbols

[0095] 100: Cell Assembly 200: Main body frame 210: 1st main body frame 211: 1st depression 212: 2nd depression 213: 1st projection 220: Second main body frame 221: Extension part 221a: Third depression part 222: 4th depression 223: 5th depression 300: Busbar Frame 310: 1st busbar frame 311: Module terminal 320: Second busbar frame 400: End plate 410: First end plate 411: 1a End Plate 411a: Second projection 411b: Seating die 411c: First fastening hole 412: 1b End Plate 412a: First fastening member 412b: Terminal hole 420: Second end plate 421: 2a End Plate 421a: Third projection 421b: Second fastening hole 422: 2b end plate 422a: 2nd fastening member

Claims

Claim 1 A battery module comprising: a cell assembly including a plurality of battery cells; a main body frame housing the cell assembly in an internal space; a busbar frame provided to be electrically connected to the cell assembly; and an end plate coupled to one side or the other side of the main body frame; wherein the main body frame and the end plate are coupled by a male-female coupling, and the end plate includes a first end plate coupled to one side of the main body frame, and the first end plate includes a first end plate a firsta end plate located on one side of the main body frame and having one or more second protrusions along its edge, and a firstb end plate coupled to the other side of the firsta end plate and provided to electrically insulate the cell assembly from the firsta end plate. Claim 2 A battery module according to claim 1, wherein the end plate further comprises a second end plate coupled to the other side of the main body frame. Claim 3 delete Claim 4 A battery module according to claim 1, wherein a first fastening hole is formed in the first end plate of the first a and a first fastening member is provided in the first end plate of the first b, and the first end plate of the first a and the first end plate of the first b are joined by the combination of the first fastening hole and the first fastening member. Claim 5 A battery module according to claim 2, wherein the second end plate comprises a second end plate, a second end plate located on the other side of the main body frame and having one or more third protrusions along its edge, and a second end plate coupled to one side of the second end plate and configured to electrically insulate the cell assembly from the second end plate. Claim 6 A battery module according to claim 5, wherein a second fastening hole is formed in the second end plate of the second a and a second fastening member is provided in the second end plate of the second b, and the second end plate of the second a and the second end plate of the second b are joined by the combination of the second fastening hole and the second fastening member. Claim 7 A battery module according to claim 5, wherein the main body frame comprises: a first main body frame having an internal space for housing the cell assembly and having the top and both sides open; and a second main body frame seated on the top of the first main body frame. Claim 8 A battery module according to claim 7, wherein a first recess is formed at one end of the first main body frame in which a portion of the area is recessed inward, and a third recess is formed at one end of the second main body frame in which a portion of the area is recessed inward, and wherein the first recess and the third recess are male-female coupled with the second protrusion. Claim 9 A battery module according to claim 8, wherein the second main body frame is provided with an extension portion formed by protruding a central portion, and the third recess is formed on the extension portion. Claim 10 A battery module according to claim 9, wherein one or more of the second protrusions are formed on each side of the first end plate, and the first end plate has a seating die formed therein with a partially recessed upper edge so as to accommodate the extension. Claim 11 A battery module according to claim 7, wherein a second recess is formed at the other end of the first main body frame in which a portion of the area is recessed inward, and a fourth recess is formed at the other end of the second main body frame in which a portion of the area is recessed inward, and wherein the second recess and the fourth recess are male-female coupled with the third protrusion. Claim 12 A battery module according to claim 11, characterized in that one or more of the third protrusions are formed on each side of the seconda end plate. Claim 13 A battery module according to claim 7, wherein a first projection is formed on the upper side of the first main body frame with a portion protruding upward, a fifth recess is formed on the side of the second main body frame with a portion recessed inward, and the first projection and the fifth recess are joined to each other in a male-female manner. Claim 14 A battery module according to paragraph 2, wherein the busbar frame comprises a first busbar frame disposed on one side of the cell assembly and a second busbar frame disposed on the other side of the cell assembly. Claim 15 A battery module according to claim 14, wherein the first busbar frame includes a module terminal protruding to one side, and the first end plate has a terminal hole formed to allow the module terminal to pass through.

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