Battery module

Abstract

Disclosed is a battery module including: a battery cell assembly including a plurality of battery cells; a main body frame configured to accommodate the battery cell assembly in an internal space thereof; a bus bar frame electrically connected to the battery cell assembly; and an end plate coupled to one side or the other side of the main body frame, in which the main body frame and the end plate are coupled to each other by convex-concave coupling.

Description

Technical Field

[0001] This application claims the benefit of priority from Korean Patent Application No. 2023-0188263, filed on December 21, 2023, the disclosure of which is incorporated herein by reference in its entirety.

[0002] The present invention relates to a battery module, and more particularly, to a battery module with improved assembly position accuracy of various components. Background Art

[0003] With the technological development and increasing demand for mobile devices, secondary batteries that can be charged and discharged have been used as energy sources for various mobile devices. Secondary batteries are also attracting attention as energy sources for electric vehicles and hybrid electric vehicles, which are alternatives to existing gasoline and diesel vehicles that use fossil fuels.

[0004] According to the shape of the battery case, secondary batteries are classified into cylindrical batteries having an electrode assembly mounted in a cylindrical metal can, square batteries having an electrode assembly mounted in a square metal can, and pouch-type batteries having an electrode assembly mounted in a pouch-type case made of an aluminum laminate sheet.

[0005] Hybrid vehicles or electric vehicles have advantages of obtaining driving force from a battery pack, having higher fuel efficiency than a vehicle using only an internal combustion engine, and emitting no or reduced pollutants.

[0006] A battery pack used in a hybrid vehicle or an electric vehicle includes a battery module including a plurality of battery cells, and as the plurality of battery cells are connected to each other in series and / or in parallel, the capacity and output of the battery module increase.

[0007] Figure 1 is an exploded perspective view showing a conventional battery module.

[0008] Reference Figure 1 , a conventional battery module includes a frame member 20 configured to accommodate a battery cell assembly 10 and an end plate 30 coupled thereto.

[0009] The frame member 20 and the end plate 30 are assembled to each other in a state where postures and positions thereof are determined by an assembling jig, and are assembled to each other in a state where all six surfaces thereof are pressed for precise welding.

[0010] At this time, since the frame member 20 has a small thickness, the frame member 20 may be deformed when pressed. In addition, due to the tolerance of the components or the alignment or deviation of the assembly jig, the components are assembled with each other in a state where the posture and position of the components are deformed, thereby reducing the position accuracy.

[0011] (Prior art literature)

[0012] (Patent Document 1) Korean Patent Application Publication No. 10-2023-0064565 Summary of the Invention

[0013] Technical issues

[0014] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a battery module configured so as to minimize deformation of components during assembly or fastening of the components and to improve assembly position accuracy of the respective components.

[0015] Technical Solution

[0016] As a technical means for achieving the above-mentioned purpose, a battery module according to an embodiment of the present invention includes: a battery cell assembly (100) including a plurality of battery cells; a main frame (200) configured to accommodate the battery cell assembly (100) in its internal space; a busbar frame (300) electrically connected to the battery cell assembly (100); and an end plate (400) coupled to one side or the other side of the main frame (200), wherein the main frame (200) and the end plate (400) are coupled to each other by convex-concave coupling.

[0017] In addition, in the battery module according to an embodiment of the present invention, the end plate (400) may include a first end plate (410) coupled to one side of the main frame (200); and a second end plate (420) coupled to the other side of the main frame (200).

[0018] In addition, in the battery module according to an embodiment of the present invention, the first end plate (410) may include a 1a end plate (411), located on one side of the main frame (200), the 1a end plate being provided with at least one second protrusion (411a) along its edge; and a 1b end plate (412), coupled to the other side of the 1a end plate (411), the 1b end plate being configured to electrically insulate the battery cell assembly (100) and the 1a end plate (411) from each other.

[0019] In addition, in the battery module according to an embodiment of the present invention, a first fastening hole (411c) can be formed in the 1a end plate (411), a first fastening member (412a) can be provided on the 1b end plate (412), and the 1a end plate (411) and the 1b end plate (412) can be combined with each other through the combination between the first fastening hole (411c) and the first fastening member (412a).

[0020] In addition, in the battery module according to an embodiment of the present invention, the second end plate (420) may include a 2a end plate (421), located on the other side of the main frame (200), the 2a end plate being provided with at least one third protrusion (421a) along its edge; and a 2b end plate (422), coupled to one side of the 2a end plate (421), the 2b end plate being configured to electrically insulate the battery cell assembly (100) and the 2a end plate (421) from each other.

[0021] In addition, in the battery module according to an embodiment of the present invention, a second fastening hole (421b) can be formed in the 2a end plate (421), a second fastening member (422a) can be provided on the 2b end plate (422), and the 2a end plate (421) and the 2b end plate (422) can be combined with each other through the combination between the second fastening hole (421b) and the second fastening member (422a).

[0022] In addition, in the battery module according to the disclosed embodiment of the present invention, the main body frame (200) may include a first main body frame (210) configured to accommodate the battery cell assembly (100) in the internal space of the first main body frame, the upper portion and both side portions of the first main body frame being open; and a second main body frame (220) disposed at the upper end of the first main body frame (210).

[0023] In addition, in the battery module according to an embodiment of the present invention, a first recess (211) having a portion of its area concave inward may be formed in one end portion of the first main frame (210), a third recess (221a) having a portion of its area concave inward may be formed in one end portion of the second main frame (220), and the first recess (211) and the third recess (221a) may be combined with the second protrusion (411a) through a convex-concave combination.

[0024] In addition, in the battery module according to an embodiment of the present invention, the second main body frame (220) may be provided with an extension portion (221) formed by protruding a middle portion of one end portion thereof, and a third recess (221a) may be formed in the extension portion (221).

[0025] In addition, in the battery module according to an embodiment of the present invention, the second protrusion (411a) can be set to one or more and formed on each side of the 1a end plate (411), and the 1a end plate (411) can be provided with a placement mold (411b) formed by recessing a portion of the edge of its upper portion so that the extension portion (331) is placed thereon.

[0026] In addition, in the battery module according to an embodiment of the present invention, a second recess (212) having a portion of its area concave inward can be formed in the other end of the first main frame (210), and a fourth recess (222) having a portion of its area concave inward can be formed in the other end of the second main frame (220), and the second recess (212) and the fourth recess (222) can be combined with the third protrusion (421a) through a convex-concave combination.

[0027] Furthermore, in the battery module according to the embodiment of the present invention, the third protrusion ( 421 a ) may be provided in one or more and formed on each side of the 2a end plate ( 421 ).

[0028] In addition, in the battery module according to an embodiment of the present invention, a first protrusion (213) in which a portion of the area protrudes upward can be formed at the upper end of the first main frame (210), and a fifth recess (223) in which a portion of the area is recessed inward can be formed in the side surface of the second main frame (220), and the first protrusion (213) and the fifth recess (223) can be combined with each other through a convex-concave combination.

[0029] Furthermore, in a battery module according to an embodiment of the present invention, the bus bar frame (300) may include: a first bus bar frame (310) located on one side of the battery cell assembly (100); and a second bus bar frame (320) located on the other side of the battery cell assembly (100).

[0030] In addition, in the battery module according to an embodiment of the present invention, the first busbar frame (310) may include a module terminal (311) protruding to one side, and the 1b end plate (412) may be provided with a terminal hole (412b) configured to allow the module terminal (311) to pass therethrough.

[0031] Beneficial effects

[0032] As is apparent from the scanned description, the battery module according to the present invention has an advantage in that a main body frame and end plates are coupled to each other by convex-concave coupling, whereby the main body frame and the end plates can be easily assembled.

[0033] In addition, the battery module according to the present invention has an advantage that since the body frame and the end plates are coupled to each other through convex-concave coupling, the coupling position is correct, thereby minimizing deformation of the body frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is an exploded perspective view showing a conventional battery module.

[0035] Figure 2 is a perspective view of a battery module according to an embodiment of the present invention.

[0036] Figure 3 is an exploded perspective view illustrating a battery module according to an embodiment of the present invention.

[0037] Figure 4 is a perspective view illustrating a body frame of a battery module according to an embodiment of the present invention.

[0038] Figure 5 yes Figure 4 The diagram of the binding state of part A is shown in FIG.

[0039] Figure 6 is a perspective view illustrating a state in which a first end plate is coupled to a main body frame in a battery module according to an embodiment of the present invention.

[0040] Figure 7 is an exploded perspective view illustrating a first end plate of a battery module according to an embodiment of the present invention.

[0041] Figure 8 is a perspective view illustrating a state before a first end plate is coupled to a main body frame in a battery module according to an embodiment of the present invention.

[0042] Figure 9 When viewed from the other side Figure 8 A perspective view of the first end plate is shown in FIG.

[0043] Figure 10 yes Figure 6 Magnified views of part B and part C.

[0044] Figure 11 is a perspective view illustrating a state in which a second end plate is coupled to a main body frame in a battery module according to an embodiment of the present invention.

[0045] Figure 12 is an exploded perspective view illustrating a second end plate of a battery module according to an embodiment of the present invention.

[0046] Figure 13 is a perspective view showing a state before a second end plate is coupled to a main body frame in a battery module according to an embodiment of the present invention.

[0047] Figure 14 When viewed from the other side Figure 13 A perspective view of the second end plate is shown in FIG. DETAILED DESCRIPTION

[0048] Now, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the preferred embodiments of the present invention. However, when describing in detail the operating principles of the preferred embodiments of the present invention, when the known functions and configurations incorporated herein may obscure the subject matter of the present invention, their detailed description will be omitted.

[0049] In addition, throughout the drawings, the same reference numerals will be used to refer to parts that perform similar functions or operations. Throughout the specification, when a part is said to be connected to another part, the part may not only be directly connected to the other part, but also be indirectly connected to the other part via the other part. In addition, unless otherwise specified, the inclusion of a predetermined element does not mean the exclusion of other elements, but rather means that such elements may be further included.

[0050] Hereinafter, a battery module according to the present invention will be described.

[0051] Figure 2 is a perspective view of a battery module according to an embodiment of the present invention, and Figure 3 : is an exploded perspective view showing a battery module according to an embodiment of the present invention. Figure 4 is a perspective view showing a main body frame of a battery module according to an embodiment of the present invention, and Figure 5 yes Figure 4 The diagram of the binding state of part A is shown in FIG.

[0052] Reference Figures 2 to 5 , a battery module according to the present invention includes a battery cell assembly 100 , a body frame 200 , a bus bar frame 300 , and an end plate 400 .

[0053] First, the battery cell assembly 100 may include a plurality of battery cells, each of which may be a pouch-type secondary battery including an electrode assembly, an electrode lead, and a battery case.

[0054] The electrode assembly may be: a wound electrode assembly, configured to have a structure in which a long sheet negative electrode and a long sheet positive electrode are wound with a separator interposed between the long sheet negative electrode and the long sheet positive electrode; a stacked electrode assembly, including unit battery cells, each of which is configured to have a structure in which a rectangular positive electrode and a rectangular negative electrode are stacked with a separator interposed between the rectangular positive electrode and the rectangular negative electrode; a stacked folding electrode assembly, configured to have a structure in which a unit battery cell is coated with a long separator; or a laminated stacked electrode assembly, configured to have a structure in which unit battery cells are stacked with a separator interposed therebetween and then attached to each other; however, the present invention is not limited thereto.

[0055] The positive electrode includes a positive electrode current collector and a positive electrode active material coated on each of the upper and lower surfaces of the positive electrode current collector. The positive electrode active material may be mixed with a conductive agent and a binder, and a filler may be further added as needed.

[0056] The negative electrode includes a negative electrode current collector and a negative electrode active material coated on each of the upper and lower surfaces of the negative electrode current collector. The negative electrode active material may be further mixed with a conductive agent and a binder, and the negative electrode current collector may be coated with the mixture.

[0057] The separator prevents short circuits between the negative electrode and the positive electrode and allows only the migration of lithium ions. The separator is preferably made of any one selected from polyethylene, polypropylene, double-layer polyethylene / polypropylene, three-layer polyethylene / polypropylene / polyethylene, three-layer polypropylene / polyethylene / polypropylene, and organic fiber filter paper; however, the present invention is not limited thereto.

[0058] The battery case accommodating the electrode assembly is made of a laminate sheet including an outer cover layer, a metal layer, and an inner cover layer, and has a receiving portion.

[0059] The inner cover layer is in direct contact with the electrode assembly, so it must exhibit high insulation and electrolytic resistance. In addition, the inner cover layer must exhibit high sealing properties to hermetically isolate the battery case from the outside. That is, the thermal bond seal between the inner layers must exhibit excellent thermal bonding strength.

[0060] The inner covering layer can be made of a material selected from polyolefin-based resins (e.g., polypropylene, polyethylene, polyethylene acrylic acid, or polybutylene), polyurethane resins, and polyimide resins that exhibits excellent chemical resistance and high sealing properties; however, the present invention is not limited thereto, and polypropylene that exhibits excellent mechanical properties (e.g., tensile strength, stiffness, surface hardness, and impact resistance) and excellent chemical resistance is most preferably used.

[0061] The metal layer adjacent to the inner cover layer corresponds to a barrier layer configured to prevent moisture or various gases from penetrating into the battery from the outside. A light-weight and easily formable aluminum thin film can be used as a preferred material for the metal layer.

[0062] An outer cover layer is provided on the other surface of the metal layer and may be made of a heat-resistant polymer exhibiting excellent tensile strength, moisture permeability resistance, and air permeability resistance, so that the outer cover layer exhibits high heat resistance and chemical resistance and protects the electrode assembly. As an example, the outer cover layer may be made of nylon or polyethylene terephthalate; however, the present invention is not limited thereto.

[0063] 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 main body frame in which the battery cell assembly 100 is accommodated and an upper portion ( Figure 3 12 o'clock in the middle) and on both sides ( Figure 3 That is, the first main body frame 210 may be a U-shaped frame (U-shaped frame).

[0064] One end portion and the other end portion of the first body frame 210 may be respectively formed with a first concave portion 211 and a second concave portion 212 , a portion of which is concave inward, which will be described in detail later.

[0065] In addition, a first protrusion 213 having a partially recessed area may be formed on the upper end of the first main frame 210. For example, the first protrusion 213 may be formed on a predetermined area of ​​the edge of the upper end of each of a pair of side surfaces supporting both side surfaces of the battery cell assembly 100, such that a portion of the first protrusion protrudes upward.

[0066] Here, preferably, the first protrusion 213 is provided in plurality, and more preferably, the first protrusion is provided in plurality at the upper end of each side surface.

[0067] In addition, the second body frame 220 may be a frame disposed at an upper end of the first body frame 210. That is, the second body frame 220 may be an upper plate disposed at an upper end of the first body frame 210 as a U-shaped frame, and thus the battery cell assembly 100 may be accommodated in an inner space of the body frame 200.

[0068] A third concave portion 221a and a fourth concave portion 222, each of which is partially concave inward, may be formed at one end and the other end of the second main frame 220. The third concave portion 221a may be formed at the middle portion ( Figure 3 The third recess 221a and the fourth recess 222 are respectively formed in the extension portion 221 and the extension portion 221 is formed by protruding (at the 4 o'clock direction in the figure), and the third recess 221a and the fourth recess 222 will be described in detail later.

[0069] In addition, a fifth recess 223 having a portion thereof recessed inwardly may be formed in the side surface of the second main body frame 220. The fifth recess 223 may be coupled to the first protrusion 213 by a convex-concave coupling. Here, the convex-concave coupling may refer to a coupling (connection) achieved by inserting the first protrusion 213 into the fifth recess 223.

[0070] The fifth recess 223 may be formed to correspond to the first protrusion 213 in size and position so that the first protrusion 213 can be inserted into the fifth recess. For example, taking into account construction errors, manufacturing errors, etc., it is preferred that the fifth recess 223 be set so that the size of the fifth recess is larger than the size of the first protrusion 213, taking into account the error range; however, the fifth recess may be set so that the first main frame 210 and the second main frame 220 are aligned in one direction and the other direction ( Figure 2 Movement is restricted in the 4 o'clock and 10 o'clock directions (in the middle).

[0071] When assembled, the first and second body frames 210 and 220 may be prevented from moving in one direction and the other direction.

[0072] The bus bar frame 300 may be electrically connected to the battery cell assembly 100. The bus bar frame 300, which connects a plurality of battery cells included in the battery cell assembly 100 to each other in series and / or in parallel, may be made of a metal material having excellent electrical conductivity, and the width and thickness of the bus bar frame may be appropriately selected based on the structure of the battery module.

[0073] In addition, various methods may be used to electrically connect the bus bar frame 300 and the battery cell assembly 100 to each other.

[0074] The bus bar frame 300 may include a bus bar located at one side of the battery cell assembly 100 ( Figure 3 The first bus bar frame 310 at the 4 o'clock direction in FIG. 1 and the other side of the battery cell assembly 100 ( Figure 3 The second bus bar frame 320 is provided at the 10 o'clock direction in FIG.

[0075] The busbar frame 310 may be provided with a module terminal 311 protruding to one side. The module terminal 311 may connect the battery module to another external component (e.g., another battery module or a battery pack terminal). The module terminal 311 may be a terminal through which charge and discharge current flows to the battery cell assembly 100, and the module terminal 311 may be provided with a positive terminal and a negative terminal.

[0076] The end plates 400 may be combined with both sides of the main body frame 200 .

[0077] The end plate 400 may include a first end plate 410 coupled to one side of the body frame 200 and a second end plate 420 coupled to the other side of the body frame 200 .

[0078] Figure 6 is a perspective view showing a state in which a first end plate is combined with a main body frame in a battery module according to an embodiment of the present invention, Figure 7 is an exploded perspective view illustrating a first end plate of a battery module according to an embodiment of the present invention.

[0079] in addition, Figure 8 is a perspective view showing a state before a first end plate is combined with a main body frame in a battery module according to an embodiment of the present invention, Figure 9 When viewed from the other side Figure 8 A perspective view of the first end plate is shown in FIG. Figure 10 yes Figure 6 Magnified views of part B and part C.

[0080] Reference Figures 2 to 10 The first end plate 410 may include a 1a end plate 411 and a 1b end plate 412. The 1a end plate 411 may be located on one side of the main frame 200 ( Figure 2 4 o'clock in the middle).

[0081] In addition, the 1a end plate 411 may be provided with at least one second protrusion 411a along its edge, and at least one second protrusion 411a may be formed on each side of the 1a end plate 411. For example, at least one second protrusion 411a (preferably, two or more second protrusions 411a) may be formed on each of the four sides of the 1a end plate 411.

[0082] The second protrusion 411a may be coupled to the first recess 211 formed in the first body frame 210 and the third recess 221a formed in the second body frame 220 by convex-concave coupling. For example, at least one first recess 211 may be formed at one end portion (each of three side portions) of each of the three plates constituting the first body frame 210, and at least one third recess 221a may be formed at one end portion (one side portion) of the second body frame 220.

[0083] The first recess 211 and the third recess 221a may be provided to correspond in position and size to the second protrusion 411a. As described above, taking into account construction errors, manufacturing errors, etc., preferably, taking into account the error range, the first recess 211 and the third recess 221a are set so that the size of each of the first recess and the third recess is larger than the size of the second protrusion 411a.

[0084] The 1a end plate 411 may be provided at an upper end portion thereof with a partially recessed seating mold 411b such that the extension 221 formed by protruding a middle portion of one end portion of the second body frame 200 is seated on the seating mold 411b.

[0085] The seating mold 411b may be partially concave to correspond in shape and thickness to the extension 221 and may be further provided with a second protrusion 411a that may be coupled with the third concave portion 221a formed in the extension 221 through convex-concave coupling.

[0086] Therefore, the extension portion 221 is seated on the seating mold 411b, and the second protrusion 411a and the third recess 221a are coupled to each other by convex-concave coupling, whereby the 1a end plate 411 and the second body frame 220 can be more stably connected (coupled) to each other.

[0087] Meanwhile, a first fastening hole 411c may be formed in the 1a end plate 411, and at least one first fastening hole 411c may be formed in a slit shape in the 1a end plate 411. The first fastening hole 411c may be formed for fastening (combining) with the 1b end plate 412.

[0088] The 1b end plate 412 may be located on the other side of the 1a end plate 411, that is, between the 1a end plate 411 and the first busbar frame 310, and may be combined with the 1a end plate 411 to electrically insulate the battery cell assembly 100 from the 1a end plate 411. For example, the 1b end plate 412 may be made of an electrically insulating material, and the material is not particularly limited as long as the material is an insulating material and a heat-resistant material.

[0089] The 1b end plate 412 may be provided with a first fastening member 412a that may be coupled to the first fastening hole 411c of the 1a end plate 411, and the 1a end plate 411 and the 1b end plate 412 may be coupled to each other through the coupling between the first fastening member 412a and the first fastening hole 411c.

[0090] For example, the first fastening member 412a may partially protrude from one surface of the 1b end plate 412 toward one side and may be provided in the form of a hook whose end is bent at a predetermined angle. Here, when the first fastening member 412a is inserted into the first fastening hole 411c, the first fastening member is elastically inserted into the first fastening hole at a predetermined angle.

[0091] At least one first fastening member 412 a may be provided on one surface of the 1 b end plate 412 .

[0092] In addition, the 1b end plate 412 may be provided with a terminal hole 412b for the module terminal 311 of the first busbar frame 310 to pass through. The terminal hole 412b may be configured to expose the module terminal 311 to the outside, so that the module terminal 311 can be exposed to the outside through the terminal hole 412b and electrically connected to other external components.

[0093] Figure 11 is a perspective view showing a state in which a second end plate is coupled to a main body frame in a battery module according to an embodiment of the present invention, Figure 12 : is an exploded perspective view showing a second end plate of a battery module according to an embodiment of the present invention. Figure 13is a perspective view showing a state before the second end plate is combined with the main body frame in the battery module according to the embodiment of the present invention, and Figure 14 When viewed from the other side Figure 13 A perspective view of the second end plate is shown in FIG.

[0094] Reference Figures 2 to 5 and Figure 11 to Figure 1 5. The second end plate 420 may include a 2a end plate 421 and a 2b end plate 422. The 2a end plate 421 may be located on the other side of the main frame 200 ( Figure 2 10 o'clock in the middle).

[0095] In addition, the 2a end plate 421 may be provided with at least one third protrusion 421a along its edge, and at least one third protrusion 421a may be formed on each side of the 2a end plate 421. For example, at least one (e.g., two) third protrusions 421a may be formed on each of the four sides of the 2a end plate 421.

[0096] The third protrusion 421a can be combined with the second recess 212 formed in the first body frame 210 and the fourth recess 222 formed in the second body frame 220 by convex-concave coupling. For example, at least one second recess 212 can be formed at the other end portion (each of the three side portions) of each of the three plates constituting the first body frame 210, and at least one fourth recess 222 can be formed at the other end portion (one side portion) of the second body frame 220.

[0097] The second recess 212 and the fourth recess 222 may be provided to correspond in position and size to the third protrusion 421a. As described above, taking into account construction errors, manufacturing errors, etc., preferably, taking into account the error range, the second recess 212 and the fourth recess 222 are set so that the size of each of the first recess and the third recess is larger than the size of the third protrusion 421a.

[0098] The 2a end plate 421 can be provided with a partially concave placement mold (not shown) at its upper end so that the other end of the second main frame 200 is placed thereon, and the placement mold (not shown) can also be provided with a third protrusion 421a that can be combined with the fourth recess 222 through a convex-concave combination.

[0099] Meanwhile, a second fastening hole 421b may be formed in the 2a end plate 421, and at least one second fastening hole 421b may be formed in a slit shape in the 2a end plate 421. The second fastening hole 421b may be formed for fastening (combining) with the 2b end plate 422.

[0100] The 2b end plate 422 may be disposed on one side of the 2a end plate 421, that is, between the 2a end plate 421 and the second busbar frame 320, and may be combined with the 2a end plate 421 to electrically insulate the battery cell assembly 100 from the 2a end plate 411. For example, the 2b end plate 422 may be made of the same material as the 1b end plate 412.

[0101] The 2b end plate 422 may be provided with a second fastening member 422a that may be coupled to the second fastening hole 421b of the 2a end plate 421, and the 1a end plate 421 and the 2b end plate 422 may be coupled to each other through the coupling between the second fastening member 422a and the second fastening hole 421b.

[0102] For example, the second fastening member 422a may partially protrude from the other surface of the 2b end plate 422 toward the other side and may be provided in the form of a hook with an end bent at a predetermined angle. Here, when the second fastening member 422a is inserted into the second fastening hole 421b, the second fastening member is elastically inserted into the second fastening hole at a predetermined angle.

[0103] At least one second fastening member 422 a may be provided on the other surface of the 2 b end plate 422 .

[0104] As described above, in the battery module according to the present invention, the first end plate 410 and the second end plate 420 can be respectively combined with one side and the other side of the main frame 200 by convex-concave combination. Therefore, the up and down movement of the first end plate 410 and the second end plate 420 relative to the first main frame 210 can be minimized ( Figure 2 6 o'clock direction and 12 o'clock direction in the middle) and the left and right movement of the first end plate and the second end plate relative to the second main body frame 220 ( Figure 2 Of course, when assembling or pressing the main frame 200 and the end plate 400, deformation of the components is minimized, thereby improving assembly position accuracy.

[0105] Although the specific details of the present invention have been described in detail, it will be understood by those skilled in the art that the detailed description thereof only discloses the preferred embodiments of the present invention and therefore does not limit the scope of the present invention. Therefore, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the category and technical ideas of the present invention, and it is obvious that such changes and modifications fall within the scope of the appended claims.

[0106] (Explanation of Reference Numerals)

[0107] 100: Battery cell assembly

[0108] 200: Main frame

[0109] 210: First main frame

[0110] 211: First concave portion 212: Second concave portion

[0111] 213: First protrusion

[0112] 220: Second main frame

[0113] 221: Extended portion 221a: Third recessed portion

[0114] 222: The fourth concave part

[0115] 223: The fifth recess

[0116] 300: Busbar frame

[0117] 310: First busbar frame 311: Module terminal

[0118] 320: Second busbar frame

[0119] 400: End plate

[0120] 410: First end plate

[0121] 411:1a end plate

[0122] 411a: Second protrusion 411b: Mold placement

[0123] 411c: First fastening hole

[0124] 412:1b end plate

[0125] 412a: First fastening member 412b: Terminal hole

[0126] 420: Second end plate

[0127] 421:2a end plate

[0128] 421a: third protrusion 421b: second fastening hole

[0129] 422: 2b end plate 422a: second fastening member

Claims

1. A battery module comprising: A battery cell assembly, comprising a plurality of battery cells; a main body frame configured to accommodate the battery cell assembly in an inner space thereof; a busbar frame electrically connected to the battery cell assembly; as well as End plates, combined with one side or the other side of the main frame, Wherein, the main frame and the end plate are combined with each other through convex-concave combination.

2. The battery module according to claim 1, wherein: The end plate comprises: a first end plate coupled to the one side of the main frame; and The second end plate is combined with the other side of the main frame.

3. The battery module according to claim 2, wherein: The first end plate comprises: 1a end plate, located on the one side of the main frame, the end plate 1a being provided with at least one second protrusion along an edge thereof; and The end plate 1b is combined with the other side of the end plate 1a, and the end plate 1b is configured to electrically insulate the battery cell assembly from the end plate 1a.

4. The battery module according to claim 3, wherein: A first fastening hole is formed in the 1a end plate, a first fastening member is provided on the 1b end plate, and the 1a end plate and the 1b end plate are coupled to each other through coupling between the first fastening hole and the first fastening member.

5. The battery module according to claim 3, wherein: The second end plate comprises: 2a end plate, located at the other side of the main frame, the 2a end plate being provided with at least one third protrusion along an edge thereof; and The 2b end plate is coupled to one side of the 2a end plate, and the 2b end plate is configured to electrically insulate the battery cell assembly from the 2a end plate.

6. The battery module according to claim 5, wherein: A second fastening hole is formed in the 2a end plate, a second fastening member is provided on the 2b end plate, and the 2a end plate and the 2b end plate are coupled to each other through coupling between the second fastening hole and the second fastening member.

7. The battery module according to claim 5, wherein: The main framework includes: a first body frame configured to accommodate the battery cell assembly in an inner space of the first body frame, the upper portion and both sides of the first body frame being open; and The second main frame is arranged on the upper end of the first main frame.

8. The battery module according to claim 7, wherein: A first recessed portion having a portion recessed inward is formed in one end portion of the first main frame. A third recessed portion having a portion recessed inward is formed in one end portion of the second main body frame, and The first concave portion and the third concave portion are combined with the second protrusion through a convex-concave combination.

9. The battery module according to claim 8, wherein: The second main body frame is provided with an extension portion formed by protruding a middle portion of one end portion thereof, and The third recess is formed in the extending portion.

10. The battery module according to claim 9, wherein: The second protrusion is provided in one or more pieces and is formed on each side of the end plate 1a, and The end plate 1a is provided with a seating mold formed by recessing a portion of an edge of an upper portion thereof, so that the extension portion is seated on the seating mold.

11. The battery module according to claim 7, wherein: A second recessed portion having a portion thereof recessed inwardly is formed in the other end portion of the first main body frame. A fourth recessed portion having a portion recessed inward is formed in the other end portion of the second main body frame, and The second concave portion and the fourth concave portion are combined with the third protrusion through a convex-concave combination.

12. The battery module according to claim 11, wherein: The third protrusion is provided in one or more portions and is formed on each side of the end plate 2a.

13. The battery module according to claim 7, wherein: The upper end of the first main frame is formed with a first protrusion with a portion of the area protruding upward. A fifth recessed portion is formed in the side surface of the second main body frame, a portion of which is recessed inwardly, and The first protrusion and the fifth recess are coupled to each other through a convex-concave coupling.

14. The battery module according to claim 2, wherein: The busbar frame comprises: a first bus bar frame located on one side of the battery cell assembly; and The second bus bar frame is located on the other side of the battery cell assembly.

15. The battery module according to claim 11, wherein: The first busbar frame includes a module terminal protruding to one side, and The 1b end plate is provided with terminal holes configured so that the module terminals can pass therethrough.

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