Battery cell assembly and method for disassembling insulation cover of battery cell assembly

Abstract

A battery cell assembly disclosed herein comprises: a plurality of battery cells stacked in a first direction; a busbar frame assembly electrically connected to the plurality of battery cells, and including at least one hook; an insulation cover covering the busbar frame assembly, and including at least one coupling hole; and a side beam disposed on the outermost side of the plurality of battery cells in the first direction.

Description

Method for disassembling a battery cell assembly and an insulating cover of a battery cell assembly

[0001] The present invention relates to a battery cell assembly and a method for disassembling an insulating cover of a battery cell assembly, and more specifically, to a battery cell assembly and a method for disassembling an insulating cover of a battery cell assembly in which the assembly and disassembly of the insulating cover are easy.

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2024-0192301 dated December 20, 2024, and all contents disclosed in the document of said Korean patent application are incorporated herein as part of this specification.

[0003] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. Secondary batteries are widely used as energy sources for various wireless devices such as handsets, laptops, and cordless vacuum cleaners. Recently, as the manufacturing cost per unit capacity of secondary batteries has decreased dramatically due to improved energy density and economies of scale, and as the driving range of BEVs (battery electric vehicles) has increased to a level equivalent to that of fuel vehicles, the primary use of secondary batteries is shifting from mobile devices to mobility.

[0004] The trend in the technological development of secondary batteries for mobility is the improvement of energy density and safety. The safety of secondary batteries for mobility is critical as it is directly related to the lives of passengers. The safety of secondary batteries can be achieved through mechanical robustness, the reliability of electrical insulation, and the delay of heat transfer in the event of a thermal runaway event.

[0005] In addition, a high yield is required to maximize the production efficiency of secondary batteries.

[0006] The first problem that the technical concept of the present disclosure aims to solve is to provide a battery cell assembly that adopts a structure with high yield.

[0007] The second problem that the technical concept of the present disclosure aims to solve is to provide a method for disassembling an insulation cover of an efficient battery cell assembly.

[0008] However, the technical problems that the present invention aims to solve are not limited to those described above, and other unmentioned problems will be clearly understood by a person skilled in the art from the description of the invention below.

[0009] The present disclosure relates to a battery cell assembly, wherein in one embodiment, a plurality of battery cells stacked in a first direction; a busbar frame assembly electrically connected to the plurality of battery cells and having at least one hook; an insulating cover covering the busbar frame assembly and having at least one fastening hole; and a side beam disposed at the outermost edge of the plurality of battery cells in the first direction.

[0010] In some embodiments, the side beam may have a slot hole in an area corresponding to the at least one fastening hole.

[0011] In some embodiments, the size of the slot hole may decrease in the direction of the at least one fastening hole.

[0012] In some embodiments, the side beam may have a connecting member on the outer surface of the side beam. A battery cell assembly characterized in that the corner of the connecting member includes a chamfered shape that is cut obliquely.

[0013] In some embodiments, the busbar frame assembly may extend in the first direction.

[0014] In some embodiments, the at least one hook may protrude from the side of the busbar frame assembly. The normal direction of the side may be the first direction.

[0015] In some embodiments, the at least one hook and the at least one fastening hole may be fastened based on a snap-fit.

[0016] In some embodiments, the thickness of the at least one hook may increase toward the direction of the plurality of battery cells.

[0017] In some embodiments, the at least one hook may include a structure that slopes toward the plurality of battery cells.

[0018] In some embodiments, the at least one hook may include plastic.

[0019] In some embodiments, the plastic may include at least one of ABS (Acrylonitrile Butadiene Styrene), polycarbonate, polypropylene, nylon, and PBT (Polybutylene Terephthalate).

[0020] In some embodiments, the at least one fastening hole may protrude from the insulating cover toward the plurality of battery cells.

[0021] The present disclosure relates to a method for disassembling an insulating cover of a battery cell assembly described above, comprising the steps of: pressing the at least one hook in the direction of the busbar frame assembly; and moving the insulating cover in the opposite direction of the busbar frame assembly.

[0022] In some embodiments, the side beam may have a slot hole in an area corresponding to the at least one fastening hole. The step of pressing the at least one hook toward the busbar frame assembly may be to press the at least one hook toward the busbar frame assembly by penetrating the slot hole.

[0023] In some embodiments, the size of the slot hole may decrease as it approaches the direction of the fastening hole.

[0024] In some embodiments, the side beam may be provided with a connecting member on the outer surface of the side beam. The corner of the connecting member may include a chamfered shape that is cut obliquely.

[0025] The yield of the battery cell assembly of the present disclosure having the above-described configuration can be improved.

[0026] The battery cell assembly of the present disclosure may be easy to assemble and disassemble.

[0027] The method for disassembling the insulating cover of a battery cell assembly of the present disclosure can improve the productivity of the battery cell assembly by providing an easy method for disassembling the insulating cover when an event occurs during the manufacturing process of the battery cell assembly.

[0028] However, the technical effects obtainable through the present disclosure are not limited to those described above, and other unmentioned effects will be clearly understood by a person skilled in the art from the description of the invention below.

[0029] The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings.

[0030] FIG. 1 is a perspective view of a battery cell assembly according to one embodiment of the present disclosure.

[0031] FIG. 2 is a perspective view of a battery cell assembly according to one embodiment of the present disclosure.

[0032] FIG. 3 is a perspective view including a cross-section of region A in the battery cell assembly of FIG. 2.

[0033] FIG. 4 is a perspective view showing area B of the battery cell assembly of FIG. 2.

[0034] FIG. 5 is an exploded perspective view of a battery cell assembly according to one embodiment of the present disclosure.

[0035] FIG. 6 is a perspective view in which the side beam of a battery cell assembly according to one embodiment of the present disclosure is disassembled.

[0036] FIG. 7 is a flowchart illustrating a method of assembling a battery cell assembly according to one embodiment of the present disclosure.

[0037] FIG. 8 is a flowchart illustrating a method for disassembling an insulating cover of a battery cell assembly according to one embodiment of the present disclosure.

[0038] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, and should be interpreted in a meaning and concept consistent with the technical spirit of the present invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention.

[0039] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention; thus, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0040] In addition, in describing the present invention, if it is determined that a detailed description of related known components or functions may obscure the essence of the invention, such detailed description is omitted.

[0041] Since embodiments of the present invention are provided to more fully explain the invention to those skilled in the art, the shapes and sizes of the components in the drawings may be exaggerated, omitted, or schematically depicted for clearer explanation. Accordingly, the size or proportion of each component does not entirely reflect the actual size or proportion.

[0042]

[0043] [First and second embodiments]

[0044] FIG. 1 is a perspective view of a battery cell assembly according to one embodiment of the present disclosure. FIG. 2 is a perspective view of a battery cell assembly according to one embodiment of the present disclosure. FIG. 3 is a perspective view including a cross-section of region A in the battery cell assembly of FIG. 2. FIG. 4 is a perspective view showing region B of the battery cell assembly of FIG. 2. FIG. 5 is an exploded perspective view of a battery cell assembly according to one embodiment of the present disclosure. FIG. 6 is a perspective view with the side beam of the battery cell assembly according to one embodiment of the present disclosure disassembled.

[0045] Referring together to FIGS. 1 to 4, a battery cell assembly (100) according to one embodiment of the present disclosure includes a plurality of battery cells (110), side beams (120) covering both sides of the plurality of battery cells (110), a busbar frame assembly (140) electrically connected to electrode leads protruding from the plurality of battery cells (110), and an insulating cover (130) covering the busbar frame assembly (140).

[0046] In some embodiments, the battery cell assembly (100) may include a plurality of battery cells (110) stacked in a first direction, a busbar frame assembly (140) electrically connected to the plurality of battery cells (110) and having at least one hook (141), an insulating cover (130) covering the busbar frame assembly (140) and having at least one fastening hole (131), and a side beam (120) disposed at the outermost edge of the plurality of battery cells (110) in the first direction. Referring to FIG. 1 and FIG. 2 together, the first direction may be the X direction.

[0047] In some embodiments, at least one hook (141) may include an upper hook (141_1) and a lower hook (141_2). In some embodiments, at least one fastening hole (131) may include an upper fastening hole (131_1) and a lower fastening hole (131_2). Referring to FIGS. 3 through 6, only a part of the battery cell assembly (100) is shown, but the insulating cover positioned opposite the battery cell (110) from the insulating cover (130, 130') may include an upper fastening hole and a lower fastening hole, and the busbar frame assembly positioned opposite the battery cell (110) from the busbar frame assembly (140) may also include an upper hook and a lower hook. Referring to FIGS. 4 and 5, the shape of the upper outer surface of the insulating cover (130) and the insulating cover (130') may be different from each other. The upper surface of the outer surface of the insulating cover (130') may be flat. The shape of the outer surface of the insulating cover (130, 130') is not limited to the embodiments and may vary.

[0048] A battery cell assembly (100) refers to a collection of battery cells in which a plurality of battery cells (110) are structurally and electrically connected. Depending on the way the plurality of battery cells (110) are structurally connected, the battery cell assembly (100) may be referred to by various terms such as a battery module, a battery block, or a battery unit.

[0049] Each of the plurality of battery cells (110) may be a lithium-ion battery. Each of the plurality of battery cells (110) includes an electrode assembly, an electrolyte, and a case. Each of the plurality of battery cells (110) may be any one of a cylindrical battery cell, a prismatic battery cell, and a pouch-type battery cell. The electrode assembly of the cylindrical battery cell is embedded in a cylindrical metal can. The electrode assembly of the prismatic battery cell is embedded in a prismatic metal can. The electrode assembly of the pouch-type battery cell is embedded in a pouch case containing an aluminum laminate sheet.

[0050] In some embodiments, each of the plurality of battery cells (110) may be a lithium-ion battery, a lithium-ion polymer battery, or a lithium-polymer battery.

[0051] In some embodiments, the electrode assembly may include an anode, a cathode, and a separator interposed between the anode and the cathode. In some embodiments, the electrode assembly may be either a jelly-roll type or a stack type. In some embodiments, the jelly-roll type electrode assembly may include a wound structure of an anode, a cathode, and a separator interposed between them. In some embodiments, the stack type electrode assembly may include a plurality of anodes, a plurality of cathodes, and a plurality of separators interposed between them, which are sequentially stacked.

[0052] In some embodiments, the side beams (120) can protect the battery cell assembly (100) from external shock, heat, vibration, etc. The side beams (120) may be manufactured based on an extrusion process. The side beams (120) may include a first side beam (120_1) and a second side beam (120_2). The first and second side beams (120_1, 120_2) may be spaced apart in the X direction. A plurality of battery cells (110) may be located between the first and second side beams (120_1, 120_2). The side beams (120_1, 120_2) may horizontally support the plurality of battery cells (110). The first and second side beams (120_1, 120_2) may cover the plurality of battery cells (110). The first and second side beams (120_1, 120_2) can be fixed to a plurality of battery cells (110). In some embodiments, the first and second side beams (120_1, 120_2) can be fixed to a plurality of battery cells (110) by an adhesive or double-sided tape. Referring to FIG. 3, in some embodiments, the first and second side beams (120_1, 120_2) can be fixed to a plurality of battery cells (110) by an adhesive applied to a plate member located between each of the plurality of battery cells (110) and the side beams (120_1, 120_2) or by double-sided tape attached thereto. In some embodiments, each of the first and second side beams (120_1, 120_2) may comprise metal.

[0053] In some embodiments, the side beam (120) may have a slot hole (121) in an area corresponding to at least one fastening hole (131). The slot hole (121) may include upper slot holes (121_1, 121_3) and lower slot holes (121_2, 121_4). In some embodiments, the fastening hole (131) may protrude from the insulating cover (130) toward a plurality of battery cells (110).

[0054] According to some embodiments, the side beams (120_1, 120_2) may have the same shape. For example, referring to FIG. 2, the side beams (120_1, 120_2) may have a connecting member (122) at the same height. The side beams (120_1, 120_2) may include a connecting member (122) provided from the top of the side beams (120_1, 120_2) down to a certain height below. As a specific example, the side beams (120_1, 120_2) may include a connecting member (122) provided from the top of the side beams (120_1, 120_2) down to a height between the upper slot holes (121_1, 121_3) and the lower slot holes (121_2, 121_4). According to some embodiments, the side beams (120_1, 120_2) may be arranged symmetrically.

[0055] According to some embodiments, the side beams (120_1, 120_2) may have different shapes. For example, referring to FIG. 1, the first side beam (120_1) may not include a connecting member (122), and the second side beam (120_2) may include a connecting member (122). As another example, the first side beam (120_1) may include a connecting member (122) provided from the top of the first side beam (120_1) down to a certain height, and the second side beam (120_2) may include a connecting member provided from the bottom of the second side beam (120_2) up to a certain height.

[0056] The busbar frame assembly (140) may include a busbar frame (143) and a busbar. The busbar may be connected to the electrode leads of the battery cell assemblies (100) to electrically connect the battery cell assemblies (100) to each other. The busbar may be placed on the busbar frame (143). Meanwhile, the busbar plate may be placed adjacent to the electrode leads. The electrode leads of the battery cell assemblies (100) may be configured to pass through a slit formed in the busbar plate to be electrically connected to the busbar. The busbar frame (143) and the busbar plate may include an insulating material such as a non-conductive synthetic resin. The busbar may include a conductive material such as metal.

[0057] In some embodiments, the busbar frame assembly (140) may extend in a first direction (e.g., X direction). The at least one hook (141) may protrude from the side of the busbar frame assembly (140). In some embodiments, the at least one hook (141) may protrude from the busbar frame (143). The normal direction of the side of the busbar frame assembly (140) may be the first direction (X direction). In some embodiments, the normal direction of the side of the busbar frame (143) may be the first direction.

[0058] Each of the plurality of battery cells (110) may include an electrode lead. The electrode lead may include a positive lead and a negative lead. Each electrode assembly of the plurality of battery cells (110) may be connected to the positive lead and the negative lead. Each electrode lead of the plurality of battery cells (110) may have a curved shape. Each electrode lead of the plurality of battery cells (110) may come into contact with the electrode lead of an adjacent battery cell. The electrode leads in contact with each other may be fixed to each other by welding or the like. The electrode leads of the plurality of battery cells (110) may be aligned in one direction. Due to contact between the electrode leads of different battery cells (110), the plurality of battery cells (110) may be electrically connected to each other. The plurality of battery cells (110) may be connected in series or in parallel.

[0059] Multiple battery cells (110) may form multiple banks. Each of the multiple banks may include one or more battery cells (110). One or more battery cells (110) of each of the multiple banks may be connected in parallel with each other. Multiple banks may be connected in series with each other. The number of series-connected banks and the number of battery cells (110) included in the multiple banks may be determined according to the magnitude of the voltage and current to be output from each of the battery cell assemblies (100).

[0060] In some embodiments, the insulating cover (130, 130') may be a protective member for reinforcing electrical insulation, impact resistance, wear resistance, etc., for the busbar frame assembly (140). The insulating cover (130, 130') may also be referred to as a busbar frame cover.

[0061] In some embodiments, the side beam (120) may have a slot hole (121) in an area corresponding to the at least one fastening hole (131). The slot hole (121) may include upper slot holes (121_1, 121_3) and lower slot holes (121_2, 121_4).

[0062] In some embodiments, the size of the slot hole (121) may decrease as it moves toward the fastening hole (131). Referring to FIG. 3, for example, the size of the lower slot hole (121_1) may decrease as it moves toward the X direction. Accordingly, the disassembly device of the insulating cover (130) of the battery cell assembly (100) is guided to press the lower hook (141_2) of the busbar frame assembly (140) more smoothly. Additionally, the disassembly device of the battery cell assembly (100) can disassemble the insulating cover (130) even if it slightly misjudges the position of the lower hook (141_2).

[0063] Referring together to FIGS. 2 to 6, in some embodiments, the side beam (120) may be provided with a connecting member (122) on the outer surface of the side beam (120). The corner of the connecting member (122) may include a chamfered shape that is cut at an angle. Accordingly, the dismantling equipment of the insulating cover (130) of the battery cell assembly (100) can easily press the hook (141) of the busbar frame assembly (140) through the slot hole (121) of the side beam (120).

[0064] In some embodiments, at least one hook (141) and at least one fastening hole (131) may be fastened based on a snap-fit. In some embodiments, the thickness of the at least one hook (141) may increase toward the direction of the plurality of battery cells (110). In some embodiments, the at least one hook (141) may include a structure that slopes toward the direction of the plurality of battery cells (110).

[0065] Referring to FIG. 3, the lower hook (141_2) and the lower fastening hole (131_2) can be fastened based on a snap-fit. That is, when the lower hook (141_2) and the lower fastening hole (131_2) are disassembled, and the insulating cover (130) moves toward the battery cell (110) (-Y direction), the lower hook (141_2) can retract in the X direction due to the inclined structure of the lower hook (141_2) and the elasticity of the lower hook (141_2). That is, as the lower fastening hole (131_2) pushes the lower hook (141_2), the lower hook (141_2) retracts in the X direction, and the lower fastening hole (131_2) can advance toward the battery cell (110) (-Y direction). When the lower fastening hole (131_2) is fully advanced in the direction of the battery cell (110) (-Y direction), it can be restored back to the -X direction due to the restoring force of the lower hook (141_2). Thus, the lower hook (141_2) and the lower fastening hole (131_2) can be fastened based on a snap-fit.

[0066] At least one hook (141) may comprise a material having elasticity and / or restoring force. In some embodiments, at least one hook (141) may comprise plastic. The plastic may comprise at least one of ABS (acrylonitrile butadiene styrene), polycarbonate, polypropylene, nylon, and PBT (polybutylene terephthalate).

[0067] Referring to FIGS. 4 and 5, the busbar frame assembly (140) may include a protrusion (142). The protrusion (142) may include an upper protrusion (142_1) and a lower protrusion (142_2). In some embodiments, the busbar frame (143) may include the protrusion (142). The side beam (120) may include a fixing hole (123). The fixing hole (123) may include an upper fixing hole (123_1) and a lower fixing hole (123_2). The protrusion (142) of the busbar frame assembly (140) may penetrate the fixing hole (123) of the side beam (120). The protrusion (142) may include a cross shape. When the insulating cover (130') moves toward the battery cell (110) so that the fastening hole (131) of the insulating cover (130') is fastened to the hook (141) of the busbar frame assembly (140), the insulating cover (130') may have a shape that does not come into contact with the protrusion (142) of the busbar frame (143). For example, the insulating cover (130') may have a concave shape in the opposite direction of the battery cell (110) at the same height as the protrusion (142) of the busbar frame (143). In some embodiments, the battery cell assembly (100) may further include a cap that is coupled to the protrusion (142) penetrating the fixing hole (123). By the cap being coupled to the protrusion (142), the fixing force of the side beam (120) may be enhanced. The positions of the protrusion (142) and the slot hole (121) may vary.

[0068]

[0069] [3rd and 4th embodiments]

[0070] FIG. 7 is a flowchart illustrating a method of assembling a battery cell assembly according to one embodiment of the present disclosure. FIG. 8 is a flowchart illustrating a method of disassembling an insulating cover of a battery cell assembly according to one embodiment of the present disclosure. FIG. 7 and FIG. 8 may be described with reference to FIG. 1 to 6, and redundant descriptions may be omitted below.

[0071] Referring to FIG. 7, in step S101, the insulating cover (130, 130') can be moved toward the busbar frame assembly (140). In some embodiments, the insulating cover (130, 130') can be moved toward the busbar frame assembly (140) while the side beam (120) remains fixed to the battery cell (110). In some embodiments, the assembly device of the insulating cover (130) can move the flat inner surface of the insulating cover (130, 130') toward the busbar frame assembly (140) after the hook (141) and the fastening hole (131) are positioned at the same height.

[0072] In step S103, the hook (141) of the busbar frame assembly (140) and the fastening hole (131) of the insulating cover (130) can be fastened based on the elasticity of the hook (141) of the busbar frame assembly (140).

[0073] Referring to FIG. 8, in step S201, a hook (141) of the busbar frame assembly (140) may be pressed toward the busbar frame assembly (140). In some embodiments, the disassembly device of the insulating cover (130, 130') may penetrate the slot hole (121) and press at least one hook (141) toward the busbar frame assembly (140). In some embodiments, the disassembly device of the insulating cover (130, 130') may be the same device as the assembly device of the insulating cover (130).

[0074] In step S203, the insulating cover (130, 130') may be moved in the opposite direction of the busbar frame assembly (140). In some embodiments, the dismantling device of the insulating cover (130, 130') may be dismantled from the battery cell assembly (100) while moving the insulating cover (130, 130') in the opposite direction of the busbar frame assembly (140) while pressing one hook (141) toward the busbar frame assembly (140). In some embodiments, the side beam (120) may be dismantled while the insulating cover (130, 130') is moved in the opposite direction of the busbar frame assembly (140) while the side beam (120) remains fixed to the battery cell (110). Since the fastening area of ​​the hook (141) of the busbar frame assembly (140) and the fastening hole (131) of the insulating cover (130, 130') corresponds to the slot hole (121) area of ​​the side beam (120), the insulating cover (130, 130') can be removed from the battery cell assembly (100) without interference from the side beam (120).

[0075] The present invention has been described in more detail above through drawings and embodiments. However, the configurations described in the drawings or embodiments described in this specification are merely one embodiment of the present invention and do not represent all technical concepts of the present invention; therefore, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

Claims

1. A plurality of battery cells stacked in a first direction; A busbar frame assembly electrically connected to the plurality of battery cells and having at least one hook; An insulating cover that covers the above busbar frame assembly and has at least one fastening hole; and A battery cell assembly comprising: a side beam disposed at the outermost edge of the first direction of the plurality of battery cells.

2. In Paragraph 1, A battery cell assembly characterized in that the side beam has a slot hole in an area corresponding to the at least one fastening hole.

3. In Paragraph 2, A battery cell assembly characterized in that the size of the slot hole decreases as it moves toward the direction of the at least one fastening hole.

4. In Paragraph 1, The above side beam is, A connecting member is provided on the outer surface of the above side beam, and A battery cell assembly characterized in that the corners of the above-mentioned connecting member include a beveled chamfered shape.

5. In Paragraph 1, The above busbar frame assembly extends in the first direction, and The above at least one hook protrudes from the side of the busbar frame assembly, and A battery cell assembly characterized in that the normal direction of the above-mentioned side is the above-mentioned first direction.

6. In Paragraph 1, A battery cell assembly characterized in that the at least one hook and the at least one fastening hole are fastened based on a snap-fit.

7. In Paragraph 1, The above at least one hook is, A battery cell assembly characterized by the thickness increasing toward the direction of the plurality of battery cells.

8. In Paragraph 1, The above at least one hook is, A battery cell assembly characterized by including a structure that slopes toward the direction of the plurality of battery cells.

9. In Paragraph 1, The above at least one hook is, A battery cell assembly characterized by including plastic.

10. In Paragraph 9, The above plastic is, A battery cell assembly characterized by comprising at least one of ABS (Acrylonitrile Butadiene Styrene), polycarbonate, polypropylene, nylon, and PBT (Polybutylene Terephthalate).

11. In Paragraph 1, The above-mentioned at least one fastening hole is, A battery cell assembly characterized by protruding from the insulating cover toward the plurality of battery cells.

12. In the method of disassembling the insulating cover of the battery cell assembly of claim 1, A step of pressing the above-mentioned at least one hook in the direction of the busbar frame assembly; and A method for disassembling an insulating cover of a battery cell assembly, comprising the step of moving the insulating cover in the opposite direction of the busbar frame assembly.

13. In Paragraph 12, The above side beam has a slot hole in an area corresponding to the at least one fastening hole, and A method for disassembling an insulating cover of a battery cell assembly, wherein the step of pressing the at least one hook in the direction of the busbar frame assembly is characterized by pressing the at least one hook in the direction of the busbar frame assembly through the slot hole.

14. In Paragraph 13, A method for disassembling an insulating cover of a battery cell assembly, characterized in that the size of the slot hole decreases as it moves toward the fastening hole.

15. In Paragraph 12, The above side beam is, A connecting member is provided on the outer surface of the above side beam, and A method for disassembling an insulating cover of a battery cell assembly, characterized in that the corners of the above-mentioned connecting member include a beveled chamfer shape.

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