Battery module and manufacturing method thereof

Abstract

The present invention relates to a battery module and a method for manufacturing the same, the battery module reducing the possibility of cell case damage even if a cell expands due to a gas generated inside the cell as the time increases, thereby having improved safety, thereby having an extended life. The battery module according to the present invention may comprise: a cell stack having a form in which a plurality of cell stacks are stacked; a frame in which the battery cell stack is accommodated; a binder resin provided between a bottom surface of the cell stack and the frame such that the cell stack is bonded to the frame; and a film provided between a portion of a bottom surface of the cell stack and the adhesive resin such that an adhesive force between the portion of the cell stack and the adhesive resin is reduced.

Description

Technical Field

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2022-0064230 filed on May 25, 2022 and Korean Patent Application No. 10-2023-0031429 filed on March 9, 2023, which are hereby incorporated by reference in their entirety. Technical Field

[0004] The present invention relates to a battery module and a method of manufacturing the same, and more particularly, to a battery module including a plurality of secondary batteries and a method of manufacturing the same. Background Art

[0005] In recent years, as energy prices have risen due to the depletion of fossil fuels, concerns about environmental pollution have been amplified, and the demand for environmentally friendly alternative energy is becoming an indispensable factor in future life. Therefore, research on various power generation technologies such as solar energy, wind energy, and tidal energy has been ongoing, and energy storage devices such as batteries for more efficiently utilizing the generated electrical energy have also attracted attention.

[0006] In addition, as the technology of electronic mobile devices and electric vehicles using batteries develops and the demand increases, the demand for batteries as energy sources is rapidly increasing. Therefore, many studies have been conducted on batteries that can meet various demands.

[0007] Generally, batteries that store electrical energy can be divided into primary batteries and secondary batteries. Such primary batteries are disposable consumable batteries. On the other hand, such secondary batteries are rechargeable batteries manufactured by using materials that can repeatedly perform redox processes between electric current and materials. That is, when a reduction reaction is performed on the material by electric current, charging is performed. When an oxidation reaction is performed on the material by electric current, discharging is performed. This charge-discharge is repeated to generate electricity.

[0008] As the demand for large-capacity structures in addition to use as energy storage sources is increasing, the demand for battery packs in which a plurality of secondary batteries or battery modules are aggregated is also increasing, and thus the demand for battery modules is also increasing.

[0009] As the usage time of the battery module increases, a swelling phenomenon may occur in which gas is generated inside the unit secondary batteries constituting the battery module and thus the secondary batteries swell.

[0010] In a battery module according to the related art, a certain portion of a secondary battery is torn or damaged due to swelling.

[0011] In order to solve this problem, a battery module is required in which internal secondary batteries are not damaged even when a swelling phenomenon occurs. Summary of the invention

[0012] Technical issues

[0013] The present invention is made to solve the above problems, and an object of the present invention is to provide a battery module and a manufacturing method thereof, which can improve the stability of the battery module by reducing the possibility of damage to the battery cells even if the internal battery cells expand as the battery module is used for an extended period of time.

[0014] Technical Solution

[0015] According to a battery module of the present invention, the battery module includes: a cell stack, the cell stack having a shape of stacked multiple cells; a frame, in which the cell stack is accommodated; an adhesive resin, the adhesive resin is arranged between the bottom surface of the cell stack and the frame, so that the cell stack is adhered to the frame; and a film, the film is arranged between a portion of the bottom surface of the cell stack and the adhesive resin, so that the adhesive force between the portion of the cell stack and the adhesive resin is reduced.

[0016] The film may cover both edges of the bottom surface of the cell stack in a longitudinal direction.

[0017] The film may extend in a direction in which the plurality of battery cells are stacked.

[0018] The battery cell may include a pouch on which a sealing portion is provided, and a width of the film in a direction perpendicular to a direction in which the plurality of battery cells are stacked may be 4 mm or more to 6 mm or less greater than a width of the sealing portion.

[0019] The sealing portion may include a deformable portion protruding toward the adhesive resin, and a width of the film in a direction perpendicular to a direction in which the plurality of battery cells are stacked may be 4 mm or more to 6 mm or less greater than a width of the deformable portion.

[0020] The film is bent so that both ends of the film can be disposed on side surfaces of the cell stack.

[0021] The film may have adhesive force only at both end portions disposed on side surfaces of the cell stack.

[0022] The film may include polyethylene terephthalate.

[0023] The film may be a thermally conductive film.

[0024] A method for manufacturing a battery module, the method may include: a film placement process of setting a film on a portion of a bottom surface of a battery cell stack; a resin placement process of setting an adhesive resin between the bottom surface of the battery cell stack and a frame; and an insertion process of inserting the battery cell stack into the frame.

[0025] In the film placement process, the film may be disposed to cover both edges of the bottom surface of the cell stack in a longitudinal direction.

[0026] In the resin placement process, the adhesive resin may be applied on a bottom surface of the frame so that the adhesive resin is disposed between the bottom surface of the cell stack and the frame.

[0027] In the resin placement process, the adhesive resin is injected through a hole formed in a bottom surface of the frame so that the adhesive resin is disposed between the bottom surface of the cell stack and the frame.

[0028] Beneficial Effects

[0029] A battery module according to the present invention may include: a cell stack having a shape of stacked multiple cells; a frame in which the cell stack is accommodated; an adhesive resin, which is arranged between a bottom surface of the cell stack and the frame so that the cell stack is adhered to the frame; and a film, which is arranged between a portion of the bottom surface of the cell stack and the adhesive resin so that the adhesive force between the portion of the cell stack and the adhesive resin is reduced.

[0030] As a result, even if the battery cell expands due to a swelling phenomenon caused by gas inside the battery cell generated as the usage time of the battery module increases, the possibility of damage to the battery case can be reduced to improve the stability of the battery module.

[0031] In addition, the life of the battery module can be extended by improving stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 1 is a schematic exploded perspective view of a battery module according to Embodiment 1 of the present invention.

[0033] Figure 2 is a schematic side view illustrating a state in which a cell stack, an adhesive resin, and a film are provided inside a battery module according to Embodiment 1 of the present invention.

[0034] Figure 3 is a schematic side view of a battery cell including a cell stack of a battery module according to Embodiment 1 of the present invention.

[0035] Figure 4a is a schematic front view illustrating a state in which a battery cell is deformed by expansion in a battery module according to a comparative example of the present invention.

[0036] Figure 4b 1 is a schematic front view illustrating a state in which a battery cell is expanded and deformed in the battery module according to Embodiment 1 of the present invention.

[0037] Figure 5 is a schematic side view illustrating a state in which a cell stack, an adhesive resin, and a film are provided inside a battery module according to Embodiment 2 of the present invention.

[0038] Figure 6 is a schematic flowchart illustrating a method for manufacturing a battery module according to Embodiment 3 of the present invention.

[0039] Figure 7 is a schematic flowchart illustrating a method for manufacturing a battery module according to Embodiment 4 of the present invention. DETAILED DESCRIPTION

[0040] Hereinafter, 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 perform the present invention. However, the present invention can be implemented in many different forms and is not limited or constrained by the following examples.

[0041] In order to explain the present invention clearly, detailed description of parts irrelevant to the specification or related known technologies that may unnecessarily obscure the gist of the present invention is omitted, and in this specification, reference symbols are added to components in each accompanying drawing. In this case, the same or similar reference numerals are assigned to the same or similar elements throughout the specification.

[0042] In addition, the terms or words used in the specification and claims should not be restrictively interpreted as ordinary meanings or dictionary-based meanings, but should be interpreted as meanings and concepts consistent with the scope of the present invention based on the principle that the inventor can appropriately define the concepts of the terms to best describe and explain his or her invention.

[0043] Figure 1 1 is a schematic exploded perspective view of the battery module 10 according to the first embodiment of the present invention.

[0044] The present invention provides the battery module 10 according to the first embodiment.

[0045] The battery module 10 according to Embodiment 1 of the present invention may include a cell stack 100 , a frame 400 , an adhesive resin 300 , and films 210 a and 210 b .

[0046] The cell stack 100 of the battery module 10 may be provided by stacking a plurality of cells 110. Each cell 110 may mean a secondary battery, and here, the cell 110 may be a pouch-shaped cell. Specifically, the cell stack 100 may be formed by stacking a plurality of cells 110 side by side to be parallel to each other.

[0047] The cell stack 100 may generate electric energy of the battery module 10 .

[0048] The cell stack 100 may be accommodated inside the frame 400 of the battery module 10 .

[0049] The frame 400 according to the first embodiment of the present invention may have a shape with front and rear surfaces opened, and preferably, may have a generally rectangular parallelepiped shape with front and rear surfaces opened. Here, the frame 400 may be provided to surround the top surface, the bottom surface, and both surfaces of the cell stack 100.

[0050] The frame 400 may maintain the shape of the cell stack 100 inside the battery module 10 and protect the cell stack from external influences.

[0051] However, the structure of the frame 400 may not be limited thereto, and the frame 400 may be a U-shaped frame including a bottom surface and two side surfaces connected to both end portions of the bottom surface.

[0052] Reference Figure 1 The battery module 10 according to Embodiment 1 of the present invention may further include end plates disposed on the front and rear surfaces of the cell stack 100 while shielding the opening of the frame 400. Since the end plates are a known configuration, a detailed description thereof will be omitted.

[0053] Figure 2 2 is a schematic side view illustrating a state in which the cell stack 100 , the adhesive resin 300 , and the films 210 a and 210 b are provided inside the battery module 10 according to Embodiment 1 of the present invention.

[0054] The adhesive resin 300 of the battery module 10 may be disposed between the bottom surface of the cell stack 100 and the frame 400. Specifically, the adhesive resin 300 may be disposed on a specific surface of the frame 400 facing the bottom surface of the cell stack 100.

[0055] The adhesive resin 300 may include an adhesive material having adhesiveness. Therefore, the adhesive resin 300 may allow the cell stack 100 and the frame 400 to be adhered to each other, thereby fixing the cell stack 100 .

[0056] In addition, the adhesive resin 300 may be a thermally conductive synthetic adhesive resin containing a thermally conductive material. Therefore, since the battery cell 110 generates heat according to the use of the battery module 10, the adhesive resin 300 may release the heat generated from the battery cell stack 100 to the outside of the battery module 10. The temperature change inside the battery module 10 may be reduced by the adhesive resin 300 to improve the stability of the battery module 10.

[0057] As an example of a configuration for preventing the battery cell 110 from being damaged, the battery module 10 according to Embodiment 1 of the present invention may include films 210 a and 210 b .

[0058] The films 210a and 210b may be disposed between a portion of the bottom surface of the cell stack 100 and the adhesive resin 300 to reduce a force with which the adhesive resin 300 fixes the portion of the cell stack 100. That is, the films 210a and 210b may reduce an adhesive force between the portion of the cell stack 100 and the adhesive resin 300.

[0059] At this point, the battery cells 110 constituting the cell stack 100 disposed inside the battery module 10 may be pouch-shaped cells as described above. As the pouch-shaped cells are used for an extended period of time, gas may be generated in the pouch-shaped cells, thereby causing an expansion phenomenon in which the pouch expands.

[0060] In addition, when a swelling phenomenon occurs inside the battery module 10 , as the volume of the battery cells 110 increases, a force acting in a direction in which the adjacently stacked battery cells 110 are pushed against each other may be generated.

[0061] Therefore, when the force pushing the battery cells 110 toward each other and the force of the adhesive resin 300 fixing the battery cells 110 act in opposite directions, the bag of the battery cell 110 may be damaged. That is, according to the present invention, the films 210a and 210b may be provided on the easily damaged portion of the bottom surface of the battery cell stack 100 to reduce the force of fixing the battery cell 110 by the adhesive resin 300, thereby preventing or reducing the damage of the bag of the battery cell 110.

[0062] In the films 210a and 210b according to Embodiment 1 of the present invention, the force for fixing the films 210a and 210b to the cell stack 100 may be smaller than the force for fixing the cell stack 100 and the adhesive resin 300 to each other. Therefore, the portion of the cell 110 located on the bottom surface of the cell stack 100 provided with the films 210a and 210b is displaced by the force for fixing the cell 110 to the films 210a and 210b by the adhesive resin 300. Since the cell 110 receives the force for fixing it, it can be moved with a very small force.

[0063] The films 210a and 210b may not be bonded to the cell stack 100. That is, the portion of the cell stack 100 where the films 210a and 210b are disposed is subjected to a fixing force.

[0064] In the battery module 10 according to Embodiment 1 of the present invention, the positions of the description films 210 a and 210 b are set in detail as follows.

[0065] Reference Figure 2 , the films 210a and 210b may be disposed on the bottom surface of the cell stack 100 to cover both edges of the cell stack 100 in the longitudinal direction. In addition, the films 210a and 210b may extend in the direction of stacking the cells 110, and both ends of the films 210a and 210b may be bent upward.

[0066] Specifically, the films 210a and 210b may be provided to cover a portion from an end of each of the two side portions of the cell stack 100 to a portion facing the center in the longitudinal direction on the bottom surface of the cell stack 100. In addition, both end portions bent upward may be provided on portions of the side surface of the cell stack 100. Here, due to Figure 2 1 is a side view illustrating the cell stack 100 when viewed from the side. Figure 2 The portions of the films 210 a and 210 b illustrated in FIG. 2 may be ends of the films 210 a and 210 b that are bent upward.

[0067] As described above, when the battery cell 110 expands in the battery module 10, the force pushing the battery cell 110 against each other and the force fixing the battery cell 110 may coexist, and thus, the bag of the battery cell 110 may be damaged. Here, the possibility of damage to both ends of the bag in the longitudinal direction is relatively high, and therefore, when the bag is molded, this may be a cause of deterioration in durability due to a reduction in edge thickness.

[0068] Therefore, since the durability of the two edges of the bag of the battery cell 110 in the longitudinal direction is weak, when the films 210a and 210b are set to cover the two edges in the longitudinal direction on the bottom surface of the battery cell stack 100, the possibility of damage is high, and the fixing force acting between the battery cell stack 100 and the adhesive resin 300 at this portion can be reduced, so that the battery cell 110 can be movable to effectively prevent or reduce damage to the bag.

[0069] In addition, even when a portion of the battery cell 110 moves to both ends due to the expansion phenomenon, both ends of the films 210 a and 210 b bent upward may be continuously disposed on the bottom of the portion to continuously prevent the bag from being damaged.

[0070] Only part of each of the films 210a and 210b may have adhesive force. For example, in the films 210a and 210b, only one end portion of each of the films 210a or 210b that is bent upward may have adhesive force. That is, only part of each of the films 210a and 210b disposed on the portion of the side surface of the cell stack 100 may have adhesive force. In this case, the portion of each of the films 210a and 210b disposed on the side surface of the cell stack 100 may be bonded to the cell stack 100. Therefore, during the manufacture of the battery module 10, the films 210a and 210b may be easily disposed, and in addition, the films 210a and 210b disposed on the bottom surface of the cell stack 100 may not be bonded to the cell stack 100 to efficiently achieve the purpose of the present invention. As another example, only the portion of the films 210a and 210b disposed on the bottom surface of the cell stack 100 may have adhesive force.

[0071] As an example of a configuration for reducing adhesion to a portion of the bottom surface of the cell stack 100 , the films 210 a and 210 b of the battery module 10 according to Embodiment 1 of the present invention include polyethylene terephthalate.

[0072] The films 210 a and 210 b including polyethylene terephthalate may facilitate movement of the battery cell 110 and may improve insulation properties of corresponding portions.

[0073] The films 210a and 210b of the battery module 10 according to Embodiment 1 of the present invention may be thermally conductive films. That is, each of the films 210a and 210b may include a material having high thermal conductivity.

[0074] In this regard, in the battery module 10 according to Embodiment 1 of the present invention, a portion of the bottom surface of the cell stack 100 that is not in direct contact with the adhesive resin 300 by the arrangement of the films 210a and 210b can weaken the effect of the adhesive resin 300 on heat dissipation of the cell stack 100. Therefore, in order to minimize the reduction in the heat dissipation effect of the cell stack 100, the films 210a and 210b including a material having high thermal conductivity can release part of the heat generated in the cell stack 100.

[0075] Figure 3 1 is a schematic side view of a battery cell 110 including a battery cell stack 100 of a battery module 10 according to Embodiment 1 of the present invention.

[0076] As described above, the battery cells 110 provided in the battery cell stack 100 of the battery module 10 according to Embodiment 1 of the present invention may be pouch-shaped battery cells. Figure 3, the bag of the battery cell 110 may include a cup-shaped portion C provided with an electrode assembly and a sealing portion provided outside the cup-shaped portion C to be sealed. The width of each of the films 210a and 210b according to embodiment 1 of the present invention may be greater than the width of the sealing portion of the bag. Specifically, the width of each of the films 210a and 210b may be 4 mm or more and 6 mm or less than the width of the sealing portion. Here, the width of the sealing portion may be the same as the distance from one end of the cup-shaped portion C to the electrode lead L of the battery cell 110.

[0077] When the sealing portion is sealed during the process of manufacturing the battery cell 110, the outermost portion of the sealing portion can be deformed while the sealant layer of the bag is pushed to the outside of the sealing portion. When the portion is referred to as a deformable portion 111, each of the films 210a and 210b according to embodiment 1 of the present invention may have a width greater than the width t of the deformable portion 111. Specifically, the width of each of the films 210a and 210b may be 4 mm or more and 6 mm or less than the width t of the deformable portion 111. More specifically, the width of each of the films 210a and 210b may be 5 mm greater than the width t of the deformable portion 111. These values ​​can be derived experimentally and may be values ​​that can efficiently demonstrate the effects of the present invention.

[0078] Figure 3 a is a schematic front view illustrating a state in which a cell is expanded and deformed in a battery module according to a comparative example of the present invention, and Figure 3 b is a schematic front view illustrating a state in which a battery cell is deformed by expansion in the battery module according to Embodiment 1 of the present invention.

[0079] Since the battery module according to the comparative example of the present invention does not include the films 210 a and 210 b , the films 210 a and 210 b may not exist between a portion of the bottom surface of the cell stack 100 and the adhesive resin 300 .

[0080] Reference Figure 3 a, when the films 210a and 210b are not provided on the bottom surface of the cell stack 100, the entire bottom surface of the cell 110 may be fixed by the adhesive resin 300. Therefore, both relatively weak edges of the cell 110 in the longitudinal direction may also be fixed by the adhesive resin 300.

[0081] Here, due to the expansion of the battery cells 110, the battery cells 110 may be simultaneously subjected to a force acting in a direction in which the battery cells 110 are pushed against each other and a force with which the adhesive resin 300 fixes the battery cells 110. Therefore, the battery cells 110 may be stretched by the forces acting in opposite directions, and portions of the bag provided at relatively weak two edges of the battery cells 110 in the longitudinal direction are more likely to be damaged.

[0082] On the other hand, the battery module 10 according to Embodiment 1 of the present invention includes the films 210 a and 210 b to reduce the possibility of pouch damage.

[0083] Reference Figure 3 b, the portion of the bottom surface of the cell stack 100 where the film 210a is provided is not fixed by the adhesive resin 300. Here, there may also be an adhesive force between the cell stack 100 and the film 210a, but it may be smaller than the adhesive force between the cell stack 100 and the adhesive resin 300, and when the cell 110 expands, the cell 110 may have a weak adhesion that allows the cell 110 to move relative to the film 210a. Here, the portion of the bottom surface of the cell stack 100 may mean the two edges of the bottom surface of the cell stack 100 in the longitudinal direction.

[0084] In the battery module 10 according to embodiment 1 of the present invention, since the portion of the bottom surface of the cell stack 100 on which the membrane 210a is provided can move relative to the membrane 210a, the expansion of the battery cell 110 can only cause the existence of force in the direction in which the battery cells 110 are pushed against each other, and the force fixing the battery cell 110 can be relatively negligible.

[0085] Therefore, if Figure 3 b, a portion of the bag disposed on each of two relatively weak edges of the battery cell 110 in the longitudinal direction may move relative to the film 210a and may be subjected to minimal tension to reduce the possibility of damage such as tearing of the bag.

[0086] 4 is a schematic side view illustrating a state in which the cell stack 100 , the adhesive resin 300 , and the films 220 a and 220 b are disposed inside the battery module according to Embodiment 2 of the present invention.

[0087] The present invention provides a battery module having different membrane positions as in Embodiment 2.

[0088] Hereinafter, a detailed description of the same configuration as that of the battery module 10 according to Embodiment 1 of the present invention will be omitted.

[0089] The battery module according to Embodiment 2 of the present invention may be the same as the battery module 10 according to Embodiment 1 except for the positions where the films 220 a and 220 b are provided.

[0090] 4 , films 220 a and 220 b of the battery module according to Embodiment 2 of the present invention may be spaced apart from ends in a longitudinal direction on a bottom surface of a cell stack 100 by predetermined lengths, respectively.

[0091] When the films 220a and 220b are provided at positions corresponding to relatively weak portions of the bag of the battery cell 110, since the force for fixing these portions is reduced, the effect of reducing the possibility of damage such as tearing of the bag can occur as in Embodiment 1. That is, even if the films 220a and 220b are not provided to be bonded to both end portions of the cell stack 100 in the longitudinal direction on the bottom surface of the cell stack 100, there can be a case where the effect of the present invention is exhibited.

[0092] In the battery modules according to embodiments 1 and 2 of the present invention, even if the battery cell 110 expands due to an expansion phenomenon caused by gas inside the battery cell 110 generated as the use time of the battery module increases, the possibility of damaging the shell of the bag 110 can be reduced to improve stability, thereby extending the life of the battery module.

[0093] Figure 5 is a schematic flowchart illustrating a method for manufacturing a battery module according to Embodiment 3 of the present invention.

[0094] The present invention provides a method for manufacturing a battery module according to Embodiment 3.

[0095] Hereinafter, a detailed description of the same configuration as that of the battery module 10 according to Embodiment 1 of the present invention will be omitted.

[0096] The method for manufacturing a battery module according to Embodiment 3 of the present invention may include a film placement process ( S10 ), an insertion process ( S30 ), and a resin placement process ( S21 ).

[0097] In the film placement process ( S10 ), a film may be disposed on a portion of the bottom surface of the cell stack 100 .

[0098] Specifically, in the film placement process ( S10 ), the film may be disposed to cover each of two edges in the longitudinal direction on the bottom surface of the cell stack 100 , thereby reducing the possibility of damage to relatively weak two edges of the pouch in the longitudinal direction.

[0099] In the film placement process (S10), an adhesive material, a double-sided tape, etc. may be used on a portion of the film to fix the film, and the film may be attached to the bottom surface of the cell stack 100. Here, since the adhesive force of the adhesive material is weak enough to temporarily fix the film to the cell stack 100, the expansion phenomenon of the cell 110 may start, and the movement of the portion of the cell 110 where the film is provided may not be affected.

[0100] In the inserting process ( S30 ), the cell stack 100 may be inserted into the frame 400 , and in the resin placing process ( S21 ), the adhesive resin ( 300 ) may be placed.

[0101] Here, in the resin placement process, the arrangement manner of the adhesive resin 300 may vary according to the shape of the frame 400 , and the order of the processes may be different.

[0102] In the method for manufacturing a battery module according to Embodiment 3 of the present invention, a case where the frame 400 has a substantially rectangular parallelepiped shape with front and rear surfaces opened will be described.

[0103] Reference Figure 5 When the frame 400 has a generally rectangular parallelepiped shape with the front and rear surfaces opened, the cell stack 100 to which the film is attached in the insertion process (S30) through the front or rear surface of the opening of the frame 400 may be disposed inside the frame 400, and then, the resin placement process (S21) may be performed. In addition, in the resin placement process (S21), the adhesive resin 300 may be disposed by injecting the adhesive resin 300 through a hole formed in the bottom surface of the frame 400.

[0104] Although not shown in Embodiment 3 of the present invention, the method for manufacturing the battery module may additionally include a process of assembling end plates and the like.

[0105] Figure 6 is a schematic flowchart illustrating a method for manufacturing a battery module according to Embodiment 4 of the present invention.

[0106] The present invention provides another method for manufacturing a battery module as in Embodiment 4.

[0107] Hereinafter, a detailed description of the same processes as those of the method for manufacturing a battery module according to Embodiment 3 of the present invention will be omitted.

[0108] The method for manufacturing a battery module according to Embodiment 4 of the present invention may include a film placement process ( S10 ), a resin placement process ( S22 ), and an insertion process ( S30 ).

[0109] Reference Figure 6 In the method for manufacturing a battery module according to Embodiment 4 of the present invention, the type of the resin placement process (S22) and the order of the insertion process (S30) may be different from those in the method for manufacturing a battery module according to Embodiment 3.

[0110] In the method for manufacturing a battery module according to Embodiment 4 of the present invention, a case where a frame has a U-shape will be described.

[0111] In the method for manufacturing a battery module according to embodiment 4 of the present invention, since the frame of the battery module has a U-shape when viewed from the front except for the bottom and both sides, a resin placement process (S22) can be performed and then an insertion process (S30) can be performed.

[0112] Specifically, in the resin placement process (S22), the adhesive resin 300 may be provided by applying the adhesive resin 300 to the bottom surface of the frame 400. Since the top surface of the frame is open, the adhesive resin 300 may be easily provided in this manner.

[0113] Therefore, in the resin placement process ( S22 ) according to Embodiment 4 of the present invention, the adhesive resin 300 may be uniformly disposed on the bottom surface of the frame 400 .

[0114] After applying the adhesive resin 300 , an insertion process ( S30 ) may be performed, and in the insertion process ( S30 ), the film-attached cell stack 100 may be disposed on the top surface of the adhesive resin 300 through the open top surface of the frame 400 .

[0115] Although not shown in Embodiment 4 of the present invention, the method for manufacturing the battery module may additionally include a process of assembling end plates and the like.

[0116] According to the method for manufacturing a battery module according to embodiments 3 and 4 of the present invention, even if the battery cell 110 expands due to an expansion phenomenon caused by gas inside the battery cell 110 generated as the use time of the battery module increases, the possibility of damaging the shell of the battery cell 110 can be reduced to manufacture a battery module with improved stability.

[0117] While embodiments of the present invention have been described with reference to certain embodiments, it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

[0118] [Description of the symbol]

[0119] 10: Battery module

[0120] 100: Battery cell stack

[0121] 110: Battery Cell

[0122] 111: Deformable part

[0123] 210a, 210b, 220a, 220b: membrane

[0124] 300: Adhesive resin

[0125] 400: Framework

[0126] S10: Membrane placement process

[0127] S21, S22: Resin placement treatment

[0128] S30: Insertion processing

Claims

1. A battery module, comprising: A battery cell stack, wherein the battery cell stack has a shape of stacking a plurality of battery cells; a frame in which the battery cell stack is accommodated; an adhesive resin disposed between a bottom surface of the cell stack and the frame so that the cell stack is bonded to the frame; as well as A film is provided between a portion of the bottom surface of the cell stack and the adhesive resin so that an adhesive force between the portion of the cell stack and the adhesive resin is reduced.

2. The battery module according to claim 1, wherein: The film covers both edges of the bottom surface of the cell stack in the longitudinal direction.

3. The battery module according to claim 1, wherein: The film extends in a direction in which the plurality of battery cells are stacked.

4. The battery module according to claim 3, wherein: The battery cell includes a bag, a sealing portion is provided on the bag, and The film has a width in a direction perpendicular to a direction in which the plurality of battery cells are stacked that is larger than a width of the sealing portion by 4 mm or more and 6 mm or less.

5. The battery module according to claim 4, wherein: The sealing portion includes a deformable portion protruding toward the adhesive resin, and The film has a width in a direction perpendicular to a direction in which the plurality of battery cells are stacked that is larger than a width of the deformable portion by 4 mm or more and 6 mm or less.

6. The battery module according to claim 1, wherein: The film is bent so that both end portions of the film are disposed on side surfaces of the cell stack.

7. The battery module according to claim 6, wherein: The film has adhesive force only at both end portions disposed on the side surfaces of the cell stack.

8. The battery module according to claim 1, wherein: The film includes polyethylene terephthalate.

9. The battery module according to claim 1, wherein: The film is a thermally conductive film.

10. A method for manufacturing a battery module, the method comprising: a film placement process of providing a film on a portion of a bottom surface of the cell stack; a resin placement process of providing an adhesive resin between a bottom surface of the battery cell stack and a frame; as well as Insertion process of inserting the cell stack into the frame.

11. The method according to claim 10, wherein: In the film placement process, the film is disposed to cover both edges of the bottom surface of the cell stack in the longitudinal direction.

12. The method according to claim 10, wherein: In the resin placement process, the adhesive resin is applied on the bottom surface of the frame so that the adhesive resin is disposed between the bottom surface of the cell stack and the frame.

13. The method according to claim 10, wherein: In the resin placement process, the adhesive resin is injected through a hole formed in a bottom surface of the frame so that the adhesive resin is disposed between the bottom surface of the cell stack and the frame.

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