Battery module and method for manufacturing the same

Abstract

The present invention relates to a battery module capable of extending its lifespan and a method for manufacturing the same. The battery module according to the present invention reduces the possibility of damage to the cell case and improves stability even when the cell swells due to the swelling phenomenon caused by the gas inside the cell that occurs as the usage time increases. The battery module according to the present invention may include a cell stack in which a plurality of cells are stacked, a frame that houses the cell stack inside, an adhesive resin disposed between the bottom surface of the cell stack and the frame so as to bond the cell stack to the frame, and a film disposed between a part of the bottom surface of the cell stack and the adhesive resin so as to reduce the adhesive force between a part of the cell stack and the adhesive resin.

Description

Technical Field

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[0001] [Cross - reference to Related Applications] This application claims the benefit of priority based on 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, and all the contents disclosed in the documents of the Korean patent applications are included as part of this specification.

[0002] The present invention relates to a battery module and a method for manufacturing the same, and more particularly, to a battery module including a plurality of secondary batteries and a method for manufacturing the same.

Background Art

[0003] In recent years, due to the depletion of fossil fuels, the rising prices of energy sources, and the amplified concern about environmental pollution, the demand for eco - friendly alternative energy sources has become an essential factor for future life. Therefore, research on various power production technologies such as solar power, wind power, and tidal power has been continuously conducted, and power storage devices such as batteries for more efficiently using the electrical energy thus produced have also attracted great attention.

[0004] Furthermore, as the technology development and demand for electronic mobile devices and electric vehicles using batteries increase, the demand for batteries as an energy source has been rapidly increasing, and many studies on batteries to meet various demands have been conducted.

[0005] Batteries for storing electrical energy can generally be classified into primary batteries and secondary batteries. Primary batteries are disposable consumable batteries, while secondary batteries are rechargeable batteries manufactured using materials in which the oxidation and reduction processes between current and substances can be repeated. That is, when a reduction reaction is performed on the material by current, the power source is charged, and when an oxidation reaction is performed on the material, the power source is discharged, and electricity is generated while such charging - discharging is repeated.

[0006] On the other hand, as the need for large-capacity structures has increased in recent years, along with the utilization of batteries as an energy storage source, the demand for battery packs, which are collections of numerous secondary batteries or battery modules, has increased, and consequently, the demand for battery modules has also increased.

[0007] As battery modules are used for an extended period, gas can build up inside the individual secondary batteries that make up the module, potentially causing a phenomenon called "swelling," where the secondary batteries swell.

[0008] Conventional battery modules suffered from a problem where specific parts of the secondary battery would rupture or become damaged due to the swelling phenomenon.

[0009] To solve these problems, there is a need for a battery module in which the internal secondary battery is not damaged even if swelling occurs. [Overview of the project] Problems solved by the invention

[0010] The present invention was devised to solve the aforementioned problems, and the object of the present invention is to provide a battery module and a method for manufacturing the same that can reduce the possibility of cell damage and improve stability even if the internal cells swell as the usage time of the battery module increases. [Means for solving the problem]

[0011] The battery module according to the present invention may include a cell stack in which a plurality of cells are stacked, a frame in which the cell stack is housed, an adhesive resin disposed between the bottom surface of the cell stack and the frame so as to adhere the cell stack to the frame, and a film disposed between a part of the bottom surface of the cell stack and the adhesive resin so as to reduce the adhesive strength between a part of the cell stack and the adhesive resin.

[0012] The film may cover both ends of the cell laminate in the longitudinal direction at the bottom surface of the cell laminate.

[0013] The film may be extended in the direction in which multiple cells are stacked.

[0014] Each cell includes a pouch with a sealing portion formed therein, and the film may have a width in the direction perpendicular to the direction in which the multiple cells are stacked that is 4 mm to 6 mm wider than the width of the sealing portion.

[0015] The sealing portion includes a deformed portion that protrudes toward the adhesive resin, and the film may have a width in the direction perpendicular to the direction in which the multiple cells are stacked that is 4 mm to 6 mm wider than the width of the deformed portion.

[0016] The film may be folded so that both ends are positioned on the sides of the cell laminate.

[0017] The film may only have adhesive force at both ends that are positioned on the sides of the cell laminate.

[0018] The film may contain polyethylene terephthalate.

[0019] The film may be a thermally conductive film.

[0020] The method for manufacturing a battery module according to the present invention may include a film placement step in which a film is placed on a part of the bottom surface of the cell stack, a resin placement step in which an adhesive resin is placed between the bottom surface of the cell stack and the frame, and an insertion step in which the cell stack is inserted into the inside of the frame.

[0021] In the film arrangement stage, the film may be positioned so that it covers both longitudinal edges on the bottom surface of the cell laminate.

[0022] In the resin placement stage, adhesive resin may be applied to the bottom surface of the frame, so that the adhesive resin is placed between the bottom surface of the cell laminate and the frame.

[0023] In the resin placement stage, an adhesive resin may be injected through holes formed in the bottom surface of the frame, and the adhesive resin may be placed between the bottom surface of the cell laminate and the frame.

Advantages of the Invention

[0024] The battery module according to the present invention may include a cell laminate in which a plurality of cells are laminated, a frame inside which the cell laminate is accommodated, an adhesive resin disposed between the bottom surface of the cell laminate and the frame so as to adhere the cell laminate to the frame, and a film disposed between a part of the bottom surface of the cell laminate and the adhesive resin so as to reduce the adhesive force between a part of the cell laminate and the adhesive resin.

[0025] Thereby, due to the swelling phenomenon caused by the gas inside the cell that occurs as the usage time of the battery module increases, even if the cell swells, the possibility of damage to the cell case can be reduced, and the stability of the battery module can be improved.

[0026] In addition, due to the improvement in stability, the life of the battery module can be extended.

Brief Description of the Drawings

[0027] [Figure 1] It is an exploded perspective view schematically showing a battery module according to Example 1 of the present invention. [Figure 2] It is a side view schematically showing a state in which a cell laminate, an adhesive resin, and a film are disposed inside a battery module according to Example 1 of the present invention. [Figure 3] It is a side view schematically showing a cell included in a cell laminate of a battery module according to Example 1 of the present invention. [Figure 4a] It is a front view schematically showing a state in which a cell is deformed due to swelling in a battery module according to a comparative example of the present invention. [Figure 4b] It is a front view schematically showing a state in which a cell is deformed due to swelling in a battery module according to Example 1 of the present invention. [Figure 5]This is a schematic side view showing how a cell laminate, adhesive resin, and film are arranged inside a battery module according to Embodiment 2 of the present invention. [Figure 6] This is a schematic sequence diagram showing the manufacturing method of a battery module according to Example 3 of the present invention. [Figure 7] This is a schematic sequence diagram showing the manufacturing method of a battery module according to Embodiment 4 of the present invention. [Modes for carrying out the invention]

[0028] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings, so that they can be easily implemented by a person with ordinary skill in the art to which the present invention pertains. However, the present invention may be embodied in a variety of different forms and is not limited to or restricted by the following embodiments.

[0029] In order to clearly explain the present invention, detailed descriptions of prior art that are irrelevant to the description or that may obscure the essence of the invention have been omitted. In this specification, when assigning reference numerals to components of each drawing, the same or similar reference numerals are used throughout the specification for components that are the same or similar.

[0030] Furthermore, the terms and words used in this specification and the claims shall not be interpreted in a manner limited to their ordinary and lexicographical meanings, but rather in a manner consistent with the technical idea of ​​the present invention, in accordance with the principle that inventors themselves may define the concepts of terms as appropriate in order to best describe their invention.

[0031] Figure 1 is an exploded perspective view schematically showing a battery module 10 according to Embodiment 1 of the present invention.

[0032] The present invention provides a battery module 10 as Example 1.

[0033] The battery module 10 according to Embodiment 1 of the present invention may include a cell laminate 100, a frame 400, an adhesive resin 300, and films 210a and 210b.

[0034] The cell stack 100 of the battery module 10 may be formed by stacking multiple cells 110. Each cell 110 may represent a single secondary battery, and here, each cell 110 may be a pouch cell. Specifically, the cell stack 100 may be formed by stacking multiple cells 110 parallel to each other.

[0035] The cell stack 100 may generate electrical energy for the battery module 10.

[0036] A cell stack 100 may be housed inside the frame 400 of the battery module 10.

[0037] The frame 400 according to Embodiment 1 of the present invention may have an open front and rear shape, preferably a substantially rectangular parallelepiped shape with an open front and rear. In this case, the frame 400 may be arranged to surround the top, bottom, and both sides of the cell laminate 100.

[0038] The frame 400 allows the cell stack 100 to maintain its shape inside the battery module 10 and to be protected from the outside.

[0039] However, the structure of the frame 400 is not limited to this, and the frame 400 may be a U-shaped frame including a bottom surface and two sides connected to both ends of the bottom surface.

[0040] Referring to Figure 1, the battery module 10 according to Embodiment 1 of the present invention may further include end plates that close the openings in the frame 400 and are positioned on the front and rear surfaces of the cell stack 100. Since the end plates are of a known configuration, a detailed explanation thereof will be omitted.

[0041] Figure 2 is a schematic side view showing how the cell laminate 100, adhesive resin 300, and films 210a and 210b are arranged inside the battery module 10 according to Embodiment 1 of the present invention.

[0042] The adhesive resin 300 of the battery module 10 may be placed between the bottom surface of the cell laminate 100 and the frame 400. Specifically, the adhesive resin 300 may be placed on a specific surface of the frame 400 that faces the bottom surface of the cell laminate 100.

[0043] The adhesive resin 300 may contain an adhesive substance that has adhesive properties. Therefore, the adhesive resin 300 may bond the cell laminate 100 and the frame 400 to fix the cell laminate 100 in place.

[0044] Furthermore, the adhesive resin 300 may be a thermally conductive synthetic adhesive resin containing a thermally conductive substance. Therefore, the adhesive resin 300 can release the heat generated from the cell laminate 100 when the cell 110 generates heat due to the use of the battery module 10 to the outside of the battery module 10. Through the adhesive resin 300, the battery module 10 can experience reduced changes in internal temperature and improved stability.

[0045] As an example of a configuration to prevent damage to cell 110, the battery module 10 according to Embodiment 1 of the present invention may include films 210a and 210b.

[0046] The films 210a and 210b are placed between a portion of the bottom surface of the cell laminate 100 and the adhesive resin 300, thereby reducing the force with which the portion of the cell laminate 100 is fixed by the adhesive resin 300. In other words, the films 210a and 210b can reduce the adhesive force between a portion of the cell laminate 100 and the adhesive resin 300.

[0047] In connection with this, the cells 110 that make up the cell stack 100 arranged inside the battery module 10 may be pouch cells as described above, and pouch cells may experience a swelling phenomenon in which gas is generated from the inside and the pouch swells as the usage time increases.

[0048] Furthermore, if a swelling phenomenon occurs from within the battery module 10, as the volume of the cells 110 increases, a force may be generated that pushes adjacent stacked cells 110 toward each other.

[0049] Therefore, if the forces pushing the cells 110 against each other and the force fixing the cells 110 by the adhesive resin 300 act in opposite directions, a problem may occur in which the pouch of the cells 110 is damaged. In other words, the present invention can prevent or reduce damage to the pouch of the cells 110 by placing films 210a and 210b on a portion of the bottom surface of the cell laminate 100, which is easily damaged, thereby reducing the force with which the adhesive resin 300 fixes the cells 110.

[0050] In Embodiment 1 of the present invention, the force with which the films 210a and 210b are fixed to the cell laminate 100 may be smaller than the force with which the cell laminate 100 and the adhesive resin 300 are fixed to each other. Therefore, some of the cells 110 located on the bottom surface of the cell laminate 100 on which the films 210a and 210b are placed receive the force with which the films 210a and 210b are fixed to the cells 110, instead of the force with which the adhesive resin 300 is fixed to the cells 110, and thus can move even with a small force.

[0051] On the other hand, films 210a and 210b may not have adhesive properties to the cell laminate 100. In other words, a portion of the cell laminate 100 on which films 210a and 210b are placed may not be subjected to any fixing force.

[0052] In the battery module 10 according to Embodiment 1 of the present invention, the positions in which the films 210a and 210b are arranged are described in detail as follows.

[0053] Referring to Figure 2, the films 210a and 210b may be positioned on the bottom surface of the cell laminate 100 so as to cover both ends of the cell laminate 100 in the longitudinal direction. Alternatively, the films 210a and 210b may be formed by extending in the direction in which the cells 110 are laminated and folding both ends upward.

[0054] Specifically, the films 210a and 210b may be arranged to cover the bottom surface of the cell laminate 100 from each end in the longitudinal direction toward the center. The ends that are folded upwards may be placed on a part of the side surface of the cell laminate 100. Here, since Figure 2 is a side view showing the cell laminate 100 as seen from the side, the part of the films 210a and 210b shown in Figure 2 may be one end of the films 210a and 210b that are folded upwards.

[0055] As mentioned above, if a swelling phenomenon occurs inside the battery module 10, the force pushing the cells 110 against each other and the force fixing the cells 110 in place may coexist, potentially damaging the cell 110 pouch. In this case, the ends on both sides in the longitudinal direction of the pouch are relatively more likely to be damaged, which may be due to a decrease in durability caused by a reduction in the thickness of the ends during pouch molding.

[0056] Therefore, since the longitudinal ends of the pouch of cell 110 are weak and prone to damage, if films 210a and 210b are positioned on the bottom surface of the cell laminate 100 to cover both longitudinal ends, the fixing force acting between the cell laminate 100 and the adhesive resin 300 in this area is reduced, allowing the cell 110 to move, thereby effectively preventing or reducing damage to the pouch.

[0057] Furthermore, the ends of the films 210a and 210b, which are folded upwards, are positioned so that even if a part of the cell 110 moves to the ends due to the swelling phenomenon, the films 210a and 210b remain positioned on the bottom surface of that part, thereby continuously preventing damage to the pouch.

[0058] On the other hand, films 210a and 210b may have adhesive properties only in part. For example, only one end of films 210a and 210b that is folded upwards may have adhesive properties. That is, only a portion of films 210a and 210b that are placed on a part of the side surface of the cell laminate 100 may have adhesive properties. In this case, a portion of films 210a and 210b placed on the side surface of the cell laminate 100 may be adhered to the cell laminate 100. Therefore, during the manufacturing process of the battery module 10, the placement of films 210a and 210b is easy, and at the same time, the films 210a and 210b placed on the bottom surface of the cell laminate 100 have no adhesive properties to the cell laminate 100, thus efficiently achieving the objective of the present invention. As another example, only a portion of films 210a and 210b placed on the bottom surface of the cell laminate 100 may have adhesive properties.

[0059] As an example of a configuration for reducing the adhesive force to a portion of the bottom surface of the cell laminate 100, the films 210a and 210b of the battery module 10 according to Example 1 of the present invention may contain polyethylene terephthalate.

[0060] The films 210a and 210b, made of polyethylene terephthalate, facilitate the movement of the cell 110 and can also improve the insulation performance of that portion.

[0061] 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, the films 210a and 210b may contain a material with high thermal conductivity.

[0062] In connection with this, the battery module 10 according to Embodiment 1 of the present invention can reduce the effect of heat dissipation from the cell laminate 100 by the adhesive resin 300 on a portion of the bottom surface of the cell laminate 100 that does not directly contact the adhesive resin 300 due to the arrangement of films 210a and 210b. Therefore, in order to minimize the reduction in the effect of heat dissipation from the cell laminate 100, films 210a and 210b containing a material with high thermal conductivity can partially dissipate the heat generated from the cell laminate 100.

[0063] Figure 3 is a schematic side view showing the cells 110 included in the cell stack 100 of the battery module 10 according to Embodiment 1 of the present invention.

[0064] As described above, the cell 110 included in the cell stack 100 of the battery module 10 according to Embodiment 1 of the present invention may be a pouch cell. Referring to Figure 3, the pouch of the cell 110 may include a cup portion (C) in which an electrode assembly is placed, and a sealing portion placed outside the cup portion (C) and sealed. The films 210a and 210b according to Embodiment 1 of the present invention may have a width greater than the width of the sealing portion of the pouch. Specifically, the films 210a and 210b may have a width that is 4 mm or more and 6 mm or less greater 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 portion (C) to the electrode lead (L) of the cell 110.

[0065] On the other hand, during the manufacturing process of cell 110, when sealing the sealing portion, the sealant layer of the pouch may be pushed outward from the sealing portion, potentially causing deformation of the outermost part of the sealing portion. This portion is referred to as the deformed portion 111, and the films 210a and 210b according to Example 1 of the present invention may have a width greater than the width (t) of the deformed portion 111. Specifically, the films 210a and 210b may have a width that is 4 mm to 6 mm greater than the width (t) of the deformed portion 111. More specifically, the films 210a and 210b may have a width that is 5 mm greater than the width (t) of the deformed portion 111. Such values ​​were derived through experimentation and may be values ​​that can efficiently demonstrate the effects of the present invention.

[0066] Figure 3a is a schematic front view showing how the cell 110 is deformed by swelling in a comparative example of the present invention, and Figure 3b is a schematic front view showing how the cell 110 is deformed by swelling in a battery module 10 according to Example 1 of the present invention.

[0067] In the comparative example of the present invention, the battery module does not include films 210a and 210b, so there are no films 210a and 210b between a portion of the bottom surface of the cell laminate 100 and the adhesive resin 300.

[0068] Referring to Figure 3a, if films 210a and 210b are not placed on the bottom surface of the cell laminate 100, the cells 110 may be fixed on all bottom surfaces with adhesive resin 300. Therefore, the relatively fragile longitudinal ends on both sides of the cell 110 may also be fixed with adhesive resin 300.

[0069] In this case, the swelling of the cells 110 allows them to simultaneously experience forces acting in a direction that pushes them against each other, as well as forces fixing them in place by the adhesive resin 300. Therefore, tension may be generated in the cells 110 due to forces acting in opposite directions, and parts of the pouch located at the relatively fragile ends of the cells 110 in the longitudinal direction may be more likely to be damaged.

[0070] On the other hand, the battery module 10 according to Example 1 of the present invention includes films 210a and 210b, which reduces the possibility of damage to the pouch.

[0071] Referring to Figure 3b, a portion of the bottom surface of the cell laminate 100 on which the film 210a is placed is no longer fixed by the adhesive resin 300. In this case, there may be some adhesive force between the cell laminate 100 and the film 210a, but it may be smaller than the adhesive force between the cell laminate 100 and the adhesive resin 300, and the adhesive force may be weak enough that the cell 110 can move relative to the film 210a when swelling of the cell 110 occurs. Here, a portion of the bottom surface of the cell laminate 100 may mean both ends in the longitudinal direction of the bottom surface of the cell laminate 100.

[0072] In the battery module 10 according to Embodiment 1 of the present invention, a portion of the bottom surface of the cell laminate 100 on which the film 210a is arranged is movable relative to the film 210a. Therefore, due to the swelling of the cells 110, only a force exists in the direction that pushes the cells 110 toward each other, and the force fixing the cells 110 may be at a relatively negligible level.

[0073] Therefore, as shown in Figure 3b, the portions of the pouch located at both longitudinal ends of the relatively fragile cell 110 are movable relative to the film 210a and are not subjected to much tensile force, thus reducing the possibility of damage such as tearing of the pouch.

[0074] Figure 4 is a schematic side view showing how the cell laminate 100, adhesive resin 300, and films 220a and 220b are arranged inside the battery module according to Embodiment 2 of the present invention.

[0075] The present invention provides a battery module with a different film position as Example 2.

[0076] A detailed explanation of a configuration similar to that of the battery module 10 according to Embodiment 1 of the present invention will be omitted below.

[0077] The battery module according to Embodiment 2 of the present invention may be identical to the battery module 10 according to Embodiment 1, except for the positions where the films 220a and 220b are arranged.

[0078] Referring to Figure 4, the films 220a and 220b of the battery module according to Embodiment 2 of the present invention may be arranged on the bottom surface of the cell laminate 100 at a certain longitudinal distance from each end portion in the longitudinal direction.

[0079] When films 220a and 220b are positioned in the pouch of cell 110 at locations corresponding to relatively vulnerable parts, the force fixing those parts is reduced, and the effect of reducing the possibility of damage such as tearing of the pouch may be the same as in Example 1. In other words, the effects of the present invention may be achieved even if films 220a and 220b are not positioned on both longitudinal ends of the bottom surface of the cell laminate 100.

[0080] The battery modules according to Embodiments 1 and 2 of the present invention can exhibit an effect of improving stability by reducing the possibility of damage to the case of the cell 110 even if the cell 110 swells due to the swelling phenomenon caused by gas inside the cell 110 that occurs as the usage time of the battery module increases, thereby extending the lifespan of the battery module.

[0081] Figure 5 is a schematic sequence diagram showing the manufacturing method of a battery module according to Example 3 of the present invention.

[0082] The present invention provides a method for manufacturing a battery module as Example 3.

[0083] A detailed explanation of a configuration similar to that of the battery module 10 according to Embodiment 1 of the present invention will be omitted below.

[0084] The method for manufacturing a battery module according to Embodiment 3 of the present invention may include a film placement step (S10), an insertion step (S30), and a resin placement step (S21).

[0085] In the film placement stage (S10), a film can be placed on a portion of the bottom surface of the cell laminate 100.

[0086] Specifically, in the film placement stage (S10), the film is positioned to cover both longitudinal edges on the bottom surface of the cell laminate 100, thereby reducing the possibility of damage to the relatively fragile longitudinal edges of the pouch.

[0087] In the film placement stage (S10), adhesive material, double-sided tape, etc. may be used on a portion of the film to fix it in place, so that the film adheres to the bottom surface of the cell laminate 100. In this case, the adhesive strength of the adhesive material, etc., only needs to be weak enough to temporarily fix the film to the cell laminate 100, and may not affect the movement of a portion of the cell 110 where the film is placed, even if the swelling phenomenon of the cell 110 begins.

[0088] In the insertion stage (S30), the cell laminate 100 may be inserted into the frame 400, and in the resin placement stage (S21), the adhesive resin 300 may be placed between the bottom surface of the cell laminate 100 and the frame 400.

[0089] Here, depending on the shape of the frame 400, the arrangement method of the adhesive resin 300 in the resin arrangement stage may vary, and the order of each stage may differ.

[0090] The manufacturing method for a battery module according to Embodiment 3 of the present invention describes the case in which the frame 400 has a substantially rectangular parallelepiped shape with open front and rear surfaces.

[0091] Referring to Figure 5, if the frame 400 has a roughly rectangular parallelepiped shape with open front and rear surfaces, the cell laminate 100 with the film attached may be placed inside the frame 400 via the open front or rear surface of the frame 400 during the insertion stage (S30), after which the resin placement stage (S21) may proceed. Alternatively, during the resin placement stage (S21), the adhesive resin 300 may be placed by injecting it through a hole formed in the bottom surface of the frame 400.

[0092] Although not shown in Example 3 of the present invention, the method for manufacturing a battery module may further include a step in which end plates and the like are assembled.

[0093] Figure 6 is a schematic sequence diagram showing the manufacturing method of a battery module according to Embodiment 4 of the present invention.

[0094] The present invention provides a method for manufacturing a battery module using another method as Example 4.

[0095] Detailed explanations of the same steps as those in the manufacturing method of the battery module according to Embodiment 3 of the present invention will be omitted below.

[0096] The method for manufacturing a battery module according to Embodiment 4 of the present invention may include a film placement step (S10), a resin placement step (S22), and an insertion step (S30).

[0097] Referring to Figure 6, the method for manufacturing a battery module according to Embodiment 4 of the present invention may differ from the method for manufacturing a battery module according to Embodiment 3 in terms of the resin placement step (S22) and the order of the insertion step (S30).

[0098] The manufacturing method for a battery module according to Embodiment 4 of the present invention will describe the case in which the frame has a U-shape.

[0099] In the method for manufacturing a battery module according to Embodiment 4 of the present invention, since the frame of the battery module includes the bottom surface and both sides and has a U-shape when viewed from the front, the insertion step (S30) may proceed after the resin placement step (S22).

[0100] Specifically, in the resin placement stage (S22), the adhesive resin 300 may be placed by applying it to the bottom surface of the frame 400. Since the top surface of the frame is open, this method of placing the adhesive resin 300 is often easy.

[0101] Therefore, in the resin placement step (S22) according to Example 4 of the present invention, the adhesive resin 300 can be uniformly placed on the bottom surface of the frame 400.

[0102] After the adhesive resin 300 is applied, the insertion step (S30) may be carried out, in which the cell laminate 100 with the film attached to it may be placed on the upper surface of the adhesive resin 300 via the open upper surface of the frame 400.

[0103] Although not shown in Example 4 of the present invention, the method for manufacturing a battery module may further include a step in which end plates and the like are assembled.

[0104] According to the battery module manufacturing method of Examples 3 and 4 of the present invention, even if the cell 110 swells due to the swelling phenomenon caused by gas inside the cell 110 that occurs as the usage time of the battery module increases, it is possible to manufacture a battery module in which the possibility of damage to the case of the cell 110 is reduced and stability is improved.

[0105] Although the present invention has been described above, even if limited by embodiments and drawings, the present invention is not limited thereto, and various implementations are possible by persons with ordinary skill in the art to which the present invention pertains, within the equivalent scope of the technical concept of the present invention and the claims described below. [Explanation of Symbols]

[0106] 10 Battery Modules 100-cell stack 110 cells 111 Deformed part 210a, 210b, 220a, 220b film 300 Adhesive resin 400 frames S10 Film placement stage S21, S22 Resin placement stage S30 Insertion stage

Claims

1. A cell stack in which multiple cells are stacked, A frame in which the cell stack is housed, An adhesive resin is placed between the bottom surface of the cell laminate and the frame so as to adhere the cell laminate to the frame, A film is placed between a portion of the bottom surface of the cell laminate and the adhesive resin such that the adhesive force between a portion of the cell laminate and the adhesive resin is reduced, Includes, The bottom surface of the cell laminate is the surface facing the frame and the adhesive resin. The film is extended in the direction in which the plurality of cells are stacked, The cell includes a pouch in which a sealing portion is formed. The battery module wherein the film has a width in a direction perpendicular to the direction in which the plurality of cells are stacked that is 4 mm or more and 6 mm or less than the width of the sealing portion.

2. The battery module according to claim 1, wherein the film covers both ends of the cell laminate in the longitudinal direction at the bottom surface of the cell laminate, and the longitudinal direction of the cell laminate is perpendicular to the direction in which the plurality of cells are stacked.

3. The sealing portion is, It includes a deformed portion that protrudes toward the adhesive resin, The aforementioned film is The battery module according to claim 1, wherein the width in the direction perpendicular to the direction in which the plurality of cells are stacked is 4 mm or more and 6 mm or less than the width of the deformed portion.

4. A cell laminate in which a plurality of cells are stacked, A frame in which the cell stack is housed, An adhesive resin is placed between the bottom surface of the cell laminate and the frame so as to adhere the cell laminate to the frame, A film is placed between a portion of the bottom surface of the cell laminate and the adhesive resin such that the adhesive force between a portion of the cell laminate and the adhesive resin is reduced, Includes, The bottom surface of the cell laminate is the surface facing the frame and the adhesive resin. The aforementioned film is A battery module in which both ends are bent so that they are positioned on the sides of the cell stack.

5. The aforementioned film is The battery module according to claim 4, wherein adhesive force exists only at both ends located on the side surface of the cell stack.

6. The battery module according to claim 1 or 2, wherein the film comprises polyethylene terephthalate.

7. The battery module according to claim 1 or 2, wherein the film is a thermally conductive film.

8. A method for manufacturing a battery module according to Claim 1, A film placement step in which a film is placed on a portion of the bottom surface of the cell laminate, A resin placement step in which an adhesive resin is placed between the bottom surface of the cell laminate and the frame, The insertion step involves inserting the cell stack into the frame, A method for manufacturing a battery module that includes [the specified component].

9. The film arrangement step involves arranging the film so that it covers both longitudinal edges on the bottom surface of the cell laminate. The method for manufacturing a battery module according to claim 8, wherein the longitudinal direction of the cell stack is perpendicular to the direction in which the plurality of cells are stacked.

10. The method for manufacturing a battery module according to claim 8 or 9, wherein the resin placement step involves applying the adhesive resin to the bottom surface of the frame so that the adhesive resin is placed between the bottom surface of the cell laminate and the frame.

11. The method for manufacturing a battery module according to claim 8 or 9, wherein the resin placement step involves injecting the adhesive resin through a hole formed in the bottom surface of the frame, so that the adhesive resin is placed between the bottom surface of the cell laminate and the frame.

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