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

[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 Mar. 9, 2023, and all of the contents disclosed in the documents of the Korean patent applications are incorporated herein by reference in their entirety.

[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 energy source prices 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 carried out, and power storage devices such as batteries for more efficiently using the electrical energy produced in this way 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 increased rapidly, and many studies on batteries to meet various requirements 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 one hand, recently, as the need for large-capacity structures has increased along with their use as energy storage sources, the demand for battery packs that aggregate a large number of secondary batteries or battery modules has been increasing, and accordingly, the demand for battery modules has also been increasing.

[0007] As the usage time increases, there is a possibility that gas is generated inside the unit secondary batteries that make up the battery module, and a swelling phenomenon occurs in which the secondary battery bulges.

[0008] In conventional battery modules, a problem has occurred in that specific parts of the secondary battery are torn or damaged due to the swelling phenomenon.

[0009] In order to solve such problems, there is a need for a battery module in which the internal secondary battery is not damaged even when the swelling phenomenon occurs.

Summary of the Invention

[0010] The present invention has been devised to solve the above problems, and an object of the present invention is to provide a battery module and a method for manufacturing the same that can reduce the possibility of damage to cells and improve stability even when the internal cells bulge as the usage time of the battery module increases.

Means for Solving the Problems

[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 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 that the adhesive force between a part of the cell stack and the adhesive resin is reduced.

[0012] The film may cover both end portions in the longitudinal direction of the cell stack at the bottom surface of the cell stack.

[0013] The film may extend in the direction in which a plurality of cells are stacked.

[0014] The cell includes a pouch in which a sealing portion is formed, and the width of the film in a direction perpendicular to the direction in which the plurality of cells are stacked may be 4 mm or more and 6 mm or less larger than the width of the sealing portion.

[0015] The sealing portion includes a deformed portion protruding toward the adhesive resin, and the width of the film in a direction perpendicular to the direction in which the plurality of cells are stacked may be 4 mm or more and 6 mm or less larger than the width of the deformed portion.

[0016] The film may be bent so that both ends are disposed on the side surface of the cell stack.

[0017] Adhesive force may exist only at both ends disposed on the side surface of the cell stack.

[0018] The film may include 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 frame.

[0021] In the film placement step, the film may be placed so as to cover both longitudinal ends on the bottom surface of the cell stack.

[0022] In the resin placement step, an 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 stack and the frame.

[0023] In the resin placement step, 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 stacked, a frame inside which the cell laminate is housed, 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 lifespan of the battery module can be extended.

Brief Description of the Drawings

[0027]

Figure 1

Figure 2

Figure 3

Figure 4a

Figure 4b

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0028] Hereinafter, with reference to the attached drawings, preferred embodiments of the present invention will be described in detail so that those having ordinary knowledge in the technical field to which the present invention pertains can easily implement it. However, the present invention may be embodied in various different forms and is not limited or restricted by the following embodiments.

[0029] To clearly explain the present invention, a detailed description of parts not related to the explanation or of known technologies that may obscure the gist of the present invention is omitted. When adding reference signs to the components of each drawing in this specification, the same or similar reference signs are given to the same or similar components throughout the specification.

[0030] Also, the terms and words used in this specification and the claims should not be construed as being limited to their ordinary and dictionary meanings. In accordance with the principle that the inventor himself can appropriately define the concept of the terms in order to explain the invention in the best way, they must be construed as meanings and concepts conforming to the technical idea of the present invention.

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

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

[0033] The battery module 10 according to Example 1 of the present invention may include a cell stack 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 a plurality of cells 110. The cell 110 may mean a single secondary battery, and here, the cell 110 may be a pouch cell. Specifically, the cell stack 100 may be formed by stacking a plurality of cells 110 in parallel with each other.

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

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

[0037] The frame 400 according to Example 1 of the present invention may have a shape with an open front and rear surfaces, and preferably, may have a shape of a substantially rectangular parallelepiped with open front and rear surfaces. At this time, the frame 400 may be arranged to surround the upper surface, the bottom surface, and both side surfaces of the cell stack 100.

[0038] With the frame 400, the cell stack 100 may maintain its shape inside the battery module 10 and may be protected from the outside.

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

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

[0041] FIG. 2 is a side view schematically showing a state in which a cell laminate 100, an adhesive resin 300, and films 210a and 210b are arranged inside a battery module 10 according to Embodiment 1 of the present invention.

[0042] The adhesive resin 300 of the battery module 10 may be disposed between the bottom surface of the cell laminate 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 laminate 100.

[0043] The adhesive resin 300 may contain an adhesive substance having an adhesive force. Therefore, the adhesive resin 300 may adhere the cell laminate 100 and the frame 400 to fix the cell laminate 100.

[0044] Further, the adhesive resin 300 may be a thermally conductive synthetic adhesive resin containing a thermally conductive substance. Therefore, when the battery module 10 is used, heat generated from the cell 110 and generated from the cell laminate 100 can be released to the outside of the battery module 10. Through the adhesive resin 300, the change in the internal temperature of the battery module 10 can be reduced, and the stability can be improved.

[0045] As an example of a configuration for preventing damage to the 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 disposed between a part of the bottom surface of the cell laminate 100 and the adhesive resin 300, and can reduce the force by which a part of the cell laminate 100 is fixed by the adhesive resin 300. That is, the films 210a and 210b can reduce the adhesive force between a part of the cell laminate 100 and the adhesive resin 300.

[0047] In connection with this, the cell 110 that constitutes the cell stack 100 disposed inside the battery module 10 may be a pouch cell as described above. The pouch cell may exhibit a swelling phenomenon in which gas is generated inside and the pouch bulges as the usage time increases.

[0048] Further, when a swelling phenomenon occurs inside the battery module 10, as the volume of the cell 110 increases, a force may be generated that acts in the direction of pushing adjacent cells 110 stacked on each other away from each other.

[0049] Therefore, if the force that pushes the cells 110 away from each other and the force that fixes the cells 110 by the adhesive resin 300 act in opposite directions to each other, there may be a problem that the pouch of the cell 110 is damaged. That is, in the present invention, films 210a and 210b are disposed on a part of the bottom surface of the cell stack 100 that is easily damaged, and by reducing the force with which the adhesive resin 300 fixes the cell 110, it is possible to prevent or reduce damage to the pouch of the cell 110.

[0050] In the films 210a and 210b according to Example 1 of the present invention, the force with which they are fixed to the cell stack 100 may be smaller than the force with which the cell stack 100 and the adhesive resin 300 are fixed to each other. Therefore, a part of the cell 110 located on the bottom surface of the cell stack 100 where the films 210a and 210b are disposed receives the force with which the films 210a and 210b fix the cell 110 instead of the force with which the adhesive resin 300 fixes the cell 110, and thus can move even with a small force.

[0051] On the other hand, the films 210a and 210b may have no adhesive force with the cell stack 100. That is, a part of the cell stack 100 where the films 210a and 210b are disposed may be in a state of not receiving a fixing force.

[0052] In the battery module 10 according to Example 1 of the present invention, the positions where the films 210a and 210b are disposed will be specifically described as follows.

[0053] Referring to FIG. 2, the films 210a and 210b may be arranged to cover both end portions of the cell stack 100 in the longitudinal direction at the bottom surface of the cell stack 100. Further, the films 210a and 210b may be extended in the direction in which the cells 110 are stacked, and both ends may be formed by being bent upward.

[0054] Specifically, the films 210a and 210b may be arranged to cover from each end portion on both sides in the longitudinal direction to a part toward the center at the bottom surface of the cell stack 100. Further, both ends bent upward may be arranged at a part of the side surface of the cell stack 100. Here, since FIG. 2 is a side view showing a state of the cell stack 100 viewed from the side, a part of the films 210a and 210b shown in FIG. 2 may be one end of the films 210a and 210b bent upward.

[0055] As described above, when a swelling phenomenon occurs in which the cells 110 swell inside the battery module 10, the force by which the cells 110 push each other and the force by which the cells 110 are fixed may coexist, and there is a possibility that the pouches of the cells 110 are damaged. At this time, there may be a high possibility that both end portions in the longitudinal direction of the pouch are relatively damaged, which may be caused by weakening of durability due to a decrease in the thickness of the end portion during pouch formation.

[0056] Therefore, since the durability of both end portions in the longitudinal direction of the pouch of the cell 110 is weak and there is a high possibility of damage, when the films 210a and 210b are arranged to cover both end portions in the longitudinal direction at the bottom surface of the cell stack 100, the fixing force acting between the cell stack 100 of this portion and the adhesive resin 300 is reduced and the cell 110 becomes movable, so that damage to the pouch can be efficiently prevented or reduced.

[0057] Further, both ends of the films 210a and 210b bent upward can continuously prevent damage to the pouch by arranging the films 210a and 210b to follow the bottom surface of that portion even when a part of the cell 110 moves to both ends due to the swelling phenomenon.

[0058] On the other hand, the films 210a and 210b may have adhesion only in part. As an example, only one end of the films 210a and 210b bent upward by the films 210a and 210b may have adhesion. That is, only a part of the films 210a and 210b disposed on a part of the side surface of the cell stack 100 may have adhesion. In this case, a part of the films 210a and 210b disposed on the side surface of the cell stack 100 may be adhered to the cell stack 100. Therefore, in the manufacturing process of the battery module 10, the films 210a and 210b can be easily arranged, and at the same time, the films 210a and 210b disposed on the bottom surface of the cell stack 100 have no adhesion to the cell stack 100, so the object of the present invention can be efficiently achieved. As another example, only a part of the films 210a and 210b disposed on the bottom surface of the cell stack 100 may have adhesion.

[0059] As an example of a configuration for reducing the adhesion to a part of the bottom surface of the cell stack 100, the films 210a and 210b of the battery module 10 according to Embodiment 1 of the present invention may contain polyethylene terephthalate.

[0060] The films 210a and 210b made of polyethylene terephthalate can also facilitate the movement of the cells 110 and improve the insulation performance of the relevant part.

[0061] The films 210a and 210b of the battery module 10 according to Embodiment 1 of the present invention may be heat-conductive films. That is, the films 210a and 210b may contain a substance with high thermal conductivity.

[0062] In connection with this, in the battery module 10 according to Example 1 of the present invention, a part of the bottom surface of the cell stack 100 that is not in direct contact with the adhesive resin 300 due to the arrangement of the films 210a and 210b can reduce the effect of the heat of the cell stack 100 being released by the adhesive resin 300. Therefore, in order to minimize the reduction in the effect of the heat of the cell stack 100 being released, the films 210a and 210b containing a highly thermally conductive substance can release a part of the heat generated from the cell stack 100.

[0063] FIG. 3 is a side view schematically showing a cell 110 included in the cell stack 100 of the battery module 10 according to Example 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 Example 1 of the present invention may be a pouch cell. Referring to FIG. 3, the pouch of the cell 110 may include a cup portion (C) in which an electrode assembly is disposed and a sealing portion disposed outside the cup portion (C) and sealed. The films 210a and 210b according to Example 1 of the present invention may have a width larger than the width of the sealing portion of the pouch. Specifically, the films 210a and 210b may have a width 4 mm or more and 6 mm or less larger 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, when sealing the sealing portion during the manufacturing process of the cell 110, the sealant layer of the pouch may be pushed outside the sealing portion, and deformation of the outermost side of the sealing portion may occur. This portion is defined as the deformed portion 111, and the films 210a and 210b according to Example 1 of the present invention may have a width larger than the width (t) of the deformed portion 111. Specifically, the films 210a and 210b may have a width 4 mm or more and 6 mm or less larger than the width (t) of the deformed portion 111. More specifically, the films 210a and 210b may have a width 5 mm larger than the width (t) of the deformed portion 111. Such numerical values are derived through experiments and can be numerical values that can efficiently exhibit the effects of the present invention.

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

[0067] Since the battery module according to the comparative example of the present invention does not include the films 210a and 210b, the films 210a and 210b do not exist between a part of the bottom surface of the cell stack 100 and the adhesive resin 300.

[0068] Referring to Figure 3a, when the films 210a and 210b are not disposed on the bottom surface of the cell stack 100, all bottom surfaces of the cell 110 may be fixed by the adhesive resin 300. Therefore, both longitudinal ends of the relatively fragile cell 110 may also be fixed by the adhesive resin 300.

[0069] At this time, due to the swelling of the cell 110, the cell 110 can simultaneously receive a force acting in a direction in which the cells 110 push each other and a force fixed by the adhesive resin 300. Therefore, the cell 110 may be subjected to tension by forces acting in opposite directions, and a part of the pouch located at both longitudinal ends of the relatively fragile cell 110 may be highly likely to be damaged.

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

[0071] Referring to FIG. 3b, a part of the bottom surface of the cell stack 100 where the film 210a is disposed is not fixed by the adhesive resin 300. At this time, there may be an adhesive force between the cell stack 100 and the film 210a, but it is smaller than the adhesive force between the cell stack 100 and the adhesive resin 300. When swelling of the cell 110 occurs, the adhesive force may be weak enough for the cell 110 to be movable relative to the film 210a. Here, a part of the bottom surface of the cell stack 100 may mean both side end portions in the longitudinal direction on the bottom surface of the cell stack 100.

[0072] In the battery module 10 according to Embodiment 1 of the present invention, since a part of the bottom surface of the cell stack 100 where the film 210a is disposed is movable relative to the film 210a, when the cells 110 swell, only a force in the direction in which the cells 110 push each other exists, and the force for fixing the cells 110 may be at a relatively negligible level.

[0073] Therefore, a part of the pouch located at both side ends in the longitudinal direction of the relatively fragile cell 110 as shown in FIG. 3b is movable relative to the film 210a and hardly receives a tensile force, so the possibility of damage such as the pouch being torn can be reduced.

[0074] FIG. 4 is a side view schematically showing a state in which the cell stack 100, the adhesive resin 300, and the films 220a and 220b are disposed inside the battery module according to Embodiment 2 of the present invention.

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

[0076] Hereinafter, a detailed description of the configuration similar to that of the battery module 10 according to Embodiment 1 of the present invention will be omitted.

[0077] 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 220a and 220b are disposed.

[0078] Referring to FIG. 4, the films 220a and 220b of the battery module according to Embodiment 2 of the present invention may be arranged at a certain length away from the respective end portions on both sides in the longitudinal direction at the bottom surface of the cell stack 100.

[0079] When the films 220a and 220b are arranged at positions corresponding to the relatively vulnerable portions in terms of durability in the pouch of the cell 110, the force for fixing that portion decreases. Thus, the effect of reducing the possibility of damage such as the pouch being torn may be the same as in Embodiment 1. That is, even if the films 220a and 220b are not arranged along both end portions in the longitudinal direction at the bottom surface of the cell stack 100, the present invention may exhibit its effects.

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

[0081] FIG. 5 is a flowchart schematically showing a method of manufacturing a battery module according to Embodiment 3 of the present invention.

[0082] The present invention provides a method of manufacturing a battery module as Embodiment 3.

[0083] Hereinafter, a detailed description of the configuration similar to that of the battery module 10 according to Embodiment 1 of the present invention will be omitted.

[0084] The method of manufacturing a battery module according to Embodiment 3 of the present invention may proceed including a film arranging step (S10), an inserting step (S30), and a resin arranging step (S21).

[0085] In the film arranging step (S10), a film can be arranged on a part of the bottom surface of the cell stack 100.

[0086] Specifically, in the film placement step (S10), the film is placed so as to cover both longitudinal ends at the bottom surface of the cell laminate 100, and the possibility of damage to both longitudinal ends of the relatively fragile pouch can be reduced.

[0087] In the film placement step (S10), for fixing the film, an adhesive substance, a double-sided tape, etc. may be used for a part of the film, and the film may be attached to the bottom surface of the cell laminate 100. At this time, the adhesive force of the adhesive substance or the like is sufficient if it is a weak adhesive force that temporarily fixes the film to the cell laminate 100, so that the swelling phenomenon of the cell 110 does not affect the movement of a part of the cell 110 where the film is placed.

[0088] In the insertion step (S30), the cell laminate 100 may be inserted into the inside of the frame 400, and in the resin placement step (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 may be various in the resin placement step, and the order of each step may be different.

[0090] 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 the front and rear surfaces open will be described.

[0091] Referring to FIG. 5, when the frame 400 has a substantially rectangular parallelepiped shape with the front and rear surfaces open, after the cell laminate 100 with the film attached is placed inside the frame 400 through the open front or rear surface of the frame 400 in the insertion step (S30), the resin placement step (S21) may proceed. Also, in the resin placement step (S21), the adhesive resin 300 may be placed by injecting the adhesive resin 300 through the holes 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 an end plate or the like is assembled.

[0093] FIG. 6 is a flowchart schematically showing a method for manufacturing a battery module according to Example 4 of the present invention.

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

[0095] Hereinafter, detailed descriptions of the same steps as those in the method for manufacturing a battery module according to Example 3 of the present invention are omitted.

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

[0097] Referring to FIG. 6, in the method for manufacturing a battery module according to Example 4 of the present invention, the method of the resin placement step (S22) and the order of the insertion step (S30) may be different from those in the method for manufacturing a battery module according to Example 3.

[0098] In the method for manufacturing a battery module according to Example 4 of the present invention, a case where the frame has a U shape is described.

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

[0100] Specifically, in the resin placement step (S22), the adhesive resin 300 may be placed by applying the adhesive resin 300 to the bottom surface of the frame 400. Since the upper surface of the frame is open, it may be easy to place the adhesive resin 300 in such a manner.

[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 application of the adhesive resin 300, the insertion step (S30) may proceed. In the insertion step (S30), the cell laminate 100 with the film attached may be placed on the upper surface of the adhesive resin 300 through 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 an end plate or the like is assembled.

[0104] According to the method for manufacturing a battery module according to Examples 3 and 4 of the present invention, due to the swelling phenomenon caused by the gas inside the cell 110 that occurs as the usage time of the battery module increases, even if the cell 110 swells, the possibility of damage to the case of the cell 110 can be reduced, and a battery module with improved stability can be manufactured.

[0105] As described above, although the present invention has been described with reference to limited examples and drawings, the present invention is not limited thereto, and various implementations are possible within the equivalent scope of the technical idea of the present invention and the following claims by those having ordinary knowledge in the technical field to which the present invention pertains.

Description of Reference Numerals

[0106] 10 Battery module 100 Cell laminate 110 Cell 111 Deformation part 210a, 210b, 220a, 220b Films 300 Adhesive resin 400 Frame S10 Film placement step S21, S22 Resin placement steps S30 Insertion step

Claims

1. A cell stack in which a plurality of cells are stacked, A frame in which the cell stack is housed 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, A film disposed between a part of the bottom surface of the cell stack and the adhesive resin so that the adhesive force between a part of the cell stack and the adhesive resin is reduced, a battery module comprising the same.

2. The film, The battery module according to claim 1, covering both end portions in the longitudinal direction at the bottom surface of the cell stack.

3. The film, The battery module according to claim 1 or 2, extending in the direction in which the plurality of cells are stacked.

4. The cell, Including a pouch in which a sealing portion is formed, The film, The battery module according to claim 3, 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 larger than the width of the sealing portion.

5. The sealing portion, Including a deformed portion protruding toward the adhesive resin, The film, The battery module according to claim 4, 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 larger than the width of the deformed portion.

6. The film, The battery module according to claim 1 or 2, which is bent so that both ends are disposed on the side surface of the cell stack.

7. The film, The battery module according to claim 6, wherein an adhesive force exists only at both ends disposed on the side surface of the cell stack.

8. The film, The battery module according to claim 1 or 2, including polyethylene terephthalate (PET).

9. The film, The battery module according to claim 1 or 2, which is a thermally conductive film.

10. A film arranging step of arranging a film on a part of the bottom surface of the cell stack, A resin arranging step of arranging an adhesive resin between the bottom surface of the cell stack and the frame, An inserting step of inserting the cell stack into the inside of the frame, a method for manufacturing a battery module including the same.

11. The film arranging step, The method for manufacturing a battery module according to claim 10, wherein the film is arranged so as to cover both end portions in the longitudinal direction at the bottom surface of the cell stack.

12. The resin arrangement step is The method for manufacturing a battery module according to claim 10 or 11, wherein the adhesive resin is applied to the bottom surface of the frame, and the adhesive resin is arranged between the bottom surface of the cell laminate and the frame.

13. The resin arrangement step is The method for manufacturing a battery module according to claim 10 or 11, wherein the adhesive resin is injected through a hole formed in the bottom surface of the frame, and the adhesive resin is arranged between the bottom surface of the cell laminate and the frame.

Images