KR101826861B1 - Secondary Battery and Battery Module Having the Same - Google Patents

Abstract

The present invention relates to a battery module including at least two battery cells having electrode terminals protruded toward one side or both sides thereof, comprising: a pair of cover members surrounding both sides of a battery cell stack body based on electrode terminals; An elastic pad interposed in at least one of a space between the cover member and the battery cell and a space between the battery cells; And a pair of frame members that cover the outer circumferential surface of the battery cell stack body and engage with the cover members and the elastic pad.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a secondary battery and a battery module including the secondary battery.

The present invention relates to a battery module including at least two battery cells having electrode terminals protruded toward one side or both sides thereof, the battery module comprising: a pair of cover members surrounding both sides of the battery cell stack body based on electrode terminals; An elastic pad interposed in at least one of a space between the battery cells and a space between the battery cells; And a pair of frame members that cover the outer circumferential surface of the battery cell stack body and engage with the cover members and the elastic pad.

Due to the development of technology and demand for mobile devices, the demand for secondary batteries is also rapidly increasing. Among them, lithium secondary batteries, which have high energy density, high operating voltage and excellent storage and life characteristics, It is widely used as an energy source.

The secondary battery is roughly classified into a cylindrical battery, a prismatic battery and a pouch-shaped battery according to the structural characteristics of the outside and the inside. Among them, the secondary battery can be stacked with a high degree of integration, and prismatic batteries and pouch- .

In addition, the secondary battery is attracting attention as an energy source for electric vehicles, hybrid electric vehicles, and the like, which is proposed as a solution for air pollution in existing gasoline vehicles and diesel vehicles using fossil fuels. Therefore, the application of the secondary battery is diversifying due to the advantages of the secondary battery, and it is expected that the secondary battery will be applied to many fields and products in the future.

As the application fields and products of the secondary battery are diversified, the type of the battery is also diversified to provide an appropriate output and capacity. In addition, there is a strong demand for miniaturization and weight reduction of cells applied to the field and products.

For example, a small mobile device such as a mobile phone, a PDA, a digital camera, a notebook computer, etc., has one or a few small and light-weight battery cells per device corresponding to the tendency to miniaturize the products. On the other hand, a middle- or large-sized device such as an electric vehicle or a hybrid electric vehicle uses a battery module (also referred to as a "middle- or large-sized battery pack") in which a large number of battery cells are electrically connected, The size and weight of the battery are directly related to the accommodation space and the output of the mid- to large-sized devices, manufacturers are trying to manufacture a battery module as small and light as possible.

Fig. 1 schematically shows a perspective view of a typical conventional pouch-type battery. The pouch-shaped battery 10 of Fig. 1 has a structure in which two electrode leads 11 and 12 protrude from the upper end and the lower end of the battery body 13, facing each other. The housing member 14 is composed of two upper and lower units and includes both side faces 14a and an upper end portion and a lower end portion 14b which are in contact with each other in a state in which an electrode assembly (not shown) is housed in a housing portion 15 formed on the inner surface thereof. 14b, and 14c are adhered to each other. The exterior member 14 is made of a laminate structure of a resin layer / metal foil layer / resin layer so that heat and pressure are applied to both side surfaces 14a and upper and lower ends 14b and 14c which are in contact with each other, In some cases, it may be bonded using an adhesive. Both side surfaces 14a are in direct contact with the same resin layer of the upper and lower sheathing members 14, so that they can be uniformly sealed by melting. On the other hand, since the electrode leads 11 and 12 protrude from the upper end portion 14b and the lower end portion 14c, the sealability is improved in consideration of the thickness of the electrode leads 11 and 12 and the heterogeneity with the material of the outer sheath member 14 The electrode leads 11 and 12 are thermally fused with a film-like sealing member 16 therebetween.

However, since the battery main body 13 is repeatedly expanded and contracted during the charging and discharging process of the pouch-shaped battery 10, the heat-sealed portions of the upper end portion 14a and the lower end portion 14c, particularly the both side surfaces 14b, But the mechanical rigidity of the exterior member 14 itself is not excellent. In order to solve such a problem, in some prior arts, there is a method in which the outer sealing portion of the exterior member 14 is coated again with an epoxy resin, a silicone resin or the like, or a sealing film or the like is attached thereto to improve the sealing property, A method is used in which a battery is mounted on a separate member (such as a cartridge) and laminated.

However, the method using a separate sealing member has a complicated working process and has a structure that is not suitable for forming a middle- or large-sized battery pack using these batteries. In the case of using a cartridge or the like, the total weight and size And the assembling process is complicated.

In addition, due to inherent characteristics of the lithium secondary battery, not only the manufacturing process of the battery cell, but also the continuous use, that is, the power generation element and the electrical connecting member are gradually deteriorated in the continuous charging / discharging process. For example, The electrode material, the electrolyte, and the like to generate a gas, whereby the battery cell (can and pouch-shaped case) gradually expands. That is, since the middle- or large-sized battery pack generally has a structure in which a plurality of battery cells are fixedly mounted in a certain case, each of the expanded battery cells is further pressurized in a limited case and ignited and exploded under abnormal operating conditions. The risk is greatly increased.

Therefore, there is a high need for a technique capable of fundamentally solving such problems.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art and the technical problems required from the past.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a battery module in which when an elastic pad that provides a predetermined elastic force is interposed between battery cells mounted on the battery module, abnormal operation of the battery module such as overcharge, over- Even if the battery cell expands due to the deterioration due to the discharge, the elastic pad shrinks, thereby confirming that the safety of the battery module can be secured to a desired level.

Accordingly, it is an object of the present invention to provide a secondary battery having a specific structure capable of improving safety and a battery module including the secondary battery.

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided a battery module including at least two battery cells protruding from one or both sides of a battery cell, A pair of cover members; An elastic pad interposed in at least one of a space between the cover member and the battery cell and a space between the battery cells; And a pair of frame members that cover the outer circumferential surface of the battery cell stack body and engage with the cover members and the elastic pad.

Therefore, even if the battery cell expands due to frequent charge and discharge, it is possible to secure the structural safety of the battery cell by applying an elastic pad having a specific structure between the battery cells to shrink the battery cell by a size corresponding to the expanded volume have.

In one preferred embodiment, the battery cell may be a plate-shaped battery cell having a relatively large width and a width in terms of thickness, and preferably has a width in the range of 10 to 20 times the thickness of the battery cell and a width in the range of 30 to 40 A structure having a width is preferable. In a specific example, when the thickness of the battery cell is 5 mm, the width and width of the battery cell may be 110 mm and 220 mm, respectively.

The battery cell may have a structure in which an electrode assembly is embedded in a pouch case of a laminate sheet including a resin layer and a metal layer, and a specific structure of the secondary battery will be described in detail below.

A typical lithium secondary battery is composed of a positive electrode, a negative electrode, a separator, and a non-aqueous electrolyte containing a lithium salt.

The positive electrode is prepared, for example, by coating a mixture of a positive electrode active material, a conductive material and a binder on a positive electrode current collector, and then drying the mixture. Optionally, a filler may be further added to the mixture.

The cathode active material may be a layered compound such as lithium cobalt oxide (LiCoO ₂ ), lithium nickel oxide (LiNiO ₂ ), or a compound substituted with one or more transition metals; Lithium manganese oxides such as Li _{1 + x} Mn _{2 -x} O ₄ (where x is 0 to 0.33), LiMnO ₃ , LiMn ₂ O ₃ , LiMnO ₂ and the like; Lithium copper oxide (Li ₂ CuO ₂ ); Vanadium oxides such as LiV ₃ O ₈ , LiFe ₃ O ₄ , V ₂ O ₅ and Cu ₂ V ₂ O ₇ ; A Ni-site type lithium nickel oxide expressed by the formula LiNi _1-x M _x O ₂ (where M = Co, Mn, Al, Cu, Fe, Mg, B or Ga and x = 0.01 to 0.3); Formula _{LiMn 2-x M x O 2} ( where, M = Co, Ni, Fe , Cr, and Zn, or Ta, x = 0.01 ~ 0.1 Im) or Li ₂ Mn ₃ MO ₈ (where, M = Fe, Co, Ni, Cu, or Zn); LiMn ₂ O _{4 in} which a part of Li in the formula is substituted with an alkaline earth metal ion; Disulfide compounds; Fe ₂ (MoO ₄ ) ₃ , and the like. However, the present invention is not limited to these.

The conductive material is usually added in an amount of 1 to 30% by weight based on the total weight of the mixture including the cathode active material. Such a conductive material is not particularly limited as long as it has electrical conductivity without causing chemical changes in the battery, for example, graphite such as natural graphite or artificial graphite; Carbon black such as carbon black, acetylene black, ketjen black, channel black, furnace black, lamp black, and summer black; Conductive fibers such as carbon fiber and metal fiber; Metal powders such as carbon fluoride, aluminum, and nickel powder; Conductive whiskey such as zinc oxide and potassium titanate; Conductive metal oxides such as titanium oxide; Conductive materials such as polyphenylene derivatives and the like can be used.

The binder is a component which assists in bonding of the active material and the conductive material and bonding to the current collector, and is usually added in an amount of 1 to 30% by weight based on the total weight of the mixture containing the cathode active material. Examples of such binders include polyvinylidene fluoride, polyvinyl alcohol, carboxymethylcellulose (CMC), starch, hydroxypropylcellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene , Polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butylene rubber, fluorine rubber, various copolymers and the like.

The filler is optionally used as a component for suppressing the expansion of the anode, and is not particularly limited as long as it is a fibrous material without causing a chemical change in the battery. Examples of the filler include olefin polymers such as polyethylene and polypropylene; Fibrous materials such as glass fibers and carbon fibers are used.

The negative electrode is manufactured by applying and drying a negative electrode active material on a negative electrode collector, and if necessary, the above-described components may be selectively included.

Examples of the negative electrode active material include carbon such as non-graphitized carbon and graphite carbon; _{Li x Fe 2 O 3 (0≤x≤1} ), Li x WO 2 (0≤x≤1), Sn x Me 1-x Me 'y O z (Me: Mn, Fe, Pb, Ge; Me' : Metal complex oxides such as Al, B, P, Si, Group 1, Group 2, Group 3 elements of the periodic table, Halogen, 0 < x &lt; Lithium metal; Lithium alloy; Silicon-based alloys; Tin alloy; _{SnO, SnO 2, PbO, PbO} 2, Pb 2 O 3, Pb 3 O 4, Sb 2 O 3, Sb 2 O 4, Sb 2 O 5, GeO, GeO 2, Bi 2 O 3, Bi 2 O 4, and Bi ₂ O ₅ ; Conductive polymers such as polyacetylene; Li-Co-Ni-based materials and the like can be used.

The separation membrane is interposed between the anode and the cathode, and an insulating thin film having high ion permeability and mechanical strength is used. The pore diameter of the separator is generally 0.01 to 10 micrometers and the thickness is generally 5 to 300 micrometers. Such separation membranes include, for example, olefinic polymers such as polypropylene, which are chemically resistant and hydrophobic; A sheet or nonwoven fabric made of glass fiber, polyethylene or the like is used. When a solid electrolyte such as a polymer is used as an electrolyte, the solid electrolyte may also serve as a separation membrane.

The non-aqueous electrolyte solution containing a lithium salt is composed of a polar organic electrolyte and a lithium salt. As the electrolytic solution, a non-aqueous liquid electrolytic solution, an organic solid electrolyte, an inorganic solid electrolyte and the like are used.

Examples of the nonaqueous liquid electrolytic solution include N-methyl-2-pyrrolidinone, propylene carbonate, ethylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, gamma -Butyrolactone, 1,2-dimethoxyethane, tetrahydroxyfuran, 2-methyltetrahydrofuran, dimethylsulfoxide, 1,3-dioxolane, formamide, dimethylformamide, dioxolane , Acetonitrile, nitromethane, methyl formate, methyl acetate, triester phosphate, trimethoxymethane, dioxolane derivatives, sulfolane, methylsulfolane, 1,3-dimethyl-2-imidazolidinone, propylene carbonate Nonionic organic solvents such as tetrahydrofuran derivatives, ethers, methyl pyrophosphate, ethyl propionate and the like can be used.

Examples of the organic solid electrolyte include a polymer electrolyte such as a polyethylene derivative, a polyethylene oxide derivative, a polypropylene oxide derivative, a phosphate ester polymer, an agitation lysine, a polyester sulfide, a polyvinyl alcohol, a polyvinylidene fluoride, Polymers containing ionic dissociation groups, and the like can be used.

Examples of the inorganic solid electrolyte include Li ₃ N, LiI, Li ₅ NI ₂ , Li ₃ N-LiI-LiOH, LiSiO ₄ , LiSiO ₄ -LiI-LiOH, Li ₂ SiS ₃ , Li ₄ SiO ₄ , Nitrides, halides and sulfates of Li such as Li ₄ SiO ₄ -LiI-LiOH and Li ₃ PO ₄ -Li ₂ S-SiS ₂ can be used.

The lithium salt is a material that is readily soluble in the non-aqueous electrolyte, for example, LiCl, LiBr, LiI, LiClO 4, LiBF 4, LiB 10 Cl 10, LiPF 6, LiCF 3 SO 3, LiCF 3 CO 2, LiAsF _{6, LiSbF 6, LiAlCl 4,} CH 3 SO 3 Li, CF 3 SO 3 Li, (CF 3 SO 2) 2 NLi, chloroborane lithium, lower aliphatic carboxylic acid lithium, lithium tetraphenyl borate and imide have.

For the purpose of improving the charge-discharge characteristics and the flame retardancy, the non-aqueous liquid electrolyte may contain, for example, pyridine, triethylphosphite, triethanolamine, cyclic ether, ethylenediamine, glyme, N, N-substituted imidazolidine, ethylene glycol dialkyl ether, ammonium salt, pyrrole, 2-methoxyethanol, aluminum trichloride and the like are added It is possible. In some cases, a halogen-containing solvent such as carbon tetrachloride or ethylene trifluoride may be further added to impart nonflammability, or a carbon dioxide gas may be further added to improve high-temperature storage characteristics.

In the above structure, the battery cell is preferably a structure in which the outer circumferential surface of the pouch case is sealed by heat fusion or adhesion.

In one preferred example, the cover member is made of a metal plate material, and the frame member may be a structure made of plastic. In a specific example, the frame member may be a structure integrally formed by injection molding.

It is preferable that the outer circumferential surface of the cover member has a step recessed in the direction of the battery cell stack body.

The elastic pad may be a structure made of rubber or silicone resin, but is not limited thereto. Preferably, the elastic pad is a ring-shaped structure having a central opening and a close contact with the outer surface of the battery cell. .

In one preferred embodiment, the elastic pad may have a structure including a first pad interposed in a space between the cover member and the battery cell, and a second pad interposed in a space between the battery cells, Wherein the elastic pad includes a first elastic pressing portion which is in close contact with a sealing portion of the battery cell and a second elastic pressing portion which extends from the first elastic pressing portion and which presses the inside of the sealing portion of the battery cell And a second elastic pressing portion for pressing the second elastic pressing portion.

Therefore, the elastic pad is formed in a shape corresponding to the outer surface of the battery cell, whereby the elastic pad is effectively adhered to the portion where the sealing portion of the battery cell is formed.

In this structure, the inside of the sealing portion of the battery cell extends from the sealing portion in the direction toward the center of the battery cell, and preferably, the inside of the sealing portion is about 5 To 50% by volume.

In one preferred embodiment, the height of the first elastic pressing portion is 50 to 150% of the thickness of the battery cell, and the height of the second elastic pressing portion is 3 to 30% of the size of the first elastic pressing portion. have.

In one specific example, the frame members may be a structure that covers only the outer circumferential surfaces of the cover members, the battery cell stack and the elastic pad, and preferably the inner surfaces of the frame members are provided with cover members, a battery cell stack, Grooves into which the outer circumferential surface of the pad is inserted may be formed.

Each of the frame members may have a flat U-shaped structure.

In a specific example, the frame members may have a structure in which the frame members are mutually fastened at electrode terminal portions of the battery cells, and in one example, the frame members may have a fastening hook structure or a bolt fastening structure.

The frame members may have through-holes for exposing the electrode terminals of the battery cells.

The present invention also provides a device using the battery module as a power source.

A preferred example of a device in which the battery module according to the present invention can be used is a vehicle or a power storage device having a limited mounting space and exposed to frequent vibration and strong impact, but is not limited thereto.

The structure and manufacturing method of such a device are well known in the art, so a detailed description thereof will be omitted herein.

As described above, according to the battery module of the present invention, even if the battery cell expands through an elastic pad having an elastic force between the battery cells mounted on the battery module, The battery module can be prevented from exploding or igniting by shrinking to a size corresponding to the expanding size.

In addition, since the stepped portion of the elastic pad is located on the sealing part, the battery module according to the present invention can fundamentally block micro cracks or the like that may occur at the end of the sealing part, .

1 is a perspective view of a typical pouch type battery of the related art;
2 is a perspective view of a pouch type secondary battery according to an embodiment of the present invention;
3 is a perspective view of a battery module according to one embodiment of the present invention;
4 to 6 are exploded perspective views of a battery module according to an embodiment of the present invention;
Figures 7 and 8 are vertical cross-sectional views of A-A 'in Figure 3 and B-B' in Figure 5;
9 is a perspective view of an elastic pad according to one embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings according to the embodiments of the present invention, but the scope of the present invention is not limited thereto.

2 is a perspective view of a pouch type secondary battery according to an embodiment of the present invention.

Referring to FIG. 2, the plate-shaped battery cell 100 has a structure in which a battery case 110 of a laminate sheet is sealed with an electrode assembly (not shown) incorporated therein. Electrode leads 170 and 180 protrude from the upper end 120 of the battery case 110. The upper portion 120, the side surface 130, and the lower portion 150 constitute the sealing portion 132 by fusion bonding of the battery case 110.

3 is a perspective view of a battery module according to an embodiment of the present invention, and FIGS. 4 to 6 are schematics of exploded perspective views of a battery module according to an embodiment of the present invention have.

2, the battery module 500 according to the present invention includes the battery cells 100, 110, and 120, elastic pads 400, 410, 420, and 430 interposed between the battery cells, A pair of cover members 200 for covering the upper and lower portions of the battery cells 100, 110 and 120 stacked in the vertical direction and a pair of cover members 200 for covering the outer peripheral surfaces of the battery cells 100, And a pair of frame members 300 and 310 that are coupled to the pads 400, 410, 420, and 430 and the cover members 200 and 210, respectively.

The elastic pads 400, 410, 420, and 430 may include first pads 400 and 430 interposed between the cover members 200 and 210 and the battery cells 100 and 110 and 120, And second pads 410 and 420 interposed between the first and second electrodes 100 and 100, respectively.

Specifically, electrode terminals 170 and 180 are formed on one side of the first battery cell 100 to the third battery cell 120, and the electrode terminals 170 and 180 protrude in the same direction In the vertical direction.

The first cover member 200 is made of a metal plate so as to surround both sides of the first battery cell 100 and the second cover member 210 is installed to cover both sides of the third battery cell 120 have.

The first to fourth elastic pads 400 to 430 are disposed between the first and second battery cells 100 to 120 mounted between the first cover member 200 and the second cover member 200, As shown in Fig.

In this structure, the first frame member 300 and the second frame member 310 are formed of a rubber material having elasticity, and the first battery cell 100 to the third battery cell 120 and the first elastic pad 400 to the fourth elastic pad 430 at the side of the fourth elastic pad 430.

The structure of the battery module 500 will be described in more detail below.

FIGS. 7 and 8 show vertical cross-sectional views AA 'and B-B' of FIG. 3 and FIG. 9, respectively, with a perspective view of an elastic pad according to one embodiment of the present invention .

2 through 6, the battery module 500 will be described in detail. A sealing portion 132 is formed on the outer circumferential surface of the first battery cell 100, and the first battery cell 100 The first cover member 200 is mounted on the upper surface thereof so as to surround the sealing portion 132 of the first cover member 200. [ The first cover member 200 has a stepped portion 201 recessed in a shape corresponding to the sealing portion 132. Similarly, a sealing portion 132 is formed on the outer circumferential surface of the third battery cell 120, and a second cover member 210 is mounted on the bottom surface of the third battery cell 120 so as to surround the sealing portion 132 of the third battery cell 120 have. The second cover member 210 is formed with a step 201 recessed in a shape corresponding to the sealing portion 132.

The first elastic pad 400 is interposed between the first cover member 200 and the first battery cell 100 and the second elastic pad 410 and the third elastic pad 420 are interposed between the first battery cell 100 100 and the second battery cell 110 and between the second and third battery cells 110 and 120. The fourth elastic pad 430 is interposed between the third battery cell 120 and the third battery cell 120, 2 cover member 210. [0034]

The first elastic pad 400 includes a first elastic pressing portion 401 which is in close contact with the sealing portion 132 of the first battery cell 100 and a second elastic pressing portion 401 which is located inside the sealing portion 132 of the first battery cell 110 And the second elastic pad 410 to the fourth elastic pad 430 are formed in the same structure as that of the second elastic pad 410. Therefore, a description thereof will be omitted.

In the battery module 500, the first cover member 200 and the second cover member 210 mounted on the upper and lower surfaces of the battery module 500 are pressed by a jig (not shown) The first frame member 300 and the second frame member 310 are slidingly coupled to each other.

The first to third battery cells 100 to 120 and the first to fourth elastic members 400 to 430 are interposed between the first frame member 300 and the second frame member 310 Grooves 301 are formed on the inner surface of the first cover member 200 and the outer circumferential surface of the second cover member 210 so that the first cover member 200 and the second cover member 210 are slidably engaged with each other. The through holes 302 are formed in the second frame member 310 so that the electrode terminals 170 and 180 of the first through third battery cells 100 through 120 are exposed to the outside.

The first frame member 300 and the second frame member 310 are coupled to each other by a hook member (not shown) and are fastened to each other in an interference fit manner. The second frame member 310 and the second frame member 310 are coupled to each other so as to surround only the outer surfaces of the cover members 200 and 210, the battery cells 100, 110 and 120 and the elastic pads 400, 410, 420 and 430.

The first to third battery cells 100 to 300 are provided in the first frame member 300 of the battery module 500 and the grooves 301 and the through holes 302 formed in the second frame member 310, Since the outer circumferential surface of the electrode terminal 120 and the electrode terminals 170 and 180 are easily slidably coupled, assembly is facilitated without a fastening member such as a bolt.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, will be.

Claims (21)

A battery module comprising at least two battery cells having electrode terminals protruded from one side or both sides thereof,
A pair of cover members surrounding both side surfaces of the battery cell stack body with respect to the electrode terminals;
An elastic pad interposed in a space between the cover member and the battery cell and in a space between the battery cells; And
And a pair of frame members that cover the outer circumferential surface of the battery cell stack body and engage with the cover members and the elastic pad,
The elastic pad includes a first pad interposed in a space between the cover member and the battery cell and a second pad interposed in a space between the battery cells,
The first and second pads each have a ring shape that is open at a central portion and is in close contact with the outer surface of the battery cell,
Wherein the frame members are configured to surround only the outer peripheral surfaces of the cover members, the battery cell stack, and the elastic pad. The battery module according to claim 1, wherein the battery cell is a plate-shaped battery cell having a width and a width relatively larger than a thickness of the battery cell. The battery module according to claim 1, wherein the battery cell has a structure in which an electrode assembly is embedded in a pouch case of a laminate sheet including a resin layer and a metal layer. The battery module according to claim 3, wherein the battery cell has a structure in which an outer circumferential surface of the pouch case is sealed by heat sealing or adhesion. The battery module according to claim 1, wherein the cover member is made of a metal plate, and the frame member is made of plastic. The battery module according to claim 1, wherein an outer circumferential surface of the cover member forms a recessed step in the direction of the battery cell stack. The battery module according to claim 1, wherein the elastic pad is made of rubber or silicone resin. delete delete The battery pack according to claim 1, wherein the battery cell includes a sealing portion on an outer circumferential surface thereof, the elastic pad includes a first elastic pressing portion that is in close contact with a sealing portion of the battery cell, and a second elastic pressing portion that extends from the first elastic pressing portion, And a second elastic pressing portion for pressing the inside of the battery module. The battery module according to claim 10, wherein the inside of the sealing portion of the battery cell is a portion extending from the sealing portion in a direction toward the center of the battery cell. The battery module according to claim 11, wherein the inside of the sealing portion is 5 to 50% of the distance between the center of the battery cell and the sealing portion. 11. The battery pack according to claim 10, wherein a height of the first elastic pressing portion is 50 to 150% of a thickness of the battery cell, and a height of the second elastic pressing portion is 3 to 30% Battery module. delete The battery module according to claim 1, wherein grooves are formed in the inner surfaces of the frame members to insert the outer surfaces of the cover members, the battery cell stack, and the elastic pad. The battery module according to claim 1, wherein each of the frame members is a flat U-shaped structure. The battery module according to claim 1, wherein the frame members are mutually coupled at electrode terminal portions of the battery cells. 18. The battery module of claim 17, wherein the frame members are of a fastening hook structure or a bolt fastening structure. The battery module according to claim 1, wherein the frame members are formed with through-holes for exposing electrode terminals of the battery cells. A device comprising a battery module according to claim 1. 21. The device of claim 20, wherein the device is a vehicle or a power storage device.

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