Battery module

Abstract

This provides a battery module that can suppress damage to the pouch. [Solution] The battery module comprises a battery cell stack in which a plurality of battery cells are stacked, and a first elastic member 14A positioned between the plurality of battery cells. The first elastic member 14A comprises a pouch 20 that has a first sealing portion 21A and a second sealing portion 21B at both ends in a direction perpendicular to the stacking direction of the battery cells, and is filled with gas. The non-facing region N of the region between the first sealing portion 21A and the second sealing portion 21B that does not face the battery cells is reinforced with a reinforcing member 41.

Description

[Technical Field]

[0001] This invention relates to a battery module. [Background technology]

[0002] In recent years, research and development has been conducted on battery modules that contribute to energy efficiency, in order to ensure that more people have access to affordable, reliable, sustainable, and advanced energy.

[0003] Patent Document 1 describes a module containing a flat-type secondary battery. In this module, a module casing that pressurizes and fixes the flat-type secondary battery is placed between the module casing and the flat-type secondary battery, with a fluid-containing bag that seals and encloses a fluid in between. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2003-303579 [Overview of the project] [Problems that the invention aims to solve]

[0005] However, when the fluid-containing bag described in Patent Document 1 is placed between multiple battery cells, the fluid-containing bag is prone to damage because the battery cells expand and contract as they charge and discharge.

[0006] The present invention aims to provide a battery module that can suppress damage to the pouch. [Means for solving the problem]

[0007] (1) A battery module comprising a battery cell stack in which a plurality of battery cells are stacked, and an elastic member disposed between the plurality of battery cells, wherein the elastic member comprises a pouch containing gas, having a first sealing portion and a second sealing portion at both ends in a direction perpendicular to the stacking direction of the battery cells, and the region between the first sealing portion and the second sealing portion of the pouch that does not face the battery cells is reinforced with a reinforcing member.

[0008] (2) The battery module according to (1), wherein the ratio of the width of the reinforcing member to the length of the non-facing region when the elastic member is viewed in cross-section from a direction perpendicular to the stacking direction of the battery cells is 1.0 or more.

[0009] (3) The battery module according to (1) or (2), wherein the ratio of the width of the reinforcing member to the length of the pouch in the direction perpendicular to the stacking direction of the battery cells is 0.001 or more and 0.05 or less.

[0010] (4) The battery module according to any one of (1) to (3), wherein the ratio of the thickness of the reinforcing member to the thickness of the pouch is 0.03 or more and 0.20 or less.

[0011] (5) When the elastic member is viewed in cross-section from a direction perpendicular to the stacking direction of the battery cells, the length of the non-facing region is x0 [mm], and the internal pressure of the pouch is y [N / mm]. 2 If so, the reinforcing member has a tensile strength of x0 × y [N / mm] or more, as described in any one of (1) to (4).

[0012] (6) The battery module described in (5), wherein x0 × y is 1 N / mm or more and 20 N / mm or less.

[0013] (7) A battery module as described in (5) or (6), wherein x0 is 1.0 mm or more and 4.0 mm or less.

[0014] (8) The battery module according to any one of (1) to (7), wherein the pouch has an internal pressure of 0.1 MPa or more and 3.0 MPa or less.

[0015] (9) The battery module according to any one of (1) to (8), wherein a ratio of a length of the non-facing region in a direction perpendicular to the stacking direction of the battery cells to a length of the pouch in the direction perpendicular to the stacking direction of the battery cells is 0.001 or more and 0.01 or less.

[0016] (10) The battery module according to any one of (1) to (9), wherein the reinforcing member has a tensile strength of 1 N / mm or more.

[0017] (11) The battery module according to any one of (1) to (10), wherein the non-facing region reinforced by the reinforcing member has a tensile strength of 1 N / mm or more and 40 N / mm or less.

[0018] (12) The battery module according to any one of (1) to (12), wherein the reinforcing member contains a resin.

[0019] (13) The battery module according to any one of (1) to (12), wherein the elastic member further comprises a first support member supporting at least a part of the first sealing portion, and a second support member supporting at least a part of the second sealing portion.

[0020] (14) The battery module according to any one of (1) to (13), wherein the elastic member further comprises elastic foams disposed on both sides of the pouch in the stacking direction of the battery cells.

[0021] (15) The battery module according to any one of (1) to (14), wherein the battery cell includes a cell comprising a negative electrode mixture layer containing lithium metal or a lithium alloy, a solid electrolyte layer, and a positive electrode mixture layer. Effects of the Invention

[0022] According to the present invention, it is possible to provide a battery module capable of suppressing breakage of a pouch. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] [Figure 1] It is a side view showing a battery module according to one embodiment of the present invention. [Figure 2A] It is a partially enlarged perspective view of the battery module of FIG. 1. [Figure 2B] It is a schematic diagram showing a cross section taken along line A-A of FIG. 2A. [Figure 2C] It is a schematic diagram showing a cross section taken along line B-B of FIG. 2A. [Figure 3] It is a partially enlarged schematic diagram of the first elastic member in FIG. 2B. DETAILED DESCRIPTION OF EMBODIMENTS FOR CARRYING OUT THE INVENTION

[0024] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0025] [Battery Module] FIG. 1 shows a battery module according to one embodiment of the present invention.

[0026] The battery module 10 includes battery cell stacks 11A and 11B in which a plurality of battery cells 11 are stacked, end plates 12A and 12B provided at both ends in the stacking direction of the battery cell stacks 11A and 11B, and a center plate 12C provided between the battery cell stacks 11A and 11B. The battery module 10 further includes bind bars 13A and 13B that restrain the battery cell stacks 11A and 11B between the end plates 12A and 12B. The restraining pressure by the bind bars 13A and 13B is not particularly limited, and is, for example, 1.0 MPa or more and 2.5 MPa or less.

[0027] The battery module 10 has a first elastic member 14A positioned between a plurality of battery cells 11, and a second elastic member 14B positioned between the battery cell stack 11A and the end plate 12A and center plate 12C, and between the battery cells 11 and the end plate 12B and center plate 12C. In this case, since the second elastic member 14B is in contact with one battery cell 11, it is not particularly limited as long as it has more than half the elasticity of the first elastic member 14A, which is in contact with two battery cells 11. From the viewpoint of the energy density of the battery module 10, it is preferable that the second elastic member 14B has the same configuration as the first elastic member 14A except that its thickness is half, but it may also be identical to the first elastic member 14A.

[0028] As shown in Figures 2A and 2B, the first elastic member 14A comprises a pouch 20 containing gas, having a first sealing portion 21A and a second sealing portion 21B at both ends in the longitudinal direction (AA direction) perpendicular to the stacking direction of the battery cells 11, a first support member 22A that supports the entire area of ​​the first sealing portion 21A, and a second support member 22B that supports the entire area of ​​the second sealing portion 21B. Note that in Figure 2A, the battery cells 11 and the elastic foams 23A and 23B, which will be described later, are omitted from the description.

[0029] At this time, the first support member 22A and the second support member 22B are positioned by a positioning member installed on the battery module 10, for example.

[0030] As shown in Figure 3, the pouch 20 is reinforced by a reinforcing member 41 in the non-facing region N between the first sealing portion 21A and the second sealing portion 21B, which does not face the battery cell 11 (i.e., does not face the elastic foam 23A or 23B). Therefore, even if the battery cell 11 expands and contracts due to charging and discharging, damage to the pouch 20 is suppressed. The shape of the non-facing region N is not particularly limited and may be planar or curved.

[0031] When the first elastic member 14A is viewed in cross-section from the longitudinal direction (AA direction) perpendicular to the stacking direction of the battery cells 11, the ratio (w / x0) of the width (w) of the reinforcing member 41 to the length (x0) of the non-opposing region N is preferably 1.0 or more. When w / x0 is 1.0 or more, the entire non-opposing region N is reinforced by the reinforcing member 41. Note that w / x0 is, for example, 10.0 or less.

[0032] The ratio (w / l) of the width (w) of the reinforcing member 41 to the length (l) in the longitudinal direction (AA direction) perpendicular to the stacking direction of the battery cells 11 in the pouch 20 is preferably 0.001 or more and 0.05 or less, more preferably 0.002 or more and 0.02 or less, and even more preferably 0.005 or more and 0.006 or less. When w / l is 0.001 or more, the entire non-facing region N is reinforced by the reinforcing member 41, and when it is 0.05 or less, the energy density of the battery module 10 is increased.

[0033] In this case, the length (x0) of the non-opposing region N is greater than the length (x) of the non-opposing region N in the longitudinal direction (AA direction) perpendicular to the stacking direction of the battery cells, but it is preferable that x / x0 is between 0.5 and 0.9.

[0034] The thickness of the pouch 20, that is, the ratio of the thickness of the reinforcing member 41 to the spacing between the elastic foams 23A and 23B, is preferably 0.03 or more and 0.20 or less, and more preferably 0.06 or more and 0.12 or less. When the ratio of the thickness of the reinforcing member 41 to the thickness of the pouch 20 is 0.03 or more, damage to the pouch 20 is more easily suppressed even when the battery cells 11 expand and contract with the charging and discharging of the battery cells 11, and when it is 0.20 or less, the energy density of the battery module 10 is increased.

[0035] When the first elastic member 14A is viewed in cross-section from the longitudinal direction (AA direction) perpendicular to the stacking direction of the battery cell 11, the length of the non-facing region N is x0 [mm], and the internal pressure of the pouch 20 is y [N / mm]. 2In this case, the tensile strength of the reinforcing member 41 is preferably x0 × y [N / mm] or greater. This makes it easier to suppress damage to the pouch 20 even when the battery cell 11 expands and contracts. In this case, x0 × y is preferably 1 N / mm or more and 20 N / mm or less, and more preferably 10 N / mm or more and 20 N / mm or less.

[0036] x0 is preferably 1.0 mm or more and 4.0 mm or less, and more preferably 1.5 mm or more and 3.0 mm or less. If x0 is 1.0 mm or more, damage to the pouch 20 is less likely to be suppressed even if the battery cell 11 expands and contracts as the battery cell 11 is charged and discharged, and if it is 4.0 mm or less, the energy density of the battery module 10 is increased.

[0037] The internal pressure of the pouch 20 is preferably between 0.1 MPa and 3.0 MPa, and more preferably between 0.1 MPa and 2.5 MPa. When the internal pressure of the pouch 20 is 0.1 MPa or higher, the uniformity of the surface pressure of the first elastic member 14A is increased, and when it is 3.0 MPa or lower, damage to the pouch 20 is more easily suppressed even if the battery cells 11 expand and contract as the battery cells 11 are charged and discharged.

[0038] The ratio (x / l) of the length (x) of the non-facing region N in the longitudinal direction (AA direction) perpendicular to the stacking direction of the battery cells 11 to the length (l) of the pouch 20 in the longitudinal direction (AA direction) perpendicular to the stacking direction of the battery cells 11 is preferably 0.001 or more and 0.01 or less, and more preferably 0.001 or more and 0.005 or less. When x / l is 0.001 or more and 0.01 or less, damage to the pouch 20 is more easily suppressed even if the battery cells 11 expand and contract with charging and discharging of the battery cells 11.

[0039] The tensile strength of the reinforcing member 41 is preferably 1 N / mm or more, and more preferably 4 N / mm or more. When the tensile strength of the reinforcing member 41 is 1 N / mm or more, damage to the pouch 20 is more easily suppressed even when the battery cell 11 expands and contracts. The tensile strength of the reinforcing member 41 is, for example, 100 N / mm or less.

[0040] The tensile strength of the non-opposing region N reinforced by the reinforcing member 41 is preferably 1 N / mm or more and 40 N / mm or less, and more preferably 10 N / mm or more and 40 N / mm or less. When the tensile strength of the non-opposing region N reinforced by the reinforcing member 41 is 1 N / mm or more and 40 N / mm or less, damage to the pouch 20 is more easily suppressed even when the battery cell 11 expands and contracts due to charging and discharging of the battery cell 11.

[0041] The adhesive strength of the reinforcing member 41 is preferably 0.1 N / mm or more and 1.0 N / mm or less, and more preferably 0.3 N / mm or more and 0.5 N / mm or less. When the adhesive strength of the reinforcing member 41 is 0.1 N / mm or more and 1.0 N / mm or less, damage to the pouch 20 is more easily suppressed even if the battery cell 11 expands and contracts due to charging and discharging of the battery cell 11.

[0042] The reinforcing member 41 preferably contains a resin. This helps to suppress damage to the pouch 20 even when the battery cell 11 expands and contracts. The resin is not particularly limited, but examples include polyethylene, polypropylene, polyvinyl chloride, polyester, polyurethane, silicone resin, ethylene propylene rubber, styrene resin, olefin resin, polyamide, polyimide, and polytetrafluoroethylene. In this case, the reinforcing member 41 may also contain a fiber-reinforced resin.

[0043] Examples of reinforcing members 41 include adhesive tape. The adhesive tape has, for example, an adhesive layer formed on the surface of a base material.

[0044] As shown in Figure 2B, the first elastic member 14A further comprises elastic foams 23A and 23B positioned on both sides of the pouch 20 in the stacking direction of the battery cell 11. In this case, when the first elastic member 14A is compressed due to the expansion of the battery cell 11 during charging, the elastic foams 23A and 23B are interposed between the battery cell 11 and the pouch 20, thereby increasing the uniformity of the surface pressure of the first elastic member 14A.

[0045] As shown in Figure 2C, the pouch 20 has a third sealing portion 21C that extends in a direction perpendicular to the stacking direction of the battery cells 11 (AA direction), and the third sealing portion 21C faces the battery cells 11. As a result, the battery cells 11 and the elastic foam 23B reinforce the third sealing portion 21C, thereby improving the durability of the battery module 10. In this case, the third sealing portion 21C is formed on one side of the pouch 20 that faces the battery cells 11, but it may also be formed on both sides of the pouch 20 that face the battery cells 11.

[0046] The pouch 20 is not particularly limited as long as it is elastic and can follow the expansion and contraction associated with the charging and discharging of the battery cell 11 and can be sealed, but for example, the aluminum film is sandwiched between stretchable resin films. The stretchable resin is not particularly limited, but examples include polypropylene, polyamide, and polyester.

[0047] The method for forming the first sealing portion 21A, the second sealing portion 21B, and the third sealing portion 21C is not particularly limited, but one method is to heat-seal the stretchable resin constituting the pouch 20.

[0048] The pouch 20 is not particularly limited, but an example is a pillow pouch (commercially available). The gas sealed in the pouch 20 is not particularly limited, but an example is air.

[0049] Alternatively, instead of pouch 20, a pouch may be used that has a first sealing portion 21A and a second sealing portion 21B at both ends in the direction perpendicular to the stacking direction of the battery cells 11 (AA direction), and has sealing portions other than the third sealing portion 21C.

[0050] The materials constituting the first support member 22A and the second support member 22B are not particularly limited, but examples include resin and metal.

[0051] The Poisson's ratio of the elastic foams 23A and 23B is preferably 0.3 or less. When the Poisson's ratio of the elastic foams 23A and 23B is 0.3 or less, the elastic foams 23A and 23B can more easily absorb the change in thickness due to the expansion and contraction of the battery cell 11. For example, the Poisson's ratio of the elastic foams 23A and 23B is 0.01 or more.

[0052] The thickness of the elastic foams 23A and 23B when the battery cell is charged to 100% is not particularly limited, but is, for example, 0.05 mm or more and 0.1 mm or less.

[0053] The porosity of the elastic foams 23A and 23B is not particularly limited, but is, for example, 30% to 95%. The materials constituting the elastic foams 23A and 23B are not particularly limited, but include, for example, polyurethane, silicone resin, ethylene propylene rubber, styrene resin, olefin resin, polyamide, and polyester.

[0054] The method for fixing the elastic foams 23A and 23B to the pouch 20 is not particularly limited, but one example is to adhere the elastic foams 23A and 23B to the pouch 20 with an elastic adhesive.

[0055] [cell] The cells constituting the battery cell 11 are not particularly limited, but examples include solid battery cells such as all-solid-state battery cells and semi-solid-state battery cells, and non-aqueous electrolyte battery cells having a negative electrode composite layer containing lithium metal or lithium alloy. The elements other than lithium that constitute the lithium alloy are not particularly limited, but examples include Sn, Ag, Mg, In, Si, and Al. Among these, from the viewpoint of energy density, a cell comprising a negative electrode composite layer containing lithium metal or lithium alloy, a solid electrolyte layer, and a positive electrode composite layer is preferred.

[0056] The following describes an example of an all-solid-state battery cell.

[0057] An all-solid-state battery cell comprises a negative electrode current collector, a negative electrode composite layer containing lithium metal or a lithium alloy, a solid electrolyte layer, a positive electrode composite layer, and a positive electrode current collector.

[0058] The materials that make up the negative electrode current collector are not particularly limited, but examples include silver, palladium, gold, platinum, aluminum, copper, nickel, stainless steel, and carbon. Among these, copper, stainless steel, and nickel are preferred from the viewpoint of conductivity and cost.

[0059] The shape of the negative electrode current collector is not particularly limited, but examples include foil-like, plate-like, mesh-like, non-woven fabric-like, and foam-like forms.

[0060] The solid electrolyte constituting the solid electrolyte layer is not particularly limited, but examples include sulfide solid electrolytes and oxide solid electrolytes.

[0061] The form of the solid electrolyte is not particularly limited, but for example, particles can be used.

[0062] The solid electrolyte content in the solid electrolyte layer is not particularly limited, but is, for example, 50% by mass or more and 99% by mass or less.

[0063] The solid electrolyte layer may further contain a binder or the like.

[0064] The method for forming the solid electrolyte layer is not particularly limited, and examples thereof include a method of applying a slurry containing a solid electrolyte and a solvent.

[0065] The positive electrode mixture layer contains a positive electrode active material. The positive electrode active material is not particularly limited, and examples thereof include lithium cobalt oxide (LiCoO₂), lithium nickel oxide (LiNiO₂), LiNi p Mn q Co r O₂ (p+q+r=1), LiNi p Al q Co r O₂ (p+q+r=1), lithium manganate (LiMn₂O₄), Li 1+x Mn 2-x-y M y O₄ (x+y=2) (wherein M is one or more elements selected from the group consisting of Al, Mg, Co, Fe, Ni and Zn), lithium titanate, and LiMPO₄ (wherein M is one or more elements selected from the group consisting of Fe, Mn, Co and Ni).

[0066] The content of the positive electrode active material in the positive electrode mixture layer is not particularly limited, and is, for example, 50 mass% or more and 99 mass% or less.

[0067] The positive electrode mixture layer may further contain a solid electrolyte. The solid electrolyte is not particularly limited as long as it can conduct lithium ions, and examples thereof include oxide solid electrolytes and sulfide solid electrolytes.

[0068] The positive electrode mixture layer may further contain a binder, a conductive aid, and the like.

[0069] The method for forming the positive electrode mixture layer is not particularly limited, and examples thereof include a method of applying a slurry containing a positive electrode active material and a solvent.

[0070] The materials used to constitute the positive electrode current collector are not particularly limited, but examples include aluminum, aluminum alloys, stainless steel, nickel, iron, and titanium. Among these, aluminum, aluminum alloys, and stainless steel are preferred.

[0071] The shape of the positive electrode current collector is not particularly limited, but examples include foil-shaped and plate-shaped.

[0072] Although embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and the above embodiments may be modified as appropriate within the scope of the spirit of the present invention. For example, the first elastic member 14A may have a first sealing portion 21A and a second sealing portion 21B at both ends in the short direction (BB direction) perpendicular to the stacking direction of the battery cell 11. [Examples]

[0073] The following describes embodiments of the present invention, but the present invention is not limited to these embodiments.

[0074] [Tensile strength] The tensile strength of the test specimen was measured using a 24G1F servo pulser (manufactured by Shimadzu Corporation) under the following conditions. The test specimen used was punched out in a dumbbell shape from the non-opposing region reinforced by the reinforcing member, considering the tensile strength of the reinforcing member itself. Test speed: 0.05 mm / s Temperature: 23℃ Chuck spacing: 110mm

[0075] [Experimental Example 1] (Pouch reinforcement) A pillow pouch was used as the pouch having a first sealing section, a second sealing section, and a third sealing section, and containing air. The pouch had a width of 92 mm, a length (l) of 528 mm, a thickness of approximately 30 mm, and an internal pressure (y) of 2.5 MPa. Next, the areas adjacent to the first sealing section and the areas adjacent to the second sealing section of the pouch were reinforced with five sheets of commercially available polyvinyl chloride adhesive tape as reinforcing members. The reinforcing members had a width (w) of 19 mm, a thickness of 4.6 mm, and a tensile strength of 4.8 N / mm or more. The non-opposing areas reinforced with the reinforcing members had a tensile strength of 13.1 N / mm.

[0076] (Fabrication of elastic members) An elastic member was obtained by bonding urethane foam (commercially available) to both sides of a reinforced pouch using an elastic adhesive. In this case, the non-opposing region had a length (x0) of 1.3 m when the elastic member was viewed in cross-section from the AA direction, and a length (x) of 1.3 mm in the AA direction.

[0077] [Comparative Experiment Example 1] An elastic member was obtained in the same manner as in Experimental Example 1, except that it was not reinforced with a reinforcing member.

[0078] [Durability] Using a 79G3F Autograph (manufactured by Shimadzu Corporation), durability tests of elastic components were conducted under the following conditions to evaluate the number of cycles required for pouch failure. Compression and recovery speed: 0.3 mm / s Compression: 2.5 MPa Restoration: 1MPa Temperature: 23℃

[0079] Table 1 shows the evaluation results for the durability of the elastic members.

[0080] [Table 1]

[0081] Table 1 shows that the elastic member in Experimental Example 1 has higher durability than the elastic member in Comparative Experimental Example 1. [Explanation of Symbols]

[0082] 10 Battery Modules 11 battery cells 11A, 11B battery cell stack 12A, 12B end plates 12C Center Plate 13A, 13B Bind Bar 14A First elastic member 14B Second Elastic Member 20 pouches 21A 1st sealing part 21B 2nd sealing part 21C 3rd sealing part 22A First support member 22B Second support member 23A, 23B Elastic foam 41 Reinforcement member N Non-opposing area

Claims

1. A battery cell stack in which multiple battery cells are stacked, The battery comprises an elastic member disposed between the plurality of battery cells, The elastic member has a first sealing portion and a second sealing portion at both ends in a direction perpendicular to the stacking direction of the battery cells, and comprises a pouch in which gas is sealed. The pouch is a battery module in which the non-facing region between the first sealing portion and the second sealing portion that does not face the battery cell is reinforced with a reinforcing member.

2. The battery module according to claim 1, wherein the ratio of the width of the reinforcing member to the length of the non-facing region when the elastic member is viewed in cross-section from a direction perpendicular to the stacking direction of the battery cells is 1.0 or more.

3. The battery module according to claim 1 or 2, wherein the ratio of the width of the reinforcing member to the length of the pouch in the direction perpendicular to the stacking direction of the battery cells is 0.001 or more and 0.05 or less.

4. The battery module according to claim 1 or 2, wherein the ratio of the thickness of the reinforcing member to the thickness of the pouch is 0.03 or more and 0.20 or less.

5. When the elastic member is viewed in cross-section from a direction perpendicular to the stacking direction of the battery cells, the length of the non-facing region is x ０ [mm], the internal pressure of the pouch is y [N / mm] ２ If so, the reinforcing member has a tensile strength of x ０ The battery module according to claim 1 or 2, wherein the ×y [N / mm] is 1 or greater.

6. x ０ The battery module according to claim 5, wherein ×y is 1 N / mm or more and 20 N / mm or less.

7. x ０ The battery module according to claim 5, wherein the diameter is 1.0 mm or more and 4.0 mm or less.

8. The battery module according to claim 1 or 2, wherein the pouch has an internal pressure of 0.1 MPa or more and 3.0 MPa or less.

9. The battery module according to claim 1 or 2, wherein the ratio of the length of the non-facing region in the direction perpendicular to the stacking direction of the battery cells to the length of the pouch in the direction perpendicular to the stacking direction of the battery cells is 0.001 or more and 0.01 or less.

10. The battery module according to claim 1 or 2, wherein the reinforcing member has a tensile strength of 1 N / mm or more.

11. The battery module according to claim 1 or 2, wherein the non-facing region reinforced by the reinforcing member has a tensile strength of 1 N / mm or more and 40 N / mm or less.

12. The battery module according to claim 1 or 2, wherein the reinforcing member includes resin.

13. The battery module according to claim 1 or 2, wherein the elastic member further comprises a first support member that supports at least a portion of the first sealing portion and a second support member that supports at least a portion of the second sealing portion.

14. The battery module according to claim 1 or 2, wherein the elastic member further comprises elastic foam disposed on both sides of the pouch in the stacking direction of the battery cells.

15. The battery module according to claim 1 or 2, wherein the battery cell comprises a negative electrode composite layer containing lithium metal or lithium alloy, a solid electrolyte layer, and a positive electrode composite layer.

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