Manufacturing method of power storage module

Abstract

To provide a manufacturing method of a power storage module having a good sealing property.SOLUTION: A manufacturing method of a power storage module comprising an electrode member 10 and a laminate outer housing body 11 including at least an inside resin layer and a metal layer, comprises, in the following order: an arrangement step of arranging the laminate outer housing body so as to cover the electrode member, and arranging a resin tube 20 between the opposing inside rein layers such that one end is positioned at an inner part of the laminate outer housing body and the other end is positioned at an external part of the laminate outer housing body; an insertion step of inserting a rod-like member 30 in a hollow part of the resin tube; a first sealing step of sealing the electrode member with the laminate outer housing body by thermally deposing both of the inside resin layers and thermally deposing the inside resin layer and the resin tube; a depression step of pulling-off the rod-like member from the resin tube and depressing an inner part of the laminate outer housing body via the hollow part of the resin tube; and a second sealing step of crushing the hollow part of the resin tube to seal the hollow part.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to a method for manufacturing a power storage module.

Background Art

[0002] In a method for manufacturing a power storage module such as a secondary battery, it is known to vacuum-seal an electrode member using a laminated exterior body. For example, in Patent Document 1, a power generation element 5 formed on a substrate 4 for forming a power generation element is laminated together with the substrate 4 with a heat-sealable resin film 2 on the upper surface, and a through-hole 1a that also penetrates the heat-sealable resin film 2 is provided at a portion corresponding to the end of the substrate 4. The power generation element 5 and the substrate 4 are placed on a metal sealing substrate 1, and while one end of each of the positive electrode lead body 3 and the negative electrode lead body 10 is drawn out to the outside, they are covered with a metal foil laminate film 9 having a heat-sealable resin film 9b laminated on the inner surface side. While sucking the gas inside the battery to the outside through the through-hole 1a, the heat-sealable resin film 9b of the heat-sealable laminate film formed by heat-sealing the heat-sealable resin film 2 laminated on the sealing substrate 1 and the metal foil laminate film 9 is heat-sealed to seal portions other than the through-hole 1a. While maintaining a reduced pressure state, a metal sealing plug 11 is inserted into the through-hole 1a, and the sealing plug 11 and the sealing substrate 1 are welded to seal the through-hole 1a. A method for manufacturing a thin-film solid electrolyte battery is disclosed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In Patent Document 1, a through-hole 1a is provided in the metal sealing substrate 1. However, since the metal sealing substrate 1 is used, the volume energy density decreases. On the other hand, as a method of vacuum-sealing the electrode member with a laminated exterior body, for example, a method is assumed in which a metal tube is disposed between the opposing laminated exterior bodies, the pressure is reduced through the metal tube, and then sealed. However, in this method, it is difficult to sufficiently heat-weld the metal tube and the laminated exterior body, and good sealing performance may not be obtained.

[0005] The present disclosure has been made in view of the above circumstances, and a main object thereof is to provide a method for manufacturing a power storage module capable of obtaining a power storage module with good sealing performance.

Means for Solving the Problems

[0006] [1] A method for manufacturing a power storage module including an electrode member and a laminated exterior body that seals the electrode member and has at least an inner resin layer and a metal layer, An arrangement step of arranging the laminated exterior body so as to cover the electrode member, and arranging a resin tube so as to be located between the opposing inner resin layers, with one end located inside the laminated exterior body and the other end located outside the laminated exterior body; An insertion step of inserting a rod-shaped member into the hollow portion of the resin tube; After the insertion step, a first sealing step of sealing the electrode member with the laminated exterior body by thermally welding the inner resin layers to each other and thermally welding the inner resin layer and the resin tube; After the first sealing step, a pressure reduction step of pulling out the rod-shaped member from the resin tube and reducing the pressure inside the laminated exterior body through the hollow portion of the resin tube; After the pressure reduction step, a second sealing step of crushing the hollow portion of the resin tube and sealing the hollow portion; A method for manufacturing a power storage module having the above.

[0007] [2] The method for manufacturing a power storage module according to [1], wherein in the above-described placement step, the resin tube is placed such that one end of the resin tube is located at a corner of the electrode member.

[0008] [3] The method for manufacturing a power storage module further includes a cutting step of cutting the resin tube protruding from the laminate exterior after the second sealing step; a bending step of bending a region where the inner resin layers of the laminate exterior are heat-sealed to each other after the cutting step; The method for manufacturing a power storage module according to [1] or [2], which has

[0009] [4] The laminate exterior has a current collecting portion and a laminate portion disposed around the current collecting portion, In the placement step, the laminate exterior is placed with respect to the electrode member such that one main surface of the electrode member faces the current collecting portion and the other main surface of the electrode member faces the current collecting portion. The method for manufacturing a power storage module according to any one of [1] to [3].

[0010] [5] The resin contained in the inner resin layer and the resin contained in the resin tube are polyolefins. The method for manufacturing a power storage module according to any one of [1] to [4]. [Advantages of the Invention]

[0011] In the present disclosure, there is an effect that a power storage module with good sealing performance can be obtained. [Brief Description of the Drawings]

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0013] Hereinafter, the method for manufacturing a power storage module in the present disclosure will be described in detail with reference to the drawings. Each of the figures shown below is schematically illustrated, and the size and shape of each part are exaggerated as appropriate for easy understanding. Also, in this specification, when expressing the manner of arranging one member with respect to another member, when simply described as "above" or "below", unless otherwise specified, it includes both the case where another member is arranged directly above or directly below so as to be in contact with a certain member, and the case where another member is arranged above or below a certain member via another member.

[0014] The method for manufacturing a power storage module in the present disclosure will be described with reference to FIGS. 1 to 4. First, as shown in FIG. 1, the method for manufacturing a power storage module in the present disclosure includes at least an arrangement process, an insertion process, a first sealing process, a pressure reduction process, and a second sealing process. In FIGS. 2(a) and (b), a pair of laminate exterior bodies 11 are prepared, and an electrode member 10 is housed between the pair of laminate exterior bodies 11.

[0015] FIG. 3 is a schematic plan view illustrating each step in the present disclosure, and is an enlarged view of region X in FIG. 2(b). Further, FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3(a). The laminated exterior body 11 shown in FIG. 4 has an inner resin layer 121, a metal layer 122, and an outer resin layer 123. As shown in FIG. 3(a), the laminated exterior body 11 is arranged so as to cover the electrode member 10. At this time, as shown in FIGS. 3(a) and 4, the resin tube 20 is arranged so as to be located between the opposing inner resin layers 121, and one end t1 is located inside the laminated exterior body 11 and the other end t2 is located outside the laminated exterior body 11 (arrangement step).

[0016] Next, as shown in FIGS. 3(b) and 4, a rod-shaped member 30 is inserted into the hollow portion 21 of the resin tube 20 (insertion step). Next, as shown in FIG. 3(c), for example, using a heat bar 40, the inner resin layers of the laminated exterior body 11 are heat-sealed to each other, and the inner resin layer of the laminated exterior body 11 and the resin tube 20 are heat-sealed. Thereby, the electrode member 10 is sealed with the laminated exterior body 11 (first sealing step). Next, as shown in FIG. 3(d), the rod-shaped member 30 is pulled out from the resin tube 20, and the inside of the laminated exterior body 11 is depressurized through the hollow portion of the resin tube 30 (depressurization step). Next, as shown in FIG. 3(e), for example, using a heat bar 40, the hollow portion of the resin tube 20 is crushed and the hollow portion is sealed (second sealing step). Next, the resin tube 20 protruding from the laminated exterior body 11 is cut (cutting step). Further, if necessary, a bending process described later is performed. Thereby, a power storage module is obtained.

[0017] According to the present disclosure, in the first sealing step, the resin tube and the inner resin layer in the laminated exterior body are heat-sealed, and then, by evacuating the inside of the laminated exterior body through the resin tube, a power storage module with good sealing performance can be obtained. As described above, in Patent Document 1, although the through-hole 1a is provided in the metal sealing substrate 1, since the metal sealing substrate 1 is used, the volume energy density is reduced. In contrast, in the present disclosure, since it is not necessary to use a metal sealing substrate, the volume energy density can be improved.

[0018] Further, as a method of vacuum-sealing the electrode member with the laminated exterior body, for example, a method using a vacuum chamber is assumed. Specifically, the electrode member and the laminated exterior body are arranged in the vacuum chamber, and after evacuation, the laminated exterior bodies are heat-sealed to each other. When using a vacuum chamber, there is a possibility of damaging the electrode member due to an external force (the internal and external pressure difference of the electrode member) being applied to the electrode member during evacuation. In addition, the equipment cost of the vacuum chamber is high, and particularly when manufacturing a large-sized power storage module, the equipment cost of the vacuum chamber becomes large. In contrast, in the present disclosure, a tube is arranged between the opposing laminated exterior bodies, evacuated through the tube, and then sealed. Therefore, there is an advantage that an external force is less likely to be applied to the electrode member during evacuation and the equipment cost is not incurred.

[0019] Further, when a metal tube is used as the above tube, it may be difficult to sufficiently heat-seal the metal tube and the laminated exterior body (inner resin layer). For example, when using a heat bar to heat-seal the laminated exterior bodies (inner resin layers) to each other and at the same time heat-seal the metal tube and the laminated exterior body (inner resin layer), since the heat bar interferes with the metal tube, it may be difficult to sufficiently heat-seal the metal tube and the laminated exterior body (inner resin layer). Therefore, good sealing performance may not be obtained in some cases.

[0020] In contrast, in the present disclosure, by using a resin tube, the resin tube and the laminate exterior (inner resin layer) can be sufficiently heat-welded. For example, when heat-welding the laminate exteriors (inner resin layers) to each other using a heat bar and simultaneously heat-welding the resin tube and the laminate exterior (inner resin layer), even if the heat bar interferes with the resin tube, since the resin tube and the laminate exterior (inner resin layer) are easily compatible, they can be sufficiently heat-welded. Therefore, good sealing performance can be obtained. Further, during heat welding, a rod-shaped member is inserted into the hollow portion of the resin tube. Therefore, it is possible to prevent the hollow portion of the resin tube from being crushed by heat welding. Also, as will be described later, for example, by arranging the resin tube at the corner of the electrode member, there is an advantage that the bending process is easy to perform.

[0021] 1. Arrangement process The arrangement process in the present disclosure is a process of arranging the laminate exterior so as to cover the electrode member, and arranging the resin tube so as to be located between the opposing inner resin layers, and one end is located inside the laminate exterior and the other end is located outside the laminate exterior.

[0022] As shown in FIG. 3(a), in the arrangement process, the laminate exterior 11 is arranged so as to cover the electrode member 10. At this time, as shown in FIGS. 3(a) and 4, the resin tube 20 is arranged so as to be located between the opposing inner resin layers 121, and one end t1 is located inside the laminate exterior 11 and the other end t2 is located outside the laminate exterior 11. "Inside the laminate exterior" means the inside surrounded by the laminate exterior and in which the electrode member is accommodated. Also, as shown in FIG. 3(a), it is preferable to arrange the resin tube 20 so that one end t1 of the resin tube 20 is located at the corner of the electrode member 10. This is because it becomes easier to perform the bending process described later.

[0023] (1) Electrode member The electrode member in the present disclosure usually has an electrode laminate in which a plurality of electrodes are laminated in the thickness direction. The type of the electrode laminate is not particularly limited. The electrode laminate may be an electrode laminate having a liquid electrolyte (electrolyte solution), or may be an electrode laminate having a solid electrolyte (for example, an inorganic solid electrolyte).

[0024] FIG. 5(a) is a schematic plan view illustrating an electrode member in the present disclosure, and FIG. 5(b) is a cross-sectional view taken along line A-A of FIG. 5(a). As shown in FIGS. 5(a) and 5(b), the electrode member 10 has an electrode laminate EL in which a plurality of electrodes E are laminated in the thickness direction D T Further, the electrode member 10 may have a seal member 5 disposed so as to surround the electrode laminate EL.

[0025] As shown in FIG. 5(b), the electrode member 10 has an electrode laminate EL in which a plurality of electrodes E are laminated in the thickness direction D T The electrode laminate EL shown in FIG. 5(b) has, as the electrode E, a bipolar electrode BP, a positive electrode side end electrode CA, and a negative electrode side end electrode AN.

[0026] The bipolar electrode BP has a current collector 1, a positive electrode active material layer 2 disposed on one surface of the current collector 1, and a negative electrode active material layer 3 disposed on the other surface of the current collector 1. The positive electrode side end electrode CA has a current collector 1 and a positive electrode active material layer 2 disposed on one surface of the current collector 1. The negative electrode side end electrode AN has a current collector 1 and a negative electrode active material layer 3 disposed on one surface of the current collector 1. The current collector 1 is, for example, a metal current collector. The positive electrode active material layer 2 contains at least a positive electrode active material, and may further contain a conductive material and a binder. The negative electrode active material layer 3 contains at least a negative electrode active material, and may further contain a conductive material and a binder.

[0027] As shown in FIG. 5(b), the electrode member 10 may have a seal member 5 disposed so as to surround the electrode laminate EL. The seal member 5 contains, for example, a resin. The resin used for the seal member 5 is, for example, a thermoplastic resin. Examples of the thermoplastic resin include polyolefins such as polyethylene and polypropylene.

[0028] As shown in FIG. 5(b), the electrode laminate EL may have a plurality of power generation units U (U T stacked in the thickness direction D 1 , U 2 , U 3 ). The power generation unit is usually a unit having a positive electrode active material layer, a separator, and a negative electrode active material layer. As will be described later, for example, by supplying an electrolytic solution to the power generation unit, it functions as a power storage module. As shown in FIG. 5(b), the plurality of power generation units U (U 1 , U 2 , U 3 ) may be connected in series with each other. Although not particularly shown, the plurality of power generation units may be connected in parallel with each other.

[0029] The shape (planar view shape) of the electrode laminate as viewed from the thickness direction is not particularly limited, and examples thereof include quadrilaterals such as squares and rectangles. For example, the planar view shape of the electrode laminate EL shown in FIGS. 5(a) and 5(b) is a quadrilateral. The length of each side constituting the planar view shape of the electrode laminate is not particularly limited, and each may be, for example, 30 cm or more, 50 cm or more, or even 100 cm or more. On the other hand, the length of each side is, for example, 200 cm or less.

[0030] The method for manufacturing the electrode member is not particularly limited, and for example, the method shown in FIG. 6 can be mentioned. Here, as shown in FIG. 6, each electrode E has a frame body 51 surrounding the current collector 1. The frame body 51 preferably covers a part of one main surface p of the current collector 1, a part of the other main surface q of the current collector 1, and the entire side surface r constituting the outer edge of the current collector 1. In the thickness direction D TBy thermally welding adjacent frame bodies 51, a seal member (for example, seal member 5 in FIG. 5) is formed.

[0031] In FIG. 6, the negative electrode active material layer 3 in the bipolar electrode BP 1 and the positive electrode active material layer 2 in the bipolar electrode BP 2 are opposed to each other with a separator 4 interposed therebetween. At this time, a nesting 6 is disposed between the bipolar electrode BP 1 and the bipolar electrode BP 2 Also, another frame body 51 (spacer 51a) is disposed between the frame body 51 in the bipolar electrode BP 1 and the frame body 51 in the bipolar electrode BP 2

[0032] Next, the positive electrode active material layer 2 in the bipolar electrode BP 1 and the negative electrode active material layer 3 in the negative electrode side end electrode AN are opposed to each other with a separator 4 interposed therebetween. At this time, a nesting 6 is disposed between the bipolar electrode BP 1 and the negative electrode side end electrode AN. Also, another frame body 51 (spacer 51a) is disposed between the frame body 51 in the bipolar electrode BP 1 and the frame body 51 in the negative electrode side end electrode AN.

[0033] Next, the negative electrode active material layer 3 in the bipolar electrode BP 2 and the positive electrode active material layer 2 in the positive electrode side end electrode CA are opposed to each other with a separator 4 interposed therebetween. At this time, a nesting 6 is disposed between the bipolar electrode BP 2 and the positive electrode side end electrode CA. Also, another frame body 51 (spacer 51) is disposed between the frame body 51 in the bipolar electrode BP 2 and the frame body 51 in the positive electrode side end electrode CA. Then, by thermally welding adjacent frame bodies 51 in the thickness direction D T a seal member (for example, seal member 5 in FIG. 5) is formed. Then, although not particularly shown, by pulling out the nesting, a communication hole is formed, an electrolytic solution is injected into the inside of the electrode laminate through the formed communication hole, and after the injection, the communication hole is sealed, whereby an electrode member is obtained.​

[0034] (2) Laminate exterior body The laminate exterior body in the present disclosure is a member that seals the above electrode member. Further, the laminate exterior body has at least an inner resin layer and a metal layer.

[0035] As shown in FIG. 4, the laminate exterior body 11 has at least an inner resin layer 121 and a metal layer 122. The inner resin layer 121 functions as a sealant layer. The inner resin layer 121 preferably contains a thermoplastic resin. Examples of the thermoplastic resin include polyolefins such as polyethylene and polypropylene, polystyrene, and polyvinyl chloride. The thickness of the inner resin layer 121 is not particularly limited, but for example, it is 30 μm or more and 150 μm or less, and may be 40 μm or more and 100 μm or less.

[0036] The metal layer 122 functions as a barrier layer. Examples of the metal used for the metal layer 122 include aluminum, aluminum alloy, and stainless steel. The thickness of the metal layer 122 is not particularly limited, but for example, it is 20 μm or more and 100 μm or less, and may be 30 μm or more and 60 μm or less. Further, as shown in FIG. 4, the laminate exterior body 11 may have an outer resin layer 123 on the side opposite to the inner resin layer 121 with respect to the metal layer 122. The outer resin layer 123 functions as an insulating layer or a protective layer. The outer resin layer 123 preferably contains a thermoplastic resin. Examples of the thermoplastic resin include polyesters such as polyethylene terephthalate (PET) and nylon. The thickness of the outer resin layer 123 is not particularly limited, but for example, it is 20 μm or more and 100 μm or less, and may be 30 μm or more and 60 μm or less.

[0037] In the configuration process, the laminated exterior body is arranged so as to cover the electrode member. As shown in Fig. 2(a), a plurality of laminated exterior bodies 11 may be used to cover the electrode member 10 with respect to one electrode member 10. Although not particularly shown, with respect to one electrode member, one laminated exterior body may be used and the electrode member may be covered with the laminated exterior body by folding one laminated exterior body.

[0038] As shown in Fig. 4, in the laminated exterior body 11, a portion having at least the inner resin layer 121 and the metal layer 122 is referred to as the laminate portion 12. The laminated exterior body 11 has at least the laminate portion 12. On the other hand, as shown in Fig. 2(a), the laminated exterior body 11 may have a current collecting portion 13 in addition to the laminate portion 12. The current collecting portion 13 is a portion in the laminated exterior body 11 that collects current from the electrode member 10. As shown in Fig. 2(a), the laminated exterior body 11 may have the current collecting portion 13 and the laminate portion 12 disposed around the current collecting portion 13. By providing such a current collecting portion 13, it becomes easy to extract a large current. Also, as shown in Fig. 2(a), it is preferable to arrange the laminated exterior body 11 with respect to the electrode member 10 so that one main surface s1 of the electrode member 10 faces the current collecting portion 13. Similarly, it is preferable to arrange the laminated exterior body 11 with respect to the electrode member 10 so that the other main surface s2 of the electrode member 10 faces the current collecting portion 13.

[0039] The laminated exterior body may have a flange portion for heat welding and a recess that is continuously formed from the flange portion and that houses the electrode member. In Fig. 2(a), the laminate portion 12a corresponds to the flange portion, and the laminate portion 12b and the current collecting portion 13 correspond to the recess. Also, as shown in Fig. 3(a), the corners of the flange portion (the laminate portion 12a) may be notched. Thereby, the length of the resin tube 20 covered by the laminated exterior body 11 can be controlled, and it becomes easier to manage the decompression process described later. For example, by adjusting the above-mentioned length of the resin tube 20, it is possible to prevent the hollow portion of the resin tube 20 from being crushed due to a pressure difference during decompression.

[0040] (3) Resin tube The resin tube in the present disclosure has a hollow portion. The resin contained in the resin tube is not particularly limited as long as it can be heat-sealed to the inner resin layer in the laminate exterior.

[0041] The resin contained in the resin tube is preferably a thermoplastic resin. Examples of the thermoplastic resin include polyolefins such as polyethylene and polypropylene, polystyrene, and polyvinyl chloride. In the present disclosure, it is preferable that the resin contained in the inner resin layer and the resin contained in the resin tube are polyolefins. This is because good sealing properties can be obtained. The resin contained in the inner resin layer and the resin contained in the resin tube may both be polyethylene or both be polypropylene.

[0042] The outer diameter of the resin tube is not particularly limited, but for example, it is 5 mm or more and 10 mm or less, and may be 6 mm or more and 8 mm or less. The inner diameter (diameter of the hollow portion) of the resin tube is not particularly limited, but for example, it is 3 mm or more and 5 mm or less.

[0043] 2. Insertion step The insertion step in the present disclosure is a step of inserting a rod-shaped member into the hollow portion of the resin tube. The insertion step may be performed after the above-described arrangement step or before the above-described arrangement step. In the latter case, the laminate exterior is arranged so as to cover the electrode member, and the resin tube into which the rod-shaped member has been inserted in advance is arranged between the opposing inner resin layers.

[0044] As shown in FIG. 3(b), in the insertion step, a rod-shaped member 30 is inserted into the hollow portion of the resin tube 20. The material of the rod-shaped member 30 is preferably a material that is difficult to heat-seal with the resin tube. Examples of the material of the rod-shaped member 30 include metals. Further, a release agent for improving the releasability from the resin tube may be applied to the surface of the rod-shaped member 30.

[0045] 3. First sealing step In the first sealing step in the present disclosure, after the above-described insertion step, the inner resin layers are heat-sealed to each other, and the inner resin layer and the resin tube are heat-sealed, thereby sealing the electrode member with the laminate exterior body. By the first sealing step, usually, the entire electrode member is sealed with the laminate exterior body except for the hollow portion of the resin tube.

[0046] As shown in FIG. 3(c), in the first sealing step, for example, by pressing the heat bar 40, the inner resin layers of the laminate exterior body 11 are heat-sealed to each other, and the inner resin layer of the laminate exterior body 11 and the resin tube 20 are heat-sealed. Further, as shown in FIG. 3(c), usually, in a region of the laminate exterior body 11 located outside the electrode member 10 in a plan view, the inner resin layers of the laminate exterior body 11 are heat-sealed to each other. At the same time, the inner resin layer of the laminate exterior body 11 and the resin tube 20 are heat-sealed. Examples of the heat-sealing method include a method of pressing a heating body against the laminate exterior body from the surface side of the laminate exterior body located on the side opposite to the inner resin layer with reference to the metal layer. Further, the heat-sealing conditions are not particularly limited and are appropriately adjusted to such an extent that the desired sealing property is obtained.

[0047] 4. Decompression Step In the decompression step in the present disclosure, after the above-described first sealing step, the rod-shaped member is pulled out from the resin tube, and the inside of the laminate exterior body is decompressed through the hollow portion of the resin tube.

[0048] As shown in FIGS. 3(c) and (d), in the decompression step, the rod-shaped member 30 is pulled out from the resin tube 20, and the inside of the laminate exterior body 11 is decompressed through the hollow portion of the resin tube 20. The method of decompressing the inside of the laminate exterior body is not particularly limited, and a known decompression device such as a vacuum pump may be used. Further, the internal pressure of the laminate exterior body after decompression is not particularly limited, but for example, it is 5 kPa or more and 100 kPa or less, and may be 10 kPa or more and 50 kPa or less.

[0049] 5. Second Sealing Step In the second sealing step in the present disclosure, after the above-described decompression step, the hollow portion of the resin tube is crushed and the hollow portion is sealed. By sealing the hollow portion, the inside of the laminate exterior body is maintained in a decompressed state.

[0050] As shown in FIG. 3(e), in the second sealing step, for example, by pressing the heat bar 40 against the resin tube 20 through the laminate exterior body 11, the inner walls of the hollow portion of the resin tube 20 are heat-welded to each other, and the hollow portion is crushed. Thereby, the hollow portion is sealed. Although not particularly shown, the hollow portion of the resin tube may be crushed by injecting molten resin into the hollow portion. Further, for example, a clip may be used to physically crush the hollow portion.

[0051] 6. Cutting step The method for manufacturing a power storage module in the present disclosure may have a cutting step of cutting the resin tube protruding from the laminate exterior body after the second sealing step. By performing the cutting step, for example, it becomes easier to perform a bending process described later. Further, if the resin tube protrudes from the laminate exterior body, when, for example, vibration is applied to the protruding portion, the sealing property in the vicinity of the resin tube may decrease. However, by performing the cutting step, it is possible to suppress a decrease in the sealing property in the vicinity of the resin tube.

[0052] As shown in FIG. 3(f), in the cutting step, it is preferable to cut the resin tube 20 along the outer edge of the laminate exterior body 11. Although not particularly shown, both the laminate exterior body and the resin tube may be cut inside the outer edge of the laminate exterior body. By cutting both the laminate exterior body and the resin tube, the laminate exterior body and the resin tube are flush with each other at the cut surface, so that, for example, it becomes easier to perform a bending process described later.

[0053] 7. Bending process The manufacturing method of the power storage module in the present disclosure may include a bending process of bending a region where the inner resin layers of the laminate exterior are heat-welded to each other. By performing the bending process, it is possible to increase the area of the region that can be heat-welded while suppressing a decrease in volume efficiency, and further improve the sealing performance of the laminate exterior. The bending process is performed after the second sealing process described above. For example, when the cutting process described above is performed, the bending process is usually performed after the cutting process. Further, the bending process is preferably performed on a region including the resin tube remaining on the laminate exterior side.

[0054] As described above, in the placement process, when the resin tube is placed such that one end of the resin tube is located at the corner of the electrode member, it is particularly preferable to perform the bending process. In the region of the laminate exterior where the resin tube remains, an increase in thickness due to the resin tube occurs, making it difficult to perform the bending process. In particular, the longer the region to be bent, the greater the influence of wrinkles when wrinkles are generated by the second sealing process. On the other hand, by placing the resin tube at the corner of the electrode member, the region to be bent becomes shorter, so even when wrinkles are generated by the second sealing process, its control and management become easier.

[0055] In the bending process, it is preferable to fold the laminate exterior. In the first folding, the laminate exterior is folded so that one surface of the laminate exterior faces each other. In the folding after the second time, the laminate exterior is folded so that one surface of the laminate exterior and the other surface of the laminate exterior face each other. In the bending process, the laminate exterior may be folded once or folded two or more times.

[0056] 8. Power Storage Module Specific examples of the power storage module obtained through the above-described respective processes include secondary batteries (e.g., lithium-ion secondary batteries) and electric double layer capacitors. Further, examples of the uses of the power storage module include power sources for vehicles such as hybrid vehicles (HEV), plug-in hybrid vehicles (PHEV), battery electric vehicles (BEV), gasoline vehicles, and diesel vehicles. In particular, it is preferably used as a driving power source for hybrid vehicles (HEV), plug-in hybrid vehicles (PHEV), or battery electric vehicles (BEV). Further, the power storage module may be used as a power source for moving bodies other than vehicles (e.g., railways, ships, aircraft), and may also be used as a power source for electric products such as information processing devices.

[0057] The present disclosure is not limited to the above-described embodiments. The above-described embodiments are examples, and any configuration that has a configuration substantially the same as the technical idea described in the claims of the present disclosure and exhibits the same operational effects is included in the technical scope of the present disclosure.

Explanation of Reference Numerals

[0058] 1... Current collector 2... Positive electrode active material layer 3... Negative electrode active material layer 4... Separator 5... Sealing member 6... Nest 10... Electrode member 11... Laminate exterior body 12... Laminated portion 13... Current collecting portion

Claims

1. A method for manufacturing an electricity storage module including an electrode member and a laminate exterior body that seals the electrode member and has at least an inner resin layer and a metal layer, comprising: a positioning step of positioning the resin tube between the opposing inner resin layers while positioning the laminate exterior body so as to cover the electrode member, and such that one end of the resin tube is positioned inside the laminate exterior body and the other end of the resin tube is positioned outside the laminate exterior body; an inserting step of inserting a rod-shaped member into a hollow portion of the resin tube; a first sealing step of sealing the electrode member with the laminate exterior body by heat-welding the inner resin layers to each other and heat-welding the inner resin layers and the resin tube after the inserting step; a decompression step of pulling out the rod-shaped member from the resin tube after the first sealing step, and decompressing the inside of the laminate exterior body through the hollow portion of the resin tube; a second sealing step of squashing the hollow portion of the resin tube and sealing the hollow portion after the depressurization step; A method for manufacturing an electricity storage module comprising the steps of:

2. The method for manufacturing an electric storage module according to claim 1 , wherein in the arranging step, the resin tube is arranged such that the one end of the resin tube is located at a corner of the electrode member.

3. The method for manufacturing the electricity storage module further includes: a cutting step of cutting the resin tube protruding from the laminate exterior body after the second sealing step; a folding process step of folding the region where the inner resin layers of the laminate exterior body are thermally welded to each other after the cutting process; The method for manufacturing the electric storage module according to claim 2 , further comprising:

4. The laminate exterior body has a current collecting portion and a laminate portion arranged around the current collecting portion, 2. The method for manufacturing a storage module according to claim 1, wherein in the arrangement step, the laminate exterior body is arranged on the electrode member such that one main surface of the electrode member faces the current collecting portion and the other main surface of the electrode member faces the current collecting portion.

5. The method for producing an electricity storage module according to claim 1 , wherein a resin contained in the inner resin layer and a resin contained in the resin tube are polyolefins.

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