Manufacturing method of power storage module

Abstract

To provide a manufacturing method for a power storage module that can prevent a voltage detection terminal from tilting toward a center portion side of an electrode stack in a stacking direction.SOLUTION: A manufacturing method of a power storage module 100 includes the steps of: bonding a seal member 21 to a peripheral portion 15c of a current collector 15 of each of a plurality of electrodes (11 to 13) such that a voltage detection terminal 30 is drawn out from the plurality of seal members 21; stacking the plurality of electrodes (11 to 13) in a Z direction (stacking direction) to form an electrode stack 10; heat-welding the seal members 21 stacked in the Z direction to each other; and adjusting temperatures of the plurality of seal members 21 after the seal members 21 have been heat-welded to each other. The adjusting step includes a step of cooling the seal member 21 corresponding to a center portion 10b of the electrode stack 10 in the Z direction relatively more than the seal member 21 corresponding to an end portion 10a of the electrode stack 10 in the Z direction.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present disclosure relates to a method for manufacturing an energy storage module. [Background technology]

[0002] JP 2021-022534 A (Patent Document 1) discloses a method for manufacturing an electricity storage module including a plurality of electrodes. The plurality of electrodes are stacked in a stacking direction. A primary seal is bonded to the peripheral edge of each current collector of the plurality of electrodes. The primary seals stacked in the stacking direction are welded to each other. The portions of the primary seals that are melted by heat are deformed and joined (welded) to adjacent primary seals in the stacking direction. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-022534 Summary of the Invention [Problem to be solved by the invention]

[0004] Although not specified in the above Patent Document 1, a voltage detection terminal may be electrically connected to the multiple electrodes. After the primary seal is melted, heat is dissipated so that the temperature of the primary seal becomes equal to or lower than the melting point of the primary seal, causing the primary seal to deform (solidify) into a solid. This causes adjacent primary seals to be welded together. At this time, the primary seal corresponding to the electrode at the end side in the stacking direction may dissipate heat and solidify more quickly than the primary seal corresponding to the electrode at the center in the stacking direction.

[0005] In this case, it is believed that the primary seal at the end part solidifies first, even though the primary seal at the center part is still in a molten state. As a result, the primary seal at the end part shrinks toward the center part as it solidifies. This causes stress to be applied to the primary seal at the end part toward the center part. In this case, it is believed that the voltage detection terminal provided at the end part will tilt toward the center part.

[0006] The present disclosure has been made to solve the above-mentioned problems, and its purpose is to provide a manufacturing method for an energy storage module that is capable of preventing a voltage detection terminal from tilting toward the center of the electrode stack in the stacking direction. [Means for solving the problem]

[0007] A method for manufacturing an electricity storage module according to one aspect of the present disclosure is a method for manufacturing an electricity storage module including a plurality of electrodes, each of which is electrically connected to a voltage detection terminal and includes a current collector, and includes the steps of: bonding a seal member to a peripheral portion of each current collector of the plurality of electrodes so that the voltage detection terminal is exposed; stacking the plurality of electrodes in a stacking direction to form an electrode stack; heat-welding the seal members stacked in the stacking direction by stacking the plurality of electrodes; and adjusting the temperature of the seal members after the seal members have been heat-welded. The adjusting step includes a first step of cooling the seal member corresponding to a central portion of the electrode stack in the stacking direction relatively more than the seal members corresponding to the ends of the electrode stack in the stacking direction, or a second step of immersing at least the seal member corresponding to the central portion in a cooling liquid.

[0008] In the method for manufacturing an electric storage module according to one aspect of the present disclosure, as described above, the adjusting step includes a first step of cooling the seal member corresponding to the center of the electrode stack in the stacking direction relatively more than the seal member corresponding to the end of the electrode stack in the stacking direction, or a second step of immersing at least the seal member corresponding to the center in a cooling liquid. The first step can reduce the difference between the amount of heat released from the seal member corresponding to the center and the amount of heat released from the seal member corresponding to the end. As a result, the difference between the timing at which the seal member corresponding to the end solidifies and the timing at which the seal member corresponding to the center solidifies can be reduced. This can prevent the voltage detection terminal from tilting toward the center of the electrode stack in the stacking direction. In addition, the second step can quickly cool the seal member corresponding to the center with the cooling liquid. As a result, the seal member corresponding to the center can be quickly solidified. This can prevent the voltage detection terminal from tilting toward the center of the electrode stack in the stacking direction.

[0009] In the method for manufacturing an electric storage module according to the above aspect, the first step is preferably a step of locally cooling the sealing member corresponding to the central portion. With this configuration, it is possible to increase the amount of heat dissipation from the sealing member corresponding to the central portion while suppressing an increase in the amount of heat dissipation from the sealing member corresponding to the end portion.

[0010] In this case, the first step is preferably a step of locally blowing cool air toward the sealing member corresponding to the central portion. With this configuration, the amount of heat dissipation from the sealing member corresponding to the central portion can be easily increased without wetting the electrode laminate.

[0011] In the method for manufacturing an electric storage module according to the above aspect, the second step is preferably a step of immersing the seal member corresponding to the center portion together with the seal members corresponding to the ends in the cooling liquid. With this configuration, both the seal member corresponding to the center portion and the seal members corresponding to the ends can be quickly cooled by the cooling liquid. As a result, the seal member corresponding to the center portion and the seal members corresponding to the ends can be uniformly cooled.

[0012] In the method for manufacturing an electric storage module according to the above aspect, the first step is preferably a step of heating at least the sealing members corresponding to the end portions in a state in which the heating temperature of the sealing member corresponding to the center portion is set lower than the heating temperature of the sealing members corresponding to the end portions. With this configuration, the sealing member corresponding to the center portion can be cooled relatively more than the sealing members corresponding to the end portions without using a cooling device. Effect of the Invention

[0013] According to the present disclosure, it is possible to prevent the voltage detection terminal from tilting towards the center of the electrode stack in the stacking direction. [Brief description of the drawings]

[0014] [Figure 1] 1 is a cross-sectional view showing a configuration of an electricity storage device according to an embodiment. [Diagram 2] 1 is a cross-sectional view showing a configuration of an electricity storage module according to one embodiment. [Diagram 3] Fig. 3(A) is a diagram showing a change in state of a seal during heat dissipation according to a comparative example, and Fig. 3(B) is a diagram showing a change in state of a seal during heat dissipation according to an embodiment. [Figure 4] FIG. 4 is a flow diagram showing a method for manufacturing an electricity storage module according to an embodiment. [Diagram 5] FIG. 5 is a diagram showing a specific example of step S5 in FIG. [Figure 6] FIG. 6 is a diagram showing a modification of FIG. 5. [Figure 7]FIG. 11 is a flow diagram showing a method for manufacturing an electricity storage module according to a first modified example of an embodiment. [Figure 8] FIG. 8 is a diagram showing a specific example of step S15 in FIG. 7. [Figure 9] FIG. 11 is a flow chart showing a method for manufacturing an electricity storage module according to a second modified example of an embodiment. [Figure 10] FIG. 10 is a diagram showing a specific example of step S25 in FIG. [Figure 11] FIG. 11 is a diagram showing a modification of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference characters and the description thereof will not be repeated.

[0016] (Configuration of the Power Storage Device) Fig. 1 is a diagram showing the configuration of an energy storage device 100a including an energy storage module 100 manufactured by the manufacturing method for an energy storage module according to this embodiment. The energy storage device 100a shown in Fig. 1 is used as a battery for various vehicles such as a forklift, a hybrid vehicle, and an electric vehicle. Note that the energy storage device 100a may also be used for things other than vehicles.

[0017] The energy storage device 100a includes a module stack 1 and a restraining unit 2. The energy storage module 100 is, for example, a bipolar battery, and has a substantially rectangular shape when viewed along the Z direction. The energy storage module 100 is, for example, a secondary battery such as a nickel-metal hydride secondary battery or a lithium-ion secondary battery, or an electric double layer capacitor. The restraining unit 2 is a device that applies a restraining load in the Z direction to the module stack 1. The Z direction is an example of the "stacking direction" in this disclosure.

[0018] The module stack 1 includes a plurality of (three in this embodiment) energy storage modules 100 and a plurality of (four in this embodiment) conductive structures 3. The energy storage modules 100 and the conductive structures 3 are alternately stacked in the Z direction. The energy storage modules 100 adjacent to each other in the Z direction are electrically connected by the conductive structures 3. In the example shown in FIG. 1, the conductive structures 3 are also arranged outside (Z1 side, Z2 side) the energy storage modules 100 located at both ends in the Z direction, but this is not limited thereto.

[0019] A negative electrode terminal 4 is connected to the conductive structure 3 that is disposed closest to the Z1 side among the plurality of conductive structures 3. A positive electrode terminal 5 is connected to the conductive structure 3 that is disposed closest to the Z2 side among the plurality of conductive structures 3. Each of the negative electrode terminal 4 and the positive electrode terminal 5 extends, for example, in the planar direction. Providing such a negative electrode terminal 4 and a positive electrode terminal 5 enables charging and discharging of the electricity storage device 100a.

[0020] The conductive structure 3 releases heat generated in the power storage module 100. A plurality of flow paths 3a for circulating a coolant such as air are provided inside the conductive structure 3. The flow paths 3a extend in a direction perpendicular to the plane of the paper in Fig. 1. When the coolant such as air passes through the flow paths 3a, the heat generated in the power storage module 100 is efficiently released to the outside.

[0021] The restraint portion 2 has a pair of end plates 2a, a fastening bolt 2b, and a nut 2c. The pair of end plates 2a sandwich the module stack 1 in the Z direction. The pair of end plates 2a are fastened (fixed) to each other by the fastening bolt 2b and the nut 2c.

[0022] An insulating film 6 having electrical insulation properties is provided on the surface of each of the pair of end plates 2a facing the module stack 1. The insulating film 6 provides insulation between each of the pair of end plates 2a and the conductive structure 3.

[0023] 2 is a cross-sectional view showing a detailed configuration of the electricity storage module 100. The electricity storage module 100 includes an electrode stack 10 and a seal 20.

[0024] The electrode laminate 10 has a bipolar electrode 11, a negative terminal electrode 12, a positive terminal electrode 13, and a separator 14. In the electrode laminate 10, the positive terminal electrode 13, the multiple bipolar electrodes 11, and the negative terminal electrode 12 are laminated in this order from the Z2 side. The separators 14 are provided between the positive terminal electrode 13 and the bipolar electrode 11, between the bipolar electrodes 11, and between the negative terminal electrode 12 and the bipolar electrode 11. Each of the bipolar electrode 11, the negative terminal electrode 12, and the positive terminal electrode 13 is an example of an "electrode" in this disclosure.

[0025] A plurality of voltage detection terminals 30 are connected to the electrode stack 10. The voltage detection terminals 30 are electrically connected to a plurality of electrodes (11-13) of the electrode stack 10. For example, the voltage detection terminals 30 are electrically connected to the plurality of electrodes by coming into contact with a current collector 15 described below.

[0026] The voltage detection terminal 30 is connected to the end portion 10a on each of the Z1 side and the Z2 side of the electrode laminate 10 and to the center portion 10b in the Z direction of the electrode laminate 10. In the example shown in Fig. 2, the voltage detection terminal 30 is connected to each of the bipolar electrode 11, the negative terminal electrode 12, and the positive terminal electrode 13, but the connection position of the voltage detection terminal 30 is not limited to this example.

[0027] The bipolar electrode 11 is composed of a current collector 15, a positive electrode 16 (positive electrode active material layer), and a negative electrode 17 (negative electrode active material layer). In the bipolar electrode 11, the positive electrode 16 is in contact with a surface 15a of the current collector 15 on the Z1 side. In the bipolar electrode 11, the negative electrode 17 is in contact with a surface 15b of the current collector 15 on the Z2 side.

[0028] The negative terminal electrode 12 is composed of a current collector 15 and a negative electrode 17. In the negative terminal electrode 12, the negative electrode 17 is in contact with a surface 15b of the current collector 15 on the Z2 side. The positive terminal electrode 13 is composed of a current collector 15 and a positive electrode 16. In the positive terminal electrode 13, the positive electrode 16 is in contact with a surface 15a of the current collector 15 on the Z1 side. In this embodiment, the formation area of ​​the negative electrode 17 on the surface 15b of the current collector 15 is slightly larger than the formation area of ​​the positive electrode 16 on the surface 15a of the current collector 15.

[0029] Current collector 15 is a flexible conductor having a plate shape extending in the planar direction. Current collector 15 is, for example, a nickel foil, a plated steel plate, or a plated stainless steel plate.

[0030] The separator 14 is a member for isolating the positive electrode 16 and the negative electrode 17, and is disposed between the positive electrode 16 and the negative electrode 17. The separator 14 has, for example, a sheet shape. The separator 14 is, for example, a porous film made of a polyolefin resin such as polyethylene (PE) or polypropylene (PP). The separator 14 may be a woven or nonwoven fabric made of polypropylene, methyl cellulose, or the like. The separator 14 may be reinforced with a vinylidene fluoride resin compound. The separator 14 is not limited to a sheet shape, and may be a bag shape.

[0031] The seal 20 is a resin member configured to surround the electrode stack 10. The seal 20 is formed by welding a plurality of seal members 21 together. Each of the plurality of seal members 21 is provided so as to surround the peripheral portion 15c of the current collector 15. The plurality of seal members 21 (seals 20) are formed into a rectangular frame shape, for example, from an insulating resin. Examples of resins constituting the seal members 21 include polypropylene (PP), polyphenylene sulfide (PPS), and modified polyphenylene ether (modified PPE).

[0032] Each of the voltage detection terminals 30 is provided so as to be drawn out from the sealing members 21 (seals 20). That is, the sealing members 21 are provided so that the voltage detection terminals 30 are exposed.

[0033] The seal member 21 is continuously welded (bonded) over the entire circumference of the peripheral portion 15c of the current collector 15 by, for example, ultrasonic waves or heat.

[0034] The multiple seal members 21 are stacked in the Z direction by stacking the multiple electrodes (11 to 13) in the Z direction. The seal members 21 adjacent to each other in the Z direction are welded (heat welded) to each other.

[0035] Here, FIG. 3(A) is a diagram showing a conventional method for manufacturing a power storage module (comparative example). In this example, after the sealing members 21 are melted to weld the sealing members 21 together, the sealing members 21 are heat-dissipated so that the temperature of each sealing member 21 becomes equal to or lower than the melting point of the sealing members 21. At this time, the amount of heat dissipated from the sealing member 21 at the end 10a (see FIG. 2) in the Z direction is greater than the amount of heat dissipated from the sealing member 21 at the center 10b (see FIG. 2) in the Z direction. This is due to the fact that the electrode stack 10 is sandwiched and restrained by a pair of restraining members (not shown) in the Z direction when the sealing members 21 are welded. In this case, it is considered that the primary seal at the end 10a side solidifies first, even though the sealing member 21 at the center 10b is still in a molten state (see the central diagram in FIG. 3(A)). For this reason, the sealing member 21 at the end 10a side shrinks toward the center 10b side when solidifying. Due to this, the sealing member 21 at the end 10a side is subjected to stress toward the center 10b side. In this case, it is conceivable that the voltage detection terminal 30 provided on the end portion 10a side will be inclined toward the central portion 10b (see the rightmost diagram in FIG. 3(A)).

[0036] Therefore, in this embodiment, as shown in Fig. 3(B), the amount of heat released from each of the molten seal members 21 is made uniform, thereby aiming to align the timing at which each of the seal members 21 solidifies. This makes it possible to prevent the voltage detection terminal 30 from tilting toward the central portion 10b.

[0037] (Method of manufacturing energy storage module) A method for manufacturing the electricity storage module 100 according to this embodiment will be described with reference to FIGS.

[0038] In step S1, a process of preparing a plurality of electrodes is performed. That is, each of a bipolar electrode 11, a negative terminal electrode 12, and a positive terminal electrode 13 is prepared. The preparing process refers to a process of forming the electrodes (11 to 13) by stacking a current collector 15 and at least one of a positive electrode 16 and a negative electrode 17.

[0039] In step S2, the seal member 21 is joined to the peripheral portion 15c of the current collector 15 of each of the multiple electrodes (11-13). At this time, the seal member 21 is joined to the peripheral portion 15c so that the voltage detection terminal 30 is exposed. That is, the voltage detection terminal 30 is pulled out from the seal member 21. For example, the thickness of the seal member 21 (the width in the left-right direction in FIG. 2) may be adjusted so that the voltage detection terminal 30 is not buried in the seal member 21 (so that the voltage detection terminal 30 is exposed).

[0040] In step S3, a plurality of electrodes (11-13) are laminated in the Z direction to form an electrode laminate 10. As a result, a plurality of sealing members 21 are laminated (arranged) in the Z direction. At this point, the sealing members 21 may be in contact with each other or may be spaced apart from each other.

[0041] In step S4, the sealing members 21 laminated in step S3 are welded together by heating. Specifically, with the electrode stack 10 fixed in the Z direction, the end faces 21a (see FIG. 2) of each sealing member 21 are heated by an infrared heater or the like. The end faces 21a are the outer surfaces of the sealing members 21 (the surfaces that are visible when the sealing members 21 are viewed from the opposite side to the electrode stack 10). As a result, the end faces 21a and the peripheries of the end faces 21a melt and deform. Then, the end faces 21a of adjacent sealing members 21 are temporarily joined together to form an end face welding layer. At this time, the multiple electrodes (11 to 13) are also temporarily fixed.

[0042] In step S5, the temperatures (amount of heat dissipation) of the multiple seal members 21 (end faces 21a) are adjusted so that the temperatures of the multiple seal members 21 (end faces 21a) welded together in step S4 are uniformly lowered (to the melting point of the seal members 21). This suppresses temperature variation between the multiple seal members 21 (end faces 21a). Step S5 is an example of the "first step" of the present disclosure.

[0043] Here, in step S5, the seal member 21 corresponding to the central portion 10b of the electrode stack 10 in the Z direction is cooled relatively more than the seal member 21 corresponding to the end portion 10a of the electrode stack 10 in the Z direction. This makes it possible to reduce the difference between the amount of heat dissipation of the seal member 21 corresponding to the end portion 10a and the amount of heat dissipation of the seal member 21 corresponding to the central portion 10b.

[0044] Specifically, as shown in Fig. 5, the seal member 21 corresponding to the central portion 10b is locally cooled. In particular, cool air is locally blown from the blower 200 toward the seal member 21 corresponding to the central portion 10b. At this time, a wind shield or the like may be provided so that the cool air does not hit the seal member 21 corresponding to the end portion 10a.

[0045] As shown in Fig. 5, cool air may be blown only near the voltage detection terminal 30 provided in the central portion 10b. Alternatively, as shown in Fig. 6, cool air may be blown all over (all around) the sealing member 21 corresponding to the central portion 10b by a blower 210 provided to surround the power storage module 100.

[0046] As described above, in this embodiment, a process is performed in which the seal member 21 corresponding to the center portion 10b of the electrode laminate 10 in the Z direction is cooled relatively more than the seal member 21 corresponding to the end portion 10a of the electrode laminate 10 in the Z direction. This allows the increase in the amount of heat dissipated from the seal member 21 in the center portion 10b to be relatively large. As a result, even if the amount of heat dissipated in the end portion 10a is larger than the amount of heat dissipated in the center portion 10b in a normal state (a state in which heat is naturally dissipated), the amount of heat dissipated in the center portion 10b and the amount of heat dissipated in the end portion 10a can be made uniform. This allows the timing at which the seal member 21 solidifies in the end portion 10a side and in the center portion 10b to be aligned, thereby preventing the voltage detection terminal 30 from tilting toward the center portion 10b (and toward the end portion 10a).

[0047] Furthermore, since shrinkage (deformation) of the seal 20 can be suppressed, the injection port for the electrolyte formed in the seal 20 can be suppressed from being deformed.

[0048] In addition, in this embodiment, a process is performed in which cool air is locally blown toward the seal member 21 corresponding to the central portion 10b of the electrode stack 10. This makes it possible to adjust only the amount of heat dissipation from the seal member 21 corresponding to the central portion 10b while suppressing the influence on the seal member 21 corresponding to the end portion 10a. As a result, the amount of heat dissipation from the end portion 10a and the amount of heat dissipation from the central portion 10b can be easily made uniform.

[0049] In the above embodiment, an example was shown in which a step of locally blowing cold air toward the sealing member 21 corresponding to the central portion 10b of the electrode stack 10 was performed, but the present disclosure is not limited to this. Steps other than the above may also be performed.

[0050] Fig. 7 is a diagram showing a first modified example of Fig. 4 of the above embodiment. In the example shown in Fig. 7, step S15 is performed instead of step S5 of the above embodiment. In step S15, a step of immersing the power storage module 100 in the coolant 300 is performed. In this step, the seal member 21 corresponding to the central portion 10b of the electrode stack 10 is immersed in the coolant 300 together with the seal member 21 corresponding to the end portion 10a of the electrode stack 10. Note that step S15 is an example of the "second step" of the present disclosure.

[0051] Specifically, as shown in Fig. 8, the entire power storage module 100 is immersed in the coolant 300 filled in the container 310. As a result, the seal members 21 for the central portion 10b and the seal members 21 for the end portions 10a are uniformly cooled (quenched) by the cooling water. As a result, the amount of heat dissipated from the seal members 21 for the central portion 10b and the amount of heat dissipated from the seal members 21 for the end portions 10a can be made uniform. As a result, the molten seal members 21 are solidified uniformly, so that tilting of the voltage detection terminals 30 can be suppressed.

[0052] 8 shows an example in which both the seal member 21 for the central portion 10b and the seal member 21 for the end portion 10a are immersed in the coolant 300, but the present disclosure is not limited to this. The seal member 21 for the end portion 10a may not be immersed in the coolant, but the seal member 21 for the central portion 10b may be immersed in the coolant.

[0053] Fig. 9 is a diagram showing a second modified example of Fig. 4 of the above embodiment. In the example shown in Fig. 9, step S25 is performed instead of step S5 of the above embodiment. In step S25, a step of heating the seal member 21 is performed. At this time, the heating temperature of the seal member 21 corresponding to the central portion 10b is set lower than the heating temperature of the seal member 21 corresponding to the end portion 10a. Note that step S25 is an example of the "first step" of the present disclosure.

[0054] Specifically, as shown in FIG. 10, the seal member 21 is heated by a heating unit 400 (an infrared heater or a hot air blower). The heating unit 400 includes a central portion 410 and a pair of end portions 420. The heating capacity of the central portion 410 is lower than that of the end portions 420. The seal member 21 corresponding to the central portion 10b is heated by the central portion 410, and the seal member 21 corresponding to the end portion 10a is heated by the end portions 420. As a result, the seal member 21 corresponding to the end portion 10a is heated relatively more than the seal member 21 corresponding to the central portion 10b. In other words, the seal member 21 corresponding to the central portion 10b is cooled relatively more than the seal member 21 corresponding to the end portion 10a.

[0055] 11, the seal member 21 may be heated by two heating units 500 (infrared heaters or hot air blowers). In this case, the heating units 500 are arranged to face the seal members 21 corresponding to both end portions 10a of the electrode stack 10. As a result, the seal member 21 corresponding to the central portion 10b is not heated, but the seal member 21 corresponding to both end portions 10a is heated. At this time, heat is naturally released from the seal member 21 corresponding to the central portion 10b.

[0056] In the above embodiment, an example has been shown in which cold air is locally applied to the seal member 21 corresponding to the central portion 10b of the electrode stack 10, but the present disclosure is not limited to this. For example, a circulation pipe through which a cooling liquid flows may be arranged so as to be in contact with the seal member 21 corresponding to the central portion 10b, without being in contact with the seal member 21 corresponding to the end portion 10a.

[0057] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present disclosure is defined by the claims, not by the description of the embodiments described above, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0058] 10 electrode laminate, 10a end, 10b central portion, 11 bipolar electrode (electrode), 12 negative terminal electrode (electrode), 13 positive terminal electrode (electrode), 15 current collector, 15c peripheral portion, 21 sealing member, 30 voltage detection terminal, 100 energy storage module, Z direction (stacking direction).

Claims

1. A method for manufacturing an electricity storage module including a plurality of electrodes each including a current collector and electrically connected to a voltage detection terminal, comprising: bonding a seal member to a peripheral portion of the current collector of each of the plurality of electrodes so that the voltage detection terminal is exposed; forming an electrode stack by stacking the plurality of electrodes in a stacking direction; a step of heat-welding the sealing members stacked in the stacking direction by stacking the plurality of electrodes; and adjusting the temperature of the sealing members after the sealing members are heat-welded to each other. The adjusting step includes: a first step of cooling the sealing member corresponding to a central portion of the electrode stack in the stacking direction relatively more than the sealing member corresponding to an end portion of the electrode stack in the stacking direction; or A method for manufacturing an electric storage module, comprising: a second step of immersing at least the sealing member corresponding to the central portion in a coolant.

2. The method for manufacturing an electric storage module according to claim 1 , wherein the first step is a step of locally cooling the sealing member corresponding to the central portion.

3. The method for manufacturing an electric storage module according to claim 2 , wherein the first step is a step of locally blowing cool air toward the sealing member corresponding to the central portion.

4. The method for manufacturing an electric storage module according to claim 1 , wherein the second step is a step of immersing the sealing member corresponding to the central portion together with the sealing members corresponding to the end portions in the cooling liquid.

5. 2. The method for manufacturing an energy storage module according to claim 1, wherein the first step is a step of heating at least the sealing member corresponding to the end portion in a state in which the heating temperature of the sealing member corresponding to the central portion is set lower than the heating temperature of the sealing member corresponding to the end portion.

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