JP2014053152A - Power storage module and power storage module manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage module and a manufacturing method for the power storage module capable of sealing insertion openings in a plurality of cases at the same time the cases are constructed as an integral body, and also capable of improving productivity.SOLUTION: A power storage module 10 is constituted such that a plurality of cases 20 individually accommodating an electrode assembly 11 are juxtaposed in a state that an insertion opening 20a and a bottom wall 22 are alternately positioned. The insertion opening 20a is blocked by a bottom wall 22 or a lid member 13 of another case 20 adjacent in the juxtaposed direction, and the plurality of cases 20 are sandwiched in the juxtaposed direction by end plates 43, a through-bolt 44, and a nut 45. The insertion opening 20a is surrounded by a sealing member 42, the sealing member 42 being sandwiched between an outer face of the bottom wall 22 or the lid member 13 and a stepped part 23a of a peripheral wall 23 by sandwiching with the end plates 43, the through-bolt 44, and the nut 45.

Description

  The present invention provides a power storage module in which a plurality of cases in which electrode assemblies are individually accommodated in a state in which the bottom walls are arranged in the stacking direction of the electrode assemblies are juxtaposed in a state in which insertion ports and bottom walls are alternately positioned, and It relates to the manufacturing method.

  Vehicles such as EVs (Electric Vehicles) and PHVs (Plug in Hybrid Vehicles) are equipped with battery modules as power storage modules that store power supplied to the driving motor. An example of this battery module is Patent Document 1. As shown in FIG. 8, the power supply device 80 of Patent Document 1 includes a plurality of battery cells 81, a holder block 82 in which a plurality of cell slots 82 a into which the battery cells 81 are inserted are formed, and a closing plate 83. Each battery cell 81 is formed by sealing an electrode set (not shown) and an electrolyte solution (not shown) in an outer case 81a. The power supply device 80 is formed by closing the opening of the holder block 82 with a closing plate 83 in a state where the battery cell 81 is inserted into the cell slot 82a. Each battery cell 81 is fixed at a fixed position by being housed in the cell slot 82a, and a plurality of battery cells 81 are fixed integrally.

JP 2008-59849 A

  By the way, in the power supply device 80 of Patent Document 1, a plurality of completed battery cells 81 are prepared by sealing the outer case 81a and sealing the electrode set and the electrolyte in the outer case 81a. The block 82 and the closing plate 83 are used to be integrally fixed. For this reason, the power supply device 80 requires the manufacturing process of the battery cell 81 and the manufacturing process of the power supply device 80 using the battery cell 81, and there exists a problem that productivity is low.

  An object of the present invention is to provide a power storage device module capable of sealing a case insertion port at the same time as integrating a plurality of cases and improving productivity, and a method for manufacturing the power storage module. .

  In order to solve the above problems, the invention according to claim 1 is characterized in that an electrode assembly formed in a layered manner with a positive electrode and a negative electrode sandwiched between separators is housed in a case, Includes a bottom wall and a peripheral wall erected from the periphery of the bottom wall, and has an insertion port that communicates with the case and faces the bottom wall, in the stacking direction of the electrode assembly. A plurality of cases in which the electrode assemblies are individually accommodated in a state where the bottom walls are arranged are power storage modules arranged in parallel in a state where the insertion port and the bottom wall are alternately positioned, the insertion port A plurality of cases are sandwiched in the juxtaposed direction by the sandwiching members, and the insertion port is surrounded by an annular seal member. And the clamping member To the bottom wall or the lid member of another case where the sealing member is adjacent said by sandwiching a gist that it is sandwiched between the end surface of the peripheral wall facing the bottom wall or lid member.

  According to this, when manufacturing the electricity storage module, by arranging the cases side by side and sandwiching the plurality of cases with the sandwiching member, each sealing member has an outer surface or a lid member of the bottom wall of another adjacent case, The insertion port is sandwiched between end faces of the peripheral wall to seal the insertion port, and the insertion port is closed by the bottom wall or the lid member. That is, in the power storage module, the insertion port of each case is sealed only when the plurality of cases are integrated with the holding member. Therefore, as compared with the case of manufacturing the battery cells one by one by sealing the outer case as in the power supply device of the background art, and collecting and integrating a plurality of the completed battery cells, the productivity of the storage module is increased. Can be improved.

Moreover, the said sealing member may be clamped between the bottom wall of the said another adjacent case, and the end surface of the said surrounding wall facing this bottom wall.
According to this, the seal member is directly pressed against the end surface of the peripheral wall by the bottom wall of another adjacent case, and is sandwiched between the bottom wall and the end surface of the peripheral wall. For this reason, for example, compared with the case where a sealing member is pressed on the end surface of a surrounding wall via another member, the number of parts can be reduced, the manufacturing process of an electrical storage module can be reduced, and the productivity can be improved.

The seal member may be sandwiched between the lid member and an end surface of the peripheral wall facing the lid member.
According to this, the insertion port can be reliably sealed using the lid member and the seal member.

  According to a fourth aspect of the present invention, an electrode assembly formed in a layer shape with a positive electrode and a negative electrode sandwiched between separators is accommodated in a case, and the case includes a bottom wall and a bottom wall. The electrode includes a peripheral wall erected from a peripheral edge, has an insertion port that communicates with the case and faces the bottom wall, and the electrode is arranged in a state in which the bottom wall is aligned in the stacking direction of the electrode assembly. A plurality of cases in which assemblies are individually stored are power storage modules arranged in parallel with the insertion port and the bottom wall being alternately positioned, and the insertion port is adjacent to the parallel arrangement direction. The gist of the present invention is that the adjacent cases are joined together by welding.

  According to this, when manufacturing the electricity storage module, cases are arranged side by side, and the cases adjacent to each other in the direction of arrangement are joined together by welding, so that the insertion port is sealed and inserted by the bottom wall of another case. The mouth is blocked. That is, the insertion slot of each case is sealed only when the cases are welded to each other. Therefore, as compared with the case of manufacturing the battery cells one by one by sealing the outer case as in the power supply device of the background art, and collecting and integrating a plurality of the completed battery cells, the productivity of the storage module is increased. Can be improved.

  According to a fifth aspect of the present invention, an electrode assembly formed in a layered manner with a positive electrode and a negative electrode sandwiched between separators is housed in a case, and the case includes a bottom wall and a bottom wall. The electrode includes a peripheral wall erected from a peripheral edge, has an insertion port that communicates with the case and faces the bottom wall, and the electrode is arranged in a state in which the bottom wall is aligned in the stacking direction of the electrode assembly. A plurality of cases each individually accommodating an assembly are a method of manufacturing a power storage module in which the insertion port and the bottom wall are alternately positioned, wherein the electrode is inserted into the case from the insertion port. An insertion step of inserting an assembly, a stacking step of stacking the cases together while inserting a bottom wall side of another case into the insertion port of the case, and a plurality of cases while sealing the insertion port A sealing process that integrates in the parallel direction. The gist of the Rukoto.

  According to this, an electrical storage module is manufactured by performing an insertion process, performing a stacking process, stacking cases, and sealing an insertion port of these cases in a sealing process. Therefore, the storage module can seal the insertion port of each case only when a plurality of cases are integrated in the sealing step. Therefore, the storage module can be manufactured at the same time as the secondary battery is formed by each case and the electrode assembly. Therefore, as compared with the case of manufacturing the battery cells one by one by sealing the outer case as in the power supply device of the background art, and collecting and integrating a plurality of the completed battery cells, the productivity of the storage module is increased. Can be improved.

  According to the present invention, it is possible to seal a case insertion port at the same time as integrating a plurality of cases, and to improve productivity.

The disassembled perspective view which shows the battery module of embodiment. The perspective view which shows the battery module of embodiment. The disassembled perspective view which shows the component of an electrode assembly. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. Sectional drawing which shows the manufacturing method of a battery module. The fragmentary sectional view which shows another example of a battery module. The fragmentary sectional view which shows another example of a battery module. The figure which shows background art.

Hereinafter, an embodiment in which a power storage module of the present invention is embodied as a battery module will be described with reference to FIGS.
As shown in FIGS. 1 and 2, the battery module 10 is formed by integrally arranging a plurality of cases 20 each housing the electrode assembly 11.

  As shown in FIG. 3, the electrode assembly 11 includes a sheet-like positive electrode 18, a sheet-like negative electrode 19, and a sheet-like separator 40 that insulates between the positive electrode 18 and the negative electrode 19. . The electrode assembly 11 is configured in a layered manner by alternately laminating separators 40 between a plurality of positive electrodes 18 and a plurality of negative electrodes 19.

  The positive electrode 18 includes a positive electrode metal foil 21 formed of an aluminum foil, and a positive electrode active material layer 21a formed by applying a positive electrode active material on both surfaces thereof. Moreover, the metal foil 21 for positive electrodes in which the positive electrode active material is not apply | coated constitutes the non-coating part 21b. A positive electrode current collecting tab 21c made of the positive electrode metal foil 21 is provided at one end edge 18a of the positive electrode 18 so as to protrude. The positive electrode current collecting tab 21c is a part of the non-coated portion 21b. The positive electrode current collecting tab 21 c is formed in the same position and in the same shape in each positive electrode 18 constituting the electrode assembly 11.

  The negative electrode 19 has a negative electrode metal foil 25 formed of copper foil, and a negative electrode active material layer 25a formed by applying a negative electrode active material on both surfaces thereof. Moreover, the metal foil 25 for negative electrodes in which the negative electrode active material is not apply | coated constitutes the non-coating part 25b. A negative electrode current collecting tab 25c made of a negative electrode metal foil 25 is provided at one end edge 19a of the negative electrode 19 so as to protrude. The negative electrode current collecting tab 25c is a part of the non-coated portion 25b. The negative electrode current collecting tab 25 c is formed in the same position and in the same shape in each negative electrode 19 constituting the electrode assembly 11. Moreover, the negative electrode current collection tab 25c is provided in the position which does not overlap with the positive electrode current collection tab 21c.

  As shown in FIG. 1, in the electrode assembly 11, each positive electrode current collecting tab 21c is concentrated on one end side in the stacking direction of the electrode assembly 11, and the tip side is bent toward the other end side in the stacking direction. A positive electrode tab group 30 is formed. The positive electrode current collecting tab 21c at one end in the stacking direction of the positive electrode tab group 30 is connected to the positive electrode conductive member 31 that exchanges electricity with the electrode assembly 11 by resistance welding, and the positive electrode conductive member 31 is connected to the positive electrode terminal 15. Has been.

  Further, the electrode assembly 11 is formed with a negative electrode tab group 33 in which the respective negative electrode current collecting tabs 25c are concentrated on one end side in the stacking direction and the leading end side is bent toward the other end side in the stacking direction. The negative electrode current collecting tab 25c at one end in the stacking direction of the negative electrode tab group 33 is connected to the negative electrode conductive member 34 for transferring electricity with the electrode assembly 11 by resistance welding, and the negative electrode terminal 16 is connected to the negative electrode conductive member 34. Has been. The electrode assembly 11 is covered with an insulating sheet 41 except for end surfaces from which the positive electrode tab group 30 and the negative electrode tab group 33 protrude.

  The case 20 includes a rectangular plate-shaped bottom wall 22 and a rectangular tubular peripheral wall 23 erected from the periphery of the bottom wall 22. The bottom wall 22 is formed in a rectangular shape that is orthogonal to the stacking direction of the electrode assembly 11 and that is slightly larger than the planar shape on both end surfaces in the stacking direction. The peripheral wall 23 is erected vertically with respect to the bottom wall 22.

  A square annular guide portion 24 is formed on the distal end side of the peripheral wall 23. The inner peripheral surface of the guide portion 24 is expanded outward from the inner peripheral surface of the peripheral wall 23, and a step portion 23 a is formed between the inner peripheral surface of the guide portion 24 and the inner peripheral surface of the peripheral wall 23. Has been. An insertion port 20 a that communicates with the accommodation space S in the case 20 and faces the bottom wall 22 is formed inside the guide portion 24.

  As shown in FIG. 4, the electrode assembly 11 is accommodated in the accommodation space S with the bottom wall 22 aligned in the stacking direction. Further, in the case 20 located at one end of the case 20 in the juxtaposed direction, the lid member 13 having the same planar shape as the bottom wall 22 is inserted inside the guide portion 24. Further, in the case 20 other than the case 20 at one end in the juxtaposed direction (hereinafter referred to as other case 20), the bottom wall 22 side of another case 20 adjacent to the juxtaposed direction is inserted inside the guide portion 24. Has been.

  In the battery module 10, the insertion openings 20 a, the electrode assemblies 11, and the bottom wall 22 are alternately positioned along the direction in which the cases 20 are arranged side by side. In the case 20 at one end in the side-by-side direction, a rubber-made square annular seal member 42 is interposed between the lid member 13 and a step portion 23a (an end surface of the peripheral wall 23) facing the inner surface of the lid member 13. The insertion port 20a is surrounded by the seal member 42. In addition, a rubber square annular sealing member 42 is interposed between the outer surface of the bottom wall 22 of another case 20 and a step portion 23a (an end surface of the peripheral wall 23) facing the outer surface of the bottom wall 22. The insertion port 20a is surrounded by the seal member 42. Further, a plate-like end plate 43 is disposed outside the lid member 13 at one end in the juxtaposed direction and outside the bottom wall 22 of the case 20 at the other end in the juxtaposed direction.

  As shown in FIGS. 2 and 4, through bolts 44 are inserted into the four corners of both end plates 43, and nuts 45 are screwed into the through bolts 44, so that all cases 20 are arranged in parallel. It is integrated in a sandwiched state. Therefore, in the present embodiment, a clamping member that clamps the case 20 in the juxtaposition direction is configured from the through bolt 44, the nut 45, and the pair of end plates 43.

  In the battery module 10, the insertion port 20 a of the case 20 at one end in the juxtaposed direction is closed by the lid member 13. The lid member 13 is pressed toward the seal member 42, and the seal member 42 is sandwiched between the inner surface of the lid member 13 and the step portion 23a. Therefore, in the case 20 at one end in the juxtaposed direction, the insertion port 20 a is sealed by the lid member 13 and the seal member 42. Further, the lid member 13 is pressed against one end surface of the electrode assembly 11 in the stacking direction, and the electrode assembly 11 is pressed against the bottom wall 22 by the lid member 13 and a load is applied to the electrode assembly 11 in the stacking direction. Yes.

  Further, the insertion port 20a of the other case 20 is closed by the bottom wall 22 of another case 20 inserted into the insertion port 20a. The outer surface of the bottom wall 22 of each case 20 is pressed toward the seal member 42, and the seal member 42 is sandwiched between the outer surface of the bottom wall 22 and the step portion 23a. Therefore, in the other case 20, the insertion port 20 a is sealed by the bottom wall 22 and the seal member 42. Further, the outer surface of each bottom wall 22 is pressed against one end surface in the stacking direction of the electrode assembly 11, and a load is applied to the electrode assembly 11 in the stacking direction.

Next, the manufacturing method of the battery module 10 is demonstrated with an effect | action.
First, the case 20 is placed in a state where the insertion port 20a is opened upward. And the insertion process which inserts the electrode assembly 11 into the accommodation space S from the insertion port 20a is performed. Thereafter, the positive electrode terminal 15 is connected to the positive electrode tab group 30 via the positive electrode conductive member 31, and the negative electrode terminal 16 is connected to the negative electrode tab group 33 via the negative electrode conductive member 34. Further, the sealing member 42 is supported on the stepped portion 23a. As shown in FIG. 5, the electrode assembly 11 has the other end surface in the stacking direction supported by the inner bottom surface of the bottom wall 22, and the one end surface in the stacking direction slightly protrudes above the seal member 42.

  Next, the bottom wall 22 side of another case 20 is inserted into the insertion port 20a, and a stacking process for stacking the cases 20 is performed. At this time, the outer peripheral surface of the peripheral wall 23 abuts on the inner side of the guide portion 24, and the inserted case 20 is prevented from moving in a direction orthogonal to the insertion direction. In addition, the bottom wall 22 of the inserted case 20 presses the electrode assembly 11 in the lower case 20 in the stacking direction, and the bottom wall 22 of the case 20 is supported by the seal member 42.

  Thereafter, the stacking process is repeated, and the number of cases 20 that form the battery module 10 are stacked. The lid member 13 is inserted into the insertion port 20a of the last case 20. At this time, the outer peripheral surface of the lid member 13 abuts on the inner side of the guide portion 24, and the inserted lid member 13 is prevented from moving in a direction orthogonal to the insertion direction.

  Then, end plates 43 are arranged on both sides of one end and the other end of the case 20 in the side-by-side direction. Through bolts 44 are inserted into the end plates 43, nuts 45 are screwed into the through bolts 44, and all the cases 20 are integrated in a parallel arrangement direction to perform a sealing process. Then, the insertion port 20 a of the case 20 at one end in the juxtaposed direction is closed by the lid member 13, the inner surface of the lid member 13 is pressed against the seal member 42, and the insertion port 20 a is sealed by the lid member 13 and the seal member 42. Is done. The insertion port 20a of the other case 20 is closed by the bottom wall 22 of another case 20 inserted into the insertion port 20a, and the outer surface of the bottom wall 22 is pressed toward the seal member 42, so that the bottom wall 22 The insertion port 20a is sealed by the sealing member 42. Moreover, the lid member 13 and the bottom wall 22 press the electrode assembly 11 toward the bottom wall 22 along the stacking direction, and a load is applied to the electrode assembly 11.

  Therefore, by screwing the through bolt 44 and the nut 45, all the cases 20 are integrated to form the battery module 10, and at the same time, the insertion opening 20a of each case 20 is sealed. Thereafter, an electrolyte is individually injected into each case 20 from a not-shown injection hole provided in each case 20, and a secondary battery is manufactured by the case 20, the electrode assembly 11, and the electrolyte. A battery module 10 including a plurality of secondary batteries is manufactured.

According to the above embodiment, the following effects can be obtained.
(1) In the battery module 10, the bottom wall 22 side or the lid member 13 of another case 20 is inserted into the insertion port 20 a of the case 20. In a state where all the cases 20 are sandwiched and integrated in the juxtaposed direction, the sealing member 42 surrounding each insertion port 20a is sandwiched between the outer surface of the bottom wall 22 or the lid member 13 and the step portion 23a. The insertion port 20a is sealed. And when this battery module 10 is manufactured, a plurality of cases 20 arranged in parallel are sandwiched so that each sealing member 42 is located between the outer surface of the bottom wall 22 or the lid member 13 and the step portion 23a. The insertion port 20a is sealed by being sandwiched between the bottom wall 22 and the lid member 13, and the insertion port 20a is closed. That is, in the battery module 10, the insertion port 20a of each case 20 is sealed only when the plurality of cases 20 are integrated. Therefore, as compared with the case of manufacturing the battery cells one by one by sealing the outer case as in the power supply device of the background art, and collecting and integrating a plurality of the completed battery cells, the productivity of the storage module is increased. Can be improved.

  (2) When the battery module 10 is manufactured, when the other end surface in the stacking direction of the electrode assembly 11 is supported on the inner bottom surface of the bottom wall 22, the one end surface in the stacking direction of the electrode assembly 11 is higher than the seal member 42. Is in a protruding position. For this reason, when the bottom wall 22 or the lid member 13 of the case 20 is inserted into the insertion opening 20a and the plurality of cases 20 are sandwiched in the juxtaposed direction, the bottom wall 22 or the lid member 13 causes the electrode assembly 11 to On the other hand, a load in the stacking direction can be applied. For this reason, at the time of use of the battery module 10, it can suppress that the electrode assembly 11 expand | swells in a lamination direction.

  (3) In the battery module 10, the bottom wall 22 is arranged in the stacking direction of the electrode assembly 11, and the insertion port 20 a is connected to the bottom wall 22 so that the electrode assembly 11 can be inserted into the insertion port 20 a along the stacking direction. It is formed in the position which opposes. Therefore, the electrode assembly 11 can be inserted into the case 20 from the wide insertion port 20a, and the insertion operation can be easily performed.

  (4) The insertion opening 20 a of the case 20 is directly closed by the bottom wall 22 of another adjacent case 20, and the seal member 42 is directly pressed against the stepped portion 23 a by the outer surface of the bottom wall 22. For this reason, for example, compared with the case where the sealing member 42 is pressed against the stepped portion 23a via another member, the number of parts can be reduced, the manufacturing process of the battery module 10 can be reduced, and the productivity of the battery module 10 can be improved. it can.

  (5) In each secondary battery of the battery module 10, the insertion opening 20 a of the case 20 is sealed with the sealing member 42 and the bottom wall 22 of the case 20. Therefore, unlike the case where the case 20 is welded and sealed, a blowhole is not formed in the welded portion or a crack is not formed, and the reliability regarding the sealing of the insertion port 20a is prevented. Sex does not decrease. Further, there is no spatter scattering during welding, and the influence of heat during welding does not reach the electrode assembly 11.

  (6) The seal member 42 is directly pressed against the step portion 23a of the peripheral wall 23 by the outer surface of the bottom wall 22 of another case 20, and is sandwiched between the outer surface of the bottom wall 22 and the step portion 23a. For this reason, for example, compared with the case where the seal member 42 is pressed against the step portion 23a of the peripheral wall 23 via another member, the number of parts can be reduced, the manufacturing process of the battery module 10 can be reduced, and the productivity can be improved. it can.

In addition, you may change the said embodiment as follows.
In the embodiment, the plurality of cases 20 are integrated with the through bolts 44 and the nuts 45, and the sealing member 42 is pressed against the step portion 23a while closing the insertion port 20a with the lid member 13 or the bottom wall 22. Although the insertion port 20a is sealed, the method of sealing the insertion port 20a is not limited to this. As shown in FIG. 6, while inserting the bottom wall 22 side of another case 20 into each insertion port 20a, the lid member 13 is inserted into the insertion port 20a of the case 20 at one end in the juxtaposition direction. Then, with the bottom wall 22 or the lid member 13 supported on the stepped portion 23a, the peripheral wall 23 or the lid member 13 and the guide portion 24 are welded to form a welded portion 51 to seal the insertion port 20a. May be.

  Even if comprised in this way, since the case 20 can be integrated at the same time as the insertion port 20a of each case 20 is sealed by welding, the battery module 10 is sealed at the same time as all the insertion ports 20a are sealed. Manufactured. Therefore, productivity can be improved compared with the case where a secondary battery is manufactured one by one and a plurality of completed secondary batteries are collected and integrated to manufacture a battery module.

  In the embodiment, except for the insertion port 20a of the case 20 at one end in the juxtaposed direction, the insertion port 20a is closed while directly pressing the seal member 42 against the stepped portion 23a by the outer surface of the bottom wall 22 of another case 20. Not limited to this. As shown in FIG. 7, the lid member 46 is placed on the seal member 42 supported by the step portion 23 a, and the insertion port 20 a is closed by the lid member 46, while the lid member 46 is covered by the outer surface of the bottom wall 22 of the case 20. May be pressed against the seal member 42 to press the seal member 42 against the stepped portion 23a.

When configured in this manner, the insertion port 20 a can be reliably sealed by the lid member 46 and the seal member 42.
In the embodiment, the peripheral wall 23 of the case 20 is erected vertically to the bottom wall 22, but the peripheral wall 23 may be erected with respect to the bottom wall 22. For example, the peripheral wall 23 may be erected so that the opening becomes narrower from the proximal end side toward the distal end side.

  In the embodiment, the plurality of cases 20 are sandwiched by the end plates 43 and integrated in the juxtaposed direction. However, the method of integrating the plurality of cases 20 may not be sandwiched by the end plates 43. For example, the entire case 20 may be surrounded by a rubber band and integrated in the juxtaposed direction.

In the embodiment, the guide portion 24 is formed on the distal end side of the peripheral wall 23, but the guide portion 24 may not be provided.
In embodiment, although the electrode assembly 11 was made into the laminated type, it is not restricted to this. The electrode assembly may be a wound type by interposing a strip-shaped separator between the strip-shaped positive electrode and the negative electrode and winding them around the winding axis in a spiral manner.

  In the embodiment, the power storage module is embodied in the battery module 10. However, the present invention is not limited to this. For example, the power storage module may be embodied in a power storage module in which a plurality of power storage devices such as an electric double layer capacitor are arranged in parallel.

  DESCRIPTION OF SYMBOLS 10 ... Battery module as an electrical storage module, 11 ... Electrode assembly, 13, 46 ... Lid member, 18 ... Positive electrode, 19 ... Negative electrode, 20 ... Case, 20a ... Insertion port, 22 ... Bottom wall, 23 ... Perimeter wall, 23a ... a step as an end face of the peripheral wall, 40 ... a separator, 42 ... a seal member, 46 ... a lid member.

Claims (5)

An electrode assembly formed in a layered manner with a separator sandwiched between a positive electrode and a negative electrode is housed in the case,
The case includes a bottom wall and a peripheral wall erected from a peripheral edge of the bottom wall, and has an insertion port that communicates with the case and faces the bottom wall.
A plurality of cases in which the electrode assemblies are individually accommodated in a state in which the bottom walls are arranged in the stacking direction of the electrode assemblies, are arranged in parallel with the insertion port and the bottom wall being alternately positioned. Because
The insertion port is closed by a lid member or a bottom wall of another case adjacent in the juxtaposition direction, and the plurality of cases are sandwiched in the juxtaposition direction by sandwiching members,
The insertion port is surrounded by an annular seal member, and the seal member is sandwiched between the bottom wall of the other case or the lid member by the sandwiching member, and the peripheral wall facing the bottom wall or the lid member. A power storage module characterized by being sandwiched between an end surface.   2. The power storage module according to claim 1, wherein the seal member is sandwiched between a bottom wall of another adjacent case and an end surface of the peripheral wall facing the bottom wall.   The power storage module according to claim 1, wherein the sealing member is sandwiched between the lid member and an end surface of the peripheral wall facing the lid member. An electrode assembly formed in a layered manner with a separator sandwiched between a positive electrode and a negative electrode is housed in the case,
The case includes a bottom wall and a peripheral wall erected from a peripheral edge of the bottom wall, and has an insertion port that communicates with the case and faces the bottom wall.
A plurality of cases in which the electrode assemblies are individually accommodated in a state in which the bottom walls are arranged in the stacking direction of the electrode assemblies, are arranged in parallel with the insertion port and the bottom wall being alternately positioned. Because
The insertion slot is closed by the bottom walls of the cases adjacent to each other in the juxtaposition direction, and the adjacent cases are joined together by welding. An electrode assembly formed in a layered manner with a separator sandwiched between a positive electrode and a negative electrode is housed in the case,
The case includes a bottom wall and a peripheral wall erected from a peripheral edge of the bottom wall, and has an insertion port that communicates with the case and faces the bottom wall.
A plurality of cases in which the electrode assemblies are individually accommodated in a state in which the bottom walls are arranged in the stacking direction of the electrode assemblies, are arranged in parallel with the insertion port and the bottom wall being alternately positioned. A manufacturing method of
An insertion step of inserting the electrode assembly into the case from the insertion port;
A stacking step of stacking the cases together while inserting the bottom wall side of another case into the insertion port of the case;
And a sealing step of integrating the plurality of cases in the side-by-side direction while sealing the insertion opening.