JP2019061830A - Power storge module and power storage pack - Google Patents

Abstract

To enable downsizing and compactification with a simple structure, and readily perform work for connecting bus-bars to terminal tabs of a power-storage cell while preventing a volume energy density from lowering.SOLUTION: A power storge module 1 is provided, which comprises: a plurality of power-storage cells 2 each having a chargeable/dischargeable power storage element enclosed in an outer packaging body 10 formed by a laminate film, and terminal tabs 12 connected to the power storage element, and partially protrude to outside the outer packaging body; and bus-bars 3 connected to the terminal tabs respectively, and serving to electrically connect the plurality of power-storage cells mutually. The plurality of power-storage cells are laid out in parallel so that the terminal tabs are arrayed in one direction L1 with the terminal tabs opposite each other. In the bus-bars, foldable/bendable weakened lines 50 are formed corresponding to the terminal tabs. Each bus-bar is connected to the terminal tabs with its parts 46 opposed to the terminal tabs by being folded/bent along the weakened lines.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a storage module and a storage pack.

For example, a chargeable / dischargeable secondary battery such as a lithium ion secondary battery is known as a storage cell. In recent years, from the viewpoint of light weight, low cost, simplicity of structure, ease of handling, etc., a flat shape in which a storage element in which a positive electrode and a negative electrode are laminated with a separator interposed is housed in a metal laminate film in a sealed state. Laminated secondary batteries are attracting attention.
This type of laminated secondary battery is suitably used, for example, in devices in various fields such as mobile devices, industrial devices, medical devices, etc. However, higher power and large capacity may be required. In order to meet such requirements, a battery module (storage module) in which a plurality of laminated secondary batteries are electrically connected is known.

  For example, as shown in Patent Document 1 below, a laminate cell battery structure (storage module) is known that includes a plurality of laminate cell batteries and a holding frame that holds the plurality of laminate batteries. The holding frame is a holding frame piece in which a plurality of insertion holes into which the electrodes of each laminated cell battery are inserted are formed corresponding to the number of laminated cell batteries, and an electrode of each laminated cell battery inserted into the insertion holes And a connecting member electrically connecting the

  Furthermore, as disclosed in Patent Document 2 below, a battery module (electric storage module) is known that includes a plurality of pouch type battery cells and a bus bar electrically connecting the electrode terminals of each pouch type battery cell. ing. In order to prevent the electrical connection positions from interfering with each other, the electrode terminals of the pouch type battery cells have different lengths, and are electrically connected at positions shifted with respect to the bus bars.

JP, 2011-181369, A Japanese Patent Application Publication No. 2014-521197

  However, in the above-described conventional laminate cell battery structure, it is necessary to combine holding frame pieces with a plurality of laminate cell batteries while inserting the electrodes of each laminate cell battery into the insertion holes, respectively, and then each laminate cell It is necessary to further assemble the connecting member to the battery electrode. Therefore, the operation is complicated, it is difficult to efficiently connect the electrodes, and there is room for improvement. In addition, since the holding frame piece and the connecting member are required to electrically connect the respective electrodes, the number of parts is increased, and the structure is easily complicated.

  Further, in the above-described conventional battery module, since it is necessary to make the lengths of the electrode terminals of the respective laminated secondary batteries different, the external size of the entire battery module tends to be large, and there is room for improvement. In addition, the electrical connection positions of the electrode terminals are shifted from each other, resulting in an increase in the contact area to the bus bar. Therefore, the volumetric energy density is apt to be reduced, and the performance as a battery is easily reduced.

  The present invention has been made in view of such circumstances, and the object of the present invention is to achieve downsizing and downsizing with a simple configuration, and to connect the bus bar to the terminal tab of the storage cell, It is providing a storage module and a storage pack that can be easily performed while preventing a reduction in volumetric energy density.

(1) A storage module according to the present invention includes a chargeable / dischargeable storage element housed in an outer package formed of a laminate film, and a part of the storage element connected to the storage element and projecting out of the outer package. And a plurality of storage cells each having a terminal tab, and a bus bar connected to the terminal tab to electrically connect the plurality of storage cells, and the plurality of storage cells Are arranged parallel to one another such that the terminal tabs are aligned in one direction, and foldable weakening lines are formed corresponding to the terminal tabs on the busbars, and the busbars are along the weakening lines By bending the terminal tab, a part of the terminal tab is connected to the terminal tab in a state of being disposed to face the terminal tab.

According to the storage module of the present invention, since the plurality of storage cells arranged in parallel are electrically connected (series connection or parallel connection) by the bus bars, voltage is applied to the plurality of storage cells through the bus bars can do. Thus, the storage elements of the plurality of storage cells can be charged and discharged, and high output and large capacity power can be obtained.
In particular, the bus bar is bent along the weakening line formed correspondingly to the terminal tab so that a part of the bus bar is connected to the respective terminal tab in a state of being arranged to face each other. Thus, part of the bus bar can be brought into surface contact with each of the terminal tabs, and electrical connection and mechanical connection can be reliably made to the terminal tabs by, for example, welding or the like. Therefore, a high quality storage module with stable operation reliability can be obtained.

  Further, since a part of the bus bar is arranged to face each of the terminal tabs by bending the bus bar along the weakening line, unlike the conventional case, for example, the length of the terminal tab of a specific storage cell is lengthened, etc. There is no need for measures Therefore, downsizing and downsizing of the entire storage module can be achieved. Moreover, the contact area of the bus bar with respect to the terminal tab can be made uniform at each terminal tab, and since the contact area can be suppressed to the necessary minimum, it is possible to prevent the volume energy density from decreasing. .

  In addition, it is possible to connect parts of the bus bar while arranging to face the terminal tab by a simple operation of bending the bus bar along the weakening line. Therefore, when connecting the bus bar to the terminal tab, components other than the bus bar Is unnecessary. Therefore, the number of parts can be reduced, and the configuration can be simplified.

Furthermore, since the bus bar is configured to be bent along the weakening line, it is possible to connect the bus bar to each terminal tab before bending the bus bar. In this case, for example, at the stage before the bus bar is completely bent, the part of the bus bar and each terminal tab are mechanically and electrically connected by welding or the like. At this stage, since it is not necessary to arrange a plurality of terminal tabs in one direction, connection work can be performed reliably while securing a sufficient work space necessary for connection work. Then, after connecting each of the terminal tabs and the bus bar, the plurality of storage cells are arranged in parallel while bending the bus bar along the weakening line. Thus, the plurality of storage cells arranged in parallel can be electrically connected in series by using the bus bar.
As described above, since it is possible to perform the connection work of the bus bar to each terminal tab before completely bending the bus bar, the connection work to the bus bar can be easily performed. Therefore, as a result, a storage module excellent in assembly workability can be obtained.

(2) The weakening line may be formed by a thin-walled line formed thinner than the other portions of the bus bar excluding the weakening line.

  In this case, since the weakening line is formed of a thin-walled line, the bus bar can be bent precisely along the weakening line, and the bus bar can be easily bent without requiring an excessive stress. Therefore, it is possible to obtain an electricity storage module further excellent in assembly workability.

(3) The weakening line may be formed by a broken line which bulges in a convex shape in the bending direction of the bus bar and has a concave streak formed on the opposite side to the bending direction.

  In this case, since the weakening line is formed by a broken line (breaking line), the bending direction of the bus bar can be guided by the weakening line. That is, the bus bar can be guided to bend toward the side opposite to the streak. Therefore, the bus bar can be appropriately bent in a targeted direction, for example, like a mountain fold or a valley fold, and a storage module further excellent in assembly workability can be obtained.

(4) The weakening line may be formed by arranging a plurality of through holes penetrating the bus bar in the thickness direction at intervals.

  In this case, since the weakening line can be formed in the shape of a perforation in which a plurality of through holes are arranged in a line, the bus bar can be bent precisely along the weakening line and an excessive stress is required. The bus bar can be easily bent without. Therefore, it is possible to obtain an electricity storage module further excellent in assembly workability.

(5) The bus bar includes a bus bar main body portion disposed along the one direction, and a bus bar connection portion connected to the bus bar main body portion and formed in plurality corresponding to the terminal tab. The weakening line is formed in the bus bar main body, and the plurality of bus bar connecting parts are connected in a state in which the plurality of bus bar connecting parts are disposed to be opposed to the terminal tab by bending the bus bar main body along the weakening line. It may be done.

  In this case, since the weakening line is formed in the bus bar main body connecting the plurality of bus bar connecting portions, the stress accompanying the bending is transmitted to the bus bar connecting portion when the bus bar main portion along the weakening line is bent. It is easy to control. Therefore, stress due to bending of the bus bar main body portion hardly acts on the connection portion between the terminal tab and the bus bar connection portion, and the connection state between the terminal tab and the bus bar connection portion can be stably maintained. Thereby, for example, welding peeling and the like can be effectively prevented, and a high quality storage module can be obtained.

(6) The bus bar main body portion and the bus bar connecting portion are current blocking members that cut off the electrical connection between the bus bar main portion and the bus bar connecting portion when an overcurrent exceeding a prescribed value flows. It may be connected via.

  In this case, for example, when the storage cell is short-circuited due to some cause, an overcurrent resulting from the short circuit flows from the storage cell to the bus bar main body through the terminal tab and the bus bar connection portion. It can prevent using a blocking member. Therefore, it is possible to prevent an overcurrent from a short-circuited storage cell from flowing to the remaining storage cell via the bus bar. Therefore, the safety of the storage module can be enhanced, and a higher quality storage module with improved operational reliability can be obtained.

(7) The storage pack according to the present invention includes the storage module, an external connection terminal, and an external connection circuit having an external connection wiring that electrically connects the external connection terminal and the bus bar.

  According to the storage pack of the present invention, power from a plurality of storage cells can be supplied to an external device via the external connection terminal. In particular, as described above, since the storage module that can be miniaturized and downsized with a simple configuration is provided, the storage pack itself can be downsized and downsized, and the handling property is improved. For example, various suitable uses can be made. The storage pack may have two or more storage modules.

  According to the present invention, downsizing and downsizing can be achieved with a simple configuration, and the connecting operation of the bus bar to the terminal tab of the storage cell can be easily performed while preventing the volume energy density from decreasing. It is possible to obtain a storage module and a storage pack that can be used.

It is a figure showing a 1st embodiment of the present invention, and is a top view of a battery module. It is the perspective view which expanded a part of battery module shown in FIG. It is the side view which looked at the battery module shown in FIG. 2 from the negative electrode bus-bar side. It is a perspective view of the lithium ion secondary battery shown in FIG. It is the side view which looked at the lithium ion secondary battery shown in FIG. 4 from the negative electrode terminal tab side. It is a longitudinal cross-sectional view of the lithium ion secondary battery which followed the AA shown in FIG. It is a perspective view which shows the state before bending the negative electrode bus-bar shown in FIG. 1 along a weakening line. It is a process drawing at the time of assembling the battery module shown in FIG. 1, and is a side view which shows the state which connected the terminal tab of the lithium ion secondary battery shifted up and down, and the bus-bar connection part of a bus-bar. It is the front view which looked at the battery module shown in FIG. 8 from the 1st connection terminal part side. It is a figure showing a 2nd embodiment of the present invention, and is a perspective view which expanded a part of battery module. It is a perspective view which shows the state before bending the negative electrode bus-bar shown in FIG. 10 along a weakening line. It is a figure showing a 3rd embodiment of the present invention, and is a perspective view which expanded a part of battery module. It is a perspective view which shows the state before bending the negative electrode bus-bar shown in FIG. 12 along a weakening line. It is a figure showing a 4th embodiment of the present invention, and is a perspective view which expanded a part of battery module. It is a figure which shows 5th Embodiment of this invention, Comprising: It is a top view of the battery pack which comprises several battery modules.

First Embodiment
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In the present embodiment, a battery module having a plurality of lithium ion secondary batteries will be described as an example of the storage module. In each drawing, the scale of each component is appropriately changed in order to make it easy to see the drawing and to help the understanding of the invention.

  As shown in FIGS. 1 to 3, in the battery module 1 of the present embodiment, a plurality of lithium ion secondary batteries (storage cells according to the present invention) 2 and a plurality of lithium ion secondary batteries 2 are electrically connected. And a bus bar 3 connected in parallel.

In the present embodiment, the case of including six lithium ion secondary batteries 2 will be described as an example, but the present invention is not limited to this case, and the number of lithium ion secondary batteries 2 may be appropriately changed. I do not care. For example, the battery module 1 may include two lithium ion secondary batteries 2.
Furthermore, in the present embodiment, the case where each lithium ion secondary battery 2 is disposed along the vertical direction will be described as an example. In addition, along the vertical direction, the later-described terminal tab 12 side of the lithium ion secondary battery 2 is referred to as upper side, and the opposite direction is referred to as lower side.

  The six lithium ion secondary batteries 2 are arranged in parallel in the horizontal direction so that the terminal tabs 12 are aligned in one direction with the terminal tabs 12 facing each other. In the horizontal direction, the direction in which the lithium ion secondary batteries 2 are arranged (that is, the one direction) is referred to as a first direction L1, and the horizontal direction perpendicular to the first direction L1 is referred to as a second direction L2. .

(Lithium ion secondary battery)
The lithium ion secondary battery 2 will be described.
As shown in FIGS. 4 to 6, the lithium ion secondary battery 2 of the present embodiment is formed in a rectangular shape in a side view longer in the vertical direction than in the second direction L2, and the first direction L1. Along the thickness is formed in a thin flat shape. However, the external shape of the lithium ion secondary battery 2 is not limited to this case, and may be formed, for example, in a square shape in a side view.

  The lithium ion secondary battery 2 includes an exterior body 10 formed of a laminate film, a chargeable / dischargeable laminated electrode (storage element according to the present invention) 11 accommodated in a sealed state in the exterior body 10, and a laminated electrode 11 And a terminal tab 12 partially projecting to the outside of the exterior body 10.

  The laminated electrode 11 includes the positive electrode 20, the negative electrode 21, and the separator 22, and is configured by laminating the positive electrode 20, the negative electrode 21, and the separator 22 in the first direction L1. Specifically, the positive electrode 20, the separator 22, and the negative electrode 21 are stacked in this order so that the positive electrode 20 and the negative electrode 21 are disposed to face each other in the first direction L1 with the separator 22 interposed therebetween.

  The positive electrode 20 includes, for example, a plate-like or film-like positive electrode current collector 25 and a positive electrode active material layer 26 stacked on the positive electrode current collector 25. In the illustrated example, the positive electrode active material layer 26 is disposed on the separator 22 side. However, the present invention is not limited to this case, and the positive electrode current collector 25 may be disposed on the separator 22 side.

  As the positive electrode current collector 25, for example, a thin metal plate or thin film of aluminum, stainless steel, copper, nickel, iron, titanium or the like can be used. However, the present invention is not limited to this case, and the positive electrode current collector 25 may be formed of a conductive material.

The positive electrode active material layer 26 includes, for example, a positive electrode active material and a positive electrode binder.
The positive electrode active material is not particularly limited as long as it can occlude and release lithium ions. For example, as a positive electrode active material, spinel type positive electrode active material (for example, LiMn ₂ O ₄ , LiNi _0.5 Mn _1.5 O ₄ ), layered oxide type positive electrode active material (for example, LiMnO ₂ , LiCoO ₂ , LiNiO ₂ , Using LiNi _0.33 Co _0.33 Mn _0.33 O ₂ , LiNi _0.8 Co _0.15 Al _0.05 O ₂ ), an olivine-based positive electrode active material (eg LiFePO ₄ , LiCoPO ₄ , LiNiPO ₄ ), etc. be able to.
As the positive electrode binder, for example, polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE) or the like can be used.

The positive electrode active material layer 26 may further have a positive electrode conductive material as needed.
As the positive electrode conductive material, for example, carbon materials such as acetylene black, ketjen black, vapor grown carbon fiber (VGCF), graphene, carbon nanotube (CNT) and the like can be used.

  Similar to the positive electrode 20 described above, the negative electrode 21 includes, for example, a plate-like or film-like negative electrode current collector 27 and a negative electrode active material layer 28 stacked on the negative electrode current collector 27. In the illustrated example, the negative electrode active material layer 28 is disposed on the separator 22 side. However, the present invention is not limited to this case, and the negative electrode current collector 27 may be disposed on the separator 22 side.

  As the negative electrode current collector 27, for example, a thin metal plate or thin film of aluminum, stainless steel, copper, nickel, iron, titanium or the like can be used as in the case of the positive electrode current collector 25. However, the present invention is not limited to this case, and the negative electrode current collector 27 may be formed of a conductive material.

Similarly to the positive electrode active material layer 26, the negative electrode active material layer 28 includes, for example, a negative electrode active material and a negative electrode binder.
The negative electrode active material is not particularly limited as long as it can occlude and release lithium ions. For example, as the negative electrode active material, metal lithium, lithium alloy, metal oxide, metal sulfide, metal nitride, graphite, a carbon material such as graphite, or the like can be used.
As the negative electrode binder, for example, in addition to the same as the positive electrode binder, polyimide, polyamide, polyamide imide, carboxymethyl cellulose, styrene butadiene rubber and the like can be used.

The negative electrode active material layer 28 may further have a negative electrode conductive material as needed.
As the negative electrode conductive material, carbon materials such as acetylene black, ketjen black, vapor grown carbon fiber (VGCF), graphene, carbon nanotube (CNT) and the like can be used as in the case of the positive electrode conductive material.

  The separator 22 is an isolation member which isolates the positive electrode 20 and the negative electrode 21 and regulates the direct contact between the positive electrode 20 and the negative electrode 21. The separator 22 is formed of, for example, a polyolefin microporous film such as polypropylene and polyethylene. .

In the laminated electrode 11 configured as described above, in the present embodiment, the positive electrode current collector 25 and the negative electrode current collector 27 slightly project upward beyond the positive electrode active material layer 26 and the negative electrode active material layer 28. . The terminal tab 12 is connected to the upper end portion of the positive electrode current collector 25 and the upper end portion of the negative electrode current collector 27 which protrude above the positive electrode active material layer 26 and the negative electrode active material layer 28.
The terminal tab 12 includes a positive electrode terminal tab 30 connected to the positive electrode current collector 25 and a negative electrode terminal tab 31 connected to the negative electrode current collector 27.

The positive electrode terminal tab 30 and the negative electrode terminal tab 31 are thin plate-like lead terminals formed of a conductive material such as aluminum.
The lower end portion 30 a of the positive electrode terminal tab 30 is connected to the upper end portion of the positive electrode current collector 25 by, for example, welding (spot welding or the like). In addition, the connection method of the positive electrode terminal tab 30 and the positive electrode collector 25 is not limited to welding, You may connect by the other known method. The upper end portion 30 b of the positive electrode terminal tab 30 protrudes above the exterior body 10 and is exposed to the outside.
The lower end portion 31 a of the negative electrode terminal tab 31 is connected to the upper end portion of the negative electrode current collector 27 by, for example, welding, similarly to the positive electrode terminal tab 30. The upper end portion 31 b of the negative electrode terminal tab 31 protrudes above the exterior body 10 and is exposed to the outside.

The positive electrode terminal tab 30 is formed so that the length along the second direction L2 is slightly longer than the length along the second direction L2 of the negative electrode terminal tab 31. Thus, the positive electrode terminal tab 30 and the negative electrode terminal tab 31 can be easily distinguished at a glance.
However, the present invention is not limited to this case, and the positive electrode terminal tab 30 and the negative electrode terminal tab 31 may be formed in the same shape. Furthermore, the positive electrode terminal tab 30 and the negative electrode terminal tab 31 may be configured to be distinguishable by, for example, display by decoration, color, etc., instead of discrimination by shape.

An electrolyte (not shown) for moving lithium ions between the positive electrode 20 and the negative electrode 21 is accommodated in the inside of the package 10 in a sealed state together with the above-described laminated electrode 11.
Examples of the electrolyte include a non-aqueous electrolytic solution (organic electrolytic solution) in which a lithium salt in which water is removed similarly is dissolved in a non-aqueous solvent in which water is previously removed to a specified value or less.

The non-aqueous solvent is not particularly limited as long as it can dissolve the lithium salt. For example, as a non-aqueous solvent, propylene carbonate, ethylene carbonate, diethyl carbonate, dimethyl carbonate, ethyl methyl carbonate, an ionic liquid or the like can be used.
The lithium salt used in the electrolytic solution may be any lithium salt used in the general lithium ion secondary battery 2, and is not particularly limited. For example, LiPF ₆ , LiBF ₄ , LiN (CF ₃ SO _{3 2) 2, LiCF 3 SO 3} , LiC (CF 3 SO 2) 3, LiN (SO 2 CF 3) 2, LiN (SO 2 F) 2 and LiClO ₄ and the like.

As described above, the exterior body 10 seals the laminated electrode 11 and the electrolyte inside, and prevents, for example, the leakage of the electrolyte to the outside and the intrusion of moisture, dust, and the like from the outside. The exterior body 10 is formed of a laminate film, more specifically, formed of a metal laminate film in which both surfaces of the metal foil 35 are coated with a polymer film 36.
However, the present invention is not limited to this case, and a metal laminate film in which one side of the metal foil 35 is coated with the polymer film 36 may be used. In this case, a metal laminate film may be used so that the polymer film 36 is positioned inside (on the side of the laminated electrode 11).
In the drawings other than FIG. 6, the metal foil 35 and the polymer film 36 are omitted to make the drawing easy to see.

For example, an aluminum foil can be used as the metal foil 35. As the polymer film 36, polypropylene or the like can be used.
As the polymer film 36 located on the outer side of the polymer film 36, a polymer having a high melting point, for example, polyethylene terephthalate (PET), polyamide or the like is preferably used, and the polymer film 36 is positioned on the inner side (laminated electrode 11 side). It is preferable to use polyethylene (PE), polypropylene (PP) or the like as the polymer film 36 to be formed.

The exterior body 10 formed as described above is folded upward at the lower side of the stacked electrode 11, and is stacked in the first direction L1 in a state in which the stacked electrode 11 and the electrolyte are accommodated therein. Then, in the exterior body 10 overlapped in the first direction L1, the outer edge portions 37 located on the outer side of the laminated electrode 11 in the second direction L2 and the outer edge portions 38 located on the upper side than the laminated electrode 11 Are integrally welded by thermocompression bonding or the like.
Thereby, the laminated electrode 11 and the electrolyte are housed in the outer package 10 in a sealed state. Further, the upper end portion 30 b of the positive electrode terminal tab 30 and the upper end portion 31 b of the negative electrode terminal tab 31 are in a state of projecting upward beyond the exterior body 10.

  In the lithium ion secondary battery 2 configured as described above, as described above, as shown in FIGS. 1 to 3, the terminal tabs 12, that is, the positive terminal tabs 30, and the negative terminal tabs 31 are They are arranged in parallel along the first direction L1 so as to face each other. In the illustrated example, the six lithium ion secondary batteries 2 are arranged in parallel with a slight gap in the first direction L1.

(Bus bar)
The bus bar 3 will be described.
As shown in FIGS. 1 to 3, the bus bar 3 electrically connects the positive electrode terminal tabs 30 of the lithium ion secondary batteries 2 to each other, and the negative electrode terminal tabs 31 of the lithium ion secondary batteries 2. And a negative bus bar 41 electrically connecting the two.

  The positive electrode bus bar 40 and the negative electrode bus bar 41 basically have the same configuration except that the direction in which the bus bar connecting portion 46 protrudes from the bus bar main body 45 described later is different. Specifically, the positive electrode bus bar 40 and the negative electrode bus bar 41 are configured in line symmetry about an imaginary line V (see FIG. 1) extending along the first direction L1. Therefore, in the present embodiment, the negative electrode bus bar 41 will be described in detail, and the description of the positive electrode bus bar 40 will be omitted.

  The negative bus bar 41 is connected to the long plate-like bus bar main body 45 disposed along the first direction L 1 and the bus bar main body 45, and the negative electrode terminal tab of each lithium ion secondary battery 2. And a plurality of (six) plate-shaped bus bar connection portions 46 formed corresponding to the reference numeral 31.

The bus bar main body portion 45 is disposed above the exterior body 10 of the lithium ion secondary battery 2 and is outside the negative electrode terminal tab 31 in the second direction L2 (that is, the positive electrode terminal tab with the negative electrode terminal tab 31 interposed therebetween). 30 is disposed on the opposite side of the second direction L2.
The end of the bus bar main body 45 located on one side in the first direction L1 functions as the first connection terminal 47, and the end located on the other side in the first direction L1 functions as the second connection terminal 48. Do. Thereby, it is possible to electrically connect the bus bar main body 45 and the outside via at least one of the first connection terminal 47 and the second connection terminal 48. .

A plurality of bendable weakening lines 50 are formed in the bus bar main body 45 corresponding to the respective negative electrode terminal tabs 31. In FIG. 1, the weakening line 50 is omitted to make the drawing easy to see.
In the present embodiment, in the bus bar main body portion 45, two weakening lines 50 are formed for one negative electrode terminal tab 31. The bus bar main body 45 extends in the first direction L1 as a whole in a state of being bent along the weakening lines 50.

Specifically, when viewed from above, the bus bar main body 45 is bent such that a valley fold protruding downward and a mountain fold protruding upward appear alternately in the first direction L1. . That is, the bus bar main body 45 extends in the first direction L1 as a whole in a state of being repeatedly bent in the vertical direction.
More specifically, a plurality of bus bar main body portions 45 are formed corresponding to the negative electrode terminal tabs 31, and are arranged at intervals in the first direction L1 and in the vertical direction so as to be parallel to the negative electrode terminal tabs 31. And a plurality of inclined wall portions 45b disposed between the vertical wall portions 45a adjacent in the first direction L1.

  With the lower end portion of the vertical wall portion 45 a positioned slightly above the exterior body 10 and the upper end portion positioned slightly above the negative electrode terminal tab 31, the second wall portion 45 a is second from the negative electrode terminal tab 31. It is disposed outside the direction L2.

  In the relationship between the vertical wall portions 45a adjacent to each other in the first direction L1, the inclined wall portion 45b has an upper end portion of one vertical wall portion 45a positioned on the first connection terminal portion 47 side and a second connection terminal portion 48 side. And the lower end of the other vertical wall 45a located at That is, in the relationship between the vertical wall portions 45a adjacent to each other in the first direction L1, the inclined wall portion 45b is the second connection terminal portion from the upper end portion of one vertical wall portion 45a located on the first connection terminal portion 47 side. As it goes to the lower end of the other vertical wall 45a located on the 48 side, it inclines so as to extend gradually downward. The inclined wall 45b connects the vertical wall 45a adjacent to each other in the first direction L1 in the above-described inclined state.

A connecting portion between the vertical wall 45 a and the inclined wall 45 b is a weakening line 50.
The first connection terminal portion 47 is connected to the lower end portion of the vertical wall portion 45a disposed at a position closest to the first connection terminal portion 47 among the plurality of vertical wall portions 45a. The connection portion between the first connection terminal portion 47 and the vertical wall portion 45 a is a weakening line 50. The second connection end portion is connected to the lower end portion of the inclined wall portion 45b disposed at a position closest to the second connection terminal portion 48 among the plurality of inclined wall portions 45b. The connecting portion between the second connection terminal portion 48 and the inclined wall portion 45 b is a weakening line 50.

The weakening line 50 is a line in which the mechanical strength of the negative electrode bus bar 41 is lower than that of other portions. In the present embodiment, as shown in FIG. 7, the weakening line 50 is formed by a thin line formed thinner than the other portions of the negative electrode bus bar 41 excluding the weakening line 50.
FIG. 7 is a perspective view of negative bus bar 41 in a state (a flat surface development state) before bending bus bar main body 45 along weakening line 50.

As shown in FIG. 2, the bus bar connecting portion 46 is integrally connected to the vertical wall 45 a of the bus bar main body 45. Specifically, the bus bar connecting portion 46 is formed to project from the vertical wall 45 a toward the negative electrode terminal tab 31 along the second direction L2. Thus, the bus bar connection portion 46 is disposed to face the negative electrode terminal tab 31 in the first direction L1.
In particular, since the bus bar connecting portion 46 is connected to the vertical wall 45 a of the bus bar main body 45, the negative electrode terminal tab 31 is formed along with the bending of the bus bar main body 45 along the weakening line 50 as described above. It is arranged opposite to the other.

  The bus bar connecting portion 46 is connected by, for example, welding (spot welding) in a state where the bus bar connecting portion 46 is disposed to face the negative electrode terminal tab 31. In addition, the connection method of the bus-bar connection part 46 and the negative electrode terminal tab 31 is not limited to welding, You may connect by the other known method.

As described above, since positive electrode bus bar 40 has the same configuration as negative electrode bus bar 41 described above, the same reference numerals are given to the same parts as the constituent elements in negative electrode bus bar 41 and the description thereof is omitted. .
That is, the positive electrode bus bar 40 has the first connection terminal portion 47, the second connection terminal portion 48, the vertical wall 45a and the inclined wall 45b, and the bus bar main portion 45 in which the weakening line 50 is formed; It has 46 and.

(Function of battery module)
Next, the operation of the battery module 1 configured as described above will be described.
According to the battery module 1 of the present embodiment, as shown in FIG. 1 and FIG. 2, the positive electrode bus bars 40 electrically connect the positive electrode terminal tabs 30 of the lithium ion secondary batteries 2 to one another, and Since the negative electrode bus bars 41 electrically connect the negative electrode terminal tabs 31 of the secondary battery 2 to one another, the plurality of lithium ion secondary batteries 2 can be connected in parallel via the positive electrode bus bars 40 and the negative electrode bus bars 41. . Therefore, voltages can be applied to the plurality of lithium ion secondary batteries 2 via the positive electrode bus bar 40 and the negative electrode bus bar 41, respectively.

Thereby, in each lithium ion secondary battery 2, lithium ions move between the positive electrode 20 and the negative electrode 21 through the electrolyte, and are absorbed and released in the positive electrode active material layer 26 and the negative electrode active material layer 28. As a result, transfer of charge is performed by the electrochemical reaction, and charge and discharge are performed. The lithium ions are released from the positive electrode 20 at the time of filling and stored in the negative electrode 21, and released from the negative electrode 21 at the time of discharge and stored in the positive electrode 20.
Therefore, the stacked electrodes 11 of the plurality of lithium ion secondary batteries 2 can be charged and discharged, and high power and large capacity power can be obtained through the positive electrode bus bar 40 and the negative electrode bus bar 41.

  In particular, the positive electrode bus bar 40 and the negative electrode bus bar 41 are bent along the weakening line 50 so that a part of the positive electrode bus bar 40 and the negative electrode bus bar 41 respectively in the first direction with respect to each positive electrode terminal tab 30 and each negative electrode terminal tab 31. It is connected in a state where it is disposed opposite to L1. Thus, the bus bar connecting portion 46 can be in surface contact with each positive electrode terminal tab 30 and each negative electrode terminal tab 31, and electrical connection and mechanical connection for each positive electrode terminal tab 30 and each negative electrode terminal tab 31. Can be done reliably. Therefore, a high quality battery module 1 with stable operation reliability can be obtained.

Further, since the bus bar connecting portion 46 is disposed to face each of the positive electrode terminal tabs 30 and the respective negative electrode terminal tabs 31 in the first direction L1 by bending the bus bar main body portion 45 along the weakening line 50, the related art However, it is not necessary to take measures such as, for example, lengthening the positive electrode terminal tab 30 and the negative electrode terminal tab 31 of the specific lithium ion secondary battery 2. Therefore, the size and size of the entire battery module 1 can be reduced.
Moreover, since the contact area of the bus bar connecting portion 46 with the positive electrode terminal tab 30 and the negative electrode terminal tab 31 can be minimized, the reduction in volume energy density can be prevented.

  In addition, since the bus bar connecting portion 46 can be connected to the positive electrode terminal tab 30 and the negative electrode terminal tab 31 by a simple operation of bending the bus bar main body 45 along the weakening line 50, the positive electrode can be connected. When connecting the positive electrode bus bar 40 and the negative electrode bus bar 41 to the terminal tab 30 and the negative electrode terminal tab 31, components other than the positive electrode bus bar 40 and the negative electrode bus bar 41 are unnecessary. Therefore, the number of parts can be reduced, and the configuration can be simplified.

  Furthermore, since the bus bar main body 45 is configured to be bent along the weakening line 50, the positive electrode bus bar 40 and the negative electrode bus bar 41 for each positive electrode terminal tab 30 and each negative electrode terminal tab 31 before bending the bus bar main body 45. It can do connection work.

In this case, for example, at the stage before the positive electrode bus bar 40 and the negative electrode bus bar 41 are completely bent, as shown in FIGS. 8 and 9, the plurality of lithium ion secondary batteries 2 are arranged vertically shifted. deep. Thereby, each positive electrode terminal tab 30 and each negative electrode terminal tab 31 are disposed at a position vertically offset with respect to the positive electrode terminal tab 30 and the negative electrode terminal tab 31 adjacent in the first direction L1.
In the present embodiment, although the case where the plurality of lithium ion secondary batteries 2 are shifted up and down is described as an example, the present invention is not limited to this case. For example, a plurality of lithium ion secondary batteries It may be shifted in a state in which 2 is twisted along the plane direction.

Then, after arranging each positive electrode terminal tab 30 and each negative electrode terminal tab 31 at a position shifted up and down with respect to the positive electrode terminal tab 30 and the negative electrode terminal tab 31 adjacent in the first direction L1 as described above, The bus bar connecting portions 46 of the negative electrode bus bar 41 and the positive electrode terminal tabs 30 and the negative electrode terminal tabs 31 are mechanically and electrically connected by welding (for example, spot welding) or the like.
At this time, as described above, the positive electrode terminal tabs 30 and the negative electrode terminal tabs 31 are arranged at positions shifted vertically with respect to the positive electrode terminal tab 30 and the negative electrode terminal tab 31 adjacent in the first direction L1, For example, the connection work by welding etc. can be performed reliably, fully securing work space required for connection work.

  Then, after connecting each positive electrode terminal tab 30 and each negative electrode terminal tab 31 to each bus bar connecting portion 46, bending the bus bar main portion 45 of the positive electrode bus bar 40 and the negative electrode bus bar 41 along the weakening line 50 A plurality of lithium ion secondary batteries 2 are arranged in parallel in the first direction L1. Thereby, as shown in FIGS. 1 to 3, using the positive electrode bus bar 40 and the negative electrode bus bar 41, the plurality of lithium ion secondary batteries 2 arranged in parallel in the first direction L1 are electrically connected in parallel. be able to.

  As described above, since the positive bus bar 40 and the negative bus bar 41 can be connected to the respective positive electrode terminal tabs 30 and the respective negative electrode terminal tabs 31 before the positive electrode bus bar 40 and the negative electrode bus bar 41 are completely bent, Connection work can be easily performed. Therefore, as a result, the battery module 1 having excellent assembly workability can be obtained.

  As described above, according to the battery module 1 of the present embodiment, downsizing and downsizing can be achieved with a simple configuration, and the positive electrode terminal tab 30 and the negative electrode terminal tab 31 of the lithium ion secondary battery 2 can be manufactured. The connection work of the bus bar 3 (the positive electrode bus bar 40 and the negative electrode bus bar 41) can be easily performed while preventing the volume energy density from decreasing.

  In addition, since the weakening line 50 is formed by a thin line, the bus bar main body 45 can be bent accurately along the weakening line 50, and the bus bar main body 45 can be easily bent without requiring an excessive stress. It is possible. Therefore, the battery module 1 can be made excellent in assembling workability.

  In particular, in the positive electrode bus bar 40 and the negative electrode bus bar 41, the weakening lines 50 are formed in the bus bar main body 45 connecting the plurality of bus bar connecting portions 46 with each other. Therefore, when the bus bar main body 45 is bent along the weakening line 50, it is easy to suppress the transfer of the stress caused by the bending to the bus bar connecting portion 46. Therefore, stress caused by the bending of the bus bar main body 45 hardly acts on the connection portion between each positive electrode terminal tab 30 and each negative electrode terminal tab 31 and the bus bar connecting portion 46, and each positive electrode terminal tab 30 and each negative electrode terminal tab 31 The connection state with the bus bar connecting portion 46 can be stably maintained. Thereby, for example, welding peeling and the like can be effectively prevented, and a high quality storage module can be obtained.

Second Embodiment
Next, a second embodiment of the present invention will be described with reference to the drawings.
In the second embodiment, the same parts as those in the first embodiment are indicated by the same reference numerals and the description thereof is omitted.

As shown in FIG. 10, the weakening line 61 of the battery module 60 of this embodiment is different from that of the first embodiment. The weakening line 61 of the present embodiment bulges in a convex shape toward the bending direction of the bus bar main body 45 in the positive electrode bus bar 40 and the negative electrode bus bar 41, and a cross section in which concave streaks 62 are formed on the opposite side to the bending direction. It is formed by a visual arc-shaped broken line (break line).
The battery module 60 of the present embodiment is mainly different from the first embodiment in the points described above, and the other configuration is the same as that of the first embodiment.

The weakening line 61 in this case is formed corresponding to valley folding and mountain folding in the bus bar main body 45. For example, in FIG. 10, the upper end of the vertical wall 45a and the upper end of the inclined wall 45b are folded in a mountain fold along the weakening line 61, so the upper end of the vertical wall 45a and the upper end of the inclined wall 45b The weakening line 61 located at the connecting portion with the lower part is formed by a broken line so that the ridge 62 bulges downward and the streak 62 points upward.
Further, for example, in FIG. 10, the lower end portion of the vertical wall portion 45a and the lower end portion of the inclined wall portion 45b are folded in valley along the weakening line 61, so that the lower end portion of the vertical wall portion 45a and the inclined wall portion 45b The weakening line 61 located at the connecting portion with the lower end portion is formed by a broken line so that the ridge 62 bulges upward and the streak 62 points downward.

  In the bus bar 3 (the positive electrode bus bar 40 and the negative electrode bus bar 41) of the present embodiment, as shown in FIG. 11, it is possible to form the weakening line 61 precisely at a desired position by, for example, pressing.

(Function of battery module)
According to the battery module 60 of the present embodiment configured as described above, the same effects as those of the first embodiment can be achieved.
In addition, as shown in FIG. 10, since the weakening line 61 is formed by a broken line, the bending direction of the bus bar main body 45 can be guided by the weakening line 61. That is, the bus bar main body 45 can be guided so as to bend toward the opposite side to the streak 62. Therefore, the positive electrode bus bar 40 and the negative electrode bus bar 41 can be appropriately bent in the intended direction, and mountain folding and valley folding can be reliably performed at appropriate positions. Therefore, the battery module 60 can be made more excellent in assembly workability.

Third Embodiment
Next, a third embodiment of the present invention will be described with reference to the drawings.
In the third embodiment, the same parts as those in the first embodiment are indicated by the same reference numerals and the description thereof is omitted.

As shown in FIG. 12, in the battery module 70 of the present embodiment, the weakening line 71 is different from that of the first embodiment. The weakening line 71 of the present embodiment is formed in a perforation shape in which a plurality of small through holes 72 penetrating the bus bar main body 45 in the thickness direction are spaced apart in a row.
The battery module 70 of the present embodiment is different from the first embodiment only in the points described above, and the other configuration is the same as that of the first embodiment.

In the bus bar 3 (positive bus bar 40 and negative bus bar 41) of the present embodiment, as shown in FIG. 13, the through holes 72 can be formed precisely at desired positions by, for example, press processing or laser processing. It is possible to form the line 71 with high accuracy.
In the illustrated example, the weakening line 71 is formed by the six through holes 72 having a circular shape in a plan view, but the shape and the number of the through holes 72 are not limited to this case, and may be changed as appropriate. .

(Function of battery module)
According to the battery module 70 of the present embodiment configured as described above, the same effects as those of the first embodiment can be achieved.
In addition to that, as shown in FIG. 12, since the weakening line 71 is formed in a perforation shape in which a plurality of through holes 72 are arranged in a line, bending the bus bar main body 45 precisely along the weakening line 71 As a result, the bus bar main body 45 can be easily bent without requiring excessive stress. Therefore, the battery module 70 can be further improved in assembly workability.

Fourth Embodiment
Next, a fourth embodiment of the present invention will be described with reference to the drawings.
In the fourth embodiment, the same parts as those in the first embodiment are indicated by the same reference numerals and the description thereof is omitted.

As shown in FIG. 14, in the battery module 80 of the present embodiment, when an overcurrent exceeding the specified value flows through the bus bar main body 45 and the bus bar connecting portion 46, the bus bar main portion 45 and the bus bar connecting portion 46 It connects via the fuse (electric current interruption member) 81 which interrupts | blocks the electrical connection between them.
Note that the current blocking member is not limited to the fuse 81.

(Function of battery module)
According to the battery module 80 of the present embodiment configured as described above, the same effects as those of the first embodiment can be achieved.
In addition to that, for example, when the lithium ion secondary battery 2 is short circuited due to any cause, an overcurrent caused by the short circuit is generated from the lithium ion secondary battery 2 from the positive electrode terminal tab 30, the negative electrode terminal tab 31 and the bus bar connection portion The fuse 81 can be used to prevent the flow to the side of the bus bar main body 45 through 46. Therefore, the overcurrent from the shorted lithium ion secondary battery 2 can be prevented from flowing to the other lithium ion secondary battery 2 via the positive electrode bus bar 40 and the negative electrode bus bar 41.

  Therefore, the safety of the battery module 80 can be enhanced, and a higher quality battery module 80 with improved operational reliability can be obtained.

Fifth Embodiment
Next, a fifth embodiment of the present invention will be described with reference to the drawings.
In the fifth embodiment, the same parts as those in the first embodiment are indicated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 15, the battery pack (the storage pack according to the present invention) 90 of the present embodiment is an external that electrically connects the three battery modules 1 in the first embodiment, the three battery modules 1 and the outside. And a connection circuit 91.
The number of battery modules 1 is not limited to three, and may be one or two or four or more.

The external connection circuit 91 includes an external connection terminal 92, and an external connection wiring 93 electrically connecting the external connection terminal 92 and the bus bar 3 of each battery module 1.
The external connection terminal 92 includes a positive electrode connection terminal 92a and a negative electrode connection terminal 92b. The external connection wiring 93 electrically connects the positive electrode bus bars 40 of the respective battery modules 1 in series and also connects the positive electrode connection wiring 93 a electrically connected to the positive electrode connection terminal 92 a, and the negative electrode bus bars 41 of the respective battery modules 1. Are connected in series and a negative electrode connection wiring 93 b electrically connected to the negative electrode connection terminal 92 b.
The positive electrode connection wiring 93 a is electrically connected to the first connection terminal portion 47 in each positive electrode bus bar 40. The negative electrode connection wiring 93 b is electrically connected to the second connection terminal portion 48 in each negative electrode bus bar 41.

Furthermore, the external connection circuit 91 includes a protective circuit 94 electrically connected to the positive electrode connection wiring 93 a and the external connection wiring 93.
The protection circuit 94 protects each battery module 1 from, for example, overcharging and overdischarging, and includes, for example, a control IC (not shown) and a temperature sensor for measuring the temperature of each lithium ion secondary battery 2. . The control IC adjusts, for example, the current flowing to each lithium ion secondary battery 2 and can control the voltage of each lithium ion secondary battery 2 to be constant.
For example, in each battery module 1, the protection circuit 94 forcibly shuts off the charging current when the battery voltage exceeds a specified value during charging, and discharges when the battery voltage reaches less than the specified value during discharging. Force the current to shut off.

(Function of battery pack)
According to the battery pack 90 of the present embodiment, power from the plurality of battery modules 1 can be supplied to an external device via the external connection terminal 92. In particular, as described above, since the battery module 1 capable of achieving downsizing and downsizing with a simple configuration is provided, the battery pack 90 itself can be miniaturized and compacted, and the handling property is improved. For example, it becomes possible to use suitably for various devices.

  While the embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. Each embodiment can be implemented in other various forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. In addition, each embodiment includes, for example, those which can be easily conceived by those skilled in the art, those substantially the same, and the equivalent ranges.

  For example, in each of the above-described embodiments, each lithium ion secondary battery 2 includes only one stacked electrode 11. However, the present invention is not limited to this case, and a plurality of stacked electrodes 11 are provided. Alternatively, the lithium ion secondary battery 2 may be stacked.

Moreover, in said each embodiment, although several lithium ion secondary battery 2 comrades were electrically connected in parallel via the bus-bar 3 (positive electrode bus-bar 40 and negative electrode bus-bar 41), what is limited in this case Absent.
For example, in the relationship between the lithium ion secondary battery 2 adjacent in the first direction L1, the positive electrode terminal tab 30 of one lithium ion secondary battery 2 and the negative electrode terminal tab 31 of the other lithium ion secondary battery 2 The lithium ion secondary batteries 2 may be arranged in parallel in the first direction L1 so as to face the one direction L1. And, even if the positive electrode terminal tab 30 of one lithium ion secondary battery 2 and the negative electrode terminal tab 31 of the other lithium ion secondary battery 2 are electrically connected in series via the bus bar 3 according to the present invention I do not care.
By repeatedly performing such a connection between the plurality of lithium ion secondary batteries 2, the plurality of lithium ion secondary batteries 2 can be electrically connected in series via the bus bar 3. Even in this case, for example, the same operation and effect as those of the first embodiment can be achieved only by changing the electrical connection method.

In each of the above-described embodiments, the non-aqueous electrolytic solution has been described as an example of the electrolyte of the lithium ion secondary battery 2. However, the present invention is not limited to this case. For example, a polymer electrolyte or gel electrolyte may be used as the electrolyte.
As the polymer electrolyte, for example, one containing a lithium salt and a polymer can be used. The polymer is not particularly limited as long as it can be gelled, and is not particularly limited. For example, polyethylene oxide, polyproprene oxide, polyacrylonitrile, polyvinylidene fluoride (PVDF), polyurethane, polyacrylate, cellulose Etc.

Furthermore, a solid electrolyte may be used as the electrolyte.
In this case, for example, a ceramic paper, which is a sintered body obtained by sintering a fibrous body of alumina or titania, contains an inorganic solid electrolyte (eg, Li ₂ S, SiS ₂ , Li ₄ SiO ₄ ). Instead of the separator 22, it can be used as a separating member. Even in this case, for example, lithium ions can be moved between the positive electrode 20 and the negative electrode 21 through the solid electrolyte, so that a reliable electrochemical reaction can be performed.

Furthermore, in each of the above embodiments, the lithium ion secondary battery 2 is described as an example of the storage cell, but the present invention is not limited to this case. For example, anions and cations move to the positive electrode 20 side and the negative electrode 21 side respectively through the electrolyte, and are adsorbed while forming an electric double layer at the time of charge, and are desorbed by making the electric double layer disappear at the time of discharge. It may be an electric double layer capacitor (for example, lithium ion capacitor) which performs charge and discharge by accumulation and discharge.
In the case of the electric double layer capacitor, for example, the charge can be stored only by the physical adsorption of ions without a reaction involving oxidation and reduction, and stable charge and discharge can be performed.

L1 ... first direction (one direction)
1, 60, 70, 80 ... battery module (storage module)
2 ... Lithium ion secondary battery (storage cell)
3 ... bus bar 10 ... exterior body 11 ... stacked electrode (storage element)
12 terminal tab 45 bus bar main body portion 46 bus bar connecting portion 50, 61, 71 weakening line 62 streak 72 through hole 81 fuse (current blocking member)
90 ... battery pack (storage battery pack)
91 External connection circuit 92 External connection terminal 93 External connection wiring

Claims (7)

A chargeable / dischargeable storage element housed in an outer package formed of a laminate film, and a plurality of storage cells connected to the storage element and having terminal tabs partially projecting to the outside of the outer package;
And a bus bar electrically connected to the terminal tab and electrically connecting the plurality of storage cells to each other,
The plurality of storage cells are arranged in parallel such that the terminal tabs are arranged in one direction with the terminal tabs facing each other,
A foldable weakening line is formed on the bus bar in correspondence with the terminal tab,
The power storage module, wherein the bus bar is connected to the terminal tab in a state where a part of the bus bar is arranged to face the terminal tab by bending along the weakening line. In the storage module of claim 1,
The storage module, wherein the weakening line is formed by a thin-walled line that is thinner than other portions of the bus bar excluding the weakening line. In the storage module of claim 1,
The electric storage module, wherein the weakening line bulges in a convex shape toward the bending direction of the bus bar, and a concave streak is formed on the opposite side to the bending direction. In the storage module of claim 1,
A storage module, wherein the weakening lines are formed by arranging a plurality of through holes penetrating the bus bar in a thickness direction at intervals. The storage module according to any one of claims 1 to 4.
The bus bar is
A bus bar main body disposed along the one direction;
And a plurality of bus bar connection portions connected to the bus bar main body portion and formed corresponding to the terminal tabs,
The weakening line is formed in the bus bar main body portion.
A plurality of the bus bar connecting portions are connected in a state in which the plurality of bus bar connecting portions are arranged to face the terminal tabs by bending the bus bar main body along the weakening line. In the storage module according to claim 5,
The bus bar main body portion and the bus bar connecting portion are connected via a current blocking member that cuts off an electrical connection between the bus bar main portion and the bus bar connecting portion when an overcurrent exceeding a prescribed value flows. The storage module has been. The storage module according to any one of claims 1 to 6;
A storage pack comprising: an external connection circuit; and an external connection circuit having an external connection wiring electrically connecting the external connection terminal and the bus bar.

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