JP2017084469A - Battery pack and spacer for battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low cost spacer for an assembled battery, in which a mounting member can be attached to a side surface of a unit cell along a stacking direction. SOLUTION: The stacked body in which flat cells having a flat shape are stacked and the cells are electrically connected to each other, and the stacked body are arranged between adjacent single cells in the stacking direction of the single cells, and stacked in the stacking direction. And a mounting member attached to the spacer. The spacer has a first opening 121P that is open to one end face 121a of both end faces extending in a direction intersecting the stacking direction Z of the spacer, and another end face 121b of both end faces from the first opening 121P. The spacer is stacked in the stacking direction Z, and includes a recess 121Q that is formed to be recessed toward the recess 121 and a second opening 121R that communicates with the recess 121Q and that opens to a side surface 121t along the stacking direction Z of the spacer. As a result, the assembled battery in which the guide hole for mounting the mounting member is formed by the other end surface 121b and the second opening 121R of the spacer. [Selection diagram] Fig. 12

Description

  The present invention relates to an assembled battery in which a plurality of unit cells are stacked and a spacer for the assembled battery.

  Conventionally, there is an assembled battery in which a plurality of unit cells are stacked (see Patent Document 1). An assembled battery has a spacer arrange | positioned between the adjacent single cells in the lamination direction of a single cell.

  In the above-described assembled battery, there is a demand for attaching a mounting member such as a bus bar holder that holds a bus bar that electrically connects the cells to a side surface of the spacer along the stacking direction of the cells. As a method for attaching the mounting member to the side surface along the stacking direction of the spacer, there are a method of insert molding a mounting nut or the like and a method of forming an opening on the side surface. As a method of forming the opening, there are a method of forming the opening after forming the spacer and a method of forming the opening together when forming the spacer.

Special table 2013-524406 gazette

  However, the method of insert-molding a mounting nut or the like has a problem that the manufacturing cost is high. Further, the method of forming the opening after molding the spacer also increases the manufacturing cost because an additional processing step occurs. In order to form the spacer at a low cost, it is preferable to form the spacer using a mold. However, when forming a spacer using a mold, if the opening is also formed together, the opening becomes undercut, which increases the cost of the mold and lowers the manufacturing cost. The problem that it is not possible arises.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an assembled battery in which a plurality of unit cells are stacked via a spacer, an assembled battery in which a mounting member can be attached to a side surface along the stacking direction of the unit cells in the spacer, and a spacer for the assembled battery. It is to provide at low cost.

  In order to achieve the above object, an assembled battery of the present invention includes a stacked body in which a plurality of flat cells are stacked in the thickness direction and the cells are electrically connected to each other, and the stacking direction of the cells And a spacer which is disposed between adjacent unit cells and is stacked in the stacking direction, and a mounting member attached to the spacer. The spacer has a first opening that opens at one end face among both end faces that extend in a direction intersecting the stacking direction of the spacer, and is recessed from the first opening toward the other end face of the both end faces. A recess formed; and a second opening that communicates with the recess and opens to a side surface along the stacking direction of the spacer. The first opening and the second opening are continuously formed from one end surface to the side surface. Then, by stacking the spacers in the stacking direction, the first opening of the one spacer is closed by the other end surface of the other spacer disposed adjacent to the one spacer in the stacking direction, and the A guide hole to which the mounting member is attached is formed by the other end surface and the second opening of the one spacer.

  The spacer for an assembled battery of the present invention for achieving the above object is disposed between adjacent unit cells in the stacking direction of the unit cells among the unit cells having a flat shape and stacked in the thickness direction, It is the assembled battery spacer to which the mounting member is attached while being stacked along the stacking direction. The spacer according to the present embodiment includes a first opening that opens to one end face among both end faces that extend in a direction intersecting the stacking direction of the spacer, and the other end face from the first opening to both end faces. And a second opening that communicates with the recess and opens on a side surface along the stacking direction of the spacer. The first opening and the second opening are continuously formed from one end surface to the side surface. Then, by stacking the spacers in the stacking direction, the first opening of the one spacer is closed by the other end surface of the other spacer disposed adjacent to the one spacer in the stacking direction, and the A guide hole to which the mounting member is attached is formed by the second opening of one spacer and the other end surface.

  According to the assembled battery and the assembled battery spacer according to the present invention, the guide hole in which the mounting member is attached to the side surface along the stacking direction of the spacer can be formed by a simple method of stacking the spacer in the stacking direction. Therefore, the guide hole to which the mounting member is attached can be formed at a lower cost than the method of insert molding a mounting nut or the like. Accordingly, in an assembled battery in which a plurality of unit cells are stacked via a spacer, an assembled battery in which a mounting member can be attached to a side surface along the stacking direction of the unit cells in the spacer and a spacer for the assembled battery are provided at low cost. it can.

It is a perspective view which shows the assembled battery which concerns on embodiment. It is a perspective view which shows the state which exposed the whole laminated body of the state which decomposed | disassembled the upper pressure plate, the lower pressure plate, and the left and right side plates from the assembled battery shown in FIG. It is a perspective view which removes a protective cover from the laminated body shown by FIG. 2, and decomposes | disassembles a laminated body into a battery group and a bus bar unit. It is a perspective view which decomposes | disassembles and shows the bus bar unit shown by FIG. The state of joining the anode side electrode tabs of the first cell sub-assemblies (single cells connected in parallel every three sets) and the cathode side electrode tabs of the second cell sub-assies (unit cells connected in parallel every three sets) with a bus bar is schematically disassembled. It is a perspective view shown. 6A is a perspective view showing a state in which a pair of spacers (first spacer and second spacer) is attached to a single cell, and FIG. 6B is a pair of spacers (first spacer and first spacer). It is a perspective view which shows the state before attaching 2 spacers. It is a perspective view which shows a pair of spacer (1st spacer and 2nd spacer). FIG. 8A is a perspective view showing a cross section of a main part in a state in which a bus bar is joined to the electrode tabs of the stacked unit cells, and FIG. 8B is a side view showing FIG. 8A from the side. is there. It is the side view to which the area | region 9 shown in FIG. 8 (B) was expanded. FIG. 10A is a perspective view showing the main part when the bus bar holder is attached to the first spacer, and FIG. 10B is a perspective view showing the main part when the terminal holder is attached to the first spacer. . FIG. 11 (A) is a front view of the first spacers stacked in a state of being attached to the unit cell, and FIG. 11 (B) is a plan view of the first spacers. FIG. 12A is a perspective view showing a main part near the end of the first spacer when the first spacer attached to the unit cell is stacked, and FIG. 12B is a stack of the first spacer. It is a perspective view which shows the principal part of the edge part vicinity of the 1st spacer of the state which was made. FIG. 13A is a perspective view showing a main part near the center of the first spacer when the first spacer attached to the unit cell is stacked, and FIG. 13B is a stack of the first spacer. It is a perspective view which shows the principal part of the center part vicinity of the 1st spacer of the state of having been made. 14A is an enlarged view of the region 14A shown in FIG. 11B, and FIG. 14B is a diagram showing a state in which the engaging claw of the bus bar holder is engaged with the rib provided in the first guide hole. It is an enlarged view corresponding to 14 (A). FIG. 15A is an enlarged view of the region 15A shown in FIG. 11B, and FIG. 15B is a view showing a state in which the engaging claw of the bus bar holder is engaged with the rib provided in the second guide hole. It is an enlarged view corresponding to 15 (A). 16A is a perspective view of the bus bar holder, FIG. 16B is a plan view of the bus bar holder, and FIG. 16C is an enlarged view of a region 16C shown in FIG. 16A. 17A is a perspective view of the terminal holder with the anode-side terminal and the cathode-side terminal attached thereto, FIG. 17B is a plan view of the terminal holder, and FIG. 17C is FIG. It is sectional drawing which follows the 17C-17C line of A). 18A is an enlarged view of the region 18A shown in FIG. 11A, and FIG. 18B is an enlarged view of the region 18B shown in FIG. 11A. FIG. 19A is a perspective view showing a main part when a rib included in the bus bar holder is inserted into the third opening of the first spacer, and FIG. 19B shows that the rib is inserted into the third opening. It is an end elevation which follows the 19B-19B line | wire of FIG. 11 (A) at the time of doing. It is a figure which shows the manufacturing method of the assembled battery which concerns on embodiment, Comprising: It is a perspective view which shows typically the state which has laminated | stacked the member which comprises an assembled battery in order with respect to the mounting base. FIG. 21 is a perspective view schematically showing a state in which the constituent members of the assembled battery are pressed from above, following FIG. 20. FIG. 22 is a perspective view schematically showing a state in which the side plate is laser-welded to the upper pressure plate and the lower pressure plate, following FIG. 21. FIG. 23 is a perspective view schematically showing a state where a part of the members of the bus bar unit is attached to the battery group, following FIG. 22. FIG. 24 is a perspective view schematically showing a state in which the bus bar of the bus bar unit is laser-welded to the electrode tab of the unit cell, following FIG. 23. It is a side view which shows the principal part of the state which has laser-joined the bus bar to the electrode tab of the laminated | stacked single battery in a cross section. FIG. 26 is a perspective view schematically illustrating a state where the anode side terminal and the cathode side terminal are laser-welded to the anode side bus bar and the cathode side bus bar, following FIG. 24 and FIG. 25. FIG. 27 is a perspective view schematically showing a state where the protective cover is attached to the bus bar unit, following FIG. 26. 28A is an enlarged view of a cross section corresponding to a cross section taken along line 28A-28A in FIG. 11A in a state where the bus bar holder is attached to the first spacer according to the modified example, and FIG. It is an enlarged view corresponding to Drawing 16 (C) of a bus bar holder concerning a modification.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. The size and ratio of each member in the drawings are exaggerated for convenience of explanation and may be different from the actual size and ratio. In the figure, the azimuth is shown using arrows represented by X, Y, and Z. The direction of the arrow represented by X indicates a direction that intersects the stacking direction of the unit cells 110 and is along the longitudinal direction of the unit cells 110. The direction of the arrow represented by Y indicates a direction that intersects the stacking direction of the unit cells 110 and is along the short direction of the unit cells 110. The direction of the arrow represented by Z indicates the stacking direction of the unit cells 110.

  The direction of the arrow represented by Y also indicates the width direction of the electrode tab 113. In this specification, the width direction of the electrode tab 113 includes a direction (corresponding to the longitudinal direction X of the unit cell 110) from the base end portion 113c side to the tip end portion 113d side and the stacking direction Z. It means the direction of crossing.

(Embodiment)
First, the assembled battery 100 of this embodiment is demonstrated, referring FIGS.

  FIG. 1 is a perspective view showing an assembled battery 100 according to the present embodiment. FIG. 2 shows a state in which the entire pressurization plate 151, lower pressurization plate 152, and left and right side plates 153 are disassembled from the assembled battery 100 shown in FIG. It is a perspective view. FIG. 3 is a perspective view in which the protective cover 140 is removed from the laminated body 100S shown in FIG. 2 and the laminated body 100S is disassembled into the battery group 100G and the bus bar unit 130. 4 is an exploded perspective view showing the bus bar unit 130 shown in FIG. FIG. 5 shows the anode side electrode tab 113A of the first cell sub-assembly 100M (unit cells 110 connected in parallel every three sets) and the cathode side electrode tab 113K of the second cell sub-assembly 100N (unit cells 110 connected in parallel every three sets). It is a perspective view which decomposes | disassembles and shows the state joined by the bus bar 131 typically. 6A is a perspective view showing a state where a pair of spacers 120 (first spacer 121 and second spacer 122) are attached to the unit cell 110, and FIG. 6B is a pair of spacers 120 attached to the unit cell 110. FIG. It is a perspective view which shows the state before attaching (the 1st spacer 121 and the 2nd spacer 122). FIG. 7 is a perspective view showing a pair of spacers 120 (first spacer 121 and second spacer 122). FIG. 8A is a perspective view showing a cross-sectional view of the main part in a state where the bus bar 131 is joined to the electrode tab 113 of the stacked unit cell 110, and FIG. 8B shows FIG. 8A from the side. It is a side view. FIG. 9 is an enlarged side view of the region 9 shown in FIG. 10A is a perspective view showing a main part when the bus bar holder 132 is attached to the first spacer 121, and FIG. 10B is a perspective view showing a main part when the terminal holder 135 is attached to the first spacer 121. FIG. It is. FIG. 11A is a front view of the first spacers 121 stacked in a state of being attached to the unit cell 110, and FIG. 11B is a plan view of the first spacers 121. FIG. 12A is a perspective view showing a main part near the end 121W1 of the first spacer 121 when the first spacer 121 attached to the unit cell 110 is stacked, and FIG. It is a perspective view which shows the principal part of the edge part 121W1 vicinity of the said 1st spacer 121 of the state in which the 1 spacer 121 was laminated | stacked. FIG. 13A is a perspective view showing a main part near the central portion 121W2 of the first spacer 121 when the first spacer 121 attached to the unit cell 110 is stacked, and FIG. It is a perspective view which shows the principal part of the center part 121W2 vicinity of the said 1st spacer 121 of the state in which the 1 spacer 121 was laminated | stacked. 14A is an enlarged view of the region 14A shown in FIG. 11B, and FIG. 14B is an engagement claw 180 of the bus bar holder 132 engaged with the rib 121y provided in the first guide hole 121U1. It is an enlarged view corresponding to FIG. 14 (A) which shows a mode. FIG. 15A is an enlarged view of the region 15A shown in FIG. 11B, and FIG. 15B is an engagement claw 180 of the bus bar holder 132 engaged with the rib 121y provided in the second guide hole 121U2. It is an enlarged view corresponding to FIG. 15 (A) which shows a mode. 16A is a perspective view of the bus bar holder 132, FIG. 16B is a plan view of the bus bar holder 132, and FIG. 16C is an enlarged view of a region 16C shown in FIG. 16A. . FIG. 17A is a perspective view of the terminal holder 135 with the anode side terminal 133 (cathode side terminal 134) attached thereto, FIG. 17B is a plan view of the terminal holder 135, and FIG. These are sectional drawings which follow the 17C-17C line of Drawing 17 (A). 18A is an enlarged view of the region 18A shown in FIG. 11A, and FIG. 18B is an enlarged view of the region 18B shown in FIG. 11A. FIG. 19A is a perspective view showing a main part when the rib 185 included in the bus bar holder 132 is inserted into the third opening 121Z of the first spacer 121, and FIG. 19B shows the third opening 121Z. It is an end elevation which follows the 19B-19B line | wire of FIG. 11 (A) at the time of inserting the said rib 185 in FIG.

  In the state shown in FIG. 1, the left front side is referred to as the entire assembled battery 100 and the “front side” of each component, and the right rear side is referred to as the entire assembled battery 100 and the “rear side” of each component. The right front side and the left hand back side are referred to as the left and right “side sides” of the entire assembled battery 100 and each component.

  As shown in FIG. 1 and FIG. 2, the assembled battery 100 includes a stacked body 100S including a battery group 100G in which a plurality of flat unit cells 110 are stacked in the thickness direction and the unit cells are electrically connected to each other. Have The assembled battery 100 further includes a protective cover 140 that is attached to the front surface side of the stacked body 100S, and a housing 150 that houses the stacked body 100S in a state where each of the single cells 110 is pressurized along the stacking direction of the single cells 110. Have. As illustrated in FIG. 3, the stacked body 100 </ b> S includes a battery group 100 </ b> G and a bus bar unit 130 that is attached to the front side of the battery group 100 </ b> G and integrally holds a plurality of bus bars 131. The protective cover 140 covers and protects the bus bar unit 130. As shown in FIG. 4, the bus bar unit 130 includes a plurality of bus bars 131 and a bus bar holder 132 that integrally attaches the plurality of bus bars 131 in a matrix. Among the plurality of bus bars 131, an anode side terminal 133 is attached to the end on the anode side, and a cathode side terminal 134 is attached to the end on the cathode side. As shown in FIG. 4, the bus bar unit 130 further includes a terminal holder 135 that holds the anode side terminal 133 and the cathode side terminal 134.

  In summary, the assembled battery 100 of the present embodiment includes a stacked body 100S in which a plurality of flat unit cells 110 are stacked in the thickness direction and the unit cells 110 are electrically connected to each other, and the unit cell 110. The first spacer 121 is disposed between the adjacent unit cells 110 in the stacking direction Z and stacked in the stacking direction Z, and the mounting member 170 is attached to the first spacer 121. The first spacer 121 includes a first opening 121P that opens in one end surface 121a out of both end surfaces 121a and 121b that extend in a direction intersecting the stacking direction Z of the first spacer 121, and the first opening 121P. A recess 121Q that is recessed toward the other end surface 121b of the both end surfaces 121a and 121b, and a second hole that communicates with the recess 121Q and opens to the side surface 121t along the stacking direction Z of the first spacer 121. And an opening 121R. The first opening 121P and the second opening 121R are continuously formed from one end surface 121a to the side surface 121t. Then, the first spacer 121 is stacked in the stacking direction Z, so that the first opening 121P of the first spacer 121 is disposed adjacent to the first spacer 121 in the stacking direction Z. A guide hole 121U to which the mounting member 170 is attached is formed by the other end surface 121b of the first spacer 121 and the other end surface 121b and the second opening 121R of the first spacer 121. . In this embodiment, the assembled battery 100 will be described by taking the case where the mounting member 170 is a bus bar holder 132 and a terminal holder 135 as an example. Hereinafter, the assembled battery 100 of this embodiment will be described in detail.

  As shown in FIG. 5, the battery group 100G includes a first cell sub-assembly 100M composed of three unit cells 110 electrically connected in parallel and a second cell sub-assembly 100N composed of three other unit cells 110 electrically connected in parallel. Are connected in series by a bus bar 131.

  The first cell sub-assembly 100M and the second cell sub-assembly 100N have the same configuration except for the refractive direction of the tip 113d of the electrode tab 113 of the unit cell 110. Specifically, the second cell sub-assembly 100N is obtained by reversing the top and bottom of the unit cell 110 included in the first cell sub-assembly 100M. However, the refraction direction of the tip portion 113d of the electrode tab 113 of the second cell sub-assembly 100N is aligned with the lower side of the stacking direction Z so as to be the same as the refraction direction of the tip portion 113d of the electrode tab 113 of the first cell sub-assembly 100M. ing. Each unit cell 110 has a pair of spacers 120 (first spacer 121 and second spacer 122) attached thereto.

  The unit cell 110 corresponds to, for example, a flat lithium ion secondary battery. As shown in FIGS. 6 and 8, the unit cell 110 includes a battery body 110H in which the power generation element 111 is sealed with a pair of laminate films 112, and is electrically connected to the power generation element 111 and led out from the battery body 110H. And a thin plate-like electrode tab 113.

  The power generation element 111 is formed by laminating a plurality of layers in which a positive electrode and a negative electrode are sandwiched by separators. The power generation element 111 is supplied with electric power from the outside and charged, and then supplies electric power while discharging to an external electric device.

  The laminate film 112 is configured to cover both sides of the metal foil with an insulating sheet. The pair of laminate films 112 cover the power generation element 111 from both sides along the stacking direction Z and seal the four sides. As shown in FIG. 6, the pair of laminate films 112 lead out the anode-side electrode tab 113 </ b> A and the cathode-side electrode tab 113 </ b> K from between the one end 112 a along the short direction Y to the outside.

  As shown in FIGS. 6 and 7, the laminate film 112 has a pair of connection pins 121 i of the first spacer 121 in a pair of connection holes 112 e respectively provided at both ends of the one end 112 a along the short direction Y. It is inserted. On the other hand, the laminate film 112 has a pair of connecting pins 122i inserted through a pair of connecting holes 112e provided at both ends of the other end 112b along the short direction Y, respectively. The laminate film 112 is formed by bending both end portions 112c and 112d along the longitudinal direction X upward in the stacking direction Z. The laminate film 112 may be formed by bending both end portions 112c and 112d along the longitudinal direction X downward in the stacking direction Z.

  As shown in FIGS. 6, 8, and 9, the electrode tab 113 includes an anode-side electrode tab 113 </ b> A and a cathode-side electrode tab 113 </ b> K, and is separated from one end 112 a of each pair of laminate films 112. In the state it extends outward. The anode-side electrode tab 113A is made of aluminum in accordance with the characteristics of the anode-side component member in the power generation element 111. The cathode-side electrode tab 113K is made of copper in accordance with the characteristics of the cathode-side constituent member in the power generation element 111.

  As shown in FIGS. 8 and 9, the electrode tab 113 is formed in an L shape from the base end portion 113c adjacent to the battery body 110H to the tip end portion 113d. Specifically, the electrode tab 113 extends along one side in the longitudinal direction X from the base end portion 113c. On the other hand, the tip 113d of the electrode tab 113 is formed by being refracted along the lower side in the stacking direction Z. The shape of the tip portion 113d of the electrode tab 113 is not limited to the L shape. The tip portion 113 d of the electrode tab 113 is formed in a planar shape so as to face the bus bar 131. The electrode tab 113 may be formed in a U-shape by further extending the distal end portion 113d and folding the extended portion along the base end portion 113c toward the battery body 110H. On the other hand, the base end portion 113c of the electrode tab 113 may be formed in a wave shape or a curved shape.

  The tip portions 113d of the electrode tabs 113 are refracted so as to be aligned downward in the stacking direction Z as shown in FIGS. Here, as shown in FIG. 5, the assembled battery 100 includes three unit cells 110 (first cell sub-assy 100M) electrically connected in parallel and another three unit cells 110 (second cell) connected in parallel. Cell subassemblies 100N) are connected in series. Therefore, for each of the three unit cells 110, the top and bottom of the unit cell 110 are switched so that the positions of the anode side electrode tab 113A and the cathode side electrode tab 113K of the unit cell 110 intersect along the stacking direction Z. Yes.

  However, simply replacing the top and bottom for each of the three unit cells 110 causes the position of the tip 113d of the electrode tab 113 to vary in the vertical direction along the stacking direction Z. The light is adjusted and refracted so that the position of the tip 113d of 113 is aligned.

  In the first cell sub-assembly 100M shown in the lower part of FIG. 5, the anode side electrode tab 113A is arranged on the right side in the figure, and the cathode side electrode tab 113K is arranged on the left side in the figure. On the other hand, in the second cell sub-assembly 100N shown in the upper part of FIG. 5, the cathode side electrode tab 113K is arranged on the right side in the figure, and the anode side electrode tab 113A is arranged on the left side in the figure.

  Thus, even if the arrangement of the anode-side electrode tab 113A and the cathode-side electrode tab 113K is different, the tip 113d of the electrode tab 113 of the unit cell 110 is refracted downward along the stacking direction Z. Further, the tip 113d of each electrode tab 113 is disposed on the same surface side of the laminate 100S as shown in FIG. A double-sided tape 160 that adheres to a laminated member that is laminated above is attached to the unit cells 110 that are positioned on the upper surfaces of the first cell sub-assembly 100M and the second cell sub-assembly 100N.

  The pair of spacers 120 (the first spacer 121 and the second spacer 122) are disposed between the stacked unit cells 110 as shown in FIG. 3, FIG. 5, and FIG. As shown in FIG. 6, the first spacer 121 is disposed along one end 112 a of the laminate film 112 from which the electrode tab 113 of the unit cell 110 is projected. As shown in FIG. 6, the second spacer 122 is disposed along the other end 112 b of the laminate film 112. The second spacer 122 has a configuration in which the shape of the first spacer 121 is simplified. Each cell 110 is stacked with a pair of spacers 120 (first spacer 121 and second spacer 122) and then stacked along the stacking direction Z. The pair of spacers 120 (the first spacer 121 and the second spacer 122) are made of reinforced plastics having insulating properties. Hereinafter, after describing the configuration of the first spacer 121, the configuration of the second spacer 122 will be described in comparison with the configuration of the first spacer 121.

  As shown in FIGS. 6 and 7, the first spacer 121 is formed in a rectangular parallelepiped shape that is long along the short direction Y. The first spacer 121 includes mounting portions 121M and 121N at both ends in the longitudinal direction (short direction Y). Further, the first spacer 121 includes a mounting portion 121L at a position sandwiched between the anode side electrode tab 113A and the cathode side electrode tab 113K when the first spacer 121 is attached to the unit cell 110. (See FIG. 11B).

  The mounting portions 121M, 121N, and 121L include both end surfaces 121a and 121b extending in a direction intersecting the stacking direction Z of the first spacer 121. FIG. 7 illustrates the case where the end surface 121a is disposed above the end surface 121b in the stacking direction Z. In this specification, for convenience, the end surface 121a may be referred to as an upper surface 121a, and the end surface 121b may be referred to as a lower surface 121b.

  As shown in FIG. 8B, when the first spacer 121 is stacked in a state of being attached to the unit cell 110, the first spacer 121 is placed on the upper surfaces 121a of the mounting portions 121M, 121N, and 121L of the first spacer 121, and the one The lower surfaces 121b of the mounting portions 121M, 121N, and 121L of the other first spacers 121 disposed above the first spacer 121 come into contact with each other.

  As shown in FIG. 7 and FIG. 8B, the first spacer 121 is one first spacer 121 in order to perform relative positioning of the unit cells 110 to be stacked in the mounting portions 121M and 121N. A positioning pin 121c provided on the upper surface 121a of the first spacer 121 and a positioning hole 121d corresponding to the position of the positioning pin 121c opened in the lower surface 121b of the other first spacer 121 are fitted.

  As shown in FIG. 7, the first spacer 121 includes a locating hole 121 e along the stacking direction Z for inserting bolts that connect the plurality of assembled batteries 100 connected along the stacking direction Z. Openings to 121M and 121N, respectively.

  As shown in FIGS. 6B and 7, the first spacer 121 is formed such that a region between the placement parts 121 </ b> M and 121 </ b> N is cut out from the upper side in the stacking direction Z. The notched portion includes a first support surface 121g and a second support surface 121h along the longitudinal direction of the first spacer 121 (the short direction Y of the unit cell 110). The first support surface 121g is formed higher in the stacking direction Z than the second support surface 121h, and is positioned on the unit cell 110 side.

  As shown in FIG. 6, the first spacer 121 places and supports one end 112 a of the laminate film 112 from which the electrode tab 113 protrudes by the first support surface 121 g. The first spacer 121 includes a pair of connecting pins 121i protruding upward from both ends of the first support surface 121g.

  As shown in FIGS. 8 and 9, the first spacer 121 is provided with a support portion 121 j that abuts the electrode tab 113 from the side opposite to the bus bar 131 and supports the tip portion 113 d of the electrode tab 113 of the unit cell 110. It is adjacent to the support surface 121h and is provided on the side surface along the stacking direction Z. The support part 121j of the first spacer 121 sandwiches the front end part 113d of the electrode tab 113 together with the bus bar 131 so that the front end part 113d and the bus bar 131 are sufficiently in contact with each other.

  As shown in FIGS. 6 and 7, the second spacer 122 has a configuration in which the shape of the first spacer 121 is simplified. The second spacer 122 corresponds to a configuration in which a part of the first spacer 121 is deleted along the short direction Y of the unit cell 110. Specifically, the second spacer 122 is configured by replacing the second support surface 121h and the first support surface 121g of the first spacer 121 with a support surface 122k. Specifically, the second spacer 122 includes mounting portions 122M and 122N, like the first spacer 121. On the other hand, the mounting portion 121L is deleted from the second spacer 122. The second spacer 122 includes a support surface 122k in a portion where the region between the placement portions 122M and 122N is cut out from the upper side in the stacking direction Z. The support surface 122k places and supports the other end 112b of the laminate film 112. Similar to the first spacer 121, the second spacer 122 includes a positioning pin 122c, a positioning hole, a locating hole 122e, and a connecting pin 122i.

  As shown in FIGS. 3 and 4, the bus bar unit 130 includes a plurality of bus bars 131 integrally. The bus bar 131 is made of a metal having conductivity, and electrically connects the tip end portions 113d of the electrode tabs 113 of different unit cells 110. The bus bar 131 is formed in a flat plate shape and stands along the stacking direction Z.

  The bus bar 131 includes an anode side bus bar 131A laser welded to the anode side electrode tab 113A of one unit cell 110 and a cathode side laser welded to the cathode side electrode tab 113K of another unit cell 110 adjacent along the stacking direction Z. The bus bar 131K is joined and integrally configured.

  As shown in FIGS. 4 and 8, the anode-side bus bar 131A and the cathode-side bus bar 131K have the same shape and are formed in an L shape. The anode-side bus bar 131A and the cathode-side bus bar 131K are superposed with the top and bottom reversed. Specifically, the bus bar 131 joins a refracted portion at one end along the stacking direction Z of the anode-side bus bar 131A and a refracted portion at one end along the stacking direction Z of the cathode-side bus bar 131K. It is integrated. As shown in FIG. 4, the anode-side bus bar 131 </ b> A and the cathode-side bus bar 131 </ b> K include a side portion 131 c along the longitudinal direction X from one end in the short-side direction Y. The side part 131 c is joined to the bus bar holder 132.

  The anode-side bus bar 131A is made of aluminum, like the anode-side electrode tab 113A. Similarly to the cathode side electrode tab 113K, the cathode side bus bar 131K is made of copper. The anode side bus bar 131A and the cathode side bus bar 131K made of different metals are joined to each other by ultrasonic joining.

  As shown in FIG. 5, when the battery pack 100 is configured by connecting a plurality of battery cells 110 connected in parallel across a plurality of sets, for example, the battery pack 100 includes a portion of the anode-side bus bar 131A. Laser welding is performed on the anode-side electrode tabs 113A of the three unit cells 110 adjacent to each other along the stacking direction Z. Similarly, the bus bar 131 laser-welds a portion of the cathode-side bus bar 131K to the cathode-side electrode tabs 113K of the three unit cells 110 adjacent to each other along the stacking direction Z.

  However, among the bus bars 131 arranged in a matrix, the bus bar 131 located at the upper right in the drawings of FIGS. 3 and 4 corresponds to the anode-side end of the 21 unit cells 110 (3 parallel 7 series). It consists only of the side bus bar 131A. This anode-side bus bar 131A is laser-bonded to the anode-side electrode tab 113A of the uppermost three unit cells 110 of the battery group 100G. Similarly, among the bus bars 131 arranged in a matrix, the bus bar 131 located at the lower left in the drawings of FIGS. 3 and 4 corresponds to the end of the cathode side of 21 unit cells 110 (3 parallel 7 series), It consists only of the cathode side bus bar 131K. The cathode side bus bar 131K is laser-bonded to the cathode side electrode tabs 113K of the three unit cells 110 at the bottom of the battery group 100G.

  As shown in FIG. 3, the bus bar holder 132 integrally holds a plurality of bus bars 131 in a matrix shape so as to face the electrode tabs 113 of each unit cell 110 that is stacked. The bus bar holder 132 is made of an insulating resin and has a frame shape.

  As shown in FIG. 4, the bus bar holder 132 is a pair of standing up along the stacking direction Z so as to be positioned on both sides in the longitudinal direction of the first spacer 121 that supports the electrode tab 113 of the unit cell 110. Each column portion 132a is provided. The pair of support columns 132a are fitted to the side surfaces of the mounting portions 121M and 121N of the first spacer 121. The pair of struts 132a are L-shaped when viewed along the stacking direction Z, and are formed in a plate shape extending along the stacking direction Z. The bus bar holder 132 is provided with a pair of auxiliary struts 132 b that are erected along the stacking direction Z so as to be located near the center of the first spacer 121 in the longitudinal direction. The pair of auxiliary struts 132b are formed in a plate shape extending along the stacking direction Z.

  As shown in FIG. 4, the bus bar holder 132 includes insulating portions 132 c that protrude between the bus bars 131 adjacent in the stacking direction Z. The insulating part 132c is formed in a plate shape extending in the short direction Y. Each insulating portion 132c is horizontally provided between the support column 132a and the auxiliary support 132b. The insulating part 132c prevents discharge by insulating between the bus bars 131 of the unit cells 110 adjacent along the stacking direction Z.

  The bus bar holder 132 may be configured by joining the supporting column part 132a, the auxiliary supporting column part 132b, and the insulating part 132c formed independently from each other, or the supporting column part 132a, the auxiliary supporting column part 132b, and the insulating part 132c are integrally formed. You may form and comprise.

  As shown in FIGS. 3 and 4, the anode-side terminal 133 corresponds to the anode-side end of the battery group 100 </ b> G configured by alternately stacking the first cell sub-assemblies 100 </ b> M and the second cell sub-assemblies 100 </ b> N.

  As shown in FIGS. 3 and 4, the anode-side terminal 133 is joined to the anode-side bus bar 131 </ b> A located at the upper right in the drawing among the bus bars 131 arranged in a matrix. The anode side terminal 133 is made of a metal plate having conductivity, and when viewed along the short direction Y, the one end 133b and the other end 133c are aligned along the stacking direction Z with the central portion 133a as a reference. It consists of shapes refracted in different directions. The one end 133b is laser-bonded to the anode-side bus bar 131A. The other end portion 133c connects an external input / output terminal to a hole 133d (including a screw groove) opened in the center thereof.

  As shown in FIGS. 3 and 4, the cathode side terminal 134 corresponds to the end on the cathode side of the battery group 100G configured by alternately stacking the first cell sub-assemblies 100M and the second cell sub-assemblies 100N. As shown in FIGS. 3 and 4, the cathode side terminal 134 is joined to the cathode side bus bar 131 </ b> K located at the lower left in the figure among the bus bars 131 arranged in a matrix. The cathode side terminal 134 has the same configuration as the anode side terminal 133.

  As shown in FIG. 10A, the bus bar holder 132 is attached to the first spacer 121 in a state where the bus bar 131 is held. As shown in FIG. 10B, the terminal holder 135 is attached to the first spacer 121 in a state where the anode side terminal 133 is held. Similarly, the terminal holder 135 holding the cathode side terminal 134 is attached to the first spacer 121 in a state where the cathode side terminal 134 is held.

  The first spacer 121 will be further described in detail with reference to FIGS.

  As shown in FIG. 11A, the first spacer 121 forms a guide hole 121U to which the bus bar holder 132 and the terminal holder 135 are attached by laminating the first spacer 121. In the present embodiment, the guide hole 121U is formed in the first guide hole 121U1 and the central portion 121W2 formed in the end portion 121W1 of the first spacer 121 in the longitudinal direction (corresponding to the short direction Y of the unit cell 110). A second guide hole 121U2 is provided.

  The configuration of the first guide hole 121U1 will be described in detail with reference to FIGS. 12 (A) and 12 (B).

  As shown in FIG. 12A, the first spacer 121 has a first opening that opens on one end surface 121a of both end surfaces 121a and 121b extending in a direction intersecting the stacking direction Z of the first spacer 121. An opening 121P is provided. The first spacer 121 includes a recess 121Q that is recessed from the first opening 121P toward an end surface 121b different from the end surface 121a of the both end surfaces 121a and 121b. Furthermore, the first spacer 121 includes a second opening 121 </ b> R that communicates with the recess 121 </ b> Q and opens on a side surface 121 t along the stacking direction Z of the first spacer 121. FIG. 12A illustrates a case where the end surface 121a where the first opening 121P is formed is located above the end surface 121b in the stacking direction Z. However, the end surface 121a where the first opening 121P is formed may be positioned below the end surface 121b in the stacking direction Z.

  The first opening 121P and the second opening 121R are continuously formed from the end surface 121a to the side surface 121t. In other words, the first opening 121P and the second opening 121R are connected from the end surface 121a to the side surface 121t.

  As shown in FIGS. 12A and 12B, the first opening 121P of the first spacer 121A has a first spacer 121 in the stacking direction Z by stacking the first spacer 121 in the stacking direction Z. It is closed by the end surface 121b of the first spacer 121B disposed adjacent to 121A. A first guide hole 121U1 to which the bus bar holder 132 and the terminal holder 135 are attached is formed by the end surface 121b of the first spacer 121B and the second opening 121R of the first spacer 121A.

  As shown in FIGS. 13A and 13B, the second guide hole 121U2 is formed by the same configuration as the first guide hole 121U1.

  Referring to FIG. 11A again, in the present embodiment, a plurality of guide holes 121U are arranged along the stacking direction Z in a state where the first spacers 121 are stacked. The arrangement method of the plurality of guide holes 121U in the stacking direction Z is not particularly limited. In the present embodiment, the plurality of guide holes 121U are arranged adjacent to each other along the stacking direction Z. However, the plurality of guide holes 121U may be arranged at predetermined intervals along the stacking direction Z.

  As shown in FIGS. 12B and 14A, the first guide hole 121U1 includes a rib 121y on a part of the edge 121v that forms the guide hole 121U. In the present embodiment, the rib 121y of the first guide hole 121U1 is provided so as to protrude in the direction intersecting the stacking direction Z at the edge along the stacking direction Z among the edges 121v forming the first guide hole 121U1. .

  Similarly, as shown in FIGS. 13B and 15A, the second guide hole 121U2 includes a rib 121y at a part of the edge 121v that forms the second guide hole 121U2. In the present embodiment, the rib 121y of the second guide hole 121U2 is provided so as to protrude in the direction intersecting the stacking direction Z at the edge along the stacking direction Z among the edges 121v forming the second guide hole 121U2. .

  As shown in FIGS. 16A and 16B, the bus bar holder 132 includes an engaging claw 180 that engages with the rib 121y of the guide hole 121U. As shown in FIG. 16C, the engaging claw 180 is a main body that protrudes from a surface facing the first spacer 121 at a position corresponding to the guide hole 121U when the bus bar 131 is attached to the first spacer 121. Part 181. The engaging claw 180 has an engaging portion 182 that protrudes from the main body portion 181 and engages with the rib 121y. In the present embodiment, the engaging portion 182 protrudes from the main body portion 181 in the direction of the short direction Y of the unit cell 110 when the bus bar holder 132 is attached to the first spacer 121.

  As shown in FIGS. 17A and 17B, the terminal holder 135 includes an engaging claw 180 that engages with the rib 121y of the guide hole 121U, like the bus bar holder 132. The configuration of the engagement claw 180 provided in the terminal holder 135 is the same as the configuration of the engagement claw 180 provided in the bus bar holder 132.

  As shown in FIG. 18A, the first spacer 121 has a side surface 121t on which the second opening 121R is formed, a direction intersecting the stacking direction Z from the second opening 121R (the short side of the unit cell 110). It further has a third opening 121Z opening at a position offset in the direction Y).

  In the state where the first spacers 121 are stacked, the length H1 of the portion S1 sandwiched between the third openings 121Z of the adjacent first spacers 121 among the side surfaces 121t of the first spacers 121 is the adjacent first The length H2 of the portion S2 sandwiched between the second openings 121R of the one spacer 121 is larger.

  As shown in FIGS. 16A and 16C, the bus bar holder 132 includes a rib 185 that is inserted into the third opening 121 </ b> Z when the bus bar holder 132 is attached to the first spacer 121.

  Referring to FIG. 11B, the guide hole 121U has an electrode tab of the unit cell 110 when the unit cell 110 is viewed from the stacking direction Z in a state where the first spacer 121 is attached to the unit cell 110. The electrode tab 113 is offset from the electrode 113 in the width direction. The width direction of the electrode tab 113 refers to a direction (corresponding to the longitudinal direction X of the unit cell 110) and the stacking direction Z (unit cell 110) from the distal end 113d to the base end 113c of the electrode tab 113. Corresponding to the short direction Y).

  As described above with reference to FIGS. 12A and 12B, in the assembled battery 100 according to the present embodiment, the first opening 121P of the first spacer 121A has the first spacer 121A in the stacking direction Z. A guide hole 121U is formed by the end surface 121b and the second opening 121R of the first spacer 121A in a state closed by the end surface 121b of another first spacer 121B disposed adjacent to the first spacer 121B. That is, the guide hole 121U to which the mounting member 170 is attached can be formed by a simple method of stacking the first spacer 121 in the stacking direction Z. Therefore, the guide hole 121U to which the mounting member 170 is attached can be formed at a lower cost compared to a method of insert-molding a fastening part such as a nut or a method of forming a guide hole after forming the first spacer.

  Moreover, although the shaping | molding method of the 1st spacer 121 is not specifically limited, The shaping | molding method using a shaping | molding die is mentioned as a method of forming the 1st spacer 121 at low cost. Here, in the first spacer 121, the first opening 121P and the second opening 121R are continuously formed from one end surface 121a to the side surface 121t. Thereby, when forming the 1st spacer 121 using a shaping | molding die, the 2nd opening part 121R opened to the side surface 121t does not become an undercut. Therefore, when forming the 1st spacer 121 using a shaping | molding die, it originates in providing the 2nd opening part 121R in the side surface 121t, and an additional manufacturing cost does not arise.

  Further, as described above, a plurality of guide holes 121U are arranged adjacent to the stacking direction Z in a state where the first spacers 121 are stacked. Thereby, the bus bar holder 132 (terminal holder 135) can be attached using the plurality of guide holes 121U arranged adjacent to the stacking direction Z. Therefore, the bus bar holder 132 (terminal holder 135) can be more firmly attached to the side surface 121t along the stacking direction Z of the unit cells 110 in the first spacer 121.

  Further, as described above, the guide hole 121U includes the rib 121y at a part of the edge 121v that forms the guide hole 121U. The bus bar holder 132 (terminal holder 135) includes an engaging claw 180 that engages with the rib 121y. As a result, as shown in FIGS. 14B and 15B, the engagement claw 180 provided in the bus bar holder 132 (terminal holder 135) is engaged with the rib 121y provided in the guide hole 121U, whereby the guide hole 121U is engaged. The bus bar holder 132 (terminal holder 135) attached to the is difficult to come off.

  Further, as described above, the first spacer 121 further includes the third opening 121Z that opens to the side surface 121t where the second opening 121R is formed. The bus bar holder 132 includes a rib 185 that is inserted into the third opening 121 </ b> Z when the bus bar holder 132 is attached to the first spacer 121. Accordingly, as shown in FIG. 19A, the bus bar holder 132 is attached to the first spacer 121 so that the rib 185 is inserted into the third opening 121Z, whereby the bus bar holder 132 is stacked in the first spacer 121. Positioning in Z can be performed.

  Further, as described above with reference to FIG. 18A, the third opening 121Z has a direction intersecting the stacking direction Z from the second opening 121R on the side surface 121t where the second opening 121R is formed. Open at a position offset to. That is, the second opening 121 </ b> R does not exist between the third openings 121 </ b> Z adjacent in the stacking direction Z. Therefore, as shown in FIG. 19B, the rib 185 is opened to the third opening while the rib 185 is aligned in the stacking direction Z with respect to the portion S1 sandwiched between the third openings 121Z of the first spacer. It can be inserted into the part 121Z. This facilitates insertion of the rib 185 provided in the bus bar holder 132 into the third opening 121Z.

  On the other hand, when the rib 185 is inserted into the second opening 121R along the stacking direction Z with respect to the portion S2 sandwiched between the second openings 121R of the adjacent first spacers 121, the rib 185 is There is a possibility of incorrect insertion. Specifically, of the side surface 121t along the stacking direction Z of the first spacer 121, the length H2 of the portion S2 sandwiched between the second openings 121R of the adjacent first spacers 121 is the third opening. It is smaller than the length H1 of the portion S1 sandwiched between 121Z. Therefore, the rib 185 may be erroneously inserted into another second opening 121R adjacent to the second opening 121R where the rib 185 should be originally inserted. In the present embodiment, as described above, the length H1 of the portion S1 sandwiched between the third openings 121Z of the adjacent first spacers 121 among the side surfaces 121t along the stacking direction Z of the first spacers 121 is as follows. The length H2 of the portion S2 sandwiched between the second openings 121R of the adjacent first spacers 121 is larger. Therefore, the possibility that the rib 185 included in the bus bar holder 132 is erroneously inserted into another third opening 121Z adjacent to the third opening 121Z that should be originally inserted can be reduced.

  Further, as described above, the guide hole 121U extends from the electrode tab 113 of the unit cell 110 when the unit cell 110 is viewed from the stacking direction Z in a state where the first spacer 121 is attached to the unit cell 110. The electrode tab 113 is formed at a position offset in the width direction (corresponding to the short direction Y of the unit cell 110). Thereby, the guide hole 121U can be formed in the width direction of the electrode tab 113 using the space adjacent to the electrode tab 113. Thereby, since it is not necessary to separately provide a space for forming the guide hole 121U, the volume efficiency of the assembled battery 100 as a whole is improved.

  As shown in FIGS. 1 to 3, the protective cover 140 covers the bus bar unit 130 so that the bus bars 131 are short-circuited with each other, or the bus bar 131 is in contact with an external member to be short-circuited or short-circuited. To prevent. Further, the protective cover 140 causes the anode side terminal 133 and the cathode side terminal 134 to face the outside, and charges and discharges the power generation element 111 of each unit cell 110. The protective cover 140 is made of plastics having insulating properties.

  As shown in FIG. 3, the protective cover 140 is formed in a flat plate shape and stands along the stacking direction Z. The protective cover 140 has a shape in which the upper end 140b and the lower end 140c of the side surface 140a thereof are refracted along the longitudinal direction X, and is fitted to the bus bar unit 130.

  As shown in FIGS. 2 and 3, the side surface 140 a of the protective cover 140 is formed of a rectangular hole that is slightly larger than the anode side terminal 133 at a position corresponding to the anode side terminal 133 provided in the bus bar unit 130. A first opening 140d is provided. Similarly, the side surface 140a of the protective cover 140 includes a second opening 140e formed of a rectangular hole slightly larger than the cathode side terminal 134 at a position corresponding to the cathode side terminal 134 provided in the bus bar unit 130. Yes.

  As shown in FIGS. 1 and 2, the housing 150 accommodates the battery group 100 </ b> G in a state of being pressurized along the stacking direction. An appropriate surface pressure is applied to the power generation element 111 by pressing the power generation element 111 of each unit cell 110 provided in the battery group 100G with the upper pressure plate 151 and the lower pressure plate 152.

  As shown in FIGS. 1 and 2, the upper pressure plate 151 is disposed above the battery group 100G in the stacking direction Z. The upper pressure plate 151 has a pressure surface 151 a protruding downward along the stacking direction Z in the center. The power generation element 111 of each unit cell 110 is pressed downward by the pressing surface 151a. The upper pressure plate 151 includes a holding portion 151 b that extends along the longitudinal direction X from both sides along the lateral direction Y. The holding part 151b covers the placement parts 121M and 121N of the first spacer 121 or the placement parts 122M and 122N of the second spacer 122. In the center of the holding portion 151b, a locating hole 151c communicating with the positioning hole 121d of the first spacer 121 or the positioning hole 122d of the second spacer 122 along the stacking direction Z is opened. The locate hole 151c is inserted with a bolt for connecting the assembled batteries 100 to each other. The upper pressure plate 151 is made of a metal plate having a sufficient thickness.

  As shown in FIGS. 1 and 2, the lower pressure plate 152 has the same configuration as the upper pressure plate 151 and reverses the top and bottom of the upper pressure plate 151. The lower pressure plate 152 is disposed below along the stacking direction Z of the battery group 100G. The lower pressure plate 152 presses the power generation element 111 of each unit cell 110 upward by the pressure surface 151a protruding upward along the stacking direction Z.

  As shown in FIGS. 1 and 2, the pair of side plates 153 are arranged so that the upper pressure plate 151 and the lower pressure plate 152 that pressurize the battery group 100G while sandwiching the battery group 100G from above and below in the stacking direction Z are not separated from each other. The relative positions of the pressure plate 151 and the lower pressure plate 152 are fixed. The side plate 153 is made of a rectangular metal plate and stands up along the stacking direction Z. The pair of side plates 153 are joined to the upper pressure plate 151 and the lower pressure plate 152 by laser welding from both sides in the short direction Y of the battery group 100G. Each side plate 153 is subjected to seam welding or spot welding along the longitudinal direction X with respect to the portion of the upper end 153 a that is in contact with the upper pressure plate 151. Similarly, each side plate 153 is subjected to seam welding or spot welding along the longitudinal direction X with respect to the portion of the lower end 153 b that is in contact with the lower pressure plate 152. The pair of side plates 153 covers and protects both sides in the short direction Y of the battery group 100G.

  Next, a method for manufacturing the assembled battery 100 will be described with reference to FIGS.

  A manufacturing method (manufacturing process) of the assembled battery 100 includes a stacking process (FIG. 20) for stacking members constituting the assembled battery 100, a pressurizing process (FIG. 21) for pressing the battery group 100G of the assembled battery 100, and the side plate 153. A first joining step for joining the upper pressure plate 151 and the lower pressure plate 152 (FIG. 22), a second joining step for joining the bus bar 131 to the electrode tab 113 of the unit cell 110 and joining the terminal to the bus bar 131 (FIG. 22). 23 to 26), and a mounting process (FIG. 27) for attaching the protective cover 140 to the bus bar 131.

  A lamination process for laminating members constituting the assembled battery 100 will be described with reference to FIG.

  FIG. 20 is a diagram illustrating a method for manufacturing the assembled battery 100 according to the present embodiment, and is a perspective view schematically illustrating a state in which members constituting the assembled battery 100 are sequentially stacked on the mounting table 701. is there.

  The mounting table 701 used in the stacking process is formed in a plate shape and provided along a horizontal plane. The mounting table 701 is a locating pin for positioning that aligns the relative positions of the lower pressure plate 152, the first cell sub-assembly 100M, the second cell sub-assembly 100N, and the upper pressure plate 151 along the longitudinal direction X and the short direction Y, which are sequentially stacked. 702. Four locate pins 702 stand on the upper surface 701a of the mounting table 701 at a predetermined interval. The distance between the four locating pins 702 corresponds to the distance between the locating holes 152c provided at the four corners of the upper pressure plate 151, for example. The members constituting the assembled battery 100 are stacked using a robot arm, a hand lifter, a vacuum suction type collet, or the like.

  In the stacking step, as shown in FIG. 20, the lower pressure plate 152 is lowered by the robot arm along the stacking direction Z while the locate holes 152c provided at the four corners are inserted into the locate pins 702. It is placed on the upper surface 701 a of the mounting table 701. Next, the robot arm lowers the first cell sub-assembly 100M along the stacking direction Z in a state where the locating holes provided in the first spacer 121 and the second spacer 122 of the constituent members are inserted into the locating pins 702. And laminated on the lower pressure plate 152. Similarly, three sets of second cell sub-assemblies 100N and first cell sub-assemblies 100M are alternately stacked by the robot arm. A double-sided tape 160 is attached to the upper surface of the first cell sub-assembly 100M and the second cell sub-assembly 100N to be bonded to a laminated member that is laminated above. Thereafter, the upper pressure plate 151 is stacked on the first cell sub-assembly 100M by the robot arm while being lowered along the stacking direction Z in a state where the locate holes 151c provided at the four corners are inserted into the locate pins 702.

  A pressurizing process for pressurizing the battery group 100G of the assembled battery 100 will be described with reference to FIG.

  FIG. 21 is a perspective view schematically showing a state in which the constituent members of the assembled battery 100 are pressed from above, following FIG. 20.

  The pressurizing jig 703 used in the pressurizing step includes a pressurizing unit 703a formed in a plate shape and provided along a horizontal plane, and a support unit 703b formed in a columnar shape and erected and joined to the upper surface of the pressurizing unit 703a. I have. The support portion 703b connects an electric stage and a hydraulic cylinder that are driven along the stacking direction Z. The pressurizing part 703a moves downward and upward along the stacking direction Z via the support part 703b. The pressurizing unit 703a pressurizes the laminated member in contact.

  In the pressurizing step, as shown in FIG. 21, the pressurizing unit 703a of the pressurizing jig 703 is driven in the stacking direction Z while being in contact with the upper pressurizing plate 151 by driving the electric stage connected to the support unit 703b. Descent along the bottom. The upper pressure plate 151 pressed along the lower side and the lower pressure plate 152 mounted on the mounting table 701 are pressed while holding the battery group 100G. An appropriate surface pressure is applied to the power generation element 111 of each unit cell 110 provided in the battery group 100G. The pressurizing process is continued until the next first joining process is completed.

  A first joining step for joining the side plate 153 to the upper pressure plate 151 and the lower pressure plate 152 will be described with reference to FIG.

  FIG. 22 is a perspective view schematically showing a state in which the side plate 153 is laser-welded to the upper pressure plate 151 and the lower pressure plate 152 following FIG.

  The pressing plate 704 used in the first joining step presses the side plate 153 against the upper pressure plate 151 and the lower pressure plate 152, respectively, and causes the side plate 153 to contact the upper pressure plate 151 and the lower pressure plate 152, respectively. The pressing plate 704 is made of metal and is formed in a long plate shape. The push plate 704 opens a linear slit 704b along the longitudinal direction in the main body 704a. The push plate 704 is erected in the short direction along the stacking direction Z. The pressing plate 704 allows the laser beam L1 for welding to pass through the slit 704b while pressing the side plate 153 by the main body 704a.

  The laser oscillator 705 is a light source that joins the side plate 153 to the upper pressure plate 151 and the lower pressure plate 152. The laser oscillator 705 is composed of, for example, a YAG (yttrium, aluminum, garnet) laser. The laser light L1 derived from the laser oscillator 705 irradiates the upper end 153a and the lower end 153b of the side plate 153 in a state where the optical path is adjusted by, for example, an optical fiber or a mirror and is condensed by a condenser lens. For example, the laser beam L1 derived from the laser oscillator 705 may be split by a half mirror and irradiated to the upper end 153a and the lower end 153b of the side plate 153 at the same time.

  In the first joining step, as shown in FIG. 22, the laser oscillator 705 scans the laser beam L1 horizontally through the slit 704b of the pressing plate 704 with respect to the upper end 153a of the side plate 153 pressed by the pressing plate 704. Then, the side plate 153 and the upper pressure plate 151 are joined by seam welding at a plurality of locations. Similarly, the laser oscillator 705 horizontally scans the laser beam L1 through the slit 704b of the pressing plate 704 with respect to the lower end 153b of the side plate 153 pressed by the pressing plate 704, and moves the side plate 153 and the lower pressing plate 152. Join by seam welding at multiple locations.

  A second joining process for joining the bus bar 131 to the electrode tab 113 of the unit cell 110 and joining the terminal to the bus bar 131 will be described with reference to FIGS.

  FIG. 23 is a perspective view schematically showing a state where a part of the bus bar unit 130 is attached to the battery group 100G, following FIG. FIG. 24 is a perspective view schematically showing a state in which the bus bar 131 of the bus bar unit 130 is laser-welded to the electrode tab 113 of the unit cell 110 following FIG. FIG. 25 is a side view showing in cross section the main part of the state in which the bus bar 131 is laser-bonded to the electrode tab 113 of the stacked unit cell 110. FIG. 26 is a perspective view schematically showing a state in which the anode side terminal 133 and the cathode side terminal 134 are laser-welded to the anode side bus bar 131A and the cathode side bus bar 131K following FIG. 24 and FIG.

  In the second bonding step, as shown in FIGS. 22 to 23, the mounting table 701 rotates 90 ° counterclockwise in the figure to face the electrode tab 113 of the battery group 100G and the laser oscillator 705.

  Next, the bus bar holder 132 holding each bus bar 131 integrally is attached to the first spacer 121 by the robot arm. At this time, the rib 185 provided on the bus bar holder 132 is inserted into the third opening 121Z of the first spacer 121, whereby the first spacer 121 can be positioned in the stacking direction Z (FIG. 19 ( A)).

  Further, as described above, the third opening 121Z opens at a position offset from the second opening 121R in the direction crossing the stacking direction Z on the side surface 121t where the second opening 121R is formed ( FIG. 18A). As a result, the rib 185 can be inserted into the third opening 121Z with the rib 185 along the stacking direction Z with respect to the portion S1 sandwiched between the third openings 121Z of the first spacer (FIG. 19B). )reference). Therefore, it is possible to easily insert the rib 185 included in the bus bar holder 132 into the third opening 121Z.

  Further, as described above, the length H1 of the portion S1 sandwiched between the third openings 121Z of the adjacent first spacers 121 among the side surfaces 121t along the stacking direction Z of the first spacers 121 is adjacent. The length H2 of the portion S2 sandwiched between the second openings 121R of the first spacer 121 is larger. Therefore, when the rib 185 is inserted into the third opening 121Z along the stacking direction Z with respect to the portion S1 sandwiched between the third openings 121Z, the third opening 121Z to be originally inserted is inserted. The possibility that the rib 185 is erroneously inserted into the third opening 121Z different from the above can be reduced.

  Further, as described above, the guide hole 121U includes the rib 121y at a part of the edge 121v that forms the guide hole 121U. The bus bar holder 132 includes an engaging claw 180 that engages with the rib 121y. Accordingly, the engagement claw 180 provided in the bus bar holder 132 is engaged with the rib 121y provided in the guide hole 121U, so that the bus bar holder 132 attached to the guide hole 121U is hardly detached (FIGS. 14B and 15B). reference).

  Next, as shown in FIGS. 24 and 25, the laser oscillator 705 irradiates the bus bar 131 with the laser light L1, and joins the bus bar 131 and the tip 113d of the electrode tab 113 by seam welding or spot welding.

  Next, as shown in FIG. 26, the terminal holder 135 holding the anode side terminal 133 is attached to the first spacer 121. Similarly, a terminal holder 135 holding the cathode side terminal 134 is attached to the first spacer 121.

  Then, the anode side terminal 133 is joined to the anode side bus bar 131A (upper right in FIG. 4) corresponding to the end on the anode side among the bus bars 131 arranged in a matrix. Similarly, the cathode side terminal 134 is joined to the cathode side bus bar 131K (lower left in FIG. 4) corresponding to the end of the cathode side among the bus bars 131 arranged in a matrix.

  A mounting process for attaching the protective cover 140 to the bus bar 131 will be described with reference to FIG.

  FIG. 27 is a perspective view schematically showing a state where the protective cover 140 is attached to the bus bar unit 130, following FIG. 26.

  In the mounting process, the protective cover 140 is attached to the bus bar unit 130 while the upper end 140b and the lower end 140c of the protective cover 140 are fitted to the bus bar unit 130 using a robot arm. The upper end 140b and the lower end 140c of the protective cover 140 may be joined to the bus bar unit 130 with an adhesive. The protective cover 140 has the anode side terminal 133 exposed to the outside from the first opening 140d and the cathode side terminal 134 exposed to the outside from the second opening 140e. The bus bar unit 130 is covered with the protective cover 140 to prevent the bus bars 131 from being short-circuited or from being short-circuited or leaked due to the bus bar 131 contacting an external member. The assembled battery 100 that has been manufactured is removed from the mounting table 701 and carried out to an inspection process for inspecting battery performance and the like.

  The manufacturing method of the assembled battery 100 described with reference to FIGS. 20 to 27 includes an automatic machine that controls the entire process with a controller, a semi-automatic machine that handles a part of the process, or a manual that handles the entire process. It may be embodied by any form of the machine.

  According to the assembled battery 100 and the manufacturing method of the assembled battery 100 according to the present embodiment described above, the following operational effects are obtained.

  The assembled battery 100 according to the present embodiment includes a stacked body 100S in which a plurality of flat unit cells 110 are stacked in the thickness direction and the unit cells 110 are electrically connected to each other, and a stack direction of the unit cells 110. A first spacer 121 disposed between adjacent cells 110 in Z and stacked in the stacking direction Z, and a mounting member 170 attached to the first spacer 121 (in this embodiment, a bus bar holder 132 and a terminal holder 135) And having. The first spacer 121 includes a first opening 121P that opens in one end surface 121a out of both end surfaces 121a and 121b that extend in a direction intersecting the stacking direction Z of the first spacer 121, and the first opening 121P. A recess 121Q that is recessed toward the other end surface 121b of the both end surfaces 121a and 121b, and a second hole that communicates with the recess 121Q and opens to the side surface 121t along the stacking direction Z of the first spacer 121. And an opening 121R. The first opening 121P and the second opening 121R are continuously formed from one end surface 121a to the side surface 121t. Then, the first spacer 121 is stacked in the stacking direction Z, so that the first opening 121P of the first spacer 121 is disposed adjacent to the first spacer 121 in the stacking direction Z. A guide hole 121U to which the mounting member 170 is attached is formed by the other end surface 121b of the first spacer 121 and the other end surface 121b and the second opening 121R of the first spacer 121. .

  According to the assembled battery 100 having such a configuration, the guide hole in which the mounting member 170 is attached to the side surface 121t along the stacking direction Z of the first spacer 121 by a simple method of stacking the first spacer 121 in the stacking direction Z. 121U can be formed. Therefore, the guide hole 121U to which the mounting member 170 is attached can be formed at a lower cost than the method of insert molding a mounting nut or the like. Therefore, in the assembled battery formed by stacking a plurality of unit cells via the spacer, the assembled battery in which the mounting member can be attached to the side surface along the stacking direction of the unit cells in the spacer can be provided at low cost.

  In the assembled battery 100 according to the present embodiment, a plurality of guide holes 121U are arranged adjacent to the stacking direction Z in a state where the first spacers 121 are stacked.

  According to the assembled battery having such a configuration, the mounting member 170 can be attached using the plurality of guide holes 121U disposed adjacent to the stacking direction Z. Thereby, the attachment member can be more firmly attached to the side surface along the stacking direction of the unit cells in the spacer.

  Further, in the assembled battery 100 according to the present embodiment, the guide hole 121U includes a rib 121y at a part of the edge 121v that forms the guide hole 121U. The mounting member 170 includes an engaging claw 180 that engages with the rib 121y.

  According to the assembled battery 100 having such a configuration, the engaging claw 180 included in the mounting member 170 is engaged with the rib 121y included in the guide hole 121U, so that the mounting member 170 attached to the guide hole 121U is difficult to come off. Therefore, it is possible to more firmly attach the mounting member to the side surface along the stacking direction of the unit cells in the spacer.

  In the assembled battery 100 according to the present embodiment, the first spacer 121 is a position that is offset from the second opening 121R in the direction intersecting the stacking direction Z on the side surface 121t where the second opening 121R is formed. And a third opening 121Z that opens to the top. The mounting member 170 includes a rib 185 that is inserted into the third opening 121 </ b> Z when the mounting member 170 is attached to the first spacer 121. Then, in the state where the first spacers 121 are stacked, the length of the portion S1 sandwiched between the third openings 121Z of the adjacent first spacers 121 among the side surfaces 121t along the stacking direction Z of the first spacers 121. The length H1 is greater than the length H2 of the portion S2 sandwiched between the second openings 121R of the adjacent first spacers 121.

  According to the assembled battery having such a configuration, the bus bar holder 132 is attached to the first spacer 121 so that the rib 185 included in the bus bar holder 132 is inserted into the third opening 121Z. Positioning in the stacking direction Z can be performed.

  Further, the third opening 121Z opens at a position offset in a direction intersecting the stacking direction Z from the second opening 121R on the side surface 121t where the second opening 121R is formed. Accordingly, the rib 185 can be inserted into the third opening 121Z while the rib 185 is aligned in the stacking direction Z with respect to the portion S1 sandwiched between the third openings 121Z of the first spacer. This facilitates insertion of the rib 185 provided in the bus bar holder 132 into the third opening 121Z.

  In addition, among the side surfaces 121t along the stacking direction Z of the first spacers 121, the length H1 of the portion S1 sandwiched between the third openings 121Z of the adjacent first spacers 121 is equal to that of the adjacent first spacers 121. It is larger than the length of the portion S2 sandwiched between the second openings 121R. Therefore, the possibility that the rib 185 included in the bus bar holder 132 is erroneously inserted into another third opening 121Z adjacent to the third opening 121Z that should be originally inserted can be reduced.

  In the assembled battery 100 according to the present embodiment, the unit cell 110 includes a battery body 110H that includes the power generation element 111 and is formed flat, and a flat electrode tab 113 that is led out from the battery body 110H. Then, the guide hole 121U has a width from the electrode tab 113 of the unit cell 110 to the width of the electrode tab 113 when the unit cell 110 is viewed from the stacking direction Z in a state where the first spacer 121 is attached to the unit cell 110. It is formed at a position offset in the direction.

  According to the assembled battery having such a configuration, the guide hole 121U can be formed using the space adjacent to the electrode tab 113 in the width direction of the electrode tab 113. Thereby, since it is not necessary to separately provide a space for forming the guide hole, the volume efficiency of the entire assembled battery is improved.

  In the assembled battery 100 according to this embodiment, the mounting member 170 is a bus bar holder 132 that holds the bus bar 131 that electrically connects the single cells 110 to each other.

  According to the assembled battery having such a configuration, the bus bar 131 can be held at a predetermined position during manufacturing of the assembled battery 100 by attaching the bus bar holder to the guide hole 121U. For this reason, it becomes easy to manufacture the assembled battery.

  Further, in the assembled battery 100 according to the present embodiment, the mounting member 170 is a terminal holder 135 that holds the anode side terminal 133 and the cathode side terminal 134 that extract current from the stacked body 100S.

  According to the assembled battery having such a configuration, by attaching the terminal holder 135 to the guide hole 121U, the anode side terminal 133 and the cathode side terminal 134 can be held at predetermined positions during the production of the assembled battery 100. For this reason, it becomes easy to manufacture the assembled battery.

  In addition, the first spacer 121 according to the present embodiment is disposed between the adjacent unit cells 110 in the stacking direction Z of the unit cells 110 among the unit cells 110 having a flat shape and stacked in the thickness direction. It is a battery pack spacer that is stacked along the stacking direction Z and to which the mounting member 170 is attached. The first spacer 121 according to the present embodiment includes a first opening 121P that opens on one end surface 121a of both end surfaces 121a and 121b extending in a direction intersecting the stacking direction Z of the first spacer 121, and a first opening 121P. A recess 121Q formed to be recessed from one opening 121P toward the other end surface 121b of both end faces 121a and 121b, and a side surface 121t along the stacking direction Z of the first spacer 121, communicating with the recess 121Q And a second opening 121R that opens to the front. The first opening 121P and the second opening 121R are continuously formed from one end surface 121a to the side surface 121t. Then, the first spacer 121 is stacked in the stacking direction Z, so that the first opening 121P of the first spacer 121 is disposed adjacent to the first spacer 121 in the stacking direction Z. The other end surface 121b of the first spacer 121 is closed, and the second opening 121R of the first spacer 121 and the other end surface 121b form a guide hole 121U to which the mounting member 170 is attached. .

  According to the first spacer 121 having such a configuration, a guide in which the mounting member 170 is attached to the side surface 121t along the stacking direction Z of the first spacer 121 by a simple method of stacking the first spacer 121 in the stacking direction Z. The hole 121U can be formed. Therefore, the guide hole 121U to which the mounting member 170 is attached can be formed at a lower cost than the method of insert molding a mounting nut or the like. Therefore, in an assembled battery formed by stacking a plurality of unit cells via a spacer, an assembled battery spacer capable of attaching a mounting member to a side surface of the spacer along the stacking direction of the unit cells can be provided at low cost.

(Modification example)
In the embodiment described above, the rib 121y of the guide hole 121U is provided so as to protrude in the direction intersecting the stacking direction Z at the edge along the stacking direction Z of the edge 121v forming the guide hole 121U. Then, the engaging portion 182 of the engaging claw 180 provided in the mounting member 170 (in the above-described embodiment, the bus bar holder 132 and the terminal holder 135) is provided when the mounting member 170 is attached to the first spacer 121. It protruded from the main body 181 in the direction of the short direction Y.

  However, the rib 121y of the guide hole 121U may be provided so as to protrude in the stacking direction Z at the edge that intersects the stacking direction Z of the edge 121v that forms the guide hole 121U. And the engaging part of the engaging claw with which a mounting member is provided may protrude from a main-body part toward the lamination direction Z, when a mounting member is attached to the 1st spacer 121.

  FIG. 28A is an enlarged view of a cross section corresponding to a cross section taken along line 28A-28A in FIG. 11A in a state where the bus bar holder 232 is attached to the first spacer 221 according to the modified example. B) is an enlarged view corresponding to FIG. 16C of the bus bar holder 232 according to the modified example. In addition, about the member same as the assembled battery 100 of embodiment mentioned above, the same code | symbol is used and the description is partially omitted.

  As shown in FIG. 28 (A), the rib 221y of the guide hole 121U according to this modification is provided so as to protrude in the stacking direction Z at the edge crossing the stacking direction among the edges 121v forming the guide hole 121U. It has been.

  As shown in FIG. 28 (B), the engaging claws 280 included in the bus bar holder 232 according to this modification correspond to the guide holes 121U when the bus bar holder 232 is attached to the first spacer 221 according to this modification. It has a main body 281 that protrudes from a surface facing the first spacer 221 at a position. The engaging claw 280 includes an engaging portion 282 that protrudes from the main body portion 281 in the stacking direction Z when the bus bar holder 232 is attached to the first spacer 221.

  According to the rib 121y of the guide hole 121U configured as described above and the engaging claw 280 provided in the bus bar holder 232, the engaging claw 280 can be engaged with the rib 221y as shown in FIG. Therefore, the bus bar holder 232 can be firmly attached to the first spacer 221 as in the above-described embodiment.

  As described above, the assembled battery has been described through the embodiment. However, the present invention is not limited to the configuration described in the embodiment, and can be appropriately changed based on the description of the scope of claims.

  For example, in the embodiment and the modification described above, the case where the mounting member is a bus bar holder and a terminal holder has been described as an example. However, the mounting member is not limited as long as it is a member attached to the side surface along the stacking direction of the spacers arranged between the unit cells adjacent in the stacking direction of the unit cells in the assembled battery. For example, as a mounting member, a protective cover, a cooling unit for cooling the assembled battery, or the like may be attached to the guide hole of the spacer.

  In the above-described embodiment and modification, a rib is provided on a part of the edge portion that forms the guide hole, and an engaging claw that engages with the rib is provided on the mounting member. However, in the mounting member, instead of the engaging claw or together with the engaging claw, when the mounting member is attached to the spacer, it protrudes from the surface facing the spacer at the position corresponding to the guide hole and is press-fitted into the guide hole. A protruding portion may be provided. According to such a configuration, the mounting member can be attached to the spacer by press-fitting the protrusion into the guide hole.

  In the above-described embodiments and modifications, the anode-side electrode tab and the cathode-side electrode tab are derived from one side of the battery body. However, the anode side electrode tab and the cathode side electrode tab may be derived from different sides of the battery body.

100 battery packs,
100S laminate,
100G battery group,
100M first cell sub-assembly,
100N second cell sub-assembly,
110 cell,
110H battery body,
111 power generation elements,
112 Laminate film,
113 electrode tabs,
113A anode side electrode tab,
113K cathode side electrode tab,
113c proximal end,
113d tip,
120 a pair of spacers 121 a first spacer;
121P first opening,
121Q recess,
121R second opening,
121U guide hole,
121Z third opening,
121a, 121b end face,
121t side,
121v edge,
121y ribs,
122 second spacer,
130 bus bar unit,
131 Busbar,
131A Anode-side bus bar (first bus bar),
131K cathode side bus bar (second bus bar),
132 bus bar holder (mounting member),
133 Anode terminal,
134 cathode side terminal,
135 Terminal holder (mounting member),
140 protective cover,
150,
151 Upper pressure plate,
152 lower pressure plate,
153 side plate,
153a top edge,
153b lower end,
160 double-sided tape,
170 mounting member,
180 engaging claws,
185 ribs,
701 mounting table,
702 Locate pin,
703 pressure jig,
704 pressing plate,
705 laser oscillator,
L1 laser light,
S1 is a portion sandwiched between the third openings,
S2 The portion sandwiched between the second openings,
X (longitudinal direction of the unit cells 110 intersecting with the stacking direction of the unit cells 110),
Y (crossing the stacking direction of the unit cells 110 and the short direction of the unit cells 110),
Z (stacking direction of unit cell 110).

Claims (8)

A laminate in which a plurality of unit cells having a flat shape are laminated in the thickness direction and the unit cells are electrically connected to each other;
A spacer disposed between the unit cells adjacent in the stacking direction of the unit cells, and stacked in the stacking direction;
A mounting member attached to the spacer,
The spacer includes a first opening that opens to one end face of both end faces that extend in a direction intersecting the stacking direction of the spacer, and a second opening from the first opening to the other end face of the both end faces. A recess formed to be recessed toward the recess, and a second opening that communicates with the recess and opens to a side surface along the stacking direction of the spacer,
The first opening and the second opening are continuously formed from the one end surface to the side surface,
By laminating the spacer in the laminating direction, the first opening of one of the spacers is caused by the other end surface of the other spacer disposed adjacent to the one spacer in the laminating direction. The assembled battery, which is closed, and a guide hole to which the mounting member is attached is formed by the other end surface and the second opening of the one spacer.   The assembled battery according to claim 1, wherein a plurality of the guide holes are arranged adjacent to each other in the stacking direction in a state where the spacers are stacked. The guide hole includes a rib on a part of an edge part forming the guide hole,
The assembled battery according to claim 1, wherein the mounting member includes an engaging claw that engages with the rib. The spacer further includes a third opening that opens at a position that is offset from the second opening in a direction intersecting the stacking direction on the side surface where the second opening is formed,
The mounting member includes a rib that is inserted into the third opening when the mounting member is attached to the spacer.
In the state where the spacers are stacked, the length of the portion sandwiched between the third openings of the adjacent spacers among the side surfaces is between the second openings of the adjacent spacers. The assembled battery according to any one of claims 1 to 3, wherein the assembled battery is larger than a length of a sandwiched portion. The unit cell includes a battery main body including a power generation element and formed flat, and a flat electrode tab derived from the battery main body,
The guide hole is a position offset from the electrode tab of the unit cell in the width direction of the electrode tab when the unit cell is viewed in plan from the stacking direction in a state where the spacer is attached to the unit cell. The assembled battery of any one of Claims 1-4 currently formed in.   The assembled battery according to claim 1, wherein the mounting member is a bus bar holder that holds a bus bar that electrically connects the single cells.   The assembled battery according to any one of claims 1 to 6, wherein the mounting member is a terminal holder that holds a terminal for taking out current from the laminate. Among the cells that have a flat shape and are stacked in the thickness direction, the cells are disposed between the cells adjacent in the stacking direction of the cells, and are stacked along the stacking direction and attached to the mounting member A battery spacer,
A first opening that opens to one end face of both end faces that extend in a direction intersecting the stacking direction of the spacer, and a recess that extends from the first opening toward the other end face of the both end faces. A recess formed, and a second opening that communicates with the recess and opens on a side surface of the spacer along the stacking direction.
The first opening and the second opening are continuously formed from the one end surface to the side surface,
By laminating the spacer in the laminating direction, the first opening of one of the spacers is caused by the other end surface of the other spacer disposed adjacent to the one spacer in the laminating direction. A spacer for an assembled battery, which is closed and a guide hole to which the mounting member is attached is formed by the second opening and the other end surface of the one spacer.