JP2012079543A - Fastening structure and fastening member of cell unit for battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To bind flat batteries or spacers more reliably and firmly without increasing the number of members and the assembling man-hour.SOLUTION: In the fastening structure of a cell unit for battery module, a laminate 4 where a plurality of flat batteries 1A-1D are held, respectively, from above and below by means of spacers 3A-3E, or the like, and laminated in non-contact state is integrated by binding each spacer with a fastening member 2. The fastening member 2 has a substantially U-shaped longitudinal section, and engaging parts (25, 26) are provided on the inner surfaces facing each other. In a state where each spacer is arranged between the inner surfaces facing each other, each spacer is held by the engaging part and a part (the engaging part 26 or a side part 21) thus regulating the movement of each spacer.

Description

  The present invention relates to a battery module cell unit fastening structure and fastening member in which a plurality of flat batteries having electrode terminals are stacked and the electrode terminals of each battery are electrically connected to increase the output and / or capacity.

9 and 10 show a cell unit disclosed in Patent Document 1 and a battery module using the cell unit. The battery module 100 shown in FIG. 9 has a structure in which the cell unit 140 shown in FIG. 9B is housed in a metal case 120 (lower case 122 and upper case 124) as shown in FIG. The battery pack is not limited, and a plurality of batteries are connected in series or in parallel to create a battery pack according to the target current, voltage, and capacity. Here, the cell unit 140 includes a plurality of flat batteries 144A to 144D (144) and a plurality of spacers 160A to 160E (160) that sandwich each flat battery from above and below and stack them in a non-contact state. 161A to 161E (161), and a fastening member 170 which is an insulating cover for restraining each spacer
(The fastening member on the spacer 161 side is omitted).

  Each flat battery 144 includes a power generation element with electrode terminals 147 and 148, an exterior material that seals the power generation element except for the electrode terminals, and the like. Each spacer 160 has a window part 163, a through-hole 164, a voltage detection part 169, etc. as shown in FIG. 10, and is arranged on the front side of the laminated body 142 so as to sandwich the electrode terminal 147 of each flat battery from above and below. The Each spacer 161 has a through-hole 165 and is disposed on the rear side of the stacked body 142 so as to sandwich the other electrode terminal 148 of each flat battery from above and below.

  In the spacer 160, the window portion 163 exposes a part of the electrode terminal and can electrically connect each flat battery 144. The through holes 164 and 165 correspond to the through holes 130 provided at the four corners of the case 122, and bolts (not shown) are inserted therethrough. The voltage detection unit 169 exposes the peripheral portion of the sandwiched electrode terminal and is disposed in the opening 134 provided on the case front surface 123. However, the voltage detection unit 169 may be configured by a dedicated terminal. Among the spacers 160, the upper surface of the uppermost spacer 160A and the lower surface of the lowermost spacer 160E are formed in the recesses 162 for fitting the fastening members. The spacer 160E has an output terminal 166 electrically joined to the electrode terminal 147 through the bus bar 196, and the spacer 160B has an output terminal 167 electrically joined to the electrode terminal 147. Each output terminal protrudes from openings 132 and 133 provided on the case front surface 123.

  As shown in FIG. 9C, the fastening member 170 has a U-shaped longitudinal section including a main body base portion 172 and upper and lower side surface portions 190, and sandwiches the spacer 160 of the laminated body from above and below by both side surface portions 190. The main body base 172 has openings 174 and 175 in the vicinity of both sides and an insertion port 176 in the center. The openings 174 and 175 can project the output terminals 166 and 167 and have projecting portions 184 and 185 extending to the edge. The protruding portions 184 and 185 have a cylindrical wall portion 186 and an extended portion 188 at the tip thereof, and protrude from the opening portions 132 and 133 of the case as shown in FIG.

  In the cell unit 140, the flat batteries 144A to 144D are stacked in a non-contact state at the front and rear portions via the spacers 160 and 161, and the stacked body 142 is the fastening member 170 (the fastening member on the spacer 161 side is omitted). Are integrally restrained. That is, in the cell unit 140, with the fastening member 170 inserted into the openings 174 and 175 with respect to the laminate 142, the upper and lower side surfaces 190 are recessed on the outer surface side of the uppermost spacers 160A and 160E. By being fitted to 162, the restraint is integrated. Note that the cell unit 140 is housed in the case 120 from the constrained state and is created as the battery module 100. The battery modules 100 are stacked in the required number according to the use or specifications, and are connected by fixing means such as bolts inserted into the case side through holes 130 and the spacer side through holes 164 and 165 as the assembled batteries. Built.

JP 2007-172893 A

  In the cell unit described above, the laminate is constrained to a state in which the spacers at the front and rear portions are integrated by the fastening member, but it is stored in a case as a battery module or built as a battery pack. A flat battery or spacers may move in a minute amount and cause a failure such as electrical connection. As a countermeasure, for example, in addition to the fastening member, it is conceivable to reinforce the binding force on the laminated body by other coupling means. However, the number of members and the number of assembly steps increase, which makes it difficult to employ.

  The present invention has been devised from the above problems. The purpose is to be able to restrain flat batteries or spacers more securely and firmly without increasing the number of members and assembly man-hours, thereby improving the quality of the battery module cell unit.

  In order to achieve the above object, according to the first aspect of the present invention, a laminated body in which each of a plurality of flat batteries is sandwiched from above and below by a spacer and laminated in a non-contact state is constrained by each of the spacers by a fastening member. In the fastening structure of the battery module cell unit integrated by the above, the fastening member has a substantially U-shaped longitudinal section, and has an engaging portion provided on the opposing inner surface. The spacers are clamped between the engaging portions and portions facing the engaging portions in a state of being arranged between the opposing inner surfaces, and the movement of the spacers is restricted.

  In the present invention described above, the “engagement portion provided on the opposing inner surface” refers to the first configuration in which the engagement portions 25 and 26 are provided on the opposing inner surface as shown in the partial enlarged view of FIG. (B) and the 2nd structure which provided the engaging part 25 only in one side of the opposing inner surface. In the case of the first configuration, “holding each spacer between the engaging portion and a portion facing the engaging portion” means that each spacer is connected between the engaging portion 25 and the engaging portion 26. It becomes the structure to clamp. In the case of the second configuration, each spacer is sandwiched between one engaging portion 25 and the side portion 21 that is not provided with the engaging portion 25 among the U-shaped side portions constituting the fastening member. It becomes composition.

The present invention as described above is more preferably embodied as in the second to sixth aspects. That is,
(A) The invention of claim 2 is characterized in that, among the spacers, an engagement portion is provided in a spacer arranged at the lowermost stage, and at the same time the spacers are sandwiched between the fastening members, The engaging member is engaged, and the fastening member clamps the spacers in an engaged state between the engaging portion and the engaged portion.
(A) The invention according to claim 3 is a structure which also serves as an insulating cover arranged to cover the outside of the spacer.
(C) The invention of claim 4 is provided with positioning means that are provided on the spacer and the insulating cover, and are fitted to each other when the insulating cover is assembled to the spacers.

(D) The invention of claim 5 specifies the fastening member used in the fastening structure of the battery module cell unit described above. That is, any one of a plurality of flat batteries is sandwiched from above and below by a spacer and laminated in a non-contact state to be integrated by restraining each spacer. The fastening member as described.
(E) The invention of claim 6 has a configuration in which curved portions are provided at the left and right ends in the longitudinal direction and cover a part of both side surfaces that are in contact with the outer end surfaces of the spacers.

  In the first aspect of the present invention, in a state where each spacer is sandwiched between the inner side of the U-shaped fastening member, each of the engagement members provided on one of the opposed inner surfaces and a portion facing the engagement portion Since the spacers are further clamped, the positions of the spacers can be more reliably regulated. Thereby, in this structure, a flat battery or spacers can be restrained more reliably and firmly without increasing the number of members or increasing the number of assembly steps.

  According to the second aspect of the present invention, since each of the spacers is sandwiched in the U-shape of the fastening member, the engaged portion provided on the uppermost spacer and the fastening member side engaging portion are in an engaged state. In addition to the restricting force that holds the members together in the U-shape of the fastening member, it is possible to apply the restricting force in the left and right and up and down directions due to the engagement between the engaging portion and the engaged portion, thereby reliability of the cell unit for the battery module And quality can be improved.

  In the invention of claim 3, since the fastening member also serves as an insulating cover arranged so as to cover the outer side of each spacer, it can be easily implemented without increasing the number of members.

  In the invention of claim 4, when the insulating cover is assembled to each spacer, the positioning means can be fitted to each other to prevent positional displacement and can be restrained and integrated with high accuracy.

  The invention according to claim 5 can provide the advantages as described in the inventions of claims 1 to 4 as a fastening member for constraining the laminated body or spacers of the flat battery constituting the cell unit for the battery module.

  In the invention of claim 6, a more stable assembled state can be obtained with respect to the laminated body or each spacer by the presence of the curved portions that are provided at the left and right ends in the longitudinal direction and cover a part of both side surfaces of each spacer. It is done.

The cell unit for battery modules of this invention form is shown, (a) is the top view of the cell unit, (b) is the front view seen from the front of the cell unit. (A), (b), (c) is the expanded sectional view which followed the AA line of FIG. 1, BB line, and CC line. FIG. 2 is an enlarged cross-sectional view taken along line DD in FIG. 1 and a partially enlarged view thereof. (A), (b) is the principal part exploded view which shows typically the relationship between the laminated body which comprises the cell unit for battery modules, and a fastening member, and the elements on larger scale. It is a block diagram which shows the spacer which comprises the said laminated body. The detail of the said fastening member is shown, (a) is the perspective view seen from the back side, (b) is the expanded sectional view cut along the EE line. (A) And (b) is a figure which shows the modification 1 corresponding to FIG. 2 (a) and FIG.6 (b). (A) is the figure which shows the modification 2 and (b) shows the modification 3 corresponding to the partial enlarged view of FIG. 3, respectively. The battery module cell unit disclosed in Patent Document 1 is shown, (a) and (b) are perspective views of the battery module and the cell unit, and (c) are perspective views of a fastening member. (A) is an exploded view of the cell unit of FIG. 8, (b) is a block diagram of the laminated body of a flat battery.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this description, the outline of the battery module cell unit shown in FIGS. 1 to 6, the fastening structure and its advantages, Modification 1 shown in FIG. 7, Modifications 2 and 3 shown in FIG. 8 will be described in detail. . In the description of the modified examples 1 to 3, the same members and parts as those in the structures of FIGS. 1 to 6 are denoted by the same reference numerals, and only the changes are described in detail.

(Summary) The battery module cell unit 5 shown in FIGS. 1 to 3 includes a plurality of flat-type batteries 1A to 1D each having a front spacer 3A to 3E and a rear spacer (not shown). The laminated body 4 sandwiched from above and below and laminated in a non-contact state, and the front spacers 3A to 3E and the fastening members 2A and 2B that also serve as insulating covers for restraining the rear spacers, as shown in FIG. Same as conventional in that it is housed in a metal case and made as a battery module.

  The contrivance is particularly in the fastening structure when the laminate 4 of FIG. 4 is produced as the battery module cell unit 5 by restraining the spacers by the fastening members 2A and 2B. Here, the fastening members 2A and 2B are the same in that both have a substantially U-shaped vertical cross section and have engaging portions 25 and 26 provided on the inner surface of the opposite side. In this fastening structure, the fastening member 2A sandwiches the front spacers 3A to 3E, and the fastening member 2B sandwiches the rear spacers between the U-shaped opposed inner surfaces, and the spacers are used as engaging portions. Of the U-shaped side portions 21 of the U-shaped side portions 21 constituting the fastening member in the case of FIG. The movement of the laminated body 4 or each spacer is regulated by being sandwiched by the side part 21) not provided with the part 25.

  Each of the flat batteries 1A to 1D (1) is a lithium ion secondary battery or the like, and includes a power generation element (not shown) and front and rear end electrode terminals 10 (see FIG. 2) connected to the power generation element, It consists of the exterior material 11 (refer FIG. 1) etc. which has covered the electric power generation element. In FIG. 4, each flat battery 1A-1D is modeled, and the exterior material 11 is abbreviate | omitted in FIG.2, FIG7 and FIG.8.

  In the following description, the fastening members 2A and 2B (2) have the same fastening structure, so the details of the fastening member 2B are omitted, and the detailed configuration of the fastening member 2A is clarified. The front spacers 3A to 3E (3) and the rear spacers differ in shape depending on the presence or absence of output terminals, etc., but the fastening structure is the same, so the rear spacers are omitted. The detailed configuration is clarified in each of the front spacers 3A to 3E. Reference numeral 1 is used when any of the flat batteries 1A, 1B, 1C, and 1D is applicable. Reference numeral 2 is used when applied to both the fastening member 2A and the fastening member 2B regardless of whether the fastening member 2A or the fastening member 2B is used. Reference numeral 3 is used when any of the spacers 3A, 3B, 3C, 3D, and 3E is applicable.

(Fastening structure) The laminated body 4 of FIG. 4 is laminated in a non-contact state by sandwiching the flat batteries 1A to 1D one by one by the front spacers 3 and the rear spacers (not shown). Yes. The fastening members 2 </ b> A and 2 </ b> B are assembled to the front and rear spacers by pushing in, and the front and rear spacers are constrained so that the laminate 4 is integrated and can be formed as a battery module cell unit 5.

  FIG. 5 shows details of the spacers 3A to 3E. Each spacer 3 is an injection-molded product of resin and has a length corresponding to the width of the flat battery 1. The uppermost spacer 3A and the lower spacer 3B sandwich the electrode terminal 10 of the flat battery 1A from above and below, and the spacer 3B and the lower spacer 3C sandwich the electrode terminal 10 of the flat battery 1B from above and below. 3C and the lower spacer 3D sandwich the electrode terminal 10 of the flat battery 1C from above and below, and the spacer 3D and the lowermost spacer 3E sandwich the electrode terminal 10 of the flat battery 1D from above and below.

  Each spacer 3 is provided with a plurality of cutout portions 33 or 33 a that cut out the front portion to expose a part of the electrode terminal 10. At both ends 30 of the spacers 3A and 3E and both ends 31 of the spacers 3B to 3D, through holes 34 that are continuous in the vertical direction are provided as shown in FIG. In this structure, the lower cylindrical portion 30a corresponding to the through-hole 34 of the spacer 3A is fitted into the large-diameter upper portion 34a of the through-hole 34 of the spacer 3B, and corresponding to the through-hole 34 of the spacer 3B. The lower cylinder portion 31a is fitted into the upper diameter large hole portion 34a of the through hole 34 of the spacer 3C, and the lower cylinder portion 30a corresponding to the through hole 34 of the spacer 3C is inserted into the through hole 34 of the spacer 3D. And a continuous through hole 34 in a state in which a cylindrical portion 31a provided corresponding to the through hole 34 of the spacer 3D is fitted to the large diameter hole portion 34a of the spacer 3E. It has become. In addition, since each spacer 3 is laminated on both sides through fitting of the cylindrical portion 30a and the large-diameter hole portion 34a, the vertical and horizontal movements are restricted for the time being.

  Also, the spacers 3A and 3E are provided in a central portion of the outer surface and serve as both a positioning means and a locking means, and a concave portion 38 that is also provided outside the both end portions 30 and serves as a positioning means and a locking means. have. Note that the concave portion 39 on the spacer 3E side and the concave portion 38 on the left side in FIG. The spacer 3B is provided with an arrangement portion 37a for positioning the output terminal 14. The output terminal 14 is connected to the electrode terminal 10 of the flat battery 1A disposed between the spacers 3A and 3B and the electrode terminal 10 of the flat battery 1B disposed between the spacers 3B and 3C. 13a and 13b are formed. The spacer 3D is provided with an arrangement portion 38a for positioning the output terminal 12 and an opening 38b. The output terminal 12 is a connecting portion connected to the electrode terminal 10 of the flat battery 1C disposed between the spacers 3C and 3D and the electrode terminal 10 of the flat battery 1D disposed between the spacers 3D and 3E. 11a and 11b are formed. In the spacers 3B to 3E, the bus bar 16 is disposed along the left notch 33 or 33a. The bus bar 16 is formed in a staircase shape so as to be connectable to the electrode terminals 10 of the flat batteries 1A to 1D, and the positioning member is positioned in a state where the uppermost flat plate portion is disposed between the spacers 3A and 3B. The lowermost flat plate portion 16a is disposed on the left notch 33 of the spacer 3E. These are similar to the spacer configuration disclosed in Patent Document 1.

  The most different point from the prior art is that the spacer 3 </ b> A has a receiving portion 35 as an engaged portion provided inside the both end portions 30, and the spacer 3 </ b> E is engaged inside the both end portions 30. It has the receiving part 36 as a part. The receiving part 35 and the receiving part 36 are provided on substantially the same line. Further, the receiving portions 35 on both sides are substantially concave in a side view and face each other with a predetermined distance. The receiving portions 36 on both sides have an inverted concave shape in a side view and face each other with a predetermined distance. The length of each receiving part 35 is a dimension which contacts the upper corresponding part of the intermediate spacer 3C through the notch 33a of the spacer 3B as shown in FIG. The length of each receiving part 36 is a dimension which contacts the lower side corresponding part of intermediate spacer 3C through notch 33a of spacer 3D.

  FIG. 6 shows details of the fastening member 2A. The fastening member 2A is an injection-molded product of resin and has a container shape having a size corresponding to each spacer 3 of the laminate 4 in FIG. That is, the fastening member 2A has a substantially U-shaped longitudinal section composed of an intermediate portion 20 and upper and lower side portions 21, and has curved portions 22 provided at the left and right ends in the longitudinal direction. Almost all the spacers 3 constituting the body 4 can be accommodated inside. The outer surface of the intermediate portion 20 has a substantially rectangular tube portion 23 projecting according to each output terminal 12, 14 of the spacer 3, and the output terminal 12, 14 can protrude outward from the corresponding tube portion 23. It has become. On the upper and lower side portions 21 facing each other, a through hole 24 penetrating on the coaxial line is provided in the vicinity of the left and right curved portions 22. Each through hole 24 is overlapped with the through hole 34 of each spacer in the state of the cell unit 5 in which the fastening member 2 </ b> A is attached to each spacer 3.

  On the inner surfaces of the upper and lower side portions 21, rectangular piece portions 25 and 26 are provided as engaging portions slightly closer to the center than the left and right through holes 24. The piece part 25 and the piece part 26 are opposed to each other in the vertical direction, and extend to substantially the front and rear of the side part 21 in a state where the rear surface and the upper or lower surface are joined to the intermediate part inner surface and the side part inner surface. The corner portions on the front side of the pieces 25 and 26 are formed on the inclined surfaces 25a and 26a. When the fastening member 2A is attached to each spacer 3, it is inserted into the corresponding receiving portions 35 and 36 on the spacer side. It is easy.

  Further, on the inner surface of the intermediate portion 20, vertical ribs 27 are provided slightly closer to the center than the one side pieces 25, 26. The vertical rib 27 extends directly above the left-side cutout 33 of the spacer 3E, and abuts against the lowermost flat plate portion 16a that is the free end of the bus bar 16 as shown in the partially enlarged view of FIG. The swing of the is regulated. Further, each of the left and right curved portions 22 has a convex portion 28 on the inner surface as shown in FIG. 6B and is provided slightly below the upper and lower side portions 21. Similarly, the upper and lower side surfaces 21 have claw portions 29 on the inner surface and provided in the middle of the left and right sides. Each convex portion 28 forms positioning means or locking means with the corresponding concave portions 38 of the spacers 3A and 3E. Each nail | claw part 29 comprises the positioning means or the latching means with the recessed part 39 to which spacer 3A, 3E respond | corresponds.

(Advantages) The above fastening member 2A is assembled to each spacer 3 constituting the laminate 4 of FIG. 4 by pushing operation in the direction of the arrow in FIG. Integrate as a constraint. Although this operation itself is the same as the conventional one, the above fastening structure realizes the following advantages over the conventional structure.

First, in this fastening structure, when the fastening member 2A is attached to each spacer 3 or the laminated body 4 by pushing operation, in the final stage, each convex part 28 on both sides is provided with the corresponding concave part 38 on the spacer side and the intermediate part. Since each nail | claw part 29 elastically engages with the corresponding recessed part 39 by the side of a spacer, even if the width dimension of the cell unit 5 for battery modules is large, the fastening member 2A can be attached to each spacer 3 with high precision. Further, since each claw portion 29 is accompanied by a clicking sound when it is elastically engaged with the corresponding concave portion 39, it is possible to judge the completion of the mounting of the fastening member 2A to each spacer 3 by the sound.

Secondly, in addition, in this fastening structure, in the process in which the fastening member 2A is attached to each spacer 3, the upper and lower pieces 25, 26 provided on the left and right sides of the fastening member are the corresponding receiving portions 35, on the spacer side. 36. As a result, the upper and lower pieces 25 and 26 on both sides are respectively fitted to the corresponding left and right receiving portions 35 and 36 as inferred from the partially enlarged view of FIG. Therefore, the position of the uppermost spacer 3A and the lowermost spacer 3E is reliably regulated by the pieces 25 and 26 fitted to the receiving portions 35 and 36. At the same time, the other spacers 3B to 3D are sandwiched from above and below by the position-restricted uppermost spacers 3A and 3E, and the positions of the left and right and up and down movements are reliably regulated. As a result, in this fastening structure, the flat battery or the spacers can be restrained more reliably and firmly without increasing the number of members or increasing the number of assembly steps.

(Modification 1) Modification 1 of FIG. 7 is an example in which the shape of the piece portion 25 which is the above-described engaging portion is changed. As shown in FIG. 7B, the piece 25A has a surface facing the piece 26 formed on the inclined surface 25b. The inclined surface 25b is set to a taper that gradually increases the distance from the opposing surface of the piece portion 26 as the distance from the intermediate portion 20 increases. For this reason, in this fastening structure, when the fastening member 2A is mounted on each spacer 3, as shown in FIG. 7A, the half portion 25 is the lowermost portion of the inclined surface 25b with respect to the receiving portion 35. A portion close to 20 is locally pressed. As a result, in this fastening structure, the pressing force between the piece portion 25 and the piece portion 26 is increased by pressing the piece portion 25 against the receiving portion 35, so that the spacers can be restrained more firmly. As another example, a similar inclined surface may be formed on the one portion 26 or a similar inclined surface may be formed on the receiving portion 35 or 36 side.

(Modification 2) Modification 2 of FIG. 8A is an example in which the shapes of the receiving portions 35 and 36 are changed. In the second modification, the receiving portions 35a on both sides are substantially L-shaped in a side view and face each other with a predetermined distance. The receiving portions 36a on both sides are reverse L-shaped in a side view and face each other with a predetermined distance. In this fastening structure, the left and right receiving portions 35a provided on the spacers 3A and 3E are provided with the side portions 25 on both sides even if the receiving portions 35a and 36a have a simpler shape than those shown in FIGS. Therefore, the fine movement of the spacers in the left-right direction can be regulated to the same extent as in the above embodiment.

(Modification 3) Modification 3 of FIG. 8B is an example in which one of the above-described pieces 25 and 26 and one of the receiving parts 35 and 36 corresponding thereto are omitted. In the third modification, the side portions 25 on both sides and the receiving portions 35 to which they are fitted are the same as in the above embodiment. The piece portions 26 on both sides and the receiving portions 35 fitted to the two portions are omitted. In addition, the spacer 3E is formed with an overhanging portion 36b instead of the receiving portion 36 of the above form. And even if this fastening structure is simplified by omitting one of the pieces 25 and 26 and one of the receiving portions 35 and 36 corresponding thereto, the piece 25 in which each spacer 3 is fitted to the receiving portion 35 and The flat battery or the spacers can be securely and firmly secured without increasing the number of members or the number of assembling steps because they are sandwiched between the side portion 21 constituting the fastening member facing the piece portion 25. Can be restrained. As described above, the present invention only needs to have the configuration specified in the claims, and the details can be variously changed as necessary.

1A to 1D: flat battery (10 is an electrode terminal, 11 is an exterior material)
2A, 2B ... Fastening member (20 is an intermediate part, 21 is a side part, 22 is a curved part, 24 is a through hole)
3A to 3E ... Spacers (30 and 31 are end portions, 34 is a through hole)
4 ... Laminated body 5 ... Cell unit for battery module 25, 26 ... Single part (engagement part)
25A: One part (engagement part)
35, 36 ... receiving part (engaged part)
35a, 36a ... receiving part (engaged part)
38, 39... Recess (used as positioning means and locking means)

Claims (6)

Fastening structure for cell unit for battery module, in which each of a plurality of flat batteries is laminated in a non-contact state by sandwiching each flat battery from above and below by constraining each spacer with a fastening member In
The fastening member has a substantially U-shaped longitudinal cross section and has an engaging portion provided on the opposing inner surface, and the spacers are disposed in the state where the spacers are disposed between the opposing inner surfaces. A battery module cell unit fastening structure characterized in that the movement of each spacer is regulated by being sandwiched between an engaging portion and a portion facing the engaging portion.   Among the spacers, an engagement portion is provided in a spacer arranged at the uppermost lower stage, and at the same time as each spacer is sandwiched between the fastening members, the engagement portion engages with the engagement portion, The fastening structure for a battery module cell unit according to claim 1, wherein the fastening member clamps each spacer in an engaged state between the engaging portion and the engaged portion.   The fastening structure for a battery module cell unit according to claim 1 or 2, wherein the fastening member also serves as an insulating cover arranged so as to cover the outside of the spacer.   4. The battery module cell unit according to claim 3, further comprising positioning means provided on the spacer and the insulating cover so as to be fitted to each other when the insulating cover is assembled to the spacers. Fastening structure.   5. The laminate according to any one of claims 1 to 4, wherein a laminated body in which each of the plurality of flat batteries is sandwiched from above and below by a spacer and laminated in a non-contact state is integrated by restraining each spacer. Fastening member.   The fastening member according to claim 5, further comprising a curved portion that is provided at left and right ends in the longitudinal direction and covers a part of both side surfaces that are in contact with the outer end surface of the spacer.

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