JP2018018672A - Method for manufacturing battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a battery module, capable of suppressing the positional deviation of a member to be stacked.SOLUTION: A method for manufacturing a battery module includes: a compression step of compressing an elastic member 8 along a first direction such that a plastic deformation component is generated in the elastic member 8; a stacking step of, after the compression step, configuring a stacked body 6 by stacking a plurality of battery cells 9 and the elastic member 8 to each other along the first direction; and an integration step of, after the stacking step, integrating by restraining the stacked body 6 along the first direction by using end plates 7. The elastic member 8 has a main surface 8S, and the first direction is a direction crossing the main surface 8S.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a method for manufacturing a battery module.

  Patent Document 1 describes a power storage module. The power storage module includes a stacked body in which frame members for holding a plurality of power storage cells are stacked, a restraining member for restraining the power storage cells and the stacked body in a stacking direction, and an elastic member having elasticity. ing.

JP 2009-81056 A

  When manufacturing an electricity storage module as described above, for example, in order to absorb expansion of the electricity storage cell by the elastic member, the elastic member is restrained together with the electricity storage cell using the restraining member. At this time, when pressure is applied to the elastic member by the restraining member, the elastic member may be deformed in a shearing direction perpendicular to the direction in which the pressure is applied. As a result, there is a possibility that misalignment of other stacked members (for example, storage cells or restraining members) in contact with the elastic member may occur.

  This invention is made | formed in view of such a situation, and makes it the subject to provide the manufacturing method of the battery module which can suppress the position shift of a laminated member.

  In order to solve the above problems, a battery module manufacturing method according to the present invention includes a stacked body including a plurality of battery cells and elastic members stacked on each other, and a restraining member that restrains the stacked body. A compression step of compressing the elastic member along the first direction so that a plastic deformation component is generated in the elastic member, and after the compression step, the plurality of battery cells and the elastic member along the first direction. And laminating each other to form a laminate, and after the lamination step, an integration step of constraining the laminate by restraining the laminate along the first direction using a restraining member. The member has a main surface, and the first direction is a direction intersecting the main surface.

  In this battery module manufacturing method, first, the elastic member is compressed along the first direction so that a plastic deformation component is generated in the elastic member. By this step, at least a part of the elastic member is in a state where plastic deformation has occurred in the first direction and the shear direction intersecting the first direction. Therefore, in the subsequent process, when the laminated body including the elastic member is configured and integrated by restraint, the elastic member is prevented from being deformed in the shearing direction again. Therefore, the position shift of another laminated member (battery cell or restraining member) in contact with the elastic member is suppressed. Here, “plastic deformation component is generated” in the elastic member means that at least a part of the elastic member is plastically deformed, for example.

  In the battery module manufacturing method according to the present invention, in the compression step, the elastic member is compressed by sandwiching the elastic member along the first direction by the pair of pressure members, and the elastic member is sandwiched by the pair of pressure members. In this state, at least one of the pressure members may be supported in a movable state in a plane direction that intersects the first direction. In this case, at the time of compression of the elastic member, at least one of the pressure members can follow the deformation of the elastic member in the plane direction (the shear direction of the elastic member) intersecting the first direction. For this reason, the elastic member can be plastically deformed more effectively in the shearing direction.

  In the battery module manufacturing method according to the present invention, in the compression step, the elastic member is compressed so that an elastic deformation component and a plastic deformation component are generated in the elastic member, and the compression amount for compressing the elastic member in the compression step is integrated. It may be larger than the compression amount for compressing the elastic member by restraint in the process. In this case, since the elastic member is more greatly compressed in the previous stage (compression process) of the integration process, the elastic member effectively suppresses deformation in the shearing direction of the elastic member during the integration process. Can do. Here, the “compression amount” is a deformation amount of the elastic member in the first direction based on the dimension of the elastic member in the natural state in the first direction. Further, “elastic deformation component and plastic deformation component occur” in the elastic member here means that, for example, a part of the elastic member is plastically deformed and the remaining part is elastically deformed.

  In the battery module manufacturing method according to the present invention, the elastic member may include foamed rubber. Thus, even if the elastic member includes foamed rubber, deformation in the shearing direction of the elastic member in the integration process can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the battery module which can suppress the position shift of a to-be-laminated member is provided.

It is a perspective view which shows the battery module which concerns on this embodiment. It is sectional drawing which shows the state by which the battery module shown by FIG. 1 was fixed to the external component. FIG. 2 is an exploded perspective view of the battery unit shown in FIG. 1. (A) is a figure which shows the elastic member before a compression process, (b) is a figure which shows the state in which the elastic member was installed in the pressurization apparatus. (A) is a figure which shows the state by which the elastic member was compressed with the pressurization apparatus, (b) is a figure which shows the elastic member after a compression process. It is a figure which shows the laminated body in a lamination process. It is sectional drawing which shows the modification of a pressurization apparatus.

  Hereinafter, an embodiment of a battery module manufacturing method will be described in detail with reference to the drawings. In addition, in each drawing, the same code | symbol is attached | subjected to the same or an equivalent part, and the overlapping description may be abbreviate | omitted in description of drawing. In the following drawings, an orthogonal coordinate system including an X axis, a Y axis, and a Z axis may be shown.

  FIG. 1 is a perspective view showing a battery module according to the present embodiment. FIG. 2 is a cross-sectional view showing a state where the battery module shown in FIG. 1 is fixed to an external component. As shown in FIGS. 1 and 2, the battery module 1 includes a stacked body 6 including a plurality of (for example, seven) battery units 5 and an elastic member 8 stacked on each other along a first direction (X-axis direction). And a pair of end plates (restraining members) 7 disposed on both end sides in the first direction of the laminated body 6.

  Each battery unit 5 includes a single battery cell 9. That is, the stacked body 6 includes a plurality of battery cells 9 (same number as the battery units 5, for example, 7) stacked on each other along the first direction. The elastic member 8 is located on one end side in the first direction of the laminated body 6 and is disposed between the battery unit 5 and the end plate 7. The battery cell 9, the elastic member 8, and the end plate 7 are stacked members that are stacked on each other along the first direction.

  The battery module 1 is fixed to the wall surface 2S of the external component 2 by a fixing member such as a plurality of bolts B via the end plate 7, for example. The external component 2 is, for example, a battery pack housing including one or a plurality of battery modules 1, and the wall surface 2S is, for example, the inner surface of the housing. A heat conducting member 4 and a slip sheet 3 are interposed between the battery module 1 and the wall surface 2S. Here, as an example, between the battery module 1 and the wall surface 2S, there are a plurality (same as the number of battery units 5, for example, seven) of heat conduction members 4 and a plurality (same as the number of battery units 5). Yes, for example, 7) slip sheets 3 are arranged. However, the single heat conductive member 4 and the slip sheet 3 may be interposed between the battery module 1 and the wall surface 2S. Note that the slip sheet 3 may not be disposed between the battery module 1 and the wall surface 2S.

  The heat conducting member 4 is in contact with the wall surface 2S through the slip sheet 3. The heat conducting member 4 and the slip sheet 3 are arranged for each battery unit 5. Thereby, the heat generated in the battery cell 9 is radiated to the external component 2 through a heat transfer surface 23a (see FIG. 3) of the heat transfer plate 11 described later, the heat conductive member 4, and the slip sheet 3. When the external component 2 is a battery pack housing, the external component 2 has a rectangular box shape, for example, and is formed of a metal such as iron or aluminum.

  The heat conducting member 4 is formed of a material having adhesiveness such as silicon, acrylic, or urethane, for example. In addition, the heat conductive member 4 may not have adhesiveness, for example, may be joined to the heat-transfer plate 11 and / or the slip sheet 3 using a double-sided tape etc. When the slip sheet 3 is not used as described above, the heat conducting member 4 may be in direct contact with the wall surface 2S.

  The slip sheet 3 enables the heat conducting member 4 to move relative to the external component 2. The slip sheet 3 is made of a resin having thermal conductivity such as polyethylene terephthalate (PET) and having a low friction coefficient. The slip sheet 3 may contain a heat conductive filler.

  FIG. 3 is an exploded perspective view of the battery unit shown in FIG. As shown in FIGS. 2 and 3, the battery unit 5 includes a battery cell 9, a cell holder 10 that holds the battery cell 9, and a heat transfer plate 11 that is disposed so as to contact the battery cell 9. ing. The battery cell 9 is a lithium ion secondary battery including, for example, a rectangular parallelepiped case 12 and an electrode assembly (not shown) accommodated in the case 12. The electrode assembly includes a plurality of positive electrode sheets (not shown), a plurality of negative electrode sheets (not shown), and a separator (not shown) disposed between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet are alternately laminated via separators.

  The case 12 includes a pair of side surfaces 12a and 12b that intersect the second direction (Y-axis direction), a pair of side surfaces 12c and 12d that intersect the first direction, and an upper surface 12e that intersects the third direction (Z-axis direction). And the lower surface 12f. The second direction is a direction intersecting the first direction, and the third direction is a direction intersecting the first direction and the second direction. A positive electrode terminal 13 and a negative electrode terminal 14 are attached to the upper surface 12 e of the case 12 via an insulating ring 15. The positive terminal 13 is electrically connected to the positive sheet, and the negative terminal 14 is electrically connected to the negative sheet.

  The cell holder 10 is a frame-shaped member made of, for example, resin. The cell holder 10 includes a bottom wall portion 16 on which the battery cell 9 is placed, a pair of side wall portions 17a and 17b that are erected from both ends of the bottom wall portion 16 and sandwich the battery cell 9 in the second direction, and a side wall portion 17a. , 17b.

  In the cell holder 10, a rectangular parallelepiped space in which the battery cells 9 are fitted is defined by the bottom wall portion 16, the side wall portions 17 a and 17 b, and the connecting portion 18. When the battery cell 9 is fitted in this space, the bottom wall portion 16 faces the lower surface 12 f of the case 12. Further, the side walls 17a and 17b face the side surfaces 12a and 12b of the case 12, respectively. Further, the connecting portion 18 faces the side surface 12 d of the case 12.

  A terminal accommodating portion 19 that surrounds a part of the positive electrode terminal 13 and the negative electrode terminal 14 of the battery cell 9 is provided at the upper part of both ends of the connecting portion 18. A bolt guide portion 20 is provided in the upper portion of the connecting portion 18 on the inner side in the second direction than the terminal accommodating portion 19. The bolt guide portion 20 is provided with a through hole 20a extending in the first direction. In addition, bolt guide portions 21 are provided at lower portions of both end portions of the bottom wall portion 16. The bolt guide portion 21 is provided with a through hole 21a extending in the first direction. A shaft portion of a bolt 24 described later is inserted through each of the through hole 20a and the through hole 21a.

  The heat transfer plate 11 includes a rectangular plate-shaped main body portion 22 and a rectangular plate-shaped extending portion 23 extending from the main body portion 22 along the first direction. The heat transfer plate 11 is formed in an L shape by the main body portion 22 and the extending portion 23. The main body 22 is in contact with the side surface 12d of the battery cell 9 (case 12). The extending portion 23 is disposed on the side surface 12 a via the side wall portion 17 a of the cell holder 10. The surface of the extending portion 23 opposite to the surface on the side surface 12 a side is thermally connected to the external component 2. Therefore, the heat transfer plate 11 thermally connects the battery cell 9 and the external component 2. That is, the surface opposite to the surface on the side surface 12 a side of the extending portion 23 is a heat transfer surface 23 a that is provided in each of the battery cells 9 and thermally connects the battery cell 9 and the external component 2.

  The end plate 7 restrains the multilayer body 6 from both end sides in the first direction of the multilayer body 6. The end plate 7 is formed in an L-shaped plate shape by a rectangular plate-shaped restraining portion 7p and a rectangular plate-shaped fixing portion 7r. The restraint portions 7p are fastened to each other by fastening members such as bolts 24 and nuts 25 in a state where the stacked body 6 is sandwiched. More specifically, the bolt 24 is inserted into the through holes 20 a and 21 a of the cell holder 10 that holds the battery cell 9 and the through holes provided in the end plate 7.

  The nut 25 is screwed to the end of the bolt 24 so that the end plates 7 are fastened to each other. As a result, the end plate 7 applies a restraining load to the stacked body 6. That is, the elastic member 8 is restrained by the end plate 7 together with the plurality of battery units 5 (battery cells 9). For example, when the battery cell 9 expands, the elastic member 8 is compressed so as to absorb the expansion of the battery cell 9. The elastic member 8 is made of a material including, for example, foam rubber.

  The fixing portion 7r is fastened to the external component 2 by inserting the bolt B through the insertion hole 7a in a state where the fixing portion 7r is in contact with the wall surface 2S of the external component 2. Thereby, the fixing part 7r fixes the battery module 1 to the external component 2.

  Next, a method for manufacturing the battery module 1 according to this embodiment will be described. In this manufacturing method, first, the elastic member 8 is compressed so that a plastic deformation component is generated in the elastic member 8 along the first direction (compression step). Next, a stacked body 6 is formed by stacking a plurality of (for example, seven) battery units 5 (battery cells 9) and the elastic member 8 along the first direction (stacking step). And after a lamination process, it unifies by constraining the laminated body 6 using the end plate 7 along a 1st direction (integration process). Hereinafter, each step will be described. Here, the first direction is defined on the basis of the elastic member 8 as a direction intersecting a main surface 8s of the elastic member 8 described later. Therefore, the first direction here does not need to coincide with the X-axis direction in FIGS.

  With reference to FIG.4 and FIG.5, a compression process is demonstrated. In the compression step, the elastic member 8 is compressed using a pressure device. FIG. 4A is a view showing the elastic member before the compression step, and FIG. 4B is a view showing a state in which the elastic member is installed in the pressure device. FIG. 5A is a view showing a state where the elastic member is compressed by the pressurizing device, and FIG. 5B is a view showing the elastic member after the compression step.

  As shown in FIG. 4A, first, the elastic member 8 is prepared here. The elastic member 8 has a rectangular parallelepiped shape and has a main surface 8S. The main surface 8S is a surface in contact with the battery unit 5 or the end plate 7 in the battery module 1. The main surface 8S of the elastic member 8 defines a first direction as a direction intersecting the main surface 8S. That is, the first direction is a direction intersecting (for example, orthogonal to) the main surface 8S. Hereinafter, the dimension of the elastic member 8 in the first direction is referred to as the thickness of the elastic member 8. And let D1 be the thickness of the elastic member 8 in a natural state (a state before the compression step and a state in which no substantial deformation has occurred). In addition, the planar direction intersecting the first direction (that is, the direction along the main surface 8S) may be described as the shearing direction of the elastic member 8.

  In the compression step, the elastic member 8 is compressed using a pressurizing device 50 as shown in FIG. The pressure device 50 includes a pair of pressure members 51A and 51B. The pressing member 51A is, for example, a plate shape and includes a main surface 51a. The pressurizing member 51B has, for example, a plate shape and includes a main surface 51b facing the main surface 51a. The pressurizing device 50 further includes a drive unit 52 that drives the pressurizing member 51A along a direction intersecting the main surfaces 51a and 51b, and a support unit 53 that supports the pressurizing member 51B.

  The pressing member 51B is supported by the support portion 53 in a state where it can move in the direction along the main surfaces 51a and 51b. More specifically, for example, a plurality of free bear balls 54 are arranged on one surface of the support portion 53. The pressurizing member 51B is supported by the support portion 53 in a state where it is in contact with the ball 54. Thereby, the pressurizing member 51 </ b> B is movable in the direction along the main surfaces 51 a and 51 b by the rotation of the ball 54. Note that a member capable of reducing friction, such as a slip sheet, may be disposed on one surface of the support portion 53 instead of the free bear ball 54.

  In the compression step, the elastic member 8 is disposed in the pressurizing device 50 as described above. More specifically, in a posture where the main surface 8S of the elastic member 8 is along the main surfaces 51a and 51b of the pressure members 51A and 51B, the elastic member 8 is sandwiched between the pressure member 51A and the pressure member 51B. The elastic member 8 is disposed in the pressure device 50. Therefore, the first direction coincides with the direction intersecting the main surfaces 51a and 51b, and the plane direction (shear direction) intersecting the first direction coincides with the direction along the main surfaces 51a and 51b. Therefore, the elastic member 8 is sandwiched along the first direction by the pair of pressure members 51A and 51B. Further, the pressing member 51B is supported in a movable state in a plane direction intersecting the first direction in a state where the elastic member 8 is sandwiched between the pair of pressing members 51A and 51B.

  Next, as shown in FIG. 5A, the elastic member 8 is compressed using the pressurizing device 50. At this time, the drive unit 52 drives the pressing member 51A in the first direction so that the distance between the pressing member 51A and the pressing member 51B is shortened, so that the elastic member 8 is moved along the first direction. Compress. The compressive load at this time is, for example, about 10 kN. Thereby, the thickness of the elastic member 8 becomes D2. The elastic member 8 is held for a predetermined time in a state compressed to the thickness D2. Specifically, the thickness D2 can be, for example, about 60% to 95%, more preferably about 70% to 90% of the thickness D1. Moreover, the time for which the elastic member 8 is held in a compressed state can be, for example, about 24 hours.

  Thereby, the elastic member 8 is compressed so that a plastic deformation component and an elastic deformation component are generated in the elastic member 8. Here, “the plastic deformation component is generated” in the elastic member 8 means that at least a part of the elastic member 8 is plastically deformed. Further, “an elastic deformation component is generated” in the elastic member 8 means that at least a part of the elastic member 8 is elastically deformed. That is, here, a part of the elastic member 8 is plastically deformed and the remaining part is elastically deformed.

  When the elastic member 8 is compressed in the first direction, the elastic member 8 is also deformed in the shear direction. As described above, the pressure member 51B is supported in a movable state in the plane direction intersecting the first direction. For this reason, when deformation in the shearing direction occurs with respect to the elastic member 8, the pressing member 51B moves following the deformation. Thereby, the deformation | transformation of the shearing direction of the elastic member 8 is not inhibited, and the elastic member 8 can be effectively plastically deformed. Thereafter, the elastic member 8 is taken out from the pressure device 50.

  As shown in FIG. 5B, in the elastic member 8 after the compression process taken out from the pressurizing device 50, a state in which a part of deformation in the shear direction and the first direction is maintained (plastic deformation component). Is left). In an example, here, the plastic deformation component of the elastic member 8 is maintained at about 4%. That is, here, about 4% of the thickness of the elastic member 8 is in a plastically deformed state. In addition, the elastic deformation component generated in the elastic member 8 is released, and the deformation of the elastic member 8 is restored to that amount. Thereby, the thickness of the elastic member 8 in the state taken out from the pressure device 50 after the compression step is smaller than the thickness D1 of the elastic member 8 in the natural state, and the elastic member in a state compressed by the pressure device 50. It becomes D3 larger than thickness D2 of 8.

  Next, the stacking process will be described with reference to FIG. In the stacking step, first, the array unit is configured by arranging the battery units 5 (battery cells 9) along a predetermined direction. Thereafter, the plurality of battery units 5 are arranged by disposing the elastic member 8 at the end of the array so that the direction (first direction) intersecting the main surface 8S of the elastic member 8 coincides with the array direction of the array. (Battery cell 9) and elastic member 8 are laminated together. That is, in the stacking step, the stacked body 6 is configured by stacking the plurality of battery cells 9 and the elastic member 8 along the first direction.

  Subsequently, as shown in FIG. 2, in the integration step, the stack 6 is integrated by restraining the stacked body 6 along the first direction using a pair of end plates 7. One end plate 7 abuts on the elastic member 8, and the other end plate 7 is disposed so as to abut on the battery unit 5 disposed at one end of the laminate 6 on the opposite side of the elastic member 8. The end plate 7 applies a restraining load to the stacked body 6. Thereby, the elastic member 8 is compressed along the first direction. At this time, the thickness D4 of the elastic member 8 is larger than the thickness D2.

  That is, the compression amount for compressing the elastic member 8 by restraint in this integration step is smaller than the compression amount for compressing the elastic member 8 in the compression step. In other words, the compression amount for compressing the elastic member 8 in the compression step is larger than the compression amount for compressing the elastic member 8 by restraint in the integration step. In this way, the compression load in the compression process and the constraint load in the integration process are set. Here, the “compression amount” is a deformation amount of the elastic member in the first direction based on the dimension of the elastic member in the natural state in the first direction.

  As described above, in the method for manufacturing the battery module 1 according to this embodiment, first, the elastic member 8 is compressed along the first direction so that a plastic deformation component is generated in the elastic member 8. By this step, the elastic member 8 is in a state in which the elastic member 8 is deformed in the first direction and the shearing direction intersecting the first direction. Therefore, in a subsequent process, when the laminated body including the elastic member 8 is configured and integrated by restraint, the elastic member 8 is suppressed from being deformed in the shearing direction again. Therefore, the position shift of another laminated member (here, the end plate 7) in contact with the elastic member 8 is suppressed. Further, the positional accuracy of the heat transfer surface 23a is improved by suppressing the displacement of the member to be laminated (end plate 7). Thereby, the heat-transfer surface 23a and the heat conductive member 4 can be made to contact reliably, and the heat dissipation of the battery module 1 can be improved.

  Moreover, in the manufacturing method of the battery module 1 according to the present embodiment, in the compression step, the elastic member 8 is compressed by sandwiching the elastic member 8 along the first direction by the pair of pressure members 51A and 51B. In a state where the elastic member 8 is sandwiched between the pressure members 51A and 51B, the pressure member 51B is supported so as to be movable in a plane direction intersecting the first direction. Thereby, when the elastic member 8 is compressed, the pressure member 51B can follow the deformation of the elastic member 8 in the plane direction (the shear direction of the elastic member 8) intersecting the first direction. For this reason, the elastic member 8 can be plastically deformed more effectively in the shearing direction.

  In the method for manufacturing the battery module 1 according to the present embodiment, the elastic member 8 is compressed so that an elastic deformation component and a plastic deformation component are generated in the elastic member 8 in the compression step, and the elastic member 8 is compressed in the compression step. The amount of compression to be performed is larger than the amount of compression to compress the elastic member 8 by restraint in the integration step. Thereby, since the elastic member 8 is compressed more largely in the previous stage (compression process) of the integration process, the elastic member 8 effectively deforms the elastic member 8 in the shearing direction during the integration process. Can be suppressed.

  Moreover, in the manufacturing method of the battery module 1 according to the present embodiment, the elastic member 8 includes foamed rubber. Foam rubber is, for example, an air bubble formed by kneading an organic foaming agent, cross-linking agent, softening agent, reinforcing agent, etc. into raw rubber, vulcanizing in a sealed mold, and decomposing the foaming agent. A rubber sponge having The density of bubbles in the foamed rubber tends to be uneven. Therefore, when the elastic member 8 contains foamed rubber, there are places where the elastic member 8 is easily crushed and places where it is difficult to crush. Thus, even when the elastic member 8 includes a material such as foamed rubber in which the density of the bubbles is not uniform, deformation of the elastic member 8 in the shearing direction in the integration process can be suppressed.

  The above embodiment explains one Embodiment of the manufacturing method of the battery module which concerns on this invention. Therefore, the battery module manufacturing method according to the present invention is not limited to the above-described embodiment, and various modifications can be employed. For example, in the compression process, the distance between the pressure member 51A and the pressure member 51B may be controlled so that the thickness of the elastic member 8 becomes D2, or the compression load applied to the elastic member 8 is controlled. May be.

  In the embodiment described above, only the pressure member 51B of the pressure device 50 is supported so as to be movable in the direction along the main surfaces 51a and 51b. However, only the pressure member 51A is supported on the main surfaces 51a and 51b. It may be supported so as to be movable in the direction along. Alternatively, both of the pressure members 51A and 51B may be supported so as to be movable in the direction. In other words, in a state where the elastic member 8 is sandwiched between the pair of pressure members 51A and 51B, it is only necessary that at least one pressure member is supported so as to be movable in a plane direction intersecting the first direction.

  Further, in the compression step, the plurality of elastic members 8 may be compressed together using a pressurizing device 50A shown in FIG. The pressing device 50A includes a jig 60 sandwiched between the main surface 51a of the pressing member 51A and the main surface 51b of the pressing member 51B. The jig 60 includes a plurality of pressure members 61 arranged along a direction intersecting the main surfaces 51 a and 51 b, and a connecting member 62 that connects the plurality of pressure members 61. The connecting member 62 has a long bar shape, and is inserted into the insertion holes 61 h at both ends of the pressure member 61.

  Each of the elastic members 8 is disposed between the pressure members 61 such that the main surface 8S intersects the arrangement direction of the pressure members 61. Therefore, like the pressurizing device 50, the driving unit 52 drives the pressurizing member 51A in the first direction so that the distance between the pressurizing member 51A and the pressurizing member 51B is shortened, so that the pressurizing member The distance between 61 is also reduced, and the plurality of elastic members 8 are collectively compressed along the first direction. Here, play is provided between the inner surface of the insertion hole 61 h of the pressure member 61 and the connecting member 62.

  That is, the dimension of the insertion hole 61h in the direction intersecting the arrangement direction of the pressing members 61 is larger than the dimension of the connecting member 62 in the direction. For this reason, each pressing member 61 is movable in a planar direction intersecting the first direction in a state where the elastic member 8 is sandwiched. Accordingly, when the plurality of elastic members 8 are compressed together, deformation of the elastic members 8 in the shearing direction is not inhibited, and the elastic members 8 can be effectively plastically deformed.

  About the above embodiment, it adds to the following.

(Appendix)
A pressurizing device for compressing the elastic member,
A pair of pressure members having main surfaces facing each other;
A driving unit for driving one of the pressure members along a direction intersecting the main surface;
A support part for supporting the other pressing member in a state movable in the direction along the main surface;
A pressurizing device.

  DESCRIPTION OF SYMBOLS 1 ... Battery module, 6 ... Laminated body, 7 ... End plate (restraint member), 8 ... Elastic member, 8S ... Main surface, 9 ... Battery cell, 50 ... Pressurization apparatus, 51A, 51B ... Pressurization member.

Claims (4)

A battery module manufacturing method comprising: a stacked body including a plurality of battery cells and elastic members stacked on each other; and a restraining member that restrains the stacked body,
A compression step of compressing the elastic member such that a plastic deformation component is generated in the elastic member;
After the compression step, a stacking step of configuring the stacked body by stacking the plurality of battery cells and the elastic member along the first direction;
An integration step of consolidating the laminate by restraining the laminate along the first direction using the restraining member after the lamination step;
The elastic member has a main surface,
The first direction is a direction intersecting the main surface.
Manufacturing method of battery module. In the compression step, the elastic member is compressed by sandwiching the elastic member along the first direction by a pair of pressure members,
In a state where the elastic member is sandwiched between the pair of pressure members, at least one of the pressure members is supported in a state movable in a plane direction intersecting the first direction.
The manufacturing method of the battery module of Claim 1. In the compression step, the elastic member is compressed so that an elastic deformation component and a plastic deformation component are generated in the elastic member,
The compression amount for compressing the elastic member in the compression step is larger than the compression amount for compressing the elastic member by restraint in the integration step.
The manufacturing method of the battery module of Claim 1 or 2. The elastic member includes foamed rubber,
The manufacturing method of the battery module as described in any one of Claims 1-3.

Images