JP5880357B2 - Power storage device and method for manufacturing power storage device - Google Patents

Description

  The present invention relates to a power storage device having a structure for holding a plurality of power storage elements.

  Patent Document 1 describes a holder for holding a so-called cylindrical battery. The holder has a pair of first holding plates and a second holding plate disposed between the pair of first holding plates. And the battery is hold | maintained by pressing down a battery from the mutually opposing direction using a 1st holding plate and a 2nd holding plate.

JP 2011-129428 A

  The present invention provides a structure for holding a power storage element in a structure different from the holding structure described in Patent Document 1.

  The power storage device according to the first invention of the present application includes a plurality of power storage elements each extending in a predetermined direction, and holders for holding the plurality of power storage elements in a state where the plurality of power storage elements are arranged in a plane orthogonal to the predetermined direction. And having. Here, the holder is disposed in a plane orthogonal to the predetermined direction, has a pair of first plates having an opening through which each power storage element passes, and has an opening through which each power storage element passes, and a pair of first plates A second plate that is elastically deformed by being sandwiched between the plates. Further, the thickness of the second plate in the predetermined direction increases as it goes toward the opening of the second plate.

  According to the first invention of the present application, the opening of the second plate can be brought into contact with the outer surface of the power storage element by elastically deforming the second plate. Further, by increasing the thickness of the second plate toward the opening of the second plate, the contact area between the opening of the second plate and the storage element can be increased, and the storage element can be easily held. be able to.

  A power storage device according to a second invention of the present application includes a plurality of power storage elements each extending in a predetermined direction, and a holder for holding the plurality of power storage elements in a state where the plurality of power storage elements are arranged in a plane orthogonal to the predetermined direction. And having. Here, the holder is disposed in a plane orthogonal to the predetermined direction, has a pair of first plates having an opening through which each power storage element passes, and has an opening through which each power storage element passes, and a pair of first plates And a second plate that is deformed by being sandwiched between the plates. Moreover, the opening part of the 1st plate is produced | generated by the press work of the 1st plate, and contains the nail | claw part which protrudes in the 2nd plate side.

  According to the second invention of the present application, similarly to the first invention of the present application, the opening of the second plate can be brought into contact with the outer surface of the electricity storage element by elastically deforming the second plate. Here, by using the nail | claw part formed in the opening part of the 1st plate, the opening part of the 2nd plate can be made easy to deform | transform and it can make it easy to hold | maintain an electrical storage element. Moreover, since the nail | claw part protrudes in the 2nd plate side, when inserting an electrical storage element in the opening part of a 1st plate, the front-end | tip of a nail | claw part can make it difficult to contact the outer surface of an electrical storage element. .

It is an external view of a battery module. It is a side view of a battery module. It is an exploded view of a battery module. In Example 1, it is sectional drawing of the part holding a cell by a holder. In Example 1, it is an enlarged view which shows a part of rigid plate. In Example 1, it is an enlarged view which shows a part of elastic plate. In Example 2, it is sectional drawing of the part holding a cell by a holder. In Example 3, it is a figure explaining the positional relationship of the some opening part formed in the elastic plate. In Example 3, it is an enlarged view of the opening part of an elastic plate. In Example 4, it is an enlarged view of the area | region containing the opening part of an elastic plate. In Example 4, it is sectional drawing of the part holding a cell by a holder.

  Examples of the present invention will be described below.

  FIG. 1 is an external view of a battery module (corresponding to a power storage device) that is Embodiment 1 of the present invention. In FIG. 1, an X axis, a Y axis, and a Z axis are axes orthogonal to each other. Here, in this embodiment, the axis corresponding to the vertical direction is the Z axis. The relationship among the X axis, the Y axis, and the Z axis is the same in other drawings.

  The battery module 1 includes a plurality of single cells (corresponding to power storage elements) 10. The unit cell 10 is a so-called cylindrical unit cell. That is, the unit cell 10 extends in the X direction, and the cross-sectional shape when the unit cell 10 is cut along the YZ plane is formed in a circular shape. In FIG. 1, two unit cells 10 are shown, but the number of unit cells 10 can be set as appropriate.

  As the unit cell 10, a secondary battery such as a nickel metal hydride battery or a lithium ion battery can be used. An electric double layer capacitor (capacitor) can be used instead of the secondary battery. The battery module 1 can be used as a power source for running the vehicle, for example. Specifically, the electric energy output from the battery module 1 can be converted into kinetic energy by a motor / generator, and the vehicle can be driven using this kinetic energy.

  As shown in FIG. 2, a positive electrode terminal 11 and a negative electrode terminal 12 are provided on both end faces of the unit cell 10 in the X direction. FIG. 2 is a side view of the battery module 1 shown in FIG. 1 when viewed from the Y direction. The unit cell 10 includes a battery case 13 and a power generation element 14 disposed inside the battery case 13. A part of the battery case 13 constitutes a positive electrode terminal 11 and a negative electrode terminal 12.

  In the present embodiment, the positive electrode terminal 11 is formed of a convex surface, and the negative electrode terminal 12 is formed of a flat surface, but is not limited thereto. Specifically, the positive electrode terminal 11 and the negative electrode terminal 12 can be configured as convex surfaces.

  The power generation element 14 includes a positive electrode plate, a negative electrode plate, and a separator disposed between the positive electrode plate and the negative electrode plate. The positive electrode plate includes a current collector plate and a positive electrode active material layer formed on the surface of the current collector plate. The positive electrode active material layer includes, for example, an active material corresponding to the positive electrode, a conductive agent, and a binder. The positive electrode plate of the power generation element 14 is electrically connected to the positive electrode terminal 11 of the unit cell 10.

  The negative electrode plate has a current collector plate and a negative electrode active material layer formed on the surface of the current collector plate. The negative electrode active material layer includes, for example, an active material corresponding to the negative electrode, a conductive agent, and a binder. The negative electrode plate of the power generation element 14 is electrically connected to the negative electrode terminal 12 of the unit cell 10. Here, the electrolytic solution is infiltrated into the separator, the positive electrode active material layer, and the negative electrode active material layer.

  The holder 20 holds a plurality of unit cells 10. If the holder 20 is the unit cell 10 extending in the X direction, the unit cell 10 can be held.

  In the present embodiment, the plurality of single cells 10 are arranged so that the positive electrode terminal 11 (or the negative electrode terminal 12) is located on the same side with respect to the holder 20. One bus bar is in contact with the plurality of positive terminals 11 in the plurality of single cells 10, and one bus bar is in contact with the plurality of negative terminals 12 in the plurality of single cells 10. Thereby, the several cell 10 is electrically connected in parallel.

  In the present embodiment, the plurality of single cells 10 are electrically connected in parallel, but the plurality of single cells 10 may be electrically connected in series. When two unit cells 10 are electrically connected in series, the positive electrode terminal 11 of one unit cell 10 and the negative electrode terminal 12 of the other unit cell 10 are arranged on the same side with respect to the holder 20. Is preferred.

  Thereby, it becomes easy to connect two unit cells 10 electrically in series using a bus bar. That is, it is only necessary to connect the bus bar to the positive terminal 11 and the negative terminal 12 located on the same side with respect to the holder 20. When a plurality of unit cells 10 are electrically connected in series, it is necessary to prepare a number of bus bars corresponding to the number of unit cells 10. If the plurality of bus bars are held by a holder made of an insulating material such as a resin, the plurality of bus bars can be easily handled.

  The holder 20 has a pair of rigid plates (corresponding to the first plate) 21 and 22 and an elastic plate (corresponding to the second plate) 23. The rigid plates 21 and 22 have a function of holding the unit cell 10 and a function of deforming the elastic plate 23. The rigid plates 21 and 22 are disposed in the YZ plane. The rigid plates 21 and 22 have higher rigidity than the elastic plate 23 and can be formed of a metal such as aluminum, for example.

  If the rigid plates 21 and 22 are made of metal, heat generated in the unit cell 10 can be easily released into the atmosphere. The unit cell 10 (power generation element 14) generates heat due to charging / discharging or the like, but by forming the rigid plates 21 and 22 from metal, the heat generated in the unit cell 10 is easily released to the rigid plates 21 and 22. And it becomes easy to discharge | release heat from the rigid plates 21 and 22 in air | atmosphere. Thereby, the temperature rise of the cell 10 can be suppressed.

  In order to improve the heat dissipation of the rigid plates 21 and 22, the rigid plates 21 and 22 can be provided with fins. The fins can be provided on different surfaces of the rigid plates 21 and 22 that face each other. By providing the rigid plates 21 and 22 with fins, the rigidity of the rigid plates 21 and 22 can be improved.

  The rigid plates 21 and 22 have openings 21 a and 22 a that allow the cell 10 to penetrate therethrough. The opening 21 a is provided in the number corresponding to the number of the unit cells 10 and is formed in a shape along the outer peripheral surface of the unit cell 10. In the present embodiment, since the outer peripheral surface of the unit cell 10 is formed in a circular shape, the opening 21a is also formed in a circular shape. The diameter of the opening 21 a is substantially equal to the diameter of the unit cell 10. Similarly, the opening 22a is provided in the number corresponding to the number of the unit cells 10, and is formed in a shape (circular shape) along the outer peripheral surface of the unit cell 10. The diameter of the opening 22a is substantially equal to the diameter of the unit cell 10.

  If the diameters of the openings 21a and 22a are smaller than the diameter of the unit cell 10, the unit cell 10 cannot be inserted into the openings 21a and 22a. In addition, if the diameters of the openings 21a and 22a are too large with respect to the diameter of the unit cell 10, it becomes difficult to hold the unit cell 10 using the openings 21a and 22a.

  The diameters of the openings 21a and 22a can be set in consideration of the point where the unit cell 10 is inserted and the point where the unit cell 10 is held. Here, since the diameter of the unit cell 10 may vary due to manufacturing errors of the unit cell 10, the diameters of the openings 21 a and 22 a may be set in consideration of the variation in the diameter of the unit cell 10. it can.

  In the present embodiment, the diameters of the openings 21a and 22a are equal to each other, but the diameters of the openings 21a and 22a may be different. Specifically, of the openings 21a and 22a, the diameter of one opening is made equal to the diameter of the unit cell 10, and the diameter of the other opening is set to the diameter of the unit cell 10 or one of the openings. It can be made larger than the diameter.

  When the outer edges 21b and 22b of the rigid plates 21 and 22 are aligned in the YZ plane, the plurality of openings 21a and the plurality of openings 22a overlap each other in the X direction. For this reason, the unit cell 10 can be inserted into the openings 21a and 22a that overlap each other in the X direction.

  In this embodiment, the rigid plates 21 and 22 have the same structure and are formed of the same material, but at least one of the structure and the material may be different.

  For example, the rigid plates 21 and 22 can have different thicknesses (lengths in the X direction) or can have different outer shapes. For example, fins may be provided on the rigid plate 21 and fins may not be provided on the rigid plate 22. For example, different metal materials can be used for different materials.

  The elastic plate 23 is made of an elastically deformable material. As a material of the elastic plate 23, for example, rubber can be used. The elastic plate 23 has an opening 23 a that allows the single cell 10 to pass therethrough, and the opening 23 a is provided as many as the number of the single cells 10.

  Here, the elastic plate 23 is disposed between the rigid plates 21 and 22, and when the elastic plate 23 is sandwiched between the elastic plates 21 and 22, the opening 23 a of the elastic plate 23 has the rigid plates 21 and 22 in the X direction. 22 overlaps the openings 21a and 22a. Thereby, the unit cell 10 can be inserted into the opening 23 a of the elastic plate 23 and the openings 21 a and 22 a of the rigid plates 21 and 22.

  The opening 23 a is formed in a shape (circular shape) along the outer periphery of the unit cell 10, and the diameter of the opening 23 a is substantially equal to the diameter of the unit cell 10. Here, as will be described later, by elastically deforming the elastic plate 23, the diameter of the opening 23 a can be made smaller than the diameter of the unit cell 10.

  The outer edge 23 b of the elastic plate 23 is formed along the outer edges 21 b and 22 b of the rigid plates 21 and 22. That is, when viewed from the X direction, the outer edge 23 b of the elastic plate 23 overlaps with the outer edges 21 b and 22 b of the rigid plates 21 and 22.

  As shown in FIG. 3, the elastic plate 23 is elastically deformed by being compressed in the X direction by the pair of rigid plates 21 and 22. Here, the surfaces of the rigid plates 21 and 22 that come into contact with the elastic plate 23 are flat surfaces. Further, the surface of the elastic plate 23 that contacts the rigid plates 21 and 22 is also a flat surface.

  When the pair of rigid plates 21 and 22 sandwich the elastic plate 23, the elastic plate 23 is deformed, and the thickness (length in the X direction) of the elastic plate 23 is reduced. Further, as the thickness of the elastic plate 23 is reduced, the opening 23a of the elastic plate 23 is easily deformed toward the inside of the opening 23a. Thereby, the opening 23a of the elastic plate 23 can be brought into close contact with the outer peripheral surface of the unit cell 10, and the unit cell 10 can be easily held.

  FIG. 4 shows an enlarged view (cross-sectional view) of a portion where the unit cell 10 is held by the holder 20. As shown in FIG. 5, the rigid plate 21 has an inclined surface 21 c facing the rigid plate 22 side. Here, FIG. 5 shows only the rigid plates 21 and 22 in the configuration shown in FIG. The inclined surface 21 c is formed along the circumferential direction of the opening 21 a, in other words, is formed along the outer peripheral surface of the unit cell 10.

  Here, one end of the inclined surface 21 c is connected to the opening 21 a of the rigid plate 21, and the other end of the inclined surface 21 c is connected to the side surface 21 d of the rigid plate 21. The side surface 21d is a surface that comes into contact with the elastic plate 23 and is a flat surface. Here, the angle (acute angle) of the inclined surface 21c with respect to the side surface 21d is θ1.

  The rigid plate 22 has the same structure as the rigid plate 21. That is, as shown in FIG. 5, the rigid plate 22 has an inclined surface 22c facing the rigid plate 21, and the inclined surface 22c is formed along the circumferential direction of the opening 22a.

  Here, one end of the inclined surface 22 c is connected to the opening 22 a of the rigid plate 22, and the other end of the inclined surface 22 c is connected to the side surface 22 d of the rigid plate 22. The side surface 22d is a surface that comes into contact with the elastic plate 23 and is a flat surface. Here, the angle (acute angle) of the inclined surface 22c with respect to the side surface 22d is θ1. The angle θ1 is larger than 0 degree and smaller than 90 degrees.

  In the present embodiment, the angles of the inclined surfaces 21c and 22c are the same angle θ1, but the present invention is not limited to this. That is, the angle of the inclined surface 21c and the angle of the inclined surface 22c can be made different from each other.

  As shown in FIG. 6, the elastic plate 23 has a pair of inclined surfaces 23c, and the thickness (length in the X direction) of the elastic plate 23 increases as it approaches the opening 23a. Here, FIG. 6 shows only the elastic plate 23 in the configuration shown in FIG. Each inclined surface 23c is formed along the outer periphery of the opening 23a, and the distance from the opening 23a to each inclined surface 23c is constant. Of the pair of inclined surfaces 23 c, one inclined surface 23 c is in contact with the inclined surface 21 c of the rigid plate 21, and the other inclined surface 23 c is in contact with the inclined surface 22 c of the rigid plate 22.

  The elastic plate 23 has a pair of side surfaces 23d, and each side surface 23d is a flat surface. Of the pair of side surfaces 23 d, one side surface 23 d is in contact with the side surface 21 d of the rigid plate 21, and the other side surface 23 d is in contact with the side surface 22 d of the rigid plate 22. The distance between the pair of side surfaces 23d in the X direction, that is, the thickness of the elastic plate 23 on the side surface 23d is shorter than the length of the opening 23a in the X direction.

  As shown in FIG. 6, the angle of the inclined surface 23c with respect to the side surface 23d is θ2. The angle θ2 is larger than 0 degree and smaller than 90 degrees. The elastic plate 23 has a pair of inclined surfaces 23c, and the angles of these inclined surfaces 23d are the same angle θ2. In the present embodiment, the angles of the pair of inclined surfaces 23c are equal, but may be different from each other.

  In this embodiment, the angle θ1 is larger than the angle θ2. Accordingly, when the elastic plate 23 is compressed by bringing the pair of rigid plates 21 and 22 close to each other, the inclined surface 21c of the rigid plate 21 pushes the inclined surface 23c of the elastic plate 23 corresponding to the inclined surface 21c. . Further, the inclined surface 22c of the rigid plate 22 pushes the inclined surface 23c of the elastic plate 23 corresponding to the inclined surface 22c.

  The inclined surfaces 21c and 22c of the rigid plates 21 and 22 push the inclined surface 23c of the elastic plate 23, whereby the opening 23a of the elastic plate 23 can be displaced toward the outer peripheral surface of the unit cell 10, and the opening 23a. Can be brought into close contact with the outer peripheral surface of the unit cell 10. Moreover, the opening 23a can be expanded in the X direction by bringing the opening 23a into close contact with the outer peripheral surface of the unit cell 10. Thereby, the contact area of the opening part 23a and the cell 10 can be expanded, and the cell 10 can be easily held.

  In the present embodiment, since the inclined surface 23c is formed along the circumferential direction of the opening 23a, the entire opening 23a can be displaced toward the outer peripheral surface of the unit cell 10. That is, it is possible to suppress variation in the deformation amount of the opening 23a according to the position of the opening 23a in the circumferential direction. In other words, it can suppress that the force which pushes the outer peripheral surface of the cell 10 by the opening part 23a varies in the circumferential direction of the cell 10.

  Thereby, it becomes easy to position the unit cell 10 at the center of the opening 23a, in other words, at the center of the openings 21a and 22a. That is, it is possible to suppress the unit cell 10 from being offset inside the openings 21a and 22a. Further, if the unit cell 10 can be arranged without being offset from the openings 21a and 22a, the positioning accuracy of the unit cell 10 can be improved, and the bus bar can be easily attached to the unit cell 10.

  If the unit cell 10 is displaced inside the openings 21a and 22a, the bus bar must be enlarged in order to connect the bus bar to the unit cell 10 while absorbing such tolerances. In the present embodiment, since the positioning accuracy of the unit cell 10 can be improved, it is not necessary to increase the size of the bus bar, and the battery module 1 can be prevented from increasing in size with the increase in size of the bus bar.

  In the present embodiment, as described above, the length of the opening 23a in the X direction is made larger than the distance between the pair of side surfaces 23d. Thereby, it becomes easy to ensure the contact area of the elastic plate 23 (opening 23a) and the cell 10, and it becomes easy to hold | maintain the cell 10 along a X direction. In other words, it is possible to suppress the unit cell 10 from being held in an inclined state with respect to the YZ plane.

  When the unit cell 10 is arranged to be offset inside the openings 21a and 22a, or when the unit cell 10 is inclined with respect to the YZ plane, the two unit cells 10 disposed adjacent to each other interfere with each other. There is a risk that. Here, in the YZ plane, if the interval between the two openings 21a arranged adjacent to each other or the interval between the two openings 22a arranged adjacent to each other is widened, the two arranged adjacent to each other It can suppress that the cell 10 interferes with each other.

  However, if the interval between the two openings 21a (22a) arranged adjacent to each other is widened, the rigid plates 21 and 22 are enlarged. According to the present embodiment, as described above, the unit cell 10 can be prevented from being offset inside the openings 21a and 22a, and the unit cell 10 can be prevented from being inclined with respect to the YZ plane. Thereby, the two unit cells 10 arranged adjacent to each other do not easily interfere with each other, and it is not necessary to widen the interval between the two openings 21a (22a) arranged adjacent to each other. Therefore, the increase in size of the rigid plates 21 and 22 can be suppressed, and the increase in size of the battery module 1 accompanying the increase in size of the rigid plates 21 and 22 can be suppressed.

  The pair of rigid plates 21 and 22 are fixed to each other with the elastic plate 23 being deformed. The rigid plates 21 and 22 only need to be fixed to each other, and the structure for fixing the rigid plates 21 and 22 can be appropriately selected. For example, the rigid plates 21 and 22 can be fixed or the rigid plates 21 and 22 can be welded using bolts and nuts.

  In the present embodiment, the outer edges 21 b and 22 b of the rigid plates 21 and 22 can be brought into contact with the inner wall surface of the module case that houses the battery module 1. When the pair of rigid plates 21, 22 compress the elastic plate 23, the outer edge 23 b of the elastic plate 23 may protrude from the outer edges 21 b, 22 b of the rigid plates 21, 22 due to elastic deformation of the elastic plate 23.

  Therefore, the outer edges 23b of the elastic plates 23 can be prevented from protruding from the outer edges 21b, 22b of the rigid plates 21, 22 by bringing the outer edges 21b, 22b of the rigid plates 21, 22 into contact with the inner wall surface of the module case. Even if the module case that covers the battery module 1 is not used, if the member (so-called frame member) that surrounds only the outer edges 21b and 22b of the rigid plates 21 and 22 is used, the outer edge 23b of the elastic plate 23 is Protruding from the outer edges 21b and 22b of 21 and 22 can be prevented.

  In the present embodiment, the openings 21a and 22a are formed in the rigid plates 21 and 22 by the number of the unit cells 10, but the present invention is not limited to this. A plurality of adjacent openings 21a (or openings 22a) in the YZ plane may be partially connected. Here, if the area | region which connects several opening part 21a (or opening part 22a) spreads, it may become difficult to hold | maintain the single cell 10 by the opening part 21a (or opening part 22a). In consideration of this point, a plurality of openings 21a (or openings 22a) can be connected.

  The holder 20 in this embodiment has a pair of rigid plates 21 and 22 and an elastic plate 23, but is not limited thereto. Specifically, three or more rigid plates can be used. In this case, the elastic plate may be sandwiched between two rigid plates adjacent in the X direction.

  In the present embodiment, the opening 23a of the elastic plate 23 is formed in a circular shape, but is not limited thereto. The opening 23 a may be in close contact with the outer peripheral surface of the unit cell 10. For example, the outer shape of the opening 23a can be a polygon. Even in this case, the single cell 10 can be accurately positioned with respect to the openings 21a and 22a by displacing the entire opening 23a toward the inside of the opening 23a.

  A battery module that is Embodiment 2 of the present invention will be described. In the present embodiment, members having the same functions as those described in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Hereinafter, differences from the first embodiment will be mainly described.

  FIG. 7 is an enlarged view (cross-sectional view) of a portion where the unit cell 10 is held by the holder 20. In this embodiment, the rigid plates 21 and 22 are formed by press working, and claw portions 21e and 22e are formed in the openings 21a and 22a of the rigid plates 21 and 22, respectively. Here, a part of claw part 21e, 22e forms opening part 21a, 22a.

  When performing press processing using a die and a punch, burrs may occur in the pressed product due to the clearance between the die and the punch. This burr corresponds to the claw portions 21e and 22e. In the present embodiment, the openings 23a of the elastic plate 23 are deformed by using the claw portions 21e and 22e generated by pressing the rigid plates 21 and 22.

  As shown in FIG. 7, the claw portion 21 e of the rigid plate 21 protrudes toward the elastic plate 23 and presses the elastic plate 23. The claw portion 22e of the rigid plate 22 protrudes toward the elastic plate 23 and presses the elastic plate 23.

  When the claw portions 21 e and 22 e push the elastic plate 23, the opening 23 a of the elastic plate 23 can be deformed toward the outer peripheral surface of the unit cell 10. Thereby, the opening part 23a is closely_contact | adhered to the outer peripheral surface of the cell 10, and the cell 10 can be hold | maintained. Here, since the claw portions 21e and 22e are formed along the circumferential direction of the opening 23a, the entire opening 23a can be brought into close contact with the outer peripheral surface of the unit cell 10.

  By bringing the whole of the opening 23 a into close contact with the outer peripheral surface of the unit cell 10, it is possible to prevent the unit cell 10 from being offset inside the openings 21 a and 22 a of the rigid plates 21 and 22. That is, the unit cell 10 can be easily positioned with respect to the centers of the openings 21a and 22a.

  As described in the first embodiment, the gap between the two adjacent openings 21a (or 22a) in the YZ plane is suppressed by suppressing the deviation of the unit cell 10 inside the openings 21a and 22a. It is not necessary to widen, and an increase in the size of the rigid plates 21 and 22 can be suppressed. If the increase in size of the rigid plates 21 and 22 is suppressed, the increase in size of the battery module 1 can also be suppressed.

  Here, if the claw portion 21e protrudes on the opposite side to the elastic plate 23 side, it becomes difficult to deform the elastic plate 23 using the claw portion 21e. Further, when the unit cell 10 is inserted into the opening 21a, the claw portion 21e is likely to come into contact with the outer peripheral surface of the unit cell 10, and the claw portion 21e may damage the outer peripheral surface of the unit cell 10. .

  For example, when an insulating film is provided on the outer peripheral surface of the unit cell 10, the film may be damaged by the claw portion 21e. In the present embodiment, since the claw portion 21e protrudes toward the elastic plate 23, the claw portion 21e does not damage the outer peripheral surface of the unit cell 10. Similarly, since the claw portion 22e protrudes toward the elastic plate 23, the claw portion 22e does not damage the outer peripheral surface of the unit cell 10.

  Further, by projecting the claw portions 21e and 22e toward the elastic plate 23, the unit cell 10 can be easily moved into the openings 21a and 22a using the curved surfaces of the claw portions 21e and 22e. That is, the claw portions 21e and 22e can be used as guide surfaces when the cell 10 is inserted from the opening 21a or the opening 22a.

  A battery module that is Embodiment 3 of the present invention will be described. In the present embodiment, members having the same functions as those described in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Hereinafter, differences from the first embodiment will be mainly described.

  FIG. 8 is a view (front view) of the elastic plate 23 as viewed from the X direction, and shows the positional relationship between a plurality of openings 23 a formed in the elastic plate 23. 8 shows the positional relationship of the openings 23a in the elastic plate 23, the positional relationship of the openings 21a and 22a in the rigid plates 21 and 22 is the same as that in FIG.

  Around the opening 23a arranged at the position P1, six openings 23a are provided at positions P2 to P7. The openings 23a arranged at the positions P1 and P2 are adjacent in the direction of the arrow D1, and the openings 23a arranged at the positions P1 and P3 are adjacent in the direction of the arrow D2. Moreover, the opening part 23a arrange | positioned at position P1, P4 is adjacent in the direction of arrow D3.

  The openings 23a arranged at the positions P1, P5 are adjacent in the direction of the arrow D4, and the openings 23a arranged at the positions P1, P6 are adjacent in the direction of the arrow D5. Here, the direction of the arrow D4 is the same as the direction of the arrow D1, and the direction of the arrow D5 is the same as the direction of the arrow D2.

  Moreover, the opening part 23a arrange | positioned at position P1, P7 is adjacent in the direction of arrow D6. Here, the direction of the arrow D6 is the same as the direction of the arrow D3.

  In the present embodiment, the shape of the opening 23a of the elastic plate 23 is determined in consideration of the positional relationship of the opening 23a shown in FIG. Specifically, the opening 23a is formed in the shape shown in FIG. FIG. 9 shows the shape of the opening 23a arranged at the position P1. As shown in FIG. 9, the opening 23a is formed with protruding portions 23a1 to 23a6 that protrude inside the opening 23a.

  The protrusion 23a1 is provided at a position corresponding to the direction of the arrow D1, and protrudes in the direction of the arrow D1. The protruding portion 23a2 is provided at a position corresponding to the direction of the arrow D2, and protrudes in the direction of the arrow D2. The protrusion 23a3 is provided at a position corresponding to the direction of the arrow D3, and protrudes in the direction of the arrow D3.

  The protrusion 23a4 is provided at a position corresponding to the direction of the arrow D4 and protrudes in the direction of the arrow D4. The protrusion 23a5 is provided at a position corresponding to the direction of the arrow D5 and protrudes in the direction of the arrow D5. The protrusion 23a6 is provided at a position corresponding to the direction of the arrow D6 and protrudes in the direction of the arrow D6.

  When the elastic plate 23 is compressed by the rigid plates 21 and 22, the amount of deformation of the elastic plate 23 changes according to the area of the elastic plate 23 occupying in the YZ plane. That is, as the area of the elastic plate 23 to be compressed increases, the deformation amount of the elastic plate 23 increases.

  For example, in FIG. 8, in the region located between the openings 23a at the positions P1 and P2, the elastic plate 23 is hardly deformed even if it is compressed. In particular, in the region where the distance between the openings 23a at the positions P1 and P2 is the shortest, deformation is most difficult.

  On the other hand, the opening 23a is not provided in a direction away from the opening 23a at the position P2 (for example, the Z direction shown in FIG. 8) with respect to the opening 23a at the position P1. For this reason, such a region becomes larger than a region located between the openings 23a at the positions P1 and P2, and is easily deformed when the elastic plate 23 is compressed. As described above, the elastic plate 23 includes a region that is not easily deformed and a region that is easily deformed according to the arrangement of the plurality of openings 23a.

  Therefore, in the present embodiment, the protrusions 23a1 to 23a6 are provided in the opening 23a in consideration of the region where the elastic plate 23 is difficult to deform. About the area | region which is hard to deform | transform, by providing protrusion part 23a1-23a6 previously, the elastic plate 23 can be made easy to deform | transform by the part of protrusion part 23a1-23a6.

  Here, since the opening 23a is formed in a circular shape, the distance between the two openings 23a arranged adjacent to each other includes various distances. That is, the distance between the two openings 23a is the smallest on the line connecting the centers of the two openings 23a, and the distance between the two openings 23a is the largest on the tangent line of the openings 23a.

  In the present embodiment, the shapes of the protrusions 23a1 to 23a6 are set in consideration of the distance between the two openings 23a described above. That is, at the position where the interval between the two openings 23a is the narrowest, the protruding amount of each protruding portion 23a1 to 23a6 is maximized. And the protrusion amount of each protrusion part 23a1-23a6 is made small, so that the space | interval of the two opening parts 23a becomes large.

  In FIG. 9, the shape of the opening 23a disposed at the position P1 is shown. However, the opening 23a disposed at each of the positions P2 to P6 can be provided with a protrusion in consideration of the above-described points. . That is, the shape of each opening 23 a can be determined in consideration of the positional relationship with the openings 23 a arranged around the opening 23.

  As a result, the entire opening 23 a can be easily brought into contact with the outer peripheral surface of the unit cell 10, and the unit cell 10 can be easily positioned with respect to the centers of the openings 21 a and 22 a in the rigid plates 21 and 22. Thus, by positioning the single cell 10 with high accuracy, as described in the first embodiment, it is possible to prevent the rigid plates 21 and 22 from being enlarged and the battery module 1 from being enlarged.

  A battery module that is Embodiment 4 of the present invention will be described. In the present embodiment, members having the same functions as those described in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Hereinafter, differences from the first embodiment will be mainly described.

  FIG. 10 is a view (front view) when a part of the elastic plate 23 is viewed from the X direction. As shown in FIG. 10, the elastic plate 23 is formed with a plurality of openings 23e as well as the openings 23a. The plurality of openings 23e are provided along the circumferential direction of the openings 23a, and the shortest distances between the openings 23e and the openings 23a are equal to each other.

  Here, the plurality of openings 23e only have to be arranged along the circumferential direction of the opening 23a, and the number of openings 23e can be set as appropriate. Moreover, although the diameter of the opening part 23e can also be set suitably, when ensuring the deformation amount of the elastic plate 23, it is preferable to make the diameter of the opening part 23e smaller than the diameter of the opening part 23a.

  As described in the third embodiment, as the diameter of the opening 23e increases, it may be difficult to deform the region located between the opening 23a and the opening 23e. Therefore, in order to easily deform the region located around the opening 23a, the diameter of the opening 23e is preferably smaller than the diameter of the opening 23a.

  FIG. 10 shows the positional relationship of the opening 23e with respect to one opening 23a. However, when a plurality of openings 23a are formed on the elastic plate 23, FIG. 10 shows each opening 23a. Thus, the opening 23e can be arranged. Here, about the two opening parts 23a arrange | positioned adjacently, the opening part 23e can be shared. For example, only one opening 23e may be provided between two openings 23a arranged adjacent to each other.

  11 is a Z1-Z1 cross-sectional view shown in FIG. In FIG. 11, not only the elastic plate 23 but also the rigid plates 21 and 22 and the unit cell 10 are shown.

  As shown in FIG. 11, the opening 23e has a tapered surface, and the diameter of the opening 23e continuously decreases from the rigid plate 21 side toward the rigid plate 22 side. The rigid plate 21 is provided with a pin 21f, and the pin 21f protrudes toward the rigid plate 22 side.

  The pins 21f are provided as many as the number of openings 23e, and are provided at positions corresponding to the openings 23e. Here, the plurality of pins 21f are arranged along the circumferential direction of the opening 21a. Thereby, as shown in FIG. 11, the pin 21 f is inserted into the opening 23 e of the elastic plate 23. The outer peripheral surface of the pin 21f is a tapered surface and is formed in a shape along the opening 23e.

  The elastic plate 23 can be deformed by compressing the elastic plate 23 by the rigid plates 21 and 22 while inserting the pin 21f into the opening 23e. Here, by inserting the pin 21 f into the opening 23 e, the opening 23 a can be deformed toward the inside of the opening 23 a, in other words, toward the outer peripheral surface of the unit cell 10.

  Here, the angle of the tapered surface of the pin 21f can be made larger than the angle of the tapered surface of the opening 23e. Here, the angle of the tapered surface is an angle with respect to a plane (YZ plane) where the rigid plate 21 and the elastic plate 23 come into contact. By setting the angle of the tapered surface in this way, the opening 23e can be easily pressed by the pin 21f, and the opening 23a can be easily deformed.

  Since the plurality of openings 23e are arranged along the outer periphery of the opening 23a, the entire opening 23a can be deformed. Here, since the plurality of openings 23e are provided at positions where the distances from the opening 23a are equal to each other in the radial direction of the opening 23a, the entire opening 23a is brought into contact with the outer peripheral surface of the unit cell 10. be able to.

  Thereby, it becomes easy to position the unit cell 10 with respect to the center of the opening part 23a, and it can suppress that the unit cell 10 deviates inside the opening parts 21a and 22a of the rigid plates 21 and 22. As described in the first embodiment, it is not necessary to widen the interval between the two openings 21a (22a) arranged adjacent to each other in the YZ plane, and the size of the rigid plates 21 and 22 can be increased. The enlargement of the battery module 1 can be suppressed.

  Moreover, the rigid plate 21 can be easily positioned with respect to the elastic plate 23 by inserting the pin 21f into the opening 23e. By positioning the elastic plate 23 and the rigid plate 21 using the pin 21f and the opening 23e, the opening 23a of the elastic plate 23 and the opening 21a of the rigid plate 21 are easily overlapped in the X direction. Can do. Thereby, the cell 10 can be easily inserted in the openings 21a and 23a.

  The structure demonstrated in each of Examples 1-4 can also be used independently, and the structure demonstrated in Examples 1-4 can also be combined arbitrarily.

1: battery module (power storage device), 10: single battery (power storage element), 11: positive electrode terminal,
12: negative terminal, 13: battery case, 14: power generation element, 20: holder,
21, 22: Rigid plate (first plate), 21a, 22a: opening,
21b, 22b: outer edge, 21c, 22c: inclined surface, 21d, 22d: side surface,
21e, 22e: claw part, 21f: pin, 23: elastic plate (second plate),
23a: opening, 23b: outer edge, 23c: inclined surface, 23d: side surface, 23e: opening

Claims (2)

A plurality of power storage elements each extending in a predetermined direction;
A holder for holding each of the plurality of power storage elements in a state where the plurality of power storage elements are arranged in a plane orthogonal to the predetermined direction;
The holder is
A pair of first plates disposed in a plane orthogonal to the predetermined direction and having an opening through which each of the power storage elements penetrates;
A second plate that has an opening for penetrating each power storage element and elastically deforms by being sandwiched between the pair of first plates;
The thickness of the said 2nd plate in the said predetermined direction increases as it goes to the said opening part of the said 2nd plate, The electrical storage apparatus characterized by the above-mentioned. A plurality of power storage elements each extending in a predetermined direction;
Wherein the plurality of states the electric storage device is arranged in a plane perpendicular to the predetermined direction, a manufacturing method of a power storage device that have a, a holder for holding the plurality of power storage devices, respectively,
The holder is
A pair of first plates disposed in a plane orthogonal to the predetermined direction and having an opening through which each of the power storage elements penetrates;
A second plate that has an opening that penetrates each power storage element, and that is deformed by being sandwiched between the pair of first plates;
By pressing the previous SL first plate, the manufacturing method of the power storage device to generate the claw portion to the opening of the first plate, characterized in that makes projecting the pawl portion on the side of the second plate.

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