Patent Publication Number: US-2021167453-A1

Title: Cell module

Description:
TECHNICAL FIELD 
     The present invention relates to a cell module in which cylindrical batteries are arranged at fixed positions by a holder, and particularly to a cell module composed by disposing a holder so as to inhibit positional shifts of cylindrical batteries and prevent/suppress the cylindrical batteries from rotating. 
     BACKGROUND ART 
     A cell module has been developed in which a plurality of cylindrical batteries are placed in holding spaces of a holder and arranged in a parallel posture. In this cell module, it is important to inhibit the cylindrical batteries from rotating and to arrange the cylindrical batteries at fixed positions of the holder. This is because, when the cylindrical batteries rotate, a unreasonable load may act on a joint of each of the batteries to a metal-sheet bus bar that connects the batteries in series or in parallel to one another, and a harmful effect such as a breakage may occur. A cell module has been developed that inhibits the cylindrical batteries from rotating and arranges the cylindrical batteries in the holding spaces of the holder. (See PTL 1) 
     CITATION LIST 
     Patent Literature 
     PTL 1: Unexamined Japanese Patent Publication No. 2010-9798 
     SUMMARY OF THE INVENTION 
     In the cell module in which the cylindrical batteries are arranged in the holder so as not to rotate, stopper portions that are brought into contact with surfaces of the batteries are provided in the holder, and the stopper portions are thrust against the cylindrical batteries inserted into the holder, and inhibit the cylindrical batteries from rotating. In this cell module, the cylindrical batteries cannot be smoothly inserted into the holding space of the holder. This is because the stopper portions are thrust against the surfaces of the cylindrical batteries inserted into the holder to increase frictional resistance between the cylindrical batteries and the stopper portions. In particular, the cell module has a drawback that, if the stopper portions are strongly thrust against the surfaces of the cylindrical batteries in order to surely inhibit the cylindrical batteries from rotating, then the frictional resistance will increase, and it becomes more and more impossible to smoothly insert the cylindrical batteries into the holder. 
     The present invention has been developed for the purpose of eliminating the above drawback. One of the objects of the present invention is to provide a cell module that, while achieving a structure in which the cylindrical batteries can be smoothly inserted into the holder, can surely inhibit positional shifts of the cylindrical batteries, and can prevent/suppress the cylindrical batteries from rotating. 
     A cell module of the present invention includes a plurality of cylindrical batteries  1  and holder  2 ,  20  composed by arranging respective cylindrical batteries  1  in a parallel posture. Holder  2 ,  20  includes: holder body  3 ,  23  having holding spaces  13 ,  33  for arranging cylindrical batteries  1  at fixed positions; and sub holder  4 ,  24  stacked on holder body  3 ,  23 . Holder body  3 ,  23  has stopper portions  5 ,  25  deformed toward surfaces of cylindrical batteries  1  arranged in holding spaces  13 ,  33 . Sub holder  4 ,  24  has push rods  6 ,  26  that push out stopper portions  5 ,  25  to cylindrical batteries  1  in a state of being coupled to holder body  3 ,  23 . In a state in which sub holder  4 ,  24  is coupled to holder body  3 ,  23 , in the cell module, push rods  6 ,  26  thrust stopper portions  5 ,  25  against cylindrical batteries  1 , and press the surfaces of cylindrical batteries  1  arranged in holding spaces  13 ,  33 . 
     The cell module of the present invention can have a structure in which, in the state in which sub holder  4 ,  24  is coupled to holder body  3 ,  23 , push rods  6 ,  26  are inserted into back surfaces of stopper portions  5 ,  25 , press stopper portions  5 ,  25  from the back surfaces, and thrust and press front surfaces of stopper portions  5 ,  25  against cylindrical batteries  1 . 
     In the cell module of the present invention, the front surfaces of stopper portions  5 ,  25  can be curved surfaces  5   a ,  25   a  that go along the surfaces of cylindrical batteries  1 . 
     In the cell module of the present invention, push rods  6 ,  26  of sub holders  4 ,  24  can have protrusions  6   a ,  26   a  that locally push out the back surfaces of stopper portions  5 ,  25 . 
     In the cell module of the present invention, each of pressed surfaces in which the back surfaces of stopper portions  5  are pressed by protrusions  6   a  provided on push rods  6  can be formed into a flat shape. 
     In the cell module of the present invention, stopper portions  5  can be formed as elastic arms  5 A deformed and pressed against cylindrical batteries  1 , and holder body  3  can be made of plastic composed by integrally molding elastic arms  5 A. 
     In the cell module of the present invention, holder body  3  can be provided with insertion spaces  14  in each of which an entire shape is a substantially triangular prism shape, each of insertion spaces  14  being provided in a region surrounded by three cylindrical batteries  1  arranged in adjacent columns where the plurality of cylindrical batteries  1  are arranged in a bale stack and between cylindrical batteries  1  arranged in the same column, cylindrical cell  1  in an adjacent column is arranged, and between each of insertion spaces  14  and each of cylindrical batteries  1 , two stopper portions  5  that push out surfaces of two cylindrical batteries  1  can be arranged as a pair of stopper portions  5  in an inverse V shape in plan view, and can be integrally coupled to holder body  3 . 
     In the cell module of the present invention, holder body  3  can be provided with separation slits  15  along both side edges of stopper portions  5 , each of separation slits  15  separating the pair of stopper portions  5  from holder body  3 . 
     In the cell module of the present invention, between each of insertion spaces  14  and cylindrical batteries  1 , two of stopper portions  5  that press the surfaces of two cylindrical batteries  1  and cover portion  7  that covers the surface of one cylindrical cell  1  can be provided integrally with holder body  3 , and cover portion  7  can have both side edges integrally coupled to holder body  3 . 
     In the cell module of the present invention, in three cylindrical batteries  1  arranged around insertion space  14 , two cylindrical batteries  1  pressed by stopper portions  5  can be connected in parallel to each other, and cylindrical batteries  1  pressed by stopper portions  5  and cylindrical cell  1  arranged inside cover portion  7  can be connected in series to each other. 
     Moreover, the cell module of the present invention can have a structure in which holder body  23  includes rubbery holder  22  formed by molding a rubbery elastic body, rubbery holder  22  has holding spaces  33  for arranging cylindrical batteries  1 , and insertion spaces  34  for push rods  26 , portions between insertion spaces  34  and surfaces of rubbery holder  22 , the surfaces facing cylindrical batteries  1 , are defined as elastically deformable stopper portions  25 , push rods  26  are inserted into insertion spaces  34 , and push rods  26  thrust and press elastically deformed stopper portions  25  against the surfaces of cylindrical batteries  1 . 
     Furthermore, in the cell module of the present invention, holder body  23  can have a stacked structure of rubbery holder  22  and plastic holder  21 . 
     Moreover, in the cell module of the present invention, an inner surface of each of holding spaces  33  can have a cylindrical shape that goes along the surface of each of cylindrical batteries  1 , an outer shape of each of push rods  26  can be made larger than an inner shape of each of insertion spaces  34 , push rods  26  can be inserted into insertion spaces  34 , and stopper portions  5  can be elastically deformed and thrust against the surfaces of cylindrical batteries  1 . 
     Furthermore, in the cell module of the present invention, push rods  26  can have protrusions  26   a  that protrude toward cylindrical batteries  1  arranged to face stopper portions  25 . 
     Advantageous Effects of Invention 
     Although the cylindrical batteries of the present invention can be smoothly inserted into the holder and assembled efficiently, the cell module has features that the positional shifts of the cylindrical batteries arranged at fixed positions by the holder can be surely inhibited, and that the cylindrical batteries can be prevented/suppressed from rotating. A reason for the above is as follows. In the above cell module, the holder is composed of the holder body and the sub holder, the holder body is provided with the stopper portions deformed toward the surfaces of the cylindrical batteries arranged in the holding spaces, the sub holder is provided with the push rods that push out the stopper portions to the cylindrical batteries in a state in which the sub holder is coupled to the holder body, the sub holder is coupled to the holder body, and the stopper portions are thrust against the cylindrical batteries by the push rods, and press the surfaces of the cylindrical batteries arranged in the holding spaces. In the power source module having this structure, after the cylindrical batteries are inserted into the holder, the sub holder is coupled to the holder body, and the stopper portions are strongly thrust against the surfaces of the cylindrical batteries by the push rods of the sub holder. Accordingly, it is not necessary to strongly thrust the stopper portions against the surfaces of the cylindrical batteries in a state of inserting the cylindrical batteries, and the cylindrical batteries can be smoothly inserted into the holder. In a state in which the cylindrical batteries are arranged at fixed positions of the holder, the stopper portions can be pressed against the surfaces of the cylindrical batteries by the push rods of the sub holder to increase the frictional resistance, so the positional shifts of the cylindrical batteries can be surely inhibited, and the cylindrical batteries can be prevented/suppressed from rotating. 
     Moreover, the cell module of the present invention also achieves a feature that the sub holder and the holder body can be coupled to each other at a fixed position in a state of causing no positional shift since the sub holder is coupled to the holder body via the push rods. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a perspective view of a cell module according to a first exemplary embodiment of the present invention. 
         FIG. 2  is an exploded perspective view of a holder of the cell module illustrated in  FIG. 1 . 
         FIG. 3  is an exploded perspective view of the holder illustrated in  FIG. 2  as viewed from below. 
         FIG. 4  is a vertical sectional view of the holder that accommodates cylindrical batteries, corresponding to a cross section taken along line IV-IV of  FIG. 2 . 
         FIG. 5  is a cross-sectional view taken along line V-V of the holder illustrated in  FIG. 4 . 
         FIG. 6  is an enlarged cross-sectional view of a main part of the holder illustrated in  FIG. 5 . 
         FIG. 7  is an enlarged perspective view of a holder body. 
         FIG. 8  is an enlarged bottom perspective view of a sub holder. 
         FIG. 9  is a perspective view of a cell module according to a second exemplary embodiment of the present invention. 
         FIG. 10  is an exploded perspective view of a holder of the cell module illustrated in  FIG. 9 . 
         FIG. 11  is a vertical sectional view of the holder that accommodates cylindrical batteries, corresponding to a cross section taken along line XI-XI of  FIG. 9 . 
         FIG. 12  is a cross-sectional view taken along line XII-XII of the holder illustrated in  FIG. 11 . 
         FIG. 13  is an exploded perspective view of a sub holder and a rubbery holder as viewed from below. 
         FIG. 14  is an enlarged perspective view of the rubbery holder. 
         FIG. 15  is an enlarged bottom perspective view of the sub holder. 
         FIG. 16  is an enlarged cross-sectional view of a main part of the holder illustrated in  FIG. 12 . 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, the present invention will be described in detail with reference to the drawings. In the following description, terms (for example, “top”, “bottom”, and other terms including those terms) indicating specific directions or positions are used as necessary; however, the use of those terms is for facilitating the understanding of the invention referring to the drawings, and the technical scope of the present invention is not limited by the meanings of the terms. Moreover, portions having the same reference numerals, which appear in a plurality of drawings, indicate the same or equivalent portions or members. 
     Furthermore, the exemplary embodiments described below illustrate specific examples of the technical idea of the present invention, and do not limit the present invention to the following. Further, dimensions, materials, shapes, relative arrangements and the like of components described below are not intended to limit the scope of the present invention only thereto unless specifically stated, and are intended to be merely exemplified. Moreover, contents described in one embodiment and one example are also applicable to other embodiments and examples. Furthermore, sizes, positional relationships and the like of members illustrated in the drawings may sometimes be exaggerated in order to clarify the explanation. 
     A cell module according to an exemplary embodiment of the present invention is illustrated in  FIGS. 1 to 5 . In these drawings,  FIG. 1  illustrates a perspective view of the cell module,  FIG. 2  illustrates an exploded perspective view of the cell module illustrated in  FIG. 1 ,  FIG. 3  illustrates an exploded perspective view of the cell module of  FIG. 2  as viewed from below,  FIG. 4  illustrates a vertical sectional view of the cell module of  FIG. 1 , and  FIG. 5  illustrates a horizontal sectional view of the cell module of  FIG. 1 . Cell module  100  illustrated in  FIGS. 1 to 5  includes: a plurality of cylindrical batteries  1 ; holder  2  in which cylindrical batteries  1  are arranged in a parallel posture; bus bars  11  that connect cylindrical batteries  1  in series and in parallel to one another; and circuit board  10  that mounts thereon a protection circuit of cylindrical batteries  1 . 
     Holder  2  includes: holder body  3  having holding spaces  13  for cylindrical batteries  1 ; and sub holders  4  stacked on holder body  3 . Holder body  3  is provided with stopper portions  5  deformed toward surfaces of cylindrical batteries  1  arranged in holding spaces  13 . Each sub holder  4  has push rods  6  that push out stopper portions  5  to cylindrical batteries  1  in a state of being coupled to holder body  3 . In a state where sub holder  4  is coupled to holder body  3 , push rods  6  thrust stopper portions  5  against cylindrical batteries  1 , press the surfaces of cylindrical batteries  1  in holding spaces  13 , inhibit positional shifts of cylindrical batteries  1 , and prevent/suppress cylindrical batteries  1  from rotating. 
       FIG. 6  is an enlarged cross-sectional view of a portion in which sub holder  4  is coupled to holder body  3  and push rod  6  thrusts stopper portions  5  against cylindrical batteries  1 . As illustrated in  FIGS. 4 to 6 , in cell module  100 , sub holder  4  is coupled to holder body  3 , and each push rod  6  is inserted into back surfaces of stopper portions  5 . Holder body  3  is provided with insertion spaces  14  for push rods  6 . Each push rod  6  guided into insertion space  14  pushes out stopper portions  5  from back surfaces of stopper portions  5 . Stopper portions  5  pressed from the back surfaces thrust front surfaces of stopper portions  5  against cylindrical batteries  1 . The front surfaces of stopper portions  5  are thrust against cylindrical batteries  1  to inhibit the positional shifts of cylindrical batteries  1  and to prevent/suppress cylindrical batteries  1  from rotating. This is because frictional resistance between stopper portion  5  and cylindrical cell  1  increases. Stopper portions  5  are pressed from the back surfaces by push rod  6  and are elastically deformed. The elastically deformed front surfaces of stopper portions  5  are thrust against the surfaces of cylindrical batteries  1 . The front surfaces of stopper portions  5  illustrated in  FIGS. 6 and 7  are formed as curved surfaces  5   a  that go along the surfaces of cylindrical batteries  1 .  FIG. 7  is an enlarged perspective view illustrating stopper portions  5  provided on holder body  3 . Stopper portions  5  bring the front surfaces into contact with the surfaces of cylindrical batteries  1  in a surface contact state, and closely adhere to the surfaces of cylindrical batteries  1  in a wide area, so that the positional shifts of cylindrical batteries  1  can be effectively inhibited, and the cylindrical batteries  1  can be prevented/suppressed from rotating. 
     The back surfaces of stopper portions  5 , which are pressed by push rod  6 , respectively have flat shapes as illustrated in  FIG. 7 . Stopper portions  5  having the flat back surfaces can reduce an imbalance of pressing force due to positional shifts of pressed portions pressed by push rod  6 . This is because, even if positions pressed by push rod  6  move along the back surfaces of stopper portions  5 , the back surfaces can be pressed by the same pressing force. 
       FIG. 8  is an enlarged perspective view of push rod  6  provided on sub holder  4 . Push rod  6  illustrated in  FIG. 8  is provided with protrusions  6   a  that locally push out the back surfaces of stopper portion  5 . Protrusions  6   a  are formed as ridges that extend in an insertion direction of push rod  6  such that push rod  6  can be smoothly inserted. A structure in which protrusions  6   a  of push rod  6  press the back surfaces of stopper portions  5  absorbs a dimensional error, thus making it possible to cause stopper portions  5  to surely prevent the positional shifts of cylindrical batteries  1 , and to prevent/suppress the cylindrical batteries  1  from rotating. This is because each protrusion  6   a  and each back surface of stopper portion  5 , which are brought into local contact with each other, are slightly deformed, thus making it possible to absorb the dimensional error. 
     Stopper portions  5  illustrated in  FIG. 7  are elastic arms  5 A elastically deformed and thrust against cylindrical batteries  1 . Elastic arms  5 A are provided integrally with holder body  3 . Holder body  3  is provided with elastic arms  5 A by integrally molding plastic. Holder body  3  manufactured by integrally molding elastic arms  5 A can be mass-produced at low cost. 
     Holder body  3  is provided with holding spaces  13  into which cylindrical batteries  1  are inserted. Holding spaces  13  are provided in holder body  3  so as to arrange the plurality of cylindrical batteries  1  in multi-stages and multi-columns of a bale stack. Moreover, in order that cylindrical batteries  1  can be smoothly inserted into holding spaces  13 , each of holding spaces  13  is molded so as to have an inner shape slightly larger than an outer shape of each of cylindrical batteries  1 , for example, have the inner diameter larger than the outer diameter of each of cylindrical batteries  1  by 0.1 mm to 0.3 mm inclusive. As illustrated in the cross-sectional view of  FIG. 5 , holder body  3  that arranges cylindrical batteries  1  in multi-stages and multi-columns of a bale stack is provided with insertion spaces  14  for push rods  6  in regions each of which is surrounded by three cylindrical batteries  1 . Cylindrical batteries  1  arranged in a bale stack are provided with insertion spaces  14  in each of which an entire shape is a substantially triangular prism shape. Each insertion space  14  is provided in a region surrounded by three cylindrical batteries  1  arranged in adjacent columns, in which, between cylindrical batteries  1  arranged in the same column, one cylindrical cell  1  in the adjacent column is arranged. Since each insertion space  14  is surrounded by three cylindrical batteries  1 , insertion space  14  has a substantially triangular prism shape in which each side is curved inward. 
     Between insertion spaces  14  and cylindrical batteries  1 , holder body  3  of  FIGS. 4 and 7  is provided with stopper portions  5  as “pairs of stopper portions  5 ”, which are composed of two elastic arms  5 A pushing out the surfaces of two cylindrical batteries  1 , such that the pair of stopper portions  5  have an inverse V shape in plan view. In each pair of stopper portions  5 , rear ends of elastic arms  5 A are integrally connected to holder body  3 . Holder body  3  is provided with separation slits  15  along both side edges of stopper portions  5 . Each separation slit  15  is formed into a shape of separating stopper portion  5  from holder body  3  and being easily elastically deformed by being pushed by push rod  6 . Stopper portions  5  in  FIG. 4  are rectangular elastic arms  5 A elongated in the insertion direction of push rods  6 , and each elastic arm  5 A separates both side edges and a tip end edge from holder body  3 , and couples a lower end edge integrally to holder body  3 . Each elastic arm  5 A has the both side edges separated from holder body  3  by separation slits  15 , and has the tip end edge arranged on the surface of holder body  3  and separated from holder body  3 . Since each elastic arm  5 A has three sides separated from holder body  3 , elastic arm  5 A is elastically deformed by being pushed by push rod  6  from the back surface, and is thrust against cylindrical cell  1 . 
     In holder body  3  illustrated in the cross-sectional view of  FIG. 6  and the perspective view of  FIG. 7 , in each triangular prism insertion space  14  surrounded by three cylindrical batteries  1 , a pair of stopper portions  5  are provided at opposite positions on two sides of such a triangular prism, and on the remaining one side, stopper portion  5  is not provided, but cover portion  7  that is not elastically deformed is provided. Stopper portion  5  is elastically deformed by push rod  6  inserted into insertion space  14  to press cylindrical cell  1 , but cover portion  7  is arranged along the surface of cylindrical cell  1  without being elastically deformed. Each of cylindrical batteries  1  arranged in multi-stages and multi-columns is pressed by one stopper portion  5  to be arranged at a fixed position. Hence, holder body  3  has a pair of stopper portions  5  arranged thereon such that one stopper portion  5  can be pressed against each of all cylindrical batteries  1 . 
     Since holder body  3  is provided with separation slits  15  on both side edges of each stopper portion  5 , separation slits  15  expose a part of the surface of cylindrical cell  1  to insertion space  14 . Holder body  3 , in which three cylindrical batteries  1  are arranged around substantially triangular insertion space  14  and stopper portions  5  are provided on the surfaces of two cylindrical batteries  1 , partially exposes the surfaces of two cylindrical batteries  1  to insertion space  14 , and does not expose the surface of one cylindrical cell  1  to insertion space  14 . This is because stopper portions  5  partially expose the surfaces of cylindrical batteries  1  to insertion space  14 , and because cover portion  7  does not expose the surface of cylindrical cell  1  to insertion space  14 . Two sets of cylindrical batteries  1  of which surfaces are partially exposed to insertion space  14  are connected in parallel to each other via bus bar  11 . 
     Cylindrical cell  1  of which surface is insulated by being covered with cover portion  7  and is not exposed to insertion space  14  is connected, via bus bar  11 , in series to cylindrical batteries  1  of which surfaces are exposed. Cylindrical batteries  1  connected in parallel to each other do not need to be insulated because exterior cans of cylindrical batteries  1  have the same potential, and even if the surfaces of cylindrical batteries  1  are partially exposed to same insertion space  14 , there occurs no harmful effect such as electric leakage. Cylindrical cell  1  connected in series has a potential difference in an exterior can, and therefore needs to be arranged in an insulated manner. This is because a harmful effect such as electric leakage occurs if insulation characteristics are deteriorated. Cylindrical cell  1  arranged inside cover portion  7  is covered with cover portion  7 , and does not cause the surface to be exposed to insertion space  14 . Hence, since this cylindrical cell  1  is arranged so as to be sufficiently insulated from insertion space  14 , cylindrical cell  1  can be arranged in holder body  3  while preventing a harmful effect due to electric leakage. 
     In cell module  100  illustrated in  FIG. 1 , end face electrodes at both ends of each cylindrical cell  1  are connected to bus bar  11  via lead wires  12 . Each bus bar  11  illustrated in the drawing is a plate-shaped metal sheet, and is arranged between the columns of cylindrical batteries  1  connected in parallel to each other. Bus bars  12  connect cylindrical batteries  1 , which are arranged in the same column, in parallel to one another, and in addition, connect cylindrical batteries  1 , which are placed in adjacent columns, in series to one another. 
     Sub holders  4  have push rods  6  arranged at positions of pressing stopper portions  5 . Push rod  6  illustrated in the perspective view of  FIG. 8  has a substantially triangular prism shape as a whole, and along tip end edges of the triangle, is provided with protrusions  6   a  that press the back surfaces of stopper portions  5 . Protrusions  6   a  are provided as ridges that protrude on two sides of the triangle, and presses stopper portions  5  from the back surfaces. 
     In holder  2  illustrated in the above drawings, sub holders  4  are stacked on the top and bottom of holder body  3  in the drawings. This holder  2  has stopper portions  5  provided at both ends of each holding space  13  provided in holder body  3 , and has a structure of holding both end portions of cylindrical batteries  1 , which are accommodated in holder body  3 , by stopper portions  5  in a state in which sub holders  4  are coupled to the top and bottom of holder body  3 . Since this structure holds both ends of cylindrical batteries  1  by stopper portions  5 , this structure has features that the positional shifts of cylindrical batteries  1  can be effectively inhibited, and that the cylindrical batteries  1  can be prevented/suppressed from rotating. However, the holder can also be provided with the stopper portion only on one side of the holding space provided in the holder body. In this case, the push rod can be provided only in the sub holder coupled to the side of the holder body, on which the stopper portion is provided. Further, the holder body may be divided into a plurality of divided holders by dividing the holder body in an axial direction of the cylindrical batteries. 
     Moreover, in cell module  100  described above, holder body  3  is provided with elastically deformed elastic arms  5 A as stopper portions  5 , and in the cell module of the present invention, a part or all of the holder body can be formed as a rubbery holder formed by molding a rubbery elastic body. In  FIGS. 9 to 16 , a cell module having this structure is illustrated as a cell module according to another exemplary embodiment of the present invention. 
     Cell module  200  illustrated in  FIGS. 9 to 16  includes: a plurality of cylindrical batteries  1 ; holder  20  in which cylindrical batteries  1  are arranged in a parallel posture; bus bars  11  which connect cylindrical batteries  1  in series and in parallel to one another; and circuit board  10  that mounts thereon a protection circuit of cylindrical batteries  1 . Holder  20  includes: holder body  23  having holding spaces  33  for cylindrical batteries  1 ; and sub holder  24  stacked on holder body  23 . 
     Holder body  23  includes rubbery holder  22  formed by molding a rubbery elastic body. Rubbery holder  22  includes: holding spaces  32  in which cylindrical batteries  1  are arranged; and insertion spaces  34  into which push rods  26  protruding from sub holder  24  are inserted. Elastically deformable stopper portions  25  are formed between these insertion spaces  34  and surfaces of rubbery holder  22 , which face cylindrical batteries  1 . Sub holder  24  includes push rods  26  that are inserted into insertion spaces  34  of rubbery holder  22  in a state of being coupled to holder body  23  and elastically deform stopper portions  25  to push stopper portions  25  toward cylindrical batteries  1 . In this holder  20 , in a state of coupling sub holder  24  to holder body  23 , push rods  26  inserted into insertion spaces  34  thrust stopper portions  25  against cylindrical batteries  1 , and inhibit the positional shifts of cylindrical batteries  1  in holding spaces  33 , and prevent/suppress cylindrical batteries  1  from rotating. 
       FIGS. 10, 12, and 16  are views illustrating a state in which sub holder  4  is coupled to holder body  3  and push rods  26  inserted into insertion spaces  34  of rubbery holder  22  thrust stopper portions  25  against cylindrical batteries  1 . As illustrated in  FIGS. 11 and 12 , in cell module  200 , sub holder  24  is coupled to holder body  23 , and push rods  26  are inserted into insertion spaces  34  of rubbery holder  22 . An outer shape of each of push rods  26  inserted into corresponding insertion space  34  is larger than an inner shape of each of insertion spaces  34 , and in a state in which push rods  26  are inserted into insertion spaces  34 , push rods  26  elastically deform stopper portions  25  located between insertion spaces  34  and surfaces of rubbery holder  22 , which face cylindrical batteries  1 , and press the surfaces of stopper portions  25  against cylindrical batteries  1 . The surfaces of stopper portions  25  are thrust against cylindrical batteries  1  to inhibit the positional shifts of cylindrical batteries  1  and to prevent/suppress cylindrical batteries  1  from rotating. This is because frictional resistance between stopper portions  25  and cylindrical batteries  1  increases. Stopper portions  25  are pressed from back surfaces by push rods  26  and are elastically deformed. The elastically deformed surfaces of stopper portions  25  are thrust against the surfaces of cylindrical batteries  1 . 
     Holder body  23  illustrated in  FIGS. 10 and 11  includes: plastic holder  21  that holds respective cylindrical batteries  1  in a parallel posture; and rubbery holder  22  that is stacked on this plastic holder  21  and holds end portions of cylindrical batteries  1  inserted into plastic holder  21 . Plastic holder  21  is provided with holding spaces  31  each of which accommodates almost the entire cylindrical cell  1  except one end portion. At positions facing holding spaces  31  provided in plastic holder  21 , rubbery holder  22  is provided with holding spaces  32  into which the end portions of cylindrical batteries  1  are inserted. These holding spaces  31  and  32  are provided so as to arrange the plurality of cylindrical batteries  1  in multi-stages and multi-columns of a bale stack. 
     Holding spaces  31  of plastic holder  21  and holding spaces  32  of rubbery holder  22  are provided at positions facing each other, and in a state in which rubbery holder  22  is stacked on plastic holder  21 , columnar holding spaces  33  that go along the surfaces of cylindrical batteries  1  are formed of holding spaces  31  and  32  that are coupled to each other. In order that cylindrical batteries  1  can be smoothly inserted into holding spaces  33 , each of holding spaces  33  is molded so as to have an inner shape slightly larger than an outer shape of each of cylindrical batteries  1 , for example, have the inner diameter larger than the outer diameter of each of cylindrical batteries  1  by 0.1 mm to 0.3 mm inclusive. 
     Moreover, in holder body  23 , as illustrated in  FIGS. 10, 12, and 13 , in order that rubbery holder  22  can be coupled to a fixed position of plastic holder  21 , coupling holes  37  are provided in rubbery holder  22 , and plastic holder  21  is provided with positioning pins  27  inserted into coupling holes  37 . Holder body  23  is provided with each of coupling holes  37  and each of positioning pins  27  in a region on an opposing surface of plastic holder  21  and rubbery holder  22 , the region being surrounded by three cylindrical batteries  1  arranged in a bale stack. In a posture of protruding in the axial direction of cylindrical batteries  1  from an end surface of plastic holder  21 , on which rubbery holder  22  is stacked, positioning pins  27  are provided on plastic holder  21  by being molded integrally therewith. In this holder body  23 , rubbery holder  22  is coupled to the fixed position of plastic holder  21  in a state of guiding positioning pins  27 , which protrude from the end surface of plastic holder  21 , to coupling holes  37 . 
     Rubbery holder  22  is formed by molding a rubbery elastic body into a plate shape having a predetermined thickness. Rubbery holder  22  illustrated in  FIGS. 10, 12 and 13  is provided with insertion spaces  34 , into which push rods  26  of sub holder  24  are inserted, along peripheries of holding spaces  32  formed in a circular shape in plan view. Rubbery holder  22  illustrated in the drawings has a structure in which two to four insertion spaces  34  are provided around one holding space  32  and one cylindrical cell  1  is pressed and held from a plurality of surrounding spots. Each of insertion spaces  34  illustrated in the drawings is a through hole opened through plate-shaped rubbery holder  22 , and has a cylindrical shape as an inner shape. Insertion space  34  provided along the periphery of holding space  32  is preferably provided in a region surrounded by three cylindrical batteries  1 . Moreover, insertion spaces  34  arranged along an outer periphery of rubbery holder  22  are provided so as to face valleys of cylindrical batteries  1  adjacent to each other and an outer circumference of one cylindrical cell  1 . As described above, it is made possible to press and hold such an outer circumferential surface of one cylindrical cell  1  from a plurality of spots. 
     Rubbery holder  22  defines portions between insertion spaces  34  and surfaces of rubbery holder  22 , which face cylindrical batteries  1 , as elastically deformable stopper portions  25 . In a state in which push rods  26  are inserted into insertion spaces  34 , this rubbery holder  22  elastically deforms stopper portions  25  into a shape protruding toward cylindrical batteries  1 , and presses the surfaces of cylindrical batteries  1 . Hence, such a structure in which each of insertion spaces  34  is provided in the region surrounded by three cylindrical batteries  1  can cause each push rod  26  inserted into one insertion space  34  to protrude stopper portion  25  in a state of elastically deforming stopper portion  25  in three directions, and to press cylindrical batteries  1  facing stopper portion  25  in three directions. As described above, the structure in which a part of rubbery holder  22  molded of a rubbery elastic body is elastically deformed and pressed against the surfaces of cylindrical batteries  1  has a feature in that the rubbery elastic body having large frictional resistance can surely inhibit the positional shifts of the cylindrical batteries and can prevent/suppress the cylindrical batteries from rotating. The surfaces of stopper portions  25  illustrated in the drawings are formed as curved surfaces  25   a  that go along the surfaces of cylindrical batteries  1 . 
       FIG. 14  is a perspective view of rubbery holder  22 . In rubbery holder  22  illustrated in the drawing, an opening edge portion of the through hole, which is each insertion space  34  into which push rod  26  is inserted, is formed as a tapered surface. This structure can cause push rod  26 , which has an outer shape larger than the inner shape of insertion space  34 , to be press-fitted while being smoothly guided. 
     Sub holder  24  includes the plurality of push rods  26 , which are inserted into insertion spaces  34  of rubbery holder  22  in a state of being coupled to holder body  23 , by molding push rods  26  integrally therewith.  FIG. 15  is an enlarged perspective view of push rods  26  provided on sub holder  24 . Push rods  26  illustrated in  FIG. 15  are provided with protrusions  26   a , which locally push out the back surfaces of stopper portions  25  in a state of being press-fitted into insertion spaces  34 , so that protrusions  26   a  protrude from the surfaces of columnar rod bodies. Protrusions  26   a  are formed as ridges that extend in an insertion direction of push rods  26  along the side surfaces of such columnar rod bodies such that push rods  26  can be smoothly inserted into insertion spaces  34 , and that the surfaces of cylindrical cell cells  1  can be pressed in the axial direction by stopper portions  25 . In push rods  26  illustrated in  FIG. 16 , protrusions  26   a  provided on outer circumferential surfaces of push rods  26  are caused to have a posture protruding toward centers of facing cylindrical batteries  1  such that stopper portions  25  can be surely elastically deformed toward facing cylindrical batteries  1 . As illustrated in  FIG. 16 , push rods  26  provided with protrusions  26   a  protruding toward facing cylindrical batteries  1  have a feature of being capable of surely pressing stopper portions  25  toward the surfaces of cylindrical batteries  1 . 
     Moreover, push rods  26  illustrated in  FIGS. 15 and 16  change a number and orientation of protrusions  26   a  according to a number of cylindrical batteries  1 , which are arranged around push rods  26 , such that stopper portions  25  can be pressed toward the plurality of facing cylindrical batteries  1 . Push rods  26  shown in  FIGS. 15 and 16  include: first rods  26 A each of which is provided with three linear protrusions  26   a  protruding in three directions; second rods  26 B each of which is provided with two linear protrusions  26   a  protruding in two directions; and third rods  26 C each of which is provided with one linear protrusion  26   a  protruding in one direction. Each of first rods  26 A is inserted into insertion space  34  arranged in the region surrounded by three cylindrical batteries  1 , elastically deforms stopper portion  25  made of a rubbery elastic body, and presses three cylindrical batteries  1 . Each of second rods  26 B is inserted into insertion space  34  arranged between two cylindrical batteries  1 , elastically deforms stopper portion  25  made of a rubbery elastic body, and presses two cylindrical batteries  1 . Each of third rods  26 C is inserted into insertion space  34  facing one cylindrical cell  1 , elastically deforms stopper portion  25  made of a rubbery elastic body, and presses one cylindrical cell  1 . As described above, push rods  26  having predetermined shapes are inserted into the plurality of insertion spaces  34  arranged around the holding spaces  32 , whereby the surfaces of respective cylindrical batteries  1  are pressed from a plurality of peripheral spots, thus making it possible to ideally inhibit the positional shifts of the cylindrical batteries, and to prevent/suppress the cylindrical batteries from rotating. 
     Holder body  23  illustrated in the above drawings has a structure in which rubbery holder  22  is stacked only on one side (upper side in the drawings) of plastic holder  21 . Hence, holder  20  illustrated in these drawings has a structure in which sub holder  24  is coupled only to one side of holder body  23 . This holder  20  has a simple structure as a whole, and holds the end portions of cylindrical batteries  1  accommodated in holder body  23  by stopper portions  25 , thus making it possible to prevent the positional shifts of cylindrical batteries  1 , and to prevent/suppress cylindrical batteries  1  from rotating. However, as a structure of stacking rubbery holders on both sides of a plastic holder, the holder can also adopt a structure of stacking the sub holders on both sides of the holder body. Since this structure holds both ends of the cylindrical batteries by the stopper portions, this structure has features that the positional shifts of the cylindrical batteries can be effectively inhibited, and that the cylindrical batteries can be prevented/suppressed from rotating. 
     INDUSTRIAL APPLICABILITY 
     The present invention is a cell module in which cylindrical batteries are arranged at fixed positions by a holder, and particularly, can be suitably used as a cell module capable of inhibiting positional shifts and rotation of the cylindrical batteries. 
     REFERENCE MARKS IN THE DRAWINGS 
     
         
         
           
               100 ,  200  cell module 
               2  cylindrical cell 
               3  holder 
               3  holder body 
               4  sub holder 
               5  stopper portion 
               5 A elastic arm 
               5   a  curved surface 
               6  push rod 
               6   a  protrusion 
               7  cover portion 
               10  circuit board 
               11  bus bar 
               12  lead wire 
               13  holding space 
               14  insertion space 
               15  separation slit 
               20  holder 
               21  plastic holder 
               22  rubbery holder 
               23  holder body 
               24  sub holder 
               25  stopper portion 
               25   a  curved surface 
               26  push rod 
               26   a  protrusion 
               26 A first rod 
               26 B second rod 
               26 C third rod 
               27  positioning pin 
               31  holding space 
               32  holding space 
               33  holding space 
               34  insertion space 
               37  coupling hole