JP5849957B2 - Electrochemical cell module and holder - Google Patents

Description

  The present invention relates to an electrochemical cell module in which a plurality of electrochemical cells are assembled and a holder used in the electrochemical cell module.

  In JP-A-2006-99997 (Patent Document 1), a plurality of columnar batteries (a type of electrochemical cell) having a convex electrode at one end and a planar electrode at the other end are arranged in parallel. A battery module (electrochemical cell module) having a structure in which holders are disposed at both ends of an assembled battery (cell group) and a support column is provided between two holders to define a space between the two holders is disclosed. The plurality of batteries are electrically connected to a metal bus bar that is insert-molded in the holder. The holder is provided with a terminal fitting for taking out the output from the battery module. Japanese Patent Application Laid-Open No. 2003-45504 (Patent Document 2) and Japanese Patent Application Laid-Open No. 2001-325931 (Patent Document 3) also disclose battery modules configured using similar holders.

JP 2006-99997 A JP 2003-45504 A JP 2001-325931 A

  In the conventional electrochemical cell module, since the holder which insert-molded the bus bar is used, the versatility of the holder was low. Therefore, the inventor of the present application considered making a cell assembly in which a bus bar was connected in advance to a cell group, and fitting a holder to both ends of the cell assembly. The inventor initially considered the holder for the end fitting concave portion of the cell having a shape corresponding to the convex electrode and the planar electrode of the columnar electrochemical cell in consideration of the arrangement direction of the plurality of columnar electrochemical cells. A prepared holder was produced. However, it has been found that such a holder is not versatile because it cannot be used when the cell orientation changes.

  An object of the present invention is to provide an electrochemical cell module having a highly versatile holder and a holder suitable for use in the electrochemical cell module.

  The present invention is directed to an electrochemical cell module obtained by modularizing battery chemical cells such as batteries and capacitors. The electrochemical cell module of the present invention includes a cell assembly and first and second holders. The cell assembly includes a cell group in which a plurality of columnar electrochemical cells each having a convex electrode at one end and a planar electrode at the other end are arranged in parallel, and a plurality of columnar electrochemical cells in the cell group. A plurality of bus bars are arranged on both sides in the extending direction. The plurality of bus bars are formed by connecting a plurality of electrochemical cells with a predetermined wiring pattern so that a convex electrode and a planar electrode, a convex electrode and a convex electrode, or a planar shape of two adjacent columnar electrochemical cells. Connect the electrode and the planar electrode. In the present specification, the convex electrode may of course be provided with a planar electrode portion around the convex electrode. The planar electrode does not need to have a completely flat surface and may have some unevenness on the surface. Further, in the present specification, “two adjacent columnar electrochemical cells” simply mean two adjacent columnar electrochemical cells among a plurality of columnar electrochemical cells, and can be connected by one bus bar. It does not mean that the number of cells is limited to two. For example, the present invention includes a case where four cells are connected by one bus bar.

  A 1st holder is fitted by the end located in the direction where the several columnar electrochemical cell of a cell assembly is extended. The second holder is fitted to the other end located in the direction in which the plurality of columnar electrochemical cells of the cell assembly extend. The 1st and 2nd holder is provided with the some edge part fitting recessed part by which the edge part of several columnar electrochemical cell is fitted. And the buffer spacer is arrange | positioned in the compression state between the bottom part of the recessed part for several edge part fitting, and a bus bar. When such a buffer spacer is used, the space between a part of the bus bar and the bottom of the end fitting recess is filled with the buffer spacer compressed and deformed regardless of the cell arrangement direction. The assembly can be held between the first and second holders without backlash.

  It is preferable that a spacer receiving recess for receiving the buffer spacer in a compressible state is formed at the bottom of the end fitting recess. Since the position of the buffer spacer is fixed by providing such a spacer receiving recess, the buffer spacer can be reliably positioned between a part of the bus bar and the bottom of the end fitting recess.

  Further, it is preferable that through holes that are aligned (overlap) are formed at the bottoms of the buffer spacer and the spacer receiving recess. If such a through hole is provided, after assembling the electrochemical cell module, not only can the direction of the cell be confirmed through the through hole, but also the electrical performance can be confirmed by bringing the measurement terminal into contact with the electrode through the through hole. Therefore, inspection after assembly is facilitated.

  One bus bar may include one or more terminal portions for external connection. Even when not all bus bars are provided with a terminal portion for external connection, the module is included in the present invention. The first and second holders include a bottom wall portion and a peripheral wall portion. The bottom wall portion faces one end or the other end of the cell assembly. The peripheral wall portion rises from the peripheral edge portion of the bottom wall portion and extends toward the cell assembly side. The peripheral wall portion includes two or more openings that communicate with at least one of the at least two end fitting recesses communicating to receive the bus bar and allow the terminal portion of the bus bar to go outside. It is preferable. If there is an opening in the holder, the terminal part of the electrochemical cell module can be obtained simply by taking out the terminal part provided on the bus bar from the opening.

  In particular, one opening is formed in the peripheral wall portion surrounding the two end fitting recesses communicating with each other so as to receive the bus bar, corresponding to an intermediate position between the two end fitting recesses, The same holder is used when connecting multiple columnar electrochemical cells with various wiring patterns such as parallel, series, and series-parallel, by forming another opening that opens in the direction in which the two end fitting recesses are aligned. It becomes possible to increase the versatility of the holder.

  The holder may have all of the plurality of end fitting recesses connected in series, or the plurality of end fitting portions may be communicated in a closed loop. Embodiments are arbitrary.

  Further, four through holes for drawing out the voltage detection lead wires may be formed in the bottom wall portion of the holder with an angular interval of 90 ° around the center of the bottom wall portion. By providing a through-hole for drawing out the voltage detection lead wire in this way, the voltage detection lead wire is not routed so long no matter what positional relationship the holder is fitted to the cell assembly. It can be pulled out from any one of the four through holes.

  The holder of the present invention includes a cell group in which a plurality of columnar electrochemical cells each having a convex electrode at one end and a planar electrode at the other end are arranged in parallel, and the columnar electrochemical cell in the cell group extends in the extending direction. Convex electrode and planar electrode, convex electrode and convex electrode or surface of two adjacent columnar electrochemical cells arranged on both sides to connect a plurality of electrochemical cells with a predetermined wiring pattern The cell assembly composed of a plurality of bus bars connecting the planar electrodes and the planar electrodes is fitted to one end located in the extending direction of the plurality of columnar electrochemical cells. The holder is fitted with a bottom wall portion facing one end of the cell assembly, a peripheral wall portion rising from the peripheral edge of the bottom wall portion and extending to the cell assembly side, and end portions of a plurality of columnar electrochemical cells. A plurality of end fitting recesses and a cushioning spacer provided in the center of the bottoms of the plurality of end fitting recesses and arranged in a compressed state between the bottoms of the plurality of end fitting recesses and the bus bar And a plurality of recesses for receiving spacers. The peripheral wall portion is provided with two or more openings that communicate with at least one of the two or more end fitting recesses communicating to receive the bus bar and allow the terminal portion of the bus bar to go outside. Yes.

  More specifically, the holder is fitted to a cell assembly having a cell group in which four columnar electrochemical cells are arranged in parallel so that two columnar electrochemical cells are arranged side by side. Therefore, the holder is formed with four end fitting recesses into which the end portions of the four columnar electrochemical cells are fitted, and four spacer receiving recesses. The holder corresponding to the four columnar electrochemical cells has two recess rows made of two end fitting recesses communicating with each other, and two portions of the peripheral wall corresponding to the center position of the two recess rows Each has one opening, and one opening may be formed in each of two portions of the peripheral wall corresponding to one end of the two recess rows. Further, two recess rows composed of two end fitting recesses communicating with each other are arranged, and one of the fitting recesses included in one of the two recess rows and one end fitting recess included in the other. One opening is formed in each of the two portions of the peripheral wall portion corresponding to the center position of the two recess rows, and two locations of the peripheral wall portion corresponding to one end of the two recess rows are communicated. One opening may be formed in each part. Further, two recess rows made of two end fitting recesses communicating with each other are arranged, one end fitting recess included in one of the two recess rows, and one end fitting recess included in the other, Are communicated with each other, and the remaining one end fitting recess included in one of the two recess rows communicates with the remaining one end fitting recess included in the other. One opening may be formed in each of two portions of the peripheral wall corresponding to the central position. Further, a first recess row composed of two communicating end fitting recesses and a second recess row composed of two end fitting recessed portions not communicating are arranged side by side, and the two constituting the second recess row One opening may be formed in each of the peripheral wall portions surrounding the end fitting recess.

  When the peripheral wall portion of the holder is constituted by four side wall portions having the same length dimension and orthogonal to each other, it is preferable that the attachment holes are respectively formed at the same diagonal positions of the four side wall portions. . If such attachment holes are formed, when a plurality of holders are connected, the holders can be connected using the attachment holes regardless of the position of the opening provided in the holder.

It is a perspective view used in order to demonstrate the structure of the electrochemical cell module of this Embodiment. It is sectional drawing of the electrochemical cell module of embodiment of FIG. (A) is a perspective view of the holder used in the embodiment of FIG. 1, (B) is a plan view of the holder used in the embodiment of FIG. 1, and (C) is a bottom view of the holder used in the embodiment of FIG. , (D) is a right side view of the holder used in the embodiment of FIG. 1, (E) is a sectional view taken along line IIIE-IIIE in FIG. 3 (B), and (F) is a holder of the holder used in the embodiment of FIG. It is a left side view. It is a perspective view of other embodiment of the holder of this invention. It is a perspective view of other embodiment of the holder of this invention. It is a perspective view of other embodiment of the holder of this invention.

  Hereinafter, embodiments of an electrochemical cell module and a holder of the present invention will be described with reference to the drawings. FIG. 1 shows a perspective view used for explaining the configuration of the electrochemical cell module 1 of the present embodiment, and FIG. 2 shows the II-II line of the electrochemical cell module 1 of the embodiment of FIG. It is sectional drawing. In FIG. 2, the cell is not cross-sectional.

  The electrochemical cell module 1 includes a cell assembly 3 and first and second holders 5 and 7. As shown in FIG. 1, the cell assembly 3 includes four columnar lithium ion capacitors 13 </ b> A to 13 </ b> D that are one type of columnar electrochemical cells each having a convex electrode 9 at one end and a planar electrode 11 at the other end. The cell group 15 arranged in parallel and the four lithium ion capacitors 13A to 13D included in the cell group 15 are arranged on both sides in the extending direction and welded to the electrodes of the four lithium ion capacitors 13A to 13D. Bus bars 17-20. The lithium ion capacitors 13A to 13D have a structure in which the outer surface of the can is covered with an insulating resin tube. In this example, four bus bars 17 to 20 form a wiring pattern in which two sets of cell units in which two lithium ion capacitors 13A and 13B and two lithium ion capacitors 13C and 13D are connected in series are connected in parallel. The convex electrode 9 and the convex electrode 9, and the planar electrode 11 and the planar electrode 11 of two adjacent lithium ion capacitors 13A to 13D are connected to each other. The four bus bars 17 to 20 are formed by press-molding a conductive material or copper material having a low resistance value such as nickel, iron, copper, or aluminum and tin-plated or nickel-plated. Of course, the shape and number of bus bars to be used differ depending on the wiring pattern constituted by the four lithium ion capacitors 13A to 13D. The bus bars 17 and 18 used in the present embodiment include through holes 17A and 18A and terminal portions 17B and 18B that expose the tips of the convex electrodes 9 when connected to the convex electrodes 9. The bus bars 19 and 20 include through-holes 19A and 20A and terminal portions 19B and 20B that partially expose the planar electrode 11 when connected to the planar electrode 11. In the present embodiment, the bus assembly 17 is configured in advance by connecting the bus bars 17 to 20 to the electrodes (9, 11) of the electrochemical cell 13 by soldering or resistance welding.

  The first holder 5 is fitted to one end of the cell assembly 3 positioned in the direction in which the lithium ion capacitors 13A to 13D extend. The second holder is fitted to the other end of the cell assembly 3 positioned in the direction in which the lithium ion capacitors 13A to 13D extend. In the present embodiment, the holders having the same shape shown in FIGS. 3A to 3F are used as the first and second holders 5 and 7. The second holder 7 is fitted to the cell assembly 3 in a posture rotated by 90 ° with respect to the first holder 5.

  Hereinafter, the structure of the holder 5 will be described with reference to FIG. The holder 5 used in the present embodiment is integrally formed of an insulating resin material and includes a bottom wall portion 21 and a peripheral wall portion 22. The bottom wall portion 21 has a substantially rectangular outline and faces one end or the other end of the cell assembly 3. A center hole 23 into which a screw with a head (not shown) for fixing the support 16 shown in FIG. 1 is inserted is formed in the bottom wall portion 21. Further, as shown in FIG. 3C, the two opposite sides 21A and 21C among the four sides 21A to 21D of the bottom wall portion 21 are formed so as to protrude toward the center hole 23 and are bottom. Semicircular arc-shaped recesses 21 </ b> E and 21 </ b> F penetrating in the thickness direction of the wall portion 21 and opening away from the center hole 23 are formed. The recesses 21E and 21F are used for exposing the terminal portion of the bus bar. The bottom wall portion 21 has voltage detection leads at positions where a virtual line L1 orthogonal to the sides 21A and 21C and passing through the central hole 23 and a virtual line L2 orthogonal to the sides 21B and 21D and passing through the central hole 23 pass. Four through holes 24 having a diameter through which a wire can pass are formed. The four through-holes 24 are formed at an angular interval of 90 ° around the center hole 23, respectively. If the through hole 24 for drawing out the voltage detection lead wire is provided in this way, the voltage detection lead wire is pulled too long regardless of the positional relationship between the holder 5 and the cell assembly 3. Without turning, it can be pulled out from any one of the four through holes 24. Furthermore, four through holes 25 are formed in the bottom wall portion 21 so as to be positioned on two diagonal lines assumed for the four corner portions of the bottom wall portion 21. The function of the through hole 25 will be described later. Further, two through holes 26 are formed in the bottom wall portion 21 at positions where the above-described virtual line L2 passes. This through hole is an attachment hole.

  The peripheral wall portion 22 that rises from the peripheral edge portion of the bottom wall portion 21 and extends toward the cell assembly 3 side is composed of four side wall portions 22A to 22D that have the same length and are orthogonal to each other. A pair of opening portions 22E and 22F communicating with a pair of recesses 21E and 21F formed in the bottom wall portion 21 are formed in the pair of opposing side wall portions 22A and 22C. In addition, two openings 22G and 22H are formed in the side wall 22B.

  In the holder 5, four end fitting recesses 28 </ b> A to 28 </ b> D that are surrounded by the bottom wall portion 21 and the peripheral wall portion 22 and into which the end portions of the four lithium ion capacitors 13 </ b> A to 13 </ b> D are fitted. There is. The four end fitting recesses 28 </ b> A to 28 </ b> D are provided with spacer accommodating recesses 30 </ b> A to 30 </ b> D for accommodating buffer spacers 29 arranged in a compressed state between the bus bars 17 to 20 and the bottom wall portion 21. I have. The buffer spacer 29 is made of a ring-shaped rubber. If such a buffer spacer 29 is provided, the two holders 5 and 7 are connected to one of the bus bars 17 to 20 by the buffer spacer 29 compressed and deformed regardless of the arrangement direction of the four lithium ion capacitors. The cell assembly 3 can be held between the first and second holders 5 and 7 by filling a space between the portion and the bottom of the end fitting recesses 28 </ b> A to 28 </ b> D.

  Of the four end fitting recesses 28A to 28D, the two end fitting recesses 28A and 28D communicate with each other so as to receive the bus bar 18 disposed across the two lithium ion capacitors 13A and 13D. . Further, the two end fitting recesses 28B and 28C communicate with each other so as to receive the bus bar 17 disposed across the two lithium ion capacitors 13B and 13D. As a result of adopting such a configuration, one partition wall portion 31 is formed in the holder 5.

  In the present embodiment, the side wall portion 22A of the peripheral wall portion 22 surrounding the two end portion fitting recesses 28A and 28D communicating with each other so as to receive the bus bar 18 has an intermediate position between the two end portion fitting recesses 28A and 28D. Are formed in the side wall portion 22C of the peripheral wall portion 22 surrounding the two end fitting recesses 28B and 28C communicating with each other so as to receive the bus bar 17. One opening 22F is formed corresponding to an intermediate position between the fitting recesses 28B and 28C, and an opening 22G and two end fittings that open in the direction in which the two end fitting recesses 28A and 28D are arranged. An opening 22H that opens in the direction in which the combination recesses 28B and 28C are arranged is formed in the side wall 22B. In this example, the openings 22G and 22H open in the same direction, but one of the two openings 22G and 22H is formed on the side wall 22D, and the two openings 22G and 22H are opposite to each other. Of course, it may be made to open. When such four openings 22E to 22G are provided in the holders 5 and 7, when connecting a plurality of columnar lithium ion capacitors in various wiring patterns such as parallel, series, and series / parallel, one holder 5 is provided. On the other hand, by rotating the other holder 7 to determine the positional relationship between the two holders, almost all wiring patterns can be realized, and the versatility of the holder is enhanced.

  As shown in FIG. 1, the bus bar 17 is disposed in the two end fitting recesses 28 </ b> B and 28 </ b> C that communicate with the holder 5, and the bus bar 28 is disposed in the two end fitting recesses 28 </ b> A and 28 </ b> D that communicate with the holder 5. Placed in. And the terminal part 17B of the bus bar 17 is extended outside from the opening part 22H, and the terminal part 18B of the bus bar 18 is extended outside from the opening part 22G. The bus bar 19 is disposed in the two end fitting recesses 28 </ b> B and 28 </ b> C that communicate with the holder 7, and the bus bar 20 is disposed in the two end fitting recesses 28 </ b> A and 28 </ b> D that communicate with the holder 7. And the terminal part 19B of the bus bar 19 is extended outside from the opening part 22H, and the terminal part 20B of the bus bar 20 is extended outside from the opening part 2G.

  FIG. 4 is a perspective view of another embodiment of the holder of the present invention. This holder 5 'has the same structure as that of the holder of FIG. 3 except that the partition wall portion 31 partitioning between the end fitting recesses 28C and 28D of the holder 5 shown in FIG. 3 is removed. doing. In the holder 5 'of the present embodiment, the four end fitting recesses 28A to 28D communicate in series in the order of 28A → 28D → 28C → 28B. From another point of view, one recess row made of communicating end fitting recesses 28A and 28D and one recess row 28C made of communicating end fitting recesses 28D and 28C are arranged side by side. One fitting recess 28D included in one of the rows communicates with one end fitting recess 28C included in the other, and the side wall portions 22A and 22C of the peripheral wall portion corresponding to the center position of the two recess rows. One opening 22E and 22F is formed in the central part of each. Openings 22G and 22H are formed in two portions of the peripheral wall portion 22B corresponding to one end of the two recess rows. In this holder 5 ′, the end fitting recesses 28 </ b> C and 28 </ b> D communicate with each other as compared with the holder of FIG. 3, and therefore versatility is further enhanced as compared with the holder 5 of FIG. 3.

  FIG. 5 is a perspective view of still another embodiment of the holder of the present invention. This holder 5 ″ includes the part of the partition wall 31 that partitions the end fitting recesses 28C and 28D of the holder 5 shown in FIG. 3 and the end fitting recess 28A of the holder 5 shown in FIG. The part of the partition wall 31 that partitioned the space 28B is removed, except that the openings 22G and 22H formed in the side wall 22B of the holder 5 in FIG. 3 are closed. 3 has the same structure as the holder 5. In the holder 5 ″ of the present embodiment, four end fitting recesses 28A to 28D communicate in a closed loop shape. In other words, in this holder 5 ″, one recess row composed of communicating end fitting recesses 28A and 28D and one recess row 28C composed of communicating end fitting recesses 28D and 28C are arranged side by side. One fitting recess 28D included in one of the two recess rows communicates with one end fitting recess 28C included in the other, and the remaining one included in one of the two recess rows The end fitting recess 28A communicates with the other end fitting recess 28B included in the other, and the central portions of the side wall portions 22A and 22C of the peripheral wall portions corresponding to the center positions of the two recess rows. One opening 22E and 22F is formed in each portion. In this holder 5 ″, the number of openings is halved compared to the holder of FIG. Communicating in a closed loop And for that versatility is increased to the same extent as the holder 5 in FIG.

  FIG. 6 is a perspective view of still another embodiment of the holder of the present invention. In this holder 5 *, the partition wall portion 31 ', the first recess row composed of two end fitting recesses 28C and 28D communicating with each other, and the second end fitting recess 28A and 28B not communicating with each other are provided. Are arranged in parallel with the recess rows. One opening 22E and 22F is formed in each of the peripheral wall portions (side walls 22A and 22C) surrounding the two end fitting recesses 28A and 28B constituting the second recess row. In this holder 5 *, there is no opening for pulling out the bus bar to the outside of the first recess row composed of the two end fitting recesses 28C and 28D that communicate with each other. Such a structure is not particularly problematic.

  A large-capacity electrochemical cell module can be configured by assembling a plurality of the electrochemical cell modules 1 of the above embodiment and electrically connecting them together.

  Moreover, in the said embodiment, although the lithium ion capacitor was used as an electrochemical cell, it is needless to say that an electric double layer capacitor, a lithium ion battery, and another secondary battery may be used as an electrochemical cell.

  Further, in the electrochemical cell module 1 of the above embodiment, the first and second holders 5 and 7 are attracted by the support column 16, but so as to surround the first and second holders 5 and 7 and the cell assembly 3. You may make it attract the 1st and 2nd holders 5 and 7 by arrange | positioning a belt-shaped member and fastening a module from the outside.

  In the above embodiment, the buffer spacer 29 made of a rubber material is used. However, the buffer spacer 29 is formed of a material other than the rubber material as long as it is deformed and elastic when compressed. May be.

  As a result of conducting a vibration test to confirm the effect of the buffer spacer 29, it was confirmed that the vibration resistance was improved by the presence of the buffer spacer 29. In the embodiment shown in FIG. 1, a random vibration test was carried out under the test conditions described below, with and without the buffer spacer 29.

Test conditions Random vibration test
Up and down 4.3G × 5h
Left and right 3.8G × 5h
Front and rear 2.0G × 5h
As a result, due to the contact between the four cells and the holder, the insulating tube covering the outer surface of the cell was scattered in powder form by vibration, and the can was exposed. In contrast, in the present embodiment in which the buffer spacer 29 was inserted, no abnormality was observed in the appearance of the cell. Further, in this embodiment, a vibration test was performed under the condition of an acceleration of 10 G. However, no abnormality was observed in the appearance of the cell, and it was confirmed that the earthquake resistance was improved by inserting a buffer spacer.

  Moreover, although the electrochemical cell module 1 of the said embodiment is equipped with the cell assembly 3 which consists of four electrochemical cells (13A-13D), the number of the electrochemical cells contained in the cell assembly 3 is as follows. It is not particularly limited.

  Further, in the above embodiment, the bus bars 17 to 20 are of a type in which two adjacent electrochemical cells are all connected, but depending on the wiring pattern, the bus bar connected only to the electrode of one electrochemical cell may be electrically connected. Of course, it may be included in the chemical cell module 1.

  In the embodiment of FIG. 1, two holders of the same type are used. Of course, a plurality of types of holders shown in FIGS. 3 to 6 may be used in combination depending on the wiring pattern. is there.

  According to the present invention, since the buffer spacer is arranged, the compression buffer spacer between the part of the bus bar and the bottom of the end fitting recess is compressed regardless of the arrangement direction of the electrochemical cell. The cell assembly can be held between the first and second holders without rattling.

DESCRIPTION OF SYMBOLS 1 Electrochemical cell module 3 Cell aggregate | assembly 5 1st holder 7 2nd holder 9 Convex electrode 11 Planar electrode 13A-13D Lithium ion capacitor (electrochemical cell)
DESCRIPTION OF SYMBOLS 15 Cell group 16 Support | pillar 17-20 Bus bar 21 Bottom wall part 22 Peripheral wall part 22A-22D Side wall part 22E-22H Opening part 23 Center hole 24 Through hole 25 Through hole 26 Through hole 28A-28D End fitting recessed part 29 Buffer spacer 30A to 30D Spacer receiving recess 31 Partition wall

Claims (14)

A cell group in which a plurality of columnar electrochemical cells having a convex electrode at one end and a planar electrode at the other end are arranged in parallel; and a direction in which the plurality of columnar electrochemical cells of the cell group extend The convex electrode, the planar electrode, and the convex electrode of two or more columnar electrochemical cells adjacent to each other so as to connect the plurality of electrochemical cells with a predetermined wiring pattern disposed on both sides And a plurality of bus bars connecting the convex electrode or the planar electrode and the planar electrode,
A first holder fitted to one end located in a direction in which the plurality of columnar electrochemical cells of the cell assembly extend;
A second holder fitted to the other end of the cell assembly located in the extending direction of the plurality of columnar electrochemical cells;
The first and second holders include a plurality of end fitting recesses into which end portions of the plurality of columnar electrochemical cells are fitted,
A buffer spacer is disposed in a compressed state between the bottoms of the plurality of end fitting recesses and the bus bar,
The electrochemical cell module according to claim 1, wherein a spacer-receiving recess for receiving the buffer spacer in a compressible state is formed at the bottom of the end fitting recess.   2. The electrochemical cell module according to claim 1, wherein through holes are formed at the bottoms of the buffer spacer and the spacer receiving recesses, respectively. One said bus bar is provided with one or more terminal parts for external connection,
The holder includes a bottom wall portion that faces the one end or the other end of the cell assembly, and a peripheral wall portion that rises from a peripheral portion of the bottom wall portion and extends toward the cell assembly side. Two or more openings that communicate with at least one of the two or more end fitting recesses that communicate with each other so as to receive the bus bar and allow the terminal portion of the bus bar to go outside. Item 4. The electrochemical cell module according to any one of Items 1 and 3.   One opening is formed in the peripheral wall portion surrounding the two end fitting recesses communicating with each other so as to receive the bus bar, corresponding to an intermediate position between the two end fitting recesses. 5. The electrochemical cell module according to claim 4, wherein another opening that opens in a direction in which the two end fitting recesses are arranged is formed.   The electrochemical cell module according to claim 4, wherein all of the plurality of end fitting recesses communicate in series.   The electrochemical cell module according to claim 4, wherein the plurality of end fitting recesses communicate in a closed loop shape.   5. The electrochemical cell according to claim 4, wherein the bottom wall portion is formed with four through-holes through which a voltage detection lead wire is pulled out at an angular interval of 90 ° around the center of the bottom wall portion. module. A cell group in which a plurality of columnar electrochemical cells having a convex electrode at one end and a planar electrode at the other end are arranged in parallel, and arranged on both sides of the cell group in the direction in which the columnar electrochemical cell extends. The convex electrodes and the planar electrodes, and the convex electrodes and the convex electrodes of the two adjacent columnar electrochemical cells so that the plurality of electrochemical cells are connected with a predetermined wiring pattern. Or a holder fitted to one end of the cell assembly composed of the planar electrode and a plurality of bus bars connecting the planar electrode, the end being located in the extending direction of the plurality of columnar electrochemical cells,
A bottom wall facing the one end of the cell assembly;
A peripheral wall that rises from the peripheral edge of the bottom wall and extends toward the cell assembly;
A plurality of end fitting recesses into which end portions of the plurality of columnar electrochemical cells are fitted;
A plurality of spacer housings that are provided in the center of the bottoms of the plurality of end fitting recesses and receive buffer spacers disposed in a compressed state between the bottoms of the plurality of end fitting recesses and the bus bar Recess for use,
Two or more terminals that are provided on the peripheral wall portion and communicate with at least one of the two or more end fitting recesses that communicate with each other so as to receive the bus bar, and allow the terminal portion of the bus bar to go outside. A holder having an opening. A cell group in which four columnar electrochemical cells each having a convex electrode at one end and a planar electrode at the other end are arranged side by side so as to be lined side by side; and the four groups of the cell group The convex electrodes and the surfaces of the two adjacent columnar electrochemical cells are arranged on both sides in the direction in which the columnar electrochemical cells extend and connect the four electrochemical cells with a predetermined wiring pattern. One end located in the direction in which the plurality of columnar electrochemical cells extend in a cell assembly composed of a cylindrical electrode, the convex electrode and the convex electrode, or a plurality of bus bars connecting the planar electrode and the planar electrode A holder fitted to
A bottom wall facing the one end of the cell assembly;
A peripheral wall that rises from the peripheral edge of the bottom wall and extends toward the cell assembly;
Four end fitting recesses into which the ends of the four columnar electrochemical cells are fitted;
Four spacer housings that are provided in the center of the bottoms of the four end fitting recesses and that accommodate cushioning spacers arranged in a compressed state between the bottoms of the plurality of end fitting recesses and the bus bar Recess for use,
2 or more which is provided in the peripheral wall portion and communicates with at least one of the two or more end fitting recesses communicating to receive the bus bar and allows the terminal portion of the bus bar to go outside. A holder having an opening.   The said surrounding wall part is comprised by the four side wall part which has the same length dimension, and is orthogonal, respectively, and the attachment hole is each formed in the same diagonal position of the said four side wall part. Holder. Two rows of recesses are formed of two end fitting recesses communicating with each other,
One opening is formed in each of the two portions of the peripheral wall corresponding to the center position of the two recess rows,
The holder according to claim 10, wherein one opening is formed in each of two portions of the peripheral wall portion corresponding to one end of the two recess rows. Two recess rows made of two end fitting recesses communicating with each other are arranged side by side and one end fitting recess included in one of the two recess rows and one end fitting included in the other The joint recess communicates with
One opening is formed in each of the two portions of the peripheral wall corresponding to the center position of the two recess rows,
The holder according to claim 10, wherein one opening is formed in each of two portions of the peripheral wall portion corresponding to one end of the two recess rows. Two recess rows made of two end fitting recesses communicating with each other are arranged, one end fitting recess included in one of the two recess rows and one end fitting included in the other. The joint recess is in communication, and the remaining one end fitting recess included in one of the two recess rows communicates with the remaining one end fitting recess included in the other. ,
The holder according to claim 10, wherein one opening is formed in each of two portions of the peripheral wall portion corresponding to the center position of the two recess rows. The first recess row consisting of the two end fitting recesses communicating and the second recess row consisting of the two end fitting recesses not communicating are arranged,
The holder according to claim 10, wherein one opening is formed in each of the peripheral wall portions surrounding the two end fitting recesses constituting the second recess row.

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