JP2019133740A - Battery module - Google Patents

Abstract

To provide a battery module capable of restraining complex deformation of the battery module, even upon expansion of a battery cell.SOLUTION: A battery module 1 includes an array body 11 of multiple battery cells 10 where positive electrode terminals 15 and negative electrode terminals 17 are arranged alternately in the arrangement direction D1, and multiple bus bars 20 for electrically connecting the multiple battery cells 10 in series, by coupling the positive electrode terminals 15 of one battery cell 10 and the negative electrode terminals 17 adjoining one side in the arrangement direction D1, and coupling the negative electrode terminals 17 of one battery cell 10 and the positive electrode terminals 15 of the battery cell 10 adjoining the other side in the arrangement direction D1. The positive electrode terminals 15 of one battery cell 10 and the negative electrode terminals 17 of the battery cell 10 adjoining the other side in the arrangement direction D1 are coupled via resin bars 30, and the negative electrode terminals 17 of one battery cell 10 and the positive electrode terminals 15 of the battery cell 10 adjoining the one side in the arrangement direction D1 are coupled via the resin bars 30.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a battery module.

  Conventionally, a battery module in which a plurality of battery cells are arranged along a predetermined arrangement direction is known. For example, the battery module disclosed in Patent Document 1 includes a plurality of unit cells including electrode terminals protruding outward, and a connecting member that electrically connects the plurality of unit cells. The connecting member includes a plurality of bus bars, a holder portion that supports the plurality of bus bars, and an insulating guide having a narrow width portion that connects the holder portions.

JP 2011-249303 A

  Generally, in a battery module in which a plurality of battery cells are arranged, the battery cell expands due to repeated charging and discharging, and as a result, the overall shape of the battery module may be deformed. In the battery module, since the rigidity differs between the connection portion and the non-connection portion of the bus bar between the battery cells, it is considered that the battery module undergoes complicated deformation when the battery cell expands. If the battery module is complicatedly deformed, there is a risk of damaging parts such as a holder or reducing heat dissipation due to separation of the heat dissipation member.

  An object of this invention is to provide the battery module which can suppress the complicated deformation | transformation of a battery module, even if expansion | swelling of a battery cell arises.

  A battery module according to one aspect includes an array of a plurality of battery cells arranged such that positive terminals and negative terminals are alternately arranged in the arrangement direction, and a battery adjacent to one side in the arrangement direction of the positive terminal of one battery cell. A plurality of battery cells are electrically connected in series by connecting the negative electrode terminal of the cell and connecting the negative electrode terminal of one battery cell and the positive electrode terminal of the battery cell adjacent to the other side in the arrangement direction. A plurality of bus bars, and a positive electrode terminal of one battery cell and a negative electrode terminal of a battery cell adjacent to the other side in the arrangement direction are connected via an insulating member, and the negative electrode terminal of one battery cell and the arrangement direction The positive electrode terminal of the battery cell adjacent to one side of the is connected via an insulating member.

  In the battery module, one positive electrode terminal is connected to one adjacent negative electrode terminal via a bus bar, and is connected to the other adjacent negative electrode terminal via an insulating member. Accordingly, since the battery cells are connected by the insulating member even in the non-connected portion of the bus bar, it is difficult for a difference in rigidity to occur between the connected portion of the bus bar and the non-connected portion of the bus bar. Therefore, even if the battery cell expands, complex deformation of the battery module can be suppressed.

  A battery module according to one aspect includes an array of a plurality of battery cells arranged such that positive terminals and negative terminals are alternately arranged in the arrangement direction, and a battery adjacent to one side in the arrangement direction of the positive terminal of one battery cell. A plurality of battery cells are electrically connected in series by connecting the negative electrode terminal of the cell and connecting the negative electrode terminal of one battery cell and the positive electrode terminal of the battery cell adjacent to the other side in the arrangement direction. A plurality of bus bars, and brackets provided at both ends of the array of the array body, and one side in a direction connecting the positive electrode terminal and the negative electrode terminal in the same battery cell is a fixed portion to the external support body, In the electrode terminal row located on the opposite side, the positive electrode terminal and the negative electrode terminal of the battery cell adjacent on the other side in the arrangement direction are connected via an insulating member.

  In the battery module described above, the bracket fixed to the support has high rigidity on the fixed portion side. Therefore, deformation is unlikely to occur in the electrode terminal row on one side close to the fixed portion side of the bracket. On the other hand, an insulating member is provided on the electrode terminal row on the other side located on the side opposite to the fixed portion. Thereby, in the other electrode terminal row | line | column, since the positive electrode terminal and negative electrode terminal are connected by an insulating member also in the non-connecting part of a bus bar, it becomes difficult to produce a difference in the rigidity between each terminal. Thereby, in any one of the electrode terminal row on the one side and the electrode terminal row on the other side, deformation of the unconnected portion of the bus bar is suppressed. Therefore, even if the battery cell expands, complex deformation of the battery module can be suppressed.

  A battery module according to one aspect includes an array of a plurality of battery cells arranged such that positive terminals and negative terminals are alternately arranged in the arrangement direction, and a battery adjacent to one side in the arrangement direction of the positive terminal of one battery cell. A plurality of battery cells are electrically connected in series by connecting the negative electrode terminal of the cell and connecting the negative electrode terminal of one battery cell and the positive electrode terminal of the battery cell adjacent to the other side in the arrangement direction. A plurality of bus bars, and between different battery cells, at least a pair of a positive electrode terminal constituting one electrode terminal row and a negative electrode terminal constituting the other electrode terminal row is connected via an insulating member Yes.

  In the battery module, the positive electrode terminal of one electrode terminal row and the negative electrode terminal of the other electrode terminal row that are not connected by the bus bar are connected by the insulating member. Thereby, since it can connect between battery cells with an insulating member also in the non-connecting part of a bus bar, it becomes difficult to produce a difference in the rigidity between each terminal. Therefore, even if the battery cell expands, complex deformation of the battery module can be suppressed.

  Moreover, in the battery module of one form, the insulating member may be disposed on the front end side of the positive electrode terminal or the negative electrode terminal with respect to the positive electrode terminal or the negative electrode terminal rather than the bus bar. According to this structure, a positive electrode terminal or a negative electrode terminal, and a bus bar can be made to contact better.

  In one embodiment of the battery module, the bus bar has a pair of flat portions connected to the positive electrode terminal and the negative electrode terminal, and a protruding portion protruding to one surface side of the flat portion, and the protruding portion is separated from the battery cell. You may arrange | position so that it may protrude in the direction. According to this configuration, the bus bars are easily deformed in the arrangement direction. In this case, even if an insulating member having rigidity equivalent to that of the bus bar is made of a material having a low elastic modulus, the thickness of the insulating member can be reduced.

  In one form of the battery module, the insulating member may be formed of a resin material. In this case, the insulating member may contain reinforcing fibers. According to this configuration, an insulating member having equivalent rigidity can be obtained even with a smaller thickness or a smaller cross-sectional area.

  Moreover, in the battery module of one form, in the electrode terminal row located on the fixed part side, the positive electrode terminal and the negative electrode terminal of the battery cell adjacent to the other side in the arrangement direction may be disconnected. With such a configuration, the number of parts on the fixed part side can be reduced. Since the bracket fixed to the support body has high rigidity on the fixed portion side, the electrode terminal row on the fixed portion side is not easily deformed even at a non-connected portion of the bus bar.

  According to one aspect of the battery module, even when the battery cell expands, complex deformation of the battery module can be suppressed.

It is a schematic plan view of the battery module which concerns on one Embodiment. It is sectional drawing along the II-II line of the battery module of FIG. It is a schematic plan view which shows the battery module in a comparative example. It is a schematic plan view which shows the battery module in another comparative example. It is a schematic plan view explaining the effect | action of the battery module in embodiment. It is a schematic plan view of the battery module which concerns on other embodiment. It is a schematic plan view of the battery module which concerns on other embodiment. It is a schematic plan view of the battery module which concerns on other embodiment.

  Embodiments according to the present invention will be specifically described below with reference to the drawings. For convenience, the same reference numerals are given to substantially the same elements, and the description thereof may be omitted.

  FIG. 1 is a schematic plan view schematically showing a battery module according to one embodiment. FIG. 2 is a cross-sectional view when the battery module is cut along the arrangement direction at the position of the electrode terminals. One form of the battery module 1 is used in a state in which a plurality of battery modules 1 are housed in a housing, for example, like a battery pack.

  As shown in FIGS. 1 and 2, the battery module 1 includes a plurality of battery cells 10, a plurality of bus bars 20, a plurality of resin bars 30, and a pair of brackets 40. In the illustrated example, seven battery cells 10, six bus bars 20, and six resin bars 30 are shown. The battery cell 10 is a battery in which an electrode assembly is accommodated in a substantially rectangular parallelepiped case 13, and is a nonaqueous electrolyte secondary battery such as a lithium ion secondary battery.

  In the present embodiment, the array body 11 is configured by arranging a plurality of battery cells 10 along a predetermined array direction D1. Hereinafter, the direction of the arrow in the arrangement direction D1 shown in the drawing is one side, and the opposite direction is the other side of the arrangement direction D1. A metal heat transfer plate that reduces the temperature difference between the battery cells 10 may be interposed between the adjacent battery cells 10. In the battery cell 10, a positive electrode terminal 15 and a negative electrode terminal 17 are formed on the upper surface 13 a of the case 13. Hereinafter, the positive electrode terminal 15 and the negative electrode terminal 17 may be collectively referred to as “electrode terminal 14”.

  The positive electrode terminal 15 and the negative electrode terminal 17 formed in one battery cell 10 are separated from each other in the width direction D2 intersecting the arrangement direction D1. That is, the direction connecting the positive electrode terminal 15 and the negative electrode terminal 17 in one battery cell 10 is the width direction D <b> 2 of the array 11. Hereinafter, the direction of the arrow in the width direction D2 shown in the drawings is one side, and the opposite direction is the other side of the width direction D2. In adjacent battery cells 10, the arrangement relationship between the positive electrode terminal 15 and the negative electrode terminal 17 in the width direction D <b> 2 is reversed. Thereby, in the array 11, electrode terminal rows 12A and 12B in which the positive terminals 15 and the negative terminals 17 are alternately arranged in the arrangement direction D1 are formed on one side and the other side in the width direction D2, respectively. Yes.

  The electrode terminal 14 includes, for example, a base 14a having a nut shape, a bolt body 14b protruding from the base 14a, and a nut-like fastening portion 14c fastened to the bolt body 14b. The bolt body 14b in the illustrated example protrudes in a direction D3 that intersects the arrangement direction D1 and the width direction D2. In the electrode terminal 14, at least one of the bus bar 20 and the resin bar 30 is fastened by the fastening portion 14c.

  The bus bar 20 electrically connects the battery cells 10 arranged in the arrangement direction D1 in series. That is, the bus bar 20 is connected to the positive terminal 15 of one battery cell 10 and the negative terminal 17 of another battery cell 10 adjacent to one side in the arrangement direction D1. The bus bar 20 is connected to the negative terminal 17 of one battery cell 10 and the positive terminal 15 of another battery cell 10 adjacent to the other side in the arrangement direction D1. Thereby, in each electrode terminal row | line | column 12A, 12B, the positive electrode terminal 15 is connected via the bus bar 20 with the negative electrode terminal 17 adjacent to the one side of the arrangement direction D1, and the negative electrode terminal 17 is the other of the arrangement direction D1. The positive electrode terminal 15 adjacent to the side is connected via the bus bar 20.

  The bus bar 20 is formed of a plate made of a metal material such as copper. In the present embodiment, the bus bar 20 has a pair of flat portions 21 and a protruding portion 23. The pair of flat portions is formed at both ends in the longitudinal direction along the arrangement direction D1. Each flat portion 21 is formed with a through hole 21a through which the bolt body 14b of the electrode terminal 14 is inserted. The protruding portion 23 connects the flat portions 21 to each other, and bends and protrudes on one surface side of the flat portion 21. The bus bar 20 is disposed so that the protruding portion 23 protrudes in a direction away from the upper surface 13 a of the case 13.

  The resin bar 30 has a plate shape, for example. The resin bar 30 has through holes 31a through which the bolt bodies 14b are inserted at both ends in the longitudinal direction along the arrangement direction D1. In the present embodiment, the resin bar 30 is connected to the positive electrode terminal 15 of one battery cell 10 and the negative electrode terminal 17 of another battery cell 10 adjacent to the other side in the arrangement direction D1. The resin bar 30 is connected to the negative terminal 17 of one battery cell 10 and the positive terminal 15 of another battery cell 10 adjacent to one side in the arrangement direction D1. Thereby, in each electrode terminal row | line | column 12A, 12B, the positive electrode terminal 15 is connected via the resin bar 30 with the negative electrode terminal 17 adjacent to the other side of the arrangement direction D1, and the negative electrode terminal 17 is one side of the arrangement direction D1. The positive electrode terminal 15 adjacent to the side is connected via the resin bar 30.

  In the electrode terminal rows 12 </ b> A and 12 </ b> B, the bus bars 20 and the resin bars 30 alternately connect the adjacent electrode terminals 14, and portions connected by the bus bars 20 are not connected by the resin bars 30. Therefore, in the battery cell 10 arranged on the inner side excluding the arrangement end, the bus bar 20 and the resin bar 30 are fastened to the electrode terminal 14, and in the battery cell 10 at the arrangement end, either the bus bar 20 or the resin bar 30 is connected to the electrode terminal 14. Either one is concluded. In the battery cell 10 arranged on the inner side excluding the arrangement end, the bus bar 20 is arranged on the pedestal 14a side, and the resin bar 30 is arranged on the fastening part 14c side. In the illustrated example, the thickness W1 of the resin bar 30 is smaller than the height W2 of the protrusion 23.

  The resin bar 30 is an insulating member having electrical insulating properties, and is formed of an electrically insulating resin material such as polyamide or ABS resin. Further, such a resin material may include reinforcing fibers such as glass fibers and carbon fibers. The resin bar 30 may have a rigidity comparable to that of the bus bar 20. For example, when the elastic modulus of the resin material forming the resin bar 30 is smaller than the elastic modulus of the metal material forming the bus bar 20, the cross-sectional area of the resin bar 30 is made larger than the cross-sectional area of the bus bar 20. The stiffness may be adjusted. For example, when the resin material includes reinforcing fibers and has an elastic modulus close to that of the metal material, the thickness of the resin bar 30 may be smaller than the thickness of the bus bar 20.

  The pair of brackets 40 are respectively provided at both ends of the array body 11 in the array direction D1, and are fixed to an external support body 3 such as a wall portion of the housing. For example, the bracket 40 is formed by bending a plate-like member made of a metal material. The bracket 40 is formed with a sandwiching portion 43 and a fixing portion 45 with the bent portion 41 interposed therebetween. The sandwiching portion 43 is a portion that sandwiches the array body 11. For example, the pair of sandwiching portions 43 can sandwich and press the array body 11 in the array direction D1 with bolts and nuts (not shown). Between the array body 11 and the clamping part 43, the elastic member formed in flat form, for example with rubber | gum etc. may be arrange | positioned.

  The fixing portion 45 is a portion that is fixed to the support 3 with a bolt (not shown), for example. In a state where the array body 11 is sandwiched between the sandwiching portions 43, the fixing portion 45 is located on one side of the array body 11 in the width direction D <b> 2. The bracket 40 is formed with a rib (not shown) for increasing the strength.

  Here, a comparative example of the present embodiment will be described with reference to FIGS. 3 and 4. FIG. 3 is a schematic plan view showing the battery module 80 according to the first comparative example, and schematically shows a state where the battery cell 10 has expanded when the array body 11 is not sandwiched between the brackets 40. The battery module 80 according to the first comparative example includes a plurality of battery cells 10 and a bus bar 20 that electrically connects the battery cells 10 in series, similarly to the battery module 1 of the present embodiment.

  Unlike the above embodiment, the battery module 80 does not have the resin bar 30. That is, in each electrode terminal row | line | column 12A, 12B, the positive electrode terminal 15 and the negative electrode terminal 17 of the battery cell 10 adjacent on the other side of the arrangement direction D1 are unconnected. In this case, the rigidity between the electrode terminals 14 that are not connected is lower than that between the electrode terminals 14 that are connected by the bus bar 20, and deformation is likely to occur. Therefore, when the battery cell 10 expands, the non-connected portion of the positive electrode terminal 15 and the negative electrode terminal 17 adjacent to each other is easily expanded in the arrangement direction D1. Thereby, the array body 11 may expand in the array direction D1.

  FIG. 4 is a schematic plan view showing the battery module 90 according to the second comparative example, and schematically shows a state in which the battery cell 10 is expanded when the array body 11 is sandwiched between the brackets 40. Similar to the first comparative example, the battery module 90 does not have the resin bar 30 also in the second comparative example. Therefore, it is the same as in the first comparative example that the deformation is likely to occur at the non-connected portion between the adjacent electrode terminals 14. However, in the second comparative example, the array body 11 is held by the bracket 40. In this case, the bracket 40 is less rigid on the opposite side to the fixed portion 45 than the fixed portion 45 side fixed to the support body 3, and is likely to be bent. Thereby, when the battery cell 10 expands, the electrode terminal row 12 </ b> A arranged on the support 3 side is hardly deformed, and the electrode terminal row 12 </ b> B arranged on the opposite side to the support 3 is easily deformed. . As a result, it is conceivable that the battery cell 10 moves in the width direction D2 so as to protrude to the opposite side of the support 3. Thereby, as shown with a broken line in a figure, the array body 11 may be curved so that it may protrude on the opposite side to the support body 3. FIG.

  In the battery module 1 according to the present embodiment described as described above, one positive electrode terminal 15 is connected to one adjacent negative electrode terminal 17 via the bus bar 20 and to the other adjacent negative electrode terminal 17. The resin bar 30 is connected. Thereby, since the battery cells 10 are connected by the resin bar 30 even in the unconnected portion of the bus bar 20, a difference in rigidity between the electrode terminals 14 is less likely to occur. FIG. 5 schematically shows the battery module 1 in a state where the battery cell 10 is expanded. In FIG. 5, the bracket 40 is omitted. As shown in FIG. 5, in the battery module 1 of the present embodiment, the expansion in the arrangement direction D <b> 1 is about the same between any adjacent electrode terminals 14. Therefore, even if the battery cell 10 expands, complicated deformation of the battery module 1 can be suppressed.

  The resin bar 30 is fastened to the electrode terminal 14 so as to be disposed closer to the tip end side of the electrode terminal 14 than the bus bar 20. According to this configuration, since the bus bar 20 is disposed on the pedestal 14a side, the bus bar 20 can be electrically connected to the bolt body 14b and the pedestal 14a. Thereby, the electrode terminal 14 and the bus-bar 20 can be made to contact favorably.

  Moreover, since the bus bar 20 has the flat part 21 and the protrusion part 23 which bend | folds and protrudes to the one surface side of the flat part 21, it becomes easy to deform | transform into the sequence direction D1. In this case, even if the resin bar 30 having the same rigidity as the bus bar 20 is made of a material having a low elastic modulus, the thickness of the resin bar 30 can be reduced. Further, when the resin bar 30 includes reinforcing fibers, the resin bar 30 having the same rigidity can be obtained with a thinner thickness. By forming the resin bar 30 thin, the entire battery module can be downsized.

  The resin bar 30 may have a plate shape having a cross-sectional area larger than that of the bus bar 20. According to this configuration, it is possible to achieve rigidity equivalent to that of the bus bar 20 using a material having a low elastic modulus.

[Second Embodiment]
In the battery module 101 according to the present embodiment, the configuration of the electrode terminal array 12A arranged on the fixed portion side is different from the battery module 1 of the first embodiment. In the following, differences from the first embodiment will be mainly described, and the same elements and members will be denoted by the same reference numerals and detailed description thereof will be omitted.

  FIG. 6 is a schematic plan view schematically showing the battery module according to the present embodiment. As shown in FIG. 6, the battery module 101 includes seven battery cells 10, six bus bars 20, three resin bars 30, and a pair of brackets 40. The configuration of the battery cell 10, the bus bar 20, and the bracket 40 is the same as that of the battery module 1 of the first embodiment.

  In the electrode terminal row 12B located on the opposite side of the fixed portion 45 in the width direction D2, the positive electrode terminal 15 and the negative electrode terminal 17 adjacent to the other side in the arrangement direction D1 are interposed via the resin bar 30 as in the first embodiment. Are connected. On the other hand, in the electrode terminal row 12A located on the fixed portion 45 side in the width direction D2, the resin bar 30 is not connected between the positive electrode terminal 15 and the negative electrode terminal 17 adjacent to the other side in the arrangement direction D1. It is unconsolidated.

  As described above, in the battery module 101, the resin bar 30 is not provided in the electrode terminal row 12A on one side located on the fixed portion 45 side. However, the bracket 40 in a state of being fixed to the support body 3 has high rigidity on the fixing portion 45 side. Since the electrode terminal row 12 </ b> A on the one side is close to the fixing portion 45 side of the bracket 40, deformation is unlikely to occur even at a non-connected portion of the bus bar 20. On the other hand, the resin bar 30 is provided on the electrode terminal row 12B on the other side located on the side opposite to the fixed portion 45. As a result, in the electrode terminal row 12B on the other side, since the positive electrode terminal 15 and the negative electrode terminal 17 are connected by the resin bar 30 even in the non-connected portion of the bus bar 20, a difference in rigidity between the electrode terminals 14 occurs. It becomes difficult. Therefore, even if the battery cell 10 expands, complex deformation of the battery module 101 can be suppressed.

[Third Embodiment]
The battery module 201 according to the present embodiment is different from the battery module 1 of the first embodiment in that the resin bar 230 is connected across the one electrode terminal row 12A and the other electrode terminal row 12B. In the following, differences from the first embodiment will be mainly described, and the same elements and members will be denoted by the same reference numerals and detailed description thereof will be omitted.

  FIG. 7 is a schematic plan view schematically showing the battery module according to the present embodiment. As shown in FIG. 7, the battery module 201 includes seven battery cells 10, six bus bars 20, three resin bars 230, and a pair of brackets 40. The configuration of the battery cell 10, the bus bar 20, and the bracket 40 is the same as that of the battery module 1 of the first embodiment.

  The resin bar 230 connects the positive electrode terminal 15 constituting one electrode terminal row 12A and the negative electrode terminal 17 constituting the other electrode terminal row 12B between different battery cells 10. In this embodiment, the three resin bars 230 form three positive terminals 15 constituting the electrode terminal row 12A on the fixed portion 45 side, and three negative terminals constituting the electrode terminal row 12B on the opposite side to the fixed portion 45. 17 is connected. Another battery cell 10 is disposed between the pair of battery cells 10 provided with the electrode terminals 14 connected by the resin bar 230. In the illustrated example, another battery cell 10 is disposed between the pair of battery cells 10 connected by the resin bar 230. Further, in the pair of the positive electrode terminal 15 and the negative electrode terminal 17 connected by the resin bar 230, the negative electrode terminal 17 is disposed on the other side in the arrangement direction D <b> 1 with respect to the positive electrode terminal 15.

  In the battery module 201 described above, the positive electrode terminal 15 of one electrode terminal row 12A and the negative electrode terminal 17 of the other electrode terminal row 12B that are not connected by the bus bar 20 are connected by the resin bar 230. Thereby, since the battery cells 10 can be connected by the resin bar 230, a difference in rigidity between the electrode terminals 14 hardly occurs. Therefore, even if the battery cell 10 expands, complicated deformation of the battery module 201 can be suppressed. In the present embodiment, the other battery cell 10 is disposed between the pair of battery cells 10 connected by the resin bar 230, so the number of the resin bars 230 is the number of the resin bars 30 of the first embodiment. It is half of. Therefore, the rigidity of the resin bar 230 may be larger than that of the resin bar 30.

[Fourth Embodiment]
The battery module 301 according to the present embodiment is different from the battery module 1 of the first embodiment in that the resin bar 330 is connected across the one electrode terminal row 12A and the other electrode terminal row 12B. In the following, differences from the first embodiment will be mainly described, and the same elements and members will be denoted by the same reference numerals and detailed description thereof will be omitted.

  FIG. 8 is a schematic plan view schematically showing the battery module according to the present embodiment. As shown in FIG. 8, the battery module 301 includes seven battery cells 10, six bus bars 20, one resin bar 330, and a pair of brackets 40. The configuration of the battery cell 10, the bus bar 20, and the bracket 40 is the same as that of the battery module 1 of the first embodiment.

  The resin bar 330 connects the positive electrode terminal 15 constituting one electrode terminal row 12 </ b> A and the negative electrode terminal 17 constituting the other electrode terminal row 12 </ b> B between different battery cells 10. In the present embodiment, the single positive electrode terminal 15 in the arrangement direction D1 constituting the electrode terminal row 12A on the fixed portion 45 side and the electrode terminal row 12B on the opposite side to the fixed portion 45 are formed by one resin bar 330. A negative electrode terminal 17 on the other side in the arrangement direction D1 is connected. Further, the pair of positive electrode terminal 15 and negative electrode terminal 17 connected by the resin bar 330 is not connected to the other electrode terminal 14 by the bus bar 20.

  In the battery module 301 described above, the positive electrode terminal 15 of one electrode terminal row 12A and the negative electrode terminal 17 of the other electrode terminal row 12B that are not connected by the bus bar 20 are connected by the resin bar 330. Thereby, since the battery cells 10 can be connected by the resin bar 330 even in the non-connected portion of the bus bar 20, a difference in rigidity between the electrode terminals 14 hardly occurs. Therefore, even if the battery cell 10 expands, complex deformation of the battery module 301 can be suppressed. In the present embodiment, the positive electrode terminal 15 and the negative electrode terminal 17 arranged at both ends in the arrangement direction D1 are connected by one resin bar 330. Therefore, the rigidity of the resin bar 330 may be larger than that of the resin bar 230.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, a specific structure is not restricted to this embodiment.

  For example, although the bus bar which has a flat part and a protrusion part was illustrated, it is not limited to this. For example, you may use the plate-shaped bus bar formed only by the flat part, without having a protrusion part. Thus, the bus bar that does not have the protruding portion is more rigid than the bus bar that has the protruding portion.

  Moreover, although the example in which the positive electrode terminal and the negative electrode terminal are directly connected by the resin bar is shown, the present invention is not limited to this. For example, one bus bar connected to the positive electrode terminal and the other bus bar connected to the negative electrode may be connected by a resin bar.

  Moreover, although the resin bar formed with the resin material was illustrated as an insulating member, it is not limited to this. Even if the insulating member is not entirely formed of an insulating material, the insulating member only needs to have a structure that can insulate the electrode terminals from each other by using an insulating material in a part, for example, when a metal material is covered with an insulating material. .

[Example]
Hereinafter, although the said embodiment is further demonstrated with reference to an Example, the material, dimension, etc. of a bus bar and a resin bar are examples, for example, Each said embodiment is not limited to the content of an Example.

As Example 1, the rigidity of the bus bar formed of copper and the rigidity of the resin bar formed of PA66-GF30 (polyamide 66 resin containing 30% glass fiber) were compared. A bus bar prepared by processing a plate member having a thickness of 0.8 mm, a width of 20 mm, a length of 30 mm, and a cross-sectional area of 16 mm ^{2 so} as to have a flat portion and a protruding portion in the same manner as the bus bar of the above embodiment was prepared. As a resin bar, a plate member having a thickness of 0.125 mm, a width of 20 mm, a length of 30 mm, and a cross-sectional area of 2.5 mm ² was prepared. In both the bus bar and the resin bar, the amount of elongation when a load of 100 N was applied in the length direction was 0.6 mm, which had equivalent rigidity.

As Example 2, the rigidity of the bus bar formed of copper and the rigidity of the resin bar formed of CFRP were compared. A plate member having a thickness of 1 mm, a width of 20 mm, a cross-sectional area of 20 mm ² , and an elastic modulus of 110 GPa was prepared as a bus bar. A plate member having a thickness of 1.1 mm, a width of 20 mm, a cross-sectional area of 22 mm ² , and an elastic modulus of 100 GPa was prepared as a resin bar. When both the bus bar and the resin bar have a plate shape having no protrusions, if the product of the elastic modulus and the cross-sectional area are equal, the amount of elongation when the same load is applied becomes equal. In Example 2, the product of the elastic modulus and the cross-sectional area was 2200 GPa · mm ² in any of the bus bar and the resin bar, and had equivalent rigidity.

DESCRIPTION OF SYMBOLS 1 ... Battery module, 10 ... Battery cell, 11 ... Array, 12A, 12B ... Electrode terminal row | line | column, 15 ... Positive electrode terminal, 17 ... Negative electrode terminal, 20 ... Busbar, 21 ... Flat part, 23 ... Projection part, 30 ... Resin Bar (insulating member), D1... Array direction.

Claims (8)

An array of a plurality of battery cells arranged such that positive and negative terminals are alternately arranged in the arrangement direction;
Connecting a positive electrode terminal of one battery cell and a negative electrode terminal of a battery cell adjacent to one side in the arrangement direction, and a battery cell adjacent to the negative electrode terminal of the one battery cell and the other side in the arrangement direction. A plurality of bus bars that electrically connect the plurality of battery cells in series by connecting the positive electrode terminal; and
The positive electrode terminal of the one battery cell and the negative electrode terminal of the battery cell adjacent to the other side of the arrangement direction are connected via an insulating member,
The battery module, wherein the negative electrode terminal of the one battery cell and the positive electrode terminal of the battery cell adjacent to one side in the arrangement direction are connected via an insulating member. An array of a plurality of battery cells arranged such that positive and negative terminals are alternately arranged in the arrangement direction;
Connecting a positive electrode terminal of one battery cell and a negative electrode terminal of a battery cell adjacent to one side in the arrangement direction, and a battery cell adjacent to the negative electrode terminal of the one battery cell and the other side in the arrangement direction. A plurality of bus bars that electrically connect the plurality of battery cells in series by coupling the positive electrode terminal;
A bracket that is provided at both ends of the array of the array body, and one side in a direction connecting the positive electrode terminal and the negative electrode terminal in the same battery cell serves as a fixing portion to an external support;
In the electrode terminal row located on the side opposite to the fixed portion, the battery module, wherein the positive terminal and the negative terminal of the battery cell adjacent to the other side in the arrangement direction are connected via an insulating member. An array of a plurality of battery cells arranged such that positive and negative terminals are alternately arranged in the arrangement direction;
Connecting a positive electrode terminal of one battery cell and a negative electrode terminal of a battery cell adjacent to one side in the arrangement direction, and a battery cell adjacent to the negative electrode terminal of the one battery cell and the other side in the arrangement direction. A plurality of bus bars that electrically connect the plurality of battery cells in series by connecting the positive electrode terminal; and
A battery module in which at least a pair of the positive electrode terminal constituting one electrode terminal row and the negative electrode terminal constituting the other electrode terminal row is connected via an insulating member between different battery cells.   The battery module according to any one of claims 1 to 3, wherein the insulating member is disposed closer to a front end side of the positive electrode terminal or the negative electrode terminal than the bus bar with respect to the positive electrode terminal or the negative electrode terminal. The bus bar
A pair of flat portions connected to the positive terminal and the negative terminal;
A protruding portion protruding on one side of the flat portion,
The battery module as described in any one of Claims 1-4 arrange | positioned so that the said protrusion part may protrude in the direction away from the said battery cell.   The battery module according to claim 1, wherein the insulating member is made of a resin material.   The battery module according to claim 6, wherein the insulating member includes a reinforcing fiber.   The battery module according to claim 2, wherein in the electrode terminal row located on the fixed part side, the positive electrode terminal and the negative electrode terminal of the battery cell adjacent to the other side in the arrangement direction are not connected.

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