JP6464786B2 - Battery module - Google Patents

Description

  The present invention relates to a battery module.

  As a battery module, there exists a thing described in patent document 1, for example. The battery module of Patent Document 1 includes an array body in which a plurality of battery cells are arrayed, a pair of end plates that sandwich the array body from both sides, and a pair of pressing plates (between the array body and each end plate). Middle plate) and a connecting member (tie rod) that is inserted through the insertion hole of the middle plate and connects the pair of end plates. A compression spring is disposed between the end plate and the middle plate, and the middle plate presses the array body by the urging force of the compression spring.

JP 2003-36830 A

  In a battery module including such a middle plate, the middle plate is often formed of a resin as an insulating material in order to ensure insulation between the battery cell and the end plate. However, the middle plate made of resin is vulnerable to vibration and / or impact, and may be damaged, making it impossible to ensure insulation between the battery cell and the end plate.

  Therefore, an object of the present invention is to provide a battery module having excellent durability while ensuring insulation between the battery cell and the end plate.

  The battery module of the present invention includes an array body in which a plurality of battery cells are arrayed, an elastic member disposed on at least one side in the array direction of the array body, a pair of end plates that sandwich the array body and the elastic member, A coupling member that couples the pair of end plates; and a middle plate that is disposed between the array and the elastic member. The middle plate includes a reinforcing portion made of a metal material and an insulating portion made of an insulating material. The reinforcing portion and the insulating portion are in contact with each other.

  In the battery module having this configuration, since the reinforcing portion made of a metal material is disposed as a part of the middle plate, the strength of the whole middle plate is improved. In addition, since an insulating portion made of an insulating material is disposed as a part of the middle plate between the array body and the end plate, insulation between the array body in which a plurality of battery cells are arrayed and the end plate is secured. can do. As a result, it is possible to provide a battery module with excellent durability while ensuring insulation between the battery cell and the end plate.

  In the battery module of the present invention, the reinforcing portion may be disposed on the elastic member side, and the insulating portion may be disposed on the array body side.

  In the battery module having this configuration, there is no need to positively provide an insulating configuration between the insertion hole and the insertion hole through which the connecting member is inserted in the reinforcing portion.

  In the battery module of the present invention, the connecting member is inserted into the first insertion hole formed in the reinforcing portion and the second insertion hole formed in the insulating portion, and the inner diameter of the first insertion hole is the second insertion hole. It may be smaller than the inner diameter.

  In the middle plate, the portion of the insertion hole through which the connecting member is inserted contacts the connecting member is particularly susceptible to damage. In the battery module having this configuration, the connecting member inserted through the first insertion hole and the second insertion hole comes into contact only with the reinforcing portion where the first insertion hole having a small inner diameter is formed. Thereby, generation | occurrence | production of damage can be suppressed compared with a connection member contacting the 2nd penetration hole of an insulation part.

  In the battery module of the present invention, the reinforcing portion is formed with a cylindrical portion that protrudes toward the insulating portion and the inner space portion communicates with the first insertion hole, and the cylindrical portion is formed in the second insertion hole. It may be interpolated.

  In the battery module having this configuration, since the cylindrical portion protruding from the reinforcing portion toward the insulating portion is inserted into the insertion hole of the insulating portion, the movement of the insulating portion with respect to the reinforcing portion is restricted. Thereby, since it can prevent that an insulation part shift | deviates from a predetermined position, generation | occurrence | production of the short circuit by an array body and a reinforcement part contacting can be suppressed.

  In the battery module of the present invention, an insulating member may be disposed between the inner peripheral surface of the first insertion hole and the outer peripheral surface of the connecting member.

  In the battery module having this configuration, the array body and the reinforcing portion can be prevented from being short-circuited via the connecting member.

  In the battery module of the present invention, the opposing surfaces of the insulating portion and the reinforcing portion are formed with uneven portions that are uneven in the opposite directions, and the insulating portion and the reinforcing portion are fitted together by the uneven portions. May be.

  In the battery module having this configuration, the movement of the insulating portion with respect to the reinforcing portion is restrained, so that the position of the insulating portion is prevented from shifting relative to the reinforcing portion. Thereby, it can suppress that a short circuit arises when an array body and a reinforcement part contact. In addition, a mutual uneven | corrugated | grooved part may be fitted in the state with mutual play, and may be fitted in the state without mutual play.

  In the battery module of the present invention, the convex portion among the concave and convex portions may be formed on the reinforcing portion.

  In the battery module having this configuration, the convex portion that is more easily damaged than the concave portion can be formed of a metal material having relatively high strength compared to the insulating material. Thereby, the damage of a convex part can be suppressed.

  In the battery module of the present invention, when the area of the surface perpendicular to the extending direction of the connecting member in the reinforcing portion is the first area and the area of the surface perpendicular to the extending direction of the connecting member in the insulating portion is the second area The second area may be larger than the first area.

  In the battery module having this configuration, even if the reinforcing portion is slightly displaced from the insulating portion, the reinforcing portion and the array body do not contact each other. Thereby, generation | occurrence | production of the short circuit by an array body and a reinforcement part contacting can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, the battery module excellent in durability can be provided, ensuring the insulation between a battery cell and an end plate.

It is a top view which shows a battery module. It is the perspective view which shows the battery cell hold | maintained at the cell holder, and the perspective view which shows a cell holder. It is the front view which looked at the reinforcement part of the middle plate from the elastic member side, and the front view which looked from the array body side. They are the front view which looked at the insulation part of the middle plate from the elastic member side, and the front view which looked from the array body side. It is sectional drawing which expanded and showed a part of middle plate in the assembly | attachment state. It is the front view which looked at the middle plate concerning a modification from the elastic member side. It is sectional drawing which looked at the middle plate which concerns on a modification from the side surface side.

  Hereinafter, a battery module 1 according to an embodiment will be described with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. The dimensional ratios in the drawings do not necessarily match those described. In the description, terms indicating directions such as “up” and “down” are convenient terms based on the state shown in the drawings.

  FIG. 1 is a plan view showing a battery module. Fig.2 (a) is a perspective view which shows the battery cell hold | maintained at the cell holder, FIG.2 (b) is a perspective view which shows a cell holder.

  As shown in FIG. 1, the battery module 1 includes an array 15 in which a plurality of battery cells 11 are held by a cell holder 21, and an array direction D (the left-right direction in FIG. 1) of the array 15. An elastic member 31 disposed on one side (the right side in FIG. 1), a pair of brackets (end plates) 41 disposed on both sides of the array body 15 and the elastic member 31 in the array direction D, and a pair of brackets 41 A plurality of bolts 51 (connecting members) that connect each other, and a middle plate 61 disposed between the array 15 and the elastic member 31 are provided.

  The battery cell 11 is a battery in which an electrode assembly is accommodated in a rectangular box-like case, and is a nonaqueous electrolyte secondary battery such as a lithium ion secondary battery. In this example, seven battery cells 11 are arranged. The battery cells 11 are arranged in a state of being held by the cell holder 21. Adjacent battery cells 11 are in close contact via a heat transfer plate (not shown). The electrode terminals 13 of the adjacent battery cells 11 are electrically connected to each other by a bus bar 14, whereby the adjacent battery cells 11 are electrically connected in series. The battery cell 11, the cell holder 21, the heat transfer plate, and the bus bar 14 constitute an array 15.

  The cell holder 21 is made of resin. As shown in FIG. 2, the cell holder 21 has a frame body part 22 and a partition part 23. The frame 22 includes a bottom plate 24 and a pair of side plates 25 that stand from both ends of the bottom plate 24. Each of both ends of the bottom plate 24 is provided with a protruding portion 24a protruding in the thickness direction of the bottom plate 24, and each of the protruding portions 24a is provided with an insertion hole 24b penetrating in the arrangement direction D. Bolts 51 (see FIG. 1) are inserted through the insertion holes 24b.

  The partition part 23 connects the pair of side plates 25 to each other. A pair of terminal accommodating portions 26 are provided on the partition portion 23. The terminal accommodating portion 26 has a circular inner wall that surrounds the electrode terminal 13. Furthermore, a pair of square pillars 27 connected to the terminal accommodating part 26 are provided on the partition part 23. The pair of column portions 27 are provided with insertion holes 27 a penetrating in the arrangement direction D. The diameter of the insertion hole 27a is, for example, the same as the diameter of the insertion hole 24b. Bolts 51 (see FIG. 1) are inserted through the insertion holes 27a.

  In the cell holder 21, a housing space S is formed by the frame body portion 22 and the partition portion 23. As shown in FIG. 2A, the battery cell 11 is held in the cell holder 21 by accommodating the battery cell 11 in the accommodation space S. In the cell holder 21, a rectangular opening 28 is formed by the frame body portion 22 and the lower end surface of the partition portion 23 in FIG. The opening 28 is provided for the arrangement of a heat transfer plate (not shown).

  The elastic member 31 is formed in a flat plate shape by rubber, for example. As shown in FIG. 1, the elastic member 31 is disposed between the middle plate 61 and the bracket 41. As shown by a broken line in FIG. 3, the planar shape viewed from the arrangement direction D of the elastic members 31 is, for example, a rectangular shape (rectangular shape), and is smaller than the outer shape of the middle plate 61. The elastic member 31 is assembled to the middle plate 61 by, for example, engaging means (not shown), and is thereby positioned with respect to the array body 15 in a direction orthogonal to the array direction D.

  The pair of brackets 41 sandwich the array body 15 and the elastic member 31 from both sides in the array direction D, apply a restraining load to the array body 15 and the elastic member 31, and attach to the wall 3 of the battery pack housing. On the other hand, the battery module 1 is fixed.

  The bracket 41 is formed by bending a plate-like member made of a metal material. The bracket 41 is formed with a sandwiching portion 42 and a fixing portion 43 with the bent portion 41a interposed therebetween. The sandwiching portion 42 is a portion that sandwiches the array body 15 via the elastic member 31 and the middle plate 61. The fixing portion 43 is a portion fixed to the wall portion 3 of the casing, and is fixed to the wall portion 3 of the casing by, for example, a bolt 51. The bracket 41 is formed with ribs 44 for increasing the strength. The bracket 41 is provided with a plurality of (four in this example) insertion holes 42 a for inserting the bolts 51.

  The bolt 51 is made of, for example, an iron-based metal having a relatively high strength. A plurality of bolts 51 (four in this example) are provided, and extend in the arrangement direction D to connect the pair of brackets 41 to each other. Each of the plurality of bolts 51 is inserted into the insertion holes 42 a of the pair of brackets 41 and is inserted into the insertion holes 24 b or the insertion holes 27 a of the cell holder 21. And it is fastened by a nut (connecting member) 53 outside one bracket 41. By this fastening, a restraining load is applied to the array body 15 and the elastic member 31. The bolt 51 is also inserted into each of a first insertion hole 63c and a second insertion hole 65c (see FIGS. 3A and 4A) of the middle plate 61 described later.

  As shown in FIG. 1, the middle plate 61 is interposed between the array 15 and the elastic member 31. Thereby, the dispersion | variation in the load applied to the array body 15 from the elastic member 31 is suppressed. The middle plate 61 includes a reinforcing portion 63 formed in a flat plate shape with a metal material (for example, iron (steel) or aluminum) and an insulating material (for example, polypropylene (PP) resin, polyethylene (PE) resin, or PA66 resin). And an insulating portion 65 formed in a flat plate shape by a resin. The reinforcing part 63 and the insulating part 65 are in contact with each other. The reinforcing portion 63 is disposed on the elastic member 31 side, and the insulating portion 65 is disposed on the array body 15 side.

  Next, the middle plate 61 will be described in more detail with reference to FIGS. 3 (a), 3 (b), 4 (a), and 4 (b). 3A is a front view of the reinforcing portion 63 of the middle plate 61 viewed from the elastic member 31 side, and FIG. 3B is a front view of the reinforcing portion 63 of the middle plate 61 viewed from the array 15 side. FIG. 4A is a front view of the insulating portion 65 of the middle plate 61 as viewed from the elastic member 31 side, and FIG. 4B is a front view of the insulating portion 65 of the middle plate as viewed from the array 15 side. It is.

  The planar shapes of the reinforcing portion 63 and the insulating portion 65 viewed from the arrangement direction D are rectangular as shown in FIGS. 3A and 4A, respectively. It has the same size and shape.

  As shown in FIG. 3A, the reinforcing portion 63 is provided with four first insertion holes 63 c for inserting the bolts 51. The four first insertion holes 63c are arranged symmetrically. More specifically, the first insertion holes 63c are provided outside the region serving as a contact surface with the elastic member 31, and two first insertion holes 63c are arranged on each of the upper side and the lower side in FIG. . The two lower first insertion holes 63 c are arranged in the left and right corners on the lower side of the reinforcing portion 63. The two upper first insertion holes 63c are arranged above the reinforcing portion 63 with a space narrower than the left and right spaces between the two lower first insertion holes 63c.

  The reinforcing portion 63 has a first surface 63 a that contacts the elastic member 31 and a second surface 63 b that faces the insulating portion 65. As shown in FIG. 3B, a first tubular portion 64 that protrudes toward the insulating portion 65 is formed on the second surface 63 b of the reinforcing portion 63. The inner space 64a of the first cylindrical portion 64 communicates with the first insertion hole 63c. In addition, the second surface 63b of the reinforcing portion 63 is formed with a convex portion 71 that protrudes toward the insulating portion 65 side. When the battery module 1 is assembled, the convex portion 71 is fitted into a concave portion 73 formed on the first surface 65a of the insulating portion 65 described in detail later.

  As shown in FIG. 4A, the insulating portion 65 is provided with four second insertion holes 65 c for inserting the bolts 51. The inner diameter D2 of the second insertion hole 65c is larger than the inner diameter D1 of the first insertion hole 63c. The four second insertion holes 65c are arranged symmetrically. More specifically, the second insertion holes 65c are provided so as to correspond to the positions of the first insertion holes 63c when the reinforcing portions 63 are overlapped, and are respectively provided on the upper side and the lower side in FIG. Two are arranged. The lower two second insertion holes 65c are arranged in the left and right corners on the lower side of the insulating portion 65, respectively. The upper two second insertion holes 65c are arranged on the upper side of the insulating portion 65 with an interval narrower than the left and right intervals of the lower two second insertion holes 65c.

  The insulating portion 65 has a first surface 65 a that faces the reinforcing portion 63, and a second surface 65 b that contacts the array body 15. As shown in FIG. 4B, the second surface 65b of the insulating portion 65 is formed with a second cylindrical portion 66 that protrudes toward the array body 15 side. The inner space 66a of the second tubular portion 66 communicates with the second insertion hole 65c. Further, the first surface 65a of the insulating portion 65 is formed with a recess 73 that is recessed toward the reinforcing portion 63 side. At the time of assembling the battery module 1, the concave portion 73 is fitted into the convex portion 71 formed on the second surface 63 b of the reinforcing portion 63 described above.

  The assembly of the battery module 1 will be described with reference to FIG. As shown in FIG. 5, when the battery module 1 is assembled, the first insertion hole 63 c of the reinforcing portion 63, the inner space 64 a of the first tubular portion 64 of the reinforcing portion 63, and the second insertion hole 65 c of the insulating portion 65. The bolt 51 is inserted into the second cylindrical portion 66 of the insulating portion 65. Here, the first cylindrical portion 64 of the reinforcing portion 63 is inserted into the second insertion hole 65 c of the insulating portion 65 together with the bolt 51. Further, the convex portion 71 of the reinforcing portion 63 is fitted into the concave portion 73 of the insulating portion 65. That is, when the battery module 1 is assembled, the first cylindrical portion 64 of the reinforcing portion 63 is inserted into the second insertion hole 65 c of the insulating portion 65, and the concave portion 73 of the insulating portion 65 has the reinforcing portion 63. By positioning the convex portion 71, the reinforcing portion 63 and the insulating portion 65 are positioned. Thereafter, the bolt 51 is inserted into both the reinforcing portion 63 and the insulating portion 65. At this time, the insulating member 67 is disposed between the inner peripheral surface of the first insertion hole 63 c and the outer peripheral surface of the bolt 51.

  At the same time, the bolt 51 is inserted into the insertion hole 24 b of the cell holder 21. Here, the second tubular portion 66 is inserted into the insertion hole 24 b of the cell holder 21 together with the bolt 51. That is, when the battery module 1 is assembled, the second cylindrical portion 66 of the insulating portion 65 is inserted into the insertion hole 24 b of the cell holder 21, thereby positioning the insulating portion 65 of the middle plate 61 and the cell holder 21. Thereafter, the bolt 51 is inserted into both the inner space 66a and the insertion hole 24b of the second cylindrical portion 66. Similarly, the second cylindrical portion 66 of the insulating portion 65 is inserted into the insertion hole 27 a of the cell holder 21 together with the bolt 51.

  Then, the effect of the battery module 1 demonstrated above is demonstrated. As shown in FIG. 1, in the battery module 1 of the above embodiment, the reinforcing portion 63 made of a metal material is disposed as a part of the middle plate 61, so that the strength of the whole middle plate 61 is improved. In addition, since an insulating portion 65 made of an insulating material is disposed as a part of the middle plate 61 between the array 15 and the bracket 41, the array 15 and the bracket 41 in which a plurality of battery cells 11 are arrayed are arranged. It is possible to ensure insulation between the two. As a result, it is possible to provide the battery module 1 having excellent durability while ensuring insulation between the array body 15 including the plurality of battery cells 11 and the bracket 41.

  Further, in the battery module 1, since the inner diameter D1 of the first insertion hole 63c is smaller than the inner diameter D2 of the second insertion hole 65c, the bolt inserted into the first insertion hole 63c and the second insertion hole 65c. 51 contacts only the reinforcement part 63 in which the 1st insertion hole 63c with a small internal diameter is formed. Thereby, generation | occurrence | production of the damage in the 1st penetration hole 63c and the 2nd penetration hole 65c which the volt | bolt 51 is penetrated can be suppressed.

  Further, in the battery module 1, the first tubular portion 64 that protrudes from the reinforcing portion 63 toward the insulating portion 65 is inserted into the second insertion hole 65 c of the insulating portion 65, so that the insulating portion 65 with respect to the reinforcing portion 63 is inserted. Movement is restrained. Thereby, it is suppressed that the insulation part 65 shifts | deviates from a predetermined position. As a result, it is possible to suppress the occurrence of a short circuit due to the contact between the array body 15 and the reinforcing portion 63.

  Further, in the battery module 1, the reinforcing portion is formed by the concave portions 73 and the convex portions 71 formed on the opposing surfaces of the reinforcing portion 63 and the insulating portion 65 (the second surface 63 b of the reinforcing portion 63 and the first surface 65 a of the insulating portion). 63 and the insulating part 65 are fitted together. Thereby, since the movement of the insulating part 65 with respect to the reinforcing part 63 is restrained, the position of the insulating part 65 with respect to the reinforcing part 63 is suppressed. As a result, it is possible to suppress the occurrence of a short circuit due to the contact between the array body 15 and the reinforcing portion 63.

  In the battery module 1, the convex portion 71 of the concave portion 73 and the convex portion 71 is formed in the reinforcing portion 63 made of a metal material having relatively higher strength than the insulating material. Thereby, damage to the convex part 71 can be suppressed.

  In the battery module 1, since the insulating member 67 is disposed between the inner peripheral surface of the first insertion hole 63 c and the outer peripheral surface of the bolt 51, the array body 15 and the reinforcing portion 63 are interposed via the bolt 51. Can be prevented from being short-circuited.

  Although one embodiment has been described above, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention.

  In the above embodiment, the planar shapes of the reinforcing portion 63 and the insulating portion 65 viewed from the arrangement direction D have been described by taking the example of the same dimensional shape, but the present invention is not limited to this. For example, as illustrated in FIG. 6, the area (first area) of the surface 163a of the reinforcing portion 163 viewed from the arrangement direction D is the area (second area) of the surface 165a of the insulating section 165 viewed from the arrangement direction D. The planar shapes of the reinforcing portion 63 and the insulating portion 65 as viewed from the arrangement direction D may be formed so as to be narrower. With the middle plate 161 having this configuration, even if the reinforcing portion 163 is slightly deviated from the insulating portion 165, the reinforcing portion 163 and the array 15 do not contact each other. Thereby, generation | occurrence | production of the short circuit by the array body 15 and the reinforcement part 163 contacting can be suppressed.

  Further, as shown in FIG. 6, when the area of the surface 163a of the reinforcing portion 163 viewed from the arrangement direction D is smaller than the area of the surface 165a of the insulating portion 165, the insulating portion 165 is formed by the following method. On the other hand, the reinforcing portion 163 may be fixed. That is, a pair of L-shaped protrusions 171 may be provided in the vicinity of the corners located diagonally in the insulating part 165, and the reinforcing part 163 may be fitted into the protrusions 171. Even in this case, the reinforcing portion 163 is restrained from moving in the vertical and horizontal directions with respect to the insulating portion 165. Therefore, the occurrence of a short circuit due to the contact between the array body 15 and the reinforcing portion 163 can be suppressed. Note that the protrusions 171 may be provided at all corners of the insulating portion 165.

  In the above embodiment, as shown in FIG. 5, the example in which the rectangular concave portion 73 and the convex portion 71 are provided in a plan view when viewed from the extending direction of the bolt 51 has been described. If there is, it does not ask the shape. Further, the example in which the convex portion 71 is formed in the reinforcing portion 63 and the concave portion 73 is formed in the insulating portion 65 has been described. And at least one of the convex part may be formed.

  In the above embodiment, as illustrated in FIG. 1, the middle plate 61 in which the reinforcing portion 63 and the insulating portion 65 are arranged to be fitted to each other has been described as an example. However, the reinforcing portion 63 and the insulating portion 65 May be an integrally formed middle plate.

  In the above embodiment, as shown in FIG. 1, in the middle plate 61, the reinforcing portion 63 is disposed on the elastic member 31 side and the insulating portion 65 is disposed on the array body 15 side. The insulating portion 65 may be disposed on the elastic member 31 side, and the reinforcing portion 63 may be disposed on the array body 15 side. Even in this case, since the insulating portion 65 as a part of the middle plate is disposed between the array body 15 and the bracket 41, it is necessary to ensure insulation between the array body 15 and the bracket 41. Can do.

  In the above embodiment, as shown in FIG. 1, the middle plate 61 is described as an example formed by two members of the reinforcing portion 63 and the insulating portion 65, but the present invention is not limited to this. For example, as shown in FIG. 7, the middle plate 261 may be provided with a resin coating (insulating portion) 265 on the surface of one side of the reinforcing portion 263 made of a metal material. Even in this configuration, since the middle plate is formed of a metal material, the strength of the whole middle plate is improved. Moreover, since the coating layer which consists of an insulating material is arrange | positioned between a reinforcement part and an array body, the insulation between the array body in which multiple battery cells are arranged, and an end plate is securable. As a result, it is possible to provide a battery module with excellent durability while ensuring insulation between the battery cell and the end plate. The resin coating 265 only needs to be applied to at least a portion of the middle plate 261 that is in contact with the array body 15. For example, the resin coating 265 may be applied to the entire middle plate 261.

  In the middle plate according to the modified example, the number of parts can be reduced, so that workability when the battery module is assembled is improved. Furthermore, it is not necessary to perform uneven processing on the reinforcing portion 63 and / or the insulating portion 65 in order to ensure the integrity of the reinforcing portion 63 and the insulating portion 65. Thereby, the man-hour at the time of manufacture can reduce and cost can be reduced.

  In the above embodiment, as illustrated in FIG. 1, an example in which the elastic member 31 is disposed on one side in the arrangement direction D has been described. However, the elastic member 31 may be disposed on at least one side, and may be disposed on both sides. Good. It is preferable to arrange the battery cells 11 on both sides in terms of allowing further expansion of the battery cells 11.

  In the above embodiment, as shown in FIG. 1, the bracket 41 is described as an example of the end plate that sandwiches the array body 15 and the elastic member 31. However, the bracket 41 includes the array body 15 and the elastic member. A bracket for fixing the battery module 1 to the wall portion 3 of the battery pack housing may be provided separately from the end plate sandwiching 31.

  DESCRIPTION OF SYMBOLS 1 ... Battery module, 11 ... Battery cell, 15 ... Array, 21 ... Cell holder, 31 ... Elastic member, 41 ... Bracket (end plate), 51 ... Bolt (connection member), 53 ... Nut (connection member), 61, 161, 261 ... Middle plate, 63, 163, 263 ... Reinforcement part, 63c ... First insertion hole, 64 ... First cylindrical part, 64a ... Inner space part, 65 ... Insulation part, 65c ... Second insertion hole, 66 ... 2nd cylindrical part, 66a ... Inner space part, 67 ... Insulating member, 71 ... Convex part, 73 ... Concave part, 171 ... Projection part, 265 ... Resin coating (insulating part).

Claims (8)

An array of a plurality of battery cells,
An elastic member disposed on at least one side in the arrangement direction of the array;
A pair of end plates sandwiching the array and the elastic member;
A connecting member for connecting the pair of end plates;
A middle plate disposed between the array and the elastic member;
With
The middle plate has a reinforcing portion made of a metal material and an insulating portion made of an insulating material,
The battery module, wherein the reinforcing portion and the insulating portion are in contact with each other.   The battery module according to claim 1, wherein the reinforcing portion is disposed on the elastic member side, and the insulating portion is disposed on the array body side. The connecting member is inserted through a first insertion hole formed in the reinforcing portion and a second insertion hole formed in the insulating portion,
The battery module according to claim 1, wherein an inner diameter of the first insertion hole is smaller than an inner diameter of the second insertion hole. The reinforcing portion is formed with a cylindrical portion that protrudes toward the insulating portion and has an inner space communicating with the first insertion hole.
The battery module according to claim 3, wherein the cylindrical portion is inserted into the second insertion hole.   The battery module according to claim 3 or 4, wherein an insulating member is disposed between an inner peripheral surface of the first insertion hole and an outer peripheral surface of the connecting member. On the mutually facing surfaces of the insulating portion and the reinforcing portion, there are formed concavo-convex portions that are uneven in the mutually opposing directions,
The battery module according to any one of claims 1 to 5, wherein the insulating portion and the reinforcing portion are fitted together by the uneven portion.   The battery module according to claim 6, wherein a convex portion of the concave and convex portion is formed on the reinforcing portion. When the area of the surface orthogonal to the extending direction of the connecting member in the reinforcing portion is the first area, and the area of the surface orthogonal to the extending direction of the connecting member in the insulating portion is the second area,
The battery module according to claim 1, wherein the second area is wider than the first area.

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