JP6358048B2 - Battery module - Google Patents

Description

  The present invention relates to a battery module.

  Conventionally, as a battery module, there exist some which were described in patent document 1, for example. In the battery module of Patent Document 1, a plurality of battery cells are arranged while being held by the cell holder, and the battery cells and the cell holder are sandwiched and restrained by end plates provided at both ends in the arrangement direction. The battery cell and the cell holder are constrained in contact with each other, and movement in the arrangement direction is restricted. The electrode terminals of adjacent battery cells are electrically connected by a bus bar, and the bus bar is engaged with a cell holder disposed between the battery cells.

JP 2014-149940 A

  In the battery module as described above, any battery cell may expand in the arrangement direction due to deterioration, overcharge, or the like. In the battery module of Patent Document 1, since the movement of the cell holder is restricted, when any battery cell expands, the bus bar connected to the electrode terminal of the battery cell is based on the engagement position with the cell holder. And the expansion of the battery cell is allowed by extending and deforming only the portion closer to the electrode terminal than the engagement position. When the portion of the bus bar reaches the limit of elongation and deformation, the cell holder does not follow the further expansion of the battery cell, so that an excessive load may act on the bus bar or the cell holder.

  This invention is made | formed in view of the said situation, and it aims at providing the battery module which can improve the followability of the cell holder with respect to expansion | swelling of a battery cell.

  A battery module according to the present invention includes a plurality of battery cells arranged in a state of being held by a cell holder, and an array body in which a temperature control member is interposed between adjacent battery cells, and at least one of the array bodies in the array direction. An elastic member arranged on the side, a battery cell, a temperature adjusting member, a restraining member that presses and restrains the elastic member in the arrangement direction, and a plurality of bus bars that electrically connect electrode terminals of adjacent battery cells The cell holder includes a frame body attached to the battery cell so that the side surface in the arrangement direction of the battery cells can be in contact with the temperature adjustment member, and the battery holder provided between the adjacent battery cells by the temperature adjustment member. And a protrusion provided in the partition and used for positioning the bus bar. The bus bar has an engaging portion that can be engaged with the protrusion, and is adjacent to the protrusion. Battery cell Spacing between at least one and the partition portion.

  In this battery module, when any battery cell expands in the arrangement direction, the side surface of the battery cell on the elastic member side moves to the elastic member side, and the electrode terminal of the expanded battery cell moves to the elastic member side. The distance between the electrode terminal and the electrode terminal of the battery cell opposite to the elastic member side of the battery cell is increased. At this time, the entire bus bar connecting the two electrode terminals is deformed so as to extend toward the elastic member, thereby absorbing the expansion of the battery cell. On the other hand, the cell holder moves to the elastic member side together with the bus bar by the protrusion engaging with the engaging portion of the bus bar. When the expansion further proceeds, the partition portion of the cell holder comes into contact with the battery cell on the elastic member side, thereby restricting the movement of the cell holder. Thus, the expansion of the battery cell can be absorbed until the partition portion of the cell holder contacts the battery cell on the elastic member side, and the followability of the cell holder to the expansion of the battery cell can be improved.

  Further, in the battery module according to the present invention, the engaging portion of the bus bar is a notch provided at the edge of the bus bar, and at least one side of the inner edge of the bus bar defined by the notch and the arrangement direction of the protrusions An interval may be provided between the two. In this battery module, since the partition portion of the cell holder can be further moved to the elastic member side by the distance between the inner edge of the bus bar and at least one side in the arrangement direction of the protrusions, the followability of the cell holder to the expansion of the battery cell can be improved. This can be further improved.

  In the battery module according to the present invention, the engagement position between the engagement portion and the protrusion is located on the outer side of the cell holder with respect to the connection position between the bus bar and the electrode terminal. You may have a bending part between connection positions. In this battery module, since the bus bars can be easily extended in the arrangement direction by the bent portion, the followability of the cell holder to the expansion of the battery cells can be improved.

  In the battery module according to the present invention, the bent portion may have a curved shape. In this battery module, for example, since the bent portion has a curved shape that is easier to extend than the bent shape, the followability of the cell holder to the expansion of the battery cell can be improved.

  ADVANTAGE OF THE INVENTION According to this invention, the battery module which can improve the followability of a cell holder with respect to expansion | swelling of a battery cell can be provided.

It is a top view which shows the battery module of embodiment. (A) is a perspective view which shows the battery cell hold | maintained at the cell holder, (b) is a perspective view which shows a cell holder. It is a figure which shows the battery module before expansion | swelling of a battery cell, (a) is a schematic plan view, (b) is a schematic sectional drawing in the BB line of (a). It is a figure which shows the battery module of the expansion process of a battery cell, (a) is a schematic plan view, (b) is a schematic sectional drawing in the BB line of (a). It is a figure which shows the battery module after the expansion | swelling of a battery cell, (a) is a schematic plan view, (b) is a schematic sectional drawing in the BB line of (a). It is a figure which shows the battery module of a comparative example, (a) is a schematic plan view which shows the battery module before expansion | swelling of a battery cell, (b) is a schematic plan view which shows the battery module after expansion | swelling of a battery cell. . It is a schematic sectional drawing which shows the bus bar of a modification.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or equivalent elements will be denoted by the same reference numerals, and redundant description will be omitted.

  FIG. 1 is a plan view showing the battery module of the embodiment. The battery module 1 of the embodiment shown in FIG. 1 is configured by arranging a plurality of battery cells 11. The battery module 1 is used in a state in which, for example, a plurality of battery modules 1 are accommodated in a casing to form a battery pack.

  As shown in FIG. 1, in the battery module 1 of the present embodiment, a plurality (seven in this example) of battery cells 11 are arranged in a state of being held by a cell holder 31. 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. Between the adjacent battery cells 11, a metal-made rectangular plate-shaped heat transfer plate 13 (a temperature control member, see FIG. 3B) is interposed. The heat transfer plate 13 is a member for adjusting the temperature of the battery cell 11. In this example, the temperature difference between the adjacent battery cells 11 is reduced. These battery cells 11, cell holders 31, and heat transfer plates 13 constitute an array 15. The configuration of the cell holder 31 will be described later.

  In addition to the array body 15, the battery module 1 includes an elastic member 17, a pair of restraining members 19, and a plurality of bus bars 51. The elastic member 17 is formed in a flat plate shape by rubber, for example. In this example, the elastic member 17 is arranged on one side (the right side in FIG. 1) in the arrangement direction D of the array body 15.

  The pair of restraining members 19 are members that press and restrain (clamp) the battery cell 11, the heat transfer plate 13, and the elastic member 17 in the arrangement direction D, and are so-called end plates. The restraining member 19 is made of a material having high rigidity such as iron. The pair of restraining members 19 are fixed by a plurality of bolts 23 extending in the arrangement direction D. Each bolt 23 is sequentially inserted into one restraining member 19, each cell holder 31, and the other restraining member 19, and is fastened by a nut 24 on the other restraining member 19 side. By this fastening, a binding force is applied to the array body 15. Further, a fixing bracket 25 is attached to the opposite side of each restraining member 19 from the array 15 by bolts 27. The bracket 25 is used for fixing the battery module 1 to the wall 3 of the battery pack housing. In this example, the bracket 25 is fixed to the wall portion 3 of the housing by a bolt 5.

  The bus bar 51 is made of metal and has a rectangular plate shape, and is made of, for example, copper. The bus bar 51 electrically connects the electrode terminals 12 of adjacent battery cells 11. More specifically, each battery cell 11 has a positive electrode terminal and a negative electrode terminal as electrode terminals 12, and the plurality of battery cells 11 are arranged so that electrode terminals 12 having different polarities are adjacent to each other. The bus bar 51 connects a plurality of battery cells 11 in series by connecting these adjacent electrode terminals 12 to each other.

  Next, the configuration of the cell holder 31 will be described. FIG. 2A is a perspective view showing a battery cell held by the cell holder, and FIG. 2B is a perspective view showing the cell holder. The cell holder 31 is made of resin, for example. As shown in FIG. 2, the cell holder 31 includes a frame 33, a partition portion 41, a terminal accommodating portion 43, and a pillar portion 47.

  The frame 33 includes, for example, a rectangular plate-like bottom plate 35 and a pair of rectangular plate-like side plates 37 that stand vertically from both ends in the longitudinal direction of the bottom plate 35 and face each other. In this example, the length of the bottom plate 35 in the short direction is the same as the length of the side plate 37 in the short direction. Each of both end portions in the longitudinal direction of the bottom plate 35 is provided with a protruding portion 35A that protrudes in the thickness direction of the bottom plate 35, and each of the protruding portions 35A has a through hole 35B extending in the short direction of the bottom plate 35. Is provided. The bolt 23 described above is inserted into the through hole 35B.

  A partition portion 41 is provided in the frame 33. The partition portion 41 has, for example, a rectangular plate shape, and extends perpendicularly to the side plates 37 to connect the side plates 37 to each other. In this example, the partition portion 41 extends from one end of the side plate 37 in the short side direction (the end on the back side in FIG. 2) in the middle portion of the side plate 37 in the longitudinal direction. Corresponds to the longitudinal direction of the side plate 37.

  A terminal accommodating portion 43 is provided in the partition portion 41. The terminal accommodating portion 43 is provided, for example, on one end surface (upper end surface in FIG. 2) in the short direction of the partition portion 41 at both longitudinal ends of the partition portion 41. The terminal accommodating portion 43 faces the bottom plate 35. In this example, the terminal accommodating portion 43 has a circular inner wall that surrounds the electrode terminal 12, and is open to one side (the front side in FIG. 2) in the thickness direction of the partition portion 41. The terminal accommodating portion 43 is continuous with each side plate 37.

  Further, the partition portion 41 is provided with a protrusion 45 used for positioning the bus bar 51. The protrusion 45 is, for example, a rectangular plate-shaped protrusion. In this example, the protrusion 45 protrudes from the end portion on the partition 41 side of one of the two terminal accommodation portions 43, and a pair of projections 45 is spaced apart in the longitudinal direction of the partition portion 41. Is provided. The protrusion 45 is located on the same plane as the partition portion 41. In addition, a pair of square columnar column portions 47 connected to the terminal accommodating portion 43 are provided on one end surface of the partition portion 41 in the short direction, and the thickness direction of the partition portion 41 is provided in each column portion 47. A through hole 47 </ b> A is provided extending in the direction. The bolt 23 described above is inserted into the through hole 47A.

  In the cell holder 31, a housing space S is formed by the frame body 33, the partition portion 41, the terminal housing portion 43, and the column portion 47. As shown in FIG. 2A, the battery cell 11 is held in the cell holder 31 by accommodating the battery cell 11 in the accommodation space S. In this state, the side surface of the battery cell 11 is covered with the frame 33. The accommodation space S is, for example, formed to be the same as or slightly larger than the outer shape of the battery cell 11. Thereby, the battery cell 11 is hold | maintained so that attachment or detachment is possible with respect to the cell holder 31 in the arrow A direction in Fig.2 (a). In a state where the battery cell 11 is accommodated in the accommodation space S, the electrode terminal 12 of the battery cell 11 is accommodated in the terminal accommodating portion 43.

  Further, in the cell holder 31, a rectangular opening 49 is formed by the frame 33 and one end surface (the lower end surface in FIG. 2) in the short direction of the partition portion 41. The opening 49 is provided for the arrangement of the heat transfer plate 13 as will be described later (see FIG. 3B). As shown in FIG. 3B, the opening 49 is formed, for example, the same as or slightly larger than the outer shape of the cross section perpendicular to the arrangement direction D of the heat transfer plates 13.

  As shown in FIG. 1, the cell holder 31 is arranged in the array 15 such that the partition 41 is located on the side opposite to the elastic member 17 side. In addition, the cell holder 31 is arranged so that the short side direction of the side plate 37 and the arrangement direction D of the array body 15 coincide with each other.

  The arrangement of each member in the battery module 1 will be further described. FIG. 3 is a view showing the battery module before expansion of the battery cell, FIG. 3 (a) is a schematic plan view, and FIG. 3 (b) is a schematic cross-sectional view taken along line BB in FIG. 3 (a). It is.

  As shown in FIG. 3, in the battery module 1, a plurality of battery cells 11 held by the cell holder 31 are arranged, and a heat transfer plate 13 is interposed between adjacent battery cells 11. As shown in FIG. 3B, the width of the heat transfer plate 13 in the arrangement direction D is larger than the width of the partition portion 41 in the arrangement direction D. The heat transfer plate 13 is disposed across one side and the other side in the arrangement direction D of the openings 49 described above, and is in contact with both adjacent battery cells 11.

  In other words, the cell holder 31 is attached to the battery cell 11 so that the side surface in the arrangement direction D of the battery cell 11 can contact the heat transfer plate 13. Moreover, the partition part 41 of the cell holder 31 is disposed in a gap formed between the adjacent battery cells 11 by the heat transfer plate 13, and separates the adjacent battery cells 11. The cell holder 31 is movable in the arrangement direction D with respect to the battery cell 11 and the heat transfer plate 13 by this gap. In this embodiment, the partition part 41 is arrange | positioned just in the intermediate position of the adjacent battery cell 11, and the space | interval d1 of the same length is provided between both the adjacent battery cells 11 and the partition part 41. FIG. . The electrode terminals 12 of the adjacent battery cells 11 are connected by a bus bar 51 arranged across one side and the other side in the arrangement direction D of the cell holders 31.

  The bus bar 51 has, for example, a rectangular cutout 53 as an engaging portion that can engage with the protrusion 45 of the partition portion 41. In this example, the notch 53 is provided at each of the pair of edge portions 55 in the short direction of the bus bar 51, and is formed at the central portion in the longitudinal direction of the bus bar 51. Further, the inner edge portion 57 of the bus bar 51 defined by the notch 53 is continuous with the pair of first portions 57A extending perpendicularly to the edge portions 55 and the pair of first portions 57A, and is parallel to the edge portions 55. And a second portion 57B extending in the direction. In the present embodiment, the length of the inner edge portion 57 in the arrangement direction D, that is, the length between the pair of first portions 57A is larger than the length of the protrusion 45 in the arrangement direction D.

  When the bus bar 51 is attached, the protrusion 45 is disposed in the notch 53 to position the bus bar 51 with respect to the electrode terminal 12 of the battery cell 11. The bus bar 51 is fixed to the electrode terminal 12 by bolts 61, for example. In this embodiment, in this state, as shown in FIG. 3A, a distance d2 having the same length is provided between each of the pair of first portions 57A and both side surfaces of the projection 45 in the arrangement direction D. Is provided. In the present embodiment, the length of the interval d2 is equal to the length of the interval d1. Further, the second portion 57B and the side surface in the direction perpendicular to the arrangement direction D of the protrusions 45 are in contact with each other.

  Further, in the present embodiment, as shown in FIG. 3B, the engagement position P1 between the notch 53 and the protrusion 45 is on the outer side of the cell holder 31 than the connection position P2 between the bus bar 51 and the electrode terminal 12. (Upper side in FIG. 3B). In this example, the bus bar 51 connects the flat plate portion at the center where the notch 53 is formed, the flat plate portions at both ends connected to the electrode terminal 12 at a position lower than the flat plate portion, and the flat plate portions. And an inclined surface. Due to this inclined surface, a bent portion 59 is formed on the bus bar 51 between the engagement position P1 and the connection position P2.

  Next, the following action of the battery module 1 with respect to the expansion of the battery cell 11 will be described with reference to FIGS. FIG. 3 shows the battery module 1 before expansion, FIG. 4 shows the battery module 1 in the expansion process, and FIG. 5 shows the battery module 1 after expansion. Below, the battery cell 11 is made into battery cell 11A, 11B, 11C in an order from the left side in FIGS. 3-5, these electrode terminals 12 are made into electrode terminal 12A, 12B, 12C, and the cell holder 31 holding these is the cell holder. This will be described as 31A, 31B, and 31C. A bus bar connecting the battery cells 11A and 11B is referred to as a bus bar 51A, and a bus bar connecting the battery cells 11B and 11C is referred to as 51B. 3 to 5 show examples where the battery cell 11B is deteriorated and expanded.

  When the battery cell 11B expands in the arrangement direction D from the state shown in FIG. 3, the side surface on the elastic member 17 side (right side in FIG. 4) of the battery cell 11B moves to the elastic member 17 side, and the electrode terminal 12B is elastic. Moving to the member 17 side, the distance between the electrode terminal 12B and the electrode terminal 12A of the battery cell 11A on the side opposite to the elastic member 17 side of the battery cell 11B increases. At this time, the entire bus bar 51A that connects the electrode terminals 12A and 12B is deformed so as to extend toward the elastic member 17, thereby absorbing the expansion of the battery cell 11B. As shown in FIG. 4B, the bus bar 51A extends from the connection position P2 with the electrode terminal 12A as a base point so that the bending angle of the bending portion 59 becomes large. When the expansion further proceeds, as shown in FIG. 4, the first portion 57A of the notch 53 of the bus bar 51A opposite to the elastic member 17 side is opposite to the elastic member 17 side of the protrusion 45 of the cell holder 31B. The notch 53 and the protrusion 45 are engaged with each other.

  When the expansion further proceeds from the state shown in FIG. 4, the side surface of the battery cell 11B on the elastic member 17 side further moves to the elastic member 17 side, the electrode terminal 12B further moves to the elastic member 17 side, and the bus bar 51A moves to the elastic member. Further stretches and deforms toward the 17 side. In FIG.5 (b), the bus bar 51A before the battery cell 11B expand | swells is shown with the broken line. At this time, when the protrusion 45 is hooked on the first portion 57A, the cell holder 31B moves to the elastic member 17 side together with the bus bar 51A. When the expansion further proceeds, as shown in FIG. 5, the partition portion 41 of the cell holder 31B comes into contact with the side surface opposite to the elastic member 17 side of the battery cell 11B, thereby restricting the movement of the cell holder 31B. . Thus, in the battery module 1, the expansion of the battery cell can be absorbed until the partition portion 41 of the expanding cell holder 31B comes into contact with the battery cell 11B, and the expansion of the battery cell 11B can be followed.

  Further, when the battery cell 11B expands in the arrangement direction D from the state shown in FIG. 3, the battery cell 11B expands evenly on both sides in the arrangement direction D. Therefore, the electrode terminal 12B on the opposite side to the electrode terminal 12B is also the same. The distance between the electrode terminal 12B and the electrode terminal 12C increases. At this time, the entire bus bar 51B is deformed so as to extend toward the elastic member 17, whereby the expansion of the battery cell 11B is absorbed. Although not shown, the bus bar 51B extends so that the bending angle of the bending portion 59 becomes large with the connection position with the electrode terminal 12B as a base point. When the expansion further proceeds, as shown in FIG. 4, the first portion 57A on the elastic member 17 side of the notch 53 of the bus bar 51B comes into contact with the side surface of the protrusion 45 of the cell holder 31C on the elastic member 17 side. Then, the notch 53 and the protrusion 45 are engaged. When the expansion further proceeds from this state, the bus bar 51 further extends and deforms toward the elastic member 17 side, and the protrusion 45 is hooked on the first portion 57A, whereby the cell holder 31C moves to the opposite side to the elastic member 17 side. When the expansion further proceeds, as shown in FIG. 5, the partition portion 41 of the cell holder 31C comes into contact with the side surface of the battery cell 11B on the elastic member 17 side, thereby restricting the movement of the cell holder 31C. The timing at which the partition portion 41 of the cell holder 31C contacts the battery cell 11B is the same as the timing at which the partition portion 41 of the cell holder 31B contacts the battery cell 11B.

The battery module of the comparative example compared with the battery module 1 of above-described embodiment is demonstrated.
FIG. 6 is a diagram showing a battery module of a comparative example, (a) is a schematic plan view showing the battery module before expansion of the battery cells, and (b) is a schematic showing the battery module after expansion of the battery cells. It is a top view. In the battery module 100 of the comparative example, the gap d1 is not provided between the adjacent battery cells 11 and the partitioning part 41, and between the inner edge part 57 of the notch 53 and the side surface in the arrangement direction D of the protrusion 45. Is different from the battery module 1 of the embodiment in that the distance d2 is not provided.

  In the battery module 100 of the modified example, in the state before expansion shown in FIG. 6A, the adjacent battery cell 11 and the partition portion 41 are in contact with each other, and the notch 53 and the protrusion 45 are engaged. In this state, the movement of the cell holder 31 in the arrangement direction D is restricted. Therefore, as shown in FIG. 6B, when the battery cell 11B expands in the arrangement direction D and the electrode terminal 12B moves toward the elastic member 17 in the battery module 100 of the modification, the cell holder 31B can move. Can not. Further, since the movement of the cell holder 31B is restricted, the bus bars 51A and 51B extend from the engagement position with the protrusion 45 as a base point, and only the portion on the electrode terminal 12B side extends and deforms from the engagement position. For this reason, in the battery module 100 of a modification, there exists a possibility that the expansion | swelling of the battery cell 11B cannot fully be absorbed.

  On the other hand, in the battery module 1 of the embodiment, as described above, when the battery cell 11B expands in the arrangement direction D and the electrode terminal 12B moves to the elastic member 17 side, the cell holder 31B moves to the elastic member 17 side. It moves, and it deform | transforms so that the whole bus-bar 51A may extend to the elastic member 17 side. Thus, in the battery module 1, the expansion of the battery cell 11B can be absorbed until the partition portion 41 of the cell holder 31B contacts the battery cell 11B, and the followability of the cell holder 31B to the expansion of the battery cell 11B is improved. Is possible. Similarly, in the battery module 1, the expansion of the battery cell 11B can be absorbed until the partition portion 41 of the cell holder 31C comes into contact with the battery cell 11B, and the followability of the cell holder 31C with respect to the expansion of the battery cell 11B is improved. It becomes possible.

  Further, according to the battery module 1, the partition portion 41 of the cell holder 31 is elastic member 17 by the distance d <b> 2 between the inner edge portion 57 (first portion 57 </ b> A) of the bus bar 51 and the side surface in the arrangement direction D of the protrusion 45. Since it can move further to the side, the followability of the cell holder 31B to the expansion of the battery cell 11B can be further improved.

  Moreover, according to the battery module 1, since the bus bar 51 can be easily extended in the arrangement direction by the bent portion 59, the followability of the cell holder 31B with respect to the expansion of the battery cell 11B can be improved.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments. The present invention can be modified without departing from the scope described in the claims or applied to other embodiments. May be.

  For example, in the above embodiment, an example in which the bent portion 59 is formed by a flat inclined portion has been described. However, as shown in FIG. 7, the bent portion is curved so that the inclined portion is convex upward. 59 may have a curved shape. In this case, since the bent portion 59 has a curved shape that is easier to extend in the arrangement direction than the bent shape, the followability of the cell holder 31B to the expansion of the battery cell 11B can be improved. Note that the bent portion 59 may be curved so that the inclined portion is convex downward.

  Moreover, in the said embodiment, although demonstrated that the space | interval d1 of the same length was provided between both the adjacent battery cells 11 and the partition part 41, it is not restricted to this, At least of the adjacent battery cells 11 is provided. It suffices if an interval is provided between one side and the partition 41. That is, in the above embodiment, the cell holder 31 can move in the arrangement direction D with respect to the battery cell 11 and the heat transfer plate 13 by the gap formed between the adjacent battery cells 11 by the heat transfer plate 13. Therefore, for example, the partition portion 41 may come into contact with one battery cell 11 of the adjacent battery cells 11, and a space may be provided only between the other battery cell 11. Even in this case, the cell holder 31 can follow the expansion of the battery cell 11 as in the case of the above embodiment.

  Similarly, in the above-described embodiment, it has been described that the interval d2 is provided between each of the pair of first portions 57A and both side surfaces of the protrusion 45 in the arrangement direction D. However, the present invention is not limited to this. It suffices if a gap is provided between the first portion 57 </ b> A and at least one side in the arrangement direction D of the protrusions 45. Further, in the present embodiment, the example in which the length of the interval d1 is equal to the length of the interval d2 has been described, but the magnitude relationship between the length of the interval d1 and the length of the interval d2 is not limited thereto.

  Moreover, although the said embodiment demonstrated the example which provided the space | interval d2 between the inner edge part 57 (1st part 57A) of the bus-bar 51, and the side surface of the arrangement direction D of the protrusion 45, even if this space | interval is not required Good. That is, the notch 53 and the protrusion 45 may be engaged with each other in a state before expansion. In this case, the battery cell 11B expands, the electrode terminal 12B moves to the elastic member 17 side, and the bus bar 51 starts to be deformed to the elastic member 17 side. At the same time, the cell holder 31B starts to move to the elastic member 17 side together with the bus bar 51. .

  Moreover, in the said embodiment, although the elastic member 17 was arrange | positioned at the one side in the arrangement direction D, what is necessary is just to arrange | position at least one side, and may arrange | position on both sides. The arrangement on both sides is preferable in that the expansion of the battery cell 11 can be further absorbed. Further, the shape and the like of the bus bar 51 are not limited to those illustrated, and may be any shape that can be extended and deformed in the arrangement direction D. For example, the entire bus bar 51 may have a flat plate shape, and may have a structure or material that can easily extend in the arrangement direction D. Moreover, as an engaging part, you may employ | adopt structures other than the illustrated notch 53, and also about the protrusion 45, what is necessary is just to engage with the said engaging part, and structures other than the illustrated projecting piece are sufficient. It may be adopted.

  Moreover, although the said embodiment demonstrated the example provided with the metal heat-transfer plates 13 as a temperature control member, a temperature control member may be a cooling member, for example. Examples of the cooling member include a member that forms a passage through which a cooling medium flows and a member that forms a passage through which an air layer flows. Further, the temperature adjustment member may be a heating member constituted by, for example, a heater. Furthermore, these temperature control members may be made of resin, for example.

DESCRIPTION OF SYMBOLS 1 ... Battery module, 11, 11A, 11B, 11C ... Battery cell, 12, 12A, 12B, 12C ... Electrode terminal, 13 ... Heat-transfer plate (temperature control member), 15 ... Array, 17 ... Elastic member, 19 ... Constraint member, 23 ... bolt, 25 ... bracket, 27 ... bolt, 31, 31A, 31B, 31C ... cell holder, 33 ... frame, 35 ... bottom plate, 37 ... side plate, 41 ... partition part, 43 ... terminal accommodating part, 45 ... Projection, 47 ... Column part, 49 ... Opening part, 51, 51A, 51B ... Bus bar, 53 ... Notch (engagement part), 55 ... Edge part, 57 ... Inner edge part, 57A ... First part, 57B ... 2nd part, 59 ... bending part, 61 ... bolt, P1 ... engagement position, P2 ... connection position, S ... accommodation space.

Claims (4)

A plurality of battery cells arranged in a state of being held by the cell holder, and an array formed by interposing a temperature control member between the adjacent battery cells,
An elastic member disposed on at least one side in the arrangement direction of the array;
A restraining member that pressurizes and restrains the battery cell, the temperature adjustment member, and the elastic member in the arrangement direction;
A plurality of bus bars that electrically connect the electrode terminals of the adjacent battery cells; and
The cell holder is provided on the frame body so that a side surface of the battery cell in the arrangement direction can contact the temperature control member, and the frame holder is adjacent to the temperature control member. A partition portion disposed in a gap formed between the battery cells, and a protrusion provided in the partition portion and used for positioning the bus bar,
The bus bar has an engaging portion engageable with the protrusion,
A battery module, wherein a space is provided between at least one of the adjacent battery cells and the partition portion. The engaging portion of the bus bar is a notch provided at an edge of the bus bar,
2. The battery module according to claim 1, wherein a space is provided between an inner edge portion of the bus bar defined by the notch and at least one side in the arrangement direction of the protrusions. The engagement position between the engagement portion and the protrusion is located on the outer side of the cell holder with respect to the connection position between the bus bar and the electrode terminal,
The battery module according to claim 1, wherein the bus bar has a bent portion between the engagement position and the connection position.   The battery module according to claim 3, wherein the bent portion has a curved shape.

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