JP2018101485A - Battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery pack capable of improving workability.SOLUTION: A battery pack 1 includes multiple battery modules 10A, and an enclosure 50 for housing them. The enclosure 50 has a body 60 in which an opening 60h is formed, and a lid 70 attached to the body 60 so as to close the opening 60h. The body 60 includes a bottom wall 61 and a sidewall 62. The opening 60h is formed by the end 62e of the sidewall 62. The lid 70 is attached to the end 62e. Some battery modules 10A are fixed to the bottom wall 61 by a fixing member 30A, and the remaining battery modules 10A are fixed to the lid 70 by the fixing member 30A. A protrusion 62p, protruding toward the inside of the opening 60h along the bottom wall 61 is formed at the end 62e. A recess 35 of a shape complementary to the protrusion 62p, viewing from second direction intersecting the bottom wall 61, is formed in the fixing member 30A.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a battery pack.

  Patent Document 1 describes a battery pack. This battery pack has a case. A battery module having a plurality of secondary batteries and a junction box are housed inside the case. The case has a square plate-shaped bottom, a square plate-shaped side portion standing vertically upward from the periphery of the bottom, and a top portion provided to face the bottom.

JP 2014-154240 A

  In the battery pack as described above, for example, a plurality of battery modules may be dispersed and fixed to the bottom and top of the case. In that case, a part of the plurality of battery modules is fixed to the bottom of the case in advance, the remaining part of the plurality of battery modules is fixed to the top in advance, and the battery pack is assembled by combining them. It is conceivable to configure. In such a situation, when the battery module is fixed to the bottom part of the case and when the top part to which the battery module is fixed is combined with the case, there is no alignment standard, and workability is lowered. To do.

  This invention is made | formed in view of such a situation, and it aims at providing the battery pack which can improve workability | operativity.

  In order to solve the above-described problem, a battery pack according to the present invention includes a stacked body including a plurality of battery cells stacked along a first direction, and fixing the stacked body disposed at both ends of the stacked body in the first direction. A plurality of battery modules having a pair of fixing members, and a housing that houses the plurality of battery modules. The housing includes a box-shaped main body having an opening and an opening. A lid attached to the body for closing, the body including a bottom wall and a side wall standing on the bottom wall, and the opening is formed by an end of the side wall opposite to the bottom wall. The lid is attached to the end, and some of the battery modules are fixed to the bottom wall by a fixing member, and the remaining battery modules of the plurality of battery modules Is fixed to the lid by a fixing member The end portion is formed with a convex portion projecting toward the inside of the opening along the bottom wall, and the fixing member is complementary to the convex portion when viewed from the second direction intersecting the bottom wall. A concave portion having a shape is formed.

  In this battery pack, a housing that houses a plurality of battery modules has a box-shaped main body in which an opening is formed, and a lid that is attached to the main body so as to close the opening. The main body includes a bottom wall and a side wall standing on the bottom wall and forming an opening at the end. The battery module is dispersed and fixed to the bottom wall and the lid. Therefore, when assembling this battery pack, it is conceivable to perform the following operations.

  That is, first, a part of the battery modules is inserted into the main body through the opening, and the first operation of fixing the part of the battery modules to the bottom wall by the fixing member is performed. On the other hand, after the remaining battery module is fixed to the lid by the fixing member, the second operation of attaching the lid with the battery module to the main body is performed. In the first and second operations, as described above, the workability may be deteriorated if there is no alignment reference.

  On the other hand, in this battery pack, a protruding portion that protrudes inside the opening along the bottom wall is formed at the end of the side wall that forms the opening. Moreover, the fixing member of the battery module is formed with a concave portion complementary to the convex portion. Therefore, first, in the first work, the battery module is inserted into the main body while using the concave portion and the convex portion as a reference for alignment so that the convex portion on the main body side passes through the concave portion on the battery module side. be able to.

  Furthermore, in the second operation, the battery module is used while using the concave portion and the convex portion as a reference for alignment so that the convex portion on the main body side is fitted to the concave portion on the battery module side fixed to the lid. An attached lid can be attached to the main body. Thus, according to this battery pack, it is possible to use the concave portion and the convex portion as a reference for alignment in both the first and second operations. As a result, according to this battery pack, assembly workability can be improved.

  In the battery pack according to the present invention, the side wall includes a pair of first side walls extending along the first direction and facing each other, and a plurality of battery modules are arranged along the first side wall, The battery modules may be formed at positions between the battery modules adjacent to each other along the first direction.

  At this time, the side wall includes a pair of second side walls extending along a third direction intersecting the first direction and the second direction and facing each other, and a plurality of battery modules are arranged along the second side wall. The convex portion may be formed at a position between the battery modules adjacent to each other along the third direction. In these cases, the convex portions can be shared between the battery modules adjacent to each other.

  In the battery pack according to the present invention, the second side wall may connect the first side walls to each other, and the convex portion may be provided at a connection portion between the first side wall and the second side wall. In this case, a convex part is formed in the corner | angular part which is a connection part of a 1st side wall and a 2nd side wall. For this reason, it is suppressed that a convex part interferes in the space of the center part of a main body and a lid | cover.

  In the battery pack according to the present invention, the recess may be a notch provided at a corner of the fixing member. In this case, it is possible to effectively utilize portions other than the corners of the fixing member, for example, by forming bolt holes.

  The battery pack according to the present invention further includes a seal member interposed between the end portion and the lid, and the lid is fastened to the end portion by a bolt in a state where the seal member is compressed between the end portion and the end portion. A bolt hole into which the bolt is screwed may be formed in the convex portion. In this case, it is possible to compress the seal member at the position of the convex portion by using the convex portion as a fastening portion between the main body and the lid. As a result, it is possible to contribute to the improvement of the sealing performance of the convex portion as the alignment reference.

  ADVANTAGE OF THE INVENTION According to this invention, the battery pack which can improve workability | operativity can be provided.

It is a schematic diagram which shows the battery pack which concerns on this embodiment. FIG. 2 is a side view of the battery module shown in FIG. 1. FIG. 2 is a plan view of the battery module shown in FIG. 1. It is a top view of the housing | casing shown by FIG. It is a top view which shows the battery pack which concerns on a modification.

  Hereinafter, an embodiment of a battery pack will be described with reference to the drawings. In the description of the drawings, the same elements or corresponding elements may be denoted by the same reference numerals, and overlapping descriptions may be omitted. In the following drawings, an orthogonal coordinate system S defined by the X axis, the Y axis, and the Z axis may be shown.

  FIG. 1 is a schematic diagram showing a battery pack according to the present embodiment. FIG. 1A is a plan view, and FIG. 1B is a side view. As shown in FIG. 1, the battery pack 1 includes a plurality (for example, seven) of battery modules 10 </ b> A and 10 </ b> B and a housing 50 that houses the battery modules.

  FIG. 2 is a side view of the battery module shown in FIG. FIG. 3 is a plan view of the battery module shown in FIG. 3A shows the battery module 10A, and FIG. 3B shows the battery module 10B. As illustrated in FIGS. 2 and 3, the battery module 10 </ b> A includes a stacked body 20 including a plurality of battery cells 11 stacked in a first direction (for example, the X-axis direction), and a stacked body 20 in the first direction. And a pair of fixing members 30 </ b> A used for restraining and fixing the laminated body 20. The battery module 10 </ b> A includes an elastic member 40 disposed between the one fixing member 30 </ b> A and the stacked body 20, and a middle plate 41 disposed between the elastic member 40 and the stacked body 20. ing.

  The battery cells 11 are arranged along the first direction in a state where the battery cells 11 are individually held by the cell holder 12, thereby constituting the stacked body 20. The battery cell 11 is a nonaqueous electrolyte secondary battery such as a lithium ion secondary battery. Bolts 31 are inserted through the pair of fixing members 30 </ b> A so as to be bridged with each other, and nuts 32 are screwed onto the ends of the bolts 31. Accordingly, the pair of fixing members 30 </ b> A applies a predetermined restraining load to the stacked body 20 (that is, the battery cell 11) and the elastic member 40.

  In other words, the fixing member 30 </ b> A is arranged in the first direction together with the battery cells 11, and includes a restraining portion 33 for applying a restraining load to the stacked body 20. The restricting portion 33 has, for example, a rectangular plate shape. The bolt 31 is inserted through the restraining portion 33. The fixing member 30 </ b> A includes a plate-like fixing portion 34 </ b> A extending from the restraining portion 33 along the first direction. Here, the fixing portion 34 </ b> A is formed integrally with the restraining portion 33. Thereby, the fixing member 30A is L-shaped as a whole.

  The fixed portion 34 </ b> A is in contact with the housing 50. The fixing member 30 </ b> A is fixed to the housing 50 by fastening the fixing portion 34 </ b> A to the housing 50 with the bolt B in a state where the fixing portion 34 </ b> A is in contact with the housing 50. Thereby, the laminated body 20 is fixed to the housing 50. The fixed portion 34A has a rectangular plate shape. A pair of bolt holes 34h through which the bolts B are inserted are formed in the center portion in the longitudinal direction of the fixed portion 34A.

  The fixed portion 34A includes a pair of corner portions 34p and 34q located on the side opposite to the connecting portion with the restraining portion 33. In the fixed portion 34A, a concave portion 35 is formed in a corner portion 34p of the corner portion 34p and the corner portion 34q. The recess 35 is a notch provided in the corner 34p, and penetrates the fixed portion 34A in the thickness direction of the fixed portion 34A. Here, the thickness direction of the fixing portion 34A is a second direction intersecting (orthogonal) with the first direction, for example, the Y-axis direction. The recess 35 is a rectangular notch when viewed from the second direction.

  Accordingly, the recess 35 includes two inner surfaces (sides as viewed from the second direction) 35s and 35r. The inner surface 35s is along the first direction and the second direction (as an example, along the XY plane). The inner surface 35r intersects (is orthogonal to) the first direction and is along the second direction (as an example, along the YZ plane). Therefore, the inner surface 35s and the inner surface 35r intersect (orthogonal) each other.

  On the other hand, as shown in FIGS. 2 and 3, the battery module 10 </ b> B is disposed at both ends of the stacked body 20 including the plurality of battery cells 11 stacked in the first direction and the stacked body 20 in the first direction. And a pair of fixing members 30 </ b> B used for restraining and fixing the laminated body 20. The battery module 10 </ b> B includes an elastic member 40 disposed between the one fixing member 30 </ b> B and the stacked body 20, and a middle plate 41 disposed between the elastic member 40 and the stacked body 20. ing.

  That is, the battery module 10B is the same as the battery module 10A except that the battery module 10B includes a fixing member 30B instead of the fixing member 30A. Bolts 31 are inserted through the pair of fixing members 30 </ b> B so as to be bridged with each other, and nuts 32 are screwed onto the tips of the bolts 31. Accordingly, the pair of fixing members 30 </ b> B applies a predetermined restraining load to the stacked body 20 (that is, the battery cell 11) and the elastic member 40.

  In other words, the fixing member 30 </ b> B includes the restraining portion 33 that is arranged in the first direction together with the battery cell 11 and applies a restraining load to the stacked body 20. The restricting portion 33 has, for example, a rectangular plate shape. The bolt 31 is inserted through the restraining portion 33. The fixing member 30B includes a plate-like fixing portion 34B extending from the restraining portion 33 along the first direction. Here, the fixing portion 34 </ b> B is formed integrally with the restraining portion 33. Thereby, the fixing member 30B is L-shaped as a whole.

  The fixing portion 34B is in contact with the housing 50. The fixing member 30B is fixed to the housing 50 by fastening the fixing portion 34B to the housing 50 with the bolt B in a state where the fixing portion 34B is in contact with the housing 50. Thereby, the laminated body 20 is fixed to the housing 50. The fixing portion 34B has a rectangular plate shape. A pair of bolt holes 34h through which the bolts B are inserted are formed in the central portion in the longitudinal direction of the fixed portion 34B. The fixing portion 34B includes a pair of corner portions 34p and 34q located on the side opposite to the connection portion with the restraining portion 33.

  In the fixed portion 34B, a concave portion 36 is formed in a corner portion 34q of the corner portion 34p and the corner portion 34q. The recessed part 36 is a notch provided in the corner part 34q, and penetrates the fixed part 34B in the thickness direction of the fixed part 34B. The recess 36 is a rectangular notch when viewed from the thickness direction of the fixed portion 34B. Here, the thickness direction of the fixing portion 34B is the second direction, for example, the Y-axis direction.

  Accordingly, the recess 36 includes two inner surfaces (sides as viewed from the second direction) 36s and 36r. The inner surface 36s is along the first direction and the second direction (as an example, along the XY plane). The inner surface 36s is substantially parallel to the inner surface 35s. The inner surface 36r intersects (is orthogonal to) the first direction and is along the second direction (as an example, along the YZ plane). The inner surface 36r is substantially parallel to the inner surface 35r. Therefore, the inner surface 36s and the inner surface 36r intersect (orthogonal) each other. The shape of the recess 36 substantially matches the shape of the recess 35.

  As described above, the fixing member 30A and the fixing member 30B are different from each other at the positions where the concave portions (the concave portions 35 and 36) are formed, and are the same as each other in the other portions. More specifically, the fixing member 30A and the fixing member 30B are different from each other in whether the concave portion 35 is formed in the corner portion 34p or the concave portion 36 is formed in the corner portion 35q, and are identical to each other. . Therefore, here, the battery pack 1 has two types of battery modules including different types of fixing members.

  Subsequently, the casing 50 will be specifically described. 4 is a plan view of the housing shown in FIG. In FIG. 1, four battery modules 10A and 10B are schematically arranged. As shown in FIGS. 1 and 4, the housing 50 includes a main body 60 and a lid 70. The main body 60 has a rectangular box shape, and the lid 70 has a rectangular plate shape. Thereby, the housing | casing 50 is exhibiting the rectangular parallelepiped shape as a whole.

  The main body 60 includes a rectangular plate-shaped bottom wall 61, a pair of side walls (first side walls) 62 that stand on the bottom wall 61 and face each other, and a pair of side walls (second walls) that stand on the bottom wall 61 and face each other. Side wall) 63. The side walls 62 and 63 have a rectangular plate shape. The side wall 62 extends along the first direction. The side wall 63 extends along a third direction (for example, the Z-axis direction) intersecting (orthogonal) with the first direction and the second direction.

  Here, a plurality (for example, two) of battery modules 10 </ b> A and 10 </ b> B are arranged along the side wall 62. A plurality (for example, two) of battery modules 10 </ b> A and 10 </ b> B are arranged along the side wall 63. The side wall 63 connects the side walls 62 to each other. Therefore, the side walls 62 and 63 have a rectangular ring shape as a whole. The side wall 63 is shorter than the side wall 62 when viewed from the second direction (for example, the Y-axis direction) intersecting the bottom wall 61.

  An opening 60 h is formed in the main body 60. The opening 60 h is formed by an end 62 e on the side wall 62 opposite to the bottom wall 61 and an end 63 e on the side wall 63 opposite to the bottom wall 61. Therefore, the opening 60h has a rectangular shape when viewed from the second direction. The lid 70 is attached to the end portions 62e and 63e and is attached to the main body 60 so as to close the opening 60h. Although not shown, an annular seal member is interposed between the lid 70 and the end portions 62e and 63e. The lid 70 is fastened to the end portions 62e and 63e by bolts (not shown) in a state where the seal member is compressed between the end portions 62e and 63e.

  The battery modules 10 </ b> A and 10 </ b> B are dispersed and fixed to the main body 60 and the lid 70. More specifically, some of the battery modules 10A and 10B among the battery modules 10A and 10B are fixed to the inner surface 61s (the surface facing the opening 60h) of the bottom wall 61 by the fixing members 30A and 30B. Fixed to the plane intersecting the direction).

  Further, the remaining battery modules 10A and 10B among the battery modules 10A and 10B are fixed to the inner surfaces 70s (surfaces facing the inner surface 61s and intersecting the second direction) of the lid 70 by the fixing members 30A and 30B. It is fixed to. As an example, one battery module 10A and two battery modules 10B may be fixed to the bottom wall 61, and two battery modules 10A and two battery modules 10B may be fixed to the lid 70.

  Here, a convex portion 62 p is formed at the end portion 62 e of the side wall 62. A convex portion 63p is formed at the end 63e of the side wall 63. The protrusions 62p and 63p protrude toward the inside of the opening 60h along the inner surface 61s of the bottom wall 61. Here, the convex portion 62p is formed at a position between the battery modules 10A and 10B adjacent to each other along the first direction. The convex portion 63p is formed at a position between the battery modules 10A and 10B adjacent to each other along the third direction. Between the pair of side walls 62, the protrusions 62p are provided at positions facing each other. Further, between the pair of side walls 63, the protrusions 63p are provided at positions facing each other.

  The convex portion 62p has, for example, a rectangular parallelepiped shape, and has a quadrangular shape when viewed from the second direction. Accordingly, the convex portion 62p has an outer surface (side viewed from the second direction) 62s along the first direction and the second direction, and a pair of outer surfaces (side viewed from the second direction) that intersect the first direction and extend along the second direction. ) 62r. The outer surface 62s is, for example, along the XY plane. The outer surface 62r is, for example, along the YZ plane. A bolt hole 62h into which a bolt used for fastening the lid 70 is screwed is formed in the convex portion 62p.

  The convex portion 63p has a rectangular parallelepiped shape, for example, and has a quadrangular shape when viewed from the second direction. Therefore, the convex portion 63p includes a pair of outer surfaces (sides viewed from the second direction) 63s along the first direction and the second direction, and an outer surface (sides viewed from the second direction) that intersects the first direction and extends along the second direction. ) 63r. The outer surface 63s is, for example, along the XY plane. The outer surface 63r is, for example, along the YZ plane. A bolt hole 62h into which a bolt used for fastening the lid 70 is screwed is formed in the convex portion 63p.

  The inner surface 35s of the concave portion 35, the inner surface 36s of the concave portion 36, the outer surface 62s of the convex portion 62p, and the outer surface 63s of the convex portion 63p are substantially parallel to each other. Further, the inner surface 35r of the concave portion 35, the inner surface 36r of the concave portion 36, the outer surface 62r of the convex portion 62p, and the outer surface 63r of the convex portion 63p are substantially parallel to each other. Then, the relative relationship between a convex part and a recessed part is demonstrated.

  The concave portions 35 and 36 have a shape complementary to the convex portions 62p and 63p when viewed from the second direction. Here, the concave portion having a shape complementary to the convex portion means that the convex portion can be arranged so as to overlap the concave portion, and at least one inner surface of the concave portion is at least one outer surface of the convex portion. Intended to face each other in a substantially parallel state.

  More specifically, first, when viewed from the second direction, a single pair of recesses 35 and recesses 36 are combined between the battery modules 10A and 10B adjacent to each other along the first direction. It arrange | positions so that the single convex part 62p may overlap in a recessed part (it fits). At this time, the inner surfaces 35s, 36s of the concave portions 35, 36 and the outer surface 62s of the convex portion 62p face each other in a substantially parallel state, and the inner surfaces 35r, 36r of the concave portions 35, 36 and the outer surface 62r of the convex portion 62p. They face each other in a substantially parallel state.

  Further, between the battery modules 10A and 10B adjacent to each other along the third direction, the single convex portion 63p overlaps with a single concave portion formed by combining the pair of concave portions 35 and the concave portion 36. (As fitted). At this time, the inner surfaces 35s, 36s of the concave portions 35, 36 and the outer surface 63s of the convex portion 63p face each other in a substantially parallel state, and the inner surfaces 35r, 36r of the concave portions 35, 36 and the outer surface 63r of the convex portion 63p. They face each other in a substantially parallel state.

  That is, here, the battery modules 10A and 10B are arranged such that the concave portions 35 and 36 are positioned corresponding to the convex portions 62p and 63p. More specifically, the four battery modules 10A and 10B at the same position in the second direction are positioned so that the four convex portions 62p and 63p enter the four sets of concave portions 35 and 36, respectively. In other words, the inner surfaces 35s, 35r, 36s, 36r of the recesses 35, 36 and the outer surfaces 62s, 63s, 62r, 63r of the protrusions 62p, 63p are used as the reference for positioning the battery modules 10A, 10B. it can.

  As described above, in the battery pack 1, the housing 50 that houses the plurality of battery modules 10A and 10B includes the box-shaped main body 60 in which the opening 60h is formed and the main body so as to close the opening 60h. And a lid 70 attached to 60. The main body 60 includes a bottom wall 61 and side walls 62 and 63 that stand on the bottom wall 61 and form openings 60h at the ends 62e and 63e. The battery modules 10 </ b> A and 10 </ b> B are dispersed and fixed to the bottom wall 61 and the lid 70. Therefore, when assembling the battery pack 1, it is conceivable to perform the following work.

  That is, first, a part of the battery modules 10A and 10B is inserted into the main body 60 through the opening 60h, and the part of the battery modules 10A and 10B is fixed to the bottom wall 61 by the fixing members 30A and 30B. Do work. On the other hand, after the remaining battery modules 10A and 10B are fixed to the lid 70 by the fixing members 30A and 30B, the second operation of attaching the lid 70 with the battery module to the main body 60 is performed. In the first and second operations, as described above, the workability may be deteriorated if there is no alignment reference.

  On the other hand, in the battery pack 1, the end portions 62e and 63e of the side walls 62 and 63 that form the opening portion 60h are provided with convex portions 62p that protrude along the bottom wall 61 to the inside of the opening portion 60h. 63p is formed. The fixing members 30A and 30B of the battery modules 10A and 10B are formed with concave portions 35 and 36 having shapes complementary to the convex portions 62p and 63p. Therefore, first, in the first work, the concave portions 35 and 36 and the convex portions 62p and 63p are set so that the convex portions 62p and 63p on the main body 60 side pass through the concave portions 35 and 36 on the battery modules 10A and 10B side. The battery modules 10A and 10B can be inserted into the main body 60 while being used as a reference for alignment.

  Further, in the second operation, the concave portions 35, 36 are fitted so that the convex portions 62 p, 63 p on the main body 60 side are fitted to the concave portions 35, 36 on the battery module 10 A, 10 B side fixed to the lid 70. And the cover 70 with a battery module can be attached to the main body 60, using the convex parts 62p and 63p as a reference for alignment. As described above, according to the battery pack 1, it is possible to use the concave portions 35 and 36 and the convex portions 62p and 63p as the alignment reference in both the first and second operations. As a result, according to the battery pack 1, the workability of assembly can be improved.

  In the battery pack 1, the side wall of the main body 60 includes a pair of side walls 62 that extend along the first direction and face each other, and a plurality of battery modules 10 </ b> A and 10 </ b> B are arranged along the side wall 62. And the convex part 62p is formed in the position between battery module 10A, 10B mutually adjacent along a 1st direction.

  Furthermore, in the battery pack 1, the side wall of the main body 60 includes a pair of side walls 63 that extend along a third direction intersecting the first direction and the second direction and face each other. Modules 10A and 10B are arranged. And the convex part 63p is formed in the position between battery module 10A, 10B mutually adjacent along a 3rd direction. Therefore, according to the battery pack 1, the convex parts 62p and 63p can be shared between the battery modules 10A and 10B adjacent to each other.

  On the other hand, the battery pack 1 further includes a sealing member interposed between the end portions 62e and 63e of the side walls 62 and 63 and the lid 70, and the lid 70 provides the sealing member between the end portions 62e and 63e. In the compressed state, it is fastened to the ends 62e and 63e by bolts. And the bolt holes 62h and 63h by which a volt | bolt is screwed are formed in the convex parts 62p and 63p. For this reason, it is possible to compress the seal member at the positions of the convex portions 62p and 63p by using the convex portions 62p and 63p as fastening portions between the main body 60 and the lid 70. As a result, the convex portions 62p and 63p as the alignment reference can be contributed to the improvement of the sealing performance.

  In the battery pack 1, the concave portions 35 and 36 are notches provided in the corner portions 34p and 34q of the fixing portions 34A and 34B of the fixing members 30A and 30B. For this reason, it becomes possible to effectively utilize the bolt holes 34h, for example, at portions other than the corner portions 34p, 34q of the fixing portions 34A, 34B (for example, central portions in the longitudinal direction). Moreover, the strength of the fixing portions 34A and 34B can be ensured by sufficiently separating the concave portions 35 and 36 from the bolt holes 34h.

  The above embodiment describes one embodiment of the battery pack according to the present invention. Therefore, the battery pack according to the present invention is not limited to the battery pack 1 described above. The battery pack according to the present invention can be obtained by arbitrarily changing the battery pack 1 as long as the gist of each claim is not changed.

  FIG. 5A is a plan view showing a battery pack according to a modification. As shown in FIG. 5 (a), the battery pack according to this modified example includes the battery module 10C instead of the battery modules 10A and 10B, and the aspect of the convex portion of the main body 60. Is different. The battery module 10C is different from the battery modules 10A and 10B in that the battery module 10C includes a fixing member 30C instead of the fixing members 30A and 30B. Further, the fixing member 30C is different from the fixing members 30A and 30B in that the fixing member 30C includes a fixing portion 34C instead of the fixing portions 34A and 34B.

  The fixed portion 34C has recesses 36 formed in both corner portions 34p and 34q. Accordingly, the fixed portion 34C is line symmetric with respect to the center line in the longitudinal direction (third direction). On the other hand, the convex part 63p is formed in the connection part of the side wall 62 and the side wall 63 here. Then, the battery module 10 </ b> C is arranged so that the convex portion 63 p overlaps (fits) with the concave portion 36. At this time, the inner surface 36s of the concave portion 36 and the outer surface 63s of the convex portion 63p face each other in a substantially parallel state, and the inner surface 36r of the concave portion 36 and the outer surface 63r of the convex portion 63p face each other in a substantially parallel state. .

  As described above, in the modified example of FIG. 5A, the convex portion 63p is provided at the corner portion that is the connecting portion between the side wall 62 and the side wall 63, and therefore the central portion of the main body 60 and the lid 70 is provided. It is suppressed that the convex part 63p interferes with a space. Thus, space efficiency is improved. Here, the fixed portion 34C has a symmetrical shape with respect to the center line. Therefore, a single type of fixing member 30C can be used regardless of the position of the battery module 10C in the main body 60, and the number of parts is reduced.

  FIG. 5B is a plan view showing a battery pack according to another modification. As shown in (b) of FIG. 5, the battery pack according to this another modification includes a battery module 10 </ b> D instead of the battery modules 10 </ b> A and 10 </ b> B, and the aspect of the convex portion in the main body 60. It is different from pack 1. The battery module 10D is different from the battery modules 10A and 10B in that the battery module 10D includes a fixing member 30D instead of the fixing members 30A and 30B. Furthermore, the fixing member 30D is different from the fixing members 30A and 30B in that a fixing portion 34D is provided instead of the fixing portions 34A and 34B.

  In the fixing portion 34D, the corner portions 34p and 34q are not provided with recesses, and the recess portion 36 is provided in the central portion between the corner portions 34p and 34q. Accordingly, the fixed portion 34D is also line-symmetric with respect to the center line in the longitudinal direction (third direction). On the other hand, the convex portion 63p is provided so as to overlap along the first direction with respect to the center of the battery module 10D in the third direction, not the position between the adjacent battery modules.

  And battery module 10D is arrange | positioned so that the convex part 63p may overlap with the recessed part 36 (it fits). At this time, the inner surface 36s of the concave portion 36 and the outer surface 63s of the convex portion 63p face each other in a substantially parallel state, and the inner surface 36r of the concave portion 36 and the outer surface 63r of the convex portion 63p face each other in a substantially parallel state. .

  Thus, in the modification of FIG. 5B, the fixing portion 34D has a symmetrical shape with respect to the center line. Therefore, a single type of fixing member 30D can be used regardless of the position of the battery module 10D in the main body 60, and the number of parts is reduced.

  As described above, the position where the concave portion is formed on the fixing member and the position where the convex portion is formed on the main body are not limited to the above example, and arbitrary positions that can be disposed overlapping each other can be selected. Also, the shape of the concave portion and the convex portion may be any shape as long as it can provide a positioning reference with complementary shapes. However, if the shape has two surfaces that intersect each other, such as the inner surface 35s and the inner surface 35r (that is, the outer surface 63s and the outer surface 63r), a positioning reference can be provided in two directions that intersect each other.

  DESCRIPTION OF SYMBOLS 1 ... Battery pack, 10A, 10B, 10C, 10D ... Battery module, 11 ... Battery cell, 20 ... Laminated body, 30A, 30B, 30C, 30D ... Fixing member, 35, 36 ... Recess, 50 ... Housing, 60 ... Main body, 60h ... opening, 61 ... bottom wall, 62 ... side wall (first side wall), 63 ... side wall (second side wall), 62e, 63e ... end, 62p, 63p ... convex, 62h, 63h ... bolt hole , 70 ... lid.

Claims (7)

A plurality of stacks including a plurality of battery cells stacked along the first direction, and a pair of fixing members disposed at both ends of the stack in the first direction and used for fixing the stack. A battery module;
A housing for housing the plurality of battery modules;
With
The housing has a box-shaped main body in which an opening is formed, and a lid attached to the main body so as to close the opening.
The main body includes a bottom wall and a side wall erected on the bottom wall,
The opening is formed by an end of the side wall opposite to the bottom wall,
The lid is attached to the end;
Some of the battery modules of the plurality of battery modules are fixed to the bottom wall by the fixing member,
The remaining battery module of the plurality of battery modules is fixed to the lid by the fixing member,
The end is formed with a protrusion that protrudes along the bottom wall toward the inside of the opening,
The fixing member is formed with a concave portion having a shape complementary to the convex portion as viewed from the second direction intersecting the bottom wall.
Battery pack. The side wall includes a pair of first side walls extending along the first direction and facing each other,
A plurality of the battery modules are arranged along the first side wall,
The convex portion is formed at a position between the battery modules adjacent to each other along the first direction.
The battery pack according to claim 1. The side wall includes a pair of second side walls extending along a third direction intersecting the first direction and the second direction and facing each other.
A plurality of the battery modules are arranged along the second side wall,
The convex portion is formed at a position between the battery modules adjacent to each other along the third direction.
The battery pack according to claim 2. The side walls extend along the first direction and face each other and a pair of first side walls, extend along a third direction intersecting the first direction and the second direction and face each other. A pair of second side walls connecting the side walls to each other,
The convex portion is provided at a connection portion between the first side wall and the second side wall.
The battery pack according to claim 1. The second sidewall connects the first sidewall to each other;
The convex portion is provided at a connection portion between the first side wall and the second side wall.
The battery pack according to claim 3. The recess is a notch provided in a corner of the fixing member.
The battery pack according to any one of claims 1 to 5. A seal member interposed between the end and the lid;
The lid is fastened to the end by a bolt in a state where the seal member is compressed between the end and the end,
The convex portion is formed with a bolt hole into which the bolt is screwed.
The battery pack according to any one of claims 1 to 6.

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