JPWO2017073416A1 - Power storage device - Google Patents

Abstract

Improves vibration resistance of the power storage device. The power storage device houses a power storage element and includes a housing including a first housing member and a second housing member, and a holding member provided with a support portion that supports a bottom portion of the second housing member And the flange of the first housing member, the flange of the second housing member, and the flange of the holding member are coupled with each other in an overlapping portion, and both of the flanges of the holding member are A fixed portion to be supported is provided.

Description

  The present invention relates to a power storage device.

  The power storage device mounted on the vehicle includes a vehicle fixing portion that is fixed to the vehicle. Patent Document 1 describes a battery pack including a bracket that directly supports a housing case for housing a secondary battery group on a vehicle frame.

JP 2012-84340 A

  Since the battery pack described in Patent Document 1 is configured to be fixed to the vehicle in a cantilever manner on one side, the vibration resistance is low. For example, the vehicle fixing portion may be damaged due to the vibration of the vehicle. .

  A power storage device according to one embodiment of the present invention includes a housing that stores a power storage element and includes a first housing member and a second housing member, and a support portion that supports a bottom portion of the second housing member. A holding member provided with a flange, the flange of the first casing member, the flange of the second casing member, and the flange of the holding member are coupled at an overlapping portion, and the holding member The flange is provided with a fixed portion that is supported at both ends.

  According to the present invention, the vibration resistance of the power storage device can be improved.

The external appearance perspective view of an electrical storage apparatus. The perspective view which shows the internal structure of an electrical storage apparatus. The perspective view of an electrical storage module. The exploded perspective view of an electrical storage apparatus. (A) is an assembly cross-sectional schematic diagram showing the cross-sectional structure of the housing, (b) is an exploded cross-sectional schematic diagram showing the cross-sectional structure of the housing. The cross-sectional schematic diagram which shows the state in which the electrical storage apparatus was attached to the bracket of the vehicle. It is an expansion schematic diagram of the fastening part which expands and shows the VII part of FIG. The figure explaining the effect of the improvement of vibration resistance. The figure explaining the attachment structure of the electrical storage apparatus which concerns on the modification 1, and the bracket of a vehicle. (A) is an assembly cross-sectional schematic diagram of the housing | casing which shows the holding plate which concerns on the modification 2, (b) is a decomposition | disassembly cross-sectional schematic diagram of the housing | casing which shows the holding plate which concerns on the modification 2. FIG.

  Hereinafter, an embodiment of a power storage device of the present invention will be described with reference to the drawings. FIG. 1 is an external perspective view of the power storage device 1. For convenience of explanation, in this specification, the horizontal direction, the front-rear direction, and the vertical direction of the power storage device 1 are as illustrated. The left-right direction, the front-rear direction, and the up-down direction of the power storage device 1 are directions orthogonal to each other.

  The power storage device 1 is applied to an in-vehicle power supply device in an electric motor drive system of an electric vehicle, for example, an electric vehicle. The concept of the electric vehicle includes a hybrid electric vehicle provided with an engine which is an internal combustion engine and an electric motor as a driving source of the vehicle, a genuine electric vehicle using the electric motor as the only driving source of the vehicle, and the like.

  As shown in FIG. 1, the power storage device 1 has a rectangular parallelepiped shape that is flat in the vertical direction, and includes a housing 10 including an upper case 2 and a lower case 3, and a plurality of housings accommodated in the housing 10. Power storage module 4 (see FIG. 2). Each of the upper case 2 and the lower case 3 is a bottomed rectangular box-shaped body (concave shape body) having one surface opened. The opening surface of the upper case 2 and the opening surface of the lower case 3 are opposed to each other, and are coupled in a state in which flanges 20 and 30 described later are brought into contact with each other, thereby accommodating each power storage module 4 (see FIG. 2). The housing | casing 10 which has the accommodation space for is formed. The upper case 2 and the lower case 3 are formed by processing a metal plate such as a galvanized steel plate, for example. Each of the upper case 2 and the lower case 3 has a thickness of about 1 mm.

  FIG. 2 is a perspective view showing the internal structure of the power storage device 1. FIG. 2 shows the power storage device 1 with the upper case 2 removed. As shown in FIG. 2, the power storage device 1 includes nine power storage modules 4 arranged in two rows, a front row and a rear row, and an SD (service disconnect) switch 6 disposed at the right rear corner of the power storage device 1. And.

  The plurality of power storage modules 4 are electrically connected in series by a conductive member (not shown) such as a bus bar. The SD switch 6 is provided between the plurality of power storage modules 4 constituting the battery block on the high potential side and the plurality of power storage modules 4 constituting the battery block on the low potential side. The SD switch 6 includes an electric circuit in which a switch (not shown) and a fuse are connected in series. The SD switch 6 is a safety device provided to ensure safety during maintenance and inspection of the power storage module 4. The SD switch 6 is operated by a service person when performing maintenance and inspection.

  FIG. 3 is a perspective view of the power storage module 4. FIG.3 (b) is a perspective view of the electrical storage module 4 seen from the opposite side to Fig.3 (a). Since each power storage module 4 has the same configuration, one power storage module 4 arranged in the rear row shown in FIG. 2 will be described as a representative. The front power storage module 4 and the rear power storage module 4 are disposed in the opposite directions.

  The power storage module 4 has power storage elements 9 arranged in two upper and lower stages. Each power storage element 9 is, for example, a lithium ion battery and has a cylindrical shape. Each power storage element 9 is arranged so that the central axes of the power storage elements 9 are parallel to each other. The storage elements 9 are electrically connected to each other by a bus bar 23 that is a conductive member. Three storage elements 9 are arranged in the upper stage and four in the lower stage. The upper storage elements 9 are arranged so as to be shifted from the lower storage elements 9 by half the interval (pitch) of the storage elements 9 in the front-rear direction. In other words, each power storage element 9 in the upper stage is positioned at an intermediate position between the storage elements 9 arranged adjacent to each other in the lower stage in the axial center (axial center) of the power storage element 9. With this structure, the overall height of the power storage module 4 is reduced.

  FIG. 4 is an exploded perspective view of the power storage device 1. As shown in FIG. 4, the lower case 3 includes a rectangular flat bottom 39, a front wall portion 31 and a rear wall portion 32 that face each other in the front-rear direction, and a left wall that faces the front wall portion 31 in the left-right direction. Part 36 and right wall part 35. The front wall part 31, the rear wall part 32, the left wall part 36, and the right wall part 35 are inclined so as to spread laterally from the bottom part 39 toward the upper side. For this reason, the lower case 3 defines a rectangular frustum-shaped accommodation space in which the area of the front, rear, left, and right planes (that is, the plane orthogonal to the vertical direction) increases from the bottom 39 toward the opening surface. .

  The lower case 3 is provided with a plurality of partition walls 33 along a direction orthogonal to the front wall portion 31 and the rear wall portion 32. The interior of the housing 10 is partitioned by the partition wall 33 into a storage chamber 101 in which each power storage module 4 is disposed and a storage chamber 102 in which the SD switch 6 is stored. The partition wall 33 is fixed to the bottom 39, the front wall 31, and the rear wall 32 of the lower case 3. The top portion of the partition wall 33 is provided with an abutting portion 33a that abuts against the top plate 29 of the upper case 2 when the upper case 2 and the lower case 3 are coupled. That is, the partition wall 33 serves as a beam that supports the upper case 2.

  The upper case 2 does not include the partition wall 33, but has the same configuration as the lower case 3. That is, the upper case 2 includes a rectangular flat plate top plate 29, a front wall portion 21 and a rear wall portion 22 that face each other in the front-rear direction, and a left wall portion 26 and a right wall that face each other in the left-right direction. Part 25. The front wall portion 21, the rear wall portion 22, the left wall portion 26 and the right wall portion 25 are inclined so as to spread laterally from the top plate 29 toward the lower side. For this reason, the upper case 2 defines a rectangular frustum-shaped accommodation space in which the area of the front, rear, left, and right planes (that is, the plane orthogonal to the vertical direction) increases from the top plate 29 toward the opening surface. .

  At the opening edge of the lower case 3, a flange (hereinafter referred to as a lower flange 30) extending to the side of the housing 10 (left and right front and rear sides) along the opening edge along the entire periphery of the opening edge. Is written). On the opening edge of the upper case 2, a flange (hereinafter referred to as an upper flange 20) extending to the side of the housing 10 (left and right front and rear sides) along the opening edge along the entire periphery of the opening edge. ) Is provided.

  Below the lower case 3, a holding plate 5 that is attached to the vehicle and holds the housing 10 in which the power storage module 4 is accommodated is disposed. The holding plate 5 includes a rectangular flat plate-like support portion 59, a front plate 51 rising from the front end edge of the support portion 59, and a rear plate 52 rising from the rear end edge of the support portion 59. At three locations on the upper edge of the front plate 51, flanges (hereinafter referred to as holding flanges 50) that are bent and extend forward from the upper edge of the front plate 51 are provided. Similarly, holding flanges 50 that are bent and extend rearward from the upper end edge of the rear plate 52 are provided at three positions on the upper end edge of the rear plate 52. As will be described later, the holding flange 50 is formed with a vehicle fixing portion 55 that is placed on a mounting bracket 90 (see FIG. 6), which is a vehicle-side component, and is fixed to the mounting bracket 90 with a bolt Ba. .

  The holding plate 5 is formed by, for example, processing a metal plate such as a galvanized steel plate. Each of the holding plates 5 has a thickness of about several mm (2 to 3 mm), and is thicker than the thicknesses of the upper case 2 and the lower case 3 described above. The thickness of the holding plate 5 is increased in this way, as will be described later, the holding plate 5 is a member that receives vibrations and shocks on the vehicle side, and the power storage accommodated in the housing 10 and the housing 10. This is because it is a member that holds a heavy object such as the module 4. On the other hand, since the housing 10 only needs to be able to form a sealed space for housing the power storage module 4, it does not require strength as compared with the holding plate 5, so that the plate thickness can be reduced.

  FIG. 5A is an assembled cross-sectional schematic diagram showing the cross-sectional structure of the housing 10, and FIG. 5B is an exploded cross-sectional schematic diagram showing the cross-sectional structure of the housing 10. FIG. 5 is a schematic cross-sectional view taken along the plane VV in FIG. 1, and the illustration of the internal structure of the housing 10 is omitted. 6 is a schematic cross-sectional view taken along the plane VV of FIG. 1 and shows a state in which the power storage device 1 is attached to a mounting bracket 90 provided on the floor panel F of the vehicle. . In FIG. 6, for convenience of explanation, a cross section taken along a VI-VI line (see FIG. 1) passing through a hole through which each of the bolt Ba and the bolt Bb is inserted is schematically shown in the bolt fastening portion. . Further, the power storage module 4 is schematically illustrated by hatching.

  As shown in FIGS. 5 and 6, the holding plate 5 has the same cross-sectional shape as the lower case 3, and the lower case so that the inner surface of the holding plate 5 contacts the outer surface of the lower case 3. 3 along the shape. The support portion 59 is a portion that contacts the lower surface of the bottom portion 39 of the lower case 3, that is, the bottom surface of the housing 10 and supports the lower case 3. The front plate 51 is in contact with the outer surface of the front wall portion 31 of the lower case 3, and the rear plate 52 is in contact with the outer surface of the rear wall portion 32 of the lower case 3.

  The holding plate 5 is fixed to the lower case 3 while being in contact with the bottom surface and the front and rear side surfaces of the lower case 3 so as to hold the lower case 3. In the present embodiment, the support portion 59 of the holding plate 5 and the bottom portion 39 of the lower case 3 are spot-welded over a plurality of locations and are joined at a spot weld portion (not shown). Similarly, the front plate 51 of the holding plate 5 and the front wall portion 31 of the lower case 3 are similarly spot welded over a plurality of locations, and the rear plate 52 of the holding plate 5 and the rear wall portion 32 of the lower case 3 are also the same. Are spot welded over a plurality of locations, and are joined at a spot weld. Accordingly, the lower case 3 is held by the holding plate 5 in a state where the bottom 39 is supported by the holding plate 5 and is sandwiched from the front and rear.

  FIG. 7 is an enlarged schematic view of a fastening portion showing the VII portion of FIG. 6 in an enlarged manner. As shown in FIG. 7, the lower flange 30 of the lower case 3 and the upper flange 20 of the upper case 2 are overlapped with each other, and a stacked portion in which two plates are stacked (hereinafter referred to as a two-layer overlapping portion 80). ) Is formed. The two-layer overlapping portion 80 is formed over the entire periphery of the opening edge. In the W portion in FIG. 1, the lower flange 30 and the upper flange 20 are fastened together by bolts Bb and nuts (not shown) in the two-layer overlapping portion 80. As shown in FIG. 4, the head of the bolt Bb is welded with the shaft portion inserted into a hole provided in one of the lower flange 30 and the upper flange 20. The other of the lower flange 30 and the upper flange 20 is provided with a bolt hole H through which the shaft portion of the bolt Bb protruding from one flange is inserted. The shaft portion of the bolt Bb welded to one of the lower flange 30 and the upper flange 20 is inserted into the other bolt hole H, and a nut Nb (see FIG. 7) is screwed into a thread groove provided in the shaft portion. Thus, the lower flange 30 and the upper flange 20 are fastened.

  As shown in FIG. 7, the upper flange 20 and the side plates of the upper case 2 (front wall portion 21 (not shown in FIG. 7), rear wall portion 22, right wall portion 25 (not shown in FIG. 7), and left wall portion 26. (Not shown in FIG. 7) is provided with a stepped portion 27. A rectangular annular sealing member 60 is disposed in a recess of the stepped portion 27 provided inside the housing 10 in plan view. The seal member 60 is provided to ensure the airtightness of the housing 10, and is sandwiched in the vertical direction by the upper case 2 and the lower case 3 and is held in a compressed state.

  Thereby, the inside of the housing | casing 10 is made into the sealed space, and it is prevented that a liquid and dust penetrate | invade into an inside from the exterior of the housing | casing 10. FIG. Further, in the power storage element 9, when an overcharge or a short circuit occurs and heat is generated, and the safety valve of the power storage element 9 is activated and high temperature gas is released from the power storage element 9, the gas is in the upper case 2 and the lower case 3. It is possible to prevent leakage from between. In addition, gas is discharged | emitted to a predetermined place via the discharge hose etc. which are not shown in figure.

  As shown in FIG. 4, a first bolt insertion hole 50 a is provided in the vehicle fixing portion 55 of each holding flange 50 (six locations in the present embodiment). A second flange insertion hole 50b is provided in the holding flange 50 (hereinafter referred to as holding flange 50M) disposed between the holding flange 50 at the left end of the holding plate 5 and the holding flange 50 at the right end.

  The two-layer overlapping portion 80 is formed in a rectangular shape in plan view over the entire circumference of the side portion of the housing 10. A part of the two-layer overlapping portion 80 is further overlapped with the holding flange 50 of the holding plate 5 to form a stacked portion in which three plates are stacked (hereinafter referred to as a three-layer overlapping portion 81) (see FIG. (See also T section in 1). In the three-layer overlapping portion 81, the two-layer overlapping portion 80 is supported from the lower side by the lowermost holding flange 50.

  As shown in FIG. 7, in the three-layer overlapping portion 81 having the holding flange 50M, the holes provided in the upper flange 20 and the lower flange 30 and the second bolt insertion holes 50b of the holding flanges 50M (see FIG. 4). ), The upper flange 20, the lower flange 30, and the holding flange 50 are fastened together by inserting the nut Nb into the shaft portion of the bolt Bb.

  As shown in FIG. 6, a plurality of mounting brackets 90 are provided on the floor panel F of the vehicle at predetermined intervals. The power storage device 1 is attached to the vehicle by inserting the bolt Ba into the first bolt insertion hole 50 a of each holding flange 50 from above and screwing the shaft portion of the bolt Ba into the thread groove of the mounting bracket 90. When the holding flange 50 is fastened to the mounting bracket 90 by the bolt Ba, the power storage device 1 is supported at both ends by the mounting brackets 90 at both front and rear ends.

  In addition, the bottom part of the electrical storage apparatus 1 and the floor panel F of the vehicle are separated by a predetermined distance, and the electrical storage apparatus 1 and the floor panel F of the vehicle come into contact with each other when a vibration or impact is applied to the vehicle. Is prevented.

  The effect of improving the vibration resistance according to the present embodiment will be described in comparison with a comparative example. FIG. 8 is a diagram for explaining the effect of improving vibration resistance. FIG. 8A is a schematic diagram showing power storage device 1 according to the present embodiment, and FIG. 8B is a schematic diagram showing power storage device 1Z according to a comparative example. For example, FIG. 8 illustrates a case where vibration is applied in the horizontal direction (the front-rear direction of the power storage device). As shown in FIG. 8A, in the present embodiment, the upper flange 20, the lower flange 30, and the holding flange 50M have a fastening portion that is fastened together by a bolt Bb. Therefore, the vibration generated in the vehicle is transmitted to the holding flange 50M via the bolt Ba, and the vibration transmitted to the holding flange 50M is transmitted to the upper flange 20 and the lower flange 30 via the bolt Bb in the three-layer overlapping portion 81. It is transmitted. The thickness of the three-layer overlapping portion 81 is the sum of the plate thickness of the upper flange 20, the plate thickness of the lower flange 30, and the plate thickness of the holding flange 50M, and has high rigidity. For this reason, an intensity | strength can be improved with respect to the vibration of a vehicle.

  Further, the vibration transmitted to the three-layer overlapping portion 81 is distributed to the upper case 2 and the lower case 3, and can receive the vibration force distributed throughout the casing 10, and the stress acting on the casing 10. Can be relaxed.

As shown in FIG. 8B, in the comparative example, the holding flange 50Z of the holding plate 5Z extends linearly from the support portion 59 to the side, and is in contact with the upper flange 20 and the lower flange 30. Absent. For this reason, the vibration transmitted to the holding flange 50 </ b> Z is transmitted to the housing 10 through the spot welded portion of the bottom 39 of the lower case 3. In the comparative example, the vibration force Fb2 transmitted from the spot welded portion WP at the center of the bottom of the housing 10 to the housing 10 is representatively shown. In the comparative example, almost no stress is generated in the upper flange 20 and the lower flange 30. That is, in the comparative example, the upper flange 20 and the lower flange 30 are not configured as strength members that absorb vibration. Moreover, almost no stress is generated in the upper case 2 that is far from the spot welded portion WP. That is, the upper case 2 is not configured as a strength member that absorbs vibration. In the comparative example, the stress is concentrated on the base part (the part rising from the bottom part 39) of the side plate (the front wall part 31 and the rear wall part 32) of the lower case 3.

  In the comparative example, since the housing 10 is joined only to the support portion 59 of the holding plate 5Z, the distance of the perpendicular dropped from the support portion 59 to the center of gravity G of the housing 10 housing the power storage module 4 (that is, the center of gravity G). To the moment arm L2, which is the distance of the perpendicular line dropped to the spot weld WP, which is the point of action of the vibration force. On the other hand, in the present embodiment, the fastening portion of the bolt Bb in the three-layer overlapping portion 81 is provided at a substantially central portion in the vertical direction of the housing 10. For this reason, the moment arm L1 which is the distance of the perpendicular line dropped from the bolt Bb serving as a fulcrum in the three-layer overlapping portion 81 to the center of gravity G of the housing 10 housing the power storage module 4 can be shortened (L1 <L2).

  In the present embodiment, as in the comparative example, the casing 10 and the holding plate 5 are coupled to each other in the spot welded portion WP. That is, in this embodiment, since the housing 10 and the holding plate 5 are coupled to each other at both the spot welded portion WP and the fastening portion of the bolt Bb, the vibration force Fb1 of the housing 10 is dispersed from the holding plate 5. It is transmitted. That is, in the present embodiment, the vibration force acting on each coupling portion can be reduced as compared with the comparative example (Fb1 <Fb2).

  In the present embodiment, since the coupling portion is provided at a position where the moment arm L2 is shortened, the sum of the moments acting on the housing 10 with each coupling portion as a fulcrum is the sum of the moments similarly generated in the comparative example. Compared to Thus, according to the present embodiment, the moment can be reduced as compared with the comparative example, so that the concentration of stress on the housing 10 can be suppressed.

  Although not shown, in this embodiment, spot welding is also performed on the front wall portion 31 of the lower case 3 and the front plate 51 of the holding plate 5, as well as the rear wall portion 32 of the lower case 3 and the rear plate 52 of the holding plate 5. The part is formed. For this reason, the contact area between the lower case 3 and the holding plate 5 is larger than that of the comparative example, and the vibration force is further dispersed and transmitted to the housing 10 as compared with the comparative example.

According to the embodiment described above, the following operational effects can be obtained.
(1) The power storage device 1 accommodates the power storage element 9 and includes a housing 10 including the upper case 2 and the lower case 3, and a holding plate provided with a support portion 59 that supports the bottom 39 of the lower case 3. 5 is provided. The upper flange 20 of the upper case 2, the lower flange 30 of the lower case 3, and the holding flange 50 </ b> M of the holding plate 5 are coupled by a three-layer overlapping portion 81 that overlaps each other. A vehicle fixing portion 55 that is supported at both ends by the mounting bracket 90 is provided. Thereby, the vibration resistance and impact resistance of the power storage device 1 can be improved.

(2) The holding plate 5 was made thicker than the upper case 2 and the lower case 3. Thereby, the housing | casing 10 which accommodated the electrical storage module 4 which is a heavy article is supported, and sufficient intensity | strength can be ensured with respect to the vibration and impact from a vehicle. Note that the upper case 2 and the lower case 3 only need to be able to define a sealed space for housing the power storage module 4, and thus can be made thinner than the holding plate 5. Thereby, the mass and cost of power storage device 1 can be reduced.

(3) A seal member 60 is provided between the upper case 2 and the lower case 3, and the upper flange 20 of the upper case 2, the lower flange 30 of the lower case 3, and the holding flange 50M of the holding plate 5 are: The three-layer overlapping portion 81 is fastened together with a bolt Bb. Thereby, the upper case 2 and the lower case 3 can be easily coupled and separated, and the maintainability is improved. Moreover, since the sealing member 60 can ensure the airtightness of the housing 10, it is possible to prevent liquid and dust from entering the inside from the outside of the housing 10. Further, in the power storage element 9, when an overcharge or a short circuit occurs and heat is generated, and the safety valve of the power storage element 9 is activated and high temperature gas is released from the power storage element 9, the gas is in the upper case 2 and the lower case 3. It is possible to prevent leakage from between.

(4) The upper case 2 and the lower case 3 are box-like bodies each having one surface opened, and the upper flange 20 of the upper case 2 is formed along the opening edge of the upper case 2 and The lower flange 30 of the case 3 is formed along the opening edge of the lower case 3. The three-layer overlapping portion 81 is provided between the top plate 29 that is the bottom of the upper case 2 that is a box-shaped body and the bottom 39 of the lower case 3 that is a box-shaped body. With such a configuration, the casing 10 can be easily formed by abutting the flanges of the upper case 2 and the lower case 3 together. Further, as shown in FIG. 8, when a horizontal vibration force acts on the power storage device 1, the bolt Bb serving as a fulcrum in the three-layer overlapping portion 81 is lowered to the center of gravity G of the housing 10 housing the power storage module 4. Since the moment arm L1, which is the distance of the perpendicular, can be shortened, the moment acting on the power storage device 1 can be reduced.

The following modifications are also within the scope of the present invention, and one or a plurality of modifications can be combined with the above-described embodiment.
(Modification 1)
In the above-described embodiment, the example in which the bolt Ba is fastened only to the vehicle fixing portion 55 of the holding plate 5 has been described, but the present invention is not limited to this. As shown in FIG. 9A, the lower flange 30 is extended in the horizontal direction so as to overlap the vehicle fixing portion 55, and the overlapping portion where the lower flange 30 and the vehicle fixing portion 55 overlap is attached to the mounting bracket 90 by the bolt Ba. It may be fixed. That is, the vehicle fixing portion 55 may be provided in a portion where the holding flange 50 and the lower flange 30 overlap.

  As shown in FIG. 9B, the upper flange 20 and the lower flange 30 are extended in the horizontal direction so as to overlap the vehicle fixing portion 55, and the overlapping portion where the upper flange 20, the lower flange 30 and the vehicle fixing portion 55 overlap. May be fixed to the mounting bracket 90 with a bolt Ba. In other words, the vehicle fixing portion 55 may be provided in the three-layer overlapping portion 81, and the three-layer overlapping portion 81 may be fastened together with the bolt Ba and fixed to the mounting bracket 90.

  In the example shown in FIG. 9A, the plate thickness of the portion to which the bolt Ba is fastened is thicker than that of the above-described embodiment, so that the strength is improved. In the example shown in FIG. 9B, since the plate thickness of the portion to which the bolt Ba is fastened is thicker than that in the example shown in FIG. 9A, the strength is improved. As described above, in the three-layer overlapping portion 81, multiplexing of a function having a sealing function and a fixing function to the vehicle can be realized, so that the power storage device 1 can be downsized.

(Modification 2)
Instead of the holding plate 5 described in the above embodiment, a pair of holding plates 5B may be provided as shown in FIG. The holding plate 5B has a configuration in which the rectangular region at the center in the front-rear direction of the above-described holding plate 5 (see FIGS. 4 and 5) is removed and divided into front and rear. Even in such a configuration, the holding plate 5B is disposed so as to cover the bottom 39 of the lower case 3, and the front wall 31 and the rear wall 32 of the lower case 3, as in the above-described embodiment. Thus, the housing 10 can be supported. That is, the holding member is not limited to a plate shape, and includes a support portion 59 that supports at least a part of the bottom 39 of the housing 10, a portion that covers a part of the side surface of the housing 10, the upper flange 20, and What is necessary is just to have the holding flange 50 couple | bonded with the lower flange 30 and attached to the components by the side of a vehicle, and can be made into various shapes.

(Modification 3)
In the above-described embodiment, the example in which the same galvanized steel plate is used as the material of the upper case 2 and the lower case 3 and the material of the holding plate 5 including the support portion 59 has been described. It is not limited. Since the upper case 2 and the lower case 3 can be lower in rigidity than the holding plate 5, a part or all of the upper case 2 and the lower case 3 may be formed of a resin material. As a result, the degree of freedom in design can be improved and the cost can be reduced. Further, in addition to an example in which a metal is used for the material of the upper case 2 and the lower case 3 and a resin is used for the material of the holding plate 5, the materials of the upper case 2 and the lower case 3 and the holding plate 5 are different. Metal materials can also be used. For example, an aluminum alloy plate may be adopted as the material of the upper case 2 and the lower case 3, and a stainless steel plate having higher rigidity than the upper case 2 and the lower case 3 may be adopted as the material of the holding plate 5. Since the material of the upper case 2 and the lower case 3 can be different from the material of the support portion 59, the degree of freedom in design and the cost can be reduced.

(Modification 4)
In the above-described embodiment, the example in which the upper case 2 that is a housing member that covers the upper side of the power storage module 4 is formed in a bottomed box shape has been described, but the present invention is not limited to this. Instead of the upper case 2, a rectangular flat plate upper lid may be employed as a housing member that covers the upper side of the power storage module 4. In this case, the side plate of the lower case 3 (the front wall portion 21, the rear wall portion 22, the right wall portion 25, and the left wall portion 26) has a longer vertical dimension than that of the above-described embodiment. That is, the height direction dimension of the lower case 3 becomes the height direction dimension of the housing 10.

(Modification 5)
In the above-described embodiment, the example in which the upper case 2 and the lower case 3 are fastened by the bolt Bb and the nut Nb has been described, but the present invention is not limited to this. For example, the upper case 2 and the lower case 3 may be joined by spot welding. When the upper flange 20 and the lower flange 30 are welded all around, the seal member 60 can be omitted. However, since the maintainability is improved by using a fastening member such as a bolt and a nut, it is preferable to connect the upper case 2 and the lower case 3 with the fastening member.

(Modification 6)
Although the lithium ion battery has been described as an example of the storage element 9, the present invention can be applied to other secondary batteries such as a nickel metal hydride battery. Furthermore, the present invention can be applied to a power storage module using an electric double layer capacitor or a lithium ion capacitor as a power storage element.

(Modification 7)
In the above-described embodiment, an example in which the present invention is applied to an electric vehicle has been described, but the present invention is not limited to this. The present invention can also be applied to a power storage device constituting a power supply device for vehicles of other electric vehicles, for example, railway vehicles such as hybrid trains, passenger cars such as buses, trucks such as trucks, and industrial vehicles such as battery-type forklift trucks. . Further, the present invention is not limited to a vehicle, and the present invention can be applied to various power storage devices mounted on a machine that generates vibration.

  Although various embodiments and modifications have been described above, the present invention is not limited to these contents. Other embodiments conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention.

1 power storage device, 2 upper case, 3 lower case, 4 power storage module, 5 holding plate, 5B holding plate, 6 SD switch, 9 power storage element, 10 housing, 20 upper flange, 21 front wall portion, 22 rear wall portion , 23 Busbar, 25 Right wall part, 26 Left wall part, 27 Step part, 29 Top plate, 30 Lower flange, 31 Front wall part, 32 Rear wall part, 33 Partition wall, 33a Contact part, 35 Right wall part, 36 left wall portion, 39 bottom portion, 50 holding flange, 50a first bolt insertion hole, 50b second bolt insertion hole, 51 front plate, 52 rear plate, 55 vehicle fixing portion, 59 support portion, 60 seal member, 80 two layers Overlap part, 81 3 layer overlap part, 90 mounting bracket, Ba bolt, Bb bolt, Nb nut, WP spot welded part, 101 storage chamber, 102 storage chamber

Claims (8)

A housing that houses a power storage element and includes a first housing member and a second housing member;
A holding member provided with a support portion that supports the bottom portion of the second casing member,
The flange of the first housing member, the flange of the second housing member, and the flange of the holding member are coupled at an overlapping portion,
A power storage device in which a flange that is supported on both ends is provided on a flange of the holding member. The power storage device according to claim 1,
The power storage device, wherein the holding member is thicker than the first housing member and the second housing member. The power storage device according to claim 1,
The power storage device, wherein a material of the first casing member and a second casing member is different from a material of the holding member. The power storage device according to claim 3,
The power storage device, wherein a material of the first casing member and the second casing member is a resin, and a material of the holding member is a metal. The power storage device according to claim 1,
The fixing part of the holding member is a power storage device provided at a portion where the flange of the holding member and the flange of the second casing member overlap. The power storage device according to claim 1,
The fixing part of the holding member is a power storage device provided in the overlapping part. The power storage device according to any one of claims 1 to 6,
A seal member is provided between the first housing member and the second housing member,
The flange of the said 1st housing member, the flange of the said 2nd housing member, and the flange of the said holding member are the electrical storage apparatuses clamped together with the volt | bolt by the said overlap part. The power storage device according to claim 7,
Each of the first casing member and the second casing member is a box-like body having one surface opened,
The flange of the first housing member is formed along an opening edge of the first housing member,
The flange of the second casing member is formed along an opening edge of the second casing member,
The power storage device, wherein the overlapping portion is provided between a bottom portion of the first casing member that is the box-shaped body and a bottom portion of the second casing member that is the box-shaped body.

Images