JP6096714B2 - Power storage device - Google Patents

Description

  The present invention relates to a power storage device that includes a storage battery group in which a plurality of storage batteries are stacked, end plates are disposed at both ends of the storage battery group in the stacking direction, and the end plates are connected to each other by a plurality of connection bands.

  Generally, a power storage device including a storage battery group (battery module) in which a plurality of storage batteries (battery cells) are stacked is known. Since this power storage device is mounted on, for example, a hybrid vehicle or an electric vehicle, it is necessary to mount a large number of storage batteries firmly and securely on the vehicle.

  For example, the battery system disclosed in Patent Document 1 includes a battery block in which battery cells including a plurality of rectangular batteries are stacked with an insulating separator interposed therebetween, and the battery block is fixed by a fixing component. Has been. The fixed component includes a pair of end plates disposed on both end surfaces of the battery cell, and a metal band on the side surface of the battery block and connecting the both ends to the end plate.

  Schematically, as shown in FIG. 9, in the battery block 1, a plurality of battery cells 2 are stacked, and end plates 3 are disposed at both ends in the stacking direction. Both ends of the metal band 4 are bent and brought into contact with the pair of end plates 3, and the both ends are fixed to the pair of end plates 3 via screws 5.

JP 2010-157450 A

  By the way, especially when a high capacity secondary battery is used as the battery cell 2, the battery cell 2 may expand. For this reason, the high reaction force of the battery cell 2 acts on the end plate 3, and there exists a possibility that the said end plate 3 may deform | transform large (refer the dashed-two dotted line in FIG. 9). Therefore, in order to avoid damage to the end plate 3 and the metal band 4, for example, it is conceivable to increase the thickness of the end plate 3 to increase the rigidity.

  However, when the end plate 3 becomes considerably thick, the entire battery system becomes large in the stacking direction. Thereby, there exists a problem that it cannot accommodate effectively in the limited space of an electric vehicle, for example for vehicle-mounted use.

  The present invention solves this type of problem, can reliably receive the reaction force of the storage battery group, can shorten the dimension in the stacking direction as much as possible, and can effectively reduce the size. It is an object of the present invention to provide a possible power storage device.

A power storage device according to the present invention includes a storage battery group in which a plurality of storage batteries are stacked, end plates provided at both ends of the storage battery group in a stacking direction, and a plurality of connection bands that connect the end plates. . Each end of the plurality of connecting bands covers the end of the end plate, extends on the end plate, and is opposed to each other at a position in contact with or close to each other. The end plate and the plurality of connecting bands are formed of sheet metal. In this case, the end plate is provided with a first reinforcing plate made of sheet metal on a surface overlapping with the plurality of connecting bands, while the plurality of connecting bands are provided with a second reinforcing plate made of sheet metal on the surface overlapping with the end plate. Yes.

  Further, in this power storage device, a virtual center line passing through an intermediate position in one side direction of the end plate and parallel to the other side direction intersecting the one side direction of the end plate is set, and each end portion of the plurality of connecting bands is It is preferable that they are arranged to face each other along the virtual center line.

  Furthermore, in this power storage device, the first reinforcement plate is provided with the first bead portion toward the second reinforcement plate, while the second reinforcement plate has the second bead toward the first reinforcement plate. It is preferable that a part is provided. In that case, it is preferable that a 1st bead part and a 2nd bead part are arrange | positioned at zigzag form, and mutually overlap.

  In addition, a fixing portion for attaching the power storage device to the attachment site is provided between one end in one side direction of the end plate and the inside of the plurality of connecting bands, and a fixing bolt is inserted into the fixing portion. It is preferable that a hole is formed.

  According to the present invention, the end portions of the plurality of connecting bands that connect the end plates extend over the end plates so as to cover the end plates, and are opposed to each other at positions that are in contact with or close to each other. ing. For this reason, each edge part of a some connection band can receive the reaction force of a storage battery group, and it becomes possible to suppress that a high reaction force acts on an end plate. Therefore, the thickness of the end plate can be effectively reduced, and the size of the power storage device in the stacking direction can be shortened as much as possible, so that the entire power storage device can be reduced in size. .

1 is a schematic perspective explanatory view of a power storage device according to a first embodiment of the present invention. It is a principal part disassembled perspective explanatory drawing of the said electrical storage apparatus. It is the III-III sectional view taken on the line of the said electrical storage apparatus in FIG. It is the IV-IV sectional view taken on the line of the said electrical storage apparatus in FIG. It is a partial perspective explanatory view of a connecting band constituting the power storage device. It is a partial perspective explanatory view of a power storage device according to a second embodiment of the present invention. It is a partial perspective explanatory view of a power storage device according to a third embodiment of the present invention. It is a partial perspective explanatory view of a power storage device according to a fourth embodiment of the present invention. 1 is a schematic explanatory diagram of a battery system disclosed in Patent Document 1. FIG.

  As shown in FIG.1 and FIG.2, the electrical storage apparatus 10 which concerns on the 1st Embodiment of this invention is mounted in electric vehicles, such as a hybrid vehicle which is not shown in figure, or EV.

  The power storage device 10 includes a storage battery group (battery module) 12M in which a plurality of storage batteries (battery cells) 12 are stacked in the horizontal direction (arrow A direction). The storage battery 12 has a rectangular shape, and is stacked in the direction of arrow A alternately with an insulating separator (holder) 14 in a state of being placed in a standing posture.

  As shown in FIG. 2, rectangular end plates 18a and 18b are interposed at both ends in the stacking direction of the storage battery group 12M via insulator plates (or separators 14) 16a and 16b having a heat insulating function and an insulating function. Be placed. The end plates 18a and 18b are connected to each other by a pair of connecting bands 20a and 20b that are disposed at both ends in the arrow B direction and extend in the arrow A direction (see FIGS. 1 and 2).

  The storage battery 12 consists of a lithium ion battery, for example, and has a rectangle (or square). On the upper surface of each storage battery 12, a positive (or negative) terminal 21a and a negative (or positive) terminal 21b are provided.

  As shown in FIG. 2, the separator 14 is formed in a wave shape along the vertical direction in a side view by bending the resin thin plate into a wave shape. The insulator plates 16a and 16b are configured in a substantially flat plate shape (may be the same as the separator 14), and detailed description thereof is omitted.

  As shown in FIGS. 2 and 3, the end plate 18a is formed of a horizontally long sheet metal (metal plate), and bent portions 22a and 22a that bend outward in the horizontal direction from the vertical direction are provided at both upper and lower ends. It is done. A first reinforcing plate 24a made of sheet metal is fixed, for example, welded to the outer surface 18a of the end plate 18a (surface overlapping the pair of connecting bands 20a and 20b).

  The first reinforcing plate 24a has a cross-sectional wave shape along the vertical direction, and a plurality of (for example, three) first bead portions (projections) 26a protruding in the horizontal direction are provided in parallel to each other in the vertical direction. It is done. The dimension h1 between the first bead parts 26a is set to be equal to the width dimension (vertical dimension) h2 of the first bead part 26a (see FIG. 3). A screw hole 28a is formed in a flat surface at the tip of each first bead portion 26a at a position spaced apart at equal intervals from the center portion in the width direction (arrow B direction).

  The end plate 18b is configured similarly to the end plate 18a. The same components are denoted by the same reference numerals with b instead of a, and detailed description thereof is omitted.

  As shown in FIGS. 1 and 2, the connecting band 20a is formed of a horizontally long sheet metal (metal plate), and bent portions 30a and 30a that bend inward in the horizontal direction from the vertical direction are provided at both upper and lower ends. It is done. The bent portions 30a and 30a extend in the stacking direction of the storage battery group 12M and hold one of the upper and lower corners of the storage battery group 12M.

  The end portions 32a and 32a in the longitudinal direction (long side direction) of the connecting band 20a cover the short sides of the end plates 18a and 18b and extend in the long side direction of the end plates 18a and 18b. As shown in FIGS. 1 and 4, a virtual center line O passing through the intermediate position in the long side direction of the end plate 18a and parallel to the short side direction of the end plate 18a is set. The end 32a of the connecting band 20a terminates along the virtual center line O, that is, at a position on or close to the virtual center line O in a front view of the end plate 18a. Similarly, on the end plate 18b side, the end portion 32a terminates on the virtual center line O or at a position close to the virtual center line O.

  As shown in FIGS. 3 and 5, a second reinforcing plate 34a made of sheet metal is fixed, for example, welded to a surface (inner surface) 32as that overlaps the end plate 18a of the end portion 32a. The second reinforcing plate 34a has a cross-sectional wave shape along the vertical direction, and a plurality of (for example, two) second bead portions (projections) 36a protruding in the horizontal direction are provided in parallel to each other in the vertical direction. It is done. As shown in FIG. 3, the second bead part 36a and the first bead part 26a of the end plate 18a are arranged in a staggered manner, and the second bead part 36a is arranged between the first bead parts 26a. Overlap each other.

  A plurality of hole portions 38a are integrally formed in the end portion 32a and the second reinforcing plate 34a so as to be positioned between the second bead portions 36a and in the vicinity of the tip portion of the end portion 32a. Each hole 38a is arranged coaxially with each screw hole 28a of the first reinforcing plate 24a. The screw 40a is inserted into the hole 38a and screwed into the screw hole 28a, whereby the end 32a of the connecting band 20a and the end plate 18a are fixed.

  A boss member (fixed portion) 42a is provided between one end in the longitudinal direction (one short side) of the end plate 18a and a bent portion of the end portion 32a of the connecting band 20a. The boss member 42a is fixed to the inner surface of the connecting band 20a by welding or the like. The boss member 42a has a columnar shape, and a hole 44a is formed through the vertical direction. As shown in FIGS. 3 and 4, a fixing bolt 46a is inserted into the hole 44a. The fixing bolt 46a is screwed into a portion to be attached, for example, the vehicle body side mounting portion 48a, whereby the power storage device 10 is fixed to the vehicle body side mounting portion 48a.

  The connection band 20b is configured in the same manner as the connection band 20a described above, and the same components are denoted by reference sign b instead of reference sign a, and detailed description thereof is omitted. As shown in FIGS. 1 and 4, the end portion 32b of the connecting band 20b is located along or close to the virtual center line O, that is, on the line of the virtual center line O in the front view of the end plate 18a. Terminate. The end portion 32a of the connection band 20a and the end portion 32b of the connection band 20b are arranged to face each other, that is, along the virtual center line O, in opposition to each other.

  The operation of power storage device 10 configured as described above will be described below.

  As shown in FIGS. 1 and 4, the end portions 32a and 32b of the pair of connecting bands 20a and 20b cover the short sides of the end plates 18a and 18b and extend in the long side direction of the end plates 18a and 18b. doing. In the end plate 18a, the end portion 32a of the connection band 20a and the end portion 32b of the connection band 20b are arranged to face each other, that is, along the virtual center line O, in opposition to each other.

  For this reason, each end part 32a, 32b of a pair of connecting bands 20a, 20b can receive the reaction force of the storage battery group 12M acting in the stacking direction, and the high reaction force acts on the end plates 18a, 18b. It becomes possible to suppress. This is because the end portions 32a and 32b of the connection bands 20a and 20b have a function as an end plate.

  Therefore, the end plates 18a and 18b can be effectively set to have a small thickness, and the dimensions of the power storage device 10 in the stacking direction can be shortened as much as possible. Thereby, the effect that the electrical storage apparatus 10 whole can be reduced in size favorable is acquired.

  Furthermore, in the first embodiment, the end plates 18a and 18b and the pair of connecting bands 20a and 20b are formed of sheet metal. For this reason, for example, compared with a casting component, size reduction and weight reduction can be achieved easily, and desired strength can be obtained reliably.

  In addition, the first reinforcement plate 24a of the end plate 18a is provided with a first bead portion 26a, and the second reinforcement plate 34a of the connection band 20a is provided with a second bead portion 36a. The first bead part 26a and the second bead part 36a are arranged in a staggered manner and overlap each other. Therefore, the strength of the first reinforcing plate 24a and the second reinforcing plate 34a can be further improved, and an increase in size in the stacking direction can be reliably suppressed.

  Furthermore, a boss member 42a is provided between one end of the end plate 18a in the longitudinal direction and a bent portion of the end portion 32a of the connecting band 20a. The power storage device 10 is fixed to the vehicle body side mounting portion 48a by inserting the fixing bolt 46a into the hole portion 44a provided in the boss member 42a. Thereby, the attachment structure of the electrical storage apparatus 10 is arrange | positioned inside the connection bands 20a and 20b, and the said electrical storage apparatus 10 does not enlarge.

  FIG. 6 is a partial perspective explanatory view of a power storage device 60 according to the second embodiment of the present invention. Note that the same components as those of the power storage device 10 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Similarly, in the third and subsequent embodiments described below, detailed description thereof is omitted.

  The power storage device 60 includes a pair of connection bands 62a and 62b. End portions 64a and 64a in the longitudinal direction (long side direction) of the coupling band 62a cover the short sides of the end plates 18a and 18b and extend in the long side direction of the end plates 18a and 18b. The end portion 64a of the connection band 62a ends with respect to the virtual center line O at a position separated in one (or the other) in the arrow B direction.

  The end portion 64b of the connection band 62b terminates at a position separated from the virtual center line O in the other direction (or one direction) in the direction of arrow B. The end portion 64a of the connection band 62a and the end portion 64b of the connection band 62b are arranged to face each other, that is, along a line that is separated from the virtual center line O in the arrow B direction.

  As shown in FIG. 7, the power storage device 70 according to the third embodiment of the present invention includes a pair of connecting bands 72a and 72b. Each end 74a, 74a in the longitudinal direction (long side direction) of the connection band 72a covers the short side of the end plates 18a, 18b and extends in the long side direction of the end plates 18a, 18b. The end portion 74a of the connection band 72a is inclined with respect to the vertical direction, and ends with intersecting the virtual center line O.

  The end 74b of the connection band 72b has a tip inclined along the end 74a of the connection band 72a with respect to the vertical direction, and ends with crossing the virtual center line O. The end portion 74a of the connection band 72a and the end portion 74b of the connection band 72b are arranged to face each other at a position in contact with or close to each other.

  As shown in FIG. 8, a power storage device 80 according to the fourth embodiment of the present invention includes a pair of connection bands 82a and 82b. Ends 84a and 84a in the longitudinal direction (long side direction) of the connecting band 82a cover the short sides of the end plates 18a and 18b and extend in the long side direction of the end plates 18a and 18b. The end portion 84a of the connecting band 82a extends beyond the virtual center line O in the direction of arrow B and terminates.

  The end 84b of the connection band 82b ends with the tip overlapping the end 84a of the connection band 82a. The end portion 84a of the connecting band 82a and the end portion 84b of the connecting band 82b overlap each other, and are screwed along the virtual center line O, for example, integrally through three and one row of screws 40. Fixed.

  In the second to fourth embodiments configured as described above, the end plates 18a and 18b can be effectively set to have a small thickness, and the entire power storage devices 60, 70, and 80 can be downsized satisfactorily. Thus, the same effects as those of the first embodiment can be obtained. Furthermore, the fourth embodiment has an advantage that the end portions 84a and 84b can be integrally fixed by the three screws 40, and the number of the screws 40 can be halved.

  In each of the above embodiments, a rectangular end plate is used and the short side is covered with the connecting band. However, the long side may be covered with the connecting band. Further, a square end plate may be used instead of the rectangular end plate. Furthermore, it is sufficient that the number of connecting bands is plural, and three or more connecting bands may be provided.

DESCRIPTION OF SYMBOLS 10, 60, 70, 80 ... Power storage device 12 ... Storage battery 12M ... Storage battery group 14 ... Separator 18a, 18b ... End plate 20a, 20b, 62a, 62b, 72a, 72b, 82a, 82b ... Connection band 22a, 22b, 30a, 30b ... bent portions 24a, 24b, 34a, 34b ... reinforcing plates 26a, 26b, 36a, 36b ... bead portions 32a, 32b, 64a, 64b, 74a, 74b, 84a, 84b ... end portions 38a, 38b, 44a, 44b ... Holes 42a, 42b ... boss members 46a, 46b ... fixing bolts 48a ... vehicle body side attachment portions

Claims (4)

A storage battery group in which a plurality of storage batteries are stacked;
End plates provided at both ends of the storage battery group in the stacking direction;
A plurality of connecting bands for connecting the end plates;
A power storage device comprising:
Each of the end portions of the plurality of connecting bands covers the end portion of the end plate, extends on the end plate, and is opposed to each other at a position in contact with or close to each other .
The end plate and the plurality of connecting bands are formed of sheet metal,
The end plate is provided with a first reinforcing plate made of sheet metal on a surface overlapping the plurality of connecting bands,
The plurality of the connection band, a power storage device according to claim Rukoto provided a second reinforcing plate made of sheet metal on the surface overlapping the end plate. The power storage device according to claim 1, wherein a virtual center line that passes through an intermediate position in one side direction of the end plate and is parallel to the other side direction that intersects the one side direction of the end plate;
Each of the end portions of the plurality of connection bands is disposed to face each other along the virtual center line. The power storage device according to claim 1 or 2 , wherein the first reinforcement plate is provided with a first bead portion toward the second reinforcement plate,
The second reinforcing plate is provided with a second bead portion toward the first reinforcing plate,
The power storage device, wherein the first bead part and the second bead part are arranged in a staggered manner and overlap each other. The electric storage device according to any one of claims 1 to 3 between the inside of the end plate of one side direction end and the plurality of connection bands, fixed for attaching the electrical storage device to the attachment sites Part is provided,
The power storage device according to claim 1, wherein a hole portion through which a fixing bolt is inserted is formed in the fixing portion.

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