JP2016091871A - Power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow for compaction effectively by shortening the dimension in the lamination direction as much as possible, while receiving reaction of a storage battery group reliably.SOLUTION: In a power storage device 10, end plates 18a, 18b are arranged at the opposite ends of a storage battery group 12M. The end plates 18a, 18b are coupled by means of a pair of coupling bands 20a, 20b, and the end plates 18a, 18b and coupling bands 20a, 20b are formed of a sheet metal. The end plate 18a is provided with a first back-up plate 24a made of a sheet metal, and the coupling band 20a is provided with a second back-up plate 34a made of a sheet metal.SELECTED DRAWING: Figure 2

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. 14, 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. 14). 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. . The end plate and the plurality of connecting bands are made 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, while the plurality of connecting bands are provided with a second reinforcing plate made of sheet metal on the surface overlapping the end plate. .

  Further, 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 is provided with the second bead portion toward the first reinforcement plate. Is preferably 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.

  Furthermore, this power storage device preferably includes a fixing portion that fixes the first reinforcing plate and the second reinforcing plate. In that case, the fixing portion is provided in a range from the vicinity of the center of the other side of the end plate that intersects one side where the plurality of connecting bands are arranged to the position that is farthest from the side of the one side and can be fixed. It is preferred that

  Furthermore, in this power storage device, each end portion of the plurality of connecting bands covers the end portion of the end plate, extends in the plane of the end plate, and is arranged to face each other at a position in contact with or close to each other. preferable.

  According to the present invention, the end plate is provided with the first reinforcing plate made of sheet metal on the surface overlapping the plurality of connecting bands, while the plurality of connecting bands are the second reinforcing plate made of sheet metal on the surface overlapping the end plate. Is provided. For this reason, the rigidity is improved by overlapping the first reinforcing plate and the second reinforcing plate. Therefore, for example, the size and weight can be easily reduced as compared with a cast part, and a desired strength can be obtained with certainty.

  As a result, the end plate can be effectively set to have a small thickness, and the dimensions of the power storage device in the stacking direction can be shortened as much as possible, and the entire power storage device can be reduced in size. Become.

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. It is a schematic perspective explanatory view of a power storage device according to a fifth embodiment of the present invention. It is a principal part disassembled perspective explanatory drawing of the said electrical storage apparatus. FIG. 10 is a cross-sectional explanatory view of the power storage device taken along line XI-XI in FIG. 9. It is principal part disassembled perspective explanatory drawing of the electrical storage apparatus which concerns on the 6th Embodiment of this invention. It is a cross-sectional explanatory drawing of a part of the power storage device. 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). As shown in FIG. 2, a screw hole 28a that constitutes the fixing portion 27a is formed on the flat end surface of each first bead portion 26a at a position spaced from the center portion in the width direction (arrow B direction) at equal intervals on both sides. Is done.

  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 (one side) of the end plates 18a and 18b and extend in the long side (other side) direction of the end plates 18a and 18b. Exists. 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 connection band 20a terminates along the virtual center line O, that is, at a position (in-plane) on the virtual center line O or close to the line in the 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 a position (in-plane) close to the line.

  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. The fixing portion 27a is configured by the screw 40a, the hole 38a, and the screw hole 28a. The fixing portion 27a is set in the vicinity of the center of the long side (other side) intersecting the short side (one side) where the coupling bands 20a and 20b are arranged on the end plate 18a.

  A boss member 42a is provided between one end in the longitudinal direction 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.

  In the power storage device 10 configured as described above, the end plates 18a and 18b and the pair of connection bands 20a and 20b are formed of sheet metal. The end plates 18a and 18b are provided with first reinforcing plates 24a and 24b made of sheet metal, while the connecting bands 20a and 20b are provided with second reinforcing plates 34a and 34b made of sheet metal.

  For this reason, the rigidity can be easily improved by overlapping the first reinforcing plates 24a and 24b and the second reinforcing plates 34a and 34b. At that time, since the first reinforcing plates 24a and 24b and the second reinforcing plates 34a and 34b are fixed via the fixing portions 27a and 27b, the rigidity can be further improved. Therefore, for example, it is possible to easily achieve a reduction in size and weight as compared with a cast part and to obtain a desired strength with certainty.

  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. As a result, 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, 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 the long sides of the end plates 18a and 18b. It extends to. In the end plates 18a and 18b, the end portion 32a of the connection band 20a and the end portion 32b of the connection band 20b are disposed 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 whole electrical storage apparatus 10 can be reduced in size favorably.

  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 (or one) direction in the arrow B direction. 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.

  As shown in FIGS. 9 and 10, the power storage device 90 according to the fifth embodiment of the present invention includes a pair of connection bands 92 a and 92 b. The end portions 94a and 94b in the longitudinal direction (long side direction) of the coupling bands 92a and 92b are arranged so as to cover the short sides of the end plates 18a and 18b. The end portions 94a and 94b of the coupling bands 92a and 92b are configured to be short and terminate at positions spaced outward from the virtual center line O in the direction of arrow B.

  For example, the second reinforcing plates 34a and 34b are welded to the end portions 94a and 94b. The second reinforcing plates 34a and 34b protrude from the end portions 94a and 94b and extend to the position of the virtual center line O of the end plates 18a and 18b or a position close to the line.

  As shown in FIGS. 10 and 11, the flat surface of the tip of the first bead portion 26a of the first reinforcing plate 24a has a screw hole that constitutes the fixing portion 27a at a position close to both ends in the width direction (arrow B direction). 28a is formed. A hole 38a is formed coaxially with the screw hole 28a in the end portion 94a and the second reinforcing plate 34a, and a fixing portion 27a is configured.

  The fixing portion 27a is set on the end side of the short side (one side) of the end plate 18a where the coupling bands 92a and 92b are disposed. More preferably, as shown by a two-dot chain line in FIG. 11, the fixing portion 27a is located farthest from the end portion of the short side (one side) where the coupling bands 92a and 92b are arranged and to a position where it can be fixed. Can be set to a range.

  In the fifth embodiment, the end plates 18a and 18b can be effectively set to have a small thickness, and the dimensions in the stacking direction of the power storage device 90 can be shortened as much as possible. The same effect as the first embodiment is obtained.

  As illustrated in FIGS. 12 and 13, the power storage device 100 according to the sixth embodiment of the present invention includes a pair of connection bands 92 a and 92 b as in the fifth embodiment. For example, second reinforcing plates 34as and 34bs are welded to the end portions 94a and 94b in the longitudinal direction (long side direction) of the coupling bands 92a and 92b. The second reinforcing plates 34as and 34bs are configured to be short in the direction of arrow B and terminate in the vicinity of the end portions 94a and 94b.

  In the sixth embodiment, the second reinforcing plates 34as and 34bs are terminated in the vicinity of the end portions 94a and 94b, so that both strength optimization and weight reduction can be achieved, and the first embodiment described above. The same effect as above can be obtained.

  In the present invention, as shown in the first and sixth embodiments, the fixing portion 27a has a long side (other side) that intersects a short side (one side) on which the connection bands 20a and 20b of the end plate 18a are arranged. It is preferable to be provided in the range from the vicinity of the center to the position that is the farthest and fixable on the end side of the short side (one side).

  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.

10, 60, 70, 80, 90, 100 ... power storage device 12 ... storage battery 12M ... storage battery group 14 ... separator 18a, 18b ... end plate 20a, 20b, 62a, 62b, 72a, 72b, 82a, 82b, 92a, 92b ... Connecting bands 22a, 30a, 30b ... bent portions 24a, 24b, 34a, 34as, 34b, 34bs ... reinforcing plates 26a, 26b, 36a, 36b ... bead portions 27a, 27b ... fixed portions 32a, 32b, 64a, 64b, 74a, 74b, 84a, 84b, 94a, 94b ... Ends 38a, 38b, 44a, 44b ... Holes 42a, 42b ... Boss members 46a, 46b ... Fixing bolts 48a ... Car body side mounting parts

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:
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 connecting bands are provided with a sheet metal second reinforcing plate on a surface overlapping the end plate. The power storage device according to claim 1, 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 power storage device according to claim 1 or 2, further comprising a fixing portion that fixes the first reinforcing plate and the second reinforcing plate,
The fixing portion is provided in a range from the vicinity of the center of the other side of the end plate that intersects the one side where the plurality of connecting bands are arranged to a position that is the most spaced and fixable to the end side of the one side. A power storage device.   4. The power storage device according to claim 1, wherein each end portion of the plurality of connection bands extends in a plane of the end plate so as to cover an end portion of the end plate and contact each other. Alternatively, the power storage device is disposed so as to face each other at a close position.

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