JP2019135687A - Power storage module - Google Patents

Abstract

To provide a power storage module capable of appropriately fixing a position of a flexible printed circuit board in relative to a power storage cell and suppressing cost of manufacture.SOLUTION: A power storage module comprises: multiple power storage cells 11 each of which includes a safety valve 11c and which are arrayed; a smoke exhaust duct 5 extending in an array direction D of the multiple power storage cells 11 and covering the safety valves 11c; and a flexible printed circuit board 6 extending in the array direction D and including wiring electrically connected to the power storage cells 11. The smoke exhaust duct 5 includes a projection 57 protruding from a surface of the smoke exhaust duct 5, and the flexible printed circuit board 6 includes engage part 67 with which the projection 57 is engaged, and is disposed on the surface of the smoke exhaust duct 5 in a state where the projection 57 is engaged to the engage part 67.SELECTED DRAWING: Figure 1

Description

  One aspect of the present invention relates to a power storage module.

  A power storage module including a flexible printed board connected to a plurality of power storage cells arranged is known. For example, in the power storage module described in Patent Document 1, the flexible printed circuit board is supported by the support member placed on the upper surface of the power storage cell.

JP2013-80620A

  In a power storage module including a flexible printed board, the positional relationship between the power storage cell and the flexible printed board needs to be appropriately fixed. However, if a dedicated component is used to position the flexible printed circuit board, it may be difficult to reduce the manufacturing cost.

  An object of one aspect of the present invention is to provide a power storage module that can appropriately fix the position of a power storage cell with a flexible printed circuit board and that can suppress manufacturing costs.

  The power storage module according to one aspect of the present invention has a safety valve, a plurality of power storage cells arranged, a smoke exhaust duct extending in the arrangement direction of the plurality of power storage cells, and covering the safety valve, and extending in the arrangement direction. And a flexible printed circuit board including a wiring electrically connected to the storage cell, wherein the smoke exhaust duct includes a protrusion protruding from the surface of the smoke exhaust duct, and the flexible printed circuit board is associated with the protrusion. It has an engaging part to be combined, and is disposed on the surface of the smoke exhaust duct in a state where the protrusion is engaged with the engaging part.

  According to the power storage module, the position of the flexible printed circuit board can be easily fixed along the smoke exhaust duct by engaging the protrusion of the smoke exhaust duct with the engaging part formed on the flexible printed circuit board. . Further, by forming the protrusion on the surface of the smoke exhaust duct, a dedicated component for fixing the flexible printed circuit board to the storage cell is not required. Thereby, it can suppress that manufacturing cost becomes high.

  The flexible printed circuit board includes a main body portion along the smoke exhaust duct and a branch portion branched from the main body portion, and the main body portion includes a first cut line extending in the width direction of the flexible printed circuit board intersecting the arrangement direction. A notch-like portion defined by a second notch line extending in the arrangement direction continuously to the first notch line is formed, and the branch portion is formed by the first notch line and the second notch line. The engaging portion may be located next to the cutout portion in the main body portion. In this configuration, it is possible to prevent the main body from being distorted by forming the engaging portion next to the notched portion where stress is likely to concentrate.

  The engaging part may be located next to the first cut line in the arrangement direction of the notch-shaped part. In this configuration, it is easy to avoid the wiring of the flexible printed board and form the engaging portion.

  An engaging part may be located next to the arrangement | positioning direction of the edge part on the opposite side to the 1st notch line in an arrangement direction among notch-shaped parts. In this configuration, since the end opposite to the first cut line is the base end of the branch portion, it is possible to effectively suppress the position of the branch portion from being shifted in the arrangement direction.

  The cutout portion includes a first cutout portion formed on one side in the width direction of the main body portion and a second cutout portion formed on the other side in the width direction. The first cutout portion and the first cutout portion The two notch portions may be formed at positions that do not overlap each other in the arrangement direction. In this configuration, the width of the main body can be reduced.

  According to one aspect of the present invention, a power storage module having a low height can be provided.

It is a top view which shows typically the electrical storage module which concerns on one Embodiment. It is sectional drawing which shows a part of battery module typically. It is a perspective view which shows a part of electrical storage module typically. It is a perspective view which shows typically a part of electrical storage module which concerns on other embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same reference numerals are used for the same or equivalent elements, and redundant descriptions are omitted. In the drawing, an XYZ orthogonal coordinate system is shown.

[First Embodiment]
FIG. 1 is a plan view schematically showing a power storage module according to an embodiment. FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1 and schematically shows a part of the battery module. FIG. 3 is a perspective view schematically showing a part of the power storage module. As shown in FIG. 1, the power storage module 1 can include an array 2, an elastic member 3, a restraining member 4, a smoke exhaust duct 5, and a flexible printed board 6.

  The power storage module 1 is used as a battery for various vehicles such as forklifts, hybrid vehicles, and electric vehicles. The power storage module 1 is a nonaqueous electrolyte secondary battery such as a lithium ion secondary battery, but may be an electric double layer capacitor.

  The array body 2 includes a plurality (seven in this embodiment) of storage cells 11 arranged. Each power storage cell 11 is a unit cell in which an electrode assembly is accommodated in a rectangular box-like case, for example. The plurality of power storage cells 11 are arranged in the arrangement direction D (Y direction). Each power storage cell 11 may be held by a resin cell holder. A positive electrode terminal 11 a and a negative electrode terminal 11 b are provided on the upper surface (front surface) 11 d of the storage cell 11 so as to be separated from each other. The positive electrode terminal 11a is an electrode terminal connected to the positive electrode of the electrode assembly, and the negative electrode terminal 11b is an electrode terminal connected to the negative electrode of the electrode assembly. The adjacent storage cells 11 are arranged so that the positive electrode terminal 11 a and the negative electrode terminal 11 b are adjacent to each other, and the adjacent positive electrode terminal 11 a and the negative electrode terminal 11 b are electrically connected to each other by the bus bar 12. Thereby, the adjacent electrical storage cells 11 are electrically connected in series. The positive electrode terminal 11a and the negative electrode terminal 11b may be connected to the bus bar 12 by bolts, or may be connected to the bus bar 12 by welding. In the arrangement direction D of the storage cells 11, an external connection terminal 13 that is a plate-like conductive member, for example, is connected to the negative electrode terminal 11b of the storage cell 11 at one end and the positive terminal 11a of the storage cell 11 at the other end. .

  Each power storage cell 11 has a safety valve 11c. The safety valve 11c is provided on the upper surface 11d of the storage cell 11, for example. The safety valve 11c releases the gas to the outside when the gas pressure in the storage cell 11 exceeds a predetermined value. Safety valve 11c is arranged between positive electrode terminal 11a and negative electrode terminal 11b on upper surface 11d of power storage cell 11. Therefore, the plurality of safety valves 11 c are arranged along the arrangement direction D.

  The elastic member 3 is disposed at one end of the array body 2 in the array direction D of the storage cells 11. The elastic member 3 is a member used for the purpose of preventing the storage cell 11 from being damaged by a restraining load, and is made of, for example, a urethane rubber sponge. The elastic member 3 is a rectangular plate member. Examples of the material of the elastic member 3 include ethylene propylene diene rubber (EPDM), chloroprene rubber, and silicon rubber. The elastic member 3 is not limited to rubber, and may be a spring material or the like. The elastic members 3 may be disposed at both ends of the array 2 in the array direction D, or may be disposed between the storage cells 11 and 11 adjacent to each other.

  The restraining member 4 is a member for applying a restraining load to the array body 2 in the array direction D. The restraining member 4 includes a pair of end plates 41 and a plurality of connecting members 42. The pair of end plates 41 are members for sandwiching the array 2 from both sides in the array direction D. The end plate 41 is a plate-like member made of a metal material such as iron.

  The connecting member 42 connects the pair of end plates 41 to each other. The connecting member 42 is constituted by a bolt and a nut made of a metal such as iron. The bolts of the connecting members 42 are sequentially inserted through the insertion holes of one end plate 41, the insertion holes of the cell holders, and the insertion holes of the other end plate 41, and are fastened by nuts outside the other end plate 41. Yes. By this fastening, a restraining load is applied to the array body 2 in the array direction D.

  The smoke exhaust duct 5 extends in the arrangement direction D of the plurality of storage cells 11 and covers the plurality of safety valves 11c. The smoke exhaust duct 5 can be disposed between the positive terminal 11a and the negative terminal 11b. For example, the smoke exhaust duct 5 may be fixed to a cell holder or the like. The smoke exhaust duct 5 is a resin member, for example. The smoke exhaust duct 5 includes a side plate 51, a side plate 52, and an upper plate 53 extending between the side plate 51 and the side plate 52. The upper plate 53 is disposed to face the safety valve 11c. The gas released from the safety valve 11 c is discharged to the outside through an internal space surrounded by the side plates 51 and 52 and the upper plate 53 of the smoke exhaust duct 5 and the upper surface 11 d of the storage cell 11.

  Further, as shown in FIG. 3, the smoke exhaust duct 5 has a plate-like leg portion 54 that spreads outward from the lower end of the side plate 51, and a plate-like leg portion 55 that spreads outward from the lower end of the side plate 52. Yes. Leg portions 54 and 55 extend in a direction intersecting with side plates 51 and 52, respectively, and are placed on upper surface 11 d of power storage cell 11. The internal space in the cross section (cross section in FIG. 3) of the smoke exhaust duct 5 orthogonal to the arrangement direction D is, for example, a rectangular shape, but a trapezoid whose width increases from the upper plate 53 toward the upper surface 11d of the storage cell 11. It may be.

  The flexible printed circuit board 6 has a plurality of wirings sandwiched between a plurality of insulating films. The flexible printed circuit board 6 of the present embodiment is a single-sided board on which a chip is mounted on one side. In the following description, a surface on which a chip is mounted may be referred to as a mounting surface. The flexible printed circuit board 6 is provided along the smoke exhaust duct 5. Each wiring is along the extending direction of the flexible printed circuit board 6. The flexible printed circuit board 6 can be electrically connected to the bus bar 12, for example.

  The base end of the flexible printed circuit board 6 is connected to the connector 101 of the monitoring device 100. The wiring of the flexible printed circuit board 6 that is electrically connected to the bus bar 12 transmits a signal related to the voltage of the storage cell 11 to the monitoring device 100. The monitoring device 100 is located outside the end plate 41 located at one end in the arrangement direction D. The monitoring device 100 includes a monitoring circuit 103 that monitors the voltage of the storage cell 11 and a power supply circuit 104 that supplies power to the monitoring circuit 103. The monitoring circuit 103 is connected to the connector 101 by a plurality of wirings 101a. The monitoring device 100 can be composed of a printed wiring board and components (for example, semiconductor chips) mounted on the printed wiring board.

  A cover 7 that covers the array body 2 is provided on the upper plate 53 of the smoke exhaust duct 5 (see FIG. 2). In addition, illustration of the cover 7 is abbreviate | omitted in FIG. The cover 7 has, for example, a rectangular shape in plan view, and can include an upper plate 71 and a side plate 73 formed on the periphery of the upper plate 71. A pressing piece 75 can be provided on the inner surface of the upper plate 71. The pressing piece 75 is provided, for example, at the center in the width direction intersecting the arrangement direction D. The pressing piece 75 can press the flexible printed circuit board 6 disposed on the upper plate 53 of the smoke exhaust duct 5 toward the upper plate 53 side. The pressing piece 75 is formed of an elastic member such as a rubber material or sponge, for example.

  Next, the structure of the smoke exhaust duct 5 and the flexible printed circuit board 6, particularly the structure of fixing the flexible printed circuit board 6 to the smoke exhaust duct 5 will be described in more detail.

  As shown in FIGS. 1 and 3, a protrusion 57 protruding from the upper surface is formed on the upper surface of the upper plate 53 of the smoke exhaust duct 5. The protrusion 57 has a height larger than the thickness of the flexible printed circuit board 6 and has, for example, a cylindrical shape. A plurality (three in the example of FIG. 1) of the protrusions 57 are arranged on the upper plate 53 at positions spaced from each other in the arrangement direction D.

  The flexible printed circuit board 6 includes a main body portion 61 fixed on the upper plate 53 and a plurality of branch portions 64 branched from the main body portion 61. In this embodiment, the flexible printed circuit board 6 may be formed from a rectangular substrate having the arrangement direction D as a longitudinal direction (long side direction). In this case, the branch portion 64 can be formed by making a cut line in the substrate. In the illustrated example, a first cut line 64a that enters inside from an edge in the width direction (short side direction) of the substrate, and a second cut line 64b that extends in the arrangement direction D from the tip of the first cut line 64a, The branch part 64 is formed by the above. Thereby, the branch part 64 in which the end part (base end 64 c) on the monitoring device 100 side (base end side) is connected to the main body part 61 is formed. The main body 61 is formed with a notched portion 66 defined by the first cut line 64a and the second cut line 64b (see FIG. 3). In this case, the shape of the branching portion 64 is a rectangular shape corresponding to the shape of the notched portion 66.

  In the present embodiment, in the main body portion 61, notched portions 66 are formed on both one side and the other side in the X direction. In the example of FIG. 1, two notch portions 66 (first notch portions) are formed on the right side toward the paper surface, and one notch portion 66 (second notch portion) is formed on the left side. Yes. The two notch portions 66 formed on the right side and the one notch portion 66 formed on the left side are formed at positions that do not overlap with each other in the arrangement direction D.

  The main body portion 61 is a film portion extending along the upper plate 53. The branch portion 64 is connected to the bus bar 12 or the like by, for example, rivet connection, welding or solder connection. In the example shown in FIG. 1, an example is shown in which the branch portions 64 are connected only to some bus bars 12 and the external connection terminals 13, but the branch portions 64 are connected to all the bus bars 12 and the external connection terminals 13. It may be connected.

  A plurality of fuses 8 can be mounted on the main body 61. Each fuse 8 is connected to each wiring exposed at the portion where the fuse 8 is mounted in the main body 61. The fuse 8 is disposed, for example, in the vicinity of the base end 64 c of the branch portion 64, and is connected to a wiring formed in the branch portion 64.

  The branch part 64 of the flexible printed circuit board 6 has, for example, a bent part 64d in which a part of the branch part 64 is bent into a mountain fold. In the illustrated example, the bent portion 64 d is formed in the vicinity of the base end 64 c of the branch portion 64. Further, the branching portion 64 has a folded portion 64e where the branching portion 64 is folded. The folded portion 64e is formed closer to the tip than the bent portion 64d. In the folded portion 64e, the branching portion 64 is folded at an angle of, for example, 90 degrees so that the tip side faces the outer side in the width direction than the folded portion 64e. In the branch part 64, the tip side of the folded part 64e can extend outward toward the bus bar 12 with the mounting surface facing downward. In addition, the position of the branch part 64 can be finely adjusted in the arrangement direction D by forming the bent part 64d.

  Further, the flexible printed circuit board 6 has an engaging portion 67 with which the protruding portion 57 of the smoke exhaust duct 5 is engaged. The engaging portion 67 is configured by a through hole formed in the flexible printed circuit board 6. The through hole is, for example, circular, and has a diameter that is approximately the same as the outer diameter of the protrusion 57. In the present embodiment, the engaging portion 67 is formed in the main body portion 61 of the flexible printed board 6. Further, the engaging portion 67 is located next to the notched portion 66 in the arrangement direction D. That is, the engaging portion 67 is located in the range in which the width of the notched portion 66 is formed in the width direction (X direction). Further, in the arrangement direction D, the engaging portion 67 is located next to the first cut line 64 a in the notched portion 66. The distance from the first cut line 64a to the engaging portion 67 is shorter than, for example, half the length of the notched portion 66 in the arrangement direction D. For example, the distance may be equal to or less than the width (length in the X direction) of the notched portion 66.

  In the power storage module described above, the flexible printed circuit board 6 is disposed on the surface of the smoke exhaust duct 5 (on the upper surface of the upper plate 53) with the protrusion 57 engaged with the engaging portion 67. Therefore, the position of the flexible printed circuit board 6 can be easily fixed along the smoke exhaust duct 5. In addition, since the protrusion 57 is formed on the surface of the smoke exhaust duct 5, a dedicated component for fixing the flexible printed circuit board 6 to the storage cell 11 is not required. Thereby, it can suppress that manufacturing cost becomes high.

  In the main body 61 of the flexible printed circuit board 6, a first cut line 64 a extending in the width direction formed between the main body 61 and the branch portion 64 and the first cut line 64 a are extended in the arrangement direction. A notched portion 66 is formed which is defined by the second cut line 64b. The engaging portion 67 is located next to the arrangement direction D of the notched portions 66 in the main body portion 61. In this configuration, it is possible to prevent the main body 61 from being distorted by forming the engaging portion 67 next to the notched portion 66 where stress tends to concentrate.

  The wiring formed on the flexible printed circuit board 6 terminates at the tip of the branch portion 64, and electrically connects the monitoring device 100 and the bus bar 12 and the like. Therefore, a space for wiring is not necessary on the first cut line 64a side of the notched portion 66. In the present embodiment, since the engaging portion 67 is located next to the first cut line 64a in the notched portion 66, it is easy to form the engaging portion 67 while avoiding wiring of the flexible printed circuit board 6.

  The notch portion 66 includes a notch portion 66 formed on one side in the width direction (X direction) and a notch portion 66 formed on the other side in the width direction. These notch portions 66 are formed at positions that do not overlap each other in the arrangement direction D. In this configuration, the width of the main body 61 can be made narrower than when two or more cutout portions are formed at overlapping positions in the arrangement direction D. In particular, when the width of the notched portion 66 (that is, the width of the branch portion 64) is larger than the interval (minimum interval) between wires formed in the main body portion 61, the main body portion on the monitoring device 100 side where the wires are densely packed. The width of 61 can be narrowed. Manufacturing cost can be suppressed by narrowing the width of the main body.

[Second Embodiment]
In the power storage module according to the present embodiment, the position of the engaging portion formed on the flexible printed circuit board is different from that of the power storage module of the first embodiment. In the following, differences from the first embodiment will be mainly described. The basic configuration of the power storage module is the same as that of the first embodiment shown in FIG.

  FIG. 4 is a perspective view schematically showing a part of the power storage module. As shown in FIG. 4, the engaging portion 167 is located next to the notched portion 66 in the arrangement direction D. Further, the engaging portion 167 is located next to the end portion on the opposite side to the first cut line in the arrangement direction D in the notched portion 66. That is, the engaging portion 167 is positioned next to the base end 64 c in the arrangement direction D. The distance from the base end 64c to the engaging portion 167 is shorter than, for example, half of the length of the notched portion 66 in the arrangement direction D. For example, the distance may be equal to or less than the width of the notched portion 66.

  In the present embodiment, when the fuse 8 is disposed in the wiring toward the branching portion 64, the engaging portion 167 may be formed in a region between the fuse 8 and the branching portion 64, or the engaging portion 167. The fuse 8 may be arranged in a region between the branch portion 64 and the branch portion 64.

  In the present embodiment, the engaging portion 167 is located next to the base end 64 c of the branching portion 64. Therefore, it is possible to effectively suppress the shift of the position of the branching portion 64 in the arrangement direction D. Further, by suppressing the position shift of the branching portion 64, it is possible to suppress stress from being concentrated on the base end 64c of the branching portion 64.

  As mentioned above, although preferred embodiment of this invention was described in detail, this invention is not limited to the said embodiment. For example, the flexible printed circuit board may be bonded with an adhesive or the like while being positioned in the smoke exhaust duct. Moreover, the flexible printed circuit board may be provided with both the engaging part 67 of 1st Embodiment and the engaging part 167 of 2nd Embodiment. Moreover, although the single-sided type flexible printed circuit board is illustrated, the flexible printed circuit board may be a double-sided type in which both surfaces are mounting surfaces.

  DESCRIPTION OF SYMBOLS 1 ... Power storage module, 5 ... Smoke duct, 6 ... Flexible printed circuit board, 11 ... Power storage cell, 11c ... Safety valve, 57 ... Projection part, 67 ... Engagement part, D ... Arrangement direction.

Claims (5)

A plurality of storage cells each having a safety valve and arranged;
A smoke exhaust duct extending in the direction of arrangement of the plurality of storage cells and covering the safety valve;
A flexible printed circuit board including a wiring extending in the arrangement direction and electrically connected to the storage cell,
The flue gas duct includes a protrusion protruding from the surface of the flue gas duct,
The flexible printed circuit board has an engaging portion with which the protruding portion is engaged, and is disposed on the surface of the smoke exhaust duct in a state where the protruding portion is engaged with the engaging portion. , Power storage module. The flexible printed circuit board includes a main body portion along a smoke exhaust duct, and a branch portion branched from the main body portion,
The main body portion is defined by a first cut line extending in the width direction of the flexible printed circuit board intersecting with the arrangement direction and a second cut line extending in the arrangement direction continuously to the first cut line. A notch-shaped part is formed,
The branch portion is formed by the first cut line and the second cut line,
The power storage module according to claim 1, wherein the engaging portion is located next to the notch portion in the main body portion.   3. The power storage module according to claim 2, wherein the engaging portion is located in the main body portion adjacent to the first cut line of the notch-shaped portion in the arrangement direction.   4. The power storage according to claim 2, wherein the engaging portion is located next to the arrangement direction of an end portion of the main body portion opposite to the first notch line side of the notch-shaped portion. module. The cutout portion includes a first cutout portion formed on one side in the width direction of the main body portion, and a second cutout portion formed on the other side in the width direction,
5. The power storage module according to claim 2, wherein the first cutout portion and the second cutout portion are formed at positions that do not overlap each other in the arrangement direction.

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