JP6657590B2 - Power storage device holder and power storage device module - Google Patents

Description

  The present invention relates to a power storage device holder and a power storage device module.

  As a conventional power storage device module, a secondary battery module including a plurality of secondary batteries and a plurality of cell holders respectively holding the plurality of secondary batteries is known (for example, see Patent Document 1). The cell holder is formed by integrally molding a heat conductive rubber layer on one surface of a metal plate-shaped member. A cooling medium flow path through which a cooling medium such as air for cooling the secondary battery that has generated heat due to overcharging or the like flows is provided on a surface of the heat conductive rubber layer that contacts the secondary battery.

JP 2014-10939 A

  In the above-described cell holder (power storage device holder), it is required to improve the heat dissipation of the battery (power storage device).

  An object of the present invention is to provide a power storage device holder and a power storage device module that can improve heat dissipation of a power storage device.

  A power storage device holder according to one aspect of the present invention is a power storage device holder that holds a power storage device, including a bottom wall portion facing a bottom surface of the power storage device, and a pair of side wall portions facing both side surfaces of the power storage device. , A back wall portion facing the back surface of the power storage device, and the back wall portion has a plurality of ribs extending in a direction facing the pair of side wall portions and defining a first air flow path through which air flows. The bottom wall has a plurality of protruding portions defining a second air flow path on which the power storage device is mounted and through which the air flows.

  In this power storage device holder, the back and bottom surfaces of the power storage device are cooled by flowing air through the first air flow path and the second air flow path. That is, not only the back surface of the power storage device is cooled as in the conventional power storage device holder, but also the bottom surface of the power storage device is cooled. Thus, heat dissipation of the power storage device can be improved.

  Further, the protruding portions may be provided at both ends of the bottom wall, and the second air flow path may be disposed between the protruding portions provided at both ends of the bottom wall. This makes it possible to improve the heat dissipation of the central portion of the bottom surface of the power storage device, which tends to increase in temperature due to overcharging of the power storage device or the like.

  Further, the second air passage may extend in a direction orthogonal to the extending direction of the first air passage. Thus, heat dissipation of the power storage device can be improved with a simple configuration.

  Further, the plurality of second air passages are arranged along the extending direction of the first air passage, and the width of the second air passage is from one side to the other in the extending direction of the first air passage. It may be wider toward the side. When air flows from one side to the other side in the extending direction of the first air flow path, the temperature of the air may increase from one side to the other side in the extending direction. However, in this case, since the width of the second air flow path increases from one side to the other side in the extending direction of the first air flow path, the flow rate of air flowing through each second air flow path is reduced. It increases from one side to the other side in the extending direction of the first air flow path. As a result, it is possible to suppress variations in the heat dissipation of the power storage device in the extending direction.

  Further, the first air flow path and the second air flow path may communicate with each other. Thereby, since air flows through both the first air flow path and the second air flow path, the air stays in the flow path for a long time. As a result, the air can be sufficiently used for cooling the power storage device.

  Further, the second air flow path may extend in a direction in which the first air flow path extends. Thus, heat dissipation of the power storage device can be improved with a simple configuration.

  Further, the second air flow path may have a wavy shape. A region where the wavy second air flow path and the bottom surface of the power storage device face is wider than a region where the straight second air flow path and the bottom surface of the power storage device face. Therefore, the heat dissipation of the power storage device can be further improved.

  A power storage device module according to one aspect of the present invention includes a plurality of power storage devices and a plurality of the power storage device holders respectively holding the plurality of power storage devices.

  Since the power storage device module includes the power storage device holder, heat dissipation of the power storage device can be improved.

  According to the present invention, heat dissipation of a power storage device can be improved.

It is a schematic diagram showing a battery module as a power storage device module according to the first embodiment. FIG. 2 is a front view showing a battery and a cell holder provided in the battery module shown in FIG. 1. FIG. 3 is a perspective view illustrating a cell holder illustrated in FIG. 2. FIG. 3 is a side view illustrating the cell holder illustrated in FIG. 2. It is a perspective view showing a cell holder provided in a battery module as a power storage device module according to a second embodiment. It is a perspective view which shows the modification of a cell holder shown in FIG. It is a perspective view showing the cell holder provided in the battery module as an electric storage module concerning a 3rd embodiment. It is a perspective view showing a cell holder provided in a battery module as a power storage device module according to a fourth embodiment. FIG. 9 is a perspective view showing a modification of the cell holder shown in FIG. 8.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or equivalent elements have the same reference characters allotted, and overlapping description will be omitted.

[First Embodiment]
FIG. 1 is a schematic diagram illustrating a battery module as an embodiment of a power storage device module. As shown in FIG. 1, the battery module (power storage device module) 1 includes an array 2, end plates (restriction members) 3 and 3 for applying a restraining load to the array 2, an array 2 and an end. An elastic body 4 interposed between the plate 3 and the elastic member 4.

  The array 2 has a plurality (here, seven) of batteries (power storage devices) 10 and a plurality (here, seven) of cell holders (power storage device holders) 5 that hold the respective batteries 10. .

  The battery 10 is, for example, a lithium ion secondary battery. As shown in FIG. 2, the battery 10 includes a hollow case 11 having, for example, a substantially rectangular parallelepiped shape, and an electrode assembly (not shown) housed in the case 11. The case 11 is formed of a metal such as aluminum, for example. The case 11 has a pair of front surfaces 12a and a rear surface 12b facing in the arrangement direction of the array body 2 (the direction of penetrating the drawing in FIG. 2), and a pair of top surfaces facing the short side direction of the rear surface 12b (vertical direction in FIG. 2). 13a, a bottom surface 13b, and a pair of side surfaces 14a and 14b opposed to each other in the longitudinal direction (the left-right direction in FIG. 2) of the back surface 12b.

  For example, an organic solvent-based or non-aqueous electrolyte is injected into the case 11. On the top surface 13a of the case 11, a positive electrode terminal 15 and a negative electrode terminal 16 are arranged separately from each other. The electrode assembly includes, for example, a positive electrode, a negative electrode, and a bag-shaped separator disposed between the positive electrode and the negative electrode. In the electrode assembly, the positive electrode and the negative electrode are alternately stacked along the arrangement direction of the array 2 via the separator in a state where the positive electrode is accommodated in the separator.

  The cell holder 5 is integrally formed of a resin material such as polypropylene. The cell holder 5 is located around the case 11 as shown in FIG.

  The end plate 3 applies a constraint load to the array 2 in the direction in which the batteries 10 are arranged. The end plate 3 is, for example, a metal plate member. As shown in FIG. 1, the end plate 3 has, for example, an area larger than an area when the batteries 10 are viewed from the arrangement direction. The end plates 3 are arranged at both ends in the arrangement direction of the array body 2 and the elastic bodies 4, respectively, with the outer edge portions protruding outside the battery 10. A plurality of bolts 6 are inserted into the outer edges of the end plates 3. By screwing nuts 7 from the outside of the end plate 3 to the tips of the bolts 6, the battery 10 and the elastic body 4 are sandwiched by the end plates 3, 3 to form a unit, and the end plates 3, 3 A constraint load is applied.

  The elastic body 4 is a member used for the purpose of preventing the battery 10 and the end plate 3 from being damaged by the restraining load when the battery 10 expands. As shown in FIG. 1, the elastic body 4 is formed in a rectangular plate shape by, for example, a rubber sponge made of urethane, and is disposed between the battery 10 and the end plate 3 on one end side in the arrangement direction. The thickness of the elastic body 4 is equal to or greater than the thickness of the end plate 3. Examples of a material for forming the elastic body 4 include ethylene propylene diene rubber (EPDM), chloroprene rubber, and silicone rubber.

  Next, the cell holder 5 will be described in more detail.

  As shown in FIG. 3, the cell holder 5 includes a back wall portion 20 facing the back surface 12 b of the battery 10, a bottom wall portion 30 facing the bottom surface 13 b of the case 11, and both side surfaces 14 a and 14 b of the battery 10. A pair of side walls 40, 40, and a top wall 50 facing the top surface 13 a of the case 11 are provided.

  The back wall portion 20 includes a rectangular back plate 21, a plurality of (here, nine) first ribs (ribs) 22 having a rectangular parallelepiped shape (a rectangular cross section) extending in the longitudinal direction of the back plate 21, have. The length of the first rib 22 in the extending direction is substantially the same as the length of the back plate 21 in the longitudinal direction. Each first rib 22 is arranged on one surface 21 a of the back plate 21. The first ribs 22 are arranged substantially in parallel with each other along the short direction of the back plate 21 at intervals substantially equal to the width of the first ribs 22. The interval between one of the first ribs 22 (the lower first rib 22 in FIG. 3) at which the array end is located and one end in the lateral direction of the back plate 21 (the lower end in FIG. 3) is adjacent. The distance between the first ribs 22 is wider than the distance between the first ribs 22.

  The bottom wall portion 30 has a rectangular plate-shaped concave portion 31 whose both ends in the longitudinal direction are bent, and a pair of rectangular parallelepiped support portions 32, 32 that support both ends of the concave portion 31. The support portion 32 has a protruding portion 32a protruding toward the opposite side (the first rib 22 side) of the concave portion 31 and a leg portion 32b protruding toward the concave direction of the concave portion 31. That is, the protruding portion 32a and the leg portion 32b are provided at both ends of the bottom wall portion 30. The tip surface of the protruding portion 32a is a mounting surface 32c on which the bottom surface 13b of the case 11 is mounted. The leg portion 32b is provided with a through hole 32d extending in the lateral direction of the bottom wall portion 30. The bolt 6 described above is inserted into the through hole 32d.

  The bottom wall 30 is disposed at one end of the back plate 21 in the short direction (the lower end in FIG. 3). The short direction of the bottom wall portion 30 is oriented in a direction orthogonal to the surface direction of the one surface 21 a of the back plate 21. The bottom wall 30 is connected to one end of the back plate 21 in the short direction by one end of the bottom wall 30 in the short direction.

  The side wall portion 40 has a rectangular plate shape. The length of the side wall portion 40 in the short direction is substantially the same as the length of the bottom wall portion 30 in the short direction. The side wall 40 has an opening 41 formed by cutting one end of the side wall 40 in the short direction into a rectangular shape. The opening 41 extends along the longitudinal direction of the side wall 40.

  Each of the side wall portions 40 is disposed at each end of the back plate 21 in the longitudinal direction. The lateral direction of the side wall portion 40 is oriented in a direction orthogonal to the surface direction of the one surface 21 a of the back plate 21. Each of the side wall portions 40, 40 is connected to each of the longitudinal end portions of the back plate 21 by one end portion of each of the side wall portions 40, 40 in the short direction. Each of the side wall portions 40, 40 is connected to each of the support portions 32, 32 by one end (the lower end in FIG. 3) of each of the side wall portions 40, 40 in the longitudinal direction. The openings 41 face each other in the longitudinal direction of the back plate 21. The edge of the opening 41 in the extending direction is located near the first rib 22 located at the arrangement end.

  The top wall portion 50 has a pair of terminal accommodating portions 51, 51 and a pair of pillar portions 52, 52. The terminal accommodating portion 51 has a rectangular flat plate shape. The terminal accommodating portion 51 is formed with a cutout portion 51a in which one end of the terminal accommodating portion 51 in the short direction is cut out in a semicircular shape. The positive terminal 15 and the negative terminal 16 of the battery 10 are located in the notch 51a. The pillar 52 has a pillar shape. The pillar 52 is arranged at one end (inner end) in the longitudinal direction of the terminal accommodating portion 51. The pillar portion 52 is provided with a through hole 52 a extending in the short direction of the terminal accommodating portion 51. The bolt 6 described above is inserted into the through hole 52a.

  The top wall 50 is arranged at the other end in the short direction of the back plate 21 (the upper end in FIG. 3). The short direction of the terminal accommodating portion 51 is orthogonal to the surface direction of the one surface 21 a of the back plate 21. The top wall 50 is connected to the other end (the upper end in FIG. 3) of the back plate 21 in the short direction by one end of the top wall 50 in the short direction of the terminal accommodating portion 51. The other longitudinal ends of the terminal accommodating portions 51, 51 are connected to the longitudinal other ends (upper ends in FIG. 3) of the side walls 40, 40, respectively.

  Battery 10 is fitted into cell holder 5. The back surface 12b of the case 11 is in contact with the tip of the first rib 22, as shown in FIG. For this reason, the first air passage R1 is formed by the space defined by the back surface 12b of the case 11, the first rib 22 of the back wall 20, and the back plate 21. The first air flow path R1 extends in a direction in which the pair of side walls 40, 40 are opposed to each other. Therefore, the air that has flowed in from one opening 41 (the left opening 41 in FIG. 3) passes through each first air flow path R1 and passes through the other opening 41 (the right opening 41 in FIG. 3). leak. The first air flow path R <b> 1 is used as a flow path through which, for example, cooled air flows, and contributes to cooling of the battery 10.

  On the other hand, between the protruding portions 32a of the bottom wall 30, a second air flow path R2 is arranged as shown in FIG. More specifically, the bottom surface 13b of the case 11 is mounted on the mounting surface 32c of the protruding portion 32a. For this reason, the second air flow path R2 is formed by the space defined by the bottom surface 13b of the case 11, the concave portion 31 of the bottom wall portion 30, and the protruding portions 32a, 32a. The second air passage R2 is used as a passage through which, for example, cooled air flows, and contributes to cooling of the battery 10. The air flows into one end of the second air flow path R2 (the back side in the paper surface direction of FIG. 2) through each opening 41. The air that has passed through the second air flow path R2 flows out from the other end of the second air flow path R2 (the front side in the paper surface direction of FIG. 2).

  As described above, in the present embodiment, the back surface 12b and the bottom surface 13b of the battery 10 are cooled by flowing air through the first air passage R1 and the second air passage R2. That is, not only the back surface 12b of the battery 10 is cooled as in the conventional cell holder, but also the bottom surface 13b of the battery 10 is cooled. Thereby, the heat radiation of the battery 10 can be improved.

  Further, in the present embodiment, the protruding portions 32 a are provided at both ends of the bottom wall portion 30. The second air flow path R2 is disposed between the protruding portions 32a. This makes it possible to improve the heat radiation of the central portion of the bottom surface 13b of the battery 10 that tends to increase in temperature due to overcharging or the like of the battery 10.

[Second embodiment]
This embodiment is different from the first embodiment in the configuration of the bottom wall of the cell holder 5.

  The cell holder 5 includes a bottom wall 230 as shown in FIG. The bottom wall portion 230 has a rectangular bottom plate 231 and a plurality of (19 in this case) second ribs (projecting portions) 232. The second rib 232 has a rectangular parallelepiped shape (rectangular cross section) extending in the lateral direction of the bottom wall 230. The second rib 232 is arranged on one surface 231 a of the bottom plate 231. Each of the second ribs 232 is arranged substantially in parallel with the width of the second rib 232 along the extending direction of the first air flow path R1. For this reason, a plurality of (here, 18) second air flow paths R2 are formed by the space defined by the bottom surface 13b of the case 11, the bottom plate 231 of the bottom wall 230, and each of the second ribs 232. Each second air flow path R2 extends in a direction orthogonal to the direction in which the first air flow path R1 extends. The air that has flowed in from each of the openings 41 flows into one end of the second air flow path R2 (the back side in the paper surface direction of FIG. 2). The air that has passed through the second air flow path R2 flows out from the other end of the second air flow path R2 (the front side in the paper surface direction of FIG. 2). Thus, in the present embodiment, the heat radiation of the battery 10 can be improved with a simple configuration. In addition, the 2nd air flow path R2 does not need to be arrange | positioned plurally, What is necessary is just to arrange at least one or more.

  Further, as shown in FIG. 6, the width of the second air flow path R2 may increase from one side to the other side in the extending direction of the first air flow path R1. When the air flows from one side to the other side in the extending direction of the first air flow path R1 through each of the openings 41, 41, the temperature of the air increases from one side to the other side in the extending direction. Can rise. However, in this case, since the width of the second air flow path R2 increases from one side to the other side in the extending direction of the first air flow path R1, the width of each second air flow path R2 is increased. The flow rate of the flowing air increases from one side in the extending direction of the first air flow path R1 to the other side. As a result, it is possible to suppress variations in the heat dissipation of the battery 10 in the extending direction.

[Third embodiment]
This embodiment is different from the first embodiment in the configuration of the back wall and the bottom wall of the cell holder 5.

  As shown in FIG. 7, the cell holder 5 includes a back wall 320 and a bottom wall 330. The back wall portion 320 includes a rectangular back plate 321, a plurality of (here, nine) first ribs 322, and a plurality of (here, eight) third ribs 323. The first rib 322 has a rectangular parallelepiped shape (rectangular cross section) extending in the longitudinal direction of the back plate 321. Each of the first ribs 322 has a different length in the extending direction. Each first rib 322 is arranged on one surface 321 a of the back plate 321. The first ribs 322 are arranged such that the longer first ribs 322 are located from the bottom wall 330 toward the top wall 50. Each of the first ribs 322 is arranged substantially in parallel with an interval substantially equal to the width of the first rib 322. One end of each first rib 322 is aligned with one end in the longitudinal direction of the back plate 321 (the left end in FIG. 7). Thus, a plurality of first air flow paths R1 having different lengths are formed by the space defined by the back surface 12b of the case 11, the first rib 322 of the back wall 320, and the back plate 321. The first air flow path R1 extends in a direction in which the pair of side walls 40, 40 are opposed to each other.

  Each third rib 323 has a rectangular parallelepiped shape (rectangular cross section) extending in the short direction of the back plate 321. Each of the third ribs 323 has a different length in the extending direction. Each third rib 323 is arranged on one surface 321 a of the back plate 321. Each of the third ribs 323 is arranged such that the longer third rib 323 is located from one side wall portion 40 (left side in FIG. 7) toward the other side wall portion 40 side (right side in FIG. 7). Are arranged. The third ribs 323 are arranged substantially in parallel at intervals larger than the width of the third ribs 323. One end of each third rib 323 is aligned with one end (the lower end in FIG. 7) of the back plate 321 in the short direction. Thus, a plurality of third air passages R3 having different lengths are formed by the space defined by the back surface 12b of the case 11, the third rib 323 of the back wall 320, and the back plate 321.

  The other end of each first rib 322 and the other end of each third rib 323 are connected. That is, the first air passage R1 and the third air passage R3 communicate with each other. Thus, a plurality of L-shaped air flow paths are formed on one surface 321a of the back plate 321 in plan view.

  The bottom wall 330 has a rectangular bottom plate 331 and a plurality (eight in this case) of second ribs (projecting portions) 332. The second rib 332 has a rectangular parallelepiped shape (rectangular cross section) extending in the short direction of the bottom wall portion 330. The second rib 332 is arranged on one surface 331 a of the bottom plate 331. The second ribs 332 are arranged substantially in parallel with each other at intervals wider than the width of the second ribs 332 along the extending direction of the first air flow path R1. Therefore, a plurality of second air flow paths R2 are formed by the space defined by the bottom surface 13b of the case 11, the bottom plate 331 of the bottom wall 330, and each of the second ribs 332. Each second air flow path R2 extends in a direction orthogonal to the direction in which the first air flow path R1 extends.

  One end of each second rib 232 (the end on the far side in the paper plane of FIG. 7) is connected to one end of each third rib 323 (the lower end of FIG. 7). That is, the second air passage R2 and the third air passage R3 communicate with each other. Thus, the first air flow path R1 and the second air flow path R2 communicate with each other via the third air flow path R3.

  In the present embodiment, since the air flows through the flow path from the first air flow path R1 to the second air flow path R2, the air stays in the air flow path for a long time. As a result, the air can be sufficiently used for cooling the battery 10.

[Fourth embodiment]
This embodiment is different from the first embodiment in the configuration of the bottom wall and the side wall of the cell holder 5.

  As shown in FIG. 8, the cell holder 5 includes a bottom wall portion 430 and a pair of side wall portions 440, 440. The bottom wall portion 430 has a rectangular bottom plate 431. In the bottom plate 431, one second air passage R2 extending in the extending direction of the first air passage R1 is formed.

  The side wall portion 440 has a rectangular plate shape. An opening 441 is formed in the side wall 440. The opening 441 includes a first opening 441a and a second opening 441b. The first opening portion 441a is formed by cutting one end of the side wall portion 440 in the short direction into a rectangular shape. The first opening portion 441a extends along the longitudinal direction of the side wall portion 440. The second opening 441b extends from one longitudinal end (the end on the bottom wall 430 side) of the first opening 441a toward the other lateral end of the side wall 440. The second air flow path R2 is located in a region surrounded by the peripheral edge of the second opening 441b when viewed from the direction in which the side walls 440, 440 are opposed to each other. Therefore, the air that has flowed in from one second opening 441b passes through the second air flow path R2 and flows out from the other second opening 441b. As described above, in the present embodiment, the heat radiation of the battery 10 can be improved with a simple configuration.

  The present invention is not limited to the above embodiment.

  In the above embodiment, the first air flow path R1, the second air flow path R2, and the third air flow path R3 have a linear shape. However, the air flow paths R1, R2, and R3 are shown in FIG. Like the illustrated second air flow path R2, for example, it may have a wavy shape. In this case, the area where the wavy second air flow path R2 and the bottom surface 13b of the battery 10 face is wider than the area where the linear second air flow path R2 and the bottom face 13b of the battery 10 face. Therefore, the heat radiation of the battery 10 can be further improved. Further, the width of each of the air flow paths R1, R2, R3, the width of the first ribs 22, 322, the width of the second ribs 232, 332, and the width of the third rib 323 may be changed as appropriate.

  In the above embodiment, the air flowing in from one opening 41 (the opening 41 on the left side in FIG. 3) passes through each first air flow path R1 and the other opening 41 (the opening on the right side in FIG. 3). 41), the air may flow in the opposite direction. That is, the air that has flowed in from the other opening 41 may flow out of the one opening 41. Further, the arrangement of the air flow paths R1, R2, R3, the first ribs 22, 322, the second ribs 232, 332, and the third rib 323 may be appropriately changed according to the direction in which the air flows.

  In the embodiment described above, the end plates 3 and 3 are fastened to each other with the bolts 6 and the nuts 7 to apply a restraining load to the array 2 and the elastic body 4. And the like, and both ends of the restraining band may be fastened to the end plates 3 and 3 with bolts or the like to apply a restraining load to the array body 2 and the elastic body 4. Further, the power storage device according to the above embodiment may be applied to a power storage device module in which a constraint load is not applied to the array 2.

  In the above embodiment, the power storage device is a secondary battery such as a lithium ion secondary battery. However, the present invention is not particularly limited to such a secondary battery, and for example, a power storage device such as an electric double layer capacitor or a lithium ion capacitor. The present invention is also applicable to a power storage device module including a device.

  DESCRIPTION OF SYMBOLS 1 ... Battery module (power storage device module), 5 ... cell holder (power storage device holder), 10 ... battery (power storage device), 20, 320 ... back wall part, 30, 330, 430 ... bottom wall part, 40, 440 ... side wall Part, 22, 322: first rib (rib), 32a: projecting portion, 232, 332: second rib (projecting portion), R1: first air flow path, R2: second air flow path.

Claims (4)

A power storage device holder for holding a power storage device,
A bottom wall portion facing the bottom surface of the power storage device;
A pair of side wall portions facing both side surfaces of the power storage device;
A back wall facing the back of the power storage device ;
A top wall portion facing the top surface of the power storage device ,
The back wall portion has a plurality of first ribs extending in a direction opposite to the pair of side wall portions and forming a first air flow path through which air flows.
The bottom wall portion is provided with the power storage device and extends in a direction orthogonal to an extending direction of the first air flow path, and forms a plurality of second air flow paths through which the air flows. Having a second rib ,
A plurality of third air passages extending in a direction orthogonal to the first rib and the second rib so as to connect the first rib and the second rib and connecting the first rib to the second rib; Further comprising a plurality of third ribs forming
The first air flow path and the second air flow path are communicated via the third air flow path,
The length of the first air flow path is increased from the bottom wall side toward the top wall side,
The power storage device holder , wherein a length of the third air flow path increases from one side to the other side in an extending direction of the first air flow path . The second width of the air flow path, the first and from one side of the extending direction of the air flow passage widens toward the other side, the power storage device holder according to claim 1, wherein. The pair of side wall portions are formed by cutting out an end of the side wall portion on the back wall side side so as to extend along a longitudinal direction of the side wall portion, and are formed with respect to the first air flow path. It has an opening for inflow and outflow of the air, according to claim 1 or 2, power storage device holder according. A plurality of power storage devices,
Power storage device module and a plurality of power storage device holder of any one of claims 1 to 3 for holding the plurality of power storage devices, respectively.

Images