Power storage device

Abstract

To provide a power storage device capable of reducing stress applied to an electronic device that monitors a power storage module.SOLUTION: A power storage device includes: a first power storage module and a second power storage module; a case for housing the first power storage module and the second module; a cross member 20; a mount member 30 fixed to an upper surface 20a of the cross member 20; and an electronic device 41. A height of the mount member 30 in a vertical direction is higher than a height of the electronic device 41. The electronic device 41 is disposed so as to be adjacent to the mount member 30 in a second direction, and includes: a first end portion 411 located on the mount member 30 side in the second direction; and a second end portion 412 located on the opposite side to the side where the mount member 30 is located in the second direction. The first end portion 411 is fixed to the mount member 30, and the second end portion 412 is fixed to the cross member 20.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to an electricity storage device. [Background technology]

[0002] As a conventional energy storage device, Japanese Patent No. 6003838 (Patent Document 1) discloses a battery module having a number of unit cells arranged in parallel and a restraining device that integrates the number of unit cells, in which at least one of a battery monitoring ECU that monitors the state of the number of unit cells and a switching element unit equipped with a switching element controlled by the battery monitoring ECU is thermally joined to the restraining device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6003838 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the configuration disclosed in Patent Document 1, when the single cell generates heat and the battery module thermally expands, stress acts on the restraint. In this case, stress is applied to the board of the battery monitoring ECU or the board of the switching element joined to the restraint. Similarly, when the battery module contracts, stress is applied to the board of the battery monitoring ECU or the board of the switching element joined to the restraint. For this reason, there is a concern that the battery monitoring ECU or the switching element may not operate normally.

[0005] The present disclosure has been made in consideration of the above-mentioned problems, and an object of the present disclosure is to provide an energy storage device that can reduce the stress imposed on an electronic device that monitors the energy storage module. [Means for solving the problem]

[0006] The energy storage device according to the present disclosure includes a first energy storage module and a second energy storage module arranged side by side in a first direction perpendicular to a vertical direction, a case for accommodating the first energy storage module and the second energy storage module, a cross member arranged between the first energy storage module and the second energy storage module in the case and extending in a second direction perpendicular to the vertical direction and the first direction, a mount member fixed to an upper surface of the cross member, and an electronic device for monitoring the first energy storage module or the second energy storage module. The height of the mount member in the vertical direction is higher than the height of the electronic device. The electronic device is arranged adjacent to the mount member in the second direction, and includes a first end located on the mount member side in the second direction, and a second end located on the opposite side to the side on which the mount member is located in the second direction. The first end is fixed to the mount member. The second end is fixed to the cross member.

[0007] According to the above configuration, since the electronic device is placed on the cross member arranged between the first energy storage module and the second energy storage module, it is possible to prevent stress due to expansion or contraction of the first energy storage module and the second energy storage module from being transmitted to the electronic device.

[0008] In addition, when stress is applied from above the case, it can be transmitted to the bottom wall of the case via the mount member, which is taller than the electronic device, and the cross member. On the other hand, when stress is applied from below the case, it can be transmitted to the top wall of the case via the cross member and the mount member. Therefore, even when stress is applied to the case in the vertical direction, it is possible to prevent the stress from being transmitted to the electronic device.

[0009] Furthermore, since a first end of the electronic device is fixed to the mounting member and a second end of the electronic device is fixed to the cross member, the input acceleration to the electronic device in response to vibration input when the vehicle is traveling can be suppressed.

[0010] In the power storage device according to the present disclosure, the mount member may include a column portion located on the first end side of the electronic device in the second direction and having a height in the vertical direction greater than that of the electronic device, and an outer end portion provided adjacent to the column portion so as to be located on the first end side of the column portion in the second direction, and to which the first end portion is fixed. In the vertical direction, the height of the outer end portion may be lower than the height of the column portion. A weak portion may be provided at a boundary portion between the outer end portion and the column portion.

[0011] According to the above configuration, by breaking the weak portion, when stress is input to the case in the vertical direction, the stress acting on the column portion can be prevented from being transmitted to the outer end portion.

[0012] In the power storage device according to the present disclosure, the mount member may have a first lower surface portion constituting the lower surface of the column portion and a second lower surface portion constituting the lower surface of the outer end portion. The first lower surface portion may be provided with an insertion portion to be inserted into the cross member. The outer end portion may be provided with a fixed portion on the first end side and lower side to be fixed to a fastening member provided on the cross member. The first lower surface portion abuts against the upper surface of the cross member, and the second lower surface portion is provided so as to be separated upward from the upper surface of the cross member.

[0013] According to the above configuration, the second lower surface portion is disposed between the fastened portion and the insertion portion and spaced apart from the upper surface of the cross member, so that the weak portion can be easily broken. This makes it possible to prevent the stress acting on the column portion from being transmitted to the outer end portion when stress is input to the case in the vertical direction. Effect of the Invention

[0014] According to the present disclosure, it is possible to provide an energy storage device capable of reducing the stress applied to an electronic device that monitors an energy storage module. [Brief description of the drawings]

[0015] [Figure 1] FIG. 2 is an exploded perspective view of a power storage device according to an embodiment. [Diagram 2] 1 is a perspective view showing a schematic configuration of an electricity storage device according to an embodiment; [Diagram 3] 1 is a schematic perspective view showing a fixing structure of an electronic device in an energy storage device according to an embodiment; [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV shown in FIG. [Diagram 5] 11A and 11B are diagrams illustrating a state in which the mounting member according to the embodiment is broken. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the embodiments described below, the same or common parts are denoted by the same reference characters in the drawings, and the description thereof will not be repeated.

[0017] Fig. 1 is an exploded perspective view of a power storage device according to an embodiment. Fig. 2 is a perspective view showing a schematic configuration of a power storage device according to an embodiment. A power storage device 1 according to an embodiment will be described with reference to Figs. 1 and 2.

[0018] As shown in FIGS. 1 and 2, the energy storage device 1 includes a plurality of energy storage modules 10, a plurality of cross members 20, a plurality of mounting members 30, a plurality of electronic devices 41, 42, and a case 200.

[0019] The multiple power storage modules 10 are arranged side by side at intervals in a first direction (DR1 direction) perpendicular to the up-down direction. The multiple power storage modules 10 include, for example, four power storage modules 10, including a first power storage module 10A, a second power storage module 10B, a third power storage module 10C, and a fourth power storage module 10D. The first power storage module 10A, the second power storage module 10B, the third power storage module 10C, and the fourth power storage module 10D are arranged side by side in the first direction in order.

[0020] The number of power storage modules 10 is not limited to four, and may be any number equal to or greater than two. When the power storage device 1 is mounted on a vehicle, the first direction is, for example, parallel to the front-rear direction of the vehicle.

[0021] Each power storage module 10 may include a plurality of power storage stacks 100. In the present embodiment, each power storage module 10 includes two power storage stacks 100. The number of power storage stacks 100 included in the power storage module 10 is not limited to two, and may be one, or may be three or more. The multiple power storage stacks 100 are arranged side by side in the first direction.

[0022] Each of the electricity storage stacks 100 includes a first unit stack 101 , a second unit stack 102 , and an intermediate plate 103 .

[0023] Each of the first unit stack 101 and the second unit stack 102 includes a plurality of storage cells 110 arranged in a vertical direction and a second direction (DR2 direction) perpendicular to the first direction. The storage cells 110 are, for example, secondary batteries such as nickel-metal hydride batteries or lithium-ion batteries. The storage cells 110 have, for example, a rectangular shape. The storage cells 110 may use a liquid electrolyte or a solid electrolyte.

[0024] The first unit stack 101 is disposed on one side in the second direction. The first unit stack 101 may include an end plate. The end plate is disposed on the outside of the storage cell 110 disposed on the outermost side in the second direction.

[0025] The second unit stack 102 is disposed on the other side in the second direction. In the present embodiment, the number of the power storage cells 110 included in the second unit stack 102 is the same as the number of the power storage cells 110 included in the first unit stack 101, but may be different. The second unit stack 102 may include an end plate disposed outside the power storage cells 110 on the other side in the second direction.

[0026] The intermediate plate 103 is disposed between the first unit stack 101 and the second unit stack 102. The intermediate plate 103 is disposed in the center of the electricity storage stack 100 in the second direction. The intermediate plate 103 is made of synthetic resin or the like.

[0027] The case 200 houses the power storage modules 10, the cross members 20, the mounting members 30, and the electronic devices 41, 42. The case 200 has a lower case 210 and an upper case 220. For the sake of convenience, the upper case 220 is omitted in FIG. 2.

[0028] The lower case 210 has a generally box-like shape that opens upward. The lower case 210 is made of metal, synthetic resin, etc. The lower case 210 has a bottom wall 212, a lower peripheral wall portion 214, and a lower flange 216.

[0029] The bottom wall 212 is disposed below the multiple power storage modules 10. A cooler (not shown) that cools the power storage stack 100 via the bottom wall 212 may be provided below the bottom wall 212. In this case, a heat conductive member may be provided between the cooler and the bottom wall 212, or a heat conductive member may be provided between each power storage stack 100 and the bottom wall 212. As the heat conductive member, for example, an adhesive containing a silicone resin, an acrylic resin, or an epoxy resin, grease, or the like can be used.

[0030] The lower peripheral wall portion 214 stands up from the peripheral edge of the bottom wall 212 and surrounds the lower periphery of the multiple electricity storage modules 10. The lower flange 216 has a shape that protrudes outward from the upper end portion of the lower peripheral wall portion 214.

[0031] The upper case 220 has a generally box-like shape that opens downward. The upper case 220, together with the lower case 210, houses a plurality of power storage modules 10. The upper case 220 is made of metal, synthetic resin, or the like. The upper case 220 has a top wall 222, an upper peripheral wall portion 224, and an upper flange 226.

[0032] The top wall 222 is disposed above the multiple power storage stacks 100. The top wall 222 faces the bottom wall 212 in the up-down direction. The top wall 222 may be formed in a flat plate shape. A gap is formed between the top wall 222 and each power storage module 10.

[0033] The upper peripheral wall portion 224 extends downward from the peripheral edge of the top wall 222 and surrounds the upper periphery of the multiple power storage modules 10. The upper peripheral wall portion 224, together with the lower peripheral wall portion 214, constitutes the peripheral wall of the case 200. The lower peripheral wall portion 214 and the upper peripheral wall portion 224 connect the peripheral edge of the bottom wall 212 and the peripheral edge of the top wall 222, and surround the periphery of the multiple power storage stacks 100.

[0034] The upper flange 226 has a shape that protrudes outward from the lower end of the upper peripheral wall portion 224. The upper flange 226 is fixed to the lower flange 216 by bolts or the like.

[0035] Each of the multiple cross members 20 is disposed in a gap between adjacent power storage modules 10 in the first direction. Specifically, a cross member 20 is disposed in each of the gaps between the first power storage module 10A and the second power storage module 10B, the gap between the second power storage module 10B and the third power storage module 10C, and the gap between the third power storage module 10C and the fourth power storage module 10D.

[0036] The cross member 20 is fixed to a bottom wall 212. The bottom wall 212 extends along the second direction. Both ends of the cross member 20 may be connected to the lower peripheral wall portion 214. A cross section of the cross member 20 perpendicular to the second direction is formed into an upwardly convex shape. Specifically, the cross member 20 includes, for example, an upper wall portion constituting an upper surface 20a, and a pair of vertical wall portions extending downward from both sides of the upper wall portion in the first direction. A space may be provided between the upper wall portion and the bottom wall 212. The upper surface 20a is formed to be approximately flat.

[0037] The mount member 30 is fixed to an upper surface 20a (see FIG. 3) of the cross member 20. The mount member 30 has a first pillar portion 31, a second pillar portion 32, a connecting portion 33, a first outer end portion 35, and a second outer end portion 36.

[0038] The first pillar portion 31 and the second pillar portion 32 are located on the cross member 20 and spaced apart in the second direction. The first pillar portion 31 is located on one side in the second direction from the second pillar portion 32. The upper end portion of the first pillar portion 31 and the upper end portion of the second pillar portion 32 may be in contact with the top wall 222 or may be spaced apart from the top wall 222.

[0039] The height of the first pillar portion 31 and the second pillar portion 32 in the vertical direction is greater than the height of each of the connecting portion 33, the first outer end portion 35, and the second outer end portion 36. In addition, the height of the first pillar portion 31 and the second pillar portion 32 in the vertical direction is greater than the height of the electronic devices 41, 42. As a result, the first pillar portion 31 and the second pillar portion 32 transmit a load input downward to the top wall 222 to the cross member 20. Similarly, the first pillar portion 31 and the second pillar portion 32 transmit a load input upward to the bottom wall 212 from the cross member 20 to the top wall 222.

[0040] The connecting portion 33 connects the first pillar portion 31 and the second pillar portion 32. The connecting portion 33 extends along the second direction.

[0041] The first outer end 35 constitutes an end of the mount member 30 on one side in the second direction. The first outer end 35 is provided so as to be located closer to the first end 411 of the electronic device 41 than the first column portion 31 in the second direction. As will be described later, the first end 411 of the electronic device 41 is fixed to the first outer end 35.

[0042] The first outer end portion 35 is provided adjacent to the first pillar portion 31. A first weak portion 37 is provided at the boundary between the first outer end portion 35 and the first pillar portion 31.

[0043] The second outer end 36 constitutes an end of the mount member 30 on the other side in the second direction. The second outer end 36 is provided so as to be located closer to the first end 421 of the electronic device 42 than the second column portion 32 in the second direction. As will be described later, the first end 421 of the electronic device 42 is fixed to the second outer end 36.

[0044] The second outer end portion 36 is provided adjacent to the second columnar portion 32. A second weakened portion 38 is provided at the boundary between the second outer end portion 36 and the second columnar portion 32.

[0045] The electronic device 41 is located on one side in the second direction relative to the mount member 30. The electronic device 41 is disposed so as to be adjacent to the mount member 30 in the second direction. The electronic device 41 is disposed on the mount member 30.

[0046] The electronic device 41 has a first end 411 and a second end 412 in the second direction. The first end 411 is located on the mount member 30 side in the second direction. The second end 412 is located on the opposite side to the side on which the mount member 30 is located in the second direction.

[0047] The electronic device 41 is a monitoring unit that monitors the power storage modules 10. The electronic device 41 monitors at least one of the adjacent power storage modules 10. Specifically, for example, the electronic device 41 located between the first power storage module 10A and the second power storage module 10B monitors at least one of them.

[0048] The electronic device 42 is located on one side in the second direction relative to the mount member 30. The electronic device 42 is disposed so as to be adjacent to the mount member 30 in the second direction. The electronic device 42 is disposed on the mount member 30.

[0049] The electronic device 42 has a first end 421 and a second end 422 in the second direction. The first end 421 is located on the mount member 30 side in the second direction. The second end 422 is located on the opposite side to the side on which the mount member 30 is located in the second direction.

[0050] The electronic device 42 is a monitoring unit that monitors a power storage module 10 different from the electronic device 41. For example, the electronic device 42 located between the first power storage module 10A and the second power storage module 10B monitors the second power storage module 10B when the electronic device 41 monitors the first power storage module 10A.

[0051] 3 is a schematic perspective view showing a fixing structure for electronic equipment in the power storage device according to the embodiment. The fixing structure for electronic equipment 41 will be described with reference to FIG.

[0052] As shown in FIG. 3, a first end 411 of the electronic device 41 is fixed to the mount member 30, and a second end 412 of the electronic device 41 is fixed to the cross member 20.

[0053] Specifically, the first end 411 of the electronic device 41 is fixed to the first outer end 35 by the inner connection member 51. The inner connection member 51 has a shape extending from the first end 411 toward the mount member 30. The end of the inner connection member 51 located on the mount member 30 side is fixed to a bolt 71 protruding from the upper surface of the first outer end 35. The end of the inner connection member 51 located on the electronic device 41 side is fixed to the first end 411 side.

[0054] The second end 412 of the electronic device 41 is fixed to the upper surface 20a of the cross member 20 by the outer connection member 52 on one side in the second direction from the second end 412. The outer connection member 52 has a shape extending from the second end 412 toward one side in the second direction. The end of the outer connection member 52 located on the electronic device 41 side is fixed to the second end 412 side. The end of the outer connection member 52 located on one side in the second direction is fixed to a bolt 72 protruding upward from the upper surface 20a of the cross member 20.

[0055] The electronic device 42 is fixed in the same manner as the electronic device 41. Specifically, a first end 421 of the electronic device 42 is fixed to the second outer end 36 of the mount member 30 by an inner connection member (not shown). A second end 422 of the electronic device 42 is fixed to the upper surface 20a of the cross member 20 on the other side in the second direction from the second end 422 by an outer connection member (not shown).

[0056] As described above, the electronic devices 41, 42 are installed on the cross members 20 arranged between adjacent energy storage modules 10, so that when the energy storage module 10 expands or contracts, the stress caused by the expansion or contraction can be prevented from being transmitted to the electronic devices 41, 42.

[0057] Furthermore, when stress is applied to the case 200 in the vertical direction, the height of the electronic devices 41, 42 is set lower than the height of the mount member 30, so that the stress can be transmitted from the top wall 222 to the bottom wall 212, or from the bottom wall 212 to the top wall 222, via the cross member 20 and the mount member 30. This makes it possible to prevent the stress from being transmitted to the electronic devices 41, 42.

[0058] Furthermore, as described above, in each of the electronic devices 41, 42, one of the ends of the electronic device 41, 42 is fixed to the mounting member 30 and the other end is fixed to the cross member 20, thereby making it possible to suppress the input acceleration to the electronic device 41, 42 in response to vibration input when the vehicle is traveling.

[0059] In addition, even in a situation where it is difficult to fix the end (first end) of the electronic device 41, 42 located on the mounting member 30 side to the cross member 20, the electronic device 41, 42 can be stably fixed by fixing the first end to the mounting member 30.

[0060] A fixed portion 351 is provided on the first outer end portion 35 at a lower portion on the first end portion 411 side (one side in the first direction). The fixed portion 351 is fixed to a bolt 73 provided on the cross member 20 as a fastening member.

[0061] Similarly, a fixed portion is provided on the lower side of the second outer end 36 on the first end 421 side (the other side in the first direction). The flying boat portion is fixed to a bolt provided on the cross member 20 as a fastening member.

[0062] 4 is a cross-sectional view taken along line IV-IV in FIG. 3. As shown in FIG. 4, the mount member 30 has a first lower surface portion 31b constituting the lower surface of the first column portion 31 and a second lower surface portion 35b constituting the lower surface of the first outer end portion 35. The first lower surface portion 31b is provided with an insertion portion 31c that protrudes downward. The insertion portion 31c is inserted into the upper surface 20a of the cross member 20. An insertion portion is also provided on the lower surface of the second column portion 32 on the second column portion 32 side, and the insertion portion is inserted into the upper surface 20a. The first lower surface portion 31b abuts against the upper surface 20a.

[0063] The second lower surface portion 35b is provided so as to move upward away from the upper surface 20a of the cross member 20. Specifically, the second lower surface portion 35b is inclined so as to head upward as it moves away from the first pillar portion 31 in the second direction. The lower surface 351a of the fixed portion 351 is approximately parallel to the upper surface 20a. Similarly, on the second outer end portion 36 side, the lower surface portion (third lower surface portion) of the second outer end portion 36 is inclined so as to head upward as it moves away from the second pillar portion 32.

[0064] The second lower surface portion 35b and the third lower surface portion may be provided so as to have a step portion between them and the first lower surface portion 31b. In this case, the second lower surface portion 35b and the third lower surface portion may be provided substantially parallel to the upper surface 20a.

[0065] 5 is a diagram showing a state in which the mounting member according to the embodiment is broken. As described above, the first weak part 37 is provided at the boundary between the first pillar part 31 and the first outer end part 35. The first weak part 37 is formed by a notch such as a cutout or a notch.

[0066] 5, the first weak portion 37 is provided so as to be breakable when a predetermined load is applied to the mount member 30. When a large stress is applied to the case 200 due to a vehicle collision or the like and the stress is received by the mount member 30, the first weak portion 37 breaks, thereby preventing the stress from being transmitted from the mount member 30 to the electronic device 41. Similarly, the second weak portion 38 breaks, thereby preventing the stress from being transmitted from the mount member 30 to the electronic device 42. As a result, damage to the electronic devices 41, 42 can be suppressed.

[0067] Furthermore, as described above, since the second lower surface portion 35b and the third lower surface portion are arranged to be spaced upward from the upper surface 20a, when stress is input to the mounting member 30, the first weak portion 37 and the second weak portion 38 can be easily broken.

[0068] (Other variations) In the above, an example was given of the case where the first end of the electronic device 41, 42 is indirectly fixed to the mount member 30 via an inner connecting member, but the inner connecting member may be omitted and the first end may be directly fixed to the mount member 30.

[0069] In the above, an example was given of the case where the second end portions of the electronic devices 41, 42 are fixed to the cross member 20 via an outer connecting member, but the outer connecting member may be omitted and the second end portions may be fixed directly to the cross member 20.

[0070] The embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, and includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0071] 1 Energy storage device, 10 Energy storage module, 10A First energy storage module, 10B Second energy storage module, 10C Third energy storage module, 10D Fourth energy storage module, 20 Cross member, 20a Upper surface, 30 Mounting member, 31 First column portion, 31b First lower surface portion, 31c Insertion portion, 32 Second column portion, 33 Connection portion, 35 First outer end portion, 35b Second lower surface portion, 36 Second outer end portion, 37 First weak portion, 38 Second weak portion, 41, 42 Electronic device, 51 Inner connection member, 52 Outer connection member, 71, 72, 73 Bolt, 100 Energy storage stack, 101 First unit stack, 102 Second unit stack, 103 Intermediate plate, 110 Energy storage cell, 200 Case, 210 Lower case, 212 Bottom wall, 212a Raised portion, 214 Lower peripheral wall portion, 216 lower flange, 220 upper case, 222 top wall, 224 upper peripheral wall portion, 226 upper flange, 351 fixed portion, 351a lower surface, 411, 421 first end portion, 412, 422 second end portion.

Claims

1. a first power storage module and a second power storage module arranged side by side in a first direction perpendicular to a vertical direction; a case that accommodates the first power storage module and the second power storage module; a cross member disposed in the case between the first power storage module and the second power storage module and extending in the up-down direction and in a second direction perpendicular to the first direction; a mount member fixed to an upper surface of the cross member; an electronic device that monitors the first power storage module or the second power storage module; a height of the mounting member in the vertical direction is greater than a height of the electronic device; the electronic device is disposed adjacent to the mount member in the second direction, and includes a first end located on the mount member side in the second direction, and a second end located on the opposite side to the mount member side in the second direction, The first end is fixed to the mounting member, The second end is fixed to the cross member.

2. the mount member includes a column portion located on the first end side of the electronic device in the second direction and having a height in the up-down direction greater than that of the electronic device, and an outer end portion provided adjacent to the column portion so as to be located on the first end side of the column portion in the second direction, and to which the first end is fixed; In the vertical direction, the height of the outer end portion is lower than the height of the column portion, The power storage device according to claim 1 , wherein a weakened portion is provided at a boundary between the outer end portion and the column portion.

3. The mounting member has a first lower surface portion constituting a lower surface of the column portion and a second lower surface portion constituting a lower surface of the outer end portion, The first lower surface portion is provided with an insertion portion to be inserted into the cross member, The outer end portion is provided with a fixed portion that is fixed to a fastening member provided on the cross member on a lower side of the first end portion, The first lower surface portion abuts against the upper surface of the cross member, The electric storage device according to claim 2 , wherein the second lower surface portion is provided so as to be spaced upward from the upper surface of the cross member.

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