Electricity storage device

Abstract

The invention relates to a power storage device. The power storage device includes a first power storage module and a second power storage module, a housing accommodating the first power storage module and the second power storage module, a cross member, a mounting member fixed to an upper surface of the cross member, and an electronic device. The height of the mounting member is higher than the height of the electronic device in the vertical direction, the electronic device is arranged adjacent to the mounting member in the second direction and includes a first end portion located on the mounting member side in the second direction and a second end portion located on the opposite side of the mounting member side in the second direction, the first end portion is fixed to the mounting member, and the second end portion is fixed to the mounting member. The second end portion is fixed to the cross beam.

Description

Technical Field

[0001] The present disclosure relates to a power storage device. Background Art

[0002] As a conventional power storage device, a battery module having a plurality of cells arranged in parallel and a restraint that integrates the plurality of cells is disclosed in Japanese Patent No. 6003838. The battery module has a structure in which at least one of a battery monitoring ECU that monitors the status of the plurality of cells and a switching element unit having a switching element controlled by the battery monitoring ECU is thermally connected to the restraint. Summary of the invention

[0003] However, in the configuration disclosed in Japanese Patent No. 6003838, when the battery module undergoes thermal expansion due to the heat generated by the single battery, stress is applied to the restraint. In this case, stress is applied to the substrate of the battery monitoring ECU or the substrate of the switch element connected to the restraint. Similarly, when the battery module undergoes contraction, stress is also applied to the substrate of the battery monitoring ECU or the substrate of the switch element connected to the restraint. Therefore, there is a concern that the battery monitoring ECU or the switch element will no longer function normally.

[0004] The present disclosure has been made in view of the above-mentioned problems, and an object of the present disclosure is to provide a power storage device capable of reducing stress applied to electronic equipment that monitors a power storage module.

[0005] The power storage device according to the present disclosure includes:

[0006] The first power storage module and the second power storage module are arranged side by side in a first direction orthogonal to the up-down direction;

[0007] A housing for housing the first power storage module and the second power storage module;

[0008] a beam disposed between the first power storage module and the second power storage module in the housing and extending in a second direction perpendicular to the up-down direction and the first direction;

[0009] A mounting member fixed to the upper surface of the beam; and

[0010] The electronic device monitors the first power storage module or the second power storage module.

[0011] In the up-down direction, the height of the mounting member is higher than the height of the electronic device.

[0012] The electronic device is arranged adjacent to the mounting member in the second direction and includes a first end located on the mounting member side in the second direction and a second end located on the opposite side to the mounting member side in the second direction.

[0013] The first end portion is fixed to the mounting member.

[0014] The second end portion is fixed to the horizontal beam.

[0015] According to the above configuration, the electronic device is arranged on the beam arranged between the first power storage module and the second power storage module. Therefore, it is possible to suppress the stress caused by expansion or contraction of the first power storage module and the second power storage module from being transmitted to the electronic device.

[0016] In addition, when stress is input from the upper side of the housing, it can be transmitted to the bottom wall of the housing via the mounting member and the beam that are higher than the electronic device. On the other hand, when stress is input from the lower side of the housing, it can be transmitted to the upper wall of the housing via the beam and the mounting member. Therefore, when stress is input to the housing in the up-down direction, the transmission of stress to the electronic device can also be suppressed.

[0017] Furthermore, since the first end of the electronic device is fixed to the mounting member and the second end of the electronic device is fixed to the cross member, it is possible to suppress the input acceleration to the electronic device with respect to the vibration input when the vehicle is running.

[0018] In the above-mentioned power storage device according to the present disclosure,

[0019] The above-mentioned mounting component may include: a column portion, which is located on the above-mentioned first end side of the above-mentioned electronic device in the above-mentioned second direction and is higher in the above-mentioned up-down direction than the above-mentioned electronic device; and an outer end portion, which is arranged adjacent to the above-mentioned column portion in a manner of being located closer to the above-mentioned first end side than the above-mentioned column portion in the above-mentioned second direction and is used to fix the above-mentioned first end portion.

[0020] In the up-down direction, the height of the outer end portion may be lower than the height of the column portion.

[0021] A fragile portion may be provided at a boundary between the outer end portion and the column portion.

[0022] According to the above configuration, when stress is input to the housing in the up-down direction, the fragile portion is ruptured, so that the stress acting on the column portion can be suppressed from being transmitted to the outer end portion.

[0023] In the above-mentioned power storage device according to the present disclosure,

[0024] The mounting member may include 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.

[0025] The first lower surface portion may be provided with an insertion portion to be inserted into the horizontal beam.

[0026] The outer end portion may be provided with a fixed portion fixed by a fastening member provided on the horizontal beam on the first end portion side and the lower portion side.

[0027] The first lower surface portion abuts against the upper surface of the beam.

[0028] The second lower surface portion is provided so as to be spaced apart upward from the upper surface of the horizontal beam.

[0029] According to the above configuration, the second lower surface portion is arranged between the fixed portion and the insertion portion in a manner separated from the upper surface of the beam, so that the fragile portion can be easily broken. Thus, when stress is input to the housing in the vertical direction, the stress acting on the column portion can be prevented from being transmitted to the outer end.

[0030] According to the present disclosure, it is possible to provide a power storage device capable of reducing stress applied to electronic equipment that monitors a power storage module. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Features, advantages and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which like numerals represent like elements.

[0032] Figure 1 is a diagram showing an exploded perspective view of a power storage device according to an embodiment;

[0033] Figure 2 is a perspective view schematically showing the configuration of a power storage device according to an embodiment;

[0034] Figure 3 is a schematic perspective view showing a fixing structure of an electronic device in a power storage device according to an embodiment;

[0035] Figure 4 It is along Figure 3 A cross-sectional view of line IV-IV shown;

[0036] Figure 5 It is a diagram showing a state in which the mounting member according to the embodiment is broken. DETAILED DESCRIPTION

[0037] 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 numerals in the drawings, and their description will not be repeated.

[0038] Figure 1 It is a diagram showing an exploded perspective view of the power storage device according to the embodiment. Figure 2 2 is a perspective view schematically showing the configuration of an electric storage device according to an embodiment. Figure 1 and Figure 2 , a power storage device 1 according to an embodiment will be described.

[0039] like Figure 1 and Figure 2 As shown, the power storage device 1 includes a plurality of power storage modules 10 , a plurality of beams 20 , a plurality of mounting members 30 , a plurality of electronic devices 41 and 42 , and a casing 200 .

[0040] The plurality of power storage modules 10 are arranged at intervals in a first direction (DR1 direction) orthogonal to the up-down direction. The plurality of 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 in sequence in the first direction.

[0041] The number of power storage modules 10 is not limited to 4, and may be 2 or more. When the power storage device 1 is mounted on a vehicle, the first direction is parallel to the front-rear direction of the vehicle, for example.

[0042] 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. In addition, the number of power storage stacks 100 included in the power storage module 10 is not limited to two, and may be a single one or more than three. The plurality of power storage stacks 100 are arranged in a row in the first direction.

[0043] Each of the electric storage stacks 100 includes a first unit stack 101 , a second unit stack 102 , and an intermediate plate 103 .

[0044] The first unit stack 101 and the second unit stack 102 each include a plurality of storage cells 110 arranged in a second direction (DR2 direction) perpendicular to the vertical direction and the first direction. The storage cell 110 is, for example, a secondary battery such as a nickel-metal hydride battery or a lithium-ion battery. The storage cell 110 has, for example, a square shape. The storage cell 110 may use a liquid electrolyte or a solid electrolyte.

[0045] The first unit stack 101 is arranged at one side in the second direction. The first unit stack 101 may include an end plate. The end plate is arranged outside the power storage cell 110 arranged most outside at one side in the second direction.

[0046] The second unit stack 102 is arranged on the other side in the second direction. In the present embodiment, the number of the storage cells 110 included in the second unit stack 102 is the same as the number of the storage cells 110 included in the first unit stack 101, but may be different. The second unit stack 102 may include an end plate arranged outside the storage cells 110 on the other side in the second direction.

[0047] The intermediate plate 103 is disposed between the first unit stack 101 and the second unit stack 102. The intermediate plate 103 is disposed at the center of the power storage stack 100 in the second direction. The intermediate plate 103 is made of synthetic resin or the like.

[0048] The housing 200 accommodates a plurality of power storage modules 10, a plurality of beams 20, a plurality of mounting members 30, and a plurality of electronic devices 41 and 42. The housing 200 includes a lower housing 210 and an upper housing 220. Figure 2 For convenience, the upper housing 220 is omitted.

[0049] The lower case 210 has a substantially box-like shape that is open upward. The lower case 210 is made of metal, synthetic resin, etc. The lower case 210 has a bottom wall 212 , a lower side peripheral wall portion 214 , and a lower side flange 216 .

[0050] The bottom wall 212 is disposed below the plurality of power storage modules 10. A cooler (not shown) may be provided below the bottom wall 212 to cool the power storage stack 100 via the bottom wall 212. In this case, a heat conduction member may be provided between the cooler and the bottom wall 212, or between each power storage stack 100 and the bottom wall 212. As the heat conduction member, for example, an adhesive including silicone resin, acrylic resin, or epoxy resin, grease, or the like may be used.

[0051] The lower peripheral wall portion 214 stands from the peripheral edge portion of the bottom wall 212 and surrounds the lower portions of the plurality of power storage modules 10. The lower flange 216 has a shape extending outward from the upper end portion of the lower peripheral wall portion 214.

[0052] The upper case 220 has a generally box-like shape that is open downward. The upper case 220 accommodates a plurality of power storage modules 10 together with the lower case 210. The upper case 220 is made of metal or synthetic resin. The upper case 220 has a top wall 222, an upper side peripheral wall portion 224, and an upper side flange 226.

[0053] The top wall 222 is disposed above the plurality of power storage stacks 100 . The top wall 222 faces the bottom wall 212 in the vertical 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 .

[0054] The upper side peripheral wall portion 224 extends downward from the peripheral portion of the top wall 222 and surrounds the upper portion of the plurality of power storage modules 10. The upper side peripheral wall portion 224 and the lower side peripheral wall portion 214 together constitute the peripheral wall of the housing 200. The lower side peripheral wall portion 214 and the upper side peripheral wall portion 224 connect the peripheral portion of the bottom wall 212 and the peripheral portion of the top wall 222, and surround the plurality of power storage stacks 100.

[0055] The upper flange 226 has a shape extending outward from the lower end of the upper peripheral wall 224. The upper flange 226 is fixed to the lower flange 216 by bolts or the like.

[0056] The plurality of beams 20 are respectively arranged in each gap between the power storage modules 10 adjacent to each other in the first direction. Specifically, the beam 20 is arranged in the gap between the first power storage module 10A and the second power storage module 10B. Furthermore, the beam 20 is arranged in the gap between the second power storage module 10B and the third power storage module 10C. Furthermore, the beam 20 is arranged in the gap between the third power storage module 10C and the fourth power storage module 10D.

[0057] The cross beam 20 is fixed to the bottom wall 212. The bottom wall 212 extends along the second direction. Both ends of the cross beam 20 may be connected to the lower side peripheral wall portion 214. The cross section of the cross beam 20 perpendicular to the second direction is formed into a shape convex upward. Specifically, the cross beam 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 substantially flat.

[0058] The mounting member 30 is fixed to the upper surface 20a of the beam 20 (see Figure 3 The mounting member 30 includes a first column portion 31 , a second column portion 32 , a connecting portion 33 , a first outer end portion 35 , and a second outer end portion 36 .

[0059] The first column 31 and the second column 32 are located on the beam 20 so as to be spaced apart in the second direction. The first column 31 is located on the second side of the second column 32. The upper end of the first column 31 and the upper end of the second column 32 may be in contact with the top wall 222 or may be separated from the top wall 222.

[0060] The heights of the first column 31 and the second column 32 in the vertical direction are greater than the heights of the connecting portion 33, the first outer end portion 35, and the second outer end portion 36. In addition, the heights of the first column 31 and the second column 32 in the vertical direction are greater than the heights of the electronic devices 41 and 42. Thus, the first column 31 and the second column 32 transfer the load input downward to the top wall 222 to the cross beam 20. Similarly, the first column 31 and the second column 32 transfer the load input upward to the bottom wall 212 from the cross beam 20 to the top wall 222.

[0061] The connection portion 33 connects the first column portion 31 and the second column portion 32. The connection portion 33 extends along the second direction.

[0062] The first outer end portion 35 constitutes an end portion of the mounting member 30 on one side in the second direction. The first outer end portion 35 is provided so as to be located closer to the first end portion 411 of the electronic device 41 than the first column portion 31 in the second direction. As described later, the first end portion 411 of the electronic device 41 is fixed to the first outer end portion 35.

[0063] The first outer end portion 35 is provided adjacent to the first column portion 31. A first fragile portion 37 is provided at a boundary portion between the first outer end portion 35 and the first column portion 31.

[0064] The second outer end portion 36 constitutes the end portion of the mounting member 30 on the other side in the second direction. The second outer end portion 36 is provided so as to be located closer to the first end portion 421 of the electronic device 42 than the second column portion 32 in the second direction. As described later, the first end portion 421 of the electronic device 42 is fixed to the second outer end portion 36.

[0065] The second outer end portion 36 is provided adjacent to the second column portion 32. A second fragile portion 38 is provided at a boundary portion between the second outer end portion 36 and the second column portion 32.

[0066] The electronic device 41 is located on the second direction side relative to the mounting member 30. The electronic device 41 is arranged adjacent to the mounting member 30 in the second direction. The electronic device 41 is arranged on the mounting member 30.

[0067] 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 mounting member 30 side in the second direction. The second end 412 is located on the opposite side to the side where the mounting member 30 is located in the second direction.

[0068] The electronic device 41 is a monitoring unit that monitors the power storage module 10. The electronic device 41 monitors at least one of the mutually 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.

[0069] The electronic device 42 is located on the second direction side relative to the mounting member 30. The electronic device 42 is arranged adjacent to the mounting member 30 in the second direction. The electronic device 42 is arranged on the mounting member 30.

[0070] 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 mounting member 30 side in the second direction. The second end 422 is located on the opposite side to the side where the mounting member 30 is located in the second direction.

[0071] The electronic device 42 is a monitoring unit that monitors a different power storage module 10 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 while the electronic device 41 monitors the first power storage module 10A.

[0072] Figure 3 1 is a schematic perspective view showing a fixing structure of an electronic device in a power storage device according to an embodiment. Figure 3 , the fixing structure of the electronic device 41 is described.

[0073] like Figure 3 As shown, a first end portion 411 of the electronic device 41 is fixed to the mounting member 30 , and a second end portion 412 of the electronic device 41 is fixed to the beam 20 .

[0074] Specifically, the first end 411 of the electronic device 41 is fixed to the first outer end 35 by the inner connecting member 51. The inner connecting member 51 has a shape extending from the first end 411 toward the mounting member 30. The end of the inner connecting member 51 located on the mounting member 30 side is fixed to the bolt 71 protruding from the upper surface of the first outer end 35. The end of the inner connecting member 51 located on the electronic device 41 side is fixed to the first end 411 side.

[0075] The second end 412 of the electronic device 41 is fixed to the upper surface 20a of the beam 20 at the side closer to the second direction than the second end 412 by the outer connecting member 52. The outer connecting member 52 has a shape extending from the second end 412 toward the one side in the second direction. The end of the outer connecting member 52 located on the electronic device 41 side is fixed to the second end 412 side. The end of the outer connecting member 52 located on the one side in the second direction is fixed to the bolt 72 protruding upward from the upper surface 20a of the beam 20.

[0076] The electronic device 42 is also fixed in the same manner as the electronic device 41. Specifically, the first end 421 of the electronic device 42 is fixed to the second outer end 36 of the mounting member 30 via an inner connecting member (not shown). The second end 422 of the electronic device 42 is fixed to the upper surface 20a of the beam 20 at the other side of the second end 422 in the second direction via an outer connecting member (not shown).

[0077] As described above, the electronic devices 41 and 42 are provided on the beams 20 disposed between the adjacent power storage modules 10 . Therefore, when the power storage modules 10 expand or contract, the stress caused by the expansion or contraction can be suppressed from being transmitted to the electronic devices 41 and 42 .

[0078] In addition, the height of the electronic devices 41 and 42 is set lower than the height of the mounting member 30. Therefore, when stress is input to the housing 200 in the vertical direction, 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 crossbeam 20 and the mounting member 30. Thus, the transmission of stress to the electronic devices 41 and 42 can be suppressed.

[0079] As described above, in each of the electronic devices 41 and 42, one end of both ends is fixed to the mounting member 30, and the other end is fixed to the cross member 20. Thus, the input acceleration to the electronic devices 41 and 42 can be suppressed with respect to the vibration input when the vehicle is running.

[0080] In addition, even if it is difficult to fix the ends (first ends) of the electronic devices 41 and 42 located on the mounting member 30 side to the beam 20 , the electronic devices 41 and 42 can be stably fixed by fixing the first ends to the mounting member 30 .

[0081] Furthermore, a fixed portion 351 is provided at the first outer end portion 35 on the first end portion 411 side (one side in the first direction) and the lower side. The fixed portion 351 is fixed by a bolt 73 as a fastening member provided on the horizontal beam 20 .

[0082] Similarly, a fixed portion is provided at the second outer end portion 36 on the first end portion 421 side (the other side in the first direction) and on the lower side. The fixed portion is fixed by a bolt serving as a fastening member provided on the cross member 20 .

[0083] Figure 4 It is along Figure 3 The cross-sectional view of the IV-IV line is shown. Figure 4As shown, the mounting 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. An insertion portion 31c protruding downward is provided on the first lower surface portion 31b. The insertion portion 31c is inserted into the upper surface 20a of the beam 20. Also on the side of the second column portion 32, an insertion portion is provided on the lower surface of the second column portion 32, and the insertion portion is inserted into the upper surface 20a. The first lower surface portion 31b abuts against the upper surface 20a.

[0084] The second lower surface portion 35b is disposed so as to be away from the upper surface 20a of the beam 20 upward. Specifically, the second lower surface portion 35b is inclined so as to be away from the first column portion 31 in the second direction and go upward. The lower surface 351a of the fixed portion 351 is substantially 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 be away from the second column portion 32 and go upward.

[0085] Furthermore, 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.

[0086] Figure 5 1 is a diagram showing a state where the mounting member according to the embodiment is broken. As described above, the first fragile portion 37 is provided at the boundary between the first column portion 31 and the first outer end portion 35. The first fragile portion 37 is formed by a notch such as a cutout or a slit.

[0087] like Figure 5 As shown, the first fragile portion 37 is provided so as to be breakable when a predetermined load is applied to the mounting member 30. When a large stress is applied to the housing 200 due to a collision of a vehicle or the like and the mounting member 30 bears the stress, the first fragile portion 37 is broken, thereby preventing the stress from being transmitted from the mounting member 30 side to the electronic device 41. Similarly, the second fragile portion 38 is broken, thereby preventing the stress from being transmitted from the mounting member 30 side to the electronic device 42. As a result, damage to the electronic devices 41 and 42 can be suppressed.

[0088] Furthermore, as described above, since the second lower surface portion 35 b and the third lower surface portion are provided to be spaced upward from the upper surface 20 a , when stress is input to the mounting member 30 , the first fragile portion 37 and the second fragile portion 38 can be easily broken.

[0089] Other Modifications

[0090] In the above, the case where the first ends of the electronic devices 41 and 42 are indirectly fixed to the mounting member 30 via the inner connecting member is described as an example, but the inner connecting member may be omitted and the first ends may be directly fixed to the mounting member 30 .

[0091] In the above, the case where the second ends of the electronic devices 41 and 42 are fixed to the beam 20 via the outer connecting member is described as an example, but the outer connecting member may be omitted and the second ends may be directly fixed to the beam 20 .

[0092] The embodiments disclosed herein are illustrative in all aspects and are not restrictive. The scope of the present invention is indicated by the claims, and all modifications within the meaning and scope equivalent to the claims are included.

Claims

1. A power storage device comprising: The first power storage module and the second power storage module are arranged side by side in a first direction orthogonal to the up-down direction; a housing for housing the first power storage module and the second power storage module; a beam disposed between the first power storage module and the second power storage module in the housing and extending in a second direction orthogonal to the up-down direction and the first direction; A mounting member fixed to the upper surface of the beam; and an electronic device that monitors the first power storage module or the second power storage module, In the up-down direction, the height of the mounting member is higher than the height of the electronic device. The electronic device is arranged adjacent to the mounting member in the second direction, and includes a first end located on the mounting member side in the second direction and a second end located on the opposite side of the mounting member in the second direction. The first end portion is fixed to the mounting member, The second end portion is fixed to the horizontal beam.

2. The power storage device according to claim 1, The mounting member includes: a column portion, which is located on the first end side of the electronic device in the second direction and is higher in the vertical direction than the electronic device; and an outer end portion, which is disposed adjacent to the column portion in a manner that the column portion is located closer to the first end side than the column portion in the second direction and to which the first end portion is fixed. In the up-down direction, the height of the outer end portion is lower than the height of the column portion. A fragile portion is provided at a boundary between the outer end portion and the column portion.

3. The power storage device according to claim 2, 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 beam. A fixed portion fixed by a fastening member provided on the beam is provided at the outer end portion on the first end portion side and the lower portion side. The first lower surface portion abuts against the upper surface of the beam, The second lower surface portion is provided so as to be spaced apart upward from the upper surface of the beam.

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