Electricity storage device

Abstract

The utility model 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] Japanese Patent No. 6003838 discloses a battery module comprising a plurality of battery cells arranged side by side and a restraint that integrates the plurality of battery cells. This battery module is configured such that at least one of a battery monitoring ECU that monitors the status of the plurality of battery cells and a switching element unit comprising a switching element controlled by the battery monitoring ECU is thermally bonded to the restraint. Utility Model Content

[0003] However, in the configuration disclosed in Japanese Patent No. 6003838, if the battery module expands due to heat generated by the cells, stress will be applied to the restraints. This will also apply stress to the substrate of the battery monitoring ECU or the substrate of the switching element attached to the restraints. Similarly, if the battery module contracts, stress will also be applied to the substrate of the battery monitoring ECU or the substrate of the switching element attached to the restraints. Consequently, there is a concern that the battery monitoring ECU or the switching element will no longer function properly.

[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 perpendicular 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 in the housing between the first and second power storage modules 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 of the mounting member 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 placed on the beam disposed between the first and second power storage modules, thereby preventing stress caused by expansion or contraction of the first and second power storage modules from being transmitted to the electronic device.

[0016] Furthermore, if 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 crossbeam, which are taller than the electronic device. On the other hand, if stress is input from the lower side of the housing, it can be transmitted to the upper wall of the housing via the crossbeam and the mounting member. Therefore, even if stress is input to the housing in the vertical direction, the transmission of stress to the electronic device can be suppressed.

[0017] Furthermore, since the first end portion of the electronic device is fixed to the mounting member and the second end portion of the electronic device is fixed to the cross member, the acceleration input to the electronic device can be suppressed in response to vibration input during vehicle travel.

[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 than the above-mentioned electronic device in the above-mentioned up-down direction; and an outer end portion, which is arranged adjacent to the above-mentioned column portion in a manner that is 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, the fragile portion ruptures, and thus when stress is input to the housing in the vertical direction, 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 lower side of the first end portion.

[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, by arranging the second lower surface portion between the fixed portion and the insertion portion so as to be separated from the upper surface of the crossbeam, the fragile portion can be easily broken. This can prevent the stress acting on the column portion from being transferred to the outer end portion when stress is input to the housing in the vertical direction.

[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 taken along line IV-IV is shown;

[0036] Figure 5 This is a diagram showing a state in which a 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 shown below, identical or common parts will be denoted by identical 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 1 is a perspective view schematically showing the configuration of the power storage device according to the embodiment. Figure 1 and Figure 2 , the power storage device 1 according to the 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 energy storage modules 10 are arranged in a first direction (DR1 direction) perpendicular to the vertical direction, spaced apart from each other. For example, the plurality of energy storage modules 10 include four energy storage modules 10, namely, a first energy storage module 10A, a second energy storage module 10B, a third energy storage module 10C, and a fourth energy storage module 10D. The first energy storage module 10A, the second energy storage module 10B, the third energy storage module 10C, and the fourth energy storage module 10D are arranged in order 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 multiple power storage stacks 100. In this embodiment, each power storage module 10 includes two power storage stacks 100. Furthermore, the number of power storage stacks 100 included in a power storage module 10 is not limited to two and may be a single stack or three or more. Multiple power storage stacks 100 are arranged side by side in the first direction.

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

[0044] Each of the first unit stack 101 and the second unit stack 102 includes a plurality of storage cells 110 arranged in a second direction (DR2 direction) perpendicular to the vertical direction and the first direction. Storage cells 110 are, for example, secondary batteries such as nickel-metal hydride batteries or lithium-ion batteries. Storage cells 110 have, for example, a square shape. Storage cells 110 may use either a liquid electrolyte or a solid electrolyte.

[0045] The first unit stack 101 is arranged on one side in the second direction. The first unit stack 101 may include an end plate. The end plate is arranged on the outer side of the outermost storage cell 110 on one side in the second direction.

[0046] The second unit stack 102 is arranged on the other side in the second direction. In this embodiment, the number of storage cells 110 included in the second unit stack 102 is the same as the number of storage cells 110 included in the first unit stack 101, but the number 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 a synthetic resin or the like.

[0048] The housing 200 houses 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 housing 210 has a substantially box-like shape that is open upward. The lower housing 210 is made of metal, synthetic resin, etc. The lower housing 210 includes a bottom wall 212 , a lower peripheral wall portion 214 , and a lower flange 216 .

[0050] The bottom wall 212 is disposed below the plurality of battery modules 10. A cooler (not shown) may be provided below the bottom wall 212 to cool the battery 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 battery stack 100 and the bottom wall 212. The heat conduction member may be, for example, an adhesive containing silicone resin, acrylic resin, or epoxy resin, or grease.

[0051] The lower peripheral wall 214 rises from the peripheral edge of the bottom wall 212 and surrounds the lower portions of the plurality of power storage modules 10. The lower flange 216 extends outward from the upper end of the lower peripheral wall 214.

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

[0053] The top wall 222 is disposed above the plurality of battery 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 battery module 10 .

[0054] The upper side peripheral wall portion 224 extends downward from the peripheral edge of the top wall 222 and surrounds the upper portions of the plurality of battery modules 10. Together with the lower side peripheral wall portion 214, the upper side peripheral wall portion 224 forms the peripheral wall of the outer casing 200. The lower side peripheral wall portion 214 and the upper side peripheral wall portion 224 connect the peripheral edge of the bottom wall 212 and the peripheral edge of the top wall 222, thus surrounding the plurality of battery stacks 100.

[0055] 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.

[0056] A plurality of cross-beams 20 are disposed in each gap between adjacent energy storage modules 10 in the first direction. Specifically, a cross-beam 20 is disposed in the gap between the first energy storage module 10A and the second energy storage module 10B. Furthermore, a cross-beam 20 is disposed in the gap between the second energy storage module 10B and the third energy storage module 10C. Furthermore, a cross-beam 20 is disposed in the gap between the third energy storage module 10C and the fourth energy storage module 10D.

[0057] The crossbeam 20 is fixed to the bottom wall 212. The bottom wall 212 extends in the second direction. Both ends of the crossbeam 20 may be connected to the lower side wall portion 214. The cross section of the crossbeam 20 perpendicular to the second direction is formed into an upwardly convex shape. Specifically, the crossbeam 20 includes, for example, an upper wall portion forming the 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 portion 31 and the second column portion 32 are positioned on the cross member 20 so as to be spaced apart in the second direction. The first column portion 31 is positioned closer to the second side of the second column portion 32 in the second direction. The upper ends of the first column portion 31 and the upper ends of the second column portion 32 may be in contact with the top wall 222 or may be spaced apart from the top wall 222.

[0060] The vertical heights of the first and second pillars 31, 32 are greater than the heights of the connecting portion 33, the first outer end portion 35, and the second outer end portion 36. Furthermore, the vertical heights of the first and second pillars 31, 32 are greater than the heights of the electronic devices 41, 42. Thus, the first and second pillars 31, 32 transfer downward loads applied to the top wall 222 to the crossbeam 20. Similarly, the first and second pillars 31, 32 transfer upward loads applied to the bottom wall 212 from the crossbeam 20 to the top wall 222.

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

[0062] The first outer end portion 35 constitutes the 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 will be 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 will be 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 of the mounting member 30 in the second direction.

[0068] 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.

[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 of the mounting member 30 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 explained.

[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 via 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 on the side closer to the second direction than the second end 412 via the outer connecting member 52. The outer connecting member 52 has a shape that extends 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 a bolt 72 that protrudes 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 on 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 cross member 20 disposed between adjacent power storage modules 10. Therefore, when the power storage modules 10 expand or contract, stress caused by the expansion or contraction is suppressed from being transmitted to the electronic devices 41 and 42.

[0078] Furthermore, the height of electronic devices 41 and 42 is set lower than the height of mounting member 30. Therefore, when stress is input to housing 200 in the vertical direction, the stress can be transmitted from top wall 222 to bottom wall 212 or from bottom wall 212 to top wall 222 via crossbeam 20 and mounting member 30. This can suppress the transmission of stress to electronic devices 41 and 42.

[0079] Furthermore, as described above, in each of electronic devices 41 and 42, one end of each of the two ends is fixed to mounting member 30, and the other end is fixed to cross member 20. This suppresses the acceleration input to electronic devices 41 and 42 relative to vibration input during vehicle travel.

[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 on the first outer end portion 35 at 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 serving as a fastening member provided on the cross member 20 .

[0082] Similarly, a fixed portion is provided on 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. This 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 includes a first lower surface portion 31b forming the lower surface of the first column portion 31 and a second lower surface portion 35b forming the lower surface of the first outer end portion 35. The first lower surface portion 31b is provided with an insertion portion 31c protruding downward. The insertion portion 31c is inserted into the upper surface 20a of the crossbeam 20. Similarly, an insertion portion is provided on the lower surface of the second column portion 32, and this 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 upwardly away from the upper surface 20a of the crossbeam 20. Specifically, the second lower surface portion 35b is inclined upwardly as it moves away from the first column portion 31 in the second direction. The lower surface 351a of the fixed portion 351 is substantially parallel to the upper surface 20a. Similarly, on the side of the second outer end portion 36, the lower surface portion (third lower surface portion) of the second outer end portion 36 is inclined upwardly as it moves away from the second column portion 32.

[0085] Furthermore, the second lower surface portion 35b and the third lower surface portion may be provided with a step portion between themselves 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 3 is a diagram showing a situation in which 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, slit, or other cutout, for example.

[0087] like Figure 5 As shown, first fragile portion 37 is designed to break when a predetermined load is applied to mounting member 30. If a vehicle collision, for example, causes a large stress to be applied to housing 200 and mounting member 30 absorbs the stress, rupturing first fragile portion 37 prevents the stress from being transmitted from mounting member 30 to electronic device 41. Similarly, rupturing second fragile portion 38 prevents the stress from being transmitted from mounting member 30 to electronic device 42. Consequently, damage to 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 upwardly away from the upper surface 20 a , the first fragile portion 37 and the second fragile portion 38 can be easily broken when stress is input to the mounting member 30 .

[0089] Other variations

[0090] In the above description, 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 exemplified. However, the inner connecting member may be omitted and the first ends may be directly fixed to the mounting member 30 .

[0091] In the above description, the second ends of the electronic devices 41 and 42 are fixed to the beam 20 via the outer connecting member. However, 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 respects 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 intended to be encompassed.

Claims

1. A power storage device, characterized in that: have: The first power storage module and the second power storage module are arranged side by side in a first direction perpendicular to the up-down direction; a housing for housing the first power storage module and the second power storage module; a beam disposed in the housing between the first power storage module and the second power storage module and extending in a second direction perpendicular 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 vertical 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 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 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, wherein The mounting 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 vertical direction higher than that of the electronic device; and an outer end portion provided adjacent to the column portion so as to be 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 vertical 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, wherein The mounting member includes 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 for inserting 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 upward from the upper surface of the beam.

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