JP2011227998A - Power supply unit and assembled power supply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a fastening member from moving toward a power supply unit when an external shock is applied to a vehicle.SOLUTION: A power storage device includes: a battery group including a plurality of unit cells 1 to be mounted on a vehicle; a leg 30 formed on a battery case 10 that forms an outer face of the unit cell 1; and a fastening bolt 80 to be fastened to a fastening hole 30A formed in the leg 30 for fixing the leg 30 to a flange face 70A of a lower case 70. The leg 30 includes holes 30B and 30C located in a first direction that is an in-plane direction including a flange face 70A with respect to the fastening hole 30A and orthogonal to the direction from the leg 30 toward the battery case 10.

Description

  The present invention relates to a fixing structure for fixing a power supply body to a fixed surface of a vehicle.

  Conventionally, a secondary battery in which an electrolytic solution and an electrode body are housed in a case formed of a resin has been proposed. This type of secondary battery is mounted on a vehicle by providing a leg portion on the outer surface of the case and fixing the leg portion to a fixed surface of the vehicle using a fastening member.

JP 2008-130374 A

However, in the above configuration, when an external force is applied to the secondary battery from the outside of the vehicle and the leg portion is plastically deformed, the fastening member may face the case.
Then, this invention aims at suppressing that a fastening member goes to a power supply device, when receiving the impact from the vehicle exterior.

  In order to solve the above-described problems, a power supply device according to the present invention includes (1) a first power supply body mounted on a vehicle and a fastening member for fixing the power supply body to a fixed surface of the vehicle. A leg portion having an opening portion, and the leg portion is an in-plane direction including the fixed surface with respect to the first opening portion, and a direction from the leg portion toward the power supply body A second opening located in a first direction orthogonal to the first direction. According to the structure of (1), when receiving an impact from the vehicle exterior, it can suppress that a fastening member goes to a power supply device.

  (2) In the configuration of (1), when the first opening is viewed in the opening direction, the length from the second opening to the outer edge in the first direction is set to T1 in the leg portion. When the length from the first opening to the outer edge in the second direction orthogonal to the first direction and spaced from the power supply body is T2, it is preferable that the condition T2 ≧ T1 is satisfied. When receiving an impact from the outside of the vehicle, the leg portion can be broken along the region corresponding to the relatively fragile length T1. Thereby, it can suppress more effectively that a fastening member goes to a power supply device.

  (3) In the configuration of (2), the second opening can be positioned symmetrically on both sides of the first direction across the first opening. Thereby, the both ends of the said 1st direction of a leg part can be made into a fracture | rupture start position.

  (4) In the configuration of (1), the second opening portion has a first region including the first direction passing through a center of the first opening portion, and the first region. A second region that is orthogonal to the first direction and is adjacent to a second direction that is spaced apart from the power supply body, wherein the first region is more in the first direction than the second region. Long opening width. According to the configuration of (4), when receiving an impact from the outside of the vehicle, the leg portion can be broken in the first direction along the first region.

  (5) In the configuration of (4), when the total length of the legs other than the first and second openings in the first direction passing through the center of the first opening is T3. In addition, it is preferable to satisfy the condition of T2 ≧ T3. The effect obtained by the configuration of (4) can be further enhanced.

  (1)-(5) WHEREIN: You may form the said leg part in the spacer member interposed between the outer surface of the accommodating member which accommodates an electrode body, or the power supply body adjacent to a 1st direction.

  According to the present invention, it is possible to suppress the fastening member from moving toward the power supply device when receiving an impact from the outside of the vehicle.

It is a perspective view of a power storage device. It is sectional drawing of a cell. It is the schematic of an electric power generation element. It is a Z arrow view of a leg part. It is a Z arrow view of a leg part, and is a figure showing the behavior at the time of fracture. It is a Z arrow view of the leg part of Embodiment 2. FIG. 10 is a Z arrow view of a leg portion that is a modification of the second embodiment. It is a perspective view of the electrical storage apparatus of a modification.

  FIG. 1 is a perspective view of the power storage device. FIG. 2 is a cross-sectional view of the power storage device taken along the YZ plane. FIG. 3 is a schematic view of the power generation element. Power storage device 100 includes an assembled battery including a plurality of single cells 1. These unit cells 1 are arranged in the X-axis direction, and the unit cells 1 adjacent in the X-axis direction are in contact with each other. End plates (not shown) are located at both ends of the assembled battery in the X-axis direction. These end plates are connected to each other by a restraining bar (not shown) and compress the unit cells 1 in the X-axis direction.

  The unit cell 1 includes a battery case 10 and a power generation element 11 (see FIG. 3) housed inside the battery case 10. The battery case 10 may be formed from an insulating resin. The power generation element 11 is an element that can be charged and discharged, and is housed in a wound state inside the battery case 10.

  The power generation element 11 includes a positive electrode body 12, a negative electrode body 13, and a separator 14 disposed between the positive electrode body 12 and the negative electrode body 13. Here, the positive electrode body 12 includes a current collector and a positive electrode layer formed on the surface of the current collector. The positive electrode layer can be formed on one side or both sides of the current collector. The positive electrode layer is a layer containing an active material, a conductive agent, or the like corresponding to the positive electrode. Moreover, the negative electrode body 13 is comprised by the electrical power collector and the negative electrode layer formed in the surface of an electrical power collector. The negative electrode layer can be formed on one side or both sides of the current collector. The negative electrode layer is a layer containing an active material, a conductive agent, or the like corresponding to the negative electrode.

  Note that an electrode (a so-called bipolar electrode) in which a positive electrode layer is formed on one surface of the current collector and a negative electrode layer is formed on the other surface of the current collector can also be used. In this embodiment, an electrolytic solution is used, but a solid electrolyte formed of particles can also be used. Examples of the solid electrolyte include a polymer solid electrolyte and an inorganic solid electrolyte.

Here, when the unit cell 1 is a nickel-hydrogen battery, nickel oxide is used as the active material of the positive electrode layer, and MmNi _(5-xyz) Al _x Mn is used as the active material of the negative electrode layer. A hydrogen storage alloy such as _y Co _z (Mm: Misch metal) can be used. When the unit cell 1 is a lithium ion battery, a lithium-transition metal composite oxide can be used as the active material for the positive electrode layer, and carbon can be used as the active material for the negative electrode layer. As the conductive agent, acetylene black, carbon black, graphite, carbon fiber, or carbon nanotube can be used.

  With reference to FIGS. 1 and 2, the upper end surface of the battery case 10 in the Z-axis direction has a gas release valve 50. The gas release valve 50 is a destructive valve formed thin. When gas is generated from the power generation element 11 when the battery is abnormal, the internal pressure of the battery case 10 increases. When the internal pressure of the battery case 10 exceeds a predetermined value, the gas release valve 50 is broken and the gas inside the battery case 10 is released to the outside. Thereby, the internal pressure rise of the battery case 10 can be suppressed. The gas release valve 50 may be a spring-type automatic return valve. The gas release valve 50 is connected to a gas discharge tube (not shown), and the gas is discharged outside the vehicle through the gas discharge tube.

  Electrode members 40 are located on both end faces of the battery case 10 in the Y-axis direction. The electrode member 40 has a protruding shape. The electrode members 40 adjacent to each other in the X-axis direction have different polarities and are connected by a conductive member (bus bar) (not shown).

  Referring to FIG. 2, a pair of leg portions 30 are located on both end surfaces of battery case 10 in the Y-axis direction. The leg 30 is formed integrally with the battery case 10 and extends along the XY plane. The pair of leg portions 30 are located on the upper surface (fixed surface) of the flange portion 70 </ b> A of the lower case 70. In FIG. 1, the lower case 70 is omitted. One of the pair of legs 30 has a fastening hole (first opening) 30A. The fastening hole 30A has a spiral female screw portion on the inner peripheral surface. The fastening bolt 80 is fastened to the fastening hole 30A from the opposite side of the leg 30 with the flange 70A interposed therebetween. By fastening fastening bolt 80 to fastening hole 30A, power storage device 100 can be fixed to the vehicle. The other leg 30 does not have the fastening hole 30A. By omitting the fastening bolt 80 for the other leg 30, the cost can be reduced by reducing the number of parts.

  When the power storage device 100 is viewed from the Z-axis direction, the leg portions 30 having the fastening hole portions 30A are positioned in a zigzag shape (a cross shape intersecting the X-axis direction). That is, in the unit cells 1 adjacent to each other in the X-axis direction, one unit cell 1 has a fastening hole 30A formed in the leg 30 on one end side in the Y-axis direction, and the other unit cell 1 has the Y-axis direction. A fastening hole 30A is formed in the leg 30 on the other end side.

Next, with reference to FIG. 4, the structure of the leg part 30 which has the fastening hole part 30A is demonstrated in detail. FIG. 4 is a Z arrow view of the leg, where the X-axis direction corresponds to the first direction and the Y-axis direction corresponds to the second direction. The fastening hole 30A is located at the approximate center of the leg 30 in the X-axis direction. Holes 30B and 30C (second openings) are located on both sides in the X-axis direction of the fastening hole 30A. The holes 30B and 30C have a rectangular shape and are positioned symmetrically with respect to the fastening hole 30A. Here, in the leg 30, when the length from the hole 30B to the outer edge in the X-axis direction is T1, and the length from the fastening hole 30A to the outer edge in the Y-axis direction is T2, the following equation (1) Satisfied.
T2 ≧ T1 (1)

  The effect by satisfying the formula (1) will be described with reference to FIG. FIG. 5 is a Z arrow view of the leg, and schematically shows the behavior at the time of breakage. When an external force is applied to power storage device 100 from the outside of the vehicle in the direction of the arrow, leg portion 30 receives an impact in a direction approaching battery case 10. Here, since the region indicated by the length T1 is shorter than the region indicated by the length T2, it has a relatively fragile structure. Therefore, the leg 30 is broken along the wavy line. Thereby, it can suppress that the fastening bolt 80 goes to the battery case 10. FIG.

  The effect obtained by the above equation (1) has been verified by a collision test. However, in this specification, the fracture mechanism is logically explained, and therefore, the experimental data of the collision test is omitted.

(Embodiment 2)
In Embodiment 1 described above, the shape of the holes 30B and 30C located on both sides of the fastening hole 30A is rectangular, but the holes 30D and 30E of the present embodiment include regions having different widths in the X-axis direction. Shape. FIG. 6 is a Z arrow view of the leg portion 30 of the present embodiment, and the same reference numerals are given to the same components as those of the first embodiment.

  The fastening hole 30A is located at the approximate center of the leg 30 in the X-axis direction. Holes 30D and 30E are located on both sides of the fastening hole 30A in the X-axis direction. The holes 30D and 30E are positioned symmetrically with respect to the fastening hole 30A. The hole 30D is configured by a triangular hole-shaped protruding hole 301D located on the center side in the Y-axis direction, and a rectangular hole 302D positioned on both sides of the protruding hole 301D in the Y-axis direction. The projecting hole 301D has a shape that inclines in a direction away from the center as it approaches the center in the Y-axis direction, and its top is located at a position aligned with the center of the fastening hole 30A in the X-axis direction. Accordingly, the width in the X-axis direction of the hole 30D is a region on the two-dot chain line I passing through the center of the fastening hole 30A rather than the region (second region) on the two-dot chain line II passing through the rectangular hole 302D. (First region) is larger. The hole 30E is composed of a protruding hole 301E and a rectangular hole 302E. The details of the hole 30E are the same as those of the hole 30D, and are therefore omitted.

Here, in the leg part 30, the length from the protruding hole part 301D to the outer edge in the X-axis direction of the leg part 30 is T4, and the length from the fastening hole part 30A to the outer edge in the Y-axis direction of the leg part 30 is T2. When satisfied, it is preferable to satisfy the following expression (2).
T2 ≧ T4 (2)
The length T4 is a length based on the top of the protruding hole 301D. By satisfying the expression (2), the leg 30 can be broken in the X-axis direction along the top of the protruding hole 301D.

Here, in the leg part 30, when the total length other than the fastening hole part 30A and the hole parts 30D and 30E on the two-dot chain line I is T3, it is more preferable that the following expression (3) is satisfied.
T2 ≧ T3 (3)
Here, T3 = T4 + T5 + T6 + T7, T5 is the length from the projecting hole 301D to the fastening hole 30A, T6 is the length from the fastening hole 30A to the projecting hole 301E, and T7 is from the projecting hole 301E to the outer edge. Indicates the length.
By satisfying the expression (3), the effect obtained by the above expression (2) can be enhanced. Although the effects obtained by the above formulas (2) and (3) have been verified by a crash test, the description of the crash test experimental data is omitted in this specification because the mechanism of fracture is logically explained. To do.

  In the present embodiment, the lengths T4, T5, T6, and T7 are all set to the same length, but may be set to different lengths.

  Instead of the holes 30D and 30E of the present embodiment, the holes 30F and 30G illustrated in FIG. 7 may be used. The holes 30F and 30G bend in a direction away from the center as they approach the center in the Y-axis direction of the holes 30F and 30G.

(Modification)
In the above-described embodiment, the leg 30 is provided on the outer surface of the battery case 10 containing the electrolytic solution and the electrode body, but the present invention is not limited to this. For example, the present invention can be applied to a power storage module in which a plurality of small power storage elements each containing an electrolytic solution and an electrode are accommodated in a small case. Specifically, a leg portion is provided on the large case, and the present invention can be applied to the leg portion.

  In the above-mentioned embodiment, although the internal thread part was formed in the fastening hole part 30A of the leg part 30, this invention is not limited to this. For example, the female screw portion of the fastening hole 30A can be omitted. In this case, the leg 30 can be fixed to the lower case 70 by projecting the fastening bolt 80 from the upper end surface of the leg 30 and fastening a nut member (not shown) to the projecting portion. Further, both the leg portions 30 may have the fastening hole portion 30A and the hole portions 30B and 30C. Furthermore, the leg part 30 of all the single cells 1 may have the hole parts 30A-30C.

  In the above-described embodiment, the power storage device 100 is fixed to the lower case 70, but may be fixed to another structure of the vehicle. In this case, the attachment surface of the leg 30 in the other structure is a fixed surface.

  The present invention can also be applied to a fixing structure for fixing other power source bodies such as capacitors and fuel cells to a vehicle.

  The present invention can also be applied to the power storage device 200 shown in FIG. The power storage device 200 includes a unit cell 201, a spacer member 202, and an end plate 203. The unit cells 201 and the spacer members 202 are alternately arranged in the X-axis direction. The end plates 203 are positioned at both ends of the power storage device 200 in the X-axis direction, and compress the stacked body including the unit cells 201 and the spacer member 202 in the X-axis direction. The end surface in the X-axis direction of the spacer member 202 has a plurality of rib-shaped portions 202A. These rib-shaped portions 202A are located at a predetermined interval in the Z-axis direction. A region sandwiched between rib-shaped portions 202 adjacent in the Z-axis direction forms a refrigerant passage through which the refrigerant flows. The spacer member 202 has a leg portion 202B. The present invention can be applied to the leg portion 202B.

  The present invention can be implemented in various other forms without departing from the spirit or main features thereof. Therefore, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. The scope of the present invention is indicated by the scope of claims, and is not restricted by the text of the specification. Further, all modifications, various improvements, alternatives and modifications belonging to the equivalent scope of the claims are all within the scope of the present invention.

1 Cell 10 Battery Case 30 Leg 30A Fastening Hole 30B-30G Hole 70 Lower Case 70A Flange 80 Fastening Bolt

Claims (9)

A power supply mounted on the vehicle;
A leg portion having a first opening through which a fastening member for fixing the power supply body to a fixed surface of the vehicle is inserted;
The legs are
A second opening located in a first direction perpendicular to the direction from the legs toward the power supply body, in the in-plane direction including the fixed surface with respect to the first opening. Power supply apparatus having a section. In the opening direction view of the first opening,
In the leg portion, a length from the second opening portion to the outer edge in the first direction is T1, and a length perpendicular to the first direction from the first opening portion is separated from the power supply body. 2. The power supply device according to claim 1, wherein when the length to the outer edge in the direction of T is T2, Equation (1) is satisfied.
T2 ≧ T1 (1)   The power supply device according to claim 2, wherein the second opening is symmetrically positioned on both sides in the first direction across the first opening. The second opening includes a first region including the first direction passing through a center of the first opening, and is orthogonal to the first direction with respect to the first region, A second region adjacent in the second direction away from the power supply body,
The power supply device according to claim 1, wherein the first region has an opening width in the first direction longer than that of the second region. In the leg portion, the length from the first opening to the outer edge in the second direction is T2, and the first and second on the first direction passing through the center of the first opening. The power supply device according to claim 4, wherein the expression (2) is satisfied when a total length other than the opening is T3.
T2 ≧ T3 (2)   The power supply device according to claim 1, wherein the power supply body is a secondary battery. The power source is
A housing member formed of resin;
An electrode body housed in the housing member;
An electrolyte contained in the housing member,
The power supply device according to claim 1, wherein the leg portion is located on an outer surface of the housing member.   A combined power supply in which a plurality of power supply devices according to claim 7 are arranged in the first direction. A power supply group in which a plurality of the power supply bodies according to claim 1 are arranged in the first direction;
A plurality of spacer members disposed between power supply bodies adjacent to each other;
An assembled power source comprising: the leg portion according to claim 1 formed on at least one of the plurality of spacer members.

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