JP2014197513A - Power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage device with a configuration that can suppress deflection of a side wall part of an enclosure of the power storage device.SOLUTION: A power storage device comprises: a power storage element 400; an enclosure 200 having at least a bottom surface 235 and a side wall part 231 extending along the z axis direction from the bottom surface 235 to an upper side; and a cell frame 300 coming in contact with the power storage element 400. The side wall part 231 is formed so that an edge at the upper side is positioned in a first region A1 which is above the edge at the upper side of the power storage element 400, and the cell frame 300 has an insertion part 301 for inserting between the side wall part 231 and an outer periphery of a container 410 of the power storage element 400 at an upper side of the container 410 of the power storage element 400; and a support part 302 extending to the upper side and facing the side wall part 231 in the first region A1.

Description

  The present invention relates to a power storage device in which a power storage element is housed in an exterior body.

  Conventionally, as shown in Patent Document 1, there is a power storage device in which a plurality of single cells are housed in an exterior body. Such an exterior body of the power storage device forms a storage space for storing a plurality of single cells and has an opening. The exterior body is typically a box-shaped member excluding one surface of a hexahedron, and more specifically has a structure in which four side wall portions extend from a rectangular bottom surface in a direction perpendicular to the bottom surface.

Japanese Patent No. 4638528

  In the technique of Patent Document 1, the exterior body has a relatively large size because it forms a space for storing a plurality of single cells. That is, the exterior body has a side wall portion having a relatively large area. For this reason, the portion of the side wall portion facing the unit cell is difficult to bend because it is supported by the unit cell, but the portion of the side wall portion not facing the unit cell (that is, the portion extending outside the unit cell) is not Because it is not supported by a single cell, it is easily deflected by external force.

  Therefore, the present invention has been made in view of such a situation, and an object thereof is to provide a power storage device having a structure capable of suppressing the deflection of the side wall portion of the exterior body of the power storage device.

  To achieve the above object, an exterior body having at least a power storage element, a bottom surface, and a side wall portion extending from the bottom surface to one side in a first direction intersecting the bottom surface, and a contact member that contacts the power storage element And the side wall has a region in which one end in the first direction is one side in the first direction rather than one end in the first direction of the plurality of power storage elements. The abutting member is formed on one side in the first direction of the plurality of storage element containers, and the outer periphery of the plurality of storage element containers and the side wall portion. And an insertion portion that extends in between, and a support portion that extends to one side in the first direction and faces the side wall portion in the first region.

  According to this, since the support part is supporting the side wall part of an exterior body in the position of a 1st area | region, it can suppress that the side wall part of an exterior body bends.

  Moreover, the said exterior body may have a cover body which has a fitting part fitted to the said side wall part further.

  According to this, an exterior body is comprised by the exterior body main body which has an opening part, and the cover body which has a fitting part fitted to the inner periphery of the opening part of an exterior body main body. Even in the exterior body having such a configuration, since the support portion can suppress the deflection of the side wall portion of the exterior body, the assembly of the exterior body body and the lid body can be facilitated.

  Moreover, the said exterior body may have a pair of said side wall part which mutually opposes, and the said support part of the said contact member may support a pair of said side wall part in said 1st area | region.

  According to this, since a support part supports a pair of side wall part which mutually opposes, the bending of two side wall parts can be suppressed by one contact member in which a support part is formed. For this reason, it is not necessary to provide a plurality of contact members for one side wall, and the number of parts can be reduced.

  Further, the insertion portion may be thinner as it goes to the other side in the first direction.

  According to this, since the thickness of the insertion portion decreases toward the other side in the first direction, it is easy to insert the contact member between the outer periphery on one side in the first direction of the plurality of power storage elements and the side wall portion. can do. For this reason, it is possible to easily arrange the contact member in a state where a plurality of power storage elements are arranged on the exterior body.

  In addition, the contact member further includes a planar portion that presses the plurality of power storage elements from one side in the first direction, the planar portion intersecting the first direction, and the support portion includes You may have an inclined surface which cross | intersects a plane part and said 1st direction.

  According to this, the inclined surface is formed so as to intersect the support portion and the flat portion. For this reason, it can prevent that a support part rotates centering around the part which a support part and a plane part cross | intersect with respect to a plane part. That is, it can suppress more reliably that the side wall part of an exterior body bends.

  Further, the insertion portion may be press-fitted between an outer periphery of the plurality of storage element containers and the side wall part in a part of one side in the first direction of the plurality of storage element containers. .

  According to this, since the insertion portion is press-fitted between the outer periphery and the side wall portion of the plurality of power storage elements on one side in the first direction of the containers of the plurality of power storage elements, when the contact member is disposed In addition, it can be fixed in a state where a force is applied to at least one of the container of the plurality of power storage elements and the side wall of the exterior body.

  According to the power storage device of the present invention, it is possible to suppress the deflection of the side wall portion of the exterior body of the power storage device.

1 is a perspective view of a power storage device according to an embodiment of the present invention. It is a disassembled perspective view of an electrical storage apparatus. It is a disassembled perspective view which shows the structure for fixing one electrical storage element to an exterior body main body. It is a perspective view which shows the state which fixed the some electrical storage element to the exterior body main body with the cell frame. FIG. 5 is a VV cross-sectional view of an assembly in which a plurality of power storage elements of FIG. 4 are fixed to an exterior body body with a cell frame.

(Knowledge that became the basis of the present invention)
The present inventor has found that the following problems occur with respect to the power storage device described in the “Background Art” column.

  Specifically, for example, in the technique of Patent Document 1, since the unit cell is accommodated in the exterior body, the portion of the exterior body that accommodates the unit cell is supported by the unit cell. For this reason, the bending of an exterior body main body can be suppressed. However, since there is no member that supports the side wall portion of the exterior body main body above the unit cell, the deflection of the side wall portion of the exterior body main body cannot be suppressed.

  As described above, when the side wall portion of the exterior body body is bent, not only the appearance of the power storage device is deteriorated, but also the following problems during assembly occur. For example, when assembling a plurality of single cells, a regulating member (inner lid) for regulating a plurality of single cells, an upper lid for closing the opening of the outer body, etc. on the outer body, Since it is narrowed by influence, it is necessary to assemble after opening the narrowed opening. For this reason, there is a problem that the assembly for inserting the cell and the inner lid, and the assembly for assembling the upper lid to fit the opening of the exterior body main body take time and production efficiency is lowered. On the other hand, if it is attempted to suppress the deflection of the side wall of the exterior body by increasing the rigidity of the side wall, a part of the material may be made of a material having high rigidity such as a metal member, or the thickness of the side wall may be increased. Manufacturing cost is increased.

  In order to solve such a problem, the power storage device according to one embodiment of the present invention is described below in order to reduce the time and effort of assembling and suppress the deflection of the side wall portion of the exterior body while suppressing the manufacturing cost. It is set as the structure demonstrated by.

  Hereinafter, embodiments will be described with reference to the drawings. Each of the embodiments described below shows a preferred specific example of the present invention. Numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of the constituent elements, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept of the present invention are described as optional constituent elements that constitute a more preferable embodiment.

(Embodiment)
FIG. 1 is a perspective view of a power storage device according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the power storage device.

  As shown in these drawings, power storage device 100 includes an exterior body 200, a cell frame 300, and a plurality (four in the present embodiment) of power storage elements 400.

  The exterior body 200 is a box-shaped member that houses the cell frame 300 and the plurality of power storage elements 400. That is, the exterior body 200 includes a bottom surface 235 (see FIG. 5) and side wall portions 231 to 234. Further, the exterior body 200 forms a storage space S1 in which the plurality of power storage elements 400 are stored. The exterior body 200 arranges a plurality of power storage elements 400 at predetermined positions, protects each power storage element 400 from impact and the like, and prevents each power storage element 400 from inadvertently contacting a metal member or the like. 220 and a lid 210. The exterior body 200 is made of an insulating material such as a resin. The exterior body 200 includes an external positive terminal 110 and an external negative terminal 120. The external positive terminal 110 and the external negative terminal 120 are terminals connected to an external load to supply power stored in the power storage device 100 to an external load, or power supplied from an external power source is stored in the power storage device. A terminal connected to an external power source for storing in 100.

  The lid 210 includes a top cover 211 and a lid body 213. In the lid 210, a space is formed between the top cover 211 and the lid body 213, and the control circuit 212 is accommodated in the space.

  The exterior body main body 220 has a bottom surface 235 and side wall portions 231 to 234, and an opening portion 225 is formed by the side wall portions 231 to 234. The exterior body main body 220 includes a pair of side wall portions 231 and 232 facing each other and a pair of side wall portions 233 and 234. The pair of side wall portions 231 and 232 extend in the Z-axis direction (vertical direction) as the first direction and cross the Z-axis direction (perpendicular in the present embodiment) along the X-axis direction as the second direction. It extends. Further, the pair of side wall portions 233 and 234 extend in the Z-axis direction, and extend in the Y-axis direction as a third direction that intersects the Z-axis direction (orthogonal in the present embodiment). The exterior body main body 220 includes a plurality of partition plates 221 for housing the plurality of power storage elements 400, respectively. That is, the plurality of power storage elements 400 are individually stored in a plurality of spaces in which the storage space S <b> 1 formed in the exterior body main body 220 is partitioned (divided) by the plurality of partition plates 221.

  The cell frame 300 is provided above the plurality of power storage elements 400. The cell frame 300 is a contact member that contacts the plurality of power storage elements 400. Further, the cell frame 300 may function as a regulating member that regulates the positions of the plurality of power storage elements. Each of the plurality of cell frames 300 bundles the upper portions of the two power storage elements 400 together. The cell frame 300 is made of an insulating material such as a resin.

  The power storage element 400 is an element that can be charged and discharged, and includes a container 410, a positive electrode terminal 420, and a negative electrode terminal 430. The container 410 is made of a conductive material (for example, metal). The positive electrode terminal 420 and the negative electrode terminal 430 protrude above the container 410. The plurality of power storage elements 400 are arranged in a line in the X-axis direction. In each of the plurality of power storage elements 400, different polarity terminals are electrically connected by a bus bar 350 that is a metal plate member. That is, the plurality of power storage elements 400 are connected in series by the bus bar 350. The plurality of power storage elements 400 connected in series by the bus bar 350 has a positive electrode side connected to the external positive electrode terminal 110 and a negative electrode side connected to the external negative electrode terminal 120.

  FIG. 3 is an exploded perspective view showing a configuration for fixing one power storage element to the exterior body. FIG. 4 is a perspective view showing a state in which a plurality of power storage elements are fixed to the exterior body with cell frames. FIG. 5 is a VV cross-sectional view of an assembly in which the plurality of power storage elements of FIG. 4 are fixed to the exterior body body with a cell frame.

  As shown in FIGS. 3 to 5, the cell frame 300 sandwiches the power storage element 400 housed in a predetermined position of the exterior body main body 220 together with the exterior body main body 220 from above. The exterior body main body 220 includes a plurality of boss portions 222 at positions where the side surface portions of the exterior body main body 220 and the partition plate 221 intersect, which are both ends in the Y-axis direction of the plurality of partition plates 221. A hole 223 for inserting an insert nut 224 is formed in the upper part of the plurality of bosses 222, and an insert nut 224 that is screwed into a bolt 310 described later is provided in the hole 223. The cell frame 300 crosses each of the plurality of power storage elements 400 via the adhesive 500 described later in the arrangement direction (X-axis direction) of the plurality of power storage elements 400 (in the present embodiment, the first direction) A plurality of (in this embodiment, ten) bolts 310 and insert nuts 224 provided on the exterior body main body 220 in a state of being sandwiched together with the bottom surface 235 of the exterior body 200 from both sides in the Z-axis direction (vertical direction). The plurality of power storage elements 400 are fixed to the exterior body main body 220 by being bonded. The cell frame 300 is formed with a plurality of through holes 305 that pass through the plurality of bolts 310. That is, the plurality of bolts 310 pass through the plurality of through holes 305 formed in the cell frame 300 and are screwed into the insert nuts 224 provided in the exterior body main body 220, so that the cell frame 300 and the exterior body are assembled. The main body 220 is joined. The plurality of bolts 310 and the insert nut 224 are joint portions for joining the cell frame 300 and the exterior body main body 220.

  Thus, when the cell frame 300 and the exterior body main body 220 are joined together by fastening the bolts 310 and the insert nuts 224, a plurality of through holes 305 through which the bolts 310 pass are formed in the support portion 302. It is arranged on the side in the X-axis direction. That is, the support portion 302 is not integrally formed over the entire width of the exterior body main body 220 in the X-axis direction, and is provided in a state of being divided into positions corresponding to the plurality of power storage elements 400. . For this reason, the through-hole 305 can be provided in the position in which the support part 302 of the cell frame 300 is not formed. Thereby, it is not necessary to provide a through-hole that penetrates the support portion, and the through-hole can be provided as compared with the case where the support portion is integrally formed over the entire width of the exterior body main body 220 in the X-axis direction. Long bolts that pass through the holes are not required. That is, by providing the through hole 305 between the support portions 302, the cost for manufacturing the power storage device 100 can be reduced.

  In addition, although the junction part by the combination of the volt | bolt 310 and the insert nut 224 is employ | adopted for joining with the cell frame 300 and the exterior body main body 220, a junction part is not restricted to this. For example, it may be joined using rivets, or a portion where the cell frame and the exterior body main body are in close contact with each other may be joined with an adhesive, or a recess is formed in one of the cell frame and the exterior body main body. In addition, a convex portion that fits the concave portion may be provided on the other side, and the concave portion and the convex portion may be joined by fitting (fitting by press-fitting), or a snap fit may be used as a joint portion between the cell frame and the exterior body body. You may make it join using.

  The lid 210 has a fitting portion 213a (see FIG. 5) that fits with the inner periphery of the opening 225 of the exterior body 220 in the lid main body 213, and closes the opening 225 with the fitting portion 213a. A storage space S <b> 1 is formed together with the exterior body 220. That is, the fitting part 213a is fitted with the side wall parts 231 to 234. In the present embodiment, the fitting portion 213a has a structure in which the side wall portions 231 to 234 of the exterior body main body 220 are sandwiched from both the outside and the inside of the exterior body main body 220. With this configuration, the airtightness between the lid 210 and the exterior body 220 can be improved. Moreover, since it is the structure which fits the side wall parts 231-234 of the exterior body main body 220 to the cover body 210, the bending of the cover body 210 can be suppressed.

  Further, the side wall portions 231 to 234 of the exterior body main body 220 have end portions in the Z-axis direction from end portions on one side (hereinafter referred to as “upper side”) of the containers 410 of the plurality of power storage elements 400 in the Z-axis direction. Is formed so as to be located in the first area A1 (that is, the area above the straight line L1 in FIG. 5) which is the upper area.

  As shown in FIG. 5, the cell frame 300 includes an insertion portion 301, a support portion 302, and a plane portion 303. The flat portion 303 is a plate-like member that is disposed on the upper surface of the container 410 of the plurality of power storage elements 400. That is, the plane portion 303 is a member that holds the plurality of power storage elements 400 from above, and intersects the Z-axis direction (in the present embodiment, it is orthogonal).

  The insertion part 301 enters between the outer periphery of the container 410 of the plurality of power storage elements 400 and the pair of side wall parts 231 and 232 on the upper side of the container 410 of the plurality of power storage elements 400. That is, the insertion portion 301 extends downward from the outer peripheral edge of the flat portion 303, and has a pair of side wall portions facing the outer surface in the Y axis direction of the container 410 of the plurality of power storage elements 400 and the Y axis direction. 231 and 232. In addition, it is preferable that the thickness of the insertion portion 301 becomes thinner toward the lower side. The insertion portion 301 includes a part of the upper side of the container 410 of the plurality of power storage elements 400 (hereinafter referred to as “upper part”), an outer periphery of the container 410 of the plurality of power storage elements 400, and a pair of side wall portions 231, 232. It is preferable to press fit between. That is, the width of the insertion portion 301 is greater than the distance between the outer periphery of the container 410 of the plurality of power storage elements 400 and the pair of side wall portions 231 and 232 in the upper part of the container 410 of the plurality of power storage elements 400.

  The support portion 302 extends upward from the insertion portion 301 and faces the pair of side wall portions 231 and 232 in the first region A1. That is, the support portion 302 extends from the outer peripheral edge of the flat portion 303 to the upper side that is the opposite side of the direction in which the insertion portion 301 extends. Thereby, the support part 302 is in contact with the pair of side wall parts 231 and 232 at a position higher than the height of the container 410 of the plurality of power storage elements 400. That is, the support portion 302 supports a pair of side wall portions 231 and 232 that are parallel to the X-axis direction, which is the arrangement direction of the plurality of power storage elements 400. That is, the support part 302 supports the side wall parts 231 and 232 corresponding to the long side surfaces of the exterior body 200.

  Moreover, it is preferable that the support part 302 has the plane part 303 and the inclined surface 304 which is a surface which cross | intersects a Z-axis direction. Further, the support portion 302 is disposed on the side of the positive electrode terminal 420 and the negative electrode terminal 430. For this reason, the support portion 302 can protect the battery terminal even when a strong external force is applied to the side wall portions 231 to 234 of the exterior body 200. In addition, since a plurality of support portions 302 are provided corresponding to each of the plurality of power storage elements 400, even if one support portion 302 is damaged by a strong external force, the other support portion 302 causes the positive terminal 420 and The negative electrode terminal 430 can be protected.

  In addition, the height of the support portion 302 is preferably a height that does not contact the lid 210. Further, it is more preferable that the support portion 302 has a height lower than the position of the fitting portion 213a of the lid 210. Thereby, since the support part 302 can be formed in the position which does not interfere, the lid 210 can be easily assembled.

(Feature)
According to power storage device 100 according to the present embodiment, since support portion 302 of cell frame 300 supports the pair of side wall portions 231 and 232 of exterior body 200 at the position of first region A1, A pair of side wall parts 231 and 232 can suppress bending of storage space S1.

  Further, by devising the shape of the cell frame 300 as a conventionally used restricting member, the deflection of the pair of side wall portions 231 and 232 of the exterior body 200 can be suppressed. This is useful in that it can be performed and there is no need to increase the number of parts for suppressing deflection.

  In addition, according to power storage device 100 according to the present embodiment, exterior body 200 includes exterior body main body 220 having opening 225 and fitting portion 213a that fits on the inner periphery of opening 225 of exterior body main body 220. And a lid 210 having Since the bending of the opening 225 of the exterior body main body 220 can be suppressed after the cell frame 300 is installed as described above, it is possible to reduce the trouble of assembling the lid 210 to the exterior body main body 220. That is, even in the case of the exterior body 200 including the combination of the lid body 210 and the exterior body body 220, the support portion 302 formed on the cell frame 300 can suppress the deflection of the pair of side wall portions 231 and 232 of the exterior body 200. Therefore, assembly of the exterior body main body 220 and the lid body 210 can be facilitated. Thereby, productivity can be improved while suppressing the manufacturing cost of the power storage device 100. Moreover, it can suppress that the external appearance by the pair of side wall parts 231 and 232 of the exterior body 200 being bent deteriorates.

  Further, according to power storage device 100 according to the present embodiment, support portion 302 of cell frame 300 supports a pair of side wall portions 231 and 232 facing each other, and thus one cell frame in which support portion 302 is formed. By 300, the deflection of the two side wall portions 231 and 232 can be suppressed. For this reason, it is not necessary to provide one regulating member for each side wall, and the number of parts can be reduced.

  Further, according to power storage device 100 according to the present embodiment, since insertion portion 301 of cell frame 300 is thinner toward the lower side, cell frame 300 is connected to the upper outer periphery of a plurality of power storage elements 400 and a pair of It can be easily inserted between the side wall portions 231 and 232. For this reason, the cell frame 300 can be easily disposed in a state where the plurality of power storage elements 400 are disposed on the exterior body 200.

  In addition, according to power storage device 100 according to the present embodiment, inclined surface 304 included in support portion 302 of cell frame 300 is formed to intersect support portion 302 and flat portion 303. For this reason, it can prevent that the support part 302 rotates centering on the part which the support part 302 and the plane part 303 cross | intersect with respect to the plane part 303. FIG. That is, it can suppress more reliably that a pair of side wall parts 231 and 232 of the exterior body 200 bend inward.

  Further, according to power storage device 100 according to the present embodiment, insertion portion 301 of cell frame 300 has an outer periphery of a plurality of power storage elements 400 and a pair of side wall portions 231 above container 410 of a plurality of power storage elements 400. 232, when the cell frame 300 is disposed, a force is applied to at least one of the container 410 of the plurality of power storage elements 400 and the pair of side wall portions 231 and 232 of the exterior body 200. Can be fixed.

(Modification)
As mentioned above, although the component mounting method of this invention was demonstrated based on embodiment, this invention is not limited to this embodiment. Unless it deviates from the meaning of this invention, the form which carried out the various deformation | transformation which those skilled in the art can think to this embodiment, and the structure constructed | assembled combining the component in different embodiment is also contained in the scope of the present invention. .

(1)
According to power storage device 100 according to the above embodiment, support portion 302 of cell frame 300 is provided with respect to the pair of side wall portions 231 and 232 facing in the Y-axis direction, but is not limited thereto. . That is, you may make it provide with respect to a pair of side wall part 233,234 facing the X-axis direction. Moreover, even if the support part 302 of the cell frame 300 is provided with respect to one side wall part, there exists an effect in the point that the bending of one side wall part can be suppressed.

(2)
According to the power storage device 100 according to the above embodiment, the fitting portion 213a has a structure in which the side wall portions 231 to 234 of the exterior body main body 220 are sandwiched from both the outside and the inside of the exterior body main body 220. Not exclusively. For example, it is good also as a fitting part of the structure fitted to the inner surface of the side wall parts 231-234 of the exterior body main body 220, or as a fitting part of the structure fitted to the outer surface of the side wall parts 231-234 of the exterior body main body 220. Also good. Moreover, what is necessary is just a structure fitted to either a pair of side wall parts 231,232 and a pair of side wall parts 233,234.

(3)
According to power storage device 100 according to the above embodiment, support portion 302 supports the pair of side wall portions 231 and 232, but does not necessarily have to be in a supported state. That is, it does not need to be in a state where it is in contact with the pair of side wall portions of the exterior body main body, and is not limited to this because the effect of suppressing the deflection can be realized if the side wall portions are disposed at positions where the side wall portions can be prevented from being bent.

  The present invention is useful as a power storage device that can suppress the deflection of the side wall portion of the exterior body.

100 power storage device 110 external positive terminal 120 external negative terminal 200 exterior body 210 lid body 211 top cover 212 control circuit 213 lid body 213a fitting portion 220 exterior body body 221 partition plate 222 boss portion 223 hole portion 224 insert nut 225 opening portion 231 232, 233, 234 Side wall portion 235 Bottom surface 300 Cell frame 301 Insertion portion 302 Support portion 303 Flat portion 304 Inclined surface 305 Through hole 350 Bus bar 400 Power storage element 410 Container 420 Positive electrode terminal 430 Negative electrode terminal

Claims (6)

A storage element;
An exterior body having at least a bottom surface and a side wall portion extending from the bottom surface to one side in a first direction intersecting the bottom surface;
A contact member that contacts the power storage element;
With
The side wall portion is positioned in a first region where an end portion on one side in the first direction is a region on one side in the first direction rather than an end portion on the one side in the first direction of the power storage element. Formed to
The contact member is
On one side in the first direction of the container of the storage element, an insertion part that enters between the outer periphery of the container of the storage element and the side wall part,
A power storage device that extends to one side in the first direction and includes a support portion that faces the side wall portion in the first region. The power storage device according to claim 1, wherein the exterior body further includes a lid body having a fitting portion that is fitted to the side wall portion. The exterior body has at least a pair of the side wall portions facing each other,
The power storage device according to claim 1, wherein the support portion of the contact member supports the pair of side wall portions in the first region. The power storage device according to any one of claims 1 to 3, wherein the insertion portion is thinner toward the other side in the first direction. The contact member further includes:
A plane part that holds the power storage element from one side in the first direction, and has a plane part that intersects the first direction;
The power storage device according to any one of claims 1 to 4, wherein the support portion includes an inclined surface that intersects the planar portion and the first direction. The insertion section is press-fitted between an outer periphery of the container of the electricity storage element and the side wall part at a part of one side in the first direction of the container of the electricity storage element. 2. The power storage device according to item 1.

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