JP6301772B2 - Power storage device - Google Patents

Description

  The present invention relates to a power storage device including a power storage element.

  Conventionally, an assembled battery including a plurality of battery cells is known (see Patent Document 1). Specifically, the battery pack includes a battery stack in which a plurality of battery cells are stacked in a predetermined direction, a pair of end plates disposed on both end surfaces in the stacking direction of the battery stack, and a pair of end plates. And a bind bar that integrally connects the plurality of battery cells. In this assembled battery, a separator is disposed between the battery stack and the end plate, that is, between the outermost battery cell and the end plate in the stacking direction.

  The end plate extends in a planar direction perpendicular to the stacking direction of the battery cells, and presses the separator against the outermost battery cell. At this time, the end plate presses the separator against the outermost battery cell with a substantially uniform force at each position in the planar direction.

  The separator has a rectangular wave-shaped cross-sectional shape. Therefore, when the separator is pressed against the outermost battery cell by the end plate, a ventilation gap is formed between the outermost battery cell and the separator. Although heat is generated in the battery cell when the assembled battery is used, the battery cell can be cooled by circulating a cooling gas through the air blowing gap.

  When charging / discharging of each battery cell is repeated in the assembled battery, the electrode body accommodated in the case of the battery cell expands and the central portion of the battery cell (case) expands. As described above, the end plate presses the separator against the outermost battery cell with a substantially uniform force at each position in the planar direction. For this reason, when the central part of the battery cell bulges, the pressing force of the end plate against the peripheral part of the separator from the end plate is reduced, and the cooling gas flowing through the air gap is easily leaked to the outside.

JP 2012-123905 A

  In view of the above, an object of the present invention is to provide a power storage device in which a cooling fluid is unlikely to leak to the outside from a ventilation path formed between an external spacer and a power storage element.

The power storage device according to the present invention includes:
At least one power storage element;
An external spacer adjacent to the power storage element, the first spacer facing the power storage element and an external spacer having a second surface opposite to the first surface ;
A termination member disposed so as to sandwich the external spacer between the storage element, and
The external spacer is a base that extends along the adjacent power storage element, and forms a ventilation path through which cooling fluid can flow between the base and the power storage element, and protrudes from the base to contact the power storage element. A seal part that prevents leakage of the cooling fluid from the ventilation path by contacting,
The termination member is a pressing portion provided at a position corresponding to the sealing portion, and a pressing portion that presses the sealing portion toward the power storage element via the base, and a portion adjacent to the pressing portion. And having a recess formed in the direction from the first surface toward the second surface .

  According to this configuration, the outer spacer is partially pressed by the pressing portion (that is, only the portion corresponding to the sealing portion in the outer spacer is pressed) to press the sealing portion against the power storage element, resulting in deformation of the power storage element or the like. Even if deformation of the external spacer, change in the posture of the external spacer with respect to the termination member, etc. occur, the seal portion is compared with the termination member that presses the external spacer against the electrical storage element with a substantially uniform force at each position in the direction along the electrical storage element. Sufficient pressing force is applied to the cooling fluid, which makes it difficult for the cooling fluid to leak from the ventilation path.

in this case,
It is preferable that the pressing portion extends along the base and includes an edge of the termination member.

  According to such a configuration, since the pressing portion is provided at the peripheral edge portion (the portion including the edge) of the termination member, the pressing portion and the seal portion of the external spacer are arranged on the surface facing the external spacer of the energy storage device. It can be provided at the peripheral portion, and thereby, it is possible to suppress the influence on the pressing portion and the seal portion due to the bulging of the central portion of the electric storage element (the facing surface) caused by repeated charging and discharging. For this reason, even when the bulging occurs, the seal portion can be sufficiently adhered to the power storage element by the pressing force from the pressing portion, and as a result, the cooling fluid is hardly leaked from the ventilation path.

In the power storage device,
It is preferable that the external spacer has a protrusion protruding toward the pressing portion from a position corresponding to the seal portion in the base.

  According to such a configuration, a pressing force is applied to the protrusion provided at a position corresponding to the seal portion in the base, so that the pressing force is efficiently transmitted to the seal portion, whereby the seal portion and the storage element are sufficiently connected. The cooling fluid is more difficult to leak from the ventilation path by close contact.

in this case,
The pressing portion has an opposing surface that faces the base and contacts the protrusion;
More preferably, the contact area of the protrusion with the pressing portion is smaller than the area of the facing surface.

  According to such a configuration, since the contact area between the external spacer and the pressing portion is further suppressed, the influence of the deformation of the power storage element on the seal portion and the pressing portion is further suppressed, thereby causing the power storage element to be deformed. However, sufficient adhesion between the seal portion and the power storage element is maintained, and the cooling fluid is difficult to leak from the ventilation path.

In the power storage device,
The seal part and the pressing part may extend in the flow direction of the cooling fluid in the ventilation path.

  According to such a configuration, it is possible to prevent the cooling fluid from leaking to the outside over the entire flow direction in the ventilation path.

In the power storage device,
The termination member may include a main body that extends along the base, and a support portion that supports the pressing portion and extends from the main body toward the external spacer.

  According to such a configuration, since the support portion extends from the main body extending along the base to the main body, the rigidity of the termination member is improved.

in this case,
The pressing portion may extend from the tip of the support portion toward the periphery of the base.

  According to this configuration, even if the seal portion is provided on the peripheral portion of the base, the seal member can be pressed by the pressing portion without the termination member protruding from the peripheral edge of the external spacer. For this reason, without enlarging the power storage device, the power storage element and the seal portion can be firmly adhered to each other at the peripheral portion of the surface of the power storage element facing the external spacer, thereby cooling the air passage from the ventilation path to the outside. The arrangement | positioning (formation) area | region of the ventilation path which touches the said opposing surface can be enlarged, preventing the leakage of a fluid. As a result, it is possible to improve the cooling efficiency of the power storage element while preventing an increase in the size of the power storage device.

  As described above, according to the present invention, it is possible to provide a power storage device in which the cooling fluid is unlikely to leak to the outside from the ventilation path formed between the external spacer and the power storage element.

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 in a state where a part of the configuration of the power storage device is omitted. FIG. 3 is an exploded perspective view in a state where a part of the configuration of the power storage device is omitted. FIG. 4 is a perspective view of a power storage element in the power storage device. FIG. 5 is a front view of the electricity storage element. FIG. 6 is a partial cross-sectional view of the power storage device. FIG. 7 is a cross-sectional view of the seal portion of the external spacer and the pressing portion of the termination member and the periphery thereof in the power storage device. FIG. 8 is a perspective view of the termination member. FIG. 9 is a perspective view of the termination member. FIG. 10 is a cross-sectional view for explaining the effect of the pressing portion of the external spacer. FIG. 11 is a cross-sectional view for explaining the effect of the pressing portion of the external spacer.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In addition, the name of each component (each component) of this embodiment is a thing in this embodiment, and may differ from the name of each component (each component) in background art.

  As shown in FIGS. 1 to 3, the power storage device includes a power storage element 1, a spacer 2 adjacent to the power storage element 1, and a holding member 3 that holds the power storage element 1 and the spacer 2 together. The holding member 3 is formed of a conductive material. Accordingly, the power storage device includes an insulator 4 that insulates between the power storage element 1 and the holding member 3. The insulator 4 is disposed between the power storage element 1 and the holding member in the power storage device.

  As shown in FIGS. 4 and 5, the power storage element 1 includes an unillustrated electrode body including a positive electrode and a negative electrode, a case 10 that houses the electrode body, and a pair of external terminals disposed on the outer surface of the case 10. 11.

  The case 10 includes a case main body 100 having an opening, and a cover plate 101 that closes the opening of the case main body 100, and a pair of external terminals 11 are disposed on the outer surface.

  The case main body 100 includes a closing part 100a (see FIG. 3) and a cylindrical body part 100b connected to the periphery of the closing part 100a so as to surround the closing part 100a.

  The trunk portion 100b includes a pair of first walls 100c that face each other with a space therebetween, and a pair of second walls 100d that face each other across the pair of first walls 100c.

  Each of the first wall 100c and the second wall 100d is formed in a rectangular shape. That is, each surface of the first wall 100c and the second wall 100d is a rectangular flat surface. The first wall 100c and the second wall 100d are arranged adjacent to each other with their edges abutted against each other. The edge of the adjacent first wall 100c and the edge of the second wall 100d are connected over the entire length. Thereby, the trunk | drum 100b is formed in the square cylinder shape. One end of the trunk portion 100b is closed by the closing portion 100a. On the other hand, the other end of the body part 100b in the case body 100 is open. This opening is closed by the cover plate 101. In the present embodiment, the surface area of the first wall 100c is larger than the surface area of the second wall 100d. For this reason, the trunk | drum 100b is a flat square tube shape.

  The power storage device according to the present embodiment includes a plurality of power storage elements 1. Each of the plurality of power storage elements 1 is aligned in one direction. In the present embodiment, each of the plurality of power storage elements 1 is aligned with the first wall 100c of the case 10 oriented in one direction. The power storage device includes an unillustrated bus bar that electrically connects the external terminals 11 of two adjacent power storage elements 1.

  In the following description, for convenience, the direction (first direction) in which the power storage elements 1 are aligned is referred to as the X-axis direction. In a coordinate system (orthogonal coordinate system) in which the three axes are orthogonal to each other, one direction (second direction) of the two axial directions orthogonal to the direction in which the storage elements 1 are aligned (X-axis direction) is the Y-axis direction. The remaining one direction (third direction) is called the Z-axis direction. Accordingly, in each drawing, three orthogonal axes (coordinate axes) corresponding to the X-axis direction, the Y-axis direction, and the Z-axis direction are supplementarily illustrated.

  The spacer 2 has an insulating property. The spacer 2 includes a base adjacent to the power storage element 1 (specifically, the case 10, more specifically, the first wall 100c of the body part 100b), and a restricting portion that prevents displacement of the power storage element 1 adjacent to the base. Have

  The spacer 2 will be described more specifically. The power storage device includes a plurality of power storage elements 1 as described above. Accordingly, the power storage device includes two types of spacers 2 (2A and 2B) as shown in FIGS. That is, the power storage device includes a spacer (hereinafter referred to as an internal spacer) 2A disposed between two power storage elements 1 and a spacer (hereinafter referred to as an external) adjacent to the power storage element 1 at the end of the plurality of power storage elements 1. 2B).

  First, the inner spacer 2A will be described. The internal spacer 2A includes a base 20A adjacent to the power storage element 1 (the first wall 100c of the case body 100) and a restricting portion 21A that suppresses a positional shift of the power storage element 1 adjacent to the base 20A with respect to the base 20A. Further, the inner spacer 2A is a valve cover portion 22A protruding from the base 20A, and has a valve cover portion 22A disposed on the cover plate 101 (gas discharge valve 101a) of the electricity storage element 1.

  Base 20A of internal spacer 2A (hereinafter simply referred to as “base 20A”) is sandwiched between two power storage elements 1. That is, the power storage elements 1 are respectively disposed on both sides of the base 20A in the X-axis direction. The base 20A extends in a direction orthogonal to the X-axis direction. The base 20 </ b> A is a first surface facing one of the two adjacent power storage elements 1 and a second surface opposite to the first surface, and includes two power storage elements 1. And the second surface facing the other power storage element 1. The base 20A has a substantially rectangular shape when viewed in the X-axis direction. Further, the base 20 </ b> A is approximately the same size (corresponding) as the first wall 100 c of the electricity storage device 1.

  In the power storage device according to the present embodiment, a cooling fluid (for cooling) is provided between at least one of the first surface of the base 20A and the power storage element 1 and between the second surface of the base 20A and the power storage element 1. The ventilation path for passing (circulating) the fluid is formed.

  The cross section of the base 20A of the present embodiment has a rectangular wave shape. This will be described more specifically. The base 20 </ b> A contacts the first contact portion 200 </ b> A that contacts only one of the two adjacent storage elements 1 and only the other storage element 1 of the two adjacent storage elements 1. It has the 2nd contact part 200B and the connection part 200C which connects the 1st contact part 200A and the 2nd contact part 200B. The first contact portion 200A is long in the Y-axis direction. The second contact portion 200B is long in the Y-axis direction.

  The base 20A of the present embodiment includes a plurality of first contact portions 200A and a plurality of second contact portions 200B. The first contact portions 200A and the second contact portions 200B are alternately arranged in the Z-axis direction. Thus, in the power storage device, a ventilation path is formed by the surface of the first contact portion 200A opposite to the surface that contacts the power storage element 1 and the pair of connection portions 200C connected to the first contact portion 200A. Is done. In the power storage device, a ventilation path is formed by the surface of the second contact portion 200B opposite to the surface that contacts the power storage element 1 and the pair of connection portions 200C connected to the second contact portion 200B. The

  The restricting portion 21A suppresses (regulates) displacement in the YZ plane (plane including the Y axis and Z axis) direction with respect to the inner spacer 2A (base 20A) of the power storage element 1 on both sides in the X axis direction. Thereby, 21 A of control parts can control the relative movement of the two electrical storage elements 1 adjacent to 2 A of internal spacers. Specifically, the restricting portion 21A extends from the base 20 to both sides in the X-axis direction. That is, the restricting portion 21A extends from the base 20A toward the power storage element 1 adjacent to the first surface of the base 20A of the inner spacer 2A and toward the power storage element 1 adjacent to the second surface of the base 20A of the inner spacer 2A. Extending from the base 20A. When the restricting portion 21 </ b> A comes into contact with the power storage element 1, a positional shift in the YZ plane direction of the power storage element 1 with respect to the base 20 </ b> A is suppressed.

  As described above, the power storage device according to the present embodiment includes a plurality of power storage elements 1, and the internal spacers 2 </ b> A are disposed between the adjacent power storage elements 1. That is, the power storage device includes a plurality of internal spacers 2A.

  Next, the outer spacer 2 </ b> B will be described with reference to FIGS. 1 to 3, 6, and 7. The outer spacer 2B includes a base 20B arranged so as to be aligned with the power storage element 1, and a regulation portion 21B that suppresses a positional shift of the power storage element 1 adjacent to the base 20B with respect to the base 20B. The external spacer 2B of the present embodiment has a seal portion 25B that protrudes from the base 20B toward the power storage element 1. The outer spacer 2B also has a protrusion 26B that protrudes from the base 20B toward the terminal member 30.

  A base 20 </ b> B (hereinafter simply referred to as “base 20 </ b> B”) of the outer spacer 2 </ b> B forms a ventilation path 205 </ b> B through which a cooling fluid can flow with the power storage element 1. The base 20B extends along the power storage element 1 (specifically, the first wall 100c of the case body 100). Base 20 </ b> B has a first surface facing power storage element 1 (specifically, first wall 100 c of case body 100), and a second surface opposite to the first surface.

  In the external spacer 2 </ b> B according to the present embodiment, the base 20 </ b> B and a termination member 30 described later of the holding member 3 are opposed to each other. That is, the external spacer 2 </ b> B of the present embodiment is disposed between the electricity storage element 1 and the termination member 30. Accordingly, the outer spacer 2B has a fitting portion 22B that fits the termination member 30 at a position facing the termination member 30 of the base 20B. That is, the outer spacer 2B is a fitting portion 22B for determining the position of the termination member 30 with respect to the base 20B, and has a fitting portion 22B formed on the second surface of the base 20B. The outer spacer 2B is a shaft portion 23B for determining the position of the termination member 30 with respect to the base 20B, and has a shaft portion 23B protruding from the second surface of the base 20B.

  The external spacer 2B is a first protrusion 24B that protrudes from the second surface of the base 20B toward the end member 30, and has a first protrusion (hereinafter referred to as an external contact portion) 24B that contacts the end member 30. . The external contact portion 24 </ b> B protrudes from the base 20 </ b> B of the external spacer 2 </ b> B toward the termination member 30 and is in contact with the termination member 30. Therefore, in the power storage device, a gap is formed between the external spacer 2 </ b> B and the termination member 30. In addition, the external spacer 2B of the present embodiment is a second protrusion 201B that protrudes from the first surface of the base 20B toward the power storage element 1, and is a second protrusion (hereinafter referred to as an internal protrusion) that contacts the power storage element 1. 201B).

  The base 20B of the outer spacer 2B extends in the YZ plane direction. That is, the base 20B is formed in a plate shape. The base 20B has a substantially rectangular shape when viewed in the X-axis direction. Further, the base 20 </ b> B is approximately the same size (corresponding) as the first wall 100 c of the electricity storage device 1.

  Between the first surface of the base 20B and the power storage element 1, an air passage 205B for allowing the cooling fluid to pass is formed. More specifically, the base 20B has an internal contact portion 201B that extends from the first surface of the base 20B toward the case 10 of the power storage device 1 (specifically, the first wall 100c of the case body 100).

  The internal contact portion 201B extends in the Y-axis direction. That is, the internal contact portion 201B has a protruding shape that protrudes from the base 20B in the X-axis direction and extends in the Y-axis direction. The base 20B according to the present embodiment has a plurality of internal contact portions 201B. And each of the some internal contact part 201B is arrange | positioned at intervals in the Z-axis direction (direction orthogonal to the longitudinal direction of the internal contact part 201B). Thereby, a plurality of ventilation paths 205B are formed between the base 20B of the outer spacer 2B and the power storage element 1.

  The seal portion 25B protrudes from the base 20B and contacts the power storage element 1 adjacent to the base 20B, thereby preventing leakage of the cooling fluid from the ventilation path 205B to the outside (outside of the power storage device). The seal portions 25B are provided at both ends in the Z-axis direction of the base 20B. That is, the outer spacer 2B has two seal portions 25B. The seal portion 25B of the present embodiment is provided outside the outermost internal contact portion 201B in the Z-axis direction. This seal portion 25B extends in the Y-axis direction. That is, the seal portion 25B has a protruding shape that protrudes from the base 20B in the X-axis direction and extends in the Y-axis direction. The seal portion 25B of the present embodiment extends along the flow direction of the cooling fluid (the Y-axis direction in the example of the present embodiment) in the ventilation path 205B formed between the base 20B and the power storage element 1.

  The seal portion 25B is disposed at a distance from the internal contact portion 201B in the Z-axis direction. A space surrounded by the internal contact portion 201B, the seal portion 25B, the base 20B, and the power storage element 1 (specifically, the first wall 100c) may be used as the ventilation path 205B. When the enclosed space is used as the ventilation path 205B, the seal portion 25B is located at the end of the ventilation path 205B. On the other hand, when the enclosed space is not used as the ventilation path 205B, the seal portion 25B is located outside the ventilation path 205B in the Z-axis direction.

The seal portion 25 </ b> B has a property of bending when it comes into contact with the power storage element 1. Further, in the seal portion 25B, the protruding length from the base 20B before contacting the power storage element 1 is longer (larger) than the protruding length of the internal contact portion 201B. Therefore, by bringing the internal contact portion 201B and the energy storage device 1 into contact, the seal portion 25B is in close contact with the energy storage device 1 and prevents leakage of the cooling fluid. The seal portion 25B of the present embodiment has a shape that becomes thinner toward the tip. Therefore, the seal portion 25 </ b> B is more easily bent when it comes into contact with the power storage element 1.

  The protrusion 26B protrudes in a direction opposite to the seal portion 25B from a position corresponding to the seal portion 25B in the base 20B (a position overlapping in the X-axis direction in the present embodiment). The protrusion 26 </ b> B of the present embodiment protrudes toward the end member 30 such that the tip in the protruding direction contacts (contacts) the end member 30. This protrusion 26B extends in the Y-axis direction. That is, the protrusion 26B has a protruding shape that protrudes from the base 20B in the X-axis direction and extends in the Y-axis direction at a position overlapping the seal portion 25B in the X-axis direction. For this reason, the protrusion 26B of the present embodiment extends along the flow direction of the cooling fluid in the ventilation path 205B, similarly to the seal portion 25B. Thus, the seal portion 25B and the protrusion 26B overlap in the X-axis direction, so that the force pressed by the end member 30 (force in the direction toward the power storage element 1 in the X-axis direction: pressing force) is the protrusion 26B. Is efficiently transmitted to the seal portion 25B.

  The restricting portion 21B restricts displacement (relative movement) of the power storage element 1 adjacent to the first surface of the outer spacer 2B with respect to the base 20B. The restricting portion 21B extends from the base 20B toward the power storage element 1 adjacent to the first surface of the base 20B. When the restricting portion 21 </ b> B comes into contact with the power storage element 1, the displacement of the power storage element 1 in the YZ plane direction with respect to the base 20 </ b> B is suppressed (restricted).

  The power storage device of the present embodiment includes a pair of external spacers 2B configured as described above. The outer spacer 2 </ b> B is adjacent to the power storage element 1 at the end of the plurality of power storage elements 1. That is, a pair of external spacers 2B are provided so as to sandwich a plurality of aligned power storage elements 1 in the X-axis direction.

  As shown in FIGS. 1 and 2, the holding member 3 includes a pair of termination members 30 disposed at positions adjacent to the external spacers 2 </ b> B, and a frame 31 that connects each of the pair of termination members 30. Is provided.

  Each of the pair of termination members 30 extends along the power storage element 1 (specifically, the first wall 100c). Termination member 30 has a first surface facing outer spacer 2B and a second surface opposite to the first surface. As shown in FIGS. 6 to 9, the termination member 30 of the present embodiment has a plurality (four in the present embodiment) of through holes 300 b formed at each corner. Each of the termination members 30 includes a flat plate-like main body 301 and a press-contact portion 300 that bulges from the main body 301 toward the power storage element 1. The pressure contact portion 300 contacts the external contact portion 24B extending from the base 20B of the external spacer 2B. The pressure contact portion 300 has an insertion hole 300a formed at a position corresponding to the shaft portion 23B of the outer spacer 2B. The termination member 30 of the present embodiment includes a pressing portion 302 that presses the seal portion 25B toward the power storage element 1 via the base 20B. Moreover, the termination | terminus member 30 has the support part 303 which supports the press part 302. FIG.

  The support portion 303 extends from the periphery of the main body 301 toward the external spacer 2B (specifically, the base 20B), and has a pressing portion 302 at the tip (an edge on the external spacer 2B side). The support portions 303 of the present embodiment are provided at both ends of the main body 301 in the Z-axis direction. The support portion 303 is a piece that extends in the X-axis direction and extends in the Y-axis direction. Specifically, the support portion 303 is a rectangular (band-like) portion that is long in the Y-axis direction. The support portion 303 is provided at a position corresponding to the seal portion 25B, that is, a position overlapping with both end portions in the Z-axis direction of the base 20B in the X-axis direction.

  The pressing portion 302 extends along the base 20 </ b> B and includes the end edge of the termination member 30. Specifically, the pressing portion 302 is directed from the tip of the support portion 303 (the edge on the base 20B side) toward the periphery of the base 20B (in the example of this embodiment, the periphery of the base 20 in the YZ plane direction). Extend. The pressing part 302 and the support part 303 of this embodiment are integrally formed by bending a rectangular plate-shaped part. That is, the support part 303 and the pressing part 302 are substantially L-shaped when viewed in the Y-axis direction (see FIG. 6). The pressing portion 302 of the present embodiment is a piece that extends in the Y-axis direction and extends in the Z-axis direction. Specifically, the pressing portion 302 is a rectangular (band) portion that is long in the Y-axis direction. The pressing portion 302 is disposed at a position overlapping the protruding portion 26B (seal portion 25B) in the X-axis direction, and abuts on the leading end portion in the protruding direction of the protruding portion 26B. The width of the pressing portion 302 in the Z-axis direction is larger than the width of the contact portion (contact portion) with the pressing portion 302 in the protrusion 26B of the base 20B. That is, the contact area of the protrusion 26B with the pressing portion 302 is a surface facing the base 20B that extends along the base 20B in the pressing portion 302 (in the YZ plane direction in the example of the present embodiment) (the protrusion 26B). Is smaller than the area of 302B. The facing surface 302B of the present embodiment extends in the YZ plane direction. In addition, the facing surface 302B of the present embodiment is substantially at the same position as the tip position in the bulging direction of the pressure contact portion 300 in the X-axis direction. In the X-axis direction, the facing surface 302B and the tip position of the pressure contact portion 300 do not have to be the same.

  As described above, in the power storage device, the cross-sectional shape of the portion adjacent to the pressing portion 302, that is, the cross-sectional shape from the pressure contact portion 300 to the main body 301 and the support portion 303 is as shown in FIG. The first surface side is an opening and is a recess recessed in the direction from the first surface to the second surface. As described above, since the concave portion is formed in the portion adjacent to the pressing portion 302, the force by which the pressing portion 302 presses the base 20B is not easily transmitted to the portion other than the portion corresponding to the seal portion 25B in the base 20B. .

  Further, as described above, the pressing portion 302 presses the base 20B by adopting a configuration in which the pressing portion 302 and the portion in contact with the base 20B in the pressure contact portion 300 are not directly connected (that is, independent). The force and the force with which the press contact part 300 presses the base 20B can be set to different magnitudes. That is, depending on the setting of the length of the support portion 303 in the X-axis direction, the pressing portion 302 presses the seal portion 25B via the base 20B, and the pressing portion 300 presses the power storage element 1 via the base 20B. Can be of different sizes.

  As shown in FIGS. 1 and 2, the frame 31 has a plurality of connecting portions extending between the pair of termination members 30. The frame 31 of the present embodiment includes a pair of first connection portions 310 disposed at positions corresponding to the cover plate 101 of the power storage element 1 and a pair of first connection portions disposed at positions corresponding to the closing portions 100a of the power storage element 1. And two connection portions 311. Further, the frame 31 has a fixing portion 313 that is connected to the terminal member 30.

  Each of the pair of first connection portions 310 has a first end in the longitudinal direction and a second end opposite to the first end. Each of the pair of second connection portions 311 has a first end in the longitudinal direction and a second end opposite to the first end.

  The fixing portion 313 includes a pair of first fixing portions 313a formed at the first ends and the second ends of the pair of first connection portions 310, and a first end of the pair of second connection portions 311, respectively. It has a pair of 2nd fixing | fixed part 313b formed in a 2nd end.

  One first fixing portion 313a opposes the peripheral portion of the through hole 300b in the one end member 30 in the X-axis direction. The other first fixing portion 313a faces the peripheral portion of the through hole 300b in the other end member 30 in the X-axis direction. And each of a pair of 1st fixing | fixed part 313a has the 1st hole part 313c formed in the position corresponding to the through-hole 300b. The first connection portion 310 is coupled to the termination member 30 by screwing a nut into a bolt inserted into the through hole 300b of the termination member 30 and the first hole 313c of the first fixing portion 313a.

  The one second fixing portion 313b faces the peripheral portion of the through hole 300b in the one end member 30 in the X-axis direction. The other second fixing portion 313b faces the peripheral portion of the through hole 300b in the other end member 30 in the X-axis direction. And each of a pair of 2nd fixing | fixed part 313b has the 2nd hole part 313d formed in the position corresponding to the through-hole 300b. The second connection portion 311 is coupled to the termination member 30 by screwing a nut into a bolt inserted into the through hole 300b of the termination member 30 and the second hole 313d of the second fixing portion 313b.

  The insulator 4 is made of an insulating material. The insulator 4 includes a pair of first insulating portions 40 disposed between each of the pair of first connection portions 310 and the power storage element 1, each of the pair of second connection portions 311, and the power storage element 1. And a pair of second insulating portions 41 disposed between the two.

  According to the above power storage device, the outer spacer 2B is partially pressed by the pressing portion 302 (that is, only the portion corresponding to the seal portion 25B in the outer spacer 2B) to press the seal portion 25B against the power storage element 1. For this reason, even if the deformation of the external spacer 2B due to the deformation of the power storage element 1 or the like, the change in the posture of the external spacer 2B with respect to the termination member 30, etc. occur, a substantially uniform force at each position in the direction along the power storage element 1 Thus, a sufficient pressing force (force in the X-axis direction) is applied to the seal portion 25B as compared with the terminal member that presses the external spacer 2B against the power storage element 1. Thereby, in the power storage device of the present embodiment, it is difficult for the cooling fluid to leak from the ventilation path 205B to the outside of the power storage device.

  In addition, since the pressing portion 302 is provided at the peripheral edge portion (the portion including the edge) of the termination member 30, the pressing portion 302 and the seal portion 25B of the external spacer 2B are connected to the external spacer 2B of the power storage element 1. It can be provided at the peripheral edge of the opposing surface (the surface of the first wall 100c). Thereby, the influence on the press part 302 and the seal | sticker part 25B by the swelling of the center part of the electrical storage element 1 (the said opposing surface) which arises by repetition of charging / discharging can be suppressed. For this reason, even when the bulge occurs, the seal portion 25B can be sufficiently adhered to the power storage element 1 by the pressing force from the pressing portion 302, and as a result, the cooling fluid is hardly leaked from the ventilation path 205B.

  In the power storage device of the present embodiment, the protrusion 26B protrudes toward the pressing portion 302 from a position corresponding to the seal portion 25B in the base 20B. Accordingly, the pressing force by the pressing portion 302 is applied to the protruding portion 26B provided at a position corresponding to the sealing portion 25B in the base 20B, and thus is effectively transmitted to the sealing portion 25B. As a result, the seal portion 25B and the electricity storage element 1 are sufficiently in close contact with each other, and the cooling fluid is more difficult to leak from the ventilation path 205B.

  In the power storage device of the present embodiment, the contact area between the protruding portion 26B and the pressing portion 302 is smaller than the area of the opposing surface 302B of the pressing portion 302, so that the contact area between the external spacer 2B and the pressing portion 302 is further suppressed. Thereby, the influence of the deformation | transformation etc. of the electrical storage element 1 to the seal | sticker part 25B and the press part 302 is suppressed more. As a result, even when deformation or the like occurs in the power storage element 1, sufficient adhesion between the seal portion 25B and the power storage element 1 is maintained, and the cooling fluid is unlikely to leak from the ventilation path 205B.

  In the power storage device of the present embodiment, the seal portion 25B and the pressing portion 302 extend in the flow direction of the cooling fluid in the ventilation path 205B (Y-axis direction in the example of the present embodiment). For this reason, in the power storage device, it is possible to prevent leakage of the cooling fluid to the outside over the entire flow direction in the ventilation path 205B.

  In the power storage device of the present embodiment, the pressing portion 302 extends toward the periphery of the base 20B from the tip of the support portion 303 that extends from the periphery of the main body 301 toward the external spacer 2B. For this reason, even if the seal portion 25B is provided on the peripheral portion of the base 20B, the end member 30 can press the seal portion 25B by the pressing portion 302 without protruding from the peripheral portion of the external spacer 2B. Specifically, it is as follows.

  The support portion 303 and the pressing portion 302 are formed by bending a metal plate-like member with a press or the like. In this case, since the plate-like member has a thickness that ensures a predetermined strength, the bent portion (the boundary portion between the support portion 303 and the pressing portion 302) is not a right angle but is curved. It becomes. For this reason, as shown in FIGS. 10 and 11, the pressing portion 302 </ b> C is formed by bending so that the cross section is V-shaped or U-shaped, or the base 20 </ b> B in the YZ plane direction from the tip of the support portion 303. When the pressing portion 302D and the like are formed so as to extend toward the inner side of the base 20B, when the seal portion 25B is provided at the peripheral edge (near the peripheral edge) of the base 20B, the termination member 30 protrudes from the peripheral edge of the base 20B (FIGS. 10 and 11 α).

  Therefore, according to the termination member 30 of the present embodiment, the power storage device 1 is sealed with the power storage device 1 at the peripheral portion of the surface facing the external spacer 2B (the surface of the first wall 100c) without enlarging the power storage device. The part 25B can be firmly adhered. Thereby, the arrangement | positioning area | region of the ventilation path 205B which touches the said opposing surface can be enlarged, preventing the leakage of the cooling fluid to the exterior from the ventilation path 205B. As a result, it is possible to improve the cooling efficiency of the power storage element 1 while preventing an increase in the size of the power storage device.

  In addition, the electrical storage apparatus which concerns on this invention is not limited to the said one Embodiment, Of course, in the range which does not deviate from the summary of this invention, various changes are made.

  In the power storage device of the above embodiment, the pressing portion 302 continuously extends in the flow direction of the cooling fluid (in the example of the above embodiment, the Y-axis direction), but is not limited to this configuration. If the seal portion 25B can be pressed toward the power storage device 1 so that the seal portion 25B and the power storage device 1 (specifically, the first wall 100c) are in close contact with each other so that the cooling fluid does not leak outside the power storage device, the pressing portion 302 is , And may extend intermittently in the distribution direction.

  The specific shape of the facing surface 302B of the pressing portion 302 in the termination member 30 is not limited. The facing surface 302B of the pressing portion 302 in the above embodiment is a flat surface extending in the YZ direction, but may be a curved surface, for example. The facing surface 302B may have a shape that can press the position corresponding to the protruding portion 26B or the sealing portion 25B of the base 20B (the position overlapping the sealing portion 25B in the X-axis direction) toward the power storage element 1.

  The power storage device of the above embodiment has the protrusion 26B that protrudes in a direction opposite to the seal portion 25B from a position overlapping the seal portion 25B in the base 20B in the X-axis direction, but is not limited to this configuration. For example, the base 20B may not include the protrusion 26B. In this case, it is preferable that the termination | terminus member 30 is provided with the protrusion which goes to the base 20B from the press part 302. FIG. Even with such a configuration, a sufficient pressing force can be applied to the seal portion 25B. Further, it is more preferable that the protrusion is disposed at a position overlapping the seal portion 25B in the X-axis direction. According to this configuration, it is possible to effectively apply a pressing force to the seal portion 25B.

  The width in the Z-axis direction of the protrusion 26B of the above embodiment is smaller than the width in the Z-axis direction of the facing surface 302B of the pressing portion 302, that is, the contact area of the protrusion 26B with the pressing portion 302 (facing surface 302B) is Although it is smaller than the area of the facing surface 302B, it is not limited to this configuration. The width of the protrusion 26B in the Z-axis direction may be larger than the width of the facing surface 302B of the pressing portion 302 in the Z-axis direction. In this case, the contact area of the protrusion 26 </ b> B with the pressing portion 302 (opposing surface 302 </ b> B) is the same as the opposing surface 302 </ b> B of the pressing portion 302. Also with this configuration, a pressing force is applied to the protrusion 26B provided at a position corresponding to the seal portion 25B in the base 20B. For this reason, even with such a configuration, the pressing force is effectively transmitted to the seal portion 25B, and the close contact between the seal portion 25B and the power storage element 1 is sufficiently ensured, whereby the cooling fluid is hardly leaked from the ventilation path 205B. . As described above, the contact area between the protrusion 26B and the pressing portion 302 (opposing surface 302B) is smaller than the area of the opposing surface 302B, the contact area between the external spacer 2B and the pressing portion 302 is suppressed. Since the influence of the deformation | transformation etc. of the electrical storage element 1 to the seal | sticker part 25B and the press part 302 is suppressed more, it is more preferable.

  In the power storage device of the above embodiment, the base 20A of the inner spacer 2A has a substantially rectangular shape, and is approximately the same size as the first wall 100c of the power storage element 1. However, the base 20 </ b> A of the inner spacer 2 </ b> A is not limited to a substantially rectangular shape as long as the postures of the two adjacent power storage elements 1 can correspond to each other, and the first wall 100 c of the power storage element 1 It is not limited to what is a substantially equivalent magnitude | size.

  In the power storage device of the above embodiment, the base 20A of the inner spacer 2A has a rectangular wave shape, thereby forming a ventilation path between the base 20A and the power storage element 1. However, if the base 20A of the inner spacer 2A allows fluid to pass between the first surface and the electricity storage device 1 (between the second surface and the electricity storage device 1), the shape of the base 20A is a rectangular wave shape. It is not limited to a certain thing. Moreover, when it is not necessary to form a ventilation path between the base 20A of the inner spacer 2A and the power storage element 1, the base 20A of the inner spacer 2A may be formed in a flat plate shape.

  In the termination member of the above embodiment and the termination member before being incorporated into the power storage device (that is, the termination member alone), in the X-axis direction, the pressing portion 302 and the portion that contacts the base 20B in the pressure contact portion 300 are the same. Although in position, it is not limited to this configuration. For example, in the terminal member before being assembled into the power storage device, the pressing portion 302 is located closer to the power storage element 1 than the contact portion of the pressing portion 300 (the pressing portion 302 protrudes from the pressing portion 300 in the X-axis direction. Configuration). According to such a configuration, the pressing portion 302 is formed by connecting the pair of termination members 30 to each other by the first connection portion 310 and the second connection portion 311 so that the pressure contact portion 300 of each termination member 30 contacts the outer spacer 2B. A sufficient pressing force is applied to the seal portion 25B.

  DESCRIPTION OF SYMBOLS 1 ... Power storage element, 10 ... Case, 100 ... Case main body, 100a ... Closure part, 100b ... Trunk part, 100c ... First wall, 100d ... Second wall, 101 ... Cover plate, 101a ... Gas exhaust valve, 11 ... External Terminal, 2 ... Spacer, 20 ... Base, 2A ... Internal spacer, 20A ... Base, 200A ... First contact portion, 200B ... Second contact portion, 200C ... Connection portion, 21A ... Restriction portion, 22A ... Valve cover portion 2B ... External spacer, 20B ... Base, 201B ... Internal contact portion (second projecting portion), 205B ... Ventilation path, 21B ... Regulating portion, 22B ... Fitting portion, 23B ... Shaft portion, 24B ... External contact portion (first) 1 projecting part), 25B ... seal part, 26B ... projecting part, 3 ... holding member, 30 ... end member, 31 ... frame, 4 ... insulator, 40 ... first insulating part, 41 ... second insulating part, 300 ... pressure contact Part, 300a ... insert , 300b ... through hole, 301 ... main body, 302, 302C, 302D ... pressing portion, 302B ... opposing surface, 303 ... supporting portion, 310 ... first connecting portion, 311 ... second connecting portion, 313 ... fixing portion, 313a ... First fixing portion, 313b ... second fixing portion, 313c ... first hole portion, 313d ... second hole portion

Claims (7)

At least one power storage element;
An external spacer adjacent to the power storage element, the first spacer facing the power storage element and an external spacer having a second surface opposite to the first surface ;
A termination member disposed so as to sandwich the external spacer between the storage element, and
The external spacer is a base that extends along the adjacent power storage element, and forms a ventilation path through which cooling fluid can flow between the base and the power storage element, and protrudes from the base to contact the power storage element. A seal part that prevents leakage of the cooling fluid from the ventilation path by contacting,
The termination member is a pressing portion provided at a position corresponding to the sealing portion, and a pressing portion that presses the sealing portion toward the power storage element via the base, and a portion adjacent to the pressing portion. A power storage device having a recess formed in a direction from the first surface toward the second surface .   The power storage device according to claim 1, wherein the pressing portion extends along the base and includes an end edge of the termination member.   The power storage device according to claim 1, wherein the external spacer has a protrusion protruding toward the pressing portion from a position corresponding to the seal portion in the base. The pressing portion has a facing surface that faces the base and contacts the protrusion.
The power storage device according to claim 3, wherein a contact area of the protrusion with the pressing portion is smaller than an area of the facing surface.   The power storage device according to claim 1, wherein the seal portion and the pressing portion extend in a flow direction of the cooling fluid in the ventilation path.   The said termination | terminus member has a main body extended along the said base, It is a support part which supports the said press part, Comprising: The support part extended toward the said external spacer from the said main body, The any one of Claims 1-5 The power storage device according to claim 1. The power storage device according to claim 6, wherein the pressing portion extends from a tip of the support portion toward a periphery of the base.

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