JP7214965B2 - power storage device - Google Patents

Description

The present invention relates to a power storage device.

Patent Literature 1 discloses a battery pack in which a laminate type battery and a protection circuit are accommodated in an outer case. A laminate type battery includes a lead taken out from a sealing portion of a laminate film. A protection circuit is electrically connected to the lead.

JP-A-2002-117819

In the battery pack of Patent Literature 1, the leads are fixed inside the exterior case with silicone resin. However, in the battery pack of Patent Literature 1, no consideration is given to the sealing of the portion where the parts (for example, leads) inside the outer case are taken out from the outer case.

SUMMARY OF THE INVENTION An object of the present invention is to provide a power storage device capable of effectively sealing a portion of an exterior body from which an electric wire is led out to the outside and ensuring airtightness.

A first aspect of the present invention is a device comprising: a power storage element; an exterior body that houses the power storage element; and an electric wire electrically connected to an electric wire, and the exterior body includes a wiring portion in which the other end side of the electric wire is wired, a take-out portion having one end opened, and the opening of the take-out portion. A sealing portion is provided for sealing gaps between a wall portion of the wiring portion facing the opening of the extraction portion, the electric wire, and the cover. provides a power storage device.

According to this aspect, since the wall portion that is the bottom of the wiring portion, the wire, and the sealing portion that seals the gap between the cover is provided, it is possible to effectively seal the portion from which the wire is taken out from the exterior body. Therefore, it is possible to ensure airtightness between the inside and the outside of the exterior body.

The wiring portion includes a partition plate protruding from the wall portion, the partition plate has an insertion portion through which the electric wire is inserted, and the sealing portion is provided in the insertion portion. In addition, the extraction part includes a penetration part for extracting the other end of the electric wire from the power storage element side, and the partition plate partitions the wiring part on the penetration part side and the side opposite to the penetration part. is formed as According to these aspects, it is possible to improve the workability of wiring the electric wire in the wiring portion and the workability of sealing the electric wire in the wiring portion.

The partition plate is provided with a groove on the opening side, and the cover is provided with a convex piece that is inserted into the groove and restricts movement of the electric wire. Here, when the sealing portion is made of a thermoplastic resin or adhesive that takes a long time to harden, if the electric wire moves after wiring, a gap will occur between the electric wire and the sealing portion, and airtightness cannot be ensured. There is However, according to this aspect, since the movement of the electric wire can be restricted by the insertion portion and the projecting piece, it is possible to suppress the formation of a gap between the electric wire and the sealing portion. Therefore, it is possible to ensure airtightness between the inside and the outside of the exterior body.

The sealing portion is made of a thermoplastic resin having a melting point lower than that of the coating of the electric wire. The convex piece is fixed to the recessed groove by the sealing portion, and the fitting piece is fixed to the fitting groove by the sealing portion. According to this aspect, it is possible to seal the portion of the exterior body from which the electric wire is taken out and to fix the cover to the take-out portion at the same time. Further, the filling of the recessed groove and the fitting groove with the thermoplastic resin can also be performed in a series of operations. Moreover, the thermoplastic resin forming the sealing portion takes a shorter time to harden than the adhesive. Therefore, the assembling workability of the power storage device can be improved. Further, since a thermoplastic resin having a melting point lower than that of the coating of the wire is used, the heat of the molten resin does not affect the wire.

A second aspect of the present invention is a device comprising a power storage element, an exterior housing the power storage element, one end electrically connected to the power storage element within the exterior, and the other end outside the exterior. and a wire that is electrically connected to the wire, and the exterior body has a wiring portion in which the other end side of the wire is wired, and the wiring portion has a lower melting point than the coating of the wire. Provided is a power storage device comprising a sealing portion that is made of a thermoplastic resin and seals a gap between the electric wire and the wiring portion.

According to this aspect, since the gap between the electric wire and the wiring portion is sealed by the sealing portion, it is possible to ensure airtightness between the outside and the inside of the exterior body. In addition, since the thermoplastic resin forming the sealing portion takes less time to harden than the adhesive, the assembling workability of the power storage device can be improved. Further, since a thermoplastic resin having a melting point lower than that of the coating of the wire is used, the heat of the molten resin does not affect the wire.

In the power storage device of the present invention, since the portion from which the electric wire is taken out from the exterior body is sealed with the sealing portion, the airtightness between the exterior and the interior of the exterior body can be ensured. Further, by using a thermoplastic resin having a melting point lower than that of the coating of the electric wire as the sealing portion, it is possible to prevent the electric wire from being affected by the heat of the molten resin, and improve workability in assembling the power storage device.

1 is an exploded perspective view showing a power storage device according to an embodiment of the present invention; FIG. FIG. 2 is a perspective view showing part of a power storage device; FIG. 2 is a plan view showing a portion of FIG. 1; 4 is a perspective view of FIG. 3; FIG. FIG. 4 is a cross-sectional view along the line AA of FIG. 3; FIG. 4 is a cross-sectional view along the line BB of FIG. 3; FIG. 4 is a sectional view taken along the line CC of FIG. 3 with the cover removed; The top view which shows the modification of a sealing structure. Sectional part which shows the modification of an insertion part. A cross-sectional portion showing another modified example of the insertion portion. A cross-sectional portion showing another modified example of the insertion portion.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a power storage device 10 according to an embodiment of the invention. The power storage device 10 includes a plurality of (eight in this embodiment) battery cells (power storage elements) 12, a busbar unit 22 arranged on the battery cells 12, and a monitoring device 26 arranged on the busbar unit 22. , which are housed inside the exterior body 30 . The monitoring device 26 is electrically connected to an external device (not shown) by an electric wire 27, and the present embodiment effectively seals the portion of the exterior body 30 from which the electric wire 27 is taken out.

In the following description, the lateral direction of the battery cells 12, which is the direction in which the battery cells 12 are arranged, may be referred to as the X direction. Also, the longitudinal direction of the battery cell 12 may be referred to as the Y direction, and the height direction of the battery cell 12 may be referred to as the Z direction. The power storage device 10 of this embodiment is a rectangular parallelepiped whose X-direction dimension is longer than its Y-direction dimension.

(Overview of power storage device)
As shown in FIG. 1 , the battery cells 12 are arranged in the X direction and accommodated in the exterior body 30 . Insulation between adjacent battery cells 12 is performed by an insulating member arranged on the outer periphery of each battery cell 12 .

A nonaqueous electrolyte secondary battery such as a lithium ion battery is used as the battery cell 12 . However, various battery cells 12 including capacitors can be applied other than the lithium ion battery. Each battery cell 12 is provided with a metal container 13, and the container 13 accommodates an electrode body in which positive and negative electrode sheets are laminated with a separator interposed therebetween, current collectors of the positive and negative electrodes, and an electrolytic solution. It is

The container 13 is rectangular and has a pair of long sides 14 extending along the YZ plane and a pair of short sides 15 extending along the XZ plane. The dimension of the short side 15 in the X direction is shorter than the dimension of the long side 14 in the Y direction. The container 13 also has a bottom surface 16 and a terminal surface (lid) 17 extending along the XY plane. On the terminal surface 17 located on the upper side in the Z direction, a positive terminal 18 is arranged on one end side in the Y direction, and a negative terminal 19 is arranged on the other end side in the Y direction.

End plates 20 made of metal plates thinner than the battery cells 12 and having the same shape as the long side surfaces 14 are arranged at both ends of the arrayed battery cells 12 in the X direction. The end plates 20 abut against the long side surfaces 14 of the battery cells 12 and the end walls 34 of the exterior body 30 .

The busbar unit 22 includes a busbar frame 23 to which a plurality of busbars (not shown) are attached, and is arranged on the terminals 18 and 19 side (upper side in the Z direction) of the plurality of battery cells 12 . The plurality of busbars are electrically connected to the positive terminal 18 and the negative terminal 19 of a predetermined battery cell 12 , respectively, and constitute a power supply circuit that supplies power to the plurality of battery cells 12 . The busbar frame 23 functions as an inner lid that partitions the interior of the exterior body 30 . Reference numeral 24 in FIG. 1 denotes a cover that covers a plurality of busbars.

The monitoring device 26 is a BMU (battery monitoring unit) that monitors the output voltage from the battery cell 12 group. The monitoring device 26 is arranged on the busbar frame 23 and electrically connected to the positive terminal 18 of the battery cell 12 located at the end in the direction of current flow. 2 and 5A, one end of an electric wire 27 is electrically connected to the monitoring device 26, and the other end of the electric wire 27 is electrically connected to the connector 28. As shown in FIG. That is, one end of the electric wire 27 is electrically connected to the battery cell 12 via the monitoring device 26 and the busbar.

The connector 28 is fitted with an external connector electrically connected to an external device (for example, a control section of the vehicle). Thereby, the voltage detection result by the monitoring device 26 can be transmitted to the external device. Alternatively, the other end of the electric wire 27 may be directly connected to an external device without using the connector 28 . Also, the monitoring device 26 may be located on the vehicle itself rather than within the exterior body 30 . In this case, one end of the electric wire 27 is electrically connected to the busbar of the busbar unit 22, and the other end of the electric wire 27 is electrically connected to a monitoring unit (BMU) as an external device.

The exterior body 30 is made of resin, and includes a main body 32 with one open surface (an upper surface in the Z direction) and a lid 38 that closes the opening of the main body 32 . The main body 32 and the lid 38 are fixed liquid-tight and air-tight by welding or the like.

The main body 32 has a rectangular parallelepiped shape whose X-direction dimension is longer than its Y-direction dimension, and includes a rectangular bottom wall 33 . A pair of end walls 34 located outside in the arrangement direction of the battery cells 12 are erected at both ends of the bottom wall 33 in the X direction. On both sides of the bottom wall 33 in the Y direction, a pair of side walls 35 positioned outside in the direction intersecting with the arrangement direction of the battery cells 12 are erected.

The lid 38 is provided with a positive external terminal 39 on one end in the X direction and a negative external terminal 40 on the other end in the X direction. These external terminals 39 and 40 protrude upward in the Z direction from the cover 38 and are electrically connected to the busbar unit 22 respectively. The battery cell 12 group can be electrically charged and discharged via the busbar unit 22 and the external terminals 39 and 40 .

The lid body 38 is provided with a take-out portion 42 for taking out the electric wire 27 from the inside of the exterior body 30 to the outside. In the power storage device 10 , it is necessary to ensure the airtightness of the take-out portion 42 , that is, the ability to block leakage of gas and liquid between the inside and the outside of the exterior body 30 . A sealing structure for ensuring this blocking property is provided in the take-out portion 42 .

(Overview of extractor)
As shown in FIGS. 2 to 4 , the extracting portion 42 includes a penetrating portion 45 , a wiring portion 47 , a connecting portion 53 and a joint portion 60 . A cover 64 closes the opening 43 at the upper end of the take-out portion 42 including these.

The electric wire 27 connected to the monitoring device 26 is routed through the through portion 45 , the wiring portion 47 , and the connection portion 53 in this order, and is connected to the connector 28 arranged in the connection portion 53 . The portion closer to the through portion 45 than the wiring portion 47 belongs to the inside of the exterior body 30 that needs to prevent the intrusion of gas and liquid. The connecting portion 53 side of the wiring portion 47 belongs to the outside of the exterior body 30 which does not need to be prevented from intruding gas and liquid. The wiring portion 47 serving as a boundary between them is provided with a sealing portion 74a for hermetically and liquid-tightly sealing the inside (the penetrating portion 45 side) and the outside (the connecting portion 53 side) of the exterior body 30. there is

As shown most clearly in FIG. 3, the extracting portion 42 includes a through portion 45, a wiring portion 47, a connection portion 53, and a joint portion 60 in this order from one end side to the other end side in the Y direction. This is the layout provided. The wiring portion 47 and the connecting portion 53 have the same size in the Y direction and are arranged adjacent to each other in the X direction. The combined dimension of the wiring portion 47 and the connecting portion 53 in the X direction is the same as the dimension of the through portion 45 in the X direction. The cover 64 has a plate shape having the same shape as the overall shape of the take-out portion 42 , and closes the opening 43 by being fitted into the opening 43 .

In this way, by collectively arranging the through portion 45, the wiring portion 47, and the joint portion 60 that require sealing in one section, the number of covers 64 can be reduced, and the shape of the cover 64 can be reduced. . Also, a wall (partition plate 63 to be described later) that partitions the adjacent connecting portion 53 and joint portion 60 can be shared. Therefore, the configuration of the take-out portion 42 including the joint portion 60 can be simplified.

The through portion 45 is a square-shaped opening, and is provided for taking out the external device connection side (the other end side) of the electric wire 27 from the battery cell 12 side to the connection portion 53 side.

Also referring to FIG. 5B, the wiring portion 47 is provided to restrict the movement of the electric wire 27 on the external device connection side. The wiring portion 47 is provided with a partition wall (wall portion) 48 that faces the opening 43 and is a wall that separates the inside and the outside of the exterior body 30 . A partition plate 49 and partition plates 50 a and 50 b are provided in the partition wall 48 so as to protrude toward the opening 43 .

Referring also to FIG. 5A, the partition plate 49 separates the through portion 45 side of the wiring portion 47 from the connecting portion 53 side (opposite side to the through portion 45), and is an intermediate portion of the partition wall 48 in the Y direction. and extends in the X direction. That is, the partition plate 49 is a plate portion that partitions the intermediate portion of the wiring portion 47 . With the partition plate 49 as a reference, the part from the partition plate 49 to a partition plate 50a, which will be described later, located on the through portion 45 side is one side of the wiring portion 47, and the partition plate 57, which will be described later, is located on the connection portion 53 side from the partition plate 49. is the other side of the routing portion 47 .

Like the partition plate 49, the partition plate 50a partitions between the wiring portion 47 and the through portion 45, is located at the end of the partition wall 48 on the through portion 45 side in the Y direction, and extends in the X direction. The partition plate 50b is positioned on the partition plate 48 on the opposite side of the partition plate 49 in the Y direction from the partition plate 50a and extends in the X direction.

Referring also to FIG. 5B, the partition plate 49 and the partition plate 50a are formed with insertion portions 51a and 51b, which are grooves opened on the opening 43 side and through which the electric wires 27 are inserted. The electric wire 27 includes a metal core wire 27a and a resin or rubber coating 27b. The groove width of the insertion portions 51a and 51b is larger than the outer diameter of the core wire 27a and smaller than the outer diameter of the coating 27b.

5B and 5C together, a connection portion 53 is provided for arranging the connector 28. As shown in FIG. The cover 64 is provided with a rib 65 that restricts movement of the connector 28 arranged on the connection portion 53 . The connecting portion 53 includes a partition wall 54 that faces the opening 43 and is a wall that separates the inside and the outside of the exterior body 30 . The partition 54 is positioned closer to the battery cell 12 (downward in the Z direction) than the partition 48 of the wiring portion 47 . The partition wall 54 is provided with a first partition plate 55 , a second partition plate 56 and a partition plate 57 so as to protrude toward the opening 43 .

The first partition plate 55 partitions between the connection portion 53 and the through portion 45, is positioned at the end of the partition wall 54 on the through portion 45 side in the Y direction, and extends in the X direction. The surface of the first partition plate 55 on the through portion 45 side is located on the same plane as the surface of the partition plate 50a on the through portion 45 side.

The second partition plate 56 partitions between the connection portion 53 and the wiring portion 47 and separates the inside and the outside of the exterior body 30, and is positioned at the end of the partition wall 54 on the side of the wiring portion 47 in the X direction. and extends in the Y direction. A partition wall 48 is continuous with the second partition plate 56 . One end of the second partition plate 56 is continuous with the end of the partition plate 49 , and the other end of the second partition plate 56 is continuous with the end of the first partition plate 55 . That is, as shown in FIG. 3, the partition plate 49, the first partition plate 55, and the second partition plate 56 extend from the outer peripheral wall 42a located on one end side in the X direction to the other end side in the X direction in the extraction portion 42. It is continuous over the located outer peripheral wall 42b.

It should be noted that the partition plate 49 and the partition plate 50a may be exchanged so that the partition plate 49 and the first partition plate 55 are provided on the same plane. With this configuration, the second partition plate 56 is not required, so the configuration of the take-out portion 42 can be simplified. However, in this case, since the electric wire 27 may move in the extending direction (the Y direction in FIG. 3), the thermoplastic resin forming the sealing portion 74 leaks from the insertion portion 51a during assembly, and in the worst case, the thermoplastic resin There is a possibility that the resin will flow down into the through portion 45 and the sealing precision will be lowered.

On the other hand, as in the present embodiment, if the partition plate 49 and the first partition plate 55 are arranged with a gap in the Y direction and are connected by the second partition plate 56, the thermoplastic resin can be suppressed. That is, the partition plate 49 is spaced apart from the penetrating portion 45 . The movement of the wire 27 in the X direction and the Y direction is restricted by the insertion portions 51a and 51b of the partition plate 49 and the partition plate 50a. As a result, it is possible to prevent the thermoplastic resin from flowing down to the through portion 45, and it is possible to secure a region where the thermoplastic resin is applied, so that the sealing accuracy can be effectively improved.

Like the second partition plate 56, the partition plate 57 partitions between the connection portion 53 and the wiring portion 47, and also partitions the inside and the outside of the exterior body 30. It is positioned at the end on the side of the portion 47 and extends in the Y direction. A partition wall 48 is continuous with the partition plate 57 . The partition plate 57 is continuous with the second partition plate 56, and the surface of the partition plate 57 on the connection portion 53 side is located on the same plane as the surface of the second partition plate 56 on the connection portion 53 side. .

The partition plate 57 is formed with an insertion portion 58 that is a groove that is open on the opening 43 side and through which the electric wire 27 is inserted, similarly to the insertion portions 51a and 51b.

The joint portion 60 is a rectangular opening, and is provided for electrically connecting the negative external terminal 40 to the busbar unit 22 . Specifically, the busbars 61 arranged on the lid 38 and the busbars of the busbar unit 22 are connected with the nuts 62 in a state where the lid 38 is welded to the main body 32 . Thereby, the negative external terminal 40 connected to the busbar 61 and the busbar unit 22 are electrically connected. A joint portion for electrically connecting the positive electrode external terminal 39 and the busbar unit 22 is provided on the opposite side of the joint portion 60 in the X direction.

A partition plate 63 is provided between the joint portion 60 and the connection portion 53 to partition them. The partition plate 63 is located at the end of the partition wall 54 opposite to the through portion 45 in the Y direction and extends in the X direction.

(Outline of sealing structure)
Subsequently, as shown in FIGS. 2 to 4, the opening 43 of the take-out portion 42 is covered with a cover 64, and these seal portions 74 (FIGS. 3, 5A, and 5C) made of thermoplastic resin (hot melt). (cross-hatched part of )) are hermetically and liquid-tightly sealed.

A fitting groove 67 recessed downward in the Z direction is provided on the outer periphery of the take-out portion 42 , and a fitting piece (fitting frame) 68 that fits into the fitting groove 67 is formed on the outer periphery of the cover 64 . It is The fitting groove 67 and the fitting piece 68 are not provided in the portion of the connecting portion 53 where the tip side of the connector 28 protrudes outward. The fitting groove 67 and fitting piece 68 are fixed by a sealing portion 74 that fills the gap between them.

On the opening 43 side of all the partition plates 49, 55, 56, 63, recessed grooves 70a to 70d that are recessed toward the battery cell 12 side are formed. One end of the groove 70a is continuous with the fitting groove 67, and the other end of the groove 70a is continuous with one end of the groove 70c. One end of the groove 70b is continuous with the other end of the groove 70c, and the other end of the groove 70b is continuous with the fitting groove 67. As shown in FIG. Both ends of the concave groove 70d are continuous with the fitting grooves 67, respectively.

The grooves 70a to 70d and the fitting groove 67 have the same depth in the Z direction. The bottom of the recessed groove 70a and the partition walls 48 on one side and the other side of the wiring portion 47 are flush with each other in the XY directions without steps. are the same. Also, walls rising in the Z direction from the bottoms of the grooves 70a to 70d are formed on the same plane. The partition plates 49, 55, 56, 63 constructed in this manner have a double wall structure by forming the grooves 70a to 70d. Therefore, the partition plates 49, 55, 56, and 63 can be defined as a plate portion on one side and a plate portion on the other side with the concave grooves 70a to 70d interposed therebetween, if necessary.

The cover 64 is provided with projections 71a-71d that are inserted into the grooves 70a-70d. The protruding piece 71a corresponding to the recessed groove 70a in which the insertion portion 51a is formed has the function of restricting the movement of the electric wire 27. As shown in FIG. An arc-shaped notch portion 72 is formed in the projecting piece 71a at a portion corresponding to the insertion portion 51a (electric wire 27).

The sealing portion 74 is made of a thermoplastic resin having a melting point lower than that of the coating 27 b of the electric wire 27 . The gap between the fitting groove 67 and the fitting piece 68 and the gap between the concave grooves 70a to 70d and the convex pieces 71a to 71d are filled and sealed by the sealing portion 74 . In addition, in the insertion portion 51a, the gap between the wiring portion 47, that is, the gap between the partition wall 48, the electric wires 27, and the cover 64 is filled and sealed by the sealing portion 74a. Moreover, the fitting groove 67 and the fitting piece 68, and the concave grooves 70a to 70d and the convex pieces 71a to 71d are fixed by the sealing portion 74, respectively.

For example, as the electric wire 27, a core wire 27a covered with a covering 27b made of crosslinked polyethylene can be used. The heat resistance temperature of the electric wire 27 (coating 27b) is approximately 120°C. A thermoplastic resin having a melting point up to about 180° C. can be used as the thermoplastic resin forming the sealing portion 74 . This is because the temperature of the molten thermoplastic resin drops to the heat resistance temperature of the wire 27 when filling the fitting groove 67 and the recessed grooves 70a to 70d. That is, as the thermoplastic resin, any resin can be used as long as the temperature at the time of filling (applying) is lower than the heat resistance temperature of the wire 27 . Examples of such thermoplastic resins include:

Olefin-based thermoplastic resins are resistant to gasoline, and are therefore effective for power storage device 10 mounted on a vehicle. Other polyester-based, polyamide-based, and urethane-based thermoplastic resins are also resistant to alcohol, and therefore can be used for power storage device 10 mounted on a vehicle. Since the melting point of these thermoplastic resins is higher than the heat resistance temperature (e.g., 80° C.) required for power storage device 10, even if power storage device 10 unintentionally generates heat, sealing portion 74 will not melt again. .

As described above, since power storage device 10 includes sealing portion 74a for sealing gaps between partition wall 48, which is the bottom of wiring portion 47, electric wire 27, and cover 64, the portion of exterior body 30 from which electric wire 27 is taken out is can be effectively sealed. Therefore, airtightness between the inside and the outside of the exterior body 30 can be ensured. Moreover, since the sealing portion 74 a is made of a thermoplastic resin having a melting point lower than that of the coating 27 b of the wire 27 , it is possible to suppress the heat of the molten resin from affecting the wire 27 .

(Method for manufacturing power storage device)
As shown in FIG. 1, when manufacturing the power storage device 10, for example, the battery cells 12 are arranged in the X direction (arranging step). Next, as shown in FIGS. 3 and 5C, the busbar unit 22 is arranged on the terminal surface 17 side of the arrayed battery cell 12 group, and the terminals 18 and 19 and the busbar are joined by welding (joining step). Next, the battery cell 12 group in which the busbar unit 22 including the monitoring device 26 is arranged is accommodated in the main body 32 (accommodating step). Next, the cover 38 is placed in the opening of the main body 32 and welded, and then the external terminals 39 and 40 and the busbar unit 22 are electrically connected through the joints 60 (connecting step).

Next, the external device connection side of the electric wire 27 connected to the monitoring device 26 is taken out from the penetration portion 45 and connected to the connector 28 of the connection portion 53 through the wiring portion 47 (wiring step). At this time, the wires 27 are inserted through the insertion portions 51a, 51b, and 58, respectively. Next, the continuous fitting groove 67 and the recessed grooves 70a to 70d are filled with molten thermoplastic resin in a series of operations, and the cover 64 is placed on the take-out portion . Then, it waits until the thermoplastic resin hardens (sealing step).

In this manner, the wiring portion 47 is provided with insertion portions 51a, 51b, and 58 for wiring the electric wire 27. As shown in FIG. Moreover, the partition plate 49 in which the insertion portion 51a is formed is formed with a concave groove 70a filled with thermoplastic resin. Therefore, it is possible to improve the workability of wiring the electric wire 27 with respect to the wiring portion 47 and the workability of sealing. Moreover, since the fitting groove 67 of the take-out portion 42 is also filled with the thermoplastic resin, the sealing of the portion of the exterior body 30 from which the electric wire 27 is taken out and the fixing of the cover 64 to the take-out portion 42 can be performed at the same time. can.

The thermoplastic resin that forms the sealing portion 74 takes a shorter time to harden than the adhesive, so that the assembling workability of the power storage device 10 can be improved. However, if the wire 27 that has been hardened to some extent (before hardening) moves, a gap will be created between the wire 27 and the sealing portion 74a, and airtightness may not be ensured. However, in the present embodiment, the partition plate 49 is formed with the insertion portion 51a, and the cover 64 is provided with the convex piece 71a capable of restricting the movement of the electric wire. As a result, the movement of the electric wire 27 can be restricted, so that the occurrence of a gap between the electric wire 27 and the sealing portion 74a can be suppressed. Therefore, airtightness between the inside and the outside of the exterior body 30 can be ensured.

As described above, in the power storage device 10 of the present embodiment, the sealing portion 74a seals the portion where the electric wire 27 is taken out from the exterior body 30, so that airtightness between the exterior and the interior of the exterior body 30 can be ensured. In addition, since a thermoplastic resin having a melting point lower than that of the coating of the electric wire 27 is used as the sealing portion 74a, it is possible to improve the assembling workability of the electric storage device 10 while preventing the electric wire 27 from being affected by the heat of the molten resin. .

Note that the power storage device of the present invention is not limited to the configuration of the above embodiment, and various modifications are possible.

For example, as shown in FIG. 6, the insertion portion 51a of the electric wire 27 may be provided independently without communicating with the groove 70a for sealing. In this case, as shown in FIG. 7A, it is preferable to provide the cover 64 with a projection piece 75 for restricting the movement of the electric wire 27. However, as shown in FIG. may be

Further, as shown in FIGS. 7A and 7C, the shapes of the first insertion portion 51a through which the electric wire 27 is inserted and the convex piece 75 (71a) that regulates the movement of the electric wire 27 can be changed as necessary. .

Further, the entire wiring portion 47 may be sealed by the sealing portion 74a without providing the partition plate 49. FIG. Also, the sealing portions 74 and 74a may be made of an adhesive instead of the thermoplastic resin.

The battery cell 12 that constitutes the storage element may be of a winding type in which a belt-shaped electrode sheet and a separator are wound, or may be of a lamination type in which a plurality of rectangular electrode sheets and separators are laminated. good. Moreover, the battery cell 12 is not limited to a prismatic battery in which an electrode body is housed in a container 13, and may be a laminate type battery in which a laminated electrode body is sealed with a laminate film.

The power storage device 10 of the present invention can be used for starting a gasoline vehicle or a diesel vehicle equipped with only an internal combustion engine, and a hybrid vehicle equipped with an internal combustion engine and an electric motor. Moreover, the power storage device 10 of the present invention can also be used for driving a hybrid vehicle and an electric vehicle equipped with only an electric motor.

10 power storage device 12 battery cell (power storage element)
DESCRIPTION OF SYMBOLS 13... Container 14... Long side 15... Short side 16... Bottom 17... Terminal surface 18... Positive terminal 19... Negative terminal 20... End plate 22... Bus bar unit 23... Bus bar frame 24... Cover 26... Monitoring device 27... Electric wire 27a... Core wire 27b Coating 28 Connector 30 Exterior body 32 Main body 33 Bottom wall 34 End wall 35 Side wall 38 Lid 39 Positive electrode external terminal 40 Negative electrode external terminal 42 Extraction part 42a, 42b Peripheral wall 43 ... Opening 45 ... Penetrating portion 47 ... Cabling portion 48 ... Partition 49 ... Partition plate 50a, 50b ... Division plate 51a, 51b ... Insertion portion 53 ... Connection portion 54 ... Partition wall 55 ... First partition plate 56 ... Second partition plate 57 Partition plate 58 Insertion portion 60 Joint portion 61 Bus bar 62 Nut 63 Partition plate 64 Cover 65 Rib 67 Fitting groove 68 Fitting piece 70a to 70d Groove 71a to 71d Convex piece 72 ... Notch portion 74 ... Sealing portion 74a ... Sealing portion of insertion portion 75 ... Convex piece

Claims (6)

a storage element;
an exterior body that houses the power storage element;
a wire one end of which is electrically connected to the power storage element inside the exterior body and the other end of which is electrically connected to a device outside the exterior body,
The exterior body is
a lead-out portion having one open end, including a wiring portion in which the other end side of the electric wire is wired;
a cover that closes the opening of the extraction part so as to cover the wiring part,
The power storage device, wherein the wiring portion is provided with a sealing portion that seals a gap between a wall portion of the wiring portion facing the opening of the extraction portion, the electric wire, and the cover. The wiring portion includes a partition plate protruding from the wall portion,
The partition plate is formed with an insertion portion through which the electric wire is inserted,
The power storage device according to claim 1 , wherein said sealing portion is provided in said insertion portion. the extraction portion includes a penetration portion for extracting the other end side of the electric wire from the power storage element side;
3. The power storage device according to claim 2, wherein said partition plate is formed so as to partition said wiring portion between said through portion side and a side opposite to said through portion. The partition plate has a groove on the opening side,
4. The power storage device according to claim 2, wherein said cover includes a projecting piece inserted into said groove to restrict movement of said electric wire. The sealing portion is made of a thermoplastic resin having a lower melting point than the coating of the electric wire,
A fitting groove is provided on the outer periphery of the take-out portion,
A fitting piece fitted in the fitting groove is formed on the outer periphery of the cover,
5. The power storage device according to claim 4, wherein said convex piece is fixed to said concave groove by said sealing portion, and said fitting piece is fixed to said fitting groove by said sealing portion. a storage element;
an exterior body that houses the power storage element;
a wire one end of which is electrically connected to the power storage element inside the exterior body and the other end of which is electrically connected to a device outside the exterior body,
The exterior body is
a lead-out portion having one open end, including a wiring portion in which the other end side of the electric wire is wired;
and a cover that closes the opening of the take-out part,
The wiring portion is provided with a sealing portion that seals a gap between a wall portion of the wiring portion facing the opening of the extraction portion, the electric wire, and the cover,
The wiring portion includes a partition plate protruding from the wall portion,
The partition plate is formed with an insertion portion through which the electric wire is inserted,
The power storage device, wherein the sealing portion is provided in the insertion portion.

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