JP6759534B2 - Power storage device - Google Patents

Description

The present invention relates to a power storage device including one or more power storage elements and an exterior body arranged outside the one or more power storage elements, and a method for manufacturing the power storage device.

As a power storage device including one or more power storage elements, conventionally, a power storage device having a configuration in which the one or more power storage elements are housed in an exterior body is known (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2011-134552

Here, as a configuration in which the power storage element is housed in the exterior body, the power storage element is inserted into the exterior body body having an opening, and the opening of the exterior body body is closed with a lid to provide the power storage element in the exterior body. A configuration to accommodate is conceivable. Then, when closing the opening of the exterior body body with the lid body, it is conceivable that the exterior body body and the lid body are joined by welding.

However, when the exterior body and the lid are joined by welding, the heat in the welding affects the heat-sensitive material (weak heat body) such as the circuit board arranged in the power storage device, and the heat is weak. There is a problem that the function of the hot body may be deteriorated.

The present invention has been made to solve the above problems, and to provide a power storage device capable of reducing the influence of heat on the welding even when welding is used for joining the exterior bodies. With the goal.

In order to achieve the above object, the power storage device according to one aspect of the present invention includes one or more power storage elements and a first exterior body and a second exterior body arranged outside the one or more power storage elements. A power storage device including a welded portion which is a joint portion between the first exterior body and the second exterior body, which is formed by joining the first exterior body and the second exterior body by welding. A weak heat element and a heat shield portion arranged between the welded portion and the weak heat element are provided.

According to this, the power storage device is provided with a heat shield portion between a welded portion which is a joint portion between the first exterior body and the second exterior body by welding and a weak heat element whose function is deteriorated by heat. .. Therefore, even when welding is used for joining the exterior body, the heat in the welding can be blocked by the heat shield, so that the influence of the heat on the weak heat body can be reduced.

Further, the first exterior body may have a first projecting portion projecting toward the second exterior body as the heat shield portion.

According to this, in the power storage device, the heat shield portion can be easily formed by providing the first exterior body with the first protrusion portion protruding toward the second exterior body as the heat shield portion. ..

Further, the first exterior body or the second exterior body may have a second protruding portion arranged so as to sandwich the welded portion with the first protruding portion.

According to this, since the first exterior body or the second exterior body has the second protrusion, the positions of the first exterior body and the second exterior body at the first protrusion and the second protrusion. The alignment can be easily performed. Further, the second protruding portion can hide the welded portion so as not to be exposed to the outside of the power storage device, and can improve the appearance.

Further, the second protruding portion may be provided on the first exterior body, and the first protruding portion may be higher in height than the second protruding portion.

According to this, the height of the first protruding portion of the first protruding portion and the second protruding portion that sandwich the welded portion is higher. That is, since the first protrusion only needs to function as a heat shield and the second protrusion does not need to be formed high, the height of the first protrusion is higher than that of the second protrusion. To form. As a result, the influence of heat in welding on the weak heat body can be reduced.

Further, the first protruding portion may be an annular protruding portion formed at an end portion of the first exterior body on the side of the second exterior body.

According to this, the first protruding portion is formed in an annular shape at the end of the first exterior body, and it is possible to suppress heat transfer to the inside of the first protruding portion formed in the annular shape. , The influence of heat in welding on weak heat bodies can be reduced.

Further, the heat shield may be arranged so as to be separated from the weak heat body.

According to this, since the heat shield is arranged so as to be separated from the weak heat body, the heat in the welding is suppressed from being transferred to the weak heat body through the heat shield part, and the heat is transferred to the weak heat body. The effect can be reduced.

Further, the heat shield may have a heat insulating portion formed of a heat insulating material.

According to this, since the heat shield portion has a heat insulating portion formed of a heat insulating material, the heat insulating portion further suppresses the transfer of heat in welding to the weak heat body, and the heat is weak heat. The effect on the body can be reduced.

Further, the heat insulating portion may be a cover that covers the weak heat body.

According to this, since the cover covering the weak heat body is formed of a heat insulating material, the cover further suppresses the transfer of heat in welding to the weak heat body, and affects the effect of the heat on the weak heat body. It can be reduced.

Further, the weak heat body may include a circuit board electrically connected to the power storage element.

According to this, since the weak heat body includes the circuit board, the influence of heat in welding on the circuit board can be reduced.

Further, the circuit board may be arranged between the power storage element and the welded portion at a position closer to the welded portion than the power storage element.

According to this, the circuit board is arranged at a position closer to the welded portion than the power storage element (near the welded portion), but since the heat shield portion is arranged between the circuit board and the welded portion, The influence of heat in welding on the circuit board can be reduced.

Further, the weak heat body may include a non-aqueous electrolyte secondary battery which is the power storage element.

According to this, since the weakly heated body includes a non-aqueous electrolyte secondary battery, it is possible to reduce the influence of heat in welding on the heat-sensitive non-aqueous electrolyte secondary battery.

Further, the weak heat body may include the power storage element having a lid portion arranged in the vicinity of the welded portion.

According to this, the weak heat element includes a power storage element having a lid portion arranged in the vicinity of the welded portion. That is, a resin packing is usually arranged on the lid of the container of the power storage element, but since the packing is sensitive to heat, the influence of heat in welding on the packing can be reduced.

Further, the weak heat body may include a frame body made of resin.

According to this, since the weak heat body includes a frame body made of resin, it is possible to reduce the influence of heat in welding on the heat-sensitive frame body.

Further, the power storage device according to one aspect of the present invention is a power storage device including one or more power storage elements and a first exterior body and a second exterior body arranged outside the one or more power storage elements. , The welded portion which is a joint portion between the first exterior body and the second exterior body formed by joining the first exterior body and the second exterior body by welding, and the first exterior body. The welded portion is arranged so as to sandwich the welded portion between the first protruding portion provided in the second exterior body and projecting toward the second exterior body and the first exterior body or the second exterior body. It may be provided with a second protrusion to be formed.

According to this, the power storage device includes a first protruding portion and a second protruding portion so as to sandwich the welded portion which is a joint portion between the first exterior body and the second exterior body. As a result, the heat in the welding can be blocked by the inner protruding portion of the first protruding portion and the second protruding portion, so that the influence of the heat on the internal device of the power storage device can be reduced. Further, the outer protruding portion of the first protruding portion and the second protruding portion can hide the welded portion from being exposed to the outside of the power storage device, so that the appearance can be improved. Further, it is also possible to easily align the first exterior body and the second exterior body with the first protrusion and the second protrusion.

Further, the first exterior body has the first protruding portion on the inside with the welded portion interposed therebetween, and the second protruding portion on the outside with the welded portion interposed therebetween. The height may be higher than that of the second protrusion.

According to this, the height of the inner first protruding portion of the first protruding portion and the second protruding portion that sandwich the welded portion is higher. That is, since the first protrusion only needs to function to block heat in welding and the second protrusion does not need to be formed high, the height of the first protrusion is higher than that of the second protrusion. To form. As a result, it is possible to reduce the influence of heat in welding on the equipment inside the power storage device.

Further, the method for manufacturing a power storage device according to one aspect of the present invention is a power storage device including one or more power storage elements and a first exterior body and a second exterior body arranged outside the one or more power storage elements. The power storage device includes a weak heat body and a heat shield, and the power storage device is manufactured by a joint portion between the first exterior body and the second exterior body. A heating step of heating a joint portion arranged so as to sandwich the heat shield portion with the weak heat body, and a joining step of joining the first exterior body and the second exterior body by welding at the joint portion. including.

According to this, in the manufacturing method of the power storage device, the joint portion between the first exterior body and the second exterior body arranged so as to sandwich the heat shield portion with the weak heat body is heated, and the first exterior body and the second exterior body are heated. (Ii) The exterior body is joined by welding at the joint portion. For this reason, even when welding is used for joining the exterior body, the heat shield can suppress the transfer of heat in the welding to the weak heat body, so that the effect of the heat on the weak heat body can be affected. It can be reduced.

According to the power storage device of the present invention, even when welding is used for joining the exterior bodies, the influence of heat on the welding can be reduced.

It is a perspective view which shows the appearance of the power storage device which concerns on embodiment of this invention. It is an exploded perspective view which shows each component when the power storage device which concerns on embodiment of this invention is disassembled. It is a perspective view which shows the structure of the 1st exterior body which concerns on embodiment of this invention. It is a perspective view which shows the structure of the 2nd exterior body which concerns on embodiment of this invention. It is a perspective view which shows the structure of the power storage unit which concerns on embodiment of this invention. It is a perspective view which shows the structure of the power storage element which concerns on embodiment of this invention. It is a perspective view which shows the structure of the electric apparatus which concerns on embodiment of this invention. It is a flowchart which shows the manufacturing method of the power storage device which concerns on embodiment of this invention. It is a perspective view which shows the structure when the power storage unit and the electric device are arranged on the 1st exterior body which concerns on embodiment of this invention. It is sectional drawing which shows the structure which arranges the hot plate on the exterior body which concerns on embodiment of this invention, and performs heat welding. It is sectional drawing which shows the positional relationship between the 1st exterior body and the 2nd exterior body, a power storage unit, and an electric device which concerns on embodiment of this invention. It is sectional drawing which shows the structure of the 1st exterior body and the 2nd exterior body which concerns on modification 1 of embodiment of this invention. It is sectional drawing which shows the structure of the 1st exterior body and the 2nd exterior body which concerns on the modification 2 of the Embodiment of this invention. It is sectional drawing which shows the structure of the 1st exterior body and the 2nd exterior body which concerns on modification 3 of the Embodiment of this invention.

Hereinafter, the power storage device according to the embodiment of the present invention will be described with reference to the drawings. In addition, all of the embodiments described below show a preferable specific example of the present invention. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components, manufacturing processes, order of manufacturing processes, etc. shown in the following embodiments are examples, and are not intended to limit the present invention. Further, among the components in the following embodiments, the components not described in the independent claims indicating the highest level concept are described as arbitrary components. Moreover, in each figure, the dimensions and the like are not exactly illustrated.

(Embodiment)
First, the configuration of the power storage device 1 will be described.

FIG. 1 is a perspective view showing the appearance of the power storage device 1 according to the embodiment of the present invention. Further, FIG. 2 is an exploded perspective view showing each component when the power storage device 1 according to the embodiment of the present invention is disassembled.

In these figures, the Z-axis direction is shown as the vertical direction, and the Z-axis direction will be described below as the vertical direction. However, depending on the usage mode, the Z-axis direction may not be the vertical direction. The axial direction is not limited to the vertical direction. Further, when the Z-axis direction is the vertical direction, in the normal usage mode, the negative side in the Z-axis direction is often the vertical upward direction, but for convenience of explanation, the positive side in the Z-axis direction is the vertical upward direction. It is illustrated as. The same applies to the following figures (FIGS. 3, 7 to 13).

The power storage device 1 is a device capable of charging electricity from the outside and discharging electricity to the outside. For example, the power storage device 1 is a battery module used for power storage and power supply.

As shown in these figures, the power storage device 1 includes an exterior body 10 composed of a first exterior body 100 and a second exterior body 200, and a power storage unit 30 and an electric device 40 housed inside the exterior body 10. ing.

The exterior body 10 is a rectangular (box-shaped) container (module case) that constitutes the exterior body of the power storage device 1 and is arranged outside the power storage unit 30 and the electric device 40. That is, the exterior body 10 arranges the power storage unit 30 and the electric device 40 at predetermined positions, and protects the power storage unit 30 and the electric device 40 from impacts and the like. Further, the exterior body 10 is made of an insulating resin or the like, and prevents the power storage unit 30 and the electric device 40 from coming into contact with an external metal member or the like.

Here, the exterior body 10 has a first exterior body 100 that constitutes the lid of the exterior body 10 and a second exterior body 200 that constitutes the main body of the exterior body 10. The first exterior body 100 is a flat rectangular cover member that closes the opening of the second exterior body 200, and is provided with a positive electrode external terminal 21 and a negative electrode external terminal 22. The power storage device 1 charges electricity from the outside and discharges electricity to the outside via the positive electrode external terminal 21 and the negative electrode external terminal 22. The second exterior body 200 is a bottomed rectangular tubular housing having an opening, and houses the power storage unit 30 and the electric device 40. The detailed configuration of the first exterior body 100 and the second exterior body 200 will be described later.

The power storage unit 30 has one or more power storage elements, and is connected to the positive electrode external terminal 21 and the negative electrode external terminal 22 provided on the first exterior body 100. In the present embodiment, as shown in FIG. 2, the power storage unit 30 is stacked in the Z-axis direction in a state where a plurality of power storage elements are laid horizontally, and is arranged on the first exterior body 100. Then, the power storage unit 30 is covered with the second exterior body 200 from above and is arranged inside the second exterior body 200. A detailed description of the configuration of the power storage unit 30 will be described later.

The electric device 40 is a rectangular device in which a circuit board or the like is arranged inward, and is arranged on the side (minus side in the X-axis direction) of the power storage unit 30. In the present embodiment, as shown in FIG. 2, the electric device 40 is erected in the Z-axis direction with the circuit board placed vertically and arranged on the first exterior body 100. Then, the electric device 40 is covered with the second exterior body 200 from above and is arranged inside the second exterior body 200. A detailed description of the configuration of the electrical device 40 will be described later.

Next, the configurations of the first exterior body 100 and the second exterior body 200 included in the exterior body 10 will be described in detail. First, the configuration of the first exterior body 100 will be described in detail.

FIG. 3 is a perspective view showing the configuration of the first exterior body 100 according to the embodiment of the present invention.

The first exterior body 100 is a flat rectangular member arranged outside the power storage unit 30 having one or more power storage elements, and is formed of, for example, an insulating resin such as polycarbonate or polypropylene (PP). There is. As shown in the figure, the first exterior body 100 has a first plane portion 110, a first side surface portion 120, and a first connection portion 130.

The first flat surface portion 110 is a bottom surface portion of the first exterior body 100 (when the negative side in the Z-axis direction is upward in the vertical direction, the upper surface portion of the first exterior body 100), and is a rectangular and flat plate-shaped portion. ..

The first side surface portion 120 is a square tubular portion composed of four rectangular and flat side surface portions covering all four sides of the first plane portion 110, and is on the plus side in the Z-axis direction from the outer peripheral edge of the first plane portion 110. It is formed so as to stand up (hang down on the minus side in the Z-axis direction).

The first connecting portion 130 is a portion connected to the second exterior body 200 arranged on the positive side in the Z-axis direction of the first side surface portion 120. Specifically, the first connecting portion 130 is a portion formed in an annular shape above the first side surface portion 120, and is joined to the second exterior body 200 by welding (heat welding in the present embodiment). The case where the first exterior body 100 and the second exterior body 200 are joined by heat welding is, for example, a case where the first exterior body 100 and the second exterior body 200 are formed of PP. That is, since PP has electrolytic solution resistance and is inexpensive, it is preferable as a member for forming the first exterior body 100 and the second exterior body 200, but PP is a member that is difficult to adhere and has relatively weak strength. Therefore, in order to ensure airtightness, it is necessary to heat-weld the first exterior body 100 and the second exterior body 200.

Here, the first connecting portion 130 has a first protruding portion 131, a second protruding portion 132, and a first joint portion 133.

The first joint portion 133 is an annular portion that is joined to the second exterior body 200 when the first exterior body 100 and the second exterior body 200 are joined by heat welding to form the welding portion 11 described later. Is. That is, the first joint portion 133 is a portion of the heat-welded portion of the first exterior body 100 and the second exterior body 200 on the side of the first exterior body 100 before heat welding.

Specifically, the first joint portion 133 is an annular portion including the first joint portion 133a, the first joint portion 133b, the first joint portion 133c, and the first joint portion 133d. The first joint portion 133a is a long and flat plate-like portion extending in the Y-axis direction arranged on the minus side in the X-axis direction of the first joint portion 133. Further, the first joint portion 133b is a long and flat plate-like portion extending in the X-axis direction arranged on the positive side in the Y-axis direction of the first joint portion 133. Further, the first joint portion 133c is a long and flat plate-shaped portion extending in the Y-axis direction arranged on the plus side in the X-axis direction of the first joint portion 133. Further, the first joint portion 133d is a long and flat plate-like portion extending in the X-axis direction arranged on the minus side in the Y-axis direction of the first joint portion 133.

The first protruding portion 131 is a protruding portion that protrudes toward the second exterior body 200, and specifically, an annular protruding portion formed at an end portion of the first exterior body 100 on the second exterior body 200 side. (Rib). More specifically, the first protruding portion 131 is a protruding portion (rib) rising from the surface having the first joint portion 133. That is, the first protruding portion 131 is arranged so as to sandwich the first joint portion 133 (or the welded portion 11 described later) with the second protruding portion 132, and is on the plus side in the Z-axis direction from the inside of the first joint portion 133. It is an annular part that protrudes so as to stand up toward.

Specifically, the first protruding portion 131 is the first protruding portion 131a, which is arranged corresponding to the first joint portion 133a, the first joint portion 133b, the first joint portion 133c, and the first joint portion 133d. It is an annular portion including one protruding portion 131b, a first protruding portion 131c, and a first protruding portion 131d.

The first protruding portion 131a is a long and flat plate-shaped portion extending in the Y-axis direction that protrudes from the positive side in the X-axis direction to the positive side in the Z-axis direction of the first joint portion 133a. Further, the first protruding portion 131b is a long and flat plate-shaped portion extending in the X-axis direction protruding from the negative side in the Y-axis direction to the positive side in the Z-axis direction of the first joint portion 133b. The first protruding portion 131c is a long and flat portion extending in the Y-axis direction that protrudes from the negative side in the X-axis direction to the positive side in the Z-axis direction of the first joint portion 133c. Further, the first protruding portion 131d is a long and flat plate-shaped portion extending in the X-axis direction that protrudes from the positive side in the Y-axis direction to the positive side in the Z-axis direction of the first joint portion 133d.

Here, the first protruding portion 131 is a heat shield for shielding heat generated when the first exterior body 100 and the second exterior body 200 are joined by heat welding to form the welding portion 11 described later. Functions as a department. That is, the first protruding portion 131 is a heat shield portion that is arranged between the welded portion 11 and the weak heat body to block heat to the weak heat body.

The weakly heated body means a body whose function is deteriorated by heat, for example, an electric device 40 (or a circuit board in the electric device 40), a power storage unit 30 (or a power storage element in the power storage unit 30), or the like. Includes spacers, etc.). Here, "the function is deteriorated by heat" includes that the operation is disturbed by heat (malfunction), deformed by heat, damaged by heat, the strength is lowered by heat below a predetermined strength, and the like. It is a concept. That is, the weak heat body is a concept including a member made of a material having a melting point (or glass transition temperature) lower than a predetermined temperature.

For example, when the weak heat element is an electric device 40 (or a circuit board in the electric device 40), the first protruding portion 131a arranged between the welding portion 11 and the electric device 40 is a heat shield portion. Is. Further, when the weak heat body is the power storage unit 30 (or the power storage element or spacer in the power storage unit 30), the first protruding portions 131b to 131d arranged between the welding portion 11 and the power storage unit 30. Is the heat shield.

The second protruding portion 132 is arranged so as to sandwich the first joint portion 133 (or the welded portion 11 described later) with the first protruding portion 131, and faces the positive side in the Z-axis direction from the outside of the first joint portion 133. It is an annular part that protrudes so as to stand up. That is, the second protruding portion 132 is a protruding portion that protrudes toward the second exterior body 200, similarly to the first protruding portion 131, and specifically, the second exterior body 200 side of the first exterior body 100. It is an annular protrusion (rib) formed at the end of the. As described above, the first exterior body 100 has the first protruding portion 131 inside with the first joint portion 133 (welded portion 11) interposed therebetween, and outside with the first joint portion 133 (welded portion 11) interposed therebetween. It has a second protrusion 132.

Specifically, the second protruding portion 132 is arranged so as to correspond to the first joint portion 133a, the first joint portion 133b, the first joint portion 133c, and the first joint portion 133d. It is an annular portion including a second protruding portion 132b, a second protruding portion 132c, and a second protruding portion 132d.

The second protruding portion 132a is a long and flat plate-shaped portion extending in the Y-axis direction that protrudes from the negative side in the X-axis direction to the positive side in the Z-axis direction of the first joint portion 133a. The second protruding portion 132b is a long and flat plate-shaped portion extending in the X-axis direction that protrudes from the positive side in the Y-axis direction to the positive side in the Z-axis direction of the first joint portion 133b. The second protruding portion 132c is a long and flat plate-shaped portion extending in the Y-axis direction that protrudes from the positive side in the X-axis direction to the positive side in the Z-axis direction of the first joint portion 133c. The second protruding portion 132d is a long and flat portion extending in the X-axis direction, which protrudes from the negative side in the Y-axis direction to the positive side in the Z-axis direction of the first joint portion 133d.

Here, the first protruding portion 131 is higher in height than the second protruding portion 132. That is, in the first connecting portion 130 connected to the second exterior body 200 of the first exterior body 100, the inner ribs are formed to be higher in height than the outer ribs.

Specifically, the first protruding portion 131a is formed so that the height protruding in the Z-axis direction is higher than that of the second protruding portion 132a. Further, the first protruding portion 131b is formed so that the height protruding in the Z-axis direction is higher than that of the second protruding portion 132b. Further, the first protruding portion 131c is formed so that the height protruding in the Z-axis direction is higher than that of the second protruding portion 132c. Further, the first protruding portion 131d is formed so that the height protruding in the Z-axis direction is higher than that of the second protruding portion 132d.

The first protruding portion 131 is not limited to being formed in an annular shape. For example, the first protruding portion 131 may have a configuration consisting of only the first protruding portion 131a, or may have a configuration consisting of only a part of the first protruding portion 131a. Similarly, the second protruding portion 132 is not limited to being formed in an annular shape, and is, for example, composed of only the second protruding portion 132a or only a part of the second protruding portion 132a. May be good.

Further, the first protruding portion 131 is not limited to being formed so that all the portions are higher than the second protruding portion 132, and a part of the first protruding portion 131 is secondly projected. It may be formed so as to be lower than the portion 132. For example, only the first protruding portion 131a of the first protruding portion 131 may be formed so as to have a height higher than that of the second protruding portion 132a, or only a part of the first protruding portion 131a may be formed. (Ii) It may be formed so as to be higher than the protrusion 132a.

Next, the configuration of the second exterior body 200 will be described in detail.

FIG. 4 is a perspective view showing the configuration of the second exterior body 200 according to the embodiment of the present invention.

The second exterior body 200 is a bottomed rectangular tubular member arranged outside the power storage unit 30 having one or more power storage elements, and like the first exterior body 100, for example, polycarbonate or polypropylene (PP). It is made of an insulating resin such as. Since the first exterior body 100 and the second exterior body 200 are joined by heat welding, the first exterior body 100 and the second exterior body 200 are made of the same type of material that can be heat-welded or have similar melting points. It is preferably formed of a different type of material.

As shown in the figure, the second exterior body 200 has a second flat surface portion 210, a second side surface portion 220, and a second connecting portion 230.

The second flat surface portion 210 is an upper surface portion of the second exterior body 200 (a bottom surface portion of the second exterior body 200 when the negative side in the Z-axis direction is upward in the vertical direction), and is a rectangular and flat plate-shaped portion. ..

The second side surface portion 220 is a substantially square tubular portion composed of four rectangular and flat side surface portions covering all sides of the second flat surface portion 210, and is positive in the Z-axis direction from the outer peripheral edge of the second flat surface portion 210. It is formed so as to hang down to the side (rise to the minus side in the Z-axis direction).

The second connecting portion 230 is a portion connected to the first exterior body 100, which is arranged on the negative side in the Z-axis direction of the second side surface portion 220. Specifically, the second connecting portion 230 is a portion formed in an annular shape at the end of the second side surface portion 220 on the negative side in the Z-axis direction, and is heat-welded to the first connecting portion 130 of the first exterior body 100. Joined by. Here, the second connecting portion 230 has a second joining portion 231 that is joined to the first joining portion 133 of the first connecting portion 130 by heat welding.

The second joint portion 231 and the first joint portion 133 of the first exterior body 100 are formed when the first exterior body 100 and the second exterior body 200 are joined by heat welding to form the welded portion 11 described later. It is an annular part to be joined. That is, the second joint portion 231 is a portion of the heat-welded portion of the first exterior body 100 and the second exterior body 200 on the side of the second exterior body 200 before heat welding.

Specifically, the second joint portion 231 is an annular portion including the second joint portion 231a, the second joint portion 231b, the second joint portion 231c, and the second joint portion 231d. The second joint portion 231a is a long and flat plate-shaped portion extending in the Y-axis direction arranged on the minus side in the X-axis direction of the second joint portion 231. Further, the second joint portion 231b is a long and flat plate-shaped portion extending in the X-axis direction arranged on the positive side in the Y-axis direction of the second joint portion 231. Further, the second joint portion 231c is a long and flat plate-shaped portion extending in the Y-axis direction arranged on the plus side in the X-axis direction of the second joint portion 231. Further, the second joint portion 231d is a long and flat plate-shaped portion extending in the X-axis direction arranged on the negative side in the Y-axis direction of the second joint portion 231.

Then, by heat welding, the second joint portion 231a is joined to the first joint portion 133a, the second joint portion 231b is joined to the first joint portion 133b, and the second joint portion 231c is joined to the first joint portion 133c. , The second joint portion 231d is joined to the first joint portion 133d to form the welded portion 11 described later.

Next, the configuration of the power storage unit 30 will be described in detail.

FIG. 5 is a perspective view showing the configuration of the power storage unit 30 according to the embodiment of the present invention. Specifically, the figure is an exploded perspective view showing each component of the power storage unit 30 when the power storage unit 30 is disassembled.

In the figure, for convenience of explanation, the Y-axis direction is shown as the vertical direction, and the Y-axis direction is described as the vertical direction. However, in the actual usage mode, the Y-axis direction is up and down. It is not always the direction. The same applies to FIG.

As shown in the figure, the power storage unit 30 includes a plurality of power storage elements 310 (eight power storage elements 310 in the present embodiment), a plurality of spacers 320 (seven spacers 320 in the present embodiment), and the like. It includes two sandwiching members 31 and four restraint members 32.

The power storage element 310 is a secondary battery (cell cell) capable of charging electricity and discharging electricity. More specifically, the power storage element 310 is a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery, and is included in a weak heat body whose function is deteriorated by heat. The power storage element 310 is not limited to the non-aqueous electrolyte secondary battery, and may be a secondary battery other than the non-aqueous electrolyte secondary battery, or may be a capacitor. Further, the power storage element 310 included in the power storage unit 30 does not have to be a plurality, and the power storage unit 30 may have only one power storage element 310.

The spacer 320 is an insulating plate-like member that is arranged between two adjacent power storage elements 310 and is made of a resin or the like that insulates the two power storage elements 310. Specifically, the spacer 320 is a resin frame made of an insulating resin such as polycarbonate or polypropylene (PP), and is included in a weak heat body whose function is deteriorated by heat. In the present embodiment, seven spacers 320 are arranged between the eight power storage elements 310.

The sandwiching member 31 is composed of a pair of flat plate-shaped members, sandwiching members 31a and 31b, and has a plurality of storage elements 310 (and a plurality of spacers 320) on both sides of the plurality of storage elements 310 in the arrangement direction (Z-axis direction). Hold it by sandwiching it from. Here, the sandwiching member 31 is a metal member such as stainless steel or aluminum, but is insulated from the power storage element 310 by arranging a resin frame between the sandwiching member 31 and the adjacent power storage elements 310. The sex is secured. The resin frame body arranged between the holding member 31 and the power storage element 310 is also included in the weak heat body whose function is deteriorated by heat.

Both ends of the restraint member 32 are attached to a pair of sandwiching members 31a and 31b to restrain a plurality of power storage elements 310 (and a plurality of spacers 320). That is, the restraint member 32 is arranged so as to straddle the plurality of power storage elements 310, and applies a restraining force to the plurality of power storage elements 310 in the arrangement direction (Z-axis direction) of the plurality of power storage elements 310. ..

Here, the restraint member 32 is composed of restraint members 32a to 32d. Then, the restraint members 32a and 32b are arranged on both sides (both sides in the X-axis direction) of the plurality of power storage elements 310, and the plurality of power storage elements 310 are sandwiched and restrained from both sides. Further, the restraint members 32c and 32d are arranged below the plurality of power storage elements 310 (plus side in the Y-axis direction), and restrain the plurality of power storage elements 310 from below.

The power storage unit 30 is also provided with a bus bar or the like that electrically connects the power storage elements 310 to each other, but detailed description thereof will be omitted.

Next, the configuration of the power storage element 310 will be described in detail.

FIG. 6 is a perspective view showing the configuration of the power storage element 310 according to the embodiment of the present invention. Specifically, the figure is a perspective view showing the inside of the power storage element 310 by seeing through the container 311 of the power storage element 310.

As shown in the figure, the power storage element 310 includes a container 311 and a positive electrode terminal 312 and a negative electrode terminal 313. Further, an electrode body 314, a positive electrode current collector 315, and a negative electrode current collector 316 are arranged inside the container 311. Although a liquid such as an electrolytic solution is sealed inside the container 311, the illustration of the liquid is omitted.

The container 311 is composed of a main body having a rectangular tubular shape made of metal and having a bottom, and a metal lid portion (a surface portion on the minus side in the Y-axis direction) that closes the opening of the main body. The inside of the container 311 can be sealed by accommodating the electrode body 314 or the like inside and then welding the lid portion and the main body or the like. Further, a safety valve 317 for releasing the pressure inside the container 311 when the pressure inside the container 311 rises is arranged on the lid portion of the container 311.

Further, a resin packing is arranged at the attachment points of the positive electrode terminal 312 and the negative electrode terminal 313 and the positive electrode current collector 315 and the negative electrode current collector 316 on the lid of the container 311. Further, in a state where the power storage unit 30 is arranged on the first exterior body 100, the power storage element 310 located at the lowermost portion (end on the minus side in the Z-axis direction) of the plurality of power storage elements 310 included in the power storage unit 30. The lid portion of the container 311 is arranged to face the welding portion 11 described later, and the first protruding portion 131d is arranged between the lid portion and the welding portion 11.

The electrode body 314 is a power generation element that includes a positive electrode, a negative electrode, and a separator and can store electricity. Specifically, the electrode body 314 is a winding type electrode body formed by winding what is arranged in a layer so that a separator is sandwiched between a positive electrode and a negative electrode. The electrode body 314 may be a laminated electrode body in which flat plate-shaped electrode plates are laminated.

Here, the positive electrode is an electrode plate in which a positive electrode active material layer is formed on the surface of a long strip-shaped conductive positive electrode current collecting foil made of aluminum or an aluminum alloy, and the negative electrode is made of copper or a copper alloy or the like. It is an electrode plate in which a negative electrode active material layer is formed on the surface of a long strip-shaped conductive negative electrode current collecting foil, and the separator is a microporous sheet. The positive electrode, negative electrode, and separator used in the power storage element 310 are not particularly different from those conventionally used, and known materials can be appropriately used as long as they do not impair the performance of the power storage element 310. Further, the type of electrolytic solution (non-aqueous electrolyte) sealed in the container 311 is not particularly limited as long as it does not impair the performance of the power storage element 310, and various types can be selected.

The positive electrode terminal 312 is an electrode terminal electrically connected to the positive electrode of the electrode body 314 via the positive electrode current collector 315, and the negative electrode terminal 313 is the negative electrode of the electrode body 314 via the negative electrode current collector 316. It is an electrode terminal electrically connected to. That is, the positive electrode terminal 312 and the negative electrode terminal 313 lead the electricity stored in the electrode body 314 to the external space of the power storage element 310, and the electricity is stored in the internal space of the power storage element 310 in order to store electricity in the electrode body 314. It is a metal electrode terminal for introducing.

A plurality of power storage elements 310 in the power storage unit 30 are connected in series or in parallel via the positive electrode terminal 312 and the negative electrode terminal 313. Further, the positive electrode terminal 312 of any of the power storage elements 310 is connected to the positive electrode external terminal 21 provided on the first exterior body 100, and the negative electrode terminal 313 of any of the power storage elements 310 is provided on the first exterior body 100. It is connected to the negative electrode external terminal 22.

The positive electrode current collector 315 is a member that is arranged between the positive electrode of the electrode body 314 and the side wall of the container 311 and has conductivity and rigidity that are electrically connected to the positive electrode terminal 312 and the positive electrode. The positive electrode current collector 315 is made of aluminum, an aluminum alloy, or the like, like the positive electrode current collector foil of the positive electrode. Further, the negative electrode current collector 316 is arranged between the negative electrode of the electrode body 314 and the side wall of the container 311 and has conductivity and rigidity which are electrically connected to the negative electrode terminal 313 and the negative electrode of the electrode body 314. It is a member. The negative electrode current collector 316 is made of copper, a copper alloy, or the like, like the negative electrode current collector foil of the negative electrode.

Next, the configuration of the electric device 40 will be described in detail.

FIG. 7 is a perspective view showing the configuration of the electric device 40 according to the embodiment of the present invention. Specifically, the figure shows the inside of the electric device 40 with the cover 44 of the electric device 40 removed.

The electric device 40 is included in a weak heat body whose function is deteriorated by heat. Specifically, as shown in the figure, the electric device 40 includes a support base 41, a circuit board 42 and a relay 43 arranged on the support base 41, and a cover 44 that covers the circuit board 42 and the relay 43. I have.

The support base 41 is a flat plate-shaped member for mounting the circuit board 42 and the relay 43. That is, after the circuit board 42 and the relay 43 are installed on the support base 41, the circuit board 42 and the relay 43 are housed inside the support base 41 and the cover 44 by attaching the cover 44 to the support base 41.

Further, the support base 41 and the cover 44 are formed of an insulating member such as resin. Therefore, by accommodating the circuit board 42 and the relay 43 inside the support base 41 and the cover 44, it is possible to prevent the circuit board 42 and the relay 43 from coming into contact with an external metal member or the like.

The circuit board 42 is an electric device that is electrically connected to at least one power storage element 310 among the power storage elements 310 included in the power storage unit 30, and is included in a weak heat body whose function is deteriorated by heat. The relay 43 is also included in the weak heat body whose function is deteriorated by heat.

Specifically, the circuit board 42 is a control board capable of acquiring, monitoring, and controlling the charge state and discharge state (battery state such as voltage and temperature) of a plurality of power storage elements 310, and is a wiring (wiring). The lead wire) is connected to the positive electrode terminal 312 or the negative electrode terminal 313 of the plurality of power storage elements 310. The circuit board 42 is provided with a control circuit (not shown) for performing the monitoring, controlling the on / off of the relay 43, and communicating with other devices, for example.

Further, the circuit board 42 is arranged between the power storage element 310 in the power storage unit 30 and the welding unit 11 described later, and is located closer to the welding unit 11 than the power storage element 310. Specifically, in a state where the electric device 40 is arranged on the first exterior body 100, the circuit board 42 is arranged in the vicinity of the welded portion 11 (more specifically, right beside it) and welded to the circuit board 42. The first protruding portion 131a is arranged between the portion 11 and the portion 11.

The electric device 40 may include a weak heat element such as an inverter circuit, which is different from the circuit board 42 and the relay 43 as described above. Alternatively, the electrical device 40 may include, as a weak heat element, a member made of a material having a melting point (or glass transition temperature) lower than a predetermined temperature.

Next, a method of manufacturing the power storage device 1 by joining the first exterior body 100 and the second exterior body 200 by heat welding will be described in detail with reference to FIGS. 8 to 10.

FIG. 8 is a flowchart showing a manufacturing method of the power storage device 1 according to the embodiment of the present invention. Specifically, the figure shows a method of manufacturing the power storage device 1 by joining the first exterior body 100 and the second exterior body 200 by heat welding.

As shown in the figure, the power storage unit 30 and the electric device 40 are arranged on the first exterior body 100 (S102).

Specifically, as shown in FIG. 9, the power storage unit 30 and the electric device 40 are arranged side by side in the X-axis direction on the first plane portion 110 of the first exterior body 100. FIG. 9 is a perspective view showing a configuration when the power storage unit 30 and the electric device 40 are arranged on the first exterior body 100 according to the embodiment of the present invention.

Here, if the electric device 40 is arranged above and below the power storage unit 30, the electric device 40 may be damaged by the vibration of the power storage device 1. Therefore, the electric device 40 is located on the side of the power storage unit 30 (X-axis direction). Alternatively, it is preferably arranged in the Y-axis direction). Further, in order to avoid the influence of heat due to the exhaust from the safety valve 317 of the power storage element 310 of the power storage unit 30, the electric device 40 is arranged on the side of the power storage unit 30 where the safety valve 317 is not arranged. Is preferable. Therefore, in the present embodiment, the electric device 40 is arranged on the side of the power storage unit 30 in the X-axis direction. The electric device 40 may be arranged on the side of the power storage unit 30 in the Y-axis direction where the safety valve 317 is not arranged.

Then, returning to FIG. 8, a hot plate is arranged on the first joint portion 133 of the first connection portion 130 of the first exterior body 100 (S104).

Specifically, as shown in FIG. 10A, a metal heated to about 300 ° C. on the first joint portion 133 (first joint portions 133a and 133c in the figure) of the first exterior body 100. A hot plate 500, which is a member, is arranged. FIG. 10 is a cross-sectional view showing a configuration in which a hot plate is arranged on the exterior body 10 according to the embodiment of the present invention to perform heat welding.

The length (height) of the first protruding portion 131 in the Z-axis direction is greater than the length of the tip portion of the hot plate 500 (the portion in contact with the first joint portion 133 and the second joint portion 231) in the Z-axis direction. Is also formed to be long. That is, the height of the first protruding portion 131 is formed to be higher than the height of the tip portion in a state where the lower surface of the tip portion of the hot plate 500 is in contact with the first joint portion 133. With this configuration, the influence of the heat of the hot plate 500 on the weak heat body can be reduced by the first protrusion 131.

Further, the length (height) of the power storage unit 30 in the Z-axis direction is longer (higher) than that of either the first exterior body 100 or the second exterior body 200. Therefore, the hot plate 500 is formed in an integral frame shape (square annular shape) so as not to interfere with the power storage unit 30, and the hot plate 500 is placed in a predetermined position so as to cover the power storage unit 30. I will move it.

The hot plate 500 does not have to be integrally formed, and even if it is divided into two or four parts, the hot plate 500 may have a frame shape as an overall shape. For example, two quadrangular annular shapes divided into two (U-shaped) may be combined, or a quadrangular annular shape lacking one side (U-shaped) may be combined with an I-shaped one. Alternatively, two L-shaped ones may be combined, or four I-shaped ones may be combined.

Then, returning to FIG. 8, the joint portion between the first exterior body 100 and the second exterior body 200 is heated (S106). That is, as a heating step, the joint portion between the first exterior body 100 and the second exterior body 200, which is arranged so as to sandwich the heat shield portion with the weak heat body, is heated.

Specifically, the first joint portion 133 of the first exterior body 100 arranged so as to sandwich the first protrusion 131 with the power storage unit 30 and the second joint portion 231 of the second exterior body 200 are shown in FIG. The hot plate 500 shown in (a) of 10 is pressed. As a result, the first joint portion 133 and the second joint portion 231 (in the figure, the first joint portion 133a, 133c and the second joint portion 231a, 231c) are heated. As long as the first joint portion 133 and the second joint portion 231 can be heated, the configuration is not limited to the configuration in which the hot plate 500 is pressed, and the first joint portion is formed by laser, ultrasonic welding, frictional heat, or the like. Any configuration may be used, such as a configuration for heating 133 and the second joint 231.

Then, returning to FIG. 8, the hot plate 500 is removed (S108). That is, from the state where the hot plate 500 is pressed against the first exterior body 100 and the second exterior body 200, the first exterior body 100 and the second exterior body 200 are once moved so as to be separated from each other in the Z-axis direction. , Remove the hot plate 500.

Then, the first exterior body 100 and the second exterior body 200 are joined by heat welding at the joint portion (S110). That is, as a joining step, the first connecting portion 130 of the first exterior body 100 and the second connecting portion 230 of the second exterior body 200 are joined by heat welding at the joining portion.

Specifically, as shown in FIG. 10B, the first exterior body 100 and the second exterior body 200 are brought close to each other again to bring the first exterior body 100 and the second exterior body 200 into contact with each other. Then, the first joint portion 133 of the first exterior body 100 and the second joint portion 231 of the second exterior body 200 are joined by heat welding. As a result, the welded portion 11 is formed. That is, as shown in the figure, the first joint portions 133a and 133c and the second joint portions 231a and 231c are joined to form the welded portions 11a and 11c. Similarly, the first joint portions 133b and 133d and the second joint portions 231b and 231d are joined to form the welded portions 11b and 11d.

As described above, the welded portion 11 is not formed at the tip of the first protruding portion 131 or the tip of the second protruding portion 132 (that is, the tip of the first exterior body 100 is not welded). It is a welded portion formed in the first joint portion 133 between the base end of the first protruding portion 131 and the base end of the second protruding portion 132.

In the heating step (S106 of FIG. 8), by pressing the hot plate 500 against either the first joint portion 133 or the second joint portion 231, any one of the first joint portion 133 and the second joint portion 231 is pressed. One may be heated. Also by this, in the joining step (S110 in FIG. 8), the first joining portion 133 and the second joining portion 231 can be joined by heat welding to form the welding portion 11.

Further, the first joint portion 133 may be provided with a protrusion protruding upward (plus side in the Z-axis direction), and the protrusion may be melted by the heat of the hot plate 500 to perform welding. Similarly, the second joint portion 231 is also provided with a protrusion protruding downward (minus side in the Z-axis direction), and a configuration in which welding is performed by the protrusion may be used.

Further, after arranging the power storage unit 30 and the electric device 40 inside the second exterior body 200, the joint portion between the first exterior body 100 and the second exterior body 200 is heated and joined by heat welding. It doesn't matter.

As described above, the first exterior body 100 and the second exterior body 200 are joined to manufacture the power storage device 1. Here, the positional relationship between the first exterior body 100, the second exterior body 200, the power storage unit 30, and the electric device 40 in a state where the first exterior body 100 and the second exterior body 200 are joined will be described.

FIG. 11 is a cross-sectional view showing a positional relationship between the first exterior body 100 and the second exterior body 200, the power storage unit 30, and the electric device 40 according to the embodiment of the present invention.

As shown in the figure, by joining the first exterior body 100 and the second exterior body 200, the first joint portion 133 and the second joint portion 231 are joined, and the welded portion 11 (in the figure, in the figure). , Welded portions 11a and 11c) are formed. That is, the welded portion 11 is a joint portion between the first exterior body 100 and the second exterior body 200 formed by joining the first exterior body 100 and the second exterior body 200 by heat welding.

Further, the first protruding portion 131a of the first exterior body 100 is arranged between the welding portion 11a and a weakly heated body such as a circuit board 42 in the electric device 40. Specifically, the circuit board 42 is arranged in the vicinity (right beside) of the welding portion 11a on the plus side in the X-axis direction so as to face the welding portion 11a. Further, a first protruding portion 131a is arranged between the circuit board 42 and the welding portion 11a.

Further, the first protruding portion 131c is arranged between the welding portion 11c and a weak heat element such as a power storage element 310 in the power storage unit 30. The same applies to the first protruding portions 131b and 131d. Specifically, the power storage element 310 at the bottom of the power storage unit 30 (the end on the minus side in the Z-axis direction) has welded portions 11b to 11d (the welded portion 11b is the welded portion on the plus side in the Y-axis direction, and the welded portion 11d is. It is arranged so as to face the welded portion on the minus side in the Y-axis direction). Further, in the lowermost power storage element 310, the lid portion of the container 311 is arranged so as to face the welding portion 11d, and the first protruding portion 131d is arranged between the lid portion and the welding portion 11d. There is.

As described above, the first protruding portion 131 is a heat shield portion for shielding heat generated by heat welding between the first exterior body 100 and the second exterior body 200, and is between the welded portion 11 and the weak heat body. Have been placed.

Further, the first protruding portion 131a is arranged so as to be separated from the electric device 40. That is, when the electric device 40 is arranged on the first exterior body 100, it is arranged apart from the first protruding portion 131a. For example, the first exterior body 100 is provided with a rib toward the electric device 40, and the rib is brought into contact with the cover 44 of the electric device 40 to bring the first protrusion 131a and the electric device 40 (circuit board 42) together. Can be placed apart. Alternatively, the first protruding portion 131a and the electric device 40 (circuit board 42) can be separated from each other by further providing a cover on the electric device 40 or simply arranging the first protruding portion 131a and the electric device 40 apart from each other. Can be placed.

Further, the first protruding portion 131c is arranged so as to be separated from the power storage unit 30. For example, similarly to the above, the first exterior body 100 is provided with a rib toward the power storage unit 30, and the rib is brought into contact with the power storage unit 30, so that the first protrusion 131c and the power storage unit 30 (power storage element 310) are brought into contact with each other. Can be placed apart from each other. Alternatively, by providing a cover on the power storage unit 30 or simply arranging the first protrusion 131c and the power storage unit 30 apart from each other, the first protrusion 131c and the power storage unit 30 (power storage element 310) are separated from each other. Can be placed.

In this way, the heat shield is arranged so as to be separated from the weak heat body. The same applies to the first protruding portions 131b and 131d.

As described above, according to the power storage device 1 according to the embodiment of the present invention, the function is deteriorated by heat and the welded portion 11 which is a joint portion between the first exterior body 100 and the second exterior body 200 by heat welding. A heat shield for shielding heat is provided between the generated weak heat body and the heat shield. Therefore, even when heat welding is used for joining the exterior body 10, the heat in the heat welding can be blocked by the heat shield, so that the influence of the heat on the weak heat body can be reduced. ..

Specifically, since the weak heat body includes the circuit board 42, it is possible to reduce the influence of heat in the heat welding between the first exterior body 100 and the second exterior body 200 on the circuit board 42.

More specifically, the circuit board 42 is arranged at a position closer to the welded portion 11 than the power storage element 310 (near the welded portion 11), but the heat shield portion is located between the circuit board 42 and the welded portion 11. Is arranged, the influence of heat in heat welding on the circuit board 42 can be reduced.

Further, since the weakly heated body includes the non-aqueous electrolyte secondary battery which is the power storage element 310, it is possible to reduce the influence of the heat in heat welding on the heat-sensitive non-aqueous electrolyte secondary battery.

Further, in the power storage element 310 arranged at the lowermost portion (end on the minus side in the Z-axis direction) of the power storage unit 30, the lid portion of the container 311 is arranged so as to face the welding portion 11, and the lid portion of the container 311 is arranged. A heat-sensitive resin packing is arranged in the container. Therefore, by arranging the heat shield portion between the power storage element 310 and the welding portion 11, it is possible to reduce the influence of heat in the heat welding on the packing.

Further, since the weak heat body includes a frame body made of resin such as a spacer 320, it is possible to reduce the influence of heat in heat welding on the frame body which is weak to heat.

Further, in the power storage device 1, the heat shield can be easily formed by providing the first exterior 100 with the first protrusion 131 protruding toward the second exterior 200 as the heat shield. it can. Further, by providing the first protruding portion 131, when the second exterior body 200 is arranged on the first exterior body 100, the second exterior body 200 may be fitted along the first protruding portion 131. The second exterior body 200 can be easily positioned with respect to the exterior body 100.

Further, since the second protruding portion 132 is provided in addition to the first protruding portion 131, the positions of the first exterior body 100 and the second exterior body 200 at the first protruding portion 131 and the second protruding portion 132. Matching can be done easily. Further, the second protruding portion 132 can hide the welded portion 11 so as not to be exposed to the outside of the power storage device 1, and can improve the appearance.

Further, the first protruding portion 131 of the first protruding portion 131 and the second protruding portion 132 sandwiching the welded portion 11 is formed so as to have a higher height. That is, since the first protrusion 131 only needs to function as a heat shield and the second protrusion 132 does not need to be formed high, the height of the first protrusion 131 is higher than that of the second protrusion 132. Is formed so as to be high. As a result, the influence of heat in heat welding on the weak heat body can be reduced.

Further, if the height of the second protruding portion 132 is high, the heat of the hot plate 500 may be trapped in the power storage device 1 due to the wall of the second protruding portion 132. Therefore, by forming the height of the second protruding portion 132 low, it is possible to prevent the heat of the hot plate 500 from being unnecessarily transferred to the inside of the power storage device 1.

Further, since the first protruding portion 131 is formed in an annular shape at the end of the first exterior body 100, it is possible to suppress heat transfer to the inside of the first protruding portion 131 formed in the annular shape. , The influence of heat in heat welding on weak heat bodies can be reduced.

Further, since the heat shield is arranged so as to be separated from the weak heat body, the heat in the heat welding is suppressed from being transferred to the weak heat body through the heat shield, and the effect of the heat on the weak heat body is suppressed. Can be reduced. In addition, it is possible to prevent the heat shield from hitting the weak heat body due to vibration or the like and damaging the weak heat body.

Further, according to the manufacturing method of the power storage device 1 according to the embodiment of the present invention, the joint portion between the first exterior body 100 and the second exterior body 200 arranged so as to sandwich the heat shield portion with the weak heat body. The first exterior body 100 and the second exterior body 200 are joined by heat welding at the joint portion. Therefore, even when heat welding is used for joining the exterior body 10, the heat shield can suppress the heat transfer in the heat welding to the weak heat body, so that the heat is transferred to the weak heat body. The effect can be reduced.

(Modification example 1)
Next, a modification 1 of the above embodiment will be described. In the above embodiment, the first exterior body 100 has two ribs, a first protruding portion 131 and a second protruding portion 132. However, in this modification, the first exterior body does not have the second protrusion 132.

FIG. 12 is a cross-sectional view showing the configurations of the first exterior body 100a and the second exterior body 200 according to the first modification of the embodiment of the present invention.

As shown in the figure, the first exterior body 100a has the first protruding portion 131 (in the figure, the first protruding portions 131a and 131c), but the second protruding portion 132 in the above embodiment is I don't have it.

Then, similarly to the above embodiment, the first joint portion 133 of the first exterior body 100a (in the figure, the first joint portions 133a and 133c) and the second joint portion 231 of the second exterior body 200 (in the same figure). , Second joint portions 231a and 231c) are joined by thermal welding to form a welded portion 11 (welded portions 11a and 11c in the figure).

As described above, the power storage device according to the present modification also has the same effect as that of the above embodiment. In particular, since the second protrusion 132 is not formed on the first exterior body 100a, the first exterior body 100a can be easily manufactured.

(Modification 2)
Next, a modification 2 of the above embodiment will be described. In the first modification, the first exterior body 100a has the first protrusion 131 but does not have the second protrusion, and the second exterior body 200 also does not have the protrusion. did. However, in this modification, the second exterior body has a second protrusion.

FIG. 13 is a cross-sectional view showing the configuration of the first exterior body 100a and the second exterior body 200a according to the second modification of the embodiment of the present invention.

As shown in the figure, the first exterior body 100a has a first protruding portion 131 (in the figure, the first protruding portions 131a and 131c), and the second exterior body 200a has a second protruding portion 232. (In the figure, the second protrusions 232a and 232c) are provided. Here, the second protruding portion 232 has the same shape as the second protruding portion 132 of the above embodiment.

Specifically, the second protruding portion 232 is an annular portion that hangs down from the outside of the second joint portion 231 (in the figure, the second joint portions 231a and 231c) toward the minus side in the Z-axis direction. Is. That is, the second protruding portion 232 is an annular protruding portion (rib) formed at the end of the second exterior body 200a on the first exterior body 100a side and projecting toward the first exterior body 100a.

Then, similarly to the above embodiment, the first joint portion 133 of the first exterior body 100a (first joint portions 133a and 133c in the figure) and the second joint portion 231 of the second exterior body 200a (in the same figure). The second joint portions 231a and 231c) are joined by heat welding to form the welded portion 11 (welded portions 11a and 11c in the figure). That is, the second protruding portion 232 is arranged so as to sandwich the first joint portion 133, the second joint portion 231 and the welded portion 11 with the first protruding portion 131.

As described above, the power storage device according to the present modification also has the same effect as that of the above embodiment. In particular, since the second exterior body 200a is provided with the second protrusion 232, the alignment between the first exterior body 100a and the second exterior body 200a can be easily performed. Further, the second protruding portion 232 can hide the welded portion 11 so as not to be exposed to the outside of the power storage device, so that the appearance can be improved.

(Modification 3)
Next, a modification 3 of the above embodiment will be described. In the above embodiment, the first exterior body 100 is a cover member, and the second exterior body 200 is a housing. On the other hand, in this modification, the first exterior body is the housing and the second exterior body is the cover member. That is, this modification is a configuration in which the configuration of the joint portion between the cover member and the housing is exchanged.

FIG. 14 is a cross-sectional view showing the configuration of the first exterior body 100b and the second exterior body 200b according to the third modification of the embodiment of the present invention.

As shown in the figure, the first exterior body 100b is a housing of a power storage device similar to the second exterior body 200 of the above embodiment, but the first exterior body 100b is the same as the first exterior body 100 of the above embodiment. It has one protruding portion 131, a second protruding portion 132, and a first joint portion 133. That is, the first exterior body 100b has a first protruding portion 131 and a second protruding portion 132 which are two ribs sandwiching the first joint portion 133.

Further, the second exterior body 200b is a cover member of the power storage device similar to the first exterior body 100 of the above embodiment, but the second connection portion 230 is similar to the second exterior body 200 of the above embodiment. Has a second joint 231 in the.

Then, similarly to the above embodiment, the first joint portion 133 of the first exterior body 100b and the second joint portion 231 of the second exterior body 200b are joined by heat welding to form the welded portion 11. ..

In this case, in the method of manufacturing the power storage device shown in FIG. 8, first, the power storage unit 30 and the electric device 40 are arranged (S102) inside the first exterior body 100b, which is a housing, and then the first exterior body. The joint portion between the 100b and the second exterior body 200b is heated and joined by heat welding (S104 to S110). After arranging the power storage unit 30 and the electric device 40 on the second exterior body 200b which is a cover member, the first exterior body 100b and the second exterior body 200b may be joined.

In addition, the above-mentioned modification 1 or 2 may be applied to this modification 3. That is, as in the above-mentioned modification 1, the first exterior body 100b may not have the second protruding portion 132, but may have only the first protruding portion 131. Alternatively, as in the above modification 2, the first exterior body 100b may not have the second protrusion 132, and the second exterior body 200b may have the second protrusion.

As described above, the power storage device according to the present modification also has the same effect as that of the above embodiment.

(Modification example 4)
Next, a modification 4 of the above embodiment will be described.

In this modification, the heat shield has a heat insulating part formed of a heat insulating material. That is, in the power storage device, a heat insulating portion formed of a heat insulating material is arranged between the weak heat body and the heat generation source so as to suppress the weak heat body from being affected by heat.

For example, when the weak heat element is an electric device 40 (or a circuit board 42 in the electric device 40, etc.), the heat shield portion is a first protrusion arranged between the welding portion 11 and the electric device 40. Part 131a and the like. When the weak heat body is a power storage unit 30 (or a power storage element in the power storage unit 30), the heat shield is a first protruding portion arranged between the welding unit 11 and the power storage unit 30. It is a part such as 131b to 131d.

Therefore, all or part of the heat shields such as the first protrusions 131a to 131d are formed of the heat insulating material as the heat insulating portion so as to suppress the weak heat body from being affected by heat. That is, as a heat insulating portion, a part of the first exterior body 100 is formed of a heat insulating material. The first exterior body 100 may be entirely formed of a heat insulating material, or a part or all of the second exterior body 200 may be formed of a heat insulating material.

When the weak heat body is the circuit board 42 or the relay 43 in the electric device 40, the heat shield is a cover 44 or the like that accommodates the circuit board 42 or the relay 43. Therefore, all or a part of the cover 44, which is a heat shield, is formed of a heat insulating material as a heat insulating portion so as to suppress the weak heat body from being affected by heat. That is, the heat insulating portion may be a cover that covers the weak heat body.

As described above, in this modification, the heat shield portion has a heat insulating portion formed of the heat insulating material. The heat insulating portion may be formed of a heat insulating material, or may be formed by being covered with a heat insulating material such as attaching a heat insulating tape. Further, as an example of the heat insulating material forming the heat insulating portion, there is a dammer material formed by accumulating and joining mica pieces.

As described above, the power storage device according to the present modification also has the same effect as that of the above embodiment. In particular, since the heat shield portion has a heat insulating portion formed of a heat insulating material, the heat insulating portion further suppresses the transfer of heat in heat welding to the weak heat body, and the heat is transferred to the weak heat body. The effect can be reduced.

Further, when the cover covering the weak heat body is formed of a heat insulating material, the cover further suppresses the transfer of heat in heat welding to the weak heat body and reduces the influence of the heat on the weak heat body. be able to.

Further, when a part or all of the first exterior body 100 or the second exterior body 200 is formed of a heat insulating material, the inside and the outside of the first exterior body 100 or the second exterior body 200 are heat-insulated. Can be done.

Although the power storage device according to the embodiment of the present invention and its modified example has been described above, the present invention is not limited to the above-described embodiment and its modified example. That is, it should be considered that the embodiments disclosed this time and examples thereof are examples in all respects and are not restrictive. The scope of the present invention is shown not by the above description but by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

For example, in the above-described embodiment and its modification, the electric device 40 or the power storage unit 30 is arranged as a weak heat element. However, it is decided that another electric device, a container made of a material having a melting point (or glass transition temperature) lower than a predetermined temperature, or the like is arranged as a weak heat element at the arrangement position of the electric device 40 or the power storage unit 30. You may.

Further, in the above-described embodiment and its modification, the height of the first protruding portion 131 is higher than that of the second protruding portion 132, but the height of the second protruding portion 132 is higher than that of the first protruding portion 131. It does not matter if the configuration is high.

Further, in the above-described embodiment and its modification, the heat shield portion is arranged so as to be separated from the weak heat body, but the heat shield portion may be partially in contact with the weak heat body. When the heat shield portion has a heat insulating portion as in the modified example 4, the influence of heat on the weak heat body can be reduced even if the heat insulating portion is in contact with the weak heat body.

Further, in the above-described embodiment and its modification, the weak heat body is arranged so as to face the welded portion. However, the weak heat body is not limited to being arranged so as to face the welded portion, and may be arranged close to the welded portion (near the welded portion). For example, in FIG. 11, when the power storage elements 310 are arranged in the X-axis direction or the Y-axis direction and the lid portion of the power storage element 310 as a weak heat element faces the minus side in the Z-axis direction, the case concerned. The lid portion is not opposed to the welded portion, but is arranged in close proximity to the welded portion.

Further, in the above-described embodiment and its modification, the power storage element 310 is a battery having a metal container 311. However, the power storage element 310 may be a laminated battery having a laminated container formed of a laminated film. In this case, since the laminated battery is sensitive to heat, it is assumed that the laminated battery which is the power storage element 310 is included in the weak heat body, and the heat shield portion is arranged between the laminated battery and the welding portion 11. The influence of heat in heat welding on the laminated battery can be reduced.

Further, in the above-described embodiment and its modification, the welded portion is a bonded portion formed by joining the first exterior body 100 and the second exterior body 200 by heat welding. However, the bonding between the first exterior body 100 and the second exterior body 200 is not limited to thermal welding, and may be welding such as ultrasonic welding. That is, the welded portion may be a bonded portion formed by joining the first exterior body 100 and the second exterior body 200 by welding such as ultrasonic welding. Even in this case, when heat is generated in the welded portion, the influence of the heat on the welded portion can be reduced by the heat shield portion arranged between the welded portion and the weakly heated body.

Further, a form constructed by arbitrarily combining the components included in the above-described embodiment and the modified examples thereof is also included in the scope of the present invention. For example, as described above, a configuration in which the modification 3 is applied to the modification 1 or 2 and a configuration in which the modification 4 is applied to the modifications 1 to 3 are also included in the scope of the present invention.

The present invention can be applied to a power storage device or the like in which one or more power storage elements are housed in an exterior body.

1 Power storage device 10 Exterior body 11, 11a, 11b, 11c, 11d Welding part 21 Positive electrode external terminal 22 Negative electrode external terminal 30 Power storage unit 31, 31a, 31b Holding member 32, 32a, 32b, 32c, 32d Restraint member 40 Electrical equipment 41 Support base 42 Circuit board 43 Relay 44 Cover 100, 100a, 100b First exterior body 110 First flat part 120 First side surface part 130 First connection part 131, 131a, 131b, 131c, 131d First protrusion 132, 132a, 132b, 132c, 132d, 232, 232a, 232c Second protruding part 133, 133a, 133b, 133c, 133d First joint part 200, 200a, 200b Second exterior body 210 Second flat part 220 Second side surface part 230 Second Connection part 231, 231a, 231b, 231c, 231d Second junction 310 Power storage element 311 Container 312 Positive electrode terminal 313 Negative electrode terminal 314 Electrode body 315 Positive electrode current collector 316 Negative electrode current collector 317 Safety valve 320 Spacer 500 Hot plate

Claims (11)

A power storage device including one or more power storage elements and a first exterior body and a second exterior body arranged outside the one or more power storage elements.
A welded portion that is a joint portion between the first exterior body and the second exterior body, which is formed by joining the first exterior body and the second exterior body by welding that generates heat.
An container arranged inside the exterior body composed of the first exterior body and the second exterior body, which is adjacent to the first power storage element included in the one or more power storage elements and the first power storage element. A spacer and an container containing at least one of the electric devices, which is a weak heat element whose function is deteriorated by the heat generated by the welding, and the container.
Wherein arranged between the welded portion and the contained object, and a plate-like portion that Nessu shield the heat between the contained object and the welding unit,
The first exterior body has a second protruding portion arranged so as to sandwich the welded portion with the plate-shaped portion.
The welded portion , the plate-shaped portion, and the second protruding portion are arranged on both sides of the container, and on both sides, the welded portion is more plate-shaped than the distance from the second protruding portion. A power storage device that is arranged apart from the plate-shaped portion so that the distance from the portion is larger . A power storage device including one or more power storage elements and a first exterior body and a second exterior body arranged outside the one or more power storage elements.
A welded portion that is a joint portion between the first exterior body and the second exterior body, which is formed by joining the first exterior body and the second exterior body by welding that generates heat.
An container arranged inside the exterior body composed of the first exterior body and the second exterior body, which is adjacent to the first power storage element included in the one or more power storage elements and the first power storage element. A spacer and an container containing at least one of the electric devices, which is a weak heat element whose function is deteriorated by the heat generated by the welding, and the container.
Wherein arranged between the welded portion and the contained object, and a plate-like portion that Nessu shield the heat between the contained object and the welding unit,
The first exterior body is a second protruding portion arranged so as to sandwich the welded portion with the plate-shaped portion, and the second exterior is more than the second protruding portion of the first exterior body. A power storage device having a second protruding portion that protrudes outward from the side surface of the portion opposite to the body . The welded portion is arranged in contact with the second protruding portion.
The power storage device according to claim 1 or 2. The one or more power storage elements include the first power storage element contained in the welded portion and the container facing the plate-shaped portion, and a second power storage element not facing the welded portion and the plate-shaped portion.
The power storage device according to any one of claims 1 to 3 . The power storage device according to any one of claims 1 to 4 , wherein the first exterior body has a first protruding portion projecting toward the second exterior body as the plate-shaped portion. The power storage device according to any one of claims 1 to 5 , wherein the plate-shaped portion is arranged apart from the contained object. The contents of claims 1 to 6 include at least one of a circuit board and a relay electrically connected to at least one of the one or more power storage elements of the electric device. The power storage device according to any one item. The circuit board is located between at least one power storage element of the one or more power storage elements and the welded portion, and is arranged at a position closer to the welded portion than the at least one power storage element. Item 7. The power storage device according to item 7 . The power storage device according to any one of claims 1 to 8 , wherein the contained object includes a non-aqueous electrolyte secondary battery which is the first power storage element. The power storage device according to any one of claims 1 to 9 , wherein the contained object includes the first power storage element having a lid portion arranged in the vicinity of the welded part. The power storage device according to any one of claims 1 to 10 , wherein the contained object includes a resin frame body as the spacer.

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