JP6743664B2 - Power storage device and method of manufacturing power storage device - Google Patents

Description

The present invention relates to a power storage device including a power storage element and a method of manufacturing a power storage device.

BACKGROUND ART Conventionally, there is known a power storage device including a power storage element and having a structure in which the power storage element is fixed in a case (see, for example, Patent Document 1). This power storage device includes a plurality of power storage elements (battery cells), and the power storage elements are fixed to the battery module case by being bonded with an adhesive or the like.

JP, 2010-97723, A

However, the above-described conventional power storage device has a problem that when the container of the power storage element swells due to an increase in internal pressure, the container may be damaged. In particular, when the container has a joint such as a weld, the joint may be damaged.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a power storage device and a method for manufacturing the power storage device that can suppress damage to the container of the power storage element.

In order to achieve the above object, a power storage device according to one embodiment of the present invention includes a container in which a joining portion in which two parts are joined is formed, and a power storage element having an electrode body housed in the container, The first region and the side placement part are arranged between a first region on the side of the joint part with respect to the central region on the side surface of the container and a side placement part that is placed on the side of the power storage element. And a first adhesive layer for adhering, a second region opposite to the first region on the side surface from the central region, and arranged between the lateral arrangement portion, the second region and the A second adhesive layer for adhering the lateral arrangement portion and an elastic member arranged between the central region and the lateral arrangement portion are provided.

Here, in the electricity storage device, the joint portion of the container of the electricity storage element may be weakened in strength due to a defective joint or the like, and the increase in the internal pressure of the container causes damage from the first region on the joint portion side of the side surface of the container. There is a risk. Therefore, the power storage device is provided with the first adhesive layer between the first region and the lateral arrangement portion, thereby suppressing expansion of the first region and suppressing damage to the first region. can do. Further, the power storage device, by providing a second adhesive layer between the second region on the side opposite to the first region on the side surface of the container and the lateral arrangement portion, the second region and the lateral arrangement portion. It is possible to prevent the gap from becoming small, and to prevent the first adhesive layer from peeling due to the inclination of the power storage element with respect to the lateral arrangement portion. In addition, the power storage device includes the elastic member between the central region on the side surface of the container and the lateral arrangement portion, so that the central region is suppressed while being locally pressed by the hard member. Swelling can be suppressed, and damage to the central region can be suppressed. As described above, according to the power storage device, it is possible to prevent the container of the power storage element from being damaged.

Further, the elastic member may have an elastic modulus equal to or lower than the elastic modulus of at least one of the first adhesive layer and the second adhesive layer.

According to this, since the elastic modulus of the elastic member is equal to or lower than the elastic modulus of at least one of the first adhesive layer and the second adhesive layer, the central region of the side surface of the container is locally pressed by the hard member. Can be further suppressed.

Further, the elastic member may be adhered to either the central region or the lateral arrangement portion.

According to this, the elastic member can be easily arranged at the time of manufacturing by adhering the elastic member to either the central region or the lateral arrangement portion. In addition, since the elastic member can be arranged at a desired position on the side surface of the container, for example, by disposing the elastic member at the most swelled position (center position or the like) on the side surface of the container, the elastic member can reduce the central region. It is possible to suppress the swelling of the central region by effectively pressing.

Further, at least one of the area and the width of the first adhesive layer as viewed from the normal direction of the side surface and the volume thereof may be larger than that of the second adhesive layer.

According to this, by forming at least one of the area, width, and volume of the first adhesive layer to be relatively large, the first region on the joint side is strongly reinforced and the first region is damaged. Can be effectively suppressed. Even if at least one of the area, width, and volume of the second adhesive layer is relatively small, the second adhesive layer can prevent the electric storage element from tilting with respect to the lateral arrangement portion.

Further, the first adhesive layer may be disposed between the joint portion and the lateral arrangement portion, and may adhere the joint portion and the lateral arrangement portion.

According to this, by arranging the first adhesive layer between the joint portion of the container and the lateral arrangement portion, the joint portion can be reinforced, and the occurrence of damage from the joint portion can be suppressed. You can

Further, the side surface has a protrusion protruding outward, and at least one of the first adhesive layer and the second adhesive layer is provided between the protrusion and the lateral arrangement portion. It may be arranged and the projection and the lateral arrangement part may be bonded.

Here, in a state where the container is swollen, stress concentrates on the protrusion formed by the side surface of the container being swollen. Therefore, by disposing at least one of the first adhesive layer and the second adhesive layer between the protrusion and the lateral arrangement portion on the side surface of the container, the strength of the protrusion is improved, and It is possible to suppress the occurrence of damage from the protruding portion.

Further, the elastic member has the center including a region where both the positive electrode mixture layer of the positive electrode plate and the negative electrode mixture layer of the negative electrode plate of the electrode body are located when viewed from the normal direction of the side surface of the container. It may be arranged in the area.

Here, in the range where the positive electrode mixture layer of the positive electrode plate and the negative electrode mixture layer of the negative electrode plate of the electrode body overlap, the container tends to swell most. Therefore, by disposing the elastic member in the central region including the region where both the positive electrode mixture layer and the negative electrode mixture layer are located, the elastic member can press the swelling range of the container. Can be prevented from swelling more than necessary.

Further, the first adhesive layer and the second adhesive layer are both a positive electrode composite material layer of a positive electrode plate and a negative electrode composite material layer of a negative electrode plate included in the electrode body when viewed from a normal direction of a side surface of the container. It may be arranged in the first region and the second region including a region outside the region where is located.

According to this, the first adhesive layer and the second adhesive layer are arranged in the first region and the second region including the region outside the region where both the positive electrode mixture layer and the negative electrode mixture layer are located. Thereby, even if the container swells in the range where the positive electrode mixture layer and the negative electrode mixture layer overlap, it is possible to prevent the container from swelling outside the range, and thus to prevent the electrode body from being displaced inside the container. can do.

Further, in order to achieve the above object, a method for manufacturing a power storage device according to one embodiment of the present invention includes a container in which a joint part in which two parts are joined is formed, and an electrode body housed in the container. A method of manufacturing a power storage device including a power storage element having, comprising: a first region on the side of the container that is closer to the joint than a central region, and a lateral disposition part that is disposed laterally of the power storage device. A first adhesive layer disposing step of disposing a first adhesive layer for adhering the first area and the lateral disposition part, and a second side of the side surface opposite to the first area from the central area. A second adhesive layer placement step of placing a second adhesive layer for bonding the second region and the lateral placement part between the region and the lateral placement part, and the central region and the lateral placement. And an elastic member disposing step of disposing an elastic member between the elastic member and the section.

According to this, in the method for manufacturing the power storage device, by disposing the first adhesive layer between the first region on the side of the joint on the side surface of the container and the lateral arrangement part, the first region is prevented from swelling. It is possible to suppress and prevent the first region from being damaged. Further, in the method for manufacturing the power storage device, by disposing the second adhesive layer between the second region on the side opposite to the first region on the side surface of the container and the lateral arrangement portion, the second region and the lateral region are disposed. It is possible to suppress a decrease in the distance from the disposition part, and suppress the peeling of the first adhesive layer due to the inclination of the power storage element with respect to the lateral disposition part. Further, in the method for manufacturing the power storage device, by disposing the elastic member between the central region of the side surface of the container and the lateral disposition portion, it is possible to suppress the central region from being locally pressed by the hard member. Swelling of the central region can be suppressed, and damage to the central region can be suppressed. As described above, according to the method of manufacturing the power storage device, it is possible to prevent the container of the power storage element from being damaged.

Further, in the elastic member arranging step, the elastic member may be arranged so as to be thinner than the first adhesive layer and the second adhesive layer.

According to this, in the method of manufacturing the power storage device, the elastic member is arranged so as to have a smaller thickness than the first adhesive layer and the second adhesive layer. This allows the central region of the container to swell and suppresses the force of the central region from swelling from affecting the adhesion of the first adhesive layer and the second adhesive layer.

Further, the present invention can be realized not only as such a power storage device and a manufacturing method thereof, but also as a power storage element, a first adhesive layer, a second adhesive layer and an elastic member included in the power storage device. it can.

According to the power storage device of the present invention, damage to the container of the power storage element can be suppressed.

FIG. 3 is a perspective view showing an external appearance of the power storage device according to the embodiment. FIG. 3 is an exploded perspective view showing each component when the power storage device according to the embodiment is disassembled. FIG. 3 is a perspective view showing an external appearance of the power storage element according to the embodiment. FIG. 4 is a side view showing a configuration in which a plurality of power storage elements according to the embodiment are housed inside an exterior body. It is a figure which shows the process of arrange|positioning the 1st adhesive layer, the 2nd adhesive layer, and the elastic member in the electrical storage element which concerns on embodiment. It is a figure which shows the process in which the 1st adhesive layer, the 2nd adhesive layer, and the elastic member are arrange|positioned between the adjacent electrical storage elements which concern on embodiment. FIG. 6 is a side view showing the arrangement positions of the first adhesive layer, the second adhesive layer, and the elastic member after the container of the electricity storage device according to the embodiment has swollen. FIG. 9 is a diagram showing a step of disposing a first adhesive layer, a second adhesive layer, and an elastic member between adjacent power storage elements according to the modified example 1 of the embodiment. FIG. 9 is a side view showing the arrangement positions of the first adhesive layer, the second adhesive layer, and the elastic member after the container of the electricity storage device according to the second modification of the embodiment is swollen. FIG. 9 is a side view showing the arrangement positions of the first adhesive layer, the second adhesive layer, and the elastic member after the container of the electricity storage device according to the second modification of the embodiment is swollen.

Hereinafter, with reference to the drawings, a power storage device according to an embodiment of the present invention and a modification thereof and a manufacturing method thereof will be described. It should be noted that the embodiments and modifications thereof described below are all comprehensive or specific examples. Numerical values, shapes, materials, components, arrangement positions and connection forms of components, steps in the manufacturing method, order of steps, and the like shown in the following embodiments and modifications thereof are examples, and the present invention is not limited to these. It is not meant to be limiting. Further, among the constituent elements in the following embodiments and the modifications thereof, constituent elements not described in the independent claim showing the highest concept are described as arbitrary constituent elements. In addition, the dimensions and the like in each drawing are not strictly illustrated.

In the following description and drawings, the X-axis direction is defined as the direction in which the storage elements are arranged, the direction in which the long side surfaces of the container of the storage element face each other, or the thickness direction of the container. Further, the direction in which the electrode terminals are arranged in one storage element or the direction in which the short side surface of the container of the storage element faces is defined as the Y-axis direction. Further, a direction in which the outer body of the power storage device and the lid are arranged, a direction in which the container body of the power storage device and the lid are arranged, or a vertical direction is defined as a Z-axis direction. The X-axis direction, the Y-axis direction, and the Z-axis direction are directions that intersect with each other (orthogonally in the present embodiment). Note that the Z-axis direction may not be the vertical direction depending on the usage mode, but in the following, for convenience of description, the Z-axis direction will be described as the vertical direction. Further, in the following description, for example, the X-axis direction plus side indicates the arrow direction side of the X-axis, and the X-axis direction minus side indicates the side opposite to the X-axis direction plus side. The same applies to the Y-axis direction and the Z-axis direction.

(Embodiment)
First, a general description of the power storage device 10 in the present embodiment will be given with reference to FIGS. 1 and 2. FIG. 1 is a perspective view showing the appearance of power storage device 10 according to the present embodiment. FIG. 2 is an exploded perspective view showing each component when power storage device 10 according to the present embodiment is disassembled.

Power storage device 10 is a device that can charge electricity from the outside and discharge electricity to the outside. For example, the power storage device 10 is a battery module used for power storage, power supply, and the like. Specifically, the power storage device 10 is, for example, a vehicle such as an electric vehicle (EV), a hybrid electric vehicle (HEV) or a plug-in hybrid electric vehicle (PHEV), a motorcycle, a watercraft, a snowmobile, an agricultural machine, and construction. It is used as a battery for driving a moving body such as a machine or for starting an engine.

Here, as shown in FIGS. 1 and 2, the power storage device 10 includes an outer package 11 including a first outer package 100 and a second outer package 200, and a plurality of power storage elements 300 accommodated inside the outer package 11. And a plurality of bus bars 400. In addition, inside the exterior body 11, an electric device such as a circuit board and a relay, a bus bar frame, or the like may be arranged.

The exterior body 11 is a rectangular (box-shaped) container (module case) that constitutes the exterior body of the power storage device 10. That is, the outer package 11 is arranged outside the plurality of power storage elements 300, the bus bar 400, etc., and the power storage elements 300, etc. are arranged at predetermined positions to protect them from impact and the like. The outer package 11 is made of an insulating material such as polycarbonate (PC), polypropylene (PP), polyethylene (PE), polyphenylene sulfide resin (PPS), polybutylene terephthalate (PBT) or ABS resin. This allows outer casing 11 to prevent power storage element 300 and the like from coming into contact with an external metal member or the like.

Here, the exterior body 11 includes a first exterior body 100 that constitutes a lid body of the exterior body 11 and a second exterior body 200 that constitutes a main body of the exterior body 11. The first exterior body 100 is a flat rectangular member that closes the opening of the second exterior body 200, and is provided with a positive electrode external terminal 110 and a negative electrode external terminal 120. Power storage device 10 charges electricity from the outside and discharges electricity to the outside through this positive electrode external terminal 110 and negative electrode external terminal 120. The second exterior body 200 is a bottomed rectangular tubular housing having an opening formed therein.

The power storage element 300 is a secondary battery (single battery) that can charge and discharge electricity, and more specifically, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. .. Power storage element 300 has a flat rectangular parallelepiped shape (square shape), and in the present embodiment, eight power storage elements 300 are arranged in the X-axis direction. Note that the shape of the power storage element 300 and the number of the power storage elements 300 arranged are not limited. Further, the electricity storage device 300 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 a capacitor, and further charged by the user. It may be a primary battery that can use stored electricity without being charged. A detailed description of the configuration of the storage element 300 will be given later.

The bus bar 400 is a rectangular plate-shaped member that is disposed on the plurality of power storage elements 300 and electrically connects the electrode terminals of the plurality of power storage elements 300. The bus bar 400 is also connected to the positive electrode external terminal 110 and the negative electrode external terminal 120. The bus bar 400 is formed of a conductive member made of metal such as copper, copper alloy, aluminum, and aluminum alloy.

In the present embodiment, bus bar 400 connects two power storage elements 300 in parallel to form four sets of power storage element groups, and connects the four sets of power storage element groups in series. In addition, the bus bar 400 includes a positive electrode terminal (a positive electrode terminal 320 described later) of two power storage elements 300 in the power storage element group arranged on the positive electrode external terminal 110 side (the positive side in the X-axis direction in FIG. 2) and a positive electrode external terminal. The terminal 110 is connected. Further, the bus bar 400 has negative electrode terminals (negative electrode current collector 360 described later) of two power storage elements 300 in the power storage element group arranged on the negative electrode external terminal 120 side (the negative side in the X-axis direction in FIG. 2 ), The negative electrode external terminal 120 is connected. It should be noted that bus bar 400 may have all eight power storage elements 300 connected in series, or may have another configuration.

Next, the configuration of power storage element 300 will be described in detail. FIG. 3 is a perspective view showing the external appearance of power storage element 300 according to the present embodiment. Note that the figure is a diagram showing the inside of the electricity storage device 300 as seen through the container 310 of the electricity storage device 300.

As shown in the figure, the electricity storage device 300 includes a container 310, a positive electrode terminal 320, and a negative electrode terminal 330. Further, an electrode body 340, a positive electrode current collector 350, and a negative electrode current collector 360 are arranged inside the container 310. An electrolytic solution (non-aqueous electrolyte) is also enclosed inside the container 310, but the illustration is omitted. In addition to the above components, a gasket may be arranged between the positive electrode terminal 320, the negative electrode terminal 330, the positive electrode current collector 350, the negative electrode current collector 360, and the container 310, or the electrode body 340 and the container. A spacer may be disposed between the spacer and the spacer 310.

The container 310 includes a bottom surface portion 311 on the Z axis direction negative side, long side surface portions 312 on both side surfaces in the X axis direction, short side surface portions 313 on both side surfaces in the Y axis direction, and a container on the Z axis direction positive side. It is a rectangular parallelepiped-shaped container having a lid 314. The bottom surface portion 311 is a rectangular portion that forms the bottom surface of the container 310, the long side surface portion 312 is a rectangular portion that forms the long side surface of the container 310, and the short side surface portion 313 is the short portion of the container 310. It is a rectangular portion that forms the side surface. Further, the container lid 314 is a rectangular member that constitutes the lid of the container 310. That is, the container 310 constitutes a container body having a bottom in the shape of a rectangular tube and having a bottom with the bottom surface portion 311, the two long side surface portions 312, and the two short side surface portions 313, and the container lid portion 314 forms the opening of the container body. It is configured to close.

Specifically, in the container 310, after the electrode body 340 and the like are housed inside the container body, the container body and the container lid 314 are joined by welding or the like to form the joint 310a, The inside can be sealed. That is, the container 310 is formed with a joint part 310a in which two parts (a bottom part 311, a container body composed of two long side parts 312 and two short side parts 313, and a container lid part 314) are joined. There is. The material of the container 310 (the container body and the container lid 314) is not particularly limited, but it is preferably a weldable (joinable) metal such as stainless steel, aluminum, or an aluminum alloy. Further, the container lid 314 is provided with a gas discharge valve that releases the pressure inside the container 310, but a detailed description thereof will be omitted.

The electrode body 340 is a power storage element (power generation element) capable of storing electricity, includes a positive electrode plate, a negative electrode plate, and a separator, and is formed by stacking the positive electrode plate, the negative electrode plate, and the separator in the X-axis direction. There is. Specifically, the electrode body 340 is a winding-type electrode formed by winding a positive electrode plate, a negative electrode plate, and a separator around a winding axis (a virtual axis in the Y-axis direction that penetrates the center of the electrode body 340). The body is electrically connected to the positive electrode current collector 350 and the negative electrode current collector 360.

The positive electrode plate is an electrode plate in which a positive electrode mixture layer is formed on the surface of a positive electrode base material layer which is a long strip-shaped metal foil made of aluminum, aluminum alloy or the like. The negative electrode plate is an electrode plate in which a negative electrode mixture layer is formed on the surface of a negative electrode base material layer which is a long strip-shaped metal foil made of copper or a copper alloy. The separator is a microporous sheet made of resin. As the positive electrode active material and the negative electrode active material used for the positive electrode composite material layer and the negative electrode composite material layer, known materials can be appropriately used as long as they are active materials capable of inserting and extracting lithium ions. Also for the separator, a known material can be appropriately used as long as it does not impair the performance of the electricity storage device 300.

Here, the electrode body 340 is formed by winding a layered structure in which a separator is sandwiched between a positive electrode plate and a negative electrode plate. Specifically, the electrode body 340 is wound such that the positive electrode plate and the negative electrode plate are offset from each other in the winding axis direction (Y-axis direction) via the separator. Then, the positive electrode plate and the negative electrode plate are portions where the base material layer is exposed without coating the composite material (the composite material layer is not formed) at the end portions in the respective shifted directions (the composite material layer is not formed). Section). Specifically, the electrode body 340 has a positive electrode side end portion 341 in which the composite material layer non-forming portion of the positive electrode plate is laminated at one end in the winding axis direction (end portion on the Y axis direction positive side). There is. Similarly, the electrode body 340 has a negative electrode side end portion 342 where the composite material layer non-forming portion of the negative electrode plate is laminated at the other end in the winding axis direction (the end portion on the negative side in the Y axis direction). ing.

Further, since the electrode body 340 has an elliptical shape when viewed from the winding axis direction (Y-axis direction), the elliptical linear portion has a flat shape and the elliptic curved portion has a curved shape. It becomes the shape. Therefore, the electrode body 340 has a pair of opposing flat portions 343 and a pair of opposing curved portions 344. Specifically, the pair of flat portions 343 are flat portions disposed on both sides of the electrode body 340 in the X-axis direction in the region where the composite material layer of the positive electrode plate and the negative electrode plate is formed. The pair of curved portions 344 are curved portions (substantially U-shaped) that connect the pair of flat portions 343 in the region where the composite material layer of the positive electrode plate and the negative electrode plate is formed.

That is, the pair of flat portions 343 are regions that face (abut) the long side surface portion 312 of the container 310 when the electrode body 340 is arranged inside the container 310. When the insulating sheet is arranged between the electrode body 340 and the container 310, the flat portion 343 indirectly contacts the long side surface portion 312 via the insulating sheet. Further, when the electrode body 340 is taken out from the container 310, the flat portion 343 is also a portion that becomes flat when the electrode body 340 is pressed in the X-axis direction.

The positive electrode current collector 350 is disposed between the positive electrode plate of the electrode body 340 and the side wall of the container 310, and has conductivity and rigidity that are electrically connected to the positive electrode terminal 320 and the positive electrode plate of the electrode body 340. It is a member. In addition, the negative electrode current collector 360 is disposed between the negative electrode plate of the electrode body 340 and the side wall of the container 310, and has conductivity and rigidity that are electrically connected to the negative electrode terminal 330 and the negative electrode plate of the electrode body 340. It is a member provided with. Specifically, the positive electrode current collector 350 is joined to the positive electrode side end 341 of the electrode body 340 by welding or the like, and the negative electrode current collector 360 is joined to the negative electrode side end 342 of the electrode body 340 by welding or the like. ing. The positive electrode current collector 350 is made of aluminum or an aluminum alloy as in the positive electrode substrate layer of the positive electrode plate, and the negative electrode current collector 360 is made of copper or copper alloy as in the negative electrode substrate layer of the negative electrode plate. Is formed by.

The positive electrode terminal 320 is an electrode terminal electrically connected to the positive electrode plate of the electrode body 340 via the positive electrode current collector 350, and the negative electrode terminal 330 is connected to the electrode body 340 via the negative electrode current collector 360. It is an electrode terminal electrically connected to the negative electrode plate. That is, the positive electrode terminal 320 and the negative electrode terminal 330 lead the electricity stored in the electrode body 340 to the external space of the power storage element 300, and generate electricity in the internal space of the power storage element 300 to store the electricity in the electrode body 340. Is a metal electrode terminal for introducing. The positive electrode terminal 320 and the negative electrode terminal 330 are made of aluminum, an aluminum alloy, or the like.

Next, a configuration in which a plurality of power storage elements 300 are housed inside the outer package 11 will be described. FIG. 4 is a side view showing a configuration in which a plurality of power storage elements 300 according to the present embodiment are housed inside exterior body 11. Specifically, in the figure, a state in which a plurality of (four in the figure) power storage elements 300 are arranged and placed on the second exterior body 200 of the exterior body 11 is shown on the negative side in the Y-axis direction. It is the figure seen from.

As shown in the figure, in the plurality of power storage devices 300, the bottom surface portion 311 of each container 310 abuts on the bottom surface of the second exterior body 200 of the exterior body 11, and the container lid portion 314 of each container 310 is disposed. It is housed inside the exterior body 11 so as to face upward. In addition, in the plurality of power storage elements 300, the long side surface portions 312 of the respective containers 310 are swollen due to an increase in the internal pressure of the respective containers 310. Then, the first adhesive layer 510, the second adhesive layer 520, and the elastic member 530 are arranged between the long side surface portions 312 of the containers 310 of the two adjacent power storage devices 300.

Here, the first adhesive layer 510 is disposed on the joint portion 310a side of the long side surface portion 312 of the container 310, and adheres the joint portion 310a sides of the long side surface portions 312 of the containers 310 of two adjacent power storage devices 300 to each other. It is an adhesive layer. In addition, the second adhesive layer 520 is disposed on the opposite side of the long side surface portion 312 of the container 310 from the joint portion 310a, and is opposite to the joint portion 310a of the long side surface portions 312 of the containers 310 of two adjacent power storage devices 300. It is an adhesive layer that bonds the sides together. The elastic member 530 is an elastic member that is disposed in the central region of the long side surface portion 312 of the container 310 and is sandwiched between the central regions of the long side surface portions 312 of the containers 310 of two adjacent power storage devices 300. ..

The first adhesive layer 510, the second adhesive layer 520, and the elastic member 530 will be described in more detail. In the following, the first adhesive layer 510 and the second adhesive layer 520 will be described while focusing on the steps of forming the first adhesive layer 510, the second adhesive layer 520, and the elastic member 530 in the method for manufacturing the electricity storage device 10. The structure of the elastic member 530 will be described.

First, a process of disposing the first adhesive layer 510, the second adhesive layer 520, and the elastic member 530 on the electricity storage device 300 will be described. FIG. 5 is a diagram showing a process of disposing the first adhesive layer 510, the second adhesive layer 520, and the elastic member 530 in the electricity storage device 300 according to the present embodiment. Specifically, (a) of the same figure is a side view seen from the X-axis direction plus side, showing the internal configuration of the storage element 300 through the container 310 of the storage element 300. Further, (b) of the same figure is a side view seen from the X-axis direction plus side, showing a state in which the first adhesive layer 510, the second adhesive layer 520, and the elastic member 530 are arranged in the electricity storage device 300.

First, as shown in FIG. 5A, a central region of a side surface (a surface on the plus side in the X-axis direction in the figure) of the container 310 of the electricity storage device 300 is defined as a central region 310b. Further, a region on the side surface of the container 310 closer to the joint portion 310a (Z-axis direction plus side) than the central region 310b is referred to as a first region 310c. Further, a region on the side surface of the container 310, which is on the opposite side of the central region 310b from the first region 310c (on the negative side in the Z-axis direction), is referred to as a second region 310d. The side surface of the container 310 is a surface formed by the long side surface portion 312 of the container 310 and the side surface of the container lid portion 314 (the surface on the plus side in the X-axis direction in the figure).

Then, as shown in FIG. 5B, the first adhesive layer 510 is arranged in the first region 310 c of the container 310, the second adhesive layer 520 is arranged in the second region 310 d of the container 310, and The elastic member 530 is arranged in the central region 310b.

Specifically, the adhesive is applied in a long shape in the Y-axis direction over almost the entire first region 310c to form the first adhesive layer 510. As a result, the first adhesive layer 510 has a position corresponding to almost the entire bonding portion 310a in the first region 310c and the upper portions of the positive electrode current collector 350 and the negative electrode current collector 360 when viewed in the X-axis direction. It is arranged to cover. Further, the second region 310d is also coated with the adhesive in a long shape in the Y-axis direction to form the second adhesive layer 520. Specifically, the second adhesive layer 520 is arranged in the second region 310d at a position closer to the bottom face 311 side (Z-axis direction negative side) than the boundary line between the central region 310b and the second region 310d. To be done.

Here, the first adhesive layer 510 is larger than the second adhesive layer 520 in at least one of the area and the width when viewed from the normal direction (X-axis direction) of the side surface of the container 310, and the volume. .. In the present embodiment, the first adhesive layer 510 has an area when viewed from the normal direction of the side surface, a width when viewed from the normal direction of the side surface (Z-axis direction), as compared with the second adhesive layer 520. Width), and the adhesive is applied so that the entire volume becomes large.

Further, a rectangular adhesive is applied to the central portion of the central region 310b as well, so that the elastic member 530 is formed. That is, an adhesive having elasticity even when dried is applied to the central region 310b to form the elastic member 530. Further, the elastic member 530 is formed to be thinner than the first adhesive layer 510 and the second adhesive layer 520 (see FIG. 6). The elastic member 530 may be formed thinner than any of the maximum thickness, the average thickness, and the minimum thickness of the first adhesive layer 510 and the second adhesive layer 520, but is formed thinner than the minimum thickness. Is preferred. Here, the thickness is the thickness in the arrangement direction (X-axis direction) of the plurality of power storage elements 300.

As described above, in the present embodiment, the adhesive is sequentially applied to the first region 310c, the second region 310d, and the central region 310b to form the first adhesive layer 510, the second adhesive layer 520, and the elastic member 530. To be done. The adhesive used for the first adhesive layer 510, the second adhesive layer 520, and the elastic member 530 may be any adhesive, but productivity can be improved by using the same type of adhesive. You can As the adhesive used for the first adhesive layer 510, the second adhesive layer 520, and the elastic member 530, a gel resin material can be used, but a liquid one or a hot melt adhesive. It is also possible to use a solid material such as.

Further, as shown in FIG. 5A, the central region 310b is a region corresponding to the flat portion 343 of the electrode body 340 and the central portions of the positive electrode side end portion 341 and the negative electrode side end portion 342 in the Z-axis direction. This is the area that contains it. The first region 310c and the second region 310d are regions including regions corresponding to the curved portion 344 of the electrode body 340 and the Z-axis direction end portions of the positive electrode side end portion 341 and the negative electrode side end portion 342.

The elastic member 530 is arranged in a region corresponding to the flat portion 343 in the central region 310b. That is, the elastic member 530 is viewed from the normal direction (X-axis direction) of the side surface of the container 310 (the surface on the plus side in the X-axis direction in the figure) and the positive electrode mixture layer and the negative electrode of the positive electrode plate included in the electrode body 340. It is arranged in the central region 310b including the region where both the negative electrode mixture layer of the plate is located. Further, the first adhesive layer 510 and the second adhesive layer 520 correspond to the curved portions 344 in the first region 310c and the second region 310d and the Z-axis direction end portions of the positive electrode side end portion 341 and the negative electrode side end portion 342, respectively. It is located in the area. That is, the first adhesive layer 510 and the second adhesive layer 520 are the positive electrode mixture layer of the positive electrode plate included in the electrode body 340 when viewed from the normal direction (X-axis direction) of the side surface (long side surface portion 312) of the container 310. And the negative electrode mixture layer of the negative electrode plate are arranged in the first region 310c and the second region 310d including the region outside the region.

Next, a process of disposing the first adhesive layer 510, the second adhesive layer 520, and the elastic member 530 between the adjacent power storage devices 300 will be described. FIG. 6 is a diagram showing a process in which the first adhesive layer 510, the second adhesive layer 520, and the elastic member 530 are arranged between the adjacent power storage devices 300 according to the present embodiment. Specifically, (a) of the same figure is a side view seen from the Y axis direction minus side, showing a state before the container 310 of the electricity storage device 300 is expanded. Further, (b) of the same figure is a side view seen from the Y axis direction minus side, showing a state after the container 310 of the electricity storage device 300 is swollen.

First, as shown in (a) of FIG. 6, on the side of the power storage device 300 on which the first adhesive layer 510, the second adhesive layer 520 and the elastic member 530 are arranged (in the figure, the plus side in the X-axis direction), A lateral arrangement portion, which is a member different from that of the electricity storage device 300, is arranged. In the present embodiment, another power storage element 300 is arranged as the lateral arrangement portion. Since the lateral arrangement portion is the electricity storage device 300, the first adhesive layer 510, the second adhesive layer 520, and the elastic member 530 are similarly provided on the side surface on the plus side in the X-axis direction in the lateral arrangement portion. Although they are arranged, they are omitted in the figure. Then, the electricity storage device 300 and the lateral arrangement portion are adhered by the first adhesive layer 510 and the second adhesive layer 520.

That is, the first adhesive layer 510 includes the first region 310c on the side surface of the container 310 that is closer to the joint portion 310a than the central region 310b, and the lateral arrangement portion that is arranged laterally to the electricity storage device 300 (other electricity storage device 300). ), and an adhesive layer for adhering the first region 310c and the lateral arrangement portion. The first adhesive layer 510 is arranged between the joint portion 310a and the lateral arrangement portion and adheres the joint portion 310a and the lateral arrangement portion. That is, the first adhesive layer 510 is disposed between the first regions 310c of the two adjacent power storage elements 300 and bonds the first regions 310c to each other. In addition, the first adhesive layer 510 is disposed between the joint portions 310a of two adjacent power storage elements 300 and adheres the joint portions 310a to each other.

In addition, the second adhesive layer 520 is arranged between the second region 310d on the side surface of the container 310 on the side opposite to the first region 310c with respect to the central region 310b and the lateral arrangement portion, and the second region 310d is formed. It is an adhesive layer that adheres to the lateral arrangement portion. That is, the second adhesive layer 520 is disposed between the second regions 310d of the two adjacent power storage devices 300 and adheres the second regions 310d to each other.

The elastic member 530 is an elastic member arranged between the central region 310b on the side surface of the container 310 and the lateral arrangement portion. That is, the elastic member 530 is arranged between the central regions 310b of the two adjacent power storage devices 300. Further, the elastic member 530 is bonded to either the central region 310b or the lateral arrangement portion. In the present embodiment, elastic member 530 is adhered to central region 310b without being adhered to the lateral arrangement portion (that is, separated from the lateral arrangement portion). In this way, the elastic member 530 is arranged between the central region 310b and the lateral arrangement portion without adhering the central region 310b and the lateral arrangement portion. Then, the storage element 300 and the lateral arrangement portion are arranged inside the exterior body 11 with the elastic member 530 and the lateral arrangement portion separated from each other. For this reason, the surface of the elastic member 530 on the plus side in the X-axis direction becomes dry and loses its adhesiveness over time.

Then, as shown in (b) of FIG. 6, as the internal pressure of container 310 of power storage element 300 increases due to the use of power storage device 10 over time, the side surfaces of container 310 (surfaces on both sides in the X-axis direction) swell. As a result, the first adhesive layer 510 and the second adhesive layer 520 are pressed against the power storage element 300 and the lateral arrangement portion from both sides in the X-axis direction. The surface of the elastic member 530 on the plus side in the X-axis direction abuts the lateral arrangement portion. Even in this state, the elastic member 530 is formed thinner than any one of the maximum thickness, the average thickness, and the minimum thickness of the first adhesive layer 510 and the second adhesive layer 520. Is also thinly formed.

As described above, in the method for manufacturing the power storage device 10, as the first adhesive layer arranging step, the first region 310c and the lateral arranging part are bonded between the first region 310c and the lateral arranging part of the container 310. The first adhesive layer 510 is placed. Further, as the second adhesive layer arranging step, the second adhesive layer 520 for adhering the second region 310d and the lateral arrangement portion is arranged between the second region 310d and the lateral arrangement portion of the container 310. Further, as the elastic member arranging step, the elastic member 530 is arranged between the central region 310b of the container 310 and the lateral arrangement portion. In the elastic member arranging step, the elastic member 530 is arranged so as to have a smaller thickness than the first adhesive layer 510 and the second adhesive layer 520.

Note that, although the two power storage elements 300 (the power storage element 300 and the laterally arranged portion) are described above, a plurality of power storage elements 300 (in the present embodiment, eight power storage elements 300) are arranged in the X-axis direction. By being arranged inside the exterior body 11, the state shown in FIG. 4 is obtained.

Here, the arrangement positions of the first adhesive layer 510, the second adhesive layer 520, and the elastic member 530 in the state shown in FIG. 4 or 6B (the state after the container 310 is swollen) will be described. FIG. 7 is a side view showing the arrangement positions of first adhesive layer 510, second adhesive layer 520, and elastic member 530 after container 310 of power storage device 300 according to the present embodiment is swollen. Specifically, this figure is a side view seen from the X-axis direction plus side with the lateral arrangement portion (the X-axis direction plus side power storage element 300) removed from the configuration of FIG. 6B.

As shown in FIG. 7, the container 310 is swollen on its side surface (the surface on the plus side in the X-axis direction in the figure), so that outwardly projecting (bulging) protruding portions 310e and 310f are formed on the side surface. It is formed. The protruding portion 310e is a ridge line formed on the outer peripheral portion of the long side surface portion 312 by bulging the central portion of the long side surface portion 312 outward, and the four protruding portions 310e are provided at the four corners of the long side surface portion 312. It is arranged radially. That is, the protrusions 310e are arranged on both sides of the first region 310c in the Y-axis direction, and the protrusions 310e are arranged on both sides of the second region 310d in the Y-axis direction. In addition, the protruding portion 310f is a ridge line formed in the central portion of the long side surface portion 312 by bulging outward, and the four protruding portions 310f are annularly arranged in the central portion. There is. That is, four protrusions 310f are arranged in a rectangular ring shape in the central region 310b so as to surround the elastic member 530 in the central region 310b on all sides.

In addition, at least one of the first adhesive layer 510 and the second adhesive layer 520 is arranged between the protrusion 310e and the lateral arrangement portion, and adheres the protrusion 310e and the lateral arrangement portion. In the present embodiment, both the first adhesive layer 510 and the second adhesive layer 520 are arranged between the protrusion 310e and the lateral arrangement portion, and the protrusion 310e and the lateral arrangement portion are adhered to each other. There is. That is, the first adhesive layer 510 and the second adhesive layer 520 are also disposed on the protrusion 310e, so that the first adhesive layer 510 and the second adhesive layer 520 are disposed between the protrusions 310e of the two adjacent power storage elements 300, and the protrusion 310e. They are glued together.

As described above, according to power storage device 10 according to the embodiment of the present invention, joint portion 310a of container 310 of power storage element 300 may be weakened in strength due to a defective joint or the like. The rise may damage the first region 310c on the side of the joint 310a on the side surface of the container 310. For this reason, the power storage device 10 includes the first adhesive layer 510 between the first region 310c and the lateral arrangement portion, thereby suppressing the swelling of the first region 310c and damaging the first region 310c. Can be suppressed. In addition, the power storage device 10 includes the second adhesive layer 520 between the second region 310d on the side opposite to the first region 310c on the side surface of the container 310 and the lateral arrangement portion, so that the second region 310d and the side are disposed. It is possible to suppress a decrease in the distance from the lateral arrangement portion and to prevent the first adhesive layer 510 from peeling due to the inclination of the power storage element 300 with respect to the lateral arrangement portion. Further, the power storage device 10 includes the elastic member 530 between the central region 310b on the side surface of the container 310 and the lateral arrangement portion, thereby suppressing the central region 310b from being locally pressed by a hard member. Swelling of the central region 310b can be suppressed, and damage to the central region 310b can be suppressed. As described above, according to the power storage device 10, damage to the container 310 of the power storage element 300 can be suppressed.

Further, even if the container 310 of the electricity storage device 300 tries to swell, it is possible to prevent the side surface of the container 310 from being pressed by the first adhesive layer 510, the second adhesive layer 520, and the elastic member 530 and swelling the side surface. The movement of the electrode body 340 inside the container 310 can be restricted. Further, since the central region 310b of the container 310 is not adhered to the lateral arrangement portion, the movement of the central region 310b is not restricted. Therefore, even when the central region 310b tries to swell, it is possible to prevent the force of the central region 310b from swelling from being transmitted to the first region 310c and the second region 310d, and thus the first adhesive layer 510. Also, it is possible to suppress the influence on the adhesion of the second adhesive layer 520.

Further, by bonding the elastic member 530 to either one of the central region 310b and the lateral arrangement portion, the elastic member 530 can be easily arranged at the time of manufacturing. Further, since the elastic member 530 can be arranged at a desired position on the side surface of the container 310, for example, by disposing the elastic member 530 at the most swollen position (center position or the like) on the side surface of the container 310, the elastic member 530 can be arranged. Effectively compresses the central region 310b to prevent the central region 310b from expanding.

In addition, by forming at least one of the area, width, and volume of the first adhesive layer 510 to be relatively large, the first region 310c on the joint portion 310a side is strongly reinforced, and the first region 310c is damaged. Can be effectively suppressed. Even if at least one of the area, width, and volume of the second adhesive layer 520 is relatively small, the second adhesive layer 520 can prevent the electric storage element 300 from tilting with respect to the lateral arrangement portion.

Further, by disposing the first adhesive layer 510 between the joint portion 310a of the container 310 and the lateral arrangement portion, it is possible to reinforce the joint portion 310a and prevent the joint portion 310a from being damaged. You can

Further, when the container 310 is swollen, stress concentrates on the protruding portion 310e formed by the side surface of the container 310 being swollen. Therefore, the strength of the protrusion 310e is improved by disposing at least one of the first adhesive layer 510 and the second adhesive layer 520 between the protrusion 310e on the side surface of the container 310 and the lateral arrangement portion. Thus, it is possible to prevent the protrusion 310e from being damaged.

Further, in the range where the positive electrode mixture layer of the positive electrode plate and the negative electrode mixture layer of the negative electrode plate of the electrode assembly 340 overlap (within the region corresponding to the flat portion 343), the container 310 tends to swell most. Therefore, by arranging the elastic member 530 in the central region 310b including the region (the region corresponding to the flat portion 343) where both the positive electrode mixture layer and the negative electrode mixture layer are located, the expansion range of the container 310 can be reduced. Since the elastic member 530 can be pressed, it is possible to prevent the range from swelling more than necessary.

Further, the first adhesive layer 510 and the second adhesive layer 520 are arranged in the first region 310c and the second region 310d including the regions outside the regions where both the positive electrode mixture layer and the negative electrode mixture layer are located. Accordingly, even if the container 310 swells in the range where the positive electrode composite material layer and the negative electrode composite material layer overlap, it is possible to prevent the container 310 from swelling outside the range, so that the electrode body 340 is disposed inside the container 310. The shift can be suppressed.

In particular, since the first adhesive layer 510 is disposed so as to cover the positions corresponding to the positive electrode current collector 350 and the negative electrode current collector 360 in the first region 310c, the positive electrode current collector 350 and the negative electrode current collector. It is possible to prevent the container 310 from expanding at the position of 360. Therefore, the first adhesive layer 510 can restrict the movement of the positive electrode current collector 350 and the negative electrode current collector 360, and can prevent the electrode body 340 from being displaced inside the container 310.

Further, the elastic member 530 is arranged so as to have a smaller thickness than the first adhesive layer 510 and the second adhesive layer 520. Accordingly, the central region 310b of the container 310 is allowed to swell, and the force of the central region 310b trying to swell is suppressed from affecting the adhesion of the first adhesive layer 510 and the second adhesive layer 520. You can Further, if there is excess adhesive in the first region 310c and the second region 310d, the excess adhesive can flow into the central region 310b. For this reason, it is possible to suppress the excess adhesive from protruding outward from the first region 310c and the second region 310d, and it is possible to reduce the inability to assemble due to the adhesive protruding. In addition, the amount of the elastic member 530 used can be reduced to achieve cost reduction and weight reduction.

Further, according to the method for manufacturing power storage device 10 according to the embodiment of the present invention, in the first adhesive layer disposing step, the first adhesive layer is provided between the first region 310c on the side surface of container 310 and the side disposing portion. By disposing 510, it is possible to prevent the first region 310c from swelling and prevent the first region 310c from being damaged. Further, in the second adhesive layer arranging step, by disposing the second adhesive layer 520 between the second region 310d on the side surface of the container 310 and the lateral arranging part, the second region 310d and the lateral arranging part are formed. It is possible to prevent the gap from becoming small and to prevent the first adhesive layer 510 from peeling due to the inclination of the power storage element 300 with respect to the lateral arrangement portion. Further, in the elastic member disposing step, by disposing the elastic member 530 between the central region 310b on the side surface of the container 310 and the side disposing portion, it is possible to suppress the central region 310b from being locally pressed by a hard member. At the same time, it is possible to prevent the central region 310b from expanding and prevent the central region 310b from being damaged. As described above, according to the method for manufacturing power storage device 10, it is possible to prevent damage to container 310 of power storage element 300.

(Modification 1)
Next, a first modification of the above embodiment will be described. FIG. 8: is a figure which shows the process of arrange|positioning the 1st adhesive layer 511, the 2nd adhesive layer 521, and the elastic member 531 between the adjacent electrical storage elements 301 which concern on the modified example 1 of this Embodiment. Note that this figure is a diagram corresponding to FIG. 6.

As shown in (a) of FIG. 8, the electricity storage device 301 according to the present modification includes a container 315 whose width in the X-axis direction is narrower on the bottom surface 311 side than on the container lid 314 side. There is. That is, in the electricity storage device 301, the container 315 is manufactured by drawing, and the container 315 has a bottom surface 311 rather than the container lid 314 so that the container 315 can be easily pulled out from the mold during the drawing. The width on the side is narrower in the X-axis direction (thinner is thinner).

Then, the first adhesive layer 511, the second adhesive layer 521, and the elastic member 531 are arranged on the side surface (the surface on the X axis direction positive side in the figure) of the container 315 having such a shape. That is, the first adhesive layer 511, the second adhesive layer 521, and the elastic member 531 are shaped such that the bottom surface 311 side is thicker in the X-axis direction than the container lid 314 side. The first adhesive layer 511 is formed to be thinner than the second adhesive layer 521, and the elastic member 531 is formed to be thinner than the first adhesive layer 511 and the second adhesive layer 521.

Then, as shown in (b) of FIG. 8, as the internal pressure of container 315 of power storage element 301 rises as power storage device 10 is used over time, the side surfaces of container 315 (surfaces on both sides in the X-axis direction) swell. As a result, the first adhesive layer 511 and the second adhesive layer 521 are pressed from both sides in the X-axis direction, and the elastic member 530 has a surface on the plus side in the X-axis direction located laterally (on the plus side in the X-axis direction). It contacts the power storage element 301).

As a result, the first adhesive layer 511 has a smaller thickness in the X-axis direction on the bottom surface 311 side than on the container lid 314 side, but the second adhesive layer 521 and the elastic member 531 do not cover the container lid 314 side. The bottom portion 311 side remains thicker in the X-axis direction than the bottom portion 311 side. In addition, the first adhesive layer 511 remains thinner than the second adhesive layer 521, and the minimum thickness of the elastic member 531 remains thinner than the minimum thickness of the first adhesive layer 511 and the second adhesive layer 521. is there. The maximum thickness of the elastic member 531 may be greater than the minimum thickness of the first adhesive layer 511 depending on the thickness of the container 315.

As described above, according to the power storage device 10 of the present modification, the same effects as those of the above-described embodiment can be obtained. In particular, in this modification, the electricity storage device 301 includes the container 315 manufactured by drawing, but the present invention can be applied to the container 315 as well.

(Modification 2)
Next, a second modification of the above embodiment will be described. 9 and 10 are side views showing the arrangement positions of the first adhesive layer, the second adhesive layer, and the elastic member after the container 310 of the electricity storage device 300 according to the second modification of the present embodiment is swollen. Note that these figures are diagrams corresponding to FIG. 7.

As shown in FIG. 9, in the container 310 of the electricity storage device 300 according to the present modification, an adhesive layer formed intermittently is used instead of the second adhesive layer 520 which is the continuous adhesive layer in the above embodiment. A second adhesive layer 522, 523 and 524 is disposed. The second adhesive layer 522 is a rectangular adhesive layer extending in the Y-axis direction, the second adhesive layer 523 is a triangular adhesive layer, and the second adhesive layer 524 is an L-shaped adhesive layer. .. In addition, the second adhesive layers 523 and 524 are arranged on the protrusion 310e.

Although FIG. 9 shows a mode in which the shape of the second adhesive layer 520 is changed in the above-described embodiment, the first adhesive layer 510 is similarly changed to various shapes such as a triangular shape and an L-shape. It is possible. For example, instead of the first adhesive layer 510 in the above-described embodiment, an adhesive layer having a shape (U-shaped) obtained by extending the adhesive layer from both ends in the Y-axis direction of the first adhesive layer 510 to the minus side in the Z-axis direction may be used. Good. That is, the first adhesive layer and the second adhesive layer may be shaped so as to surround the outer periphery of the side surface of the container 310.

As shown in FIG. 10, the container 310 of the electricity storage device 300 is provided with a first adhesive layer 512, a second adhesive layer 525, and an elastic member 532 formed of a plurality of circular adhesive layers. Further, the first adhesive layer 512 is arranged on the joint portion 310a and the protruding portion 310e, and the second adhesive layer 525 is also arranged on the protruding portion 310e.

As described above, according to the power storage device 10 of the present modification, the same effect as that of the above-described embodiment can be obtained. In particular, as in this modification, various shapes of the first adhesive layer, the second adhesive layer, and the elastic member can be applied. The shapes of the first adhesive layer, the second adhesive layer, and the elastic member are not limited to the above, and may be any shape such as a long shape in the Z-axis direction, a spiral shape, or a honeycomb shape in which a plurality of hexagonal shapes are connected. Although it may have any shape, it is preferably arranged on the joint 310a or the protrusion 310e. Further, the elastic member may be arranged on the protrusion 310f.

(Modification 3)
Next, a modified example 3 of the above embodiment will be described. In the above-mentioned embodiment and its modifications, the first adhesive layer, the second adhesive layer and the elastic member are formed by using the same kind of adhesive. However, some or all of the first adhesive layer, the second adhesive layer, and the elastic member may be formed by using members made of different materials. Alternatively, some or all of the first adhesive layer, the second adhesive layer, and the elastic member may be formed of a member different from the adhesive.

That is, in the above-described embodiment and its modifications, the elastic member has the same elastic modulus as the first adhesive layer and the second adhesive layer, but the elastic member has the elastic modulus of the first adhesive layer and the second adhesive layer. It may be smaller than the elastic modulus of at least one of the two adhesive layers. For example, the elastic member may be formed of an adhesive having a low elastic modulus, a rubber sheet, or the like. The elastic moduli can be compared by measuring the elastic moduli and Young's modulus.

Further, the elastic member preferably has an elastic modulus smaller than that of both the first adhesive layer and the second adhesive layer. That is, the elastic member preferably has an elastic modulus of less than or equal to that of at least one of the first adhesive layer and the second adhesive layer, and less than or equal to that of both the first adhesive layer and the second adhesive layer. Is more preferable. With this configuration, it is possible to prevent the central region of the side surface of the container from being locally pressed by the hard member.

Further, for example, a part or all of the first adhesive layer, the second adhesive layer, and the elastic member are removably adhered to each other, which is referred to as a double-sided tape, Velcro (registered trademark) tape, Velcro (registered trademark) tape, or the like. Alternatively, the surface fastener structure may be formed. Alternatively, part or all of the first adhesive layer, the second adhesive layer, and the elastic member may be a heat-welded layer in which the members are fused to each other. For example, when the outer surface of the container of the electricity storage device is formed of resin, the first adhesive layer and the second adhesive layer may be formed by melting and integrating the outer surface of the container by heat welding. May be. That is, the “adhesion” in the above-described embodiment and its modified examples is a concept including the case where they are adhered by “adhesion” or “welding”. Alternatively, the elastic member may be formed of resin or rubber sheet having no adhesive property.

Although the power storage device 10 according to the embodiment and the modification thereof has been described above, the invention is not limited to the embodiment and the modification thereof. That is, it should be considered that the embodiments and their modifications disclosed this time are exemplifications in all points and not restrictive. The scope of the present invention is shown not by the above description but by the claims, and is intended to include meanings equivalent to the claims and all modifications within the scope.

For example, in the above-described embodiment and its modifications, the lateral side of the power storage element on which the first adhesive layer, the second adhesive layer, and the elastic member (hereinafter, also referred to as the first adhesive layer) are arranged. The arranging portion is assumed to be another electric storage element. However, when the power storage element on which the first adhesive layer or the like is arranged is the power storage element at the end, or when the power storage device 10 includes only one power storage element, the exterior of the power storage element is provided on the side. When the wall portion of the body 11 (the wall portion of the second exterior body 200) is arranged, the lateral arrangement portion may be the wall portion. Alternatively, when the spacer is arranged on the side of the power storage element (that is, the spacer is arranged between two power storage elements), the lateral arrangement portion may be the spacer. Also, when other members are arranged laterally of the power storage element, the other members also serve as the lateral arrangement portions.

Further, in the above-described embodiment and its modification, the joint portion 310a between the container body of the container of the electricity storage device and the container lid 314 is formed on the side surface (the surface on the X-axis direction side and the Y-axis direction side) of the container. I decided to. However, in the case of a configuration in which the container lid 314 is fitted from above the container body, the joint 310a may be formed on the upper surface (the surface on the plus side in the Z-axis direction) of the container. In this case, the first adhesive layer is not disposed on the joint portion 310a, but is disposed in the vicinity of the joint portion 310a. Therefore, the first adhesive layer on the joint portion 310a side is disposed in the same manner as the above embodiment and its modification. It is possible to prevent the first region 310c from swelling and prevent the first region 310c from being damaged.

Further, in the above-described embodiment and its modified example, the joint portion 310a formed in the container of the electricity storage device includes the container body including the bottom surface part 311, the two long side surface parts 312 and the two short side surface parts 313, and the container lid. It is assumed that the portion is joined to the portion 314. However, when the container body is formed by joining, the portion formed by the joining may be the joining portion 310a. That is, for example, when the long side surface portion 312 and the short side surface portion 313 are joined to form the container body or the two portions are joined to form the long side surface portion 312, The joint portion with the short side surface portion 313 or the joint portion with the long side surface portion 312 may be the joint portion 310a.

Moreover, in the said embodiment and its modified example, the elastic member was set apart from the 1st adhesive layer and the 2nd adhesive layer. However, the elastic member may be arranged in contact with either or both of the first adhesive layer and the second adhesive layer.

In addition, in the above-described embodiment and its modification, the elastic member is bonded to either the central region 310b or the lateral arrangement portion. However, the elastic member may not be adhered to either the central region 310b or the lateral arrangement portion.

Further, in the above-described embodiment and its modification, the first adhesive layer has at least one of the area and the width when viewed from the normal direction of the side surface of the container, and the volume, as compared with the second adhesive layer. It was decided to be large. However, the first adhesive layer may be formed smaller than the second adhesive layer in any of the area, width, and volume.

Moreover, in the said embodiment and its modified example, at least 1 side of a 1st adhesive layer and a 2nd adhesive layer shall be arrange|positioned on the protrusion part 310e. However, neither the first adhesive layer nor the second adhesive layer may be disposed on the protrusion 310e.

Further, in the above-described embodiment and its modification, the elastic member is arranged to be thinner than the first adhesive layer and the second adhesive layer in the manufacturing process of power storage device 10. However, the elastic member may be arranged so as to be thicker than the first adhesive layer and the second adhesive layer. According to this, the central region 310b of the container can be firmly pressed by the compressive force of the elastic member.

Further, in the above-described embodiment and its modified example, the first adhesive layer, the second adhesive layer, and the elastic member are arranged in all the power storage elements. However, the first adhesive layer, the second adhesive layer, and a part or all of the elastic member may not be arranged in some of the power storage elements.

Further, in the above-described embodiment and its modification, the first adhesive layer, the second adhesive layer, and the elastic member are arranged on the long side surface of the container of the electricity storage device. However, when the short side surface or other surface of the container swells due to the internal pressure of the container, the first adhesive layer, the second adhesive layer and the elastic member should be arranged on the short side surface or other surface of the container. You can

In addition, in the above-described embodiment and its modification, the electrode body 340 is formed by winding the positive electrode plate, the negative electrode plate, and the separator in the vertical direction (winding on the winding axis parallel to the Y-axis direction in FIG. 3 ). It is assumed that the shape is a vertical winding type. However, the electrode body 340 has a horizontal winding type shape formed by winding the positive electrode plate, the negative electrode plate, and the separator in the horizontal direction (winding on the winding axis parallel to the Z-axis direction). Alternatively, it may have a laminated shape in which flat electrode plates are laminated. Regardless of the shape of the electrode body, since the container swells due to the vaporization and decomposition of the electrolytic solution in the container and the increase in volume in the container, the same effect as in the above-described embodiment can be obtained.

Further, a form constructed by arbitrarily combining the constituent elements included in the above-described embodiment and its modification is also included in the scope of the present invention. For example, the configuration of Modification 1 may be applied to Modification 2.

The present invention can be realized not only as such a power storage device 10 and a manufacturing method thereof, but also as a power storage element, a first adhesive layer, a second adhesive layer, and an elastic member included in the power storage device 10. You can

INDUSTRIAL APPLICABILITY The present invention can be applied to a power storage device including a power storage element such as a lithium ion secondary battery.

10 electricity storage device 300, 301 electricity storage element 310, 315 container 310a joining part 310b central region 310c first region 310d second region 310e, 310f protrusion 312 long side part 340 electrode body 510, 511, 512 first adhesive layer 520, 521 522, 523, 524, 525 Second adhesive layer 530, 531, 532 Elastic member

Claims (9)

A container having a joint formed by joining two parts, and an electricity storage device having an electrode body housed in the container,
The first region and the side placement part are arranged between a first region on the side of the joint part with respect to the central region on the side surface of the container and a side placement part that is placed on the side of the power storage element. A first adhesive layer for bonding and
A second region on the side surface opposite to the first region from the central region, and a second region that is disposed between the side placement unit and bonds the second region and the side placement unit. An adhesive layer,
An elastic member arranged between the central region and the lateral arrangement portion ,
The lateral arrangement portion is a wall portion of an exterior body in which the electricity storage element is housed, another electricity storage element, or a spacer,
The first adhesive layer is larger than the second adhesive layer in at least one of the area and the width when viewed from the normal direction of the side surface, and the volume.
A charge reservoir. A container having a joint formed by joining two parts, and an electricity storage device having an electrode body housed in the container,
The first region and the side placement part are arranged between a first region on the side of the joint part with respect to the central region on the side surface of the container and a side placement part that is placed on the side of the power storage element. A first adhesive layer for bonding and
A second region on the side surface opposite to the first region from the central region, and a second region that is disposed between the side placement unit and bonds the second region and the side placement unit. An adhesive layer,
An elastic member arranged between the central region and the lateral arrangement portion ,
The lateral arrangement portion is a wall portion of an exterior body in which the electricity storage element is housed, another electricity storage element, or a spacer,
The first adhesive layer is arranged between the joint portion and the lateral arrangement portion and adheres the joint portion and the lateral arrangement portion.
A charge reservoir. A container having a joint formed by joining two parts, and an electricity storage device having an electrode body housed in the container,
The first region and the side placement part are arranged between a first region on the side of the joint part with respect to the central region on the side surface of the container and a side placement part that is placed on the side of the power storage element. A first adhesive layer for bonding and
A second region on the side surface opposite to the first region from the central region, and a second region that is disposed between the side placement unit and bonds the second region and the side placement unit. An adhesive layer,
An elastic member arranged between the central region and the lateral arrangement portion ,
The lateral arrangement portion is a wall portion of an exterior body in which the power storage element is housed, another power storage element, or a spacer,
The side surface has a protruding portion that protrudes outward,
At least one of the first adhesive layer and the second adhesive layer is disposed between the protrusion and the lateral arrangement portion, and adheres the protrusion and the lateral arrangement portion.
A charge reservoir. A container having a joint formed by joining two parts, and an electricity storage device having an electrode body housed in the container,
The first region and the side placement part are arranged between a first region on the side of the joint part with respect to the central region on the side surface of the container and a side placement part that is placed on the side of the power storage element. A first adhesive layer for bonding and
A second region on the side surface opposite to the first region from the central region, and a second region that is disposed between the side placement unit and bonds the second region and the side placement unit. An adhesive layer,
An elastic member arranged between the central region and the lateral arrangement portion ,
The lateral arrangement portion is a wall portion of an exterior body in which the power storage element is housed, another power storage element, or a spacer,
The first adhesive layer and the second adhesive layer are both positioned in the positive electrode mixture layer of the positive electrode plate and the negative electrode mixture layer of the negative electrode plate of the electrode body when viewed from the normal direction of the side surface of the container. Is arranged in the first region and the second region including a region outside the region
A charge reservoir. A container having a joint formed by joining two parts, and an electricity storage device having an electrode body housed in the container,
The first region and the side placement part are arranged between a first region on the side of the joint part with respect to the central region on the side surface of the container and a side placement part that is placed on the side of the power storage element. A first adhesive layer for bonding and
A second region on the side surface opposite to the first region from the central region, and a second region that is disposed between the side placement unit and bonds the second region and the side placement unit. An adhesive layer,
An elastic member arranged between the central region and the lateral arrangement portion ,
The lateral arrangement portion is a wall portion of an exterior body in which the electricity storage element is housed, another electricity storage element, or a spacer,
The elastic member has an elastic modulus equal to or lower than the elastic modulus of at least one of the first adhesive layer and the second adhesive layer.
A charge reservoir. A container having a joint formed by joining two parts, and an electricity storage device having an electrode body housed in the container,
The first region and the side placement part are arranged between the first region on the side of the joint part with respect to the central region on the side surface of the container and a side placement part arranged on the side of the power storage element. A first adhesive layer for bonding and
A second region on the side surface that is opposite to the first region with respect to the central region, and a second region that is disposed between the side placement unit and bonds the second region and the side placement unit. An adhesive layer,
An elastic member arranged between the central region and the lateral arrangement portion ,
The lateral arrangement portion is a wall portion of an exterior body in which the power storage element is housed, another power storage element, or a spacer,
The elastic member is arranged apart from at least one of the first adhesive layer and the second adhesive layer.
A charge reservoir. The elastic member, the electric storage device according to any one of claims 1 to 6 which is bonded to one of said central area and said lateral placement unit. The elastic member is in the central region including a region where both the positive electrode mixture layer of the positive electrode plate and the negative electrode mixture layer of the negative electrode plate of the electrode body are located when viewed from the direction normal to the side surface of the container. power storage device according to any one of claims 1 to 7 disposed on. A method of manufacturing a power storage device, comprising a container having a joint formed by joining two parts, and an electric storage element having an electrode body housed in the container,
Between the first region on the side of the joint portion with respect to the central region on the side surface of the container, and between the lateral arrangement portion arranged laterally of the electricity storage device, the first area and the lateral arrangement portion are provided. A first adhesive layer placement step of placing a first adhesive layer to be bonded,
A second adhesive layer that bonds the second region and the side placement part between the second region on the side opposite to the first region and the side placement part with respect to the central region. A second adhesive layer placement step of placing
An elastic member disposing step of disposing an elastic member between the central region and the lateral disposition part ,
The lateral arrangement portion is a wall portion of an exterior body in which the electricity storage element is housed, another electricity storage element, or a spacer,
In the elastic member arranging step, the elastic member is arranged with a thickness smaller than that of the first adhesive layer and the second adhesive layer.
Manufacturing method of a charge reservoir.

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