JP2019175618A - Inspection method of power storage element and power storage element - Google Patents

Abstract

To provide an inspection method of a power storage element capable of suppressing a decrease in inspection accuracy of electrical characteristics.SOLUTION: An inspection method of a power storage element 100 including electrode terminals (positive terminal 120 and negative terminal 130) includes an inspection step of inspecting the electrical characteristics of the power storage element 100 by bringing probes 21 and 22 into contact with the terminal surfaces 121a and 131a of the electrode terminals having a plurality of convex portions 121b and 131b formed in a planar shape.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a storage element inspection method and a storage element.

  2. Description of the Related Art Conventionally, in an electric storage element manufacturing process or the like, a work for inspecting electric characteristics of an electric storage element by bringing a probe into contact with an electrode terminal of the electric storage element has been widely performed. For example, in Patent Document 1, in order to perform an accurate inspection, a rib-like protrusion is formed on a contact surface of a lead storage battery terminal (electrode terminal) of an electrode (probe) for voltage measurement or energization, An inspection method for performing voltage measurement, capacity inspection, and the like is disclosed.

JP 2010-108681 A

  However, in the conventional method for inspecting a power storage element, there is a risk that the inspection accuracy of electrical characteristics may be reduced. For example, in Patent Document 1, in order to suppress contact failure between the probe and the electrode terminal, a rib-like protrusion is formed on the contact surface of the probe with the electrode terminal, and the inspection is performed. However, the inventor of the present application repeatedly performs this inspection using the same probe, so that the material of the electrode terminal adheres to the rib-like protrusions of the probe, thereby causing poor contact between the probe and the electrode terminal. I found that there was a fear. If poor contact between the probe and the electrode terminal occurs, the inspection accuracy of the electrical characteristics of the power storage element is lowered.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a storage element inspection method and a storage element that can suppress a decrease in inspection accuracy of electrical characteristics.

  In order to achieve the above object, a storage element inspection method according to one aspect of the present invention is a storage element inspection method including an electrode terminal, wherein a plurality of protrusions are formed in a planar shape. An inspection step of inspecting the electrical characteristics of the electric storage element by bringing a probe into contact with the terminal surface is included.

  According to this, in the method for inspecting a storage element, as an inspection step, the probe is brought into contact with the terminal surface of the electrode terminal having a plurality of convex portions formed in a planar shape to inspect the electrical characteristics of the storage element. In this way, by using a power storage element in which a plurality of convex portions are formed in a planar shape on the terminal surface of the electrode terminal, the probe is brought into contact with the terminal surface of the electrode terminal, thereby preventing poor contact between the probe and the electrode terminal. Can be suppressed. That is, since the convex portion is provided on the electrode terminal of the power storage element, even when the inspection is repeatedly performed using the same probe, it is possible to maintain a state where the contact between the probe and the electrode terminal can be ensured. Thereby, since it can suppress that a probe and an electrode terminal raise | generate a contact failure and can test | inspect the electrical property of an electrical storage element, it can suppress that the test | inspection precision of an electrical property falls.

  In the inspection step, the electrical characteristics of the power storage element may be inspected by bringing the flat surface of the probe into contact with the terminal surface.

  According to this, in the method for inspecting a storage element, in the inspection step, the flat surface of the probe is brought into contact with the terminal surface of the electrode terminal having a plurality of convex portions formed into a planar shape, thereby inspecting the electrical characteristics of the storage element. To do. Thus, since the contact surface with the electrode terminal of the probe is a flat surface, even when the same probe is repeatedly used, the electrode terminal material is prevented from adhering to the probe, and the probe and electrode The state which can ensure the contact with a terminal can be maintained. Thereby, since it can suppress that a probe and an electrode terminal raise | generate a contact failure and can test | inspect the electrical property of an electrical storage element, it can suppress that the test | inspection precision of an electrical property falls.

  In the inspection step, the electrical characteristics of the power storage element may be inspected by bringing the probe having a higher hardness than the terminal surface into contact with the terminal surface.

  According to this, in the method for inspecting a storage element, in the inspection step, a probe having a hardness higher than that of the terminal surface is brought into contact with the terminal surface of the electrode terminal having a plurality of convex portions formed in a planar shape. Inspect electrical characteristics. As described above, since the probe is harder than the terminal surface of the electrode terminal, by bringing the probe into contact with the terminal surface, the plurality of convex portions on the terminal surface are crushed, and the contact between the probe and the electrode terminal can be ensured. Thereby, since it can suppress that a probe and an electrode terminal raise | generate a contact failure and can test | inspect the electrical property of an electrical storage element, it can suppress that the test | inspection precision of an electrical property falls.

  An electrical storage element including a container and an electrode terminal, wherein the electrode terminal has a terminal surface that is a surface opposite to the container and is joined to another member, and the other of the terminal surface A plurality of convex portions may be arranged in a planar shape in the joint area with the member.

  According to this, in the electricity storage device, the electrode terminal has a terminal surface on the side opposite to the container, and a plurality of convex portions are arranged in a planar shape in a joining region with other members of the terminal surface. ing. Here, when the inspection is performed by bringing the probe into contact with the terminal surface of the electrode terminal, the probe is brought into contact with the bonding region on the terminal surface due to space problems. For this reason, a probe will be made to contact the some convex part formed in the planar shape of the terminal surface, and the poor contact between a probe and an electrode terminal can be suppressed. Moreover, since the terminal surface is the surface opposite to the container of the electrode terminal, when the probe is brought into contact with the terminal surface, the container can serve as a base to stably support the electrode terminal. It is possible to suppress the surface from being bent or tilted. Thereby, since it can suppress that a probe and an electrode terminal raise | generate a contact failure and can test | inspect the electrical property of an electrical storage element, it can suppress that the test | inspection precision of an electrical property falls.

  Each of the plurality of convex portions may have a protruding height of 0.1 mm or more.

  According to this, in the electric storage element, each of the plurality of convex portions arranged on the terminal surface of the electrode terminal has a protruding height of 0.1 mm or more. Thus, when the protruding height of the convex portion is less than 0.1 mm, the convex portion is not easily crushed, but the convex portion has a height of 0.1 mm or more, so that the terminal of the electrode terminal When the inspection is performed with the probe in contact with the surface, the projection can be crushed and the probe and the electrode terminal can be easily contacted. Thereby, since it can suppress that a probe and an electrode terminal raise | generate a contact failure and can test | inspect the electrical property of an electrical storage element, it can suppress that the test | inspection precision of an electrical property falls.

  In addition, each of the plurality of convex portions may have a curved end shape.

  According to this, in the electric storage element, each of the plurality of convex portions arranged on the terminal surface of the electrode terminal has a curved end shape. Thus, when the tip portion of the convex portion has a curved surface shape (not pointed), when the inspection is performed by bringing the probe into contact with the terminal surface of the electrode terminal, the convex portion of the electrode terminal The tip member can be prevented from adhering to the probe. Thereby, since it can suppress that a probe and an electrode terminal raise | generate a contact failure and can test | inspect the electrical property of an electrical storage element, it can suppress that the test | inspection precision of an electrical property falls.

  Further, the electrode terminal has a terminal body having the terminal surface and a shaft portion that penetrates the container of the electricity storage element, and the plurality of convex portions are arranged on the entire surface of the terminal body of the terminal body. You may decide to be.

  According to this, in the electricity storage element, the plurality of convex portions are arranged on the entire surface of the terminal body of the terminal body of the electrode terminal. In this manner, by arranging the convex portion over the entire surface of the terminal, it is not necessary to position the formation position of the convex portion, and therefore the convex portion can be easily formed on the terminal surface. Further, since the probe may be disposed anywhere on the terminal surface, the probe can be easily positioned for inspection. Thereby, since it can suppress that a probe and an electrode terminal raise | generate a contact failure and can test | inspect the electrical property of an electrical storage element, it can suppress that the test | inspection precision of an electrical property falls.

  Note that the present invention can be realized not only as an inspection method and a storage element of such a storage element, but also as an electrode terminal provided in the storage element, a storage device including the storage element and a bus bar, and a storage device It can also be realized as a manufacturing method.

  According to the storage element inspection method of the present invention, it is possible to suppress a decrease in inspection accuracy of electrical characteristics.

It is a perspective view which shows the external appearance of the electrical storage apparatus which concerns on embodiment. It is the perspective view and sectional drawing which show the external appearance of the electrical storage element which concerns on embodiment. It is a disassembled perspective view which decomposes | disassembles the electrical storage element which concerns on embodiment, and shows each component. It is a figure explaining the test | inspection process in the test | inspection method of the electrical storage element among the manufacturing methods of the electrical storage apparatus which concerns on embodiment. It is a figure explaining the joining process of the electrical storage element and bus bar of the manufacturing method of the electrical storage apparatus which concerns on embodiment.

  Hereinafter, a power storage device and a power storage element according to an embodiment of the present invention, and a manufacturing method and an inspection method thereof will be described with reference to the drawings. It should be noted that the embodiments described below show comprehensive or specific examples. The numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of the constituent elements, the manufacturing process (inspection process), the order of the manufacturing process (inspection process), and the like shown in the following embodiments are examples, and the present invention. It is not the purpose of limiting. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept are described as optional constituent elements. Each figure is a schematic diagram, and dimensions and the like are not necessarily shown strictly. Furthermore, in each figure, the same code | symbol is attached | subjected about the same or similar component.

  Further, in the following description and drawings, the arrangement direction of the electrode terminals (that is, the positive electrode terminal and the negative electrode terminal) in one power storage element, and the current collectors (that is, the positive electrode current collector and the negative electrode current collector) in one power storage element ) Or the facing direction of the short side surface of the container of the storage element is defined as the X-axis direction. Further, the direction in which the power storage elements are arranged, the direction in which the long side surfaces of the power storage elements are opposed, the thickness direction of the containers, or the extending direction of the bus bar is defined as the Y-axis direction. Also, the alignment direction of the outer body body and the lid of the power storage device, the alignment direction of the electrode terminals and the bus bar of the storage element, the alignment direction of the container body and the lid of the storage element, the longitudinal direction of the short side of the container of the storage element, Alternatively, the vertical direction is defined as the Z-axis direction. These X-axis direction, Y-axis direction, and Z-axis direction are directions that intersect (orthogonal in this embodiment). Although the case where the Z-axis direction does not become the vertical direction may be considered depending on the usage mode, the Z-axis direction will be described below as the vertical direction for convenience of explanation. 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 opposite side to the X axis direction plus side. The same applies to the Y-axis direction and the Z-axis direction.

(Embodiment)
[1 General Description of Power Storage Device 10]
First, general description of power storage device 10 in the present embodiment will be given. FIG. 1 is a perspective view showing an appearance of power storage device 10 according to the present embodiment. The figure shows the inside of the exterior body 300 through the exterior body 300.

  The 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 (assembled battery) used for power storage applications, power supply applications, and the like. Specifically, the power storage device 10 is, for example, an automobile 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, a construction It is used as a battery for driving a moving body such as a machine or starting an engine.

  As illustrated in FIG. 1, the power storage device 10 includes a plurality (five in the present embodiment) of power storage elements 100 and a plurality (four in the present embodiment) that electrically connect the plurality of power storage elements 100. Bus bar 200 and an exterior body 300 that accommodates the plurality of power storage elements 100, the bus bar 200, and the like. The power storage device 10 monitors a spacer disposed between the power storage elements 100, a restraining member or an end plate that restrains the power storage element 100, a bus bar frame that positions the bus bar 200, and a charge state or a discharge state of the power storage element 100. However, illustration of these is omitted and detailed description is also omitted.

  The power storage element 100 is a secondary battery (unit cell) that can charge and discharge electricity, and more specifically, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. . In the present embodiment, five flat rectangular parallelepiped (rectangular) power storage elements 100 are arranged in series. Note that the number of power storage elements 100 is not limited to five, and may be other plural numbers or one. Further, in this embodiment, the rectangular parallelepiped (rectangular) power storage element 100 is illustrated, but the shape of the power storage element 100 is not limited to the rectangular parallelepiped shape, and may be a cylindrical shape, a long cylindrical shape, or the like. Alternatively, a laminate type power storage element may be used. Moreover, the electrical storage element 100 is not limited to a nonaqueous electrolyte secondary battery, A secondary battery other than a nonaqueous electrolyte secondary battery may be sufficient, and a capacitor may be sufficient as it. In addition, the storage element 100 may be a primary battery that can use stored electricity without being charged by a user, instead of a secondary battery. Further, the power storage element 100 may be a battery using a solid electrolyte. A detailed description of the configuration of the storage element 100 will be described later.

  Bus bar 200 is a member disposed above a plurality of power storage elements 100. Bus bar 200 is a conductive rectangular and flat member, and electrically connects a plurality of power storage elements 100 to each other. Specifically, bus bar 200 electrically connects a positive electrode terminal or a negative electrode terminal of one power storage device 100 and a negative electrode terminal or a positive electrode terminal of another power storage device 100 in adjacent power storage devices 100. Here, the bus bar 200 is formed of a weldable metal member such as aluminum. That is, for example, one end of the bus bar 200 is joined to the positive terminal of one power storage element 100 by welding and the other end is joined to the negative terminal of another power storage element 100 by welding. The positive terminal of 100 and the negative terminal of another power storage element 100 are electrically connected. In this way, the bus bar 200 connects a plurality of power storage elements 100 in series.

  Bus bar 200 may be arranged to connect a plurality of power storage elements 100 in parallel. The material of the bus bar 200 is not limited to aluminum, but may be any metal that can be welded, such as aluminum alloy, copper, copper alloy, and stainless steel. Any member may be used. The shape of the bus bar 200 is not limited to a rectangular shape and a flat plate shape, and may be any shape that can be welded. Bus bar 200 is an example of another member bonded to the terminal surface of the electrode terminal of power storage element 100.

  The exterior body 300 is a substantially rectangular parallelepiped (box type) container (module case) that constitutes the exterior body of the power storage device 10. That is, the exterior body 300 is disposed outside the plurality of power storage elements 100, the bus bar 200, and the like, and the power storage elements 100 and the like are disposed at predetermined positions to protect them from impact and the like. Moreover, the exterior body 300 is made of an insulating material such as a resin, for example, and prevents the power storage element 100 and the like from coming into contact with an external metal member or the like.

  Specifically, the exterior body 300 has a box-shaped main body portion and a lid portion, and a plurality of power storage elements 100, bus bars 200, and the like are accommodated in the exterior body 300. The exterior body 300 is provided with external connection terminals (external connection terminals on the positive electrode side and the negative electrode side) for charging electricity from the outside and discharging electricity to the outside. Description is omitted. The power storage device 10 also includes a bus bar that connects the external connection terminal and an electrode terminal (an electrode terminal that is not connected to the bus bar 200) of the power storage element 100 at the end of the plurality of power storage elements 100. However, this illustration and detailed description are also omitted. The shape and material of the exterior body 300 are not particularly limited.

[2 Description of Configuration of Power Storage Element 100]
Next, the structure of the electrical storage element 100 is demonstrated in detail. 2A and 2B are a perspective view and a cross-sectional view illustrating an external appearance of the energy storage device 100 according to the present embodiment. Specifically, FIG. 2A is a perspective view showing the appearance of the electricity storage device 100. FIG. 2B is an enlarged cross-sectional view showing an enlarged configuration when the positive electrode terminal 120 of the electricity storage device 100 is cut along the IIb-IIb cross section. Further, FIG. 2C is an enlarged cross-sectional view showing an enlarged configuration when the negative electrode terminal 130 of the electricity storage device 100 is cut along the IIc-IIc cross section. FIG. 3 is an exploded perspective view showing each component by disassembling power storage element 100 according to the present embodiment.

  As shown in FIG. 2, the electricity storage device 100 includes a container 110 having a container body 111 and a lid body 112, a positive electrode terminal 120, and a negative electrode terminal 130. As shown in FIG. 3, an electrode body 140, a positive electrode current collector 150, and a negative electrode current collector 160 are accommodated inside the container 110.

  Note that a gasket or the like is disposed between the lid body 112 and the positive electrode terminal 120 and between the lid body 112 and the positive electrode current collector 150 in order to improve insulation and airtightness. The illustration is omitted. The same applies to the negative electrode side. Moreover, although the electrolyte solution (nonaqueous electrolyte) is enclosed inside the container 110, illustration is abbreviate | omitted. Note that there is no particular limitation on the type of the electrolytic solution as long as it does not impair the performance of the power storage element 100, and various types can be selected. In addition to the above components, a spacer disposed on the side of the positive electrode current collector 150 and the negative electrode current collector 160, an insulating film that wraps the electrode body 140, or the like may be disposed.

  The container 110 includes a container body 111 having a rectangular cylindrical shape and a bottom, and a lid body 112 that is a plate-like member that closes the opening of the container body 111. In addition, the container 110 is configured such that after the electrode body 140 and the like are accommodated therein, the container body 111 and the lid body 112 are welded or the like to seal the inside. In addition, the material of the container main body 111 and the lid body 112 is not particularly limited, and for example, a weldable metal such as stainless steel, aluminum, an aluminum alloy, iron, or a plated steel plate can be used, but a resin can also be used. Further, the lid body 112 is provided with a gas discharge valve 113 for releasing the pressure when the pressure in the container 110 rises, and a liquid injection part 114 for injecting the electrolyte into the container 110. It has been.

  The electrode body 140 is a power storage element (power generation element) formed by laminating a positive electrode plate, a negative electrode plate, and a separator. Here, the positive electrode plate included in the electrode body is obtained by forming a positive electrode active material layer on a positive electrode base material layer which is a long current collector foil made of metal such as aluminum or an aluminum alloy. The negative electrode plate is obtained by forming a negative electrode active material layer on a negative electrode base material layer which is a long current collector foil made of a metal such as copper or a copper alloy. Moreover, as a positive electrode active material used for a positive electrode active material layer and a negative electrode active material used for a negative electrode active material layer, if a lithium ion can be occluded / released, a well-known material can be used suitably. In the present embodiment, an elliptical shape is illustrated as a cross-sectional shape of the electrode body 140, but a circular shape, an elliptical shape, or the like may be used. Further, in the present embodiment, the electrode body 140 shows a wound shape formed by winding a positive electrode plate, a negative electrode plate, and a separator, but a laminated shape in which flat electrode plates are laminated. Alternatively, the shape may be a bellows shape (a spelling shape) obtained by folding a long flat plate electrode.

  The positive electrode current collector 150 is a member having conductivity and rigidity that are electrically connected to the positive electrode terminal 120 and the positive electrode plate of the end portion 141 of the electrode body 140. The negative electrode current collector 160 is a member having conductivity and rigidity that are electrically connected to the negative electrode terminal 130 and the negative electrode plate of the end portion 142 of the electrode body 140. Specifically, the positive electrode current collector 150 and the negative electrode current collector 160 are plate-like members that are arranged in a bent state along the lid body 112 from the side wall of the container body 111 and are fixedly connected to the lid body 112. (Joined). As a result, the electrode body 140 is held (supported) in a state of being suspended from the lid body 112 by the positive electrode current collector 150 and the negative electrode current collector 160, and vibration due to vibration or impact is suppressed. The material of the positive electrode current collector 150 is not limited. For example, the positive electrode current collector 150 is formed of a metal such as aluminum or an aluminum alloy, like the positive electrode base material layer of the electrode body 140. The material of the negative electrode current collector 160 is not limited, but is formed of a metal such as copper or a copper alloy, for example, like the negative electrode base material layer of the electrode body 140.

  The positive electrode terminal 120 is an electrode terminal electrically connected to the positive electrode plate of the electrode body 140, and the negative electrode terminal 130 is an electrode terminal electrically connected to the negative electrode plate of the electrode body 140. In other words, the positive electrode terminal 120 and the negative electrode terminal 130 lead the electricity stored in the electrode body 140 to the external space of the power storage element 100, and also store the electricity in the internal space of the power storage element 100 in order to store the electricity in the electrode body 140. It is an electrode terminal made of metal for introducing. The positive electrode terminal 120 and the negative electrode terminal 130 are attached to the lid body 112 disposed above the electrode body 140. Here, the configuration of the positive terminal 120 and the negative terminal 130 will be described in more detail.

[2.1 Description of configuration of positive electrode terminal 120]
First, the configuration of the positive electrode terminal 120 will be described in detail. As shown in FIG. 3, the positive electrode terminal 120 includes a terminal body 121 and a shaft portion 122. The terminal main body 121 is a main body portion of the positive electrode terminal 120, and is a rectangular and flat portion parallel to the XY plane. The shaft portion 122 is a cylindrical portion that extends from the approximate center position of the terminal body 121 to the negative side in the Z-axis direction, and is inserted into the through hole 115 of the lid body 112 and the through hole 151 of the positive electrode current collector 150. Then, the lid body 112 and the positive electrode current collector 150 are penetrated. Then, the positive end 120 is fixed to the lid body 112 together with the positive electrode current collector 150 by caulking the end portion on the negative side in the Z-axis direction of the shaft portion 122.

  Here, the terminal body 121 and the shaft portion 122 are integrally formed. That is, the positive electrode terminal 120 is formed by processing one member and molding the terminal main body 121 and the shaft portion 122. In addition, although the material of the positive electrode terminal 120 (the terminal main body 121 and the axial part 122) is not limited, For example, like the positive electrode base material layer of the electrode body 140, it forms with metals, such as aluminum or aluminum alloy.

  As shown in FIG. 2B, the terminal main body 121 of the positive electrode terminal 120 has a terminal surface 121a which is a surface opposite to the container 110 (Z-axis direction plus side). That is, the terminal main body 121 has a terminal back surface (not shown) that faces the lid 112 and a terminal surface 121a that is the surface opposite to the terminal back surface. In addition, since the axial part 122 is embed | buried inside the container 110, the terminal surface 121a can also be defined as the surface on the opposite side of the site | part embed | buried inside the container 110 among the positive electrode terminals 120. .

  Moreover, the terminal surface 121a is a surface joined to the bus bar 200 as described above, and a plurality of convex portions 121b are arranged in a planar shape in a joining region of the terminal surface 121a with the bus bar 200. Here, the joining area | region with the bus-bar 200 of the terminal surface 121a is an area | region used as the joining object with the bus-bar 200 among the terminal surfaces 121a, and is the whole surface of the terminal surface 121a in this Embodiment. That is, the plurality of convex portions 121 b are disposed on the entire surface of the terminal surface 121 a of the terminal body 121. Specifically, the plurality of convex portions 121b are arranged at substantially equal intervals in the X-axis direction and the Y-axis direction on the terminal surface 121a, and thereby have a shape in which irregularities spread over the entire surface of the terminal surface 121a. It has become. In other words, the terminal surface 121a has irregularities rougher than the other surface of the electricity storage element 100 (for example, the outer surface of the container 110).

  In addition, the above-described bonding region is also a region where a probe 21 (see FIG. 4), which will be described later, contacts when the electrical characteristics of the power storage element 100 are inspected. That is, in the region of the terminal surface 121a where the probe 21 contacts, the plurality of convex portions 121b are arranged in a planar shape.

  It should be noted that the entire bonding region does not need to be bonded to the bus bar 200, and the bonding region may be a part of the surface of the terminal surface 121a instead of the entire surface. Further, the plurality of convex portions 121b may be arranged on a part of the surface of the bonding region instead of the entire surface. In other words, the plurality of convex portions 121b may be arranged on a part of the surface of the terminal surface 121a instead of the entire surface. That is, in the terminal surface 121a, the location where the bonding with the bus bar 200 is actually performed may not match the location where the convex portion 121b is disposed. For example, it is not always necessary to join the bus bar 200 at the place where the convex portion 121b in the joining area is disposed, and it is not always necessary to place the joint with the bus bar 200 in the joining area. The convex part 121b may not be arranged. Similarly, there may be a part where the probe 21 does not contact among the places where the convex part 121b is arranged, and the convex part 121b is arranged in all the areas where the probe 21 contacts in the joining area. It does not have to be.

  Here, each of the plurality of convex portions 121b provided on the terminal surface 121a preferably has a protruding height of 0.05 mm or more, more preferably 0.1 mm or more, and 0.2 mm or more. Is more preferable. Each of the plurality of convex portions 121b preferably has a protruding height of 1 mm or less, more preferably 0.5 mm or less, and even more preferably 0.3 mm or less. This is because if the protruding height of the convex portion 121b is too small or too large, the effect of the convex portion 121b cannot be exhibited sufficiently.

  Each of the plurality of convex portions 121b has a curved shape at the tip portion. That is, the convex portion 121b has a curved outer edge in the cross-sectional shape of the tip portion. Specifically, the convex portion 121b has a shape in which the cross-sectional area becomes smaller as the tip end portion moves toward the plus side in the Z-axis direction. Thus, the terminal surface 121a has a shape like a sword mountain in which a plurality of convex portions 121b having a tapered tip (conical shape) are formed. The shape of the tip portion of the convex portion 121b is preferably a cone shape as described above, but may be a columnar shape, for example.

[2.2 Description of configuration of negative electrode terminal 130]
Next, the configuration of the negative electrode terminal 130 will be described in detail. As shown in FIG. 3, the negative terminal 130 has a terminal main body 131 and a shaft portion 132. The terminal main body 131 is a main body portion of the negative electrode terminal 130 and is a rectangular and flat plate member parallel to the XY plane. The shaft portion 132 is a columnar member extending from the approximate center position of the terminal body 131 to the minus side in the Z-axis direction, and is inserted into the through hole 116 of the lid body 112 and the through hole 161 of the negative electrode current collector 160. Then, the cover body 112 and the negative electrode current collector 160 are penetrated. Then, the negative end 130 is fixed to the lid body 112 together with the negative electrode current collector 160 by crimping the end portion of the shaft portion 132 on the negative side in the Z-axis direction.

  Here, the terminal body 131 and the shaft portion 132 are configured separately. That is, the negative terminal 130 is formed by joining the separate terminal main body 131 and the shaft portion 132 by press-fitting, caulking, or the like. For this reason, from the surface of the negative electrode terminal 130 (Z-axis direction plus side surface, surface 130a described later), the surface of the shaft portion 132 (Z-axis direction plus side surface, shaft surface 132a described later) is exposed. Yes. Although the material of the negative electrode terminal 130 is not limited, for example, the shaft portion 122 is formed of a metal such as copper or a copper alloy like the negative electrode base material layer of the electrode body 140, and the terminal body 131 is made of aluminum or an aluminum alloy. It is made of metal.

  As shown in FIG. 2C, the terminal main body 131 of the negative electrode terminal 130 has a terminal surface 131a that is a surface opposite to the container 110 (Z-axis direction plus side). Further, the shaft part 132 has a shaft part surface 132a which is a surface opposite to the container 110 (Z-axis direction plus side). That is, the negative electrode terminal 130 has a surface 130 a composed of a terminal surface 131 a and a shaft surface 132 a on the positive side in the Z-axis direction, and this surface 130 a corresponds to the terminal surface 121 a of the terminal body 121 of the positive electrode terminal 120. is doing.

  Here, like the terminal surface 121a, the terminal surface 131a is a surface to be joined to the bus bar 200, and a plurality of convex portions 131b are arranged in a planar shape in the joining region of the terminal surface 131a to the bus bar 200. Yes. Similar to the bonding region of the terminal surface 121a on the positive electrode side, this bonding region is a region to be bonded to the bus bar 200 in the terminal surface 131a, and is the entire surface of the terminal surface 131a in the present embodiment. That is, the plurality of convex portions 131 b are disposed on the entire surface of the terminal surface 131 a of the terminal body 131. However, in the negative electrode terminal 130, unlike the positive electrode terminal 120, the shaft surface 132 a is exposed from the terminal surface 131 a, and therefore the bonding region is an annular region (hollow) other than the shaft surface 132 a of the surface 130 a. Area, a portion indicated by dots in FIG. For this reason, the convex part 131b is also formed in the said cyclic | annular area | region other than the axial part surface 132a of the surface 130a. That is, the convex 131b is formed on the entire surface of the terminal surface 131a and is not formed on the shaft surface 132a.

  In addition, the bonding region is a region where a probe 22 (see FIG. 4), which will be described later, contacts when the electrical characteristics of the power storage element 100 are inspected. That is, in the region of the terminal surface 131a where the probe 22 contacts, the plurality of convex portions 131b are arranged in a planar shape. In addition, since the relationship between the joining region, the place where the bus bar 200 is actually joined, the place where the convex portion 131b is disposed, and the place where the probe 22 contacts is the same as that of the positive electrode side described above, details The detailed explanation is omitted. Moreover, since the protrusion height of the convex part 131b and the shape of the front-end | tip part are the same as that of the convex part 121b, detailed description is abbreviate | omitted.

[3 Description of Manufacturing Method of Power Storage Device 10]
Next, a method for manufacturing power storage device 10 will be described in detail. FIG. 4 is a diagram illustrating an inspection process in the method for inspecting power storage element 100 in the method for manufacturing power storage device 10 according to the present embodiment. Specifically, (a) to (c) in FIG. 4 correspond to (a) to (c) in FIG. 2, and the positive electrode terminal of the storage element 100 in (a) to (c) in FIG. 2. The state which has arrange | positioned the probes 21 and 22 to 120 and the negative electrode terminal 130 is shown. FIG. 5 is a diagram for explaining a joining process between the power storage element 100 and the bus bar 200 in the method for manufacturing the power storage device 10 according to the present embodiment. Specifically, FIG. 5 shows a state in which the bus bar 200 is joined to the positive electrode terminal 120 and the negative electrode terminal 130 of the power storage element 100 after the inspection process.

  In the method for manufacturing the power storage device 10, first, the power storage element 100 including the positive electrode terminal 120 and the negative electrode terminal 130 in which the plurality of convex portions 121 b and 131 b are formed in a planar shape is prepared. Specifically, a plurality of convex portions 121b and 131b are formed in a planar shape in a welding region of the terminal surface 121a of the positive electrode terminal 120 and the bus bar 200 on the terminal surface 131a of the negative electrode terminal 130. And the positive electrode terminal 120 and the negative electrode terminal 130 are assembled | attached, and the electrical storage element 100 is produced.

  Next, the electrical characteristics of the storage element 100 are inspected. Here, the inspection of the electrical characteristics of the electricity storage element 100 includes, for example, confirming the capacity of the electricity storage element 100, measuring the voltage and internal resistance of the electricity storage element 100, and the insulation resistance when the electrolyte is not poured. Various inspections related to the storage element 100 such as measurement are included.

  Specifically, as shown in FIG. 4, as an inspection step in the method for inspecting the electricity storage element 100, a probe is brought into contact with the terminal surface of an electrode terminal having a plurality of convex portions formed in a planar shape, whereby the electricity storage element 100. Inspect the electrical characteristics of That is, the probe 21 is brought into contact with the terminal surface 121a of the positive electrode terminal 120 in which the plurality of convex portions 121b are formed in a planar shape, and the terminal surface 131a of the negative electrode terminal 130 in which the plurality of convex portions 131b are formed in a planar shape. The probe 22 is brought into contact with the storage element 100 to inspect the electrical characteristics.

  Here, the probes 21 and 22 are probes for inspecting the electrical characteristics of the electric storage element 100, and in this embodiment, contact surfaces with the terminal surfaces 121a and 131a (tip surfaces, surfaces on the negative side in the Z-axis direction). However, it is formed flat. For this reason, the contact surfaces of the probes 21 and 22 with the terminal surfaces 121a and 131a are referred to as flat surfaces 21a and 22a. That is, in the inspection step, the flat surfaces 21 a and 22 a of the probes 21 and 22 are brought into contact with the terminal surfaces 121 a and 131 a to inspect the electrical characteristics of the energy storage device 100.

  The probes 21 and 22 are formed of a member having a higher hardness than the terminal surfaces 121a and 131a. For example, when the terminal surfaces 121a and 131a are made of aluminum, the probes 21 and 22 are made of a material harder than aluminum. The probes 21 and 22 are made of, for example, steel (tool steel), and more specifically, carbon tool steel (SK material) plated with gold is used. That is, in the inspection step, the electrical characteristics of the electric storage element 100 are inspected by bringing the probes 21 and 22 having higher hardness than the terminal surfaces 121a and 131a into contact with the terminal surfaces 121a and 131a.

  Here, as shown in FIGS. 4A and 4C, in the negative electrode terminal 130, for example, the terminal surface 131a on the minus side in the X-axis direction from the shaft surface 132a is avoided so as to avoid the shaft surface 132a. The probe 22 is brought into contact with. As for the positive electrode terminal 120, the probe 21 may be brought into contact with any position on the terminal surface 121a. However, the probe 21 is brought into contact with the surface on the positive side in the X-axis direction of the terminal surface 121a in correspondence with the position of the negative electrode terminal 130. . At this time, for example, when the terminal surface 121a is slightly deformed or inclined, the probe 21 is pressed against the terminal surface 121a to compress (crush) the convex portion 121b, thereby Contact failure with the probe 21 can be suppressed. The probes 21 and 22 may have a configuration that can be moved flexibly so as to follow the inclination of the terminal surfaces 121a and 131a.

  And after the said test | inspection process, as shown in FIG. 5, the electrical storage element 100 and the bus-bar 200 are joined. Specifically, the bus bar 200 is joined to the joining region of the terminal surface 121 a of the positive electrode terminal 120 and the joining region of the terminal surface 131 a of the negative electrode terminal 130. More specifically, the positive electrode terminal 120, the negative electrode terminal 130, and the bus bar 200 are bonded (laser welding) by irradiating, for example, laser light to a position corresponding to the bonding region of the terminal surfaces 121 a and 131 a of the bus bar 200. The joined portion 400 is formed. The joint portion 400 is a joint portion having a circular arc shape in a top view in which the X-axis direction plus side and minus side portions of the positive electrode terminal 120 and the negative electrode terminal 130 and the bus bar 200 are joined. Note that the position and shape of the joint 400 are not particularly limited.

  Thereby, the positive electrode terminal 120, the negative electrode terminal 130, and the bus bar 200 are joined (welded) at the positions of the convex portions 121b and 131b formed on the terminal surfaces 121a and 131a. At this time, for example, when the terminal surface 121a is slightly deformed or tilted, the bus bar 200 is pressed against the terminal surface 121a to compress (crush) the convex portion 121b. Bonding failure (welding failure) with the bus bar 200 can be suppressed.

  In addition, it is considered that when there is some clearance during welding, the welded portion enters the clearance and the welded portion expands, so that the weld width increases. In addition, since the gas generated by welding is discharged from the clearance, it is considered that this can also increase the welding width. A large welding width is preferable because the welding strength increases. However, if the clearance is too small, the weld width cannot easily enter the clearance, so the weld width cannot be increased. If the clearance is too large, the amount of weld that enters the clearance becomes insufficient. The width becomes smaller. For this reason, the clearance is preferably 0.05 mm or more and 0.25 mm or less, and more preferably 0.1 mm or more and 0.2 mm or less. That is, the protrusions 121b and 131b preferably have a protrusion height of 50 μm or more and 250 μm or less, and more preferably 100 μm or more and 200 μm or less during welding.

  Moreover, in the junction part 400, although the shape of the convex parts 121b and 131b has changed by welding, by confirming that the convex part 121b or 131b is formed in the circumference | surroundings of the junction part 400, etc. It can be inferred that the convex portion 121b or 131b was formed at the position. The joining in the joining region is not limited to laser welding. For example, mechanical joining by resistance welding, ultrasonic joining, adhesion using a conductive adhesive or double-sided tape, welding by thermal welding, caulking, etc. Etc., various joining techniques can be applied.

[4 Explanation of effects]
As described above, according to the method for inspecting storage element 100 according to the embodiment of the present invention, as an inspection process, electrode terminals (positive electrode terminal 120, negative electrode terminal) in which a plurality of convex portions 121b and 131b are formed in a planar shape. 130) are in contact with the terminal surfaces 121a and 131a, and the electrical characteristics of the electricity storage device 100 are inspected. In this way, the probes 21 and 22 are brought into contact with the terminal surfaces 121a and 131a of the electrode terminals by using the power storage device 100 in which the plurality of convex portions 121b and 131b are formed in a planar shape on the terminal surfaces 121a and 131a of the electrode terminals. By doing so, contact failure between the probes 21 and 22 and the electrode terminal can be suppressed. That is, since the convex portions 121b and 131b are provided on the electrode terminals of the energy storage device 100, contact between the probes 21 and 22 and the electrode terminals can be ensured even when repeated inspection is performed using the same probes 21 and 22. Can keep the state. For example, even if the terminal surfaces 121a and 131a of the electrode terminals are inclined, the projections 121b and 131b of the terminal surfaces 121a and 131a are crushed, thereby ensuring contact between the electrode terminals and the probes 21 and 22. Can do. Thereby, since it can suppress that the probes 21 and 22 and an electrode terminal raise | generate a contact failure and can test | inspect the electrical property of the electrical storage element 100, it can suppress that the test | inspection precision of an electrical property falls. .

  Further, in the inspection step, the flat surfaces 21a and 22a of the probes 21 and 22 are brought into contact with the terminal surfaces 121a and 131a of the electrode terminals on which the plurality of convex portions 121b and 131b are formed in a planar shape, so that the storage element 100 Inspect electrical characteristics. As described above, since the contact surfaces of the probes 21 and 22 with the electrode terminals are flat surfaces, the material of the electrode terminals adheres to the probes 21 and 22 even when repeated inspection is performed using the same probes 21 and 22. It is possible to keep the contact between the probes 21 and 22 and the electrode terminals. Thereby, since it can suppress that the probes 21 and 22 and an electrode terminal raise | generate a contact failure and can test | inspect the electrical property of the electrical storage element 100, it can suppress that the test | inspection precision of an electrical property falls. .

  In the inspection step, the probes 21 and 22 having a hardness higher than that of the terminal surfaces 121a and 131a are brought into contact with the terminal surfaces 121a and 131a of the electrode terminals on which the plurality of convex portions 121b and 131b are formed in a planar shape. The electrical characteristics of the storage element 100 are inspected. Thus, since the probes 21 and 22 are harder than the terminal surfaces 121a and 131a of the electrode terminals, by bringing the probes 21 and 22 into contact with the terminal surfaces 121a and 131a, a plurality of convex portions 121b of the terminal surfaces 121a and 131a, 131b is crushed and contact between the probes 21 and 22 and the electrode terminals can be secured. Thereby, since it can suppress that the probes 21 and 22 and an electrode terminal raise | generate a contact failure and can test | inspect the electrical property of the electrical storage element 100, it can suppress that the test | inspection precision of an electrical property falls. .

  Moreover, according to the electrical storage element 100 according to the embodiment of the present invention, the electrode terminals (the positive terminal 120 and the negative terminal 130) have the terminal surfaces 121a and 131a on the side opposite to the container 110, and the terminal surface A plurality of convex portions 121b and 131b are arranged in a planar shape in a joint region with other members (such as the bus bar 200) of 121a and 131a. Here, when the inspection is performed by bringing the probes 21 and 22 into contact with the terminal surfaces 121a and 131a of the electrode terminals, the probes 21 and 22 are brought into contact with the bonding regions on the terminal surfaces 121a and 131a due to space problems. It will be. For this reason, the probes 21 and 22 are brought into contact with the plurality of convex portions 121b and 131b formed in the surface shape of the terminal surfaces 121a and 131a, and poor contact between the probes 21 and 22 and the electrode terminals can be suppressed. . Further, since the terminal surfaces 121a and 131a are surfaces of the electrode terminals opposite to the container 110, when the probes 21 and 22 are brought into contact with the terminal surfaces 121a and 131a, the container 110 becomes a base, and the electrode terminals Can be stably supported, and the terminal surfaces 121a and 131a can be prevented from being bent or inclined. Thereby, since it can suppress that the probes 21 and 22 and an electrode terminal raise | generate a contact failure and can test | inspect the electrical property of the electrical storage element 100, it can suppress that the test | inspection precision of an electrical property falls. .

  Further, when other members (such as the bus bar 200) are joined to the terminal surfaces 121a and 131a of the electrode terminals, the other members are brought into contact with a joining region in which the plurality of convex portions 121b and 131b are arranged in a planar shape. Thereby, the contact failure of an electrode terminal and the said other member can be suppressed. For example, even if the terminal surfaces 121a and 131a of the electrode terminal are inclined, the projections 121b and 131b of the terminal surfaces 121a and 131a are crushed, thereby ensuring contact between the electrode terminal and the other member. Can do. Moreover, since the terminal surfaces 121a and 131a are surfaces opposite to the electrode terminals of the container 110, when the other members are joined to the terminal surfaces 121a and 131a, the container 110 becomes a base, and the electrode terminals Can be stably supported, and the terminal surfaces 121a and 131a can be prevented from being bent or inclined. Thereby, since it can suppress that the electrode terminal and the said other member raise | generate a joining defect, the joining strength of an electrode terminal and the said other member can be improved. In addition, when the electrode terminal and the other member are joined by welding, the electrode terminal and the other member are heated locally at the portions 121b and 131b of the terminal surfaces 121a and 131a. The bonding strength can be further improved.

  Moreover, in the electrical storage element 100, it is preferable that each of the plurality of convex portions 121b and 131b disposed on the terminal surfaces 121a and 131a of the electrode terminals has a protruding height of 0.1 mm or more. As described above, since the convex portions 121b and 131b have a height of 0.1 mm or more, when the probes 21 and 22 are brought into contact with the terminal surfaces 121a and 131a of the electrode terminals, the convex portions 121b and 131b are inspected. As a result, the probes 21 and 22 can be easily brought into contact with the electrode terminals. Thereby, since it can suppress that the probes 21 and 22 and an electrode terminal raise | generate a contact failure and can test | inspect the electrical property of the electrical storage element 100, it can suppress that the test | inspection precision of an electrical property falls. .

  In addition, since the convex portions 121b and 131b of the terminal surfaces 121a and 131a of the electrode terminals have a height of 0.1 mm or more, the convex portions 121b and 131b are crushed and the electrode terminals and other members (such as the bus bar 200) are It can be made easy to touch. Thereby, since it can suppress that the electrode terminal and the said other member raise | generate a joining defect, the joining strength of an electrode terminal and the said other member can be improved.

  Moreover, in the electrical storage element 100, each of the plurality of convex portions 121b and 131b arranged on the terminal surfaces 121a and 131a of the electrode terminals has a curved surface shape. In this way, when the inspection is performed by bringing the probes 21 and 22 into contact with the terminal surfaces 121a and 131a of the electrode terminals, the tip portions of the convex portions 121b and 131b have a curved surface shape (not pointed). Further, it is possible to suppress the members at the tips of the convex portions 121b and 131b of the electrode terminals from adhering to the probes 21 and 22. Thereby, since it can suppress that the probes 21 and 22 and an electrode terminal raise | generate a contact failure and can test | inspect the electrical property of the electrical storage element 100, it can suppress that the test | inspection precision of an electrical property falls. .

  In addition, since the tip portions of the convex portions 121b and 131b of the terminal surfaces 121a and 131a of the electrode terminal have a curved surface shape (not pointed), the contact area between the electrode terminal and another member (such as the bus bar 200). Can be secured to some extent. Thereby, since it can suppress that the electrode terminal and the said other member raise | generate a joining defect, the joining strength of an electrode terminal and the said other member can be improved.

  Moreover, in the electrical storage element 100, several convex part 121b, 131b is arrange | positioned in the whole surface of the terminal surfaces 121a and 131a of the terminal bodies 121 and 131 of an electrode terminal. Thus, by arranging the convex portions 121b and 131b on the entire surface of the terminal surfaces 121a and 131a, it is not necessary to position the formation positions of the convex portions 121b and 131b, so that the convex portions 121b can be easily formed on the terminal surfaces 121a and 131a. 131b can be formed. In addition, since the probes 21 and 22 may be arranged anywhere on the terminal surfaces 121a and 131a, the probes 21 and 22 can be easily positioned for inspection. Thereby, since it can suppress that the probes 21 and 22 and an electrode terminal raise | generate a contact failure and can test | inspect the electrical property of the electrical storage element 100, it can suppress that the test | inspection precision of an electrical property falls. .

  Further, by arranging the convex portions 121b and 131b on the entire surface of the terminal surfaces 121a and 131a, when other members (such as the bus bar 200) are joined to the terminal surfaces 121a and 131a, the other portions to the terminal surfaces 121a and 131a There is no need to increase the positioning accuracy of the member. Thereby, since it can suppress that the electrode terminal and the said other member raise | generate a joining defect, the joining strength of an electrode terminal and the said other member can be improved.

[5 Description of Modification]
The power storage device and the power storage element, the manufacturing method, and the inspection method thereof according to the embodiment of the present invention have been described above, but the present invention is not limited to this embodiment. That is, the embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  For example, in the above embodiment, the probes 21 and 22 have the flat surfaces 21a and 22a as the tip surfaces. However, the probes 21 and 22 may have a distal end surface on which a curved surface shape or irregularities are formed.

  Moreover, in the said embodiment, the probes 21 and 22 were formed with the member whose hardness is higher than the terminal surfaces 121a and 131a. However, the probes 21 and 22 may be formed of a member equivalent to the terminal surfaces 121a and 131a or a member having a slightly lower hardness than the terminal surfaces 121a and 131a. Even in this case, the probes 21 and 22 are brought into contact with the plurality of convex portions 121b and 131b formed in a planar shape on the terminal surfaces 121a and 131a, thereby suppressing the contact failure between the probes 21 and 22 and the electrode terminals. To some extent.

  Moreover, in the said embodiment, the electrical storage element 100 used for a test | inspection process decided to have the terminal surfaces 121a and 131a in the surface on the opposite side to the container 110. FIG. However, the terminal surfaces 121a and 131a of the electricity storage element 100 may be arranged not on the surface opposite to the container 110 but on a surface adjacent to the surface on the opposite side, for example.

  In the above-described embodiment, in the inspection process, the probes 21 and 22 are brought into contact with the convex portions 121b and 131b in the bonding region with the other members of the terminal surfaces 121a and 131a. However, protrusions 121b and 131b may be provided in addition to the bonding regions of the terminal surfaces 121a and 131a, and the probes 21 and 22 may be in contact with the protrusions 121b and 131b.

  In the above embodiment, the other member joined to the terminal surfaces 121 a and 131 a is the bus bar 200. However, the other member may be, for example, a bus bar that connects the electrode terminal of the electricity storage element 100 and the external connection terminal of the electricity storage device 10, or may be a member that is joined to the terminal surfaces 121a and 131a. Any member may be used.

  Moreover, in the said embodiment, the convex parts 121b and 131b were formed in the terminal main bodies 121 and 131 integrally. However, the protrusions 121b and 131b may be configured separately from the terminal bodies 121 and 131 and joined to the terminal bodies 121 and 131.

  Moreover, in the said embodiment, the convex part was not formed in the axial part surface 132a in the negative electrode terminal 130. FIG. However, a convex portion may be formed on the shaft surface 132a.

  Moreover, in the said embodiment, although all the electrical storage elements 100 decided to have said structure, you may decide that any electrical storage element 100 does not have said structure. Further, in the electricity storage device 100, both the positive electrode side and the negative electrode side have the above-described configuration, but only one of the positive electrode side and the negative electrode side has the above-described configuration. Good.

  Moreover, the form constructed | assembled combining the said embodiment and the said modification arbitrarily is also contained in the scope of the present invention.

  In addition, the present invention can be realized not only as such a power storage element 100 but also as electrode terminals (a positive electrode terminal 120 and a negative electrode terminal 130) included in the power storage element 100.

  The present invention can be applied to a method for inspecting a storage element such as a lithium ion secondary battery.

DESCRIPTION OF SYMBOLS 10 Power storage device 21, 22 Probe 21a, 22a Flat surface 100 Power storage element 110 Container 111 Container main body 112 Cover body 113 Gas discharge valve 114 Liquid injection part 115,116,151,161 Through-hole 120 Positive electrode terminal 121,131 Terminal main body 121a, 131a Terminal surface 121b, 131b Convex part 122, 132 Shaft part 130 Negative electrode terminal 130a Surface 132a Shaft part surface 140 Electrode body 141, 142 End part 150 Positive electrode current collector 160 Negative electrode current collector 200 Bus bar 300 Exterior body 400 Joint part

Claims (7)

A method for inspecting a storage element including an electrode terminal,
An inspection method for an electricity storage element, comprising an inspection step of inspecting the electrical characteristics of the electricity storage element by bringing a probe into contact with a terminal surface of the electrode terminal having a plurality of convex portions formed in a planar shape. The method for inspecting an electric storage element according to claim 1, wherein in the inspection step, an electric characteristic of the electric storage element is inspected by bringing a flat surface of the probe into contact with the surface of the terminal. The method for inspecting an electric storage element according to claim 1, wherein in the inspection step, the electrical characteristics of the electric storage element are inspected by bringing the probe having a higher hardness than the terminal surface into contact with the terminal surface. A storage element comprising a container and an electrode terminal,
The electrode terminal is a surface opposite to the container and has a terminal surface joined to another member;
A power storage element, wherein a plurality of convex portions are arranged in a planar shape in a bonding region of the terminal surface with the other member. The electric storage element according to claim 4, wherein each of the plurality of convex portions has a protruding height of 0.1 mm or more. The electric storage element according to claim 4, wherein each of the plurality of convex portions has a curved shape at a tip portion. The electrode terminal has a terminal body having the terminal surface, and a shaft portion that penetrates the container of the storage element,
The power storage device according to any one of claims 4 to 6, wherein the plurality of convex portions are disposed on an entire surface of the terminal surface of the terminal body.

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