JP2016192361A - Power storage element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage element capable of easily connecting a conductive member and an electrode terminal while using a coupling member.SOLUTION: A power storage element 10 comprises a container 100, a positive electrode terminal 200, and an upper insulation member 125 that is disposed between the positive electrode terminal 200 and the container 100. In the positive electrode terminal 200, a notch 201 is formed from an end face of the positive electrode terminal 200 to a predetermined position. A shank 411 of a coupling member 400 including the shank 411 and a head 412 can be inserted through the notch 201. At least one of the positive electrode terminal 200 and the upper insulation member 125 includes an opening 250 or 260 through which the head 412 of the coupling member 400 can be inserted.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an electric storage element including a container that accommodates an electrode body, an electrode terminal, and an insulating member disposed between the electrode terminal and the container.

  As an approach to global environmental problems, automobiles equipped with a motor as a power source, such as hybrid cars and electric cars, are beginning to spread in place of conventional gasoline cars.

  In addition, power storage devices including a plurality of batteries such as lithium ion secondary batteries are widely used as a power source for supplying electric power to motors provided in these hybrid vehicles and the like.

  In such a power storage device, for example, a plurality of batteries in which adjacent batteries are electrically connected by a bus bar are arranged in a metal exterior body. Patent Document 1 discloses a technique for preventing a short circuit between a bus bar and a metal exterior body in such a power storage device.

JP 2011-216400 A

  When a plurality of power storage elements are arranged to form one power storage device (also referred to as a power storage module), each of the plurality of power storage elements is generally regulated by a member such as a housing of the power storage device. Therefore, it is possible to accurately weld a bus bar for connecting adjacent power storage elements to the electrode terminals (positive terminal or negative terminal, the same applies hereinafter) of each of the plurality of power storage elements.

  However, each of the storage elements at both ends of the plurality of storage elements needs to be connected to, for example, a conductive member (such as a cable having a crimp terminal) extended from an external device. Therefore, the power storage elements at both ends and the external conductive member are fastened by using, for example, screw terminals (terminals having a shaft portion that are male screws) attached to electrode terminals and nuts. Specifically, the screw terminals are attached to the electrode terminals by welding the electrode terminals and the screw terminals of the power storage elements at both ends. That is, in order to connect each of the power storage elements at both ends and the external conductive member, it is necessary to first weld the electrode terminal of the power storage element and the screw terminal, and then connect the screw terminal and the conductive member. Fastening work is performed. This can lead to complication of the work of assembling the power storage device or incorporating the power storage device into a device, for example.

  An object of the present invention is to provide a power storage element that can easily connect a conductive member and an electrode terminal using a fastening member in consideration of the above-described conventional problems.

  To achieve the above object, a power storage device according to one embodiment of the present invention is a power storage device including a container, an electrode terminal, and an insulating member disposed between the electrode terminal and the container, The electrode terminal is a notch formed from the end surface of the electrode terminal to a predetermined position, and is formed with a notch into which the shaft portion of the fastening member having a shaft portion and a head can be inserted, At least one of the electrode terminal and the insulating member has an opening through which the head portion of the fastening member can be inserted.

  According to this configuration, the electrode terminal is provided with a notch formed from the end surface to a predetermined position through which the shaft portion of the fastening member can be inserted, and at least one of the electrode terminal and the insulating member is fastened. An opening through which the head of the member can be inserted is formed. Therefore, the fastening member can be easily attached to the electrode terminal from the end face of the electrode terminal.

  Furthermore, after the fastening member is mounted on the electrode terminal, the conductive member and the electrode terminal are mechanically and electrically connected by fastening the external conductive member and the electrode terminal with the fastening member, and the fastening member And the electrode terminal can be mechanically and electrically connected. That is, the fastening member, the electrode terminal, and the conductive member can be fixed together by a fastening process using the fastening member. Therefore, for example, it is not necessary to perform a process for fixing the fastening member to the electrode terminal separately from the fastening process using the fastening member.

  Thus, according to the electrical storage element which concerns on this aspect, the connection of the electrically-conductive member using a fastening member and an electrode terminal can be performed easily.

  Further, in the energy storage device according to one aspect of the present invention, the fastening member is inserted into the notch and the opening by inserting the shaft portion and the head portion of the fastening member from the end surface. It may be attached to the electrode terminal.

  In other words, in the electricity storage device according to this aspect, for example, the fastening member can be attached to the electrode terminal by inserting it into the notch of the electrode terminal from the end face in a state where the shaft portion of the fastening member is raised. . Further, for example, the external conductive member and the electrode terminal can be fastened with the fastening member while the shaft portion is standing upright.

  The power storage device according to one aspect of the present invention is a regulating unit that regulates rotation of the head by contacting the head, and is provided in at least one of the electrode terminal and the insulating member. It may be provided with a regulated part.

  According to this configuration, for example, when the conductive member is fastened to the electrode terminal by the bolt and nut that are the fastening members, the restricting portion functions as a detent of the bolt, so that the fastening work is efficiently performed. Can do.

  In the energy storage device according to one embodiment of the present invention, a weld surface that is a surface to which the conductive member is welded may be further formed on the electrode terminal.

  According to this configuration, it is easy to connect the conductive member using the fastening member and the electrode terminal, and a plane sufficient for joining such as laser welding is ensured as the welding surface at the electrode terminal. Therefore, for example, in the case where the power storage element and the adjacent power storage element are connected by a conductive member such as a bus bar, the reliability of bonding between the electrode terminal and the bus bar can be improved. In other words, the power storage device of this aspect provides high reliability for the connection regardless of which of the different types of connection methods, fastening and welding, is used when connecting the electrode terminal and the conductive member. Can be obtained.

  ADVANTAGE OF THE INVENTION According to this invention, the electrical storage element which can perform the connection of the electrically-conductive member using a fastening member and an electrode terminal easily can be provided.

It is a perspective view which shows the external appearance of the electrical storage element which concerns on embodiment. It is a perspective view which shows each component with which the container main body of the container of the electrical storage element which concerns on embodiment is isolate | separated, and an electrical storage element is provided. It is a disassembled perspective view of the electrical storage element which concerns on embodiment. It is a 1st perspective view which shows the positive electrode terminal which concerns on embodiment, and its surrounding structure. It is a perspective view which shows the external appearance by the side of the upper insulation member of the positive electrode terminal which concerns on embodiment. It is a 2nd perspective view which shows the positive electrode terminal which concerns on embodiment, and its surrounding structure. It is a perspective view which shows the basic composition of the electrical storage apparatus which concerns on embodiment. It is a 1st perspective view which shows the structure of the positive electrode terminal which concerns on the modification 1 of embodiment, and its periphery. It is a 2nd perspective view which shows the structure of the positive electrode terminal which concerns on the modification 1 of embodiment, and its periphery. It is a perspective view which shows the structure of the positive electrode terminal which concerns on the modification 2 of embodiment, and its periphery. It is a side view which shows the structure of the positive electrode terminal which concerns on the modification 2 of embodiment, and its periphery. It is a perspective view which shows another example of the structure for the rotation prevention of a fastening member.

  Hereinafter, a power storage device according to an embodiment of the present invention will be described with reference to the drawings. Each figure is a schematic diagram and is not necessarily illustrated exactly.

  In addition, all of the embodiments and modifications thereof described below are comprehensive or specific examples. The numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of the constituent elements and the like shown in the following embodiments and modifications are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments and modifications, constituent elements that are not described in the independent claims indicating the highest concept are described as optional constituent elements.

  In the following description and drawings, the winding axis direction of the electrode body of the electricity storage element is defined as the X-axis direction. That is, the X-axis direction can be defined as the direction in which the current collectors or electrode terminals are arranged or the direction in which the short side surface of the container faces. Further, the vertical direction of the power storage element is defined as the Z-axis direction. That is, the Z-axis direction can be defined as the direction in which the legs of the current collector extend or the longitudinal direction of the short side surface of the container. A direction intersecting with the X-axis direction and the Z-axis direction is defined as a Y-axis direction. That is, the Y-axis direction can be defined as the opposing direction of the long side of the container, the short direction of the short side of the container, or the thickness direction of the container.

  FIG. 1 is a perspective view showing an external appearance of a power storage element 10 according to the embodiment. FIG. 2 is a perspective view showing components included in the electricity storage device 10 by separating the container body 111 of the container 100 of the electricity storage device 10 according to the embodiment. FIG. 3 is an exploded perspective view of the energy storage device 10 according to the embodiment. In FIG. 3, the container main body 111 is not shown.

  The power storage element 10 is a power storage element including a container that houses an electrode body, an electrode terminal that is electrically connected to the electrode body, and an insulating member that is disposed between the electrode terminal and the container. Specifically, power storage element 10 according to the present embodiment will be described as follows.

  The power storage element 10 is a secondary battery that can charge electricity and discharge electricity, and more specifically, is a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. In particular, the electric storage element 10 is applied to an electric vehicle (EV), a plug-in hybrid electric vehicle (PHEV), or a hybrid electric vehicle (HEV). In addition, the electrical storage element 10 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.

  As shown in these drawings, the electricity storage device 10 includes a container 100, a positive electrode terminal 200, and a negative electrode terminal 300. The positive terminal 200 is attached to the lid 110 via the upper insulating member 125, and the negative terminal 300 is attached to the lid 110 via the upper insulating member 135. The lower insulating members 120 and 130, the positive electrode current collector 140, the negative electrode current collector 150, and the electrode body 160 are accommodated inside the container 100.

  In addition, a liquid such as an electrolytic solution (non-aqueous electrolytic solution) is sealed inside the container 100 of the electricity storage element 10, but the illustration of the liquid is omitted. In addition, as long as it does not impair the performance of the electrical storage element 10, as the electrolyte solution enclosed with the container 100, there is no restriction | limiting in particular and various things can be selected.

  The container 100 includes a container body 111 having a rectangular cylindrical shape and a bottom, and a lid body 110 that is a plate-like member that closes the opening of the container body 111. In addition, the container 100 can be hermetically sealed by welding the lid body 110 and the container body 111 after the electrode body 160 and the like are accommodated therein. The material of the lid body 110 and the container body 111 is not particularly limited, but is preferably a weldable metal such as stainless steel, aluminum, or aluminum alloy.

  The electrode body 160 is an electrode body formed by stacking electrode plates, and is electrically connected to the positive electrode current collector 140 and the negative electrode current collector 150. In the present embodiment, the electrode body 160 is formed by alternately stacking and winding a positive electrode and a negative electrode, which are two types of electrode plates, and a separator.

  In the positive electrode, a mixture layer containing a positive electrode active material is formed on the surface of an elongated metal foil (positive electrode base material layer) made of aluminum. In the negative electrode, a mixture layer including a negative electrode active material layer is formed on the surface of a long metal foil (negative electrode base material layer) made of copper.

  The positive electrode active material used for the positive electrode active material layer or the negative electrode active material used for the negative electrode active material layer may be a known material as long as it is a positive electrode active material or negative electrode active material capable of occluding and releasing lithium ions. Can be used. Moreover, as a separator, the microporous sheet | seat which consists of resin, for example is employ | adopted.

  More specifically, in the electrode body 160 configured as described above, the positive electrode and the negative electrode are wound with a shift in the winding axis direction via a separator, and the positive electrode and the negative electrode are shifted from each other. An uncoated portion, which is a portion where no active material is coated, is provided at the end portion in the direction of travel.

  Specifically, the positive electrode has a positive electrode side end portion 161 in which an uncoated portion to which a positive electrode active material is not applied is laminated at one end in the winding axis direction. Further, the negative electrode has a negative electrode side end portion 162 in which an uncoated portion not coated with a negative electrode active material is laminated on the other end in the winding axis direction. The positive electrode side end portion 161 is bonded to the positive electrode current collector 140, and the negative electrode side end portion 162 is bonded to the negative electrode current collector 150. Although there is no limitation in particular in these joining methods, for example, ultrasonic welding is adopted. Note that the number of electrode bodies 160 included in the power storage element 10 is not particularly limited, and may be two or more.

  The positive electrode current collector 140 is a member that is disposed on the positive electrode side of the electrode body 160 and has electrical conductivity and rigidity that are electrically connected to the positive electrode terminal 200 and the positive electrode of the electrode body 160. The positive electrode current collector 140 is made of aluminum, an aluminum alloy, or the like, like the positive electrode base material layer of the electrode body 160.

  The positive electrode current collector 140 is formed with a through hole 140a, and the positive electrode current collector 140 and the positive electrode terminal 200 are connected by inserting a connecting portion 210 of the positive electrode terminal 200 described later into the through hole 140a. Is done.

  The negative electrode current collector 150 is a member that is disposed on the negative electrode side of the electrode body 160 and has electrical conductivity and rigidity that are electrically connected to the negative electrode terminal 300 and the negative electrode of the electrode body 160. Note that the negative electrode current collector 150 is formed of copper, a copper alloy, or the like, similarly to the negative electrode base material layer of the electrode body 160.

  The negative electrode current collector 150 has a through-hole 150a, and the negative electrode current collector 150 and the negative electrode terminal 300 are connected to each other by inserting a connecting portion 310 of a negative electrode terminal 300 described later into the through-hole 150a. The

  The upper insulating member 125 is a member that electrically insulates the positive electrode terminal 200 and the lid body 110, and the lower insulating member 120 is a member that electrically insulates the positive electrode current collector 140 and the lid body 110. The upper insulating member 135 is a member that electrically insulates the negative electrode terminal 300 from the lid body 110, and the lower insulating member 130 is a member that electrically insulates the negative electrode current collector 150 and the lid body 110. The upper insulating members 125 and 135 may be referred to as upper packing, for example, and the lower insulating members 120 and 130 may be referred to as lower packing, for example. That is, in the present embodiment, the upper insulating members 125 and 135 and the lower insulating members 120 and 130 also have a function of sealing between the electrode terminal (200 or 300) and the container 100.

  The upper insulating members 125 and 135 and the lower insulating members 120 and 130 are made of an insulating material such as polyphenylene sulfide resin (PPS).

  The positive electrode terminal 200 is an electrode terminal electrically connected to the positive electrode of the electrode body 160, and the negative electrode terminal 300 is an electrode terminal electrically connected to the negative electrode of the electrode body 160. As shown in FIG. 3, the positive terminal 200 is provided with a connecting portion 210 that electrically connects the positive terminal 200 and the positive current collector 140.

  The connection part 210 is a member that is inserted into the through hole 140a of the positive electrode current collector 140 and connected to the positive electrode current collector 140, and is, for example, a rivet. That is, the connection part 210 of the positive electrode terminal 200 is inserted into the through hole 125a of the upper insulating member 125, the through hole 110a of the lid 110, the through hole 120a of the lower insulating member 120, and the through hole 140a of the positive electrode current collector 140. It is squeezed. As a result, the positive electrode terminal 200 is fixed to the lid 110 together with the upper insulating member 125, the lower insulating member 120, and the positive electrode current collector 140.

  Similarly, the negative electrode terminal 300 is provided with a connection portion 310 that electrically connects the negative electrode terminal 300 and the negative electrode current collector 150. The connecting portion 310 of the negative electrode terminal 300 is inserted into the through hole 135a of the upper insulating member 135, the through hole 110b of the lid 110, the through hole 130a of the lower insulating member 130, and the through hole 150a of the negative electrode current collector 150 and caulked. It is done. Thereby, the negative electrode terminal 300 is fixed to the lid 110 together with the upper insulating member 135, the lower insulating member 130, and the negative electrode current collector 150.

  The energy storage device 10 configured as described above is configured so that the positive electrode terminal 200 and the negative electrode terminal 300 are inserted with the fastening member in a predetermined position through the shaft portion of the fastening member having the shaft portion and the head portion. It can be attached. In short, in the electricity storage element 10, a fastening member can be easily attached to the electrode terminals (200, 300). This will be described with reference to FIGS.

  The structure for attaching the fastening member in the electric storage element 10 is common to the positive electrode terminal 200 side and the negative electrode terminal 300 side. Therefore, in the following description, the positive electrode terminal 200 and its surrounding structure will be described, and the description of the negative electrode terminal 300 and its peripheral structure will be omitted.

  FIG. 4 is a first perspective view showing the positive electrode terminal 200 and its peripheral structure according to the embodiment. FIG. 5 is a perspective view showing an external appearance of the positive terminal 200 according to the embodiment on the upper insulating member 125 side. FIG. 6 is a second perspective view showing the positive electrode terminal 200 and its peripheral structure according to the embodiment. Specifically, FIG. 6 illustrates a state in which the positive electrode terminal 200 and the conductive member 500 illustrated in FIG. 4 are fastened by the fastening member 400. 4 and 6 illustrate a cable having a crimp terminal as an example of the external conductive member 500 connected to the positive electrode terminal 200. FIG.

  As shown in FIGS. 4 to 6, the storage element 10 is a positive terminal 200 electrically connected to the electrode body 160, and includes a shaft portion 411 of a fastening member 400 having a shaft portion 411 and a head portion 412. A positive electrode terminal 200 to which the fastening member 400 can be attached is provided in a state of being penetrated at a predetermined position. Specifically, the positive electrode terminal 200 is a notch 201 formed from the end surface 204 of the positive electrode terminal 200 to the predetermined position, and includes a shaft portion 411 of a fastening member 400 having a shaft portion 411 and a head portion 412. A notch 201 into which can be inserted is formed. The width in the direction intersecting the extending direction of the notch 201 (X-axis direction in FIG. 4) and the penetrating direction of the shaft portion 411 (Z-axis direction in FIG. 4) (the width in the Y-axis direction in FIG. 201 ”is equal to or larger than the outer diameter of the shaft portion 411. Further, the width of the notch 201 is smaller than the width of the head 412.

  The power storage element 10 further includes an upper insulating member 125 that is an insulating member disposed between the positive electrode terminal 200 and the container 100. Further, in the electricity storage element 10, the positive electrode terminal 200 has an opening 250 through which the head 412 of the fastening member 400 can be inserted. More specifically, the positive electrode terminal 200 has an opening 250 that is disposed adjacent to the opening in the end surface 204 of the notch 201 and through which the head 412 of the fastening member 400 can be inserted in the extending direction of the notch 201. Is formed. Note that the width of the opening 250 in the direction intersecting the extending direction of the notch 201 and the penetrating direction of the shaft portion 411 (the width in the Y-axis direction in FIG. 4, hereinafter referred to as “lateral width of the opening 250”). It is larger than the width of the head 412. Further, the lateral width of the opening 250 is larger than the lateral width of the notch 201.

  Thus, in the present embodiment, the opening 250 is formed at a position adjacent to the opening of the notch 201 on the end face 204 of the positive electrode terminal 200. More specifically, the positive electrode terminal 200 has a space that can accommodate the head 412 inserted from the opening 250. Note that this space is a space provided continuously with the opening 250 in the positive electrode terminal 200, and can be said to be a part of the opening 250.

  The fastening member 400 according to the present embodiment includes a bolt 410 and a nut 420, and the bolt 410 has the shaft portion 411 and the head portion 412 described above. The head portion 412 is a portion provided at one end of the shaft portion 411 and having a maximum diameter larger than the outer diameter of the shaft portion 411. In the present embodiment, the head portion 412 is viewed in plan (in the axial direction of the fastening member 400 (in FIG. 4 (When viewed from the Z-axis direction)). The shaft portion 411 is a portion that forms a male screw in the fastening member 400, and is screwed with a nut 420 on which a female screw is formed.

  As described above, the power storage device 10 according to the present embodiment has the notch 201 and the opening 250 provided in the positive electrode terminal 200, and thus, the conductive member 500 and the positive electrode terminal using the fastening member 400. 200 can be easily connected.

  Specifically, as shown in FIG. 4, fastening is performed so that the shaft portion 411 is inserted into the notch 201 and the head portion 412 is inserted into the opening 250 from the end surface 204 side of the positive electrode terminal 200. A bolt 410 that is a part of the member 400 is attached to the positive electrode terminal 200. That is, the bolt 410 can be inserted into the notch 201 of the positive electrode terminal 200 with the shaft portion 411 standing. In other words, the fastening member 400 can be attached to the positive electrode terminal 200 by inserting the shaft portion 411 and the head portion 412 of the fastening member 400 from the end face 204 into the notch 201 and the opening 250.

  As a result, the bolt 410 is attached to the positive electrode terminal 200 with the end portion of the shaft portion 411 opposite to the head portion 412 protruding upward from the notch 201 of the positive electrode terminal 200. Furthermore, the conductive member 500 and the positive electrode terminal 200 are fastened by passing the shaft portion 411 through the mounting hole 500a provided in the external conductive member 500 and screwing the shaft portion 411 and the nut 420 together. The

  Accordingly, the external conductive member 500 and the positive electrode terminal 200 can be mechanically and electrically connected, and the fastening member 400 and the positive electrode terminal 200 can be mechanically and electrically connected. That is, the fastening member 400, the positive electrode terminal 200, and the conductive member 500 are fixed together by a fastening process using the fastening member 400. Therefore, for example, it is not necessary to perform a process (for example, welding) for fixing the fastening member 400 to the positive electrode terminal 200 separately from the fastening process of the conductive member 500 and the positive electrode terminal 200 using the fastening member 400.

  Therefore, according to the electrical storage element 10 according to the present embodiment, the conductive member 500 using the fastening member 400 and the electrode terminal (the positive electrode terminal 200 in the above description) can be easily connected.

  Further, in the present embodiment, the notch 201 and the opening 250 are formed in the positive electrode terminal 200, but such a positive electrode terminal 200 can be easily manufactured by, for example, pressing. That is, the positive electrode terminal 200 having the notch 201 does not need to be formed by, for example, partially cutting out the flat plate-like positive electrode terminal 200, and may be formed by the above-described pressing, It may be formed by casting.

  Further, since it is not necessary to form a portion for attaching the fastening member 400 to the upper insulating member 125, for example, an existing packing or the like is employed as the upper insulating member 125 included in the power storage device 10 according to the present embodiment. can do.

  The power storage device 10 according to the present embodiment further has a structure for preventing the bolt 410 from rotating when the nut 420 is tightened.

  Specifically, as illustrated in FIG. 5, the positive electrode terminal 200 includes a regulation unit 220 that regulates the rotation of the head 412 by contacting the head 412. In the present embodiment, the restricting portion 220 is a wall portion surrounding a space in which the head portion 412 of the fastening member 400 (bolt 410) is accommodated, and is lateral to the head portion 412 (perpendicular to the axial direction of the fastening member 400). Formed by at least a part of the wall portion arranged in the direction of That is, the outer shape of the head 412 is not circular in a plan view, but is rectangular in the present embodiment. Therefore, when the nut 420 that is screwed with the shaft portion 411 is turned, the side surface of the head 412 becomes the restricting portion. 220 abuts. This prevents the head portion 412 from rotating about the shaft portion 411 together with the nut 420.

  That is, the restricting portion 220 functions as a detent for the bolt 410 that is a part of the fastening member 400. Thereby, the fastening operation | work of the electrically-conductive member 500 and the positive electrode terminal 200 using the fastening member 400 is performed efficiently. In addition, for example, it is possible to reliably perform fastening with a predetermined fastening torque.

  Note that, for example, a frictional force between the head 412 and the positive electrode terminal 200 even when the restricting portion 220 is not provided or when the restricting portion 220 does not act so as to restrict the rotation of the head 412. Thus, the nut 420 can be tightened. However, the provision of the restricting portion 220 that functions as a rotation stop for the bolt 410 is preferable from the viewpoint of, for example, the efficiency of the fastening operation as described above.

  Further, when the head portion 412 rotates around the shaft portion 411, the restricting portion 220 and the head portion 412 are in a relationship in which the restricting portion 220 contacts the head portion 412 so as to restrict the rotation. I just need it. Therefore, for example, the outer shape of the head 412 in plan view is not limited to a rectangle, but may be a polygon other than a rectangle, for example, a hexagon, or an ellipse or an ellipse.

  Further, the upper insulating member 125 may have a structure in which a wall portion provided so as to surround the positive electrode terminal 200 is provided on the periphery of the flat plate-shaped main body. In this case, for example, an opening through which the head 412 of the fastening member 400 can be inserted in the extending direction of the notch 201 is provided at a position of the wall facing the opening 250 of the positive electrode terminal 200. This prevents the wall portion of the upper insulating member 125 from interfering with the insertion of the head portion 412 into the opening portion 250.

  Here, in addition to the above-described structure for attaching the fastening member 400 for connecting the conductive member 500, the conductive member is welded to the positive electrode terminal 200 according to the present embodiment, as shown in FIG. A welding surface 203 is formed.

  Specifically, in the positive electrode terminal 200, the length of the notch 201 extending from the end surface 204 is, for example, less than half the length of the positive electrode terminal 200 in the X-axis direction, as shown in FIG. The remaining area in the axial direction is treated as the welding surface 203. That is, since the positive electrode terminal 200 according to the present embodiment has a substantially flat upper surface (surface on the Z-axis direction plus side), a conductive member such as a bus bar other than the portion where the notch 201 is provided. It can be used for welding.

  That is, the positive electrode terminal 200 can be retrofitted with the fastening member 400 and has a flat surface as a welding surface 203 sufficient for joining such as laser welding. Therefore, a plurality of power storage elements 10 are arranged, the plurality of power storage elements 10 are connected in series using, for example, one or more bus bars, and an external conductive member 500 is connected to each of the power storage elements 10 at both ends. 400 can be used for connection. This will be described with reference to FIG.

  FIG. 7 is a perspective view showing a basic configuration of power storage device 50 according to the embodiment. The power storage device 50 is a device that can charge electricity from the outside and discharge electricity to the outside. The power storage device 50 is a power storage module used for, for example, a power storage application or a power supply application. The power storage device 50 may include other elements such as an exterior body that houses the plurality of power storage elements 10 and a control board that controls charging / discharging of the plurality of power storage elements 10, but these other elements The illustration about is omitted.

  Power storage device 50 according to the present embodiment includes a plurality of power storage elements 10 arranged side by side and a plurality of bus bars 600. Among the plurality of power storage elements 10, the different polarities of two adjacent power storage elements 10 are connected by a bus bar 600. That is, the positive electrode terminal 200 of one of the two energy storage elements 10 and the negative electrode terminal 300 of the other energy storage element 10 are connected by the bus bar 600, and as a result, the plurality of energy storage elements. 10 are connected in series.

  More specifically, both ends of each bus bar 600 are welded to the positive electrode terminal 200 or the negative electrode terminal 300 by, for example, laser welding, whereby each bus bar 600 is mechanically connected to the positive electrode terminal 200 and the negative electrode terminal 300. And electrically connected.

  Further, among the plurality of power storage elements 10 connected in series as described above, each of the power storage elements 10 at both ends is connected to a conductive member 501 or 502 which is a cable having a crimp terminal, as shown in FIG. ing.

  For example, the conductive member 501 is connected to the positive electrode terminal 200 of the power storage element 10 on the near side in FIG. Also, a conductive member 502 is connected to the negative electrode terminal 300 of the power storage element 10 on the back side in FIG. Thereby, the power storage device 50 can supply power to an external device via the conductive members 501 and 502. The power storage device 50 can be charged with electric power supplied from an external device supplied via the conductive members 501 and 502.

  As described above, power storage device 50 according to the present embodiment includes a plurality of power storage elements 10, and each of the plurality of power storage elements 10 has a structure that can handle different types of connection methods such as fastening and welding. doing.

  Therefore, as shown in FIG. 7, the power storage device 50 includes a plurality of power storage elements 10 connected in series with one or more bus bars, and the power storage elements 10 at both ends connected to an external device ( 501 and 502), and various connection modes.

  For example, it is assumed that a plurality of power storage elements 10 arranged in a row are connected in parallel using two bus bars 600. In this case, for example, the conductive member 501 is connected to the positive electrode terminal 200 of one power storage element 10 other than both ends of the plurality of power storage elements 10 by using the fastening member 400 and fastened to the negative electrode terminal 300 of the power storage element 10. The conductive member 502 may be connected using the member 400. Even in such a connection mode, the power storage device 50 can exchange electric power with external devices via the conductive members 501 and 502.

  In other words, power storage device 50 includes a plurality of power storage elements 10 according to the present embodiment, and thus the degree of freedom of arrangement positions or electrical connection modes of the plurality of power storage elements 10 is high. Further, for example, when removing the conductive member 501 from the foremost power storage element 10 in FIG. 7, the fastening member 400 including the bolt 410 and the nut 420 can be removed from the positive terminal 200. Therefore, for example, the power storage element 10 can be easily reused in another power storage device.

  The power storage element 10 may adopt a structure other than the structure shown in FIGS. 4 to 6 as a structure that facilitates the connection between the conductive member using the fastening member 400 and the electrode terminal. Therefore, various modifications of the attachment structure of the fastening member 400 in the power storage element 10 will be described focusing on differences from the above embodiment.

(Modification 1)
FIG. 8 is a first perspective view showing the structure of the positive electrode terminal 200 and its periphery according to Modification 1 of the embodiment. FIG. 9 is a second perspective view showing the structure of the positive electrode terminal 200 and its surroundings according to Modification 1 of the embodiment.

  8 and 9 includes a positive electrode terminal 200 and an upper insulating member 125 disposed between the positive electrode terminal 200 and the container 100. The positive electrode terminal 200 has a notch 201 formed therein. Yes. In these points, it is common with the electrical storage element 10 which concerns on the said embodiment.

  In the power storage element 10 a according to this modification, an opening 260 through which the head 412 of the fastening member 400 can be inserted in the extending direction of the notch 201 is formed in the upper insulating member 125. That is, in this modification, the opening 260 into which the head 412 is inserted is disposed at a position in the upper insulating member 125 that communicates with the opening of the end surface 204 of the notch 201. More specifically, the opening 260 is the end surface 126 of the upper insulating member 125 and is on the same side as the end surface 204 of the positive electrode terminal 200 where the opening of the notch 201 exists (X-axis direction plus side in FIG. 8). It is formed on the end face 126. Moreover, the opening of the notch 201 in the end surface 204 of the positive electrode terminal 200 and the opening 260 of the upper insulating member 125 are adjacent to each other in the arrangement direction of the positive electrode terminal 200 and the upper insulating member 125 (Z-axis direction in FIG. 8). Communicate.

  In the present embodiment, as shown in FIG. 9, the opening 260 is formed by a part of the groove formed on the upper surface side of the upper insulating member 125. That is, the upper insulating member 125 has a space that can accommodate the head 412 inserted from the opening 260. Note that this space is a space provided continuously with the opening 260 in the upper insulating member 125, and can be said to be a part of the opening 260.

  The above structure is useful when, for example, the positive electrode terminal 200 is relatively thin because it is not necessary to form the opening 250 (see, for example, FIG. 4) into which the head 412 is inserted in the positive electrode terminal 200.

  Moreover, the upper insulating member 125 according to the present modification includes a restricting portion 230 that restricts the rotation of the head 412 by contacting the head 412 as shown in FIG. 9, for example. In the present modification, the restriction portion 230 is a wall portion that surrounds a space in which the head portion 412 of the fastening member 400 (bolt 410) is accommodated, and is at least a part of the wall portion that is disposed on the side of the head portion 412. Is formed by. That is, when the nut 420 that is screwed with the shaft portion 411 is rotated, the side surface of the head portion 412 comes into contact with the restriction portion 230, so that the head portion 412 rotates around the shaft portion 411 together with the nut 420. It is prevented. That is, the restricting portion 230 functions as a detent for the bolt 410 that is a part of the fastening member 400. Thereby, the effect of the fastening operation | work efficiency using the fastening member 400 etc. is acquired like the control part 220 which concerns on the said embodiment.

  In FIG. 9, the upper insulating member 125 has a shape in which a flat body is provided with a groove that allows the head 412 to move, and the side wall of the groove functions as the restricting portion 230. Yes. However, for example, the rib may function as the restricting portion 230 by standing a rib on the flat plate-like main body, which is a rib that contacts the side surface of the head 412.

(Modification 2)
FIG. 10 is a perspective view showing the structure of the positive electrode terminal 200 and its surroundings according to Modification 2 of the embodiment. FIG. 11 is a side view showing the structure of the positive electrode terminal 200 and its surroundings according to Modification 2 of the embodiment. Specifically, FIG. 11 illustrates a part of the power storage element 10b when the power storage element 10b according to the present modification is viewed from the plus side in the X-axis direction.

  10 and 11 includes a positive electrode terminal 200 and an upper insulating member 125 disposed between the positive electrode terminal 200 and the container 100. The positive electrode terminal 200 has a notch 201 formed therein. Yes. In these points, it is common with the electrical storage element 10 which concerns on the said embodiment.

  In the electricity storage device 10 b according to this modification, an opening through which the head 412 of the fastening member 400 can be inserted in the extending direction of the notch 201 is formed in both the positive electrode terminal 200 and the upper insulating member 125. Specifically, the positive electrode terminal 200 is formed with a first opening 250a, the upper insulating member 125 is formed with a second opening 260a, and the first opening 250a and the second opening 260a One opening 270 is formed by the combination.

  That is, the positive electrode terminal 200 and the upper insulating member 125 are disposed adjacent to the opening in the end surface 204 of the notch 201, and the opening 270 through which the head 412 of the fastening member 400 can be inserted in the extending direction of the notch 201. Have Further, in the present modification, both the restricting portion 220 (see FIG. 5) included in the positive electrode terminal 200 and the restricting portion 230 included in the upper insulating member 125 are used as detents for the bolt 410 that is a part of the fastening member 400. Can function.

  The above structure is useful when, for example, the thickness of the head 412 is relatively large because the thickness of the head 412 can be absorbed by the thickness of the positive electrode terminal 200 and the upper insulating member 125. Moreover, since the width | variety of the thickness direction (Z-axis direction) of the positive electrode terminal 200 of the 1st opening part 250a in the positive electrode terminal 200 is comparatively small, it is useful when the positive electrode terminal 200 is comparatively thin, for example. In addition, since a part of the metal positive electrode terminal 200 (the restricting portion 220) is used as a detent for the bolt 410, for example, the detent of the bolt 410 is performed only by the restricting portion 230 of the upper insulating member 125 made of resin. As a result, the certainty of the detent is improved.

(Other)
As described above, the power storage device according to the present invention has been described based on the embodiment and the modifications thereof. However, the present invention is not limited to the embodiment and its modifications. Without departing from the spirit of the present invention, various modifications conceived by those skilled in the art may be applied to the embodiment or its modifications, or a structure constructed by combining a plurality of the above-described constituent elements may be applied to the present invention. It is included in the range.

  For example, the size and shape of the fastening member 400 are not limited to a specific size and shape. The fastening member 400 has a size that cannot be pulled out in the protruding direction (Z-axis direction plus side) of the shaft portion 411 when the shaft portion 411 is inserted into the notch 201 and the head portion 412 is inserted into the opening 250. And any shape. That is, the width of the notch 201 is formed to be smaller than the width of the opening 250, and the size of the fastening member 400 can be used as long as the structure prevents the shaft portion 411 from coming off in the protruding direction. There is no particular limitation on the shape and type. This is the same also about the electrical storage elements 10a and 10b which concern on the said modification 1 and 2.

  Further, the fastening member attached to the positive terminal 200 or the negative terminal 300 may be other than the fastening member 400 constituted by the bolt 410 and the nut 420. For example, a rivet having a head portion and a shaft portion may be employed as a fastening member attached to the positive electrode terminal 200 or the negative electrode terminal 300. Even in this case, for example, the fastening member, the positive electrode terminal 200, and the conductive member 500 (for example, see FIG. 4) are fixed at the same time by a fastening process (caulking process) using a fastening member that is a rivet. The Therefore, for example, the process for fixing the fastening member to the positive electrode terminal 200 does not need to be performed separately from the fastening process (caulking process) between the conductive member 500 and the positive electrode terminal 200 using the fastening member 400.

  Further, for example, the notch 201 extends from the end surface 204 of the positive terminal 200 on the short side surface side (X-axis direction plus side), but the extending direction of the notch 201 is not limited thereto. For example, the notch 201 may be extended from the end surface of the positive electrode terminal 200 on the negative electrode terminal 300 side (X-axis direction negative side). Moreover, the notch 201 may be extended from the end surface of the positive electrode terminal 200 on the long side surface side (Y-axis direction plus side or minus side).

  In either case, the opening for insertion of the head 412 is formed according to the position of the notch 201, so that the conductive member 500 and the positive terminal 200 using the fastening member 400 are connected. It can be done easily. For example, the extending direction or position of the notch 201 may be determined according to the size or shape of the positive electrode terminal 200 or the size or shape of the fastening member 400.

  Further, the conductive member joined to the welding surface 203 of the positive electrode terminal 200 by welding or the like is not limited to the bus bar 600. For example, a cable having a weldable surface 203 and a weldable terminal may be a conductive member joined to the welded surface 203 of the positive electrode terminal 200.

  In addition, the structure for attaching the fastening member 400 in the power storage element 10 is common to the positive electrode terminal 200 side and the negative electrode terminal 300 side, but only one of the positive electrode terminal 200 and the negative electrode terminal 300 is, for example, FIG. 6 may have the attachment structure of the fastening member 400 shown in FIG. In other words, the structure that facilitates the attachment of the fastening member 400 can be employed independently in each of the positive electrode terminal 200 side and the negative electrode terminal 300 side in the power storage element 10. Both need not have the structure.

  Further, for example, the rotation prevention of the fastening member 400 (bolt 410) may be performed by a method other than bringing the restricting portion 220 or 230 into contact with the side surface of the head 412.

  FIG. 12 is a perspective view showing another example of a structure for preventing the fastening member 400 from rotating. The upper insulating member 125 shown in FIG. 12 has an opening 260 through which the head 412a of the fastening member 400 can be inserted in the extending direction of the notch 201, and is formed inward of the opening 260. Ribs 232 are provided.

  The fastening member 400 includes a bolt 410 and a nut 420, and the bolt 410 has a shaft portion 411 and a head 412a having a circular outer shape in plan view.

  Furthermore, a straight head groove 413 is formed in the head 412a. When the head 412a moves inward (in the X-axis direction minus side) from the opening 260, the head groove 413 is ribbed. 232 can be engaged. As a result, the rotation of the head 412 a around the shaft portion 411 is restricted by the rib 232. That is, the rib 232 functions as a detent for the fastening member 400 (bolt 410).

  In the above structure, since the straight head groove 413 provided on the head 412a is used for rotation prevention, for example, an existing minus grooved bolt (male screw) can be adopted as the bolt 410.

  In addition, the structure of the electrode body 160 included in the energy storage device 10 may not be a winding type, and may be a structure in which flat positive electrodes and negative electrodes are alternately stacked with separators interposed therebetween. Further, the electrode body 160 may have a structure in which a long belt-like positive electrode and a negative electrode are folded in a bellows shape with a separator interposed therebetween.

  The present invention is applicable to power storage elements such as lithium ion secondary batteries.

10, 10a, 10b Power storage element 50 Power storage device 100 Container 110 Lid 110a, 110b, 120a, 125a, 130a, 135a, 140a, 150a Through hole 111 Container body 120, 130 Lower insulating member 125, 135 Upper insulating member 126, 204 End surface 140 Positive electrode current collector 150 Negative electrode current collector 160 Electrode body 161 Positive electrode side end portion 162 Negative electrode side end portion 200 Positive electrode terminal 201 Notch 203 Weld surface 210, 310 Connection portion 220, 230 Restriction portion 232 Rib 250, 260, 270 Opening portion 250a First opening portion 260a Second opening portion 300 Negative electrode terminal 400 Fastening member 410 Bolt 411 Shaft portion 412 412a Head portion 413 Head groove 420 Nut 500, 501, 502 Conductive member 500a Mounting hole 600 Bus bar

Claims (4)

A power storage element comprising a container, an electrode terminal, and an insulating member disposed between the electrode terminal and the container,
The electrode terminal is a notch formed from an end surface of the electrode terminal to a predetermined position, and a notch into which the shaft part of a fastening member having a shaft part and a head can be inserted is formed.
At least one of the electrode terminal and the insulating member has an opening through which the head of the fastening member can be inserted. The electrical storage according to claim 1, wherein the fastening member can be attached to the electrode terminal by inserting the shaft portion and the head portion of the fastening member from the end face through the notch and the opening. element. Furthermore, it is a control part which controls rotation of the said head by contact | abutting with the said head, Comprising: The control part provided in at least one of the said electrode terminal and the said insulating member is provided. Power storage element. The electrical storage element according to any one of claims 1 to 3, wherein a welding surface, which is a surface to which the conductive member is welded, is further formed on the electrode terminal.

Images