JP2013073848A - Power storage element and fitting bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage element capable of resisting against high torque applied to a fitting bolt when fitting a conductive member to an electrode terminal.SOLUTION: A power storage element comprises: a housing 120; an electrode terminal 105 fitted to the outer side of the housing 120; a fitting bolt 108 for fitting a conductive member 200 which has electric conductivity to the electrode terminal 105; and an insulation member 109 for insulating the fitting bolt 108 and the housing 120 from each other. The fitting bolt 108 includes: a rod-like screw portion 181 which is threaded on its outer periphery; and a rotation-resistant portion 182 which is a flange-like member radially protruding from one end of the screw portion 181, and which has a first abutting surface part 183 arranged along a surface perpendicular or substantially perpendicular to the rotation direction of a nut 201 screwed to the screw portion 181. The insulation member 109 includes a recessed portion 191 which houses the rotation-resistant portion 182 and has a second abutting surface part 192 brought into contact with the first abutting surface part 183.

Description

  The present invention relates to a power storage element including a primary battery and a secondary battery, and particularly relates to a power storage element including a mounting bolt for mounting a current-carrying member for connecting to another device or another power storage element, and the mounting bolt. .

  2. Description of the Related Art Conventionally, there is an electric storage element including an attachment bolt for attaching an energization member for connecting to another device or another electric storage element to an electrode terminal of the electric storage element. For example, Patent Document 1 describes a secondary battery including a mounting bolt that also functions as an electrode terminal.

  The mounting bolt described in Patent Document 1 is provided with a bar member having a screw cut on the outer periphery in a protruding state from the surface of a rectangular flat plate. An insulating member is disposed between the housing and the mounting bolt to insulate the housing from the mounting bolt, and the insulating member is provided with a recess in which the flat plate of the mounting bolt is accommodated.

  In the secondary battery described in Patent Document 1, the insulating member opposes the torque generated when the nut is tightened to the mounting bolt or when the nut is loosened through the flat plate by using the structure. The nut can be tightened or loosened without rotating the bolt.

JP 2010-212240 A

  In recent years, driving vehicles and traveling vehicles that use electric power as a part of the driving source, such as hybrid vehicles and electric vehicles, have attracted attention, and power storage devices having high energy capacity have been put to practical use as power sources for such traveling vehicles. Has been. When the storage element is arranged in such a traveling vehicle that constantly vibrates, in order to stably maintain the electrical connection state with other devices and other storage elements, the energization member and the electrode terminal of the storage element It is necessary to prevent the connection between the current-carrying member and the electrode terminal from being loosened even if the connection is firmly made and vibration is applied for a long time.

  However, when tightening a nut with a high torque against a mounting bolt of a conventional structure and trying to fasten a current-carrying member and an electrode terminal strongly, a rectangular or regular polygonal metal head is a relatively soft insulating member such as a resin. May bite into. Once the head bites into the insulating member, the tightening torque is concentrated on the corners of the polygonal head, and the insulating member cannot resist the torque and is damaged.

  In such a situation, the nut cannot be tightened with a large torque with respect to the mounting bolt, and when the vibration is applied for a long time, the connection between the energizing member and the electrode terminal is loosened.

  The invention of the present application has been made in view of the above problems, and can provide a mounting bolt and an insulating member that can tighten a nut or the like with a high torque with respect to the mounting bolt and can stably connect the energization member and the electrode terminal. An object of the present invention is to provide an electricity storage device including the above and a mounting bolt.

  In order to achieve the above object, a power storage element according to the present invention includes a power generation element, a housing that houses the power generation element, a mounting bolt that is electrically connected to the power generation element, the mounting bolt, and the housing. An electrical storage element including an insulating member that insulates the body, wherein the mounting bolt includes a rod-shaped screw portion provided with a screw thread on an outer peripheral portion, and a flange-like shape projecting radially from one end portion of the screw portion. An anti-rotation part, the anti-rotation part having a first abutting surface part arranged along a surface orthogonal to or substantially orthogonal to a rotation direction of a nut screwed into the screw part, and the insulation The member includes a recessed portion having a second contact surface portion that contacts the first contact surface portion.

  Accordingly, the first contact surface portion and the second contact surface portion are orthogonal to the rotation direction of the nut, or are in surface contact with a substantially orthogonal surface, so that the nut is rotated and tightened with respect to the screw portion, or It is possible to receive the torque generated at the time of loosening on a surface orthogonal or substantially orthogonal to the torque. Therefore, it can be avoided that the force is concentrated in a narrow range, and even an insulating member having a relatively low rigidity can sufficiently resist the torque.

  As described above, the energizing member and the electrode terminal can be strongly fastened by the mounting bolt, and it is possible to prevent the fastening state between the energizing member and the electrode terminal from being loosened even when subjected to vibration for a long time. Further, even when a high torque is generated when releasing the fastening state between the energizing member and the electrode terminal, the insulating member can sufficiently resist the torque, and the fastening state can be easily released. .

  In addition, the term “storage element” described in the specification and claims refers to an element that can electrochemically store electricity (or generate electricity) and discharge electricity as necessary. More specifically, it is described as including a battery, a storage battery, a capacitor, a large capacity capacitor, a capacitor, an electrolytic capacitor, an electric double layer capacitor, and the like.

  The mounting bolt includes the anti-rotation portion having the first contact surface portion at a plurality of locations, and the insulating member includes the second contact surface portion at a plurality of locations corresponding to the plurality of first contact surface portions. It may be a thing.

  Thereby, the torque generated when the nut is rotated with respect to the screw portion can be received in a dispersed state by the insulating member, and the load on the local portion of the insulating member can be reduced.

  The first contact surface portion may be disposed at a rotationally symmetric position with the axis of the screw portion as a rotation axis.

  According to this, the positional relationship which can insert the anti-rotation part of an attachment bolt into the recessed part of an insulating member can be made into multiple, and it becomes possible to make the assembly operation | work of an electrical storage element easy.

  Moreover, in order to achieve the said objective, the attachment bolt concerning this invention is an attachment bolt which attaches the electroconductive member which has electroconductivity to the electrode terminal of an electrical storage element, Comprising: The rod-shaped screw part by which a thread is provided in an outer peripheral part And a flange-shaped anti-rotation portion that protrudes radially from one end of the screw portion, and is disposed along a surface that is orthogonal or substantially orthogonal to the rotation direction of a nut that is screwed into the screw portion. And an anti-rotation part having a first contact surface part.

  Accordingly, the energizing member and the electrode terminal can be strongly fastened by the mounting bolt, and it is possible to prevent the fastening state between the energizing member and the electrode terminal from being loosened even when subjected to vibration for a long time. Further, even when a high torque is generated when releasing the fastening state between the energizing member and the electrode terminal, the insulating member can sufficiently resist the torque, and the fastening state can be easily released. .

  Further, the power storage device includes a power generation element, a housing that houses the power generation element, a mounting bolt that is electrically connected to the power generation element, and an insulating member that insulates the mounting bolt and the housing. The mounting bolt includes a rod-shaped screw portion provided with a screw thread on an outer peripheral portion, and a plurality of anti-rotation portions projecting radially outward from one end portion of the screw portion, An anti-rotation portion having a first abutting surface portion disposed along a surface intersecting with the rotation direction of the nut screwed into the nut, and a notch recessed inward in the radial direction at a position sandwiched by the anti-rotation portion The insulating member may have a second abutting surface portion that abuts on the first abutting surface portion, and a protruding portion that fits into the front notch portion.

  As a result, the first abutment surface portion of the anti-rotation portion and the second abutment surface portion of the protrusion portion are in surface contact, so that the torque generated when the nut is rotated and tightened or loosened with respect to the screw portion is projected. Can be widely accepted. Therefore, it can be avoided that the force is concentrated in a narrow range, and even an insulating member having a relatively low rigidity can sufficiently resist the torque.

  A nut or the like can be fastened to the mounting bolt with a high torque, and the current-carrying member and the electrode terminal can be strongly fastened. Further, it is possible to easily rotate the nut when loosening the nut strongly tightened to the mounting bolt.

FIG. 1 is a perspective view showing an external appearance of the power storage device of the present embodiment. FIG. 2 is a perspective view schematically showing the inside of the electricity storage device with a part of the container omitted. FIG. 3 is an exploded perspective view schematically showing the vicinity of the current collector in an exploded state. FIG. 4 is an exploded perspective view schematically showing the vicinity of the current collector in a disassembled state with a line of sight opposite to FIG. 3. FIG. 5 is a perspective view showing the mounting bolt and the insulating member. FIG. 6 is a perspective view showing power storage elements connected by a current-carrying member. FIG. 7 is a perspective view showing another example of the mounting bolt and the insulating member. FIG. 8 is a perspective view showing another aspect of the mounting bolt.

  Next, embodiments of a power storage element and mounting bolts according to the present invention will be described with reference to the drawings. In addition, the following embodiment is only what showed the example of the electrical storage element which concerns on this invention, and an attachment bolt. Accordingly, the scope of the present invention is defined by the wording of the claims with reference to the following embodiments, and is not limited to the following embodiments.

  FIG. 1 is a perspective view showing an external appearance of the power storage device of the present embodiment.

  FIG. 2 is a perspective view schematically showing the inside of the electricity storage device with a part of the container omitted.

  FIG. 3 is an exploded perspective view schematically showing the vicinity of the current collector in an exploded state.

  FIG. 4 is an exploded perspective view schematically showing the vicinity of the current collector in a disassembled state with a line of sight opposite to FIG. 3.

  As shown in these drawings, the electricity storage device 100 according to the present embodiment is a non-aqueous electrolyte secondary battery that can charge and discharge electricity, and includes a power generation element 101 and a casing 120. An electrode terminal 105, a mounting bolt 108, and an insulating member 109.

  In the present embodiment, the power generation element 101 is a member that can store electricity, including a separator, a negative electrode, and a positive electrode, although detailed illustration is omitted. The negative electrode is formed by forming a negative electrode active material layer on the surface of a long strip negative electrode current collector foil made of copper, for example. The positive electrode is obtained by forming a positive electrode active material layer on the surface of a long belt-shaped positive electrode current collector foil made of aluminum, for example. The separator is, for example, a microporous sheet made of resin. The power generation element 101 is a so-called flat winding formed by winding a layered arrangement so that a separator is sandwiched between a negative electrode and a positive electrode so that the whole is formed into an oval shape in the length direction. This is a rotary power generation element.

  The housing 120 is a member that houses the power generation element 101. In the case of the present embodiment, the housing 120 includes a container 102 and a lid 103.

  The container 102 is a rectangular (cuboid) member that houses the power generation element 101. The container 102 is made of aluminum or an alloy thereof or a thin stainless steel for reducing the weight. The container 102 includes a rectangular bottom portion, a rectangular long wall portion erected on each long side portion of the bottom portion, and a rectangular short wall portion erected on each short side portion of the bottom portion. Further, the container 102 constitutes the housing 120 together with the lid body by welding the opening end of the container 102 and the lid body 103.

  The lid 103 is a metal plate-like member that closes the opening of the container 102 and includes a first engagement portion 131. In the case of the present embodiment, the first engagement portion 131 is a protruding portion that protrudes toward the power generation element 101 and has a rectangular shape (square). The first engaging portion 131 is a portion formed by pressing a plate-like metal member, and corresponds to a protruding portion opposite to the protruding portion (first engaging portion 131) with respect to the lid 103. The portion is provided with a second recessed portion 132 that is recessed toward the power generation element 101. The second recessed portion 132 is formed at the same time when the protruding portion is formed by press working.

  The electrode terminal 105 is a member that is electrically connected to the power generation element 101 and is attached to the outside of the casing 120, leads the electricity stored in the power generation element 101 to the external space of the casing 120, and generates power A terminal for introducing electricity into the internal space of the housing 120 in order to store electricity in the element 101. The electrode terminal 105 is a member that is disposed on the opposite side of the current collector 104 with respect to the lid 103 and has conductivity. In the case of this embodiment, since the lid 103 is made of metal, an insulating member 109 for insulating the lid 103 and filling the gap with the lid 103 to seal the internal space of the housing is provided. The electrode terminal 105 is attached to the lid 103 through the gap.

  FIG. 5 is a perspective view showing the mounting bolt and the insulating member.

  The mounting bolt 108 is a member for electrically and physically connecting the current-carrying member 200 (see FIGS. 3 and 4), for example, the current-carrying member 200 such as a bus bar or an electric wire, to the electrode terminal 105. Part 182.

  The screw portion 181 is a rod-like member having a thread on the outer peripheral portion.

  The anti-rotation portion 182 is a portion projecting radially from the axis of the screw portion 181 from one end portion of the screw portion 181 in the XY plane, and the rotation direction of the nut 201 screwed into the screw portion 181 (θ in FIG. 5) The first contact surface portion 183 is disposed along a surface that is orthogonal to or substantially orthogonal to (direction).

  In the case of the present embodiment, the anti-rotation part 182 protrudes in the radial direction, and the first contact surface part 183 is disposed on both surfaces of the anti-rotation part 182 orthogonal to the rotation direction. Moreover, the anti-rotation part 182 is equally provided in four places in the circumferential direction. Therefore, the first contact surface portion 183 is disposed at a rotationally symmetric position with the axis of the screw portion 181 (the axis extending in the Z-axis direction and passing through the center of the screw portion 181) as the rotation axis.

  Further, the mounting bolt 108 is provided with a notch 185 that is recessed inward in the radial direction at a position sandwiched between the anti-rotation portions 182. The notch 185 is a portion that is recessed inward in the radial direction from a line that virtually connects the radial tip ends of the adjacent anti-rotation portions 182, and is a portion surrounded by the anti-rotation portion 182. Further, the first contact surface portion 183 may be an angle selected from, for example, the rotation direction and a range from 80 degrees to 100 degrees, preferably from a range from 85 degrees to 95 degrees, and more preferably 89 degrees. Any angle selected from the range of 91 degrees or less may be used.

  The rotation direction of the nut 201 is a tangential direction of the rotation locus of the nut 201. Further, “substantially orthogonal” indicates a state slightly shifted from orthogonal.

  The insulating member 109 is a member that houses the anti-rotation portion 182 and has a second contact surface portion 192 that contacts the first contact surface portion 183. In the case of the present embodiment, the insulating member 109 is a thin plate-like member formed of an insulator such as resin, and has a rectangular protruding fifth engagement that engages with the second recessed portion 132 on one surface side. It is a member which has the part 195 (refer FIG. 4) and has the recessed part 191 in the position corresponding to the 5th engaging part 195 of the other surface side. The recessed portion 191 includes a groove portion 194 corresponding to the anti-rotation portion 182, and the second contact surface portion 192 is disposed on both surfaces of the groove portion 194 orthogonal to the rotation direction (θ direction in the figure). Further, like the anti-rotation portion 182, the groove portions 194 are equally provided at four locations in the circumferential direction. Therefore, the second abutting surface portion 192 is rotationally symmetric with the axis of the mounting bolt 108 (the axis extending in the Z-axis direction and passing through the center of the screw portion 181) as the rotation axis disposed with the anti-rotation portion 182 inserted. It is arranged at the position.

  The insulating member 109 includes a protruding portion 196 that fits with the notch 185. In the case of the present embodiment, the notch 185 has substantially the same shape as the notch 185 surrounded by the anti-rotation part 182.

  The current collector 104 is a member that is electrically connected to the electrode terminal 105 and the power generation element 101 and is also physically (mechanically) connected to the lid 103, and is fitted to the first engagement portion 131. A second engagement portion 142 that engages in the combined state is provided. In the case of the present embodiment, the second engagement portion 142 is a hole that penetrates in the thickness direction and engages with the protruding portion (first engagement portion 131).

  The current collector 104 is a metal plate-like member disposed in a bent state along the short wall portion and the lid body 103 from the lid body 103 to the short wall portion of the container 102. The current collector 104 is fixedly connected to the lid 103 together with the electrode terminal 105 by a fastening member 106, and is fixed to the negative electrode or the positive electrode of the power generation element 101 by welding or the like and electrically connected thereto. ing. Thereby, the power generation element 101 is held by the current collector 104 inside the housing.

  The current collector 104 attached to the negative electrode of the power generation element 101 is made of copper, and the current collector 104 attached to the positive electrode is made of aluminum.

  The fastening member 106 is a conductive member that connects the current collector 104 and the electrode terminal 105 in a state of being inserted through the lid 103. In the case of the present embodiment, the fastening member 106 is a metal rivet, the first mounting hole 143 provided in the current collector 104, the insertion hole 173 provided in the second insulating member 107, and the first provided in the lid 103. In a state of being pierced through the second insertion hole 133, the third insertion hole 193 provided in the insulating member 109, and the second attachment hole 153 provided in the electrode terminal 105, it is plastically deformed (caulked) by a tool that presses while rotating. The current collector 104 and the electrode terminal 105 are physically (mechanically) fixed to the lid 103. In addition, an insulating member 109 is interposed between the fastening member 106 and the lid body 103, and the fastening member 106 electrically connects the current collector 104 and the electrode terminal 105 to the lid body 103. The insulation state is maintained.

  The second insulating member 107 is a thin plate-like member formed of an insulator such as resin, and has a third engaging portion 174 that engages with the first engaging portion 131 on one surface side, and the other surface. It is a member which has the 4th engaging part 175 engaged with the 2nd engaging part 142 in the side. In the case of the present embodiment, the third engagement portion 174 has a recessed shape that is fitted to the first engagement portion 131 (protruding portion). The fourth engagement portion 175 has a protruding shape that is inserted into the second engagement portion 142 (hole).

  With the above configuration, when the energizing member 200 pierced by the mounting bolt 108 is tightened with the nut 201 and the electrode terminal 105 and the energizing member 200 are fastened, the torque generated when the nut 201 is rotated is: The first contact surface portion 183 and the second contact surface portion 192 are received by contact. Therefore, even when the nut 201 is strongly rotated, the insulating member 109 including the second contact surface portion 192 can resist torque without buckling. Therefore, the electrode terminal 105 and the energizing member 200 can be strongly fastened, and the storage element 100 connected by the energizing member 200 as shown in FIG. 6 is disposed in an environment where vibration such as a traveling vehicle is applied over a long period of time. Even in this case, it is possible to maintain the fastening state between the energizing member 200 and the electrode terminal 105.

  In addition, in the case of the present embodiment, since the first contact surface portion 183 and the second contact surface portion 192 that function when the nut 201 is tightened are provided at four locations, the torque can be distributed and received. Therefore, the insulating member 109 can be prevented from buckling even if the nut 201 is tightened more strongly.

  Further, since the recessed portion 191 is disposed in the second recessed portion 132 provided in the lid body 103, the torque received from the first contact surface portion 183 is received by the lid body 103 via the insulating member 109. As a result, the nut 201 can be tightened more strongly.

  Further, the recessed portion 191 is disposed in a state of being accommodated in the second recessed portion 132 formed in a recessed shape in the lid body 103, and the anti-rotation portion 182 of the mounting bolt 108 is inserted into the recessed portion 191, so that the lid The protruding amount of the mounting bolt 108 protruding from the surface of the body 103 can be suppressed. Therefore, it is possible to reduce the space necessary for connecting the electricity storage element 100 and the energization member 200. Therefore, it is possible to provide a compact power storage element 100 that can be arranged even in a small space.

  In addition, this invention is not limited to the said embodiment. For example, another embodiment realized by arbitrarily combining the components described in this specification and excluding some of the components may be used as an embodiment of the present invention. In addition, the present invention includes modifications obtained by making various modifications conceivable by those skilled in the art without departing from the gist of the present invention, that is, the meaning described in the claims. It is.

  For example, the tip of the anti-rotation part 182 is a curved surface, but may be a flat surface. Further, the tip of the anti-rotation part 182 may have a sharp shape. Further, the number of anti-rotation portions 182 is not limited to four, and any number such as three or five can be adopted.

  Further, the first contact surface portion 183 is not necessarily a flat surface, and may be a curved surface as shown in FIG. When the first contact surface portion 183 is a curved surface, the surface orthogonal to or substantially orthogonal to the rotation direction (the θ direction in FIG. 5) of the nut 201 screwed to the screw portion 181 is a curved contact surface.

  Further, as shown in FIG. 8, the mounting bolt 108 may include a rivet portion 187 for fastening that is plastically deformed to the opposite side of the screw portion 181 with respect to the anti-rotation portion 182. The rivet portion 187 is a portion for fastening the current collector 104 to the lid body 103 and has the same function as the fastening member 106. The rivet portion 187 is a portion that is electrically connected to the current collector 104 while being inserted into the lid body 103, and attaches the mounting bolt 108 to the lid body 103 via the insulating member 109. Therefore, the mounting bolt 108 also functions as an electrode terminal.

  The rivet portion 187 is plastically deformed (caulked) by a tool that is pressed while rotating, and physically (mechanically) fixes the current collector 104 and the mounting bolt 108 to the lid 103. When the rivet portion 187 is plastically deformed, torque is generated in the mounting bolt 108. In this case, the generated torque is received by the contact between the first contact surface portion 183 and the second contact surface portion 192. Therefore, the insulating member 109 provided with the second contact surface portion 192 can resist torque without buckling. In addition, after the storage element 100 is completed, when the nut 201 is fastened to the mounting bolt 108 and when the nut 201 is removed, the first contact surface portion 183 and the second contact surface portion 192 are in contact with each other, so that the mounting bolt The rotation of 108 is suppressed. Accordingly, it is possible to suppress a decrease in fastening force at a portion fastened by the rivet portion 187, and it is possible to suppress a decrease in function (such as poor contact) of the power storage element 100.

  The present invention can be used for a power storage element (secondary battery), and can be particularly preferably used for a power storage element installed in an environment where vibration is applied over a long period of time.

DESCRIPTION OF SYMBOLS 100 Power storage element 101 Power generation element 102 Container 103 Cover body 104 Current collector 105 Electrode terminal 106 Fastening member 107 Second insulation member 108 Mounting bolt 109 Insulation member 120 Case 131 First engagement part 132 Second recess part 133 Second insertion Hole 142 Second engagement portion 143 First attachment hole 153 Second attachment hole 173 Insertion hole 174 Third engagement portion 175 Fourth engagement portion 181 Screw portion 182 Anti-rotation portion 183 First contact surface portion 191 Recessed portion 192 First Second contact surface portion 193 Third insertion hole 194 Groove portion 195 Fifth engagement portion 200 Current-carrying member 201 Nut

Claims (7)

A power storage element comprising: a power generation element; a housing that houses the power generation element; a mounting bolt that is electrically connected to the power generation element; and an insulating member that insulates the mounting bolt and the housing;
The mounting bolt is
A rod-like threaded portion provided with a thread on the outer periphery;
A first abutting portion that is disposed along a surface that is orthogonal to or substantially orthogonal to the rotation direction of a nut that is screwed into the screw portion, the anti-rotation portion projecting radially from one end of the screw portion. An anti-rotation part having a surface part,
The insulating member is
A power storage device comprising a second contact surface portion that contacts the first contact surface portion. The mounting bolt includes the anti-rotation portion having the first contact surface portion at a plurality of locations,
The power storage element according to claim 1, wherein the insulating member includes the second contact surface portion at a plurality of locations corresponding to the plurality of first contact surface portions. The power storage element according to claim 2, wherein the first contact surface portion is disposed at a rotationally symmetric position with the axis of the screw portion as a rotation axis. The electric storage element according to claim 1, wherein the mounting bolt includes a fastening rivet portion that is plastically deformed to the opposite side to the screw portion with respect to the anti-rotation portion. A mounting bolt for attaching a conductive member having conductivity to the electrode terminal of the storage element,
A rod-like threaded portion provided with a thread on the outer periphery;
A first abutting portion that is disposed along a surface that is orthogonal to or substantially orthogonal to the rotation direction of a nut that is screwed into the screw portion, the anti-rotation portion projecting radially from one end of the screw portion. A mounting bolt comprising an anti-rotation portion having a surface portion. further,
The mounting bolt according to claim 5, further comprising a fastening rivet portion that is plastically deformed to the opposite side to the screw portion with respect to the anti-rotation portion. A power storage element comprising: a power generation element; a housing that houses the power generation element; a mounting bolt that is electrically connected to the power generation element; and an insulating member that insulates the mounting bolt and the housing;
The mounting bolt is
A rod-like threaded portion provided with a thread on the outer periphery;
A plurality of anti-rotation portions projecting radially outward from one end portion of the screw portion, the first anti-rotation portion being disposed along a plane intersecting a rotation direction of a nut screwed into the screw portion; An anti-rotation part having a contact surface part,
A notch that is recessed inward in the radial direction at a position sandwiched between the anti-rotation parts,
The insulating member is
An energy storage device including a second abutting surface portion that abuts on the first abutting surface portion, and a protrusion that fits into the notch portion.

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