JP2006324347A - Storage element connection structure and bus bar including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection structure for a storage element capable of flowing a large current as well as improving workability in connection of a plurality of elements and reducing manufacturing cost.
SOLUTION: The end surfaces facing each other in the axial direction of the inner cylindrical portions 41 and 51 of the male side conduction hook 22 and the female side conduction hook 32 are abutted, and the outer peripheral surface of the outer cylindrical portion 42 of the male side conduction hook 22 and the female The storage elements are connected to each other by bringing the inner circumferential surface of the outer cylindrical portion 52 of the side conduction hook 32 into pressure contact with each other. Thereby, the male side conduction hook 22 and the female side conduction hook 32 can be attached and detached with one touch. A current path is formed between the end surfaces of the inner cylindrical portions 41 and 51 of the male side conduction hook 22 and the female side conduction hook 32 that are in contact with each other, and the outer circumferential surface of the outer cylindrical portion 42 of the male side conduction hook 22 and the female A current path is formed between the inner peripheral surface of the outer cylindrical portion 52 of the terminal portion.
[Selection] FIG.

Description

  The present invention relates to a storage element connection structure for connecting storage elements and a bus bar including the connection structure, and more particularly to improvement of a positive electrode terminal and a negative electrode terminal that can be connected to each other.

  A storage battery such as a single battery such as a nickel metal hydride or lithium battery, or an energy storage element such as an electric double layer capacitor is used as a drive power source in an electric vehicle or a hybrid electric vehicle.

  Conventionally, a plurality of power storage elements have been connected by welding. In this case, since it is difficult to disassemble or reconnect the power storage elements, if one power storage element fails, the power storage elements There has been a problem that all the power storage devices connected to the device become unusable.

  Therefore, as disclosed in Patent Document 1, for example, a bus bar or a conductor for connecting a plurality of power storage elements to each other between a terminal having a male screw portion at one end of the main body and a bolt fastened thereto. It has been proposed to fix with a pinch in between. However, in the technique of Patent Document 1, a large current cannot be passed because the male screw portion is thin. Moreover, since it is the connection by bolt fastening, workability | operativity is bad, and since a screw part is formed in a terminal, manufacturing cost becomes high. Moreover, as disclosed in Patent Documents 2 and 3, a screw type for screwing a male screw portion formed at a terminal at one end of the main body into a female screw portion formed at a terminal at the other end of the main body. A terminal structure has been proposed. However, in the techniques disclosed in Patent Documents 2 and 3, since the screw is screwed into the male screw portion, the connection workability of the power storage element is poor, and the screw portion is formed in the terminal, so that the manufacturing cost increases.

  On the other hand, for example, as disclosed in Patent Documents 4 to 6, a fitting-type terminal for fitting a convex portion formed on a terminal on one end of the main body into a concave portion formed on a terminal on the other end of the main body. There is a structure. In such techniques of Patent Documents 4 to 6, since the terminals can be connected with one touch compared to the techniques of Patent Documents 1 to 3, workability can be improved and manufacturing cost can be reduced. it can. However, the techniques disclosed in Patent Documents 4 to 6 have a problem that the contact area between the terminals cannot be increased and the current path is small, so that a large current cannot flow.

  As described above, in the connection structure of power storage elements disclosed in Patent Documents 1 to 6, it has not been possible to simultaneously realize the improvement of workability, the reduction of manufacturing cost, and the flow of a large current. Such a problem also occurs when a plurality of power storage elements are connected using a bus bar.

JP-A-9-92238 JP-A-8-222201 JP 2000-77057 A Japanese Utility Model Publication No. 6-5111 JP 2000-123819 A Japanese Utility Model Publication No. 7-36436

  Therefore, the present invention can improve the workability in connection of a plurality of elements and reduce the manufacturing cost, as well as the connection structure of a storage element capable of flowing a large current and a bus bar including the same The purpose is to provide.

  The connection structure of the electricity storage device of the present invention is formed on the inner side of the outer cylindrical portion, the male terminal having the outer cylindrical portion, the inner cylindrical portion formed on the inner side of the outer cylindrical portion, and the outer cylindrical portion. A female terminal having an inner cylindrical portion, an end surface facing the axial direction of the inner cylindrical portion of the male terminal and an end surface facing the axial direction of the inner cylindrical portion of the female terminal abutting each other, and the outer cylinder of the male terminal The male terminal and the female terminal are connected to each other when the outer peripheral surface of the portion and the inner peripheral surface of the outer cylindrical portion of the female terminal are in pressure contact with each other.

  In the connection structure of the energy storage device of the present invention, the end surfaces of the male terminal and the female terminal that face the axial direction of the inner cylindrical portion abut each other, and the outer peripheral surface of the outer cylindrical portion of the male terminal and the inner cylindrical portion of the female terminal Since the male terminal and the female terminal are connected by press-contacting the peripheral surfaces with each other, the male terminal and the female terminal can be attached and detached with one touch. Therefore, workability can be improved. Moreover, in the connection state of a male terminal and a female terminal, since the mutual end surfaces which face the axial direction of the inner side cylindrical part of a male terminal and a female terminal are abutted, positioning in an axial direction can be performed. In addition, even if a high load is generated between the outer peripheral surface of the outer cylindrical portion of the male terminal and the inner peripheral surface of the outer cylindrical portion of the female terminal by appropriately designing them, they are pressed against each other. Since the position of the location is maintained, it is possible to prevent the occurrence of play due to the displacement in the direction in which the generated load is canceled, thereby reducing the connection resistance. Furthermore, since a reaction force is generated at the end surfaces of the inner cylindrical portion of the male terminal and female terminal that are abutted against each other, relative rotation between the male terminal and the female terminal can be prevented. In addition, a current path is formed between the end surfaces of the male terminal and the inner cylindrical portion of the female terminal that are in contact with each other, and the outer peripheral surface of the outer cylindrical portion of the male terminal and the inner peripheral surface of the outer cylindrical portion of the female terminal Since a current path is formed between the two terminals, two current paths of an outer cylindrical portion and an inner cylindrical portion are formed on the male terminal and the female terminal. Accordingly, the area through which the current flows can be increased, so that a large current can be passed. Moreover, since it is not necessary to form the screw part for connecting terminals, manufacturing cost can be reduced.

  Here, the outer cylindrical portion of the male terminal and the female terminal can be formed of a plastic deformation member or an elastic member. When the plastic deformation member is used, the outer peripheral surface of the outer cylindrical portion of the male terminal and the inner peripheral surface of the outer cylindrical portion of the female terminal can be caulked together. On the other hand, when the elastic member is used, the outer peripheral surface of the outer cylindrical portion of the male terminal and the inner peripheral surface of the outer cylindrical portion of the female terminal can be elastically pressed with each other. The elastic member is preferable because it is more durable than the plastic deformation member.

  In the above aspect, various configurations can be used to reduce the connection resistance between the male terminal and the female terminal. For example, the outer peripheral surface of the outer cylindrical portion of the male terminal can have a diameter-expanded portion that increases in diameter in the radial direction as the distance from the female terminal side increases. In this case, the enlarged diameter portion of the outer cylindrical portion of the male terminal and the inner peripheral surface of the outer cylindrical portion of the female terminal can be elastically pressed with each other in a state where the male terminal and the female terminal are connected. Further, the inner peripheral surface of the outer cylindrical portion of the female terminal can have a reduced diameter portion that radially decreases in diameter as the distance from the male terminal side increases. In this case, the outer peripheral surface of the outer cylindrical portion of the male terminal and the reduced diameter portion of the outer cylindrical portion of the female terminal can be elastically pressed with each other in a state where the male terminal and the female terminal are connected.

  Various configurations can be used to fix the male terminal and the female terminal to the main body of the power storage element. For example, a screw portion is formed on the inner peripheral surface of the inner cylindrical portion of the male terminal and the female terminal, and a plurality of claws protruding outward in the radial direction are formed on the outer peripheral surface of the outer cylindrical portion of the male terminal and the female terminal. be able to. In this case, the claw can be an engaging portion of a predetermined tool used when the screw portion is fastened. In such an aspect, since the claw portion is used as the engagement portion of the predetermined tool, when the male terminal or the female terminal is fixed to the main body of the power storage element by screwing, the fixing can be easily performed.

  Various methods can be used for forming the male terminal and the female terminal. For example, the inner cylindrical portion and the outer cylindrical portion of the male terminal and the female terminal can be formed by projecting a plate material in the plate thickness direction, and the claw is a remaining region left between the outer cylindrical portions. Can do. In such an aspect, a nail | claw and an outside cylindrical part can be formed efficiently.

  Various configurations can be used for the nail. For example, the number of claws of the male terminal and the female terminal can be made different from each other. In such an aspect, since the number of claws of the male terminal and the female terminal is different from each other, the male terminal and the female terminal can be easily identified.

  Further, the adjacent claws of at least one terminal of the male terminal and the female terminal can be connected by the connecting portion. In such an aspect, the strength of the nail can be improved by the connecting portion. Moreover, when the nail | claw which mutually adjoins one of terminals is connected by a connection part, since the shape of the nail | claw of a male terminal and a female terminal differs, a male terminal and a female terminal can be identified easily.

  The nail of the male terminal and the female terminal can be formed at equal intervals along the circumferential direction, and the number of the nail of the male terminal and the female terminal can be a positive multiple of the number of teeth of a predetermined tool. it can. In such an aspect, a common tool can be used at the time of screw fastening of the male terminal and the female terminal.

  Further, various configurations can be used for the claw to easily perform the above-described screw fastening. For example, the claws of the male terminal and / or the female terminal may have a shape that approaches the mating terminal as it goes radially outward. In such an aspect, when the screw of the male terminal and / or the female terminal is fastened, the allowance of the tool with respect to the claw can be increased.

  Various configurations can be used to easily detect the voltage of a plurality of power storage elements to which the male terminal and the female terminal are connected. For example, a washer having a flange protruding outward in the radial direction can be provided on the side surface formed along the outer peripheral edge of the base having a disk shape. In this case, a washer can be interposed and tightened between at least one of the male terminal and the female terminal and the main body of the power storage element. In such an embodiment, in a plurality of connected power storage elements, voltage detection can be performed by interposing a conductor between the flanges at the upper end portions of the side portions of the washers facing each other.

  Here, the washer can be formed integrally with at least one of the male terminal and the female terminal. As a result, the number of parts of the power storage element can be reduced, so that the time for assembling the power storage element can be shortened and the weight of the power storage element can be reduced.

  The bus bar of the present invention is a bus bar provided with a male terminal and a female terminal provided in the connection structure of the electricity storage device of the present invention, comprising a bus bar plate, the male terminal being fixed to one end of the bus bar plate, The terminal is fixed to the other end of the bus bar plate. In this case, it is preferable to fix the male terminal and the female terminal to the bus bar plate by welding. It is preferable to use a nail as a welding allowance.

  In the bus bar of the present invention, the female terminal of one power storage element can be connected to the male terminal at one end of the bus bar plate, and the female terminal of another power storage element can be connected to the male terminal at the other end of the bus bar plate. Can do. Thereby, the effect similar to the connection structure of the electrical storage element of this invention can be acquired.

  According to the electricity storage device of the present invention, the end surfaces of the male terminal and the female terminal facing the axial direction of the inner cylindrical portion are abutted, and the outer peripheral surface of the outer cylindrical portion of the male terminal and the inner periphery of the outer cylindrical portion of the female terminal Since the male terminal and the female terminal are connected by bringing the surfaces into pressure contact with each other, the male terminal and the female terminal can be attached and detached with one touch. Therefore, workability can be improved. Moreover, in the connection state of a male terminal and a female terminal, since the mutual end surfaces which face the axial direction of the inner side cylindrical part of a male terminal and a female terminal are abutted, positioning in an axial direction can be performed. In addition, even if a high load is generated between the outer peripheral surface of the outer cylindrical portion of the male terminal and the inner peripheral surface of the outer cylindrical portion of the female terminal by appropriately designing them, they are pressed against each other. Since the position of the location is maintained, it is possible to prevent the occurrence of play due to the displacement in the direction in which the generated load is canceled, thereby reducing the connection resistance. Furthermore, since a reaction force is generated at the end surfaces of the inner cylindrical portion of the male terminal and female terminal that are abutted against each other, relative rotation between the male terminal and the female terminal can be prevented. In addition, a current path is formed between the end surfaces of the male terminal and the inner cylindrical portion of the female terminal that are in contact with each other, and the outer peripheral surface of the outer cylindrical portion of the male terminal and the inner peripheral surface of the outer cylindrical portion of the female terminal Since a current path is formed between the two terminals, two current paths of an outer cylindrical portion and an inner cylindrical portion are formed on the male terminal and the female terminal. Accordingly, the area through which the current flows can be increased, so that a large current can be passed. Furthermore, since it is not necessary to form a screw part for connecting the terminals, the manufacturing cost can be reduced.

  According to the bus bar of the present invention, an effect similar to that of the connection structure of the electricity storage device of the present invention can be obtained.

(1) First Embodiment (1-1) Overall Configuration of First Embodiment Hereinafter, a connection structure for a storage element according to a first embodiment of the present invention will be described with reference to the drawings. 1A and 1B show a configuration of a power storage element 1 that is, for example, an electric double layer capacitor. FIG. 1A is a perspective view, and FIG. 2 is a top view of the electricity storage device 1 of FIG. 1, and FIG. 3 is a bottom view of the electricity storage device 1 of FIG. The power storage element 1 is a cube-type capacitor and includes a case 10 (main body) that is a can having a substantially cubic cylindrical shape. An internal element (not shown) is provided inside the case 10. The internal element includes a positive electrode and a negative electrode that are alternately stacked with a separator interposed therebetween. An upper lid 11 and a lower lid 12 are fixed to the upper surface portion and the lower surface portion of the case 10. The upper lid 11 is provided with a male terminal portion 20 shown in FIG. The lower lid 12 is provided with a female terminal portion 30 shown in FIG. The connection structure of the electricity storage device 1 according to the present embodiment includes a male terminal portion 20 and a female terminal portion 30.

(1-2) Configuration of Terminal Unit As shown in FIG. 2, the male terminal unit 20 includes a male-side external terminal 21 that protrudes and is fixed to the hole in the center of the upper lid 11. The end of the male external terminal 21 on the case 10 side is electrically connected to the positive electrode of the internal element housed inside the case 10. A male screw portion is formed on the outer peripheral surface of the male side external terminal 21, and a male side conduction hook 22 (male terminal) is fixed thereto by screw fastening. A male washer 23 is interposed and tightened between the upper lid 20 and the male conduction hook 22.

  As shown in FIG. 3, the female terminal portion 30 includes a female-side external terminal 31 that protrudes and is fixed to the hole in the central portion of the lower lid 12. The end of the female-side external terminal 31 on the case 10 side is electrically connected to the negative electrode of the internal element housed inside the case 10. A male screw portion is formed on the outer peripheral surface of the female-side external terminal 31, and a female-side conduction hook 32 (female terminal) is fixed thereto by screw fastening. A female washer 33 is interposed between the lower lid 12 and the female conductive hook 32 and tightened.

  4A and 4B show the configuration of the male conduction hook 22, wherein FIG. 4A is a side sectional view and FIG. 4B is a top view. (A) is AA arrow direction sectional drawing of (B). The male-side conduction hook 22 includes a base portion 40 having a ring shape, and an inner cylindrical portion 41 having a cylindrical shape is formed on the inner peripheral edge portion of the upper surface of the base portion 40. A female thread portion 41 </ b> A is formed on the inner peripheral surface of the inner cylindrical portion 41. A cylindrical outer cylindrical portion 42 is formed on the outer peripheral edge of the upper surface of the base 40. The outer cylindrical portion 42 is formed with notches 42A at equal intervals in the circumferential direction. At the upper end portion of the outer cylindrical portion 42, a diameter-expanded portion 42B that increases in diameter in the radial direction as it goes downward is formed. The enlarged diameter portion 42B has elasticity. A claw portion 43 is formed on the outer peripheral portion of the base portion 40. The claw portion 43 has four claws 43A that protrude outward in the radial direction and are formed at equal intervals, and a gap 43B that is formed between the claw 43A adjacent to each other. The claw 43A has a shape in which the tips of the claw 44A adjacent to each other are connected by a connecting part 44B. The claw 43A rises upward as it goes outward in the radial direction.

  5A and 5B show a configuration of the female-side conduction hook 32, where FIG. 5A is a side sectional view and FIG. 5B is a top view. (A) is a BB arrow direction sectional view of (B). The female side conduction hook 32 includes a base portion 50 having a ring shape, and an inner cylindrical portion 51 having a cylindrical shape is formed on the inner peripheral edge portion of the upper surface of the base portion 50. A female screw part 51 </ b> A is formed on the inner peripheral surface of the inner cylindrical part 51. A cylindrical outer cylindrical portion 52 is formed on the outer peripheral edge of the upper surface of the base 50. The outer cylindrical portion 52 has notches 52A formed at equal intervals in the circumferential direction. At the upper end portion of the outer cylindrical portion 52, a reduced diameter portion 52B is formed that decreases in the radial direction as it goes downward. The reduced diameter portion 52B has elasticity. A claw portion 53 is formed on the outer peripheral portion of the base portion 50. The claw portion 53 has twelve claws 53A that protrude outward in the radial direction and are formed at equal intervals, and a gap 53B that is formed between the claw 53A adjacent to each other. The claw 53A rises upward as it goes outward in the radial direction.

  The conduction hooks 22 and 32 are made of a plate material. For example, the inner cylindrical portions 41 and 51 and the outer cylindrical portions 42 and 52 are formed by projecting a plate material in the plate thickness direction, and the claws 43A and 53A are remaining regions left between the outer cylindrical portions 42 and 52. Consists of.

  6A and 6B show the configuration of the male washer 23, where FIG. 6A is a side sectional view and FIG. 6B is a top view. The male washer 23 includes a ring-shaped base 60, and a side surface 61 is formed on the upper surface of the outer peripheral edge of the base 60. A flange 61 </ b> A that protrudes outward in the radial direction is formed at the upper end of the outer peripheral edge of the side surface 61. The female washer 33 has the same shape as the male washer 23 and is not shown in the figure, but includes a base portion 70 having a ring shape, and a side surface portion 71 is formed on the upper surface of the outer peripheral edge portion of the base portion 70. ing. A flange portion 71 </ b> A that protrudes outward in the radial direction is formed at the upper end portion of the outer peripheral edge portion of the side surface portion 71.

(1-3) Assembly of terminal part to power storage element In assembly to the upper lid 11 of the male terminal part 20, the male thread part of the outer peripheral surface of the male side external terminal 21 is connected to the inner cylindrical part 41 of the male side conduction hook 22. The male-side conduction hook 22 is fixed to the male-side outer terminal 21 by being screwed into the female screw portion 41A on the inner peripheral surface. In this case, the male washer 23 is interposed between the male side conduction hook 22 and the upper lid 11, and is fixed to the upper lid 11 by being tightened there.

  In the screw fastening, a male side fastening jig 110 as shown in FIG. 7 is used. FIG. 7 is a bottom view of the male side tightening jig 110. The male side tightening jig 110 has four protrusions 112 (teeth) formed at equal intervals along the circumferential direction on the lower surface of the base 111 having a disk shape. The protruding portion 112 is formed at a position corresponding to the gap 43 </ b> B of the claw portion 43 of the male side conduction hook 22. When the male side conduction hook 22 is screwed, after the protrusion 112 of the male tightening jig 110 is positioned in the gap 43B of the claw 43, the protrusion 112 becomes clawed when the male tightening jig 110 is rotated. It hits the claw 43A of the part 43. Here, in the first embodiment, the claw 43A rises upward as it goes outward in the radial direction as shown in FIG. 4, so that the allowance for the claw 43A of the projection 112 is large as shown in FIG. Become. Accordingly, the protrusion 112 can be prevented from being detached from the gap 43 </ b> B of the claw portion 43 when the male conduction hook 22 is screwed.

  On the other hand, when the female terminal portion 30 is assembled to the lower lid 12, the male screw portion on the outer peripheral surface of the female-side external terminal 31 is screwed onto the female screw portion 51 </ b> A on the inner peripheral surface of the inner cylindrical portion 51 of the female-side conduction hook 30. By fitting, the female side conduction hook 32 is fixed to the female side outer terminal 31. In this case, the female side washer 33 is interposed between the female side conduction hook 32 and the lower lid 12 and is fixed to the lower lid 11 by being tightened there.

  In the screw fastening of the female side conduction hook 32 as described above, a female side fastening jig 120 as shown in FIG. 8 is used. The female side fastening jig 120 has twelve protrusions 122 formed at equal intervals along the circumferential direction on the lower surface of the base 121 having a disc shape. The protruding portion 122 is formed at a position corresponding to the gap 53 </ b> B of the claw portion 53 of the female side conduction hook 32. When the female side conduction hook 32 is screwed, the projection 122 of the female side fastening jig 120 is positioned in the gap 53B of the claw part 53 of the female side conduction hook 32, and then the male side fastening jig 120 is rotated. The protrusion 122 hits the claw 53A of the claw portion 53. Here, in the first embodiment, as shown in FIG. 5, the claw 53 </ b> A rises upward as it goes outward in the radial direction, so that the engagement cost of the protrusion 122 with respect to the claw 53 </ b> A increases. Thereby, at the time of screw fastening of female side conduction hook 32, detachment of projection part 122 from crevice 53B gap 53B can be prevented.

  Here, if the number of claws 43A, 53A of the male side conduction hook 22 and the female side conduction hook 32 is a positive multiple of the number of protrusions of the tightening jig, the male side conduction hook 22 and the female side conduction hook 32 are On the other hand, a common fastening jig 130 as shown in FIG. 9 can be used. The tightening jig 130 has four protrusions 132 formed at equal intervals along the circumferential direction on the lower surface of the base 131 having a disc shape. The protrusion 132 has substantially the same shape as the protrusion 122.

(1-3) Connection Work of Storage Elements Next, connection work of a plurality of storage elements 1 will be described mainly with reference to FIG. The outer cylindrical portion 42 of the male side conduction hook 22 is made to face the male terminal portion 20 of the power storage element 1 shown in FIG. 11A and the female terminal portion 30 of the other power storage element 1 shown in FIG. It is inserted inside the outer cylindrical portion 52 of the female side conduction hook 32. Then, as shown in FIG. 11C, the mutually opposing end surfaces in the axial direction of the inner cylindrical portion 41 of the male side conduction hook 22 and the inner cylindrical portion 51 of the female side conduction hook 32 are abutted. At this time, since the outer peripheral surface of the outer cylindrical portion 42 of the male side conduction hook 22 is pressed against the inner peripheral surface of the outer cylindrical portion 52 of the female side conduction hook 32, a frictional force is generated. The conduction hooks 32 are fixed to each other. In this case, the enlarged diameter portion 42B formed at the distal end portion of the outer cylindrical portion 42 of the male side conduction hook 22 and the reduced diameter portion 52B formed at the distal end portion of the outer cylindrical portion 52 of the female side conduction hook 32 are mutually connected. Since it presses elastically, fixation of male side conduction hook 22 and female side conduction hook 32 becomes firm. On the other hand, the male side conduction hook 22 and the female side conduction hook 32 are positioned in the axial direction by abutting the end surfaces of the inner cylindrical part 41 and the inner cylindrical part 51 facing each other as described above. In addition, a reaction force is generated between the abutting surfaces, and the male conduction hook 22 and the female conduction hook 32 are prevented from rotating relative to each other in the circumferential direction. The fixing of the hook 32 is further strengthened.

(1-4) Voltage Detection of Storage Element Next, voltage detection of the storage element 1 connected as described above will be described with reference to FIG. In the conventional voltage detection of the electric storage element, a screw other than the conduction hooks 22 and 32 is screwed to the inner periphery of the external terminals 21 and 31. On the other hand, in the voltage detection of the electricity storage device 1 of the first embodiment, the washers 23 and 33 fastened between the conduction hooks 22 and 32 and the lids 11 and 12 are used, and the flange portions of the side surface portions 61 and 71 This is done by interposing a conductor 150 between 61A and 71A. Thereby, in 1st Embodiment, since it is not necessary to screw the thing different from the conduction | electrical_connection hooks 22 and 32 to the inner periphery of the external terminals 21 and 31, while being able to reduce a number of parts, as above-mentioned. Since only the conductor 150 is interposed, voltage detection can be easily performed.

  Here, in the first embodiment, it is preferable that the male washer 23 is integrated with the male conduction hook 22 and the female washer 33 is integrated with the female conduction hook 32. Thereby, since the number of parts of the electrical storage element 1 can be reduced, the assembly time of the electrical storage element 1 can be shortened and the electrical storage element 1 can be reduced in weight.

  In the first embodiment, axially opposed end surfaces of the inner cylindrical portions 41 and 51 of the male side conduction hook 22 and the female side conduction hook 32 abut against each other, and the outer peripheral surface of the outer cylindrical portion 42 of the male side conduction hook 22 And the inner conductive surface of the outer cylindrical portion 52 of the female side conduction hook 32 are brought into pressure contact with each other, so that the male side conduction hook 22 and the female side conduction hook 32 are connected. 32 can be attached and detached with one touch. Therefore, workability can be improved. Moreover, in the connection state of the male side conduction hook 22 and the female side conduction hook 32, the mutually opposing end surfaces of the inner cylindrical portions 41 and 51 of the male side conduction hook 22 and the female side conduction hook 32 are abutted. Positioning can be performed. In addition, as a result, a high load is generated between the outer peripheral surface of the outer cylindrical portion 42 of the male-side conduction hook 22 and the inner peripheral surface of the outer cylindrical portion 52 of the female-side conduction hook 32 by appropriately designing the press-contact portions. Even if it does, since the position of the location where it mutually press-contacted is hold | maintained, generation | occurrence | production of the play by displacing in the direction where the generated load is canceled can be prevented, and thereby connection resistance can be reduced. . Furthermore, since a reaction force is generated at the end surfaces of the inner cylindrical portions 41 and 51 that are abutted against each other, relative rotation of the male side conduction hook 22 and the female side conduction hook 32 can be prevented. Further, a current path is formed between the inner cylindrical portion 41 of the male side conduction hook 22 and the end surfaces of the inner cylindrical portion 51 of the female side conduction hook 32 that are abutted against each other, and the outer cylindrical portion 42 of the male side conduction hook 22. Current path is formed between the outer circumferential surface of the female side conduction hook 32 and the inner circumferential surface of the outer cylindrical portion 52 of the female side conduction hook 32, so that the male side conduction hook 22 and the female side conduction hook 32 have an outer cylindrical portion and an inner cylindrical portion. Two current paths are formed. Accordingly, the area through which the current flows can be increased, so that a large current can be passed. Furthermore, since it is not necessary to form a screw portion for connecting the conduction hooks 22 and 32, the manufacturing cost can be reduced.

  In particular, in a connected state of the male side conduction hook 22 and the female side conduction hook 32, the enlarged diameter part 42 </ b> B of the outer cylindrical part 42 of the male side conduction hook 22 and the reduced diameter part 52 </ b> B of the outer cylindrical part 52 of the female side conduction hook 32. Can be elastically pressed with each other, so that the connection resistance between the male side conduction hook 22 and the female side conduction hook 32 can be reduced. Further, the claws 43A and 53A are used as the engaging portions of the fastening jigs 110 and 120, and the male side conduction hook 22 and the female side conduction hook 32 are screwed and fixed to the upper lid 11 and the lower lid 12, so that the fixation is easy. Can be done. Further, since the claws 43A and 53A of the male terminal 22 and the female terminal 32 can be used as a remaining area left between the outer cylindrical portions 42 and 52, the claws 43A and 53A and the outer cylindrical portions 42 and 52 are made efficient. Can be well formed. In addition, since the numbers of claws 43A and 53A of the claw portions 43 and 53 of the male side conduction hook 22 and the female side conduction hook 32 are different from each other, the male side conduction hook 22 and the female side conduction hook 32 can be easily identified. it can. Further, since the adjacent claw 44A of the male side conduction hook 22 can be connected by the connecting portion 44B, the shapes of the claws 43A and 53A of the male side conduction hook 22 and the female side conduction hook 32 are different. The conduction hook 22 and the female conduction hook 32 can be easily identified. Moreover, since the nail | claw 44A is connected by the connection part 44B, it can have big intensity | strength.

  Further, assuming that the number of claws 43A and 53A of the male conduction hook 22 and the female conduction hook 32 is a multiple of the number of protrusions of the tightening jig, screws to the lids 11 and 12 of the conduction hooks 22 and 32 are provided. A common fastening jig 130 can be used for fastening. Furthermore, the claws 43A and 53A of the male side conduction hook 22 and the female side conduction hook 32 can be configured to approach the mating member as they go outward in the radial direction, so that the claws 43A and 53A can be used when the screws are fastened. The engagement allowance of the fastening jigs 110 and 120 with respect to can be increased. In addition, in voltage detection, it is not necessary to screw a part other than the conduction hooks 22 and 32 to the inner periphery of the external terminals 21 and 31, so that the number of parts can be reduced and the flanges of the washers 23 and 33 can be reduced. Voltage detection can be easily performed only by interposing the conductor 150 between 61A and 71A. Further, since the washers 23 and 33 can be formed integrally with the male side conduction hook 22 and the female side conduction hook 32, the number of parts of the element 1 can be reduced, and the assembly time of the element 1 can be shortened. It is possible to reduce the weight of the element 1.

(2) Second Embodiment Next, a bus bar according to a second embodiment of the present invention will be described with reference to the drawings. FIG. 13 shows a bus bar 200 according to the second embodiment of the present invention, in which (A) is a top view and (B) is a side sectional view. (B) is a sectional side view in the arrow direction CC of (A). In addition, the same code | symbol is attached | subjected to the same component as 1st Embodiment, and the description is abbreviate | omitted.

  The bus bar 200 includes a bus bar plate 210 having a rectangular shape. A male side conduction hook 220 is fixed to one end portion of the bus bar plate 210 by welding, and a female side conduction hook 230 is fixed to the other end portion of the bus bar plate 210 by welding. The male conduction hook 220 is the same as that of the first embodiment except that the claw portion 221 having the connecting portion 222 does not rise upward as it goes outward in the radial direction and is formed along the upper surface of the bus bar plate 210. It has the same configuration as the side conduction hook 22. Such a claw portion 221 is used as a welding allowance. The female side conduction hook 230 is the same as the female side conduction hook 32 of the first embodiment except that the claw portion 231 does not rise upward as it goes outward in the radial direction and is formed along the upper surface of the bus bar plate 210. Have the same configuration. Such a claw portion 231 is used as a welding allowance.

  In the bus bar 200, the female conduction hook 32 of the female terminal part 30 of the electricity storage element 1 is connected to the male conduction hook 220, and the male conduction hook of the male terminal part 20 of the other electricity storage element 1 is connected to the female conduction hook 230. 22 is connected. When a large number of power storage elements 1 are connected using a plurality of bus bars 200, the plurality of bus bars 200 are arranged in a staggered pattern.

  In the bus bar 200 of the second embodiment, the same actions and effects as in the first embodiment can be obtained.

The structure of the electrical storage element which concerns on 1st Embodiment of this invention is represented, (A) is a perspective view, (B) is a side view. It is a top view of the electrical storage element of FIG. It is a bottom view of the electrical storage element of FIG. The structure of the male side conduction | electrical_connection hook which concerns on 1st Embodiment of this invention is represented, (A) is a sectional side view, (B) is a top view. The structure of the female side conduction | electrical_connection hook which concerns on 1st Embodiment of this invention is represented, (A) is a sectional side view, (B) is a top view. The structure of the washer which concerns on 1st Embodiment of this invention is represented, (A) is a sectional side view, (B) is a top view. It is a bottom view showing the composition of the tightening jig used for the male side conduction hook concerning a 1st embodiment of the present invention. It is a bottom view showing the structure of the clamping jig used for the female side conduction hook concerning a 1st embodiment of the present invention. It is a bottom view showing the composition of the tightening jig used for the male side conduction hook and female side conduction hook concerning a 1st embodiment of the present invention. FIG. 8 is a side cross-sectional view illustrating a state in which a screw is fastened by using the tightening jig illustrated in FIG. 7 for a male side conduction hook. It is a figure for demonstrating the connection method of the electrical storage element which concerns on 1st Embodiment of this invention, (A) is a sectional side view of the male terminal part of one electrical storage element, (B) is the female of another electrical storage element. A side sectional view of a terminal part, (C) is a side sectional view showing a state where a male terminal part shown in (A) and a female terminal part shown in (B) are connected. It is a sectional side view showing the state which performs voltage detection in the connection state of the male terminal part and female terminal part which are shown in FIG.11 (C). The bus bar which concerns on 2nd Embodiment of this invention is represented, (A) is a top view, (B) is a sectional side view.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Power storage element, 10 ... Case (main body), 11 ... Upper lid, 12 ... Lower lid, 22, 220 ... Male side conduction hook (male terminal), 32, 230 ... Female side conduction hook (female terminal), 23 ... Male Side washer (washer), 33 ... Female side washer (washer), 41, 51 ... Inner cylindrical portion, 41A, 51A ... Female screw portion (screw portion), 42, 52 ... Outer cylindrical portion, 42B ... Expanded diameter portion, 43 53, 221, 231 ... claw, 43A, 44A, 53A ... claw, 44B, 222 ... connecting part, 52B ... reduced diameter part, 110, 120, 130 ... tightening jig (tool), 112, 122, 132 ... Projection (teeth), 150 ... conductor, 200 ... bus bar, 210 ... bus bar plate

Claims (12)

A male terminal having an outer cylindrical portion and an inner cylindrical portion formed inside the outer cylindrical portion;
A female terminal having an outer cylindrical portion and an inner cylindrical portion formed inside the outer cylindrical portion;
An end surface facing the axial direction of the inner cylindrical portion of the male terminal and an end surface facing the axial direction of the inner cylindrical portion of the female terminal are abutted against each other, and the outer peripheral surface of the outer cylindrical portion of the male terminal and the female terminal A connection structure for a storage element, wherein the male terminal and the female terminal are connected to each other when the inner peripheral surface of the outer cylindrical portion is in pressure contact with each other. The outer peripheral surface of the outer cylindrical portion of the male terminal has a diameter-expanding portion that expands in the radial direction as the distance from the female terminal side increases.
In a state where the male terminal and the female terminal are connected, the enlarged diameter portion of the outer cylindrical portion of the male terminal and the inner peripheral surface of the outer cylindrical portion of the female terminal are elastically pressed against each other. The connection structure of the electricity storage element according to claim 1, wherein The inner peripheral surface of the outer cylindrical portion of the female terminal has a reduced diameter portion that radially decreases in diameter as the distance from the male terminal side increases.
The outer peripheral surface of the outer cylindrical portion of the male terminal and the reduced diameter portion of the outer cylindrical portion of the female terminal are elastically pressed with each other in a state where the male terminal and the female terminal are connected. The connection structure of the electricity storage element according to claim 1 or 2. A screw part is formed on the inner peripheral surface of the inner cylindrical part of the male terminal and the female terminal,
A plurality of claws protruding outward in the radial direction are formed on the outer peripheral surface of the outer cylindrical portion of the male terminal and the female terminal,
The connection structure for a storage element according to any one of claims 1 to 3, wherein the claw is an engaging part of a predetermined tool used when the screw of the screw part is fastened. The male terminal and the inner cylindrical part and the outer cylindrical part of the female terminal are formed by projecting a plate material in the plate thickness direction,
The said nail | claw consists of the remainder area | region left between the said outer side cylindrical parts, The connection structure of the electrical storage element of Claim 4 characterized by the above-mentioned.   6. The storage element connection structure according to claim 4, wherein the number of claws of the male terminal and the female terminal is different from each other. The claws of the male terminal and the female terminal are formed at equal intervals along the circumferential direction,
The number of the claws of the male terminal and the female terminal is a positive multiple of the number of teeth of the predetermined tool, and the connection structure for a storage element according to any one of claims 4 to 6.   8. The connection structure for a storage element according to claim 4, wherein the adjacent claws of at least one of the male terminal and the female terminal are connected by a connecting portion. 9.   9. The electric storage element according to claim 4, wherein the claw of the male terminal and / or the female terminal is closer to the counterpart terminal as it goes radially outward. Connection structure. Provided with a washer having a flange protruding outward in the radial direction on the side surface formed along the outer peripheral edge of the base having a disk shape,
The connection of the electricity storage element according to claim 1, wherein the washer is interposed and tightened between at least one of the male terminal and the female terminal and a body of the electricity storage element. Construction.   11. The connection structure for a storage element according to claim 10, wherein the washer is formed integrally with at least one of the male terminal and the female terminal. In the bus bar provided with the male terminal and the female terminal according to claim 1,
With a busbar plate,
The bus bar, wherein the male terminal is fixed to one end portion of the bus bar plate, and the female terminal is fixed to the other end portion of the bus bar plate.

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