JP2012028061A - Electrode terminal connection structure and bus bar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrode terminal connection structure and a bus bar that suitably secure area of contact between an electrode terminal (a positive electrode terminal or negative electrode terminal) of a power storage element and the bus bar.SOLUTION: An electrode terminal connection structure has a tapered electrode terminal which has a smaller diameter on a tip side than on a base end side, and a plurality of power storage elements arranged side by side are electrically connected through a bus bar provided to the electrode terminal. The electrode terminal connection structure also has a cylindrical connection part which deforms in conformity with the shape of the electrode terminal by being pressed from the tip side to the base end side of the electrode terminal to form a contact surface with a peripheral surface such that a dimeter of an inner periphery matches a diameter of a tapered peripheral surface of the electrode terminal.

Description

  The present invention relates to a connection structure between power storage elements having electrode terminals and a bus bar for electrically connecting power storage elements.

  In the assembled battery, a plurality of single cells are electrically connected in series, and a predetermined voltage value is obtained. Specifically, in two unit cells electrically connected in series, the electrode terminal (positive electrode terminal) of one unit cell is connected to the electrode terminal (negative electrode terminal) of the other unit cell via a bus bar. ing.

  In the electrical connection between the electrode terminal and the bus bar, the contact area between the outer peripheral surface of the positive electrode terminal (or the negative electrode terminal) of the unit cell and the bus bar is relative to the necessary current flowing through the unit cell or flowing from the unit cell. It needs to be secured appropriately.

JP 2002-352792 A Utility Model Registration No. 3097397 Utility Model Registration No. 3099596 JP 2003-187872 A

  The present invention provides an electrode terminal connection structure and a bus bar that can appropriately ensure a contact area between an electrode terminal (a positive electrode terminal or a negative electrode terminal) of a power storage element and a bus bar.

  The electrode terminal connection structure in one embodiment of the present invention has a plurality of power storage elements arranged adjacent to each other, each having an electrode terminal formed in a tapered shape having a diameter on the distal end side smaller than the diameter on the proximal end side. The electrode terminal connection structure is electrically connected via a bus bar provided in the electrode terminal, and is deformed along the shape of the electrode terminal by being pressed from the distal end side to the proximal end side of the electrode terminal. And a cylindrical connecting portion that forms a contact surface with the peripheral surface whose inner peripheral diameter matches the diameter of the tapered peripheral surface of the electrode terminal.

  Further, the inner peripheral diameter is deformed so as to extend along the taber-shaped peripheral surface of the electrode terminal, and the contact surface in close contact with the periphery of the electrode terminal is formed.

  Moreover, the said contact surface presses the whole surrounding surface of the said electrode terminal which contacts the said contact surface with the pressure based on the elastic deformation and plastic deformation along the shape of the said electrode terminal.

  Moreover, the diameter of the inner periphery is larger than the diameter of the tip portion of the electrode terminal and smaller than the diameter of the peripheral surface near the tip portion.

  The connecting portion has a length corresponding to the length of the peripheral surface from the distal end side to the proximal end side of the electrode terminal, and one end in the length direction is open and extends in the length direction. A cylindrical member having a peripheral surface.

  In addition, one or a plurality of protrusions protruding outward and extending from the distal end side to the proximal end side of the electrode terminal are formed on the peripheral surface of the electrode terminal, and the connection portion is the distal end of the electrode terminal By pressing from the side toward the base end side, the first peripheral surface deforms along the shape of the electrode terminal, and the inner peripheral diameter matches the diameter of the tapered peripheral surface of the electrode terminal. While forming a contact surface, the part corresponding to the said protrusion part deform | transforms along the shape of the said protrusion part, and forms the 2nd contact surface which contacts the protrusion surface of the said protrusion part.

  Further, a part of the inner periphery of the connecting portion is cut by the protruding portion, so that it deforms along the shape of the protruding portion.

  Moreover, a guide groove or a slit can be formed on the inner peripheral surface corresponding to the protruding portion.

  Further, in one embodiment of the present invention, the bus bar for electrically connecting a plurality of power storage elements arranged adjacent to each other is provided in the power storage element, and the distal end side diameter is smaller than the proximal end side diameter. The electrode terminal formed in a tapered shape is pressed along the shape of the electrode terminal by being pressed from the distal end side to the proximal end side of the electrode terminal, and the inner circumference diameter is a taper of the electrode terminal. A cylindrical connecting portion that forms a contact surface with the peripheral surface that matches the diameter of the peripheral surface.

  According to this invention, since the connection part in which the contact surface along the shape of an electrode terminal is formed is provided, the contact area of an electrode terminal and a bus-bar can be ensured appropriately.

It is sectional drawing of the electrical storage module which shows the schematic structural example of the electrode terminal connection structure in Example 1 which concerns on this invention. It is a perspective view which shows an example of the connection relationship between the arrangement | sequence relationship of the electrical storage module in Example 1 which concerns on this invention, and a bus bar. It is an enlarged view of the electrode terminal and bus bar of the electrode terminal connection structure in Example 1 which concerns on this invention. It is a figure which shows an example of the connection process of the electrode terminal and bus bar in Example 1 which concerns on this invention. It is a figure which shows an example of the electrode terminal of the electrode terminal connection structure in Example 2 which concerns on this invention. It is an example (a) of sectional drawing of the electrode terminal connection structure in Example 2 which concerns on this invention, and an example of AA sectional drawing in a surface perpendicular | vertical to a connection direction.

  Examples of the present invention will be described below.

Example 1
An electrode terminal connection structure according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an example of a cross-sectional view of a power storage module showing a schematic configuration example of an electrode terminal connection structure in the present embodiment, and FIG. 2 shows an arrangement relationship of single cells (power storage elements) forming the power storage module, It is a perspective view which shows an example of a connection relationship with a bus bar. FIG. 3 is an enlarged view of the electrode terminals and bus bars provided in the unit cell of the electrode terminal connection structure in the present embodiment, and FIG. 4 is a connection process of the electrode terminals and bus bars in the electrode terminal connection structure of the present embodiment. It is a figure which shows an example.

  As shown in FIG. 2, in the power storage module having the electrode terminal connection structure in the present embodiment, a plurality of single cells 1 are arranged side by side (aligned in the X direction in which the positive electrode terminal 12 and the negative electrode terminal 13 are arranged). The positive terminal 12 of one unit cell 1 and the negative terminal 13 of the other unit cell 1 are electrically connected by a bus bar 20. In the example of FIG. 2, for example, the single cells 1 are arranged in a plurality of layers in the Y direction orthogonal to the direction in which the positive electrode terminals 12 and the negative electrode terminals 13 are arranged, and the single cells 1 are connected by the bus bar 20. Thus, a power storage module can be formed.

  As shown in FIG. 1, the single battery (storage element) 1 has a battery case 10 and a power generation element 11, and the power generation element 11 is accommodated in the battery case 10. As the unit cell 1, a secondary battery such as a nickel metal hydride battery or a lithium ion battery can be used. Note that an electric double layer capacitor (storage element) may be used instead of the secondary battery.

  The battery case 10 has an upper surface 10a, a bottom surface 10b, two first side surfaces 10c, and two second side surfaces 10d. The first side surface 10c is a surface orthogonal to the top surface 10a and the bottom surface 10b, and is a surface orthogonal to the direction in which a positive electrode terminal (electrode terminal) 12 and a negative electrode terminal (electrode terminal) 13 described later are arranged (X direction in FIG. 2). It is. The second side surface 10d is a surface orthogonal to the top surface 10a and the bottom surface 10b, and is a surface parallel to the direction in which the positive electrode terminal 12 and the negative electrode terminal 13 are arranged (a surface orthogonal to the Y direction in FIG. 2).

  The power generation element 11 is an element that can be charged and discharged. Specifically, the power generation element 11 has a positive electrode element, a negative electrode element, and a separator (including an electrolytic solution) disposed between the positive electrode element and the negative electrode element. is doing. In the positive electrode element, a positive electrode layer containing a positive electrode active material is formed on the surface of a current collector plate. In the negative electrode element, a negative electrode layer containing a negative electrode active material is formed on the surface of a current collector plate.

  Two electrode terminals, a positive electrode terminal 12 and a negative electrode terminal 13 are provided on the upper surface 10a of the battery case 10, and the positive electrode terminal 12 is electrically connected to the positive electrode element of the power generation element 11, and the negative electrode terminal 13 is The power generation element 11 is electrically connected to the negative electrode element. For example, a tab (positive electrode tab) is provided on the positive electrode element of the power generation element 11, and the positive electrode tab can be connected to the positive electrode terminal 12. The same applies to the connection between the negative electrode element of the power generation element 11 and the negative electrode terminal 13.

  The positive electrode terminal 12 is a columnar electrode terminal extending in the vertical direction of the upper surface 10 a of the battery case 10. The battery case 10 has a tapered peripheral surface (outer peripheral surface) 12c having a diameter on the distal end portion 12a side smaller than a diameter on the proximal end portion 12b side, with the upper surface 10a side of the battery case 10 being the base end portion 12b. The tapered peripheral surface 12c is a tapered surface (an inclined surface) that is inclined linearly from the distal end portion 12a to the proximal end portion 12b. The positive electrode terminal 12 can be formed of a conductive metal such as aluminum, iron, copper (copper alloy).

  The positive electrode terminal 12 is formed with a screw hole portion 12d corresponding to the screw portion 41 of the bolt (fastening member) 40 having a predetermined depth from the end surface 12e of the tip end portion 12a. The positive terminal 12 and the bus bar 20 are fastened via bolts 40, and the bus bar 20 is fastened and fixed to the positive terminal 12 while the positive terminal 12 and the bus bar 20 are electrically connected.

  The negative electrode terminal 13 has the same structure as that of the positive electrode terminal 12 and is provided on the upper surface 10a of the battery case 10 that is separated from the positive electrode terminal 12 by a predetermined distance and extends in the vertical direction of the upper surface 10a. Terminal. The upper surface 10a side of the battery case 10 is a base end portion 13b, the diameter of the tip end portion 13a side is smaller than the diameter of the base end portion 13b side, and the taper-shaped circumference is inclined linearly from the tip end portion 13a to the base end portion 13b. It has a surface 13c. Similarly to the positive electrode terminal 12, the negative electrode terminal 13 can be formed of a conductive metal such as aluminum, iron, or copper (copper alloy).

  Further, also in the negative electrode terminal 13, a screw hole portion 13d corresponding to the screw portion 41 of the bolt (fastening member) 40 having a predetermined depth from the end surface 13e of the tip end portion 13a is formed. The bus bar 20 and the negative electrode terminal 13 are fastened via the bolt 40, and the bus bar 20 is fastened and fixed to the negative electrode terminal 13 while the negative electrode terminal 13 and the bus bar 20 are electrically connected.

  The bus bar 20 of the present embodiment is a connecting member that is connected to each of the positive terminal 12 of one unit cell 1 and the negative terminal 13 of the other unit cell 1 and electrically connects the unit cells 1 in series. The bus bar 20 is provided with a metal plate 21 formed of a plate-like conductive member, and a connection portion 22 and a connection portion 23 that are spaced apart in the length direction of the metal plate 21.

  And the electrode terminal connection structure of a present Example is the front-end | tip of the connection part 22 (connection part 23 corresponding to the negative electrode terminal 13) of the bus-bar 20 corresponding to the positive electrode terminal 12 with respect to the positive electrode terminal 12 (negative electrode terminal 13). From the side toward the base end, in other words, along the axial direction L of the columnar positive terminal 12, the connection is made by pressing from above the positive terminal 12. At this time, the cylindrical connecting portion 22 is deformed along the shape of the positive electrode terminal 12 (negative electrode terminal 13), and the positive electrode terminal 12 (negative electrode terminal 13) whose inner diameter matches the diameter of the tapered peripheral surface 12c. ) To form a contact surface with the peripheral surface.

  The connecting portion 22 has a predetermined length corresponding to the length of the tapered peripheral surface 12c from the distal end portion 12a to the proximal end portion 12b of the positive electrode terminal, and one end in the length direction is opened and the other end is a metal. It is a cylindrical member which is connected to the plate 21 and has an inner peripheral surface 22b extending in the length direction. The inner peripheral surface 22b is an inner surface of the peripheral wall portion 22c constituting the cylindrical member, and the peripheral wall portion 22c has a predetermined thickness (for example, 1 mm to 2 mm). In addition, the connection portion 22 can be formed of a conductive metal such as copper, and in this embodiment, a conductive member having lower rigidity than the positive electrode terminal 12 (negative electrode terminal 13) is used (the positive electrode terminal 12 and the positive electrode terminal 12). The negative electrode terminal 13 is made of a conductive member having higher rigidity than the connecting portions 22 and 23 and having a predetermined strength).

  In addition, insertion holes 21 a and 21 b through which the screw portions 41 of the bolts 40 are inserted are provided at positions in the length direction corresponding to the connection portions 22 and the connection portions 23 of the metal plate 21 of the bus bar 20. It penetrates to the hollow interior surrounded by the surface 22b. That is, an insertion hole through which the screw portion 41 of the bolt 40 corresponding to the insertion hole 21a is inserted is formed in the base portion 22e on the metal plate 21 side of the connection portion 22 and the connection portion 23.

  Here, with reference to FIG. 3, the connection part 22 and the positive electrode terminal 12 of the bus-bar 20 of a present Example are demonstrated in detail. In addition, about the connection part 23 and the negative electrode terminal 13, since it is the structure similar to the connection part 22 and the positive electrode terminal 12, the description is abbreviate | omitted.

  As shown in FIG. 3, the positive electrode terminal 12 protrudes upward from the upper surface 10a of the battery case 10, and the diameter D1 of the distal end portion 12a is smaller than the diameter D2 of the base end portion 12b located on the upper surface 10a side, and the upper surface 10a. And a tapered peripheral surface 12c inclined at a predetermined angle α with respect to a direction (Z direction in FIG. 2) perpendicular to the axis. That is, the positive electrode terminal 12 has a tapered shape in which the diameter of the peripheral surface 12c increases from the distal end portion 12a to the proximal end portion 12b. A screw hole 12d having a predetermined depth is formed in the inner direction from the upper surface 12e of the tip 12a. The diameter of the screw hole 12d is a size corresponding to the diameter of the screw part 41 of the bolt 40.

  The connecting portion 22 of the bus bar 20 includes a hollow formed by extending an inner peripheral surface 22b having the same diameter as the diameter d1 of the opening 22a in the length direction, and the positive electrode terminal 12 is disposed inside the hollow surrounded by the inner peripheral surface 22b. Inserted. The inner peripheral surface 22b of the present embodiment has the same diameter d1 (maximum inner diameter d1) in the length direction of the peripheral wall portion 22c, and the inner peripheral surface 22b is a surface parallel to the length direction.

  The diameter of the opening 22a (the diameter of the inner peripheral surface 22b) d1 is larger than the diameter D1 of the tip portion 12a of the positive electrode terminal 12, and the peripheral surface near the tip portion 12a (near the end portion of the peripheral surface 12c adjacent to the end surface 12e). It is formed smaller than the diameter D3. In other words, the diameter of the opening 22a is such that when the end portion 22d of the peripheral wall portion 22c on the opening 22a side abuts on the end portion of the peripheral surface 12c on the front end portion 12a side, the end surface 12e of the front end portion 12a is It has a size (D2> D3 ≧ d1 ≧ D1) within the inner peripheral surface 22d and located on substantially the same plane as the opening surface of the opening 22a.

  The connection portion 22 is connected to the positive electrode terminal 12 from the end surface 12e direction of the distal end portion 12a of the positive electrode terminal 12 toward the base end portion 12b and is pressed against the positive electrode terminal 12 in a state where a predetermined pressure is applied. It connects to the said positive electrode terminal 12 so that the positive electrode terminal 12 may be press-fit with respect to the hollow inside surrounded by the surrounding surface 12c. At this time, the diameter of the peripheral surface 12c of the positive electrode terminal 12 is larger than the diameter d1 of the opening 22a in the direction from the distal end portion 12a to the proximal end portion 12b, so that the positive terminal 12 is inserted into the hollow portion of the connection portion 22 from the opening 22a. The inner peripheral surface 12c is deformed so as to expand while contacting the peripheral surface 12c along the taber-shaped peripheral surface 12c of the positive electrode terminal 12, and is in close contact with the entire peripheral surface 12c of the base end portion 12b from the distal end portion 12a. An inner peripheral surface 22c (contact surface) that matches the diameter of the peripheral surface 12 is formed.

  FIG. 4 is a diagram illustrating an example of a connection process between the electrode terminals (the positive terminal 12 and the negative terminal 13) and the bus bar 20 in the electrode terminal connection structure according to the present embodiment.

  The connection part 22 and the connection part 23 of the bus bar 20 are connected to the positive electrode terminal 12 of the first unit cell 1 and the negative electrode terminal 13 of the second unit cell 1 arranged side by side in the arrangement direction of the positive electrode terminal 12 and the negative electrode terminal 13. Position each one. For example, the central axis of the positive electrode terminal 12 and the central axis of the connecting portion 22 are matched (FIG. 4A).

  Then, the connecting portions 22 and 23 are pressed against the positive electrode terminal 12 and the negative electrode terminal 13 while applying a predetermined pressure from the distal end side to the proximal end side of the positive electrode terminal 12 and the negative electrode terminal 13. At this time, the connection portions 22 and 23 are pressed against the electrode terminals in a state where a predetermined pressure is applied, and the connection portions 22 and 23 are formed of a conductive member having lower rigidity than the positive electrode terminal 12 and the negative electrode terminal 13. Therefore, for example, it is mounted on the positive terminal 12 while being deformed so as to spread along the taber-shaped peripheral surface 12c of the positive terminal 12 inserted into the hollow inside of the connection portion 22 from the opening 22a (FIG. 4). (B)).

  More specifically, as shown in FIG. 4B, the peripheral wall portion 22c where the inner peripheral surface 22c comes into contact with the tapered peripheral surface 12c is opposed to the pressure from the peripheral surface 12c against the pressure in the axial direction L. A force is generated (arrow in FIG. 4B), a force is applied in a direction orthogonal to the axial direction L, and the material is deformed so as to spread along the peripheral surface 12c (elastic deformation and plastic deformation). The inner peripheral surface 22c of the connecting portion 22 is deformed while being in close contact with the peripheral surface 12c along the peripheral surface 12c, and is predetermined until the end surface 12e at the distal end portion 12a of the positive electrode terminal 12 contacts the base portion 22e of the peripheral wall portion 22c. Press against the positive terminal 12 with pressure. Thereafter, the screw portion 41 of the bolt 40 is inserted into the insertion hole 21a of the bus bar 20, the screw portion 41 and the screw hole 12d are screwed and fastened, and the connection portion 22 is fixed to the positive terminal 12 (FIG. 4 ( c)). The same applies to the negative electrode terminal 13 and the connecting portion 23.

  As shown in FIG. 4C, the connection portion 22 of the electrode terminal connection structure of this embodiment forms a contact surface that is elastically deformed and plastically deformed along the shape of the positive electrode terminal 12 and is in close contact with the peripheral surface 12c. . For this reason, the connection part 22 is used for the entire peripheral surface 12c of the positive electrode terminal 12 in contact with the contact surface to be deformed in the pressure (restoring force) based on the deformation in the elastic region along the shape of the positive electrode terminal 12 or in the plastic region. Pressing with the pressure (return force) based on. That is, the positive electrode terminal 12 and the connection part 22 are electrically connected in a state where a predetermined pressure (surface pressure) is applied to the entire peripheral surface 12c.

  Thus, the electrode terminal connection structure of the present embodiment includes a connection portion that deforms along the shape of the outer peripheral surface of the electrode terminal and forms a contact surface having an inner diameter that matches the diameter of the outer peripheral surface of the electrode terminal. The contact area is large and can be easily secured. For this reason, the electrode terminal connection structure which ensured an appropriate contact area with respect to the performance (input / output current amount) of the unit cell 1 can be provided.

  In addition, the electrode terminal can be reduced in size with respect to the necessary current flowing through the cell 1 or from the cell 1, and a large current can be input / output with a small electrode terminal.

  For example, in the case of a connection part that has the same shape as that of the electrode terminal and ensures adhesion with the outer peripheral surface of the electrode terminal, an inner peripheral surface of the same shape that contacts the outer peripheral surface of the electrode terminal is formed. There is a need to. For this reason, the high dimensional accuracy of the inner peripheral surface of a connection part is requested | required, and manufacture of a connection part (bus bar) is difficult.

  On the other hand, the connection part of the electrode terminal connection structure of the present embodiment is deformed along the shape of the outer peripheral surface of the electrode terminal by being pressed against the electrode terminal, and has an inner diameter that matches the diameter of the outer peripheral surface of the electrode terminal. Since the contact surface is formed, the dimensional accuracy of the connecting portion is not required to be high, and the manufacturing of the connecting portion is facilitated. In addition, in a connection part that forms a connection part having the same shape as the electrode terminal and ensures adhesion with the outer peripheral surface of the electrode terminal, assembly accuracy is required in the assembly work of the connection part to the electrode terminal. In the electrode terminal connection structure of the present embodiment, the connecting portion is deformed by being pressed against the electrode terminal, so that a contact surface having an inner diameter that matches the diameter of the outer peripheral surface of the electrode terminal is formed. .

  Furthermore, for example, when applying a force to a part of the connection portion from a direction perpendicular to the outer peripheral surface of the electrode terminal to achieve adhesion to the outer peripheral surface, the inner peripheral surface of the connection portion and the outer peripheral surface of the electrode terminal where the force is applied Although the contact with the electrode terminal can be ensured, the force concentrates on a part of the connection part, so the part where the force is not applied with the force applied point is lifted with respect to the outer peripheral surface of the electrode terminal, and the non-contact state Become. For this reason, a gap is formed between the outer peripheral surface of the electrode terminal and the inner peripheral surface of the connection portion, and the contact area becomes small. However, in the electrode terminal connection structure of the present embodiment, the connection portion has the shape of the electrode terminal. Since the contact surface in close contact with the entire outer periphery is formed by deforming along the outer periphery of the electrode terminal, a contact area can be suitably ensured without causing a gap between the outer peripheral surface of the electrode terminal and the contact surface.

  Moreover, the electrode terminal connection structure of a present Example presses the whole outer peripheral surface of the electrode terminal which contacts a contact surface with the pressure based on the deformation along the shape of an electrode terminal, as shown in FIG.4 (c). As a result, the force does not concentrate on a part of the connection part, and a non-contact state with the outer peripheral surface of the electrode terminal can be suppressed, and a close contact surface is formed with no gap between the outer peripheral surface. The

  Moreover, the connection part of the present embodiment that forms the contact surface along the shape of the electrode terminal does not need to form a separate connection part with respect to the shape of the electrode terminal, for example, the electrode terminal having a different angle of the taper surface Even in the case of connecting between single cells having an electrode, it is possible to provide an electrode terminal connection structure capable of easily ensuring a contact area.

  In addition, although the present Example demonstrated as an example the connection parts 22 and 23 provided with the internal peripheral surface which has the uniform diameter d1 in a length direction, an internal peripheral surface may be a taper shape, for example. In this case, the tapered inner peripheral surface 12c is formed such that the diameter of the base portion 22e is larger than the diameter D1 of the distal end portion 12a of the positive electrode terminal 12, and the diameter d1 of the opening 22a is smaller than the diameter D2 of the base end portion 12b of the positive electrode terminal 12. The connection part 22 (connection part 23) can be comprised so that it may have.

  In the present embodiment, the inner peripheral surface of the connection portion of the bus bar 20 has been described as an example of being deformed so as to expand along the tapered peripheral surface of the electrode terminal. An aspect in which the inner peripheral surface of the connecting portion of the bus bar 20 is deformed so as to expand along the tapered peripheral surface of the electrode terminal by cutting the surface at the tip of the electrode terminal can be included.

(Example 2)
An electrode terminal connection structure according to the second embodiment of the present invention will be described with reference to FIGS. Here, members having the same functions as those described in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Hereinafter, differences from the first embodiment will be mainly described.

  In the present embodiment, protrusions 30 are formed on the outer peripheral surfaces of the electrode terminals (the positive terminal 12 and the negative terminal 13) of the first embodiment described above.

  As shown in FIG. 5, the protruding portion 30 protrudes outward from the peripheral surface 12 a of the positive electrode terminal 12, and extends in a straight line from the distal end portion 12 a to the proximal end portion 12 b of the positive electrode terminal 12. 30a, and its tip is formed at an acute angle. In addition, although the protrusion part 30 is provided in parallel with the axial direction L in the surrounding surface 12c from the front-end | tip part 12a to the base end part 12b, it is not restricted to this, For example, in the front view of the positive electrode terminal 12, the front-end | tip part 12a It can also be set as the linear protrusion part inclined with respect to the axial direction L toward the base end part 12b.

  The protruding portion 30 has a predetermined protruding height from the outer surface 12 c to the outside, and the protruding height is smaller (lower) than the thickness of the peripheral wall portion 22 c of the connecting portion 22 of the bus bar 20. Further, the protruding portion 30 can be provided integrally with the positive electrode terminal 12, and the protruding portion 30 is manufactured separately from the positive electrode terminal 12, and the protruding portion 30 is joined to the peripheral surface 12c of the positive electrode terminal 12 by welding or the like. Thus, the positive terminal 12 having the protrusion 30 can be formed.

  Moreover, the protrusion part 30 is comprised from the electroconductive member which has rigidity higher than the connection parts 22 and 23 similar to a positive electrode terminal, and has predetermined | prescribed intensity | strength. In the example of FIG. 5, four linear protrusions 30 are provided on the peripheral surface 12c, but one or a plurality of protrusions 30 may be provided. And the negative electrode terminal 13 can also be comprised as an electrode terminal which has the protrusion part 30 similarly to the positive electrode terminal 12 of a present Example.

  6A is a cross-sectional view of the electrode terminal connection structure in the present embodiment, and FIG. 6B is a cross-sectional view taken along the line AA in FIG. 6A.

  As described above, in the electrode terminal connection structure of the present embodiment, the connection portion 22 of the bus bar 20 is pressed against the positive terminal 12 in the same manner as in the first embodiment. It deforms along the peripheral surface 12 c) and is connected to the positive terminal 12.

  At this time, in this embodiment, since the protruding portion 30 is provided on the peripheral surface 12c of the positive electrode terminal 12, the connecting portion 22 is pressed from the distal end portion 12a of the positive electrode terminal 12 toward the proximal end portion 12b. Then, it deforms along the shape of the positive electrode terminal 12, and forms a contact surface (first contact surface) with the peripheral surface 12c in which the diameter of the inner peripheral surface matches the diameter of the tapered peripheral surface 12c of the positive electrode terminal 12. At the same time, a portion of the peripheral surface 12c corresponding to the projecting portion 30 is deformed along the shape of the projecting portion (projecting surface 30a) to form a contact surface (second contact surface) that contacts the projecting surface 30a of the projecting portion 30. .

  The contact surface (second contact surface) that contacts the protruding surface 30a of the protruding portion 30 is such that, for example, the inner peripheral surface of the peripheral wall portion 22c that constitutes the connecting portion 22 extends from the distal end portion 12a of the positive electrode terminal 12 to the proximal end portion 12b. The inner peripheral surface 22d of the peripheral wall portion 22c constituting the connecting portion 22 is formed at the tip of the protruding portion 30 (positive electrode terminal). 12 is formed by being deformed so as to spread along the protruding surface 30a protruding from the tapered peripheral surface 12c.

  FIG. 6 shows a contact surface (first surface) that deforms along the shape of the protruding portion 30 by cutting a part of the inner peripheral surface 22d of the connecting portion 22 by the protruding portion 30 and contacts the protruding surface 30a of the protruding portion 30. This is an example in which two contact surfaces are formed. As shown in FIG. 6B, the second contact surface is located outside the arc-shaped contact surface (first contact surface) with the peripheral surface 12c of the positive electrode terminal 12, and the thickness direction of the peripheral wall portion 22c. The protruding surface 30a is located inside the peripheral wall portion 22c.

  As described above, the electrode terminal connection structure according to the present embodiment is provided with the protruding portion that protrudes outward on the peripheral surface of the electrode terminal having the tapered peripheral surface. The contact area of the contact surface that comes into contact with the protruding surface is increased, and a larger contact area can be ensured.

  Moreover, as shown in FIG.6 (b), since the protrusion surface 30a is located in the inside of the surrounding wall part 22c in the thickness direction of the surrounding wall part 22c, and the protrusion part 30 bites into the surrounding wall part 22c, the protrusion part 30 connects. It can serve as a stop around the portion 22.

  In addition, a guide groove or a slit is formed in advance at a position corresponding to the protruding portion 30 of the inner peripheral surface 22c so that the inner peripheral surface 22c can be easily deformed along the shape of the protruding portion 30 (the protruding surface 30a). It can also be configured as follows.

1: Cell (electric storage element) 10: Battery case 10a: Top surface 10b: Bottom surface 10c: First side surface 10d: Second side surface 11: Power generation element
12: Positive terminal (electrode terminal) 12a: Front end portion 12b: Base end portion 12c: Peripheral surface (tapered surface)
12d: Screw hole 12e: End surface 13: Negative electrode terminal (electrode terminal) 13a: Tip portion 13b: Base end portion 13c: Circumferential surface (tapered surface)
13d: Screw hole 13e: End face 20: Bus bar 21: Metal plate 21a: Insertion hole 21b: Insertion hole 22: Connection part 22a: Opening 22b: Inner peripheral surface (contact surface) 22c: Peripheral wall part 22d: End part 22e: Base part 23 : Connection portion 23a: Opening 23b: Inner peripheral surface (contact surface) 23c: Peripheral wall portion 23d: End 23e: Base 30: Protruding portion 30a: Protruding surface 40: Bolt (fastening member) 41: Screw portion

Claims (9)

A plurality of power storage elements, which have electrode terminals formed in a tapered shape with a diameter on the distal end side smaller than a diameter on the proximal end side, and are arranged adjacent to each other are electrically connected via bus bars provided on the electrode terminals. An electrode terminal connection structure to be connected,
By being pressed from the distal end side to the proximal end side of the electrode terminal, the electrode terminal is deformed along the shape of the electrode terminal, and the diameter of the inner periphery matches the diameter of the tapered peripheral surface of the electrode terminal. An electrode terminal connection structure comprising a cylindrical connection portion forming a contact surface with a surface.   The diameter of the inner circumference is deformed so as to spread along a taber-like circumference of the electrode terminal, and the contact surface in close contact with the periphery of the electrode terminal is formed. Electrode terminal connection structure.   The said contact surface presses the whole surrounding surface of the said electrode terminal which contacts the said contact surface with the pressure based on the elastic deformation and plastic deformation along the shape of the said electrode terminal, The Claim 1 or 2 characterized by the above-mentioned. Electrode terminal connection structure.   The diameter of the inner periphery is larger than the diameter of the tip portion of the electrode terminal and smaller than the diameter of the peripheral surface in the vicinity of the tip portion. Electrode terminal connection structure.   The connecting portion has a length corresponding to the length of the peripheral surface from the distal end side to the proximal end side of the electrode terminal, and an inner peripheral surface that is open at one end in the length direction and extends in the length direction. 5. The electrode terminal connection structure according to claim 1, wherein the electrode terminal connection structure is a cylindrical member having a shape. On the peripheral surface of the electrode terminal, one or a plurality of protrusions protruding outward and extending from the distal end side to the proximal end side of the electrode terminal are formed,
The connecting portion is deformed along the shape of the electrode terminal by being pressed from the distal end side to the proximal end side of the electrode terminal, and an inner diameter is a diameter of a tapered peripheral surface of the electrode terminal. Forming a first contact surface with the peripheral surface that coincides with the projecting portion, and a portion corresponding to the projecting portion deforms along the shape of the projecting portion to contact the projecting surface of the projecting portion. The electrode terminal connection structure according to claim 1, wherein the electrode terminal connection structure is formed.   The electrode terminal connection structure according to claim 6, wherein a part of the inner periphery of the connection portion is cut along the shape of the protrusion by being cut by the protrusion.   The electrode terminal connection structure according to claim 6, wherein a guide groove or a slit is formed on an inner peripheral surface corresponding to the protruding portion. A bus bar for electrically connecting a plurality of power storage elements arranged adjacent to each other,
By being pressed from the distal end side of the electrode terminal toward the proximal end side with respect to the electrode terminal provided in the electricity storage element and formed in a tapered shape whose diameter on the distal end side is smaller than the diameter on the proximal end side, It has a cylindrical connecting portion that deforms along the shape of the electrode terminal and forms a contact surface with the peripheral surface whose inner peripheral diameter matches the diameter of the tapered peripheral surface of the electrode terminal. Bus bar.

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