WO2017199620A1

WO2017199620A1 - Terminal connection structure for battery pack

Info

Publication number: WO2017199620A1
Application number: PCT/JP2017/014273
Authority: WO
Inventors: 祐貴中條; 加藤　崇行; 浩生植田
Original assignee: 株式会社豊田自動織機
Priority date: 2016-05-18
Filing date: 2017-04-05
Publication date: 2017-11-23
Also published as: JP6729689B2; JPWO2017199620A1

Abstract

This terminal connection structure comprises: a first terminal block whereon a first bolt is fixed; a second terminal block whereon a second bolt is fixed, the second bolt having a different axis direction to that of the first bolt; a bent bus bar connecting the first bolt to the second bolt; a first nut screwed onto the first bolt and fastening one end side of the bus bar against the first terminal block; and a second nut screwed onto the second bolt and fastening the other end side of the bus bar against the second terminal block. Provided on the one end side of the bus bar is a hole portion through which the first bolt is inserted. Provided on the other end side of the bus bar is a cut-out portion which opens toward the other end of the bus bar, and through which the second bolt is inserted.

Description

Battery pack terminal connection structure

One aspect of the present invention relates to a terminal connection structure of a battery pack.

As a conventional battery pack terminal connection structure, for example, a technique described in Patent Document 1 is known. The terminal connection structure of the battery pack described in Patent Literature 1 includes a relay bus bar that connects the electrode terminal of the battery cell and the output line. The relay bus bar is bent. A through hole through which the set screw of the electrode terminal passes is provided on one end side of the relay bus bar, and a through hole through which a set screw screwed into a nut fixed to the end plate is provided on the other end side of the relay bus bar. It has been.

JP 2010-80353 A

By the way, in the terminal connection structure of the battery pack, the first bolt fixed to the first terminal block and the second bolt fixed to the second terminal block may be connected by the bus bar. At this time, when the axial direction of the first bolt is different from the axial direction of the second bolt, the through holes through which the first bolt and the second bolt pass are respectively provided at both ends as in the prior art. A bent bus bar is used. However, with such a structure, it is impossible to assemble the bus bar to the first terminal block and the second terminal block from one direction. For this reason, after passing the first bolt through one through hole of the bus bar, it is necessary to pass the second bolt through the other through hole of the bus bar while rotating the bus bar. Therefore, it is difficult to assemble the bus bar. Also, depending on component tolerances, the bus bar may not be assembled.

An object of one aspect of the present invention is to provide a battery pack terminal connection structure that can improve assemblability of a bus bar when bolts having different axial directions are connected by a bent bus bar.

A battery pack terminal connection structure according to one aspect of the present invention includes a first terminal block to which a first bolt is fixed, a second terminal block to which a second bolt having a different axial direction from the first bolt is fixed, A bent bus bar that connects the first bolt and the second bolt, a first nut that is screwed to the first bolt, and that fastens one end of the bus bar to the first terminal block, and a second bolt that is screwed. And a second nut for fastening the other end of the bus bar to the second terminal block. A hole through which the first bolt is inserted is provided at one end of the bus bar, and the other end of the bus bar is provided at the other end. The other end of the bus bar is provided with a notch through which the second bolt is inserted.

In such a battery pack terminal connection structure, when the bent bus bar is assembled to the first terminal block and the second terminal block, the first bolt is inserted into the hole provided at one end of the bus bar, and the bus bar With the second bolt inserted through the notch provided on the other end of the first screw, the first nut is screwed into the first bolt to tighten one end of the bus bar against the first terminal block, and the second bolt The second nut is screwed and the other end of the bus bar is tightened against the second terminal block. At this time, since the notch is open to the other end of the bus bar, when the bus bar is moved in the axial direction of the first bolt so that the first bolt passes through the hole, the second bolt passes through the notch. It becomes like this. Therefore, the bus bar can be assembled to the first terminal block and the second terminal block from one direction. Thereby, when connecting the 1st volt | bolt and 2nd volt | bolt from which an axial direction differs by a bent-shaped bus bar, the assembly | attachment property of a bus bar can be improved.

The second nut is in contact with the bus bar and the other end of the bus bar is tightened against the second terminal block. The second bolt has a contact area between the second nut and the bus bar that is loosened by the second nut. It may be arranged between a first position spaced from the bottom of the notch and a second position in contact with the bottom of the notch so as to have a minimum value that does not cause the.

Thus, since the second bolt is disposed between the first position and the second position, it is possible to widen a range in which a part tolerance is allowed in the notch portion of the bus bar. At this time, the first position is a position spaced from the bottom of the notch so that the contact area between the second nut and the bus bar is a minimum value that does not cause loosening of the tightening of the bus bar by the second nut. For this reason, the contact area between the second nut and the bus bar is always equal to or greater than the minimum value. Accordingly, it is possible to prevent the tightening of the other end of the bus bar by the second nut from being loosened due to the deformation of the second nut or the bus bar due to the increase in the contact surface pressure between the second nut and the bus bar. The second position is a position where the second bolt comes into contact with the bottom of the notch. For this reason, it becomes possible to prevent the bus bar from being assembled to the first terminal block and the second terminal block.

The bottom surface of the notch has a semicircular cross section, and the intermediate position between the first position and the second position is the center of a virtual circle virtually formed by the bottom surface of the notch when viewed from the axial direction of the second bolt. It may be offset to the open side of the notch.

In such a configuration, since the distance from the intermediate position between the first position and the second position to the first position and the second position becomes longer, the range allowing the part tolerance at the notch portion of the bus bar can be further widened. it can.

The bus bar is further provided with another bus bar connected to the second bolt in a state of being superimposed on the bus bar, and the other bus bar is provided with a hole through which the second bolt is inserted. You may clamp | tighten the other end side of a bus bar with respect to a 2nd terminal block with another bus bar in the state which contacted the bus bar.

In such a configuration, the second nut contacts another bus bar having a hole, and does not contact a bus bar having a notch. Therefore, even if the second bolt is arranged away from the bottom of the notch, a contact area between the second nut and the other bus bar is ensured, so that the other end side of the bus bar is inserted through the other bus bar by the second nut. And securely tightened against the second terminal block. Thus, even if the second bolt is arranged away from the bottom of the notch, there is no particular problem, so that the range for allowing the component tolerance in the notch of the bus bar can be sufficiently widened.

According to an aspect of the present invention, there is provided a battery pack terminal connection structure capable of improving the assemblability of a bus bar when bolts having different axial directions are connected by a bent bus bar.

FIG. 1 is a schematic side view showing a battery pack provided with a terminal connection structure according to an embodiment. FIG. 2 is a perspective view showing a terminal connection structure according to an embodiment. FIG. 3 is a cross-sectional view of the terminal connection structure shown in FIG. FIG. 4A is a plan view showing a part on one end side of the bus bar in the terminal connection structure, and FIG. 4B is a front view showing a part on the other end side of the bus bar in the terminal connection structure. FIG. 5A is a front view showing a state where the bolt is in a design position slightly spaced from the bottom of the notch, and FIG. 5B is a position where the bolt is on the open side of the notch from the design position. FIG. 5C is a front view showing a state in which the bolt is on the bottom side of the notch portion with respect to the design position. FIG. 6 is a conceptual diagram showing the design position of the bolt with respect to the notch of the bus bar. FIG. 7 is a cross-sectional view showing an example of a conventional terminal connection structure. FIG. 8 is a cross-sectional view showing a part of a terminal connection structure according to another embodiment. FIG. 9 is a plan view showing a portion excluding the nut in the terminal connection structure shown in FIG. FIG. 10 is a diagram for explaining a modification of the terminal connection structure. FIG. 11 is a diagram for explaining a modification of the terminal connection structure. FIG. 12 is a diagram for explaining a modification of the terminal connection structure. FIG. 13 is a diagram for explaining a modification of the terminal connection structure. FIG. 14 is a diagram for explaining a modification of the terminal connection structure.

Hereinafter, embodiments according to one aspect of the present invention will be described in detail with reference to the drawings. In the drawings, the same or equivalent elements are denoted by the same reference numerals, and redundant description is omitted.

FIG. 1 is a schematic side view showing a battery pack provided with a terminal connection structure according to an embodiment. In FIG. 1, the battery pack 1 includes a rectangular parallelepiped housing 2 and a battery module 3 accommodated in the housing 2. Connector terminals 4 </ b> A and 4 </ b> B are attached to the upper surface of the housing 2. The connector terminal 4A is a positive connector terminal, and the connector terminal 4B is a negative connector terminal.

The battery module 3 has a plurality of batteries 5 such as a plurality of lithium ion secondary batteries arranged in one direction, although not specifically described in detail. Each battery 5 is provided with

electrode terminals

6A and 6B. The electrode terminal 6A is a positive electrode terminal, and the electrode terminal 6B is a positive electrode terminal.

Further, the battery pack 1 includes

terminal connection units

7A and 7B for connecting the

connector terminals

4A and 4B and the

electrode terminals

6A and 6B, respectively. The

terminal connection units

7A and 7B have a terminal connection structure according to an embodiment of the present invention. Hereinafter, a case where the terminal connection structure according to one embodiment of the present invention is applied to the terminal connection unit 7A will be described as an example.

FIG. 2 is a perspective view showing a terminal connection structure according to an embodiment. FIG. 3 is a cross-sectional view of the terminal connection structure shown in FIG. 2 and 3, the terminal connection structure 10 of the present embodiment includes a terminal block 12 (first terminal block) to which a bolt 11 (first bolt) is fixed and a bolt 13 (second bolt) fixed. A terminal block 14 (second terminal block), an L-shaped bus bar 15 that connects the bolt 11 and the bolt 13, and a nut 16 that is screwed to the bolt 11 and tightens one end of the bus bar 15 to the terminal block 12 ( A first nut) and a nut 17 (second nut) that is screwed to the bolt 13 and fastens the other end of the bus bar 15 to the terminal block 14.

The

bolts

11 and 13 and the nuts 16 and 17 are made of iron. The bus bar 15 is formed of a conductive member such as aluminum, copper, or iron. Thereby, the

bolts

11 and 13 are electrically connected via the nut 16, the bus bar 15, and the nut 17.

The axial direction of the bolt 11 and the axial direction of the bolt 13 are different. Specifically, the axial direction of the bolt 13 is perpendicular to the axial direction of the bolt 11. Accordingly, the bus bar 15 has a bent shape that is bent vertically. The bolt 11 is fixed in a state of being embedded in the terminal block 12 so that a part thereof protrudes from the upper surface of the terminal block 12. The bolt 13 is fixed in a state of being embedded in the terminal block 14 so that a part thereof protrudes from the upper surface of the terminal block 14. The nut 16 fastens one end side of the bus bar 15 to the terminal block 12 while being in contact with the bus bar 15. The nut 17 fastens the other end side of the bus bar 15 to the terminal block 14 while being in contact with the bus bar 15.

The bolt 11 is connected to the connector terminal 4A through at least one other bus bar (not shown). The bolt 13 is connected to the electrode terminal 6A via at least one other bus bar (not shown). Other bus bars are in contact with the upper surfaces of the terminal blocks 12 and 14.

As shown in FIG. 3 and FIG. 4A, a hole 18 having a circular cross section through which the bolt 11 is inserted is provided on one end side of the bus bar 15. The outer diameter of the seat surface of the nut 16 is larger than the inner diameter of the hole 18. On the other end side of the bus bar 15, as shown in FIG. 3 and FIG. 4B, there is provided a notch 19 that opens to the other end of the bus bar 15 and through which the bolt 13 is inserted. The bottom surface 19a of the notch 19 has a semicircular cross section. The outer diameter of the seating surface of the nut 17 is equal to the outer diameter of the seating surface of the nut 16.

Thus, since the hole 18 is provided on one end side of the bus bar 15 and the notch 19 is provided on the other end side of the bus bar 15, the contact area between the nut 17 and the bus bar 15 is as follows. The contact area with 15 is smaller. By the way, as shown in FIG. 5, there is a component tolerance between the bolt 13 and the notch 19 of the bus bar 15. At this time, the contact area between the nut 17 and the bus bar 15 varies depending on the positional relationship between the bolt 13 and the notch 19.

Specifically, as shown in FIG. 5A, the necessary contact area between the nut 17 and the bus bar 15 is ensured in a state where the bolt 13 is at a design position spaced from the bottom 19 b of the notch 19 by a predetermined amount. Is done. However, as shown in FIG. 5B, in the state where the bolt 13 is on the open side of the notch 19 with respect to the design position, the contact area between the nut 17 and the bus bar 15 is reduced. A necessary contact area with the bus bar 15 is not ensured. In this case, the contact surface pressure between the nut 17 and the bus bar 15 is increased, and the nut 17 or the bus bar 15 is deformed in a depressed manner, so that the tightening of the bus bar 15 by the nut 17 is loosened. Further, as shown in FIG. 5C, in the state where the bolt 13 is on the bottom 19b side of the notch 19 from the design position, the contact area between the nut 17 and the bus bar 15 increases. The bus bar 15 cannot be assembled to the terminal block 14 depending on the depth.

Therefore, as shown in FIG. 6, the design position of the bolt 13 with respect to the notch portion 19 of the bus bar 15 is the minimum value at which the contact area between the nut 17 and the bus bar 15 does not cause loosening of the tightening of the bus bar 15 by the nut 17. In this way, the first position where the bolt 13 is separated from the bottom 19b of the notch 19 (P position in the figure) and the second position where the bolt 13 contacts the bottom 19b of the notch 19 (Q position in the figure). It is set to an intermediate position.

The contact area between the nut 17 and the bus bar 15 that is the minimum value that does not cause loosening of the bus bar 15 by the nut 17 is appropriately set according to the thickness and material of the bus bar 15, the dimensions of the notch portion 19, and the like.

The intermediate position between the first position and the second position is offset to the open side of the notch 19 from the center G of the virtual circle X virtually formed by the bottom surface 19a of the notch 19 when viewed from the axial direction of the bolt 13. is doing. Specifically, the center E of the bolt 13 when the bolt 13 is at the design position (intermediate position between the first position and the second position) is located closer to the open side of the notch 19 than the center G of the virtual circle X. It is offset by a fixed amount e. The diameter of the virtual circle X is equal to the inner diameter of the hole 18. The bottom surface 19a of the notch 19 forms a half of the virtual circle X.

Accordingly, the bolt 13 has a first position separated from the bottom portion 19b of the notch 19 so that the contact area between the nut 17 and the bus bar 15 becomes a minimum value that does not cause loosening of the tightening of the bus bar 15 by the nut 17, and the notch 19 and the second position where it contacts the bottom 19b.

When the bus bar 15 is assembled to the terminal blocks 12, 14, the bus bar 15 is moved in the axial direction of the bolt 11 (the arrow direction in FIG. 3), so that the bolt 11 is inserted into the hole 18 of the bus bar 15 and the bus bar 15 The bolt 13 is inserted through the notch 19. Then, a nut 16 is screwed into the bolt 11 and one end of the bus bar 15 is fastened to the terminal block 12, and a nut 17 is screwed into the bolt 13 to tighten the other end of the bus bar 15 to the terminal block 14.

FIG. 7 is a cross-sectional view showing an example of a conventional terminal connection structure. In FIG. 7, the terminal connection structure 50 includes an L-shaped bus bar 51 that connects the bolt 11 and the bolt 13. On both end sides of the bus bar 51, holes 52 and 53 having circular cross sections through which the

bolts

11 and 13 are inserted are provided. Other configurations are the same as those of the terminal connection structure 10 described above.

In such a terminal connection structure 50, since the axial direction of the bolt 11 and the axial direction of the bolt 13 are orthogonal, it is impossible to assemble the bus bar 51 to the terminal blocks 12 and 14 from one direction. For this reason, it is necessary to pass the bolt 13 through the hole 53 of the bus bar 51 while rotating the bus bar 51 after passing the bolt 11 through the hole 52 of the bus bar 51. However, in this case, the bus bar 51 cannot be assembled to the terminal blocks 12 and 14 unless the lengths of the

bolts

11 and 13 and the diameters of the

holes

52 and 53 are appropriately designed.

In contrast, in this embodiment, a hole 18 through which the bolt 11 is inserted is provided on one end side of the bus bar 15, and a notch 19 through which the bolt 13 is inserted is provided on the other end side of the bus bar 15. The notch 19 is open to the other end of the bus bar 15. For this reason, when the bus bar 15 is moved in the axial direction of the bolt 11 so that the bolt 11 passes through the hole portion 18, the bolt 13 passes through the notch portion 19. Therefore, the bus bar 15 can be assembled to the terminal blocks 12 and 14 from one direction. Accordingly, when the

bolts

11 and 13 having different axial directions are connected to each other by the bent bus bar 15, the assembling property of the bus bar 15 can be improved.

Further, in the present embodiment, the bolt 13 is the first spaced apart from the bottom portion 19b of the notch portion 19 so that the contact area between the nut 17 and the bus bar 15 becomes a minimum value that does not cause loosening of the tightening of the bus bar 15 by the nut 17. It is arranged between the position and the second position that abuts against the bottom 19 b of the notch 19. For this reason, the range which accept | permits component tolerance in the notch part 19 of the bus-bar 15 can be taken widely. At this time, the first position is a position separated from the bottom portion 19b of the notch portion 19 so that the contact area between the nut 17 and the bus bar 15 becomes a minimum value that does not cause loosening of the tightening of the bus bar 15 by the nut 17. For this reason, the contact area between the nut 17 and the bus bar 15 is always greater than or equal to the minimum value. Therefore, the tightening of the other end side of the bus bar 15 by the nut 17 due to deformation of the nut 17 or the bus bar 15 due to an increase in the contact surface pressure between the nut 17 and the bus bar 15 is prevented. The second position is a position where the bolt 13 contacts the bottom 19 b of the notch 19. This prevents the bus bar 15 from being assembled to the terminal blocks 12 and 14.

Further, in the present embodiment, the intermediate position between the first position and the second position is notch from the center G of the virtual circle X that is virtually formed by the bottom surface 19a of the notch 19 when viewed from the axial direction of the bolt 13. It is offset to the open side of the part 19. Therefore, since the distance from the intermediate position between the first position and the second position to the first position and the second position becomes longer, the range in which the component tolerance is allowed in the notch portion 19 of the bus bar 15 can be further increased.

FIG. 8 is a cross-sectional view showing a part of a terminal connection structure according to another embodiment of the present invention. FIG. 9 is a plan view showing a portion excluding the nut in the terminal connection structure shown in FIG. 8 and 9, one end side of the bus bar 20 is connected to the bolt 13. On one end side of the bus bar 20, a hole 21 having a circular cross section through which the bolt 13 is inserted is provided. The bus bar 20 is connected to the bolt 13 while being superimposed on the bus bar 15. Therefore, the other end side of the bus bar 15 is in contact with the upper surface of the terminal block 14. The bus bar 20 extends in a direction perpendicular to the longitudinal direction of the bus bar 15. The nut 17 tightens the other end side of the bus bar 15 together with the bus bar 20 in contact with the bus bar 20.

In the present embodiment, the nut 17 contacts the bus bar 20 having the hole portion 21 and does not contact the bus bar 15 having the notch portion 19. Therefore, even if the bolt 13 is disposed away from the bottom 19 b of the notch 19, the contact area between the nut 17 and the bus bar 20 is ensured, so that the other end of the bus bar 15 is connected to the terminal via the bus bar 20 by the nut 17. It is securely tightened against the base 14. Thus, even if the bolt 13 is arranged away from the bottom portion 19b of the notch portion 19, there is no particular problem, so that the range in which the component tolerance is allowed in the notch portion 19 of the bus bar 15 can be sufficiently widened.

It should be noted that one aspect of the present invention is not limited to the above embodiment. Subsequently, a modification of the terminal connection structure 10 will be described. In the example shown in FIG. 10, the bolt 13 and the notch 19 are deformed. More specifically, the bolt 13 here has a screwing portion 13a having a diameter C equivalent to the diameter of the bolt 13 shown in FIG. 4, and a diameter D smaller than the diameter C of the screwing portion 13a. A reduced diameter portion 13b. The reduced diameter portion 13b is located closer to the terminal block 14 than the screwing portion 13a. That is, here, the terminal 13 side portion of the bolt 13 is relatively thin. The nut 17 is screwed into the screwing portion 13a.

On the other hand, here, the dimension A (diameter of the semicircle of the bottom surface 19a) of the cutout portion 19 is larger than the diameter D of the reduced diameter portion 13b and smaller than the diameter C of the screwing portion 13a. . That is, here, the notch 19 is made smaller than that in the above embodiment. In the notch portion 19, a relatively thin reduced diameter portion 13 b of the bolt 13 is disposed. According to this example, the contact area between the bus bar 15 and the nut 17 can be increased, and the assembly intersection can be reduced.

On the other hand, the notch 19 can be variously modified as shown in FIG. In the example shown in FIG. 11A, the cutout portion 19 includes a portion 19c extending along the longitudinal direction of the bus bar 15, and a portion 19d extending continuously from the portion 19c in the short direction of the bus bar 15. Therefore, it is formed in an L shape. The extending direction of the portion 19d is, for example, along the surface direction (the direction along the plate surface) of the portion of the bus bar 15 where the hole 18 is formed. For this reason, for example, when the bus bar 15 rotates along the direction when the nut 16 is screwed into the bolt 11 inserted through the hole 18, the bolt 13 is prevented from contacting the inner surface of the notch 19. The

In the example shown in FIG. 11B, the notch 19 is formed in a tapered shape. More specifically, here, the cutout portion 19 includes a bottom portion 19b including a bottom surface 19a having a semicircular cross section, and a tapered portion 19e that expands from the bottom portion 19b toward the end of the bus bar 15. In this case, it becomes easy to arrange the bolt 13 in the notch 19.

In the example shown in (c) of FIG. 11, the entire extending direction of the notch 19 is inclined with respect to the longitudinal direction of the bus bar 15. Thus, according to the shape of the bus bar 15 and the manner of assembly, the extending direction of the notch 19 can be arbitrarily set so that the bolt 13 can be easily disposed in the notch 19.

Further, as shown in FIGS. 12 (a) and 12 (b), the center E of the bolt 13 is positioned with respect to the short direction of the bus bar 15 (the direction in which the notch 19 is passed) in anticipation of a deviation during assembly. It may be offset from the center of the notch 19 by a fixed amount e. In this case, the shift E causes the center E of the bolt 13 to be close to the center of the notch 19, and the reduction of the contact area between the nut 17 and the bus bar 15 can be suppressed. In particular, when the diameter of the seat surface of the nut 17 and the width of the bus bar 15 (dimension in the short direction) are approximately the same, the reduction in the contact area due to the shift in the direction becomes significant. The modified example becomes more effective.

Here, for example, in the above-described embodiment, the axial direction of the bolt 11 and the axial direction of the bolt 13 are orthogonal to each other. However, the shape is not particularly limited, and the axial direction of the bolt 11 and the axial direction of the bolt 13 intersect. If you do. In this case, the bending angle of the bus bar 15 corresponds to the intersection angle between the axial direction of the bolt 11 and the axial direction of the bolt 13. In the example of FIG. 13, the crossing angle between the axial direction of the bolt 11 and the axial direction of the bolt 13 is smaller than 90 °. Accordingly, the bending angle of the bus bar 15 is larger than 90 ° by the difference between the intersection angle and 90 °. In addition, the intersection angle between the axial direction of the bolt 11 and the axial direction of the bolt 13 and the bending angle of the bus bar 15 may be set independently of each other, and various modifications are possible.

Furthermore, as in the example shown in FIG. 14A, a plurality of (two here) notches 19 may be provided for a single bus bar 15 (the same applies to the holes 18). . Further, as in the example shown in FIG. 14 (b), the notch portion 19 is formed with respect to the hole portion 18 along the surface direction (direction along the plate surface) of the portion where the hole portion 18 is provided in the bus bar 15. May be shifted.

More specifically, here, the bus bar 15 includes a portion 15a in which the hole 18 is provided, a portion 15b extending from the portion 15a in a direction intersecting (orthogonal to) the portion 15a, as in the above embodiment, including. The bus bar 15 is formed in an L-shaped plate shape by a portion 15a and a portion 15b. Further, the bus bar 15 includes a portion 15c protruding from the portion 15b along the surface direction of the portion 15a. And the notch part 19 is provided in this part 15c. Thereby, here, the formation position of the notch 19 is shifted with respect to the formation position of the hole 18 along the surface direction of the portion 15a. Thus, the positional relationship between the hole 18 and the notch 19 can be arbitrarily set according to the manner of assembly.

The terminal connection structure 10 of the above embodiment is applied to the

terminal connection units

7A and 7B that connect the

connector terminals

4A and 4B and the

electrode terminals

6A and 6B, respectively. The present invention is not limited to such a terminal connection unit, and any structure that connects terminals in a battery pack can be applied.

A battery pack terminal connection structure is provided that can improve the ease of assembling the bus bar when bolts having different axial directions are connected by a bent bus bar.

DESCRIPTION OF SYMBOLS 1 ... Battery pack, 10 ... Terminal connection structure, 11 ... Bolt (1st bolt), 12 ... Terminal block (1st terminal block), 13 ... Bolt (2nd bolt), 14 ... Terminal block (2nd terminal block) 15 ... Bus bar, 16 ... Nut (first nut), 17 ... Nut (second nut), 18 ... Hole, 19 ... Notch, 19a ... Bottom, 19b ... Bottom, 20 ... Bus bar (other bus bars), 21 ... hole.

Claims

A first terminal block to which a first bolt is fixed;
A second terminal block to which a second bolt having a different axial direction from the first bolt is fixed;
A bent bus bar connecting the first bolt and the second bolt;
A first nut that is screwed into the first bolt and fastens one end of the bus bar to the first terminal block;
A second nut screwed to the second bolt and tightening the other end of the bus bar to the second terminal block;
One end of the bus bar is provided with a hole through which the first bolt is inserted,
The other end of the bus bar is provided with a notch that opens to the other end of the bus bar and through which the second bolt is inserted.
Battery pack terminal connection structure.
The second nut is fastened to the second terminal block with the other end of the bus bar in contact with the bus bar.
The second bolt has a first position spaced from the bottom of the notch so that a contact area between the second nut and the bus bar is a minimum value that does not cause loosening of the bus bar by the second nut. , Disposed between the second position contacting the bottom of the notch,
The battery pack terminal connection structure according to claim 1.
The bottom surface of the notch has a semicircular cross section,
The intermediate position between the first position and the second position is closer to the open side of the notch than the center of a virtual circle virtually formed by the bottom surface of the notch as viewed from the axial direction of the second bolt. Offset,
The battery pack terminal connection structure according to claim 2.
And further comprising another bus bar connected to the second bolt in a state of being superimposed on the bus bar,
The other bus bar is provided with a hole through which the second bolt is inserted,
The second nut is fastened to the second terminal block together with the other bus bar while the other end of the bus bar is in contact with the other bus bar.
The battery pack terminal connection structure according to claim 1.