JP2009277393A - Terminal connection member or terminal connection structure, and battery pack using these - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a terminal connection member in which contact property with the terminal can be retained stably for a long period of time, and space utilization efficiency can be improved. <P>SOLUTION: This is a bus bar 29 which is formed of conductive material, and in which positive electrode terminals 17 and negative electrode terminals 21 between lithium secondary batteries 3 having pillar shaped positive electrode terminals 17 and negative electrode terminals 21 are mutually connected. This is equipped with a plate shaped main body 31 and contact parts 33 installed penetrating through the thickness direction in the face of the main body 31 corresponding to respective positive electrode terminals 17 and the negative electrode terminals 21, in which the inner face shapes of the contact parts 33 are arranged so that its peripheral brim parts go along at least with one part of the cross-sectional shapes of the positive electrode terminals 17 and the negative electrode terminals 21. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a terminal connection member or a terminal connection structure for connecting terminals between single cells having terminals, and an assembled battery obtained by connecting and combining a plurality of single cells using these.

A lithium secondary battery includes, for example, a cylindrical positive electrode terminal and a negative electrode terminal. When the assembled battery is configured by using a plurality of lithium secondary batteries that are single cells, for example, as shown in Patent Document 1, terminals between lithium secondary batteries are connected to each other by a connecting member (bus bar).
Conventionally, the connection between the terminals by the bus bar is performed by contacting the bus bar to the tip of the terminal between the lithium secondary batteries and screwing and fixing the bolt to the terminal through the bus bar from the tip side.

Japanese Patent Laid-Open No. 2002-8605

However, when the bolt is screwed directly to the end of the terminal in this way, the diameter of the cross section of the terminal is limited, so the contact area between the terminal and the bus bar is limited to that range, The contact area cannot be increased. And if the assembled battery is installed inside a moving body (car, motorcycle, ship, train, forklift, etc.), the vibration generated when the moving body is in operation directly acts on the bolt of the cell, For example, if the movement in the rotational direction in which the terminal is loosened by vibration acts on the bolt, the bolt may be loosened. If the bolts are loosened, the contact state between the terminal and bus bar will be poor, so the contact resistance between the terminal and bus bar will increase, and abnormal heat generation may occur between the terminal and bus bar, causing the terminal part to burn out. There is.
Accordingly, there is a possibility that the connection between the single cells cannot be stably maintained for a long time.
Furthermore, since the bus bar and the head of the bolt are present at the tip of the terminal, a corresponding space in the height direction is required. Accordingly, when an assembled battery is used, a dead space other than the battery main body is additionally required, which prevents the assembled battery from being made compact.

  In view of the above problems, the present invention provides a terminal connection member or a terminal connection structure that can stably maintain contactability with a terminal for a long period of time and can improve space utilization efficiency, and an assembled battery using these. For the purpose.

In order to solve the above problems, the present invention employs the following means.
A terminal connecting member according to the present invention is a terminal connecting member formed of a conductive material for connecting the terminals between single cells having columnar terminals, and a plate-shaped main body, A contact portion penetrating in the thickness direction in a plane and provided corresponding to each terminal, and the in-plane shape of the contact portion is at least a part of the cross-sectional shape of the terminal. It is characterized by having a shape along.

According to the present invention, the in-plane shape of the contact portion provided so as to penetrate in the thickness direction in the surface of the main body has a shape in which the peripheral edge portion conforms to at least a part of the cross-sectional shape of the terminal. Therefore, it can be attached so that the peripheral part of a contact part may be located so that the outer surface of a terminal may be followed, and it may contact | adhere. In other words, the terminal connection member can be attached to the terminal such that the contact portion covers the outer surface of the terminal.
Thus, since it is attached along the outer surface of the terminal, the contact between the terminal and the terminal connecting member is increased by increasing the axial length of the terminal that is relatively unrestricted and increasing the thickness of the terminal connecting member. The area can be increased, and the coupling force (frictional force) between the two can be increased.
Further, the structure in which the terminal connecting member is brought into close contact with the terminal can have a degree of freedom, and it is not necessary to use a structure in which a bolt is screwed directly to the terminal as in the prior art. For this reason, for example, vibration generated when a moving body or the like is in operation is less likely to directly act on a structure in which the terminal connection member is in close contact with a terminal of an assembled battery installed inside the moving body or the like. The effect can be reduced.

As a result, the contact resistance between the terminal and the terminal connection member can be stably kept low over a long period of time, so that the terminal connection member has excellent cell performance, for example, excellent input / output of a lithium secondary battery. The connection can be maintained stably for a long time without impairing the characteristics and the large current charge / discharge characteristics.
Further, since the terminal and the terminal connection member are attached so as to overlap in the axial direction, the length in the axial direction is longer than that of the conventional one in which the terminal connection member is disposed on the tip end surface of the terminal. The thickness can be reduced. Accordingly, when the assembled battery is configured, the dead space other than the battery body is reduced, so that the space utilization efficiency can be improved.

  In the above invention, the in-plane shape of the contact portion is the cross-sectional shape of the terminal, and a slit penetrating in the thickness direction from the contact portion to the outer peripheral portion of the main body is provided, and the slit in the main body The fastening member which contacts and separates the part which opposes in the width direction may be provided.

In this way, the in-plane shape of the contact portion is the cross-sectional shape of the terminal, and since the slit penetrating in the thickness direction from the contact portion to the outer peripheral portion of the main body is provided, the contact portion and the slit reach the outer peripheral portion. A continuous space will be formed. When the part facing the slit of the main body is approached by the fastening member, the part of the main body sandwiching this space swings with the opposite position with respect to the slit of the contact portion as a fulcrum. It will move in the opposite direction.
Accordingly, the contact portion can be firmly attached to the terminal by inserting the terminal into the contact portion of the terminal connection member and tightening the fastening member.
In addition, since the fastening member is not in direct contact with the terminal, for example, the influence of vibration of the terminal of the assembled battery installed inside the moving body can be reduced. Thereby, a possibility that a fastening member may loosen can be reduced remarkably.
In addition, it is suitable from the viewpoint of the efficiency of the fastening member that the slit is configured to open in the short direction of the main body.
Moreover, as a fastening member, a volt | bolt and a screw are used, for example.

  In the above invention, the main body may be a divided main body that is divided along a line that connects the intermediate position of the contact portion, and the divided main bodies may be joined by a fastening member.

Thus, since the main body is a divided main body divided along the line connecting the intermediate position of the contact portion, the divided main body is joined with a fastening member so that each contact portion is along the outer peripheral surface of the terminal. By doing so, the terminal connecting member can be attached so as to be in close contact with the terminal. Here, the intermediate portion position means a portion within one third of the central portion of the length in the short direction of the main body. By tightening the fastening member, the contact portion can be firmly attached to the terminal.
Further, since the fastening member is not in direct contact with the terminal, the influence of the vibration of the terminal can be reduced. Thereby, a possibility that a fastening member may loosen can be reduced remarkably.
In addition, as a fastening member, a volt | bolt and a screw are used, for example.

In the above invention, the main body may be plated on the outer surface thereof including one or more of nickel, tin, and gold.
If it does in this way, the contact resistance of a terminal connection member can be reduced further.

  The terminal connection structure according to the present invention includes the terminal connection member and a stop plate that restricts movement of the terminal connection member that is detachably attached to the distal end portion of the terminal in the distal direction. It is characterized by.

As described above, since the stop plate for restricting the movement of the terminal connecting member in the distal direction is attached to the distal end portion of the terminal, for example, the terminal of the assembled battery installed in the moving body having a large vibration is used. The influence of vibration in the axial direction can be suppressed.
Moreover, even if the adhesiveness between the contact portion of the terminal connection member and the terminal is lost, it is possible to prevent the terminal connection member from being detached from the terminal.

In the said invention, it is preferable that the said stop board is a measurement terminal provided in order to measure the electric potential of the said terminal.
If it does in this way, since the measurement terminal which measures an electric potential has the function of a stop plate, the cost of an assembled battery can be reduced compared with providing a stop plate separately.

  In the above invention, the terminal has a shape in which the cross-sectional area gradually decreases toward the unit cell, and the area of the contact portion gradually decreases in the thickness direction toward the unit cell. Also good.

In this way, in the mounted state, the contact portion is pressed by the terminal from the distal end direction, so that the movement of the connecting member in the distal end direction is prevented, for example, installed inside a moving body or the like. The influence of vibration in the axial direction of the terminals of the assembled battery can be further suppressed.
Moreover, even if the adhesion between the contact portion of the terminal connection member and the terminal is lost, it is possible to reliably prevent the terminal connection member from being detached from the terminal.

  A terminal connection structure according to the present invention uses the terminal connection member according to any one of claims 1 to 4, wherein the terminal has a shape in which a cross-sectional area gradually decreases toward the unit cell and the terminal The area of the contact portion is gradually reduced toward the unit cell in the thickness direction.

In this way, the terminal is shaped so that the cross-sectional area gradually decreases toward the unit cell side and the area of the contact portion is gradually decreased toward the unit cell side in the thickness direction, so that the mounted state Then, the contact part is pressed by the terminal from the front end direction. For this reason, since the movement to the front-end | tip direction of a connection member is prevented, the influence of the vibration in the axial direction of the terminal of the assembled battery currently installed in the inside of a moving body etc. can be suppressed, for example.
Moreover, even if the adhesiveness between the contact portion of the terminal connection member and the terminal is lost, it is possible to prevent the terminal connection member from being detached from the terminal.

  Moreover, this invention provides the assembled battery by which the said several cell is connected using the said terminal connection member or the said terminal connection structure.

In this way, since it is connected using a terminal connection member or a terminal connection structure that can be stably connected and maintained for a long time without impairing the performance of the unit cell, the life is long, and the maintenance work is less. For example, an assembled battery installed inside a moving body or the like can be provided.
Moreover, since a highly space-efficient terminal connection member or terminal connection structure is used, a compact assembled battery can be obtained.

The present invention also provides a moving body using the assembled battery.
Thus, since the assembled battery having a long life and less maintenance is used, the mobile body can utilize the power of the assembled battery for a long period of time.
Moreover, since the compact assembled battery is used, the moving body can freely select the installation location of the assembled battery.
Note that the moving body includes a car, a motorcycle, a ship, a train, a forklift, and the like.

According to the present invention, the in-plane shape of the contact portion provided so as to penetrate in the thickness direction in the surface of the main body has a shape in which the peripheral edge portion conforms to at least a part of the cross-sectional shape of the terminal. Therefore, the connection can be stably maintained for a long time without impairing the performance of the unit cell.
Moreover, space utilization efficiency can be improved.

Below, the assembled battery 1 which concerns on one Embodiment of this invention is demonstrated with reference to drawings.
FIG. 1 is a perspective view showing a schematic appearance of the assembled battery 1. FIG. 2 is a plan view showing a state in which the lid 7 forming the upper part of the assembled battery 1 is removed. FIG. 3 is a plan view showing a schematic configuration of the lithium secondary battery (unit cell) 3. FIG. 4 is a partially cutaway front view showing a schematic configuration of the lithium secondary battery 3. FIG. 5 is an XX view of FIG.
The assembled battery 1 is provided with a case 5 having a substantially rectangular parallelepiped shape with an upper part opened to accommodate the lithium secondary battery 3 and a lid 7. In the vicinity of the long side of the lid 7, two substantially rectangular openings are provided, and the battery positive terminal 9 and the battery negative terminal 11 each having a cylindrical shape are provided so as to protrude.

As shown in FIG. 2, the case 5 houses four lithium secondary batteries 3 in a row.
The battery container 13 of the lithium secondary battery 3 has a hollow, substantially rectangular parallelepiped shape with an open upper surface. A battery lid 15 which is a substantially rectangular plate-like body is fixed and attached so as to cover the upper surface.
The battery container 13 and the battery lid 15 are made of, for example, a steel material such as stainless steel, an aluminum-based material, or the like. In addition, the inner surface of the battery container 13 may be in direct contact with the nonaqueous electrolytic solution, but it is also possible to use one that is covered with an insulator such as a modified polyolefin.
Although not shown, the battery container 13 contains a non-aqueous electrolyte containing lithium ions, a positive electrode current collector, and a negative electrode current collector.

The battery lid 15 includes a positive electrode terminal (terminal) 17 connected to the positive electrode current collector, a rupture-type safety valve 19, a negative electrode terminal (terminal) 21 connected to the negative electrode current collector, a sealing plug 23, , Is provided.
The positive electrode terminal 17 and the negative electrode terminal 21 have a cylindrical shape, and are each attached to the battery lid 15 via an insulator 25.
Screw holes 27 are formed on the outer end surfaces of the positive electrode terminal 17 and the negative electrode terminal 21 so as to be substantially the same axis center.
The positive terminal 17 is made of aluminum, for example. For example, nickel plating may be applied to the surface of the outer end portion of the positive electrode terminal 17 in order to reduce the contact resistance. The negative terminal 21 is made of copper, for example.

The safety valve 19 has a thin disk shape and is attached to the center of the battery lid 15.
The safety valve 19 is made of, for example, a metal material such as aluminum. For example, when an internal short circuit occurs in the lithium secondary battery 1 and gas is generated and the internal pressure rapidly increases, the safety valve 29 is ruptured and opened. Thereby, since an internal pressure falls, the situation where the whole battery container 13 bursts can be prevented.

  The sealing plug 23 is attached to the corner of the battery lid 15. The sealing plug 23 is configured to be sealed with a bolt or the like, for example, with an O-ring interposed therebetween.

The assembled battery 1 shown in FIG. 2 has a configuration in which four lithium secondary batteries 3 are connected in series. The assembled battery 1 is installed such that the battery lid 15 of the lithium secondary battery 3 is located on the upper surface.
The case 5 has a partition in which the lithium secondary batteries 3 are stored at predetermined positions with a space therebetween. The adjacent lithium secondary battery 3 is lined upside down with respect to one lithium secondary battery 3.
Thereby, the positive electrode terminal 17 (negative electrode terminal 21) of one lithium secondary battery 3 and the negative electrode terminal 21 (positive electrode terminal 17) of the adjacent lithium secondary battery 3 can be connected as the shortest distance.
The adjacent positive electrode terminal 17 and negative electrode terminal 21 are sequentially connected by a bus bar (terminal connection member) 29, whereby the lithium secondary batteries 3 are connected in series.

As shown in FIGS. 6 and 7, the bus bar 29 includes a main body 31 that is a substantially rectangular plate-shaped body, a pair of contact portions 33 formed on the main body 31, and a pair formed on the main body 31. , A pair of screw holes (fastening members) 37 formed in the main body 31, and fastening bolts (fastening members) 39.
The main body 31 is made of a conductive member, for example, copper. The contact portion 33 and the slit 35 are formed in the surface of the main body 31 so as to penetrate in the thickness direction.
The surface of the main body 31 is plated with nickel over the entire surface in order to reduce the contact resistance. This plating is not limited to nickel plating, and may be plated with a metal containing nickel, tin, gold, or the like, such as tin plating or gold plating.
The contact portion 33 penetrating in the thickness direction in the surface of the main body 31 is formed close to the short side portion of the main body.
The in-plane shape of the contact portion 33 is substantially circular so as to follow the cross-sectional shapes of the positive electrode terminal 17 and the negative electrode terminal 21. A surface in the thickness direction of the contact portion 33 becomes a contact surface 41 that contacts the positive electrode terminal 17 and the negative electrode terminal 21.

The slit 35 is formed substantially in parallel with the long side portion from the short side portion of the main body 31 to the contact portion 33. Therefore, the slit 35 divides both end portions of the main body 31 into a part A and a part B.
The screw hole 37 intersects the slit 35 at a substantially intermediate position in the thickness direction of the main body 31 and at a midway position in the longitudinal direction of the slit 35, that is, substantially parallel to the short side portion of the main body 31. It is formed over the entire width of the main body 31.
The fastening bolt 39 is screwed into the screw hole 37 and has a length that passes through the portion A and reaches a substantially intermediate position of the portion B.

The positive terminal 17 and the negative terminal 21 at the ends of the positive terminal 17 and the negative terminal 21 sequentially connected in series are connected to the battery positive terminal 9 and the battery negative terminal 11 by end bus bars 43, respectively.
The engaging portion of the end bus bar 43 with the positive electrode terminal 17 and the negative electrode terminal 21 has a configuration substantially equivalent to that of the bus bar 29.

Conductive wires 45 for measuring potentials are connected to the upper ends of all the positive terminals 17 and the negative terminals 21. A voltage terminal (stop plate, measurement terminal) 47 whose end is substantially donut-shaped is connected to the conducting wire 45. The voltage terminal 47 is attached by screwing a bolt 49 inserted into the donut-shaped space into the screw hole 27.
The positive electrode terminal 17, the negative electrode terminal 21, the bus bar 29, the voltage terminal 47, and the bolt 49 constitute the terminal connection structure of the present invention.
These conducting wires 45 are connected to a monitoring circuit (not shown) provided in the monitoring unit 51 at the end. The monitoring circuit monitors the potential at each terminal and the temperature of each battery container 13, and if they are abnormal, takes measures such as giving an alarm or stopping the operation.
Moreover, although the case where the lithium secondary battery 3 was connected in series was described in this embodiment, it is good also as connecting a lithium secondary battery 3 in parallel with the same connection method, and comprising an assembled battery.

The assembly of the assembled battery 1 according to the present embodiment described above will be described.
Four lithium secondary batteries 3 are installed at predetermined positions of the case 5 so that the adjacent lithium secondary batteries 3 are reversed.
Next, as shown in FIG. 2, a predetermined positive terminal 17 and a negative terminal 21 are connected by a bus bar 29.

That is, first, the bus bar 29 is installed from above so that the positive electrode terminal 17 and the negative electrode terminal 21 are located inside the contact portion 33. In other words, the contact portion 33 covers the outer surfaces of the positive electrode terminal 17 and the negative electrode terminal 21.
Since both the outer surface of the positive electrode terminal 17 and the negative electrode terminal 21 and the contact surface 41 of the contact portion 33 have a circular cross section, they contact almost the entire surface.
In this state, when the fastening bolt 39 is screwed into the screw hole 37, the part A and the part B separated by the slit 35 approach each other.
When the part A and the part B come close to each other at the screw hole 37, the part A and the part B swing around the point C that is farthest from the short side of the main body 31 in the contact part 33, so The contact surface 41 of the portion 33 moves toward the inside thereof.

Thereby, the contact surface 41 is strongly pressed against the outer peripheral surfaces of the positive electrode terminal 17 and the negative electrode terminal 21, so that the bus bar 29 can be firmly adhered to the positive electrode terminal 17 and the negative electrode terminal 21.
Thus, since the contact part 33 of the bus bar 29 is attached along the outer surface of the positive electrode terminal 17 and the negative electrode terminal 21, the axial direction length of the terminal which is not comparatively restricted by the space utilization efficiency of the assembled battery 1 is set. The area of the contact surface 41 can be increased by increasing the thickness of the bus bar 29 as shown in FIG. 8, and the coupling force (frictional force) between the terminal and the contact surface 41 is increased. be able to.
Further, since the fastening bolt 39 is not in direct contact with the positive electrode terminal 17 and the negative electrode terminal 21, the influence of vibrations of the positive electrode terminal 17 and the negative electrode terminal 21 of the assembled battery 1 installed inside a moving body or the like is reduced. Can do. Thereby, a possibility that a fastening member may loosen can be reduced remarkably.

  As a result, the contact resistance between the positive electrode terminal 17 and the negative electrode terminal 21 and the bus bar 29 can be stably kept low over a long period of time, so that the bus bar 29 has excellent input / output characteristics of the lithium secondary battery 3. The connection can be maintained stably for a long period of time without impairing the large current charge / discharge characteristics.

Further, since the positive electrode terminal 17 and the negative electrode terminal 21 and the bus bar 29 are attached so as to overlap with each other in the axial direction, the bus bar 29 is compared to the conventional one in which the bus bar 29 is disposed on the upper end surfaces of the positive electrode terminal 17 and the negative electrode terminal 21. Thus, the axial length can be reduced by the thickness of the bus bar 29. Accordingly, when the assembled battery 1 is configured, the dead space other than the main body of the lithium secondary battery 3 is reduced, so that the space utilization efficiency can be improved.
That is, the assembled battery 1 can be formed compactly.

Then, the end bus bar 43 is connected to the positive terminal 17 and the negative terminal 21 at the ends of the positive terminal 17 and the negative terminal 21 connected in series in the same manner as the bus bar 29, and the battery positive terminal 9 and the battery negative terminal are respectively connected. 11 is connected.
Then, the conducting wire 45 for measuring the potential is connected to the upper ends of all the positive terminals 17 and the negative terminals 21. The conducting wire 45 is attached by screwing a bolt 49 inserted into the space of the voltage terminal 47 into the screw hole 27.

Since the voltage terminal 47 is larger than the end faces of the positive electrode terminal 17 and the negative electrode terminal 21, the movement of the bus bar 29 in the axial direction can be suppressed. Thereby, the influence of the vibration in the axial direction of the positive electrode terminal 17 and the negative electrode terminal 21 of the assembled battery 1 installed in the inside of a mobile body etc. can be suppressed.
For example, even if the fastening bolt 39 is loosened and the adhesion between the contact portion 33 of the bus bar 29 and the positive electrode terminal 17 and the negative electrode terminal 21 is lost, the bus bar 29 is detached from the positive electrode terminal 17 and the negative electrode terminal 21. Fear can be prevented.
Thus, the voltage terminal 47 may not be used as the stop plate, but another appropriate shape may be used.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the specific structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

  For example, in this embodiment, the cross-sectional shape of the positive electrode terminal 17 and the negative electrode terminal 21 and the in-plane shape of the contact portion are circular, but the present invention is not limited to this. The cross-sectional shape of the positive electrode terminal 17 and the negative electrode terminal 21 and the in-plane shape of the contact portion may be substantially the same. For example, this shape may be various shapes such as an ellipse and a polygon.

Further, as shown in FIG. 9, the slit 35 of FIG. 6 is made to pass through in the longitudinal direction, that is, the main body 31 is divided along a line connecting the intermediate position of the contact portion 33, and the divided main body 31A is divided. , 31B may be formed. Here, the intermediate position refers to a portion within one third of the central length of the main body 31 in the short direction.
The contact portion 33 is also divided into divided contact portions 33A and 33B.
The split main bodies 31 </ b> A and 31 </ b> B are arranged to face each other, and the split contact portions 33 </ b> A and 33 </ b> B are joined by the fastening bolts 39 so as to be along the outer surfaces of the positive electrode terminal 17 and the negative electrode terminal 21. Thereby, the divided contact portions 33A and 33B can be attached so as to be in close contact with the positive electrode terminal 17 and the negative electrode terminal 21. By tightening the fastening bolt 39, the divided contact portions 33 </ b> A and 33 </ b> B can be firmly attached to the positive terminal 17 and the negative terminal 21.
Further, since the fastening bolt 39 is not in direct contact with the positive electrode terminal 17 and the negative electrode terminal 21, the influence of vibrations of the positive electrode terminal 17 and the negative electrode terminal 21 of the assembled battery 1 installed inside a moving body or the like is reduced. Can do. Thereby, the possibility that the fastening bolt 39 is loosened can be remarkably reduced.
In this case, in the mounted state, it is preferable to provide a gap in the divided main bodies 31A and 31B as shown in FIG.
Further, in this case, the divided main bodies 31A and 31B can be easily attached to the positive terminal 17 and the negative terminal 21 rather than the configuration as shown in FIG.
That is, in the case of the configuration of FIG. 6, if the cross section of the contact surface 41 of the contact portion 33 of the bus bar 29 is slightly larger than the cross section of the outer surface of the positive electrode terminal 17 and the negative electrode terminal 21, the mounting is good. However, in this embodiment, the cross section of the contact surface 41 of the divided main bodies 31A and 31B is changed to the positions of the positive electrode terminal 17 and the negative electrode terminal 21. As long as the cross section of the outer surface is made larger, the split main bodies 31A and 31B can be easily attached to the positive terminal 17 and the negative terminal 21 even if the processing accuracy is low, and the contact property can be stably extended over a long period of time. Can be maintained for a long time.

Further, as shown in FIG. 10, the outer shape of the positive electrode terminal 17 and the negative electrode terminal 21 is made downward, that is, the cross-sectional area gradually decreases toward the battery lid 15 side, and the area of the contact portion 33 is thick. It may be gradually decreased downward in the vertical direction, that is, toward the battery lid 15 side.
If it carries out like this, in the mounting state, the contact part 33 will be pressed by the positive electrode terminal 17 and the negative electrode terminal 21 from the upper direction. For this reason, since the upward movement of the bus bar 29 is strongly restricted, it is possible to suppress the influence of vibration in the axial direction of the positive electrode terminal 17 and the negative electrode terminal 21 of the assembled battery 1 installed inside the moving body or the like. it can.
Further, even if the adhesion between the contact portion 33 of the bus bar 29 and the positive electrode terminal 17 and the negative electrode terminal 21 is lost, it is possible to prevent the bus bar 29 from being detached from the positive electrode terminal 17 and the negative electrode terminal 21.

  Further, the tightening bolt 39 is screwed into the screw hole 37 so that the position of the point C serving as a fulcrum when the part A and the part B separated by the slit 35 swing close to each other does not vary. In addition, for example, as shown in FIG. 11, a cut may be provided at the position of the point C of the contact portion 33.

Further, as shown in FIG. 11, in the inner portion of the contact portion 33, for example, a notch 55 is provided so as to conform to the shape of the contact portion 33, and portions A and B at both ends of the body 31 are provided. The thickness of the main body 31 in the short side direction may be increased from the center side of the contact portion 33 to the end side in the long side direction of the main body 31.
In this way, since the thinnest part of each of the thicknesses of the part A and the part B can be secured about one third of the entire circumference of the contact part 33, there is only one thinnest part as in the configuration of FIG. Compared to the case where there is no load, the load acting on the portion A and the portion B approaches substantially uniformly within the range of the thinnest portion regardless of the position. Thereby, the spring property of the part A and the part B improves, and the behavior with respect to the fastening of the fastening bolt 39 is performed smoothly.
Thereby, mounting and adjustment of the bus bar 29 can be easily performed.

It is a perspective view showing the outline appearance of an assembled battery concerning one embodiment of the present invention. It is a top view which shows the state which removed the cover which forms the upper part of the assembled battery which concerns on one Embodiment of this invention. It is a top view which shows schematic structure of the lithium secondary battery which concerns on one Embodiment of this invention. It is the front view which fractured | ruptured a part which shows schematic structure of the lithium secondary battery which concerns on one Embodiment of this invention. FIG. 3 is an XX view of FIG. 2. It is a top view of the bus bar which concerns on one Embodiment of this invention. It is a front view of the bus bar concerning one embodiment of the present invention. It is a front view which shows another aspect of the bus bar which concerns on one Embodiment of this invention. It is a top view which shows another aspect of the bus bar which concerns on one Embodiment of this invention. It is a front view which shows another aspect of the bus bar which concerns on one Embodiment of this invention. It is a top view which shows another aspect of the bus bar which concerns on one Embodiment of this invention.

Explanation of symbols

1 assembled battery 3 lithium secondary battery 13 battery container 17 positive electrode terminal 21 negative electrode terminal 23 sealing plug 29 bus bar 31 main body 31A, 31B split main body 33 contact part 33A, 33B split contact part 35 slit 37 screw hole 39 tightening bolt 47 voltage Terminal A, B part C point

Claims (10)

A terminal connecting member formed of a conductive material for connecting the terminals between single cells having columnar terminals,
A plate-shaped body,
A contact portion that penetrates in the thickness direction in the surface of the main body and is provided corresponding to each terminal,
An in-plane shape of the contact portion is a terminal connecting member characterized in that a peripheral portion thereof has a shape along at least a part of a cross-sectional shape of the terminal. The in-plane shape of the contact portion is the cross-sectional shape of the terminal,
A slit penetrating in the thickness direction from the contact portion to the outer peripheral portion of the main body is provided,
The terminal connection member according to claim 1, further comprising a fastening member that contacts and separates a portion of the main body facing the slit in the width direction.   The said main body is made into the division | segmentation main body divided | segmented along the line | wire which connects the intermediate part position of the said contact part, and it can enable joining between these division | segmentation main bodies with a fastening member. Terminal connection member.   The said main body is plated with any one or more metals of nickel, tin, or gold | metal | money on the outer surface, The any one of Claims 1-3 characterized by the above-mentioned. Terminal connection member. The terminal connection member according to any one of claims 1 to 4,
A terminal connection structure comprising: a stop plate that restricts movement of the terminal connection member, which is detachably attached to the distal end portion of the terminal, in the distal direction.   The terminal connection structure according to claim 5, wherein the stop plate is a measurement terminal provided to measure the potential of the terminal.   The terminal is shaped so that the cross-sectional area gradually decreases toward the unit cell, and the area of the contact portion is gradually decreased toward the unit cell in the thickness direction. The terminal connection structure according to claim 5 or 6. Using the terminal connection member according to any one of claims 1 to 4,
The terminal is shaped so that the cross-sectional area gradually decreases toward the unit cell, and the area of the contact portion is gradually decreased toward the unit cell in the thickness direction. Terminal connection structure.   The plurality of single cells are connected using the terminal connection member according to any one of claims 1 to 4 or the terminal connection structure according to any one of claims 5 to 8. Assembled battery.   A moving body using the assembled battery according to claim 9.

Images