JP6326515B2 - Battery pack bus bar and battery pack - Google Patents

Description

  The present invention relates to an assembled battery bus bar and an assembled battery.

In an assembled battery including a plurality of secondary batteries such as lithium ion secondary batteries, the positive and negative electrodes of adjacent secondary batteries are connected by a metal connecting member called a bus bar.
The bus bar is a flat plate member made of metal such as aluminum, copper, or iron, and is assembled to the positive and negative electrodes of the secondary battery by joining such as laser welding or ultrasonic welding, or using a fastening member.
Each secondary battery constituting the assembled battery is not securely fixed to the support member in a stationary state, and the relative distance between the secondary battery cells is reduced due to vibration during assembly work or transportation. Change. Also, the relative distance between the secondary batteries changes due to the thermal expansion of the bus bars due to energization. For this reason, there is a concern that stress is generated in the positive and negative electrodes of the bus bar or the secondary battery, resulting in fatigue failure.

  In order to relieve the stress generated in the bus bar or the secondary battery, a stress relief part protruding in a U shape is formed in the middle part in the length direction of the bus bar by bending the flat plate perpendicular to the thickness direction by pressing. It has been known. In this structure, when the bus bar is thermally expanded, the stress relieving portion is deformed to reduce the load transmitted to the positive and negative electrodes of the secondary battery. In addition, in such a structure, there is also a structure in which the stress relaxation portion formed in a U shape is formed as a twisted portion twisted about 90 ° with respect to the thickness direction of the flat plate (see, for example, Patent Document 1). ).

Japanese Patent Publication No. 2007-73266

  In the structure in which a flat plate is bent in a direction perpendicular to the thickness direction to form a U-shaped stress relief portion as in Patent Document 1, the thickness direction and the direction in which the U-shaped opening is expanded or reduced The stress can be relaxed with respect to the load. However, for a load applied in a direction perpendicular to the thickness direction, there is almost no effect of relaxing the stress. Even when the stress relaxation portion is formed as a twisted portion twisted about 90 ° with respect to the thickness direction of the flat plate, the rigidity of the twisted portion is large, so basically the same as the bus bar without the twisted portion. Yes, it is not possible to expect an effect of relaxing the stress with respect to a load applied in a direction perpendicular to the thickness direction.

According to the first aspect of the present invention, the assembled battery bus bar includes a plurality of rectangular energy storage elements each having a positive electrode and a negative electrode provided on one surface, and the positive electrode and the negative electrode of the adjacent energy storage elements. A battery pack bus bar for connecting the positive electrode and the negative electrode facing each other of the battery pack arranged in a row so as to face each other,
A first mounting surface connected to one of the positive electrode or the negative electrode, a second mounting surface connected to the other of the positive electrode or the negative electrode and parallel to the first mounting surface, and the first mounting A first rising surface rising from a surface and a second rising surface rising from the second mounting surface, and the first rising surface and the second rising surface are connected via a connecting surface, and the one surface The direction parallel to the storage element and perpendicular to the arrangement direction of the storage elements is defined as the X direction, the direction parallel to the one surface and perpendicular to the X direction is defined as the Y direction, and the direction perpendicular to the X direction and the Y direction is defined as the Z direction In this case, the first mounting surface and the second mounting surface are arranged in parallel to the XY plane, and the first rising surface is parallel or inclined to the YZ plane from a side portion on one end side in the X direction of the first mounting surface. And the second rise is A cross-section U in which a surface is arranged parallel or inclined to the YZ plane from a side portion on the same side as the first mounting surface in the X direction of the second mounting surface, and the connecting surface is bent in a direction intersecting the Y direction. has a recess-shaped, said first curved portion or inclined portion between the first mounting surface and the first rising surface is formed, between the second mounting surface and the second raised surface A second curved portion or an inclined portion is formed.
According to a second aspect of the present invention, in the first aspect, a third curved portion or an inclined portion is formed between the first rising surface and the connecting surface, and the second rising surface and the connecting surface. It is preferable that the 4th curved part or the inclination part is formed between these .
According to a third aspect of the present invention, in the first aspect, it is preferable that the connecting surface has an intermediate portion arranged in parallel to the XZ plane.
According to a fourth aspect of the present invention, in the aspect according to any one of the first to third aspects, the plate-like member is made of a metal material in which portions forming the first attachment surface and the second attachment surface are different. It is preferable that the clad material is formed of a dissimilar metal joining surface on any of the first rising surface, the second rising surface, and the connecting surface.
According to a fifth aspect of the present invention, in the fourth aspect, the joining surface of the clad material is provided in a region other than the curved region or the bent region of the plate-like member. preferable.
According to a sixth aspect of the present invention, in the fourth aspect, it is preferable that the first mounting surface is formed of an aluminum-based metal and the second mounting surface is formed of a copper-based metal.

  According to the present invention, the bus bar can be deformed in three-dimensionally different directions, and exhibits a stress relaxation effect with respect to a load from any direction.

1 is an external perspective view of an embodiment of an assembled battery according to the present invention. FIG. 2 is an exploded perspective view of the assembled battery illustrated in FIG. 1. The external appearance perspective view of one Embodiment of the assembled battery bus bar shown in FIG. The expanded view before the press work of the assembled battery bus bar shown in FIG. The external appearance perspective view of Embodiment 2 of the bus bar for assembled batteries of this invention. FIG. 6 is a development view of the assembled battery bus bar illustrated in FIG. 5 before press working. The external appearance perspective view of Embodiment 3 of the bus bar for assembled batteries of this invention. The external appearance perspective view of Embodiment 4 of the bus bar for assembled batteries of this invention. The external appearance perspective view of Embodiment 5 of the bus bar for assembled batteries of this invention. The external appearance perspective view of Embodiment 6 of the bus bar for assembled batteries of this invention. The external appearance perspective view of Embodiment 7 of the bus bar for assembled batteries of this invention. The external appearance perspective view of Embodiment 8 of the bus bar for assembled batteries of this invention. The external appearance perspective view of Embodiment 9 of the bus bar for assembled batteries of this invention. The external appearance perspective view of Embodiment 10 of the bus bar for assembled batteries of this invention. The external appearance perspective view of Embodiment 11 of the bus bar for assembled batteries of this invention. The external appearance perspective view of Embodiment 12 of the bus bar for assembled batteries of this invention. The external appearance perspective view of Embodiment 13 of the bus bar for assembled batteries of this invention. The external appearance perspective view of Embodiment 14 of the bus bar for assembled batteries of this invention.

--Embodiment 1--
[Battery structure]
Hereinafter, an embodiment of an assembled battery bus bar and an assembled battery according to the present invention will be described with reference to the drawings.
FIG. 1 is an external perspective view of an embodiment of an assembled battery according to the present invention, and FIG. 2 is an exploded perspective view of the assembled battery shown in FIG.
As shown in FIG. 1, the assembled battery 1 has a structure in which a large number of single cells 2 are fixed by a pair of end plates 4 and a pair of side plates 5. The single battery 2 is a square secondary battery such as a lithium ion secondary battery.
The rectangular unit cell 2 has a rectangular parallelepiped shape having an upper surface and a lower surface, a pair of planes with a large area and a pair of side surfaces with a small area. The unit cells 2 are arranged in a row so as to face each other with a large area. The holders 3 are arranged between the unit cells 2 and in front of the unit cells 2 at the beginning of the column and behind the unit cells 2 at the end of the column. Is intervening.

The unit cell 2 has a positive electrode 2a and a negative electrode 2b on the upper side, and all have the same size, shape and structure. The adjacent unit cells 2 are arranged with the positive electrode 2a and the negative electrode 2b facing each other, in other words, with the front and back planes alternately reversed. The positive electrode 2a is formed of an aluminum-based metal such as aluminum or an aluminum alloy, and the negative electrode 2b is formed of a copper-based metal such as copper or a copper alloy, for example.
An end plate 4 is disposed in front of the holder 3 at the beginning of the row and behind the holder 3 at the end of the row.
The pair of end plates 4 is made of a metal material, has a substantially rectangular shape, and is provided with openings 4a through which the bolts 6 are inserted at four corners. A pair of side plates 5 is arranged on the side of the cells 2 arranged in a row. Each side plate 5 is a rectangular frame having a passing portion provided at an interval in the vertical direction and a connecting portion for connecting the passing portion. Openings 5 a are formed at the corners of the frame corresponding to the openings 4 a of the end plate 4.

  In the assembled battery 1, the end plate 4 on the front side of the row and the end plate 4 on the rear side of the row are arranged inside the front and rear connecting portions of each side plate 5, and the bolt 6 is connected to the opening 5 a of the side plate 5 and the end It is formed by being inserted into the opening 4a of the plate 4 and fixed by fastening. The bolt 6 is screwed into a screw hole (not shown) formed in the holder 3 or a nut (not shown) is disposed on the back side of the end plate 4 and fastened. Instead of fastening with the bolt 6, it may be fixed with rivets.

An insulating cover 7 is disposed on the upper side of each unit cell 2 so as to surround the positive and negative electrodes 2a and 2b of the unit cells 2 arranged in a row.
The positive electrode 2 a and the negative electrode 2 b of the adjacent unit cells 2 are connected by a bus bar 10. All the unit cells 2 are connected in series by a bus bar 10. An end bus bar 8 is connected to the positive electrode 2 a _{1 of the} cell 2 at the head of the column and the negative electrode 2 b ₁ of the cell 2 at the end of the column. The bus bar 10 or the end bus bar 8 and the positive / negative electrode 2a, 2b are joined by welding such as laser welding or ultrasonic welding. It is good also as a structure made into the connection by screw fastening irrespective of welding.

The bus bars 10 all have the same shape and structure. The end bus bar 8 has a mounting surface connected to one of the positive / negative electrode 2a, 2b of the unit cell 2, and a screw fastening through hole is provided at the end opposite to the mounting surface. .
The present invention is characterized by the structure of the bus bar 10, and an embodiment of the bus bar 10 will be described below.

FIG. 3 is an external perspective view of one embodiment of the assembled battery bus bar shown in FIG. 1.
The bus bar 10 is formed by pressing one sheet metal made of an aluminum metal such as aluminum or aluminum alloy, a copper metal such as copper or copper alloy, or a metal such as iron. In the following description, the X direction, the Y direction perpendicular to the X direction, and the Z direction perpendicular to the X direction and the Y direction are as illustrated.
The bus bar 10 includes a first mounting surface 11 connected to one of the positive and negative electrodes 2a and 2b, a second mounting surface 12 connected to the other electrode, and a first rising surface 13 rising from the first mounting surface 11. The second rising surface 14 rising from the second mounting surface 12, and the connecting surface 15 connecting the first rising surface 13 and the second rising surface 14 are provided.

The first mounting surface 11 and the second mounting surface 12 are parallel to the XY plane. Further, the first mounting surface 11 and the second mounting surface 12 are disposed at substantially the same position in the Z direction. The first mounting surface 11 has side portions 11a and 11b parallel to the Y direction, and the second mounting surface 12 has side portions 12a and 12b parallel to the Y direction.
One side 11a of the first mounting surface 11 is exposed to the outside, and the first rising surface 13 is connected to the other side 11b. One side 12a of the second mounting surface 12 is exposed to the outside, and the second rising surface 14 is connected to the other side 12b.
In other words, the first rising surface 13 and the second rising surface 14 are provided on the side portion 11b of the first mounting surface 13 and the side portion 12b of the second mounting surface 14 opposite to the side portion 11b.

  The first rising surface 13 is bent at a substantially right angle with respect to the first mounting surface 11. That is, they are arranged substantially parallel to the YZ plane. An arcuate curved portion 13 a is formed at a connection portion between the first rising surface 13 and the side portion 11 b of the first mounting surface 11. The second rising surface 14 is bent at a substantially right angle with respect to the second mounting surface 12. That is, they are arranged substantially parallel to the YZ plane. An arcuate curved portion 14 a is formed at a connection portion between the second rising surface 14 and the side portion 12 b of the second mounting surface 12.

The first rising surface 13 and the second rising surface 14 are connected by a connecting surface 15. The connecting surface 15 is disposed substantially perpendicular to the first rising surface 13 and the second rising surface 14. That is, the connecting surface 15 is disposed substantially parallel to the XZ plane.
An arcuate curved portion 15 a is formed at the connecting portion of the connecting surface 15 with the first rising surface 13, and an arcuate curved portion 15 b is formed at the connecting portion of the connecting surface 15 with the second rising surface 14. Is formed. The height (width in the Z direction) of the connecting surface 15 is approximately the length obtained by subtracting the height of the curved portion 13a from the height (width in the Z direction) of the first rising surface 13. 2 The length obtained by subtracting the height of the curved portion 14a from the height of the rising surface 14 (the width in the Z direction).

Since the first mounting surface 11 and the second mounting surface 12 are arranged perpendicular to the Z direction, they are easily deformed in the Z direction. Since the first rising surface 13 and the second rising surface 14 are arranged perpendicular to the X direction, they are easily deformed in the X direction. Since the connecting surface 15 is arranged perpendicular to the Y direction, it is easy to deform in the Y direction.
Therefore, the bus bar 10 having the above structure can obtain a stress relaxation effect with respect to a load from any direction three-dimensionally.

FIG. 4 is a developed view of the assembled battery bus bar shown in FIG. 3 before press working. Hereinafter, a method for manufacturing the bus bar 10 will be described with reference to FIG.
The bus bar 10A before processing has a U-shape in which a pair of parallel mounting surfaces 11 and 12 are connected on one side. A rectangular flat base material is punched out by press working to form the shape shown in the figure.
By bending, the base side of the first mounting surface 11 is curved to form a curved portion 13a. Next, the base side of the second mounting surface 12 is bent in the direction opposite to the bending portion 13a side to form the bending portion 14a. By this processing, the first rising surface 13, the connecting surface 15, and the second rising surface 14 rise linearly, the first mounting surface 11 on one surface side, and the second mounting surface 12 on the other surface side are substantially vertical. A bent member is formed.

The connecting portion of the connecting surface 15 with the first rising surface 13 is curved by pressing to form a curved portion 15a. Further, the connecting portion of the connecting surface 15 with the second rising surface 14 is bent in the direction opposite to the bending portion 15a side by press working to form the bending portion 15b.
Thereby, the bus bar 10 shown in FIG. 3 is produced.

According to the one embodiment, the following effects are obtained.
(1) The first mounting surface 11 and the second mounting surface 12 of the bus bar 10 are arranged perpendicular to the Z direction and are easily deformed in the Z direction. The first rising surface 13 and the second rising surface 14 of the bus bar 10 are arranged perpendicular to the X direction and are easily deformed in the X direction. The connecting surface 15 of the bus bar 10 is arranged perpendicular to the Y direction and is easily deformed in the Y direction. Therefore, the bus bar 10 can obtain a stress relaxation effect for a load from any direction three-dimensionally.

(2) The first rising surface 13 of the bus bar 10 is formed so as to rise substantially perpendicularly to one side portion 11 b of the first mounting surface 11, and the second rising surface 14 of the bus bar 10 is one of the second mounting surfaces 12. It is formed to rise substantially perpendicular to the side portion 12b. Therefore, the first rising surface 13 and the second rising surface 14 do not protrude to the outside of the side surface of the unit cell 2 with the bus bar 10 attached to the positive / negative electrode 2a, 2b of the unit cell 2. The width of the battery 1 does not increase.

(3) The connecting surface 15 of the bus bar 10 is disposed substantially perpendicular to the first rising surface 13 and the second rising surface 14. For this reason, the space | interval of the 1st attachment surface 11 of the bus bar 10 and the 2nd attachment surface 12 can be made small. Thereby, the space | interval of the positive / negative electrode 2a, 2b of the adjacent cell 2 can be made small, and it becomes possible to reduce the assembled battery 1 in size.

--Embodiment 2--
FIG. 5 is an external perspective view of Embodiment 2 of the battery pack bus bar of the present invention.
The shape and structure of the bus bar 20 shown in the second embodiment are the same as the bus bar 10 of the first embodiment. The difference between the bus bar 20 of the second embodiment and the bus bar 10 of the first embodiment is that the bus bar 20 is formed of a clad material.
The first attachment surface 21, the first rising surface 23, and the first connecting surface 25 are made of, for example, the same aluminum-based metal as the positive electrode 2 a of the unit cell 2. The second mounting surface 22, the second rising surface 24, and the second connecting surface 26 are made of, for example, the same copper-based metal as the negative electrode 2b of the unit cell 2.

The first connecting surface 25 and the second connecting surface 26 are diffusion-bonded at the joint surface k. In FIG. 5, the bonding surface k is illustrated as a surface perpendicular to the thickness direction, but when the plate thickness is thin and the bonding force is insufficient, the bonding surface k is inclined or stepped, You may make it the combination of a convex part and a recessed part.
The first rising surface 23 is bent at a substantially right angle with respect to the first mounting surface 21 via the curved portion 23a. In other words, the first rising surface 23 is disposed substantially parallel to the YZ plane. The second rising surface 24 is bent at a substantially right angle with respect to the second mounting surface 22 via the curved portion 24b. In other words, the second rising surface 24 is disposed substantially parallel to the YZ plane.

The first connecting surface 25 is disposed substantially perpendicular to the first rising surface 23 via the curved portion 25a. That is, the first connecting surface 25 is disposed substantially parallel to the XZ plane.
The second connecting surface 26 is disposed substantially perpendicular to the second rising surface 24 via the curved portion 26a. That is, the second connecting surface 26 is disposed substantially parallel to the XZ plane. The first connecting surface 25 and the second connecting surface 26 are coupled so as to be in a straight line.
The height (width in the Z direction) of the first connecting surface 25 is approximately the length obtained by subtracting the height of the curved portion 23a from the height (width in the Z direction) of the first rising surface 23. The height (width in the Z direction) of the surface 26 is approximately the length obtained by subtracting the height of the curved portion 24b from the height (width in the Z direction) of the second rising surface 24.

FIG. 6 is a developed view of the assembled battery bus bar shown in FIG. 5 before press working. Hereinafter, a method for manufacturing the bus bar 10 will be described with reference to FIG.
The bus bar 20A before processing is a flat clad material in which a dissimilar metal is bonded to the first connecting surface 25 and the second connecting surface 26 at the joint surface k. The vicinity of the joint surface k in the first joint surface 25 and the vicinity of the joint surface k in the second joint surface 26 are dissimilar metal mixed regions 29 in which different metals are mixed. The bus bar 20A before processing has a U-shape in which the first mounting surface 21 and the second mounting surface 22 are arranged in parallel, and the first mounting surface 21 and the second mounting surface 22 are connected on one side. Have.
A rectangular flat clad material is punched out by press working to form the shape shown in the figure. At this time, as shown in FIG. 6, the joining surface k is punched out so as to be positioned at the approximate center between the first mounting surface 21 and the second mounting surface 22.

  The base portion of the first mounting surface 21 is curved by press working to form a curved portion 23a. Next, the base side of the second mounting surface 22 is bent in the direction opposite to the bending portion 23a to form the bending portion 24a. By this processing, the first rising surface 23, the first connecting surface 25, the second connecting surface 26, and the second rising surface 24 rise linearly, the first mounting surface 21 on one surface side, and the second mounting surface on the other surface side. A member in which the surface 22 is bent substantially vertically is formed.

A curved portion 25a is formed by bending the connecting portion of the first connecting surface 25 with the first rising surface 23 by pressing. Further, the connecting portion with the second rising surface 24 on the second connecting surface 24 side is bent in a direction opposite to the bending portion 25a by pressing to form the bending portion 26a.
Thereby, the bus bar 20 shown in FIG. 5 is produced.

The bus bar 20 of the second embodiment has the same structure as the bus bar 10 of the first embodiment.
Therefore, the bus bar 20 according to the second embodiment has the effects (1) to (3) as with the bus bar 10 according to the first embodiment.
In addition, Embodiment 2 has the following effects.
(4) The first mounting surface 21 is formed of the same material as the positive electrode 2 a of the unit cell 2, and the second mounting surface 22 is formed of the same material as the negative electrode 2 b of the unit cell 2. For this reason, when joining the bus bar 20 and the positive / negative electrodes 2a, 2b of the unit cell 2 by welding or the like, the joining strength can be increased.

(5) In Embodiment 2, the joining surface k of the dissimilar metal is bent at a substantially right angle to the side end face of the first connecting face 25 bent at a substantially right angle to the first rising face 23 and to the second rising face 24. The second connecting surface 26 is located on the boundary surface with the side end surface. When the positive electrode 2a and the negative electrode 2b are welded with a rectangular flat clad material, if the distance between the positive electrode 2a and the negative electrode 2b is narrow, the bonding region overlaps with the heterogeneous metal mixed region 29, resulting in poor bonding Will occur. In order to prevent this, the interval between the positive electrode 2a and the negative electrode 2b must be increased, and the assembled battery 1 becomes larger. In the second embodiment, the first connecting surface 25 and the second connecting surface 26 are arranged in a direction perpendicular to the arrangement direction of the positive / negative electrode 2a, 2b. For this reason, the space | interval of the positive electrode 2a and the negative electrode 2b can be made small, and the assembled battery 1 can be reduced in size.

(6) In Embodiment 2, the dissimilar metal joining surface k is provided in the flat region of the first connecting surface 25 and the flat region of the second connecting surface 26. When the joining surface k of the dissimilar metal is provided in the curved portion or the bent portion, peeling or cracking due to processing occurs in the vicinity of the joining surface k. Therefore, it is possible to prevent peeling or cracking in the vicinity of the joint surface k by providing the joint surface k of the dissimilar metal in a flat region.

  Although the first mounting surface 21 and the second mounting surface 22 are exemplified as a structure formed of the same material as the positive and negative electrodes 2a and 2b of the unit cell 2, the first mounting surface 21 and the second mounting surface 22 are illustrated. The surface 22 is not necessarily the same material as the positive and negative electrodes 2a and 2b, but may be a material that can increase the bonding strength.

--Embodiment 3--
FIG. 7 is an external perspective view of Embodiment 3 of the battery pack bus bar of the present invention.
The difference between the bus bar 30 of the third embodiment and the bus bar 10 of the first embodiment is that the connecting surface 15A is inclined with respect to the XZ plane.
The connecting surface 15 </ b> A is inclined with respect to the first rising surface 13 and the second rising surface 14. The inclination angle is an obtuse angle with respect to the first rising surface 13 and the second rising surface 14.
The connecting surface 15 </ b> A can have an acute angle with respect to the first rising surface 13 and the second rising surface 14 as long as the first mounting surface 11 and the second mounting surface 12 do not overlap.
Other structures are the same as those of the first embodiment, and corresponding members and parts are denoted by the same reference numerals and description thereof is omitted.

Embodiment 3 has the following effects.
(1) The first mounting surface 11 and the second mounting surface 12 of the bus bar 30 are arranged perpendicular to the Z direction and are easily deformed in the Z direction. The first rising surface 13 and the second rising surface 14 of the bus bar 10 are arranged perpendicular to the X direction and are easily deformed in the X direction. The connecting surface 15 of the bus bar 10 is disposed to be inclined with respect to the XZ plane, and is easily deformed in the Y direction and the X direction. Therefore, the bus bar 10 can obtain a stress relaxation effect for a load from any direction three-dimensionally.
Since only the connecting surface 15A is easily deformed in the Y direction, it is preferable that the connecting surface 15A be as close to the XZ plane as possible.

(2) As in the first embodiment, the first rising surface 13 of the bus bar 10 is formed to rise substantially perpendicularly to one side 11b of the first mounting surface 11, and the second rising surface 14 of the bus bar 30 is the second rising surface 14. It is formed so as to rise substantially perpendicularly to one side portion 12 b of the mounting surface 12. Therefore, the first rising surface 13 and the second rising surface 13 do not protrude outward from the side surface of the unit cell 2 in a state where the bus bar 30 is attached to the positive / negative electrode 2a, 2b of the unit cell 2. The width of the assembled battery 1 does not increase.

(3) The connecting surface 15 of the bus bar 30 is inclined with respect to the XZ plane. By adjusting the inclination angle, the degree of freedom of application to the assembled battery in which the interval between the positive and negative electrode 2a, 2b is different is increased. Can do.

--Embodiment 4--
FIG. 8 is an external perspective view of Embodiment 4 of the battery pack bus bar of the present invention.
The bus bar 30A shown in the fourth embodiment is obtained by applying a clad material to the bus bar 30 of the third embodiment as in the second embodiment.
In the bus bar 30A of the fourth embodiment, the first connecting surface 25A and the second connecting surface 26A are inclined with respect to the XZ plane.
In other words, the first connecting surface 25 </ b> A is bent at an obtuse angle with respect to the first rising surface 23, and the second connecting surface 26 </ b> A is bent at an obtuse angle with respect to the second rising surface 24.
Other structures are the same as those of the second embodiment, and the corresponding members / parts are denoted by the same reference numerals and description thereof is omitted.

Since the structure of the bus bar 30A of the fourth embodiment is basically the same as that of the bus bar 30 of the third embodiment, the same effects as the effects (1) to (3) of the third embodiment are achieved.
In addition, since the clad material is used in the fourth embodiment similarly to the second embodiment, the same effects as the effects (4) to (6) of the second embodiment are achieved.

--Embodiment 5--
FIG. 9 is an external perspective view of Embodiment 5 of the assembled battery bus bar according to the present invention.
The difference between the bus bar 40 of the fifth embodiment and the bus bar 10 of the first embodiment is that the first rising surface 13A and the second rising surface 14A are inclined with respect to the YZ plane.
The first rising surface 13 </ b> A is bent at an obtuse angle with respect to the first mounting surface 11, and the second rising surface 14 </ b> A is bent at an obtuse angle with respect to the second mounting surface 12.
In the fifth embodiment, since the first rising surface 13A and the second rising surface 14A are inclined so as to be separated from each other on the upper side, the connecting surface 15A of the fifth embodiment is longer than the connecting surface 15 of the first embodiment. ing.
Other structures are the same as those of the first embodiment, and the corresponding members / parts are denoted by the same reference numerals and description thereof is omitted.

Embodiment 5 has the following effects.
(1) The first mounting surface 11 and the second mounting surface 12 of the bus bar 10 are arranged perpendicular to the Z direction and are easily deformed in the Z direction. The connecting surface 15A of the bus bar 10 is arranged perpendicular to the Y direction and is easily deformed in the Y direction. The first rising surface 13A and the second rising surface 14A of the bus bar 10 are disposed so as to be inclined in the YZ plane, and are easily deformed in the X direction and the Z direction. Therefore, the bus bar 10 can obtain a stress relaxation effect for a load from any direction three-dimensionally.
Since only the first rising surface 13A and the second rising surface 14A are easily deformed in the X direction, it is preferable that the first rising surface 13A and the second rising surface 14A be as close to the YZ plane as possible.

(2) The connecting surface 15A of the bus bar 10 is disposed substantially perpendicular to the first rising surface 13A and the second rising surface 14A. For this reason, the space | interval of the 1st attachment surface 11 of the bus bar 40 and the 2nd attachment surface 12 can be made small. Thereby, the space | interval of the positive / negative electrode 2a, 2b of the adjacent cell 2 can be made small, and it becomes possible to reduce the assembled battery 1 in size.

--Embodiment 6--
FIG. 10 is an external perspective view of Embodiment 6 of the battery pack bus bar of the present invention.
A bus bar 40A shown in the sixth embodiment is obtained by applying a clad material to the bus bar 40 of the fifth embodiment as in the second embodiment.
The difference between the bus bar 40A of the sixth embodiment and the bus bar 20 of the second embodiment is that the first rising surface 23A and the second rising surface 24A are inclined with respect to the XY plane.
The first rising surface 23 </ b> A is bent at an obtuse angle with respect to the first mounting surface 21, and the second rising surface 24 </ b> A is bent at an obtuse angle with respect to the second mounting surface 22.
In the sixth embodiment, since the first rising surface 23A and the second rising surface 24A are inclined so as to be separated from each other on the upper side, the lengths of the first connecting surface 25A and the second connecting surface 26A of the sixth embodiment are as follows. Each is longer than the length of the first connecting surface 25 and the second connecting surface 26 of the second embodiment.
Other structures are the same as those of the second embodiment, and the corresponding members / parts are denoted by the same reference numerals and description thereof is omitted.

The bus bar 40A shown in the sixth embodiment has the same effects as the effects (1) and (2) of the fifth embodiment.
In addition, since the clad material is used in the sixth embodiment similarly to the second embodiment, the same effects as the effects (4) to (6) of the second embodiment are achieved.

--Embodiment 7--
FIG. 11 is an external perspective view of Embodiment 7 of the battery pack bus bar of the present invention.
The difference between the bus bar 50 of the seventh embodiment and the bus bar 10 of the first embodiment is that the connecting surface 15A is inclined with respect to the XZ plane, and the first rising surface 13A and the second rising surface 14A are inclined with respect to the YZ plane. It is a point that is structured.
The connecting surface 15A has the same structure as that of the third embodiment. The first rising surface 13A and the second rising surface 14A have the same structure as that of the fifth embodiment.
Other structures are the same as those of the first embodiment, and corresponding members and parts are denoted by the same reference numerals and description thereof is omitted.

In the seventh embodiment, the first mounting surface 11 and the second mounting surface 12 of the bus bar 50 are arranged perpendicular to the Z direction and are easily deformed in the Z direction. The connecting surface 15A of the bus bar 50 is arranged to be inclined with respect to the XZ plane, and is easily deformed in the Y direction and the X direction. The first rising surface 13A and the second rising surface 14A of the bus bar 50 are disposed so as to be inclined in the YZ plane, and are easily deformed in the X direction and the Z direction. Therefore, the bus bar 10 can obtain a stress relaxation effect for a load from any direction three-dimensionally.
The connecting surface 15A of the bus bar 50 is preferably as close to the XZ plane as possible in order to facilitate deformation in the Y direction.
It is preferable that the first rising surface 13A and the second rising surface 14A be as close to the YZ plane as possible in order to easily deform in the X direction.

--Eighth embodiment--
FIG. 12 is an external perspective view of an assembled battery bus bar according to an eighth embodiment of the present invention.
A bus bar 50A shown in the eighth embodiment is obtained by applying a clad material to the bus bar 50 of the seventh embodiment as in the second embodiment.
The difference between the bus bar 50A of the eighth embodiment and the bus bar 20 of the second embodiment is that the first connecting surface 25A and the second connecting surface 26A are inclined with respect to the XZ plane, and the first rising surface 23A and The second rising surface 24A is configured to be inclined with respect to the YZ plane.
Other structures are the same as those of the second embodiment, and the corresponding members / parts are denoted by the same reference numerals and description thereof is omitted.

The bus bar 50A of the eighth embodiment has the same effects as the bus bar 50 of the seventh embodiment.
In addition, since the clad material is used in the eighth embodiment as in the second embodiment, the same effects as the effects (4) to (6) of the second embodiment are achieved.

--Embodiment 9--
FIG. 13 is an external perspective view of Embodiment 9 of the battery pack bus bar of the present invention.
As in the first embodiment, the bus bar 60 of the ninth embodiment includes a first mounting surface 61, a second mounting surface 62, a first rising surface 63 rising from the first mounting surface 61, and a second rising surface rising from the second mounting surface 62. 64, and a connecting surface 67 connecting the first rising surface 63 and the second rising surface 64.
The first mounting surface 61 and the second mounting surface 62 are substantially parallel to the XY plane. Further, the first mounting surface 61 and the second mounting surface 62 are arranged at substantially the same position in the Z direction. The first rising surface 63 and the second rising surface 64 are substantially parallel to the YZ plane.

  The bus bar 60 of the ninth embodiment is different from the bus bar 10 of the first embodiment in that the first bent portion 65 is interposed between the first mounting surface 61 and the first rising surface 63, and the second mounting surface 62 and the second mounting surface 62. A second bent portion 66 is interposed between the rising surface 64. In addition, a connecting surface 67 that connects the first rising surface 63 and the second rising surface 64 is formed of an intermediate portion 67a, a first bent portion 67b, and a second bent portion 67c.

  The first bent portion 65 is formed to be inclined with respect to the YZ plane, and connects the first mounting surface 61 and the first rising surface 63. The second bent portion 66 is formed to be inclined in the direction opposite to the first bent portion with respect to the YZ plane, and connects the second mounting surface 62 and the second rising surface 64. The intermediate portion 67a of the connecting surface 67 is disposed in parallel to the XZ plane. The first bent portion 67 b of the connecting surface 67 is formed to be inclined with respect to the XZ plane and is connected to the first rising surface 63. The second bent portion 67 c of the connecting surface 67 is formed to be inclined to the opposite side of the first bent portion 67 b with respect to the XZ plane, and is connected to the second rising surface 64.

Since the first mounting surface 61 and the second mounting surface 62 are perpendicular to the Z direction, they are easily deformed in the Z direction. Since the first rising surface 63 and the second rising surface 64 are perpendicular to the X direction, they are easily deformed in the X direction. Since the first bent portion 65 and the second bent portion 66 are longer in the X direction and the Z direction than the curved portions 13a and 13b of the first embodiment, respectively, they are deformed in the X direction and the Z direction. easy. That is, the bus bar 60 of the sixth embodiment has a great flexibility regarding deformation in the X direction and the Z direction.
Since the intermediate portion 67a of the connecting surface 67 is perpendicular to the Y direction, it is easily deformed in the Y direction. The first bent portion 67b and the second bent portion 67c of the connecting surface 67 are easily deformed in the Y direction and the X direction.
The first bent portion 67b and the second bent portion 67c of the connecting surface 67 are preferably close to the XZ plane in order to facilitate deformation in the Y direction. In the ninth embodiment, as in the first embodiment, the entire connecting surface 67 may be an intermediate portion 67a parallel to the XZ plane.

As described above, according to the bus bar 60 of the ninth embodiment, it is possible to obtain a stress relaxation effect for a load from any direction three-dimensionally, and to increase the flexibility of deformation in each direction. Can do.
Further, the same effect as the effect (2) of the first embodiment is obtained.
Furthermore, there exists an effect similar to the effect (3) of Embodiment 3.

--Embodiment 10--
FIG. 14 is an external perspective view of Embodiment 10 of the battery pack bus bar of the present invention.
The bus bar 60A shown in the tenth embodiment is obtained by applying a clad material to the bus bar 60 of the ninth embodiment.
The first mounting surface 61, the first rising surface 63, the first bent portion 65, and the first connecting surface 68 are made of, for example, the same aluminum-based metal as the positive electrode 2a of the unit cell 2. The second mounting surface 62, the second rising surface 64, the second bent portion 66, and the second connecting surface 69 are made of, for example, the same copper-based metal as the negative electrode 2b of the unit cell 2.

The first connecting surface 68 has an intermediate portion 68a and a bent portion 68b. The bent portion 68 b is connected to the first rising surface 63. The second connecting surface 69 has an intermediate portion 69a and a bent portion 69b. The bent portion 69 b is connected to the second rising surface 64. The first connecting surface 68 and the second connecting surface 69 are diffusion-bonded at the joint surface k.
The intermediate portion 68a of the first connecting surface 68 and the intermediate portion 69a of the second connecting surface 69 are arranged in parallel to the XZ plane. The bent portion 68b of the first connecting surface 68 is disposed to be inclined with respect to the XZ plane. The bent portion 69b of the second connecting surface 69 is disposed to be inclined in the direction opposite to the bent portion 68b of the first connecting surface 68 with respect to the XZ plane.
Other structures are the same as those of the ninth embodiment, and corresponding members and parts are denoted by the same reference numerals and description thereof is omitted.

  According to the bus bar 60A of the tenth embodiment, the same effects as the bus bar 60 of the ninth embodiment are obtained. Moreover, there exists an effect similar to the effect (4)-(6) of Embodiment 2. FIG.

--Embodiment 11--
FIG. 15 is an external perspective view of Embodiment 11 of the battery pack bus bar of the present invention.
The bus bar 70 according to the eleventh embodiment includes a first mounting surface 71, a second mounting surface 72, a first rising surface 73 that rises from the first mounting surface 71, and a second mounting surface that are connected to one of the positive and negative electrodes 2a and 2b. A second rising surface 74 rising from 72, and a connecting surface 75 connecting the first rising surface 73 and the second rising surface 74.

The first mounting surface 71 and the second mounting surface 72 are substantially parallel to the XY plane. The first mounting surface 71 and the second mounting surface 72 are disposed at substantially the same position in the Z direction.
The first rising surface 73 and the second rising surface 74 are disposed substantially parallel to the YZ plane. The first rising surface 73 has a curved portion 73a, and is connected to one side portion of the first mounting surface 71 through the curved portion 73a. The second rising surface 74 has a curved portion 74a, and is connected to one side portion of the second mounting surface on the same side as the one side portion of the first mounting surface 71 via the curved portion 74a. The first rising surface 73 and the second rising surface 74 are disposed at substantially the same position in the X direction.

  The connecting surface 75 has an intermediate portion 75a, a first bent portion 75b provided on one end side of the intermediate portion 75a, and a second bent portion 75c provided on the other end side of the intermediate portion 75a. It has a U shape. That is, the connecting surface 75 has a concave portion having a U-shaped cross section that is bent in a direction intersecting the Y direction. The intermediate part 75a is disposed substantially parallel to the YZ plane. The first bent portion 75b and the second bent portion 75c are disposed substantially parallel to the XZ plane.

The bus bar 70 according to the eleventh embodiment has the following effects.
(1) Since the first mounting surface 71 and the second mounting surface 72 of the actual bus bar 70 are arranged perpendicular to the Z direction, they are easily deformed in the Z direction. Since the first rising surface 73 and the second rising surface 74 are disposed perpendicular to the X direction, they are easily deformed in the X direction. Since the intermediate portion 75a of the connecting surface 75 is disposed perpendicular to the Z direction, it is easily deformed in the X direction. Since the first bent portion 75b and the second bent portion 75c of the connecting surface 75 are arranged perpendicular to the Y direction, they are easily deformed in the Y direction. The connecting surface 75 of the bus bar 70 has a U-shaped cross section and is open on one side. For this reason, the bus bar 70 relaxes the stress in the Y direction by expanding or reducing the opening of the connecting surface 75.

(2) The first rising surface 73 of the bus bar 70 is formed to rise substantially vertically on one side of the first mounting surface 71, and the second rising surface 74 of the bus bar 70 is formed on one side of the second mounting surface 72. It is formed almost vertically. Therefore, the first rising surface 73 and the second rising surface 74 do not protrude outward from the side surface of the unit cell 2 in a state where the bus bar 70 is attached to the positive / negative electrode 2a, 2b of the unit cell 2. The width of the assembled battery 1 does not increase.

  In the eleventh embodiment, the connecting surface 75 is exemplified as a U-shaped cross section, but the connecting surface 75 may have a V-shaped cross section. That is, the intermediate portion 75a is eliminated, and the first bent portion 75b and the second bent portion 75c are directly connected. Even in this case, the opening side of the connecting surface 75 expands or contracts, so that the bus bar 70 is easily deformed in the Y direction. The connecting surface 75 may further have a W-shaped cross section, or the first bent portion 75b and the second bent portion 75c may be stepped.

--Embodiment 12--
FIG. 16 is an external perspective view of Embodiment 12 of the assembled battery bus bar according to the present invention.
A bus bar 70A according to the twelfth embodiment is obtained by applying a clad material to the bus bar 70 according to the eleventh embodiment.
In the bus bar 70A, the first mounting surface 71, the first rising surface 73, and the first connecting surface 76 are made of, for example, the same aluminum-based metal as the positive electrode 2a of the unit cell 2. The second mounting surface 72, the second rising surface 74, and the second connecting surface 77 are made of, for example, the same copper-based metal as the negative electrode 2b of the unit cell 2.

The first connecting surface 76 has an intermediate portion 76a and a bent portion 76b. The bent portion 76 b is connected to the first rising surface 73. The second connecting surface 77 has an intermediate portion 77a and a bent portion 77b. The bent portion 77 b is connected to the second rising surface 74. The first connecting surface 76 and the second connecting surface 77 are diffusion-bonded at the joint surface k. The first connecting surface 76 and the second connecting surface 76 are joined at the joining surface k to form a concave portion having a U-shaped cross section that is bent in a direction intersecting the Y direction.
The intermediate portion 76a of the first connecting surface 76 and the intermediate portion 77a of the second connecting surface 77 are disposed substantially parallel to the XZ plane. The bent portion 76b of the first connecting surface 76 and the bent portion 77b of the second connecting surface 77 are disposed substantially parallel to the XZ plane.
Other structures are the same as those of the eleventh embodiment, and corresponding members and parts are denoted by the same reference numerals and description thereof is omitted.

According to the bus bar 70A of the twelfth embodiment, the same effects as the effects (1) and (2) of the eleventh embodiment are achieved.
Further, according to the bus bar 70A of the twelfth embodiment, the same effects as the effects (4) to (6) of the second embodiment are obtained.

--Embodiment 13--
FIG. 17 is an external perspective view of Embodiment 13 of the assembled battery bus bar according to the present invention.
The bus bar 80 shown in the thirteenth embodiment is different from the bus bar 70 of the eleventh embodiment in that the first bent portion 81 is interposed between the first mounting surface 71 and the first rising surface 73, and the second mounting surface 72 and the first The second difference is that the second bent portion 82 is interposed between the two rising surfaces 74.
The first bent portion 81 and the second bent portion 82 are arranged to be inclined with respect to the YZ plane.
Other structures are the same as those of the eleventh embodiment, and corresponding members and parts are denoted by the same reference numerals and description thereof is omitted.

  In the bus bar 80 according to the thirteenth embodiment, the first mounting surface 71 and the second mounting surface 72 are arranged perpendicular to the Z direction, and therefore easily deform in the Z direction. Since the first rising surface 73 and the second rising surface 74 are disposed perpendicular to the X direction, they are easily deformed in the X direction. Since the first bent portion 81 and the second bent portion 82 are longer in the X direction and the Z direction than the curved portions 73a and 73b of the eleventh embodiment, they are deformed in the X direction and the Z direction, respectively. easy. That is, the bus bar 80 according to the thirteenth embodiment has a great flexibility regarding deformation in the X direction and the Z direction.

As described above, according to the bus bar 80 of the thirteenth embodiment, it is possible to obtain a stress relaxation effect with respect to a load from any direction three-dimensionally, and to increase the flexibility of deformation in each direction. Can do.
Further, the same effect as the effect (2) of the eleventh embodiment is achieved.

FIG. 18 is an external perspective view of Embodiment 14 of the battery pack bus bar of the present invention.
A bus bar 80A according to the fourteenth embodiment is obtained by applying a clad material to the bus bar 80 according to the thirteenth embodiment.
In the bus bar 80A, the first mounting surface 71, the first rising surface 73, the first bent portion 81, and the first connecting surface 76 are made of, for example, the same aluminum-based metal as the positive electrode 2a of the unit cell 2. The second mounting surface 72, the second rising surface 74, the second bent portion 82, and the second connecting surface 77 are made of, for example, the same copper-based metal as the negative electrode 2b of the unit cell 2.

  As in the twelfth embodiment, the first connecting surface 76 has an intermediate portion 76a and a bent portion 76b, and the second connecting surface 77 has an intermediate portion 77a and a bent portion 77b. Details of the first connecting surface 76 and the second connecting surface 77 are as described in the twelfth embodiment.

Similar to the thirteenth embodiment, the first bent portion 81 and the second bent portion 82 are arranged to be inclined with respect to the YZ plane. Details of the first bent portion 81 and the second bent portion 82 are as described in the thirteenth embodiment.
Other structures are also the same as those in the thirteenth embodiment, and the corresponding members / parts are denoted by the same reference numerals and the description thereof is omitted.

The bus bar 80A according to the fourteenth embodiment basically has the same structure as the bus bar 80 according to the thirteenth embodiment, and therefore has the same effects as the thirteenth embodiment.
Moreover, since the bus bar 80A is formed of the clad material, the same effects as the effects (4) to (6) of the second embodiment are obtained.

As described above, according to the assembled battery bus bar and the assembled battery shown in each embodiment, a stress relaxation effect can be obtained with respect to a load from any direction three-dimensionally.
Further, by forming the first mounting surface 11 and the second mounting surface 12 from different metals, there is an effect of increasing the bonding strength between the positive and negative electrodes 2a and 2b of the assembled battery 1.

  In each of the above-described embodiments, the first mounting surfaces 11, 21, 61, 71 and the second mounting surfaces 12, 22, 62, 72 are exemplified as a structure arranged toward the lower surface side. However, you may make it arrange | position the 1st attachment surfaces 11, 21, 61, 71 and the 2nd attachment surfaces 12, 22, 62, 72 toward the opposite side. That is, in the case of the first embodiment, the second mounting surface 12 is provided above the second rising surface 14.

  In the first to tenth embodiments, the lengths of the connecting surfaces 15, 15 </ b> A, 25, 25 </ b> A, 26 </ b> A, 6768, 69 are set to the first mounting surfaces 11, 21, 61, 71 and the second mounting surfaces 12, 22, 62, 72. It was illustrated as a length corresponding to the length in the X direction. However, the lengths of the connecting faces 15, 15A, 25, 25A, 26A, 67, 68, 69 may be longer or shorter. That is, in the case of the first embodiment, the length of the connecting surface 15 is increased or decreased in the X direction so that the second rising surface 14 is placed outside the side portion 11a of the first mounting surface 11. You may arrange | position and may arrange | position inside.

  In the above embodiments 11 to 14, the first rising surface 73 and the second rising surface 74 may be inclined with respect to the YZ plane. That is, as shown in the fifth embodiment, the first rising surface 73 and the second rising surface 74 may be inclined with respect to the first mounting surface 71 or the second mounting surface 72.

  In the said Embodiments 11-14, the 1st rising surface 73 and the 2nd rising surface 74 were illustrated as a structure arrange | positioned in the same position in a X direction. However, the first rising surface 73 and the second rising surface 74 may be arranged at different positions in the X direction.

  In each of the above embodiments, the joining surface k of the clad material is exemplified as a structure provided in a substantially middle portion of the connecting surfaces 15, 67, 75. However, the bonding surface k of the clad material may be provided in another flat region such as in the region of the first rising surfaces 11, 21, 61, 71 or in the region of the second rising portions 12, 22, 62, 71. it can.

  Further, in each of the above embodiments, a curved portion, a bent portion, or an inclined portion may be appropriately added to a flat portion on the mounting surface, the rising surface, and the connecting surface, or a step portion may be provided. . Moreover, you may combine the structure shown by said each embodiment.

  The present invention is not limited to a bus bar for connecting a lithium ion secondary battery, but is also applied to a bus bar for connecting a secondary battery using a water-soluble electrolyte such as a nickel metal hydride battery, a nickel cadmium battery, or a lead storage battery. Is possible. The present invention can also be applied to bus bars for connecting power storage elements such as lithium ion capacitors and electrolytic double layer capacitors.

  In addition, the assembled battery bus bar of the present invention can be applied in various modifications. In short, the first mounting surface and the second mounting surface are arranged in parallel to the XY plane, and the first rising surface. And the second rising surface may be arranged in parallel or inclined to the YZ plane, and the connecting surface may be arranged parallel or inclined to the XZ plane.

1 assembled battery 2 unit cell 2a positive electrode 2b negative electrode 10, 20, 30, 30A, 40, 40A, 50, 50A, 60, 60A, 70, 70A Bus bar 11, 21, 61, 71 First mounting portion 12, 22 62, 72 Second mounting part 13, 13A, 23, 23A, 63, 73 First rising part 14, 14A, 24, 24A, 64, 74 Second rising part 15, 15A, 25, 25A, 26, 26A, 67, 68, 69, 75, 76, 77 Connecting surface k Joint surface

Claims (6)

A plurality of rectangular electricity storage elements each provided with a positive electrode and a negative electrode of a block member on one surface, and a battery group arranged in a row so that the positive electrode and the negative electrode of the adjacent electricity storage element face each other; ,
In a battery pack having a bus bar connecting the positive electrode and the negative electrode of the electricity storage elements adjacent to each other,
The bus bar is
A first mounting surface welded to one of the positive electrode or the negative electrode of the block member;
A second mounting surface welded to the other of the positive electrode or the negative electrode of the block member and parallel to the first mounting surface;
A first rising surface rising from the first mounting surface;
A second rising surface rising from the second mounting surface,
The first rising surface and the second rising surface are connected via a connecting surface,
A direction parallel to the one surface and perpendicular to the arrangement direction of the storage elements is defined as an X direction, a direction parallel to the one surface and perpendicular to the X direction is defined as a Y direction, and a direction perpendicular to the X direction and the Y direction is defined as a Z direction. In this case, the first mounting surface and the second mounting surface are arranged in parallel to the XY plane, and the first rising surface is parallel to the YZ plane from a side portion on one end side in the X direction of the first mounting surface. Alternatively, the second rising surface is arranged parallel to or inclined with respect to the YZ plane from the side portion on the same side as the first mounting surface in the X direction of the second mounting surface, and the connecting surface is Y A concave portion having a U-shaped cross section bent in a direction intersecting the direction,
A first curved portion or inclined portion is formed between the first mounting surface and the first rising surface, and a second curved portion or inclined portion is formed between the second mounting surface and the second rising surface. An assembled battery is formed. The assembled battery according to claim 1,
A third curved portion or inclined portion is formed between the first rising surface and the connecting surface, and a fourth curved portion or inclined portion is formed between the second rising surface and the connecting surface. A battery pack. The assembled battery according to claim 1,
The assembled battery having an intermediate portion in which the connecting surface is arranged in parallel to the XZ plane. The assembled battery according to any one of claims 1 to 3,
The bus bar is formed of a different metal material in a portion forming the first mounting surface and the second mounting surface, and the first rising surface, the second rising surface, or the connecting surface is made of a different metal. An assembled battery formed of a clad material having a bonding surface. The assembled battery according to claim 4,
The assembled battery is provided with a bonding surface of the clad material provided in a region other than the curved region or the bent region of the bus bar . The assembled battery according to claim 4,
The assembled battery, wherein the first mounting surface is formed of an aluminum-based metal and the second mounting surface is formed of a copper-based metal.

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