Busbars and battery packs

Abstract

The bus bar (320) has a first member (321) and a second member (322) laminated with the first member (321). The first member (321) and the second member (322) include a solid-phase joint portion (320A) formed by solid-phase joining each other. The first member (321) includes a concave recess (321e) exposed at a first outer edge (321d) (outer edge). The second member (322) includes a concave recess (322e) exposed at a first outer edge (322d) (outer edge). The recess (321e) and the recess (322e) are adjacent to the solid-phase joint portion (320A).

Description

Technical Field

[0001] This invention relates to busbars and battery packs. Background Technology

[0002] Previously, it was known that busbars were formed by solid-state bonding of two or more components (see, for example, Patent Document 1).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2011-210480 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] There is a need for a busbar that, when two or more components are solid-state bonded, ensures that the upper limit of the external dimensions of the two or more components meets a specified range, and a battery pack having the busbar.

[0008] Methods for solving problems

[0009] The busbar has a first component and a second component stacked on top of the first component. The first component and the second component include a solid-state joint formed by solid-state bonding. At least one of the first component and the second component includes a concave recess exposed at its outer edge. The recess is adjacent to the solid-state joint.

[0010] The battery pack has batteries and the busbar connected to the batteries.

[0011] Invention Effects

[0012] A busbar is provided that, when two or more components are solid-state bonded, the upper limit of the external dimensions of the two or more components meets a specified range, and a battery pack having the busbar is also provided. Attached Figure Description

[0013] Figure 1 This is a perspective view showing the battery pack 1 according to the first embodiment.

[0014] Figure 2 It is shown Figure 1 A top view of battery pack 1.

[0015] Figure 3 This is a perspective view showing a portion of the constituent components of the holding unit 200 being decomposed in the width direction Y and the stacking direction X, for a plurality of batteries 100 and holding units 200.

[0016] Figure 4 It shows from Figure 3 A perspective view of the state in which the first side plate 231 and the second side plate 232 and the fastening bolt 241 are removed, and the constituent components of the battery 100 and the holding unit 200 are decomposed in the stacking direction X.

[0017] Figure 5 This is a perspective view showing the bus unit 300, voltage detection unit 400, and temperature measurement unit 500, excluding the bus holder 340, separated from the bus holder 340 along the height direction Z.

[0018] Figure 6 This shows an enlarged view. Figure 1 A 3D view of region 6.

[0019] Figure 7 This is a three-dimensional view of busbar 320 as seen from above.

[0020] Figure 8 This shows the view from below. Figure 7 A 3D diagram of the 320 busbar.

[0021] Figure 9 It is shown Figure 7 A top view of the 320 busbar.

[0022] Figure 10 This shows an enlarged view. Figure 9 Top view of area 10.

[0023] Figure 11 It is shown Figure 7 A bottom view of the 320 busbar.

[0024] Figure 12 This shows an enlarged view. Figure 11 A bottom view of area 12.

[0025] Figure 13 It is shown Figure 7 Side view of busbar 320.

[0026] Figure 14 It shows that Figure 7 An exploded perspective view of the first component 321 and the second component 322 of the busbar 320.

[0027] Figure 15 This is a top view showing the main part of the bus 610 of the second embodiment.

[0028] Figure 16 It is shown Figure 15 A bottom view of busbar 610.

[0029] Figure 17 This is a top view showing the main parts of the bus 620 according to the third embodiment.

[0030] Figure 18 It is shown Figure 17 A bottom view of the 620 busbar.

[0031] Figure 19 This is a perspective view showing the main parts of the busbar 630 according to the fourth embodiment.

[0032] Figure 20 This is a perspective view showing the main parts of the busbar 640 according to the fifth embodiment.

[0033] Figure 21 This is a perspective view showing the main parts of the bus 650 according to the sixth embodiment.

[0034] Figure 22 This is a top view showing the main parts of the bus 660 according to the seventh embodiment.

[0035] Figure 23 This is a top view showing the main part of the bus 670 according to the eighth embodiment.

[0036] Figure 24 This is a top view showing the main parts of the bus 680 according to the ninth embodiment.

[0037] Figure 25 This is a top view showing the main parts of the busbar 710 according to the tenth embodiment.

[0038] Figure 26 It is shown Figure 25 A bottom view of the 710 busbar.

[0039] Figure 27 This is a top view showing the main parts of the busbar 720 according to the eleventh embodiment.

[0040] Figure 28 It is shown Figure 27 A bottom view of the main part of the 720 busbar.

[0041] Figure 29 This is a perspective view showing the busbar 730 of the twelfth embodiment as viewed from above.

[0042] Figure 30 This shows the view from below. Figure 29 A 3D view of busbar 730.

[0043] Figure 31 This is a perspective view showing the busbar 740 of the thirteenth embodiment as seen from above.

[0044] Figure 32 This shows the view from below. Figure 31 A 3D diagram of busbar 740.

[0045] Figure 33 This is a perspective view showing the busbar 750 of the fourteenth embodiment as viewed from above.

[0046] Figure 34 This shows the view from below. Figure 33 A 3D diagram of the 750 busbar.

[0047] Figure 35 This is a perspective view showing the busbar 760 of the fifteenth embodiment as viewed from above.

[0048] Figure 36 This shows the view from below. Figure 35 A 3D view of the 760 busbar.

[0049] Figure 37 This is a perspective view showing the busbar 770 of the sixteenth embodiment as seen from above.

[0050] Figure 38 This is a perspective view showing the main part of a busbar 810 according to another embodiment. Detailed Implementation

[0051] Embodiments for carrying out the present invention will be described with reference to the accompanying drawings. To facilitate understanding of the various embodiments, the size and proportions of the constituent components are sometimes exaggerated in the drawings. The same reference numerals are used for the same components in each drawing. Arrows indicate the stacking direction X, width direction Y, and height direction Z of the battery pack 1 in each drawing. However, the stacking direction X, width direction Y, and height direction Z of the battery pack 1 in each drawing show relative positional relationships within the same drawing. That is, when the battery pack 1 is rotated 180 degrees to reverse the upper and lower surfaces, or when the battery pack 1 is rotated 90 degrees to align the upper surface as a side surface, the stacking direction X, width direction Y, and height direction Z of the battery pack 1 will change. The threads on the outer circumferential surface of the fastening bolts and the grooves on the inner circumferential surface of the nut are omitted from the drawings.

[0052] The stacking direction of the first component 321 and the second component 322 of the busbar 320 is called the "stacking direction A" of the first component 321 and the second component 322. The stacking direction A corresponds to the height direction Z of the battery pack 1. During the ultrasonic bonding of the first component 321 and the second component 322, the direction in which the welding head vibrates is called the "vibration direction B". The vibration direction B is orthogonal to the stacking direction A. The vibration direction B corresponds to the stacking direction X of the battery pack 1. The directions orthogonal to both the stacking direction A and the vibration direction B are called the "width direction C" of the first component 321 and the second component 322. The width direction C corresponds to the width direction Y of the battery pack 1.

[0053] In the various embodiments and their variations, configurations identical to those described above are given the same reference numerals, and repeated descriptions are omitted. Configurations identical to those described above include not only those identical to those described above, but also those substantially identical to those described above.

[0054] (The configuration of the battery pack 1, including the busbar 320 of the first embodiment)

[0055] Reference Figures 1 to 14 The configuration of the battery pack 1, including the busbar 320 of the first embodiment, will be described.

[0056] Figure 1 This is a perspective view showing the battery pack 1 according to the first embodiment. Figure 2 It is shown Figure 1 A top view of battery pack 1. Figure 3 This is a perspective view showing a portion of the constituent components of the holding unit 200 being decomposed in the width direction Y and the stacking direction X, for the plurality of batteries 100 and the holding unit 200. Figure 4 It shows from Figure 3 A perspective view of the state in which the first side plate 231 and the second side plate 232 and the fastening bolt 241 are removed, and the constituent components of the battery 100 and the holding unit 200 are decomposed in the stacking direction X. Figure 5 This is a perspective view showing the bus unit 300, voltage detection unit 400, and temperature measurement unit 500, excluding the bus holder 340, separated from the bus holder 340 along the height direction Z. Figure 6 This shows an enlarged view. Figure 1 A 3D view of region 6.

[0057] Figure 7 This is a three-dimensional view of busbar 320 as seen from above. Figure 8 This shows the view from below. Figure 7 A 3D diagram of the 320 busbar. Figure 9 It is shown Figure 7 A top view of the 320 busbar. Figure 10 This shows an enlarged view. Figure 9 Top view of area 10. Figure 11 It is shown Figure 7 A bottom view of the 320 busbar. Figure 12 This shows an enlarged view. Figure 11 A bottom view of area 12. Figure 13 It is shown Figure 7 Side view of busbar 320. Figure 14 It shows that Figure 7 An exploded perspective view of the first component 321 and the second component 322 of the busbar 320.

[0058] Battery pack 1 may be configured, for example, as a power source for operating a motor used for driving a vehicle. Battery pack 1 may also be configured, for example, as a power source for operating electrical equipment mounted in a vehicle.

[0059] like Figure 1 As shown, the battery pack 1 includes a plurality of batteries 100, a holding unit 200 for holding the plurality of batteries 100, and a bus unit 300 electrically connecting the plurality of batteries 100. Additionally, the battery pack 1 includes a voltage detection unit 400 for detecting the voltage of the batteries 100, and a temperature measurement unit 500 for measuring the temperature of the batteries 100. The configuration of the battery pack 1 will be described below.

[0060] (Composition of battery 100)

[0061] Figures 1 to 4 The battery 100 shown is stacked along the stacking direction X via a holding unit 200. For example... Figure 2 As shown, for example, 20 batteries 100 are stacked. Each battery 100 is, for example, a lithium-ion secondary battery. Each battery 100 includes a current collector and an electrolyte. Figure 4 As shown, the battery 100 includes a container 101, a cover 102, a positive terminal 103, a negative terminal 104, and a safety valve 105. The configuration of the battery 100 will be described below.

[0062] like Figure 4 As shown, the battery 100 is formed in a cuboid shape. A positive terminal 103 and a negative terminal 104 are provided on the upper surface 100a of the battery 100 along the stacking direction X. Figure 4 In this context, the upper surface 100a corresponds to the upper surface of the battery 100. The upper surface 100a is formed in a rectangular shape. In the upper surface 100a, the length along the width direction Y of the battery 100 is longer than the length along the stacking direction X of the battery 100. The upper surface 100a and... Figure 1 The busbar units 300 shown are opposite each other. Two side surfaces 100b along the stacking direction X of the battery 100 are orthogonally opposite the upper surface 100a. The side surfaces 100b are rectangular in shape. In the side surfaces 100b, the length along the height direction Z of the battery 100 is longer than the length along the stacking direction X of the battery 100. Two opposing main surfaces 100c on the stacking direction X of the battery 100 are in contact with the unit spacers 202 of the holding unit 200, etc.

[0063] The current collector of battery 100 acts as a charging and discharging element for inputting and outputting power. The current collector of battery 100 is formed by winding or stacking positive and negative electrodes separated by a separator. The current collector and electrolyte are housed in container 101. A cover 102, together with container 101, seals the current collector and electrolyte. The cover 102 is joined to container 101. Positive terminal 103 and negative terminal 104 relay the input and output of power between the current collector and electrical equipment. Positive terminal 103 and negative terminal 104 are mounted on cover 102. Figure 4 As shown, the positive terminal 103 of one battery 100 and the negative terminal 104 of another battery 100 are opposite each other in the stacking direction X. When the internal pressure of a battery 100 exceeds a predetermined value, a safety valve 105 bursts outward from the battery 100. The safety valve 105 is also called a burst valve. The safety valve 105 is, for example, provided on a cover 102.

[0064] (The structure of retaining unit 200)

[0065] Figures 1 to 4 The holding unit 200 shown holds multiple batteries 100. For example... Figure 4 As shown, the retaining unit 200 includes a first end spacer 201, a unit spacer 202, and a second end spacer 203. Additionally, the retaining unit 200 includes a first end block 211, a second end block 212, an insulating member 221, and an embedded nut 222. Furthermore, as... Figure 3 As shown, the retaining unit 200 includes a first side plate 231, a second side plate 232, and a fastening bolt 241. The configuration of the retaining unit 200 will be described below.

[0066] like Figure 4 As shown, a first end spacer 201 is disposed between the first end block 211 and the battery 100. The first end spacer 201 contacts the first battery 100 located at one end among the stacked 20 batteries 100. This battery 100 corresponds to... Figure 2 The battery 100 is located at the left end. A first end spacer 201 insulates the first end block 211 and the battery 100. The first end spacer 201 covers the first end block 211 and the battery 100 on their respective sides along the width direction Y. The first end spacer 201 covers a portion of the side 100b of the battery 100 along the stacking direction X. The thickness of the first end spacer 201 along the stacking direction X is sufficiently thinner than the thickness of the battery 100 along the stacking direction X. The first end spacer 201 is formed of an insulating material.

[0067] like Figure 4As shown, a cell spacer 202 is disposed between adjacent cells 100. The cell spacer 202 holds and insulates the adjacent cells 100. The cell spacer 202 covers a portion of the respective main surfaces 100c of the adjacent cells 100 along the width direction Y, and a portion of the respective side surfaces 100b of the adjacent cells 100 along the stacking direction X. The thickness of the cell spacer 202 along the stacking direction X is sufficiently thinner than the thickness of the cells 100 along the stacking direction X. The cell spacer 202 is formed of an insulating material.

[0068] like Figure 4 As shown, a second end spacer 203 is disposed between the battery 100 and the second end block 212. The second end spacer 203 contacts the 20th battery 100 located at the other end among the stacked 20 batteries 100. This battery 100 corresponds to... Figure 2 The battery 100 is located at the right end. A second end spacer 203 insulates the battery 100 and the second end block 212. The second end spacer 203 covers the first end block 211 and the battery 100 along the width direction Y. The second end spacer 203 covers a portion of the side 100b of the battery 100 along the stacking direction X. The thickness of the second end spacer 203 along the stacking direction X is sufficiently thinner than the thickness of the battery 100 along the stacking direction X. The second end spacer 203 is formed of an insulating material.

[0069] like Figure 4 As shown, the first end block 211 is stacked with the first battery 100 located at one end of the stacked 20 batteries 100, separated by the first end spacer 201. The first end block 211 extends along the width direction Y, intersecting the stacking direction X of the batteries 100. The first end block 211 is adjacent to and supports the battery 100 located at the end along the stacking direction X. The first end block 211 is formed into a cuboid shape extending in the width direction Y. In the first end block 211, the fastening bolt 241 is threaded to a portion formed in the first end block 211. Figure 3 As shown, multiple screw holes 211m are present on the side along the width direction Y. (As...) Figure 1 As shown, the first end block 211 is fixed to the first side plate 231 by fastening bolts 241. Similarly, the first end block 211 is fixed to the second side plate 232 by fastening bolts 241. Insertion holes 211n for inserting bolts or the like for fixing the battery pack 1 are formed on the first end block 211. The first end block 211 is made of, for example, metal or resin.

[0070] like Figure 4As shown, the second end block 212 is stacked with the 20th battery 100 located on the other end side of the stacked 20 batteries 100, separated by the second end spacer 203. The second end block 212 extends along the width direction Y of the battery 100. The second end block 212 is adjacent to and supports the battery 100 located at the end along the stacking direction X. The second end block 212 is formed into a cuboid shape extending in the width direction Y. In the second end block 212, the fastening bolt 241 is threaded to the portion formed in the end block. Figure 3 As shown, multiple screw holes on the side along the width direction Y. Figure 1 As shown, the second end block 212 is fixed to the first side plate 231 by fastening bolts 241. Similarly, the second end block 212 is fixed to the second side plate 232 by fastening bolts 241. Insertion holes 212n for inserting bolts or the like for fixing the battery pack 1 are formed on the second end block 212. The second end block 212 is made of, for example, metal or resin.

[0071] like Figure 4 As shown, the insulating member 221 is inserted into the first end block 211. Additionally, the insulating member 221 is inserted into the second end block 212. The insulating member 221 is, for example, formed in a cuboid shape. The insulating member 221 is formed of an insulating material.

[0072] The insulating member 221 can also be configured as follows: The insulating member 221 can be integrally formed with the first end spacer 201, or it can be separately formed from the first end spacer 201 and then joined to the first end spacer 201. In this case, the first end block 211 has a recess on its surface opposite to the first end spacer 201 that accommodates the insulating member 221 along the lamination direction X. Similarly, the insulating member 221 can be integrally formed with the second end spacer 203, or it can be separately formed from the second end spacer 203 and then joined to the second end spacer 203. In this case, the second end block 212 has a recess on its surface opposite to the second end spacer 203 that accommodates the insulating member 221 along the lamination direction X.

[0073] like Figure 3 As shown, the embedded nut 222 is embedded in a recess formed on the upper surface of the insulating member 221. The embedded nut 222 secures the fastening bolt, for example, through a busbar that is connected to an external control device.

[0074] like Figure 1As shown, a first side plate 231 is disposed at one end of the plurality of batteries 100 along the stacking direction X, in the width direction Y. The first side plate 231 holds the plurality of batteries 100 along the stacking direction X. The two ends of the first side plate 231 extending along the stacking direction X are bent toward the width direction Y. Regarding the first side plate 231, as... Figure 3 As shown, the fastening bolt 241 is inserted into a plurality of insertion holes 231m formed on the side surface along the width direction Y. Figure 1 As shown, the first side plate 231 is fixed to the first end block 211 and the second end block 212 by fastening bolts 241.

[0075] like Figure 1 As shown, a second side plate 232 is disposed at the opposite end of the plurality of batteries 100 along the stacking direction X of the stacked plurality of batteries 100 in the width direction Y. The second side plate 232 holds the plurality of batteries 100 along the stacking direction X. The two ends of the second side plate 232 extending along the stacking direction X are bent toward the width direction Y. Regarding the second side plate 232, as... Figure 3 As shown, the fastening bolt 241 is inserted into a plurality of insertion holes 232m formed on the side surface along the width direction Y. Figure 1 As shown, the second side plate 232 is fixed to the first end block 211 and the second end block 212 by fastening bolts 241.

[0076] like Figure 2 As shown, fastening bolts 241 fasten the first side plate 231 and the first end block 211, as well as the first side plate 231 and the second end block 212. Additionally, as... Figure 2 As shown, fastening bolts 241 fasten the second side plate 232 and the first end block 211, as well as the second side plate 232 and the second end block 212.

[0077] (Composition of bus unit 300)

[0078] Reference Figure 1 , Figure 2 as well as Figures 5 to 14 The configuration of bus unit 300 is explained.

[0079] like Figure 5 As shown, the bus unit 300 includes a first end bus 310, a plurality of buses 320, a second end bus 330, and a bus holder 340. Figure 1 , Figure 2 as well as Figures 5 to 14 The bus 320 shown connects multiple batteries 100 electrically. Figure 1 , Figure 2 as well as Figure 5The first end bus 310 and the second end bus 330 shown electrically connect the battery 100 to external electrical equipment. The configuration included in the bus unit 300 will be described below.

[0080] (Composition of the first end busbar 310 (busbar))

[0081] Reference Figure 1 , Figure 2 as well as Figure 5 The configuration of the first end busbar 310 will be described.

[0082] like Figure 2 As shown, the first end busbar 310, as an example, is connected to the positive terminal 103 of the battery 100 closest to the first end block 211 among the stacked 20 batteries 100. Figure 5 As shown, the first end busbar 310 has a first component 311 and a second component 312. The first end busbar 310 is formed, for example, by solid-state bonding of a first component 311 containing copper and a second component 312 containing aluminum.

[0083] (First component 311)

[0084] The first component 311 is connected to a bus or wiring that communicates with external electrical equipment. The external electrical equipment may be, for example, a relay or motor installed in an electric vehicle. The first end bus 310 may also be configured to connect to a bus that connects battery pack 1 in series or in parallel. An insertion hole 311i is formed on the first component 311. A fastening bolt is inserted into the insertion hole 311i. The first component 311 is connected to the bus or wiring that communicates with external control equipment via the fastening bolt. Apart from this, the construction and material of the first component 311 are the same as those of the first component 321 of the bus 320 described later.

[0085] (Second component 312)

[0086] As an example, the second component 312 is attached to the positive terminal 103 of the battery 100 located at one end of the stacked 20 batteries 100 along the stacking direction X. The other than that, the configuration and material of the second component 312 are the same as those of the second component 322 of the busbar 320 described later.

[0087] (Composition of busbar 320)

[0088] Reference Figure 1 , Figure 2 , Figures 5 to 14 The composition of busbar 320 will be explained.

[0089] like Figure 2As shown, bus 320 electrically connects one battery 100 and another battery 100 adjacent to each other along the stacking direction X of the batteries 100. Bus 320 is connected to the positive terminal 103 of one battery 100 and the negative terminal 104 of the other battery 100 adjacent to each other along the stacking direction X of the batteries 100.

[0090] like Figure 7 and Figure 8 As shown, busbar 320 has a first member 321 and a second member 322 stacked on top of the first member 321. The first member 321 and the second member 322 include a solid-state bond 320A formed by solid-state bonding. For example, a battery 100 having a negative terminal 104 containing copper and another battery 100 having a positive terminal 103 containing aluminum are electrically connected via busbar 320. Therefore, busbar 320 is formed, for example, by solid-state bonding of the first member 321 containing copper and the second member 322 containing aluminum.

[0091] (First component 321)

[0092] like Figure 7 and Figure 8 As shown, the first component 321 includes a first mounting portion 321P, a first bending portion 321Q, and a first joining portion 321R. The first component 321 is integrally formed in the order of the first mounting portion 321P, the first bending portion 321Q, and the first joining portion 321R.

[0093] like Figure 2 As shown, the first mounting part 321P is mounted on the negative terminal 104 (electrode terminal) of the battery 100. Figure 7 and Figure 8 As shown, the first mounting portion 321P is formed in the shape of a plate. In the first mounting portion 321P, a mounting surface 321a, formed by the vibration direction B and a width direction C orthogonal to the vibration direction B, is mounted on the negative terminal 104. The first mounting portion 321P extends along the vibration direction B. The first mounting portion 321P may also have a through hole. For example, an inspection instrument is inserted into the through hole of the first mounting portion 321P, and the inspection instrument contacts the negative terminal 104 to inspect the electrical characteristics of the battery 100. The corners of the first mounting portion 321P may be bent or formed as straight notches. The first mounting portion 321P is laser-engaged with the negative terminal 104, for example.

[0094] The first bending portion 321Q is the portion that bends from the end of the first mounting portion 321P in the stacking direction A. The first bending portion 321Q is also the portion that bends from the end of the first joining portion 321R in the stacking direction A. For example... Figure 7 and Figure 8As shown, the first bent portion 321Q extends along the lamination direction A between the first joint portion 321R and the first mounting portion 321P. The first bent portion 321Q is orthogonal to the first mounting portion 321P and the first joint portion 321R. Figure 7 As shown, the first bending portion 321Q is formed in the shape of a plate. The first boundary 321b of the boundary portion between the first bending portion 321Q and the first mounting portion 321P is formed in the shape of an arc. The second boundary 321c of the boundary portion between the first bending portion 321Q and the first joining portion 321R is formed in the shape of an arc.

[0095] like Figure 7 and Figure 8 As shown, the first bend 321Q extends from one end of the stacking direction A to the other end between the first joint 321R and the first mounting portion 321P. One end of the first bend 321Q is connected to the first mounting portion 321P. The other end of the first bend 321Q is connected to the first joint 321R. The shape of the first bend 321Q extending from one end of the stacking direction A to the other end is such that after extending from one end of the stacking direction A to the other end, it does not fold back from the other end of the stacking direction A to one end. That is, the overall shape of the first bend 321Q is not composed of a U-shape or the like. A U-shaped shape as the overall shape is equivalent to a shape that extends from one end of the stacking direction A to the other end and then folds back from the other end of the stacking direction A to one end. The first bend 321Q may also be composed of a U-shape or the like as part of the overall shape. That is, a portion of the region from one end of the first bend 321Q to the other end may also include a U-shape or the like. One end of the first bend 321Q and the other end of the first bend 321Q are not in the same position or are in relatively close positions along the stacking direction A.

[0096] The first bend 321Q positions the solid-state junction 320A differently from the junction with the negative terminal 104 of the battery 100. This position is relative to the positive terminal 103 or negative terminal 104 of the battery 100 along the height direction Z. Furthermore, the first bend 321Q suppresses the spring constant of the busbar 320. Specifically, the first bend 321Q alleviates stress on the busbar 320 caused by the expansion and contraction of the battery 100 or vibration of the battery pack 1. The longer the first bend 321Q is along the stacking direction A, the smaller the spring constant. The shorter the length of the first bend 321Q, the smaller its resistance.

[0097] The length of the first bend 321Q is, for example, 0.1 mm or more and 50 mm or less. The length of the first bend 321Q along the lamination direction A is preferably 1 mm or more and 20 mm or less, more preferably 2 mm or more and 10 mm or less. The angle of the first bend 321Q is 0 degrees relative to the lamination direction A and 90 degrees relative to the surface where the solid-state bonding portion 320A is provided. The angle of the first bend 321Q is preferably 30 degrees or more and 150 degrees or less, more preferably 45 degrees or more and 135 degrees or less. The magnitude of the bend R of the first boundary 321b and the second boundary 321c of the first bend 321Q is, for example, 0.001 mm or more and 8 mm or less. The magnitude of the bend R is preferably 0.01 mm or more and 4 mm or less, more preferably 0.1 mm or more and 2 mm or less.

[0098] like Figure 7 and Figure 8 As shown, the first joint portion 321R is connected to the first bending portion 321Q. The first joint portion 321R contacts the second member 322 in the lamination direction A. Figure 7 As shown, the first joint portion 321R is formed in the shape of a plate. In the first joint portion 321R, the surface formed by the vibration direction B and the width direction C orthogonal to the vibration direction B contacts the second member 322. The first joint portion 321R extends along the vibration direction B. The first joint portion 321R is not opposite to the first mounting portion 321P along the lamination direction A. The first joint portion 321R extends along the vibration direction B in a direction separating it from the first mounting portion 321P via the first bending portion 321Q. The first joint portion 321R is formed parallel to the first mounting portion 321P.

[0099] The thinner the first component 321, the more effectively it alleviates the stress on the solid-state junction 320A of the busbar 320. The thicker the first component 321, the lower the resistance of the busbar 320. The thickness of the first component 321 is, for example, 0.1 mm or more and 3 mm or less. Preferably, the thickness of the first component 321 is 0.3 mm or more and 2 mm or less, more preferably 0.4 mm or more and 1.5 mm or less. The thickness of the first component 321 can also be partially reduced or increased.

[0100] The first component 321 is electrically conductive. The hardness of the first component 321 is higher than that of the second component 322. The hardness can be specified, for example, based on Brinell hardness, Vickers hardness, Rockwell hardness, or Shore hardness. The Young's modulus of the first component 321 is higher than that of the second component 322. That is, the first component 321 is more rigid than the second component 322 and is less prone to deformation. The first component 321 may contain, for example, copper or a copper alloy. When the first component 321 is a copper alloy, as an example, an alloy from the 1000 series, 2000 series, 3000 series, 4000 series, 5000 series, 6000 series, or 7000 series can be used. In the quenching and tempering of the copper alloy, as an example, a material treated with any of the following: F, O, 1 / 4H, 1 / 2H, 3 / 4H, H, EH, or SH can also be used for the first component 321.

[0101] The first component 321 may also be electroplated (coated). Electroplating is performed on the first component 321 at least in the portion where it is solid-state bonded to the second component 322. Electroplating, as an example, includes electrolytic nickel plating, chemical nickel plating, tin plating, zinc plating, chromium plating, gold plating, silver plating, copper plating, and rhodium plating. Electroplating is preferably nickel plating, and more preferably electrolytic nickel plating. The thickness of the electroplating is, for example, 0.1 μm or more and 100 μm or less. The thickness of the electroplating is preferably 0.2 μm or more and 50 μm or less, and more preferably 0.5 μm or more and 10 μm or less. The gloss of the electroplating is, for example, 0.2 or more and less than 4. The gloss of the electroplating is preferably 0.3 or more and less than 3, and more preferably 0.6 or more and less than 2.5.

[0102] like Figure 7 and Figure 14 As shown, the first member 321 includes a concave recess 321e exposed at its first outer edge 321d. The first outer edge 321d is located at the portion where the first member 321 and the second member 322 intersect the stacking direction A and are exposed outward relative to the same width direction C. The first outer edge 321d is along the stacking direction X of the battery pack 1. The recess 321e is exposed outside the first member 321 relative to the direction (width direction C) intersecting the stacking direction A of the first and second members 322. Figure 9 As shown, the recess 321e is adjacent to the solid-phase joint 320A with respect to the width direction C. The recess 321e is adjacent to the solid-phase joint 320A in a state where it is separated from the solid-phase joint 320A.

[0103] like Figure 9As shown, the length of the recess 321e along the first outer edge 321d is greater than or equal to the length of the solid-state joint 320A along the first outer edge 321d. The entire area of ​​the recess 321e along the first outer edge 321d is opposite to the solid-state joint 320A in a direction intersecting the direction along the first outer edge 321d. The recess 321e of the first member 321 overlaps with the recess 322e of the second member 322 along the stacking direction of the first member 321 and the second member 322.

[0104] like Figure 10 As shown, the first member 321 includes a first protrusion 321g (protrusion) projecting outward from the recess 321e. The first protrusion 321g is a portion of the first member 321 deformed due to plastic deformation of the solid-state joint portion 320A when the first member 321 and the second member 322 are solidly joined. The first protrusion 321g is a portion that partially extends from the first member 321. The first protrusion 321g protrudes from the recess 321e toward the first outer edge 321d.

[0105] like Figure 9 and Figure 10 As shown, the tip of the first protrusion 321g of the first member 321 is located closer to the solid-state joint 320A than the first outer edge 321d, along a direction intersecting the stacking direction A of the first member 321 and the second member 322. The first protrusion 321g is located more inwardly than the first outer edge 321d, along a direction intersecting the stacking direction A (width direction C). The tip of the first protrusion 321g is received inside the recess 321e. The tip of the first protrusion 321g protrudes outward without extending beyond the first outer edge 321d, along a direction intersecting the stacking direction A (width direction C).

[0106] like Figure 10 As shown, the first protrusion 321g of the first member 321 is inclined from the base end side toward the top end side toward the second member 322 side. The top end side of the first protrusion 321g is located closer to the second member 322 side than the center (centerline D1) in the solid-phase joint 320A along the vibration direction B. The centerline D1 extends in a straight line along the width direction C and is orthogonal to the vibration direction B.

[0107] like Figure 9 and Figure 10 As shown, the first member 321 includes a second outer edge 321f that intersects with the first outer edge 321d. A second protrusion 321h protrudes from the second outer edge 321f of the first member 321 towards the second member 322 along the vibration direction B. Figure 7As shown, the second outer edge 321f is the edge on the top side extending from the first member 321 toward the second member 322 along a direction intersecting the lamination direction A (vibration direction B). The second protrusion 321h is opposite to the second member 322 along the lamination direction A.

[0108] like Figure 7 As shown, the first member 321 includes a second protrusion 321h projecting from the second outer edge 321f. (As...) Figure 9 and Figure 10 As shown, the second protrusion 321h is opposite to the second member 322 along the stacking direction A. The second protrusion 321h is a portion of the first member 321 deformed due to the plastic deformation of the solid-state joint portion 320A when the first member 321 and the second member 322 are solidly joined. The second protrusion 321h is a portion that extends partially from the first member 321.

[0109] (Second component 322)

[0110] like Figure 7 and Figure 8 As shown, the second component 322 includes a second mounting portion 322P, a second bending portion 322Q, and a second joining portion 322R. The second component 322 is integrally formed in the order of the second mounting portion 322P, the second bending portion 322Q, and the second joining portion 322R.

[0111] like Figure 2 As shown, the second mounting part 322P is mounted on the positive terminal 103 (electrode terminal) of the battery 100. Figure 7 and Figure 8 As shown, the second mounting portion 322P is formed in the shape of a plate. In the second mounting portion 322P, a mounting surface 322a, formed by the vibration direction B and a width direction C orthogonal to the vibration direction B, is mounted on the positive terminal 103. The second mounting portion 322P extends along the vibration direction B. The second mounting portion 322P may also have a through hole. For example, an inspection instrument can be inserted into the through hole of the second mounting portion 322P, and the inspection instrument can contact the positive terminal 103 to inspect the electrical characteristics of the battery 100. The corners of the second mounting portion 322P may be bent or formed as straight notches. The second mounting portion 322P can be laser-engaged with the positive terminal 103, for example.

[0112] The second bending portion 322Q is the portion that bends from the end of the second mounting portion 322P in the stacking direction A. The second bending portion 322Q is also the portion that bends from the end of the second joining portion 322R in the stacking direction A. For example... Figure 7 and Figure 8As shown, the second bent portion 322Q extends along the lamination direction A between the second joint portion 322R and the second mounting portion 322P. The second bent portion 322Q is orthogonal to the second mounting portion 322P and the second joint portion 322R. Figure 7 As shown, the second bending portion 322Q is formed in a plate shape. The first boundary 322b of the boundary portion between the second bending portion 322Q and the second mounting portion 322P is formed in an arc shape. The second boundary 322c of the boundary portion between the second bending portion 322Q and the second joining portion 322R is formed in an arc shape.

[0113] like Figure 7 and Figure 8 As shown, the second bend 322Q extends from one end to the other in the stacking direction A between the second joint 322R and the second mounting portion 322P. One end of the second bend 322Q is connected to the second mounting portion 322P. The other end of the second bend 322Q is connected to the second joint 322R. The shape of the second bend 322Q extending from one end to the other in the stacking direction A is such that after extending from one end to the other in the stacking direction A, it does not fold back from the other end to one end in the stacking direction A. That is, the overall shape of the second bend 322Q is not composed of a U-shape or the like. A U-shaped shape as an overall shape is equivalent to a shape that extends from one end to the other in the stacking direction A and then folds back from the other end to one end in the stacking direction A. The second bend 322Q may also be composed of a U-shape or the like as a part of its overall shape. That is, a portion of the region from one end of the second bend 322Q to the other end may also include a U-shape or the like. One end of the second bend 322Q and the other end of the second bend 322Q are not in the same position or are in relatively close positions along the stacking direction A.

[0114] The second bend 322Q positions the solid-state junction 320A differently from the junction with the positive terminal 103 of the battery 100. This position is relative to the positive terminal 103 or negative terminal 104 of the battery 100 along the height direction Z. Furthermore, the second bend 322Q suppresses the spring constant of the busbar 320. Specifically, the second bend 322Q alleviates stress on the busbar 320 caused by the expansion and contraction of the battery 100 or vibration of the battery pack 1. The longer the second bend 322Q is along the stacking direction A, the smaller the spring constant. The shorter the length of the second bend 322Q, the smaller its resistance.

[0115] The length of the second bend 322Q is, for example, 0.1 mm or more and 50 mm or less. The length of the second bend 322Q along the lamination direction A is preferably 1 mm or more and 20 mm or less, more preferably 2 mm or more and 10 mm or less. The angle of the second bend 322Q is 0 degrees relative to the lamination direction A and 90 degrees relative to the surface where the solid-state bonding portion 320A is provided. The angle of the second bend 322Q is preferably 30 degrees or more and 150 degrees or less, more preferably 45 degrees or more and 135 degrees or less. The magnitude of the bend R of the first boundary 322b and the second boundary 322c of the second bend 322Q is, for example, 0.001 mm or more and 8 mm or less. The magnitude of the bend R is preferably 0.01 mm or more and 4 mm or less, more preferably 0.1 mm or more and 2 mm or less.

[0116] like Figure 7 and Figure 8 As shown, the second joint 322R is connected to the second bend 322Q. The second joint 322R contacts the first member 321 in the lamination direction A. Figure 7 As shown, the second joint portion 322R is formed in the shape of a plate. In the second joint portion 322R, the surface formed by the vibration direction B and the width direction C orthogonal to the vibration direction B contacts the first member 321. The second joint portion 322R extends along the vibration direction B. The second joint portion 322R is not opposite to the second mounting portion 322P along the lamination direction A. The second joint portion 322R extends along the vibration direction B in a direction separating it from the second mounting portion 322P via the second bend portion 322Q. The second joint portion 322R is formed parallel to the second mounting portion 322P.

[0117] The thinner the second member 322, the more effectively it alleviates the stress on the solid-state junction 320A of the busbar 320. Conversely, the thicker the second member 322, the lower the resistance of the busbar 320. The thickness of the second member 322 is, for example, 0.1 mm or more and 3 mm or less. Preferably, the thickness of the second member 322 is 0.3 mm or more and 2 mm or less, more preferably 0.4 mm or more and 1.5 mm or less. The thickness of the second member 322 can also be partially reduced or increased.

[0118] The second component 322 is conductive. The second component 322 has a different rigidity than the first component 321. The hardness of the second component 322 is lower than that of the first component 321. The second component 322 may contain, for example, aluminum or an aluminum alloy. As an example, when the second component 322 is an aluminum alloy, an alloy from the 1000 series, 2000 series, 3000 series, 4000 series, 5000 series, 6000 series, 7000 series, or 8000 series is used. As an example, in the quenching and tempering of aluminum alloys, the second component 322 may be made of a material treated with any of the following: F, O, H, W, or T.

[0119] The second component 322 may also be electroplated (coated). The second component 322 is electroplated at least at the portion in solid-state contact with the first component 321. The electroplating performed on the second component 322 is the same as the electroplating performed on the first component 321.

[0120] like Figure 7 and Figure 14 As shown, the second member 322 includes a concave recess 322e exposed at the first outer edge 322d. The first outer edge 322d is located at the portion where the first member 321 and the second member 322 intersect the stacking direction A and are exposed outward relative to the same width direction C. The first outer edge 322d is along the stacking direction X of the battery pack 1. The recess 322e is exposed outside the second member 322 relative to the direction (width direction C) intersecting the stacking direction A of the first member 321. Figure 9 As shown, the recess 322e is adjacent to the solid-phase joint 320A with respect to the width direction C. The recess 322e is adjacent to the solid-phase joint 320A in a state where it is separated from the solid-phase joint 320A.

[0121] like Figure 9 As shown, the length of the recess 322e along the first outer edge 322d is greater than or equal to the length of the solid-state joint 320A along the first outer edge 322d. The entire area of ​​the recess 322e along the first outer edge 322d is opposite to the solid-state joint 320A in a direction intersecting the direction along the first outer edge 322d. The recess 322e of the second member 322 overlaps with the recess 321e of the first member 321 along the stacking direction of the first member 321 and the second member 322.

[0122] like Figure 9 As shown, the second member 322 includes a first protrusion 321g (protrusion) projecting outward from the recess 321e. The first protrusion 322g is a portion of the second member 322 deformed due to plastic deformation of the solid-state joint portion 320A when the first member 321 and the second member 322 are solidly joined. The first protrusion 322g is a portion that partially extends from the second member 322. The first protrusion 322g protrudes from the recess 322e toward the first outer edge 322d.

[0123] like Figure 9As shown, the tip of the first protrusion 322g of the second member 322 is located closer to the solid-state joint 320A than the first outer edge 322d, along a direction intersecting the stacking direction A of the first member 321 and the second member 322. The first protrusion 322g is located further inward than the first outer edge 322d, along a direction intersecting the stacking direction A (width direction C). The tip of the first protrusion 322g is accommodated inside the recess 322e. The tip of the first protrusion 322g protrudes outward without extending beyond the first outer edge 322d, along a direction intersecting the stacking direction A (width direction C).

[0124] like Figure 12 As shown, the first protrusion 322g of the second member 322 is inclined from the base end side toward the top end side toward the first member 321 side. The top end side of the first protrusion 322g is located closer to the first member 321 side than the center line D1 in the solid-phase joint 320A along the vibration direction B.

[0125] like Figure 11 and Figure 12 As shown, the second member 322 includes a second outer edge 322f that intersects the first outer edge 322d. A second protrusion 322h protrudes from the second outer edge 322f of the second member 322 toward the first member 321. Figure 7 As shown, the second outer edge 322f is the edge on the top side extending from the second member 322 toward the first member 321 along a direction intersecting the lamination direction A (vibration direction B). The second protrusion 322h is opposite to the first member 321 along the lamination direction A.

[0126] like Figure 7 As shown, the second member 322 includes a second protrusion 322h projecting from the second outer edge 322f. (As...) Figure 11 and Figure 12 As shown, the second protrusion 322h is opposite to the first member 321 along the stacking direction A. The second protrusion 322h is a portion of the second member 322 deformed due to the plastic deformation of the solid-state joint portion 320A when the first member 321 and the second member 322 are solidly joined. The second protrusion 322h is the portion that partially extends from the second member 322.

[0127] (Solid phase junction 320A of busbar 320)

[0128] Reference Figure 7 and Figure 8 The solid phase junction 320A of the busbar 320 will be described.

[0129] In the busbar 320, the first joint 321R of the first member 321 and the second joint 322R of the second member 322 include a solid-state joint 320A. The busbar 320 is solid-state joined at the first joint 321R of the first member 321 and the second joint 322R of the second member 322.

[0130] In the solid-state bonding of the first component 321 and the second component 322, ultrasonic bonding, for example, is used. In ultrasonic bonding, the stacked first component 321 and the second component 322 are bonded by applying pressure and vibration through a welding head and an anvil. In the solid-state bonding of the first component 321 and the second component 322, friction stirring bonding, in which the components are softened by frictional heat, can also be used.

[0131] like Figure 7 As shown, when viewed from the stacking direction A, the solid-phase joint 320A is, for example, formed in a rectangular shape. The long side of the solid-phase joint 320A is along the width direction C, which intersects the vibration direction B. The short side of the solid-phase joint 320A is along the vibration direction B. That is, as... Figure 7 As shown, in the rectangular solid-phase joint 320A, the length along the width direction C intersecting the vibration direction B is longer than the length along the vibration direction B. Alternatively, the solid-phase joint 320A may have its long side along the vibration direction B and its short side along the width direction C intersecting the vibration direction B. In this case, the length along the vibration direction B in the rectangular solid-phase joint 320A is longer than the length along the width direction C intersecting the vibration direction B. The solid-phase joint 320A may also be formed in a square shape. In this case, the length along the vibration direction B in the square solid-phase joint 320A is equal to the length along the width direction C intersecting the vibration direction B.

[0132] The solid-state joint 320A can also be circular, elliptical, parallelogram, trapezoidal, rhomboid, hexagonal, octagonal, or other polygonal shapes. The solid-state joint 320A can also be any geometric shape. The solid-state joint 320A can also be a shape formed by the largest region of a trajectory defined by sliding an arbitrary geometric shape in a linear or rotational direction. The solid-state joint 320A can also be a part of a shape formed by the largest region.

[0133] (The configuration of the second end busbar 330)

[0134] Reference Figure 1 , Figure 2 as well as Figure 5The configuration of the second end busbar 330 will be explained.

[0135] like Figure 2 As shown, the second end busbar 330, as an example, is connected to the negative terminal 104 of the battery 100 closest to the second end block 212 among the stacked 20 batteries 100. Figure 5 As shown, the second end busbar 330 has a first part 331 and a second part 332.

[0136] In the second end busbar 330, the first part 331 is connected to the negative terminal 104 of the battery 100. The first part 331 is a portion of the busbar that connects to electrical equipment and is connected to external control equipment. In the first end busbar 310, the first component 311 is connected to a busbar or wiring that is connected to external electrical equipment. The external electrical equipment is, for example, a relay or motor installed in an electric vehicle. The second end busbar 330 may also be configured to connect to a busbar that connects battery pack 1 in series or in parallel. An insertion hole 311i is formed on the second part 332. A fastening bolt is inserted into the insertion hole 332i. The second part 332 is connected to the busbar or wiring that is connected to external control equipment by the fastening bolt. The second part 332 is integrally formed with the first part 331. The second end busbar 330 is, for example, made of copper.

[0137] (Composition of busbar retainer 340 (retaining member))

[0138] like Figure 1 , Figure 5 and Figure 6 As shown, a bus holder 340 (holding member) integrally holds a first end bus 310, multiple buses 320, and a second end bus 330. Furthermore, the bus holder 340 covers the stacked multiple batteries 100, insulating surrounding components from the batteries 100. Figure 5 As shown, the busbar retainer 340 includes multiple openings 340a, multiple retaining portions 340c, multiple fixing portions 340b, and multiple insertion portions 340d. The busbar retainer 340 is formed in a plate shape.

[0139] like Figure 5 and Figure 6 As shown, multiple openings 340a expose the first or second joint of the first end busbar 310, multiple busbars 320, and the second end busbar 330 to the lower side in the height direction Z. In each opening 340a, the positive terminal 103 or the negative terminal 104 of the battery 100 is inserted to the upper side in the height direction Z.

[0140] like Figure 5 and Figure 6As shown, multiple fixing portions 340b hold the ends of the first or second joints of the first end busbar 310, multiple busbars 320, and the second end busbar 330. Each fixing portion 340b is formed on the edge of the opening 340a. Each fixing portion 340b has a groove that is straight along the surface of the busbar holder 340. The ends of the first or second joints of the corresponding busbars are inserted into the grooves provided in each fixing portion 340b. The shape of the fixing portion 340b is not limited as long as it holds the shape of the busbar 320, the first end busbar 310, and the second end busbar 330.

[0141] like Figure 5 and Figure 6 As shown, a plurality of retaining portions 340c are formed on the edges of both sides of the opening 340a in the width direction Y. Each retaining portion 340c extends along the stacking direction X. The retaining portions 340c retain the first end busbar 310 along the first outer edge of the first member 311 and the first outer edge of the second member 312. A pair of retaining portions 340c retain the busbar 320 such that it clamps the first end busbar 310 from both sides in the width direction Y. The retaining portions 340c retain the busbar 320 along the first outer edge 321d of the first member 321 and the first outer edge 322d of the second member 322. A pair of retaining portions 340c retain the busbar 320 such that it clamps the busbar 320 from both sides in the width direction Y. The retaining portion 340c holds the second end busbar 330 along the first outer edge of the first portion 331 and the first outer edge of the second portion 332 of the second end busbar 330. A pair of retaining portions 340c hold the busbar 320 such that they clamp the second end busbar 330 from both sides in the width direction Y. The shape of the retaining portion 340c is not limited as long as it is a shape that holds the busbar 320, the first end busbar 310 and the first outer edge of the second end busbar 330.

[0142] like Figure 1 and Figure 2 As shown, wires 502 of temperature measuring units 500 are inserted into multiple insertion parts 340d.

[0143] (Composition of voltage detection unit 400)

[0144] Figure 1 , Figure 2 , Figure 5 and Figure 6 The voltage detection unit 400 shown detects the voltage of the battery 100, for example, based on control from an external control device. Figure 5As shown, the voltage detection unit 400 includes a voltage detection terminal 401 and a wire 402. The configuration of the voltage detection unit 400 will be described below.

[0145] like Figure 5 As shown, the voltage detection terminal 401 is conductive and is formed in the shape of a plate. The voltage detection terminal 401 is respectively connected to the first end bus 310, the plurality of buses 320 and the second end bus 330 of the bus unit 300.

[0146] like Figure 5 As shown, wire 402 is connected to voltage detection terminal 401. Wire 402 connects voltage detection terminal 401 to external control equipment.

[0147] (Composition of temperature measuring unit 500)

[0148] Figure 1 , Figure 2 and Figure 5 The temperature measuring unit 500 shown measures the temperature of the battery 100, for example, based on control from an external control device. Figure 2 As shown, the temperature measuring unit 500 includes a temperature sensor 501 and a wire 502. The configuration of the temperature measuring unit 500 will be described below.

[0149] Temperature sensor 501 measures the temperature of battery 100. For example... Figure 2 As shown, temperature sensor 501 is attached, as an example, to the cover 102 of the 7th and 14th batteries 100 located from the first end block 211 to the second end block 212.

[0150] like Figure 2 As shown, wire 502 is mounted on temperature sensor 501. Wire 502 connects temperature sensor 501 to external control equipment.

[0151] (Effects of the busbar 320 and battery pack 1 in the first embodiment)

[0152] Reference Figure 1 , Figure 2 as well as Figures 5 to 14 The effects of the busbar 320 and the battery pack 1 in the first embodiment will be explained.

[0153] (1) such as Figure 7 and Figure 10As shown, the busbar 320 has a first member 321 and a second member 322 stacked on top of the first member 321. The first member 321 and the second member 322 include a solid-state bond portion 320A formed by solid-state bonding. The first member 321 includes a concave recess 321e exposed at a first outer edge 321d (outer edge). The second member 322 includes a concave recess 322e exposed at a first outer edge 322d (outer edge). The recesses 321e and 322e are adjacent to the solid-state bond portion 320A. In a first embodiment, both the first member 321 and the second member 322 include recesses. In this invention, it is sufficient if at least one of the first member 321 and the second member 322 includes a recess.

[0154] (19) such as Figure 1 and Figure 2 As shown, the battery pack 1 has a battery 100 and a busbar 320 connected to the battery 100.

[0155] According to this configuration, in the busbar 320 formed by solid-state bonding of the first member 321 and the second member 322 (two or more members), the influence of the solid-state bonding portion 320A on the external dimensions of the busbar 320 can be suppressed or prevented by the recesses 321e and 322e. As a result, the busbar 320 can meet the allowable dimensions based on design values. That is, a busbar 320 in which the upper limit of the external dimensions of the first member 321 and the second member 322 (two or more members) meets the specified range when the first member 321 and the second member 322 (two or more members) are solid-state bonded can be obtained. In addition, according to this configuration, a battery pack 1 having the above-described busbar 320 can be obtained. The configuration and effect of the busbar 320 can also be applied to the first end busbar 310. The deformation of a portion of the first member 321 or the second member 322 is caused by the influence of the solid-state joint 320A on the external dimensions of the busbar 320, for example, when the first member 321 and the second member 322 are solid-state joined, due to the plastic deformation of the solid-state joint 320A. This partial deformation occurs when a portion of the solid-state joint 320A is extruded towards the recess 321e or recess 322e during its formation.

[0156] (2) such as Figure 7 and Figure 9 As shown, in the busbar 320, the recess 321e of the first member 321 and the recess 322e of the second member 322 are adjacent when separated from the solid-state joint 320A. In the first embodiment, the two recesses of the first member 321 and the second member 322 are adjacent when separated from the solid-state joint 320A. In the present invention, it is sufficient that the recesses of at least one of the first member 321 and the second member 322 are adjacent when separated from the solid-state joint 320A.

[0157] With this configuration, when forming the solid-phase joint 320A, even if the area between the recess 321e of the first member 321 and the solid-phase joint 320A is squeezed towards the recess 321e, it can be absorbed by the space inside the recess 321e. Furthermore, with this configuration, when forming the solid-phase joint 320A, even if the area between the recess 322e of the second member 322 and the solid-phase joint 320A is squeezed towards the recess 322e, it can be absorbed by the space inside the recess 322e.

[0158] (3) such as Figure 7 and Figure 10 As shown, in the busbar 320, the first member 321 includes a first protrusion 321g (protrusion) projecting outward from the recess 321e. The second member 322 includes a first protrusion 322g (protrusion) projecting outward from the recess 322e. In the first embodiment, both the first member 321 and the second member 322 include protrusions projecting outward from the recess. In this invention, it is sufficient that at least one of the first member 321 and the second member 322 includes a protrusion projecting outward from the recess.

[0159] The first protrusion 321g of the first member 321 is a portion of the first member 321 deformed due to plastic deformation of the solid-state joint 320A when the first member 321 and the second member 322 are solidly joined. The first protrusion 321g extends partially from the recess 321e of the first member 321. The first protrusion 322g of the second member 322 is a portion of the second member 322 deformed due to plastic deformation of the solid-state joint 320A when the first member 321 and the second member 322 are solidly joined. The first protrusion 322g extends partially from the recess 322e of the second member 322.

[0160] With this configuration, in the first member 321, for the first protrusion 321g protruding from the recess 321e, since the recess 321e is located closer to the inside of the first member 321 than the first outer edge 321d, it is difficult for it to protrude beyond the first outer edge 321d to the outside of the first member 321. Similarly, with this configuration, in the second member 322, for the first protrusion 322g protruding from the recess 322e, since the recess 322e is located closer to the inside of the second member 322 than the first outer edge 322d, it is difficult for it to protrude beyond the first outer edge 322d to the outside of the second member 322. As a result, the busbar 320 can satisfy the upper limit of its external dimensions within a specified range.

[0161] (4) such as Figure 7 and Figure 10As shown, in the busbar 320, the top end of the first protrusion 321g (protrusion) of the first member 321 is located closer to the solid-state joint 320A than the first outer edge 321d, along the direction (width direction C) intersecting the stacking direction A of the first member 321 and the second member 322. Figure 7 and Figure 10 As shown, the top tip of the first protrusion 322g (protrusion) of the second member 322 is located closer to the solid-state joint 320A than the first outer edge 322d, along a direction (width direction C) intersecting the stacking direction A of the first member 321 and the second member 322. In the first embodiment, both the first member 321 and the second member 322 are formed with the above configuration. In the present invention, it is sufficient that at least one of the first member 321 and the second member 322 is formed with the above configuration.

[0162] With this configuration, interference between the busbar 320 and surrounding components can be effectively prevented. The surrounding components include, for example, the retaining portion 340c in the busbar retainer 340, which extends Z in the height direction.

[0163] (5) such as Figure 10 As shown, in the busbar 320, the first protrusion 321g of the first member 321 is inclined from the base end side toward the top end side toward the second member 322 side. Figure 10 As shown, the first protrusion 322g of the second member 322 is inclined towards the first member 321 from the base end side toward the top end side. In the first embodiment, both the first member 321 and the second member 322 are formed with the above configuration. In the present invention, it is also possible for the first member 321 and the second member 322 to be square in the above configuration.

[0164] This configuration, in the first member 321, illustrates an example of the deformed state of the first protrusion 321g caused by the plastic deformation of the solid-state joint 320A. In the first member 321, the first joint 321R has a first bend 321Q on the base end side, but no structure on the top end side. The top end side of the first joint 321R is the side where the second outer edge 321f is located. In the first joint 321R, the top end side without any structure is relatively easier to deform than the base end side with the first bend 321Q. When the first member 321 and the second member 322 are solid-state joined, the first protrusion 321g is formed to be inclined toward the top end side because it is easier to deform and protrude toward the top end side than the base end side. When the first protrusion 321g is formed inclined in the recess 321e, the protrusion length of the first protrusion 322g relative to the width direction C can be reduced in the recess 321e. Furthermore, in the second member 322, such a configuration shows an example of the deformation state of the first protrusion 322g caused by the plastic deformation of the solid-phase joint 320A.

[0165] (6) For example Figure 7 and Figure 10 As shown, the length of the recess 321e of the first member 321 along the first outer edge 321d is greater than or equal to the length of the solid-state joint 320A along the first outer edge 321d. The entire area of ​​the recess 321e along the first outer edge 321d is opposite to the solid-state joint 320A in a direction intersecting the direction along the first outer edge 321d. Figure 7 and Figure 10 As shown, the length of the recess 322e of the second member 322 along the first outer edge 322d is greater than or equal to the length of the solid-state joint 320A along the first outer edge 322d. The entire area of ​​the recess 322e along the first outer edge 322d is opposite to the solid-state joint 320A in a direction intersecting the direction along the first outer edge 322d. In the first embodiment, both the first member 321 and the second member 322 are formed with the above configuration. In the present invention, it is sufficient that at least one of the first member 321 and the second member 322 is formed with the above configuration.

[0166] With this configuration, the recess 321e of the first member 321 and the recess 322e of the second member 322 are arranged adjacent to the solid-state joint 320A along the vibration direction B. Furthermore, the width of the recess 321e of the first member 321 and the recess 322e of the second member 322 along the vibration direction B is longer than that of the solid-state joint 320A. Therefore, deformation of the recesses 321e of the first member 321 and the recesses 322e of the second member 322 caused by plastic deformation of the solid-state joint 320A can be adequately addressed.

[0167] (7) For example Figure 7 As shown, in the busbar 320, the first component 321 and the second component 322 each include a recess.

[0168] According to this configuration, the influence of the solid phase joint 320A on the external dimensions of the busbar 320 can be suppressed or prevented by both the recess 321e of the first member 321 and the recess 322e of the second member 322.

[0169] (8) such as Figure 10 As shown, the recess 321e of the first component 321 and the recess 322e of the second component 322 overlap along the stacking direction of the first component 321 and the second component 322. In the first embodiment, the recess 321e of the first component 321 and the recess 322e of the second component 322 completely overlap within the range of manufacturing tolerances. In the present invention, it is sufficient that the recess 321e of the first component 321 and the recess 322e of the second component 322 at least partially overlap.

[0170] Based on this configuration, the influence of the solid phase joint 320A on the external dimensions of the busbar 320 can be suppressed or prevented in the same single area.

[0171] (9) such as Figure 9 As shown, in the busbar 320, the first member 321 includes a second outer edge 321f intersecting the first outer edge 321d, and a second protrusion 321h protruding from the second outer edge 321f. The second protrusion 321h of the first member 321 protrudes from the second outer edge 321f of the first member 321 towards the second member 322 along the vibration direction B. Figure 11 As shown, the second member 322 includes a second outer edge 322f intersecting the first outer edge 322d, and a second protrusion 322h protruding from the second outer edge 322f. The second protrusion 322h of the second member 322 protrudes from the second outer edge 322f toward the first member 321. In the first embodiment, both the first member 321 and the second member 322 are formed with the above configuration. In the present invention, it is sufficient that at least one of the first member 321 and the second member 322 is formed with the above configuration.

[0172] The second protrusion 321h of the first member 321 is a portion of the first member 321 deformed due to plastic deformation of the solid-state joint 320A when the first member 321 and the second member 322 are solidly joined. The second protrusion 321h extends partially from the first member 321. In the first embodiment, the second protrusion 322h of the second member 322 is a portion of the second member 322 deformed due to plastic deformation of the solid-state joint 320A when the first member 321 and the second member 322 are solidly joined. The second protrusion 322h extends partially from the second member 322.

[0173] With this configuration, the effects caused by the solid-state joint 320A can be dispersed in the busbar 320 formed by solid-state bonding of the first member 321 and the second member 322. Specifically, in the first member 321, when the second protrusion 321h is formed, the size of the first protrusion 321g protruding from the recess 321e relative to the width direction C may be reduced. Furthermore, in the second member 322, when the second protrusion 322h is formed, the size of the first protrusion 322g protruding from the recess 322e relative to the width direction C may be reduced.

[0174] (20) such as Figure 6 As shown, the battery pack 1 has a bus holder 340 (holding member). The bus holder 340 contacts the first outer edge 321d (outer edge) of the first member 321 and the first outer edge 322d (outer edge) of the second member 322 of the bus 320, holding the bus 320. The bus holder 340 contacts the first outer edge (outer edge) of the first member 311 and the first outer edge (outer edge) of the second member 312 of the first end bus 310, holding the first end bus 310. In a first embodiment, for example, both the first outer edge 321d and the first outer edge 322d of the bus 320 are held by the bus holder 340. In the present invention, for example, it is sufficient that at least one of the first outer edge 321d and the first outer edge 322d of the bus 320 is held by the bus holder 340.

[0175] With this configuration, for example, when the busbar 320 is installed onto the busbar holder 340, interference between the holding portion 340c of the busbar holder 340 and the first outer edge 321d of the first member 321 of the busbar 320 can be suppressed or prevented. Furthermore, with this configuration, interference between the holding portion 340c of the busbar holder 340 and the first outer edge 322d of the second member 322 of the busbar 320 can be suppressed or prevented.

[0176] (Bus 610 in the second embodiment)

[0177] (The configuration of the busbar 610 in the second embodiment)

[0178] Reference Figure 15 and Figure 16 The composition of busbar 610 is explained.

[0179] Figure 15 This is a top view showing the main part of the bus 610 of the second embodiment. Figure 16 It is shown Figure 15 A bottom view of busbar 610.

[0180] The recess 611e of the first member 611 continuously narrows in the width direction C towards the second member 612. That is, the recess 611e continuously narrows in the width direction C from the base end 611e1 side to the top end 611e2 side. The recess 611e is inclined towards the inside of the busbar 610 towards the second member 612 side. The recess 611e is formed along the vibration direction B of the first mounting portion 611P. The recess 611e is formed along the vibration direction of the first bending portion 611Q and the first joining portion 611R. The recess 611e corresponds to the configuration of the first outer edge 321d being cut in an inclined shape in the first bending portion 611Q and the first joining portion 611R. Due to the pair of inclined recesses 611e, the first joining portion 611R is formed into a trapezoidal shape that is relatively smaller towards the second member 612 side.

[0181] Due to the recess 611e, the width direction C of the first member 611 narrows towards the top of the first member 611. The top of the first member 611 is the side of the second outer edge 611f. A first protrusion 611g (protrusion) is formed on the recess 611e. The second outer edge 611f slopes in a straight line from both sides of the width direction C of the first member 611 towards the center. The second outer edge 611f forms two inclined planes in an isosceles triangle. The second outer edge 611f may also be non-symmetrical along the width direction C. Second protrusions 611h are formed on each inclined plane of the second outer edge 611f.

[0182] The recess 612e of the second member 612 continuously narrows in the width direction C towards the first member 611. That is, the recess 612e continuously narrows in the width direction C from the base end 612e1 side to the top end 612e2 side. The recess 612e is inclined towards the inside of the busbar 610 towards the first member 611 side. The recess 612e is formed along the vibration direction B of the second mounting portion 612P. The recess 612e is formed along the vibration direction of the second bending portion 612Q and the second joining portion 612R. The recess 612e corresponds to the configuration of an inclined cut in the first outer edge 312d in the second bending portion 612Q and the second joining portion 612R. Due to the pair of inclined recesses 612e, the second joining portion 612R is formed into a trapezoidal shape that is relatively smaller towards the first member 611 side.

[0183] Due to the recess 612e, the width direction C of the second member 612 narrows towards the top of the second member 612. The top of the second member 612 is the side of the second outer edge 612f. A first protrusion 612g (protrusion) is formed on the recess 612e. The second outer edge 612f slopes in a straight line from both sides of the width direction C of the second member 612 towards the center. The second outer edge 612f forms two inclined planes in an isosceles triangle. The second outer edge 612f may also be non-symmetrical along the width direction C. Second protrusions 612h are formed on each inclined plane of the second outer edge 612f.

[0184] (Effect of bus 610 in the second embodiment)

[0185] Reference Figure 15 and Figure 16 The effect of busbar 610 is explained.

[0186] (10) In the busbar 610, the recess 611e of the first member 611 is formed in a width direction C that continuously narrows from the first member 611 toward the second member 612 and intersects with the first outer edge 611d. In this invention, it is sufficient that the recess 611e of the first member 611 includes a portion in which the width is relatively narrowed from the first member 611 toward the second member 612 and intersects with the first outer edge 611d. The recess 611e of the second member 612 is formed in a width direction C that continuously narrows from the second member 612 toward the first member 611 and intersects with the first outer edge 612d. In this invention, it is sufficient that the recess 612e of the second member 612 includes a portion in which the width is relatively narrowed from the second member 612 toward the first member 611 and intersects with the first outer edge 612d. In this invention, it is sufficient that the recess of either the first member or the second member has the above-described configuration.

[0187] This configuration is an example of the deformation state of the first protrusion 611g in the first member 611, taking into account the plastic deformation caused by the solid-state joint 320A. In the first member 611, the first joint 611R has a first bend 611Q on the base end side, but no structure on the top end side. The top end side of the first joint 611R is the side where the second outer edge 611f is located. In the first joint 611R, the top end side without any structure is relatively easier to deform than the base end side with the first bend 611Q. That is, when the first member 611 and the second member 612 are solid-state joined, the first protrusion 611g in the first joint 611R is easier to protrude at the top end 611e2 than at the base end 611e1 side of the recess 611e. Therefore, the recess 611e continuously narrows in the width direction C from the base end 611e1 side toward the top end 611e2 side. Furthermore, this configuration is an example of the deformation state of the first protrusion 612g in the second member 612, which takes into account the plastic deformation caused by the solid-phase joint 320A.

[0188] (Bus 620 in the third embodiment)

[0189] (The configuration of the busbar 620 in the third embodiment)

[0190] Reference Figure 17 and Figure 18 The composition of busbar 620 will be explained.

[0191] Figure 17 This is a top view showing the main parts of the bus 620 according to the third embodiment. Figure 18 It is shown Figure 17 A bottom view of the 620 busbar.

[0192] The recess 621e of the first component 621 is to be Figure 9 and Figure 10 The recess 321e of the first member 321 shown is curved inwards towards the inside of the first member 621. The inside of the first member 621 is the solid-phase joint 320A side. The recess 621e is concave towards the center of the solid-phase joint 320A. The center of the solid-phase joint 320A is the center (centerline D1) of the solid-phase joint 320A along the vibration direction B. The centerline D1 extends linearly along the width direction C and is orthogonal to the vibration direction B. Figure 17As shown, the recess 621e is formed in an arc shape. The most recessed area of ​​the recess 621e overlaps with the center line D1. The recess 621e curves towards the center of the solid-state joint 320A. The recess 621e is inclined and recessed towards the center of the solid-state joint 320A. The recess 621e may also be inclined and recessed towards the center of the solid-state joint 320A. The inclined and recessed recess is, for example, formed by two sides and recessed in a straight line towards the center of the solid-state joint 320A. The first protrusion 621g (protrusion) protrudes from the center of the recess 321e towards the first outer edge 321d. The tip of the first protrusion 621g is located along the width direction C on the side closer to the solid-state joint 320A than the first outer edge 321d.

[0193] The second outer edge 621f of the first component 621 is to be Figure 9 and Figure 10 The second outer edge 321f of the first member 321 shown is curved toward the center of the solid-phase joint 320A. The second outer edge 321f is concave toward the center of the solid-phase joint 320A. The center of the solid-phase joint 320A is the center (centerline D2) along the width direction C. The centerline D2 extends linearly along the vibration direction B and is orthogonal to the width direction C. Figure 17 As shown, the second outer edge 621f is formed in an arc shape. The most concave region of the second outer edge 621f overlaps with the center line D2. The second outer edge 621f bends toward the center of the solid-phase joint 320A. The second outer edge 621f may also be inclined toward the center of the solid-phase joint 320A and be concave. The second protrusion 621h protrudes from the second outer edge 621f along the vibration direction B toward the second member 622.

[0194] The recess 622e of the second component 622 is to be Figure 9 and Figure 10 The recess 322e of the second member 322 shown is curved inwards towards the inside of the second member 622. The inside of the second member 622 is the solid-state joint 320A side. The recess 622e is concave towards the center of the solid-state joint 320A. Figure 18 As shown, the recess 622e is formed in an arc shape. The most recessed area of ​​the recess 622e overlaps with the center line D1. The recess 622e curves towards the center of the solid-state joint 320A. The recess 622e is inclined and recessed towards the center of the solid-state joint 320A. The recess 622e may also be inclined and recessed towards the center of the solid-state joint 320A. The inclined and recessed recess is, for example, formed by two sides and recessed in a straight line towards the center of the solid-state joint 320A. The first protrusion 622g (protrusion) protrudes from the center of the recess 621e towards the first outer edge 322d. The tip of the first protrusion 622g is located along the width direction C on the side closer to the solid-state joint 320A than the first outer edge 322d.

[0195] The second outer edge 622f of the second component 622 is to be Figure 9 and Figure 10 The second outer edge 622f of the second member 622 shown is curved toward the center of the solid-phase joint 320A. The second outer edge 622f is concave toward the center of the solid-phase joint 320A. The center of the solid-phase joint 320A is the center (centerline D2) along the width direction C of the solid-phase joint 320A. Figure 18 As shown, the second outer edge 622f is formed in an arc shape. The most concave region of the second outer edge 622f overlaps with the center line D2. The second outer edge 622f bends toward the center of the solid-phase joint 320A. The second outer edge 622f may also be inclined toward the center of the solid-phase joint 320A and be concave. The second protrusion 622h protrudes from the second outer edge 622f along the vibration direction B toward the first member 621.

[0196] (Effect of bus 620 in the third embodiment)

[0197] Reference Figure 17 and Figure 18 The effect of busbar 620 is explained.

[0198] (11) The recess 621e of the first member 621 is bent and recessed toward the center (centerline D1) of the solid-state joint 320A. The recess 621e of the first member 621 may also be configured to include a portion recessed toward the center of the solid-state joint 320A, that is, a partially recessed configuration. The recess 622e of the second member 622 is bent and recessed toward the center of the solid-state joint 320A. The recess 622e of the second member 622 may also be configured to include a portion recessed toward the center (centerline D1) of the solid-state joint 320A, that is, a partially recessed configuration. It is also possible that only the recess of one of the first member 621 or the second member 622 has the above-described configuration.

[0199] According to this configuration, the influence of the solid-state joint 320A on the external dimensions of the busbar 620 can be suppressed or prevented by the recess 621e of the first member 621. The influence of the solid-state joint 320A on the external dimensions of the busbar 620 is, for example, the deformation of a portion of the first member 621 or the second member 622 caused by plastic deformation of the solid-state joint 320A during the solid-state joint of the first member 621 and the second member 622. This partial deformation occurs when a portion of the solid-state joint 320A is extruded towards the recess 621e or the recess 622e during its formation. For example, this partial deformation is the first protrusion 621g. The recess 621e of the first member 621 bends and recesses towards the center (centerline D1) of the solid-state joint 320A. Therefore, even if the center (centerline D1) of the solid-phase joint 320A deforms relatively significantly, the influence on the external dimensions of the busbar 620 caused by the deformation of a portion of the solid-phase joint 320A can be suppressed or prevented. The effect of the recess 622e in the second member 622 is the same as the effect of the recess 621e in the first member 621.

[0200] (Bus 630 of the fourth embodiment)

[0201] (The configuration of the busbar 630 in the fourth embodiment)

[0202] Reference Figure 19 The composition of busbar 630 will be explained.

[0203] Figure 19 This is a perspective view showing the main parts of the busbar 630 according to the fourth embodiment.

[0204] In the first member 631, the recess 321e and the second outer edge 321f are adjacent to each other, separated by a recess 631m that is recessed toward the solid-state joint 320A. The recess 631m is formed by inclined surfaces that are inclined relative to the first outer edge 321d and the second outer edge 321f, respectively. The recess 631m may also be formed by bending into an arc shape toward the solid-state joint 320A.

[0205] In the second member 632, the recess 322e and the second outer edge 322f are adjacent to each other, separated by a recess 632m that is recessed toward the solid-state joint 320A. The recess 632m is formed by inclined surfaces that are inclined relative to the first outer edge 322d and the second outer edge 322f, respectively. The recess 632m may also be formed by bending into an arc shape toward the solid-state joint 320A.

[0206] (Effect of busbar 630 in the fourth embodiment)

[0207] Reference Figure 19 The effect of busbar 630 is explained.

[0208] (12) In the first member 631, the recess 321e and the second outer edge 321f are adjacent to each other, separated by a recess 631m that is recessed toward the solid-state joint 320A. In the second member 632, the recess 322e and the second outer edge 322f are adjacent to each other, separated by a recess 632m that is recessed toward the solid-state joint 320A. Alternatively, only one of the first member 631 or the second member 632 may have the above configuration.

[0209] With this configuration, in the first member 631, the first protrusion 321g or the second protrusion 321h protruding from the solid-state joint 320A can be suppressed or prevented from protruding outward from the boundary portion of the recess 321e and the second outer edge 321f beyond the first outer edge 321d. Due to the presence of the recess 631m, the distance to the first outer edge 321d becomes relatively longer. The effect of the recess 632m in the second member 632 is the same as the effect of the recess 631m in the first member 631.

[0210] (Bus 640 in the fifth embodiment)

[0211] (The configuration of the busbar 640 in the fifth embodiment)

[0212] Reference Figure 20 The composition of busbar 640 will be explained.

[0213] Figure 20 This is a perspective view showing the main parts of the busbar 640 according to the fifth embodiment.

[0214] In the first member 641, the outer edge 641d of the portion opposite the recess 641e in the direction intersecting the lamination direction A is inclined from the lamination direction A. The outer edge 641d of the first member 641 is inclined toward the solid-state joint 320A of the first member 641 relative to the direction away from the second member 642 along the lamination direction. The second outer edge 641f of the first member 641 is also inclined toward the solid-state joint 320A of the first member 641 relative to the direction away from the second member 642 along the lamination direction. The outer edge 641d and the second outer edge 641f of the first member 641 may also be inclined toward the side away from the solid-state joint 320A of the first member 641 relative to the direction away from the second member 642 along the lamination direction.

[0215] In the second member 642, the outer edge 642d of the portion opposite the recess 642e in the direction intersecting the lamination direction A is inclined from the lamination direction A. The outer edge 642d of the second member 642 is inclined towards the solid-state joint 320A of the second member 642 relative to the direction away from the first member 641 along the lamination direction. The second outer edge of the second member 642 is also inclined towards the solid-state joint 320A of the second member 642 relative to the direction away from the first member 641 along the lamination direction. The outer edge 642d and the second outer edge of the second member 642 may also be inclined away from the solid-state joint 320A of the second member 642 relative to the direction away from the first member 641 along the lamination direction.

[0216] (Effect of bus 640 in the fifth embodiment)

[0217] Reference Figure 20 The effect of busbar 640 is explained.

[0218] (13) In the first member 641, the side surface 641e1 of the recess 641e is inclined from the stacking direction A of the first member 641 and the second member 642 toward the solid-state joint 320A. In the second member 642, the side surface 642e1 of the recess 642e is inclined from the stacking direction A of the first member 641 and the second member 642 toward the solid-state joint 320A. The outer edge 641d of the portion opposite to the recess 641e in at least the direction intersecting with the stacking direction A is inclined from the stacking direction A. In the second member 642 having the recess 642e, the outer edge 642d of the portion opposite to the recess 642e in at least the direction intersecting with the stacking direction A is inclined from the stacking direction A. It is also possible that only for one of the first member 641 or the second member 642, the outer edge of the portion opposite to the recess in at least the direction intersecting with the stacking direction A is inclined from the stacking direction A.

[0219] With this configuration, in the inclined recess 641e of the first member 641, the first protrusion 641g protruding from the solid-state joint 320A can be suppressed or prevented from protruding outward beyond the first outer edge 321d. The effect of the recess 642e in the second member 642 is the same as the effect of the recess 641e in the first member 641.

[0220] (Bus 650 of the sixth embodiment)

[0221] (The configuration of the busbar 650 in the sixth embodiment)

[0222] Reference Figure 21 The composition of bus 650 is explained.

[0223] Figure 21This is a perspective view showing the main parts of the bus 650 according to the sixth embodiment.

[0224] The first member 651 includes a recess 651e in the region where the first member 651 and the second member 652 are stacked. The recess 651e is formed only in the first joint portion 321R of the first member 651, which includes the first mounting portion 321P, the first bending portion 321Q, and the first joining portion 321R. The second member 652 also includes a recess 652e in the region where the first member 651 and the second member 652 are stacked. The recess 652e is formed only in the second joint portion 322R of the second member 652, which includes the second mounting portion 322P, the second bending portion 322Q, and the second joining portion 322R.

[0225] (Effect of bus 650 in the sixth embodiment)

[0226] Reference Figure 21 The effect of bus 650 is explained.

[0227] The first member 651 includes a recess 651e in at least the region where the first member 651 and the second member 652 are stacked. The second member 652 includes a recess 652e in at least the region where the first member 651 and the second member 652 are stacked. Alternatively, at least one of the first member 651 and the second member 652 may include a recess in the aforementioned region.

[0228] With this configuration, the size of the recess 651e in the first member 651 can be relatively reduced. By providing the recess 651e only in the aforementioned stacked region, its size can be reduced compared to the case where the recess extends from the first mounting portion 321P throughout the aforementioned stacked region. The effect of the recess 652e in the second member 652 is the same as that of the recess 651e in the first member 651. By providing the recess 652e only in the aforementioned stacked region, its size can be reduced compared to the case where the recess extends from the second mounting portion 322P throughout the aforementioned stacked region.

[0229] (Bus 660 in the seventh embodiment)

[0230] (The configuration of the busbar 660 in the seventh embodiment)

[0231] Reference Figure 22 The composition of bus 660 will be explained.

[0232] Figure 22 This is a top view showing the main parts of the bus 660 according to the seventh embodiment.

[0233] The top end of the first protrusion 662g of the second member 662 protrudes beyond the first outer edge 322d along a direction intersecting the stacking direction A (width direction C). The first protrusion 662g is larger than the first protrusion 661g of the first member 661. The first protrusion 662g protrudes outward from the recess 322e along the width direction C.

[0234] (Effect of bus 660 in the seventh embodiment)

[0235] Reference Figure 22 The effects of bus 660 will be explained.

[0236] (14) The top end of the first protrusion 662g of the second member 662 protrudes beyond the first outer edge 322d (outer edge) along the direction intersecting the stacking direction A (width direction C). Alternatively, the first protrusion 661g of the first member 661 may protrude beyond the first outer edge 321d along the direction intersecting the stacking direction A (width direction C).

[0237] According to this configuration, the increase in the external dimensions of the second member 662 caused by the first protrusion 662g of the second member 662 can be suppressed or prevented by the recess 322e.

[0238] (Bus 670 in the eighth embodiment)

[0239] (The configuration of the busbar 670 in the eighth embodiment)

[0240] Reference Figure 23 The composition of busbar 670 will be explained.

[0241] Figure 23 This is a top view showing the main part of the bus 670 according to the eighth embodiment.

[0242] The most protruding portion of the first protrusion 671g of the first member 671 corresponds to the center of the solid-state joint 320A. The first protrusion 671g is formed in a normally distributed shape along the vibration direction B. The first protrusion 671g is symmetrically formed with an axis of symmetry that bisects the solid-state joint 320A in the width direction C (the central axis of the solid-state joint 320A). The most protruding portion of the second protrusion 672g of the second member 672 corresponds to the center of the solid-state joint 320A. The second protrusion 672g is formed in a normally distributed shape along the vibration direction B. The second protrusion 672g is symmetrically formed with an axis of symmetry that bisects the solid-state joint 320A in the width direction C (the central axis of the solid-state joint 320A).

[0243] (Effect of busbar 670 in the eighth embodiment)

[0244] Reference Figure 23 The effect of busbar 670 is explained.

[0245] (19) The most protruding part of the first protrusion 671g of the first member 671 corresponds to the center of the solid-phase joint 320A. The most protruding part of the second protrusion 672g of the second member 672 corresponds to the center of the solid-phase joint 320A. Alternatively, only one of the first member 671 or the second member 672 may be configured as described above.

[0246] With this configuration, in the first member 671, the shape can be adapted such that the most protruding part of the first protrusion 671g of the first member 671 corresponds to the center of the solid-phase joint 320A. The effect of the second protrusion 672g in the second member 672 is the same as the effect of the first protrusion 671g in the first member 671.

[0247] (Bus 680 in the ninth embodiment)

[0248] (The configuration of the busbar 680 in the ninth embodiment)

[0249] Reference Figure 24 The composition of bus 680 will be explained.

[0250] Figure 24 This is a top view showing the main parts of the bus 680 according to the ninth embodiment.

[0251] The length of the recess 681e of the first member 681 along its first outer edge 681d is less than the length of the solid-state joint 320A along its outer edge. The entire area of ​​the recess 681e along its first outer edge 681d is opposite to the solid-state joint 320A in a direction intersecting the direction along the first outer edge 681d (width direction c). Compared to the solid-state joint 320A, which is opposite to the first outer edge 681d of the first member 681 in a direction intersecting the lamination direction A (width direction C), the length of the recess 681e of the first member 681 along its first outer edge 681d is smaller. The recess 681e of the first member 681 being smaller than the solid-state joint 320A means that, in the portion where the recess 681e and the solid-state joint 320A are opposite in the width direction C, there exists a region where the recess 681e is absent but the solid-state joint 320A is present. The recess 681e is formed only in the first joint portion 321R among the first mounting portion 321P, the first bending portion 321Q and the first joining portion 321R of the first member 681.

[0252] The length of the recess 682e of the second member 682 along the first outer edge 682d is less than the length of the solid-state joint 320A along its outer edge. The entire area of ​​the recess 682e along the first outer edge 682d is opposite to the solid-state joint 320A in a direction intersecting the direction along the first outer edge 682d (width direction c). Compared to the solid-state joint 320A, which is opposite to the first outer edge 682d of the second member 682 in a direction intersecting the lamination direction A (width direction C), the length of the recess 682e of the second member 682 along the first outer edge 682d is smaller. The recess 682e of the second member 682 being smaller than the solid-state joint 320A means that, in the portion where the recess 682e and the solid-state joint 320A are opposite in the width direction C, there exists a region where the recess 682e is absent but the solid-state joint 320A is present. The recess 682e is formed only in the second joint portion 322R among the second mounting portion 322P, the second bending portion 322Q, and the second joint portion 322R of the second member 682.

[0253] (Effect of bus 680 in the ninth embodiment)

[0254] Reference Figure 24 The effect of bus 680 is explained.

[0255] (15) The length of the recess 681e of the first member 681 along the first outer edge 681d is less than the length of the solid-state joint 320A along its outer edge. The entire area of ​​the recess 681e along the first outer edge 681d is opposite to the solid-state joint 320A in a direction (width direction c) intersecting the direction along the first outer edge 681d. The length of the recess 682e of the second member 682 along the first outer edge 682d is less than the length of the solid-state joint 320A along its outer edge. The entire area of ​​the recess 682e along the first outer edge 682d is opposite to the solid-state joint 320A in a direction (width direction c) intersecting the direction along the first outer edge 682d. Alternatively, only one of the first member 681 or the second member 682 may have the above configuration.

[0256] With this configuration, the size of the recess 681e in the first member 681 can be relatively reduced. The effect of the recess 682e in the second member 682 is the same as that of the recess 681e in the first member 681.

[0257] (Bus 710 in the tenth embodiment)

[0258] (The configuration of the busbar 710 in the tenth embodiment)

[0259] Reference Figure 25 and Figure 26 The composition of busbar 710 is explained.

[0260] Figure 25 This is a top view showing the main parts of the busbar 710 according to the tenth embodiment. Figure 26 It is shown Figure 25 A bottom view of the 710 busbar.

[0261] The first member 711 is equivalent to a configuration that does not include the second protrusion 321h protruding from the second outer edge 321f. The configuration of the first member 711 is otherwise identical to that of the first member 321. The second member 712 is equivalent to a configuration that does not include the second protrusion 322h protruding from the second outer edge 322f. The configuration of the second member 712 is otherwise identical to that of the second member 322.

[0262] (Effect of busbar 710 in the tenth embodiment)

[0263] Reference Figure 25 and Figure 26 The effect of busbar 710 is explained.

[0264] (1) The first member 711 is equivalent to a configuration that does not include the second protrusion 321h protruding from the second outer edge 321f. The second member 712 is equivalent to a configuration that does not include the second protrusion 322h protruding from the second outer edge 322f.

[0265] Based on this configuration, busbar 710 achieves a portion of the effect of busbar 320. Busbar 710 has an effect related to the first protrusion.

[0266] (Bus 720 of the eleventh embodiment)

[0267] (The configuration of the busbar 720 in the eleventh embodiment)

[0268] Reference Figure 27 and Figure 28 The composition of busbar 720 will be explained.

[0269] Figure 27 This is a top view showing the main parts of the busbar 720 according to the eleventh embodiment. Figure 28 It is shown Figure 27 A bottom view of the main part of the 720 busbar.

[0270] The first member 721 is equivalent to a configuration that does not include the first protrusion 321g protruding from the recess 321e. The first member 721 is otherwise identical to the first member 321. The second member 722 is equivalent to a configuration that does not include the first protrusion 322g protruding from the recess 322e. The second member 722 is otherwise identical to the second member 322.

[0271] (Effects of busbar 720 in the eleventh embodiment)

[0272] Reference Figure 27 and Figure 28 The effect of busbar 720 is explained.

[0273] The first member 721 is equivalent to a configuration that does not include a first protrusion 321g protruding from the recess 321e. The first member 721 includes a second protrusion 321h protruding from a second outer edge 321f that is adjacent to the first outer edge 321d and exposed outwards. The second member 722 is equivalent to a configuration that does not include a first protrusion 322g protruding from the recess 322e. The second member 722 includes a second protrusion 322h protruding from a second outer edge 322f that is adjacent to the first outer edge 322d and exposed outwards.

[0274] Based on this configuration, busbar 720 achieves a portion of the effect of busbar 320. Busbar 720 has an effect related to the second protrusion.

[0275] (Bus 730 in the twelfth embodiment)

[0276] (The configuration of the busbar 730 in the twelfth embodiment)

[0277] Reference Figure 29 and Figure 30 The composition of busbar 730 will be explained.

[0278] Figure 29 This is a perspective view showing the busbar 730 of the twelfth embodiment as viewed from above. Figure 30 This shows the view from below. Figure 29 A 3D view of busbar 730.

[0279] The first member 731 and the second member 322 have different rigidities. Both the first member 731 and the second member 322 include recesses. The recess of the member with lower rigidity is relatively larger than the recess of the member with higher rigidity. The first member 731 includes a recess 731e. The recess 731e of the first member 731 is relatively smaller than the recess 322e of the second member 322. Figure 7 Compared to the recess 322e shown, the recess 731e has a shorter recess length in the width direction C. The configuration of the first member 731 is equivalent to a configuration in which the recess 321e of the first member 321 is relatively reduced. The first member 731 has higher relative rigidity than the second member 322. The recess 731e included in the first member 731 is smaller than the recess 322e included in the second member 322.

[0280] (Effect of busbar 730 in the twelfth embodiment)

[0281] Reference Figure 29 and Figure 30 The effect of busbar 730 is explained.

[0282] (16) The first component 731 and the second component 322 have different rigidities. The first component 731 and the second component 322 each contain a recess. The recess of the component with lower relative rigidity is relatively larger than the recess of the component with higher relative rigidity.

[0283] With this configuration, the recess 322e can be relatively enlarged to accommodate the relatively less rigid and easily protruding first protrusion 322g, while the recess 731e can be relatively smaller to accommodate the relatively more rigid and less easily protruding first protrusion 321g. Thus, even when the recess 731e of the first member 731 is relatively smaller, the most protruding portions of the first protrusion 321g (with a smaller protrusion amount) and the most protruding portions of the first protrusion 322g can be positioned approximately the same. That is, even when the recess 731e of the first member 731 is relatively smaller, the influence of plastic deformation during solid-state bonding on the external dimensions can be effectively suppressed or prevented. Furthermore, since the size of the first member 731 does not need to match the size of the second member 322, and the first member 731 can be relatively enlarged, improved heat dissipation and increased rigidity as a whole for the busbar 730 can be achieved.

[0284] (Bus 740 in the thirteenth embodiment)

[0285] (The configuration of busbar 740 in the thirteenth embodiment)

[0286] Reference Figure 31 and Figure 32 The composition of busbar 740 will be explained.

[0287] Figure 31 This is a perspective view showing the busbar 740 of the thirteenth embodiment as seen from above. Figure 32 This shows the view from below. Figure 31 A 3D diagram of busbar 740.

[0288] Busbar 740 is configured such that the recess 741e of busbar 730 is formed on the entire outer edge 741k. That is, in busbar 740, the entire outer edge 741k is cut out, thereby forming the recess 741e.

[0289] (Effect of busbar 740 in the thirteenth embodiment)

[0290] Reference Figure 31 and Figure 32 The effect of busbar 740 is explained.

[0291] Busbar 740 is configured such that the recess 741e of busbar 730 is formed on the outer edge 741k.

[0292] This configuration makes the manufacture of busbar 740 relatively easy.

[0293] (Bus 750 of the fourteenth embodiment)

[0294] (The configuration of the busbar 750 in the fourteenth embodiment)

[0295] Reference Figure 33 and Figure 34 The composition of busbar 750 will be explained.

[0296] Figure 33 This is a perspective view showing the busbar 750 of the fourteenth embodiment as viewed from above. Figure 34 This shows the view from below. Figure 33 A 3D diagram of the 750 busbar.

[0297] The first member 751 and the second member 322 have different rigidities. The member with lower rigidity of the first member 751 and the second member 322 includes a recess 322e. Only the member with lower rigidity of the second member 322 includes the recess 322e. The first member 751 does not include a recess or a first protrusion. The other than that, the configuration of the first member 751 is the same as that of the first member 321.

[0298] (Effect of bus 750 in the fourteenth embodiment)

[0299] Reference Figure 33 and Figure 34 The effect of busbar 750 is explained.

[0300] (17) The first component 751 and the second component 322 have different rigidities. The component with lower relative rigidity of the first component 751 and the second component 322 includes the recess 322e.

[0301] With this configuration, in the second member 322, a recess 322e can be formed to accommodate the first protrusion 322g, which has relatively low rigidity and is easy to protrude. On the other hand, in the first member 751, the recess is omitted. Therefore, the manufacture of the busbar 750 can be made relatively easier.

[0302] (Bus 760 of the fifteenth embodiment)

[0303] (The configuration of the busbar 760 in the fifteenth embodiment)

[0304] Reference Figure 35 and Figure 36 The composition of bus 760 will be explained.

[0305] Figure 35 This is a perspective view showing the busbar 760 of the fifteenth embodiment as viewed from above. Figure 36 This shows the view from below. Figure 35 A 3D view of the 760 busbar.

[0306] Of the first member 321 and the second member 762, only the first member 321, which has relatively higher rigidity, includes a recess 321e. The second member 762 does not include a recess or a first protrusion. The other than that, the configuration of the second member 762 is the same as that of the second member 322.

[0307] (Effect of bus 760 in the fifteenth embodiment)

[0308] Reference Figure 35 and Figure 36 The effect of bus 760 is explained.

[0309] In the first member 321 and the second member 762, the first member 321, which has relatively higher rigidity, includes a recess 321e.

[0310] With this configuration, in the second member 762, a recess 321e can be formed to accommodate the first protrusion 321g, which has relatively high rigidity and prevents interference with other members. On the other hand, in the second member 762, the recess is omitted. Therefore, the manufacture of the busbar 760 can be made relatively easier.

[0311] (Bus 770 of the sixteenth embodiment)

[0312] (The configuration of the busbar 770 in the sixteenth embodiment)

[0313] Reference Figure 37 The composition of busbar 770 will be explained.

[0314] Figure 37 This is a perspective view showing the busbar 770 of the sixteenth embodiment as seen from above.

[0315] When the protrusion is included in the first member 321, the first protrusion 321g protrudes from the outer edge of the first member 321 toward the second member 772 along the stacking direction A of the first member 321 and the second member 772. When the protrusion is included in the second member 772, the first protrusion 772g protrudes from the outer edge of the second member 772 toward the first member 321 along the stacking direction A of the first member 321 and the second member 772. A portion of the first protrusion 772g of the second member 772 protrudes from the second member 772 toward the first member 321 in the stacking direction A. The first protrusion 772g of the second member 772 covers a portion of the first protrusion 321g of the first member 321.

[0316] (Effect of bus 770 in the sixteenth embodiment)

[0317] Reference Figure 37 The effects of busbar 770 will be explained.

[0318] (18) When the protrusion is included in the first member 321, the first protrusion 321g protrudes from the outer edge of the first member 321 toward the second member 772 along the stacking direction A of the first member 321 and the second member 772. When the protrusion is included in the second member 772, the first protrusion 772g protrudes from the outer edge of the second member 772 toward the first member 321 along the stacking direction A of the first member 321 and the second member 772.

[0319] Based on this configuration, a shape can be applied, such as busbar 770, where the first protrusion 772g of the second member 322 protrudes from the second member 772 toward the first member 321. By deforming the first protrusion 772g also in the stacking direction A, the amount of deformation (protrusion) in the width direction C is suppressed. As a result, the increase in the external dimensions of busbar 770 can be effectively suppressed.

[0320] (Buses in other embodiments and battery packs having such busbars)

[0321] The busbar and battery pack of the present invention are not limited to the configuration of the busbar and battery pack described in the embodiments, and can be appropriately configured based on the contents described in the claims.

[0322] The busbars and battery packs described in the embodiments are provided in detail or in a simplified manner for ease of understanding of the present invention, and do not necessarily need to include all the described components, or may include components not shown. In addition, a part of the components of the embodiments may be deleted, replaced with the components of other embodiments, or combined with the components of other embodiments.

[0323] The battery pack 1 contains no more than 20 batteries 100. For example, it may contain 2 to 19 or more batteries 100. The batteries 100 are not limited to lithium-ion batteries. For example, nickel-metal hydride batteries or lead-acid batteries may be used. The batteries 100 are not limited to rechargeable batteries. For example, primary batteries may be used.

[0324] (Bus 810 in another embodiment)

[0325] (Composition of busbar 810)

[0326] Reference Figure 38 The composition of busbar 810 will be explained.

[0327] Figure 38 This is a perspective view showing the main part of a busbar 810 according to another embodiment.

[0328] The spatial portion of the first member 811 includes a through hole 811i formed therein. The first member 811 includes the through hole 811i instead of a recess. The through hole 811i is formed on the first member 811 between the outer edge 811e and the solid-state joint 320A, and is rectangular in shape. In the width direction C of the first member 811, the through hole 811i is formed separately from the outer edge 811e and the solid-state joint 320A. The through hole 811i may also be formed in the width direction C of the first member 811 in contact with the solid-state joint 320A. The spatial portion of the second member 812 includes a through hole 812i formed therein. The second member 812 includes the through hole 812i instead of a recess. The through hole 812i is formed on the second member 812 between the outer edge 812e and the solid-state joint 320A, and is rectangular in shape. In the width direction C of the second member 812, the through hole 812i is formed separately from the outer edge 812e and the solid-state joint 320A. The through hole 812i may also be formed in the width direction C of the second member 812 in such a way that it contacts the solid-state joint 320A.

[0329] (Effect of busbar 810)

[0330] Reference Figure 38 The effect of busbar 810 is explained.

[0331] The spatial portion of the first member 811 includes a through hole 811i formed therein. The spatial portion of the second member 812 includes a through hole 812i formed therein. Alternatively, at least one of the first member 811 and the second member 812 may include a through hole.

[0332] With this configuration, in the first member 811, it is not necessary to form a recess on the first outer edge 321d, but a first protrusion 321g can be provided in the through hole 811i. The effect of the through hole 812i in the second member 812 is the same as that of the through hole 811i in the first member 811. Thus, for example, the outer shape of the first member 811 and the second member 812 as seen from the top view can be rectangular, reducing the number of corners. By reducing the number of corners, the risk of damage caused by interference between corners and other components such as cables can be reduced.

[0333] Symbol Explanation

[0334] 1. Battery pack

[0335] 100 batteries

[0336] 101 Container

[0337] 102 lids

[0338] 103 Positive extremes

[0339] 104 Negative extremes

[0340] 105 Safety valve

[0341] 200 holding units

[0342] 201 First end spacer

[0343] 202 Unit spacers

[0344] 203 Second end spacer

[0345] 211 First end block,

[0346] 212 Second end block,

[0347] 221 Insulating components

[0348] 222 Embedded nut

[0349] 231 First side plate,

[0350] 232 Second side plate

[0351] 241 Fastening bolts

[0352] 300 bus unit

[0353] 310 First end busbar (busbar)

[0354] 311 First component

[0355] 311i Insertion Hole

[0356] 312 Second component

[0357] 320 busbar

[0358] 320A Solid-phase junction

[0359] 321 First component

[0360] 321P First Installation Department

[0361] 321Q First bend

[0362] 321R First joint,

[0363] 321a mounting surface,

[0364] 321b First Boundary

[0365] 321c Second Boundary

[0366] 321d First outer edge (outer edge)

[0367] 321e concave part,

[0368] 321f Second outer edge,

[0369] 321g First protrusion (protrusion)

[0370] 321h Second protrusion,

[0371] 322 Second component

[0372] 322P Second Installation Section

[0373] 322Q Second bend

[0374] 322R Second Joint

[0375] 322a Mounting surface,

[0376] 322b First Boundary

[0377] 322c Second Boundary

[0378] 322d First outer edge (outer edge)

[0379] 322e concave part,

[0380] 322f Second outer edge,

[0381] 322g First protrusion (protrusion)

[0382] 322h Second protrusion,

[0383] 330 Second end busbar,

[0384] 331 Part 1

[0385] 332 Part Two

[0386] 332i Insertion Hole

[0387] 340 busbar retainer

[0388] 340a opening,

[0389] 340b Fixing part

[0390] 340c retaining part

[0391] 340d insertion part

[0392] 400 Voltage Detection Unit

[0393] 401 Voltage Detection Terminal

[0394] 402 electrical wire

[0395] 500 temperature measuring unit

[0396] 501 Temperature Sensor

[0397] 502 electrical wire

[0398] 610 busbar

[0399] 611 First component

[0400] 611P First Installation Department

[0401] 611Q First bend

[0402] 611R First joint,

[0403] 611d First outer edge (outer edge)

[0404] 611e concave part,

[0405] 611e1 base terminal,

[0406] 611e2 Top

[0407] 611f Second outer edge,

[0408] 611g First protrusion (protrusion)

[0409] 611h Second protrusion,

[0410] 612 Second component

[0411] 612P Second Installation Section

[0412] 612Q Second bend

[0413] 612R Second Joint

[0414] 612d First outer edge (outer edge)

[0415] 612e concave part,

[0416] 612e1 base terminal,

[0417] 612e2 Top

[0418] 612f Second outer edge,

[0419] 612g First protrusion (protrusion)

[0420] 612h Second protrusion,

[0421] 620 busbar

[0422] 621 First component

[0423] 621e concave part,

[0424] 621f Second outer edge,

[0425] 621g First protrusion,

[0426] 621h Second protrusion,

[0427] 622 Second component

[0428] 622e concave part,

[0429] 622f Second outer edge,

[0430] 622g First protrusion

[0431] 622h Second protrusion,

[0432] 630 busbar

[0433] 631 First component

[0434] 631m concave part,

[0435] 632 Second component

[0436] 632m concave part,

[0437] 640 busbar

[0438] 641 First component

[0439] 641d outer edge,

[0440] 641e concave part,

[0441] 641e1 Side view

[0442] 641f Second outer edge,

[0443] 641g First protrusion,

[0444] 642 Second component

[0445] 642d outer edge,

[0446] 642e concave part,

[0447] 642e1 Side view

[0448] 650 busbar

[0449] 651 First component

[0450] 651e concave part,

[0451] 652 Second component

[0452] 652e concave part,

[0453] 660 busbar

[0454] 661 First component

[0455] 661g First protrusion,

[0456] 662 Second component

[0457] 662g First protrusion,

[0458] 670 busbar

[0459] 671 First component

[0460] 671g First protrusion,

[0461] 672 Second component

[0462] 672g Second protrusion,

[0463] 681 First component

[0464] 681d First outer edge (outer edge)

[0465] 681e concave part,

[0466] 682 Second component

[0467] 682d First outer edge (outer edge)

[0468] 682e concave part,

[0469] 710 busbar

[0470] 711 First component

[0471] 712 Second component

[0472] 720 busbar

[0473] 721 First component

[0474] 722 Second component

[0475] 730 busbar

[0476] 731 First component

[0477] 731e concave part,

[0478] 740 busbar

[0479] 741e concave part,

[0480] 741k outer edge,

[0481] 750 busbar

[0482] 751 First component

[0483] 760 bus,

[0484] 762 Second component

[0485] 770 busbar

[0486] 772 Second component

[0487] 772g First protrusion

[0488] X (of battery 100) stacking direction,

[0489] Y (width direction of battery 100),

[0490] Z (Battery 100) height direction,

[0491] A (the stacking direction of the first and second components),

[0492] B (the vibration direction of the solid-state connection between the first and second components),

[0493] C (width direction of the first and second components)

[0494] D1 (centerline (center) of the solid-phase joint 320A extending in the width direction C)

[0495] D2 (centerline in the solid-phase joint 320A extending in the vibration direction B) centerline (center).

Claims

1. A busbar, characterized in that, have: The first component; and A second component stacked on top of the first component. The first component and the second component include a solid-state joint formed by solid-state bonding. At least one of the first member and the second member includes a concave recess exposed at its outer edge. The recess is adjacent to the solid phase junction.

2. The busbar as described in claim 1, characterized in that, The recesses are adjacent to each other when they are separated from the solid phase bonding portion.

3. The busbar as described in claim 1, characterized in that, At least one of the first member and the second member includes a protrusion that projects outward from the recess.

4. The busbar as described in claim 3, characterized in that, The top of the protrusion is located on the side closer to the solid-phase joint than the outer edge, along a direction that intersects the stacking direction of the first member and the second member.

5. The busbar as described in claim 3, characterized in that, When the recess is included in the first member, the protrusion slopes from the base end side toward the top end side toward the second member side. When the recess is included in the second member, the protrusion is inclined from the base end side toward the top end side toward the first member side.

6. The busbar as described in claim 3, characterized in that, The length of the recess along the outer edge is greater than or equal to the length of the solid-phase joint along the outer edge. The entire area of ​​the recess along the outer edge is opposite the solid-phase joint in a direction intersecting the direction along the outer edge.

7. The busbar as described in claim 1, characterized in that, The first component and the second component each include the recess.

8. The busbar as described in claim 7, characterized in that, Each of the recesses overlaps at least partially along the stacking direction of the first and second components.

9. The busbar as described in claim 1, characterized in that, At least one of the first member and the second member includes a second outer edge intersecting the outer edge, and a second protrusion projecting from the second outer edge. When the second outer edge is contained within the first member, the second protrusion protrudes from the second outer edge of the first member toward the second member side. When the second outer edge is contained within the second member, the second protrusion protrudes from the second outer edge of the second member toward the first member.

10. The busbar as described in claim 1, characterized in that, When the recess is included in the first member, the recess includes a portion whose width is relatively narrowed in the direction intersecting the outer edge from the first member toward the second member. When the recess is included in the second member, the recess includes a portion whose width is relatively narrowed in the direction from the second member toward the first member and intersecting the outer edge.

11. The busbar as described in claim 1, characterized in that, The recess includes a portion that curves concavely toward the center of the solid-phase joint.

12. The busbar as described in claim 1, characterized in that, At least one of the first member and the second member includes a second outer edge that intersects with the outer edge. The recess and the second outer edge are adjacent to each other, separated by a recess that is recessed toward the solid phase joint side.

13. The busbar as described in claim 1, characterized in that, The side of the recess is inclined from the stacking direction of the first component and the second component toward the solid phase joint side.

14. The busbar as described in claim 3, characterized in that, The tip of the protrusion protrudes outward beyond the outer edge in a direction that intersects the stacking direction of the first member and the second member.

15. The busbar as described in claim 1, characterized in that, The length of the recess along the outer edge is less than the length of the solid-phase joint along the outer edge. The entire area of ​​the recess along the outer edge is opposite the solid-phase joint in a direction intersecting the direction along the outer edge.

16. The busbar as claimed in claim 1, characterized in that, The first component and the second component have different rigidities. The first component and the second component each include the recess. The recess of the component with lower relative rigidity is relatively larger than the recess of the component with higher relative rigidity.

17. The busbar as claimed in claim 1, characterized in that, The first component and the second component have different rigidities. The recess is included in the component with lower relative rigidity between the first and second components.

18. The busbar as described in claim 3, characterized in that, When the protrusion is included in the first member, the protrusion protrudes from the outer edge of the first member toward the second member along the stacking direction of the first member and the second member. When the protrusion is included in the second member, the protrusion protrudes from the outer edge of the second member toward the first member along the stacking direction of the first member and the second member.

19. A battery pack, characterized in that, have: Batteries; and The bus as described in claim 1 is connected to the battery.

20. The battery pack as claimed in claim 19, characterized in that, It has a retaining member that contacts the outer edge and holds the busbar.

Images