JP6180848B2 - Battery pack busbar and battery pack - Google Patents

Description

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

  For example, vehicles such as electric vehicles and hybrid vehicles use assembled batteries in which a plurality of single battery cells are combined. In an assembled battery, necessary voltages and electric power are obtained by connecting terminals of a plurality of unit cells (see Patent Document 1).

Special table 2010-522407 gazette

  However, in the battery pack described in the above-described patent document, the first conductive layer that connects the electrodes of each unit cell is provided integrally with a cover plate whose base is made of insulating plastic. Therefore, when changing the number of unit cells of the assembled battery, the cover plate must be recreated, and the degree of design freedom is poor.

The bus bar of the assembled battery according to the first aspect of the present invention is provided with a conductive base material connected to the electrode of the unit cell, an insulating layer provided on the conductive base material, and provided on the insulating layer, A first conductive layer electrically connected to the conductive substrate; and provided on the insulating layer; and electrically connected via the conductive substrate and the first conductive layer; And a connection portion to which a voltage detection signal line for outputting a voltage to the outside is connected, and the first conductive layer is separated into a conductive layer on the conductive substrate side and a conductive layer on the connection portion side. An assembled battery bus bar in which the separated conductive layers are connected by a fuse as a surface mounting component.
The bus bar of the assembled battery according to the second aspect of the present invention includes a conductive base material connected to an electrode of a single battery cell, an insulating layer provided on the conductive base material, and provided on the insulating layer, A first conductive layer electrically connected to the conductive substrate; and provided on the insulating layer; and electrically connected via the conductive substrate and the first conductive layer; A connection part to which a voltage detection signal line for outputting a voltage to the outside is connected, and second and third conductive layers provided on the insulating layer and insulated from the conductive base material and the first conductive layer A temperature sensor element as a surface-mounted component connected between the second conductive layer and the third conductive layer, and a first connecting the second conductive layer and an external temperature detection signal line And a second connection portion for connecting the third conductive layer and an external temperature detection signal line. .
The assembled battery according to the third aspect of the present invention includes a plurality of the single battery cells and any of the bus bars described above.

  According to the present invention, the degree of freedom in designing the assembled battery is improved, and the cost can be reduced.

It is an exploded view of the assembled battery of 1st Embodiment. It is an exploded view of a bus bar holder assembly. It is a perspective view of a bus bar assembly. It is a figure which shows typically the cross section of a bus bar assembly. It is a perspective view of a terminal bus bar assembly. It is a perspective view of a terminal bus bar assembly. It is an example of the components block diagram of the bus bar assembly of 2nd Embodiment. It is a figure which shows a modification. It is a figure which shows a modification.

--- First embodiment ---
With reference to FIGS. 1-6, the 1st Embodiment of the bus bar of an assembled battery and assembled battery by this invention is described. FIG. 1 is an exploded view of the assembled battery of the present embodiment, and FIG. 2 is an exploded view of the bus bar holder assembly.

  The assembled battery 1 of the present embodiment includes a cooling plate 25, a plurality of single battery cells 210, a cell holder 19, an end cell holder 20, an end plate 21, a side plate 22, a gas passage forming member 40, and a bus bar holder. Assemblies 150 and 160, a harness body 170, and a power cable 17 are provided.

  The unit cell 210 is a so-called prismatic battery having a flat prismatic shape. In the assembled battery 1, a plurality of single battery cells 210 are stacked with the wide surfaces facing each other via the cell holder 19. In the single battery cell 210 at the end of the assembled battery 1 in the longitudinal direction, that is, the single battery cell 210 at both ends in the stacking direction, the end cell holder 20 abuts on the wide surface facing outward in the stacking direction. Thus, each single battery cell 210 is insulated and held by the plurality of cell holders 19 and end cell holders 20. The material of the cell holder 19 and the end cell holder 20 is an insulating resin such as polypropylene, polyamide, polyetherimide, polyphenylene sulfide, polyphthalamide, or polybutylene terephthalate.

  The single battery cell 210 insulated and held by the plurality of cell holders 19 and the end cell holder 20 is pressed on the narrow surface of the single battery cell 210 while being pressed in the stacking direction with a predetermined load by the end plates 21 at both ends in the stacking direction. It is held by the side plates 22 arranged to face each other. The end plate 21 and the side plate 22 are coupled by fastening the side plate 22 with a small screw 23 in a screw hole 21 a opened in the end plate 21.

  The end plate 21 is fastened by a bolt 26 to a cooling plate 25 having a pipe 24 that is a refrigerant circulation path. The cooling plate 25 is a plate-like member made of, for example, aluminum having good thermal conductivity. A heat transfer sheet 27 made of silicon or acrylic as a base material is disposed on the upper surface of the cooling plate 25 in the figure. When the end plate 21 is fastened to the cooling plate 25, the heat transfer sheet 27 is attached to each unit cell 210. Touch the bottom of the. As the refrigerant circulates inside the pipe 24 by a cooling device (not shown), heat generated by charging / discharging the single battery cell 210 is removed, and the temperature of each single battery cell 210 is maintained at a specified temperature.

  A gas passage forming member 40 that forms a passage for gas discharged from the cleavage valve 210b when the internal pressure of the single battery cell 210 increases is disposed above the stacked battery cells 210. The gas passage forming member 40 is fastened to the end plate 21 with a small screw 42 and fixed together with the gasket 41. The gas passage forming member 40 is made of, for example, a metal such as stainless steel so as to withstand the heat of the gas released from the single battery cell 210. The gas released from the cleavage valve 210 b flows through the space surrounded by the lower surface of the gas passage forming member 40, the unit cell 210, and the gasket 41, and the gas passage provided at the longitudinal end of the assembled battery 1. It is discharged outside through the opening of the forming member 40.

  The bus bar assembly 100 shown in FIG. 3 (described later) or the terminal bus bar assemblies 120 and 121 shown in FIG. 4 are fastened and attached to the terminals (electrode studs) 210a of each unit cell 210 by a nut 130. Details of the bus bar assembly 100 and the terminal bus bar assemblies 120 and 121 will be described later. In the present embodiment, the single battery cells 210 are connected in series by the bus bar assembly 100.

  As shown in FIG. 2, the bus bar holder assembly 150 includes a resin bus bar holder 15, a bus bar assembly 100, and terminal bus bar assemblies 120 and 121. Similarly, the bus bar holder assembly 160 includes a resin bus bar holder 16 and the bus bar assembly 100.

  The bus bar holders 15 and 16 are members in which box-shaped members with lids are connected in the longitudinal direction of the assembled battery 1. The bus bar assemblies 100 and the terminal bus bar assemblies 120 and 121 are individually accommodated in the box. Insulated from other metal parts of the assembled battery 1. The bus bar holders 15, 16 are provided with openings 15 a, 16 a on side surfaces located at both ends in the short direction of the assembled battery 1.

  The harness body 170 is a harness that bundles voltage detection signal lines for outputting the voltage of the unit cell 210 to a battery controller that is an external battery monitoring device (not shown). The end of each voltage detection signal line of the harness body 170 on the single battery cell side (bus bus side) is connected to a plurality of connectors 170b connected to each bus bar assembly 100 and the terminal bus bar assemblies 120, 121. . The end of each voltage detection signal line of the harness body 170 on the battery controller side is connected to the relay connector 170a.

  FIG. 3 is a perspective view of the bus bar assembly 100, and FIG. 4 is a diagram schematically showing a cross section of the bus bar assembly 100. The bus bar assembly 100 includes a substantially flat bus bar 10, a fuse 111 provided on the bus bar, and a connector 112. The bus bar 10 includes a conductive layer 10c as a conductive substrate, electrode through holes 10a and 10b, an insulating layer 10d, a first conductive layer 10g, and a through hole 10h.

  The conductive layer 10c is, for example, a plate-like conductor having a thickness of about 0.5 to 3.0 mm, from the viewpoint of securing the cross-sectional area for obtaining the power of the assembled battery and the strength member of the bus bar 10. It is formed thick. The material of the conductive layer 10c is a material excellent in conductivity, such as copper or aluminum. The electrode through holes 10a and 10b are through holes into which the electrode studs 210a of the unit cells 210 are inserted. The inner diameters of the electrode through holes 10 a and 10 b are larger than the outer diameter of the electrode stud 210 a of the single battery cell 210. The electrode through-hole 10b has an oval shape, and absorbs variations in dimensions between the electrode studs 210a when the assembled battery 1 is assembled.

An insulating layer 10d is formed on the upper surface of the conductive layer 10c by being attached in advance by adhesion, for example. The material of the insulating layer 10d is a material having electrical insulation, and is, for example, an organic material such as polyimide resin or epoxy resin. The insulating layer 10d preferably has a thickness of 25 μm to 120 μm and a volume resistivity of 10 ⁶ Ωm or more. The insulating layer 10d has holes 10e and 10f having shapes similar to the outlines of the electrode through holes 10a and 10b of the conductive layer 10c. Thus, when the assembled battery 1 is assembled, when the nut 130 is screwed into the electrode stud 210a of the single battery cell 210 protruding from the electrode through holes 10a and 10b, the seat surface of the nut 130 directly contacts the conductive layer 10c. To do. Further, the axial force of fastening due to the screwing of the nut 130 directly acts on the conductive layer 10c.

  A first conductive layer 10g having a thickness of about 10 μm to 70 μm is bonded to the upper surface of the insulating layer 10d in the drawing in advance. First conductive layer 10g is a circuit pattern formed by etching, for example. The first conductive layer 10g is separated into a base material side conductive layer 10i and a connection portion side conductive layer 10j. The base-side conductive layer 10i is provided with a through hole 10h that passes through the base-side conductive layer 10i, the insulating layer 10d, and the conductive layer 10c. A conductive layer 10k is formed on the inner peripheral surface of the through hole 10h by plating, for example. The conductive layer 10k electrically connects the base-side conductive layer 10i and the conductive layer 10c.

  The connection portion side conductive layer 10j is not directly connected to the conductive layer 10c, but is electrically connected to the conductive layer 10c by being connected to the base material side conductive layer 10i via the fuse 111.

  The bus bar 10 of the present embodiment has a three-layer structure in which a conductive layer 10c as a conductive base material is provided with an insulating layer 10d and a conductive layer before forming a circuit pattern of the first conductive layer 10g, that is, a conductive layer before etching. Manufactured from. The member having the three-layer structure is etched to form a circuit pattern of the first conductive layer 10g. Then, the insulating layer 10d corresponding to the holes 10e and 10f is removed, and electrode through holes 10a and 10b and through holes 10h are provided. Then, the inner peripheral surface of the through hole 10h is plated.

  The fuse 111 is a surface-mounted component provided in the bus bar 10 and is connected between the separated base material side conductive layer 10i and connection portion side conductive layer 10j as described above. The fuse 111 is connected to the base-side conductive layer 10i and the connection portion-side conductive layer 10j by, for example, solder. The fuse 111 prevents an undesired large current from flowing to a battery controller (not shown) by melting the built-in fuse element 111a by self-heating.

  The terminal 112a of the connector 112 is connected to the connection part side conductive layer 10j by solder, for example. The connector 112 is a connection part to which a voltage detection signal line for outputting the voltage of the unit cell 210 to a battery controller which is an external battery monitoring device (not shown) is connected. Specifically, the connector 170b of the harness body 170 is connected to the connector 112.

  FIG. 5 is a perspective view of the terminal bus bar assembly 120, and FIG. 6 is a perspective view of the terminal bus bar assembly 121. The terminal bus bar assemblies 120 and 121 are bus bar assemblies connected to electrode studs 210a corresponding to a positive electrode and a negative electrode when a plurality of unit cells 210 connected in series are viewed as one battery. .

  The terminal bus bar assembly 120 includes a substantially L-shaped bus bar 12, a fuse 111 and a connector 112 provided on the bus bar. The bus bar 12 includes a conductive layer 12c as a conductive base, an electrode through hole 12a, a power cable through hole 12b, an insulating layer 10d, a first conductive layer 10g, and a through hole 10h.

  The conductive layer 12c is the same member as the conductive layer 10c of the bus bar 10 except for the shape. The electrode through hole 12 a is the same as the electrode through hole 10 a of the bus bar 10. The power cable through-hole 12b is a part to which a power cable 17 that is a power input / output cable of the assembled battery 1 is connected (see FIG. 1). One end of the power cable 17 is fastened to the power cable through-hole 12b by a bolt 18, and the other end is connected to another assembled battery 1 attached to the same vehicle or an inverter (not shown).

  Similarly, the terminal bus bar assembly 121 includes a substantially L-shaped bus bar 13, a fuse 111 provided on the bus bar, and a connector 112. The bus bar 13 includes a conductive layer 13c as a conductive base material, an electrode through hole 13a, a power cable through hole 13b, an insulating layer 10d, a first conductive layer 10g, and a through hole 10h.

  The conductive layer 13c is the same member as the conductive layer 10c of the bus bar 10 except for the shape. The electrode through hole 13 a is the same as the electrode through hole 10 a of the bus bar 10. The power cable through-hole 13 b is the same as the power cable through-hole 12 b of the bus bar 12.

  In addition, about the terminal bus bar assemblies 120 and 121, since the part which attached | subjected the same code | symbol as the bus bar assembly 100 is the same as the bus bar assembly 100, description is abbreviate | omitted. Moreover, since the manufacturing method of the bus bars 12 and 13 is the same as the manufacturing method of the bus bar 10, the description thereof is omitted.

  In the assembled battery 1 configured as described above, the bus bar holder assemblies 150 and 160 are attached to the single battery cell 210 that is insulated and held on the cooling plate 25 by the plurality of cell holders 19 and the end cell holder 20. Specifically, the bus bar assembly 100 and the terminal bus bar assemblies 120, 121 housed in the bus bar holders 15, 16 are fixed to the electrode stud 210 a by the nut 130. Thus, the bus bar holders 15 and 16 are sandwiched between the bottom surfaces of the bus bar assembly 100 and the terminal bus bar assemblies 120 and 121 and the upper surface of the single battery cell 210, and the bus bar holder assemblies 150 and 160 are attached to the single battery cell 210. Fixed.

  Then, the bus bar assembly 100 in the bus bar holders 15 and 16, the connector 112 of the terminal bus bar assemblies 120 and 121, and the connector 170 b of the harness body 170 are connected via the openings 15 a and 16 a of the bus bar holders 15 and 16.

  Further, as described above, the power cable 17 and the terminal bus bar assemblies 120 and 121 are fastened by the bolts 18 respectively.

The assembled battery 1 of the present embodiment described above has the following operational effects.
(1) The bus bar assembly 100 is configured to include a substantially flat bus bar 10, a fuse 111 provided on the bus bar, and a connector 112. The bus bar 10 is configured to have a conductive layer 10c as a conductive substrate, electrode through holes 10a and 10b, an insulating layer 10d, a first conductive layer 10g, and a through hole 10h. Thereby, the electrode studs 210a of the adjacent single battery cells 210 arranged in a stack can be easily connected. Therefore, it is possible to easily cope with a change in the number of single battery cells 210 of the assembled battery 1, improving the degree of freedom in designing the assembled battery 1, and reducing costs.

(2) The terminal bus bar assembly 120 is configured to have a substantially L-shaped bus bar 12, a fuse 111 and a connector 112 provided on the bus bar. The bus bar 12 is configured to have a conductive layer 12c as a conductive substrate, an electrode through hole 12a, a power cable through hole 12b, an insulating layer 10d, a first conductive layer 10g, and a through hole 10h. . Further, the terminal bus bar assembly 121 was configured in the same manner as the terminal bus bar assembly 120. Thereby, among the plurality of unit cells 210 arranged in a stacked manner, the electrode studs 210a of the unit cells 210 located at both ends and the power cable 17 can be easily connected. Therefore, even if the number of unit cells 210 of the battery pack 1 is changed, it is not necessary to change the design of the terminal bus bar assemblies 120 and 121. Therefore, it is possible to easily cope with a change in the number of single battery cells 210 of the assembled battery 1, improving the degree of freedom in designing the assembled battery 1, and reducing costs.

(3) The conductive layer 10k is formed on the inner peripheral surface of the through hole 10h, so that the base-side conductive layer 10i and the conductive layer 10c are electrically connected. As a result, the base-side conductive layer 10i positioned between the insulating layer 10d and the conductive layer 10c can be easily electrically connected, so that the manufacturing cost of the bus bar assembly 100 and the terminal bus bar assemblies 120 and 121 is reduced. it can.

(4) Since the connector 112 is provided in the bus bar assembly 100 and the terminal bus bar assemblies 120, 121, the connection with the harness body 170 is facilitated, and the manufacturing cost of the assembled battery 1 can be reduced.

(5) Since the fuse 111 is provided in each of the bus bar assembly 100 and the terminal bus bar assemblies 120 and 121, an undesired large current can be prevented from flowing to a battery controller (not shown). Reliability can be improved. Moreover, since the fuse 111 is provided in each bus bar assembly 100 and the terminal bus bar assemblies 120 and 121, even when the fuse 111 is blown, the bus bar assembly 100 or the terminal bus bar assembly having the fuse 111 is used. Only 120 and 121 need to be replaced, and the cost of replacement parts can be reduced, the replacement work is facilitated, and the maintenance cost can be reduced.

(6) Since the first conductive layer 10g is separated into the base material side conductive layer 10i and the connection portion side conductive layer 10j, and the separated conductive layers are connected by the fuse 111, the bus bar assembly 100 and the terminal bus bar assemblies 120 and 121 can be easily mounted, and the manufacturing cost of the battery pack 1 can be reduced.

--- Second Embodiment ---
With reference to FIG. 7, a second embodiment of the battery pack and the battery pack according to the present invention will be described. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and different points will be mainly described. Points that are not particularly described are the same as those in the first embodiment. In the present embodiment, the bus bar manufacturing method is mainly different from that of the first embodiment.

  FIG. 7 is an example of a component configuration diagram of the bus bar assembly 300 according to the present embodiment. As shown in FIG. 7, the bus bar assembly 300 includes a substantially flat bus bar 30, a fuse 111 provided on the bus bar, and a connector 112. The bus bar 30 includes a conductive member 30c as a conductive base material and an insulating film 310.

  The conductive member 30c is, for example, a plate-like member having a thickness of about 0.5 to 3.0 mm, from the viewpoint of securing the cross-sectional area for obtaining the power of the assembled battery and the strength member of the bus bar 30. It is formed thick. The material of the conductive layer member 30c is a material excellent in conductivity, for example, copper or aluminum. The conductive member 30c is provided with an electrode through hole 30a similar to the electrode through hole 10a of the bus bar 10 in the first embodiment and an electrode through hole 30b similar to the electrode through hole 10b of the bus bar 10. It has been.

An insulating film 310 is attached to the upper surface of the conductive member 30c in the figure by adhesion. The material of the insulating film 310 is a material having electrical insulation, and is, for example, an organic material such as polyimide resin or epoxy resin. The insulating film 310 preferably has a thickness of 25 μm to 120 μm and a volume resistivity of 10 ⁶ Ωm or more. The insulating film 310 is provided with a hole 310a similar to the hole 10e of the insulating layer 10d in the first embodiment and a hole 310b similar to the hole 10f of the insulating layer 10d.

  A conductive layer 310c having a thickness of about 10 μm to 70 μm is bonded in advance to the upper surface of the insulating film 310 in the drawing. Conductive layer 310c is a circuit pattern formed by etching, for example. The conductive layer 310c is separated into a base material side conductive layer 310i and a connection portion side conductive layer 310j. A hole 310d is provided in the base-side conductive layer 310i. When the insulating film 310 is attached to the conductive member 30c, the base-side conductive layer 310i is configured to be electrically connected to the conductive member 30c through the hole 310d.

  The bus bar 30 of the present embodiment is manufactured by attaching the insulating film 310 on which the circuit pattern of the conductive layer 310c is formed to the conductive member 30c. That is, etching is performed on the insulating film 310 before the circuit pattern of the conductive layer 310c is formed to form a circuit pattern of the conductive layer 310c, and the insulating film 310 corresponding to the holes 310a and 310b is removed to remove the holes. A portion 310d is provided. Thereafter, the processed insulating film 310 described above is affixed to the conductive member 30c in which portions corresponding to the electrode through holes 30a and 30b are punched.

  The terminal bus bar assemblies 120 and 121 of the first embodiment may also be configured in the same manner as the bus bar assembly 300 of the present embodiment.

  In the present embodiment using the bus bar assembly 300, the same operational effects as the operational effects of the first embodiment are exhibited.

---- Modified example ---
(1) In the above description, the surface mount component in the bus bar assembly 100 is the fuse 111, but the present invention is not limited to this, and other surface mount components may be mounted. For example, as shown in FIG. 8, a temperature sensor element 114 as a surface mounting component that detects the surface temperature of the bus bar 10 may be mounted. In the bus bar assembly 400 shown in FIG. 8, a conductive layer 101 having a thickness of about 10 μm to 70 μm is bonded in advance to the upper surface of the insulating layer 10d in the drawing. The conductive layer 101 is a circuit pattern formed by etching, for example. The conductive layer 101 is separated into a first conductive layer 10m and a second conductive layer 10n.

  A temperature sensor element 114 is connected and attached to one end of the first conductive layer 10m and one end of the second conductive layer 10n, for example, by solder. The terminal 113a of the connector 113 is connected to the other end of the first conductive layer 10m and the other end of the second conductive layer 10n by, for example, solder. The connector 113 is a connection part to which a temperature detection signal line for outputting a signal of the temperature sensor element 114 to a battery controller which is an external battery monitoring device (not shown) is connected. A connector (not shown) of a temperature detection signal line from the battery controller is connected to the connector 113.

  For example, as described above, the temperature sensor element 114 is provided, and the internal temperature of the single battery cell 210 can be indirectly accurately measured by detecting the surface temperature of the bus bar 10. Can be controlled appropriately. Thereby, while the performance of the assembled battery 1 can be improved, deterioration of the single battery cell 210 in the assembled battery 1 can be suppressed.

(2) In the above description, the connector 112 is provided in the bus bar 10 as a connection part to which the voltage detection signal line for outputting the voltage of the unit cell 210 to an external battery controller (not shown) is connected. Is not limited to this. A terminal such as a tab, a round terminal, or a crimp terminal may be provided instead of the connector 112 as long as the function as the connection portion can be achieved. Further, instead of the connector 112 and the terminal, as shown in FIG. 9, a land 10p may be provided in the connection portion side conductive layer 10j so that the external detection signal line 115 is connected by solder or the like.

(3) In the above description, the bus bar holders 15 and 16 are members in which a box-like member with a lid is connected in the longitudinal direction of the assembled battery 1, but the present invention is not limited to this, and a box-like shape with a lid. These members may be separated individually. The bus bar holders 15 and 16 may be configured so as to be continuous in the longitudinal direction of the battery pack 1 by connecting individual box-shaped members with lids. Also good. In addition, when the box-shaped member with a lid | cover shall be isolate | separated separately, it can respond easily to the change of the number of the single cell 210 of the assembled battery 1, and the freedom degree of design of the assembled battery 1 improves. The cost can be reduced. Further, when the bus bar holders 15 and 16 are integrally formed in advance, the manufacturing cost of the bus bar holders 15 and 16 can be reduced.
(4) You may combine each embodiment and modification which were mentioned above, respectively.

  In addition, this invention is not limited to the thing of embodiment mentioned above at all, The electrically conductive base material connected to the electrode of a single battery cell, the insulating layer provided on the electrically conductive base material, and provided on an insulating layer A first conductive layer electrically connected to the conductive base material, and provided on the insulating layer, and electrically connected via the conductive base material and the first conductive layer. A bus bar having various structures including a connection portion to which a voltage detection signal line for output to the outside is connected, and an assembled battery having various structures including the bus bar are included.

1 assembled battery 10, 12, 13, 30 bus bar, 10a, 10b, 12a, 30a, 30b electrode through hole, 10c, 12c, 13c conductive layer, 10d insulating layer, 10e, 10f, 310a, 310b hole, 10g first 1 conductive layer, 10h through hole, 10i, 310i base material side conductive layer, 10j, 310j connection side conductive layer, 10k conductive layer, 10l conductive layer, 10m first conductive layer, 10n second conductive layer, 10p land, 12b Through hole for power cable, 15, 16 Busbar holder, 30c Conductive member, 100, 300, 400 Busbar assembly, 111 Fuse, 112, 113 Connector, 114 Temperature sensor element, 120, 121 Terminal busbar assembly, 130 Nut, 150 160 busbar holder assembly, 210 single battery cell, 210a Child (electrode stud), 310 insulating film, 310c conductive layer, 310 d hole

Claims (3)

A conductive substrate connected to the electrode of the unit cell;
An insulating layer provided on the conductive substrate;
A first conductive layer provided on the insulating layer and electrically connected to the conductive substrate;
A connection provided on the insulating layer, electrically connected to the conductive base material via the first conductive layer, and connected to a voltage detection signal line for outputting the voltage of the unit cell to the outside. and a part,
The first conductive layer is separated into a conductive layer on the conductive substrate side and a conductive layer on the connection part side,
A battery pack bus bar in which each separated conductive layer is connected by a fuse as a surface mount component . A conductive substrate connected to the electrode of the unit cell;
An insulating layer provided on the conductive substrate;
A first conductive layer provided on the insulating layer and electrically connected to the conductive substrate;
A connection provided on the insulating layer, electrically connected to the conductive base material via the first conductive layer, and connected to a voltage detection signal line for outputting the voltage of the unit cell to the outside. And
Second and third conductive layers provided on the insulating layer and insulated from the conductive base material and the first conductive layer;
A temperature sensor element as a surface-mounted component connected between the second conductive layer and the third conductive layer;
A first connection for connecting the second conductive layer and an external temperature detection signal line;
A bus bar of an assembled battery, comprising: a second connection portion that connects the third conductive layer and an external temperature detection signal line . A plurality of the single battery cells;
An assembled battery comprising the bus bar according to any one of claims 1 to 2 .

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