JP2023158944A - Bus bar laminate and manufacturing method of the bus bar laminate - Google Patents

Abstract

To provide a bus bar laminate with excellent airtightness.SOLUTION: A bus bar laminate of the present disclosure, comprises: at least two bus bars having a terminal part; at least one electric insulation spacer assembly that holds an interval of both of the adjacent bus bars; and a resin sealing part that seals a part of the bus bars and the electric insulation spacer assembly so as to expose the terminal part. The insulation spacer assembly is provided to each penetration hole of each bus bar. The insulation spacer assembly includes: a first spacer arranged between the adjacent bus bars; a second spacer positioned to an outermost side of one of the bus bars in a lamination direction; and a third spacer positioned at an outermost of the other side of the bus bars in the lamination direction. The adjacent two of the first spacer, the second spacer, and the third spacer are integrated so as to be fitted via the penetration hole, and support a peripheral edge part of the penetration hole. Each bus bar includes an uneven structure at a portion contacted to the resin sealing part.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a busbar laminate and a method for manufacturing a busbar laminate.

Traditionally, in electric vehicles, from the viewpoint of weight reduction and road noise countermeasures, electrical connections between electrical components that do not change in positional relationship (for example, electrical connections between an inverter and a motor, etc.) are often , a busbar is used instead of a harness.

Patent Document 1 discloses a method for manufacturing a multilayer molded busbar (hereinafter also referred to as a "busbar laminate"). As shown in FIG. 9, the method for manufacturing a busbar laminate 900 disclosed in Patent Document 1 includes a plurality of current-carrying plates 911 (hereinafter also referred to as "busbars 911") held facing each other at a predetermined interval. ) (hereinafter also referred to as the "busbar group 910") is placed in a mold and molded with resin to fill the gap between the opposing busbars 911 with resin, and to make the busbar group 910 part of the busbar group 910. is buried in the resin molded part 920 in an exposed state. Insulating spacers 930 are arranged in gaps between bus bars 911 that face each other at a predetermined distance. The insulating spacer 930 has a pedestal 931 and a convex portion 932 protruding from the pedestal 931. The convex portion 932 has a height equal to or less than the thickness of the bus bar 911. The protrusion 932 is inserted into the through hole H911 provided in the bus bar 911 to support the bus bar 911 on the pedestal 931, and the bottom surface S930 of the pedestal 931 is in contact with the bus bar 911 facing the bus bar 911 or the mold surface. , make a resin mold. Among the adjacent insulating spacers 930, the convex portion 932 of one insulating spacer 930 is in contact with the bottom surface S930 of the pedestal 931 of the other insulating spacer 930.

Japanese Patent Application Publication No. 2014-78406

In the method for manufacturing a multilayer molded busbar disclosed in Patent Document 1, the busbar 911 is usually gripped and set in a mold. Therefore, there is a possibility that a gap may be generated between the gripped portion of the bus bar 911 and the resin molded portion 920.
For example, when a multilayer molded busbar disclosed in Patent Document 1 is used for electrical connection between a motor that uses ATF (Automatic Transmission Fluid) for motor cooling and an inverter, the ATF in the motor is transferred to the busbar 911 by capillary action. There is a possibility that the liquid may leak to the inverter side through the gap between the resin molded part 920 and the resin molded part 920.
Therefore, there is a need for a busbar laminate that is less likely to form a gap between the conductive plate and the resin molded part (that is, has excellent airtightness).

In view of the above circumstances, it is an object of the present disclosure to provide a busbar laminate with excellent airtightness and a method for manufacturing the busbar laminate.

Means for solving the above problems include the following embodiments.
<1> At least two stacked bus bars having at least two terminal portions;
at least one electrically insulating spacer assembly that maintains a distance between adjacent bus bars of the at least two bus bars;
a resin sealing part that seals the at least two bus bars and the at least one electrically insulating spacer assembly so that the at least two terminal parts are exposed;
Equipped with
Each of the at least two bus bars has at least one through hole that faces each other between the adjacent bus bars,
the at least one electrically insulating spacer assembly is provided for each through hole, corresponding to the at least one through hole;
The at least one electrically insulating spacer assembly comprises:
at least one first spacer disposed between the adjacent bus bars;
one second spacer disposed on one side of a bus bar in the stacking direction of the at least two bus bars, which is located on one side of the at least two bus bars in the stacking direction;
one third spacer disposed on the other side in the stacking direction of the bus bar located on the othermost side in the stacking direction of the at least two bus bars,
One of the two adjacent ones of the at least one first spacer, the second spacer, and the third spacer has a convex portion, and the other has a concave shape into which the convex portion fits,
The two adjacent ones are fitted into one body through one of the at least one through hole, and support a peripheral edge of the one through hole,
Each of the at least two bus bars has an uneven structure at a portion that contacts the resin sealing portion.
<2> The busbar laminate according to <1>, wherein the through hole has a diameter of 2 mm or less.
<3> The at least one first spacer is
a first pedestal portion having a first main surface on one side in the stacking direction and a second main surface on the opposite side of the first main surface;
a first fitting part formed on the first main surface of the first pedestal part;
a second fitting portion formed on the second main surface of the first pedestal portion;
The second spacer is
a second pedestal portion having a first main surface on one side in the stacking direction and a second main surface on the opposite side of the first main surface;
a third fitting part formed on the first main surface of the second pedestal part;
has
The third spacer is
a third pedestal portion having a first main surface on one side in the stacking direction and a second main surface on the opposite side of the first main surface;
a fourth fitting part formed on the first main surface of the third pedestal part;
has
Each of the first fitting part, the second fitting part, the third fitting part, and the fourth fitting part has one of the convex part and the concave part, the bus bar according to <1> or <2>. laminate.
<4> The at least one electrically insulating spacer assembly is made of resin,
The bus bar laminate according to <1> or <2>, wherein the at least one electrically insulating spacer assembly and the resin sealing part are fused.
<5> The busbar laminate according to <1> or <2>, wherein the at least two busbars contain at least one of copper and aluminum.
<6> A method of manufacturing the busbar laminate according to <1> or <2> by insert molding, comprising:
Two of the at least one first spacer, the second spacer, and the third spacer are fitted together with one through hole of the at least one through hole interposed therebetween. . A method of manufacturing a busbar laminate, comprising the step of forming the electrically insulating spacer assembly.

According to the present disclosure, a busbar laminate with excellent airtightness and a method for manufacturing the busbar laminate are provided.

FIG. 1 is a perspective view showing the appearance of a busbar laminate according to a first embodiment of the present disclosure. FIG. 2 is a perspective view taken along the line C2-C2 in FIG. FIG. 3 is a perspective view showing the appearance of the bus bar according to the first embodiment of the present disclosure. FIG. 4 is a perspective view showing the appearance of the first spacer according to the first embodiment of the present disclosure. FIG. 5 is a perspective view showing the appearance of the second spacer according to the first embodiment of the present disclosure. FIG. 6 is a perspective view showing the appearance of the third spacer according to the first embodiment of the present disclosure. FIG. 7 is a perspective view showing the appearance of a busbar laminate according to a second embodiment of the present disclosure. FIG. 8 is a top view showing the appearance of the insert product according to the second embodiment of the present disclosure as viewed from the direction D1 in FIG. 7. FIG. FIG. 9 is a cross-sectional view of a conventional busbar laminate.

In this specification, a numerical range expressed using "~" means a range that includes the numerical values written before and after "~" as lower and upper limits.
In this specification, the term "process" is used not only to refer to an independent process, but also to include any process that is not clearly distinguishable from other processes as long as the intended purpose of the process is achieved. It will be done.

Hereinafter, embodiments of a busbar laminate and a method for manufacturing a busbar laminate according to the present disclosure will be described with reference to the drawings. In the drawings, the same or corresponding parts are given the same reference numerals and the description will not be repeated.

(1) Busbar laminate The busbar laminate of the present disclosure includes at least two stacked busbars each having at least two terminal portions, and at least one of the at least two busbars that maintains a distance between adjacent busbars. one electrically insulating spacer assembly; a resin sealing portion sealing the at least two bus bars and the at least one electrically insulating spacer assembly so that the at least two terminal portions are exposed; Equipped with Each of the at least two bus bars has at least one through hole that faces each other in the adjacent bus bars. The at least one electrically insulating spacer assembly is provided for each through hole, corresponding to the at least one through hole. The at least one electrically insulating spacer assembly includes at least one first spacer disposed between the adjacent busbars and a busbar located on one side of the at least two busbars in the stacking direction. one second spacer disposed on one side in the lamination direction; and one third spacer disposed on the other side in the lamination direction of the bus bar located on the other side of the at least two bus bars in the lamination direction. It has a spacer. One of two adjacent ones of the at least one first spacer, the second spacer, and the third spacer has a protrusion, and the other has a recess into which the protrusion fits. The two adjacent ones fit into each other through one of the at least one through hole and are integrated, and support the peripheral edge of the one through hole. Each of the at least two bus bars has an uneven structure at a portion that contacts the resin sealing portion.

In this disclosure, a "busbar" refers to a metal bar that electrically connects at least two electrical components.
In the present disclosure, the "periphery of the through hole" refers to a region of the bus bar near the peripheral edge of the through hole of the bus bar. Specifically, the area near the peripheral edge of the through-hole of the bus bar is a rectangular area with an area of 15 mm x 15 mm or less, preferably 5 mm x 5 mm or less.

Hereinafter, the direction in which at least two busbars are stacked will also be simply referred to as the "stacking direction."

Since the busbar laminate of the present disclosure has the above configuration, it has excellent airtightness. In other words, in the busbar laminate of the present disclosure, gaps are unlikely to occur between the portion of the busbar that contacts the resin-sealed portion and the resin-sealed portion.
This effect is presumed to be due to the following reasons, but is not limited thereto.
In the busbar laminate of the present disclosure, each of the at least two busbars has an uneven structure at a portion that contacts the resin sealing portion. As a result, a portion of the resin sealing portion enters into the recess of the uneven structure of the bus bar. As a result, the bus bar is more firmly bonded to the resin sealing portion.
Further, two adjacent ones of the at least one first spacer, the second spacer, and the third spacer are fitted together through one of the at least one through holes to be integrated. Therefore, when manufacturing the busbar laminate of the present disclosure by insert molding, only the electrically insulating spacer assembly included in the insert product consisting of at least two busbars and at least one electrically insulating spacer assembly is gripped. , the insert product can be set in the mold. As a result, the uneven structure of the portion of the bus bar that contacts the resin sealing portion is less likely to be destroyed than when the insert product is set in the mold by gripping the bus bar included in the insert product.
Furthermore, at least one of the first spacer, the second spacer, and the two adjacent third spacers support the peripheral edge of one through hole. In other words, at least one of the first spacer, the second spacer, and the two adjacent third spacers do not cover the entire surface of the bus bar where the through hole is formed. In other words, the area of the portion of the bus bar that comes into contact with the resin sealing portion is relatively large.
From the above, it is presumed that the busbar laminate has excellent airtightness.
Therefore, when the bus bar laminate of the present disclosure is used for electrical connection between a motor that uses ATF for motor cooling and an inverter, ATF in the motor is unlikely to leak to the inverter side.

The bus bar laminate of the present disclosure is used to electrically connect electrical components. Electrical components are not particularly limited, and include motors, inverters, battery modules, and the like. Examples of the battery module include a lithium ion battery module.

The shape of the busbar laminate and the size of the busbar laminate are not particularly limited, and are appropriately selected depending on the use of the busbar laminate.

(1.1) Busbar A busbar is a metal bar. The configurations of each of the at least two busbars may be the same or different. The number of busbars, the shape of the busbars, and the size of the busbars are appropriately selected depending on the use of the busbar laminate.

The bus bar consists of a portion that contacts the resin sealing portion and a portion that does not contact the resin sealing portion.

The bus bar has an uneven structure at a portion that contacts the resin sealing portion. As a result, a portion of the resin sealing portion enters into the recess of the uneven structure of the bus bar. As a result, the bus bar is more firmly bonded to the resin sealing part.

The state of the uneven structure is not particularly limited as long as sufficient bonding strength between the bus bar and the resin sealing portion can be obtained.
The average pore diameter of the recesses in the uneven structure is preferably 5 nm to 500 μm, more preferably 10 nm to 150 μm, even more preferably 15 nm to 100 μm.
The average pore depth of the recesses in the uneven structure is preferably 5 nm to 500 μm, more preferably 10 nm to 150 μm, even more preferably 15 nm to 100 μm.
When at least one of the average pore diameter or the average pore depth of the recesses in the uneven structure is within the above numerical range, a stronger bond tends to be obtained.
The method for measuring the average pore diameter and average pore depth of the recess is a method based on JIS B0601-2001.

The uneven structure is formed by roughening the surface of the bus bar. The method of roughening the surface of the bus bar is not particularly limited, and various known methods may be used.
The surface of the bus bar may be treated to add functional groups from the viewpoint of improving bonding strength. The treatment for adding a functional group may be performed by various known methods.

The bus bar has at least one through hole at a portion that contacts the resin sealing portion. One electrically insulating spacer assembly is disposed in one through hole. At least one through hole faces each other in adjacent bus bars. The number of through holes, the position of the through holes, the shape of the through holes, etc. are appropriately selected depending on the use of the bus bar laminate.

The diameter of the through hole is preferably 2 mm or less, more preferably 1.5 mm or less. The diameter of the through hole is preferably 0.5 mm or more, more preferably 1 mm or more.
When the diameter of the through hole is 2 mm or less, there is no need to increase the thickness of the resin around the through hole to reliably cover the bus bar, the molding conditions are simpler, and the resin sealing part is formed. The amount of resin used can be reduced. When a through hole is formed in a long plate-shaped bus bar, from the viewpoint of ensuring uniform current density in the longitudinal direction of the bus bar, the part where the through hole is formed (hereinafter also referred to as the "through hole forming part") The width of the busbar (the length in the transverse direction of the busbar) at It can be expanded by the size (e.g. diameter). When a busbar laminate is used for electrical connection between a motor that uses ATF for motor cooling and an inverter, for example, the busbar is a long plate-like object (width (length in the short direction of the busbar): about 10 mm). In addition, the thickness of each resin sealing part in the through-hole non-forming part formed on both side surfaces of the bus bar (the length in the transverse direction of the bus bar) is about 1.5 mm. In this case, if the diameter of the through-hole is 2 mm or less, the width of the bus bar in the through-hole formed portion is increased by 1 mm or less per side relative to the non-through-hole formed portion. The length of 1 mm or less is shorter than the thickness of the resin sealing part in the part where no through hole is formed. Therefore, it is not necessary to partially widen the width of the busbar laminate at the through-hole forming portion so that the through-hole forming portion is not exposed. As a result, when the diameter of the through hole is 2 mm or less, the molding conditions are simpler than when the diameter of the through hole is more than 2 mm, and the amount of resin used for forming the resin sealing part is reduced.
When the diameter of the through hole is 0.5 mm or more, it is easy to mold a spacer for passing through the through hole (for example, it is easy to handle if the diameter of the convex portion described later is large) and assemble it with a bus bar.

The bus bar includes at least two terminal portions at a portion that does not come into contact with the resin sealing portion of the bus bar. The number of terminal portions of the busbar is appropriately selected depending on the use of the busbar laminate. The terminal portion may be plated or may have a through hole for passing a bolt therethrough in order to easily make an electrical connection with an electric component.

The metals constituting the bus bar are not particularly limited, and examples include iron, copper, nickel, gold, silver, platinum, cobalt, zinc, lead, tin, titanium, chromium, aluminum, magnesium, manganese, and alloys thereof (stainless steel, brass, phosphor bronze, etc.).
Among these, it is preferable that at least two bus bars contain at least one of copper and aluminum. By including copper in the busbar, high electrical conductivity of the busbar can be ensured. By including aluminum in the bus bar, it is possible to reduce the weight and ensure strength of the bus bar.

(1.2) Electrically insulating spacer assembly The electrically insulating spacer assembly maintains the distance between adjacent bus bars. At least one electrically insulating spacer assembly is provided for each through-hole, corresponding to at least one through-hole. That is, the number of electrically insulating spacer assemblies is the same as the number of through holes formed in the bus bar, and one electrically insulating spacer assembly is provided in one through hole.

The electrically insulating spacer assembly has at least one first spacer, one second spacer, and one third spacer. The first spacer is arranged between adjacent bus bars. The second spacer is disposed on one side in the stacking direction of the bus bar that is located closest to one side in the stacking direction of at least two of the at least two bus bars. The third spacer is arranged on the other side in the stacking direction of the bus bar located on the othermost side in the stacking direction of the at least two bus bars. At least one of two adjacent first spacers, second spacers, and third spacers has a convex portion. The other one (that is, the other of two adjacent at least one of the first spacer, the second spacer, and the third spacer) has a recess into which the projection fits. The two adjacent ones fit together through one of the at least one through hole and are integrated, and support the peripheral edge of the one through hole.

The number of first spacers indicates the number obtained by subtracting one from the number of bus bars.

The convex portion is located within the through hole of the bus bar in the bus bar laminate. The height of the convex portion is not particularly limited, and may be higher than the thickness of the bus bar, may be the same as the thickness of the bus bar, or may be lower than the thickness of the bus bar. The shape of the convex portion is not particularly limited, and examples include a cylindrical shape, a polygonal shape, a conical shape, and a pyramidal shape. Examples of the polygonal prism include a triangular prism, a quadrangular prism, a pentagonal prism, a hexagonal prism, a heptagonal prism, and the like. Examples of the triangular prism include an equilateral triangular prism, a right triangular prism, and an isosceles triangular prism. Examples of the quadrangular pillar include a square pillar, a rectangular pillar, a parallelogram pillar, and a trapezoidal pillar.
The shape of the concave portion is not particularly limited as long as the convex portion fits therein, and is appropriately selected depending on the shape of the convex portion.

The at least one first spacer includes a first pedestal portion having a first main surface on one side in the stacking direction and a second main surface opposite to the first main surface, and a first pedestal portion of the first pedestal portion. comprising a first fitting part formed on a main surface and a second fitting part formed on a second main surface of the first pedestal part,
The second spacer includes a second pedestal portion having a first main surface on one side in the stacking direction and a second main surface opposite to the first main surface, and a first main surface of the second pedestal portion. a third fitting portion formed;
The third spacer includes a third pedestal portion having a first main surface on one side in the stacking direction and a second main surface opposite to the first main surface, and a first main surface of the third pedestal portion. a fourth fitting portion formed;
It is preferable that each of the first fitting part, the second fitting part, the third fitting part, and the fourth fitting part has one of the convex part and the concave part.

(1.2.1) First Spacer The first spacer may have a first pedestal, a first fitting part, and a second fitting part. The first pedestal part is a plate-like object and has a first main surface on one side in the stacking direction and a second main surface on the opposite side of the first main surface. The first fitting portion is formed on the first main surface of the first pedestal portion. The second fitting portion is formed on the second main surface of the first pedestal portion. The first pedestal part, the first fitting part, and the second fitting part are integrated.
The shape of the first pedestal is not particularly limited, and is appropriately selected depending on the shape of the through hole of the bus bar. The shape of the first pedestal part may be circular, polygonal, irregular, etc. in plan view. “Plane view” refers to viewing from a direction perpendicular to the first main surface of the first pedestal. Examples of polygons include triangles, quadrilaterals, pentagons, hexagons, and heptagons. Examples of the triangle include an equilateral triangle, a right triangle, and an isosceles triangle. Examples of the quadrilateral include a square, a rectangle, a parallelogram, and a trapezoid.

The first spacer is, for example, a molded body of the first resin composition. The first spacer includes an injection molded product or a press molded product.
The resin component of the first resin composition is not particularly limited, and can be selected depending on the use of the busbar laminate. Examples of the resin component of the first resin composition include thermoplastic resins (including elastomers), thermosetting resins, and the like. Thermoplastic resins (including elastomers) include polyolefin resins, polyvinyl chloride, polyvinylidene chloride, polystyrene resins, acrylonitrile styrene copolymer (AS) resins, acrylonitrile butadiene styrene copolymer (ABS) resins, and polyester resins. , poly(meth)acrylic resin, polyvinyl alcohol, polycarbonate resin, polyamide resin, polyimide resin, polyether resin, polyacetal resin, fluorine resin, polysulfone resin, polyphenylene sulfide resin, polyketone resin, etc. Can be mentioned. Examples of the thermosetting resin include phenol resin, melamine resin, urea resin, polyurethane resin, epoxy resin, and unsaturated polyester resin. These resins may be used alone or in combination of two or more. From the viewpoint of moldability, the resin component of the first resin composition preferably contains a thermoplastic resin.
The first resin composition may contain at least one of a filler and a compounding agent, if necessary. Examples of the filler include various fibers such as glass fiber, carbon fiber, and cellulose fiber, carbon nanotubes (CNT), graphene, carbon particles, clay, talc, silica, and minerals. These fillers may be used alone or in combination of two or more. Examples of compounding agents include heat stabilizers, antioxidants, pigments, weathering agents, flame retardants, plasticizers, dispersants, lubricants, mold release agents, antistatic agents, and the like. These compounding agents may be used alone or in combination of two or more.

(1.2.2) Second Spacer The second spacer may have a second pedestal portion and a third fitting portion. The second pedestal part is a plate-shaped object and has a first main surface on one side in the stacking direction and a second main surface on the opposite side of the first main surface. The third fitting portion is formed on the second main surface of the second pedestal portion. The second pedestal portion and the third fitting portion are integrated.
The shape of the second pedestal part is not particularly limited, and is appropriately selected depending on the shape of the through hole of the bus bar, and may be the same shape as the shape exemplified as the shape of the first pedestal part.
The second spacer is, for example, a molded object of the second resin composition. The second spacer includes an injection molded product or a press molded product. Examples of the second resin composition include those similar to those exemplified as the first resin composition. The second resin composition may be the same as or different from the first resin composition.

(1.2.3) Third Spacer The third spacer may have a third pedestal and a fourth fitting part. The third pedestal part is a plate-like object and has a first main surface on one side in the stacking direction and a second main surface on the opposite side of the first main surface. The fourth fitting portion is formed on the first main surface of the third pedestal portion. The third pedestal part and the fourth fitting part are integrated.
The shape of the third pedestal part is not particularly limited, and is appropriately selected depending on the shape of the through hole of the bus bar, and includes the same shape as the shape illustrated as the shape of the first pedestal part.
The shape of the third spacer may be the same as or different from the shape of the second spacer.
The third spacer is, for example, a molded body of the third resin composition. The third spacer includes an injection molded product or a press molded product. Examples of the third resin composition include those similar to those exemplified as the first resin composition. The third resin composition may be the same as or different from the first resin composition.

(1.2.4) Assembly of electrically insulating spacer assembly In the bus bar laminate, the first fitting portion of the first spacer located closest to one side in the stacking direction of the bus bars among at least one first spacer is , are fitted into the third fitting portion of the second spacer. Thereby, the first spacer and the second spacer, which are located on the most one side in the stacking direction of the bus bar, are integrated.
When there is a plurality of first spacers, the first fitting portion of the first spacer located on the other side of the busbar stacking direction in two adjacent first spacers of the busbar stack is It fits into the second fitting part of the first spacer located on one side. Thereby, the two adjacent first spacers are integrated.
In the bus bar stack, the second fitting portion of the first spacer located on the other side in the stacking direction of the bus bars among the at least one first spacer fits into the fourth fitting portion of the third spacer. . As a result, the first spacer located on the other side in the stacking direction of the bus bar and the third spacer are integrated.
In the bus bar laminate, each of the first main surface and second main surface of the first pedestal, the second main surface of the second pedestal, and the first main surface of the third pedestal is located at the periphery of the through hole of the bus bar. in contact with the department.

(1.3) Resin sealing section The resin sealing section prevents adjacent bus bars stacked at intervals from coming into physical contact with each other. This prevents short circuits between bus bars from occurring.

The shape and size of the resin sealing portion are not particularly limited, and are appropriately selected depending on the use of the laminated bus bar.
The resin sealing portion may be formed by insert molding or welding.
In insert molding, an insert product is inserted into a mold, and a molten material of the resin sealing portion is injected into a predetermined portion of the outer surface of the insert product to form a resin sealing portion. The insert consists of at least two busbars and at least one electrically insulating spacer assembly.
Welding includes thermal welding, vibration welding, laser welding, ultrasonic welding, or hot plate welding.
The resin sealing portion is preferably formed by insert molding. Thereby, the resin sealing part enters into the gap between the uneven parts of the bus bar in contact with the resin sealing part more reliably than when the resin sealing part is formed by welding. Therefore, the resin sealing portion is more strongly fixed to the bus bar. As a result, the airtightness of the busbar laminate can be maintained for a longer period of time.

The resin sealing portion is a molded body of the fourth resin composition. The fourth resin composition is appropriately selected depending on the type of the first resin composition and the like.
Examples of the fourth resin composition include those similar to those exemplified as the first resin composition. The fourth resin composition may be the same as or different from the first resin composition.
It is preferable that the fourth resin composition contains a resin that is compatible with each resin component of the first resin composition, the second resin composition, and the third resin composition. That is, it is preferable that the at least one electrically insulating spacer assembly is made of resin, and that the at least one electrically insulating spacer assembly and the resin sealing part are fused together. This makes it difficult for a gap to occur between the electrically insulating spacer assembly and the resin sealing part. As a result, the busbar laminate has better airtightness.

"Having compatibility" means that the resin sealing part and the electrically insulating spacer assembly are each formed in an atmosphere where the resin components forming each of the resin sealing part and the electrically insulating spacer assembly are melted. Indicates that the resin components mix without separating.
"The resin sealing part and the electrically insulating spacer assembly are fused together" means that the resin sealing part and the electrically insulating spacer assembly are fused together at room temperature (e.g. 23°C) without the use of adhesives, screws, etc. This indicates that the spacer assembly is firmly attached.

(2) Embodiment Hereinafter, bus bar laminates according to the first embodiment to the second embodiment will be described with reference to FIGS. 1 to 8.

(2.1) First Embodiment A busbar laminate according to a first embodiment will be described with reference to FIGS. 1 to 6.

The busbar laminate 1A according to the first embodiment includes three busbars 10A, one electrically insulating spacer assembly 20, and a resin sealing part 30, as shown in FIGS. 1 and 2. The bus bar 10A is a long plate-like object.

One longitudinal side of the bus bar 10A is defined as an X-axis positive direction, and the opposite side is defined as an X-axis negative direction. One side in the thickness direction of the bus bar 10A (that is, the direction perpendicular to the main surface of the bus bar 10A) is defined as the Y-axis positive direction, and the opposite side is defined as the Y-axis negative direction. One side of the bus bar 10A in the lateral direction is defined as the Z-axis positive direction, and the opposite side is defined as the Z-axis negative direction.

The bus bar laminate 1A is used, for example, to electrically connect a motor and an inverter using ATF for cooling the motor.
The dimensions of the busbar laminate 1A are not particularly limited. The length of the busbar laminate 1A in the X-axis direction is, for example, 50 mm to 500 mm, the length of the busbar laminate 1A in the Y-axis direction is, for example, 30 mm to 200 mm, and the length of the busbar laminate 1A in the Z-axis direction is, for example, 50 mm to 500 mm. The length is, for example, 30 mm to 200 mm.

(2.1.1) Busbar As shown in FIG. 3, the busbar 10A is a long metal plate. The bus bar 10A has a first main surface TS10A and a second main surface BS10A on the opposite side of the first main surface TS10A (ie, on the Y-axis negative direction side).
The bus bar 10A has a portion RA that contacts the resin sealing portion 30 (hereinafter referred to as “contact portion RA”) and a portion RB that does not contact the two resin sealing portions 30 (hereinafter referred to as “non-contact portion RB”). ). The non-contact portion RB, the contact portion RA, and the non-contact portion RB are located in this order from one end of the bus bar 10A to the other end in the X-axis direction.

The bus bar 10A has an uneven structure at the contact area RA. The state of the uneven structure of the contact portion RA is the same as that illustrated as the state of the uneven structure of the portion that contacts the resin sealing portion.
Bus bar 10A has one through hole TH at contact area RA. The shape of the through hole TH is circular. The through hole TH is located at the center of the bus bar 10A in the X-axis direction and the Z-axis direction. In the first embodiment, the diameter of the through hole TH is 2 mm or less.

The bus bar 10A has a terminal portion 11 and a terminal portion 12 in the non-contact portion RB. The terminal portion 11 is located at a non-contact portion RB on the positive side of the X-axis. The terminal portion 12 is located at a non-contact portion RB on the negative side of the X-axis.
The terminal portion 11 is electrically connected to a terminal of a motor that uses ATF for motor cooling. The terminal portion 12 is electrically connected to a terminal of an inverter. Therefore, when the busbar laminate 1A is used, the contact portion RA of the busbar 10A including the terminal portion 11 is immersed in ATF, whereas the non-contact portion RB of the busbar 10A including the terminal portion 12 is immersed in ATF. Not yet.

In the first embodiment, the material of the bus bar 10A contains at least one of copper and aluminum.

The thickness L1 (that is, the length L1 in the Y-axis direction) of the bus bar 10A (see FIG. 3) is preferably 1 mm to 5 mm, more preferably 2 mm to 3 mm.

The three bus bars 10A are stacked along the Y-axis direction so that their main surfaces face each other. The through holes TH of each of the three bus bars 10A face each other in adjacent bus bars 10A. In other words, the central axes of the through holes TH of the three bus bars 10A are aligned and extend along the Y-axis direction.
In this way, each of the three bus bars 10A has the terminal portion 11 and the terminal portion 12, and the three bus bars 10A are stacked.

Hereinafter, among the three stacked busbars 10A, the busbar 10A located on the negative side of the Y-axis is also referred to as "busbar 10A ₁ ", and the busbar 10A located in the center in the Y-axis direction is also referred to as "busbar 10A ₂ ", The busbar 10A located on the positive side of the Y-axis is also referred to as a "busbar 10A ₃ ."

(2.1.2) Electrically Insulating Spacer Assembly The electrically insulating spacer assembly 20 maintains the distance between adjacent busbars 10A among the three busbars 10A. The electrically insulating spacer assembly 20 is provided in the through hole TH.
As shown in FIG. 2, the electrically insulating spacer assembly 20 includes two first spacers 21, one second spacer 22, and one third spacer 23. Each of the two first spacers 21 is arranged between adjacent bus bars 10A (that is, between bus bar 10A ₁ and bus bar 10A ₂ , and between bus bar 10A ₂ and bus bar 10A ₃ ). The second spacer 22 is arranged on one side in the stacking direction (i.e., on the positive Y-axis side) of the bus bar 10A (i.e., bus bar 10A ₃ ), which is located on the most one side in the stacking direction (Y-axis direction) of the three bus bars. has been done. The third spacer 23 is arranged on the other side in the stacking direction (i.e., on the negative Y-axis side) of the bus bar 10A (i.e., bus bar 10A ₁ ) located on the other side in the stacking direction (Y-axis direction) of the three bus bars. has been done.

The first spacer 21 has a base portion 211, a convex portion 212, and a concave portion 213, as shown in FIG. The pedestal part 211 is a cylindrical plate-like object, and has a first main surface TS211 on one side in the stacking direction (i.e., the Z-axis positive direction side) and a first main surface TS211 on the opposite side of the first main surface TS211 (i.e., the Z-axis negative direction side). ) and a second main surface BS211. The convex portion 212 has a cylindrical shape and protrudes from the first main surface TS211 in the positive direction of the Z-axis. The recess 213 has a cylindrical concave shape and is depressed from the second main surface BS211 in the positive direction of the Z-axis.
The diameter L2 (see FIG. 4) of the pedestal portion 211 is preferably 2 mm to 15 mm, more preferably 3 mm to 15 mm. The height L3 of the pedestal portion 211 (that is, the length L3 of the pedestal portion 211 in the Z-axis direction) (see FIG. 3) is preferably 0.5 mm to 10 mm, more preferably 1 mm to 3 mm.
In the first embodiment, the diameter L4 (see FIG. 4) of the convex portion 212 is equivalent to the diameter of the through hole TH, preferably 0.5 mm to 2 mm, more preferably 0.8 mm to 1.5 mm. The height L5 of the convex portion 212 (that is, the length L5 of the convex portion 212 in the Z-axis direction) (see FIG. 4) is preferably 0.5 mm to 5 mm thicker than the thickness L1 of the bus bar 10A (see FIG. 3). , more preferably 1 mm to 3 mm thick.
In the first embodiment, the diameter L4 of the concave portion 213 (see FIG. 4) is equal to the diameter L4 of the convex portion 212. The depth L6 of the recess 213 (that is, the length L6 of the recess 213 in the Z-axis direction) is preferably higher than the height L5 of the projection 212 by 0 mm to 1 mm.

The second spacer 22 has a pedestal portion 221 and a recessed portion 222, as shown in FIG. The pedestal part 221 is a cylindrical plate-like object, and has a first main surface TS221 on one side in the stacking direction (i.e., the Z-axis positive direction side) and a first main surface TS221 on the opposite side of the first main surface TS221 (i.e., the Z-axis negative direction side). ) and a second main surface BS221. The recess 222 has a cylindrical concave shape and is depressed from the second main surface BS222 in the positive direction of the Z-axis.

The third spacer 23 has a pedestal portion 231 and a convex portion 232, as shown in FIG. The pedestal part 231 is a cylindrical plate-like object, and has a first main surface TS231 on one side in the stacking direction (i.e., the Z-axis positive direction side) and a first main surface TS231 on the opposite side of the first main surface TS231 (i.e., the Z-axis negative direction side). ) and a second main surface BS231. The convex portion 232 has a cylindrical shape and protrudes from the first main surface TS231 in the positive direction of the Z-axis. The second main surface BS231 is a plane.

Hereinafter, of the two first spacers 21, the first spacer 21 located on the Y-axis negative direction side is also referred to as "first spacer 21 ₁ ", and the first spacer 21 located on the Y-axis positive direction side is also referred to as "first spacer 21". Also referred to as "spacer 21 ₂ ".

As shown in FIG. 2, the convex portion 232 of the third spacer 23 fits into the concave portion 213 of the first spacer ₂₁₁ via the through hole TH of the bus bar _10A1 . Thereby, the third spacer 23 and the first spacer ₂₁₁ are integrated. The first main surface TS231 of the pedestal section 231 of the third spacer 23 is in contact with the second main surface BS10A of the bus bar _10A1 . The second main surface BS211 of the pedestal section ₂₁₁ of the first spacer 211 is in contact with the first main surface TS10A of the bus bar _10A1 . That is, the third spacer 23 and the first spacer 21 ₁ support the peripheral edge of the through hole TH of the bus bar 10A ₁ .
The convex portion 212 of the first spacer ₂₁₁ fits into the concave portion 213 of the first spacer ₂₁₂ via the through hole TH of the bus bar _10A2 . Thereby, the two first spacers ₂₁₁ are integrated. The first main surface TS211 of the pedestal section ₂₁₁ of the first spacer 211 is in contact with the second main surface BS10A of the bus bar _10A2 . The second main surface BS211 of the base portion 211 of the first spacer ₂₁₂ is in contact with the first main surface TS10A of the bus bar _10A2 . That is, the two first spacers 21 ₁ support the peripheral edge of the through hole TH of the bus bar 10A ₂ .
The convex portion 212 of the first spacer ₂₁₂ fits into the concave portion 222 of the second spacer 22 via the through hole TH of the bus bar _10A3 . Thereby, the first spacer ₂₁₂ and the second spacer 22 are integrated. The first main surface TS211 of the base portion 211 of the first spacer ₂₁₂ is in contact with the second main surface BS10A of the bus bar _10A3 . The second main surface BS221 of the pedestal portion 221 of the second spacer 22 is in contact with the first main surface TS10A of the bus bar _10A3 . That is, the first spacer ₂₁₂ and the second spacer 22 support the peripheral edge of the through hole TH of the bus bar _10A3 .

In the first embodiment, each of the first spacer 21, the second spacer 22, and the third spacer 23 is an integrally molded resin product. The resin integrally molded product includes an injection molded product or a press molded product. The materials of each of the first spacer 21, the second spacer 22, and the third spacer 23 are the same and are the same as those exemplified as the first resin composition. That is, the electrically insulating spacer assembly 20 is made of resin.

(2.1.3) Resin sealing section The resin sealing section 30 is arranged so that the three bus bars 10A and the electrically insulating spacer assembly 20 are arranged so that the terminal section 11 and the terminal section 12 are exposed. is sealed. Specifically, the resin sealing portion 30 covers the contact portions RA of the three bus bars 10A.
The material of the resin sealing part 30 is the same as that exemplified as the fourth thermoplastic resin composition. The resin component of the fourth resin composition is compatible with the resin component of the first resin composition. That is, the resin sealing part 30 and each of the first spacer 21, second spacer 22, and third spacer 23 are fused. That is, the resin sealing part 30 and the electrically insulating spacer assembly 20 are fused together.
The resin sealing portion 30 is formed by insert molding. The resin sealing portion 30 contains a resin that is compatible with the resin contained in the first resin composition.

(2.1.4) Effects As explained with reference to FIGS. 1 to 6, the busbar laminate 1A includes three busbars 10A, an electrically insulating spacer assembly 20, and a resin sealing part 30. Equipped with The electrically insulating spacer assembly 20 includes two first spacers 21 , a second spacer 22 , and a third spacer 23 . Adjacent two of the two first spacers 21, the second spacer 22, and the third spacer 23 are fitted into one body through the through hole TH, and support the peripheral edge of the through hole TH. There is. Each of the three bus bars 10A has an uneven structure at a portion RA that contacts the resin sealing portion 30.
In the busbar laminate 1A, each of the three busbars 10A has an uneven structure at a portion RA that contacts the resin sealing portion 30. As a result, a portion of the resin sealing portion 30 enters into the recess of the uneven structure of the bus bar 10A. As a result, the bus bar 10A is more firmly joined to the resin sealing part 30.
Further, two adjacent first spacers 21, second spacers 22, and third spacers 23 are fitted into each other through the through holes TH and are integrated. Therefore, when manufacturing the busbar laminate 1A by insert molding, only the electrically insulating spacer assembly 20 included in the insert product consisting of the three busbars 10A and the electrically insulating spacer assembly 20 is held, and the insert product is can be set in the mold. As a result, the uneven structure of the portion RA of the bus bar 1-A that contacts the resin sealing portion 30 is less likely to be destroyed than when the insert product is set in the mold by gripping the bus bar 10A included in the insert product.
Furthermore, two adjacent ones of the two first spacers 21, the second spacers 22, and the third spacers 23 support the peripheral edge of the through hole TH. In other words, the area of the portion RA of the bus bar 10A that contacts the resin sealing portion 30 is relatively large.
As a result, the busbar laminate 1A has excellent airtightness.
The bus bar laminate 1A is used for electrical connection between a motor that uses ATF for motor cooling and an inverter. Specifically, the terminal portion 11 is electrically connected to a terminal of a motor that uses ATF for motor cooling, and the terminal portion 12 is electrically connected to a terminal of an inverter. Therefore, when the busbar laminate 1A is used, the non-contact portion RB of the bus bar 10A including the terminal portion 11 is immersed in ATF, whereas the non-contact portion RB of the bus bar 10A including the terminal portion 12 is immersed in ATF. Not immersed. The busbar laminate 1A has excellent airtightness. That is, in the busbar laminate 1A, gaps that induce capillarity are unlikely to occur between the busbar 10A and the resin sealing portion 30. Therefore, the bus bar laminate 1A can more reliably prevent ATF from leaking.

As described with reference to FIGS. 1 to 6, in the bus bar laminate 1A, the diameter of the through hole TH is 2 mm or less. In busbars having the same shape and current density, the smaller the diameter of the busbar through-hole, the thinner the busbar can be made. The diameter of the busbar through-hole included in a conventional busbar laminate is approximately 2.5 mm. The thickness of the bus bar 10A can be made thinner than before.

As described with reference to FIGS. 1 to 6, the electrically insulating spacer assembly 20 is made of resin. The electrically insulating spacer assembly 20 and the resin sealing portion 30 are fused together. In other words, the electrically insulating spacer assembly 20 and the resin sealing portion 30 are strongly adhered to each other. Thereby, a gap is less likely to occur between the electrically insulating spacer assembly 20 and the resin sealing part 30. As a result, the busbar laminate 1A has better airtightness.

As described with reference to FIGS. 1 to 6, the three bus bars 10A contain at least one of copper and aluminum. By including copper in the bus bar 10A, high electrical conductivity of the bus bar 10A can be ensured. Since the bus bar 10A includes aluminum, it is possible to ensure the weight reduction and strength of the bus bar 10A.

(2.2) Second Embodiment A busbar laminate according to a second embodiment will be described with reference to FIGS. 7 and 8.

The busbar laminate 1B according to the second embodiment is different from the busbar laminate 1A according to the first embodiment, except that the shape of the busbar is different and the number of electrically insulating spacer assemblies is two. It has a similar configuration.
As shown in FIGS. 7 and 8, the busbar laminate 1B includes three busbars 10B, two electrically insulating spacer assemblies 20, and a resin sealing section 30. Bus bar 10B is a long plate-like object.

As shown in FIG. 7, the busbar laminate 1B is L-shaped.
Examples of the bus bar laminate 1B include a motor, an inverter, and a battery module. As a battery module, it is used for electrical connection of lithium ion battery modules and the like.
The dimensions of the busbar laminate 1B are not particularly limited. The length L7 (see FIG. 7) of one side of the busbar laminate 1B is, for example, 100 mm to 600 mm. The length L8 (see FIG. 7) of the other side of the busbar laminate 1B is, for example, 100 mm to 600 mm. The length L7 of one side of the busbar laminate 1B and the length L8 of the other side of the busbar laminate 1B may be the same or different.

Bus bar 10B is the same as bus bar 10A except that it is an L-shaped plate.

As described with reference to FIGS. 7 and 8, the busbar laminate 1B includes three busbars 10B, two electrically insulating spacer assemblies 20, and a resin sealing section 30. The electrically insulating spacer assembly 20 includes two first spacers 21 , a second spacer 22 , and a third spacer 23 . Adjacent two of the two first spacers 21, the second spacer 22, and the third spacer 23 are fitted into one body through the through hole TH, and support the peripheral edge of the through hole TH. There is. Each of the three bus bars 10B has an uneven structure at a portion RA that contacts the resin sealing portion 30.
Thereby, the airtightness of the busbar laminate 1B is excellent like that of the busbar laminate 1A.

(3) Method of manufacturing a busbar laminate The method of manufacturing a busbar laminate of the present disclosure is a method of manufacturing the busbar laminate of the present disclosure by insert molding. In the manufacturing method, two of the at least one first spacer, the second spacer, and the third spacer are used to fit each other across one of the at least one through hole. The method includes a step of integrally forming the electrically insulating spacer assembly (hereinafter referred to as an "assembly step").

Since the method for manufacturing a busbar laminate of the present disclosure has the above configuration, a busbar laminate with excellent airtightness can be obtained.
This effect is presumed to be due to the following reasons, but is not limited thereto.
In the method for manufacturing a busbar laminate of the present disclosure, a busbar laminate is manufactured by insert molding. Specifically, insert products obtained in the assembly process are set in a mold and insert molding is performed. When setting the insert product in the mold, according to the present disclosure, the insert product can be set in the mold by gripping only the electrically insulating spacer assembly included in the insert product. As a result, the uneven structure of the portion of the bus bar that contacts the resin sealing portion is less likely to be destroyed than when the insert product is set in the mold by gripping the bus bar included in the insert product. As a result, it is presumed that a busbar laminate with excellent airtightness can be obtained.

Furthermore, since the method for manufacturing a busbar laminate of the present disclosure has the above configuration, even when the insert product is set in the mold, the electrically insulating spacer The insert product can be set in the mold without the parts of the assembly falling.

(3.1) Preparation process The method for manufacturing a busbar laminate according to the present disclosure may include a preparation process. The preparation process is performed before performing the assembly process.

In the preparation step, at least two busbars, at least one first spacer, a second spacer, and a third spacer are prepared.

The method of preparing the bus bar is not particularly limited, and examples include metal forming. Examples of metal forming include roll forming, die casting, cutting, rolling, press forming, extrusion forming, and the like.
The method for preparing the first spacer is not particularly limited, and examples include resin molding of the first resin composition. Examples of resin molding include injection molding, cast molding, press molding, extrusion molding, and transfer molding.
The method for preparing the second spacer is not particularly limited, and examples include resin molding of the second resin composition.
The method for preparing the third spacer is not particularly limited, and examples include resin molding of the third resin composition.

(3.2) Roughening Step When the method for manufacturing a busbar laminate according to the present disclosure includes a preparation step, it may include a roughening step. The roughening step is performed after the preparation step is performed and before the assembly step is performed.

In the roughening step, a roughening treatment is performed on the portions of at least two bus bars that contact the resin sealing portions. The roughening treatment is not particularly limited, and any known method may be used.
In the roughening step, after the roughening treatment, a treatment for adding a functional group may be performed from the viewpoint of improving the bonding strength. The process of adding a functional group may be performed by any known method.

(3.3) Assembly process The method for manufacturing a busbar laminate according to the present disclosure includes an assembly process. In this way, an insert product is obtained.

In the assembly process, as described above, two of the at least one first spacer, the second spacer, and the third spacer are used to fit each other across one of the at least one through hole. and together form an electrically insulating spacer assembly.

The method of fitting two of the first spacer, second spacer, and third spacer is not particularly limited, and known methods may be used.

(3.4) Insert molding process The method for manufacturing a busbar laminate according to the present disclosure may include an insert molding process.
The insert molding process is performed after the assembly process is performed.

In the insert molding step, the melt of the resin sealing portion (that is, the melt of the fourth resin composition) is injected into a predetermined portion of the outer surface of the insert product to form the resin sealing portion.

Specifically, an injection molding machine is used for insert molding. The injection molding machine includes an injection mold, an injection device, and a mold clamping device. The injection mold includes a movable mold and a fixed mold. The stationary mold is fixed to the injection molding machine. The movable mold is movable relative to the fixed mold. The injection device injects the melt of the fourth resin composition into the sprue of the injection mold at a predetermined injection pressure. The mold clamping device clamps the movable mold at high pressure so that the movable mold does not open due to the filling pressure of the melt of the fourth resin composition.
First, the movable mold is opened, the insert product is placed on the fixed mold, the movable mold is closed, and the mold is clamped. That is, the insert product is housed within an injection mold. Thereby, a molding space for forming a resin sealing part is formed between the insert product and the injection mold.
Next, the injection molding machine fills the molding space with the melt of the fourth resin composition under high pressure.
Next, the melt of the fourth resin composition in the injection mold is cooled and solidified. As a result, a resin sealing portion is formed at a predetermined portion of the outer surface of the insert product. In other words, the busbar laminate of the present disclosure is obtained.

1A, 1B Busbar laminate 10A, 10B Busbar 11, 12 Terminal portion 20 Electrically insulating spacer assembly 21 First spacer 211 Pedestal portion 212 Convex portion 213 Recessed portion 22 Second spacer 221 Pedestal portion 222 Recessed portion 23 Third spacer 231 Pedestal portion 232 Convex portion 30 Resin sealing part TH Through hole RA Part that contacts the resin sealing part RB Part that does not contact the resin sealing part

Claims (6)

at least two stacked busbars having at least two terminal portions;
at least one electrically insulating spacer assembly that maintains a distance between adjacent bus bars of the at least two bus bars;
a resin sealing part that seals the at least two bus bars and the at least one electrically insulating spacer assembly so that the at least two terminal parts are exposed;
Equipped with
Each of the at least two bus bars has at least one through hole that faces each other between the adjacent bus bars,
the at least one electrically insulating spacer assembly is provided for each through hole, corresponding to the at least one through hole;
The at least one electrically insulating spacer assembly comprises:
at least one first spacer disposed between the adjacent bus bars;
one second spacer disposed on one side of a bus bar in the stacking direction of the at least two bus bars, which is located on one side of the at least two bus bars in the stacking direction;
one third spacer disposed on the other side in the stacking direction of the bus bar located on the othermost side in the stacking direction of the at least two bus bars,
One of the two adjacent ones of the at least one first spacer, the second spacer, and the third spacer has a convex portion, and the other has a concave shape into which the convex portion fits,
The two adjacent ones are fitted into one body through one of the at least one through hole, and support a peripheral edge of the one through hole,
Each of the at least two bus bars has an uneven structure at a portion that contacts the resin sealing portion. The busbar laminate according to claim 1, wherein the through hole has a diameter of 2 mm or less. The at least one first spacer is
a first pedestal portion having a first main surface on one side in the stacking direction and a second main surface on the opposite side of the first main surface;
a first fitting part formed on the first main surface of the first pedestal part;
a second fitting portion formed on the second main surface of the first pedestal portion;
The second spacer is
a second pedestal portion having a first main surface on one side in the stacking direction and a second main surface on the opposite side of the first main surface;
a third fitting part formed on the first main surface of the second pedestal part;
has
The third spacer is
a third pedestal portion having a first main surface on one side in the stacking direction and a second main surface on the opposite side of the first main surface;
a fourth fitting part formed on the first main surface of the third pedestal part;
has
The bus bar laminate according to claim 1 or 2, wherein each of the first fitting part, the second fitting part, the third fitting part, and the fourth fitting part has one of the convex part and the concave part. body. the at least one electrically insulating spacer assembly is made of resin;
The bus bar laminate according to claim 1 or 2, wherein the at least one electrically insulating spacer assembly and the resin sealing portion are fused. The busbar laminate according to claim 1 or 2, wherein the at least two busbars contain at least one of copper and aluminum. A method of manufacturing the busbar laminate according to claim 1 or 2 by insert molding,
Two of the at least one first spacer, the second spacer, and the third spacer are fitted together with one through hole of the at least one through hole interposed therebetween. . A method of manufacturing a busbar laminate, comprising the step of forming the electrically insulating spacer assembly.