CN110739562B - Bus bar and electric wire connecting structure and bus bar module - Google Patents

Abstract

Provided are a connection structure capable of improving reliability of electrical connection at a connection position therebetween, and a bus bar module using the connection structure. The connection structure 5 includes the electric wire 1, the bus bar 11, and the connection jig 70. The bus bar 11 is electrically connected to the conductor core wire 2 of the electric wire 1. The bus bar 11 includes a bus bar main body 12 and an arm portion 13 extending from the bus bar main body 12. The attaching jig 70 is configured to set the electric wire 1 at a predetermined position in the extending direction and the width direction of the arm portion 13 by engaging with the arm portion 13 while holding the electric wire 1. When the electric wire 1 is disposed at a predetermined position, the conductor core wire 2 is electrically connected to the bus bar 11.

Description

Connection structure of bus bar and wire and bus bar module

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is based on and claims the benefit of priority from Japanese Patent Application No. 2018-135075 filed on Jul. 18, 2018, the entire contents of which are incorporated herein by reference.

technical field

The present invention relates to a connection structure for connecting a bus bar to an electric wire using a connection jig, and a bus bar module using the connection structure.

Background technique

A connection structure in the related art for electrically connecting a bus bar and an electric wire connects the conductor core wire of the electric wire to the arm portion extending from the bus bar main body by a joining method such as ultrasonic bonding. For example, in one of such connection structures, when the conductor core wire is ultrasonically bonded to the arm portion, the extension portion from the side surface of the arm portion is bent toward the electric wire; the electric wire is held pressed against the arm portion by the extension portion (eg, See JP-A-2016-048635).

In the above connection structure, when the operator bends the extension to press the electric wire against the arm portion, the position of the electric wire relative to the arm portion may not always be as designed (ie, positional deviation may occur). Even if the wire remains in the designed position, the holding force may not always remain sufficient due to the elastic recovery of the shape of the extension, which may cause the position of the wire to shift during ultrasonic bonding. When the positional deviation of the electric wire with respect to the arm portion occurs due to this reason, the conductor core wire and the arm portion may not be sufficiently electrically connected, resulting in reduced reliability of the electrical connection therebetween.

SUMMARY OF THE INVENTION

The present invention has been made in view of the above situation, and its object is to provide a connection structure of a bus bar and an electric wire, which can improve the reliability of the electrical connection at the connection position between the bus bar and the electric wire, and also provides a connection structure using the connection structure. the bus bar module.

In order to achieve the above objects, the connection structure and the bus bar module according to the present invention have the following features (1) to (5).

(1) A first aspect of the present invention provides a connection structure, comprising:

bus bar;

Wires with conductor cores; and

connecting fixture,

Among them, the bus bar includes:

the bus bar body; and

an arm portion extending from the busbar body;

wherein the connection jig is configured to set the electric wire at a predetermined position in the extending direction and the width direction of the arm portion by engaging with the arm portion while holding the electric wire; and

Among them, the conductor core wire is electrically connected to the bus bar in a state where the electric wire is provided at a predetermined position.

(2) In the connection structure according to (1), the connection fixture includes:

a holding section, configured to hold the wires;

a gripping portion configured to limit displacement of the connecting jig relative to the arm portion in the width direction by gripping the arm portion in the width direction; and

The abutting portion is configured to restrict displacement of the connecting clip relative to the arm portion in the extending direction by abutting the abutted portion of the arm portion in the extending direction.

(3) In the connection structure according to (2), the arm portion includes a wide portion and a curved portion serving as the abutted portion;

wherein the bent portion is positioned closer to the extension end of the connecting jig than the engaging position of the connecting jig, and is bent in the thickness direction of the arm portion; and

Wherein, the wide portion is positioned closer to the base end of the arm portion than the engaging position, and the width of the wide portion is larger than the gripping width of the gripping portion in the engaging position.

(4) In the connection structure according to any one of (1) to (3), the conductor core wire is ultrasonically bonded to the bus bar; and

The bus bar is configured such that an angle between the side surface of the arm portion in the width direction and the side surface of the bus bar body is greater than a right angle by gradually increasing the width of the arm portion toward the base end near the base end of the arm portion.

(5) A second aspect of the present invention provides a bus bar module, comprising:

an electric wire wiring body attached to a battery pack including a plurality of unit cells; and

A bus bar, which is accommodated and held in a bus bar accommodating portion provided in an electric wire wiring body, wherein conductor core wires of electric wires routed in the electric wire wiring body are electrically connected to the bus bar.

The bus bar and the conductor core wire of the electric wire are connected by the connection structure according to any one of (1) to (4).

According to the connection structure having the structure in (1), the electric wire is fixed to the bus bar by the connection jig engageable with the arm portion of the bus bar, and the electric wire is fixed to the bus bar by the connection jig engageable with the arm portion of the bus bar The conductor cores of the wires are then connected to the bus bars. Therefore, compared with the connection structure in the related art, the electric wire can be reliably provided to the arm portion at the designed position; even after the electric wire is fixed, the holding force can be maintained reliably. Therefore, as compared with the connection structure in the related art, the positional displacement of the electric wire can be prevented. Therefore, the connection structure having the above-mentioned configuration can improve the reliability of the electrical connection at the connection position between the bus bar and the electric wire.

According to the connection structure having the structure in (2), while the electric wire is held by the holding portion of the connection clamp, the positional deviation of the connection clamp relative to the arm portion can be prevented by the clamp portion and the abutment portion. In addition, the holding portion, the clamping portion, and the abutting portion may be separate members independent of each other and constitute a connecting jig; two of the holding portion, the clamping portion, and the abutting portion may be integral members and constituted by assembling the remaining members connecting clamps; and all of the retaining portion, the clamping portion, and the abutting portion may be a unitary member.

According to the connecting structure having the structure in (3), the connecting jig is prevented from being displaced toward the extension end by the curved portion of the arm portion, and the connecting jig is prevented from being displaced toward the base end by the wide portion of the arm portion. Therefore, the position of the connection jig with respect to the arm portion (in other words, the position of the electric wire with respect to the arm portion) can be prevented from being shifted.

According to the connection structure having the structure in (4), in the vicinity of the base end portion of the arm portion, the angle between the side surface of the arm portion in the width direction and the side surface of the bus bar main body can be larger than the case where the width of the arm portion is uniform down angle. Therefore, stress concentration is less likely to occur in the base end portion of the arm portion during ultrasonic bonding, as compared with the case where the width of the arm portion is uniform. As a result, damage to the bus bar due to stress concentration can be prevented.

According to the bus bar module having the configuration in (5), compared with the case of using the connection structure in the related art, it is possible to prevent the positional deviation of the electric wire relative to the bus bar and improve the connection position between the bus bar and the electric wire The reliability of the electrical connection at the bus bar module.

According to the present invention, a connection structure of a bus bar and an electric wire can be provided, which can improve the reliability of electrical connection at the connection position between them, and a bus bar module using such a connection structure can also be provided.

The present invention has been briefly described above. The details of the present invention will be further elucidated by reading modes for carrying out the present invention described below (hereinafter, referred to as "embodiments") with reference to the accompanying drawings.

Description of drawings

1 is a perspective view showing a connection structure of a bus bar and an electric wire according to an embodiment;

2A is a side view of a main part of the connection structure of FIG. 1; FIG. 2B is a plan view of the main part; FIG. 2C is a plan view of an arm part of a bus bar;

3 is an exploded perspective view of a main part of the connection structure of FIG. 1;

4A is an enlarged side view of part A of FIG. 3 when viewed from the width direction; FIG. 4B is an enlarged side view of part B of FIG. 3 when viewed from the width direction;

5 is a plan view of a power supply device to which a bus bar module is attached, wherein the connection structure in FIG. 1 is applied to the bus bar module;

6 is a plan view around the connection structure in FIG. 1 applied to the bus bar module in FIG. 5;

7A is an exploded perspective view of a main part of a connection structure according to a modification of the embodiment; FIG. 7B is a perspective view of the main part.

Detailed ways

<Example>

Hereinafter, a connection structure of a bus bar and an electric wire according to an embodiment of the present invention, and a bus bar module using the connection structure will be described with reference to the accompanying drawings.

As shown in FIGS. 1 to 4 , the connection structure 5 according to the embodiment of the present invention includes an electric wire 1 , a bus bar 11 and a connection fixture 70 . The bus bar 11 is electrically connected to the conductor core wire 2 of the electric wire 1 .

Hereinafter, for convenience of description, the x-axis direction, the y-axis direction, and the z-axis direction are defined as shown in FIGS. 1 to 4 . The x-axis direction, the y-axis direction, and the z-axis direction are orthogonal to each other, and are also referred to as an extension direction, a width direction, and an up-down direction. First, the structures of the electric wire 1, the bus bar 11 and the connection jig 70 will be described below.

The electric wire 1 includes a conductor core wire 2 made of metal (usually made of copper) and a resin insulating coating 3 covering the outer periphery of the conductor core wire 2 . In this embodiment, the conductor core wire 2 includes a bundle of multiple wires, but may also include one wire. At a predetermined length from one end of the electric wire 1 , the insulating coating 3 is removed to expose the conductor core wire 2 . The exposed end portion 2 a of the conductor core wire 2 described below is ultrasonically bonded to the bus bar 11 .

The metal bus bar 11 includes a bus bar body 12 and an arm portion 13 . The bus bar 11 is formed, for example, by pressing a plate member made of a conductive metal material (usually, an aluminum material). As described below, from the viewpoint of improving the reliability of electrical connection when attaching the bus bar 11 to a target (eg, the unit cell 42 in FIG. 5 ), the bus bar 11 is pressed here so as to face upward from the lower surface The surface (in the positive z-axis direction) is punched. As a result, as shown in FIGS. 4A and 4B (enlarged side views of parts A and B in FIG. 3 ), the upper surface end portions a1 and b1 on the end surface (pressing surface) of the bus bar 11 are deformed to extend in the pressing direction . On the other hand, the lower surface end portions a2 and b2 on the end surface (punch surface) of the bus bar 11 are deformed to be rounded in the punching direction. Typically, the former is called a glitch, while the latter is called a sag.

The bus bar body 12 has a rectangular flat plate shape. The arm portion 13 is a rectangular flat plate portion extending integrally outward (the negative x-axis direction) in the width direction from a middle portion (side surface in the negative x-axis direction) of the side surface of the bus bar main body 12 . The shape of the bus bar main body 12 is not limited to a rectangular flat plate shape, and may be an oval flat plate shape or the like. The bus bar body 12 may be provided with through holes or the like as required.

Specifically, as shown in FIGS. 2A, 2C, 3 and 4, the arm portion 13 includes a tapered portion 13a extending in a flat plate shape from the side surface of the bus bar main body 12, and continuous in a flat plate shape from the extending end of the tapered portion 13a. The parallel portion 13b, and the curved portion 13c at the extending end of the parallel portion 13b.

The width of the tapered portion 13a gradually increases from the extending end toward the base end along the extending direction. The width of the parallel portion 13b is constant throughout the extending direction to the width of the tapered portion 13a at the extending end. The bent portion 13c is a portion where the extended end portion of the parallel portion 13b is bent downward (in the negative z-axis direction). By bending the bent portion 13c in this way, as shown in FIG. 2 , the electric wire 1 and the sharp burrs (the upper surface end a1 on the end surface of the bent portion 13c shown in FIG. 4A ) generated in the pressing process can be isolated , so that the burr (upper surface end a1 ) does not come into contact with the wire 1 .

Further, since the base end portion of the arm portion 13 is constituted by the tapered portion 13a, the angle θ between the side surface of the base end portion of the arm portion 13 in the width direction and the side surface of the bus bar main body 12 (refer to FIG. 2C ) Can be greater than 90°. In other words, the angle θ is larger than the angle (= 90°).

The resin connection jig 70 is used to fix the electric wire 1 to a predetermined position of the arm portion 13 . Specifically, the connection jig 70 includes the wire holder 20 and the bus bar holder 30, as shown in FIG. 3 .

The wire holder 20 includes a rectangular parallelepiped holder body 21 . The holder main body 21 includes a wire holding portion 22 recessed in a semi-cylindrical shape over the entire area in the extending direction in an intermediate portion in the width direction of the center of the lower surface. The holder main body 21 includes a pair of protruding portions 23 extending in the extending direction on both side surfaces in the width direction. The inner diameter of the electric wire holding portion 22 is slightly smaller than the outer diameter of the insulating coating 3 of the electric wire 1 . Therefore, by accommodating the electric wire 1 (the insulating coating 3 of the electric wire 1 ) in the electric wire holding portion 22 , the electric wire 1 can be held by the electric wire holder 20 .

The bus bar holder 30 includes a rectangular flat bottom plate portion 31 and a pair of upright wall portions 32 extending upward from both widthwise ends of the bottom plate portion 31 and facing each other in the widthwise direction. Each upright wall portion 32 includes a pair of column portions 33 extending upward from widthwise ends of the bottom plate portion 31 , and a coupling portion 34 integrally coupling upper ends of the pair of column portions 33 and extending in the extending direction.

The interval in the width direction (the interval between the end surfaces facing each other in the width direction, hereinafter referred to as the "nip width") between the pair of upright wall portions 32 (more specifically, the column portions 33 ) in the width direction. It is slightly larger than the width of the parallel portion 13 b of the arm portion 13 of the bus bar 11 . The length of the bottom plate 31 in the extending direction is slightly smaller than the length of the parallel portion 13b in the extending direction. Therefore, the bus bar holder 30 can be placed on the upper surface of the bottom plate portion 31 so as to sandwich the parallel portion 13 b of the arm portion 13 of the bus bar 11 between the pair of upstanding wall portions 32 .

The width of the tapered portion 13a of the arm portion 13 is larger than the clamping width in the range from the position where the extension end of the tapered portion 13a is slightly moved toward the base end to the base end of the tapered portion 13a. That is, the width of the tapered portion 13a is larger than that of the parallel portion 13b in the range from the position where the extending end of the tapered portion 13a is slightly moved toward the base end to the base end of the tapered portion 13a. Therefore, the bus bar holder 30 is prevented from being displaced to approach the base end of the tapered portion 13a in the extending direction of the bus bar 11 (details will be described below). The width of the holder main body 21 (cuboid portion) of the wire holder 20 in the width direction is slightly smaller than the clamping width, and the width between the protruding ends of the pair of protruding portions 23 in the width direction is slightly larger than the clamping width. The length of the protruding portion 23 in the extending direction is smaller than the interval in the extending direction of the pair of column portions 33 (the interval between the end faces facing each other in the extending direction).

The structures of the electric wire 1 , the bus bar 11 and the connection jig 70 have been described above.

Next, a process of obtaining the connection structure 5 (see FIG. 1 ) by electrically connecting the conductor core wires 2 of the electric wires 1 to the bus bars 11 will be described with reference to FIGS. 2A to 2C and 3 . First, as shown in FIG. 3 , the electric wire 1 is held in the electric wire holder 20 by accommodating the insulating coating 3 in the vicinity of the conductor core wire 2 exposed at one end of the electric wire 1 in the electric wire holding portion 22 of the electric wire holder 20 . The exposed conductor core wire 2 of the electric wire 1 protrudes outward from the holder main body 21 in the extension direction (x-axis positive direction).

Next, the bus bar holder 30 places the parallel portions 13 b of the arm portions 13 of the bus bars 11 on the upper surface of the bottom plate portion 31 to sandwich the parallel portions 13 b between the pair of upright wall portions 32 . Next, the holder main body 21 of the wire holder 20 holding the wire 1 is pushed downward from above to the space between the pair of upstanding wall portions 32 of the bus bar holder 30 in which the arm portion 13 is placed.

At this time, the pair of protruding portions 23 first press the pair of upright wall portions 32 (more specifically, the pair of coupling portions 34). Therefore, the pair of upstanding wall portions 32 are elastically deformed outward in the width direction (directions away from each other). By further pushing the holder main body 21, when the pair of protruding portions 23 enters under the pair of coupling portions 34, the shapes of the pair of elastically deformed upright wall portions 32 are elastically restored (see FIG. 2A).

When the shape of the upright wall portion 32 is elastically restored in this way, the pair of protruding portions 23 and the pair of coupling portions 34 are engaged. As a result, the parallel portion 13b of the arm portion 13 is sandwiched by the wire holder 20 and the bus bar holder 30 in the up-down direction. Therefore, the electric wire 1 is appropriately fixed to a predetermined position (eg, a design position) on the upper surface of the arm portion 13 so that the exposed conductor core wire 2 of the electric wire 1 extends on the upper surface of the arm portion 13 in the extending direction.

In this state, the pair of upright wall portions 32 sandwich the arm portion 13 in the width direction. Therefore, the displacement of the connection jig 70 (the wire holder 20 + the bus bar holder 30 ) relative to the arm portion 13 in the width direction is restricted. Further, an end surface (an end surface in the negative x-axis direction) of the bottom plate portion 31 of the bus bar holder 30 in the extending direction abuts the bent portion 13c of the arm portion 13 in the extending direction. Therefore, the connection jig 70 (the wire holder 20 + the bus bar holder 30 ) is restricted from being displaced to its end (the negative x-axis direction) in the extending direction relative to the arm portion 13 . In addition, the other ends in the extending direction (ends in the positive x-axis direction) of the pair of upright wall portions 32 (more specifically, the column portions 33 ) of the bus bar holder 30 abut against the tapered portion of the arm portion 13 13a is a side surface in the width direction. Therefore, the connection jig 70 (the wire holder 20 + the bus bar holder 30 ) is restricted from being displaced to the other end (x-axis positive direction) in the extending direction relative to the arm portion 13 .

In the present embodiment, the holder main body 21 and the bottom plate portion 31 correspond to a "holding portion" in the present invention; a pair of upright wall portions 32 correspond to a "holding portion" in the present invention; the bottom plate portion 31 in the extending direction The end surface (the end surface in the negative direction of the x-axis) and the other end portion (the end in the positive direction of the x-axis) of the pair of upright wall portions 32 in the extending direction correspond to the "abutting portion" in the present invention; the arm The curved portion 13c of the portion 13 corresponds to the "abutted portion" and the "bent portion" in the present invention; the tapered portion 13a of the arm portion 13 corresponds to the "abutted portion" and "wide portion" in the present invention; And the parallel portion 13b of the arm portion 13 corresponds to the "engagement position" in the present invention.

Next, as described above, the end portion 2a of the exposed conductor core wire 2 of the wire 1 on which the wire 1 is fixed at a predetermined position is joined to the upper surface of the arm portion 13 by a known method . Generally, ultrasonic bonding can be employed as the bonding method. However, the present invention is not limited to this, and other bonding methods such as welding may be used.

The connection structure 5 according to the embodiment shown in FIG. 1 can be obtained through the above process.

Next, a case where the connection structure 5 according to the embodiment is applied to the bus bar module 41 will be described with reference to FIGS. 5 and 6 .

As shown in FIG. 5 , a bus bar module 41 is attached to a battery pack 43 including a plurality of unit cells 42 to constitute a power supply device 44 . The power supply device 44 is mounted on, for example, an electric vehicle that runs using an electric motor and a hybrid vehicle that runs using a combination of an engine and an electric motor, so as to supply power to the electric motor.

The bus bar module 41 includes an electric wire wiring body 45 made of resin. The bus bar 11 is held in the wire wiring body 45 (specifically, see FIG. 6 ). The bus bar 11 is welded to an electrode (not shown) protruding from each of the plurality of unit cells 42 constituting the battery assembly 43 . The bus bar 11 is connected to, for example, a terminal of the electric wire 1 which is connected to a voltage detection device (not shown). The electrodes of the bus bar 11 and the unit cells 42 do not have to be welded. For example, when the electrodes of the unit cells 42 are inserted into through holes provided in the bus bar 11, the bus bar 11 and the electrodes of the unit cells 42 may be fastened together by nuts or the like. The sag (lower surface end portion b2 on the end surface of the bus bar main body 12 ) generated during the pressing process faces the unit cells 42 , as shown in FIG. 4B , whether in the case of welding or fastening. Therefore, compared with the case where the burrs (the upper surface end portions b1 ) face the single cells 42 , the lower surface of the bus bar main body 12 and the single cells 42 can be brought into close contact with each other more appropriately, and the bus bar 11 and the single cells 42 can be improved. The electrical connection reliability between the bulk cells 42 is improved.

As shown in FIG. 6 , the wire wiring body 45 includes a bus bar accommodating portion 51 having a frame shape so that the bus bar main body 12 of the bus bar 11 is accommodated and held in the bus bar accommodating portion 51 . A part of the peripheral wall 53 constituting the bus bar accommodating portion 51 is opened so that the arm portion 13 of the bus bar 11 is located in the opening portion.

The wire wiring body 45 includes a wire wiring groove 55 connected to the opening portion of the bus bar accommodating portion 51 so that the wire 1 is accommodated in the wire wiring groove 55 . Both sides of the wire routing groove 55 are constituted by a pair of side walls 56A and 56B. The wire routing groove 55 includes a wire holding portion 61 that holds the wire 1 accommodated therein.

As shown in FIG. 6 , the wire wiring body 45 includes a pair of support walls 52 in the opening portion of the bus bar accommodating portion 51 . The support walls 52 are provided on both sides orthogonal to the extending direction of the arm portion 13 extending from the bus bar main body 12 , and sandwich the pair of upright wall portions 32 of the bus bar holder 30 . A pair of upstanding wall portions 32 hold the electric wire 1 and the arm portion 13 in the width direction.

Therefore, even when an external force acts on the arm portion 13 in the direction orthogonal to the extending direction of the arm portion 13 (y-axis direction), since the electric wire 1 is pulled or the like during its operation, both side portions of the arm portion 13 are It is supported by the support wall 52 of the wire wiring body 45 so that the arm portion 13 can be prevented from being deformed by an external force. Furthermore, even when such an external force acts, the external force does not directly reach the end portion 2 a (ultrasonic bonding position) of the conductor core wire 2 because the electric wire 1 is held by the connection jig 70 . Therefore, separation of the end portion 2a from the bus bar 11 can be prevented. As a result, the reliability of the electrical connection between the electric wire 1 and the bus bar 11 can be further improved.

As described above, according to the connection structure 5 of the embodiment of the present invention, and the bus bar module 41 , the electric wires are fixed by the connection jig 70 (the wire holder 20 + the bus bar holder 30 ) which can be engaged with the arm portion 13 of the bus bar 11 . After the position of 1, the conductor core 2 of the electric wire 1 is electrically connected to the bus bar 11. Therefore, the positional deviation of the electric wire 1 is less likely to occur compared to the connection structure in the related art. As a result, the reliability of the electrical connection between the bus bar 11 and the electric wire 1 can be properly maintained.

Further, since the pair of upright wall portions 32 clamp the arm portion 13 in the width direction, the displacement of the connection jig 70 relative to the arm portion 13 in the width direction is restricted. Since the end surface of the bottom plate portion 31 of the bus bar holder 30 in the extending direction (the end surface in the negative x-axis direction) abuts the bent portion 13c of the arm portion 13 in the extending direction, the connection jig 70 is restricted relative to the arm portion 13 Displaced to its end (negative x-axis direction) in the extension direction. Since the other ends in the extending direction (ends in the positive x-axis direction) of the pair of upright wall portions 32 of the bus bar holder 30 abut the side surfaces of the tapered portions 13 a of the arm portions 13 in the width direction, restricting The connection jig 70 is displaced toward the other end (x-axis positive direction) in the extending direction with respect to the arm portion 13 . As a result, the positional displacement of the connection jig 70 relative to the arm portion 13 can be reliably prevented. As a result, the positional displacement of the electric wire 1 when the conductor core wire 2 is connected to the bus bar 11 can be prevented more reliably. Since the upper surface end portion a1 (burrs caused by the pressing process) on the end surface of the bent portion 13c is isolated from the electric wire 1, the electric wire 1 can be prevented from being damaged by the upper surface end portion a1 which may have a sharp shape.

Further, in the vicinity of the base end portion of the arm portion 13 , the angle θ (refer to FIG. 2C ) between the side surface of the arm portion 13 (tapered portion 13 a ) in the width direction and the side surface of the bus bar main body 12 may be larger than that of the arm portion (refer to FIG. 2C ). The angle of the case where the width is uniform. As a result, stress concentration hardly occurs in the base end portion of the arm portion 13 during ultrasonic bonding, and damage to the bus bar due to the stress concentration can be prevented.

<Other Examples>

The present invention is not limited to the above-described embodiments, and various modifications can be employed within the scope of the present invention. For example, the present invention is not limited to the above-described embodiments, and can be appropriately modified, improved, and the like. The materials, shapes, sizes, numbers, arrangement positions, etc. of the constituent elements in the above-described embodiments are optional as long as the present invention can be realized, and the present invention is not limited thereto.

For example, in the above-described embodiment, as shown in FIG. 3 and the like, the connection jig 70 includes two parts, that is, the wire holder 20 and the bus bar holder 30 . In contrast, as shown in FIGS. 7A and 7B , the connection jig 70 may include only one component, the wire holder 20 .

In the mode shown in FIGS. 7A and 7B , the holder main body 21 of the wire holder 20 includes a pair of hanging portions 24 that integrally extend downward from both side surfaces of the holder main body 21 in the width direction and facing each other in the width direction. Each of the hanging portions 24 is integrally formed with a protruding portion 25 (lower end portion) protruding inward in the width direction at the extending end portion.

In this mode, when the wire 1 is fixed to a predetermined position on the upper surface of the arm portion 13 , the holder main body 21 of the wire holder 20 holding the wire 1 is first pushed downward to the parallel portion 13 b of the arm portion 13 from above. At this time, first the pair of protruding portions 25 are pressed by the end surfaces of the parallel portions 13b of the arm portions 13 in the width direction, so that the pair of hanging portions 24 are elastically deformed outward (directions away from each other) in the width direction. By further pushing the holder main body 21, when the pair of protruding portions 25 enters under the parallel portion 13b, the shape of the pair of elastically deformed hanging portions 24 is elastically restored.

When the suspension portion 24 is restored in this manner, the pair of protruding portions 25 and the parallel portion 13b of the arm portion 13 are engaged. As a result, the wire holder 20 is held on the arm portion 13 so that the wire 1 is fixed in a predetermined position on the upper surface of the arm portion 13 .

In the above-described embodiment, the bent portion 13c is provided on the extending end portion of the arm portion 13 . However, the structure for restricting the displacement of the connection jig 70 to the extension end of the arm portion 13 is not limited to the bent portion 13c. For example, by making the width of the arm portion 13 at a portion closer to the extension end than the engaging position of the connecting jig 70 larger than the clamping width of the connecting jig 70 (greater than the width of the parallel portion 13b), the connecting jig 70 can be restricted from being displaced. Similarly, the structure for restricting the displacement of the connection jig 70 to the base end of the arm portion 13 is not limited to the tapered portion 13a. For example, displacement of the connecting jig 70 can be restricted by providing a protrusion or the like at a predetermined position of the arm portion 13 closer to the base end than the engaging position of the connecting jig 70 and abutting the protrusion and the connecting jig 70 . Compared with these modes, the bent portion 13c has an advantage in that the electric wire 1 is isolated from burrs due to the pressing process. However, when the contact between the burr and the electric wire 1 is allowed, these modes are advantageous in terms of ease of processing and the like compared with the bent portion 13c.

Here, the features of the connection structure 5 and the bus bar module 41 according to the embodiment of the present invention will be briefly summarized in the following (1) to (5).

(1) A connection structure (5), comprising:

bus bar (11);

a wire (1) having a conductor core (2); and

connection clamp (70),

Wherein, the bus bar (11) includes:

a bus bar body (12); and

an arm portion (13) extending from the bus bar body (12);

wherein the connecting jig (70) is configured to set the wire (1) at a predetermined position (1) in the extending direction and the width direction of the arm portion (13) by engaging the arm portion (13) while holding the wire (1). );and

Among them, the conductor core wire (2) is electrically connected to the bus bar (11) in a state where the electric wire (1) is arranged at a predetermined position.

(2) In the connection structure according to (1), the connection fixture (70) includes:

a holding portion (21, 31) configured to hold the wire (1);

a clamping portion (32) configured to restrict displacement of the connecting jig (70) relative to the arm portion (13) in the width direction by clamping the arm portion (13) in the width direction; and

The abutting portion is configured to restrict displacement of the connecting jig (70) relative to the arm portion (13) in the extending direction by abutting the abutted portions (13a, 13c) of the arm portion (13) in the extending direction.

(3) In the connection structure according to (2), the arm portion (13) includes a wide portion (13a) serving as the abutted portion and a curved portion (13c);

wherein the bent portion (13c) is positioned closer to the extension end of the connecting jig than the engaging position (13b) of the connecting jig (70), and is bent in the thickness direction of the arm portion (13); and

Wherein, the wide portion (13a) is positioned closer to the base end of the arm portion than the engaging position, and the width of the wide portion is larger than the gripping width of the gripping portion (32) in the engaging position (13b).

(4) In the connection structure according to any one of (1) to (3), the conductor core wire (2) is ultrasonically bonded to the bus bar (11); and

Wherein, the bus bar (11) is configured such that by gradually increasing the width of the arm portion (13) in the vicinity of the base end of the arm portion (13) toward the base end, the side surface of the arm portion (13) in the width direction is connected to the bus bar. The angle (θ) between the side surfaces of the main body (12) is greater than a right angle.

(5) A bus bar module (41), comprising:

an electric wire wiring body (45) attached to a battery pack (43) including a plurality of unit cells (42); and

A bus bar (11) that is accommodated and held in a bus bar accommodating portion (51) provided in an electric wire wiring body (45) in which conductor core wires (2) of an electric wire (1) routed in the electric wire wiring body are electrically Connect to bus bar (11).

The bus bar (11) and the conductor core wire (2) of the electric wire (1) are connected by the connection structure (5) according to any one of (1) to (4).

Claims (3)

1. A connection structure, comprising: bus bar; Wires with conductor cores; and connecting fixture, Wherein, the bus bar includes: the bus bar body; and an arm portion extending from the bus bar body; wherein the connection jig is configured to set the electric wire at a predetermined position in the extension direction and the width direction of the arm portion by engaging the arm portion while holding the electric wire; and wherein the conductor core wire is electrically connected to the bus bar in a state where the electric wire is disposed at the predetermined position, Wherein, the connecting fixture includes: a holding portion configured to hold the wire; a gripping portion configured to restrict displacement of the connecting jig relative to the arm portion in the widthwise direction by gripping the arm portion in the widthwise direction; and an abutting portion configured to restrict displacement of the connecting clip relative to the arm portion in the extending direction by abutting the abutted portion of the arm portion in the extending direction, wherein the arm portion includes a wide portion and a curved portion serving as the abutted portion; wherein the bent portion is positioned closer to the extension end of the connecting jig than the engaging position of the connecting jig, and is bent in the thickness direction of the arm portion; and Wherein, the wide portion is positioned closer to the base end of the arm portion than the engaging position, and the width of the wide portion is larger than the width of the arm portion in the engaging position. 2. The connection structure according to claim 1, wherein the conductor core wire is ultrasonically bonded to the bus bar; and Wherein, the bus bar is configured such that the width of the arm portion is gradually increased toward the base end in the vicinity of the base end of the arm portion so that the side surface of the arm portion in the width direction is different from the width of the arm portion. The included angle between the side surfaces of the bus bar body is greater than a right angle. 3. A bus bar module, comprising: an electric wire wiring body attached to a battery pack including a plurality of unit cells; and a bus bar that is accommodated and held in a bus bar accommodating portion provided in the electric wire wiring body to which conductor core wires of electric wires routed in the electric wire wiring body are electrically connected, Wherein, the bus bar and the conductor core wire of the electric wire are connected by the connection structure of any one of claims 1 to 2.

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