KR102421407B1 - Circuit assembly for automotive battery with resistance welding and method of manufacturing the same - Google Patents

Abstract

The present invention relates to a resistance welding structure between a bus bar (10) and a welding ring (21) connected to an FPCB (20), and a plate-shaped bus bar (10) having a plurality of weld emboss (30) formed of a metal material; and an FPCB 20, at least a portion of which is stacked on the bus bar 10, and a metal welding ring 21 provided at an edge of a through hole 22 formed in a part of the FPCB 20, wherein the A step portion 32 is formed in a portion of the welding emboss 30 , and the step portion 32 passes through the through hole 22 and is lower than the height of the portion covered by the welding ring 21 or the It is configured to be formed at the same height as the upper surface of the bus bar 10 . According to the present invention, the welding emboss 30 is exposed to the through-hole 22 of the plate-shaped annular welding ring 21 integrally connected to the FPCB 20 is recessed, so that the electrode P is directly and Since the welding emboss 30 does not come into contact with the electrode P, it is effective in preventing the problem that the FPCB 20 is damaged.

Description

Circuit assembly for automotive battery with resistance welding and method of manufacturing the same}

The field of application of the present invention relates to a resistance welding structure and method for fixing flexible circuit boards (FPCBs) to a bus bar of an electronic product mainly used in a vehicle as small precision welding.

In general, welding refers to a metallurgical joining method in which two or several metals are locally melted and joined using combustible gas or arc heat. Electric welding is one of the types according to the heating method, and electric welding is divided into spot welding and seam welding in detail.

Spot welding is a method of joining by applying pressure when two base materials are stacked on top of each other by flowing an electric current, and when the base materials are melted by contact resistance heat. In detail, there is also a large current method.

Referring to FIG. 1 , a plurality of welding protrusions 3 are formed on the bus bar 1 so as to be in close contact with the conducting portion 2 of the FPCB, and the conducting portion 2 of the FPCB has a plate-shaped annular shape, a hole for riveting. There is this. However, riveting in a narrow space is cumbersome, and resistance welding is used to join the bus bar 1 and the energizing part 2 .

Conventionally, when resistance welding is performed, there is a case in which the welding protrusion 3 exposed through the hole formed in the current-carrying part 2 of the FPCB directly contacts the electrode P as shown in FIG. 2 . After welding, in the process of removing the electrode (P) from the energized part (2), the welding protrusion (3) sticks with the electrode (P) and rises together with the electrode (P). At this time, as the energizing part 2 of the FPCB between the welding protrusion 3 and the electrode P came up together, there was a problem in that the FPCB was torn.

Republic of Korea Patent Publication No. 10-2016-0077282

An object of the present invention is to solve the problems of the prior art as described above, and when welding a plurality of welding emboss made of metal and a metal plate-shaped ring, resistance welding is performed so that the welding portion is not damaged by the exposed welding embossing. .

The present invention includes a plate-shaped bus bar having a plurality of metal welding embossed thereon, an FPCB at least partially stacked on the bus bar, and a metal welding ring provided at an edge of a through hole formed in a part of the FPCB, A step portion is formed in a portion of the welding embossing, and the step portion is exposed through the through hole and is lower than the height of the portion covered by the welding ring or formed at the same height as the upper surface of the bus bar.

The plurality of welding embossments are disposed at an equal angle with respect to the center point of the exposed area of the bus bar exposed by the through hole.

The exposed area of the bus bar is a virtual circular shape connecting the edges of the stepped portions formed in the plurality of welding emboss to correspond to the through-holes.

The exposed area of the bus bar has a larger diameter than the through hole of the welding ring.

The welding ring has a plate-shaped annular shape.

The present invention is a method of resistance welding a metal bus bar and a metal material and a plate-shaped annular welding having a through hole, the metal welding ring having a through hole on the bus bar having a plurality of welding emboss made of a metal material is formed. The first step of stacking, the second step of aligning only the stepped portion concave so that a part of the welding emboss is stepped is exposed through the through hole, the third step of resistance welding the portion where the welding emboss and the welding ring are in close contact Including, in the second step, the step portion is lower than the height of the portion covered by the welding ring of the welding embossing or the same height as the upper surface of the bus bar.

According to the resistance welding structure and the method according to the present invention, the welding emboss does not come into direct contact with the electrode because the portion exposed through the through hole of the plate-shaped annular welding ring integrally connected with the FPCB is recessed. Since it does not rise, it has the effect of preventing the problem of damage to the FPCB.

In addition, since it is easy to check the position at which the welding ring is seated by the step portion formed in the plurality of welding emboss, the operation of aligning the welding ring on the welding emboss becomes easy, and as a result, the workability is improved.

1 is an external perspective view of a welding emboss formed on a bus bar according to the prior art.
2 is a side cross-sectional view showing a state in which a bus bar and a welding ring according to the prior art are resistance-welded.
3 is an external perspective view of a welding emboss formed on a bus bar constituting an embodiment of the present invention.
Figure 4 is a partial perspective view showing a part of the welding ring constituting the embodiment of the present invention.
5 is an external perspective view of a relay seated on a cover constituting an embodiment of the present invention.
6 is a side cross-sectional view showing a state in which a bus bar and a welding ring constituting an embodiment of the present invention are resistance-welded.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, in describing the embodiment of the present invention, if it is determined that a detailed description of a related known configuration or function interferes with the understanding of the embodiment of the present invention, the detailed description thereof will be omitted.

In addition, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, or order of the elements are not limited by the terms. When it is described that a component is “connected”, “coupled” or “connected” to another component, the component may be directly connected or connected to the other component, but between each component another component It will be understood that may also be "connected", "coupled" or "connected".

Hereinafter, the structure of the present invention will be described with reference to the illustrated drawings.

The bus bar 10 is partially or entirely composed of a plate-shaped flat area to secure enough space for resistance welding. The bus bar 10 is made of a metal, which is a conductive material. It is preferably formed of copper or aluminum having good conductivity, but the present invention is not limited thereto, and any metal capable of resistance welding may be used.

The FPCB (Flexible Printed Circuit Board) 20 is a flexible flexible circuit board and is mechanically and electrically connected to the bus bar 10 to transmit an electrical signal. The FPCB 20 needs a fastening part and a conducting part in order to be mechanically and electrically connected to the bus bar 10 . Accordingly, through holes 22 are formed in various places of the FPCB 20 .

When the welding ring 21 is seated on the bus bar 10 , the through hole 22 determines whether the welding ring 21 is well seated at a position where the bus bar 10 can be welded. It allows you to visually check it.

A welding ring 21 is formed on the periphery of the through hole 22 . The welding ring 21 is formed in a metal ring shape in a predetermined area from the periphery of the through hole 22 .

The welding ring 21 is an object to be resistance welded to the bus bar 10 , and is seated on the upper surface of the bus bar 10 and welded.

A plurality of welding emboss 30 protrudes from the upper surface of the bus bar 10 . The welding emboss 30 informs the location where the bus bar 10 is to be welded to the welding ring 21 in advance, and is in close contact with the bus bar 10 to facilitate welding between the bus bar 10 and the welding ring 21 to be welded. serves to make In the embodiment of the present invention, the plurality of welding emboss 30 protrudes in a hemispherical shape. However, it is not limited to a hemispherical shape, and the shape and number of the welding emboss 30 may be variously changed according to the working environment or the convenience of welding.

The plurality of welding emboss 30 protrude at regular intervals. Specifically, the plurality of welding emboss 30 is densely formed so that resistance welding can be easily performed. In the embodiment of the present invention, as shown in FIG. 3 , a plurality of welding emboss 30 densely clustered in a certain rule are formed at an equal angle so that the center of each welding emboss 30 draws an equilateral triangle, to be precise, an exposure zone to be described later. It is formed at an isometric angle with respect to the center point of (A).

As described above, the plurality of welding emboss 30 protrudes in a hemispherical shape. However, the recessed step portion 32 is formed so that the height of a portion of each of the plurality of welding emboss 30 is lowered. In detail, when the welding ring 21 is seated on the welding emboss 30 of the bus bar 10, the height of a portion of the plurality of welding emboss 30 exposed through the through-hole 22 is It is forced to be lowered. That is, in the step portion 32 , a portion of the welding emboss 30 located in the exposed area A of the bus bar 10 exposed through the through hole 22 is recessed in a stepped manner.

The exposed area A is an area exposed through the through hole 22 among the upper surfaces of the bus bar 10 . The exposed area A includes an area in which the step portion 32 is formed even if it is an area not exposed through the through hole 22 . That is, even when the electrode P comes into contact with the welding ring 21 during resistance welding of the bus bar 10 and the welding ring 21 seated on the bus bar 10 , the through hole 22 ) refers to a region in which the plurality of welding emboss 30 exposed through the step portion 32 do not contact the electrode P.

For example, when the plurality of welding emboss 30 is formed at an equal angle, the step portion 32 formed in the welding emboss 30 is exposed by the through hole 22 so that the through hole ( 22), the exposed area (A) is connected to the virtual extension line connecting the edges of the step portion (32) formed in the plurality of welding emboss (30) to make one figure shape. . In this embodiment, it is shown that the exposed area (A) has a circular shape to correspond to the shape of the through hole (22).

In this case, since the welding ring 21 is not always accurately seated on the plurality of welding emboss 30 , the exposed region A preferably has a larger diameter than the diameter of the through hole 22 .

Through this structure, even when the electrode (P) for resistance welding is in contact with the upper surface of the welding ring (21), the welding emboss 30 comes into contact with the electrode (P) and sticks to the electrode (P) When taking off, the welding ring 21 is prevented from occurring with the electrode (P) being lifted up together.

This is because the step portion 32 is recessed into the welding emboss 30 exposed through the through hole 22 , so even if the electrode P contacts the welding ring 21 , the electrode P and This is because the welding emboss 30 does not contact and stick.

The step portion 32 located in the exposed area A may have a height lower than a portion of the welding emboss 30 located outside the exposed area A, but in the exposed area A, the welding The emboss 30 may be formed so as not to protrude. That is, the step portion 32 may be formed to have the same height as the upper surface of the bus bar 10 .

Hereinafter, resistance welding of the welding emboss 30 and the welding ring 21 of the metal bus bar 10 using the resistance welding structure and the method according to the present invention will be described.

In the present invention, resistance welding is performed between the bus bar 10 used as the bus bar and the welding ring 21 that is connected to the FPCB 20 and serves as an energizing part. At this time, at least two or more welding emboss 30 protrude from the bus bar 10 .

First, the welding ring 21 is placed on the upper surface of the bus bar 10 . In detail, the welding 20 is stacked on the plurality of welding emboss 30 protruding from the upper surface of the bus bar 10 . Although the bus bar 10 and the welding ring 21 may not be completely in close contact, the welding ring 21 is in close contact with the welding emboss 30 at the position where the welding emboss 30 is formed.

Next, the welding ring 21 is aligned so that the welding ring 21 can be well seated on the plurality of welding emboss 30 through the through hole 22 formed in the welding ring 21 . In detail, a step portion 32 is formed in the plurality of welding emboss 30 to be recessed so that the height of each part is lowered, and only the step portion 32 is visible through the through hole 22 . do.

On the other hand, by looking at the step portion 32 formed in the welding emboss 30 , the position where the welding ring 21 is to be seated can be easily determined, and the step portion 32 is exposed through the through hole 22 . As it becomes easy to align as much as possible, workability is improved.

When aligned as described above, when resistance welding is performed, the electrode P does not come into contact with the welding emboss 30 . Therefore, when the electrode P is removed after the welding between the bus bar 10 and the welding ring 21 is finished, the welding ring 21 is attached to the electrode P and is attached to the FPCB 20 connected thereto. to prevent tearing.

In the above, even though all components constituting the embodiment according to the present invention have been described as being combined or operated in combination as one, the present invention is not necessarily limited to this embodiment. That is, within the scope of the object of the present invention, all the components may operate by selectively combining one or more. In addition, terms such as "include", "compose" or "have" described above mean that the corresponding component may be inherent unless otherwise stated, so excluding other components Rather, it should be construed as being able to include other components further. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs, unless otherwise defined. Terms commonly used, such as those defined in the dictionary, should be interpreted as being consistent with the contextual meaning of the related art, and are not interpreted in an ideal or excessively formal meaning unless explicitly defined in the present invention.

The above description is merely illustrative of the technical spirit of the present invention, and various modifications and variations will be possible without departing from the essential characteristics of the present invention by those skilled in the art to which the present invention pertains. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

P : Electrode A : Exposed area
1: bus bar 2: energizing part
3: welding protrusion 10: bus bar
20: FPCB 21: welding ring
22: through hole 30: welding emboss
32: step part

Claims (10)

A plate-shaped bus bar having a plurality of metal welding embossed thereon;
an FPCB, at least a portion of which is stacked on the bus bar;
and a metal welding ring provided at the edge of the through hole formed in a part of the FPCB,
A step portion is formed in a portion of the welding emboss,
A circuit assembly for a vehicle battery to which the step portion is exposed through the through hole and is formed to be lower than the height of the portion covered by the welding ring or the same height as the upper surface of the bus bar. The circuit assembly of claim 1, wherein the plurality of welding embossments are disposed at an equal angle with respect to a center point of an exposed area of the bus bar exposed by the through hole. The circuit assembly for a vehicle battery to which resistance welding is applied according to claim 2, wherein the exposed region of the bus bar has an imaginary circular shape connecting the edges of the stepped portions formed in the plurality of welding emboss to correspond to the through-holes. 4. The circuit assembly of claim 3, wherein the exposed region of the bus bar has a larger diameter than the through hole of the welding ring. [Claim 5] The circuit assembly for a vehicle battery to which resistance welding is applied according to any one of claims 1 to 4, wherein the welding ring has a plate-shaped annular shape. In the method of resistance welding a metal bus bar and a plate-shaped ring-shaped welding of a metal material and a through hole formed therein,
A first step of stacking a metal welding ring having a through hole formed on the bus bar having a plurality of metal welding emboss formed thereon;
a second step of aligning only the stepped portion recessed so that a portion of the welding emboss is exposed through the through hole;
A third step in which the welding emboss and the welding ring are closely adhered to each other are resistance-welded;
In the second step, the step portion is lower than the height of the portion covered by the welding ring of the welding embossing or is the same height as the upper surface of the bus bar. . The method of claim 6, wherein the plurality of welding embossments are disposed at an equal angle with respect to a center point of an exposed area of the bus bar exposed by the through hole. . [8] The method of claim 7, wherein the exposed area has a virtual circular shape connecting the edges of the step portions formed in the plurality of welding emboss to correspond to the through-holes. The method of claim 8, wherein the exposed region of the bus bar has a larger diameter than the through hole of the welding ring. [10] The method according to any one of claims 6 to 9, wherein the welding ring has a plate-shaped annular shape.

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