KR102023301B1 - Method for manufacturing bus bar of battery - Google Patents

Abstract

The present invention relates to a method for manufacturing a bus bar for a battery, capable of manufacturing a bus bar for a battery by processing a supplied strip through a progressive mold. The method for manufacturing a bus bar for a battery comprises: a strip supplying step of continuously and gradually supplying the strip to the progressive mold; a bus bar bridge processing step of allowing the strip to gradually pass a plurality of processing molds forming the progressive mold and to be processed by the bus bar of a bar shape to allow a connecting hole to be penetrated into both ends and forming a bridge for connecting a gap between the bus bar and an adjacent bus bar; a bridge cutting step of punching and cutting the bridge from the bus bar through a bridge punching mold which is the last mold among the plurality of processing molds forming the progressive mold; and a bus bar taking out step of taking out the bus bar of which the bridge is cut from the progressive mold. The bridge cutting step includes a first punching step of forming a punching groove of a first punching core by pressing and punching a connecting unit of the bridge connected to the bus bar by using the first punching core which is operated from a lower part to an upper part and a second punching step of cutting the bridge connecting unit from the bus bar by pressing and punching the connecting unit of the bridge in which the punching groove is formed by using a second punching core which is operated from a lower part to an upper part. The present invention can reduce production costs.

Description

Manufacturing method of bus bar for battery {METHOD FOR MANUFACTURING BUS BAR OF BATTERY}

The present invention relates to a method for manufacturing a battery busbar, and more particularly, to a process of manufacturing a battery busbar by processing a continuous and stepped strip through a progressive mold of the bridge connecting the strip and the busbar The present invention relates to a method of manufacturing a bus bar for a battery, which can prevent generation of burrs generated during cutting and minimize a defect occurrence rate when coating is formed on the surface of the bus bar.

Recently, as the demand for portable electronic products such as laptops, video cameras, mobile phones, etc. is rapidly increasing, and development of electric vehicles, energy storage batteries, robots, satellites, etc. is in earnest, high-performance secondary batteries capable of repeated charging and discharging are possible. There is an active research on.

Commercially available secondary batteries include nickel cadmium batteries, nickel hydride batteries, nickel zinc batteries, and lithium secondary batteries. Among them, lithium secondary batteries have almost no memory effect compared to nickel-based secondary batteries, and thus are free of charge and discharge. The self-discharge rate is very low and the energy density has been spotlighted.

Such lithium secondary batteries mainly use lithium-based oxides and carbon materials as positive electrode active materials and negative electrode active materials, respectively. The lithium secondary battery includes an electrode assembly in which a positive electrode plate and a negative electrode plate coated with the positive electrode active material and the negative electrode active material are disposed with a separator interposed therebetween, and a packaging material that seals the electrode assembly together with the electrolyte solution, that is, a battery case.

In general, a lithium secondary battery may be classified into a can type secondary battery in which an electrode assembly is embedded in a metal can and a pouch type secondary battery in which an electrode assembly is embedded in a pouch of an aluminum laminate sheet, depending on the shape of the exterior material.

Recently, secondary batteries have been widely used not only for small devices such as portable electronic devices, but also for medium and large devices such as automobiles and power storage devices. In particular, as carbon energy is gradually depleted and interest in the environment is increasing, attention has been focused on hybrid and electric vehicles worldwide, including the United States, Europe, Japan, and Korea. One of the most important parts of such an electric vehicle is a battery pack that provides driving power to a vehicle motor.

Such battery packs usually include a plurality of secondary cells, which are connected in series and in parallel with each other to improve capacity and output. Such a battery pack generally includes a cell assembly having a plurality of secondary batteries stacked in a stacked form, and a pack housing for storing the cell assembly in an inner space. In addition, in order to use such a battery pack, the battery pack and an external device must be electrically connected through a connector such as a connecting wire or a bus bar, and a connection terminal is provided in the battery pack for such a connection.

In connection with the connector for electrical connection, when a large amount of current flows, it is difficult to cope with wire-type wire, so a bar-shaped conductor made of copper is used. This is called a bus bar, which can be understood as a conductor with low impedance and high current capacity.

Such busbars are used not only for battery packs of electric vehicles, but also for power boxes in buildings that use high power, and busbars are also used for relay devices, junction boxes for vehicles, battery controllers, etc., even in vehicles using large capacity batteries.

The connecting terminals to which the above-described busbars are coupled are mainly formed with a screw thread on the outer circumferential surface of the terminal, and fastening holes formed at both ends of the busbars are fastened to the connecting terminals. Fix it. At this time, the connection terminal is also referred to as a terminal bolt because the thread is formed on the outer peripheral surface having a bolt shape.

That is, when a bus bar having fastening holes formed at both ends is used as a connector for electrical connection, the connection terminal has to be in the form of a terminal bolt, and in connection with the connection and coupling structure between the bus bar and the terminal bolt, The battery pack has an improved torque support structure for the terminal bolt. Referring to FIG. 1 as an example, it can be seen through the structure in which the bus bar 12 is fastened to the terminal bolt 11. Reference numeral 10 denotes a center plate 10 of the battery pack, which is located above the cell assembly in the inner space of the pack housing, and is directly connected to an external device such as a motor or a charger through a terminal bolt 11 or a busbar 12. It is configured to connect via).

As shown in FIG. 1, the shapes of the bus bars 12 are various, and as illustrated in FIG. 2, the bus bars 12 having various shapes are photographed and photographed. However, as shown in FIG. 2, when applied as an actual product, an insulating coating 12b is applied to the surface of the bus bar 12 except for the fastening holes 12a formed at both ends.

Here, as a method of manufacturing the bus bar 12, a continuous and stepped strip for mass production is processed through a progressive mold to produce a battery bus bar 12. That is, the process in which the strip S is processed into the bus bar 12 while passing through the progressive mold can be seen through a state in which the strip S is taken out as shown in FIG. 3. The bridge (B) is connected to the end of the strip (S) in the form of the final bus bar 12, the bridge punching mold is located at the last mold end of the progressive mold, the bus bar on the strip (S) By punching out and cutting the bridge B connecting 12, only the shape of the final busbar 12 is taken out, as shown in FIG.

Here, in the process in which the strip S is processed into the bus bar 12 while passing through the progressive mold, each corner of the bus bar 12 has a rounded shape R at each step by the shape of the plurality of processing molds. To have. However, as shown in FIG. 4, when the cut surface of the bus bar 12 connected to the bridge B is viewed, it may be confirmed that burrs are formed. That is, since the bridge B is cut after the bus bar 12 passes through the progressive mold and is processed to a final shape, burrs may be formed on the cut surface of the bus bar 12 connected to the bridge B. It is not there.

This is the case of the bridge punching die 20 of the progressive mold used in the manufacturing method of the battery bus bar according to the prior art as shown in Figs. 5 and 6 the bus bar 12 by only punching down the punching core 21. This is because the bridge B connected with) is cut. Therefore, the base material is pushed on the cutting surface of the bus bar 12 connected to the bridge B, so that a burr may be formed as shown in FIG. 4.

The burr formed on the cut surface of the bus bar 12 is coated with an insulating coating 12b on the surface of the bus bar 12 during delivery of the final bus bar 12, as shown in FIG. 12b) is not properly combined and breaks or tears. Therefore, in order to prevent this, a problem arises in that the worker individually grinds the burr formed on the cut surface of the bus bar 12 that has been progressively processed and taken out again. On the other hand, there is a case in which a separate calibration mold made to match the shape of the bus bar 12 is provided, and the pressing operation is performed to round the corners including the cut surface of the bus bar 12.

In the case of using a manual grinding operation or using a separate calibration mold, there is a problem that not only the complexity of the process but also a sudden decrease in productivity and an increase in production cost.

An object of the present invention devised to solve the above problems, when cutting the bridge connecting the strip and the bus bar in the process of manufacturing a battery bus bar by processing the strip continuously fed in a progressive step through a mold. It is to provide a method of manufacturing a battery bus bar that can prevent the occurrence of burrs (burr) generated to minimize the failure rate when forming a coating on the surface of the bus bar.

In order to achieve the above object, a method for manufacturing a battery busbar according to the present invention is a method for manufacturing a battery busbar for manufacturing a battery busbar by processing a continuous and stepped strip through a progressive mold. And a strip supplying step of continuously and stepwise supplying the strip to the progressive mold, and through the plurality of processing molds constituting the progressive mold, passing through the plurality of processing molds to form fastening holes at both ends thereof. From the bus bar through the bus bar bridge processing step of processing to form a bridge connecting the bus bar and the adjacent bus bar at the same time and a bridge punching mold, which is the last mold among the plurality of processing molds forming the progressive mold By punching the bridge The step includes a bridge cutting step and a bus bar taking-out step of taking out the bus bar from which the bridge is cut from a progressive mold, wherein the bridge cutting step operates downwardly upwards toward a connection portion of the bridge connected to the bus bar. A first punching step of forming a punching groove in the shape of the first punching core by pressure punching with a first punching core, and a second punching core operating upwards and downwards toward the connection portion of the bridge in which the punching groove is recessed. And a second punching step of cutting the connection part of the bridge from the bus bar by pressure punching.

In addition, the first punching core, the first punching head and the first punching head which is installed in the lower mold of the bridge punching mold and pressurized punching the connecting portion of the bridge from below to the upper, and punched and inserted into the connecting portion of the bridge It is formed as a first punching body extending extending stepped to the lower portion of the, characterized in that the round is formed on the step surface between the first punching head and the first punching body.

In addition, the first punching core, the height of the side of the first punching head is characterized in that the height is formed between 70 to 80% of the thickness of the bridge connecting portion.

In addition, the connection portion of the bridge is punched by the first punching core is characterized in that the protrusion receiving groove is formed in the upper mold of the bridge punching mold so as to correspond to the first punching core so as to accommodate the protrusion projecting upwardly. .

In addition, an area of the lower surface of the protrusion accommodating groove may be smaller than an area of the upper surface of the first punching head of the first punching core.

In addition, the first punching core is tapered at a predetermined angle on the side of the first punching head with respect to the cutting surfaces facing each other between the connection portion of the bus bar and the bridge, characterized in that formed in the shape of the upper and lower light. .

In addition, the second punching core, the second punching head and the second punching head which is installed in the upper mold of the bridge punching mold and pressurized punching the connecting portion of the bridge from above to the lower side, and punched through the connecting portion of the bridge It is formed as a second punching body extending extending stepped to the top of the, characterized in that the round is formed on the step surface between the second punching head and the second punching body.

In addition, the second punching core is characterized in that the height of the second punching head is formed larger than the thickness of the bridge connecting portion.

In the method for manufacturing a battery busbar according to the present invention, a bridge cutting step is sequentially performed to a first punching step and a second punching step in the process of manufacturing a battery busbar by processing a continuous and stepped strip through a progressive mold. By preventing the occurrence of burrs (burrs) generated during the cutting of the bridge connecting the strip and the bus bar has an effect that can minimize the failure rate when forming the coating on the surface of the bus bar.

Accordingly, there is no need to perform the grinding work by a separate manual work or the calibration work by the calibration mold, so that the productivity can be greatly improved and the production cost can be drastically reduced.

In particular, the shape of the first punching core for performing the first punching step and the shape of the second punching core for performing the second punching step, and the bridge punching mold for performing the bridge cutting step, the first punching core and the second Designed to fit the shape of the punching core to smooth the cut surface when cutting the bridge from the bus bar to facilitate the formation of the coating, there is an effect to take out the connection portion of the cut bridge more easily by punching.

1 is a perspective view showing a state in which a bus bar is installed in a typical battery pack,
FIG. 2 is a perspective view of a bus bar taken by various shapes in the embodiment of FIG. 1;
FIG. 3 is a perspective view illustrating a state in which a strip is taken out during a process of processing a 'c' shaped bus bar through a progressive mold in FIG. 2;
FIG. 4 is a perspective view illustrating a taken out state of a bus bar in which a bridge is cut from a progressive mold according to the related art in the embodiment of FIG. 3,
5 and 6 are side cross-sectional views illustrating a process in which a bridge is cut by a punching core of a bridge punching mold in a progressive mold in a method of manufacturing a battery bus bar according to the prior art;
7 is a flowchart illustrating an embodiment of a method of manufacturing a battery bus bar according to the present invention;
FIG. 8 is a plan view illustrating a process of cutting and taking out busbars and bridges after the processes of the embodiment of FIG. 7 are formed based on strips supplied to a progressive mold,
9 is a side cross-sectional view showing a progressive mold for performing each process of the embodiment of FIG.
10 to 12 are main side cross-sectional views illustrating a process of performing a first punching step of the embodiment of FIG. 7 by enlarging the first punching core of the bridge punching mold in the embodiment of FIG. 9;
13 to 15 are side cross-sectional views illustrating a process of performing a second punching step of the embodiment of FIG. 7 by enlarging the second punching core of the bridge punching mold in the embodiment of FIG. 9.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of a method for manufacturing a battery bus bar according to the present invention.

In the method for manufacturing a battery bus bar according to the present invention, as shown in FIGS. 7 to 9, the strip S is continuously and stepwise supplied through the progressive mold 200 to process the battery bus bar 100. The present invention relates to a method for manufacturing a battery bus bar, including a strip supplying step (S100), a bus barb processing step (S200), a bridge cutting step (S300), and a bus bar taking out step (S400), and cutting the bridge. Step S300 includes a first punching step S310 and a second punching step S320.

First, the progressive mold 200 is a specific shape by gradually processing the shape of the material in accordance with the processing mold arranged in each step while passing through a plurality of processing molds arranged in each step of the continuously supplied material Refers to the mold for final molding. In this case, the material supplied to the progressive mold 200 generally uses a strip S. The strip S refers to a metal in the form of a wide band or a thin plate (3 mm or less in thickness). In the present invention, since the strip S is a bus bar 100 for electrical connection, the strip S is made of copper.

That is, the strip feeding step S100 supplies the strip S continuously and stepwise to the progressive mold 200 as shown in FIGS. 7 and 8. The continuous and stepwise supply of the strip S means that the progressive mold 200 itself is a continuous and stepwise mold, and that the supply of the strip S forms the progressive mold 200 continuously in step by step. It must be supplied.

In addition, the bus barb processing step (S200) is a fastening hole 110 at both ends as the strip (S) passes step by step along a plurality of processing molds forming the progressive mold 200, as shown in Figure 7 and 8 ) Is processed into a bus bar 100 having a bar shape so as to penetrate through it, and at the same time, the bridge B is connected to the bus bar 100 and an adjacent bus bar 100. The embodiment illustrated in the drawings is merely an example of a 'c' shaped bus bar 100, but is not limited to the shape of the bus bar 100, the bus bar 100 is shown in FIG. It may be a variety of shapes, such as 'b', 'S', 'U', it will be possible to design a plurality of processing molds constituting the progressive mold 200 to fit the shape to be processed.

However, the progressive mold 200 itself is to process the final desired shape by supplying the strip (S) continuously and stepwise, the bridge (B) connecting between the final shape and the final shape so that the final shape can be connected to each other It must be formed essentially. In the case of the present invention, as shown in Figure 7, the final shape is the bus bar 100 of the '' 'shape, when the bus bar 100 is processed on the strip (S) and the bus bar 100 The busbars 100 are connected to each other through a bridge (B).

Bridge cutting step (S300) is the bridge from the bus bar (100) through the bridge punching die 210, which is the last mold of the plurality of processing molds forming the progressive mold 200, as shown in Figure 7 to 9 Punch and cut B). That is, the bus bar bridge processing step (S200) through the strip (S) is finally processed in a state having the shape of the bus bar 100 of the final shape, the bus bar 100 and the bus bar 100 between Brit (B) to connect is to cut by punching through the bridge punching mold (210). The bus bar 100 in which the bridge B is cut is taken out through the bus bar taking out step S400 described later.

That is, in the bus bar taking out step S400, the bus bar B from which the bridge B is cut is taken out from the progressive mold 200 to the outside. In the case of the bridge punching mold 210 in the progressive mold 200, the bus bar 100 is automatically taken out downward when the bridge B is cut from the bus bar 100, which is a final product, or the bridge. It also has a structure that is automatically taken out through the pusher in the lateral direction of the punching mold (210).

The bus bar 100, which is the final product, is manufactured from the progressive mold 200 through the above-described strip supply step S100, bus bar bridge processing step S200, bridge cutting step S300 and bus bar take-out step S400. . Here, if the bridge cutting step (S300) is performed incorrectly, a burr is generated on the cutting surface of the bus bar 100. It is a feature of the present invention to solve such a burr, which can be achieved through the first punching step S310 and the second punching step S320 described later in the bridge cutting step S300.

The first punching step (S310) is a first punching core 213 operating downward from upward toward the connection part B1 of the bridge B connected to the bus bar 100, as shown in FIGS. 9 to 12. Pressure punching to form a recess in the punching groove B1a in the shape of the first punching core 213.

In addition, the second punching step (S320) is a second operation from above to downward toward the connecting portion (B1) of the bridge (B) in which the punching groove (B1a) is recessed, as shown in Figure 9 and 13 to 15 The punching core 214 is punched out to cut the connection portion B1 of the bridge B from the bus bar 100.

That is, the first punching step (S310) does not cut the connecting portion B1 of the bridge B, which is the cut portion between the bus bar 100 and the bridge B, with the first punching core 213 at once, and punches the recessed portion. The groove B1a is formed. Through this, the portion where the punching groove B1a is formed is in a state where the base material is pushed up by the height of the recess of the punching groove B1a. Next, in the second punching step S320, the connection portion B1 of the bridge B is punched through the second punching core 214 in the opposite direction punched by the first punching core 213 to completely cut it. Accordingly, since the cutting height of the connection portion B1 of the bridge B becomes the depression height of the punching groove B1a rather than the top or bottom thereof, as shown in FIG. Burr) will not occur.

At this time, the first punching core 213 is installed in the lower mold 211 of the bridge punching mold 210 as shown in Figure 9 to 12 to connect the connecting portion (B1) of the bridge (B) from below to upward. The first punching body 213b which is pressurized and extended stepwise to the lower portion of the first punching head 213a and the first punching head 213a which are punched and inserted into the connection portion B1 of the bridge B. And a round is formed on the stepped surface 213c between the first punching head 213a and the first punching body 213b. Accordingly, the burr is not generated at the lower end of the cut surface of the bus bar 100, as well as the corners are not formed at right angles, and rounds are formed, thereby significantly lowering the failure rate during coating formation.

Here, the first punching core 213 is such that the side height of the first punching head 213a is formed to a height of 70 to 80% of the thickness of the bridge (B) connecting portion (B1). For example, when the connection portion B1 of the bridge B has a thickness of 3 mm, the side height of the first punching head 213a is formed to be between 2.1 and 2.4 mm. The reason why the lateral height of the first punching head 213a is 70% or more of the thickness of the connection part B1 is that the burr is generated while the height is formed to form a round on the step surface of the first punching core 213. This is because the height can be minimized. On the other hand, the reason why the lateral height of the first punching head 213a is 80% or less of the thickness of the connecting portion B1 is that the connecting portion B1 may be cut off by mistake when the lateral height is formed.

When the punching groove B1a is formed in the lower portion of the connection portion B1 of the bridge B by the first punching core 213, the upper portion of the connection portion B1 may protrude upward. At this time, the protrusion part receiving groove 212a is formed in the first punching core 213 so that the connection part B1 of the bridge B is punched by the first punching core 213 to receive the protrusion B1b protruding upward. Recession is formed in the upper mold 212 of the bridge punching mold 210 to correspond to. The protrusion accommodating groove 212a is, first, to be formed so as to conform to the shape of the protrusion accommodating groove 212a without being deformed in another direction while the protrusion B1b of the connection portion B1 is accommodated in the protrusion accommodating groove 212a. In order to prevent the connection part B1 from being cut when pressure punched upward by the first punching core 213.

In order to more specifically, the area of the lower surface of the protrusion accommodating groove 212a is smaller than the area of the upper surface of the first punching head 213a of the first punching core 213. That is, when the area of the protrusion accommodating groove 212a is equal to or larger than the area of the upper surface of the first punching head 213a, the connecting portion B1 that is accidentally pushed upward by the first punching core 213 may be cut. Because it can.

In this way, the connection portion B1 pressurized upward by the first punching core 213 is cut while being pressurized downward by the second punching core 214, wherein the connection portion is formed by the second punching core 214. What is necessary is just to make the shape of the said punching groove B1a into the shape of upper and lower light so that (B1) may be easily taken out below. To this end, the first punching core 213 has a predetermined angle to the side of the first punching head 213a with respect to the cutting surfaces facing each other between the connection portion B1 of the bus bar 100 and the bridge B. The furnace taper 213d is formed and formed in the shape of upper and lower light beams. Accordingly, the shape of the punching groove B1a is also the same as the shape of the first punching head 213a, and then the connection portion B1 is pushed downward by the second punching core 214 to be more easily taken out during movement. It can be.

Meanwhile, the second punching core 214 is installed on the upper die 212 of the bridge punching die 210 as shown in FIGS. 9 and 13 to 15 to upwardly connect the connection portion B1 of the bridge B to the upper portion. A second punching body which is formed by stepping downwardly on the upper portion of the second punching head 214a and the second punching head 214a which are punched downward and punched through the connection portion B1 of the bridge B; 214b, a round is formed on a stepped surface between the second punching head 214a and the second punching body 214b.

Here, unlike the first punching core 213 to form the punching groove B1a, the second punching core 214 cuts the connection portion B1 of the bridge B completely, and at the same time as the punching connection portion B1 The second punching head 214a is configured to penetrate through the thickness of. That is, the second punching core 214 is formed such that the height of the second punching head 214a is greater than the thickness of the bridge B connecting portion B1.

In addition, the second punching core 214 is also rounded on the stepped surface between the second punching head 214a and the second punching body 214b of the second punching core 214 like the first punching core 213. Since the burrs are not generated at the upper end of the cut surface of the bus bar 100, as well as the corners are not formed at right angles, the rounds are formed, and thus, the occurrence rate of defects during coating formation can be further reduced.

As described above, in the method for manufacturing a battery bus bar according to the present invention, a bridge in a process of manufacturing a battery bus bar 100 by processing a strip S, which is supplied continuously and stepwise, through the progressive mold 200. Burr generated when cutting the bridge (B) connecting the strip (S) and the bus bar 100 by sequentially performing the cutting step (S300) to the first punching step (S310) and the second punching step (S320) ( By preventing the occurrence of burr has the effect of minimizing the failure rate when forming a coating on the surface of the bus bar (100).

Accordingly, there is no need to perform the grinding work by a separate manual work or the calibration work by the calibration mold, so that the productivity can be greatly improved and the production cost can be drastically reduced.

In particular, the shape of the first punching core 213 performing the first punching step (S310) and the shape of the second punching core 214 performing the second punching step (S320) are specified, and the bridge cutting step (S300). The bridge punching mold 210 for performing the step) is designed according to the shape of the first punching core 213 and the second punching core 214 to soften the cutting surface when cutting the bridge B from the bus bar 100. The coating can be made more easily, and the connection portion B1 of the cut bridge B can be easily taken out by punching.

The embodiments of the present invention described above and illustrated in the drawings should not be construed as limiting the technical idea of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications will fall within the protection scope of the present invention, as will be apparent to those skilled in the art.

S: strip
B: Bridge B1: Connection
B1a: Punching groove B1b: Protrusion
R: round
100: bus bar 110: fastener
200: progressive mold
210: bridge punching mold 211: lower mold
212: upper mold 212a: protrusion receiving groove
213: first punching core 213a: first punching head
213b: first punching body 213c: stepped surface of the first punching core
213d: taper
214: second punching core 214a: second punching head
214b: second punching body 214c: stepped surface of second punching core
S100: Strip Supply Step
S200: Bus bar bridge processing step
S300: Bridge Cutting Step
S310: first punching step S320: second punching step
S400: bus bar ejection stage

Claims (8)

In the method of manufacturing a battery busbar for manufacturing a battery busbar by processing the continuous and stepwise strips through a progressive mold,
A strip supplying step of continuously and stepwise supplying the strip to the progressive mold, and a bar-shaped bus so that fastening holes are formed at both ends while the strip passes step by step along a plurality of processing molds forming the progressive mold. The bus bar bridge processing step of forming a bridge connecting between the bus bar and the adjacent bus bar at the same time processing, and the bridge bar from the bus bar through the bridge punching mold which is the last mold of the plurality of processing molds forming the progressive mold A bridge cutting step of punching and cutting a bridge, and a bus bar taking-out step of taking out the bus bar from which the bridge is cut, from a progressive mold,
The bridge cutting step,
A first punching step of forming a punching groove in the shape of the first punching core by pressing the first punching core to be operated upward from the bottom toward the connection portion of the bridge connected to the bus bar; and forming the recessed punching groove. And a second punching step of cutting the connection part of the bridge from the busbar by punching with a second punching core operating upwardly and downwardly toward the connection part of the bridge,
The first punching core,
A stepped in a lower portion of the first punching head, the first punching head installed in a lower mold of the bridge punching mold and contacting a lower surface of the bridge and a first punching head to press-punch the connecting portion of the bridge upwards to recess the punching groove; A first punching body extending and extending from the fork, and a round is formed on a step surface between the first punching head and the first punching body so that the lower end of the punching groove is rounded.
The first punching core,
The height of the side of the first punching head is formed to a height between 70 and 80% of the thickness of the bridge connecting portion, and is defined on the side of the first punching head with respect to the cutting surfaces facing each other between the connecting portion of the bus bar and the bridge. The taper is formed at the angle of to form the shape of the upper and lower light,
When the connecting portion of the bridge is punched by the first punching core is formed in the upper portion of the bridge punching die so that the projection receiving groove is formed so as to correspond to the first punching core so as to accommodate the projection protruding upwards, The area of the manufacturing method of the battery bus bar, characterized in that less than the area of the upper surface of the first punching head of the first punching core.
delete delete delete delete delete The method of claim 1,
The second punching core,
It is installed on the upper portion of the bridge punching mold and pressurized punching the connecting portion of the bridge from above, and the second punching head which is punched and penetrated through the connecting portion of the bridge and extended stepped on the upper portion of the second punching head A method of manufacturing a bus bar for a battery, which is formed of a second punching body, and a round is formed on a stepped surface between the second punching head and the second punching body.
The method of claim 7, wherein
The second punching core,
And a height of the second punching head is greater than a thickness of the bridge connecting portion.

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