KR20220021723A - Battery pack terminal connection device and connection method - Google Patents

Abstract

According to the present invention, disclosed are a terminal connecting device for a battery pack and a connecting method thereof. In the present invention, an arrangement state can be inspected through a vision inspection when the battery pack is placed at a welding point, and an operation for checking whether a welding rod is defective or a dressing operation can be performed. Accordingly, the spot welding operation of an automated process for connecting a terminal connection unit and electrode terminals of cylindrical battery cells can be precisely performed without errors, and the quality satisfaction of the battery pack can be improved.

Description

Battery pack terminal connection device and connection method {Battery pack terminal connection device and connection method}

The present invention relates to a battery pack, and more particularly, to a battery pack terminal that enables precise connection without error when electrode terminals of cylindrical battery cells (lithium ion batteries) constituting the battery pack are connected with a terminal connection bar. It relates to a connection device and a connection method thereof.

In general, a lithium ion battery, which is a cylindrical battery cell, is characterized by high capacity and high output, which is arranged in a plurality of cases in one case to constitute one battery pack, and this battery pack is a product that mainly requires a lot of power. and used in the field. For example, it may be applied to an electric vehicle (EV) or a hybrid vehicle (HEV) driven by an electric driving source as well as a portable device.

The battery pack constitutes one module by arranging cylindrical battery cells in a predetermined number in a case and electrically connecting them with each other by a metal plate, and the metal plate is welded to electrode terminals of the cylindrical battery cells by spot welding. that can be connected

However, when spot welding a metal plate to the electrode terminal of the cylindrical battery cells constituting the battery pack through an automated process, the spot welding position setting operation is not constant, and since there is no prior inspection process for the welding rod, the metal plate and The welding between the electrode terminals was often poor.

Registered Patent Publication No. 10-1810659 (published on Dec. 20, 2017) Laid-open Patent Publication No. 10-2018-0129115 (published on Dec. 5, 2018) Laid-open Patent Publication No. 10-2018-0133142 (published on December 13, 2018) Registered Patent Publication No. 10-1962858 (published on March 27, 2019) Registered Patent Publication No. 10-1965373 (published on April 3, 2019) Laid-open Patent Publication No. 10-2020-0025719 (published on March 10, 2020)

The problem to be solved by the present invention is, when the battery pack is placed at the welding point, the arrangement state is inspected through a vision inspection, and then the electrode of the terminal connection part and the cylindrical battery cells is configured so that the welding electrode is defective or the dressing operation is made. An object of the present invention is to provide a terminal connection device and a connection method for a battery pack that allow spot welding of an automated process for terminal connection to be performed precisely without error.

A terminal connecting device for a battery pack, which is a means for solving the problems of the present invention, includes: a main body; a vision inspection unit operable to inspect a seating position of a terminal connection bar with respect to electrode terminals of at least one cylindrical battery cell accommodated in the battery pack when the battery pack is disposed at the welding point in the main body; a welding rod inspection unit driven to inspect whether the welding rod is defective when the seating position of the terminal connection bar with respect to the electrode terminal is within a normal range by the vision inspection unit; a welding unit driving the electrode terminal and the terminal connecting bar to be welded using the welding rod when the welding rod is determined to be normal by the welding rod inspection unit; and a control unit configured to receive inspection information of the vision inspection unit and the welding rod inspection unit, and control driving of the vision inspection unit, the welding rod inspection unit, and the welding unit; will include

In addition, the main body portion, the first rail portion for guiding a linear movement in the X-axis direction with respect to the vision inspection unit; a second rail part for guiding linear movement in the Y-axis direction with respect to the welding part; and a third rail part that linearly moves in the Y-axis direction along the second rail part when the first driving part is driven; will be formed

In addition, the battery pack is mounted on a base, and a fourth rail part for guiding linear movement in the X-axis direction with respect to the base is formed on the body part.

In addition, a stop frame for stopping the transfer of the base is formed on the fourth rail part when the base is disposed at the welding point, and after detecting the stationary state of the base on one surface of the stop frame, it is output to the control unit A stop detector is formed.

In addition, the vision inspection unit may include: a first transfer body that linearly moves along the first rail in an X-axis direction to an upper end of the battery pack by a second driving unit when the battery pack is disposed at a welding point; a lighting unit fixed to the first transfer body, which is turned on or off by the control unit; and a vision camera disposed on the top of the welding point in the main body and provided to the control unit after photographing a seating position of the terminal connection bar with respect to the electrode terminal when the lighting unit is turned on; Including, the control unit is to be loaded with a program for analyzing whether the seating position of the terminal connection bar with respect to the electrode terminal is normal or abnormal through the image information captured by the vision camera.

In addition, the welding rod inspection unit, to be disposed on the side of the welding point of the body portion, the fixed body having an inlet through which the tip side of the welding rod is put; and an inspection machine that is formed at the lower end of the inlet in the fixture and provides the inspection result to the control unit after inspecting whether or not there is a defect on the tip side of the welding rod that is put into and contacted through the inlet; will include

In addition, the welding rod inspection unit, when the inspection of the tip side of the welding rod by the inspection machine is defective, a dressing processor for guiding abrasive processing for removing the defective elements for the tip side of the welding rod; will include more

In addition, the dressing processor is a polishing pad that enables polishing of the tip side of the welding rod.

In addition, the dressing processor is to be elastically supported by the elastic portion coupled to the support rod.

In addition, the welding unit may include a second transfer body that linearly moves in the X-axis direction along the third rail unit when the third driving unit is driven; And, as coupled to the second transfer body, elevating and lowering is performed according to the driving of the fourth driving unit to weld the terminal connecting bar to the electrode terminal, and a pair of welding opposites in which the pair of welding rods are respectively fixed to the tip side. spot welding machine with gun; Including, wherein the pair of welding guns are selectively raised and lowered by alternately in accordance with the selective driving of the fifth driving unit and the sixth driving unit during abrasive processing for dressing or inspection for defects on the tip side of the welding rod by the welding rod inspection unit this will be done

In addition, in the polishing of the tip side of the welding rod, the third rail part linearly moves in the Y-axis direction along the second rail part, and at the same time, the second transfer body in the third rail part is linear in the X-axis direction. During movement, the tip side of the welding rod is made while moving after contacting the dressing processor.

Another problem solving means of the present invention is a method for connecting terminals of a battery pack, comprising the steps of: (a) inserting the battery pack into a welding point; (b) inspecting whether the seating positions of the terminal connection parts with respect to the electrode terminals of the cylindrical battery cells in the battery pack put into the welding point from the step (a) are within the normal range; (c) As a result of the inspection in step (b), if the seating position of the terminal connection part for the electrode terminals is abnormal, a warning sound is output. examining; (d) if the tip side of the welding rod is defective as a result of the inspection in step (c), dressing the tip side to secure a desired normal tip side contact surface in the spot welding operation; and, (e) as a result of the inspection in step (c), the tip side of the welding rod is inspected as a desired normal contact surface in the spot welding operation, or a normal tip side contact surface desired in the spot welding operation is secured through the dressing process of the step (d) after moving the spot welding machine to a welding point, welding a terminal connection portion to the electrode terminal through the welding rod, and electrically connecting the electrode terminals to each other through the terminal connection portion; will include

As described above, the present invention is configured such that, when the battery pack is placed at the welding point, the disposition state is inspected through a vision inspection, and then whether the welding electrode is defective or a dressing operation is performed, through which the terminal connection part and the electrode terminals of the cylindrical battery cells It is possible to expect the effect of improving the quality satisfaction of the battery pack while allowing the spot welding operation of the automated process for connection to be performed precisely without errors.

Effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a schematic side view showing the structure of a battery pack terminal connection device according to an embodiment of the present invention;
2 is a schematic plan view showing the structure of a battery pack terminal connection device according to an embodiment of the present invention.
3 is an enlarged perspective view showing an initial state before moving the lighting unit according to an embodiment of the present invention.
4 is an enlarged perspective view of a state in which a vision camera takes a picture of a battery pack after the lighting unit moves to a welding point according to an embodiment of the present invention;
5 is a schematic plan view showing a state in which a spot welding machine moves to a position of a welding electrode inspection unit according to an embodiment of the present invention;
6 and 7 are schematic side views showing a state of sequentially inspecting whether or not defects on the tip side of a pair of welding rods in the welding electrode inspection unit according to an embodiment of the present invention.
8 is an enlarged perspective view showing a state in which the tip side of the welding rod is polished through a dressing processor according to an embodiment of the present invention.
9 is an enlarged view showing a state in which a spot welding machine welds a terminal connection portion of a metal plate to an electrode terminal using a welding rod according to an embodiment of the present invention;
FIG. 10 is a screen view showing a state in which a battery pack subjected to a vision inspection through a vision inspection unit is displayed on a display unit according to an embodiment of the present invention;
11 is a schematic block diagram of driving units of a battery pack terminal connection device according to an embodiment of the present invention;
12 is a flowchart illustrating a method of connecting a battery pack terminal according to an embodiment of the present invention.

Advantages and features of the present invention, and methods for achieving them, will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, in the embodiments of the technical idea of the present invention, it is not limited to the embodiments disclosed below, but may be implemented in various different forms, only this embodiment makes the disclosure of the present invention complete, and the technology to which the present invention belongs It is provided to fully inform those of ordinary skill in the art the scope of the invention, and is only defined by the scope of the claims in the embodiments of the technical idea of the present invention.

The terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase.

In the present specification, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It is to be understood that it does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Further, the embodiments described herein will be described with reference to cross-sectional and/or plan views, which are ideal illustrative views of the present invention. Accordingly, the embodiments of the present invention are not limited to the specific form shown, but also include necessary changes. For example, the region shown as a right angle may be rounded or have a predetermined curvature. Accordingly, the regions illustrated in the drawings have a schematic nature, and the shapes of the illustrated regions in the drawings are intended to illustrate specific shapes of regions of the device and not to limit the scope of the invention.

Like reference numerals refer to like elements throughout. Accordingly, the same or similar reference signs may be described with reference to other drawings, even if not mentioned or described in the drawings. In addition, although reference signs are not indicated, description may be made with reference to other drawings.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

Referring to the accompanying drawings, the terminal connection device of the battery pack according to an embodiment of the present invention connects the electrode terminals of at least one or more cylindrical battery cells accommodated in the battery pack 100 as shown in FIGS. 3 and 9 . When electrically connected to each other through the terminal connection bar, the electrode terminals and the terminal connection bars are spot-welded through an automated process, and the body portion 10, vision inspection unit 20, welding rod inspection unit 30, and welding unit 40 ), which may include a control unit 50 .

The main body 10 may be formed of a housing-type structure or a frame-coupled structure, and as shown in FIGS. 1 and 2 , a first for guiding a linear movement in the X-axis direction with respect to the vision inspection unit 10 . The first rail part 11, the second rail part 12 for guiding the linear movement in the Y-axis direction with respect to the welding part 40, and the second rail part 12 when the first driving part M1 is driven ) to include a third rail part 13 that moves linearly in the Y-axis direction.

Here, the first driving unit M1 is a cylinder type driving unit using pneumatic or hydraulic pressure according to a control signal of the control unit 50 or a motor type driving unit including a gear unit as shown in the attached FIG. 11 . there will be

At this time, the welding point in the body part 10 may include a fixed base or a movable base 200 on which the battery pack 100 is mounted, and in the case of the base 200 , the main body part ( 10) is to enable linear movement in the X-axis direction along the fourth rail portion (not shown) formed in the step 10).

Here, although not shown in the drawings, a stop frame serving as a stopper for stopping the transfer of the base 200 when the base 200 is disposed at a welding point in the body portion 10 is formed on the fourth rail portion. Also, a stop detector 14 that detects the stop state of the base and outputs it to the control unit 50 may be formed on one surface of the still frame.

That is, the stop detector 14 detects the contact state of the base 200 when the base 200 is stopped in contact with the stop frame, which may be a limit switch, but is not necessarily limited to this. It is not, and after detecting the contact state of the base 200, all types of connection sensors capable of outputting an electrical signal according to the detection to the control unit 50 may be used.

On the other hand, the linear movement in the X-axis direction described above may be a linear reciprocating movement in the left-right direction, and the linear movement in the Y-axis direction may be a linear reciprocating movement in a front-back direction orthogonal to the X-axis direction.

The vision inspection unit 20 is a cylindrical battery cell accommodated in the battery pack 100 when the battery pack 100 is disposed at a welding point in the main body 10, as shown in FIGS. 3 and 4 attached. To be able to inspect the seating position of the terminal connection bar for their electrode terminals, which includes the first transfer body 21 , the lighting unit 22 , and the vision camera 23 .

The first transfer body 21 linearly reciprocates in the X-axis direction along the first rail unit 11 according to the driving of the second driving unit M2 controlled by the control unit 50, which is the When the battery pack 100 is disposed at a welding point in the body portion 10 , the lighting unit 22 can be moved.

Here, the second driving unit M2 is a motor that drives forward or reverse rotation according to a control signal of the control unit 50, and rotates according to the forward rotation or reverse rotation of the motor, as shown in FIG. 11 . It may include a driving gear and a driven gear, and a chain to which the first transfer body 21 is coupled and fixed, which is connected to the actuator and the driven gear while forming a closed loop, but is not necessarily limited thereto. Any driving method capable of linearly reciprocating the first transfer body 21 in the X-axis direction along the first rail part 11 is applicable, and for example, a screw-type rotating body may be applied. .

The lighting unit 22 may be turned on or off by the control unit 50 while being fixed to the first transfer body 21 .

That is, the lighting unit 22 provides illumination so that the battery pack 100 is photographed by the vision inspection unit 23 , and for this purpose, the lighting unit 22 is fixed to the first transfer body 21 . At least one lamp (not shown) is arranged in a rectangular frame 22a having an opening, and a plate-shaped transparent plate 22b is coupled to the opening of the rectangular frame 22a. As the light is diffused to the transparent plate 22b, the transparent plate 22b can provide illumination that can cover the entire plane of the battery pack 100.

The vision camera 23 is disposed and fixed at the top of the welding point in the main body 10, and when the lighting unit 22 is turned on, the position of the terminal connection bar with respect to the electrode terminal is photographed, and then it is It is to be provided to the control unit 50 .

At this time, as shown in the attached FIG. 10 , the image information captured by the vision camera 23 is displayed on the display unit 301 of the control panel 300 including the control unit 50 , while the operator operates the display unit ( 301), it is also possible to visually check the seating state of the terminal connection bar with respect to the electrode terminal in the battery pack 100 through the image information displayed.

Here, the control unit 50 may be equipped with a program for analyzing whether the seating position of the terminal connection bar with respect to the electrode terminal is normal or abnormal through the image information captured by the vision camera 23, Although not shown in the drawing, when the abnormal analysis is performed by the program of It may be possible to make it removable.

The welding rod inspection unit 30 is controlled by the control unit 50 when the seating position of the terminal connection bar with respect to the electrode terminal by the vision inspection unit 20 is within a normal range, as shown in FIGS. 3 to 7 . It is driven to inspect whether there is a defect on the welding rods (T1, T1') according to the signal, which includes the fixture 31 and the inspector 32, but may further include a dressing processor 33 in addition to this. .

The fixture 31 is fixedly arranged on the side of the welding point of the main body 10, and has an inlet 31a into which the tip side of the welding rods T1 and T1' coupled to the welding portion 40 is put. will be.

The inspector 32 is formed at the lower end of the inlet 31a in the fixture 31, which is inputted into the inlet 31a and is in contact with the tip side of the welding rods T1 and T1'. After checking whether or not it is, it is outputted to the control unit 50 .

That is, the welding rod (T1, T1') is a material containing copper (eg, dispersion-reinforced copper alloy) component, and during repeated welding operations, the tip side is worn by pressure and heat, and the end is melted to allow wear. As it progresses beyond the limit value and the resistance value changes, welding defects may occur on the object to be welded.

Accordingly, the inspector 32 is capable of measuring whether there is a defect on the tip side of the welding rods T1 and T1 ′ that are put into the inlet 31a of the fixture 31 , which is the welding rods T1 and T1 . '), it is inspected for defects by touching the part of the instrument when bending occurs.

When the dressing processor 33 inspects the tip side of the welding rods T1 and T1' by the inspection machine 32 as being defective, polishing to eliminate the defective elements on the tip side of the welding rods T1 and T1' It guides the processing.

That is, the dressing processor 33 is a polishing pad that enables polishing for the tip side of the welding rods T1 and T1 ′, as shown in the attached FIG. 8 , and the control unit 50 includes the inspection device 32 . ), when the result of the inspection that the tip side of the welding rods T1 and T1' is defective, the welding portion 40 is controlled to move the welding portion 40 to the dressing processor 33, and the welding portion The tip side of the welding rod (T1, T1') coupled to (40) is moved after contacting the dressing processor 33, to secure the desired contact surface while grinding the tip side of the welding electrode (T1, T1'). to make it possible

At this time, as shown in the accompanying FIG. 5 , in the abrasive processing for the tip side of the welding rods T1 and T1 ′, the third rail portion 13 moves linearly in the Y-axis direction along the second rail portion 12 . At the same time, when the second transfer body 41 linearly moves in the X-axis direction in the third rail part 13, the tip side of the welding rods T1 and T1' coupled to the welding part 40 is the It can be made while moving after contacting the dressing processor (33).

Here, while the dressing processor 33 is elastically supported by the elastic portion 35 coupled to the support rod 34 , the elastic portion 35 is polished to the tip side of the welding rods T1 and T1 ′. It absorbs the pressure generated when it is made, and accordingly, the polishing process for the welding electrodes T1 and T1' can be stably performed.

The welding part 40 is the electrode terminal (T1, T1') using the welding electrode (T1, T1') when the welding electrode (T1, T1') by the welding electrode inspection part 30 is in a normal state, as shown in the attached FIG. It drives to weld 101a) and the terminal connecting bar, and includes a conventional spot welder 42 transferred by the second transfer body 41 .

The second transfer body 41 moves linearly in the X-axis direction along the third rail 13 when the third driving unit M3 is driven, and the spot welding machine 42 is configured to operate the second transfer body ( 41) while being raised and lowered according to the driving of the fourth driving unit M4, the terminal connecting bar is welded to the electrode terminal, and the pair of welding rods T1 and T1' are fixed to the front end of the opposite facing each other. A pair of welding guns (42a, 42a') that can be formed.

At this time, the pair of the welding guns 42a and 42a' facing each other is the fifth driving unit M5 or the second driving unit M5 or the first when inspecting whether the welding rod inspection unit 30 is defective or polishing the welding rods T1 and T1'. 6 According to the driving of the driving unit (M5), it is possible to selectively alternately elevate and descend.

Here, the fifth and sixth driving units M5 and M6 are hydraulic or pneumatic cylinders, and in the compartment plate in the hydraulic or pneumatic cylinder, the connection of the welding guns 42a and 42a' included in the welding unit 40 is As each is connected, the welding guns (42a, 42a') can be raised and lowered by interlocking with the compartment plate, which is raised and lowered according to the hydraulic pressure or pneumatic pressure supplied to the upper or lower portions of the hydraulic or pneumatic cylinder.

11 , the control unit 50 receives inspection information of the vision inspection unit 20 and the welding rod inspection unit 30 , and the vision inspection unit 20 and the welding rod inspection unit 30 and the welding unit In addition to the driving control at ( 40 ), driving of the first to sixth driving units M1 , M2 , M3 , M4 , M5 , and M6 may be controlled.

As described above, in the terminal connection method made by the terminal connection device of the battery pack according to the embodiment of the present invention, as shown in the accompanying FIGS. 1 to 12 , first as a step (a), the battery pack 100 is mounted on the base 200 is placed, the base 200 is transferred to the welding point in the body part 10 through the fourth rail part 14 .

Then, the base 200 comes into contact with the stop frame disposed at the welding point in the main body 10 to stop the transport as well as the stop state is detected through the stop sensor 14 and then transmitted to the control unit 50 do.

Thereafter, the control unit 50 drives the first driving unit M1 so that the first transfer body 21 included in the vision inspection unit 20 is disposed along the first rail unit 11 above the welding point. .

As the next step (b), the control unit 50 controls lighting of the lighting unit 22 coupled and fixed to the first transfer body 21 , and at the same time, the vision camera 23 included in the vision inspection unit 20 . ), the vision camera 23 uses the lighting provided by the lighting unit 22 to photograph the arrangement state of the terminal connection bar with respect to the electrode terminals of the battery cells in the battery pack 100 disposed at the welding point. After that, the photographing information is provided to the control unit 50 .

At this time, the control unit 50 displays the photographing information so that the operator can read it through the display unit, as well as the image information photographed by the vision camera 23 of the terminal connection bar to the electrode terminal. It is to analyze whether the seating position is normal or abnormal.

As the next step (c), if the seating position is abnormal as a result of the analysis as described above, the control unit 50 generates a warning sound, and if it is normal, a defect inspection for the welding electrodes T1 and T1 ' is performed as the next process. will be.

That is, when the seating position of the terminal connection bar with respect to the electrode terminal is within a normal range from the image information captured by the vision camera 23 , the control unit 50 controls the second and third rail units 12 and 13 . ) to move the spot welding machine 42 to the fixture 31 included in the welding rod inspection unit 30, and then to the welding guns 42a and 42a' of the spot welding machine 42 respectively. T1 and T1 ′ are sequentially introduced into the inlet 31a of the fixture 31 .

At this time, the inspection machine 32 included in the welding rod inspection unit 30 inspects whether the tip side of the welding rods T1 and T1 ′ sequentially introduced into the inlet 31a is defective or normal due to the bending. The inspection result is provided to the control unit 50, and as the next step (d), when all the tip sides of the welding electrodes T1 and T1' are defective or only one is defective, the control unit 50 is After transferring the spot welding machine 42 to the dressing processor 33, while the welding guns 42a, 42a' are sequentially lowered, the welding rods T1 and / or The tip side of T1') is polished to secure a desired normal contact surface in the spot welding operation.

As the next step (e), the control unit 50 moves the welding guns 42a and 42a' of the spot welding machine 42 to the welding point in the main body 10 and then lowers the control operation at the same time. As the welding is performed, the welding rods T1 and T1' respectively coupled to the welding guns 42a and 42a' are welded to the terminal connection part that maintains a seated state within the normal range on the electrode terminal of the cylindrical battery cell, The electrode terminals of the cylindrical battery cells can be electrically connected to each other through the terminal connection bars.

In the above, the technical idea of the terminal connection device and the connection method of the battery pack of the present invention has been described along with the accompanying drawings, but this is an exemplary description of the best embodiment of the present invention, and does not limit the present invention.

Therefore, the present invention is not limited to the specific preferred embodiments described above, and various modifications can be made by anyone skilled in the art without departing from the gist of the present invention as claimed in the claims. It is, of course, possible that such modifications are intended to be within the scope of the appended claims.

10; body 11; first rail
12; a second rail unit 13; 3rd rail
14; stop detector 20; vision inspection department
21; a first transfer body 22; lighting department
23; vision camera 30; Welding Rod Inspection Department
31; fixture 31a; inlet
32; checker 33; dressing processor
40; weld 41; second transfer body
42; spot welders 42a, 42a'; welding gun
50; control unit 100; battery pack
200; bases M1, M2, M3, M4, M5; drive part
T1, T1'; Welding

Claims (11)

body part;
a vision inspection unit driven to inspect a seating position of a terminal connection bar with respect to electrode terminals of at least one cylindrical battery cell accommodated in the battery pack when the battery pack is disposed at the welding point in the main body;
a welding rod inspection unit driven to inspect whether the welding rod is defective when a seating position of the terminal connection bar with respect to the electrode terminal is within a normal range by the vision inspection unit;
a welding unit for driving the electrode terminal and the terminal connecting bar to be welded using the welding rod when the welding rod is determined to be normal by the welding rod inspection unit; and,
a control unit receiving inspection information of the vision inspection unit and the welding rod inspection unit, and controlling driving of the vision inspection unit, the welding rod inspection unit, and the welding unit; Terminal connection device of the battery pack, characterized in that it comprises a. The method of claim 1,
The main body includes a first rail for guiding a linear movement in the X-axis direction with respect to the vision inspection unit; a second rail part for guiding linear movement in the Y-axis direction with respect to the welding part; and a third rail part that linearly moves in the Y-axis direction along the second rail part when the first driving part is driven; Terminal connection device of the battery pack, characterized in that formed. 3. The method of claim 2,
The battery pack is mounted on a base, and a fourth rail portion for guiding linear movement in the X-axis direction with respect to the base is formed on the main body portion,
A stop frame for stopping the transfer of the base when the base is disposed at the welding point is formed on the fourth rail,
Terminal connection device of the battery pack, characterized in that forming a stop detector for detecting the stop state of the base on one surface of the stop frame and outputting it to the control unit. 3. The method of claim 2,
The vision inspection unit,
a first transfer body that linearly moves in the X-axis direction along the first rail to an upper end of the battery pack by a second driving unit when the battery pack is disposed at the welding point;
a lighting unit fixed to the first transfer body, which is turned on or off by the control unit; and,
a vision camera disposed at the top of the welding point in the main body and provided to the control unit after photographing a seating position of the terminal connection bar with respect to the electrode terminal when the lighting unit is turned on; including,
The control unit is equipped with a program for analyzing whether the seating position of the terminal connecting bar with respect to the electrode terminal is normal or abnormal through the image information captured by the vision camera. 3. The method of claim 2,
The welding rod inspection unit,
It is disposed on the side of the welding point of the body portion, the fixed body having an inlet through which the tip side of the welding rod is put; and,
an inspection machine formed at the lower end of the inlet in the fixture and provided with the test result to the control unit after inspecting whether or not there is a defect on the tip side of the welding rod that is put into and in contact with the inlet; Terminal connection device of the battery pack, characterized in that it comprises a. 6. The method of claim 5,
In the welding rod inspection unit,
a dressing processor for guiding abrasive processing to remove defective elements for the tip side of the welding rod when the tip side of the welding rod is inspected as defective by the inspection machine; Terminal connection device of the battery pack, characterized in that it further comprises. 7. The method of claim 6,
The dressing processor is a terminal connection device for a battery pack, characterized in that the polishing pad that enables abrasive processing on the tip side of the welding rod. 8. The method of claim 7,
The dressing processor is a battery pack terminal connection device, characterized in that elastically supported by an elastic portion coupled to the support rod. 3. The method of claim 2,
The welding part,
a second transfer body that linearly moves along the third rail in the X-axis direction when the third driving unit is driven; And, as coupled to the second transfer body, elevating and lowering is performed according to the driving of the fourth driving unit to weld the terminal connecting bar to the electrode terminal, and a pair of opposite welding rods are respectively fixed to the distal end. spot welding machine with gun; including,
The pair of welding guns are selectively raised and lowered by alternately in accordance with the selective driving of the fifth driving unit and the sixth driving unit during abrasive processing for dressing or inspection for defects on the tip side of the welding rod by the welding rod inspection unit. terminal connection device of the battery pack. 9. The method of claim 8,
In the abrasive processing for the tip side of the welding rod, the third rail part linearly moves in the Y-axis direction along the second rail part, and at the same time, when the second transfer body moves linearly in the X-axis direction in the third rail part, Terminal connection device of the battery pack, characterized in that the front end side of the welding rod is made while moving after contacting the dressing processor. (a) inserting the battery pack into a welding point;
(b) inspecting whether the seating positions of the terminal connection parts with respect to the electrode terminals of the cylindrical battery cells in the battery pack put into the welding point from the step (a) are within the normal range;
(c) As a result of the inspection in step (b), if the seating position of the terminal connection part for the electrode terminals is abnormal, a warning sound is output. examining;
(d) if the tip side of the welding rod is defective as a result of the inspection in step (c), dressing the tip side to secure a desired normal tip side contact surface in the spot welding operation; and,
(e) As a result of the inspection in step (c), the tip side of the welding rod is inspected as a desired normal contact surface in the spot welding operation, or when the desired normal tip contact surface is secured in the spot welding operation through the dressing process in step (d), after moving the spot welding machine to a welding point, welding a terminal connection portion to an electrode terminal through the welding rod, and electrically connecting the electrode terminals to each other through the terminal connection portion; Terminal connection method of the battery pack, characterized in that it comprises a.

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