KR102448314B1 - Laser cleaning apparatus of battery module including cylindrical battery cells - Google Patents

Abstract

A battery module laser cleaning apparatus for removing foreign substances present on a surface of a cylindrical battery cell and a battery module including the same includes: a laser generator oscillating a laser beam; a controller for controlling the laser generator; and a laser cleaning head for receiving the laser beam oscillated by the laser generator through an optical fiber and irradiating the corresponding surface of the battery module, wherein the laser cleaning head includes a head housing and a position in the head housing and a laser beam collimator for collimating the laser beam dispersed from the end of the optical fiber into parallel light, and a high-speed galvano scanner for high-speed scanning the laser beam transmitted through the laser beam collimator with a mirror mounted on a scan motor; and a focusing lens for irradiating the laser beam scanned by the high-speed galvano scanner at a focal length to the corresponding surface of the battery module.

Description

Laser cleaning apparatus of battery module including cylindrical battery cells

The present invention relates to a laser cleaning apparatus for effectively removing foreign substances present on a bonding surface to which a wire is to be bonded before a wire bonding operation for manufacturing a battery module including cylindrical battery cells.

Recently, the demand for batteries is rapidly increasing due to the market expansion of household appliances and industrial products using batteries as power sources. In particular, as batteries are applied to transportation means such as bicycles, motorcycles, and automobiles, the demand for large-capacity batteries is increasing. A large-capacity battery is assembled into a module unit by collecting cells in units of cells, and then the modules are combined to form a pack and mounted. In the cell unit, batteries are divided into cylindrical, prismatic, and pouch types according to their shape. Recently, as the demand for electric vehicles has skyrocketed, cylindrical batteries are widely used as large-capacity batteries for automobiles.

1 shows a schematic diagram of a cylindrical battery cell 20 , a battery module 2 including cylindrical battery cells 20 , and a battery pack 1 .

As shown in FIG. 1 , a plurality of cuboidal battery modules 2 including a plurality of cylindrical battery cells 20 therein are gathered to constitute a battery pack 1 . In addition, the cylindrical battery cell 20 has a (+) electrode portion formed in a circular shape in the center, that is, a positive electrode portion 21, and a (-) electrode portion formed over both the outer side of the battery, the case and the lower surface, that is, the negative electrode portion. (22). A high-capacity battery module 2 is provided for realization of a high-voltage and high-current high-capacity battery, and the high-capacity battery module 2 arranges a plurality of cylindrical battery cells 20 at regular intervals, and electrodes of the cylindrical battery cells 20 . It can be made by connecting the electrodes in series or in parallel.

In general, in order to connect battery cells, an electrode terminal block is installed in a battery module, and resistance welding or laser welding is generally performed for bonding between the electrode part of the battery cell and the electrode terminal block. Recently, the electrode of a cylindrical battery cell A bonding method by wire bonding is used for connection between the negative electrode and the electrode terminal block.

2 is a schematic diagram illustrating a battery module after the wire bonding operation is finished.

2, an electrode terminal block 2A is installed in the battery module for inter-electrode connection of the cylindrical battery cells 20, and a wire 2B formed of a material having good electrical conductivity such as copper, aluminum, etc. Wire bonding for connecting between the electrode part 21 or 22 of the cylindrical battery cell 20 and the electrode terminal block 2A is performed by using it. Compared to the conventional resistance and laser welding methods, the wire bonding method has the advantage of maintaining stable and uniform bonding characteristics over the entire battery area in that it is an individual point bonding method.

Batteries have a risk of explosion and fire if an instantaneous surge occurs due to overload, impact, or changes in the physical environment during use. In particular, in the case of a large-capacity battery, this risk is very large, and many safety devices are provided to prevent surges. When a surge occurs, a high voltage current flows along the electrode part and the electrode junction part. However, as shown in FIG. 2 , when the bonding connection between the electrode parts is made by wire bonding, when a surge occurs, the wire 2B acts as a fuse and is cut off. Even if one wire (2B) is broken, the parallel design is well done and the battery capacity is not greatly affected. As a result, the connection between electrodes by the wire bonding method is increasingly used due to the safety advantage that it can solve the surge problem, which is the biggest risk factor of the battery.

However. The wire bonding method has a disadvantage in that the bonding strength is relatively small and sensitive compared to resistance welding and laser welding in which metal and metal are melted and joined. In particular, when contaminants such as oxides, corrosives, electrolytes, oil, etc. exist on the surface of the electrode part or electrode terminal block to which the wire is bonded, that is, the bonding surface, the bonding strength of the wire is greatly reduced and the problem of showing non-uniform bonding strength is a problem. have.

Republic of Korea Patent Registration No. 10-1135499 (Registration Date April 4, 2012)

The present invention has been devised to solve the problems of the prior art, and in the manufacturing process of a battery module including cylindrical battery cells, a foreign material in a region to be bonded with a wire for inter-electrode connection of cylindrical battery cells is very quickly and effectively with a laser beam. To provide a removable, battery module laser cleaning device.

The above objects and various advantages of the present invention will become more apparent from preferred embodiments of the invention described below with reference to the accompanying drawings by those skilled in the art.

According to one aspect of the present invention, each including a central (+) electrode part 21 and an outer (-) electrode part 22, arranged in a two-dimensional array including a plurality of rows and a plurality of columns A plurality of cylindrical battery cells 20 and each of a plurality of electrode terminal blocks ( 2A), wherein the plurality of electrode terminal blocks 2A are connected to the (+) electrode parts 21 or the (-) electrode parts 22 of the cylindrical battery cells 20 by wire bonding. For the fabrication of the module 2, before connecting the (+) electrode parts 21 and the (-) electrode parts 22 to the electrode terminal blocks 2A by wire bonding, the (+) electrode Two-dimensional laser cleaning of the bonding target areas on the parts 21, the bonding target areas on the (-) electrode parts 22, and the bonding target areas on the electrode terminal block 2A to remove foreign substances, There is provided a laser cleaning apparatus for a battery module (2) including cylindrical battery cells (20), the laser cleaning apparatus comprising: a transfer unit (700) for putting the battery module (2) before a wire bonding operation into a cleaning operation position; a sensing unit for detecting that the battery module 2 is put into the cleaning work position; A laser generator 130 for generating a laser beam, a power supply unit 110 for supplying power to the laser generator 130, and a controller 120 for controlling the laser generator 130 are integrated, and the wheel The main body 100 is installed; It is disposed on the upper side of the battery module 2 put into the cleaning operation position, and receives the laser beam generated by the laser generator 130 through an optical fiber 300 to receive the ( The laser beam is irradiated in a two-dimensional pattern to the areas to be bonded on the +) electrode portions 21, the areas to be bonded on the (-) electrode portions 22, and the areas to be bonded on the electrode terminal block 2A. a laser cleaning head 200 for laser cleaning; and a dust collecting port 410 installed near an area in which bonding target areas of the battery module 2 are cleaned, a dust collecting hose 420 having one end connected to the dust collecting port 410, and the dust collecting hose 420 and a dust collector 430 to which the other end is connected, and the laser cleaning head 200 is composed of a first part and a second part formed to intersect the first part and having a lower end facing the battery module 2 The head housing 210, the laser beam collimator 220 located in the first part of the head housing 210, and collimating the laser beam dispersed from the end of the optical fiber 300 into parallel light, and the head housing A high-speed galvano scanner 230 located on the upper side in the second part of 210 and high-speed scanning the laser beam transmitted through the laser beam collimator 220 with a mirror mounted on a scan motor, and the head housing ( Located on the lower side in the second part of 210 and focusing the laser beam scanned by the high-speed galvano scanner 230 at a focal length to irradiate the corresponding surface of the battery module 2, a focal point consisting of an f-theta lens The lens 240 and the protective window 250 mounted on the lower end of the second part in the section after the focus lens 240 to protect the focus lens 240 and the optical components before the focus lens, and the center It is coupled to the upper end of the second part so that the axis is coaxial with the central axis of the high-speed galvano scanner 230, so that the bonding target areas of the cylindrical battery cells and the bonding target areas of the terminal blocks can be visually identified. It includes a camera, and so that the laser cleaning head 200 can irradiate the laser beam in a two-dimensional pattern to the bonding target areas of the cylindrical battery cells 20 and the electrode terminal blocks 2A without moving, the high-speed The galvano scanner 230 uses a 2D scanning method using two motors and two mirrors, and in order to quickly clean the entire surface of the battery module 2 including the cylindrical battery cells 20, high speed The scan field width w by the galvano scanner 230 is 200 mm or more, and the laser beam includes cylindrical battery cells 20 characterized in that it is a fiber laser in the form of a pulse wave.
According to another aspect of the present invention, each including a central (+) electrode part 21 and an outer (-) electrode part 22, arranged in a two-dimensional array including a plurality of rows and a plurality of columns A plurality of cylindrical battery cells 20 and each of a plurality of electrode terminal blocks ( 2A), wherein the plurality of electrode terminal blocks 2A are connected by wire bonding between (+) electrode parts 21 or (-) electrode parts 22 of the cylindrical battery cells 20 ( 2), before connecting the (+) electrode parts 21 and the (-) electrode parts 22 to the electrode terminal blocks 2A by wire bonding, the (+) electrode part ( A cylindrical battery that removes foreign substances by two-dimensionally laser cleaning the bonding target areas on the 21), the bonding target areas on the (-) electrode parts 22, and the bonding target areas on the electrode terminal block 2A A laser cleaning method of a battery module (2) including cells (20) is provided, wherein the laser cleaning method uses a transfer unit (700) to put the battery module (2) before the wire bonding operation into a cleaning operation position step, detecting that the battery module 2 is put into the cleaning work position by using a sensing unit, generating a laser beam with a laser generator 130, and the battery module put into the cleaning work position The laser cleaning head 200 disposed on the upper side of (2) receives the laser beam generated by the laser generator 130 through an optical fiber 300 and is a bonding target on the (+) electrode parts 21 . Laser cleaning by irradiating a laser beam in a two-dimensional pattern on the regions, the bonding target regions on the negative electrode parts 22, and the bonding target regions on the electrode terminal block 2A; and the battery module ( The dust collection port (4) installed near the area where the bonding target areas of 2) are cleaned 10), a dust collection hose 420 having one end connected to the dust collecting port 410, and a dust collector 430 connected to the other end of the dust collecting hose 420 by sucking and removing dust generated during laser cleaning The laser cleaning head 200 includes a head housing 210 composed of a first part and a second part formed to intersect the first part with a lower end facing the battery module 2; , a laser beam collimator 220 positioned in the first part of the head housing 210 and collimating the laser beam dispersed from the end of the optical fiber 300 into parallel light, and the second part of the head housing 210 . A high-speed galvano scanner 230 located on the upper side of the part and high-speed scanning the laser beam transmitted through the laser beam collimator 220 with a mirror mounted on a scan motor, and the second part of the head housing 210 A focusing lens 240 made of an f-theta lens, which is located on the lower side of the interior and focuses the laser beam scanned by the high-speed galvano scanner 230 at a focal length and irradiates the corresponding surface of the battery module 2; In order to protect the focus lens 240 and the optical components before the focus lens, a protective window 250 mounted on the lower end of the second part in the section after the focus lens 240, and the central axis of the high-speed galvano and a vision camera coupled to the upper end of the second part so as to be coaxial with the central axis of the scanner 230 to visually identify the bonding target areas of the cylindrical battery cells and the bonding target areas of the terminal blocks; The high-speed galvano scanner 230 so that the laser cleaning head 200 can irradiate the laser beam in a two-dimensional pattern to the bonding target areas of the cylindrical battery cells 20 and the electrode terminal blocks 2A without moving. uses a 2D scanning method using two motors and two mirrors, and in order to quickly clean the entire surface of the battery module 2 including the cylindrical battery cells 20, a high-speed galvano scanner 230 ) A scan field width (w) of 200 mm or more, and the laser beam includes cylindrical battery cells (20), characterized in that the fiber laser in the form of a pulse wave.

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The battery module laser cleaning apparatus according to the present invention is applied to a cleaning process before wire bonding of a battery module including cylindrical battery cells, so that the bonding surface requiring wire bonding in the battery module can be laser cleaned precisely and at high speed. Accordingly, it is possible to dramatically improve the adhesion of the wire after the wire bonding operation, which is a subsequent process.

3 is a schematic diagram showing a battery module laser cleaning apparatus according to the present invention,
4 is a view for explaining a cleaning area (bonding surface) in the battery module to be cleaned by the battery module laser cleaning apparatus according to the present invention.

Prior to describing the specific content for carrying out the present invention, it is understood that the terms or words used in the present specification and claims may properly define the concept of the term in order for the inventor to best describe his invention. Based on the principle, it should be interpreted as meaning and concept consistent with the technical idea of the present invention. In addition, it should be noted that, when it is determined that a detailed description of a known function and its configuration related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof is omitted. Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

3 is a schematic diagram illustrating a battery module laser cleaning apparatus according to the present invention, and FIG. 4 is a view for explaining cleaning areas (bonding surfaces) in the battery module to be cleaned by the battery module laser cleaning apparatus according to the present invention.

Referring to FIG. 3, the battery module laser cleaning apparatus according to the present invention is for cleaning a surface (hereinafter, referred to as "bonding surface") to which a wire is to be bonded in a battery module including cylindrical battery cells in advance with a laser beam. , a laser generator 130 that oscillates a laser beam, and a laser cleaning head that receives a laser beam from the laser generator 130 through an optical fiber 300 and irradiates the laser beam on the bonding surface in the battery module ( 200) are included.

In addition, the battery module laser cleaning apparatus includes a power supply unit 110 for supplying power to the laser generator 130 and a controller 120 for controlling the laser generator 130 . The laser generator 130 , the controller 120 , and the power supply unit 110 may be integrated into one main body 100 . In order to be able to easily move the main body 100 in the field, it is preferable that the wheels 102 are installed in the lower part of the main body 100 .

During the cleaning operation, the laser cleaning head 200 is held on any holding means on site or lifted and held by an operator, but when it is necessary to transport the battery module cleaning device as a whole, the laser cleaning head 200 and the The optical fiber 300 may be moved together while being carried on the main body 100 .

Meanwhile, the laser cleaning head 200 includes a head housing 210 , a laser beam collimator 220 built in the head housing 210 , a high-speed Galvano scanner 230 , and a focusing lens. (240). At this time, the head housing 210 is formed to intersect the first part and the first part in which the laser beam collimator 220 is accommodated, and the high-speed galvano scanner 230 and the focus lens 240 are located. It can contain 2 parts.

The laser beam oscillated by the laser generator 130 is transmitted to the laser beam collimator 220 through an optical fiber 300 . The laser beam collimator 220 is connected to the end of the optical fiber 300 and serves to collimate the laser beam dispersed from the end of the Guam fiber 300 into parallel light again.

The laser beam from the laser beam collimator 220 is transmitted to the high-speed galvano scanner 230 . The high-speed galvano scanner 230 is configured to scan the laser beam transmitted through the laser beam collimator 220 left and right at high speed by a mirror mounted on a scan motor therein. Since the high-speed galvano scanner 230 performs 2D scanning using two scan motors and two mirrors, it is possible to quickly clean a large area without moving the laser cleaning head 200 .

The laser beam scanned in 2D through the high-speed galvano scanner 230 passes through the focusing lens 240 and is focused at a specific focal length d. In this case, it is preferable to use an f-theta lens as the focus lens 240 . The f-theta lens has the advantage of uniform cleaning by maintaining a constant focal position in the 2D scanning area.

In order to protect the inner mirror of the focus lens 240 and the high-speed galvano scanner 230, after the focus lens 240, that is, when viewed in the direction in which the laser beam travels, a protection window (protection) in front of the focus lens 240 window) 250 is preferably installed. In this embodiment, the protection window 250 may be installed near the lower end of the second part of the head housing 210 . In this case, it is preferable that the protection window 250 is a consumable item. It is preferable that the operator periodically cleans the surface of the protective window 250, which is a consumable, before the laser cleaning operation.

In addition, the battery module laser cleaning apparatus according to the present invention further includes a dust collecting means 400 to collect and remove fine dust generated in the cleaning area during the laser cleaning operation. The dust generated during the laser cleaning operation is harmful to the human body and contaminates the optical parts around the cleaning area and in the laser cleaning head 200. Since the dust collecting means 400 collects and removes the dust in real time during the laser cleaning operation, such contamination can be prevented. In this embodiment, the dust collecting means 400 includes a dust collecting port 410 disposed near the cleaning area, a dust collecting hose 420 having one end connected to the dust collecting port 410 , and the dust collecting hose 420 . It includes a dust collector 430 to which the other end is connected. The dust generated during the laser cleaning operation is sucked through the dust collecting port 410 and finally collected in the dust collector 430 through the dust collecting hose 420 .

Meanwhile, as the laser generator 130 , it is preferable to use a fiber laser that is easy to install and does not require special optical alignment because generation and transmission of a laser beam are integrated. In addition, for effective laser cleaning, peak power must be high. For this purpose, it is preferable to use a pulsed laser beam having a pulse width of 1 μsec or less and a pulse energy of 0.1 mJ or more. do.

In addition, the diameter of the laser beam collimated through the laser beam collimator 220 is an important factor in determining the spot size of the focused laser beam. If the diameter is large, the spot size becomes small and damage to the base material occurs easily. If the diameter is too small, the spot size becomes large and the cleaning performance is deteriorated. Accordingly, the diameter of the collimated laser beam emitted through the laser beam collimator 220 is preferably between 3 and 10 mm.

In addition, the focal length d of the focal lens 240 mounted on the laser cleaning head 200 is preferably 150 mm or more and 600 mm or less. If the focal length (d) is too short (less than 150 mm), the spot size of the focused laser beam is too small, and the energy density is high, which may cause damage to the base material, and the optical parts may be damaged by dust generated during cleaning. can be easily contaminated. In addition, when the focal length d exceeds 600 mm and is too long, the spot size of the laser beam becomes excessively large, making it difficult to obtain sufficient laser intensity, making it difficult to perform an effective laser cleaning operation.

The maximum cleaning area is determined as an area in which the focus position is constantly maintained by the combination of the high-speed galvano scanner 230 and the focus lens 240 . In order to quickly clean the entire surface of the battery module 2 including cylindrical battery cells, it is preferable that the scan field width w be at least 200 mm.

The battery module 2 requiring a cleaning operation is automatically put into the cleaning area where the laser cleaning head 200 is installed using a transfer unit 700 such as a robot or a conveyor, and the laser cleaning operation is automatically performed after input. it is preferable To this end, it is preferable that a sensing unit for detecting the input is provided. When the detection unit detects that the battery module 2 is put into the correct position, the controller operates the battery module laser cleaning device so that the laser beam is irradiated to the surface that needs cleaning of the battery module 2 , that is, the bonding surface. to control In addition, when the cleaning operation is completed, it is preferable that the cleaned battery module 2 is automatically transferred to the subsequent wire bonding process by the transfer unit 700 .

4 is a view for explaining cleaning areas in the battery module to be cleaned by the battery module laser cleaning apparatus according to the present invention.

Referring to FIG. 4 together, a bonding area BA that requires actual laser cleaning among areas of the battery module 2 is a very small bonding area in which wire bonding is performed, as indicated by a hatch. If this bonding area can be accurately recognized, cleaning can be performed at a very high speed.

3 and 4 together, the battery module laser cleaning device according to the present invention accurately grasps a specific position inside the battery module 2 to accurately clean only a necessary area, the laser cleaning head 200 It further includes a vision camera 500 coupled to one side of the. At this time, if the central axis of the vision camera 500 is positioned to be coaxial with the central axis of the high-speed galvano scanner 230 , the position of the cylindrical battery cell 20 in the entire cleaning area can be confirmed at high speed.

The battery module laser cleaning apparatus according to the present invention can be applied to all sites of manufacturing a battery module equipped with cylindrical battery cells.

Above, it should be recognized that the above description is merely illustrative of some preferred embodiments of the present invention, and those skilled in the art can make modifications and changes to the present invention without changing the gist of the present invention.

110 ..............................Power supply unit
120 .............................. Controller
130 ............... Laser generator
200 ............... Laser cleaning head
220 ...............................Laser Beam Aimer
230 ............... High-speed galvano scanner
240 ............... Focus lens
2.............................Battery module
20..................Cylindrical battery cell

Claims (10)

A plurality of cylindrical battery cells 20 each including a central (+) electrode part 21 and an outer (-) electrode part 22, and arranged in a two-dimensional array including a plurality of rows and a plurality of columns ) and a plurality of electrode terminal blocks 2A, each arranged between rows of neighboring cylindrical battery cells 20 or arranged outside the rows of cylindrical battery cells 20 at the outside, wherein the plurality of For the manufacture of the battery module 2, the electrode terminal blocks 2A are connected to the (+) electrode parts 21 or the (-) electrode parts 22 of the cylindrical battery cells 20 by wire bonding. , before connecting the (+) electrode parts 21 and the (-) electrode parts 22 to the electrode terminal blocks 2A by wire bonding, a bonding target on the (+) electrode parts 21 Cylindrical battery cells 20 for removing foreign substances by two-dimensionally laser-cleaning the regions and the regions to be bonded on the negative electrode parts 22 and the regions to be bonded on the electrode terminal block 2A. It is a laser cleaning device of the battery module (2),
a transfer unit 700 for putting the battery module 2 before the wire bonding operation into a cleaning operation position;
a sensing unit for detecting that the battery module 2 is put into the cleaning work position;
A laser generator 130 for generating a laser beam, a power supply unit 110 for supplying power to the laser generator 130, and a controller 120 for controlling the laser generator 130 are integrated, and the wheel The main body 100 is installed;
It is disposed on the upper side of the battery module 2 put into the cleaning operation position, and receives the laser beam generated by the laser generator 130 through an optical fiber 300 to receive the ( The laser beam is irradiated in a two-dimensional pattern to the areas to be bonded on the +) electrode portions 21, the areas to be bonded on the (-) electrode portions 22, and the areas to be bonded on the electrode terminal block 2A. a laser cleaning head 200 for laser cleaning; and
A dust collecting port 410 installed near an area where the bonding target areas of the battery module 2 are cleaned, a dust collecting hose 420 having one end connected to the dust collecting port 410, and the other end of the dust collecting hose 420 . It includes a dust collector 430 to which it is connected,
The laser cleaning head 200,
A head housing 210 composed of a first part and a second part formed to intersect the first part and having a lower end facing the battery module 2;
A laser beam collimator 220 located in the first part of the head housing 210 and collimating the laser beam dispersed from the end of the optical fiber 300 into parallel light;
A high-speed galvano scanner 230 located on the upper side of the second part of the head housing 210 and high-speed scanning the laser beam transmitted through the laser beam collimator 220 with a mirror mounted on a scan motor;
Located on the lower side of the second part of the head housing 210 and focusing the laser beam scanned by the high-speed galvano scanner 230 at a focal length to irradiate the corresponding surface of the battery module (2), f-theta A focal lens 240 made of a lens, and
A protective window 250 mounted on the lower end of the second part in a section after the focus lens 240 to protect the focus lens 240 and the optical components before the focus lens,
It is coupled to the upper end of the second part so that the central axis is coaxial with the central axis of the high-speed galvano scanner 230, so that the bonding target areas of the cylindrical battery cells and the bonding target areas of the terminal blocks can be visually identified. includes a vision camera;
The high-speed galvano scanner 230 so that the laser cleaning head 200 can irradiate the laser beam in a two-dimensional pattern to the bonding target areas of the cylindrical battery cells 20 and the electrode terminal blocks 2A without moving. ) uses a 2D scanning method using two motors and two mirrors,
In order to quickly clean the entire surface of the battery module 2 including the cylindrical battery cells 20, the scan field width w by the high-speed galvano scanner 230 is 200 mm or more, and the laser beam is A laser cleaning apparatus of a battery module (2) comprising cylindrical battery cells (20), characterized in that it is a spar-type fiber laser. A plurality of cylindrical battery cells 20 each including a central (+) electrode part 21 and an outer (-) electrode part 22, and arranged in a two-dimensional array including a plurality of rows and a plurality of columns ) and a plurality of electrode terminal blocks 2A, each arranged between rows of neighboring cylindrical battery cells 20 or arranged outside the rows of cylindrical battery cells 20 at the outside, wherein the plurality of For the manufacture of the battery module 2 in which the two electrode terminal blocks 2A are connected by wire bonding to the (+) electrode parts 21 or the (-) electrode parts 22 of the cylindrical battery cells 20, wire Before connecting the (+) electrode parts 21 and the (-) electrode parts 22 to the electrode terminal blocks 2A by bonding, bonding areas on the (+) electrode parts 21 are and cylindrical battery cells 20 for removing foreign substances by laser cleaning two-dimensionally laser-cleaning the bonding target areas on the negative electrode parts 22 and the bonding target areas on the electrode terminal block 2A. A laser cleaning method of the module (2),
Putting the battery module (2) before the wire bonding operation into the cleaning operation position using the transfer unit (700);
Detecting that the battery module 2 is put into the cleaning operation position using a detection unit;
generating a laser beam with a laser generator 130;
The laser cleaning head 200 disposed on the upper side of the battery module 2 put into the cleaning operation position receives the laser beam generated by the laser generator 130 through an optical fiber 300 and receives the (+) A laser beam is irradiated in a two-dimensional pattern to the bonding target areas on the electrode parts 21, the bonding target areas on the (-) electrode parts 22, and the bonding target areas on the electrode terminal block 2A. cleaning; and
A dust collecting port 410 installed near an area where the bonding target areas of the battery module 2 are cleaned, a dust collecting hose 420 having one end connected to the dust collecting port 410, and the other end of the dust collecting hose 420 . Using this connected dust collector 430, it includes the step of sucking and removing the dust generated during laser cleaning,
The laser cleaning head 200,
A head housing 210 composed of a first part and a second part formed to intersect the first part and having a lower end facing the battery module 2;
A laser beam collimator 220 located in the first part of the head housing 210 and collimating the laser beam dispersed from the end of the optical fiber 300 into parallel light;
A high-speed galvano scanner 230 located on the upper side of the second part of the head housing 210 and high-speed scanning the laser beam transmitted through the laser beam collimator 220 with a mirror mounted on a scan motor;
Located on the lower side of the second part of the head housing 210 and focusing the laser beam scanned by the high-speed galvano scanner 230 at a focal length to irradiate the corresponding surface of the battery module (2), f-theta A focal lens 240 made of a lens, and
A protective window 250 mounted on the lower end of the second part in a section after the focus lens 240 to protect the focus lens 240 and the optical components before the focus lens,
It is coupled to the upper end of the second part so that the central axis is coaxial with the central axis of the high-speed galvano scanner 230, so that the bonding target areas of the cylindrical battery cells and the bonding target areas of the terminal blocks can be visually identified. includes a vision camera;
The high-speed galvano scanner 230 so that the laser cleaning head 200 can irradiate the laser beam in a two-dimensional pattern to the bonding target areas of the cylindrical battery cells 20 and the electrode terminal blocks 2A without moving. ) uses a 2D scanning method using two motors and two mirrors,
In order to quickly clean the entire surface of the battery module 2 including the cylindrical battery cells 20, the scan field width w by the high-speed galvano scanner 230 is 200 mm or more, and the laser beam is A laser cleaning method of a battery module (2) comprising cylindrical battery cells (20), characterized in that it is a spar-type fiber laser. delete delete delete delete delete delete delete delete

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