KR102252162B1 - Methode and Apparatus of pouch sealing using by laser and glass as light guide panel - Google Patents

Abstract

The present invention relates to a method and a device for sealing a pouch using laser light and a glass light guide plate, which have: a technical configuration having a relatively high light absorptivity of about 15% in the 808 nm wavelength band, although aluminum often used as a metal foil material in a pouch often used as an encapsulation material for a lithium secondary battery has a very low laser light absorption rate; condense a plurality of laser light sources so that a polymer resin for a skin can be transmitted through; directly heat the metal foil; and adhere the glass light guide plate with a pressure element.

Description

Method and Apparatus of pouch sealing using by laser and glass as light guide panel}

The present invention is a technical field in which a pouch, which is a sealing material composed of a polymer resin for an outer skin, a metal foil, and a polymer resin for an inner skin, is bonded.

The present invention is a method and apparatus for thermally fusion by transmitting a laser light in a wavelength band that transmits a polymer resin for an outer skin to a glass light guide plate, directly heating a metal foil located in the middle of a pouch, and using a glass light guide plate as a pressure element. Most of the aluminum, which is often used as a metal foil material for pouches, has a very low laser light absorption rate, but a configuration using a technical characteristic having a relatively high light absorption rate of about 15% in the 808nm wavelength band and condensing a plurality of laser light sources. The present invention relates to a method and apparatus for welding a pouch using a laser light and a glass light guide plate that pressurizes and bonds a glass light guide plate by directly heating a metal foil through a polymer resin for an outer skin.

Pouches composed of various types of polymer resin layers, such as outer and inner skins, centered on metal foils such as thin aluminum, are mainly used in the form of bags, but are particularly widely used as packaging bags for lithium secondary batteries (Fig. 1: Pouch-type lithium secondary A photograph of the battery and Fig. 2: A cross-sectional structure diagram of a pouch for a secondary battery).

In order to form a packaging bag, a process of bonding the pouch is essential, and the most common method is a method of mechanically pressing a heated metal plate from both sides of the two pouch to heat-sealing the pouch (Fig. 3: Description of the thermal bonding method of the pouch). .

The type of metal foil inside the pouch or the polymer resins that make up the outer and inner skins are composed of types with characteristics suitable for each purpose.The polymer resin for inner skin has a lower melting point than the polymer resin for outer skin, and a thermoplastic resin must be used for thermal fusion. This is possible.

Looking at the heat transfer path of the classical thermal fusion process using such a heated metal plate, the heated metal plate at the highest temperature reaches the thermoplastic resin for the inner skin through the multi-layered polymer resin for the skin and the metal foil, which is the thermal melting point of the polymer resin for the inner skin. Heat must be heated above the temperature, and only when a predetermined time required for fusion is maintained to complete thermal fusion (Fig. 4: heat transfer path of the pouch).

At this time, the polymer resin for the skin should have as little heat deformation as possible, and the temperature of the hot melting point should be higher than that of the polymer resin for the inner skin.

Polymer resins suitable for the original purpose of use also have to satisfy these thermal characteristics, so the width of material selection is limited, and since it must be heated in the outer shell, there is a limit to shortening the time required for thermal fusion, and separate cooling for rapid solidification There is a problem with no means.

If the temperature of the metal plate to be heated is increased in order to reduce the fusion time, the thermal deformation of the polymer resin for the shell occurs first, so that the temperature increase of the metal plate to be heated is inevitably limited, so there is a problem that efficient heating cannot be achieved.

Unexamined Patent Publication No. 10-2014-0050293

The problem to be solved of the present invention is to directly heat the center metal foil of the pouch and press the glass light guide plate by transmitting the laser light of the wavelength band having a relatively high light absorption rate from the aluminum foil to the glass light guide plate by transmitting the polymer resin for the outer shell of the pouch. By using it as a device, it is to improve the pressure-fusing characteristics of the pouch and reduce the processing time.

Another problem to be solved by the present invention is that aluminum, which is widely used as a metal foil material for a pouch, has a very low absorption rate of most of the laser light, but is relatively about 15% in the 808nm wavelength band (wavelength band between 800nm and 820nm). The purpose is to reduce the pressure and fusing time by efficiently heating the metal foil by using a diode laser having a high absorption rate.

Another problem to be solved by the present invention is to reduce the fusing time, after inserting the pouch, preheating the metal foil for a set period of time before pressing and fusing the pouch, and then transmitting and heating the upper and lower glass light guide plates using laser light. It is to provide a method and apparatus for fusing a pouch by pressing and fusing the upper and lower glass light guide plates.

Another problem to be solved of the present invention is to appropriately adjust or turn off the intensity of the laser after heating and fusing the polymer resin for the inner skin of the pouch using the temporal control characteristic of the laser light, but the pressure glass light guide plate is The purpose is to quickly cure the fused resin while maintaining it under pressure to improve fusion properties and shorten fusion time.

In the pouch fusing device using a laser and a glass light guide plate, the solution of the present invention is a laser for heating a metal foil constituting a pouch, and a glass for fusing the resin for the inner skin of the pouch dissolved by the heated metal foil. It is to provide a pouch fusing device using a laser and a glass light guide plate composed of a light guide tube.

As a solution to another problem of the present invention, the glass light guide plate provides a pouch fusing device using a glass light guide plate made of a fused silica material having high transmittance of laser light, excellent abrasion resistance, and low expansion rate.

In order to shorten the heating time when heating a metal foil with a laser, a solution to another problem of the present invention is a laser configured to directly heat the metal foil by transmitting the laser light to the glass light guide plate, and then transmitting the polymer resin for the skin. It is to provide a pouch fusing device using and a glass light guide plate.

As a solution to another problem of the present invention, the material of the metal foil is aluminum, and the wavelength of the laser light source is composed of a diode laser having a wavelength between 800 nm and 820 nm, which has a relatively high light absorption rate of the aluminum metal foil. It is to provide a pouch fusing device using a laser and a glass light guide plate that can shorten the heating time of a metal foil.

As a solution to another problem of the present invention, the laser output is configured to be input high during the initial predetermined period in order to improve the pouch thermal fusing efficiency and shorten the time of the fusing process, and gradually low during the later predetermined period. It is to provide a pouch fusing device using.

As a solution to another problem of the present invention, the laser is composed of a plurality of diode laser arrays, and by controlling the output intensity of each diode laser differently in the plurality of diode laser arrays, a laser having a spatially different heat distribution shape and It is to provide a pouch fusing device using a glass light guide plate.

As a solution to another problem of the present invention, the laser is composed of a plurality of diode laser arrays, and an optical system of a cylindrical lens for condensing laser light generated from the plurality of diode laser arrays is interposed between the plurality of diode laser arrays and the glass light guide plate. It is to provide a pouch fusing device using an installed laser and a glass light guide plate.

In order to reduce the fusing time of the present invention, the metal foil is preheated for a set period of time after the pouch is inserted and the pouch is press-fused, and then transmitted through the upper and lower glass light guide plates using laser light to heat the pouch. It is to provide a pouch fusing device using a laser and a glass light guide plate that pressurizes the upper and lower glass light guide plates.

In the pouch fusing method using a laser and a glass light guide plate, a solution to another problem of the present invention includes the step of heating a metal foil by transmitting the laser light through the glass light guide plate, and for the inner skin of the pouch dissolved by the heated metal foil. It is to provide a pouch fusing method using a laser and a glass light guide plate including the step of fusing a resin by pressing it with a glass light guide plate positioned at the upper and lower portions.

In the step of heating the metal foil by transmitting the laser light through the glass light guide plate, the solution to another problem of the present invention is that the material of the metal foil is aluminum, and the wavelength of the laser light source is relatively light absorption rate of the aluminum metal foil. It is to provide a pouch fusing method using a laser and a glass light guide plate composed of a diode laser having a high wavelength between 800 nm and 820 nm.

Another object of the present invention is to solve the problem of the present invention in the step of pressing and fusing with glass light guides located at the top and bottom, the glass light guide plate is made of a fused silica material having high transmittance of laser light, excellent abrasion resistance, and low expansion rate. It is to provide a pouch fusion method using a light guide plate.

The solution to another problem of the present invention is in the step of pressing and fusing with glass light guide plates located on the upper and lower sides, the laser light is composed of a plurality of diode laser arrays, and the laser output of each diode laser from the plurality of diode laser arrays. It is to provide a pouch fusion method using a laser and a glass light guide plate that can achieve spatially different thermal gradient shapes by controlling the intensity of the differently.

In the step of fusing by pressing with glass light guide plates located at the top and bottom as a solution to another problem of the present invention, the metal foil is heated with a plurality of diode laser arrays to rapidly solidify in a press-fused state to maintain stable adhesion. It is to provide a pouch welding method using a laser and a glass light guide plate that maintains a predetermined time by reducing or turning off the intensity of two diode laser outputs.

The present invention transmits the laser light of the wavelength band that transmits the polymer resin for the outer shell of the pouch used as an encapsulation material of a lithium secondary battery to a glass light guide plate made of fused silica to directly heat the metal foil located in the center of the pouch, and the glass light guide plate By using as a pressing element, there is an increased effect that can reduce the pouch pressing and fusing time.

In addition, the present invention provides a diode laser having a relatively high absorption rate of about 15% in a band around 808 nm wavelength (wavelength band between 800 nm and 820 nm), although aluminum, which is widely used as a metal foil material for pouch, has a very low laser light absorption rate. It has an advantageous effect of reducing the pressure welding time by efficiently heating the metal foil by using it.

Another effect of the present invention is that the metal foil is preheated for a set period of time after the pouch is inserted and the pouch is press-fused, and then pressurized to the upper and lower glass light guide plates while heating by transmitting and heating the upper and lower glass light guide plates using laser light. By doing so, there is an advantageous effect of reducing the pressure welding time without deformation of the pouch material.

Another effect of the present invention is that after the polymer resin for the inner skin of the pouch is fused using the temporal control characteristic of the laser light, the intensity of the laser is appropriately adjusted or turned off, but the pressure glass light guide plate is in a pressurized state. While maintaining, it has an advantageous effect of quickly curing (solidifying) the fused resin to improve fusion properties and shorten fusion time.

1 is a photograph of a pouch for sealing a secondary battery.
2 is a structural diagram of a pouch for sealing a secondary battery.
3 shows a conventional pouch thermal welding method.
4 is a diagram showing a heat transfer path when a conventional pouch of a heated metal plate type is pressed and heat-sealed.
5 is a structural diagram of a pouch fusion method using a glass light guide plate and laser light according to the present invention.
6 shows the absorption rate of the metal for each wavelength.
7 shows the physical properties of each glass type.
Figure 8 shows the time characteristics of the thermal welding method using a laser and a glass light guide plate according to the present invention compared to the conventional pouch thermal welding method.
9 is an example of implementing a spatial shape by controlling a plurality of laser arrays.

Look at the specific content for carrying out the present invention.

The present invention is a method and apparatus for thermal welding in a method of directly heating a metal foil located in the center of the pouch by transmitting laser light in a wavelength band that transmits the polymer resin for the outer shell of a pouch to a glass light guide plate, and using the glass light guide plate as a pressing element. It is about.

Pouches composed of various types of polymer resin layers, such as outer and inner layers, centered on a thin aluminum foil, are mainly used in the form of bags, and are especially used as packaging bags for lithium secondary batteries.

The types of metal foils in the pouch, or polymer resins that make up the outer and inner skins are composed of types with characteristics suitable for each purpose, and the polymer resin for inner skin must be made of a thermoplastic resin in order to be heat-sealed by heating.

Looking at the heat transfer path of the conventionally widely used pressurized thermal fusion process, heat is transferred from the metal plate heated to the highest temperature to the thermoplastic resin for the inner skin through the multi-layered polymer resin for the skin and the metal foil. It must be heated above, and only when a predetermined time required for pressurized thermal bonding is maintained to complete the thermal bonding of the pouch.

These prior art technologies have to satisfy the thermal characteristics of polymer resins suitable for the original purpose of use, so the width of material selection is limited, and since they are always heated in the outer shell, there is a limit to shortening the time required for thermal fusion.

In addition, in the case of the prior art, if the temperature of the metal plate to be heated is increased to reduce the pressurization time, the heat deformation of the polymer resin for the shell occurs first, so that the temperature rise of the metal plate to be heated is limited, so efficient heating cannot be achieved. There is a problem.

Due to the above problems, the pouch bonding process is a bottleneck process that does not shorten the time. As a result, it is the cause of production cost increase due to production delay.

The present invention relates to a method and apparatus for fusing a pouch used as a sealing of a secondary battery. Pouches are widely used not only for rechargeable battery bags but also for food packaging.

Types of secondary batteries are divided into pouch-type, cylindrical, and square types, and the largest amount in the industry is pouch-type batteries.

The present invention is directed to a pouch fusing method and apparatus using a laser and a glass light guide plate to solve all the problems of the prior art described above.

It looks at a specific embodiment.

<Example>

A specific embodiment of the present invention will be described on the basis of the drawings, various theoretical descriptions, and configurations.

Among the terms in the specification of the present invention,'laser' used when heating a metal foil is more specifically'diode laser array','diode laser', or'laser', and the length of the term is shortened and used interchangeably. It refers to a'laser light source' for heating the metal foil and has the same to substantially the same meaning.

In the specification of the present invention, the upper and lower portions are described based on the drawings, and various modifications are possible.

The heat fusion of the pouch requires a structure to be pressed at the same time as heating, and in the present invention, in order to shorten the heat fusion time, the polymer resin for the skin directly heats the metal foil by using a laser light of a wavelength that transmits. By dissolving the resin and applying pressure, it is fused.

Aluminum, which is widely used as a metal foil material for pouch, generally has a very low absorption rate of laser light, but has a relatively high absorption rate of about 15% in the 808nm wavelength band (wavelength band between 800nm and 820nm).

6 shows the absorption rate of metal by wavelength.

As can be seen from FIG. 6, aluminum (Al) has an absorption rate of about 15% in a band around the 808 nm wavelength, which shows a relatively high absorption rate compared to other wavelengths.

The pouch is generally a thin polymer resin layer with a thickness of about 100 μm, so its own heat capacity is not very large, so high-speed thermal bonding is possible even with laser light.

A laser with a wavelength band between 808nm is a high-power semiconductor laser, and it is preferable as a heat-fusion light source that melts and bonds the polymer resin for the inner skin because it can efficiently heat the metal foil by condensing it on the incident surface of the glass light guide plate using an appropriate optical system. .

The laser light of sufficient intensity to heat-sealing the pouch is a method or technical configuration that requires a little more complexity and cost compared to the heated metal plate, but can implement an instantaneous temperature gradient, and also implements different temperature characteristics spatially. There are increased effects such as ease of use.

It is easy to control the temperature characteristics of time and space in the case of pressure heat fusion of a pouch using a laser light source according to the present invention.

Thermal fusion of a pouch using aluminum foil is performed by using a plurality of diode laser arrays having a wavelength band between 800 nm and 820 nm to condense and incident on the surface of a glass light guide plate having a predetermined area, while proceeding with total reflection on the side of the glass light guide plate and on the other side. It emits light that is more homogeneous than the incident surface.

Using an optical device (optical device in Fig. 4) composed of cylindrical lens arrays for efficiently condensing laser light emitted from a plurality of diode laser arrays, the output of a plurality of diode lasers is converted to a set area of the metal foil. Can be condensed.

The incident surface and the exit surface of the glass light guide plate are optically polished, and the incident surface is manufactured to increase the optical transmission rate by applying a broadband anti-reflective coating in the wavelength band between 800 nm and 820 nm.

The material of the glass light guide plate should be selected in consideration of optical properties, mechanical properties, and thermal properties.

Fused silica-based glass has excellent light transmittance in the visible-near-infrared (600nm-1.5um band) range, has excellent abrasion resistance, and has a low coefficient of thermal expansion, so it is not damaged even by rapid temperature changes. It is the most preferable material for the required glass light guide plate.

7 shows the physical properties of each glass type.

As shown in FIG. 7, the fused silica-based glass has excellent wear resistance compared to B270 and BK-7, in particular, has a low coefficient of thermal expansion, and has excellent light transmittance of 96% or more.

The most enhanced effect of the present invention is to dissolve the resin for the inner skin by directly heating the metal foil with laser light, compared to heating from the polymer resin for the outer skin of the pouch with a conventional heated metal plate until the polymer resin for the inner skin is melted. Because it is pressurized and bonded (the polymer resin for the skin is transparent), the heat bonding time of the pouch can be shortened, and the intensity of the plurality of diode laser light as a light source is spatially adjusted to It can increase homogeneity and reduce defects.

Using the temporal control characteristic of the laser light, after the polymer resin for the inner skin of the pouch is dissolved, the intensity of the laser is appropriately adjusted or turned off, but the dissolved resin is quickly cured while maintaining the pressure glass light guide plate in a pressurized state. By doing so, it is possible to shorten the process time while improving the fusion properties.

It is not easy to shorten the process time since it is impossible to change the temperature for a short time of ms in the conventionally used heating metal plate.

5, which includes the technical configuration of the present invention, will be described in detail.

The pouch thermal welding device using a laser and a glass light guide plate consists of two sets of top and bottom (or left and right). The laser light (42 in FIG. 5) emitted from the upper diode laser array (41 in FIG. 5) passes through an optical system (43 in FIG. 5) composed of cylindrical lens arrays and passes through the glass light guide plate (44 in FIG. 5). ), and the glass light guide plate exit portion is pressed at both the upper and lower portions of the pouches (45 in FIG. 5) to be heat-sealed with a predetermined force and interval.

The meaning of the predetermined force and spacing means the degree of pressure that the upper and lower glass light guide plates press each other during press-fusing when manufacturing a conventional pouch, and the distance between the upper and lower glass light guide plates that press the pouch.

In the case of heating the metal foil of the lower pouch, it is composed of a lower diode laser array and a glass light guide plate for pressing in the same manner as when heating the metal foil of the upper pouch described above based on FIG. 5.

As shown in Fig. 5, the present invention includes a diode laser power supply (46 in Fig. 5), a diode laser cooling unit (47 in Fig. 5), and a diode laser control unit (48 in Fig. 5), and uses the same. Thus, pressurized thermal fusion is performed for a predetermined period of time.

A pouch using a metal (aluminum) foil can obtain relatively high light absorption characteristics when a diode laser having a wavelength of 800 nm to 820 nm is used as a light source.

That is, when the metal foil is directly heated using a laser light source having such a wavelength, the time to dissolve the polymer resin for the inner skin is shortened by heating the metal (aluminum) foil constituting the pouch, and the resin for the inner skin is quickly pressed. By fusing, the fusing process can be quickly terminated.

The glass light guide plate made of fused silica has excellent advantages in optical properties, mechanical properties, and thermal properties.

The laser light intensity is controlled by an appropriate time function in consideration of the type of metal foil constituting the pouch and the characteristics of the polymer resins, and the laser light output is turned off or the laser light intensity is adjusted after the inner skin polymer resin is melted. In the meantime, when the glass light guide plate is kept under pressure, the solidification (solidification) of the inner skin polymer resin proceeds faster, reducing the bonding failure rate, and has an increased effect that can shorten the overall welding process time.

In FIG. 5, reference numeral 50 denotes a pressure and position control device for a glass light guide plate.

In FIG. 5, reference numerals 44 and 54 denote upper and lower glass light guide plates (44 and 54 in FIG. 5) for press-fusing the polymer resin melted by heating the metal foil by laser light.

The laser light generated by the diode laser is condensed while passing through the optical system (43 in Fig. 5), and is configured to pass through the glass light guide plate to directly heat the metal foil to be heated.

In Fig. 5, reference numeral 51 denotes a polymer resin for an outer skin, reference numeral 52 denotes a metal foil (aluminum), and reference numeral 53 denotes a polymer resin for an inner skin.

8 shows the temporal characteristics of the laser light thermal welding method according to the present invention compared to the conventional pouch thermal welding method.

As shown in the upper part of Fig. 8, the conventional (conventional) thermal fusion method using a heated metal plate is a technical configuration that does not allow a separate time for solidification because pressing must be performed for a set time with the heated metal plate. .

On the other hand, in the case of using the laser light thermal welding method and apparatus according to the present invention, a separate process or means for preheating may be provided before pressure welding, and even during pressure welding while heating using laser light, the laser The fusion process can be performed by controlling the intensity of the output equally or differently according to time, and a cooling process for solidification can be provided separately.

During the solidification process, the intensity of the diode laser output is reduced or turned off compared to the maximum output, and then cooled for a set time to rapidly solidify.

Referring to the drawing shown in the lower part of FIG. 8, in order to reduce the fusing time, after inserting a pouch (material) to press fuse the pouch, the metal foil is preheated with laser light for a set period of time before pressing the pouch. Thereafter, the upper and lower pouch are press-fused with the upper and lower glass light guide plates installed to face each other while transmitting and heating the upper and lower glass light guide plates using laser light, and configured to have a time to solidify at the end. The front part maintains the intensity of the laser output for a set time higher than the back part, and the rear part can be configured to gradually decrease the intensity of the laser output.

In the case of performing pressurized thermal bonding of the pouch as in the present invention, not only can the time required for thermal bonding be shortened, but also the quality of the produced product can be made uniform, and the deformation of the material during the heating process is prevented. It has a beneficial effect that can be minimized or minimized.

The laser uses a plurality of diode laser arrays, and has the advantage of realizing an optimal shape spatially by controlling the output intensity of each, and FIG. 9 shows one embodiment specifically illustrating this.

9 shows an example of implementing a spatial shape by controlling the output intensity of a plurality of diode laser arrays according to the present invention.

As shown in Fig. 9, by using a plurality of diode lasers (LD#1, LD#2, ㆍㆍㆍ LD#N), the metal foil to be heated can be heated spatially (position) and only the required part, each space It can be adjusted so that it can be heated with different power intensities.

More specifically, as shown in FIG. 9, the output strength of LD#1 in the diode laser array is controlled to 50% of the maximum output, and LD#2 and LD#3 are controlled to 100% of the output strength, and the last diode When the power intensity of the laser LD#N is controlled to 50% of the maximum power, the spatial shape of the laser power intensity is two-dimensionally represented as shown in the lower part of FIG. 9.

9, among a plurality of diode lasers (LD#1, LD#2, LD#3··· LD#N), the output intensity of each diode laser differs from the current supplied to each diode laser and/or It is possible to control to generate different and/or partially identical outputs by controlling some of the same.

The output intensity of each diode laser can be controlled to 50% or less, 50%, 60%, 70% ㆍㆍㆍ 100% as needed based on the maximum power.

Based on the above-described technical configuration, look at the scope of protection for protecting the present invention.

In the pouch fusing apparatus using a laser and a glass light guide plate, it is composed of a laser for heating a metal foil constituting a pouch, and a glass light guide plate for fusing resin for an inner skin of a pouch dissolved by the heated metal foil.

In one embodiment of the present invention, the glass light guide plate is made of a fused silica material having high transmittance of laser light, excellent wear resistance, and low expansion rate.

In another embodiment of the present invention, when heating the metal foil with a laser, the laser light passes through the glass light guide plate, and then the metal foil is directly heated by passing through the polymer resin for the skin.

In another embodiment of the present invention, the material of the metal foil is aluminum, and for rapid heating of the metal foil, the wavelength of the laser light source is between 800 nm and 820 nm in which the heat absorption rate of the aluminum metal foil is relatively high. It consists of an excitation diode laser.

In another embodiment of the present invention, the laser output is a technical configuration that can be input high during the initial predetermined period in order to improve the pouch pressurization thermal welding efficiency and shorten the time of the fusing process, and gradually input low during the later predetermined period.

Another embodiment of the present invention is a technical configuration in which the laser is composed of a plurality of diode laser arrays, and spatially different fusion shapes are implemented by differently controlling the output intensity of each diode laser in the plurality of diode laser arrays. to be.

Another embodiment of the present invention is that the laser consists of a plurality of diode laser arrays, and an optical system of a cylindrical lens for condensing laser light generated from the plurality of diode laser arrays is installed between the plurality of diode laser arrays and the glass light guide plate. It is a technical composition.

In another embodiment of the present invention, in order to reduce the fusion time, the metal foil is preheated for a set period of time after the pouch is inserted and the pouch is press-fused, and the upper and lower glass light guide plates are transmitted and heated using a laser light. It is a technical configuration that pressurizes the upper and lower glass light guide plates.

In another embodiment of the present invention, the incident surface and the exit surface of the glass light guide plate are optically polished, and the incident surface is subjected to a broadband anti-reflection coating in a wavelength band between 800 nm and 820 nm in order to increase light transmission efficiency.

Next, a pouch fusing method using a laser and a glass light guide plate according to the present invention will be described.

Another embodiment of the present invention is a pouch fusing method using a laser and a glass light guide plate, wherein the laser light passes through the glass light guide plate to heat the metal foil, and the inner skin of the pouch dissolved by the heated metal foil And fusing the resin by pressing it with glass light guide plates positioned at the upper and lower portions.

In another embodiment of the present invention, in the step of heating the metal foil by transmitting the laser light through the glass light guide plate, the material of the metal foil is aluminum, and the wavelength of the laser light source is that the heat absorption rate of the metal foil made of aluminum is relatively It consists of a diode laser with a wavelength between 800 nm and 820 nm as high.

In another embodiment of the present invention, in the step of fusing by pressing with glass light guide plates located at the top and bottom, the glass light guide plate is made of a fused silica material having high transmittance of laser light, excellent abrasion resistance, and low expansion rate.

In another embodiment of the present invention, in the step of fusing by pressing with glass light guide plates located at the top and bottom, the laser light is composed of a plurality of diode laser arrays, and the laser output of each diode laser in the plurality of diode laser arrays. It is a technical configuration that realizes spatially different fusion shapes by controlling the intensity of the fusion differently.

In another embodiment of the present invention, in the step of fusing by pressing with glass light guide plates located at the top and bottom, a plurality of diode laser arrays are used to heat a metal foil to rapidly solidify in a press-fused state to maintain stable adhesion. To maintain a predetermined time by reducing and/or turning off the intensity of the two diode laser outputs.

In the present invention, aluminum, which is widely used as a metal foil material in a pouch that is widely used as a sealing material for lithium secondary batteries, has a very low general laser light absorption rate, but has a relatively high light absorption rate of about 15% in the 808nm wavelength band. Shortening the pressing time by providing a pouch welding method and device using a glass light guide plate and laser light that directly heats the metal foil by condensing a composition and a plurality of laser light sources to pass through the polymer resin for the skin to fuse the glass light guide plate with a pressure element. There is a beneficial effect that can be done, so the possibility of industrial use is very high.

11; Skin polymer resin 12; Metal foil
13; Inner skin polymer resin 14; Heat fusion site
21; Pressurization 22; Upper heating metal plate
23; Pouch 24; Heat fusion site
25; Lower heating metal plate 25; Pressure
31; Pressure
32; Upper heating metal plate (one example 220℃)
33; Polymer resin for outer skin (180℃ for one example)
34; Polymer resin for inner skin (one example 150℃)
35; Lower heating metal plate 35; Pressure
41; Diode laser array 42; Laser light
43; Optical system 44; Glass light guide plate (top)
45; Pouch 46; Diode laser power supply
47; Cooling device 48; Control device
50; Glass light guide plate pressure and position control device
51; Skin polymer resin 52; Metal foil (aluminum)
53; Inner skin polymer resin 54; Glass light guide plate (lower)
55; Laser light 56; Optical system

Claims (14)

In the pouch fusing device using a laser and a glass light guide plate,
A laser for heating the metal foil constituting the pouch; And
It includes a glass light guide plate for fusing the resin for the inner skin of the pouch dissolved by the heated metal foil,
The laser is composed of a plurality of diode laser arrays,
A pouch fusing device using a laser and a glass light guide plate, characterized in that the output intensity of each diode laser is controlled differently in a plurality of diode laser arrays to realize spatially different fusion shapes. The method of claim 1,
A glass light guide plate is a pouch fusing device using a laser and a glass light guide plate, characterized in that it is made of a fused silica material having high transmittance of laser light, excellent abrasion resistance, and low expansion rate. The method according to claim 1 or 2,
When heating a metal foil with a laser, a pouch using a laser and a glass light guide plate, characterized in that the laser light passes through the glass light guide plate to shorten the heating time, and then directly heats the metal foil by passing through the polymer resin for the skin. Fusing device. The method according to claim 1 or 2,
The material of the metal foil is aluminum, and the wavelength of the laser light source is a pouch using a laser and a glass light guide plate, characterized in that it is composed of a diode laser having a wavelength between 800 nm and 820 nm, which has a relatively high light absorption rate of the aluminum metal foil. Fusing device. The method according to claim 1 or 2,
Laser and glass light guide plate, characterized in that the initial predetermined period is input higher than the later predetermined period and the later predetermined period is gradually lower than the initial predetermined period in order to improve the pouch thermal welding efficiency and shorten the time of the fusing process. Pouch fusing device using. delete The method according to claim 1 or 2,
The laser consists of a plurality of diode laser arrays, and an optical system of a cylindrical lens for condensing laser light generated from a plurality of diode laser arrays is installed between the plurality of diode laser arrays and the glass light guide plate. Pouch fusing device. The method according to claim 1 or 2,
To reduce the fusing time, after inserting the pouch, preheating the metal foil for a set period of time before pressing fusing the pouch, passing through the upper and lower glass light guide plates using laser light, and heating the upper and lower glass light guide plates under pressure. Pouch fusing device using a laser and a glass light guide plate, characterized in that. The method according to claim 1 or 2,
A pouch fusing device using a laser and a glass light guide plate, characterized in that the incident surface and the exit surface of the glass light guide plate are optically polished, and the incident surface is coated with a broadband anti-reflection coating in a wavelength band between 800 nm and 820 nm in order to increase light transmission efficiency. In the pouch fusing method using a laser and a glass light guide plate,
Heating the metal foil by transmitting the laser light through the glass light guide plate; And
Comprising the step of pressing and fusing the resin for the inner skin of the pouch dissolved by the heated metal foil with glass conduit tubes located at the upper and lower portions,
The laser light is composed of a plurality of diode laser arrays in the step of fusing by pressing with glass light guide plates located at the top and bottom,
Pouch welding method using a laser and a glass light guide plate, characterized in that the intensity of laser output of each diode laser is controlled differently in a plurality of diode laser arrays to realize spatially different fusion shapes. The method of claim 10,
In the step of heating the metal foil by transmitting the laser light through the glass light guide plate, the material of the metal foil is aluminum, and the wavelength of the laser light source is between 800 nm and 820 nm, where the heat absorption rate of the aluminum metal foil is relatively high. Pouch welding method using a laser and a glass light guide plate, characterized in that it is composed of a diode laser excitation The method of claim 10 or 11,
In the step of fusing by pressing with glass light guide plates located at the top and bottom, the glass light guide plate is made of fused silica material with high transmittance of laser light, excellent abrasion resistance, and low expansion rate. Way. delete The method of claim 10 or 11,
In the step of pressing and fusing with glass light guide plates located at the top and bottom, the intensity of the output of the plurality of diode lasers is reduced to maintain stable adhesion by heating the metal foil with a plurality of diode laser arrays and rapidly solidifying in a press-fused state, or A pouch fusing method using a laser and a glass light guide plate, further comprising the step of turning off and maintaining a predetermined time.

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