Laser heating device for coating and drying lithium battery

Abstract

The utility model provides a laser heating device for coating and drying a lithium battery, and relates to the technical field of a lithium battery manufacturing process. The laser heating mode is adopted to replace the infrared heating mode in the prior art, the laser heating can be matched with the heating laser source with the proper wavelength according to the characteristics of the heated object, and therefore compared with the infrared heating mode in the prior art, the directional heating efficiency is better, and the energy efficiency absorption rate is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery manufacturing technology, in particular to a laser heating device used for coating and drying of lithium batteries. Background Art

[0002] In the lithium battery coating industry, the coating process is one of the most important links in the entire process chain and also the link with the highest energy consumption; it determines the production capacity and efficiency of the entire equipment; at the same time, the coating machine is a unit with a very high equipment cost in the entire lithium battery production process; therefore, improving the production efficiency of the coating machine is currently very important. The main reason why the existing coating machine affects the production efficiency is that the pole piece cannot be effectively dried. The main heating method of the oven is hot air circulation heating, and the heat source includes electric heating tubes, steam heat exchangers, mold temperature controllers, etc.

[0003] In order to improve the production efficiency of the coating machine, in the prior art, a structure combining hot air circulation and infrared heating tubes is usually used to dry the electrode in the drying area, wherein the infrared heating tubes are used for auxiliary heating, so that the inside and outside of the electrode can be dried simultaneously. However, due to the wide wavelength distribution of infrared rays, the targeted heating effect on the coating material on the surface of the electrode is poor, the energy utilization rate is low, and the drying efficiency is limited. Utility Model Content

[0004] The purpose of the utility model is to provide a laser heating device for lithium battery coating and drying, so as to alleviate the technical problems existing in the prior art that the wavelength distribution of infrared rays is relatively wide, the targeted heating effect on the coating material on the surface of the electrode is relatively poor, the energy utilization rate is low, and the drying efficiency is limited.

[0005] In a first aspect, the utility model provides a laser heating device for lithium battery coating and drying, which is arranged in a drying area, and includes a light source end, a transmission optical fiber, and an emission end. The light source end is outside the drying area, and the emission end is inside the drying area. The light source end and the emission end are connected with the transmission optical fiber;

[0006] The emitting end is used to emit the laser from the light source end to the surface of the pole piece in the drying area.

[0007] In combination with the first aspect, the utility model provides a first possible implementation manner of the first aspect, wherein the transmitting end includes a cover plate and a dot matrix plate, the cover plate covers the dot matrix plate, and a receiving cavity is enclosed between the cover plate and the dot matrix plate;

[0008] The transmission optical fiber passes through the cover plate and is connected to the dot matrix plate, and the dot matrix plate is used to fix and distribute the ends of the transmission optical fiber.

[0009] In combination with the first possible implementation of the first aspect, the utility model provides a second possible implementation of the first aspect, wherein the dot matrix plate includes a plurality of light-transmitting holes, and the plurality of light-transmitting holes are used to set the density of laser radiation toward the drying area.

[0010] In combination with the second possible implementation of the first aspect, the utility model provides a third possible implementation of the first aspect, wherein a fiber optic quick-plug port is provided on the side of the cover plate, and the transmission optical fiber is inserted into the accommodating cavity along the fiber optic quick-plug port.

[0011] In combination with the third possible implementation of the first aspect, the utility model provides a fourth possible implementation of the first aspect, wherein a beam splitter is provided at the end of the socket facing the accommodating cavity, and the beam splitter is used to decompose the light beam transmitted by the transmission optical fiber.

[0012] In combination with the fifth possible implementation of the first aspect, the utility model provides a fifth possible implementation of the first aspect, wherein the transmitting end also includes a protective plate, the protective plate is connected to the dot matrix plate, and the protective plate is made of a transparent material.

[0013] In combination with the fifth possible implementation of the first aspect, the utility model provides a sixth possible implementation of the first aspect, wherein the dot matrix plate is provided with a card slot, and the card slot is used for plugging the dot matrix plate and the protective plate.

[0014] In combination with the sixth possible implementation of the first aspect, the utility model provides a seventh possible implementation of the first aspect, wherein the dot matrix plate includes a plurality of fixed terminals, the fixed terminals are embedded in the light-transmitting holes of the dot matrix plate, and the transmission optical fiber is plugged into the fixed terminals. In combination with the sixth possible implementation of the first aspect, the utility model provides an eighth possible implementation of the first aspect, wherein the light source end includes a plurality of laser emitting chips, and the lasers output by the plurality of laser emitting chips are transmitted to the emitting end through the transmission optical fiber.

[0015] In combination with the sixth possible implementation of the first aspect, the utility model provides a ninth possible implementation of the first aspect, wherein the outside of the transmission optical fiber is wrapped with a protective layer.

[0016] The embodiments of the utility model bring the following beneficial effects: laser heating is adopted to replace the infrared heating method in the prior art. The laser heating can match the heating laser source with a suitable wavelength according to the characteristics of the heated object, and thus compared with the infrared heating method in the prior art, the directional heating efficiency is better and the energy efficiency absorption rate is higher; at the same time, in order to avoid the disadvantage of the poor high temperature resistance of the laser chip, the embodiment adopts a method including a light source end, a transmission optical fiber, and a transmitting end, wherein the light source end is outside the drying zone, and the transmitting end is inside the drying zone, and the light source end and the transmitting end are connected with a transmission optical fiber, wherein a plurality of groups of laser transmitting chips can be provided in the light source end for packaging. Since the light source end is arranged outside the zone, the hidden dangers of the laser transmitting chip caused by the high temperature environment can be avoided. The transmitting end is used to transmit the laser of the light source end to the surface of the pole piece in the drying zone. The infrared wavelength distribution in the prior art is relatively wide, the targeted heating effect on the coating material on the surface of the pole piece is relatively poor, the energy utilization rate is low, and the drying efficiency is limited. The technical problems achieve the technical effect of improving the directional heating of the pole piece and improving the drying efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the principle of a laser heating device for coating and drying of lithium batteries provided in an embodiment of the utility model;

[0019] Figure 2 A schematic diagram of the external structure of the emitting end of the laser heating device for coating and drying of lithium batteries provided in an embodiment of the utility model;

[0020] Figure 3 A schematic diagram of the structure of a dot matrix plate of a laser heating device for coating and drying of lithium batteries provided in an embodiment of the utility model;

[0021] Figure 4 A schematic diagram of the light fixing terminal structure in a laser heating device for coating and drying of lithium batteries provided in an embodiment of the utility model.

[0022] Icons: 10 - light source end; 20 - transmission optical fiber; 30 - transmitting end; 31 - cover plate; 32 - dot matrix plate; 33 - light transmission hole; 34 - optical fiber quick connector; 35 - protective plate; 36 - fixed terminal. DETAILED DESCRIPTION

[0023] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] like Figure 1 - Figure 4 As shown, the utility model provides a laser heating device for lithium battery coating and drying, which is arranged in a drying area, and includes a light source end 10, a transmission optical fiber 20, and a transmitting end 30. The light source end 10 is outside the drying area, and the transmitting end 30 is inside the drying area. The light source end 10 and the transmitting end 30 are connected with the transmission optical fiber 20;

[0027] The emitting end 30 is used to emit the laser light from the light source end 10 to the surface of the pole piece in the drying area.

[0028] By replacing the infrared heating in the prior art with laser heating, the laser heating can match the heating laser source with a suitable wavelength according to the characteristics of the heated object, and thus, compared with the infrared heating method in the prior art, the directional heating efficiency is better and the energy efficiency absorption rate is higher; at the same time, in order to avoid the weakness of the laser chip's poor resistance to high temperature, the present embodiment adopts a method including a light source end 10, a transmission optical fiber 20, and a transmitting end 30, wherein the light source end 10 is outside the drying zone, and the transmitting end 30 is inside the drying zone, and the light source end 10 and the transmitting end 30 are connected with the transmission optical fiber 20, wherein a plurality of groups of laser transmitting chips can be provided in the light source end 10 for packaging, and since the light source end 10 is provided outside the zone, the hidden dangers of the laser transmitting chip caused by the high temperature environment can be avoided, and the transmitting end 30 is used to transmit the laser of the light source end 10 to the surface of the pole piece in the drying zone, the infrared wavelength distribution in the prior art is relatively wide, the targeted heating effect on the coating material on the surface of the pole piece is relatively poor, the energy utilization rate is low, and the drying efficiency is limited. The technical effects of improving the directional heating of the pole piece and improving the drying efficiency are achieved.

[0029] It should be noted that the transmitting end 30 can be fixed in the drying area by using a bracket, a connecting rod, etc. according to actual conditions.

[0030] Furthermore, the transmitting end 30 includes a cover plate 31 and a dot matrix plate 32, the cover plate 31 covers the dot matrix plate 32, and a receiving cavity is enclosed between the cover plate 31 and the dot matrix plate 32;

[0031] The transmission optical fiber 20 passes through the cover plate 31 and is connected to the dot matrix plate 32 , and the dot matrix plate 32 is used to fix and distribute the ends of the transmission optical fiber 20 .

[0032] By covering the cover plate 31 with the dot matrix plate 32 and enclosing a receiving cavity between the cover plate 31 and the dot matrix plate 32, sufficient installation space is provided for the end of the transmission light, wherein the transmission optical fiber 20 passes through the cover plate 31 and is connected to the dot matrix plate 32, and the dot matrix plate 32 is used to fix and distribute the end of the transmission optical fiber 20, wherein the dot matrix plate 32 is evenly distributed with a plurality of tiny light-transmitting holes 33, and the laser forms a laser dot matrix through the dot matrix plate 32.

[0033] Furthermore, the dot matrix plate 32 includes a plurality of light-transmitting holes 33, and the plurality of light-transmitting holes 33 are used to set the density of laser radiation toward the drying area.

[0034] The staff can set the shape of the laser emitted along the light-transmitting holes 33 by setting the arrangement form, distribution area, number and other factors of the light-transmitting holes 33 according to the specific distribution of the plates in the drying area.

[0035] At the same time, in order to enhance the light transmission effect of the light-transmitting hole 33 , a lens may also be provided at the light-transmitting hole 33 to enhance the energy gathering of the laser light.

[0036] It should be noted that the cover plate 31 in the transmitting end 30 can also be in the form of being hinged to the rod body and the cavity, and is arranged in the adding area to facilitate the adjustment of the angle of the laser beam.

[0037] Furthermore, a fiber optic quick-insert port 34 is provided on the side of the cover plate 31 , and the transmission optical fiber 20 is inserted into the accommodating cavity along the fiber optic quick-insert port 34 .

[0038] In this embodiment, a light quick-insert port is provided on the side of the cover plate 31. The quick-insert port is circular in shape, which facilitates the insertion of multiple transmission pipelines into the accommodating cavity along the optical fiber quick-insert port 34, while avoiding collision of the transmitted light caused by the angle shape.

[0039] Furthermore, a beam splitter is provided at the end of the optical fiber quick plug 34 facing the accommodating cavity, and the beam splitter transmits the light beam transmitted by the optical fiber 20. The beam splitter is provided at the end of the optical fiber quick plug 34 facing the accommodating cavity, and the staff can use the beam splitter to split the light beams transmitted by multiple transmission optical fibers 20, so as to facilitate the control of the distribution and quantity of the transmitted light.

[0040] Furthermore, the dot matrix plate 32 includes a plurality of fixed terminals 36 , the fixed terminals 36 are embedded in the light-transmitting holes 33 of the dot matrix plate 32 , and the transmission optical fibers 20 are plugged into the fixed terminals 36 .

[0041] Furthermore, the transmitting end 30 further includes a protection plate 35 , which is connected to the dot matrix plate 32 and is made of a transparent material.

[0042] The fixed terminal 36 is embedded in the surface of the dot matrix plate 32, and the transmission optical fiber 20 is detachably connected to the dot matrix plate 32 by plugging the fixed terminal 36, which is convenient for connection. At the same time, there is a certain spacing space between the dot matrix plate 32 and the transmission optical fiber 20, and the protective plate 35 is used to protect the spacing space.

[0043] It should be noted that the protection plate 35 adopts infrared projection glass, which can not only allow infrared rays to pass through the protection plate 35 to improve energy utilization, but also the transparent material makes it easy for staff to observe the internal line connection status.

[0044] Furthermore, the dot matrix plate 32 is provided with a card slot, and the card slot is used for plugging the dot matrix plate 32 and the protective plate 35 .

[0045] The dot matrix plate 32 is provided with a slot adapted to the protective plate 35 , and the protective plate 35 is connected to the dot matrix plate 32 in a plug-in manner to protect the transmission light inside the cavity and facilitate assembly by the staff.

[0046] Furthermore, the light source end 10 includes a plurality of laser emitting chips, and the lasers output by the plurality of laser emitting chips are transmitted to the emitting end 30 through the transmission optical fiber 20 .

[0047] The light source end 10 is packaged by multiple groups of laser emission chips. A single laser generator chip can independently control its power and on / off. Through operations such as optical fiber transmission and laser beam splitting, single-point multi-control can be achieved. By setting multiple laser emission chips, the following technical effects can be achieved:

[0048] 1. The light source end 10 can control multiple transmitting ends 30 in different states at the same time.

[0049] 2. Since it is possible to realize single-point multi-space, when the transmitting end 30 structure is finalized, the radiation heating area and the radiation heating power can also be adjusted;

[0050] Furthermore, the outside of the transmission optical fiber 20 is wrapped with a protective layer.

[0051] The outside of the transmission optical fiber 20 is wrapped with a protective layer, wherein the protective layer contains high temperature resistant and corrosion resistant materials to prevent the body of the transmission optical fiber 20 from being damaged by a high temperature environment.

[0052] This embodiment achieves the following technical effects:

[0053] 1. Concentrated wavelength matching range: The laser heating source is selected to match the heating object, the laser wavelength distribution is concentrated, and the energy efficiency absorption efficiency is high;

[0054] 2. Energy saving and efficiency improvement: The conversion efficiency of laser is about 50%, which is higher than the energy utilization rate of traditional hot air heating. Therefore, it can save energy and improve the drying efficiency at the same time;

[0055] 3. Good heating directionality: The laser has good directionality, so the drying area can be controlled, the heating power density is high, and the heating efficiency is fast.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A laser heating device for lithium battery coating and drying, arranged in a drying area, characterized in that: It comprises a light source end (10), a transmission optical fiber (20), and a transmitting end (30), wherein the light source end (10) is outside the drying area, the transmitting end (30) is inside the drying area, and the light source end (10) and the transmitting end (30) are connected to the transmission optical fiber (20); The transmitting end (30) is used to transmit the laser light from the light source end (10) to the surface of the pole piece in the drying area; The transmitting end (30) comprises a cover plate (31) and a dot matrix plate (32), wherein the cover plate (31) covers the dot matrix plate (32), and a receiving cavity is enclosed between the cover plate (31) and the dot matrix plate (32); The transmission optical fiber (20) passes through the cover plate (31) and is connected to the dot matrix plate (32), and the dot matrix plate (32) is used to fix and distribute the end of the transmission optical fiber (20).

2. The laser heating device for coating and drying of lithium batteries according to claim 1, characterized in that: The dot matrix plate (32) comprises a plurality of light-transmitting holes (33), and the plurality of light-transmitting holes (33) are used to set the density of laser radiation toward the drying area.

3. The laser heating device for coating and drying of lithium batteries according to claim 1, characterized in that: An optical fiber quick-insertion port (34) is provided on the side of the cover plate (31), and the transmission optical fiber (20) is inserted into the accommodating cavity along the optical fiber quick-insertion port (34).

4. The laser heating device for coating and drying of lithium batteries according to claim 3, characterized in that: The optical fiber quick plug port (34) is provided with a beam splitter at the end facing the accommodating cavity, and the beam splitter is used to decompose the light beam transmitted by the transmission optical fiber (20).

5. The laser heating device for coating and drying of lithium batteries according to claim 3, characterized in that: The transmitting end (30) further comprises a protective plate (35), wherein the protective plate (35) is connected to the dot matrix plate (32), and the protective plate (35) is made of a transparent material.

6. The laser heating device for coating and drying of lithium batteries according to claim 5, characterized in that: The dot matrix plate (32) is provided with a card slot, and the card slot is used for plugging the dot matrix plate (32) and the protective plate (35).

7. The laser heating device for coating and drying of lithium batteries according to claim 2, characterized in that: The dot matrix plate (32) comprises a plurality of fixed terminals (36), the fixed terminals (36) are embedded in the light-transmitting holes (33) of the dot matrix plate (32), and the transmission optical fibers (20) are plugged into the fixed terminals (36).

8. The laser heating device for coating and drying of lithium batteries according to claim 1, characterized in that: The light source end (10) comprises a plurality of laser emitting chips, and the lasers output by the plurality of laser emitting chips are transmitted to the emitting end (30) through the transmission optical fiber (20).

9. The laser heating device for coating and drying of lithium batteries according to claim 1, characterized in that: The transmission optical fiber (20) is wrapped with a protective layer on the outside.

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