CN217485546U - Heating device and battery hot-pressing formation equipment applying same - Google Patents
Heating device and battery hot-pressing formation equipment applying same Download PDFInfo
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- CN217485546U CN217485546U CN202221082640.8U CN202221082640U CN217485546U CN 217485546 U CN217485546 U CN 217485546U CN 202221082640 U CN202221082640 U CN 202221082640U CN 217485546 U CN217485546 U CN 217485546U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The utility model discloses a heating device and battery hot pressing that uses becomes equipment thereof relates to heating device technical field. The heating device comprises a clamp pressing plate and a heating chip, wherein the heating chip is arranged on the surface of the clamp pressing plate; the heating chip comprises a heating film and a conductive belt, and a conductive layer is arranged on the surface of the heating film; the conductive belt is arranged on the conductive layer and comprises a first conductive belt, a second conductive belt and a third conductive belt, the first conductive belt and the second conductive belt are oppositely arranged, and the third conductive belt is arranged between the first conductive belt and the second conductive belt; the tail end of the third conductive belt is connected with the second conductive belt, the front end of the third conductive belt is positioned on the inner side of the first conductive belt, and the conductive layer is provided with an insulating groove surrounding the third conductive belt; the front end of the third conductive band and the first conductive band are both provided with connecting leads. The heating device solves the problems that the existing battery hot-pressing formation equipment is uneven in heating, large in surface temperature difference, low in heating speed, high in heat loss, large in energy consumption, inaccurate in temperature control and the like.
Description
Technical Field
The utility model relates to a heating device technical field especially relates to a heating device and battery hot briquetting becomes equipment of using thereof.
Background
Formation is an important process in the production process of the battery, and affects the charge and discharge performance and the service life of the battery. The battery hot-pressing formation equipment can complete the formation and hot-pressing shaping of the battery at the same time, so that the production procedures can be reduced, the production period can be shortened, the labor cost can be reduced, and the production efficiency can be improved.
The existing hot-pressing formation equipment adopts an electric heating rod to heat a metal clamp, heat is conducted to a battery through the metal clamp, and the battery absorbs heat and heats up. The heating method needs to conduct heat to the surface of the battery through the clamp, so the clamp needs to use materials with good heat conduction capacity and mechanical property, such as metal, and the like, and the clamp has large mass and high cost, so that the equipment is heavy and expensive. Because the metal clamp is exposed in the air, the larger heat transfer area leads to more heat to be dissipated into the air through convection heat transfer, so that heat loss and energy waste are caused, meanwhile, the temperature rise speed of the battery is reduced, the formation time of the battery is increased, and the production efficiency is reduced. The heat is conducted to the metal clamp to contact with the battery through the temperature difference formed by heating through the electric heating rods at the two ends of the clamp, so that the temperature distribution of the metal clamp is uneven, and the formation quality of the battery is influenced. In addition, the heating device of the existing equipment is complex to install and maintain, the electric heating rod easily causes the phenomenon of overhigh local temperature, meanwhile, the temperature is difficult to control, and the electric heating rod is extremely easy to damage, so that the safety and the reliability of the equipment are reduced.
Aiming at the problems of large heat loss, low temperature rise speed, uneven heating and the like, the invention designs the heating device which has the advantages of high efficiency, energy conservation, safety, reliability, uniform heating, rapid temperature rise and convenient installation, improves the production efficiency of the battery hot-pressing formation and reduces the operation cost of equipment.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the purpose of the utility model is realized through following technical scheme:
the heating device comprises a clamp pressing plate and a heating chip, wherein the heating chip is arranged on the surface of the clamp pressing plate; the heating chip comprises a heating film and a conductive belt, and a conductive layer is arranged on the surface of the heating film; the conductive belt is arranged on the conductive layer and comprises a first conductive belt, a second conductive belt and a third conductive belt, the first conductive belt and the second conductive belt are oppositely arranged, and the third conductive belt is arranged between the first conductive belt and the second conductive belt; the tail end of the third conductive strip is connected with the second conductive strip, the front end of the third conductive strip is positioned on the inner side of the first conductive strip, and the conductive layer is provided with an insulating groove surrounding the third conductive strip; and the front end of the third conductive band and the first conductive band are both provided with connecting leads.
Preferably, the conducting layer is a metal oxide conducting layer with the thickness of 10-1000 nm. The metal oxide conductive layer contains ZnO x S (1-x) 、InO x S (1-x) 、Sn x In (1-x) O、Zn x Mg (1-x) O、Zn x Al (1-x) One or more of O, wherein x is more than 0 and less than 1; preferably, a metalAnd the metal oxide of the oxide conducting layer is sputtered on the surface of the substrate through a magnetron sputtering process.
Preferably, the conductive strips are copper strips or aluminum strips, and the thickness of the conductive strips is 5-1000 μm, and more preferably 50-200 μm.
Preferably, a silver paste layer is arranged between the conductive band and the conductive layer, and the thickness of the silver paste layer is 30-35 nm.
Preferably, the upper surface and the lower surface of the heating film are provided with insulating protective layers; the thickness of the insulating protective layer is 1-1000 μm, preferably 50-300 μm.
Preferably, the heating film and the insulating protective layer are made of insulating plastic materials such as PET, epoxy resin and the like.
Preferably, a heat insulation plate is further arranged between the clamp pressing plate and the heating chip.
Further, the heat insulation plate comprises a support plate, a heat insulation film and a sealing plate; the backup pad on be equipped with the recess that holds thermal-insulated membrane and shrouding, thermal-insulated membrane and shrouding are located the recess, and thermal-insulated membrane is located between backup pad and the shrouding.
Furthermore, the edge of the supporting plate is provided with a protruding part corresponding to the position of the connecting lead, the protruding part is provided with a through hole, and the connecting lead is fixed on the through hole through a pin.
Furthermore, a buffer film is arranged on the surface of the heating chip.
The battery hot-pressing formation equipment comprises the heating devices, a connecting arm and a driving device, wherein the heating devices are arranged oppositely, the connecting arm is used for being connected with a clamp pressing plate on the heating devices, and the driving device can drive the connecting arm to drive the two heating devices to move relatively.
The utility model discloses a heating device's battery hot pressing becomes equipment, the heat insulating board setting is between anchor clamps clamp plate and heating chip, and the thermal resistance between heat insulating board multiplicable heating chip and the anchor clamps clamp plate reduces calorific loss, reduces energy consumption, improves energy effective utilization. A buffer film is arranged between the heating chip and the battery to be aged, and the buffer film can compensate the flatness of the surface of the heating chip and ensure the uniformity of the stress of the contact surface of the battery. The surface of the buffer film can be treated to prevent the battery from being adhered to the surface of the buffer film after the processing is finished. The heat insulation plate, the heating chip and the buffer film are symmetrically distributed on two sides of the battery between the two clamp pressing plates, so that the two sides of the battery are uniformly heated.
The heating chip comprises a heating film, an upper insulating protective layer and a lower insulating protective layer, a conductive belt consisting of an aluminum strip or a copper strip is laid on the surface of the heating film, the uniform distribution of current of the heating film is facilitated, and a layer of silver paste is plated below the copper strip or the aluminum strip to improve the electric connectivity of the heating body. Two connecting leads are led out from the conductive belt and electrically connected with an external power supply. The conducting layer of heating film is provided with the insulating bath, and the insulating bath can prevent the electric current short circuit, improves the homogeneity of heating film current distribution, guarantees heating film temperature field evenly distributed.
The heat insulation plate is composed of a heat insulation film, a support plate and a sealing plate. The heat insulation film and the sealing plate are placed in the groove of the supporting plate, the heat insulation film is located between the supporting plate and the sealing plate, the heat insulation film is prevented from being extruded under pressure, and meanwhile the flatness of the heating chip is guaranteed. The supporting plate edge protruding portion is provided with two through holes, and two connecting leads led out by the conductive strips are fixed on the two through holes through pins, so that the connecting leads are prevented from being in poor contact due to accidental pulling and conductive strip separation, and the stability and the reliability of power supply are improved.
The clamp pressing plate can be made of materials with excellent mechanical properties or low cost, the heat-conducting property of the materials does not need to be considered, and the diversity of material selection is increased.
The utility model provides a current battery hot briquetting becomes equipment inhomogeneous that generates heat, the surface difference in temperature is big, and the programming rate is slow, and calorific loss is fast, and energy consumption is big, and shortcomings such as temperature control is not accurate have improved the stability and the reliability of equipment simultaneously, have reduced equipment fixing's complexity, have effectively solved a great deal of technological problem of this trade. Therefore, the utility model discloses a heating device's battery hot briquetting becomes equipment has following beneficial effect:
1) the heat insulation plate reduces the heat loss of the heating chip, improves the utilization rate of energy and reduces energy consumption;
2) the heating chip has high electric energy conversion rate and low resistivity, and can save external energy;
3) the heating chip belongs to surface heating, so that the temperature rise time is shortened, and the heating uniformity is ensured;
4) the material of the clamp pressing plate does not need to consider the heat conducting property, and can be replaced by a material with lower cost;
5) the surface temperature of the heating chip is controlled more accurately, and the actually measured temperature difference can be controlled to be +/-0.5 ℃;
6) the heating chip adopts a stacking technology, so that the assembly efficiency is improved;
7) the heating chip does not generate the phenomena of redness and scorching heat, has long service life, is not easy to damage, and improves the safety and the reliability of the equipment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without any creative effort.
Fig. 1 is an exploded view of a heating device of a thermal battery formation apparatus according to an embodiment of the present invention.
Fig. 2 is an exploded view of a heating chip and a heat insulating plate according to an embodiment of the present invention.
Fig. 3 is a structural diagram of a heating chip according to an embodiment of the present invention.
The labels in the figures illustrate:
1-a clamp pressing plate; 2-heating the chip; 3-a buffer film; 4-heat insulation plate; 5-a battery; 11-a heat-generating film; 12-a conductive band; 13-an insulating protective layer; 14-connecting leads; 15-silver paste layer; 16-a pin; 41-closing plate; 42-a heat-insulating film; 43-a support plate; 121-a first conductive strip; 122-a second conductive strip; 123-a third conductive strip; 124-insulating groove.
Detailed Description
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the attached drawings in the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the directions or positional relationships based on the directions or positional relationships shown in the drawings, or the directions or positional relationships that the products of the present invention are usually placed when used, and are only for the convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element indicated must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention.
The terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
The terms "parallel", "perpendicular", etc. do not require that the components be absolutely parallel or perpendicular, but may be slightly inclined. For example, "parallel" merely means that the directions are more parallel relative to "perpendicular," and does not mean that the structures are necessarily perfectly parallel, but may be slightly tilted.
The terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal, vertical or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
Furthermore, the terms "substantially", and the like are intended to indicate that the relative terms are not necessarily strictly required, but may have some deviation. For example: "substantially equal" does not mean absolute equality, but it is difficult to achieve absolute equality in actual production and operation, and certain deviations generally exist. Thus, in addition to absolute equality, "substantially equal" also includes the above-described case where there is some deviation. In this case, unless otherwise specified, terms such as "substantially", "essentially", and the like are used in a similar manner to those described above.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
A battery hot-pressing formation device comprises two heating devices which are oppositely arranged.
The heating apparatus shown in FIGS. 1 to 3 comprises a jig pressing plate 1, a heating chip 2, a buffer film 3, and a heat insulating plate 4. The fixture pressing plate 1, the heat insulation plate 4, the heating chip 2 and the buffer film 3 are sequentially stacked, so that the heat insulation plate 4, the heating chip 2 and the buffer film 3 are flatly paved and fixed on the fixture pressing plate 1.
The clamp pressing plate 1 can be made of a material with excellent mechanical property or low cost without considering the heat-conducting property of the material.
The heating chip 2 includes a heating film 11, a conductive tape 12, and an insulating protective layer 13. The surface of the heating film 11 is provided with a conductive layer, the conductive belt 12 is arranged on the conductive layer, and the upper surface and the lower surface of the heating film are both covered with an insulating protective layer 13. Specifically, the conductive strip 12 includes a first conductive strip 121, a second conductive strip 122, and a third conductive strip 123. The first conductive belt 121 and the second conductive belt 122 are arranged on two opposite edges of the heating film 11 in parallel, and the distance from the edges of the heating film 11 is 0-50 mm; the third conductive strip 123 is disposed between the first conductive strip and the second conductive strip, and the third conductive strip 123 is perpendicular to the second conductive strip 122. The end of the third conductive strip 123 is connected to the second conductive strip 122, and the front end is located inside the first conductive strip 121. In this embodiment, the middle position of the first conductive strip 121 is "U" shaped, and the front end of the third conductive strip 123 extends to the inner side of the "U" shaped position of the first conductive strip 121. The front end of the third conductive strip 123 and the U-shaped position of the first conductive strip are both provided with connecting leads 14. Two connecting leads 14 are led out from the conductive belt and can be electrically connected with an external power supply.
The conductive layer is provided with an insulating groove 124 surrounding the third conductive strip 123. The conducting layer of heating film sets up insulating groove 124, and the insulating groove can prevent the electric current short circuit, improves heating film current distribution's homogeneity, guarantees heating film 11 temperature field evenly distributed.
The conducting layer is a metal oxide conducting layer with the thickness of 10-1000 nm, and metal oxide of the metal oxide conducting layer is sputtered on the surface of the base material through a magnetron sputtering process. The metal oxide conductive layer contains ZnO x S (1-x) 、InO x S (1-x) 、Sn x In (1-x) O、Zn x Mg (1-x) O、Zn x Al (1-x) One or more of O, wherein x is more than 0 and less than 1. In this embodiment, the metal oxide conductive layer Zn x Al (1-x) O (x is in the range of 0.3-0.4) and has a thickness of 30-35 nm.
The conductive strips 12 are copper or aluminum strips having a thickness of 5-1000 μm, more preferably 50-200 μm. In this embodiment, the conductive tape 12 is a copper strip having a thickness of 200 μm and a width of 20 mm. A silver paste layer 15 is arranged between the conductive band 12 and the conductive layer, and the thickness of the silver paste layer 15 is 30-35 nm. The conductive belt composed of copper strips is laid on the surface of the heating film, so that the current of the heating film is uniformly distributed, and a layer of silver paste is plated below the copper strips to improve the electric connectivity of the heating body.
The heating film 11 and the insulating protective layer 13 are made of insulating plastic materials such as PET, epoxy resin and the like. The thickness of the insulating protective layer 13 is 1 to 1000. mu.m, preferably 50 to 300. mu.m. The thickness of the heat generating film 11 is 1 to 600. mu.m, preferably 10 to 200. mu.m. In this embodiment, the thickness of the insulating protective layer 13 is 70 μm, and the thickness of the heat generating film 11 is 150 μm.
The heat insulation plate 4 is positioned between the clamp pressing plate 1 and the heating chip 2, and comprises a supporting plate 43, a heat insulation film 42 and a sealing plate 41; the support plate 43 is provided with a recess for accommodating the heat insulating film 42 and the sealing plate 41, the heat insulating film 42 and the sealing plate 41 are located in the recess, and the heat insulating film 42 is located between the support plate 43 and the sealing plate 41. The heat insulation film and the seal plate are placed in the groove of the support plate, so that the heat insulation film is prevented from being extruded under pressure, and meanwhile, the flatness of the heating chip is guaranteed. The heat insulation plate is arranged between the clamp pressing plate and the heating chip, so that the heat resistance between the heating chip and the clamp pressing plate can be increased, the heat loss is reduced, the energy consumption is reduced, and the effective energy utilization rate is improved.
The edge of the supporting plate 43 is provided with a protrusion corresponding to the position of the connecting lead 14, the protrusion is provided with a through hole, and the connecting lead 14 is fixed on the through hole by the pin 16. Two connecting leads that the conductive band was drawn forth pass through the pin to be fixed on two through-holes, prevent connecting lead because the accident from dragging and the conductive band separation causes contact failure, improved the stability and the reliability of power supply.
The buffer film 3 is provided on the surface of the heating chip 2. The surface of the buffer film 3 may be treated to prevent the battery 5 from adhering to the surface of the buffer film 3 after the process is completed. A buffer film 3 is arranged between the heating chip 2 and the battery 5 to be aged, and the buffer film can compensate the flatness of the surface of the heating chip and ensure the uniformity of the stress of the contact surface of the battery.
Furthermore, the battery hot-pressing formation equipment further comprises a connecting arm and a driving device, wherein the connecting arm is used for connecting the clamp pressing plate on the heating device, and the driving device can drive the connecting arm to drive the two heating devices to move relatively. The heat insulation plate, the heating chip and the buffer film are symmetrically distributed on two sides of the battery between the two clamp pressing plates, so that the two sides of the battery are heated uniformly during hot pressing.
The utility model discloses a heating device's battery hot briquetting becomes equipment has following beneficial effect:
1) the heat insulation plate reduces the heat loss of the heating chip, improves the utilization rate of energy and reduces energy consumption;
2) the heating chip has high electric energy conversion rate and low resistivity, and can save external energy;
3) the heating chip belongs to surface heating, so that the temperature rise time is shortened, and the heating uniformity is ensured;
4) the material of the clamp pressing plate does not need to consider the heat-conducting property, and can be replaced by a material with lower cost;
5) the surface temperature of the heating chip is controlled more accurately, and the actually measured temperature difference can be controlled to be +/-0.5 ℃;
6) the heating chip adopts a stacking technology, so that the assembly efficiency is improved;
7) the heating chip does not generate red or scorching phenomena, has long service life, is not easy to damage, and improves the safety and the reliability of the equipment.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The heating device is characterized by comprising a clamp pressing plate and a heating chip, wherein the heating chip is arranged on the surface of the clamp pressing plate; the heating chip comprises a heating film and a conductive belt, and a conductive layer is arranged on the surface of the heating film; the conductive belt is arranged on the conductive layer and comprises a first conductive belt, a second conductive belt and a third conductive belt, the first conductive belt and the second conductive belt are oppositely arranged, and the third conductive belt is arranged between the first conductive belt and the second conductive belt; the tail end of the third conductive strip is connected with the second conductive strip, the front end of the third conductive strip is positioned on the inner side of the first conductive strip, and the conductive layer is provided with an insulating groove surrounding the third conductive strip; and the front end of the third conductive band and the first conductive band are both provided with connecting leads.
2. The heating device according to claim 1, wherein the conductive layer is a metal oxide conductive layer having a thickness of 10 to 1000 nm.
3. The heating apparatus as claimed in claim 2, wherein the conductive strip is a copper strip or an aluminum strip having a thickness of 5 to 1000 μm.
4. The heating apparatus as claimed in claim 3, wherein a silver paste layer is provided between the conductive tape and the conductive layer, and the thickness of the silver paste layer is 30-35 nm.
5. The heating apparatus according to claim 4, wherein upper and lower surfaces of the heat generating film are provided with insulating protective layers.
6. The heating apparatus as claimed in any one of claims 1 to 5, wherein a heat insulating plate is further provided between the jig pressing plate and the heating core.
7. The heating apparatus as claimed in claim 6, wherein the heat insulating plate comprises a support plate, a heat insulating film and a sealing plate; the backup pad on be equipped with the recess that holds thermal-insulated membrane and shrouding, thermal-insulated membrane and shrouding are located the recess, and thermal-insulated membrane is located between backup pad and the shrouding.
8. The heating apparatus as claimed in claim 7, wherein the supporting plate has a protrusion formed at an edge thereof corresponding to the connecting lead, the protrusion having a through hole, and the connecting lead being fixed to the through hole by a pin.
9. The heating device according to claim 6, wherein a surface of the heating chip is provided with a buffer film.
10. A battery thermal compression molding apparatus comprising two oppositely disposed heating devices according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221082640.8U CN217485546U (en) | 2022-05-07 | 2022-05-07 | Heating device and battery hot-pressing formation equipment applying same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221082640.8U CN217485546U (en) | 2022-05-07 | 2022-05-07 | Heating device and battery hot-pressing formation equipment applying same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217485546U true CN217485546U (en) | 2022-09-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221082640.8U Active CN217485546U (en) | 2022-05-07 | 2022-05-07 | Heating device and battery hot-pressing formation equipment applying same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217485546U (en) |
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2022
- 2022-05-07 CN CN202221082640.8U patent/CN217485546U/en active Active
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