A heating system for passivation coating equipment and passivation coating equipment

Abstract

The application relates to the field of passivation coating equipment, and provides a heating system for a passivation coating equipment and the passivation coating equipment. The heating system comprises a first heating assembly and a second heating assembly, the first heating assembly and the second heating assembly are coaxially arranged in a reaction chamber, the first heating assembly is located on the outer side of a plurality of material boxes, and the second heating assembly is located on the inner side of the plurality of material boxes. The passivation coating equipment comprises a reaction chamber, a bottom disc, a heating system and a plurality of material boxes, a plurality of battery pieces with two oppositely arranged cutting surfaces are arranged in the material boxes. The first heating assembly and the second heating assembly of the application are arranged on the inner and outer sides of the material boxes, a bidirectional radiation heating field is formed, the original temperature gradient of 'high on the outside and low on the inside' is completely broken, the temperature is uniformly distributed from the outer edge to the central area of the material box, and then the cutting surfaces of all the battery pieces are ensured to be at the same process temperature, so that the film thickness difference, stress cracks or inconsistent passivation effect caused by the temperature difference are avoided.

Description

Technical Field

[0001] This utility model relates to the field of passivation coating equipment, and further to a heating system for passivation coating equipment and passivation coating equipment. Background Technology

[0002] Existing passivation coating equipment is limited by its single-sided coating capacity, resulting in low equipment utilization and unit output. To double the effective coating area per unit time, double-sided coating has become a key breakthrough direction. However, existing heating systems rely solely on lamps on the inner wall of the reaction chamber for heating, resulting in a significant gradient in the thermal field distribution, with the temperature inside the chamber decreasing progressively from the outer edge to the center. This uneven temperature within the chamber directly leads to an imbalance in the temperature field of the solar cell film formation, ultimately manifesting as a deterioration in the uniformity of the coating layer both inside and outside the material container. Utility Model Content

[0003] To address the aforementioned technical problems, the purpose of this utility model is to provide a heating system and passivation coating equipment for passivation coating equipment. The first heating component and the second heating component are arranged around the inner and outer sides of the material box to form a bidirectional radiative heating field, which completely breaks the original temperature gradient of "high outside and low inside", and realizes a uniform temperature distribution from the outer edge of the material box to the central area. This ensures that the cut surfaces of all battery cells are at the same process temperature, avoiding film thickness differences, stress cracks, or inconsistent passivation effects caused by temperature differences.

[0004] To achieve the above objectives, this utility model provides a heating system for a passivation coating equipment. The passivation coating equipment includes a reaction chamber, a chassis, and several material boxes. The chassis is coaxially disposed inside the reaction chamber, and several material boxes are spaced apart on the chassis in a circumferential direction. Each material box contains several battery cells with cut surfaces. The heating system includes a first heating component and a second heating component.

[0005] The first heating component and the second heating component are coaxially disposed inside the reaction chamber, with the first heating component located on the outer side of the plurality of material boxes and the second heating component located on the inner side of the plurality of material boxes.

[0006] In some embodiments, the first heating component is coaxially disposed between the inner side wall of the reaction chamber and the material box, and the heating surface of the first heating component faces the end of the material box away from the central axis of the chassis;

[0007] The second heating component is coaxially disposed in the central area of ​​the chassis, and the heating surface of the second heating component faces the end of the material box near the central axis of the chassis.

[0008] In some embodiments, both the first heating component and the second heating component include a plurality of infrared short-wave lamps, which are arranged sequentially at intervals around the circumferential direction of the chassis, and all of the infrared short-wave lamps extend along the axial direction of the chassis.

[0009] In some embodiments, both the first heating assembly and the second heating assembly further include reflectors, which are coaxially disposed inside the reaction chamber and located opposite each other on the inner and outer sides of the material box, with the infrared short-wave lamps positioned between the two reflectors.

[0010] In some embodiments, a temperature sensor is also included, which is disposed on the inner wall of the reaction chamber and located in the gap between adjacent material boxes.

[0011] According to another aspect of this application, a passivation coating apparatus is further provided, including any of the heating systems, reaction chambers, chassis, and a plurality of material boxes as described in the preferred embodiments above; the reaction chamber includes a cavity and a cover plate, the cover plate being adapted to cover the cavity, a first heating component of the heating system being installed on the inner wall of the cavity or the outer edge of the bottom of the cover plate, and a second heating component of the heating system being installed in the central region of the bottom of the cover plate or the central region of the chassis.

[0012] In some embodiments, the two cut surfaces of the battery cells inside the cassette are located opposite each other on both sides of the chassis in the circumferential direction and form a coated surface, the coated surface being located on both ends of the cassette in the circumferential direction of the chassis.

[0013] In some embodiments, the two cut surfaces of the battery cells inside the cassette are located opposite each other on both sides of the chassis in the radial direction and form a coated surface, the coated surface being located on both ends of the cassette in the radial direction of the chassis.

[0014] Compared with the prior art, the heating system and passivation coating equipment provided by this utility model have at least one of the following beneficial effects:

[0015] 1. The first heating component and the second heating component are arranged around the inner and outer sides of the material box to form a bidirectional radiative heating field, which completely breaks the original temperature gradient of "high outside and low inside", and realizes the uniform temperature distribution from the outer edge of the material box to the center area. This ensures that the cut surfaces of all battery cells are at the same process temperature, and avoids film thickness differences, stress cracks or inconsistent passivation effects caused by temperature differences.

[0016] 2. Several infrared short-wave lamps are arranged around the chassis in sequence to form a highly symmetrical and uniform ring heating array; each infrared short-wave lamp extends along the axial direction of the chassis to ensure that heat can be radiated evenly along the height of the material box, so that the first heating component and the second heating component can form an all-round, no-dead-angle heat radiation coverage on both the inner and outer sides of the material box.

[0017] 3. The reflector not only effectively enhances the thermal radiation efficiency of the infrared short-wave lamps, ensuring that heat can be accurately and centrally transferred to all parts of the material box, but also forms an efficient thermal reflection circuit in the reaction chamber, reducing the ineffective heat loss in the chamber and further improving the energy utilization and temperature uniformity of the entire heating system.

[0018] 4. The first heating component and the second heating component mainly heat the non-coated surface of the material box, so that the coated surface of the material box can be protected from direct heat radiation, thereby avoiding inconsistent coating quality or damage to the coating layer due to temperature fluctuations. Attached Figure Description

[0019] The preferred embodiments will be described below in a clear and easy-to-understand manner, in conjunction with the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages and implementation methods of this utility model.

[0020] Figure 1 This is a structural diagram of the heating system.

[0021] Explanation of icon numbers:

[0022] Heating system 1, first heating component 11, infrared shortwave lamp tube 111, reflector 112, second heating component 12, material box 2, coated surface 21, non-coated surface 22, chassis 3. Detailed Implementation

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0024] To keep the drawings concise, each figure only schematically shows the parts relevant to the utility model, and these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of the components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0025] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0026] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] Furthermore, in the description of this application, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. It should be noted that the above embodiments can be freely combined as needed. The above are merely preferred embodiments of this utility model. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

[0028] refer to Figure 1 This utility model provides a heating system 1 for a passivation coating equipment. The heating system 1 includes a first heating component 11 and a second heating component 12. The first heating component 11 and the second heating component 12 are coaxially arranged inside the reaction chamber, and the first heating component 11 is located on the outer side of a plurality of material boxes 2, while the second heating component 12 is located on the inner side of a plurality of material boxes 2.

[0029] In this embodiment, the first heating component 11 and the second heating component 12 are arranged around the inner and outer sides of the material box 2 to form a bidirectional radiative heating field, which completely breaks the original temperature gradient of "high outside and low inside", and realizes the uniform temperature distribution from the outer edge of the material box 2 to the center area. This ensures that the cut surfaces of all battery cells are at the same process temperature, and avoids film thickness differences, stress cracks or inconsistent passivation effects caused by temperature differences.

[0030] Specifically, the passivation coating equipment includes a reaction chamber, a chassis 3, and several material boxes 2. The chassis 3 is coaxially arranged inside the reaction chamber and is suitable for rotational movement. The material boxes 2 are spaced apart around the chassis 3 in a circumferential direction. Each material box 2 contains several solar cells with cut surfaces. The position and number of cut surfaces will not be further elaborated here. Preferably, the solar cell has two oppositely arranged cut surfaces, so that the double cut surfaces of all solar cells are located on opposite sides and are simultaneously exposed to the coating environment. Compared with single-sided coating, double-sided coating doubles the effective coating area 21 per unit time, increases the utilization rate of the passivation coating equipment by more than 50%, eliminates the need for flipping or secondary coating, shortens the production cycle, and directly increases the unit capacity.

[0031] More specifically, the first heating component 11 is coaxially disposed between the inner wall of the reaction chamber and the material box 2, with its heating surface facing the end of the material box 2 away from the central axis of the chassis 3. A ring-shaped thermal radiation band is formed by uniformly distributed infrared short-wave lamps 111, ensuring stable and efficient heat transfer to the outer area of ​​the material box 2. The second heating component 12 is coaxially disposed in the central area of ​​the chassis 3, with its heating surface facing the end of the material box 2 closest to the central axis of the chassis 3. The second heating component 12 radiates heat in all directions, allowing heat to penetrate evenly into the inner area of ​​the material box 2. The first heating component 11 and the second heating component 12 are distributed around the outer and inner sides of the material box 2, jointly constructing a bidirectional radiative heating field. This fundamentally overturns the "high outside, low inside" temperature distribution gradient caused by traditional heating methods, achieving a uniform temperature distribution from the outer edge of the material box 2 to its central area. Compared with traditional unidirectional heating methods, this heating system 1 not only achieves uniform temperature distribution but also significantly improves heating efficiency. Through bidirectional radiant heating, heat can simultaneously converge from both the inner and outer sides to the central area of ​​material box 2, shortening the time for the battery cells to reach the process temperature and improving production efficiency. In actual operation, all cut surfaces of the battery cells can be in a highly consistent process temperature environment, thereby effectively avoiding a series of negative consequences caused by temperature differences, such as differences in film thickness, stress cracks, and inconsistent passivation effects. This ensures the high-quality and stable execution of the passivation coating process for the battery cells, which is of paramount importance for improving the overall performance of the battery cells and the production yield.

[0032] It is worth noting that the power and temperature of the first heating component 11 and the second heating component 12 can be independently adjusted, which can flexibly compensate for the difference in heat loss between the edge and center areas of the reaction chamber and adapt to different process formulations or changes in the amount of feed. Of course, an independent temperature control system is required in the reaction chamber at this time.

[0033] Furthermore, both the first heating component 11 and the second heating component 12 include a plurality of infrared short-wave lamps 111, which are arranged sequentially at intervals around the chassis 3 in the circumferential direction, and the plurality of infrared short-wave lamps 111 extend along the axial direction of the chassis 3.

[0034] In this embodiment, several infrared short-wave lamps 111 are arranged around the chassis 3 in sequence to form a highly symmetrical and uniform annular heating array; each infrared short-wave lamp 111 extends along the axial direction of the chassis 3 to ensure that heat can be radiated uniformly along the height direction of the material box 2, so that the first heating component 11 and the second heating component 12 can form an all-round, no-dead-angle heat radiation coverage on both the inner and outer sides of the material box 2.

[0035] Specifically, infrared short-wave lamps 111 are arranged sequentially around the circumference of the chassis 3, forming a symmetrical and uniform annular heating array. The infrared short-wave lamps 111 in the first heating assembly 11 and the second heating assembly 12 are evenly distributed at predetermined intervals, ensuring that heat can uniformly cover the inner and outer sides of the material box 2. Furthermore, each infrared short-wave lamp 111 extends along the axial direction of the chassis 3, ensuring that heat can be uniformly radiated along the height of the material box 2. Specifically, when the infrared short-wave lamps 111 are energized and generate heat, the heat generated is not only uniformly distributed circumferentially but also forms a continuous thermal radiation band in the axial direction, thus achieving uniform heating across the entire height range of the material box 2. As heating elements, the infrared short-wave lamps 111 have the characteristics of rapid heating and efficient radiation. They can reach the set process temperature in a very short time, meeting the requirements for rapid temperature response on high-speed production lines. Simultaneously, the spectral characteristics of the infrared short-wave lamps 111 concentrate the radiated heat mainly in the band with the highest absorption efficiency of the solar cells, thereby achieving a heating effect with high energy utilization and high thermal efficiency. Furthermore, by precisely controlling the power of the infrared short-wave lamp 111, the temperature distribution of the heating field can be flexibly adjusted to ensure uniform temperature from the outer edge of the material box 2 to the center area, providing a stable and uniform thermal environment for the double-sidewall passivation coating process of the battery cells. It is worth noting that the first heating component 11 and the second heating component 12 can also be other heating units such as ceramic heating plates, which is readily apparent to those skilled in the art, and this application does not further limit their use.

[0036] Preferably, both the first heating component 11 and the second heating component 12 further include a reflector plate 112. The two reflector plates 112 are coaxially arranged inside the reaction chamber and are located opposite each other on the inner and outer sides of the material box 2. The infrared short-wave lamp tube 111 is located between the two reflector plates 112.

[0037] In this embodiment, the reflector 112 not only effectively enhances the thermal radiation efficiency of the infrared shortwave lamp 111, ensuring that heat can be accurately and centrally transferred to various parts of the material box 2, but also forms an efficient thermal reflection circuit in the reaction chamber, reducing the ineffective heat loss in the chamber and further improving the energy utilization rate and temperature uniformity of the entire heating system 1.

[0038] Specifically, two reflectors 112 are coaxially arranged inside the reaction chamber, and are respectively located on the outer and inner sides of the material box 2. Infrared short-wave lamps 111 are located opposite each other within the corresponding reflector 112 internal space; that is, the infrared short-wave lamp 111 of the first heating component 11 is located inside the reflector 112 on the outer ring of the chassis 3, and the infrared short-wave lamp 111 of the second heating component 12 is located inside the reflector 112 on the inner ring of the chassis 3. The reflectors 112 are made of a high-reflectivity metal material, such as aluminum, silver, or their alloys, and their surfaces are finely polished, exhibiting a mirror-like smooth texture with a reflectivity of over 90%. The shape of the reflectors 112 is designed as an arc-shaped structure matching the outer shape of the reaction chamber, which can reflect the heat emitted by the infrared short-wave lamps 111 with high precision and concentrate it towards the corresponding outer and inner areas of the material box 2, allowing the heat to be accurately and concentratedly transferred to various parts of the material box 2, forming an efficient and uniform thermal radiation field. In actual operation, when the infrared shortwave lamp 111 is powered on and heats up, the heat it generates is first radiated outwards. The reflector 112 located on the outside of the lamp reflects some of the heat that was originally scattered outwards back, refocusing it on the material box 2 area. This reflection not only enhances the thermal radiation efficiency of the lamp, but also reduces the ineffective heat loss in other areas of the reaction chamber, thereby improving the energy utilization rate of the entire heating system 1.

[0039] It is worth noting that, in general, the introduction of the reflector 112 not only enhances the heating efficiency of the infrared short-wave lamps 111, but also optimizes the thermal field distribution of the entire heating system 1, providing an efficient, uniform, and stable thermal environment for the double-sidewall passivation coating process of the solar cells. By precisely adjusting the shape and angle of the reflector 112 and the arrangement of the infrared short-wave lamps 111, a uniform distribution of heat can be achieved around the material box 2, ensuring a uniform temperature from the outer edge to the center of the material box 2.

[0040] Preferably, the system also includes a temperature sensor, which is disposed on the inner wall of the reaction chamber and positioned relative to the gap between adjacent material boxes 2. The temperature sensor can monitor the temperature change in the area between adjacent material boxes 2 in real time. The temperature sensor is connected to the control system of the heating components and, through a feedback mechanism, precisely adjusts the heating power of the first heating component 11 and the second heating component 12 to ensure the uniformity and stability of the temperature throughout the reaction chamber. This allows the temperature sensor to avoid direct heat obstruction by the material boxes 2, and more accurately monitor the actual temperature around the material boxes 2, providing reliable data support for the dynamic adjustment of the heating system 1. This further optimizes the uniformity of the temperature field and ensures that the solar cells in each material box 2 are in an ideal process temperature environment.

[0041] Furthermore, this application provides a passivation coating apparatus, including a heating system 1, a reaction chamber, a chassis 3, and a plurality of material boxes 2 as described in any of the above embodiments; the reaction chamber includes a cavity and a cover plate, the cover plate being adapted to cover the cavity, the first heating component 11 of the heating system 1 being installed on the inner side wall of the cavity or the outer edge of the bottom of the cover plate, and the second heating component 12 of the heating system 1 being installed in the central area of ​​the bottom of the cover plate or the central area of ​​the chassis 3.

[0042] In this embodiment, the first heating component 11 is installed on the inner side wall of the cavity or the bottom outer edge of the cover plate, while the second heating component 12 is installed in the bottom center area of ​​the cover plate or the center area of ​​the chassis 3. This not only ensures the high integration and compactness of the heating system 1 with the reaction chamber, but also enables the heating system 1 to flexibly adjust the heating position and method according to different process requirements.

[0043] Specifically, the reaction chamber consists of a cavity and a cover plate. The cover plate can be precisely fitted onto the cavity to form a sealed processing environment. A spray system is also provided at the top of the reaction chamber. The reaction gas sprayed by the spray system is parallel to the coating on the material box 2, allowing the reaction gas to reach each coating surface 21 evenly, thereby achieving a uniform film thickness distribution. The first heating component 11 is located on the inner wall of the cavity or the outer edge of the bottom of the cover plate, effectively heating the outer area of ​​the material box 2; while the second heating component 12 is located in the center area of ​​the bottom of the cover plate or the center area of ​​the chassis 3, precisely providing heat to the inner area of ​​the material box 2. This allows heat to act simultaneously from both the inner and outer sides of the material box 2, forming a bidirectional radiative heating field, thereby breaking the traditional temperature gradient and ensuring that the temperature of the material box 2 is uniform from the outer edge to the center.

[0044] It is worth noting that the rotating part of the chassis 3 can be either annular or circular, allowing the second heating component 12 to be fixed to either the non-rotating part or the rotating part of the chassis 3, rotating with the chassis 3. This application does not further limit this. Simultaneously, the first heating component 1 can also be located at the outer edge of the chassis 3, rotating with the chassis 3 and corresponding to the first heating component 11. Furthermore, to improve the reliability and maintenance convenience of the passivation coating equipment, the connection points between the heating system 1 and the reaction chamber can be designed for easy disassembly and installation. For example, the first heating component 11 can be fixed to the inner wall of the chamber or the outer edge of the bottom of the cover plate via quick-connect fittings, while the second heating component 12 can be installed in the central area of ​​the bottom of the cover plate or the central area of ​​the chassis 3 via a modular interface. This not only facilitates daily maintenance and component replacement of the passivation coating equipment but also ensures that the heating system 1 is not damaged during installation and disassembly, extending the equipment's service life. The quick-connect fittings and modular interfaces will not be further elaborated upon in this application.

[0045] Preferably, the two cut surfaces of the battery cells inside the material box 2 are located opposite each other on both sides of the chassis 3 in the circumferential direction and form a coating surface 21. The coating surface 21 is located on both ends of the material box 2 in the circumferential direction of the chassis 3.

[0046] In this embodiment, the first heating component 11 and the second heating component 12 mainly heat the non-coated surface 22 of the material box 2, so that the coated surface 21 of the material box 2 can be protected from direct heat radiation, thereby avoiding inconsistent coating quality or damage to the coating layer due to temperature fluctuations.

[0047] Specifically, the two cut surfaces of the battery cell are located on opposite sides of the chassis 3 in the circumferential direction. These two cut surfaces are the coating surfaces 21, with the coating surfaces 21 positioned on adjacent end faces of the material box 2 on both sides of the chassis 3 in the circumferential direction. That is, the coating surfaces 21 are parallel to the radial direction of the chassis 3, while the end faces of the material box 2 in the radial direction of the chassis 3 form non-coated surfaces 22. Since the heating system 1 is located at both ends of the material box 2 in the radial direction of the chassis 3, the heating surface of the heating system 1 faces directly towards the non-coated surface 22 of the material box 2 and intersects with the extension line of the coating surface 21 of the material box 2. In other words, the heating surface of the heating system 1 does not directly heat the coating surface 21 of the material box 2, thus avoiding direct thermal interference or damage to the coating surface 21 caused by the heating system 1. Furthermore, during the heating process, by uniformly heating the non-coated surface 22 of the material box 2, it is ensured that the heat can be evenly transferred from the non-coated area of ​​the material box 2 to the coated area of ​​the material box 2, thereby avoiding direct thermal impact on the coated surface 21. This makes the temperature change of the cut surface of the battery cell in the reaction chamber more uniform. At this time, the cut surface of the entire battery cell can maintain a stable temperature state during the coating process. This helps to improve the adhesion and uniformity of the coating layer, reduce the internal stress caused by temperature difference, and thus improve the mechanical strength and optical performance of the battery cell.

[0048] It is worth noting that the two cut surfaces of the battery cells inside the material box 2 are located opposite each other on both sides of the chassis 3 in the radial direction and form a coating surface 21. The coating surface 21 is located on both ends of the material box 2 in the radial direction of the chassis 3. Compared with the above embodiment, in this embodiment, the first heating component 11 and the second heating component 12 directly heat the coating surface 21 of the material box 2, which is also within the scope of protection of this application.

[0049] It should be noted that the above embodiments can be freely combined as needed. The above are merely preferred embodiments of this utility model. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A heating system for a passivation coating apparatus, the passivation coating apparatus comprising a reaction chamber, a chassis, and a plurality of material boxes, the chassis being coaxially disposed inside the reaction chamber, the plurality of material boxes being spaced apart from the chassis in a circumferential direction, and the material boxes containing a plurality of battery cells with cut surfaces, characterized in that, The heating system includes a first heating component and a second heating component; The first heating component and the second heating component are coaxially disposed inside the reaction chamber, with the first heating component located on the outer side of the plurality of material boxes and the second heating component located on the inner side of the plurality of material boxes.

2. The heating system for a passivation coating equipment according to claim 1, characterized in that, The first heating component is coaxially disposed between the inner side wall of the reaction chamber and the material box, and the heating surface of the first heating component faces the end of the material box away from the central axis of the chassis; The second heating component is coaxially disposed in the central area of ​​the chassis, and the heating surface of the second heating component faces the end of the material box near the central axis of the chassis.

3. The heating system for a passivation coating equipment according to claim 2, characterized in that, Both the first heating component and the second heating component include a plurality of infrared short-wave lamps, which are arranged sequentially at intervals around the circumferential direction of the chassis, and all of the infrared short-wave lamps extend along the axial direction of the chassis.

4. The heating system for a passivation coating equipment according to claim 3, characterized in that, Both the first heating component and the second heating component further include a reflector plate. The two reflector plates are coaxially arranged inside the reaction chamber and are located opposite each other on the inner and outer sides of the material box. The infrared short-wave lamp tube is located between the two reflector plates.

5. A heating system for a passivation coating equipment according to claim 1, characterized in that, It also includes a temperature sensor, which is disposed on the inner wall of the reaction chamber and located in the gap between adjacent material boxes.

6. A passivation coating equipment, characterized in that, The invention includes a heating system, a reaction chamber, a chassis, and a plurality of material boxes as described in any one of claims 1-5; the reaction chamber includes a cavity and a cover plate, the cover plate being adapted to cover the cavity, a first heating component of the heating system being installed on the inner side wall of the cavity or the outer edge of the bottom of the cover plate, and a second heating component of the heating system being installed in the central region of the bottom of the cover plate or the central region of the chassis.

7. The passivation coating equipment according to claim 6, characterized in that, The two cut surfaces of the battery cells inside the material box are located opposite each other on both sides of the chassis in the circumferential direction and form a coated surface. The coated surface is located on both ends of the material box in the circumferential direction of the chassis.

8. The passivation coating equipment according to claim 6, characterized in that, The two cut surfaces of the battery cells inside the material box are located opposite each other on both sides of the chassis in the radial direction and form a coated surface. The coated surface is located on both ends of the material box in the radial direction of the chassis.

Images