A passivation crystal boat and a passivation device

Abstract

The present invention provides a passivation crystal boat and a passivation device, which belong to the technical field of passivation equipment and are used for passivating the surface to be passivated of a battery cell. The passivation crystal boat comprises: a boat support, the accommodating cavity of the boat support comprises: a passivation channel for passing the passivation airflow; a small boat accommodating area, wherein a plurality of small boat accommodating areas are provided; the plurality of small boat accommodating areas are arranged on the outside of the passivation channel along the movement route of the passivation airflow, and the plurality of small boat accommodating areas surround the passivation channel; and a small boat, wherein the small boat is arranged in the small boat accommodating area; the small boat comprises a boat body, and the boat body is provided with a battery cell compartment with an open end face; wherein each small boat accommodating area accommodates a plurality of small boats, the open end faces of the small boats in all the small boat accommodating areas face the passivation channel, and the surface to be passivated is located at the open end face, so that the passivation airflow of the passivation channel acts on the surface to be passivated of the battery cell; and the technical effect of uniform passivation of batches of battery cells is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of passivation equipment, and in particular to a passivation crystal boat and a passivation device. Background Art

[0002] To reduce cell production costs, the photovoltaic industry continues to move toward larger silicon wafers. However, this continued increase in cell size leads to increased bus resistance in photovoltaic modules, resulting in significant heat loss within the cells and a reduction in overall module efficiency. Consequently, large silicon wafer half-cell modules are increasingly being adopted within the industry. Cutting cells into halves or thirds before assembly reduces the internal resistance of individual wafers and improves overall module efficiency.

[0003] After laser scribing screen-printed solar cells, the cut surfaces require passivation to prevent electrons from the PN junction region from migrating to the cut surface, creating load carriers and reducing power generation. Currently, there is no mature equipment for passivating cut surfaces in the industry. Conventional wafer boats are typically used to hold the cells to be passivated, and passivation is typically performed using ALD or CVD processes. However, this can easily lead to uneven passivation across the cells.

[0004] Therefore, the technical problem of the prior art is: how to improve the passivation uniformity of the battery cell. Summary of the Invention

[0005] The embodiments of the present application provide a passivation wafer boat and a passivation device, which solve the technical problem of how to improve the passivation uniformity of battery cells in the prior art, thereby achieving the technical effect of uniform passivation of battery cells.

[0006] 14. The invention relates to a method of manufacturing a passivation wafer boat according to claim 13, wherein the passivation wafer boat comprises a boat support, wherein the boat support comprises a receiving cavity; the receiving cavity comprises a passivation channel for passing a passivation gas flow; a boat receiving area, wherein the boat receiving area is provided with a plurality of boat receiving areas; the boat receiving areas are provided with a plurality of boat receiving areas; the plurality of boat receiving areas are provided on the outside of the passivation channel along the movement route of the passivation gas flow, and the plurality of boat receiving areas surround the passivation channel; and a boat, wherein the boat is provided in the boat receiving area; the boat comprises a boat body, the boat is provided with a battery cell compartment with an opening, and the battery cell compartment is used to accommodate battery cells; wherein each of the boat receiving areas accommodates one or more boats, the openings of the boats in all the boat receiving areas face the passivation channel, and the battery cell surface to be passivated is located at the opening, so that the passivation gas flow of the passivation channel acts on the battery cell surface to be passivated.

[0007] Preferably, the depth dimension of the battery cell compartment from the opening inward is ≥ the dimension L1 from the surface of the battery cell to be passivated to the surface opposite to the surface to be passivated, so that the surface to be passivated of the battery cell accommodated in the battery cell compartment is flush or substantially flush with the end face of the opening; the width dimension of the opening is ≥ the width dimension L2 of the surface of the battery cell to be passivated, and the width dimension of the opening is ≤ the width dimension L2+2mm of the surface of the battery cell to be passivated.

[0008] Preferably, two boat accommodating areas are provided, and the two boat accommodating areas are arranged on opposite sides of the passivation channel.

[0009] Preferably, the boat is provided with an open end surface forming the opening, and the open end surfaces of the plurality of boats located in the same boat accommodating area are in the same plane.

[0010] Preferably, adjacent boats are arranged in close proximity to each other.

[0011] Preferably, the boat support includes a skeleton, and the interior of the skeleton includes a boat accommodating area and a passivation channel; the side of the skeleton opposite to the passivation channel is the skeleton end face; the boat bodies between adjacent boats maintain a gap, wherein part of the skeleton is located in the gap between adjacent boat bodies, and the gap is blocked by the skeleton, and the skeleton end face of the skeleton is flush or substantially flush with the open end faces of the two adjacent boats where the openings are located.

[0012] Preferably, the boat further includes an airflow baffle, which is connected to the outside of the boat body, and the boat body is provided with the battery cell compartment; a gap is maintained between the boat bodies of adjacent boats, wherein the airflow baffle is used to seal the gap between adjacent boat bodies, and the baffle end face of the airflow baffle is flush or substantially flush with the open end faces of the two adjacent boats where the openings are located.

[0013] Preferably, the boat support includes a frame, and the interior of the frame includes a boat accommodating area and a passivation channel; the frame has a frame end face opposite to the passivation channel; the boat also includes an airflow baffle, which is connected to the outside of the battery cell compartment; a gap is maintained between adjacent boats, wherein part of the frame and the airflow baffle is arranged in the gap between adjacent boats, and the frame end face of the frame, the baffle end face of the airflow baffle and the open end faces of two adjacent boats are flush or basically flush, and the above-mentioned gap is blocked by part of the frame and the airflow baffle.

[0014] Preferably, the crystal boat includes a skeleton, which includes: a skeleton body for constructing the passivation channel and the boat accommodating area; a reinforcing plate, which is a plate body with interactive holes, and the reinforcing plate is located in the passivation channel, and the reinforcing plate is arranged along the basic movement direction of the passivation airflow; the reinforcing plate and the skeleton body are connected so that the parts of the skeleton body at two positions of the passivation channel constitute a whole; wherein, the interactive holes of the reinforcing plate correspond to the open end face of the opening on the boat, and the interactive hole side wall relative to the open end face is flush or substantially flush with the open end face.

[0015] Preferably, the boat also includes a pressure plate unit, which includes: a pressure plate, which is movably arranged in the battery cell compartment, and the pressure plate and the boat body together constitute the outline of the opening; an elastic member, which is connected or abutted between the pressure plate and the boat body; a pull plate, which is located on the outside of the battery cell compartment; and a pull rod, the two ends of the pull rod are respectively connected to the pressure plate and the pull plate; wherein the outline size of the opening is adjustable through the pull plate and the elastic member.

[0016] Preferably, the opening is located on the front of the boat body, and the pull plate is located on the back of the boat body; or, the opening is located on the front of the boat body, and the pull plate is located on the side of the boat body, and the pull plate protrudes from the side of the boat body toward the passivation channel; an airflow baffle or a boat support is provided between the pull plate and the passivation channel to limit the passivation airflow from moving toward the pull plate.

[0017] Preferably, the boat and the boat support are respectively provided with a positioning hole and a connecting pin, and the positioning hole and the connecting pin are adapted to allow the boat and the boat support to be detachably fixed.

[0018] A passivation device comprises: a shell having a working space inside; a passivation crystal boat arranged in the working space; an air intake assembly arranged in the working space; and an air extraction assembly arranged in the working space; wherein the air intake assembly and the air extraction assembly are respectively arranged on both sides of the movement route of the passivation airflow in the passivation channel, and the passivation airflow moves along the passivation channel through the air intake assembly and the air extraction assembly.

[0019] The above one or more technical solutions in the embodiments of the present application have at least one or more of the following technical effects:

[0020] 1. In this application, a plurality of boat-holding areas surround a passivation channel, with the surfaces of the cells in the boats to be passivated all facing the passivation channel. This ensures that the boats are evenly arranged relative to the passivation channel, and the surfaces of the cells in the boats to be passivated are evenly arranged relative to the passivation channel. This allows the passivation gas in the passivation channel to flow in multiple directions, uniformly passivating the cells, enabling batch passivation of cells within a single passivation channel. This solves the prior art problem of improving cell passivation uniformity and achieves the technical effect of uniform passivation of cells in batches. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic side view of a cross-sectional structure of a flow uniforming device in this application;

[0022] Figure 2 for Figure 1 Schematic diagram of the inner cavity structure of the boat support part;

[0023] Figure 3 This is a schematic diagram of a cross-sectional structure of a flow uniforming device in the present application;

[0024] Figure 4 This is a schematic diagram of the structure of the air intake plate in this application from a top view;

[0025] Figure 5 This is a schematic diagram of the structure of the exhaust plate in this application from a top view;

[0026] Figure 6 This is a schematic diagram of the main cross-sectional structure between the air extraction plate and the bottom of the boat support in this application.

[0027] Figure 7 This is a schematic diagram of the axial lateral structure of the boat and the boat support after they are combined in this application;

[0028] Figure 8 An exploded view of the boat relative to the boat support in this application;

[0029] Figure 9 An exploded view of a boat containing silicon wafers in this application;

[0030] Figure 10 for Figure 7 Enlarged view of point A in the middle;

[0031] Figure 11 for Figure 7 Enlarged view of point B in the middle;

[0032] Figure 12 It is a schematic diagram of the side view of another type of small boat relative to the boat support.

[0033] Reference numerals: W, cell; WC, surface to be passivated; 100, housing; 11, working space; 200, air intake assembly; 21, air intake pipe; 22, air intake plate; 221, air intake area; 222, isolation area; 223, partition; 23, guide plate; 300, exhaust assembly; 31, exhaust pipe; 32, exhaust plate; 321, first exhaust area; 3211, first exhaust hole; 3212 , restricted area; 322, second air extraction area; 3221, second air extraction hole; 400, boat support; 41, frame; 411, frame body; 4111, bottom support member; 4112, connecting pin; 412, reinforcing plate; 4121, interactive hole; 41211, interactive hole side wall; 413, frame end face; 42, boat support ear; 43, accommodating cavity; 431, boat accommodating area; 431a, first small Boat storage area; 431b, second boat storage area; 432, passivation channel; 4321, sidewall air channel; 4321a, first sidewall air channel; 4321b, second sidewall air channel; 4322, central air channel; 500, boat; 51, boat body; 511, boat bottom plate; 5111, boat foot; 5112, positioning hole; 512, boat body ear; 5121, perforation hole; 513, transport trough ; 514, positioning block; 515, battery cell compartment; 5151, opening; 5152, opening end face; 52, pressure plate unit; 521, pull plate; 522, pull rod; 523, elastic member; 524, pressure plate; 53, air flow baffle; 531, upper air flow baffle; 532, side air flow baffle; 532a, first side air flow baffle; 532b, second side air flow baffle; 533, baffle end face. DETAILED DESCRIPTION

[0034] The serial numbers assigned to the components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any order or technical meaning. The terms "connection" and "coupling" used in this application, unless otherwise specified, include both direct and indirect connections (couplings). In the description of this application, it should be understood that the terms "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," "counterclockwise," and the like, indicating positions or positional relationships, are based on the positions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0035] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0036] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0037] refer to Figure 1 、 Figure 2 as well as Figure 3 The present application provides a passivation device for passivating a battery cell W, the passivation device includes a shell 100, an air intake assembly 200, an air extraction assembly 300, and a passivation crystal boat composed of a boat support 400 and a small boat 500; the shell 100 has a working space 11 inside, the air intake assembly 200 is arranged at the upper part of the working space 11, the air extraction assembly 300 is arranged at the lower part of the working space 11, the passivation crystal boat is arranged in the working space 11 and the passivation crystal boat is located between the air intake assembly 200 and the air extraction assembly 300, specifically, the small boat 500 is used to accommodate the battery cell W to be passivated, the boat support 400 supports the small boat 500 and constructs a passivation channel 432 corresponding to the battery cell W. During operation, the passivation airflow flows downward from the upper air inlet assembly 200 to the passivation crystal boat. When the passivation airflow flows through the passivation channel 432 of the passivation crystal boat, the movement direction of the passivation airflow is parallel to the surface to be passivated. After part / all of the passivation airflow and the battery cells W in the passivation crystal boat undergo a passivation reaction, the remaining passivation airflow and / or post-reaction gas leave downward from the exhaust assembly 300.

[0038] It is understandable that the various components in the present application are arranged based on the direction of movement of the passivation airflow. The specific embodiment of the present application illustrates the structure of the passivation airflow flowing downward from the upper air intake assembly 200 to the passivation crystal boat, but the protection scope of the present application obviously also includes the passivation airflow entering from bottom to top, from left to right, from right to left, from front to back, and from back to front. Of course, in addition to the aforementioned scheme of the passivation airflow entering from a certain positive direction and then exiting from another relative positive direction, the protection scope of the present application also includes the passivation airflow entering from an oblique direction and exiting from an oblique direction, entering from an oblique direction and exiting from a positive direction, and entering from a positive direction and exiting from an oblique direction. The aforementioned oblique direction can be any direction, and the positive direction can also be any direction. In addition, when the movement direction of the aforementioned passivation airflow changes, the position layout of the relative components is also adaptively adjusted accordingly. For example, if the passivation airflow is drawn in from front to back, the air intake assembly 200 is arranged at the front of the working space 11, the air extraction assembly 300 is arranged at the back of the working space 11, the passivation crystal boat is arranged in the working space 11 and the passivation crystal boat is located between the air intake assembly 200 and the air extraction assembly 300, and the passivation channel 432 of the passivation crystal boat is arranged in the front-to-back direction.

[0039] Housing 100, reference Figure 1 The workspace 11 within the housing 100 is an openable and closable space. When open, the workspace 11 allows the passivation wafer boat to enter and exit the workspace 11. Specifically, the opening and closing of the workspace 11 are located on the side of the housing 100 to prevent interference between the passivation wafer boat and the air intake assembly 200 / air extraction assembly 300 during entry and exit. Exemplarily, the opening and closing of the workspace 11 are located on the left or right side of the housing 100. The passivation wafer boat is pushed / lifted into the workspace 11 by a robot or a boat pushing mechanism.

[0040] Intake assembly 200, reference Figure 1 The air intake assembly 200 is used to evenly distribute air to the passivation wafer boat so that the passivation airflow velocity and concentration corresponding to each cell W are relatively consistent. Specifically, the air intake assembly 200 includes an air intake plate 22, an air intake pipe 21 and a guide plate 23. Figure 3 The air intake pipe 21 is connected to the shell 100, and the air intake pipe 21 introduces the passivation air flow from the outside to the inside into the working space 11 of the shell 100; the air intake plate 22 is located in the working space 11, and the air intake plate 22 is below the air intake pipe 21, and an air intake route is formed between the air intake pipe 21 and the air intake plate 22; and the guide plate 23 is located on the air intake route between the air intake pipe 21 and the air intake plate 22, and the passivation air flow moving out of the air intake pipe 21 is diffused to the surroundings through the guide plate 23, and is diffused secondary through the air intake plate 22.

[0041] It will be appreciated that when the boats 500 are arranged around the passivation channel 432 and arranged in multiple directions, it is preferred that the air inlet pipe 21 be positioned above the center of the passivation channel 432 to facilitate uniform air distribution. The specific placement of the air inlet pipe 21 is related to the shape of the passivation channel 432 parallel to the air inlet plate 22. If the passivation channel 432 is circular or polygonal in shape parallel to the air inlet plate 22, a single air inlet pipe 21 can be centrally positioned, or multiple air inlet pipes 21 can be arranged around the center of the passivation channel parallel to the air inlet plate 22. If the passivation channel 432 is elongated or zigzag in shape parallel to the air inlet plate 22, the passivation channel 432 can be virtually divided into multiple segments, each segment being provided with one or more air inlet pipes 21. If the passivation channel 432 is elongated in shape parallel to the air inlet plate 22, multiple air inlet pipes 21 can be arranged equidistantly along the center of the aforementioned rectangle.

[0042] The guide plate 23 is connected to the air intake pipe 21 or the air intake plate 22. The guide plate 23 is correspondingly arranged directly below the air intake pipe 21 toward the air intake plate 22, and the number of guide plates 23 corresponds to the number of air intake pipes 21, so that the passivation airflow flowing downward from the air intake pipe 21 can act vertically on the guide plate 23; the guide surface of the guide plate 23 is a circular plane, so that the passivation airflow can be evenly diffused to the surroundings after hitting the guide surface, thereby achieving the purpose of one-time diffusion.

[0043] Inlet plate 22, reference Figure 4 , divided into an air intake area 221 and an isolation area 222. The air intake area 221 and the isolation area 222 are separated by a partition 223. The air intake area 221 is provided with a plurality of air intake holes to allow for secondary diffusion of the passivated airflow after primary diffusion by the guide plate 23. The isolation area 222 is provided to provide the air intake plate 22 with a certain width, thereby increasing the overall structural strength of the air intake plate 22 and facilitating the fixation between the air intake plate 22 and the housing 100. It is understood that in another embodiment, the air intake plate 22 can be made without the isolation area 222, and can be a plate with only the air intake area 221. In other embodiments, the partition 223 can also be eliminated.

[0044] Extraction assembly 300, reference Figure 1 and Figure 3 The exhaust assembly 300 is used to extract air from the lower end of the passivation wafer boat, ensuring stable unidirectional airflow within the passivation wafer boat, allowing the passivation airflow to continuously react with the passivation surface WC of the cell W. Specifically, the exhaust assembly 300 includes an exhaust pipe 31 and an exhaust plate 32. The exhaust pipe 31 extends from the outside to the inside of the working space 11 of the housing 100. The exhaust plate 32 is located within the working space 11 and above the exhaust pipe 31. The exhaust plate 32 ensures stable air extraction from the exhaust pipe 31 into the passivation channel 432.

[0045] It should be noted that the reference Figure 2 and Figure 5 The exhaust plate 32 is divided into at least a first exhaust zone 321 and a second exhaust zone 322. The first exhaust zone 321 forms a central air duct 4322 for passivation airflow movement in the passivation channel 432. The second exhaust zone 322 forms a side wall air duct 4321 for passivation airflow movement in the passivation channel 432. The side wall air duct 4321 is located between the central air duct 4322 and the opening 5151 on the boat 500, and the airflow suction force generated by the second exhaust zone 322 is greater than the airflow suction force generated by the first exhaust zone 321, so that the passivation airflow in the central air duct 4322 has a tendency to move toward the side wall air duct 4321, and the passivation airflow in the side wall air duct 4321 has a tendency to move toward the opening 5151 (i.e., a tendency to move toward the surface WC to be passivated).

[0046] Specifically, the magnitude of the airflow suction force is affected by the unit air permeability area and the unit area air extraction negative pressure value. Under the same conditions, if the unit air permeability area is large, the airflow suction force per unit area is large, and if the unit area air extraction negative pressure value is large, the airflow suction force per unit area is large. Therefore, in order to make the airflow suction force generated by the second air extraction zone 322 greater than the airflow suction force generated by the first air extraction zone 321, the unit air permeability area of ​​the second air extraction zone 322 can be set to be greater than the unit air permeability area of ​​the first air extraction zone 321, such as by setting the number and / or aperture of the second air extraction holes 3221 in the second air extraction zone 322 to exceed the first air extraction holes 3211 in the first air extraction zone 321; or, it can be set so that the unit area air extraction negative pressure value acting on the second air extraction zone 322 is greater than the unit area air extraction negative pressure value acting on the first air extraction zone 321, such as by dividing the air extraction pipe 31 into two groups, with the two groups of air extraction pipes 31 acting on the first air extraction zone 321 and the second air extraction zone 322 respectively.

[0047] Because the function of the second air extraction area 322 is to direct the passivation airflow toward the cell W based on the Bernoulli principle, the number of second air extraction areas 322 corresponds to the number of small boat accommodating areas 431 provided on the boat support 400. A plurality of second air extraction areas 322 are provided, and these second air extraction areas 322 are arranged around the first air extraction area 321. Furthermore, a plurality of small boat accommodating areas 431 are provided, and the sidewall air passages 4321 formed by these small boat accommodating areas 431 and the second air extraction areas 322 are arranged in a one-to-one correspondence. For example, two second air extraction areas 322 are provided, and the two second air extraction areas 322 are located on either side of the first air extraction area 321, so that the second air extraction areas 322 correspond to the small boat accommodating areas 431 provided on either side of the wafer boat.

[0048] It is understandable that the area with the shortest route from the exhaust plate 32 to the exhaust pipe 31 is the restricted area 3212, and the unit air permeability area on the restricted area 3212 is less than the unit air permeability area of ​​the adjacent area with the same attribute of the restricted area 3212, so that the exhaust pipe 31 can evenly exhaust the first exhaust area 321 and the second exhaust area 322, avoiding the suction force of the exhaust pipe 31 on the restricted area 3212 being greater than that on other areas, resulting in uneven exhaust in the entire area. In one embodiment, referring to Figure 5 The restricted area 3212 is located in the first air extraction area 321 and is an airtight plane or a plane provided with a small number of first air extraction holes 3211. In another embodiment, the restricted area 3212 is located in the second air extraction area 322 and is offset from the open end surface 5152 of the boat 500. It is worth mentioning that the logic of setting the restriction zone 3212 can also be reversed. At this time, the restriction zone 3212 exists as an airflow acceleration zone. The unit air permeability area on the restriction zone 3212 is ≥ the unit air permeability area of ​​the same attribute area adjacent to the restriction zone 3212. The restriction zone 3212 corresponds to one or several boats 500 upward. At this time, the exhaust pipe 31 below the restriction zone 3212 directly sucks the gas near the restriction zone 3212, so that the flow rate of the passivation airflow flowing through the boat 500 is faster than that of other areas. Under the action of Bernoulli's principle, the passivation airflow flowing out of the air inlet plate 22 will flow toward the boat 500 and flow downward along the boat 500.

[0049] Regarding the functions of the first air pumping area 321 and the second air pumping area 322, refer to Figure 4 and Figure 6, the first air pumping area 321 and the second air pumping area 322 are used to make the passivation channel 432 in the working state form a central air channel 4322 and a side wall air channel 4321, and since the air flow suction force generated by the second air pumping area 322 is greater than the air flow suction force generated by the first air pumping area 321, when the upper air intake component 200 evenly distributes air downward, the flow rate of the passivation air flow in the side wall air channel 4321 is greater than the flow rate of the passivation air flow in the central air channel 4322. Based on the Bernoulli principle, it can be concluded that the pressure in the side wall air channel 4321 is less than the pressure in the central air channel 4322, so that there is a pressure F based on the pressure difference in the central air channel 4322 acting laterally on the side wall air channel 4321. Under the action of the aforementioned pressure F, the passivation air flow in the central air channel 4322 has There is a tendency to move toward the side wall air channel 4321, that is, a part of the passivation air flow still flows downward under the extraction effect of the second exhaust zone 322, while the other part of the passivation air flow flows toward the side wall air channel 4321 under the action of the aforementioned pressure F; similarly, since the opening 5151 of the boat 500 is set on one side of the side wall air channel 4321, the passivation air flow in the side wall air channel 4321 also has a tendency to flow toward the opening 5151, and since the passivation surface WC of the battery cell W is in the opening 5151, the proportion of the passivation air flow toward the passivation surface WC is increased, and the proportion of the passivation air flow participating in the passivation reaction is increased, that is, the overall passivation air flow intake can be reduced, thereby solving the technical problem of how to save the amount of passivation gas in the prior art and achieving the technical effect of saving the amount of passivation gas.

[0050] Furthermore, after multiple experiments, the flow rate of the passivation airflow in the sidewall airway 4321 is between 0.06 and 0.09 mm / s, and the flow rate of the passivation airflow in the sidewall airway 4321 is greater than the flow rate of the passivation airflow in the central airway 4322, which is the best. Example 1: The flow rate of the passivation airflow in the sidewall airway 4321 is 0.07 mm / s, and the flow rate of the passivation airflow in the central airway 4322 is 0.06 mm / s. Example 2: The flow rate of the passivation airflow in the sidewall airway 4321 is 0.07 mm / s, and the flow rate of the passivation airflow in the central airway 4322 is 0.03 mm / s. Example 3: The flow rate of the passivation airflow in the sidewall airway 4321 is 0.08 mm / s, and the flow rate of the passivation airflow in the central airway 4322 is 0.06 mm / s.

[0051] Furthermore, since this solution generates a pressure differential based on a velocity difference, the pressure differential causes the airflow within the first pumping zone 321 to flow toward the cell W. Therefore, when multiple second pumping zones 322 are provided, the area of ​​the first pumping zones 321 will also affect the passivation effect. Specifically, the area of ​​the first pumping zones 321 is preferably S1 ≥ S2 * N, where the area of ​​the first pumping zone 321 on the pumping plate 32 is S1, the area of ​​the second pumping zone 322 on the pumping plate 32 is S2, and the number of second pumping zones 322 is N. On the other hand, since the present solution uses a pressure difference to make the air flow toward the battery cell W, the width of the second air pumping zone 322 will also affect the proportion of the air flow toward the battery cell W; illustratively, the shortest distance (i.e., the aforementioned width) of the second air pumping zone 322 from the side close to the first air pumping zone 321 to the opposite side close to the boat accommodating area 431 is D2, and D2≤15cm, so that the pressure difference between the central air duct 4322 and the side wall air duct 4321 can push the passivation airflow located in the side wall air duct 4321 to act on the battery cell W in the boat 500.

[0052] Passivation wafer boat, reference Figure 7 and Figure 8 , serving as a tool for accommodating battery cells W in batches, and loading / unloading battery cells W into / from the workspace 11 in batches. Specifically, the boat holder 400 in the passivation wafer boat is a frame structure used to accommodate a number of small boats 500 that can accommodate battery cells W. The boat holder 400 defines the position of the small boats 500 and enables integrated entry and exit relative to the workspace 11.

[0053] For the position of the passivation wafer boat in the work space 11, refer to Figure 1 and Figure 6 The boat 500 and the air inlet assembly 200 and the air extraction assembly 300 are each provided with gaps. The upper gap between the air inlet assembly 200 and the opening 5151 allows the air flow fluctuations of the passivation airflow to be staggered with the opening 5151 when entering the passivation channel 432. A lower gap is provided between the air extraction plate 32 and the opening 5151, allowing the air flow fluctuations of the passivation airflow to be staggered with the opening 5151 when entering the air extraction plate 32. In addition, the above arrangement also helps to avoid the flow velocity difference of the passivation airflow between the central air channel 4322 and the side wall air channel 4321 being too small or too large. Only the middle section of the passivation airflow in the passivation channel 432 is selected, so that the flow velocity difference between the central air channel 4322 and the side wall air channel 4321 is relatively consistent, thereby ensuring that under the same passivation time, the passivation airflow has a substantially consistent passivation effect on the battery cells W located above and below the middle section of the passivation channel 432, thereby meeting stable batch passivation requirements.

[0054] Zhoutuo 400, reference Figure 1 and Figure 2The boat support 400 includes a frame 41, boat support ears 42, and a accommodating cavity 43 located within the frame 41. The accommodating cavity 43 includes a passivation channel 432 and a small boat accommodating area 431 located on one side of the passivation channel 432. The passivation channel 432 extends through both ends of the air inlet assembly 200 and the air extraction assembly 300 to form a movement path for the passivation airflow within the passivation wafer boat. The passivation airflow flowing in the passivation channel 432 passivates the battery cells W located on one side. It is understood that the boat support ears 42 are fixedly arranged on the outside of the frame 41 as a transport fulcrum to facilitate the coordination between the boat support 400 and semi-automated / automated transport equipment for the turnover and transportation of the passivation wafer boat. The specific number and specific arrangement of the boat support ears 42 are determined by the transport equipment and the style of the workspace 11.

[0055] Furthermore, to increase the yield of passivated cell W, the number and relative positional relationship of the passivation channels 432 and the boat accommodating areas 431 can be optimized. Preferably, the passivation channel 432 is centrally located, with the plurality of boat accommodating areas 431 disposed around it. Furthermore, the second exhaust zones 322 in the exhaust assembly 300 are disposed in a plurality relative to the plurality of boat accommodating areas 431, so that the passivation airflow in the central air channel 4322 is divided into a plurality of portions based on the distance relative to the plurality of sidewall air channels 4321, and the plurality of passivation airflows flow toward the plurality of sidewall air channels 4321, ultimately causing the plurality of portions of the passivation airflow to act on the boats 500 in the plurality of boat accommodating areas 431.

[0056] In one embodiment, reference Figure 2 and 6 The air extraction plate 32 is provided with a first air extraction area 321 and two second air extraction areas 322, and the two second air extraction areas 322 are symmetrically arranged on opposite sides of the first air extraction area 321 to form a central air channel 4322 and two side wall air channels 4321 located on both sides of the central air channel 4322; the accommodating chamber 43 includes a passivation channel 432 and two boat accommodating areas 431, and the two boat accommodating areas 431 are symmetrically arranged on opposite sides of the passivation channel 432, wherein the passivation channel 432 is located above the first air extraction area 321, and the two boat accommodating areas 431 are respectively located above the two second air extraction areas 322; there is a flow velocity difference between the first side wall air channel 4321a and the central air channel 4322, and there is also a flow velocity difference between the second side wall air channel 4321b and the central air channel 4322. Based on the two flow velocity differences, the passivation airflow in the central air channel 4322 is divided into two parts and flows to the two side wall air channels 4321.

[0057] Each boat accommodating area 431 can accommodate a plurality of boats 500. The boats 500 are distributed along the arrangement path of the second pumping area 322 on the pumping plate 32. If the arrangement path of the second pumping area 322 is a straight path, the boats 500 are also distributed in a straight line along the straight path of the second pumping area 322. In this case, the open end surfaces 5152 of the boats 500 are preferably located in the same plane, facing the passivation channel 432. If the arrangement path of the second pumping area 322 is a zigzag path, the boats 500 are also distributed in a straight line along the zigzag path of the second pumping area 322. In this case, the open end surfaces 5152 are located in multiple planes along the zigzag path, facing the passivation channel 432. It should be noted that the second air extraction zone 322 can also be arranged along a curved path. However, in this case, many corners of the boats 500 distributed along the zigzag path will be relatively far from the sidewall air passage 4321, which will affect the uniformity of the passivation effect and the amount of passivation airflow. In addition to being arranged substantially perpendicular to the air intake direction of the passivation channel 432, multiple boats 500 can also be arranged along the air intake direction of the passivation channel 432 to accommodate more boats 500.

[0058] The boat accommodating area 431 is used to accommodate the boat 500 and to position the boat 500. The specific positioning method of the boat 500 can be that the boat 500 and the boat support 400 are connected, supported, magnetically attracted, plugged, or clamped. Figure 8 In addition to the main frame 411, the frame 41 is also provided with a bottom support member 4111 and a connecting pin 4112. The bottom support member 4111 can be in the shape of a strip, sheet, plate, or pillar. The bottom support member 4111 is used to support the boat 500, and the connecting pin 4112 provided on the bottom support member 4111 can position the boat 500 on the bottom support member 4111 to prevent the boat 500 from shifting or shaking on the bottom support member 4111. In addition, it is understood that in order to cooperate with the connecting pin 4112, a positioning hole 5112 is provided on the bottom of the boat 500, so that the boat 500 and the boat support 400 can be detachably fixed.

[0059] Xiaozhou 500, reference Figure 8 The boat 500 is used to accommodate battery cells W in batches, while leaving only the surface WC of the battery cells W to be passivated exposed to prevent wrap-around plating of the battery cells W. The boat 500 includes a boat body 51, a pressure plate unit 52, and an airflow baffle 53. A battery cell compartment 515 with an opening 5151 is provided within the boat body 51. The opening 5151 faces the passivation channel 432. The battery cells W are accommodated in the battery cell compartment 515 through the opening 5151, with the surface WC of the battery cells W to be passivated positioned at the opening 5151. The passivation airflow from the passivation channel 432 acts on the surface WC through the opening 5151.

[0060] It is understood that the open end surface 5152 where the opening 5151 on the boat 500 is located is substantially parallel to the sidewall air channel 4321 formed by the second exhaust zone 322, which facilitates the passivation airflow to act on the surface to be passivated WC at an angle substantially perpendicular to the surface to be passivated WC under the pressure generated by the pressure difference, so that the passivation airflow can efficiently passivate the battery cells W, saving the amount of passivation airflow. In order to protect the remaining surfaces of the battery cells W from the influence of the passivation airflow and avoid plating around, the remaining surfaces of the battery cell compartment 515 are all provided with plates for protection; the boat bottom plate 511, which serves as the bottom plate of the battery cell compartment 515, can also be provided with protruding boat feet 5111 to set positioning holes 5112 that adapt to the boat support 400.

[0061] Regarding the size of the battery compartment 515, refer to Figure 9 The depth dimension of the battery cell compartment 515 from the opening 5151 inward is ≥ the dimension L1 from the surface to be passivated WC of the battery cell W to the surface opposite to the surface to be passivated WC, so that the surface to be passivated WC of the battery cell W accommodated in the battery cell compartment 515 is flush or substantially flush with the open end surface 5152; the width dimension of the opening 5151 is ≥ the width dimension L2 of the surface to be passivated WC of the battery cell W, and the width dimension of the opening 5151 is ≤ the width dimension L2+2mm of the surface to be passivated WC of the battery cell W, that is, the single-side spacing between the opening 5151 and the battery cell W in the width direction is ≤1mm, so that the battery cell W can be placed into the battery cell compartment 515 through the opening 5151.

[0062] Platen unit 52, reference Figure 9 The pressure plate unit 52 includes a pressure plate 524, an elastic member 523, a pull plate 521 and a pull rod 522. The pressure plate 524 is movably arranged in the battery cell compartment 515, and the pressure plate 524 and the boat body 51 together form the outline of the opening 5151, that is, the pressure plate 524 exists as a plate on the upper end surface of the battery cell compartment 515; the elastic member 523 is connected or abutted between the pressure plate 524 and the boat body ear 512 of the boat body 51, and the elastic member 523 presses the pressure plate 524 downward based on the boat body ear 512 in a fixed state. The pressure plate 524 presses the battery cell W; the pulling plate 521 is located on the outside of the battery cell compartment 515, and the two ends of the pulling rod 522 are respectively connected to the pressure plate 524 and the pulling plate 521 (the pulling rod 522 can bypass the boat body ear 512, or a perforation 5121 can be set on the boat body ear 512, and the pulling rod 522 directly passes through the boat body ear 512), so that the pressure plate 524 can overcome the pressure of the elastic member 523 and be lifted up, so that the outline size of the opening 5151 of the battery cell compartment 515 can be adjusted, thereby facilitating the removal of the battery cell W.

[0063] Regarding the setting position of the pull plate 521, one is that the opening 5151 is located on the front of the boat body 51, and the pull plate 521 is located on the back of the boat body 51; the other is that the opening 5151 is located on the front of the boat body 51, and the pull plate 521 is located on the side of the boat body 51 (preferably the upper end face), and the pull plate 521 protrudes from the side of the boat body 51 toward the passivation channel 432; an airflow baffle 53 or the skeleton 41 of the boat support 400 is provided between the pull plate 521 and the passivation channel 432 to limit the passivation airflow from moving toward the pull plate 521.

[0064] In the present application, the setting of the pressure plate unit 52 has three advantages. First, it can flexibly press the battery cells W, and the number of battery cells W accommodated in the battery cells W is not strictly limited within a certain range; second, automated equipment such as robots can directly lift the pressure plate 524, so that the size of the opening 5151 can be automatically adjusted conveniently to facilitate the placement of the battery cells W into the battery cell compartment 515; third, the pressure plate 524 is part of the outline of the opening 5151. Under the action of the elastic member 523, the pressure plate 524 will contact or fit with the battery cell W, thereby reducing the gap between the opening 5151 and the battery cell W.

[0065] It is understandable that in order to conveniently transport the boat 500 and for the manipulator to control the pressure plate 524, a transport groove 513 or a positioning block 514 or other structures need to be provided on the boat 500. There are multiple design options for these structures. One is to protrude from the side of the boat 500. Although there will be a gap between adjacent boats 500, this gap can be blocked by the airflow baffle 53 and / or part of the skeleton 41 to ensure that the boats in the same boat accommodating area 431 form a smooth plane facing the passivation channel 432 without protrusions or depressions that interfere with the airflow; the second is to make it concave so that adjacent boats 500 can fit tightly together; the third is to provide a protrusion on the back of the boat 500. The back does not affect the tight fit between adjacent boats 500, nor does it affect the boats 500 in the boat accommodating area 431 forming a complete plane without protrusions or depressions that interfere with the airflow. The specific implementation plan is as follows:

[0066] refer to Figure 8 and Figure 10 The skeleton 41 has a skeleton end face 413 on one side opposite to the passivation channel 432, and a gap is maintained between the boat bodies 51 of adjacent boats 500, wherein part of the skeleton 41 is located in the gap between the adjacent boat bodies 51, and the skeleton end face 413 of the skeleton 41 is flush or substantially flush with the open end faces 5152 of the two adjacent boats 500, and the above gap is blocked by the skeleton 41.

[0067] It should also be emphasized about the skeleton 41 that, for the sake of structural strength of the skeleton 41, the skeleton 41 includes a skeleton body 411 and a reinforcement plate 412. The skeleton body 411 is used to construct the passivation channel 432 and the boat accommodating area 431. The reinforcement plate 412 is located in the passivation channel 432. The reinforcement plate 412 connects the skeleton body 411 so that the parts of the skeleton body 411 at two positions of the passivation channel 432 constitute a whole. Among them, since the reinforcement plate 412 is located in the passivation channel 432, it will interfere with the flow of the passivation airflow. To this end, the length direction of the reinforcement plate 412 is arranged along the length direction of the passivation channel 432, that is, the reinforcement plate 412 is arranged along the basic movement direction of the passivation airflow to avoid the reinforcement plate 412 directly blocking the passivation airflow. Furthermore, the reinforcing plate 412 is designed as a plate body with interactive holes 4121, and the interactive holes 4121 allow the passivation airflow to shuttle through the reinforcing plate 412; the reinforcing plate 412 is set between the fixed positions of the two boats 500, and the interactive holes 4121 correspond to the open end surface 5152 on the boat 500, and the side wall of the interactive hole 4121 relative to the open end surface 5152 is flush or basically flush with the open end surface 5152. While ensuring the overall structural strength of the boat support 400, it is tried to ensure that the open end surfaces 5152 of all boats 500 in the same area and the skeleton 41 form a flat surface, so that the passivation airflow flows evenly through the aforementioned flat surface.

[0068] refer to Figure 8 、 Figure 9 and Figure 11 The airflow baffle 53 is connected to the outside of the battery cell compartment 515, and a gap is maintained between the boat bodies 51 of adjacent boats 500, wherein the airflow baffle 53 is located in the gap between the adjacent boat bodies 51, and the baffle end surface 533 of the airflow baffle 53 is flush or substantially flush with the open end surfaces 5152 of the two adjacent boats 500, and the above gap is blocked by the airflow baffle 53.

[0069] Specifically, the airflow baffles 53 are divided into upper airflow baffles 531 and side airflow baffles 532 according to their orientation relative to the boat body 51. The specific number and position of the airflow baffles are determined by the structure of the protrusion on the boat body 51. Figure 8 The top surface of the boat body 51 is provided with a protruding pull plate 521, and the sides of the boat body 51 are provided with protruding positioning blocks 514. Therefore, an upper airflow baffle 531 is provided at the top of the boat body 51 to shield the pull plate 521. A first side airflow baffle 532a and a second side airflow baffle 532b are provided on both sides of the boat body 51 to shield the positioning blocks 514.

[0070] refer to Figure 8 、 Figure 10 and Figure 11The skeleton 41 has a skeleton end face 413 relative to the passivation channel 432; the airflow baffle 53 is connected to the outside of the battery cell compartment 515; a gap is maintained between the boat bodies 51 of adjacent boats 500, wherein part of the skeleton 41 and the airflow baffle 53 are arranged in the gap between the adjacent boat bodies 51, and the skeleton end face 413 of the skeleton 41, the baffle end face 533 of the airflow baffle 53 and the open end faces 5152 of the two adjacent boats 500 are flush or basically flush, and the above-mentioned gap is blocked by the skeleton 41 and the airflow baffle 53, so that when the passivation airflow passes through the gap, the airflow velocity and flow direction have no obvious fluctuations.

[0071] refer to Figure 12 In some embodiments, structures such as the transport groove 513 or the positioning block 514 are all concavely arranged on the side of the boat body 51 to make the side of the boat body 51 flat, and the boat bodies 51 between adjacent boats 500 are arranged to fit together. In the absence of an airflow baffle 53, the open end surfaces 5152 between adjacent boats 500 are ensured to be spliced ​​into a flat surface without bumps, so that the passivation airflow can act evenly on each battery cell W from top to bottom.

[0072] Working principle:

[0073] During operation, the passivation gas flow flows downward from the upper air inlet assembly 200 to the boat 500 , and finally, the remaining passivation gas flow and the post-reaction gas leave downward from the exhaust assembly 300 .

[0074] During the process of the passivation airflow flowing through the passivation channel 432 (virtually divided into a central airway 4322 and a sidewall airway 4321), based on the fact that the airflow suction force generated by the second air extraction zone 322 in the air extraction component 300 is greater than the airflow suction force generated by the first air extraction zone 321, according to Bernoulli's principle, the passivation airflow in the central airway 4322 tends to move toward the sidewall airway 4321, and the passivation airflow in the sidewall airway 4321 tends to move toward the battery cell W located on the side, so as to improve the passivation efficiency between the passivation airflow and the surface to be passivated WC.

[0075] Beneficial effects:

[0076] 1. In this application, boat-accommodating areas 431 for accommodating multiple boats 500 surround a passivation channel 432, and the surfaces WC of the cells W in the boats 500 to be passivated are aligned in the same plane and face the passivation channel 432. This ensures that the boats 500 are evenly arranged relative to the passivation channel 432, and that the surfaces WC of the cells W in the boats 500 to be passivated are evenly arranged relative to the passivation channel 432. This allows the passivation gas in the passivation channel 432 to flow in multiple directions, uniformly passivating the cells W. This allows a single passivation channel 432 to passivate a batch of cells W. This solves the prior art problem of improving the passivation uniformity of the cells W and achieves the technical effect of uniformly passivating a batch of cells W.

[0077] 2. In this application, the depth dimension of the cell compartment 515 from the opening 5151 inward is defined as being ≥ the dimension L1 from the surface to be passivated WC of the cell W to the surface opposite to the surface to be passivated WC, so that when the cell W is placed, the surface to be passivated WC of the cell W is flush or substantially flush with the open end surface 5152 of the boat 500, and the passivation airflow flows evenly through the open end surface 5152 and the surface to be passivated WC of the cell W, which can keep the airflow velocity and pressure in a relatively stable state, thereby improving the surface to be passivated WC. consistency of the coating; in addition, by setting the width dimension of the opening 5151 ≤ the width dimension L2+2mm of the surface WC of the battery cell W to be passivated, it is ensured that the surface WC of the battery cell W to be passivated placed in the battery cell compartment 515 is completely exposed, and the gap between the opening 5151 and the battery cell W is minimized as much as possible, so that the gas acts only on the surface WC of the battery cell W to be passivated as much as possible, reducing unnecessary coating of other surfaces of the battery cell W by the passivation airflow, that is, gradually reducing the occurrence of wrap-around plating.

[0078] 3. In this application, the structural surface of the passivation wafer boat facing the passivation channel 432 is designed to be a coplanar, flat surface. This ensures that the velocity and pressure of the passivation airflow in the passivation channel 432 remain stable as it passes through the structural surface, resulting in uniform coating. Specifically, the aforementioned structural surface primarily includes the open end surface 5152 of the boat 500. To reduce gaps in the structural surface, adjacent boats 500 can be brought as close together as possible, or even fit together, by placing protruding structures on the opposite side of the boat 500 relative to the open end surface 5152. Alternatively, gaps in the structural surface can be covered or blocked by using the skeleton end surface 413 of the boat support 400, the airflow baffle 53 of the boat 500, or a combination of the skeleton end surface 413 and the airflow baffle 53.

[0079] 4. In this application, the specific solution for the passivation wafer boat is to have two boat-accommodating areas 431 symmetrically arranged on opposite sides of a passivation channel 432. The structural surface formed in each boat-accommodating area 431 and facing the passivation channel 432 is a flat surface. The two parallel structural surfaces on opposite sides of the passivation channel 432 facilitate uniform flow of the passivation gas flow through the open end surface 5152 of each boat 500 in each boat-accommodating area 431.

[0080] 5. In this application, the provision of the pressure plate unit 52 has three advantages. First, it allows for flexible compression of the battery cells W, eliminating strict limits on the number of battery cells W that can be accommodated within a certain range. Second, it facilitates the lifting of the pressure plate 524 by automated equipment such as a robot arm to facilitate the placement of the battery cells W into the battery cell compartment 515. Third, as part of the contour of the opening 5151, the pressure plate 524, under the action of the elastic member 523, contacts or fits the battery cells W, reducing the gap between the opening 5151 and the battery cells W.

[0081] 6. In this application, the air extraction plate 32 of the air extraction assembly 300 is divided into a first air extraction zone 321 and a second air extraction zone 322, so that the passivation channel 432 in the working state forms a central airway 4322 and a sidewall airway 4321. Since the airflow suction force generated by the second air extraction zone 322 is greater than the airflow suction force generated by the first air extraction zone 321, the flow rate of the passivation airflow in the sidewall airway 4321 is greater than the flow rate of the passivation airflow in the central airway 4322. Based on the Bernoulli principle, it can be concluded that the pressure in the sidewall airway 4321 is less than the pressure in the central airway 4322, so that a pressure difference in the central airway 4322 acts laterally on the sidewall airway 4322. 1, under the action of the aforementioned pressure, the passivation airflow in the central airway 4322 has a tendency to move toward the side wall airway 4321; similarly, since the open end face 5152 of the boat 500 is arranged on one side of the side wall airway 4321, the passivation airflow in the side wall airway 4321 also has a tendency to move toward the open end face 5152, thereby changing the movement direction of the passivation airflow, increasing the proportion of the passivation airflow toward the to-be-passivated surface WC of the battery cell W, and increasing the proportion of the passivation airflow participating in the passivation reaction, that is, reducing the overall amount of passivation airflow introduced, thereby solving the technical problem of how to save the amount of passivation gas in the prior art, and achieving the technical effect of saving the amount of passivation gas.

[0082] 7. In this application, specifically to ensure that the airflow suction force generated by the second air extraction zone 322 is greater than the airflow suction force generated by the first air extraction zone 321, that is, to achieve a flow rate of the passivating airflow in the sidewall airway 4321 greater than the flow rate of the passivating airflow in the central airway 4322, the following methods are employed: first, under the same negative air extraction pressure, the unit air permeability area of ​​the second air extraction zone 322 is greater than the unit air permeability area of ​​the first air extraction zone 321, thereby facilitating the flow of the passivating airflow out of the second air extraction zone 322 and increasing the flow rate of the passivating airflow through the sidewall airway 4321; second, the unit air extraction pressure acting on the second air extraction zone 322 is greater than the unit air extraction pressure acting on the first air extraction zone 321. Higher negative air extraction pressures naturally increase the flow rate of the passivating airflow. Of course, the above two methods can be combined to further increase the flow rate difference between the sidewall airway 4321 and the central airway 4322.

[0083] 8. In this application, to improve the passivation efficiency of the passivation device, a plurality of second extraction zones 322 may be provided on the extraction plate 32. This allows the passivation wafer boat to be provided with a plurality of boat accommodating zones 431. Each boat accommodating zone 431 is located on one side of the second extraction zone 322, so that the passivation airflow in the sidewall air duct 4321 can act on the passivation surface WC of the cell W due to the pressure difference. Considering the specific volume, it is more appropriate to arrange the plurality of second extraction zones 322 around the first extraction zone 321, with the boat accommodating zones 431 arranged outside the second extraction zones 322, corresponding to the second extraction zones 322.

[0084] 9. In the present application, each boat-accommodating area 431 can accommodate a plurality of boats 500, and the arrangement of the boats 500 in the boat-accommodating area 431 is determined by the arrangement path of the second air extraction area 322. Specifically, if the second air extraction area 322 is a straight path, the boats 500 are arranged along the straight path; if the second air extraction area 322 is a zigzag path, the boats 500 are arranged along the zigzag path. Of course, the second air extraction area 322 can also be a curved path. However, in the case of a curved path, since the surface WC of the cell W to be passivated is a flat surface, the boats 500 are arranged to simplify the curved path of the second air extraction area 322 into a zigzag or straight path, so that the passivation airflow can be evenly applied to the surface WC of the cell W to be passivated.

[0085] 10. In the present application, an upper spacing is provided between the air inlet assembly 200 and the opening 5151 of the boat 500, and a lower spacing is provided between the air extraction assembly 300 and the opening 5151 of the boat 500. These upper and lower spacings prevent the first and last sections of the passivation airflow from acting on the solar cells W, thus avoiding interference caused by uneven airflow inflow and outflow, airflow fluctuations, and other factors. Furthermore, this arrangement also helps prevent excessive or insignificant differences in the velocity of the passivation airflow between the central airway 4322 and the sidewall airways 4321. By focusing only on the middle section of the passivation channel 432, the velocity differences between the central airway 4322 and the sidewall airways 4321 are relatively consistent. This ensures that, under the same passivation time, the passivation airflow has a substantially consistent passivation effect on solar cells W located above and below the middle section of the passivation channel 432, thereby ensuring stable batch passivation.

[0086] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0087] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A passivation wafer boat, used for passivating the surface to be passivated (WC) of a cell (W), characterized in that: The passivation wafer boat comprises: A boat support (400) is provided with a receiving cavity (43) therein; the receiving cavity (43) includes: a passivation channel (432) for passing a passivation gas flow; a boat accommodating area (431), wherein a plurality of the boat accommodating areas (431) are provided; the plurality of the boat accommodating areas (431) are provided outside the passivation channel (432) along the movement route of the passivation airflow, and the plurality of the boat accommodating areas (431) surround the passivation channel (432); and A small boat (500), the small boat (500) being arranged in the small boat accommodating area (431); the small boat (500) being provided with a battery cell compartment (515) with an opening (5151), the battery cell compartment (515) being used to accommodate battery cells (W); the small boat (500) comprising a boat body (51) and a pressure plate unit (52), the pressure plate unit (52) comprising: a pressing plate (524), the pressing plate (524) being movably disposed in the battery cell compartment (515), and the pressing plate (524) and the boat body (51) together forming the outline of the opening (5151); an elastic member (523), the elastic member (523) being connected or abuttingly disposed between the pressure plate (524) and the boat body (51); a pull plate (521), the pull plate (521) being located outside the battery cell compartment (515); and A pull rod (522), the two ends of which are respectively connected to the pressure plate (524) and the pull plate (521); wherein the outline size of the opening (5151) is adjustable through the pull plate (521) and the elastic member (523); Each of the boat accommodating areas (431) accommodates one or several of the boats (500), the openings (5151) of the boats (500) in all the boat accommodating areas (431) face the passivation channel (432), and the surface (WC) to be passivated of the battery cell (W) is located at the opening (5151), so that the passivation airflow of the passivation channel (432) acts on the surface (WC) to be passivated of the battery cell (W).

2. The passivation wafer boat according to claim 1, wherein: The depth dimension of the battery cell compartment (515) from the opening (5151) inward is greater than or equal to the dimension L1 from the surface to be passivated (WC) of the battery cell (W) to the surface opposite to the surface to be passivated (WC), so that the surface to be passivated (WC) of the battery cell (W) accommodated in the battery cell compartment (515) and the end surface (5152) of the opening are flush or substantially flush; the width dimension of the opening (5151) is greater than or equal to the width dimension L2 of the surface to be passivated (WC) of the battery cell (W), and the width dimension of the opening (5151) is less than or equal to the width dimension L2+2mm of the surface to be passivated (WC) of the battery cell (W).

3. The passivation wafer boat according to claim 1, wherein: Two boat accommodating areas (431) are provided, and the two boat accommodating areas (431) are provided on opposite sides of the passivation channel (432).

4. The passivation wafer boat according to claim 1, wherein: The boat (500) is provided with an open end surface (5152) forming the opening (5151), and the open end surfaces (5152) of the plurality of boats (500) located in the same boat accommodating area (431) are in the same plane.

5. The passivation wafer boat according to claim 1, wherein: Adjacent boats (500) are arranged in close proximity.

6. The passivation wafer boat according to claim 1, wherein: The boat support (400) includes a frame (41), and the interior of the frame (41) includes a boat accommodating area (431) and a passivation channel (432); a side of the frame (41) facing the passivation channel (432) is a frame end face (413); A gap is maintained between the boat bodies (51) of adjacent boats (500), wherein part of the skeleton (41) is located in the gap between the adjacent boat bodies (51), and the gap is blocked by the skeleton (41), and the skeleton end face (413) of the skeleton (41) is flush or substantially flush with the opening end face (5152) of the opening (5151) of two adjacent boats (500).

7. The passivation wafer boat according to claim 1, wherein: The boat (500) includes a boat body (51) and an airflow baffle (53), wherein the airflow baffle (53) is connected to the outside of the boat body (51), and the boat body (51) is provided with the battery cell compartment (515); A gap is maintained between the boat bodies (51) of adjacent boats (500), wherein the airflow baffle (53) is used to block the gap between the adjacent boat bodies (51), and the baffle end face of the airflow baffle (53) is flush or substantially flush with the opening end faces (5152) of the openings (5151) of two adjacent boats (500).

8. The passivation wafer boat according to claim 1, wherein: The boat support (400) includes a frame (41), and the interior of the frame (41) includes a boat accommodating area (431) and a passivation channel (432); the frame (41) has a frame end surface (413) opposite to the passivation channel (432); the boat (500) further includes an airflow baffle (53), and the airflow baffle (53) is connected to the outside of the battery cell compartment (515); A gap is maintained between adjacent boats (500), wherein a portion of the skeleton (41) and the airflow baffle (53) are arranged in the gap between adjacent boats (500), and the skeleton end face (413) of the skeleton (41), the baffle end face of the airflow baffle (53) and the open end faces (5152) of two adjacent boats (500) are flush or substantially flush, and the above-mentioned gap is blocked by a portion of the skeleton (41) and the airflow baffle (53).

9. The passivation wafer boat according to claim 1, wherein: The wafer boat includes a frame (41), and the frame (41) includes: A skeleton body (411) for constructing the passivation channel (432) and the boat accommodating area (431); A reinforcing plate (412), the reinforcing plate (412) being a plate body with interactive holes (4121), the reinforcing plate (412) being located in the passivation channel (432), and the reinforcing plate (412) being arranged along the basic movement direction of the passivation airflow; the reinforcing plate (412) and the skeleton body (411) being connected so that the parts of the skeleton body (411) located at two positions of the passivation channel (432) form a whole; The interaction hole (4121) of the reinforcing plate (412) corresponds to the open end surface (5152) where the opening (5151) on the boat (500) is located, and the side wall of the interaction hole (4121) on the side of the open end surface (5152) is flush or substantially flush with the open end surface (5152).

10. The passivation wafer boat according to claim 1, wherein: The opening (5151) is located on the front side of the boat body (51), and the pulling plate (521) is located on the back side of the boat body (51); Alternatively, the opening (5151) is located on the front of the boat body (51), the pull plate (521) is located on the side of the boat body (51), and the pull plate (521) protrudes from the side of the boat body (51) in the direction of the passivation channel (432); an airflow baffle (53) or a boat support (400) is provided between the pull plate (521) and the passivation channel (432) for limiting the movement of the passivation airflow in the direction of the pull plate (521).

11. A passivation device, characterized in that: The passivation device comprises: A housing (100), wherein the housing (100) has a working space (11) therein; A passivation wafer boat according to any one of claims 1 to 10; the passivation wafer boat is arranged in the working space (11); an air intake assembly (200), the air intake assembly (200) being disposed in the workspace (11); and An air extraction component (300), wherein the air extraction component (300) is arranged in the working space (11); The air intake assembly (200) and the air extraction assembly (300) are respectively arranged on both sides of the movement route of the passivation airflow in the passivation channel (432), and the passivation airflow moves along the passivation channel (432) through the air intake assembly (200) and the air extraction assembly (300).

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