Battery piece edge passivation piece box and edge passivation equipment

Abstract

The invention discloses a battery piece edge passivation piece box and edge passivation equipment, and the battery piece edge passivation piece box comprises a box body made of a conductive material, the box body is recessed inwards to form a containing groove, one side in the containing groove is provided with a supporting plate, and the other side, opposite to the supporting plate, of the containing groove is provided with a fixing assembly which moves towards the supporting plate; the accommodating groove is used for placing a group of battery pieces which are tightly arranged in a matched manner, and the cutting surfaces of all the battery pieces face the opening of the accommodating groove; the fixing assembly is used for being matched with the supporting plate to compress and fix all the battery pieces; the side, facing the supporting plate, of the fixing assembly and the supporting plate are both made of insulating materials. In this way, the side, facing the supporting plate, of the fixing assembly and the non-cutting face, making contact with the supporting plate, of the battery piece cannot generate the winding plating phenomenon, and the conversion efficiency of the battery piece is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of solar cells, and in particular to a cell edge passivation box and an edge passivation device. Background Art

[0002] With the development of the photovoltaic industry, the technology of crystalline silicon cells has been updated and iterated. In the production of battery modules, the laser splitting technology is used to split the entire battery cell into two or more small pieces, which reduces the string current in the battery module and reduces the power loss of the series resistance. This is one of the important and effective ways to increase the power of photovoltaic modules.

[0003] However, laser cleavage is also accompanied by an impact on the conversion efficiency of the cell. Carrier recombination is more obvious on the newly cut surface of the cell (i.e., the unpassivated surface), and the impact of edge recombination on the conversion efficiency is more significant for high-efficiency cells. In order to eliminate or reduce the cell conversion efficiency loss caused by laser non-destructive cleavage (TLS) slicing, cell manufacturers will perform a coating passivation process on the edges of the newly cut sections of the cell cleavage, which can effectively reduce or eliminate the conversion efficiency loss caused by cell cleavage.

[0004] However, after the cut cells are subjected to edge passivation coating, the conversion efficiency of the solar cell is too low. Summary of the invention

[0005] The present invention provides a cell edge passivation box and an edge passivation device, which are used to solve the problem in the prior art that the conversion efficiency of the cell is too low after the cell is cut and edge passivation coating is performed.

[0006] The technical solution of the present invention is a battery cell edge passivation box, comprising a box body made of conductive material, the box body is recessed inward to form a receiving groove, a support plate is provided on one side of the receiving groove, and a fixing component moving toward the support plate is provided on the other side of the receiving groove opposite to the support plate;

[0007] The accommodating groove is used to match and place a group of closely arranged battery cells, and the cut surfaces of all battery cells face the opening of the accommodating groove; the fixing assembly is used to cooperate with the supporting plate to press and fix all battery cells;

[0008] Wherein, the side of the fixing component facing the supporting plate and the supporting plate are both made of insulating material.

[0009] Furthermore, the tops of both sides of the accommodating groove in the direction of limiting the lateral displacement of the fixing assembly are provided with detachable limiting plates, and the limiting plates are made of insulating material;

[0010] The top of the side of the fixing component facing the support plate and the top of the support plate are both higher than the bottom of the limiting plate; and the side of the fixing component facing the support plate, the support plate and the limiting plate can enclose to form a fixed space for fixing all battery cells.

[0011] Furthermore, a removable bottom plate is provided at the bottom of the accommodating groove, and the bottom plate is made of an insulating material; the bottom plate is used to cooperate with the limiting plate to change the volume of the fixed space for placing the battery cell.

[0012] Further, the fixing assembly includes a pressing plate, a guide rod and a grabbing member;

[0013] A pressing plate made of insulating material is provided on the other side of the accommodating groove away from the supporting plate, and a plurality of guide rods are provided on the pressing plate, and all the guide rods penetrate the side wall of the box body away from the supporting plate and are connected to the grabbing member;

[0014] The gripping member is used to connect to the manipulator, and the manipulator drives the pressing plate to move toward or away from the supporting plate.

[0015] Furthermore, each guide rod between the pressing plate and the corresponding side wall of the box body is sleeved with an elastic member.

[0016] Furthermore, a plurality of vertically arranged guide rods are respectively provided on both sides of the pressure plate along the direction of limiting the lateral displacement of the fixing assembly.

[0017] Furthermore, the gripping member has a connection interface adapted to the robot arm.

[0018] Furthermore, at least one first electrode rod and at least one second electrode rod are respectively disposed on the outer side walls of the box body on both sides of the direction in which the fixing assembly is limited to move laterally; and a first electrode plate and a second electrode plate are spaced apart on the upper side of the box body;

[0019] The first electrode rod and the second electrode rod are both used for conducting with the first electrode of the edge passivation boat; the first electrode plate and the second electrode plate are both used for conducting with the second electrode of the edge passivation boat.

[0020] Furthermore, the first electrode plate is located above the second electrode plate.

[0021] The present invention also provides an edge passivation device, which includes the above-mentioned battery cell edge passivation box.

[0022] Compared with the prior art, the present invention has at least the following beneficial effects:

[0023] When a group of closely arranged battery cells are matched and placed in the receiving groove of the present invention, the two sides of the battery cells along the Y-axis direction will abut against the inner side walls of the corresponding box body to prevent gaps between the two sides of the battery cells along the Y-axis direction and the inner side walls of the corresponding box body. At the same time, the fixing component will move toward the support plate to fix all the battery cells placed in the receiving groove to prevent the battery cells from shaking in the receiving groove and ensure the coating stability of the battery cells. The side of the fixing component facing the support plate and the support plate are made of insulating material to prevent unnecessary electrical contact and significantly reduce the local electric field strength around the corresponding battery cells, ensuring that the side of the fixing component facing the support plate and the non-cut surface of the battery cell in contact with the support plate will not be coated, thereby improving the conversion efficiency of the battery cell. The cut surface of the battery cell can be coated in a relatively stable and interference-free electric field environment, thereby ensuring the uniformity of the passivation coating on the cut surface of the battery cell, thereby improving the overall performance and reliability of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present invention; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present invention or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 This is a schematic diagram of the first structure of the cell edge passivation box proposed by the present invention;

[0027] Figure 2 This is a schematic diagram of the second structure of the cell edge passivation box proposed by the present invention;

[0028] Figure 3 A front view of an edge passivation boat according to the present invention.

[0029] Reference numerals:

[0030] 10. Box body; 101. First limiting member;

[0031] 20. Receiving groove;

[0032] 30. Pallet;

[0033] 40. fixing assembly; 401. pressing plate; 402. guide rod; 403. grabbing member; 404. elastic member; 405. connecting interface; 406. second limiting member;

[0034] 50. Restriction plate;

[0035] 60. Fixed space;

[0036] 70. A first electrode rod;

[0037] 80. A second electrode rod;

[0038] 90. A first electrode plate;

[0039] 100. a second electrode plate;

[0040] 110. Battery cell;

[0041] 120. Edge passivation boat. DETAILED DESCRIPTION

[0042] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the present invention, rather than implying that each embodiment of the present invention must have the described features. In addition, it should be noted that this specification describes many features. Although certain features can be combined together to illustrate possible system designs, these features can also be used in other combinations that are not explicitly described. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0043] The principle and structure of the present invention are described in detail below with reference to the accompanying drawings and embodiments.

[0044] Crystalline silicon cells in the photovoltaic industry use laser splitting technology to split the entire cell into two or more small pieces, reducing the string current in the battery module and reducing the power loss of the series resistance. This is one of the important and effective ways to increase the power of photovoltaic modules.

[0045] However, laser cleavage is also accompanied by an impact on the conversion efficiency of the cell. Carrier recombination is more obvious on the newly cut surface of the cell (i.e., the unpassivated surface), and the impact of edge recombination on the conversion efficiency is more significant for high-efficiency cells. In order to eliminate or reduce the cell conversion efficiency loss caused by laser non-destructive cleavage (TLS) slicing, cell manufacturers will perform a coating passivation process on the edges of the newly cut sections of the cell cleavage, which can effectively reduce or eliminate the conversion efficiency loss caused by cell cleavage.

[0046] However, after the cut cells are subjected to edge passivation coating, the conversion efficiency of the solar cell is too low.

[0047] Therefore, in order to solve the problem of low conversion efficiency of solar cells after edge passivation coating of cut cells, refer to the attached Figure 1-2 The present invention provides a cell edge passivation box, comprising a box body 10 made of a conductive material, the box body 10 is recessed inward to form a receiving groove 20, a support plate 30 is provided on one side of the receiving groove 20, and a fixing component 40 moving toward the support plate 30 is provided on the other side of the receiving groove 20 opposite to the support plate 30;

[0048] The accommodating groove 20 is used to match and place a group of closely arranged battery cells 110, and the cut surfaces of all battery cells 110 face the opening of the accommodating groove 20; the fixing assembly 40 is used to cooperate with the support plate 30 to press and fix all battery cells 110;

[0049] The side of the fixing assembly 40 facing the support plate 30 and the support plate 30 are both made of insulating material.

[0050] It should be noted that the box body 10 in this embodiment is provided with the support plate 30 and the fixing assembly 40 on opposite sides thereof in the X-axis direction of the box body 10, and the same shall apply throughout the text. The opening of the receiving groove 20 in this embodiment is located at the top of the box body 10; the cell 110 in this embodiment is illustrated by taking a cut crystalline silicon cell or solar cell as an example.

[0051] The cross-sectional shape of the box body 10 and the receiving groove 20 along the X-axis direction proposed in this embodiment can be rectangular, square, etc., as long as they can accommodate and fix the battery cell 110, and there is no limitation here. When the receiving groove 20 in this embodiment is full of battery cells 110, it is a group of battery cells 110, and the same applies throughout the text.

[0052] In this way, when a group of closely arranged battery cells 110 are matched and placed in the receiving groove 20, the two sides of the battery cells 110 along the Y-axis direction will abut against the inner side walls of the corresponding box body 10, preventing a gap from being left between the two sides of the battery cells 110 along the Y-axis direction and the corresponding inner side walls of the box body 10; at the same time, the fixing component 40 will move toward the support plate 30 to fix all the battery cells 110 placed in the receiving groove 20, prevent the battery cells 110 from shaking in the receiving groove 20, and ensure the coating stability of the battery cells 110; and to ensure that the side of the fixing component 40 facing the support plate 30 and the non-cut surface of the battery cell 110 in contact with the support plate 30 will not be circumvented by plating Phenomenon, the side of the fixing component 40 facing the support plate 30 and the support plate 30 are both made of insulating material, thereby preventing unnecessary electrical contact between the side of the fixing component 40 facing the support plate 30 and the support plate 30 and the battery cell 110, and significantly reducing the local electric field strength around the corresponding battery cell 110. In this way, when the cut surface of the battery cell 110 is subjected to passivation coating treatment, the cut surface of the battery cell 110 can be coated in a relatively stable and undisturbed electric field environment, thereby ensuring the uniformity of the passivation coating on the cut surface of the battery cell 110, improving the conversion efficiency of the battery cell 110, and further improving the overall performance and reliability of the battery cell 110.

[0053] In order to ensure that a group of battery cells 110 placed in the receiving groove 20 will not shake and ensure the stability of the battery cells 110 during passivation coating, refer to the attached Figure 1 , the tops of both sides of the accommodating groove 20 in the direction of limiting the lateral displacement of the fixing assembly 40 are provided with detachable limiting plates 50, and the limiting plates 50 are made of insulating material;

[0054] The top of the side of the fixing component 40 facing the tray 30 and the top of the tray 30 are both higher than the bottom of the limiting plate 50; and the side of the fixing component 40 facing the tray 30, the tray 30 and the limiting plate 50 can enclose to form a fixed space 60 for fixing all battery cells 110.

[0055] In order to ensure that the non-cut surface of the battery cell 110 in contact with the limiting plate 50 will not be subjected to the wrap-around plating phenomenon, the limiting plate 50 is made of an insulating material, thereby preventing unnecessary electrical contact between the limiting plate 50 and the battery cell 110, and significantly reducing the local electric field strength around the corresponding battery cell 110. In this way, when the cut surface of the battery cell 110 is subjected to the passivation coating treatment, the cut surface of the battery cell 110 can be coated in a relatively stable and undisturbed electric field environment, thereby ensuring the uniformity of the passivation coating on the cut surface of the battery cell 110, improving the conversion efficiency of the battery cell 110, and further improving the overall performance and reliability of the battery cell 110.

[0056] A removable bottom plate (not shown, same as above) is provided at the bottom of the receiving groove 20, which is made of insulating material; the bottom plate is used to cooperate with the limiting plate 50 to change the volume of the fixed space 60 for placing the battery cell 110, thereby improving the applicability of the battery cell edge passivation box, so that the receiving groove 20 of the battery cell edge passivation box can place battery cells 110 of different specifications and sizes. The specifications of the battery cells 110 that can be accommodated in the receiving groove 20 may include 182mm, 210mm, 230mm, etc., which are not limited in this embodiment.

[0057] It is understandable that the side of the fixing component 40 facing the support plate 30, the support plate 30, the limiting plate 50, and the bottom plate are all made of insulating materials. The insulating material may include ceramics, quartz, etc., as long as it can avoid the occurrence of the plating phenomenon, which is not limited here.

[0058] It should be noted that the direction for limiting the lateral displacement of the fixing assembly 40 proposed in this embodiment is the Y-axis direction of the box body 10 , and the same shall apply throughout the text.

[0059] When a group of battery cells 110 is placed in the receiving groove 20, there are the following two situations:

[0060] First, both sides of a group of battery cells 110 along the Y-axis direction will abut against the inner side walls of the corresponding box body 10. At this time, with the cooperation of the bottom plate, the tops of the group of battery cells 110 will extend out of the opening of the accommodating groove 20, and the extended length is equal to the thickness of the limiting plate 50, that is, the limiting plate 50 will not extend into the accommodating groove 20 at this time, so that the limiting plate 50 and the part of the group of battery cells 110 extending out of the accommodating groove 20 are aligned and fixed (that is, the top of the group of battery cells 110 is flush with the top of the limiting plate 50), to prevent a group of battery cells 110 from being blocked. The battery cells 110 are shaken along the Y-axis direction, while ensuring that only the cut surfaces (equivalent to the coated surfaces, the same throughout the text) of all the battery cells 110 are exposed, and the non-cut surfaces (equivalent to the non-coated surfaces, the same throughout the text) of all the battery cells 110 are respectively in contact with the inner side walls on both sides of the box body 10 in the direction of limiting the lateral displacement of the fixing component 40, the side of the fixing component 40 facing the support plate 30, the support plate 30 and the limiting plate 50, effectively preventing the non-cut surfaces of the battery cells 110 from undergoing wrap-around plating, thereby ensuring that the conversion efficiency of the battery cells 110 will not be reduced.

[0061] At the same time, the bottom plate, the limiting plate 50, the side of the fixing assembly 40 facing the support plate 30 and the support plate 30 can enclose a fixed space 60 for fixing all the battery cells 110, preventing the battery cells 110 from shaking during edge passivation coating, thereby ensuring the coating stability of the battery cells 110.

[0062] Secondly, both sides of a group of battery cells 110 along the Y-axis direction do not abut against the inner side walls of the corresponding box body 10, and the height of a group of battery cells 110 does not extend out of the opening of the receiving groove 20. In this case, a thicker bottom plate needs to be replaced so that the top of the group of battery cells 110 placed in the receiving groove 20 will partially extend out of the opening of the receiving groove 20; at the same time, a wider limiting plate 50 needs to be replaced, that is, the limiting plate 50 at this time will extend into the receiving groove 20, so that the limiting plate 50 and the part of the group of battery cells 110 extending out of the receiving groove 20 are aligned and fixed (that is, the top of the group of battery cells 110 The top of the limiting plate 50 is flush with the top of the limiting plate 50), ensuring that only the cut surface of one group of battery cells 110 is exposed, and the four sides of the cut surface of one group of battery cells 110 are respectively in contact with the side of the fixing component 40 facing the support plate 30, the support plate 30 and the limiting plate 50, preventing the process gas from flowing into the accommodating groove 20 from the gap between the side of the fixing component 40 facing the support plate 30, the support plate 30, the limiting plate 50 and a group of battery cells 110 and contacting the non-cut surface of the battery cell 110, effectively preventing the non-cut surface of the battery cell 110 from generating a plating-around phenomenon, thereby ensuring that the conversion efficiency of the battery cell 110 will not be reduced.

[0063] Moreover, the bottom plate and the limiting plate 50 are both made of insulating materials, thereby preventing unnecessary electrical contact between the bottom plate, the limiting plate 50 and the battery cell 110, and significantly reducing the local electric field strength around the corresponding battery cell 110. In this way, when the cut surface of the battery cell 110 is subjected to passivation coating treatment, the cut surface of the battery cell 110 can be coated in a relatively stable and undisturbed electric field environment, thereby ensuring the uniformity of the passivation coating on the cut surface of the battery cell 110, thereby improving the overall performance and reliability of the battery cell 110.

[0064] Of course, in some embodiments, to prevent the battery cell 110 from being damaged, a buffer layer made of silicone is provided on the side of the fixing assembly 40 facing the support plate 30 and at the contact position between the support plate 30 and the limiting plate 50 and the non-cut surface of the battery cell 110 .

[0065] Among them, refer to the attached Figure 1 , this embodiment proposes a fixing assembly 40 composed of:

[0066] The fixing assembly 40 includes a pressing plate 401, a guide rod 402 and a grabbing member 403;

[0067] A pressing plate 401 made of insulating material is provided on the other side of the accommodating groove 20 away from the supporting plate 30. A plurality of guide rods 402 are provided on the pressing plate 401. All the guide rods 402 penetrate the side wall of the box body 10 away from the supporting plate 30 and are connected to the grabbing member 403.

[0068] The gripping member 403 is used to connect to a robot arm, and drives the pressing plate 401 to move toward or away from the supporting plate 30 through the robot arm.

[0069] It should be noted that the top of the pressing plate 401 and the top of the supporting plate 30 are both higher than the bottom of the limiting plate 50 . Of course, the top of the pressing plate 401 and the top of the supporting plate 30 can also be flush with the top of the limiting plate 50 .

[0070] In this way, when a group of cells 110 are matched and placed in the accommodating groove 20, the control unit of the edge coating equipment will control the gripper 403 to move toward the pallet 30 through the manipulator, thereby driving the pressing plate 401 to move toward the pallet 30, and finally fix a group of cells 110 between the pressing plate 401 and the pallet 30 to prevent the cells 110 from shaking along the X-axis direction of the box body 10 during edge passivation coating, thereby ensuring the coating stability of the cells 110. If the cell 110 needs to be removed after the passivation coating is completed, the control unit will control the manipulator to drive the gripper 403 to move away from the pallet 30, thereby causing the pressing plate 401 to move away from the pallet 30.

[0071] In order to absorb the impact energy when the manipulator drives the gripper 403 to move and reduce the impact of direct collision, refer to the attached Figure 1 Each guide rod 402 between the pressing plate 401 and the corresponding side wall of the box body 10 is sleeved with an elastic member 404; and the elastic member 404 is preferably a compression spring.

[0072] In this way, when the manipulator controls the grabbing member 403 to move toward the support plate 30, the elastic member 404 is compressed; and when the manipulator drives the grabbing member 403 to move away from the support plate 30, the elastic member 404 recovers due to its own elastic deformation.

[0073] In order to make the gripping member 403 drive the pressing plate 401 to move more stably, refer to the attached Figure 2 Two vertically arranged guide rods 402 are respectively provided on both sides of the pressure plate 401 along the direction of limiting the lateral displacement of the fixing assembly 40.

[0074] Specifically, a first limiting member 101 is provided on the outer wall of the box body 10 facing the grabbing member 403 and corresponding to each guide rod 402, and a second limiting member 406 is provided on the side of the pressure plate 401 facing the grabbing member 403 and corresponding to each guide rod 402, so that the guide rod 402 on the pressure plate 401 passes through the second limiting member 406, the corresponding side wall of the box body 10, and the first limiting member 101 in sequence, and then is connected to the grabbing member 403, ensuring that the guide rod 402 will not be offset under the action of the first limiting member 101 and the second limiting member 406.

[0075] Among them, refer to the attached Figure 1 The gripping member 403 has a connection interface 405 adapted to the manipulator, and the connection interface 405 is used to connect to the manipulator.

[0076] In this way, when it is necessary to push the grabbing member 403, thereby driving the pressure plate 401 to move toward the support plate 30, so as to fix a group of battery cells 110 between the pressure plate 401 and the support plate 30 and perform passivation coating, the robot will quickly connect to the connection interface 405 and push the grabbing member 403; and if the passivation coating is completed and it is necessary to remove a group of battery cells 110 that have been passivated and coated in the accommodating groove 20, the control unit will control the robot to drive the grabbing member 403 to move away from the support plate 30, thereby causing the pressure plate 401 to move away from the support plate 30.

[0077] Among them, refer to the attached Figure 3 A first electrode rod 70 and a second electrode rod 80 are respectively provided on the outer side walls of the box body 10 on both sides of the direction in which the fixing assembly 40 is limited to move laterally; a first electrode plate 90 and a second electrode plate 100 are spaced apart above the box body 10; and the first electrode plate 90 and the second electrode plate 100 are spaced apart and connected by bolts.

[0078] The first electrode rod 70 and the second electrode rod 80 are both electrically connected to the first electrode of the edge passivation boat 120 ; the first electrode plate 90 and the second electrode plate 100 are electrically connected to the second electrode of the edge passivation boat 120 .

[0079] It can be understood that, in this embodiment, the first electrode of the edge passivation boat 120 is a negative electrode, and the second electrode is a positive electrode.

[0080] Specifically, the first electrode rod 70 and the second electrode rod 80 are both conductively connected to the negative electrode of the lower frame of the edge passivation boat 120 ; the first electrode plate 90 and the second electrode plate 100 are both conductively connected to the positive electrode of the upper frame of the edge passivation boat 120 .

[0081] In this way, by connecting the first electrode and the second electrode of the edge passivation boat 120 to the corresponding AC power supply, an alternating electric field can be formed on the top of the box body 10, so that the plasma generated by the alternating electric field acts on the cut surface of the battery cell 110 on the top of the box body 10, thereby passivating the cut surface of the battery cell 110. The first electrode rod 70 and the second electrode rod 80 can also be used to support the box body 10 on the lower boat frame of the edge passivation boat 120.

[0082] In order to ensure that the alternating electric field formed between the first electrode plate 90 and the top of the box body 10 can better passivate the cut surface of the battery cell 110 , the first electrode plate 90 is located above the second electrode plate 100 .

[0083] The present invention also provides an edge passivation device, which includes the above-mentioned battery cell edge passivation box.

[0084] Among them, refer to the attached Figure 3The edge passivation equipment also includes an edge passivation boat 120, in which a plurality of cell edge passivation boxes are placed, and then the edge passivation boat 120 is fed into the cavity of the coating reaction chamber by the automatic feeding and picking mechanism of the edge passivation equipment, so that the cut surface of a group of cells 110 in the cell edge passivation box adopts ALD (atomic layer deposition, Atomic Layer Deposition) + PECVD (Plasma Enhanced Chemical Vapor Deposition, Plasma Enhanced Chemical Vapor Deposition) process, and under the same working conditions in the coating reaction chamber, the process route of compounding various passivation films is completed at one time.

[0085] Of course, in other embodiments, according to actual conditions, the cut surfaces of a group of battery cells 110 in the battery cell edge passivation box can be subjected to deposition of silicon nitride film, annealing process, etc. in the coating reaction chamber to achieve the superposition of multiple processes, so that the cut surfaces of the battery cells 110 can achieve better passivation effect, thereby effectively reducing and repairing the conversion efficiency loss after the entire battery cell is cracked.

[0086] A first electrode rod 70 and a second electrode rod 80 are respectively provided on the outer side walls of the box body 10 on both sides of the direction in which the fixing assembly 40 is limited to move laterally; a first electrode plate 90 and a second electrode plate 100 are provided at intervals on the edge passivation boat 120 located above the box body 10; and the first electrode plate 90 is located above the second electrode plate 100, and the first electrode plate 90 and the second electrode plate 100 are connected at intervals by bolts.

[0087] The first electrode rod 70 and the second electrode rod 80 are both connected to the negative electrode of the lower frame of the edge passivation boat 120 ; the first electrode plate 90 and the second electrode plate 100 are both connected to the positive electrode of the upper frame of the edge passivation boat 120 .

[0088] In this way, by connecting the positive electrode and the negative electrode of the edge passivation boat 120 to the corresponding AC power supply, an alternating electric field can be formed on the top of the box body 10, so that the plasma generated by the alternating electric field acts on the cut surface of the battery cell 110 on the top of the box body 10, thereby passivating the cut surface of the battery cell 110. The first electrode rod 70 and the second electrode rod 80 can also be used to support the box body 10 on the lower boat frame of the edge passivation boat 120.

[0089] Of course, to ensure that an alternating electric field is formed between the first electrode plate 90 and the top of the box body 10, the cut surface of the battery cell 110 can be better passivated. The first electrode plate 90 and the second electrode plate 100 above all battery cell edge passivation boxes in the same edge passivation boat 120 are integrally formed.

[0090] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to replace some of the technical features therein with equivalents. Any equivalent structure made using the contents of the specification and drawings of the present invention, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present invention.

Claims

1. A cell edge passivation box, characterized in that: The invention comprises a box body (10) made of a conductive material, wherein the box body (10) is recessed inwardly to form a receiving groove (20), a support plate (30) is provided on one side of the receiving groove (20), and a fixing component (40) movable toward the support plate (30) is provided on the other side of the receiving groove (20) relative to the support plate (30); The accommodating groove (20) is used to match and place a group of closely arranged battery cells (110), and the cut surfaces of all the battery cells (110) face the opening of the accommodating groove (20); the fixing assembly (40) is used to cooperate with the supporting plate (30) to press and fix all the battery cells (110); Wherein, the side of the fixing assembly (40) facing the support plate (30) and the support plate (30) are both made of insulating material.

2. The cell edge passivation box according to claim 1, characterized in that: The tops of both sides of the accommodating groove (20) in the direction of limiting the lateral displacement of the fixing assembly (40) are provided with detachable limiting plates (50), and the limiting plates (50) are made of insulating material; The top of the side of the fixing component (40) facing the support plate (30) and the top of the support plate (30) are both higher than the bottom of the limiting plate (50); and the side of the fixing component (40) facing the support plate (30), the support plate (30) and the limiting plate (50) can enclose to form a fixing space (60) for fixing all the battery cells (110).

3. The cell edge passivation box according to claim 2, characterized in that: A detachable bottom plate is provided at the bottom of the accommodating groove (20), and the bottom plate is made of an insulating material; the bottom plate is used to cooperate with the limiting plate (50) to change the volume of the fixed space (60) for placing the battery cell (110).

4. The cell edge passivation box according to any one of claims 1 to 3, characterized in that: The fixing assembly (40) comprises a pressing plate (401), a guide rod (402) and a grabbing member (403); A pressing plate (401) made of an insulating material is provided on the other side of the containing groove (20) away from the supporting plate (30), and a plurality of guide rods (402) are provided on the pressing plate (401), and all the guide rods (402) penetrate the side wall of the box body (10) away from the supporting plate (30) and are connected to the grabbing member (403); The grabbing member (403) is used to connect to a robot arm, and the robot arm drives the pressing plate (401) to move toward or away from the supporting plate (30).

5. The cell edge passivation box according to claim 4, characterized in that: Each guide rod (402) located between the pressing plate (401) and the corresponding side wall of the box body (10) is sleeved with an elastic member (404).

6. The cell edge passivation box according to claim 4, characterized in that: A plurality of vertically arranged guide rods (402) are respectively provided on both sides of the pressure plate (401) along the direction of limiting the lateral displacement of the fixing assembly (40).

7. The cell edge passivation box according to claim 4, characterized in that: The gripping member (403) has a connection interface (405) adapted to a robot arm.

8. The cell edge passivation box according to claim 1, characterized in that: At least one first electrode rod (70) and at least one second electrode rod (80) are respectively provided on the outer side walls of the box body (10) on both sides of the direction in which the fixed assembly (40) is limited to move laterally; a first electrode plate (90) and a second electrode plate (100) are spaced apart above the box body (10); The first electrode rod (70) and the second electrode rod (80) are both used to conduct with the first electrode of the edge passivation boat (120); the first electrode plate (90) and the second electrode plate (100) are both used to conduct with the second electrode of the edge passivation boat (120).

9. The cell edge passivation box according to claim 8, characterized in that: The first electrode plate (90) is located above the second electrode plate (100).

10. An edge passivation device, characterized in that: The edge passivation device comprises the cell edge passivation box according to any one of claims 1 to 9.

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