Repairing tool, repairing method, and repairing device

Abstract

The application relates to a repair welding tool, a repair welding method and a repair welding device. The repair welding tool is used for a battery monomer. The battery monomer comprises a top cover and a first sealing piece, the top cover is provided with a liquid injection hole, and the first sealing piece is sealingly connected to the top of the liquid injection hole. The repair welding tool comprises a tool body and a tool head, the tool head is connected to the tool body, and the end, away from the tool body, of the tool head is provided with a blade opening part matched with the liquid injection hole. The welding process of the first sealing piece can be used, and the rework efficiency and yield of the repair welding operation can be effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a tool for repair welding, a repair welding method and a repair welding device. BACKGROUND

[0002] In the related art, the manufacturing process of a battery cell usually includes a process of welding a sealing member at a liquid injection hole to seal the liquid injection hole. In the welding process, defects such as weld depression may occur on the sealing member in some cases. The repair welding method is usually used to solve this defect. However, the rework efficiency of the conventional repair welding method is low. SUMMARY

[0003] Therefore, it is necessary to provide a tool for repair welding, a repair welding method and a repair welding device to solve the problem of low rework efficiency of the conventional repair welding method.

[0004] According to a first aspect of the present application, a tool for repair welding is provided for a battery cell. The battery cell includes a top cover and a first sealing member, and the top cover is provided with a liquid injection hole penetrating therethrough, and the first sealing member is sealingly connected to the top of the liquid injection hole. The tool for repair welding includes a tool body and a tool head, and the tool head is connected to the tool body, and an edge portion adapted to the liquid injection hole is arranged at an end of the tool head away from the tool body.

[0005] In the technical solution of the present application, the tool head of the tool for repair welding is provided with the edge portion adapted to the liquid injection hole. Therefore, in the process of using the tool for repair welding to perform repair welding on the battery cell, a cut adapted to the edge portion can be formed at the liquid injection hole of the battery cell to remove the first sealing member with defects, and the cut can also be roughly corresponding to the original structure of the liquid injection hole, so that the welding process of the first sealing member can be used to perform repair welding of the second sealing member with the same structure as the first sealing member at the cut. In this process, the volume of the removed part is small due to the adaptation of the edge portion to the liquid injection hole, and the welding process of the first sealing member can effectively improve the rework efficiency and yield of the repair welding.

[0006] In one of the embodiments, the liquid injection hole includes a first hole section configured as a stepped hole, the first sealing member is sealingly connected to the first hole section, and the edge portion includes a stepped portion adapted to the first hole section. In the process of using the tool for repair welding to perform repair welding on the battery cell, the feed stroke of the tool for repair welding along the axial direction of the liquid injection hole can be adjusted according to the stroke required when the tool for repair welding is fed to the stepped hole and the stepped portion to adapt to abutment, so as to better control the feed stroke of the tool for repair welding along the axial direction of the liquid injection hole, which is conducive to improving the cutting accuracy of the tool for repair welding and reducing the volume of the removed part, thereby improving the rework efficiency of the repair welding.

[0007] In one of the embodiments, the stepped portion comprises a first cutting surface and a second cutting surface arranged around the first cutting surface, the first hole section has a stepped surface, the first cutting surface is configured to abut against the stepped surface of the first hole section along the axial direction of the liquid injection hole, and the second cutting surface is configured to extend outwardly and obliquely from one end thereof close to the first cutting surface to the other end. The second cutting surface of the stepped portion can form a tapered surface in cooperation with the notch, and the original structure of the first liquid injection hole can be retained to the greatest extent. Compared with a conventional tool with a uniform radial dimension, the volume of the part to be cut and removed can be greatly reduced by using the tool for repair welding, thereby improving the rework efficiency of the repair welding operation.

[0008] In one of the embodiments, the cross section of the tool head in the direction perpendicular to the axial direction of the tool head is configured as a circular ring. During the repair welding operation of the battery monomer by using the tool head with the circular ring structure, the tool for repair welding can be driven to rotate around the central axis of the liquid injection hole by a small angle, such as about 10 degrees, to remove the first sealing member on the battery monomer, thereby further improving the rework efficiency of the repair welding operation.

[0009] In one of the embodiments, the tool for repair welding comprises at least two tool heads connected to the outer peripheral wall of the tool body, and the at least two tool heads are arranged at intervals in the circumferential direction of the tool body. The at least two tool heads can improve the removal efficiency of the first sealing member, thereby improving the rework efficiency of the repair welding operation.

[0010] In one of the embodiments, the tool head is provided with a high-temperature-resistant coating. The tool head provided with the high-temperature-resistant coating can reduce burrs or sticking of the tool head due to the cutting process in the dry machining (without cooling liquid), thereby prolonging the service life of the tool for repair welding.

[0011] In one of the embodiments, the high-temperature-resistant coating comprises at least one of a titanium nitride coating, a titanium carbonitride coating, a titanium aluminum nitride coating, a chromium aluminum nitride coating, and a diamond coating.

[0012] In one of the embodiments, the tool head comprises a milling tool head, a reamer tool head, or a boring tool head. The milling tool head, the reamer tool head, or the boring tool head facilitates the removal of the first sealing member, thereby improving the removal efficiency of the first sealing member and further improving the rework efficiency of the repair welding operation.

[0013] According to a second aspect of the present application, a patching method is provided for processing a battery cell by using the patching tool according to any of the above embodiments. The patching method comprises: cutting the connection between the first sealing member and the liquid injection hole of the battery cell by using the patching tool to remove the first sealing member; and welding a second sealing member at the liquid injection hole; wherein the first sealing member and the second sealing member have the same structure. The patching operation can be performed by using the second sealing member having the same structure as the first sealing member, and the second sealing member is welded at the cutout. In this way, the welding process of the first sealing member can be used, and the rework efficiency and yield of the patching operation can be improved.

[0014] In one of the embodiments, before the second sealing member is welded at the liquid injection hole, the patching method further comprises: cleaning the liquid injection hole. The cutting waste generated by removing the first sealing member can be cleaned at the liquid injection hole, so that the second sealing member can be better welded at the liquid injection hole, i.e., welded at the cutout.

[0015] In one of the embodiments, the cleaning of the liquid injection hole specifically comprises: performing a blowing process towards the liquid injection hole, and adsorbing and cleaning the liquid injection hole. On the one hand, the cutout formed by cutting at the liquid injection hole can be cooled by using the blowing process; the cutting waste formed at the cutout can be blown to a place by using the blowing process, so that the cutting waste blown to the place can be uniformly adsorbed and treated, the damage to the battery cell caused by the cleaning method such as a brush or alcohol can be reduced, and the battery cell can be effectively protected while the liquid injection hole is effectively cleaned.

[0016] In one of the embodiments, the cleaning of the liquid injection hole further comprises: cleaning the liquid injection hole by using a laser. The cutting waste in a small amount remaining at the cutout can be removed by using the laser cleaning method, the cleanliness of the cutout is improved, and the patching yield of the second sealing member is further improved.

[0017] According to a third aspect of the present application, a patching device is provided. The patching device comprises the patching tool according to any of the above embodiments and a welding mechanism. The welding mechanism is used for welding a second sealing member at a liquid injection hole.

[0018] In one of the embodiments, the patching device further comprises a blowing mechanism, which is used for performing a blowing process towards the liquid injection hole in the case of removing the first sealing member.

[0019] In one of the embodiments, the patching device further comprises a laser cleaning mechanism, which is used for cleaning the liquid injection hole. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 FIG. 1 is a schematic view of a partial structure of a battery cell according to an embodiment of the present application.

[0021] Figure 2 FIG. 2 is a schematic view of a partial structure of a battery cell according to another embodiment of the present application.Figure 1 An enlarged schematic view of B in FIG. 1.

[0022] Figure 3 A schematic view of a structure of a repair welding tool according to an embodiment of the present application.

[0023] Figure 4 A schematic view of a structure of a repair welding tool and a top cover according to an embodiment of the present application.

[0024] Figure 5 A schematic view of a process of repairing a battery cell by using a repair welding tool according to an embodiment of the present application.

[0025] Figure 6 A schematic view of a structure of a repair welding tool according to another embodiment of the present application.

[0026] Figure 7 A schematic view of a structure of a repair welding tool according to still another embodiment of the present application.

[0027] Figure 8 A schematic view of a structure of a repair welding tool, a blowing mechanism and a battery cell according to an embodiment of the present application.

[0028] Figure 9 A schematic view of a process of repairing a battery cell by using a welding mechanism according to an embodiment of the present application.

[0029] Figure 10 A schematic view of a process of cleaning a battery cell to be repaired by using a laser cleaning mechanism according to an embodiment of the present application.

[0030] Reference signs: 100, repair welding tool; 110, tool body; 120, tool head; 121, blade portion; 1211, first cutting surface; 1212, second cutting surface;

[0031] 200, battery cell; 210, top cover; 220a, first sealing member; A, liquid injection hole; A1, first hole section; A11, step surface; A2, second hole section; 220b, second sealing member; 230, bottom shell; 300, welding mechanism; 400, blowing mechanism; 500, laser cleaning mechanism. DETAILED DESCRIPTION

[0032] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, a lot of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many different ways other than those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0033] In the description of the application, it should be understood that, if there are these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0034] In addition, if there are these terms "first", "second", these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this application, unless otherwise explicitly specified and limited, if there are terms such as "mounting", "connecting", "connecting", "fixing" and the like, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0036] In this application, unless otherwise explicitly specified and limited, if there are similar descriptions such as "first feature on or under second feature", the meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0037] It should be noted that if an element is referred to as being "fixed" or "set" on another element, it can be directly on the other element or there can be an intervening element. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. If present, the terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar expressions as used herein are for purposes of description and not of limitation, unless otherwise indicated.

[0038] As described in the background, the welding defects such as weld depression on the seal are usually solved by repair welding.

[0039] In the traditional repair welding method, in the process of removing the seal with defects, a part of the side wall of the liquid injection hole is usually cut off, causing a large amount of metal to be removed, thereby causing the rework efficiency of the traditional repair welding method to be low; at the same time, it also causes the radial size of the liquid injection hole to increase, thereby causing a larger seal to be customized to be welded at the liquid injection hole, which will cause the cost of the customized seal to be additionally increased, and the repair welding process of the larger seal will still follow the original welding process of the seal, causing the repair welding of the larger seal to be prone to poor welding.

[0040] In order to solve at least one of the above technical problems, the present application designs a repair welding tool, a repair welding method and a repair welding device, which can remove the seal with defects by using the repair welding tool, while also being beneficial to maintaining the original structure of the liquid injection hole, facilitating the use of the same size seal for repair welding, improving the repair welding efficiency, while also being beneficial to ensuring the consistency of the welding process, thereby improving the yield of repair welding.

[0041] The repair welding tool, the repair welding method and / or the repair welding device disclosed in the embodiments of the present application can be used in the production process of the battery, but are not limited thereto.

[0042] Figure 1 A partial structure schematic diagram of a battery monomer 200 of an embodiment of the present application is shown, Figure 2 For Figure 1 An enlarged schematic diagram of B of the above.

[0043] The repair welding tool 100 provided by an embodiment of the present application is used for the battery monomer 200.

[0044] Please refer to Figure 1 and 2 The battery monomer 200 includes a top cover 210 and a first seal 220a, the top cover 210 is provided with a liquid injection hole A, and the first seal 220a is sealingly connected to the top of the liquid injection hole A.

[0045] The first sealing member 220a is substantially in the shape of a cap, and the liquid injection hole A can be sealed by the first sealing member 220a, thereby improving the sealing reliability of the battery monomer 200.

[0046] Please refer to Figure 3 and refer to Figure 4 and Figure 5 The repair welding tool 100 comprises a tool body 110 and a tool head 120, the tool head 120 is connected to the tool body 110, and the end of the tool head 120 away from the tool body 110 is provided with a blade portion 121 matched with the liquid injection hole A.

[0047] In use, the repair welding tool 100 is usually driven by a driving mechanism to rotate around the central axis of the liquid injection hole A and to move along the axial direction of the liquid injection hole A towards the side close to the liquid injection hole A, so as to cut the liquid injection hole A by the repair welding tool 100.

[0048] The tool body 110 refers to the part of the repair welding tool 100 connected to the driving mechanism, and the tool body 110 can be in the shape of a column to facilitate connection with the driving mechanism, so that the repair welding tool 100 is driven by the driving mechanism to rotate around the central axis of the liquid injection hole A and to move along the axial direction of the liquid injection hole A towards the side close to the liquid injection hole A. Alternatively, the tool body 110 is in the shape of a cylinder.

[0049] The tool head 120 refers to the part of the repair welding tool 100 used to cut the connection between the first sealing member 220a and the liquid injection hole A.

[0050] The blade portion 121 refers to the relatively sharp part of the tool head 120, which is used to form a cut corresponding to the blade portion 121 at the connection between the first sealing member 220a and the liquid injection hole A.

[0051] The blade head 120 of the repair welding tool 100 is provided with a blade edge portion 121 matched with the liquid injection hole A. During the repair welding operation of the battery monomer 200 by the repair welding tool 100, a cut matched with the blade edge portion 121 can be formed at the liquid injection hole A of the battery monomer 200, so that the first sealing member 220a with defects can be removed, and the cut can be matched with the original structure of the liquid injection hole A. Then, the second sealing member 220b with the same structure as the first sealing member 220a can be welded at the cut by using the welding process of the first sealing member 220a. During the process, the volume of the removed part is small due to the matching between the blade edge portion 121 and the liquid injection hole A, and the welding process of the first sealing member 220a can effectively improve the rework efficiency and yield of the repair welding operation. In addition, the repair welding tool 100 of the present application can be used for the repair welding operation of the second sealing member 220b, and the second sealing member 220b can be manufactured by the same manufacturing process as the first sealing member 220a, so that the cost of customizing a larger sealing nail can be saved, and the cost of the repair welding operation can be reduced to a certain extent.

[0052] It should be noted that the second sealing member 220b can be manufactured by the same manufacturing process as the first sealing member 220a, that is, the second sealing member 220b and the first sealing member 220a can be sealing members in the same batch.

[0053] In some embodiments, the liquid injection hole A includes a first hole section A1 configured as a stepped hole, and the first sealing member 220a is sealingly connected to the first hole section A1. The blade edge portion 121 includes a stepped portion matched with the first hole section A1.

[0054] The first hole section A1 of the liquid injection hole A is configured as a stepped hole, and the blade edge portion 121 includes a stepped portion matched with the first hole section A1. During the repair welding operation of the battery monomer 200 by the repair welding tool 100, the feed stroke of the repair welding tool 100 along the axial direction of the liquid injection hole A can be adjusted according to the stroke required when the repair welding tool 100 is fed to the stepped hole and the stepped portion to be matched and abutted, so that the feed stroke of the repair welding tool 100 along the axial direction of the liquid injection hole A can be better controlled, which is beneficial to improve the cutting accuracy of the repair welding tool 100 and reduce the volume of the removed part, thereby improving the rework efficiency of the repair welding operation. In the present embodiment, the liquid injection hole A further includes a second hole section A2 communicated with the bottom end of the first hole section A1, and the battery monomer 200 includes a sealing column (not shown in the figure) sealingly connected to the second hole section A2.

[0055] The sealing column seals the second hole section A2 of the liquid injection hole A, and the first sealing member 220a seals the first hole section A1 of the liquid injection hole A, so that the double sealing of the liquid injection hole A is realized. In the process of the repair welding operation of the second sealing member 220b, the cutting waste generated in the process of removing the first sealing member 220a (the first sealing member 220a with defects) by the repair welding tool 100 will not enter the battery monomer 200 through the liquid injection hole A, which facilitates the repair welding operation.

[0056] In some embodiments, the stepped portion includes a first cutting surface 1211 and a second cutting surface 1212 arranged around the first cutting surface 1211, and the first hole section A1 has a stepped surface A11, the first cutting surface 1211 is configured to abut the stepped surface A11 of the first hole section A1 along the axial direction of the liquid injection hole A, and the second cutting surface 1212 is configured to extend outwardly and obliquely from one end close to the first cutting surface 1211 to the other end.

[0057] In this way, the feed stroke of the repair welding tool 100 along the axial direction of the liquid injection hole A can be adjusted so that the repair welding tool 100 can stop feeding when the first cutting surface 1211 abuts the stepped surface A11 of the first hole section A1 along the axial direction of the liquid injection hole A.

[0058] The second cutting surface 1212 is configured to extend outwardly and obliquely from one end close to the first cutting surface 1211 to the other end, and the blade edge portion 121 includes a stepped portion matched with the first hole section A1. In this way, the blade edge portion 121 can be well utilized to form a notch matched with the blade edge portion 121 at the first hole section A1 of the battery monomer 200 to remove the first sealing member 220a with defects, and the notch can also be matched with the original structure of the first hole section A1. The second cutting surface 1212 of the stepped portion can form a conical surface with the notch to maximize the preservation of the original structure of the first hole section A1. Compared with the traditional tool with consistent radial dimension, the repair welding tool 100 can greatly reduce the volume of the removed part, thereby improving the rework efficiency of the repair welding operation.

[0059] In some embodiments, referring to Figures 3-5 In the axial direction perpendicular to the tool head 120, the cross section of the tool head 120 is configured as a circular ring.

[0060] In the process of the repair welding operation of the battery monomer 200 by the circular ring structure of the tool head 120, the repair welding tool 100 can be driven to rotate around the central axis of the liquid injection hole A by a small angle, such as about 10 degrees, to remove the first sealing member 220a (the first sealing member 220a with defects) on the battery monomer 200, which is conducive to further improving the rework efficiency of the repair welding operation.

[0061] In other embodiments, please refer to Figure 6 The repair welding tool 100 includes at least two tool heads 120 connected to the outer peripheral wall of the tool body 110, and the at least two tool heads 120 are arranged at intervals along the circumference of the tool body 110.

[0062] Taking the example that the repair welding tool 100 includes two tool heads 120 arranged at intervals along the circumference of the tool body 110, in the process of performing the repair welding operation on the battery monomer 200 by using the repair welding tool 100, the repair welding tool 100 can be driven to rotate 180 degrees around the central axis of the liquid injection hole A, so as to remove the first sealing member 220a (the first sealing member 220a with defects) on the battery monomer 200, which is conducive to further improving the rework efficiency of the repair welding operation.

[0063] It can be understood that the at least two tool heads 120 can improve the removal efficiency of the first sealing member 220a (the first sealing member 220a with defects), and further improve the rework efficiency of the repair welding operation.

[0064] Of course, the present application is not limited to this, and in the process of performing the repair welding operation on the battery monomer 200 by using the repair welding tool 100, the repair welding tool 100 can be driven to rotate 360 degrees around the central axis of the liquid injection hole A to remove the first sealing member 220a (the first sealing member 220a with defects). For example, as shown in the embodiment shown in Figure 7 , it is necessary to rotate the repair welding tool 100 360 degrees around the central axis of the liquid injection hole A to remove the first sealing member 220a (the first sealing member 220a with defects).

[0065] In some embodiments, the tool head 120 is provided with a high-temperature-resistant coating.

[0066] The high-temperature-resistant coating refers to a coating that can maintain good structure and strength at a temperature of 1000-1200°C.

[0067] The tool head 120 is provided with a high-temperature-resistant coating, which can reduce the burrs or sticking phenomenon on the tool head 120 due to the cutting process in the dry machining (without cooling liquid), and can improve the service life of the repair welding tool 100.

[0068] In some embodiments, the high-temperature-resistant coating includes at least one of a titanium nitride coating, a titanium carbonitride coating, a titanium aluminum nitride coating, a chromium aluminum nitride coating, and a diamond coating.

[0069] The high-temperature resistant coating may include one of the following: titanium nitride coating, titanium carbonitride coating, titanium aluminum nitride coating, chromium aluminum nitride coating, and diamond coating; or two of the following: titanium nitride coating, titanium carbonitride coating, titanium aluminum nitride coating, chromium aluminum nitride coating, and diamond coating; or three of the following: titanium nitride coating, titanium carbonitride coating, titanium aluminum nitride coating, chromium aluminum nitride coating, and diamond coating; or four of the following: titanium nitride coating, titanium carbonitride coating, titanium aluminum nitride coating, chromium aluminum nitride coating, and diamond coating; or titanium nitride coating, titanium carbonitride coating, titanium aluminum nitride coating, chromium aluminum nitride coating, and diamond coating.

[0070] Titanium nitride (TiN) coating is beneficial for improving the hardness and oxidation temperature of the cutting tool 120. It can also prevent adhesion damage caused by the cutting process, improve the wear resistance and service life of the cutting tool 120, and help to obtain good machining results.

[0071] The carbon added to the titanium carbide (TiCN) coating improves the hardness and surface lubricity of the cutting tip 120, reduces the coefficient of friction of the cutting tip 120, and reduces the internal stress of the titanium carbide (TiCN) coating, which can significantly improve the service life of the cutting tip 120.

[0072] The aluminum oxide layer formed in the titanium aluminum nitride coating (AlTiN coating) can effectively improve the high-temperature machining life of the cutting tool 120. During cutting, a stable oxide layer is formed on the interface between the cutting tool 120 and the chip, which has good heat insulation performance.

[0073] The chromium aluminum nitride coating (AlCrN coating) exhibits good hardness and high-temperature stability under high temperature conditions, and has good hot corrosion resistance, which can effectively improve the machining performance of the 120 tool.

[0074] The diamond coating can specifically be a chemical vapor deposition (CVD) diamond coating, which can effectively improve the service life of the tool tip 120 and improve the reliability and consistency of cutting precision.

[0075] The service life of the welding repair tool 100 can be significantly improved by using a high-temperature resistant coating that includes at least one of titanium nitride coating, titanium carbonitride coating, titanium aluminum nitride coating, chromium aluminum nitride coating and diamond coating.

[0076] In some embodiments, the tool head 120 includes a milling cutter head, a reamer head, or a boring cutter head.

[0077] Of course, the type of cutter head 120 is not limited to milling cutter head, reamer head and boring cutter head. Other types of cutter heads 120 can also be used, as long as the end of the cutter head 120 away from the tool body 110 is provided with a cutting edge 121 that is compatible with the liquid injection hole A.

[0078] By using the milling cutter head, the reamer head or the boring cutter head, the first sealing member 220a can be conveniently removed, the removal efficiency of the first sealing member 220a can be improved, and the rework efficiency of the repair welding operation can be improved.

[0079] The repair welding method of the embodiment of the application uses the repair welding tool 100 of any of the above embodiments to process the battery monomer 200, and the repair welding method comprises:

[0080] S10, using the repair welding tool 100 to cut the connection between the first sealing member 220a and the liquid injection hole A of the battery monomer 200 to remove the first sealing member 220a.

[0081] During the removal of the first sealing member 220a, a cutout that matches the blade edge portion 121 can be formed at the liquid injection hole A of the battery monomer 200, so that the first sealing member 220a (the first sealing member 220a with defects) can be removed, and the cutout can also substantially correspond to the original structure of the liquid injection hole A.

[0082] Optionally, before welding the second sealing member 220b at the liquid injection hole A, the repair welding method further comprises: S20, cleaning the liquid injection hole A.

[0083] The cutting waste generated by removing the first sealing member 220a (the first sealing member 220a with defects) at the liquid injection hole A can be cleaned, so that the second sealing member 220b can be better welded at the liquid injection hole A, that is, welded at the above-mentioned cutout.

[0084] Optionally, the step S20 of cleaning the liquid injection hole A specifically comprises: performing a blowing process towards the liquid injection hole A, and adsorbing and cleaning the liquid injection hole A.

[0085] Specifically, high-quality compressed air can be used to perform a blowing process on the first hole section A1 of the liquid injection hole A, and adsorb and clean the first hole section A1 of the liquid injection hole A.

[0086] On the one hand, the cutout formed at the liquid injection hole A due to cutting can be cooled by using the blowing process; the cutting waste formed at the cutout can be blown to a place by the blowing process, so that the cutting waste blown to the place can be uniformly adsorbed and treated, the damage to the battery monomer 200 caused by the cleaning method of a brush or alcohol can be reduced, the liquid injection hole A can be effectively cleaned, and the battery monomer 200 can also be well protected.

[0087] Optionally, in order to better clean the liquid injection hole A, the step S20 of cleaning the liquid injection hole A further comprises: cleaning the liquid injection hole A by using a laser method.

[0088] The laser cleaning method can remove the trace cutting waste remained in the cutout, improve the cleanliness of the cutout, and further improve the repair welding yield of the second sealing member 220b.

[0089] Optionally, the laser cleaning method for the injection hole A includes: a power of 80W-160W, such as 80W, 120W or 160W; a defocusing amount of -0.5mm-0.5mm, such as -0.5mm, 0mm or 0.5mm; a frequency of 100kHz-200kHz, such as 100kHz, 150kHz or 200kHz; and a cleaning number of greater than or equal to 3, such as 3, 4 or more. For example, the laser cleaning method for the injection hole A includes: a power of 120W; a defocusing amount of 0mm; a frequency of 150kHz; and a cleaning number of 3.

[0090] It should be noted that, since the injection hole A further includes the second hole segment A2 connected to the bottom side of the first hole segment A1, the battery monomer 200 includes a sealing column (not shown in the figure) sealingly connected to the second hole segment A2, so that the cutting waste generated in the process of removing the first sealing member 220a will not enter the battery monomer 200 through the injection hole A, facilitating the cutting operation of removing the first sealing member 220a, the cleaning operation of cleaning the injection hole A, and the repair welding operation of the second sealing member 220b.

[0091] S30, welding the second sealing member 220b at the injection hole A.

[0092] As described above, in the process of performing the repair welding operation on the battery monomer 200 by using the repair welding tool 100, a cutout corresponding to the blade edge 121 can be formed at the injection hole A of the battery monomer 200, and the cutout substantially corresponds to the original structure of the injection hole A. It can be understood that the repair welding operation can be performed by using the second sealing member 220b having the same structure as the first sealing member 220a, and the second sealing member 220b is welded at the cutout. Therefore, the welding process of the first sealing member 220a can be used, and the rework efficiency and yield of the repair welding operation can be improved.

[0093] Optionally, the second sealing member 220b is subjected to a repair welding operation by a laser welding process, and the welding process of the second sealing member 220b is as follows: the power is 6.7KW-7.3KW, for example, 6.7KW, 7KW or 7.3KW; the defocusing amount is 0mm-1mm, for example, 0mm, 0.5mm or 1mm; the welding speed is 6mm / s-8mm / s, for example, 6mm / s, 7mm / s or 8mm / s; and the welding frequency is 16Hz-26Hz, for example, 16Hz, 21Hz or 26Hz. For example, the welding process of the second sealing member 220b is as follows: the power is 7KW; the defocusing amount is 0.5mm; the welding speed is 7mm / s; and the welding frequency is 21Hz.

[0094] An embodiment of the present application provides a repair welding device, please refer to Figure 8 , and refer to Figure 9 , the repair welding tool 100 described in any of the above embodiments, and a welding mechanism 300 for welding the second sealing member 220b at the liquid injection hole A.

[0095] After cutting and removing the first sealing member 220a by the repair welding tool 100, a cutout matching the blade edge portion 121 can be formed at the liquid injection hole A of the battery monomer 200, the welding process of the first sealing member 220a can be used, and the second sealing member 220b can be welded at the cutout by the welding mechanism 300, thereby effectively improving the rework efficiency and yield of the repair welding operation.

[0096] In the embodiment, the repair welding device further comprises a driving mechanism connected to the tool body 110 of the repair welding tool 100, and the driving mechanism is used to drive the repair welding tool 100 to rotate around the central axis of the liquid injection hole A and / or drive the repair welding tool 100 to move along the axial direction of the liquid injection hole A towards the side close to the liquid injection hole A.

[0097] Optionally, the repair welding device further comprises a controller electrically connected to the driving mechanism, and the controller is used to control the output of the driving mechanism to stop the feed movement of the repair welding tool 100 along the axial direction of the liquid injection hole A when the stepped portion and the stepped hole are adapted to abut, so as to intelligently control the feed stroke of the repair welding tool 100 along the axial direction of the liquid injection hole A, improve the cutting precision of the repair welding tool 100, and also facilitate improving the rework efficiency and yield of the repair welding operation.

[0098] Optionally, the drive mechanism includes a first drive mechanism connected to the tool body 110 of the welding tool 100, and a second drive mechanism connected to the first drive mechanism. The first drive mechanism drives the welding tool 100 to rotate around the central axis of the injection hole A, and the second drive mechanism drives the welding tool 100 to move along the axial direction of the injection hole A towards the side closer to the injection hole A. A controller is electrically connected to both the first and second drive mechanisms. The controller stops the output of the second drive mechanism when the stepped portion abuts against the stepped hole. The controller also controls the first drive mechanism to stop operating within a preset time period after the second drive mechanism stops. This ensures that after the second drive mechanism stops operating, the welding tool 100 rotates around the central axis of the injection hole A within the preset time period, effectively removing the first seal 220a.

[0099] Optionally, the preset time period is 2-5 seconds. Of course, the preset time period is not limited to this. The preset time period can also be set according to the structure and number of the cutter head 120, as long as the first seal 220a can be removed.

[0100] It should be noted that, please refer to section 8. Figure 9 The battery cell 200 also includes an electrode assembly and a bottom shell 230 connected to a top cover 210. The top cover 210 and the bottom shell 230 define an encapsulation space for containing the electrolyte and the electrode assembly, which can be encapsulated within the encapsulation space.

[0101] In some embodiments, please refer to Figure 8 The welding repair device also includes an air blowing mechanism 400, which is used to blow air toward the injection hole A when the first seal 220a is removed.

[0102] The air blowing mechanism 400 can be used to cool the cut formed at the injection hole A due to cutting. In addition, the air blowing mechanism 400 can also be used to blow the cutting waste formed at the cut to one place, so that the cutting waste blown to one place can be uniformly absorbed and treated in the future, which can effectively protect the battery cell 200.

[0103] Optionally, the welding repair device also includes a slag suction mechanism, which can be used to uniformly absorb and treat the cutting waste blown to one place.

[0104] In some embodiments, please refer to Figure 10 The welding repair device also includes a laser cleaning mechanism 500, which is used to clean the injection hole A.

[0105] Specifically, the laser cleaning unit 500 is used to clean the first section A1 of the injection hole A.

[0106] The laser cleaning mechanism 500 can be used to remove the trace amount of cutting waste remaining on the machining surface, improve the cleanliness of the cut, and more favorably improve the repair welding yield of the second sealing member 220b.

[0107] The working process of the repair welding device of the present application is as follows:

[0108] First, the second driving mechanism is used to drive the repair welding cutter 100 to move along the axis direction of the liquid injection hole A towards the side close to the liquid injection hole A. When the stepped portion and the stepped hole are adapted to abut, the controller controls the second driving mechanism to stop running, so as to stop the feeding movement of the repair welding cutter 100 along the axis direction of the liquid injection hole A. Then, the controller controls the first driving mechanism to drive the repair welding cutter 100 to rotate around the center axis of the liquid injection hole A within a preset time period, so as to remove the first sealing member 220a. Then, the first hole section A1 of the liquid injection hole A is subjected to air blowing treatment and adsorption cleaning. Then, the first hole section A1 of the liquid injection hole A is cleaned by laser. Finally, the second sealing member 220b is welded on the cut formed at the liquid injection hole A by using the welding mechanism 300. The repair welding process of the second sealing member 220b can use the welding process of the first sealing member 220a, which can effectively improve the rework efficiency and yield of the repair welding operation.

[0109] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, but as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present application.

[0110] The above-described embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A repair tool (100) for a battery cell (200), characterized by, The battery cell (200) includes a top cover (210) and a first seal (220a). The top cover (210) has a through-hole (A), and the first seal (220a) is sealed to the top of the through-hole (A). The welding tool (100) includes: Tool body (110); The cutting head (120) is connected to the cutter body (110), and the end of the cutting head (120) away from the cutter body (110) is provided with a cutting edge (121) that is adapted to the injection hole (A). The cutting edge (121) is used to form a cut corresponding to the cutting edge (121) at the connection between the first seal (220a) and the injection hole (A); The injection port (A) includes a first section (A1) configured as a stepped hole, and the first seal (220a) is sealed to the first section (A1). The cutting edge (121) includes a stepped portion adapted to the first hole section (A1).

2. The welding tool (100) according to claim 1, characterized in that, The main body of the cutting tool (110) has a cylindrical structure.

3. The welding tool (100) according to claim 2, characterized in that, The stepped portion includes a first cutting surface (1211) and a second cutting surface (1212) disposed around the first cutting surface (1211). The first hole segment (A1) has a stepped surface (A11), and the first cutting surface (1211) is used to abut against the stepped surface (A11) of the first hole segment (A1) along the axial direction of the injection hole (A). The second cutting surface (1212) is configured to extend outward at an angle from one end near the first cutting surface (1211) toward the other end.

4. The welding tool (100) according to any one of claims 1-3, characterized in that, The cross-section of the cutter head (120) is constructed as an annular shape along the axis perpendicular to the cutter head (120).

5. The welding tool (100) according to any one of claims 1-3, characterized in that, The welding tool (100) includes at least two cutting heads (120) connected to the outer peripheral wall of the tool body (110), and the at least two cutting heads (120) are arranged at intervals along the circumference of the tool body (110).

6. The welding tool (100) according to any one of claims 1-3, characterized in that, The cutter head (120) is provided with a high-temperature resistant coating.

7. The welding tool (100) according to claim 6, characterized in that, The high-temperature resistant coating includes at least one of titanium nitride coating, titanium carbide nitride coating, titanium aluminum nitride coating, chromium aluminum nitride coating, and diamond coating.

8. The welding tool (100) according to any one of claims 1-3, characterized in that, The cutting head (120) includes a milling cutter head, a reamer head, or a boring cutter head.

9. A repair welding method, characterized in that, The battery cell (200) is processed using the welding tool (100) according to any one of claims 1-8, the welding method comprising: Using the welding repair tool (100), the connection between the first seal (220a) and the liquid injection hole (A) on the battery cell (200) is cut to remove the first seal (220a). The second seal (220b) is welded to the injection hole (A); The first seal (220a) and the second seal (220b) have the same structure.

10. The repair welding method according to claim 9, characterized in that, Before welding the second seal (220b) to the injection hole (A), the welding repair method further includes cleaning the injection hole (A).

11. The repair welding method according to claim 10, characterized in that, The cleaning of the injection hole (A) specifically includes: blowing air towards the injection hole (A) to clean the injection hole (A) by means of air blowing.

12. The repair welding method according to claim 11, characterized in that, The cleaning of the injection hole (A) further includes cleaning the injection hole (A) using a laser.

13. A welding repair device, characterized in that, include: The welding tool (100) as described in any one of claims 1-8; and A welding mechanism (300) is used to weld the second seal (220b) to the injection hole (A).

14. The welding repair device according to claim 13, characterized in that, The welding repair device also includes an air blowing mechanism (400) for blowing air toward the injection hole (A) after the first seal (220a) has been removed.

15. The welding repair device according to claim 13, characterized in that, The welding repair device also includes a laser cleaning mechanism (500), which is used to clean the injection hole (A).

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