Repair welding cutter, repair welding method and repair welding device

Abstract

The invention relates to a tool for repair welding, a repair welding method and a repair welding device. A tool for repair welding is used for a single battery. Each single battery comprises a top cover and a first sealing element, a liquid injection hole is formed in the top cover in a penetrating manner, and the first sealing element is connected to the top of the liquid injection hole in a sealing manner. The tool for repair welding comprises a tool body and a tool bit, the tool bit is connected to the tool body, and a cutting edge part matched with the liquid injection hole is arranged at the end, away from the tool body, of the tool bit. The welding process of the first sealing element can be continued, and the rework efficiency and the yield of repair welding operation can be effectively improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a repair welding tool, a repair welding method and a repair welding device. Background Art

[0002] In the related art, the manufacturing process of a battery cell usually includes welding a sealant to the injection hole to seal the injection hole. During the welding process, in some cases, defects such as weld dents may appear on the sealant. Usually, repair welding is used to solve this defect. However, the rework efficiency of the traditional repair welding method is low. Summary of the invention

[0003] Based on this, it is necessary to provide a repair welding tool, a repair welding method and a repair welding device to address the problem of low rework efficiency of traditional repair welding methods.

[0004] According to the first aspect of the present application, a repair welding tool is provided, which is used for a battery cell. The battery cell includes a top cover and a first sealing member, wherein a liquid injection hole is provided through the top cover, and the first sealing member is sealed and connected to the top of the liquid injection hole. The repair welding tool includes a tool body and a tool head, wherein the tool head is connected to the tool body, and an end of the tool head away from the tool body is provided with a cutting edge portion adapted to the liquid injection hole.

[0005] In the technical solution of the present application, since a cutting edge portion matched with the injection hole is provided on the tool head of the repair welding tool, during the process of repair welding operation on the battery cell using the repair welding tool, an incision matched with the cutting edge portion can be formed at the injection hole of the battery cell to remove the defective first seal while making the incision roughly correspond to the original structure of the injection hole, and then the welding process of the first seal can be used to repair weld the second seal with the same structure as the first seal at the incision. In this process, since the cutting edge portion is matched with the injection hole, the volume of the portion cut and removed is smaller, and the welding process of the first seal is used, which can effectively improve the rework efficiency and yield of the repair welding operation.

[0006] In one embodiment, the injection hole includes a first hole section configured as a stepped hole, the first sealing member is sealed and connected to the first hole section, and the cutting edge includes a stepped portion adapted to the first hole section. In the process of performing repair welding on a battery cell using the repair welding tool, the feeding stroke of the repair welding tool along the axial direction of the injection hole can be adjusted according to the stroke required when the repair welding tool is fed to the stepped hole and the stepped portion is adapted to abut against each other, so as to better control the feeding stroke of the repair welding tool along the axial direction of the injection hole, which is beneficial to improving the cutting accuracy of the repair welding tool and also convenient to reduce the volume of the portion to be cut and removed, thereby improving the rework efficiency of the repair welding operation.

[0007] In one embodiment, the step portion includes a first cutting surface and a second cutting surface arranged around the first cutting surface, the first hole segment has a step surface, the first cutting surface is used to abut against the step surface of the first hole segment along the axial direction of the injection hole, and the second cutting surface is configured to extend outwardly and obliquely from one end thereof close to the first cutting surface toward the other end. The second cutting surface of the step portion can cooperate with the incision to form a conical surface, and the original structure of the first injection hole can be retained to the greatest extent. Compared with a traditional tool with the same radial size, the use of the repair welding tool can greatly reduce the volume of the cut and removed portion, thereby improving the rework efficiency of the repair welding operation.

[0008] In one embodiment, the cross section of the cutter head is configured as a circular ring along the direction perpendicular to the axis of the cutter head. When the cutter head with the circular ring structure is used to perform repair welding on the battery cell, the repair welding tool can be driven to rotate around the central axis of the injection hole at a small angle, such as about 10 degrees, so as to remove the first sealing member on the battery cell, which is conducive to further improving the rework efficiency of the repair welding operation.

[0009] In one embodiment, the repair welding tool includes 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 along the circumference 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 embodiment, a high temperature resistant coating is provided on the cutter head. The high temperature resistant coating can reduce the burrs or sticking of the cutter head due to the cutting process in the case of dry processing (without coolant), and can increase the service life of the repair welding tool.

[0011] In one embodiment, the high temperature resistant coating includes at least one of a titanium nitride coating, a titanium carbide nitride coating, a titanium aluminum nitride coating, a chromium aluminum nitride coating, and a diamond coating.

[0012] In one embodiment, the cutter head includes a milling cutter head, a reamer head or a boring cutter head. The milling cutter head, the reamer head or the boring cutter head is used to facilitate 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 the second aspect of the present application, a repair welding method is provided, wherein the battery cell is processed using the repair welding tool described in any of the above embodiments, and the repair welding method comprises: using the repair welding tool to cut the connection between the first seal and the injection hole on the battery cell to remove the first seal; welding the second seal to the injection hole; wherein the first seal and the second seal have the same structure. A second seal with the same structure as the first seal can be used for the repair welding operation, and the second seal is welded to the incision, so that the welding process of the first seal can be used, thereby improving the rework efficiency and yield of the repair welding operation.

[0014] In one embodiment, before welding the second sealing member to the injection hole, the repair welding method further includes: cleaning the injection hole. The cutting waste generated by removing the first sealing member at the injection hole can be cleaned to facilitate subsequent welding of the second sealing member to the injection hole, that is, welding to the above-mentioned incision.

[0015] In one embodiment, cleaning the injection hole specifically includes: using an air blowing method to blow air toward the injection hole, and cleaning the injection hole by adsorption. On the one hand, the air blowing method can be used to cool the incision formed by cutting at the injection hole; the air blowing method can conveniently blow the cutting waste formed at the incision to one place, so as to uniformly adsorb the cutting waste blown to one place, reduce the damage to the battery cell caused by cleaning methods such as brushes or alcohol, and effectively clean the injection hole while also protecting the battery cell well.

[0016] In one embodiment, cleaning the injection hole further includes: cleaning the injection hole by laser. The laser cleaning method can be used to remove a small amount of cutting waste remaining at the incision, improve the cleanliness of the incision, and be more conducive to improving the repair welding yield of the second sealing component.

[0017] According to a third aspect of the present application, a repair welding device is provided, comprising a repair welding tool and a welding mechanism as described in any one of the above embodiments. The welding mechanism is used to weld the second sealing member to the injection hole.

[0018] In one of the embodiments, the repair welding device further includes an air blowing mechanism, which is used to perform air blowing toward the injection hole when the first sealing member is removed.

[0019] In one embodiment, the repair welding device further includes a laser cleaning mechanism, and the laser cleaning mechanism is used to clean the injection hole. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Figure 2 for Figure 1 An enlarged schematic diagram of point B.

[0022] Figure 3 This is a schematic structural diagram of a repair welding tool according to an embodiment of the present application.

[0023] Figure 4 This is a schematic structural diagram of a repair welding tool and a top cover according to an embodiment of the present application.

[0024] Figure 5 The figure is a schematic diagram of the process of repair welding a battery cell using a repair welding tool according to an embodiment of the present application.

[0025] Figure 6 This is a schematic structural diagram of a repair welding tool according to another embodiment of the present application.

[0026] Figure 7 This is a schematic structural diagram of a repair welding tool according to another embodiment of the present application.

[0027] Figure 8 This is a schematic structural diagram of a repair welding tool, an air blowing mechanism and a battery cell according to an embodiment of the present application.

[0028] Fig. 9 Schematic diagram of the process of repair welding a battery cell by a welding mechanism according to an embodiment of the present application.

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

[0030] Reference numerals: 100, repair welding tool; 110, tool body; 120, tool head; 121, cutting edge; 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-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0033] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0034] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0036] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0038] As described in the background art, repair welding is usually used to solve defects such as weld depressions on sealing components.

[0039] In the traditional repair welding method, in the process of removing the defective seal, a part of the side wall of the injection hole is usually also cut off, resulting in a large amount of metal removal, which in turn causes the rework efficiency of the traditional repair welding method to be low; at the same time, it will also cause the radial size of the injection hole to increase, which will result in the need to customize a larger seal to weld the larger seal to the injection hole, which will increase the cost of the customized seal, and the repair welding process of the larger seal will still use the original welding process of the seal, which makes the repair welding of the larger seal prone to poor welding.

[0040] In order to solve at least one of the above-mentioned technical problems, the present application designs a repair welding tool, a repair welding method and a repair welding device, which can use the repair welding tool to remove defective seals while also helping to maintain the original structure of the injection hole, making it convenient to use seals of the same size for repair welding, thereby improving the repair welding efficiency and ensuring the consistency of the welding process, thereby improving the repair welding yield.

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

[0042] Figure 1 FIG. 2 shows a partial structural diagram of a battery cell 200 according to an embodiment of the present application. Figure 2 for Figure 1 An enlarged schematic diagram of point B.

[0043] A repair welding tool 100 provided in an embodiment of the present application is used for a battery cell 200 .

[0044] See also Figure 1 and 2 The battery cell 200 includes a top cover 210 and a first sealing member 220 a . A liquid injection hole A is formed through the top cover 210 . The first sealing member 220 a is sealed and connected to the top of the liquid injection hole A.

[0045] The first sealing member 220 a is substantially in the shape of a cap, and the first sealing member 220 a can be used to seal the injection hole A, thereby improving the sealing reliability of the battery cell 200 .

[0046] See also Figure 3 , and refer to Figure 4 and Figure 5 The repair welding tool 100 includes a tool body 110 and a tool head 120 . The tool head 120 is connected to the tool body 110 , and a cutting edge portion 121 matching the injection hole A is provided at one end of the tool head 120 away from the tool body 110 .

[0047] When the repair welding tool 100 is in use, the repair welding tool 100 is usually driven by a driving mechanism to rotate around the central axis of the injection hole A, and the repair welding tool 100 is driven to move along the axial direction of the injection hole A toward the side close to the injection hole A, so that the repair welding tool 100 can be used to cut the injection hole A.

[0048] The tool body 110 refers to the part of the repair welding tool 100 used to connect with the driving mechanism. The tool body 110 may be a cylindrical structure, which is convenient for connecting 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 injection hole A, and to drive the repair welding tool 100 to move along the axis direction of the injection hole A toward the side close to the injection hole A. Optionally, the tool body 110 is a cylindrical structure.

[0049] The cutter head 120 refers to a portion of the repair welding cutter 100 for cutting the connection between the first sealing member 220 a and the injection hole A.

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

[0051] Since the blade head 120 of the repair welding tool 100 is provided with a cutting edge 121 adapted to the liquid injection hole A, when the repair welding tool 100 is used to perform repair welding on the battery cell 200, a cut adapted to the cutting edge 121 can be formed at the liquid injection hole A of the battery cell 200, so as to remove the defective first sealing member 220a and make the cut roughly correspond to the original structure of the liquid injection hole A, so that the second sealing member 220a having the same structure as the first sealing member 220a can be welded by using the welding process of the first sealing member 220a. The seal 220b is repaired by welding at the incision. In this process, since the cutting edge 121 is compatible with the injection hole A, the volume of the cut and removed part is smaller, and the welding process of the first seal 220a is used, which can effectively improve the rework efficiency and yield of the repair welding operation. In addition, the repair welding tool 100 of the present application is used to perform the repair welding operation of the second seal 220b. Since the second seal 220b has the same structure as the first seal 220a, the customization cost of a larger sealing pin can be saved, and the cost of the repair welding operation can be reduced to a certain extent.

[0052] It should be added that the second seal 220b has the same structure as the first seal 220a, and the second seal 220b and the first seal 220a may be manufactured using the same manufacturing process, for example, the second seal 220b and the first seal 220a may be seals from the same batch.

[0053] In some embodiments, the injection hole A includes a first hole segment A1 configured as a stepped hole, the first sealing member 220a is sealingly connected to the first hole segment A1, and the cutting edge portion 121 includes a stepped portion adapted to the first hole segment A1.

[0054] Since the first hole segment A1 of the injection hole A is constructed as a stepped hole, and the cutting edge portion 121 includes a stepped portion adapted to the first hole segment A1, when the repair welding tool 100 is used to perform repair welding on the battery cell 200, the feeding stroke of the repair welding tool 100 along the axial direction of the 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 step portion is adapted to abut, so as to better control the feeding stroke of the repair welding tool 100 along the axial direction of the injection hole A, which is conducive to improving the cutting accuracy of the repair welding tool 100 and also convenient for reducing the volume of the cut and removed part, thereby improving the rework efficiency of the repair welding operation. In this embodiment, the injection hole A also includes a second hole segment A2 connected to the bottom end of the first hole segment A1, and the battery cell 200 includes a sealing column (not shown in the figure), which is sealed and connected to the second hole segment A2.

[0055] The sealing column seals the second hole segment A2 of the injection hole A, and the first sealing member 220a seals the first hole segment A1 of the injection hole A, thereby realizing double sealing of the injection hole A. At the same time, during 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 cell 200 through the injection hole A, thereby facilitating the repair welding operation.

[0056] In some embodiments, the step portion includes a first cutting surface 1211 and a second cutting surface 1212 arranged around the first cutting surface 1211, the first hole segment A1 has a step surface A11, the first cutting surface 1211 is used to abut against the step surface A11 of the first hole segment A1 along the axial direction of the injection hole A, and the second cutting surface 1212 is constructed to extend outwardly at an angle from one end close to the first cutting surface 1211 toward the other end.

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

[0058] The second cutting surface 1212 is constructed to extend outwardly obliquely from one end close to the first cutting surface 1211 toward the other end, and is combined with the cutting edge portion 121 to include a step portion adapted to the first hole segment A1. In this way, the cutting edge portion 121 can be well utilized to form an incision adapted to the cutting edge portion 121 at the first injection hole A1 of the battery cell 200 to remove the defective first seal 220a while making the incision roughly correspond to the original structure of the first injection hole A1, and the second cutting surface 1212 of the step portion can form a conical surface with the incision, which can retain the original structure of the first injection hole A1 to the greatest extent. Compared with traditional tools with consistent radial dimensions, the use of the repair welding tool 100 can greatly reduce the volume of the cut and removed portion, thereby improving the rework efficiency of the repair welding operation.

[0059] In some embodiments, see Figure 3-Figure 5 In the direction perpendicular to the axis of the cutter head 120 , the cross section of the cutter head 120 is configured as a circular ring.

[0060] During the repair welding operation on the battery cell 200 using the ring-shaped cutter head 120, the repair welding tool 100 can be driven to rotate around the central axis of the injection hole A at a small angle, such as about 10 degrees, so as to remove the first seal 220a (the defective first seal 220a) on the battery cell 200, which is beneficial to further improve the rework efficiency of the repair welding operation.

[0061] In other embodiments, see 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 repair welding tool 100 including two tool heads 120 evenly spaced along the circumference of the tool body 110 as an example, when using the repair welding tool 100 to repair the battery cell 200, the repair welding tool 100 can be driven to rotate 180 degrees around the central axis of the injection hole A, so as to remove the first seal 220a (the defective first seal 220a) on the battery cell 200, which is beneficial to further improve the rework efficiency of the repair welding operation.

[0063] It can be understood that at least two cutter heads 120 can improve the removal efficiency of the first seal 220a (the first seal 220a with defects), thereby improving the rework efficiency of the repair welding operation.

[0064] Of course, the present application is not limited thereto, and during the process of performing repair welding on the battery cell 200 using the repair welding tool 100, the repair welding tool 100 may be driven to rotate 360 ​​degrees around the central axis of the injection hole A to remove the first sealing member 220a (the first sealing member 220a with defects). Figure 7 In the illustrated embodiment, the repair welding tool 100 needs to be rotated 360 degrees around the central axis of the injection hole A to remove the first sealing member 220 a (the first sealing member 220 a having a defect).

[0065] In some embodiments, a high temperature resistant coating is provided on the cutter head 120 .

[0066] High temperature resistant coating refers to a coating that can maintain good structure and strength at temperatures of 1000℃-1200℃.

[0067] The tool head 120 is provided with a high temperature resistant coating, which can reduce burrs or tool sticking on the tool head 120 due to the cutting process during dry processing (without coolant), thereby increasing 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 carbide nitride 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 titanium nitride coating, titanium nitride carbide coating, titanium aluminum nitride coating, chromium aluminum nitride coating and diamond coating; it may include two of titanium nitride coating, titanium nitride carbide coating, titanium aluminum nitride coating, chromium aluminum nitride coating and diamond coating; it may include three of titanium nitride coating, titanium nitride carbide coating, titanium aluminum nitride coating, chromium aluminum nitride coating and diamond coating; it may include four of titanium nitride coating, titanium nitride carbide coating, titanium aluminum nitride coating, chromium aluminum nitride coating and diamond coating; it may include titanium nitride coating, titanium nitride carbide coating, titanium aluminum nitride coating, chromium aluminum nitride coating and diamond coating.

[0070] The titanium nitride coating (TiN coating) is beneficial to improving the hardness and oxidation temperature of the cutter head 120, and can prevent adhesion damage and the like on the cutter head 120 caused by the cutting process, thereby improving the wear resistance and service life of the cutter head 120, and is also beneficial to obtaining good processing results.

[0071] The carbon added to the titanium carbide nitride coating (TiCN coating) can improve the hardness and surface lubricity of the cutter head 120 , reduce the friction coefficient of the cutter head 120 , and simultaneously reduce the internal stress of the titanium carbide nitride (TiCN) coating, which can significantly increase the service life of the cutter head 120 .

[0072] The aluminum oxide layer formed in the titanium aluminum nitride coating (AlTiN coating) can effectively improve the high-temperature processing life of the cutter head 120. During cutting, a stable oxide layer is formed on the interface between the cutter head 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, has good thermal corrosion resistance, and can effectively improve the processing performance of the tool head 120.

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

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

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

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

[0078] The first sealing member 220a can be easily removed by using a milling cutter head, a reamer head or a boring cutter head, thereby improving the removal efficiency of the first sealing member 220a and further improving the rework efficiency of the repair welding operation.

[0079] A repair welding method according to an embodiment of the present application uses the repair welding tool 100 described in any of the above embodiments to process a battery cell 200. The repair welding method includes:

[0080] S10 , using the repair welding cutter 100 , cutting the connection between the first sealing member 220 a and the injection hole A on the battery cell 200 to remove the first sealing member 220 a .

[0081] During the process of removing the first sealant 220a, an incision matching the cutting edge 121 can be formed at the injection hole A of the battery cell 200 to remove the first sealant 220a (the defective first sealant 220a) while making the incision roughly correspond to the original structure of the injection hole A.

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

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

[0084] Optionally, the step S20 of cleaning the injection hole A specifically includes: performing air blowing treatment toward the injection hole A by blowing, and cleaning the injection hole A by adsorption.

[0085] Specifically, high-quality compressed air may be used to blow air to the first injection hole A1 of the injection hole A, and the first injection hole A1 of the injection hole A may be cleaned by adsorption.

[0086] On the one hand, the air blowing treatment can be used to cool the incision formed by cutting at the injection hole A; the air blowing treatment is convenient for blowing the cutting waste formed at the incision to one place, so as to uniformly adsorb the cutting waste blown to one place, thereby reducing the damage to the battery cell 200 caused by cleaning methods such as brushes or alcohol, and effectively cleaning the injection hole A while also protecting the battery cell 200 well.

[0087] Optionally, in order to better clean the injection hole A, the step S20 of cleaning the injection hole A further includes: cleaning the injection hole A by laser.

[0088] Laser cleaning can be used to remove trace amounts of cutting waste remaining at the incision, thereby improving the cleanliness of the incision and further facilitating improving the repair welding yield of the second sealing member 220 b.

[0089] Optionally, the process of cleaning the injection hole A by laser includes: power of 80W-160W, such as 80W, 120W or 160W; defocus of -0.5mm-0.5mm, such as -0.5mm, 0mm or 0.5mm; frequency of 100kHz-200kHz, such as 100kHz, 150kHz or 200kHz; cleaning times greater than or equal to 3 times, such as 3 times, 4 times or more. For example, the process of cleaning the injection hole A by laser includes: power of 120W; defocus of 0mm; frequency of 150kHz; cleaning times 3 times.

[0090] It should be noted that, since the injection hole A also includes a second hole segment A2 connected to the bottom side of the first hole segment A1, the battery cell 200 includes a sealing column (not shown in the figure) sealed and connected to the second hole segment A2. In this way, the cutting waste generated during the removal of the first seal 220a will not enter the battery cell 200 through the injection hole A, which facilitates the cutting operation of removing the first seal 220a, the cleaning operation of cleaning the injection hole A, and the repair welding operation of the second seal 220b.

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

[0092] As described above, in the process of repair welding the battery cell 200 using the repair welding tool 100, an incision that is compatible with the cutting edge 121 can be formed at the injection hole A of the battery cell 200, and the incision roughly corresponds to the original structure of the injection hole A. It can be understood that a second sealing member 220b with the same structure as the first sealing member 220a can be used for the repair welding operation, and the second sealing member 220b can be welded to the incision. In this way, the welding process of the first sealing member 220a can be used, thereby improving the rework efficiency and yield of the repair welding operation.

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

[0094] An embodiment of the present application provides a repair welding device, see Figure 8 , and refer to Fig. 9 , including the repair welding tool 100 described in any of the above embodiments, and a welding mechanism 300, the welding mechanism 300 is used to weld the second sealing member 220b to the injection hole A.

[0095] After using the repair welding tool 100 to cut and remove the first sealing member 220a, an incision that matches the cutting edge 121 can be formed at the injection hole A of the battery cell 200. The welding process of the first sealing member 220a can be used, and the second sealing member 220b can be welded to the incision with the help of the welding mechanism 300, which can effectively improve the rework efficiency and yield of the repair welding operation.

[0096] In this embodiment, the repair welding device also includes 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 injection hole A and / or drive the repair welding tool 100 to move along the axial direction of the injection hole A toward the side close to the injection hole A.

[0097] Optionally, the repair welding device also includes a controller electrically connected to the drive mechanism, and the controller is used to control the output of the drive mechanism when the step portion is adapted to abut against the step hole to stop the feeding movement of the repair welding tool 100 along the axial direction of the injection hole A. The feeding stroke of the repair welding tool 100 along the axial direction of the injection hole A can be intelligently controlled to improve the cutting accuracy of the repair welding tool 100, which is also beneficial to improving the rework efficiency and yield of the repair welding operation.

[0098] Optionally, the driving mechanism includes a first driving mechanism connected to the tool body 110 of the repair welding tool 100, and a second driving mechanism connected to the first driving mechanism, the first driving mechanism is used to drive the repair welding tool 100 to rotate around the central axis of the injection hole A, and the second driving mechanism is used to drive the repair welding tool 100 to move along the axis direction of the injection hole A toward the side close to the injection hole A. The controller is electrically connected to the first driving mechanism and the second driving mechanism respectively, and the controller is used to stop the output of the second driving mechanism when the step portion and the step hole are adapted to abut. The controller is used to control the first driving mechanism to stop operating within a preset time period after the second driving mechanism stops operating. It is convenient to rotate the repair welding tool 100 around the central axis of the injection hole A within a preset time period after the second driving mechanism stops operating, so as to well remove the first sealing member 220a.

[0099] Optionally, the preset time period is 2-5s. Of course, the preset time period is not limited thereto, and the preset time period may 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 is necessary to add that please refer to 8 and Fig. 9 The battery cell 200 further includes an electrode assembly and a bottom shell 230 connected to the top cover 210 . The top cover 210 and the bottom shell 230 define a packaging space for accommodating an electrolyte and the electrode assembly. The electrode assembly can be packaged in the packaging space.

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

[0102] The blowing mechanism 400 can be used to cool the incision formed at the injection hole A due to cutting. In addition, the blowing mechanism 400 can also be used to blow the cutting waste formed at the incision to one place, so that the cutting waste blown to one place can be uniformly adsorbed and processed later, which can well protect the battery cell 200.

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

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

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

[0106] The laser cleaning mechanism 500 can be used to remove trace amounts of cutting waste remaining on the processing surface, thereby improving the cleanliness of the incision, and further facilitating improving the repair welding yield of the second sealing member 220 b.

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

[0108] First, the second driving mechanism is used to drive the repair welding tool 100 to move along the axial direction of the injection hole A toward the side close to the injection hole A. When the step portion is adapted to abut against the step hole, the controller controls the second driving mechanism to stop running to stop the feeding movement of the repair welding tool 100 along the axial direction of the injection hole A. After that, the controller controls the first driving mechanism to drive the repair welding tool 100 to rotate around the central axis of the injection hole A within a preset time period to remove the first sealing member 220a; then, the first injection hole A1 of the injection hole A is blown, and the first injection hole A1 of the injection hole A is cleaned by adsorption; then, the first injection hole A1 of the injection hole A is cleaned by laser; finally, the second sealing member 220b is welded to the incision formed at the injection hole A by the welding mechanism 300. The repair welding process of the second sealing member 220b can follow the welding process of the first sealing member 220a, which can effectively improve the rework efficiency and yield rate of the repair welding operation.

[0109] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0110] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A repair welding tool (100), used for a battery cell (200), characterized in that: The battery cell (200) comprises a top cover (210) and a first sealing member (220a), wherein a liquid injection hole (A) is provided through the top cover (210), and the first sealing member (220a) is sealed and connected to the top of the liquid injection hole (A); the repair welding tool (100) comprises: A tool body (110); The cutter head (120) is connected to the cutter body (110), and an end of the cutter head (120) away from the cutter body (110) is provided with a cutting edge portion (121) adapted to the liquid injection hole (A).

2. The repair welding tool (100) according to claim 1, characterized in that: The injection hole (A) comprises 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 cutting edge portion (121) comprises a step portion adapted to the first hole section (A1).

3. The repair welding tool (100) according to claim 2, characterized in that: The step portion comprises a first cutting surface (1211) and a second cutting surface (1212) arranged around the first cutting surface (1211); The first hole section (A1) has a step surface (A11), and the first cutting surface (1211) is used to abut against the step surface (A11) of the first hole section (A1) along the axial direction of the injection hole (A); The second cutting surface (1212) is configured to extend outwardly and obliquely from one end thereof close to the first cutting surface (1211) toward the other end.

4. The repair welding tool (100) according to any one of claims 1 to 3, characterized in that: In a direction perpendicular to the axis of the cutter head (120), a cross section of the cutter head (120) is configured in a circular ring shape.

5. The repair welding tool (100) according to any one of claims 1 to 3, characterized in that: The repair welding tool (100) comprises 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).

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

7. The repair welding tool (100) according to claim 6, characterized in that: 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.

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

9. A repair welding method, characterized in that: A battery cell (200) is processed using the repair welding tool (100) according to any one of claims 1 to 8, wherein the repair welding method comprises: Using the repair welding cutter (100), cutting the connection between the first sealing member (220a) and the injection hole (A) on the battery cell (200) to remove the first sealing member (220a); Welding a second sealing member (220b) to the liquid injection hole (A); Wherein, the first sealing member (220a) and the second sealing member (220b) have the same structure.

10. The repair welding method according to claim 9, characterized in that: Before welding the second sealing member (220b) to the liquid injection hole (A), the repair welding method further comprises: cleaning the liquid 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 toward the injection hole (A) by blowing, and cleaning the injection hole (A) by adsorption.

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

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

14. The repair welding device according to claim 13, characterized in that: The repair welding device further comprises an air blowing mechanism (400), and the air blowing mechanism (400) is used to perform air blowing treatment towards the injection hole (A) when the first sealing member (220a) is removed.

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

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