Battery welding repair method and battery

Abstract

The present invention provides a battery welding repair method and battery, relating to the field of battery technology. The battery welding repair method comprises: controlling a laser emitter to carve and clean a defective portion to form a welded area; placing a repair component into the welded area; and controlling a laser emitter to weld the repair component into the welded area. Therefore, the battery welding repair method provided by the present invention has a simpler and more convenient operation process, effectively improving welding efficiency, without compromising battery sealing and safety, and at a lower cost.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more specifically, to a battery welding repair method and a battery. Background Technology

[0002] When laser welding is performed on the sealing nails of the battery, the presence of low-melting-point impurities in the weld pool can easily cause intergranular cracking. At the same time, because the internal stress cannot be released during the welding of the sealing nails, cracks appear after the sealing nails are laser welded, which poses a risk of failure and safety hazards to lithium-ion batteries.

[0003] Existing technology involves using a milling cutter to remove the entire defective area of ​​the weld, restoring it to its pre-welding state, and then re-sealing and welding it to effectively repair the weld defect. However, this process is cumbersome. After removing the defective area of ​​the battery sealing pin with a milling cutter, the top cover structure of the lithium battery is easily weakened, increasing the risk of lithium-ion battery failure and thus affecting the safety of the lithium-ion battery. At the same time, milling off the entire sealing pin and then re-welding it is costly and inefficient, resulting in wasted resources. Summary of the Invention

[0004] The objectives of this invention include, for example, providing a battery welding repair method and a battery that can repair only the defective parts of the battery, which is simple to operate, less expensive, and has a higher pass rate and safety.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] In a first aspect, the present invention provides a battery welding repair method, applied to repairing defects caused by welding a sealing nail to a battery, the battery welding repair method comprising:

[0007] The laser emitter is controlled to clean the defective area to form a region to be soldered.

[0008] Place the workpiece to be welded into the area to be welded.

[0009] The laser emitter is controlled to weld the repair component to the area to be welded.

[0010] In an optional embodiment, the step of controlling the laser emitter to scrub the defect to form the area to be soldered includes:

[0011] The laser emitter is controlled to carve grooves into the defect area so that the grooves form a welding area.

[0012] In an optional embodiment, the step of controlling the laser emitter to carve a groove in the defect area so that the groove forms a region to be welded further includes:

[0013] The laser emitter is controlled to carve a groove with a diameter of 3 mm and a depth of 0.2 mm to 0.3 mm into the defect area.

[0014] In an optional embodiment, the step of controlling the laser emitter to scrub the defect to form the area to be soldered includes:

[0015] The laser emitter is controlled to perform 3 to 10 etching cycles on the defective area.

[0016] In an optional embodiment, the step of controlling the laser emitter to scrub the defect to form the area to be soldered further includes:

[0017] The laser emitter is controlled to remove impurities from the defective portion.

[0018] In an optional embodiment, the step of controlling the laser emitter to scrub the defect to form the area to be soldered further includes:

[0019] Wipe the defective area with a cleaning solution.

[0020] In an optional embodiment, the step of controlling the laser emitter to scrub the defect to form the area to be soldered includes:

[0021] The laser emitter is controlled to perform etching and cleaning of the defective area at a power of 50W to 100W, a welding speed of 5000mm / s to 10000mm / s, a defocusing amount of 0.1mm to 1mm, and a frequency of 50Hz to 200Hz.

[0022] In an optional embodiment, the step of controlling the laser emitter to weld the repair component to the area to be welded includes:

[0023] The laser emitter is controlled to weld the repair component to the area to be welded at a power of 5.0Kw to 7.0Kw, a welding speed of 5mm / s to 8mm / s, a defocusing amount of 0.1mm to 1mm, a frequency of 18Hz to 30Hz, and a pulse width of 8ms to 10ms.

[0024] In an optional embodiment, the step of placing the repair component into the area to be welded further includes:

[0025] A welding component made of the same material as the sealing nail is selected as the repair welding component;

[0026] Place the repair component into the area to be welded.

[0027] Secondly, the present invention provides a battery, wherein the battery is manufactured using the battery welding repair method described in any one of the foregoing embodiments according to the aforementioned embodiments.

[0028] The beneficial effects of the battery welding repair method and battery provided in this invention include: controlling a laser emitter to perform laser cleaning on the defective area, so that the laser-cleaned area forms a welding area, which at least covers the area where the defect is located, and also serves as a positioning tool for the component to be welded. After placing the repair component in the welding area, the laser emitter is then controlled to perform laser welding on the repair component, so that the component to be welded is welded to the welding area, thereby removing the defective weld marks of the original defective area, and realizing the repair of defects such as weld marks pits, pinholes, burst points, and cracks in the defective area; effectively solving the problem of battery scrapping caused by defects such as pits, pinholes, burst points, and cracks resulting from laser welding of the battery top cover and sealing nails. In addition, by placing the repair component in the welding area and performing laser welding, compared to removing the sealing nail as a whole, the operation process is simpler and more convenient, which can effectively improve welding efficiency, and not only does it not affect the battery's sealing performance and safety, but the cost is also lower. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 A flowchart of a battery welding repair method provided in an embodiment of the present invention. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0035] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0036] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0037] This invention provides a battery welding repair method for repairing defects caused by welding sealing pins to the top cover of a battery, typically applicable to lithium-ion batteries. The defects arise from low-melting-point impurities in the weld pool during laser welding of the sealing pins to the battery, causing intergranular cracking. Additionally, the inability to release internal stress during welding leads to production line cracks in the sealing pins after laser welding. In other words, the defects include, but are not limited to, pits, pinholes, bursts, cracks, and fissures.

[0038] Please see Figure 1 In this embodiment, the battery welding repair method includes the following steps:

[0039] Step S100: Control the laser emitter to clean the defect area to form the area to be soldered;

[0040] Step S200: Place the workpiece to be welded into the area to be welded;

[0041] Step S300: Control the laser emitter to weld the repair component onto the area to be welded.

[0042] In this embodiment, a laser emitter is controlled to perform laser cleaning on the defective area, so that the laser-cleaned area forms a welding area. The welding area at least covers the area where the defect is located and also serves to position the component to be welded. After the component to be welded is placed in the welding area, the laser emitter is controlled to perform laser welding on the component, so that the component to be welded is welded to the welding area, thereby removing the defective weld marks of the original defective area. This achieves the repair of defects such as weld marks such as pits, pinholes, bursts, and cracks in the defective area; effectively solving the problem of battery scrapping caused by defects such as pits, pinholes, bursts, and cracks resulting from laser welding of the battery top cover and sealing nails.

[0043] In addition, by placing the repair component on the area to be welded and performing laser welding, the operation process is simpler and more convenient than removing the sealing nail as a whole. This can effectively improve welding efficiency and not only does not affect the battery's sealing performance and safety, but is also cheaper.

[0044] It should be noted that the laser emitter used to clean the defective area to form the area to be welded and the laser emitter used to weld the repair part to the area to be welded can be the same laser emitter or two separate laser emitters; no specific limitation is made here.

[0045] Furthermore, before step S100, step S400 is included: wiping the defective area with a cleaning solution.

[0046] In this embodiment, before laser welding the defective part of the battery, the defective part is cleaned with a cleaning solution to remove impurities on the defective part of the battery and avoid the impurities affecting the laser welding.

[0047] Alternatively, the cleaning solution can be alcohol.

[0048] Furthermore, step S100 also includes step S110: controlling the laser emitter to carve a groove in the defect area so that the groove forms a welding area.

[0049] In this embodiment, the defective part is cleaned by a laser emitter to carve grooves into the defective part to form a welding area, which facilitates the positioning of the part to be welded.

[0050] Furthermore, step S110 also includes sub-step S111: controlling the laser emitter to carve a groove with a diameter of 3 mm and a depth of 0.2 mm to 0.3 mm into the defect area.

[0051] In this embodiment, the repair weld is typically circular with a diameter of 1 mm and a thickness of 0.2 mm to 0.3 mm. A groove that roughly matches the shape of the repair weld is etched into the defect area using a laser emitter, so that the repair weld can be placed in the groove.

[0052] Furthermore, step S100 also includes step S120: controlling the laser emitter to perform 3 to 10 etching cycles on the defective area.

[0053] In this embodiment, the laser emitter is controlled to perform 3 to 10 etching cycles on the defective area to ensure the laser cleaning effect and form an effective groove.

[0054] Furthermore, step S100 also includes step S130: controlling the laser emitter to remove impurities from the defective part.

[0055] In this embodiment, the defective area is cleaned by a laser emitter to remove impurities such as metal debris and dust, thus avoiding the influence of impurities on the laser cleaning process.

[0056] Furthermore, step S100 also includes step S140: controlling the laser emitter to perform etching on the defect area with a power of 50W to 100W, a welding speed of 5000mm / s to 10000mm / s, a defocusing amount of 0.1mm to 1mm, and a frequency of 50Hz to 200Hz.

[0057] In this embodiment, the laser emitter is controlled to perform etching on the defect area with a power of 50W to 100W, a welding speed of 5000mm / s to 10000mm / s, a defocusing amount of 0.1mm to 1mm, and a frequency of 50Hz to 200Hz, so as to create a groove.

[0058] Furthermore, step S200 also includes step S210: selecting a welding component of the same material as the sealing nail as a repair welding component; placing the repair welding component into the area to be welded.

[0059] In this embodiment, the area to be welded is a groove. Placing the workpiece into the groove can prevent the workpiece from being blown away from the area to be welded by nitrogen gas during laser welding, thus ensuring that the workpiece is stably fixed in the area to be welded and improving the quality of laser welding.

[0060] Furthermore, step S300 also includes step S310: controlling the laser emitter to weld the repair workpiece onto the area to be welded with a power of 5.0Kw to 7.0Kw, a welding speed of 5mm / s to 8mm / s, a defocusing amount of 0.1mm to 1mm, a frequency of 18Hz to 30Hz, and a pulse width of 8ms to 10ms.

[0061] In this embodiment, the laser emitter is controlled to weld the workpiece with a power of 5.0Kw to 7.0Kw, a welding speed of 5mm / s to 8mm / s, a defocusing amount of 0.1mm to 1mm, a frequency of 18Hz to 30Hz, and a pulse width of 8ms to 10ms, so that the workpiece can be effectively welded to the area to be welded.

[0062] Furthermore, the present invention also provides a battery manufactured using the battery welding repair method described in the above embodiments.

[0063] In summary, this invention provides a battery welding repair method and a battery. A laser emitter is controlled to perform laser cleaning on the defective area, creating a welding area that at least covers the area where the defect is located and also serves as a positioning point for the component to be welded. After placing the repair component in the welding area, the laser emitter is controlled to perform laser welding on the repair component, welding it to the welding area and removing the original defective weld marks. This repairs defects such as weld pits, pinholes, bursts, and cracks, effectively solving the problem of battery failure caused by defects such as pits, pinholes, bursts, and cracks resulting from laser welding of the battery top cover and sealing nails. Furthermore, by placing the repair component in the welding area and performing laser welding, compared to removing the sealing nail entirely, the operation process is simpler and more convenient, effectively improving welding efficiency. It not only does not affect the battery's sealing performance and safety but also reduces costs.

[0064] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A battery welding repair method, applied to repairing defects caused by welding a sealing nail to the battery, characterized in that, The battery welding repair method includes: The laser emitter is controlled to carve grooves into the defective portion, so that the grooves form a welding area, and the welding area at least covers the area where the defective portion is located. The groove has a diameter of 3 mm and a depth of 0.2 mm to 0.3 mm; The weldment is placed into the groove, and the weldment is made of the same material as the sealing nail; The laser emitter is controlled to weld the repair component to the area to be welded. The step of controlling the laser emitter to clean the defect area to form the area to be soldered further includes: The laser emitter is controlled to remove impurities from the defective portion; Prior to the step of controlling the laser emitter to clean the defect to form the area to be soldered, the method further includes: Wipe the defective area with a cleaning solution; The step of controlling the laser emitter to clean the defect area to form the area to be soldered includes: The laser emitter is controlled to perform etching and cleaning of the defective area at a power of 50W~100W, a welding speed of 5000mm / s-10000mm / s, a defocusing amount of 0.1mm~1mm, and a frequency of 50Hz-200Hz. The step of controlling the laser emitter to weld the repair component to the area to be welded includes: The laser emitter is controlled to weld the repair component to the area to be welded at a power of 5.0Kw~7.0Kw, a welding speed of 5mm / s-8mm / s, a defocusing amount of 0.1mm~1mm, a frequency of 18Hz~30Hz, and a pulse width of 8ms~10ms.

2. The battery welding repair method according to claim 1, characterized in that, The step of controlling the laser emitter to clean the defect area to form the area to be soldered includes: The laser emitter is controlled to perform 3 to 10 etching cycles on the defective area.

3. A battery, characterized in that, The battery is manufactured using the battery welding repair method according to any one of claims 1-2.

Images