Battery welding device and battery production system

Abstract

The embodiment of the application provides a battery welding device and a battery production system, and relates to the technical field of batteries. The battery welding device comprises a welding mechanism and a welding pressure nozzle. The welding mechanism is used for welding a to-be-welded part. The welding pressure nozzle is provided with a welding cavity penetrating through the welding pressure nozzle. The welding cavity has a first opening and a second opening facing opposite directions. The first opening is arranged to face the welding mechanism. The second opening is used for facing the to-be-welded part. A release function layer is arranged on the inner wall surface of the welding cavity. The surface energy of the release function layer is smaller than that of the inner wall surface. The roughness of the release function layer is smaller than that of the inner wall surface. When the welding slag is not solidified and is in a molten state and splashes on the release function layer during welding, the release function layer can reduce the possibility of the welding slag directly embedding on the inner wall surface of the welding cavity. The welding slag can roll in a spherical shape on the smooth release function layer, thereby facilitating the removal of the subsequent welding slag.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery welding apparatus and a battery production system. Background Technology

[0002] In the production process of battery devices, welding processes are required, such as welding adapter pieces using laser welding equipment.

[0003] Welding slag generated during the welding process is prone to deposition, affecting the quality of subsequent welding. Therefore, how to more effectively remove the welding slag generated during the welding process is a research direction in battery technology. Utility Model Content

[0004] This application provides a battery welding apparatus that can more effectively remove welding slag generated during the welding process.

[0005] In a first aspect, embodiments of this application provide a battery welding apparatus, including a welding mechanism and a welding nozzle. The welding mechanism is used to weld a workpiece to be welded. The welding nozzle has a welding cavity extending through itself. The welding cavity has a first opening and a second opening facing opposite directions. The first opening faces the welding mechanism, and the second opening faces the workpiece to be welded. An anti-sticking functional layer is provided on the inner wall surface of the welding cavity. The surface energy of the anti-sticking functional layer is less than the surface energy of the inner wall surface, and the roughness of the anti-sticking functional layer is less than the roughness of the inner wall surface.

[0006] By adopting the above technical solution, an anti-sticking functional layer is set on the inner wall surface of the welding cavity. Since the surface energy and Ra value of the anti-sticking functional layer are smaller than those of the inner wall surface, when uncured and molten slag sputters onto the anti-sticking functional layer during welding, the smooth anti-sticking functional layer can reduce the possibility of the slag directly embedding into the inner wall of the welding cavity. The slag can roll off the smooth anti-sticking functional layer in a spherical shape, which is conducive to the subsequent removal of slag.

[0007] In some embodiments of this application, the surface roughness Ra value of the anti-stick functional layer is less than or equal to 0.5 μm, and / or the surface energy of the anti-stick functional layer is less than or equal to 30 mN / m.

[0008] By adopting the above technical solution, designing the surface roughness Ra value of the anti-adhesion functional layer to be less than or equal to 0.5μm and the surface energy of the anti-adhesion functional layer to be less than or equal to 30mN / m, the smoothness of the anti-adhesion functional layer can be improved, and the possibility of welding slag adhering to the cavity can be reduced.

[0009] In some embodiments of this application, the anti-stick functional layer includes a first coating layer, at least a portion of which is a ceramic layer.

[0010] By adopting the above technical solution, the first coating layer is designed to be at least partly a ceramic layer. Ceramic materials have the advantages of high temperature resistance, stable chemical properties and low cost, and can effectively reduce the possibility of weld slag adhering to the welding cavity.

[0011] In some embodiments of this application, the maximum thickness of the first coating layer is less than or equal to 0.5 mm.

[0012] By adopting the above technical solution, the maximum thickness of the first coating layer is designed to be less than or equal to 0.5 mm, which not only facilitates the removal of welding slag but also saves costs as much as possible and reduces the processing difficulty of the welding nozzle.

[0013] In some embodiments of this application, the anti-stick functional layer further includes a second coating layer disposed on the first coating layer, the second coating layer being used to fill the pores on the surface of the first coating layer facing away from the inner wall surface.

[0014] By using the above technical solution, the second coating layer fills the pores on the surface of the first coating layer that is away from the inner wall, which can reduce the roughness and surface energy of the anti-sticking functional layer, making it easier for the welding slag to slide out of the welding cavity, thereby further reducing the possibility of welding slag sticking to the welding cavity.

[0015] In some embodiments of this application, the Ra value of the roughness of the second coating layer is less than the Ra value of the roughness of the first coating layer.

[0016] By adopting the above technical solution, the Ra value of the roughness of the second coating layer is less than the Ra value of the roughness of the first coating layer, thereby further reducing the roughness of the anti-stick functional layer.

[0017] In some embodiments of this application, the second coating layer is a glaze layer.

[0018] By adopting the above technical solution, the glassy dense layer formed after the glaze melts can better fill the pores and gaps on the surface of the ceramic layer, reduce the physical anchor points for weld slag adhesion, and thus significantly reduce the possibility of weld slag adhesion; moreover, the glaze layer is relatively smooth, making it difficult for the molten weld slag to automatically peel off by its own shrinkage stress after cooling, thus achieving a better anti-sticking effect and more convenient subsequent cleaning.

[0019] In some embodiments of this application, the maximum thickness of the glaze layer is less than the maximum thickness of the first coating layer.

[0020] Using the above technical solution, the maximum thickness of the glaze layer is less than the maximum thickness of the first coating layer. While satisfying the requirements of filling the gaps in the ceramic layer and improving the smoothness of the anti-stick functional layer, it will not over-cover and change the structural strength and heat resistance of the ceramic layer. This allows the anti-stick functional layer to have both anti-stick, high temperature resistance, and wear resistance properties.

[0021] In some embodiments of this application, the inner wall surface is an uneven surface with multiple recesses and / or protrusions, and the anti-stick functional layer engages with the recesses and / or protrusions.

[0022] By adopting the above technical solution, the inner wall surface is designed to be uneven, and the uneven surface forms multiple anchoring points that engage with the anti-adhesive functional layer, thereby improving the connection stability between the anti-adhesive functional layer and the inner wall surface and reducing the possibility of the anti-adhesive functional layer detaching from the inner wall surface.

[0023] In some embodiments of this application, the roughness Ra value of the inner wall surface is greater than or equal to 3.2 μm.

[0024] By adopting the above technical solution, the Ra value of the inner wall surface is designed to be greater than or equal to 3.2μm, thereby improving the roughness of the inner wall surface and further enhancing the connection stability between the anti-stick functional layer and the inner wall surface.

[0025] In some embodiments of this application, the battery welding apparatus further includes a blower mechanism. The welding nozzle has an air inlet and an air outlet respectively connected to the welding cavity on its surface facing the welding mechanism. The air inlet is located on one side of the first opening along a first direction, and the air outlet is located on the other side of the first opening along the first direction. The first direction intersects the arrangement direction from the first opening to the second opening. The blower mechanism is configured to blow airflow through the air inlet into the welding cavity to remove welding slag, and the air outlet is used to discharge welding slag and the airflow of the blower mechanism.

[0026] By adopting the above technical solution, the airflow of the blower mechanism can carry the welding slag away from the welding chamber, thereby improving the efficiency and effectiveness of welding slag removal.

[0027] In some embodiments of this application, the battery welding device further includes an adsorption mechanism connected to the air outlet and used for negative pressure adsorption of welding slag.

[0028] By adopting the above technical solution, the negative pressure adsorption of welding slag by the adsorption mechanism, combined with the blowing mechanism, can further improve the efficiency and effect of welding slag removal and reduce the possibility of welding slag remaining in the welding cavity.

[0029] In some embodiments of this application, the battery welding device further includes a cover plate located between the welding mechanism and the welding nozzle. The welding nozzle is installed on the side of the cover plate away from the welding mechanism. The cover plate has a first through hole communicating with the first opening and a second through hole communicating with the air inlet. The air outlet includes a groove on the surface of the welding nozzle facing the cover plate. The groove has an opening at each end along the first direction. One opening of the groove is used to connect to the welding chamber, and the other opening is used to discharge welding slag. The surface of the cover plate away from the welding mechanism and the groove form a slag discharge channel.

[0030] By adopting the above technical solution, the cover plate not only facilitates the installation of the welding nozzle, but also the groove of the cover plate and the welding nozzle encloses the slag discharge channel. The structure is ingenious and multifunctional. Moreover, compared with the method of directly opening holes in the welding nozzle, it is easier to process the groove on the surface of the welding nozzle.

[0031] In some embodiments of this application, the number of welding nozzles is multiple, and the multiple welding nozzles are arranged at intervals along the first direction and / or the second direction on the cover plate, the second direction intersecting the arrangement direction from the first opening to the second opening and intersecting the first direction.

[0032] By adopting the above technical solution, multiple welding nozzles can be installed using the cover plate, thereby enabling simultaneous welding of multiple parts to be welded and improving welding efficiency.

[0033] Secondly, embodiments of this application provide a battery production system, including a battery welding apparatus as described in any of the above technical solutions. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the structure of a battery welding apparatus provided in some embodiments of this application;

[0036] Figure 2 This is a schematic diagram of the structure of the welding nozzle provided in some embodiments of this application;

[0037] Figure 3 for Figure 2 AA section diagram;

[0038] Figure 4for Figure 3 Enlarged view of part b;

[0039] Figure 5 This is a schematic diagram showing the connection between the anti-stick functional layer and the inner wall surface provided in an embodiment of this application.

[0040] The reference numerals in the accompanying drawings for the specific embodiments are as follows:

[0041] 100. Battery welding equipment;

[0042] 10. Welding mechanism; 11. Laser; 12. Support frame;

[0043] 20. Welding nozzle; 21. Welding cavity; 211. First opening; 212. Second opening; 213. Inner wall surface; 2131. Recess; 2132. Protrusion; 214. Anti-stick functional layer; 2141. First coating layer; 2142. Second coating layer; 22. Air inlet; 23. Air outlet; 231. Groove;

[0044] 30. Hair dryer mechanism;

[0045] 40. Adsorption mechanism;

[0046] 50. Cover plate; 51. First through hole; 52. Second through hole;

[0047] 200. Parts to be welded;

[0048] X, the first direction; Y, the second direction. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0050] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "including," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0051] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0052] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0053] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0054] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0055] In this application, "multiple" means two or more (including two).

[0056] The embodiments of this application will now be described in detail.

[0057] Currently, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace, among other fields. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.

[0058] In the battery production process, welding operations are required using welding equipment, such as welding adapters and tabs using laser welding equipment. The laser welding equipment has a welding nozzle for pressing the adapters and other parts to be welded. The welding nozzle has a welding chamber for the laser to pass through. During welding, the laser passes through the welding chamber to reach the adapter for welding.

[0059] The welding nozzles used in related technologies are generally made of metals such as stainless steel. Their surfaces are rough and have high surface energy. During welding, the weld slag (molten droplets) produced tends to adhere to and embed into the micropores of the inner wall of the welding chamber, forming a metallurgical bond. This results in weld slag deposits in the welding chamber that are difficult to remove, which not only damages the welding nozzle but also easily affects the subsequent welding quality.

[0060] Therefore, how to reduce the deposition of welding slag in the welding chamber to facilitate the subsequent removal of welding slag is an important issue in battery production and processing.

[0061] In view of this, this application provides a technical solution that solves the above-mentioned technical problems by providing an anti-sticking functional layer on the inner wall surface of the welding chamber, using an anti-sticking functional layer that is smoother and less conducive to slag deposition.

[0062] The following is in conjunction with the appendix Figure 1-5 The battery welding apparatus 100 provided in the embodiments of this application will be described.

[0063] Combined with appendix Figure 1-4 As shown, this application embodiment provides a battery welding device 100, including a welding mechanism 10 and a welding nozzle 20. The welding mechanism 10 is used to weld a workpiece 200 to be welded. The welding nozzle 20 is provided with a welding cavity 21 that extends through itself. The welding cavity 21 has a first opening 211 and a second opening 212 facing opposite directions. The first opening 211 is disposed facing the welding mechanism 10, and the second opening 212 is disposed facing the workpiece 200 to be welded. An anti-sticking functional layer 214 is disposed on the inner wall surface 213 of the welding cavity 21. The surface energy of the anti-sticking functional layer 214 is less than the surface energy of the inner wall surface 213, and the roughness of the anti-sticking functional layer 214 is less than the roughness of the inner wall surface 213.

[0064] The welding mechanism 10 can be a laser welding mechanism 10, and the workpiece 200 to be welded can be an adapter plate. In some embodiments, the welding mechanism 10 may include a laser 11 and a bracket 12 for mounting the laser 11. The laser 11 may be a fiber laser 11 or a semiconductor laser 11, etc. The laser 11 is a device that uses a high-energy-density laser beam as a heat source to melt the materials of the adapter plate and the battery tab (or other workpiece 200 to be welded) to achieve connection.

[0065] Of course, in addition to the laser welding mechanism 10 mentioned above, the welding mechanism 10 can also be ultrasonic welding or traditional electric arc welding, etc., which will not be listed one by one in this embodiment.

[0066] The welding nozzle 20 has several functions. One function is to apply pressure to the adapter plate during welding, so that the adapter plate can fit with the electrode and other structures to eliminate assembly gaps. Another function is to form a physical barrier to prevent welding slag from splashing. Yet another function is to enable the laser to perform welding operations according to a preset path, thereby improving the stability of laser welding.

[0067] Taking laser welding adapter as an example, during welding, the workpiece 200 generates molten droplets that easily embed into the inner wall surface 213 of the welding nozzle 20. After the droplets solidify, they form weld slag deposits that are difficult to remove.

[0068] The reason for this phenomenon is that the existing welding nozzles 20 are generally made of metal materials such as stainless steel. Stainless steel has a rough surface (roughness Ra value greater than 1.6μm) and a large surface energy (surface energy greater than 72mN / m). The weld slag generated during the welding process is initially liquid. The necessary condition for solid-liquid phase bonding is that the liquid can fully wet the surface of the adhered object. Therefore, stainless steel with a large surface energy and roughness is easily bonded by molten droplets and embedded in the surface micropores to form a metallurgical bond, thereby forming weld slag deposition.

[0069] Therefore, in this embodiment, an anti-sticking functional layer 214 is provided on the inner wall surface 213 of the welding cavity 21. Since the surface energy and Ra value of the anti-sticking functional layer 214 are smaller than those of the inner wall surface 213, when uncured and molten slag is sputtered onto the anti-sticking functional layer 214 during welding, the smooth anti-sticking functional layer 214 can reduce the possibility of the slag directly embedding into the welding cavity 21. The slag can roll off the smooth anti-sticking functional layer 214 in a spherical shape, which is beneficial for the subsequent removal of the slag.

[0070] Understandably, the "surface energy" mentioned above refers to the excess energy inherent in surface molecules compared to internal molecules. Surface energy is defined as the energy required to create a unit of new surface area in a solid, and its standard unit is joules per square meter (J / m²). 2 According to dimensional equivalence, it is also commonly expressed in Newtons per meter (N / m). This value reflects the chemical activity and physical stability of a solid surface and is a key parameter that determines its interfacial behavior, such as wettability, adsorption, and adhesion.

[0071] The surface energy is measured as follows (taking the contact angle method as an example, the surface energy is calculated by measuring the contact angle of the liquid on the solid surface. The larger the contact angle, the lower the surface energy is usually):

[0072] Sample preparation: Clean the surface of the sample to be tested (e.g., wipe with alcohol or acetone).

[0073] Droplet addition: Using a microsyringe, a drop of pure liquid (e.g., ultrapure water) with known surface tension is added to the sample surface.

[0074] Image acquisition: A high-speed camera using a contact angle meter is used to quickly capture side images of the droplet.

[0075] Angle calculation: The instrument software will automatically draw a tangent at the interface of the liquid-solid-gas three phases and calculate the contact angle (θ) in degrees.

[0076] Analysis and calculation: Repeat the above steps with another liquid (such as diiodomethane), and use two different contact angle values ​​to calculate the surface energy of the solid surface using a mathematical model (such as the OWRK method).

[0077] The aforementioned "surface roughness" is a general term used to quantitatively characterize the degree of unevenness in the microscopic profile of a solid surface. It can be measured using any one of the parameters Ra, Rz, and Rq. In other words, surface roughness encompasses multiple quantitative parameters such as Ra, Rz, and Rq. Among these, Ra, by measuring the absolute distance from each point on the profile line to the center line and calculating its average value, directly reflects the overall smoothness of the surface with a single numerical value. It is the core indicator for defining surface roughness and the most widely used acceptance criterion in industry. The Ra value (arithmetic mean deviation of the profile) is the most basic surface roughness evaluation parameter, and the two constitute the relationship between the overall concept and specific indicators in the evaluation system.

[0078] The Ra value of surface roughness is calculated as follows:

[0079] Sample fixation: Secure the sample stably on the instrument's measuring platform.

[0080] Select parameters: Set the measurement length and scanning speed.

[0081] Start measurement: Turn on the instrument and gently touch the surface with the diamond probe and move it across it at a constant speed.

[0082] Data generation: The instrument records the vertical movement trajectory of the probe and generates a two-dimensional contour curve.

[0083] Results output: The software automatically calculates and outputs the most important roughness indicators (such as Ra arithmetic mean deviation and Rz maximum height) based on the profile curve. The larger these values ​​are, the greater the roughness.

[0084] In some examples, optionally, the surface roughness Ra value of the anti-stick functional layer 214 is less than or equal to 0.5 μm, and / or the surface energy of the anti-stick functional layer 214 is less than or equal to 30 mN / m.

[0085] The above technical solutions include multiple implementation methods. One method is that the surface roughness Ra value of the anti-adhesive functional layer 214 is less than or equal to 0.5 μm, and the surface energy of the anti-adhesive functional layer 214 is less than the surface energy of the inner wall surface 213. Another method is that the surface roughness Ra value of the anti-adhesive functional layer 214 is less than or equal to the roughness Ra value of the inner wall surface 213, and the surface energy of the anti-adhesive functional layer 214 is less than or equal to 30 mN / m. Yet another method is that the surface roughness Ra value of the anti-adhesive functional layer 214 is less than or equal to 0.5 μm, and the surface energy of the anti-adhesive functional layer 214 is less than or equal to 30 mN / m.

[0086] By controlling the surface roughness Ra value of the anti-sticking functional layer 214 to be less than or equal to 0.5 μm, the anti-sticking functional layer 214 can achieve a smooth state close to that of a mirror. This reduces the actual contact area between the molten droplet and the surface of the anti-sticking functional layer 214, weakens the mechanical anchoring effect between the two, makes it difficult for the molten droplet to penetrate and lock into the anti-sticking functional layer 214, and makes it easier for the molten droplet to detach from the smooth surface after it solidifies into weld slag.

[0087] By controlling the surface energy of the anti-sticking functional layer 214 to be less than or equal to 30mN / m, the low surface energy anti-sticking functional layer 214 has extremely poor wettability to the droplet, and the contact angle of the droplet surface will be significantly increased, reducing the intermolecular force between the droplet and the surface of the anti-sticking functional layer 214. This makes it difficult for the weld slag formed after the droplet solidifies to spread and adhere tightly to the surface. Under the action of minimal external forces such as gravity, vibration or wind, the weld slag can be removed from the welding cavity 21.

[0088] As can be seen from the above description, in this embodiment, the surface roughness Ra value of the anti-sticking functional layer 214 is designed to be less than or equal to 0.5μm, and the surface energy of the anti-sticking functional layer 214 is less than or equal to 30mN / m. Both of these can improve the smoothness of the anti-sticking functional layer 214 and reduce the possibility of weld slag adhering to the cavity.

[0089] Combined with appendix Figure 4 and 5 As shown, in some examples, the anti-stick functional layer 214 may optionally include a first coating layer 2141, at least a portion of which is a ceramic layer.

[0090] The ceramic materials include one or more of alumina, zirconium oxide, silicon carbide, and boron nitride, which will not be listed one by one in this embodiment.

[0091] Ceramic materials have the advantages of high surface hardness, low surface energy and roughness, high temperature resistance, stable chemical properties and low cost. They can effectively resist the mechanical interlocking of molten welding slag and reduce the interfacial bonding force between welding slag and coating, making it difficult for welding slag to wet and spread, thereby reducing the possibility of welding slag adhering to the welding cavity 21 and facilitating the removal of welding slag in the future.

[0092] When the first coating layer 2141 includes ceramic material, ceramic coating can be applied to the inner wall surface 213 by plasma spraying technology, and then cured at high temperature to form a ceramic layer.

[0093] Furthermore, after the ceramic layer is formed, the ceramic surface coating can be precisely ground to make its surface roughness as low as possible, eliminating microscopic uneven surfaces, so that the Ra of the ceramic layer is less than 0.5μm.

[0094] In some examples, optionally, the maximum thickness L1 of the first coating layer 2141 is less than or equal to 0.5 mm.

[0095] The maximum thickness L1 of the first coating layer 2141 can be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.4mm and 0.5mm, etc., which will not be listed in detail in this embodiment.

[0096] Designing the maximum thickness L1 of the first coating layer 2141 to be less than or equal to 0.5 mm can form a continuous and dense ceramic barrier. This reduces weld slag adhesion and also reduces the stress difference between the first coating layer 2141 and the inner wall surface 213 due to their different coefficients of thermal expansion, thereby reducing the risk of coating cracking. In addition, designing the maximum thickness of the first coating layer 2141 to be relatively small can also reduce production costs.

[0097] Combined with appendix Figure 4 and 5 As shown, in some examples, the non-stick functional layer 214 may optionally include a second coating layer 2142 disposed on the first coating layer 2141, the second coating layer 2142 being used to fill the pores on the surface of the first coating layer 2141 facing away from the inner wall surface 213.

[0098] The second coating layer 2142 can be applied to the first coating layer 2141 by spraying, brushing or other processes. The second coating layer 2142 mainly plays the role of sealing and reinforcement. The second coating layer 2142 can be the glaze described below, or it can be metal-ceramic composite powder or nano-ceramic slurry.

[0099] The second coating layer 2142 fills the pores on the surface of the first coating layer 2141 facing away from the inner wall surface 213, reducing the porosity of the first coating layer 2141 and thus reducing the possibility of molten weld slag mechanically anchoring in the pores. Furthermore, the second coating layer 2142 makes the surface of the anti-sticking functional layer 214 denser and smoother, thereby reducing the adhesion between the weld slag and the coating surface. This allows the weld slag to more easily detach automatically under interfacial stress after cooling and shrinkage, further reducing the possibility of weld slag adhering to the welding cavity 21.

[0100] In some examples, optionally, the Ra value of the roughness of the second coating layer 2142 is less than the Ra value of the roughness of the first coating layer 2141.

[0101] The Ra value for surface roughness has been explained above, and will not be repeated in this embodiment.

[0102] The Ra value of the roughness of the second coating layer 2142 is less than the Ra value of the roughness of the first coating layer 2141, which can improve the anti-sticking performance of the surface of the anti-sticking functional layer 214, making it difficult for the welding slag to find an anchor point, thus fundamentally weakening the physical basis of adhesion.

[0103] In some examples, the second coating layer 2142 may optionally be a glaze layer.

[0104] The glaze layer is a glassy inorganic coating formed by solidification after high-temperature melting. The main components of the glaze layer may include silicon dioxide, boron oxide, sodium oxide, etc., and aluminum oxide, zirconium oxide, etc. may be added according to performance requirements to improve hardness, chemical stability and thermal expansion matching.

[0105] The glaze layer can be formed on the surface of the first coating layer 2141 by processes such as glazing or dipping, and can fill the gaps in the ceramic material.

[0106] The glassy, ​​dense layer that the glaze can form after melting can better fill the pores and gaps on the surface of the ceramic layer, reducing the physical anchor points where weld slag can adhere, thus significantly reducing the possibility of weld slag adhesion; moreover, the glaze layer is relatively smooth, making it difficult for the molten weld slag to automatically peel off by its own shrinkage stress after cooling, achieving a better anti-sticking effect and easier subsequent cleaning.

[0107] In some examples, optionally, the maximum thickness L2 of the glaze layer is less than the maximum thickness of the first coating layer 2141.

[0108] For example, the maximum thickness L2 of the glaze layer can be 0.01 mm to 0.2 mm, or other thickness ranges, as long as it is less than the maximum thickness of the first coating layer 2141.

[0109] The maximum thickness L2 of the glaze layer is less than the maximum thickness of the first coating layer 2141 designed. While filling the gaps in the ceramic layer and improving the smoothness of the anti-stick functional layer 214, it will not over-cover and change the structural strength and heat resistance of the ceramic layer. This allows the anti-stick functional layer 214 to have both anti-stick, high temperature resistance, and wear resistance properties.

[0110] Combined with appendix Figure 5 As shown, in some examples, the inner wall surface 213 is optionally an uneven surface with a plurality of recesses 2131 and / or protrusions 2132, and the anti-stick functional layer 214 engages with the recesses 2131 and / or protrusions 2132.

[0111] The presence of at least one of the recess 2131 and the convex portion 2132 can make the inner wall surface 213 form an uneven rough surface of the recess 2131. The recess 2131 and the convex portion 2132 can be formed by sandblasting on the inner wall surface 213, or by processes such as shot peening, rough turning, rough milling or chemical etching.

[0112] The inner wall surface 213 is designed to be uneven, forming multiple anchor points that engage with the anti-adhesive functional layer 214, thereby improving the connection stability between the anti-adhesive functional layer 214 and the inner wall surface 213 and reducing the possibility of the anti-adhesive functional layer 214 detaching from the inner wall surface 213.

[0113] In some examples, optionally, the roughness Ra value of the inner wall surface 213 is greater than or equal to 3.2 μm.

[0114] The roughness Ra value of the inner wall surface 213 is greater than or equal to 3.2 μm. For example, the roughness Ra value of the inner wall surface 213 can be 3.2 μm, 3.5 μm, 4 μm, 4.3 μm and 4.5 μm, etc. This embodiment will not list them in detail.

[0115] The roughness Ra value of the inner wall surface 213 is designed to be greater than or equal to 3.2 μm, which increases the actual contact area between the inner wall surface 213 and the first coating layer 2141, provides a strong mechanical anchoring force for the first coating layer 2141, improves the connection stability between the anti-stick functional layer 214 and the inner wall surface 213, and can reduce the possibility of the first coating layer 2141 peeling off.

[0116] Combined again with the appendix Figure 1 As shown, in some examples, the battery welding apparatus 100 may optionally include a blower mechanism 30. The welding nozzle 20 has an air inlet 22 and an air outlet 23 on its surface facing the welding mechanism 10, which are respectively connected to the welding cavity 21. The air inlet 22 is located on one side of the first opening 211 along the first direction X, and the air outlet 23 is located on the other side of the first opening 211 along the first direction X. The first direction X intersects the arrangement direction of the first opening 211 to the second opening 212. The blower mechanism 30 is configured to blow an airflow through the air inlet 22 to the welding cavity 21 to remove welding slag, and the air outlet 23 is used to discharge welding slag and the airflow of the blower mechanism 30.

[0117] The blower mechanism 30 may include an air source generator, which may be a positive pressure blower or other device capable of generating airflow. The blower mechanism 30 may also include a pipe or nozzle for connecting to the air inlet 22. The pipe or nozzle is connected to the air source and is used to blow air into the air inlet 22.

[0118] The main function of the blower mechanism 30 is to blow airflow into the welding chamber 21 through the air inlet 22, and the airflow will carry the welding slag away from the welding chamber 21 through the air outlet 23, thereby realizing the discharge of welding slag.

[0119] The blower mechanism 30 actively blows away the slag particles that are still in a high-temperature molten or semi-molten state from the welding area, which can reduce the possibility of further slag adhering to the welding cavity 21, reduce slag residue from the source, and reduce the difficulty and workload of post-weld cleaning.

[0120] In addition, the air inlet 22 is located on one side of the first opening 211 along the first direction X, and the air outlet 23 is located on the other side of the first opening 211 along the first direction X. Compared with the design of the air inlet 22 and the air outlet 23 as adjacent, the airflow path can be extended, so that the airflow can carry out more welding slag and improve the slag removal efficiency.

[0121] In some embodiments, an inert gas (such as argon) can be used as the gas source. The inert gas can also help isolate the air and reduce oxidation in the welding area, thereby improving the welding quality while cleaning.

[0122] Combined again with the appendix Figure 1 As shown, in some examples, the battery welding apparatus 100 may optionally include an adsorption mechanism 40 connected to the air outlet 23 and used for negative pressure adsorption of welding slag.

[0123] The adsorption mechanism 40 may include a negative pressure generating element and a collection container connected in communication. In some embodiments, the adsorption mechanism 40 may also include a filter element. The negative pressure generating element may be a vacuum pump or a centrifugal fan.

[0124] The negative pressure generator generates negative pressure, which acts on the inside of the welding chamber 21 through the air outlet 23. Under the combined action of the negative pressure generator and the air source generator, the welding chamber 21 forms a stable outward directional airflow. This airflow carries the welding slag particles out of the welding chamber 21 and, after being filtered by the filter, is finally collected into the collection container.

[0125] By using the negative pressure adsorption mechanism 40 to adsorb welding slag, and working in conjunction with the blowing mechanism, the efficiency and effect of welding slag removal can be further improved, and the possibility of welding slag remaining in the welding cavity 21 can be reduced.

[0126] In some examples, the battery welding apparatus 100 may optionally include a cover plate 50 located between the welding mechanism 10 and the welding nozzle 20. The welding nozzle 20 is mounted on the side of the cover plate 50 away from the welding mechanism 10. The cover plate 50 has a first through hole 51 communicating with the first opening 211 and a second through hole 52 communicating with the air inlet 22. The air outlet 23 includes a groove 231 on the surface of the welding nozzle 20 facing the cover plate 50. The groove 231 has an opening at each end along the first direction X. One opening of the groove 231 is used to communicate with the welding chamber 21, and the other opening is used to discharge welding slag. The surface of the cover plate 50 away from the welding mechanism 10 and the groove 231 form a slag discharge channel.

[0127] The cover plate 50 and the welding nozzle 20 can be connected as one piece by mechanical connection methods such as bolts or welding.

[0128] The cover plate 50 mainly serves to integrate and install the welding nozzle 20, protect the welding nozzle 20, and improve the stability of the welding nozzle 20 during the welding process.

[0129] The cover plate 50 is provided with a first through hole 51 and a second through hole 52. The number of the first through holes 51 matches the number of the first openings 211, and the first through holes 51 and the first openings 211 have the same size and shape. The laser passes through the first through holes 51, the first openings 211 and the welding cavity 21 to reach the workpiece 200 to be welded for welding operations.

[0130] The second through hole 52 is mainly used to connect the blower mechanism 30 and the air inlet 22. The airflow of the blower mechanism 30 passes through the second through hole 52, the air inlet 22 and the welding cavity 21, and is finally discharged through the air outlet 23 to remove the welding slag.

[0131] In addition, the cover plate 50 and the groove 231 of the welding nozzle 20 in this embodiment form a slag discharge channel. The structure is ingenious and multifunctional. Compared with the method of directly opening a through hole in the welding nozzle 20, it is easier to process the groove 231 on the surface of the welding nozzle 20.

[0132] In some examples, optionally, there are multiple welding nozzles 20, which are spaced apart and installed on the cover plate 50 along a first direction X and / or a second direction Y. The second direction Y intersects the arrangement direction of the first opening 211 to the second opening 212 and intersects the first direction X.

[0133] In this embodiment, the first direction X can be the length direction of the welding nozzle 20, and the second direction Y can be the width direction of the welding nozzle 20.

[0134] Taking the two welding nozzles 20 in the figure as an example, the two welding nozzles 20 are arranged at intervals along the first direction X, and can weld the two adapter pieces at the same time. Of course, the specific number of welding nozzles 20 can be more.

[0135] Multiple welding nozzles 20 can be installed using the cover plate 50, thereby enabling simultaneous welding of multiple parts 200 to be welded, thus improving welding efficiency.

[0136] Based on the battery welding apparatus 100 described above, this application provides a battery production system including the battery welding apparatus 100 described above.

[0137] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application.

[0138] A battery welding apparatus 100 includes a welding mechanism 10 and a welding nozzle 20. The welding mechanism 10 is used to weld a workpiece 200. The welding nozzle 20 has a through-hole welding cavity 21. The welding cavity 21 has a first opening 211 and a second opening 212 facing opposite directions. The first opening 211 faces the welding mechanism 10, and the second opening 212 faces the workpiece 200. An anti-stick functional layer 214 is provided on the inner wall surface 213 of the welding cavity 21. The surface energy of the anti-stick functional layer 214 is less than the surface energy of the inner wall surface 213, and the Ra value of the roughness of the anti-stick functional layer 214 is less than the Ra value of the roughness of the inner wall surface 213. The Ra value of the surface roughness of the anti-stick functional layer 214 is less than or equal to 0.5 μm, and the surface energy of the anti-stick functional layer 214 is less than or equal to 30 mN / m. The anti-stick functional layer 214 includes a first coating layer 2141, at least a portion of which is a ceramic layer. The maximum thickness of the first coating layer 2141 is less than or equal to 0.5 mm. The anti-stick functional layer 214 further includes a second coating layer 2142 disposed on the first coating layer 2141, the second coating layer 2142 being used to fill the pores on the surface of the first coating layer 2141 facing away from the inner wall surface 213. The Ra value of the roughness of the second coating layer 2142 is less than the Ra value of the roughness of the first coating layer 2141. The second coating layer 2142 is a glaze layer. The maximum thickness of the glaze layer is less than the maximum thickness of the first coating layer 2141. The inner wall surface 213 is an uneven surface with multiple recesses 2131 and / or protrusions 2132, and the anti-stick functional layer 214 engages with the recesses 2131 and / or protrusions 2132. The Ra value of the roughness of the inner wall surface 213 is greater than or equal to 3.2 μm. The battery welding apparatus 100 also includes a blower mechanism 30. The welding nozzle 20 has an air inlet 22 and an air outlet 23 on its surface facing the welding mechanism 10, respectively connected to the welding chamber 21. The air inlet 22 is located on one side of the first opening 211 along a first direction X, and the air outlet 23 is located on the other side of the first opening 211 along the first direction X. The first direction X intersects the arrangement direction from the first opening 211 to the second opening 212. The blower mechanism 30 is configured to blow airflow through the air inlet 22 into the welding chamber 21 to remove welding slag, and the air outlet 23 is used to discharge welding slag and the airflow from the blower mechanism 30. The battery welding apparatus 100 also includes an adsorption mechanism 40, which is connected to the air outlet 23 and is used for negative pressure adsorption of welding slag.The battery welding apparatus 100 also includes a cover plate 50, which is located between the welding mechanism 10 and the welding nozzle 20. The welding nozzle 20 is installed on the side of the cover plate 50 away from the welding mechanism 10. The cover plate 50 has a first through hole 51 communicating with the first opening 211 and a second through hole 52 communicating with the air inlet 22. The air outlet 23 includes a groove 231 on the surface of the welding nozzle 20 facing the cover plate 50. The groove 231 has an opening at each end along the first direction X. One opening of the groove 231 is used to connect to the welding chamber 21, and the other opening is used to discharge welding slag. The surface of the cover plate 50 away from the welding mechanism 10 and the groove 231 form a slag discharge channel. There are multiple welding nozzles 20, which are arranged at intervals along the first direction X and / or the second direction Y on the cover plate 50. The second direction Y intersects the arrangement direction of the first opening 211 to the second opening 212 and intersects the first direction X.

[0139] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0140] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A battery welding apparatus, characterized in that, include: Welding equipment, used for welding parts to be welded; The welding nozzle has a welding cavity that extends through itself. The welding cavity has a first opening and a second opening facing opposite directions. The first opening faces the welding mechanism, and the second opening faces the workpiece to be welded. An anti-sticking functional layer is provided on the inner wall surface of the welding cavity. The surface energy of the anti-sticking functional layer is less than the surface energy of the inner wall surface, and the roughness of the anti-sticking functional layer is less than the roughness of the inner wall surface.

2. The battery welding apparatus according to claim 1, characterized in that, The surface roughness Ra value of the anti-stick functional layer is less than or equal to 0.5 μm, and / or the surface energy of the anti-stick functional layer is less than or equal to 30 mN / m.

3. The battery welding apparatus according to claim 2, characterized in that, The anti-stick functional layer includes a first coating layer, at least a portion of which is a ceramic layer.

4. The battery welding apparatus according to claim 3, characterized in that, The maximum thickness of the first coating layer is less than or equal to 0.5 mm.

5. The battery welding apparatus according to claim 3, characterized in that, The anti-stick functional layer further includes a second coating layer disposed on the first coating layer, the second coating layer being used to fill the pores on the surface of the first coating layer that is away from the inner wall surface.

6. The battery welding apparatus according to claim 5, characterized in that, The Ra value of the roughness of the second coating layer is less than the Ra value of the roughness of the first coating layer.

7. The battery welding apparatus according to claim 6, characterized in that, The second coating layer is a glaze layer.

8. The battery welding apparatus according to claim 7, characterized in that, The maximum thickness of the glaze layer is less than the maximum thickness of the first coating layer.

9. The battery welding apparatus according to any one of claims 1-8, characterized in that, The inner wall surface is an uneven surface with multiple recesses and / or multiple protrusions, and the anti-stick functional layer engages with the recesses and / or the protrusions.

10. The battery welding apparatus according to any one of claims 1-8, characterized in that, The roughness Ra value of the inner wall surface is greater than or equal to 3.2 μm.

11. The battery welding apparatus according to any one of claims 1-8, characterized in that, The battery welding device further includes a blower mechanism. The welding nozzle has an air inlet and an air outlet on its surface facing the welding mechanism, which are respectively connected to the welding cavity. The air inlet is located on one side of the first opening along a first direction, and the air outlet is located on the other side of the first opening along the first direction. The first direction intersects the arrangement direction from the first opening to the second opening. The blower mechanism is configured to blow airflow through the air inlet into the welding cavity to remove welding slag, and the air outlet is used to discharge welding slag and the airflow of the blower mechanism.

12. The battery welding apparatus according to claim 11, characterized in that, The battery welding device also includes an adsorption mechanism, which is connected to the air outlet and is used to adsorb welding slag under negative pressure.

13. The battery welding apparatus according to claim 11, characterized in that, The battery welding device further includes a cover plate located between the welding mechanism and the welding nozzle. The welding nozzle is installed on the side of the cover plate away from the welding mechanism. The cover plate has a first through hole communicating with the first opening and a second through hole communicating with the air inlet. The air outlet includes a groove on the surface of the welding nozzle facing the cover plate. The groove has an opening at each end along the first direction. One opening of the groove is used to connect to the welding chamber, and the other opening is used to discharge welding slag. The surface of the cover plate away from the welding mechanism and the groove form a slag discharge channel.

14. The battery welding apparatus according to claim 13, characterized in that, The number of welding nozzles is multiple, and the multiple welding nozzles are arranged at intervals along the first direction and / or the second direction on the cover plate. The second direction intersects the arrangement direction from the first opening to the second opening and intersects the first direction.

15. A battery production system, characterized in that, Includes the battery welding apparatus as described in any one of claims 1-14.

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