Welding device and battery production system

Abstract

The embodiment of the utility model provides a welding device and a battery production system, and relates to the technical field of batteries. The welding device comprises a base table and a dust removal cover, the base table is provided with a welding cavity, and the welding cavity is provided with a first opening; the dust removal cover comprises a first side wall, a second side wall and an exhaust pipe, a welding channel is defined by the first side wall, a dust removal channel is defined by the second side wall and the first side wall, the dust removal channel is communicated with the first opening, the exhaust pipe is communicated with the dust removal channel, and the part, between the exhaust pipe and the base table, of the dust removal channel is provided with a necking section with a reduced through-flow section. The necking section is arranged on the dust removal channel, the flow speed of airflow can be increased when the airflow passes through the narrow necking section, the airflow speed of the necking section is closer to the airflow speed of the end, away from the dust removal channel, of the exhaust pipe, and the uniformity of the airflow speed of the dust removal channel and the airflow speed of the exhaust pipe is improved; therefore, dust and welding slag in the welding cavity can be better driven to be discharged out of the dust removal cover through the dust removal channel and the exhaust pipe, and the dust removal efficiency and effect are improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to a welding device and a battery production system. Background Art

[0002] Battery devices are widely used in electronic devices, such as mobile phones, laptop computers, battery cars, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools, etc.

[0003] Welding is required in the production process of battery devices. Dust hoods are used to remove welding slag during welding. However, when the dust hoods of related technologies use negative pressure to absorb welding slag, the wind speed is lower the closer to the welding area, resulting in poor removal of dust and welding slag. Therefore, how to improve the uniformity of wind speed in each area inside the dust hood, thereby improving the dust removal effect, is a research direction in battery technology. Utility Model Content

[0004] The present application provides a welding device and a battery production system, which can improve the uniformity of wind speed in each area inside a dust hood, thereby improving the dust removal effect.

[0005] In the first aspect, an embodiment of the present application provides a welding device, including a base and a dust hood, the base is provided with a welding cavity, and the welding cavity is provided with a first opening; the dust hood is installed on the base, and includes a first side wall, a second side wall and an exhaust duct, the first side wall encloses a welding channel, the second side wall is arranged around the first side wall and encloses a dust removal channel with the first side wall, the dust removal channel is closed on the side away from the base, and the dust removal channel is communicated with the first opening on the side facing the base, the exhaust duct is connected to the second side wall and is communicated with the dust removal channel, the part of the dust removal channel between the exhaust duct and the base includes an inlet section and a necking section arranged in sequence along a direction away from the first opening, and the flow cross-sectional area of ​​the necking section is smaller than the flow cross-sectional area of ​​the inlet section.

[0006] By adopting the above technical scheme, a tapered section is provided on the dust removal channel, and the flow velocity of the air flow will increase when passing through the relatively narrow tapered section, so that the air flow velocity in the tapered section is closer to the air flow velocity at the end of the exhaust duct away from the dust removal channel, thereby improving the uniformity of the air flow velocity in the dust removal channel and the exhaust duct, thereby better driving the dust and welding slag in the welding chamber to be discharged out of the dust removal hood through the dust removal channel and the exhaust duct, thereby improving the dust removal efficiency and effect, and thus improving the welding quality.

[0007] In some embodiments of the present application, the first side wall and / or the second side wall is provided with a protruding structure, and the protruding structure is used to enclose the necking section.

[0008] By adopting the technical solution, the protruding structure of the dust removal channel is used to enclose the shrinkage section, which has a simple structure and is easy to process.

[0009] In some embodiments of the present application, the protruding structure includes an annular protrusion arranged along the circumference of the dust removal channel.

[0010] By adopting the above technical solution, the protruding structure is designed to include an annular protrusion, which can form an annular narrowing space in the circumference of the dust removal channel, thereby better accelerating the airflow passing therethrough.

[0011] In some embodiments of the present application, there are multiple annular protrusions, and the multiple annular protrusions are arranged in sequence in a stepped manner along the direction from the dust cover to the base.

[0012] By adopting the above technical solution, the number of annular protrusions is designed to be multiple, which can extend the length of the necking section and accelerate the airflow multiple times, further improving the uniformity of the airflow velocity in the dust removal channel and the exhaust duct.

[0013] In some embodiments of the present application, the base is provided with a shielding gas channel connected to the welding chamber, the shielding gas channel is used to introduce shielding gas into the welding chamber, and the side wall of the welding chamber is provided with a flow balancing structure, and the flow balancing structure is used to improve the uniformity of the shielding gas content in the welding chamber.

[0014] By adopting the above technical solution, a flow equalization structure is provided on the side wall of the welding chamber, so that the uniformity of the shielding gas content in the welding chamber can be improved through the flow equalization structure, thereby reducing the phenomenon of welding slag being easily generated due to the shielding gas content being too low in local areas of the welding chamber.

[0015] In some embodiments of the present application, the flow balancing structure includes a plurality of guide plates, and the plurality of guide plates are arranged at intervals along the circumference of the welding cavity.

[0016] By adopting the above technical solution, the flow balancing structure is designed as multiple guide plates. The multiple guide plates can form multiple flow channels, which can guide the airflow entering the welding cavity so that the airflow can flow evenly into the welding cavity. It not only has a simple structure but also has a good flow balancing effect.

[0017] In some embodiments of the present application, along the arrangement direction from the base to the dust hood, the welding chamber includes an entrance section, a middle section and an exit section, the entrance section is directly connected to the protective gas channel, the guide plate is arranged at the entrance section, and the radial dimension of the entrance section gradually increases along the direction approaching the dust hood.

[0018] By adopting the above technical solution, a guide plate is set at the inlet section, which can directly play a role in equalizing the flow of the incoming protective gas, so that the airflow flows more evenly into the middle section and the outlet section. At the same time, the inlet section is designed as a conical structure, so that the airflow can diffuse more evenly toward the middle section.

[0019] In some embodiments of the present application, the length direction of the exhaust duct forms an acute angle with the arrangement direction from the base to the dust cover.

[0020] By adopting the above technical solution, the length direction of the exhaust duct and the arrangement direction from the base to the dust hood are designed to be at an acute angle, which can reduce the resistance of the air flow in the exhaust duct. Compared with the method in which the length direction of the exhaust duct and the arrangement direction from the base to the dust hood are at a right angle, it can facilitate the circulation of air flow.

[0021] In some embodiments of the present application, the length direction of the exhaust duct forms an acute angle of 30° to 60° with the arrangement direction from the base to the dust cover.

[0022] By adopting the above technical solution, the length direction of the exhaust duct and the arrangement direction from the base to the dust collector are designed to be at an acute angle of 30° to 60°, which can further reduce the resistance of the airflow in the exhaust duct and make it more convenient to discharge welding slag and dust from the exhaust duct.

[0023] In some embodiments of the present application, one end of the first side wall close to the base extends into the welding cavity through the first opening, and the side wall of the welding cavity and the part of the first side wall located in the welding cavity enclose an extended channel, and the extended channel is respectively connected to the dust removal channel and the welding cavity.

[0024] By adopting the above technical solution, one end of the first side wall close to the base is extended into the welding cavity to form an extended channel with the side wall of the welding cavity. The welding slag and dust in the welding cavity can more easily enter the dust removal channel, thereby improving the dust removal efficiency and effect.

[0025] In some embodiments of the present application, the inner wall surface of the welding cavity is smoothly connected to the inner wall surface of the second side wall.

[0026] By adopting the above technical solution, the inner wall surface of the welding cavity is smoothly connected with the inner wall surface of the second side wall, so that the extended channel has better smoothness and is convenient for airflow and welding slag to enter.

[0027] In some embodiments of the present application, the second side wall is provided with a connecting port, one end of the exhaust duct is sealed and connected to the second side wall at the connecting port, and is connected to the dust removal channel through the connecting port.

[0028] By adopting the above technical solution, a connecting port is provided on the second side wall, and the installation of the exhaust duct and the connection between the exhaust duct and the dust removal channel are realized through the sealed connection between the connecting port and the exhaust duct.

[0029] In some embodiments of the present application, the dust cover further includes a top wall, and an end of the second side wall facing away from the base and an end of the first side wall facing away from the base are connected to each other through the top wall.

[0030] By adopting the above technical solution, the second side wall and the first side wall are connected via the top wall, and the dust removal passage is sealed away from the side of the base.

[0031] In a second aspect, an embodiment of the present application provides a battery production system, comprising a welding device as described in any one of the above technical solutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0033] Figure 1 A schematic diagram of the structure of a welding device provided in an embodiment of the present application;

[0034] Figure 2 A side view of a welding device provided in an embodiment of the present application;

[0035] Figure 3 A top view of a welding device provided in an embodiment of the present application;

[0036] Figure 4 for Figure 3 A magnified view of part a;

[0037] Figure 5 for Figure 3 AA cross-section diagram;

[0038] Figure 6 for Figure 5 A magnified view of part b;

[0039] Figure 7 for Figure 5 Enlarged view of part c.

[0040] The reference numerals of the specific embodiments are as follows:

[0041] 100. Welding equipment;

[0042] 10. base; 11. welding chamber; 111. inlet section; 1111. flow equalization structure; 11111. guide plate; 112. middle section; 113. outlet section; 1131. first opening; 114. fixing member; 12. protective gas channel;

[0043] 20. dust cover; 21. first side wall; 22. second side wall; 221. communication port; 23. exhaust pipe; 24. welding channel; 25. dust removal channel; 251. necking section; 2511. protruding structure; 25111. annular protrusion; 252. inlet section; 253. first end; 254. second end; 26. extension channel; 27. top wall;

[0044] X, first direction; Y, second direction. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0046] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0047] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0048] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, H and / or B can represent: H exists alone, H and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0050] In the embodiments of the present application, the same reference numerals represent 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 the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0051] The term “plurality” used in this application refers to two or more (including two).

[0052] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, in parallel or in mixed connection through a busbar component.

[0053] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, a battery cell assembly may be a battery module, and a battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, a battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0054] In some embodiments, the battery device may be a battery pack, which includes a battery case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the battery case.

[0055] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the battery case by fixing the battery module in the battery case.

[0056] As an example, the battery cell assembly may also be housed in the battery case by directly fixing a plurality of battery cells to the battery case.

[0057] As an example, the battery case may include a first case and a second case. The first case and the second case are buckled together to form a closed space inside the battery case to accommodate the battery cell assembly. The closed space here means to cover or close, which may be sealed or unsealed. The first case may be a top cover or a bottom plate.

[0058] As an example, the battery case may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the battery case to accommodate the battery cell assembly.

[0059] As an example, the battery box can be used as part of the chassis structure of the vehicle. For example, the top cover of the battery box can become at least a part of the floor of the vehicle, or the frame of the battery box can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0060] In some embodiments, the battery device refers to an energy storage device, which includes a battery box, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, and the like.

[0061] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0062] The battery cell mentioned in the embodiments of the present application may include an electrode assembly and an electrolyte, and the electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive current collector and a positive active material layer, and the positive active material layer is coated on the surface of the positive current collector; the positive current collector includes a positive electrode coating area and a positive electrode ear connected to the positive electrode coating area, the positive electrode coating area is coated with a positive electrode active material layer, and the positive electrode ear is not coated with a positive electrode active material layer. Taking a lithium-ion battery cell as an example, the material of the positive current collector can be aluminum, and the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode coating area and a negative electrode tab connected to the negative electrode coating area, and the negative electrode coating area is coated with a negative electrode active material layer, and the negative electrode tab is not coated with a negative electrode active material layer. The material of the negative electrode current collector can be copper, and the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material can be carbon or silicon, etc. The material of the separator can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene), etc.

[0063] The battery device needs to undergo welding steps during its production. For example, the positive electrode of the cylindrical battery cell shell needs to be welded by laser or other means. During welding, the cylindrical battery cell is placed in a welding device, and a dust hood is provided above the welding device. During welding, it is necessary to fill the welding area of ​​the welding device with protective gas, and perform negative pressure exhaust on the dust hood. The dust hood is used to bring the welding slag generated during the welding process out of the welding area, thereby improving the welding quality and reducing the impact of the welding slag on the performance of the battery cell.

[0064] However, when the dust hood of the related technology is used, the suction port that generates negative pressure is relatively far away from the welding area, so the wind speed in the dust removal channel of the dust hood is lowest the farther away from the suction port and closer to the welding area, resulting in poor dust removal effect.

[0065] Therefore, how to improve the uniformity of the wind speed in each area of ​​the dust removal channel in the dust removal hood is an important topic in the research and development of the battery device and its related components.

[0066] In view of this, the present application provides a technical solution, which aims to solve the above-mentioned technical problems by providing a tapered section in the dust removal channel to increase the wind speed in the dust removal channel.

[0067] The following is combined with Figure 1-7 The welding device 100 provided in an embodiment of the present application is introduced.

[0068] Combined with Figure 1-6As shown, an embodiment of the present application provides a welding device 100, including a base 10 and a dust cover 20, the base 10 is provided with a welding chamber 11, and the welding chamber 11 is provided with a first opening 1131; the dust cover 20 is installed on the base 10, and includes a first side wall 21, a second side wall 22 and an exhaust duct 23, the first side wall 21 encloses a welding channel 24, the second side wall 22 is arranged around the first side wall 21 and encloses a dust removal channel 25 with the first side wall 21, the dust removal channel 25 is closed on the side away from the base 10, and the side of the dust removal channel 25 facing the base 10 is communicated with the first opening 1131, the exhaust duct 23 is connected to the second side wall 22, and is communicated with the dust removal channel 25, and the part of the dust removal channel 25 between the exhaust duct 23 and the base 10 includes an inlet section 252 and a necking section 251 arranged in sequence along a direction away from the first opening 1131, and the flow cross-sectional area of ​​the necking section 251 is smaller than the flow cross-sectional area of ​​the inlet section 252.

[0069] The welding device 100 can weld a battery device, for example, weld the outer surface of a cylindrical battery cell, and the welding method can be laser welding, ultrasonic welding, etc.

[0070] In some embodiments, the welding device 100 includes a welding assembly and a mounting assembly (not shown in the figure) in addition to the base 10 and the dust cover 20. The welding assembly can be located above the dust cover 20 during welding, and the assembly can be laser welded or ultrasonically welded. The mounting assembly is located below the base 10, and the mounting assembly can be a box or a frame structure for accommodating battery cells.

[0071] In some embodiments, the dust hood 20 is installed above the base 10 , and the installation method can be a detachable connection such as plug-in, snap-on, etc., or the dust hood 20 can be directly placed above the base 10 .

[0072] During welding, the battery cell is placed under the base 10, and the battery cell is fixed by the fixing member 114 in the welding cavity 11, and then the laser or ultrasonic wave can pass through the dust cover 20 and the welding cavity 11 inside the base 10, so as to weld the battery cell. The welding cavity 11 of the base 10 is used to protect the battery cell during welding. When the laser or ultrasonic wave passes through the welding cavity 11, a protective gas is introduced into the welding cavity 11 for welding protection. Then, impurities such as welding slag and dust in the welding cavity 11 during welding are discharged through the dust cover 20 of this embodiment.

[0073] The dust cover 20 includes a first side wall 21 and a second side wall 22. The first side wall 21 surrounds a welding channel 24. The welding channel 24 has an upper and lower opening structure so that laser or ultrasonic waves can enter the welding cavity 11 through the upper opening of the welding channel 24, the inner cavity of the welding channel 24 and the lower opening to perform welding of the battery device.

[0074] The dust cover 20 may be a structure that is narrow at the bottom and wide at the top. For example, along the direction away from the first opening 1131, the radial dimensions of the first side wall 21 and the second side wall 22 are designed to gradually increase, thereby facilitating the discharge of dust and welding slag.

[0075] The interval between the first side wall 21 and the second side wall 22 of this embodiment encloses a dust removal channel 25 arranged along the circumference of the dust removal cover 20. The dust removal channel 25 can be a closed-loop channel formed by an annular channel, a rectangular channel, etc. surrounding the first opening 1131, and has a length dimension along the arrangement direction from the base 10 to the dust removal cover 20.

[0076] The first end 253 of the dust removal channel 25 is in communication with the first opening 1131 . During welding, welding slag and dust enter into the welding chamber 11 , then enter into the dust removal channel 25 , and are subsequently discharged through the exhaust pipe 23 .

[0077] The exhaust duct 23 is connected to the side wall of the cover body, one end of the exhaust duct 23 is connected to the upper end of the dust removal channel 25 of this embodiment, and the other end of the exhaust duct 23 is connected to a negative pressure structure such as a fan. The negative pressure structure is used to generate negative pressure in the exhaust duct 23, thereby removing impurities such as dust and welding slag in the welding chamber 11 and the dust removal channel 25.

[0078] In order to improve the uniformity of the air flow velocity in the dust removal channel 25 and the exhaust duct 23, the dust removal channel 25 is provided with a tapered section 251 and an inlet section 252 in this embodiment. Along the direction away from the first opening 1131, the inlet section 252 and the tapered section 251 are arranged in sequence, and the flow cross-sectional size of the tapered section 251 is smaller than the flow cross-sectional size of the inlet section 252.

[0079] The dust removal channel 25 has opposite first and second ends 253 and 254 in the portion between the exhaust duct 23 and the base 10, wherein the first end 253 is directly connected to the first opening 1131, and the second end 254 is directly connected to the lower end of the exhaust duct 23, so that the dust removal channel 25 has a dimension along the arrangement direction from the first end 253 to the second end 254 in the portion between the exhaust duct 23 and the base 10.

[0080] Along the arrangement direction from the first end 253 to the second end 254, the dust removal channel 25 in this embodiment is designed to be an inlet section 252 and a necking section 251 arranged in sequence. The lengths of the inlet section 252 and the necking section 251 can be equal or similar, and of course there can also be a certain length difference between the two.

[0081] In this embodiment, the flow cross-sectional size of the inlet section 252 is larger than the flow cross-sectional size of the necking section 251. Compared with the method in which the flow cross-sectional size of the inlet section 252 is equal to that of the necking section 251, the airflow in the welding chamber 11 can enter the dust removal channel 25 more smoothly.

[0082] Moreover, when the airflow passes through the relatively narrow necking section 251, the flow velocity will increase, making the airflow velocity of the necking section 251 closer to the airflow velocity at the end of the exhaust pipe 23 away from the dust removal channel 25, thereby improving the uniformity of the airflow velocity of the dust removal channel 25 and the exhaust pipe 23, thereby better driving the dust and welding slag in the welding chamber 11 to be discharged out of the dust removal hood 20 through the dust removal channel 25 and the exhaust pipe 23, thereby improving the dust removal efficiency and effect, reducing the impact of residual particles on the surface of the battery cell, and improving the welding quality.

[0083] The flow velocity of the airflow in the constricted section 251 increases, and this phenomenon can be explained by the continuity equation and the Bernoulli equation in fluid mechanics. Specifically, when the airflow passes through the constricted section 251, the airflow velocity increases due to the effect of the continuity equation. At the same time, according to the Bernoulli equation, as the velocity increases, the pressure of the fluid decreases. This pressure reduction can lead to a further increase in the flow velocity because the fluid always flows from a high-pressure area to a low-pressure area.

[0084] Among them, the continuity equation is a basic equation in fluid mechanics, which states that in the flow of an incompressible fluid, the mass flow rate of the fluid is constant during the flow. For airflow in a pipe, this means that if the cross-sectional area of ​​the pipe decreases, the velocity of the airflow must increase to keep the mass flow rate constant. The Bernoulli equation describes the conservation of energy when a fluid flows along a streamline, which states that in the absence of friction and external work, the total energy of the fluid (including pressure energy, kinetic energy, and potential energy) is conserved during the flow.

[0085] The above-mentioned “flow cross-sectional size” refers to the cross-sectional area of ​​the dust removal channel parallel to the first direction X, specifically refers to the cross-sectional area of ​​the annular space enclosed by the first side wall 21 and the second side wall 22 parallel to the first direction X.

[0086] Combined with Figure 5 and 6 As shown, in some examples, optionally, the first side wall 21 and / or the second side wall 22 is provided with a protruding structure 2511 , and the protruding structure 2511 is used to surround the necked section 251 .

[0087] The above technical solution includes three implementation modes, one of which is as follows: Figure 5 As shown in the figure, a protruding structure 2511 is provided on the first side wall 21, and no protruding structure 2511 is provided on the second side wall 22. Another method is to provide a protruding structure 2511 on the second side wall 22, and no protruding structure 2511 is provided on the first side wall 21. Still another method is to provide a protruding structure 2511 on the first side wall 21, and also to provide a protruding structure 2511 on the second side wall 22. The latter two methods are not shown in the figure.

[0088] The protruding structure 2511 may be a protruding structure 2511 added to the first side wall 21 and / or the second side wall 22. Alternatively, the first side wall 21 and / or the second side wall 22 may be bent to form a protruding structure 2511 on one side and a recessed structure on the other side (this embodiment is not shown in the figure).

[0089] The protruding structure 2511 can be arranged along the circumference of the dust removal channel 25, or can be arranged along a part of the circumference, as long as it can increase the air flow speed at that location.

[0090] The protruding structure 2511 of the dust removal channel 25 is used to enclose the shrinkage section 251, which has a simple structure and is easy to process.

[0091] In some examples, optionally, the protruding structure 2511 includes an annular protrusion 25111 arranged circumferentially along the dust removal channel 25 .

[0092] When the protruding structure 2511 is an annular protrusion 25111, the cross-section of the dust removal channel 25 is also annular. The annular protrusion 25111 can make the dust removal channel 25 present a narrowed space along the circumferential direction in the area of ​​the necking section 251, so that the airflow can be better accelerated when passing through here.

[0093] In addition, in some embodiments, the cross-section of the annular protrusion 25111 forms a cross-sectional shape on both sides along the first direction X, and the first direction X is a direction perpendicular to the arrangement direction of the base 10 to the dust cover 20. The cross-sectional shape of the annular protrusion 25111 can be a right angle or trapezoid with side edges, or it can be an arc shape, etc., which are not listed one by one in this embodiment.

[0094] In some examples, optionally, there are multiple annular protrusions 25111, and the multiple annular protrusions 25111 are arranged in sequence in a stepped manner along the direction from the dust cover 20 to the base 10.

[0095] The number of the annular protrusions 25111 is designed to be multiple, where multiple means two or more, such as three as shown in the figure. Of course, the specific number can be designed according to specific needs.

[0096] While the multiple annular protrusions 25111 extend the length of the tapered section 251, the airflow velocity slows down when entering the gap between two adjacent annular protrusions 25111 and then is accelerated again. The airflow can be accelerated multiple times, further improving the uniformity of the airflow velocity in the dust removal channel 25 and the exhaust duct 23.

[0097] When there are multiple annular protrusions 25111 in this embodiment, and the first side wall 21 of the cover body is in the shape of a cone with increasing radial dimensions from bottom to top, the multiple annular protrusions 25111 can form a structure similar to an annular step.

[0098] Combined with Figure 3 , Attachment Figure 5 And attached Figure 7 As shown, in some examples, optionally, the base 10 is provided with a shielding gas channel 12 connected to the welding chamber 11, the shielding gas channel 12 is used to introduce shielding gas into the welding chamber 11, and the side wall of the welding chamber 11 is provided with a flow equalizing structure 1111, and the flow equalizing structure 1111 is used to improve the uniformity of the shielding gas content in the welding chamber 11.

[0099] The shielding gas channel 12 may be formed directly in the base 10 , and the number of shielding gas channels 12 may be one or more. One end of the shielding gas channel 12 is connected to the welding chamber 11 of the present embodiment, and the other end is connected to a shielding gas filling component (not shown in the figure). The shielding gas filling component may be a structure such as an air pump, which is used to introduce shielding gas into the welding chamber 11 through the shielding gas channel 12 .

[0100] The shielding gas may be nitrogen, argon, helium, etc., which are not listed one by one in this embodiment. The shielding gas can form an inert atmosphere during welding to prevent the metal in the molten pool from oxidizing with oxygen in the air, thereby avoiding weld oxidation and contamination of the weld area, and can also reduce the pores generated during welding, improve the environment of the weld, and improve the welding quality.

[0101] The reason for configuring the flow equalization structure 1111 is that when the shielding gas enters the welding chamber 11, since there is no flow guide structure and since the negative pressure of the exhaust duct 23 and the dust removal channel 25 are located at the peripheral edge of the welding chamber 11, it is easy for the shielding gas content in the middle part of the welding chamber 11 to be low while the shielding gas content in the surrounding areas is high, thereby affecting the welding quality.

[0102] Therefore, in this embodiment, a flow equalizing structure 1111 is provided on the side wall of the welding chamber 11, so that the uniformity of the shielding gas content in the welding chamber 11 can be improved through the flow equalizing structure 1111, thereby reducing the phenomenon that the shielding gas content in local areas of the welding chamber 11 is too low and welding slag is easily generated.

[0103] In some examples, optionally, the flow equalizing structure 1111 includes a plurality of guide plates 11111 , and the plurality of guide plates 11111 are arranged at intervals along the circumference of the welding cavity 11 .

[0104] The plurality of guide plates 11111 are arranged at intervals along the circumference of the welding cavity 11 , and specifically may be arranged at even intervals, that is, the distance between two adjacent guide plates 11111 is constant.

[0105] Multiple guide plates 11111 can form multiple flow channels arranged circumferentially along the welding chamber 11. When the shielding gas passes through the multiple guide plates 11111, it can be separated and guided so that the flow of shielding gas can flow evenly into the welding chamber 11. It not only has a simple structure but also has a good flow balancing effect.

[0106] In some examples, optionally, along the arrangement direction from the base 10 to the dust hood 20, the welding chamber 11 includes an entrance section 111, a middle section 112 and an exit section 113, the entrance section 111 is directly connected to the protective gas channel 12, and a guide plate 11111 is arranged at the entrance section 111, and the radial dimension of the entrance section 111 gradually increases along the direction approaching the dust hood 20.

[0107] The entrance section 111 is a section of the area closest to the welding surface of the battery device during welding, or the welding surface is directly located in the entrance section 111. The radial dimension of the middle section 112 can be constant or gradual, and the radial dimension of the outlet section 113 can also gradually increase from bottom to top. The outlet section 113 is provided with the above-mentioned first opening 1131.

[0108] After entering the inlet section 111 , the shielding gas is diverted by the intervals between the plurality of guide plates 11111 , so that the shielding gas can enter the middle section 112 and the outlet section 113 in a more uniform form.

[0109] The radial dimension of the inlet section 111 is designed to gradually increase from bottom to top, so that the airflow can form a diffusion trend when flowing toward the middle section 112 .

[0110] The above structure is provided with a guide plate 11111 at the inlet section 111, which can directly play a role in equalizing the flow of the incoming protective gas, so that the airflow flows more evenly into the middle section 112 and the outlet section 113. At the same time, the inlet section 111 is designed as a conical structure, so that the airflow can diffuse more evenly toward the middle section 112.

[0111] In some embodiments, the arrangement of the guide plates 11111 may be further optimized by setting each guide plate 11111 at an acute angle α to the radial direction of an adjacent inlet section 111 .

[0112] Specifically, a line connecting one end of each guide plate 11111 away from the center of the welding cavity 11 and the center of the welding cavity 11 is a radial direction adjacent to the guide plate 11111, and a length direction of a cross section of the guide plate 11111 forms an acute angle with the radial direction, and the acute angle may be 15°-60°, for example, 15°, 20°, 30°, 40°, 50° and 60°, etc., which are not listed one by one in this embodiment.

[0113] This design designs the guide plate 11111 to be at an acute angle to the radial direction of the inlet section 111, so that the airflow can generate a certain spiral flow trend after passing through the intervals between multiple guide plates 11111, so that the protective gas in the airflow can be evenly dispersed to various areas, further improving the uniformity of the protective gas content in the welding chamber 11.

[0114] Combined with Figure 5 As shown, in some examples, optionally, the length direction of the exhaust pipe 23 is set at an acute angle β with the arrangement direction from the base 10 to the dust cover 20.

[0115] There are three ways to set the length direction of the exhaust pipe 23 and the arrangement direction of the base 10 to the dust cover 20 (the second direction Y in the figure). The first way is that the length direction of the exhaust pipe is perpendicular to the second direction Y, and the exhaust pipe is set in a horizontal direction. The second way is that the length direction of the exhaust pipe is set along the second direction Y, and the exhaust pipe is set in a vertical direction. The third way is Figure 4 The length direction of the exhaust pipe 23 shown in FIG. 1 forms an acute angle with the second direction Y.

[0116] In the first method, since the dust removal channel 25 is inclined to discharge air upward, if the exhaust pipe is arranged in a horizontal direction, the air discharged from the dust removal channel 25 needs to make a large turn before entering the dust removal channel 25, which is not conducive to air discharge.

[0117] In the second method, if one wants to design the length direction of the exhaust pipe to be vertical, the exhaust pipe can only be installed on the top of the dust removal hood 20. The gas in the dust removal channel 25 needs a long path to reach the exhaust pipe, which is not conducive to air outlet.

[0118] The third method can make the air outlet directions of the exhaust pipe and the dust removal channel 25 close to or even consistent, thereby making air outlet more convenient.

[0119] Therefore, in this embodiment, the length direction of the exhaust duct 23 is designed to be at an acute angle to the arrangement direction from the base 10 to the dust cover 20. Compared with the method in which the length direction of the exhaust duct 23 is at a right angle to the arrangement direction from the base 10 to the dust cover 20, the circulation of air flow can be facilitated.

[0120] In some examples, optionally, the length direction of the exhaust pipe 23 and the arrangement direction from the base 10 to the dust cover 20 form an acute angle β of 30° to 60°.

[0121] The arrangement direction from the base 10 to the dust cover 20 is the second direction Y in the figure. The length direction of the exhaust duct 23 and the second direction Y can be at an angle of 30°, 40°, 45°, 55°, 55° and 60°, which can be specifically determined according to the inclination angle of the dust removal channel 25 relative to the vertical direction.

[0122] The length direction of the exhaust duct 23 and the arrangement direction from the base 10 to the dust cover 20 are designed to form an acute angle of 30° to 60°, which can further match the inclination angle of the arrangement direction from the first end 253 to the second end 254 of the dust removal channel 25 relative to the vertical direction, and can further reduce the resistance of the airflow flowing in the exhaust duct 23, making it more convenient for welding slag and dust to be discharged from the exhaust duct 23.

[0123] Combine again with Figure 5 As shown, in some examples, optionally, one end of the first side wall 21 close to the base 10 extends into the welding cavity 11 through the first opening 1131, and the side wall of the welding cavity 11 and the part of the first side wall 21 located in the welding cavity 11 enclose an extension channel 26, and the extension channel 26 is respectively connected to the dust removal channel 25 and the welding cavity 11.

[0124] The lower end of the first side wall 21 extends into the welding cavity 11 , so that the lower end of the first side wall 21 is lower than the lower end of the second side wall 22 , and the outer wall surface of the first side wall 21 and the inner wall surface of the welding cavity 11 can enclose an annular extension channel 26 .

[0125] In some embodiments, the extended channel 26 can be understood as a portion of the dust removal channel 25 extending inward before welding. At this time, the air inlet at the lower end of the dust removal channel 25 is closer to the welding position, so that the welding slag and dust in the welding chamber 11 can more easily enter the dust removal channel 25, thereby improving the dust removal efficiency and effect.

[0126] In some examples, optionally, the inner wall surface of the welding cavity 11 is smoothly connected to the inner wall surface of the second side wall 22 .

[0127] Smooth connection means that there is no gap or protrusion between the inner wall surface of the welding cavity 11 and the inner wall surface of the second side wall 22, so that the two can be continuously connected.

[0128] The inner wall surface of the welding chamber 11 is smoothly connected to the inner wall surface of the second side wall 22, so that the extended channel 26 has better smoothness, which facilitates the airflow and welding slag in the extended channel 26 to enter the dust removal channel 25 of this embodiment.

[0129] Combined with Figure 5 As shown, in some examples, optionally, the second side wall 22 is provided with a connecting port 221 , one end of the exhaust pipe 23 is sealed and connected to the second side wall 22 at the connecting port 221 , and is connected to the dust removal channel 25 through the connecting port 221 .

[0130] The size of the communication port 221 matches the size of the lower end of the exhaust pipe 23. The exhaust pipe 23 can be sealed and connected to the second side wall 22 at the communication port 221 by welding or the like, and the exhaust pipe 23 is connected to the dust removal channel 25 through the communication port 221.

[0131] In this embodiment, the connecting port 221 is provided to seal the exhaust pipe 23 , thereby achieving installation of the exhaust pipe 23 and connection between the exhaust pipe 23 and the dust removal passage 25 .

[0132] Combined with Figure 1 and attached Figure 3 As shown, in some examples, optionally, the dust cover 20 further includes a top wall 27 , and an end of the second side wall 22 facing away from the base 10 and an end of the first side wall 21 facing away from the base 10 are connected to each other through the top wall 27 .

[0133] The top wall 27 can be an annular plate structure. The top wall 27 can be located in the interval between the tops of the first side wall 21 and the second side wall 22, and can be sealed and connected to the second side wall 22 and the first side wall 21 respectively by welding or the like to achieve sealing of the dust removal channel 25 away from the side of the base 10.

[0134] Of course, in addition to being realized by the top wall 27, the side of the dust removal passage 25 facing away from the base 10 can also be achieved by directly sealing and connecting the top of the first side wall 21 and the top of the second side wall 22 (this embodiment is not shown in the figure).

[0135] Finally, please see the attached Figure 1-7As shown, an embodiment of the present application provides a welding device 100, including a base 10 and a dust cover 20, the base 10 is provided with a welding chamber 11, and the welding chamber 11 is provided with a first opening 1131; the dust cover 20 is installed on the base 10, and includes a first side wall 21, a second side wall 22 and an exhaust duct 23, the first side wall 21 encloses a welding channel 24, the second side wall 22 is arranged around the first side wall 21 and encloses a dust removal channel 25 with the first side wall 21, the dust removal channel 25 is closed on the side away from the base 10, and the side of the dust removal channel 25 facing the base 10 is communicated with the first opening 1131, the exhaust duct 23 is connected to the second side wall 22, and is communicated with the dust removal channel 25, and the part of the dust removal channel 25 between the exhaust duct 23 and the base 10 includes an inlet section 252 and a necking section 251 arranged in sequence along a direction away from the first opening 1131, and the flow cross-sectional area of ​​the necking section 251 is smaller than the flow cross-sectional area of ​​the inlet section 252. The first side wall 21 and / or the second side wall 22 are provided with a protruding structure 2511, and the protruding structure 2511 is used to surround the shrinkage section 251. The protruding structure 2511 includes an annular protrusion 25111 arranged along the circumference of the dust removal channel 25. There are multiple annular protrusions 25111, and the multiple annular protrusions 25111 are arranged in sequence in a stepped shape along the direction from the dust removal cover 20 to the base 10. The base 10 is provided with a protective gas channel 12 connected to the welding chamber 11, and the protective gas channel 12 is used to pass the protective gas into the welding chamber 11. The side wall of the welding chamber 11 is provided with a flow balancing structure 1111, and the flow balancing structure 1111 is used to improve the uniformity of the protective gas content in the welding chamber 11. The flow balancing structure 1111 includes a plurality of guide plates 11111, and the plurality of guide plates 11111 are arranged at intervals along the circumference of the welding chamber 11. Along the arrangement direction from the base 10 to the dust cover 20, the welding chamber 11 includes an inlet section 111, an intermediate section 112 and an outlet section 113. The inlet section 111 is directly connected to the protective gas channel 12. The guide plate 11111 is arranged at the inlet section 111. The radial dimension of the inlet section 111 gradually increases along the direction close to the dust cover 20. The length direction of the exhaust pipe 23 forms an acute angle with the arrangement direction from the base 10 to the dust cover 20. The length direction of the exhaust pipe 23 forms an acute angle of 30° to 60° with the arrangement direction from the base 10 to the dust cover 20. One end of the first side wall 21 close to the base 10 extends into the welding chamber 11 through the first opening 1131. The side wall of the welding chamber 11 and the part of the first side wall 21 located in the welding chamber 11 enclose an extension channel 26, and the extension channel 26 is respectively connected to the dust removal channel 25 and the welding chamber 11. The inner wall surface of the welding chamber 11 is smoothly connected to the inner wall surface of the second side wall 22. The second side wall 22 is provided with a communication port 221, and one end of the exhaust pipe 23 is sealed and connected to the second side wall 22 at the communication port 221, and is connected to the dust removal passage 25 through the communication port 221. The dust removal cover 20 also includes a top wall 27, and an end of the second side wall 22 facing away from the base 10 and an end of the first side wall 21 facing away from the base 10 are connected to each other through the top wall 27.

[0136] Based on the above-mentioned welding device 100, an embodiment of the present application provides a battery production system, including a welding device 100 as any one of the above-mentioned technical solutions.

[0137] In some embodiments, the battery production system of this embodiment may also include a battery assembly device and a battery injection device, wherein the battery assembly device is used to load the wound electrode assembly into the battery shell, and the battery injection device is used to inject electrolyte into the battery shell.

[0138] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or the intermediate technical features can be replaced by equivalent ones. However, these modifications or replacements 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 the present application.

Claims

1. A welding device, characterized in that: include: A base is provided with a welding cavity, wherein the welding cavity is provided with a first opening; A dust removal hood is installed on the base and includes a first side wall, a second side wall and an exhaust duct, the first side wall encloses a welding channel, the second side wall is arranged around the first side wall and encloses a dust removal channel with the first side wall, the dust removal channel is closed on the side away from the base, and the dust removal channel is communicated with the first opening on the side facing the base, one end of the exhaust duct is connected to the second side wall and is communicated with the dust removal channel, and the part of the dust removal channel between the exhaust duct and the base includes an inlet section and a reduction section arranged in sequence along a direction away from the first opening, and the flow cross-sectional area of ​​the reduction section is smaller than the flow cross-sectional area of ​​the inlet section.

2. The welding device according to claim 1, characterized in that: The first side wall and / or the second side wall is provided with a protruding structure, and the protruding structure is used to surround the necking section.

3. The welding device according to claim 2, characterized in that: The protruding structure includes an annular protrusion arranged along the circumference of the dust removal channel.

4. The welding device according to claim 3, characterized in that: There are multiple annular protrusions, and the multiple annular protrusions are arranged in sequence in a step-like manner along the direction from the dust cover to the base.

5. The welding device according to claim 1, characterized in that: The base is provided with a shielding gas channel connected to the welding cavity, the shielding gas channel is used to introduce shielding gas into the welding cavity, and the side wall of the welding cavity is provided with a flow balancing structure, the flow balancing structure is used to improve the uniformity of the shielding gas content in the welding cavity.

6. The welding device according to claim 5, characterized in that: The flow balancing structure includes a plurality of guide plates, and the plurality of guide plates are arranged at intervals along the circumference of the welding cavity.

7. The welding device according to claim 6, characterized in that: Along the arrangement direction from the base to the dust hood, the welding chamber includes an entrance section, a middle section and an exit section. The entrance section is directly connected to the protective gas channel. The guide plate is arranged at the entrance section. Along the direction approaching the dust hood, the radial size of the entrance section gradually increases.

8. The welding device according to any one of claims 1 to 7, characterized in that: The length direction of the exhaust pipe is arranged at an acute angle to the arrangement direction from the base to the dust cover.

9. The welding device according to claim 8, characterized in that: The length direction of the exhaust pipe forms an acute angle of 30° to 60° with the arrangement direction from the base to the dust cover.

10. The welding device according to any one of claims 1 to 7, characterized in that: One end of the first side wall close to the base extends into the welding cavity through the first opening, and the side wall of the welding cavity and the part of the first side wall located in the welding cavity enclose an extended channel, and the extended channel is respectively connected to the dust removal channel and the welding cavity.

11. The welding device according to claim 10, characterized in that: The inner wall surface of the welding cavity is smoothly connected to the inner wall surface of the second side wall.

12. The welding device according to any one of claims 1 to 7, characterized in that: The second side wall is provided with a communication opening, and one end of the exhaust pipe is sealed and connected to the second side wall at the communication opening, and is connected to the dust removal passage through the communication opening.

13. The welding device according to any one of claims 1 to 7, characterized in that: The dust cover further includes a top wall, and an end of the second side wall facing away from the base and an end of the first side wall facing away from the base are connected to each other through the top wall.

14. A battery production system, characterized in that: Comprising a welding device as described in any one of claims 1-13.

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