Welding protection device and welding equipment

Abstract

The utility model relates to a welding protection device and welding equipment, and the welding protection device comprises a protection cover main body which is provided with a welding channel, a gas inlet channel and a gas outlet channel; the flow guide cover is arranged in a hollow penetrating mode, one end of the flow guide cover is arranged on the inner side wall of the welding channel in a sealed mode, the other end of the flow guide cover is located in the welding channel, a height difference exists between the other end of the flow guide cover and the bottom end of the welding channel, and an interlayer cavity is formed between the flow guide cover and the inner side wall of the welding channel; the interlayer cavity comprises a first cavity body connected with the air inlet channel and a second cavity body communicated with the first cavity body, and the air outlet channel is communicated with the first cavity body and the second cavity body through a welding channel. The protective gas is divided into the second cavity through the first cavity, the protective gas blown out of the second cavity guarantees oxygen isolation of the welding area, meanwhile, the protective gas and the protective gas blown out of the first cavity form confluence, and the dust removal effect is enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery manufacturing, in particular to a welding protection device and welding equipment. BACKGROUND

[0002] In the battery production process, a large number of processes need to use welding technology. For some welding scenes, the welding process will produce high temperature, which will cause the reaction between the to-be-welded part and the oxygen in the air. Therefore, it is necessary to introduce protective gas into the welding area to effectively isolate the oxygen in the air. On the other hand, due to the splashing of the welding process, dust and debris, effective dust removal measures need to be taken.

[0003] The existing welding protection device cannot meet the requirements of effectively isolating oxygen and dust removal in some high-demand welding scenes, so a new welding protection device needs to be designed. SUMMARY

[0004] The present application provides a welding protection device and welding equipment, which can effectively isolate the oxygen in the welding area and have good dust removal effect, thereby improving the production quality of the battery.

[0005] In a first aspect, the present application provides a welding protection device, comprising:

[0006] A protection cover body is provided with a welding channel, an air inlet channel and an air outlet channel;

[0007] A hollow through-flowing cover is provided, one end of the through-flowing cover is sealingly arranged on the inner side wall of the welding channel, and the other end of the through-flowing cover is located in the welding channel and has a height difference with the bottom end of the welding channel. A sandwich chamber is formed between the through-flowing cover and the inner side wall of the welding channel.

[0008] The sandwich chamber includes a first chamber connected with the air inlet channel, and a second chamber connected with the first chamber. The air outlet channel is connected with the first chamber and the second chamber through the welding channel.

[0009] In combination with the first aspect, in an implementation manner, the inner contour size of the sandwich chamber gradually decreases along the direction in which the through-flowing cover is hollow through and close to the direction of the bottom end of the welding channel.

[0010] In combination with the first aspect, in an implementation manner, the inner contour size of the air inlet channel gradually decreases along the path direction of the air inlet channel and close to the direction of the sandwich chamber.

[0011] In combination with the first aspect, in an implementation manner, the through-flowing cover comprises:

[0012] The four-prism table is hollow through the two end faces, and the end with a larger bottom area is sealed to the inner side wall of the welding channel, and the end with a smaller bottom area is located in the welding channel.

[0013] The welding channel has four inner side walls, wherein the inner side wall adjacent to the gas inlet channel forms a first chamber with the side wall of the four-prism table, and the inner side wall adjacent to the gas inlet channel forms a second chamber with the side wall of the four-prism table.

[0014] In combination with the first aspect, in an embodiment, the bottom end of the side wall of the four-prism table located on the side of the first chamber is lower than the bottom end of the side wall located on the side of the second chamber.

[0015] In combination with the first aspect, in an embodiment, the top end of a side wall of the four-prism table extends a first side plate, and the first side plate is connected to the inner side wall of the welding channel.

[0016] The top wall of another side wall of the four-prism table extends a second side plate, and the second side plate is embedded and installed in the mounting hole of the inner side wall of the welding channel.

[0017] In combination with the first aspect, in an embodiment, the protective cover body and the flow guide cover are a set of flow guide protective cover assemblies, the number of the flow guide protective cover assemblies is two, the two flow guide protective cover assemblies are connected, and the spacing direction of the two flow guide protective cover assemblies is consistent with the spacing direction between the positive and negative electrodes of the battery cell.

[0018] The second aspect provides a welding device, which includes the welding protection device as described in some embodiments above.

[0019] In combination with the second aspect, in an embodiment, the welding device includes:

[0020] The receiving plate is provided with a telescopic assembly, the telescopic assembly is provided with two telescopic ends with opposite telescopic directions, and the telescopic ends are fixed with dust suction pipes, the two telescopic ends can clasp and fix the opposite sides of the protective cover body when they are close to each other, and the dust suction pipes are in communication with the gas outlet channel.

[0021] In combination with the second aspect, in an embodiment, the welding device further includes:

[0022] The protective gas joint is in communication with the gas inlet channel.

[0023] The welding device further includes a welding device arranged above the welding channel.

[0024] The technical scheme provided by the embodiments of the present application has the following beneficial effects:

[0025] The bottom end surface of the welding channel is used to physically isolate the welding point and form a welding area, thereby reducing the interference of external air flow on the welding area. The outlet channel is connected to the first chamber and the second chamber through the welding channel. The protective gas enters the first chamber through the inlet channel and is then divided into the second chamber. When the outlet channel sucks the protective gas blown from the first chamber to the welding area under the action of negative pressure, the protective gas blown from the second chamber can be supplied to the welding area in time, so as to ensure the effective isolation of the welding area from oxygen in the air. At the same time, the protective gas blown from the second chamber does not affect the dust removal effect of the outlet channel on the welding area under the action of negative pressure, and at the same time, the protective gas blown from the first chamber and the protective gas blown from the second chamber form a confluence, so that the high-temperature welding slag generated in the welding area is quickly sucked away by the outlet channel, thereby improving the welding quality. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of the welding protection device.

[0028] Figure 2 It is a schematic diagram of the cross-sectional structure of the welding protection device.

[0029] Figure 3 It is a schematic diagram of the three-dimensional structure of the flow guide cover.

[0030] Figure 4 It is a schematic diagram of the distribution of two flow guide covers in the welding protection device.

[0031] Figure 5 It is a schematic diagram of the three-dimensional structure of the welding equipment.

[0032] Figure 6 It is Figure 5 It is a schematic diagram of the three-dimensional structure of the welding equipment without the receiving plate.

[0033] In the figure: 1, protective cover main body; 11, welding channel; 12, inlet channel; 13, outlet channel; 2, flow guide cover; 21, quadrangular frustum; 22, first side plate; 23, second side plate; 3, interlayer chamber; 4, telescopic assembly; 41, action execution cylinder; 5, dust suction pipe; 6, protective gas connector; 7, welding device; 8, battery cell; 9, receiving plate. DETAILED DESCRIPTION

[0034] In the following, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application, so that those skilled in the art can better understand the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0035] The battery mentioned in the embodiments of the present application includes one or more battery monomers to provide a single battery module with higher voltage and capacity. For example, the battery mentioned in the present application can include a battery module or a battery pack, etc.

[0036] The welding mentioned in the embodiments of the present application includes various welding types, mainly the welding types that will cause the battery components to be welded to react with oxygen due to high temperature and heat generated during the welding process, such as laser welding. The present application does not make specific limitations on the above welding types.

[0037] In the battery production process, welding technology is widely used. For some welding scenarios, the high temperature generated by welding will cause the battery components to be welded to react with oxygen in the air, thereby affecting the welding quality. Therefore, protective gas is often introduced into the welding area during the welding process. The protective gas is generally inert gas, such as nitrogen, argon, helium, etc. In the battery welding process, slag, dust and debris will also be generated. For some welding scenarios with high welding requirements, the existing welding protection device can meet the dust removal requirements, but the protective gas in the welding area will also be sucked away, resulting in low protective gas concentration in the welding area, which cannot effectively isolate oxygen, thereby affecting the welding quality.

[0038] To solve the above problems, the embodiments of the present application provide a welding protection device and a welding equipment, which can ensure that the protective gas blown into the welding area by the gas inlet channel can sufficiently cover the welding area, effectively isolate oxygen in the air, and at the same time, ensure that the gas outlet channel can effectively remove high-temperature slag, dust and debris under the action of negative pressure.

[0039] In a first aspect, as Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the embodiment of the present application provides a welding protection device, which comprises: a protection cover body 1, the protection cover body 1 is provided with a welding channel 11, an air inlet channel 12 and an air outlet channel 13; a hollow through-flowing cover 2, one end of the through-flowing cover 2 is sealingly arranged on the inner side wall of the welding channel 11, and the other end is located in the welding channel 11 and has a height difference with the bottom end of the welding channel 11, and a sandwich cavity 3 is formed between the through-flowing cover 2 and the inner side wall of the welding channel 11; the sandwich cavity 3 comprises a first cavity connected with the air inlet channel 12, and a second cavity connected with the first cavity, and the air outlet channel 13 is connected with the first cavity and the second cavity through the welding channel 11.

[0040] For example, it should be understood that, Figure 1 It is a perspective view of the protection cover body 1, and the left side of the welding channel 11 is not installed with the through-flowing cover 2, and the left side shows the protection gas flow path, and the right side of the welding channel 11 is installed with the through-flowing cover 2. Figure 2 It is a cross-sectional view of the protection cover body 1, and the left side of the welding channel 11 is not installed with the through-flowing cover 2, and the right side of the welding channel 11 is installed with the through-flowing cover 2. Figure 4 It is a distribution diagram of two through-flowing covers 2 installed in the corresponding welding channels 11. The protection cover body 1 is provided with the welding channel 11 from top to bottom, and the bottom end face of the welding channel 11 is used to fit the battery component to be welded, so as to prevent the gas and splashes generated during welding from causing damage to the battery cell 8, that is, the welding area is formed at the inside of the bottom end of the welding channel 11.

[0041] Specifically, the welding point is physically isolated by the bottom end face of the welding channel 11 and a welding area is formed, so as to reduce the interference of external air flow on the welding area. The air outlet channel 13 is connected with the first cavity and the second cavity through the welding channel 11, the protection gas enters the first cavity through the air inlet channel 12 and is then shunted to the second cavity, after the protection gas blown from the first cavity to the welding area is sucked away by the air outlet channel 13 under the action of negative pressure, the protection gas blown from the second cavity can be timely supplemented to the welding area, so as to ensure the effective isolation of oxygen in the air from the welding area, at the same time, the protection gas blown from the second cavity does not affect the dust removal effect of the air outlet channel 13 on the welding area under the action of negative pressure, and at the same time, the protection gas blown from the second cavity can form confluence with the protection gas blown from the first cavity, so that the high-temperature welding slag generated in the welding area is quickly sucked away by the air outlet channel 13, thereby improving the welding quality.

[0042] In combination with the first aspect, in one embodiment, as Figure 2 As shown, the inner contour size of the sandwich cavity 3 gradually decreases along the direction of the hollow through-flowing cover 2 and the direction close to the bottom end of the welding channel 11.

[0043] In this embodiment, specific reference is made to Figure 2From top to bottom, as the inner profile size of the interlayer chamber 3 gradually decreases, the incoming protective gas is subjected to a gradually narrowing space restriction during its flow, causing the gas to flow more concentratedly towards the welding area. This focusing effect helps to form a more dense and stable gas protection layer around the welding point, further reducing air contact with the welding pool and improving welding quality. The gradually decreasing inner profile of the interlayer chamber 3 can guide the gas to flow in a more stable and orderly manner, reducing turbulence and vortex generation. This helps to maintain the stability and uniformity of the welding area gas, avoiding welding defects caused by unstable gas flow. By optimizing the gas flow path and focusing effect, this design can more effectively utilize protective gas, reducing gas waste. At the same time, a stable welding environment and improved welding quality can indirectly improve welding efficiency by reducing the need for rework and repair.

[0044] In combination with the first aspect, in an embodiment, as shown in Figure 2 , the inner profile size of the gas inlet channel 12 gradually decreases along its path direction and towards the direction of the interlayer chamber 3.

[0045] In this embodiment, the gradual decrease in the inner profile size of the gas inlet channel 12 causes the gas within the channel to be subjected to an increasing pressure during its flow. This pressure gradient accelerates the flow speed of the gas, allowing the protective gas to enter the interlayer chamber 3 more quickly and concentrate on the welding area in a timely manner. The gradually decreasing inner profile size not only accelerates the gas flow, but also causes the gas to be more focused when entering the interlayer chamber 3. This focusing effect helps to form a more dense and uniform gas protection layer around the welding point, improving the protection effect. By optimizing the shape of the gas inlet channel 12, this design can more effectively utilize protective gas. Accelerated and focused gas flow reduces gas dispersion and waste, improving gas utilization efficiency. Stable, fast and focused gas flow helps to maintain the stability of the welding area. This reduces the interference of external factors on the welding process, improving the precision and quality of the welding.

[0046] In combination with the first aspect, in an embodiment, as shown in Figure 1 , Figure 2 and Figure 3 , the flow guide cover 2 includes: a quadrangular pyramid 21, both end faces of the quadrangular pyramid 21 are hollowly and throughly arranged, and the quadrangular pyramid 21 is sealedly arranged at the inner side wall of the welding channel 11 at the end with a larger bottom area, and the end with a smaller bottom area is located in the welding channel 11; the welding channel 11 has four inner side walls, wherein the inner side wall adjacent to the gas inlet channel 12 and the side wall of the quadrangular pyramid 21 form a first chamber, and the inner side wall adjacent to the gas inlet channel 12 and the side wall of the quadrangular pyramid 21 form a second chamber.

[0047] In this embodiment, with specific reference toFigure 3 The shroud 2 comprises a quadrangular prism 21, and the upper and lower end faces of the quadrangular prism 21 are provided in a penetrating and communicating manner. Details are shown in Figure 1 The four side walls of the quadrangular prism 21 correspond to the four inner side walls of the lower half of the welding channel 11 one by one, so that a sandwich chamber 3 composed of a first chamber and a second chamber is formed between the quadrangular prism 21 and the welding channel 11, that is, the protective gas enters the first chamber from the gas inlet channel 12, is shunted from the first chamber to the second chamber, and finally flows together in the welding area, and finally the protective gas and the welding slag are sucked away together by the gas outlet channel 13 under the action of negative pressure.

[0048] In combination with the first aspect, in an embodiment, as shown in Figure 4 The bottom end of the side wall of the quadrangular prism 21 on the first chamber side is lower than the bottom end of the side wall on the second chamber side. For example, as shown in Figure 4 The bottom end of the side wall of the quadrangular prism 21 on the first chamber side is lower than the length X (1mm≤X≤5mm) of the bottom end of the side wall of the quadrangular prism 21 on the second chamber side. The actual value of X can be changed according to the actual use of the product.

[0049] In this embodiment, the lower bottom end of the side wall on the first chamber side allows the protective gas to be more smoothly concentrated and injected into the welding area when introduced, reducing the resistance of gas flow and helping to form a stable gas protection layer. The lower bottom end of the side wall helps the gas to diffuse in the sandwich chamber 3, reduces the phenomenon of gas accumulation and vortex, and improves the protection effect. By optimizing the introduction and distribution of the gas, this design can more effectively prevent the influence of impurities such as spatters and oxides generated during the welding process on the welding area, reduce the generation of welding defects, and improve the welding quality.

[0050] In combination with the first aspect, in an embodiment, as shown in Figure 2 and Figure 3 One side wall of the quadrangular prism 21 extends a first side plate 22, and the first side plate 22 is connected to the inner side wall of the welding channel 11.

[0051] The other side wall of the quadrangular prism 21 extends a second side plate 23, and the second side plate 23 is embedded and installed in the mounting hole of the inner side wall of the welding channel 11.

[0052] In this embodiment, the quadrangular prism 21 has two side walls whose top ends extend the first side plate 22 and the second side plate 23. The first side plate 22 is connected to one side wall of the upper part of the welding channel 11 to ensure tight connection. The second side plate 23 is embedded and installed in the mounting hole of the other side wall of the upper part of the welding channel 11 to provide stable support.

[0053] In combination with the first aspect, in an embodiment, as shown in Figure 2As shown, the protective cover body 1 includes an upper plate and a lower plate, which are fixedly connected in the vertical direction. The second side plate 23 is embedded in the mounting hole formed between the upper plate and the lower plate, further improving the stable installation of the flow guide 2.

[0054] In conjunction with the first aspect, in one embodiment, the surface of the flow deflector 2 is provided with a fire-resistant smooth layer. Exemplarily, the fire-resistant smooth layer may comprise a ceramic-coated material or a Teflon-coated material.

[0055] In conjunction with the first aspect, in one implementation, such as in a scenario where the battery terminals and top cover are welded, as... Figure 1 , Figure 2 and Figure 6 As shown, the protective cover body 1 and the flow guide shroud 2 form a set of flow guide protective cover assemblies. There are two flow guide protective cover assemblies, which are connected together, and the spacing direction of the two flow guide protective cover assemblies is consistent with the spacing direction of the positive and negative electrodes of the battery cell 8.

[0056] In this embodiment, two such flow-guiding protective cover assemblies are used. These two assemblies are connected, either by snap-fit ​​fixing or integral molding, to form a unified protective structure. Importantly, the spacing direction of these two assemblies is consistent with the spacing direction of the positive and negative electrodes of the battery cell 8. This means that they are arranged according to the spacing direction of the positive and negative electrodes of the battery cell 8 to match the arrangement of the positive and negative electrodes of the battery cell 8. That is, when the protective cover body 1 is placed on the battery cell 8, the positive and negative electrodes of the battery cell 8 are pressed together by the corresponding welding channels 11 in one go, which facilitates subsequent welding work.

[0057] In the above embodiments, with the corresponding structural changes to the flow guide shroud 2 and the welding channel 11, the interlayer chamber 3 can have three, five or more side wall chambers, without specifically limiting the number of side wall chambers of the interlayer chamber 3.

[0058] Secondly, such as Figure 5 and Figure 6 As shown in the figure, this application provides a welding device that includes the welding protection device mentioned above.

[0059] In conjunction with the second aspect, in one implementation method, such as Figure 5 and Figure 6 As shown, the welding equipment includes: a receiving plate 9, the receiving plate 9 is provided with a telescopic component 4, the telescopic component 4 is provided with two telescopic ends with opposite telescopic directions, and the telescopic ends are fixed with a dust suction pipe 5. The two telescopic ends are close to each other and can clamp and fix the opposite sides of the protective cover body 1, and make the dust suction pipe 5 connected to the air outlet channel 13.

[0060] For example, the telescopic assembly 4 includes two active actuators (such as pneumatic cylinders, hydraulic cylinders, or electric push rods), the telescopic directions of the two active actuators are opposite to each other, and both are mounted on the bottom of the receiving plate 9.

[0061] In this embodiment, the receiving plate 9 is the foundation of the device, used to support and secure other components. The telescopic assembly 4, mounted on the receiving plate 9, has two telescopic ends that can extend and retract in opposite directions. The design of the telescopic assembly 4 allows it to be adjusted according to the size and shape of the protective cover body 1 to ensure a secure clamping. Both telescopic ends are fixed with suction pipes 5, meaning that while clamping the protective cover body 1, the suction pipes 5 are also positioned appropriately. The function of the suction pipes 5 is to extract any fumes, dust, or other contaminants that may be generated during welding, maintaining a clean working environment. When the two telescopic ends approach each other, they clamp and secure the opposite sides of the protective cover body 1. This clamping not only ensures the stability of the protective cover body 1 during welding but also connects the suction pipes 5 to the venting channel 13 within the protective cover body 1. Once connected, the suction pipes 5 can more effectively extract contaminants generated during welding, preventing them from entering the battery system or affecting welding quality. By integrating the telescopic assembly 4 and the suction pipes 5, the device not only improves the stability of the welding process but also significantly reduces post-weld cleaning work.

[0062] In conjunction with the second aspect, in one implementation method, such as Figure 5 and Figure 6 As shown, the welding equipment also includes: a shielding gas connector 6, which is connected to the gas inlet channel 12; and a welder 7, which is positioned above the welding channel 11.

[0063] In this embodiment, the protective gas connector 6 is an important component of the welding equipment, and its function is to connect with the gas inlet channel 12. During the welding process, protective gas (such as argon, nitrogen, etc.) is introduced into the welding area through the protective gas connector 6 and the gas inlet channel 12 to isolate the welding area from air, prevent oxidation of the welded part, and thus improve the welding quality and strength. The welder 7 is another key component of the welding device, and it is positioned above the welding channel 11. The welding channel 11 is an opening on the protective cover body 1, which allows the welder 7 to weld the battery component to be welded through the welding channel 11.

[0064] The welding device can be a laser welder, an ultrasonic welder, a flame welder, etc., and this application does not limit the type of welding device. Taking a laser welder as an example, the laser emitted by the laser welder can be applied to the battery component to be welded through the welding channel 11 of the protective cover body 1.

[0065] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0066] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0067] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A welding protection device, characterized in that, It includes: The protective cover body (1) has a welding channel (11), an air inlet channel (12) and an air outlet channel (13); A hollow, through-hole flow guide (2) is provided. One end of the flow guide (2) is sealed on the inner wall of the welding channel (11), and the other end is located inside the welding channel (11) and has a height difference with the bottom end of the welding channel (11). A sandwich chamber (3) is formed between the flow guide (2) and the inner wall of the welding channel (11). The interlayer chamber (3) includes a first chamber connected to the air inlet channel (12) and a second chamber connected to the first chamber. The air outlet channel (13) is connected to the first chamber and the second chamber through a welding channel (11).

2. The welding protection device as described in claim 1, characterized in that, Along the direction through which the flow guide (2) penetrates and near the bottom of the welding channel (11), the inner contour size of the sandwich chamber (3) gradually decreases.

3. The welding protection device as described in claim 1, characterized in that, Along the path of the air inlet channel (12) and in the direction close to the interlayer chamber (3), the inner contour size of the air inlet channel (12) gradually decreases.

4. The welding protection device as described in claim 1, characterized in that, The flow deflector (2) includes: A quadrangular frustum (21) has two hollow, through-hole ends. The end of the quadrangular frustum (21) with a larger bottom area is sealed on the inner wall of the welding channel (11), while the end with a smaller bottom area is located inside the welding channel (11). The welding channel (11) has four inner sidewalls, wherein the inner sidewall near the air inlet channel (12) forms a first chamber between the sidewall of the quadrangular truncated pyramid (21), and the inner sidewall adjacent to the air inlet channel (12) forms a second chamber between the sidewall of the quadrangular truncated pyramid (21).

5. The welding protection device as described in claim 4, characterized in that, The bottom end of the side wall of the quadrangular frustum (21) located on the first chamber side is lower than the bottom end of the side wall located on the second chamber side.

6. The welding protection device as described in claim 4, characterized in that, A first side plate (22) extends from the top of one side wall of the truncated pyramid (21), and the first side plate (22) fits and connects to the inner side wall of the welding channel (11); The top wall of the other side wall of the quadrangular frustum (21) extends into a second side plate (23), which is embedded in the mounting hole of the inner side wall of the welding channel (11).

7. The welding protection device as described in claim 1, characterized in that, The protective cover body (1) and the flow guide (2) are a set of flow guide protective cover assemblies. There are two flow guide protective cover assemblies. The two flow guide protective cover assemblies are connected, and the spacing direction of the two flow guide protective cover assemblies is consistent with the spacing direction of the positive and negative electrodes of the battery cell.

8. A welding device, characterized in that, It includes the welding protection device as described in any one of claims 1-7.

9. The welding equipment as described in claim 8, characterized in that, The welding equipment includes: The receiving plate (9) is provided with a telescopic component (4). The telescopic component (4) is provided with two telescopic ends with opposite telescopic directions, and the telescopic ends are fixed with a suction pipe (5). The two telescopic ends are close to each other and can clamp and fix the opposite sides of the protective cover body (1), and make the suction pipe (5) connected to the air outlet channel (13).

10. The welding equipment as described in claim 8, characterized in that, The welding equipment also includes: A protective gas connector (6) is connected to the air inlet channel (12); Welding device (7) is disposed above the welding channel (11).

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