Battery cell module welding and pressing mechanism and welding device

Abstract

The utility model discloses a battery cell module welding hold-down mechanism and welding device, including: base frame, hold-down structure and dust removal structure, hold-down structure includes hold-down support plate and hold-down piece group, hold-down support plate is provided on the side of base frame far away from lifting structure, the number of hold-down piece group is several, several hold-down piece group evenly distributed on hold-down support plate; the box body covers the top end of the pressing supporting plate and is used for preventing impurities generated in the welding process from splashing outwards. The fixed end of the dust removal assembly is connected with the base frame, and the suction end of the dust removal assembly communicates with the box body and / or the pressing piece set so as to suck impurities generated in the welding process. According to the structure, impurities generated in the welding process are prevented from splashing outwards by arranging the box body, it is guaranteed that a laser welding area is relatively closed, and welding slag and other impurities are blocked in an inner cavity of the box body. Pollutants and impurities generated by welding such as welding slag and slag steam in the box body are sucked away in time through the dust suction assembly, pollution to the surrounding environment is reduced, and the situation that the welding quality is affected by the pollutants is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery module production equipment, in particular to a battery core module welding and pressing mechanism and a welding device. Background Art

[0002] Currently, a multi-point laser welding process is used between battery cells. The laser welding equipment required to complete this process has high requirements. Not only does it need to meet the requirements of multi-point laser welding, but in order to meet the production line capacity requirements, multiple battery cells need to be compressed simultaneously in a limited space. As a result, the compression tooling corresponding to a single battery cell occupies a small space and the positive and negative poles must be insulated within the limited space. In addition, cold solder joints and weld-through are not allowed during welding.

[0003] Currently, all areas to be welded of the cell module are usually compressed by a clamping tool, and then the cell module is welded using a pulsed laser. In addition, the clamping tool or the laser has no perfect dust removal considerations, which makes the welding surface prone to oxidation. In addition, the smoke and spatter generated during the welding process can easily contaminate the cell and cause attenuation of the laser energy, resulting in problems such as cold welding, and the welding quality cannot be guaranteed. Utility Model Content

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the current practice of usually pressing all the areas to be welded of the battery cell module by a pressing tool, and then using a pulse laser to weld the battery cell module, and the pressing tool or the laser has no perfect dust removal considerations, which makes the welding surface prone to oxidation, and the smoke and spatter generated during the welding process easily contaminate the battery cell and cause attenuation of the laser energy, resulting in cold welding and other problems, and the welding quality defects cannot be guaranteed.

[0005] To this end, the present invention provides a battery cell module welding and pressing mechanism, comprising:

[0006] A base frame, one side of the base frame is connected to the lifting structure, and the lifting structure is used to drive the base frame to rise and fall;

[0007] The compression structure includes a compression support plate and a compression member group. The compression support plate is arranged on the side of the base frame away from the lifting structure. There are several compression member groups, and the several compression member groups are evenly distributed on the compression support plate.

[0008] The dust removal structure includes a box body and a dust removal assembly. The box body cover is arranged at the top of the compression support plate. The box body is used to prevent impurities generated during welding from splashing out. The fixed end of the dust removal assembly is connected to the base frame, and the suction end of the dust removal assembly is connected to the box body and / or the compression member group to absorb impurities generated during welding.

[0009] When the material needs to be welded, the lifting structure drives the pressing structure to approach the material and press the area to be welded, and also presses the adjacent areas to be welded and welded. Subsequently, the external laser welding device welds the intersection of the welded battery pole and the busbar. During the welding process, impurities such as welding slag are generated. By setting up a box to prevent the impurities generated during welding from splashing out, the laser welding area is relatively closed, and impurities such as welding slag are blocked in its inner cavity. The dust collection component is used to promptly remove pollutants and impurities generated by welding, such as welding slag and slag vapor, in the box to reduce pollution to the surrounding environment and prevent pollutants from affecting the welding quality.

[0010] Optionally, the above-mentioned pressing member group includes: a first pressing member and a second pressing member distributed on the side of the first pressing member, and there are several first pressing members and second pressing members. The first pressing member is used to press the area to be welded, and the second pressing member is used to press the unwelded area and / or welded area adjacent to the area to be welded.

[0011] The unwelded area and / or welded area adjacent to the area to be welded are compressed by the second pressing member to avoid one end of the busbar from being lifted during welding, thereby improving the welding quality of the tab.

[0012] Optionally, a first through hole is opened on the above-mentioned pressing support plate corresponding to the first pressing member, and a second through hole is opened on the box body corresponding to the first through hole; the external welding device is configured to emit laser through the first through hole and the second through hole to weld the material pressed by the first pressing member.

[0013] The design of the first through hole and the second through hole improves the sealing performance of the box as much as possible without affecting the laser welding, thereby preventing welding slag generated during welding from splashing out.

[0014] Optionally, the above-mentioned pressing support plate is further provided with a height measuring through hole corresponding to the area to be welded;

[0015] The battery cell module welding and clamping mechanism also includes a height measuring structure, which is configured to measure the height of the area to be welded through the height measuring through hole.

[0016] By cooperating with the height measuring structure and the height measuring through hole, the height of the welding position can be detected before welding, so as to adjust the height or power of the laser and improve the welding quality of laser welding.

[0017] Optionally, the height measuring structure includes a driving member and at least one height measuring sensor; the fixed end of the driving member is installed at the first position on the pressing support plate, and the output end of the driving member is installed with at least one height measuring sensor;

[0018] The height measuring sensor has a measuring state in which it is driven by the driving member to move to the height measuring through hole position to measure the material height and a standby state in which it is moved away from the height measuring through hole to the first position.

[0019] The height measuring sensor is driven to move by the driving component, which can not only control the height measuring sensor to achieve height measurement, but also prevent the height measuring sensor from blocking the path of the welding laser.

[0020] Optionally, the first pressing member and the second pressing member are both movably mounted on the pressing support plate via an elastic component;

[0021] The elastic component includes a guide member and an elastic member. One end of the guide member is installed on the first pressing member or the second pressing member, and the other end of the guide member is installed on the pressing support plate. The elastic member is sleeved on the guide member, and one end of the elastic member abuts the first pressing member or the second pressing member, and the other end abuts the pressing support plate.

[0022] The design of the elastic component can prevent the first pressing member and the second pressing member from making hard contact with the object to be welded, and can ensure that each pressing position is firmly pressed.

[0023] Optionally, the above-mentioned battery module welding and pressing mechanism further includes a gas input component and an air intake monitoring component, and the fixed end of the gas input component is connected to the pressing support plate;

[0024] An annular cavity is formed around the inner cavity of the first pressing member at one end close to the material, and a gas inlet is formed on one side of the first pressing member. The gas inlet is connected to the annular cavity, and an end of the gas inlet away from the annular cavity is connected to the output end of the gas inlet member; the gas inlet and the annular cavity form a gas delivery channel;

[0025] The gas input member is configured to deliver an inert gas to the area to be welded through the gas delivery channel;

[0026] The gas intake monitoring component is in communication with the gas input component and is used for monitoring the intake gas flow rate in the gas input component during the process of the gas input component conveying the inert gas.

[0027] The design of the annular cavity enables the inert gas to reach the surface of the object to be welded more evenly; the gas intake monitoring component can monitor the flow of the inert gas in real time, thereby improving the welding quality.

[0028] Optionally, the above-mentioned dust removal component includes a dust suction pipeline, the fixed end of the dust suction pipeline is fixedly connected to the base frame, the first dust suction end of the dust suction pipeline is connected to the clamping member group and is used to absorb impurities generated in the area to be welded during welding, the second dust suction end of the dust suction pipeline is connected to the box body and is used to absorb impurities splashed into the box body during welding, and the output end of the dust suction pipeline is connected to an external air source to discharge the impurities absorbed by the first dust suction end and the second dust suction end.

[0029] Impurities sucked by the first suction end and the second suction end are discharged through the suction pipeline, thereby improving the cleanliness of the welding clamping mechanism and thus improving the welding quality.

[0030] Optionally, the dust removal component further includes a wind speed detection component, a detection end of the wind speed detection component is connected to the output end of the dust suction pipeline and is used to detect the dust suction wind speed in the dust suction pipeline.

[0031] The dust collection wind speed in the dust collection pipeline is detected by the wind speed detection component to ensure the dust collection quality.

[0032] A welding device, comprising a conveying mechanism, a welding mechanism and the above-mentioned battery cell module welding and pressing mechanism;

[0033] The battery module welding clamping mechanism is installed on the conveying mechanism, and the conveying mechanism can move the battery module welding clamping mechanism to the welding area of ​​the battery module to be welded or remove the battery module welding clamping mechanism from the welded material;

[0034] The welding mechanism includes a transfer mechanism and a laser welding head. The laser welding head is installed at the driving end of the transfer mechanism. The transfer mechanism is configured to drive the laser welding head to move horizontally and up and down to perform welding on the area to be welded which is clamped by the welding clamping mechanism of the battery cell module.

[0035] The battery cell module welding and clamping mechanism is transported to the welding position through the conveying mechanism, and then the battery cell module welding and clamping mechanism presses the materials to be welded. Finally, the welding mechanism performs laser welding on the materials to be welded, with a high level of automation and good welding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 This is a schematic diagram of the overall structure of the battery module welding and pressing mechanism provided in the present utility model;

[0038] Figure 2 This is a schematic structural diagram of the compression assembly provided in the present utility model;

[0039] Figure 3 A top view of the compression assembly provided in the present invention;

[0040] Figure 4 This is a schematic structural diagram of the first pressing member provided in the present utility model;

[0041] Figure 5 This is an internal cross-sectional view of the first pressing member provided in the present utility model;

[0042] Figure 6 This is a schematic structural diagram of the welding device provided in the present utility model;

[0043] Figure 7 A top view of the welding device provided in the present invention;

[0044] Figure 8 This is a schematic structural diagram of the positioning structure provided in the present utility model;

[0045] Description of reference numerals:

[0046] 1-base frame; 11-lifting structure;

[0047] 2 - Compression structure; 21 - Compression support plate; 211 - First through hole; 212 - Height measurement through hole; 22 - Compression member assembly; 221 - First compression member; 222 - Annular cavity; 223 - Gas inlet; 224 - Second compression member;

[0048] 3-dust removal structure; 31-box; 311-second through hole; 32-dust removal assembly; 321-dust suction pipe; 322-wind speed detection component;

[0049] 4-height measuring structure; 41-driving element; 42-height measuring sensor;

[0050] 5-Conveying mechanism;

[0051] 6-elastic component; 61-elastic member; 62-guide member;

[0052] 7-welding mechanism; 71-transfer mechanism; 72-laser welding head;

[0053] 8-positioning structure; 81-positioning sensor; 82-positioning pin;

[0054] 9-Gas input. DETAILED DESCRIPTION

[0055] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0056] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0057] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0058] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0059] Example 1

[0060] This embodiment provides a battery module welding and pressing mechanism, such as Figures 1 to 5 As shown, it includes a base frame 1, a pressing structure 2 and a dust removal structure 3. In this embodiment, the materials to be welded can be battery poles and busbars.

[0061] like Figure 1 As shown, the base frame 1 is plate-shaped and placed vertically; the side of the base frame 1 away from the clamping structure 2 is connected to the lifting structure 11. The clamping structure 2 includes a clamping support plate 21 and a clamping member group 22. The clamping support plate 21 is horizontally fixed on the side of the base frame 1 away from the lifting structure 11. There are several clamping member groups 22, and the several clamping member groups 22 are evenly distributed on the clamping support plate 21. The clamping assembly includes a first clamping member 221 and a second clamping member 224. In this embodiment, there are four first clamping members 221, which are fixed in a rectangular array in the middle of the clamping support plate 21. There are also four second clamping members 224, and two second clamping members 224 form a group. The two groups of second clamping members 224 are respectively arranged on both sides of the middle first clamping member 221, forming a clamping structure 2 with second clamping members 224 on both sides and four first clamping members 221 in the middle.

[0062] Two first through holes 211 are defined on the pressing support plate 21 corresponding to the first pressing members 221 . The two first through holes 211 correspond to the four first pressing members 221 , respectively.

[0063] like Figures 1 to 3 As shown, the dust removal structure 3 includes a housing 31 and a dust removal assembly 32. The housing 31 is a hollow structure. The housing 31 covers the top of the compression support plate 21, and can cover the upper surface of the compression support plate 21 in the cavity inside the housing 31. Two second through holes 311 are also formed on the housing 31 corresponding to the first through holes 211.

[0064] When the material needs to be welded, the lifting structure 11 drives the clamping structure 2 close to the material, the first clamping member 221 presses the area to be welded, and the second clamping members 224 on both sides press the adjacent areas to be welded or welded during welding, or the adjacent areas to be welded and welded are compressed. Subsequently, the external laser welding device emits laser light through the second through hole 311 and the first through hole 211 in sequence, and then through the welding through hole in the middle of the first clamping member 221, and irradiates the bottom end of the first clamping member 221, that is, the intersection of the battery pole and the busbar to be welded, for welding. During the welding process, impurities such as welding slag will be generated. The box body 31 is provided to prevent the impurities generated during welding from splashing out, ensure that the laser welding area is relatively closed, and block the welding slag and other impurities in its inner cavity. Furthermore, since the poles and busbars need to be welded together during welding, a busbar may need to be electrically connected to the poles of at least two battery cells simultaneously. Therefore, the nearby areas to be welded need to be compressed during welding to prevent one end of the busbar from being compressed and the other end from tilting up, resulting in poor welding quality at the tilted position. Compared with the existing method of using a single pressure plate to uniformly compress the poles and busbars of all battery cells in the entire battery module, this method can compensate for any errors in the top surface height of the area to be welded in each battery cell, ensuring the welding quality of all welding areas, thereby improving the overall welding quality of the battery cells.

[0065] like Figure 3As shown, the dust removal assembly 32 includes a dust suction line 321, the fixed end of which is fixedly connected to the base frame 1, the first dust suction end of the dust suction line 321 being connected to the pressing member group 22, that is, the first dust suction end of the dust suction line 321 being connected to the welding through-hole in the middle of the first pressing member 221, the second dust suction end of the dust suction line 321 being connected to the housing 31, and the output end of the dust suction line 321 being connected to the external air source. The detection end of the wind speed detection member 322 is arranged at the output end of the dust suction line 321. By setting up the dust removal assembly 32, the external air source is started, the first dust suction end is used to absorb impurities generated during welding in the area to be welded, the second dust suction end is used to absorb impurities splashed into the housing 31 during welding, the output end of the dust suction line 321 discharges the impurities absorbed by the first and second dust suction ends, and the dust suction assembly is used to promptly remove pollutants and impurities generated by welding, such as welding slag and slag vapor, in the housing 31, thereby reducing pollution to the surrounding environment and preventing pollutants from affecting the welding quality. The wind speed detection element 322 is used to detect the dust suction wind speed in the dust suction pipeline 321 to prevent the wind speed from being too fast and affecting the welding, and to prevent the wind speed from being too slow and making it impossible to extract impurities generated during welding.

[0066] In this embodiment, if Figure 4 and Figure 5 As shown, the first pressing member 221 and the second pressing member 224 are both movably mounted on the pressing support plate 21 via an elastic assembly 6. The elastic assembly 6 includes a guide member 62 and an elastic member 61. One end of the guide member 62 is fixed to the first pressing member 221 or the second pressing member 224, and the other end of the guide member 62 is fixed to the pressing support plate 21. The elastic member 61 is sleeved on the guide member 62. One end of the elastic member 61 abuts against the first pressing member 221 or the second pressing member 224, and the other end of the elastic member 61 abuts against the pressing support plate 21. The elastic member 61 is exemplified as a spring sleeved on a guide rod; similar functional members are applicable and are not limited here. The guide member 62 and the elastic member 61 improve the accuracy of the movement of the first pressing member 221 or the second pressing member 224, preventing deviation. The elastic member 61 provides contact cushioning and reset capabilities for the first pressing member 221 and the second pressing member 224, preventing wear between the battery terminal and the busbar during the pressing process, which could affect welding. Furthermore, stable pressing can be achieved even when the area to be welded is at a certain angle.

[0067] In order to further ensure the quality of welding, such as Figure 2As shown, this embodiment is also provided with a height measuring structure 4. A height measuring through hole 212 is opened in the pressing support plate 21 corresponding to the area to be welded. The height measuring structure 4 includes a driving member 41 and at least one height measuring sensor 42. In this embodiment, one driving member 41 is correspondingly provided with one height measuring sensor 42. The fixed end of the driving member 41 is fixed to the top surface of the pressing support plate 21, and the height measuring sensor 42 is fixed to the movable end of the driving member 41. Before the lifting mechanism drives the pressing support plate 21 and the pressing structure 2 downward, height measurement is required. The driving member 41 drives the height measuring sensor 42 to move toward the height measuring through hole 212 until the measuring end of the height measuring sensor 42 and the height measuring through hole 212 are in the same position. The measuring sensor measures the actual height of the pole through the height measuring through hole 212. Based on the detected height data, the upper pressing support plate 21 and the external welding device can be moved to the optimal pressing and welding height, and then the corresponding pole position is pressed and welded to ensure welding quality.

[0068] After the height measurement is completed, the driving member 41 drives the height measuring sensor 42 away from the height measuring through hole 212 to reset to the first position at the edge of the driving member 41 and wait to avoid the extended height measuring sensor 42 interfering with the external welding device and affecting the welding.

[0069] In this embodiment, if Figure 5 As shown, the first clamping member 221 not only has a welding through hole in the middle, but also has an annular cavity 222 around the lower end of the welding through hole. The bottom of the annular cavity 222 is through-set, and a gas input port 223 is provided above the annular cavity 222. The other end of the gas input port 223 is connected to the output end of the gas input member 9, and the gas input port 223 and the annular cavity 222 form a gas delivery channel; the gas input member 9 is configured to deliver inert gas to the area to be welded through the gas delivery channel; the air intake monitoring member is connected to the gas input member 9.

[0070] During welding, gas input member 9 delivers inert gas into the gas delivery channel. The inert gas reaches the welded area through gas inlet port 223 and annular cavity 222, ensuring a stable gas environment in the welded area and improving welding quality. The gas inlet monitoring member monitors the inlet gas flow rate in gas input member 9 during the inert gas delivery process, ensuring a stable welding gas environment without wasting inert gas, thus saving costs.

[0071] The working process of the battery module welding and pressing mechanism provided in this embodiment is as follows:

[0072] The lifting structure 11 drives the clamping structure 2 to approach the material, and the lifting structure 11 stops moving after reaching the preset position. The driving member 41 drives the height measuring sensor 42 to move toward the height measuring through hole 212 until the measuring end of the height measuring sensor 42 and the height measuring through hole 212 are at the same position and stop. The measuring sensor measures the actual height of the pole through the height measuring through hole 212. Based on the detected height data, the lifting structure 11 drives the clamping structure 2 to continue pressing down until the first clamping member 221 is pressed against the area to be welded, and the second clamping member 224 is pressed against the area to be welded or welded adjacent to the area to be welded. After the height measurement is completed, the driving member 41 drives the height measuring sensor 42 away from the height measuring through hole 212 to reset to the first position at the edge of the driving member 41 and enter standby mode.

[0073] The external laser welding device emits laser light through the second through hole 311 and the first through hole 211 in sequence, and then through the welding through hole in the middle of the first pressing member 221 to irradiate the bottom end of the first pressing member 221, that is, the intersection of the battery pole and the busbar to be welded, for welding. While welding, the external gas source and the gas input member 9 are started, and the gas input member 9 is used to transport inert gas into the gas delivery channel. The inert gas reaches the area to be welded through the gas input port 223 and the annular cavity 222. The first dust suction end absorbs impurities generated during welding in the area to be welded, and the second dust suction end is used to absorb impurities splashed into the box body 31 during welding. The output end of the dust suction pipe 321 discharges the impurities absorbed by the first and second dust suction ends.

[0074] Example 2

[0075] This embodiment provides a welding device, such as Figures 6 to 8 As shown, it includes a conveying mechanism 5, a welding mechanism 7, and the aforementioned cell module welding and clamping mechanism. The conveying structure is a two-axis conveying device in the horizontal direction. Two cell module welding and clamping mechanisms are provided, which are arranged on both sides of the conveying mechanism 5. They are configured to convey the cell modules to be welded to the welding station or remove the cell modules that have been welded from the welding station.

[0076] The base frame 1 at the bottom of the conveying structure is also fixed with a positioning structure 8, which includes a positioning sensor 81 and a positioning pin 82. The positioning mechanism is configured to position each pole of the battery cell module at the welding station. The positioning pin 82 can serve as a positioning reference. The positioning sensor 81 can be a visual sensor or a laser sensor. The method shown in the figure is a visual sensor, which is installed as a camera to locate the weld point by taking pictures. The welding mechanism 7 includes a transfer mechanism 71 and a laser welding head 72. The laser welding head 72 is installed at the driving end of the transfer mechanism 71. The transfer mechanism 71 is configured to drive the laser welding head 72 to move horizontally and vertically to perform welding on the welding position clamped by the battery cell module welding clamping mechanism.

[0077] Thus, the conveying mechanism 5 enables loading and unloading of the cell module, the positioning mechanism accurately positions each pole of the cell module, and the cell module welding and clamping mechanism compresses each welded point in a small area and detects the welding height one by one. This, in conjunction with the welding mechanism 7, allows efficient and high-quality welding to be completed, ensuring the overall welding quality of the cell module. Because this embodiment has the cell module welding and clamping mechanism of Example 1, it possesses all of its advantages.

[0078] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A battery module welding and pressing mechanism, characterized in that: include: A base frame, one side of which is connected to a lifting structure, and the lifting structure is used to drive the base frame to rise and fall; A clamping structure, comprising a clamping support plate and a clamping member group, wherein the clamping support plate is arranged on a side of the base frame away from the lifting structure, and a plurality of the clamping member groups are arranged, and the plurality of the clamping member groups are evenly distributed on the clamping support plate; The dust removal structure includes a box body and a dust removal assembly. The box body cover is arranged at the top end of the clamping support plate. The box body is used to prevent impurities generated during welding from splashing out. The fixed end of the dust removal assembly is connected to the base frame, and the suction end of the dust removal assembly is connected to the box body and / or the clamping member group to absorb impurities generated during welding.

2. The battery module welding and pressing mechanism according to claim 1, characterized in that: The pressing member group includes: a first pressing member and a second pressing member distributed on the side of the first pressing member, and a plurality of the first pressing members and the second pressing members are provided. The first pressing member is used to press the area to be welded, and the second pressing member is used to press the unwelded area and / or welded area adjacent to the area to be welded.

3. The battery module welding and pressing mechanism according to claim 2, characterized in that: A first through hole is provided on the pressing support plate corresponding to the first pressing member, and a second through hole is provided on the box body corresponding to the first through hole; the external welding device is configured to emit a laser through the first through hole and the second through hole to weld the material pressed by the first pressing member.

4. The battery module welding and pressing mechanism according to claim 1, characterized in that: The pressing support plate is also provided with a height measuring through hole corresponding to the area to be welded; The battery module welding and clamping mechanism further includes a height measuring structure, which is configured to measure the height of the area to be welded through the height measuring through hole.

5. The battery module welding and pressing mechanism according to claim 4, characterized in that: The height measuring structure includes a driving member and at least one height measuring sensor; the fixed end of the driving member is installed at the first position of the pressing support plate, and the output end of the driving member is installed with at least one height measuring sensor; The height measuring sensor has a measuring state in which it is driven by the driving member to move to the height measuring through hole position to measure the material height, and a standby state in which it moves away from the height measuring through hole to the first position.

6. The battery module welding and pressing mechanism according to claim 2, characterized in that: The first pressing member and the second pressing member are both movably mounted on the pressing support plate via an elastic component; The elastic component includes a guide member and an elastic member, one end of the guide member is installed on the first pressing member or the second pressing member, the other end of the guide member is installed on the pressing support plate, the elastic member is sleeved on the guide member, one end of the elastic member abuts the first pressing member or the second pressing member, and the other end abuts the pressing support plate.

7. The battery module welding and pressing mechanism according to claim 2, characterized in that: The battery module welding and pressing mechanism further includes a gas input component and an air intake monitoring component, and the fixed end of the gas input component is connected to the pressing support plate; An annular cavity is formed around the inner cavity of the first pressing member at one end close to the material, and a gas input port is formed on one side of the first pressing member. The gas input port is connected to the annular cavity, and the end of the gas input port away from the annular cavity is connected to the output end of the gas input member; the gas input port and the annular cavity form a gas delivery channel; The gas input member is configured to deliver inert gas to the area to be welded through the gas delivery channel; The gas intake monitoring component is in communication with the gas input component and is used for monitoring the intake gas flow rate in the gas input component during the process of the gas input component conveying the inert gas.

8. The battery module welding and pressing mechanism according to claim 1, characterized in that: The dust removal assembly includes a dust suction pipeline, a fixed end of the dust suction pipeline is fixedly connected to the base frame, a first dust suction end of the dust suction pipeline is connected to the clamping member group and is used to absorb impurities generated in the area to be welded during welding, a second dust suction end of the dust suction pipeline is connected to the box body and is used to absorb impurities splashed into the box body during welding, and an output end of the dust suction pipeline is connected to an external air source to discharge impurities absorbed by the first dust suction end and the second dust suction end.

9. The battery module welding and pressing mechanism according to claim 8, characterized in that: The dust removal component further includes a wind speed detection component, a detection end of which is connected to the output end of the dust suction pipeline and is used to detect the dust suction wind speed in the dust suction pipeline.

10. A welding device, characterized in that: The welding device comprises a conveying mechanism, a welding mechanism and a cell module welding and pressing mechanism according to any one of claims 1 to 9; The battery module welding clamping mechanism is installed on the conveying mechanism, and the conveying mechanism can move the battery module welding clamping mechanism to the welding area of ​​the battery module to be welded or remove the battery module welding clamping mechanism from the welded material; The welding mechanism includes a transfer mechanism and a laser welding head. The laser welding head is installed at the driving end of the transfer mechanism. The transfer mechanism is configured to drive the laser welding head to move horizontally and vertically to perform welding on the area to be welded that is pressed by the welding clamping mechanism of the battery cell module.

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