Battery welding and pressing tool, battery welding device and battery production line

Abstract

The utility model provides a kind of battery welding pressure tool, battery welding device and battery production line, wherein, battery welding pressure tool includes: pressure block, cavity is provided in pressure block;First import and export, both are set on pressure block, and first import and export are all communicated with cavity, first import is used to make laser shoot in, and welding area is formed in the range of export;Second import, set on pressure block for gas inlet, and second import is communicated with cavity. In the above structure, the position to be welded does not need to be directly contacted by pressure plate and other structures for pressure, so that the molten liquid after welding will not be adhered;At the same time, the position to be welded is pressed by air flow without contact, even if the material is melted and depressed during welding, the depression can also be continuously pressed, so as to ensure the welding effect.

Description

Technical Field

[0001] This utility model relates to the field of battery production equipment technology, specifically to battery welding and clamping fixtures, battery welding devices, and battery production lines. Background Technology

[0002] During battery production, after the positive electrode, negative electrode, and separator are combined to form a battery cell, a Mylar film needs to be wrapped around the cell. The purpose of the Mylar film is to prevent short circuits caused by friction between the battery cell and the aluminum casing. During assembly, the Mylar film on the battery cell is first welded to the plastic parts on the cover plate. Then, the battery cell and the top cover are inserted into the aluminum casing. Finally, the top cover and the aluminum casing are welded together to form a single battery cell.

[0003] Furthermore, the Mylar membrane of the battery cell and the Mylar membrane on the cover plate are typically connected by laser welding. To ensure the welding effect, the welding position needs to be pressed tightly to prevent wrinkles in the Mylar membrane. In existing technology, a transparent glass plate is usually used to press the welding position tightly. The laser shines through the glass plate into the welding position, causing the Mylar membrane and the plastic part to melt. After cooling, the battery cell and the cover plate are connected together.

[0004] However, during the above processing, on the one hand, the material tends to stick to the glass plate after melting, and the welding position is easily pulled when the tooling is removed, resulting in weak welding; on the other hand, the material causes depressions after melting, and the glass plate cannot apply pressure to the depressions at all times, resulting in poor welding quality. Utility Model Content

[0005] In view of this, the present invention provides a battery welding clamping fixture, a battery welding device, and a battery production line to solve the problem of poor welding quality and weak bonding between the Mylar membrane and the end cap in the existing battery welding process.

[0006] In a first aspect, this utility model provides a battery welding clamping fixture, comprising: a clamping block, wherein a cavity is provided inside the clamping block; a first inlet and an outlet, both disposed on the clamping block and connected to the cavity, wherein the first inlet is used to allow laser to enter and a welding area is formed within the range of the outlet; and a second inlet, disposed on the clamping block, wherein the second inlet is used to introduce gas and connected to the cavity.

[0007] Optionally, a sealing structure is provided at the outlet.

[0008] Optionally, the clamping block is provided with an annular groove surrounding the outlet, and the sealing structure includes a sealing ring disposed within the annular groove.

[0009] Optionally, the clamping block is provided with an annular boss at the outlet, and the sealing structure is provided on the end face of the annular boss.

[0010] Optionally, a sealing plate is provided at the first inlet, and the sealing plate is made of a light-transmitting material.

[0011] Optionally, the clamping block has a recess at the first inlet, and the sealing plate is disposed in the recess.

[0012] Optionally, a connector is provided at the second inlet.

[0013] Secondly, this utility model provides a battery welding device, including: a clamping mechanism for clamping a battery to be welded; a laser movably disposed thereon; and the aforementioned battery welding clamping fixture, wherein the battery welding clamping fixture is connected to the laser.

[0014] Optionally, the battery welding apparatus also includes a reflective structure disposed between the laser and the clamping block, the reflective structure being used to reflect the laser emitted by the laser into the first inlet of the clamping block.

[0015] Optionally, the battery welding apparatus further includes a first drive mechanism for driving the clamping mechanism to move; and / or, the battery welding apparatus further includes a second drive mechanism for driving the laser to move.

[0016] Thirdly, this utility model provides a battery production line, including the aforementioned battery welding and clamping fixture, or including the aforementioned battery welding device.

[0017] Beneficial effects

[0018] Using the technical solution of this utility model, during welding, the laser enters from the first inlet of the clamping block, passes through the cavity, and exits from the outlet, irradiating the position to be welded. That is, the laser irradiation range is the range of the outlet, and the position to be welded does not require direct contact clamping with a clamping plate or other structure. Simultaneously, gas is introduced through the second inlet, and the gas acts on the position to be welded from the outlet through the cavity, thus applying airflow pressure to the position. In the above structure, the position to be welded does not require direct contact clamping with a clamping plate or other structure, therefore the molten liquid after welding will not stick together; at the same time, the airflow provides non-contact clamping to the position to be welded, so even if the material melts and causes depressions during welding, the depressions can still be subjected to continuous clamping force, thereby ensuring the welding effect. Therefore, the technical solution of this utility model solves the problem of weak welding and poor welding quality between the Mylar membrane and the end cap in the existing battery welding process. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 A side view of an embodiment of the battery welding clamping fixture of this utility model is shown;

[0021] Figure 2 It shows Figure 1 A schematic diagram of the other side of the battery welding clamping fixture;

[0022] Figure 3 It shows Figure 1 A schematic diagram of the battery welding clamping fixture during welding;

[0023] Figure 4 It shows Figure 3 Schematic diagram of the internal structure of the battery welding clamping fixture;

[0024] Figure 5 A schematic diagram of one side of an embodiment of the battery welding device of this utility model is shown;

[0025] Figure 6 It shows Figure 5 A schematic diagram of one side of the battery welding clamping fixture in the battery welding device;

[0026] Figure 7 It shows Figure 5 A schematic diagram of the other side of the battery welding clamping fixture in the battery welding device.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Battery;

[0029] 2. Laser;

[0030] 10. Clamping block; 11. Cavity; 12. Annular groove; 13. Annular boss; 14. Recess;

[0031] 20. First import;

[0032] 30. Exports;

[0033] 40. Secondary imports;

[0034] 50. Sealed structure;

[0035] 60. Sealing plate;

[0036] 70. Connector;

[0037] 100. Clamping mechanism;

[0038] 200. Laser;

[0039] 300. Reflective structure;

[0040] 400. First drive mechanism;

[0041] 500. Second drive mechanism. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0043] During battery production, after the positive electrode, negative electrode, and separator are combined to form a battery cell, a Mylar film needs to be wrapped around the cell. The purpose of the Mylar film is to prevent short circuits caused by friction between the battery cell and the aluminum casing. During assembly, the Mylar film on the battery cell is first welded to the plastic parts on the cover plate. Then, the battery cell and the top cover are inserted into the aluminum casing. Finally, the top cover and the aluminum casing are welded together to form a single battery cell.

[0044] Furthermore, the Mylar membrane of the battery cell and the Mylar membrane on the cover plate are typically connected by laser welding. To ensure the welding effect, the welding position needs to be pressed tightly to prevent wrinkles in the Mylar membrane. In existing technology, a transparent glass plate is usually used to press the welding position tightly. The laser shines through the glass plate into the welding position, causing the Mylar membrane and the plastic part to melt. After cooling, the battery cell and the cover plate are connected together.

[0045] However, the applicant discovered two problems in the above processing procedure during production practice:

[0046] First, the Mylar membrane and plastic parts melt under laser irradiation. The molten material easily adheres to the glass plate, causing contamination of the indenter with each weld, requiring frequent cleaning. Furthermore, after welding, because some of the molten material adheres to the glass plate, removing the fixture can easily pull on the welded area, causing it to lift or even break, resulting in a weak weld.

[0047] Secondly, as the material melts and changes from a solid to a liquid state, the liquid at the welding point will cause a depression. Since the shape of the glass plate is fixed, a gap is formed between the concave area at the welding point and the glass plate, meaning the welding point is suspended. The glass plate cannot consistently apply pressure to the depression, resulting in poor welding quality.

[0048] To address the aforementioned issues, this application provides a battery welding clamping fixture, a battery welding device, and a battery production line, as detailed below.

[0049] like Figures 1 to 4 As shown, an embodiment of the battery welding clamping fixture according to this application includes a clamping block 10, a first inlet 20, an outlet 30, and a second inlet 40. The clamping block 10 contains a cavity 11. Both the first inlet 20 and the outlet 30 are disposed on the clamping block 10 and are connected to the cavity 11. The first inlet 20 is used to allow laser light to enter, and a welding area is formed within the range of the outlet 30. The second inlet 40 is disposed on the clamping block 10, is used to introduce gas, and is connected to the cavity 11.

[0050] Using the technical solution of this embodiment, during welding, the laser 2 enters from the first inlet 20 of the clamping block 10, passes through the cavity 11, and exits from the outlet 30, irradiating the position to be welded. That is, the irradiation range of the laser 2 is the range of the outlet 30, and the position to be welded does not require direct contact clamping using a clamping plate or other structure. Simultaneously, gas is introduced through the second inlet 40, and the gas acts on the position to be welded from the outlet 30 through the cavity 11, i.e., applying airflow pressure to the position to be welded. In the above structure, the position to be welded does not require direct contact clamping using a clamping plate or other structure, so the molten liquid after welding will not stick together; at the same time, the airflow provides non-contact clamping to the position to be welded, so even if the material melts and causes a depression during welding, the depression can still be subjected to continuous clamping force, thereby ensuring the welding effect. Therefore, the technical solution of this embodiment solves the problem of poor welding quality and weak bonding between the Mylar membrane and the end cap in the prior art battery welding process.

[0051] It should be noted that the following description uses the application of the battery welding clamping fixture in this embodiment to welding the Mylar membrane of the battery cell and the plastic cover as an example. However, those skilled in the art will understand that the battery welding clamping fixture in this embodiment can also be applied to other welding processes in battery processing. The following description should not be construed as meaning that the battery welding clamping fixture in this embodiment can only be applied to welding the Mylar membrane of the battery cell and the plastic cover.

[0052] like Figure 1 , Figure 2 and Figure 4As shown, the clamping block 10 is roughly a plate-like structure with an internal cavity 11. Of course, the shape of the clamping block 10 can be designed according to actual assembly needs, and is not limited to... Figure 1 and Figure 2 The shape shown. For example, the clamping block 10 can also be block-shaped, irregularly shaped, etc.

[0053] from Figure 1 and Figure 2 As can be seen, the clamping block 10 is provided with a first inlet 20 and an outlet 30, both of which are connected to the cavity 11. During processing, the laser 2 enters through the first inlet 20, passes through the cavity 11, and exits through the outlet 30. Those skilled in the art will understand that the area enclosed by the outlet 30 is the processing area of ​​the laser 2, which is a structure in which the surface to be welded does not directly contact the laser 2 during processing.

[0054] Furthermore, the outlet 30 is pressed against the surface to be welded, thereby ensuring the airtightness between the surface to be welded and the cavity 11.

[0055] from Figure 3 and Figure 4 As can be seen, the first inlet 20 and the outlet 30 are respectively set on two opposite surfaces of the clamping block 10. Therefore, after the laser 2 enters from the first inlet 20, it can pass directly through the cavity 11 in a straight line and exit from the outlet 30.

[0056] In some embodiments not shown, the first inlet 20 and the outlet 30 may also be respectively disposed on two non-opposing surfaces of the clamping block 10 (e.g., two adjacent surfaces, or two surfaces at a certain angle to each other). In this case, by providing one or more reflectors in the cavity 11, the path of the laser 2 in the cavity 11 can be adjusted to ensure that the laser enters from the first inlet 20 and exits from the outlet 30.

[0057] from Figure 1 , Figure 2 and Figure 4 As can be seen, the clamping block 10 is also equipped with a second inlet 40, which is connected to the cavity 11. High-pressure gas can be introduced through the second inlet 40. After passing through the cavity 11, the high-pressure gas can directly act on the outlet 30, thereby applying gas pressure to the surface to be welded. The gas pressure can continuously clamp the Mylar membrane.

[0058] Furthermore, using high-pressure gas to compress the Mylar film has the following advantages:

[0059] 1. Gas compression is a non-contact compression method, so the materials will not stick together after melting;

[0060] 2. The effective range of laser 2 is within the range of exit 30, that is, there is no structure in contact with the surface to be welded, so there is basically no problem of material melting and contamination of the tooling.

[0061] 3. Gas compression is not affected by deformation of the surface to be welded. Even if the material melts and local depressions occur, the depressions can still be subjected to continuous compression force.

[0062] like Figure 2 and Figure 4 As shown, in this embodiment, a sealing structure 50 is provided at the outlet 30. During processing, the sealing structure 50 can be tightly attached to the surface to be welded, thereby sealing the gap between the surface to be welded and the clamping block 10. In this way, the high-pressure airflow can better act on the surface to be welded from the outlet 30, preventing the airflow from leaking out from the gap between the surface to be welded and the clamping block 10, thereby reducing the clamping force.

[0063] like Figure 2 and Figure 4 As shown, in the technical solution of this embodiment, the clamping block 10 is provided with an annular groove 12, which surrounds the outlet 30. The sealing structure 50 includes a sealing ring, which is disposed in the annular groove 12.

[0064] Specifically, an annular groove 12 is disposed on the surface where the outlet 30 of the clamping block 10 is located. Preferably, the shape of the annular groove 12 is adapted to the shape of the outlet 30. In this embodiment, the outlet 30 is rectangular, therefore the annular groove 12 is also adapted to be rectangular. Furthermore, the annular groove 12 surrounds the outer side of the outlet 30.

[0065] The sealing structure 50 includes a sealing ring disposed within the annular groove 12, and at least a portion of the sealing ring protrudes beyond the annular groove 12.

[0066] During processing, the clamping block 10 is pressed against the surface to be welded, and the sealing ring is compressed, which seals the gap between the surface to be welded and the clamping block 10, thereby ensuring that the high-pressure airflow acts better on the surface to be welded.

[0067] like Figure 1 and Figure 4 As shown, in the technical solution of this embodiment, the clamping block 10 is provided with an annular boss 13 at the outlet 30, and the sealing structure 50 is provided on the end face of the annular boss 13.

[0068] Specifically, an annular boss 13 is provided at the outlet 30, and the annular boss 13 is a square boss, with the outlet 30 formed on the annular boss 13. Figure 2 As can be seen, the annular groove 12 is provided on the end face of the annular boss 13, and the sealing ring is provided inside the annular groove 12, that is, on the end face of the annular boss 13.

[0069] During welding, the end face of the annular boss 13 presses against the surface to be welded. By setting the annular boss 13, the contact area between the pressing block 10 and the surface to be welded is small, so the pressure applied to the sealing ring is greater, which can make the sealing ring deform better and thus improve the sealing effect.

[0070] In some embodiments not shown, if the shape of the clamping block 10 is small, it is also possible to omit the annular boss 13.

[0071] like Figure 1 and Figure 4 As shown, in the technical solution of this embodiment, a sealing plate 60 is provided at the first inlet 20, and the sealing plate 60 is made of a light-transmitting material.

[0072] Specifically, the sealing plate 60 creates a closed space within the cavity 11. For example... Figure 4 As shown, the surface to be welded, the sealing structure 50, the inner wall of the cavity 11, and the sealing plate 60 constitute a closed space. Therefore, the high-pressure gas entering from the second inlet 40 can act entirely on the surface to be welded, thereby improving the airflow pressing effect.

[0073] Preferably, since the laser 2 needs to be emitted from the first inlet 20, the sealing plate 60 is selected as a transparent glass plate to reduce the loss of the laser 2.

[0074] Furthermore, from Figure 1 As can be seen, a recess 14 is provided at the first inlet 20 of the clamping block 10, and the sealing plate 60 is disposed in the recess 14, thereby making the connection between the sealing plate 60 and the clamping block 10 tighter. The edge of the sealing plate 60 and the stepped surface of the recess 14 can be connected together by welding, fasteners, or other methods.

[0075] like Figure 1 , Figure 2 and Figure 4 As shown, a connector 70 is provided at the second inlet 40. The connector 70 is used to connect to an external gas supply line, thereby allowing high-pressure gas to enter the cavity 11.

[0076] like Figures 5 to 7 As shown, this application also provides a battery welding apparatus. An embodiment of the battery welding apparatus according to this application includes a clamping mechanism 100, a laser 200, and the aforementioned battery welding clamping fixture. The clamping mechanism 100 is used to clamp the battery 1 to be welded. The laser 200 is used to emit a laser 2. The aforementioned battery welding clamping fixture is connected to the laser 200. Further, the clamping mechanism 100 and / or the laser 200 are movably arranged.

[0077] Those skilled in the art will understand that laser welding of the battery 1 can be achieved by moving the laser 2 relative to the battery 1. Therefore, laser welding of the battery 1 can be achieved by movably arranging at least one of the clamping mechanism 100 and the laser 200.

[0078] In one embodiment, the clamping mechanism 100 is fixed and the laser 200 is movable; in another embodiment, the clamping mechanism 100 is movable and the laser 200 is fixed; in yet another embodiment, both the clamping mechanism 100 and the laser 200 may be movable.

[0079] In this embodiment, the battery 1 to be welded (in this embodiment, the battery cell and the cover plate) is fixed by the clamping mechanism 100. The laser 200 emits a laser and is movable relative to the clamping mechanism 100, thereby welding different positions of the battery 1. Since the battery welding clamping fixture is connected to the laser 200, when the laser 200 moves, it can drive the battery welding clamping fixture to move synchronously.

[0080] Optionally, the battery welding clamping fixture can be fixed to the laser 200 or movably connected to the laser 200.

[0081] During the welding process, the annular boss 13 of the clamping block 10 of the battery welding clamping fixture is in close contact with the surface to be welded. Then, high-pressure gas is introduced through the second inlet 40 to clamp the surface to be welded. The laser 2 enters from the first inlet 20 and exits from the outlet 30. The working range of the laser 2 is the area enclosed by the outlet 30.

[0082] like Figure 3 and Figure 7 As shown, in the technical solution of this embodiment, the battery welding device further includes a reflective structure 300, which is disposed between the laser 200 and the clamping block 10. The reflective structure 300 is used to reflect the laser 2 emitted by the laser 200 into the first inlet 20 of the clamping block 10.

[0083] Specifically, in this embodiment, the laser 2 is emitted vertically and enters the surface to be welded horizontally. Therefore, the reflective structure 300 is needed to change the path of the laser 2. In this embodiment, the reflective structure 300 is a 45° reflector.

[0084] Of course, depending on the actual needs of the laser path 2, those skilled in the art can adjust the number of reflectors, the arrangement of the reflectors, and the mirror angle of the reflectors to make adaptive adjustments.

[0085] In some embodiments not shown, if the laser 2 emission direction is the same as the direction of its entry into the surface to be welded, then it is also a feasible implementation to omit the reflective structure 300.

[0086] like Figure 5 As shown, in the technical solution of this embodiment, the battery welding device further includes a first driving mechanism 400, which is used to drive the clamping mechanism 100 to move.

[0087] Optionally, the first drive mechanism 400 may include a linear module, which can enable the clamping mechanism 100 to move the battery 1 to be welded to the welding station.

[0088] Optionally, the first drive mechanism 400 may include a rotary motor, which can cause the clamping mechanism 100 to rotate the battery 1 to be welded, thereby enabling the laser 2 to weld different circumferential positions of the battery 1.

[0089] like Figure 5 As shown, in the technical solution of this embodiment, the battery welding device further includes a second driving mechanism 500, which is used to drive the laser 200 to move.

[0090] Optionally, the second drive mechanism 500 may include a linear module, through which the position of the laser 200 can be adjusted so that the laser 200 can weld different parts of the battery 1.

[0091] Optionally, the second drive mechanism 500 may include an X-axis linear module, a Y-axis linear module, and a Z-axis linear module.

[0092] This application also provides a battery production line, which, according to embodiments of this application, includes the battery welding clamping fixture described above, or includes the battery welding apparatus described above.

[0093] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery welding clamping fixture, characterized in that, include: A clamping block (10) is provided with a cavity (11); The first inlet (20) and the outlet (30) are both provided on the clamping block (10), and the first inlet (20) and the outlet (30) are both connected to the cavity (11). The first inlet (20) is used to allow the laser to enter, and a welding area is formed within the range of the outlet (30). A second inlet (40) is provided on the clamping block (10). The second inlet (40) is used to introduce gas and is connected to the cavity (11).

2. The battery welding clamping fixture according to claim 1, characterized in that, A sealing structure (50) is provided at the outlet (30).

3. The battery welding clamping fixture according to claim 2, characterized in that, The clamping block (10) is provided with an annular groove (12), which surrounds the outlet (30). The sealing structure (50) includes a sealing ring, which is disposed in the annular groove (12).

4. The battery welding clamping fixture according to claim 2, characterized in that, The clamping block (10) is provided with an annular boss (13) at the outlet (30), and the sealing structure (50) is provided on the end face of the annular boss (13).

5. The battery welding clamping fixture according to any one of claims 1 to 4, characterized in that, A sealing plate (60) is provided at the first inlet (20), and the sealing plate (60) is made of a light-transmitting material.

6. The battery welding clamping fixture according to claim 5, characterized in that, The clamping block (10) has a recess (14) at the first inlet (20), and the sealing plate (60) is disposed in the recess (14).

7. A battery welding apparatus, characterized in that, include: A clamping mechanism (100) is used to clamp the battery (1) to be welded; Laser (200); The battery welding clamping fixture as described in any one of claims 1 to 6, wherein the battery welding clamping fixture is connected to the laser (200), The clamping mechanism (100) and / or the laser (200) are movably disposed.

8. The battery welding apparatus according to claim 7, characterized in that, The battery welding device further includes a reflective structure (300) disposed between the laser (200) and the clamping block (10), the reflective structure (300) being used to reflect the laser (2) emitted by the laser (200) into the first inlet (20) of the clamping block (10).

9. The battery welding apparatus according to claim 7, characterized in that, The battery welding device further includes a first driving mechanism (400) for driving the clamping mechanism (100) to move; and / or, the battery welding device further includes a second driving mechanism (500) for driving the laser (200) to move.

10. A battery production line, characterized in that, It includes the battery welding clamping fixture as described in any one of claims 1 to 6, or the battery welding apparatus as described in any one of claims 7 to 9.

Images