Ink-jet printing device for improving film thickness of R-angle area of weld joint of battery cell

Abstract

The utility model provides an ink-jet printing device for improving the film thickness of an R-angle area of a weld joint of a battery cell, which comprises a first ink-jet printing unit formed by a spray head for ink-jet printing and a butting clamp, and the spray head comprises a plurality of nozzles; the opposite-vertex clamp is used for clamping a battery cell and comprises a first clamping component and a second clamping component, the first clamping component is in contact with a first end face of the battery cell, the second clamping component is in contact with a second end face of the battery cell, and a welding seam R-angle area exists between the second end face and the side face of the battery cell; the second clamping part is further provided with a first refrigeration unit. On the premise of not changing a UV ink-jet printing process and a UV coating, only by additionally arranging a refrigeration unit on the inner side of the clamp, the problem of film thickness reduction of a welding seam R-angle area is greatly improved after the temperature of the welding seam R-angle area of the battery cell splicing surface laser welding is reduced, and meanwhile, the film thickness uniformity of the area is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, and in particular to an inkjet printing device for improving the film thickness in the R-corner region of the cell weld. Background Technology

[0002] Lithium-ion batteries are rechargeable batteries that primarily function by the movement of lithium ions between the positive and negative electrodes. Compared to traditional nickel-cadmium, nickel-metal hydride, and lead-acid batteries, lithium-ion batteries have higher volumetric and gravimetric energy density, higher energy conversion efficiency, better cycle life, and higher rate performance. They have broad application prospects in the field of electric mobility vehicles. Currently, high-capacity, long-cycle stability, low energy loss, and high safety lithium batteries are widely used in various fields such as automobiles, energy storage, and electronic products.

[0003] With the development and application of new-generation power battery structures—CTP (Cell to Pack, integrating cells into a battery pack, eliminating the intermediate module stage), CTB (Cell to Body, integrating the battery pack and vehicle frame, making the battery an integral part of the vehicle body), and CTC (Cell to Chassis, integrating cells into the vehicle chassis, completely eliminating the concept of a separate battery pack)—and 800V high-voltage fast charging technology for power batteries, the upgraded GB 38031 standard, "Safety Requirements for Power Batteries for Electric Vehicles," explicitly requires that thermal diffusion prevent fires and explosions. This places higher demands on the safety of cell and battery PACK system coatings, including insulation, flame retardancy, heat insulation, and sealing. Traditional blue film coating processes can no longer meet the standard requirements, and the industry has begun to explore a new UV inkjet printing coating solution to better match the current high standards and safety demands. Lithium-ion battery UV inkjet printing (ultraviolet inkjet printing) uniformly covers the cell surface with a high-adhesion insulating coating, significantly improving the cell's insulation, voltage resistance, rust prevention, and wear resistance. However, the specific performance is strongly correlated with the coating thickness.

[0004] In lithium battery production, laser welding technology has been widely adopted to improve production efficiency, yield, and sealing stability, significantly advancing manufacturing processes. UV inkjet printing, through software algorithms, applies voltage to a piezoelectric ceramic valve, causing it to expand and contract, ejecting ink from the nozzle and forming any specified pattern on the output medium surface. To better meet process requirements and leverage significant advantages, the piezoelectric printhead is designed for a stable viscosity range of 5–50 mPa·s for the coating, while the room temperature viscosity of UV coatings is 35–110 mPa·s. To ensure stable ink output from the printhead, the coating is typically preheated to 30–50°C, corresponding to a viscosity of 30–50 mPa·s. In the battery cell manufacturing process, UV inkjet printing is typically performed on both sides of the cell separately, and laser welding is then carried out at the joint between the two sides to meet design requirements. After welding, the weld seam left behind has a significant arc-shaped R-angle. Due to the large slope at the R-angle of the weld seam after laser welding, the low-viscosity coating has a large flow on its surface, which greatly reduces the amount of UV coating adhering during UV inkjet printing. Macroscopically, this means that the UV coating film thickness in the weld seam R-angle area is significantly thinner than that on other planes (thinning amount ≥40%). This causes the "weakest link" effect, resulting in a significant decrease in the coating performance (insulation withstand voltage, corrosion resistance, wear resistance, etc.) in this area, which cannot meet the process and customer product requirements, resulting in a large number of defective products and causing significant losses for lithium battery companies. Utility Model Content

[0005] Based on the above problems, this utility model provides an inkjet printing device to improve the film thickness in the R-corner region of the battery cell weld, aiming to solve the problem of thinning of the film thickness in the R-corner region of the battery cell weld in the existing spraying process.

[0006] An inkjet printing apparatus for improving the film thickness in the R-corner region of a battery cell weld seam includes a first inkjet printing unit formed by a printhead for inkjet printing and a top clamp, wherein the printhead includes a plurality of nozzles.

[0007] The top clamp is used to clamp the battery cell, including a first clamping component and a second clamping component. The first clamping component contacts a first end face of the battery cell, and the second clamping component contacts a second end face of the battery cell. There is a weld R-corner area between the second end face and the side of the battery cell.

[0008] Both the first clamping component and the second clamping component are provided with a rotating shaft;

[0009] The second clamping component is also equipped with a first cooling unit;

[0010] In the first inkjet printing unit, the nozzles face the side of the battery cell.

[0011] Furthermore, the first end face is the non-welded end face of the battery cell, and the second end face is the welded end face of the battery cell.

[0012] Furthermore, the second clamping component is also equipped with a first position sensor.

[0013] Furthermore, the first cooling unit is disposed inside the second clamping component.

[0014] Furthermore, the shape of the outer side of the second clamping component is adapted to the cross-sectional shape of the side of the battery cell;

[0015] The first cooling unit is a ring formed along the outer side region near the second clamping component.

[0016] Furthermore, it includes a second inkjet printing unit formed by a printhead, a battery cell side clamp, and a support base;

[0017] The support base is used to support one of the non-welded ends of the battery cell;

[0018] The cell side clamp is used to hold the area on the side of the cell that is close to the welding end face of the cell;

[0019] A second cooling unit is provided on the side clamp of the battery cell;

[0020] In the second inkjet printing unit, the nozzle faces the welding end face of the battery cell.

[0021] Furthermore, a second position sensor is also provided on the side clamp of the battery cell.

[0022] Furthermore, the second cooling unit is located inside the side clamp of the battery cell.

[0023] Furthermore, the shape of the inner side of the cell side clamp is adapted to the cross-sectional shape of the cell side.

[0024] The second cooling unit is a ring formed along the inner side region of the clamp near the side of the battery cell.

[0025] Furthermore, the battery cells are either cylindrical or prismatic.

[0026] The beneficial technical effects of this utility model are as follows: In the UV inkjet printing process, without changing the UV inkjet printing process and UV coating, by simply adding a cooling unit to the inner side of the fixture to reduce the temperature of the R-corner area of ​​the laser welding weld on the cell splicing surface, the problem of film thickness reduction in the R-corner area of ​​the weld is greatly improved, and the uniformity of film thickness in this area is also improved. Attached Figure Description

[0027] Figure 1 This is a graph showing the trend of UV coating viscosity as a function of temperature.

[0028] Figure 2 This is a schematic diagram of the structure of the first inkjet printing unit of an inkjet printing device for improving the film thickness in the R-corner region of a battery cell weld seam according to the present invention.

[0029] Figure 3 This is a left view of the top clamp in the first inkjet printing unit of an inkjet printing device for improving the film thickness in the R-corner region of a battery cell weld, according to the present invention.

[0030] Figure 4 This is a schematic diagram of the structure of the second inkjet printing unit of an inkjet printing device for improving the film thickness in the R-corner region of a battery cell weld seam according to the present invention.

[0031] Figure 5 This is a top view of the cell side clamp in the second inkjet printing unit of an inkjet printing device for improving the film thickness in the R-corner region of a cell weld seam according to the present invention.

[0032] Figure 6 This is a process flow diagram of an inkjet printing device for improving the film thickness in the R-corner region of a battery cell weld seam, according to this utility model.

[0033] in,

[0034] 1-Spray head; 101-Nozzle;

[0035] 201-First clamping component; 202-Second clamping component; 203-Rotation shaft; 204-First cooling unit; 205-First position sensor;

[0036] 3-Battery cell; 301-Battery cell side; 302-Battery cell non-welded end face; 303-Battery cell welded end face;

[0037] 4-Cell side clamp; 401-Second cooling unit; 402-Second position sensor;

[0038] 5-Support base;

[0039] A - First inkjet printing unit;

[0040] B - Second inkjet printing unit. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0043] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0044] See Figure 2 This utility model provides an inkjet printing device for improving the film thickness in the R-corner region of the weld seam of a battery cell, including a first inkjet printing unit (A) formed by a printhead (1) for inkjet printing and a top clamp, wherein the printhead includes a plurality of nozzles (101).

[0045] The top clamp is used to clamp the battery cell (3), including a first clamping component (201) and a second clamping component (202). The first clamping component (201) contacts the first end face of the battery cell (3), and the second clamping component (202) contacts the second end face of the battery cell (3). There is a weld R-corner area between the second end face and the side face (301) of the battery cell.

[0046] Both the first clamping component (201) and the second clamping component (202) are provided with a rotating shaft (203);

[0047] The second clamping component (202) is also provided with a first cooling unit (204);

[0048] In the first inkjet printing unit (A), the nozzle (101) faces the side of the cell (301).

[0049] Before UV printing, a cooling unit is installed in the weld radius (R-corner) area of ​​the fixture where the battery cell is placed. Before each inkjet print, once the battery cell is confirmed to be placed in the designated position on the fixture, the cooling unit is activated, rapidly cooling the designated area of ​​the battery cell to, for example, 0-5°C. The viscosity of the UV coating sprayed from the printhead increases instantaneously upon contact with the designated area of ​​the housing, reducing its fluidity and increasing ink adhesion. After one print, a UV pre-curing process is performed, forming a "wet film" on the housing surface. At this point, the fluidity of the low-viscosity UV coating on the low-temperature "wet film" surface is further reduced, and ink adhesion increases significantly. Subsequent printing and final curing processes are then performed, thereby improving the film thickness reduction problem caused by the weld radius (R-corner) area.

[0050] This invention, in the UV inkjet printing process, without altering the UV inkjet printing technology and UV coating, takes advantage of the characteristic that the viscosity of UV coatings changes significantly with temperature. Figure 1 The viscosity trend of the UV coating with temperature shown in the figure demonstrates that by simply adding a cooling unit to the inside of the fixture to reduce the temperature of the R-corner area of ​​the laser welding seam at the cell splicing surface, the problem of film thickness reduction in the R-corner area of ​​the weld seam is significantly improved, while the film thickness uniformity in this area is also improved.

[0051] Rotating shafts are set at both ends of the top clamp. The rotation of the rotating shafts drives the rotation of the side of the battery cell (301) so that the printhead can perform inkjet printing on the complete side of the battery cell (301).

[0052] Furthermore, the first end face is the non-welded end face (302) of the battery cell, and the second end face is the welded end face (303) of the battery cell.

[0053] The weld radius (R-corner) area generally appears between the side (301) of the battery cell and the welding end face (303) of the battery cell. Therefore, when the first inkjet printing unit (A) mainly prints ink onto the side (301) of the battery cell, the first cooling unit (204) cools down the weld radius (R-corner) area of ​​the side (301) of the battery cell close to the welding end face (303) of the battery cell. The viscosity of the UV coating in this part increases, thereby solving the problem of reduced ink coverage in this part of the weld radius (R-corner) area.

[0054] Furthermore, the second clamping component (202) is also provided with a first position sensor (205).

[0055] The first position sensor (205) is mainly used to detect whether the battery cell has been positioned on the top clamp. If the top clamp is detected to have positioned the battery cell, the first cooling unit (204) is turned on to perform inkjet printing on the side (301) of the battery cell.

[0056] Furthermore, the first cooling unit (204) is disposed inside the second clamping component (202).

[0057] The first cooling unit (204) is integrated inside the second clamping component (202), improving the integration of the device, and

[0058] See Figure 3 Furthermore, the shape of the outer side of the second clamping member (202) is adapted to the cross-sectional shape of the side of the battery cell (301);

[0059] The first cooling unit (204) is an annular shape formed along the outer side region near the second clamping member (202).

[0060] The shape of the bottom surface of the second clamping component (202) is adapted to the shape of the welding end face (303) of the battery cell.

[0061] For example, if the battery cell is cylindrical, with a cylindrical side surface (301) and a circular welding end face (303), then the outer side surface of the second clamping member (202) is also cylindrical, and the bottom surface of the second clamping member (202) is a circle that matches the shape of the welding end face (303) of the battery cell. The diameter of the outer side surface of the second clamping member (202) can be slightly smaller than the diameter of the side surface (301) of the battery cell, and the first cooling unit (204) is an annulus formed along the area near the outer side surface of the second clamping member (202).

[0062] Furthermore, the first cooling unit (204) is located close to the bottom surface of the second clamping component (202). In this way, the first cooling unit (204) is close to the weld R-corner area formed between the side of the battery cell and the welding end face (303) of the battery cell, which can better cool the weld R-corner area quickly. When the nozzle sprays UV coating, the lower temperature of the weld R-corner area reduces the viscosity of the UV coating in that area, thus solving the problem of thinner ink coating.

[0063] For example, the battery cell can be a square battery cell. The side of the square battery cell is a cuboid shape. Then the welding end face (303) of the battery cell is a rectangle. The outer side of the second clamping component (202) is also a rectangle, and the bottom surface is a rectangle that matches the shape of the welding end face (303) of the battery cell.

[0064] Furthermore, the first cooling unit (204) is located close to the bottom surface of the second clamping component (202). In this way, the first cooling unit (204) is close to the weld R-corner area formed between the side of the battery cell and the welding end face (303) of the battery cell, which is beneficial for cooling the weld R-corner area.

[0065] Specifically, the outer side of the second clamping component (202) is smaller than the side of the battery cell, so that the first position sensor is installed on the outer side of the second clamping component (202) to facilitate detection of whether the battery cell (3) is installed in place.

[0066] See Figure 4 Furthermore, it includes a second inkjet printing unit (B) formed by a printhead (1), a battery cell side clamp (4), and a support base (5);

[0067] The support base (5) is used to support one end of the non-welded end face (302) of the battery cell (3);

[0068] The cell side clamp (4) is used to clamp the area on the cell side (301) that is close to the welding end face (303) of the cell;

[0069] A second cooling unit (401) is provided on the side clamp (4) of the battery cell;

[0070] In the second inkjet printing unit (B), the nozzle (101) faces the welding end face (303) of the cell (3).

[0071] The weld radius (R-corner) area generally appears between the side (301) and the welding end face (303) of the battery cell. Therefore, when the second inkjet printing unit (B) prints ink onto the welding end face (303) of the battery cell, the second cooling unit cools down the weld radius (R-corner) area on the welding end face (303) of the battery cell that is close to the side (301) of the battery cell. The viscosity of the UV coating in this area increases, thereby solving the problem of reduced ink coverage in this weld radius (R-corner) area.

[0072] When inkjet printing is performed on the welding end face (303) of the battery cell, the battery cell side clamp (4) clamps the side face (301) of the battery cell so that the welding end face (303) of the battery cell faces the printhead.

[0073] Specifically, the support base (5) has grooves that fit the non-welded end face (302) of the battery cell and a portion of the battery cell side surface near the non-welded end face (302). The non-welded end face (302) of the battery cell and this portion of the battery cell side surface (301) near the non-welded end face (302) of the battery cell are inserted into the grooves to support the battery cell.

[0074] Furthermore, a second position sensor (402) is also provided on the side clamp (4) of the battery cell.

[0075] The second position sensor (402) is mainly used to detect whether the battery cell has been positioned on the side clamp of the battery cell. If the side clamp (4) of the battery cell is detected to have positioned the battery cell, the second cooling unit (401) is turned on to heat the welding end face (303) of the battery cell.

[0076] Furthermore, the second cooling unit (401) is disposed inside the battery cell side clamp (4).

[0077] See Figure 5 Furthermore, the shape of the inner side of the cell side clamp (4) is adapted to the cross-sectional shape of the cell side (301);

[0078] The second cooling unit (401) is a ring formed along the inner side region of the clamp (4) near the side of the battery cell.

[0079] Specifically, the cell side clamp (4) has an upper end face and a lower end face. The upper end face of the cell side clamp (4) faces the welding end face (303) of the cell, and the lower end face of the cell side clamp (4) faces the non-welding end face (302) of the cell. A second position sensor (402) is provided in the area between the upper end face of the cell side clamp (4) and the outer side face of the cell side clamp (4) to facilitate detection of whether the cell is installed in place.

[0080] For example, if the battery cell is cylindrical and the side surface (302) of the battery cell is cylindrical, then the inner surface of the second clamping component (202) is also cylindrical, which facilitates clamping and positioning of the battery cell. The second cooling unit (401) is a ring formed along the inner surface area of ​​the clamp near the side of the battery cell. Further, the second cooling unit (401) is located near the upper end face of the clamp near the side of the battery cell. In this way, the second cooling unit (401) is close to the weld R-corner area formed between the side of the battery cell and the welding end face (303) of the battery cell, allowing for better rapid cooling of the weld R-corner area. When the nozzle sprays UV coating, the lower temperature of the weld R-corner area reduces the viscosity of the UV coating in that area, solving the problem of thinner ink coating.

[0081] For example, the battery cell can be a square battery cell, the sides of which are rectangular, and the inner side of the battery cell side clamp is also rectangular.

[0082] Furthermore, the second cooling unit (401) is located near the upper end face of the cell side clamp (4). This allows the second cooling unit (401) to be close to the weld radius (R-corner) area formed between the cell side face (301) and the cell's welding end face (303), which is beneficial for cooling the weld radius area. Additionally, the cell (3) is either a cylindrical cell or a square cell.

[0083] This invention is not only applicable to cylindrical cells, but also to other types of cells that have the same problem of film thickness reduction in the weld R-corner area after laser welding, such as square cells.

[0084] Specifically, the battery cells are lithium-ion batteries.

[0085] This paper details a solution to the problem of film thickness reduction in the radius (R) region of the weld after laser welding, using the side of a cylindrical battery cell as an example. (See also...) Figure 6Specifically, the area of ​​the battery cell to be coated is roughened using a roughening process. After surface cleaning, the roughened area is ready for the UV inkjet printing process. Before starting the first inkjet printing, the battery cell is placed in the top clamp and positioned. At this time, the position sensor on the top clamp receives the signal indicating the battery cell's positioning and automatically activates the first cooling unit located in the second clamping component to reduce the temperature of the weld radius area. The cylindrical area of ​​the battery cell undergoes inkjet printing and UV pre-curing of the coating. The liquid coating forms an incompletely cured "wet film" on the shell surface. At this point, the fluidity of the low-viscosity UV coating on the low-temperature "wet film" surface is further reduced, and the amount of ink adhering to the coating increases significantly. The inkjet printing and UV pre-curing processes are repeated until the required film thickness is met. Then, subsequent inkjet printing and UV final curing processes are performed. After completion, the first cooling unit in the top clamp is turned off, and the battery cell is finished with UV inkjet printing and removed from the production line.

[0086] Specifically, the printhead is a piezoelectric ceramic printhead with multiple neatly arranged nozzles. The opening and closing of the piezoelectric ceramic nozzles can be controlled by the inkjet printing area set by software, thereby performing inkjet printing on the corresponding area to be coated. Figure 2 The inkjet printer can perform inkjet printing on the side of the battery cell cylinder by rotating the shaft to match the printhead. Figure 4 The battery cell is fixed in the support base (5) and the battery cell side clamp (4). After positioning, the printhead can be matched to perform inkjet printing on the welding end face (303) of the battery cell. Specifically, the regional cooling capacity of the first cooling unit (204) and the second cooling unit (401) is 0.3℃ / s to 1.5℃ / s. Before the start of production each day, the first and second cooling units need to be manually turned on in advance to pre-cool the designated area of ​​the clamp to the required process temperature.

[0087] Specifically, the dew point of the UV inkjet printing environment is -30 to 10°C, preferably -30°C.

[0088] Specifically, in the UV inkjet printing process, depending on the required film thickness, equipment capacity, and coating parameters, the following options can be selected: "multiple inkjet printing plus multiple coating UV pre-curing → final coating UV curing" or "single inkjet printing → single coating UV pre-curing → final coating UV curing". Preferably, the multiple inkjet printing option is used.

[0089] Application Examples

[0090] The test cell was a cylindrical steel-cased cell with a diameter of 46 mm and a height of 120 mm. The negative end face of the cell was the welding end face. The coating thickness was 100±10 μm. The UV inkjet printing area was the side of the cell cylinder and the negative end face of the cell. The number of inkjet printing and UV curing times was 3, that is, the scheme of "3 inkjet printing plus 3 UV pre-curing of coating → UV final curing of coating" was adopted.

[0091] As a comparative example: the cooling unit corresponding to the shielding fixture starts the inkjet printing program to complete the UV inkjet printing task of the designated area of ​​the battery cell.

[0092] As an example: start the cooling unit startup program corresponding to the fixture, and keep the remaining processes the same as the comparative example, and complete the UV inkjet printing task of the designated area of ​​the battery cell according to the aforementioned scheme.

[0093] The inkjet printing results are shown in Table 1.

[0094] Table 1: Film thickness distribution in different regions after UV inkjet printing of battery cells using different schemes

[0095]

[0096] As can be seen from Table 1, in the embodiment using the cooling unit of this optimized device, there is no significant difference between the film thickness on the cylindrical side of the battery cell and the film thickness on the negative end side and the comparative embodiment without the cooling unit.

[0097] In the embodiment using the cooling unit of this optimized device, the film thickness in the weld R-corner region after optimization by the cooling unit is 95±10μm, while the film thickness in the comparative example without the cooling unit is only 40±15μm.

[0098] Compared to the cylindrical side and negative end face, the film thickness in the weld radius (R-corner) region of the comparative example without the cooling unit only reaches 40% of that of the original, and the fluctuation range is relatively large. The embodiment using the cooling unit of this optimized device, however, can reach 95% of the original thickness, and the fluctuation range is relatively smaller. This demonstrates that cooling only the weld radius (R-corner) region not only has no significant impact on the film thickness in the non-functional area, but also greatly improves the film thickness reduction problem in the weld radius (R-corner) region, while simultaneously improving the film thickness uniformity in this region.

[0099] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An inkjet printing device for improving film thickness in the radius (R) region of a battery cell weld seam, characterized in that, It includes a first inkjet printing unit formed by a printhead for inkjet printing and an upper clamp, the printhead including a plurality of nozzles; The top clamp is used to clamp the battery cell and includes a first clamping component and a second clamping component. The first clamping component contacts a first end face of the battery cell, and the second clamping component contacts a second end face of the battery cell. The weld R-corner area exists between the second end face and the side of the battery cell. Both the first clamping component and the second clamping component are provided with a rotating shaft; The second clamping component is also provided with a first cooling unit; In the first inkjet printing unit, the nozzle faces the side of the battery cell.

2. The inkjet printing device for improving the film thickness in the R-corner region of the cell weld seam as described in claim 1, characterized in that, The first end face is the non-welded end face of the battery cell, and the second end face is the welded end face of the battery cell.

3. The inkjet printing device for improving the film thickness in the R-corner region of the cell weld seam as described in claim 1, characterized in that, The second clamping component is also equipped with a first position sensor.

4. The inkjet printing device for improving the film thickness in the R-corner region of the cell weld seam as described in claim 1, characterized in that, The first cooling unit is disposed inside the second clamping component.

5. The inkjet printing device for improving the film thickness in the R-corner region of the cell weld seam as described in claim 4, characterized in that, The shape of the outer side of the second clamping component is adapted to the cross-sectional shape of the side of the battery cell; The first cooling unit is a ring formed along the outer side region near the second clamping component.

6. The inkjet printing device for improving the film thickness in the R-corner region of the cell weld seam as described in claim 1, characterized in that, It includes a second inkjet printing unit formed by the printhead, the battery cell side clamp, and the support base; The support base is used to support one end of the non-welded end face of the battery cell; The cell side clamp is used to clamp the area on the side of the cell that is close to the welding end face of the cell; A second cooling unit is provided on the side clamp of the battery cell; In the second inkjet printing unit, the nozzle faces the welding end face of the battery cell.

7. The inkjet printing device for improving the film thickness in the R-corner region of the cell weld seam as described in claim 6, characterized in that, A second position sensor is also provided on the side clamp of the battery cell.

8. The inkjet printing device for improving the film thickness in the R-corner region of the cell weld seam as described in claim 6, characterized in that, The second cooling unit is disposed inside the side clamp of the battery cell.

9. The inkjet printing device for improving the film thickness in the R-corner region of the cell weld seam as described in claim 6, characterized in that, The shape of the inner side of the battery cell side clamp is adapted to the cross-sectional shape of the battery cell side. The second cooling unit is a ring formed along the inner side region of the clamp near the side of the battery cell.

10. The inkjet printing device for improving the film thickness in the R-corner region of the cell weld seam as described in claim 1, characterized in that, The battery cell is either a cylindrical cell or a square cell.

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