Coating die for high solids lithium battery slurry

Abstract

The application provides a coating die for high solid lithium battery slurry, which comprises an upper die, a lower die and a gasket, a feeding channel is arranged in the middle of the bottom surface of the rear side of the upper die and the middle of the top surface of the rear side of the lower die, the bottom surface of the upper die and the top surface of the lower die extend to the left and right sides at the front end of the feeding channel to form main flow channels, a flat transition flow channel is arranged in the area in front of the main flow channels on the top surface of the lower die, a buffer flow channel is arranged on the front side of the flat transition flow channel, a material extrusion channel is formed between the upper die and the lower die in front of the buffer flow channel, a deformation groove and a fine adjustment screw mounting hole are arranged at the front end of the upper die, and the fine adjustment screw is threadedly connected to the front end of the upper die after passing through the fine adjustment screw mounting hole and the deformation groove; a back plate is connected to the rear side of the upper die and the lower die, and a push die screw and a pull die screw are connected to the back plate to control the distance of the forward and backward movement of the upper die relative to the lower die. The application realizes uniform and stable coating through the fine adjustment of the opening gap of the die lip and the internal cavity change structure of multiple stages.

Description

Technical Field

[0001] This invention relates to the field of coating die technology, and in particular to a coating die for high-solids-content lithium battery slurry. Background Technology

[0002] Lithium-ion battery coating dies are now widely used in the manufacturing of lithium-ion batteries for electric vehicles. The industry's continued growth has placed higher demands on the range of electric vehicles. Besides addressing external factors affecting range, it's also necessary to improve the performance of the lithium-ion batteries themselves. Typically, the solid content of lithium-ion battery slurry during coating is below 70%, resulting in a low proportion of active materials. If the solid content exceeds 70%, the slurry becomes more viscous, making it impossible for conventional coating dies to achieve a uniform and stable coating effect. Summary of the Invention

[0003] To address the aforementioned problems, this invention aims to provide a coating die for high-solids-content lithium battery slurry, which achieves uniform and stable coating by finely adjusting the die lip opening gap and the internal cavity variation structure in multiple stages.

[0004] The technical solution of this invention is a coating die head for high-solids lithium battery slurry, comprising an upper die, a lower die, and a spacer located between them. The upper die and the lower die are fixed by locking screws. The invention is characterized by: a feeding channel being provided in the middle of the rear bottom surface of the upper die and the middle of the rear top surface of the lower die; main channels extending to the left and right sides from the front end of the feeding channels on the bottom surface of the upper die and the top surface of the lower die; a planar transition channel being provided in the area in front of the main channel on the top surface of the lower die; a buffer channel being provided in front of the planar transition channel; and an upper... A material extrusion channel is formed between the upper and lower dies under the guidance of a gasket. The front end of the upper die is provided with a deformation groove that runs through the upper die along the width direction. A series of fine-tuning screw mounting holes are arranged along the width direction at the front of the upper die. The fine-tuning screws pass through the fine-tuning screw mounting holes and the deformation groove and are threaded to the front end of the upper die. A back plate is connected to the rear side of the upper and lower dies. The back plate is fixed to the lower die with screws. Push die screws and pull die screws are connected between the back plate and the upper die. The push die screws and pull die screws control the distance that the upper die moves back and forth relative to the lower die.

[0005] Preferably, the upper and lower molds are provided with multiple thermostatic liquid channels that avoid the flow channel positions, and the two ends of the thermostatic liquid channels are connected to thermostatic liquid flow components.

[0006] Preferably, the cross-sections of the main channel and the feed channel form a Y-shaped channel.

[0007] Preferably, the thermostatic liquid flow assembly includes a tapered tee, a right-angle connector, a flow pipe, and a temperature sensor.

[0008] Preferably, the back of the upper mold and the lower mold are respectively connected to hinge blocks, and a long lever is connected to the hinge block of the upper mold. After removing the mold locking screw, the long lever is operated to make the upper mold flip open relative to the lower mold along the hinge block.

[0009] Preferably, the feed channel is connected to an external screw extruder for direct extrusion feeding.

[0010] Preferably, the depth of the buffer channel gradually increases from back to front, and the cross-section of the buffer channel in the front region has a teardrop shape from back to front.

[0011] Preferably, the back plate is provided with four screws. The two lower screws fix the back plate to the lower mold. One of the two upper screws is threaded and passes through the threaded hole of the back plate, and its front end abuts against the rear side of the upper mold to become a push mold screw. The other screw passes through the light hole of the back plate and is threaded and connected to the threaded hole on the rear side of the upper mold to become a pull mold screw.

[0012] Preferably, a spacer is provided between the back plate and the upper mold to control the relative distance between them.

[0013] This invention achieves uniform and stable coating by finely adjusting the opening gap of the mold lip and the internal cavity change structure in multiple stages, which can effectively meet the coating requirements when the solid content in the lithium battery slurry is higher than 70%. Attached Figure Description

[0014] Figure 1 This is a structural schematic diagram of the invention from a rear view. Figure 2 This is a schematic diagram of the structure from the front view of the present invention; Figure 3 This is an exploded view of the upper mold, gasket, and lower mold of the present invention; Figure 4 for Figure 3 A structural diagram from another perspective; Figure 5 This is a cross-sectional view of the internal structure of the present invention; Figure 6 This is a schematic diagram of the back plate structure in this invention; Figure 7 for Figure 6 Exploded view; Figure 8 for Figure 6 Schematic diagram of the structure after installing the spacer pads; Figure 9 for Figure 8 Exploded view; Wherein: 1—Upper mold; 2—Lower mold; 3—Shim; 4—Mold locking screw; 5—Feed channel; 6—Main channel; 7—Plane transition channel; 8—Buffer channel; 9—Material extrusion channel; 10—Deformation groove; 11—Fine-adjustment screw mounting hole; 12—Back plate; 13—Push mold screw; 14—Pull mold screw; 15—Thermostatic liquid flow assembly; 151—Conical tee; 152—Right angle connector; 153—Flow pipe; 16—Hinge block; 17—Long lever; 18—Distance shim; 19—Fine-adjustment screw. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the accompanying drawings.

[0016] like Figures 1 to 5 As shown, this invention provides a coating die head for high-solids-content lithium battery slurry, including an upper die 1, a lower die 2, and a spacer 3 located between them. The upper die 1 and the lower die 2 are fixed by locking screws 4. The invention is characterized in that: a feeding channel 5 is provided in the middle of the rear bottom surface of the upper die 1 and the middle of the rear top surface of the lower die 2; a main channel 6 extends to the left and right sides from the front end of the feeding channel 5 on the bottom surface of the upper die 1 and the top surface of the lower die 2; a planar transition channel 7 is provided in the area in front of the main channel 6 on the top surface of the lower die 2; a buffer channel 8 is provided in front of the planar transition channel 7; and a spacer 3 is provided between the upper die 1 and the lower die 2 in front of the buffer channel 8. Under the guidance of the gasket 3, a material extrusion channel 9 is formed. The front end of the upper die 1 is provided with a deformation groove 10 that runs through the upper die 1 along the width direction. A series of fine-tuning screw mounting holes 11 are arranged along the width direction at the front part of the upper die 1. The fine-tuning screw 19 passes through the fine-tuning screw mounting holes 11 and the deformation groove 10 and is threaded to the front end of the upper die 1. The rear sides of the upper die 1 and the lower die 2 are connected to a back plate 12. The back plate 12 is fixed to the lower die 2 by screws. The back plate 12 and the upper die 1 are connected by a push die screw 13 and a pull die screw 14. The push die screw 13 and the pull die screw 14 control the distance that the upper die 1 moves back and forth relative to the lower die 2.

[0017] Specifically, the upper mold 1 and the lower mold 2 are provided with multiple constant temperature liquid channels that avoid the flow channel position along the width direction, and the two ends of the constant temperature liquid channels are connected to constant temperature liquid flow components 15.

[0018] Specifically, the cross-sections of the main channel 6 and the feed channel 5 form a Y-shaped channel.

[0019] Specifically, the thermostatic liquid flow assembly 15 includes a tapered tee 151, a right-angle connector 152, a flow pipe 153, and a temperature sensor.

[0020] Specifically, the back of the upper mold 1 and the lower mold 2 are respectively connected to hinge blocks 16. The hinge block 16 of the upper mold 1 is connected to a long lever 17. After removing the locking screw 4, the long lever 17 is operated to make the upper mold 1 flip open relative to the lower mold 2 along the hinge block 16.

[0021] Specifically, the feed channel 5 is connected to an external screw extruder for direct extrusion feeding.

[0022] Specifically, the depth of the buffer channel 8 gradually increases from back to front, and the cross-section of the buffer channel 8 in the front region has a teardrop shape from back to front.

[0023] Specifically, such as Figures 6 to 9 As shown, the back plate 12 is provided with four screws. The two lower screws fix the back plate 12 to the lower mold 2. One of the two upper screws is threaded and passes through the threaded hole of the back plate 12, and its front end abuts against the rear side of the upper mold 1 to become a push mold screw 13. The other screw passes through the light hole of the back plate 12 and is threaded and connected to the threaded hole on the rear side of the upper mold 1 to become a pull mold screw 14.

[0024] Furthermore, a spacer 18 is provided between the back plate 12 and the upper mold 1 to control the relative distance between them.

[0025] In this invention, the slurry is directly extruded from the screw extruder into the feed channel 5, then into the main channel 6, and forward into the planar transition channel 7. After passing through the planar transition channel 7, it enters the buffer channel 8 in front, which buffers the slurry pressure. After passing over the top surface of the buffer channel 8, the slurry flows forward into the material extrusion channel 9. Under the guidance of the gasket 3, it is uniformly extruded along the material extrusion channel 9 for coating. During this process, if the slurry coating thickness does not meet the requirements at different width positions, the fine-tuning screw 19 at that location is adjusted accordingly to pull the upper die 1 on the front side of the deformation groove 10 upward along the axial direction, or to push the upper die 1 on the front side of the deformation groove 10 downward along the axial direction. This causes the die lip of the upper die 1 to deform upward or downward, thereby adjusting the gap of the material extrusion channel 9 in that area, and finally achieving uniform and stable coating.

[0026] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Any simple modifications, equivalent changes, or alterations made to the above embodiments based on the technical principles of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A coating die head for high-solids lithium battery slurry, comprising an upper die (1), a lower die (2), and a spacer (3) located between the two, wherein the upper die (1) and the lower die (2) are fixed by a locking screw (4), characterized in that: Feed channels (5) are provided in the middle of the bottom rear side of the upper die (1) and the middle of the top rear side of the lower die (2). Main channels (6) extend to the left and right sides from the bottom surface of the upper die (1) and the top surface of the lower die (2) at the front end of the feed channels (5). A planar transition channel (7) is provided in the area in front of the main channel (6) on the top surface of the lower die (2). A buffer channel (8) is provided in front of the planar transition channel (7). A material extrusion channel (9) is formed between the upper die (1) and the lower die (2) in front of the buffer channel (8) under the guidance of the gasket (3). A through-hole is provided at the front end of the upper die (1) along the width direction. Deformation groove (10), the front part of the upper mold (1) has a series of fine adjustment screw mounting holes (11) arranged along the width direction, the fine adjustment screw (19) passes through the fine adjustment screw mounting holes (11) and the deformation groove (10) and is threaded to the front end of the upper mold (1); the rear side of the upper mold (1) and the lower mold (2) is connected to a back plate (12), the back plate (12) is fixed to the lower mold (2) by screws, the back plate (12) and the upper mold (1) are connected by a push mold screw (13) and a pull mold screw (14), the push mold screw (13) and the pull mold screw (14) control the distance of the upper mold (1) moving back and forth relative to the lower mold (2).

2. The coating die head for high-solids-content lithium battery slurry according to claim 1, characterized in that: Multiple thermostatic liquid channels that avoid the flow channel position are provided through the upper mold (1) and lower mold (2) along the width direction. The two ends of the thermostatic liquid channels are connected to thermostatic liquid flow components (15).

3. The coating die head for high-solids-content lithium battery slurry according to claim 1, characterized in that: The cross-sections of the main channel (6) and the feed channel (5) form a Y-shaped channel.

4. A coating die for high-solids-content lithium battery slurry according to claim 1, characterized in that: The thermostatic liquid flow assembly (15) includes a tapered tee (151), a right-angle connector (152), a flow pipe (153), and a temperature sensor.

5. A coating die for high-solids-content lithium battery slurry according to claim 1, characterized in that: The back of the upper mold (1) and the lower mold (2) are respectively connected to hinge blocks (16). A long lever (17) is connected to the hinge block (16) of the upper mold (1). After removing the locking screw (4), the long lever (17) is operated to make the upper mold (1) flip open relative to the lower mold (2) along the hinge block (16).

6. A coating die for high-solids-content lithium battery slurry according to claim 1, characterized in that: The feed channel (5) is connected to an external screw extruder for direct extrusion feeding.

7. A coating die for high-solids-content lithium battery slurry according to claim 1, characterized in that: The depth of the buffer channel (8) gradually increases from back to front, and the cross-section of the buffer channel (8) in the front region has a teardrop shape from back to front.

8. A coating die for high-solids-content lithium battery slurry according to claim 1, characterized in that: The back plate (12) is provided with four screws. The two screws at the bottom fix the back plate (12) to the lower mold (2). One of the two screws at the top is threaded and passes through the threaded hole of the back plate (12), and its front end abuts against the rear side of the upper mold (1) to become a push mold screw (13). The other screw passes through the light hole of the back plate (12) and is threaded and connected to the threaded hole on the rear side of the upper mold (1) to become a pull mold screw (14).

9. A coating die for high-solids-content lithium battery slurry according to claim 1, characterized in that: A spacer (18) is provided between the back plate (12) and the upper mold (1) to control the relative distance between them.

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