Lithium ion battery ceramic slurry coating and drying mechanism and anode coating system thereof

Abstract

The utility model belongs to the technical field of lithium ion battery manufacturing, and particularly relates to a lithium ion battery ceramic slurry coating and drying mechanism and a positive electrode coating system thereof, which are arranged in the positive electrode coating system and comprise a support, a ceramic slurry coating head, a screw pump, a ceramic slurry storage tank and a position adjusting mechanism, the ceramic slurry coating head is installed on the support through a position adjusting mechanism, and the screw pump conveys ceramic slurry in the ceramic slurry storage tank into the ceramic slurry coating head through a pipeline. According to the utility model, the boundary of the material area and the ceramic area is clear after the positive electrode is coated, the abnormal phenomena such as material mixing are avoided, the production debugging of the coating process is convenient, defective products are reduced, the production efficiency and the yield are improved, the judgment of the boundary of the ceramic and the material area in the subsequent process is convenient, and the safety accident caused by poor coating of the positive electrode and the negative electrode of the battery is prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium ion battery manufacturing, and specifically relates to a lithium ion battery ceramic slurry coating and drying mechanism and a positive electrode coating system thereof. Background Art

[0002] Lithium-ion batteries have the advantages of high voltage, high specific energy, many cycles and long storage time. They are not only widely used in portable electronic devices such as mobile phones, digital cameras and laptops, but also widely used in large and medium-sized electric equipment such as electric vehicles, electric bicycles and power tools. Therefore, the safety requirements for lithium-ion batteries are getting higher and higher.

[0003] The positive electrode coating process is one of the most important processes in the production and manufacturing of lithium-ion batteries. This process uses a coating machine to evenly coat the positive electrode slurry 100 and the ceramic slurry 200 with a certain solid content on the foil and dry it to form a positive electrode sheet with a certain material area width and surface density, ceramic width and thickness. The positive electrode sheet material area and the ceramic area must be clearly defined, such as Figure 6 shown.

[0004] Existing technologies such as Figure 7 As shown, the process is as follows: the foil 300 is unwound through the unwinding shaft 400 → the positive electrode slurry and the ceramic slurry are simultaneously ejected from different flow channels of the same die head 500, and the two slurries are uniformly coated on the surface of the foil at the same time to form a wet film electrode → the wet film electrode passes through the oven 600, and the hot air in the oven dries the electrode → the dry film electrode is wound at the winding shaft 700, and this process is completed.

[0005] The coated positive electrode sheet has two areas: the material area and the ceramic area. The material area is composed of active substances, which provide the energy required for the lithium battery to charge and discharge, and participate in the formation reaction during the charging and discharging process; the ceramic area plays an insulating role to prevent the battery from having safety accidents under abnormal conditions, and does not participate in the reaction during the charging and discharging process. Due to the different functions of the two areas, each area has a width requirement, and the two areas need to be clearly demarcated, such as Figure 6 shown.

[0006] In the actual production process, the two slurries will flow out of their own flow channels in the die head, causing the two slurries to mix together and ceramics to appear in the material area, such as Figure 8 As shown in the figure, two slurries are fed by different screw pumps. When the two pump speeds do not match, a wave edge phenomenon will appear at the junction, such as Fig. 9 As shown in the figure, the boundary between the two slurries is clear after they leave the die head, but at this time both slurries are in a liquid state. They have a certain fluidity before drying. After drying, a gray area will appear at the junction, as shown in the figure. Fig.10 shown. Utility Model Content

[0007] The utility model aims to provide a lithium-ion battery ceramic slurry coating and drying mechanism and a positive electrode coating system thereof, so as to solve the problem of mixing materials in different material areas in the prior art.

[0008] To achieve the above purpose, the utility model provides the following technical solutions: a lithium-ion battery ceramic slurry coating mechanism, installed in the positive electrode coating system, including a bracket, a ceramic slurry coating head, a screw pump, a ceramic slurry storage tank and a position adjustment mechanism, the ceramic slurry coating head is installed on the bracket through the position adjustment mechanism, and the screw pump transports the ceramic slurry in the ceramic slurry storage tank to the ceramic slurry coating head through a pipeline. By coating the ceramic slurry on the positive electrode sheet alone through the ceramic slurry coating head, it can be ensured that the material area and the ceramic area are clearly demarcated after the positive electrode is coated, and there is no abnormal phenomenon such as mixing.

[0009] Preferably, the position adjustment mechanism comprises a guide rod, a slider and a support block, wherein the support blocks are two and are fixed on both sides of the bracket, the guide rod is fixed between the two support blocks, the slider is slidably connected to the guide rod, and the ceramic slurry coating head is mounted on the slider. The position adjustment mechanism can adjust the left and right position of the ceramic slurry coating head, that is, the position of the ceramic slurry on both sides of the pole piece.

[0010] Preferably, a guide rail is provided on the side of the slider in the vertical direction, a clamp is connected to the sliding rod on the guide rail, and the ceramic slurry coating head is installed on the clamp. The clamp and the guide rail can control the upper and lower positions of the ceramic slurry coating head, that is, the distance between the head and the pole piece.

[0011] Preferably, the sliding blocks are in two sets, and two sets of the ceramic slurry coating heads are correspondingly mounted thereon.

[0012] Preferably, the clamping block and the sliding block are respectively provided with a fastening switch to lock and fix the clamping block and the sliding block.

[0013] The utility model also discloses a lithium-ion battery ceramic slurry drying mechanism, which is installed in the positive electrode coating system, including a left gantry, a right gantry, a lamp tube and a lamp tube adjustment mechanism for adjusting the position of the lamp tube, and a set of lamp tube adjustment mechanisms are installed on the left gantry and the right gantry, and the lamp tube is installed between the left gantry and the right gantry through the lamp tube adjustment mechanism. The ceramic slurry is dried separately by the drying mechanism, which can ensure that the material area and the ceramic area are clearly demarcated after the positive electrode coating, and there is no abnormal phenomenon such as mixing of materials.

[0014] Preferably, the lamp tube adjustment mechanism comprises a left connecting block, a right connecting block, a left slider, a right slider and a connecting shaft, the left connecting block and the right connecting block are respectively mounted on the corresponding left gantry and right gantry, the connecting shaft is fixed between the left connecting block and the right connecting block, the left slider and the right slider are respectively slidably connected to the connecting shaft, and the two ends of the two groups of lamp tubes are respectively mounted on the left slider and the right slider on the same side. The lamp tube adjustment mechanism is used to align the left and right center positions of the lamp tubes with the center position of the ceramic area to ensure drying efficiency.

[0015] Preferably, a lampshade is installed on the upper part of the lamp tube to prevent the high temperature generated by the lamp tube from causing harm to the human body.

[0016] Preferably, the left slider and the right slider are respectively provided with sliding grooves in the vertical direction, and the two ends of the lamp tube and the lampshade are slidably connected to the sliding grooves through sliding plates. The distance between the lamp tube and the positive electrode plate can be adjusted through the sliding plates.

[0017] The utility model also discloses a lithium-ion battery positive electrode coating system, comprising the lithium-ion battery ceramic slurry coating mechanism, the lithium-ion battery ceramic slurry drying mechanism, an unwinding shaft, a positive electrode slurry spraying die head, an oven and a winding shaft, the foil is unwinded by the unwinding shaft and then enters the positive electrode slurry spraying die head, the positive electrode slurry is sprayed out by the positive electrode slurry spraying die head and coated on the surface of the foil to form a wet film electrode piece, the wet film electrode piece passes through the oven, the hot air in the oven dries the electrode piece and then enters the lithium-ion battery ceramic slurry coating mechanism, the ceramic slurry is sprayed out by the lithium-ion battery ceramic slurry coating mechanism and coated on the surface of the foil, then enters the lithium-ion battery ceramic slurry drying mechanism, the ceramic slurry is dried, and finally the dry film electrode piece is wound up at the winding shaft. The coating system changes the positive electrode coating process, and changes it to coating the ceramic slurry after the positive electrode slurry coating is completed and dried, and the ceramic slurry is dried by high-temperature lamps. This can ensure that the material area and the ceramic area are clearly demarcated after the positive electrode coating, and there is no abnormal phenomenon such as mixing.

[0018] The beneficial effects of the utility model are as follows: compared with the prior art, the patent can ensure that the material area and the ceramic area are clearly defined after the positive electrode is coated, without abnormal phenomena such as mixing of materials, which is convenient for production debugging of the coating process and reduces the generation of defective products, improves production efficiency and yield, and is convenient for the subsequent process to determine the boundary between the ceramic and material areas, thereby preventing safety accidents caused by poor coating of the positive and negative electrodes of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the positive electrode coating system of a lithium-ion battery in the utility model;

[0020] Figure 2 It is a structural schematic diagram of a ceramic slurry coating mechanism for lithium-ion batteries in the utility model;

[0021] Figure 3yes Figure 2 A schematic diagram of the structure of the middle position adjustment mechanism;

[0022] Figure 4 It is a structural schematic diagram of a lithium-ion battery ceramic slurry drying mechanism in the utility model;

[0023] Figure 5 yes Figure 4 The enlarged view of point A in the middle;

[0024] Figure 6 It is a schematic diagram of the positive electrode sheet area and the ceramic area with clear boundaries;

[0025] Figure 7 It is a structural schematic diagram of a lithium-ion battery positive electrode coating system in the prior art;

[0026] Figure 8 It is a schematic diagram of the situation where ceramics appear in the positive electrode material area in the prior art;

[0027] Fig. 9 It is a schematic diagram of the wavy edge phenomenon at the junction of the positive electrode material area and the ceramic material area in the prior art;

[0028] Fig.10 It is a schematic diagram of a gray area appearing at the junction of the positive electrode material area and the ceramic material area in the prior art;

[0029] In the figure: 1. unwinding shaft; 2. positive electrode slurry spraying die head; 3. oven; 4. lithium-ion battery ceramic slurry coating mechanism; 41. bracket; 42. ceramic slurry coating head; 43. screw pump; 44. ceramic slurry storage tank; 45. position adjustment mechanism; 451. guide rod; 452. slider; 453. support block; 454. guide rail; 455. clamping block; 456. fastening switch; 5. lithium-ion battery ceramic slurry drying mechanism; 51. left gantry; 52. right gantry; 53. lamp tube; 54. lamp tube adjustment mechanism; 541. left connecting block; 542. right connecting block; 543. left slider; 544. right slider; 545. connecting shaft; 55. lamp cover; 56. slide groove; 57. slide plate; 6. rewinding shaft. DETAILED DESCRIPTION

[0030] The specific implementation of the utility model is described in detail below with reference to the accompanying drawings and preferred embodiments.

[0031] like Figure 1As shown, the utility model discloses a lithium ion battery positive electrode coating system, comprising an unwinding shaft 1, a positive electrode slurry spraying die head 2, an oven 3, a lithium ion battery ceramic slurry coating mechanism 4, a lithium ion battery ceramic slurry drying mechanism 5 and a winding shaft 6 which are arranged in sequence. Compared with the existing structure, this device divides the positive electrode slurry and ceramic slurry sprayed from the same die head in different flow channels into two processes, and changes it to spraying the positive electrode slurry first and then drying it, and then spraying the ceramic slurry and drying it. Specifically, the foil is unwound through the unwinding shaft and then enters the positive electrode slurry spraying die head. The positive electrode slurry is sprayed through the positive electrode slurry spraying die head and coated on the surface of the foil to form a wet film electrode piece. The wet film electrode piece passes through the oven, and the hot air in the oven dries the electrode piece and then enters the lithium-ion battery ceramic slurry coating mechanism. After the ceramic slurry is sprayed through the lithium-ion battery ceramic slurry coating mechanism and coated on the surface of the foil, it enters the lithium-ion battery ceramic slurry drying mechanism to dry the ceramic slurry, and finally the dry film electrode piece is rolled up at the reel. By adjusting the screw pump speed and the nozzle up and down moving device, the thickness and width of the ceramic area meet the process requirements. When the thickness is too large and the width is too large, reduce the pump speed and move the nozzle upwards; when the thickness is too large and the width is too small, reduce the pump speed and move the nozzle downwards; when the thickness is too small and the width is too large, increase the pump speed and move the nozzle upwards; when the thickness is too small and the width is too small, increase the pump speed and move the nozzle downwards. The coating system changes the positive electrode coating process, changing it to coating the ceramic slurry after the positive electrode slurry coating is completed and dried, and the ceramic slurry is dried by a high-temperature lamp, which can ensure that the material area and the ceramic area are clearly demarcated after the positive electrode coating, and there is no abnormal phenomenon such as mixing.

[0032] According to the above process, this system has improved the corresponding equipment, specifically, Figure 2 As shown, the lithium-ion battery ceramic slurry coating mechanism 4 includes a bracket 41, a ceramic slurry coating head 42, a screw pump 43, a ceramic slurry storage tank 44 and a position adjustment mechanism 45. The ceramic slurry coating head is installed on the bracket through the position adjustment mechanism, and the screw pump transports the ceramic slurry in the ceramic slurry storage tank to the ceramic slurry coating head through a pipeline. Among them, the position adjustment mechanism can adjust the position of the ceramic slurry coating head, and can adopt one of the mechanical positioning methods, universal adjusters, three-dimensional slide rail adjustment frame structures, etc. in the prior art. By coating the positive electrode sheet with ceramic slurry separately through the ceramic slurry coating head, it can be ensured that the material area and the ceramic area are clearly demarcated after the positive electrode is coated, and there is no abnormal phenomenon such as mixing.

[0033] Because the requirements of different models are different and the ceramic area is located at different positions on the foil, it is necessary to adjust the left and right positions of the two ceramic slurry coating heads. Figure 3As shown, the position adjustment mechanism 45 in the device includes a guide rod 451, a slider 452 and a support block 453. There are two support blocks, which are fixed on both sides of the bracket respectively. The guide rod is fixed between the two support blocks. The slider is slidably connected with the guide rod. Two sliders are used in the device. The ceramic slurry coating head is installed on the slider. By adjusting the position of the two sliders, the position of the two ceramic slurry coating heads is controlled. By adjusting the left and right positions of the ceramic slurry coating heads, that is, the positions of the ceramic slurry on both sides of the pole piece.

[0034] like Figure 3 As shown, in order to adjust the ceramic slurry coating head up and down and adjust the thickness and width of the ceramic area, a guide rail 454 is provided on the side of the slider in the vertical direction, and a clamping block 455 is connected to the sliding rod on the guide rail, and the ceramic slurry coating head is installed on the clamping block. The clamping block and the guide rail can control the up and down position of the ceramic slurry coating head, that is, the distance between the head and the pole piece, so that the thickness and width of the ceramic area can be controlled.

[0035] Furthermore, in order to position the clamp block and the slider, the clamp block and the slider are respectively provided with a tightening switch 456 to lock and fix the clamp block and the slider.

[0036] The principle of the above-mentioned lithium-ion battery ceramic slurry coating mechanism is as follows: the ceramic slurry is transported from the ceramic slurry buffer tank through the pipeline to the ceramic slurry nozzle under the action of the screw pump, and the slurry is sprayed from the nozzle to the surface of the foil. The thickness and width of the ceramic area can be adjusted by controlling the pump speed of the screw pump and adjusting the upper and lower positions of the clamping block. Due to the inconsistent requirements of different models of products, the position of the ceramic area on the foil is different, and the position of the ceramic area on the foil can be controlled by adjusting the position of the slider.

[0037] like Figure 4 As shown, the system also improves the drying mechanism. Specifically, the lithium-ion battery ceramic slurry drying mechanism includes a left gantry 51, a right gantry 52, a lamp tube 53 and a lamp tube adjustment mechanism 54 for adjusting the position of the lamp tube. A set of lamp tube adjustment mechanisms are installed on the left gantry and the right gantry respectively, and the lamp tube is installed between the left gantry and the right gantry through the lamp tube adjustment mechanism. By drying the ceramic slurry separately through the drying mechanism, it can be ensured that the material area and the ceramic area are clearly demarcated after the positive electrode is coated, and there is no abnormal phenomenon such as mixing. In the above structure, the structure of the lamp tube adjustment mechanism can also adopt one of the mechanical positioning methods, universal adjusters, three-dimensional slide rail adjustment frame structures, etc., or it can be a structure similar to the above position adjustment mechanism.

[0038] Specifically, the lamp tube adjustment mechanism 54 in the lithium-ion battery ceramic slurry drying mechanism includes a left connecting block 541, a right connecting block 542, a left slider 543, a right slider 544 and a connecting shaft 545. The left connecting block and the right connecting block are respectively installed on the corresponding left gantry and the right gantry. The structures of the left and right gantries are the same, and the components thereon are also the same. Specifically, the connecting shaft is fixed between the left connecting block and the right connecting block. There are two connecting shafts, which can prevent the left slider and the right slider from rotating. If it is a single connecting shaft, the cross-sectional shape of the connecting shaft needs to be set. For example, the cross-sectional shape of the connecting shaft is set to a triangle, a square or a polygon. This structure can prevent the left and right sliders from rotating on a single connecting shaft. The left slider and the right slider are respectively slidably connected to the connecting shaft, and the two ends of the two groups of lamp tubes are respectively installed on the left slider and the right slider on the same side. The lamp tube adjustment mechanism is used to align the left and right center positions of the lamp tubes with the center position of the ceramic area to ensure drying efficiency.

[0039] In order to prevent the high temperature generated by the lamp tube from causing harm to the human body, a lampshade 55 is installed on the upper part of the lamp tube.

[0040] like Figure 5 As shown, in order to enable the lamp tube and the lampshade to move up and down, the left and right sliders are respectively provided with slide grooves 56 in the vertical direction, and the two ends of the lamp tube and the lampshade are slidably connected to the slide grooves through slides 57. The distance between the lamp tube and the positive electrode sheet can be adjusted by the slide to ensure that the ceramic area is dried.

[0041] The principle of the above-mentioned lithium-ion battery ceramic slurry drying mechanism is as follows: the ceramic slurry coated on the foil is irradiated by the high temperature of the lamp tube, and the solvent evaporates and dries quickly to become a dry film. In order to prevent the high temperature generated by the lamp tube from causing harm to the human body, a protective cover needs to be installed outside the lamp tube, and the lamp tube adjustment mechanism can adjust the up and down, left and right positions of the lamp tube. The lamp tube uses an infrared carbon fiber heating tube, the temperature of the lamp tube is adjustable, the heating speed is fast, and the tube wall can instantly reach more than 500°C after power is turned on. When the heating tube is heated, the filament turns red, and there is no glaring light. The length of the heating tube can be adjusted according to the actual situation to ensure that the ceramic slurry is dried.

[0042] It should be pointed out that the device can be used to transport semi-finished lithium batteries, provide vacuum or inert gas according to requirements, and select different accessories for combination to make full use of space and improve work efficiency. For ordinary technicians in this technical field, without departing from the principle of the utility model, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the scope of protection of the utility model.

Claims

1. A lithium-ion battery ceramic slurry coating mechanism, characterized in that: It is installed in the positive electrode coating system, and includes a bracket, a ceramic slurry coating head, a screw pump, a ceramic slurry storage tank and a position adjustment mechanism. The ceramic slurry coating head is installed on the bracket through the position adjustment mechanism, and the screw pump transports the ceramic slurry in the ceramic slurry storage tank to the ceramic slurry coating head through a pipeline.

2. The lithium-ion battery ceramic slurry coating mechanism according to claim 1, characterized in that: The position adjustment mechanism includes a guide rod, a slider and a support block. The support blocks are two and are fixed on both sides of the bracket respectively. The guide rod is fixed between the two support blocks. The slider is slidably connected to the guide rod, and the ceramic slurry coating head is installed on the slider.

3. The lithium-ion battery ceramic slurry coating mechanism according to claim 2, characterized in that: A guide rail is provided on the side of the sliding block in the vertical direction, a sliding rod on the guide rail is connected with a clamping block, and the ceramic slurry coating head is installed on the clamping block.

4. The lithium-ion battery ceramic slurry coating mechanism according to claim 3, characterized in that: The sliding blocks are in two sets, and two sets of the ceramic slurry coating heads are correspondingly mounted on the sliding blocks.

5. The lithium-ion battery ceramic slurry coating mechanism according to claim 4, characterized in that: The clamping block and the sliding block are respectively provided with tightening switches.

6. A lithium-ion battery ceramic slurry drying mechanism, characterized in that: It is installed in the positive electrode coating system, including a left gantry, a right gantry, a lamp tube and a lamp tube adjustment mechanism for adjusting the position of the lamp tube. A set of lamp tube adjustment mechanism is installed on each of the left gantry and the right gantry, and the lamp tube is installed between the left gantry and the right gantry through the lamp tube adjustment mechanism.

7. The lithium-ion battery ceramic slurry drying mechanism according to claim 6, characterized in that: The lamp tube adjustment mechanism includes a left connecting block, a right connecting block, a left slider, a right slider and a connecting shaft. The left connecting block and the right connecting block are respectively installed on the corresponding left gantry and right gantry. The connecting shaft is fixed between the left connecting block and the right connecting block. The left slider and the right slider are respectively slidably connected to the connecting shaft. The two ends of the two groups of lamp tubes are respectively installed on the left slider and the right slider on the same side.

8. The lithium-ion battery ceramic slurry drying mechanism according to claim 7, characterized in that: A lampshade is installed on the upper part of the lamp tube.

9. The lithium-ion battery ceramic slurry drying mechanism according to claim 8, characterized in that: The left slider and the right slider are respectively provided with sliding grooves in the vertical direction, and the two ends of the lamp tube and the lampshade are slidably connected with the sliding grooves through sliding sheets.

10. A lithium-ion battery positive electrode coating system, characterized in that: It comprises the lithium-ion battery ceramic slurry coating mechanism described in any one of claims 1 to 5, the lithium-ion battery ceramic slurry drying mechanism described in any one of claims 6 to 9, a reel, a positive electrode slurry spraying die, an oven and a reel.

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